linux/drivers/pci/remove.c
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   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        msi_remove_pci_irq_vectors(dev);
  11
  12        pci_cleanup_rom(dev);
  13        for (i = 0; i < PCI_NUM_RESOURCES; i++) {
  14                struct resource *res = dev->resource + i;
  15                if (res->parent)
  16                        release_resource(res);
  17        }
  18}
  19
  20static void pci_stop_dev(struct pci_dev *dev)
  21{
  22        pci_pme_active(dev, false);
  23
  24        if (dev->is_added) {
  25                pci_proc_detach_device(dev);
  26                pci_remove_sysfs_dev_files(dev);
  27                device_del(&dev->dev);
  28                dev->is_added = 0;
  29        }
  30
  31        if (dev->bus->self)
  32                pcie_aspm_exit_link_state(dev);
  33}
  34
  35static void pci_destroy_dev(struct pci_dev *dev)
  36{
  37        down_write(&pci_bus_sem);
  38        list_del(&dev->bus_list);
  39        up_write(&pci_bus_sem);
  40
  41        pci_free_resources(dev);
  42        put_device(&dev->dev);
  43}
  44
  45void pci_remove_bus(struct pci_bus *bus)
  46{
  47        pci_proc_detach_bus(bus);
  48
  49        down_write(&pci_bus_sem);
  50        list_del(&bus->node);
  51        pci_bus_release_busn_res(bus);
  52        up_write(&pci_bus_sem);
  53        pci_remove_legacy_files(bus);
  54        pcibios_remove_bus(bus);
  55        device_unregister(&bus->dev);
  56}
  57EXPORT_SYMBOL(pci_remove_bus);
  58
  59static void pci_stop_bus_device(struct pci_dev *dev)
  60{
  61        struct pci_bus *bus = dev->subordinate;
  62        struct pci_dev *child, *tmp;
  63
  64        /*
  65         * Stopping an SR-IOV PF device removes all the associated VFs,
  66         * which will update the bus->devices list and confuse the
  67         * iterator.  Therefore, iterate in reverse so we remove the VFs
  68         * first, then the PF.
  69         */
  70        if (bus) {
  71                list_for_each_entry_safe_reverse(child, tmp,
  72                                                 &bus->devices, bus_list)
  73                        pci_stop_bus_device(child);
  74        }
  75
  76        pci_stop_dev(dev);
  77}
  78
  79static void pci_remove_bus_device(struct pci_dev *dev)
  80{
  81        struct pci_bus *bus = dev->subordinate;
  82        struct pci_dev *child, *tmp;
  83
  84        if (bus) {
  85                list_for_each_entry_safe(child, tmp,
  86                                         &bus->devices, bus_list)
  87                        pci_remove_bus_device(child);
  88
  89                pci_remove_bus(bus);
  90                dev->subordinate = NULL;
  91        }
  92
  93        pci_destroy_dev(dev);
  94}
  95
  96/**
  97 * pci_stop_and_remove_bus_device - remove a PCI device and any children
  98 * @dev: the device to remove
  99 *
 100 * Remove a PCI device from the device lists, informing the drivers
 101 * that the device has been removed.  We also remove any subordinate
 102 * buses and children in a depth-first manner.
 103 *
 104 * For each device we remove, delete the device structure from the
 105 * device lists, remove the /proc entry, and notify userspace
 106 * (/sbin/hotplug).
 107 */
 108void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 109{
 110        pci_stop_bus_device(dev);
 111        pci_remove_bus_device(dev);
 112}
 113EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 114
 115void pci_stop_root_bus(struct pci_bus *bus)
 116{
 117        struct pci_dev *child, *tmp;
 118        struct pci_host_bridge *host_bridge;
 119
 120        if (!pci_is_root_bus(bus))
 121                return;
 122
 123        host_bridge = to_pci_host_bridge(bus->bridge);
 124        list_for_each_entry_safe_reverse(child, tmp,
 125                                         &bus->devices, bus_list)
 126                pci_stop_bus_device(child);
 127
 128        /* stop the host bridge */
 129        device_del(&host_bridge->dev);
 130}
 131
 132void pci_remove_root_bus(struct pci_bus *bus)
 133{
 134        struct pci_dev *child, *tmp;
 135        struct pci_host_bridge *host_bridge;
 136
 137        if (!pci_is_root_bus(bus))
 138                return;
 139
 140        host_bridge = to_pci_host_bridge(bus->bridge);
 141        list_for_each_entry_safe(child, tmp,
 142                                 &bus->devices, bus_list)
 143                pci_remove_bus_device(child);
 144        pci_remove_bus(bus);
 145        host_bridge->bus = NULL;
 146
 147        /* remove the host bridge */
 148        put_device(&host_bridge->dev);
 149}
 150
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