1 #include <linux/pci.h>
2 #include <linux/module.h>
3 #include <linux/pci-aspm.h>
4 #include "pci.h"
5
pci_free_resources(struct pci_dev * dev)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
pci_stop_dev(struct pci_dev * dev)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
pci_destroy_dev(struct pci_dev * dev)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
pci_remove_bus(struct pci_bus * pci_bus)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_remove_file(&pci_bus->dev, &dev_attr_cpuaffinity);
77 device_remove_file(&pci_bus->dev, &dev_attr_cpulistaffinity);
78 device_unregister(&pci_bus->dev);
79 }
80 EXPORT_SYMBOL(pci_remove_bus);
81
82 /**
83 * pci_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 */
pci_remove_bus_device(struct pci_dev * dev)94 void pci_remove_bus_device(struct pci_dev *dev)
95 {
96 pci_stop_bus_device(dev);
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
108 /**
109 * pci_remove_behind_bridge - remove all devices behind a PCI bridge
110 * @dev: PCI bridge device
111 *
112 * Remove all devices on the bus, except for the parent bridge.
113 * This also removes any child buses, and any devices they may
114 * contain in a depth-first manner.
115 */
pci_remove_behind_bridge(struct pci_dev * dev)116 void pci_remove_behind_bridge(struct pci_dev *dev)
117 {
118 struct list_head *l, *n;
119
120 if (dev->subordinate)
121 list_for_each_safe(l, n, &dev->subordinate->devices)
122 pci_remove_bus_device(pci_dev_b(l));
123 }
124
pci_stop_bus_devices(struct pci_bus * bus)125 static void pci_stop_bus_devices(struct pci_bus *bus)
126 {
127 struct list_head *l, *n;
128
129 list_for_each_safe(l, n, &bus->devices) {
130 struct pci_dev *dev = pci_dev_b(l);
131 pci_stop_bus_device(dev);
132 }
133 }
134
135 /**
136 * pci_stop_bus_device - stop a PCI device and any children
137 * @dev: the device to stop
138 *
139 * Stop a PCI device (detach the driver, remove from the global list
140 * and so on). This also stop any subordinate buses and children in a
141 * depth-first manner.
142 */
pci_stop_bus_device(struct pci_dev * dev)143 void pci_stop_bus_device(struct pci_dev *dev)
144 {
145 if (dev->subordinate)
146 pci_stop_bus_devices(dev->subordinate);
147
148 pci_stop_dev(dev);
149 }
150
151 EXPORT_SYMBOL(pci_remove_bus_device);
152 EXPORT_SYMBOL(pci_remove_behind_bridge);
153 EXPORT_SYMBOL_GPL(pci_stop_bus_device);
154