Merge branch 'topic/yinghai-hostbridge-cleanup' into next

10 files changed, 304 insertions, 267 deletions

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index ed2835e148b5..8a17b23f8c84 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -9,11 +9,11 @@
 
 struct pci_root_info {
 	struct acpi_device *bridge;
-	char *name;
+	char name[16];
 	unsigned int res_num;
 	struct resource *res;
-	struct list_head *resources;
 	int busnum;
+	struct pci_sysdata sd;
 };
 
 static bool pci_use_crs = true;
@@ -287,7 +287,8 @@ static void coalesce_windows(struct pci_root_info *info, unsigned long type)
 	}
 }
 
-static void add_resources(struct pci_root_info *info)
+static void add_resources(struct pci_root_info *info,
+			  struct list_head *resources)
 {
 	int i;
 	struct resource *res, *root, *conflict;
@@ -311,53 +312,74 @@ static void add_resources(struct pci_root_info *info)
 				 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
 				 res, conflict->name, conflict);
 		else
-			pci_add_resource(info->resources, res);
+			pci_add_resource(resources, res);
 	}
 }
 
+static void free_pci_root_info_res(struct pci_root_info *info)
+{
+	kfree(info->res);
+	info->res = NULL;
+	info->res_num = 0;
+}
+
+static void __release_pci_root_info(struct pci_root_info *info)
+{
+	int i;
+	struct resource *res;
+
+	for (i = 0; i < info->res_num; i++) {
+		res = &info->res[i];
+
+		if (!res->parent)
+			continue;
+
+		if (!(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
+			continue;
+
+		release_resource(res);
+	}
+
+	free_pci_root_info_res(info);
+
+	kfree(info);
+}
+static void release_pci_root_info(struct pci_host_bridge *bridge)
+{
+	struct pci_root_info *info = bridge->release_data;
+
+	__release_pci_root_info(info);
+}
+
 static void
-get_current_resources(struct acpi_device *device, int busnum,
-		      int domain, struct list_head *resources)
+probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device,
+		    int busnum, int domain)
 {
-	struct pci_root_info info;
 	size_t size;
 
-	info.bridge = device;
-	info.res_num = 0;
-	info.resources = resources;
+	info->bridge = device;
+	info->res_num = 0;
 	acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
-				&info);
-	if (!info.res_num)
+				info);
+	if (!info->res_num)
 		return;
 
-	size = sizeof(*info.res) * info.res_num;
-	info.res = kmalloc(size, GFP_KERNEL);
-	if (!info.res)
+	size = sizeof(*info->res) * info->res_num;
+	info->res_num = 0;
+	info->res = kmalloc(size, GFP_KERNEL);
+	if (!info->res)
 		return;
 
-	info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum);
-	if (!info.name)
-		goto name_alloc_fail;
+	sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum);
 
-	info.res_num = 0;
 	acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
-				&info);
-
-	if (pci_use_crs) {
-		add_resources(&info);
-
-		return;
-	}
-
-	kfree(info.name);
-
-name_alloc_fail:
-	kfree(info.res);
+				info);
 }
 
 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
 {
 	struct acpi_device *device = root->device;
+	struct pci_root_info *info = NULL;
 	int domain = root->segment;
 	int busnum = root->secondary.start;
 	LIST_HEAD(resources);
@@ -389,17 +411,14 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
 	if (node != -1 && !node_online(node))
 		node = -1;
 
-	/* Allocate per-root-bus (not per bus) arch-specific data.
-	 * TODO: leak; this memory is never freed.
-	 * It's arguable whether it's worth the trouble to care.
-	 */
-	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
-	if (!sd) {
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (!info) {
 		printk(KERN_WARNING "pci_bus %04x:%02x: "
 		       "ignored (out of memory)\n", domain, busnum);
 		return NULL;
 	}
 
+	sd = &info->sd;
 	sd->domain = domain;
 	sd->node = node;
 	/*
@@ -413,22 +432,32 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
 		 * be replaced by sd.
 		 */
 		memcpy(bus->sysdata, sd, sizeof(*sd));
-		kfree(sd);
+		kfree(info);
 	} else {
-		get_current_resources(device, busnum, domain, &resources);
+		probe_pci_root_info(info, device, busnum, domain);
 
