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_del(&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         down_write(&pci_bus_sem);
  38         list_del(&dev->bus_list);
  39         up_write(&pci_bus_sem);
  40
  41         pci_free_resources(dev);
  42         put_device(&dev->dev);
  43 }
  44
  45 void pci_remove_bus(struct pci_bus *bus)
  46 {
  47         pci_proc_detach_bus(bus);
  48
  49         down_write(&pci_bus_sem);
  50         list_del(&bus->node);
  51         pci_bus_release_busn_res(bus);
  52         up_write(&pci_bus_sem);
  53         if (!bus->is_added)
  54                 return;
  55
  56         pci_remove_legacy_files(bus);
  57         device_unregister(&bus->dev);
  58 }
  59 EXPORT_SYMBOL(pci_remove_bus);
  60
  61 static void pci_stop_bus_device(struct pci_dev *dev)
  62 {
  63         struct pci_bus *bus = dev->subordinate;
  64         struct pci_dev *child, *tmp;
  65
  66         /*
  67          * Stopping an SR-IOV PF device removes all the associated VFs,
  68          * which will update the bus->devices list and confuse the
  69          * iterator.  Therefore, iterate in reverse so we remove the VFs
  70          * first, then the PF.
  71          */
  72         if (bus) {
  73                 list_for_each_entry_safe_reverse(child, tmp,
  74                                                  &bus->devices, bus_list)
  75                         pci_stop_bus_device(child);
  76         }
  77
  78         pci_stop_dev(dev);
  79 }
  80
  81 static void pci_remove_bus_device(struct pci_dev *dev)
  82 {
  83         struct pci_bus *bus = dev->subordinate;
  84         struct pci_dev *child, *tmp;
  85
  86         if (bus) {
  87                 list_for_each_entry_safe(child, tmp,
  88                                          &bus->devices, bus_list)
  89                         pci_remove_bus_device(child);
  90
  91                 pci_remove_bus(bus);
  92                 dev->subordinate = NULL;
  93         }
  94
  95         pci_destroy_dev(dev);
  96 }
  97
  98 /**
  99  * pci_stop_and_remove_bus_device - remove a PCI device and any children
 100  * @dev: the device to remove
 101  *
 102  * Remove a PCI device from the device lists, informing the drivers
 103  * that the device has been removed.  We also remove any subordinate
 104  * buses and children in a depth-first manner.
 105  *
 106  * For each device we remove, delete the device structure from the
 107  * device lists, remove the /proc entry, and notify userspace
 108  * (/sbin/hotplug).
 109  */
 110 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 111 {
 112         pci_stop_bus_device(dev);
 113         pci_remove_bus_device(dev);
 114 }
 115 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 116
 117 void pci_stop_root_bus(struct pci_bus *bus)
 118 {
 119         struct pci_dev *child, *tmp;
 120         struct pci_host_bridge *host_bridge;
 121
 122         if (!pci_is_root_bus(bus))
 123                 return;
 124
 125         host_bridge = to_pci_host_bridge(bus->bridge);
 126         list_for_each_entry_safe_reverse(child, tmp,
 127                                          &bus->devices, bus_list)
 128                 pci_stop_bus_device(child);
 129
 130         /* stop the host bridge */
 131         device_del(&host_bridge->dev);
 132 }
 133
 134 void pci_remove_root_bus(struct pci_bus *bus)
 135 {
 136         struct pci_dev *child, *tmp;
 137         struct pci_host_bridge *host_bridge;
 138
 139         if (!pci_is_root_bus(bus))
 140                 return;
 141
 142         host_bridge = to_pci_host_bridge(bus->bridge);
 143         list_for_each_entry_safe(child, tmp,
 144                                  &bus->devices, bus_list)
 145                 pci_remove_bus_device(child);
 146         pci_remove_bus(bus);
 147         host_bridge->bus = NULL;
 148
 149         /* remove the host bridge */
 150         put_device(&host_bridge->dev);
 151 }