drm/i915/selftests: Teach requests to use all available engines
The request selftests straddle the boundary between checking the driver and the hardware. They are subject to the quirks of the underlying HW, but operate on top of the backend abstractions. The tests focus on the scheduler elements and so should check for interactions of the scheduler across all exposed engines. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191016125236.17960-1-chris@chris-wilson.co.uk
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