init

vllm_vacc/vllm/_custom_ops.py

@@ -0,0 +1,95 @@
+
+import contextlib
+import importlib
+from typing import TYPE_CHECKING, List, Optional, Tuple, Union
+import torch
+import torch
+import torch.library
+
+import vllm.envs as envs
+from vllm.logger import init_logger
+from vllm.scalar_type import ScalarType
+
+def cutlass_scaled_mm_vacc(a: torch.Tensor,
+                      b: torch.Tensor,
+                      scale_a: torch.Tensor,
+                      scale_b: torch.Tensor,
+                      out_dtype: torch.dtype,
+                      bias: Optional[torch.Tensor] = None) -> torch.Tensor:
+    """
+    `cutlass_scaled_mm` implements a fused version of 
+        `output = torch.mm((scale_a * a), (scale_b * b)).to(out_dtype)`
+    where scale_a * a and scale_b * b are implemented using numpy-style 
+    broadcasting. 
+    
+    In order to support blockwise scaling like found in DeepSeek V3 we also 
+    support extended "group" broadcast rules. We extend the numpy-style 
+    broadcasting rules with the following rule: 
+        "if the extent of a dimension in the source shape is between 1 and 
+        corresponding extent in the target shape we repeat each element along 
+        that dimension  src_shape[dim] // target_shape[dim] times consecutively"
+    example if we have:
+          a = [[1, 2], and target_shape = (2, 4)
+               [3, 4]]
+    then we would expand a to:
+          a = [[1, 1, 2, 2],
+               [3, 3, 4, 4]]
+    currently we only support the case:
+        scale_a.shape * [1, 128] == a.shape
+        scale_b.shape * [128, 128] == b.shape
+    """
+    assert (b.shape[0] % 16 == 0 and b.shape[1] % 16 == 0)
+    assert (out_dtype is torch.bfloat16 or out_dtype is torch.float16)
+    assert bias is None or bias.shape[0] == b.shape[
+        1] and bias.dtype == out_dtype
+
+    m = a.shape[0]
+    n = b.shape[1]
+
+    if current_platform.is_rocm():
+        triton_scaled_mm_module = importlib.import_module(
+            "vllm.model_executor.layers.quantization.compressed_tensors."
+            "triton_scaled_mm")
+        triton_scaled_mm = triton_scaled_mm_module.triton_scaled_mm
+        return triton_scaled_mm(a, b, scale_a, scale_b, out_dtype, bias)
+
+    out = torch.empty((m, n), dtype=out_dtype, device=a.device)
+    # print('a',a.shape,a.dtype) # torch.Size([8192, 3584])  torch.float8_e4m3fn
+    # print('scale_a',scale_a.shape) #torch.Size([8192, 56])
+    # print('b',b.shape,b.dtype) # torch.Size([3584, 1536]) torch.float8_e4m3fn
+    # print('scale_b',scale_b.shape) #torch.Size([56, 12])
+    
+    use_a32_w32 = True #反量化到fp32 计算 matmul
+    
+    if use_a32_w32 or (b.shape[1]//scale_b.shape[1] != 128 or 
+                       a.shape[1]//scale_a.shape[1] != 128 or 
+                       b.shape[0]//scale_b.shape[0] != 128):
+        # cutlass_scaled_mm 不支持非128的 quant block
+        a1 = a.to(torch.float32).reshape(a.shape[0], scale_a.shape[1], -1)
+        scale_a = scale_a.reshape(scale_a.shape[0], scale_a.shape[1], 1).to(torch.float32)
+        a = (a1*scale_a).reshape(a.shape).contiguous()
+        
+        b1 = b.to(torch.float32).reshape(scale_b.shape[0], b.shape[0]//scale_b.shape[0], scale_b.shape[1], b.shape[1]//scale_b.shape[1])
+        scale_b = scale_b.reshape(scale_b.shape[0], 1, scale_b.shape[1], 1).to(torch.float32)
+        b = (b1*scale_b).reshape(b.shape).contiguous()
+
+        out = a@b         
+        if bias is not None:
+            out = out + bias
+        return out.to(out_dtype)
+
+    torch.ops._C.cutlass_scaled_mm(out, a, b, scale_a, scale_b, bias)
+
+    return out
+	
+
+def concat_and_cache_mla(
+    kv_c: torch.Tensor,
+    k_pe: torch.Tensor,
+    kv_cache: torch.Tensor,
+    slot_mapping: torch.Tensor,
+    kv_cache_dtype: str,
+    scale: torch.Tensor,
+) -> None:
+    torch.vacc.concat_and_cache_attention(
+        kv_c, k_pe, kv_cache, slot_mapping)

vllm_vacc/vllm/attention/backends/mla/common.py

@@ -0,0 +1,202 @@
+
+import functools
+from typing import (TYPE_CHECKING, Any, Dict, Generic, List, Optional, Tuple,
+                    Type, TypeVar)
+import torch
+
+from vllm import _custom_ops as ops
+from vllm.attention.backends.abstract import AttentionLayer
+from vllm.attention.backends.abstract import (AttentionBackend, AttentionLayer,
+                                              AttentionMetadata,
+                                              AttentionMetadataBuilder,
+                                              AttentionState, MLAAttentionImpl)
+from vllm.attention.backends.mla.common import MLACommonMetadata,triton_attention
+
+
+from vllm.model_executor.layers.linear import (ColumnParallelLinear,
+                                               LinearBase, RowParallelLinear,
+                                               UnquantizedLinearMethod)
+from vllm.attention.utils.fa_utils import get_flash_attn_version
+
+from vllm.model_executor.layers.rotary_embedding import (
+    DeepseekScalingRotaryEmbedding, RotaryEmbedding)
+from vllm.platforms import current_platform
+
+
+try:
+    from vllm.vllm_flash_attn import flash_attn_varlen_func
+    is_vllm_fa = True
+except ImportError:
+    is_vllm_fa = False
+    try:
+        # For rocm use upstream flash attention
+        from vllm.attention.backends.flash_attn import flash_attn_varlen_func
+    except ImportError:
+        flash_attn_varlen_func = None
+        
+T = TypeVar("T", bound="MLACommonMetadata")
+
+
+class MLACommonImpl():
+    def __init__(
+        self,
+        num_heads: int,
+        head_size: int,
+        scale: float,
+        num_kv_heads: int,
+        alibi_slopes: Optional[List[float]],
+        sliding_window: Optional[int],
+        kv_cache_dtype: str,
+        # blocksparse_params: Optional[Dict[str, Any]],
+        logits_soft_cap: Optional[float],
+        attn_type: str,
+        kv_sharing_target_layer_name: Optional[str],
+        # MLA Specific Arguments
+        q_lora_rank: Optional[int],
+        kv_lora_rank: int,
+        qk_nope_head_dim: int,
+        qk_rope_head_dim: int,
+        qk_head_dim: int,
+        v_head_dim: int,
+        rotary_emb: RotaryEmbedding,
+        # q_proj should be q_b_proj if q_lora_rank is not None, but from an
+        # attention backend perspective we rely on the layer to pass in the
+        # correct matrix
+        q_proj: ColumnParallelLinear,
+        kv_b_proj: ColumnParallelLinear,
+        o_proj: RowParallelLinear,
+        positions: torch.Tensor = None,
+    ) -> None:
+        self.num_heads = num_heads
+        self.head_size = head_size
+        self.scale = float(scale)
+        self.num_kv_heads = num_kv_heads
+        self.kv_cache_dtype = kv_cache_dtype
+
+        self.q_lora_rank = q_lora_rank
+        self.kv_lora_rank = kv_lora_rank
+        self.qk_nope_head_dim = qk_nope_head_dim
+        self.qk_rope_head_dim = qk_rope_head_dim
+        self.qk_head_dim = qk_head_dim
+        self.v_head_dim = v_head_dim
+
+        self.rotary_emb = rotary_emb
+        self.use_yarn_rope = isinstance(rotary_emb,
+                                        DeepseekScalingRotaryEmbedding)
+        self.q_proj = q_proj
+        self.kv_b_proj = kv_b_proj
+        self.o_proj = o_proj
+        self.positions = positions
+
+        self.triton_fa_func = triton_attention
+        # Handle the differences between the flash_attn_varlen from flash_attn
+        # and the one from vllm_flash_attn. The former is used on RoCM and the
+        # latter has an additional parameter to control FA2 vs FA3
+        self.flash_attn_varlen_func = flash_attn_varlen_func
+        self.vllm_flash_attn_version = get_flash_attn_version()
+        if self.vllm_flash_attn_version is not None:
+            self.flash_attn_varlen_func = \
+                functools.partial(flash_attn_varlen_func,
+                                  fa_version=self.vllm_flash_attn_version)
+
+        # For MLA the v head dim is smaller than qk head dim so we pad out
+        # v with 0s to match the qk head dim for attention backends that do
+        # not support different headdims
+        # We don't need to pad V if we are on a hopper system with FA3
+        self._pad_v = self.vllm_flash_attn_version is None or not (
+            self.vllm_flash_attn_version == 3
+            and current_platform.get_device_capability()[0] == 9)
+        
+    def forward(
+        self,
+        layer: AttentionLayer,
+        hidden_states_or_q_c: torch.Tensor,  # query in unified attn
+        k_c_normed: torch.Tensor,  # key in unified attn
+        k_pe: torch.Tensor,  # value in unified attn
+        kv_cache: torch.Tensor,
+        attn_metadata: T,
+        output: Optional[torch.Tensor] = None,
+    ) -> torch.Tensor:
+        if output is not None:
+            raise NotImplementedError(
+                "output is not yet supported for MLAImplBase")
+
+        # if attn_metadata.is_profile_run and \
+        #     attn_metadata.context_chunk_workspace is not None:
+        #     # During the profile run try to simulate to worse case output size
+        #     # for `self.kv_b_proj(kv_c_normed)` in `_compute_prefill_context`
+        #     # since this can be large
+        #     _ = torch.empty(
+        #         (attn_metadata.context_chunk_workspace.shape[0],
+        #          self.num_heads, self.qk_nope_head_dim + self.v_head_dim),
+        #         device=k_c_normed.device,
+        #         dtype=k_c_normed.dtype,
+        #     )
+
+        has_decode = attn_metadata.decode_metadata is not None
+        has_prefill = attn_metadata.prefill_metadata is not None
+
+        # Restore head dim (for rotary embedding)
+        k_pe = k_pe.unsqueeze(1)
+        # assert hasattr(attn_metadata, "input_positions")
+        if self.positions is not None:
+            positions = self.positions 
+        elif hasattr(attn_metadata, "input_positions"):
+            positions = attn_metadata.input_positions
+        else:
+            raise ValueError('no positions') 
+            
+
+        num_prefill_tokens: int = attn_metadata.num_prefill_tokens
+
+        decode_hs_or_q_c = hidden_states_or_q_c[num_prefill_tokens:]
+        decode_k_pe = k_pe[num_prefill_tokens:]
+        decode_input_positions = \
+            positions[num_prefill_tokens:]
+
+        prefill_hs_or_q_c = hidden_states_or_q_c[:num_prefill_tokens]
+        prefill_k_pe = k_pe[:num_prefill_tokens]
+        prefill_input_positions = \
+            positions[:num_prefill_tokens]
+        prefill_k_c_normed = k_c_normed[:num_prefill_tokens]
+
+        if has_decode:
+            decode_ql_nope, decode_q_pe = \
+                self._q_proj_and_k_up_proj(decode_hs_or_q_c)
+            decode_q_pe[...], decode_k_pe[...] = self.rotary_emb(
+                decode_input_positions, decode_q_pe, decode_k_pe)
+
+        if has_prefill:
+            prefill_q = self.q_proj(prefill_hs_or_q_c)[0]\
+                .view(-1, self.num_heads, self.qk_head_dim)
+            prefill_q_pe = prefill_q[..., self.qk_nope_head_dim:]
+            prefill_q_pe[...], prefill_k_pe[...] = self.rotary_emb(
+                prefill_input_positions, prefill_q_pe, prefill_k_pe)
+
+        # write the latent and rope to kv cache
+        if kv_cache.numel() > 0:
+            ops.concat_and_cache_mla(
+                k_c_normed,
+                k_pe.squeeze(1),
+                kv_cache,
+                attn_metadata.slot_mapping.flatten(),
+                kv_cache_dtype=self.kv_cache_dtype,
+                scale=layer._k_scale,
+            )
+
+        # output = torch.empty(attn_metadata.num_prefill_tokens +
+        #                      attn_metadata.num_decode_tokens,
+        #                      self.o_proj.output_size,
+        #                      device=hidden_states_or_q_c.device,
+        #                      dtype=hidden_states_or_q_c.dtype)
+        if has_prefill:
+            return self._forward_prefill(
+                prefill_q, prefill_k_c_normed, prefill_k_pe, kv_cache,
+                attn_metadata)
+
+        if has_decode:
+            return self._forward_decode(
+                decode_ql_nope, decode_q_pe, kv_cache, attn_metadata)
+
+        assert False, "mla forward need prefill or decode function"
+        return None

vllm_vacc/vllm/attention/backends/mla/utils.py

@@ -0,0 +1,390 @@
+from abc import abstractmethod
+from dataclasses import dataclass
+from typing import Any, Dict, Generic, List, Optional, Tuple
+
+import torch
+from compressed_tensors.quantization import QuantizationStrategy
+
+from vllm import _custom_ops as ops
+from vllm import envs
+from vllm.attention.backends.abstract import (AttentionLayer,
+                                              AttentionMetadata,
+                                              MLAAttentionImpl, T)
+from vllm.distributed import (get_tensor_model_parallel_world_size,
+                              tensor_model_parallel_all_reduce)
+from vllm.model_executor.layers.linear import (ColumnParallelLinear,
+                                               LinearBase, RowParallelLinear,
+                                               UnquantizedLinearMethod)
+from vllm.model_executor.layers.quantization.compressed_tensors.compressed_tensors import (  # noqa: E501
+    CompressedTensorsLinearMethod)
+from vllm.model_executor.layers.quantization.compressed_tensors.schemes import (
+    CompressedTensorsW8A8Fp8)
+from vllm.model_executor.layers.quantization.fp8 import Fp8LinearMethod
+# from vllm.model_executor.layers.quantization.utils.fp8_utils import (
+#     apply_fp8_linear_generic, current_platform_fp8_dtype, is_fp8)
+from vllm.model_executor.layers.quantization.utils.quant_utils import (
+    scaled_dequantize, scaled_quantize)
+import os
+
+W_Q_W_QR_WUV_WUK_USE_FP8 = True
+
+class MLACommonImpl(MLAAttentionImpl[T], Generic[T]):
+    def process_weights_after_loading(self, act_dtype: torch.dtype):
+
+        def is_layer_fp8(layer: LinearBase) -> bool:
+            return isinstance(layer.quant_method, Fp8LinearMethod) or\
+                (isinstance(layer.quant_method, CompressedTensorsLinearMethod)\
+                and isinstance(layer.scheme, CompressedTensorsW8A8Fp8))
+
+        def quantization_scheme_supported(layer: LinearBase) -> bool:
+            return isinstance(layer.quant_method, UnquantizedLinearMethod) or \
+                is_layer_fp8(layer)
+
+        # TODO(lucas) This is very gross, we need a more wide scale refactor of
+        # all the FP8 code with a more standard way of
+        # defining schemes/group-shapes, we should also potentially force
+        # quant_methods to support a decompress function
+        #
+        # returns input_group_shape, weight_group_shape
+        def get_scale_group_shapes_for_fp8(layer: LinearBase) -> \
+            Tuple[Tuple[int, int], Tuple[int, int]]:
+            if isinstance(layer.quant_method, Fp8LinearMethod):
+                if layer.quant_method.block_quant is not None:
+                    weight_block_size = \
+                        layer.quant_method.quant_config.weight_block_size
+                    # per-token-group (1, X), block-quantized (X, Y)
+                    return (1, weight_block_size[-1]), weight_block_size
+                else:
+                    return (-1, -1), (-1, -1)  # per-tensor, per-tensor
+            elif isinstance(layer.quant_method, CompressedTensorsLinearMethod)\
+                and isinstance(layer.scheme, CompressedTensorsW8A8Fp8):
+                # this is hacky but we always assume the for
+                # CompressedTensorsW8A8Fp8 the input is dynamic per-token
+                # we ignore if it is static-per-tensor since we are going to
+                # requantize after later anyways
+                strategy = layer.scheme.strategy
+                if strategy == QuantizationStrategy.TENSOR:
+                    return (1, -1), (-1, -1)  # per-token, per-tensor
+                elif strategy == QuantizationStrategy.CHANNEL:
+                    return (1, -1), (-1, 1)  # per-token, per-channel
+                else:
+                    raise NotImplementedError(
+                        f"QuantizationStrategy.{strategy} is not supported for "
+                        "fp8 MLA, please run with VLLM_MLA_DISABLE=1")
+            else:
+                raise NotImplementedError(
+                    "Can't determine scale group shapes for "
+                    f"{layer.quant_method}, please run with VLLM_MLA_DISABLE=1"
+                )
+
+        def get_scales(layer: LinearBase) -> torch.Tensor:
+            if hasattr(layer, "weight_scale_inv"):
+                return layer.weight_scale_inv
+            return layer.weight_scale
+
+        def get_fp8_layer_weight(layer: LinearBase):
+            if is_layer_fp8(layer):
+                if isinstance(layer.quant_method, \
+                    CompressedTensorsLinearMethod) and \
+                    isinstance(layer.scheme, CompressedTensorsW8A8Fp8):
+                    # NOTE(lucas): note sure why but `CompressedTensorsW8A8Fp8`
+                    # seems to store weights as (input, output) instead of
+                    # (output, input) so we need to transpose
+                    weight = layer.weight.T  # standardize to (output, input)
+                else:
+                    weight = layer.weight
+                _, weight_scale_group_shape = \
+                    get_scale_group_shapes_for_fp8(layer)
+                scales = get_scales(layer)  # 已经expand过了
+                weight_scale_group_shape=weight_scale_group_shape.copy() #config中读出来的[128,128], 需要 .copy(), 否则会把config改掉
+                
+                # 重新校准一下 weight_scale_group_shape
+                if weight.shape[0] // scales.shape[0] != weight_scale_group_shape[0]:
+                    weight_scale_group_shape[0] = weight.shape[0] // scales.shape[0]
+                    
+                if weight.shape[1] // scales.shape[1] != weight_scale_group_shape[1]:
+                    weight_scale_group_shape[1] = weight.shape[1] // scales.shape[1]    
+
+                return weight, scales
+            else:
+                return layer.weight, None
+
+        def get_fp8_layer_weight_test(layer: LinearBase):
+            if is_layer_fp8(layer):
+                if isinstance(layer.quant_method, \
+                    CompressedTensorsLinearMethod) and \
+                    isinstance(layer.scheme, CompressedTensorsW8A8Fp8):
+                    # NOTE(lucas): note sure why but `CompressedTensorsW8A8Fp8`
+                    # seems to store weights as (input, output) instead of
+                    # (output, input) so we need to transpose
+                    weight = layer.weight.T  # standardize to (output, input)
+                else:
+                    weight = layer.weight
+                _, weight_scale_group_shape = \
+                    get_scale_group_shapes_for_fp8(layer)
+                scales = get_scales(layer)  # 已经expand过了
+                weight_scale_group_shape=weight_scale_group_shape.copy() #config中读出来的[128,128], 需要 .copy(), 否则会把config改掉
+
+                # 重新校准一下 weight_scale_group_shape
+                if weight.shape[0] // scales.shape[0] != weight_scale_group_shape[0]:
+                    weight_scale_group_shape[0] = weight.shape[0] // scales.shape[0]
+
+                if weight.shape[1] // scales.shape[1] != weight_scale_group_shape[1]:
+                    weight_scale_group_shape[1] = weight.shape[1] // scales.shape[1]
+
+                # for test
+                weight = scaled_dequantize(weight, scales, weight_scale_group_shape)
+                # print(f'{weight.shape}, {scales.shape}, {weight_scale_group_shape}')
+                return weight, scales
+            else:
+                return layer.weight, None
+
+        def check_eq(name, tensor0, tensor1):
+            assert tensor0.shape == tensor1.shape
+            isEqual = torch.equal(tensor0.reshape([-1]).float(), tensor1.reshape([-1]).float())
+            print(f"{os.getpid()} check {name} {tensor0.shape} equal: {isEqual}")
+            return isEqual
+
+        def get_and_maybe_dequant_weights(layer: LinearBase):
+            if is_layer_fp8(layer):
+                if isinstance(layer.quant_method, \
+                    CompressedTensorsLinearMethod) and \
+                    isinstance(layer.scheme, CompressedTensorsW8A8Fp8):
+                    # NOTE(lucas): note sure why but `CompressedTensorsW8A8Fp8`
+                    # seems to store weights as (input, output) instead of
+                    # (output, input) so we need to transpose
+                    weight = layer.weight.T  # standardize to (output, input)
+                else:
+                    weight = layer.weight
+                _, weight_scale_group_shape = \
+                    get_scale_group_shapes_for_fp8(layer)
+                scales = get_scales(layer)  # 已经expand过了
+                weight_scale_group_shape=weight_scale_group_shape.copy() #config中读出来的[128,128], 需要 .copy(), 否则会把config改掉
+                
+                # 重新校准一下 weight_scale_group_shape
+                if weight.shape[0] // scales.shape[0] != weight_scale_group_shape[0]:
+                    weight_scale_group_shape[0] = weight.shape[0] // scales.shape[0]
+                    
+                if weight.shape[1] // scales.shape[1] != weight_scale_group_shape[1]:
+                    weight_scale_group_shape[1] = weight.shape[1] // scales.shape[1]    
+
+                return scaled_dequantize(weight, scales,
+                                         weight_scale_group_shape)
+            else:
+                return layer.weight
+
+        if not (quantization_scheme_supported(self.kv_b_proj) and\
+            quantization_scheme_supported(self.q_proj) and\
+                quantization_scheme_supported(self.o_proj)):
+            raise NotImplementedError(
+                "Only FP8 and UnquantizedLinearMethod are supported for MLA"
+                ", please run with VLLM_MLA_DISABLE=1")
+
+        weight_dtype = self.kv_b_proj.weight.dtype
+        assert self.o_proj.weight.dtype == weight_dtype
+        assert self.q_proj.weight.dtype == weight_dtype
+
+        if W_Q_W_QR_WUV_WUK_USE_FP8: #and not envs.VLLM_MLA_PERFORM_MATRIX_ABSORPTION:
+            # 512,1024(=4x256)
+            kv_b_proj_weight, kv_b_proj_scale = \
+                [t.T for t in get_fp8_layer_weight(self.kv_b_proj)]
+            
+            # kv_b_proj_weight = kv_b_proj_weight.transpose(-1,-2).contiguous().transpose(-1,-2)
+            N, K = kv_b_proj_weight.shape[0], kv_b_proj_weight.shape[1]
+            
+            # 512,1024 => 512,4,256
+            kv_b_proj_weight = kv_b_proj_weight.view(
+                self.kv_lora_rank,
+                self.num_heads,
+                self.qk_nope_head_dim + self.v_head_dim,
+            )
+
+            kv_b_proj_scale = kv_b_proj_scale.view(
+                kv_b_proj_scale.shape[0] * self.kv_lora_rank // N,
+                self.num_heads,
+                kv_b_proj_scale.shape[1] * N // (self.kv_lora_rank * self.num_heads),
+            )
+
+            W_UK, W_UV = kv_b_proj_weight.split(
+                [self.qk_nope_head_dim, self.v_head_dim], dim=-1)
+            W_UK = W_UK.contiguous()
+            
+            scale_0 = kv_b_proj_scale.shape[-1] * self.qk_nope_head_dim // (self.qk_nope_head_dim + self.v_head_dim)
+            scale_1 = kv_b_proj_scale.shape[-1] - scale_0
+            
+            W_UK_scale, W_UV_scale = kv_b_proj_scale.split(
+                [scale_0, scale_1], dim=-1)
+            W_UK_scale = W_UK_scale.view(W_UK_scale.shape[0], -1).unsqueeze(-1).contiguous()
+            W_UV_scale = W_UV_scale.view(W_UV_scale.shape[0], -1).unsqueeze(-1)
+            
+            # weight: [1536, 768] scale: 12,6
+            q_proj_weight, q_proj_scale = \
+                [t.T for t in get_fp8_layer_weight(self.q_proj)]
+                
+            #self.W_Q_QR = q_proj_weight.contiguous().transpose(-2,-1).contiguous().transpose(-2,-1)
+            #self.W_Q_QR_scales = q_proj_scale.reshape(12, 6, 1).repeat(1, 1, 4).reshape(12, -1).contiguous().transpose(-2,-1).contiguous().transpose(-2,-1)
+
+            q_proj_weight = q_proj_weight\
+                .view(-1, self.num_heads, self.qk_head_dim)
+            # w_q[1536, 512] + w_qr[1536, 256]
+            W_Q = q_proj_weight[..., :self.qk_nope_head_dim].flatten(start_dim=1)
+            W_QR = q_proj_weight[..., self.qk_nope_head_dim:]\
+                .flatten(start_dim=1).contiguous()
+            # w_q_scale 12,16 + w_qr_scale 12,8
+            # expand: 12,6(4+2) -> 12,24(16+8)
+            # Q_scale: [s0x4, s1x2, s2x2, s3x4, s4x2, s5x2]
+            repeat_pattern = torch.tensor([4, 2, 2, 4, 2, 2], device=q_proj_scale.device)
+            W_Q_scale = torch.repeat_interleave(q_proj_scale, repeat_pattern, dim=1)
+            # Q_R_scale: [s1x2, s2x2, s4x2, s5x2]
+            selected_indices = [1, 2, 4, 5]
+            repeat_times = 2
+            selected = q_proj_scale[:, selected_indices]
+            W_QR_scale = selected.repeat_interleave(repeat_times, dim=1)
+            
+            # temp_WQ_Scale = W_Q_scale.reshape(12, 4, -1).contiguous()
+            # temp_W_QR_scale = W_QR_scale.reshape(12, 4, -1).contiguous()
+            # temp_scale = torch.cat([temp_WQ_Scale, temp_W_QR_scale], dim=2).contiguous().reshape(12, -1).contiguous().transpose(-2,-1).contiguous().transpose(-2,-1)
+            # self.W_Q_QR_scales = temp_scale
+            # print("W_Q_scale:", W_Q_scale.shape)
+            # print("W_QR_scale:", W_QR_scale.shape)
+            # print("temp_scale:", temp_scale.shape)
+            # exit(0)
+
+            # Note: to be vnnl compatible
+            # 1. expand w_uv scale for core split friendly
+            if W_UV.shape[-1] % 4 == 0:
+                W_UV_scale = W_UV_scale.expand((W_UV_scale.shape[0], W_UV_scale.shape[1], 4))
+            # 2. change w_q, w_qr, w_uv weight&scale to K-contiguous (shape unchanged)
+            W_Q = W_Q.transpose(-2,-1).contiguous().transpose(-2,-1)
+            W_Q_scale = W_Q_scale.transpose(-2,-1).contiguous().transpose(-2,-1)
+            W_QR = W_QR.transpose(-2,-1).contiguous().transpose(-2,-1)
+            W_QR_scale = W_QR_scale.transpose(-2,-1).contiguous().transpose(-2,-1)
+
+            W_UV = W_UV.permute(2,1,0).contiguous().permute(2,1,0)
+            W_UV_scale = W_UV_scale.permute(2,1,0).contiguous().permute(2,1,0)
+
+            self.W_Q = W_Q
+            self.W_Q_scales = W_Q_scale
+
+            self.W_QR = W_QR
+            self.W_QR_scales = W_QR_scale
+
+            # temp_Q_scale = self.W_Q_scales.contiguous()
+            # temp_W_QR_scale = self.W_QR_scales.contiguous()
+            # self.W_Q_QR = q_proj_weight.reshape(1536, -1).contiguous().transpose(-2,-1).contiguous().transpose(-2,-1)
+            # self.W_Q_QR_scales = torch.concat([temp_Q_scale,temp_W_QR_scale],dim=1).contiguous().transpose(-2,-1).contiguous().transpose(-2,-1)
+            #self.W_Q_QR = torch.concat([self.W_Q.contiguous(),self.W_QR.contiguous()],dim=1).contiguous().transpose(-2,-1).contiguous().transpose(-2,-1)
+            #self.W_Q_QR_scales = torch.concat([W_Q_scale,W_QR_scale],dim=1).contiguous().transpose(-2,-1).contiguous().transpose(-2,-1)
+
+            self.W_UV = W_UV
+            self.W_UV_scales = W_UV_scale
+
+            self.W_UK = W_UK
+            self.W_UK_scales = W_UK_scale
+            return
+
+        kv_b_proj_weight = get_and_maybe_dequant_weights(self.kv_b_proj).T
+        assert kv_b_proj_weight.shape == (
+            self.kv_lora_rank,
+            self.num_heads * (self.qk_nope_head_dim + self.v_head_dim)), (
+                f"{kv_b_proj_weight.shape=}, "
+                f"{self.kv_lora_rank=}, "
+                f"{self.num_heads=}, "
+                f"{self.qk_nope_head_dim=}, "
+                f"{self.v_head_dim=}")
+        kv_b_proj_weight = kv_b_proj_weight.view(
+            self.kv_lora_rank,
+            self.num_heads,
+            self.qk_nope_head_dim + self.v_head_dim,
+        )
+
+        W_UK, W_UV = kv_b_proj_weight.split(
+            [self.qk_nope_head_dim, self.v_head_dim], dim=-1)
+
+        q_proj_weight = get_and_maybe_dequant_weights(self.q_proj).T\
+                .view(-1, self.num_heads, self.qk_head_dim)
+
+        # can be W_Q or W_UQ depending q_lora_rank, the former if
+        # q_lora_rank is None, the latter otherwise. From the Attention backend
+        # perspective though we call these both W_Q and rely on the layer
+        # to pass in the correct matrix
+        W_Q = q_proj_weight[..., :self.qk_nope_head_dim]
+        self.W_QR = q_proj_weight[..., self.qk_nope_head_dim:]\
+            .flatten(start_dim=1).contiguous()
+
+        # W_QR is small so for simplicity we dont bother requantizing it
+        self.W_QR = self.W_QR.to(act_dtype)
+
+        if envs.VLLM_MLA_PERFORM_MATRIX_ABSORPTION:
+            assert False, "please set VLLM_MLA_PERFORM_MATRIX_ABSORPTION=0"
+            requantization_enabled = not envs.VLLM_MLA_DISABLE_REQUANTIZATION
+            if is_fp8(weight_dtype) and requantization_enabled:
+                # This assumes it wise to requantize using the same group shapes
+                # (i.e. strategy, per-tensor, per-channel, block etc.) that the
+                # weights were originally quantized
+                requant_input_group_shape, requant_weight_group_shape = \
+                    get_scale_group_shapes_for_fp8(self.q_proj)
+                assert (requant_input_group_shape, requant_weight_group_shape)\
+                    == get_scale_group_shapes_for_fp8(self.kv_b_proj)
+                assert (requant_input_group_shape, requant_weight_group_shape)\
+                    == get_scale_group_shapes_for_fp8(self.o_proj)
+                self.reqaunt_input_group_shape = requant_input_group_shape
+                self.reqaunt_weight_group_shape = requant_weight_group_shape
+
+            #
+            # Perform matrix-absorption following
+            #     https://github.com/flashinfer-ai/flashinfer/pull/551
+            # for decode, as a result we end up with absorbed weights for decode
+            # and another copy of raw weights for prefill.
+            #
+            self.W_UK, self.W_UV = kv_b_proj_weight.split(
+                [self.qk_nope_head_dim, self.v_head_dim], dim=-1)
+            # We absorb `W_UK` into `W_Q` resulting in either W_Q_UK or W_UQ_UK
+            # depending q_lora_rank, the former if q_lora_rank is None, the
+            # latter otherwise
+            # basically if q_lora_rank is none we are absorbing into q_proj
+            # instead of UQ
+            W_Q_UK = torch.einsum("qnd,lnd -> qnl", W_Q, W_UK)\
+                .flatten(start_dim=1).contiguous()
+
+            if is_fp8(weight_dtype) and requantization_enabled:
+                W_Q_UK, W_Q_UK_scales = scaled_quantize(
+                    W_Q_UK,
+                    self.reqaunt_weight_group_shape,
+                    quant_dtype=current_platform_fp8_dtype)
+                # For FP8 save the transpose so we can use
+                # `apply_w8a8_block_fp8_linear` directly
+                self.W_Q_UK = W_Q_UK.T.contiguous()
+                self.W_Q_UK_scales = W_Q_UK_scales.T.contiguous()
+            else:
+                self.W_Q_UK = W_Q_UK.to(act_dtype)
+
+            W_O = get_and_maybe_dequant_weights(self.o_proj)\
+                .view(-1, self.num_heads, self.v_head_dim)
+            W_UV_O = torch.einsum("lnd,hnd -> nlh", W_UV, W_O)\
+                .flatten(start_dim=0, end_dim=1).contiguous()
+
+            if is_fp8(weight_dtype) and requantization_enabled:
+                W_UV_O, W_UV_O_scales = scaled_quantize(
+                    W_UV_O,
+                    self.reqaunt_weight_group_shape,
+                    quant_dtype=current_platform_fp8_dtype)
+                # For FP8 save the transpose so we can use
+                # `apply_w8a8_block_fp8_linear` directly
+                self.W_UV_O = W_UV_O.T.contiguous()
+                self.W_UV_O_scales = W_UV_O_scales.T.contiguous()
+            else:
+                self.W_UV_O = W_UV_O.to(act_dtype)
+
+            self.tp_size = get_tensor_model_parallel_world_size()
+        else:
+            # print('W_UV', W_UV.dtype) #float32
+            #if is_fp8(weight_dtype):
+            #    raise NotImplementedError(
+            #        "Currently fp8 requires matrix absorption")
+            # self.W_UV = W_UV
+            # self.W_UK = W_UK
+            self.W_UV = W_UV.to(act_dtype) # fp32 to bfp16
+            self.W_UK = W_UK.to(act_dtype)
+            W_Q = W_Q.to(act_dtype)
+            self.W_Q = W_Q.flatten(start_dim=1)

