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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/mpp/mpp_config.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">MPP 配置</h1><div class="date inPage">2 Dec 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="mpp_configuration__section_tf1_t1m_4dc" data-ofbid="mpp_configuration__section_tf1_t1m_4dc"><h2 class="- topic/title title sectiontitle">内核配置</h2>
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<div class="- topic/p p" data-ofbid="d186961e27__20250121171628">MPP 依赖 VE 驱动，MPP Heap 内存管理框架，请在 MPP 编译前进行配置。<ol class="- topic/ol ol" id="mpp_configuration__ol_ts4_ffh_d1c" data-ofbid="mpp_configuration__ol_ts4_ffh_d1c"><li class="- topic/li li" data-ofbid="d186961e30__20250121171628">MPP Heap<p class="- topic/p p" data-ofbid="d186961e32__20250121171628">ArtInChip 平台使用 DMA-BUF 来实现多媒体模块间的 buffer 共享。对于 DMA-BUF，Kernel 提供
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System Heap 和 CMA Heap 两个 exporter。 前者直接申请匿名页面，后者则在 CMA
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内存中申请页面。</p><p class="- topic/p p" data-ofbid="d186961e34__20250121171628">虽然通过这两个 exporter
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都能拿到足够的物理连续内存，但它们在系统长时间运行后，都面临内存碎片化问题。特别是在 64 M
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小内存方案中，碎片化问题尤为严重。</p><p class="- topic/p p" data-ofbid="d186961e36__20250121171628">为了解决内存碎片化 的问题，ArtInChip 基于 CMA Heap 进行封装，提供一个私有的
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exporter ，即 MPP Heap 。</p><div class="- topic/p p" data-ofbid="d186961e38__20250121171628">在 Luban 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">make
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kernel-menuconfig</span>，进入 kernel
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的功能配置，按如下选择：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mpp_configuration__codeblock_ik3_qfh_d1c" data-ofbid="mpp_configuration__codeblock_ik3_qfh_d1c">Linux
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Device Drivers --->
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DMABUF options --->
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[*] Explicit Synchronization Framework
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[*] Sync File Validation Framework
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[*] userspace dmabuf misc driver
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[ ] Move notify between drivers (EXPERIMENTAL)
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< > Selftests <strong class="hl-keyword">for</strong> the dma-buf interfaces
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[*] DMA-BUF Userland Memory Heaps --->
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[ ] DMA-BUF System Heap
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[*] DMA-BUF CMA Heap
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[*] DMA-BUF MPP Heap</pre></div><div class="- topic/p p" data-ofbid="d186961e45__20250121171628">MPP Heap 在 CMA
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内存中申请一大块物理连续内存，使用 genpool 算法进行管理，提供给 MPP
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中间件专用，其大小配置：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mpp_configuration__codeblock_hyt_qfh_d1c" data-ofbid="mpp_configuration__codeblock_hyt_qfh_d1c">Linux
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Library routines --->
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[*] DMA Contiguous Memory Allocator
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[ ] Enable separate DMA Contiguous Memory Area <strong class="hl-keyword">for</strong> each NUMA Node
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*** Default contiguous memory area size: ***
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(<span class="hl-number">16</span>) Size in Mega Bytes
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(<span class="hl-number">8</span>) Size in Mega Bytes <strong class="hl-keyword">for</strong> MPP Heap</pre></div><p class="- topic/p p" data-ofbid="d186961e49__20250121171628">在上述例子中，系统预留了
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16M CMA 内存，MPP Heap 再从 16M CMA 内存中申请 8M。</p><p class="- topic/p p" data-ofbid="d186961e51__20250121171628">因为 MPP Heap 的内存是从 CMA
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中申请的，前者是后者的子集，所以 MPP Heap 的 size 要小于 CMA 的 size。</p><div class="- topic/note note note note_note" id="mpp_configuration__note_zgz_qfh_d1c" data-ofbid="mpp_configuration__note_zgz_qfh_d1c"><span class="note__title">注：</span>
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<p class="- topic/p p" data-ofbid="d186961e55__20250121171628">为了兼顾系统中其他需要物理连续内存的模块，不能将 CMA 内存全部分配给 MPP Heap，分配数值设置可参考 。</p>
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</div></li><li class="- topic/li li" data-ofbid="d186961e58__20250121171628">VE 驱动<p class="- topic/p p" data-ofbid="d186961e60__20250121171628">关于 VE 模块驱动配置，详见 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="../ve/ve-config.html">VE 配置</a>。</p></li></ol></div>
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</section><section class="- topic/section section" id="mpp_configuration__section_bl2_t1m_4dc" data-ofbid="mpp_configuration__section_bl2_t1m_4dc"><h2 class="- topic/title title sectiontitle">DTS 参数配置</h2>
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<p class="- topic/p p" data-ofbid="d186961e72__20250121171628">关于 VE 模块 DTS 配置，详见 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="../ve/ve-config.html">VE 配置</a>。</p>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#mpp_configuration__section_tf1_t1m_4dc" data-tocid="mpp_configuration__section_tf1_t1m_4dc">内核配置</a></div></li><li class="section-item"><div class="section-title"><a href="#mpp_configuration__section_bl2_t1m_4dc" data-tocid="mpp_configuration__section_bl2_t1m_4dc">DTS 参数配置</a></div></li></ul></div>
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