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 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
pci_stop_dev(struct pci_dev * dev)18 static void pci_stop_dev(struct pci_dev *dev)
19 {
20 pci_pme_active(dev, false);
21
22 if (dev->is_added) {
23 device_release_driver(&dev->dev);
24 pci_proc_detach_device(dev);
25 pci_remove_sysfs_dev_files(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 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
pci_remove_bus(struct pci_bus * bus)48 void 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 }
60 EXPORT_SYMBOL(pci_remove_bus);
61
pci_stop_bus_device(struct pci_dev * dev)62 static 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
pci_remove_bus_device(struct pci_dev * dev)82 static 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 */
pci_stop_and_remove_bus_device(struct pci_dev * dev)111 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
112 {
113 pci_stop_bus_device(dev);
114 pci_remove_bus_device(dev);
115 }
116 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
117
pci_stop_and_remove_bus_device_locked(struct pci_dev * dev)118 void 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 }
124 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
125
pci_stop_root_bus(struct pci_bus * bus)126 void 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 EXPORT_SYMBOL_GPL(pci_stop_root_bus);
143
pci_remove_root_bus(struct pci_bus * bus)144 void pci_remove_root_bus(struct pci_bus *bus)
145 {
146 struct pci_dev *child, *tmp;
147 struct pci_host_bridge *host_bridge;
148
149 if (!pci_is_root_bus(bus))
150 return;
151
152 host_bridge = to_pci_host_bridge(bus->bridge);
153 list_for_each_entry_safe(child, tmp,
154 &bus->devices, bus_list)
155 pci_remove_bus_device(child);
156 pci_remove_bus(bus);
157 host_bridge->bus = NULL;
158
159 /* remove the host bridge */
160 device_unregister(&host_bridge->dev);
161 }
162 EXPORT_SYMBOL_GPL(pci_remove_root_bus);
163