[Feature] support eager mode in model runner v2 (#5210)

### What this PR does / why we need it?
#5051 only implement a basic framework for model runner v2, but there
are still some bugs for e2e functionality, this PR aim to enable basic
functionality.
model runner v2 plans:
https://github.com/vllm-project/vllm-ascend/issues/5208

- vLLM version: release/v0.13.0
- vLLM main:
ad32e3e19c
---------
Signed-off-by: Ronald1995 <ronaldautomobile@163.com>

.github/workflows/_e2e_test.yaml

@@ -125,6 +125,8 @@ jobs:
           pytest -sv --durations=0 tests/e2e/singlecard/spec_decode_v1/test_v1_mtp_correctness.py
           pytest -sv --durations=0 tests/e2e/singlecard/spec_decode_v1/test_v1_spec_decode.py
 
+          pytest -sv --durations=0 tests/e2e/singlecard/model_runner_v2/test_basic.py
+
   e2e-2-cards:
     name: multicard-2
     runs-on: linux-aarch64-a3-2

tests/e2e/singlecard/model_runner_v2/test_basic.py

@@ -0,0 +1,51 @@
+#
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+# Copyright 2023 The vLLM team.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import os
+from unittest.mock import patch
+
+import pytest
+from vllm import SamplingParams
+
+from tests.e2e.conftest import VllmRunner
+
+MODELS = ["Qwen/Qwen3-0.6B"]
+
+
+@pytest.mark.parametrize("model", MODELS)
+@pytest.mark.parametrize("max_tokens", [32])
+@pytest.mark.parametrize("enforce_eager", [True])
+@patch.dict(os.environ, {"VLLM_USE_V2_MODEL_RUNNER": "1"})
+def test_qwen3_dense_eager_mode(
+    model: str,
+    max_tokens: int,
+    enforce_eager: bool,
+) -> None:
+    prompts = [
+        "Hello, my name is",
+        "The president of the United States is",
+        "The capital of France is",
+        "The future of AI is",
+    ]
+
+    sampling_params = SamplingParams(max_tokens=max_tokens, temperature=0.0)
+    with VllmRunner(
+            model,
+            max_model_len=1024,
+            enforce_eager=enforce_eager,
+    ) as runner:
+        runner.model.generate(prompts, sampling_params)

vllm_ascend/attention/attention_v1.py

@@ -21,6 +21,7 @@ from typing import ClassVar, List, Optional, Tuple, Type
 
 import torch
 import torch_npu
+import vllm.envs as envs_vllm
 from vllm.attention.backends.abstract import (AttentionBackend, AttentionImpl,
                                               AttentionLayer, AttentionType)
 from vllm.attention.backends.registry import (AttentionBackendEnum,
@@ -54,7 +55,10 @@ class AscendAttentionBackend(AttentionBackend):
 
     @staticmethod
     def get_name() -> str:
-        return "CUSTOM"
+        # HACK(Ronald1995): vllm `initialize_kv_cache` method in model runner v2 make
+        # attention name assertion, we just set name to FLASH_ATTN to avoid assertion error.
+        # rectify this when vllm disable the assertion.
+        return "CUSTOM" if not envs_vllm.VLLM_USE_V2_MODEL_RUNNER else "FLASH_ATTN"
 
     @staticmethod
     def get_impl_cls() -> Type["AscendAttentionBackendImpl"]:
@@ -535,7 +539,10 @@ class AscendAttentionBackendImpl(AttentionImpl):
                                       attn_metadata: AscendMetadata,
                                       output: torch.Tensor):
         forward_context: ForwardContext = get_forward_context()
-        if forward_context.capturing:
+        # we inherit ForwardContext in model runner v2, when enable model
+        # runner v2, there is not capturing attribute in forward_context,
+        # just use getattr to avoid attribute error.
+        if getattr(forward_context, "capturing", False):
             attn_output, num_tokens = self.full_graph_fia(
                 query, key, value, attn_metadata, output)
             output[:num_tokens] = attn_output[:num_tokens]

