mirror of https://github.com/xzeldon/htop.git
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
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/*
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* Copyright © 2010 INRIA. All rights reserved.
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* Copyright © 2010 Université Bordeaux 1
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* Copyright © 2011 Cisco Systems, Inc. All rights reserved.
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* See COPYING in top-level directory.
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*/
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/** \file
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* \brief Macros to help interaction between hwloc and the CUDA Driver API.
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*
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* Applications that use both hwloc and the CUDA Driver API may want to
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* include this file so as to get topology information for CUDA devices.
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*
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*/
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#ifndef HWLOC_CUDA_H
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#define HWLOC_CUDA_H
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#include <hwloc.h>
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#include <hwloc/autogen/config.h>
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#include <hwloc/linux.h>
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#include <cuda.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \defgroup hwlocality_cuda CUDA Driver API Specific Functions
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* @{
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*/
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/** \brief Get the CPU set of logical processors that are physically
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* close to device \p cudevice.
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*
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* For the given CUDA Driver API device \p cudevice, read the corresponding
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* kernel-provided cpumap file and return the corresponding CPU set.
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* This function is currently only implemented in a meaningful way for
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* Linux; other systems will simply get a full cpuset.
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*/
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static __hwloc_inline int
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hwloc_cuda_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
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CUdevice cudevice, hwloc_cpuset_t set)
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{
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#ifdef HWLOC_LINUX_SYS
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/* If we're on Linux, use the sysfs mechanism to get the local cpus */
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#define HWLOC_CUDA_DEVICE_SYSFS_PATH_MAX 128
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CUresult cres;
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int deviceid;
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int busid;
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char path[HWLOC_CUDA_DEVICE_SYSFS_PATH_MAX];
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FILE *sysfile = NULL;
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cres = cuDeviceGetAttribute(&busid, CU_DEVICE_ATTRIBUTE_PCI_BUS_ID, cudevice);
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if (cres != CUDA_SUCCESS) {
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errno = ENOSYS;
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return -1;
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}
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cres = cuDeviceGetAttribute(&deviceid, CU_DEVICE_ATTRIBUTE_PCI_DEVICE_ID, cudevice);
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if (cres != CUDA_SUCCESS) {
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errno = ENOSYS;
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return -1;
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}
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sprintf(path, "/sys/bus/pci/devices/0000:%02x:%02x.0/local_cpus", busid, deviceid);
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sysfile = fopen(path, "r");
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if (!sysfile)
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return -1;
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hwloc_linux_parse_cpumap_file(sysfile, set);
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fclose(sysfile);
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#else
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/* Non-Linux systems simply get a full cpuset */
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hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
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#endif
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return 0;
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}
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/** @} */
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* HWLOC_CUDA_H */
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