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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>pci_get_domain_bus_and_slot</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch09s05.html" title="PCI Support Library" /><link rel="prev" href="re387.html" title="pci_get_bus_and_slot" /><link rel="next" href="re389.html" title="pci_get_subsys" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>pci_get_domain_bus_and_slot</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re387.html">Prev</a> </td><th width="60%" align="center">PCI Support Library</th><td width="20%" align="right"> <a accesskey="n" href="re389.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="pci_get_domain_bus_and_slot"><a id="API-pci-get-domain-bus-and-slot"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>pci_get_domain_bus_and_slot —
locate PCI device for a given PCI domain (segment), bus, and slot
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">struct pci_dev * <b class="fsfunc">pci_get_domain_bus_and_slot </b>(</code></td><td>int <var class="pdparam">domain</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">bus</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">devfn</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3009678"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>domain</code></em></span></dt><dd><p>
PCI domain/segment on which the PCI device resides.
</p></dd><dt><span class="term"><em class="parameter"><code>bus</code></em></span></dt><dd><p>
PCI bus on which desired PCI device resides
</p></dd><dt><span class="term"><em class="parameter"><code>devfn</code></em></span></dt><dd><p>
encodes number of PCI slot in which the desired PCI device
resides and the logical device number within that slot in case of
multi-function devices.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3009742"></a><h2>Description</h2><p>
Given a PCI domain, bus, and slot/function number, the desired PCI
device is located in the list of PCI devices. If the device is
found, its reference count is increased and this function returns a
pointer to its data structure. The caller must decrement the
reference count by calling <code class="function">pci_dev_put</code>. If no device is found,
<code class="constant">NULL</code> is returned.
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