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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 struct resource *res;
9
10 pci_dev_for_each_resource(dev, res) {
11 if (res->parent)
12 release_resource(res);
13 }
14}
15
16static void pci_stop_dev(struct pci_dev *dev)
17{
18 pci_pme_active(dev, false);
19
20 if (pci_dev_is_added(dev)) {
21
22 device_release_driver(&dev->dev);
23 pci_proc_detach_device(dev);
24 pci_remove_sysfs_dev_files(dev);
25 of_pci_remove_node(dev);
26
27 pci_dev_assign_added(dev, false);
28 }
29}
30
31static 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 pci_doe_destroy(dev);
43 pcie_aspm_exit_link_state(dev);
44 pci_bridge_d3_update(dev);
45 pci_free_resources(dev);
46 put_device(&dev->dev);
47}
48
49void pci_remove_bus(struct pci_bus *bus)
50{
51 pci_proc_detach_bus(bus);
52
53 down_write(&pci_bus_sem);
54 list_del(&bus->node);
55 pci_bus_release_busn_res(bus);
56 up_write(&pci_bus_sem);
57 pci_remove_legacy_files(bus);
58
59 if (bus->ops->remove_bus)
60 bus->ops->remove_bus(bus);
61
62 pcibios_remove_bus(bus);
63 device_unregister(&bus->dev);
64}
65EXPORT_SYMBOL(pci_remove_bus);
66
67static void pci_stop_bus_device(struct pci_dev *dev)
68{
69 struct pci_bus *bus = dev->subordinate;
70 struct pci_dev *child, *tmp;
71
72 /*
73 * Stopping an SR-IOV PF device removes all the associated VFs,
74 * which will update the bus->devices list and confuse the
75 * iterator. Therefore, iterate in reverse so we remove the VFs
76 * first, then the PF.
77 */
78 if (bus) {
79 list_for_each_entry_safe_reverse(child, tmp,
80 &bus->devices, bus_list)
81 pci_stop_bus_device(child);
82 }
83
84 pci_stop_dev(dev);
85}
86
87static void pci_remove_bus_device(struct pci_dev *dev)
88{
89 struct pci_bus *bus = dev->subordinate;
90 struct pci_dev *child, *tmp;
91
92 if (bus) {
93 list_for_each_entry_safe(child, tmp,
94 &bus->devices, bus_list)
95 pci_remove_bus_device(child);
96
97 pci_remove_bus(bus);
98 dev->subordinate = NULL;
99 }
100
101 pci_destroy_dev(dev);
102}
103
104/**
105 * pci_stop_and_remove_bus_device - remove a PCI device and any children
106 * @dev: the device to remove
107 *
108 * Remove a PCI device from the device lists, informing the drivers
109 * that the device has been removed. We also remove any subordinate
110 * buses and children in a depth-first manner.
111 *
112 * For each device we remove, delete the device structure from the
113 * device lists, remove the /proc entry, and notify userspace
114 * (/sbin/hotplug).
115 */
116void pci_stop_and_remove_bus_device(struct pci_dev *dev)
117{
118 pci_stop_bus_device(dev);
119 pci_remove_bus_device(dev);
120}
121EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
122
123void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
124{
125 pci_lock_rescan_remove();
126 pci_stop_and_remove_bus_device(dev);
127 pci_unlock_rescan_remove();
128}
129EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
130
131void pci_stop_root_bus(struct pci_bus *bus)
132{
133 struct pci_dev *child, *tmp;
134 struct pci_host_bridge *host_bridge;
135
136 if (!pci_is_root_bus(bus))
137 return;
138
139 host_bridge = to_pci_host_bridge(bus->bridge);
140 list_for_each_entry_safe_reverse(child, tmp,
141 &bus->devices, bus_list)
142 pci_stop_bus_device(child);
143
144 /* stop the host bridge */
145 device_release_driver(&host_bridge->dev);
146}
147EXPORT_SYMBOL_GPL(pci_stop_root_bus);
148
149void pci_remove_root_bus(struct pci_bus *bus)
150{
151 struct pci_dev *child, *tmp;
152 struct pci_host_bridge *host_bridge;
153
154 if (!pci_is_root_bus(bus))
155 return;
156
157 host_bridge = to_pci_host_bridge(bus->bridge);
158 list_for_each_entry_safe(child, tmp,
159 &bus->devices, bus_list)
160 pci_remove_bus_device(child);
161
162#ifdef CONFIG_PCI_DOMAINS_GENERIC
163 /* Release domain_nr if it was dynamically allocated */
164 if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
165 pci_bus_release_domain_nr(bus, host_bridge->dev.parent);
166#endif
167
168 pci_remove_bus(bus);
169 host_bridge->bus = NULL;
170
171 /* remove the host bridge */
172 device_del(&host_bridge->dev);
173}
174EXPORT_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}