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This patch calculates: -Total time spent by GPU with rails gated. -Total time spent by GPU with rails ungated. -Total Railgating Cycles. and dumps this information in debugfs file. This feature requires CONFIG_DEBUG_FS set to true. Bug 200195100 Change-Id: I1379f11237ce4900076947e18524caaa3304c7cb Signed-off-by: Deepak Goyal <dgoyal@nvidia.com> Reviewed-on: http://git-master/r/1178308 Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>