watchdog: pretimeout: add noop pretimeout governor
The change adds noop watchdog pretimeout governor, only an informational message is printed to the kernel log buffer when a watchdog triggers a pretimeout event. While introducing the first pretimeout governor the selected design assumes that the default pretimeout governor is selected by its name and it is always built-in, thus the default pretimeout governor can not be unregistered and the correspondent check can be removed from the watchdog_unregister_governor() function. Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>steinar/wifi_calib_4_9_kernel
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@ -1838,4 +1838,32 @@ config WATCHDOG_PRETIMEOUT_GOV
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help
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help
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The option allows to select watchdog pretimeout governors.
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The option allows to select watchdog pretimeout governors.
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if WATCHDOG_PRETIMEOUT_GOV
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choice
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prompt "Default Watchdog Pretimeout Governor"
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default WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC
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help
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This option selects a default watchdog pretimeout governor.
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The governor takes its action, if a watchdog is capable
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to report a pretimeout event.
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config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP
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bool "noop"
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select WATCHDOG_PRETIMEOUT_GOV_NOOP
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help
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Use noop watchdog pretimeout governor by default. If noop
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governor is selected by a user, write a short message to
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the kernel log buffer and don't do any system changes.
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endchoice
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config WATCHDOG_PRETIMEOUT_GOV_NOOP
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tristate "Noop watchdog pretimeout governor"
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help
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Noop watchdog pretimeout governor, only an informational
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message is added to kernel log buffer.
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endif # WATCHDOG_PRETIMEOUT_GOV
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endif # WATCHDOG
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endif # WATCHDOG
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@ -9,6 +9,8 @@ watchdog-objs += watchdog_core.o watchdog_dev.o
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watchdog-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV) += watchdog_pretimeout.o
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watchdog-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV) += watchdog_pretimeout.o
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obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_NOOP) += pretimeout_noop.o
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# Only one watchdog can succeed. We probe the ISA/PCI/USB based
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# Only one watchdog can succeed. We probe the ISA/PCI/USB based
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# watchdog-cards first, then the architecture specific watchdog
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# watchdog-cards first, then the architecture specific watchdog
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# drivers and then the architecture independent "softdog" driver.
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# drivers and then the architecture independent "softdog" driver.
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@ -0,0 +1,47 @@
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/*
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* Copyright (C) 2015-2016 Mentor Graphics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/printk.h>
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#include <linux/watchdog.h>
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#include "watchdog_pretimeout.h"
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/**
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* pretimeout_noop - No operation on watchdog pretimeout event
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* @wdd - watchdog_device
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*
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* This function prints a message about pretimeout to kernel log.
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*/
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static void pretimeout_noop(struct watchdog_device *wdd)
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{
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pr_alert("watchdog%d: pretimeout event\n", wdd->id);
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}
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static struct watchdog_governor watchdog_gov_noop = {
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.name = "noop",
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.pretimeout = pretimeout_noop,
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};
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static int __init watchdog_gov_noop_register(void)
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{
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return watchdog_register_governor(&watchdog_gov_noop);
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}
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static void __exit watchdog_gov_noop_unregister(void)
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{
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watchdog_unregister_governor(&watchdog_gov_noop);
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}
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module_init(watchdog_gov_noop_register);
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module_exit(watchdog_gov_noop_unregister);
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MODULE_AUTHOR("Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>");
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MODULE_DESCRIPTION("Panic watchdog pretimeout governor");
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MODULE_LICENSE("GPL");
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@ -20,6 +20,10 @@ int watchdog_register_pretimeout(struct watchdog_device *wdd);
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void watchdog_unregister_pretimeout(struct watchdog_device *wdd);
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void watchdog_unregister_pretimeout(struct watchdog_device *wdd);
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int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf);
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int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf);
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#if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP)
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#define WATCHDOG_PRETIMEOUT_DEFAULT_GOV "noop"
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#endif
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#else
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#else
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static inline int watchdog_register_pretimeout(struct watchdog_device *wdd)
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static inline int watchdog_register_pretimeout(struct watchdog_device *wdd)
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{
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{
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