kernel/tools/perf/util/cs-etm-decoder, branch linux-5.14.y

perf cs-etm: Prevent and warn on underflows during timestamp calculation.

2021-05-17T14:06:56Z

When a zero timestamp is encountered, warn once. This is to make hardware or configuration issues visible. Also suggest that the issue can be worked around with the --itrace=Z option. When an underflow with a non-zero timestamp occurs, warn every time. This is an unexpected scenario, and with increasing timestamps, it's unlikely that it would occur more than once, therefore it should be ok to warn every time. Only try to calculate the timestamp by subtracting the instruction count if neither of the above cases are true. This makes attempting to decode files with zero timestamps in non-timeless mode more consistent. Currently it can half work if the timestamp wraps around and becomes non-zero, although the behavior is undefined and unpredictable. Signed-off-by: James Clark Reviewed-by: Leo Yan Cc: Al Grant Cc: Alexander Shishkin Cc: Anshuman Khandual Cc: Branislav Rankov Cc: Denis Nikitin Cc: Jiri Olsa Cc: John Garry Cc: Mark Rutland Cc: Mathieu Poirier Cc: Mike Leach Cc: Namhyung Kim Cc: Suzuki Poulouse Cc: Will Deacon Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lore.kernel.org/lkml/20210517131741.3027-4-james.clark@arm.com Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Refactor timestamp variable names

2021-05-12T18:47:04Z

Remove ambiguity in variable names relating to timestamps. A later commit will save the sample kernel timestamp in one of the etm structs, so name all elements appropriately to avoid confusion. This is also removes some ambiguity arising from the fact that the --timestamp argument to perf record refers to sample kernel timestamps, and the /timestamp/ event modifier refers to CS timestamps, so the term is overloaded. Signed-off-by: James Clark Reviewed-by: Mathieu Poirier Cc: Alexander Shishkin Cc: Al Grant Cc: Anshuman Khandual Cc: Branislav Rankov Cc: Denis Nikitin Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Mark Rutland Cc: Mike Leach Cc: Namhyung Kim Cc: Suzuki Poulouse Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Cc: coresight@lists.linaro.org Link: https://lore.kernel.org/r/20210510143248.27423-2-james.clark@arm.com Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Fix various typos in comments

2021-03-23T20:13:43Z

Fix ~124 single-word typos and a few spelling errors in the perf tooling code, accumulated over the years. Signed-off-by: Ingo Molnar Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20210321113734.GA248990@gmail.com Link: http://lore.kernel.org/lkml/20210323160915.GA61903@gmail.com Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Detect pid in VMID for kernel running at EL2

2021-03-02T12:49:35Z

The PID of the task could be traced as VMID when the kernel is running at EL2. Teach the decoder to look for VMID when the CONTEXTIDR (Arm32) or CONTEXTIDR_EL1 (Arm64) is invalid but we have a valid VMID. Signed-off-by: Suzuki K Poulose Co-developed-by: Leo Yan Reviewed-by: Mathieu Poirier Cc: Al Grant Cc: Mike Leach Link: https://lore.kernel.org/r/20210213113220.292229-6-leo.yan@linaro.org Link: https://lore.kernel.org/r/20210224164835.3497311-7-mathieu.poirier@linaro.org Signed-off-by: Leo Yan Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Update ARM's CoreSight hardware tracing OpenCSD library to v1.0.0

2021-01-20T17:34:20Z

Replace the OCSD_INSTR switch statement with an if to fix compilation error about unhandled values and avoid this issue again in the future. Add new OCSD_GEN_TRC_ELEM_SYNC_MARKER and OCSD_GEN_TRC_ELEM_MEMTRANS enum values to fix unhandled value compilation error. Currently they are ignored. Increase the minimum version number to v1.0.0 now that new enum values are used that are only present in this version. Signed-off-by: James Clark Reviewed-by: Mathieu Poirier Reviewed-by: Mike Leach Tested-by: Mike Leach Cc: Alexander Shishkin Cc: Al Grant Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Suzuki K Poulose Cc: Will Deacon Link: https://lore.kernel.org/r/20210108142752.27872-1-james.clark@arm.com Signed-off-by: Arnaldo Carvalho de Melo

perf: cs-etm: Update to build with latest opencsd version.

2020-05-05T19:35:32Z

OpenCSD version v0.14.0 adds in a new output element. This is represented by a new value in the generic element type enum, which must be added to the handling code in perf cs-etm-decoder to prevent build errors due to build options on the perf project. This element is not currently used by the perf decoder. Perf build feature test updated to require a minimum of 0.14.0 Tested on Linux 5.7-rc3. Signed-off-by: Mike Leach Reviewed-by: Leo Yan Reviewed-by: Mathieu Poirier Cc: Peter Zijlstra Cc: Suzuki Poulouse Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lore.kernel.org/lkml/20200501143615.1180-1-mike.leach@linaro.org Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Remove util.h from where it is not needed

2019-09-20T12:19:20Z

Check that it is not needed and remove, fixing up some fallout for places where it was only serving to get something else. Cc: Adrian Hunter Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-9h6dg6lsqe2usyqjh5rrues4@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

tools lib: Adopt zalloc()/zfree() from tools/perf

2019-07-09T13:13:26Z

Eroding a bit more the tools/perf/util/util.h hodpodge header. Cc: Adrian Hunter Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-natazosyn9rwjka25tvcnyi0@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Add notion of time to decoding code

2019-06-10T18:50:02Z

This patch deals with timestamp packets received from the decoding library in order to give the front end packet processing loop a handle on the time instruction conveyed by range packets have been executed at. Signed-off-by: Mathieu Poirier Tested-by: Leo Yan Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Suzuki Poulouse Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20190524173508.29044-17-mathieu.poirier@linaro.org Signed-off-by: Arnaldo Carvalho de Melo

perf cs-etm: Linking PE contextID with perf thread mechanic

2019-06-10T18:50:02Z

Link contextID packets received from the decoder with the perf tool thread mechanic so that we know the specifics of the process currently executing. Signed-off-by: Mathieu Poirier Tested-by: Leo Yan Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Suzuki Poulouse Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20190524173508.29044-16-mathieu.poirier@linaro.org Signed-off-by: Arnaldo Carvalho de Melo