[PATCH v10 15/29] PCI: Introduce new scan function pci_scan_host_bridge()

[Yijing Wang]

Introduce new scan function pci_scan_host_bridge() to
support host bridge drivers that need to provide platform
own pci_host_bridge_ops.

Signed-off-by: Yijing Wang <wangyijing at huawei.com>
---
 drivers/pci/probe.c |   23 +++++++++++++++++++++++
 include/linux/pci.h |    3 +++
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 83cf7c6..708bcf1 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2064,6 +2064,29 @@ void pci_bus_release_busn_res(struct pci_bus *b)
 			res, ret ? "can not be" : "is");
 }
 
+struct pci_host_bridge *pci_scan_host_bridge(
+		struct device *parent, int domain,
+		void *sysdata, struct list_head *resources,
+		struct pci_host_bridge_ops *ops)
+{
+	struct pci_host_bridge *host;
+
+	host = pci_create_host_bridge(parent, domain, sysdata,
+			resources, ops);
+	if (!host)
+		return NULL;
+
+	host->bus = __pci_create_root_bus(host, ops->pci_ops);
+	if (!host->bus) {
+		pci_free_host_bridge(host);
+		return NULL;
+	}
+
+	pci_scan_child_bus(host->bus);
+	return host;
+}
+EXPORT_SYMBOL(pci_scan_host_bridge);
+
 struct pci_bus *pci_scan_root_bus(struct device *parent, int domain,
 		int bus, struct pci_ops *ops, void *sysdata,
 		struct list_head *resources)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 91fde6a..13edbf1 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -796,6 +796,9 @@ void pci_bus_release_busn_res(struct pci_bus *b);
 struct pci_bus *pci_scan_root_bus(struct device *parent, int domain, int bus,
 					     struct pci_ops *ops, void *sysdata,
 					     struct list_head *resources);
+struct pci_host_bridge *pci_scan_host_bridge(struct device *parent,
+		int domain, void *sysdata, struct list_head *resources,
+		struct pci_host_bridge_ops *ops);
 struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
 				int busnr);
 void pcie_update_link_speed(struct pci_bus *bus, u16 link_status);
-- 
1.7.1