drm/i915: add infrastructure to hold off preemption on a request
We want to set this flag in the next commit on requests containing perf queries so that the result of the perf query can just be a delta of global counters, rather than doing post processing of the OA buffer. Signed-off-by: NLionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> [ickle: add basic selftest for nopreempt] Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190709164227.25859-1-chris@chris-wilson.co.uk
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