linux-kernel - Re: [PATCH V3 08/16] arm64/cpufeature: Add remaining feature bits in ID

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Date:   Wed, 6 May 2020 12:13:44 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Will Deacon <will@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 08/16] arm64/cpufeature: Add remaining feature bits in
 ID_MMFR4 register



On 05/05/2020 04:44 PM, Will Deacon wrote:
> On Sat, May 02, 2020 at 07:03:57PM +0530, 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 f9e3b9350540..0f34927f52b9 100644
>> --- a/arch/arm64/include/asm/sysreg.h
>> +++ b/arch/arm64/include/asm/sysreg.h
>> @@ -790,6 +790,14 @@
>>  #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
> 
> Why didn't you add ID_MMFR4_AC2_SHIFT as well?

ID_MMFR4_AC2_SHIFT, which will be the replacement for an existing hard
coded bits shift encoding ('4') is being added via [PATCH 16/16] where
we replace all existing open encodings.