104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
// Copyright (c) 2010-2022, Lawrence Livermore National Security, LLC. Produced
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// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
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// LICENSE and NOTICE for details. LLNL-CODE-806117.
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//
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// This file is part of the MFEM library. For more information and source code
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// availability visit https://mfem.org.
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//
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// MFEM is free software; you can redistribute it and/or modify it under the
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// terms of the BSD-3 license. We welcome feedback and contributions, see file
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// CONTRIBUTING.md for details.
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#ifndef MFEM_CUDA_HPP
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#define MFEM_CUDA_HPP
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#include "../config/config.hpp"
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#include "error.hpp"
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// CUDA block size used by MFEM.
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#define MFEM_CUDA_BLOCKS 256
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#ifdef MFEM_USE_CUDA
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#define MFEM_USE_CUDA_OR_HIP
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#define MFEM_DEVICE __device__
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#define MFEM_LAMBDA __host__
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#define MFEM_HOST_DEVICE __host__ __device__
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#define MFEM_DEVICE_SYNC MFEM_GPU_CHECK(cudaDeviceSynchronize())
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#define MFEM_STREAM_SYNC MFEM_GPU_CHECK(cudaStreamSynchronize(0))
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// Define a CUDA error check macro, MFEM_GPU_CHECK(x), where x returns/is of
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// type 'cudaError_t'. This macro evaluates 'x' and raises an error if the
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// result is not cudaSuccess.
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#define MFEM_GPU_CHECK(x) \
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do \
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{ \
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cudaError_t err = (x); \
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if (err != cudaSuccess) \
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{ \
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mfem_cuda_error(err, #x, _MFEM_FUNC_NAME, __FILE__, __LINE__); \
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} \
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} \
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while (0)
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#endif // MFEM_USE_CUDA
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// Define the MFEM inner threading macros
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#if defined(MFEM_USE_CUDA) && defined(__CUDA_ARCH__)
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#define MFEM_SHARED __shared__
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#define MFEM_SYNC_THREAD __syncthreads()
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#define MFEM_BLOCK_ID(k) blockIdx.k
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#define MFEM_THREAD_ID(k) threadIdx.k
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#define MFEM_THREAD_SIZE(k) blockDim.k
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#define MFEM_FOREACH_THREAD(i,k,N) for(int i=threadIdx.k; i<N; i+=blockDim.k)
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#endif
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namespace mfem
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{
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#ifdef MFEM_USE_CUDA
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// Function used by the macro MFEM_GPU_CHECK.
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void mfem_cuda_error(cudaError_t err, const char *expr, const char *func,
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const char *file, int line);
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#endif
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/// Allocates device memory and returns destination ptr.
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void* CuMemAlloc(void **d_ptr, size_t bytes);
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/// Allocates managed device memory
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void* CuMallocManaged(void **d_ptr, size_t bytes);
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/// Allocates page-locked (pinned) host memory
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void* CuMemAllocHostPinned(void **ptr, size_t bytes);
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/// Frees device memory and returns destination ptr.
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void* CuMemFree(void *d_ptr);
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/// Frees page-locked (pinned) host memory and returns destination ptr.
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void* CuMemFreeHostPinned(void *ptr);
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/// Copies memory from Host to Device and returns destination ptr.
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void* CuMemcpyHtoD(void *d_dst, const void *h_src, size_t bytes);
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/// Copies memory from Host to Device and returns destination ptr.
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void* CuMemcpyHtoDAsync(void *d_dst, const void *h_src, size_t bytes);
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/// Copies memory from Device to Device
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void* CuMemcpyDtoD(void *d_dst, const void *d_src, size_t bytes);
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/// Copies memory from Device to Device
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void* CuMemcpyDtoDAsync(void *d_dst, const void *d_src, size_t bytes);
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/// Copies memory from Device to Host
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void* CuMemcpyDtoH(void *h_dst, const void *d_src, size_t bytes);
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/// Copies memory from Device to Host
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void* CuMemcpyDtoHAsync(void *h_dst, const void *d_src, size_t bytes);
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/// Check the error code returned by cudaGetLastError(), aborting on error.
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void CuCheckLastError();
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/// Get the number of CUDA devices
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int CuGetDeviceCount();
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} // namespace mfem
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#endif // MFEM_CUDA_HPP
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