Userspace notifier watchdog pretimeout governor, on watchdog
pretimeout event sends a notification to userspace for further
handling.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>
---
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 <vladimir_zapolskiy@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Userspace notifier watchdog pretimeout governor");
+MODULE_LICENSE("GPL");
--
2.1.4
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