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Portable Hardware Locality (hwloc) Documentation: v1.8

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cuda.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_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 #ifdef CU_DEVICE_ATTRIBUTE_PCI_DOMAIN_ID
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  hwloc_linux_parse_cpumap_file(sysfile, set);
116  if (hwloc_bitmap_iszero(set))
118 
119  fclose(sysfile);
120 #else
121  /* Non-Linux systems simply get a full cpuset */
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
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 */
static __hwloc_inline 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_DECLSPEC int hwloc_topology_is_thissystem(hwloc_topology_t __hwloc_restrict topology) __hwloc_attribute_pure
Does the topology context come from this system?
static __hwloc_inline int hwloc_cuda_get_device_pci_ids(hwloc_topology_t topology __hwloc_attribute_unused, CUdevice cudevice, int *domain, int *bus, int *dev)
Return the domain, bus and device IDs of the CUDA device cudevice.
Definition: cuda.h:47
static __hwloc_inline 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_DECLSPEC int hwloc_linux_parse_cpumap_file(FILE *file, hwloc_cpuset_t set)
Convert a linux kernel cpumap file file into hwloc CPU set.
Operating system co-processor device. For instance &quot;mic0&quot; for a Xeon Phi (MIC) on Linux...
Definition: hwloc.h:270
struct hwloc_obj * parent
Parent, NULL if root (system object)
Definition: hwloc.h:357
static __hwloc_inline int hwloc_cuda_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused, CUdevice cudevice, hwloc_cpuset_t set)
Get the CPU set of logical processors that are physically close to device cudevice.
Definition: cuda.h:92
Structure of a topology object.
Definition: hwloc.h:331
HWLOC_DECLSPEC 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.
static __hwloc_inline hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology) __hwloc_attribute_pure
Get complete CPU set.
Definition: helper.h:726
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
static __hwloc_inline 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_osdev_type_t type
Definition: hwloc.h:520
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:333
char * name
Object description if any.
Definition: hwloc.h:335
static __hwloc_inline 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:1175
unsigned short domain
Definition: hwloc.h:496
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:339
struct hwloc_obj_attr_u::hwloc_pcidev_attr_s pcidev
static __hwloc_inline 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:1138
HWLOC_DECLSPEC int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap) __hwloc_attribute_pure
Test whether bitmap bitmap is empty.
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:577
PCI device. These objects have neither CPU sets nor node sets. They are not added to the topology unl...
Definition: hwloc.h:220
unsigned char bus
Definition: hwloc.h:497
unsigned char func
Definition: hwloc.h:497
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
unsigned char dev
Definition: hwloc.h:497