intel-mic.h

/*
 * Copyright © 2013-2016 Inria.  All rights reserved.
 * See COPYING in top-level directory.
 */

#ifndef HWLOC_INTEL_MIC_H
#define HWLOC_INTEL_MIC_H

#include "hwloc.h"
#include "hwloc/autogen/config.h"
#include "hwloc/helper.h"

#ifdef HWLOC_LINUX_SYS
#include "hwloc/linux.h"

#include <dirent.h>
#include <string.h>
#endif

#include <stdio.h>
#include <stdlib.h>


#ifdef __cplusplus
extern "C" {
#endif


static __hwloc_inline int
hwloc_intel_mic_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
                                  int idx __hwloc_attribute_unused,
                                  hwloc_cpuset_t set)
{
#ifdef HWLOC_LINUX_SYS
        /* If we're on Linux, use the sysfs mechanism to get the local cpus */
#define HWLOC_INTEL_MIC_DEVICE_SYSFS_PATH_MAX 128
        char path[HWLOC_INTEL_MIC_DEVICE_SYSFS_PATH_MAX];
        DIR *sysdir = NULL;
        struct dirent *dirent;
        unsigned pcibus, pcidev, pcifunc;

        if (!hwloc_topology_is_thissystem(topology)) {
                errno = EINVAL;
                return -1;
        }

        sprintf(path, "/sys/class/mic/mic%d", idx);
        sysdir = opendir(path);
        if (!sysdir)
                return -1;

        while ((dirent = readdir(sysdir)) != NULL) {
                if (sscanf(dirent->d_name, "pci_%02x:%02x.%02x", &pcibus, &pcidev, &pcifunc) == 3) {
                        sprintf(path, "/sys/class/mic/mic%d/pci_%02x:%02x.%02x/local_cpus", idx, pcibus, pcidev, pcifunc);
                        if (hwloc_linux_read_path_as_cpumask(path, set) < 0
                            || hwloc_bitmap_iszero(set))
                                hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
                        break;
                }
        }

        closedir(sysdir);
#else
        /* Non-Linux 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_intel_mic_get_device_osdev_by_index(hwloc_topology_t topology,
                                          unsigned idx)
{
        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
                    && !strncmp("mic", osdev->name, 3)
                    && atoi(osdev->name + 3) == (int) idx)
                        return osdev;
        }
        return NULL;
}

#ifdef __cplusplus
} /* extern "C" */
#endif


#endif /* HWLOC_INTEL_MIC_H */