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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 | pci_cleanup_rom(dev); | |
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 | ||
18 | static void pci_stop_dev(struct pci_dev *dev) | |
19 | { | |
20 | pci_pme_active(dev, false); | |
21 | ||
22 | if (dev->is_added) { | |
23 | pci_proc_detach_device(dev); | |
24 | pci_remove_sysfs_dev_files(dev); | |
25 | device_release_driver(&dev->dev); | |
26 | dev->is_added = 0; | |
27 | } | |
28 | ||
29 | if (dev->bus->self) | |
30 | pcie_aspm_exit_link_state(dev); | |
31 | } | |
32 | ||
33 | static void pci_destroy_dev(struct pci_dev *dev) | |
34 | { | |
35 | if (!dev->dev.kobj.parent) | |
36 | return; | |
37 | ||
38 | device_del(&dev->dev); | |
39 | ||
40 | down_write(&pci_bus_sem); | |
41 | list_del(&dev->bus_list); | |
42 | up_write(&pci_bus_sem); | |
43 | ||
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 | pcibios_remove_bus(bus); | |
58 | device_unregister(&bus->dev); | |
59 | } | |
60 | EXPORT_SYMBOL(pci_remove_bus); | |
61 | ||
62 | static void pci_stop_bus_device(struct pci_dev *dev) | |
63 | { | |
64 | struct pci_bus *bus = dev->subordinate; | |
65 | struct pci_dev *child, *tmp; | |
66 | ||
67 | /* | |
68 | * Stopping an SR-IOV PF device removes all the associated VFs, | |
69 | * which will update the bus->devices list and confuse the | |
70 | * iterator. Therefore, iterate in reverse so we remove the VFs | |
71 | * first, then the PF. | |
72 | */ | |
73 | if (bus) { | |
74 | list_for_each_entry_safe_reverse(child, tmp, | |
75 | &bus->devices, bus_list) | |
76 | pci_stop_bus_device(child); | |
77 | } | |
78 | ||
79 | pci_stop_dev(dev); | |
80 | } | |
81 | ||
82 | static void pci_remove_bus_device(struct pci_dev *dev) | |
83 | { | |
84 | struct pci_bus *bus = dev->subordinate; | |
85 | struct pci_dev *child, *tmp; | |
86 | ||
87 | if (bus) { | |
88 | list_for_each_entry_safe(child, tmp, | |
89 | &bus->devices, bus_list) | |
90 | pci_remove_bus_device(child); | |
91 | ||
92 | pci_remove_bus(bus); | |
93 | dev->subordinate = NULL; | |
94 | } | |
95 | ||
96 | pci_destroy_dev(dev); | |
97 | } | |
98 | ||
99 | /** | |
100 | * pci_stop_and_remove_bus_device - remove a PCI device and any children | |
101 | * @dev: the device to remove | |
102 | * | |
103 | * Remove a PCI device from the device lists, informing the drivers | |
104 | * that the device has been removed. We also remove any subordinate | |
105 | * buses and children in a depth-first manner. | |
106 | * | |
107 | * For each device we remove, delete the device structure from the | |
108 | * device lists, remove the /proc entry, and notify userspace | |
109 | * (/sbin/hotplug). | |
110 | */ | |
111 | void pci_stop_and_remove_bus_device(struct pci_dev *dev) | |
112 | { | |
113 | pci_stop_bus_device(dev); | |
114 | pci_remove_bus_device(dev); | |
115 | } | |
116 | EXPORT_SYMBOL(pci_stop_and_remove_bus_device); | |
117 | ||
118 | void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev) | |
119 | { | |
120 | pci_lock_rescan_remove(); | |
121 | pci_stop_and_remove_bus_device(dev); | |
122 | pci_unlock_rescan_remove(); | |
123 | } | |
124 | EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked); | |
125 | ||
126 | void pci_stop_root_bus(struct pci_bus *bus) | |
127 | { | |
128 | struct pci_dev *child, *tmp; | |
129 | struct pci_host_bridge *host_bridge; | |
130 | ||
131 | if (!pci_is_root_bus(bus)) | |
132 | return; | |
133 | ||
134 | host_bridge = to_pci_host_bridge(bus->bridge); | |
135 | list_for_each_entry_safe_reverse(child, tmp, | |
136 | &bus->devices, bus_list) | |
137 | pci_stop_bus_device(child); | |
138 | ||
139 | /* stop the host bridge */ | |
140 | device_release_driver(&host_bridge->dev); | |
141 | } | |
142 | ||
143 | void pci_remove_root_bus(struct pci_bus *bus) | |
144 | { | |
145 | struct pci_dev *child, *tmp; | |
146 | struct pci_host_bridge *host_bridge; | |
147 | ||
148 | if (!pci_is_root_bus(bus)) | |
149 | return; | |
150 | ||
151 | host_bridge = to_pci_host_bridge(bus->bridge); | |
152 | list_for_each_entry_safe(child, tmp, | |
153 | &bus->devices, bus_list) | |
154 | pci_remove_bus_device(child); | |
155 | pci_remove_bus(bus); | |
156 | host_bridge->bus = NULL; | |
157 | ||
158 | /* remove the host bridge */ | |
159 | device_unregister(&host_bridge->dev); | |
160 | } |