FreeBSD/src 7f215e0 (r354702)sys/dev/ntb ntb.c ntb.h, sys/dev/ntb/ntb_hw ntb_hw_amd.c ntb_hw_intel.c

Make ntb(4) send bus_get_dma_tag() requests to parent buses passing real
bus' child pointers instead of grandchilds.

DMAR does not like requests from devices not parented directly by PCI.

MFC after:      2 weeks
DeltaFile
+7-0sys/dev/ntb/ntb.c
+1-0sys/dev/ntb/ntb.h
+1-0sys/dev/ntb/ntb_hw/ntb_hw_amd.c
+1-0sys/dev/ntb/ntb_hw/ntb_hw_intel.c
+1-0sys/dev/ntb/ntb_hw/ntb_hw_plx.c
+11-05 files

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