From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
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@xxxxxxxxxx>
Acked-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
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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