amdsmi.h

/*
 * SPDX-License-Identifier: BSD-3-Clause
 * Copyright © 2012-2026 Inria.  All rights reserved.
 * Copyright (c) 2020, Advanced Micro Devices, Inc. All rights reserved.
 * Written by Advanced Micro Devices,
 * See COPYING in top-level directory.
 */
 
#ifndef HWLOC_AMDSMI_H
#define HWLOC_AMDSMI_H
 
#include "hwloc.h"
#include "hwloc/autogen/config.h"
#include "hwloc/helper.h"
#ifdef HWLOC_LINUX_SYS
#include "hwloc/linux.h"
#endif
 
#include <amd_smi/amdsmi.h>
 
 
#ifdef __cplusplus
extern "C" {
#endif
 
 
static __hwloc_inline int
hwloc_amdsmi_get_device_cpuset(hwloc_topology_t topology,
                               amdsmi_processor_handle proc, hwloc_cpuset_t set)
{
#ifdef HWLOC_LINUX_SYS
  /* If we're on Linux, use the sysfs mechanism to get the local cpus */
#define HWLOC_RSMI_DEVICE_SYSFS_PATH_MAX 128
  char path[HWLOC_RSMI_DEVICE_SYSFS_PATH_MAX];
  amdsmi_status_t ret;
  uint64_t bdfid = 0;
  unsigned domain, device, bus;
 
  if (!hwloc_topology_is_thissystem(topology)) {
    errno = EINVAL;
    return -1;
  }
 
  ret = amdsmi_get_gpu_bdf_id(proc, &bdfid);
  if (AMDSMI_STATUS_SUCCESS != ret) {
    errno = EINVAL;
    return -1;
  }
  domain = (bdfid>>32) & 0xffffffff;
  bus = ((bdfid & 0xffff)>>8) & 0xff;
  device = ((bdfid & 0xff)>>3) & 0x1f;
 
  sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", domain, bus, 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_amdsmi_get_device_osdev_by_index(hwloc_topology_t topology, uint32_t hip_id)
{
  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("rsmi", osdev->name, 4)
      && atoi(osdev->name + 4) == (int) hip_id)
      return osdev;
  }
  return NULL;
}
 
static __hwloc_inline hwloc_obj_t
hwloc_amdsmi_get_device_osdev(hwloc_topology_t topology, amdsmi_processor_handle proc)
{
  amdsmi_status_t ret;
  amdsmi_enumeration_info_t enum_info;
 
  ret = amdsmi_get_gpu_enumeration_info(proc, &enum_info);
  if (AMDSMI_STATUS_SUCCESS != ret)
    return NULL;
 
  return hwloc_amdsmi_get_device_osdev_by_index(topology, enum_info.hip_id);
}
 
#ifdef __cplusplus
} /* extern "C" */
#endif
 
 
#endif /* HWLOC_AMDSMI_H */