Hardware Locality (hwloc): cuda.h Source File

Hardware Locality (hwloc) 2.6.0

cuda.h
1 /*
2 * Copyright © 2010-2021 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
30 extern "C" {
31 #endif
32
33
46 static __hwloc_inline int
47 hwloc_cuda_get_device_pci_ids(hwloc_topology_t topology __hwloc_attribute_unused,
48 CUdevice cudevice, int *domain, int *bus, int *dev)
49 {
50 CUresult cres;
51
52 #if CUDA_VERSION >= 4000
53 cres = cuDeviceGetAttribute(domain, CU_DEVICE_ATTRIBUTE_PCI_DOMAIN_ID, cudevice);
54 if (cres != CUDA_SUCCESS) {
55 errno = ENOSYS;
56 return -1;
57 }
58 #else
59 *domain = 0;
60 #endif
61 cres = cuDeviceGetAttribute(bus, CU_DEVICE_ATTRIBUTE_PCI_BUS_ID, cudevice);
62 if (cres != CUDA_SUCCESS) {
63 errno = ENOSYS;
64 return -1;
65 }
66 cres = cuDeviceGetAttribute(dev, CU_DEVICE_ATTRIBUTE_PCI_DEVICE_ID, cudevice);
67 if (cres != CUDA_SUCCESS) {
68 errno = ENOSYS;
69 return -1;
70 }
71
72 return 0;
73 }
74
91 static __hwloc_inline int
92 hwloc_cuda_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
93 CUdevice cudevice, hwloc_cpuset_t set)
94 {
95 #ifdef HWLOC_LINUX_SYS
96 /* If we're on Linux, use the sysfs mechanism to get the local cpus */
97 #define HWLOC_CUDA_DEVICE_SYSFS_PATH_MAX 128
98 char path[HWLOC_CUDA_DEVICE_SYSFS_PATH_MAX];
99 int domainid, busid, deviceid;
100
101 if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domainid, &busid, &deviceid))
102 return -1;
103
104 if (!hwloc_topology_is_thissystem(topology)) {
105 errno = EINVAL;
106 return -1;
107 }
108
109 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", domainid, busid, deviceid);
110 if (hwloc_linux_read_path_as_cpumask(path, set) < 0
111 || hwloc_bitmap_iszero(set))
112 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
113 #else
114 /* Non-Linux systems simply get a full cpuset */
115 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
116 #endif
117 return 0;
118 }
119
130 static __hwloc_inline hwloc_obj_t
131 hwloc_cuda_get_device_pcidev(hwloc_topology_t topology, CUdevice cudevice)
132 {
133 int domain, bus, dev;
134
135 if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domain, &bus, &dev))
136 return NULL;
137
138 return hwloc_get_pcidev_by_busid(topology, domain, bus, dev, 0);
139 }
140
156 static __hwloc_inline hwloc_obj_t
157 hwloc_cuda_get_device_osdev(hwloc_topology_t topology, CUdevice cudevice)
158 {
159 hwloc_obj_t osdev = NULL;
160 int domain, bus, dev;
161
162 if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domain, &bus, &dev))
163 return NULL;
164
165 osdev = NULL;
166 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
167 hwloc_obj_t pcidev = osdev->parent;
168 if (strncmp(osdev->name, "cuda", 4))
169 continue;
170 if (pcidev
171 && pcidev->type == HWLOC_OBJ_PCI_DEVICE
172 && (int) pcidev->attr->pcidev.domain == domain
173 && (int) pcidev->attr->pcidev.bus == bus
174 && (int) pcidev->attr->pcidev.dev == dev
175 && pcidev->attr->pcidev.func == 0)
176 return osdev;
177 /* if PCI are filtered out, we need a info attr to match on */
178 }
179
180 return NULL;
181 }
182
198 static __hwloc_inline hwloc_obj_t
199 hwloc_cuda_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
200 {
201 hwloc_obj_t osdev = NULL;
202 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
203 if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
204 && osdev->name
205 && !strncmp("cuda", osdev->name, 4)
206 && atoi(osdev->name + 4) == (int) idx)
207 return osdev;
208 }
209 return NULL;
210 }
211
215 #ifdef __cplusplus
216 } /* extern "C" */
217 #endif
218
219
220 #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:140
HWLOC_OBJ_OSDEV_COPROC
@ HWLOC_OBJ_OSDEV_COPROC
Operating system co-processor device. For instance "opencl0d0" for a OpenCL device,...
Definition: hwloc.h:353
HWLOC_OBJ_PCI_DEVICE
@ HWLOC_OBJ_PCI_DEVICE
PCI device (filtered out by default).
Definition: hwloc.h:269
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:692
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:1194
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:1157
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:47
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:131
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:199
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:157
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:92
hwloc_obj
Structure of a topology object.
Definition: hwloc.h:396
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:408
hwloc_obj::type
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:398
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:415
hwloc_obj::parent
struct hwloc_obj * parent
Parent, NULL if root (Machine object)
Definition: hwloc.h:446
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:639
hwloc_obj_attr_u::hwloc_pcidev_attr_s::func
unsigned char func
Definition: hwloc.h:639
hwloc_obj_attr_u::hwloc_pcidev_attr_s::domain
unsigned short domain
Definition: hwloc.h:635
hwloc_obj_attr_u::hwloc_pcidev_attr_s::bus
unsigned char bus
Definition: hwloc.h:639
hwloc_obj_attr_u::hwloc_osdev_attr_s::type
hwloc_obj_osdev_type_t type
Definition: hwloc.h:666