• Christoph Hellwig's avatar
    dma-mapping: provide a better default ->get_required_mask · 249baa54
    Christoph Hellwig authored
    Most dma_map_ops instances are IOMMUs that work perfectly fine in 32-bits
    of IOVA space, and the generic direct mapping code already provides its
    own routines that is intelligent based on the amount of memory actually
    present.  Wire up the dma-direct routine for the ARM direct mapping code
    as well, and otherwise default to the constant 32-bit mask.  This way
    we only need to override it for the occasional odd IOMMU that requires
    64-bit IOVA support, or IOMMU drivers that are more efficient if they
    can fall back to the direct mapping.
    Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
    249baa54
system-bus.c 18.8 KB