cdf447baa5
This patch adds new runtime entry points that perform the simple allocation/deallocation of module allocatable variable with cuda attributes. When the allocation is initiated on the host, the descriptor on the device is synchronized. Both descriptors point to the same data on the device. This is the first PR of a stack.
51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
//===-- runtime/CUDA/descriptor.cpp ---------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "flang/Runtime/CUDA/descriptor.h"
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#include "../terminator.h"
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#include "flang/Runtime/CUDA/allocator.h"
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#include "flang/Runtime/CUDA/common.h"
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#include "cuda_runtime.h"
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namespace Fortran::runtime::cuda {
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extern "C" {
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RT_EXT_API_GROUP_BEGIN
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Descriptor *RTDEF(CUFAllocDesciptor)(
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std::size_t sizeInBytes, const char *sourceFile, int sourceLine) {
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return reinterpret_cast<Descriptor *>(CUFAllocManaged(sizeInBytes));
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}
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void RTDEF(CUFFreeDesciptor)(
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Descriptor *desc, const char *sourceFile, int sourceLine) {
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CUFFreeManaged(reinterpret_cast<void *>(desc));
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}
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void *RTDEF(CUFGetDeviceAddress)(
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void *hostPtr, const char *sourceFile, int sourceLine) {
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Terminator terminator{sourceFile, sourceLine};
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void *p;
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CUDA_REPORT_IF_ERROR(cudaGetSymbolAddress((void **)&p, hostPtr));
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if (!p) {
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terminator.Crash("Could not retrieve symbol's address");
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}
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return p;
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}
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void RTDEF(CUFDescriptorSync)(Descriptor *dst, const Descriptor *src,
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const char *sourceFile, int sourceLine) {
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std::size_t count{src->SizeInBytes()};
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CUDA_REPORT_IF_ERROR(cudaMemcpy(
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(void *)dst, (const void *)src, count, cudaMemcpyHostToDevice));
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}
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RT_EXT_API_GROUP_END
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}
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} // namespace Fortran::runtime::cuda
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