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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 of_pci_remove_node(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 pci_doe_destroy(dev);
43 pcie_aspm_exit_link_state(dev);
44 pci_bridge_d3_update(dev);
45 pci_free_resources(dev);
46 put_device(&dev->dev);
47}
48
49void 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}
65EXPORT_SYMBOL(pci_remove_bus);
66
67static 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
87static 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 */
116void pci_stop_and_remove_bus_device(struct pci_dev *dev)
117{
118 pci_stop_bus_device(dev);
119 pci_remove_bus_device(dev);
120}
121EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
122
123void 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}
129EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
130
131void 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}
147EXPORT_SYMBOL_GPL(pci_stop_root_bus);
148
149void 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
162#ifdef CONFIG_PCI_DOMAINS_GENERIC
163 /* Release domain_nr if it was dynamically allocated */
164 if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
165 pci_bus_release_domain_nr(bus, host_bridge->dev.parent);
166#endif
167
168 pci_remove_bus(bus);
169 host_bridge->bus = NULL;
170
171 /* remove the host bridge */
172 device_del(&host_bridge->dev);
173}
174EXPORT_SYMBOL_GPL(pci_remove_root_bus);
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);