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 /*
  * SPDX-License-Identifier: BSD-3-Clause
  * Copyright © 2010-2023 Inria.  All rights reserved.
  * Copyright © 2010-2011 Université Bordeaux
  * Copyright © 2011 Cisco Systems, Inc.  All rights reserved.
  * See COPYING in top-level directory.
  */
 
 /** \file
  * \brief Macros to help interaction between hwloc and the CUDA Runtime API.
  *
  * Applications that use both hwloc and the CUDA Runtime API may want to
  * include this file so as to get topology information for CUDA devices.
  *
  */
 
 #ifndef HWLOC_CUDART_H
 #define HWLOC_CUDART_H
 
 #include "hwloc.h"
 #include "hwloc/autogen/config.h"
 #include "hwloc/helper.h"
 #ifdef HWLOC_LINUX_SYS
 #include "hwloc/linux.h"
 #endif
 
 #include <cuda.h> /* for CUDA_VERSION */
 #include <cuda_runtime_api.h>
 
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 
 /** \defgroup hwlocality_cudart Interoperability with the CUDA Runtime API
  *
  * This interface offers ways to retrieve topology information about
  * CUDA devices when using the CUDA Runtime API.
  *
  * @{
  */
 
 /** \brief Return the domain, bus and device IDs of the CUDA device whose index is \p idx.
  *
  * Device index \p idx must match the local machine.
  *
  * \return 0 on success.
  * \return -1 on error, for instance if device information could not be found.
  */
 static __hwloc_inline int
 hwloc_cudart_get_device_pci_ids(hwloc_topology_t topology __hwloc_attribute_unused,
                 int idx, int *domain, int *bus, int *dev)
 {
   cudaError_t cerr;
   struct cudaDeviceProp prop;
 
   cerr = cudaGetDeviceProperties(&prop, idx);
   if (cerr) {
     errno = ENOSYS;
     return -1;
   }
 
 #if CUDA_VERSION >= 4000
   *domain = prop.pciDomainID;
 #else
   *domain = 0;
 #endif
 
   *bus = prop.pciBusID;
   *dev = prop.pciDeviceID;
 
   return 0;
 }
 
 /** \brief Get the CPU set of processors that are physically
  * close to device \p idx.
  *
  * Store in \p set the CPU-set describing the locality of the CUDA device
  * whose index is \p idx.
  *
  * Topology \p topology and device \p idx must match the local machine.
  * I/O devices detection and the CUDA 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_cudart_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.
  *
  * \return 0 on success.
  * \return -1 on error, for instance if device information could not be found.
  */
 static __hwloc_inline int
 hwloc_cudart_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
                    int idx, hwloc_cpuset_t set)
 {
 #ifdef HWLOC_LINUX_SYS
   /* If we're on Linux, use the sysfs mechanism to get the local cpus */
 #define HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX 128
   char path[HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX];
   int domain, bus, dev;
 
   if (hwloc_cudart_get_device_pci_ids(topology, idx, &domain, &bus, &dev))
     return -1;
 
   if (!hwloc_topology_is_thissystem(topology)) {
     errno = EINVAL;
     return -1;
   }
 
   sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", (unsigned) domain, (unsigned) bus, (unsigned) dev);
   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;
 }
 
 /** \brief Get the hwloc PCI device object corresponding to the
  * CUDA device whose index is \p idx.
  *
  * \return The hwloc PCI device object describing the CUDA device whose index is \p idx.
  * \return \c NULL if none could be found.
  *
  * Topology \p topology and device \p idx must match the local machine.
  * I/O devices detection must be enabled in topology \p topology.
  * The CUDA component is not needed in the topology.
  */
 static __hwloc_inline hwloc_obj_t
 hwloc_cudart_get_device_pcidev(hwloc_topology_t topology, int idx)
 {
   int domain, bus, dev;
 
   if (hwloc_cudart_get_device_pci_ids(topology, idx, &domain, &bus, &dev))
     return NULL;
 
   return hwloc_get_pcidev_by_busid(topology, domain, bus, dev, 0);
 }
 
 /** \brief Get the hwloc OS device object corresponding to the
  * CUDA device whose index is \p idx.
  *
  * \return The hwloc OS device object describing the CUDA device whose index is \p idx.
  * \return \c NULL if none could be found.
  *
  * 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 CUDA component must be enabled in the topology.
  * If not, the locality of the object may still be found using
  * hwloc_cudart_get_device_cpuset().
  *
  * \note The corresponding PCI device object can be obtained by looking
  * at the OS device parent object (unless PCI devices are filtered out).
  *
  * \note This function is identical to hwloc_cuda_get_device_osdev_by_index().
  */
 static __hwloc_inline hwloc_obj_t
 hwloc_cudart_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_COPROC == osdev->attr->osdev.type
             && osdev->name
             && !strncmp("cuda", osdev->name, 4)
             && atoi(osdev->name + 4) == (int) idx)
             return osdev;
     }
     return NULL;
 }
 
 /** @} */
 
 
 #ifdef __cplusplus
 } /* extern "C" */
 #endif
 
 
 #endif /* HWLOC_CUDART_H */

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