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Portable Hardware Locality (hwloc) Documentation: v1.8

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intel-mic.h
1 /*
2  * Copyright © 2013 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  FILE *sysfile = NULL;
68  struct dirent *dirent;
69  unsigned pcibus, pcidev, pcifunc;
70 
71  if (!hwloc_topology_is_thissystem(topology)) {
72  errno = EINVAL;
73  return -1;
74  }
75 
76  sprintf(path, "/sys/class/mic/mic%d", idx);
77  sysdir = opendir(path);
78  if (!sysdir)
79  return -1;
80 
81  while ((dirent = readdir(sysdir)) != NULL) {
82  if (sscanf(dirent->d_name, "pci_%02x:%02x.%02x", &pcibus, &pcidev, &pcifunc) == 3) {
83  sprintf(path, "/sys/class/mic/mic%d/pci_%02x:%02x.%02x/local_cpus", idx, pcibus, pcidev, pcifunc);
84  sysfile = fopen(path, "r");
85  if (!sysfile) {
86  closedir(sysdir);
87  return -1;
88  }
89 
90  hwloc_linux_parse_cpumap_file(sysfile, set);
91  if (hwloc_bitmap_iszero(set))
93 
94  fclose(sysfile);
95  break;
96  }
97  }
98 
99  closedir(sysdir);
100 #else
101  /* Non-Linux systems simply get a full cpuset */
103 #endif
104  return 0;
105 }
106 
120 static __hwloc_inline hwloc_obj_t
122  unsigned idx)
123 {
124  hwloc_obj_t osdev = NULL;
125  while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
126  if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
127  && osdev->name
128  && !strncmp("mic", osdev->name, 3)
129  && atoi(osdev->name + 3) == (int) idx)
130  return osdev;
131  }
132  return NULL;
133 }
134 
138 #ifdef __cplusplus
139 } /* extern "C" */
140 #endif
141 
142 
143 #endif /* HWLOC_INTEL_MIC_H */
static __hwloc_inline 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:121
HWLOC_DECLSPEC int hwloc_topology_is_thissystem(hwloc_topology_t __hwloc_restrict topology) __hwloc_attribute_pure
Does the topology context come from this system?
HWLOC_DECLSPEC int hwloc_linux_parse_cpumap_file(FILE *file, hwloc_cpuset_t set)
Convert a linux kernel cpumap file file into hwloc CPU set.
Operating system co-processor device. For instance &quot;mic0&quot; for a Xeon Phi (MIC) on Linux...
Definition: hwloc.h:270
Structure of a topology object.
Definition: hwloc.h:331
HWLOC_DECLSPEC void hwloc_bitmap_copy(hwloc_bitmap_t dst, hwloc_const_bitmap_t src)
Copy the contents of bitmap src into the already allocated bitmap dst.
static __hwloc_inline hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology) __hwloc_attribute_pure
Get complete CPU set.
Definition: helper.h:726
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
hwloc_obj_osdev_type_t type
Definition: hwloc.h:520
char * name
Object description if any.
Definition: hwloc.h:335
static __hwloc_inline 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:1175
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:339
HWLOC_DECLSPEC int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap) __hwloc_attribute_pure
Test whether bitmap bitmap is empty.
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:577
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)
Get the CPU set of logical processors that are physically close to MIC device whose index is idx...
Definition: intel-mic.h:58
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:116