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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/watchdog/watchdog-interface-design.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">接口设计</h1><div class="date inPage">15 Jul 2024</div><div style="color: gray;">
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Read time: 3 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d257796e22__20250121171714">以下接口是 Linux Watchdog 子系统需要的标准接口。</p><section class="- topic/section section" id="Watchdog_interface_design__section_vvn_1gt_c1c" data-ofbid="Watchdog_interface_design__section_vvn_1gt_c1c"><h2 class="- topic/title title sectiontitle">外部接口</h2>
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<div class="- topic/p p" data-ofbid="d257796e29__20250121171714">Linux 对用户态提供了一组 Watchdog 的 ioctl 接口，用户态可以通过设备节点 <span class="+ topic/ph sw-d/filepath ph filepath">/dev/watchdogX</span>
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来访问：（详见
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<span class="+ topic/ph sw-d/filepath ph filepath">include/upai/linux/watchdog.h</span>）<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="Watchdog_interface_design__codeblock_vrx_bgt_c1c" data-ofbid="Watchdog_interface_design__codeblock_vrx_bgt_c1c"><strong class="hl-keyword">struct</strong> watchdog_info {
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__u32 options; <em class="hl-comment">/* Options the card/driver supports */</em>
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__u32 firmware_version; <em class="hl-comment">/* Firmware version of the card */</em>
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__u8 identity[<span class="hl-number">32</span>]; <em class="hl-comment">/* Identity of the board */</em>
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};
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#<span class="hl-directive">define</span> WDIOC_GETSUPPORT _IOR(WATCHDOG_IOCTL_BASE, <span class="hl-number">0</span>, <strong class="hl-keyword">struct</strong> watchdog_info)
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#<span class="hl-directive">define</span> WDIOC_GETSTATUS _IOR(WATCHDOG_IOCTL_BASE, <span class="hl-number">1</span>, <strong class="hl-keyword">int</strong>)
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#<span class="hl-directive">define</span> WDIOC_GETBOOTSTATUS _IOR(WATCHDOG_IOCTL_BASE, <span class="hl-number">2</span>, <strong class="hl-keyword">int</strong>)
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#<span class="hl-directive">define</span> WDIOC_GETTEMP _IOR(WATCHDOG_IOCTL_BASE, <span class="hl-number">3</span>, <strong class="hl-keyword">int</strong>)
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#<span class="hl-directive">define</span> WDIOC_SETOPTIONS _IOR(WATCHDOG_IOCTL_BASE, <span class="hl-number">4</span>, <strong class="hl-keyword">int</strong>)
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#<span class="hl-directive">define</span> WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_BASE, <span class="hl-number">5</span>, <strong class="hl-keyword">int</strong>)
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#<span class="hl-directive">define</span> WDIOC_SETTIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, <span class="hl-number">6</span>, <strong class="hl-keyword">int</strong>)
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#<span class="hl-directive">define</span> WDIOC_GETTIMEOUT _IOR(WATCHDOG_IOCTL_BASE, <span class="hl-number">7</span>, <strong class="hl-keyword">int</strong>)
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#<span class="hl-directive">define</span> WDIOC_SETPRETIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, <span class="hl-number">8</span>, <strong class="hl-keyword">int</strong>)
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#<span class="hl-directive">define</span> WDIOC_GETPRETIMEOUT _IOR(WATCHDOG_IOCTL_BASE, <span class="hl-number">9</span>, <strong class="hl-keyword">int</strong>)
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#<span class="hl-directive">define</span> WDIOC_GETTIMELEFT _IOR(WATCHDOG_IOCTL_BASE, <span class="hl-number">10</span>, <strong class="hl-keyword">int</strong>)</pre></div>
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<p class="- topic/p p" data-ofbid="d257796e40__20250121171714"><a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="watchdog-demo.html">Demo</a> 就是调用的这些接口 Watchdog 的访问。</p>
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</section><section class="- topic/section section" id="Watchdog_interface_design__section_jcj_lgt_c1c" data-ofbid="Watchdog_interface_design__section_jcj_lgt_c1c"><h2 class="- topic/title title sectiontitle">内部接口</h2>
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<div class="table-container"><table class="- topic/table table frame-all" id="Watchdog_interface_design__table_jck_jgt_c1c" data-ofbid="Watchdog_interface_design__table_jck_jgt_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_wdt_start</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="Watchdog_interface_design__table_jck_jgt_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="Watchdog_interface_design__table_jck_jgt_c1c__entry__2">static int aic_wdt_start(struct watchdog_device
