1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/pci.h> 3 #include <linux/module.h> 4 #include "pci.h" 5 6 static void pci_free_resources(struct pci_dev *dev) 7 { 8 int i; 9 10 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 11 struct resource *res = dev->resource + i; 12 if (res->parent) 13 release_resource(res); 14 } 15 } 16 17 static void pci_stop_dev(struct pci_dev *dev) 18 { 19 pci_pme_active(dev, false); 20 21 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 26 pci_dev_assign_added(dev, false); 27 } 28 } 29 30 static void pci_destroy_dev(struct pci_dev *dev) 31 { 32 if (!dev->dev.kobj.parent) 33 return; 34 35 device_del(&dev->dev); 36 37 down_write(&pci_bus_sem); 38 list_del(&dev->bus_list); 39 up_write(&pci_bus_sem); 40 41 pcie_aspm_exit_link_state(dev); 42 pci_bridge_d3_update(dev); 43 pci_free_resources(dev); 44 put_device(&dev->dev); 45 } 46 47 void pci_remove_bus(struct pci_bus *bus) 48 { 49 pci_proc_detach_bus(bus); 50 51 down_write(&pci_bus_sem); 52 list_del(&bus->node); 53 pci_bus_release_busn_res(bus); 54 up_write(&pci_bus_sem); 55 pci_remove_legacy_files(bus); 56 57 if (bus->ops->remove_bus) 58 bus->ops->remove_bus(bus); 59 60 pcibios_remove_bus(bus); 61 device_unregister(&bus->dev); 62 } 63 EXPORT_SYMBOL(pci_remove_bus); 64 65 static void pci_stop_bus_device(struct pci_dev *dev) 66 { 67 struct pci_bus *bus = dev->subordinate; 68 struct pci_dev *child, *tmp; 69 70 /* 71 * Stopping an SR-IOV PF device removes all the associated VFs, 72 * which will update the bus->devices list and confuse the 73 * iterator. Therefore, iterate in reverse so we remove the VFs 74 * first, then the PF. 75 */ 76 if (bus) { 77 list_for_each_entry_safe_reverse(child, tmp, 78 &bus->devices, bus_list) 79 pci_stop_bus_device(child); 80 } 81 82 pci_stop_dev(dev); 83 } 84 85 static void pci_remove_bus_device(struct pci_dev *dev) 86 { 87 struct pci_bus *bus = dev->subordinate; 88 struct pci_dev *child, *tmp; 89 90 if (bus) { 91 list_for_each_entry_safe(child, tmp, 92 &bus->devices, bus_list) 93 pci_remove_bus_device(child); 94 95 pci_remove_bus(bus); 96 dev->subordinate = NULL; 97 } 98 99 pci_destroy_dev(dev); 100 } 101 102 /** 103 * pci_stop_and_remove_bus_device - remove a PCI device and any children 104 * @dev: the device to remove 105 * 106 * Remove a PCI device from the device lists, informing the drivers 107 * that the device has been removed. We also remove any subordinate 108 * buses and children in a depth-first manner. 109 * 110 * For each device we remove, delete the device structure from the 111 * device lists, remove the /proc entry, and notify userspace 112 * (/sbin/hotplug). 113 */ 114 void pci_stop_and_remove_bus_device(struct pci_dev *dev) 115 { 116 pci_stop_bus_device(dev); 117 pci_remove_bus_device(dev); 118 } 119 EXPORT_SYMBOL(pci_stop_and_remove_bus_device); 120 121 void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev) 122 { 123 pci_lock_rescan_remove(); 124 pci_stop_and_remove_bus_device(dev); 125 pci_unlock_rescan_remove(); 126 } 127 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); 128 129 void pci_stop_root_bus(struct pci_bus *bus) 130 { 131 struct pci_dev *child, *tmp; 132 struct pci_host_bridge *host_bridge; 133 134 if (!pci_is_root_bus(bus)) 135 return; 136 137 host_bridge = to_pci_host_bridge(bus->bridge); 138 list_for_each_entry_safe_reverse(child, tmp, 139 &bus->devices, bus_list) 140 pci_stop_bus_device(child); 141 142 /* stop the host bridge */ 143 device_release_driver(&host_bridge->dev); 144 } 145 EXPORT_SYMBOL_GPL(pci_stop_root_bus); 146 147 void pci_remove_root_bus(struct pci_bus *bus) 148 { 149 struct pci_dev *child, *tmp; 150 struct pci_host_bridge *host_bridge; 151 152 if (!pci_is_root_bus(bus)) 153 return; 154 155 host_bridge = to_pci_host_bridge(bus->bridge); 156 list_for_each_entry_safe(child, tmp, 157 &bus->devices, bus_list) 158 pci_remove_bus_device(child); 159 pci_remove_bus(bus); 160 host_bridge->bus = NULL; 161 162 /* remove the host bridge */ 163 device_unregister(&host_bridge->dev); 164 } 165 EXPORT_SYMBOL_GPL(pci_remove_root_bus); 166