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-<table class="head">
- <tr>
- <td class="head-ltitle">BUS_GET_CPUS(9)</td>
- <td class="head-vol">Kernel Developer's Manual</td>
- <td class="head-rtitle">BUS_GET_CPUS(9)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">BUS_GET_CPUS</code>,
- <code class="Nm">bus_get_cpus</code> &#x2014; <span class="Nd">request a set
- of device-specific CPUs</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
- &lt;<a class="In">sys/param.h</a>&gt;</code>
- <br/>
- <code class="In">#include &lt;<a class="In">sys/bus.h</a>&gt;</code>
- <br/>
- <code class="In">#include &lt;<a class="In">sys/cpuset.h</a>&gt;</code></p>
-<p class="Pp"><var class="Ft">int</var>
- <br/>
- <code class="Fn">BUS_GET_CPUS</code>(<var class="Fa">device_t dev</var>,
- <var class="Fa">device_t child</var>, <var class="Fa">enum cpu_sets
- op</var>, <var class="Fa">size_t setsize</var>, <var class="Fa">cpuset_t
- *cpuset</var>);</p>
-<p class="Pp"><var class="Ft">int</var>
- <br/>
- <code class="Fn">bus_get_cpus</code>(<var class="Fa">device_t dev</var>,
- <var class="Fa">enum cpu_sets op</var>, <var class="Fa">size_t
- setsize</var>, <var class="Fa">cpuset_t *cpuset</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The
- <a class="permalink" href="#BUS_GET_CPUS"><code class="Fn" id="BUS_GET_CPUS">BUS_GET_CPUS</code></a>()
- method queries the parent bus device for a set of device-specific CPUs. The
- <var class="Fa">op</var> argument specifies which set of CPUs to retrieve.
- If successful, the requested set of CPUs are returned in
- <var class="Fa">cpuset</var>. The <var class="Fa">setsize</var> argument
- specifies the size in bytes of the set passed in
- <var class="Fa">cpuset</var>.</p>
-<p class="Pp" id="BUS_GET_CPUS~2"><a class="permalink" href="#BUS_GET_CPUS~2"><code class="Fn">BUS_GET_CPUS</code></a>()
- supports querying different types of CPU sets via the <var class="Fa">op
- argument.</var> Not all set types are supported for every device. If a set
- type is not supported, <code class="Fn">BUS_GET_CPUS</code>() fails with
- <code class="Er">EINVAL</code>. These set types are supported:</p>
-<dl class="Bl-tag">
- <dt id="LOCAL_CPUS"><a class="permalink" href="#LOCAL_CPUS"><code class="Dv">LOCAL_CPUS</code></a></dt>
- <dd>The set of CPUs that are local to the device. If a device is closer to a
- specific memory domain in a non-uniform memory architecture system (NUMA),
- this will return the set of CPUs in that memory domain.</dd>
- <dt id="INTR_CPUS"><a class="permalink" href="#INTR_CPUS"><code class="Dv">INTR_CPUS</code></a></dt>
- <dd>The preferred set of CPUs that this device should use for device
- interrupts. This set type must be supported by all bus drivers.</dd>
-</dl>
-<p class="Pp" id="bus_get_cpus">The
- <a class="permalink" href="#bus_get_cpus"><code class="Fn">bus_get_cpus</code></a>()
- function is a simple wrapper around
- <code class="Fn">BUS_GET_CPUS</code>().</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
- VALUES</a></h1>
-<p class="Pp">Zero is returned on success, otherwise an appropriate error is
- returned.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">cpuset(2)</a>, <a class="Xr">BUS_BIND_INTR(9)</a>,
- <a class="Xr">device(9)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Fn">BUS_GET_CPUS</code>() method and
- <code class="Fn">bus_get_cpus</code>() function first appeared in
- <span class="Ux">FreeBSD 11.0</span>.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">March 1, 2016</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>