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| 1 | +/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved. |
| 2 | + * |
| 3 | + * Redistribution and use in source and binary forms, with or without |
| 4 | + * modification, are permitted provided that the following conditions |
| 5 | + * are met: |
| 6 | + * * Redistributions of source code must retain the above copyright |
| 7 | + * notice, this list of conditions and the following disclaimer. |
| 8 | + * * Redistributions in binary form must reproduce the above copyright |
| 9 | + * notice, this list of conditions and the following disclaimer in the |
| 10 | + * documentation and/or other materials provided with the distribution. |
| 11 | + * * Neither the name of NVIDIA CORPORATION nor the names of its |
| 12 | + * contributors may be used to endorse or promote products derived |
| 13 | + * from this software without specific prior written permission. |
| 14 | + * |
| 15 | + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY |
| 16 | + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 18 | + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| 19 | + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 20 | + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 21 | + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 22 | + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| 23 | + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 24 | + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 25 | + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | + */ |
| 27 | + |
| 28 | +#include <cuda.h> |
| 29 | +#include <nvJitLink.h> |
| 30 | +#include <nvrtc.h> |
| 31 | +#include <iostream> |
| 32 | +#include <cstring> |
| 33 | + |
| 34 | +#define NUM_THREADS 128 |
| 35 | +#define NUM_BLOCKS 32 |
| 36 | + |
| 37 | +#define NVRTC_SAFE_CALL(x) \ |
| 38 | + do { \ |
| 39 | + nvrtcResult result = x; \ |
| 40 | + if (result != NVRTC_SUCCESS) { \ |
| 41 | + std::cerr << "\nerror: " #x " failed with error " \ |
| 42 | + << nvrtcGetErrorString(result) << '\n'; \ |
| 43 | + exit(1); \ |
| 44 | + } \ |
| 45 | + } while(0) |
| 46 | +#define CUDA_SAFE_CALL(x) \ |
| 47 | + do { \ |
| 48 | + CUresult result = x; \ |
| 49 | + if (result != CUDA_SUCCESS) { \ |
| 50 | + const char *msg; \ |
| 51 | + cuGetErrorName(result, &msg); \ |
| 52 | + std::cerr << "\nerror: " #x " failed with error " \ |
| 53 | + << msg << '\n'; \ |
| 54 | + exit(1); \ |
| 55 | + } \ |
| 56 | + } while(0) |
| 57 | +#define NVJITLINK_SAFE_CALL(h,x) \ |
| 58 | + do { \ |
| 59 | + nvJitLinkResult result = x; \ |
| 60 | + if (result != NVJITLINK_SUCCESS) { \ |
| 61 | + std::cerr << "\nerror: " #x " failed with error " \ |
| 62 | + << result << '\n'; \ |
| 63 | + size_t lsize; \ |
| 64 | + result = nvJitLinkGetErrorLogSize(h, &lsize); \ |
| 65 | + if (result == NVJITLINK_SUCCESS && lsize > 0) { \ |
| 66 | + char *log = (char*)malloc(lsize); \ |
| 67 | + result = nvJitLinkGetErrorLog(h, log); \ |
| 68 | + if (result == NVJITLINK_SUCCESS) { \ |
| 69 | + std::cerr << "error log: " << log << '\n'; \ |
| 70 | + free(log); \ |
| 71 | + } \ |
| 72 | + } \ |
| 73 | + exit(1); \ |
| 74 | + } \ |
| 75 | + } while(0) |
| 76 | + |
| 77 | +const char *lto_saxpy = " \n\ |
| 78 | +extern __device__ float compute(float a, float x, float y); \n\ |
| 79 | + \n\ |
| 80 | +extern \"C\" __global__ \n\ |
| 81 | +void saxpy(float a, float *x, float *y, float *out, size_t n) \n\ |
| 82 | +{ \n\ |
| 83 | + size_t tid = blockIdx.x * blockDim.x + threadIdx.x; \n\ |
| 84 | + if (tid < n) { \n\ |
