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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 <linux/of.h>
5#include <linux/of_platform.h>
6#include <linux/platform_device.h>
7
8#include "pci.h"
9
10static 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
20static void pci_pwrctrl_unregister(struct device *dev)
21{
22 struct device_node *np;
23 struct platform_device *pdev;
24
25 np = dev_of_node(dev);
26 if (!np)
27 return;
28
29 pdev = of_find_device_by_node(np);
30 if (!pdev)
31 return;
32
33 of_device_unregister(pdev);
34 of_node_clear_flag(np, OF_POPULATED);
35}
36
37static void pci_stop_dev(struct pci_dev *dev)
38{
39 pci_pme_active(dev, false);
40
41 if (!pci_dev_test_and_clear_added(dev))
42 return;
43
44 pci_pwrctrl_unregister(&dev->dev);
45 device_release_driver(&dev->dev);
46 pci_proc_detach_device(dev);
47 pci_remove_sysfs_dev_files(dev);
48 of_pci_remove_node(dev);
49}
50
51static void pci_destroy_dev(struct pci_dev *dev)
52{
53 if (pci_dev_test_and_set_removed(dev))
54 return;
55
56 pci_npem_remove(dev);
57
58 device_del(&dev->dev);
59
60 down_write(&pci_bus_sem);
61 list_del(&dev->bus_list);
62 up_write(&pci_bus_sem);
63
64 pci_doe_destroy(dev);
65 pcie_aspm_exit_link_state(dev);
66 pci_bridge_d3_update(dev);
67 pci_free_resources(dev);
68 put_device(&dev->dev);
69}
70
71void pci_remove_bus(struct pci_bus *bus)
72{
73 pci_proc_detach_bus(bus);
74
75 down_write(&pci_bus_sem);
76 list_del(&bus->node);
77 pci_bus_release_busn_res(bus);
78 up_write(&pci_bus_sem);
79 pci_remove_legacy_files(bus);
80
81 if (bus->ops->remove_bus)
82 bus->ops->remove_bus(bus);
83
84 pcibios_remove_bus(bus);
85 device_unregister(&bus->dev);
86}
87EXPORT_SYMBOL(pci_remove_bus);
88
89static void pci_stop_bus_device(struct pci_dev *dev)
90{
91 struct pci_bus *bus = dev->subordinate;
92 struct pci_dev *child, *tmp;
93
94 /*
95 * Stopping an SR-IOV PF device removes all the associated VFs,
96 * which will update the bus->devices list and confuse the
97 * iterator. Therefore, iterate in reverse so we remove the VFs
98 * first, then the PF.
99 */
100 if (bus) {
101 list_for_each_entry_safe_reverse(child, tmp,
102 &bus->devices, bus_list)
103 pci_stop_bus_device(child);
104 }
105
106 pci_stop_dev(dev);
107}
108
109static void pci_remove_bus_device(struct pci_dev *dev)
110{
111 struct pci_bus *bus = dev->subordinate;
112 struct pci_dev *child, *tmp;
113
114 if (bus) {
115 list_for_each_entry_safe(child, tmp,
116 &bus->devices, bus_list)
117 pci_remove_bus_device(child);
118
119 pci_remove_bus(bus);
120 dev->subordinate = NULL;
121 }
122
123 pci_destroy_dev(dev);
124}
125
126/**
127 * pci_stop_and_remove_bus_device - remove a PCI device and any children
128 * @dev: the device to remove
129 *
130 * Remove a PCI device from the device lists, informing the drivers
131 * that the device has been removed. We also remove any subordinate
132 * buses and children in a depth-first manner.
133 *
134 * For each device we remove, delete the device structure from the
135 * device lists, remove the /proc entry, and notify userspace
136 * (/sbin/hotplug).
137 */
138void pci_stop_and_remove_bus_device(struct pci_dev *dev)
139{
140 pci_stop_bus_device(dev);
141 pci_remove_bus_device(dev);
142}
143EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
144
145void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
146{
147 pci_lock_rescan_remove();
148 pci_stop_and_remove_bus_device(dev);
149 pci_unlock_rescan_remove();
150}
151EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
152
153void pci_stop_root_bus(struct pci_bus *bus)
154{
155 struct pci_dev *child, *tmp;
156 struct pci_host_bridge *host_bridge;
157
158 if (!pci_is_root_bus(bus))
159 return;
160
161 host_bridge = to_pci_host_bridge(bus->bridge);
162 list_for_each_entry_safe_reverse(child, tmp,
163 &bus->devices, bus_list)
164 pci_stop_bus_device(child);
165
166 /* stop the host bridge */
167 device_release_driver(&host_bridge->dev);
168}
169EXPORT_SYMBOL_GPL(pci_stop_root_bus);
170
171void pci_remove_root_bus(struct pci_bus *bus)
172{
173 struct pci_dev *child, *tmp;
174 struct pci_host_bridge *host_bridge;
175
176 if (!pci_is_root_bus(bus))
177 return;
178
179 host_bridge = to_pci_host_bridge(bus->bridge);
180 list_for_each_entry_safe(child, tmp,
181 &bus->devices, bus_list)
182 pci_remove_bus_device(child);
183
184#ifdef CONFIG_PCI_DOMAINS_GENERIC
185 /* Release domain_nr if it was dynamically allocated */
186 if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
187 pci_bus_release_domain_nr(host_bridge->dev.parent, bus->domain_nr);
188#endif
189
190 pci_remove_bus(bus);
191 host_bridge->bus = NULL;
192
193 /* remove the host bridge */
194 device_del(&host_bridge->dev);
195}
196EXPORT_SYMBOL_GPL(pci_remove_root_bus);