linux-kernel - Re: [PATCH v6 1/2] dt-bindings: vcpu_stall_detector: Add qemu,vcpu-stall-detector compatible

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Date:   Thu, 16 Jun 2022 09:30:17 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sebastian Ene <sebastianene@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        maz@...nel.org, will@...nel.org, vdonnefort@...gle.com,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v6 1/2] dt-bindings: vcpu_stall_detector: Add
 qemu,vcpu-stall-detector compatible

On Thu, Jun 16, 2022 at 09:27:38AM +0000, Sebastian Ene wrote:
> The VCPU stall detection mechanism allows to configure the expiration
> duration and the internal counter clock frequency measured in Hz.
> Add these properties in the schema.
> 
> While this is a memory mapped virtual device, it is expected to be loaded
> when the DT contains the compatible: "qemu,vcpu-stall-detector" node.
> In a protected VM we trust the generated DT nodes and we don't rely on
> the host to present the hardware peripherals.
> 
> Signed-off-by: Sebastian Ene <sebastianene@...gle.com>
> ---
>  .../bindings/misc/vcpu_stall_detector.yaml    | 49 +++++++++++++++++++

qemu,vcpu-stall-detector.yaml

>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/misc/vcpu_stall_detector.yaml
> 
> diff --git a/Documentation/devicetree/bindings/misc/vcpu_stall_detector.yaml b/Documentation/devicetree/bindings/misc/vcpu_stall_detector.yaml
> new file mode 100644
> index 000000000000..55323676194b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/vcpu_stall_detector.yaml
> @@ -0,0 +1,49 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/misc/vcpu_stall_detector.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: VCPU stall detector
> +
> +description: |

Don't need '|' if no formatting.

> +  This binding describes a CPU stall detector mechanism for virtual cpus

s/cpus/CPUs/

> +  which is accessed through MMIO.
> +
> +maintainers:
> +  - Sebastian Ene <sebastianene@...gle.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qemu,vcpu-stall-detector
> +
> +  clock-frequency:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      The internal clock of the stall detector peripheral measure in Hz used
> +      to decrement its internal counter register on each tick.
> +      Defaults to 10 if unset.

       default: 10

> +
> +  timeout-sec:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      The stall detector expiration timeout measured in seconds.
> +      Defaults to 8 if unset. Please note that it also takes into account the
> +      time spent while the VCPU is not running.

       default: 8

> +
> +required:
> +  - compatible
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    vmwdt@...0000 {
> +      compatible = "qemu,vcpu-stall-detector";
> +      clock-frequency = <10>;
> +      timeout-sec = <8>;
> +      reg = <0x0 0x9030000 0x0 0x10000>;
> +    };
> +
> +...
> -- 
> 2.36.1.476.g0c4daa206d-goog
> 
>