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Subject[PATCH 2/9] pci: add pci_bridge_release_unused_res and pci_bus_release_unused_bridge_res

so later we could use it to release small resource before pci assign unassign res

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

---
drivers/pci/setup-bus.c | 112 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 111 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
@@ -609,13 +609,123 @@ void __ref pci_bus_assign_resources(cons
}
EXPORT_SYMBOL(pci_bus_assign_resources);

+static void release_children_resource(struct resource *r)
+{
+ struct resource *p;
+ resource_size_t size;
+
+ p = r->child;
+ while (p) {
+ release_children_resource(p);
+ release_resource(p);
+ printk(KERN_DEBUG "PCI: release child resource %pRt\n", p);
+ /* need to restore size, and keep flags */
+ size = resource_size(p);
+ p->start = 0;
+ p->end = size - 1;
+ p = r->child;
+ }
+}
+
+static void pci_bridge_release_unused_res(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;
+
+ /* for pci bridges res only */
+ dev = bus->self;
+ for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_BRIDGE_RESOURCES + 3;
+ 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_children_resource(r);
+ if (!release_resource(r)) {
+ dev_printk(KERN_DEBUG, &dev->dev,
+ "resource %d %pRt released\n", idx, r);
+ 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);
+ }
+}
+
+/*
+ * try to release pci bridge resources that is from leaf bridge,
+ * so we can allocate big new one later
+ * check:
+ * 0: only release the bridge and only the bridge is leaf
+ * 1: release all down side bridge for third shoot
+ */
+static void __ref pci_bus_release_unused_bridge_res(struct pci_bus *bus,
+ unsigned long type,
+ int check_leaf)
+{
+ 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 (!check_leaf)
+ pci_bus_release_unused_bridge_res(b, type,
+ check_leaf);
+ 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 ((check_leaf && is_leaf_bridge) || !check_leaf)
+ pci_bridge_release_unused_res(bus, type);
+ break;
+ }
+}
+
static void pci_bus_dump_res(struct pci_bus *bus)
{
int i;

for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
struct resource *res = bus->resource[i];
- if (!res || !res->end)
+
+ if (!res || !res->end)
continue;

dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res);


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