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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>snd_pcm_lib_preallocate_pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="The ALSA Driver API" /><link rel="up" href="ch02s03.html" title="PCM Memory Management" /><link rel="prev" href="API-snd-pcm-lib-preallocate-free-for-all.html" title="snd_pcm_lib_preallocate_free_for_all" /><link rel="next" href="API-snd-pcm-lib-preallocate-pages-for-all.html" title="snd_pcm_lib_preallocate_pages_for_all" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">snd_pcm_lib_preallocate_pages</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-snd-pcm-lib-preallocate-free-for-all.html">Prev</a>&#160;</td><th width="60%" align="center">PCM Memory Management</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-snd-pcm-lib-preallocate-pages-for-all.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-snd-pcm-lib-preallocate-pages"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>snd_pcm_lib_preallocate_pages &#8212; 
     pre-allocation for the given DMA type
 </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 <strong class="fsfunc">snd_pcm_lib_preallocate_pages </strong>(</code></td><td>struct snd_pcm_substream * <var class="pdparam">substream</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">type</var>, </td></tr><tr><td>&#160;</td><td>struct device * <var class="pdparam">data</var>, </td></tr><tr><td>&#160;</td><td>size_t <var class="pdparam">size</var>, </td></tr><tr><td>&#160;</td><td>size_t <var class="pdparam">max</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140249670258304"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>substream</code></em></span></dt><dd><p>
     the pcm substream instance
    </p></dd><dt><span class="term"><em class="parameter"><code>type</code></em></span></dt><dd><p>
     DMA type (SNDRV_DMA_TYPE_*)
    </p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
     DMA type dependent data
    </p></dd><dt><span class="term"><em class="parameter"><code>size</code></em></span></dt><dd><p>
     the requested pre-allocation size in bytes
    </p></dd><dt><span class="term"><em class="parameter"><code>max</code></em></span></dt><dd><p>
     the max. allowed pre-allocation size
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140249670247632"></a><h2>Description</h2><p>
   Do pre-allocation for the given DMA buffer type.
   </p><p>

   When substream-&gt;dma_buf_id is set, the function tries to look for
   the reserved buffer, and the buffer is not freed but reserved at
   destruction time.  The dma_buf_id must be unique for all systems
   (in the same DMA buffer type) e.g. using <code class="function">snd_dma_pci_buf_id</code>.
</p></div><div class="refsect1"><a id="idm140249670244960"></a><h2>Return</h2><p>
   Zero if successful, or a negative error code on failure.
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