[PATCH] 2.5.14: New PCI allocation code (alpha, arm, parisc) [2/2]

Summary of changes:
- alpha, arm: code related to PCI-PCI bridges from pcibios_fixup_bus()
  removed - now it's generic;
- pdev_sort_resource: sort resources all together, no matter IO or memory;
- pbus_assign_resources_sorted: ditto;
- pci_bridge_check_ranges, pci_setup_bridge: changed for prefetch support;
- pbus_size_io, pbus_size_mem: core stuff; tested with randomly generated
  sets of resources;
- pbus_size_bridges: pass #2 (pass #1 is PCI probing, common for all archs);
- pbus_assign_resources: pass #3.

Ivan.

arch/alpha/kernel/pci.c

@@ -246,25 +246,6 @@ pcibios_fixup_bus(struct pci_bus *bus)
 		/* Root bus */
 		bus->resource[0] = hose->io_space;
 		bus->resource[1] = hose->mem_space;
-	} else {
-		/* This is a bridge. Do not care how it's initialized,
-		   just link its resources to the bus ones */
-		int i;
-
-		for(i=0; i<3; i++) {
-			bus->resource[i] =
-				&dev->resource[PCI_BRIDGE_RESOURCES+i];
-			bus->resource[i]->name = bus->name;
-		}
-		bus->resource[0]->flags |= pci_bridge_check_io(dev);
-		bus->resource[1]->flags |= IORESOURCE_MEM;
-		/* For now, propogate hose limits to the bus;
-		   we'll adjust them later. */
-		bus->resource[0]->end = hose->io_space->end;
-		bus->resource[1]->end = hose->mem_space->end;
-		/* Turn off downstream PF memory address range by default */
-		bus->resource[2]->start = 1024*1024;
-		bus->resource[2]->end = bus->resource[2]->start - 1;
 	}
 
 	for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
@@ -349,6 +330,10 @@ pcibios_fixup_pbus_ranges(struct pci_bus * bus,
 	ranges->io_end -= hose->io_space->start;
 	ranges->mem_start -= hose->mem_space->start;
 	ranges->mem_end -= hose->mem_space->start;
+/* FIXME: On older alphas we could use dense memory space
+	  to access prefetchable resources. */
+	ranges->prefetch_start -= hose->mem_space->start;
+	ranges->prefetch_end -= hose->mem_space->start;
 }
 
 int

arch/arm/kernel/bios32.c

@@ -346,20 +346,7 @@ pbus_assign_bus_resources(struct pci_bus *bus, struct pci_sys_data *root)
 	struct pci_dev *dev = bus->self;
 	int i;
 
-	if (dev) {
-		for (i = 0; i < 3; i++) {
-			if (root->resource[i]) {
-				bus->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
-				bus->resource[i]->end  = root->resource[i]->end;
-				bus->resource[i]->name = bus->name;
-			}
-		}
-		bus->resource[0]->flags |= pci_bridge_check_io(dev);
-		bus->resource[1]->flags |= IORESOURCE_MEM;
-
-		if (bus->resource[2] && root->resource[2])
-			bus->resource[2]->flags = root->resource[2]->flags;
-	} else {
+	if (!dev) {
 		/*
 		 * Assign root bus resources.
 		 */

drivers/pci/setup-res.c

@@ -136,47 +136,45 @@ pci_assign_resource(struct pci_dev *dev, int i)
 	return 0;
 }
 
-/* Sort resources of a given type by alignment */
+/* Sort resources by alignment */
 void __init
-pdev_sort_resources(struct pci_dev *dev,
-		    struct resource_list *head, u32 type_mask)
+pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
 {
 	int i;
 
 	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 		struct resource *r;
 		struct resource_list *list, *tmp;
-		unsigned long r_size;
-
-		/* PCI-PCI bridges may have I/O ports or
-		   memory on the primary bus */
-		if (dev->class >> 8 == PCI_CLASS_BRIDGE_PCI &&
-						i >= PCI_BRIDGE_RESOURCES)
-			continue;
+		unsigned long r_align;
 
 		r = &dev->resource[i];
-		r_size = r->end - r->start;
+		r_align = r->end - r->start;
 		
-		if (!(r->flags & type_mask) || r->parent)
+		if (!(r->flags) || r->parent)
 			continue;
-		if (!r_size) {
+		if (!r_align) {
 			printk(KERN_WARNING "PCI: Ignore bogus resource %d "
 					    "[%lx:%lx] of %s\n",
 					    i, r->start, r->end, dev->name);
 			continue;
 		}
+		r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
 		for (list = head; ; list = list->next) {
-			unsigned long size = 0;
+			unsigned long align = 0;
 			struct resource_list *ln = list->next;
+			int idx;
 
-			if (ln)
-				size = ln->res->end - ln->res->start;
-			if (r_size > size) {
-				tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
-				if (!tmp) {
-					printk(KERN_ERR "pdev_sort_resources(): kmalloc() failed!\n");
-					continue;
+			if (ln) {
+				idx = ln->res - &ln->dev->resource[0];
+				align = (idx < PCI_BRIDGE_RESOURCES) ?
+					ln->res->end - ln->res->start + 1 :
+					ln->res->start;
 			}
+			if (r_align > align) {
+				tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
+				if (!tmp)
+					panic("pdev_sort_resources(): "
+					      "kmalloc() failed!\n");
 				tmp->next = ln;
 				tmp->res = r;
 				tmp->dev = dev;

include/linux/pci.h

@@ -464,9 +464,9 @@ struct pci_ops {
 
 struct pbus_set_ranges_data
 {
-	int found_vga;
 	unsigned long io_start, io_end;
 	unsigned long mem_start, mem_end;
+	unsigned long prefetch_start, prefetch_end;
 };
 
 struct pci_device_id {
@@ -582,8 +582,7 @@ int pci_enable_wake(struct pci_dev *dev, u32 state, int enable);
 int pci_claim_resource(struct pci_dev *, int);
 void pci_assign_unassigned_resources(void);
 void pdev_enable_device(struct pci_dev *);
-void pdev_sort_resources(struct pci_dev *, struct resource_list *, u32);
-unsigned long pci_bridge_check_io(struct pci_dev *);
+void pdev_sort_resources(struct pci_dev *, struct resource_list *);
 void pci_fixup_irqs(u8 (*)(struct pci_dev *, u8 *),
 		    int (*)(struct pci_dev *, u8, u8));
 #define HAVE_PCI_REQ_REGIONS