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         pci_pme_active(dev, false);
  23
  24         if (dev->is_added) {
  25                 pci_proc_detach_device(dev);
  26                 pci_remove_sysfs_dev_files(dev);
  27                 device_unregister(&dev->dev);
  28                 dev->is_added = 0;
  29         }
  30
  31         if (dev->bus->self)
  32                 pcie_aspm_exit_link_state(dev);
  33 }
  34
  35 static void pci_destroy_dev(struct pci_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         if (!pci_bus->is_added)
  75                 return;
  76
  77         pci_remove_legacy_files(pci_bus);
  78         device_unregister(&pci_bus->dev);
  79 }
  80 EXPORT_SYMBOL(pci_remove_bus);
  81
  82 static void __pci_remove_behind_bridge(struct pci_dev *dev);
  83 /**
  84  * pci_stop_and_remove_bus_device - remove a PCI device and any children
  85  * @dev: the device to remove
  86  *
  87  * Remove a PCI device from the device lists, informing the drivers
  88  * that the device has been removed.  We also remove any subordinate
  89  * buses and children in a depth-first manner.
  90  *
  91  * For each device we remove, delete the device structure from the
  92  * device lists, remove the /proc entry, and notify userspace
  93  * (/sbin/hotplug).
  94  */
  95 void __pci_remove_bus_device(struct pci_dev *dev)
  96 {
  97         if (dev->subordinate) {
  98                 struct pci_bus *b = dev->subordinate;
  99
 100                 __pci_remove_behind_bridge(dev);
 101                 pci_remove_bus(b);
 102                 dev->subordinate = NULL;
 103         }
 104
 105         pci_destroy_dev(dev);
 106 }
 107 EXPORT_SYMBOL(__pci_remove_bus_device);
 108
 109 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 110 {
 111         pci_stop_bus_device(dev);
 112         __pci_remove_bus_device(dev);
 113 }
 114
 115 static void __pci_remove_behind_bridge(struct pci_dev *dev)
 116 {
 117         struct list_head *l, *n;
 118
 119         if (dev->subordinate)
 120                 list_for_each_safe(l, n, &dev->subordinate->devices)
 121                         __pci_remove_bus_device(pci_dev_b(l));
 122 }
 123
 124 static void pci_stop_behind_bridge(struct pci_dev *dev)
 125 {
 126         struct list_head *l, *n;
 127
 128         if (dev->subordinate)
 129                 list_for_each_safe(l, n, &dev->subordinate->devices)
 130                         pci_stop_bus_device(pci_dev_b(l));
 131 }
 132
 133 /**
 134  * pci_stop_and_remove_behind_bridge - stop and remove all devices behind
 135  *                                       a PCI bridge
 136  * @dev: PCI bridge device
 137  *
 138  * Remove all devices on the bus, except for the parent bridge.
 139  * This also removes any child buses, and any devices they may
 140  * contain in a depth-first manner.
 141  */
 142 void pci_stop_and_remove_behind_bridge(struct pci_dev *dev)
 143 {
 144         pci_stop_behind_bridge(dev);
 145         __pci_remove_behind_bridge(dev);
 146 }
 147
 148 static void pci_stop_bus_devices(struct pci_bus *bus)
 149 {
 150         struct list_head *l, *n;
 151
 152         /*
 153          * VFs could be removed by pci_stop_and_remove_bus_device() in the
 154          *  pci_stop_bus_devices() code path for PF.
 155          *  aka, bus->devices get updated in the process.
 156          * but VFs are inserted after PFs when SRIOV is enabled for PF,
 157          * We can iterate the list backwards to get prev valid PF instead
 158          *  of removed VF.
 159          */
 160         list_for_each_prev_safe(l, n, &bus->devices) {
 161                 struct pci_dev *dev = pci_dev_b(l);
 162                 pci_stop_bus_device(dev);
 163         }
 164 }
 165
 166 /**
 167  * pci_stop_bus_device - stop a PCI device and any children
 168  * @dev: the device to stop
 169  *
 170  * Stop a PCI device (detach the driver, remove from the global list
 171  * and so on). This also stop any subordinate buses and children in a
 172  * depth-first manner.
 173  */
 174 void pci_stop_bus_device(struct pci_dev *dev)
 175 {
 176         if (dev->subordinate)
 177                 pci_stop_bus_devices(dev->subordinate);
 178
 179         pci_stop_dev(dev);
 180 }
 181
 182 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 183 EXPORT_SYMBOL(pci_stop_and_remove_behind_bridge);
 184 EXPORT_SYMBOL_GPL(pci_stop_bus_device);