[PATCH] dlpar regression for ppc64 - probe change

This patch contains the driver bits for enabling DLPAR and PCI Hotplug
for the new OF-based PCI probe.  This functionality was regressed when
the new PCI approach was introduced.  Please apply if appropriate.
Signed-off-by: John Rose <johnrose@austin.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/hotplug/rpadlpar_core.c

@@ -134,43 +134,6 @@ static void rpadlpar_claim_one_bus(struct pci_bus *b)
 		rpadlpar_claim_one_bus(child_bus);
 }
 
-static int pci_add_secondary_bus(struct device_node *dn,
-		struct pci_dev *bridge_dev)
-{
-	struct pci_dn *pdn = dn->data;
-	struct pci_controller *hose = pdn->phb;
-	struct pci_bus *child;
-	u8 sec_busno;
-
-	/* Get busno of downstream bus */
-	pci_read_config_byte(bridge_dev, PCI_SECONDARY_BUS, &sec_busno);
-
-	/* Allocate and add to children of bridge_dev->bus */
-	child = pci_add_new_bus(bridge_dev->bus, bridge_dev, sec_busno);
-	if (!child) {
-		printk(KERN_ERR "%s: could not add secondary bus\n", __FUNCTION__);
-		return -ENOMEM;
-	}
-
-	sprintf(child->name, "PCI Bus #%02x", child->number);
-
-	/* Fixup subordinate bridge bases and resources */
-	pcibios_fixup_bus(child);
-
-	/* Claim new bus resources */
-	rpadlpar_claim_one_bus(bridge_dev->bus);
-
-	if (hose->last_busno < child->number)
-		hose->last_busno = child->number;
-
-	pdn->bussubno = child->number;
-
-	/* ioremap() for child bus, which may or may not succeed */
-	remap_bus_range(child);
-
-	return 0;
-}
-
 static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
 					struct device_node *dev_dn)
 {
@@ -188,29 +151,41 @@ static struct pci_dev *dlpar_find_new_dev(struct pci_bus *parent,
 static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
 {
 	struct pci_dn *pdn = dn->data;
-	struct pci_controller *hose = pdn->phb;
+	struct pci_controller *phb = pdn->phb;
 	struct pci_dev *dev = NULL;
 
-	/* Scan phb bus for EADS device, adding new one to bus->devices */
-	if (!pci_scan_single_device(hose->bus, pdn->devfn)) {
-		printk(KERN_ERR "%s: found no device on bus\n", __FUNCTION__);
+	rpaphp_eeh_init_nodes(dn);
+	/* Add EADS device to PHB bus, adding new entry to bus->devices */
+	dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);
+	if (!dev) {
+		printk(KERN_ERR "%s: failed to create pci dev for %s\n",
+				__FUNCTION__, dn->full_name);
 		return NULL;
 	}
 
+	if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
+	    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
+		of_scan_pci_bridge(dn, dev);
+
+	rpaphp_init_new_devs(dev->subordinate);
+
+	/* Claim new bus resources */
+	rpadlpar_claim_one_bus(dev->bus);
+
+	/* ioremap() for child bus, which may or may not succeed */
+	(void) remap_bus_range(dev->bus);
+
 	/* Add new devices to global lists.  Register in proc, sysfs. */
-	pci_bus_add_devices(hose->bus);
+	pci_bus_add_devices(phb->bus);
 
 	/* Confirm new bridge dev was created */
-	dev = dlpar_find_new_dev(hose->bus, dn);
+	dev = dlpar_find_new_dev(phb->bus, dn);
 	if (dev) {
 		if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
 			printk(KERN_ERR "%s: unexpected header type %d\n",
 				__FUNCTION__, dev->hdr_type);
 			return NULL;
 		}
-
-		if (pci_add_secondary_bus(dn, dev))
-			return NULL;
 	}
 
 	return dev;
@@ -219,7 +194,6 @@ static struct pci_dev *dlpar_pci_add_bus(struct device_node *dn)
 static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
 {
 	struct pci_dev *dev;
-	int rc;
 
 	if (rpaphp_find_pci_bus(dn))
 		return -EINVAL;
@@ -232,15 +206,6 @@ static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
 		return -EIO;
 	}
 
