// SPDX-License-Identifier: GPL-2.0#include <linux/pci.h>#include <linux/module.h>#include <linux/of.h>#include <linux/of_platform.h>#include <linux/platform_device.h> #include "pci.h" static void pci_free_resources(struct pci_dev *dev){	struct resource *res; 	pci_dev_for_each_resource(dev, res) {		if (res->parent)			release_resource(res);	}} static void pci_stop_dev(struct pci_dev *dev){	pci_pme_active(dev, false); 	if (!pci_dev_test_and_clear_added(dev))		return; 	device_release_driver(&dev->dev);	pci_proc_detach_device(dev);	of_pci_remove_node(dev);} static void pci_destroy_dev(struct pci_dev *dev){	if (pci_dev_test_and_set_removed(dev))		return; 	platform_pci_remove_wake(dev);	pci_doe_sysfs_teardown(dev);	pci_npem_remove(dev); 	/*	 * While device is in D0 drop the device from TSM link operations	 * including unbind and disconnect (IDE + SPDM teardown).	 */	pci_tsm_destroy(dev); 	device_del(&dev->dev); 	down_write(&pci_bus_sem);	list_del(&dev->bus_list);	up_write(&pci_bus_sem); 	pci_doe_destroy(dev);	pci_ide_destroy(dev);	pcie_aspm_exit_link_state(dev);	pci_bridge_d3_update(dev);	pci_free_resources(dev);	put_device(&dev->dev);} void pci_remove_bus(struct pci_bus *bus){	pci_proc_detach_bus(bus); 	down_write(&pci_bus_sem);	list_del(&bus->node);	pci_bus_release_busn_res(bus);	up_write(&pci_bus_sem);	if (bus->ops->remove_bus)		bus->ops->remove_bus(bus); 	pcibios_remove_bus(bus);	device_unregister(&bus->dev);}EXPORT_SYMBOL(pci_remove_bus); static void pci_stop_bus_device(struct pci_dev *dev){	struct pci_bus *bus = dev->subordinate;	struct pci_dev *child, *tmp; 	/*	 * Stopping an SR-IOV PF device removes all the associated VFs,	 * which will update the bus->devices list and confuse the	 * iterator.  Therefore, iterate in reverse so we remove the VFs	 * first, then the PF.	 */	if (bus) {		list_for_each_entry_safe_reverse(child, tmp,						 &bus->devices, bus_list)			pci_stop_bus_device(child);	} 	pci_stop_dev(dev);} static void pci_remove_bus_device(struct pci_dev *dev){	struct pci_bus *bus = dev->subordinate;	struct pci_dev *child, *tmp; 	if (bus) {		list_for_each_entry_safe(child, tmp,					 &bus->devices, bus_list)			pci_remove_bus_device(child); 		pci_remove_bus(bus);		dev->subordinate = NULL;	} 	pci_destroy_dev(dev);} /** * pci_stop_and_remove_bus_device - remove a PCI device and any children * @dev: the device to remove * * Remove a PCI device from the device lists, informing the drivers * that the device has been removed.  We also remove any subordinate * buses and children in a depth-first manner. * * For each device we remove, delete the device structure from the * device lists, remove the /proc entry, and notify userspace * (/sbin/hotplug). */void pci_stop_and_remove_bus_device(struct pci_dev *dev){	lockdep_assert_held(&pci_rescan_remove_lock);	pci_stop_bus_device(dev);	pci_remove_bus_device(dev);}EXPORT_SYMBOL(pci_stop_and_remove_bus_device); void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev){	pci_lock_rescan_remove();	pci_stop_and_remove_bus_device(dev);	pci_unlock_rescan_remove();}EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); void pci_stop_root_bus(struct pci_bus *bus){	struct pci_dev *child, *tmp;	struct pci_host_bridge *host_bridge; 	if (!pci_is_root_bus(bus))		return; 	host_bridge = to_pci_host_bridge(bus->bridge);	list_for_each_entry_safe_reverse(child, tmp,					 &bus->devices, bus_list)		pci_stop_bus_device(child); 	of_pci_remove_host_bridge_node(host_bridge); 	/* stop the host bridge */	device_release_driver(&host_bridge->dev);}EXPORT_SYMBOL_GPL(pci_stop_root_bus); void pci_remove_root_bus(struct pci_bus *bus){	struct pci_dev *child, *tmp;	struct pci_host_bridge *host_bridge; 	if (!pci_is_root_bus(bus))		return; 	host_bridge = to_pci_host_bridge(bus->bridge);	list_for_each_entry_safe(child, tmp,				 &bus->devices, bus_list)		pci_remove_bus_device(child); #ifdef CONFIG_PCI_DOMAINS_GENERIC	/* Release domain_nr if it was dynamically allocated */	if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)		pci_bus_release_domain_nr(host_bridge->dev.parent, bus->domain_nr);#endif 	pci_remove_bus(bus);	host_bridge->bus = NULL; 	/* remove the host bridge */	device_del(&host_bridge->dev);}EXPORT_SYMBOL_GPL(pci_remove_root_bus);