Files
sglang/sgl-kernel/cmake/flashmla.cmake
2025-10-21 21:17:50 -07:00

61 lines
2.1 KiB
CMake

include(FetchContent)
# flash_mla
FetchContent_Declare(
repo-flashmla
GIT_REPOSITORY https://github.com/sgl-project/FlashMLA
GIT_TAG bc8576abc3e507425cf6498f3d3393df7733ce37
GIT_SHALLOW OFF
)
FetchContent_Populate(repo-flashmla)
set(FLASHMLA_CUDA_FLAGS
"--expt-relaxed-constexpr"
"--expt-extended-lambda"
"--use_fast_math"
)
# The FlashMLA kernels only work on hopper and require CUDA 12.4 or later.
# Only build FlashMLA kernels if we are building for something compatible with
# sm90a
if(${CUDA_VERSION} VERSION_GREATER 12.4)
list(APPEND FLASHMLA_CUDA_FLAGS
"-gencode=arch=compute_90a,code=sm_90a"
)
endif()
if(${CUDA_VERSION} VERSION_GREATER 12.8)
list(APPEND FLASHMLA_CUDA_FLAGS
"-gencode=arch=compute_100a,code=sm_100a"
)
endif()
set(FlashMLA_SOURCES
"csrc/flashmla_extension.cc"
${repo-flashmla_SOURCE_DIR}/csrc/python_api.cpp
${repo-flashmla_SOURCE_DIR}/csrc/smxx/get_mla_metadata.cu
${repo-flashmla_SOURCE_DIR}/csrc/smxx/mla_combine.cu
${repo-flashmla_SOURCE_DIR}/csrc/sm90/decode/dense/splitkv_mla.cu
${repo-flashmla_SOURCE_DIR}/csrc/sm90/decode/sparse_fp8/splitkv_mla.cu
${repo-flashmla_SOURCE_DIR}/csrc/sm90/prefill/sparse/fwd.cu
${repo-flashmla_SOURCE_DIR}/csrc/sm100/decode/sparse_fp8/splitkv_mla.cu
${repo-flashmla_SOURCE_DIR}/csrc/sm100/prefill/dense/fmha_cutlass_fwd_sm100.cu
${repo-flashmla_SOURCE_DIR}/csrc/sm100/prefill/dense/fmha_cutlass_bwd_sm100.cu
${repo-flashmla_SOURCE_DIR}/csrc/sm100/prefill/sparse/fwd.cu
)
Python_add_library(flashmla_ops MODULE USE_SABI ${SKBUILD_SABI_VERSION} WITH_SOABI ${FlashMLA_SOURCES})
target_compile_options(flashmla_ops PRIVATE $<$<COMPILE_LANGUAGE:CUDA>:${FLASHMLA_CUDA_FLAGS}>)
target_include_directories(flashmla_ops PRIVATE
${repo-flashmla_SOURCE_DIR}/csrc
${repo-flashmla_SOURCE_DIR}/csrc/sm90
${repo-flashmla_SOURCE_DIR}/csrc/cutlass/include
${repo-flashmla_SOURCE_DIR}/csrc/cutlass/tools/util/include
)
target_link_libraries(flashmla_ops PRIVATE ${TORCH_LIBRARIES} c10 cuda)
install(TARGETS flashmla_ops LIBRARY DESTINATION "sgl_kernel")
target_compile_definitions(flashmla_ops PRIVATE)