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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 | ||
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 (dev->is_added) { | |
22 | device_release_driver(&dev->dev); | |
23 | pci_proc_detach_device(dev); | |
24 | pci_remove_sysfs_dev_files(dev); | |
25 | dev->is_added = 0; | |
26 | } | |
27 | ||
28 | if (dev->bus->self) | |
29 | pcie_aspm_exit_link_state(dev); | |
30 | } | |
31 | ||
32 | static void pci_destroy_dev(struct pci_dev *dev) | |
33 | { | |
34 | if (!dev->dev.kobj.parent) | |
35 | return; | |
36 | ||
37 | device_del(&dev->dev); | |
38 | ||
39 | down_write(&pci_bus_sem); | |
40 | list_del(&dev->bus_list); | |
41 | up_write(&pci_bus_sem); | |
42 | ||
43 | pci_bridge_d3_update(dev); | |
44 | pci_free_resources(dev); | |
45 | put_device(&dev->dev); | |
46 | } | |
47 | ||
48 | void pci_remove_bus(struct pci_bus *bus) | |
49 | { | |
50 | pci_proc_detach_bus(bus); | |
51 | ||
52 | down_write(&pci_bus_sem); | |
53 | list_del(&bus->node); | |
54 | pci_bus_release_busn_res(bus); | |
55 | up_write(&pci_bus_sem); | |
56 | pci_remove_legacy_files(bus); | |
57 | ||
58 | if (bus->ops->remove_bus) | |
59 | bus->ops->remove_bus(bus); | |
60 | ||
61 | pcibios_remove_bus(bus); | |
62 | device_unregister(&bus->dev); | |
63 | } | |
64 | EXPORT_SYMBOL(pci_remove_bus); | |
65 | ||
66 | static void pci_stop_bus_device(struct pci_dev *dev) | |
67 | { | |
68 | struct pci_bus *bus = dev->subordinate; | |
69 | struct pci_dev *child, *tmp; | |
70 | ||
71 | /* | |
72 | * Stopping an SR-IOV PF device removes all the associated VFs, | |
73 | * which will update the bus->devices list and confuse the | |
74 | * iterator. Therefore, iterate in reverse so we remove the VFs | |
75 | * first, then the PF. | |
76 | */ | |
77 | if (bus) { | |
78 | list_for_each_entry_safe_reverse(child, tmp, | |
79 | &bus->devices, bus_list) | |
80 | pci_stop_bus_device(child); | |
81 | } | |
82 | ||
83 | pci_stop_dev(dev); | |
84 | } | |
85 | ||
86 | static void pci_remove_bus_device(struct pci_dev *dev) | |
87 | { | |
88 | struct pci_bus *bus = dev->subordinate; | |
89 | struct pci_dev *child, *tmp; | |
90 | ||
91 | if (bus) { | |
92 | list_for_each_entry_safe(child, tmp, | |
93 | &bus->devices, bus_list) | |
94 | pci_remove_bus_device(child); | |
95 | ||
96 | pci_remove_bus(bus); | |
97 | dev->subordinate = NULL; | |
98 | } | |
99 | ||
100 | pci_destroy_dev(dev); | |
101 | } | |
102 | ||
103 | /** | |
104 | * pci_stop_and_remove_bus_device - remove a PCI device and any children | |
105 | * @dev: the device to remove | |
106 | * | |
107 | * Remove a PCI device from the device lists, informing the drivers | |
108 | * that the device has been removed. We also remove any subordinate | |
109 | * buses and children in a depth-first manner. | |
110 | * | |
111 | * For each device we remove, delete the device structure from the | |
112 | * device lists, remove the /proc entry, and notify userspace | |
113 | * (/sbin/hotplug). | |
114 | */ | |
115 | void pci_stop_and_remove_bus_device(struct pci_dev *dev) | |
116 | { | |
117 | pci_stop_bus_device(dev); | |
118 | pci_remove_bus_device(dev); | |
119 | } | |
120 | EXPORT_SYMBOL(pci_stop_and_remove_bus_device); | |
121 | ||
122 | void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev) | |
123 | { | |
124 | pci_lock_rescan_remove(); | |
125 | pci_stop_and_remove_bus_device(dev); | |
126 | pci_unlock_rescan_remove(); | |
127 | } | |
128 | EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); | |
129 | ||
130 | void pci_stop_root_bus(struct pci_bus *bus) | |
131 | { | |
132 | struct pci_dev *child, *tmp; | |
133 | struct pci_host_bridge *host_bridge; | |
134 | ||
135 | if (!pci_is_root_bus(bus)) | |
136 | return; | |
137 | ||
138 | host_bridge = to_pci_host_bridge(bus->bridge); | |
139 | list_for_each_entry_safe_reverse(child, tmp, | |
140 | &bus->devices, bus_list) | |
141 | pci_stop_bus_device(child); | |
142 | ||
143 | /* stop the host bridge */ | |
144 | device_release_driver(&host_bridge->dev); | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(pci_stop_root_bus); | |
147 | ||
148 | void pci_remove_root_bus(struct pci_bus *bus) | |
149 | { | |
150 | struct pci_dev *child, *tmp; | |
151 | struct pci_host_bridge *host_bridge; | |
152 | ||
153 | if (!pci_is_root_bus(bus)) | |
154 | return; | |
155 | ||
156 | host_bridge = to_pci_host_bridge(bus->bridge); | |
157 | list_for_each_entry_safe(child, tmp, | |
158 | &bus->devices, bus_list) | |
159 | pci_remove_bus_device(child); | |
160 | pci_remove_bus(bus); | |
161 | host_bridge->bus = NULL; | |
162 | ||
163 | /* remove the host bridge */ | |
164 | device_unregister(&host_bridge->dev); | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(pci_remove_root_bus); |