1//===- NVPTXArch.cpp - list installed NVPTX devies ------*- 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// This file implements a tool for detecting name of CUDA gpus installed in the
10// system.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Basic/Version.h"
15#include "llvm/Support/CommandLine.h"
16#include "llvm/Support/DynamicLibrary.h"
17#include "llvm/Support/Error.h"
18#include <cstdint>
19#include <cstdio>
20#include <memory>
21
22using namespace llvm;
23
24static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden);
25
26static void PrintVersion(raw_ostream &OS) {
27 OS << clang::getClangToolFullVersion(ToolName: "nvptx-arch") << '\n';
28}
29// Mark all our options with this category, everything else (except for -version
30// and -help) will be hidden.
31static cl::OptionCategory NVPTXArchCategory("nvptx-arch options");
32
33typedef enum cudaError_enum {
34 CUDA_SUCCESS = 0,
35 CUDA_ERROR_NO_DEVICE = 100,
36} CUresult;
37
38typedef enum CUdevice_attribute_enum {
39 CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MAJOR = 75,
40 CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MINOR = 76,
41} CUdevice_attribute;
42
43typedef uint32_t CUdevice;
44
45CUresult (*cuInit)(unsigned int);
46CUresult (*cuDeviceGetCount)(int *);
47CUresult (*cuGetErrorString)(CUresult, const char **);
48CUresult (*cuDeviceGet)(CUdevice *, int);
49CUresult (*cuDeviceGetAttribute)(int *, CUdevice_attribute, CUdevice);
50
51constexpr const char *DynamicCudaPath = "libcuda.so.1";
52
53llvm::Error loadCUDA() {
54 std::string ErrMsg;
55 auto DynlibHandle = std::make_unique<llvm::sys::DynamicLibrary>(
56 args: llvm::sys::DynamicLibrary::getPermanentLibrary(filename: DynamicCudaPath, errMsg: &ErrMsg));
57 if (!DynlibHandle->isValid()) {
58 return llvm::createStringError(EC: llvm::inconvertibleErrorCode(),
59 Fmt: "Failed to 'dlopen' %s", Vals: DynamicCudaPath);
60 }
61#define DYNAMIC_INIT(SYMBOL) \
62 { \
63 void *SymbolPtr = DynlibHandle->getAddressOfSymbol(#SYMBOL); \
64 if (!SymbolPtr) \
65 return llvm::createStringError(llvm::inconvertibleErrorCode(), \
66 "Failed to 'dlsym' " #SYMBOL); \
67 SYMBOL = reinterpret_cast<decltype(SYMBOL)>(SymbolPtr); \
68 }
69 DYNAMIC_INIT(cuInit);
70 DYNAMIC_INIT(cuDeviceGetCount);
71 DYNAMIC_INIT(cuGetErrorString);
72 DYNAMIC_INIT(cuDeviceGet);
73 DYNAMIC_INIT(cuDeviceGetAttribute);
74#undef DYNAMIC_INIT
75 return llvm::Error::success();
76}
77
78static int handleError(CUresult Err) {
79 const char *ErrStr = nullptr;
80 CUresult Result = cuGetErrorString(Err, &ErrStr);
81 if (Result != CUDA_SUCCESS)
82 return 1;
83 fprintf(stderr, format: "CUDA error: %s\n", ErrStr);
84 return 1;
85}
86
87int main(int argc, char *argv[]) {
88 cl::HideUnrelatedOptions(Category&: NVPTXArchCategory);
89
90 cl::SetVersionPrinter(PrintVersion);
91 cl::ParseCommandLineOptions(
92 argc, argv,
93 Overview: "A tool to detect the presence of NVIDIA devices on the system. \n\n"
94 "The tool will output each detected GPU architecture separated by a\n"
95 "newline character. If multiple GPUs of the same architecture are found\n"
96 "a string will be printed for each\n");
97
98 if (Help) {
99 cl::PrintHelpMessage();
100 return 0;
101 }
102
103 // Attempt to load the NVPTX driver runtime.
104 if (llvm::Error Err = loadCUDA()) {
105 logAllUnhandledErrors(E: std::move(Err), OS&: llvm::errs());
106 return 1;
107 }
108
109 if (CUresult Err = cuInit(0)) {
110 if (Err == CUDA_ERROR_NO_DEVICE)
111 return 0;
112 else
113 return handleError(Err);
114 }
115
116 int Count = 0;
117 if (CUresult Err = cuDeviceGetCount(&Count))
118 return handleError(Err);
119 if (Count == 0)
120 return 0;
121 for (int DeviceId = 0; DeviceId < Count; ++DeviceId) {
122 CUdevice Device;
123 if (CUresult Err = cuDeviceGet(&Device, DeviceId))
124 return handleError(Err);
125
126 int32_t Major, Minor;
127 if (CUresult Err = cuDeviceGetAttribute(
128 &Major, CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MAJOR, Device))
129 return handleError(Err);
130 if (CUresult Err = cuDeviceGetAttribute(
131 &Minor, CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MINOR, Device))
132 return handleError(Err);
133
134 printf(format: "sm_%d%d\n", Major, Minor);
135 }
136 return 0;
137}
138

source code of clang/tools/nvptx-arch/NVPTXArch.cpp