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Date:   Fri, 7 Jan 2022 10:59:09 +0000
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Anshuman Khandual <anshuman.khandual@arm.com>
Cc:     linux-arm-kernel@lists.infradead.org,
        Will Deacon <will@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Suzuki Poulose <suzuki.poulose@arm.com>,
        coresight@lists.linaro.org, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH V2 3/7] arm64: errata: Add detection for TRBE invalid
 prohibited states
Message-ID: <Ydgc/dlEkQN/JBXx@arm.com>
References: <1641517808-5735-1-git-send-email-anshuman.khandual@arm.com>
 <1641517808-5735-4-git-send-email-anshuman.khandual@arm.com>
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On Fri, Jan 07, 2022 at 06:40:04AM +0530, Anshuman Khandual wrote:
> TRBE implementations affected by Arm erratum #2038923 might get TRBE into
> an inconsistent view on whether trace is prohibited within the CPU. As a
> result, the trace buffer or trace buffer state might be corrupted. This
> happens after TRBE buffer has been enabled by setting TRBLIMITR_EL1.E,
> followed by just a single context synchronization event before execution
> changes from a context, in which trace is prohibited to one where it isn't,
> or vice versa. In these mentioned conditions, the view of whether trace is
> prohibited is inconsistent between parts of the CPU, and the trace buffer
> or the trace buffer state might be corrupted. This adds a new errata
> ARM64_ERRATUM_2038923 in arm64 errata framework.
> 
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Suzuki Poulose <suzuki.poulose@arm.com>
> Cc: coresight@lists.linaro.org
> Cc: linux-doc@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>