LXR linux/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
   6static 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
  17static 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
  32static 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_bridge_d3_update(dev);
  44        pci_free_resources(dev);
  45        put_device(&dev->dev);
  46}
  47
  48void 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
  58        if (bus->ops->remove_bus)
  59                bus->ops->remove_bus(bus);
  60
  61        pcibios_remove_bus(bus);
  62        device_unregister(&bus->dev);
  63}
  64EXPORT_SYMBOL(pci_remove_bus);
  65
  66static void pci_stop_bus_device(struct pci_dev *dev)
  67{
  68        struct pci_bus *bus = dev->subordinate;
  69        struct pci_dev *child, *tmp;
  70
  71        /*
  72         * Stopping an SR-IOV PF device removes all the associated VFs,
  73         * which will update the bus->devices list and confuse the
  74         * iterator.  Therefore, iterate in reverse so we remove the VFs
  75         * first, then the PF.
  76         */
  77        if (bus) {
  78                list_for_each_entry_safe_reverse(child, tmp,
  79                                                 &bus->devices, bus_list)
  80                        pci_stop_bus_device(child);
  81        }
  82
  83        pci_stop_dev(dev);
  84}
  85
  86static void pci_remove_bus_device(struct pci_dev *dev)
  87{
  88        struct pci_bus *bus = dev->subordinate;
  89        struct pci_dev *child, *tmp;
  90
  91        if (bus) {
  92                list_for_each_entry_safe(child, tmp,
  93                                         &bus->devices, bus_list)
  94                        pci_remove_bus_device(child);
  95
  96                pci_remove_bus(bus);
  97                dev->subordinate = NULL;
  98        }
  99
 100        pci_destroy_dev(dev);
 101}
 102
 103/**
 104 * pci_stop_and_remove_bus_device - remove a PCI device and any children
 105 * @dev: the device to remove
 106 *
 107 * Remove a PCI device from the device lists, informing the drivers
 108 * that the device has been removed.  We also remove any subordinate
 109 * buses and children in a depth-first manner.
 110 *
 111 * For each device we remove, delete the device structure from the
 112 * device lists, remove the /proc entry, and notify userspace
 113 * (/sbin/hotplug).
 114 */
 115void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 116{
 117        pci_stop_bus_device(dev);
 118        pci_remove_bus_device(dev);
 119}
 120EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 121
 122void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
 123{
 124        pci_lock_rescan_remove();
 125        pci_stop_and_remove_bus_device(dev);
 126        pci_unlock_rescan_remove();
 127}
 128EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
 129
 130void pci_stop_root_bus(struct pci_bus *bus)
 131{
 132        struct pci_dev *child, *tmp;
 133        struct pci_host_bridge *host_bridge;
 134
 135        if (!pci_is_root_bus(bus))
 136                return;
 137
 138        host_bridge = to_pci_host_bridge(bus->bridge);
 139        list_for_each_entry_safe_reverse(child, tmp,
 140                                         &bus->devices, bus_list)
 141                pci_stop_bus_device(child);
 142
 143        /* stop the host bridge */
 144        device_release_driver(&host_bridge->dev);
 145}
 146EXPORT_SYMBOL_GPL(pci_stop_root_bus);
 147
 148void pci_remove_root_bus(struct pci_bus *bus)
 149{
 150        struct pci_dev *child, *tmp;
 151        struct pci_host_bridge *host_bridge;
 152
 153        if (!pci_is_root_bus(bus))
 154                return;
 155
 156        host_bridge = to_pci_host_bridge(bus->bridge);
 157        list_for_each_entry_safe(child, tmp,
 158                                 &bus->devices, bus_list)
 159                pci_remove_bus_device(child);
 160        pci_remove_bus(bus);
 161        host_bridge->bus = NULL;
 162
 163        /* remove the host bridge */
 164        device_unregister(&host_bridge->dev);
 165}
 166EXPORT_SYMBOL_GPL(pci_remove_root_bus);
 167