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        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
  33static void pci_destroy_dev(struct pci_dev *dev)
  34{
  35        /* Remove the device from the device lists, and prevent any further
  36         * list accesses from this device */
  37        down_write(&pci_bus_sem);
  38        list_del(&dev->bus_list);
  39        dev->bus_list.next = dev->bus_list.prev = NULL;
  40        up_write(&pci_bus_sem);
  41
  42        pci_free_resources(dev);
  43        pci_dev_put(dev);
  44}
  45
  46/**
  47 * pci_remove_device_safe - remove an unused hotplug device
  48 * @dev: the device to remove
  49 *
  50 * Delete the device structure from the device lists and 
  51 * notify userspace (/sbin/hotplug), but only if the device
  52 * in question is not being used by a driver.
  53 * Returns 0 on success.
  54 */
  55#if 0
  56int pci_remove_device_safe(struct pci_dev *dev)
  57{
  58        if (pci_dev_driver(dev))
  59                return -EBUSY;
  60        pci_destroy_dev(dev);
  61        return 0;
  62}
  63#endif  /*  0  */
  64
  65void pci_remove_bus(struct pci_bus *pci_bus)
  66{
  67        pci_proc_detach_bus(pci_bus);
  68
  69        down_write(&pci_bus_sem);
  70        list_del(&pci_bus->node);
  71        up_write(&pci_bus_sem);
  72        if (!pci_bus->is_added)
  73                return;
  74
  75        pci_remove_legacy_files(pci_bus);
  76        device_unregister(&pci_bus->dev);
  77}
  78EXPORT_SYMBOL(pci_remove_bus);
  79
  80static void __pci_remove_behind_bridge(struct pci_dev *dev);
  81/**
  82 * pci_remove_bus_device - remove a PCI device and any children
  83 * @dev: the device to remove
  84 *
  85 * Remove a PCI device from the device lists, informing the drivers
  86 * that the device has been removed.  We also remove any subordinate
  87 * buses and children in a depth-first manner.
  88 *
  89 * For each device we remove, delete the device structure from the
  90 * device lists, remove the /proc entry, and notify userspace
  91 * (/sbin/hotplug).
  92 */
  93static void __pci_remove_bus_device(struct pci_dev *dev)
  94{
  95        if (dev->subordinate) {
  96                struct pci_bus *b = dev->subordinate;
  97
  98                __pci_remove_behind_bridge(dev);
  99                pci_remove_bus(b);
 100                dev->subordinate = NULL;
 101        }
 102
 103        pci_destroy_dev(dev);
 104}
 105void pci_remove_bus_device(struct pci_dev *dev)
 106{
 107        pci_stop_bus_device(dev);
 108        __pci_remove_bus_device(dev);
 109}
 110
 111static void __pci_remove_behind_bridge(struct pci_dev *dev)
 112{
 113        struct list_head *l, *n;
 114
 115        if (dev->subordinate)
 116                list_for_each_safe(l, n, &dev->subordinate->devices)
 117                        __pci_remove_bus_device(pci_dev_b(l));
 118}
 119
 120static void pci_stop_behind_bridge(struct pci_dev *dev)
 121{
 122        struct list_head *l, *n;
 123
 124        if (dev->subordinate)
 125                list_for_each_safe(l, n, &dev->subordinate->devices)
 126                        pci_stop_bus_device(pci_dev_b(l));
 127}
 128
 129/**
 130 * pci_remove_behind_bridge - remove all devices behind a PCI bridge
 131 * @dev: PCI bridge device
 132 *
 133 * Remove all devices on the bus, except for the parent bridge.
 134 * This also removes any child buses, and any devices they may
 135 * contain in a depth-first manner.
 136 */
 137void pci_remove_behind_bridge(struct pci_dev *dev)
 138{
 139        pci_stop_behind_bridge(dev);
 140        __pci_remove_behind_bridge(dev);
 141}
 142
 143static void pci_stop_bus_devices(struct pci_bus *bus)
 144{
 145        struct list_head *l, *n;
 146
 147        list_for_each_safe(l, n, &bus->devices) {
 148                struct pci_dev *dev = pci_dev_b(l);
 149                pci_stop_bus_device(dev);
 150        }
 151}
 152
 153/**
 154 * pci_stop_bus_device - stop a PCI device and any children
 155 * @dev: the device to stop
 156 *
 157 * Stop a PCI device (detach the driver, remove from the global list
 158 * and so on). This also stop any subordinate buses and children in a
 159 * depth-first manner.
 160 */
 161void pci_stop_bus_device(struct pci_dev *dev)
 162{
 163        if (dev->subordinate)
 164                pci_stop_bus_devices(dev->subordinate);
 165
 166        pci_stop_dev(dev);
 167}
 168
 169EXPORT_SYMBOL(pci_remove_bus_device);
 170EXPORT_SYMBOL(pci_remove_behind_bridge);
 171EXPORT_SYMBOL_GPL(pci_stop_bus_device);
 172