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[v6,17/30] PCI: hotplug: movable BARs: Don't reserve IO/mem bus space

Message ID 20191024171228.877974-18-s.miroshnichenko@yadro.com
State New
Delegated to: Bjorn Helgaas
Headers show
Series PCI: Allow BAR movement during hotplug | expand

Commit Message

Sergei Miroshnichenko Oct. 24, 2019, 5:12 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, there are 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: Sergey 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 675a612236d7..a68ec726010e 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1285,7 +1285,7 @@  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_mem_size = pci_hotplug_mem_size;