Commit | Line | Data |
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7328c8f4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | #include <linux/pci.h> |
3 | #include <linux/module.h> | |
7d715a6c | 4 | #include <linux/pci-aspm.h> |
1da177e4 LT |
5 | #include "pci.h" |
6 | ||
04480094 RW |
7 | static void pci_free_resources(struct pci_dev *dev) |
8 | { | |
9 | int i; | |
10 | ||
04480094 RW |
11 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
12 | struct resource *res = dev->resource + i; | |
13 | if (res->parent) | |
14 | release_resource(res); | |
15 | } | |
16 | } | |
17 | ||
24f8aa9b | 18 | static void pci_stop_dev(struct pci_dev *dev) |
1da177e4 | 19 | { |
249bfb83 RW |
20 | pci_pme_active(dev, false); |
21 | ||
8a1bc901 | 22 | if (dev->is_added) { |
16b6c8bb | 23 | device_release_driver(&dev->dev); |
091ca9f0 RS |
24 | pci_proc_detach_device(dev); |
25 | pci_remove_sysfs_dev_files(dev); | |
8a1bc901 | 26 | dev->is_added = 0; |
091ca9f0 | 27 | } |
7d715a6c SL |
28 | |
29 | if (dev->bus->self) | |
30 | pcie_aspm_exit_link_state(dev); | |
24f8aa9b ST |
31 | } |
32 | ||
33 | static void pci_destroy_dev(struct pci_dev *dev) | |
34 | { | |
8a4c5c32 RW |
35 | if (!dev->dev.kobj.parent) |
36 | return; | |
37 | ||
c4a0a5d9 RW |
38 | device_del(&dev->dev); |
39 | ||
04480094 RW |
40 | down_write(&pci_bus_sem); |
41 | list_del(&dev->bus_list); | |
42 | up_write(&pci_bus_sem); | |
43 | ||
1ed276a7 | 44 | pci_bridge_d3_update(dev); |
04480094 | 45 | pci_free_resources(dev); |
e723f0b4 | 46 | put_device(&dev->dev); |
1da177e4 LT |
47 | } |
48 | ||
d563e2cc | 49 | void pci_remove_bus(struct pci_bus *bus) |
1da177e4 | 50 | { |
d563e2cc | 51 | pci_proc_detach_bus(bus); |
1da177e4 | 52 | |
d71374da | 53 | down_write(&pci_bus_sem); |
d563e2cc BH |
54 | list_del(&bus->node); |
55 | pci_bus_release_busn_res(bus); | |
d71374da | 56 | up_write(&pci_bus_sem); |
d563e2cc | 57 | pci_remove_legacy_files(bus); |
057bd2e0 TR |
58 | |
59 | if (bus->ops->remove_bus) | |
60 | bus->ops->remove_bus(bus); | |
61 | ||
10a95747 | 62 | pcibios_remove_bus(bus); |
d563e2cc | 63 | device_unregister(&bus->dev); |
1da177e4 LT |
64 | } |
65 | EXPORT_SYMBOL(pci_remove_bus); | |
66 | ||
3891b6ac | 67 | static void pci_stop_bus_device(struct pci_dev *dev) |
24f8aa9b | 68 | { |
2ed168ee BH |
69 | struct pci_bus *bus = dev->subordinate; |
70 | struct pci_dev *child, *tmp; | |
71 | ||
72 | /* | |
3891b6ac | 73 | * Stopping an SR-IOV PF device removes all the associated VFs, |
2ed168ee BH |
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 | */ | |
282e1d65 | 78 | if (bus) { |
2ed168ee BH |
79 | list_for_each_entry_safe_reverse(child, tmp, |
80 | &bus->devices, bus_list) | |
3891b6ac YL |
81 | pci_stop_bus_device(child); |
82 | } | |
83 | ||
84 | pci_stop_dev(dev); | |
85 | } | |
86 | ||
87 | static 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); | |
282e1d65 BH |
96 | |
97 | pci_remove_bus(bus); | |
98 | dev->subordinate = NULL; | |
99 | } | |
24f8aa9b | 100 | |
282e1d65 | 101 | pci_destroy_dev(dev); |
24f8aa9b | 102 | } |
3891b6ac YL |
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 | */ | |
116 | void pci_stop_and_remove_bus_device(struct pci_dev *dev) | |
117 | { | |
118 | pci_stop_bus_device(dev); | |
119 | pci_remove_bus_device(dev); | |
120 | } | |
210647af | 121 | EXPORT_SYMBOL(pci_stop_and_remove_bus_device); |
cdfcc572 | 122 | |
9d16947b RW |
123 | void 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 | } | |
129 | EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); | |
130 | ||
cdfcc572 YL |
131 | void 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 */ | |
e3b439e1 | 145 | device_release_driver(&host_bridge->dev); |
cdfcc572 | 146 | } |
e6b29dea | 147 | EXPORT_SYMBOL_GPL(pci_stop_root_bus); |
cdfcc572 YL |
148 | |
149 | void 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 | pci_remove_bus(bus); | |
162 | host_bridge->bus = NULL; | |
163 | ||
164 | /* remove the host bridge */ | |
e3b439e1 | 165 | device_unregister(&host_bridge->dev); |
cdfcc572 | 166 | } |
e6b29dea | 167 | EXPORT_SYMBOL_GPL(pci_remove_root_bus); |