1// SPDX-License-Identifier: GPL-2.0
2#include <linux/pci.h>
3#include <linux/module.h>
4#include "pci.h"
5
6static void pci_free_resources(struct pci_dev *dev)
7{
8	struct resource *res;
9
10	pci_dev_for_each_resource(dev, res) {
11		if (res->parent)
12			release_resource(res);
13	}
14}
15
16static void pci_stop_dev(struct pci_dev *dev)
17{
18	pci_pme_active(dev, false);
19
20	if (pci_dev_is_added(dev)) {
21
22		device_release_driver(&dev->dev);
23		pci_proc_detach_device(dev);
24		pci_remove_sysfs_dev_files(dev);
25		of_pci_remove_node(dev);
26
27		pci_dev_assign_added(dev, false);
28	}
29}
30
31static void pci_destroy_dev(struct pci_dev *dev)
32{
33	if (!dev->dev.kobj.parent)
34		return;
35
36	device_del(&dev->dev);
37
38	down_write(&pci_bus_sem);
39	list_del(&dev->bus_list);
40	up_write(&pci_bus_sem);
41
42	pci_doe_destroy(dev);
43	pcie_aspm_exit_link_state(dev);
44	pci_bridge_d3_update(dev);
45	pci_free_resources(dev);
46	put_device(&dev->dev);
47}
48
49void pci_remove_bus(struct pci_bus *bus)
50{
51	pci_proc_detach_bus(bus);
52
53	down_write(&pci_bus_sem);
54	list_del(&bus->node);
55	pci_bus_release_busn_res(bus);
56	up_write(&pci_bus_sem);
57	pci_remove_legacy_files(bus);
58
59	if (bus->ops->remove_bus)
60		bus->ops->remove_bus(bus);
61
62	pcibios_remove_bus(bus);
63	device_unregister(&bus->dev);
64}
65EXPORT_SYMBOL(pci_remove_bus);
66
67static void pci_stop_bus_device(struct pci_dev *dev)
68{
69	struct pci_bus *bus = dev->subordinate;
70	struct pci_dev *child, *tmp;
71
72	/*
73	 * Stopping an SR-IOV PF device removes all the associated VFs,
74	 * which will update the bus->devices list and confuse the
75	 * iterator.  Therefore, iterate in reverse so we remove the VFs
76	 * first, then the PF.
77	 */
78	if (bus) {
79		list_for_each_entry_safe_reverse(child, tmp,
80						 &bus->devices, bus_list)
81			pci_stop_bus_device(child);
82	}
83
84	pci_stop_dev(dev);
85}
86
87static void pci_remove_bus_device(struct pci_dev *dev)
88{
89	struct pci_bus *bus = dev->subordinate;
90	struct pci_dev *child, *tmp;
91
92	if (bus) {
93		list_for_each_entry_safe(child, tmp,
94					 &bus->devices, bus_list)
95			pci_remove_bus_device(child);
96
97		pci_remove_bus(bus);
98		dev->subordinate = NULL;
99	}
100
101	pci_destroy_dev(dev);
102}
103
104/**
105 * pci_stop_and_remove_bus_device - remove a PCI device and any children
106 * @dev: the device to remove
107 *
108 * Remove a PCI device from the device lists, informing the drivers
109 * that the device has been removed.  We also remove any subordinate
110 * buses and children in a depth-first manner.
111 *
112 * For each device we remove, delete the device structure from the
113 * device lists, remove the /proc entry, and notify userspace
114 * (/sbin/hotplug).
115 */
116void pci_stop_and_remove_bus_device(struct pci_dev *dev)
117{
118	pci_stop_bus_device(dev);
119	pci_remove_bus_device(dev);
120}
121EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
122
123void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
124{
125	pci_lock_rescan_remove();
126	pci_stop_and_remove_bus_device(dev);
127	pci_unlock_rescan_remove();
128}
129EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
130
131void pci_stop_root_bus(struct pci_bus *bus)
132{
133	struct pci_dev *child, *tmp;
134	struct pci_host_bridge *host_bridge;
135
136	if (!pci_is_root_bus(bus))
137		return;
138
139	host_bridge = to_pci_host_bridge(bus->bridge);
140	list_for_each_entry_safe_reverse(child, tmp,
141					 &bus->devices, bus_list)
142		pci_stop_bus_device(child);
143
144	/* stop the host bridge */
145	device_release_driver(&host_bridge->dev);
146}
147EXPORT_SYMBOL_GPL(pci_stop_root_bus);
148
149void pci_remove_root_bus(struct pci_bus *bus)
150{
151	struct pci_dev *child, *tmp;
152	struct pci_host_bridge *host_bridge;
153
154	if (!pci_is_root_bus(bus))
155		return;
156
157	host_bridge = to_pci_host_bridge(bus->bridge);
158	list_for_each_entry_safe(child, tmp,
159				 &bus->devices, bus_list)
160		pci_remove_bus_device(child);
161
162#ifdef CONFIG_PCI_DOMAINS_GENERIC
163	/* Release domain_nr if it was dynamically allocated */
164	if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
165		pci_bus_release_domain_nr(bus, host_bridge->dev.parent);
166#endif
167
168	pci_remove_bus(bus);
169	host_bridge->bus = NULL;
170
171	/* remove the host bridge */
172	device_del(&host_bridge->dev);
173}
174EXPORT_SYMBOL_GPL(pci_remove_root_bus);
175