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//===-- lib/cuda/memory.cpp -------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "flang/Runtime/CUDA/memory.h"
#include "flang-rt/runtime/assign-impl.h"
#include "flang-rt/runtime/descriptor.h"
#include "flang-rt/runtime/environment.h"
#include "flang-rt/runtime/terminator.h"
#include "flang/Runtime/CUDA/common.h"
#include "flang/Runtime/CUDA/descriptor.h"
#include "flang/Runtime/CUDA/memmove-function.h"
#include "flang/Runtime/assign.h"
#include "cuda_runtime.h"
namespace Fortran::runtime::cuda {
extern "C" {
void *RTDEF(CUFMemAlloc)(
std::size_t bytes, unsigned type, const char *sourceFile, int sourceLine) {
void *ptr = nullptr;
bytes = bytes ? bytes : 1;
if (type == kMemTypeDevice) {
if (Fortran::runtime::executionEnvironment.cudaDeviceIsManaged) {
CUDA_REPORT_IF_ERROR(
cudaMallocManaged((void **)&ptr, bytes, cudaMemAttachGlobal));
} else {
CUDA_REPORT_IF_ERROR(cudaMalloc((void **)&ptr, bytes));
}
} else if (type == kMemTypeManaged || type == kMemTypeUnified) {
CUDA_REPORT_IF_ERROR(
cudaMallocManaged((void **)&ptr, bytes, cudaMemAttachGlobal));
} else if (type == kMemTypePinned) {
CUDA_REPORT_IF_ERROR(cudaMallocHost((void **)&ptr, bytes));
} else {
Terminator terminator{sourceFile, sourceLine};
terminator.Crash("unsupported memory type");
}
return ptr;
}
void RTDEF(CUFMemFree)(
void *ptr, unsigned type, const char *sourceFile, int sourceLine) {
if (!ptr)
return;
if (type == kMemTypeDevice || type == kMemTypeManaged ||
type == kMemTypeUnified) {
CUDA_REPORT_IF_ERROR(cudaFree(ptr));
} else if (type == kMemTypePinned) {
CUDA_REPORT_IF_ERROR(cudaFreeHost(ptr));
} else {
Terminator terminator{sourceFile, sourceLine};
terminator.Crash("unsupported memory type");
}
}
void RTDEF(CUFMemsetDescriptor)(
Descriptor *desc, void *value, const char *sourceFile, int sourceLine) {
Terminator terminator{sourceFile, sourceLine};
terminator.Crash("not yet implemented: CUDA data transfer from a scalar "
"value to a descriptor");
}
void RTDEF(CUFDataTransferPtrPtr)(void *dst, void *src, std::size_t bytes,
unsigned mode, const char *sourceFile, int sourceLine) {
cudaMemcpyKind kind;
if (mode == kHostToDevice) {
kind = cudaMemcpyHostToDevice;
} else if (mode == kDeviceToHost) {
kind = cudaMemcpyDeviceToHost;
} else if (mode == kDeviceToDevice) {
kind = cudaMemcpyDeviceToDevice;
} else {
Terminator terminator{sourceFile, sourceLine};
terminator.Crash("host to host copy not supported");
}
// TODO: Use cudaMemcpyAsync when we have support for stream.
CUDA_REPORT_IF_ERROR(cudaMemcpy(dst, src, bytes, kind));
}
void RTDEF(CUFDataTransferPtrDesc)(void *addr, Descriptor *desc,
std::size_t bytes, unsigned mode, const char *sourceFile, int sourceLine) {
Terminator terminator{sourceFile, sourceLine};
terminator.Crash(
"not yet implemented: CUDA data transfer from a descriptor to a pointer");
}
void RTDECL(CUFDataTransferDescDesc)(Descriptor *dstDesc, Descriptor *srcDesc,
unsigned mode, const char *sourceFile, int sourceLine) {
MemmoveFct memmoveFct;
Terminator terminator{sourceFile, sourceLine};
if (mode == kHostToDevice) {
memmoveFct = &MemmoveHostToDevice;
} else if (mode == kDeviceToHost) {
memmoveFct = &MemmoveDeviceToHost;
} else if (mode == kDeviceToDevice) {
memmoveFct = &MemmoveDeviceToDevice;
} else {
terminator.Crash("host to host copy not supported");
}
// Allocate dst descriptor if not allocated.
if (!dstDesc->IsAllocated()) {
dstDesc->ApplyMold(*srcDesc, dstDesc->rank());
dstDesc->Allocate(/*asyncObject=*/nullptr);
}
if ((srcDesc->rank() > 0) && (dstDesc->Elements() <= srcDesc->Elements()) &&
srcDesc->IsContiguous() && dstDesc->IsContiguous()) {
// Special case when rhs is bigger than lhs and both are contiguous arrays.
// In this case we do a simple ptr to ptr transfer with the size of lhs.
// This is be allowed in the reference compiler and it avoids error
// triggered in the Assign runtime function used for the main case below.
RTNAME(CUFDataTransferPtrPtr)(dstDesc->raw().base_addr,
srcDesc->raw().base_addr, dstDesc->Elements() * dstDesc->ElementBytes(),
mode, sourceFile, sourceLine);
} else {
Fortran::runtime::Assign(
*dstDesc, *srcDesc, terminator, MaybeReallocate, memmoveFct);
}
}
void RTDECL(CUFDataTransferCstDesc)(Descriptor *dstDesc, Descriptor *srcDesc,
unsigned mode, const char *sourceFile, int sourceLine) {
MemmoveFct memmoveFct;
Terminator terminator{sourceFile, sourceLine};
if (mode == kHostToDevice) {
memmoveFct = &MemmoveHostToDevice;
} else if (mode == kDeviceToHost) {
memmoveFct = &MemmoveDeviceToHost;
} else if (mode == kDeviceToDevice) {
memmoveFct = &MemmoveDeviceToDevice;
} else {
terminator.Crash("host to host copy not supported");
}
Fortran::runtime::DoFromSourceAssign(
*dstDesc, *srcDesc, terminator, memmoveFct);
}
void RTDECL(CUFDataTransferDescDescNoRealloc)(Descriptor *dstDesc,
Descriptor *srcDesc, unsigned mode, const char *sourceFile,
int sourceLine) {
MemmoveFct memmoveFct;
Terminator terminator{sourceFile, sourceLine};
if (mode == kHostToDevice) {
memmoveFct = &MemmoveHostToDevice;
} else if (mode == kDeviceToHost) {
memmoveFct = &MemmoveDeviceToHost;
} else if (mode == kDeviceToDevice) {
memmoveFct = &MemmoveDeviceToDevice;
} else {
terminator.Crash("host to host copy not supported");
}
Fortran::runtime::Assign(
*dstDesc, *srcDesc, terminator, NoAssignFlags, memmoveFct);
}
void RTDECL(CUFDataTransferGlobalDescDesc)(Descriptor *dstDesc,
Descriptor *srcDesc, unsigned mode, const char *sourceFile,
int sourceLine) {
RTNAME(CUFDataTransferDescDesc)
(dstDesc, srcDesc, mode, sourceFile, sourceLine);
if ((mode == kHostToDevice) || (mode == kDeviceToDevice)) {
void *deviceAddr{
RTNAME(CUFGetDeviceAddress)((void *)dstDesc, sourceFile, sourceLine)};
RTNAME(CUFDescriptorSync)
((Descriptor *)deviceAddr, dstDesc, sourceFile, sourceLine);
}
}
}
} // namespace Fortran::runtime::cuda
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