Re: [PATCH V3 04/16] arm64/cpufeature: Introduce ID_PFR2 CPU register

[Will Deacon]

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@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Marc Zyngier <maz@xxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: James Morse <james.morse@xxxxxxx>
> Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
> Cc: kvmarm@xxxxxxxxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> 
> Suggested-by: Mark Rutland <mark.rutland@xxxxxxx>
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
> ---
>  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.

Will