1 //===--- cuda/dynamic_cuda/cuda.pp ------------------------------- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Implement subset of cuda api by calling into cuda library via dlopen
10 // Does the dlopen/dlsym calls as part of the call to cuInit
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "cuda.h"
15 #include "Debug.h"
16 #include "dlwrap.h"
17
18 #include <string>
19 #include <unordered_map>
20
21 #include <dlfcn.h>
22
23 DLWRAP_INITIALIZE();
24
25 DLWRAP_INTERNAL(cuInit, 1);
26
27 DLWRAP(cuCtxGetDevice, 1);
28 DLWRAP(cuDeviceGet, 2);
29 DLWRAP(cuDeviceGetAttribute, 3);
30 DLWRAP(cuDeviceGetCount, 1);
31 DLWRAP(cuFuncGetAttribute, 3);
32
33 // Device info
34 DLWRAP(cuDeviceGetName, 3);
35 DLWRAP(cuDeviceTotalMem, 2);
36 DLWRAP(cuDriverGetVersion, 1);
37
38 DLWRAP(cuGetErrorString, 2);
39 DLWRAP(cuLaunchKernel, 11);
40
41 DLWRAP(cuMemAlloc, 2);
42 DLWRAP(cuMemAllocHost, 2);
43 DLWRAP(cuMemAllocManaged, 3);
44
45 DLWRAP(cuMemcpyDtoDAsync, 4);
46 DLWRAP(cuMemcpyDtoH, 3);
47 DLWRAP(cuMemcpyDtoHAsync, 4);
48 DLWRAP(cuMemcpyHtoD, 3);
49 DLWRAP(cuMemcpyHtoDAsync, 4);
50
51 DLWRAP(cuMemFree, 1);
52 DLWRAP(cuMemFreeHost, 1);
53 DLWRAP(cuModuleGetFunction, 3);
54 DLWRAP(cuModuleGetGlobal, 4);
55
56 DLWRAP(cuModuleUnload, 1);
57 DLWRAP(cuStreamCreate, 2);
58 DLWRAP(cuStreamDestroy, 1);
59 DLWRAP(cuStreamSynchronize, 1);
60 DLWRAP(cuCtxSetCurrent, 1);
61 DLWRAP(cuDevicePrimaryCtxRelease, 1);
62 DLWRAP(cuDevicePrimaryCtxGetState, 3);
63 DLWRAP(cuDevicePrimaryCtxSetFlags, 2);
64 DLWRAP(cuDevicePrimaryCtxRetain, 2);
65 DLWRAP(cuModuleLoadDataEx, 5);
66
67 DLWRAP(cuDeviceCanAccessPeer, 3);
68 DLWRAP(cuCtxEnablePeerAccess, 2);
69 DLWRAP(cuMemcpyPeerAsync, 6);
70
71 DLWRAP(cuCtxGetLimit, 2);
72 DLWRAP(cuCtxSetLimit, 2);
73
74 DLWRAP(cuEventCreate, 2);
75 DLWRAP(cuEventRecord, 2);
76 DLWRAP(cuStreamWaitEvent, 3);
77 DLWRAP(cuEventSynchronize, 1);
78 DLWRAP(cuEventDestroy, 1);
79
80 DLWRAP_FINALIZE();
81
82 #ifndef DYNAMIC_CUDA_PATH
83 #define DYNAMIC_CUDA_PATH "libcuda.so"
84 #endif
85
86 #define TARGET_NAME CUDA
87 #define DEBUG_PREFIX "Target " GETNAME(TARGET_NAME) " RTL"
88
checkForCUDA()89 static bool checkForCUDA() {
90 // return true if dlopen succeeded and all functions found
91
92 // Prefer _v2 versions of functions if found in the library
93 std::unordered_map<std::string, const char *> TryFirst = {
94 {"cuMemAlloc", "cuMemAlloc_v2"},
95 {"cuMemFree", "cuMemFree_v2"},
96 {"cuMemcpyDtoH", "cuMemcpyDtoH_v2"},
97 {"cuMemcpyHtoD", "cuMemcpyHtoD_v2"},
98 {"cuStreamDestroy", "cuStreamDestroy_v2"},
99 {"cuModuleGetGlobal", "cuModuleGetGlobal_v2"},
100 {"cuMemcpyDtoHAsync", "cuMemcpyDtoHAsync_v2"},
101 {"cuMemcpyDtoDAsync", "cuMemcpyDtoDAsync_v2"},
102 {"cuMemcpyHtoDAsync", "cuMemcpyHtoDAsync_v2"},
103 {"cuDevicePrimaryCtxRelease", "cuDevicePrimaryCtxRelease_v2"},
104 {"cuDevicePrimaryCtxSetFlags", "cuDevicePrimaryCtxSetFlags_v2"},
105 };
106
107 const char *CudaLib = DYNAMIC_CUDA_PATH;
108 void *DynlibHandle = dlopen(CudaLib, RTLD_NOW);
109 if (!DynlibHandle) {
110 DP("Unable to load library '%s': %s!\n", CudaLib, dlerror());
111 return false;
112 }
113
114 for (size_t I = 0; I < dlwrap::size(); I++) {
115 const char *Sym = dlwrap::symbol(I);
116
117 auto It = TryFirst.find(Sym);
118 if (It != TryFirst.end()) {
119 const char *First = It->second;
120 void *P = dlsym(DynlibHandle, First);
121 if (P) {
122 DP("Implementing %s with dlsym(%s) -> %p\n", Sym, First, P);
123 *dlwrap::pointer(I) = P;
124 continue;
125 }
126 }
127
128 void *P = dlsym(DynlibHandle, Sym);
129 if (P == nullptr) {
130 DP("Unable to find '%s' in '%s'!\n", Sym, CudaLib);
131 return false;
132 }
133 DP("Implementing %s with dlsym(%s) -> %p\n", Sym, Sym, P);
134
135 *dlwrap::pointer(I) = P;
136 }
137
138 return true;
139 }
140
cuInit(unsigned X)141 CUresult cuInit(unsigned X) {
142 // Note: Called exactly once from cuda rtl.cpp in a global constructor so
143 // does not need to handle being called repeatedly or concurrently
144 if (!checkForCUDA()) {
145 return CUDA_ERROR_INVALID_HANDLE;
146 }
147 return dlwrap_cuInit(X);
148 }
149