xref: /linux/drivers/pci/remove.c (revision 0cb71708c5816569f8addd5c6f33cb9679e73b5b)
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/pci.h>
3 #include <linux/module.h>
4 #include <linux/of.h>
5 #include <linux/of_platform.h>
6 #include <linux/platform_device.h>
7 
8 #include "pci.h"
9 
pci_free_resources(struct pci_dev * dev)10 static void pci_free_resources(struct pci_dev *dev)
11 {
12 	struct resource *res;
13 
14 	pci_dev_for_each_resource(dev, res) {
15 		if (res->parent)
16 			release_resource(res);
17 	}
18 }
19 
pci_pwrctrl_unregister(struct device * dev)20 static void pci_pwrctrl_unregister(struct device *dev)
21 {
22 	struct device_node *np;
23 	struct platform_device *pdev;
24 
25 	np = dev_of_node(dev);
26 	if (!np)
27 		return;
28 
29 	pdev = of_find_device_by_node(np);
30 	if (!pdev)
31 		return;
32 
33 	of_device_unregister(pdev);
34 	of_node_clear_flag(np, OF_POPULATED);
35 }
36 
pci_stop_dev(struct pci_dev * dev)37 static void pci_stop_dev(struct pci_dev *dev)
38 {
39 	pci_pme_active(dev, false);
40 
41 	if (!pci_dev_test_and_clear_added(dev))
42 		return;
43 
44 	pci_pwrctrl_unregister(&dev->dev);
45 	device_release_driver(&dev->dev);
46 	pci_proc_detach_device(dev);
47 	pci_remove_sysfs_dev_files(dev);
48 	of_pci_remove_node(dev);
49 }
50 
pci_destroy_dev(struct pci_dev * dev)51 static void pci_destroy_dev(struct pci_dev *dev)
52 {
53 	if (pci_dev_test_and_set_removed(dev))
54 		return;
55 
56 	pci_npem_remove(dev);
57 
58 	device_del(&dev->dev);
59 
60 	down_write(&pci_bus_sem);
61 	list_del(&dev->bus_list);
62 	up_write(&pci_bus_sem);
63 
64 	pci_doe_destroy(dev);
65 	pcie_aspm_exit_link_state(dev);
66 	pci_bridge_d3_update(dev);
67 	pci_free_resources(dev);
68 	put_device(&dev->dev);
69 }
70 
pci_remove_bus(struct pci_bus * bus)71 void pci_remove_bus(struct pci_bus *bus)
72 {
73 	pci_proc_detach_bus(bus);
74 
75 	down_write(&pci_bus_sem);
76 	list_del(&bus->node);
77 	pci_bus_release_busn_res(bus);
78 	up_write(&pci_bus_sem);
79 	pci_remove_legacy_files(bus);
80 
81 	if (bus->ops->remove_bus)
82 		bus->ops->remove_bus(bus);
83 
84 	pcibios_remove_bus(bus);
85 	device_unregister(&bus->dev);
86 }
87 EXPORT_SYMBOL(pci_remove_bus);
88 
pci_stop_bus_device(struct pci_dev * dev)89 static void pci_stop_bus_device(struct pci_dev *dev)
90 {
91 	struct pci_bus *bus = dev->subordinate;
92 	struct pci_dev *child, *tmp;
93 
94 	/*
95 	 * Stopping an SR-IOV PF device removes all the associated VFs,
96 	 * which will update the bus->devices list and confuse the
97 	 * iterator.  Therefore, iterate in reverse so we remove the VFs
98 	 * first, then the PF.
99 	 */
100 	if (bus) {
101 		list_for_each_entry_safe_reverse(child, tmp,
102 						 &bus->devices, bus_list)
103 			pci_stop_bus_device(child);
104 	}
105 
106 	pci_stop_dev(dev);
107 }
108 
pci_remove_bus_device(struct pci_dev * dev)109 static void pci_remove_bus_device(struct pci_dev *dev)
110 {
111 	struct pci_bus *bus = dev->subordinate;
112 	struct pci_dev *child, *tmp;
113 
114 	if (bus) {
115 		list_for_each_entry_safe(child, tmp,
116 					 &bus->devices, bus_list)
117 			pci_remove_bus_device(child);
118 
119 		pci_remove_bus(bus);
120 		dev->subordinate = NULL;
121 	}
122 
123 	pci_destroy_dev(dev);
124 }
125 
126 /**
127  * pci_stop_and_remove_bus_device - remove a PCI device and any children
128  * @dev: the device to remove
129  *
130  * Remove a PCI device from the device lists, informing the drivers
131  * that the device has been removed.  We also remove any subordinate
132  * buses and children in a depth-first manner.
133  *
134  * For each device we remove, delete the device structure from the
135  * device lists, remove the /proc entry, and notify userspace
136  * (/sbin/hotplug).
137  */
pci_stop_and_remove_bus_device(struct pci_dev * dev)138 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
139 {
140 	pci_stop_bus_device(dev);
141 	pci_remove_bus_device(dev);
142 }
143 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
144 
pci_stop_and_remove_bus_device_locked(struct pci_dev * dev)145 void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
146 {
147 	pci_lock_rescan_remove();
148 	pci_stop_and_remove_bus_device(dev);
149 	pci_unlock_rescan_remove();
150 }
151 EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
152 
pci_stop_root_bus(struct pci_bus * bus)153 void pci_stop_root_bus(struct pci_bus *bus)
154 {
155 	struct pci_dev *child, *tmp;
156 	struct pci_host_bridge *host_bridge;
157 
158 	if (!pci_is_root_bus(bus))
159 		return;
160 
161 	host_bridge = to_pci_host_bridge(bus->bridge);
162 	list_for_each_entry_safe_reverse(child, tmp,
163 					 &bus->devices, bus_list)
164 		pci_stop_bus_device(child);
165 
166 	/* stop the host bridge */
167 	device_release_driver(&host_bridge->dev);
168 }
169 EXPORT_SYMBOL_GPL(pci_stop_root_bus);
170 
pci_remove_root_bus(struct pci_bus * bus)171 void pci_remove_root_bus(struct pci_bus *bus)
172 {
173 	struct pci_dev *child, *tmp;
174 	struct pci_host_bridge *host_bridge;
175 
176 	if (!pci_is_root_bus(bus))
177 		return;
178 
179 	host_bridge = to_pci_host_bridge(bus->bridge);
180 	list_for_each_entry_safe(child, tmp,
181 				 &bus->devices, bus_list)
182 		pci_remove_bus_device(child);
183 
184 #ifdef CONFIG_PCI_DOMAINS_GENERIC
185 	/* Release domain_nr if it was dynamically allocated */
186 	if (host_bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
187 		pci_bus_release_domain_nr(host_bridge->dev.parent, bus->domain_nr);
188 #endif
189 
190 	pci_remove_bus(bus);
191 	host_bridge->bus = NULL;
192 
193 	/* remove the host bridge */
194 	device_del(&host_bridge->dev);
195 }
196 EXPORT_SYMBOL_GPL(pci_remove_root_bus);
197