linux/drivers/pci/remove.c
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   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                dev->reset_fn = 0;
  23
  24                device_release_driver(&dev->dev);
  25                pci_proc_detach_device(dev);
  26                pci_remove_sysfs_dev_files(dev);
  27
  28                pci_dev_assign_added(dev, false);
  29        }
  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        pcie_aspm_exit_link_state(dev);
  44        pci_bridge_d3_update(dev);
  45        pci_free_resources(dev);
  46        put_device(&dev->dev);
  47}
  48
  49void pci_remove_bus(struct pci_bus *bus)
  50{
  51        pci_proc_detach_bus(bus);
  52
  53        down_write(&pci_bus_sem);
  54        list_del(&bus->node);
  55        pci_bus_release_busn_res(bus);
  56        up_write(&pci_bus_sem);
  57        pci_remove_legacy_files(bus);
  58
  59        if (bus->ops->remove_bus)
  60                bus->ops->remove_bus(bus);
  61
  62        pcibios_remove_bus(bus);
  63        device_unregister(&bus->dev);
  64}
  65EXPORT_SYMBOL(pci_remove_bus);
  66
  67static void pci_stop_bus_device(struct pci_dev *dev)
  68{
  69        struct pci_bus *bus = dev->subordinate;
  70        struct pci_dev *child, *tmp;
  71
  72        /*
  73         * Stopping an SR-IOV PF device removes all the associated VFs,
  74         * which will update the bus->devices list and confuse the
  75         * iterator.  Therefore, iterate in reverse so we remove the VFs
  76         * first, then the PF.
  77         */
  78        if (bus) {
  79                list_for_each_entry_safe_reverse(child, tmp,
  80                                                 &bus->devices, bus_list)
  81                        pci_stop_bus_device(child);
  82        }
  83
  84        pci_stop_dev(dev);
  85}
  86
  87static void pci_remove_bus_device(struct pci_dev *dev)
  88{
  89        struct pci_bus *bus = dev->subordinate;
  90        struct pci_dev *child, *tmp;
  91
  92        if (bus) {
  93                list_for_each_entry_safe(child, tmp,
  94                                         &bus->devices, bus_list)
  95                        pci_remove_bus_device(child);
  96
  97                pci_remove_bus(bus);
  98                dev->subordinate = NULL;
  99        }
 100
 101        pci_destroy_dev(dev);
 102}
 103
 104/**
 105 * pci_stop_and_remove_bus_device - remove a PCI device and any children
 106 * @dev: the device to remove
 107 *
 108 * Remove a PCI device from the device lists, informing the drivers
 109 * that the device has been removed.  We also remove any subordinate
 110 * buses and children in a depth-first manner.
 111 *
 112 * For each device we remove, delete the device structure from the
 113 * device lists, remove the /proc entry, and notify userspace
 114 * (/sbin/hotplug).
 115 */
 116void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 117{
 118        pci_stop_bus_device(dev);
 119        pci_remove_bus_device(dev);
 120}
 121EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 122
 123void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
 124{
 125        pci_lock_rescan_remove();
 126        pci_stop_and_remove_bus_device(dev);
 127        pci_unlock_rescan_remove();
 128}
 129EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
 130
 131void pci_stop_root_bus(struct pci_bus *bus)
 132{
 133        struct pci_dev *child, *tmp;
 134        struct pci_host_bridge *host_bridge;
 135
 136        if (!pci_is_root_bus(bus))
 137                return;
 138
 139        host_bridge = to_pci_host_bridge(bus->bridge);
 140        list_for_each_entry_safe_reverse(child, tmp,
 141                                         &bus->devices, bus_list)
 142                pci_stop_bus_device(child);
 143
 144        /* stop the host bridge */
 145        device_release_driver(&host_bridge->dev);
 146}
 147EXPORT_SYMBOL_GPL(pci_stop_root_bus);
 148
 149void pci_remove_root_bus(struct pci_bus *bus)
 150{
 151        struct pci_dev *child, *tmp;
 152        struct pci_host_bridge *host_bridge;
 153
 154        if (!pci_is_root_bus(bus))
 155                return;
 156
 157        host_bridge = to_pci_host_bridge(bus->bridge);
 158        list_for_each_entry_safe(child, tmp,
 159                                 &bus->devices, bus_list)
 160                pci_remove_bus_device(child);
 161        pci_remove_bus(bus);
 162        host_bridge->bus = NULL;
 163
 164        /* remove the host bridge */
 165        device_del(&host_bridge->dev);
 166}
 167EXPORT_SYMBOL_GPL(pci_remove_root_bus);
 168