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Message-ID: <20230826-cubical-publisher-2580c5991069@spud>
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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