nvml.h

/*
 * SPDX-License-Identifier: BSD-3-Clause
 * Copyright © 2012-2023 Inria.  All rights reserved.
 * See COPYING in top-level directory.
 */

 
#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
 


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];
  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);
  if (hwloc_linux_read_path_as_cpumask(path, set) < 0
      || hwloc_bitmap_iszero(set))
    hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
#else
  /* Non-Linux systems simply get a full cpuset */
  hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
#endif
  return 0;
}

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;
}

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;
        char uuid[64];
 
        if (!hwloc_topology_is_thissystem(topology)) {
                errno = EINVAL;
                return NULL;
        }
 
        nvres = nvmlDeviceGetPciInfo(device, &pci);
        if (NVML_SUCCESS != nvres)
                return NULL;
 
        nvres = nvmlDeviceGetUUID(device, uuid, sizeof(uuid));
        if (NVML_SUCCESS != nvres)
                uuid[0] = '\0';
 
        osdev = NULL;
        while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
                hwloc_obj_t pcidev = osdev->parent;
                const char *info;
 
                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;
 
                info = hwloc_obj_get_info_by_name(osdev, "NVIDIAUUID");
                if (info && !strcmp(info, uuid))
                        return osdev;
        }
 
        return NULL;
}

 
 
#ifdef __cplusplus
} /* extern "C" */
#endif
 
 
#endif /* HWLOC_NVML_H */