Hi guys,
this is the next iteration of the fence array patch set.
Daniel suggested that I provide an example on how this functionality might be used by a driver. So I added a few additional patches in this series to show what I want to do with this in the amdgpu driver.
The main idea is that for each VMID we have a set of hardware fences which are currently using this VMID. Now when a new command submission needs a VMID we construct a fence array which should signal when any of the VMIDs becomes available and gives that back to our the scheduler.
This effort and my testing also found a rather stupid typo in the code and I also tried to incorporate the comments from Chris and Daniel as well.
I think it's ready to land now, but as usual feel free to take it apart.
Cheers, Christian.