LXR linux/drivers/pci/remove.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/pci.h>
   3#include <linux/module.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 (pci_dev_is_added(dev)) {
  22                device_release_driver(&dev->dev);
  23                pci_proc_detach_device(dev);
  24                pci_remove_sysfs_dev_files(dev);
  25
  26                pci_dev_assign_added(dev, false);
  27        }
  28}
  29
  30static void pci_destroy_dev(struct pci_dev *dev)
  31{
  32        if (!dev->dev.kobj.parent)
  33                return;
  34
  35        device_del(&dev->dev);
  36
  37        down_write(&pci_bus_sem);
  38        list_del(&dev->bus_list);
  39        up_write(&pci_bus_sem);
  40
  41        pcie_aspm_exit_link_state(dev);
  42        pci_bridge_d3_update(dev);
  43        pci_free_resources(dev);
  44        put_device(&dev->dev);
  45}
  46
  47void 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}
  63EXPORT_SYMBOL(pci_remove_bus);
  64
  65static 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
  85static 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_destroy_dev(dev);
 100}
 101
 102/**
 103 * pci_stop_and_remove_bus_device - remove a PCI device and any children
 104 * @dev: the device to remove
 105 *
 106 * Remove a PCI device from the device lists, informing the drivers
 107 * that the device has been removed.  We also remove any subordinate
 108 * buses and children in a depth-first manner.
 109 *
 110 * For each device we remove, delete the device structure from the
 111 * device lists, remove the /proc entry, and notify userspace
 112 * (/sbin/hotplug).
 113 */
 114void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 115{
 116        pci_stop_bus_device(dev);
 117        pci_remove_bus_device(dev);
 118}
 119EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 120
 121void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
 122{
 123        pci_lock_rescan_remove();
 124        pci_stop_and_remove_bus_device(dev);
 125        pci_unlock_rescan_remove();
 126}
 127EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
 128
 129void pci_stop_root_bus(struct pci_bus *bus)
 130{
 131        struct pci_dev *child, *tmp;
 132        struct pci_host_bridge *host_bridge;
 133
 134        if (!pci_is_root_bus(bus))
 135                return;
 136
 137        host_bridge = to_pci_host_bridge(bus->bridge);
 138        list_for_each_entry_safe_reverse(child, tmp,
 139                                         &bus->devices, bus_list)
 140                pci_stop_bus_device(child);
 141
 142        /* stop the host bridge */
 143        device_release_driver(&host_bridge->dev);
 144}
 145EXPORT_SYMBOL_GPL(pci_stop_root_bus);
 146
 147void pci_remove_root_bus(struct pci_bus *bus)
 148{
 149        struct pci_dev *child, *tmp;
 150        struct pci_host_bridge *host_bridge;
 151
 152        if (!pci_is_root_bus(bus))
 153                return;
 154
 155        host_bridge = to_pci_host_bridge(bus->bridge);
 156        list_for_each_entry_safe(child, tmp,
 157                                 &bus->devices, bus_list)
 158                pci_remove_bus_device(child);
 159        pci_remove_bus(bus);
 160        host_bridge->bus = NULL;
 161
 162        /* remove the host bridge */
 163        device_del(&host_bridge->dev);
 164}
 165EXPORT_SYMBOL_GPL(pci_remove_root_bus);
 166