| 85 | + out[tid] = compute(a, x[tid], y[tid]); \n\ |
| 86 | + } \n\ |
| 87 | +} \n"; |
| 88 | + |
| 89 | +const char *lto_compute = " \n\ |
| 90 | +__device__ float compute(float a, float x, float y) { \n\ |
| 91 | + return a * x + y; \n\ |
| 92 | +} \n"; |
| 93 | + |
| 94 | +// compile code into LTOIR, returning the IR and its size |
| 95 | +static void getLTOIR (const char *code, const char *name, |
| 96 | + char **ltoIR, size_t *ltoIRSize) |
| 97 | +{ |
| 98 | + // Create an instance of nvrtcProgram with the code string. |
| 99 | + nvrtcProgram prog; |
| 100 | + NVRTC_SAFE_CALL( |
| 101 | + nvrtcCreateProgram(&prog, // prog |
| 102 | + code, // buffer |
| 103 | + name, // name |
| 104 | + 0, // numHeaders |
| 105 | + NULL, // headers |
| 106 | + NULL)); // includeNames |
| 107 | + |
| 108 | + // specify that LTO IR should be generated for LTO operation |
| 109 | + const char *opts[] = {"-dlto", |
| 110 | + "--relocatable-device-code=true"}; |
| 111 | + nvrtcResult compileResult = nvrtcCompileProgram(prog, // prog |
| 112 | + 2, // numOptions |
| 113 | + opts); // options |
| 114 | + // Obtain compilation log from the program. |
| 115 | + size_t logSize; |
| 116 | + NVRTC_SAFE_CALL(nvrtcGetProgramLogSize(prog, &logSize)); |
| 117 | + char *log = new char[logSize]; |
| 118 | + NVRTC_SAFE_CALL(nvrtcGetProgramLog(prog, log)); |
| 119 | + std::cout << log << '\n'; |
| 120 | + delete[] log; |
| 121 | + if (compileResult != NVRTC_SUCCESS) { |
| 122 | + exit(1); |
| 123 | + } |
| 124 | + // Obtain generated LTO IR from the program. |
| 125 | + NVRTC_SAFE_CALL(nvrtcGetLTOIRSize(prog, ltoIRSize)); |
| 126 | + *ltoIR = new char[*ltoIRSize]; |
| 127 | + NVRTC_SAFE_CALL(nvrtcGetLTOIR(prog, *ltoIR)); |
| 128 | + // Destroy the program. |
| 129 | + NVRTC_SAFE_CALL(nvrtcDestroyProgram(&prog)); |
| 130 | +} |
| 131 | + |
| 132 | +int main(int argc, char *argv[]) |
| 133 | +{ |
| 134 | + char *ltoIR1; |
| 135 | + char *ltoIR2; |
| 136 | + size_t ltoIR1Size; |
| 137 | + size_t ltoIR2Size; |
| 138 | + // getLTOIR uses nvrtc to get the LTOIR. |
| 139 | + // We could also use nvcc offline with -dlto -fatbin |
| 140 | + // to generate the IR, but using nvrtc keeps the build simpler. |
| 141 | + getLTOIR(lto_saxpy, "lto_saxpy.cu", <oIR1, <oIR1Size); |
| 142 | + getLTOIR(lto_compute, "lto_compute.cu", <oIR2, <oIR2Size); |
| 143 | + |
| 144 | + CUdevice cuDevice; |
| 145 | + CUcontext context; |
| 146 | + CUmodule module; |
| 147 | + CUfunction kernel; |
| 148 | + CUDA_SAFE_CALL(cuInit(0)); |
| 149 | + CUDA_SAFE_CALL(cuDeviceGet(&cuDevice, 0)); |
| 150 | + CUDA_SAFE_CALL(cuCtxCreate(&context, 0, cuDevice)); |
| 151 | + |
| 152 | + // Dynamically determine the arch to link for |
| 153 | + int major = 0; |
| 154 | + int minor = 0; |
| 155 | + CUDA_SAFE_CALL(cuDeviceGetAttribute(&major, |
| 156 | + CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MAJOR, cuDevice)); |
| 157 | + CUDA_SAFE_CALL(cuDeviceGetAttribute(&minor, |
| 158 | + CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MINOR, cuDevice)); |
| 159 | + int arch = major*10 + minor; |
| 160 | + char smbuf[16]; |
| 161 | + memset(smbuf,0,16); |
| 162 | + sprintf(smbuf, "-arch=sm_%d", arch); |
| 163 | + |
| 164 | + // Load the generated LTO IR and link them together |
| 165 | + nvJitLinkHandle handle; |
| 166 | + const char *lopts[] = {"-lto", smbuf}; |
| 167 | + NVJITLINK_SAFE_CALL(handle, nvJitLinkCreate(&handle, 2, lopts)); |
| 168 | + |
| 169 | + NVJITLINK_SAFE_CALL(handle, nvJitLinkAddData(handle, NVJITLINK_INPUT_LTOIR, |
| 170 | + (void *)ltoIR1, ltoIR1Size, "lto_saxpy")); |
