linux-kernel - Re: [PATCH v4 09/13] dt-bindings: riscv: Add T-Head PMU extension description

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Date:   Thu, 30 Nov 2023 12:58:41 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Inochi Amaoto <inochiama@...look.com>
Cc:     Yu-Chien Peter Lin <peterlin@...estech.com>,
        Guo Ren <guoren@...nel.org>, acme@...nel.org,
        adrian.hunter@...el.com, ajones@...tanamicro.com,
        alexander.shishkin@...ux.intel.com, andre.przywara@....com,
        anup@...infault.org, aou@...s.berkeley.edu, atishp@...shpatra.org,
        conor+dt@...nel.org, conor.dooley@...rochip.com,
        devicetree@...r.kernel.org, dminus@...estech.com,
        evan@...osinc.com, geert+renesas@...der.be, heiko@...ech.de,
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        jszhang@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-riscv@...ts.infradead.org,
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Subject: Re: [PATCH v4 09/13] dt-bindings: riscv: Add T-Head PMU extension
 description

On Thu, Nov 30, 2023 at 08:16:38PM +0800, Inochi Amaoto wrote:
> >
> >Hi Inochi,
> >
> >On Thu, Nov 30, 2023 at 04:29:22PM +0800, Inochi Amaoto wrote:
> >>>
> >>> Hi Guo Ren,
> >>>
> >>> On Thu, Nov 23, 2023 at 05:14:30AM +0800, Guo Ren wrote:
> >>>> On Wed, Nov 22, 2023 at 8:17 PM Yu Chien Peter Lin
> >>>> <peterlin@...estech.com> wrote:
> >>>>>
> >>>>> Document the ISA string for T-Head performance monitor extension
> >>>>> which provides counter overflow interrupt mechanism.
> >>>>>
> >>>>> Signed-off-by: Yu Chien Peter Lin <peterlin@...estech.com>
> >>>>> ---
> >>>>> Changes v2 -> v3:
> >>>>>   - New patch
> >>>>> Changes v3 -> v4:
> >>>>>   - No change
> >>>>> ---
> >>>>>  Documentation/devicetree/bindings/riscv/extensions.yaml | 6 ++++++
> >>>>>  1 file changed, 6 insertions(+)
> >>>>>
> >>>>> diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
> >>>>> index c91ab0e46648..694efaea8fce 100644
> >>>>> --- a/Documentation/devicetree/bindings/riscv/extensions.yaml
> >>>>> +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
> >>>>> @@ -258,5 +258,11 @@ properties:
> >>>>>              in commit 2e5236 ("Ztso is now ratified.") of the
> >>>>>              riscv-isa-manual.
> >>>>>
> >>>>> +        - const: xtheadpmu
> >>>>> +          description:
> >>>>> +            The T-Head performance monitor extension for counter overflow. For more
> >>>>> +            details, see the chapter 12 in the Xuantie C906 user manual.
> >>>>> +            https://github.com/T-head-Semi/openc906/tree/main/doc
> >>>>> +
> >>>>>  additionalProperties: true
> >>>>>  ...
> >>>>> --
> >>>>> 2.34.1
> >>>>>
> >>>> Reviewed-by: Guo Ren <guoren@...nel.org>
> >>>
> >>> Thanks for the review.
> >>> Would you share document about T-Head PMU?
> >>>
> >>
> >> Hi, Peter Lin:
> >>
> >> You can use the following two document to get all events:
> >> https://github.com/T-head-Semi/openc906/tree/main/doc
> >> https://github.com/T-head-Semi/openc910/tree/main/doc
> >>
> >> There are also some RTL code can describe these events:
> >> https://github.com/T-head-Semi/openc910/blob/e0c4ad8ec7f8c70f649d826ebd6c949086453272/C910_RTL_FACTORY/gen_rtl/pmu/rtl/ct_hpcp_top.v#L1123
> >> https://github.com/T-head-Semi/openc906/blob/af5614d72de7e5a4b8609c427d2e20af1deb21c4/C906_RTL_FACTORY/gen_rtl/pmu/rtl/aq_hpcp_top.v#L543
> >>
> >> The perf events json can also be used as document, this is already
> >> applied (with more detailed explanation):
> >> https://lore.kernel.org/all/IA1PR20MB495325FCF603BAA841E29281BBBAA@IA1PR20MB4953.namprd20.prod.outlook.com/
> >
> >Thanks for reaching out!
> >The updated description will be:
> >
> >- const: xtheadpmu
> >  description:
> >    The T-Head performance monitor extension for counter overflow, as ratified
> >    in commit bd9206 ("Initial commit") of Xuantie C906 user manual.
> >    https://github.com/T-head-Semi/openc906/tree/main/doc
> >
> >Is it OK with you?
> >
> 
> I suggest using perf event json as event description. The jsons provide
> more detailed explanation for these events than the user manual.

Does the "perf event json" describe the registers and interrupt behaviour?

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