tree bb7935c4b8651cdeba0e8915ca659894c085bbad
parent a35aee5b07aa0d86b5a251930cf715ab3b072fcc
author Mark Kettenis <kettenis@openbsd.org> 1674329272 +0100
committer Tom Rini <trini@konsulko.com> 1674848877 -0500

iommu: Add DMA mapping operations

In order to support IOMMUs in non-bypass mode we need device ops
to map and unmap DMA memory.  The map operation enters a mapping
for a region specified by CPU address and size into the translation
table of the IOMMU and returns a DMA address suitable for
programming the device to do DMA.  The unmap operation removes
this mapping from the translation table of the IOMMU.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>