Hardware Locality (hwloc): cudart.h Source File

Hardware Locality (hwloc) 2.6.0

cudart.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_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
31 extern "C" {
32 #endif
33
34
47 static __hwloc_inline int
48 hwloc_cudart_get_device_pci_ids(hwloc_topology_t topology __hwloc_attribute_unused,
49 int idx, int *domain, int *bus, int *dev)
50 {
51 cudaError_t cerr;
52 struct cudaDeviceProp prop;
53
54 cerr = cudaGetDeviceProperties(&prop, idx);
55 if (cerr) {
56 errno = ENOSYS;
57 return -1;
58 }
59
60 #if CUDA_VERSION >= 4000
61 *domain = prop.pciDomainID;
62 #else
63 *domain = 0;
64 #endif
65
66 *bus = prop.pciBusID;
67 *dev = prop.pciDeviceID;
68
69 return 0;
70 }
71
88 static __hwloc_inline int
89 hwloc_cudart_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
90 int idx, hwloc_cpuset_t set)
91 {
92 #ifdef HWLOC_LINUX_SYS
93 /* If we're on Linux, use the sysfs mechanism to get the local cpus */
94 #define HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX 128
95 char path[HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX];
96 int domain, bus, dev;
97
98 if (hwloc_cudart_get_device_pci_ids(topology, idx, &domain, &bus, &dev))
99 return -1;
100
101 if (!hwloc_topology_is_thissystem(topology)) {
102 errno = EINVAL;
103 return -1;
104 }
105
106 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", (unsigned) domain, (unsigned) bus, (unsigned) dev);
107 if (hwloc_linux_read_path_as_cpumask(path, set) < 0
108 || hwloc_bitmap_iszero(set))
109 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
110 #else
111 /* Non-Linux systems simply get a full cpuset */
112 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
113 #endif
114 return 0;
115 }
116
127 static __hwloc_inline hwloc_obj_t
128 hwloc_cudart_get_device_pcidev(hwloc_topology_t topology, int idx)
129 {
130 int domain, bus, dev;
131
132 if (hwloc_cudart_get_device_pci_ids(topology, idx, &domain, &bus, &dev))
133 return NULL;
134
135 return hwloc_get_pcidev_by_busid(topology, domain, bus, dev, 0);
136 }
137
155 static __hwloc_inline hwloc_obj_t
156 hwloc_cudart_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
157 {
158 hwloc_obj_t osdev = NULL;
159 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
160 if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
161 && osdev->name
162 && !strncmp("cuda", osdev->name, 4)
163 && atoi(osdev->name + 4) == (int) idx)
164 return osdev;
165 }
166 return NULL;
167 }
168
172 #ifdef __cplusplus
173 } /* extern "C" */
174 #endif
175
176
177 #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: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_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_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:89
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:156
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:48
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:128
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::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_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:666