ACPI based root bridge hot-add

diff -puN arch/i386/pci/common.c~pci_serparate_device_add arch/i386/pci/common.c
@@ -133,7 +133,7 @@ struct pci_bus * __devinit pcibios_scan_
 
 	printk("PCI: Probing PCI hardware (bus %02x)\n", busnum);
 
-	return pci_scan_bus(busnum, &pci_root_ops, NULL);
+	return pci_scan_bus_parented(NULL, busnum, &pci_root_ops, NULL);
 }
 
 extern u8 pci_cache_line_size;

diff -puN arch/i386/pci/legacy.c~pci_serparate_device_add arch/i386/pci/legacy.c
@@ -45,6 +45,8 @@ static int __init pci_legacy_init(void)
 
 	printk("PCI: Probing PCI hardware\n");
 	pci_root_bus = pcibios_scan_root(0);
+	if (pci_root_bus)
+		pci_bus_add_devices(pci_root_bus);
 
 	pcibios_fixup_peer_bridges();
 

diff -puN arch/i386/pci/numa.c~pci_serparate_device_add arch/i386/pci/numa.c
@@ -115,6 +115,8 @@ static int __init pci_numa_init(void)
 		return 0;
 
 	pci_root_bus = pcibios_scan_root(0);
+	if (pci_root_bus)
+		pci_bus_add_devices(pci_root_bus);
 	if (num_online_nodes() > 1)
 		for_each_online_node(quad) {
 			if (quad = 0)

diff -puN arch/ia64/pci/pci.c~pci_serparate_device_add arch/ia64/pci/pci.c
@@ -330,7 +330,7 @@ pci_acpi_scan_root(struct acpi_device *d
 	acpi_walk_resources(device->handle, METHOD_NAME__CRS, add_window,
 			&info);
 
-	pbus = pci_scan_bus(bus, &pci_root_ops, controller);
+	pbus = pci_scan_bus_parented(NULL, bus, &pci_root_ops, controller);
 	if (pbus)
 		pcibios_setup_root_windows(pbus, controller);
 

diff -puN drivers/acpi/pci_bind.c~pci_serparate_device_add drivers/acpi/pci_bind.c
@@ -129,6 +129,8 @@ acpi_pci_bind (
 	char			*pathname = NULL;
 	struct acpi_buffer	buffer = {0, NULL};
 	acpi_handle		handle = NULL;
+	struct pci_dev		*dev;
+	struct pci_bus 		*bus;
 
 	ACPI_FUNCTION_TRACE("acpi_pci_bind");
 

@@ -193,8 +195,20 @@ acpi_pci_bind (
 	 * Locate matching device in PCI namespace.  If it doesn't exist
 	 * this typically means that the device isn't currently inserted
 	 * (e.g. docking station, port replicator, etc.).
+	 * We cannot simply search the global pci device list, since
+	 * PCI devices are added to the global pci list when the root
+	 * bridge start ops are run, which may not have happened yet.
 	 */
-	data->dev = pci_find_slot(data->id.bus, PCI_DEVFN(data->id.device, data->id.function));
+	bus = pci_find_bus(data->id.segment, data->id.bus);
+	if (bus) {
+		list_for_each_entry(dev, &bus->devices, bus_list) {
+			if (dev->devfn = PCI_DEVFN(data->id.device,
+						data->id.function)) {
+				data->dev = dev;
+				break;
+			}
+		}
+	}
 	if (!data->dev) {
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, 
 			"Device %02x:%02x:%02x.%02x not present in PCI namespace\n",

diff -puN drivers/acpi/pci_root.c~pci_serparate_device_add drivers/acpi/pci_root.c
@@ -46,6 +46,7 @@ ACPI_MODULE_NAME		("pci_root")
 
 static int acpi_pci_root_add (struct acpi_device *device);
 static int acpi_pci_root_remove (struct acpi_device *device, int type);
+static int acpi_pci_root_start (struct acpi_device *device);
 
 static struct acpi_driver acpi_pci_root_driver = {
 	.name =		ACPI_PCI_ROOT_DRIVER_NAME,

@@ -54,6 +55,7 @@ static struct acpi_driver acpi_pci_root_
 	.ops =		{
 				.add =    acpi_pci_root_add,
 				.remove = acpi_pci_root_remove,
+				.start =  acpi_pci_root_start,
 			},
 };
 

@@ -169,6 +171,7 @@ acpi_pci_root_add (
 	if (!root)
 		return_VALUE(-ENOMEM);
 	memset(root, 0, sizeof(struct acpi_pci_root));
+	INIT_LIST_HEAD(&root->node);
 
 	root->handle = device->handle;
 	strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);

