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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 | 114 +++++++++++++++++++++++++++++++++++++++++++++++-
    1 file changed, 113 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
    @@ -609,6 +609,118 @@ 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);
    + /* 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);
    + }
    +}
    +
    +/*
    + * 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;


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