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_unregister(&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        pci_dev_put(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        if (!bus->is_added)
  54                return;
  55
  56        pci_remove_legacy_files(bus);
  57        device_unregister(&bus->dev);
  58}
  59EXPORT_SYMBOL(pci_remove_bus);
  60
  61static void pci_stop_bus_device(struct pci_dev *dev)
  62{
  63        struct pci_bus *bus = dev->subordinate;
  64        struct pci_dev *child, *tmp;
  65
  66        /*
  67         * Stopping an SR-IOV PF device removes all the associated VFs,
  68         * which will update the bus->devices list and confuse the
  69         * iterator.  Therefore, iterate in reverse so we remove the VFs
  70         * first, then the PF.
  71         */
  72        if (bus) {
  73                list_for_each_entry_safe_reverse(child, tmp,
  74                                                 &bus->devices, bus_list)
  75                        pci_stop_bus_device(child);
  76        }
  77
  78        pci_stop_dev(dev);
  79}
  80
  81static void pci_remove_bus_device(struct pci_dev *dev)
  82{
  83        struct pci_bus *bus = dev->subordinate;
  84        struct pci_dev *child, *tmp;
  85
  86        if (bus) {
  87                list_for_each_entry_safe(child, tmp,
  88                                         &bus->devices, bus_list)
  89                        pci_remove_bus_device(child);
  90
  91                pci_remove_bus(bus);
  92                dev->subordinate = NULL;
  93        }
  94
  95        pci_destroy_dev(dev);
  96}
  97
  98/**
  99 * pci_stop_and_remove_bus_device - remove a PCI device and any children
 100 * @dev: the device to remove
 101 *
 102 * Remove a PCI device from the device lists, informing the drivers
 103 * that the device has been removed.  We also remove any subordinate
 104 * buses and children in a depth-first manner.
 105 *
 106 * For each device we remove, delete the device structure from the
 107 * device lists, remove the /proc entry, and notify userspace
 108 * (/sbin/hotplug).
 109 */
 110void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 111{
 112        pci_stop_bus_device(dev);
 113        pci_remove_bus_device(dev);
 114}
 115EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 116
 117void pci_stop_root_bus(struct pci_bus *bus)
 118{
 119        struct pci_dev *child, *tmp;
 120        struct pci_host_bridge *host_bridge;
 121
 122        if (!pci_is_root_bus(bus))
 123                return;
 124
 125        host_bridge = to_pci_host_bridge(bus->bridge);
 126        list_for_each_entry_safe_reverse(child, tmp,
 127                                         &bus->devices, bus_list)
 128                pci_stop_bus_device(child);
 129
 130        /* stop the host bridge */
 131        device_del(&host_bridge->dev);
 132}
 133
 134void pci_remove_root_bus(struct pci_bus *bus)
 135{
 136        struct pci_dev *child, *tmp;
 137        struct pci_host_bridge *host_bridge;
 138
 139        if (!pci_is_root_bus(bus))
 140                return;
 141
 142        host_bridge = to_pci_host_bridge(bus->bridge);
 143        list_for_each_entry_safe(child, tmp,
 144                                 &bus->devices, bus_list)
 145                pci_remove_bus_device(child);
 146        pci_remove_bus(bus);
 147        host_bridge->bus = NULL;
 148
 149        /* remove the host bridge */
 150        put_device(&host_bridge->dev);
 151}
 152
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