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/*
* cl-utils.c
*
* OpenCL utility functions
*
* (c) 2006-2011 Thomas White <taw@physics.org>
*
* Part of CrystFEL - crystallography with a FEL
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_CL_CL_H
#include <CL/cl.h>
#else
#include <cl.h>
#endif
#include "utils.h"
const char *clError(cl_int err)
{
switch ( err ) {
case CL_SUCCESS : return "no error";
case CL_INVALID_PLATFORM : return "invalid platform";
case CL_INVALID_KERNEL : return "invalid kernel";
case CL_INVALID_ARG_INDEX : return "invalid argument index";
case CL_INVALID_ARG_VALUE : return "invalid argument value";
case CL_INVALID_MEM_OBJECT : return "invalid memory object";
case CL_INVALID_SAMPLER : return "invalid sampler";
case CL_INVALID_ARG_SIZE : return "invalid argument size";
case CL_INVALID_COMMAND_QUEUE : return "invalid command queue";
case CL_INVALID_CONTEXT : return "invalid context";
case CL_INVALID_VALUE : return "invalid value";
case CL_INVALID_EVENT_WAIT_LIST : return "invalid wait list";
case CL_MAP_FAILURE : return "map failure";
case CL_MEM_OBJECT_ALLOCATION_FAILURE : return "object allocation failure";
case CL_OUT_OF_HOST_MEMORY : return "out of host memory";
case CL_OUT_OF_RESOURCES : return "out of resources";
case CL_INVALID_KERNEL_NAME : return "invalid kernel name";
case CL_INVALID_KERNEL_ARGS : return "invalid kernel arguments";
case CL_INVALID_WORK_GROUP_SIZE : return "invalid work group size";
case CL_IMAGE_FORMAT_NOT_SUPPORTED : return "image format not supported";
default :
return "unknown error";
}
}
static char *get_device_string(cl_device_id dev, cl_device_info info)
{
int r;
size_t size;
char *val;
r = clGetDeviceInfo(dev, info, 0, NULL, &size);
if ( r != CL_SUCCESS ) {
ERROR("Couldn't get device vendor size: %s\n",
clError(r));
return NULL;
}
val = malloc(size);
r = clGetDeviceInfo(dev, info, size, val, NULL);
if ( r != CL_SUCCESS ) {
ERROR("Couldn't get dev vendor: %s\n", clError(r));
return NULL;
}
return val;
}
cl_device_id get_cl_dev(cl_context ctx, int n)
{
cl_device_id *dev;
cl_int r;
size_t size;
int i, num_devs;
/* Get the required size of the array */
r = clGetContextInfo(ctx, CL_CONTEXT_DEVICES, 0, NULL, &size);
if ( r != CL_SUCCESS ) {
ERROR("Couldn't get array size for devices: %s\n", clError(r));
return 0;
}
dev = malloc(size);
r = clGetContextInfo(ctx, CL_CONTEXT_DEVICES, size, dev, NULL);
if ( r != CL_SUCCESS ) {
ERROR("Couldn't get device: %s\n", clError(r));
return 0;
}
num_devs = size/sizeof(cl_device_id);
if ( n >= num_devs ) {
ERROR("Device ID out of range\n");
return 0;
}
if ( n < 0 ) {
STATUS("Available devices:\n");
for ( i=0; i<num_devs; i++ ) {
char *vendor;
char *name;
vendor = get_device_string(dev[i], CL_DEVICE_VENDOR);
name = get_device_string(dev[i], CL_DEVICE_NAME);
STATUS("Device %i: %s %s\n", i, vendor, name);
}
n = 0;
STATUS("Using device 0. Use --gpu-dev to choose another.\n");
} else {
char *vendor;
char *name;
vendor = get_device_string(dev[n], CL_DEVICE_VENDOR);
name = get_device_string(dev[n], CL_DEVICE_NAME);
STATUS("Using device %i: %s %s\n", n, vendor, name);
}
return dev[n];
}
static void show_build_log(cl_program prog, cl_device_id dev)
{
cl_int r;
char log[4096];
size_t s;
r = clGetProgramBuildInfo(prog, dev, CL_PROGRAM_BUILD_LOG, 4096, log,
&s);
STATUS("%s\n", log);
}
cl_program load_program(const char *filename, cl_context ctx,
cl_device_id dev, cl_int *err, const char *extra_cflags)
{
FILE *fh;
cl_program prog;
char *source;
size_t len;
cl_int r;
char cflags[1024] = "";
fh = fopen(filename, "r");
if ( fh == NULL ) {
ERROR("Couldn't open '%s'\n", filename);
*err = CL_INVALID_PROGRAM;
return 0;
}
source = malloc(16384);
len = fread(source, 1, 16383, fh);
fclose(fh);
source[len] = '\0';
prog = clCreateProgramWithSource(ctx, 1, (const char **)&source,
NULL, err);
if ( *err != CL_SUCCESS ) {
ERROR("Couldn't load source\n");
return 0;
}
snprintf(cflags, 1023, "-Werror ");
strncat(cflags, "-I"DATADIR"/crystfel/ ", 1023-strlen(cflags));
strncat(cflags, "-cl-no-signed-zeros ", 1023-strlen(cflags));
strncat(cflags, extra_cflags, 1023-strlen(cflags));
r = clBuildProgram(prog, 0, NULL, cflags, NULL, NULL);
if ( r != CL_SUCCESS ) {
ERROR("Couldn't build program '%s'\n", filename);
show_build_log(prog, dev);
*err = r;
return 0;
}
free(source);
*err = CL_SUCCESS;
return prog;
}
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