linux-kernel - Re: [PATCH v4 3/4] irqchip: GIC: Convert to EOImode == 1

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Date:	Fri, 11 Sep 2015 12:09:18 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Julien Grall <julien.grall@...rix.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>, kvm@...r.kernel.org,
	Eric Auger <eric.auger@...aro.org>,
	linux-kernel@...r.kernel.org,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: Re: [PATCH v4 3/4] irqchip: GIC: Convert to EOImode == 1

On 11/09/15 11:59, Julien Grall wrote:
> 
> 
> On 11/09/2015 11:54, Ian Campbell wrote:
>> On Thu, 2015-09-10 at 17:23 +0100, Julien Grall wrote:
>>> I applied the two patches on top of linus/master and I'm able to boot
>>> correctly on X-gene. Thank you!
>>
>> Perhaps we should replicate this approach in Xen and get rid of
>>   PLATFORM_QUIRK_GIC_64K_STRIDE?
> 
> I was thinking to do it. But, I wasn't sure if it was worth to get a 
> such "ugly" patch compare to the quirk.

It is not a quirk. It is actually recommended in the SBSA spec. The
patch is ugly because we can't do the right thing on the one platform
that actually implemented ARM's own recommendation (we can't tell the
bloody firmware to stop overriding our DT).

I would otherwise have added a "arm,use-sbsa-aliasing" property (or
something similar) instead of trying to guess things...

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