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 pci_remove_legacy_files(pci_bus); 75 device_remove_file(&pci_bus->dev, &dev_attr_cpuaffinity); 76 device_unregister(&pci_bus->dev); 77 } 78 EXPORT_SYMBOL(pci_remove_bus); 79 80 /** 81 * pci_remove_bus_device - remove a PCI device and any children 82 * @dev: the device to remove 83 * 84 * Remove a PCI device from the device lists, informing the drivers 85 * that the device has been removed. We also remove any subordinate 86 * buses and children in a depth-first manner. 87 * 88 * For each device we remove, delete the device structure from the 89 * device lists, remove the /proc entry, and notify userspace 90 * (/sbin/hotplug). 91 */ 92 void pci_remove_bus_device(struct pci_dev *dev) 93 { 94 if (dev->subordinate) { 95 struct pci_bus *b = dev->subordinate; 96 97 pci_remove_behind_bridge(dev); 98 pci_remove_bus(b); 99 dev->subordinate = NULL; 100 } 101 102 pci_destroy_dev(dev); 103 } 104 105 /** 106 * pci_remove_behind_bridge - remove all devices behind a PCI bridge 107 * @dev: PCI bridge device 108 * 109 * Remove all devices on the bus, except for the parent bridge. 110 * This also removes any child buses, and any devices they may 111 * contain in a depth-first manner. 112 */ 113 void pci_remove_behind_bridge(struct pci_dev *dev) 114 { 115 struct list_head *l, *n; 116 117 if (dev->subordinate) { 118 list_for_each_safe(l, n, &dev->subordinate->devices) { 119 struct pci_dev *dev = pci_dev_b(l); 120 121 pci_remove_bus_device(dev); 122 } 123 } 124 } 125 126 static void pci_stop_bus_devices(struct pci_bus *bus) 127 { 128 struct list_head *l, *n; 129 130 list_for_each_safe(l, n, &bus->devices) { 131 struct pci_dev *dev = pci_dev_b(l); 132 pci_stop_bus_device(dev); 133 } 134 } 135 136 /** 137 * pci_stop_bus_device - stop a PCI device and any children 138 * @dev: the device to stop 139 * 140 * Stop a PCI device (detach the driver, remove from the global list 141 * and so on). This also stop any subordinate buses and children in a 142 * depth-first manner. 143 */ 144 void pci_stop_bus_device(struct pci_dev *dev) 145 { 146 if (dev->subordinate) 147 pci_stop_bus_devices(dev->subordinate); 148 149 pci_stop_dev(dev); 150 } 151 152 EXPORT_SYMBOL(pci_remove_bus_device); 153 EXPORT_SYMBOL(pci_remove_behind_bridge); 154 EXPORT_SYMBOL_GPL(pci_stop_bus_device); 155