linux-kernel - Re: [PATCH v3 1/6] arm64: Detect the ARMv8.4 TTL feature

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Date:   Tue, 26 May 2020 08:09:03 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Zhenyu Ye <yezhenyu2@...wei.com>, catalin.marinas@....com,
        peterz@...radead.org, mark.rutland@....com, will@...nel.org,
        aneesh.kumar@...ux.ibm.com, akpm@...ux-foundation.org,
        npiggin@...il.com, arnd@...db.de, rostedt@...dmis.org,
        maz@...nel.org, suzuki.poulose@....com, tglx@...utronix.de,
        yuzhao@...gle.com, Dave.Martin@....com, steven.price@....com,
        broonie@...nel.org, guohanjun@...wei.com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org, arm@...nel.org,
        xiexiangyou@...wei.com, prime.zeng@...ilicon.com,
        zhangshaokun@...ilicon.com, kuhn.chenqun@...wei.com
Subject: Re: [PATCH v3 1/6] arm64: Detect the ARMv8.4 TTL feature

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