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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
Rafael J. Wysocki04480092014-02-01 15:38:29 +01006static void pci_free_resources(struct pci_dev *dev)
7{
8 int i;
9
10 pci_cleanup_rom(dev);
11 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
12 struct resource *res = dev->resource + i;
13 if (res->parent)
14 release_resource(res);
15 }
16}
17
Satoru Takeuchi24f8aa92006-09-12 10:16:36 -070018static void pci_stop_dev(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070019{
Rafael J. Wysocki249bfb82013-02-11 20:49:49 +010020 pci_pme_active(dev, false);
21
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);
Rafael J. Wysockic4a0a5d2013-12-18 13:53:32 -070025 device_release_driver(&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{
Rafael J. Wysocki8a4c5c32014-01-14 12:04:51 -070035 if (!dev->dev.kobj.parent)
36 return;
37
Rafael J. Wysockic4a0a5d2013-12-18 13:53:32 -070038 device_del(&dev->dev);
39
Rafael J. Wysocki04480092014-02-01 15:38:29 +010040 down_write(&pci_bus_sem);
41 list_del(&dev->bus_list);
42 up_write(&pci_bus_sem);
43
44 pci_free_resources(dev);
Jiang Liue723f0b2013-01-21 13:20:46 -080045 put_device(&dev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046}
47
Bjorn Helgaasd563e2c2012-08-16 20:43:11 -060048void pci_remove_bus(struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
Bjorn Helgaasd563e2c2012-08-16 20:43:11 -060050 pci_proc_detach_bus(bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Zhang Yanmind71374d2006-06-02 12:35:43 +080052 down_write(&pci_bus_sem);
Bjorn Helgaasd563e2c2012-08-16 20:43:11 -060053 list_del(&bus->node);
54 pci_bus_release_busn_res(bus);
Zhang Yanmind71374d2006-06-02 12:35:43 +080055 up_write(&pci_bus_sem);
Bjorn Helgaasd563e2c2012-08-16 20:43:11 -060056 pci_remove_legacy_files(bus);
Jiang Liu10a95742013-04-12 05:44:20 +000057 pcibios_remove_bus(bus);
Bjorn Helgaasd563e2c2012-08-16 20:43:11 -060058 device_unregister(&bus->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059}
60EXPORT_SYMBOL(pci_remove_bus);
61
Yinghai Lu3891b6a2012-09-19 11:54:20 -070062static void pci_stop_bus_device(struct pci_dev *dev)
63{
64 struct pci_bus *bus = dev->subordinate;
65 struct pci_dev *child, *tmp;
66
67 /*
68 * Stopping an SR-IOV PF device removes all the associated VFs,
69 * which will update the bus->devices list and confuse the
70 * iterator. Therefore, iterate in reverse so we remove the VFs
71 * first, then the PF.
72 */
73 if (bus) {
74 list_for_each_entry_safe_reverse(child, tmp,
75 &bus->devices, bus_list)
76 pci_stop_bus_device(child);
77 }
78
79 pci_stop_dev(dev);
80}
81
82static void pci_remove_bus_device(struct pci_dev *dev)
83{
84 struct pci_bus *bus = dev->subordinate;
85 struct pci_dev *child, *tmp;
86
87 if (bus) {
88 list_for_each_entry_safe(child, tmp,
89 &bus->devices, bus_list)
90 pci_remove_bus_device(child);
91
92 pci_remove_bus(bus);
93 dev->subordinate = NULL;
94 }
95
96 pci_destroy_dev(dev);
97}
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099/**
Yinghai Lu210647a2012-02-25 13:54:20 -0800100 * pci_stop_and_remove_bus_device - remove a PCI device and any children
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 * @dev: the device to remove
102 *
103 * Remove a PCI device from the device lists, informing the drivers
104 * that the device has been removed. We also remove any subordinate
105 * buses and children in a depth-first manner.
106 *
107 * For each device we remove, delete the device structure from the
108 * device lists, remove the /proc entry, and notify userspace
109 * (/sbin/hotplug).
110 */
Yinghai Lu210647a2012-02-25 13:54:20 -0800111void pci_stop_and_remove_bus_device(struct pci_dev *dev)
Yinghai Lu79cc9602011-11-22 21:06:53 -0800112{
Yinghai Lu3891b6a2012-09-19 11:54:20 -0700113 pci_stop_bus_device(dev);
114 pci_remove_bus_device(dev);
Satoru Takeuchi24f8aa92006-09-12 10:16:36 -0700115}
Yinghai Lu210647a2012-02-25 13:54:20 -0800116EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
Yinghai Lucdfcc572012-10-30 14:31:38 -0600117
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100118void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
119{
120 pci_lock_rescan_remove();
121 pci_stop_and_remove_bus_device(dev);
122 pci_unlock_rescan_remove();
123}
124EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
125
Yinghai Lucdfcc572012-10-30 14:31:38 -0600126void pci_stop_root_bus(struct pci_bus *bus)
127{
128 struct pci_dev *child, *tmp;
129 struct pci_host_bridge *host_bridge;
130
131 if (!pci_is_root_bus(bus))
132 return;
133
134 host_bridge = to_pci_host_bridge(bus->bridge);
135 list_for_each_entry_safe_reverse(child, tmp,
136 &bus->devices, bus_list)
137 pci_stop_bus_device(child);
138
139 /* stop the host bridge */
Yinghai Lue3b439e2013-11-30 14:40:27 -0800140 device_release_driver(&host_bridge->dev);
Yinghai Lucdfcc572012-10-30 14:31:38 -0600141}
142
143void pci_remove_root_bus(struct pci_bus *bus)
144{
145 struct pci_dev *child, *tmp;
146 struct pci_host_bridge *host_bridge;
147
148 if (!pci_is_root_bus(bus))
149 return;
150
151 host_bridge = to_pci_host_bridge(bus->bridge);
152 list_for_each_entry_safe(child, tmp,
153 &bus->devices, bus_list)
154 pci_remove_bus_device(child);
155 pci_remove_bus(bus);
156 host_bridge->bus = NULL;
157
158 /* remove the host bridge */
Yinghai Lue3b439e2013-11-30 14:40:27 -0800159 device_unregister(&host_bridge->dev);
Yinghai Lucdfcc572012-10-30 14:31:38 -0600160}