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[v7,24/26] PCI: hotplug: Don't reserve bus space when enabled movable BARs

Message ID 20200129152937.311162-25-s.miroshnichenko@yadro.com
State New
Headers show
Series PCI: Allow BAR movement during boot and hotplug | expand

Commit Message

Sergei Miroshnichenko Jan. 29, 2020, 3:29 p.m. UTC
A hotplugged bridge with many hotplug-capable ports may request reserving
more IO space than the machine has. This could be overridden with the
"hpiosize=" kernel argument though.

But when BARs are movable, no need to reserve space anymore: new BARs are
allocated not from reserved gaps, but via rearranging the existing BARs.
Requesting a precise amount of space for bridge windows increases the
chances of adding the new bridge successfully.

Signed-off-by: Sergei Miroshnichenko <s.miroshnichenko@yadro.com>
 drivers/pci/setup-bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index dd94b4ed7358..3ec01a74b7b6 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1316,7 +1316,7 @@  void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
-		if (bus->self->is_hotplug_bridge) {
+		if (bus->self->is_hotplug_bridge && !pci_can_move_bars) {
 			additional_io_size  = pci_hotplug_io_size;
 			additional_mmio_size = pci_hotplug_mmio_size;
 			additional_mmio_pref_size = pci_hotplug_mmio_pref_size;