PCI: xilinx: Convert PCI scan API to pci_scan_root_bus_bridge()

The introduction of pci_scan_root_bus_bridge() provides a PCI core API to
scan a PCI root bus backed by an already initialized struct pci_host_bridge
object, which simplifies the bus scan interface and makes the PCI scan root
bus interface easier to generalize as members are added to the struct
pci_host_bridge.

Convert PCI xilinx host code to pci_scan_root_bus_bridge() to improve the
PCI root bus scanning interface.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Michal Simek <michal.simek@xilinx.com>

1 files changed, 19 insertions, 10 deletions

diff --git a/drivers/pci/host/pcie-xilinx.c b/drivers/pci/host/pcie-xilinx.c
index 2fe2df51f9f8..761f048480e9 100644
--- a/drivers/pci/host/pcie-xilinx.c
+++ b/drivers/pci/host/pcie-xilinx.c
@@ -633,6 +633,7 @@ static int xilinx_pcie_probe(struct platform_device *pdev)
         struct device *dev = &pdev->dev;
         struct xilinx_pcie_port *port;
         struct pci_bus *bus, *child;
+        struct pci_host_bridge *bridge;
         int err;
         resource_size_t iobase = 0;
         LIST_HEAD(res);
@@ -640,9 +641,11 @@ static int xilinx_pcie_probe(struct platform_device *pdev)
         if (!dev->of_node)
                 return -ENODEV;
 
-        port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
-        if (!port)
-                return -ENOMEM;
+        bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port));
+        if (!bridge)
+                return -ENODEV;
+
+        port = pci_host_bridge_priv(bridge);
 
         port->dev = dev;
 
@@ -671,17 +674,23 @@ static int xilinx_pcie_probe(struct platform_device *pdev)
         if (err)
                 goto error;
 
-        bus = pci_create_root_bus(dev, 0, &xilinx_pcie_ops, port, &res);
-        if (!bus) {
-                err = -ENOMEM;
-                goto error;
-        }
+
+        list_splice_init(&res, &bridge->windows);
+        bridge->dev.parent = dev;
+        bridge->sysdata = port;
+        bridge->busnr = 0;
+        bridge->ops = &xilinx_pcie_ops;
 
 #ifdef CONFIG_PCI_MSI
         xilinx_pcie_msi_chip.dev = dev;
-        bus->msi = &xilinx_pcie_msi_chip;
+        bridge->msi = &xilinx_pcie_msi_chip;
 #endif
-        pci_scan_child_bus(bus);
+        err = pci_scan_root_bus_bridge(bridge);
+        if (err < 0)
+                goto error;
+
+        bus = bridge->bus;
+
         pci_assign_unassigned_bus_resources(bus);
 #ifndef CONFIG_MICROBLAZE
         pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);