| 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 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
| 11 | struct resource *res = dev->resource + i; |
| 12 | if (res->parent) |
| 13 | release_resource(res); |
| 14 | } |
| 15 | } |
| 16 | |
| 17 | static void pci_stop_dev(struct pci_dev *dev) |
| 18 | { |
| 19 | pci_pme_active(dev, false); |
| 20 | |
| 21 | if (dev->is_added) { |
| 22 | pci_proc_detach_device(dev); |
| 23 | pci_remove_sysfs_dev_files(dev); |
| 24 | device_release_driver(&dev->dev); |
| 25 | dev->is_added = 0; |
| 26 | } |
| 27 | |
| 28 | if (dev->bus->self) |
| 29 | pcie_aspm_exit_link_state(dev); |
| 30 | } |
| 31 | |
| 32 | static void pci_destroy_dev(struct pci_dev *dev) |
| 33 | { |
| 34 | if (!dev->dev.kobj.parent) |
| 35 | return; |
| 36 | |
| 37 | device_del(&dev->dev); |
| 38 | |
| 39 | down_write(&pci_bus_sem); |
| 40 | list_del(&dev->bus_list); |
| 41 | up_write(&pci_bus_sem); |
| 42 | |
| 43 | pci_free_resources(dev); |
| 44 | put_device(&dev->dev); |
| 45 | } |
| 46 | |
| 47 | void pci_remove_bus(struct pci_bus *bus) |
| 48 | { |
| 49 | pci_proc_detach_bus(bus); |
| 50 | |
| 51 | down_write(&pci_bus_sem); |
| 52 | list_del(&bus->node); |
| 53 | pci_bus_release_busn_res(bus); |
| 54 | up_write(&pci_bus_sem); |
| 55 | pci_remove_legacy_files(bus); |
| 56 | |
| 57 | if (bus->ops->remove_bus) |
| 58 | bus->ops->remove_bus(bus); |
| 59 | |
| 60 | pcibios_remove_bus(bus); |
| 61 | device_unregister(&bus->dev); |
| 62 | } |
| 63 | EXPORT_SYMBOL(pci_remove_bus); |
| 64 | |
| 65 | static void pci_stop_bus_device(struct pci_dev *dev) |
| 66 | { |
| 67 | struct pci_bus *bus = dev->subordinate; |
| 68 | struct pci_dev *child, *tmp; |
| 69 | |
| 70 | /* |
| 71 | * Stopping an SR-IOV PF device removes all the associated VFs, |
| 72 | * which will update the bus->devices list and confuse the |
| 73 | * iterator. Therefore, iterate in reverse so we remove the VFs |
| 74 | * first, then the PF. |
| 75 | */ |
| 76 | if (bus) { |
| 77 | list_for_each_entry_safe_reverse(child, tmp, |
| 78 | &bus->devices, bus_list) |
| 79 | pci_stop_bus_device(child); |
| 80 | } |
| 81 | |
| 82 | pci_stop_dev(dev); |
| 83 | } |
| 84 | |
| 85 | static void pci_remove_bus_device(struct pci_dev *dev) |
| 86 | { |
| 87 | struct pci_bus *bus = dev->subordinate; |
| 88 | struct pci_dev *child, *tmp; |
| 89 | |
| 90 | if (bus) { |
| 91 | list_for_each_entry_safe(child, tmp, |
| 92 | &bus->devices, bus_list) |
| 93 | pci_remove_bus_device(child); |
| 94 | |
| 95 | pci_remove_bus(bus); |
| 96 | dev->subordinate = NULL; |
| 97 | } |
| 98 | |
| 99 | pci_bridge_d3_device_removed(dev); |
| 100 | |
| 101 | pci_destroy_dev(dev); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * pci_stop_and_remove_bus_device - remove a PCI device and any children |
| 106 | * @dev: the device to remove |
| 107 | * |
| 108 | * Remove a PCI device from the device lists, informing the drivers |
| 109 | * that the device has been removed. We also remove any subordinate |
| 110 | * buses and children in a depth-first manner. |
| 111 | * |
| 112 | * For each device we remove, delete the device structure from the |
| 113 | * device lists, remove the /proc entry, and notify userspace |
| 114 | * (/sbin/hotplug). |
| 115 | */ |
| 116 | void pci_stop_and_remove_bus_device(struct pci_dev *dev) |
| 117 | { |
| 118 | pci_stop_bus_device(dev); |
| 119 | pci_remove_bus_device(dev); |
| 120 | } |
| 121 | EXPORT_SYMBOL(pci_stop_and_remove_bus_device); |
| 122 | |
| 123 | void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev) |
| 124 | { |
| 125 | pci_lock_rescan_remove(); |
| 126 | pci_stop_and_remove_bus_device(dev); |
| 127 | pci_unlock_rescan_remove(); |
| 128 | } |
| 129 | EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); |
| 130 | |
| 131 | void pci_stop_root_bus(struct pci_bus *bus) |
| 132 | { |
| 133 | struct pci_dev *child, *tmp; |
| 134 | struct pci_host_bridge *host_bridge; |
| 135 | |
| 136 | if (!pci_is_root_bus(bus)) |
| 137 | return; |
| 138 | |
| 139 | host_bridge = to_pci_host_bridge(bus->bridge); |
| 140 | list_for_each_entry_safe_reverse(child, tmp, |
| 141 | &bus->devices, bus_list) |
| 142 | pci_stop_bus_device(child); |
| 143 | |
| 144 | /* stop the host bridge */ |
| 145 | device_release_driver(&host_bridge->dev); |
| 146 | } |
| 147 | EXPORT_SYMBOL_GPL(pci_stop_root_bus); |
| 148 | |
| 149 | void pci_remove_root_bus(struct pci_bus *bus) |
| 150 | { |
| 151 | struct pci_dev *child, *tmp; |
| 152 | struct pci_host_bridge *host_bridge; |
| 153 | |
| 154 | if (!pci_is_root_bus(bus)) |
| 155 | return; |
| 156 | |
| 157 | host_bridge = to_pci_host_bridge(bus->bridge); |
| 158 | list_for_each_entry_safe(child, tmp, |
| 159 | &bus->devices, bus_list) |
| 160 | pci_remove_bus_device(child); |
| 161 | pci_remove_bus(bus); |
| 162 | host_bridge->bus = NULL; |
| 163 | |
| 164 | /* remove the host bridge */ |
| 165 | device_unregister(&host_bridge->dev); |
| 166 | } |
| 167 | EXPORT_SYMBOL_GPL(pci_remove_root_bus); |