diff options
| author | Bjorn Helgaas <bhelgaas@google.com> | 2013-11-06 10:11:48 -0700 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-09-03 10:54:30 +0200 |
| commit | 5d1ab637d00b258f7852c963771ed4f1fd0b2de3 (patch) | |
| tree | 4de4c586f37b48dc6c6993add3997d96fee393e5 | |
| parent | c27a4fe151abf351665639eef0ee2fef7e6fb4f9 (diff) | |
| download | lwn-5d1ab637d00b258f7852c963771ed4f1fd0b2de3.tar.gz lwn-5d1ab637d00b258f7852c963771ed4f1fd0b2de3.zip | |
PCI: Add pci_upstream_bridge()
commit c6bde215acfd637708142ae671843b6f0eadbc6d upstream.
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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -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 da172f956ad6..db4ce115705e 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -478,6 +478,15 @@ 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) { |