PCI: pciehp: second try to get big range for pcie devices

Handle the case where the slot bridge that doesn't get a pre-allocated
resource big enough to handle its child resources..  For example pcie
devices need 256M, but the bridge only gets 2M preallocated.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index b19a56b8b17a8eff1afa50aa67ddab95d8f0250c..ed545f669459f633e949cca9b4ff36ba42185040 100644 (file)
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -964,12 +964,61 @@ enable_and_dump:
 void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
 {
        struct pci_bus *parent = bridge->subordinate;
+       int tried_times = 0;
+       struct resource_list_x head, *list;
        int retval;
+       unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
+                                 IORESOURCE_PREFETCH;
+
+       head.next = NULL;
 
+again:
        pci_bus_size_bridges(parent);
-       __pci_bridge_assign_resources(bridge, NULL);
+       __pci_bridge_assign_resources(bridge, &head);
        retval = pci_reenable_device(bridge);
        pci_set_master(bridge);
        pci_enable_bridges(parent);
+
+       tried_times++;
+
+       if (!head.next)
+               return;
+
+       if (tried_times >= 2) {
+               /* still fail, don't need to try more */
+               free_failed_list(&head);
+               return;
+       }
+
+       printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
+                        tried_times + 1);
+
+       /*
+        * Try to release leaf bridge's resources that doesn't fit resource of
+        * child device under that bridge
+        */
+       for (list = head.next; list;) {
+               struct pci_bus *bus = list->dev->bus;
+               unsigned long flags = list->flags;
+
+               pci_bus_release_bridge_resources(bus, flags & type_mask,
+                                                whole_subtree);
+               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;
 }
 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);