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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
Satoru Takeuchi24f8aa92006-09-12 10:16:36 -07006static void pci_stop_dev(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007{
Rafael J. Wysocki249bfb82013-02-11 20:49:49 +01008 pci_pme_active(dev, false);
9
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -080010 if (dev->is_added) {
Rajesh Shah091ca9f2005-04-28 00:25:49 -070011 pci_proc_detach_device(dev);
12 pci_remove_sysfs_dev_files(dev);
Rafael J. Wysockic4a0a5d2013-12-18 13:53:32 -070013 device_release_driver(&dev->dev);
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -080014 dev->is_added = 0;
Rajesh Shah091ca9f2005-04-28 00:25:49 -070015 }
Shaohua Li7d715a62008-02-25 09:46:41 +080016
17 if (dev->bus->self)
18 pcie_aspm_exit_link_state(dev);
Satoru Takeuchi24f8aa92006-09-12 10:16:36 -070019}
20
21static void pci_destroy_dev(struct pci_dev *dev)
22{
Rafael J. Wysocki8a4c5c32014-01-14 12:04:51 -070023 if (!dev->dev.kobj.parent)
24 return;
25
Rafael J. Wysockic4a0a5d2013-12-18 13:53:32 -070026 device_del(&dev->dev);
27
Jiang Liue723f0b2013-01-21 13:20:46 -080028 put_device(&dev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070029}
30
Bjorn Helgaasd563e2c2012-08-16 20:43:11 -060031void pci_remove_bus(struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -070032{
Bjorn Helgaasd563e2c2012-08-16 20:43:11 -060033 pci_proc_detach_bus(bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Zhang Yanmind71374d2006-06-02 12:35:43 +080035 down_write(&pci_bus_sem);
Bjorn Helgaasd563e2c2012-08-16 20:43:11 -060036 list_del(&bus->node);
37 pci_bus_release_busn_res(bus);
Zhang Yanmind71374d2006-06-02 12:35:43 +080038 up_write(&pci_bus_sem);
Bjorn Helgaasd563e2c2012-08-16 20:43:11 -060039 pci_remove_legacy_files(bus);
Jiang Liu10a95742013-04-12 05:44:20 +000040 pcibios_remove_bus(bus);
Bjorn Helgaasd563e2c2012-08-16 20:43:11 -060041 device_unregister(&bus->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042}
43EXPORT_SYMBOL(pci_remove_bus);
44
Yinghai Lu3891b6a2012-09-19 11:54:20 -070045static void pci_stop_bus_device(struct pci_dev *dev)
46{
47 struct pci_bus *bus = dev->subordinate;
48 struct pci_dev *child, *tmp;
49
50 /*
51 * Stopping an SR-IOV PF device removes all the associated VFs,
52 * which will update the bus->devices list and confuse the
53 * iterator. Therefore, iterate in reverse so we remove the VFs
54 * first, then the PF.
55 */
56 if (bus) {
57 list_for_each_entry_safe_reverse(child, tmp,
58 &bus->devices, bus_list)
59 pci_stop_bus_device(child);
60 }
61
62 pci_stop_dev(dev);
63}
64
65static void pci_remove_bus_device(struct pci_dev *dev)
66{
67 struct pci_bus *bus = dev->subordinate;
68 struct pci_dev *child, *tmp;
69
70 if (bus) {
71 list_for_each_entry_safe(child, tmp,
72 &bus->devices, bus_list)
73 pci_remove_bus_device(child);
74
75 pci_remove_bus(bus);
76 dev->subordinate = NULL;
77 }
78
79 pci_destroy_dev(dev);
80}
81
Linus Torvalds1da177e2005-04-16 15:20:36 -070082/**
Yinghai Lu210647a2012-02-25 13:54:20 -080083 * pci_stop_and_remove_bus_device - remove a PCI device and any children
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 * @dev: the device to remove
85 *
86 * Remove a PCI device from the device lists, informing the drivers
87 * that the device has been removed. We also remove any subordinate
88 * buses and children in a depth-first manner.
89 *
90 * For each device we remove, delete the device structure from the
91 * device lists, remove the /proc entry, and notify userspace
92 * (/sbin/hotplug).
93 */
Yinghai Lu210647a2012-02-25 13:54:20 -080094void pci_stop_and_remove_bus_device(struct pci_dev *dev)
Yinghai Lu79cc9602011-11-22 21:06:53 -080095{
Yinghai Lu3891b6a2012-09-19 11:54:20 -070096 pci_stop_bus_device(dev);
97 pci_remove_bus_device(dev);
Satoru Takeuchi24f8aa92006-09-12 10:16:36 -070098}
Yinghai Lu210647a2012-02-25 13:54:20 -080099EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
Yinghai Lucdfcc572012-10-30 14:31:38 -0600100
Rafael J. Wysocki9d169472014-01-10 15:22:18 +0100101void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
102{
103 pci_lock_rescan_remove();
104 pci_stop_and_remove_bus_device(dev);
105 pci_unlock_rescan_remove();
106}
107EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
108
Yinghai Lucdfcc572012-10-30 14:31:38 -0600109void pci_stop_root_bus(struct pci_bus *bus)
110{
111 struct pci_dev *child, *tmp;
112 struct pci_host_bridge *host_bridge;
113
114 if (!pci_is_root_bus(bus))
115 return;
116
117 host_bridge = to_pci_host_bridge(bus->bridge);
118 list_for_each_entry_safe_reverse(child, tmp,
119 &bus->devices, bus_list)
120 pci_stop_bus_device(child);
121
122 /* stop the host bridge */
Yinghai Lue3b439e2013-11-30 14:40:27 -0800123 device_release_driver(&host_bridge->dev);
Yinghai Lucdfcc572012-10-30 14:31:38 -0600124}
125
126void pci_remove_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(child, tmp,
136 &bus->devices, bus_list)
137 pci_remove_bus_device(child);
138 pci_remove_bus(bus);
139 host_bridge->bus = NULL;
140
141 /* remove the host bridge */
Yinghai Lue3b439e2013-11-30 14:40:27 -0800142 device_unregister(&host_bridge->dev);
Yinghai Lucdfcc572012-10-30 14:31:38 -0600143}