PCI: Add pci_bus_clip_resource() to clip to fit upstream window

}

EXPORT_SYMBOL(pci_bus_alloc_resource);

/*

 * The @idx resource of @dev should be a PCI-PCI bridge window.  If this

 * resource fits inside a window of an upstream bridge, do nothing.  If it

 * overlaps an upstream window but extends outside it, clip the resource so

 * it fits completely inside.

 */

bool pci_bus_clip_resource(struct pci_dev *dev, int idx)

{

	struct pci_bus *bus = dev->bus;

	struct resource *res = &dev->resource[idx];

	struct resource orig_res = *res;

	struct resource *r;

	int i;

	pci_bus_for_each_resource(bus, r, i) {

		resource_size_t start, end;

		if (!r)

			continue;

		if (resource_type(res) != resource_type(r))

			continue;

		start = max(r->start, res->start);

		end = min(r->end, res->end);

		if (start > end)

			continue;	/* no overlap */

		if (res->start == start && res->end == end)

			return false;	/* no change */

		res->start = start;

		res->end = end;

		dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n",

				 &orig_res, res);

		return true;

	}

	return false;

}

void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }

/**

void __pci_bus_assign_resources(const struct pci_bus *bus,

				struct list_head *realloc_head,

				struct list_head *fail_head);

bool pci_bus_clip_resource(struct pci_dev *dev, int idx);

/**

 * pci_ari_enabled - query ARI forwarding status