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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/ge/ge_normal_mode.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">非命令队列模式</h1><div class="date inPage">4 Dec 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d333764e23__20250121171837">非命令队列模式，即 normal 模式。</p><div class="- topic/p p" data-ofbid="d333764e25__20250121171837">GE normal 模式的控制流程如下所示：<ul class="- topic/ul ul" id="ge_normal_mode__ul_stj_lx4_bcc" data-ofbid="ge_normal_mode__ul_stj_lx4_bcc"><li class="- topic/li li" data-ofbid="d333764e28__20250121171837">当用户态通过 open 函数打开 /dev/ge 设备节点，会调用到驱动中的 open。</li><li class="- topic/li li" data-ofbid="d333764e30__20250121171837">当用户通过 close 关闭驱动时，会调用到驱动中的 release。</li><li class="- topic/li li" data-ofbid="d333764e32__20250121171837">在 open 中主要是实现了模块 clock 的打开操作， 在 release 中实现了模块 clock 的关闭操作。</li><li class="- topic/li li" data-ofbid="d333764e34__20250121171837">当用户态有多个用户打开 GE 驱动时，对驱动打开次数进行引用计数。</li><li class="- topic/li li" data-ofbid="d333764e36__20250121171837">至少有一个用户打开 GE 驱动时打开 GE 的 clock。</li><li class="- topic/li li" data-ofbid="d333764e38__20250121171837">当所有的用户都关闭 GE 驱动时关闭 GE 的 clock。 </li></ul></div><div class="- topic/p p" data-ofbid="d333764e40__20250121171837">
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<figure class="- topic/fig fig fignone" id="ge_normal_mode__fig_uvv_gbb_d1c" data-ofbid="ge_normal_mode__fig_uvv_gbb_d1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="ge_normal_mode__image_bvc_hbb_d1c" src="../../../images/ge/ge_sw_normal.png" alt="ge_sw_normal"/></div><br/><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">非命令队列模式架构</span></figcaption></figure>
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</div><div class="- topic/p p" data-ofbid="d333764e49__20250121171837">在 Normal 模式下，用户态可用 <span class="+ topic/keyword pr-d/apiname keyword apiname">ioctl</span> 控制 GE，包括以下几种操作：<ul class="- topic/ul ul" id="ge_normal_mode__ul_d2l_jbb_d1c" data-ofbid="ge_normal_mode__ul_d2l_jbb_d1c"><li class="- topic/li li" data-ofbid="d333764e55__20250121171837">
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<p class="- topic/p p" data-ofbid="d333764e57__20250121171837"><span class="+ topic/keyword pr-d/apiname keyword apiname">IOC_GE_VERSION</span></p>
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</li><li class="- topic/li li" data-ofbid="d333764e61__20250121171837">
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<p class="- topic/p p" data-ofbid="d333764e63__20250121171837"><span class="+ topic/keyword pr-d/apiname keyword apiname">IOC_GE_MODE</span></p>
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</li><li class="- topic/li li" data-ofbid="d333764e67__20250121171837">
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<p class="- topic/p p" data-ofbid="d333764e69__20250121171837"><span class="+ topic/keyword pr-d/apiname keyword apiname">IOC_GE_FILLRECT</span></p>
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</li><li class="- topic/li li" data-ofbid="d333764e73__20250121171837">
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<p class="- topic/p p" data-ofbid="d333764e75__20250121171837"><span class="+ topic/keyword pr-d/apiname keyword apiname">IOC_GE_BITBLT</span></p>
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</li><li class="- topic/li li" data-ofbid="d333764e79__20250121171837">
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<p class="- topic/p p" data-ofbid="d333764e81__20250121171837"><span class="+ topic/keyword pr-d/apiname keyword apiname">IOC_GE_ROTATE</span></p>
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</li></ul></div><p class="- topic/p p" data-ofbid="d333764e85__20250121171837">在 normal 模式下，对
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<span class="+ topic/keyword pr-d/apiname keyword apiname">IOC_GE_FILLRECT</span>、<span class="+ topic/keyword pr-d/apiname keyword apiname">IOC_GE_BITBLT</span>、<span class="+ topic/keyword pr-d/apiname keyword apiname">IOC_GE_ROTATE</span>
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接口的调用是同步的，即硬件执行任务完成后接口调用才会返回。 </p><section class="- topic/section section" id="ge_normal_mode__section_bq5_vpr_ndc" data-ofbid="ge_normal_mode__section_bq5_vpr_ndc"><h2 class="- topic/title title sectiontitle">GE 控制函数</h2>
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<div class="- topic/p p" data-ofbid="d333764e101__20250121171837">
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<ul class="- topic/ul ul" id="ge_normal_mode__ul_uz4_nqr_ndc" data-ofbid="ge_normal_mode__ul_uz4_nqr_ndc"><li class="- topic/li li" data-ofbid="d333764e104__20250121171837">
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<div class="- topic/p p" data-ofbid="d333764e106__20250121171837"><strong class="+ topic/ph hi-d/b ph b">函数 <span class="+ topic/keyword pr-d/apiname keyword apiname">ge_open</span></strong>：打开
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GE<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="ge_normal_mode__codeblock_vvs_4qr_ndc" data-ofbid="ge_normal_mode__codeblock_vvs_4qr_ndc"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> ge_open(<strong class="hl-keyword">struct</strong> inode *inode, <strong class="hl-keyword">struct</strong> file *file)
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{
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mutex_lock(&g_data->lock);
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<strong class="hl-keyword">if</strong> (g_data->refs == <span class="hl-number">0</span>) {
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ge_clk_enable(g_data);
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}
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g_data->refs++;
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mutex_unlock(&g_data->lock);
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<strong class="hl-keyword">return</strong> nonseekable_open(inode, file);
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}
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</pre></div>
