PCI 設備枚舉流程

//0、pci子系統首先注冊pci?bus
struct?bus_type?pci_bus_type?=?{
	.name		=?"pci",
	.match		=?pci_bus_match,
	.uevent		=?pci_uevent,
	.probe		=?pci_device_probe,
	.remove		=?pci_device_remove,
	.shutdown	=?pci_device_shutdown,
	.dev_groups	=?pci_dev_groups,
	.bus_groups	=?pci_bus_groups,
	.drv_groups	=?pci_drv_groups,
	.pm		=?PCI_PM_OPS_PTR,
	.num_vf		=?pci_bus_num_vf,
};
EXPORT_SYMBOL(pci_bus_type);

static?int?__init?pci_driver_init(void)
{
	return?bus_register(&pci_bus_type);
}
postcore_initcall(pci_driver_init);/*?將初始化函數放到內核代碼特殊段，內核啟動將會自動調用初始化函數?*/

/*?設備的枚舉流程和設備的驅動的調用過程?*/
//1、pci控制器?設備樹節點將會配轉換成platform?device
????	pcie@3400000?{
			compatible?=?"fsl,ls1021a-pcie",?"snps,dw-pcie";
			....
		?????｝		
//2、pci控制器匹配platform?driver
static?const?struct?of_device_id?ls_pcie_of_match[]?=?{
	{?.compatible?=?"fsl,ls1021a-pcie",?.data?=?&ls1021_drvdata?},
	..
	}
static?struct?platform_driver?ls_pcie_driver?=?{
	.driver?=?{
		.name?=?"layerscape-pcie",
		.of_match_table?=?ls_pcie_of_match,
		.suppress_bind_attrs?=?true,
	},
};
builtin_platform_driver_probe(ls_pcie_driver,?ls_pcie_probe);
//3、執行pci控制器驅動函數ls_pcie_probe函數將被調用，直到pci_bus_type.pci_device_probe被調用
????????ls_add_pcie_port
????????????pci_bus_add_devices
????????????????pci_bus_add_device
????????????????????device_attach
????????????????????????__device_attach
????????????????????????????__device_attach_driver
????????????????????????????????driver_probe_device
????????????????????????????????????really_probe
????????????????????????????????????????dev->bus->probe//將調用pci_bus_type.pci_device_probe
//4、枚舉pci設備調用設備驅動
????pci_device_probe
????????__pci_device_probe
????????????pci_call_probe
???????????????local_pci_probe
???????????????????pci_drv->probe//設備的驅動的probe將被調用。