linux-kernel - Re: [PATCH v4 11/18] ARM64 / ACPI: Parse MADT for SMP initialization

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Date:	Mon, 15 Sep 2014 15:56:31 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Jon Masters <jcm@...hat.com>
Cc:	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <Mark.Rutland@....com>,
	Olof Johansson <olof@...om.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>
Subject: Re: [PATCH v4 11/18] ARM64 / ACPI: Parse MADT for SMP initialization

On Fri, Sep 12, 2014 at 08:47:00PM +0100, Jon Masters wrote:
> On 09/12/2014 10:00 AM, Hanjun Guo wrote:
> > MADT contains the information for MPIDR which is essential for
> > SMP initialization, parse the GIC cpu interface structures to
> > get the MPIDR value and map it to cpu_logical_map(), and add
> > enabled cpu with valid MPIDR into cpu_possible_map.
> > 
> > ACPI 5.1 only has two explicit methods to boot up SMP, PSCI and
> > Parking protocol, but the Parking protocol is only specified for
> > ARMv7 now, so make PSCI as the only way for the SMP boot protocol
> > before some updates for the ACPI spec or the Parking protocol spec.
> 
> As an aside, initial support for the Parking Protocol is working on test
> systems within Red Hat at this time.

BTW, have the details of the parking protocol been updated for ARMv8
yet?

-- 
Catalin
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