Commit c6bde215 authored Nov 06, 2013 by Bjorn Helgaas

PCI: Add pci_upstream_bridge()



This adds a pci_upstream_bridge() interface to find the PCI-to-PCI bridge
upstream from a device.  This is typically just "dev->bus->self", but in
the case of a VF on a virtual bus, we have to start from the corresponding
PF.  Returns NULL if there is no upstream PCI bridge, i.e., if the device
is on a root bus.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>

parent 0e4ccb15

include/linux/pci.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -480,6 +480,15 @@ static inline bool pci_is_root_bus(struct pci_bus *pbus)
		return !(pbus->parent);
		}

		static inline struct pci_dev pci_upstream_bridge(struct pci_dev dev)
		{
		dev = pci_physfn(dev);
		if (pci_is_root_bus(dev->bus))
		return NULL;

		return dev->bus->self;
		}

		#ifdef CONFIG_PCI_MSI
		static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev)
		{