gpu: nvgpu: handle SM reported MMU_NACK exception

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>

0 files changed, 0 insertions, 0 deletions