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

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Date:   Wed, 17 May 2023 13:16:52 +0800
From:   Inochi Amaoto <inochiama@...look.com>
To:     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>,
        Inochi Amaoto <inochiama@...look.com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: RESEND Re: [PATCH 2/2] perf vendor events riscv: add T-HEAD C9xx JSON file

As my last email is correct, this is a resend.

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

They are different, as this summary:

event id range   |  support cpu
 0x01 - 0x06     |  c906,c910,c920
 0x07            |  c906
 0x08 - 0x0a     |  c910,c920
 0x0b - 0x0f     |  c906,c910,c920
 0x10 - 0x1a     |  c910,c920
 0x1b - 0x1c     |  c910,c920 (software defined, >= 0x1b)
 0x1d - 0x2a     |  c906

This table shows it is not very different. The events of c910 and c906
are complementary.

> 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.
>

Drop wildcard is a good idea. But I choose to preserve t-head c9xx id,
as it cover all events for c9xx series.