@@ -298,12 +301,31 @@ acpi_pci_root_add (
 			root->id.bus);
 
 end:
-	if (result)
+	if (result) {
+		if (!list_empty(&root->node))
+			list_del(&root->node);
 		kfree(root);
+	}
 
 	return_VALUE(result);
 }
 
+static int
+acpi_pci_root_start (
+	struct acpi_device	*device)
+{
+	struct acpi_pci_root	*root;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_root_start");
+
+	list_for_each_entry(root, &acpi_pci_roots, node) {
+		if (root->handle = device->handle) {
+			pci_bus_add_devices(root->bus);
+			return_VALUE(0);
+		}
+	}
+	return_VALUE(-ENODEV);
+}
 
 static int
 acpi_pci_root_remove (

diff -puN drivers/parisc/dino.c~pci_serparate_device_add drivers/parisc/dino.c
@@ -993,6 +993,7 @@ dino_driver_callback(struct parisc_devic
 	bus = pci_scan_bus_parented(&dev->dev, dino_current_bus,
 				    &dino_cfg_ops, NULL);
 	if(bus) {
+		pci_bus_add_devices(bus);
 		/* This code *depends* on scanning being single threaded
 		 * if it isn't, this global bus number count will fail
 		 */

diff -puN drivers/parisc/lba_pci.c~pci_serparate_device_add drivers/parisc/lba_pci.c
@@ -1570,6 +1570,8 @@ lba_driver_probe(struct parisc_device *d
 	lba_bus = lba_dev->hba.hba_bus  		pci_scan_bus_parented(&dev->dev, lba_dev->hba.bus_num.start,
 				cfg_ops, NULL);
+	if (lba_bus)
+		pci_bus_add_devices(lba_bus);
 
 	/* This is in lieu of calling pci_assign_unassigned_resources() */
 	if (is_pdc_pat()) {

diff -puN drivers/pci/probe.c~pci_serparate_device_add drivers/pci/probe.c
@@ -916,8 +916,6 @@ struct pci_bus * __devinit pci_scan_bus_
 
 	b->subordinate = pci_scan_child_bus(b);
 
-	pci_bus_add_devices(b);
-
 	return b;
 
 sys_create_link_err:

diff -puN include/linux/pci.h~pci_serparate_device_add include/linux/pci.h
@@ -732,16 +732,20 @@ void pcibios_update_irq(struct pci_dev *
 /* Generic PCI functions used internally */
 
 extern struct pci_bus *pci_find_bus(int domain, int busnr);
+void pci_bus_add_devices(struct pci_bus *bus);
 struct pci_bus *pci_scan_bus_parented(struct device *parent, int bus, struct pci_ops *ops, void *sysdata);
 static inline struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata)
 {
-	return pci_scan_bus_parented(NULL, bus, ops, sysdata);
+	struct pci_bus *root_bus;
+	root_bus = pci_scan_bus_parented(NULL, bus, ops, sysdata);
+	if (root_bus)
+		pci_bus_add_devices(root_bus);
+	return root_bus;
 }
 int pci_scan_slot(struct pci_bus *bus, int devfn);
 struct pci_dev * pci_scan_single_device(struct pci_bus *bus, int devfn);
 unsigned int pci_scan_child_bus(struct pci_bus *bus);
 void pci_bus_add_device(struct pci_dev *dev);
-void pci_bus_add_devices(struct pci_bus *bus);
 void pci_name_device(struct pci_dev *dev);
 char *pci_class_name(u32 class);
 void pci_read_bridge_bases(struct pci_bus *child);

diff -puN arch/ia64/pci/pci.c~fix-ia64-pcibios_enable_resources arch/ia64/pci/pci.c
@@ -436,18 +436,24 @@ pcibios_enable_resources (struct pci_dev
 	u16 cmd, old_cmd;
 	int idx;
 	struct resource *r;
+	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
 
 	if (!dev)
 		return -EINVAL;
 
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	old_cmd = cmd;
-	for (idx=0; idx<6; idx++) {
+	for (idx=0; idx<PCI_NUM_RESOURCES; idx++) {
 		/* Only set up the desired resources.  */
 		if (!(mask & (1 << idx)))
 			continue;
 
 		r = &dev->resource[idx];
+		if (!(r->flags & type_mask))
+			continue;
+		if ((idx == PCI_ROM_RESOURCE) &&
+				(!(r->flags & IORESOURCE_ROM_ENABLE)))
+			continue;
 		if (!r->start && r->end) {
 			printk(KERN_ERR
 			       "PCI: Device %s not available because of resource collisions\n",

@@ -459,8 +465,6 @@ pcibios_enable_resources (struct pci_dev
 		if (r->flags & IORESOURCE_MEM)
 			cmd |= PCI_COMMAND_MEMORY;
 	}
-	if (dev->resource[PCI_ROM_RESOURCE].start)
-		cmd |= PCI_COMMAND_MEMORY;
 	if (cmd != old_cmd) {
 		printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
 		pci_write_config_word(dev, PCI_COMMAND, cmd);

diff -puN arch/ia64/pci/pci.c~ia64-pcibios_fixup_bus-hotplug-safe arch/ia64/pci/pci.c
@@ -391,6 +391,25 @@ void pcibios_bus_to_resource(struct pci_
 	res->end = region->end + offset;
 }
 
