diff options
Diffstat (limited to 'include/linux/watchdog.h')
| -rw-r--r-- | include/linux/watchdog.h | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h index 0b565f2ad242..8e82daecb7d3 100644 --- a/include/linux/watchdog.h +++ b/include/linux/watchdog.h @@ -10,8 +10,9 @@ #include <linux/bitops.h> -#include <linux/device.h> #include <linux/cdev.h> +#include <linux/device.h> +#include <linux/kernel.h> #include <linux/notifier.h> #include <uapi/linux/watchdog.h> @@ -61,14 +62,19 @@ struct watchdog_ops { * @bootstatus: Status of the watchdog device at boot. * @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). + * @max_timeout:The watchdog devices maximum timeout value (in seconds) + * as configurable from user space. Only relevant if + * max_hw_heartbeat_ms is not provided. + * @max_hw_heartbeat_ms: + * Hardware limit for maximum timeout, in milli-seconds. + * Replaces max_timeout if specified. * @reboot_nb: The notifier block to stop watchdog on reboot. * @restart_nb: The notifier block to register a restart function. * @driver_data:Pointer to the drivers private data. * @wd_data: Pointer to watchdog core internal data. * @status: Field that contains the devices internal status bits. - * @deferred: entry in wtd_deferred_reg_list which is used to - * register early initialized watchdogs. + * @deferred: Entry in wtd_deferred_reg_list which is used to + * register early initialized watchdogs. * * The watchdog_device structure contains all information about a * watchdog timer device. @@ -89,6 +95,7 @@ struct watchdog_device { unsigned int timeout; unsigned int min_timeout; unsigned int max_timeout; + unsigned int max_hw_heartbeat_ms; struct notifier_block reboot_nb; struct notifier_block restart_nb; void *driver_data; @@ -128,13 +135,18 @@ static inline bool watchdog_timeout_invalid(struct watchdog_device *wdd, unsigne { /* * The timeout is invalid if + * - the requested value is larger than UINT_MAX / 1000 + * (since internal calculations are done in milli-seconds), + * or * - the requested value is smaller than the configured minimum timeout, * or - * - a maximum timeout is configured, and the requested value is larger - * than the maximum timeout. + * - a maximum hardware timeout is not configured, a maximum timeout + * is configured, and the requested value is larger than the + * configured maximum timeout. */ - return t < wdd->min_timeout || - (wdd->max_timeout && t > wdd->max_timeout); + return t > UINT_MAX / 1000 || t < wdd->min_timeout || + (!wdd->max_hw_heartbeat_ms && wdd->max_timeout && + t > wdd->max_timeout); } /* Use the following functions to manipulate watchdog driver specific data */ |