linux-kernel - Re: [PATCH V5 1/4] arm64/cpufeature: Add remaining feature bits in ID

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Date:   Thu, 2 Jul 2020 12:22:42 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     anshuman.khandual@....com, linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will@...nel.org, mark.rutland@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 1/4] arm64/cpufeature: Add remaining feature bits in
 ID_AA64MMFR0 register

On 05/27/2020 04:03 AM, Anshuman Khandual wrote:
> Enable EVC, FGT, EXS features bits in ID_AA64MMFR0 register as per ARM DDI
> 0487F.a specification.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Suggested-by: Will Deacon <will@...nel.org>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
>   arch/arm64/include/asm/sysreg.h | 3 +++
>   arch/arm64/kernel/cpufeature.c  | 3 +++
>   2 files changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
> index fa9d02ca4b25..cf983d03aa4c 100644
> --- a/arch/arm64/include/asm/sysreg.h
> +++ b/arch/arm64/include/asm/sysreg.h
> @@ -703,6 +703,9 @@
>   #define ID_AA64ZFR0_SVEVER_SVE2		0x1
>   
>   /* id_aa64mmfr0 */
> +#define ID_AA64MMFR0_ECV_SHIFT		60
> +#define ID_AA64MMFR0_FGT_SHIFT		56
> +#define ID_AA64MMFR0_EXS_SHIFT		44
>   #define ID_AA64MMFR0_TGRAN4_SHIFT	28
>   #define ID_AA64MMFR0_TGRAN64_SHIFT	24
>   #define ID_AA64MMFR0_TGRAN16_SHIFT	20
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index ada9f6f9b0f6..feaa6dcd6f7b 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -267,6 +267,9 @@ static const struct arm64_ftr_bits ftr_id_aa64zfr0[] = {
>   };
>   
>   static const struct arm64_ftr_bits ftr_id_aa64mmfr0[] = {
> +	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_ECV_SHIFT, 4, 0),
> +	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_FGT_SHIFT, 4, 0),
> +	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR0_EXS_SHIFT, 4, 0),

Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>