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[Attention] FA4 integration (#32974)

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Signed-off-by: Lucas Wilkinson <lwilkins@redhat.com>
Signed-off-by: Matthew Bonanni <mbonanni@redhat.com>
Signed-off-by: Lucas Wilkinson <LucasWilkinson@users.noreply.github.com>
Co-authored-by: Matthew Bonanni <mbonanni@redhat.com>
Co-authored-by: Tyler Michael Smith <tyler@neuralmagic.com>
This commit is contained in:
Lucas Wilkinson
2026-03-01 18:44:57 -05:00
committed by GitHub
parent 57a96e26c9
commit 8b5014d3dd
15 changed files with 818 additions and 55 deletions
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4
vllm/model_executor/layers/attention/mla_attention.py
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@@ -2014,7 +2014,9 @@ class MLACommonImpl(MLAAttentionImpl[M], Generic[M]):
# RoCM and the latter has an additional parameter to control
# FA2 vs FA3
self.flash_attn_varlen_func = flash_attn_varlen_func
self.vllm_flash_attn_version = get_flash_attn_version()
self.vllm_flash_attn_version = get_flash_attn_version(
head_size=self.qk_head_dim
)
if self.vllm_flash_attn_version is not None:
self.flash_attn_varlen_func = functools.partial(
flash_attn_varlen_func, fa_version=self.vllm_flash_attn_version