watchdog: pretimeout: add pretimeout_available_governors attribute
The change adds an option to a user with CONFIG_WATCHDOG_SYSFS and CONFIG_WATCHDOG_PRETIMEOUT_GOV enabled to get information about all registered watchdog pretimeout governors by reading watchdog device attribute named "pretimeout_available_governors". 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>
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@ -489,6 +489,13 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr,
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}
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}
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static DEVICE_ATTR_RO(state);
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static DEVICE_ATTR_RO(state);
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static ssize_t pretimeout_available_governors_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return watchdog_pretimeout_available_governors_get(buf);
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}
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static DEVICE_ATTR_RO(pretimeout_available_governors);
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static ssize_t pretimeout_governor_show(struct device *dev,
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static ssize_t pretimeout_governor_show(struct device *dev,
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struct device_attribute *attr,
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struct device_attribute *attr,
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char *buf)
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char *buf)
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@ -524,7 +531,8 @@ static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr,
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else if (attr == &dev_attr_pretimeout.attr &&
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else if (attr == &dev_attr_pretimeout.attr &&
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!(wdd->info->options & WDIOF_PRETIMEOUT))
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!(wdd->info->options & WDIOF_PRETIMEOUT))
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mode = 0;
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mode = 0;
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else if (attr == &dev_attr_pretimeout_governor.attr &&
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else if ((attr == &dev_attr_pretimeout_governor.attr ||
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attr == &dev_attr_pretimeout_available_governors.attr) &&
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(!(wdd->info->options & WDIOF_PRETIMEOUT) ||
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(!(wdd->info->options & WDIOF_PRETIMEOUT) ||
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!IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV)))
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!IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV)))
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mode = 0;
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mode = 0;
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@ -541,6 +549,7 @@ static struct attribute *wdt_attrs[] = {
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&dev_attr_status.attr,
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&dev_attr_status.attr,
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&dev_attr_nowayout.attr,
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&dev_attr_nowayout.attr,
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&dev_attr_pretimeout_governor.attr,
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&dev_attr_pretimeout_governor.attr,
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&dev_attr_pretimeout_available_governors.attr,
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NULL,
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NULL,
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};
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};
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@ -52,6 +52,21 @@ static struct governor_priv *find_governor_by_name(const char *gov_name)
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return NULL;
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return NULL;
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}
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}
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int watchdog_pretimeout_available_governors_get(char *buf)
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{
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struct governor_priv *priv;
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int count = 0;
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mutex_lock(&governor_lock);
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list_for_each_entry(priv, &governor_list, entry)
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count += sprintf(buf + count, "%s\n", priv->gov->name);
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mutex_unlock(&governor_lock);
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return count;
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}
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int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf)
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int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf)
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{
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{
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int count = 0;
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int count = 0;
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@ -18,6 +18,7 @@ void watchdog_unregister_governor(struct watchdog_governor *gov);
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/* Interfaces to watchdog_dev.c */
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/* Interfaces to watchdog_dev.c */
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int watchdog_register_pretimeout(struct watchdog_device *wdd);
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int watchdog_register_pretimeout(struct watchdog_device *wdd);
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void watchdog_unregister_pretimeout(struct watchdog_device *wdd);
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void watchdog_unregister_pretimeout(struct watchdog_device *wdd);
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int watchdog_pretimeout_available_governors_get(char *buf);
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int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf);
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int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf);
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int watchdog_pretimeout_governor_set(struct watchdog_device *wdd,
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int watchdog_pretimeout_governor_set(struct watchdog_device *wdd,
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const char *buf);
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const char *buf);
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@ -38,6 +39,11 @@ static inline void watchdog_unregister_pretimeout(struct watchdog_device *wdd)
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{
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{
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}
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}
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static inline int watchdog_pretimeout_available_governors_get(char *buf)
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{
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return -EINVAL;
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}
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static inline int watchdog_pretimeout_governor_get(struct watchdog_device *wdd,
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static inline int watchdog_pretimeout_governor_get(struct watchdog_device *wdd,
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char *buf)
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char *buf)
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{
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{
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