This series adds three different workarounds in the TRBE driver for Cortex-A510 specific erratas. But first, this adds Cortex-A510 specific cpu part number definition in the platform. This series applies on 5.16. Relevant errata documents can be found here. https://developer.arm.com/documentation/SDEN2397239/900 https://developer.arm.com/documentation/SDEN2397589/900 Changes in V3: - Moved the comment inside trbe_needs_drain_after_disable() - Moved the comment inside trbe_needs_ctxt_sync_after_enable() Changes in V2: https://lore.kernel.org/all/1641517808-5735-1-git-send-email-anshuman.khandual@xxxxxxx/ Accommodated most review comments from the previous version. - Split all patches into CPU errata definition, detection and TRBE workarounds - s/TRBE_WORKAROUND_SYSREG_WRITE_FAILURE/TRBE_NEEDS_DRAIN_AFTER_DISABLE - s/TRBE_WORKAROUND_CORRUPTION_WITH_ENABLE/TRBE_NEEDS_CTXT_SYNC_AFTER_ENABLE - s/trbe_may_fail_sysreg_write()/trbe_needs_drain_after_disable() - s/trbe_may_corrupt_with_enable()/trbe_needs_ctxt_sync_after_enable() - Updated Kconfig help message for config ARM64_ERRATUM_1902691 - Updated error message for trbe_is_broken() detection - Added new trblimitr parameter to set_trbe_enabled(), improving performance - Added COMPILE_TEST dependency in the errata, until TRBE part is available Changes in V1: https://lore.kernel.org/lkml/1641359159-22726-1-git-send-email-anshuman.khandual@xxxxxxx/ Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx> Cc: Suzuki Poulose <suzuki.poulose@xxxxxxx> Cc: coresight@xxxxxxxxxxxxxxxx Cc: linux-doc@xxxxxxxxxxxxxxx Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Anshuman Khandual (7): arm64: Add Cortex-A510 CPU part definition arm64: errata: Add detection for TRBE ignored system register writes arm64: errata: Add detection for TRBE invalid prohibited states arm64: errata: Add detection for TRBE trace data corruption coresight: trbe: Work around the ignored system register writes coresight: trbe: Work around the invalid prohibited states coresight: trbe: Work around the trace data corruption Documentation/arm64/silicon-errata.rst | 6 + arch/arm64/Kconfig | 59 ++++++++++ arch/arm64/include/asm/cputype.h | 2 + arch/arm64/kernel/cpu_errata.c | 27 +++++ arch/arm64/tools/cpucaps | 3 + drivers/hwtracing/coresight/coresight-trbe.c | 114 ++++++++++++++----- drivers/hwtracing/coresight/coresight-trbe.h | 8 -- 7 files changed, 183 insertions(+), 36 deletions(-) -- 2.25.1