vllm_vacc/vllm/attention/backends/vacc_attn.py

@@ -0,0 +1,726 @@
+""" Attention layer with torch scaled_dot_product_attention
+    and PagedAttention."""
+from dataclasses import dataclass
+from typing import Any, Dict, List, Optional, Tuple, Type
+
+import torch
+from torch.nn.functional import scaled_dot_product_attention
+
+from vllm.attention.backends.abstract import (AttentionBackend, AttentionImpl,
+                                              AttentionMetadata, AttentionType)
+# from vllm.attention.backends.utils import CommonAttentionState
+# from vllm.attention.ops.paged_attn import PagedAttentionMetadata
+
+from vllm_vacc.vllm.attention.ops.vacc_paged_attn import VaccPagedAttention as PagedAttention
+
+# from vllm.attention.backends.abstract import (AttentionBackend, AttentionImpl,
+#                                               AttentionLayer,
+#                                               AttentionMetadata,
+#                                               AttentionMetadataBuilder,
+#                                               AttentionType)
+# from vllm.attention.backends.utils import CommonAttentionState
+# from vllm.attention.ops.ipex_attn import PagedAttention
+from vllm.attention.ops.paged_attn import PagedAttentionMetadata
+from vllm.logger import init_logger
+from vllm.utils import make_tensor_with_pad
+from vllm_vacc.vllm.v1.worker.vacc_model_runner import ModelInputForVACCBuilder
+
+logger = init_logger(__name__)
+
+import os
+from vllm_vacc.vllm.model_executor.models.vars import BLOCK_GROUP_SIZE as env_blk_grp_size
+
+class VACCAttentionBackend(AttentionBackend):
+
+    @staticmethod
+    def get_name() -> str:
+        return "TORCH_VACC"
+    @staticmethod
+    def get_impl_cls() -> Type["VACCAttentionBackendImpl"]:
+        return VACCAttentionBackendImpl
+
+    @staticmethod
+    def get_metadata_cls() -> Type["AttentionMetadata"]:
+        return VACCAttentionMetadata
+
+    @staticmethod
+    def get_state_cls() -> Type["CommonAttentionState"]:
+        return CommonAttentionState
+    
+    @staticmethod
+    def get_builder_cls() -> Type["VACCMetadataBuilder"]:
+        return VACCMetadataBuilder
+
+    @staticmethod
+    def get_kv_cache_shape(
+        num_blocks: int,
+        block_size: int,
+        num_kv_heads: int,
+        head_size: int,
+    ) -> Tuple[int, ...]:
+        return PagedAttention.get_kv_cache_shape(num_blocks, block_size,
+                                                 num_kv_heads, head_size)
+
+    @staticmethod
+    def swap_blocks(
+        src_kv_cache: torch.Tensor,
+        dst_kv_cache: torch.Tensor,
+        src_to_dst: torch.Tensor,
+    ) -> None:
+        PagedAttention.swap_blocks(src_kv_cache, dst_kv_cache, src_to_dst)
+
+    @staticmethod
+    def copy_blocks(
+        kv_caches: List[torch.Tensor],
+        src_to_dists: torch.Tensor,
+    ) -> None:
+        PagedAttention.copy_blocks(kv_caches, src_to_dists)
+
+
+@dataclass
+class VACCAttentionMetadata(AttentionMetadata, PagedAttentionMetadata):
+    """Metadata for VACCAttentionMetadata.
+    """
+    # Currently, input sequences can only contain all prompts
+    # or all decoding. True if all sequences are prompts.
+    chunked_prefill: bool
+    seq_lens: Optional[List[int]] = None  # For non-chunked prefill
+    # For chunked prefill only
+    max_query_len: Optional[int] = None
+    max_kv_len: Optional[int] = None
+    query_start_loc: Optional[torch.Tensor] = None
+    kv_start_loc: Optional[torch.Tensor] = None
+    prefill_block_tables: Optional[torch.Tensor] = None
+
+    # Begin encoder attn & enc/dec cross-attn fields...
+    # Encoder sequence lengths representation
+    encoder_seq_lens: Optional[List[int]] = None
+    encoder_seq_lens_tensor: Optional[torch.Tensor] = None
+
+    # Maximum sequence length among encoder sequences
+    max_encoder_seq_len: Optional[int] = None
+
+    # Number of tokens input to encoder
+    num_encoder_tokens: Optional[int] = None
+
+    # Cross-attention memory-mapping data structures: slot mapping
+    # and block tables
+    cross_slot_mapping: Optional[torch.Tensor] = None
+    cross_block_tables: Optional[torch.Tensor] = None
+
+    def __post_init__(self):
+        # Set during the execution of the first attention op.
+        # It is a list because it is needed to set per prompt
+        # when alibi slopes is used. It is because of the limitation
+        # from xformer API.
+        # will not appear in the __repr__ and __init__
+        self.attn_bias: Optional[List[torch.Tensor]] = None
+        self.encoder_attn_bias: Optional[List[torch.Tensor]] = None
+        self.cross_attn_bias: Optional[List[torch.Tensor]] = None
+
+    @property
+    def is_all_encoder_attn_metadata_set(self):
+        '''
+        All attention metadata required for encoder attention is set.
+        '''
+        return ((self.encoder_seq_lens is not None)
+                and (self.encoder_seq_lens_tensor is not None)
+                and (self.max_encoder_seq_len is not None))
+
+    @property
+    def is_all_cross_attn_metadata_set(self):
+        '''
+        All attention metadata required for enc/dec cross-attention is set.
+
+        Superset of encoder attention required metadata.
+        '''
+        return (self.is_all_encoder_attn_metadata_set
+                and (self.cross_slot_mapping is not None)
+                and (self.cross_block_tables is not None))
+
+    @property
+    def prefill_metadata(self) -> Optional["VACCAttentionMetadata"]:
+        # Currently chunked prefill is not supported
+        if self.num_prefill_tokens == 0:
+            return None
+        return self
+
+    @property
+    def decode_metadata(self) -> Optional["VACCAttentionMetadata"]:
+        # Currently chunked prefill is not supported
+        if self.num_decode_tokens == 0:
+            return None
+        return self
+
+    def get_seq_lens(
+        self,
+        attn_type: AttentionType,
+    ):
+        '''
+        Extract appropriate sequence lengths from attention metadata
+        according to attention type.
+
+        Arguments:
+
+        * attn_metadata: Attention metadata structure associated with attention
+        * attn_type: encoder attention, decoder self-attention,
+                    encoder/decoder cross-attention
+
+        Returns:
+        * Appropriate sequence lengths tensor for query
+        * Appropriate sequence lengths tensor for key & value
+        '''
+
+        if (attn_type == AttentionType.DECODER
+                or attn_type == AttentionType.ENCODER_ONLY):
+            seq_lens_q = self.seq_lens
+            seq_lens_kv = self.seq_lens
+        elif attn_type == AttentionType.ENCODER:
+            seq_lens_q = self.encoder_seq_lens
+            seq_lens_kv = self.encoder_seq_lens
+        elif attn_type == AttentionType.ENCODER_DECODER:
+            seq_lens_q = self.seq_lens
+            seq_lens_kv = self.encoder_seq_lens
+        else:
+            raise AttributeError(f"Invalid attention type {str(attn_type)}")
+        return seq_lens_q, seq_lens_kv
+
+    def get_attn_bias(
+        self,
+        attn_type: AttentionType,
+    ) -> Optional[List[torch.Tensor]]:
+        '''
+        Extract appropriate attention bias from attention metadata
+        according to attention type.
+
+        Arguments:
+
+        * attn_metadata: Attention metadata structure associated with attention
+        * attn_type: encoder attention, decoder self-attention,
+                    encoder/decoder cross-attention
+
+        Returns:
+        * Appropriate attention bias value given the attention type
+        '''
+
+        if (attn_type == AttentionType.DECODER
+                or attn_type == AttentionType.ENCODER_ONLY):
+            return self.attn_bias
+        elif attn_type == AttentionType.ENCODER:
+            return self.encoder_attn_bias
+        elif attn_type == AttentionType.ENCODER_DECODER:
+            return self.cross_attn_bias
+        else:
+            raise AttributeError(f"Invalid attention type {str(attn_type)}")
+
+    def set_attn_bias(
+        self,
+        attn_bias: List[torch.Tensor],
+        attn_type: AttentionType,
+    ) -> None:
+        '''
+        Update appropriate attention bias field of attention metadata,
+        according to attention type.
+
+        Arguments:
+
+        * attn_metadata: Attention metadata structure associated with attention
+        * attn_bias: The desired attention bias value
+        * attn_type: encoder attention, decoder self-attention,
+                    encoder/decoder cross-attention
+        '''
+
+        if (attn_type == AttentionType.DECODER
+                or attn_type == AttentionType.ENCODER_ONLY):
+            self.attn_bias = attn_bias
+        elif attn_type == AttentionType.ENCODER:
+            self.encoder_attn_bias = attn_bias
+        elif attn_type == AttentionType.ENCODER_DECODER:
+            self.cross_attn_bias = attn_bias
+        else:
+            raise AttributeError(f"Invalid attention type {str(attn_type)}")
+
+    def get_seq_len_block_table_args(
+        self,
+        attn_type: str,
+    ) -> tuple:
+        '''
+        The particular choice of sequence-length- and block-table-related
+        attributes which should be extracted from attn_metadata is dependent
+        on the type of attention operation.
+
+        Decoder attn -> select entirely decoder self-attention-related fields
+        Encoder/decoder cross-attn -> select encoder sequence lengths &
+                                    cross-attn block-tables fields
+        Encoder attn -> select encoder sequence lengths fields & no block tables
+
+        Arguments:
+
+        * attn_metadata: Attention metadata structure associated with attention
+        * is_prompt: True if prefill, False otherwise
+        * attn_type: encoder attention, decoder self-attention,
+                    encoder/decoder cross-attention
+
+        Returns:
+
+        * Appropriate sequence-lengths tensor
+        * Appropriate max sequence-length scalar
+        * Appropriate block tables (or None)
+        '''
+
+        if (attn_type == AttentionType.DECODER
+                or attn_type == AttentionType.ENCODER_ONLY):
+            # Decoder self-attention
+            # Choose max_seq_len based on whether we are in prompt_run
+            return (self.seq_lens_tensor, self.max_decode_seq_len,
+                    self.block_tables)
+        elif attn_type == AttentionType.ENCODER_DECODER:
+            # Enc/dec cross-attention KVs match encoder sequence length;
+            # cross-attention utilizes special "cross" block tables
+            return (self.encoder_seq_lens_tensor, self.max_encoder_seq_len,
+                    self.cross_block_tables)
+        elif attn_type == AttentionType.ENCODER:
+            # No block tables associated with encoder attention
+            return (self.encoder_seq_lens_tensor, self.max_encoder_seq_len,
+                    None)
+        else:
+            raise AttributeError(f"Invalid attention type {str(attn_type)}")
+
+class VACCMetadataBuilder(AttentionMetadataBuilder[VACCAttentionMetadata]):
+
+    def __init__(self, input_builder: ModelInputForVACCBuilder) -> None:
+        self.chunked_prefill = input_builder.chunked_prefill
+        self.input_builder = input_builder
+
+    def prepare(self):
+        self.input_data = self.input_builder.input_data
+
+    def build(self, seq_lens: List[int], query_lens: List[int],
+              cuda_graph_pad_size: int, batch_size: int) -> VACCAttentionMetadata:
+        input_data = self.input_data
+        prefill_seq_lens = seq_lens[0:input_data.num_prefills]
+        prefill_query_lens = query_lens[0:input_data.num_prefills]
+        slot_mapping = torch.tensor(input_data.slot_mapping,
+                                    dtype=torch.int32,
+                                    device=self.input_builder.device)
+
+        # For chunked-prefill
+        if self.chunked_prefill and input_data.num_prefill_tokens != 0:
+            prefill_block_tables = make_tensor_with_pad(
+                self.input_data.prefill_block_tables,
+                pad=0,
+                dtype=torch.int32,
+                device=self.input_builder.device,
+            )
+            query_lens_tensor = torch.tensor(prefill_query_lens,
+                                             dtype=torch.int32,
+                                             device=self.input_builder.device)
+            kv_lens_tensor = torch.tensor(prefill_seq_lens,
+                                          dtype=torch.int32,
+                                          device=self.input_builder.device)
+            query_start_loc = torch.zeros(input_data.num_prefills + 1,
+                                          dtype=torch.int32,
+                                          device=self.input_builder.device)
+            kv_start_loc = torch.zeros(input_data.num_prefills + 1,
+                                       dtype=torch.int32,
+                                       device=self.input_builder.device)
+            torch.cumsum(query_lens_tensor,
+                         dim=0,
+                         dtype=torch.int32,
+                         out=query_start_loc[1:])
+            torch.cumsum(kv_lens_tensor,
+                         dim=0,
+                         dtype=torch.int32,
+                         out=kv_start_loc[1:])
+            max_query_len = max(prefill_query_lens)
+            max_kv_len = max(prefill_seq_lens)
+        else:
+            prefill_block_tables = None
+            query_start_loc = None
+            kv_start_loc = None
+            max_query_len = None
+            max_kv_len = None
+
+        # For paged attention
+        if input_data.num_decode_tokens != 0:
+            seq_lens_tensor = torch.tensor(
+                input_data.seq_lens[input_data.num_prefills:],
+                dtype=torch.int32,
+                device=self.input_builder.device,
+            )
+            block_tables = make_tensor_with_pad(
+                self.input_data.decode_block_tables,
+                pad=0,
+                dtype=torch.int32,
+                device=self.input_builder.device,
+            )
+            # lowest_dim_size = block_tables.size(-1)
+            # if lowest_dim_size < 1024:
+            #     padding_amount = 1024 - lowest_dim_size
+            #     padding = torch.zeros(*block_tables.size()[:-1], padding_amount, dtype=block_tables.dtype, device=block_tables.device)
+            #     block_tables = torch.cat((block_tables, padding), dim=-1)
+        else:
+            block_tables = torch.tensor([])
+            seq_lens_tensor = torch.tensor(
+                input_data.seq_lens[:input_data.num_prefills],
+                dtype=torch.int32,
+                device=self.input_builder.device,
+            )
+
+        # For multi-modal models
+        placeholder_index_maps = None
+        if len(input_data.multi_modal_inputs_list) != 0:
+            placeholder_index_maps = {
+                modality: placeholder_map.index_map()
+                for modality, placeholder_map in
+                input_data.multi_modal_placeholder_maps.items()
+            }
+
+        attn_metadata = VACCAttentionMetadata(
+            chunked_prefill=self.chunked_prefill,
+            seq_lens=seq_lens, #prefill_seq_lens,
+            seq_lens_tensor=seq_lens_tensor,
+            max_query_len=max_query_len,
+            max_kv_len=max_kv_len,
+            query_start_loc=query_start_loc,
+            kv_start_loc=kv_start_loc,
+            max_decode_seq_len=None,
+            num_prefills=input_data.num_prefills,
+            num_prefill_tokens=input_data.num_prefill_tokens,
+            num_decode_tokens=input_data.num_decode_tokens,
+            block_tables=block_tables,
+            prefill_block_tables=prefill_block_tables,
+            slot_mapping=slot_mapping,
+            multi_modal_placeholder_index_maps=placeholder_index_maps,
+            enable_kv_scales_calculation=False,
+        )
+        return attn_metadata
+
+class VACCAttentionBackendImpl(AttentionImpl[VACCAttentionMetadata]):
+
+    def __init__(
+        self,
+        num_heads: int,
+        head_size: int,
+        scale: float,
+        num_kv_heads: int,
+        alibi_slopes: Optional[List[float]],
+        sliding_window: Optional[int],
+        kv_cache_dtype: str,
+        blocksparse_params: Optional[Dict[str, Any]] = None,
+        logits_soft_cap: Optional[float] = None,
+        attn_type: str = AttentionType.DECODER,
+        kv_sharing_target_layer_name: Optional[str] = None,
+    ) -> None:
+        if blocksparse_params is not None:
+            raise ValueError(
+                "Torch SPDA does not support block-sparse attention.")
+        if logits_soft_cap is not None:
+            logger.warning_once("Torch SPDA does not support logits soft cap. "
+                                "Outputs may be slightly off.")
+        self.num_heads = num_heads
+        self.head_size = head_size
+        self.scale = float(scale)
+        self.num_kv_heads = num_kv_heads
+        if alibi_slopes is not None:
+            alibi_slopes = torch.tensor(alibi_slopes, dtype=torch.float32)
+        self.alibi_slopes = alibi_slopes
+        self.sliding_window = sliding_window
+        self.kv_cache_dtype = kv_cache_dtype
+
+        assert self.num_heads % self.num_kv_heads == 0
+        self.num_queries_per_kv = self.num_heads // self.num_kv_heads
+        self.need_mask = (self.alibi_slopes is not None
+                          or self.sliding_window is not None)
+
+        supported_head_sizes = PagedAttention.get_supported_head_sizes()
+        if head_size not in supported_head_sizes:
+            raise ValueError(
+                f"Head size {head_size} is not supported by PagedAttention. "
+                f"Supported head sizes are: {supported_head_sizes}.")
+        if kv_cache_dtype != "auto":
+            raise NotImplementedError(
+                "Torch SDPA backend does not support FP8 KV cache. "
+                "Please use xFormers backend instead.")
+        self.attn_type = attn_type
+
+    def forward(
+        self,
+        layer: torch.nn.Module,
+        query: torch.Tensor,
+        key: torch.Tensor,
+        value: torch.Tensor,
+        kv_cache: torch.Tensor,
+        attn_metadata: VACCAttentionMetadata,  # type: ignore
+        output: Optional[torch.Tensor] = None,
+    ) -> torch.Tensor:
+        """Forward pass with torch SDPA and PagedAttention.
+
+        Args:
+            query: shape = [num_tokens, num_heads * head_size]
+            key: shape = [num_tokens, num_kv_heads * head_size]
+            value: shape = [num_tokens, num_kv_heads * head_size]
+            kv_cache = [2, num_blocks, block_size * num_kv_heads * head_size]
+                NOTE: kv_cache will be an empty tensor with shape [0]
+                for profiling run.
+            attn_metadata: Metadata for attention.
+        Returns:
+            shape = [num_tokens, num_heads * head_size]
+        """
+        attn_type = self.attn_type
+        if (attn_type == AttentionType.ENCODER
+                and (not attn_metadata.is_all_encoder_attn_metadata_set)):
+            raise AttributeError("Encoder attention requires setting "
+                                 "encoder metadata attributes.")
+        elif (attn_type == AttentionType.ENCODER_DECODER
+              and (not attn_metadata.is_all_cross_attn_metadata_set)):
+            raise AttributeError("Encoder/decoder cross-attention "
+                                 "requires setting cross-attention "
+                                 "metadata attributes.")
+
+        # Reshape the query, key, and value tensors.
+        query = query.view(-1, self.num_heads, self.head_size)
+        if key is not None:
+            assert value is not None
+            key = key.view(-1, self.num_kv_heads, self.head_size)
+            value = value.view(-1, self.num_kv_heads, self.head_size)
+        else:
+            assert value is None
+        if (attn_type != AttentionType.ENCODER and kv_cache.numel() > 0):
+            # KV-cache during decoder-self- or
+            # encoder-decoder-cross-attention, but not
+            # during encoder attention.
+            #
+            # Even if there are no new key/value pairs to cache,
+            # we still need to break out key_cache and value_cache
+            # i.e. for later use by paged attention
+            key_cache, value_cache = PagedAttention.split_kv_cache(
+                kv_cache, self.num_kv_heads, self.head_size)
+
+
+            if (key is not None) and (value is not None):
+                if attn_type == AttentionType.ENCODER_DECODER:
+                    # Update cross-attention KV cache (prefill-only)
+                    # During cross-attention decode, key & value will be None,
+                    # preventing this IF-statement branch from running
+                    updated_slot_mapping = attn_metadata.cross_slot_mapping
+                else:
+                    # Update self-attention KV cache (prefill/decode)
+                    updated_slot_mapping = attn_metadata.slot_mapping
+                PagedAttention.write_to_paged_cache(key, value, key_cache,
+                                                    value_cache,
+                                                    updated_slot_mapping,
+                                                    self.kv_cache_dtype,
+                                                    layer._k_scale, layer._v_scale)
+
+        if attn_type != AttentionType.ENCODER:
+            # Decoder self-attention supports chunked prefill.
+            # Encoder/decoder cross-attention requires no chunked
+            # prefill (100% prefill or 100% decode tokens, no mix)
+            num_prefill_tokens = attn_metadata.num_prefill_tokens
+            num_decode_tokens = attn_metadata.num_decode_tokens
+        else:
+            # Encoder attention - chunked prefill is not applicable;
+            # derive token-count from query shape & and treat them
+            # as 100% prefill tokens
+            assert attn_metadata.num_encoder_tokens is not None
+            num_prefill_tokens = attn_metadata.num_encoder_tokens
+            num_decode_tokens = 0
+
+        if attn_type == AttentionType.DECODER:
+            # Only enforce this shape-constraint for decoder
+            # self-attention
+            assert key.shape[0] == num_prefill_tokens + num_decode_tokens
+            assert value.shape[0] == num_prefill_tokens + num_decode_tokens
+        output = torch.empty_like(query)
+        if prefill_meta := attn_metadata.prefill_metadata:
+            assert attn_metadata.seq_lens is not None
+            if (kv_cache.numel() == 0
+                    or prefill_meta.block_tables.numel() == 0):
+                self._run_vacc_forward(
+                    output,
+                    query,
+                    key,
+                    value,
+                    prefill_meta,
+                    attn_type=attn_type)
+            else:
+                # prefix-enabled attention
+                assert not self.need_mask
+                import intel_extension_for_pytorch.llm.modules as ipex_modules
+                output = torch.empty_like(query)
+                ipex_modules.PagedAttention.flash_attn_varlen_func(
+                    output[:prefill_meta.num_prefill_tokens, :, :],
+                    query[:prefill_meta.num_prefill_tokens, :, :],
+                    key_cache,
+                    value_cache,
+                    prefill_meta.query_start_loc,
+                    prefill_meta.kv_start_loc,
+                    prefill_meta.max_query_len,
+                    prefill_meta.max_kv_len,
+                    self.scale,
+                    True,
+                    prefill_meta.prefill_block_tables,
+                    self.alibi_slopes,
+                )
+
+        if decode_meta := attn_metadata.decode_metadata:
+            assert attn_type != AttentionType.ENCODER_ONLY, (
+                "Encoder-only models should not have decode metadata.")
+            # Decoding run.
+            # (
+            #     seq_lens_arg,
+            #     max_seq_len_arg,
+            #     block_tables_arg,
+            # ) = decode_meta.get_seq_len_block_table_args(attn_type)
+
+            # Note:
+            #   decode attention still use SDPA method
+            # reshape k/v_cache to (num_block_grp, block_grp_size, head, hidden_size)
+            k_cache = key_cache.view(-1, env_blk_grp_size, key_cache.shape[2], key_cache.shape[3])
+            v_cache = value_cache.view(-1, env_blk_grp_size, value_cache.shape[2], value_cache.shape[3])
+            block_per_group = env_blk_grp_size // 16
+            # convert block_tables to 8K group index
+            block_tables = (decode_meta.block_tables // block_per_group).to(torch.int32)
+            attn_outs = []
+            for i in range(decode_meta.seq_lens_tensor.shape[0]):
+                seq_len = decode_meta.seq_lens_tensor[i]
+                k_slices = k_cache[block_tables[i], ...]
+                k = \
+                    torch.cat([k_slices[i, ...] for i in range(len(block_tables[i]))], dim=0)[:seq_len]
+                v_slices = v_cache[block_tables[i], ...]
+                v = \
+                    torch.cat([v_slices[i, ...] for i in range(len(block_tables[i]))], dim=0)[:seq_len]
+                q = query[i : i + 1, ...]
+                attn_out = torch.vacc.scaled_dot_product_attention(
+                    query=q,
+                    key=k,
+                    value=v,
+                    attn_mask=None,
+                    dropout_p=0,
+                    is_causal=False,
+                    is_train=False,
+                    recompute=False,
+                    flash_attention=False,
+                    sm_scale=self.scale,
+                )
+                attn_outs.append(attn_out)
+            output = torch.cat(attn_outs, dim=0)
+            # '''
+
+            # PagedAttention.forward_decode(
+            #     output[attn_metadata.num_prefill_tokens:, :, :],
+            #     query[attn_metadata.num_prefill_tokens:, :, :],
+            #     key_cache,
+            #     value_cache,
+            #     block_tables_arg,
+            #     seq_lens_arg,
+            #     max_seq_len_arg,
+            #     self.kv_cache_dtype,
+            #     self.num_kv_heads,
+            #     self.scale,
+            #     self.alibi_slopes,
+            #     layer._k_scale,
+            #     layer._v_scale,
+            # )
+        # Reshape the output tensor.
+        return output.view(-1, self.num_heads * self.head_size)
+
+    def _run_vacc_forward(
+        self,
+        output: torch.Tensor,
+        query: torch.Tensor,
+        key: torch.Tensor,
+        value: torch.Tensor,
+        attn_metadata: VACCAttentionMetadata,
+        attn_type: AttentionType = AttentionType.DECODER,
+    ):
+        # if self.num_kv_heads != self.num_heads:
+        #     key = key.repeat_interleave(self.num_queries_per_kv, dim=1)
+        #     value = value.repeat_interleave(self.num_queries_per_kv, dim=1)
+        attn_masks = attn_metadata.get_attn_bias(attn_type)
+        if attn_masks is None:
+            if self.alibi_slopes is not None:
+                attn_masks = _make_alibi_bias(
+                    self.alibi_slopes, query.dtype,
+                    attn_metadata.seq_lens)  # type: ignore
+            elif self.sliding_window is not None:
+                assert attn_metadata.seq_lens is not None
+                attn_masks = _make_sliding_window_bias(
+                    attn_metadata.seq_lens, self.sliding_window,
+                    query.dtype)  # type: ignore
+            else:
+                seq_lens, _ = attn_metadata.get_seq_lens(attn_type)
+                attn_masks = [None] * len(seq_lens)
+            attn_metadata.set_attn_bias(attn_masks, attn_type)
+
+        causal_attn = (attn_type == AttentionType.DECODER)
+
+        seq_lens_q, seq_lens_kv = attn_metadata.get_seq_lens(attn_type)
+        start_q, start_kv = 0, 0
+        for seq_len_q, seq_len_kv, mask in zip(seq_lens_q, seq_lens_kv,
+                                               attn_masks):
+            end_q = start_q + seq_len_q
+            end_kv = start_kv + seq_len_kv
+            sub_out=torch.vacc.scaled_dot_product_attention(
+                query[start_q:end_q,:, :],
+                key[start_kv:end_kv,:, :],
+                value[start_kv:end_kv,:, :].contiguous(),
+                attn_mask=None,
+                dropout_p=0.0,
+                is_causal=True, #causal_attn and not self.need_mask,
+                is_train=False,
+                recompute=False,
+                flash_attention=False,
+                sm_scale=self.scale)
+            output[ start_q:end_q,:, :] = sub_out
+            start_q, start_kv = end_q, end_kv
+        return output
+
+
+def _make_alibi_bias(
+    alibi_slopes: torch.Tensor,
+    dtype: torch.dtype,
+    seq_lens: List[int],
+) -> List[torch.Tensor]:
+    attn_biases: List[torch.Tensor] = []
+    for seq_len in seq_lens:
+        bias = torch.arange(seq_len, dtype=dtype)
+        # NOTE(zhuohan): HF uses
+        #     `bias = bias[None, :].repeat(seq_len, 1)`
+        # here. We find that both biases give the same results, but
+        # the bias below more accurately follows the original ALiBi
+        # paper.
+        bias = bias[None, :] - bias[:, None]
+
+        num_heads = alibi_slopes.shape[0]
+        bias = bias[None, :].repeat((num_heads, 1, 1))
+        bias.mul_(alibi_slopes[:, None, None]).unsqueeze_(0)
+        inf_mask = torch.empty(
+            (1, seq_len, seq_len),
+            dtype=bias.dtype).fill_(-torch.inf).triu_(diagonal=1)
+        attn_biases.append((bias + inf_mask).to(dtype))
+
+    return attn_biases
+
+
+def _make_sliding_window_bias(
+    seq_lens: List[int],
+    window_size: Optional[int],
+    dtype: torch.dtype,
+) -> List[torch.Tensor]:
+    attn_biases: List[torch.Tensor] = []
+    for seq_len in seq_lens:
+        tensor = torch.full(
+            (1, seq_len, seq_len),
+            dtype=dtype,
+            fill_value=1,
+        )
+        shift = 0
+        mask = torch.tril(tensor, diagonal=shift).to(dtype)  # type: ignore
+        if window_size is not None:
+            mask = torch.triu(mask, diagonal=shift - window_size + 1)
+        mask = torch.log(mask)
+        attn_biases.append(mask.to(dtype))
+
+    return attn_biases

