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00016 #ifndef HWLOC_CUDART_H
00017 #define HWLOC_CUDART_H
00018
00019 #include <hwloc.h>
00020 #include <hwloc/autogen/config.h>
00021 #include <hwloc/helper.h>
00022 #ifdef HWLOC_LINUX_SYS
00023 #include <hwloc/linux.h>
00024 #endif
00025
00026 #include <cuda.h>
00027 #include <cuda_runtime_api.h>
00028
00029
00030 #ifdef __cplusplus
00031 extern "C" {
00032 #endif
00033
00034
00047 static __hwloc_inline int
00048 hwloc_cudart_get_device_pci_ids(hwloc_topology_t topology __hwloc_attribute_unused,
00049 int idx, int *domain, int *bus, int *dev)
00050 {
00051 cudaError_t cerr;
00052 struct cudaDeviceProp prop;
00053
00054 cerr = cudaGetDeviceProperties(&prop, idx);
00055 if (cerr) {
00056 errno = ENOSYS;
00057 return -1;
00058 }
00059
00060 #if CUDA_VERSION >= 4000
00061 *domain = prop.pciDomainID;
00062 #else
00063 *domain = 0;
00064 #endif
00065
00066 *bus = prop.pciBusID;
00067 *dev = prop.pciDeviceID;
00068
00069 return 0;
00070 }
00071
00088 static __hwloc_inline int
00089 hwloc_cudart_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
00090 int idx, hwloc_cpuset_t set)
00091 {
00092 #ifdef HWLOC_LINUX_SYS
00093
00094 #define HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX 128
00095 char path[HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX];
00096 int domain, bus, dev;
00097
00098 if (hwloc_cudart_get_device_pci_ids(topology, idx, &domain, &bus, &dev))
00099 return -1;
00100
00101 if (!hwloc_topology_is_thissystem(topology)) {
00102 errno = EINVAL;
00103 return -1;
00104 }
00105
00106 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", (unsigned) domain, (unsigned) bus, (unsigned) dev);
00107 if (hwloc_linux_read_path_as_cpumask(path, set) < 0
00108 || hwloc_bitmap_iszero(set))
00109 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
00110 #else
00111
00112 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
00113 #endif
00114 return 0;
00115 }
00116
00127 static __hwloc_inline hwloc_obj_t
00128 hwloc_cudart_get_device_pcidev(hwloc_topology_t topology, int idx)
00129 {
00130 int domain, bus, dev;
00131
00132 if (hwloc_cudart_get_device_pci_ids(topology, idx, &domain, &bus, &dev))
00133 return NULL;
00134
00135 return hwloc_get_pcidev_by_busid(topology, domain, bus, dev, 0);
00136 }
00137
00155 static __hwloc_inline hwloc_obj_t
00156 hwloc_cudart_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
00157 {
00158 hwloc_obj_t osdev = NULL;
00159 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
00160 if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
00161 && osdev->name
00162 && !strncmp("cuda", osdev->name, 4)
00163 && atoi(osdev->name + 4) == (int) idx)
00164 return osdev;
00165 }
00166 return NULL;
00167 }
00168
00172 #ifdef __cplusplus
00173 }
00174 #endif
00175
00176
00177 #endif