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#include <CL/cl.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include "util.h"
#define CASE_ERR(ec) case ec: return #ec;
const char * cluErrorString(cl_int error)
{
switch(error) {
CASE_ERR(CL_DEVICE_NOT_AVAILABLE);
CASE_ERR(CL_DEVICE_NOT_FOUND);
CASE_ERR(CL_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST);
CASE_ERR(CL_INVALID_ARG_INDEX);
CASE_ERR(CL_INVALID_ARG_SIZE);
CASE_ERR(CL_INVALID_ARG_VALUE);
CASE_ERR(CL_INVALID_COMMAND_QUEUE);
CASE_ERR(CL_INVALID_CONTEXT);
CASE_ERR(CL_INVALID_DEVICE);
CASE_ERR(CL_INVALID_DEVICE_TYPE);
CASE_ERR(CL_INVALID_EVENT_WAIT_LIST);
CASE_ERR(CL_INVALID_GLOBAL_OFFSET);
CASE_ERR(CL_INVALID_GLOBAL_WORK_SIZE);
CASE_ERR(CL_INVALID_IMAGE_SIZE);
CASE_ERR(CL_INVALID_KERNEL);
CASE_ERR(CL_INVALID_KERNEL_ARGS);
CASE_ERR(CL_INVALID_KERNEL_DEFINITION);
CASE_ERR(CL_INVALID_KERNEL_NAME);
CASE_ERR(CL_INVALID_MEM_OBJECT);
CASE_ERR(CL_INVALID_OPERATION);
CASE_ERR(CL_INVALID_PLATFORM);
CASE_ERR(CL_INVALID_PROGRAM);
CASE_ERR(CL_INVALID_PROGRAM_EXECUTABLE);
CASE_ERR(CL_INVALID_PROPERTY);
CASE_ERR(CL_INVALID_SAMPLER);
CASE_ERR(CL_INVALID_VALUE);
CASE_ERR(CL_INVALID_WORK_DIMENSION);
CASE_ERR(CL_INVALID_WORK_GROUP_SIZE);
CASE_ERR(CL_INVALID_WORK_ITEM_SIZE);
CASE_ERR(CL_MEM_OBJECT_ALLOCATION_FAILURE);
CASE_ERR(CL_MISALIGNED_SUB_BUFFER_OFFSET);
CASE_ERR(CL_OUT_OF_HOST_MEMORY);
CASE_ERR(CL_OUT_OF_RESOURCES);
CASE_ERR(CL_SUCCESS);
}
}
unsigned cluInitGpuDevice(cl_device_id * device_id)
{
cl_int error;
cl_uint total_platforms;
cl_platform_id platform_id;
cl_uint total_gpu_devices;
error = clGetPlatformIDs(
1, /* Max number of platform IDs to return */
&platform_id, /* Pointer to platform_id */
&total_platforms); /* Total number of platforms
* found on the system */
if (error != CL_SUCCESS) {
fprintf(stderr, "clGetPlatformIDs() failed: %s\n", cluErrorString(error));
return 0;
}
fprintf(stderr, "There are %u platforms.\n", total_platforms);
error = clGetDeviceIDs(platform_id,
CL_DEVICE_TYPE_GPU,
1,
device_id,
&total_gpu_devices);
if (error != CL_SUCCESS) {
fprintf(stderr, "clGetDeviceIDs() failed: %s\n", cluErrorString(error));
return 0;
}
fprintf(stderr, "There are %u GPU devices.\n", total_gpu_devices);
return 1;
}
unsigned cluCreateContext(cl_context * context, cl_device_id device_id)
{
cl_int error;
*context = clCreateContext(NULL, /* Properties */
1, /* Number of devices */
&device_id, /* Device pointer */
NULL, /* Callback for reporting errors */
NULL, /* User data to pass to error callback */
&error); /* Error code */
if (error != CL_SUCCESS) {
fprintf(stderr, "clCreateContext() failed: %s\n",
cluErrorString(error));
return 0;
}
return 1;
}
unsigned cluCreateCommandQueue(cl_command_queue * command_queue,
cl_context context, cl_device_id device_id)
{
cl_int error;
*command_queue = clCreateCommandQueue(context,
device_id,
0, /* Command queue properties */
&error); /* Error code */
if (error != CL_SUCCESS) {
fprintf(stderr, "clCreateCommandQueue() failed: %s\n",
cluErrorString(error));
return 0;
}
return 1;
}
#define CODE_CHUNK 64
unsigned cluCreateKernel(cl_context context, cl_device_id device_id,
cl_kernel * kernel, const char * kernel_name)
{
char * filename;
char * code = NULL;
size_t code_len = 0;
int fd;
int bytes_read;
/* +3 .cl
* +1 NULL byte
* --
* +4
*/
unsigned filename_len = strlen(kernel_name) + 4;
cl_int error;
cl_program program;
/* Determine file name */
filename = malloc (filename_len + 4);
if (!filename) {
fprintf(stderr, "Failed to malloc filename.\n");
return 0;
}
snprintf(filename, filename_len, "%s.cl", kernel_name);
/* Open file */
fd = open(filename, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Failed to open file: %s\n", filename);
return 0;
}
/* Read code */
do {
code = realloc(code, (code_len + CODE_CHUNK) * sizeof(unsigned char));
if (!code) {
fprintf(stderr, "Failed to realloc code.\n");
return 0;
}
bytes_read = read(fd, code + code_len, CODE_CHUNK);
if (bytes_read < 0) {
fprintf(stderr, "Failed to read code.\n");
return 0;
}
code_len += bytes_read;
} while(bytes_read == CODE_CHUNK);
/* Create program */
program = clCreateProgramWithSource(context,
1, /* Number of strings */
&code,
&code_len, /* String lengths, 0 means all the
* strings are NULL terminated. */
&error);
if (error != CL_SUCCESS) {
fprintf(stderr, "clCreateProgramWithSource() failed: %s\n",
cluErrorString(error));
return 0;
}
fprintf(stderr, "clCreateProgramWithSource() suceeded.\n");
/* Build program */
error = clBuildProgram(program,
1, /* Number of devices */
&device_id,
NULL, /* options */
NULL, /* callback function when compile is complete */
NULL); /* user data for callback */
if (error != CL_SUCCESS) {
char build_str[10000];
error = clGetProgramBuildInfo(program,
device_id,
CL_PROGRAM_BUILD_LOG,
10000, /* Size of output string */
build_str, /* pointer to write the log to */
NULL); /* Number of bytes written to the log */
if (error != CL_SUCCESS) {
fprintf(stderr, "clGetProgramBuildInfo() failed: %s\n",
cluErrorString(error));
} else {
fprintf(stderr, "Build Log: \n%s\n\n", build_str);
}
return 0;
}
fprintf(stderr, "clBuildProgram() suceeded.\n");
*kernel = clCreateKernel(program, kernel_name, &error);
if (error != CL_SUCCESS) {
fprintf(stderr, "clCreateKernel() failed: %s\n", cluErrorString(error));
return 0;
}
fprintf(stderr, "clCreateKernel() suceeded.\n");
return 1;
}
unsigned cluKernelSetArg(cl_kernel kernel, cl_uint index, size_t size,
const void * value)
{
cl_int error;
error = clSetKernelArg(kernel, index, size, value);
if (error != CL_SUCCESS) {
fprintf(stderr, "clSetKernelArg failed: %s\n", cluErrorString(error));
return 0;
}
fprintf(stderr, "clSetKernelArg() succeeded.\n");
return 1;
}
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