linux-kernel - RE: [RFC 2/4] irqchip, gicv3-its:Workaround for HiSilicon erratum 161010801

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Date:   Wed, 25 Jan 2017 10:30:00 +0000
From:   Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To:     Mark Rutland <mark.rutland@....com>
CC:     "marc.zyngier@....com" <marc.zyngier@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Linuxarm <linuxarm@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        John Garry <john.garry@...wei.com>,
        "Guohanjun (Hanjun Guo)" <guohanjun@...wei.com>,
        "robin.murphy@....com" <robin.murphy@....com>
Subject: RE: [RFC 2/4] irqchip, gicv3-its:Workaround for HiSilicon erratum
 161010801



> -----Original Message-----
> From: Mark Rutland [mailto:mark.rutland@....com]
> Sent: Tuesday, January 24, 2017 2:15 PM
> To: Shameerali Kolothum Thodi
> Cc: marc.zyngier@....com; will.deacon@....com; linux-arm-
> kernel@...ts.infradead.org; Linuxarm; linux-kernel@...r.kernel.org;
> devicetree@...r.kernel.org; John Garry; Guohanjun (Hanjun Guo);
> robin.murphy@....com
> Subject: Re: [RFC 2/4] irqchip, gicv3-its:Workaround for HiSilicon
> erratum 161010801
sounds like this will have severe implications for virtualization.
> 
> > Also these platforms doesn't have a proper IIDR
> > register to use the existing IIDR based quirk mechanism.
> 
> What exactly is wrong with the IIDR on these platforms? That sounds
> like
> an erratum as of itself.
> 
> What precise value do reads of the IIDR return? Or do reads result in
> other erroneous behaviour?

As far as I know, there is no erroneous behavior while reading.  But the
IIDR JEP106 identity code is 0 on these platforms, hence not much of use.

This will be corrected in next revision of hw.

Thanks,
Shameer