134401deea
Summary: Handling the RPC server requires running through list of jobs that the device has requested to be done. Currently this is handled by the thread that does the waiting for the kernel to finish. However, this is not sound on NVIDIA architectures and only works for async launches in the OpenMP model that uses helper threads. However, we also don't want to have this thread doing work unnnecessarily. For this reason we track the execution of kernels and cause the thread to sleep via a condition variable (usually backed by some kind of futex or other intelligent sleeping mechanism) so that the thread will be idle while no kernels are running.
172 lines
4.6 KiB
C++
172 lines
4.6 KiB
C++
//===--- cuda/dynamic_cuda/cuda.pp ------------------------------- C++ -*-===//
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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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//
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// Implement subset of cuda api by calling into cuda library via dlopen
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// Does the dlopen/dlsym calls as part of the call to cuInit
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/DynamicLibrary.h"
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#include "Shared/Debug.h"
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#include "DLWrap.h"
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#include "cuda.h"
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#include <memory>
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#include <string>
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#include <unordered_map>
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DLWRAP_INITIALIZE()
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DLWRAP_INTERNAL(cuInit, 1)
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DLWRAP(cuCtxGetDevice, 1)
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DLWRAP(cuDeviceGet, 2)
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DLWRAP(cuDeviceGetAttribute, 3)
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DLWRAP(cuDeviceGetCount, 1)
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DLWRAP(cuFuncGetAttribute, 3)
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// Device info
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DLWRAP(cuDeviceGetName, 3)
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DLWRAP(cuDeviceTotalMem, 2)
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DLWRAP(cuDriverGetVersion, 1)
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DLWRAP(cuGetErrorString, 2)
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DLWRAP(cuLaunchKernel, 11)
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DLWRAP(cuMemAlloc, 2)
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DLWRAP(cuMemAllocHost, 2)
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DLWRAP(cuMemAllocManaged, 3)
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DLWRAP(cuMemAllocAsync, 3)
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DLWRAP(cuMemcpyDtoDAsync, 4)
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DLWRAP(cuMemcpyDtoH, 3)
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DLWRAP(cuMemcpyDtoHAsync, 4)
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DLWRAP(cuMemcpyHtoD, 3)
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DLWRAP(cuMemcpyHtoDAsync, 4)
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DLWRAP(cuMemFree, 1)
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DLWRAP(cuMemFreeHost, 1)
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DLWRAP(cuMemFreeAsync, 2)
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DLWRAP(cuModuleGetFunction, 3)
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DLWRAP(cuModuleGetGlobal, 4)
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DLWRAP(cuModuleUnload, 1)
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DLWRAP(cuStreamCreate, 2)
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DLWRAP(cuStreamDestroy, 1)
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DLWRAP(cuStreamSynchronize, 1)
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DLWRAP(cuStreamQuery, 1)
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DLWRAP(cuStreamAddCallback, 4)
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DLWRAP(cuCtxSetCurrent, 1)
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DLWRAP(cuDevicePrimaryCtxRelease, 1)
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DLWRAP(cuDevicePrimaryCtxGetState, 3)
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DLWRAP(cuDevicePrimaryCtxSetFlags, 2)
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DLWRAP(cuDevicePrimaryCtxRetain, 2)
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DLWRAP(cuModuleLoadDataEx, 5)
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DLWRAP(cuDeviceCanAccessPeer, 3)
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DLWRAP(cuCtxEnablePeerAccess, 2)
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DLWRAP(cuMemcpyPeerAsync, 6)
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DLWRAP(cuCtxGetLimit, 2)
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DLWRAP(cuCtxSetLimit, 2)
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DLWRAP(cuEventCreate, 2)
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DLWRAP(cuEventRecord, 2)
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DLWRAP(cuStreamWaitEvent, 3)
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DLWRAP(cuEventSynchronize, 1)
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DLWRAP(cuEventDestroy, 1)
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DLWRAP_FINALIZE()
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DLWRAP(cuMemUnmap, 2)
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DLWRAP(cuMemRelease, 1)
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DLWRAP(cuMemAddressFree, 2)
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DLWRAP(cuMemGetInfo, 2)
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DLWRAP(cuMemAddressReserve, 5)
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DLWRAP(cuMemMap, 5)
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DLWRAP(cuMemCreate, 4)
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DLWRAP(cuMemSetAccess, 4)
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DLWRAP(cuMemGetAllocationGranularity, 3)
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#ifndef DYNAMIC_CUDA_PATH
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#define DYNAMIC_CUDA_PATH "libcuda.so"
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#endif
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#ifndef TARGET_NAME
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#define TARGET_NAME CUDA
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#endif
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#ifndef DEBUG_PREFIX
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#define DEBUG_PREFIX "Target " GETNAME(TARGET_NAME) " RTL"
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#endif
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static bool checkForCUDA() {
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// return true if dlopen succeeded and all functions found
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// Prefer _v2 versions of functions if found in the library
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std::unordered_map<std::string, const char *> TryFirst = {
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{"cuMemAlloc", "cuMemAlloc_v2"},
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{"cuMemFree", "cuMemFree_v2"},
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{"cuMemcpyDtoH", "cuMemcpyDtoH_v2"},
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{"cuMemcpyHtoD", "cuMemcpyHtoD_v2"},
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{"cuStreamDestroy", "cuStreamDestroy_v2"},
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{"cuModuleGetGlobal", "cuModuleGetGlobal_v2"},
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{"cuMemcpyDtoHAsync", "cuMemcpyDtoHAsync_v2"},
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{"cuMemcpyDtoDAsync", "cuMemcpyDtoDAsync_v2"},
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{"cuMemcpyHtoDAsync", "cuMemcpyHtoDAsync_v2"},
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{"cuDevicePrimaryCtxRelease", "cuDevicePrimaryCtxRelease_v2"},
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{"cuDevicePrimaryCtxSetFlags", "cuDevicePrimaryCtxSetFlags_v2"},
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};
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const char *CudaLib = DYNAMIC_CUDA_PATH;
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std::string ErrMsg;
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auto DynlibHandle = std::make_unique<llvm::sys::DynamicLibrary>(
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llvm::sys::DynamicLibrary::getPermanentLibrary(CudaLib, &ErrMsg));
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if (!DynlibHandle->isValid()) {
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DP("Unable to load library '%s': %s!\n", CudaLib, ErrMsg.c_str());
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return false;
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}
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for (size_t I = 0; I < dlwrap::size(); I++) {
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const char *Sym = dlwrap::symbol(I);
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auto It = TryFirst.find(Sym);
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if (It != TryFirst.end()) {
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const char *First = It->second;
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void *P = DynlibHandle->getAddressOfSymbol(First);
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if (P) {
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DP("Implementing %s with dlsym(%s) -> %p\n", Sym, First, P);
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*dlwrap::pointer(I) = P;
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continue;
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}
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}
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void *P = DynlibHandle->getAddressOfSymbol(Sym);
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if (P == nullptr) {
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DP("Unable to find '%s' in '%s'!\n", Sym, CudaLib);
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return false;
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}
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DP("Implementing %s with dlsym(%s) -> %p\n", Sym, Sym, P);
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*dlwrap::pointer(I) = P;
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}
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return true;
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}
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CUresult cuInit(unsigned X) {
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// Note: Called exactly once from cuda rtl.cpp in a global constructor so
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// does not need to handle being called repeatedly or concurrently
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if (!checkForCUDA()) {
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return CUDA_ERROR_INVALID_HANDLE;
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}
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return dlwrap_cuInit(X);
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}
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