linux-kernel - Re: [PATCH v7 2/4] dt-bindings: riscv: Add Svade and Svadu Entries

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Message-ID: <20240719-flatten-elixir-d4476977ab95@spud>
Date: Fri, 19 Jul 2024 14:17:12 +0100
From: Conor Dooley <conor@...nel.org>
To: Yong-Xuan Wang <yongxuan.wang@...ive.com>
Cc: Samuel Holland <samuel.holland@...ive.com>, greentime.hu@...ive.com,
	vincent.chen@...ive.com, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
	kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org
Subject: Re: [PATCH v7 2/4] dt-bindings: riscv: Add Svade and Svadu Entries

On Fri, Jul 19, 2024 at 02:58:59PM +0800, Yong-Xuan Wang wrote:
> Hi Samuel,
> 
> On Fri, Jul 19, 2024 at 7:38 AM Samuel Holland
> <samuel.holland@...ive.com> wrote:
> >
> > On 2024-07-12 3:38 AM, Yong-Xuan Wang wrote:
> > > Add entries for the Svade and Svadu extensions to the riscv,isa-extensions
> > > property.
> > >
> > > Signed-off-by: Yong-Xuan Wang <yongxuan.wang@...ive.com>
> > > ---
> > >  .../devicetree/bindings/riscv/extensions.yaml | 28 +++++++++++++++++++
> > >  1 file changed, 28 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
> > > index 468c646247aa..e91a6f4ede38 100644
> > > --- a/Documentation/devicetree/bindings/riscv/extensions.yaml
> > > +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
> > > @@ -153,6 +153,34 @@ properties:
> > >              ratified at commit 3f9ed34 ("Add ability to manually trigger
> > >              workflow. (#2)") of riscv-time-compare.
> > >
> > > +        - const: svade
> > > +          description: |
> > > +            The standard Svade supervisor-level extension for SW-managed PTE A/D
> > > +            bit updates as ratified in the 20240213 version of the privileged
> > > +            ISA specification.
> > > +
> > > +            Both Svade and Svadu extensions control the hardware behavior when
> > > +            the PTE A/D bits need to be set. The default behavior for the four
> > > +            possible combinations of these extensions in the device tree are:
> > > +            1) Neither Svade nor Svadu present in DT => It is technically
> > > +               unknown whether the platform uses Svade or Svadu. Supervisor
> > > +               software should be prepared to handle either hardware updating
> > > +               of the PTE A/D bits or page faults when they need updated.
> > > +            2) Only Svade present in DT => Supervisor must assume Svade to be
> > > +               always enabled.
> > > +            3) Only Svadu present in DT => Supervisor must assume Svadu to be
> > > +               always enabled.
> > > +            4) Both Svade and Svadu present in DT => Supervisor must assume
> > > +               Svadu turned-off at boot time. To use Svadu, supervisor must
> > > +               explicitly enable it using the SBI FWFT extension.
> > > +
> > > +        - const: svadu
> > > +          description: |
> > > +            The standard Svadu supervisor-level extension for hardware updating
> > > +            of PTE A/D bits as ratified at commit c1abccf ("Merge pull request
> > > +            #25 from ved-rivos/ratified") of riscv-svadu. Please refer to Svade
> >
> > Should we be referencing the archived riscv-svadu repository now that Svadu has
> > been merged to the main privileged ISA manual? Either way:
> >
> > Reviewed-by: Samuel Holland <samuel.holland@...ive.com>
> >
> 
> Yes, this commit is from the archived riscv-svadu repo. Or should I update it to
> "commit c1abccf ("Merge pull request  #25 from ved-rivos/ratified") of
> riscvarchive/riscv-svadu."?

I think Samuel was saying that we should use the commit where it was
merged into riscv-isa-manual instead.

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