linux-kernel - Re: [PATCH v10 16/21] irqchip: Add GICv2 specific ACPI boot support

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Message-ID: <55016705.5010406@arm.com>
Date:	Thu, 12 Mar 2015 10:14:29 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Jason Cooper <jason@...edaemon.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>
CC:	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sudeep Holla <Sudeep.Holla@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	linaro-acpi <linaro-acpi@...ts.linaro.org>,
	"jcm@...hat.com" <jcm@...hat.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <Will.Deacon@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	Timur Tabi <timur@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>,
	Robert Richter <rric@...nel.org>,
	Olof Johansson <olof@...om.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [PATCH v10 16/21] irqchip: Add GICv2 specific ACPI boot support

On 11/03/15 23:11, Jason Cooper wrote:
> Hey Grant,
> 
> On Wed, Mar 11, 2015 at 06:04:50PM +0000, Grant Likely wrote:
>> On 11 Mar 2015 12:42, "Hanjun Guo" <hanjun.guo@...aro.org> wrote:
>>>
>>> From: Tomasz Nowicki <tomasz.nowicki@...aro.org>
>>>
>>> ACPI kernel uses MADT table for proper GIC initialization. It needs to
>>> parse GIC related subtables, collect CPU interface and distributor
>>> addresses and call driver initialization function (which is hardware
>>> abstraction agnostic). In a similar way, FDT initialize GICv1/2.
>>>
>>> NOTE: This commit allow to initialize GICv1/2 basic functionality.
>>> While now simple GICv2 init call is used, any further GIC features
>>> require generic infrastructure for proper ACPI irqchip initialization.
>>> That mechanism and stacked irqdomains to support GICv2 MSI/virtualization
>>> extension, GICv3/4 and its ITS are considered as next steps.
>>>
>>> CC: Jason Cooper <jason@...edaemon.net>
>>> CC: Marc Zyngier <marc.zyngier@....com>
>>> CC: Thomas Gleixner <tglx@...utronix.de>
>>
>> BTW, Thomas is taking a bit of a break, do he is unlikely to give an ack
>> here in a timely manner. I've not heard from Jason. Personally, I think we
>> can proceed without their ack if everything else is in order (heck, I used
>> to help with the irq subsystem, use me as an ack of you want). The patch is
>> low impact and only had effect for ARM ACPI builds.
> 
> I'm not talking much, but I am tracking and collecting everything for irqchip.
> We do have some other changes in this driver this time around.  So it'd be nice
> if I could take this.
> 
> I had reached out to Olof for his thoughts on this and he hasn't had enough
> cycles to look at it.  iirc, Marc reviewed a previous version and was happy with
> the changes.

FWIW, and given the prominent "NOTE" in the commit message, please have my:

Acked-by: Marc Zyngier <marc.zyngier@....com>

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
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