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Commit 5009b460 authored by Yinghai Lu's avatar Yinghai Lu Committed by Jesse Barnes
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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: default avatarYinghai Lu <yinghai@kernel.org>
Reviewed-by: default avatarAlex Chiang <achiang@hp.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent ba02b242

drivers/pci/setup-bus.c

+82 −0
Original line number Diff line number Diff line
@@ -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;