Re: [PATCH v3 1/2] dt-bindings: cpufreq: add bindings for virtual cpufreq

[Saravana Kannan]

On Sat, Aug 5, 2023 at 12:38 PM Krzysztof Kozlowski
<krzysztof.kozlowski@xxxxxxxxxx> wrote:
>
> On 31/07/2023 19:46, David Dai wrote:
> > Adding bindings to represent a virtual cpufreq device.
> >
> > Virtual machines may expose MMIO regions for a virtual cpufreq device for
> > guests to read frequency information or to request frequency selection. The
> > virtual cpufreq device has an individual controller for each CPU.
>
> A nit, subject: drop second/last, redundant "bindings for". The
> "dt-bindings" prefix is already stating that these are bindings.
>
> >
> > Co-developed-by: Saravana Kannan <saravanak@xxxxxxxxxx>
> > Signed-off-by: Saravana Kannan <saravanak@xxxxxxxxxx>
> > Signed-off-by: David Dai <davidai@xxxxxxxxxx>
> > ---
> >  .../bindings/cpufreq/cpufreq-virtual.yaml     | 89 +++++++++++++++++++
> >  1 file changed, 89 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-virtual.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-virtual.yaml b/Documentation/devicetree/bindings/cpufreq/cpufreq-virtual.yaml
> > new file mode 100644
> > index 000000000000..f377cfc972ca
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-virtual.yaml
> > @@ -0,0 +1,89 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/cpufreq/cpufreq-virtual.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yamll#
> > +
> > +title: Virtual CPUFreq
> > +
> > +maintainers:
> > +  - David Dai <davidai@xxxxxxxxxx>
> > +  - Saravana Kannan <saravanak@xxxxxxxxxx>
> > +
> > +description:
> > +  Virtual CPUFreq is a virtualized driver in guest kernels that sends frequency
> > +  selection of its vCPUs as a hint to the host through MMIO regions. The host
> > +  uses the hint to schedule vCPU threads and select physical CPU frequency. It
> > +  enables accurate Per-Entity Load Tracking for tasks running in the guest by
> > +  querying host CPU frequency unless a virtualized FIE (ex. AMU) exists.
>
> Why do you need DT for this? You control hypervisor, thus control the
> interface to the guest. I think Rob made it pretty clear that
> discoverable usecases (which is yours) are not for DT.
>
> Incomplete style-review follows:
>
> > +
> > +properties:
> > +  compatible:
> > +    const: virtual,cpufreq
>
> Missing blank line.
>
> > +  reg:
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    cpus {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +
> > +      cpu@0 {
> > +        compatible = "arm,arm-v8";
> > +        device_type = "cpu";
> > +        reg = <0x0>;
> > +        operating-points-v2 = <&opp_table0>;
> > +      };
> > +
> > +      cpu@1 {
> > +        compatible = "arm,arm-v8";
> > +        device_type = "cpu";
> > +        reg = <0x0>;
> > +        operating-points-v2 = <&opp_table1>;
> > +      };
> > +    };
> > +
> > +    opp_table0: opp-table-0 {
> > +      compatible = "operating-points-v2";
> > +
> > +      opp1098000000 {
> > +        opp-hz = /bits/ 64 <1098000000>;
> > +        opp-level = <1>;
> > +      };
> > +
> > +      opp1197000000 {
> > +        opp-hz = /bits/ 64 <1197000000>;
> > +        opp-level = <2>;
> > +      };
> > +    };
> > +
> > +    opp_table1: opp-table-1 {
> > +      compatible = "operating-points-v2";
> > +
> > +      opp1106000000 {
> > +        opp-hz = /bits/ 64 <1106000000>;
> > +        opp-level = <1>;
> > +      };
> > +
> > +      opp1277000000 {
> > +        opp-hz = /bits/ 64 <1277000000>;
> > +        opp-level = <2>;
> > +      };
> > +    };
> > +
> > +    soc {
> > +      #address-cells = <1>;
> > +      #size-cells = <1>;
> > +
> > +      cpufreq {
>
> Missing unit address
>
> > +        reg = <0x1040000 0x10>;
> > +        compatible = "virtual,cpufreq";
>
> compatible is always the first property.
>
> Also, you did not test it...

Why do you say this? This patch series was obviously tested very well
with all the data we collected.

-Saravana