Hardware Locality (hwloc): cuda.h Source File

Hardware Locality (hwloc) 2.9.2

cuda.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_CUDA_H
17#define HWLOC_CUDA_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>
27
28
29#ifdef __cplusplus
30extern "C" {
31#endif
32
33
49static __hwloc_inline int
50hwloc_cuda_get_device_pci_ids(hwloc_topology_t topology __hwloc_attribute_unused,
51 CUdevice cudevice, int *domain, int *bus, int *dev)
52{
53 CUresult cres;
54
55#if CUDA_VERSION >= 4000
56 cres = cuDeviceGetAttribute(domain, CU_DEVICE_ATTRIBUTE_PCI_DOMAIN_ID, cudevice);
57 if (cres != CUDA_SUCCESS) {
58 errno = ENOSYS;
59 return -1;
60 }
61#else
62 *domain = 0;
63#endif
64 cres = cuDeviceGetAttribute(bus, CU_DEVICE_ATTRIBUTE_PCI_BUS_ID, cudevice);
65 if (cres != CUDA_SUCCESS) {
66 errno = ENOSYS;
67 return -1;
68 }
69 cres = cuDeviceGetAttribute(dev, CU_DEVICE_ATTRIBUTE_PCI_DEVICE_ID, cudevice);
70 if (cres != CUDA_SUCCESS) {
71 errno = ENOSYS;
72 return -1;
73 }
74
75 return 0;
76}
77
97static __hwloc_inline int
98hwloc_cuda_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
99 CUdevice cudevice, hwloc_cpuset_t set)
100{
101#ifdef HWLOC_LINUX_SYS
102 /* If we're on Linux, use the sysfs mechanism to get the local cpus */
103#define HWLOC_CUDA_DEVICE_SYSFS_PATH_MAX 128
104 char path[HWLOC_CUDA_DEVICE_SYSFS_PATH_MAX];
105 int domainid, busid, deviceid;
106
107 if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domainid, &busid, &deviceid))
108 return -1;
109
110 if (!hwloc_topology_is_thissystem(topology)) {
111 errno = EINVAL;
112 return -1;
113 }
114
115 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", domainid, busid, deviceid);
116 if (hwloc_linux_read_path_as_cpumask(path, set) < 0
117 || hwloc_bitmap_iszero(set))
118 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
119#else
120 /* Non-Linux systems simply get a full cpuset */
121 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
122#endif
123 return 0;
124}
125
136static __hwloc_inline hwloc_obj_t
137hwloc_cuda_get_device_pcidev(hwloc_topology_t topology, CUdevice cudevice)
138{
139 int domain, bus, dev;
140
141 if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domain, &bus, &dev))
142 return NULL;
143
144 return hwloc_get_pcidev_by_busid(topology, domain, bus, dev, 0);
145}
146
162static __hwloc_inline hwloc_obj_t
163hwloc_cuda_get_device_osdev(hwloc_topology_t topology, CUdevice cudevice)
164{
165 hwloc_obj_t osdev = NULL;
166 int domain, bus, dev;
167
168 if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domain, &bus, &dev))
169 return NULL;
170
171 osdev = NULL;
172 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
173 hwloc_obj_t pcidev = osdev->parent;
174 if (strncmp(osdev->name, "cuda", 4))
175 continue;
176 if (pcidev
177 && pcidev->type == HWLOC_OBJ_PCI_DEVICE
178 && (int) pcidev->attr->pcidev.domain == domain
179 && (int) pcidev->attr->pcidev.bus == bus
180 && (int) pcidev->attr->pcidev.dev == dev
181 && pcidev->attr->pcidev.func == 0)
182 return osdev;
183 /* if PCI are filtered out, we need a info attr to match on */
184 }
185
186 return NULL;
187}
188
204static __hwloc_inline hwloc_obj_t
205hwloc_cuda_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
206{
207 hwloc_obj_t osdev = NULL;
208 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
209 if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
210 && osdev->name
211 && !strncmp("cuda", osdev->name, 4)
212 && atoi(osdev->name + 4) == (int) idx)
213 return osdev;
214 }
215 return NULL;
216}
217
221#ifdef __cplusplus
222} /* extern "C" */
223#endif
224
225
226#endif /* HWLOC_CUDA_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_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_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_cuda_get_device_pci_ids
static int hwloc_cuda_get_device_pci_ids(hwloc_topology_t topology, CUdevice cudevice, int *domain, int *bus, int *dev)
Return the domain, bus and device IDs of the CUDA device cudevice.
Definition: cuda.h:50
hwloc_cuda_get_device_pcidev
static hwloc_obj_t hwloc_cuda_get_device_pcidev(hwloc_topology_t topology, CUdevice cudevice)
Get the hwloc PCI device object corresponding to the CUDA device cudevice.
Definition: cuda.h:137
hwloc_cuda_get_device_osdev_by_index
static hwloc_obj_t hwloc_cuda_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: cuda.h:205
hwloc_cuda_get_device_osdev
static hwloc_obj_t hwloc_cuda_get_device_osdev(hwloc_topology_t topology, CUdevice cudevice)
Get the hwloc OS device object corresponding to CUDA device cudevice.
Definition: cuda.h:163
hwloc_cuda_get_device_cpuset
static int hwloc_cuda_get_device_cpuset(hwloc_topology_t topology, CUdevice cudevice, hwloc_cpuset_t set)
Get the CPU set of processors that are physically close to device cudevice.
Definition: cuda.h:98
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