tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/pci.h>
3#include <linux/module.h>
4#include "pci.h"
5
6static 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
16static 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
26 pci_dev_assign_added(dev, false);
27 }
28}
29
30static 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 pci_doe_destroy(dev);
42 pcie_aspm_exit_link_state(dev);
43 pci_bridge_d3_update(dev);
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
58 if (bus->ops->remove_bus)
59 bus->ops->remove_bus(bus);
60
61 pcibios_remove_bus(bus);
62 device_unregister(&bus->dev);
63}
64EXPORT_SYMBOL(pci_remove_bus);
65
66static void pci_stop_bus_device(struct pci_dev *dev)
67{
68 struct pci_bus *bus = dev->subordinate;
69 struct pci_dev *child, *tmp;
70
71 /*
72 * Stopping an SR-IOV PF device removes all the associated VFs,
73 * which will update the bus->devices list and confuse the
74 * iterator. Therefore, iterate in reverse so we remove the VFs
75 * first, then the PF.
76 */
77 if (bus) {
78 list_for_each_entry_safe_reverse(child, tmp,
79 &bus->devices, bus_list)
80 pci_stop_bus_device(child);
81 }
82
83 pci_stop_dev(dev);
84}
85
86static void pci_remove_bus_device(struct pci_dev *dev)
87{
88 struct pci_bus *bus = dev->subordinate;
89 struct pci_dev *child, *tmp;
90
91 if (bus) {
92 list_for_each_entry_safe(child, tmp,
93 &bus->devices, bus_list)
94 pci_remove_bus_device(child);
95
96 pci_remove_bus(bus);
97 dev->subordinate = NULL;
98 }
99
100 pci_destroy_dev(dev);
101}
102
103/**
104 * pci_stop_and_remove_bus_device - remove a PCI device and any children
105 * @dev: the device to remove
106 *
107 * Remove a PCI device from the device lists, informing the drivers
108 * that the device has been removed. We also remove any subordinate
109 * buses and children in a depth-first manner.
110 *
111 * For each device we remove, delete the device structure from the
112 * device lists, remove the /proc entry, and notify userspace
113 * (/sbin/hotplug).
114 */
115void pci_stop_and_remove_bus_device(struct pci_dev *dev)
116{
117 pci_stop_bus_device(dev);
118 pci_remove_bus_device(dev);
119}
120EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
121
122void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
123{
124 pci_lock_rescan_remove();
125 pci_stop_and_remove_bus_device(dev);
126 pci_unlock_rescan_remove();
127}
128EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
129
130void pci_stop_root_bus(struct pci_bus *bus)
131{
132 struct pci_dev *child, *tmp;
133 struct pci_host_bridge *host_bridge;
134
135 if (!pci_is_root_bus(bus))
136 return;
137
138 host_bridge = to_pci_host_bridge(bus->bridge);
139 list_for_each_entry_safe_reverse(child, tmp,
140 &bus->devices, bus_list)
141 pci_stop_bus_device(child);
142
143 /* stop the host bridge */
144 device_release_driver(&host_bridge->dev);
145}
146EXPORT_SYMBOL_GPL(pci_stop_root_bus);
147
148void pci_remove_root_bus(struct pci_bus *bus)
149{
150 struct pci_dev *child, *tmp;
151 struct pci_host_bridge *host_bridge;
152
153 if (!pci_is_root_bus(bus))
154 return;
155
156 host_bridge = to_pci_host_bridge(bus->bridge);
157 list_for_each_entry_safe(child, tmp,
158 &bus->devices, bus_list)
159 pci_remove_bus_device(child);
160
161#ifdef CONFIG_PCI_DOMAINS_GENERIC
162 /* Release domain_nr if it was dynamically allocated */
163 if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
164 pci_bus_release_domain_nr(bus, host_bridge->dev.parent);
165#endif
166
167 pci_remove_bus(bus);
168 host_bridge->bus = NULL;
169
170 /* remove the host bridge */
171 device_del(&host_bridge->dev);
172}
173EXPORT_SYMBOL_GPL(pci_remove_root_bus);