Hardware Locality (hwloc) 1.2.2
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00001 /* 00002 * Copyright © 2010 INRIA. All rights reserved. 00003 * Copyright © 2010 Université Bordeaux 1 00004 * Copyright © 2011 Cisco Systems, Inc. All rights reserved. 00005 * See COPYING in top-level directory. 00006 */ 00007 00016 #ifndef HWLOC_CUDA_H 00017 #define HWLOC_CUDA_H 00018 00019 #include <hwloc.h> 00020 #include <hwloc/autogen/config.h> 00021 #include <hwloc/linux.h> 00022 00023 #include <cuda.h> 00024 00025 00026 #ifdef __cplusplus 00027 extern "C" { 00028 #endif 00029 00030 00043 static inline int 00044 hwloc_cuda_get_device_cpuset(hwloc_topology_t topology , 00045 CUdevice cudevice, hwloc_cpuset_t set) 00046 { 00047 #ifdef HWLOC_LINUX_SYS 00048 /* If we're on Linux, use the sysfs mechanism to get the local cpus */ 00049 #define HWLOC_CUDA_DEVICE_SYSFS_PATH_MAX 128 00050 CUresult cres; 00051 int deviceid; 00052 int busid; 00053 char path[HWLOC_CUDA_DEVICE_SYSFS_PATH_MAX]; 00054 FILE *sysfile = NULL; 00055 00056 cres = cuDeviceGetAttribute(&busid, CU_DEVICE_ATTRIBUTE_PCI_BUS_ID, cudevice); 00057 if (cres != CUDA_SUCCESS) { 00058 errno = ENOSYS; 00059 return -1; 00060 } 00061 cres = cuDeviceGetAttribute(&deviceid, CU_DEVICE_ATTRIBUTE_PCI_DEVICE_ID, cudevice); 00062 if (cres != CUDA_SUCCESS) { 00063 errno = ENOSYS; 00064 return -1; 00065 } 00066 00067 sprintf(path, "/sys/bus/pci/devices/0000:%02x:%02x.0/local_cpus", busid, deviceid); 00068 sysfile = fopen(path, "r"); 00069 if (!sysfile) 00070 return -1; 00071 00072 hwloc_linux_parse_cpumap_file(sysfile, set); 00073 00074 fclose(sysfile); 00075 #else 00076 /* Non-Linux systems simply get a full cpuset */ 00077 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology)); 00078 #endif 00079 return 0; 00080 } 00081 00085 #ifdef __cplusplus 00086 } /* extern "C" */ 00087 #endif 00088 00089 00090 #endif /* HWLOC_CUDA_H */