powerpc/eeh: Create PE for VFs

This creates PEs for VFs in the weak function pcibios_bus_add_device().
Those PEs for VFs are identified with newly introduced flag EEH_PE_VF
so that we treat them differently during EEH recovery.
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Acked-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/eeh.h

@@ -72,6 +72,7 @@ struct pci_dn;
 #define EEH_PE_PHB	(1 << 1)	/* PHB PE    */
 #define EEH_PE_DEVICE 	(1 << 2)	/* Device PE */
 #define EEH_PE_BUS	(1 << 3)	/* Bus PE    */
+#define EEH_PE_VF	(1 << 4)	/* VF PE     */
 
 #define EEH_PE_ISOLATED		(1 << 0)	/* Isolated PE		*/
 #define EEH_PE_RECOVERING	(1 << 1)	/* Recovering PE	*/

arch/powerpc/kernel/eeh_pe.c

@@ -299,6 +299,9 @@ static struct eeh_pe *eeh_pe_get_parent(struct eeh_dev *edev)
 	 * EEH device already having associated PE, but
 	 * the direct parent EEH device doesn't have yet.
 	 */
+	if (edev->physfn)
+		pdn = pci_get_pdn(edev->physfn);
+	else
 		pdn = pdn ? pdn->parent : NULL;
 	while (pdn) {
 		/* We're poking out of PCI territory */
@@ -382,6 +385,9 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
 	}
 
 	/* Create a new EEH PE */
+	if (edev->physfn)
+		pe = eeh_pe_alloc(edev->phb, EEH_PE_VF);
+	else
 		pe = eeh_pe_alloc(edev->phb, EEH_PE_DEVICE);
 	if (!pe) {
 		pr_err("%s: out of memory!\n", __func__);

arch/powerpc/platforms/powernv/eeh-powernv.c

@@ -1503,6 +1503,22 @@ static struct eeh_ops pnv_eeh_ops = {
 	.restore_config		= pnv_eeh_restore_config
 };
 
+void pcibios_bus_add_device(struct pci_dev *pdev)
+{
+	struct pci_dn *pdn = pci_get_pdn(pdev);
+
+	if (!pdev->is_virtfn)
+		return;
+
+	/*
+	 * The following operations will fail if VF's sysfs files
+	 * aren't created or its resources aren't finalized.
+	 */
+	eeh_add_device_early(pdn);
+	eeh_add_device_late(pdev);
+	eeh_sysfs_add_device(pdev);
+}
+
 /**
  * eeh_powernv_init - Register platform dependent EEH operations
  *