75 static inline bool watchdog_need_worker(struct watchdog_device *wdd)  in watchdog_need_worker()  argument
78 	unsigned int hm = wdd->max_hw_heartbeat_ms;  in watchdog_need_worker()
79 	unsigned int t = wdd->timeout * 1000;  in watchdog_need_worker()
94 	return (hm && watchdog_active(wdd) && t > hm) ||  in watchdog_need_worker()
95 		(t && !watchdog_active(wdd) && watchdog_hw_running(wdd));  in watchdog_need_worker()
98 static ktime_t watchdog_next_keepalive(struct watchdog_device *wdd)  in watchdog_next_keepalive()  argument
100 	struct watchdog_core_data *wd_data = wdd->wd_data;  in watchdog_next_keepalive()
101 	unsigned int timeout_ms = wdd->timeout * 1000;  in watchdog_next_keepalive()
107 	if (watchdog_active(wdd))  in watchdog_next_keepalive()
113 	hw_heartbeat_ms = min_not_zero(timeout_ms, wdd->max_hw_heartbeat_ms);  in watchdog_next_keepalive()
117 	 * To ensure that the watchdog times out wdd->timeout seconds  in watchdog_next_keepalive()
128 static inline void watchdog_update_worker(struct watchdog_device *wdd)  in watchdog_update_worker()  argument
130 	struct watchdog_core_data *wd_data = wdd->wd_data;  in watchdog_update_worker()
132 	if (watchdog_need_worker(wdd)) {  in watchdog_update_worker()
133 		ktime_t t = watchdog_next_keepalive(wdd);  in watchdog_update_worker()
143 static int __watchdog_ping(struct watchdog_device *wdd)  in __watchdog_ping()  argument
145 	struct watchdog_core_data *wd_data = wdd->wd_data;  in __watchdog_ping()
150 				       ms_to_ktime(wdd->min_hw_heartbeat_ms));  in __watchdog_ping()
162 	if (wdd->ops->ping) {  in __watchdog_ping()
163 		err = wdd->ops->ping(wdd);  /* ping the watchdog */  in __watchdog_ping()
164 		trace_watchdog_ping(wdd, err);  in __watchdog_ping()
166 		err = wdd->ops->start(wdd); /* restart watchdog */  in __watchdog_ping()
167 		trace_watchdog_start(wdd, err);  in __watchdog_ping()
171 		watchdog_hrtimer_pretimeout_start(wdd);  in __watchdog_ping()
173 	watchdog_update_worker(wdd);  in __watchdog_ping()
180  * @wdd: The watchdog device to ping
190 static int watchdog_ping(struct watchdog_device *wdd)  in watchdog_ping()  argument
192 	struct watchdog_core_data *wd_data = wdd->wd_data;  in watchdog_ping()
194 	if (!watchdog_active(wdd) && !watchdog_hw_running(wdd))  in watchdog_ping()
200 	return __watchdog_ping(wdd);  in watchdog_ping()
205 	struct watchdog_device *wdd = wd_data->wdd;  in watchdog_worker_should_ping()  local
207 	if (!wdd)  in watchdog_worker_should_ping()
210 	if (watchdog_active(wdd))  in watchdog_worker_should_ping()
213 	return watchdog_hw_running(wdd) && !watchdog_past_open_deadline(wd_data);  in watchdog_worker_should_ping()
224 		__watchdog_ping(wd_data->wdd);  in watchdog_ping_work()
240  * @wdd: The watchdog device to start
247 static int watchdog_start(struct watchdog_device *wdd)  in watchdog_start()  argument
249 	struct watchdog_core_data *wd_data = wdd->wd_data;  in watchdog_start()
253 	if (watchdog_active(wdd))  in watchdog_start()
259 	if (watchdog_hw_running(wdd) && wdd->ops->ping) {  in watchdog_start()
260 		err = __watchdog_ping(wdd);  in watchdog_start()
262 			set_bit(WDOG_ACTIVE, &wdd->status);  in watchdog_start()
263 			watchdog_hrtimer_pretimeout_start(wdd);  in watchdog_start()
266 		err = wdd->ops->start(wdd);  in watchdog_start()
267 		trace_watchdog_start(wdd, err);  in watchdog_start()
269 			set_bit(WDOG_ACTIVE, &wdd->status);  in watchdog_start()
272 			watchdog_update_worker(wdd);  in watchdog_start()
273 			watchdog_hrtimer_pretimeout_start(wdd);  in watchdog_start()
282  * @wdd: The watchdog device to stop
290 static int watchdog_stop(struct watchdog_device *wdd)  in watchdog_stop()  argument
294 	if (!watchdog_active(wdd))  in watchdog_stop()
297 	if (test_bit(WDOG_NO_WAY_OUT, &wdd->status)) {  in watchdog_stop()
299 			wdd->id);  in watchdog_stop()