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*wdt_dev)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_jck_jgt_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_jck_jgt_c1c__entry__2">使能一个 Watchdog 通道（device）</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_jck_jgt_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_jck_jgt_c1c__entry__2">wdt_dev - 指向 Watchdog 设备的指针</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_jck_jgt_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_jck_jgt_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="Watchdog_interface_design__table_jck_jgt_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="Watchdog_interface_design__table_jck_jgt_c1c__entry__2">如果当前通道的 Watchdog 已经是使能状态，将执行 ping 操作（喂狗）。</td></tr></tbody></table></div>
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<div class="table-container"><table class="- topic/table table frame-all" id="Watchdog_interface_design__table_kck_jgt_c1c" data-ofbid="Watchdog_interface_design__table_kck_jgt_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 2</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_wdt_stop</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="Watchdog_interface_design__table_kck_jgt_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="Watchdog_interface_design__table_kck_jgt_c1c__entry__2">static int aic_wdt_stop(struct watchdog_device
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*wdt_dev)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_kck_jgt_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_kck_jgt_c1c__entry__2">关闭一个 Watchdog 通道（device）</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_kck_jgt_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_kck_jgt_c1c__entry__2">wdt_dev - 指向 Watchdog 设备的指针</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_kck_jgt_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_kck_jgt_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="Watchdog_interface_design__table_kck_jgt_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="Watchdog_interface_design__table_kck_jgt_c1c__entry__2">-</td></tr></tbody></table></div>
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<div class="table-container"><table class="- topic/table table frame-all" id="Watchdog_interface_design__table_lck_jgt_c1c" data-ofbid="Watchdog_interface_design__table_lck_jgt_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 3</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_wdt_pin</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="Watchdog_interface_design__table_lck_jgt_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="Watchdog_interface_design__table_lck_jgt_c1c__entry__2">static int aic_wdt_ping(struct watchdog_device
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*wdt_dev)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_lck_jgt_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_lck_jgt_c1c__entry__2">清零指定的 Watchdog 通道计数器，相当于“喂狗”操作</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_lck_jgt_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_lck_jgt_c1c__entry__2">wdt_dev - 指向 Watchdog 设备的指针</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_lck_jgt_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_lck_jgt_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="Watchdog_interface_design__table_lck_jgt_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="Watchdog_interface_design__table_lck_jgt_c1c__entry__2">需要先调用 aic_wdt_start()，再调用此接口</td></tr></tbody></table></div>
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<div class="table-container"><table class="- topic/table table frame-all" id="Watchdog_interface_design__table_mck_jgt_c1c" data-ofbid="Watchdog_interface_design__table_mck_jgt_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 4</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_wdt_set_timeout</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="Watchdog_interface_design__table_mck_jgt_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="Watchdog_interface_design__table_mck_jgt_c1c__entry__2">static int aic_wdt_set_timeout(struct watchdog_device
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*wdt_dev, unsigned int timeout)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_mck_jgt_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_mck_jgt_c1c__entry__2">给指定的 Watchdog 设备设置一个超时</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_mck_jgt_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_mck_jgt_c1c__entry__2">wdt_dev - 指向 Watchdog 设备的指针 timetout - 超时的数值，单位：秒</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_mck_jgt_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_mck_jgt_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="Watchdog_interface_design__table_mck_jgt_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="Watchdog_interface_design__table_mck_jgt_c1c__entry__2">1. 在 Watchdog 初始化时配置的最大、最小 timeout 参数，Watchdog
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Core 会去做校验，如果超出范围，将采用上一次有效的 timeout 参数值。2.
