[PATCH v2 0/7] perf: cs-etm: Coresight decode and disassembly improvements

[James Clark <james.clark@linaro.org>]

A set of changes that came out of the issues reported here [1].

 * First 2 patches fix a decode bug in Perf and add support for new
   consistency checks in OpenCSD
 * The remaining ones make the disassembly script easier to test
   and use. This also involves adding a new Python binding to
   Perf to get a config value (perf_config_get())

[1]: https://lore.kernel.org/linux-arm-kernel/20240719092619.274730-1-gankulkarni@os.amperecomputing.com/

Changes since V1:
  * Keep the flush function for discontinuities
  * Still remove the flush when the buffer fills, but now add
    cs_etm__end_block() for the end trace. That way we won't drop
    the last branch stack if the instruction sample period wasn't
    hit at the very end.

James Clark (7):
  perf cs-etm: Don't flush when packet_queue fills up
  perf cs-etm: Use new OpenCSD consistency checks
  perf scripting python: Add function to get a config value
  perf scripts python cs-etm: Update to use argparse
  perf scripts python cs-etm: Improve arguments
  perf scripts python cs-etm: Add start and stop arguments
  perf test: cs-etm: Test Coresight disassembly script

 .../perf/Documentation/perf-script-python.txt |   2 +-
 .../scripts/python/Perf-Trace-Util/Context.c  |  11 ++
 .../scripts/python/arm-cs-trace-disasm.py     | 109 +++++++++++++-----
 .../tests/shell/test_arm_coresight_disasm.sh  |  63 ++++++++++
 tools/perf/util/config.c                      |  22 ++++
 tools/perf/util/config.h                      |   1 +
 .../perf/util/cs-etm-decoder/cs-etm-decoder.c |   7 +-
 tools/perf/util/cs-etm.c                      |  25 ++--
 8 files changed, 205 insertions(+), 35 deletions(-)
 create mode 100755 tools/perf/tests/shell/test_arm_coresight_disasm.sh

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2.34.1