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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
80static void __pci_remove_behind_bridge(struct pci_dev *dev);
81/**
82 * pci_stop_and_remove_bus_device - remove a PCI device and any children
83 * @dev: the device to remove
84 *
85 * Remove a PCI device from the device lists, informing the drivers
86 * that the device has been removed. We also remove any subordinate
87 * buses and children in a depth-first manner.
88 *
89 * For each device we remove, delete the device structure from the
90 * device lists, remove the /proc entry, and notify userspace
91 * (/sbin/hotplug).
92 */
93void __pci_remove_bus_device(struct pci_dev *dev)
94{
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}
105EXPORT_SYMBOL(__pci_remove_bus_device);
106
107void pci_stop_and_remove_bus_device(struct pci_dev *dev)
108{
109 pci_stop_bus_device(dev);
110 __pci_remove_bus_device(dev);
111}
112
113static void __pci_remove_behind_bridge(struct pci_dev *dev)
114{
115 struct list_head *l, *n;
116
117 if (dev->subordinate)
118 list_for_each_safe(l, n, &dev->subordinate->devices)
119 __pci_remove_bus_device(pci_dev_b(l));
120}
121
122static void pci_stop_behind_bridge(struct pci_dev *dev)
123{
124 struct list_head *l, *n;
125
126 if (dev->subordinate)
127 list_for_each_safe(l, n, &dev->subordinate->devices)
128 pci_stop_bus_device(pci_dev_b(l));
129}
130
131/**
132 * pci_stop_and_remove_behind_bridge - stop and remove all devices behind
133 * a PCI bridge
134 * @dev: PCI bridge device
135 *
136 * Remove all devices on the bus, except for the parent bridge.
137 * This also removes any child buses, and any devices they may
138 * contain in a depth-first manner.
139 */
140void pci_stop_and_remove_behind_bridge(struct pci_dev *dev)
141{
142 pci_stop_behind_bridge(dev);
143 __pci_remove_behind_bridge(dev);
144}
145
146static void pci_stop_bus_devices(struct pci_bus *bus)
147{
148 struct list_head *l, *n;
149
150 /*
151 * VFs could be removed by pci_stop_and_remove_bus_device() in the
152 * pci_stop_bus_devices() code path for PF.
153 * aka, bus->devices get updated in the process.
154 * but VFs are inserted after PFs when SRIOV is enabled for PF,
155 * We can iterate the list backwards to get prev valid PF instead
156 * of removed VF.
157 */
158 list_for_each_prev_safe(l, n, &bus->devices) {
159 struct pci_dev *dev = pci_dev_b(l);
160 pci_stop_bus_device(dev);
161 }
162}
163
164/**
165 * pci_stop_bus_device - stop a PCI device and any children
166 * @dev: the device to stop
167 *
168 * Stop a PCI device (detach the driver, remove from the global list
169 * and so on). This also stop any subordinate buses and children in a
170 * depth-first manner.
171 */
172void pci_stop_bus_device(struct pci_dev *dev)
173{
174 if (dev->subordinate)
175 pci_stop_bus_devices(dev->subordinate);
176
177 pci_stop_dev(dev);
178}
179
180EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
181EXPORT_SYMBOL(pci_stop_and_remove_behind_bridge);
182EXPORT_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 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 pcie_aspm_exit_link_state(dev);
42 pci_bridge_d3_update(dev);
43 pci_free_resources(dev);
44 put_device(&dev->dev);
45}
46
47void 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}
63EXPORT_SYMBOL(pci_remove_bus);
64
65static 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
85static 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 */
114void pci_stop_and_remove_bus_device(struct pci_dev *dev)
115{
116 pci_stop_bus_device(dev);
117 pci_remove_bus_device(dev);
118}
119EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
120
121void 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}
127EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
128
129void 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}
145EXPORT_SYMBOL_GPL(pci_stop_root_bus);
146
147void 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_unregister(&host_bridge->dev);
164}
165EXPORT_SYMBOL_GPL(pci_remove_root_bus);