[go: nahoru, domu]
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	pci_cleanup_rom(dev);
11	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
12		struct resource *res = dev->resource + i;
13		if (res->parent)
14			release_resource(res);
15	}
16}
17
18static void pci_stop_dev(struct pci_dev *dev)
19{
20	pci_pme_active(dev, false);
21
22	if (dev->is_added) {
23		pci_proc_detach_device(dev);
24		pci_remove_sysfs_dev_files(dev);
25		device_release_driver(&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	if (!dev->dev.kobj.parent)
36		return;
37
38	device_del(&dev->dev);
39
40	down_write(&pci_bus_sem);
41	list_del(&dev->bus_list);
42	up_write(&pci_bus_sem);
43
44	pci_free_resources(dev);
45	put_device(&dev->dev);
46}
47
48void pci_remove_bus(struct pci_bus *bus)
49{
50	pci_proc_detach_bus(bus);
51
52	down_write(&pci_bus_sem);
53	list_del(&bus->node);
54	pci_bus_release_busn_res(bus);
55	up_write(&pci_bus_sem);
56	pci_remove_legacy_files(bus);
57	pcibios_remove_bus(bus);
58	device_unregister(&bus->dev);
59}
60EXPORT_SYMBOL(pci_remove_bus);
61
62static void pci_stop_bus_device(struct pci_dev *dev)
63{
64	struct pci_bus *bus = dev->subordinate;
65	struct pci_dev *child, *tmp;
66
67	/*
68	 * Stopping an SR-IOV PF device removes all the associated VFs,
69	 * which will update the bus->devices list and confuse the
70	 * iterator.  Therefore, iterate in reverse so we remove the VFs
71	 * first, then the PF.
72	 */
73	if (bus) {
74		list_for_each_entry_safe_reverse(child, tmp,
75						 &bus->devices, bus_list)
76			pci_stop_bus_device(child);
77	}
78
79	pci_stop_dev(dev);
80}
81
82static void pci_remove_bus_device(struct pci_dev *dev)
83{
84	struct pci_bus *bus = dev->subordinate;
85	struct pci_dev *child, *tmp;
86
87	if (bus) {
88		list_for_each_entry_safe(child, tmp,
89					 &bus->devices, bus_list)
90			pci_remove_bus_device(child);
91
92		pci_remove_bus(bus);
93		dev->subordinate = NULL;
94	}
95
96	pci_destroy_dev(dev);
97}
98
99/**
100 * pci_stop_and_remove_bus_device - remove a PCI device and any children
101 * @dev: the device to remove
102 *
103 * Remove a PCI device from the device lists, informing the drivers
104 * that the device has been removed.  We also remove any subordinate
105 * buses and children in a depth-first manner.
106 *
107 * For each device we remove, delete the device structure from the
108 * device lists, remove the /proc entry, and notify userspace
109 * (/sbin/hotplug).
110 */
111void pci_stop_and_remove_bus_device(struct pci_dev *dev)
112{
113	pci_stop_bus_device(dev);
114	pci_remove_bus_device(dev);
115}
116EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
117
118void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
119{
120	pci_lock_rescan_remove();
121	pci_stop_and_remove_bus_device(dev);
122	pci_unlock_rescan_remove();
123}
124EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
125
126void pci_stop_root_bus(struct pci_bus *bus)
127{
128	struct pci_dev *child, *tmp;
129	struct pci_host_bridge *host_bridge;
130
131	if (!pci_is_root_bus(bus))
132		return;
133
134	host_bridge = to_pci_host_bridge(bus->bridge);
135	list_for_each_entry_safe_reverse(child, tmp,
136					 &bus->devices, bus_list)
137		pci_stop_bus_device(child);
138
139	/* stop the host bridge */
140	device_release_driver(&host_bridge->dev);
141}
142
143void pci_remove_root_bus(struct pci_bus *bus)
144{
145	struct pci_dev *child, *tmp;
146	struct pci_host_bridge *host_bridge;
147
148	if (!pci_is_root_bus(bus))
149		return;
150
151	host_bridge = to_pci_host_bridge(bus->bridge);
152	list_for_each_entry_safe(child, tmp,
153				 &bus->devices, bus_list)
154		pci_remove_bus_device(child);
155	pci_remove_bus(bus);
156	host_bridge->bus = NULL;
157
158	/* remove the host bridge */
159	device_unregister(&host_bridge->dev);
160}
161