[blackwell][draft] sm100: QKV projection + RoPE Triton kernel (#228) - #236
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[blackwell][draft] sm100: QKV projection + RoPE Triton kernel (#228)#236Andrewxu313 wants to merge 2 commits into
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Placeholder commit for draft PR. Implementation tracked in: batchgen-agent-metadata/batchgen_design/blackwell/blackwell-kernel-port-v1.md Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Fills the SM100 placeholder for the fused QKV WGMMA kernel. On Blackwell the WGMMA .cu is not built, so cuda_qkv_wgmma() dispatches to a pure-Triton GEMM+split kernel with a standard rotate_half RoPE epilogue matching the SM90a CUDA convention (out[n1]=x1*c-x2*s, out[n2]=x2*c+x1*s). - batchgen_kernels/triton/qkv_proj_rope.py: qkv_proj_split, apply_rope_qk, qkv_proj_rope - qkv_wgmma.py: sm100 dispatch branch + availability via Triton - triton/__init__.py: export new kernels Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Closes #228. Part of #204 (Blackwell Phase 2).
Summary
New triton/qkv_proj_rope.py: tl.dot BF16 matmul + fused split epilogue (Q/K/V separate buffers) + optional RoPE on Q+K. F.linear not acceptable (loses split+RoPE epilogue).
Spec
blackwell-kernel-port-v1.md § Sub-task 5