Loading...
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/pci.h>
3#include <linux/module.h>
4#include "pci.h"
5
6static 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
17static void pci_stop_dev(struct pci_dev *dev)
18{
19 pci_pme_active(dev, false);
20
21 if (pci_dev_is_added(dev)) {
22 device_release_driver(&dev->dev);
23 pci_proc_detach_device(dev);
24 pci_remove_sysfs_dev_files(dev);
25
26 pci_dev_assign_added(dev, false);
27 }
28}
29
30static void pci_destroy_dev(struct pci_dev *dev)
31{
32 if (!dev->dev.kobj.parent)
33 return;
34
35 device_del(&dev->dev);
36
37 down_write(&pci_bus_sem);
38 list_del(&dev->bus_list);
39 up_write(&pci_bus_sem);
40
41 pcie_aspm_exit_link_state(dev);
42 pci_bridge_d3_update(dev);
43 pci_free_resources(dev);
44 put_device(&dev->dev);
45}
46
47void pci_remove_bus(struct pci_bus *bus)
48{
49 pci_proc_detach_bus(bus);
50
51 down_write(&pci_bus_sem);
52 list_del(&bus->node);
53 pci_bus_release_busn_res(bus);
54 up_write(&pci_bus_sem);
55 pci_remove_legacy_files(bus);
56
57 if (bus->ops->remove_bus)
58 bus->ops->remove_bus(bus);
59
60 pcibios_remove_bus(bus);
61 device_unregister(&bus->dev);
62}
63EXPORT_SYMBOL(pci_remove_bus);
64
65static void pci_stop_bus_device(struct pci_dev *dev)
66{
67 struct pci_bus *bus = dev->subordinate;
68 struct pci_dev *child, *tmp;
69
70 /*
71 * Stopping an SR-IOV PF device removes all the associated VFs,
72 * which will update the bus->devices list and confuse the
73 * iterator. Therefore, iterate in reverse so we remove the VFs
74 * first, then the PF.
75 */
76 if (bus) {
77 list_for_each_entry_safe_reverse(child, tmp,
78 &bus->devices, bus_list)
79 pci_stop_bus_device(child);
80 }
81
82 pci_stop_dev(dev);
83}
84
85static void pci_remove_bus_device(struct pci_dev *dev)
86{
87 struct pci_bus *bus = dev->subordinate;
88 struct pci_dev *child, *tmp;
89
90 if (bus) {
91 list_for_each_entry_safe(child, tmp,
92 &bus->devices, bus_list)
93 pci_remove_bus_device(child);
94
95 pci_remove_bus(bus);
96 dev->subordinate = NULL;
97 }
98
99 pci_destroy_dev(dev);
100}
101
102/**
103 * pci_stop_and_remove_bus_device - remove a PCI device and any children
104 * @dev: the device to remove
105 *
106 * Remove a PCI device from the device lists, informing the drivers
107 * that the device has been removed. We also remove any subordinate
108 * buses and children in a depth-first manner.
109 *
110 * For each device we remove, delete the device structure from the
111 * device lists, remove the /proc entry, and notify userspace
112 * (/sbin/hotplug).
113 */
114void pci_stop_and_remove_bus_device(struct pci_dev *dev)
115{
116 pci_stop_bus_device(dev);
117 pci_remove_bus_device(dev);
118}
119EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
120
121void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
122{
123 pci_lock_rescan_remove();
124 pci_stop_and_remove_bus_device(dev);
125 pci_unlock_rescan_remove();
126}
127EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
128
129void pci_stop_root_bus(struct pci_bus *bus)
130{
131 struct pci_dev *child, *tmp;
132 struct pci_host_bridge *host_bridge;
133
134 if (!pci_is_root_bus(bus))
135 return;
136
137 host_bridge = to_pci_host_bridge(bus->bridge);
138 list_for_each_entry_safe_reverse(child, tmp,
139 &bus->devices, bus_list)
140 pci_stop_bus_device(child);
141
142 /* stop the host bridge */
143 device_release_driver(&host_bridge->dev);
144}
145EXPORT_SYMBOL_GPL(pci_stop_root_bus);
146
147void pci_remove_root_bus(struct pci_bus *bus)
148{
149 struct pci_dev *child, *tmp;
150 struct pci_host_bridge *host_bridge;
151
152 if (!pci_is_root_bus(bus))
153 return;
154
155 host_bridge = to_pci_host_bridge(bus->bridge);
156 list_for_each_entry_safe(child, tmp,
157 &bus->devices, bus_list)
158 pci_remove_bus_device(child);
159 pci_remove_bus(bus);
160 host_bridge->bus = NULL;
161
162 /* remove the host bridge */
163 device_del(&host_bridge->dev);
164}
165EXPORT_SYMBOL_GPL(pci_remove_root_bus);
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}