diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.4/009-1-watchdog-core-add-restart-handler-support.patch')
-rw-r--r-- | target/linux/ipq806x/patches-4.4/009-1-watchdog-core-add-restart-handler-support.patch | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/target/linux/ipq806x/patches-4.4/009-1-watchdog-core-add-restart-handler-support.patch b/target/linux/ipq806x/patches-4.4/009-1-watchdog-core-add-restart-handler-support.patch deleted file mode 100644 index 0534e78a27..0000000000 --- a/target/linux/ipq806x/patches-4.4/009-1-watchdog-core-add-restart-handler-support.patch +++ /dev/null @@ -1,205 +0,0 @@ -From 2165bf524da5f5e496d1cdb8c5afae1345ecce1e Mon Sep 17 00:00:00 2001 -From: Damien Riegel <damien.riegel@savoirfairelinux.com> -Date: Mon, 16 Nov 2015 12:27:59 -0500 -Subject: watchdog: core: add restart handler support - -Many watchdog drivers implement the same code to register a restart -handler. This patch provides a generic way to set such a function. - -The patch adds a new restart watchdog operation. If a restart priority -greater than 0 is needed, the driver can call -watchdog_set_restart_priority to set it. - -Suggested-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> -Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com> -Reviewed-by: Guenter Roeck <linux@roeck-us.net> -Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> -Signed-off-by: Guenter Roeck <linux@roeck-us.net> -Signed-off-by: Wim Van Sebroeck <wim@iguana.be> ---- - Documentation/watchdog/watchdog-kernel-api.txt | 19 ++++++++++ - drivers/watchdog/watchdog_core.c | 48 ++++++++++++++++++++++++++ - include/linux/watchdog.h | 6 ++++ - 3 files changed, 73 insertions(+) - ---- a/Documentation/watchdog/watchdog-kernel-api.txt -+++ b/Documentation/watchdog/watchdog-kernel-api.txt -@@ -53,6 +53,7 @@ struct watchdog_device { - unsigned int timeout; - unsigned int min_timeout; - unsigned int max_timeout; -+ struct notifier_block restart_nb; - void *driver_data; - struct mutex lock; - unsigned long status; -@@ -75,6 +76,10 @@ It contains following fields: - * timeout: the watchdog timer's timeout value (in seconds). - * min_timeout: the watchdog timer's minimum timeout value (in seconds). - * max_timeout: the watchdog timer's maximum timeout value (in seconds). -+* restart_nb: notifier block that is registered for machine restart, for -+ internal use only. If a watchdog is capable of restarting the machine, it -+ should define ops->restart. Priority can be changed through -+ watchdog_set_restart_priority. - * bootstatus: status of the device after booting (reported with watchdog - WDIOF_* status bits). - * driver_data: a pointer to the drivers private data of a watchdog device. -@@ -100,6 +105,7 @@ struct watchdog_ops { - unsigned int (*status)(struct watchdog_device *); - int (*set_timeout)(struct watchdog_device *, unsigned int); - unsigned int (*get_timeleft)(struct watchdog_device *); -+ int (*restart)(struct watchdog_device *); - void (*ref)(struct watchdog_device *); - void (*unref)(struct watchdog_device *); - long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long); -@@ -164,6 +170,8 @@ they are supported. These optional routi - (Note: the WDIOF_SETTIMEOUT needs to be set in the options field of the - watchdog's info structure). - * get_timeleft: this routines returns the time that's left before a reset. -+* restart: this routine restarts the machine. It returns 0 on success or a -+ negative errno code for failure. - * ref: the operation that calls kref_get on the kref of a dynamically - allocated watchdog_device struct. - * unref: the operation that calls kref_put on the kref of a dynamically -@@ -231,3 +239,14 @@ the device tree (if the module timeout p - to set the default timeout value as timeout value in the watchdog_device and - then use this function to set the user "preferred" timeout value. - This routine returns zero on success and a negative errno code for failure. -+ -+To change the priority of the restart handler the following helper should be -+used: -+ -+void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority); -+ -+User should follow the following guidelines for setting the priority: -+* 0: should be called in last resort, has limited restart capabilities -+* 128: default restart handler, use if no other handler is expected to be -+ available, and/or if restart is sufficient to restart the entire system -+* 255: highest priority, will preempt all other restart handlers ---- a/drivers/watchdog/watchdog_core.c -+++ b/drivers/watchdog/watchdog_core.c -@@ -32,6 +32,7 @@ - #include <linux/types.h> /* For standard types */ - #include <linux/errno.h> /* For the -ENODEV/... values */ - #include <linux/kernel.h> /* For printk/panic/... */ -+#include <linux/reboot.h> /* For restart handler */ - #include <linux/watchdog.h> /* For watchdog specific items */ - #include <linux/init.h> /* For __init/__exit/... */ - #include <linux/idr.h> /* For ida_* macros */ -@@ -137,6 +138,41 @@ int watchdog_init_timeout(struct watchdo - } - EXPORT_SYMBOL_GPL(watchdog_init_timeout); - -+static int watchdog_restart_notifier(struct notifier_block *nb, -+ unsigned long action, void *data) -+{ -+ struct watchdog_device *wdd = container_of(nb, struct watchdog_device, -+ restart_nb); -+ -+ int ret; -+ -+ ret = wdd->ops->restart(wdd); -+ if (ret) -+ return NOTIFY_BAD; -+ -+ return NOTIFY_DONE; -+} -+ -+/** -+ * watchdog_set_restart_priority - Change priority of restart handler -+ * @wdd: watchdog device -+ * @priority: priority of the restart handler, should follow these guidelines: -+ * 0: use watchdog's restart function as last resort, has limited restart -+ * capabilies -+ * 128: default restart handler, use if no other handler is expected to be -+ * available and/or if restart is sufficient to restart the entire system -+ * 255: preempt all other handlers -+ * -+ * If a wdd->ops->restart function is provided when watchdog_register_device is -+ * called, it will be registered as a restart handler with the priority given -+ * here. -+ */ -+void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority) -+{ -+ wdd->restart_nb.priority = priority; -+} -+EXPORT_SYMBOL_GPL(watchdog_set_restart_priority); -+ - static int __watchdog_register_device(struct watchdog_device *wdd) - { - int ret, id = -1, devno; -@@ -202,6 +238,15 @@ static int __watchdog_register_device(st - return ret; - } - -+ if (wdd->ops->restart) { -+ wdd->restart_nb.notifier_call = watchdog_restart_notifier; -+ -+ ret = register_restart_handler(&wdd->restart_nb); -+ if (ret) -+ dev_warn(wdd->dev, "Cannot register restart handler (%d)\n", -+ ret); -+ } -+ - return 0; - } - -@@ -238,6 +283,9 @@ static void __watchdog_unregister_device - if (wdd == NULL) - return; - -+ if (wdd->ops->restart) -+ unregister_restart_handler(&wdd->restart_nb); -+ - devno = wdd->cdev.dev; - ret = watchdog_dev_unregister(wdd); - if (ret) ---- a/include/linux/watchdog.h -+++ b/include/linux/watchdog.h -@@ -12,6 +12,7 @@ - #include <linux/bitops.h> - #include <linux/device.h> - #include <linux/cdev.h> -+#include <linux/notifier.h> - #include <uapi/linux/watchdog.h> - - struct watchdog_ops; -@@ -26,6 +27,7 @@ struct watchdog_device; - * @status: The routine that shows the status of the watchdog device. - * @set_timeout:The routine for setting the watchdog devices timeout value (in seconds). - * @get_timeleft:The routine that gets the time left before a reset (in seconds). -+ * @restart: The routine for restarting the machine. - * @ref: The ref operation for dyn. allocated watchdog_device structs - * @unref: The unref operation for dyn. allocated watchdog_device structs - * @ioctl: The routines that handles extra ioctl calls. -@@ -45,6 +47,7 @@ struct watchdog_ops { - unsigned int (*status)(struct watchdog_device *); - int (*set_timeout)(struct watchdog_device *, unsigned int); - unsigned int (*get_timeleft)(struct watchdog_device *); -+ int (*restart)(struct watchdog_device *); - void (*ref)(struct watchdog_device *); - void (*unref)(struct watchdog_device *); - long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long); -@@ -62,6 +65,7 @@ struct watchdog_ops { - * @timeout: The watchdog devices timeout value (in seconds). - * @min_timeout:The watchdog devices minimum timeout value (in seconds). - * @max_timeout:The watchdog devices maximum timeout value (in seconds). -+ * @restart_nb: The notifier block to register a restart function. - * @driver-data:Pointer to the drivers private data. - * @lock: Lock for watchdog core internal use only. - * @status: Field that contains the devices internal status bits. -@@ -88,6 +92,7 @@ struct watchdog_device { - unsigned int timeout; - unsigned int min_timeout; - unsigned int max_timeout; -+ struct notifier_block restart_nb; - void *driver_data; - struct mutex lock; - unsigned long status; -@@ -142,6 +147,7 @@ static inline void *watchdog_get_drvdata - } - - /* drivers/watchdog/watchdog_core.c */ -+void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority); - extern int watchdog_init_timeout(struct watchdog_device *wdd, - unsigned int timeout_parm, struct device *dev); - extern int watchdog_register_device(struct watchdog_device *); |