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Portable Hardware Locality (hwloc) Documentation: v2.0.3

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cudart.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_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))
110 #else
111  /* Non-Linux systems simply get a full cpuset */
113 #endif
114  return 0;
115 }
116 
127 static __hwloc_inline hwloc_obj_t
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
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_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
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:89
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
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.
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:636
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:1086
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:1123
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
char * name
Object-specific name if any. Mostly used for identifying OS devices and Misc objects where a name str...
Definition: hwloc.h:369
hwloc_obj_osdev_type_t type
Definition: hwloc.h:610
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:376
Structure of a topology object.
Definition: hwloc.h:357
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:139
Operating system co-processor device. For instance "mic0" for a Xeon Phi (MIC) on Linux...
Definition: hwloc.h:312
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
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
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.
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.
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