On Thu, 30 Mar 2023 17:51:23 +0100, James Morse wrote: > The Errata Management SMCCC interface allows firmware to advertise whether > the OS is affected by an erratum, or if a higher exception level has > mitigated the issue. This allows properties of the device that are not > discoverable by the OS to be described. e.g. some errata depend on the > behaviour of the interconnect, which is not visible to the OS. > > Deployed devices may find it significantly harder to update EL3 > firmware than the device tree. Erratum workarounds typically have to > fail safe, and assume the platform is affected putting correctness > above performance. > > Instead of adding a device-tree entry for any CPU errata that is > relevant (or not) to the platform, allow the device-tree to describe > firmware's responses for the SMCCC interface. This could be used as > the data source for the firmware interface, or be parsed by the OS if > the firmware interface is missing. > > Most errata can be detected from CPU id registers. These mechanisms > are only needed for the rare cases that external knowledge is needed. > > Suggested-by: Andre Przywara <andre.przywara@xxxxxxx> > Signed-off-by: James Morse <james.morse@xxxxxxx> > --- > .../devicetree/bindings/arm/cpus.yaml | 5 ++ > .../firmware/arm,errata-management.yaml | 77 +++++++++++++++++++ > 2 files changed, 82 insertions(+) > create mode 100644 Documentation/devicetree/bindings/firmware/arm,errata-management.yaml > My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check' on your patch (DT_CHECKER_FLAGS is new in v5.13): yamllint warnings/errors: ./Documentation/devicetree/bindings/firmware/arm,errata-management.yaml:48:5: [warning] wrong indentation: expected 6 but found 4 (indentation) ./Documentation/devicetree/bindings/firmware/arm,errata-management.yaml:50:5: [warning] wrong indentation: expected 6 but found 4 (indentation) ./Documentation/devicetree/bindings/firmware/arm,errata-management.yaml:52:5: [warning] wrong indentation: expected 6 but found 4 (indentation) dtschema/dtc warnings/errors: doc reference errors (make refcheckdocs): See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20230330165128.3237939-2-james.morse@xxxxxxx The base for the series is generally the latest rc1. A different dependency should be noted in *this* patch. If you already ran 'make dt_binding_check' and didn't see the above error(s), then make sure 'yamllint' is installed and dt-schema is up to date: pip3 install dtschema --upgrade Please check and re-submit after running the above command yourself. Note that DT_SCHEMA_FILES can be set to your schema file to speed up checking your schema. However, it must be unset to test all examples with your schema.
