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/*
* Copyright © 2013-2016 Inria. All rights reserved.
* See COPYING in top-level directory.
*/
/** \file
* \brief Macros to help interaction between hwloc and Intel Xeon Phi (MIC).
*
* Applications that use both hwloc and Intel Xeon Phi (MIC) may want to
* include this file so as to get topology information for MIC devices.
*/
#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
/** \defgroup hwlocality_intel_mic Interoperability with Intel Xeon Phi (MIC)
*
* This interface offers ways to retrieve topology information about
* Intel Xeon Phi (MIC) devices.
*
* @{
*/
/** \brief Get the CPU set of logical processors that are physically
* close to MIC device whose index is \p idx.
*
* Return the CPU set describing the locality of the MIC device whose index is \p idx.
*
* Topology \p topology and device index \p idx must match the local machine.
* I/O devices detection is not needed in the topology.
*
* The function only returns the locality of the device.
* If more information about the device is needed, OS objects should
* be used instead, see hwloc_intel_mic_get_device_osdev_by_index().
*
* This function is currently only implemented in a meaningful way for
* Linux; other systems will simply get a full cpuset.
*/
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;
}
/** \brief Get the hwloc OS device object corresponding to the
* MIC device for the given index.
*
* Return the OS device object describing the MIC device whose index is \p idx.
* Return NULL if there is none.
*
* The topology \p topology does not necessarily have to match the current
* machine. For instance the topology may be an XML import of a remote host.
* I/O devices detection must be enabled in the topology.
*
* \note The corresponding PCI device object can be obtained by looking
* at the OS device parent object.
*/
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 */
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