PCI/P2PDMA: Add constants for map type results to upstream_bridge_distance()

Add constant flags to indicate how two devices will be mapped or if they
are unsupported. upstream_bridge_distance() will now return the
mapping type and the distance in a passed-by-reference argument.

This helps annotate the code better, but the main reason is so we can use
the information to store the required mapping method in an xarray.

Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Logan Gunthorpe <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Christian König <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>

0 files changed, 0 insertions, 0 deletions