Userspace notifier watchdog pretimeout governor, on watchdog pretimeout event sends a notification to userspace for further handling.
Signed-off-by: Vladimir Zapolskiy <[email protected]> --- drivers/watchdog/Kconfig | 14 ++++++++++ drivers/watchdog/Makefile | 1 + drivers/watchdog/pretimeout_userspace.c | 49 +++++++++++++++++++++++++++++++++ 3 files changed, 64 insertions(+) create mode 100644 drivers/watchdog/pretimeout_userspace.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 6c20765..7e9e2bb 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -1655,6 +1655,13 @@ config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC help Use panic watchdog pretimeout governor by default. +config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_USERSPACE + bool "userspace" + select WATCHDOG_PRETIMEOUT_GOV_USERSPACE + help + Use userspace notifier watchdog pretimeout governor + by default. + endchoice config WATCHDOG_PRETIMEOUT_GOV_NOOP @@ -1669,6 +1676,13 @@ config WATCHDOG_PRETIMEOUT_GOV_PANIC Panic watchdog pretimeout governor, on watchdog pretimeout event the kernel shall panic. +config WATCHDOG_PRETIMEOUT_GOV_USERSPACE + tristate "Userspace notifier watchdog pretimeout governor" + help + Userspace notifier watchdog pretimeout governor, on watchdog + pretimeout event send a notification to userspace for + further handling. + endif # WATCHDOG_PRETIMEOUT_GOV endif # WATCHDOG diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index cdcaa8a..7d6755b 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -10,6 +10,7 @@ watchdog-objs += watchdog_core.o watchdog_dev.o watchdog-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV) += watchdog_pretimeout.o obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_NOOP) += pretimeout_noop.o obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_PANIC) += pretimeout_panic.o +obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_USERSPACE) += pretimeout_userspace.o # Only one watchdog can succeed. We probe the ISA/PCI/USB based # watchdog-cards first, then the architecture specific watchdog diff --git a/drivers/watchdog/pretimeout_userspace.c b/drivers/watchdog/pretimeout_userspace.c new file mode 100644 index 0000000..ff3c9e7 --- /dev/null +++ b/drivers/watchdog/pretimeout_userspace.c @@ -0,0 +1,49 @@ +/* + * Copyright (C) 2015 Mentor Graphics + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + */ + +#include <linux/module.h> +#include <linux/watchdog.h> + +#include <watchdog_pretimeout.h> + +/** + * pretimeout_userspace - Notify userspace on watchdog pretimeout event + * @wdd - watchdog_device + * + * Send watchdog device uevent to userspace to handle pretimeout event + */ +static void pretimeout_userspace(struct watchdog_device *wdd) +{ + kobject_uevent(&wdd->dev->kobj, KOBJ_CHANGE); +} + +static struct watchdog_governor watchdog_gov_userspace = { + .name = "userspace", + .pretimeout = pretimeout_userspace, +#ifdef CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_USERSPACE + .is_default = true, +#endif +}; + +static int __init watchdog_gov_userspace_register(void) +{ + return watchdog_register_governor(&watchdog_gov_userspace); +} + +static void __exit watchdog_gov_userspace_unregister(void) +{ + watchdog_unregister_governor(&watchdog_gov_userspace); +} +module_init(watchdog_gov_userspace_register); +module_exit(watchdog_gov_userspace_unregister); + +MODULE_AUTHOR("Vladimir Zapolskiy <[email protected]>"); +MODULE_DESCRIPTION("Userspace notifier watchdog pretimeout governor"); +MODULE_LICENSE("GPL"); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
