drm/i915/selftests: Wrap a timer into a i915_sw_fence
For some selftests, we want to issue requests but delay them going to hardware. Furthermore, we don't want those requests to block indefinitely (or else we may hang the driver and block testing) so we want to employ a timeout. So naturally we want a fence that is automatically signaled by a timer. v2: Add kselftests. v3: Limit the API available to selftests; there isn't an overwhelming reason to export it universally. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171012125726.14736-2-chris@chris-wilson.co.ukReviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
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