vllm_ascend/attention/mla_v1.py

@@ -5,6 +5,7 @@ from typing import (TYPE_CHECKING, ClassVar, NamedTuple, Optional, Tuple, Type,
 import numpy as np
 import torch
 import torch_npu
+import vllm.envs as envs_vllm
 from vllm.attention.backends.abstract import AttentionBackend, MLAAttentionImpl
 from vllm.attention.backends.utils import PAD_SLOT_ID
 from vllm.config import VllmConfig, get_current_vllm_config
@@ -53,7 +54,10 @@ class AscendMLABackend(AttentionBackend):
 
     @staticmethod
     def get_name() -> str:
-        return "ASCEND_MLA"
+        # HACK(Ronald1995): vllm `initialize_kv_cache` method in model runner v2 make
+        # attention name assertion, we just set name to FLASH_ATTN to avoid assertion error.
+        # rectify this when vllm disable the assertion.
+        return "ASCEND_MLA" if not envs_vllm.VLLM_USE_V2_MODEL_RUNNER else "FLASH_ATTN"
 
     @staticmethod
     def get_builder_cls():

vllm_ascend/attention/sfa_v1.py

@@ -3,6 +3,7 @@ from typing import TYPE_CHECKING, ClassVar, Optional, Tuple, Type, TypeVar
 
 import torch
 import torch_npu
+import vllm.envs as envs_vllm
 from torch import nn
 from vllm.attention.backends.abstract import AttentionBackend, MLAAttentionImpl
 from vllm.config import CUDAGraphMode, VllmConfig, get_current_vllm_config
@@ -44,7 +45,10 @@ class AscendSFABackend(AttentionBackend):
 
     @staticmethod
     def get_name() -> str:
-        return "ASCEND_SFA"
+        # HACK(Ronald1995): vllm `initialize_kv_cache` method in model runner v2 make
+        # attention name assertion, we just set name to FLASH_ATTN to avoid assertion error.
+        # rectify this when vllm disable the assertion.
+        return "ASCEND_SFA" if not envs_vllm.VLLM_USE_V2_MODEL_RUNNER else "FLASH_ATTN"
 
     @staticmethod
     def get_builder_cls():

vllm_ascend/ops/register_custom_ops.py

@@ -81,7 +81,7 @@ def _maybe_pad_and_reduce_impl(x: torch.Tensor,
     except AssertionError:
         return tensor_model_parallel_all_reduce(x)
 
-    if not forward_context.sp_enabled:
+    if not getattr(forward_context, "sp_enabled", False):
         return tensor_model_parallel_all_reduce(x)
 
     dp_metadata = forward_context.dp_metadata

vllm_ascend/worker/v2/README.md

@@ -0,0 +1,6 @@
+# [Experimental] Model Runner V2
+
+This directory contains the new model runner which is under active development.
+
+please see [Model Runner V2](https://github.com/vllm-project/vllm-ascend/issues/5208)
+to get specific plans.

vllm_ascend/worker/v2/aclgraph_utils.py

@@ -1,5 +1,21 @@
+# Adapt from https://github.com/vllm-project/vllm/blob/main/vllm/v1/worker/gpu/aclgraph_utils.py
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
 from contextlib import contextmanager
 from typing import Any
 

vllm_ascend/worker/v2/attn_utils.py

@@ -1,5 +1,22 @@
+# Adapt from https://github.com/vllm-project/vllm/blob/main/vllm/v1/worker/gpu/attn_utils.py
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
+
 from collections.abc import Sequence
 from typing import Any
 

vllm_ascend/worker/v2/input_batch.py

@@ -1,3 +1,22 @@
+# Adapt from https://github.com/vllm-project/vllm/blob/main/vllm/v1/worker/gpu/input_batch.py
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
+
 import numpy as np
 import torch
 from vllm.v1.worker.gpu.input_batch import InputBuffers