| 171 | + NVJITLINK_SAFE_CALL(handle, nvJitLinkAddData(handle, NVJITLINK_INPUT_LTOIR, |
| 172 | + (void *)ltoIR2, ltoIR2Size, "lto_compute")); |
| 173 | + |
| 174 | + // The call to nvJitLinkComplete causes linker to link together the two |
| 175 | + // LTO IR modules, do optimization on the linked LTO IR, |
| 176 | + // and generate cubin from it. |
| 177 | + NVJITLINK_SAFE_CALL(handle, nvJitLinkComplete(handle)); |
| 178 | + |
| 179 | + // check error log |
| 180 | + size_t logSize; |
| 181 | + NVJITLINK_SAFE_CALL(handle, nvJitLinkGetErrorLogSize(handle, &logSize)); |
| 182 | + if (logSize > 0) { |
| 183 | + char *log = (char*)malloc(logSize+1); |
| 184 | + NVJITLINK_SAFE_CALL(handle, nvJitLinkGetErrorLog(handle, log)); |
| 185 | + std::cout << "Error log: " << log << std::endl; |
| 186 | + free(log); |
| 187 | + } |
| 188 | + |
| 189 | + // get linked cubin |
| 190 | + size_t cubinSize; |
| 191 | + NVJITLINK_SAFE_CALL(handle, nvJitLinkGetLinkedCubinSize(handle, &cubinSize)); |
| 192 | + void *cubin = malloc(cubinSize); |
| 193 | + NVJITLINK_SAFE_CALL(handle, nvJitLinkGetLinkedCubin(handle, cubin)); |
| 194 | + |
| 195 | + NVJITLINK_SAFE_CALL(handle, nvJitLinkDestroy(&handle)); |
| 196 | + delete[] ltoIR1; |
| 197 | + delete[] ltoIR2; |
| 198 | + |
| 199 | + // cubin is linked, so now load it |
| 200 | + CUDA_SAFE_CALL(cuModuleLoadData(&module, cubin)); |
| 201 | + CUDA_SAFE_CALL(cuModuleGetFunction(&kernel, module, "saxpy")); |
| 202 | + |
| 203 | + // Generate input for execution, and create output buffers. |
| 204 | + size_t n = NUM_THREADS * NUM_BLOCKS; |
| 205 | + size_t bufferSize = n * sizeof(float); |
| 206 | + float a = 5.1f; |
| 207 | + float *hX = new float[n], *hY = new float[n], *hOut = new float[n]; |
| 208 | + for (size_t i = 0; i < n; ++i) { |
| 209 | + hX[i] = static_cast<float>(i); |
| 210 | + hY[i] = static_cast<float>(i * 2); |
| 211 | + } |
| 212 | + CUdeviceptr dX, dY, dOut; |
| 213 | + CUDA_SAFE_CALL(cuMemAlloc(&dX, bufferSize)); |
| 214 | + CUDA_SAFE_CALL(cuMemAlloc(&dY, bufferSize)); |
| 215 | + CUDA_SAFE_CALL(cuMemAlloc(&dOut, bufferSize)); |
| 216 | + CUDA_SAFE_CALL(cuMemcpyHtoD(dX, hX, bufferSize)); |
| 217 | + CUDA_SAFE_CALL(cuMemcpyHtoD(dY, hY, bufferSize)); |
| 218 | + // Execute SAXPY. |
| 219 | + void *args[] = { &a, &dX, &dY, &dOut, &n }; |
| 220 | + CUDA_SAFE_CALL( |
| 221 | + cuLaunchKernel(kernel, |
| 222 | + NUM_BLOCKS, 1, 1, // grid dim |
| 223 | + NUM_THREADS, 1, 1, // block dim |
| 224 | + 0, NULL, // shared mem and stream |
| 225 | + args, 0)); // arguments |
| 226 | + CUDA_SAFE_CALL(cuCtxSynchronize()); |
| 227 | + // Retrieve and print output. |
| 228 | + CUDA_SAFE_CALL(cuMemcpyDtoH(hOut, dOut, bufferSize)); |
| 229 | + |
| 230 | + for (size_t i = 0; i < n; ++i) { |
| 231 | + std::cout << a << " * " << hX[i] << " + " << hY[i] |
| 232 | + << " = " << hOut[i] << '\n'; |
| 233 | + } |
| 234 | + // check last value to verify |
| 235 | + if (hOut[n-1] == 29074.5) { |
| 236 | + std::cout << "PASSED!\n"; |
| 237 | + } else { |
| 238 | + std::cout << "values not expected?\n"; |
| 239 | + } |
| 240 | + // Release resources. |
| 241 | + CUDA_SAFE_CALL(cuMemFree(dX)); |
| 242 | + CUDA_SAFE_CALL(cuMemFree(dY)); |
| 243 | + CUDA_SAFE_CALL(cuMemFree(dOut)); |
| 244 | + CUDA_SAFE_CALL(cuModuleUnload(module)); |
| 245 | + CUDA_SAFE_CALL(cuCtxDestroy(context)); |
| 246 | + free(cubin); |
| 247 | + delete[] hX; |
| 248 | + delete[] hY; |
| 249 | + delete[] hOut; |
| 250 | + return 0; |
| 251 | +} |
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