Konstantin Belousov b29d186cb9 Fix DMAR context allocations for the devices behind PCIe->PCI bridges
after dmar driver was converted to use rids.  The bus component to
calculate context page must be taken from the requestor rid, which is
a bridge, and not from the device bus number.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2015-01-09 02:10:44 +00:00
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