vllm_ascend/worker/v2/model_runner.py

@@ -1,5 +1,21 @@
+# Adapt from https://github.com/vllm-project/vllm/blob/main/vllm/v1/worker/gpu/model_runner.py
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
 
 import numpy as np
 import torch
@@ -19,7 +35,8 @@ from vllm_ascend.worker.v2.attn_utils import (build_attn_metadata,
                                               build_attn_state,
                                               make_attention_mask)
 from vllm_ascend.worker.v2.input_batch import AscendInputBuffers
-from vllm_ascend.worker.v2.states import AscendRequestState
+from vllm_ascend.worker.v2.sample.sampler import AscendSampler
+from vllm_ascend.worker.v2.states import AscendRequestState, uva_wrapper
 from vllm_ascend.worker.v2.utils import torch_cuda_wrapper
 
 logger = init_logger(__name__)
@@ -29,7 +46,7 @@ class NPUModelRunner(GPUModelRunner):
     """Model runner for Ascend NPUs."""
 
     def __init__(self, vllm_config: VllmConfig, device: torch.device):
-        with torch_cuda_wrapper():
+        with (torch_cuda_wrapper(), uva_wrapper()):
             super().__init__(vllm_config, device)
 
         # because we will override these attribute, delete these attribute to
@@ -37,6 +54,7 @@ class NPUModelRunner(GPUModelRunner):
         del self.cudagraph_manager
         del self.req_states
         del self.input_buffers
+        del self.sampler
 
         # NPU specific initializations can be added below.
         self.cudagraph_manager: AclGraphManager = AclGraphManager(
@@ -65,6 +83,10 @@ class NPUModelRunner(GPUModelRunner):
             device=self.device,
             pin_memory=self.pin_memory,
         )
+        # we need to adjust triton operators in sampler,
+        # so reinitialize sampler here.
+        self.sampler: AscendSampler = AscendSampler(
+            logprobs_mode=self.model_config.logprobs_mode, )
 
         # actual seq lengths for query (used in attention backends).
         self.actual_seq_lengths_q: list[int] = []
@@ -206,7 +228,9 @@ class NPUModelRunner(GPUModelRunner):
             self.req_states.next_prefill_tokens,
             idx_mapping_npu,
             query_start_loc_gpu,
-            self.req_states.prefill_token_ids.gpu,
+            # use prefill_token_ids.copy_to_gpu() because npu doesn't
+            # support uva buffer.
+            self.req_states.prefill_token_ids.copy_to_gpu(),
             self.req_states.prefill_len.gpu,
             self.req_states.num_computed_tokens,
         )
@@ -255,7 +279,9 @@ class NPUModelRunner(GPUModelRunner):
             num_computed_tokens_cpu=self.req_states.
             num_computed_tokens_cpu[idx_mapping_cpu],
             block_tables=block_tables,
-            slot_mappings=slot_mappings,
+            # torch_npu._reshape_and_cache operator requires slot_mappings to
+            # be torch.int32.
+            slot_mappings=slot_mappings.to(torch.int32),
             kv_cache_config=self.kv_cache_config,
             decode_token_per_req=self.decode_token_per_req,
             attn_mask=attn_mask,
@@ -344,3 +370,8 @@ class NPUModelRunner(GPUModelRunner):
                 req_index]
             self.input_buffers.seq_lens_cpu[
                 i] = num_computed_tokens + num_scheduled_tokens[req_id]
+
+    def eplb_warmup(self):
+        # TODO(Ronald1995): just define the method in case calling error in
+        # worker, implement it in the future.
+        pass

