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@xxxxxxxxxx> > --- > .../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@xxxxxxxxxx> > + > +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@9030000 { > + compatible = "qemu,vcpu-stall-detector"; > + clock-frequency = <10>; > + timeout-sec = <8>; > + reg = <0x0 0x9030000 0x0 0x10000>; > + }; > + > +... > -- > 2.36.1.476.g0c4daa206d-goog > >
