1 files changed, 14 insertions, 0 deletions

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 0e49f70dbd9b..a38772a85588 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1928,6 +1928,20 @@ static inline int pci_pcie_type(const struct pci_dev *dev)
         return (pcie_caps_reg(dev) & PCI_EXP_FLAGS_TYPE) >> 4;
 }
 
+static inline struct pci_dev *pcie_find_root_port(struct pci_dev *dev)
+{
+        while (1) {
+                if (!pci_is_pcie(dev))
+                        break;
+                if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT)
+                        return dev;
+                if (!dev->bus->self)
+                        break;
+                dev = dev->bus->self;
+        }
+        return NULL;
+}
+
 void pci_request_acs(void);
 bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags);
 bool pci_acs_path_enabled(struct pci_dev *start,