mirror of
git://nv-tegra.nvidia.com/linux-nvgpu.git
synced 2025-12-22 09:12:24 +03:00
c6cd82008f
Add NVGPU_IOCTL_CHANNEL_PREEMPT_NEXT ioctl to check host and FECS status and preempt pending load of context not belonging to the calling channel on GR engine during context switch. This should be called after a submit with NVGPU_SUBMIT_GPFIFO_FLAGS_RESCHEDULE_RUNLIST to decrease worst case submit to start latency for high interleave channel. There is less than 0.002% chance that the ioctl blocks up to couple miliseconds due to race condition of FECS status changing while being read. Also fix bug with host reschedule for multiple runlists which needs to write both runlist registers. Bug 1987640 Bug 1924808 Change-Id: I0b7e2f91bd18b0b20928e5a3311b9426b1bf1848 Signed-off-by: David Li <davli@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1549598 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>