drivers/pci/remove.c

   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                 device_release_driver(&dev->dev);
  23                 pci_proc_detach_device(dev);
  24                 pci_remove_sysfs_dev_files(dev);
  25                 dev->is_added = 0;
  26         }
  27 }
  28
  29 static void pci_destroy_dev(struct pci_dev *dev)
  30 {
  31         if (!dev->dev.kobj.parent)
  32                 return;
  33
  34         device_del(&dev->dev);
  35
  36         down_write(&pci_bus_sem);
  37         list_del(&dev->bus_list);
  38         up_write(&pci_bus_sem);
  39
  40         pcie_aspm_exit_link_state(dev);
  41         pci_bridge_d3_update(dev);
  42         pci_free_resources(dev);
  43         put_device(&dev->dev);
  44 }
  45
  46 void pci_remove_bus(struct pci_bus *bus)
  47 {
  48         pci_proc_detach_bus(bus);
  49
  50         down_write(&pci_bus_sem);
  51         list_del(&bus->node);
  52         pci_bus_release_busn_res(bus);
  53         up_write(&pci_bus_sem);
  54         pci_remove_legacy_files(bus);
  55
  56         if (bus->ops->remove_bus)
  57                 bus->ops->remove_bus(bus);
  58
  59         pcibios_remove_bus(bus);
  60         device_unregister(&bus->dev);
  61 }
  62 EXPORT_SYMBOL(pci_remove_bus);
  63
  64 static void pci_stop_bus_device(struct pci_dev *dev)
  65 {
  66         struct pci_bus *bus = dev->subordinate;
  67         struct pci_dev *child, *tmp;
  68
  69         /*
  70          * Stopping an SR-IOV PF device removes all the associated VFs,
  71          * which will update the bus->devices list and confuse the
  72          * iterator.  Therefore, iterate in reverse so we remove the VFs
  73          * first, then the PF.
  74          */
  75         if (bus) {
  76                 list_for_each_entry_safe_reverse(child, tmp,
  77                                                  &bus->devices, bus_list)
  78                         pci_stop_bus_device(child);
  79         }
  80
  81         pci_stop_dev(dev);
  82 }
  83
  84 static void pci_remove_bus_device(struct pci_dev *dev)
  85 {
  86         struct pci_bus *bus = dev->subordinate;
  87         struct pci_dev *child, *tmp;
  88
  89         if (bus) {
  90                 list_for_each_entry_safe(child, tmp,
  91                                          &bus->devices, bus_list)
  92                         pci_remove_bus_device(child);
  93
  94                 pci_remove_bus(bus);
  95                 dev->subordinate = NULL;
  96         }
  97
  98         pci_destroy_dev(dev);
  99 }
 100
 101 /**
 102  * pci_stop_and_remove_bus_device - remove a PCI device and any children
 103  * @dev: the device to remove
 104  *
 105  * Remove a PCI device from the device lists, informing the drivers
 106  * that the device has been removed.  We also remove any subordinate
 107  * buses and children in a depth-first manner.
 108  *
 109  * For each device we remove, delete the device structure from the
 110  * device lists, remove the /proc entry, and notify userspace
 111  * (/sbin/hotplug).
 112  */
 113 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 114 {
 115         pci_stop_bus_device(dev);
 116         pci_remove_bus_device(dev);
 117 }
 118 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 119
 120 void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
 121 {
 122         pci_lock_rescan_remove();
 123         pci_stop_and_remove_bus_device(dev);
 124         pci_unlock_rescan_remove();
 125 }
 126 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
 127
 128 void pci_stop_root_bus(struct pci_bus *bus)
 129 {
 130         struct pci_dev *child, *tmp;
 131         struct pci_host_bridge *host_bridge;
 132
 133         if (!pci_is_root_bus(bus))
 134                 return;
 135
 136         host_bridge = to_pci_host_bridge(bus->bridge);
 137         list_for_each_entry_safe_reverse(child, tmp,
 138                                          &bus->devices, bus_list)
 139                 pci_stop_bus_device(child);
 140
 141         /* stop the host bridge */
 142         device_release_driver(&host_bridge->dev);
 143 }
 144 EXPORT_SYMBOL_GPL(pci_stop_root_bus);
 145
 146 void pci_remove_root_bus(struct pci_bus *bus)
 147 {
 148         struct pci_dev *child, *tmp;
 149         struct pci_host_bridge *host_bridge;
 150
 151         if (!pci_is_root_bus(bus))
 152                 return;
 153
 154         host_bridge = to_pci_host_bridge(bus->bridge);
 155         list_for_each_entry_safe(child, tmp,
 156                                  &bus->devices, bus_list)
 157                 pci_remove_bus_device(child);
 158         pci_remove_bus(bus);
 159         host_bridge->bus = NULL;
 160
 161         /* remove the host bridge */
 162         device_unregister(&host_bridge->dev);
 163 }
 164 EXPORT_SYMBOL_GPL(pci_remove_root_bus);