303 	if (wdd->ops->stop) {  in watchdog_stop()
304 		clear_bit(WDOG_HW_RUNNING, &wdd->status);  in watchdog_stop()
305 		err = wdd->ops->stop(wdd);  in watchdog_stop()
306 		trace_watchdog_stop(wdd, err);  in watchdog_stop()
308 		set_bit(WDOG_HW_RUNNING, &wdd->status);  in watchdog_stop()
312 		clear_bit(WDOG_ACTIVE, &wdd->status);  in watchdog_stop()
313 		watchdog_update_worker(wdd);  in watchdog_stop()
314 		watchdog_hrtimer_pretimeout_stop(wdd);  in watchdog_stop()
322  * @wdd: The watchdog device to get the status from
329 static unsigned int watchdog_get_status(struct watchdog_device *wdd)  in watchdog_get_status()  argument
331 	struct watchdog_core_data *wd_data = wdd->wd_data;  in watchdog_get_status()
334 	if (wdd->ops->status)  in watchdog_get_status()
335 		status = wdd->ops->status(wdd);  in watchdog_get_status()
337 		status = wdd->bootstatus & (WDIOF_CARDRESET |  in watchdog_get_status()
359  * @wdd:	The watchdog device to set the timeout for
366 static int watchdog_set_timeout(struct watchdog_device *wdd,  in watchdog_set_timeout()  argument
371 	if (!(wdd->info->options & WDIOF_SETTIMEOUT))  in watchdog_set_timeout()
374 	if (watchdog_timeout_invalid(wdd, timeout))  in watchdog_set_timeout()
377 	if (wdd->ops->set_timeout) {  in watchdog_set_timeout()
378 		err = wdd->ops->set_timeout(wdd, timeout);  in watchdog_set_timeout()
379 		trace_watchdog_set_timeout(wdd, timeout, err);  in watchdog_set_timeout()
381 		wdd->timeout = timeout;  in watchdog_set_timeout()
383 		if (wdd->pretimeout >= wdd->timeout)  in watchdog_set_timeout()
384 			wdd->pretimeout = 0;  in watchdog_set_timeout()
387 	watchdog_update_worker(wdd);  in watchdog_set_timeout()
394  * @wdd:	The watchdog device to set the timeout for
399 static int watchdog_set_pretimeout(struct watchdog_device *wdd,  in watchdog_set_pretimeout()  argument
404 	if (!watchdog_have_pretimeout(wdd))  in watchdog_set_pretimeout()
407 	if (watchdog_pretimeout_invalid(wdd, timeout))  in watchdog_set_pretimeout()
410 	if (wdd->ops->set_pretimeout && (wdd->info->options & WDIOF_PRETIMEOUT))  in watchdog_set_pretimeout()
411 		err = wdd->ops->set_pretimeout(wdd, timeout);  in watchdog_set_pretimeout()
413 		wdd->pretimeout = timeout;  in watchdog_set_pretimeout()
420  * @wdd:	The watchdog device to get the remaining time from
428 static int watchdog_get_timeleft(struct watchdog_device *wdd,  in watchdog_get_timeleft()  argument
433 	if (!wdd->ops->get_timeleft)  in watchdog_get_timeleft()
436 	*timeleft = wdd->ops->get_timeleft(wdd);  in watchdog_get_timeleft()
445 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in nowayout_show()  local
448 						  &wdd->status));  in nowayout_show()
454 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in nowayout_store()  local
464 	if (test_bit(WDOG_NO_WAY_OUT, &wdd->status) && !value)  in nowayout_store()
466 	watchdog_set_nowayout(wdd, value);  in nowayout_store()
474 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in status_show()  local
475 	struct watchdog_core_data *wd_data = wdd->wd_data;  in status_show()
479 	status = watchdog_get_status(wdd);  in status_show()
489 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in bootstatus_show()  local
491 	return sysfs_emit(buf, "%u\n", wdd->bootstatus);  in bootstatus_show()
498 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in timeleft_show()  local
499 	struct watchdog_core_data *wd_data = wdd->wd_data;  in timeleft_show()
504 	status = watchdog_get_timeleft(wdd, &val);  in timeleft_show()
516 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in timeout_show()  local
518 	return sysfs_emit(buf, "%u\n", wdd->timeout);  in timeout_show()
525 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in min_timeout_show()  local
527 	return sysfs_emit(buf, "%u\n", wdd->min_timeout);  in min_timeout_show()
