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| author | Joey Gouly <joey.gouly@arm.com> | 2024-08-22 16:10:48 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2024-09-04 12:48:52 +0100 |
| commit | 3496f69391eee225244f0d3f0404142a80b710f5 (patch) | |
| tree | 074c5b074e074a8f639c06a2e94559e311bffe4a /arch/arm64/kernel | |
| parent | 878c05e8ef846bd1e402ba662d12e575a073e070 (diff) | |
| download | lwn-3496f69391eee225244f0d3f0404142a80b710f5.tar.gz lwn-3496f69391eee225244f0d3f0404142a80b710f5.zip | |
arm64: cpufeature: add Permission Overlay Extension cpucap
This indicates if the system supports POE. This is a CPUCAP_BOOT_CPU_FEATURE
as the boot CPU will enable POE if it has it, so secondary CPUs must also
have this feature.
Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20240822151113.1479789-6-joey.gouly@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 646ecd3069fd..2daf5597cd65 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2870,6 +2870,15 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .matches = has_nv1, ARM64_CPUID_FIELDS_NEG(ID_AA64MMFR4_EL1, E2H0, NI_NV1) }, +#ifdef CONFIG_ARM64_POE + { + .desc = "Stage-1 Permission Overlay Extension (S1POE)", + .capability = ARM64_HAS_S1POE, + .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, + .matches = has_cpuid_feature, + ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, S1POE, IMP) + }, +#endif {}, }; |