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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/pci.h>
3#include <linux/module.h>
4#include <linux/of.h>
5#include <linux/of_platform.h>
6#include <linux/platform_device.h>
7
8#include "pci.h"
9
10static void pci_free_resources(struct pci_dev *dev)
11{
12 struct resource *res;
13
14 pci_dev_for_each_resource(dev, res) {
15 if (res->parent)
16 release_resource(res);
17 }
18}
19
20static void pci_pwrctrl_unregister(struct device *dev)
21{
22 struct device_node *np;
23 struct platform_device *pdev;
24
25 np = dev_of_node(dev);
26 if (!np)
27 return;
28
29 pdev = of_find_device_by_node(np);
30 if (!pdev)
31 return;
32
33 of_device_unregister(pdev);
34 of_node_clear_flag(np, OF_POPULATED);
35}
36
37static void pci_stop_dev(struct pci_dev *dev)
38{
39 pci_pme_active(dev, false);
40
41 if (!pci_dev_test_and_clear_added(dev))
42 return;
43
44 pci_pwrctrl_unregister(&dev->dev);
45 device_release_driver(&dev->dev);
46 pci_proc_detach_device(dev);
47 pci_remove_sysfs_dev_files(dev);
48 of_pci_remove_node(dev);
49}
50
51static void pci_destroy_dev(struct pci_dev *dev)
52{
53 if (pci_dev_test_and_set_removed(dev))
54 return;
55
56 pci_npem_remove(dev);
57
58 device_del(&dev->dev);
59
60 down_write(&pci_bus_sem);
61 list_del(&dev->bus_list);
62 up_write(&pci_bus_sem);
63
64 pci_doe_destroy(dev);
65 pcie_aspm_exit_link_state(dev);
66 pci_bridge_d3_update(dev);
67 pci_free_resources(dev);
68 put_device(&dev->dev);
69}
70
71void pci_remove_bus(struct pci_bus *bus)
72{
73 pci_proc_detach_bus(bus);
74
75 down_write(&pci_bus_sem);
76 list_del(&bus->node);
77 pci_bus_release_busn_res(bus);
78 up_write(&pci_bus_sem);
79 pci_remove_legacy_files(bus);
80
81 if (bus->ops->remove_bus)
82 bus->ops->remove_bus(bus);
83
84 pcibios_remove_bus(bus);
85 device_unregister(&bus->dev);
86}
87EXPORT_SYMBOL(pci_remove_bus);
88
89static void pci_stop_bus_device(struct pci_dev *dev)
90{
91 struct pci_bus *bus = dev->subordinate;
92 struct pci_dev *child, *tmp;
93
94 /*
95 * Stopping an SR-IOV PF device removes all the associated VFs,
96 * which will update the bus->devices list and confuse the
97 * iterator. Therefore, iterate in reverse so we remove the VFs
98 * first, then the PF.
99 */
100 if (bus) {
101 list_for_each_entry_safe_reverse(child, tmp,
102 &bus->devices, bus_list)
103 pci_stop_bus_device(child);
104 }
105
106 pci_stop_dev(dev);
107}
108
109static void pci_remove_bus_device(struct pci_dev *dev)
110{
111 struct pci_bus *bus = dev->subordinate;
112 struct pci_dev *child, *tmp;
113
114 if (bus) {
115 list_for_each_entry_safe(child, tmp,
116 &bus->devices, bus_list)
117 pci_remove_bus_device(child);
118
119 pci_remove_bus(bus);
120 dev->subordinate = NULL;
121 }
122
123 pci_destroy_dev(dev);
124}
125
126/**
127 * pci_stop_and_remove_bus_device - remove a PCI device and any children
128 * @dev: the device to remove
129 *
130 * Remove a PCI device from the device lists, informing the drivers
131 * that the device has been removed. We also remove any subordinate
132 * buses and children in a depth-first manner.
133 *
134 * For each device we remove, delete the device structure from the
135 * device lists, remove the /proc entry, and notify userspace
136 * (/sbin/hotplug).
137 */
138void pci_stop_and_remove_bus_device(struct pci_dev *dev)
139{
140 pci_stop_bus_device(dev);
141 pci_remove_bus_device(dev);
142}
143EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
144
145void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
146{
147 pci_lock_rescan_remove();
148 pci_stop_and_remove_bus_device(dev);
149 pci_unlock_rescan_remove();
150}
151EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
152
153void pci_stop_root_bus(struct pci_bus *bus)
154{
155 struct pci_dev *child, *tmp;
156 struct pci_host_bridge *host_bridge;
157
158 if (!pci_is_root_bus(bus))
159 return;
160
161 host_bridge = to_pci_host_bridge(bus->bridge);
162 list_for_each_entry_safe_reverse(child, tmp,
163 &bus->devices, bus_list)
164 pci_stop_bus_device(child);
165
166 /* stop the host bridge */
167 device_release_driver(&host_bridge->dev);
168}
169EXPORT_SYMBOL_GPL(pci_stop_root_bus);
170
171void pci_remove_root_bus(struct pci_bus *bus)
172{
173 struct pci_dev *child, *tmp;
174 struct pci_host_bridge *host_bridge;
175
176 if (!pci_is_root_bus(bus))
177 return;
178
179 host_bridge = to_pci_host_bridge(bus->bridge);
180 list_for_each_entry_safe(child, tmp,
181 &bus->devices, bus_list)
182 pci_remove_bus_device(child);
183
184#ifdef CONFIG_PCI_DOMAINS_GENERIC
185 /* Release domain_nr if it was dynamically allocated */
186 if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
187 pci_bus_release_domain_nr(host_bridge->dev.parent, bus->domain_nr);
188#endif
189
190 pci_remove_bus(bus);
191 host_bridge->bus = NULL;
192
193 /* remove the host bridge */
194 device_del(&host_bridge->dev);
195}
196EXPORT_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_unregister(&host_bridge->dev);
164}
165EXPORT_SYMBOL_GPL(pci_remove_root_bus);