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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>dma_buf_mmap</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-buf-kunmap.html" title="dma_buf_kunmap" /><link rel="next" href="API-dma-buf-vmap.html" title="dma_buf_vmap" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">dma_buf_mmap</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-dma-buf-kunmap.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-dma-buf-vmap.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-dma-buf-mmap"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>dma_buf_mmap &#8212; 
     Setup up a userspace mmap with the given vma
 </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">dma_buf_mmap </strong>(</code></td><td>struct dma_buf * <var class="pdparam">dmabuf</var>, </td></tr><tr><td>&#160;</td><td>struct vm_area_struct * <var class="pdparam">vma</var>, </td></tr><tr><td>&#160;</td><td>unsigned long <var class="pdparam">pgoff</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140404963128272"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>dmabuf</code></em></span></dt><dd><p>
     [in]	buffer that should back the vma
    </p></dd><dt><span class="term"><em class="parameter"><code>vma</code></em></span></dt><dd><p>
     [in]	vma for the mmap
    </p></dd><dt><span class="term"><em class="parameter"><code>pgoff</code></em></span></dt><dd><p>
     [in]	offset in pages where this mmap should start within the
     dma-buf buffer.
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140404963120992"></a><h2>Description</h2><p>
   This function adjusts the passed in vma so that it points at the file of the
   dma_buf operation. It alsog adjusts the starting pgoff and does bounds
   checking on the size of the vma. Then it calls the exporters mmap function to
   set up the mapping.
   </p><p>

   Can return negative error values, returns 0 on success.
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