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arm64: cpufeature: Detect CPU RAS Extentions

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ARM's v8.2 Extentions add support for Reliability, Availability and
Serviceability (RAS). On CPUs with these extensions system software
can use additional barriers to isolate errors and determine if faults
are pending. Add cpufeature detection.

Platform level RAS support may require additional firmware support.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
[Rebased added config option, reworded commit message]
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Xie XiuQi
2018-01-15 19:38:56 +00:00
committed by Catalin Marinas
parent 7a00d68ebe
commit 64c02720ea
4 changed files with 33 additions and 1 deletions
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16
arch/arm64/Kconfig
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@@ -1062,6 +1062,22 @@ config ARM64_PMEM
operations if DC CVAP is not supported (following the behaviour of
DC CVAP itself if the system does not define a point of persistence).
config ARM64_RAS_EXTN
bool "Enable support for RAS CPU Extensions"
default y
help
CPUs that support the Reliability, Availability and Serviceability
(RAS) Extensions, part of ARMv8.2 are able to track faults and
errors, classify them and report them to software.
On CPUs with these extensions system software can use additional
barriers to determine if faults are pending and read the
classification from a new set of registers.
Selecting this feature will allow the kernel to use these barriers
and access the new registers if the system supports the extension.
Platform RAS features may additionally depend on firmware support.
endmenu
config ARM64_SVE