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Portable Hardware Locality (hwloc) Documentation: v2.0.3

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intel-mic.h
1 /*
2  * Copyright © 2013-2016 Inria. All rights reserved.
3  * See COPYING in top-level directory.
4  */
5 
13 #ifndef HWLOC_INTEL_MIC_H
14 #define HWLOC_INTEL_MIC_H
15 
16 #include <hwloc.h>
17 #include <hwloc/autogen/config.h>
18 #include <hwloc/helper.h>
19 #ifdef HWLOC_LINUX_SYS
20 #include <hwloc/linux.h>
21 #include <dirent.h>
22 #include <string.h>
23 #endif
24 
25 #include <stdio.h>
26 #include <stdlib.h>
27 
28 
29 #ifdef __cplusplus
30 extern "C" {
31 #endif
32 
33 
57 static __hwloc_inline int
58 hwloc_intel_mic_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
59  int idx __hwloc_attribute_unused,
60  hwloc_cpuset_t set)
61 {
62 #ifdef HWLOC_LINUX_SYS
63  /* If we're on Linux, use the sysfs mechanism to get the local cpus */
64 #define HWLOC_INTEL_MIC_DEVICE_SYSFS_PATH_MAX 128
65  char path[HWLOC_INTEL_MIC_DEVICE_SYSFS_PATH_MAX];
66  DIR *sysdir = NULL;
67  struct dirent *dirent;
68  unsigned pcibus, pcidev, pcifunc;
69 
70  if (!hwloc_topology_is_thissystem(topology)) {
71  errno = EINVAL;
72  return -1;
73  }
74 
75  sprintf(path, "/sys/class/mic/mic%d", idx);
76  sysdir = opendir(path);
77  if (!sysdir)
78  return -1;
79 
80  while ((dirent = readdir(sysdir)) != NULL) {
81  if (sscanf(dirent->d_name, "pci_%02x:%02x.%02x", &pcibus, &pcidev, &pcifunc) == 3) {
82  sprintf(path, "/sys/class/mic/mic%d/pci_%02x:%02x.%02x/local_cpus", idx, pcibus, pcidev, pcifunc);
83  if (hwloc_linux_read_path_as_cpumask(path, set) < 0
84  || hwloc_bitmap_iszero(set))
86  break;
87  }
88  }
89 
90  closedir(sysdir);
91 #else
92  /* Non-Linux systems simply get a full cpuset */
94 #endif
95  return 0;
96 }
97 
111 static __hwloc_inline hwloc_obj_t
113  unsigned idx)
114 {
115  hwloc_obj_t osdev = NULL;
116  while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
117  if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
118  && osdev->name
119  && !strncmp("mic", osdev->name, 3)
120  && atoi(osdev->name + 3) == (int) idx)
121  return osdev;
122  }
123  return NULL;
124 }
125 
129 #ifdef __cplusplus
130 } /* extern "C" */
131 #endif
132 
133 
134 #endif /* HWLOC_INTEL_MIC_H */
hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
int hwloc_linux_read_path_as_cpumask(const char *path, hwloc_bitmap_t set)
Convert a linux kernel cpumask file path into a hwloc bitmap set.
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:636
static hwloc_obj_t hwloc_get_next_osdev(hwloc_topology_t topology, hwloc_obj_t prev)
Get the next OS device in the system.
Definition: helper.h:1123
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
char * name
Object-specific name if any. Mostly used for identifying OS devices and Misc objects where a name str...
Definition: hwloc.h:369
hwloc_obj_osdev_type_t type
Definition: hwloc.h:610
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:376
Structure of a topology object.
Definition: hwloc.h:357
static hwloc_obj_t hwloc_intel_mic_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
Get the hwloc OS device object corresponding to the MIC device for the given index.
Definition: intel-mic.h:112
hwloc_bitmap_t hwloc_cpuset_t
A CPU set is a bitmap whose bits are set according to CPU physical OS indexes.
Definition: hwloc.h:139
Operating system co-processor device. For instance "mic0" for a Xeon Phi (MIC) on Linux...
Definition: hwloc.h:312
static int hwloc_intel_mic_get_device_cpuset(hwloc_topology_t topology, int idx, hwloc_cpuset_t set)
Get the CPU set of logical processors that are physically close to MIC device whose index is idx...
Definition: intel-mic.h:58
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
int hwloc_bitmap_copy(hwloc_bitmap_t dst, hwloc_const_bitmap_t src)
Copy the contents of bitmap src into the already allocated bitmap dst.
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.