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...
-v2: use resource_list_x
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
drivers/pci/setup-bus.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 48 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
@@ -1021,13 +1021,60 @@ void pci_assign_unassigned_bridge_resour
{
struct pci_bus *bus;
struct pci_bus *parent = bridge->subordinate;
+ bool second_tried = false;
+ 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_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 need 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->flags;
+
+ bus = list->dev->bus;
+ pci_bus_release_unused_bridge_res(bus, flags & type_mask, 0);
+ list = list->next;
+ }
+ /* retore 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);
--
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