1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/pci.h>
3 #include <linux/module.h>
4 #include "pci.h"
5
pci_free_resources(struct pci_dev * dev)6 static 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
pci_stop_dev(struct pci_dev * dev)16 static 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
pci_destroy_dev(struct pci_dev * dev)31 static 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
pci_remove_bus(struct pci_bus * bus)49 void 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 }
65 EXPORT_SYMBOL(pci_remove_bus);
66
pci_stop_bus_device(struct pci_dev * dev)67 static 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
pci_remove_bus_device(struct pci_dev * dev)87 static 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 */
pci_stop_and_remove_bus_device(struct pci_dev * dev)116 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
117 {
118 pci_stop_bus_device(dev);
119 pci_remove_bus_device(dev);
120 }
121 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
122
pci_stop_and_remove_bus_device_locked(struct pci_dev * dev)123 void 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 }
129 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
130
pci_stop_root_bus(struct pci_bus * bus)131 void 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 }
147 EXPORT_SYMBOL_GPL(pci_stop_root_bus);
148
pci_remove_root_bus(struct pci_bus * bus)149 void 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 }
174 EXPORT_SYMBOL_GPL(pci_remove_root_bus);
175