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1#include <linux/pci.h>
2#include <linux/module.h>
3#include <linux/pci-aspm.h>
4#include "pci.h"
5
6static void pci_free_resources(struct pci_dev *dev)
7{
8 int i;
9
10 msi_remove_pci_irq_vectors(dev);
11
12 pci_cleanup_rom(dev);
13 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
14 struct resource *res = dev->resource + i;
15 if (res->parent)
16 release_resource(res);
17 }
18}
19
20static void pci_stop_dev(struct pci_dev *dev)
21{
22 if (dev->is_added) {
23 pci_proc_detach_device(dev);
24 pci_remove_sysfs_dev_files(dev);
25 device_unregister(&dev->dev);
26 dev->is_added = 0;
27 }
28
29 if (dev->bus->self)
30 pcie_aspm_exit_link_state(dev);
31}
32
33static void pci_destroy_dev(struct pci_dev *dev)
34{
35 /* Remove the device from the device lists, and prevent any further
36 * list accesses from this device */
37 down_write(&pci_bus_sem);
38 list_del(&dev->bus_list);
39 dev->bus_list.next = dev->bus_list.prev = NULL;
40 up_write(&pci_bus_sem);
41
42 pci_free_resources(dev);
43 pci_dev_put(dev);
44}
45
46/**
47 * pci_remove_device_safe - remove an unused hotplug device
48 * @dev: the device to remove
49 *
50 * Delete the device structure from the device lists and
51 * notify userspace (/sbin/hotplug), but only if the device
52 * in question is not being used by a driver.
53 * Returns 0 on success.
54 */
55#if 0
56int pci_remove_device_safe(struct pci_dev *dev)
57{
58 if (pci_dev_driver(dev))
59 return -EBUSY;
60 pci_destroy_dev(dev);
61 return 0;
62}
63#endif /* 0 */
64
65void pci_remove_bus(struct pci_bus *pci_bus)
66{
67 pci_proc_detach_bus(pci_bus);
68
69 down_write(&pci_bus_sem);
70 list_del(&pci_bus->node);
71 up_write(&pci_bus_sem);
72 if (!pci_bus->is_added)
73 return;
74
75 pci_remove_legacy_files(pci_bus);
76 device_unregister(&pci_bus->dev);
77}
78EXPORT_SYMBOL(pci_remove_bus);
79
80/**
81 * pci_remove_bus_device - remove a PCI device and any children
82 * @dev: the device to remove
83 *
84 * Remove a PCI device from the device lists, informing the drivers
85 * that the device has been removed. We also remove any subordinate
86 * buses and children in a depth-first manner.
87 *
88 * For each device we remove, delete the device structure from the
89 * device lists, remove the /proc entry, and notify userspace
90 * (/sbin/hotplug).
91 */
92void pci_remove_bus_device(struct pci_dev *dev)
93{
94 pci_stop_bus_device(dev);
95 if (dev->subordinate) {
96 struct pci_bus *b = dev->subordinate;
97
98 pci_remove_behind_bridge(dev);
99 pci_remove_bus(b);
100 dev->subordinate = NULL;
101 }
102
103 pci_destroy_dev(dev);
104}
105
106/**
107 * pci_remove_behind_bridge - remove all devices behind a PCI bridge
108 * @dev: PCI bridge device
109 *
110 * Remove all devices on the bus, except for the parent bridge.
111 * This also removes any child buses, and any devices they may
112 * contain in a depth-first manner.
113 */
114void pci_remove_behind_bridge(struct pci_dev *dev)
115{
116 struct list_head *l, *n;
117
118 if (dev->subordinate)
119 list_for_each_safe(l, n, &dev->subordinate->devices)
120 pci_remove_bus_device(pci_dev_b(l));
121}
122
123static void pci_stop_bus_devices(struct pci_bus *bus)
124{
125 struct list_head *l, *n;
126
127 list_for_each_safe(l, n, &bus->devices) {
128 struct pci_dev *dev = pci_dev_b(l);
129 pci_stop_bus_device(dev);
130 }
131}
132
133/**
134 * pci_stop_bus_device - stop a PCI device and any children
135 * @dev: the device to stop
136 *
137 * Stop a PCI device (detach the driver, remove from the global list
138 * and so on). This also stop any subordinate buses and children in a
139 * depth-first manner.
140 */
141void pci_stop_bus_device(struct pci_dev *dev)
142{
143 if (dev->subordinate)
144 pci_stop_bus_devices(dev->subordinate);
145
146 pci_stop_dev(dev);
147}
148
149EXPORT_SYMBOL(pci_remove_bus_device);
150EXPORT_SYMBOL(pci_remove_behind_bridge);
151EXPORT_SYMBOL_GPL(pci_stop_bus_device);
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 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
17static void pci_stop_dev(struct pci_dev *dev)
18{
19 pci_pme_active(dev, false);
20
21 if (pci_dev_is_added(dev)) {
22
23 device_release_driver(&dev->dev);
24 pci_proc_detach_device(dev);
25 pci_remove_sysfs_dev_files(dev);
26
27 pci_dev_assign_added(dev, false);
28 }
29}
30
31static 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 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 pci_remove_bus(bus);
161 host_bridge->bus = NULL;
162
163#ifdef CONFIG_PCI_DOMAINS_GENERIC
164 /* Release domain_nr if it was dynamically allocated */
165 if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
166 pci_bus_release_domain_nr(bus, host_bridge->dev.parent);
167#endif
168
169 /* remove the host bridge */
170 device_del(&host_bridge->dev);
171}
172EXPORT_SYMBOL_GPL(pci_remove_root_bus);