+static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
+{
+	unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
+	struct resource *devr = &dev->resource[idx];
+
+	if (!dev->bus)
+		return 0;
+	for (i=0; i<PCI_BUS_NUM_RESOURCES; i++) {
+		struct resource *busr = dev->bus->resource[i];
+
+		if (!busr || ((busr->flags ^ devr->flags) & type_mask))
+			continue;
+		if ((devr->start) && (devr->start >= busr->start) &&
+				(devr->end <= busr->end))
+			return 1;
+	}
+	return 0;
+}
+
 static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
 {
 	struct pci_bus_region region;

@@ -404,7 +423,8 @@ static void __devinit pcibios_fixup_devi
 		region.start = dev->resource[i].start;
 		region.end = dev->resource[i].end;
 		pcibios_bus_to_resource(dev, &dev->resource[i], &region);
-		pci_claim_resource(dev, i);
+		if ((is_valid_resource(dev, i)))
+			pci_claim_resource(dev, i);
 	}
 }
 

diff -puN drivers/pci/probe.c~prevent_duplicate_busnr drivers/pci/probe.c
@@ -417,7 +417,7 @@ int __devinit pci_scan_bridge(struct pci
 {
 	struct pci_bus *child;
 	int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
-	u32 buses;
+	u32 buses, i;
 	u16 bctl;
 
 	pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);

@@ -476,6 +476,10 @@ int __devinit pci_scan_bridge(struct pci
 		/* Clear errors */
 		pci_write_config_word(dev, PCI_STATUS, 0xffff);
 
+		/* Prevent assigning a bus number that already exists.
+		 * This can happen when a bridge is hot-plugged */
+		if (pci_find_bus(pci_domain_nr(bus), max+1))
+			return max;
 		child = pci_alloc_child_bus(bus, dev, ++max);
 		buses = (buses & 0xff000000)
 		      | ((unsigned int)(child->primary)     <<  0)

@@ -507,7 +511,11 @@ int __devinit pci_scan_bridge(struct pci
 			 * as cards with a PCI-to-PCI bridge can be
 			 * inserted later.
 			 */
-			max += CARDBUS_RESERVE_BUSNR;
+			for (i=0; i<CARDBUS_RESERVE_BUSNR; i++)
+				if (pci_find_bus(pci_domain_nr(bus),
+							max+i+1))
+					break;
+			max += i;
 		}
 		/*
 		 * Set the subordinate bus number to its real value.

diff -puN drivers/pci/probe.c~lock-pci-root-bus-add drivers/pci/probe.c
@@ -8,6 +8,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/cpumask.h>
+#include "pci.h"
 
 #undef DEBUG
 

@@ -380,8 +381,11 @@ struct pci_bus * __devinit pci_add_new_b
 	struct pci_bus *child;
 
 	child = pci_alloc_child_bus(parent, dev, busnr);
-	if (child)
+	if (child) {
+		spin_lock(&pci_bus_lock);
 		list_add_tail(&child->node, &parent->children);
+		spin_unlock(&pci_bus_lock);
+	}
 	return child;
 }
 

@@ -771,7 +775,9 @@ pci_scan_single_device(struct pci_bus *b
 	 * and the bus list for fixup functions, etc.
 	 */
 	INIT_LIST_HEAD(&dev->global_list);
+	spin_lock(&pci_bus_lock);
 	list_add_tail(&dev->bus_list, &bus->devices);
+	spin_unlock(&pci_bus_lock);
 
 	return dev;
 }

@@ -891,7 +897,9 @@ struct pci_bus * __devinit pci_scan_bus_
 		DBG("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
 		goto err_out;
 	}
+	spin_lock(&pci_bus_lock);
 	list_add_tail(&b->node, &pci_root_buses);
+	spin_unlock(&pci_bus_lock);
 
 	memset(dev, 0, sizeof(*dev));
 	dev->parent = parent;

@@ -933,7 +941,9 @@ class_dev_create_file_err:
 class_dev_reg_err:
 	device_unregister(dev);
 dev_reg_err:
+	spin_lock(&pci_bus_lock);
 	list_del(&b->node);
+	spin_unlock(&pci_bus_lock);
 err_out:
 	kfree(dev);
 	kfree(b);

diff -puN drivers/pci/probe.c~pci_link_child_bus drivers/pci/probe.c
@@ -457,7 +457,7 @@ int __devinit pci_scan_bridge(struct pci
 			return max;
 		}
 