vllm_vacc/vllm/attention/backends/vacc_mla.py

@@ -0,0 +1,847 @@
+from collections import defaultdict
+from contextlib import contextmanager
+from dataclasses import dataclass
+from itertools import accumulate
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Type
+
+from vllm.multimodal import MultiModalPlaceholderMap
+
+try:
+    from flashinfer import BatchDecodeMlaWithPagedKVCacheWrapper
+    FLASHINFER_WORKSPACE_BUFFER_SIZE = 256 * 1024 * 1024
+except ImportError:
+    BatchDecodeMlaWithPagedKVCacheWrapper = None
+    FLASHINFER_WORKSPACE_BUFFER_SIZE = 0
+
+import torch
+
+from vllm import _custom_ops as ops
+from vllm.attention.backends.abstract import (AttentionBackend,
+                                              AttentionMetadata,
+                                              AttentionMetadataBuilder,
+                                              AttentionState, AttentionType)
+from vllm.attention.backends.mla.common import MLACommonImpl, MLACommonMetadata
+from vllm.attention.backends.utils import (PAD_SLOT_ID, compute_slot_mapping,
+                                           compute_slot_mapping_start_idx,
+                                           is_block_tables_empty)
+
+#from vllm.attention.ops.paged_attn import PagedAttention
+from vllm_vacc.vllm.attention.ops.vacc_paged_attn import VaccPagedAttention as PagedAttention
+# from vllm.attention.ops.triton_decode_attention import decode_attention_fwd
+from vllm.utils import async_tensor_h2d, make_tensor_with_pad
+
+# import time, os
+
+if TYPE_CHECKING:
+    from vllm_vacc.vllm.worker.vacc_model_runner import (ModelInputForVACCBuilder,
+                                          ModelInputForVACCWithSamplingMetadata)
+
+
+class VACCMLABackend(AttentionBackend):
+
+    @staticmethod
+    def get_name() -> str:
+        return "TORCH_VACC"
+
+    @staticmethod
+    def get_impl_cls() -> Type["VACCMLAImpl"]:
+        return VACCMLAImpl
+
+    @staticmethod
+    def get_metadata_cls() -> Type["AttentionMetadata"]:
+        return VACCMLAMetadata
+
+    @staticmethod
+    def get_builder_cls() -> Type["VACCMLAMetadataBuilder"]:
+        return VACCMLAMetadataBuilder
+
+    @staticmethod
+    def get_state_cls() -> Type["VACCMLAState"]:
+        return VACCMLAState
+
+    @staticmethod
+    def get_kv_cache_shape(
+        num_blocks: int,
+        block_size: int,
+        num_kv_heads: int,  # assumed to be 1 for MLA
+        head_size: int,
+    ) -> Tuple[int, ...]:
+        return (num_blocks, block_size, head_size)
+
+    @staticmethod
+    def swap_blocks(
+        src_kv_cache: torch.Tensor,
+        dst_kv_cache: torch.Tensor,
+        src_to_dst: torch.Tensor,
+    ) -> None:
+        PagedAttention.swap_blocks(src_kv_cache, dst_kv_cache, src_to_dst)
+
+    @staticmethod
+    def copy_blocks(
+        kv_caches: List[torch.Tensor],
+        src_to_dists: torch.Tensor,
+    ) -> None:
+        PagedAttention.copy_blocks(kv_caches, src_to_dists)
+
+    @staticmethod
+    def get_supported_head_sizes() -> List[int]:
+        return [576]
+
+
+class VACCMLAState(AttentionState):
+
+    def __init__(self, runner):
+        self.runner = runner
+        self._is_graph_capturing = False
+
+    @contextmanager
+    def graph_capture(self, max_batch_size: int):
+        self._is_graph_capturing = True
+
+        self._graph_slot_mapping = torch.full((max_batch_size, ),
+                                              PAD_SLOT_ID,
+                                              dtype=torch.long,
+                                              device=self.runner.device)
+        self._graph_seq_lens = torch.ones(max_batch_size,
+                                          dtype=torch.int32,
+                                          device=self.runner.device)
+        self._graph_block_tables = torch.from_numpy(
+            self.runner.graph_block_tables).to(device=self.runner.device)
+
+        self._positions = torch.zeros((max_batch_size, ),
+                                      dtype=torch.long,
+                                      device=self.runner.device)
+
+        yield
+
+        self._is_graph_capturing = False
+        del self._graph_slot_mapping
+        del self._graph_seq_lens
+        del self._graph_block_tables
+        del self._positions
+
+    def graph_clone(self, batch_size: int):
+        assert self._is_graph_capturing
+        return self.__class__(self.runner)
+
+    def graph_capture_get_metadata_for_batch(
+            self, batch_size: int, is_encoder_decoder_model: bool = False):
+        assert self._is_graph_capturing
+
+        attn_metadata = self.runner.attn_backend.make_metadata(
+            num_prefills=0,
+            num_prefill_tokens=0,
+            num_decode_tokens=batch_size,
+            slot_mapping=self._graph_slot_mapping[:batch_size],
+            multi_modal_placeholder_index_maps=None,
+            enable_kv_scales_calculation=True,
+            seq_lens=None,
+            seq_lens_tensor=self._graph_seq_lens[:batch_size],
+            # max_query_len=1,
+            # max_decode_query_len=1,
+            max_prefill_seq_len=0,
+            max_decode_seq_len=self.runner.max_seq_len_to_capture,
+            query_start_loc=None,
+            seq_start_loc=None,
+            context_lens_tensor=None,
+            block_tables=self._graph_block_tables[:batch_size],
+            use_cuda_graph=True,
+            input_positions=self._positions[:batch_size],
+            head_dim=self.runner.model_config.get_head_size())
+
+        if is_encoder_decoder_model:
+            raise NotImplementedError(
+                "VACCMLAState does not support encoder/decoder yet")
+
+        return attn_metadata
+
+    def get_graph_input_buffers(self,
+                                attn_metadata,
+                                is_encoder_decoder_model: bool = False):
+        input_buffers = {
+            "slot_mapping": attn_metadata.slot_mapping,
+            "seq_lens_tensor": attn_metadata.decode_metadata.seq_lens_tensor,
+            "block_tables": attn_metadata.decode_metadata.block_tables,
+            "input_positions": attn_metadata.decode_metadata.input_positions,
+        }
+        if is_encoder_decoder_model:
+            raise NotImplementedError(
+                "VACCMLAState does not support encoder/decoder yet")
+
+        return input_buffers
+
+    def prepare_graph_input_buffers(self,
+                                    input_buffers,
+                                    attn_metadata,
+                                    is_encoder_decoder_model: bool = False):
+        input_positions = attn_metadata.input_positions
+        num_positions = input_positions.shape[0]
+        input_buffers["seq_lens_tensor"].copy_(
+            attn_metadata.decode_metadata.seq_lens_tensor, non_blocking=True)
+        input_buffers["block_tables"].copy_(
+            attn_metadata.decode_metadata.block_tables, non_blocking=True)
+        # CUDA graph buffer is padded so only perform a partial copy based on
+        # num_positions
+        input_buffers["input_positions"][:num_positions].copy_(
+            input_positions, non_blocking=True)
+        if is_encoder_decoder_model:
+            raise NotImplementedError(
+                "VACCMLAState does not support encoder/decoder yet")
+
+    def begin_forward(self, model_input):
+        return
+
+
+@dataclass
+class VACCMLAMetadata(MLACommonMetadata):
+    """Metadata for VACCMLAMetadata.
+
+    NOTE: Any python object stored here is not updated when it is
+    cuda-graph replayed. If you have values that need to be changed
+    dynamically, it should be stored in tensor. The tensor has to be
+    updated from `CUDAGraphRunner.forward` API.
+    """
+    # (batch_size,). The sequence length per sequence. Sequence length means
+    # the computed tokens + new tokens None if it is a decoding.
+    seq_lens: Optional[List[int]]
+    # seq_lens stored as a tensor.
+    seq_lens_tensor: Optional[torch.Tensor]
+
+    # NOTE(sang): Definition of context_len, query_len, and seq_len.
+    # |---------- N-1 iteration --------|
+    # |---------------- N iteration ---------------------|
+    # |- tokenA -|......................|-- newTokens ---|
+    # |---------- context_len ----------|
+    # |-------------------- seq_len ---------------------|
+    #                                   |-- query_len ---|
+
+    # Maximum sequence length among prefill batch. 0 if there are decoding
+    # requests only.
+    max_prefill_seq_len: int
+    # Maximum sequence length among decode batch. 0 if there are prefill
+    # requests only.
+    max_decode_seq_len: int
+    # (batch_size,) A tensor of context lengths (tokens that are computed
+    # so far).
+    context_lens_tensor: Optional[torch.Tensor]
+
+    # (batch_size, max_blocks_per_seq).
+    # Block addresses per sequence. (Seq id -> list of physical block)
+    # E.g., [0, 1, 2] means tokens are stored in 0th, 1st, and 2nd blocks
+    # in the kv cache. Each block can contain up to block_size tokens.
+    # 2nd dimensions are padded up to max_blocks_per_seq if it is cuda-graph
+    # captured.
+    block_tables: Optional[torch.Tensor]
+
+    # Whether or not if cuda graph is enabled.
+    # Cuda-graph is currently enabled for decoding only.
+    # TODO(woosuk): Move `use_cuda_graph` out since it's unrelated to attention.
+
+    use_cuda_graph: bool
+
+    # Maximum query length in the batch.
+    max_query_len: Optional[int] = None
+    input_positions: Optional[torch.Tensor] = None
+    # Max number of query tokens among request in the batch.
+    max_decode_query_len: Optional[int] = None
+
+    # (batch_size + 1,). The cumulative subquery lengths of the sequences in
+    # the batch, used to index into subquery. E.g., if the subquery length
+    # is [4, 6], it is [0, 4, 10].
+    query_start_loc: Optional[torch.Tensor] = None
+    # (batch_size + 1,). The cumulative sequence lengths of the sequences in
+    # the batch, used to index into sequence. E.g., if the sequence length is
+    # [4, 6], it is [0, 4, 10].
+    seq_start_loc: Optional[torch.Tensor] = None
+
+    _cached_prefill_metadata: Optional["VACCMLAMetadata"] = None
+    _cached_decode_metadata: Optional["VACCMLAMetadata"] = None
+
+    num_prefill_tokens: int
+
+    num_kv_splits: int = 4  # TODO(lucas) add heuristic
+    attn_logits: Optional[torch.Tensor] = None
+    req_idx: Optional[torch.Tensor] = None
+
+    # The dimension of the attention heads
+    head_dim: Optional[int] = None
+
+    def __post_init__(self):
+        supported_head_sizes = VACCMLABackend.get_supported_head_sizes()
+        if self.head_dim is not None and self.head_dim \
+                not in supported_head_sizes:
+            raise ValueError(
+                f"Only {supported_head_sizes} are supported for head_dim,",
+                f"received {self.head_dim}.")
+
+    @property
+    def prefill_metadata(self) -> Optional["VACCMLAMetadata"]:
+        if self.num_prefills == 0:
+            return None
+
+        if self._cached_prefill_metadata is not None:
+            return self._cached_prefill_metadata
+
+        assert self.seq_lens is not None
+        assert self.seq_lens_tensor is not None
+
+        # Compute some attn_metadata fields which default to None
+        query_start_loc = (None if self.query_start_loc is None else
+                           self.query_start_loc[:self.num_prefills + 1])
+        slot_mapping = (None if self.slot_mapping is None else
+                        self.slot_mapping[:self.num_prefill_tokens])
+        seq_lens = (None if self.seq_lens is None else
+                    self.seq_lens[:self.num_prefills])
+        seq_lens_tensor = (None if self.seq_lens_tensor is None else
+                           self.seq_lens_tensor[:self.num_prefills])
+        seq_start_loc = (None if self.seq_start_loc is None else
+                         self.seq_start_loc[:self.num_prefills + 1])
+        context_lens_tensor = (None if self.context_lens_tensor is None else
+                               self.context_lens_tensor[:self.num_prefills])
+        block_tables = (None if self.block_tables is None else
+                        self.block_tables[:self.num_prefills])
+        input_positions = (None if self.input_positions is None else
+                           self.input_positions[:self.num_prefill_tokens])
+
+        self._cached_prefill_metadata = VACCMLAMetadata(
+            num_prefills=self.num_prefills,
+            num_prefill_tokens=self.num_prefill_tokens,
+            num_decode_tokens=0,
+            slot_mapping=slot_mapping,
+            multi_modal_placeholder_index_maps=self.
+            multi_modal_placeholder_index_maps,
+            enable_kv_scales_calculation=self.enable_kv_scales_calculation,
+            input_positions=input_positions,
+            seq_lens=seq_lens,
+            seq_lens_tensor=seq_lens_tensor,
+            max_prefill_seq_len=None,
+            max_decode_seq_len=0,
+            query_start_loc=query_start_loc,
+            seq_start_loc=seq_start_loc,
+            context_lens_tensor=context_lens_tensor,
+            block_tables=block_tables,
+            use_cuda_graph=False,
+            head_dim=self.head_dim)
+        return self._cached_prefill_metadata
+
+    @property
+    def decode_metadata(self) -> Optional["VACCMLAMetadata"]:
+        if self.num_decode_tokens == 0:
+            return None
+
+        if self._cached_decode_metadata is not None:
+            return self._cached_decode_metadata
+        assert self.seq_lens_tensor is not None
+
+        # Compute some attn_metadata fields which default to None
+        slot_mapping = (None if self.slot_mapping is None else
+                        self.slot_mapping[self.num_prefill_tokens:])
+        seq_lens_tensor = (None if self.seq_lens_tensor is None else
+                           self.seq_lens_tensor[self.num_prefills:])
+        block_tables = (None if self.block_tables is None else
+                        self.block_tables[self.num_prefills:])
+        input_positions = (None if self.input_positions is None else
+                           self.input_positions[self.num_prefill_tokens:])
+
+        self._cached_decode_metadata = VACCMLAMetadata(
+            num_prefills=0,
+            num_prefill_tokens=0,
+            num_decode_tokens=self.num_decode_tokens,
+            slot_mapping=slot_mapping,
+            multi_modal_placeholder_index_maps=None,
+            enable_kv_scales_calculation=True,
+            seq_lens=self.seq_lens,
+            seq_lens_tensor=seq_lens_tensor,
+            max_decode_query_len=self.max_decode_query_len,
+            max_query_len=self.max_query_len,
+            max_prefill_seq_len=0,
+            max_decode_seq_len=self.max_decode_seq_len,
+            # Batch may be composed of prefill|decodes, adjust query start
+            # indices to refer to the start of decodes. E.g.
+            # in tokens:[3 prefills|6 decodes], query_start_loc=[3,9] => [0,6].
+            query_start_loc=(self.query_start_loc[self.num_prefills:] -
+                             self.query_start_loc[self.num_prefills])
+            if self.query_start_loc is not None else None,
+            seq_start_loc=self.seq_start_loc[self.num_prefills:]
+            if self.seq_start_loc is not None else None,
+            context_lens_tensor=None,
+            block_tables=block_tables,
+            use_cuda_graph=self.use_cuda_graph,
+            input_positions=input_positions,
+            head_dim=self.head_dim)
+        return self._cached_decode_metadata
+
+    def advance_step(self,
+                     model_input: "ModelInputForVACCWithSamplingMetadata",
+                     sampled_token_ids: Optional[torch.Tensor],
+                     block_size: int,
+                     num_seqs: int,
+                     num_queries: int,
+                     turn_prefills_into_decodes: bool = False):
+        """
+        Update metadata in-place to advance one decode step.
+        """
+        # When using cudagraph, the num_seqs is padded to the next captured
+        # batch sized, but num_queries tracks the actual number of requests in
+        # the batch. For --enforce-eager mode, num_seqs == num_queries
+        if num_seqs != num_queries:
+            assert num_seqs > num_queries
+            assert self.use_cuda_graph
+
+        if turn_prefills_into_decodes:
+            # When Mutli-Step is enabled with Chunked-Prefill, prefills and
+            # decodes are scheduled together. In the first step, all the
+            # prefills turn into decodes. This update reflects that
+            # conversion.
+            assert self.num_decode_tokens + self.num_prefills == num_seqs
+            self.num_decode_tokens += self.num_prefills
+            self.num_prefills = 0
+            # self.num_prefill_tokens = 0
+            # self.max_prefill_seq_len = 0
+            self.max_query_len = 1
+
+            self.slot_mapping = self.slot_mapping[:num_seqs]
+        else:
+            assert self.seq_lens is not None
+            assert self.max_decode_seq_len == max(self.seq_lens)
+
+        assert self.num_prefills == 0
+        assert self.num_prefill_tokens == 0
+        assert self.num_decode_tokens == num_seqs
+        assert self.slot_mapping.shape == (num_seqs, )
+
+        assert self.seq_lens is not None
+        assert len(self.seq_lens) == num_seqs
+        assert self.seq_lens_tensor is not None
+        assert self.seq_lens_tensor.shape == (num_seqs, )
+        # assert self.max_query_len == 1
+        # assert self.max_prefill_seq_len == 0
+
+        assert self.query_start_loc is not None
+        assert self.query_start_loc.shape == (num_queries + 1, )
+        assert self.seq_start_loc is not None
+        assert self.seq_start_loc.shape == (num_seqs + 1, )
+
+        assert self.context_lens_tensor is not None
+        assert self.context_lens_tensor.shape == (num_queries, )
+
+        assert self.block_tables is not None
+        assert self.block_tables.shape[0] == num_seqs
+
+        # Update query lengths. Note that we update only queries and not seqs,
+        # since tensors may be padded due to captured cuda graph batch size
+        for i in range(num_queries):
+            self.seq_lens[i] += 1
+        # self.max_decode_seq_len = None
+
+        ops.advance_step_flashattn(num_seqs=num_seqs,
+                                   num_queries=num_queries,
+                                   block_size=block_size,
+                                   input_tokens=model_input.input_tokens,
+                                   sampled_token_ids=sampled_token_ids,
+                                   input_positions=model_input.input_positions,
+                                   seq_lens=self.seq_lens_tensor,
+                                   slot_mapping=self.slot_mapping,
+                                   block_tables=self.block_tables)
+
+
+class VACCMLAMetadataBuilder(AttentionMetadataBuilder[VACCMLAMetadata]):
+
+    def __init__(self, input_builder: "ModelInputForVACCBuilder"):
+        self.chunked_prefill = True
+        if hasattr(input_builder, 'chunked_prefill'):
+            self.chunked_prefill = input_builder.chunked_prefill
+        self.input_builder = input_builder
+        self.runner = input_builder.runner
+        self.sliding_window = input_builder.sliding_window
+        self.block_size = input_builder.block_size
+
+    def prepare(self):
+        self.slot_mapping: List[int] = []
+        self.prefill_seq_lens: List[int] = []
+        self.context_lens: List[int] = []
+        self.block_tables: List[List[int]] = []
+        self.curr_seq_lens: List[int] = []
+        self.input_positions: List[int] = []
+        self.multimodal_placeholder_maps: Dict[
+            str,
+            MultiModalPlaceholderMap] = defaultdict(MultiModalPlaceholderMap)
+        self.num_prefills = 0
+        self.num_prefill_tokens = 0
+        self.num_decode_tokens = 0
+        self.has_prefix_cache_hit = False
+
+    def build(self, seq_lens: List[int], query_lens: List[int],
+              cuda_graph_pad_size: int, batch_size: int):
+        """Build attention metadata with on-device tensors.
+
+        Args:
+            seq_lens: The maybe padded sequence lengths of the input sequences.
+            query_lens: The query lengths of the input sequences.
+            cuda_graph_pad_size: The padding size for cuda graph.
+                                 -1 if cuda graph is not used.
+            batch_size: The maybe padded batch size.
+        """
+
+        self.input_data = self.input_builder.input_data
+        
+        self.slot_mapping=self.input_data.slot_mapping
+        self.context_lens= self.input_data.context_lens
+        if self.input_data.num_prefill_tokens !=0:
+            
+            self.block_tables = self.input_data.prefill_block_tables
+        else:
+            self.block_tables= self.input_data.decode_block_tables
+        self.input_positions= self.input_data.input_positions
+        
+        self.prefill_seq_lens = seq_lens[0:self.input_data.num_prefills]
+        
+        self.num_prefills = self.input_data.num_prefills
+        self.num_prefill_tokens = self.input_data.num_prefill_tokens
+        self.num_decode_tokens = self.input_data.num_decode_tokens
+
+        device = self.runner.device
+        use_captured_graph = cuda_graph_pad_size != -1
+
+        # max_query_len = max(query_lens)
+        # decode_query_lens = query_lens[self.num_prefills:]
+        # if len(decode_query_lens) > 0:
+        #     max_decode_query_len = max(decode_query_lens)
+        # else:
+        #     max_decode_query_len = 1
+        # max_prefill_seq_len = max(self.prefill_seq_lens, default=0)
+        # max_decode_seq_len = max(self.curr_seq_lens, default=0)
+        num_decode_tokens = self.num_decode_tokens
+        query_start_loc = list(accumulate(query_lens, initial=0))
+        seq_start_loc = list(accumulate(seq_lens, initial=0))
+
+        num_seqs = len(seq_lens)
+        if use_captured_graph:
+            self.slot_mapping.extend([PAD_SLOT_ID] * cuda_graph_pad_size)
+            self.block_tables.extend([] * cuda_graph_pad_size)
+            num_decode_tokens = batch_size - self.num_prefill_tokens
+            block_tables = self._get_graph_runner_block_tables(
+                num_seqs, self.block_tables)
+        else:
+            block_tables = make_tensor_with_pad(
+                self.block_tables,
+                pad=0,
+                dtype=torch.int,
+                device=device,
+            )
+        # assert max_query_len > 0, ("query_lens: {}".format(query_lens))
+
+        assert device is not None
+        context_lens_tensor = async_tensor_h2d(self.context_lens, torch.int,
+                                               device, self.runner.pin_memory)
+        seq_lens_tensor = async_tensor_h2d(seq_lens, torch.int, device,
+                                           self.runner.pin_memory)
+        input_positions = async_tensor_h2d(self.input_positions, torch.int,
+                                           device, self.runner.pin_memory)
+        slot_mapping_tensor = async_tensor_h2d(self.slot_mapping, torch.int,
+                                               device, self.runner.pin_memory)
+        query_start_loc_tensor = async_tensor_h2d(query_start_loc, torch.int32,
+                                                  device,
+                                                  self.runner.pin_memory)
+        seq_start_loc_tensor = async_tensor_h2d(seq_start_loc, torch.int32,
+                                                device, self.runner.pin_memory)
+        placeholder_index_maps = {
+            modality: placeholder_map.index_map()
+            for modality, placeholder_map in
+            self.multimodal_placeholder_maps.items()
+        }
+        return VACCMLAMetadata(
+            num_prefills=self.num_prefills,
+            slot_mapping=slot_mapping_tensor,
+            num_prefill_tokens=self.num_prefill_tokens,
+            num_decode_tokens=num_decode_tokens,
+            seq_lens=seq_lens,
+            multi_modal_placeholder_index_maps=placeholder_index_maps,
+            enable_kv_scales_calculation=True,
+            input_positions=input_positions,
+            seq_lens_tensor=seq_lens_tensor,
+            # max_query_len=max_query_len,
+            # max_decode_query_len=None,
+            max_prefill_seq_len=None,
+            max_decode_seq_len=None,
+            query_start_loc=query_start_loc_tensor,
+            seq_start_loc=seq_start_loc_tensor,
+            context_lens_tensor=context_lens_tensor,
+            block_tables=block_tables,
+            use_cuda_graph=use_captured_graph,
+            num_kv_splits=4,  # TODO(lucas) add heuristic
+            head_dim=self.runner.model_config.get_head_size(),
+        )
+
+
+class VACCMLAImpl(MLACommonImpl[VACCMLAMetadata]):
+
+    def __init__(
+            self,
+            num_heads: int,
+            head_size: int,
+            scale: float,
+            num_kv_heads: int,
+            alibi_slopes: Optional[List[float]],
+            sliding_window: Optional[int],
+            kv_cache_dtype: str,
+            blocksparse_params: Optional[Dict[str, Any]],
+            logits_soft_cap: Optional[float],
+            attn_type: str,
+            kv_sharing_target_layer_name: Optional[str],
+            # MLA Specific Arguments
+            **kwargs) -> None:
+        super().__init__(num_heads, head_size, scale, num_kv_heads,
+                         alibi_slopes, sliding_window, kv_cache_dtype,
+                         blocksparse_params, logits_soft_cap, attn_type,
+                         kv_sharing_target_layer_name, **kwargs)
+        unsupported_features = [
+            alibi_slopes, sliding_window, blocksparse_params, logits_soft_cap
+        ]
+        if any(unsupported_features):
+            raise NotImplementedError(
+                "VACCMLAImpl does not support one of the following: "
+                "alibi_slopes, sliding_window, blocksparse_params, "
+                "logits_soft_cap")
+
+        if attn_type != AttentionType.DECODER:
+            raise NotImplementedError("Encoder self-attention and "
+                                      "encoder/decoder cross-attention "
+                                      "are not implemented for "
+                                      "VACCMLAImpl")
+
+    def extract_weights(self):
+        weights = {}
+        if hasattr(self, 'W_Q'):
+            weights["W_Q"] = self.W_Q
+        if hasattr(self, 'W_Q_scales'):
+            weights["W_Q_scales"] = self.W_Q_scales
+        if hasattr(self, 'W_QR'):
+            weights['W_QR'] = self.W_QR
+        if hasattr(self, 'W_QR_scales'):
+            weights["W_QR_scales"] = self.W_QR_scales
+        if hasattr(self, 'W_Q_QR'):
+            weights["W_Q_QR"] = self.W_Q_QR
+        if hasattr(self, 'W_Q_QR_scales'):
+            weights["W_Q_QR_scales"] = self.W_Q_QR_scales
+        if hasattr(self, 'W_UK'):
+            weights['W_UK'] = self.W_UK
+        if hasattr(self, 'W_UK_scales'):
+            weights['W_UK_scales'] = self.W_UK_scales
+        if hasattr(self, 'W_Q_UK_scales'):
+            weights['W_Q_UK_scales'] = self.W_Q_UK_scales
+        if hasattr(self, 'W_UV'):
+            weights['W_UV'] = self.W_UV
+        if hasattr(self, 'W_UV_scales'):
+            weights['W_UV_scales'] = self.W_UV_scales
+        if hasattr(self, 'W_UV_O'):
+            weights['W_UV_O'] = self.W_UV_O
+        if hasattr(self, 'W_UV_O_scales'):
+            weights['W_UV_O_scales'] = self.W_UV_O_scales
+        return weights
+
+    def _forward_prefill(
+        self,
+        q: torch.Tensor,
+        kv_c_normed: torch.Tensor,
+        k_pe: torch.Tensor,
+        kv_c_and_k_pe_cache: torch.Tensor,
+        attn_metadata: VACCMLAMetadata,
+    ) -> torch.Tensor:
+        assert isinstance(attn_metadata, VACCMLAMetadata)
+        kv_nope = self.kv_b_proj(kv_c_normed)[0]\
+            .view(-1, self.num_heads, self.qk_nope_head_dim + self.v_head_dim)
+        k_nope, v = kv_nope\
+            .split([self.qk_nope_head_dim, self.v_head_dim], dim=-1)
+
+        k = torch.cat((k_nope, k_pe.expand((*k_nope.shape[:-1], -1))), dim=-1)
+        v = v.contiguous()
+
+        # For MLA the v head dim is smaller than qk head dim so we pad out
+        # v with 0s to match the qk head dim
+        # v_padded = torch.nn.functional.pad(v, [0, q.shape[-1] - v.shape[-1]],
+        #                                    value=0)
+        # attn_output = torch.vacc.scaled_dot_product_attention(
+        #     query=q,
+        #     key=k,
+        #     value=v_padded,
+        #     attn_mask=None,
+        #     dropout_p=0,
+        #     is_causal=True,
+        #     is_train=False,
+        #     recompute=False,
+        #     flash_attention=True,
+        #     sm_scale=self.scale
+        # )
+
+        # attn_output = attn_output\
+        #     .view(-1, self.num_heads, q.shape[-1])[..., :v.shape[-1]]\
+        #         .reshape(-1, self.num_heads * v.shape[-1])
+        seq_lens = attn_metadata.prefill_metadata.seq_lens
+        if len(seq_lens) == 1:
+            # Vacc supports different head dim of v and qk.
+            attn_output = torch.vacc.scaled_dot_product_attention(
+                query=q,
+                key=k,
+                value=v,
+                attn_mask=None,
+                dropout_p=0,
+                is_causal=True,
+                is_train=False,
+                recompute=False,
+                flash_attention=False,
+                sm_scale=self.scale
+            )
+            attn_out = attn_output.view(-1, self.num_heads * v.shape[-1])
+        else:
+            attn_outs = []
+            start = 0
+            for seq in seq_lens:
+                end = start + seq
+                attn_out = torch.vacc.scaled_dot_product_attention(
+                    query=q[start:end, :],
+                    key=k[start:end, :],
+                    value=v[start:end, :],
+                    attn_mask=None,
+                    dropout_p=0,
+                    is_causal=True,
+                    is_train=False,
+                    recompute=False,
+                    flash_attention=False,
+                    sm_scale=self.scale
+                )
+                start = end
+                attn_outs.append(attn_out)
+            attn_out = torch.cat(attn_outs, dim=0).view(-1, self.num_heads * v.shape[-1])
+
+        return self.o_proj(attn_out)[0]
+
+    def _forward_decode(
+        self,
+        q_nope: torch.Tensor,
+        q_pe: torch.Tensor,
+        kv_c_and_k_pe_cache: torch.Tensor,
+        attn_metadata: VACCMLAMetadata,
+    ) -> torch.Tensor:
+        assert kv_c_and_k_pe_cache.numel() > 0
+        if self.kv_cache_dtype.startswith("fp8"):
+            raise NotImplementedError("FP8 Triton MLA not yet supported")
+
+        decode_meta = attn_metadata.decode_metadata
+        assert decode_meta is not None
+        B = q_nope.shape[0]
+
+        q = torch.cat([q_nope, q_pe], dim=-1)
+        o = torch.zeros(B,
+                        self.num_heads,
+                        self.kv_lora_rank,
+                        dtype=q.dtype,
+                        device=q.device)
+
+        # Add a head dim of 1
+        kv_c_and_k_pe_cache = kv_c_and_k_pe_cache.unsqueeze(2)
+        # print(f"kv_c_and_k_pe_cache: {kv_c_and_k_pe_cache.shape} ")
+        kv_c_cache = kv_c_and_k_pe_cache[..., :self.kv_lora_rank]
+
+        # Run MQA using paged_attention
+        # o = torch.vacc.paged_attention(
+        #     query=q,
+        #     key_cache=kv_c_and_k_pe_cache,
+        #     value_cache=kv_c_cache,
+        #     block_table=decode_meta.block_tables,
+        #     seq_len=decode_meta.seq_lens_tensor,
+        #     out=o,
+        #     sm_scale=self.scale
+        # )
+
+        # Run MQA using spda
+        # t0 = time.time()
+        o = vacc_paged_attention_naive(
+            q,
+            kv_c_and_k_pe_cache,
+            kv_c_cache,
+            block_table = decode_meta.block_tables,
+            # seq_lens = decode_meta.seq_lens_tensor,
+            seq_lens=decode_meta.seq_lens,
+            out = o,
+            sm_scale=self.scale)
+        # print(f'{os.getpid()} paged_atten(seq: {decode_meta.seq_lens}) time: {time.time() - t0}')
+
+        return self._v_up_proj_and_o_proj(o)
+
+def vacc_paged_attention_naive(
+    query: torch.Tensor,
+    key_cache: torch.Tensor,
+    value_cache: torch.Tensor,
+    block_table: torch.Tensor,
+    # seq_lens: torch.Tensor,
+    seq_lens: int,
+    out: Optional[torch.Tensor] = None,
+    sm_scale = -1
+) -> torch.Tensor:
+
+    # gurantee batch=1 perf
+    if len(seq_lens) == 1:
+        k = key_cache.view(-1, key_cache.shape[2], key_cache.shape[3])[:seq_lens[0]]
+        v = value_cache.view(-1, value_cache.shape[2], value_cache.shape[3])[:seq_lens[0]]
+        attn_out = torch.vacc.scaled_dot_product_attention(
+            query=query,
+            key=k,
+            value=v,
+            attn_mask=None,
+            dropout_p=0,
+            is_causal=False,
+            is_train=False,
+            recompute=False,
+            flash_attention=False,
+            sm_scale=sm_scale
+        )
+    else:
+        # t0 = time.time()
+        attn_outs = []
+        for i in range(len(seq_lens)):
+            k_slices = key_cache[block_table[i], :, :, :]
+            k = torch.cat([k_slices[i, :, :, :].unsqueeze(1) for i in range(len(block_table[i]))], dim=0)
+            k = k.view(-1, key_cache.shape[2], key_cache.shape[3])[:seq_lens[i]]
+            v_slices = value_cache[block_table[i], :, :, :]
+            v = torch.cat([v_slices[i, :, :, :].unsqueeze(1) for i in range(len(block_table[i]))], dim=0)
+            v = v.view(-1, value_cache.shape[2], value_cache.shape[3])[:seq_lens[i]]
+
+            attn_out = torch.vacc.scaled_dot_product_attention(
+                query=query[i:i+1,:,:],
+                key=k,
+                value=v,
+                attn_mask=None,
+                dropout_p=0,
+                is_causal=False,
+                is_train=False,
+                recompute=False,
+                flash_attention=False,
+                sm_scale=sm_scale
+            )
+            attn_outs.append(attn_out)
+
+        attn_out = torch.cat(attn_outs, dim=0)
+    # print(f'{os.getpid()} call spda(seq: {seq_lens}) time: {time.time() - t0}')
+    return attn_out
+
+# MLA single op impl
+def vacc_paged_attention_naive_singleop(
+    query: torch.Tensor,
+    key_cache: torch.Tensor,
+    value_cache: torch.Tensor,
+    seq_lens,
+    block_table = None,
+    out: torch.Tensor = None,
+    sm_scale = -1
+) -> torch.Tensor:
+    k = key_cache.view(-1, key_cache.shape[2], key_cache.shape[3])[:seq_lens]
+    v = value_cache.view(-1, value_cache.shape[2], value_cache.shape[3])[:seq_lens].squeeze(1)
+    pe_cache = k[..., 512:].squeeze(1)
+    print(f'q:{query[..., :512].shape} v:{v.shape} pe_cache:{pe_cache.shape}')
+    q_nope_kv_c = torch.einsum("shc,tc->sht", query[..., :512], v)
+    q_pe_k_pe = torch.einsum("shr,tr->sht", query[..., 512:], pe_cache)
+    scores = (q_nope_kv_c + q_pe_k_pe) * sm_scale
+    scores = scores.softmax(dim=-1, dtype=torch.float32).type_as(query)
+    o = torch.einsum("sht,tc->shc", scores, v)
+    return o

vllm_vacc/vllm/attention/ops/vacc_paged_attn.py

@@ -0,0 +1,160 @@
+from dataclasses import dataclass
+from typing import List, Optional, Tuple
+
+import torch
+
+from vllm.triton_utils import HAS_TRITON
+
+if HAS_TRITON:
+    from vllm.attention.ops.prefix_prefill import context_attention_fwd
+
+# Should be the same as PARTITION_SIZE in `paged_attention_v2_launcher`.
+_PARTITION_SIZE = 512
+
+@dataclass
+class PagedAttentionMetadata:
+    """Metadata for PagedAttention."""
+    # (batch_size,). The length of sequences (entire tokens seen so far) per
+    # sequence.
+    seq_lens_tensor: Optional[torch.Tensor]
+    # Maximum sequence length in the batch. 0 if it is prefill-only batch.
+    max_decode_seq_len: int
+    # (batch_size, max_blocks_per_seq).
+    # Block addresses per sequence. (Seq id -> list of physical block)
+    # E.g., [0, 1, 2] means tokens are stored in 0th, 1st, and 2nd blocks
+    # in the kv cache. Each block can contain up to block_size tokens.
+    # 2nd dimensions are padded up to max_blocks_per_seq if it is cuda-graph
+    # captured.
+    block_tables: Optional[torch.Tensor]
+
+class VaccPagedAttention:
+
+    @staticmethod
+    def get_supported_head_sizes() -> List[int]:
+        return [32, 64, 80, 96, 112, 120, 128, 192, 256]
+
+    @staticmethod
+    def get_kv_cache_shape(
+        num_blocks: int,
+        block_size: int,
+        num_kv_heads: int,
+        head_size: int,
+    ) -> Tuple[int, ...]:
+        return (2, num_blocks, block_size * num_kv_heads * head_size)
+
+    @staticmethod
+    def split_kv_cache(
+        kv_cache: torch.Tensor,
+        num_kv_heads: int,
+        head_size: int,
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        # x = 16 // kv_cache.element_size()
+        num_blocks = kv_cache.shape[1]
+
+        key_cache = kv_cache[0]
+        key_cache = key_cache.view(num_blocks, -1,num_kv_heads, head_size)
+        value_cache = kv_cache[1]
+        value_cache = value_cache.view(num_blocks, -1, num_kv_heads, head_size)
+        return key_cache, value_cache
+
+    @staticmethod
+    def write_to_paged_cache(
+        key: torch.Tensor,
+        value: torch.Tensor,
+        key_cache: torch.Tensor,
+        value_cache: torch.Tensor,
+        slot_mapping: torch.Tensor,
+        kv_cache_dtype: str,
+        k_scale: float,
+        v_scale: float,
+    ) -> None:
+        # list_from_tensor  = slot_mapping.tolist()
+        torch.vacc.reshape_and_cache_attention(key,key_cache,slot_mapping)
+        torch.vacc.reshape_and_cache_attention(value,value_cache,slot_mapping)
+
+    @staticmethod
+    def forward_decode(
+        output: torch.Tensor,
+        query: torch.Tensor,
+        key_cache: torch.Tensor,
+        value_cache: torch.Tensor,
+        block_tables: torch.Tensor,
+        seq_lens: torch.Tensor,
+        max_seq_len: int,
+        kv_cache_dtype: str,
+        num_kv_heads: int,
+        scale: float,
+        alibi_slopes: Optional[torch.Tensor],
+        k_scale: float,
+        v_scale: float,
+        tp_rank: int = 0,
+        blocksparse_local_blocks: int = 0,
+        blocksparse_vert_stride: int = 0,
+        blocksparse_block_size: int = 64,
+        blocksparse_head_sliding_step: int = 0,
+    ) -> torch.Tensor:
+        torch.vacc.paged_attention(query,key_cache,value_cache,block_tables,seq_lens,-1,output)
+        return output
+
+    @staticmethod
+    def forward_prefix(
+        query: torch.Tensor,
+        key: torch.Tensor,
+        value: torch.Tensor,
+        kv_cache_dtype: str,
+        key_cache: torch.Tensor,
+        value_cache: torch.Tensor,
+        block_tables: torch.Tensor,
+        query_start_loc: torch.Tensor,
+        seq_lens_tensor: torch.Tensor,
+        context_lens: torch.Tensor,
+        max_query_len: int,
+        alibi_slopes: Optional[torch.Tensor],
+        sliding_window: Optional[int],
+        k_scale: float,
+        v_scale: float,
+    ) -> torch.Tensor:
+        output = torch.empty_like(query)
+        context_attention_fwd(
+            query,
+            key,
+            value,
+            output,
+            kv_cache_dtype,
+            key_cache,
+            value_cache,
+            block_tables,
+            # query_start_loc is (batch_size + 1,)
+            query_start_loc[:-1],
+            seq_lens_tensor,
+            context_lens,
+            max_query_len,
+            k_scale,
+            v_scale,
+            alibi_slopes,
+            sliding_window,
+        )
+        return output
+
+    @staticmethod
+    def swap_blocks(
+        src_kv_cache: torch.Tensor,
+        dst_kv_cache: torch.Tensor,
+        src_to_dst: torch.Tensor,
+    ) -> None:
+        src_key_cache = src_kv_cache[0]
+        dst_key_cache = dst_kv_cache[0]
+        torch.vacc.swap_blocks(src_key_cache, dst_key_cache, src_to_dst)
+
+        src_value_cache = src_kv_cache[1]
+        dst_value_cache = dst_kv_cache[1]
+        torch.vacc.swap_blocks(src_value_cache, dst_value_cache, src_to_dst)
+
+    @staticmethod
+    def copy_blocks(
+        kv_caches: List[torch.Tensor],
+        src_to_dists: torch.Tensor,
+    ) -> None:
+        key_caches = [kv_cache[0] for kv_cache in kv_caches]
+        value_caches = [kv_cache[1] for kv_cache in kv_caches]
+        torch.vacc.copy_blocks(key_caches, value_caches, src_to_dists)

vllm_vacc/vllm/config.py

@@ -0,0 +1,154 @@
+# SPDX-License-Identifier: Apache-2.0
+
+import ast
+import copy
+import enum
+import hashlib
+import inspect
+import json
+import re
+import sys
+import textwrap
+import warnings
+from collections import Counter
+from contextlib import contextmanager
+from dataclasses import (MISSING, dataclass, field, fields, is_dataclass,
+                         replace)
+from importlib.util import find_spec
+from pathlib import Path
+from typing import (TYPE_CHECKING, Any, Callable, ClassVar, Final, Literal,
+                    Optional, Protocol, TypeVar, Union, get_args)
+
+import torch
+from pydantic import BaseModel, Field, PrivateAttr
+from torch.distributed import ProcessGroup, ReduceOp
+from transformers import PretrainedConfig
+
+import vllm.envs as envs
+from vllm.compilation.inductor_pass import CallableInductorPass, InductorPass
+from vllm.logger import init_logger
+from vllm.model_executor.layers.quantization import (QUANTIZATION_METHODS,
+                                                     QuantizationMethods,
+                                                     get_quantization_config)
+from vllm.model_executor.models import ModelRegistry
+from vllm.platforms import CpuArchEnum, current_platform
+from vllm.config.model import _STR_DTYPE_TO_TORCH_DTYPE
+
+
+logger = init_logger(__name__)
+
+
+def ModelConfig___verify_quantization(self) -> None:
+    supported_quantization = QUANTIZATION_METHODS
+    optimized_quantization_methods = [
+        "fp8",  "modelopt", "gptq_marlin_24", "gptq_marlin",
+        "awq_marlin", "fbgemm_fp8", "compressed-tensors", "experts_int8",
+        "quark", "modelopt_fp4", "bitblas"#, "gptq_bitblas"
+    ]
+    if self.quantization is not None:
+        self.quantization = self.quantization.lower()
+
+    # Parse quantization method from the HF model config, if available.
+    quant_cfg = self._parse_quant_hf_config(self.hf_config)
+    if quant_cfg is None and (text_config := getattr(
+                self.hf_config, "text_config", None)):
+        # Check the text config as well for multi-modal models.
+        quant_cfg = self._parse_quant_hf_config(text_config)
+            
+    if quant_cfg is not None:
+        quant_method = quant_cfg.get("quant_method", "").lower()
+        quant_method = quant_method.replace("compressed_tensors",
+                                            "compressed-tensors")
+        quant_cfg["quant_method"] = quant_method
+
+        # Quantization methods which are overrides (i.e. they have a
+        # `override_quantization_method` method) must be checked in order
+        # of preference (this is particularly important for GPTQ).
+        overrides = [
+            # "marlin",
+            "bitblas",
+            "gptq_marlin_24",
+            "gptq_marlin",
+            # "gptq_bitblas",
+            "awq_marlin",
+            "ipex",
+            "moe_wna16",
+            "modelopt",
+            "modelopt_fp4",
+            "petit_nvfp4",
+        ]
+        quantization_methods = [
+            q for q in supported_quantization if q not in overrides
+        ]
+        # Any custom overrides will be in quantization_methods so we place
+        # them at the start of the list so custom overrides have preference
+        # over the built in ones.
+        quantization_methods = quantization_methods + overrides
+
+        # Detect which checkpoint is it
+        for name in quantization_methods:
+            method = get_quantization_config(name)
+            quantization_override = method.override_quantization_method(
+                quant_cfg, self.quantization)
+            if quantization_override is not None:
+                # Raise error if the override is not custom (custom would
+                # be in QUANTIZATION_METHODS but not QuantizationMethods)
+                # and hasn't been added to the overrides list.
+                if (name in get_args(QuantizationMethods)
+                        and name not in overrides):
+                    raise ValueError(
+                        f"Quantization method {name} is an override but "
+                        "is has not been added to the `overrides` list "
+                        "above. This is necessary to ensure that the "
+                        "overrides are checked in order of preference.")
+                quant_method = quantization_override
+                self.quantization = quantization_override
+                break
+
+        # Verify quantization configurations.
+        if self.quantization is None:
+            self.quantization = quant_method
+        elif self.quantization != quant_method:
+            raise ValueError(
+                "Quantization method specified in the model config "
+                f"({quant_method}) does not match the quantization "
+                f"method specified in the `quantization` argument "
+                f"({self.quantization}).")
+
+    if self.quantization is not None:
+        if self.quantization not in supported_quantization:
+            raise ValueError(
+                f"Unknown quantization method: {self.quantization}. Must "
+                f"be one of {supported_quantization}.")
+        from vllm.platforms import current_platform
+        current_platform.verify_quantization(self.quantization)
+        if self.quantization not in optimized_quantization_methods:
+            logger.warning(
+                "%s quantization is not fully "
+                "optimized yet. The speed can be slower than "
+                "non-quantized models.", self.quantization)
+
+
+def _get_head_dtype(config: PretrainedConfig, dtype: torch.dtype,
+                    runner_type: str) -> torch.dtype:
+    head_dtype: Optional[Union[str,
+                               torch.dtype]] = getattr(config, "head_dtype",
+                                                       None)
+
+    if head_dtype == "model":
+        return dtype
+    elif isinstance(head_dtype, str):
+        head_dtype = head_dtype.lower()
+        if head_dtype not in _STR_DTYPE_TO_TORCH_DTYPE:
+            raise ValueError(f"Unknown dtype: {head_dtype!r}")
+        return _STR_DTYPE_TO_TORCH_DTYPE[head_dtype]
+    elif isinstance(head_dtype, torch.dtype):
+        return head_dtype
+    elif head_dtype is None:
+        if torch.float32 not in current_platform.supported_dtypes:
+            return dtype
+        if runner_type == "pooling":
+            return torch.float16
+        return dtype
+    else:
+        raise ValueError(f"Unknown dtype: {head_dtype}")