vllm_ascend/worker/v2/sample/gumbel.py

@@ -0,0 +1,128 @@
+# Adapt from https://github.com/vllm-project/vllm/blob/main/vllm/v1/worker/gpu/sample/gumbel.py.
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+#
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
+
+import torch
+from vllm.triton_utils import tl, triton
+
+
+@triton.jit
+def _gumbel_sample_kernel(
+    local_argmax_ptr,
+    local_argmax_stride,
+    local_max_ptr,
+    local_max_stride,
+    logits_ptr,
+    logits_stride,
+    seeds_ptr,
+    pos_ptr,
+    temp_ptr,
+    vocab_size,
+    BLOCK_SIZE: tl.constexpr,
+    APPLY_TEMPERATURE: tl.constexpr,
+):
+    req_idx = tl.program_id(0)
+    block_idx = tl.program_id(1)
+    block = block_idx * BLOCK_SIZE + tl.arange(0, BLOCK_SIZE)
+    mask = block < vocab_size
+    logits = tl.load(
+        logits_ptr + req_idx * logits_stride + block,
+        mask=mask,
+        other=float("-inf"),
+    )
+    logits = logits.to(tl.float32)
+
+    temp = tl.load(temp_ptr + req_idx).to(tl.float32)
+    if temp != 0.0:
+        # Calculate the seed for gumbel noise.
+        seed = tl.load(seeds_ptr + req_idx)
+        # NOTE(Ronald1995): change pos's dtype to tl.int32, because triton-ascend's
+        # compiler doesn't support unint64 of pos arg.
+        pos = tl.load(pos_ptr + req_idx).to(tl.int32)
+        gumbel_seed = tl.randint(seed, pos)
+
+        # Generate gumbel noise.
+        # NOTE(Ronald1995): r is tl.float64 in vllm, change it to tl.float32,
+        # or triton-ascend's compiler will raise error.
+        r = tl.rand(gumbel_seed, block).to(tl.float32)
+        gumbel_noise = -tl.log(-tl.log(r + 1e-20) + 1e-20)
+        gumbel_noise = gumbel_noise.to(tl.float32)
+
+        # Apply temperature.
+        if APPLY_TEMPERATURE:
+            # NOTE(woosuk): Match the behavior of _penalties_and_temperature_kernel.
+            # E.g., if the kernel uses tl.div_rn, we should use tl.div_rn here too.
+            logits = logits / temp
+
+        # Apply gumbel noise.
+        logits = tl.where(mask, logits + gumbel_noise, float("-inf"))
+
+    idx = tl.argmax(logits, axis=0)
+    token_id = block_idx * BLOCK_SIZE + idx
+    value = tl.max(logits, axis=0)
+    tl.store(local_argmax_ptr + req_idx * local_argmax_stride + block_idx,
+             token_id)
+    tl.store(local_max_ptr + req_idx * local_max_stride + block_idx, value)
+
+
+def gumbel_sample(
+    logits: torch.Tensor,  # [num_reqs, vocab_size]
+    temperature: torch.Tensor,  # [num_reqs]
+    seed: torch.Tensor,  # [num_reqs]
+    pos: torch.Tensor,  # [num_reqs]
+    apply_temperature: bool,
+) -> torch.Tensor:
+    """Override the function because there are some bugs
+    when _gumbel_sample_kernel runs on npu, we need to make some fixes.
+    you could read NOTE(Ronald1995) comments to understand.
+    """
+    num_reqs, vocab_size = logits.shape
+    BLOCK_SIZE = 1024
+    num_blocks = triton.cdiv(vocab_size, BLOCK_SIZE)
+    local_argmax = torch.empty(
+        num_reqs,
+        num_blocks,
+        dtype=torch.int64,
+        device=logits.device,
+    )
+    local_max = torch.empty(
+        num_reqs,
+        num_blocks,
+        dtype=torch.float32,
+        device=logits.device,
+    )
+    # TODO(Ronald1995): Optimize the performance of the kernel in npu.
+    _gumbel_sample_kernel[(num_reqs, num_blocks)](
+        local_argmax,
+        local_argmax.stride(0),
+        local_max,
+        local_max.stride(0),
+        logits,
+        logits.stride(0),
+        seed,
+        pos,
+        temperature,
+        vocab_size,
+        BLOCK_SIZE=BLOCK_SIZE,
+        APPLY_TEMPERATURE=apply_temperature,
+    )
+    # NOTE(woosuk): Use int64 for later indexing.
+    max_block_idx = local_max.argmax(dim=-1, keepdim=True)
+    sampled = local_argmax.gather(dim=-1, index=max_block_idx).view(-1)
+    return sampled

