1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/pci.h> 3 #include <linux/module.h> 4 #include <linux/pci-aspm.h> 5 #include "pci.h" 6 7 static void pci_free_resources(struct pci_dev *dev) 8 { 9 int i; 10 11 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 12 struct resource *res = dev->resource + i; 13 if (res->parent) 14 release_resource(res); 15 } 16 } 17 18 static void pci_stop_dev(struct pci_dev *dev) 19 { 20 pci_pme_active(dev, false); 21 22 if (dev->is_added) { 23 device_release_driver(&dev->dev); 24 pci_proc_detach_device(dev); 25 pci_remove_sysfs_dev_files(dev); 26 dev->is_added = 0; 27 } 28 29 if (dev->bus->self) 30 pcie_aspm_exit_link_state(dev); 31 } 32 33 static void pci_destroy_dev(struct pci_dev *dev) 34 { 35 if (!dev->dev.kobj.parent) 36 return; 37 38 device_del(&dev->dev); 39 40 down_write(&pci_bus_sem); 41 list_del(&dev->bus_list); 42 up_write(&pci_bus_sem); 43 44 pci_bridge_d3_update(dev); 45 pci_free_resources(dev); 46 put_device(&dev->dev); 47 } 48 49 void pci_remove_bus(struct pci_bus *bus) 50 { 51 pci_proc_detach_bus(bus); 52 53 down_write(&pci_bus_sem); 54 list_del(&bus->node); 55 pci_bus_release_busn_res(bus); 56 up_write(&pci_bus_sem); 57 pci_remove_legacy_files(bus); 58 59 if (bus->ops->remove_bus) 60 bus->ops->remove_bus(bus); 61 62 pcibios_remove_bus(bus); 63 device_unregister(&bus->dev); 64 } 65 EXPORT_SYMBOL(pci_remove_bus); 66 67 static void pci_stop_bus_device(struct pci_dev *dev) 68 { 69 struct pci_bus *bus = dev->subordinate; 70 struct pci_dev *child, *tmp; 71 72 /* 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 76 * first, then the PF. 77 */ 78 if (bus) { 79 list_for_each_entry_safe_reverse(child, tmp, 80 &bus->devices, bus_list) 81 pci_stop_bus_device(child); 82 } 83 84 pci_stop_dev(dev); 85 } 86 87 static void pci_remove_bus_device(struct pci_dev *dev) 88 { 89 struct pci_bus *bus = dev->subordinate; 90 struct pci_dev *child, *tmp; 91 92 if (bus) { 93 list_for_each_entry_safe(child, tmp, 94 &bus->devices, bus_list) 95 pci_remove_bus_device(child); 96 97 pci_remove_bus(bus); 98 dev->subordinate = NULL; 99 } 100 101 pci_destroy_dev(dev); 102 } 103 104 /** 105 * pci_stop_and_remove_bus_device - remove a PCI device and any children 106 * @dev: the device to remove 107 * 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. 111 * 112 * For each device we remove, delete the device structure from the 113 * device lists, remove the /proc entry, and notify userspace 114 * (/sbin/hotplug). 115 */ 116 void pci_stop_and_remove_bus_device(struct pci_dev *dev) 117 { 118 pci_stop_bus_device(dev); 119 pci_remove_bus_device(dev); 120 } 121 EXPORT_SYMBOL(pci_stop_and_remove_bus_device); 122 123 void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev) 124 { 125 pci_lock_rescan_remove(); 126 pci_stop_and_remove_bus_device(dev); 127 pci_unlock_rescan_remove(); 128 } 129 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); 130 131 void pci_stop_root_bus(struct pci_bus *bus) 132 { 133 struct pci_dev *child, *tmp; 134 struct pci_host_bridge *host_bridge; 135 136 if (!pci_is_root_bus(bus)) 137 return; 138 139 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); 143 144 /* stop the host bridge */ 145 device_release_driver(&host_bridge->dev); 146 } 147 EXPORT_SYMBOL_GPL(pci_stop_root_bus); 148 149 void pci_remove_root_bus(struct pci_bus *bus) 150 { 151 struct pci_dev *child, *tmp; 152 struct pci_host_bridge *host_bridge; 153 154 if (!pci_is_root_bus(bus)) 155 return; 156 157 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); 161 pci_remove_bus(bus); 162 host_bridge->bus = NULL; 163 164 /* remove the host bridge */ 165 device_unregister(&host_bridge->dev); 166 } 167 EXPORT_SYMBOL_GPL(pci_remove_root_bus); 168