Quoting Bjorn Andersson (2019-01-16 20:29:40) > For devices attached to an IOMMU, translation between IOVA and physical > addresses is no longer 1:1 and dma-ranges should be specified to > describe the available IOVA address space. > > On SDM845 the busses are implemented with 36 address bits, so dma-ranges > must be defined to reduce the size of the IOVA address space from the 48 > bits supported by the SMMU. Without this DMA allocations may end up with > IOVAs outside the valid range, that gets truncated by the bus between > the device and its translation unit. > > Also extend ranges to describe the available address space. > > Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> > --- Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
