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fix: [https://nvbugspro.nvidia.com/bug/5243482] If FlashMLA is used, the existence of FMHA based MLA kernels should not be checked. #3862

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@bobboli bobboli commented Apr 25, 2025

Description

Add mIsGenerationMLA to differentiate ctx and gen MLA in AttentionOp.
For Generation MLA, if FlashMLA is used, do not check the existence of FMHA based MLA kernel.

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For Generation MLA, if FlashMLA is used, do not check the existence of FMHA based MLA kernel.

Signed-off-by: Bo Li <[email protected]>
@bobboli bobboli requested a review from uchihatmtkinu April 25, 2025 08:01
@litaotju
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@bobboli does this fix affect Blackwell and Hopper? And does 0.19 has the issue? if so, pls also help fix it in the release/0.19. Thx

@juney-nvidia juney-nvidia changed the title [https://nvbugspro.nvidia.com/bug/5243482] fix: If FlashMLA is used, the existence of FMHA based MLA kernels should not be checked. fix: [https://nvbugspro.nvidia.com/bug/5243482] If FlashMLA is used, the existence of FMHA based MLA kernels should not be checked. Apr 26, 2025
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