PCI Error Recovery patchset

What follows is a set of patches to implement a PCI error recovery system. Some (newer) PCI controllers are able to detect and report PCI errors, these patches enable this hardware function.

-- the first patch adds documentation, explaining what this is and how
it works.
-- the next patch adds core infrastructure to include/linux/pci.h -- the next several patches add recovery support to three ethernet and
two scsi drivers.
-- the last patch is a big monster that implements the recovery
driver for the ppc64-specific pci controllers.

The first seven patches should apply cleanly to just about any recent kernel tree; the last patch requires GregKH's pci patchset, since some ppc64 functions changed recently.

--linas