Add support for high priority scheduling in amdgpu v6

Andres Rodriguez andresx7 at
Tue Mar 7 23:50:52 UTC 2017

Updated with Christian and Alex's feedback.

Also added missing initialization of ring->num_jobs[] to PATCH 18

Added a new patch:
[PATCH 19/22] drm/amdgpu: convert srbm lock to a spinlock

Also some new benchmarks for the high priority queue using a modified
computeparticles that only takes 0.2ms to execute:

The 0.2ms time was picked as an estimate of how long the reprojection
task would take to execute.

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