linux-kernel - Re: [PATCH 2/6] arm64/cpufeature: Add DIT and CSV2 feature bits in ID

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Message-ID: <fc6a3044-4ca7-8a37-d948-498d0d89a426@arm.com>
Date:   Fri, 20 Mar 2020 18:07:01 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     anshuman.khandual@....com, linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will@...nel.org,
        linux-kernel@...r.kernel.org, mark.rutland@....com
Subject: Re: [PATCH 2/6] arm64/cpufeature: Add DIT and CSV2 feature bits in
 ID_PFR0 register

Cc: Mark Rutland

On 01/28/2020 12:39 PM, Anshuman Khandual wrote:
> Enable DIT and CSV2 feature bits in ID_PFR0 register as per ARM DDI 0487E.a
> specification. Except RAS and AMU, all other feature bits are now enabled.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

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

> ---
>   arch/arm64/include/asm/sysreg.h | 3 +++
>   arch/arm64/kernel/cpufeature.c  | 2 ++
>   2 files changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
> index 054aab7ebf1b..469d61c8fabf 100644
> --- a/arch/arm64/include/asm/sysreg.h
> +++ b/arch/arm64/include/asm/sysreg.h
> @@ -718,6 +718,9 @@
>   #define ID_ISAR6_DP_SHIFT		4
>   #define ID_ISAR6_JSCVT_SHIFT		0
>   
> +#define ID_PFR0_DIT_SHIFT		24
> +#define ID_PFR0_CSV2_SHIFT		16
> +
>   #define ID_PFR2_SSBS_SHIFT		4
>   #define ID_PFR2_CSV3_SHIFT		0
>   
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index c1e837fc8f97..9e4dab15c608 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -341,6 +341,8 @@ static const struct arm64_ftr_bits ftr_id_isar6[] = {
>   };
>   
>   static const struct arm64_ftr_bits ftr_id_pfr0[] = {
> +	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_DIT_SHIFT, 4, 0),
> +	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR0_CSV2_SHIFT, 4, 0),
>   	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 12, 4, 0),		/* State3 */
>   	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 8, 4, 0),		/* State2 */
>   	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0),		/* State1 */
>