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clr_thd 会和 timeout 一起设置到 Watchdog 控制器。</td></tr></tbody></table></div>
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<div class="table-container"><table class="- topic/table table frame-all" id="Watchdog_interface_design__table_nck_jgt_c1c" data-ofbid="Watchdog_interface_design__table_nck_jgt_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 5</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_wdt_set_pretimeout</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="Watchdog_interface_design__table_nck_jgt_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="Watchdog_interface_design__table_nck_jgt_c1c__entry__2">static int aic_wdt_set_pretimeout(struct watchdog_device
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*wdt_dev,unsigned int pretimeout)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_nck_jgt_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_nck_jgt_c1c__entry__2">给指定的 Watchdog 设备设置一个预超时</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_nck_jgt_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_nck_jgt_c1c__entry__2">wdt_dev - 指向 Watchdog 设备的指针 pretimetout - 预超时的数值，单位：秒</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_nck_jgt_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_nck_jgt_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="Watchdog_interface_design__table_nck_jgt_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="Watchdog_interface_design__table_nck_jgt_c1c__entry__2">pretimeout 必须要小于该 Watchdog 通道的 timeout 参数，这个有效性检查会在 Core 中去做（所以合理的 ioctl 操作是先设置 timeout、再设置 pretimeout），如果 pretimeout 无效将返回出错。</td></tr></tbody></table></div>
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<div class="table-container"><table class="- topic/table table frame-all" id="Watchdog_interface_design__table_pck_jgt_c1c" data-ofbid="Watchdog_interface_design__table_pck_jgt_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 6</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_wdt_restart</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="Watchdog_interface_design__table_pck_jgt_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="Watchdog_interface_design__table_pck_jgt_c1c__entry__2">static int aic_wdt_restart(struct watchdog_device
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*wdt_dev,unsigned long action, void *data)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_pck_jgt_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_pck_jgt_c1c__entry__2">用于重启整个系统（方法是设置 timeout 是 0，Watchdog 会立即触发超时重启）</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_pck_jgt_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_pck_jgt_c1c__entry__2">
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<ul class="- topic/ul ul" id="Watchdog_interface_design__ul_djq_nmj_bcc" data-ofbid="Watchdog_interface_design__ul_djq_nmj_bcc"><li class="- topic/li li" data-ofbid="d257796e246__20250121171714">wdt_dev - 指向 Watchdog 设备的指针 </li><li class="- topic/li li" data-ofbid="d257796e248__20250121171714">action - 需要执行的操作类型（定义详见“注意事项”），目前统一按重启处理 </li><li class="- topic/li li" data-ofbid="d257796e250__20250121171714">data - 附加数据，暂未用到</li></ul>
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</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="Watchdog_interface_design__table_pck_jgt_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="Watchdog_interface_design__table_pck_jgt_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="Watchdog_interface_design__table_pck_jgt_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="Watchdog_interface_design__table_pck_jgt_c1c__entry__2">-</td></tr></tbody></table></div>
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<div class="- topic/p p" data-ofbid="d257796e264__20250121171714">action 的定义详见
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||
<span class="+ topic/ph sw-d/filepath ph filepath">include/linux/reboot.h</span>：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="Watchdog_interface_design__codeblock_cfm_sgt_c1c" data-ofbid="Watchdog_interface_design__codeblock_cfm_sgt_c1c">#<span class="hl-directive">define</span> SYS_DOWN <span class="hl-number">0x0001</span> <em class="hl-comment">/* Notify of system down */</em>
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||
#<span class="hl-directive">define</span> SYS_RESTART SYS_DOWN
|
||
#<span class="hl-directive">define</span> SYS_HALT <span class="hl-number">0x0002</span> <em class="hl-comment">/* Notify of system halt */</em>
|
||
#<span class="hl-directive">define</span> SYS_POWER_OFF <span class="hl-number">0x0003</span> <em class="hl-comment">/* Notify of system power off */</em></pre></div>
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