 		/*
 		 * _CRS with no apertures is normal, so only fall back to
 		 * defaults or native bridge info if we're ignoring _CRS.
 		 */
-		if (!pci_use_crs)
+		if (pci_use_crs)
+			add_resources(info, &resources);
+		else {
+			free_pci_root_info_res(info);
 			x86_pci_root_bus_resources(busnum, &resources);
+		}
+
 		bus = pci_create_root_bus(NULL, busnum, &pci_root_ops, sd,
 					  &resources);
-		if (bus)
+		if (bus) {
 			bus->subordinate = pci_scan_child_bus(bus);
-		else
+			pci_set_host_bridge_release(
+				to_pci_host_bridge(bus->bridge),
+				release_pci_root_info, info);
+		} else {
 			pci_free_resource_list(&resources);
+			__release_pci_root_info(info);
+		}
 	}
 
 	/* After the PCI-E bus has been walked and all devices discovered,
@@ -445,9 +474,6 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
 		}
 	}
 
-	if (!bus)
-		kfree(sd);
-
 	if (bus && node != -1) {
 #ifdef CONFIG_ACPI_NUMA
 		if (pxm >= 0)
diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c
index 0567df3890e1..459a7316375c 100644
--- a/arch/x86/pci/amd_bus.c
+++ b/arch/x86/pci/amd_bus.c
@@ -32,6 +32,18 @@ static struct pci_hostbridge_probe pci_probes[] __initdata = {
 
 #define RANGE_NUM 16
 
+static struct pci_root_info __init *find_pci_root_info(int node, int link)
+{
+	struct pci_root_info *info;
+
+	/* find the position */
+	list_for_each_entry(info, &pci_root_infos, list)
+		if (info->node == node && info->link == link)
+			return info;
+
+	return NULL;
+}
+
 /**
  * early_fill_mp_bus_to_node()
  * called before pcibios_scan_root and pci_scan_bus
@@ -50,7 +62,6 @@ static int __init early_fill_mp_bus_info(void)
 	int def_link;
 	struct pci_root_info *info;
 	u32 reg;
-	struct resource *res;
 	u64 start;
 	u64 end;
 	struct range range[RANGE_NUM];
@@ -86,7 +97,6 @@ static int __init early_fill_mp_bus_info(void)
 	if (!found)
 		return 0;
 
-	pci_root_num = 0;
 	for (i = 0; i < 4; i++) {
 		int min_bus;
 		int max_bus;
@@ -105,13 +115,8 @@ static int __init early_fill_mp_bus_info(void)
 #endif
 		link = (reg >> 8) & 0x03;
 
-		info = &pci_root_info[pci_root_num];
-		info->bus_min = min_bus;
-		info->bus_max = max_bus;
-		info->node = node;
-		info->link = link;
+		info = alloc_pci_root_info(min_bus, max_bus, node, link);
 		sprintf(info->name, "PCI Bus #%02x", min_bus);
-		pci_root_num++;
 	}
 
 	/* get the default node and link for left over res */
@@ -134,16 +139,10 @@ static int __init early_fill_mp_bus_info(void)
 		link = (reg >> 4) & 0x03;
 		end = (reg & 0xfff000) | 0xfff;
 
-		/* find the position */
-		for (j = 0; j < pci_root_num; j++) {
-			info = &pci_root_info[j];
-			if (info->node == node && info->link == link)
-				break;
-		}
-		if (j == pci_root_num)
+		info = find_pci_root_info(node, link);
+		if (!info)
 			continue; /* not found */
 
-		info = &pci_root_info[j];
 		printk(KERN_DEBUG "node %d link %d: io port [%llx, %llx]\n",
 		       node, link, start, end);
 
@@ -155,13 +154,8 @@ static int __init early_fill_mp_bus_info(void)
 	}
 	/* add left over io port range to def node/link, [0, 0xffff] */
 	/* find the position */
-	for (j = 0; j < pci_root_num; j++) {
-		info = &pci_root_info[j];
-		if (info->node == def_node && info->link == def_link)
-			break;
-	}
-	if (j < pci_root_num) {
-		info = &pci_root_info[j];
+	info = find_pci_root_info(def_node, def_link);
+	if (info) {
 		for (i = 0; i < RANGE_NUM; i++) {
 			if (!range[i].end)
 				continue;
@@ -214,16 +208,10 @@ static int __init early_fill_mp_bus_info(void)
 		end <<= 8;
 		end |= 0xffff;
 
