linux-kernel - Re: [PATCH v4] riscv: dts: allwinner: d1: Add PMU event node

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Message-ID: <CAJF2gTRTwk6P+PnJcyQKVKADOAjHGmFxkS=axqg58hWvyu=wwA@mail.gmail.com>
Date:   Wed, 6 Sep 2023 08:50:54 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Inochi Amaoto <inochiama@...look.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Stuebner <heiko@...ech.de>, Wei Fu <wefu@...hat.com>,
        Pei Chen <cp0613@...ux.alibaba.com>,
        Wenhan Chen <chenwenhan.cwh@...baba-inc.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] riscv: dts: allwinner: d1: Add PMU event node

On Mon, Aug 28, 2023 at 12:29 PM Inochi Amaoto <inochiama@...look.com> wrote:
>
> D1 has several pmu events supported by opensbi.
> These events can be used by perf for profiling.
>
> Signed-off-by: Inochi Amaoto <inochiama@...look.com>
> Link: https://dl.linux-sunxi.org/D1/Xuantie_C906_R1S0_User_Manual.pdf
> Link: https://github.com/T-head-Semi/openc906/blob/main/C906_RTL_FACTORY/gen_rtl/pmu/rtl/aq_hpcp_top.v#L657
> ---
> changed from v3:
> 1. remove wrong event mapping of 0x0000a
> 2. add reference url of c906 events implementation (D1 only support events
> described in R1S0 user manual, but event mapping is the same)
>
> changed from v2:
> 1. move pmu node from /soc to / to avoid warnings when checking.
>
> The meaning of T-HEAD events can be found in this pending patch:
> https://lore.kernel.org/linux-perf-users/IA1PR20MB4953DD82D0116EC291C21777BBE2A@IA1PR20MB4953.namprd20.prod.outlook.com
>
> The patch above also provides a example that shows how to setup
> environment and use perf with T-HEAD events.
> ---
>  arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 39 +++++++++++++++++++
>  1 file changed, 39 insertions(+)
>
> diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> index 8275630af977..53a984d78e3f 100644
> --- a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> +++ b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
> @@ -73,4 +73,43 @@ plic: interrupt-controller@...00000 {
>                         #interrupt-cells = <2>;
>                 };
>         };
> +
> +       pmu {
> +               compatible = "riscv,pmu";
> +               riscv,event-to-mhpmcounters =
> +                       <0x00003 0x00003 0x00000008>,
> +                       <0x00004 0x00004 0x00000010>,
> +                       <0x00005 0x00005 0x00000200>,
> +                       <0x00006 0x00006 0x00000100>,
> +                       <0x10000 0x10000 0x00004000>,
> +                       <0x10001 0x10001 0x00008000>,
> +                       <0x10002 0x10002 0x00010000>,
> +                       <0x10003 0x10003 0x00020000>,
> +                       <0x10019 0x10019 0x00000040>,
> +                       <0x10021 0x10021 0x00000020>;
> +               riscv,event-to-mhpmevent =
> +                       <0x00003 0x00000000 0x00000001>,
> +                       <0x00004 0x00000000 0x00000002>,
> +                       <0x00005 0x00000000 0x00000007>,
> +                       <0x00006 0x00000000 0x00000006>,
> +                       <0x10000 0x00000000 0x0000000c>,
> +                       <0x10001 0x00000000 0x0000000d>,
> +                       <0x10002 0x00000000 0x0000000e>,
> +                       <0x10003 0x00000000 0x0000000f>,
> +                       <0x10019 0x00000000 0x00000004>,
> +                       <0x10021 0x00000000 0x00000003>;
> +               riscv,raw-event-to-mhpmcounters =
> +                       <0x00000000 0x00000001 0xffffffff 0xffffffff 0x00000008>,
> +                       <0x00000000 0x00000002 0xffffffff 0xffffffff 0x00000010>,
> +                       <0x00000000 0x00000003 0xffffffff 0xffffffff 0x00000020>,
> +                       <0x00000000 0x00000004 0xffffffff 0xffffffff 0x00000040>,
> +                       <0x00000000 0x00000005 0xffffffff 0xffffffff 0x00000080>,
> +                       <0x00000000 0x00000006 0xffffffff 0xffffffff 0x00000100>,
> +                       <0x00000000 0x00000007 0xffffffff 0xffffffff 0x00000200>,
> +                       <0x00000000 0x0000000b 0xffffffff 0xffffffff 0x00002000>,
> +                       <0x00000000 0x0000000c 0xffffffff 0xffffffff 0x00004000>,
> +                       <0x00000000 0x0000000d 0xffffffff 0xffffffff 0x00008000>,
> +                       <0x00000000 0x0000000e 0xffffffff 0xffffffff 0x00010000>,
> +                       <0x00000000 0x0000000f 0xffffffff 0xffffffff 0x00020000>;
> +       };
>  };
> --
> 2.42.0
>
Reviewed-by: Guo Ren <guoren@...nel.org>

-- 
Best Regards
 Guo Ren