tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/pci.h>
2#include <linux/module.h>
3#include <linux/pci-aspm.h>
4#include "pci.h"
5
6static 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
20static 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
33static 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
56int 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
65void 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}
78EXPORT_SYMBOL(pci_remove_bus);
79
80/**
81 * pci_remove_bus_device - remove a PCI device and any children
82 * @dev: the device to remove
83 *
84 * Remove a PCI device from the device lists, informing the drivers
85 * that the device has been removed. We also remove any subordinate
86 * buses and children in a depth-first manner.
87 *
88 * For each device we remove, delete the device structure from the
89 * device lists, remove the /proc entry, and notify userspace
90 * (/sbin/hotplug).
91 */
92static void __pci_remove_bus_device(struct pci_dev *dev)
93{
94 if (dev->subordinate) {
95 struct pci_bus *b = dev->subordinate;
96
97 pci_remove_behind_bridge(dev);
98 pci_remove_bus(b);
99 dev->subordinate = NULL;
100 }
101
102 pci_destroy_dev(dev);
103}
104void pci_remove_bus_device(struct pci_dev *dev)
105{
106 pci_stop_bus_device(dev);
107 __pci_remove_bus_device(dev);
108}
109
110/**
111 * pci_remove_behind_bridge - remove all devices behind a PCI bridge
112 * @dev: PCI bridge device
113 *
114 * Remove all devices on the bus, except for the parent bridge.
115 * This also removes any child buses, and any devices they may
116 * contain in a depth-first manner.
117 */
118void pci_remove_behind_bridge(struct pci_dev *dev)
119{
120 struct list_head *l, *n;
121
122 if (dev->subordinate)
123 list_for_each_safe(l, n, &dev->subordinate->devices)
124 __pci_remove_bus_device(pci_dev_b(l));
125}
126
127static void pci_stop_bus_devices(struct pci_bus *bus)
128{
129 struct list_head *l, *n;
130
131 list_for_each_safe(l, n, &bus->devices) {
132 struct pci_dev *dev = pci_dev_b(l);
133 pci_stop_bus_device(dev);
134 }
135}
136
137/**
138 * pci_stop_bus_device - stop a PCI device and any children
139 * @dev: the device to stop
140 *
141 * Stop a PCI device (detach the driver, remove from the global list
142 * and so on). This also stop any subordinate buses and children in a
143 * depth-first manner.
144 */
145void pci_stop_bus_device(struct pci_dev *dev)
146{
147 if (dev->subordinate)
148 pci_stop_bus_devices(dev->subordinate);
149
150 pci_stop_dev(dev);
151}
152
153EXPORT_SYMBOL(pci_remove_bus_device);
154EXPORT_SYMBOL(pci_remove_behind_bridge);
155EXPORT_SYMBOL_GPL(pci_stop_bus_device);