-		child = pci_alloc_child_bus(bus, dev, busnr);
+		child = pci_add_new_bus(bus, dev, busnr);
 		if (!child)
 			return max;
 		child->primary = buses & 0xFF;

@@ -484,7 +484,7 @@ int __devinit pci_scan_bridge(struct pci
 		 * This can happen when a bridge is hot-plugged */
 		if (pci_find_bus(pci_domain_nr(bus), max+1))
 			return max;
-		child = pci_alloc_child_bus(bus, dev, ++max);
+		child = pci_add_new_bus(bus, dev, ++max);
 		buses = (buses & 0xff000000)
 		      | ((unsigned int)(child->primary)     <<  0)
 		      | ((unsigned int)(child->secondary)   <<  8)

diff -puN drivers/pci/bus.c~pci_link_child_bus drivers/pci/bus.c
@@ -121,10 +121,13 @@ void __devinit pci_bus_add_devices(struc
 		 * If there is an unattached subordinate bus, attach
 		 * it and then scan for unattached PCI devices.
 		 */
-		if (dev->subordinate && list_empty(&dev->subordinate->node)) {
-			spin_lock(&pci_bus_lock);
-			list_add_tail(&dev->subordinate->node, &dev->bus->children);
-			spin_unlock(&pci_bus_lock);
+		if (dev->subordinate) {
+		       if (list_empty(&dev->subordinate->node)) {
+			       spin_lock(&pci_bus_lock);
+			       list_add_tail(&dev->subordinate->node,
+					       &dev->bus->children);
+			       spin_unlock(&pci_bus_lock);
+		       }
 			pci_bus_add_devices(dev->subordinate);
 
 			sysfs_create_link(&dev->subordinate->class_dev.kobj, &dev->dev.kobj, "bridge");

diff -puN drivers/pci/remove.c~pci-remove-device-hotplug-safe drivers/pci/remove.c
@@ -26,17 +26,21 @@ static void pci_free_resources(struct pc
 
 static void pci_destroy_dev(struct pci_dev *dev)
 {
-	pci_proc_detach_device(dev);
-	pci_remove_sysfs_dev_files(dev);
-	device_unregister(&dev->dev);
+	if (!list_empty(&dev->global_list)) {
+		pci_proc_detach_device(dev);
+		pci_remove_sysfs_dev_files(dev);
+		device_unregister(&dev->dev);
+		spin_lock(&pci_bus_lock);
+		list_del(&dev->global_list);
+		dev->global_list.next = dev->global_list.prev = NULL;
+		spin_unlock(&pci_bus_lock);
+	}
 
 	/* Remove the device from the device lists, and prevent any further
 	 * list accesses from this device */
 	spin_lock(&pci_bus_lock);
 	list_del(&dev->bus_list);
-	list_del(&dev->global_list);
 	dev->bus_list.next = dev->bus_list.prev = NULL;
-	dev->global_list.next = dev->global_list.prev = NULL;
 	spin_unlock(&pci_bus_lock);
 
 	pci_free_resources(dev);

diff -puN drivers/pci/setup-bus.c~discard_no_resource_devs drivers/pci/setup-bus.c
@@ -72,7 +72,10 @@ pbus_assign_resources_sorted(struct pci_
 	for (list = head.next; list;) {
 		res = list->res;
 		idx = res - &list->dev->resource[0];
-		pci_assign_resource(list->dev, idx);
+		if (pci_assign_resource(list->dev, idx)) {
+			res->start = 0;
+			res->flags = 0;
+		}
 		tmp = list;
 		list = list->next;
 		kfree(tmp);

diff -puN arch/ia64/pci/pci.c~ia64-read_bridge_bases arch/ia64/pci/pci.c
@@ -436,6 +436,10 @@ pcibios_fixup_bus (struct pci_bus *b)
 {
 	struct pci_dev *dev;
 
+	if (b->self) {
+		pci_read_bridge_bases(b);
+		pcibios_fixup_device_resources(b->self);
+	}
 	list_for_each_entry(dev, &b->devices, bus_list)
 		pcibios_fixup_device_resources(dev);
 

diff -puN drivers/acpi/scan.c~acpi_separate_device_start drivers/acpi/scan.c
@@ -553,20 +553,29 @@ acpi_bus_driver_init (
 	 * upon possible configuration and currently allocated resources.
 	 */
 
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Driver successfully bound to device\n"));
+	return_VALUE(0);
+}
+
+int
+acpi_start_single_object (
+		struct acpi_device *device)
+{
+	int result = 0;
+	struct acpi_driver *driver;
+
+	ACPI_FUNCTION_TRACE("acpi_start_single_object");
+
+	if (!(driver = device->driver))
+		return_VALUE(0);
+
 	if (driver->ops.start) {
 		result = driver->ops.start(device);
 		if (result && driver->ops.remove)
 			driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
-		return_VALUE(result);
-	}
-
-	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Driver successfully bound to device\n"));
-
-	if (driver->ops.scan) {
-		driver->ops.scan(device);
 	}
 
