svn commit: r303497 - head/sys/dev/pci

[Ngie Cooper]

> On Jul 29, 2016, at 10:54, John Baldwin <jhb at FreeBSD.org> wrote:
> 
> Author: jhb
> Date: Fri Jul 29 17:54:21 2016
> New Revision: 303497
> URL: https://svnweb.freebsd.org/changeset/base/303497
> 
> Log:
>  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 at mail.ru> (SuperMicro X7 riser card)
>  Reported by:    Jeffrey E Pieper <jeffrey.e.pieper at intel.com>
>          (Intel X520 adapter)
>  MFC after:    1 week
>  Relnotes:    yes

Should this be done on a per-bus basis?
Thanks!
-Ngie