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authorYinghai Lu <yinghai@kernel.org>2010-01-22 01:02:20 -0800
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-02-22 16:17:19 -0800
commit5009b46025acb2d3955d2c93574604fba667ef39 (patch)
tree13c9822a92c3b797364313f1e52856caf6ab67c3 /drivers/pci/setup-bus.c
parentba02b242bbf8e4e1bc63d62e8ccec33b4e5ea132 (diff)
PCI: add pci_bridge_release_resources and pci_bus_release_bridge_resources
We use this in later patches to free resrouce ranges for reassignment in an effort to support a wider variety of PCI topologies. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Reviewed-by: Alex Chiang <achiang@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/setup-bus.c')
-rw-r--r--drivers/pci/setup-bus.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 52fbd426a1c7..7371a5479a99 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -604,6 +604,88 @@ 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) {
+ /* avoiding touch the one without PREF */
+ if (type & IORESOURCE_PREFETCH)
+ 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;
+
+ is_leaf_bridge = false;
+
+ if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
+ continue;
+
+ if (rel_type == whole_subtree)
+ pci_bus_release_bridge_resources(b, type,
+ whole_subtree);
+ }
+
+ if (pci_is_root_bus(bus))
+ return;
+
+ if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI)
+ return;
+
+ if ((rel_type == whole_subtree) || is_leaf_bridge)
+ pci_bridge_release_resources(bus, type);
+}
+
static void pci_bus_dump_res(struct pci_bus *bus)
{
int i;