Add subsystem crash reason record and notify it by uevent (997e6185) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/soc/qcom/subsys-pil-tz.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -821,6 +821,7 @@ static void log_failure_reason(const struct pil_tz_data *d)
		__builtin_return_address(0));
		save_dump_reason_to_smem(reason, function_name);
		pr_err("%s subsystem failure reason: %s.\n", name, reason);
		subsys_store_crash_reason(d->subsys, reason);
		}

		static int subsys_shutdown(const struct subsys_desc *subsys, bool force_stop)

drivers/soc/qcom/subsystem_restart.c

+43 −0

Original line number	Diff line number	Diff line
		@@ -195,6 +195,7 @@ struct subsys_device {
		int id;
		int restart_level;
		int crash_count;
		char crash_reason[256];
		struct subsys_soc_restart_order *restart_order;
		bool do_ramdump_on_put;
		struct cdev char_dev;
		@@ -254,6 +255,13 @@ static ssize_t crash_count_show(struct device *dev,
		}
		static DEVICE_ATTR_RO(crash_count);

		static ssize_t crash_reason_show(struct device *dev,
		struct device_attribute attr, char buf)
		{
		return snprintf(buf, PAGE_SIZE, "%s\n", to_subsys(dev)->crash_reason);
		}
		static DEVICE_ATTR_RO(crash_reason);

		static ssize_t
		restart_level_show(struct device dev, struct device_attribute attr, char *buf)
		{
		@@ -380,10 +388,44 @@ void subsys_default_online(struct subsys_device *dev)
		}
		EXPORT_SYMBOL(subsys_default_online);

		static void subsys_send_uevent_notify(struct subsys_desc *desc, int crash_count)
		{
		char *envp[4];
		struct subsys_device *dev;

		if (!desc)
		return;

		dev = find_subsys_device(desc->name);
		if (!dev)
		return;

		envp[0] = kasprintf(GFP_KERNEL, "SUBSYSTEM=%s", desc->name);
		envp[1] = kasprintf(GFP_KERNEL, "CRASHCOUNT=%d", crash_count);
		envp[2] = kasprintf(GFP_KERNEL, "CRASHREASON=%s", dev->crash_reason);
		envp[3] = NULL;
		kobject_uevent_env(&desc->dev->kobj, KOBJ_CHANGE, envp);
		pr_err("%s %s %s\n", envp[0], envp[1], envp[2]);
		kfree(envp[2]);
		kfree(envp[1]);
		kfree(envp[0]);
		}

		void subsys_store_crash_reason(struct subsys_device dev, char reason)
		{
		if (dev == NULL)
		return;

		if (reason != NULL)
		strlcpy(dev->crash_reason, reason, sizeof(dev->crash_reason));
		}
		EXPORT_SYMBOL(subsys_store_crash_reason);

		static struct attribute *subsys_attrs[] = {
		&dev_attr_name.attr,
		&dev_attr_state.attr,
		&dev_attr_crash_count.attr,
		&dev_attr_crash_reason.attr,
		&dev_attr_restart_level.attr,
		&dev_attr_firmware_name.attr,
		&dev_attr_system_debug.attr,
		@@ -749,6 +791,7 @@ static int subsystem_shutdown(struct subsys_device dev, void data)
		subsys_set_state(dev, SUBSYS_OFFLINE);
		disable_all_irqs(dev);

		subsys_send_uevent_notify(dev->desc, dev->crash_count);
		return 0;
		}

include/soc/qcom/subsystem_restart.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -146,6 +146,7 @@ struct notif_data {

		extern int subsys_get_restart_level(struct subsys_device *dev);
		extern int subsystem_restart_dev(struct subsys_device *dev);
		extern void subsys_store_crash_reason(struct subsys_device dev, char reason);
		extern int subsystem_restart(const char *name);
		extern int subsystem_crashed(const char *name);

		@@ -180,6 +181,9 @@ static inline int subsystem_restart_dev(struct subsys_device *dev)
		return 0;
		}

		static inline void subsys_store_crash_reason(struct subsys_device *dev,
		char *reason) { }

		static inline int subsystem_restart(const char *name)
		{
		return 0;