-	return_VALUE(0);
+	return_VALUE(result);
 }
 
 static int acpi_driver_attach(struct acpi_driver * drv)

@@ -586,6 +595,7 @@ static int acpi_driver_attach(struct acp
 
 		if (!acpi_bus_match(dev, drv)) {
 			if (!acpi_bus_driver_init(dev, drv)) {
+				acpi_start_single_object(dev);
 				atomic_inc(&drv->references);
 				count++;
 				ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",

@@ -1009,8 +1019,8 @@ acpi_bus_remove (
 }
 
 
-int
-acpi_bus_add (
+static int
+acpi_add_single_object (
 	struct acpi_device	**child,
 	struct acpi_device	*parent,
 	acpi_handle		handle,

@@ -1019,7 +1029,7 @@ acpi_bus_add (
 	int			result = 0;
 	struct acpi_device	*device = NULL;
 
-	ACPI_FUNCTION_TRACE("acpi_bus_add");
+	ACPI_FUNCTION_TRACE("acpi_add_single_object");
 
 	if (!child)
 		return_VALUE(-EINVAL);

@@ -1140,7 +1150,7 @@ acpi_bus_add (
 	 *
 	 * TBD: Assumes LDM provides driver hot-plug capability.
 	 */
-	acpi_bus_find_driver(device);
+	result = acpi_bus_find_driver(device);
 
 end:
 	if (!result)

@@ -1153,10 +1163,10 @@ end:
 
 	return_VALUE(result);
 }
-EXPORT_SYMBOL(acpi_bus_add);
 
 
-int acpi_bus_scan (struct acpi_device	*start)
+static int acpi_bus_scan (struct acpi_device	*start,
+		struct acpi_bus_ops *ops)
 {
 	acpi_status		status = AE_OK;
 	struct acpi_device	*parent = NULL;

@@ -1229,9 +1239,20 @@ int acpi_bus_scan (struct acpi_device	*s
 			continue;
 		}
 
-		status = acpi_bus_add(&child, parent, chandle, type);
-		if (ACPI_FAILURE(status))
-			continue;
+		if (ops->acpi_op_add)
+			status = acpi_add_single_object(&child, parent,
+					chandle, type);
+		 else
+			status = acpi_bus_get_device(chandle, &child);
+
+		 if (ACPI_FAILURE(status))
+			 continue;
+
+		if (ops->acpi_op_start) {
+			status = acpi_start_single_object(child);
+			if (ACPI_FAILURE(status))
+				continue;
+		}
 
 		/*
 		 * If the device is present, enabled, and functioning then

@@ -1257,8 +1278,50 @@ int acpi_bus_scan (struct acpi_device	*s
 
 	return_VALUE(0);
 }
-EXPORT_SYMBOL(acpi_bus_scan);
 
+int
+acpi_bus_add (
+	struct acpi_device	**child,
+	struct acpi_device	*parent,
+	acpi_handle		handle,
+	int			type)
+{
+	int result;
+	struct acpi_bus_ops ops;
+
+	ACPI_FUNCTION_TRACE("acpi_bus_add");
+
+	result = acpi_add_single_object(child, parent, handle, type);
+	if (!result) {
+		memset(&ops, 0, sizeof(ops));
+		ops.acpi_op_add = 1;
+		result = acpi_bus_scan(*child, &ops);
+	}
+	return_VALUE(result);
+}
+EXPORT_SYMBOL(acpi_bus_add);
+
+int
+acpi_bus_start (
+	struct acpi_device *device)
+{
+	int result;
+	struct acpi_bus_ops ops;
+
+	ACPI_FUNCTION_TRACE("acpi_bus_start");
+
+	if (!device)
+		return_VALUE(-EINVAL);
+
+	result = acpi_start_single_object(device);
+	if (!result) {
+		memset(&ops, 0, sizeof(ops));
+		ops.acpi_op_start = 1;
+		result = acpi_bus_scan(device, &ops);
+	}
+	return_VALUE(result);
+}
+EXPORT_SYMBOL(acpi_bus_start);
 
 static int
 acpi_bus_trim(struct acpi_device	*start,

@@ -1331,13 +1394,19 @@ acpi_bus_scan_fixed (
 	/*
 	 * Enumerate all fixed-feature devices.
 	 */
-	if (acpi_fadt.pwr_button == 0)
-		result = acpi_bus_add(&device, acpi_root, 
+	if (acpi_fadt.pwr_button == 0) {
+		result = acpi_add_single_object(&device, acpi_root,
 			NULL, ACPI_BUS_TYPE_POWER_BUTTON);
+		if (!result)
+			result = acpi_start_single_object(device);
+	}
 
