tests/perf_pmu: Verify engine busyness accuracy
A subtest to verify that the engine busyness is reported with expected
accuracy on platforms where the feature is available.
We test three patterns: 2%, 50% and 98% load per engine.
v2:
* Use spin batch instead of nop calibration.
* Various tweaks.
v3:
* Change loops to be time based.
* Use __igt_spin_batch_new inside timing sensitive loops.
* Fixed PWM sleep handling.
v4:
* Use restarting spin batch.
* Calibrate more carefully by looking at the real PWM loop.
v5:
* Made standalone.
* Better info messages.
* Tweak sleep compensation.
v6:
* Some final tweaks. (Chris Wilson)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
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