1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>ccw_device_start</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="ccwdev.html" title="ccw devices"><link rel="prev" href="API-ccw-device-start-timeout-key.html" title="ccw_device_start_timeout_key"><link rel="next" href="API-ccw-device-start-timeout.html" title="ccw_device_start_timeout"></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">ccw_device_start</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-ccw-device-start-timeout-key.html">Prev</a>&#160;</td><th width="60%" align="center">ccw devices</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-ccw-device-start-timeout.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-ccw-device-start"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ccw_device_start &#8212; 
2     start a s390 channel program
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">ccw_device_start </b>(</code></td><td>struct ccw_device * <var class="pdparam">cdev</var>, </td></tr><tr><td>&#160;</td><td>struct ccw1 * <var class="pdparam">cpa</var>, </td></tr><tr><td>&#160;</td><td>unsigned long <var class="pdparam">intparm</var>, </td></tr><tr><td>&#160;</td><td>__u8 <var class="pdparam">lpm</var>, </td></tr><tr><td>&#160;</td><td>unsigned long <var class="pdparam">flags</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1124315068"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>cdev</code></em></span></dt><dd><p>
4     target ccw device
5    </p></dd><dt><span class="term"><em class="parameter"><code>cpa</code></em></span></dt><dd><p>
6     logical start address of channel program
7    </p></dd><dt><span class="term"><em class="parameter"><code>intparm</code></em></span></dt><dd><p>
8     user specific interruption parameter; will be presented back to
9     <em class="parameter"><code>cdev</code></em>'s interrupt handler. Allows a device driver to associate
10     the interrupt with a particular I/O request.
11    </p></dd><dt><span class="term"><em class="parameter"><code>lpm</code></em></span></dt><dd><p>
12     defines the channel path to be used for a specific I/O request. A
13     value of 0 will make cio use the opm.
14    </p></dd><dt><span class="term"><em class="parameter"><code>flags</code></em></span></dt><dd><p>
15     additional flags; defines the action to be performed for I/O
16     processing.
17    </p></dd></dl></div></div><div class="refsect1"><a name="idp1124321236"></a><h2>Description</h2><p>
18   Start a S/390 channel program. When the interrupt arrives, the
19   IRQ handler is called, either immediately, delayed (dev-end missing,
20   or sense required) or never (no IRQ handler registered).
21</p></div><div class="refsect1"><a name="idp1124322020"></a><h2>Returns</h2><p>
22   <code class="constant">0</code>, if the operation was successful;
23   -<code class="constant">EBUSY</code>, if the device is busy, or status pending;
24   -<code class="constant">EACCES</code>, if no path specified in <em class="parameter"><code>lpm</code></em> is operational;
25   -<code class="constant">ENODEV</code>, if the device is not operational.
26</p></div><div class="refsect1"><a name="idp1124323828"></a><h2>Context</h2><p>
27   Interrupts disabled, ccw device lock held
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