PCI: introduce pci_assign_unassigned_bridge_resources

For use by pciehp.

pci_setup_bridge() will not check enabled for the slot bridge, otherwise
update res is not updated to bridge BAR.  That is, bridge is already
enabled for port service.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Reviewed-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/setup-bus.c

@@ -71,35 +71,34 @@ static void free_failed_list(struct resource_list_x *head)
 	head->next = NULL;
 }
 
-static void pbus_assign_resources_sorted(const struct pci_bus *bus,
-					 struct resource_list_x *fail_head)
+static void __dev_sort_resources(struct pci_dev *dev,
+				 struct resource_list *head)
 {
-	struct pci_dev *dev;
-	struct resource *res;
-	struct resource_list head, *list, *tmp;
-	int idx;
-
-	head.next = NULL;
-	list_for_each_entry(dev, &bus->devices, bus_list) {
 	u16 class = dev->class >> 8;
 
 	/* Don't touch classless devices or host bridges or ioapics.  */
-		if (class == PCI_CLASS_NOT_DEFINED ||
-		    class == PCI_CLASS_BRIDGE_HOST)
-			continue;
+	if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST)
+		return;
 
 	/* Don't touch ioapic devices already enabled by firmware */
 	if (class == PCI_CLASS_SYSTEM_PIC) {
 		u16 command;
 		pci_read_config_word(dev, PCI_COMMAND, &command);
 		if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
-				continue;
+			return;
 	}
 
-		pdev_sort_resources(dev, &head);
-	}
+	pdev_sort_resources(dev, head);
+}
 
-	for (list = head.next; list;) {
+static void __assign_resources_sorted(struct resource_list *head,
+				 struct resource_list_x *fail_head)
+{
+	struct resource *res;
+	struct resource_list *list, *tmp;
+	int idx;
+
+	for (list = head->next; list;) {
 		res = list->res;
 		idx = res - &list->dev->resource[0];
 		if (pci_assign_resource(list->dev, idx)) {
@@ -115,6 +114,30 @@ static void pbus_assign_resources_sorted(const struct pci_bus *bus,
 	}
 }
 
+static void pdev_assign_resources_sorted(struct pci_dev *dev,
+				 struct resource_list_x *fail_head)
+{
+	struct resource_list head;
+
+	head.next = NULL;
+	__dev_sort_resources(dev, &head);
+	__assign_resources_sorted(&head, fail_head);
+
+}
+
+static void pbus_assign_resources_sorted(const struct pci_bus *bus,
+					 struct resource_list_x *fail_head)
+{
+	struct pci_dev *dev;
+	struct resource_list head;
+
+	head.next = NULL;
+	list_for_each_entry(dev, &bus->devices, bus_list)
+		__dev_sort_resources(dev, &head);
+
+	__assign_resources_sorted(&head, fail_head);
+}
+
 void pci_setup_cardbus(struct pci_bus *bus)
 {
 	struct pci_dev *bridge = bus->self;
@@ -273,9 +296,6 @@ static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
 {
 	struct pci_dev *bridge = bus->self;
 
-	if (pci_is_enabled(bridge))
-		return;
-
 	dev_info(&bridge->dev, "PCI bridge to [bus %02x-%02x]\n",
 		 bus->secondary, bus->subordinate);
 
@@ -646,6 +666,7 @@ static void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
 
 		switch (dev->class >> 8) {
 		case PCI_CLASS_BRIDGE_PCI:
+			if (!pci_is_enabled(dev))
 				pci_setup_bridge(b);
 			break;
 
@@ -667,6 +688,34 @@ void __ref pci_bus_assign_resources(const struct pci_bus *bus)
 }
 EXPORT_SYMBOL(pci_bus_assign_resources);
 
+static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge,
+					 struct resource_list_x *fail_head)
+{
+	struct pci_bus *b;
+
+	pdev_assign_resources_sorted((struct pci_dev *)bridge, fail_head);
+
+	b = bridge->subordinate;
+	if (!b)
+		return;
+
+	__pci_bus_assign_resources(b, fail_head);
+
+	switch (bridge->class >> 8) {
+	case PCI_CLASS_BRIDGE_PCI:
+		pci_setup_bridge(b);
+		break;
+
+	case PCI_CLASS_BRIDGE_CARDBUS:
+		pci_setup_cardbus(b);
+		break;
+
+	default:
+		dev_info(&bridge->dev, "not setting up bridge for bus "
+			 "%04x:%02x\n", pci_domain_nr(b), b->number);
+		break;
+	}
+}
 static void pci_bridge_release_resources(struct pci_bus *bus,
 					  unsigned long type)
 {
@@ -911,3 +960,16 @@ enable_and_dump:
 		pci_bus_dump_resources(bus);
 	}
 }
+
+void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
+{
+	struct pci_bus *parent = bridge->subordinate;
+	int retval;
+
+	pci_bus_size_bridges(parent);
+	__pci_bridge_assign_resources(bridge, NULL);
+	retval = pci_reenable_device(bridge);
+	pci_set_master(bridge);
+	pci_enable_bridges(parent);
+}
+EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);

include/linux/pci.h

@@ -801,6 +801,7 @@ void pci_bus_assign_resources(const struct pci_bus *bus);
 void pci_bus_size_bridges(struct pci_bus *bus);
 int pci_claim_resource(struct pci_dev *, int);
 void pci_assign_unassigned_resources(void);
+void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge);
 void pdev_enable_device(struct pci_dev *);
 void pdev_sort_resources(struct pci_dev *, struct resource_list *);
 int pci_enable_resources(struct pci_dev *, int mask);