---
id: pr-vllm-20769
repo: vllm-project/vllm
pr: 20769
title: SM100 Cutlass MLA decode with unrestricted num_heads (< 128) for DeepSeek TP
author: alexm-redhat
date: '2025-07-15'
url: https://github.com/vllm-project/vllm/pull/20769
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- decode
- flash-attention
- mla
- tile-scheduling
- tma
techniques:
- tile-scheduling
hardware_features:
- tma
kernel_types:
- attention
- decode
- flash-attention
- mla
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 8cdc371217221bbddfe67a99a21a903609722a10
inclusion_reason: kernel file changes
changed_paths:
- CMakeLists.txt
- csrc/attention/mla/cutlass_sm100_mla/device/sm100_mla.hpp
- csrc/attention/mla/cutlass_sm100_mla/kernel/sm100_fmha_mla_reduction.hpp
- csrc/attention/mla/cutlass_sm100_mla/kernel/sm100_fmha_mla_tma_warpspecialized.hpp
- csrc/attention/mla/cutlass_sm100_mla/kernel/sm100_mla_tile_scheduler.hpp
- csrc/attention/mla/sm100_cutlass_mla_kernel.cu
- csrc/ops.h
- csrc/torch_bindings.cpp
- vllm/_custom_ops.py
- vllm/platforms/cuda.py
- vllm/v1/attention/backends/mla/common.py
- vllm/v1/attention/backends/mla/cutlass_mla.py
head_ref_oid: 3ad13158453276e20d053331866b69266dd1dd66
artifact_dir: evidence/pull-bundles/vllm/gh-20769
---
# SM100 Cutlass MLA decode with unrestricted num_heads (< 128) for DeepSeek TP

- Repository: `vllm-project/vllm`
- PR: [20769](https://github.com/vllm-project/vllm/pull/20769)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `CMakeLists.txt`
- `csrc/attention/mla/cutlass_sm100_mla/device/sm100_mla.hpp`
- `csrc/attention/mla/cutlass_sm100_mla/kernel/sm100_fmha_mla_reduction.hpp`
- `csrc/attention/mla/cutlass_sm100_mla/kernel/sm100_fmha_mla_tma_warpspecialized.hpp`
- `csrc/attention/mla/cutlass_sm100_mla/kernel/sm100_mla_tile_scheduler.hpp`
- `csrc/attention/mla/sm100_cutlass_mla_kernel.cu`
- `csrc/ops.h`
- `csrc/torch_bindings.cpp`
- `vllm/_custom_ops.py`
- `vllm/platforms/cuda.py`
- `vllm/v1/attention/backends/mla/common.py`
- `vllm/v1/attention/backends/mla/cutlass_mla.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-20769`
