Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include <linux/pci.h>
2#include <linux/module.h>
3#include <linux/pci-aspm.h>
4#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
20static void pci_stop_dev(struct pci_dev *dev)
21{
22 if (dev->is_added) {
23 pci_proc_detach_device(dev);
24 pci_remove_sysfs_dev_files(dev);
25 device_unregister(&dev->dev);
26 dev->is_added = 0;
27 }
28
29 if (dev->bus->self)
30 pcie_aspm_exit_link_state(dev);
31}
32
33static void pci_destroy_dev(struct pci_dev *dev)
34{
35 /* Remove the device from the device lists, and prevent any further
36 * list accesses from this device */
37 down_write(&pci_bus_sem);
38 list_del(&dev->bus_list);
39 dev->bus_list.next = dev->bus_list.prev = NULL;
40 up_write(&pci_bus_sem);
41
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 */
55#if 0
56int 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}
63#endif /* 0 */
64
65void pci_remove_bus(struct pci_bus *pci_bus)
66{
67 pci_proc_detach_bus(pci_bus);
68
69 down_write(&pci_bus_sem);
70 list_del(&pci_bus->node);
71 pci_bus_release_busn_res(pci_bus);
72 up_write(&pci_bus_sem);
73 if (!pci_bus->is_added)
74 return;
75
76 pci_remove_legacy_files(pci_bus);
77 device_unregister(&pci_bus->dev);
78}
79EXPORT_SYMBOL(pci_remove_bus);
80
81static void __pci_remove_behind_bridge(struct pci_dev *dev);
82/**
83 * pci_stop_and_remove_bus_device - remove a PCI device and any children
84 * @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 */
94void __pci_remove_bus_device(struct pci_dev *dev)
95{
96 if (dev->subordinate) {
97 struct pci_bus *b = dev->subordinate;
98
99 __pci_remove_behind_bridge(dev);
100 pci_remove_bus(b);
101 dev->subordinate = NULL;
102 }
103
104 pci_destroy_dev(dev);
105}
106EXPORT_SYMBOL(__pci_remove_bus_device);
107
108void pci_stop_and_remove_bus_device(struct pci_dev *dev)
109{
110 pci_stop_bus_device(dev);
111 __pci_remove_bus_device(dev);
112}
113
114static void __pci_remove_behind_bridge(struct pci_dev *dev)
115{
116 struct list_head *l, *n;
117
118 if (dev->subordinate)
119 list_for_each_safe(l, n, &dev->subordinate->devices)
120 __pci_remove_bus_device(pci_dev_b(l));
121}
122
123static void pci_stop_behind_bridge(struct pci_dev *dev)
124{
125 struct list_head *l, *n;
126
127 if (dev->subordinate)
128 list_for_each_safe(l, n, &dev->subordinate->devices)
129 pci_stop_bus_device(pci_dev_b(l));
130}
131
132/**
133 * pci_stop_and_remove_behind_bridge - stop and remove all devices behind
134 * a PCI bridge
135 * @dev: PCI bridge device
136 *
137 * Remove all devices on the bus, except for the parent bridge.
138 * This also removes any child buses, and any devices they may
139 * contain in a depth-first manner.
140 */
141void pci_stop_and_remove_behind_bridge(struct pci_dev *dev)
142{
143 pci_stop_behind_bridge(dev);
144 __pci_remove_behind_bridge(dev);
145}
146
147static void pci_stop_bus_devices(struct pci_bus *bus)
148{
149 struct list_head *l, *n;
150
151 /*
152 * VFs could be removed by pci_stop_and_remove_bus_device() in the
153 * pci_stop_bus_devices() code path for PF.
154 * aka, bus->devices get updated in the process.
155 * but VFs are inserted after PFs when SRIOV is enabled for PF,
156 * We can iterate the list backwards to get prev valid PF instead
157 * of removed VF.
158 */
159 list_for_each_prev_safe(l, n, &bus->devices) {
160 struct pci_dev *dev = pci_dev_b(l);
161 pci_stop_bus_device(dev);
162 }
163}
164
165/**
166 * pci_stop_bus_device - stop a PCI device and any children
167 * @dev: the device to stop
168 *
169 * Stop a PCI device (detach the driver, remove from the global list
170 * and so on). This also stop any subordinate buses and children in a
171 * depth-first manner.
172 */
173void pci_stop_bus_device(struct pci_dev *dev)
174{
175 if (dev->subordinate)
176 pci_stop_bus_devices(dev->subordinate);
177
178 pci_stop_dev(dev);
179}
180
181EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
182EXPORT_SYMBOL(pci_stop_and_remove_behind_bridge);
183EXPORT_SYMBOL_GPL(pci_stop_bus_device);