April 7, 2021
8:56 p.m.
Folks Is there any kernel API or control mechanism for an IO-MMU that one could use to specify that a buffer earmarked for DMA would always have an IOVA greater than 4GB? Basically if I used pci_map_sg and passed a scatter list I would like the dma_address field in the scatterlist structure to be always greater than 4GB when it returned. Thanks S