[PATCH v2 02/12] rvtrace: Initial implementation of driver framework

[Nutty.Liu]

On 11/1/2025 11:42 PM, Anup Patel wrote:
> The RISC-V Trace Control Interface Specification [1] defines a standard
> way of implementing RISC-V trace related modular components irrespective
> to underlying trace format (E-trace or N-trace). These RISC-V trace
> components are organized in a graph-like topology where each RISC-V
> hart has its own RISC-V trace encoder component.
>
> Implement a basic driver framework for RISC-V trace where RISC-V trace
> components are instantiated by a common platform driver and a separate
> RISC-V trace driver for each type of RISC-V trace component.
>
> [1] https://github.com/riscv-non-isa/tg-nexus-trace/releases/download/1.0_Ratified/RISC-V-Trace-Control-Interface.pdf
>
> Co-developed-by: Mayuresh Chitale <mchitale at ventanamicro.com>
> Signed-off-by: Mayuresh Chitale <mchitale at ventanamicro.com>
> Signed-off-by: Anup Patel <apatel at ventanamicro.com>
> ---
>   drivers/Makefile                             |   1 +
>   drivers/hwtracing/Kconfig                    |   2 +
>   drivers/hwtracing/rvtrace/Kconfig            |  16 +
>   drivers/hwtracing/rvtrace/Makefile           |   4 +
>   drivers/hwtracing/rvtrace/rvtrace-core.c     | 501 +++++++++++++++++++
>   drivers/hwtracing/rvtrace/rvtrace-platform.c | 192 +++++++
>   include/linux/rvtrace.h                      | 280 +++++++++++
>   7 files changed, 996 insertions(+)
>   create mode 100644 drivers/hwtracing/rvtrace/Kconfig
>   create mode 100644 drivers/hwtracing/rvtrace/Makefile
>   create mode 100644 drivers/hwtracing/rvtrace/rvtrace-core.c
>   create mode 100644 drivers/hwtracing/rvtrace/rvtrace-platform.c
>   create mode 100644 include/linux/rvtrace.h
Glad to see this series and look forward to supporting 'perf kvm'.

Reviewed-by: Nutty Liu <nutty.liu at hotmail.com>

Thanks,
Nutty