Merge git://www.linux-watchdog.org/linux-watchdog

[cascardo/linux.git] / include / linux / watchdog.h

diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index 7047bc7..35a4d81 100644 (file)
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -19,6 +19,7 @@
 struct watchdog_ops;
 struct watchdog_device;
 struct watchdog_core_data;
+struct watchdog_governor;
 
 /** struct watchdog_ops - The watchdog-devices operations
  *
@@ -28,6 +29,7 @@ struct watchdog_core_data;
  * @ping:      The routine that sends a keepalive ping to the 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).
+ * @set_pretimeout:The routine for setting the watchdog devices pretimeout.
  * @get_timeleft:The routine that gets the time left before a reset (in seconds).
  * @restart:   The routine for restarting the machine.
  * @ioctl:     The routines that handles extra ioctl calls.
@@ -46,6 +48,7 @@ struct watchdog_ops {
        int (*ping)(struct watchdog_device *);
        unsigned int (*status)(struct watchdog_device *);
        int (*set_timeout)(struct watchdog_device *, unsigned int);
+       int (*set_pretimeout)(struct watchdog_device *, unsigned int);
        unsigned int (*get_timeleft)(struct watchdog_device *);
        int (*restart)(struct watchdog_device *, unsigned long, void *);
        long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
@@ -59,8 +62,10 @@ struct watchdog_ops {
  *             watchdog device.
  * @info:      Pointer to a watchdog_info structure.
  * @ops:       Pointer to the list of watchdog operations.
+ * @gov:       Pointer to watchdog pretimeout governor.
  * @bootstatus:        Status of the watchdog device at boot.
  * @timeout:   The watchdog devices timeout value (in seconds).
+ * @pretimeout: The watchdog devices pre_timeout value.
  * @min_timeout:The watchdog devices minimum timeout value (in seconds).
  * @max_timeout:The watchdog devices maximum timeout value (in seconds)
  *             as configurable from user space. Only relevant if
@@ -94,8 +99,10 @@ struct watchdog_device {
        const struct attribute_group **groups;
        const struct watchdog_info *info;
        const struct watchdog_ops *ops;
+       const struct watchdog_governor *gov;
        unsigned int bootstatus;
        unsigned int timeout;
+       unsigned int pretimeout;
        unsigned int min_timeout;
        unsigned int max_timeout;
        unsigned int min_hw_heartbeat_ms;
@@ -163,6 +170,13 @@ static inline bool watchdog_timeout_invalid(struct watchdog_device *wdd, unsigne
                 t > wdd->max_timeout);
 }
 
+/* Use the following function to check if a pretimeout value is invalid */
+static inline bool watchdog_pretimeout_invalid(struct watchdog_device *wdd,
+                                              unsigned int t)
+{
+       return t && wdd->timeout && t >= wdd->timeout;
+}
+
 /* Use the following functions to manipulate watchdog driver specific data */
 static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data)
 {
@@ -174,6 +188,16 @@ static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
        return wdd->driver_data;
 }
 
+/* Use the following functions to report watchdog pretimeout event */
+#if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV)
+void watchdog_notify_pretimeout(struct watchdog_device *wdd);
+#else
+static inline void watchdog_notify_pretimeout(struct watchdog_device *wdd)
+{
+       pr_alert("watchdog%d: pretimeout event\n", wdd->id);
+}
+#endif
+
 /* 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,