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 pci_bus_release_busn_res(pci_bus); 72 up_write(&pci_bus_sem); 73 if (!pci_bus->is_added) 74 return; 75 76 pci_remove_legacy_files(pci_bus); 77 device_unregister(&pci_bus->dev); 78 } 79 EXPORT_SYMBOL(pci_remove_bus); 80 81 static void __pci_remove_behind_bridge(struct pci_dev *dev); 82 /** 83 * pci_stop_and_remove_bus_device - remove a PCI device and any children 84 * @dev: the device to remove 85 * 86 * Remove a PCI device from the device lists, informing the drivers 87 * that the device has been removed. We also remove any subordinate 88 * buses and children in a depth-first manner. 89 * 90 * For each device we remove, delete the device structure from the 91 * device lists, remove the /proc entry, and notify userspace 92 * (/sbin/hotplug). 93 */ 94 void __pci_remove_bus_device(struct pci_dev *dev) 95 { 96 if (dev->subordinate) { 97 struct pci_bus *b = dev->subordinate; 98 99 __pci_remove_behind_bridge(dev); 100 pci_remove_bus(b); 101 dev->subordinate = NULL; 102 } 103 104 pci_destroy_dev(dev); 105 } 106 EXPORT_SYMBOL(__pci_remove_bus_device); 107 108 void pci_stop_and_remove_bus_device(struct pci_dev *dev) 109 { 110 pci_stop_bus_device(dev); 111 __pci_remove_bus_device(dev); 112 } 113 114 static void __pci_remove_behind_bridge(struct pci_dev *dev) 115 { 116 struct list_head *l, *n; 117 118 if (dev->subordinate) 119 list_for_each_safe(l, n, &dev->subordinate->devices) 120 __pci_remove_bus_device(pci_dev_b(l)); 121 } 122 123 static void pci_stop_behind_bridge(struct pci_dev *dev) 124 { 125 struct list_head *l, *n; 126 127 if (dev->subordinate) 128 list_for_each_safe(l, n, &dev->subordinate->devices) 129 pci_stop_bus_device(pci_dev_b(l)); 130 } 131 132 /** 133 * pci_stop_and_remove_behind_bridge - stop and remove all devices behind 134 * a PCI bridge 135 * @dev: PCI bridge device 136 * 137 * Remove all devices on the bus, except for the parent bridge. 138 * This also removes any child buses, and any devices they may 139 * contain in a depth-first manner. 140 */ 141 void pci_stop_and_remove_behind_bridge(struct pci_dev *dev) 142 { 143 pci_stop_behind_bridge(dev); 144 __pci_remove_behind_bridge(dev); 145 } 146 147 static void pci_stop_bus_devices(struct pci_bus *bus) 148 { 149 struct list_head *l, *n; 150 151 /* 152 * VFs could be removed by pci_stop_and_remove_bus_device() in the 153 * pci_stop_bus_devices() code path for PF. 154 * aka, bus->devices get updated in the process. 155 * but VFs are inserted after PFs when SRIOV is enabled for PF, 156 * We can iterate the list backwards to get prev valid PF instead 157 * of removed VF. 158 */ 159 list_for_each_prev_safe(l, n, &bus->devices) { 160 struct pci_dev *dev = pci_dev_b(l); 161 pci_stop_bus_device(dev); 162 } 163 } 164 165 /** 166 * pci_stop_bus_device - stop a PCI device and any children 167 * @dev: the device to stop 168 * 169 * Stop a PCI device (detach the driver, remove from the global list 170 * and so on). This also stop any subordinate buses and children in a 171 * depth-first manner. 172 */ 173 void pci_stop_bus_device(struct pci_dev *dev) 174 { 175 if (dev->subordinate) 176 pci_stop_bus_devices(dev->subordinate); 177 178 pci_stop_dev(dev); 179 } 180 181 EXPORT_SYMBOL(pci_stop_and_remove_bus_device); 182 EXPORT_SYMBOL(pci_stop_and_remove_behind_bridge); 183 EXPORT_SYMBOL_GPL(pci_stop_bus_device); 184