Messages in this thread Patch in this message | | | From | Jiri Slaby <> | Subject | [PATCH 3.12 10/56] PCI: Add pci_upstream_bridge() | Date | Wed, 3 Sep 2014 11:26:29 +0200 |
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From: Bjorn Helgaas <bhelgaas@google.com>
3.12-stable review patch. If anyone has any objections, please let me know.
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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> --- include/linux/pci.h | 9 +++++++++ 1 file changed, 9 insertions(+)
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) { -- 2.1.0
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