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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// 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);