From c6bde215acfd637708142ae671843b6f0eadbc6d Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Wed, 6 Nov 2013 10:11:48 -0700 Subject: [PATCH] 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 Acked-by: Yinghai Lu --- include/linux/pci.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/pci.h b/include/linux/pci.h index d3a888ae4b2e..835ec7bf6c05 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -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) {