[PATCH v4 00/30] Refine PCI scan interfaces and make generic pci host bridge

@@ -446,6 +446,7 @@ static int pcifront_scan_root(struct pcifront_device *pdev,
 				 unsigned int domain, unsigned int bus)
 {
 	struct pci_bus *b;
+	LIST_HEAD(resources);
 	struct pcifront_sd *sd = NULL;
 	struct pci_bus_entry *bus_entry = NULL;
 	int err = 0;

@@ -470,17 +471,20 @@ static int pcifront_scan_root(struct pcifront_device *pdev,
 		err = -ENOMEM;
 		goto err_out;
 	}
+	pci_add_resource(&resources, &ioport_resource);
+	pci_add_resource(&resources, &iomem_resource);
 	pcifront_init_sd(sd, domain, bus, pdev);
 
 	pci_lock_rescan_remove();
 
-	b = pci_scan_bus_parented(&pdev->xdev->dev, bus,
-				  &pcifront_bus_ops, sd);
+	b = pci_scan_root_bus(&pdev->xdev->dev, bus,
+				  &pcifront_bus_ops, sd, &resources);
 	if (!b) {
 		dev_err(&pdev->xdev->dev,
 			"Error creating PCI Frontend Bus!\n");
 		err = -ENOMEM;
 		pci_unlock_rescan_remove();
+		pci_free_resource_list(&resources);
 		goto err_out;
 	}
 

@@ -488,7 +492,7 @@ static int pcifront_scan_root(struct pcifront_device *pdev,
 
 	list_add(&bus_entry->list, &pdev->root_buses);
 
-	/* pci_scan_bus_parented skips devices which do not have a have
+	/* pci_scan_root_bus skips devices which do not have a have
 	* devfn==0. The pcifront_scan_bus enumerates all devfn. */
 	err = pcifront_scan_bus(pdev, domain, bus, b);
 

@@ -253,6 +253,7 @@ nautilus_init_pci(void)
 	   for the root bus, so just clear it. */
 	bus->self = NULL;
 	pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
+	pci_bus_add_devices(bus);
 }
 
 /*

@@ -319,6 +319,7 @@ static int __init mcf_pci_init(void)
 	pci_fixup_irqs(pci_common_swizzle, mcf_pci_map_irq);
 	pci_bus_size_bridges(rootbus);
 	pci_bus_assign_resources(rootbus);
+	pci_bus_add_devices(rootbus);
 	return 0;
 }
 

@@ -391,6 +391,8 @@ static void __init pcic_pbm_scan_bus(struct linux_pcic *pcic)
 	struct linux_pbm_info *pbm = &pcic->pbm;
 
 	pbm->pci_bus = pci_scan_bus(pbm->pci_first_busno, &pcic_ops, pbm);
+	if (pbm->pci_bus)
+		pci_bus_add_devices(pbm->pci_bus);
 #if 0 /* deadwood transplanted from sparc64 */
 	pci_fill_in_pbm_cookies(pbm->pci_bus, pbm, pbm->prom_node);
 	pci_record_assignments(pbm, pbm->pci_bus);

@@ -266,17 +266,12 @@ static int __init pci_common_init(void)
 	pci_fixup_irqs(pci_common_swizzle, pci_puv3_map_irq);
 
 	if (!pci_has_flag(PCI_PROBE_ONLY)) {
-		/*
-		 * Size the bridge windows.
-		 */
+		/* Size the bridge windows. */
 		pci_bus_size_bridges(puv3_bus);
-
-		/*
-		 * Assign resources.
-		 */
+		/* Assign resources. */
 		pci_bus_assign_resources(puv3_bus);
 	}
-
+	pci_bus_add_devices(puv3_bus);
 	return 0;
 }
 subsys_initcall(pci_common_init);

@@ -738,7 +738,7 @@ static void ibm_unconfigure_device(struct pci_func *func)
  */
 static u8 bus_structure_fixup(u8 busno)
 {
-	struct pci_bus *bus;
+	struct pci_bus *bus, *b;
 	struct pci_dev *dev;
 	u16 l;
 

@@ -765,7 +765,9 @@ static u8 bus_structure_fixup(u8 busno)
 					(l != 0x0000) && (l != 0xffff)) {
 			debug("%s - Inside bus_structure_fixup()\n",
 							__func__);
-			pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL);
+			b = pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL);
+			if (b)
+				pci_bus_add_devices(b);
 			break;
 		}
 	}

@@ -2123,7 +2123,6 @@ struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
 	b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
 	if (b) {
 		pci_scan_child_bus(b);
-		pci_bus_add_devices(b);
 	} else {
 		pci_free_resource_list(&resources);
 	}

