linux-kernel - [PATCH v2 00/17] arm64: Self-hosted trace related errata workarounds

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Message-Id: <20210921134121.2423546-1-suzuki.poulose@arm.com>
Date:   Tue, 21 Sep 2021 14:41:04 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, maz@...nel.org,
        catalin.marinas@....com, mark.rutland@....com, james.morse@....com,
        anshuman.khandual@....com, leo.yan@...aro.org,
        mike.leach@...aro.org, mathieu.poirier@...aro.org, will@...nel.org,
        lcherian@...vell.com, coresight@...ts.linaro.org,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v2 00/17] arm64: Self-hosted trace related errata workarounds

This series adds CPU erratum work arounds related to the self-hosted
tracing. The list of affected errata handled in this series are :

 * TRBE may overwrite trace in FILL mode
   - Arm Neoverse-N2	#2139208
   - Cortex-A710	#211985

 * A TSB instruction may not flush the trace completely when executed
   in trace prohibited region.

   - Arm Neoverse-N2	#2067961
   - Cortex-A710	#2054223

 * TRBE may write to out-of-range address
   - Arm Neoverse-N2	#2253138
   - Cortex-A710	#2224489

The series applies on the self-hosted/trbe fixes posted here [0].
A tree containing both the series is available here [1]

 [0] https://lkml.kernel.org/r/20210914102641.1852544-1-suzuki.poulose@arm.com
 [1] git@....gitlab.arm.com:linux-arm/linux-skp.git coresight/errata/trbe-tsb-n2-a710/v2

Changes since v1:
 https://lkml.kernel.org/r/20210728135217.591173-1-suzuki.poulose@arm.com
 - Added a fix to the TRBE driver handling of sink_specific data
 - Added more description and ASCII art for overwrite in FILL mode
   work around 
 - Added another TRBE erratum to the list.
  "TRBE may write to out-of-range address"
  Patches from 12-17
 - Added comment to list the expectations around TSB erratum workaround.


Suzuki K Poulose (17):
  coresight: trbe: Fix incorrect access of the sink specific data
  coresight: trbe: Add infrastructure for Errata handling
  coresight: trbe: Add a helper to calculate the trace generated
  coresight: trbe: Add a helper to pad a given buffer area
  coresight: trbe: Decouple buffer base from the hardware base
  coresight: trbe: Allow driver to choose a different alignment
  arm64: Add Neoverse-N2, Cortex-A710 CPU part definition
  arm64: Add erratum detection for TRBE overwrite in FILL mode
  coresight: trbe: Workaround TRBE errata overwrite in FILL mode
  arm64: Enable workaround for TRBE overwrite in FILL mode
  arm64: errata: Add workaround for TSB flush failures
  coresight: trbe: Add a helper to fetch cpudata from perf handle
  coresight: trbe: Add a helper to determine the minimum buffer size
  coresight: trbe: Make sure we have enough space
  arm64: Add erratum detection for TRBE write to out-of-range
  coresight: trbe: Work around write to out of range
  arm64: Advertise TRBE erratum workaround for write to out-of-range address

 Documentation/arm64/silicon-errata.rst       |  12 +
 arch/arm64/Kconfig                           | 109 ++++++
 arch/arm64/include/asm/barrier.h             |  16 +-
 arch/arm64/include/asm/cputype.h             |   4 +
 arch/arm64/kernel/cpu_errata.c               |  64 ++++
 arch/arm64/tools/cpucaps                     |   3 +
 drivers/hwtracing/coresight/coresight-trbe.c | 339 +++++++++++++++++--
 7 files changed, 510 insertions(+), 37 deletions(-)

-- 
2.24.1