Implement TCE translation for sPAPR VIO This patch implements the necessary infrastructure and hypercalls for sPAPR's TCE (Translation Control Entry) IOMMU mechanism. This is necessary for all virtual IO devices which do DMA (i.e. nearly all of them). Signed-off-by: Ben Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de>