@@ -206,7 +206,7 @@ nautilus_init_pci(void)
 	unsigned long memtop = max_low_pfn << PAGE_SHIFT;
 
 	/* Scan our single hose.  */
-	bus = pci_scan_bus(0, alpha_mv.pci_ops, hose);
+	bus = pci_scan_bus_legacy(0, alpha_mv.pci_ops, hose);
 	hose->bus = bus;
 	pcibios_claim_one_bus(bus);
 

@@ -312,7 +312,7 @@ static int __init mcf_pci_init(void)
 	set_current_state(TASK_UNINTERRUPTIBLE);
 	schedule_timeout(msecs_to_jiffies(200));
 
-	rootbus = pci_scan_bus(0, &mcf_pci_ops, NULL);
+	rootbus = pci_scan_bus_legacy(0, &mcf_pci_ops, NULL);
 	rootbus->resource[0] = &mcf_pci_io;
 	rootbus->resource[1] = &mcf_pci_mem;
 

@@ -390,7 +390,7 @@ static void __init pcic_pbm_scan_bus(struct linux_pcic *pcic)
 {
 	struct linux_pbm_info *pbm = &pcic->pbm;
 
-	pbm->pci_bus = pci_scan_bus(pbm->pci_first_busno, &pcic_ops, pbm);
+	pbm->pci_bus = pci_scan_bus_legacy(pbm->pci_first_busno, &pcic_ops, pbm);
 	if (pbm->pci_bus)
 		pci_bus_add_devices(pbm->pci_bus);
 #if 0 /* deadwood transplanted from sparc64 */

@@ -258,7 +258,7 @@ static int __init pci_common_init(void)
 
 	pci_puv3_preinit();
 
-	puv3_bus = pci_scan_bus(0, &pci_puv3_ops, NULL);
+	puv3_bus = pci_scan_bus_legacy(0, &pci_puv3_ops, NULL);
 
 	if (!puv3_bus)
 		panic("PCI: unable to scan bus!");

@@ -765,7 +765,7 @@ static u8 bus_structure_fixup(u8 busno)
 					(l != 0x0000) && (l != 0xffff)) {
 			debug("%s - Inside bus_structure_fixup()\n",
 							__func__);
-			b = pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL);
+			b = pci_scan_bus_legacy(busno, ibmphp_pci_bus->ops, NULL);
 			if (b)
 				pci_bus_add_devices(b);
 			break;

@@ -2091,7 +2091,7 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
 }
 EXPORT_SYMBOL(pci_scan_root_bus);
 
-struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
+struct pci_bus *pci_scan_bus_legacy(int bus, struct pci_ops *ops,
 					void *sysdata)
 {
 	LIST_HEAD(resources);

@@ -2108,7 +2108,7 @@ struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
 	}
 	return b;
 }
-EXPORT_SYMBOL(pci_scan_bus);
+EXPORT_SYMBOL(pci_scan_bus_legacy);
 
 /**
  * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.

@@ -769,7 +769,7 @@ void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
 void pcibios_scan_specific_bus(int busn);
 struct pci_bus *pci_find_bus(int domain, int busnr);
 void pci_bus_add_devices(const struct pci_bus *bus);
-struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
+struct pci_bus *pci_scan_bus_legacy(int bus, struct pci_ops *ops, void *sysdata);
 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 				    struct pci_ops *ops, void *sysdata,
 				    struct list_head *resources);

@@ -2091,25 +2091,6 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
 }
 EXPORT_SYMBOL(pci_scan_root_bus);
 
-/* Deprecated; use pci_scan_root_bus() instead */
-struct pci_bus *pci_scan_bus_parented(struct device *parent,
-		int bus, struct pci_ops *ops, void *sysdata)
-{
-	LIST_HEAD(resources);
-	struct pci_bus *b;
-
-	pci_add_resource(&resources, &ioport_resource);
-	pci_add_resource(&resources, &iomem_resource);
-	pci_add_resource(&resources, &busn_resource);
-	b = pci_create_root_bus(parent, bus, ops, sysdata, &resources);
-	if (b)
-		pci_scan_child_bus(b);
-	else
-		pci_free_resource_list(&resources);
-	return b;
-}
-EXPORT_SYMBOL(pci_scan_bus_parented);
-
 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
 					void *sysdata)
 {

@@ -769,8 +769,6 @@ void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
 void pcibios_scan_specific_bus(int busn);
 struct pci_bus *pci_find_bus(int domain, int busnr);
 void pci_bus_add_devices(const struct pci_bus *bus);
-struct pci_bus *pci_scan_bus_parented(struct device *parent, int bus,
-				      struct pci_ops *ops, void *sysdata);
 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 				    struct pci_ops *ops, void *sysdata,

