1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/module.h>
6 static void pci_free_resources(struct pci_dev *dev)
10 pci_dev_for_each_resource(dev, res) {
12 release_resource(res);
16 static void pci_stop_dev(struct pci_dev *dev)
18 pci_pme_active(dev, false);
20 if (pci_dev_is_added(dev)) {
22 device_release_driver(&dev->dev);
23 pci_proc_detach_device(dev);
24 pci_remove_sysfs_dev_files(dev);
25 of_pci_remove_node(dev);
27 pci_dev_assign_added(dev, false);
31 static void pci_destroy_dev(struct pci_dev *dev)
33 if (!dev->dev.kobj.parent)
36 device_del(&dev->dev);
38 down_write(&pci_bus_sem);
39 list_del(&dev->bus_list);
40 up_write(&pci_bus_sem);
43 pcie_aspm_exit_link_state(dev);
44 pci_bridge_d3_update(dev);
45 pci_free_resources(dev);
46 put_device(&dev->dev);
49 void pci_remove_bus(struct pci_bus *bus)
51 pci_proc_detach_bus(bus);
53 down_write(&pci_bus_sem);
55 pci_bus_release_busn_res(bus);
56 up_write(&pci_bus_sem);
57 pci_remove_legacy_files(bus);
59 if (bus->ops->remove_bus)
60 bus->ops->remove_bus(bus);
62 pcibios_remove_bus(bus);
63 device_unregister(&bus->dev);
65 EXPORT_SYMBOL(pci_remove_bus);
67 static void pci_stop_bus_device(struct pci_dev *dev)
69 struct pci_bus *bus = dev->subordinate;
70 struct pci_dev *child, *tmp;
73 * Stopping an SR-IOV PF device removes all the associated VFs,
74 * which will update the bus->devices list and confuse the
75 * iterator. Therefore, iterate in reverse so we remove the VFs
79 list_for_each_entry_safe_reverse(child, tmp,
80 &bus->devices, bus_list)
81 pci_stop_bus_device(child);
87 static void pci_remove_bus_device(struct pci_dev *dev)
89 struct pci_bus *bus = dev->subordinate;
90 struct pci_dev *child, *tmp;
93 list_for_each_entry_safe(child, tmp,
94 &bus->devices, bus_list)
95 pci_remove_bus_device(child);
98 dev->subordinate = NULL;
101 pci_destroy_dev(dev);
105 * pci_stop_and_remove_bus_device - remove a PCI device and any children
106 * @dev: the device to remove
108 * Remove a PCI device from the device lists, informing the drivers
109 * that the device has been removed. We also remove any subordinate
110 * buses and children in a depth-first manner.
112 * For each device we remove, delete the device structure from the
113 * device lists, remove the /proc entry, and notify userspace
116 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
118 pci_stop_bus_device(dev);
119 pci_remove_bus_device(dev);
121 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
123 void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
125 pci_lock_rescan_remove();
126 pci_stop_and_remove_bus_device(dev);
127 pci_unlock_rescan_remove();
129 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
131 void pci_stop_root_bus(struct pci_bus *bus)
133 struct pci_dev *child, *tmp;
134 struct pci_host_bridge *host_bridge;
136 if (!pci_is_root_bus(bus))
139 host_bridge = to_pci_host_bridge(bus->bridge);
140 list_for_each_entry_safe_reverse(child, tmp,
141 &bus->devices, bus_list)
142 pci_stop_bus_device(child);
144 /* stop the host bridge */
145 device_release_driver(&host_bridge->dev);
147 EXPORT_SYMBOL_GPL(pci_stop_root_bus);
149 void pci_remove_root_bus(struct pci_bus *bus)
151 struct pci_dev *child, *tmp;
152 struct pci_host_bridge *host_bridge;
154 if (!pci_is_root_bus(bus))
157 host_bridge = to_pci_host_bridge(bus->bridge);
158 list_for_each_entry_safe(child, tmp,
159 &bus->devices, bus_list)
160 pci_remove_bus_device(child);
162 #ifdef CONFIG_PCI_DOMAINS_GENERIC
163 /* Release domain_nr if it was dynamically allocated */
164 if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
165 pci_bus_release_domain_nr(bus, host_bridge->dev.parent);
169 host_bridge->bus = NULL;
171 /* remove the host bridge */
172 device_del(&host_bridge->dev);
174 EXPORT_SYMBOL_GPL(pci_remove_root_bus);