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

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Date:   Tue, 5 May 2020 12:16:07 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Will Deacon <will@...nel.org>
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        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 Tue, May 05, 2020 at 12:12:41PM +0100, 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.

So far we've *always* grouped these by encoding in this file, so can we
keep things that way for now? Otherwise we're inconsistent with both
schemes.

Mark.