@@ -8,6 +8,9 @@
 
 #include "pci.h"
 
+static LIST_HEAD(pci_host_bridge_list);
+static DEFINE_MUTEX(phb_mutex);
+
 static void pci_release_host_bridge_dev(struct device *dev)
 {
 	struct pci_host_bridge *bridge = to_pci_host_bridge(dev);

@@ -25,7 +28,7 @@ struct pci_host_bridge *pci_create_host_bridge(
 	int error;
 	int bus = PCI_BUSNUM(db);
 	int domain = PCI_DOMAIN(db);
-	struct pci_host_bridge *host;
+	struct pci_host_bridge *host, *temp;
 	struct resource_entry *window, *n;
 
 	host = kzalloc(sizeof(*host), GFP_KERNEL);

@@ -40,6 +43,18 @@ struct pci_host_bridge *pci_create_host_bridge(
 	 */
 	pci_host_assign_domain_nr(host);
 
+	mutex_lock(&phb_mutex);
+	list_for_each_entry(temp, &pci_host_bridge_list, list)
+		if (temp->domain == host->domain
+				&& temp->busnum == host->busnum) {
+			dev_dbg(&host->dev, "pci host bridge pci%04x:%02x exist\n",
+					host->domain, host->busnum);
+			mutex_unlock(&phb_mutex);
+			kfree(host);
+			return NULL;
+		}
+	mutex_unlock(&phb_mutex);
+
 	host->dev.parent = parent;
 	INIT_LIST_HEAD(&host->windows);
 	host->dev.release = pci_release_host_bridge_dev;

@@ -55,12 +70,19 @@ struct pci_host_bridge *pci_create_host_bridge(
 	resource_list_for_each_entry_safe(window, n, resources)
 		list_move_tail(&window->node, &host->windows);
 
+	mutex_lock(&phb_mutex);
+	list_add_tail(&host->list, &pci_host_bridge_list);
+	mutex_unlock(&phb_mutex);
 	return host;
 }
 EXPORT_SYMBOL(pci_create_host_bridge);
 
 void pci_free_host_bridge(struct pci_host_bridge *host)
 {
+	mutex_lock(&phb_mutex);
+	list_del(&host->list);
+	mutex_unlock(&phb_mutex);
+
 	device_unregister(&host->dev);
 }
 

@@ -1869,7 +1869,7 @@ static struct pci_bus *__pci_create_root_bus(
 		void *sysdata)
 {
 	int error;
-	struct pci_bus *b, *b2;
+	struct pci_bus *b;
 	struct resource_entry *window;
 	struct device *parent;
 	struct resource *res;

@@ -1886,12 +1886,6 @@ static struct pci_bus *__pci_create_root_bus(
 	b->ops = ops;
 	b->number = b->busn_res.start = bridge->busnum;
 	pci_bus_assign_domain_nr(b, parent);
-	b2 = pci_find_bus(pci_domain_nr(b), b->number);
-	if (b2) {
-		/* If we already got to this bus through a different bridge, ignore it */
-		dev_dbg(&b2->dev, "bus already known\n");
-		goto err_out;
-	}
 
 	bridge->bus = b;
 	b->bridge = get_device(&bridge->dev);

@@ -406,6 +406,7 @@ struct pci_host_bridge {
 	struct device dev;
 	struct pci_bus *bus;		/* root bus */
 	struct list_head windows;	/* resource_entry */
+	struct list_head list;
 	void (*release_fn)(struct pci_host_bridge *);
 	void *release_data;
 };

@@ -129,7 +129,7 @@ struct machdep_calls {
 	void		(*pcibios_fixup)(void);
 	int		(*pci_probe_mode)(struct pci_bus *);
 	void		(*pci_irq_fixup)(struct pci_dev *dev);
-	int		(*pcibios_set_root_bus_speed)(struct pci_host_bridge
+	void		(*pcibios_set_root_bus_speed)(struct pci_host_bridge
 				*bridge);
 
 	/* To setup PHBs when using automatic OF platform driver for PCI */

@@ -767,14 +767,33 @@ int pci_proc_domain(struct pci_bus *bus)
 	return 1;
 }
 
-int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
+static void pci_host_bridge_set_root_bus_speed(
+		struct pci_host_bridge *bridge)
 {
 	if (ppc_md.pcibios_set_root_bus_speed)
-		return ppc_md.pcibios_set_root_bus_speed(bridge);
-	
-	return 0;
+		ppc_md.pcibios_set_root_bus_speed(bridge);
 }
 
