mbox series

[v3,0/3] coresight: Add preferred trace id support

Message ID 20240626060724.28862-1-quic_jinlmao@quicinc.com (mailing list archive)
Headers show
Series coresight: Add preferred trace id support | expand

Message

Mao Jinlong June 26, 2024, 6:07 a.m. UTC 
Some HW has static trace id which cannot be changed via
software programming. For this case, configure the trace id
in device tree with "arm,trace-id = <xxx>", and
call coresight_trace_id_get_system_id with the trace id value
in device probe function. The id will be reserved for the HW
all the time if the device is probed.

Changes since V2:
1. Change "trace-id" to "arm,trace-id".
2. Add trace id flag for getting preferred id or ODD id.

Changes since V1:
1. Add argument to coresight_trace_id_get_system_id for preferred id
instead of adding new function coresight_trace_id_reserve_system_id.
2. Add constraint to trace-id in dt-binding file.

Mao Jinlong (3):
  dt-bindings: arm: Add arm,trace-id for coresight dummy source
  coresight: Add support to get preferred id for system trace sources
  coresight: dummy: Add reserve atid support for dummy source

 .../sysfs-bus-coresight-devices-dummy-source  | 15 +++++
 .../arm/arm,coresight-dummy-source.yaml       |  6 ++
 drivers/hwtracing/coresight/coresight-dummy.c | 59 +++++++++++++++++--
 .../hwtracing/coresight/coresight-platform.c  | 25 ++++++++
 drivers/hwtracing/coresight/coresight-stm.c   |  2 +-
 drivers/hwtracing/coresight/coresight-tpda.c  |  2 +-
 .../hwtracing/coresight/coresight-trace-id.c  | 35 +++++++----
 .../hwtracing/coresight/coresight-trace-id.h  | 11 +++-
 include/linux/coresight.h                     |  1 +
 9 files changed, 137 insertions(+), 19 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source