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
   6 static 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
  20 static void pci_stop_dev(struct pci_dev *dev)
  21 {
  22         if (dev->is_added) {
  23                 pci_proc_detach_device(dev);
  24                 pci_remove_sysfs_dev_files(dev);
  25                 device_unregister(&dev->dev);
  26                 dev->is_added = 0;
  27         }
  28
  29         if (dev->bus->self)
  30                 pcie_aspm_exit_link_state(dev);
  31 }
  32
  33 static void pci_destroy_dev(struct pci_dev *dev)
  34 {
  35         down_write(&pci_bus_sem);
  36         list_del(&dev->bus_list);
  37         up_write(&pci_bus_sem);
  38
  39         pci_free_resources(dev);
  40         pci_dev_put(dev);
  41 }
  42
  43 void pci_remove_bus(struct pci_bus *bus)
  44 {
  45         pci_proc_detach_bus(bus);
  46
  47         down_write(&pci_bus_sem);
  48         list_del(&bus->node);
  49         pci_bus_release_busn_res(bus);
  50         up_write(&pci_bus_sem);
  51         if (!bus->is_added)
  52                 return;
  53
  54         pci_remove_legacy_files(bus);
  55         device_unregister(&bus->dev);
  56 }
  57 EXPORT_SYMBOL(pci_remove_bus);
  58
  59 static 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
  79 static 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  */
 108 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 109 {
 110         pci_stop_bus_device(dev);
 111         pci_remove_bus_device(dev);
 112 }
 113 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 114
 115 void 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
 132 void 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 }