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 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
pci_stop_dev(struct pci_dev * dev)17 static 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
pci_destroy_dev(struct pci_dev * dev)30 static 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
pci_remove_bus(struct pci_bus * bus)47 void 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 }
63 EXPORT_SYMBOL(pci_remove_bus);
64
pci_stop_bus_device(struct pci_dev * dev)65 static 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
pci_remove_bus_device(struct pci_dev * dev)85 static 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 */
pci_stop_and_remove_bus_device(struct pci_dev * dev)114 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
115 {
116 pci_stop_bus_device(dev);
117 pci_remove_bus_device(dev);
118 }
119 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
120
pci_stop_and_remove_bus_device_locked(struct pci_dev * dev)121 void 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 }
127 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
128
pci_stop_root_bus(struct pci_bus * bus)129 void 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 }
145 EXPORT_SYMBOL_GPL(pci_stop_root_bus);
146
pci_remove_root_bus(struct pci_bus * bus)147 void 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 }
165 EXPORT_SYMBOL_GPL(pci_remove_root_bus);
166
