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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
6static 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
20static void pci_stop_dev(struct pci_dev *dev)
21{
22 if (dev->is_added) {
23 pci_proc_detach_device(dev);
24 pci_remove_sysfs_dev_files(dev);
25 device_unregister(&dev->dev);
26 dev->is_added = 0;
27 }
28
29 if (dev->bus->self)
30 pcie_aspm_exit_link_state(dev);
31}
32
33static void pci_destroy_dev(struct pci_dev *dev)
34{
35 /* Remove the device from the device lists, and prevent any further
36 * list accesses from this device */
37 down_write(&pci_bus_sem);
38 list_del(&dev->bus_list);
39 dev->bus_list.next = dev->bus_list.prev = NULL;
40 up_write(&pci_bus_sem);
41
42 pci_free_resources(dev);
43 pci_dev_put(dev);
44}
45
46/**
47 * pci_remove_device_safe - remove an unused hotplug device
48 * @dev: the device to remove
49 *
50 * Delete the device structure from the device lists and
51 * notify userspace (/sbin/hotplug), but only if the device
52 * in question is not being used by a driver.
53 * Returns 0 on success.
54 */
55#if 0
56int pci_remove_device_safe(struct pci_dev *dev)
57{
58 if (pci_dev_driver(dev))
59 return -EBUSY;
60 pci_destroy_dev(dev);
61 return 0;
62}
63#endif /* 0 */
64
65void pci_remove_bus(struct pci_bus *pci_bus)
66{
67 pci_proc_detach_bus(pci_bus);
68
69 down_write(&pci_bus_sem);
70 list_del(&pci_bus->node);
71 up_write(&pci_bus_sem);
72 if (!pci_bus->is_added)
73 return;
74
75 pci_remove_legacy_files(pci_bus);
76 device_unregister(&pci_bus->dev);
77}
78EXPORT_SYMBOL(pci_remove_bus);
79
80static void __pci_remove_behind_bridge(struct pci_dev *dev);
81/**
82 * pci_stop_and_remove_bus_device - remove a PCI device and any children
83 * @dev: the device to remove
84 *
85 * Remove a PCI device from the device lists, informing the drivers
86 * that the device has been removed. We also remove any subordinate
87 * buses and children in a depth-first manner.
88 *
89 * For each device we remove, delete the device structure from the
90 * device lists, remove the /proc entry, and notify userspace
91 * (/sbin/hotplug).
92 */
93void __pci_remove_bus_device(struct pci_dev *dev)
94{
95 if (dev->subordinate) {
96 struct pci_bus *b = dev->subordinate;
97
98 __pci_remove_behind_bridge(dev);
99 pci_remove_bus(b);
100 dev->subordinate = NULL;
101 }
102
103 pci_destroy_dev(dev);
104}
105EXPORT_SYMBOL(__pci_remove_bus_device);
106
107void pci_stop_and_remove_bus_device(struct pci_dev *dev)
108{
109 pci_stop_bus_device(dev);
110 __pci_remove_bus_device(dev);
111}
112
113static void __pci_remove_behind_bridge(struct pci_dev *dev)
114{
115 struct list_head *l, *n;
116
117 if (dev->subordinate)
118 list_for_each_safe(l, n, &dev->subordinate->devices)
119 __pci_remove_bus_device(pci_dev_b(l));
120}
121
122static void pci_stop_behind_bridge(struct pci_dev *dev)
123{
124 struct list_head *l, *n;
125
126 if (dev->subordinate)
127 list_for_each_safe(l, n, &dev->subordinate->devices)
128 pci_stop_bus_device(pci_dev_b(l));
129}
130
131/**
132 * pci_stop_and_remove_behind_bridge - stop and remove all devices behind
133 * a PCI bridge
134 * @dev: PCI bridge device
135 *
136 * Remove all devices on the bus, except for the parent bridge.
137 * This also removes any child buses, and any devices they may
138 * contain in a depth-first manner.
139 */
140void pci_stop_and_remove_behind_bridge(struct pci_dev *dev)
141{
142 pci_stop_behind_bridge(dev);
143 __pci_remove_behind_bridge(dev);
144}
145
146static void pci_stop_bus_devices(struct pci_bus *bus)
147{
148 struct list_head *l, *n;
149
150 /*
151 * VFs could be removed by pci_stop_and_remove_bus_device() in the
152 * pci_stop_bus_devices() code path for PF.
153 * aka, bus->devices get updated in the process.
154 * but VFs are inserted after PFs when SRIOV is enabled for PF,
155 * We can iterate the list backwards to get prev valid PF instead
156 * of removed VF.
157 */
158 list_for_each_prev_safe(l, n, &bus->devices) {
159 struct pci_dev *dev = pci_dev_b(l);
160 pci_stop_bus_device(dev);
161 }
162}
163
164/**
165 * pci_stop_bus_device - stop a PCI device and any children
166 * @dev: the device to stop
167 *
168 * Stop a PCI device (detach the driver, remove from the global list
169 * and so on). This also stop any subordinate buses and children in a
170 * depth-first manner.
