Antonio Argenziano authored Jan 24, 2018 and Chris Wilson committed Feb 17, 2018

Since commit: drm/i915/scheduler: Support user-defined priorities, the
driver support an extra context param to set context's priority. Add
tests for that interface and update invalid tests.

v2:
	- Add arg size validation test. (Chris)
	- Add arg value overflow test. (Chris)
	- Add test for unsupported platforms. (Chris)
	- Feed interface with all priority values and in random order. (Chris)

v3:
	- Parametrize tests. (Chris)

v4:
	- Code-style refactoring. (Chris)

Signed-off-by: Antonio Argenziano <antonio.argenziano@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Winiarski <michal.winiarski@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>