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

[Roman Kagan]

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 at amazon.com>
> > Signed-off-by: Mohamed Mediouni <mediou at amazon.com>
> > Signed-off-by: Roman Kagan <rkagan at amazon.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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