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path: root/drivers/watchdog/watchdog_dev.c
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Diffstat (limited to 'drivers/watchdog/watchdog_dev.c')
-rw-r--r--drivers/watchdog/watchdog_dev.c101
1 files changed, 99 insertions, 2 deletions
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 040bf8382f46..32930a073a12 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -49,6 +49,7 @@
#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
#include "watchdog_core.h"
+#include "watchdog_pretimeout.h"
/*
* struct watchdog_core_data - watchdog core internal data
@@ -335,10 +336,14 @@ static int watchdog_set_timeout(struct watchdog_device *wdd,
if (watchdog_timeout_invalid(wdd, timeout))
return -EINVAL;
- if (wdd->ops->set_timeout)
+ if (wdd->ops->set_timeout) {
err = wdd->ops->set_timeout(wdd, timeout);
- else
+ } else {
wdd->timeout = timeout;
+ /* Disable pretimeout if it doesn't fit the new timeout */
+ if (wdd->pretimeout >= wdd->timeout)
+ wdd->pretimeout = 0;
+ }
watchdog_update_worker(wdd);
@@ -346,6 +351,31 @@ static int watchdog_set_timeout(struct watchdog_device *wdd,
}
/*
+ * watchdog_set_pretimeout: set the watchdog timer pretimeout
+ * @wdd: the watchdog device to set the timeout for
+ * @timeout: pretimeout to set in seconds
+ */
+
+static int watchdog_set_pretimeout(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ int err = 0;
+
+ if (!(wdd->info->options & WDIOF_PRETIMEOUT))
+ return -EOPNOTSUPP;
+
+ if (watchdog_pretimeout_invalid(wdd, timeout))
+ return -EINVAL;
+
+ if (wdd->ops->set_pretimeout)
+ err = wdd->ops->set_pretimeout(wdd, timeout);
+ else
+ wdd->pretimeout = timeout;
+
+ return err;
+}
+
+/*
* watchdog_get_timeleft: wrapper to get the time left before a reboot
* @wdd: the watchdog device to get the remaining time from
* @timeleft: the time that's left
@@ -429,6 +459,15 @@ static ssize_t timeout_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(timeout);
+static ssize_t pretimeout_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct watchdog_device *wdd = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", wdd->pretimeout);
+}
+static DEVICE_ATTR_RO(pretimeout);
+
static ssize_t identity_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -450,6 +489,36 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(state);
+static ssize_t pretimeout_available_governors_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return watchdog_pretimeout_available_governors_get(buf);
+}
+static DEVICE_ATTR_RO(pretimeout_available_governors);
+
+static ssize_t pretimeout_governor_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct watchdog_device *wdd = dev_get_drvdata(dev);
+
+ return watchdog_pretimeout_governor_get(wdd, buf);
+}
+
+static ssize_t pretimeout_governor_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct watchdog_device *wdd = dev_get_drvdata(dev);
+ int ret = watchdog_pretimeout_governor_set(wdd, buf);
+
+ if (!ret)
+ ret = count;
+
+ return ret;
+}
+static DEVICE_ATTR_RW(pretimeout_governor);
+
static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr,
int n)
{
@@ -459,6 +528,14 @@ static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr,
if (attr == &dev_attr_timeleft.attr && !wdd->ops->get_timeleft)
mode = 0;
+ else if (attr == &dev_attr_pretimeout.attr &&
+ !(wdd->info->options & WDIOF_PRETIMEOUT))
+ mode = 0;
+ else if ((attr == &dev_attr_pretimeout_governor.attr ||
+ attr == &dev_attr_pretimeout_available_governors.attr) &&
+ (!(wdd->info->options & WDIOF_PRETIMEOUT) ||
+ !IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV)))
+ mode = 0;
return mode;
}
@@ -466,10 +543,13 @@ static struct attribute *wdt_attrs[] = {
&dev_attr_state.attr,
&dev_attr_identity.attr,
&dev_attr_timeout.attr,
+ &dev_attr_pretimeout.attr,
&dev_attr_timeleft.attr,
&dev_attr_bootstatus.attr,
&dev_attr_status.attr,
&dev_attr_nowayout.attr,
+ &dev_attr_pretimeout_governor.attr,
+ &dev_attr_pretimeout_available_governors.attr,
NULL,
};
@@ -646,6 +726,16 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
break;
err = put_user(val, p);
break;
+ case WDIOC_SETPRETIMEOUT:
+ if (get_user(val, p)) {
+ err = -EFAULT;
+ break;
+ }
+ err = watchdog_set_pretimeout(wdd, val);
+ break;
+ case WDIOC_GETPRETIMEOUT:
+ err = put_user(wdd->pretimeout, p);
+ break;
default:
err = -ENOTTY;
break;
@@ -937,6 +1027,12 @@ int watchdog_dev_register(struct watchdog_device *wdd)
return PTR_ERR(dev);
}
+ ret = watchdog_register_pretimeout(wdd);
+ if (ret) {
+ device_destroy(&watchdog_class, devno);
+ watchdog_cdev_unregister(wdd);
+ }
+
return ret;
}
@@ -950,6 +1046,7 @@ int watchdog_dev_register(struct watchdog_device *wdd)
void watchdog_dev_unregister(struct watchdog_device *wdd)
{
+ watchdog_unregister_pretimeout(wdd);
device_destroy(&watchdog_class, wdd->wd_data->cdev.dev);
watchdog_cdev_unregister(wdd);
}