linux-kernel - Re: [PATCH V4 08/17] arm64/cpufeature: Add remaining feature bits in ID

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Date:   Tue, 19 May 2020 11:53:54 +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, maz@...nel.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 08/17] arm64/cpufeature: Add remaining feature bits in
 ID_MMFR4 register

On 05/19/2020 10:40 AM, Anshuman Khandual wrote:
> Enable all remaining feature bits like EVT, CCIDX, LSM, HPDS, CnP, XNX,
> SpecSEI in ID_MMFR4 register per ARM DDI 0487F.a.
> 
> 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: Mark Rutland <mark.rutland@....com>
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
>   arch/arm64/include/asm/sysreg.h |  8 ++++++++
>   arch/arm64/kernel/cpufeature.c  | 13 +++++++++++++
>   2 files changed, 21 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
> index 02b1246e7dbf..0a0cbb3add89 100644
> --- a/arch/arm64/include/asm/sysreg.h
> +++ b/arch/arm64/include/asm/sysreg.h
> @@ -794,6 +794,14 @@
>   #define ID_ISAR6_DP_SHIFT		4
>   #define ID_ISAR6_JSCVT_SHIFT		0
>   
> +#define ID_MMFR4_EVT_SHIFT		28
> +#define ID_MMFR4_CCIDX_SHIFT		24
> +#define ID_MMFR4_LSM_SHIFT		20
> +#define ID_MMFR4_HPDS_SHIFT		16
> +#define ID_MMFR4_CNP_SHIFT		12
> +#define ID_MMFR4_XNX_SHIFT		8
> +#define ID_MMFR4_SPECSEI_SHIFT		0
> +
>   #define ID_MMFR5_ETS_SHIFT		0
>   
>   #define ID_PFR0_DIT_SHIFT		24
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index c929aed9fc4b..92186c40b817 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -392,7 +392,20 @@ static const struct arm64_ftr_bits ftr_id_isar5[] = {
>   };
>   
>   static const struct arm64_ftr_bits ftr_id_mmfr4[] = {
> +	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_EVT_SHIFT, 4, 0),
> +	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_CCIDX_SHIFT, 4, 0),
> +	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_LSM_SHIFT, 4, 0),
> +	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_HPDS_SHIFT, 4, 0),
> +	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_CNP_SHIFT, 4, 0),
> +	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_MMFR4_XNX_SHIFT, 4, 0),
>   	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 4, 4, 0),	/* ac2 */

nit: Please could you add the "ID_MMFR4_AC2_SHIFT", while you are at it ?

Suzuki