-		/* find the position */
-		for (j = 0; j < pci_root_num; j++) {
-			info = &pci_root_info[j];
-			if (info->node == node && info->link == link)
-				break;
-		}
-		if (j == pci_root_num)
-			continue; /* not found */
+		info = find_pci_root_info(node, link);
 
-		info = &pci_root_info[j];
+		if (!info)
+			continue;
 
 		printk(KERN_DEBUG "node %d link %d: mmio [%llx, %llx]",
 		       node, link, start, end);
@@ -291,14 +279,8 @@ static int __init early_fill_mp_bus_info(void)
 	 * add left over mmio range to def node/link ?
 	 * that is tricky, just record range in from start_min to 4G
 	 */
-	for (j = 0; j < pci_root_num; j++) {
-		info = &pci_root_info[j];
-		if (info->node == def_node && info->link == def_link)
-			break;
-	}
-	if (j < pci_root_num) {
-		info = &pci_root_info[j];
-
+	info = find_pci_root_info(def_node, def_link);
+	if (info) {
 		for (i = 0; i < RANGE_NUM; i++) {
 			if (!range[i].end)
 				continue;
@@ -309,20 +291,16 @@ static int __init early_fill_mp_bus_info(void)
 		}
 	}
 
-	for (i = 0; i < pci_root_num; i++) {
-		int res_num;
+	list_for_each_entry(info, &pci_root_infos, list) {
 		int busnum;
+		struct pci_root_res *root_res;
 
-		info = &pci_root_info[i];
-		res_num = info->res_num;
 		busnum = info->bus_min;
 		printk(KERN_DEBUG "bus: [%02x, %02x] on node %x link %x\n",
 		       info->bus_min, info->bus_max, info->node, info->link);
-		for (j = 0; j < res_num; j++) {
-			res = &info->res[j];
-			printk(KERN_DEBUG "bus: %02x index %x %pR\n",
-				       busnum, j, res);
-		}
+		list_for_each_entry(root_res, &info->resources, list)
+			printk(KERN_DEBUG "bus: %02x %pR\n",
+				       busnum, &root_res->res);
 	}
 
 	return 0;
diff --git a/arch/x86/pci/broadcom_bus.c b/arch/x86/pci/broadcom_bus.c
index f3a7c569a403..614392ced7d6 100644
--- a/arch/x86/pci/broadcom_bus.c
+++ b/arch/x86/pci/broadcom_bus.c
@@ -22,19 +22,15 @@
 static void __init cnb20le_res(u8 bus, u8 slot, u8 func)
 {
 	struct pci_root_info *info;
+	struct pci_root_res *root_res;
 	struct resource res;
 	u16 word1, word2;
 	u8 fbus, lbus;
-	int i;
-
-	info = &pci_root_info[pci_root_num];
-	pci_root_num++;
 
 	/* read the PCI bus numbers */
 	fbus = read_pci_config_byte(bus, slot, func, 0x44);
 	lbus = read_pci_config_byte(bus, slot, func, 0x45);
-	info->bus_min = fbus;
-	info->bus_max = lbus;
+	info = alloc_pci_root_info(fbus, lbus, 0, 0);
 
 	/*
 	 * Add the legacy IDE ports on bus 0
@@ -86,8 +82,8 @@ static void __init cnb20le_res(u8 bus, u8 slot, u8 func)
 	res.flags = IORESOURCE_BUS;
 	printk(KERN_INFO "CNB20LE PCI Host Bridge (domain 0000 %pR)\n", &res);
 
-	for (i = 0; i < info->res_num; i++)
-		printk(KERN_INFO "host bridge window %pR\n", &info->res[i]);
+	list_for_each_entry(root_res, &info->resources, list)
+		printk(KERN_INFO "host bridge window %pR\n", &root_res->res);
 }
 
 static int __init broadcom_postcore_init(void)
diff --git a/arch/x86/pci/bus_numa.c b/arch/x86/pci/bus_numa.c
index fd3f65510e9d..306579f7d0fd 100644
--- a/arch/x86/pci/bus_numa.c
+++ b/arch/x86/pci/bus_numa.c
@@ -4,35 +4,38 @@
 
