On Fri, Jul 26, 2019 at 12:54:22PM +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 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. Maybe you could show the topology here which needs shrinking. > 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). If it is set to zero size and left, it can > cause significant problems when it comes to enabling devices. Same comment here about explaining the "significant problems". > > Signed-off-by: Nicholas Johnson <nicholas.johnson-opensource@xxxxxxxxxxxxxx> > --- > drivers/pci/setup-bus.c | 16 +++++++++++----- > 1 file changed, 11 insertions(+), 5 deletions(-) > > diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c > index a072781ab..7e1dc892a 100644 > --- a/drivers/pci/setup-bus.c > +++ b/drivers/pci/setup-bus.c > @@ -1823,13 +1823,19 @@ static void extend_bridge_window(struct pci_dev *bridge, struct resource *res, Since it is also shrinking now maybe name it adjust_bridge_window() instead?
