Merge "soc: qcom: ssr: Add keep alive mechanism for subsystems" (f1577fb7) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/soc/qcom/subsystem_restart.c

+34 −0

Original line number	Diff line number	Diff line
		@@ -148,6 +148,7 @@ struct restart_log {
		* @count: reference count of subsystem_get()/subsystem_put()
		* @id: ida
		* @restart_level: restart level (0 - panic, 1 - related, 2 - independent, etc.)
		* @keep_alive: whether keep alive during AP's panic
		* @restart_order: order of other devices this devices restarts with
		* @crash_count: number of times the device has crashed
		* @dentry: debugfs directory for this device
		@@ -170,6 +171,7 @@ struct subsys_device {
		int count;
		int id;
		int restart_level;
		bool keep_alive;
		int crash_count;
		struct subsys_soc_restart_order *restart_order;
		#ifdef CONFIG_DEBUG_FS
		@@ -308,6 +310,31 @@ static ssize_t system_debug_store(struct device *dev,
		return orig_count;
		}

		static ssize_t keep_alive_show(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct subsys_device *subsys = to_subsys(dev);

		return snprintf(buf, PAGE_SIZE, "%d\n", subsys->keep_alive);
		}

		static ssize_t keep_alive_store(struct device *dev,
		struct device_attribute attr, const char buf,
		size_t count)
		{
		struct subsys_device *subsys = to_subsys(dev);
		unsigned long value;

		if (kstrtoul(buf, 0, &value) != 0)
		return -EINVAL;
		if (value > 1)
		return -EINVAL;

		subsys->keep_alive = (bool)value;

		return count;
		}

		int subsys_get_restart_level(struct subsys_device *dev)
		{
		return dev->restart_level;
		@@ -350,6 +377,7 @@ static struct device_attribute subsys_attrs[] = {
		__ATTR(restart_level, 0644, restart_level_show, restart_level_store),
		__ATTR(firmware_name, 0644, firmware_name_show, firmware_name_store),
		__ATTR(system_debug, 0644, system_debug_show, system_debug_store),
		__ATTR(keep_alive, 0644, keep_alive_show, keep_alive_store),
		__ATTR_NULL,
		};

		@@ -1779,6 +1807,12 @@ static int subsys_panic(struct device dev, void data)
		{
		struct subsys_device *subsys = to_subsys(dev);

		/* Keeping the subsys alive during panic */
		if (!panic_timeout && subsys->keep_alive) {
		dev_warn(dev, "keeping %s alive\n", subsys->desc->name);
		return 0;
		}

		if (subsys->desc->crash_shutdown)
		subsys->desc->crash_shutdown(subsys->desc);
		return 0;