Hardware Locality (hwloc): cudart.h Source File

Hardware Locality (hwloc) 1.9

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cudart.h
1 /*
2 * Copyright © 2010-2013 Inria. All rights reserved.
3 * Copyright © 2010-2011 Université Bordeaux 1
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_runtime_api.h>
27
28
29 #ifdef __cplusplus
30 extern "C" {
31 #endif
32
33
46 static __hwloc_inline int
47 hwloc_cudart_get_device_pci_ids(hwloc_topology_t topology __hwloc_attribute_unused,
48 int idx, int *domain, int *bus, int *dev)
49 {
50 cudaError_t cerr;
51 struct cudaDeviceProp prop;
52
53 cerr = cudaGetDeviceProperties(&prop, idx);
54 if (cerr) {
55 errno = ENOSYS;
56 return -1;
57 }
58
59 #ifdef CU_DEVICE_ATTRIBUTE_PCI_DOMAIN_ID
60 *domain = prop.pciDomainID;
61 #else
62 *domain = 0;
63 #endif
64
65 *bus = prop.pciBusID;
66 *dev = prop.pciDeviceID;
67
68 return 0;
69 }
70
87 static __hwloc_inline int
88 hwloc_cudart_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
89 int idx, hwloc_cpuset_t set)
90 {
91 #ifdef HWLOC_LINUX_SYS
92 /* If we're on Linux, use the sysfs mechanism to get the local cpus */
93 #define HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX 128
94 char path[HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX];
95 FILE *sysfile = NULL;
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", domain, bus, dev);
107 sysfile = fopen(path, "r");
108 if (!sysfile)
109 return -1;
110
111 hwloc_linux_parse_cpumap_file(sysfile, set);
112 if (hwloc_bitmap_iszero(set))
113 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
114
115 fclose(sysfile);
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
133 static __hwloc_inline hwloc_obj_t
134 hwloc_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
161 static __hwloc_inline hwloc_obj_t
162 hwloc_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_obj_attr_u::hwloc_osdev_attr_s::type
hwloc_obj_osdev_type_t type
Definition: hwloc.h:520
hwloc_bitmap_copy
void 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_topology_is_thissystem
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
hwloc_bitmap_iszero
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.
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:47
hwloc_linux_parse_cpumap_file
int hwloc_linux_parse_cpumap_file(FILE *file, hwloc_cpuset_t set)
Convert a linux kernel cpumap file file into hwloc CPU set.
hwloc_obj::name
char * name
Object description if any.
Definition: hwloc.h:335
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:339
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 logical processors that are physically close to device idx.
Definition: cudart.h:88
HWLOC_OBJ_OSDEV_COPROC
Operating system co-processor device. For instance "mic0" for a Xeon Phi (MIC) on Linux...
Definition: hwloc.h:270
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:1190
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_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:116
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_topology_get_complete_cpuset
static hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
Definition: helper.h:741
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:577
hwloc_obj_attr_u::osdev
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
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:1153
hwloc_obj
Structure of a topology object.
Definition: hwloc.h:331