 #include "bus_numa.h"
 
-int pci_root_num;
-struct pci_root_info pci_root_info[PCI_ROOT_NR];
+LIST_HEAD(pci_root_infos);
 
-void x86_pci_root_bus_resources(int bus, struct list_head *resources)
+static struct pci_root_info *x86_find_pci_root_info(int bus)
 {
-	int i;
-	int j;
 	struct pci_root_info *info;
 
-	if (!pci_root_num)
-		goto default_resources;
+	if (list_empty(&pci_root_infos))
+		return NULL;
 
-	for (i = 0; i < pci_root_num; i++) {
-		if (pci_root_info[i].bus_min == bus)
-			break;
-	}
+	list_for_each_entry(info, &pci_root_infos, list)
+		if (info->bus_min == bus)
+			return info;
+
+	return NULL;
+}
 
-	if (i == pci_root_num)
+void x86_pci_root_bus_resources(int bus, struct list_head *resources)
+{
+	struct pci_root_info *info = x86_find_pci_root_info(bus);
+	struct pci_root_res *root_res;
+
+	if (!info)
 		goto default_resources;
 
 	printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
 	       bus);
 
-	info = &pci_root_info[i];
-	for (j = 0; j < info->res_num; j++) {
+	list_for_each_entry(root_res, &info->resources, list) {
 		struct resource *res;
 		struct resource *root;
 
-		res = &info->res[j];
+		res = &root_res->res;
 		pci_add_resource(resources, res);
 		if (res->flags & IORESOURCE_IO)
 			root = &ioport_resource;
@@ -53,11 +56,32 @@ default_resources:
 	pci_add_resource(resources, &iomem_resource);
 }
 
+struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
+						 int node, int link)
+{
+	struct pci_root_info *info;
+
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+
+	if (!info)
+		return info;
+
+	INIT_LIST_HEAD(&info->resources);
+	info->bus_min = bus_min;
+	info->bus_max = bus_max;
+	info->node = node;
+	info->link = link;
+
+	list_add_tail(&info->list, &pci_root_infos);
+
+	return info;
+}
+
 void __devinit update_res(struct pci_root_info *info, resource_size_t start,
 			  resource_size_t end, unsigned long flags, int merge)
 {
-	int i;
 	struct resource *res;
+	struct pci_root_res *root_res;
 
 	if (start > end)
 		return;
@@ -69,11 +93,11 @@ void __devinit update_res(struct pci_root_info *info, resource_size_t start,
 		goto addit;
 
 	/* try to merge it with old one */
-	for (i = 0; i < info->res_num; i++) {
+	list_for_each_entry(root_res, &info->resources, list) {
 		resource_size_t final_start, final_end;
 		resource_size_t common_start, common_end;
 
-		res = &info->res[i];
+		res = &root_res->res;
 		if (res->flags != flags)
 			continue;
 
@@ -93,14 +117,15 @@ void __devinit update_res(struct pci_root_info *info, resource_size_t start,
 addit:
 
 	/* need to add that */
-	if (info->res_num >= RES_NUM)
+	root_res = kzalloc(sizeof(*root_res), GFP_KERNEL);
+	if (!root_res)
 		return;
 
-	res = &info->res[info->res_num];
+	res = &root_res->res;
 	res->name = info->name;
 	res->flags = flags;
 	res->start = start;
 	res->end = end;
-	res->child = NULL;
-	info->res_num++;
+
+	list_add_tail(&root_res->list, &info->resources);
 }
diff --git a/arch/x86/pci/bus_numa.h b/arch/x86/pci/bus_numa.h
index 804a4b40c31a..226a466b2b2b 100644
--- a/arch/x86/pci/bus_numa.h
+++ b/arch/x86/pci/bus_numa.h
@@ -4,22 +4,24 @@
  * sub bus (transparent) will use entres from 3 to store extra from
  * root, so need to make sure we have enough slot there.
  */
-#define RES_NUM 16
+struct pci_root_res {
+	struct list_head list;
+	struct resource res;
+};
+
 struct pci_root_info {
+	struct list_head list;
 	char name[12];
-	unsigned int res_num;
-	struct resource res[RES_NUM];
+	struct list_head resources;
 	int bus_min;
 	int bus_max;
 	int node;
 	int link;
 };
 
