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v3d: Add a perfetto datasource

Christian Gmeiner requested to merge austriancoder/mesa:v3d-perfetto-ds into main

What does this MR do and why?

This MR adds support a v3d perfetto datasource. There are some limitations that we need to take care of.

There can be only one perfmon active at a time.

There is a new state that a perfmon can enter: global perfmon. If a global perfmon exists, every job submit will automatically use the global perfmon. This ensures no application configured perfmon will be used (e.g. with the AMD_performacne_counter extension or GALLIUM_HUD).

There come some new rules/behaviours too:

  • There can only be ONE global perfmon.
  • If applications are using the perfmon infra, pps_producer will overrule it and the kernel will return -EAGAIN for jobs with a perfmon.

There can only be 32 perf signal sused for a perfmon.

We need to define the performance counter of interest when we start pps_producer.

V3D_DS_COUNTER=cycle-count,CLE-bin-thread-active-cycles,CLE-render-thread-active-cycles,QPU-total-uniform-cache-hit ./src/tool/pps/pps-producer

This MR is marked as draft, after the needed kernel patch landed in next: https://lore.kernel.org/all/20241202140615.74802-1-christian.gmeiner@gmail.com/

Edited by Christian Gmeiner

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