-	if (acpi_fadt.sleep_button == 0)
-		result = acpi_bus_add(&device, acpi_root, 
+	if (acpi_fadt.sleep_button == 0) {
+		result = acpi_add_single_object(&device, acpi_root,
 			NULL, ACPI_BUS_TYPE_SLEEP_BUTTON);
+		if (!result)
+			result = acpi_start_single_object(device);
+	}
 
 	return_VALUE(result);
 }

@@ -1346,6 +1415,7 @@ acpi_bus_scan_fixed (
 static int __init acpi_scan_init(void)
 {
 	int result;
+	struct acpi_bus_ops ops;
 
 	ACPI_FUNCTION_TRACE("acpi_scan_init");
 

@@ -1357,17 +1427,23 @@ static int __init acpi_scan_init(void)
 	/*
 	 * Create the root device in the bus's device tree
 	 */
-	result = acpi_bus_add(&acpi_root, NULL, ACPI_ROOT_OBJECT, 
+	result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
 		ACPI_BUS_TYPE_SYSTEM);
 	if (result)
 		goto Done;
 
+	result = acpi_start_single_object(acpi_root);
+
 	/*
 	 * Enumerate devices in the ACPI namespace.
 	 */
 	result = acpi_bus_scan_fixed(acpi_root);
-	if (!result) 
-		result = acpi_bus_scan(acpi_root);
+	if (!result) {
+		memset(&ops, 0, sizeof(ops));
+		ops.acpi_op_add = 1;
+		ops.acpi_op_start = 1;
+		result = acpi_bus_scan(acpi_root, &ops);
+	}
 
 	if (result)
 		acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);

diff -puN include/acpi/acpi_bus.h~acpi_separate_device_start include/acpi/acpi_bus.h
@@ -108,6 +108,21 @@ typedef int (*acpi_op_unbind)	(struct ac
 typedef int (*acpi_op_match)	(struct acpi_device *device,
 				 struct acpi_driver *driver);
 
+struct acpi_bus_ops {
+	u32 			acpi_op_add:1;
+	u32			acpi_op_remove:1;
+	u32			acpi_op_lock:1;
+	u32			acpi_op_start:1;
+	u32			acpi_op_stop:1;
+	u32			acpi_op_suspend:1;
+	u32			acpi_op_resume:1;
+	u32			acpi_op_scan:1;
+	u32			acpi_op_bind:1;
+	u32			acpi_op_unbind:1;
+	u32			acpi_op_match:1;
+	u32			reserved:21;
+};
+
 struct acpi_device_ops {
 	acpi_op_add		add;
 	acpi_op_remove		remove;

@@ -327,9 +342,9 @@ int acpi_bus_generate_event (struct acpi
 int acpi_bus_receive_event (struct acpi_bus_event *event);
 int acpi_bus_register_driver (struct acpi_driver *driver);
 int acpi_bus_unregister_driver (struct acpi_driver *driver);
-int acpi_bus_scan (struct acpi_device *start);
 int acpi_bus_add (struct acpi_device **child, struct acpi_device *parent,
 		acpi_handle handle, int type);
+int acpi_bus_start (struct acpi_device *device);
 
 
 int acpi_match_ids (struct acpi_device	*device, char	*ids);

diff -puN drivers/acpi/container.c~acpi_separate_device_start drivers/acpi/container.c
@@ -153,7 +153,7 @@ container_device_add(struct acpi_device 
 		return_VALUE(-ENODEV);
 	}
 
-	result = acpi_bus_scan(*device);
+	result = acpi_bus_start(*device);
 
 	return_VALUE(result);
 }

diff -puN drivers/acpi/processor_core.c~acpi_separate_device_start drivers/acpi/processor_core.c
@@ -723,7 +723,7 @@ int acpi_processor_device_add(
 		return_VALUE(-ENODEV);
 	}
 
-	acpi_bus_scan(*device);
+	acpi_bus_start(*device);
 
 	pr = acpi_driver_data(*device);
 	if (!pr)

diff -puN drivers/acpi/pci_bind.c~acpi-get-pci-id drivers/acpi/pci_bind.c
@@ -61,15 +61,14 @@ acpi_pci_data_handler (
 
 
 /**
- * acpi_os_get_pci_id
+ * acpi_get_pci_id
  * ------------------
  * This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
  * to resolve PCI information for ACPI-PCI devices defined in the namespace.
  * This typically occurs when resolving PCI operation region information.
  */
-#ifdef ACPI_FUTURE_USAGE
 acpi_status
-acpi_os_get_pci_id (
+acpi_get_pci_id (
 	acpi_handle		handle,
 	struct acpi_pci_id	*id)
 {

@@ -78,7 +77,7 @@ acpi_os_get_pci_id (
 	struct acpi_device	*device = NULL;
 	struct acpi_pci_data	*data = NULL;
 
