Hardware Locality (hwloc): nvml.h Source File

Hardware Locality (hwloc) 2.9.2

nvml.h
1/*
2 * Copyright © 2012-2023 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
27extern "C" {
28#endif
29
30
58static __hwloc_inline int
59hwloc_nvml_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
60 nvmlDevice_t device, 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_NVML_DEVICE_SYSFS_PATH_MAX 128
65 char path[HWLOC_NVML_DEVICE_SYSFS_PATH_MAX];
66 nvmlReturn_t nvres;
67 nvmlPciInfo_t pci;
68
69 if (!hwloc_topology_is_thissystem(topology)) {
70 errno = EINVAL;
71 return -1;
72 }
73
74 nvres = nvmlDeviceGetPciInfo(device, &pci);
75 if (NVML_SUCCESS != nvres) {
76 errno = EINVAL;
77 return -1;
78 }
79
80 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", pci.domain, pci.bus, pci.device);
81 if (hwloc_linux_read_path_as_cpumask(path, set) < 0
82 || hwloc_bitmap_iszero(set))
83 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
84#else
85 /* Non-Linux systems simply get a full cpuset */
86 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
87#endif
88 return 0;
89}
90
104static __hwloc_inline hwloc_obj_t
105hwloc_nvml_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
106{
107 hwloc_obj_t osdev = NULL;
108 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
109 if (HWLOC_OBJ_OSDEV_GPU == osdev->attr->osdev.type
110 && osdev->name
111 && !strncmp("nvml", osdev->name, 4)
112 && atoi(osdev->name + 4) == (int) idx)
113 return osdev;
114 }
115 return NULL;
116}
117
131static __hwloc_inline hwloc_obj_t
132hwloc_nvml_get_device_osdev(hwloc_topology_t topology, nvmlDevice_t device)
133{
134 hwloc_obj_t osdev;
135 nvmlReturn_t nvres;
136 nvmlPciInfo_t pci;
137 char uuid[64];
138
139 if (!hwloc_topology_is_thissystem(topology)) {
140 errno = EINVAL;
141 return NULL;
142 }
143
144 nvres = nvmlDeviceGetPciInfo(device, &pci);
145 if (NVML_SUCCESS != nvres)
146 return NULL;
147
148 nvres = nvmlDeviceGetUUID(device, uuid, sizeof(uuid));
149 if (NVML_SUCCESS != nvres)
150 uuid[0] = '\0';
151
152 osdev = NULL;
153 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
154 hwloc_obj_t pcidev = osdev->parent;
155 const char *info;
156
157 if (strncmp(osdev->name, "nvml", 4))
158 continue;
159
160 if (pcidev
161 && pcidev->type == HWLOC_OBJ_PCI_DEVICE
162 && pcidev->attr->pcidev.domain == pci.domain
163 && pcidev->attr->pcidev.bus == pci.bus
164 && pcidev->attr->pcidev.dev == pci.device
165 && pcidev->attr->pcidev.func == 0)
166 return osdev;
167
168 info = hwloc_obj_get_info_by_name(osdev, "NVIDIAUUID");
169 if (info && !strcmp(info, uuid))
170 return osdev;
171 }
172
173 return NULL;
174}
175
179#ifdef __cplusplus
180} /* extern "C" */
181#endif
182
183
184#endif /* HWLOC_NVML_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:161
HWLOC_OBJ_OSDEV_GPU
@ 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:363
HWLOC_OBJ_PCI_DEVICE
@ HWLOC_OBJ_PCI_DEVICE
PCI device (filtered out by default).
Definition: hwloc.h:290
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:716
hwloc_obj_get_info_by_name
static const char * hwloc_obj_get_info_by_name(hwloc_obj_t obj, const char *name)
Search the given key name in object infos and return the corresponding value.
hwloc_topology_is_thissystem
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
hwloc_topology_get_complete_cpuset
hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
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:1280
hwloc_bitmap_iszero
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.
hwloc_bitmap_copy
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.
hwloc_linux_read_path_as_cpumask
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.
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 processors that are physically close to NVML device device.
Definition: nvml.h:59
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:105
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:132
hwloc_obj
Structure of a topology object.
Definition: hwloc.h:420
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:432
hwloc_obj::type
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:422
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:439
hwloc_obj::parent
struct hwloc_obj * parent
Parent, NULL if root (Machine object)
Definition: hwloc.h:470
hwloc_obj_attr_u::pcidev
struct hwloc_obj_attr_u::hwloc_pcidev_attr_s pcidev
hwloc_obj_attr_u::osdev
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
hwloc_obj_attr_u::hwloc_pcidev_attr_s::dev
unsigned char dev
Definition: hwloc.h:663
hwloc_obj_attr_u::hwloc_pcidev_attr_s::func
unsigned char func
Definition: hwloc.h:663
hwloc_obj_attr_u::hwloc_pcidev_attr_s::domain
unsigned short domain
Definition: hwloc.h:659
hwloc_obj_attr_u::hwloc_pcidev_attr_s::bus
unsigned char bus
Definition: hwloc.h:663
hwloc_obj_attr_u::hwloc_osdev_attr_s::type
hwloc_obj_osdev_type_t type
Definition: hwloc.h:690