vllm_ascend/worker/v2/sample/penalties.py

@@ -0,0 +1,137 @@
+# Adapt from https://github.com/vllm-project/vllm/blob/main/vllm/v1/worker/gpu/sample/penalties.py.
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+#
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
+
+import torch
+from vllm.triton_utils import tl, triton
+from vllm.v1.worker.gpu.sample.metadata import SamplingMetadata
+
+
+@triton.jit
+def _penalties_and_temperature_kernel(
+    logits_ptr,
+    logits_stride,
+    repetition_penalty_ptr,
+    frequency_penalty_ptr,
+    presence_penalty_ptr,
+    temperature_ptr,
+    idx_mapping_ptr,
+    prompt_bin_mask_ptr,
+    prompt_bin_mask_stride,
+    output_bin_counts_ptr,
+    output_bin_counts_stride,
+    vocab_size,
+    BLOCK_SIZE: tl.constexpr,
+):
+    batch_idx = tl.program_id(0)
+    rep_penalty = tl.load(repetition_penalty_ptr + batch_idx)
+    freq_penalty = tl.load(frequency_penalty_ptr + batch_idx)
+    pres_penalty = tl.load(presence_penalty_ptr + batch_idx)
+    temperature = tl.load(temperature_ptr + batch_idx)
+    temperature = tl.where(temperature == 0.0, 1.0, temperature)
+
+    use_rep_penalty = rep_penalty != 1.0
+    use_freq_penalty = freq_penalty != 0.0
+    use_pres_penalty = pres_penalty != 0.0
+    # NOTE(Ronald1995): vllm original grammar `use_rep_penalty or
+    # use_freq_penalty or use_pres_penalty`,
+    # change it to `(use_rep_penalty or use_freq_penalty) or use_pres_penalty`,
+    # because triton-ascend's compiler doesn't support chained boolean operator.
+    use_penalty = (use_rep_penalty or use_freq_penalty) or use_pres_penalty
+    use_temperature = temperature != 1.0
+    if not (use_penalty or use_temperature):
+        # Early return to avoid loading logits.
+        return
+
+    block_idx = tl.program_id(1)
+    block = block_idx * BLOCK_SIZE + tl.arange(0, BLOCK_SIZE)
+    mask = block < vocab_size
+    logits = tl.load(logits_ptr + batch_idx * logits_stride + block, mask=mask)
+    logits = logits.to(tl.float32)
+
+    if use_penalty:
+        req_state_idx = tl.load(idx_mapping_ptr + batch_idx)
+        output_bin_counts = tl.load(
+            output_bin_counts_ptr + req_state_idx * output_bin_counts_stride +
+            block,
+            mask=mask,
+        )
+        output_bin_mask = output_bin_counts > 0
+
+        # Apply repetition penalties.
+        if use_rep_penalty:
+            packed_block = block_idx * BLOCK_SIZE // 32 + tl.arange(
+                0, BLOCK_SIZE // 32)
+            packed_mask = tl.load(
+                prompt_bin_mask_ptr + req_state_idx * prompt_bin_mask_stride +
+                packed_block,
+                mask=packed_block < tl.cdiv(vocab_size, 32),
+            )
+            prompt_bin_mask = (packed_mask[:, None] >>
+                               (tl.arange(0, 32)[None, :])) & 1
+            prompt_bin_mask = prompt_bin_mask.to(tl.int1)
+            prompt_bin_mask = prompt_bin_mask.reshape(BLOCK_SIZE)
+
+            # If token appears in prompt or output, apply, otherwise use 1.0 for no-op.
+            scale = tl.where(prompt_bin_mask | output_bin_mask, rep_penalty,
+                             1.0)
+            # If logits are positive, divide by penalty, otherwise multiply by penalty.
+            logits *= tl.where(logits > 0, 1.0 / scale, scale)
+
+        # Apply frequency penalties.
+        logits -= freq_penalty * output_bin_counts
+        # Apply presence penalties.
+        logits -= pres_penalty * output_bin_mask
+
+    # Apply temperature.
+    logits = logits / temperature
+
+    # Store back to logits.
+    tl.store(logits_ptr + batch_idx * logits_stride + block, logits, mask=mask)
+
+
+def apply_penalties_and_temperature(
+    logits: torch.Tensor,
+    sampling_metadata: SamplingMetadata,
+) -> None:
+    """Override the function because there are some bugs
+    when _penalties_and_temperature_kernel runs on npu, we need to make some fixes.
+    you could read NOTE(Ronald1995) comments to understand.
+    """
+    num_reqs, vocab_size = logits.shape
+    # NOTE(Ronald1995): change BLOCK_SIZE from 8192 to 4096 in case UB overflow
+    # in triton-ascend.
+    BLOCK_SIZE = 4096
+    num_blocks = triton.cdiv(vocab_size, BLOCK_SIZE)
+    # TODO(Ronald1995): Optimize the performance of the kernel in npu.
+    _penalties_and_temperature_kernel[(num_reqs, num_blocks)](
+        logits,
+        logits.stride(0),
+        sampling_metadata.repetition_penalty,
+        sampling_metadata.frequency_penalty,
+        sampling_metadata.presence_penalty,
+        sampling_metadata.temperature,
+        sampling_metadata.idx_mapping,
+        sampling_metadata.prompt_bin_mask,
+        sampling_metadata.prompt_bin_mask.stride(0),
+        sampling_metadata.output_bin_counts,
+        sampling_metadata.output_bin_counts.stride(0),
+        vocab_size,
+        BLOCK_SIZE=BLOCK_SIZE,
+    )

