rsmi.h

/*
 * SPDX-License-Identifier: BSD-3-Clause
 * Copyright © 2012-2023 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_RSMI_H
#define HWLOC_RSMI_H
 
#include "hwloc.h"
#include "hwloc/autogen/config.h"
#include "hwloc/helper.h"
#ifdef HWLOC_LINUX_SYS
#include "hwloc/linux.h"
#endif
 
#include <rocm_smi/rocm_smi.h>
 
 
#ifdef __cplusplus
extern "C" {
#endif
 


static __hwloc_inline int
hwloc_rsmi_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
                             uint32_t dv_ind, 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];
  rsmi_status_t ret;
  uint64_t bdfid = 0;
  unsigned domain, device, bus;
 
  if (!hwloc_topology_is_thissystem(topology)) {
    errno = EINVAL;
    return -1;
  }
 
  ret = rsmi_dev_pci_id_get(dv_ind, &bdfid);
  if (RSMI_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_rsmi_get_device_osdev_by_index(hwloc_topology_t topology, uint32_t dv_ind)
{
  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) dv_ind)
      return osdev;
  }
  return NULL;
}

static __hwloc_inline hwloc_obj_t
hwloc_rsmi_get_device_osdev(hwloc_topology_t topology, uint32_t dv_ind)
{
  hwloc_obj_t osdev;
  rsmi_status_t ret;
  uint64_t bdfid = 0;
  unsigned domain, device, bus, func;
  uint64_t id;
  char uuid[64];
 
  if (!hwloc_topology_is_thissystem(topology)) {
    errno = EINVAL;
    return NULL;
  }
 
  ret = rsmi_dev_pci_id_get(dv_ind, &bdfid);
  if (RSMI_STATUS_SUCCESS != ret) {
    errno = EINVAL;
    return NULL;
  }
  domain = (bdfid>>32) & 0xffffffff;
  bus = ((bdfid & 0xffff)>>8) & 0xff;
  device = ((bdfid & 0xff)>>3) & 0x1f;
  func = bdfid & 0x7;
 
  ret = rsmi_dev_unique_id_get(dv_ind, &id);
  if (RSMI_STATUS_SUCCESS != ret)
    uuid[0] = '\0';
  else
    sprintf(uuid, "%lx", id);
 
  osdev = NULL;
  while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
    hwloc_obj_t pcidev = osdev->parent;
    const char *info;
 
    if (strncmp(osdev->name, "rsmi", 4))
      continue;
 
    if (pcidev
      && pcidev->type == HWLOC_OBJ_PCI_DEVICE
      && pcidev->attr->pcidev.domain == domain
      && pcidev->attr->pcidev.bus == bus
      && pcidev->attr->pcidev.dev == device
      && pcidev->attr->pcidev.func == func)
      return osdev;
 
    info = hwloc_obj_get_info_by_name(osdev, "AMDUUID");
    if (info && !strcmp(info, uuid))
      return osdev;
  }
 
  return NULL;
}

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