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 if (dev->bus->self)
30 pcie_aspm_exit_link_state(dev);
31 }
32
pci_destroy_dev(struct pci_dev * dev)33 static 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_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 pci_remove_bus(bus);
162 host_bridge->bus = NULL;
163
164 /* remove the host bridge */
165 device_unregister(&host_bridge->dev);
166 }
167 EXPORT_SYMBOL_GPL(pci_remove_root_bus);
168