+static void pci_host_bridge_of_scan_bus(struct pci_host_bridge *host)
+{
+	int mode = PCI_PROBE_NORMAL;
+	struct pci_bus *bus = host->bus;
+	struct pci_controller *hose = dev_get_drvdata(&host->dev);
+
+	/* Get probe mode and perform scan */
+	if (hose->dn && ppc_md.pci_probe_mode)
+		mode = ppc_md.pci_probe_mode(bus);
+
+	pr_debug("    probe mode: %d\n", mode);
+	if (mode == PCI_PROBE_DEVTREE)
+		of_scan_bus(hose->dn, bus);
+
+	if (mode == PCI_PROBE_NORMAL) {
+		pci_bus_update_busn_res_end(bus, 255);
+		hose->last_busno = pci_scan_child_bus(bus);
+		pci_bus_update_busn_res_end(bus, hose->last_busno);
+	}
+}
 /* This header fixup will do the resource fixup for all devices as they are
  * probed, but not for bridge ranges
  */

@@ -1587,6 +1606,11 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
 	return of_node_get(hose->dn);
 }
 
+static struct pci_host_bridge_ops phb_ops = {
+	.phb_set_root_bus_speed = pci_host_bridge_set_root_bus_speed,
+	.phb_of_scan_bus = pci_host_bridge_of_scan_bus,
+};
+
 /**
  * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus
  * @hose: Pointer to the PCI host controller instance structure

@@ -1594,9 +1618,8 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
 void pcibios_scan_phb(struct pci_controller *hose)
 {
 	LIST_HEAD(resources);
-	struct pci_bus *bus;
+	struct pci_host_bridge *host;
 	struct device_node *node = hose->dn;
-	int mode;
 
 	pr_debug("PCI: Scanning PHB %s\n", of_node_full_name(node));
 

@@ -1612,30 +1635,16 @@ void pcibios_scan_phb(struct pci_controller *hose)
 	pci_add_resource(&resources, &hose->busn);
 
 	/* Create an empty bus for the toplevel */
-	bus = pci_create_root_bus(hose->parent, 
+	host = pci_scan_root_bridge(hose->parent, 
 			PCI_DOMBUS(hose->global_number, hose->first_busno),
-			hose->ops, hose, &resources);
-	if (bus == NULL) {
-		pr_err("Failed to create bus for PCI domain %04x\n",
+			hose->ops, hose, &resources, &phb_ops);
+	if (host == NULL) {
+		pr_err("Failed to create host bridge for PCI domain %04x\n",
 			hose->global_number);
 		pci_free_resource_list(&resources);
 		return;
 	}
-	hose->bus = bus;
-
-	/* Get probe mode and perform scan */
-	mode = PCI_PROBE_NORMAL;
-	if (node && ppc_md.pci_probe_mode)
-		mode = ppc_md.pci_probe_mode(bus);
-	pr_debug("    probe mode: %d\n", mode);
-	if (mode == PCI_PROBE_DEVTREE)
-		of_scan_bus(node, bus);
-
-	if (mode == PCI_PROBE_NORMAL) {
-		pci_bus_update_busn_res_end(bus, 255);
-		hose->last_busno = pci_scan_child_bus(bus);
-		pci_bus_update_busn_res_end(bus, hose->last_busno);
-	}
+	hose->bus = host->bus;
 
 	/* Platform gets a chance to do some global fixups before
 	 * we proceed to resource allocation

@@ -1644,9 +1653,9 @@ void pcibios_scan_phb(struct pci_controller *hose)
 		ppc_md.pcibios_fixup_phb(hose);
 
 	/* Configure PCI Express settings */
-	if (bus && !pci_has_flag(PCI_PROBE_ONLY)) {
+	if (host->bus && !pci_has_flag(PCI_PROBE_ONLY)) {
 		struct pci_bus *child;
-		list_for_each_entry(child, &bus->children, node)
+		list_for_each_entry(child, &host->bus->children, node)
 			pcie_bus_configure_settings(child);
 	}
 }

@@ -110,7 +110,7 @@ static void fixup_winbond_82c105(struct pci_dev* dev)
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
 			 fixup_winbond_82c105);
 
-int pseries_set_root_bus_speed(struct pci_host_bridge *bridge)
+void pseries_set_root_bus_speed(struct pci_host_bridge *bridge)
 {
 	struct device_node *dn, *pdn;
 	struct pci_bus *bus;

@@ -121,7 +121,7 @@ int pseries_set_root_bus_speed(struct pci_host_bridge *bridge)
 
 	dn = pcibios_get_phb_of_node(bus);
 	if (!dn)
-		return 0;
+		return;
 
 	for (pdn = dn; pdn != NULL; pdn = of_get_next_parent(pdn)) {
 		rc = of_property_read_u32_array(pdn,

