1 #include <linux/pci.h> 2 #include <linux/module.h> 3 #include <linux/pci-aspm.h> 4 #include "pci.h" 5 6 static void pci_free_resources(struct pci_dev *dev) 7 { 8 int i; 9 10 pci_cleanup_rom(dev); 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 pci_proc_detach_device(dev); 24 pci_remove_sysfs_dev_files(dev); 25 device_release_driver(&dev->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_free_resources(dev); 45 put_device(&dev->dev); 46 } 47 48 void pci_remove_bus(struct pci_bus *bus) 49 { 50 pci_proc_detach_bus(bus); 51 52 down_write(&pci_bus_sem); 53 list_del(&bus->node); 54 pci_bus_release_busn_res(bus); 55 up_write(&pci_bus_sem); 56 pci_remove_legacy_files(bus); 57 pcibios_remove_bus(bus); 58 device_unregister(&bus->dev); 59 } 60 EXPORT_SYMBOL(pci_remove_bus); 61 62 static void pci_stop_bus_device(struct pci_dev *dev) 63 { 64 struct pci_bus *bus = dev->subordinate; 65 struct pci_dev *child, *tmp; 66 67 /* 68 * Stopping an SR-IOV PF device removes all the associated VFs, 69 * which will update the bus->devices list and confuse the 70 * iterator. Therefore, iterate in reverse so we remove the VFs 71 * first, then the PF. 72 */ 73 if (bus) { 74 list_for_each_entry_safe_reverse(child, tmp, 75 &bus->devices, bus_list) 76 pci_stop_bus_device(child); 77 } 78 79 pci_stop_dev(dev); 80 } 81 82 static void pci_remove_bus_device(struct pci_dev *dev) 83 { 84 struct pci_bus *bus = dev->subordinate; 85 struct pci_dev *child, *tmp; 86 87 if (bus) { 88 list_for_each_entry_safe(child, tmp, 89 &bus->devices, bus_list) 90 pci_remove_bus_device(child); 91 92 pci_remove_bus(bus); 93 dev->subordinate = NULL; 94 } 95 96 pci_destroy_dev(dev); 97 } 98 99 /** 100 * pci_stop_and_remove_bus_device - remove a PCI device and any children 101 * @dev: the device to remove 102 * 103 * Remove a PCI device from the device lists, informing the drivers 104 * that the device has been removed. We also remove any subordinate 105 * buses and children in a depth-first manner. 106 * 107 * For each device we remove, delete the device structure from the 108 * device lists, remove the /proc entry, and notify userspace 109 * (/sbin/hotplug). 110 */ 111 void pci_stop_and_remove_bus_device(struct pci_dev *dev) 112 { 113 pci_stop_bus_device(dev); 114 pci_remove_bus_device(dev); 115 } 116 EXPORT_SYMBOL(pci_stop_and_remove_bus_device); 117 118 void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev) 119 { 120 pci_lock_rescan_remove(); 121 pci_stop_and_remove_bus_device(dev); 122 pci_unlock_rescan_remove(); 123 } 124 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); 125 126 void pci_stop_root_bus(struct pci_bus *bus) 127 { 128 struct pci_dev *child, *tmp; 129 struct pci_host_bridge *host_bridge; 130 131 if (!pci_is_root_bus(bus)) 132 return; 133 134 host_bridge = to_pci_host_bridge(bus->bridge); 135 list_for_each_entry_safe_reverse(child, tmp, 136 &bus->devices, bus_list) 137 pci_stop_bus_device(child); 138 139 /* stop the host bridge */ 140 device_release_driver(&host_bridge->dev); 141 } 142 EXPORT_SYMBOL_GPL(pci_stop_root_bus); 143 144 void pci_remove_root_bus(struct pci_bus *bus) 145 { 146 struct pci_dev *child, *tmp; 147 struct pci_host_bridge *host_bridge; 148 149 if (!pci_is_root_bus(bus)) 150 return; 151 152 host_bridge = to_pci_host_bridge(bus->bridge); 153 list_for_each_entry_safe(child, tmp, 154 &bus->devices, bus_list) 155 pci_remove_bus_device(child); 156 pci_remove_bus(bus); 157 host_bridge->bus = NULL; 158 159 /* remove the host bridge */ 160 device_unregister(&host_bridge->dev); 161 } 162 EXPORT_SYMBOL_GPL(pci_remove_root_bus); 163