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        pci_bus_release_busn_res(pci_bus);
  72        up_write(&pci_bus_sem);
  73        if (!pci_bus->is_added)
  74                return;
  75
  76        pci_remove_legacy_files(pci_bus);
  77        device_unregister(&pci_bus->dev);
  78}
  79EXPORT_SYMBOL(pci_remove_bus);
  80
  81static void __pci_remove_behind_bridge(struct pci_dev *dev);
  82/**
  83 * pci_stop_and_remove_bus_device - remove a PCI device and any children
  84 * @dev: the device to remove
  85 *
  86 * Remove a PCI device from the device lists, informing the drivers
  87 * that the device has been removed.  We also remove any subordinate
  88 * buses and children in a depth-first manner.
  89 *
  90 * For each device we remove, delete the device structure from the
  91 * device lists, remove the /proc entry, and notify userspace
  92 * (/sbin/hotplug).
  93 */
  94void __pci_remove_bus_device(struct pci_dev *dev)
  95{
  96        if (dev->subordinate) {
  97                struct pci_bus *b = dev->subordinate;
  98
  99                __pci_remove_behind_bridge(dev);
 100                pci_remove_bus(b);
 101                dev->subordinate = NULL;
 102        }
 103
 104        pci_destroy_dev(dev);
 105}
 106EXPORT_SYMBOL(__pci_remove_bus_device);
 107
 108void 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
 114static void __pci_remove_behind_bridge(struct pci_dev *dev)
 115{
 116        struct list_head *l, *n;
 117
 118        if (dev->subordinate)
 119                list_for_each_safe(l, n, &dev->subordinate->devices)
 120                        __pci_remove_bus_device(pci_dev_b(l));
 121}
 122
 123static void pci_stop_behind_bridge(struct pci_dev *dev)
 124{
 125        struct list_head *l, *n;
 126
 127        if (dev->subordinate)
 128                list_for_each_safe(l, n, &dev->subordinate->devices)
 129                        pci_stop_bus_device(pci_dev_b(l));
 130}
 131
 132/**
 133 * pci_stop_and_remove_behind_bridge - stop and remove all devices behind
 134 *                                       a PCI bridge
 135 * @dev: PCI bridge device
 136 *
 137 * Remove all devices on the bus, except for the parent bridge.
 138 * This also removes any child buses, and any devices they may
 139 * contain in a depth-first manner.
 140 */
 141void pci_stop_and_remove_behind_bridge(struct pci_dev *dev)
 142{
 143        pci_stop_behind_bridge(dev);
 144        __pci_remove_behind_bridge(dev);
 145}
 146
 147static void pci_stop_bus_devices(struct pci_bus *bus)
 148{
 149        struct list_head *l, *n;
 150
 151        /*
 152         * VFs could be removed by pci_stop_and_remove_bus_device() in the
 153         *  pci_stop_bus_devices() code path for PF.
 154         *  aka, bus->devices get updated in the process.
 155         * but VFs are inserted after PFs when SRIOV is enabled for PF,
 156         * We can iterate the list backwards to get prev valid PF instead
 157         *  of removed VF.
 158         */
 159        list_for_each_prev_safe(l, n, &bus->devices) {
 160                struct pci_dev *dev = pci_dev_b(l);
 161                pci_stop_bus_device(dev);
 162        }
 163}
 164
 165/**
 166 * pci_stop_bus_device - stop a PCI device and any children
 167 * @dev: the device to stop
 168 *
 169 * Stop a PCI device (detach the driver, remove from the global list
 170 * and so on). This also stop any subordinate buses and children in a
 171 * depth-first manner.
 172 */
 173void pci_stop_bus_device(struct pci_dev *dev)
 174{
 175        if (dev->subordinate)
 176                pci_stop_bus_devices(dev->subordinate);
 177
 178        pci_stop_dev(dev);
 179}
 180
 181EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 182EXPORT_SYMBOL(pci_stop_and_remove_behind_bridge);
 183EXPORT_SYMBOL_GPL(pci_stop_bus_device);
 184
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