---
id: pr-sglang-13263
repo: sgl-project/sglang
pr: 13263
title: 'diffusion: enable fa4 for blackwell'
author: yhyang201
date: '2025-11-16'
url: https://github.com/sgl-project/sglang/pull/13263
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- kernel-fusion
- pipeline-stages
techniques:
- kernel-fusion
- pipeline-stages
hardware_features: []
kernel_types:
- attention
languages:
- cuda-cpp
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 6afe3963997014f656e613602693769aece88b27
inclusion_reason: kernel file changes
changed_paths:
- python/sglang/multimodal_gen/configs/models/dits/base.py
- python/sglang/multimodal_gen/configs/models/encoders/base.py
- python/sglang/multimodal_gen/runtime/layers/attention/backends/flash_attn.py
- python/sglang/multimodal_gen/runtime/layers/attention/backends/flash_attn_2.py
- python/sglang/multimodal_gen/runtime/models/dits/causal_wanvideo.py
- python/sglang/multimodal_gen/runtime/models/dits/flux.py
- python/sglang/multimodal_gen/runtime/models/dits/hunyuanvideo.py
- python/sglang/multimodal_gen/runtime/models/dits/qwen_image.py
- python/sglang/multimodal_gen/runtime/models/dits/stepvideo.py
- python/sglang/multimodal_gen/runtime/models/encoders/qwen2_5vl.py
- python/sglang/multimodal_gen/runtime/pipelines/stages/denoising.py
- python/sglang/multimodal_gen/runtime/platforms/cuda.py
- python/sglang/multimodal_gen/runtime/platforms/interface.py
- python/sglang/multimodal_gen/runtime/platforms/rocm.py
- python/sglang/multimodal_gen/runtime/server_args.py
head_ref_oid: a96581f581e77b1cde1be9c7ba9c15bdd3b20970
artifact_dir: evidence/pull-bundles/sglang/gh-13263
---
# diffusion: enable fa4 for blackwell

- Repository: `sgl-project/sglang`
- PR: [13263](https://github.com/sgl-project/sglang/pull/13263)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `python/sglang/multimodal_gen/configs/models/dits/base.py`
- `python/sglang/multimodal_gen/configs/models/encoders/base.py`
- `python/sglang/multimodal_gen/runtime/layers/attention/backends/flash_attn.py`
- `python/sglang/multimodal_gen/runtime/layers/attention/backends/flash_attn_2.py`
- `python/sglang/multimodal_gen/runtime/models/dits/causal_wanvideo.py`
- `python/sglang/multimodal_gen/runtime/models/dits/flux.py`
- `python/sglang/multimodal_gen/runtime/models/dits/hunyuanvideo.py`
- `python/sglang/multimodal_gen/runtime/models/dits/qwen_image.py`
- `python/sglang/multimodal_gen/runtime/models/dits/stepvideo.py`
- `python/sglang/multimodal_gen/runtime/models/encoders/qwen2_5vl.py`
- `python/sglang/multimodal_gen/runtime/pipelines/stages/denoising.py`
- `python/sglang/multimodal_gen/runtime/platforms/cuda.py`
- `python/sglang/multimodal_gen/runtime/platforms/interface.py`
- `python/sglang/multimodal_gen/runtime/platforms/rocm.py`
- `python/sglang/multimodal_gen/runtime/server_args.py`

## Evidence Bundle

`evidence/pull-bundles/sglang/gh-13263`
