Hardware Locality (hwloc): intel-mic.h Source File

Hardware Locality (hwloc) 1.11.7

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 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 if (hwloc_linux_parse_cpumap_file(sysfile, set) < 0
91 || hwloc_bitmap_iszero(set))
92 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
93
94 fclose(sysfile);
95 break;
96 }
97 }
98
99 closedir(sysdir);
100 #else
101 /* Non-Linux systems simply get a full cpuset */
102 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
103 #endif
104 return 0;
105 }
106
120 static __hwloc_inline hwloc_obj_t
121 hwloc_intel_mic_get_device_osdev_by_index(hwloc_topology_t topology,
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 */
hwloc_cpuset_t
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:125
hwloc_get_next_osdev
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:1252
hwloc_obj::name
char * name
Object-specific name if any. Mostly used for identifying OS devices and Misc objects where a name str...
Definition: hwloc.h:353
hwloc_bitmap_copy
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.
hwloc_obj::attr
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:360
hwloc_topology_is_thissystem
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
HWLOC_OBJ_OSDEV_COPROC
Operating system co-processor device. For instance "mic0" for a Xeon Phi (MIC) on Linux...
Definition: hwloc.h:284
hwloc_obj_attr_u::hwloc_osdev_attr_s::type
hwloc_obj_osdev_type_t type
Definition: hwloc.h:543
hwloc_obj_attr_u::osdev
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
hwloc_intel_mic_get_device_osdev_by_index
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:121
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:609
hwloc_topology_get_complete_cpuset
static hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
Definition: helper.h:803
hwloc_obj
Structure of a topology object.
Definition: hwloc.h:345
hwloc_linux_parse_cpumap_file
int hwloc_linux_parse_cpumap_file(FILE *file, hwloc_cpuset_t set)
Convert a linux kernel cpumap file file into hwloc CPU set.
hwloc_intel_mic_get_device_cpuset
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
hwloc_bitmap_iszero
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.