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
pci_free_resources(struct pci_dev * dev)10 static 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
pci_pwrctl_unregister(struct device * dev,void * data)20 static int pci_pwrctl_unregister(struct device *dev, void *data)
21 {
22 struct device_node *pci_node = data, *plat_node = dev_of_node(dev);
23
24 if (dev_is_platform(dev) && plat_node && plat_node == pci_node) {
25 of_device_unregister(to_platform_device(dev));
26 of_node_clear_flag(plat_node, OF_POPULATED);
27 }
28
29 return 0;
30 }
31
pci_stop_dev(struct pci_dev * dev)32 static void pci_stop_dev(struct pci_dev *dev)
33 {
34 pci_pme_active(dev, false);
35
36 if (pci_dev_is_added(dev)) {
37 device_for_each_child(dev->dev.parent, dev_of_node(&dev->dev),
38 pci_pwrctl_unregister);
39 device_release_driver(&dev->dev);
40 pci_proc_detach_device(dev);
41 pci_remove_sysfs_dev_files(dev);
42 of_pci_remove_node(dev);
43
44 pci_dev_assign_added(dev, false);
45 }
46 }
47
pci_destroy_dev(struct pci_dev * dev)48 static void pci_destroy_dev(struct pci_dev *dev)
49 {
50 if (!dev->dev.kobj.parent)
51 return;
52
53 pci_npem_remove(dev);
54
55 device_del(&dev->dev);
56
57 down_write(&pci_bus_sem);
58 list_del(&dev->bus_list);
59 up_write(&pci_bus_sem);
60
61 pci_doe_destroy(dev);
62 pcie_aspm_exit_link_state(dev);
63 pci_bridge_d3_update(dev);
64 pci_free_resources(dev);
65 put_device(&dev->dev);
66 }
67
pci_remove_bus(struct pci_bus * bus)68 void pci_remove_bus(struct pci_bus *bus)
69 {
70 pci_proc_detach_bus(bus);
71
72 down_write(&pci_bus_sem);
73 list_del(&bus->node);
74 pci_bus_release_busn_res(bus);
75 up_write(&pci_bus_sem);
76 pci_remove_legacy_files(bus);
77
78 if (bus->ops->remove_bus)
79 bus->ops->remove_bus(bus);
80
81 pcibios_remove_bus(bus);
82 device_unregister(&bus->dev);
83 }
84 EXPORT_SYMBOL(pci_remove_bus);
85
pci_stop_bus_device(struct pci_dev * dev)86 static void pci_stop_bus_device(struct pci_dev *dev)
87 {
88 struct pci_bus *bus = dev->subordinate;
89 struct pci_dev *child, *tmp;
90
91 /*
92 * Stopping an SR-IOV PF device removes all the associated VFs,
93 * which will update the bus->devices list and confuse the
94 * iterator. Therefore, iterate in reverse so we remove the VFs
95 * first, then the PF.
96 */
97 if (bus) {
98 list_for_each_entry_safe_reverse(child, tmp,
99 &bus->devices, bus_list)
100 pci_stop_bus_device(child);
101 }
102
103 pci_stop_dev(dev);
104 }
105
pci_remove_bus_device(struct pci_dev * dev)106 static void pci_remove_bus_device(struct pci_dev *dev)
107 {
108 struct pci_bus *bus = dev->subordinate;
109 struct pci_dev *child, *tmp;
110
111 if (bus) {
112 list_for_each_entry_safe(child, tmp,
113 &bus->devices, bus_list)
114 pci_remove_bus_device(child);
115
116 pci_remove_bus(bus);
117 dev->subordinate = NULL;
118 }
119
120 pci_destroy_dev(dev);
121 }
122
123 /**
124 * pci_stop_and_remove_bus_device - remove a PCI device and any children
125 * @dev: the device to remove
126 *
127 * Remove a PCI device from the device lists, informing the drivers
128 * that the device has been removed. We also remove any subordinate
129 * buses and children in a depth-first manner.
130 *
131 * For each device we remove, delete the device structure from the
132 * device lists, remove the /proc entry, and notify userspace
133 * (/sbin/hotplug).
134 */
pci_stop_and_remove_bus_device(struct pci_dev * dev)135 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
136 {
137 pci_stop_bus_device(dev);
138 pci_remove_bus_device(dev);
139 }
140 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
141
pci_stop_and_remove_bus_device_locked(struct pci_dev * dev)142 void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
143 {
144 pci_lock_rescan_remove();
145 pci_stop_and_remove_bus_device(dev);
146 pci_unlock_rescan_remove();
147 }
148 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
149
pci_stop_root_bus(struct pci_bus * bus)150 void pci_stop_root_bus(struct pci_bus *bus)
151 {
152 struct pci_dev *child, *tmp;
153 struct pci_host_bridge *host_bridge;
154
155 if (!pci_is_root_bus(bus))
156 return;
157
158 host_bridge = to_pci_host_bridge(bus->bridge);
159 list_for_each_entry_safe_reverse(child, tmp,
160 &bus->devices, bus_list)
161 pci_stop_bus_device(child);
162
163 /* stop the host bridge */
164 device_release_driver(&host_bridge->dev);
165 }
166 EXPORT_SYMBOL_GPL(pci_stop_root_bus);
167
pci_remove_root_bus(struct pci_bus * bus)168 void pci_remove_root_bus(struct pci_bus *bus)
169 {
170 struct pci_dev *child, *tmp;
171 struct pci_host_bridge *host_bridge;
172
173 if (!pci_is_root_bus(bus))
174 return;
175
176 host_bridge = to_pci_host_bridge(bus->bridge);
177 list_for_each_entry_safe(child, tmp,
178 &bus->devices, bus_list)
179 pci_remove_bus_device(child);
180
181 #ifdef CONFIG_PCI_DOMAINS_GENERIC
182 /* Release domain_nr if it was dynamically allocated */
183 if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
184 pci_bus_release_domain_nr(host_bridge->dev.parent, bus->domain_nr);
185 #endif
186
187 pci_remove_bus(bus);
188 host_bridge->bus = NULL;
189
190 /* remove the host bridge */
191 device_del(&host_bridge->dev);
192 }
193 EXPORT_SYMBOL_GPL(pci_remove_root_bus);
194