@@ -135,7 +135,7 @@ int pseries_set_root_bus_speed(struct pci_host_bridge *bridge)
 
 	if (rc) {
 		pr_debug("no ibm,pcie-link-speed-stats property\n");
-		return 0;
+		return;
 	}
 
 	switch (pcie_link_speed_stats[0]) {

@@ -168,5 +168,5 @@ int pseries_set_root_bus_speed(struct pci_host_bridge *bridge)
 		break;
 	}
 
-	return 0;
+	return;
 }

@@ -63,7 +63,7 @@ extern int dlpar_detach_node(struct device_node *);
 
 /* PCI root bridge prepare function override for pseries */
 struct pci_host_bridge;
-int pseries_set_root_bus_speed(struct pci_host_bridge *bridge);
+void pseries_set_root_bus_speed(struct pci_host_bridge *bridge);
 
 unsigned long pseries_memory_block_size(void);
 

@@ -364,12 +364,12 @@ sn_acpi_get_pcidev_info(struct pci_dev *dev, struct pcidev_info **pcidev_info,
         status = acpi_evaluate_integer(rootbus_handle, METHOD_NAME__SEG, NULL,
                                        &segment);
         if (ACPI_SUCCESS(status)) {
-		if (segment != pci_domain_nr(dev)) {
+		if (segment != pci_domain_nr(dev->bus)) {
 			acpi_get_name(rootbus_handle, ACPI_FULL_PATHNAME,
 				&name_buffer);
 			printk(KERN_ERR
 			       "%s: Segment number mismatch, 0x%llx vs 0x%x for: %s\n",
-			       __func__, segment, pci_domain_nr(dev),
+			       __func__, segment, pci_domain_nr(dev->bus),
 			       (char *)name_buffer.pointer);
 			kfree(name_buffer.pointer);
 			return 1;

@@ -407,7 +407,7 @@ sn_acpi_get_pcidev_info(struct pci_dev *dev, struct pcidev_info **pcidev_info,
 	/* Build up the pcidev_info.pdi_slot_host_handle */
 	host_devfn = get_host_devfn(pcidev_match.handle, rootbus_handle);
 	(*pcidev_info)->pdi_slot_host_handle =
-			((unsigned long) pci_domain_nr(dev) << 40) |
+			((unsigned long) pci_domain_nr(dev->bus) << 40) |
 					/* bus == 0 */
 					host_devfn;
 	return 0;

@@ -164,7 +164,7 @@ sn_io_slot_fixup(struct pci_dev *dev)
 		panic("%s: Unable to alloc memory for sn_irq_info", __func__);
 
 	/* Call to retrieve pci device information needed by kernel. */
-	status = sal_get_pcidev_info((u64) pci_domain_nr(dev),
+	status = sal_get_pcidev_info((u64) pci_domain_nr(dev->bus),
 		(u64) dev->bus->number,
 		dev->devfn,
 		(u64) __pa(pcidev_info),

@@ -650,12 +650,25 @@ static void pci_claim_bus_resources(struct pci_bus *bus)
 		pci_claim_bus_resources(child_bus);
 }
 
+static void pci_host_bridge_of_scan_bus(
+		struct pci_host_bridge *host)
+{
+	struct pci_pbm_info *pbm = dev_get_drvdata(&host->dev);
+	struct device_node *node = pbm->op->dev.of_node;
+
+	pci_of_scan_bus(pbm, node, host->bus);
+}
+
+static struct pci_host_bridge_ops phb_ops = {
+	.phb_of_scan_bus = pci_host_bridge_of_scan_bus,
+};
+
 struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
 				 struct device *parent)
 {
 	LIST_HEAD(resources);
 	struct device_node *node = pbm->op->dev.of_node;
-	struct pci_bus *bus;
+	struct pci_host_bridge *host;
 
 	printk("PCI: Scanning PBM %s\n", node->full_name);
 

@@ -667,23 +680,22 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
 	pbm->busn.end	= pbm->pci_last_busno;
 	pbm->busn.flags	= IORESOURCE_BUS;
 	pci_add_resource(&resources, &pbm->busn);
-	bus = pci_create_root_bus(parent, 
+	host = pci_scan_root_bridge(parent, 
 			PCI_DOMBUS(pbm->index, pbm->pci_first_busno), 
-			pbm->pci_ops, pbm, &resources);
-	if (!bus) {
-		printk(KERN_ERR "Failed to create bus for %s\n",
+			pbm->pci_ops, pbm, &resources, &phb_ops);
+	if (!host) {
+		printk(KERN_ERR "Failed to create host bridge for %s\n",
 		       node->full_name);
 		pci_free_resource_list(&resources);
 		return NULL;
 	}
 
