| //===- cuda-runtime-wrappers.cpp - MLIR CUDA runner wrapper library -------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Implements C wrappers around the CUDA library for easy linking in ORC jit. |
| // Also adds some debugging helpers that are helpful when writing MLIR code to |
| // run on GPUs. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include <cassert> |
| #include <numeric> |
| |
| #include "mlir/ExecutionEngine/CRunnerUtils.h" |
| #include "llvm/ADT/ArrayRef.h" |
| #include "llvm/Support/raw_ostream.h" |
| |
| #include "cuda.h" |
| |
| namespace { |
| int32_t reportErrorIfAny(CUresult result, const char *where) { |
| if (result != CUDA_SUCCESS) { |
| llvm::errs() << "CUDA failed with " << result << " in " << where << "\n"; |
| } |
| return result; |
| } |
| } // anonymous namespace |
| |
| extern "C" int32_t mgpuModuleLoad(void **module, void *data) { |
| int32_t err = reportErrorIfAny( |
| cuModuleLoadData(reinterpret_cast<CUmodule *>(module), data), |
| "ModuleLoad"); |
| return err; |
| } |
| |
| extern "C" int32_t mgpuModuleGetFunction(void **function, void *module, |
| const char *name) { |
| return reportErrorIfAny( |
| cuModuleGetFunction(reinterpret_cast<CUfunction *>(function), |
| reinterpret_cast<CUmodule>(module), name), |
| "GetFunction"); |
| } |
| |
| // The wrapper uses 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. |
| extern "C" int32_t mgpuLaunchKernel(void *function, intptr_t gridX, |
| intptr_t gridY, intptr_t gridZ, |
| intptr_t blockX, intptr_t blockY, |
| intptr_t blockZ, int32_t smem, void *stream, |
| void **params, void **extra) { |
| return reportErrorIfAny( |
| cuLaunchKernel(reinterpret_cast<CUfunction>(function), gridX, gridY, |
| gridZ, blockX, blockY, blockZ, smem, |
| reinterpret_cast<CUstream>(stream), params, extra), |
| "LaunchKernel"); |
| } |
| |
| extern "C" void *mgpuGetStreamHelper() { |
| CUstream stream; |
| reportErrorIfAny(cuStreamCreate(&stream, CU_STREAM_DEFAULT), "StreamCreate"); |
| return stream; |
| } |
| |
| extern "C" int32_t mgpuStreamSynchronize(void *stream) { |
| return reportErrorIfAny( |
| cuStreamSynchronize(reinterpret_cast<CUstream>(stream)), "StreamSync"); |
| } |
| |
| /// Helper functions for writing mlir example code |
| |
| // Allows to register byte array with the CUDA runtime. Helpful until we have |
| // transfer functions implemented. |
| extern "C" void mgpuMemHostRegister(void *ptr, uint64_t sizeBytes) { |
| reportErrorIfAny(cuMemHostRegister(ptr, sizeBytes, /*flags=*/0), |
| "MemHostRegister"); |
| } |
| |
| // Allows to register a MemRef with the CUDA runtime. Initializes array with |
| // value. Helpful until we have transfer functions implemented. |
| template <typename T> |
| void mcuMemHostRegisterMemRef(const DynamicMemRefType<T> &mem_ref, T value) { |
| llvm::SmallVector<int64_t, 4> denseStrides(mem_ref.rank); |
| llvm::ArrayRef<int64_t> sizes(mem_ref.sizes, mem_ref.rank); |
| llvm::ArrayRef<int64_t> strides(mem_ref.strides, mem_ref.rank); |
| |
| std::partial_sum(sizes.rbegin(), sizes.rend(), denseStrides.rbegin(), |
| std::multiplies<int64_t>()); |
| auto count = denseStrides.front(); |
| |
| // Only densely packed tensors are currently supported. |
| std::rotate(denseStrides.begin(), denseStrides.begin() + 1, |
| denseStrides.end()); |
| denseStrides.back() = 1; |
| assert(strides == llvm::makeArrayRef(denseStrides)); |
| |
| auto *pointer = mem_ref.data + mem_ref.offset; |
| std::fill_n(pointer, count, value); |
| mgpuMemHostRegister(pointer, count * sizeof(T)); |
| } |
| |
| extern "C" void mcuMemHostRegisterFloat(int64_t rank, void *ptr) { |
| UnrankedMemRefType<float> mem_ref = {rank, ptr}; |
| mcuMemHostRegisterMemRef(DynamicMemRefType<float>(mem_ref), 1.23f); |
| } |
| |
| extern "C" void mcuMemHostRegisterInt32(int64_t rank, void *ptr) { |
| UnrankedMemRefType<int32_t> mem_ref = {rank, ptr}; |
| mcuMemHostRegisterMemRef(DynamicMemRefType<int32_t>(mem_ref), 123); |
| } |