[v1,0/2] coresight: Add remote etm support

Message

Mao Jinlong Nov. 7, 2023, 6:09 a.m. UTC

The system on chip (SoC) consists of main APSS(Applications processor
subsytem) and additional processors like modem, lpass. There is
coresight-etm driver for etm trace of APSS. Coresight remote etm driver
is for enabling and disabling the etm trace of remote processors.
It uses QMI interface to communicate with remote processors' software
and uses coresight framework to configure the connection from remote
etm source to TMC sinks.

Example to capture the remote etm trace:

Enable source:
echo 1 > /sys/bus/coresight/devices/tmc_etf0/enable_sink
echo 1 > /sys/bus/coresight/devices/remote_etm0/enable_source

Capture the trace:
cat /dev/tmc_etf0 > /data/remote_etm.bin

Disable source:
echo 0 > /sys/bus/coresight/devices/remote_etm0/enable_source

Mao Jinlong (2):
  coresight: Add remote etm support
  dt-bindings: arm: Add remote etm driver

 .../arm/qcom,coresight-remote-etm.yaml        |  59 ++++
 drivers/hwtracing/coresight/Kconfig           |   9 +
 drivers/hwtracing/coresight/Makefile          |   1 +
 drivers/hwtracing/coresight/coresight-core.c  |   3 +
 drivers/hwtracing/coresight/coresight-qmi.h   | 109 ++++++
 .../coresight/coresight-remote-etm.c          | 325 ++++++++++++++++++
 include/linux/coresight.h                     |   1 +
 7 files changed, 507 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-remote-etm.yaml
 create mode 100644 drivers/hwtracing/coresight/coresight-qmi.h
 create mode 100644 drivers/hwtracing/coresight/coresight-remote-etm.c