linux-kernel - Re: [PATCH 2/2] perf vendor events riscv: add T-HEAD C9xx JSON file

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Date:   Tue, 16 May 2023 18:06:39 +0300
From:   Nikita Shubin <nikita.shubin@...uefel.me>
To:     Inochi Amaoto <inochiama@...look.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Nikita Shubin <n.shubin@...ro.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 2/2] perf vendor events riscv: add T-HEAD C9xx JSON file

On Tue, 2023-05-16 at 17:45 +0800, Inochi Amaoto wrote:
> > Do c906 and c910 have same HPM events ?
> > 
> > https://github.com/T-head-Semi/openc906/blob/main/C906_RTL_FACTORY/gen_rtl/pmu/rtl/aq_hpcp_top.v
> > 
> > and
> > 
> > 
> > https://github.com/T-head-Semi/openc910/blob/main/C910_RTL_FACTORY/gen_rtl/pmu/rtl/ct_hpcp_top.v
> > 
> > Look different to me - am i missing something ?
> 
> Yes, they as different, but event ids are compatible. See [1] p.99
> and [2] p.73.
> 
> It seems I forgot extra event index from C906. I will fix in the v2.
> 
> [1]
> https://github.com/T-head-Semi/openc910/blob/main/doc/%E7%8E%84%E9%93%81C910%E7%94%A8%E6%88%B7%E6%89%8B%E5%86%8C.pdf
> [2]
> https://github.com/T-head-Semi/openc906/blob/main/doc/%E7%8E%84%E9%93%81C906%E7%94%A8%E6%88%B7%E6%89%8B%E5%86%8C.pdf

They are not the same - they are different in many ways. And c906 list
seems more complete to me.

I think you should drop wildcard (it shouldn't be used anyway) then and
name it c906.

"0x5b7-0x0-0x0,v1,t-head/c906,core" would match both c906 and c910.

> 
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

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