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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">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/dma/dma-design-guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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<div class="- topic/body concept/conbody body conbody">
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<div class="- topic/div div">
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<p class="- topic/p p" data-ofbid="d79269e35__20250123155205">DMA 源代码位于 <span class="+ topic/ph sw-d/filepath ph filepath">drivers/dma/artinchip-dma.c</span>。</p>
|
||
<p class="- topic/p p" data-ofbid="d79269e41__20250123155205">Linux 提供了一个 DMA Engine 子系统，可封装不同类型的 DMA 控制器驱动，便于 DMA 用户了解硬件细节。</p>
|
||
<div class="- topic/p p" data-ofbid="d79269e44__20250123155205">
|
||
<figure class="- topic/fig fig fignone" id="concept_xwt_1sf_h1c__fig_cdz_kms_c1c" data-ofbid="concept_xwt_1sf_h1c__fig_cdz_kms_c1c">
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<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="concept_xwt_1sf_h1c__image_isk_3ms_c1c" src="../../../images/dma/dma_sw_system_lb.png" alt="sw_system20"/></div><br/>
|
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<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">Linux DMA Engine 子系统架构</span></figcaption></figure>
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</div>
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<div class="- topic/p p" data-ofbid="d79269e59__20250123155205"><a class="- topic/xref xref" href="dma-design-guide.html#concept_xwt_1sf_h1c__fig_cdz_kms_c1c">Linux DMA Engine 子系统架构</a> 展示了 DMA Engine 中的下列组成部分：<ul class="- topic/ul ul" id="concept_xwt_1sf_h1c__ul_jsk_3ms_c1c" data-ofbid="concept_xwt_1sf_h1c__ul_jsk_3ms_c1c">
|
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<li class="- topic/li li" data-ofbid="d79269e66__20250123155205"><strong class="+ topic/ph hi-d/b ph b">DMA Device</strong><ul class="- topic/ul ul" id="concept_xwt_1sf_h1c__ul_tqk_xrt_mdc" data-ofbid="concept_xwt_1sf_h1c__ul_tqk_xrt_mdc">
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<li class="- topic/li li" data-ofbid="d79269e71__20250123155205">对应物理上的一个 Controller。</li>
|
||
<li class="- topic/li li" data-ofbid="d79269e74__20250123155205">DMA Driver 需要提供 Controller 的属性和接口，并注册成为 DMA Device，供后续 DMA Engine
|
||
框架来调用。</li>
|
||
<li class="- topic/li li" data-ofbid="d79269e77__20250123155205">支持注册多个 DMA Device，并使用一个链表 <span class="+ topic/keyword pr-d/parmname keyword parmname">dma_device_list</span>
|
||
来进行管理。</li>
|
||
</ul></li>
|
||
<li class="- topic/li li" data-ofbid="d79269e84__20250123155205"><strong class="+ topic/ph hi-d/b ph b">DMA channel</strong><ul class="- topic/ul ul" id="concept_xwt_1sf_h1c__ul_oqq_2st_mdc" data-ofbid="concept_xwt_1sf_h1c__ul_oqq_2st_mdc">
|
||
<li class="- topic/li li" data-ofbid="d79269e89__20250123155205">对应物理上的 DMA 通道，如图中 DMA Controller 的 Chx。</li>
|
||
<li class="- topic/li li" data-ofbid="d79269e92__20250123155205">物理 DMA 通道也是通过一个链表进行管理，归属于同一个 DMA Device。</li>
|
||
</ul></li>
|
||
<li class="- topic/li li" data-ofbid="d79269e96__20250123155205"><strong class="+ topic/ph hi-d/b ph b">VC（Virtual channel）</strong><ul class="- topic/ul ul" id="concept_xwt_1sf_h1c__ul_upc_gst_mdc" data-ofbid="concept_xwt_1sf_h1c__ul_upc_gst_mdc">
|
||
<li class="- topic/li li" data-ofbid="d79269e101__20250123155205">VC，即虚拟通道</li>
|
||
<li class="- topic/li li" data-ofbid="d79269e104__20250123155205">基于物理的 DMA 通道，DMA Engine 提供了一种 VC。</li>
|
||
<li class="- topic/li li" data-ofbid="d79269e107__20250123155205">VC 数目往往多于物理通道数，比如 VC 有 48 个而物理通道只有 8 个，便于提供一种动态的物理通道分配机制。</li>
|
||
</ul></li>
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<li class="- topic/li li" data-ofbid="d79269e111__20250123155205"><strong class="+ topic/ph hi-d/b ph b">DMA Client</strong><ul class="- topic/ul ul" id="concept_xwt_1sf_h1c__ul_srt_jst_mdc" data-ofbid="concept_xwt_1sf_h1c__ul_srt_jst_mdc">
|
||
<li class="- topic/li li" data-ofbid="d79269e116__20250123155205">DMA 模块的使用者。</li>
|
||
<li class="- topic/li li" data-ofbid="d79269e119__20250123155205">DMA 用户仅限内核中的其他模块，如 SPI、Audio Codec、UART 等。</li>
|
||
<li class="- topic/li li" data-ofbid="d79269e122__20250123155205">暂未提供用户态的使用接口。</li>
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</ul></li>
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