PCI 设备枚举流程

//0、pci子系统首先注册pci busstruct 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);/* 将初始化函数放到内核代码特殊段，内核启动将会自动调用初始化函数 *//* 设备的枚举流程和设备的驱动的调用过程 *///1、pci控制器 设备树节点将会配转换成platform device        pcie@3400000 {                        compatible = "fsl,ls1021a-pcie", "snps,dw-pcie";                        ....                     ｝          //2、pci控制器匹配platform driverstatic 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、执行pci控制器驱动函数ls_pcie_probe函数将被调用，直到pci_bus_type.pci_device_probe被调用        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//将调用pci_bus_type.pci_device_probe//4、枚举pci设备调用设备驱动    pci_device_probe        __pci_device_probe            pci_call_probe               local_pci_probe                   pci_drv->probe//设备的驱动的probe将被调用。