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watchdog: Implement status function in watchdog core 

Up to now, the watchdog status function called a driver function,
which was supposed to return the watchdog status. All but one
driver using the watchdog core did not implement this function,
and the driver implementing it did not implement it correctly
(the function is supposed to return WDIOF_ flags). At the same time,
at least some of the status information can be provided by the watchdog
core.

Provide the available status bits directly from the watchdog driver core.
Call the driver status function if it exists to get the boot status, but
always provide WDIOF_MAGICCLOSE and WDIOF_KEEPALIVEPING internally.
This patch makes the 'status' sysfs attribute always available.
This attribute is now displayed as hex number with 0x prepended to be
easier to decode.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Guenter Roeck 2016-07-17 15:04:11 -07:00 committed by Wim Van Sebroeck
parent c7ef68c322
commit 90b826f17a
2 changed files with 31 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/watchdog/watchdog-kernel-api.txt
View File

@ -167,6 +167,10 @@ they are supported. These optional routines/operations are:
info structure).
* status: this routine checks the status of the watchdog timer device. The
status of the device is reported with watchdog WDIOF_* status flags/bits.
WDIOF_MAGICCLOSE and WDIOF_KEEPALIVEPING are reported by the watchdog core;
it is not necessary to report those bits from the driver. Also, if no status
function is provided by the driver, the watchdog core reports the status bits
provided in the bootstatus variable of struct watchdog_device.
* set_timeout: this routine checks and changes the timeout of the watchdog
timer device. It returns 0 on success, -EINVAL for "parameter out of range"
and -EIO for "could not write value to the watchdog". On success this

34
drivers/watchdog/watchdog_dev.c
View File

@ -69,6 +69,7 @@ struct watchdog_core_data {
unsigned long status; /* Internal status bits */
#define _WDOG_DEV_OPEN 0 /* Opened ? */
#define _WDOG_ALLOW_RELEASE 1 /* Did we receive the magic char ? */
#define _WDOG_KEEPALIVE 2 /* Did we receive a keepalive ? */
};
/* the dev_t structure to store the dynamically allocated watchdog devices */
@ -184,6 +185,8 @@ static int watchdog_ping(struct watchdog_device *wdd)
if (!watchdog_active(wdd) && !watchdog_hw_running(wdd))
return 0;
set_bit(_WDOG_KEEPALIVE, &wd_data->status);
wd_data->last_keepalive = jiffies;
return __watchdog_ping(wdd);
}
@ -223,6 +226,8 @@ static int watchdog_start(struct watchdog_device *wdd)
if (watchdog_active(wdd))
return 0;
set_bit(_WDOG_KEEPALIVE, &wd_data->status);
started_at = jiffies;
if (watchdog_hw_running(wdd) && wdd->ops->ping)
err = wdd->ops->ping(wdd);
@ -286,10 +291,27 @@ static int watchdog_stop(struct watchdog_device *wdd)
static unsigned int watchdog_get_status(struct watchdog_device *wdd)
{
if (!wdd->ops->status)
return 0;
struct watchdog_core_data *wd_data = wdd->wd_data;
unsigned int status;
return wdd->ops->status(wdd);
if (wdd->ops->status)
status = wdd->ops->status(wdd);
else
status = wdd->bootstatus & (WDIOF_CARDRESET |
WDIOF_OVERHEAT |
WDIOF_FANFAULT |
WDIOF_EXTERN1 |
WDIOF_EXTERN2 |
WDIOF_POWERUNDER |
WDIOF_POWEROVER);
if (test_bit(_WDOG_ALLOW_RELEASE, &wd_data->status))
status |= WDIOF_MAGICCLOSE;
if (test_and_clear_bit(_WDOG_KEEPALIVE, &wd_data->status))
status |= WDIOF_KEEPALIVEPING;
return status;
}
/*
@ -365,7 +387,7 @@ static ssize_t status_show(struct device *dev, struct device_attribute *attr,
status = watchdog_get_status(wdd);
mutex_unlock(&wd_data->lock);
return sprintf(buf, "%u\n", status);
return sprintf(buf, "0x%x\n", status);
}
static DEVICE_ATTR_RO(status);
@ -433,9 +455,7 @@ static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr,
struct watchdog_device *wdd = dev_get_drvdata(dev);
umode_t mode = attr->mode;
if (attr == &dev_attr_status.attr && !wdd->ops->status)
mode = 0;
else if (attr == &dev_attr_timeleft.attr && !wdd->ops->get_timeleft)
if (attr == &dev_attr_timeleft.attr && !wdd->ops->get_timeleft)
mode = 0;
return mode;