This implements save and restore hooks for IOMMUs and implements
it the DART iommu.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Olof Johansson <olof@lixom.net>
Signed-off-by: NPaul Mackerras <paulus@samba.org>