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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>ccw_device_start_key</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="ch02s02.html" title="ccw devices" /><link rel="prev" href="re25.html" title="ccw_device_clear" /><link rel="next" href="re27.html" title="ccw_device_start_timeout_key" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>ccw_device_start_key</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re25.html">Prev</a> </td><th width="60%" align="center">ccw devices</th><td width="20%" align="right"> <a accesskey="n" href="re27.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="ccw_device_start_key"><a id="API-ccw-device-start-key"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ccw_device_start_key —
start a s390 channel program with key
</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">int <b class="fsfunc">ccw_device_start_key </b>(</code></td><td>struct ccw_device * <var class="pdparam">cdev</var>, </td></tr><tr><td> </td><td>struct ccw1 * <var class="pdparam">cpa</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">intparm</var>, </td></tr><tr><td> </td><td>__u8 <var class="pdparam">lpm</var>, </td></tr><tr><td> </td><td>__u8 <var class="pdparam">key</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">flags</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2576745"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>cdev</code></em></span></dt><dd><p>
target ccw device
</p></dd><dt><span class="term"><em class="parameter"><code>cpa</code></em></span></dt><dd><p>
logical start address of channel program
</p></dd><dt><span class="term"><em class="parameter"><code>intparm</code></em></span></dt><dd><p>
user specific interruption parameter; will be presented back to
<em class="parameter"><code>cdev</code></em>'s interrupt handler. Allows a device driver to associate
the interrupt with a particular I/O request.
</p></dd><dt><span class="term"><em class="parameter"><code>lpm</code></em></span></dt><dd><p>
defines the channel path to be used for a specific I/O request. A
value of 0 will make cio use the opm.
</p></dd><dt><span class="term"><em class="parameter"><code>key</code></em></span></dt><dd><p>
storage key to be used for the I/O
</p></dd><dt><span class="term"><em class="parameter"><code>flags</code></em></span></dt><dd><p>
additional flags; defines the action to be performed for I/O
processing.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2576865"></a><h2>Description</h2><p>
Start a S/390 channel program. When the interrupt arrives, the
IRQ handler is called, either immediately, delayed (dev-end missing,
or sense required) or never (no IRQ handler registered).
</p></div><div class="refsect1" title="Returns"><a id="id2576878"></a><h2>Returns</h2><p>
<code class="constant">0</code>, if the operation was successful;
-<code class="constant">EBUSY</code>, if the device is busy, or status pending;
-<code class="constant">EACCES</code>, if no path specified in <em class="parameter"><code>lpm</code></em> is operational;
-<code class="constant">ENODEV</code>, if the device is not operational.
</p></div><div class="refsect1" title="Context"><a id="id2576908"></a><h2>Context</h2><p>
Interrupts disabled, ccw device lock held
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