<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>struct ccw_dev_id</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Writing s390 channel device drivers" /><link rel="up" href="ch02.html#channelIO" title="I/O functions for channel-attached devices" /><link rel="prev" href="re09.html" title="struct ciw" /><link rel="next" href="re11.html" title="ccw_dev_id_is_equal" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>struct ccw_dev_id</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re09.html">Prev</a> </td><th width="60%" align="center">I/O functions for channel-attached devices</th><td width="20%" align="right"> <a accesskey="n" href="re11.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="struct ccw_dev_id"><a id="API-struct-ccw-dev-id"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>struct ccw_dev_id —
unique identifier for ccw devices
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><pre class="programlisting">
struct ccw_dev_id {
u8 ssid;
u16 devno;
}; </pre></div><div class="refsect1" title="Members"><a id="id3089807"></a><h2>Members</h2><div class="variablelist"><dl><dt><span class="term">ssid</span></dt><dd><p>
subchannel set id
</p></dd><dt><span class="term">devno</span></dt><dd><p>
device number
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3089838"></a><h2>Description</h2><p>
This structure is not directly based on any hardware structure. The
hardware identifies a device by its device number and its subchannel,
which is in turn identified by its id. In order to get a unique identifier
for ccw devices across subchannel sets, <em class="parameter"><code>struct</code></em> ccw_dev_id has been
introduced.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re09.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html#channelIO">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re11.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>struct ciw</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>ccw_dev_id_is_equal</span></td></tr></table></div></body></html>
