1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>drm_vma_offset_manager_init</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux DRM Developer's Guide"><link rel="up" href="drm-memory-management.html#idp1122718668" title="VMA Offset Manager"><link rel="prev" href="API-drm-gem-mmap.html" title="drm_gem_mmap"><link rel="next" href="API-drm-vma-offset-manager-destroy.html" title="drm_vma_offset_manager_destroy"></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">drm_vma_offset_manager_init</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-drm-gem-mmap.html">Prev</a>&#160;</td><th width="60%" align="center">VMA Offset Manager</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-drm-vma-offset-manager-destroy.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-drm-vma-offset-manager-init"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>drm_vma_offset_manager_init &#8212; 
2  Initialize new offset-manager
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">void <b class="fsfunc">drm_vma_offset_manager_init </b>(</code></td><td>struct drm_vma_offset_manager * <var class="pdparam">mgr</var>, </td></tr><tr><td>&#160;</td><td>unsigned long <var class="pdparam">page_offset</var>, </td></tr><tr><td>&#160;</td><td>unsigned long <var class="pdparam">size</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1122728492"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>mgr</code></em></span></dt><dd><p>
4     Manager object
5    </p></dd><dt><span class="term"><em class="parameter"><code>page_offset</code></em></span></dt><dd><p>
6     Offset of available memory area (page-based)
7    </p></dd><dt><span class="term"><em class="parameter"><code>size</code></em></span></dt><dd><p>
8     Size of available address space range (page-based)
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1122732060"></a><h2>Description</h2><p>
10   Initialize a new offset-manager. The offset and area size available for the
11   manager are given as <em class="parameter"><code>page_offset</code></em> and <em class="parameter"><code>size</code></em>. Both are interpreted as
12   page-numbers, not bytes.
13   </p><p>
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15   Adding/removing nodes from the manager is locked internally and protected
16   against concurrent access. However, node allocation and destruction is left
17   for the caller. While calling into the vma-manager, a given node must
18   always be guaranteed to be referenced.
19</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-drm-gem-mmap.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="drm-memory-management.html#idp1122718668">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-drm-vma-offset-manager-destroy.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">drm_gem_mmap</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">drm_vma_offset_manager_destroy</span></td></tr></table></div></body></html>
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