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| 1 | +/* |
| 2 | +// Copyright (c) 2026 Ben Ashbaugh |
| 3 | +// |
| 4 | +// SPDX-License-Identifier: MIT |
| 5 | +*/ |
| 6 | + |
| 7 | +#include <memory> |
| 8 | +#include <popl/popl.hpp> |
| 9 | + |
| 10 | +#include <CL/opencl.hpp> |
| 11 | + |
| 12 | +#include "util.hpp" |
| 13 | + |
| 14 | +const size_t gwx = 1024*1024; |
| 15 | + |
| 16 | +static const char kernelString[] = R"CLC( |
| 17 | +kernel void CopyBuffer( global uint* dst, global uint* src ) |
| 18 | +{ |
| 19 | + uint id = get_global_id(0); |
| 20 | + dst[id] = src[id]; |
| 21 | +} |
| 22 | +)CLC"; |
| 23 | + |
| 24 | +struct SVMDeleter |
| 25 | +{ |
| 26 | + SVMDeleter(cl::Context& _c) : context(_c) {} |
| 27 | + void operator()(void* ptr) { |
| 28 | + clSVMFree(context(), ptr); |
| 29 | + } |
| 30 | + cl::Context context; |
| 31 | +}; |
| 32 | + |
| 33 | +int main( |
| 34 | + int argc, |
| 35 | + char** argv ) |
| 36 | +{ |
| 37 | + int platformIndex = 0; |
| 38 | + int deviceIndex = 0; |
| 39 | + |
| 40 | + { |
| 41 | + popl::OptionParser op("Supported Options"); |
| 42 | + op. add<popl::Value< int>>( "p", "platform", "Platform Index", platformIndex, &platformIndex); |
| 43 | + op. add<popl::Value< int>>( "d", "device", "Device Index", deviceIndex, &deviceIndex); |
| 44 | + bool printUsage = false; |
| 45 | + try { |
| 46 | + op.parse(argc, argv); |
| 47 | + } catch (std::exception& e) { |
| 48 | + fprintf(stderr, "Error: %s\n\n", e.what()); |
| 49 | + printUsage = true; |
| 50 | + } |
| 51 | + |
| 52 | + if (printUsage || !op.unknown_options().empty() || !op.non_option_args().empty()) { |
| 53 | + fprintf(stderr, |
| 54 | + "Usage: dmemhelloworld [options]\n" |
| 55 | + "%s", op.help().c_str()); |
| 56 | + return -1; |
| 57 | + } |
| 58 | + } |
| 59 | + |
| 60 | + std::vector<cl::Platform> platforms; |
| 61 | + cl::Platform::get(&platforms); |
| 62 | + |
| 63 | + if (!checkPlatformIndex(platforms, platformIndex)) { |
| 64 | + return -1; |
| 65 | + } |
| 66 | + |
| 67 | + printf("Running on platform: %s\n", |
| 68 | + platforms[platformIndex].getInfo<CL_PLATFORM_NAME>().c_str() ); |
| 69 | + |
| 70 | + std::vector<cl::Device> devices; |
| 71 | + platforms[platformIndex].getDevices(CL_DEVICE_TYPE_ALL, &devices); |
| 72 | + |
| 73 | + printf("Running on device: %s\n", |
| 74 | + devices[deviceIndex].getInfo<CL_DEVICE_NAME>().c_str() ); |
| 75 | + |
| 76 | + cl_device_svm_capabilities svmcaps = devices[deviceIndex].getInfo<CL_DEVICE_SVM_CAPABILITIES>(); |
| 77 | + if( svmcaps & CL_DEVICE_SVM_COARSE_GRAIN_BUFFER ) { |
| 78 | + printf("Device supports CL_DEVICE_SVM_COARSE_GRAIN_BUFFER.\n"); |
| 79 | + } else { |
| 80 | + printf("Device does not support CL_DEVICE_SVM_COARSE_GRAIN_BUFFER, exiting.\n"); |
| 81 | + return -1; |
| 82 | + } |
| 83 | + |
| 84 | + cl::Context context{devices[deviceIndex]}; |
| 85 | + cl::CommandQueue commandQueue{context, devices[deviceIndex]}; |
| 86 | + |
| 87 | + cl::Program program{ context, kernelString }; |
| 88 | + program.build(); |
| 89 | + cl::Kernel kernel = cl::Kernel{ program, "CopyBuffer" }; |
