linux-kernel - Re: [PATCH V3 04/16] arm64/cpufeature: Introduce ID

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Message-ID: <918e2dfb-4b3b-c1e6-3151-c81ac9f416b6@arm.com>
Date:   Fri, 8 May 2020 14:02:35 +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>,
        Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 04/16] arm64/cpufeature: Introduce ID_PFR2 CPU register



On 05/05/2020 04:42 PM, Will Deacon wrote:
> On Sat, May 02, 2020 at 07:03:53PM +0530, Anshuman Khandual wrote:
>> This adds basic building blocks required for ID_PFR2 CPU register which
>> provides information about the AArch32 programmers model which must be
>> interpreted along with ID_PFR0 and ID_PFR1 CPU registers. This is added
>> per ARM DDI 0487F.a specification.
>>
>> Cc: Catalin Marinas <catalin.marinas@....com>
>> Cc: Will Deacon <will@...nel.org>
>> Cc: Marc Zyngier <maz@...nel.org>
>> Cc: Mark Rutland <mark.rutland@....com>
>> Cc: James Morse <james.morse@....com>
>> Cc: Suzuki K Poulose <suzuki.poulose@....com>
>> Cc: kvmarm@...ts.cs.columbia.edu
>> 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/cpu.h    |  1 +
>>  arch/arm64/include/asm/sysreg.h |  4 ++++
>>  arch/arm64/kernel/cpufeature.c  | 11 +++++++++++
>>  arch/arm64/kernel/cpuinfo.c     |  1 +
>>  arch/arm64/kvm/sys_regs.c       |  2 +-
>>  5 files changed, 18 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h
>> index b4a40535a3d8..464e828a994d 100644
>> --- a/arch/arm64/include/asm/cpu.h
>> +++ b/arch/arm64/include/asm/cpu.h
>> @@ -46,6 +46,7 @@ struct cpuinfo_arm64 {
>>  	u32		reg_id_mmfr3;
>>  	u32		reg_id_pfr0;
>>  	u32		reg_id_pfr1;
>> +	u32		reg_id_pfr2;
>>  
>>  	u32		reg_mvfr0;
>>  	u32		reg_mvfr1;
>> diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
>> index e5317a6367b6..c977449e02db 100644
>> --- a/arch/arm64/include/asm/sysreg.h
>> +++ b/arch/arm64/include/asm/sysreg.h
>> @@ -153,6 +153,7 @@
>>  #define SYS_MVFR0_EL1			sys_reg(3, 0, 0, 3, 0)
>>  #define SYS_MVFR1_EL1			sys_reg(3, 0, 0, 3, 1)
>>  #define SYS_MVFR2_EL1			sys_reg(3, 0, 0, 3, 2)
>> +#define SYS_ID_PFR2_EL1			sys_reg(3, 0, 0, 3, 4)
> 
> nit: but please group these defines by name rather than encoding.

Sure, will do the same for all new register being added in the series.