171 */
172void pci_stop_bus_device(struct pci_dev *dev)
173{
174 if (dev->subordinate)
175 pci_stop_bus_devices(dev->subordinate);
176
177 pci_stop_dev(dev);
178}
179
180EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
181EXPORT_SYMBOL(pci_stop_and_remove_behind_bridge);
182EXPORT_SYMBOL_GPL(pci_stop_bus_device);
1#include <linux/pci.h>
2#include <linux/module.h>
3#include <linux/pci-aspm.h>
4#include "pci.h"
5
6static 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
20static void pci_stop_dev(struct pci_dev *dev)
21{
22 if (dev->is_added) {
23 pci_proc_detach_device(dev);
24 pci_remove_sysfs_dev_files(dev);
25 device_unregister(&dev->dev);
26 dev->is_added = 0;
27 }
28
29 if (dev->bus->self)
30 pcie_aspm_exit_link_state(dev);
31}
32
33static void pci_destroy_dev(struct pci_dev *dev)
34{
35 /* Remove the device from the device lists, and prevent any further
36 * list accesses from this device */
37 down_write(&pci_bus_sem);
38 list_del(&dev->bus_list);
39 dev->bus_list.next = dev->bus_list.prev = NULL;
40 up_write(&pci_bus_sem);
41
42 pci_free_resources(dev);
43 pci_dev_put(dev);
44}
45
46/**
47 * pci_remove_device_safe - remove an unused hotplug device
48 * @dev: the device to remove
49 *
50 * Delete the device structure from the device lists and
51 * notify userspace (/sbin/hotplug), but only if the device
52 * in question is not being used by a driver.
53 * Returns 0 on success.
54 */
55#if 0
56int pci_remove_device_safe(struct pci_dev *dev)
57{
58 if (pci_dev_driver(dev))
59 return -EBUSY;
60 pci_destroy_dev(dev);
61 return 0;
62}
63#endif /* 0 */
64
65void pci_remove_bus(struct pci_bus *pci_bus)
66{
67 pci_proc_detach_bus(pci_bus);
68
69 down_write(&pci_bus_sem);
70 list_del(&pci_bus->node);
71 up_write(&pci_bus_sem);
72 if (!pci_bus->is_added)
73 return;
74
75 pci_remove_legacy_files(pci_bus);
76 device_unregister(&pci_bus->dev);
77}
78EXPORT_SYMBOL(pci_remove_bus);
79
80/**
81 * pci_remove_bus_device - remove a PCI device and any children
82 * @dev: the device to remove
83 *
84 * Remove a PCI device from the device lists, informing the drivers
85 * that the device has been removed. We also remove any subordinate
86 * buses and children in a depth-first manner.
87 *
88 * For each device we remove, delete the device structure from the
89 * device lists, remove the /proc entry, and notify userspace
90 * (/sbin/hotplug).
91 */
92void pci_remove_bus_device(struct pci_dev *dev)
93{
94 pci_stop_bus_device(dev);
95 if (dev->subordinate) {
96 struct pci_bus *b = dev->subordinate;
97
98 pci_remove_behind_bridge(dev);
99 pci_remove_bus(b);
100 dev->subordinate = NULL;
101 }
102
103 pci_destroy_dev(dev);
104}
105
106/**
107 * pci_remove_behind_bridge - remove all devices behind a PCI bridge
108 * @dev: PCI bridge device
109 *
110 * Remove all devices on the bus, except for the parent bridge.
111 * This also removes any child buses, and any devices they may
112 * contain in a depth-first manner.
113 */
114void pci_remove_behind_bridge(struct pci_dev *dev)
115{
116 struct list_head *l, *n;
117
118 if (dev->subordinate)
119 list_for_each_safe(l, n, &dev->subordinate->devices)
120 pci_remove_bus_device(pci_dev_b(l));
121}
122
123static void pci_stop_bus_devices(struct pci_bus *bus)
124{
125 struct list_head *l, *n;
126
127 list_for_each_safe(l, n, &bus->devices) {
128 struct pci_dev *dev = pci_dev_b(l);
129 pci_stop_bus_device(dev);
130 }
131}
132
133/**
134 * pci_stop_bus_device - stop a PCI device and any children
135 * @dev: the device to stop
136 *
137 * Stop a PCI device (detach the driver, remove from the global list
138 * and so on). This also stop any subordinate buses and children in a
139 * depth-first manner.
140 */
141void pci_stop_bus_device(struct pci_dev *dev)
142{
143 if (dev->subordinate)
144 pci_stop_bus_devices(dev->subordinate);
145
146 pci_stop_dev(dev);
147}
148
149EXPORT_SYMBOL(pci_remove_bus_device);
150EXPORT_SYMBOL(pci_remove_behind_bridge);
151EXPORT_SYMBOL_GPL(pci_stop_bus_device);