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