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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#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}