From 1f96a965e30d097a25818196e33d2dce923973a7 Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Mon, 21 Jan 2013 13:20:42 -0800 Subject: PCI: acpiphp: Add is_hotplug_bridge detection When system support hotplug bridge with children hotplug slots, we need to make sure that parent bridge get preallocated resource so later when device is plugged into children slot, those children devices will get resource allocated. We do not meet this problem, because for PCIe hotplug card, when acpiphp is used, pci_scan_bridge will set that for us when detect hotplug bit in slot cap. Reported-and-tested-by: Jason Baron Signed-off-by: Yinghai Lu Signed-off-by: Bjorn Helgaas Acked-by: Jason Baron Acked-by: Rafael J. Wysocki diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 9e2b1f6..b94879d 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -797,6 +797,29 @@ static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) } } +static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) +{ + struct acpiphp_func *func; + + if (!dev->subordinate) + return; + + /* quirk, or pcie could set it already */ + if (dev->is_hotplug_bridge) + return; + + if (PCI_SLOT(dev->devfn) != slot->device) + return; + + list_for_each_entry(func, &slot->funcs, sibling) { + if (PCI_FUNC(dev->devfn) == func->function) { + /* check if this bridge has ejectable slots */ + if ((detect_ejectable_slots(func->handle) > 0)) + dev->is_hotplug_bridge = 1; + break; + } + } +} /** * enable_device - enable, configure a slot * @slot: slot to be enabled @@ -831,8 +854,10 @@ static int __ref enable_device(struct acpiphp_slot *slot) if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { max = pci_scan_bridge(bus, dev, max, pass); - if (pass && dev->subordinate) + if (pass && dev->subordinate) { + check_hotplug_bridge(slot, dev); pci_bus_size_bridges(dev->subordinate); + } } } } -- cgit v0.10.2