PCI: support for PCI Express fundamental reset

This is the first of three patches that implement a bit field that PCI
Express device drivers can use to indicate they need a fundamental reset
during error recovery.

By default, the EEH framework on powerpc does what's known as a "hot
reset" during recovery of a PCI Express device.  We've found a case
where the device needs a "fundamental reset" to recover properly.  The
current PCI error recovery and EEH frameworks do not support this
distinction.

The attached patch (courtesy of Richard Lary) adds a bit field to
pci_dev that indicates whether the device requires a fundamental reset
during recovery.

These patches supersede the previously submitted patch that implemented
a fundamental reset bit field.

Signed-off-by: Mike Mason <mmlnx@us.ibm.com>
Signed-off-by: Richard Lary <rlary@us.ibm.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

include/linux/pci.h

@@ -273,6 +273,7 @@ struct pci_dev {
 	unsigned int	ari_enabled:1;	/* ARI forwarding */
 	unsigned int	is_managed:1;
 	unsigned int	is_pcie:1;
+	unsigned int    needs_freset:1; /* Dev requires fundamental reset */
 	unsigned int	state_saved:1;
 	unsigned int	is_physfn:1;
 	unsigned int	is_virtfn:1;