Chris Wilson writes:
> Tigerlake is plagued by spontaneous DMAR faults [reason 7, next page
> table ptr is invalid] which lead to GPU hangs. These faults occur when
> an iommu map is immediately reused. Adding further clflushes and
> barriers around either the GTT PTE or iommu PTE updates do not
Tigerlake is plagued by spontaneous DMAR faults [reason 7, next page
table ptr is invalid] which lead to GPU hangs. These faults occur when
an iommu map is immediately reused. Adding further clflushes and
barriers around either the GTT PTE or iommu PTE updates do not prevent
the faults. So far the
