PCI/P2PDMA: Refactor the p2pdma mapping helpers

The current scheme with a single helper to determine the P2P status
and map a scatterlist segment force users to always use the map_sg
helper to DMA map, which we're trying to get away from because they
are very cache inefficient.

Refactor the code so that there is a single helper that checks the P2P
state for a page, including the result that it is not a P2P page to
simplify the callers, and a second one to perform the address translation
for a bus mapped P2P transfer that does not depend on the scatterlist
structure.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Logan Gunthorpe <[email protected]>
Acked-by: Bjorn Helgaas <[email protected]>
Tested-by: Jens Axboe <[email protected]>
Reviewed-by: Luis Chamberlain <[email protected]>
Reviewed-by: Lu Baolu <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>
Signed-off-by: Marek Szyprowski <[email protected]>

0 files changed, 0 insertions, 0 deletions