I'm tyring to support bridge hotplug and devices below it in qemu via acpi
hotplug. Currently only 1 level or 32 slots are supported. By allowing for a
second level, we will be able to support 32^2 devices.
If I first hotplug the bridge with no devices intially below it, the hotplug
code sets the bridge memory window to 0 and does not increase it when
subsequent devices are added below it.
Fix this, by calling pci_rescan_bus_bridge_resize(), on the bridge directly
below the root to re-size all the birdge windows that may have changed.
Signed-off-by: Jason Baron <jbaron@xxxxxxxxxx>
---
drivers/pci/hotplug/acpiphp_glue.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 806c44f..8960c1e 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -792,6 +792,7 @@ static int __ref enable_device(struct acpiphp_slot *slot)
{
struct pci_dev *dev;
struct pci_bus *bus = slot->bridge->pci_bus;
+ struct pci_bus *rescan_bus;
struct acpiphp_func *func;
int retval = 0;
int num, max, pass;
@@ -821,6 +822,13 @@ static int __ref enable_device(struct acpiphp_slot *slot)
}
}
+ /* Ensure we rescan/setup a bridge for new devs hanging off of it */
+ rescan_bus = bus;
+ while (rescan_bus->parent && rescan_bus->parent->self)
+ rescan_bus = rescan_bus->parent;
+ if (rescan_bus->self)
+ pci_rescan_bus_bridge_resize(rescan_bus->self);
+
list_for_each_entry(func, &slot->funcs, sibling)
acpiphp_bus_add(func);
--
1.7.7.6
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