enum sys_off_mode mode;
bool blocking;
void *list;
+ struct device *dev;
};
+/*
+ * This variable is used to indicate if a halt was initiated instead of a
+ * reboot when the reboot call was invoked with LINUX_REBOOT_CMD_POWER_OFF, but
+ * the system cannot be powered off. This allowes kernel_halt() to notify users
+ * of that.
+ */
+static bool poweroff_fallback_to_halt;
+
/*
* Temporary stub that prevents linkage failure while we're in process
* of removing all uses of legacy pm_power_off() around the kernel.
void emergency_restart(void)
{
kmsg_dump(KMSG_DUMP_EMERG);
+ system_state = SYSTEM_RESTART;
machine_emergency_restart();
}
EXPORT_SYMBOL_GPL(emergency_restart);
set_cpus_allowed_ptr(current, cpumask_of(cpu));
}
+/*
+ * Notifier list for kernel code which wants to be called
+ * to prepare system for restart.
+ */
+static BLOCKING_NOTIFIER_HEAD(restart_prep_handler_list);
+
+static void do_kernel_restart_prepare(void)
+{
+ blocking_notifier_call_chain(&restart_prep_handler_list, 0, NULL);
+}
+
/**
* kernel_restart - reboot the system
* @cmd: pointer to buffer containing command to execute for restart
void kernel_restart(char *cmd)
{
kernel_restart_prepare(cmd);
+ do_kernel_restart_prepare();
migrate_to_reboot_cpu();
syscore_shutdown();
if (!cmd)
kernel_shutdown_prepare(SYSTEM_HALT);
migrate_to_reboot_cpu();
syscore_shutdown();
- pr_emerg("System halted\n");
+ if (poweroff_fallback_to_halt)
+ pr_emerg("Power off not available: System halted instead\n");
+ else
+ pr_emerg("System halted\n");
kmsg_dump(KMSG_DUMP_SHUTDOWN);
machine_halt();
}
data.cb_data = handler->cb_data;
data.mode = mode;
data.cmd = cmd;
+ data.dev = handler->dev;
return handler->sys_off_cb(&data);
}
handler->list = &power_off_handler_list;
break;
+ case SYS_OFF_MODE_RESTART_PREPARE:
+ handler->list = &restart_prep_handler_list;
+ handler->blocking = true;
+ break;
+
case SYS_OFF_MODE_RESTART:
handler->list = &restart_handler_list;
break;
handler = register_sys_off_handler(mode, priority, callback, cb_data);
if (IS_ERR(handler))
return PTR_ERR(handler);
+ handler->dev = dev;
return devm_add_action_or_reset(dev, devm_unregister_sys_off_handler,
handler);
/* Instead of trying to make the power_off code look like
* halt when pm_power_off is not set do it the easy way.
*/
- if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !kernel_can_power_off())
+ if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !kernel_can_power_off()) {
+ poweroff_fallback_to_halt = true;
cmd = LINUX_REBOOT_CMD_HALT;
+ }
mutex_lock(&system_transition_mutex);
switch (cmd) {
}
/**
- * hw_protection_shutdown - Trigger an emergency system poweroff
+ * __hw_protection_shutdown - Trigger an emergency system shutdown or reboot
*
- * @reason: Reason of emergency shutdown to be printed.
- * @ms_until_forced: Time to wait for orderly shutdown before tiggering a
- * forced shudown. Negative value disables the forced
- * shutdown.
+ * @reason: Reason of emergency shutdown or reboot to be printed.
+ * @ms_until_forced: Time to wait for orderly shutdown or reboot before
+ * triggering it. Negative value disables the forced
+ * shutdown or reboot.
+ * @shutdown: If true, indicates that a shutdown will happen
+ * after the critical tempeature is reached.
+ * If false, indicates that a reboot will happen
+ * after the critical tempeature is reached.
*
- * Initiate an emergency system shutdown in order to protect hardware from
- * further damage. Usage examples include a thermal protection or a voltage or
- * current regulator failures.
- * NOTE: The request is ignored if protection shutdown is already pending even
- * if the previous request has given a large timeout for forced shutdown.
- * Can be called from any context.
+ * Initiate an emergency system shutdown or reboot in order to protect
+ * hardware from further damage. Usage examples include a thermal protection.
+ * NOTE: The request is ignored if protection shutdown or reboot is already
+ * pending even if the previous request has given a large timeout for forced
+ * shutdown/reboot.
*/
-void hw_protection_shutdown(const char *reason, int ms_until_forced)
+void __hw_protection_shutdown(const char *reason, int ms_until_forced, bool shutdown)
{
static atomic_t allow_proceed = ATOMIC_INIT(1);
* orderly_poweroff failure
*/
hw_failure_emergency_poweroff(ms_until_forced);
- orderly_poweroff(true);
+ if (shutdown)
+ orderly_poweroff(true);
+ else
+ orderly_reboot();
}
-EXPORT_SYMBOL_GPL(hw_protection_shutdown);
+EXPORT_SYMBOL_GPL(__hw_protection_shutdown);
static int __init reboot_setup(char *str)
{