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[flang][cuda] Add entry point to launch global function with cluster_dims #113958

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Merged
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Oct 29, 2024
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[flang][cuda] Add entry point to launch global function with cluster_dims #113958

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8 changes: 7 additions & 1 deletion flang/include/flang/Runtime/CUDA/kernel.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,13 +15,19 @@

extern "C" {

// This function uses intptr_t instead of CUDA's unsigned int to match
// These functions use intptr_t instead of CUDA's unsigned int to match
// the type of MLIR's index type. This avoids the need for casts in the
// generated MLIR code.

void RTDEF(CUFLaunchKernel)(const void *kernelName, intptr_t gridX,
intptr_t gridY, intptr_t gridZ, intptr_t blockX, intptr_t blockY,
intptr_t blockZ, int32_t smem, void **params, void **extra);

void RTDEF(CUFLaunchClusterKernel)(const void *kernelName, intptr_t clusterX,
intptr_t clusterY, intptr_t clusterZ, intptr_t gridX, intptr_t gridY,
intptr_t gridZ, intptr_t blockX, intptr_t blockY, intptr_t blockZ,
int32_t smem, void **params, void **extra);

} // extern "C"

#endif // FORTRAN_RUNTIME_CUDA_KERNEL_H_
25 changes: 24 additions & 1 deletion flang/runtime/CUDA/kernel.cpp
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Expand Up @@ -25,9 +25,32 @@ void RTDEF(CUFLaunchKernel)(const void *kernel, intptr_t gridX, intptr_t gridY,
blockDim.x = blockX;
blockDim.y = blockY;
blockDim.z = blockZ;
cudaStream_t stream = 0;
cudaStream_t stream = 0; // TODO stream managment
CUDA_REPORT_IF_ERROR(
cudaLaunchKernel(kernel, gridDim, blockDim, params, smem, stream));
}

void RTDEF(CUFLaunchClusterKernel)(const void *kernel, intptr_t clusterX,
intptr_t clusterY, intptr_t clusterZ, intptr_t gridX, intptr_t gridY,
intptr_t gridZ, intptr_t blockX, intptr_t blockY, intptr_t blockZ,
int32_t smem, void **params, void **extra) {
cudaLaunchConfig_t config;
config.gridDim.x = gridX;
config.gridDim.y = gridY;
config.gridDim.z = gridZ;
config.blockDim.x = blockX;
config.blockDim.y = blockY;
config.blockDim.z = blockZ;
config.dynamicSmemBytes = smem;
config.stream = 0; // TODO stream managment
cudaLaunchAttribute launchAttr[1];
launchAttr[0].id = cudaLaunchAttributeClusterDimension;
launchAttr[0].val.clusterDim.x = clusterX;
launchAttr[0].val.clusterDim.y = clusterY;
launchAttr[0].val.clusterDim.z = clusterZ;
config.numAttrs = 1;
config.attrs = launchAttr;
CUDA_REPORT_IF_ERROR(cudaLaunchKernelExC(&config, kernel, params));
}

} // extern "C"
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