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kernel/reboot: Add SYS_OFF_MODE_RESTART_PREPARE mode 

Add SYS_OFF_MODE_RESTART_PREPARE callbacks to be invoked before
a system restart.

Suggested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Reviewed-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Kai-Heng Feng 2022-09-29 15:05:23 +08:00 committed by Rafael J. Wysocki
parent f76349cf41
commit e7fd8b6840
2 changed files with 25 additions and 0 deletions
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8
include/linux/reboot.h
View File

@ -105,6 +105,14 @@ enum sys_off_mode {
*/
SYS_OFF_MODE_POWER_OFF,
/**
* @SYS_OFF_MODE_RESTART_PREPARE:
*
* Handlers prepare system to be restarted. Handlers are
* allowed to sleep.
*/
SYS_OFF_MODE_RESTART_PREPARE,
/**
* @SYS_OFF_MODE_RESTART:
*

17
kernel/reboot.c
View File

@ -243,6 +243,17 @@ void migrate_to_reboot_cpu(void)
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
@ -254,6 +265,7 @@ void migrate_to_reboot_cpu(void)
void kernel_restart(char *cmd)
{
kernel_restart_prepare(cmd);
do_kernel_restart_prepare();
migrate_to_reboot_cpu();
syscore_shutdown();
if (!cmd)
@ -396,6 +408,11 @@ register_sys_off_handler(enum sys_off_mode mode,
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;