so later we could use it to release small resource before pci assign unassign res
-v2: change name to release_child_resources according to Jesse
-v3: according to Linus, move release_child_resources to resource.c
also need to put the lock around them all to avoid recursive deep.
(my test case only have one level that need to be released)
-v4: seperate release_child_resources to another patch
according to Bjorn, change hard code 3 to PCI_BRIDGE_RESOURCE_END
-v5: remove unused in the name, and also use enum for release type according
to Jesse
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
drivers/pci/setup-bus.c | 95 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 95 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 52fbd42..3dcbb65 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -604,6 +604,101 @@ void __ref pci_bus_assign_resources(const struct pci_bus *bus)
}
EXPORT_SYMBOL(pci_bus_assign_resources);
+static void pci_bridge_release_resources(struct pci_bus *bus,
+ unsigned long type)
+{
+ int idx;
+ bool changed = false;
+ struct pci_dev *dev;
+ struct resource *r;
+ unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
+ IORESOURCE_PREFETCH;
+
+ dev = bus->self;
+ for (idx = PCI_BRIDGE_RESOURCES; idx <= PCI_BRIDGE_RESOURCE_END;
+ idx++) {
+ r = &dev->resource[idx];
+ if ((r->flags & type_mask) != type)
+ continue;
+ if (!r->parent)
+ continue;
+ /*
+ * if there are children under that, we should release them
+ * all
+ */
+ release_child_resources(r);
+ if (!release_resource(r)) {
+ dev_printk(KERN_DEBUG, &dev->dev,
+ "resource %d %pR released\n", idx, r);
+ /* keep the old size */
+ r->end = resource_size(r) - 1;
+ r->start = 0;
+ r->flags = 0;
+ changed = true;
+ }
+ }
+
+ if (changed) {
+ if (type & IORESOURCE_PREFETCH) {
+ /* avoiding touch the one without PREF */
+ type = IORESOURCE_PREFETCH;
+ }
+ __pci_setup_bridge(bus, type);
+ }
+}
+
+enum release_type {
+ leaf_only,
+ whole_subtree,
+};
+/*
+ * try to release pci bridge resources that is from leaf bridge,
+ * so we can allocate big new one later
+ */
+static void __ref pci_bus_release_bridge_resources(struct pci_bus *bus,
+ unsigned long type,
+ enum release_type rel_type)
+{
+ struct pci_dev *dev;
+ bool is_leaf_bridge = true;
+
+ list_for_each_entry(dev, &bus->devices, bus_list) {
+ struct pci_bus *b = dev->subordinate;
+ if (!b)
+ continue;
+
+ switch (dev->class >> 8) {
+ case PCI_CLASS_BRIDGE_CARDBUS:
+ is_leaf_bridge = false;
+ break;
+
+ case PCI_CLASS_BRIDGE_PCI:
+ default:
+ is_leaf_bridge = false;
+ if (rel_type == whole_subtree)
+ pci_bus_release_bridge_resources(b, type,
+ whole_subtree);
+ break;
+ }
+ }
+
+ /* The root bus? */
+ if (!bus->self)
+ return;
+
+ switch (bus->self->class >> 8) {
+ case PCI_CLASS_BRIDGE_CARDBUS:
+ break;
+
+ case PCI_CLASS_BRIDGE_PCI:
+ default:
+ if (((rel_type == leaf_only) && is_leaf_bridge) ||
+ (rel_type == whole_subtree))
+ pci_bridge_release_resources(bus, type);
+ break;
+ }
+}
+
static void pci_bus_dump_res(struct pci_bus *bus)
{
int i;
--
1.6.4.2
--
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