pcie设备驱动无法工作排查

pci_register_driver() (include/linux/pci.h)
  -->pci_register_driver()  (drivers/pci/pci-driver.c)
    -->driver_register()  (drivers/base/driver.c)
      -->bus_add_driver (drivers/base/driver.c)
        -->driver_attach() (drivers/base/dd.c)
          -->bus_for_each_dev __driver_attach()  (drivers/base/dd.c)
            -->driver_match_device()
                pci_bus_match

driver_match_device()
  -->pci_bus_match  (drivers/pci/pci-driver.c)
    -->pci_match_device() (drivers/pci/pci-driver.c)
      -->pci_match_id() (drivers/pci/pci-driver.c)
        -->pci_match_one_device （drivers/pci/pci.h）     

整个驱动的注册后触发使能的过程如上。这里核心位于bus_for_each_dev

int bus_for_each_dev(struct bus_type *bus, struct device *start,
		     void *data, int (*fn)(struct device *, void *))
{
   
   
	struct klist_iter i;
	struct device *dev;
	int error = 0;

	if (!bus || !bus->p)