linux-kernel - Re: [PATCH] arm64: dts: renesas: r9a07g044: Add Cortex-A55 PMU node

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Date:   Fri, 27 Jan 2023 20:44:27 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Biju Das <biju.das.jz@...renesas.com>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH] arm64: dts: renesas: r9a07g044: Add Cortex-A55 PMU node

Hi Biju,

Thank you for the review.

On Fri, Jan 27, 2023 at 6:38 PM Biju Das <biju.das.jz@...renesas.com> wrote:
>
> Hi Prabhakar,
>
> Thanks for the patch.
>
> > Subject: [PATCH] arm64: dts: renesas: r9a07g044: Add Cortex-A55 PMU node
> >
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Enable the performance monitor unit for the Cortex-A55 cores on the RZ/G2L
> > (r9a07g044) SoC.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> >  arch/arm64/boot/dts/renesas/r9a07g044.dtsi | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/renesas/r9a07g044.dtsi
> > b/arch/arm64/boot/dts/renesas/r9a07g044.dtsi
> > index 80b2332798d9..ff9bdc03a3ed 100644
> > --- a/arch/arm64/boot/dts/renesas/r9a07g044.dtsi
> > +++ b/arch/arm64/boot/dts/renesas/r9a07g044.dtsi
> > @@ -161,6 +161,11 @@ opp-50000000 {
> >               };
> >       };
> >
> > +     pmu_a55 {
> > +             compatible = "arm,cortex-a55-pmu";
> > +             interrupts-extended = <&gic GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>;
>
> Just a question, Is it tested?
Yes this was tested with perf test (https://pastebin.com/dkckcYHr)

> timer node[1] defines irq type as LOW, here it is high.
You are right looking at the RZG2L_InterruptMapping_rev01.xlsx this
should be LOW. (I followed the SPI IRQS where all the LEVEL interrupts
are HIGH)

> Also do we need to define (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW) as it has 2 cores??
>
No this is not required for example here [0] where it has 6 cores.

[0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/renesas/r8a779f0.dtsi?h=v6.2-rc5#n203

Cheers,
Prabhakar