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 b19a56b..ed545f6 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -964,12 +964,61 @@
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);