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 msi_remove_pci_irq_vectors(dev); 11 12 pci_cleanup_rom(dev); 13 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 14 struct resource *res = dev->resource + i; 15 if (res->parent) 16 release_resource(res); 17 } 18 } 19 20 static void pci_stop_dev(struct pci_dev *dev) 21 { 22 if (dev->is_added) { 23 pci_proc_detach_device(dev); 24 pci_remove_sysfs_dev_files(dev); 25 device_unregister(&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 /* Remove the device from the device lists, and prevent any further 36 * list accesses from this device */ 37 down_write(&pci_bus_sem); 38 list_del(&dev->bus_list); 39 dev->bus_list.next = dev->bus_list.prev = NULL; 40 up_write(&pci_bus_sem); 41 42 pci_free_resources(dev); 43 pci_dev_put(dev); 44 } 45 46 /** 47 * pci_remove_device_safe - remove an unused hotplug device 48 * @dev: the device to remove 49 * 50 * Delete the device structure from the device lists and 51 * notify userspace (/sbin/hotplug), but only if the device 52 * in question is not being used by a driver. 53 * Returns 0 on success. 54 */ 55 #if 0 56 int pci_remove_device_safe(struct pci_dev *dev) 57 { 58 if (pci_dev_driver(dev)) 59 return -EBUSY; 60 pci_destroy_dev(dev); 61 return 0; 62 } 63 #endif /* 0 */ 64 65 void pci_remove_bus(struct pci_bus *pci_bus) 66 { 67 pci_proc_detach_bus(pci_bus); 68 69 down_write(&pci_bus_sem); 70 list_del(&pci_bus->node); 71 up_write(&pci_bus_sem); 72 if (!pci_bus->is_added) 73 return; 74 75 pci_remove_legacy_files(pci_bus); 76 device_unregister(&pci_bus->dev); 77 } 78 EXPORT_SYMBOL(pci_remove_bus); 79 80 static void __pci_remove_behind_bridge(struct pci_dev *dev); 81 /** 82 * pci_remove_bus_device - remove a PCI device and any children 83 * @dev: the device to remove 84 * 85 * Remove a PCI device from the device lists, informing the drivers 86 * that the device has been removed. We also remove any subordinate 87 * buses and children in a depth-first manner. 88 * 89 * For each device we remove, delete the device structure from the 90 * device lists, remove the /proc entry, and notify userspace 91 * (/sbin/hotplug). 92 */ 93 static void __pci_remove_bus_device(struct pci_dev *dev) 94 { 95 if (dev->subordinate) { 96 struct pci_bus *b = dev->subordinate; 97 98 __pci_remove_behind_bridge(dev); 99 pci_remove_bus(b); 100 dev->subordinate = NULL; 101 } 102 103 pci_destroy_dev(dev); 104 } 105 void pci_remove_bus_device(struct pci_dev *dev) 106 { 107 pci_stop_bus_device(dev); 108 __pci_remove_bus_device(dev); 109 } 110 111 static void __pci_remove_behind_bridge(struct pci_dev *dev) 112 { 113 struct list_head *l, *n; 114 115 if (dev->subordinate) 116 list_for_each_safe(l, n, &dev->subordinate->devices) 117 __pci_remove_bus_device(pci_dev_b(l)); 118 } 119 120 static void pci_stop_behind_bridge(struct pci_dev *dev) 121 { 122 struct list_head *l, *n; 123 124 if (dev->subordinate) 125 list_for_each_safe(l, n, &dev->subordinate->devices) 126 pci_stop_bus_device(pci_dev_b(l)); 127 } 128 129 /** 130 * pci_remove_behind_bridge - remove all devices behind a PCI bridge 131 * @dev: PCI bridge device 132 * 133 * Remove all devices on the bus, except for the parent bridge. 134 * This also removes any child buses, and any devices they may 135 * contain in a depth-first manner. 136 */ 137 void pci_remove_behind_bridge(struct pci_dev *dev) 138 { 139 pci_stop_behind_bridge(dev); 140 __pci_remove_behind_bridge(dev); 141 } 142 143 static void pci_stop_bus_devices(struct pci_bus *bus) 144 { 145 struct list_head *l, *n; 146 147 list_for_each_safe(l, n, &bus->devices) { 148 struct pci_dev *dev = pci_dev_b(l); 149 pci_stop_bus_device(dev); 150 } 151 } 152 153 /** 154 * pci_stop_bus_device - stop a PCI device and any children 155 * @dev: the device to stop 156 * 157 * Stop a PCI device (detach the driver, remove from the global list 158 * and so on). This also stop any subordinate buses and children in a 159 * depth-first manner. 160 */ 161 void pci_stop_bus_device(struct pci_dev *dev) 162 { 163 if (dev->subordinate) 164 pci_stop_bus_devices(dev->subordinate); 165 166 pci_stop_dev(dev); 167 } 168 169 EXPORT_SYMBOL(pci_remove_bus_device); 170 EXPORT_SYMBOL(pci_remove_behind_bridge); 171 EXPORT_SYMBOL_GPL(pci_stop_bus_device); 172