This is the second revision of a patchset that adds support for CPU-wide trace scenarios and as such, it is now possible to issue the following commands:
# perf record -e cs_etm/@20070000.etr/ -C 2,3 $COMMAND # perf record -e cs_etm/@20070000.etr/ -a $COMMAND
The solution is designed to work for both 1:1 and N:1 source/sink topologies, though the former hasn't been tested for lack of access to HW.
Most of the changes revolve around allowing more than one event to use a sink when operated from perf. More specifically the first event to use a sink switches it on while the last one is tasked to aggregate traces and switching off the device.
This is the kernel part of the solution, with the user space portion to be released in a later set. All patches (user and kernel) have been rebased on v5.1-rc2 and are hosted here[1]. Everything has been tested on Juno and 410c dragonboard platforms.
Regards, Mathieu
[1]. https://git.linaro.org/people/mathieu.poirier/coresight.git (5.1-rc2-cpu-wide-v2)
== Changes for V2 == * Using define ETM4_CFG_BIT_CTXTID rather than hard coded value (Suzuki). * Moved pid out of struct etr_buf and into struct etr_perf_buffer (Suzuki). * Removed code related to forcing double buffering (Suzuki). * Fixed function reallocarray() for older distributions (Mike). * Fixed counter configuration when dealing with errors(Leo). * Automatically selecting PID_IN_CONTEXTIDR with ETMv4 driver. * Rebased to v5.1-rc2.
Mathieu Poirier (16): coresight: pmu: Adding ITRACE property to cs_etm PMU coresight: etm4x: Add kernel configuration for CONTEXTID coresight: etm4x: Configure tracers to emit timestamps coresight: Adding return code to sink::disable() operation coresight: Move reference counting inside sink drivers coresight: Properly address errors in sink::disable() functions coresight: Properly address concurrency in sink::update() functions coresight: perf: Clean up function etm_setup_aux() coresight: perf: Refactor function free_event_data() coresight: Communicate perf event to sink buffer allocation function coresight: tmc-etr: Refactor function tmc_etr_setup_perf_buf() coresight: tmc-etr: Introduce the notion of process ID to ETR devices coresight: tmc-etr: Allow events to use the same ETR buffer coresight: tmc-etr: Add support for CPU-wide trace scenarios coresight: tmc-etf: Add support for CPU-wide trace scenarios coresight: etb10: Add support for CPU-wide trace scenarios
drivers/hwtracing/coresight/Kconfig | 1 + drivers/hwtracing/coresight/coresight-etb10.c | 83 +++++-- .../hwtracing/coresight/coresight-etm-perf.c | 37 +++- drivers/hwtracing/coresight/coresight-etm4x.c | 120 ++++++++++- .../hwtracing/coresight/coresight-tmc-etf.c | 82 +++++-- .../hwtracing/coresight/coresight-tmc-etr.c | 204 +++++++++++++++--- drivers/hwtracing/coresight/coresight-tmc.c | 2 + drivers/hwtracing/coresight/coresight-tmc.h | 6 + drivers/hwtracing/coresight/coresight-tpiu.c | 9 +- drivers/hwtracing/coresight/coresight.c | 28 +-- include/linux/coresight-pmu.h | 2 + include/linux/coresight.h | 7 +- tools/include/linux/coresight-pmu.h | 2 + 13 files changed, 482 insertions(+), 101 deletions(-)