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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>
This commit is contained in:
Bjorn Helgaas 2013-11-06 10:11:48 -07:00
parent 0e4ccb1505
commit c6bde215ac
1 changed files with 9 additions and 0 deletions
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9
include/linux/pci.h
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@ -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)
{