MFC r312881:

MFC r312881:
Add support for device surprise removal and other PCI errors.

- When device disappears from PCI indicate error device state and:
  1) Trigger command completion for all pending commands
  2) Prevent new commands from executing and return:
     - success for modify and remove/cleanup commands
     - failure for create/query commands
  3) When reclaiming pages for a device in error state don't ask FW to
     return all given pages, just release the allocated memory

Sponsored by:	Mellanox Technologies

git-svn-id: svn://svn.freebsd.org/base/stable/10@322149 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f