@@ -490,6 +490,40 @@ static int pcie_port_remove_service(struct device *dev)
}
/**
+ * pcie_port_query_service - query the associated port service.
+ * dev: pcie device
+ * @port service: PCI express port service
+ */
+bool pcie_port_query_service(struct pci_dev *dev, u32 port_service)
+{
+ struct pcie_device *pdev;
+
+ list_for_each_entry(pdev, &dev->service_list, slist) {
+ if (pdev->service == port_service)
+ return true;
+ }
+ return false;
+}
+EXPORT_SYMBOL(pcie_port_query_service);
+
+/**
+ * pcie_port_upstream_bridge - returns immediate upstream bridge.
+ * dev: pcie device
+ */
+struct pci_dev *pcie_port_upstream_bridge(struct pci_dev *dev)
+{
+ struct pci_dev *parent;
+
+ parent = pci_upstream_bridge(dev);
+
+ if (parent && pci_is_pcie(parent))
+ return parent;
+
+ return NULL;
+}
+EXPORT_SYMBOL(pcie_port_upstream_bridge);
+
+/**
* pcie_port_shutdown_service - shut down given PCI Express port service
* @dev: PCI Express port service device to handle
*
@@ -68,5 +68,6 @@ struct pcie_port_service_driver {
int pcie_port_service_register(struct pcie_port_service_driver *new);
void pcie_port_service_unregister(struct pcie_port_service_driver *new);
-
+bool pcie_port_query_service(struct pci_dev *dev, u32 port_service);
+struct pci_dev *pcie_port_upstream_bridge(struct pci_dev *dev);
#endif /* _PCIEPORT_IF_H_ */
This patch implements query service interface. So that, any port service driver can query to know, if the service is active or not. When multiple service drivers try to take actions, these service drivers could race or could have conflict of interest. For e.g. when DPC is enabled, AER should not attempt recovery. The other interface walks up the parent till root bridge, so that on each pci_dev service can be queried. Signed-off-by: Oza Pawandeep <poza@codeaurora.org>