-/* 4 at this time, it may become to 32 */
-#define PCI_ROOT_NR 4
-extern int pci_root_num;
-extern struct pci_root_info pci_root_info[PCI_ROOT_NR];
-
+extern struct list_head pci_root_infos;
+struct pci_root_info *alloc_pci_root_info(int bus_min, int bus_max,
+						int node, int link);
 extern void update_res(struct pci_root_info *info, resource_size_t start,
 		      resource_size_t end, unsigned long flags, int merge);
 #endif
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 323481e06ef8..8e04ec591543 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -430,9 +430,7 @@ void __init dmi_check_pciprobe(void)
 
 struct pci_bus * __devinit pcibios_scan_root(int busnum)
 {
-	LIST_HEAD(resources);
 	struct pci_bus *bus = NULL;
-	struct pci_sysdata *sd;
 
 	while ((bus = pci_find_next_bus(bus)) != NULL) {
 		if (bus->number == busnum) {
@@ -441,28 +439,10 @@ struct pci_bus * __devinit pcibios_scan_root(int busnum)
 		}
 	}
 
-	/* Allocate per-root-bus (not per bus) arch-specific data.
-	 * TODO: leak; this memory is never freed.
-	 * It's arguable whether it's worth the trouble to care.
-	 */
-	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
-	if (!sd) {
-		printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
-		return NULL;
-	}
-
-	sd->node = get_mp_bus_to_node(busnum);
-
-	printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
-	x86_pci_root_bus_resources(busnum, &resources);
-	bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, sd, &resources);
-	if (!bus) {
-		pci_free_resource_list(&resources);
-		kfree(sd);
-	}
-
-	return bus;
+	return pci_scan_bus_on_node(busnum, &pci_root_ops,
+					get_mp_bus_to_node(busnum));
 }
+
 void __init pcibios_set_cache_line_size(void)
 {
 	struct cpuinfo_x86 *c = &boot_cpu_data;
@@ -656,6 +636,7 @@ struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops,
 	}
 	sd->node = node;
 	x86_pci_root_bus_resources(busno, &resources);
+	printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busno);
 	bus = pci_scan_root_bus(NULL, busno, ops, sd, &resources);
 	if (!bus) {
 		pci_free_resource_list(&resources);
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 083a49fee56a..2c224edae1ac 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the PCI bus specific drivers.
 #
 
-obj-y		+= access.o bus.o probe.o remove.o pci.o \
+obj-y		+= access.o bus.o probe.o host-bridge.o remove.o pci.o \
 			pci-driver.o search.o pci-sysfs.o rom.o setup-res.o \
 			irq.o vpd.o
 obj-$(CONFIG_PROC_FS) += proc.o
diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
new file mode 100644
index 000000000000..a68dc613a5be
--- /dev/null
+++ b/drivers/pci/host-bridge.c
@@ -0,0 +1,96 @@
+/*
+ * host bridge related code
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/module.h>
+
+#include "pci.h"
+
+static struct pci_bus *find_pci_root_bus(struct pci_dev *dev)
+{
+	struct pci_bus *bus;
+
+	bus = dev->bus;
+	while (bus->parent)
+		bus = bus->parent;
+
+	return bus;
+}
+
+static struct pci_host_bridge *find_pci_host_bridge(struct pci_dev *dev)
+{
+	struct pci_bus *bus = find_pci_root_bus(dev);
+
+	return to_pci_host_bridge(bus->bridge);
+}
+
+void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
+				 void (*release_fn)(struct pci_host_bridge *),
+				 void *release_data)
+{
+	bridge->release_fn = release_fn;
+	bridge->release_data = release_data;
+}
+
+static bool resource_contains(struct resource *res1, struct resource *res2)
+{
+	return res1->start <= res2->start && res1->end >= res2->end;
+}
+
+void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
+			     struct resource *res)
+{
+	struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
+	struct pci_host_bridge_window *window;
+	resource_size_t offset = 0;
+
+	list_for_each_entry(window, &bridge->windows, list) {
+		if (resource_type(res) != resource_type(window->res))
+			continue;
+
+		if (resource_contains(window->res, res)) {
+			offset = window->offset;
+			break;
+		}
+	}
+
+	region->start = res->start - offset;
+	region->end = res->end - offset;
+}
+EXPORT_SYMBOL(pcibios_resource_to_bus);
+
+static bool region_contains(struct pci_bus_region *region1,
+			    struct pci_bus_region *region2)
+{
+	return region1->start <= region2->start && region1->end >= region2->end;
+}
+
+void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
+			     struct pci_bus_region *region)
+{
+	struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
+	struct pci_host_bridge_window *window;
+	resource_size_t offset = 0;
+
+	list_for_each_entry(window, &bridge->windows, list) {
+		struct pci_bus_region bus_region;
+
+		if (resource_type(res) != resource_type(window->res))
+			continue;
+
+		bus_region.start = window->res->start - window->offset;
+		bus_region.end = window->res->end - window->offset;
+
+		if (region_contains(&bus_region, region)) {
+			offset = window->offset;
+			break;
+		}
+	}
+
+	res->start = region->start + offset;
+	res->end = region->end + offset;
+}
+EXPORT_SYMBOL(pcibios_bus_to_resource);
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 5e1ca3c58a7d..4c2f22668ea7 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -15,13 +15,10 @@
 #define CARDBUS_LATENCY_TIMER	176	/* secondary latency timer */
 #define CARDBUS_RESERVE_BUSNR	3
 
