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Add a generic profiler based on the channel kickoff profiler. This aims to provide a mechanism to allow engineers to (more) easily profile arbitrary software paths within nvgpu. Usage of this profiler is still primarily through debugfs. Next up is a generic debugfs interface for this profiler in the Linux code. The end goal for this is to profile the recovery code and generate interesting statistics. JIRA NVGPU-5606 Signed-off-by: Alex Waterman <alexw@nvidia.com> Change-Id: I99783ec7e5143855845bde4e98760ff43350456d Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2355319 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>