[PATCH v2 07/12] reboot: add support for configuring emergency hardware protection action
Tzung-Bi Shih
tzungbi at kernel.org
Mon Jan 20 07:12:09 UTC 2025
On Mon, Jan 13, 2025 at 05:25:32PM +0100, Ahmad Fatoum wrote:
> We currently leave the decision of whether to shutdown or reboot to
> protect hardware in an emergency situation to the individual drivers.
>
> This works out in some cases, where the driver detecting the critical
> failure has inside knowledge: It binds to the system management controller
> for example or is guided by hardware description that defines what to do.
>
> In the general case, however, the driver detecting the issue can't know
> what the appropriate course of action is and shouldn't be dictating the
> policy of dealing with it.
>
> Therefore, add a global hw_protection toggle that allows the user to
> specify whether shutdown or reboot should be the default action when the
> driver doesn't set policy.
>
> This introduces no functional change yet as hw_protection_trigger() has
> no callers, but these will be added in subsequent commits.
>
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
With a minor comment,
Reviewed-by: Tzung-Bi Shih <tzungbi at kernel.org>
> diff --git a/Documentation/ABI/testing/sysfs-kernel-reboot b/Documentation/ABI/testing/sysfs-kernel-reboot
> index 837330fb251134ffdf29cd68f0b2a845b088e5a0..133f54707d533665c68a5946394540ec50b149e5 100644
> --- a/Documentation/ABI/testing/sysfs-kernel-reboot
> +++ b/Documentation/ABI/testing/sysfs-kernel-reboot
> @@ -30,3 +30,11 @@ KernelVersion: 5.11
> Contact: Matteo Croce <mcroce at microsoft.com>
> Description: Don't wait for any other CPUs on reboot and
> avoid anything that could hang.
> +
> +What: /sys/kernel/reboot/hw_protection
> +Date: Feb 2025
> +KernelVersion: 6.14
The info might need to be adjusted if the series would be for 6.15.
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