1 #include <linux/pci.h>
2 #include <linux/module.h>
3 #include <linux/pci-aspm.h>
4 #include "pci.h"
5
pci_free_resources(struct pci_dev * dev)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
pci_stop_dev(struct pci_dev * dev)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
pci_destroy_dev(struct pci_dev * dev)35 static void pci_destroy_dev(struct pci_dev *dev)
36 {
37 /* Remove the device from the device lists, and prevent any further
38 * list accesses from this device */
39 down_write(&pci_bus_sem);
40 list_del(&dev->bus_list);
41 dev->bus_list.next = dev->bus_list.prev = NULL;
42 up_write(&pci_bus_sem);
43
44 pci_free_resources(dev);
45 pci_dev_put(dev);
46 }
47
48 /**
49 * pci_remove_device_safe - remove an unused hotplug device
50 * @dev: the device to remove
51 *
52 * Delete the device structure from the device lists and
53 * notify userspace (/sbin/hotplug), but only if the device
54 * in question is not being used by a driver.
55 * Returns 0 on success.
56 */
57 #if 0
58 int pci_remove_device_safe(struct pci_dev *dev)
59 {
60 if (pci_dev_driver(dev))
61 return -EBUSY;
62 pci_destroy_dev(dev);
63 return 0;
64 }
65 #endif /* 0 */
66
pci_remove_bus(struct pci_bus * pci_bus)67 void pci_remove_bus(struct pci_bus *pci_bus)
68 {
69 pci_proc_detach_bus(pci_bus);
70
71 down_write(&pci_bus_sem);
72 list_del(&pci_bus->node);
73 up_write(&pci_bus_sem);
74 if (!pci_bus->is_added)
75 return;
76
77 pci_remove_legacy_files(pci_bus);
78 device_unregister(&pci_bus->dev);
79 }
80 EXPORT_SYMBOL(pci_remove_bus);
81
82 static void __pci_remove_behind_bridge(struct pci_dev *dev);
83 /**
84 * pci_stop_and_remove_bus_device - remove a PCI device and any children
85 * @dev: the device to remove
86 *
87 * Remove a PCI device from the device lists, informing the drivers
88 * that the device has been removed. We also remove any subordinate
89 * buses and children in a depth-first manner.
90 *
91 * For each device we remove, delete the device structure from the
92 * device lists, remove the /proc entry, and notify userspace
93 * (/sbin/hotplug).
94 */
__pci_remove_bus_device(struct pci_dev * dev)95 void __pci_remove_bus_device(struct pci_dev *dev)
96 {
97 if (dev->subordinate) {
98 struct pci_bus *b = dev->subordinate;
99
100 __pci_remove_behind_bridge(dev);
101 pci_remove_bus(b);
102 dev->subordinate = NULL;
103 }
104
105 pci_destroy_dev(dev);
106 }
107 EXPORT_SYMBOL(__pci_remove_bus_device);
108
pci_stop_and_remove_bus_device(struct pci_dev * dev)109 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
110 {
111 pci_stop_bus_device(dev);
112 __pci_remove_bus_device(dev);
113 }
114
__pci_remove_behind_bridge(struct pci_dev * dev)115 static void __pci_remove_behind_bridge(struct pci_dev *dev)
116 {
117 struct list_head *l, *n;
118
119 if (dev->subordinate)
120 list_for_each_safe(l, n, &dev->subordinate->devices)
121 __pci_remove_bus_device(pci_dev_b(l));
122 }
123
pci_stop_behind_bridge(struct pci_dev * dev)124 static void pci_stop_behind_bridge(struct pci_dev *dev)
125 {
126 struct list_head *l, *n;
127
128 if (dev->subordinate)
129 list_for_each_safe(l, n, &dev->subordinate->devices)
130 pci_stop_bus_device(pci_dev_b(l));
131 }
132
133 /**
134 * pci_stop_and_remove_behind_bridge - stop and remove all devices behind
135 * a PCI bridge
136 * @dev: PCI bridge device
137 *
138 * Remove all devices on the bus, except for the parent bridge.
139 * This also removes any child buses, and any devices they may
140 * contain in a depth-first manner.
141 */
pci_stop_and_remove_behind_bridge(struct pci_dev * dev)142 void pci_stop_and_remove_behind_bridge(struct pci_dev *dev)
143 {
144 pci_stop_behind_bridge(dev);
145 __pci_remove_behind_bridge(dev);
146 }
147
pci_stop_bus_devices(struct pci_bus * bus)148 static void pci_stop_bus_devices(struct pci_bus *bus)
149 {
150 struct list_head *l, *n;
151
152 /*
153 * VFs could be removed by pci_stop_and_remove_bus_device() in the
154 * pci_stop_bus_devices() code path for PF.
155 * aka, bus->devices get updated in the process.
156 * but VFs are inserted after PFs when SRIOV is enabled for PF,
157 * We can iterate the list backwards to get prev valid PF instead
158 * of removed VF.
159 */
160 list_for_each_prev_safe(l, n, &bus->devices) {
161 struct pci_dev *dev = pci_dev_b(l);
162 pci_stop_bus_device(dev);
163 }
164 }
165
166 /**
167 * pci_stop_bus_device - stop a PCI device and any children
168 * @dev: the device to stop
169 *
170 * Stop a PCI device (detach the driver, remove from the global list
171 * and so on). This also stop any subordinate buses and children in a
172 * depth-first manner.
173 */
pci_stop_bus_device(struct pci_dev * dev)174 void pci_stop_bus_device(struct pci_dev *dev)
175 {
176 if (dev->subordinate)
177 pci_stop_bus_devices(dev->subordinate);
178
179 pci_stop_dev(dev);
180 }
181
182 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
183 EXPORT_SYMBOL(pci_stop_and_remove_behind_bridge);
184 EXPORT_SYMBOL_GPL(pci_stop_bus_device);
185