| 90 | + |
| 91 | + { |
| 92 | + constexpr size_t count = gwx + 4; |
| 93 | + |
| 94 | + std::unique_ptr<cl_int[], SVMDeleter> src( |
| 95 | + (cl_int*)clSVMAlloc( |
| 96 | + context(), |
| 97 | + CL_MEM_READ_WRITE, |
| 98 | + count * sizeof(cl_int), |
| 99 | + 0), |
| 100 | + SVMDeleter(context)); |
| 101 | + std::unique_ptr<cl_int[], SVMDeleter> dst( |
| 102 | + (cl_int*)clSVMAlloc( |
| 103 | + context(), |
| 104 | + CL_MEM_READ_WRITE, |
| 105 | + count * sizeof(cl_int), |
| 106 | + 0), |
| 107 | + SVMDeleter(context)); |
| 108 | + |
| 109 | + if (src && dst) { |
| 110 | + // initialization |
| 111 | + { |
| 112 | + commandQueue.enqueueMapSVM( |
| 113 | + src, |
| 114 | + CL_TRUE, |
| 115 | + CL_MAP_WRITE_INVALIDATE_REGION, |
| 116 | + count * sizeof(cl_int) ); |
| 117 | + for( size_t i = 0; i < count; i++ ) |
| 118 | + { |
| 119 | + auto val = static_cast<cl_int>(i); |
| 120 | + src[i] = val; |
| 121 | + dst[i] = -val; |
| 122 | + } |
| 123 | + |
| 124 | + commandQueue.enqueueUnmapSVM( src ); |
| 125 | + } |
| 126 | + |
| 127 | + // execution |
| 128 | + constexpr size_t dstOffset = 1; |
| 129 | + constexpr size_t srcOffset = 2; |
| 130 | + printf("Setting dst argument with offset: %zu\n", dstOffset); |
| 131 | + kernel.setArg( 0, dst.get() + dstOffset ); |
| 132 | + printf("Setting src argument with offset: %zu\n", srcOffset); |
| 133 | + kernel.setArg( 1, src.get() + srcOffset ); |
| 134 | + commandQueue.enqueueNDRangeKernel( |
| 135 | + kernel, |
| 136 | + cl::NullRange, |
| 137 | + cl::NDRange{gwx} ); |
| 138 | + |
| 139 | + // verification |
| 140 | + { |
| 141 | + commandQueue.enqueueMapSVM( |
| 142 | + dst, |
| 143 | + CL_TRUE, |
| 144 | + CL_MAP_READ, |
| 145 | + count * sizeof(cl_uint) ); |
| 146 | + |
| 147 | + size_t mismatches = 0; |
| 148 | + |
| 149 | + for (size_t i = 0; i < dstOffset; i++) { |
| 150 | + if (dst[i] != i) { |
| 151 | + fprintf(stderr, "MisMatch at dst buffer start! dst[%zu] = %08X, want %08X\n", |
| 152 | + i, |
| 153 | + dst[i], |
| 154 | + (cl_int)i ); |
| 155 | + mismatches++; |
| 156 | + } |
| 157 | + } |
| 158 | + |
| 159 | + |
| 160 | + for (size_t i = 0; i < gwx; i++) { |
| 161 | + auto ci = i + dstOffset; |
| 162 | + auto cv = i + srcOffset; |
| 163 | + if (dst[ci] != cv) { |
| 164 | + if (mismatches < 16) { |
| 165 | + fprintf(stderr, "MisMatch! dst[%zu] == %08X, want %08X\n", |
| 166 | + ci, |
| 167 | + dst[ci], |
| 168 | + (cl_int)cv ); |
| 169 | + } |
| 170 | + mismatches++; |
| 171 | + } |
| 172 | + } |
| 173 | + |
| 174 | + commandQueue.enqueueUnmapSVM( dst ); |
| 175 | + |
| 176 | + if (mismatches) { |
| 177 | + fprintf(stderr, "Error: Found %zu mismatches / %zu values!!!\n", |
| 178 | + mismatches, |
| 179 | + count ); |
| 180 | + } else { |
| 181 | + printf("Success.\n"); |
| 182 | + } |
| 183 | + } |
| 184 | + } else { |
| 185 | + printf("Allocation failed - does this device support SVM?\n"); |
| 186 | + } |
| 187 | + |
| 188 | + printf("Cleaning up...\n"); |
| 189 | + } |
| 190 | + |
| 191 | + return 0; |
| 192 | +} |
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