-static LIST_HEAD(pci_host_bridges);
-
 /* Ugh.  Need to stop exporting this to modules. */
 LIST_HEAD(pci_root_buses);
 EXPORT_SYMBOL(pci_root_buses);
 
-
 static int find_anything(struct device *dev, void *data)
 {
 	return 1;
@@ -44,82 +41,6 @@ int no_pci_devices(void)
 }
 EXPORT_SYMBOL(no_pci_devices);
 
-static struct pci_host_bridge *pci_host_bridge(struct pci_dev *dev)
-{
-	struct pci_bus *bus;
-	struct pci_host_bridge *bridge;
-
-	bus = dev->bus;
-	while (bus->parent)
-		bus = bus->parent;
-
-	list_for_each_entry(bridge, &pci_host_bridges, list) {
-		if (bridge->bus == bus)
-			return bridge;
-	}
-
-	return NULL;
-}
-
-static bool resource_contains(struct resource *res1, struct resource *res2)
-{
-	return res1->start <= res2->start && res1->end >= res2->end;
-}
-
-void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
-			     struct resource *res)
-{
-	struct pci_host_bridge *bridge = pci_host_bridge(dev);
-	struct pci_host_bridge_window *window;
-	resource_size_t offset = 0;
-
-	list_for_each_entry(window, &bridge->windows, list) {
-		if (resource_type(res) != resource_type(window->res))
-			continue;
-
-		if (resource_contains(window->res, res)) {
-			offset = window->offset;
-			break;
-		}
-	}
-
-	region->start = res->start - offset;
-	region->end = res->end - offset;
-}
-EXPORT_SYMBOL(pcibios_resource_to_bus);
-
-static bool region_contains(struct pci_bus_region *region1,
-			    struct pci_bus_region *region2)
-{
-	return region1->start <= region2->start && region1->end >= region2->end;
-}
-
-void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
-			     struct pci_bus_region *region)
-{
-	struct pci_host_bridge *bridge = pci_host_bridge(dev);
-	struct pci_host_bridge_window *window;
-	struct pci_bus_region bus_region;
-	resource_size_t offset = 0;
-
-	list_for_each_entry(window, &bridge->windows, list) {
-		if (resource_type(res) != resource_type(window->res))
-			continue;
-
-		bus_region.start = window->res->start - window->offset;
-		bus_region.end = window->res->end - window->offset;
-
-		if (region_contains(&bus_region, region)) {
-			offset = window->offset;
-			break;
-		}
-	}
-
-	res->start = region->start + offset;
-	res->end = region->end + offset;
-}
-EXPORT_SYMBOL(pcibios_bus_to_resource);
-
 /*
  * PCI Bus Class
  */
@@ -501,6 +422,19 @@ static struct pci_bus * pci_alloc_bus(void)
 	return b;
 }
 
