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         pci_stop_dev(dev);
  36
  37         /* Remove the device from the device lists, and prevent any further
  38          * list accesses from this device */
  39         down_write(&pci_bus_sem);
  40         list_del(&dev->bus_list);
  41         dev->bus_list.next = dev->bus_list.prev = NULL;
  42         up_write(&pci_bus_sem);
  43
  44         pci_free_resources(dev);
  45         pci_dev_put(dev);
  46 }
  47
  48 /**
  49  * pci_remove_device_safe - remove an unused hotplug device
  50  * @dev: the device to remove
  51  *
  52  * Delete the device structure from the device lists and
  53  * notify userspace (/sbin/hotplug), but only if the device
  54  * in question is not being used by a driver.
  55  * Returns 0 on success.
  56  */
  57 #if 0
  58 int pci_remove_device_safe(struct pci_dev *dev)
  59 {
  60         if (pci_dev_driver(dev))
  61                 return -EBUSY;
  62         pci_destroy_dev(dev);
  63         return 0;
  64 }
  65 #endif  /*  0  */
  66
  67 void pci_remove_bus(struct pci_bus *pci_bus)
  68 {
  69         pci_proc_detach_bus(pci_bus);
  70
  71         down_write(&pci_bus_sem);
  72         list_del(&pci_bus->node);
  73         up_write(&pci_bus_sem);
  74         pci_remove_legacy_files(pci_bus);
  75         device_remove_file(&pci_bus->dev, &dev_attr_cpuaffinity);
  76         device_unregister(&pci_bus->dev);
  77 }
  78 EXPORT_SYMBOL(pci_remove_bus);
  79
  80 /**
  81  * pci_remove_bus_device - remove a PCI device and any children
  82  * @dev: the device to remove
  83  *
  84  * Remove a PCI device from the device lists, informing the drivers
  85  * that the device has been removed.  We also remove any subordinate
  86  * buses and children in a depth-first manner.
  87  *
  88  * For each device we remove, delete the device structure from the
  89  * device lists, remove the /proc entry, and notify userspace
  90  * (/sbin/hotplug).
  91  */
  92 void pci_remove_bus_device(struct pci_dev *dev)
  93 {
  94         if (dev->subordinate) {
  95                 struct pci_bus *b = dev->subordinate;
  96
  97                 pci_remove_behind_bridge(dev);
  98                 pci_remove_bus(b);
  99                 dev->subordinate = NULL;
 100         }
 101
 102         pci_destroy_dev(dev);
 103 }
 104
 105 /**
 106  * pci_remove_behind_bridge - remove all devices behind a PCI bridge
 107  * @dev: PCI bridge device
 108  *
 109  * Remove all devices on the bus, except for the parent bridge.
 110  * This also removes any child buses, and any devices they may
 111  * contain in a depth-first manner.
 112  */
 113 void pci_remove_behind_bridge(struct pci_dev *dev)
 114 {
 115         struct list_head *l, *n;
 116
 117         if (dev->subordinate) {
 118                 list_for_each_safe(l, n, &dev->subordinate->devices) {
 119                         struct pci_dev *dev = pci_dev_b(l);
 120
 121                         pci_remove_bus_device(dev);
 122                 }
 123         }
 124 }
 125
 126 static void pci_stop_bus_devices(struct pci_bus *bus)
 127 {
 128         struct list_head *l, *n;
 129
 130         list_for_each_safe(l, n, &bus->devices) {
 131                 struct pci_dev *dev = pci_dev_b(l);
 132                 pci_stop_bus_device(dev);
 133         }
 134 }
 135
 136 /**
 137  * pci_stop_bus_device - stop a PCI device and any children
 138  * @dev: the device to stop
 139  *
 140  * Stop a PCI device (detach the driver, remove from the global list
 141  * and so on). This also stop any subordinate buses and children in a
 142  * depth-first manner.
 143  */
 144 void pci_stop_bus_device(struct pci_dev *dev)
 145 {
 146         if (dev->subordinate)
 147                 pci_stop_bus_devices(dev->subordinate);
 148
 149         pci_stop_dev(dev);
 150 }
 151
 152 EXPORT_SYMBOL(pci_remove_bus_device);
 153 EXPORT_SYMBOL(pci_remove_behind_bridge);
 154 EXPORT_SYMBOL_GPL(pci_stop_bus_device);