---
name: "hwloc_rsmi_get_device_osdev"
section: "3"
platform: "linux"
package: "hwloc"
version: "2.15.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/hwlocality_rsmi"
---

# hwloc\_rsmi\_get\_device\_osdev(3)

Interoperability with the ROCm SMI Management Library

Part of [hwlocality\_rsmi(3)](/hwlocality_rsmi/3.md).

## NAME

hwlocality\_rsmi - Interoperability with the ROCm SMI Management Library

## SYNOPSIS

### Functions

int **hwloc\_rsmi\_get\_device\_cpuset** (**hwloc\_topology\_t** topology, uint32\_t dv\_ind, **hwloc\_cpuset\_t** set)\
 **hwloc\_obj\_t** **hwloc\_rsmi\_get\_device\_osdev\_by\_index** (**hwloc\_topology\_t** topology, uint32\_t dv\_ind)\
 **hwloc\_obj\_t** **hwloc\_rsmi\_get\_device\_osdev** (**hwloc\_topology\_t** topology, uint32\_t dv\_ind)\

## Detailed Description

This interface offers ways to retrieve topology information about devices managed by the ROCm SMI Management Library.

## Function Documentation

### int hwloc\_rsmi\_get\_device\_cpuset (hwloc\_topology\_t topology, uint32\_t dv\_ind, hwloc\_cpuset\_t set) \[inline\]

Get the CPU set of logical processors that are physically close to AMD GPU device whose index is dv\_ind. Store in set the CPU-set describing the locality of the AMD GPU device whose index is dv\_ind.

Topology topology and device dv\_ind must match the local machine. I/O devices detection and the ROCm SMI 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\_rsmi\_get\_device\_osdev()** and **hwloc\_rsmi\_get\_device\_osdev\_by\_index()**.

This function is currently only implemented in a meaningful way for Linux; other systems will simply get the cpuset of the entire topology.

**Returns**

0 on success.

\-1 on error, for instance if device information could not be found.

### hwloc\_obj\_t hwloc\_rsmi\_get\_device\_osdev (hwloc\_topology\_t topology, uint32\_t dv\_ind) \[inline\]

Get the hwloc OS device object corresponding to AMD GPU device, whose index is dv\_ind.

**Returns**

The hwloc OS device object that describes the given AMD GPU, whose index is dv\_ind.

NULL if none could be found.

Topology topology and device dv\_ind must match the local machine. I/O devices detection and the ROCm SMI component must be enabled in the topology. If not, the locality of the object may still be found using **hwloc\_rsmi\_get\_device\_cpuset()**.

**Note**

The corresponding hwloc PCI device may be found by looking at the result parent pointer (unless PCI devices are filtered out).

### hwloc\_obj\_t hwloc\_rsmi\_get\_device\_osdev\_by\_index (hwloc\_topology\_t topology, uint32\_t dv\_ind) \[inline\]

Get the hwloc OS device object corresponding to the AMD GPU device whose index is dv\_ind.

**Returns**

The hwloc OS device object describing the AMD GPU device whose index is dv\_ind.

NULL if none could be found.

The topology 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 ROCm SMI component must be enabled in the topology.

**Note**

The corresponding PCI device object can be obtained by looking at the OS device parent object (unless PCI devices are filtered out).

## Author

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