1<html><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 V1.78.1"><link rel="home" href="index.html" title="Writing s390 channel device drivers"><link rel="up" href="ccw.html#channelIO" title="I/O functions for channel-attached devices"><link rel="prev" href="API-struct-ciw.html" title="struct ciw"><link rel="next" href="API-ccw-dev-id-is-equal.html" title="ccw_dev_id_is_equal"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">struct ccw_dev_id</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-struct-ciw.html">Prev</a>&#160;</td><th width="60%" align="center">I/O functions for channel-attached devices</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-ccw-dev-id-is-equal.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-struct-ccw-dev-id"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>struct ccw_dev_id &#8212; 
2     unique identifier for ccw devices
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="programlisting">
4struct ccw_dev_id {
5  u8 ssid;
6  u16 devno;
7};  </pre></div><div class="refsect1"><a name="idp1124126156"></a><h2>Members</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term">ssid</span></dt><dd><p>
8   subchannel set id
9      </p></dd><dt><span class="term">devno</span></dt><dd><p>
10   device number
11      </p></dd></dl></div></div><div class="refsect1"><a name="idp1124128052"></a><h2>Description</h2><p>
12   This structure is not directly based on any hardware structure. The
13   hardware identifies a device by its device number and its subchannel,
14   which is in turn identified by its id. In order to get a unique identifier
15   for ccw devices across subchannel sets, <em class="parameter"><code>struct</code></em> ccw_dev_id has been
16   introduced.
17</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-struct-ciw.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="ccw.html#channelIO">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-ccw-dev-id-is-equal.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">struct ciw</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">ccw_dev_id_is_equal</span></td></tr></table></div></body></html>
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