vllm_vacc/vllm/config_manager.py

@@ -0,0 +1,52 @@
+
+#####################################################
+##  1. use for Memory-Recycler
+##  .model_infos
+##      ['deepseek_mtp',]
+##
+##  2. waitting...
+######################################################
+
+import os
+class ConfigManager():
+    def __init__(self):
+        self._config_name = ".model_infos"
+
+    def update_model_infos(self, model_infos : str):
+        from pathlib import Path
+        workspace_path = Path.cwd()
+        
+        bootinfo_config = f'{workspace_path}/{self._config_name}'
+        try:
+            with open(bootinfo_config, 'w') as w:
+                w.write(model_infos)
+        except Exception as e:
+            print("[WARN] write model_infos fail, caused by ", e)
+            raise False
+
+    def get_model_infos(self):
+        from pathlib import Path
+        workspace_path = Path.cwd()
+        
+        bootinfo_config = f'{workspace_path}/{self._config_name}'
+        bootinfo_inited = os.path.exists(bootinfo_config)
+        
+        runner_model_infos = "default"
+        if bootinfo_inited:
+            try:
+                with open(bootinfo_config) as w:
+                    runner_model_infos = w.readline()
+            except Exception as e:
+                print("[WARN] model_infos load fail ", e)
+
+        return runner_model_infos
+    
+config_manager = None
+
+def vllm_vacc_config_manager():
+    global config_manager
+
+    if config_manager is None:
+        config_manager = ConfigManager()
+    return config_manager
+    

vllm_vacc/vllm/core/block/block_table.py

@@ -0,0 +1,407 @@
+# SPDX-License-Identifier: Apache-2.0
+
+import math
+from typing import List, Optional
+
+from vllm.core.block.common import BlockList
+from vllm.core.block.interfaces import Block, DeviceAwareBlockAllocator
+from vllm.utils import Device, cdiv, chunk_list
+
+
+class BlockTable:
+    """A class to manage blocks for a specific sequence.
+
+    The BlockTable maps a sequence of tokens to a list of blocks, where each
+    block represents a contiguous memory allocation for a portion of the 
+    sequence. The blocks are managed by a DeviceAwareBlockAllocator, which is
+    responsible for allocating and freeing memory for the blocks.
+
+    Args:
+        block_size (int): The maximum number of tokens that can be stored in a
+            single block.
+        block_allocator (DeviceAwareBlockAllocator): The block allocator used to
+            manage memory for the blocks.
+        _blocks (Optional[List[Block]], optional): An optional list of existing
+            blocks to initialize the BlockTable with. If not provided, an empty
+            BlockTable is created.
+        max_block_sliding_window (Optional[int], optional): The number of
+            blocks to keep around for each sequence. If None, all blocks
+            are kept (eg., when sliding window is not used).
+            It should at least fit the sliding window size of the model.
+
+    Attributes:
+        _block_size (int): The maximum number of tokens that can be stored in a
+            single block.
+        _allocator (DeviceAwareBlockAllocator): The block allocator used to
+            manage memory for the blocks.
+        _blocks (Optional[List[Block]]): The list of blocks managed by this
+            BlockTable.
+        _num_full_slots (int): The number of tokens currently stored in the
+            blocks.
+    """
+
+    def __init__(
+        self,
+        block_size: int,
+        block_allocator: DeviceAwareBlockAllocator,
+        _blocks: Optional[List[Block]] = None,
+        max_block_sliding_window: Optional[int] = None,
+    ):
+        self._block_size = block_size
+        self._allocator = block_allocator
+        if _blocks is None:
+            _blocks = []
+        self._blocks: BlockList = BlockList(_blocks)
+
+        self._max_block_sliding_window = max_block_sliding_window
+        self._num_full_slots = self._get_num_token_ids()
+
+    @staticmethod
+    def get_num_required_blocks(token_ids: List[int],
+                                block_size: int,
+                                num_lookahead_slots: int = 0) -> int:
+        """Calculates the minimum number of blocks required to store a given
+        sequence of token IDs along with any look-ahead slots that may be
+        required (like in multi-step + chunked-prefill).
+
+        This assumes worst-case scenario, where every block requires a new
+        allocation (e.g. ignoring prefix caching).
+
+        Args:
+            token_ids (List[int]): The sequence of token IDs to be stored.
+            block_size (int): The maximum number of tokens that can be stored in
+                a single block.
+            num_lookahead_slots (int): look-ahead slots that the sequence may
+                require.
+
+        Returns:
+            int: The minimum number of blocks required to store the given
+                sequence of token IDs along with any required look-ahead slots.
+        """
+        return cdiv(len(token_ids) + num_lookahead_slots, block_size)
+
+    def allocate(self,
+                 token_ids: List[int],
+                 device: Device = Device.GPU,
+                 extra_hash: Optional[int] = None,
+                 seq_id: Optional[int] = None) -> None:
+        """Allocates memory blocks for storing the given sequence of token IDs.
+
+        This method allocates the required number of blocks to store the given
+        sequence of token IDs.
+
+        Args:
+            token_ids (List[int]): The sequence of token IDs to be stored.
+            device (Device, optional): The device on which the blocks should be
+                allocated. Defaults to Device.GPU.
+            extra_hash (Optional[int]): The hash value of additional
+                factors, such as adapters, that influence the block hash
+                in the prefixcaching block.
+        """
+        assert not self._is_allocated
+        assert token_ids
+        blocks = self._allocate_blocks_for_token_ids(prev_block=None,
+                                                     token_ids=token_ids,
+                                                     device=device,
+                                                     extra_hash=extra_hash,
+                                                     seq_id=seq_id)
+        self.update(blocks)
+        self._num_full_slots = len(token_ids)
+
+    def update(self, blocks: List[Block]) -> None:
+        """Resets the table to the newly provided blocks 
+        (with their corresponding block ids)
+        """
+        self._blocks.update(blocks)
+
+    def append_token_ids(self,
+                         token_ids: List[int],
+                         num_lookahead_slots: int = 0,
+                         num_computed_slots: Optional[int] = None,
+                         extra_hash: Optional[int] = None,
+                         seq_id: Optional[int] = None) -> None:
+        """Appends a sequence of token IDs to the existing blocks in the
+        BlockTable.
+
+        This method appends the given sequence of token IDs to the existing
+        blocks in the BlockTable. If there is not enough space in the existing
+        blocks, new blocks are allocated using the `ensure_num_empty_slots`
+        method to accommodate the additional tokens.
+
+        The token IDs are divided into chunks of size `block_size` (except for
+        the first chunk, which may be smaller), and each chunk is appended to a
+        separate block.
+
+        Args:
+            token_ids (List[int]): The sequence of token IDs to be appended.
+            num_computed_slots (Optional[int]): The number of KV cache slots
+                that are already filled (computed).
+                When sliding window is enabled, this is used to compute how many
+                blocks to drop at the front of the sequence.
+                Without sliding window, None can be passed.
+                Without chunked prefill, it should be the same as
+                _num_full_slots.
+            extra_hash (Optional[int]): The hash value of additional
+                factors such as adapters that influence the block, apart
+                from the token_ids.
+        """
+        assert self._is_allocated, "no blocks have been allocated"
+        assert len(self._blocks) > 0
+
+        # Drop blocks that are no longer needed due to sliding window
+        if self._max_block_sliding_window is not None:
+            null_block = self._allocator.allocate_or_get_null_block()
+            assert num_computed_slots is not None
+            end_block_idx = (num_computed_slots //
+                             self._block_size) - self._max_block_sliding_window
+            for idx in range(0, end_block_idx):
+                b = self._blocks[idx]
+                if b is not null_block:
+                    self._allocator.free(b)
+                    self._blocks[idx] = null_block
+
+        # Ensure there are enough empty slots for the new tokens plus
+        # lookahead slots
+        self.ensure_num_empty_slots(num_empty_slots=len(token_ids) +
+                                    num_lookahead_slots,
+                                    extra_hash=extra_hash,
+                                    seq_id=seq_id)
+
+        # Update the blocks with the new tokens
+        first_block_idx = self._num_full_slots // self._block_size
+        token_blocks = self._chunk_token_blocks_for_append(token_ids)
+
+        for i, token_block in enumerate(token_blocks):
+            self._blocks.append_token_ids(first_block_idx + i, token_block, seq_id=seq_id)
+
+        self._num_full_slots += len(token_ids)
+
+    def ensure_num_empty_slots(self,
+                               num_empty_slots: int,
+                               extra_hash: Optional[int] = None,
+                               seq_id: Optional[int] = None) -> None:
+        """Ensures that the BlockTable has at least the specified number of
+        empty slots available.
+
+        This method checks if the BlockTable has enough empty slots (i.e.,
+        available space) to accommodate the requested number of tokens. If not,
+        it allocates additional blocks on the GPU to ensure that the required
+        number of empty slots is available.
+
+        Args:
+            num_empty_slots (int): The minimum number of empty slots required.
+            extra_hash (Optional[int]): The hash value of additional
+                factors such as adapters that influence the block, apart
+                from the token_ids.
+        """
+        # Currently the block table only supports
+        # appending tokens to GPU blocks.
+        device = Device.GPU
+        assert self._is_allocated
+
+        if self._num_empty_slots >= num_empty_slots:
+            return
+
+        slots_to_allocate = num_empty_slots - self._num_empty_slots
+        blocks_to_allocate = cdiv(slots_to_allocate, self._block_size)
+
+        for _ in range(blocks_to_allocate):
+            assert len(self._blocks) > 0
+            self._blocks.append(
+                self._allocator.allocate_mutable_block(
+                    prev_block=self._blocks[-1],
+                    device=device,
+                    extra_hash=extra_hash,
+                    seq_id=seq_id))
+
+    def fork(self) -> "BlockTable":
+        """Creates a new BlockTable instance with a copy of the blocks from the
+        current instance.
+
+        This method creates a new BlockTable instance with the same block size,
+        block allocator, and a copy of the blocks from the current instance. The
+        new BlockTable has its own independent set of blocks, but shares the
+        same underlying memory allocation with the original BlockTable.
+
+        Returns:
+            BlockTable: A new BlockTable instance with a copy of the blocks from
+                the current instance.
+        """
+        assert self._is_allocated
+        assert len(self._blocks) > 0
+        forked_blocks = self._allocator.fork(self._blocks[-1])
+        return BlockTable(
+            block_size=self._block_size,
+            block_allocator=self._allocator,
+            _blocks=forked_blocks,
+            max_block_sliding_window=self._max_block_sliding_window,
+        )
+
+    def free(self, seq_id: Optional[int] = None) -> None:
+        """Frees the memory occupied by the blocks in the BlockTable.
+
+        This method iterates over all the blocks in the `_blocks` list and calls
+        the `free` method of the `_allocator` object to release the memory
+        occupied by each block. After freeing all the blocks, the `_blocks` list
+        is set to `None`.
+        """
+        self.blocks.reverse()
+        for block in self.blocks:
+            self._allocator.free(block, seq_id=seq_id)
+        self._blocks.reset()
+
+    @property
+    def physical_block_ids(self) -> List[int]:
+        """Returns a list of physical block indices for the blocks in the
+        BlockTable.
+
+        This property returns a list of integers, where each integer represents
+        the physical block index of a corresponding block in the `_blocks` list.
+        The physical block index is a unique identifier for the memory location
+        occupied by the block.
+
+        Returns:
+            List[int]: A list of physical block indices for the blocks in the
+                BlockTable.
+        """
+        return self._blocks.ids()
+
+    def get_unseen_token_ids(self, sequence_token_ids: List[int]) -> List[int]:
+        """Get the number of "unseen" tokens in the sequence.
+
+        Unseen tokens are tokens in the sequence corresponding to this block
+        table, but are not yet appended to this block table.
+
+        Args:
+            sequence_token_ids (List[int]): The list of token ids in the
+                sequence.
+
+        Returns:
+            List[int]: The postfix of sequence_token_ids that has not yet been
+                appended to the block table.
+        """
+
+        # Since the block table is append-only, the unseen token ids are the
+        # ones after the appended ones.
+        return sequence_token_ids[self.num_full_slots:]
+
+    def _allocate_blocks_for_token_ids(
+            self,
+            prev_block: Optional[Block],
+            token_ids: List[int],
+            device: Device,
+            extra_hash: Optional[int] = None,
+            seq_id: Optional[int] = None) -> List[Block]:
+        blocks: List[Block] = []
+
+        block_token_ids = []
+        tail_token_ids = []
+        for cur_token_ids in chunk_list(token_ids, self._block_size):
+            if len(cur_token_ids) == self._block_size:
+                block_token_ids.append(cur_token_ids)
+            else:
+                tail_token_ids.append(cur_token_ids)
+
+        if block_token_ids:
+            blocks.extend(
+                self._allocator.allocate_immutable_blocks(
+                    prev_block,
+                    block_token_ids=block_token_ids,
+                    device=device,
+                    extra_hash=extra_hash,
+                    seq_id=seq_id))
+            prev_block = blocks[-1]
+
+        if tail_token_ids:
+            assert len(tail_token_ids) == 1
+            cur_token_ids = tail_token_ids[0]
+
+            block = self._allocator.allocate_mutable_block(
+                prev_block=prev_block, device=device, extra_hash=extra_hash, seq_id=seq_id)
+            block.append_token_ids(cur_token_ids, seq_id)
+
+            blocks.append(block)
+
+        return blocks
+
+    def _get_all_token_ids(self) -> List[int]:
+        # NOTE: This function is O(seq_len); use sparingly.
+        token_ids: List[int] = []
+
+        if not self._is_allocated:
+            return token_ids
+
+        for block in self.blocks:
+            token_ids.extend(block.token_ids)
+
+        return token_ids
+
+    def _get_num_token_ids(self) -> int:
+        res = 0
+        for block in self.blocks:
+            res += len(block.token_ids)
+
+        return res
+
+    @property
+    def _is_allocated(self) -> bool:
+        return len(self._blocks) > 0
+
+    @property
+    def blocks(self) -> List[Block]:
+        return self._blocks.list()
+
+    @property
+    def _num_empty_slots(self) -> int:
+        assert self._is_allocated
+        return len(self._blocks) * self._block_size - self._num_full_slots
+
+    @property
+    def num_full_slots(self) -> int:
+        """Returns the total number of tokens currently stored in the
+        BlockTable.
+
+        Returns:
+            int: The total number of tokens currently stored in the BlockTable.
+        """
+        return self._num_full_slots
+
+    def get_num_blocks_touched_by_append_slots(
+            self, token_ids: List[int], num_lookahead_slots: int) -> int:
+        """Determine how many blocks will be "touched" by appending the token
+        ids.
+
+        This is required for the scheduler to determine whether a sequence can
+        continue generation, or if it must be preempted.
+        """
+        # Math below is equivalent to:
+        # all_token_ids = token_ids + [-1] * num_lookahead_slots
+        # token_blocks = self._chunk_token_blocks_for_append(all_token_ids)
+        # return len(token_blocks)
+
+        num_token_ids = len(token_ids) + num_lookahead_slots
+        first_chunk_size = self._block_size - (self._num_full_slots %
+                                               self._block_size)
+        num_token_blocks = (1 + math.ceil(
+            (num_token_ids - first_chunk_size) / self._block_size))
+        return num_token_blocks
+
+    def _chunk_token_blocks_for_append(
+            self, token_ids: List[int]) -> List[List[int]]:
+        """Split the token ids into block-sized chunks so they can be easily
+        appended to blocks. The first such "token block" may have less token ids
+        than the block size, since the last allocated block may be partially
+        full.
+
+        If no token ids are provided, then no chunks are returned.
+        """
+
+        if not token_ids:
+            return []
+
+        first_chunk_size = self._block_size - (self._num_full_slots %
+                                               self._block_size)
+        token_blocks = [token_ids[:first_chunk_size]]
+        token_blocks.extend(
+            chunk_list(token_ids[first_chunk_size:], self._block_size))
+        return token_blocks

vllm_vacc/vllm/core/block/common.py

@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: Apache-2.0
+
+from collections import deque
+from dataclasses import dataclass
+from typing import Deque, Dict, Iterable, List, Optional, Protocol, Tuple
+
+from vllm.core.block.interfaces import Block, BlockAllocator
+
+BlockId = int
+RefCount = int
+
+class BlockList:
+    def append_token_ids(self, block_index: int, token_ids: List[int], seq_id: Optional[int]=None) -> None:
+        block = self._blocks[block_index]
+        prev_block_id = block.block_id
+
+        block.append_token_ids(token_ids, seq_id=seq_id)
+
+        # CoW or promotion may update the internal block_id
+        if prev_block_id != block.block_id:
+            self._update_block_id(block_index, block.block_id)

vllm_vacc/vllm/core/block/cpu_gpu_block_allocator.py

@@ -0,0 +1,373 @@
+# SPDX-License-Identifier: Apache-2.0
+
+from typing import Dict, FrozenSet, List, Optional, Tuple
+
+from vllm.core.block.interfaces import (Block, BlockAllocator, BlockId,
+                                        DeviceAwareBlockAllocator)
+# from vllm.core.block.naive_block import NaiveBlock, NaiveBlockAllocator
+from vllm.core.block.naive_block import NaiveBlock
+from vllm_vacc.vllm.core.block.naive_block import NaiveBlockAllocator
+from vllm_vacc.vllm.core.block.prefix_caching_block import PrefixCachingBlockAllocator
+from vllm.platforms import current_platform
+from vllm.utils import Device
+
+from vllm.core.block.cpu_gpu_block_allocator import NullBlock
+
+class CpuGpuBlockAllocator(DeviceAwareBlockAllocator):
+    """A block allocator that can allocate blocks on both CPU and GPU memory.
+
+    This class implements the `DeviceAwareBlockAllocator` interface and provides
+    functionality for allocating and managing blocks of memory on both CPU and
+    GPU devices.
+
+    The `CpuGpuBlockAllocator` maintains separate memory pools for CPU and GPU
+    blocks, and allows for allocation, deallocation, forking, and swapping of
+    blocks across these memory pools.
+    """
+
+    @staticmethod
+    def create(
+        allocator_type: str,
+        num_gpu_blocks: int,
+        num_cpu_blocks: int,
+        block_size: int,
+    ) -> DeviceAwareBlockAllocator:
+        """Creates a CpuGpuBlockAllocator instance with the specified
+        configuration.
+
+        This static method creates and returns a CpuGpuBlockAllocator instance
+        based on the provided parameters. It initializes the CPU and GPU block
+        allocators with the specified number of blocks, block size, and
+        allocator type.
+
+        Args:
+            allocator_type (str): The type of block allocator to use for CPU
+                and GPU blocks. Currently supported values are "naive" and
+                "prefix_caching".
+            num_gpu_blocks (int): The number of blocks to allocate for GPU
+                memory.
+            num_cpu_blocks (int): The number of blocks to allocate for CPU
+                memory.
+            block_size (int): The size of each block in number of tokens.
+
+        Returns:
+            DeviceAwareBlockAllocator: A CpuGpuBlockAllocator instance with the
+                specified configuration.
+
+        Notes:
+            - The block IDs are assigned contiguously, with GPU block IDs coming
+                before CPU block IDs.
+        """
+        # For HPU, block id 0 is used only for padding
+        reserved_blocks = 1 if current_platform.is_hpu() else 0
+        block_ids = list(
+            range(reserved_blocks, num_gpu_blocks + num_cpu_blocks))
+        num_gpu_blocks -= reserved_blocks
+        gpu_block_ids = block_ids[:num_gpu_blocks]
+        cpu_block_ids = block_ids[num_gpu_blocks:]
+
+        if allocator_type == "naive":
+            gpu_allocator: BlockAllocator = NaiveBlockAllocator(
+                create_block=NaiveBlock,  # type: ignore
+                num_blocks=num_gpu_blocks,
+                block_size=block_size,
+                block_ids=gpu_block_ids,
+            )
+
+            cpu_allocator: BlockAllocator = NaiveBlockAllocator(
+                create_block=NaiveBlock,  # type: ignore
+                num_blocks=num_cpu_blocks,
+                block_size=block_size,
+                block_ids=cpu_block_ids,
+            )
+        elif allocator_type == "prefix_caching":
+            gpu_allocator = PrefixCachingBlockAllocator(
+                num_blocks=num_gpu_blocks,
+                block_size=block_size,
+                block_ids=gpu_block_ids,
+            )
+
+            cpu_allocator = PrefixCachingBlockAllocator(
+                num_blocks=num_cpu_blocks,
+                block_size=block_size,
+                block_ids=cpu_block_ids,
+            )
+        else:
+            raise ValueError(f"Unknown allocator type {allocator_type=}")
+
+        return CpuGpuBlockAllocator(
+            cpu_block_allocator=cpu_allocator,
+            gpu_block_allocator=gpu_allocator,
+        )
+
+    def __init__(self, cpu_block_allocator: BlockAllocator,
+                 gpu_block_allocator: BlockAllocator):
+        assert not (
+            cpu_block_allocator.all_block_ids
+            & gpu_block_allocator.all_block_ids
+        ), "cpu and gpu block allocators can't have intersection of block ids"
+
+        self._allocators = {
+            Device.CPU: cpu_block_allocator,
+            Device.GPU: gpu_block_allocator,
+        }
+
+        self._swap_mapping: Dict[int, int] = {}
+        self._null_block: Optional[Block] = None
+
+        self._block_ids_to_allocator: Dict[int, BlockAllocator] = {}
+        for _, allocator in self._allocators.items():
+            for block_id in allocator.all_block_ids:
+                self._block_ids_to_allocator[block_id] = allocator
+
+    def allocate_or_get_null_block(self) -> Block:
+        if self._null_block is None:
+            self._null_block = NullBlock(
+                self.allocate_mutable_block(None, Device.GPU))
+        return self._null_block
+
+    def allocate_mutable_block(self,
+                               prev_block: Optional[Block],
+                               device: Device,
+                               extra_hash: Optional[int] = None,
+                               seq_id: Optional[int] = None) -> Block:
+        """Allocates a new mutable block on the specified device.
+
+        Args:
+            prev_block (Optional[Block]): The previous block to in the sequence.
+                Used for prefix hashing.
+            device (Device): The device on which to allocate the new block.
+            extra_hash (Optional[int]): The hash value of additional
+                factors, such as adapters, that influence the block hash
+                in the prefix caching block.
+
+        Returns:
+            Block: The newly allocated mutable block.
+        """
+        return self._allocators[device].allocate_mutable_block(
+            prev_block, extra_hash=extra_hash, seq_id=seq_id)
+
+    def allocate_immutable_blocks(
+            self,
+            prev_block: Optional[Block],
+            block_token_ids: List[List[int]],
+            device: Device,
+            extra_hash: Optional[int] = None,
+            seq_id: Optional[int] = None) -> List[Block]:
+        """Allocates a new group of immutable blocks with the provided block 
+        token IDs on the specified device.
+
+        Args:
+            prev_block (Optional[Block]): The previous block in the sequence.
+                Used for prefix hashing.
+            block_token_ids (List[int]): The list of block token IDs to be 
+                stored in the new blocks.
+            device (Device): The device on which to allocate the new block.
+            extra_hash (Optional[int]): The hash value of additional
+                factors, such as adapters, that influence the block hash
+                in the prefix caching block.
+
+        Returns:
+            List[Block]: The newly allocated list of immutable blocks 
+                containing the provided block token IDs.
+        """
+        return self._allocators[device].allocate_immutable_blocks(
+            prev_block, block_token_ids, extra_hash=extra_hash, seq_id=seq_id)
+
+    def allocate_immutable_block(self,
+                                 prev_block: Optional[Block],
+                                 token_ids: List[int],
+                                 device: Device,
+                                 extra_hash: Optional[int] = None) -> Block:
+        """Allocates a new immutable block with the provided token IDs on the
+        specified device.
+
+        Args:
+            prev_block (Optional[Block]): The previous block in the sequence.
+                Used for prefix hashing.
+            token_ids (List[int]): The list of token IDs to be stored in the new
+                block.
+            device (Device): The device on which to allocate the new block.
+            extra_hash (Optional[int]): The hash value of additional
+                factors, such as adapters, that influence the block hash
+                in the prefix caching block.
+
+        Returns:
+            Block: The newly allocated immutable block containing the provided
+                token IDs.
+        """
+        return self._allocators[device].allocate_immutable_block(
+            prev_block, token_ids, extra_hash=extra_hash)
+
+    def free(self, block: Block, seq_id: Optional[int] = None) -> None:
+        """Frees the memory occupied by the given block.
+
+        Args:
+            block (Block): The block to be freed.
+        """
+        # Null block should never be freed
+        if isinstance(block, NullBlock):
+            return
+        block_id = block.block_id
+        assert block_id is not None
+        allocator = self._block_ids_to_allocator[block_id]
+        allocator.free(block, seq_id=seq_id)
+
+    def fork(self, last_block: Block) -> List[Block]:
+        """Creates a new sequence of blocks that shares the same underlying
+            memory as the original sequence.
+
+        Args:
+            last_block (Block): The last block in the original sequence.
+
+        Returns:
+            List[Block]: A new list of blocks that shares the same memory as the
+                original sequence.
+        """
+        # do not attempt to fork the null block
+        assert not isinstance(last_block, NullBlock)
+        block_id = last_block.block_id
+        assert block_id is not None
+        allocator = self._block_ids_to_allocator[block_id]
+        return allocator.fork(last_block)
+
+    def get_num_free_blocks(self, device: Device, seq_id: int=None) -> int:
+        """Returns the number of free blocks available on the specified device.
+
+        Args:
+            device (Device): The device for which to query the number of free
+                blocks. AssertionError is raised if None is passed.
+
+        Returns:
+            int: The number of free blocks available on the specified device.
+        """
+        return self._allocators[device].get_num_free_blocks(seq_id=seq_id)
+
+    def get_num_total_blocks(self, device: Device, seq_id: int=None) -> int:
+        return self._allocators[device].get_num_total_blocks(seq_id=seq_id)
+
+    def get_physical_block_id(self, device: Device, absolute_id: int) -> int:
+        """Returns the zero-offset block id on certain device given the 
+        absolute block id.
+
+        Args:
+            device (Device): The device for which to query relative block id.
+                absolute_id (int): The absolute block id for the block in 
+                whole allocator.
+
+        Returns:
+            int: The zero-offset block id on certain device.
+        """
+        return self._allocators[device].get_physical_block_id(absolute_id)
+
+    def swap(self, blocks: List[Block], src_device: Device,
+             dst_device: Device) -> Dict[int, int]:
+        """Execute the swap for the given blocks from source_device
+        on to dest_device, save the current swap mapping and append 
+        them to the accumulated `self._swap_mapping` for each 
+        scheduling move.
+
+        Args:
+            blocks: List of blocks to be swapped.
+            src_device (Device): Device to swap the 'blocks' from.
+            dst_device (Device): Device to swap the 'blocks' to.
+        
+        Returns:
+            Dict[int, int]: Swap mapping from source_device
+                on to dest_device.
+        """
+        src_block_ids = [block.block_id for block in blocks]
+        self._allocators[src_device].swap_out(blocks)
+        self._allocators[dst_device].swap_in(blocks)
+        dst_block_ids = [block.block_id for block in blocks]
+
+        current_swap_mapping: Dict[int, int] = {}
+        for src_block_id, dst_block_id in zip(src_block_ids, dst_block_ids):
+            if src_block_id is not None and dst_block_id is not None:
+                self._swap_mapping[src_block_id] = dst_block_id
+                current_swap_mapping[src_block_id] = dst_block_id
+        return current_swap_mapping
+
+    def get_num_full_blocks_touched(self, blocks: List[Block],
+                                    device: Device) -> int:
+        """Returns the number of full blocks that will be touched by
+        swapping in/out the given blocks on to the 'device'.
+
+        Args:
+            blocks: List of blocks to be swapped.
+            device (Device): Device to swap the 'blocks' on.
+
+        Returns:
+            int: the number of full blocks that will be touched by
+                swapping in/out the given blocks on to the 'device'.
+                Non full blocks are ignored when deciding the number
+                of blocks to touch.
+        """
+        return self._allocators[device].get_num_full_blocks_touched(blocks)
+
+    def clear_copy_on_writes(self, seq_id: Optional[int] = None) -> List[Tuple[int, int]]:
+        """Clears the copy-on-write (CoW) state and returns the mapping of
+            source to destination block IDs.
+
+        Returns:
+            List[Tuple[int, int]]: A list mapping source block IDs to 
+                destination block IDs.
+        """
+        # CoW only supported on GPU
+        device = Device.GPU
+        return self._allocators[device].clear_copy_on_writes()
+
+    def mark_blocks_as_accessed(self, block_ids: List[int],
+                                now: float) -> None:
+        """Mark blocks as accessed, only use for prefix caching."""
+        # Prefix caching only supported on GPU.
+        device = Device.GPU
+        return self._allocators[device].mark_blocks_as_accessed(block_ids, now)
+
+    def mark_blocks_as_computed(self, block_ids: List[int]) -> None:
+        """Mark blocks as accessed, only use for prefix caching."""
+        # Prefix caching only supported on GPU.
+        device = Device.GPU
+        return self._allocators[device].mark_blocks_as_computed(block_ids)
+
+    def get_common_computed_block_ids(
+            self, computed_seq_block_ids: List[List[int]]) -> List[int]:
+        # Prefix caching only supported on GPU.
+        device = Device.GPU
+        return self._allocators[device].get_common_computed_block_ids(
+            computed_seq_block_ids)
+
+    @property
+    def all_block_ids(self) -> FrozenSet[int]:
+        return frozenset(self._block_ids_to_allocator.keys())
+
+    def get_prefix_cache_hit_rate(self, device: Device) -> float:
+        """Prefix cache hit rate. -1 means not supported or disabled."""
+        assert device in self._allocators
+        return self._allocators[device].get_prefix_cache_hit_rate()
+
+    def reset_prefix_cache(self) -> bool:
+        """Reset prefix cache for all devices."""
+        success = True
+        for allocator in self._allocators.values():
+            success = success and allocator.reset_prefix_cache()
+        return success
+
+    def get_and_reset_swaps(self) -> List[Tuple[int, int]]:
+        """Returns and clears the mapping of source to destination block IDs.
+        Will be called after every swapping operations for now, and after every
+        schedule when BlockManagerV2 become default. Currently not useful.
+
+        Returns:
+            List[Tuple[int, int]]: A mapping of source to destination block IDs.
+        """
+        mapping = self._swap_mapping.copy()
+        self._swap_mapping.clear()
+        return list(mapping.items())
+
+    def find_cached_blocks_prefix(
+        self,
+        block_hashes: List[int],
+        device: Device = Device.GPU,
+    ) -> List[int]:
+        return self._allocators[device].find_cached_blocks_prefix(block_hashes)

