[Intel-gfx] [OA][RFC] Exposing low-resolution engine business via sysfs

[FlightlessMango <flightlessmangoyt@gmail.com>]

Hi,

I am the developer of MangoHud[1], a Vulkan and OpenGL overlay for 
monitoring FPS / temperatures / CPU/GPU load and more.

I would like to add support for i915 (and xe in the future) but I am 
currently unable to do this easily because not everything I need is 
exposed directly to non-root users. Namely:

  * Engine business (RCS)
  * CPU, iGPU and dGPU power usage
  * IMC bandwith (nice to have but not mandatory)

This is a problem because it would require us to ship a setuid binary to 
poll these metrics for the overlay (we can't run games as root).

For your information, this is Intel-specific as AMD and NVIDIA are 
exposing these values directly. I understand the security concerns, but 
we are not asking for super precise information (1% accuracy is perfect).

Can we work together on this, what are your thoughts?

Thanks for your consideration.

//Simon Hallsten

[1] https://github.com/flightlessmango/MangoHud