powerpc/eeh: EEH device for VF

VFs and their corresponding pdn are created and released dynamically
when their PF's SRIOV capability is enabled and disabled. This creates
and releases EEH devices for VFs when creating and releasing their pdn
instances, which means EEH devices and pdn instances have same life
cycle. Also, VF's EEH device is identified by (struct eeh_dev::physfn).

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

@@ -141,6 +141,7 @@ struct eeh_dev {
 	struct pci_controller *phb;	/* Associated PHB		*/
 	struct pci_dn *pdn;		/* Associated PCI device node	*/
 	struct pci_dev *pdev;		/* Associated PCI device	*/
+	struct pci_dev *physfn;		/* Associated SRIOV PF		*/
 	struct pci_bus *bus;		/* PCI bus for partial hotplug	*/
 };
 

arch/powerpc/kernel/pci_dn.c

@@ -179,6 +179,7 @@ struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
 {
 #ifdef CONFIG_PCI_IOV
 	struct pci_dn *parent, *pdn;
+	struct eeh_dev *edev;
 	int i;
 
 	/* Only support IOV for now */
@@ -204,6 +205,12 @@ struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
 				 __func__, i);
 			return NULL;
 		}
+
+		/* Create the EEH device for the VF */
+		eeh_dev_init(pdn, pci_bus_to_host(pdev->bus));
+		edev = pdn_to_eeh_dev(pdn);
+		BUG_ON(!edev);
+		edev->physfn = pdev;
 	}
 #endif /* CONFIG_PCI_IOV */
 
@@ -215,6 +222,7 @@ void remove_dev_pci_data(struct pci_dev *pdev)
 #ifdef CONFIG_PCI_IOV
 	struct pci_dn *parent;
 	struct pci_dn *pdn, *tmp;
+	struct eeh_dev *edev;
 	int i;
 
 	/*
@@ -256,6 +264,13 @@ void remove_dev_pci_data(struct pci_dev *pdev)
 			    pdn->devfn != pci_iov_virtfn_devfn(pdev, i))
 				continue;
 
+			/* Release EEH device for the VF */
+			edev = pdn_to_eeh_dev(pdn);
+			if (edev) {
+				pdn->edev = NULL;
+				kfree(edev);
+			}
+
 			if (!list_empty(&pdn->list))
 				list_del(&pdn->list);