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SubjectRe: [PATCH v3 1/6] arm64: Detect the ARMv8.4 TTL feature
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Hello Zhenyu,

On 05/25/2020 06:22 PM, Zhenyu Ye wrote:
> diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
> index c4ac0ac25a00..477d84ba1056 100644
> --- a/arch/arm64/include/asm/sysreg.h
> +++ b/arch/arm64/include/asm/sysreg.h
> @@ -725,6 +725,7 @@
>
> /* id_aa64mmfr2 */
> #define ID_AA64MMFR2_E0PD_SHIFT 60
> +#define ID_AA64MMFR2_TTL_SHIFT 48
> #define ID_AA64MMFR2_FWB_SHIFT 40
> #define ID_AA64MMFR2_AT_SHIFT 32
> #define ID_AA64MMFR2_LVA_SHIFT 16
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index 9fac745aa7bb..d993dc6dc7d5 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -244,6 +244,7 @@ static const struct arm64_ftr_bits ftr_id_aa64mmfr1[] = {
>
> static const struct arm64_ftr_bits ftr_id_aa64mmfr2[] = {
> ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_E0PD_SHIFT, 4, 0),
> + ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_TTL_SHIFT, 4, 0),
> ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_FWB_SHIFT, 4, 0),
> ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_AT_SHIFT, 4, 0),
> ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_LVA_SHIFT, 4, 0),
> @@ -1622,6 +1623,16 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
> .matches = has_cpuid_feature,
> .cpu_enable = cpu_has_fwb,
> },

This patch (https://patchwork.kernel.org/patch/11557359/) is adding some
more ID_AA64MMFR2 features including the TTL. I am going to respin parts
of the V4 series patches along with the above mentioned patch. So please
rebase this series accordingly, probably on latest next.

- Anshuman

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