#include <linux/pci.h>#include <linux/module.h>#include <linux/pci-aspm.h>#include "pci.h" static void pci_free_resources(struct pci_dev *dev){	int i;  	msi_remove_pci_irq_vectors(dev); 	pci_cleanup_rom(dev);	for (i = 0; i < PCI_NUM_RESOURCES; i++) {		struct resource *res = dev->resource + i;		if (res->parent)			release_resource(res);	}} static void pci_stop_dev(struct pci_dev *dev){	if (dev->is_added) {		pci_proc_detach_device(dev);		pci_remove_sysfs_dev_files(dev);		device_unregister(&dev->dev);		dev->is_added = 0;	} 	if (dev->bus->self)		pcie_aspm_exit_link_state(dev);} static void pci_destroy_dev(struct pci_dev *dev){	/* Remove the device from the device lists, and prevent any further	 * list accesses from this device */	down_write(&pci_bus_sem);	list_del(&dev->bus_list);	dev->bus_list.next = dev->bus_list.prev = NULL;	up_write(&pci_bus_sem); 	pci_free_resources(dev);	pci_dev_put(dev);} /** * pci_remove_device_safe - remove an unused hotplug device * @dev: the device to remove * * Delete the device structure from the device lists and  * notify userspace (/sbin/hotplug), but only if the device * in question is not being used by a driver. * Returns 0 on success. */#if 0int pci_remove_device_safe(struct pci_dev *dev){	if (pci_dev_driver(dev))		return -EBUSY;	pci_destroy_dev(dev);	return 0;}#endif  /*  0  */ void pci_remove_bus(struct pci_bus *pci_bus){	pci_proc_detach_bus(pci_bus); 	down_write(&pci_bus_sem);	list_del(&pci_bus->node);	up_write(&pci_bus_sem);	if (!pci_bus->is_added)		return; 	pci_remove_legacy_files(pci_bus);	device_unregister(&pci_bus->dev);}EXPORT_SYMBOL(pci_remove_bus); static void __pci_remove_behind_bridge(struct pci_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_remove_bus_device(struct pci_dev *dev){	if (dev->subordinate) {		struct pci_bus *b = dev->subordinate; 		__pci_remove_behind_bridge(dev);		pci_remove_bus(b);		dev->subordinate = NULL;	} 	pci_destroy_dev(dev);}EXPORT_SYMBOL(__pci_remove_bus_device); void pci_stop_and_remove_bus_device(struct pci_dev *dev){	pci_stop_bus_device(dev);	__pci_remove_bus_device(dev);} static void __pci_remove_behind_bridge(struct pci_dev *dev){	struct list_head *l, *n; 	if (dev->subordinate)		list_for_each_safe(l, n, &dev->subordinate->devices)			__pci_remove_bus_device(pci_dev_b(l));} static void pci_stop_behind_bridge(struct pci_dev *dev){	struct list_head *l, *n; 	if (dev->subordinate)		list_for_each_safe(l, n, &dev->subordinate->devices)			pci_stop_bus_device(pci_dev_b(l));} /** * pci_stop_and_remove_behind_bridge - stop and remove all devices behind *					 a PCI bridge * @dev: PCI bridge device * * Remove all devices on the bus, except for the parent bridge. * This also removes any child buses, and any devices they may * contain in a depth-first manner. */void pci_stop_and_remove_behind_bridge(struct pci_dev *dev){	pci_stop_behind_bridge(dev);	__pci_remove_behind_bridge(dev);} static void pci_stop_bus_devices(struct pci_bus *bus){	struct list_head *l, *n; 	/*	 * VFs could be removed by pci_stop_and_remove_bus_device() in the	 *  pci_stop_bus_devices() code path for PF.	 *  aka, bus->devices get updated in the process.	 * but VFs are inserted after PFs when SRIOV is enabled for PF,	 * We can iterate the list backwards to get prev valid PF instead	 *  of removed VF.	 */	list_for_each_prev_safe(l, n, &bus->devices) {		struct pci_dev *dev = pci_dev_b(l);		pci_stop_bus_device(dev);	}} /** * pci_stop_bus_device - stop a PCI device and any children * @dev: the device to stop * * Stop a PCI device (detach the driver, remove from the global list * and so on). This also stop any subordinate buses and children in a * depth-first manner. */void pci_stop_bus_device(struct pci_dev *dev){	if (dev->subordinate)		pci_stop_bus_devices(dev->subordinate); 	pci_stop_dev(dev);} EXPORT_SYMBOL(pci_stop_and_remove_bus_device);EXPORT_SYMBOL(pci_stop_and_remove_behind_bridge);EXPORT_SYMBOL_GPL(pci_stop_bus_device);