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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 >
< 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 >
来访问：（详见
< 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 {
__u32 options; < em class = "hl-comment" > /* Options the card/driver supports */< / em >
__u32 firmware_version; < em class = "hl-comment" > /* Firmware version of the card */< / em >
__u8 identity[< span class = "hl-number" > 32< / span > ]; < em class = "hl-comment" > /* Identity of the board */< / em >
};
#< 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)
#< span class = "hl-directive" > define< / span > WDIOC_GETSTATUS _IOR(WATCHDOG_IOCTL_BASE, < span class = "hl-number" > 1< / span > , < strong class = "hl-keyword" > int< / strong > )
#< span class = "hl-directive" > define< / span > WDIOC_GETBOOTSTATUS _IOR(WATCHDOG_IOCTL_BASE, < span class = "hl-number" > 2< / span > , < strong class = "hl-keyword" > int< / strong > )
#< span class = "hl-directive" > define< / span > WDIOC_GETTEMP _IOR(WATCHDOG_IOCTL_BASE, < span class = "hl-number" > 3< / span > , < strong class = "hl-keyword" > int< / strong > )
#< span class = "hl-directive" > define< / span > WDIOC_SETOPTIONS _IOR(WATCHDOG_IOCTL_BASE, < span class = "hl-number" > 4< / span > , < strong class = "hl-keyword" > int< / strong > )
#< span class = "hl-directive" > define< / span > WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_BASE, < span class = "hl-number" > 5< / span > , < strong class = "hl-keyword" > int< / strong > )
#< span class = "hl-directive" > define< / span > WDIOC_SETTIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, < span class = "hl-number" > 6< / span > , < strong class = "hl-keyword" > int< / strong > )
#< span class = "hl-directive" > define< / span > WDIOC_GETTIMEOUT _IOR(WATCHDOG_IOCTL_BASE, < span class = "hl-number" > 7< / span > , < strong class = "hl-keyword" > int< / strong > )
#< span class = "hl-directive" > define< / span > WDIOC_SETPRETIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, < span class = "hl-number" > 8< / span > , < strong class = "hl-keyword" > int< / strong > )
#< span class = "hl-directive" > define< / span > WDIOC_GETPRETIMEOUT _IOR(WATCHDOG_IOCTL_BASE, < span class = "hl-number" > 9< / span > , < strong class = "hl-keyword" > int< / strong > )
#< 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 >
< 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 >
< / 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 >
< 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
*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（ ） < / 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， < / 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 >
< 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
*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（ ） < / 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， < / 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 >
< 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
*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， < / 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 >
< 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
*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， < / 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，
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.
clr_thd 会和 timeout 一起设置到 Watchdog 控制器。< / td > < / tr > < / tbody > < / table > < / div >
< 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
*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， < / 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） ， < / td > < / tr > < / tbody > < / table > < / div >
< 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
*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， < / 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" >
< 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 >
< / 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， < / 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 >
< div class = "- topic/p p" data-ofbid = "d257796e264__20250121171714" > action 的定义详见
< 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 >
#< 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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