vllm_vacc/vllm/core/block/naive_block.py

@@ -0,0 +1,464 @@
+# SPDX-License-Identifier: Apache-2.0
+
+from collections import deque
+from typing import Deque, FrozenSet, Iterable, List, Optional, Tuple, Union
+
+from vllm.core.block.common import (BlockPool, CopyOnWriteTracker, RefCounter,
+                                    get_all_blocks_recursively)
+from vllm.core.block.interfaces import Block, BlockAllocator, BlockId, Device
+
+from typing import Dict
+from vllm.logger import init_logger
+import os
+
+max_seq_num = int(os.getenv("MAX_SEQ_NUM", 4))
+from vllm_vacc.vllm.model_executor.models.vars import BLOCK_GROUP_SIZE as env_blk_grp_size
+
+Refcount = int
+
+logger = init_logger(__name__)
+
+class NaiveBlockAllocator(BlockAllocator):
+    """A simple block allocator that manages blocks of memory without prefix
+    caching.
+
+    Args:
+        create_block (Block.Factory): A factory function for creating new
+            blocks. This is used when a NaiveBlockAllocator is composed within
+            a prefix caching allocator -- the naive block allocator must
+            construct prefix caching blocks (but shouldn't know anything else
+            about them).
+        num_blocks (int): The total number of blocks to manage.
+        block_size (int): The size of each block in tokens.
+        block_ids (Optional[Iterable[int]], optional): An optional iterable of
+            block IDs. If not provided, block IDs will be assigned sequentially
+            from 0 to num_blocks - 1.
+    """
+
+    def __init__(
+        self,
+        create_block: Block.Factory,
+        num_blocks: int,
+        block_size: int,
+        block_ids: Optional[Iterable[int]] = None,
+        block_pool: Optional[BlockPool] = None,
+    ):
+        # new mapping seqid : block_group_id
+        self.is_partitioned = False
+        self.num_blocks = num_blocks
+        self.seq_mapping: Dict[int, List[int]] = {}
+
+        if block_ids is None:
+            block_ids = range(num_blocks)
+
+        self._free_block_indices_all: Deque[BlockId] = deque(block_ids)
+        self._all_block_indices = frozenset(block_ids)
+        assert len(self._all_block_indices) == num_blocks
+
+        self._refcounter = RefCounter(
+            all_block_indices=self._free_block_indices_all)
+        self._block_size = block_size
+
+        self._cow_tracker = CopyOnWriteTracker(
+            refcounter=self._refcounter.as_readonly())
+
+        if block_pool is None:
+            extra_factor = 4
+            # Pre-allocate "num_blocks * extra_factor" block objects.
+            # The "* extra_factor" is a buffer to allow more block objects
+            # than physical blocks
+            self._block_pool = BlockPool(self._block_size, create_block, self,
+                                         num_blocks * extra_factor)
+        else:
+            # In this case, the block pool is provided by the caller,
+            # which means that there is most likely a need to share
+            # a block pool between allocators
+            self._block_pool = block_pool
+
+        # partition blocks to block groups
+        self.partition_blocks()
+
+    def allocate_immutable_block(self,
+                                 prev_block: Optional[Block],
+                                 token_ids: List[int],
+                                 extra_hash: Optional[int] = None,
+                                 device: Optional[Device] = None) -> Block:
+        """Allocates a new immutable block with the given token IDs, linked to
+        the previous block.
+
+        Args:
+            prev_block (Optional[Block]): The previous block in the sequence. If
+                None, then the block to be allocated is the first block in the
+                sequence.
+            token_ids (List[int]): The token IDs to be stored in the new block.
+
+        Returns:
+            Block: The newly allocated immutable block.
+        """
+        assert device is None
+        block = self.allocate_mutable_block(prev_block=prev_block)
+        block.append_token_ids(token_ids)
+        return block
+
+    def allocate_immutable_blocks(
+            self,
+            prev_block: Optional[Block],
+            block_token_ids: List[List[int]],
+            extra_hash: Optional[int] = None,
+            device: Optional[Device] = None,
+            seq_id: Optional[int] = None) -> List[Block]:
+        assert device is None
+        num_blocks = len(block_token_ids)
+
+        block_ids = []
+        for i in range(num_blocks):
+            block_ids.append(self._allocate_block_id(seq_id=seq_id))
+
+        blocks = []
+        for i in range(num_blocks):
+            prev_block = self._block_pool.init_block(
+                prev_block=prev_block,
+                token_ids=block_token_ids[i],
+                block_size=self._block_size,
+                physical_block_id=block_ids[i])
+            blocks.append(prev_block)
+
+        return blocks
+
+    def allocate_mutable_block(self,
+                               prev_block: Optional[Block],
+                               extra_hash: Optional[int] = None,
+                               device: Optional[Device] = None,
+                               seq_id: Optional[int] = None) -> Block:
+        """Allocates a new mutable block, linked to the previous block.
+
+        Args:
+            prev_block (Optional[Block]): The previous block in the sequence. If
+                None, then the block to be allocated is the first block in the
+                sequence.
+
+        Returns:
+            Block: The newly allocated mutable block.
+        """
+        assert device is None
+        assert seq_id is not None
+        block_id = self._allocate_block_id(seq_id)
+        block = self._block_pool.init_block(prev_block=prev_block,
+                                            token_ids=[],
+                                            block_size=self._block_size,
+                                            physical_block_id=block_id)
+        return block
+
+    def _allocate_block_id(self, seq_id: Optional[int] = None) -> BlockId:
+        assert seq_id is not None
+        # always use the lastest grp id to allocate
+        # since the previous grps are exausted
+        grp_id_list = self.get_group_list(seq_id)
+        if len(grp_id_list) == 0 or len(self._free_block_indices[grp_id_list[-1]]) == 0:
+            if not self._free_block_grp_indices:
+                # no more block id in block group pool
+                # should not reach here
+                raise False
+                # raise BlockAllocator.NoFreeBlocksError()
+            else:
+                # pop a new block and add to seq_mapping
+                grp_id = self._free_block_grp_indices.popleft()
+                grp_id_list.append(grp_id)
+                self.seq_mapping[seq_id] = grp_id_list
+        grp_id = grp_id_list[-1]
+        block_id = self._free_block_indices[grp_id].popleft()
+        self._refcounter.incr(block_id)
+        return block_id
+
+    def _free_block_id(self, block: Union[Block, BlockId], seq_id: Optional[int] = None) -> None:
+        assert seq_id is not None
+        grp_id_list = self.get_group_list(seq_id)
+        if isinstance(block, Block):
+            block_id = block.block_id
+            block.block_id = None
+        else:
+            block_id = block
+        assert block_id is not None
+
+        # block_id should always be in grp_id_list[0]
+        # since the block id is freed in block id order
+        grp_id = grp_id_list[-1]
+        assert block_id in self._block_grp_indices[grp_id], f"grp_id: {grp_id} block_id:{block_id}"
+
+        refcount = self._refcounter.decr(block_id)
+        if refcount == 0:
+            self._free_block_indices[grp_id].appendleft(block_id)
+            if len(self._free_block_indices[grp_id]) == len(self._block_grp_indices[grp_id]):
+                # free group
+                self.seq_mapping[seq_id].remove(grp_id)
+                if len(self.seq_mapping[seq_id]) == 0:
+                    # free seq_id
+                    del self.seq_mapping[seq_id]
+                # collect back to block group pool
+                self._free_block_grp_indices.appendleft(grp_id)
+
+    def free(self, block: Block, keep_block_object: bool = False, seq_id: Optional[int] = None) -> None:
+        # Release the physical block id
+        self._free_block_id(block, seq_id=seq_id)
+
+        # Release the block object
+        if not keep_block_object:
+            self._block_pool.free_block(block)
+
+    def free_block_id(self, block_id: BlockId, seq_id: Optional[int] = None) -> None:
+        assert seq_id is not None
+        self._free_block_id(block_id, seq_id)
+
+    def fork(self, last_block: Block, seq_id: Optional[int] = None) -> List[Block]:
+        """Creates a new sequence of blocks that shares the same underlying
+        memory as the original sequence.
+
+        Args:
+            last_block (Block): The last block in the original sequence.
+
+        Returns:
+            List[Block]: The new sequence of blocks that shares the same memory
+                as the original sequence.
+        """
+        source_blocks = get_all_blocks_recursively(last_block)
+
+        forked_blocks: List[Block] = []
+        prev_block = None
+        grp_id_list = self.get_group_list(seq_id)
+        for block in source_blocks:
+            # Increment refcount for each block.
+            assert block.block_id is not None
+            grp_id = self.get_group_id(block.block_id, grp_id_list)
+            assert grp_id != -1, "can't locate block group"
+            refcount = self._refcounter.incr(block.block_id)
+            assert refcount != 1, "can't fork free'd block"
+
+            forked_block = self._block_pool.init_block(
+                prev_block=prev_block,
+                token_ids=block.token_ids,
+                block_size=self._block_size,
+                physical_block_id=block.block_id)
+
+            forked_blocks.append(forked_block)
+            prev_block = forked_blocks[-1]
+
+        return forked_blocks
+
+    def partition_blocks(self) -> None:
+        # only parition once in each vllm server lifecycle
+        if self.is_partitioned: #and len(self.seq_mapping) > 0:
+            return
+        
+        self.is_partitioned = True
+        self._blk_num_per_grp = env_blk_grp_size // self._block_size
+        self._all_blk_grp_num = self.num_blocks // self._blk_num_per_grp
+
+        block_groups = []
+        for i in range(self._all_blk_grp_num):
+            start = i * self._blk_num_per_grp
+            block_groups.append([k for k in range(start, start + self._blk_num_per_grp)])
+        
+        self._free_block_grp_indices: Deque[BlockId] = deque(range(self._all_blk_grp_num))
+        # self._free_block_grp_indices: Deque[BlockId] = deque(range(self._all_blk_grp_num-1,-1,-1))
+        self._free_block_indices: List[Deque[BlockId]] = [deque(block_ids) for block_ids in block_groups]
+        self._block_grp_indices: List[FrozenSet] = [frozenset(block_ids) for block_ids in block_groups]
+        # self._all_block_indices =[frozenset(block_ids) for block_ids in block_groups]
+
+    # get group id list according to block_id
+    def get_group_id(self, block_id, grp_id_list) -> int:
+        for i in grp_id_list:
+            if block_id in self._block_grp_indices[i]:
+                return i
+        assert False
+        # return -1
+
+    # get group id list according to seq_id
+    def get_group_list(self, seq_id) -> int:
+        """Get group id list acoording to current seq_id
+            key: seq_id, value: [grp_id, grp_id, ...]
+        """
+        assert seq_id is not None
+        grp_id_list = []
+        if seq_id in self.seq_mapping:
+            grp_id_list = self.seq_mapping[seq_id]
+        return grp_id_list
+
+    def get_num_free_blocks(self, seq_id: Optional[int] = None) -> int:
+        free_blocks = len(self._free_block_grp_indices) * self._blk_num_per_grp
+        if seq_id is not None:
+            if seq_id in self.seq_mapping:
+                # seq_id is already allocated
+                grp_id_list = self.seq_mapping[seq_id]
+                free_blocks += len(self._free_block_indices[grp_id_list[-1]])
+            else:
+                # new seq_id
+                if len(self.seq_mapping) >= max_seq_num:
+                    return 0
+            # means real allocate, only consider free 8K block groups
+            return free_blocks
+        else:
+            # for memory usage analysis / swap
+            # need consider also the free blocks that in 8K blocks groups
+            for _, grp_id_list in self.seq_mapping.items():
+                if len(grp_id_list) > 0:
+                    free_blocks += len(self._free_block_indices[grp_id_list[-1]])
+            return free_blocks
+
+    def get_num_total_blocks(self, seq_id: Optional[int] = None) -> int:
+        return len(self._all_block_indices)
+
+    def get_physical_block_id(self, absolute_id: int) -> int:
+        """Returns the zero-offset block id on certain block allocator
+        given the absolute block id.
+
+        Args:
+            absolute_id (int): The absolute block id for the block 
+            in whole allocator.
+
+        Returns:
+            int: The zero-offset block id on certain device.
+        """
+        return sorted(self._all_block_indices).index(absolute_id)
+
+    @property
+    def refcounter(self):
+        return self._refcounter
+
+    @property
+    def all_block_ids(self) -> FrozenSet[int]:
+        return self._all_block_indices
+
+    def cow_block_if_not_appendable(self, block: Block, seq_id: Optional[int] = None) -> BlockId:
+        """Performs a copy-on-write operation on the given block if it is not
+        appendable.
+
+        Args:
+            block (Block): The block to check for copy-on-write.
+
+        Returns:
+            BlockId: The block index of the new block if a copy-on-write 
+                operation was performed, or the original block index if
+                no copy-on-write was necessary.
+        """
+        src_block_id = block.block_id
+        assert src_block_id is not None
+
+        if self._cow_tracker.is_appendable(block):
+            return src_block_id
+
+        self._free_block_id(block, seq_id)
+        trg_block_id = self._allocate_block_id()
+
+        self._cow_tracker.record_cow(src_block_id, trg_block_id)
+
+        return trg_block_id
+
+    def clear_copy_on_writes(self, seq_id: Optional[int] = None) -> List[Tuple[BlockId, BlockId]]:
+        """Returns the copy-on-write source->destination mapping and clears it.
+
+        Returns:
+            List[Tuple[BlockId, BlockId]]: A list mapping source
+                block indices to destination block indices.
+        """
+        return self._cow_tracker.clear_cows()
+
+    def mark_blocks_as_accessed(self, block_ids: List[int],
+                                now: float) -> None:
+        """Mark blocks as accessed, used in prefix caching.
+
+        Since the naive allocator does not implement prefix caching, we do
+        nothing.
+        """
+        pass
+
+    def mark_blocks_as_computed(self, block_ids: List[int]) -> None:
+        """Mark blocks as computed, used in prefix caching.
+
+        Since the naive allocator does not implement prefix caching, we do
+        nothing.
+        """
+        pass
+
+    def get_common_computed_block_ids(
+            self, computed_seq_block_ids: List[List[int]]) -> List[int]:
+        """Determine blocks that can be skipped in prefill.
+
+        Since the naive allocator does not support prefix caching, always return
+        an empty list.
+        """
+        return []
+
+    def promote_to_immutable_block(self, block: Block) -> BlockId:
+        raise NotImplementedError("There is no promotion for naive blocks")
+
+    def get_num_full_blocks_touched(self, blocks: List[Block]) -> int:
+        """Returns the number of full blocks that will be touched by
+        swapping in/out.
+
+        Args:
+            blocks: List of blocks to be swapped.
+        Returns:
+            int: the number of full blocks that will be touched by
+                swapping in/out the given blocks. Non full blocks are ignored
+                when deciding the number of blocks to touch.
+        """
+        # NOTE: for naive block, we use set to eliminate common blocks among
+        # seqs, also we compare the empty slots in the mutable blocks with
+        # lookahead slots to get the number of unique new block that are
+        # needed.
+        old_block_set = set()
+        for block in blocks:
+            if block.is_full:
+                old_block_set.add(block)
+        return len(old_block_set)
+
+    def swap_out(self, blocks: List[Block], seq_id: Optional[int] = None) -> None:
+        for block in blocks:
+            self._free_block_id(block, seq_id)
+
+    def swap_in(self, blocks: List[Block]) -> None:
+        for block in blocks:
+            # Here we allocate either immutable or mutable block and then
+            # extract its block_id. Note that the block object is released
+            # and the block_id is assigned to "block" to allow reusing the
+            # existing "block" object
+            if block.is_full:
+                tmp_block = self.allocate_immutable_block(
+                    prev_block=block.prev_block, token_ids=block.token_ids)
+            else:
+                tmp_block = self.allocate_mutable_block(
+                    prev_block=block.prev_block)
+                tmp_block.append_token_ids(block.token_ids)
+
+            block_id = tmp_block.block_id
+            tmp_block.block_id = None
+            self._block_pool.free_block(tmp_block)
+
+            block.block_id = block_id  # Assign block_id
+
+    def get_prefix_cache_hit_rate(self) -> float:
+        return -1
+
+    def reset_prefix_cache(self) -> bool:
+        """No prefix cache for naive block allocator."""
+        return True
+
+    def find_cached_blocks_prefix(self, block_hashes: List[int]) -> List[int]:
+        # Not applicable for naive block allocator.
+        return []
+
+class NaiveBlock(Block):
+    def append_token_ids(self, token_ids: List[int], seq_id: Optional[int] = None) -> None:
+        """Appends the given token IDs to the block and performs a 
+        copy-on-write if necessary.
+
+        Args:
+            token_ids (Optional[List[int]]): The token IDs to be appended 
+                to the block.
+        """
+        assert seq_id is not None
+        self._append_token_ids_no_cow(token_ids)
+
+        if self._block_id is not None:
+            self._block_id = (self._allocator.cow_block_if_not_appendable(
+                self._cow_target, seq_id))

vllm_vacc/vllm/core/block/prefix_caching_block.py

@@ -0,0 +1,942 @@
+# SPDX-License-Identifier: Apache-2.0
+"""Token blocks."""
+import sys
+from bisect import bisect_left
+from os.path import commonprefix
+from typing import (Callable, Dict, FrozenSet, Iterable, List, Optional, Set,
+                    Tuple)
+
+from vllm.core.block.common import (CacheMetricData, CopyOnWriteTracker,
+                                    get_all_blocks_recursively)
+from vllm.core.block.interfaces import (Block, BlockAllocator, BlockId, Device,
+                                        DeviceAwareBlockAllocator)
+from vllm.core.block.naive_block import (BlockPool, NaiveBlock)
+from vllm_vacc.vllm.core.block.naive_block import NaiveBlockAllocator
+from vllm.core.block.prefix_caching_block import BlockTracker, assert_prefix_caching_block_or_none
+
+from vllm.core.evictor import EvictionPolicy, Evictor, make_evictor
+from vllm.logger import init_logger
+from vllm.sequence import Sequence
+
+logger = init_logger(__name__)
+
+PrefixHash = int
+
+# By default, we init our block access time as _DEFAULT_LAST_ACCESSED_TIME
+# so that if we find one block is still hold _DEFAULT_LAST_ACCESSED_TIME,
+# then we know this block hasn't been accessed yet.
+_DEFAULT_LAST_ACCESSED_TIME = -1
+
+logger = init_logger(__name__)
+
+
+class PrefixCachingBlockAllocator(BlockAllocator):
+    """A block allocator that implements prefix caching.
+
+    The PrefixCachingBlockAllocator maintains a cache of blocks based on their
+    content hash. It reuses blocks with the same content hash to avoid redundant
+    memory allocation. The allocator also supports copy-on-write operations.
+
+    Args:
+        num_blocks (int): The total number of blocks to manage.
+        block_size (int): The size of each block in tokens.
+        block_ids(Optional[Iterable[int]], optional): An optional iterable of
+            block IDs. If not provided, block IDs will be assigned sequentially
+            from 0 to num_blocks - 1.
+    """
+
+    # Note that we use 'None' as a string here instead of None because
+    # as of Python 3.12, hash(None) returns a constant predictable value.
+    # This could possibly make it easier to find and exploit hash
+    # collisions. 'None' as a string will be hashed differently per process,
+    # but consistently within the same process. This is the same as the
+    # behavior of None prior to Python 3.12.
+    _none_hash: int = hash('None')
+
+    # Implements Block.Factory.
+    def __init__(
+        self,
+        num_blocks: int,
+        block_size: int,
+        block_ids: Optional[Iterable[int]] = None,
+        eviction_policy: EvictionPolicy = EvictionPolicy.LRU,
+    ):
+        if block_ids is None:
+            block_ids = range(num_blocks)
+
+        self._block_size = block_size
+
+        # A mapping of prefix hash to block index. All blocks which have a
+        # prefix hash will be in this dict, even if they have refcount 0.
+        self._cached_blocks: Dict[PrefixHash, BlockId] = {}
+
+        # A list of immutable block IDs that have been touched by scheduler
+        # and should be marked as computed after an entire batch of sequences
+        # are scheduled.
+        self._touched_blocks: Set[BlockId] = set()
+
+        # Used to track status of each physical block id
+        self._block_tracker: Dict[BlockId, BlockTracker] = {}
+        for block_id in block_ids:
+            self._block_tracker[block_id] = BlockTracker()
+
+        # Pre-allocate "num_blocks * extra_factor" block objects.
+        # The "* extra_factor" is a buffer to allow more block objects
+        # than physical blocks
+        extra_factor = 4
+        self._block_pool = BlockPool(self._block_size, self._create_block,
+                                     self, num_blocks * extra_factor)
+
+        # An allocator for blocks that do not have prefix hashes.
+        self._hashless_allocator = NaiveBlockAllocator(
+            create_block=self._create_block,  # type: ignore
+            num_blocks=num_blocks,
+            block_size=block_size,
+            block_ids=block_ids,
+            block_pool=self._block_pool,  # Share block pool here
+        )
+
+        # Evitor used to maintain how we want to handle those computed blocks
+        # if we find memory pressure is high.
+        self.eviction_policy = eviction_policy
+        self.evictor: Evictor = make_evictor(self.eviction_policy)
+
+        # We share the refcounter between allocators. This allows us to promote
+        # blocks originally allocated in the hashless allocator to immutable
+        # blocks.
+        self._refcounter = self._hashless_allocator.refcounter
+
+        self._cow_tracker = CopyOnWriteTracker(
+            refcounter=self._refcounter.as_readonly())
+
+        self.metric_data = CacheMetricData()
+
+    def _create_block(
+        self,
+        prev_block: Optional[Block],
+        token_ids: List[int],
+        block_size: int,
+        allocator: BlockAllocator,
+        block_id: Optional[int] = None,
+        computed: bool = False,
+        extra_hash: Optional[int] = None,
+    ) -> Block:
+        # Bind block to self.
+        allocator = self
+
+        return PrefixCachingBlock(
+            prev_block=prev_block,
+            token_ids=token_ids,
+            block_size=block_size,
+            block_id=block_id,
+            allocator=allocator,
+            computed=computed,
+            extra_hash=extra_hash,
+        )
+
+    def allocate_immutable_block(self,
+                                 prev_block: Optional[Block],
+                                 token_ids: List[int],
+                                 extra_hash: Optional[int] = None,
+                                 device: Optional[Device] = None,
+                                 seq_id: Optional[int] = None) -> Block:
+        """Allocates an immutable block with the given token IDs, reusing cached
+        blocks if possible.
+
+        Args:
+            prev_block (Optional[Block]): The previous block in the sequence.
+            token_ids (List[int]): The token IDs to be stored in the block.
+
+        Returns:
+            Block: The allocated immutable block.
+        """
+        assert device is None
+        assert_prefix_caching_block_or_none(prev_block)
+
+        # First, try to create a block that points to cached data
+        block = self._block_pool.init_block(prev_block=prev_block,
+                                            token_ids=token_ids,
+                                            block_size=self._block_size,
+                                            physical_block_id=None,
+                                            extra_hash=extra_hash)
+        assert block.content_hash is not None
+
+        cached_block_id = self._cached_blocks.get(block.content_hash, None)
+        if cached_block_id is not None:
+            self.metric_data.query(hit=True)
+            block.block_id = cached_block_id
+            self._incr_refcount_cached_block(block)
+            return block
+        self.metric_data.query(hit=False)
+        self._block_pool.free_block(block)
+
+        # No cached block => Allocate a new block
+        block = self.allocate_mutable_block(prev_block, extra_hash=extra_hash, seq_id=seq_id)
+        logger.warning(f"Teng seq_id: {seq_id} block: {block.block_id} hash: {block.content_hash}")
+        
+        block.append_token_ids(token_ids, seq_id=seq_id)
+        return block
+
+    def allocate_immutable_blocks(
+            self,
+            prev_block: Optional[Block],
+            block_token_ids: List[List[int]],
+            extra_hash: Optional[int] = None,
+            device: Optional[Device] = None,
+            seq_id: Optional[int] = None) -> List[Block]:
+        blocks = []
+        for token_ids in block_token_ids:
+            prev_block = self.allocate_immutable_block(prev_block=prev_block,
+                                                       token_ids=token_ids,
+                                                       device=device,
+                                                       extra_hash=extra_hash,
+                                                       seq_id=seq_id)
+            blocks.append(prev_block)
+        return blocks
+
+    def allocate_mutable_block(self,
+                               prev_block: Optional[Block],
+                               extra_hash: Optional[int] = None,
+                               device: Optional[Device] = None,
+                               seq_id: Optional[int] = None) -> Block:
+        """Allocates a mutable block. If there are no free blocks, this will
+        evict unused cached blocks.
+
+        Args:
+            prev_block (Block): The previous block in the sequence.
+                None is not allowed unlike it is super class.
+
+        Returns:
+            Block: The allocated mutable block.
+        """
+        assert device is None
+        assert seq_id is not None
+        assert_prefix_caching_block_or_none(prev_block)
+
+        block_id = self._allocate_block_id(seq_id)
+        block = self._block_pool.init_block(prev_block=prev_block,
+                                            token_ids=[],
+                                            block_size=self._block_size,
+                                            physical_block_id=block_id,
+                                            extra_hash=extra_hash)
+        assert not block.computed
+        assert block.content_hash is None
+        return block
+
+    def _incr_refcount_cached_block(self, block: Block) -> None:
+        # Set this block to be "computed" since it is pointing to a
+        # cached block id (which was already computed)
+        block.computed = True
+
+        block_id = block.block_id
+        assert block_id is not None
+
+        refcount = self._refcounter.incr(block_id)
+        if refcount == 1:
+            # In case a cached block was evicted, restore its tracking
+            if block_id in self.evictor:
+                self.evictor.remove(block_id)
+
+            self._track_block_id(block_id, computed=True)
+
+    def _decr_refcount_cached_block(self, block: Block) -> None:
+        # Ensure this is immutable/cached block
+        assert block.content_hash is not None
+
+        block_id = block.block_id
+        assert block_id is not None
+
+        refcount = self._refcounter.decr(block_id)
+        if refcount > 0:
+            block.block_id = None
+            return
+        else:
+            assert refcount == 0
+
+        # No longer used
+        assert block.content_hash in self._cached_blocks
+
+        # Add the cached block to the evictor
+        # (This keeps the cached block around so it can be reused)
+        self.evictor.add(block_id, block.content_hash, block.num_tokens_total,
+                         self._block_tracker[block_id].last_accessed)
+
+        # Stop tracking the block
+        self._untrack_block_id(block_id)
+
+        block.block_id = None
+
+    def _decr_refcount_hashless_block(self, block: Block, seq_id: Optional[int] = None) -> None:
+        block_id = block.block_id
+        assert block_id is not None
+
+        # We may have a fork case where block is shared,
+        # in which case, we cannot remove it from tracking
+        refcount = self._refcounter.get(block_id)
+        if refcount == 1:
+            self._untrack_block_id(block_id)
+
+        # Decrement refcount of the block_id, but do not free the block object
+        # itself (will be handled by the caller)
+        self._hashless_allocator.free(block, keep_block_object=True, seq_id=seq_id)
+
+    def _allocate_block_id(self, seq_id: Optional[int] = None) -> BlockId:
+        """First tries to allocate a block id from the hashless allocator,
+        and if there are no blocks, then tries to evict an unused cached block.
+        """
+        assert seq_id is not None
+        hashless_block_id = self._maybe_allocate_hashless_block_id(seq_id=seq_id)
+        if hashless_block_id is not None:
+            return hashless_block_id
+
+        evicted_block_id = self._maybe_allocate_evicted_block_id()
+        if evicted_block_id is not None:
+            return evicted_block_id
+
+        # No block available in hashless allocator, nor in unused cache blocks.
+        raise BlockAllocator.NoFreeBlocksError()
+
+    def _maybe_allocate_hashless_block_id(self, seq_id: Optional[int] = None) -> Optional[BlockId]:
+        try:
+            # Allocate mutable block and extract its block_id
+            block = self._hashless_allocator.allocate_mutable_block(
+                prev_block=None, seq_id=seq_id)
+            block_id = block.block_id
+            self._block_pool.free_block(block)
+
+            self._track_block_id(block_id, computed=False)
+            return block_id
+        except BlockAllocator.NoFreeBlocksError:
+            return None
+
+    def _maybe_allocate_evicted_block_id(self) -> Optional[BlockId]:
+        if self.evictor.num_blocks == 0:
+            return None
+
+        # Here we get an evicted block, which is only added
+        # into evictor if its ref counter is 0
+        # and since its content would be changed, we need
+        # to remove it from _cached_blocks's tracking list
+        block_id, content_hash_to_evict = self.evictor.evict()
+
+        # Sanity checks
+        assert content_hash_to_evict in self._cached_blocks
+        _block_id = self._cached_blocks[content_hash_to_evict]
+        assert self._refcounter.get(_block_id) == 0
+        assert _block_id == block_id
+
+        self._cached_blocks.pop(content_hash_to_evict)
+
+        self._refcounter.incr(block_id)
+        self._track_block_id(block_id, computed=False)
+
+        return block_id
+
+    def _free_block_id(self, block: Block, seq_id: Optional[int] = None) -> None:
+        """Decrements the refcount of the block. The block may be in two 
+        possible states: (1) immutable/cached or (2) mutable/hashless. 
+        In the first case, the refcount is decremented directly and the block
+        may be possibly added to the evictor. In other case, hashless 
+        allocator free(..) with keep_block_object=True is called to only free
+        the block id (since the block object may be reused by the caller)
+        """
+        block_id = block.block_id
+        assert block_id is not None, "Freeing unallocated block is undefined"
+
+        if block.content_hash is not None:
+            # Immutable: This type of block is always cached, and we want to
+            # keep it in the evictor for future reuse
+            self._decr_refcount_cached_block(block)
+        else:
+            # Mutable: This type of block is not cached, so we release it
+            # directly to the hashless allocator
+            self._decr_refcount_hashless_block(block, seq_id=seq_id)
+
+        assert block.block_id is None
+
+    def free(self, block: Block, keep_block_object: bool = False, seq_id: Optional[int] = None) -> None:
+        """Release the block (look at free_block_id(..) docs)
+        """
+        # Release the physical block index
+        self._free_block_id(block, seq_id=seq_id)
+
+        # Release the block object to the pool
+        if not keep_block_object:
+            self._block_pool.free_block(block)
+
+    def fork(self, last_block: Block) -> List[Block]:
+        """Creates a new sequence of blocks that shares the same underlying
+        memory as the original sequence.
+
+        Args:
+            last_block (Block): The last block in the original sequence.
+
+        Returns:
+            List[Block]: The new sequence of blocks that shares the same memory
+                as the original sequence.
+        """
+        source_blocks = get_all_blocks_recursively(last_block)
+
+        forked_blocks: List[Block] = []
+        prev_block = None
+        for block in source_blocks:
+            block_id = block.block_id
+            assert block_id is not None
+
+            refcount = self._refcounter.incr(block_id)
+            assert refcount != 1, "can't fork free'd block_id = {}".format(
+                block_id)
+
+            forked_block = self._block_pool.init_block(
+                prev_block=prev_block,
+                token_ids=block.token_ids,
+                block_size=self._block_size,
+                physical_block_id=block_id,
+                extra_hash=block.extra_hash)
+
+            forked_blocks.append(forked_block)
+            prev_block = forked_blocks[-1]
+
+        return forked_blocks
+
+    def get_num_free_blocks(self, seq_id: Optional[int] = None, device: Optional[Device] = None) -> int:
+        assert device is None
+        # The number of free blocks is the number of hashless free blocks
+        # plus the number of blocks evictor could free from its list.
+        return self._hashless_allocator.get_num_free_blocks(seq_id=seq_id
+        ) + self.evictor.num_blocks
+
+    def get_num_total_blocks(self, seq_id: Optional[int] = None) -> int:
+        return self._hashless_allocator.get_num_total_blocks(seq_id=seq_id)
+
+    def get_physical_block_id(self, absolute_id: int) -> int:
+        """Returns the zero-offset block id on certain block allocator
+        given the absolute block id.
+
+        Args:
+            absolute_id (int): The absolute block id for the block 
+                in whole allocator.
+
+        Returns:
+            int: The rzero-offset block id on certain device.
+        """
+        return sorted(self.all_block_ids).index(absolute_id)
+
+    @property
+    def all_block_ids(self) -> FrozenSet[int]:
+        return self._hashless_allocator.all_block_ids
+
+    def get_prefix_cache_hit_rate(self) -> float:
+        return self.metric_data.get_hit_rate()
+
+    def reset_prefix_cache(self) -> bool:
+        """Reset prefix cache. This function may be used in RLHF
+        flows to invalid prefix caching after the weights are updated,
+        or used for resetting prefix caching status for benchmarking.
+
+        Returns:
+            bool: True if the prefix cache is successfully reset,
+            False otherwise.
+        """
+        num_used_blocks = (self.get_num_total_blocks() -
+                           self.get_num_free_blocks())
+        if num_used_blocks > 0:
+            logger.warning(
+                "Failed to reset prefix cache because some "
+                "blocks (%d) are not freed yet", num_used_blocks)
+            return False
+
+        # Free all blocks in the evictor.
+        while (block_id :=
+               self._maybe_allocate_evicted_block_id()) is not None:
+            # TODO: Teng
+            self._hashless_allocator.free_block_id(block_id)
+
+        # Should not have any cached blocks because all blocks are evicted.
+        assert not self._cached_blocks
+
+        # Reset the evictor.
+        self.evictor = make_evictor(self.eviction_policy)
+
+        # Reset the block tracker.
+        for block_id in self._block_tracker:
+            self._block_tracker[block_id] = BlockTracker()
+
+        # Reset the metrics.
+        self.metric_data = CacheMetricData()
+
+        logger.info("Successfully reset prefix cache")
+        return True
+
+    def is_block_cached(self, block: Block) -> bool:
+        assert block.content_hash is not None
+        return block.content_hash in self._cached_blocks
+
+    def promote_to_immutable_block(self, block: Block, seq_id: Optional[int] = None) -> BlockId:
+        """Once a mutable block is full, it can be promoted to an immutable
+        block. This means that its content can be referenced by future blocks
+        having the same prefix.
+
+        Note that if we already have a cached block with the same content, we
+        will replace the newly-promoted block's mapping with the existing cached
+        block id.
+
+        Args:
+            block: The mutable block to be promoted.
+
+        Returns:
+            BlockId: Either the original block index, or the block index of
+                the previously cached block matching the same content.
+        """
+        # Ensure block can be promoted
+        assert block.content_hash is not None
+        assert block.block_id is not None
+        assert self._refcounter.get(block.block_id) > 0
+
+        if block.content_hash not in self._cached_blocks:
+            # No cached content hash => Set this block as cached.
+            # Note that this block cannot be marked as computed yet
+            # because other sequences in the same batch cannot reuse
+            # this block.
+            self._cached_blocks[block.content_hash] = block.block_id
+            # Mark this block as touched so that it can be marked as
+            # computed after the entire batch of sequences are scheduled.
+            self._touched_blocks.add(block.block_id)
+            return block.block_id
+
+        # Reuse the cached content hash
+        self._decr_refcount_hashless_block(block, seq_id=seq_id)
+        block.block_id = self._cached_blocks[block.content_hash]
+
+        # Increment refcount of the cached block and (possibly) restore
+        # it from the evictor.
+        # Note that in this case, the block is marked as computed
+        self._incr_refcount_cached_block(block)
+
+        return block.block_id
+
+    def cow_block_if_not_appendable(self, block: Block, seq_id: Optional[int] = None) -> BlockId:
+        """Performs a copy-on-write operation on the given block if it is not
+        appendable.
+
+        Args:
+            block (Block): The block to check for copy-on-write.
+
+        Returns:
+            BlockId: The block index of the new block if a copy-on-write 
+                operation was performed, or the original block index if
+                no copy-on-write was necessary.
+        """
+        src_block_id = block.block_id
+        assert src_block_id is not None
+
+        if self._cow_tracker.is_appendable(block):
+            return src_block_id
+
+        self._free_block_id(block)
+        trg_block_id = self._allocate_block_id()
+
+        self._cow_tracker.record_cow(src_block_id, trg_block_id)
+
+        return trg_block_id
+
+    def clear_copy_on_writes(self) -> List[Tuple[BlockId, BlockId]]:
+        """Returns the copy-on-write source->destination mapping and clears it.
+
+        Returns:
+            List[Tuple[BlockId, BlockId]]: A list mapping source
+                block indices to destination block indices.
+        """
+        return self._cow_tracker.clear_cows()
+
+    def mark_blocks_as_accessed(self, block_ids: List[int],
+                                now: float) -> None:
+        """Mark blocks as accessed, used in prefix caching.
+
+        If the block is added into evictor, we need to update corresponding
+        info in evictor's metadata.
+        """
+
+        for block_id in block_ids:
+            if self._block_tracker[block_id].active:
+                self._block_tracker[block_id].last_accessed = now
+            elif block_id in self.evictor:
+                self.evictor.update(block_id, now)
+            else:
+                raise ValueError(
+                    "Mark block as accessed which is not belonged to GPU")
+
+    def mark_blocks_as_computed(self, block_ids: List[int]) -> None:
+        # Mark all touched blocks as computed.
+        for block_id in self._touched_blocks:
+            self._block_tracker[block_id].computed = True
+        self._touched_blocks.clear()
+
+    def _track_block_id(self, block_id: Optional[BlockId],
+                        computed: bool) -> None:
+        assert block_id is not None
+        self._block_tracker[block_id].enable()
+        self._block_tracker[block_id].computed = computed
+
+    def _untrack_block_id(self, block_id: Optional[BlockId]) -> None:
+        assert block_id is not None
+        self._block_tracker[block_id].disable()
+
+    def block_is_computed(self, block_id: int) -> bool:
+        if self._block_tracker[block_id].active:
+            return self._block_tracker[block_id].computed
+        else:
+            return block_id in self.evictor
+
+    def get_common_computed_block_ids(
+            self, computed_seq_block_ids: List[List[int]]) -> List[int]:
+        """Return the block ids that are common for a given sequence group.
+
+        Only those blocks that are immutable and already be marked
+        compyted would be taken consideration.
+        """
+
+        # NOTE We exclude the last block to avoid the case where the entire
+        # prompt is cached. This would cause erroneous behavior in model
+        # runner.
+
+        # It returns a list of int although type annotation says list of string.
+        if len(computed_seq_block_ids) == 1:
+            return computed_seq_block_ids[0]
+
+        return commonprefix([
+            ids for ids in computed_seq_block_ids  # type: ignore
+            if ids
+        ])
+
+    def get_num_full_blocks_touched(self, blocks: List[Block]) -> int:
+        """Returns the number of full blocks that will be touched by
+        swapping in/out.
+
+        Args:
+            blocks: List of blocks to be swapped.
+        Returns:
+            int: the number of full blocks that will be touched by
+                swapping in/out the given blocks. Non full blocks are ignored
+                when deciding the number of blocks to touch.
+        """
+        num_touched_blocks: int = 0
+        for block in blocks:
+            # If the block has a match in the cache and the cached
+            # block is not referenced, then we still count it as a
+            # touched block
+            if block.is_full and (not self.is_block_cached(block) or \
+                (block.content_hash is not None and \
+                self._cached_blocks[block.content_hash] in \
+                        self.evictor)):
+                num_touched_blocks += 1
+        return num_touched_blocks
+
+    def swap_out(self, blocks: List[Block]) -> None:
+        """Execute the swap out actions. Basically just free the 
+        given blocks.
+
+        Args:
+            blocks: List of blocks to be swapped out.
+        """
+        for block in blocks:
+            self._free_block_id(block)
+
+    def swap_in(self, blocks: List[Block]) -> None:
+        """Execute the swap in actions. Change the block id from 
+        old allocator to current allocator for each block to finish 
+        the block table update. 
+
+        Args:
+            blocks: List of blocks to be swapped in.
+        """
+        for block in blocks:
+            # Here we allocate either immutable or mutable block and then
+            # extract its block_id. Note that the block object is released
+            # and the block_id is assigned to "block" to allow reusing the
+            # existing "block" object
+            if block.is_full:
+                tmp_block = self.allocate_immutable_block(
+                    prev_block=block.prev_block,
+                    token_ids=block.token_ids,
+                    extra_hash=block.extra_hash)
+            else:
+                tmp_block = self.allocate_mutable_block(
+                    prev_block=block.prev_block, extra_hash=block.extra_hash)
+                tmp_block.append_token_ids(block.token_ids)
+
+            block_id = tmp_block.block_id
+            self._block_pool.free_block(tmp_block)
+
+            block.block_id = block_id  # Assign block_id
+
+    def find_cached_blocks_prefix(self, block_hashes: List[int]) -> List[int]:
+        """
+        Given a list of block hashes, return the prefix of the block hashes that
+        are all cached.
+
+        Since a block's block hash includes the hashes of all previous blocks,
+        and we only allocate/deallocate blocks in the entire sequence, so if a
+        block is cached, then all previous blocks are also cached. With this
+        property, we can use binary search to find the prefix of cached blocks.
+
+        Args:
+            block_hashes (List[int]): The list of block hashes.
+
+        Returns:
+            List[int]: The prefix of the `block_hashes` that are cached.
+        """
+
+        def _block_is_cached(block_hash: PrefixHash) -> bool:
+            if block_hash not in self._cached_blocks:
+                return False
+
+            cached_block_id = self._cached_blocks[block_hash]
+            # We only consider the blocks that are marked as computed.
+            return self.block_is_computed(cached_block_id)
+
+        def _bisect_left(a, x, key: Callable[[PrefixHash], bool]) -> int:
+
+            # python <= 3.10 don't have the key argument
+            if sys.version_info < (3, 10):
+                a = [key(e) for e in a]
+                return bisect_left(a, x)
+            else:
+                return bisect_left(a, x, key=key)
+
+        # Look for the first block that's not cached, and returns the prefix
+        # i.e. blocks that are cached.
+        idx = _bisect_left(block_hashes,
+                           True,
+                           key=lambda x: not _block_is_cached(x))
+        return block_hashes[:idx]
+
+
+class PrefixCachingBlock(Block):
+    """A block implementation that supports prefix caching.
+
+    The PrefixCachingBlock class represents a block of token IDs with prefix
+    caching capabilities. It wraps a NaiveBlock internally and provides
+    additional functionality for content hashing and promoting immutable blocks
+    with the prefix caching allocator.
+
+    Args:
+        prev_block (Optional[PrefixCachingBlock]): The previous block in the
+            sequence.
+        token_ids (List[int]): The initial token IDs to be stored in the block.
+        block_size (int): The maximum number of token IDs that can be stored in
+            the block.
+        allocator (BlockAllocator): The prefix
+            caching block allocator associated with this block.
+        block_id (Optional[int], optional): The physical block index
+            of this block. Defaults to None.
+        extra_hash (Optional[int]): The hash value of additional factors
+            such as adapters that influence the block, apart from the token_ids.
+    """
+
+    # Note that we use 'None' as a string here instead of None because
+    # as of Python 3.12, hash(None) returns a constant predictable value.
+    # This could possibly make it easier to find and exploit hash
+    # collisions. 'None' as a string will be hashed differently per process,
+    # but consistently within the same process. This is the same as the
+    # behavior of None prior to Python 3.12.
+    _none_hash: int = hash('None')
+
+    def __init__(
+        self,
+        prev_block: Optional[Block],
+        token_ids: List[int],
+        block_size: int,
+        allocator: BlockAllocator,
+        block_id: Optional[int] = None,
+        computed: bool = False,
+        extra_hash: Optional[int] = None,
+    ):
+        assert isinstance(allocator, PrefixCachingBlockAllocator), (
+            "Currently this class is only tested with "
+            "PrefixCachingBlockAllocator. Got instead allocator = {}".format(
+                allocator))
+        assert_prefix_caching_block_or_none(prev_block)
+
+        self._prev_block = prev_block
+        self._cached_content_hash: Optional[int] = None
+        self._cached_num_tokens_total: int = 0
+        self._allocator = allocator
+        self._last_accessed: float = _DEFAULT_LAST_ACCESSED_TIME
+        self._computed = computed
+        self._extra_hash = extra_hash
+
+        # On the first time, we create the block object, and next we only
+        # reinitialize it
+        if hasattr(self, "_block"):
+            self._block.__init__(  # type: ignore[has-type]
+                prev_block=prev_block,
+                token_ids=token_ids,
+                block_size=block_size,
+                block_id=block_id,
+                allocator=self._allocator)
+        else:
+            self._block = NaiveBlock(prev_block=prev_block,
+                                     token_ids=token_ids,
+                                     block_size=block_size,
+                                     block_id=block_id,
+                                     allocator=self._allocator)
+
+        self._update_num_tokens_total()
+
+    def _update_num_tokens_total(self):
+        """Incrementally computes the number of tokens that there is
+        till the current block (included)
+        """
+        res = 0
+
+        # Add all previous blocks
+        if self._prev_block is not None:
+            res += self._prev_block.num_tokens_total
+
+        # Add current block
+        res += len(self.token_ids)
+
+        self._cached_num_tokens_total = res
+
+    @property
+    def computed(self) -> bool:
+        return self._computed
+
+    @computed.setter
+    def computed(self, value) -> None:
+        self._computed = value
+
+    @property
+    def last_accessed(self) -> float:
+        return self._last_accessed
+
+    @last_accessed.setter
+    def last_accessed(self, last_accessed_ts: float):
+        self._last_accessed = last_accessed_ts
+
+    def append_token_ids(self, token_ids: List[int], seq_id: Optional[int] = None) -> None:
+        """Appends the given token IDs to the block and registers the block as
+        immutable if the block becomes full.
+
+        Args:
+            token_ids (List[int]): The token IDs to be appended to the block.
+        """
+        # Ensure this is mutable block (not promoted)
+        assert self.content_hash is None
+        assert not self.computed
+        assert seq_id is not None
+
+        if len(token_ids) == 0:
+            return
+
+        # Ensure there are input tokens
+        assert token_ids, "Got token_ids = {}".format(token_ids)
+
+        # Naive block handles CoW.
+        self._block.append_token_ids(token_ids, seq_id=seq_id)
+        self._update_num_tokens_total()
+
+        # If the content hash is present, then the block can be made immutable.
+        # Register ourselves with the allocator, potentially replacing the
+        # physical block index.
+        if self.content_hash is not None:
+            self.block_id = self._allocator.promote_to_immutable_block(self, seq_id=seq_id)
+
+    @property
+    def block_id(self) -> Optional[int]:
+        return self._block.block_id
+
+    @block_id.setter
+    def block_id(self, value) -> None:
+        self._block.block_id = value
+
+    @property
+    def is_full(self) -> bool:
+        return self._block.is_full
+
+    @property
+    def num_empty_slots(self) -> int:
+        return self._block.num_empty_slots
+
+    @property
+    def num_tokens_total(self) -> int:
+        return self._cached_num_tokens_total
+
+    @property
+    def block_size(self) -> int:
+        return self._block.block_size
+
+    @property
+    def token_ids(self) -> List[int]:
+        return self._block.token_ids
+
+    @property
+    def prev_block(self) -> Optional[Block]:
+        return self._prev_block
+
+    @property
+    def extra_hash(self) -> Optional[int]:
+        return self._extra_hash
+
+    @property
+    def content_hash(self) -> Optional[int]:
+        """Return the content-based hash of the current block, or None if it is
+        not yet defined.
+
+        For the content-based hash to be defined, the current block must be
+        full.
+        """
+        # If the hash is already computed, return it.
+        if self._cached_content_hash is not None:
+            return self._cached_content_hash
+
+        # We cannot compute a hash for the current block because it is not full.
+        if not self.is_full:
+            return None
+
+        is_first_block = self._prev_block is None
+        prev_block_hash = (
+            self._none_hash if is_first_block else
+            self._prev_block.content_hash  # type: ignore
+        )
+
+        # Previous block exists but does not yet have a hash.
+        # Return no hash in this case.
+        if prev_block_hash == self._none_hash and not is_first_block:
+            return None
+
+        self._cached_content_hash = PrefixCachingBlock.hash_block_tokens(
+            is_first_block,
+            prev_block_hash,
+            cur_block_token_ids=self.token_ids,
+            extra_hash=self._extra_hash)
+        return self._cached_content_hash
+
+    @classmethod
+    def hash_block_tokens(cls,
+                          is_first_block: bool,
+                          prev_block_hash: Optional[int],
+                          cur_block_token_ids: List[int],
+                          extra_hash: Optional[int] = None) -> int:
+        """Computes a hash value corresponding to the contents of a block and
+        the contents of the preceding block(s). The hash value is used for
+        prefix caching.
+
+        Parameters:
+        - is_first_block (bool): A flag indicating if the block is the first in
+            the sequence.
+        - prev_block_hash (Optional[int]): The hash of the previous block. None
+            if this is the first block.
+        - cur_block_token_ids (List[int]): A list of token ids in the current
+            block. The current block is assumed to be full.
+        - extra_hash (Optional[int]): The hash value of additional factors
+            such as adapters that influence the block, apart from the token_ids.
+
+        Returns:
+        - int: The computed hash value for the block.
+        """
+        if is_first_block and prev_block_hash is None:
+            prev_block_hash = cls._none_hash
+        return hash((is_first_block, prev_block_hash, *cur_block_token_ids,
+                     extra_hash))

