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Upon receiving MMU_FAULT error, MMU will forward MMU_NACK to SM If MMU_NACK is masked out, SM will simply release the semaphores And if semaphores are released before MMU fault is handled, user space could see that operation as successful incorrectly Fix this by handling SM reported MMU_NACK exception Enable MMU_NACK reporting in gv11b_gr_set_hww_esr_report_mask In MMU_NACK handling path, we just set the error notifier and clear the interrupt so that the User Space sees the error as soon as semaphores are released by SM And MMU_FAULT handling path will take care of triggering RC recovery anyways Also add necessary h/w accessors for mmu_nack Bug 2040594 Jira NVGPU-473 Change-Id: Ic925c2d3f3069016c57d177713066c29ab39dc3d Signed-off-by: Deepak Nibade <dnibade@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1631708 GVS: Gerrit_Virtual_Submit Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>