[PATCH 0/2] fix inconsistencies with sysfs configuration in etm

[Yeoreum Yun <yeoreum.yun@arm.com>]

The current ETMx configuration via sysfs can lead to the following
inconsistencies:

  - If a configuration is modified via sysfs while a perf session is
    active, the running configuration may differ between before
    a sched-out and after a subsequent sched-in.

  - Once a perf session is enabled, some read-only register fields
    (e.g., TRCSSCSR<n>) may not be reported correctly,
    because drvdata->config is cleared while enabling with perf mode,
    even though the information was previously read.

To resolve these inconsistencies, the configuration should be separated into:

  - active_config, which represents the currently applied configuration
  - config, which stores the settings configured via sysfs.


This patch based on v7.0-rc4

Yeoreum Yun (2):
  coresight: etm4x: fix inconsistencies with sysfs configration
  coresight: etm3x: fix inconsistencies with sysfs configration

 drivers/hwtracing/coresight/coresight-etm.h   |  2 +
 .../coresight/coresight-etm3x-core.c          | 11 +++--
 .../hwtracing/coresight/coresight-etm4x-cfg.c |  2 +-
 .../coresight/coresight-etm4x-core.c          | 45 +++++++++++--------
 drivers/hwtracing/coresight/coresight-etm4x.h |  2 +
 5 files changed, 39 insertions(+), 23 deletions(-)

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