Files
xc-llm-ascend/csrc/dispatch_layout/op_kernel/dispatch_layout.cpp
shiro-zzzz 0617d7d394 [Kernel] add custom moe ops for prefill (#4194)
### What this PR does / why we need it?
1.Add the implementation of normal Aclnn operators: MoeCombineNormal,
MoeDispatchNormal, NotifyDispatch,and DispatchLayout.

- MoeCombineNormal: Implements the combine logic within MoE operations.
- MoeDispatchNormal: Implements the dispatch logic within MoE
operations.
- NotifyDispatch: Exchanges topk_idx information among different ranks
to calculate the device memory required for the dispatch stage.
- DispatchLayout: Used to calculate information related to the device
memory layout for the dispatch stage.

2.Provide PyTorch interfaces for normal operators—get_dispatch_layout,
dispatch_prefill, and combine_prefill—to be used for MoE communication
during the prefill stage in vLLM.

- get_dispatch_layout: Calculates information related to the device
memory layout for the dispatch operator, and is called before
dispatch_prefill.
- dispatch_prefill: Initiates the dispatch operation.
- combine_prefill: Initiates the combine operation.

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
The functionality has already been validated using the local Qwen model.
Test cases will be added after support for multi-NPU use cases in the CI
pipeline is finalized.


- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

Signed-off-by: shiro-zzzz <zhangdianhao@huawei.com>
2025-12-08 19:11:58 +08:00

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C++

#include "kernel_operator.h"
#include "dispatch_layout.h"
#include "dispatch_layout_tiling.h"
extern "C" __global__ __aicore__ void dispatch_layout(GM_ADDR topkIdx, GM_ADDR numTokensPerRank, GM_ADDR numTokensPerExpert,
GM_ADDR isTokenInRank, GM_ADDR workspace, GM_ADDR tiling)
{
REGISTER_TILING_DEFAULT(DispatchLayoutTilingData);
GET_TILING_DATA_WITH_STRUCT(DispatchLayoutTilingData, tilingData, tiling);
TPipe pipe;
DispatchLayout<int32_t> op;
op.Init(topkIdx, numTokensPerRank, numTokensPerExpert, isTokenInRank, workspace, &pipe, &tilingData);
op.Process();
}