Re: [PATCH 2] Register read and writes tracing

[Florian Fainelli]

On 11/5/2020 6:56 PM, Prasad Sodagudi wrote:
> This patch series adds register read/write event tracing
> support. Qualcomm team tried upstreaming the register
> trace buffer solution - [1] with pstore and dynamic debug
> feature but that patch series didn't merge. I have followed
> Steve suggestion from -[2] and used tracepoint_enabled() API.
> 
> [1] - https://patchwork.kernel.org/project/linux-arm-msm/cover/cover.1536430404.git.saiprakash.ranjan@xxxxxxxxxxxxxx/
> [2] - https://lore.kernel.org/lkml/20200928105501.7e29df65@xxxxxxxxxxxxxxxx/ 
> 
> Qualcomm teams uses these logs for debugging various issues
> in the product life cycle and hopping that this logging
> would help other silicon vendors as this is generic approach.

There is not anything arm64 specific here other than where you have
hooked into the low-level I/O accessors, you could consider adding this
as a generic facility to other architectures as well.

Also, have you looked at making mmiotrace less x86 specific and more
generic?
-- 
Florian