---
id: pr-flash-attention-2363
repo: Dao-AILab/flash-attention
pr: 2363
title: '[AMD ROCm] Update ROCm/CK backend to align with latest ComposableKernel API changes'
author: rocking5566
date: '2026-03-18'
url: https://github.com/Dao-AILab/flash-attention/pull/2363
source_category: upstream-code
architectures:
- sm100
tags:
- attention kernel
- fmha
- fp8
techniques: []
hardware_features:
- fp8
kernel_types:
- attention
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 8afc617aa7ebb72f70f659b03b9908c30920ad37
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- csrc/composable_kernel
- csrc/flash_attn_ck/mha_bwd.cpp
- csrc/flash_attn_ck/mha_fwd.cpp
- csrc/flash_attn_ck/mha_fwd_kvcache.cpp
- csrc/flash_attn_ck/mha_varlen_bwd.cpp
- csrc/flash_attn_ck/mha_varlen_fwd.cpp
- setup.py
artifact_dir: evidence/pull-bundles/flash-attention/gh-2363
head_ref_oid: febaff9c8ed79e39412f412c3081df24e82f88db
---
# [AMD ROCm] Update ROCm/CK backend to align with latest ComposableKernel API changes

- Repository: `Dao-AILab/flash-attention`
- PR: [2363](https://github.com/Dao-AILab/flash-attention/pull/2363)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `csrc/composable_kernel`
- `csrc/flash_attn_ck/mha_bwd.cpp`
- `csrc/flash_attn_ck/mha_fwd.cpp`
- `csrc/flash_attn_ck/mha_fwd_kvcache.cpp`
- `csrc/flash_attn_ck/mha_varlen_bwd.cpp`
- `csrc/flash_attn_ck/mha_varlen_fwd.cpp`
- `setup.py`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-2363`
