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Subject[PATCH 9/9] pci: pciehp second try to get big range for pcie devices

handle the case the slot bridge that doesn't get pre-allocated big enough res
from FW.
for example pcie devices need 256M, but the bridge only get preallocated 2M...

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
drivers/pci/setup-bus.c | 41 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 40 insertions(+), 1 deletion(-)
Index: linux-2.6/drivers/pci/setup-bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/setup-bus.c
+++ linux-2.6/drivers/pci/setup-bus.c
@@ -970,13 +970,52 @@ void pci_assign_unassigned_bridge_resour
{
struct pci_bus *bus;
struct pci_bus *parent = bridge->subordinate;
+ bool second_tried = false;
+ struct resource_list head, *list, *tmp;
int retval;
+ unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
+ IORESOURCE_PREFETCH;
+
+again:
+ head.next = NULL;

pci_bus_size_bridges(parent);
pci_clear_master(bridge);
- __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);
+
+ /* any device complain? */
+ if (!head.next)
+ return;
+
+ if (second_tried) {
+ /* still fail, don't want to try more */
+ free_failed_list(&head);
+ return;
+ }
+
+ second_tried = true;
+ printk(KERN_DEBUG "PCI: second try to assign unassigned res\n");
+
+ /*
+ * Try to release leaf bridge's resources that doesn't fit resource of
+ * child device under that bridge
+ */
+ for (list = head.next; list;) {
+ unsigned long flags = list->res->flags;
+
+ bus = list->dev->bus;
+ if (list->dev->subordinate)
+ list->res->flags = 0;
+ pci_bus_release_unused_bridge_res(bus, flags & type_mask, 0);
+
+ tmp = list;
+ list = list->next;
+ kfree(tmp);
+ }
+
+ goto again;
}
EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);


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