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         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
  17 static void pci_stop_dev(struct pci_dev *dev)
  18 {
  19         pci_pme_active(dev, false);
  20
  21         if (dev->is_added) {
  22                 pci_proc_detach_device(dev);
  23                 pci_remove_sysfs_dev_files(dev);
  24                 device_release_driver(&dev->dev);
  25                 dev->is_added = 0;
  26         }
  27
  28         if (dev->bus->self)
  29                 pcie_aspm_exit_link_state(dev);
  30 }
  31
  32 static 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         pci_free_resources(dev);
  44         put_device(&dev->dev);
  45 }
  46
  47 void 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 }
  63 EXPORT_SYMBOL(pci_remove_bus);
  64
  65 static 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
  85 static 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_bridge_d3_device_removed(dev);
 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  */
 116 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 117 {
 118         pci_stop_bus_device(dev);
 119         pci_remove_bus_device(dev);
 120 }
 121 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 122
 123 void 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 }
 129 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
 130
 131 void 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 }
 147 EXPORT_SYMBOL_GPL(pci_stop_root_bus);
 148
 149 void 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_unregister(&host_bridge->dev);
 166 }
 167 EXPORT_SYMBOL_GPL(pci_remove_root_bus);