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 pci_pme_active(dev, false);
23
24 if (dev->is_added) {
25 pci_proc_detach_device(dev);
26 pci_remove_sysfs_dev_files(dev);
27 device_del(&dev->dev);
28 dev->is_added = 0;
29 }
30
31 if (dev->bus->self)
32 pcie_aspm_exit_link_state(dev);
33}
34
35static void pci_destroy_dev(struct pci_dev *dev)
36{
37 down_write(&pci_bus_sem);
38 list_del(&dev->bus_list);
39 up_write(&pci_bus_sem);
40
41 pci_free_resources(dev);
42 put_device(&dev->dev);
43}
44
45void pci_remove_bus(struct pci_bus *bus)
46{
47 pci_proc_detach_bus(bus);
48
49 down_write(&pci_bus_sem);
50 list_del(&bus->node);
51 pci_bus_release_busn_res(bus);
52 up_write(&pci_bus_sem);
53 if (!bus->is_added)
54 return;
55
56 pci_remove_legacy_files(bus);
57 device_unregister(&bus->dev);
58}
59EXPORT_SYMBOL(pci_remove_bus);
60
61static void pci_stop_bus_device(struct pci_dev *dev)
62{
63 struct pci_bus *bus = dev->subordinate;
64 struct pci_dev *child, *tmp;
65
66 /*
67 * Stopping an SR-IOV PF device removes all the associated VFs,
68 * which will update the bus->devices list and confuse the
69 * iterator. Therefore, iterate in reverse so we remove the VFs
70 * first, then the PF.
71 */
72 if (bus) {
73 list_for_each_entry_safe_reverse(child, tmp,
74 &bus->devices, bus_list)
75 pci_stop_bus_device(child);
76 }
77
78 pci_stop_dev(dev);
79}
80
81static void pci_remove_bus_device(struct pci_dev *dev)
82{
83 struct pci_bus *bus = dev->subordinate;
84 struct pci_dev *child, *tmp;
85
86 if (bus) {
87 list_for_each_entry_safe(child, tmp,
88 &bus->devices, bus_list)
89 pci_remove_bus_device(child);
90
91 pci_remove_bus(bus);
92 dev->subordinate = NULL;
93 }
94
95 pci_destroy_dev(dev);
96}
97
98/**
99 * pci_stop_and_remove_bus_device - remove a PCI device and any children
100 * @dev: the device to remove
101 *
102 * Remove a PCI device from the device lists, informing the drivers
103 * that the device has been removed. We also remove any subordinate
104 * buses and children in a depth-first manner.
105 *
106 * For each device we remove, delete the device structure from the
107 * device lists, remove the /proc entry, and notify userspace
108 * (/sbin/hotplug).
109 */
110void pci_stop_and_remove_bus_device(struct pci_dev *dev)
111{
112 pci_stop_bus_device(dev);
113 pci_remove_bus_device(dev);
114}
115EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
116
117void pci_stop_root_bus(struct pci_bus *bus)
118{
119 struct pci_dev *child, *tmp;
120 struct pci_host_bridge *host_bridge;
121
122 if (!pci_is_root_bus(bus))
123 return;
124
125 host_bridge = to_pci_host_bridge(bus->bridge);
126 list_for_each_entry_safe_reverse(child, tmp,
127 &bus->devices, bus_list)
128 pci_stop_bus_device(child);
129
130 /* stop the host bridge */
131 device_del(&host_bridge->dev);
132}
133
134void pci_remove_root_bus(struct pci_bus *bus)
135{
136 struct pci_dev *child, *tmp;
137 struct pci_host_bridge *host_bridge;
138
139 if (!pci_is_root_bus(bus))
140 return;
141
142 host_bridge = to_pci_host_bridge(bus->bridge);
143 list_for_each_entry_safe(child, tmp,
144 &bus->devices, bus_list)
145 pci_remove_bus_device(child);
146 pci_remove_bus(bus);
147 host_bridge->bus = NULL;
148
149 /* remove the host bridge */
150 put_device(&host_bridge->dev);
151}