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                 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         pcibios_remove_bus(bus);
  57         device_unregister(&bus->dev);
  58 }
  59 EXPORT_SYMBOL(pci_remove_bus);
  60
  61 static void pci_stop_bus_device(struct pci_dev *dev)
  62 {
  63         struct pci_bus *bus = dev->subordinate;
  64         struct pci_dev *child, *tmp;
  65
  66         /*
  67          * Stopping an SR-IOV PF device removes all the associated VFs,
  68          * which will update the bus->devices list and confuse the
  69          * iterator.  Therefore, iterate in reverse so we remove the VFs
  70          * first, then the PF.
  71          */
  72         if (bus) {
  73                 list_for_each_entry_safe_reverse(child, tmp,
  74                                                  &bus->devices, bus_list)
  75                         pci_stop_bus_device(child);
  76         }
  77
  78         pci_stop_dev(dev);
  79 }
  80
  81 static void pci_remove_bus_device(struct pci_dev *dev)
  82 {
  83         struct pci_bus *bus = dev->subordinate;
  84         struct pci_dev *child, *tmp;
  85
  86         if (bus) {
  87                 list_for_each_entry_safe(child, tmp,
  88                                          &bus->devices, bus_list)
  89                         pci_remove_bus_device(child);
  90
  91                 pci_remove_bus(bus);
  92                 dev->subordinate = NULL;
  93         }
  94
  95         pci_destroy_dev(dev);
  96 }
  97
  98 /**
  99  * pci_stop_and_remove_bus_device - remove a PCI device and any children
 100  * @dev: the device to remove
 101  *
 102  * Remove a PCI device from the device lists, informing the drivers
 103  * that the device has been removed.  We also remove any subordinate
 104  * buses and children in a depth-first manner.
 105  *
 106  * For each device we remove, delete the device structure from the
 107  * device lists, remove the /proc entry, and notify userspace
 108  * (/sbin/hotplug).
 109  */
 110 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 111 {
 112         pci_stop_bus_device(dev);
 113         pci_remove_bus_device(dev);
 114 }
 115 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 116
 117 void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
 118 {
 119         pci_lock_rescan_remove();
 120         pci_stop_and_remove_bus_device(dev);
 121         pci_unlock_rescan_remove();
 122 }
 123 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
 124
 125 void pci_stop_root_bus(struct pci_bus *bus)
 126 {
 127         struct pci_dev *child, *tmp;
 128         struct pci_host_bridge *host_bridge;
 129
 130         if (!pci_is_root_bus(bus))
 131                 return;
 132
 133         host_bridge = to_pci_host_bridge(bus->bridge);
 134         list_for_each_entry_safe_reverse(child, tmp,
 135                                          &bus->devices, bus_list)
 136                 pci_stop_bus_device(child);
 137
 138         /* stop the host bridge */
 139         device_release_driver(&host_bridge->dev);
 140 }
 141 EXPORT_SYMBOL_GPL(pci_stop_root_bus);
 142
 143 void pci_remove_root_bus(struct pci_bus *bus)
 144 {
 145         struct pci_dev *child, *tmp;
 146         struct pci_host_bridge *host_bridge;
 147
 148         if (!pci_is_root_bus(bus))
 149                 return;
 150
 151         host_bridge = to_pci_host_bridge(bus->bridge);
 152         list_for_each_entry_safe(child, tmp,
 153                                  &bus->devices, bus_list)
 154                 pci_remove_bus_device(child);
 155         pci_remove_bus(bus);
 156         host_bridge->bus = NULL;
 157
 158         /* remove the host bridge */
 159         device_unregister(&host_bridge->dev);
 160 }
 161 EXPORT_SYMBOL_GPL(pci_remove_root_bus);