linux-kernel - Re: [PATCH] arm64: dts: sdm845: Add CPU topology

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Message-ID: <CAHLCerP+F9AP97+qVCMqwu-OMJXRhwZrXd33Wk-vj5eyyw-KyA@mail.gmail.com>
Date:   Mon, 13 May 2019 16:31:20 +0530
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: Re: [PATCH] arm64: dts: sdm845: Add CPU topology

On Tue, Jan 15, 2019 at 12:13 AM Matthias Kaehlcke <mka@...omium.org> wrote:
>
> The 8 CPU cores of the SDM845 are organized in two clusters of 4 big
> ("gold") and 4 little ("silver") cores. Add a cpu-map node to the DT
> that describes this topology.

This is partly true. There are two groups of gold and silver cores,
but AFAICT they are in a single cluster, not two separate ones. SDM845
is one of the early examples of ARM's Dynamiq architecture.

> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>

I noticed that this patch sneaked through for this merge window but
perhaps we can whip up a quick fix for -rc2?

> ---
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 38 ++++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index c27cbd3bcb0a6..f6c0d87e663f3 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -192,6 +192,44 @@
>                                 next-level-cache = <&L3_0>;
>                         };
>                 };
> +
> +               cpu-map {
> +                       cluster0 {
> +                               core0 {
> +                                       cpu = <&CPU0>;
> +                               };
> +
> +                               core1 {
> +                                       cpu = <&CPU1>;
> +                               };
> +
> +                               core2 {
> +                                       cpu = <&CPU2>;
> +                               };
> +
> +                               core3 {
> +                                       cpu = <&CPU3>;
> +                               };
> +                       };
> +
> +                       cluster1 {

This shouldn't exist.

> +                               core0 {

Rename to core4, 5, etc...

> +                                       cpu = <&CPU4>;
> +                               };
> +
> +                               core1 {
> +                                       cpu = <&CPU5>;
> +                               };
> +
> +                               core2 {
> +                                       cpu = <&CPU6>;
> +                               };
> +
> +                               core3 {
> +                                       cpu = <&CPU7>;
> +                               };
> +                       };
> +               };
>         };
>
>         pmu {
> --
> 2.20.1.97.g81188d93c3-goog
>