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| author | Bjorn Helgaas <bhelgaas@google.com> | 2013-11-06 10:11:48 -0700 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2013-11-07 14:44:27 -0700 |
| commit | c6bde215acfd637708142ae671843b6f0eadbc6d (patch) | |
| tree | 675cb68ac1aff4f6444e231956dc55ec92a8cb61 | |
| parent | 0e4ccb1505a9e29c50170742ce26ac4655baab2d (diff) | |
| download | linux-c6bde215acfd637708142ae671843b6f0eadbc6d.tar.gz linux-c6bde215acfd637708142ae671843b6f0eadbc6d.tar.bz2 linux-c6bde215acfd637708142ae671843b6f0eadbc6d.zip | |
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>
| -rw-r--r-- | include/linux/pci.h | 9 |
1 files changed, 9 insertions, 0 deletions
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) { |