[PATCH 08/11] pci: pciehp second try to get big range for pcie devices

Yinghai Lu
2010-01-16T02:43:33Z

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@kernel.org>
---
drivers/pci/setup-bus.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 49 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index c348882..2ff34ca 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1009,12 +1009,60 @@ void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
{
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_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_bridge_resources(bus, flags & type_mask,
+ whole_subtree);
+ 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);
--
1.6.4.2