Hardware Locality (hwloc) 1.11.9

cuda.h
1 /*
2 * Copyright © 2010-2017 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 FILE *sysfile = NULL;
100 int domainid, busid, deviceid;
101
102 if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domainid, &busid, &deviceid))
103 return -1;
104
105 if (!hwloc_topology_is_thissystem(topology)) {
106 errno = EINVAL;
107 return -1;
108 }
109
110 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", domainid, busid, deviceid);
111 sysfile = fopen(path, "r");
112 if (!sysfile)
113 return -1;
114
115 if (hwloc_linux_parse_cpumap_file(sysfile, set) < 0
116 || hwloc_bitmap_iszero(set))
117 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
118
119 fclose(sysfile);
120 #else
121 /* Non-Linux systems simply get a full cpuset */
122 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
123 #endif
124 return 0;
125 }
126
137 static __hwloc_inline hwloc_obj_t
138 hwloc_cuda_get_device_pcidev(hwloc_topology_t topology, CUdevice cudevice)
139 {
140 int domain, bus, dev;
141
142 if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domain, &bus, &dev))
143 return NULL;
144
145 return hwloc_get_pcidev_by_busid(topology, domain, bus, dev, 0);
146 }
147
161 static __hwloc_inline hwloc_obj_t
162 hwloc_cuda_get_device_osdev(hwloc_topology_t topology, CUdevice cudevice)
163 {
164 hwloc_obj_t osdev = NULL;
165 int domain, bus, dev;
166
167 if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domain, &bus, &dev))
168 return NULL;
169
170 osdev = NULL;
171 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
172 hwloc_obj_t pcidev = osdev->parent;
173 if (strncmp(osdev->name, "cuda", 4))
174 continue;
175 if (pcidev
176 && pcidev->type == HWLOC_OBJ_PCI_DEVICE
177 && (int) pcidev->attr->pcidev.domain == domain
178 && (int) pcidev->attr->pcidev.bus == bus
179 && (int) pcidev->attr->pcidev.dev == dev
180 && pcidev->attr->pcidev.func == 0)
181 return osdev;
182 }
183
184 return NULL;
185 }
186
202 static __hwloc_inline hwloc_obj_t
203 hwloc_cuda_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
204 {
205 hwloc_obj_t osdev = NULL;
206 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
207 if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
208 && osdev->name
209 && !strncmp("cuda", osdev->name, 4)
210 && atoi(osdev->name + 4) == (int) idx)
211 return osdev;
212 }
213 return NULL;
214 }
215
219 #ifdef __cplusplus
220 } /* extern "C" */
221 #endif
222
223
224 #endif /* HWLOC_CUDA_H */
hwloc_obj_attr_u::hwloc_pcidev_attr_s::domain
unsigned short domain
Definition: hwloc.h:542
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:132
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:1252
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 logical processors that are physically close to device cudevice.
Definition: cuda.h:92
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_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:366
hwloc_obj_attr_u::pcidev
struct hwloc_obj_attr_u::hwloc_pcidev_attr_s pcidev
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_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:203
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:373
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:162
hwloc_topology_is_thissystem
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
HWLOC_OBJ_OSDEV_COPROC
Operating system co-processor device. For instance "mic0" for a Xeon Phi (MIC) on Linux...
Definition: hwloc.h:297
hwloc_obj_attr_u::hwloc_pcidev_attr_s::bus
unsigned char bus
Definition: hwloc.h:543
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:1215
hwloc_obj_attr_u::hwloc_osdev_attr_s::type
hwloc_obj_osdev_type_t type
Definition: hwloc.h:566
hwloc_obj_attr_u::osdev
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
hwloc_obj::type
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:360
hwloc_obj_attr_u::hwloc_pcidev_attr_s::func
unsigned char func
Definition: hwloc.h:543
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:632
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:138
hwloc_obj_attr_u::hwloc_pcidev_attr_s::dev
unsigned char dev
Definition: hwloc.h:543
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:803
hwloc_obj
Structure of a topology object.
Definition: hwloc.h:358
hwloc_obj::parent
struct hwloc_obj * parent
Parent, NULL if root (system object)
Definition: hwloc.h:403
HWLOC_OBJ_PCI_DEVICE
PCI device. These objects have neither CPU sets nor node sets. They are not added to the topology unl...
Definition: hwloc.h:246
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_bitmap_iszero
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.