opencl.h
/*
* Copyright © 2012-2013 Inria. All rights reserved.
* Copyright © 2013 Université Bordeaux 1. All right reserved.
* See COPYING in top-level directory.
*/
#ifndef HWLOC_OPENCL_H
#define HWLOC_OPENCL_H
#include <hwloc.h>
#include <hwloc/autogen/config.h>
#include <hwloc/helper.h>
#ifdef HWLOC_LINUX_SYS
#include <hwloc/linux.h>
#endif
#include <CL/cl.h>
#include <CL/cl_ext.h>
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
static inline int
hwloc_opencl_get_device_cpuset(hwloc_topology_t topology ,
cl_device_id device ,
hwloc_cpuset_t set)
{
#if (defined HWLOC_LINUX_SYS) && (defined CL_DEVICE_TOPOLOGY_AMD)
/* If we're on Linux + AMD OpenCL, use the AMD extension + the sysfs mechanism to get the local cpus */
#define HWLOC_OPENCL_DEVICE_SYSFS_PATH_MAX 128
char path[HWLOC_OPENCL_DEVICE_SYSFS_PATH_MAX];
FILE *sysfile = NULL;
cl_device_topology_amd amdtopo;
cl_int clret;
if (!hwloc_topology_is_thissystem(topology)) {
errno = EINVAL;
return -1;
}
clret = clGetDeviceInfo(device, CL_DEVICE_TOPOLOGY_AMD, sizeof(amdtopo), &amdtopo, NULL);
if (CL_SUCCESS != clret) {
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
return 0;
}
if (CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD != amdtopo.raw.type) {
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
return 0;
}
sprintf(path, "/sys/bus/pci/devices/0000:%02x:%02x.%01x/local_cpus", amdtopo.pcie.bus, amdtopo.pcie.device, amdtopo.pcie.function);
sysfile = fopen(path, "r");
if (!sysfile)
return -1;
hwloc_linux_parse_cpumap_file(sysfile, set);
if (hwloc_bitmap_iszero(set))
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
fclose(sysfile);
#else
/* Non-Linux + AMD OpenCL systems simply get a full cpuset */
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
#endif
return 0;
}
static inline hwloc_obj_t
hwloc_opencl_get_device_osdev_by_index(hwloc_topology_t topology,
unsigned platform_index, unsigned device_index)
{
unsigned x = (unsigned) -1, y = (unsigned) -1;
hwloc_obj_t osdev = NULL;
while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
&& osdev->name
&& sscanf(osdev->name, "opencl%ud%u", &x, &y) == 2
&& platform_index == x && device_index == y)
return osdev;
}
return NULL;
}
static inline hwloc_obj_t
hwloc_opencl_get_device_osdev(hwloc_topology_t topology ,
cl_device_id device )
{
#ifdef CL_DEVICE_TOPOLOGY_AMD
hwloc_obj_t osdev;
cl_device_topology_amd amdtopo;
cl_int clret;
clret = clGetDeviceInfo(device, CL_DEVICE_TOPOLOGY_AMD, sizeof(amdtopo), &amdtopo, NULL);
if (CL_SUCCESS != clret) {
errno = EINVAL;
return NULL;
}
if (CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD != amdtopo.raw.type) {
errno = EINVAL;
return NULL;
}
osdev = NULL;
while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
hwloc_obj_t pcidev = osdev->parent;
if (strncmp(osdev->name, "opencl", 6))
continue;
if (pcidev
&& pcidev->type == HWLOC_OBJ_PCI_DEVICE
&& pcidev->attr->pcidev.domain == 0
&& pcidev->attr->pcidev.bus == amdtopo.pcie.bus
&& pcidev->attr->pcidev.dev == amdtopo.pcie.device
&& pcidev->attr->pcidev.func == amdtopo.pcie.function)
return osdev;
}
return NULL;
#else
return NULL;
#endif
}
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* HWLOC_OPENCL_H */