-	if (dn->child) {
-		rc = rpaphp_config_pci_adapter(dev->subordinate);
-		if (rc < 0) {
-			printk(KERN_ERR "%s: unable to enable slot %s\n",
-				__FUNCTION__, drc_name);
-			return -EIO;
-		}
-	}
-
 	/* Add hotplug slot */
 	if (rpaphp_add_slot(dn)) {
 		printk(KERN_ERR "%s: unable to add hotplug slot %s\n",
@@ -435,6 +400,8 @@ int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
 				__FUNCTION__, drc_name);
 			return -EIO;
 		}
+	} else {
+		rpaphp_unconfig_pci_adapter(bus);
 	}
 
 	if (unmap_bus_range(bus)) {

drivers/pci/hotplug/rpaphp.h

@@ -93,6 +93,8 @@ extern int rpaphp_claim_resource(struct pci_dev *dev, int resource);
 extern int rpaphp_enable_pci_slot(struct slot *slot);
 extern int register_pci_slot(struct slot *slot);
 extern int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value);
+extern void rpaphp_init_new_devs(struct pci_bus *bus);
+extern void rpaphp_eeh_init_nodes(struct device_node *dn);
 
 extern int rpaphp_config_pci_adapter(struct pci_bus *bus);
 extern int rpaphp_unconfig_pci_adapter(struct pci_bus *bus);

drivers/pci/hotplug/rpaphp_pci.c

@@ -154,8 +154,7 @@ int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
 }
 
 /* Must be called before pci_bus_add_devices */
-static void 
-rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
+void rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
 {
 	struct pci_dev *dev;
 
@@ -184,6 +183,20 @@ rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
 	}
 }
 
+static void rpaphp_eeh_add_bus_device(struct pci_bus *bus)
+{
+	struct pci_dev *dev;
+
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		eeh_add_device_late(dev);
+		if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+			struct pci_bus *subbus = dev->subordinate;
+			if (subbus)
+				rpaphp_eeh_add_bus_device (subbus);
+		}
+	}
+}
+
 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
 {
 	u8 sec_busno;
@@ -217,6 +230,13 @@ static int rpaphp_pci_config_bridge(struct pci_dev *dev)
 	return 0;
 }
 
+void rpaphp_init_new_devs(struct pci_bus *bus)
+{
+	rpaphp_fixup_new_pci_devices(bus, 0);
+	rpaphp_eeh_add_bus_device(bus);
+}
+EXPORT_SYMBOL_GPL(rpaphp_init_new_devs);
+
 /*****************************************************************************
  rpaphp_pci_config_slot() will  configure all devices under the
  given slot->dn and return the the first pci_dev.
@@ -233,6 +253,17 @@ rpaphp_pci_config_slot(struct pci_bus *bus)
 	if (!dn || !dn->child)
 		return NULL;
 
+	if (systemcfg->platform == PLATFORM_PSERIES_LPAR) {
+		of_scan_bus(dn, bus);
+		if (list_empty(&bus->devices)) {
+			err("%s: No new device found\n", __FUNCTION__);
+			return NULL;
+		}
+
+		rpaphp_init_new_devs(bus);
+		pci_bus_add_devices(bus);
+		dev = list_entry(&bus->devices, struct pci_dev, bus_list);
+	} else {
 		slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
 
 		/* pci_scan_slot should find all children */
@@ -248,21 +279,25 @@ rpaphp_pci_config_slot(struct pci_bus *bus)
 		list_for_each_entry(dev, &bus->devices, bus_list) {
 			if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 				rpaphp_pci_config_bridge(dev);
+
+			rpaphp_eeh_add_bus_device(bus);
+		}
 	}
 
 	return dev;
 }
 
-static void enable_eeh(struct device_node *dn)
+void rpaphp_eeh_init_nodes(struct device_node *dn)
 {
 	struct device_node *sib;
 
 	for (sib = dn->child; sib; sib = sib->sibling) 
-		enable_eeh(sib);
+		rpaphp_eeh_init_nodes(sib);
 	eeh_add_device_early(dn);
 	return;
 	
 }
+EXPORT_SYMBOL_GPL(rpaphp_eeh_init_nodes);
 
 static void print_slot_pci_funcs(struct pci_bus *bus)
 {
@@ -289,7 +324,7 @@ int rpaphp_config_pci_adapter(struct pci_bus *bus)
 	if (!dn)
 		goto exit;
 
-	enable_eeh(dn);
+	rpaphp_eeh_init_nodes(dn);
 	dev = rpaphp_pci_config_slot(bus);
 	if (!dev) {
 		err("%s: can't find any devices.\n", __FUNCTION__);
@@ -331,6 +366,7 @@ int rpaphp_unconfig_pci_adapter(struct pci_bus *bus)
 	}
 	return 0;
 }
+EXPORT_SYMBOL_GPL(rpaphp_unconfig_pci_adapter);
 
 static int setup_pci_hotplug_slot_info(struct slot *slot)
 {
@@ -444,7 +480,7 @@ int rpaphp_enable_pci_slot(struct slot *slot)
 		retval = rpaphp_config_pci_adapter(slot->bus);
 		if (!retval) {
 			slot->state = CONFIGURED;
-			dbg("%s: PCI devices in slot[%s] has been configured\n", 
+			info("%s: devices in slot[%s] configured\n",
 					__FUNCTION__, slot->name);
 		} else {
 			slot->state = NOT_CONFIGURED;