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authorVladimir Zapolskiy <vladimir_zapolskiy@mentor.com>2016-10-07 15:39:56 +0300
committerWim Van Sebroeck <wim@iguana.be>2016-10-08 10:27:17 +0200
commitda0d12ff2b829a35e9921918e925d79497b82bef (patch)
tree6c72ee5f9d3b26a9cb23baed655545b52559aba4 /drivers/watchdog
parentf77710c4cda01ad9c3672fb2f97bdea9a94da92a (diff)
downloadlinux-da0d12ff2b829a35e9921918e925d79497b82bef.tar.bz2
watchdog: pretimeout: add panic pretimeout governor
The change adds panic watchdog pretimeout governor, on watchdog pretimeout event the kernel shall panic. In general watchdog pretimeout event means that something essentially bad is going on the system, for example a process scheduler stalls or watchdog feeder is killed due to OOM, so printing out information attendant to panic and before likely unavoidable reboot caused by a watchdog may help to determine a root cause of the issue. 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>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/Kconfig14
-rw-r--r--drivers/watchdog/Makefile1
-rw-r--r--drivers/watchdog/pretimeout_panic.c47
-rw-r--r--drivers/watchdog/watchdog_pretimeout.c6
-rw-r--r--drivers/watchdog/watchdog_pretimeout.h2
5 files changed, 66 insertions, 4 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 4aeb8f95beb4..cbd33321c0f8 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1856,6 +1856,14 @@ config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP
governor is selected by a user, write a short message to
the kernel log buffer and don't do any system changes.
+config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC
+ bool "panic"
+ select WATCHDOG_PRETIMEOUT_GOV_PANIC
+ help
+ Use panic watchdog pretimeout governor by default, if
+ a watchdog pretimeout event happens, consider that
+ a watchdog feeder is dead and reboot is unavoidable.
+
endchoice
config WATCHDOG_PRETIMEOUT_GOV_NOOP
@@ -1864,6 +1872,12 @@ config WATCHDOG_PRETIMEOUT_GOV_NOOP
Noop watchdog pretimeout governor, only an informational
message is added to kernel log buffer.
+config WATCHDOG_PRETIMEOUT_GOV_PANIC
+ tristate "Panic watchdog pretimeout governor"
+ help
+ Panic watchdog pretimeout governor, on watchdog pretimeout
+ event put the kernel into panic.
+
endif # WATCHDOG_PRETIMEOUT_GOV
endif # WATCHDOG
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 0502a21db1db..1a34c6a96988 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
# 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_panic.c b/drivers/watchdog/pretimeout_panic.c
new file mode 100644
index 000000000000..0c197a1c97f4
--- /dev/null
+++ b/drivers/watchdog/pretimeout_panic.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2015-2016 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/kernel.h>
+#include <linux/module.h>
+#include <linux/watchdog.h>
+
+#include "watchdog_pretimeout.h"
+
+/**
+ * pretimeout_panic - Panic on watchdog pretimeout event
+ * @wdd - watchdog_device
+ *
+ * Panic, watchdog has not been fed till pretimeout event.
+ */
+static void pretimeout_panic(struct watchdog_device *wdd)
+{
+ panic("watchdog pretimeout event\n");
+}
+
+static struct watchdog_governor watchdog_gov_panic = {
+ .name = "panic",
+ .pretimeout = pretimeout_panic,
+};
+
+static int __init watchdog_gov_panic_register(void)
+{
+ return watchdog_register_governor(&watchdog_gov_panic);
+}
+
+static void __exit watchdog_gov_panic_unregister(void)
+{
+ watchdog_unregister_governor(&watchdog_gov_panic);
+}
+module_init(watchdog_gov_panic_register);
+module_exit(watchdog_gov_panic_unregister);
+
+MODULE_AUTHOR("Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>");
+MODULE_DESCRIPTION("Panic watchdog pretimeout governor");
+MODULE_LICENSE("GPL");
diff --git a/drivers/watchdog/watchdog_pretimeout.c b/drivers/watchdog/watchdog_pretimeout.c
index 72612255fb55..098c965f6c78 100644
--- a/drivers/watchdog/watchdog_pretimeout.c
+++ b/drivers/watchdog/watchdog_pretimeout.c
@@ -60,7 +60,8 @@ int watchdog_register_governor(struct watchdog_governor *gov)
{
struct watchdog_pretimeout *p;
- if (!default_gov) {
+ if (!strncmp(gov->name, WATCHDOG_PRETIMEOUT_DEFAULT_GOV,
+ WATCHDOG_GOV_NAME_MAXLEN)) {
spin_lock_irq(&pretimeout_lock);
default_gov = gov;
@@ -79,9 +80,6 @@ void watchdog_unregister_governor(struct watchdog_governor *gov)
struct watchdog_pretimeout *p;
spin_lock_irq(&pretimeout_lock);
- if (gov == default_gov)
- default_gov = NULL;
-
list_for_each_entry(p, &pretimeout_list, entry)
if (p->wdd->gov == gov)
p->wdd->gov = default_gov;
diff --git a/drivers/watchdog/watchdog_pretimeout.h b/drivers/watchdog/watchdog_pretimeout.h
index c4b6f88dc9c9..867492aa7ea6 100644
--- a/drivers/watchdog/watchdog_pretimeout.h
+++ b/drivers/watchdog/watchdog_pretimeout.h
@@ -22,6 +22,8 @@ int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf);
#if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP)
#define WATCHDOG_PRETIMEOUT_DEFAULT_GOV "noop"
+#elif IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC)
+#define WATCHDOG_PRETIMEOUT_DEFAULT_GOV "panic"
#endif
#else