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PCI bridge window logic needs to find out in advance to the actual allocation if there is an empty space big enough to fit the window. Export find_resource_space() for the purpose. Also move the struct resource_constraint into generic header to be able to use the new interface. Link: https://lore.kernel.org/r/20240507102523.57320-7-ilpo.jarvinen@linux.intel.com Tested-by: Lidong Wang <lidong.wang@intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>