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. Reviewed-by: Rob Herring <robh@xxxxxxxxxx> Signed-off-by: Sebastian Ene <sebastianene@xxxxxxxxxx> --- .../misc/qemu,vcpu-stall-detector.yaml | 51 +++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml diff --git a/Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml b/Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml new file mode 100644 index 000000000000..1aebeb696ee0 --- /dev/null +++ b/Documentation/devicetree/bindings/misc/qemu,vcpu-stall-detector.yaml @@ -0,0 +1,51 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/misc/qemu,vcpu-stall-detector.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: VCPU stall detector + +description: + This binding describes a CPU stall detector mechanism for virtual CPUs + which is accessed through MMIO. + +maintainers: + - Sebastian Ene <sebastianene@xxxxxxxxxx> + +properties: + compatible: + enum: + - qemu,vcpu-stall-detector + + reg: + maxItems: 1 + + 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: + 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@9030000 { + compatible = "qemu,vcpu-stall-detector"; + reg = <0x9030000 0x10000>; + clock-frequency = <10>; + timeout-sec = <8>; + }; -- 2.37.0.rc0.161.g10f37bed90-goog
