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

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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/20190730163545.4915-4-logang@deltatee.com
Link: https://lore.kernel.org/r/20190812173048.9186-4-logang@deltatee.com
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

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Logan Gunthorpe 2019-08-12 11:30:37 -06:00 • committed by Bjorn Helgaas

parent 0afea38143

commit 72583084e3

1 changed files with 58 additions and 37 deletions

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drivers/pci/p2pdma.c

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