linux-kernel - Re: [PATCH v5 0/6] irqchip, gicv3: Updates and Cavium ThunderX errata workarounds

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Message-ID: <20150922204134.7491db93@arm.com>
Date:	Tue, 22 Sep 2015 20:41:34 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Will Deacon <will.deacon@....com>
Cc:	Robert Richter <rric@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Tirumalesh Chalamarla <tchalamarla@...ium.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Robert Richter <rrichter@...ium.com>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [PATCH v5 0/6] irqchip, gicv3: Updates and Cavium ThunderX
 errata workarounds

On Tue, 22 Sep 2015 19:27:26 +0100
Will Deacon <will.deacon@....com> wrote:

> On Tue, Sep 22, 2015 at 07:09:32PM +0100, Marc Zyngier wrote:
> > On Tue, 22 Sep 2015 17:57:01 +0100
> > Marc Zyngier <marc.zyngier@....com> wrote:
> > 
> > [Duh. Now with Will and Catalin on CC]
> > 
> > > On Mon, 21 Sep 2015 22:58:33 +0200
> > > Robert Richter <rric@...nel.org> wrote:
> > > 
> > > > From: Robert Richter <rrichter@...ium.com>
> > > > 
> > > > This patch series adds gicv3 updates and workarounds for HW errata in
> > > > Cavium's ThunderX GICV3.
> > > > 
> > > > The patches has been rebased onto 4.3-rc1. Note that there are two
> > > > important fixes. See below for all changes.
> > > > 
> > > > The first one is an unchanged resubmission of a patch from a gicv3
> > > > series I sent a while ago.
> > > > 
> > > > The next patches implement the workarounds for ThunderX's gicv3. Patch
> > > > #2 implements the cpu workaround for gicv3 on ThunderX. Patch #3 is a
> > > > prerequisit for patch #5. Patch #4 adds generic code to parse the hw
> > > > revision provided by an IIDR. This patch is used for the implementa-
> > > > tion of the actual gicv3-its workaround in #5. Patch #6 updates to the
> > > > new jump label API.
> > > > 
> > > > All current review comments addressed so far with v5
> > > 
> > > Catalin, Will: assuming you don't have any objection to this series,
> > > how do you want to deal with patch 2?
> 
> What are the actual dependencies here? AFAICT, the series is addressing
> multiple errata, so would it be possible to make the arm64 bits somewhat
> independent from the gic parts?

Patch 2 could be split into an arm64-specific part and a gic part, with
a bit of #ifdef-ery in gicv3_enable_quirks().

> Also, I assume this is targetting 4.4?

Up to you, really. It is not a regression, but it would still be nice
to have 4.3 working reliably on this HW.

Thanks,

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