vllm_ascend/worker/v2/sample/sampler.py

@@ -0,0 +1,58 @@
+# Adapt from https://github.com/vllm-project/vllm/blob/main/vllm/v1/worker/gpu/sample/sampler.py.
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
+
+import torch
+from vllm.v1.sample.ops.topk_topp_sampler import apply_top_k_top_p
+from vllm.v1.worker.gpu.sample.metadata import SamplingMetadata
+from vllm.v1.worker.gpu.sample.min_p import apply_min_p
+from vllm.v1.worker.gpu.sample.sampler import Sampler
+
+from vllm_ascend.worker.v2.sample.gumbel import gumbel_sample
+from vllm_ascend.worker.v2.sample.penalties import \
+    apply_penalties_and_temperature
+
+
+class AscendSampler(Sampler):
+
+    def sample(
+        self,
+        logits: torch.Tensor,
+        sampling_metadata: SamplingMetadata,
+    ) -> tuple[torch.Tensor, torch.Tensor]:
+        """Override sample method because we need to override triton operators
+        called in the method.
+        """
+        # Copy logits to a new FP32 tensor.
+        logits = torch.empty_like(logits, dtype=torch.float32).copy_(logits)
+
+        # Apply penalties and temperature in place.
+        apply_penalties_and_temperature(logits, sampling_metadata)
+        # Apply min_p in place.
+        if sampling_metadata.min_p is not None:
+            apply_min_p(logits, sampling_metadata.min_p)
+        # Apply top_k and/or top_p. This might return a new tensor.
+        logits = apply_top_k_top_p(logits, sampling_metadata.top_k,
+                                   sampling_metadata.top_p)
+
+        sampled = gumbel_sample(
+            logits,
+            sampling_metadata.temperature,
+            sampling_metadata.seeds,
+            sampling_metadata.pos,
+            apply_temperature=False,
+        )
+        return sampled, logits

vllm_ascend/worker/v2/states.py

@@ -1,8 +1,28 @@
+# Adapt from https://github.com/vllm-project/vllm/blob/main/vllm/v1/worker/gpu/states.py
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
+
 from contextlib import contextmanager
 
