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         /* 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
  56 int 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
  65 void 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 }
  78 EXPORT_SYMBOL(pci_remove_bus);
  79
  80 static 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  */
  93 static 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 }
 105 void pci_remove_bus_device(struct pci_dev *dev)
 106 {
 107         pci_stop_bus_device(dev);
 108         __pci_remove_bus_device(dev);
 109 }
 110
 111 static 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
 120 static 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  */
 137 void pci_remove_behind_bridge(struct pci_dev *dev)
 138 {
 139         pci_stop_behind_bridge(dev);
 140         __pci_remove_behind_bridge(dev);
 141 }
 142
 143 static void pci_stop_bus_devices(struct pci_bus *bus)
 144 {
 145         struct list_head *l, *n;
 146
 147         /*
 148          * VFs could be removed by pci_remove_bus_device() in the
 149          *  pci_stop_bus_devices() code path for PF.
 150          *  aka, bus->devices get updated in the process.
 151          * but VFs are inserted after PFs when SRIOV is enabled for PF,
 152          * We can iterate the list backwards to get prev valid PF instead
 153          *  of removed VF.
 154          */
 155         list_for_each_prev_safe(l, n, &bus->devices) {
 156                 struct pci_dev *dev = pci_dev_b(l);
 157                 pci_stop_bus_device(dev);
 158         }
 159 }
 160
 161 /**
 162  * pci_stop_bus_device - stop a PCI device and any children
 163  * @dev: the device to stop
 164  *
 165  * Stop a PCI device (detach the driver, remove from the global list
 166  * and so on). This also stop any subordinate buses and children in a
 167  * depth-first manner.
 168  */
 169 void pci_stop_bus_device(struct pci_dev *dev)
 170 {
 171         if (dev->subordinate)
 172                 pci_stop_bus_devices(dev->subordinate);
 173
 174         pci_stop_dev(dev);
 175 }
 176
 177 EXPORT_SYMBOL(pci_remove_bus_device);
 178 EXPORT_SYMBOL(pci_remove_behind_bridge);
 179 EXPORT_SYMBOL_GPL(pci_stop_bus_device);