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This patch performs the following improvements for VAB: 1) It avoids an infinite loop when collecting VAB information. Previously, nvgpu incorrectly assumed that the valid bit would be eventually set for the checker when polling. It may not be set if a VAB-related fault has occurred. 2) It handles the VAB_ERROR mmu fault which may be caused for various reasons: invalid vab buffer address, tracking in protected mode, etc. The recovery sequence is to set the vab buffer size to 0 and then to the original size. This clears the VAB_ERROR bit. After reseting, the old register values are again set in the recovery code sequence. 3) Use correct number of VAB buffers. There's only one VAB buffer on ga10b, not two. 4) Simplify logic. Bug 3374805 Bug 3465734 Bug 3473147 Change-Id: I716f460ef37cb848ddc56a64c6f83024c4bb9811 Signed-off-by: Martin Radev <mradev@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2621290 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>