PCI/PM: Clean up PME state when removing a device
[linux-3.10.git] / drivers / pci / remove.c
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_unregister(&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         pci_dev_put(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 }