K 10
svn:author
V 6
andrew
K 8
svn:date
V 27
2015-12-24T09:40:29.430332Z
K 7
svn:log
V 477
Ads support to the xhci pci attachment to use MSI-X interrupts when
available. As with MSI interrupts these can be disabled by setting
hw.usb.xhci.msix to 0 in the loader.

MSI-X interrupts are needed on some hardware, for example the Cavium
ThunderX only supports them, and with this we don't fall back to polling.

PR:		204378
Reviewed by:	hselasky, jhb
MFC after:	1 week (after r292669)
Sponsored by:	ABT Systems Ltd
Differential Revision:	https://reviews.freebsd.org/D4698

END