drm/i915: Flush idle barriers when waiting
If we do find ourselves with an idle barrier inside our active while waiting, attempt to flush it by emitting a pulse using the kernel context. Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Cc: Steve Carbonari <steven.carbonari@intel.com> Reviewed-by:
Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200225192206.1107336-1-chris@chris-wilson.co.uk
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