Hardware Locality (hwloc) 1.6.2

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cudart.h
1 /*
2 * Copyright © 2010-2012 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/linux.h>
22 #include <hwloc/helper.h>
23
24 #include <cuda_runtime_api.h>
25
26
27 #ifdef __cplusplus
28 extern "C" {
29 #endif
30
31
38 static inline int
39 hwloc_cudart_get_device_pci_ids(hwloc_topology_t topology ,
40 int device, int *domain, int *bus, int *dev)
41 {
42 cudaError_t cerr;
43 struct cudaDeviceProp prop;
44
45 cerr = cudaGetDeviceProperties(&prop, device);
46 if (cerr) {
47 errno = ENOSYS;
48 return -1;
49 }
50
51 #if CUDART_VERSION >= 4000
52 *domain = prop.pciDomainID;
53 #else
54 *domain = 0;
55 #endif
56
57 *bus = prop.pciBusID;
58 *dev = prop.pciDeviceID;
59
60 return 0;
61 }
62
73 static inline int
74 hwloc_cudart_get_device_cpuset(hwloc_topology_t topology ,
75 int device, hwloc_cpuset_t set)
76 {
77 #ifdef HWLOC_LINUX_SYS
78 /* If we're on Linux, use the sysfs mechanism to get the local cpus */
79 #define HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX 128
80 char path[HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX];
81 FILE *sysfile = NULL;
82 int domain, bus, dev;
83
84 if (hwloc_cudart_get_device_pci_ids(topology, device, &domain, &bus, &dev))
85 return -1;
86
87 if (!hwloc_topology_is_thissystem(topology)) {
88 errno = EINVAL;
89 return -1;
90 }
91
92 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", domain, bus, dev);
93 sysfile = fopen(path, "r");
94 if (!sysfile)
95 return -1;
96
97 hwloc_linux_parse_cpumap_file(sysfile, set);
98 if (hwloc_bitmap_iszero(set))
99 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
100
101 fclose(sysfile);
102 #else
103 /* Non-Linux systems simply get a full cpuset */
104 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
105 #endif
106 return 0;
107 }
108
117 static inline hwloc_obj_t
118 hwloc_cudart_get_device_pcidev(hwloc_topology_t topology, int device)
119 {
120 int domain, bus, dev;
121
122 if (hwloc_cudart_get_device_pci_ids(topology, device, &domain, &bus, &dev))
123 return NULL;
124
125 return hwloc_get_pcidev_by_busid(topology, domain, bus, dev, 0);
126 }
127
131 #ifdef __cplusplus
132 } /* extern "C" */
133 #endif
134
135
136 #endif /* HWLOC_CUDART_H */