Hardware Locality (hwloc): cudart.h Source File

Hardware Locality (hwloc) 2.9.3

cudart.h
1/*
2 * Copyright © 2010-2023 Inria. All rights reserved.
3 * Copyright © 2010-2011 Université Bordeaux
4 * Copyright © 2011 Cisco Systems, Inc. All rights reserved.
5 * See COPYING in top-level directory.
6 */
7
16#ifndef HWLOC_CUDART_H
17#define HWLOC_CUDART_H
18
19#include "hwloc.h"
20#include "hwloc/autogen/config.h"
21#include "hwloc/helper.h"
22#ifdef HWLOC_LINUX_SYS
23#include "hwloc/linux.h"
24#endif
25
26#include <cuda.h> /* for CUDA_VERSION */
27#include <cuda_runtime_api.h>
28
29
30#ifdef __cplusplus
31extern "C" {
32#endif
33
34
50static __hwloc_inline int
51hwloc_cudart_get_device_pci_ids(hwloc_topology_t topology __hwloc_attribute_unused,
52 int idx, int *domain, int *bus, int *dev)
53{
54 cudaError_t cerr;
55 struct cudaDeviceProp prop;
56
57 cerr = cudaGetDeviceProperties(&prop, idx);
58 if (cerr) {
59 errno = ENOSYS;
60 return -1;
61 }
62
63#if CUDA_VERSION >= 4000
64 *domain = prop.pciDomainID;
65#else
66 *domain = 0;
67#endif
68
69 *bus = prop.pciBusID;
70 *dev = prop.pciDeviceID;
71
72 return 0;
73}
74
94static __hwloc_inline int
95hwloc_cudart_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
96 int idx, hwloc_cpuset_t set)
97{
98#ifdef HWLOC_LINUX_SYS
99 /* If we're on Linux, use the sysfs mechanism to get the local cpus */
100#define HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX 128
101 char path[HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX];
102 int domain, bus, dev;
103
104 if (hwloc_cudart_get_device_pci_ids(topology, idx, &domain, &bus, &dev))
105 return -1;
106
107 if (!hwloc_topology_is_thissystem(topology)) {
108 errno = EINVAL;
109 return -1;
110 }
111
112 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", (unsigned) domain, (unsigned) bus, (unsigned) dev);
113 if (hwloc_linux_read_path_as_cpumask(path, set) < 0
114 || hwloc_bitmap_iszero(set))
115 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
116#else
117 /* Non-Linux systems simply get a full cpuset */
118 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
119#endif
120 return 0;
121}
122
133static __hwloc_inline hwloc_obj_t
134hwloc_cudart_get_device_pcidev(hwloc_topology_t topology, int idx)
135{
136 int domain, bus, dev;
137
138 if (hwloc_cudart_get_device_pci_ids(topology, idx, &domain, &bus, &dev))
139 return NULL;
140
141 return hwloc_get_pcidev_by_busid(topology, domain, bus, dev, 0);
142}
143
161static __hwloc_inline hwloc_obj_t
162hwloc_cudart_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
163{
164 hwloc_obj_t osdev = NULL;
165 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
166 if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
167 && osdev->name
168 && !strncmp("cuda", osdev->name, 4)
169 && atoi(osdev->name + 4) == (int) idx)
170 return osdev;
171 }
172 return NULL;
173}
174
178#ifdef __cplusplus
179} /* extern "C" */
180#endif
181
182
183#endif /* HWLOC_CUDART_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_COPROC
@ HWLOC_OBJ_OSDEV_COPROC
Operating system co-processor device. For instance "opencl0d0" for a OpenCL device,...
Definition: hwloc.h:374
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:716
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_get_pcidev_by_busid
static hwloc_obj_t hwloc_get_pcidev_by_busid(hwloc_topology_t topology, unsigned domain, unsigned bus, unsigned dev, unsigned func)
Find the PCI device object matching the PCI bus id given domain, bus device and function PCI bus id.
Definition: helper.h:1239
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_cudart_get_device_cpuset
static int hwloc_cudart_get_device_cpuset(hwloc_topology_t topology, int idx, hwloc_cpuset_t set)
Get the CPU set of processors that are physically close to device idx.
Definition: cudart.h:95
hwloc_cudart_get_device_osdev_by_index
static hwloc_obj_t hwloc_cudart_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
Get the hwloc OS device object corresponding to the CUDA device whose index is idx.
Definition: cudart.h:162
hwloc_cudart_get_device_pci_ids
static int hwloc_cudart_get_device_pci_ids(hwloc_topology_t topology, int idx, int *domain, int *bus, int *dev)
Return the domain, bus and device IDs of the CUDA device whose index is idx.
Definition: cudart.h:51
hwloc_cudart_get_device_pcidev
static hwloc_obj_t hwloc_cudart_get_device_pcidev(hwloc_topology_t topology, int idx)
Get the hwloc PCI device object corresponding to the CUDA device whose index is idx.
Definition: cudart.h:134
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::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_attr_u::osdev
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
hwloc_obj_attr_u::hwloc_osdev_attr_s::type
hwloc_obj_osdev_type_t type
Definition: hwloc.h:690