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/*
* Copyright © 2012-2016 Inria. All rights reserved.
* See COPYING in top-level directory.
*/
/** \file
* \brief Macros to help interaction between hwloc and the NVIDIA Management Library.
*
* Applications that use both hwloc and the NVIDIA Management Library may want to
* include this file so as to get topology information for NVML devices.
*/
#ifndef HWLOC_NVML_H
#define HWLOC_NVML_H
#include <hwloc.h>
#include <hwloc/autogen/config.h>
#include <hwloc/helper.h>
#ifdef HWLOC_LINUX_SYS
#include <hwloc/linux.h>
#endif
#include <nvml.h>
#ifdef __cplusplus
extern "C" {
#endif
/** \defgroup hwlocality_nvml Interoperability with the NVIDIA Management Library
*
* This interface offers ways to retrieve topology information about
* devices managed by the NVIDIA Management Library (NVML).
*
* @{
*/
/** \brief Get the CPU set of logical processors that are physically
* close to NVML device \p device.
*
* Return the CPU set describing the locality of the NVML device \p device.
*
* Topology \p topology and device \p device must match the local machine.
* I/O devices detection and the NVML component are not needed in the topology.
*
* The function only returns the locality of the device.
* If more information about the device is needed, OS objects should
* be used instead, see hwloc_nvml_get_device_osdev()
* and hwloc_nvml_get_device_osdev_by_index().
*
* This function is currently only implemented in a meaningful way for
* Linux; other systems will simply get a full cpuset.
*/
static __hwloc_inline int
hwloc_nvml_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
nvmlDevice_t device, hwloc_cpuset_t set)
{
#ifdef HWLOC_LINUX_SYS
/* If we're on Linux, use the sysfs mechanism to get the local cpus */
#define HWLOC_NVML_DEVICE_SYSFS_PATH_MAX 128
char path[HWLOC_NVML_DEVICE_SYSFS_PATH_MAX];
FILE *sysfile = NULL;
nvmlReturn_t nvres;
nvmlPciInfo_t pci;
if (!hwloc_topology_is_thissystem(topology)) {
errno = EINVAL;
return -1;
}
nvres = nvmlDeviceGetPciInfo(device, &pci);
if (NVML_SUCCESS != nvres) {
errno = EINVAL;
return -1;
}
sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", pci.domain, pci.bus, pci.device);
sysfile = fopen(path, "r");
if (!sysfile)
return -1;
if (hwloc_linux_parse_cpumap_file(sysfile, set) < 0
|| hwloc_bitmap_iszero(set))
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
fclose(sysfile);
#else
/* Non-Linux systems simply get a full cpuset */
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
#endif
return 0;
}
/** \brief Get the hwloc OS device object corresponding to the
* NVML device whose index is \p idx.
*
* Return the OS device object describing the NVML device whose
* index is \p idx. Returns NULL if there is none.
*
* The topology \p topology does not necessarily have to match the current
* machine. For instance the topology may be an XML import of a remote host.
* I/O devices detection and the NVML component must be enabled in the topology.
*
* \note The corresponding PCI device object can be obtained by looking
* at the OS device parent object.
*/
static __hwloc_inline hwloc_obj_t
hwloc_nvml_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
{
hwloc_obj_t osdev = NULL;
while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
if (HWLOC_OBJ_OSDEV_GPU == osdev->attr->osdev.type
&& osdev->name
&& !strncmp("nvml", osdev->name, 4)
&& atoi(osdev->name + 4) == (int) idx)
return osdev;
}
return NULL;
}
/** \brief Get the hwloc OS device object corresponding to NVML device \p device.
*
* Return the hwloc OS device object that describes the given
* NVML device \p device. Return NULL if there is none.
*
* Topology \p topology and device \p device must match the local machine.
* I/O devices detection and the NVML component must be enabled in the topology.
* If not, the locality of the object may still be found using
* hwloc_nvml_get_device_cpuset().
*
* \note The corresponding hwloc PCI device may be found by looking
* at the result parent pointer.
*/
static __hwloc_inline hwloc_obj_t
hwloc_nvml_get_device_osdev(hwloc_topology_t topology, nvmlDevice_t device)
{
hwloc_obj_t osdev;
nvmlReturn_t nvres;
nvmlPciInfo_t pci;
if (!hwloc_topology_is_thissystem(topology)) {
errno = EINVAL;
return NULL;
}
nvres = nvmlDeviceGetPciInfo(device, &pci);
if (NVML_SUCCESS != nvres)
return NULL;
osdev = NULL;
while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
hwloc_obj_t pcidev = osdev->parent;
if (strncmp(osdev->name, "nvml", 4))
continue;
if (pcidev
&& pcidev->type == HWLOC_OBJ_PCI_DEVICE
&& pcidev->attr->pcidev.domain == pci.domain
&& pcidev->attr->pcidev.bus == pci.bus
&& pcidev->attr->pcidev.dev == pci.device
&& pcidev->attr->pcidev.func == 0)
return osdev;
}
return NULL;
}
/** @} */
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* HWLOC_NVML_H */
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