126 lines
4.0 KiB
C
126 lines
4.0 KiB
C
#define _GNU_SOURCE
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#include "matmul.h"
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#include "util.h"
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#include <CL/cl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define CHECK_ERROR(err) \
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if (err != CL_SUCCESS) { \
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printf("[%s:%d] OpenCL error %d\n", __FILE__, __LINE__, err); \
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exit(EXIT_FAILURE); \
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}
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static cl_int err;
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static cl_platform_id platform;
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static cl_device_id device;
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static cl_context context;
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static cl_command_queue queue;
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static cl_program program;
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static cl_kernel kernel;
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static cl_mem a_d, b_d, c_d;
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void matmul(const float *A, const float *B, float *C, int M, int N, int K) {
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// TODO: FILL_IN_HERE
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}
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static void print_platform_info(cl_platform_id platform) {
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size_t sz;
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char *buf;
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CHECK_ERROR(clGetPlatformInfo(platform, CL_PLATFORM_NAME, 0, NULL, &sz));
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buf = (char *)malloc(sz);
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CHECK_ERROR(clGetPlatformInfo(platform, CL_PLATFORM_NAME, sz, buf, NULL));
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printf("Detected OpenCL platform: %s\n", buf);
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free(buf);
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}
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static void print_device_info(cl_device_id device) {
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size_t sz;
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char *buf;
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CHECK_ERROR(clGetDeviceInfo(device, CL_DEVICE_NAME, 0, NULL, &sz));
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buf = (char *)malloc(sz);
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CHECK_ERROR(clGetDeviceInfo(device, CL_DEVICE_NAME, sz, buf, NULL));
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printf("Detected OpenCL device: %s\n", buf);
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free(buf);
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}
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static cl_program create_and_build_program_with_source(cl_context context,
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cl_device_id device,
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const char *file_name) {
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FILE *file = fopen(file_name, "rb");
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if (file == NULL) {
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printf("Failed to open %s\n", file_name);
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exit(EXIT_FAILURE);
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}
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fseek(file, 0, SEEK_END);
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size_t source_size = ftell(file);
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rewind(file);
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char *source_code = (char *)malloc(source_size + 1);
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size_t ntotal = 0;
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while (ntotal < source_size) {
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int nread = fread(source_code, sizeof(char), source_size, file);
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ntotal += nread;
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}
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source_code[source_size] = '\0';
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fclose(file);
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cl_program program = clCreateProgramWithSource(
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context, 1, (const char **)&source_code, &source_size, &err);
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CHECK_ERROR(err);
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free(source_code);
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err = clBuildProgram(program, 1, &device, "", NULL, NULL);
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if (err == CL_BUILD_PROGRAM_FAILURE) {
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size_t log_size;
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CHECK_ERROR(clGetProgramBuildInfo(program, device, CL_PROGRAM_BUILD_LOG, 0,
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NULL, &log_size));
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char *log = (char *)malloc(log_size + 1);
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CHECK_ERROR(clGetProgramBuildInfo(program, device, CL_PROGRAM_BUILD_LOG,
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log_size, log, NULL));
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log[log_size] = 0;
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printf("Compile error:\n%s\n", log);
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free(log);
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}
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CHECK_ERROR(err);
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return program;
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}
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void matmul_initialize(int M, int N, int K) {
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// Get OpenCL platform
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err = clGetPlatformIDs(1, &platform, NULL);
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CHECK_ERROR(err);
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print_platform_info(platform);
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// Get OpenCL device (only 1)
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err = clGetDeviceIDs(platform, CL_DEVICE_TYPE_GPU, 1, &device, NULL);
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CHECK_ERROR(err);
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print_device_info(device);
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// Create OpenCL context
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context = clCreateContext(NULL, 1, &device, NULL, NULL, &err);
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CHECK_ERROR(err);
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// Create OpenCL command queue
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queue = clCreateCommandQueue(context, device, 0, &err);
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CHECK_ERROR(err);
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// Compile program from "kernel.cl"
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program = create_and_build_program_with_source(context, device, "kernel.cl");
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// Extract kernel from compiled program
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kernel = clCreateKernel(program, "sgemm", &err);
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CHECK_ERROR(err);
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// Create GPU buffers
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a_d = clCreateBuffer(context, CL_MEM_READ_WRITE, M * K * sizeof(float), NULL,
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&err);
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CHECK_ERROR(err);
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b_d = clCreateBuffer(context, CL_MEM_READ_WRITE, K * N * sizeof(float), NULL,
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&err);
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CHECK_ERROR(err);
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c_d = clCreateBuffer(context, CL_MEM_READ_WRITE, M * N * sizeof(float), NULL,
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&err);
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CHECK_ERROR(err);
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}
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void matmul_finalize() {}
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