vllm_vacc/vllm/core/block_manager.py

@@ -0,0 +1,575 @@
+# SPDX-License-Identifier: Apache-2.0
+"""A block manager that manages token blocks."""
+from typing import Dict, List, Optional
+from typing import Sequence as GenericSequence
+from typing import Tuple
+
+from vllm.core.block.block_table import BlockTable
+from vllm.core.block.cpu_gpu_block_allocator import CpuGpuBlockAllocator
+from vllm.core.block.interfaces import Block
+from vllm.core.block.prefix_caching_block import (ComputedBlocksTracker,
+                                                  LastAccessBlocksTracker)
+from vllm.core.block.utils import check_no_caching_or_swa_for_blockmgr_encdec
+from vllm.core.interfaces import AllocStatus, BlockSpaceManager
+from vllm.sequence import Sequence, SequenceGroup, SequenceStatus
+from vllm.utils import Device
+import os
+SeqId = int
+EncoderSeqId = str
+
+import logging
+logger = logging.getLogger(__name__)
+
+from vllm_vacc.vllm.model_executor.models.vars import LLM_MAX_PREFILL_SEQ_LEN
+
+max_seq_num = int(os.getenv("MAX_SEQ_NUM", 4))
+if max_seq_num not in [1, 2, 4]:
+    max_seq_num = 4
+
+from vllm_vacc.vllm.model_executor.models.vars import BLOCK_GROUP_SIZE as env_blk_grp_size
+
+class SelfAttnBlockSpaceManager(BlockSpaceManager):
+    """BlockSpaceManager which manages the allocation of KV cache.
+
+    It owns responsibility for allocation, swapping, allocating memory for
+    autoregressively-generated tokens, and other advanced features such as
+    prefix caching, forking/copy-on-write, and sliding-window memory allocation.
+
+    This class implements the design described in
+    https://github.com/vllm-project/vllm/pull/3492.
+
+    Lookahead slots
+        The block manager has the notion of a "lookahead slot". These are slots
+        in the KV cache that are allocated for a sequence. Unlike the other
+        allocated slots, the content of these slots is undefined -- the worker
+        may use the memory allocations in any way.
+
+        In practice, a worker could use these lookahead slots to run multiple
+        forward passes for a single scheduler invocation. Each successive
+        forward pass would write KV activations to the corresponding lookahead
+        slot. This allows low inter-token latency use-cases, where the overhead
+        of continuous batching scheduling is amortized over >1 generated tokens.
+
+        Speculative decoding uses lookahead slots to store KV activations of
+        proposal tokens.
+
+        See https://github.com/vllm-project/vllm/pull/3250 for more information
+        on lookahead scheduling.
+
+    Args:
+        block_size (int): The size of each memory block.
+        num_gpu_blocks (int): The number of memory blocks allocated on GPU.
+        num_cpu_blocks (int): The number of memory blocks allocated on CPU.
+        watermark (float, optional): The threshold used for memory swapping.
+            Defaults to 0.01.
+        sliding_window (Optional[int], optional): The size of the sliding
+            window. Defaults to None.
+        enable_caching (bool, optional): Flag indicating whether caching is
+            enabled. Defaults to False.
+    """
+
+    def __init__(
+        self,
+        block_size: int,
+        num_gpu_blocks: int,
+        num_cpu_blocks: int,
+        watermark: float = 0.01,
+        sliding_window: Optional[int] = None,
+        enable_caching: bool = False,
+    ) -> None:
+        self.block_size = block_size
+        self.num_total_gpu_blocks = num_gpu_blocks
+        self.num_total_cpu_blocks = num_cpu_blocks
+        self.per_gpu_blocks = num_gpu_blocks // max_seq_num
+
+        self.sliding_window = sliding_window
+        # max_block_sliding_window is the max number of blocks that need to be
+        # allocated
+        self.max_block_sliding_window = None
+        if sliding_window is not None:
+            # +1 here because // rounds down
+            num_blocks = sliding_window // block_size + 1
+            # +1 here because the last block may not be full,
+            # and so the sequence stretches one more block at the beginning
+            # For example, if sliding_window is 3 and block_size is 4,
+            # we may need 2 blocks when the second block only holds 1 token.
+            self.max_block_sliding_window = num_blocks + 1
+
+        self.watermark = watermark
+        assert watermark >= 0.0
+
+        self.enable_caching = enable_caching
+        
+        # self.watermark_blocks = 1 # for test
+        self.watermark_blocks = int(watermark * self.per_gpu_blocks)
+
+        self.block_allocator = CpuGpuBlockAllocator.create(
+            allocator_type="prefix_caching" if enable_caching else "naive",
+            num_gpu_blocks=num_gpu_blocks,
+            num_cpu_blocks=num_cpu_blocks,
+            block_size=block_size,
+        )
+
+        self.block_tables: Dict[SeqId, BlockTable] = {}
+        self.cross_block_tables: Dict[EncoderSeqId, BlockTable] = {}
+
+        self._computed_blocks_tracker = ComputedBlocksTracker(
+            self.block_allocator, self.block_size, self.enable_caching)
+        self._last_access_blocks_tracker = LastAccessBlocksTracker(
+            self.block_allocator)
+
+    def can_allocate(self,
+                     seq_group: SequenceGroup,
+                     num_lookahead_slots: int = 0) -> AllocStatus:
+        # FIXME(woosuk): Here we assume that all sequences in the group share
+        # the same prompt. This may not be true for preempted sequences.
+
+        check_no_caching_or_swa_for_blockmgr_encdec(self, seq_group)
+
+        seq = seq_group.get_seqs(status=SequenceStatus.WAITING)[0]
+        num_required_blocks = BlockTable.get_num_required_blocks(
+            seq.get_token_ids(),
+            block_size=self.block_size,
+            num_lookahead_slots=num_lookahead_slots,
+        )
+
+        if seq_group.is_encoder_decoder():
+            encoder_seq = seq_group.get_encoder_seq()
+            assert encoder_seq is not None
+            num_required_blocks += BlockTable.get_num_required_blocks(
+                encoder_seq.get_token_ids(),
+                block_size=self.block_size,
+            )
+
+        if self.max_block_sliding_window is not None:
+            num_required_blocks = min(num_required_blocks,
+                                      self.max_block_sliding_window)
+
+        # TODO
+        # limitations to be removed later
+        required_size = num_required_blocks * self.block_size
+        if required_size > LLM_MAX_PREFILL_SEQ_LEN:
+            logging.warning(
+                f"This model's maximum input seq length limit is "
+                f"{LLM_MAX_PREFILL_SEQ_LEN} tokens. However, you requested "
+                f"({required_size} in the input messages, "
+                f"Please reduce the length of the input messages.")
+            return AllocStatus.NEVER
+
+        # Use watermark to avoid frequent cache eviction.
+        # NOTE:
+        #   num of the gpu blocks for each seq_id might not be the same
+        #   since each seq can use different blk group number
+
+        total_gpu_blocks = self.block_allocator.get_num_total_blocks(device=Device.GPU, seq_id=seq.seq_id)
+        if (total_gpu_blocks
+                - num_required_blocks < self.watermark_blocks):
+            self.block_allocator.get_num_total_blocks(device=Device.GPU, seq_id=seq.seq_id)
+            return AllocStatus.NEVER
+
+        # NOTE: num_required_blocks should be up aligned to 8K beforce compare
+        block_num = env_blk_grp_size // self.block_size
+        if num_required_blocks % block_num: # align
+            num_required_blocks = (num_required_blocks // block_num + 1) * block_num
+        
+        if total_gpu_blocks % block_num:
+            total_gpu_blocks = (total_gpu_blocks // block_num) * block_num
+        # Use the aligned memory size to decide whether to reject the request.
+        if total_gpu_blocks - num_required_blocks < self.watermark_blocks:
+            logging.warning("gpu memory may not enough, please try shorter sequence")
+            return AllocStatus.NEVER
+
+        num_free_gpu_blocks = self.block_allocator.get_num_free_blocks(
+            device=Device.GPU, seq_id=seq.seq_id)
+        # logging.warning(f"free blocks: {num_free_gpu_blocks} required: {num_required_blocks} watermark: {self.watermark_blocks}")
+
+        if num_free_gpu_blocks - num_required_blocks >= self.watermark_blocks:
+            return AllocStatus.OK
+        else:
+            # logging.warning(f"free_blocks:{num_free_gpu_blocks} "
+            #                 f"required_blocks:{num_required_blocks} "
+            #                 f"watermark:{self.watermark_blocks} "
+            #                 f"allocate seq:{seq.seq_id} later")
+            return AllocStatus.LATER
+        
+
+    def _allocate_sequence(self, seq: Sequence) -> BlockTable:
+        block_table = BlockTable(
+            block_size=self.block_size,
+            block_allocator=self.block_allocator,
+            max_block_sliding_window=self.max_block_sliding_window,
+        )
+        if seq.get_token_ids():
+            # NOTE: If there are any factors affecting the block besides
+            # token_ids, they should be added as input to extra_hash.
+            extra_hash = seq.extra_hash()
+
+            # Add blocks to the block table only if the sequence is non empty.
+            block_table.allocate(token_ids=seq.get_token_ids(),
+                                 extra_hash=extra_hash,
+                                 seq_id=seq.seq_id)
+
+        return block_table
+
+    def allocate(self, seq_group: SequenceGroup) -> None:
+
+        # Allocate self-attention block tables for decoder sequences
+        waiting_seqs = seq_group.get_seqs(status=SequenceStatus.WAITING)
+        assert not (set(seq.seq_id for seq in waiting_seqs)
+                    & self.block_tables.keys()), "block table already exists"
+
+        # NOTE: Here we assume that all sequences in the group have the same
+        # prompt.
+        seq = waiting_seqs[0]
+        block_table: BlockTable = self._allocate_sequence(seq)
+        self.block_tables[seq.seq_id] = block_table
+
+        # Track seq
+        self._last_access_blocks_tracker.add_seq(seq.seq_id)
+
+        # Assign the block table for each sequence.
+        for seq in waiting_seqs[1:]:
+            self.block_tables[seq.seq_id] = block_table.fork()
+
+            # Track seq
+            self._last_access_blocks_tracker.add_seq(seq.seq_id)
+
+        # Allocate cross-attention block table for encoder sequence
+        #
+        # NOTE: Here we assume that all sequences in the group have the same
+        # encoder prompt.
+        request_id = seq_group.request_id
+
+        assert (request_id
+                not in self.cross_block_tables), \
+            "block table already exists"
+
+        check_no_caching_or_swa_for_blockmgr_encdec(self, seq_group)
+
+        if seq_group.is_encoder_decoder():
+            encoder_seq = seq_group.get_encoder_seq()
+            assert encoder_seq is not None
+            block_table = self._allocate_sequence(encoder_seq)
+            self.cross_block_tables[request_id] = block_table
+
+    def can_append_slots(self, seq_group: SequenceGroup,
+                         num_lookahead_slots: int) -> bool:
+        """Determine if there is enough space in the GPU KV cache to continue
+        generation of the specified sequence group.
+
+        We use a worst-case heuristic: assume each touched block will require a
+        new allocation (either via CoW or new block). We can append slots if the
+        number of touched blocks is less than the number of free blocks.
+
+        "Lookahead slots" are slots that are allocated in addition to the slots
+        for known tokens. The contents of the lookahead slots are not defined.
+        This is used by speculative decoding when speculating future tokens.
+        """
+
+        num_touched_blocks = 0
+        for seq in seq_group.get_seqs(status=SequenceStatus.RUNNING):
+            block_table = self.block_tables[seq.seq_id]
+
+            num_touched_blocks += (
+                block_table.get_num_blocks_touched_by_append_slots(
+                    token_ids=block_table.get_unseen_token_ids(
+                        seq.get_token_ids()),
+                    num_lookahead_slots=num_lookahead_slots,
+                ))
+
+        num_free_gpu_blocks = self.block_allocator.get_num_free_blocks(
+            Device.GPU, seq_id=seq.seq_id)
+        # NOTE: if False, trigger RECOMPUTE
+        return num_touched_blocks <= num_free_gpu_blocks
+
+    def append_slots(
+        self,
+        seq: Sequence,
+        num_lookahead_slots: int,
+    ) -> List[Tuple[int, int]]:
+
+        block_table = self.block_tables[seq.seq_id]
+
+        block_table.append_token_ids(
+            token_ids=block_table.get_unseen_token_ids(seq.get_token_ids()),
+            num_lookahead_slots=num_lookahead_slots,
+            num_computed_slots=seq.data.get_num_computed_tokens(),
+            extra_hash=seq.extra_hash(),
+            seq_id = seq.seq_id
+        )
+        # Return any new copy-on-writes.
+        new_cows = self.block_allocator.clear_copy_on_writes(seq.seq_id)
+        return new_cows
+
+    def free(self, seq: Sequence) -> None:
+        seq_id = seq.seq_id
+
+        if seq_id not in self.block_tables:
+            # Already freed or haven't been scheduled yet.
+            return
+
+        # Update seq block ids with the latest access time
+        self._last_access_blocks_tracker.update_seq_blocks_last_access(
+            seq_id, self.block_tables[seq.seq_id].physical_block_ids)
+
+        # Untrack seq
+        self._last_access_blocks_tracker.remove_seq(seq_id)
+        self._computed_blocks_tracker.remove_seq(seq_id)
+
+        # Free table/blocks
+        self.block_tables[seq_id].free(seq_id)
+        del self.block_tables[seq_id]
+        
+    def remove_seq_from_computed_blocks_tracker(self, seq: Sequence) -> None:
+        seq_id = seq.seq_id
+        self._computed_blocks_tracker.remove_seq(seq_id)
+        
+    def free_cross(self, seq_group: SequenceGroup) -> None:
+        request_id = seq_group.request_id
+        if request_id not in self.cross_block_tables:
+            # Already freed or hasn't been scheduled yet.
+            return
+        self.cross_block_tables[request_id].free()
+        del self.cross_block_tables[request_id]
+
+    def get_block_table(self, seq: Sequence) -> List[int]:
+        block_ids = self.block_tables[seq.seq_id].physical_block_ids
+        return block_ids  # type: ignore
+
+    def get_cross_block_table(self, seq_group: SequenceGroup) -> List[int]:
+        request_id = seq_group.request_id
+        assert request_id in self.cross_block_tables
+        block_ids = self.cross_block_tables[request_id].physical_block_ids
+        assert all(b is not None for b in block_ids)
+        return block_ids  # type: ignore
+
+    def access_all_blocks_in_seq(self, seq: Sequence, now: float):
+        if self.enable_caching:
+            # Record the latest access time for the sequence. The actual update
+            # of the block ids is deferred to the sequence free(..) call, since
+            # only during freeing of block ids, the blocks are actually added to
+            # the evictor (which is when the most updated time is required)
+            # (This avoids expensive calls to mark_blocks_as_accessed(..))
+            self._last_access_blocks_tracker.update_last_access(
+                seq.seq_id, now)
+
+    def mark_blocks_as_computed(self, seq_group: SequenceGroup,
+                                token_chunk_size: int):
+        # If prefix caching is enabled, mark immutable blocks as computed
+        # right after they have been scheduled (for prefill). This assumes
+        # the scheduler is synchronous so blocks are actually computed when
+        # scheduling the next batch.
+        self.block_allocator.mark_blocks_as_computed([])
+
+    def get_common_computed_block_ids(
+            self, seqs: List[Sequence]) -> GenericSequence[int]:
+        """Determine which blocks for which we skip prefill.
+
+        With prefix caching we can skip prefill for previously-generated blocks.
+        Currently, the attention implementation only supports skipping cached
+        blocks if they are a contiguous prefix of cached blocks.
+
+        This method determines which blocks can be safely skipped for all
+        sequences in the sequence group.
+        """
+        computed_seq_block_ids = []
+        for seq in seqs:
+            all_blocks = self.block_tables[seq.seq_id].physical_block_ids
+            num_cached_tokens = (
+                self._computed_blocks_tracker.get_num_cached_tokens(seq))
+            assert num_cached_tokens % self.block_size == 0
+            num_cached_blocks = num_cached_tokens // self.block_size
+            computed_block_ids = all_blocks[:num_cached_blocks]
+            computed_seq_block_ids.append(computed_block_ids)
+
+        # NOTE(sang): This assumes seq_block_ids doesn't contain any None.
+        return self.block_allocator.get_common_computed_block_ids(
+            computed_seq_block_ids)  # type: ignore
+
+    def fork(self, parent_seq: Sequence, child_seq: Sequence) -> None:
+        if parent_seq.seq_id not in self.block_tables:
+            # Parent sequence has either been freed or never existed.
+            return
+        src_block_table = self.block_tables[parent_seq.seq_id]
+        self.block_tables[child_seq.seq_id] = src_block_table.fork()
+
+        # Track child seq
+        self._last_access_blocks_tracker.add_seq(child_seq.seq_id)
+
+    def can_swap_in(self, seq_group: SequenceGroup,
+                    num_lookahead_slots: int) -> AllocStatus:
+        """Returns the AllocStatus for the given sequence_group 
+        with num_lookahead_slots.
+
+        Args:
+            sequence_group (SequenceGroup): The sequence group to swap in.
+            num_lookahead_slots (int): Number of lookahead slots used in 
+                speculative decoding, default to 0.
+
+        Returns:
+            AllocStatus: The AllocStatus for the given sequence group.
+        """
+        return self._can_swap(seq_group, Device.GPU, SequenceStatus.SWAPPED,
+                              num_lookahead_slots)
+
+    def swap_in(self, seq_group: SequenceGroup) -> List[Tuple[int, int]]:
+        """Returns the block id mapping (from CPU to GPU) generated by
+        swapping in the given seq_group with num_lookahead_slots.
+
+        Args:
+            seq_group (SequenceGroup): The sequence group to swap in.
+
+        Returns:
+            List[Tuple[int, int]]: The mapping of swapping block from CPU 
+                to GPU.
+        """
+        physical_block_id_mapping = []
+        for seq in seq_group.get_seqs(status=SequenceStatus.SWAPPED):
+            blocks = self.block_tables[seq.seq_id].blocks
+            if len(blocks) == 0:
+                continue
+
+            seq_swap_mapping = self.block_allocator.swap(blocks=blocks,
+                                                         src_device=Device.CPU,
+                                                         dst_device=Device.GPU)
+
+            # Refresh the block ids of the table (post-swap)
+            self.block_tables[seq.seq_id].update(blocks)
+
+            seq_physical_block_id_mapping = {
+                self.block_allocator.get_physical_block_id(
+                    Device.CPU, cpu_block_id):
+                self.block_allocator.get_physical_block_id(
+                    Device.GPU, gpu_block_id)
+                for cpu_block_id, gpu_block_id in seq_swap_mapping.items()
+            }
+
+            physical_block_id_mapping.extend(
+                list(seq_physical_block_id_mapping.items()))
+
+        return physical_block_id_mapping
+
+    def can_swap_out(self, seq_group: SequenceGroup) -> bool:
+        """Returns whether we can swap out the given sequence_group 
+        with num_lookahead_slots.
+
+        Args:
+            seq_group (SequenceGroup): The sequence group to swap out.
+            num_lookahead_slots (int): Number of lookahead slots used in 
+                speculative decoding, default to 0.
+
+        Returns:
+            bool: Whether it's possible to swap out current sequence group.
+        """
+        alloc_status = self._can_swap(seq_group, Device.CPU,
+                                      SequenceStatus.RUNNING)
+        return alloc_status == AllocStatus.OK
+
+    def swap_out(self, seq_group: SequenceGroup) -> List[Tuple[int, int]]:
+        """Returns the block id mapping (from GPU to CPU) generated by
+        swapping out the given sequence_group with num_lookahead_slots.
+
+        Args:
+            sequence_group (SequenceGroup): The sequence group to swap out.
+
+        Returns:
+            List[Tuple[int, int]]: The mapping of swapping block from 
+                GPU to CPU.
+        """
+        physical_block_id_mapping = []
+        for seq in seq_group.get_seqs(status=SequenceStatus.RUNNING):
+            blocks = self.block_tables[seq.seq_id].blocks
+            if len(blocks) == 0:
+                continue
+
+            seq_swap_mapping = self.block_allocator.swap(blocks=blocks,
+                                                         src_device=Device.GPU,
+                                                         dst_device=Device.CPU)
+
+            # Refresh the block ids of the table (post-swap)
+            self.block_tables[seq.seq_id].update(blocks)
+
+            seq_physical_block_id_mapping = {
+                self.block_allocator.get_physical_block_id(
+                    Device.GPU, gpu_block_id):
+                self.block_allocator.get_physical_block_id(
+                    Device.CPU, cpu_block_id)
+                for gpu_block_id, cpu_block_id in seq_swap_mapping.items()
+            }
+
+            physical_block_id_mapping.extend(
+                list(seq_physical_block_id_mapping.items()))
+
+        return physical_block_id_mapping
+
+    def get_num_free_gpu_blocks(self) -> int:
+        return self.block_allocator.get_num_free_blocks(Device.GPU)
+
+    def get_num_free_cpu_blocks(self) -> int:
+        return self.block_allocator.get_num_free_blocks(Device.CPU)
+
+    def get_prefix_cache_hit_rate(self, device: Device) -> float:
+        return self.block_allocator.get_prefix_cache_hit_rate(device)
+
+    def reset_prefix_cache(self, device: Optional[Device] = None) -> bool:
+        return self.block_allocator.reset_prefix_cache(device)
+
+    def _can_swap(self,
+                  seq_group: SequenceGroup,
+                  device: Device,
+                  status: SequenceStatus,
+                  num_lookahead_slots: int = 0) -> AllocStatus:
+        """Returns the AllocStatus for swapping in/out the given sequence_group 
+        on to the 'device'.
+
+        Args:
+            sequence_group (SequenceGroup): The sequence group to swap in/out.
+            device (Device): device to swap the 'seq_group' on.
+            status (SequenceStatus): The status of sequence which is needed
+                for action. RUNNING for swap out and SWAPPED for swap in
+            num_lookahead_slots (int): Number of lookahead slots used in 
+                speculative decoding, default to 0.
+
+        Returns:
+            AllocStatus: The AllocStatus for swapping in/out the given 
+                sequence_group on to the 'device'.
+        """
+        # First determine the number of blocks that will be touched by this
+        # swap. Then verify if there are available blocks in the device
+        # to perform the swap.
+        num_blocks_touched = 0
+        blocks: List[Block] = []
+        for seq in seq_group.get_seqs(status=status):
+            block_table = self.block_tables[seq.seq_id]
+            if block_table.blocks is not None:
+                # Compute the number blocks to touch for the tokens to be
+                # appended. This does NOT include the full blocks that need
+                # to be touched for the swap.
+                num_blocks_touched += \
+                    block_table.get_num_blocks_touched_by_append_slots(
+                        block_table.get_unseen_token_ids(seq.get_token_ids()),
+                        num_lookahead_slots=num_lookahead_slots)
+                blocks.extend(block_table.blocks)
+        # Compute the number of full blocks to touch and add it to the
+        # existing count of blocks to touch.
+        num_blocks_touched += self.block_allocator.get_num_full_blocks_touched(
+            blocks, device=device)
+
+        watermark_blocks = 0
+        if device == Device.GPU:
+            watermark_blocks = self.watermark_blocks
+
+        if self.block_allocator.get_num_total_blocks(
+                device) < num_blocks_touched:
+            return AllocStatus.NEVER
+        elif self.block_allocator.get_num_free_blocks(
+                device) - num_blocks_touched >= watermark_blocks:
+            return AllocStatus.OK
+        else:
+            return AllocStatus.LATER
+
+    def get_num_cached_tokens(self, seq: Sequence) -> int:
+        """Get the number of tokens in blocks that are already computed and
+        cached in the block manager for the sequence.
+        """
+        return self._computed_blocks_tracker.get_num_cached_tokens(seq)

vllm_vacc/vllm/distributed/communication_op.py

@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: Apache-2.0
+
+import torch
+import torch.distributed
+
+def tensor_model_parallel_all_reduce_with_odsp(input_: torch.Tensor) -> torch.Tensor:
+    """All-reduce the input tensor across model parallel group."""
+    from vllm.distributed import get_tp_group 
+    try:
+        total_bytes = input_.numel() * input_.element_size() * get_tp_group().world_size
+        # only support 4M now
+        if total_bytes < 4194304:
+            from torch_vacc.vacc import all_reduce
+            return all_reduce(input_, 
+                              get_tp_group().rank_in_group, 
+                              get_tp_group().world_size, 
+                              get_tp_group().group_id, 
+                              dev_info = get_tp_group().rank_device_infos)
+    except Exception as e:
+        print("all_reduce by DSP run Fail, now use vccl-ops", e, input_.shape, input_.dtype)
+
+    return get_tp_group().all_reduce(input_)
+

vllm_vacc/vllm/distributed/device_communicators/base_device_communicator.py

@@ -0,0 +1,24 @@
+import torch
+import torch.distributed as dist
+
+def all_gather_into_tensor(self, input_: torch.Tensor, dim: int = -1, output_tensor: torch.Tensor = None) -> torch.Tensor:
+    if dim < 0:
+        # Convert negative dim to positive.
+        dim += input_.dim()
+    input_size = input_.size()
+    # NOTE: we have to use concat-style all-gather here,
+    # stack-style all-gather has compatibility issues with
+    # torch.compile . see https://github.com/pytorch/pytorch/issues/138795
+    output_size = (input_size[0] * self.world_size, ) + input_size[1:]
+    # Allocate output tensor.
+    # [N,] => [N*world_size], 1D Tensor
+    if output_tensor is None:
+        output_tensor = torch.empty(output_size,
+                                    dtype=input_.dtype,
+                                    device=input_.device)
+    # print("o tensor is:", output_tensor.shape, "i tensor is:", input_.shape, input_size)
+    # All-gather.
+    dist.all_gather_into_tensor(output_tensor,
+                                input_,
+                                group=self.device_group)
+    return output_tensor