-	ACPI_FUNCTION_TRACE("acpi_os_get_pci_id");
+	ACPI_FUNCTION_TRACE("acpi_get_pci_id");
 
 	if (!id)
 		return_ACPI_STATUS(AE_BAD_PARAMETER);

@@ -92,7 +91,7 @@ acpi_os_get_pci_id (
 	}
 
 	status = acpi_get_data(handle, acpi_pci_data_handler, (void**) &data);
-	if (ACPI_FAILURE(status) || !data || !data->dev) {
+	if (ACPI_FAILURE(status) || !data) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 
 			"Invalid ACPI-PCI context for device %s\n",
 			acpi_device_bid(device)));

@@ -115,7 +114,7 @@ acpi_os_get_pci_id (
 
 	return_ACPI_STATUS(AE_OK);
 }
-#endif  /*  ACPI_FUTURE_USAGE  */
+EXPORT_SYMBOL(acpi_get_pci_id);
 
 	
 int

diff -puN include/acpi/acpi_drivers.h~acpi-get-pci-id include/acpi/acpi_drivers.h
@@ -68,6 +68,7 @@ void acpi_pci_irq_del_prt (int segment, 
 
 struct pci_bus;
 
+acpi_status acpi_get_pci_id (acpi_handle handle, struct acpi_pci_id *id);
 int acpi_pci_bind (struct acpi_device *device);
 int acpi_pci_unbind (struct acpi_device *device);
 int acpi_pci_bind_root (struct acpi_device *device, struct acpi_pci_id *id, struct pci_bus *bus);

diff -puN drivers/pci/hotplug/acpiphp_glue.c~acpiphp_h2p_add drivers/pci/hotplug/acpiphp_glue.c
@@ -6,6 +6,8 @@
  * Copyright (C) 2002,2003 NEC Corporation
  * Copyright (C) 2003-2005 Matthew Wilcox ([email protected])
  * Copyright (C) 2003-2005 Hewlett Packard
+ * Copyright (C) 2005 Rajesh Shah ([email protected])
+ * Copyright (C) 2005 Intel Corporation
  *
  * All rights reserved.
  *

@@ -304,13 +306,15 @@ static void init_bridge_misc(struct acpi
 				     register_slot, bridge, NULL);
 
 	/* install notify handler */
-	status = acpi_install_notify_handler(bridge->handle,
+	if (bridge->type != BRIDGE_TYPE_HOST) {
+		status = acpi_install_notify_handler(bridge->handle,
 					     ACPI_SYSTEM_NOTIFY,
 					     handle_hotplug_event_bridge,
 					     bridge);
 
-	if (ACPI_FAILURE(status)) {
-		err("failed to register interrupt notify handler\n");
+		if (ACPI_FAILURE(status)) {
+			err("failed to register interrupt notify handler\n");
+		}
 	}
 
 	list_add(&bridge->list, &bridge_list);

@@ -802,6 +806,143 @@ static int acpiphp_check_bridge(struct a
 	return retval;
 }
 
