linux-kernel - [PATCH v3 0/7] perf: cs-etm: Coresight decode and disassembly improvements

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Message-Id: <20240916135743.1490403-1-james.clark@linaro.org>
Date: Mon, 16 Sep 2024 14:57:31 +0100
From: James Clark <james.clark@...aro.org>
To: linux-perf-users@...r.kernel.org,
	gankulkarni@...amperecomputing.com,
	coresight@...ts.linaro.org,
	leo.yan@....com,
	scclevenger@...amperecomputing.com
Cc: James Clark <james.clark@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Mike Leach <mike.leach@...aro.org>,
	John Garry <john.g.garry@...cle.com>,
	Will Deacon <will@...nel.org>,
	Leo Yan <leo.yan@...ux.dev>,
	Ben Gainey <ben.gainey@....com>,
	Ruidong Tian <tianruidong@...ux.alibaba.com>,
	Benjamin Gray <bgray@...ux.ibm.com>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 0/7] perf: cs-etm: Coresight decode and disassembly improvements

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 V2:
  * Check validity of start stop arguments
  * Make test work if Perf was installed
  * Document that start and stop time are monotonic clock values

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     | 127 ++++++++++++++----
 .../tests/shell/test_arm_coresight_disasm.sh  |  65 +++++++++
 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, 225 insertions(+), 35 deletions(-)
 create mode 100755 tools/perf/tests/shell/test_arm_coresight_disasm.sh

-- 
2.34.1