drm/i915: add dev.i915.oa_max_sample_rate sysctl
The maximum OA sampling frequency is now configurable via a dev.i915.oa_max_sample_rate sysctl parameter. Following the precedent set by perf's similar kernel.perf_event_max_sample_rate the default maximum rate is 100000Hz 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/20161107194957.3385-10-robert@sixbynine.org
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