clang/tools/nvptx-arch/NVPTXArch.cpp

   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
  22 using namespace llvm;
  23
  24 static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden);
  25
  26 static void PrintVersion(raw_ostream &OS) {
  27   OS << clang::getClangToolFullVersion("nvptx-arch") << '\n';
  28 }
  29 // Mark all our options with this category, everything else (except for -version
  30 // and -help) will be hidden.
  31 static cl::OptionCategory NVPTXArchCategory("nvptx-arch options");
  32
  33 typedef enum cudaError_enum {
  34   CUDA_SUCCESS = 0,
  35   CUDA_ERROR_NO_DEVICE = 100,
  36 } CUresult;
  37
  38 typedef enum CUdevice_attribute_enum {
  39   CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MAJOR = 75,
  40   CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MINOR = 76,
  41 } CUdevice_attribute;
  42
  43 typedef uint32_t CUdevice;
  44
  45 CUresult (*cuInit)(unsigned int);
  46 CUresult (*cuDeviceGetCount)(int *);
  47 CUresult (*cuGetErrorString)(CUresult, const char **);
  48 CUresult (*cuDeviceGet)(CUdevice *, int);
  49 CUresult (*cuDeviceGetAttribute)(int *, CUdevice_attribute, CUdevice);
  50
  51 constexpr const char *DynamicCudaPath = "libcuda.so.1";
  52
  53 llvm::Error loadCUDA() {
  54   std::string ErrMsg;
  55   auto DynlibHandle = std::make_unique<llvm::sys::DynamicLibrary>(
  56       llvm::sys::DynamicLibrary::getPermanentLibrary(DynamicCudaPath, &ErrMsg));
  57   if (!DynlibHandle->isValid()) {
  58     return llvm::createStringError(llvm::inconvertibleErrorCode(),
  59                                    "Failed to 'dlopen' %s", 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
  78 static 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, "CUDA error: %s\n", ErrStr);
  84   return 1;
  85 }
  86
  87 int main(int argc, char *argv[]) {
  88   cl::HideUnrelatedOptions(NVPTXArchCategory);
  89
  90   cl::SetVersionPrinter(PrintVersion);
  91   cl::ParseCommandLineOptions(
  92       argc, argv,
  93       "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(std::move(Err), 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("sm_%d%d\n", Major, Minor);
 135   }
 136   return 0;
 137 }