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Date: Thu, 7 Jul 2022 15:42:26 +0000 From: Sebastian Ene <sebastianene@...gle.com> To: Rob Herring <robh+dt@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arnd Bergmann <arnd@...db.de>, Dragan Cvetic <dragan.cvetic@...inx.com> Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, maz@...nel.org, will@...nel.org, vdonnefort@...gle.com, Guenter Roeck <linux@...ck-us.net>, Sebastian Ene <sebastianene@...gle.com>, Rob Herring <robh@...nel.org> Subject: [PATCH v10 1/2] dt-bindings: vcpu_stall_detector: Add qemu,vcpu-stall-detector compatible 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@...nel.org> Signed-off-by: Sebastian Ene <sebastianene@...gle.com> --- .../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@...gle.com> + +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@...0000 { + compatible = "qemu,vcpu-stall-detector"; + reg = <0x9030000 0x10000>; + clock-frequency = <10>; + timeout-sec = <8>; + }; -- 2.37.0.rc0.161.g10f37bed90-goog
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