1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/pci.h>
3 #include <linux/module.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 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
11 struct resource *res = dev->resource + i;
12 if (res->parent)
13 release_resource(res);
14 }
15 }
16
pci_stop_dev(struct pci_dev * dev)17 static void pci_stop_dev(struct pci_dev *dev)
18 {
19 pci_pme_active(dev, false);
20
21 if (pci_dev_is_added(dev)) {
22
23 device_release_driver(&dev->dev);
24 pci_proc_detach_device(dev);
25 pci_remove_sysfs_dev_files(dev);
26
27 pci_dev_assign_added(dev, false);
28 }
29 }
30
pci_destroy_dev(struct pci_dev * dev)31 static void pci_destroy_dev(struct pci_dev *dev)
32 {
33 if (!dev->dev.kobj.parent)
34 return;
35
36 device_del(&dev->dev);
37
38 down_write(&pci_bus_sem);
39 list_del(&dev->bus_list);
40 up_write(&pci_bus_sem);
41
42 pcie_aspm_exit_link_state(dev);
43 pci_bridge_d3_update(dev);
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
58 if (bus->ops->remove_bus)
59 bus->ops->remove_bus(bus);
60
61 pcibios_remove_bus(bus);
62 device_unregister(&bus->dev);
63 }
64 EXPORT_SYMBOL(pci_remove_bus);
65
pci_stop_bus_device(struct pci_dev * dev)66 static void pci_stop_bus_device(struct pci_dev *dev)
67 {
68 struct pci_bus *bus = dev->subordinate;
69 struct pci_dev *child, *tmp;
70
71 /*
72 * Stopping an SR-IOV PF device removes all the associated VFs,
73 * which will update the bus->devices list and confuse the
74 * iterator. Therefore, iterate in reverse so we remove the VFs
75 * first, then the PF.
76 */
77 if (bus) {
78 list_for_each_entry_safe_reverse(child, tmp,
79 &bus->devices, bus_list)
80 pci_stop_bus_device(child);
81 }
82
83 pci_stop_dev(dev);
84 }
85
pci_remove_bus_device(struct pci_dev * dev)86 static void pci_remove_bus_device(struct pci_dev *dev)
87 {
88 struct pci_bus *bus = dev->subordinate;
89 struct pci_dev *child, *tmp;
90
91 if (bus) {
92 list_for_each_entry_safe(child, tmp,
93 &bus->devices, bus_list)
94 pci_remove_bus_device(child);
95
96 pci_remove_bus(bus);
97 dev->subordinate = NULL;
98 }
99
100 pci_destroy_dev(dev);
101 }
102
103 /**
104 * pci_stop_and_remove_bus_device - remove a PCI device and any children
105 * @dev: the device to remove
106 *
107 * Remove a PCI device from the device lists, informing the drivers
108 * that the device has been removed. We also remove any subordinate
109 * buses and children in a depth-first manner.
110 *
111 * For each device we remove, delete the device structure from the
112 * device lists, remove the /proc entry, and notify userspace
113 * (/sbin/hotplug).
114 */
pci_stop_and_remove_bus_device(struct pci_dev * dev)115 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
116 {
117 pci_stop_bus_device(dev);
118 pci_remove_bus_device(dev);
119 }
120 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
121
pci_stop_and_remove_bus_device_locked(struct pci_dev * dev)122 void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
123 {
124 pci_lock_rescan_remove();
125 pci_stop_and_remove_bus_device(dev);
126 pci_unlock_rescan_remove();
127 }
128 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
129
pci_stop_root_bus(struct pci_bus * bus)130 void pci_stop_root_bus(struct pci_bus *bus)
131 {
132 struct pci_dev *child, *tmp;
133 struct pci_host_bridge *host_bridge;
134
135 if (!pci_is_root_bus(bus))
136 return;
137
138 host_bridge = to_pci_host_bridge(bus->bridge);
139 list_for_each_entry_safe_reverse(child, tmp,
140 &bus->devices, bus_list)
141 pci_stop_bus_device(child);
142
143 /* stop the host bridge */
144 device_release_driver(&host_bridge->dev);
145 }
146 EXPORT_SYMBOL_GPL(pci_stop_root_bus);
147
pci_remove_root_bus(struct pci_bus * bus)148 void pci_remove_root_bus(struct pci_bus *bus)
149 {
150 struct pci_dev *child, *tmp;
151 struct pci_host_bridge *host_bridge;
152
153 if (!pci_is_root_bus(bus))
154 return;
155
156 host_bridge = to_pci_host_bridge(bus->bridge);
157 list_for_each_entry_safe(child, tmp,
158 &bus->devices, bus_list)
159 pci_remove_bus_device(child);
160 pci_remove_bus(bus);
161 host_bridge->bus = NULL;
162
163 /* remove the host bridge */
164 device_del(&host_bridge->dev);
165 }
166 EXPORT_SYMBOL_GPL(pci_remove_root_bus);
167