linux-kernel - [PATCH v6 00/15] arm64: Self-hosted trace related errata workarounds

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Message-Id: <20211019163153.3692640-1-suzuki.poulose@arm.com>
Date:   Tue, 19 Oct 2021 17:31:38 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     will@...nel.org, mathieu.poirier@...aro.org
Cc:     catalin.marinas@....com, anshuman.khandual@....com,
        mike.leach@...aro.org, leo.yan@...aro.org, maz@...nel.org,
        coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v6 00/15] 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 coresight/next. The series has been reordered
to make it easier to merge the patches via arm64 tree and the coresight
tree.

Patches 1-4 are could be picked up via arm64 tree. The rest can go via
the coresight tree. The Kconfig items for the TRBE errata are initially
dropped in with dependency on COMPILE_TEST. These are dropped only after
the driver is equipped with the work around in later patches.


A tree is available here :

git@....gitlab.arm.com:linux-arm/linux-skp.git  coresight/errata/trbe-tsb-n2-a710/v6

Changes since v5:
 * https://lkml.kernel.org/r/20211014223125.2605031-1-suzuki.poulose@arm.com
 - Fix typo in the Kconfig symbol usage in errata listing (Will)
 - Fix typo in commit description for 
   "arm64: errata: Add detection for TRBE overwrite in FILL mode"
 - Fix commit description checkpatch warnings on column length for:
    "arm64: errata: Add detection for TRBE write to out-of-range"
 - Collected Reviews/Acks from Mathieu/Anshuman/Will

Changes since v4:
 * https://lkml.kernel.org/r/20211012131743.2040596-1-suzuki.poulose@arm.com

 - Fix WARN on trbe driver probe on a hotplugged CPU, by making
   sure that the arm_trbe_probe_cpu() is called from non-premptible
   context. this_cpu_has_cap() doesn't like to be called from a
   preemptible() context.

 - Fix Kconfig text issues pointed out by Randy

Changes since v3:
 
 - Fix missing Kconfig selection for TSB flush failure erratum (Will)
   Merged the Kconfig changes to the core patch for TSB.
 - Use COMPILE_TEST dependency for the TRBE work arounds instead of
   delaying the Kconfig entries.

Changes since v2:
 * https://lkml.kernel.org/r/20210921134121.2423546-1-suzuki.poulose@arm.com 
 - Dropped patch adding a helper to reach cpudata from perf handle
 - Split the TSB erratum work around patch to split the Kconfig/erratum
   list update changes(pushed to the end of the series).
 - Added wrappers to check the erratum :
    trbe_has_erratum(cpudata, TRBE_ERRATUM_<TITLE>) -> trbe_may_<title>
 - More ASCII art explanation on workaround.

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 (15):
  arm64: Add Neoverse-N2, Cortex-A710 CPU part definition
  arm64: errata: Add detection for TRBE overwrite in FILL mode
  arm64: errata: Add workaround for TSB flush failures
  arm64: errata: Add detection for TRBE write to out-of-range
  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
  coresight: trbe: Add infrastructure for Errata handling
  coresight: trbe: Workaround TRBE errata overwrite in FILL mode
  coresight: trbe: Add a helper to determine the minimum buffer size
  coresight: trbe: Make sure we have enough space
  coresight: trbe: Work around write to out of range
  arm64: errata: Enable workaround for TRBE overwrite in FILL mode
  arm64: errata: Enable TRBE workaround for write to out-of-range
    address

 Documentation/arm64/silicon-errata.rst       |  12 +
 arch/arm64/Kconfig                           | 111 ++++++
 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 | 394 +++++++++++++++++--
 7 files changed, 567 insertions(+), 37 deletions(-)

-- 
2.25.4