+static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
+{
+	struct pci_host_bridge *bridge;
+
+	bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
+	if (bridge) {
+		INIT_LIST_HEAD(&bridge->windows);
+		bridge->bus = b;
+	}
+
+	return bridge;
+}
+
 static unsigned char pcix_bus_speed[] = {
 	PCI_SPEED_UNKNOWN,		/* 0 */
 	PCI_SPEED_66MHz_PCIX,		/* 1 */
@@ -1201,7 +1135,14 @@ int pci_cfg_space_size(struct pci_dev *dev)
 
 static void pci_release_bus_bridge_dev(struct device *dev)
 {
-	kfree(dev);
+	struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
+
+	if (bridge->release_fn)
+		bridge->release_fn(bridge);
+
+	pci_free_resource_list(&bridge->windows);
+
+	kfree(bridge);
 }
 
 struct pci_dev *alloc_pci_dev(void)
@@ -1650,28 +1591,19 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 	int error;
 	struct pci_host_bridge *bridge;
 	struct pci_bus *b, *b2;
-	struct device *dev;
 	struct pci_host_bridge_window *window, *n;
 	struct resource *res;
 	resource_size_t offset;
 	char bus_addr[64];
 	char *fmt;
 
-	bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
-	if (!bridge)
-		return NULL;
 
 	b = pci_alloc_bus();
 	if (!b)
-		goto err_bus;
-
-	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
-	if (!dev)
-		goto err_dev;
+		return NULL;
 
 	b->sysdata = sysdata;
 	b->ops = ops;
-
 	b2 = pci_find_bus(pci_domain_nr(b), bus);
 	if (b2) {
 		/* If we already got to this bus through a different bridge, ignore it */
@@ -1679,13 +1611,17 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 		goto err_out;
 	}
 
-	dev->parent = parent;
-	dev->release = pci_release_bus_bridge_dev;
-	dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus);
-	error = device_register(dev);
+	bridge = pci_alloc_host_bridge(b);
+	if (!bridge)
+		goto err_out;
+
+	bridge->dev.parent = parent;
+	bridge->dev.release = pci_release_bus_bridge_dev;
+	dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
+	error = device_register(&bridge->dev);
 	if (error)
-		goto dev_reg_err;
-	b->bridge = get_device(dev);
+		goto bridge_dev_reg_err;
+	b->bridge = get_device(&bridge->dev);
 	device_enable_async_suspend(b->bridge);
 	pci_set_bus_of_node(b);
 
@@ -1704,9 +1640,6 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 
 	b->number = b->secondary = bus;
 
-	bridge->bus = b;
-	INIT_LIST_HEAD(&bridge->windows);
-
 	if (parent)
 		dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
 	else
@@ -1732,25 +1665,18 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 	}
 
 	down_write(&pci_bus_sem);
-	list_add_tail(&bridge->list, &pci_host_bridges);
 	list_add_tail(&b->node, &pci_root_buses);
 	up_write(&pci_bus_sem);
 
 	return b;
 
 class_dev_reg_err:
-	device_unregister(dev);
-dev_reg_err:
-	down_write(&pci_bus_sem);
-	list_del(&bridge->list);
-	list_del(&b->node);
-	up_write(&pci_bus_sem);
+	put_device(&bridge->dev);
+	device_unregister(&bridge->dev);
+bridge_dev_reg_err:
+	kfree(bridge);
 err_out:
-	kfree(dev);
-err_dev:
 	kfree(b);
-err_bus:
-	kfree(bridge);
 	return NULL;
 }
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e444f5b49118..17b7b5b01b4a 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -375,11 +375,18 @@ struct pci_host_bridge_window {
 };
 
 struct pci_host_bridge {
-	struct list_head list;
+	struct device dev;
 	struct pci_bus *bus;		/* root bus */
 	struct list_head windows;	/* pci_host_bridge_windows */
+	void (*release_fn)(struct pci_host_bridge *);
+	void *release_data;
 };
 
+#define	to_pci_host_bridge(n) container_of(n, struct pci_host_bridge, dev)
+void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
+		     void (*release_fn)(struct pci_host_bridge *),
+		     void *release_data);
+
 /*
  * The first PCI_BRIDGE_RESOURCE_NUM PCI bus resources (those that correspond
  * to P2P or CardBus bridge windows) go in a table.  Additional ones (for