534 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in max_timeout_show()  local
536 	return sysfs_emit(buf, "%u\n", wdd->max_timeout);  in max_timeout_show()
543 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in pretimeout_show()  local
545 	return sysfs_emit(buf, "%u\n", wdd->pretimeout);  in pretimeout_show()
552 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in identity_show()  local
554 	return sysfs_emit(buf, "%s\n", wdd->info->identity);  in identity_show()
561 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in state_show()  local
563 	if (watchdog_active(wdd))  in state_show()
581 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in pretimeout_governor_show()  local
583 	return watchdog_pretimeout_governor_get(wdd, buf);  in pretimeout_governor_show()
590 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in pretimeout_governor_store()  local
591 	int ret = watchdog_pretimeout_governor_set(wdd, buf);  in pretimeout_governor_store()
604 	struct watchdog_device *wdd = dev_get_drvdata(dev);  in wdt_is_visible()  local
607 	if (attr == &dev_attr_timeleft.attr && !wdd->ops->get_timeleft)  in wdt_is_visible()
609 	else if (attr == &dev_attr_pretimeout.attr && !watchdog_have_pretimeout(wdd))  in wdt_is_visible()
613 		 (!watchdog_have_pretimeout(wdd) || !IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV)))  in wdt_is_visible()
645  * @wdd: The watchdog device to do the ioctl on
653 static int watchdog_ioctl_op(struct watchdog_device *wdd, unsigned int cmd,  in watchdog_ioctl_op()  argument
656 	if (!wdd->ops->ioctl)  in watchdog_ioctl_op()
659 	return wdd->ops->ioctl(wdd, cmd, arg);  in watchdog_ioctl_op()
679 	struct watchdog_device *wdd;  in watchdog_write()  local
705 	wdd = wd_data->wdd;  in watchdog_write()
706 	if (wdd)  in watchdog_write()
707 		err = watchdog_ping(wdd);  in watchdog_write()
733 	struct watchdog_device *wdd;  in watchdog_ioctl()  local
740 	wdd = wd_data->wdd;  in watchdog_ioctl()
741 	if (!wdd) {  in watchdog_ioctl()
746 	err = watchdog_ioctl_op(wdd, cmd, arg);  in watchdog_ioctl()
752 		err = copy_to_user(argp, wdd->info,  in watchdog_ioctl()
756 		val = watchdog_get_status(wdd);  in watchdog_ioctl()
760 		err = put_user(wdd->bootstatus, p);  in watchdog_ioctl()
768 			err = watchdog_stop(wdd);  in watchdog_ioctl()
773 			err = watchdog_start(wdd);  in watchdog_ioctl()
776 		if (!(wdd->info->options & WDIOF_KEEPALIVEPING)) {  in watchdog_ioctl()
780 		err = watchdog_ping(wdd);  in watchdog_ioctl()
787 		err = watchdog_set_timeout(wdd, val);  in watchdog_ioctl()
793 		err = watchdog_ping(wdd);  in watchdog_ioctl()
799 		if (wdd->timeout == 0) {  in watchdog_ioctl()
803 		err = put_user(wdd->timeout, p);  in watchdog_ioctl()
806 		err = watchdog_get_timeleft(wdd, &val);  in watchdog_ioctl()
816 		err = watchdog_set_pretimeout(wdd, val);  in watchdog_ioctl()
819 		err = put_user(wdd->pretimeout, p);  in watchdog_ioctl()
845 	struct watchdog_device *wdd;  in watchdog_open()  local
860 	wdd = wd_data->wdd;  in watchdog_open()
866 	hw_running = watchdog_hw_running(wdd);  in watchdog_open()
867 	if (!hw_running && !try_module_get(wdd->ops->owner)) {  in watchdog_open()
872 	err = watchdog_start(wdd);  in watchdog_open()
894 	module_put(wd_data->wdd->ops->owner);  in watchdog_open()
923 	struct watchdog_device *wdd;  in watchdog_release()  local
929 	wdd = wd_data->wdd;  in watchdog_release()
930 	if (!wdd)  in watchdog_release()
938 	if (!watchdog_active(wdd))  in watchdog_release()
941 		 !(wdd->info->options & WDIOF_MAGICCLOSE))  in watchdog_release()
942 		err = watchdog_stop(wdd);  in watchdog_release()
946 		pr_crit("watchdog%d: watchdog did not stop!\n", wdd->id);  in watchdog_release()
947 		watchdog_ping(wdd);  in watchdog_release()
950 	watchdog_update_worker(wdd);  in watchdog_release()
