John Baldwin 25a57bd64b Add a loader tunable (hw.pci.enable_pcie_hp) to disable PCI-e HotPlug.
Some systems and/or devices (such as riser cards) do not include a
non-compliant implementation of PCI-e HotPlug that can result in devices
not being attached (e.g. the HotPlug code might assume that a card is
being unplugged and will power the slot off and detach it).  This
tunable can be set to 0 to disable support for PCI-e HotPlug ignoring
the incorrect HotPlug state on these slots.

PR:		211081
Reported by:	Sergey Renkas <serg_ic@mail.ru> (SuperMicro X7 riser card)
Reported by:	Jeffrey E Pieper <jeffrey.e.pieper@intel.com>
	 	(Intel X520 adapter)
MFC after:	1 week
Relnotes:	yes
2016-07-29 17:54:21 +00:00
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