1 files changed, 95 insertions, 57 deletions

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 319f359906e8..51a9095c7da4 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -128,16 +128,16 @@ void pci_disable_bridge_window(struct pci_dev *dev)
 }
 #endif	/* CONFIG_PCI_QUIRKS */
 
+
+
 static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
-				 int resno)
+		int resno, resource_size_t size, resource_size_t align)
 {
 	struct resource *res = dev->resource + resno;
-	resource_size_t size, min, align;
+	resource_size_t min;
 	int ret;
 
-	size = resource_size(res);
 	min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
-	align = pci_resource_alignment(dev, res);
 
 	/* First, try exact prefetching match.. */
 	ret = pci_bus_alloc_resource(bus, res, size, align, min,
@@ -154,56 +154,101 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
 		ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
 					     pcibios_align_resource, dev);
 	}
+	return ret;
+}
 
-	if (ret < 0 && dev->fw_addr[resno]) {
-		struct resource *root, *conflict;
-		resource_size_t start, end;
+static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev, 
+		int resno, resource_size_t size)
+{
+	struct resource *root, *conflict;
+	resource_size_t start, end;
+	int ret = 0;
 
-		/*
-		 * If we failed to assign anything, let's try the address
-		 * where firmware left it.  That at least has a chance of
-		 * working, which is better than just leaving it disabled.
-		 */
+	if (res->flags & IORESOURCE_IO)
+		root = &ioport_resource;
+	else
+		root = &iomem_resource;
+
+	start = res->start;
+	end = res->end;
+	res->start = dev->fw_addr[resno];
+	res->end = res->start + size - 1;
+	dev_info(&dev->dev, "BAR %d: trying firmware assignment %pR\n",
+		 resno, res);
+	conflict = request_resource_conflict(root, res);
+	if (conflict) {
+		dev_info(&dev->dev,
+			 "BAR %d: %pR conflicts with %s %pR\n", resno,
+			 res, conflict->name, conflict);
+		res->start = start;
+		res->end = end;
+		ret = 1;
+	}
+	return ret;
+}
+
+static int _pci_assign_resource(struct pci_dev *dev, int resno, int size, resource_size_t min_align)
+{
+	struct resource *res = dev->resource + resno;
+	struct pci_bus *bus;
+	int ret;
+	char *type;
 
-		if (res->flags & IORESOURCE_IO)
-			root = &ioport_resource;
+	bus = dev->bus;
+	while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align))) {
+		if (!bus->parent || !bus->self->transparent)
+			break;
+		bus = bus->parent;
+	}
+
+	if (ret) {
+		if (res->flags & IORESOURCE_MEM)
+			if (res->flags & IORESOURCE_PREFETCH)
+				type = "mem pref";
+			else
+				type = "mem";
+		else if (res->flags & IORESOURCE_IO)
+			type = "io";
 		else
-			root = &iomem_resource;
-
-		start = res->start;
-		end = res->end;
-		res->start = dev->fw_addr[resno];
-		res->end = res->start + size - 1;
-		dev_info(&dev->dev, "BAR %d: trying firmware assignment %pR\n",
-			 resno, res);
-		conflict = request_resource_conflict(root, res);
-		if (conflict) {
-			dev_info(&dev->dev,
-				 "BAR %d: %pR conflicts with %s %pR\n", resno,
-				 res, conflict->name, conflict);
-			res->start = start;
-			res->end = end;
-		} else
-			ret = 0;
+			type = "unknown";
+		dev_info(&dev->dev,
+			 "BAR %d: can't assign %s (size %#llx)\n",
+			 resno, type, (unsigned long long) resource_size(res));
 	}
 
+	return ret;
+}
+
+int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsize,
+			resource_size_t min_align)
+{
+	struct resource *res = dev->resource + resno;
+	resource_size_t new_size;
+	int ret;
+
+	if (!res->parent) {
+		dev_info(&dev->dev, "BAR %d: can't reassign an unassigned resouce %pR "
+			 "\n", resno, res);
+		return -EINVAL;
+	}
+
+	new_size = resource_size(res) + addsize + min_align;
+	ret = _pci_assign_resource(dev, resno, new_size, min_align);
 	if (!ret) {
 		res->flags &= ~IORESOURCE_STARTALIGN;
 		dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
 		if (resno < PCI_BRIDGE_RESOURCES)
 			pci_update_resource(dev, resno);
 	}
-
 	return ret;
 }
 
 int pci_assign_resource(struct pci_dev *dev, int resno)
 {
 	struct resource *res = dev->resource + resno;
-	resource_size_t align;
+	resource_size_t align, size;
 	struct pci_bus *bus;
 	int ret;
-	char *type;
 
 	align = pci_resource_alignment(dev, res);
 	if (!align) {
@@ -213,34 +258,27 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
 	}
 
 	bus = dev->bus;
-	while ((ret = __pci_assign_resource(bus, dev, resno))) {
-		if (bus->parent && bus->self->transparent)
-			bus = bus->parent;
-		else
-			bus = NULL;
-		if (bus)
-			continue;
-		break;
-	}
+	size = resource_size(res);
+	ret = _pci_assign_resource(dev, resno, size, align);
 
-	if (ret) {
-		if (res->flags & IORESOURCE_MEM)
-			if (res->flags & IORESOURCE_PREFETCH)
-				type = "mem pref";
-			else
-				type = "mem";
-		else if (res->flags & IORESOURCE_IO)
-			type = "io";
-		else
-			type = "unknown";
-		dev_info(&dev->dev,
-			 "BAR %d: can't assign %s (size %#llx)\n",
-			 resno, type, (unsigned long long) resource_size(res));
-	}
+	/*
+	 * If we failed to assign anything, let's try the address
+	 * where firmware left it.  That at least has a chance of
+	 * working, which is better than just leaving it disabled.
+	 */
+	if (ret < 0 && dev->fw_addr[resno])
+		ret = pci_revert_fw_address(res, dev, resno, size);
 
+	if (!ret) {
+		res->flags &= ~IORESOURCE_STARTALIGN;
+		dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
+		if (resno < PCI_BRIDGE_RESOURCES)
+			pci_update_resource(dev, resno);
+	}
 	return ret;
 }
 
+
 /* Sort resources by alignment */
 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
 {