 import torch
+import vllm
 from vllm.v1.utils import CpuGpuBuffer
-from vllm.v1.worker.gpu.states import RequestState, UvaBuffer
+from vllm.v1.worker.gpu.states import RequestState
 
 
 class AscendRequestState(RequestState):
@@ -18,16 +38,15 @@ class AscendRequestState(RequestState):
         device: torch.device,
         pin_memory: bool,
     ):
-        with uva_wrapper():
+        super().__init__(
-            super().__init__(
+            max_num_reqs,
-                max_num_reqs,
+            max_model_len,
-                max_model_len,
+            max_num_batched_tokens,
-                max_num_batched_tokens,
+            num_speculative_steps,
-                num_speculative_steps,
+            vocab_size,
-                vocab_size,
+            device,
-                device,
+            pin_memory,
-                pin_memory,
+        )
-            )
         # because we will override these attribute, delete these attribute to
         # make sure it's collected by python gc immediately.
         del self.prefill_token_ids
@@ -78,11 +97,9 @@ def uva_wrapper():
         def __init__(self, *args, **kwargs):
             pass
 
-    # TODO(Ronald1995): rectify this when NPU support uva.
-    global UvaBuffer
-    ori_class = UvaBuffer
     try:
-        UvaBuffer = UvaBufferWrapper
+        # TODO(Ronald1995): rectify this when NPU support uva.
+        vllm.v1.worker.gpu.states.UvaBuffer = UvaBufferWrapper
         yield
     finally:
-        UvaBuffer = ori_class
+        pass

vllm_ascend/worker/v2/utils.py

@@ -5,29 +5,16 @@ import torch
 
 @contextmanager
 def torch_cuda_wrapper():
-    ori_event = torch.cuda.Event
-    ori_stream = torch.cuda.Stream
-    ori_default_stream = torch.cuda.default_stream
-    ori_current_stream = torch.cuda.current_stream
-    ori_graph_pool_handle = torch.cuda.graph_pool_handle
-    ori_cuda_graph_cls = torch.cuda.CUDAGraph
-    ori_cuda_graph_func = torch.cuda.graph
     try:
         torch.cuda.Event = torch.npu.Event
         torch.cuda.Stream = torch.npu.Stream
+        torch.cuda.stream = torch.npu.stream
         torch.cuda.default_stream = torch.npu.default_stream
         torch.cuda.current_stream = torch.npu.current_stream
         torch.cuda.graph_pool_handle = torch.npu.graph_pool_handle
-        torch.cuda.CUDAGraph = torch.npu.NpuGraph
+        torch.cuda.CUDAGraph = torch.npu.NPUGraph
         torch.cuda.graph = torch.npu.graph
+        torch.cuda.synchronize = torch.npu.synchronize
         yield
     finally:
-        # revert back torch cuda properties, so it will still raise error
+        pass
-        # to call cuda ops in npu environment.
-        torch.cuda.Event = ori_event
-        torch.cuda.Stream = ori_stream
-        torch.cuda.default_stream = ori_default_stream
-        torch.cuda.current_stream = ori_current_stream
-        torch.cuda.graph_pool_handle = ori_graph_pool_handle
-        torch.cuda.CUDAGraph = ori_cuda_graph_cls
-        torch.cuda.graph = ori_cuda_graph_func

vllm_ascend/worker/worker.py

@@ -233,8 +233,8 @@ class NPUWorker(WorkerBase):
         self.device = self._init_device()
         # Init ModelRunner here, so that we have access to self.device.
         if self.use_v2_model_runner:
-            logger.error(
+            logger.warning(
-                "npu model runner v2 is in developing, it can't work well for now."
+                "npu model runner v2 is in developing, some features doesn't work for now."
             )
             from vllm_ascend.worker.v2.model_runner import \
                 NPUModelRunner as NPUModelRunnerV2