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Portable Hardware Locality (hwloc) Documentation: v1.8

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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))
114 
115  fclose(sysfile);
116 #else
117  /* Non-Linux systems simply get a full cpuset */
119 #endif
120  return 0;
121 }
122 
133 static __hwloc_inline hwloc_obj_t
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
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_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_cudart_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused, 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_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
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_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
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
hwloc_obj_osdev_type_t type
Definition: hwloc.h:520
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
static __hwloc_inline 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
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:339
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
static __hwloc_inline int hwloc_cudart_get_device_pci_ids(hwloc_topology_t topology __hwloc_attribute_unused, 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_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