From: Will Deacon <will@kernel.org>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-kernel@vger.kernel.org, James Morse <james.morse@arm.com>,
Marc Zyngier <maz@kernel.org>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/6] arm64/cpufeature: Introduce ID_PFR2 CPU register
Date: Thu, 9 Apr 2020 13:54:31 +0100 [thread overview]
Message-ID: <20200409125431.GB13078@willie-the-truck> (raw)
In-Reply-To: <1580215149-21492-2-git-send-email-anshuman.khandual@arm.com>
On Tue, Jan 28, 2020 at 06:09:04PM +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.
>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Marc Zyngier <maz@kernel.org>
> Cc: James Morse <james.morse@arm.com>
> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: kvmarm@lists.cs.columbia.edu
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.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 b91570ff9db1..054aab7ebf1b 100644
> --- a/arch/arm64/include/asm/sysreg.h
> +++ b/arch/arm64/include/asm/sysreg.h
> @@ -151,6 +151,7 @@
> #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)
>
> #define SYS_ID_AA64PFR0_EL1 sys_reg(3, 0, 0, 4, 0)
> #define SYS_ID_AA64PFR1_EL1 sys_reg(3, 0, 0, 4, 1)
> @@ -717,6 +718,9 @@
> #define ID_ISAR6_DP_SHIFT 4
> #define ID_ISAR6_JSCVT_SHIFT 0
>
> +#define ID_PFR2_SSBS_SHIFT 4
> +#define ID_PFR2_CSV3_SHIFT 0
> +
> #define MVFR0_FPROUND_SHIFT 28
> #define MVFR0_FPSHVEC_SHIFT 24
> #define MVFR0_FPSQRT_SHIFT 20
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index 0b6715625cf6..c1e837fc8f97 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -348,6 +348,12 @@ static const struct arm64_ftr_bits ftr_id_pfr0[] = {
> ARM64_FTR_END,
> };
>
> +static const struct arm64_ftr_bits ftr_id_pfr2[] = {
> + ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR2_SSBS_SHIFT, 4, 0),
> + ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_PFR2_CSV3_SHIFT, 4, 0),
Why is CSV3 strict here, but not when we see if in aa64pfr0? I think it
should be non-strict in both cases.
Will
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next prev parent reply other threads:[~2020-04-09 12:54 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-28 12:39 [PATCH 0/6] Introduce ID_PFR2 and other CPU feature changes Anshuman Khandual
2020-01-28 12:39 ` [PATCH 1/6] arm64/cpufeature: Introduce ID_PFR2 CPU register Anshuman Khandual
2020-03-20 18:03 ` Suzuki K Poulose
2020-04-09 12:54 ` Will Deacon [this message]
2020-04-13 3:32 ` Anshuman Khandual
2020-01-28 12:39 ` [PATCH 2/6] arm64/cpufeature: Add DIT and CSV2 feature bits in ID_PFR0 register Anshuman Khandual
2020-03-20 18:07 ` Suzuki K Poulose
2020-04-02 2:38 ` Anshuman Khandual
2020-04-09 12:55 ` Will Deacon
2020-04-13 3:35 ` Anshuman Khandual
2020-01-28 12:39 ` [PATCH 3/6] arm64/cpufeature: Add remaining feature bits in ID_MMFR4 register Anshuman Khandual
2020-03-20 18:11 ` Suzuki K Poulose
2020-04-02 2:38 ` Anshuman Khandual
2020-01-28 12:39 ` [PATCH 4/6] arm64/cpufeature: Define an explicit ftr_id_isar0[] for ID_ISAR0 register Anshuman Khandual
2020-03-20 18:16 ` Suzuki K Poulose
2020-01-28 12:39 ` [PATCH 5/6] arm64/cpufeature: Drop TraceFilt feature exposure from ID_DFR0 register Anshuman Khandual
2020-03-20 18:19 ` Suzuki K Poulose
2020-04-02 3:00 ` Anshuman Khandual
2020-04-09 12:53 ` Will Deacon
2020-04-13 3:39 ` Anshuman Khandual
2020-01-28 12:39 ` [PATCH 6/6] arm64/cpufeature: Replace all open bits shift encodings with macros Anshuman Khandual
2020-03-20 18:40 ` Suzuki K Poulose
2020-04-02 2:44 ` Anshuman Khandual
2020-02-14 4:23 ` [PATCH 0/6] Introduce ID_PFR2 and other CPU feature changes Anshuman Khandual
2020-02-14 15:58 ` Peter Maydell
2020-04-02 2:33 ` Anshuman Khandual
2020-03-20 18:49 ` Suzuki K Poulose
2020-04-06 17:09 ` Will Deacon
2020-04-07 8:50 ` Anshuman Khandual
2020-04-09 13:54 ` Will Deacon
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