summaryrefslogtreecommitdiff
path: root/drivers/pci/hotplug.c
blob: d471b3ea5d12fb812f4782e7100fe5d22fe79f3d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/module.h>
#include "pci.h"

int pci_hotplug (struct device *dev, char **envp, int num_envp,
		 char *buffer, int buffer_size)
{
	struct pci_dev *pdev;
	char *scratch;
	int i = 0;
	int length = 0;

	if (!dev)
		return -ENODEV;

	pdev = to_pci_dev(dev);
	if (!pdev)
		return -ENODEV;

	scratch = buffer;

	/* stuff we want to pass to /sbin/hotplug */
	envp[i++] = scratch;
	length += scnprintf (scratch, buffer_size - length, "PCI_CLASS=%04X",
			    pdev->class);
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;
	++length;
	scratch += length;

	envp[i++] = scratch;
	length += scnprintf (scratch, buffer_size - length, "PCI_ID=%04X:%04X",
			    pdev->vendor, pdev->device);
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;
	++length;
	scratch += length;

	envp[i++] = scratch;
	length += scnprintf (scratch, buffer_size - length,
			    "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
			    pdev->subsystem_device);
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;
	++length;
	scratch += length;

	envp[i++] = scratch;
	length += scnprintf (scratch, buffer_size - length, "PCI_SLOT_NAME=%s",
			    pci_name(pdev));
	if ((buffer_size - length <= 0) || (i >= num_envp))
		return -ENOMEM;

	envp[i] = NULL;

	return 0;
}

static int pci_visit_bus (struct pci_visit * fn, struct pci_bus_wrapped *wrapped_bus, struct pci_dev_wrapped *wrapped_parent)
{
	struct list_head *ln;
	struct pci_dev *dev;
	struct pci_dev_wrapped wrapped_dev;
	int result = 0;

	pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(wrapped_bus->bus),
		wrapped_bus->bus->number);

	if (fn->pre_visit_pci_bus) {
		result = fn->pre_visit_pci_bus(wrapped_bus, wrapped_parent);
		if (result)
			return result;
	}

	ln = wrapped_bus->bus->devices.next; 
	while (ln != &wrapped_bus->bus->devices) {
		dev = pci_dev_b(ln);
		ln = ln->next;

		memset(&wrapped_dev, 0, sizeof(struct pci_dev_wrapped));
		wrapped_dev.dev = dev;

		result = pci_visit_dev(fn, &wrapped_dev, wrapped_bus);
		if (result)
			return result;
	}

	if (fn->post_visit_pci_bus)
		result = fn->post_visit_pci_bus(wrapped_bus, wrapped_parent);

	return result;
}

static int pci_visit_bridge (struct pci_visit * fn,
			     struct pci_dev_wrapped *wrapped_dev,
			     struct pci_bus_wrapped *wrapped_parent)
{
	struct pci_bus *bus;
	struct pci_bus_wrapped wrapped_bus;
	int result = 0;

	pr_debug("PCI: Scanning bridge %s\n", pci_name(wrapped_dev->dev));

	if (fn->visit_pci_dev) {
		result = fn->visit_pci_dev(wrapped_dev, wrapped_parent);
		if (result)
			return result;
	}

	bus = wrapped_dev->dev->subordinate;
	if (bus) {
		memset(&wrapped_bus, 0, sizeof(struct pci_bus_wrapped));
		wrapped_bus.bus = bus;

		result = pci_visit_bus(fn, &wrapped_bus, wrapped_dev);
	}
	return result;
}

/**
 * pci_visit_dev - scans the pci buses.
 * Every bus and every function is presented to a custom
 * function that can act upon it.
 */
int pci_visit_dev(struct pci_visit *fn, struct pci_dev_wrapped *wrapped_dev,
		  struct pci_bus_wrapped *wrapped_parent)
{
	struct pci_dev* dev = wrapped_dev ? wrapped_dev->dev : NULL;
	int result = 0;

	if (!dev)
		return 0;

	if (fn->pre_visit_pci_dev) {
		result = fn->pre_visit_pci_dev(wrapped_dev, wrapped_parent);
		if (result)
			return result;
	}

	switch (dev->class >> 8) {
		case PCI_CLASS_BRIDGE_PCI:
			result = pci_visit_bridge(fn, wrapped_dev,
						  wrapped_parent);
			if (result)
				return result;
			break;
		default:
			pr_debug("PCI: Scanning device %s\n", pci_name(dev));
			if (fn->visit_pci_dev) {
				result = fn->visit_pci_dev (wrapped_dev,
							    wrapped_parent);
				if (result)
					return result;
			}
	}

	if (fn->post_visit_pci_dev)
		result = fn->post_visit_pci_dev(wrapped_dev, wrapped_parent);

	return result;
}
EXPORT_SYMBOL(pci_visit_dev);