Hardware Locality (hwloc): nvml.h Source File

Hardware Locality (hwloc) 1.11.7

nvml.h
1 /*
2 * Copyright © 2012-2016 Inria. All rights reserved.
3 * See COPYING in top-level directory.
4 */
5
13 #ifndef HWLOC_NVML_H
14 #define HWLOC_NVML_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 #endif
22
23 #include <nvml.h>
24
25
26 #ifdef __cplusplus
27 extern "C" {
28 #endif
29
30
55 static __hwloc_inline int
56 hwloc_nvml_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
57 nvmlDevice_t device, hwloc_cpuset_t set)
58 {
59 #ifdef HWLOC_LINUX_SYS
60 /* If we're on Linux, use the sysfs mechanism to get the local cpus */
61 #define HWLOC_NVML_DEVICE_SYSFS_PATH_MAX 128
62 char path[HWLOC_NVML_DEVICE_SYSFS_PATH_MAX];
63 FILE *sysfile = NULL;
64 nvmlReturn_t nvres;
65 nvmlPciInfo_t pci;
66
67 if (!hwloc_topology_is_thissystem(topology)) {
68 errno = EINVAL;
69 return -1;
70 }
71
72 nvres = nvmlDeviceGetPciInfo(device, &pci);
73 if (NVML_SUCCESS != nvres) {
74 errno = EINVAL;
75 return -1;
76 }
77
78 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", pci.domain, pci.bus, pci.device);
79 sysfile = fopen(path, "r");
80 if (!sysfile)
81 return -1;
82
83 if (hwloc_linux_parse_cpumap_file(sysfile, set) < 0
84 || hwloc_bitmap_iszero(set))
85 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
86
87 fclose(sysfile);
88 #else
89 /* Non-Linux systems simply get a full cpuset */
90 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
91 #endif
92 return 0;
93 }
94
108 static __hwloc_inline hwloc_obj_t
109 hwloc_nvml_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
110 {
111 hwloc_obj_t osdev = NULL;
112 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
113 if (HWLOC_OBJ_OSDEV_GPU == osdev->attr->osdev.type
114 && osdev->name
115 && !strncmp("nvml", osdev->name, 4)
116 && atoi(osdev->name + 4) == (int) idx)
117 return osdev;
118 }
119 return NULL;
120 }
121
135 static __hwloc_inline hwloc_obj_t
136 hwloc_nvml_get_device_osdev(hwloc_topology_t topology, nvmlDevice_t device)
137 {
138 hwloc_obj_t osdev;
139 nvmlReturn_t nvres;
140 nvmlPciInfo_t pci;
141
142 if (!hwloc_topology_is_thissystem(topology)) {
143 errno = EINVAL;
144 return NULL;
145 }
146
147 nvres = nvmlDeviceGetPciInfo(device, &pci);
148 if (NVML_SUCCESS != nvres)
149 return NULL;
150
151 osdev = NULL;
152 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
153 hwloc_obj_t pcidev = osdev->parent;
154 if (strncmp(osdev->name, "nvml", 4))
155 continue;
156 if (pcidev
157 && pcidev->type == HWLOC_OBJ_PCI_DEVICE
158 && pcidev->attr->pcidev.domain == pci.domain
159 && pcidev->attr->pcidev.bus == pci.bus
160 && pcidev->attr->pcidev.dev == pci.device
161 && pcidev->attr->pcidev.func == 0)
162 return osdev;
163 }
164
165 return NULL;
166 }
167
171 #ifdef __cplusplus
172 } /* extern "C" */
173 #endif
174
175
176 #endif /* HWLOC_NVML_H */
hwloc_obj_attr_u::hwloc_pcidev_attr_s::domain
unsigned short domain
Definition: hwloc.h:519
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_nvml_get_device_osdev
static hwloc_obj_t hwloc_nvml_get_device_osdev(hwloc_topology_t topology, nvmlDevice_t device)
Get the hwloc OS device object corresponding to NVML device device.
Definition: nvml.h:136
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_obj_attr_u::pcidev
struct hwloc_obj_attr_u::hwloc_pcidev_attr_s pcidev
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_attr_u::hwloc_pcidev_attr_s::bus
unsigned char bus
Definition: hwloc.h:520
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_nvml_get_device_osdev_by_index
static hwloc_obj_t hwloc_nvml_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
Get the hwloc OS device object corresponding to the NVML device whose index is idx.
Definition: nvml.h:109
hwloc_nvml_get_device_cpuset
static int hwloc_nvml_get_device_cpuset(hwloc_topology_t topology, nvmlDevice_t device, hwloc_cpuset_t set)
Get the CPU set of logical processors that are physically close to NVML device device.
Definition: nvml.h:56
hwloc_obj::type
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:347
hwloc_obj_attr_u::hwloc_pcidev_attr_s::func
unsigned char func
Definition: hwloc.h:520
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:609
hwloc_obj_attr_u::hwloc_pcidev_attr_s::dev
unsigned char dev
Definition: hwloc.h:520
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_obj::parent
struct hwloc_obj * parent
Parent, NULL if root (system object)
Definition: hwloc.h:380
HWLOC_OBJ_OSDEV_GPU
Operating system GPU device. For instance ":0.0" for a GL display, "card0" for a Linux DRM device...
Definition: hwloc.h:274
HWLOC_OBJ_PCI_DEVICE
PCI device. These objects have neither CPU sets nor node sets. They are not added to the topology unl...
Definition: hwloc.h:233
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_bitmap_iszero
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.