drm/i915/gt: Always report the sample time for busy-stats
Return the monotonic timestamp (ktime_get()) at the time of sampling the busy-time. This is used in preference to taking ktime_get() separately before or after the read seqlock as there can be some large variance in reported timestamps. For selftests trying to ascertain that we are reporting accurate to within a few microseconds, even a small delay leads to the test failing. 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/20200617130916.15261-2-chris@chris-wilson.co.uk
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