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path: root/drivers/pci/setup-bus.c
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Diffstat (limited to 'drivers/pci/setup-bus.c')
-rw-r--r--drivers/pci/setup-bus.c114
1 files changed, 2 insertions, 112 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 4fe36d2e1049..19b111383f62 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -838,65 +838,11 @@ static void pci_bus_dump_resources(struct pci_bus *bus)
}
}
-static int __init pci_bus_get_depth(struct pci_bus *bus)
-{
- int depth = 0;
- struct pci_dev *dev;
-
- list_for_each_entry(dev, &bus->devices, bus_list) {
- int ret;
- struct pci_bus *b = dev->subordinate;
- if (!b)
- continue;
-
- ret = pci_bus_get_depth(b);
- if (ret + 1 > depth)
- depth = ret + 1;
- }
-
- return depth;
-}
-static int __init pci_get_max_depth(void)
-{
- int depth = 0;
- struct pci_bus *bus;
-
- list_for_each_entry(bus, &pci_root_buses, node) {
- int ret;
-
- ret = pci_bus_get_depth(bus);
- if (ret > depth)
- depth = ret;
- }
-
- return depth;
-}
-
-/*
- * first try will not touch pci bridge res
- * second and later try will clear small leaf bridge res
- * will stop till to the max deepth if can not find good one
- */
void __init
pci_assign_unassigned_resources(void)
{
struct pci_bus *bus;
- int tried_times = 0;
- enum release_type rel_type = leaf_only;
- struct resource_list_x head, *list;
- unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
- IORESOURCE_PREFETCH;
- unsigned long failed_type;
- int max_depth = pci_get_max_depth();
- int pci_try_num;
- head.next = NULL;
-
- pci_try_num = max_depth + 1;
- printk(KERN_DEBUG "PCI: max bus depth: %d pci_try_num: %d\n",
- max_depth, pci_try_num);
-
-again:
/* Depth first, calculate sizes and alignments of all
subordinate buses. */
list_for_each_entry(bus, &pci_root_buses, node) {
@@ -904,65 +850,9 @@ again:
}
/* Depth last, allocate resources and update the hardware. */
list_for_each_entry(bus, &pci_root_buses, node) {
- __pci_bus_assign_resources(bus, &head);
- }
- tried_times++;
-
- /* any device complain? */
- if (!head.next)
- goto enable_and_dump;
- failed_type = 0;
- for (list = head.next; list;) {
- failed_type |= list->flags;
- list = list->next;
- }
- /*
- * io port are tight, don't try extra
- * or if reach the limit, don't want to try more
- */
- failed_type &= type_mask;
- if ((failed_type == IORESOURCE_IO) || (tried_times >= pci_try_num)) {
- free_failed_list(&head);
- goto enable_and_dump;
- }
-
- printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
- tried_times + 1);
-
- /* third times and later will not check if it is leaf */
- if ((tried_times + 1) > 2)
- rel_type = whole_subtree;
-
- /*
- * Try to release leaf bridge's resources that doesn't fit resource of
- * child device under that bridge
- */
- for (list = head.next; list;) {
- bus = list->dev->bus;
- pci_bus_release_bridge_resources(bus, list->flags & type_mask,
- rel_type);
- list = list->next;
- }
- /* restore size and flags */
- for (list = head.next; list;) {
- struct resource *res = list->res;
-
- res->start = list->start;
- res->end = list->end;
- res->flags = list->flags;
- if (list->dev->subordinate)
- res->flags = 0;
-
- list = list->next;
- }
- free_failed_list(&head);
-
- goto again;
-
-enable_and_dump:
- /* Depth last, update the hardware. */
- list_for_each_entry(bus, &pci_root_buses, node)
+ pci_bus_assign_resources(bus);
pci_enable_bridges(bus);
+ }
/* dump the resource on buses */
list_for_each_entry(bus, &pci_root_buses, node) {