On Wed, Oct 30, 2019 at 12:47:44PM +0000, Nicholas Johnson wrote: > Remove checks for resource size in extend_bridge_window(). This is > necessary to allow the pci_bus_distribute_available_resources() to > function when the kernel parameter pci=hpmemsize=nn[KMG] is used to > allocate resources. Because the kernel parameter sets the size of all > hotplug bridges to be the same, there are problems when nested hotplug > bridges are encountered. Fitting a downstream hotplug bridge with size X > and normal bridges with non-zero size Y into parent hotplug bridge with > size X is impossible, and hence the downstream hotplug bridge needs to > shrink to fit into its parent. > > Add check for if bridge is extended or shrunken and adjust pci_dbg to > reflect this. > > Reset the resource if its new size is zero (if we have run out of a > bridge window resource) to prevent the PCI resource assignment code from > attempting to assign a zero-sized resource. > > Rename extend_bridge_window() to adjust_bridge_window() to reflect the > fact that the window can now shrink. > > Signed-off-by: Nicholas Johnson <nicholas.johnson-opensource@xxxxxxxxxxxxxx> Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