-	pci_of_scan_bus(pbm, node, bus);
-	pci_bus_add_devices(bus);
-	pci_bus_register_of_sysfs(bus);
+	pci_bus_add_devices(host->bus);
+	pci_bus_register_of_sysfs(host->bus);
 
-	pci_claim_bus_resources(bus);
+	pci_claim_bus_resources(host->bus);
 
-	return bus;
+	return host->bus;
 }
 
 void pcibios_fixup_bus(struct pci_bus *pbus)

@@ -728,13 +728,11 @@ static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
 	struct pcie_port *pp = sys_to_pcie(sys);
 
 	pp->root_bus_nr = sys->busnr;
-	bus = pci_create_root_bus(pp->dev, sys->busnr,
+	bus = pci_scan_root_bus(pp->dev, sys->busnr,
 				  &dw_pcie_ops, sys, &sys->resources);
 	if (!bus)
 		return NULL;
 
-	pci_scan_child_bus(bus);
-
 	if (bus && pp->ops->scan_bus)
 		pp->ops->scan_bus(pp);
 

@@ -397,33 +397,6 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
 	acpi_unlock_hp_context();
 }
 
-/**
- * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
- * @bus: bus to start search with
- */
-static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
-{
-	struct pci_bus *tmp;
-	unsigned char max, n;
-
-	/*
-	 * pci_bus_max_busnr will return the highest
-	 * reserved busnr for all these children.
-	 * that is equivalent to the bus->subordinate
-	 * value.  We don't want to use the parent's
-	 * bus->subordinate value because it could have
-	 * padding in it.
-	 */
-	max = bus->busn_res.start;
-
-	list_for_each_entry(tmp, &bus->children, node) {
-		n = pci_bus_max_busnr(tmp);
-		if (n > max)
-			max = n;
-	}
-	return max;
-}
-
 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
 {
 	struct acpiphp_func *func;

@@ -489,7 +462,7 @@ static void enable_slot(struct acpiphp_slot *slot)
 	LIST_HEAD(add_list);
 
 	acpiphp_rescan_slot(slot);
-	max = acpiphp_max_busnr(bus);
+	max = pci_bus_child_max_busnr(bus);
 	for (pass = 0; pass < 2; pass++) {
 		list_for_each_entry(dev, &bus->devices, bus_list) {
 			if (PCI_SLOT(dev->devfn) != slot->device)

@@ -121,7 +121,30 @@ unsigned char pci_bus_max_busnr(struct pci_bus *bus)
 	}
 	return max;
 }
-EXPORT_SYMBOL_GPL(pci_bus_max_busnr);
+
+unsigned char pci_bus_child_max_busnr(struct pci_bus *bus)
+{
+	struct pci_bus *tmp;
+	unsigned char max, n;
+
+	/*
+	 * pci_bus_max_busnr will return the highest
+	 * reserved busnr for all these children.
+	 * that is equivalent to the bus->subordinate
+	 * value.  We don't want to use the parent's
+	 * bus->subordinate value because it could have
+	 * padding in it.
+	 */
+	max = bus->busn_res.start;
+
+	list_for_each_entry(tmp, &bus->children, node) {
+		n = pci_bus_max_busnr(tmp);
+		if (n > max)
+			max = n;
+	}
+	return max;
+}
+EXPORT_SYMBOL_GPL(pci_bus_child_max_busnr);
 
 #ifdef CONFIG_HAS_IOMEM
 void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)

@@ -1183,7 +1183,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
 void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
 		  void *userdata);
 int pci_cfg_space_size(struct pci_dev *dev);
-unsigned char pci_bus_max_busnr(struct pci_bus *bus);
+unsigned char pci_bus_child_max_busnr(struct pci_bus *bus);
 void pci_setup_bridge(struct pci_bus *bus);
 resource_size_t pcibios_window_alignment(struct pci_bus *bus,
 					 unsigned long type);

@@ -977,15 +977,11 @@ static int __init dino_probe(struct parisc_device *dev)
 	if (dino_dev->hba.gmmio_space.flags)
 		pci_add_resource(&resources, &dino_dev->hba.gmmio_space);
 
