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