Re: [PATCH v1 0/3] Add support to configure Coresight Dummy subunit

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Hi Suzuki,

On 3/16/2023 6:55 PM, Suzuki K Poulose wrote:
On 16/03/2023 03:20, Hao Zhang wrote:
Introduction of Coresight Dummy subunit
The Coresight Dummy subunit is for Coresight Dummy component, there are some specific Coresight devices that HLOS don't have permission to access. Such as

What is HLOS ?

The term HLOS stands for High Level OS, it means linux in this case. The HLOS runs on APPS processor.

some TPDMs, they would be configured in NON-HLOS side, but it's necessary to

What is NON-HLOS ?

There are some other sub-processors like modem, adsp etc, they do not have a High Level OS. The OS in these sub-processors is lightweight, less powerful, somewhat real-time, it would be called NON-HLOS.

build Coresight path for it to debug. So there need driver to register dummy
devices as Coresight devices.

Build a path for who to debug ? If this is used by some privileged
software, shouldn't that do all of the work ?

Suzuki

There is coresight source or sink in sub-processor, it would be configured by NON-HLOS, and need HLOS to configure the last coresight components. So we will use dummy source or sink to replace it in HLOS side for building the whole path(from source to sink).

Thanks,
Hao


Commit link:
https://git.codelinaro.org/clo/linux-kernel/coresight/-/tree/coresight-dummy

Hao Zhang (3):
   Coresight: Add coresight dummy driver
   dt-bindings: arm: Add Coresight Dummy Trace YAML schema
   Documentation: trace: Add documentation for Coresight Dummy Trace

  .../bindings/arm/qcom,coresight-dummy.yaml    | 129 +++++++++++++
  .../trace/coresight/coresight-dummy.rst       |  58 ++++++
  drivers/hwtracing/coresight/Kconfig           |  11 ++
  drivers/hwtracing/coresight/Makefile          |   1 +
  drivers/hwtracing/coresight/coresight-dummy.c | 176 ++++++++++++++++++
  5 files changed, 375 insertions(+)
  create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-dummy.yaml
  create mode 100644 Documentation/trace/coresight/coresight-dummy.rst
  create mode 100644 drivers/hwtracing/coresight/coresight-dummy.c





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