xref: /openbmc/linux/drivers/pci/remove.c (revision 643d1f7f)
1 #include <linux/pci.h>
2 #include <linux/module.h>
3 #include <linux/aspm.h>
4 #include "pci.h"
5 
6 static 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 
20 static void pci_stop_dev(struct pci_dev *dev)
21 {
22 	if (!dev->global_list.next)
23 		return;
24 
25 	if (!list_empty(&dev->global_list)) {
26 		pci_proc_detach_device(dev);
27 		pci_remove_sysfs_dev_files(dev);
28 		device_unregister(&dev->dev);
29 		down_write(&pci_bus_sem);
30 		list_del(&dev->global_list);
31 		dev->global_list.next = dev->global_list.prev = NULL;
32 		up_write(&pci_bus_sem);
33 	}
34 
35 	if (dev->bus->self)
36 		pcie_aspm_exit_link_state(dev);
37 }
38 
39 static void pci_destroy_dev(struct pci_dev *dev)
40 {
41 	pci_stop_dev(dev);
42 
43 	/* Remove the device from the device lists, and prevent any further
44 	 * list accesses from this device */
45 	down_write(&pci_bus_sem);
46 	list_del(&dev->bus_list);
47 	dev->bus_list.next = dev->bus_list.prev = NULL;
48 	up_write(&pci_bus_sem);
49 
50 	pci_free_resources(dev);
51 	pci_dev_put(dev);
52 }
53 
54 /**
55  * pci_remove_device_safe - remove an unused hotplug device
56  * @dev: the device to remove
57  *
58  * Delete the device structure from the device lists and
59  * notify userspace (/sbin/hotplug), but only if the device
60  * in question is not being used by a driver.
61  * Returns 0 on success.
62  */
63 #if 0
64 int pci_remove_device_safe(struct pci_dev *dev)
65 {
66 	if (pci_dev_driver(dev))
67 		return -EBUSY;
68 	pci_destroy_dev(dev);
69 	return 0;
70 }
71 #endif  /*  0  */
72 
73 void pci_remove_bus(struct pci_bus *pci_bus)
74 {
75 	pci_proc_detach_bus(pci_bus);
76 
77 	down_write(&pci_bus_sem);
78 	list_del(&pci_bus->node);
79 	up_write(&pci_bus_sem);
80 	pci_remove_legacy_files(pci_bus);
81 	device_remove_file(&pci_bus->dev, &dev_attr_cpuaffinity);
82 	device_unregister(&pci_bus->dev);
83 }
84 EXPORT_SYMBOL(pci_remove_bus);
85 
86 /**
87  * pci_remove_bus_device - remove a PCI device and any children
88  * @dev: the device to remove
89  *
90  * Remove a PCI device from the device lists, informing the drivers
91  * that the device has been removed.  We also remove any subordinate
92  * buses and children in a depth-first manner.
93  *
94  * For each device we remove, delete the device structure from the
95  * device lists, remove the /proc entry, and notify userspace
96  * (/sbin/hotplug).
97  */
98 void pci_remove_bus_device(struct pci_dev *dev)
99 {
100 	if (dev->subordinate) {
101 		struct pci_bus *b = dev->subordinate;
102 
103 		pci_remove_behind_bridge(dev);
104 		pci_remove_bus(b);
105 		dev->subordinate = NULL;
106 	}
107 
108 	pci_destroy_dev(dev);
109 }
110 
111 /**
112  * pci_remove_behind_bridge - remove all devices behind a PCI bridge
113  * @dev: PCI bridge device
114  *
115  * Remove all devices on the bus, except for the parent bridge.
116  * This also removes any child buses, and any devices they may
117  * contain in a depth-first manner.
118  */
119 void pci_remove_behind_bridge(struct pci_dev *dev)
120 {
121 	struct list_head *l, *n;
122 
123 	if (dev->subordinate) {
124 		list_for_each_safe(l, n, &dev->subordinate->devices) {
125 			struct pci_dev *dev = pci_dev_b(l);
126 
127 			pci_remove_bus_device(dev);
128 		}
129 	}
130 }
131 
132 static void pci_stop_bus_devices(struct pci_bus *bus)
133 {
134 	struct list_head *l, *n;
135 
136 	list_for_each_safe(l, n, &bus->devices) {
137 		struct pci_dev *dev = pci_dev_b(l);
138 		pci_stop_bus_device(dev);
139 	}
140 }
141 
142 /**
143  * pci_stop_bus_device - stop a PCI device and any children
144  * @dev: the device to stop
145  *
146  * Stop a PCI device (detach the driver, remove from the global list
147  * and so on). This also stop any subordinate buses and children in a
148  * depth-first manner.
149  */
150 void pci_stop_bus_device(struct pci_dev *dev)
151 {
152 	if (dev->subordinate)
153 		pci_stop_bus_devices(dev->subordinate);
154 
155 	pci_stop_dev(dev);
156 }
157 
158 EXPORT_SYMBOL(pci_remove_bus_device);
159 EXPORT_SYMBOL(pci_remove_behind_bridge);
160 EXPORT_SYMBOL_GPL(pci_stop_bus_device);
161