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</li><li class="- topic/li li" data-ofbid="d333764e115__20250121171837">
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<div class="- topic/p p" data-ofbid="d333764e117__20250121171837"><strong class="+ topic/ph hi-d/b ph b">函数 <span class="+ topic/keyword pr-d/apiname keyword apiname">ge_release</span></strong>：关闭
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GE<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="ge_normal_mode__codeblock_ny3_3bb_d1c" data-ofbid="ge_normal_mode__codeblock_ny3_3bb_d1c"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> ge_release(<strong class="hl-keyword">struct</strong> inode *inode, <strong class="hl-keyword">struct</strong> file *file)
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{
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mutex_lock(&g_data->lock);
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<strong class="hl-keyword">if</strong> (g_data->refs == <span class="hl-number">1</span>) {
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ge_clk_disable(g_data);
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}
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g_data->refs--;
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mutex_unlock(&g_data->lock);
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<strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
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}</pre></div>
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</li></ul>
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</div>
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</section><section class="- topic/section section" id="ge_normal_mode__section_z4j_qbb_d1c" data-ofbid="ge_normal_mode__section_z4j_qbb_d1c"><h2 class="- topic/title title sectiontitle">关键流程设计</h2>
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<p class="- topic/p p" data-ofbid="d333764e135__20250121171837">在 GE normal 模式下，GE 驱动各种功能通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">ioctrl</span> 调用实现。</p>
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<div class="- topic/p p" data-ofbid="d333764e141__20250121171837">每一次 <span class="+ topic/keyword pr-d/apiname keyword apiname">ioctrl</span> 的调用，都包括以下步骤：<ol class="- topic/ol ol" id="ge_normal_mode__ol_nnr_smz_2dc" data-ofbid="ge_normal_mode__ol_nnr_smz_2dc"><li class="- topic/li li" data-ofbid="d333764e147__20250121171837">GE 参数配置。</li><li class="- topic/li li" data-ofbid="d333764e149__20250121171837">GE 模块中断开启。</li><li class="- topic/li li" data-ofbid="d333764e151__20250121171837">GE 硬件启动。</li><li class="- topic/li li" data-ofbid="d333764e153__20250121171837">GE 等待中断，当前线程进入等待状态，直到收到中断通知。</li><li class="- topic/li li" data-ofbid="d333764e155__20250121171837">硬件完成任务后，关闭中断。</li></ol>
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</div>
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<p class="- topic/p p" data-ofbid="d333764e159__20250121171837"><span class="+ topic/keyword pr-d/apiname keyword apiname">ioctrl</span> 通过 mutex 保护， 确保多线程环境下的安全性。在 normal 模式下，支持多用户同时打开驱动设备节点，并调用
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<span class="+ topic/keyword pr-d/apiname keyword apiname">ioctrl</span>。</p>
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<figure class="- topic/fig fig fignone" id="ge_normal_mode__fig_elx_qbb_d1c" data-ofbid="ge_normal_mode__fig_elx_qbb_d1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="ge_normal_mode__image_apj_qbb_d1c" src="../../../images/ge/ge_sw_normal_interrupt.png" alt="normal_interrupt"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">Normal 模式中断流程</span></figcaption></figure>
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<div class="- topic/p p" data-ofbid="d333764e175__20250121171837">等待中断流程：<ul class="- topic/ul ul" id="ge_normal_mode__ul_v1k_hpm_f1c" data-ofbid="ge_normal_mode__ul_v1k_hpm_f1c"><li class="- topic/li li" data-ofbid="d333764e178__20250121171837">
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<p class="- topic/p p" data-ofbid="d333764e180__20250121171837">在执行 <span class="+ topic/keyword pr-d/apiname keyword apiname">probe</span>
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时初始化等待队列：<span class="+ topic/keyword pr-d/apiname keyword apiname">init_waitqueue_head(&data->wait)</span>。</p>
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</li><li class="- topic/li li" data-ofbid="d333764e189__20250121171837">
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<p class="- topic/p p" data-ofbid="d333764e191__20250121171837">在 <span class="+ topic/keyword pr-d/apiname keyword apiname">ioctl</span> 中调用如下函数，使当前进程在等待队列中睡眠：</p>
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<p class="- topic/p p" data-ofbid="d333764e197__20250121171837"><span class="+ topic/keyword pr-d/apiname keyword apiname">wait_event_timeout(data->wait, data->status,
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msecs_to_jiffies(GE_TIMEOUT_MS))</span>。</p>
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</li><li class="- topic/li li" data-ofbid="d333764e202__20250121171837">
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<p class="- topic/p p" data-ofbid="d333764e204__20250121171837">在中断服务程序中调用 <span class="+ topic/keyword pr-d/apiname keyword apiname">wake_up(&data->wait)</span>，唤醒等待队列中的睡眠进程。</p>
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</li></ul></div>
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</section></div></article></main></div>
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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="#ge_normal_mode__section_bq5_vpr_ndc" data-tocid="ge_normal_mode__section_bq5_vpr_ndc">GE 控制函数</a></div></li><li class="section-item"><div class="section-title"><a href="#ge_normal_mode__section_z4j_qbb_d1c" data-tocid="ge_normal_mode__section_z4j_qbb_d1c">关键流程设计</a></div></li></ul></div>
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<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
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</body>
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</html> |