From mboxrd@z Thu Jan 1 00:00:00 1970 From: Catalin Marinas Subject: Re: [PATCH v4 10/13] firmware: arm_sdei: Add support for CPU and system power states Date: Wed, 18 Oct 2017 12:11:23 +0100 Message-ID: <20171018111122.oawkbq7ncstrhhfm@armageddon.cambridge.arm.com> References: <20171017174432.1684-1-james.morse@arm.com> <20171017174432.1684-11-james.morse@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20171017174432.1684-11-james.morse-5wv7dgnIgG8@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: James Morse Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Mark Rutland , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Lorenzo Pieralisi , Marc Zyngier , Will Deacon , Rob Herring , Loc Ho , kvmarm-FPEHb7Xf0XXUo1n7N8X6UoWGPAHP3yOg@public.gmane.org, Christoffer Dall List-Id: kvmarm@lists.cs.columbia.edu 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 Acked-by: Catalin Marinas -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html