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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 | 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 | |
20 | static void pci_stop_dev(struct pci_dev *dev) |
21 | { |
22 | pci_pme_active(dev, false); |
23 | |
24 | if (dev->is_added) { |
25 | pci_proc_detach_device(dev); |
26 | pci_remove_sysfs_dev_files(dev); |
27 | device_del(&dev->dev); |
28 | dev->is_added = 0; |
29 | } |
30 | |
31 | if (dev->bus->self) |
32 | pcie_aspm_exit_link_state(dev); |
33 | } |
34 | |
35 | static void pci_destroy_dev(struct pci_dev *dev) |
36 | { |
37 | down_write(&pci_bus_sem); |
38 | list_del(&dev->bus_list); |
39 | up_write(&pci_bus_sem); |
40 | |
41 | pci_free_resources(dev); |
42 | put_device(&dev->dev); |
43 | } |
44 | |
45 | void pci_remove_bus(struct pci_bus *bus) |
46 | { |
47 | pci_proc_detach_bus(bus); |
48 | |
49 | down_write(&pci_bus_sem); |
50 | list_del(&bus->node); |
51 | pci_bus_release_busn_res(bus); |
52 | up_write(&pci_bus_sem); |
53 | if (!bus->is_added) |
54 | return; |
55 | |
56 | pci_remove_legacy_files(bus); |
57 | device_unregister(&bus->dev); |
58 | } |
59 | EXPORT_SYMBOL(pci_remove_bus); |
60 | |
61 | static void pci_stop_bus_device(struct pci_dev *dev) |
62 | { |
63 | struct pci_bus *bus = dev->subordinate; |
64 | struct pci_dev *child, *tmp; |
65 | |
66 | /* |
67 | * Stopping an SR-IOV PF device removes all the associated VFs, |
68 | * which will update the bus->devices list and confuse the |
69 | * iterator. Therefore, iterate in reverse so we remove the VFs |
70 | * first, then the PF. |
71 | */ |
72 | if (bus) { |
73 | list_for_each_entry_safe_reverse(child, tmp, |
74 | &bus->devices, bus_list) |
75 | pci_stop_bus_device(child); |
76 | } |
77 | |
78 | pci_stop_dev(dev); |
79 | } |
80 | |
81 | static void pci_remove_bus_device(struct pci_dev *dev) |
82 | { |
83 | struct pci_bus *bus = dev->subordinate; |
84 | struct pci_dev *child, *tmp; |
85 | |
86 | if (bus) { |
87 | list_for_each_entry_safe(child, tmp, |
88 | &bus->devices, bus_list) |
89 | pci_remove_bus_device(child); |
90 | |
91 | pci_remove_bus(bus); |
92 | dev->subordinate = NULL; |
93 | } |
94 | |
95 | pci_destroy_dev(dev); |
96 | } |
97 | |
98 | /** |
99 | * pci_stop_and_remove_bus_device - remove a PCI device and any children |
100 | * @dev: the device to remove |
101 | * |
102 | * Remove a PCI device from the device lists, informing the drivers |
103 | * that the device has been removed. We also remove any subordinate |
104 | * buses and children in a depth-first manner. |
105 | * |
106 | * For each device we remove, delete the device structure from the |
107 | * device lists, remove the /proc entry, and notify userspace |
108 | * (/sbin/hotplug). |
109 | */ |
110 | void pci_stop_and_remove_bus_device(struct pci_dev *dev) |
111 | { |
112 | pci_stop_bus_device(dev); |
113 | pci_remove_bus_device(dev); |
114 | } |
115 | EXPORT_SYMBOL(pci_stop_and_remove_bus_device); |
116 | |
117 | void pci_stop_root_bus(struct pci_bus *bus) |
118 | { |
119 | struct pci_dev *child, *tmp; |
120 | struct pci_host_bridge *host_bridge; |
121 | |
122 | if (!pci_is_root_bus(bus)) |
123 | return; |
124 | |
125 | host_bridge = to_pci_host_bridge(bus->bridge); |
126 | list_for_each_entry_safe_reverse(child, tmp, |
127 | &bus->devices, bus_list) |
128 | pci_stop_bus_device(child); |
129 | |
130 | /* stop the host bridge */ |
131 | device_del(&host_bridge->dev); |
132 | } |
133 | |
134 | void pci_remove_root_bus(struct pci_bus *bus) |
135 | { |
136 | struct pci_dev *child, *tmp; |
137 | struct pci_host_bridge *host_bridge; |
138 | |
139 | if (!pci_is_root_bus(bus)) |
140 | return; |
141 | |
142 | host_bridge = to_pci_host_bridge(bus->bridge); |
143 | list_for_each_entry_safe(child, tmp, |
144 | &bus->devices, bus_list) |
145 | pci_remove_bus_device(child); |
146 | pci_remove_bus(bus); |
147 | host_bridge->bus = NULL; |
148 | |
149 | /* remove the host bridge */ |
150 | put_device(&host_bridge->dev); |
151 | } |
152 |
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