Commit | Line | Data |
---|---|---|
30edc14b KRW |
1 | /* |
2 | * PCI Backend - Provides restricted access to the real PCI bus topology | |
3 | * to the frontend | |
4 | * | |
5 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> | |
6 | */ | |
7 | ||
8 | #include <linux/list.h> | |
9 | #include <linux/pci.h> | |
10 | #include <linux/spinlock.h> | |
11 | #include "pciback.h" | |
12 | ||
13 | struct passthrough_dev_data { | |
14 | /* Access to dev_list must be protected by lock */ | |
15 | struct list_head dev_list; | |
16 | spinlock_t lock; | |
17 | }; | |
18 | ||
19 | struct pci_dev *pciback_get_pci_dev(struct pciback_device *pdev, | |
20 | unsigned int domain, unsigned int bus, | |
21 | unsigned int devfn) | |
22 | { | |
23 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
24 | struct pci_dev_entry *dev_entry; | |
25 | struct pci_dev *dev = NULL; | |
26 | unsigned long flags; | |
27 | ||
28 | spin_lock_irqsave(&dev_data->lock, flags); | |
29 | ||
30 | list_for_each_entry(dev_entry, &dev_data->dev_list, list) { | |
31 | if (domain == (unsigned int)pci_domain_nr(dev_entry->dev->bus) | |
32 | && bus == (unsigned int)dev_entry->dev->bus->number | |
33 | && devfn == dev_entry->dev->devfn) { | |
34 | dev = dev_entry->dev; | |
35 | break; | |
36 | } | |
37 | } | |
38 | ||
39 | spin_unlock_irqrestore(&dev_data->lock, flags); | |
40 | ||
41 | return dev; | |
42 | } | |
43 | ||
44 | int pciback_add_pci_dev(struct pciback_device *pdev, struct pci_dev *dev, | |
45 | int devid, publish_pci_dev_cb publish_cb) | |
46 | { | |
47 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
48 | struct pci_dev_entry *dev_entry; | |
49 | unsigned long flags; | |
50 | unsigned int domain, bus, devfn; | |
51 | int err; | |
52 | ||
53 | dev_entry = kmalloc(sizeof(*dev_entry), GFP_KERNEL); | |
54 | if (!dev_entry) | |
55 | return -ENOMEM; | |
56 | dev_entry->dev = dev; | |
57 | ||
58 | spin_lock_irqsave(&dev_data->lock, flags); | |
59 | list_add_tail(&dev_entry->list, &dev_data->dev_list); | |
60 | spin_unlock_irqrestore(&dev_data->lock, flags); | |
61 | ||
62 | /* Publish this device. */ | |
63 | domain = (unsigned int)pci_domain_nr(dev->bus); | |
64 | bus = (unsigned int)dev->bus->number; | |
65 | devfn = dev->devfn; | |
66 | err = publish_cb(pdev, domain, bus, devfn, devid); | |
67 | ||
68 | return err; | |
69 | } | |
70 | ||
71 | void pciback_release_pci_dev(struct pciback_device *pdev, struct pci_dev *dev) | |
72 | { | |
73 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
74 | struct pci_dev_entry *dev_entry, *t; | |
75 | struct pci_dev *found_dev = NULL; | |
76 | unsigned long flags; | |
77 | ||
78 | spin_lock_irqsave(&dev_data->lock, flags); | |
79 | ||
80 | list_for_each_entry_safe(dev_entry, t, &dev_data->dev_list, list) { | |
81 | if (dev_entry->dev == dev) { | |
82 | list_del(&dev_entry->list); | |
83 | found_dev = dev_entry->dev; | |
84 | kfree(dev_entry); | |
85 | } | |
86 | } | |
87 | ||
88 | spin_unlock_irqrestore(&dev_data->lock, flags); | |
89 | ||
90 | if (found_dev) | |
91 | pcistub_put_pci_dev(found_dev); | |
92 | } | |
93 | ||
94 | int pciback_init_devices(struct pciback_device *pdev) | |
95 | { | |
96 | struct passthrough_dev_data *dev_data; | |
97 | ||
98 | dev_data = kmalloc(sizeof(*dev_data), GFP_KERNEL); | |
99 | if (!dev_data) | |
100 | return -ENOMEM; | |
101 | ||
102 | spin_lock_init(&dev_data->lock); | |
103 | ||
104 | INIT_LIST_HEAD(&dev_data->dev_list); | |
105 | ||
106 | pdev->pci_dev_data = dev_data; | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | int pciback_publish_pci_roots(struct pciback_device *pdev, | |
112 | publish_pci_root_cb publish_root_cb) | |
113 | { | |
114 | int err = 0; | |
115 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
116 | struct pci_dev_entry *dev_entry, *e; | |
117 | struct pci_dev *dev; | |
118 | int found; | |
119 | unsigned int domain, bus; | |
120 | ||
121 | spin_lock(&dev_data->lock); | |
122 | ||
123 | list_for_each_entry(dev_entry, &dev_data->dev_list, list) { | |
124 | /* Only publish this device as a root if none of its | |
125 | * parent bridges are exported | |
126 | */ | |
127 | found = 0; | |
128 | dev = dev_entry->dev->bus->self; | |
129 | for (; !found && dev != NULL; dev = dev->bus->self) { | |
130 | list_for_each_entry(e, &dev_data->dev_list, list) { | |
131 | if (dev == e->dev) { | |
132 | found = 1; | |
133 | break; | |
134 | } | |
135 | } | |
136 | } | |
137 | ||
138 | domain = (unsigned int)pci_domain_nr(dev_entry->dev->bus); | |
139 | bus = (unsigned int)dev_entry->dev->bus->number; | |
140 | ||
141 | if (!found) { | |
142 | err = publish_root_cb(pdev, domain, bus); | |
143 | if (err) | |
144 | break; | |
145 | } | |
146 | } | |
147 | ||
148 | spin_unlock(&dev_data->lock); | |
149 | ||
150 | return err; | |
151 | } | |
152 | ||
153 | void pciback_release_devices(struct pciback_device *pdev) | |
154 | { | |
155 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
156 | struct pci_dev_entry *dev_entry, *t; | |
157 | ||
158 | list_for_each_entry_safe(dev_entry, t, &dev_data->dev_list, list) { | |
159 | list_del(&dev_entry->list); | |
160 | pcistub_put_pci_dev(dev_entry->dev); | |
161 | kfree(dev_entry); | |
162 | } | |
163 | ||
164 | kfree(dev_data); | |
165 | pdev->pci_dev_data = NULL; | |
166 | } | |
167 | ||
168 | int pciback_get_pcifront_dev(struct pci_dev *pcidev, | |
169 | struct pciback_device *pdev, | |
170 | unsigned int *domain, unsigned int *bus, | |
171 | unsigned int *devfn) | |
172 | ||
173 | { | |
174 | *domain = pci_domain_nr(pcidev->bus); | |
175 | *bus = pcidev->bus->number; | |
176 | *devfn = pcidev->devfn; | |
177 | return 1; | |
178 | } |