On Thu, Sep 29, 2022 at 9:06 AM Kai-Heng Feng
<kai.heng.feng@xxxxxxxxxxxxx> wrote:
>
> Add SYS_OFF_MODE_RESTART_PREPARE callbacks can be invoked before system
> restart.
>
> This is a preparation for next patch.
>
> Suggested-by: Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>
> Reviewed-by: Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
Applied as 6.1-rc material along with the [2/2], thanks!
> ---
> v4:
> - Correct typo in comment.
> v3:
> - New patch.
>
> include/linux/reboot.h | 8 ++++++++
> kernel/reboot.c | 17 +++++++++++++++++
> 2 files changed, 25 insertions(+)
>
> diff --git a/include/linux/reboot.h b/include/linux/reboot.h
> index e5d9ef886179c..2b6bb593be5b6 100644
> --- a/include/linux/reboot.h
> +++ b/include/linux/reboot.h
> @@ -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:
> *
> diff --git a/kernel/reboot.c b/kernel/reboot.c
> index 3c35445bf5ad3..3bba88c7ffc6b 100644
> --- a/kernel/reboot.c
> +++ b/kernel/reboot.c
> @@ -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;
> --
> 2.37.2
>
