linux-kernel - Re: [PATCH V2 2/7] arm64: errata: Add detection for TRBE ignored system register writes

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Message-ID: <267afb26-00c3-63e6-6b8f-6f20785cab82@arm.com>
Date:   Fri, 7 Jan 2022 11:39:08 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        coresight@...ts.linaro.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 2/7] arm64: errata: Add detection for TRBE ignored
 system register writes

On 07/01/2022 01:10, Anshuman Khandual wrote:
> TRBE implementations affected by Arm erratum #2064142 might fail to write
> into certain system registers after the TRBE has been disabled. Under some
> conditions after TRBE has been disabled, writes into certain TRBE registers
> TRBLIMITR_EL1, TRBPTR_EL1, TRBBASER_EL1, TRBSR_EL1 and TRBTRG_EL1 will be
> ignored and not be effected. This adds a new errata ARM64_ERRATUM_2064142
> in arm64 errata framework.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Cc: Suzuki Poulose <suzuki.poulose@....com>
> Cc: coresight@...ts.linaro.org
> Cc: linux-doc@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
>   Documentation/arm64/silicon-errata.rst |  2 ++
>   arch/arm64/Kconfig                     | 18 ++++++++++++++++++
>   arch/arm64/kernel/cpu_errata.c         |  9 +++++++++
>   arch/arm64/tools/cpucaps               |  1 +
>   4 files changed, 30 insertions(+)
> 


Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>