vllm_vacc/vllm/distributed/parallel_state.py

@@ -0,0 +1,485 @@
+
+
+import torch
+import torch.distributed
+from vllm.platforms import current_platform
+from vllm.utils import supports_custom_op
+
+from collections import namedtuple
+from typing import (Any, Dict, List, Optional, Tuple,
+                    Union)
+
+import torch
+import torch.distributed
+from torch.distributed import ProcessGroup
+
+from vllm.utils import supports_custom_op
+
+from vllm.distributed.parallel_state import TensorMetadata
+
+# memory recycler
+MEMORY_RECYCLER_KEY = ['previous_hidden_states']
+
+def _split_tensor_dict_concat(
+    tensor_dict: Dict[str, Union[torch.Tensor, Any]]
+) -> Tuple[List[Tuple[str, Any]], List[torch.Tensor]]:
+    """Split the tensor dictionary into two parts:
+    1. A list of (key, value) pairs. If the value is a tensor, it is replaced
+         by its metadata.
+    2. A list of tensors.
+    """
+    
+    # all_tensor_list = ['input_tokens','input_positions', 'slot_mapping','seq_lens_tensor', 'context_lens_tensor','block_tables', 'query_start_loc','seq_start_loc', 'selected_token_indices']
+    metadata_list: List[Tuple[str, Any]] = []
+    tensor_list: List[torch.Tensor] = []
+    all_tensor = []
+    all_tensor_numel = 0
+    for key, value in tensor_dict.items():
+        if isinstance(value, torch.Tensor):
+            # Note: we cannot use `value.device` here,
+            # because it contains not only the device type but also the device
+            # index (e.g. "cuda:0"). We only need the device type.
+            # receiving side will set the device index.
+            device = value.device.type
+            
+            if not value.is_cpu and value.numel() > 0:
+                value_bytes_tensor = value.view(torch.int8)
+                all_tensor.append(value_bytes_tensor.view([-1]))
+                all_tensor_numel += value_bytes_tensor.numel()
+                # tensor_list.append(value)
+            
+            metadata_list.append(
+            (key, TensorMetadata(device, value.dtype, value.size())))
+        
+        else:
+            metadata_list.append((key, value))
+    if len(all_tensor) != 0:
+
+        memory_recycler_dynamic_output = None
+        # 计算all_tensor的总大小
+        from vllm_vacc.vllm.model_executor.models.memory.memory_recycling import memory_recycler, DeepseekMTPMemoryRecycler
+        if isinstance(memory_recycler, DeepseekMTPMemoryRecycler):
+            memory_recycler_dynamic_output = memory_recycler.DYNAMIC_OUTPUT_BUFFER.view(torch.int8)[:all_tensor_numel]
+
+        if memory_recycler_dynamic_output is not None:
+            all_tensor = torch.concatenate(all_tensor, 0, out = memory_recycler_dynamic_output)
+        else:
+            all_tensor = torch.concatenate(all_tensor, 0)
+
+        tensor_list.append(all_tensor)
+        metadata_list.append(("all_tensor", TensorMetadata(all_tensor.device.type, all_tensor.dtype, all_tensor.size())))
+
+    return metadata_list, tensor_list
+
+def all_gather_to_rank0(self, input_: torch.Tensor, dim: int = -1) -> torch.Tensor:
+    world_size = self.world_size
+    # Bypass the function if we are using only 1 GPU.
+    if world_size == 1:
+        return input_
+    assert -input_.dim() <= dim < input_.dim(), (
+        f"Invalid dim ({dim}) for input tensor with shape {input_.size()}")
+
+    # For TPUs, use TPU communicator.
+    tpu_comm = self.tpu_communicator
+    if tpu_comm is not None and not tpu_comm.disabled:
+        return tpu_comm.all_gather(input_, dim)
+
+    # For HPUs, use HPU communicator.
+    hpu_comm = self.hpu_communicator
+    if hpu_comm is not None and not hpu_comm.disabled:
+        return hpu_comm.all_gather(input_, dim)
+
+    if dim < 0:
+        # Convert negative dim to positive.
+        dim += input_.dim()
+    input_size = input_.size()
+    # NOTE: we have to use concat-style all-gather here,
+    # stack-style all-gather has compatibility issues with
+    # torch.compile . see https://github.com/pytorch/pytorch/issues/138795
+    output_size = (input_size[0] * world_size, ) + input_size[1:]
+    
+    try:
+        total_bytes = input_.numel() * input_.element_size() * world_size
+        # only support 4M now
+        if total_bytes < 4194304:
+            from torch_vacc.vacc.custom_ops import all_gather
+            output_tensor = all_gather(input_, self.rank_in_group, self.world_size, self.group_id, 
+                                    dev_info = self.rank_device_infos)
+    
+            if self.rank_in_group != 0:
+                output_tensor = None
+            else:
+                output_tensor = output_tensor.movedim(0, dim)
+                output_tensor = output_tensor.reshape(input_size[:dim] +
+                                                    (world_size *
+                                                    input_size[dim], ) +
+                                                    input_size[dim + 1:])
+
+            return output_tensor
+    except Exception as e:
+        print("all_gather by DSP run Fail, now use vccl-ops", e, input_.shape, input_.dtype)
+
+    # Allocate output tensor.
+    output_tensor = torch.empty(output_size,
+                                dtype=input_.dtype,
+                                device=input_.device)
+    # All-gather.
+    torch.distributed.all_gather_into_tensor(output_tensor,
+                                                input_,
+                                                group=self.device_group)
+    if self.rank_in_group != 0:
+        output_tensor = None
+    else:
+        # Reshape
+        output_tensor = output_tensor.reshape((world_size, ) + input_size)
+        output_tensor = output_tensor.movedim(0, dim)
+        output_tensor = output_tensor.reshape(input_size[:dim] +
+                                            (world_size *
+                                            input_size[dim], ) +
+                                            input_size[dim + 1:])
+    return output_tensor
+
+def generate_group_id(self, group_id):
+    self.group_id = group_id
+
+def generate_rank_device_infos(self):
+    import numpy as np
+    import os
+    # encoder rank_dev_list
+    def combine_arrays(a, b):
+        a = np.asarray(a, dtype=np.uint32)
+        b = np.asarray(b, dtype=np.uint32)
+
+        if len(a) != len(b):
+            raise ValueError("两个数组的长度必须一致。")
+        
+        a_shifted = np.left_shift(a, 16)
+        combined = np.bitwise_or(a_shifted, b)
+        return combined.tolist()
+    
+    # decoder rank_dev_list
+    def uncombine_array(array):
+        array = np.asarray(array, dtype=np.uint32)
+        o_0 = array >> 16
+        o_1 = array << 16 >> 16
+        return o_0, o_1
+    
+    physical_devices = self.ranks
+    visible_devices = os.getenv('VACC_VISIBLE_DEVICES')
+    
+    if visible_devices is not None:
+        device_list = visible_devices.split(',')
+        device_count = len(device_list)
+        assert device_count >= len(self.ranks), f'VACC_VISIBLE_DEVICES:{device_count} is less than ranks:{len(self.ranks)}, please designate more devices'
+        physical_devices = [int(device_list[i]) for i in self.ranks]
+        # print("[vccl] logic_devices:physical_devices ", self.ranks, physical_devices)
+
+    logic_ranks = [self.ranks.index(rank) for rank in self.ranks]
+    self.rank_device_infos = combine_arrays(logic_ranks, physical_devices)
+
+def get_bitwidth(dtype):
+    if dtype.is_floating_point:
+        return torch.finfo(dtype).bits
+    else:
+        return torch.iinfo(dtype).bits
+
+class GroupCoordinator:
+    def all_reduce(self, input_: torch.Tensor) -> torch.Tensor:
+        """
+        User-facing all-reduce function before we actually call the
+        all-reduce operation.
+
+        We need this because Dynamo does not support passing an arbitrary
+        object (`self` in this case) to a custom op. We need to pass the
+         group name as a string, and then look up the group coordinator from
+         the group name, dispatch the all-reduce operation to the group
+         coordinator.
+
+        In addition, PyTorch custom ops do not support mutation or returning
+        a new tensor in the same op. So we need to figure out if the op is
+        in-place or out-of-place ahead of time.
+        """
+        # Bypass the function if we are using only 1 GPU.
+        if self.world_size == 1:
+            return input_
+        if input_.is_cpu:
+            import intel_extension_for_pytorch as ipex
+            ipex.distributed.all_reduce(input_, group=self.device_group)
+            return input_
+        
+        # vacc impl
+        # s0, s1 = input_.shape
+        # output_tensor = torch.empty([32, s0, s1],
+        #                             dtype=input_.dtype,
+        #                             device=input_.device)
+        # torch.distributed.all_gather_into_tensor(output_tensor,
+        #                                         input_,
+        #                                         group=self.device_group)
+        # input_ = output_tensor.sum(dim=0)
+        torch.distributed.all_reduce(input_, group=self.device_group)
+        return input_
+
+    def broadcast_tensor_dict(
+        self,
+        tensor_dict: Optional[Dict[str, Union[torch.Tensor, Any]]] = None,
+        src: int = 0,
+        group: Optional[ProcessGroup] = None,
+        metadata_group: Optional[ProcessGroup] = None
+    ) -> Optional[Dict[str, Union[torch.Tensor, Any]]]:
+        """Broadcast the input tensor dictionary.
+        NOTE: `src` is the local rank of the source rank.
+        """
+        
+        # all_tensor_list = ['input_tokens','input_positions', 'slot_mapping','seq_lens_tensor', 'context_lens_tensor','block_tables', 'query_start_loc','seq_start_loc', 'selected_token_indices']
+        
+        # Bypass the function if we are using only 1 GPU.
+        if (not torch.distributed.is_initialized() or self.world_size == 1):
+            return tensor_dict
+
+        group = self.device_group
+        metadata_group = self.cpu_group
+        assert src < self.world_size, f"Invalid src rank ({src})"
+        
+        rank_in_group = self.rank_in_group
+        
+        if rank_in_group == src:
+            metadata_list: List[Tuple[Any, Any]] = []
+            assert isinstance(
+                tensor_dict,
+                dict), (f"Expecting a dictionary, got {type(tensor_dict)}")
+            # metadata_list, tensor_list  = _split_tensor_dict(tensor_dict)
+            metadata_list, tensor_list = _split_tensor_dict_concat(tensor_dict)
+            # `metadata_list` lives in CPU memory.
+            # `broadcast_object_list` has serialization & deserialization,
+            # all happening on CPU. Therefore, we can use the CPU group.
+            # metadata_list 包含 （key, value） value是metadata 只有shape,没有数据
+            self.broadcast_object(metadata_list, src=src)
+            async_handles = []
+            for tensor in tensor_list:
+                if tensor.numel() == 0:
+                    # Skip broadcasting empty tensors.
+                    continue
+                if tensor.is_cpu:
+                    # use metadata_group for CPU tensors
+                    handle = torch.distributed.broadcast(tensor,
+                                                         src=self.ranks[src],
+                                                         group=metadata_group,
+                                                         async_op=True)
+                    async_handles.append(handle)
+                else:
+                    # use group for GPU tensors
+                    total_bytes = tensor.numel() * tensor.element_size()
+                    use_dist = True
+                    # only support 4M now
+                    if total_bytes < 4194304:
+                        try:
+                            from torch_vacc.vacc.custom_ops import broadcast
+                            #print("send tensor is:", tensor.shape, tensor.dtype, self.rank)
+                            broadcast(tensor, self.rank_in_group, self.world_size, root_rank=0, group_id=self.group_id,
+                                    dev_info = self.rank_device_infos)
+                            use_dist = False
+                        except Exception as e:
+                            print("odsp broadcast run fail, now using distributed:", e)
+                    
+                    if use_dist:
+                        handle = torch.distributed.broadcast(tensor,
+                                                            src=self.ranks[src],
+                                                            group=group,
+                                                            async_op=True)
+                        async_handles.append(handle)
+                
+            for async_handle in async_handles:
+                async_handle.wait()
+
+        else:
+            # other rank
+            metadata_list = self.broadcast_object(None, src=src)
+            tensor_dict = {}
+            async_handles = []
+            tensor_size = []  # list of [key, shape] for split all_tensor
+            dataType_list = []
+            for key, value in metadata_list:
+                # if rank_in_group == 1:
+                #     print('rank1 k v ', key, value)
+                if isinstance(value, TensorMetadata):
+                    tensor = None
+
+                    # 固定为int8
+                    from vllm_vacc.vllm.model_executor.models.memory.memory_recycling import memory_recycler, DeepseekMTPMemoryRecycler
+                    if isinstance(memory_recycler, DeepseekMTPMemoryRecycler) and value.dtype == torch.int8:
+                        tensor = memory_recycler.DYNAMIC_OUTPUT_BUFFER.view(value.dtype)[:value.size.numel()].view(value.size)
+
+                    if tensor is None:
+                        tensor = torch.empty(value.size,
+                                            dtype=value.dtype,
+                                            device=value.device)
+                    if tensor.numel() == 0:
+                        # Skip broadcasting empty tensors.
+                        tensor_dict[key] = tensor
+                        continue
+                    if tensor.is_cpu:
+                        # use metadata_group for CPU tensors
+                        handle = torch.distributed.broadcast(
+                            tensor,
+                            src=self.ranks[src],
+                            group=metadata_group,
+                            async_op=True)
+                        async_handles.append(handle)
+                        tensor_dict[key] = tensor
+                    else:
+                        # use group for GPU tensors 
+                        if key == "all_tensor":
+                            total_bytes = tensor.numel() * tensor.element_size()
+                            use_dist = True
+                            # only support 4M now
+                            if total_bytes < 4194304:
+                                try:      
+                                    from torch_vacc.vacc.custom_ops import broadcast
+                                    tensor = broadcast(tensor, self.rank_in_group, self.world_size, root_rank=0, group_id=self.group_id,
+                                            dev_info = self.rank_device_infos)
+                                    use_dist = False
+                                except Exception as e:
+                                    print("dsp brocast run fail, now using distributed:", e)
+                            
+                            if use_dist:
+                                handle = torch.distributed.broadcast(
+                                    tensor, #拼接的tensor
+                                    src=self.ranks[src],
+                                    group=group,
+                                    async_op=False)
+                            
+                            # 按 key shape对, 拆分 all_tensor, 存入tensor_dict
+                            start = 0
+                            idx = 0
+                            for ki_vi in tensor_size:
+                                ki, vi = ki_vi
+                                length = vi.numel() * int(get_bitwidth(dataType_list[idx]) / 8)
+                                if ki in MEMORY_RECYCLER_KEY:
+                                    tensor_dict[ki] = tensor[start:start+length].view(dataType_list[idx]).view(vi)
+                                else:
+                                    value_tensor = torch.empty(vi,
+                                            dtype=dataType_list[idx],
+                                            device=value.device)
+                                    recv_tensor = tensor[start:start+length].view(dataType_list[idx]).view(vi)
+                                    tensor_dict[ki] = value_tensor.copy_(recv_tensor)
+                                start += length
+                                idx += 1
+                        else:
+                            dataType_list.append(value.dtype)
+                            tensor_size.append([key, value.size])
+                else:
+                    tensor_dict[key] = value
+            for async_handle in async_handles: 
+                async_handle.wait() 
+        return tensor_dict
+    
+    def all_gather(self, input_: torch.Tensor, dim: int = -1, output_: torch.Tensor = None) -> torch.Tensor:
+        world_size = self.world_size
+        # Bypass the function if we are using only 1 GPU.
+        if world_size == 1:
+            return input_
+        assert -input_.dim() <= dim < input_.dim(), (
+            f"Invalid dim ({dim}) for input tensor with shape {input_.size()}")
+
+        if self.use_custom_op_call:
+            return torch.ops.vllm.all_gather(input_,
+                                             dim,
+                                             world_size,
+                                             group_name=self.unique_name)
+        else:
+            # 启用输出复用版的 all_gather
+            if output_ is not None:
+                return self.device_communicator.all_gather_into_tensor(input_, dim, output_)
+            return self._all_gather_out_place(input_, dim)
+        
+    def recv_tensor_dict(
+        self,
+        src: Optional[int] = None,
+        all_gather_group: Optional["GroupCoordinator"] = None,
+    ) -> Optional[dict[str, Union[torch.Tensor, Any]]]:
+        """Recv the input tensor dictionary.
+        NOTE: `src` is the local rank of the source rank.
+        """
+        # Bypass the function if we are using only 1 GPU.
+        if not torch.distributed.is_initialized() or self.world_size == 1:
+            return None
+        all_gather_size = (1 if all_gather_group is None else
+                           all_gather_group.world_size)
+        all_gather_rank = (0 if all_gather_group is None else
+                           all_gather_group.rank_in_group)
+
+        group = self.device_group
+        metadata_group = self.cpu_group
+
+        if src is None:
+            src = (self.rank_in_group - 1) % self.world_size
+        assert src < self.world_size, f"Invalid src rank ({src})"
+
+        recv_metadata_list = self.recv_object(src=src)
+        tensor_dict: dict[str, Any] = {}
+        from vllm_vacc.vllm.model_executor.models.memory.memory_recycling import alloc_pipeline_parallel_recycler_buffer
+        memory_recycler_list = ["hidden_states", "residual"]
+        for key, value in recv_metadata_list:
+            if isinstance(value, TensorMetadata):
+                # 判断是否需要内存复用
+                # 1. key在[hiddens, residual]中,说明为PP造成的
+                # 2. 可以根据key，从 memory_recycling 模块中申请到tensor
+                use_create_recycler_tensor = False
+                tensor = None
+                value_tensor = None # 用于接收all_gather总数据
+                if key in memory_recycler_list:
+                    tensor = alloc_pipeline_parallel_recycler_buffer(value.size, value.dtype, key)
+                    if tensor is not None:
+                        use_create_recycler_tensor = True
+                
+                if not use_create_recycler_tensor:
+                    tensor = torch.empty(value.size,
+                                        dtype=value.dtype,
+                                        device=value.device)
+                    
+                value_tensor = tensor    
+
+                if tensor.numel() == 0:
+                    # Skip broadcasting empty tensors.
+                    tensor_dict[key] = tensor
+                    continue
+
+                # send-allgather: send only a slice, then do allgather.
+                use_all_gather = (all_gather_group is not None
+                                  and tensor.numel() % all_gather_size == 0)
+
+                if use_all_gather:
+                    orig_shape = tensor.shape
+                    # 内存复用，无需reshape, view即可
+                    if use_create_recycler_tensor:
+                        tensor = tensor.view(all_gather_size,
+                                            -1)[all_gather_rank].contiguous()
+                    else:
+                        tensor = tensor.reshape(all_gather_size,
+                                                -1)[all_gather_rank]
+
+                if tensor.is_cpu:
+                    # use metadata_group for CPU tensors
+                    torch.distributed.recv(tensor,
+                                           src=self.ranks[src],
+                                           group=metadata_group)
+                else:
+                    # use group for GPU tensors
+                    torch.distributed.recv(tensor,
+                                           src=self.ranks[src],
+                                           group=group)
+                if use_all_gather:
+                    # do the allgather
+                    if use_create_recycler_tensor:
+                        tensor = all_gather_group.all_gather(  # type: ignore
+                            tensor, dim=0, output_ = value_tensor)
+                        tensor = tensor.view(orig_shape)
+                    else:
+                        tensor = all_gather_group.all_gather(  # type: ignore
+                            tensor, dim=0)
+                        tensor = tensor.reshape(orig_shape)
+
+                tensor_dict[key] = tensor
+            else:
+                tensor_dict[key] = value
+        return tensor_dict

vllm_vacc/vllm/engine/arg_utils.py

@@ -0,0 +1,158 @@
+import argparse
+import copy
+import dataclasses
+import functools
+import json
+import sys
+import threading
+import warnings
+from dataclasses import MISSING, dataclass, fields, is_dataclass
+from itertools import permutations
+from typing import (Annotated, Any, Callable, Dict, List, Literal, Optional,
+                    Type, TypeVar, Union, cast, get_args, get_origin)
+
+import regex as re
+import torch
+from pydantic import TypeAdapter, ValidationError
+from typing_extensions import TypeIs, deprecated
+
+import vllm.envs as envs
+from vllm.config import ModelConfig
+from vllm.executor.executor_base import ExecutorBase
+from vllm.logger import init_logger
+from vllm.model_executor.layers.quantization import QuantizationMethods
+from vllm.plugins import load_general_plugins
+from vllm.reasoning import ReasoningParserManager
+from vllm.test_utils import MODEL_WEIGHTS_S3_BUCKET, MODELS_ON_S3
+from vllm.transformers_utils.utils import check_gguf_file
+from vllm.usage.usage_lib import UsageContext
+from vllm.utils import (FlexibleArgumentParser, GiB_bytes, get_ip,
+                        is_in_ray_actor)
+from vllm.engine.arg_utils import EngineArgs
+from vllm.platforms import CpuArchEnum, current_platform
+
+logger = init_logger(__name__)
+
+def _set_default_args(self, usage_context: UsageContext,
+                        model_config: ModelConfig) -> None:
+    """Set Default Arguments for V1 Engine."""
+
+    # V1 always uses chunked prefills and prefix caching
+    # for non-pooling tasks.
+    # For pooling tasks the default is False
+    self.enable_chunked_prefill = False
+    self.enable_prefix_caching = False
+    if model_config.runner_type != "pooling":
+        # TODO: When prefix caching supports prompt embeds inputs, this
+        # check can be removed.
+        if (self.enable_prompt_embeds
+                and self.enable_prefix_caching is not False):
+            logger.warning(
+                "--enable-prompt-embeds and --enable-prefix-caching "
+                "are not supported together in V1. Prefix caching has "
+                "been disabled.")
+
+    # V1 should use the new scheduler by default.
+    # Swap it only if this arg is set to the original V0 default
+    if self.scheduler_cls == EngineArgs.scheduler_cls:
+        self.scheduler_cls = "vllm.v1.core.sched.scheduler.Scheduler"
+
+    # When no user override, set the default values based on the usage
+    # context.
+    # Use different default values for different hardware.
+
+    # Try to query the device name on the current platform. If it fails,
+    # it may be because the platform that imports vLLM is not the same
+    # as the platform that vLLM is running on (e.g. the case of scaling
+    # vLLM with Ray) and has no GPUs. In this case we use the default
+    # values for non-H100/H200 GPUs.
+    try:
+        device_memory = current_platform.get_device_total_memory()
+        device_name = current_platform.get_device_name().lower()
+    except Exception:
+        # This is only used to set default_max_num_batched_tokens
+        device_memory = 0
+
+    # NOTE(Kuntai): Setting large `max_num_batched_tokens` for A100 reduces
+    # throughput, see PR #17885 for more details.
+    # So here we do an extra device name check to prevent such regression.
+    from vllm.usage.usage_lib import UsageContext
+    if device_memory >= 70 * GiB_bytes and "a100" not in device_name:
+        # For GPUs like H100 and MI300x, use larger default values.
+        default_max_num_batched_tokens = {
+            UsageContext.LLM_CLASS: 16384,
+            UsageContext.OPENAI_API_SERVER: 8192,
+        }
+        default_max_num_seqs = {
+            UsageContext.LLM_CLASS: 1024,
+            UsageContext.OPENAI_API_SERVER: 1024,
+        }
+    else:
+        # TODO(woosuk): Tune the default values for other hardware.
+        default_max_num_batched_tokens = {
+            UsageContext.LLM_CLASS: 8192,
+            UsageContext.OPENAI_API_SERVER: 2048,
+        }
+        default_max_num_seqs = {
+            UsageContext.LLM_CLASS: 4,
+            UsageContext.OPENAI_API_SERVER: 4,
+        }
+
+    # tpu specific default values.
+    if current_platform.is_tpu():
+        default_max_num_batched_tokens_tpu = {
+            UsageContext.LLM_CLASS: {
+                'V6E': 2048,
+                'V5E': 1024,
+                'V5P': 512,
+            },
+            UsageContext.OPENAI_API_SERVER: {
+                'V6E': 1024,
+                'V5E': 512,
+                'V5P': 256,
+            }
+        }
+
+    # cpu specific default values.
+    if current_platform.is_cpu():
+        world_size = self.pipeline_parallel_size * self.tensor_parallel_size
+        default_max_num_batched_tokens = {
+            UsageContext.LLM_CLASS: 4096 * world_size,
+            UsageContext.OPENAI_API_SERVER: 2048 * world_size,
+        }
+        default_max_num_seqs = {
+            UsageContext.LLM_CLASS: 256 * world_size,
+            UsageContext.OPENAI_API_SERVER: 128 * world_size,
+        }
+
+    use_context_value = usage_context.value if usage_context else None
+    if (self.max_num_batched_tokens is None
+            and usage_context in default_max_num_batched_tokens):
+        if current_platform.is_tpu():
+            chip_name = current_platform.get_device_name()
+            if chip_name in default_max_num_batched_tokens_tpu[
+                    usage_context]:
+                self.max_num_batched_tokens = \
+                    default_max_num_batched_tokens_tpu[
+                        usage_context][chip_name]
+            else:
+                self.max_num_batched_tokens = \
+                    default_max_num_batched_tokens[usage_context]
+        else:
+            if not self.enable_chunked_prefill:
+                self.max_num_batched_tokens = model_config.max_model_len
+            else:
+                self.max_num_batched_tokens = \
+                    default_max_num_batched_tokens[usage_context]
+        logger.debug(
+            "Setting max_num_batched_tokens to %d for %s usage context.",
+            self.max_num_batched_tokens, use_context_value)
+
+    if (self.max_num_seqs is None
+            and usage_context in default_max_num_seqs):
+        self.max_num_seqs = min(default_max_num_seqs[usage_context],
+                                self.max_num_batched_tokens or sys.maxsize)
+
+        logger.debug("Setting max_num_seqs to %d for %s usage context.",
+                        self.max_num_seqs, use_context_value)
+

vllm_vacc/vllm/engine/llm_engine.py

@@ -0,0 +1,49 @@
+from vllm.engine.arg_utils import EngineArgs
+from vllm.usage.usage_lib import UsageContext
+from typing import Dict, Optional
+from vllm.engine.metrics_types import StatLoggerBase
+
+class LLMEngine:
+
+    @classmethod
+    def from_engine_args(
+        cls,
+        engine_args: EngineArgs,
+        usage_context: UsageContext = UsageContext.ENGINE_CONTEXT,
+        stat_loggers: Optional[Dict[str, StatLoggerBase]] = None,
+    ) -> "LLMEngine":
+        """Creates an LLM engine from the engine arguments."""
+        # Create the engine configs.
+        vllm_config = engine_args.create_engine_config(usage_context)
+        #patch to prevent num_speculative_tokens > 1
+        speculative_mode = hasattr(vllm_config, 'speculative_config')
+        if speculative_mode and \
+            hasattr(vllm_config.speculative_config, 'num_speculative_tokens') and \
+                vllm_config.speculative_config.num_speculative_tokens != 1:
+            raise ValueError(f'run_mp_engine: only support num_speculative_tokens == 1, but get {vllm_config.speculative_config.num_speculative_tokens}')
+        
+        default_model_infos = "default"
+        if speculative_mode:
+            if hasattr(vllm_config.speculative_config, 'method'):
+                default_model_infos = vllm_config.speculative_config.method
+                
+        from vllm_vacc.vllm.config_manager import vllm_vacc_config_manager
+        vllm_vacc_config_manager().update_model_infos(default_model_infos)
+
+        import vllm.envs as envs
+        engine_cls = None
+        if envs.VLLM_USE_V1:
+            from vllm.v1.engine.llm_engine import LLMEngine as V1LLMEngine
+            engine_cls = V1LLMEngine
+        else:
+            from vllm.engine.llm_engine import LLMEngine as DefaultEngine
+            engine_cls = DefaultEngine
+
+        assert engine_cls is not None, f"LLMEngine is empty: {engine_cls}"
+
+        return engine_cls.from_vllm_config(
+            vllm_config=vllm_config,
+            usage_context=usage_context,
+            stat_loggers=stat_loggers,
+            disable_log_stats=engine_args.disable_log_stats,
+        )

vllm_vacc/vllm/engine/metrics.py

@@ -0,0 +1,69 @@
+from vllm.engine.metrics_types import (StatLoggerBase, Stats)
+import vllm_vacc.vllm.model_executor.models.vars as global_vars 
+
+class LoggingStatLogger(StatLoggerBase):
+    """LoggingStatLogger is used in LLMEngine to log to Stdout."""
+
+    def log(self, stats: Stats) -> None:
+        from vllm.engine.metrics import local_interval_elapsed, get_throughput, logger
+        """Called by LLMEngine.
+           Logs to Stdout every self.local_interval seconds."""
+
+        # Save tracked stats for token counters.
+        self.num_prompt_tokens.append(stats.num_prompt_tokens_iter)
+        self.num_generation_tokens.append(stats.num_generation_tokens_iter)
+
+        # Update spec decode metrics
+        self.maybe_update_spec_decode_metrics(stats)
+
+        # Log locally every local_interval seconds.
+        if local_interval_elapsed(stats.now, self.last_local_log,
+                                  self.local_interval):
+            # Compute summary metrics for tracked stats (and log them
+            # to promethus if applicable).
+            prompt_throughput = get_throughput(self.num_prompt_tokens,
+                                               now=stats.now,
+                                               last_log=self.last_local_log)
+            generation_throughput = get_throughput(
+                self.num_generation_tokens,
+                now=stats.now,
+                last_log=self.last_local_log)
+
+            log_fn = logger.info
+            if not any((prompt_throughput, generation_throughput,
+                        self.last_prompt_throughput,
+                        self.last_generation_throughput)):
+                # Avoid log noise on an idle production system
+                log_fn = logger.debug
+
+            log_fn(
+                "Avg prompt throughput: %.1f tokens/s, "
+                "Avg generation throughput: %.1f tokens/s, "
+                "Running: %d reqs, Swapped: %d reqs, "
+                "Pending: %d reqs, GPU KV cache usage: %.1f%%, "
+                "CPU KV cache usage: %.1f%%., "
+                "Do sequences length: %s",
+                prompt_throughput,
+                generation_throughput,
+                stats.num_running_sys,
+                stats.num_swapped_sys,
+                stats.num_waiting_sys,
+                stats.gpu_cache_usage_sys * 100,
+                stats.cpu_cache_usage_sys * 100,
+                str(global_vars.DO_SEQ_LENS)
+            )
+            if (stats.cpu_prefix_cache_hit_rate >= 0
+                    or stats.gpu_prefix_cache_hit_rate >= 0):
+                log_fn(
+                    "Prefix cache hit rate: GPU: %.2f%%, CPU: %.2f%%",
+                    stats.gpu_prefix_cache_hit_rate * 100,
+                    stats.cpu_prefix_cache_hit_rate * 100,
+                )
+            if self.spec_decode_metrics is not None:
+                logger.debug(
+                    self._format_spec_decode_metrics_str(
+                        self.spec_decode_metrics))
+
+            self._reset(stats, prompt_throughput, generation_throughput)
+
+

vllm_vacc/vllm/engine/multiprocessing/engine.py

@@ -0,0 +1,103 @@
+from vllm.engine.multiprocessing import (ENGINE_DEAD_ERROR,
+                                         RPCError,
+                                         RPCProcessRequest,
+                                         RPCAbortRequest)
+from vllm.config import VllmConfig
+import signal
+from vllm.logger import init_logger
+from vllm.transformers_utils.config import (
+    maybe_register_config_serialize_by_value)
+from vllm.usage.usage_lib import UsageContext
+
+logger = init_logger(__name__)
+
+
+class MQLLMEngine:
+    
+    def _handle_process_request(self, request: RPCProcessRequest):
+        """Handle RPCProcessRequest by adding it to the LLMEngine."""
+        request_id = request.request_id
+
+        if self._errored_with is not None:
+            rpc_err = RPCError(request_id=request_id,
+                               is_engine_errored=True,
+                               exception=ENGINE_DEAD_ERROR(self._errored_with))
+            self._send_outputs(rpc_err)
+
+        try:
+            self.engine.add_request(
+                request_id=request_id,
+                prompt=request.prompt,
+                params=request.params,
+                lora_request=request.lora_request,
+                trace_headers=request.trace_headers,
+                prompt_adapter_request=request.prompt_adapter_request,
+                priority=request.priority)
+
+            if self.log_requests:
+                from vllm.engine.multiprocessing.engine import logger
+                
+                if request.prompt.get('prompt_token_ids') is not None:
+                    # logger.info("Added request: %s, %s, prompt length: %s", request.request_id, request.prompt['prompt_token_ids'], len(request.prompt['prompt_token_ids']))
+                    logger.info("Added request: %s, prompt length: %s", request.request_id, len(request.prompt['prompt_token_ids']))
+                else:
+                    logger.info("Added request %s.", request.request_id)
+
+        except Exception as e:
+            # We do not set self._errored = True here, since the error
+            # is due to an issue adding this request to the engine,
+            # rather than an issue with the engine itself.
+            is_errored = self._errored_with is not None
+            rpc_err = RPCError(request_id=request_id,
+                               is_engine_errored=is_errored,
+                               exception=e)
+            self._send_outputs(rpc_err)
+
+            # Remove request from the engine.
+            self.engine.abort_request(request_id)
+            
+    def _handle_abort_request(self, request: RPCAbortRequest):
+        self.engine.abort_request(request.request_id)
+        if self.log_requests:
+            from vllm.engine.multiprocessing.engine import logger
+            import vllm_vacc.vllm.model_executor.models.vars as global_vars 
+            logger.info("Aborted request: %s, prompt length: %s", request.request_id, global_vars.DO_SEQ_LENS)
+
+def run_mp_engine(vllm_config: VllmConfig, usage_context: UsageContext,
+                  ipc_path: str, disable_log_stats: bool,
+                  disable_log_requests: bool, engine_alive):
+    
+    #patch to prevent num_speculative_tokens > 1
+    speculative_mode = hasattr(vllm_config, 'speculative_config')
+    if speculative_mode and \
+        hasattr(vllm_config.speculative_config, 'num_speculative_tokens') and \
+            vllm_config.speculative_config.num_speculative_tokens != 1:
+        raise ValueError(f'run_mp_engine: only support num_speculative_tokens == 1, but get {vllm_config.speculative_config.num_speculative_tokens}')
+    
+    default_model_infos = "default"
+    if speculative_mode:
+        if hasattr(vllm_config.speculative_config, 'method'):
+            default_model_infos = vllm_config.speculative_config.method
+            
+    from vllm_vacc.vllm.config_manager import vllm_vacc_config_manager
+    vllm_vacc_config_manager().update_model_infos(default_model_infos)
+
+    try:
+        # Ensure we can serialize transformer config before spawning
+        maybe_register_config_serialize_by_value()
+        from vllm.engine.multiprocessing.engine import MQLLMEngine,signal_handler
+        engine = MQLLMEngine.from_vllm_config(
+            vllm_config=vllm_config,
+            usage_context=usage_context,
+            disable_log_stats=disable_log_stats,
+            disable_log_requests=disable_log_requests,
+            ipc_path=ipc_path)
+
+        signal.signal(signal.SIGTERM, signal_handler)
+
+        engine.start()
+
+    except BaseException as e:
+        logger.exception(e)
+        engine_alive.value = False
+        raise e