-	dino_dev->hba.bus_num.start = dino_current_bus;
-	dino_dev->hba.bus_num.end = 255;
-	dino_dev->hba.bus_num.flags = IORESOURCE_BUS;
-	pci_add_resource(&resources, &dino_dev->hba.bus_num);
 	/*
 	** It's not used to avoid chicken/egg problems
 	** with configuration accessor functions.
 	*/
-	dino_dev->hba.hba_bus = bus = pci_create_root_bus(&dev->dev,
+	dino_dev->hba.hba_bus = bus = pci_scan_root_bus(&dev->dev,
 			 dino_current_bus, &dino_cfg_ops, NULL, &resources);
 	if (!bus) {
 		printk(KERN_ERR "ERROR: failed to scan PCI bus on %s (duplicate bus number %d?)\n",

@@ -996,13 +992,10 @@ static int __init dino_probe(struct parisc_device *dev)
 		return 0;
 	}
 
-	max = pci_scan_child_bus(bus);
-	pci_bus_update_busn_res_end(bus, max);
-
 	/* This code *depends* on scanning being single threaded
 	 * if it isn't, this global bus number count will fail
 	 */
-	dino_current_bus = max + 1;
+	dino_current_bus = bus->busn_res.end + 1;
 	pci_bus_assign_resources(bus);
 	pci_bus_add_devices(bus);
 	return 0;

@@ -1422,7 +1422,6 @@ lba_driver_probe(struct parisc_device *dev)
 	void *tmp_obj;
 	char *version;
 	void __iomem *addr = ioremap_nocache(dev->hpa.start, 4096);
-	int max;
 
 	/* Read HW Rev First */
 	func_class = READ_REG32(addr + LBA_FCLASS);

@@ -1563,15 +1562,13 @@ lba_driver_probe(struct parisc_device *dev)
 
 	dev->dev.platform_data = lba_dev;
 	lba_bus = lba_dev->hba.hba_bus =
-		pci_create_root_bus(&dev->dev, lba_dev->hba.bus_num.start,
+		pci_scan_root_bus(&dev->dev, lba_dev->hba.bus_num.start,
 				    cfg_ops, NULL, &resources);
 	if (!lba_bus) {
 		pci_free_resource_list(&resources);
 		return 0;
 	}
 
-	max = pci_scan_child_bus(lba_bus);
-
 	/* This is in lieu of calling pci_assign_unassigned_resources() */
 	if (is_pdc_pat()) {
 		/* assign resources to un-initialized devices */

@@ -1599,7 +1596,7 @@ lba_driver_probe(struct parisc_device *dev)
 		lba_dev->flags |= LBA_FLAG_SKIP_PROBE;
 	}
 
-	lba_next_bus = max + 1;
+	lba_next_bus = pci_bus_child_max_busnr(lba_bus) + 1;
 	pci_bus_add_devices(lba_bus);
 
 	/* Whew! Finally done! Tell services we got this one covered. */

@@ -1852,7 +1852,7 @@ void __weak pcibios_remove_bus(struct pci_bus *bus)
 {
 }
 
-static struct pci_bus *__pci_create_root_bus(
+static struct pci_bus *pci_create_root_bus(
 		struct pci_host_bridge *bridge, struct pci_ops *ops)
 {
 	int error;

@@ -1935,18 +1935,6 @@ err_out:
 	return NULL;
 }
 
-struct pci_bus *pci_create_root_bus(struct device *parent, u32 db,
-		struct pci_ops *ops, void *sysdata, struct list_head *resources)
-{
-	struct pci_host_bridge *host;
-
-	host = pci_create_host_bridge(parent, db, resources, sysdata, NULL);
-	if (!host)
-		return NULL;
-	
-	return __pci_create_root_bus(host, ops);
-}
-
 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
 {
 	struct resource *res = &b->busn_res;

@@ -2024,7 +2012,7 @@ static struct pci_bus *__pci_scan_root_bus(
 			break;
 		}
 
-	b = __pci_create_root_bus(host, ops);
+	b = pci_create_root_bus(host, ops);
 	if (!b) {
 		pci_free_host_bridge(host);
 		return NULL;

@@ -2086,18 +2074,19 @@ struct pci_bus *pci_scan_bus_legacy(u32 db, struct pci_ops *ops,
 					void *sysdata)
 {
 	LIST_HEAD(resources);
-	struct pci_bus *b;
+	struct pci_host_bridge *host;
 
 	pci_add_resource(&resources, &ioport_resource);
 	pci_add_resource(&resources, &iomem_resource);
 	pci_add_resource(&resources, &busn_resource);
-	b = pci_create_root_bus(NULL, db, ops, sysdata, &resources);
-	if (b) {
-		pci_scan_child_bus(b);
+	host = pci_create_host_bridge(NULL, db, sysdata, &resources, NULL);
+	if (host) {
+		__pci_scan_root_bus(host, ops);
+		return host->bus;
 	} else {
 		pci_free_resource_list(&resources);
 	}
-	return b;
+	return NULL;
 }
 EXPORT_SYMBOL(pci_scan_bus_legacy);
 

