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 17:21:01 +0800
From:   Yu-Chien Peter Lin <peterlin@...estech.com>
To:     Inochi Amaoto <inochiama@...look.com>
CC:     Guo Ren <guoren@...nel.org>, <acme@...nel.org>,
        <adrian.hunter@...el.com>, <ajones@...tanamicro.com>,
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Subject: Re: [PATCH v4 09/13] dt-bindings: riscv: Add T-Head PMU extension
 description

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?

Best regards,
Peter Lin

> Best regards,
> Inochi