vllm_vacc/vllm/entrypoints/llm.py

@@ -0,0 +1,102 @@
+
+
+import itertools
+import warnings
+from collections.abc import Sequence
+from contextlib import contextmanager
+from typing import (TYPE_CHECKING, Any, Callable, ClassVar, Optional, Union,
+                    cast, overload)
+
+import cloudpickle
+import torch.nn as nn
+from pydantic import ValidationError
+from tqdm.auto import tqdm
+from typing_extensions import TypeVar, deprecated
+
+from vllm.entrypoints.utils import _validate_truncation_size
+from vllm.inputs import PromptType
+from vllm.logger import init_logger
+from vllm.lora.request import LoRARequest
+from vllm.pooling_params import PoolingParams
+from vllm.sampling_params import (RequestOutputKind, SamplingParams)
+from vllm.platforms import current_platform
+
+
+
+logger = init_logger(__name__)
+
+_R = TypeVar("_R", default=Any)
+
+class LLM:
+
+    EPRECATE_LEGACY: ClassVar[bool] = True
+    def _validate_and_add_requests(
+        self,
+        prompts: Union[PromptType, Sequence[PromptType]],
+        params: Union[SamplingParams, Sequence[SamplingParams], PoolingParams,
+                        Sequence[PoolingParams]],
+        *,
+        use_tqdm: Union[bool, Callable[..., tqdm]] = True,
+        lora_request: Optional[Union[Sequence[LoRARequest], LoRARequest]],
+        priority: Optional[list[int]] = None,
+    ) -> None:
+
+        if isinstance(prompts, (str, dict)):
+            # Convert a single prompt to a list.
+            prompts = [prompts]
+
+        num_requests = len(prompts)
+        if isinstance(params, Sequence) and len(params) != num_requests:
+            raise ValueError("The lengths of prompts and params "
+                                "must be the same.")
+        if isinstance(lora_request,
+                        Sequence) and len(lora_request) != num_requests:
+            raise ValueError("The lengths of prompts and lora_request "
+                                "must be the same.")
+
+        for sp in params if isinstance(params, Sequence) else (params, ):
+            if isinstance(sp, SamplingParams):
+                # We only care about the final output
+                sp.output_kind = RequestOutputKind.FINAL_ONLY
+
+        # Add requests to the engine.
+        it = prompts
+        if use_tqdm:
+            tqdm_func = use_tqdm if callable(use_tqdm) else tqdm
+            it = tqdm_func(it, desc="Adding requests")
+            
+        if (hasattr(current_platform, 'supports_v1') and current_platform.supports_v1(current_platform)):
+            batch_items = []
+            model_config = self.llm_engine.model_config
+            for i, prompt in enumerate(it):
+                request_id = str(next(self.request_counter))
+                # print("requset_id===========", request_id)
+                param = params[i] if isinstance(params, Sequence) else params
+                tokenization_kwargs: dict[str, Any] = {}
+                _validate_truncation_size(model_config.max_model_len,
+                                        param.truncate_prompt_tokens,
+                                        tokenization_kwargs)
+                
+                batch_items.append((
+                    request_id,
+                    prompt,
+                    params[i] if isinstance(params, Sequence) else params,
+                    None,  # arrival_time，不用的话传 None
+                    (lora_request[i] if isinstance(lora_request, Sequence)
+                    else lora_request),
+                    tokenization_kwargs,
+                    None,  # trace_headers（如无 APM/Tracing，None）
+                    (priority[i] if priority else 0),
+                ))
+            # 一次性下发给 EngineCore（走 ADD_BULK）
+            self.llm_engine.add_requests(batch_items)
+        else:
+            for i, prompt in enumerate(it):
+                self._add_request(
+                    prompt,
+                    params[i] if isinstance(params, Sequence) else params,
+                    tokenization_kwargs=tokenization_kwargs,
+                    lora_request=lora_request[i] if isinstance(
+                        lora_request, Sequence) else lora_request,
+                    priority=priority[i] if priority else 0,
+                )

vllm_vacc/vllm/entrypoints/openai/serving_completion.py

@@ -0,0 +1,345 @@
+
+import asyncio
+import time
+from collections.abc import AsyncGenerator, AsyncIterator
+from collections.abc import Sequence as GenericSequence
+from typing import Optional, Union, cast
+
+import jinja2
+from fastapi import Request
+from typing_extensions import assert_never
+from concurrent.futures.thread import ThreadPoolExecutor
+
+from vllm.config import ModelConfig
+from vllm.engine.protocol import EngineClient
+from vllm.entrypoints.logger import RequestLogger
+# yapf conflicts with isort for this block
+# yapf: disable
+from vllm.entrypoints.openai.protocol import (CompletionLogProbs,
+                                              CompletionRequest,
+                                              CompletionResponse,
+                                              CompletionResponseChoice,
+                                              CompletionResponseStreamChoice,
+                                              CompletionStreamResponse,
+                                              ErrorResponse,
+                                              RequestResponseMetadata,
+                                              UsageInfo)
+from vllm.entrypoints.openai.serving_engine import (
+    EmbedsPrompt as ServingEngineEmbedsPrompt)
+from vllm.entrypoints.openai.serving_engine import (OpenAIServing,
+                                                    TextTokensPrompt,
+                                                    clamp_prompt_logprobs,
+                                                    is_text_tokens_prompt)
+# yapf: enable
+from vllm.entrypoints.openai.serving_models import OpenAIServingModels
+from vllm.entrypoints.utils import get_max_tokens
+from vllm.inputs.data import (EmbedsPrompt, TokensPrompt, is_embeds_prompt,
+                              is_tokens_prompt)
+from vllm.logger import init_logger
+from vllm.outputs import RequestOutput
+from vllm.sampling_params import BeamSearchParams, SamplingParams
+from vllm.transformers_utils.tokenizer import AnyTokenizer
+from vllm.utils import merge_async_iterators
+from vllm.entrypoints.openai.serving_completion import OpenAIServingCompletion
+
+from vllm.entrypoints.openai.serving_completion import logger
+from vllm.utils import (is_list_of, make_async, merge_async_iterators,
+                        random_uuid)
+from vllm.utils import (AsyncMicrobatchTokenizer, is_list_of,
+                        merge_async_iterators, random_uuid)
+from vllm_vacc.vllm.model_executor.models.vars import LLM_MAX_PREFILL_SEQ_LEN
+
+
+class OpenAIServingCompletion(OpenAIServing):
+
+    def __init__(
+        self,
+        engine_client: EngineClient,
+        model_config: ModelConfig,
+        models: OpenAIServingModels,
+        *,
+        request_logger: Optional[RequestLogger],
+        return_tokens_as_token_ids: bool = False,
+        enable_prompt_tokens_details: bool = False,
+        enable_force_include_usage: bool = False,
+        enable_strict_batch_barrier: bool = True,
+        log_error_stack: bool = False,
+        ):
+
+        self.engine_client = engine_client
+        self.model_config = model_config
+        self.max_model_len = model_config.max_model_len
+
+        self.models = models
+
+        self.request_logger = request_logger
+        self.return_tokens_as_token_ids = return_tokens_as_token_ids
+        self.enable_force_include_usage = enable_force_include_usage
+
+        self._tokenizer_executor = ThreadPoolExecutor(max_workers=1)
+
+        self._async_tokenizer_pool: dict[AnyTokenizer,
+                                         AsyncMicrobatchTokenizer] = {}
+        self.log_error_stack = log_error_stack
+        
+        self.enable_prompt_tokens_details = enable_prompt_tokens_details
+        self.default_sampling_params = (
+            self.model_config.get_diff_sampling_param())
+        if self.default_sampling_params:
+            source = self.model_config.generation_config
+            source = "model" if source == "auto" else source
+            logger.info("Using default completion sampling params from %s: %s",
+                        source, self.default_sampling_params)
+        self.enable_strict_batch_barrier = enable_strict_batch_barrier
+
+    
+    async def create_completion(
+        self,
+        request: CompletionRequest,
+        raw_request: Optional[Request] = None,
+    ) -> Union[AsyncGenerator[str, None], CompletionResponse, ErrorResponse]:
+        """Completion API similar to OpenAI's API.
+
+        See https://platform.openai.com/docs/api-reference/completions/create
+        for the API specification. This API mimics the OpenAI Completion API.
+
+        NOTE: Currently we do not support the following feature:
+            - suffix (the language models we currently support do not support
+            suffix)
+        """
+        error_check_ret = await self._check_model(request)
+        if error_check_ret is not None:
+            return error_check_ret
+
+        # If the engine is dead, raise the engine's DEAD_ERROR.
+        # This is required for the streaming case, where we return a
+        # success status before we actually start generating text :).
+        if self.engine_client.errored:
+            raise self.engine_client.dead_error
+
+        # Return error for unsupported features.
+        if request.suffix is not None:
+            return self.create_error_response(
+                "suffix is not currently supported")
+
+        if request.echo and request.prompt_embeds is not None:
+            return self.create_error_response(
+                "Echo is unsupported with prompt embeds.")
+
+        if (request.prompt_logprobs is not None
+                and request.prompt_embeds is not None):
+            return self.create_error_response(
+                "prompt_logprobs is not compatible with prompt embeds.")
+
+        request_id = (
+            f"cmpl-"
+            f"{self._base_request_id(raw_request, request.request_id)}")
+        created_time = int(time.time())
+
+        request_metadata = RequestResponseMetadata(request_id=request_id)
+        if raw_request:
+            raw_request.state.request_metadata = request_metadata
+
+        try:
+            lora_request = self._maybe_get_adapters(request)
+
+            if self.model_config.skip_tokenizer_init:
+                tokenizer = None
+            else:
+                tokenizer = await self.engine_client.get_tokenizer()
+            renderer = self._get_renderer(tokenizer)
+
+            engine_prompts = await renderer.render_prompt_and_embeds(
+                prompt_or_prompts=request.prompt,
+                prompt_embeds=request.prompt_embeds,
+                deepstack_input_embeds=request.deepstack_input_embeds if hasattr(request, 'deepstack_input_embeds') else None,
+                config=self._build_render_config(request),
+            )
+        except ValueError as e:
+            logger.exception("Error in preprocessing prompt inputs")
+            return self.create_error_response(str(e))
+        except TypeError as e:
+            logger.exception("Error in preprocessing prompt inputs")
+            return self.create_error_response(str(e))
+        except RuntimeError as e:
+            logger.exception("Error in preprocessing prompt inputs")
+            return self.create_error_response(str(e))
+        except jinja2.TemplateError as e:
+            logger.exception("Error in preprocessing prompt inputs")
+            return self.create_error_response(str(e))
+
+        # Schedule the request and get the result generator.
+        generators: list[AsyncGenerator[RequestOutput, None]] = []
+        try:
+            total_num_prompts = len(engine_prompts)
+            for i, engine_prompt in enumerate(engine_prompts):
+                sampling_params: Union[SamplingParams, BeamSearchParams]
+                # Mypy does not infer that engine_prompt will have only one of
+                # "prompt_token_ids" or "prompt_embeds" defined, and both of
+                # these as Union[object, the expected type], where it infers
+                # object if engine_prompt is a subclass of one of the
+                # typeddicts that defines both keys. Worse, because of
+                # https://github.com/python/mypy/issues/8586, mypy does not
+                # infer the type of engine_prompt correctly because of the
+                # enumerate. So we need an unnecessary cast here.
+                engine_prompt = cast(Union[EmbedsPrompt, TokensPrompt],
+                                     engine_prompt)
+                if is_embeds_prompt(engine_prompt):
+                    input_length = len(engine_prompt["prompt_embeds"])
+                elif is_tokens_prompt(engine_prompt):
+                    input_length = len(engine_prompt["prompt_token_ids"])
+                    if input_length > LLM_MAX_PREFILL_SEQ_LEN:
+                        raise ValueError(
+                            f"This model's maximum input seq length limit is "
+                            f"{LLM_MAX_PREFILL_SEQ_LEN} tokens. However, you requested "
+                            f"({input_length} in the input messages, "
+                            f"Please reduce the length of the input messages.")
+                else:
+                    assert_never(engine_prompt)
+
+                if self.default_sampling_params is None:
+                    self.default_sampling_params = {}
+
+                max_tokens = get_max_tokens(
+                    max_model_len=self.max_model_len,
+                    request=request,
+                    input_length=input_length,
+                    default_sampling_params=self.default_sampling_params,
+                )
+
+                if request.use_beam_search:
+                    sampling_params = request.to_beam_search_params(
+                        max_tokens, self.default_sampling_params)
+                else:
+                    sampling_params = request.to_sampling_params(
+                        max_tokens,
+                        self.model_config.logits_processor_pattern,
+                        self.default_sampling_params,
+                    )
+                
+                # Inject strict batch barrier metadata so this batch is held
+                # until all items are ready, then scheduled together.
+                if (self.enable_strict_batch_barrier
+                        and total_num_prompts > 1
+                        and isinstance(sampling_params, SamplingParams)):
+                    if sampling_params.extra_args is None:
+                        sampling_params.extra_args = {}
+                    sampling_params.extra_args.setdefault("barrier_group_id",
+                                                          request_id)
+                    sampling_params.extra_args.setdefault("barrier_group_size",
+                                                          total_num_prompts)
+
+                request_id_item = f"{request_id}-{i}"
+
+                self._log_inputs(
+                    request_id_item,
+                    engine_prompt,
+                    params=sampling_params,
+                    lora_request=lora_request,
+                )
+
+                trace_headers = (None if raw_request is None else await
+                                 self._get_trace_headers(raw_request.headers))
+
+                # Mypy inconsistently requires this second cast in different
+                # environments. It shouldn't be necessary (redundant from above)
+                # but pre-commit in CI fails without it.
+                engine_prompt = cast(Union[EmbedsPrompt, TokensPrompt],
+                                     engine_prompt)
+                if isinstance(sampling_params, BeamSearchParams):
+                    generator = self.engine_client.beam_search(
+                        prompt=engine_prompt,
+                        request_id=request_id,
+                        params=sampling_params,
+                        lora_request=lora_request,
+                    )
+                else:
+                    generator = self.engine_client.generate(
+                        engine_prompt,
+                        sampling_params,
+                        request_id_item,
+                        lora_request=lora_request,
+                        trace_headers=trace_headers,
+                        priority=request.priority,
+                    )
+
+                generators.append(generator)
+        except ValueError as e:
+            # TODO: Use a vllm-specific Validation Error
+            logger.error(e)
+            return self.create_error_response(str(e))
+
+        result_generator = merge_async_iterators(*generators)
+
+        model_name = self.models.model_name(lora_request)
+        num_prompts = len(engine_prompts)
+
+        # Similar to the OpenAI API, when n != best_of, we do not stream the
+        # results. Noting that best_of is only supported in V0. In addition,
+        # we do not stream the results when use beam search.
+        stream = (request.stream
+                  and (request.best_of is None or request.n == request.best_of)
+                  and not request.use_beam_search)
+
+        # Streaming response
+        if stream:
+            return self.completion_stream_generator(
+                request,
+                engine_prompts,
+                result_generator,
+                request_id,
+                created_time,
+                model_name,
+                num_prompts=num_prompts,
+                tokenizer=tokenizer,
+                request_metadata=request_metadata,
+                enable_force_include_usage=self.enable_force_include_usage,
+            )
+
+        # Non-streaming response
+        final_res_batch: list[Optional[RequestOutput]] = [None] * num_prompts
+        try:
+            async for i, res in result_generator:
+                final_res_batch[i] = res
+
+            for i, final_res in enumerate(final_res_batch):
+                assert final_res is not None
+
+                # The output should contain the input text
+                # We did not pass it into vLLM engine to avoid being redundant
+                # with the inputs token IDs
+                if final_res.prompt is None:
+                    engine_prompt = engine_prompts[i]
+                    final_res.prompt = None if is_embeds_prompt(
+                        engine_prompt) else engine_prompt.get("prompt")
+
+            final_res_batch_checked = cast(list[RequestOutput],
+                                           final_res_batch)
+
+            response = self.request_output_to_completion_response(
+                final_res_batch_checked,
+                request,
+                request_id,
+                created_time,
+                model_name,
+                tokenizer,
+                request_metadata,
+            )
+        except asyncio.CancelledError:
+            return self.create_error_response("Client disconnected")
+        except ValueError as e:
+            # TODO: Use a vllm-specific Validation Error
+            return self.create_error_response(str(e))
+
+        # When user requests streaming but we don't stream, we still need to
+        # return a streaming response with a single event.
+        if request.stream:
+            response_json = response.model_dump_json()
+
+            async def fake_stream_generator() -> AsyncGenerator[str, None]:
+                yield f"data: {response_json}\n\n"
+                yield "data: [DONE]\n\n"
+
+            return fake_stream_generator()
+
+        return response

vllm_vacc/vllm/entrypoints/openai/serving_engine.py

@@ -0,0 +1,191 @@
+# SPDX-License-Identifier: Apache-2.0
+
+import json
+from concurrent.futures.thread import ThreadPoolExecutor
+from http import HTTPStatus
+from typing import (Any, Callable, Dict, Iterable, Iterator, List, Mapping,
+                    Optional, Sequence, Tuple, TypedDict, Union)
+
+from fastapi import Request
+from pydantic import Field
+from starlette.datastructures import Headers
+from typing_extensions import Annotated
+import torch
+
+from vllm.config import ModelConfig
+from vllm.engine.protocol import EngineClient
+# yapf conflicts with isort for this block
+# yapf: disable
+from vllm.entrypoints.chat_utils import (ChatCompletionMessageParam,
+                                         ChatTemplateContentFormatOption,
+                                         ConversationMessage,
+                                         apply_hf_chat_template,
+                                         apply_mistral_chat_template,
+                                         parse_chat_messages_futures,
+                                         resolve_chat_template_content_format)
+from vllm.entrypoints.logger import RequestLogger
+from vllm.entrypoints.openai.protocol import (ChatCompletionRequest,
+                                              CompletionRequest,
+                                              DetokenizeRequest,
+                                              EmbeddingChatRequest,
+                                              EmbeddingCompletionRequest,
+                                              ErrorResponse, RerankRequest,
+                                              ScoreRequest,
+                                              TokenizeChatRequest,
+                                              TokenizeCompletionRequest)
+# yapf: enable
+from vllm.logger import init_logger
+from vllm.lora.request import LoRARequest
+from vllm.pooling_params import PoolingParams
+from vllm.sampling_params import BeamSearchParams, SamplingParams
+from vllm.entrypoints.openai.serving_engine import AnyRequest, TextTokensPrompt
+# from vllm.model_executor.sampling_metadata import  _SAMPLING_EPS
+from vllm.v1.sample.sampler import _SAMPLING_EPS
+import os
+
+logger = init_logger(__name__)
+
+from vllm_vacc.vllm.model_executor.models.vars import LLM_MAX_PREFILL_SEQ_LEN
+from vllm_vacc.vllm.model_executor.models.vars import CUT_PREFILL_SEQ_LEN
+
+class EmbedsPrompt(TypedDict):
+    prompt_embeds: torch.Tensor
+    deepstack_input_embeds: Optional[dict]
+
+class OpenAIServing:
+    def _validate_input(
+        self,
+        request: AnyRequest,
+        input_ids: List[int],
+        input_text: str,
+    ) -> TextTokensPrompt:
+        # clint 设置的参数， 如果没有设， 还会再从 generation_config.json 读取
+        if CUT_PREFILL_SEQ_LEN > 0 and CUT_PREFILL_SEQ_LEN < len(input_ids):
+            cut_before = CUT_PREFILL_SEQ_LEN // 2
+            cut_after = CUT_PREFILL_SEQ_LEN - cut_before
+            input_ids = input_ids[:cut_before] + input_ids[(-1)*cut_after:]
+        token_num = len(input_ids)
+
+        if not self.model_config.pooler_config:
+            if (request.repetition_penalty is not None and abs(request.repetition_penalty - 1.0) >= _SAMPLING_EPS):
+                     raise ValueError(
+                        f"unsupport penalty for sampler"
+                        f"request.repetition_penalty: {request.repetition_penalty}; "
+                        f"Please remove penalty parameter in client and try again."
+                        )
+            if  request.min_p is not None and request.min_p > _SAMPLING_EPS:
+                raise ValueError(f"unsupport min_p {request.min_p} for sampler")
+            if  request.prompt_logprobs is not None:
+                raise ValueError(f"unsupport prompt_logprobs {request.prompt_logprobs} for sampler")
+        
+            if  request.min_p is not None and request.min_p > _SAMPLING_EPS:
+                raise ValueError(f"unsupport min_p {request.min_p} for sampler")
+            if  request.prompt_logprobs is not None:
+                raise ValueError(f"unsupport prompt_logprobs {request.prompt_logprobs} for sampler")
+        
+        # model_type = self.model_config.hf_config.model_type
+        # if model_type == "deepseek_v3":
+        if token_num > LLM_MAX_PREFILL_SEQ_LEN:
+            raise ValueError(
+                f"This model's maximum input seq length limit is "
+                f"{LLM_MAX_PREFILL_SEQ_LEN} tokens. However, you requested "
+                f"({token_num} in the input messages, "
+                f"Please reduce the length of the input messages.")
+
+        # Note: EmbeddingRequest and ScoreRequest doesn't have max_tokens
+        if isinstance(request,
+                      (EmbeddingChatRequest, EmbeddingCompletionRequest,
+                       ScoreRequest, RerankRequest)):
+
+            operation = "score" if isinstance(request, ScoreRequest) \
+                else "embedding generation"
+            if token_num > self.max_model_len:
+                raise ValueError(
+                    f"This model's maximum context length is "
+                    f"{self.max_model_len} tokens. However, you requested "
+                    f"{token_num} tokens in the input for {operation}. "
+                    f"Please reduce the length of the input.")
+            return TextTokensPrompt(prompt=input_text,
+                                    prompt_token_ids=input_ids)
+
+        # Note: TokenizeRequest and DetokenizeRequest doesn't have max_tokens
+        # and does not require model context length validation
+        if isinstance(request, (TokenizeCompletionRequest, TokenizeChatRequest,
+                                DetokenizeRequest)):
+            return TextTokensPrompt(prompt=input_text,
+                                    prompt_token_ids=input_ids)
+
+        # chat completion endpoint supports max_completion_tokens
+        if isinstance(request, ChatCompletionRequest):
+            # TODO(#9845): remove max_tokens when field dropped from OpenAI API
+            max_tokens = request.max_completion_tokens or request.max_tokens
+        else:
+            max_tokens = request.max_tokens
+        if max_tokens is None:
+            if token_num >= self.max_model_len:
+                raise ValueError(
+                    f"This model's maximum context length is "
+                    f"{self.max_model_len} tokens. However, you requested "
+                    f"{token_num} tokens in the messages, "
+                    f"Please reduce the length of the messages.")
+        elif token_num + max_tokens > self.max_model_len:
+            raise ValueError(
+                f"This model's maximum context length is "
+                f"{self.max_model_len} tokens. However, you requested "
+                f"{max_tokens + token_num} tokens "
+                f"({token_num} in the messages, "
+                f"{max_tokens} in the completion). "
+                f"Please reduce the length of the messages or completion.")
+                
+
+        return TextTokensPrompt(prompt=input_text, prompt_token_ids=input_ids)
+
+    def _log_inputs(
+        self,
+        request_id: str,
+        inputs,
+        params: Optional[Union[SamplingParams, PoolingParams,
+                               BeamSearchParams]],
+        lora_request: Optional[LoRARequest],
+    ) -> None:
+        # move to position where before use request_logger
+        # if self.request_logger is None:
+        #     return
+        # if self.model_config.pooler_config is not None, task is embedding , not generation task
+        if self.model_config.pooler_config:
+            return
+        prompt, prompt_token_ids, prompt_embeds = None, None, None
+        if isinstance(inputs, str):
+            prompt = inputs
+        elif isinstance(inputs, list):
+            prompt_token_ids = inputs
+        else:
+            prompt = getattr(inputs, 'prompt', None)
+            prompt_token_ids = getattr(inputs, 'prompt_token_ids', None)
+
+        # generation_config 读取的惩罚信息， 如果有，则警告并且修改
+        if (params.repetition_penalty is not None and abs(params.repetition_penalty - 1.0) >= _SAMPLING_EPS):
+            logger.warning(
+                        "\033[93mWARNING \033[0m"
+                        ": Unsupport penalty for sampler"
+                        f"params.repetition_penalty: {params.repetition_penalty} and "
+                        "Please set attrs: extra_body = {\'repetition_penalty\': 1.0}\n"
+                        "Now set: repetition_penalty: 1.0"
+                    )
+            # params.presence_penalty = 0
+            # params.frequency_penalty = 0
+            params.repetition_penalty = 1
+            
+        if hasattr(params, "min_p") and params.min_p is not None and params.min_p > _SAMPLING_EPS:
+            logger.warning(f"\033[93mWARNING \033[0m : unsupport min_p {params.min_p} for sampler")
+            params.min_p = 0
+        if self.request_logger is None:
+            return
+        self.request_logger.log_inputs(
+            request_id,
+            prompt,
+            prompt_token_ids,
+            prompt_embeds,
+            params=params,
+            lora_request=lora_request,
+        )

vllm_vacc/vllm/entrypoints/renderer.py

@@ -0,0 +1,127 @@
+
+
+import asyncio
+import io
+from abc import ABC, abstractmethod
+from dataclasses import dataclass
+from typing import Annotated, Optional, Union
+
+import pybase64
+import torch
+from pydantic import Field
+
+from vllm.config import ModelConfig
+from vllm.inputs.data import EmbedsPrompt as EngineEmbedsPrompt
+from vllm.inputs.data import TokensPrompt as EngineTokensPrompt
+from vllm.inputs.parse import parse_and_batch_prompt
+from vllm.transformers_utils.tokenizer import AnyTokenizer
+from vllm.utils import AsyncMicrobatchTokenizer
+
+
+
+class BaseRenderer(ABC):
+    """
+    Base class for unified input processing and rendering.
+    
+    The Renderer serves as a unified input processor that consolidates
+    tokenization, chat template formatting, and multimodal input handling
+    into a single component.
+    It converts high-level API requests (OpenAI-style JSON) into token IDs and
+    multimodal features ready for engine consumption.
+    
+    Key responsibilities:
+    - Convert text prompts to token sequences with proper special tokens
+    - Apply chat templates and format conversations
+    - Handle multimodal inputs (images, audio, etc.) when applicable
+    - Manage prompt truncation and length validation
+    - Provide clean separation between API layer and engine core
+    """
+
+    @classmethod
+    def load_prompt_embeds(
+        cls,
+        prompt_embeds: Union[bytes, list[bytes]],
+        deepstack_input_embeds: Optional[dict[str, Union[bytes, str]]] = None,
+        truncate_prompt_tokens: Optional[Annotated[int, Field(ge=0)]] = None,
+        cache_salt: Optional[str] = None,
+    ) -> list[EngineEmbedsPrompt]:
+        """Load and validate base64-encoded embeddings into prompt objects."""
+
+        def _load_and_validate_embed(embed: bytes) -> EngineEmbedsPrompt:
+            tensor = torch.load(
+                io.BytesIO(pybase64.b64decode(embed, validate=True)),
+                weights_only=True,
+                map_location=torch.device("cpu"),
+            )
+            assert isinstance(tensor, torch.Tensor) and tensor.dtype in (
+                torch.float32,
+                torch.bfloat16,
+                torch.float16,
+            )
+            tensor = tensor.to_dense()
+            if tensor.dim() > 2:
+                tensor = tensor.squeeze(0)
+                assert tensor.dim() == 2
+            if truncate_prompt_tokens is not None:
+                tensor = tensor[-truncate_prompt_tokens:]
+            embeds_prompt = EngineEmbedsPrompt(prompt_embeds=tensor)
+            if cache_salt is not None:
+                embeds_prompt["cache_salt"] = cache_salt
+                
+            if deepstack_input_embeds is not None:
+                all_tensor = []
+                from vllm.sequence import IntermediateTensors
+                tensor_dict = torch.load(
+                    io.BytesIO(pybase64.b64decode(deepstack_input_embeds, validate=True))
+                )
+                for k in tensor_dict:
+                    all_tensor.append(tensor_dict[k].unsqueeze(0))
+                
+                all_tensor = torch.concatenate(all_tensor, 0)
+                embeds_prompt["deepstack_input_embeds"] = all_tensor #IntermediateTensors(tensors=tensor_dict)
+                
+            return embeds_prompt
+
+        if isinstance(prompt_embeds, list):
+            return [_load_and_validate_embed(embed) for embed in prompt_embeds]
+
+        return [_load_and_validate_embed(prompt_embeds)]
+
+
+
+class CompletionRenderer(BaseRenderer):
+
+    async def render_prompt_and_embeds(
+        self,
+        *,
+        prompt_or_prompts: Optional[Union[str, list[str], list[int],
+                                          list[list[int]]]] = None,
+        prompt_embeds: Optional[Union[bytes, list[bytes]]] = None,
+        deepstack_input_embeds: Optional[Union[bytes, list[bytes]]] = None,
+        config: "RenderConfig",
+    ) -> list[Union[EngineTokensPrompt, EngineEmbedsPrompt]]:
+        """
+        Render text/token prompts and/or precomputed embedding prompts. At
+        least one of `prompt_or_prompts` or `prompt_embeds` must be provided.
+        """
+        truncate_prompt_tokens = self._validate_and_normalize_truncate_tokens(
+            config.truncate_prompt_tokens, config.max_length)
+        if truncate_prompt_tokens == 0:
+            return []
+
+        rendered: list[Union[EngineTokensPrompt, EngineEmbedsPrompt]] = []
+
+        if prompt_embeds is not None:
+            rendered.extend(
+                self.load_prompt_embeds(prompt_embeds, deepstack_input_embeds, truncate_prompt_tokens, 
+                                        config.cache_salt))
+        if prompt_or_prompts is None or prompt_or_prompts == "":
+            return rendered
+
+        token_prompts = await self.render_prompt(
+            prompt_or_prompts=prompt_or_prompts,
+            config=config,
+        )
+        rendered.extend(token_prompts)
+
+        return rendered

vllm_vacc/vllm/executor/executor_base.py

@@ -0,0 +1,20 @@
+import asyncio
+from typing import List
+
+from vllm.v1.outputs import PoolerOutput, SamplerOutput
+from vllm.sequence import ExecuteModelRequest
+
+# class DistributedExecutorBase():
+#     """Abstract superclass of distributed executor implementations."""
+
+async def execute_model_async(
+        self,
+        execute_model_req: ExecuteModelRequest) -> List[SamplerOutput]:
+    if self.parallel_worker_tasks is None:
+        # Start model execution loop running in the parallel workers
+        self.parallel_worker_tasks = asyncio.create_task(
+            self._start_worker_execution_loop())
+        await asyncio.sleep(0)
+    # Only the driver worker returns the sampling results.
+    await asyncio.sleep(0)
+    return await self._driver_execute_model_async(execute_model_req)

vllm_vacc/vllm/inputs/data.py

@@ -0,0 +1,55 @@
+
+
+from collections.abc import Iterable
+from typing import TYPE_CHECKING, Any, Generic, Literal, Optional, Union, cast
+
+import torch
+from typing_extensions import NotRequired, TypedDict, TypeIs, TypeVar
+
+if TYPE_CHECKING:
+    from vllm.multimodal.inputs import (MultiModalDataDict, MultiModalInputs,
+                                        MultiModalUUIDDict)
+
+class EmbedsPrompt(TypedDict):
+    """Schema for a prompt provided via token embeddings."""
+
+    prompt_embeds: torch.Tensor
+    """The embeddings of the prompt."""
+    from vllm.sequence import IntermediateTensors
+    deepstack_input_embeds: Optional[IntermediateTensors]
+    cache_salt: NotRequired[str]
+    """
+    Optional cache salt to be used for prefix caching.
+    """
+
+
+
+class EmbedsInputs(TypedDict):
+    """Represents embeddings-based inputs."""
+
+    type: Literal["embeds"]
+    """The type of inputs."""
+
+    prompt_embeds: torch.Tensor
+    """The embeddings of the prompt."""
+    deepstack_input_embeds: torch.Tensor
+
+    cache_salt: NotRequired[str]
+    """
+    Optional cache salt to be used for prefix caching.
+    """
+
+
+def embeds_inputs(
+    prompt_embeds: torch.Tensor,
+    deepstack_input_embeds: torch.Tensor,
+    cache_salt: Optional[str] = None,
+) -> EmbedsInputs:
+    """Construct [`EmbedsInputs`][vllm.inputs.data.EmbedsInputs] from optional
+    values."""
+    inputs = EmbedsInputs(type="embeds", prompt_embeds=prompt_embeds, deepstack_input_embeds=deepstack_input_embeds)
+
+    if cache_salt is not None:
+        inputs["cache_salt"] = cache_salt
+
+    return inputs

vllm_vacc/vllm/inputs/preprocess.py

@@ -0,0 +1,54 @@
+
+
+from collections.abc import Mapping
+from typing import Any, Optional, Union, cast
+
+from typing_extensions import assert_never
+
+from vllm.config import ModelConfig
+from vllm.logger import init_logger
+from vllm.multimodal import MULTIMODAL_REGISTRY, MultiModalRegistry
+from vllm.multimodal.cache import BaseMultiModalProcessorCache
+from vllm.multimodal.inputs import (MultiModalDataDict, MultiModalEncDecInputs,
+                                    MultiModalInputs, MultiModalUUIDDict)
+from vllm.multimodal.processing import BaseMultiModalProcessor
+from vllm.transformers_utils.tokenizer import AnyTokenizer
+
+from .data import EmbedsInputs, EmbedsPrompt, embeds_inputs
+
+logger = init_logger(__name__)
+
+
+class InputPreprocessor:
+    def _process_embeds(
+        self,
+        parsed_content: EmbedsPrompt,
+    ) -> EmbedsInputs:
+        if not self.model_config.enable_prompt_embeds:
+            raise ValueError("You must set `--enable-prompt-embeds` to input "
+                             "`prompt_embeds`.")
+
+        prompt_embeds = parsed_content["prompt_embeds"]
+        deepstack_input_embeds = None
+        if 'deepstack_input_embeds' in parsed_content:
+            deepstack_input_embeds = parsed_content["deepstack_input_embeds"]
+
+        # prompt_embeds must be (seq_len, hidden_size), but if the user
+        # passes in a batch of size 1, i.e. (1, seq_len, hidden_size),
+        # we can unambiguously process the intent by squeezing the batch
+        # dimension.
+        if prompt_embeds.ndim == 3:
+            prompt_embeds = prompt_embeds.squeeze(dim=0)
+
+        if prompt_embeds.ndim != 2:
+            raise ValueError(
+                "prompt_embeds must be of shape (seq_len, hidden_size).")
+
+        # Tensors must be on CPU for serialization between processes
+        # in the MsgpackEncoder. Casting to CPU here ensures that there is no
+        # hidden device transfer in the critical path of generation.
+        prompt_embeds = prompt_embeds.cpu()
+
+        return embeds_inputs(prompt_embeds=prompt_embeds,
+                             deepstack_input_embeds=deepstack_input_embeds,
+                             cache_salt=parsed_content.get("cache_salt"))

vllm_vacc/vllm/model_executor/custom_op.py

@@ -0,0 +1,38 @@
+
+import torch.nn as nn
+from vllm.logger import init_logger
+
+logger = init_logger(__name__)
+
+class CustomOp(nn.Module):
+    
+    def forward_vacc(self, *args, **kwargs):
+        raise NotImplementedError
+    
+    def dispatch_forward(self):
+        # NOTE(woosuk): Here we assume that vLLM was built for only one
+        # specific backend. Currently, we do not support dynamic dispatching.
+
+        enabled = self.enabled()
+        logger.debug("custom op %s %s", self.__class__.name,
+                     "enabled" if enabled else "disabled")
+
+        if not enabled:
+            return self.forward_native
+
+        return self.forward
+
+        if current_platform.is_rocm():
+            return self.forward_hip
+        elif current_platform.is_cpu():
+            return self.forward_cpu
+        elif current_platform.is_hpu():
+            return self.forward_hpu
+        elif current_platform.is_tpu():
+            return self.forward_tpu
+        elif current_platform.is_xpu():
+            return self.forward_xpu
+        elif current_platform.is_vacc():
+            return self.forward
+        else:
+            return self.forward_cuda