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<!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>dmam_alloc_coherent</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="Linux Device Drivers" /><link rel="up" href="ch02s03.html" title="Device Drivers DMA Management" /><link rel="prev" href="API-dma-mmap-from-coherent.html" title="dma_mmap_from_coherent" /><link rel="next" href="API-dmam-free-coherent.html" title="dmam_free_coherent" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">dmam_alloc_coherent</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-dma-mmap-from-coherent.html">Prev</a>&#160;</td><th width="60%" align="center">Device Drivers DMA Management</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-dmam-free-coherent.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-dmam-alloc-coherent"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>dmam_alloc_coherent &#8212; 
  Managed <code class="function">dma_alloc_coherent</code>
 </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">void * <strong class="fsfunc">dmam_alloc_coherent </strong>(</code></td><td>struct device * <var class="pdparam">dev</var>, </td></tr><tr><td>&#160;</td><td>size_t <var class="pdparam">size</var>, </td></tr><tr><td>&#160;</td><td>dma_addr_t * <var class="pdparam">dma_handle</var>, </td></tr><tr><td>&#160;</td><td>gfp_t <var class="pdparam">gfp</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140404962994560"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>dev</code></em></span></dt><dd><p>
     Device to allocate coherent memory for
    </p></dd><dt><span class="term"><em class="parameter"><code>size</code></em></span></dt><dd><p>
     Size of allocation
    </p></dd><dt><span class="term"><em class="parameter"><code>dma_handle</code></em></span></dt><dd><p>
     Out argument for allocated DMA handle
    </p></dd><dt><span class="term"><em class="parameter"><code>gfp</code></em></span></dt><dd><p>
     Allocation flags
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140404962985344"></a><h2>Description</h2><p>
   Managed <code class="function">dma_alloc_coherent</code>.  Memory allocated using this function
   will be automatically released on driver detach.
</p></div><div class="refsect1"><a id="idm140404962983328"></a><h2>RETURNS</h2><p>
   Pointer to allocated memory on success, NULL on failure.
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