linux-kernel - Re: [PATCH] irqchip/gicv3-its: Workaround for GIC-700 erratum 2195890

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Message-ID: <ZnqxNMIp/dGNY1u6@u40bc5e070a0153.ant.amazon.com>
Date: Tue, 25 Jun 2024 13:59:48 +0200
From: Roman Kagan <rkagan@...zon.de>
To: Thomas Gleixner <tglx@...utronix.de>
CC: <linux-arm-kernel@...ts.infradead.org>, Catalin Marinas
	<catalin.marinas@....com>, Will Deacon <will@...nel.org>,
	<nh-open-source@...zon.com>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Jonathan Corbet <corbet@....net>, "Marc
 Zyngier" <maz@...nel.org>
Subject: Re: [PATCH] irqchip/gicv3-its: Workaround for GIC-700 erratum 2195890

On Mon, Jun 24, 2024 at 11:44:11PM +0200, Thomas Gleixner wrote:
> On Mon, Jun 24 2024 at 18:55, Roman Kagan wrote:
> > According to Arm CoreLink GIC-700 erratum 2195890, on GIC revisions
> > r0p0, r0p1, r1p0 under certain conditions LPIs may remain in the Pending
> > Table until one of a number of external events occurs.
> >
> > No LPIs are lost but they may not be delivered in a finite time.
> >
> > The workaround is to issue an INV using GICR_INVLPIR to an unused, in
> > range LPI ID to retrigger the search.
> >
> > Add this workaround to the quirk table.  When the quirk is applicable,
> > carve out one LPI ID from the available range and run periodic work to
> > do INV to it, in order to prevent GIC from stalling.
> >
> > TT: https://t.corp.amazon.com/D82032616
> 
> Can you please refrain from providing internal links?
> 
> > Signed-off-by: Elad Rosner <eladros@...zon.com>
> > Signed-off-by: Mohamed Mediouni <mediou@...zon.com>
> > Signed-off-by: Roman Kagan <rkagan@...zon.de>
> 
> That Signed-off-by chain is invalid. See Documentation/process/

ACK to all, will fix (sorry haven't posted patches for a while, muscle
memory got rusty).

Thanks,
Roman.



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