linux-kernel - [PATCH V2 0/7] coresight: trbe: Workaround Cortex-A510 erratas

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Date:   Fri,  7 Jan 2022 06:40:01 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki Poulose <suzuki.poulose@....com>,
        coresight@...ts.linaro.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH V2 0/7] coresight: trbe: Workaround Cortex-A510 erratas

	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-rc8.

Relevant errata documents can be found here.

https://developer.arm.com/documentation/SDEN2397239/900
https://developer.arm.com/documentation/SDEN2397589/900

Changes in V2:

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@arm.com/

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

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