blob: fd77e2bde2e8feadc7c5b1cceab94374f00100fe [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/pci.h>
2#include <linux/module.h>
Shaohua Li7d715a62008-02-25 09:46:41 +08003#include <linux/pci-aspm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#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
Satoru Takeuchi24f8aa92006-09-12 10:16:36 -070020static void pci_stop_dev(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070021{
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -080022 if (dev->is_added) {
Rajesh Shah091ca9f2005-04-28 00:25:49 -070023 pci_proc_detach_device(dev);
24 pci_remove_sysfs_dev_files(dev);
25 device_unregister(&dev->dev);
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -080026 dev->is_added = 0;
Rajesh Shah091ca9f2005-04-28 00:25:49 -070027 }
Shaohua Li7d715a62008-02-25 09:46:41 +080028
29 if (dev->bus->self)
30 pcie_aspm_exit_link_state(dev);
Satoru Takeuchi24f8aa92006-09-12 10:16:36 -070031}
32
33static void pci_destroy_dev(struct pci_dev *dev)
34{
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 /* Remove the device from the device lists, and prevent any further
36 * list accesses from this device */
Zhang Yanmind71374d2006-06-02 12:35:43 +080037 down_write(&pci_bus_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 list_del(&dev->bus_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 dev->bus_list.next = dev->bus_list.prev = NULL;
Zhang Yanmind71374d2006-06-02 12:35:43 +080040 up_write(&pci_bus_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
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 */
Adrian Bunk54c762f2005-12-22 01:08:52 +010055#if 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070056int 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}
Adrian Bunk54c762f2005-12-22 01:08:52 +010063#endif /* 0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65void pci_remove_bus(struct pci_bus *pci_bus)
66{
67 pci_proc_detach_bus(pci_bus);
68
Zhang Yanmind71374d2006-06-02 12:35:43 +080069 down_write(&pci_bus_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 list_del(&pci_bus->node);
Zhang Yanmind71374d2006-06-02 12:35:43 +080071 up_write(&pci_bus_sem);
Yu Zhao2b563132009-01-28 18:27:21 +080072 if (!pci_bus->is_added)
73 return;
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 pci_remove_legacy_files(pci_bus);
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -040076 device_unregister(&pci_bus->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
78EXPORT_SYMBOL(pci_remove_bus);
79
Yinghai Lu3682a392012-02-04 22:55:00 -080080static void __pci_remove_behind_bridge(struct pci_dev *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081/**
Yinghai Lu210647a2012-02-25 13:54:20 -080082 * pci_stop_and_remove_bus_device - remove a PCI device and any children
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 * @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 */
Yinghai Lu6b22cf32012-02-25 13:54:21 -080093void __pci_remove_bus_device(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070094{
95 if (dev->subordinate) {
96 struct pci_bus *b = dev->subordinate;
97
Yinghai Lu3682a392012-02-04 22:55:00 -080098 __pci_remove_behind_bridge(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 pci_remove_bus(b);
100 dev->subordinate = NULL;
101 }
102
103 pci_destroy_dev(dev);
104}
Yinghai Lu6b22cf32012-02-25 13:54:21 -0800105EXPORT_SYMBOL(__pci_remove_bus_device);
106
Yinghai Lu210647a2012-02-25 13:54:20 -0800107void pci_stop_and_remove_bus_device(struct pci_dev *dev)
Yinghai Lu79cc9602011-11-22 21:06:53 -0800108{
109 pci_stop_bus_device(dev);
110 __pci_remove_bus_device(dev);
111}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Yinghai Lu3682a392012-02-04 22:55:00 -0800113static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131/**
Yinghai Lu6754b9e2012-02-25 13:54:22 -0800132 * pci_stop_and_remove_behind_bridge - stop and remove all devices behind
133 * a PCI bridge
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 * @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 */
Yinghai Lu6754b9e2012-02-25 13:54:22 -0800140void pci_stop_and_remove_behind_bridge(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
Yinghai Lu3682a392012-02-04 22:55:00 -0800142 pci_stop_behind_bridge(dev);
143 __pci_remove_behind_bridge(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
145
Satoru Takeuchi24f8aa92006-09-12 10:16:36 -0700146static void pci_stop_bus_devices(struct pci_bus *bus)
147{
148 struct list_head *l, *n;
149
Yinghai Luac205b72012-01-27 10:55:09 -0800150 /*
Yinghai Lu210647a2012-02-25 13:54:20 -0800151 * VFs could be removed by pci_stop_and_remove_bus_device() in the
Yinghai Luac205b72012-01-27 10:55:09 -0800152 * 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) {
Satoru Takeuchi24f8aa92006-09-12 10:16:36 -0700159 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
Yinghai Lu210647a2012-02-25 13:54:20 -0800180EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
Yinghai Lu6754b9e2012-02-25 13:54:22 -0800181EXPORT_SYMBOL(pci_stop_and_remove_behind_bridge);
Satoru Takeuchi24f8aa92006-09-12 10:16:36 -0700182EXPORT_SYMBOL_GPL(pci_stop_bus_device);