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[v2,0/3] coresight: Add preferred trace id support

Message ID 20240603094354.2348-1-quic_jinlmao@quicinc.com (mailing list archive)
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Series coresight: Add preferred trace id support | expand

Message

Mao Jinlong June 3, 2024, 9:43 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 "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 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 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 | 58 +++++++++++++++++--
 .../hwtracing/coresight/coresight-platform.c  | 26 +++++++++
 drivers/hwtracing/coresight/coresight-stm.c   |  2 +-
 .../hwtracing/coresight/coresight-trace-id.c  | 32 ++++++----
 .../hwtracing/coresight/coresight-trace-id.h  |  5 +-
 include/linux/coresight.h                     |  1 +
 8 files changed, 128 insertions(+), 17 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source