+static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
+{
+	u16 pci_cmd, pci_bctl;
+	struct pci_dev *cdev;
+
+	/* Program hpp values for this device */
+	if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
+			(dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
+			(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
+		return;
+	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
+			bridge->hpp.cache_line_size);
+	pci_write_config_byte(dev, PCI_LATENCY_TIMER,
+			bridge->hpp.latency_timer);
+	pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
+	if (bridge->hpp.enable_SERR)
+		pci_cmd |= PCI_COMMAND_SERR;
+	else
+		pci_cmd &= ~PCI_COMMAND_SERR;
+	if (bridge->hpp.enable_PERR)
+		pci_cmd |= PCI_COMMAND_PARITY;
+	else
+		pci_cmd &= ~PCI_COMMAND_PARITY;
+	pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
+
+	/* Program bridge control value and child devices */
+	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
+		pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
+				bridge->hpp.latency_timer);
+		pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
+		if (bridge->hpp.enable_SERR)
+			pci_bctl |= PCI_BRIDGE_CTL_SERR;
+		else
+			pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
+		if (bridge->hpp.enable_PERR)
+			pci_bctl |= PCI_BRIDGE_CTL_PARITY;
+		else
+			pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
+		pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
+		if (dev->subordinate) {
+			list_for_each_entry(cdev, &dev->subordinate->devices,
+					bus_list)
+				program_hpp(cdev, bridge);
+		}
+	}
+}
+
+static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
+{
+	struct acpiphp_bridge bridge;
+	struct pci_dev *dev;
+
+	memset(&bridge, 0, sizeof(bridge));
+	bridge.handle = handle;
+	decode_hpp(&bridge);
+	list_for_each_entry(dev, &bus->devices, bus_list)
+		program_hpp(dev, &bridge);
+
+}
+
+/*
+ * Remove devices for which we could not assign resources, call
+ * arch specific code to fix-up the bus
+ */
+static void acpiphp_sanitize_bus(struct pci_bus *bus)
+{
+	struct pci_dev *dev;
+	int i;
+	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
+
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
+			struct resource *res = &dev->resource[i];
+			if ((res->flags & type_mask) && !res->start &&
+					res->end) {
+				/* Could not assign a required resources
+				 * for this device, remove it */
+				pci_remove_bus_device(dev);
+				break;
+			}
+		}
+	}
+}
+
+/* Program resources in newly inserted bridge */
+static int acpiphp_configure_bridge (acpi_handle handle)
+{
+	struct acpi_pci_id pci_id;
+	struct pci_bus *bus;
+
+	if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
+		err("cannot get PCI domain and bus number for bridge\n");
+		return -EINVAL;
+	}
+	bus = pci_find_bus(pci_id.segment, pci_id.bus);
+	if (!bus) {
+		err("cannot find bus %d:%d\n",
+				pci_id.segment, pci_id.bus);
+		return -EINVAL;
+	}
+
+	pci_bus_size_bridges(bus);
+	pci_bus_assign_resources(bus);
+	acpiphp_sanitize_bus(bus);
+	acpiphp_set_hpp_values(handle, bus);
+	pci_enable_bridges(bus);
+	return 0;
+}
+
+static void handle_bridge_insertion(acpi_handle handle, u32 type)
+{
+	struct acpi_device *device, *pdevice;
+	acpi_handle phandle;
+
+	if ((type != ACPI_NOTIFY_BUS_CHECK) &&
+			(type != ACPI_NOTIFY_DEVICE_CHECK)) {
+		err("unexpected notification type %d\n", type);
+		return;
+	}
+
+	acpi_get_parent(handle, &phandle);
+	if (acpi_bus_get_device(phandle, &pdevice)) {
+		dbg("no parent device, assuming NULL\n");
+		pdevice = NULL;
+	}
+	if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
+		err("cannot add bridge to acpi list\n");
+		return;
+	}
+	if (!acpiphp_configure_bridge(handle) &&
+		!acpi_bus_start(device))
+		add_bridge(handle);
+	else
+		err("cannot configure and start bridge\n");
+
+}
+
 /*
  * ACPI event handlers
  */

@@ -822,8 +963,19 @@ static void handle_hotplug_event_bridge(
 	char objname[64];
 	struct acpi_buffer buffer = { .length = sizeof(objname),
 				      .pointer = objname };
+	struct acpi_device *device;
 
-	bridge = (struct acpiphp_bridge *)context;
+	if (acpi_bus_get_device(handle, &device)) {
+		/* This bridge must have just been physically inserted */
+		handle_bridge_insertion(handle, type);
+		return;
+	}
+
+	bridge = acpiphp_handle_to_bridge(handle);
+	if (!bridge) {
+		err("cannot get bridge info\n");
+		return;
+	}
 
 	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
 

@@ -923,6 +1075,47 @@ static void handle_hotplug_event_func(ac
 	}
 }
 
+static int is_root_bridge(acpi_handle handle)
+{
+	acpi_status status;
+	struct acpi_device_info *info;
+	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+	int i;
+
+	status = acpi_get_object_info(handle, &buffer);
+	if (ACPI_SUCCESS(status)) {
+		info = buffer.pointer;
+		if ((info->valid & ACPI_VALID_HID) &&
+			!strcmp(PCI_ROOT_HID_STRING,
+					info->hardware_id.value)) {
+			acpi_os_free(buffer.pointer);
+			return 1;
+		}
+		if (info->valid & ACPI_VALID_CID) {
+			for (i=0; i < info->compatibility_id.count; i++) {
+				if (!strcmp(PCI_ROOT_HID_STRING,
+					info->compatibility_id.id[i].value)) {
+					acpi_os_free(buffer.pointer);
+					return 1;
+				}
+			}
+		}
+	}
+	return 0;
+}
+
+static acpi_status
+find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+	int *count = (int *)context;
+
+	if (is_root_bridge(handle)) {
+		acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+				handle_hotplug_event_bridge, NULL);
+			(*count)++;
+	}
+	return AE_OK ;
+}
 
 static struct acpi_pci_driver acpi_pci_hp_driver = {
 	.add =		add_bridge,

@@ -935,15 +1128,15 @@ static struct acpi_pci_driver acpi_pci_h
  */
 int __init acpiphp_glue_init(void)
 {
-	int num;
-
-	if (list_empty(&pci_root_buses))
-		return -1;
+	int num = 0;
 
-	num = acpi_pci_register_driver(&acpi_pci_hp_driver);
+	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+			ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
 
 	if (num <= 0)
 		return -1;
+	else
+		acpi_pci_register_driver(&acpi_pci_hp_driver);
 
 	return 0;
 }