drivers/pci/remove.c

   1 #include <linux/pci.h>
   2 #include <linux/module.h>
   3 #include <linux/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->global_list.next)
  23                 return;
  24
  25         if (!list_empty(&dev->global_list)) {
  26                 pci_proc_detach_device(dev);
  27                 pci_remove_sysfs_dev_files(dev);
  28                 device_unregister(&dev->dev);
  29                 down_write(&pci_bus_sem);
  30                 list_del(&dev->global_list);
  31                 dev->global_list.next = dev->global_list.prev = NULL;
  32                 up_write(&pci_bus_sem);
  33         }
  34
  35         if (dev->bus->self)
  36                 pcie_aspm_exit_link_state(dev);
  37 }
  38
  39 static void pci_destroy_dev(struct pci_dev *dev)
  40 {
  41         pci_stop_dev(dev);
  42
  43         /* Remove the device from the device lists, and prevent any further
  44          * list accesses from this device */
  45         down_write(&pci_bus_sem);
  46         list_del(&dev->bus_list);
  47         dev->bus_list.next = dev->bus_list.prev = NULL;
  48         up_write(&pci_bus_sem);
  49
  50         pci_free_resources(dev);
  51         pci_dev_put(dev);
  52 }
  53
  54 /**
  55  * pci_remove_device_safe - remove an unused hotplug device
  56  * @dev: the device to remove
  57  *
  58  * Delete the device structure from the device lists and
  59  * notify userspace (/sbin/hotplug), but only if the device
  60  * in question is not being used by a driver.
  61  * Returns 0 on success.
  62  */
  63 #if 0
  64 int pci_remove_device_safe(struct pci_dev *dev)
  65 {
  66         if (pci_dev_driver(dev))
  67                 return -EBUSY;
  68         pci_destroy_dev(dev);
  69         return 0;
  70 }
  71 #endif  /*  0  */
  72
  73 void pci_remove_bus(struct pci_bus *pci_bus)
  74 {
  75         pci_proc_detach_bus(pci_bus);
  76
  77         down_write(&pci_bus_sem);
  78         list_del(&pci_bus->node);
  79         up_write(&pci_bus_sem);
  80         pci_remove_legacy_files(pci_bus);
  81         device_remove_file(&pci_bus->dev, &dev_attr_cpuaffinity);
  82         device_unregister(&pci_bus->dev);
  83 }
  84 EXPORT_SYMBOL(pci_remove_bus);
  85
  86 /**
  87  * pci_remove_bus_device - remove a PCI device and any children
  88  * @dev: the device to remove
  89  *
  90  * Remove a PCI device from the device lists, informing the drivers
  91  * that the device has been removed.  We also remove any subordinate
  92  * buses and children in a depth-first manner.
  93  *
  94  * For each device we remove, delete the device structure from the
  95  * device lists, remove the /proc entry, and notify userspace
  96  * (/sbin/hotplug).
  97  */
  98 void pci_remove_bus_device(struct pci_dev *dev)
  99 {
 100         if (dev->subordinate) {
 101                 struct pci_bus *b = dev->subordinate;
 102
 103                 pci_remove_behind_bridge(dev);
 104                 pci_remove_bus(b);
 105                 dev->subordinate = NULL;
 106         }
 107
 108         pci_destroy_dev(dev);
 109 }
 110
 111 /**
 112  * pci_remove_behind_bridge - remove all devices behind a PCI bridge
 113  * @dev: PCI bridge device
 114  *
 115  * Remove all devices on the bus, except for the parent bridge.
 116  * This also removes any child buses, and any devices they may
 117  * contain in a depth-first manner.
 118  */
 119 void pci_remove_behind_bridge(struct pci_dev *dev)
 120 {
 121         struct list_head *l, *n;
 122
 123         if (dev->subordinate) {
 124                 list_for_each_safe(l, n, &dev->subordinate->devices) {
 125                         struct pci_dev *dev = pci_dev_b(l);
 126
 127                         pci_remove_bus_device(dev);
 128                 }
 129         }
 130 }
 131
 132 static void pci_stop_bus_devices(struct pci_bus *bus)
 133 {
 134         struct list_head *l, *n;
 135
 136         list_for_each_safe(l, n, &bus->devices) {
 137                 struct pci_dev *dev = pci_dev_b(l);
 138                 pci_stop_bus_device(dev);
 139         }
 140 }
 141
 142 /**
 143  * pci_stop_bus_device - stop a PCI device and any children
 144  * @dev: the device to stop
 145  *
 146  * Stop a PCI device (detach the driver, remove from the global list
 147  * and so on). This also stop any subordinate buses and children in a
 148  * depth-first manner.
 149  */
 150 void pci_stop_bus_device(struct pci_dev *dev)
 151 {
 152         if (dev->subordinate)
 153                 pci_stop_bus_devices(dev->subordinate);
 154
 155         pci_stop_dev(dev);
 156 }
 157
 158 EXPORT_SYMBOL(pci_remove_bus_device);
 159 EXPORT_SYMBOL(pci_remove_behind_bridge);
 160 EXPORT_SYMBOL_GPL(pci_stop_bus_device);