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

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Date:   Sat, 26 Aug 2023 12:57:26 +0100
From:   Conor Dooley <conor@...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>,
        Guo Ren <guoren@...nel.org>, 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] riscv: dts: allwinner: d1: Add PMU event node

On Sat, Aug 26, 2023 at 07:25:43PM +0800, Inochi Amaoto wrote:

> >On Sat, Aug 26, 2023 at 04:38:53PM +0800, Inochi Amaoto 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>
> >
> >Could you please include a link to some documentation as to where these
> >values came from? I know several people have had some trouble with
> >understanding the pmu DT stuff & having some documentation would make
> >this an in-tree end-to-end example.

> The DT field of riscv,pmu for opensbi can be found on:
> https://github.com/riscv-software-src/opensbi/blob/master/docs/pmu_support.md

There's an actual dt-binding for this.

> The value can be found in the R1S0 version of C906 documentation:
> https://dl.linux-sunxi.org/D1/Xuantie_C906_R1S0_User_Manual.pdf
> 
> The meaning of T-HEAD events can be found in this patch:
> https://lore.kernel.org/linux-perf-users/IA1PR20MB4953DD82D0116EC291C21777BBE2A@IA1PR20MB4953.namprd20.prod.outlook.com
> 
> The patch above also provides documentation for T-HEAD events and a example
> that shows how to use perf with T-HEAD events.

What I meant was can you provide links to this in the commit messages so
that people have a way to find the documentation.


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