Re: [PATCH v4 10/13] firmware: arm_sdei: Add support for CPU and system power states

Catalin Marinas
2017-10-18T11:11:23Z

On Tue, Oct 17, 2017 at 06:44:29PM +0100, James Morse wrote:
> When a CPU enters an idle lower-power state or is powering off, we
> need to mask SDE events so that no events can be delivered while we
> are messing with the MMU as the registered entry points won't be valid.
>
> If the system reboots, we want to unregister all events and mask the CPUs.
> For kexec this allows us to hand a clean slate to the next kernel
> instead of relying on it to call sdei_{private,system}_data_reset().
>
> For hibernate we unregister all events and re-register them on restore,
> in case we restored with the SDE code loaded at a different address.
> (e.g. KASLR).
>
> Add all the notifiers necessary to do this. We only support shared events
> so all events are left registered and enabled over CPU hotplug.
>
> Signed-off-by: James Morse <james.morse-5wv7dgnIgG8@public.gmane.org>

Acked-by: Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>