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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 | ||
6 | static 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 | ||
17 | static 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 | ||
30 | static 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 | ||
47 | void 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 | } | |
63 | EXPORT_SYMBOL(pci_remove_bus); | |
64 | ||
65 | static 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 | ||
85 | static 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 | */ | |
114 | void pci_stop_and_remove_bus_device(struct pci_dev *dev) | |
115 | { | |
116 | pci_stop_bus_device(dev); | |
117 | pci_remove_bus_device(dev); | |
118 | } | |
119 | EXPORT_SYMBOL(pci_stop_and_remove_bus_device); | |
120 | ||
121 | void 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 | } | |
127 | EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); | |
128 | ||
129 | void 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 | } | |
145 | EXPORT_SYMBOL_GPL(pci_stop_root_bus); | |
146 | ||
147 | void 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_del(&host_bridge->dev); | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(pci_remove_root_bus); |