linux-kernel - Re: [PATCH] of/irq: Add a quirk for controllers with their own definition of interrupt-map

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Message-ID: <CA+V-a8siHRjF+bJu88QFwz0a_MZ+kiJEwmER58_feyr8O+WNGA@mail.gmail.com>
Date:   Mon, 29 Nov 2021 12:13:22 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Marc Zyngier <maz@...nel.org>, Rob Herring <robh@...nel.org>
Cc:     Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        John Crispin <john@...ozen.org>, Biwen Li <biwen.li@....com>,
        Chris Brandt <Chris.Brandt@...esas.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH] of/irq: Add a quirk for controllers with their own
 definition of interrupt-map

On Mon, Nov 29, 2021 at 10:34 AM Marc Zyngier <maz@...nel.org> wrote:
>
> On Sat, 27 Nov 2021 00:42:49 +0000,
> Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> >
> > Hi Marc,
> >
> > > -----Original Message-----
> > > From: Marc Zyngier <maz@...nel.org>
> > > Sent: 23 November 2021 09:11
> > > To: Geert Uytterhoeven <geert@...ux-m68k.org>
> > > Cc: linux-kernel@...r.kernel.org; devicetree@...r.kernel.org; kernel-team@...roid.com; Rob Herring
> > > <robh@...nel.org>; John Crispin <john@...ozen.org>; Biwen Li <biwen.li@....com>; Chris Brandt
> > > <Chris.Brandt@...esas.com>; linux-renesas-soc@...r.kernel.org; Prabhakar Mahadev Lad
> > > <prabhakar.mahadev-lad.rj@...renesas.com>
> > > Subject: Re: [PATCH] of/irq: Add a quirk for controllers with their own definition of interrupt-map
> > >
> > > On Tue, 23 Nov 2021 08:44:19 +0000,
> > > Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > >
> > > > Hi Marc,
> > > >
> > > > On Tue, Nov 23, 2021 at 9:33 AM Marc Zyngier <maz@...nel.org> wrote:
> > > > > On Tue, 23 Nov 2021 07:57:48 +0000,
> > > > > Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > > > > Summarized:
> > > > > >   - Before the bad commit, and after your fix, irqc-rza1 is invoked,
> > > > > >     and the number of interrupts seen is correct, but input events
> > > > > >     are doubled.
> > > > > >   - After the bad commit, irqc-rza1 is not invoked, and there is an
> > > > > >     interrupt storm, but input events are OK.
> > > > >
> > > > > OK, that's reassuring, even if the "twice the events" stuff isn't
> > > > > what you'd expect. We at least know this is a separate issue, and
> > > > > that this patch on top of -rc1 brings you back to the 5.15 behaviour.
> > > > >
> > > > > I'd expect it to be the case for the other platforms as well.
> > > >
> > > > OK.
> > > >
> > > > BTW, what would have been the correct way to do this for irqc-rza1?
> > > > I think we're about to make the same mistake with RZ/G2L IRQC
> > > > support[1]?
> > >
> > > Indeed, and I was about to look into it.
> > >
> > > There are multiple ways to skin this cat, including renaming 'interrupt-map' to 'my-own-private-
> > > interrupt-map'. Or use something akin the new 'msi-range' (which we could call interrupt-range), and
> > > replace:
> > >
> > >   interrupt-map = <0 0 &gic GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>,
> > >                   <1 0 &gic GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>,
> > >                   <2 0 &gic GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,
> > >                   <3 0 &gic GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
> > >                   <4 0 &gic GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>,
> > >                   <5 0 &gic GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>,
> > >                   <6 0 &gic GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>,
> > >                   <7 0 &gic GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
> > >
> > > with:
> > >
> > >   interrupt-range = <&gic GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH 0 8>;
> > >
> > Just to clarify, do you suggest to add interrupt-range as a generic
> > DT property or SoC/company specific property?
>
> As a generic one. I have no interest in SoC-specific stuff (though you
> are free to invent your own and run it by Rob).
>
OK will go with a generic one.

> > If you meant to add generic property where would you suggest to
> > document this property?
>
> Ideally collocated with the rest of the interrupt properties.
>
OK, I will go with interrupts.txt for now. Is that OK with you Rob?
(the reason I ask because interrupt-map/mask haven't been documented).

Cheers,
Prabhakar

> Thanks,
>
>         M.
>
> --
> Without deviation from the norm, progress is not possible.