[PATCH V2 3/7] arm64: errata: Add detection for TRBE invalid prohibited states

[Catalin Marinas]

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 at arm.com>
> Cc: Will Deacon <will at kernel.org>
> Cc: Mathieu Poirier <mathieu.poirier at linaro.org>
> Cc: Suzuki Poulose <suzuki.poulose at arm.com>
> Cc: coresight at lists.linaro.org
> Cc: linux-doc at vger.kernel.org
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: linux-kernel at vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual at arm.com>

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