53f96cee1a
The change converts watchdog device attribute "pretimeout_governor" from read-only to read-write type to allow users to select a desirable watchdog pretimeout governor in runtime, e.g. % echo -n panic > /sys/..../watchdog/watchdog0/pretimeout To get this working a list of registered pretimeout governors is created and a new helper function watchdog_pretimeout_governor_set() is exported to watchdog_dev.c. If a selected governor is gone, a watchdog device pretimeout notification is delegated to a default built-in pretimeout governor. 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>
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
#ifndef __WATCHDOG_PRETIMEOUT_H
|
|
#define __WATCHDOG_PRETIMEOUT_H
|
|
|
|
#define WATCHDOG_GOV_NAME_MAXLEN 20
|
|
|
|
struct watchdog_device;
|
|
|
|
struct watchdog_governor {
|
|
const char name[WATCHDOG_GOV_NAME_MAXLEN];
|
|
void (*pretimeout)(struct watchdog_device *wdd);
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV)
|
|
/* Interfaces to watchdog pretimeout governors */
|
|
int watchdog_register_governor(struct watchdog_governor *gov);
|
|
void watchdog_unregister_governor(struct watchdog_governor *gov);
|
|
|
|
/* Interfaces to watchdog_dev.c */
|
|
int watchdog_register_pretimeout(struct watchdog_device *wdd);
|
|
void watchdog_unregister_pretimeout(struct watchdog_device *wdd);
|
|
int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf);
|
|
int watchdog_pretimeout_governor_set(struct watchdog_device *wdd,
|
|
const 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
|
|
static inline int watchdog_register_pretimeout(struct watchdog_device *wdd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void watchdog_unregister_pretimeout(struct watchdog_device *wdd)
|
|
{
|
|
}
|
|
|
|
static inline int watchdog_pretimeout_governor_get(struct watchdog_device *wdd,
|
|
char *buf)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline int watchdog_pretimeout_governor_set(struct watchdog_device *wdd,
|
|
const char *buf)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
#endif
|