[RFC PATCH 00/12] Add Linux RISC-V trace support via CoreSight

[Zane Leung]

Hi, all
I plan to extracting CoreSight's architecture-independent framework code
into a shared layer (drivers/hwtracing/trace-common/) to support multiple
trace implementations (ARM CoreSight, RISC-V trace, etc.).

  ## Proposed Structure

  drivers/hwtracing/
  ├── trace-common/          # New: Generic framework layer
  │   ├── trace-core.c       # Device reg, path building/enable/disable
  │   ├── trace-core.h       # Public interfaces
  │   └── Makefile/Kconfig (CONFIG_TRACE_FRAMEWORK)
  │
  ├── coresight/             # Modified: ARM-specific only
  │   ├── coresight-core.c   # ARM CTI, claim/disclaim, module init
  │   ├── Makefile/Kconfig   # select TRACE_FRAMEWORK
  │   └── [existing ARM drivers]
  │
  └── rvtrace/               # New: RISC-V trace
      ├── [RISC-V components]
      └── Makefile/Kconfig   # select TRACE_FRAMEWORK

Is this architectural direction acceptable? Any comments or suggestions are welcome.