drm/i915: Add a kerneldoc summary for i915_perf.c
In particular this tries to capture for posterity some of the early challenges we had with using the core perf infrastructure in case we ever want to revisit adapting perf for device metrics. Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NRobert Bragg <robert@sixbynine.org> Reviewed-by: NMatthew Auld <matthew.auld@intel.com> Reviewed-by: NSourab Gupta <sourab.gupta@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161107194957.3385-12-robert@sixbynine.org
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