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| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2022-01-25 19:50:34 +0530 |
|---|---|---|
| committer | Mathieu Poirier <mathieu.poirier@linaro.org> | 2022-01-27 12:01:53 -0700 |
| commit | 708e8af4924ec2fdd5b81fe09192c6bac2f86935 (patch) | |
| tree | 67d94b1158ba787bd00437ab4e17747266a6a820 /arch/arm64/Kconfig | |
| parent | 3bd94a8759de9b724b83a80942b0354acd7701eb (diff) | |
| download | lwn-708e8af4924ec2fdd5b81fe09192c6bac2f86935.tar.gz lwn-708e8af4924ec2fdd5b81fe09192c6bac2f86935.zip | |
arm64: errata: Add detection for TRBE trace data corruption
TRBE implementations affected by Arm erratum #1902691 might corrupt trace
data or deadlock, when it's being written into the memory. So effectively
TRBE is broken and hence cannot be used to capture trace data. This adds
a new errata ARM64_ERRATUM_1902691 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
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/1643120437-14352-5-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index fecf2b09e870..9c3cf3875785 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -819,6 +819,24 @@ config ARM64_ERRATUM_2038923 If unsure, say Y. +config ARM64_ERRATUM_1902691 + bool "Cortex-A510: 1902691: workaround TRBE trace corruption" + depends on COMPILE_TEST # Until the CoreSight TRBE driver changes are in + default y + help + This option adds the workaround for ARM Cortex-A510 erratum 1902691. + + Affected Cortex-A510 core might cause trace data corruption, when being written + into the memory. Effectively TRBE is broken and hence cannot be used to capture + trace data. + + Work around this problem in the driver by just preventing TRBE initialization on + affected cpus. The firmware must have disabled the access to TRBE for the kernel + on such implementations. This will cover the kernel for any firmware that doesn't + do this already. + + If unsure, say Y. + config CAVIUM_ERRATUM_22375 bool "Cavium erratum 22375, 24313" default y |