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 __hwloc_inline int
hwloc_opencl_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
                               cl_device_id device __hwloc_attribute_unused,
                               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 __hwloc_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 __hwloc_inline hwloc_obj_t
hwloc_opencl_get_device_osdev(hwloc_topology_t topology __hwloc_attribute_unused,
                              cl_device_id device __hwloc_attribute_unused)
{
#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 */