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

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Message-ID: <20150924170138.GI1820@rric.localdomain>
Date:	Thu, 24 Sep 2015 19:01:38 +0200
From:	Robert Richter <robert.richter@...iumnetworks.com>
To:	Marc Zyngier <marc.zyngier@....com>,
	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>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [PATCH v5 0/6] irqchip, gicv3: Updates and Cavium ThunderX
 errata workarounds

Marc, Will,

On 22.09.15 20:41:34, Marc Zyngier wrote:
> 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?

thanks for your review.

> > 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().

Patch 2 addresses a gicv3 erratum (#23154). Thus needs to be enable in
host and guest, thus MIDR is used together with the arm64 errata
framework. There are no other arm64 errata than this one, so it is
closely related to gicv3.

Or, do you mean separating arm64 code by putting the relevant parts
into #ifdefs for CONFIG_ARM64? Isn't ARM_GIC_V3 only enabled for ARM64?

Do you have any changes of this patch in mind?

Also note that patch #6 is for #2. So if you pass the patches through
different trees, put those both patches together.

> > 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,

-Robert
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