linux-kernel - Re: [PATCH v2] irqchip, gicv3-its, numa: Workaround for Cavium ThunderX erratum 23144

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Date:	Mon, 7 Sep 2015 18:48:44 +0200
From:	Robert Richter <robert.richter@...iumnetworks.com>
To:	Marc Zyngier <marc.zyngier@....com>
CC:	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
	<will.deacon@....com>, <tglx@...utronix.de>,
	<jason@...edaemon.net>, <linux-arm-kernel@...ts.infradead.org>,
	<tirumalesh.chalamarla@...iumnetworks.com>, <rric@...nel.org>,
	<gpkulkarni@...il.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] irqchip, gicv3-its, numa: Workaround for Cavium
 ThunderX erratum 23144

On 07.09.15 17:44:41, Marc Zyngier wrote:
> On 25/08/15 11:18, Ganapatrao Kulkarni wrote:
> > The patch below adds a workaround for gicv3 in a numa environment. It
> > is on top of Robert's recent gicv3 errata patch submission v4 and my
> > arm64 numa patches v5.
> > 
> > This implements a workaround for gicv3-its erratum 23144 on Cavium's
> > ThunderX dual-socket platforms, where LPI cannot be routed to a
> > redistributors present on a foreign node.
> > 
> > v2:
> > updatated as per Marc Zyngier's review comments.
> > 
> > Signed-off-by: Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>
> > Signed-off-by: Robert Richter <rrichter@...ium.com>
> > ---
> >  drivers/irqchip/irq-gic-v3-its.c | 53 +++++++++++++++++++++++++++++++++-------
> >  1 file changed, 44 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> > index 614a367..d3fe0a4 100644
> > --- a/drivers/irqchip/irq-gic-v3-its.c
> > +++ b/drivers/irqchip/irq-gic-v3-its.c
> > @@ -40,7 +40,8 @@
> >  #include "irqchip.h"
> >  
> >  #define ITS_FLAGS_CMDQ_NEEDS_FLUSHING          (1ULL << 0)
> > -#define ITS_FLAGS_CAVIUM_THUNDERX              (1ULL << 1)
> > +#define ITS_WORKAROUND_CAVIUM_22375            (1ULL << 1)
> > +#define ITS_WORKAROUND_CAVIUM_23144            (1ULL << 2)
> 
> Please move this to Robert's series, as it doesn't make much sense to
> add a quirk flag just to modify it in the next patch. This will help
> declutter this patch.

I will merge the bits in and rebase and rework this one on top (we
will post this separately due to dependencies to other patch sets).

Thanks,

-Robert
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