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

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Date: Mon, 24 Jun 2024 23:44:11 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Roman Kagan <rkagan@...zon.de>, linux-arm-kernel@...ts.infradead.org
Cc: 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 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/

Thanks,

        tglx