956 	running = wdd && watchdog_hw_running(wdd);  in watchdog_release()
993  * @wdd: Watchdog device
1001 static int watchdog_cdev_register(struct watchdog_device *wdd)  in watchdog_cdev_register()  argument
1011 	wd_data->wdd = wdd;  in watchdog_cdev_register()
1012 	wdd->wd_data = wd_data;  in watchdog_cdev_register()
1020 	wd_data->dev.devt = MKDEV(MAJOR(watchdog_devt), wdd->id);  in watchdog_cdev_register()
1022 	wd_data->dev.parent = wdd->parent;  in watchdog_cdev_register()
1023 	wd_data->dev.groups = wdd->groups;  in watchdog_cdev_register()
1025 	dev_set_drvdata(&wd_data->dev, wdd);  in watchdog_cdev_register()
1026 	err = dev_set_name(&wd_data->dev, "watchdog%d", wdd->id);  in watchdog_cdev_register()
1035 	watchdog_hrtimer_pretimeout_init(wdd);  in watchdog_cdev_register()
1037 	if (wdd->id == 0) {  in watchdog_cdev_register()
1039 		watchdog_miscdev.parent = wdd->parent;  in watchdog_cdev_register()
1043 				wdd->info->identity, WATCHDOG_MINOR, err);  in watchdog_cdev_register()
1046 					wdd->info->identity);  in watchdog_cdev_register()
1060 			wdd->id,  MAJOR(watchdog_devt), wdd->id);  in watchdog_cdev_register()
1061 		if (wdd->id == 0) {  in watchdog_cdev_register()
1069 	wd_data->cdev.owner = wdd->ops->owner;  in watchdog_cdev_register()
1079 	if (watchdog_hw_running(wdd)) {  in watchdog_cdev_register()
1080 		__module_get(wdd->ops->owner);  in watchdog_cdev_register()
1087 				wdd->id);  in watchdog_cdev_register()
1095  * @wdd: Watchdog device
1100 static void watchdog_cdev_unregister(struct watchdog_device *wdd)  in watchdog_cdev_unregister()  argument
1102 	struct watchdog_core_data *wd_data = wdd->wd_data;  in watchdog_cdev_unregister()
1105 	if (wdd->id == 0) {  in watchdog_cdev_unregister()
1110 	if (watchdog_active(wdd) &&  in watchdog_cdev_unregister()
1111 	    test_bit(WDOG_STOP_ON_UNREGISTER, &wdd->status)) {  in watchdog_cdev_unregister()
1112 		watchdog_stop(wdd);  in watchdog_cdev_unregister()
1115 	watchdog_hrtimer_pretimeout_stop(wdd);  in watchdog_cdev_unregister()
1118 	wd_data->wdd = NULL;  in watchdog_cdev_unregister()
1119 	wdd->wd_data = NULL;  in watchdog_cdev_unregister()
1130  * @wdd: Watchdog device
1138 int watchdog_dev_register(struct watchdog_device *wdd)  in watchdog_dev_register()  argument
1142 	ret = watchdog_cdev_register(wdd);  in watchdog_dev_register()
1146 	ret = watchdog_register_pretimeout(wdd);  in watchdog_dev_register()
1148 		watchdog_cdev_unregister(wdd);  in watchdog_dev_register()
1155  * @wdd: watchdog device
1160 void watchdog_dev_unregister(struct watchdog_device *wdd)  in watchdog_dev_unregister()  argument
1162 	watchdog_unregister_pretimeout(wdd);  in watchdog_dev_unregister()
1163 	watchdog_cdev_unregister(wdd);  in watchdog_dev_unregister()
1168  * @wdd:		Watchdog device
1179 int watchdog_set_last_hw_keepalive(struct watchdog_device *wdd,  in watchdog_set_last_hw_keepalive()  argument
1185 	if (!wdd)  in watchdog_set_last_hw_keepalive()
1188 	wd_data = wdd->wd_data;  in watchdog_set_last_hw_keepalive()
1194 	if (watchdog_hw_running(wdd) && handle_boot_enabled)  in watchdog_set_last_hw_keepalive()
1195 		return __watchdog_ping(wdd);  in watchdog_set_last_hw_keepalive()
1252 int watchdog_dev_suspend(struct watchdog_device *wdd)  in watchdog_dev_suspend()  argument
1254 	struct watchdog_core_data *wd_data = wdd->wd_data;  in watchdog_dev_suspend()
1257 	if (!wdd->wd_data)  in watchdog_dev_suspend()
1263 		ret = __watchdog_ping(wd_data->wdd);  in watchdog_dev_suspend()
1279 int watchdog_dev_resume(struct watchdog_device *wdd)  in watchdog_dev_resume()  argument
1281 	struct watchdog_core_data *wd_data = wdd->wd_data;  in watchdog_dev_resume()
1284 	if (!wdd->wd_data)  in watchdog_dev_resume()
1293 		ret = __watchdog_ping(wd_data->wdd);  in watchdog_dev_resume()