PCI: Add pcibios_add_device

Platforms may want to provide architecture-specific functionality during
PCI enumeration. Add a pcibios_add_device() call that architectures can
override to do so.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Seth Forshee <seth.forshee@canonical.com>

drivers/pci/bus.c

@@ -170,6 +170,11 @@ int pci_bus_add_device(struct pci_dev *dev)
 	int retval;
 
 	pci_fixup_device(pci_fixup_final, dev);
+
+	retval = pcibios_add_device(dev);
+	if (retval)
+		return retval;
+
 	retval = device_add(&dev->dev);
 	if (retval)
 		return retval;

drivers/pci/pci.c

@@ -1333,6 +1333,19 @@ void pcim_pin_device(struct pci_dev *pdev)
 		dr->pinned = 1;
 }
 
+/*
+ * pcibios_add_device - provide arch specific hooks when adding device dev
+ * @dev: the PCI device being added
+ *
+ * Permits the platform to provide architecture specific functionality when
+ * devices are added. This is the default implementation. Architecture
+ * implementations can override this.
+ */
+int __weak pcibios_add_device (struct pci_dev *dev)
+{
+	return 0;
+}
+
 /**
  * pcibios_disable_device - disable arch specific PCI resources for device dev
  * @dev: the PCI device to disable

include/linux/pci.h

@@ -1592,6 +1592,7 @@ void pcibios_disable_device(struct pci_dev *dev);
 void pcibios_set_master(struct pci_dev *dev);
 int pcibios_set_pcie_reset_state(struct pci_dev *dev,
 				 enum pcie_reset_state state);
+int pcibios_add_device(struct pci_dev *dev);
 
 #ifdef CONFIG_PCI_MMCONFIG
 extern void __init pci_mmcfg_early_init(void);