@@ -781,9 +781,6 @@ void pcibios_scan_specific_bus(int busn);
 struct pci_bus *pci_find_bus(int domain, int busnr);
 void pci_bus_add_devices(const struct pci_bus *bus);
 struct pci_bus *pci_scan_bus_legacy(u32 dombus, struct pci_ops *ops, void *sysdata);
-struct pci_bus *pci_create_root_bus(struct device *parent, u32 dombus,
-				    struct pci_ops *ops, void *sysdata,
-				    struct list_head *resources);
 void pci_free_host_bridge(struct pci_host_bridge *host);
 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax);
 int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax);

@@ -750,21 +750,6 @@ static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
 	return 1;
 }
 
-static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys)
-{
-	struct mvebu_pcie *pcie = sys_to_pcie(sys);
-	struct pci_bus *bus;
-
-	bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr,
-				  &mvebu_pcie_ops, sys, &sys->resources);
-	if (!bus)
-		return NULL;
-
-	pci_scan_child_bus(bus);
-
-	return bus;
-}
-
 static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
 						 const struct resource *res,
 						 resource_size_t start,

@@ -808,12 +793,11 @@ static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
 	hw.nr_controllers = 1;
 	hw.private_data   = (void **)&pcie;
 	hw.setup          = mvebu_pcie_setup;
-	hw.scan           = mvebu_pcie_scan_bus;
 	hw.map_irq        = of_irq_parse_and_map_pci;
 	hw.ops            = &mvebu_pcie_ops;
 	hw.align_resource = mvebu_pcie_align_resource;
 
-	pci_common_init(&hw);
+	pci_common_init_dev(&pcie->pdev->dev, &hw);
 }
 
 /*

@@ -630,21 +630,6 @@ static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
 	return irq;
 }
 
-static struct pci_bus *tegra_pcie_scan_bus(int nr, struct pci_sys_data *sys)
-{
-	struct tegra_pcie *pcie = sys_to_pcie(sys);
-	struct pci_bus *bus;
-
-	bus = pci_create_root_bus(pcie->dev, sys->busnr, &tegra_pcie_ops, sys,
-				  &sys->resources);
-	if (!bus)
-		return NULL;
-
-	pci_scan_child_bus(bus);
-
-	return bus;
-}
-
 static irqreturn_t tegra_pcie_isr(int irq, void *arg)
 {
 	const char *err_msg[] = {

@@ -1831,7 +1816,6 @@ static int tegra_pcie_enable(struct tegra_pcie *pcie)
 	hw.private_data = (void **)&pcie;
 	hw.setup = tegra_pcie_setup;
 	hw.map_irq = tegra_pcie_map_irq;
-	hw.scan = tegra_pcie_scan_bus;
 	hw.ops = &tegra_pcie_ops;
 
 	pci_common_init_dev(pcie->dev, &hw);

@@ -336,8 +336,9 @@ common_init_pci(void)
 		pci_add_resource_offset(&resources, hose->mem_space,
 					hose->mem_space->start);
 
-		bus = pci_scan_root_bus(NULL, next_busno, alpha_mv.pci_ops,
-					hose, &resources);
+		bus = pci_scan_root_bus(NULL, 
+				PCI_DOMBUS(hose->index, next_busno), alpha_mv.pci_ops,
+				hose, &resources);
 		if (bus)
 			pci_bus_add_devices(bus);
 		hose->bus = bus;

@@ -206,7 +206,8 @@ nautilus_init_pci(void)
 	unsigned long memtop = max_low_pfn << PAGE_SHIFT;
 
 	/* Scan our single hose.  */
-	bus = pci_scan_bus_legacy(0, alpha_mv.pci_ops, hose);
+	bus = pci_scan_bus_legacy(PCI_DOMBUS(hose->index, 0), 
+			alpha_mv.pci_ops, hose);
 	hose->bus = bus;
 	pcibios_claim_one_bus(bus);
 

@@ -465,8 +465,8 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 	 * should handle the case here, but it appears that IA64 hasn't
 	 * such quirk. So we just ignore the case now.
 	 */
-	pbus = pci_create_root_bus(NULL, bus, &pci_root_ops, controller,
-				   &info->resources);
+	pbus = pci_create_root_bus(NULL, PCI_DOMBUS(domain, bus), 
+			&pci_root_ops, controller, &info->resources);
 	if (!pbus) {
 		pci_free_resource_list(&info->resources);
 		__release_pci_root_info(info);