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 | ||
2ebdc426 KRW |
19 | static struct pci_dev *__xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, |
20 | unsigned int domain, | |
21 | unsigned int bus, | |
22 | unsigned int devfn) | |
30edc14b KRW |
23 | { |
24 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
25 | struct pci_dev_entry *dev_entry; | |
26 | struct pci_dev *dev = NULL; | |
27 | unsigned long flags; | |
28 | ||
29 | spin_lock_irqsave(&dev_data->lock, flags); | |
30 | ||
31 | list_for_each_entry(dev_entry, &dev_data->dev_list, list) { | |
32 | if (domain == (unsigned int)pci_domain_nr(dev_entry->dev->bus) | |
33 | && bus == (unsigned int)dev_entry->dev->bus->number | |
34 | && devfn == dev_entry->dev->devfn) { | |
35 | dev = dev_entry->dev; | |
36 | break; | |
37 | } | |
38 | } | |
39 | ||
40 | spin_unlock_irqrestore(&dev_data->lock, flags); | |
41 | ||
42 | return dev; | |
43 | } | |
44 | ||
2ebdc426 KRW |
45 | static int __xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev, |
46 | struct pci_dev *dev, | |
47 | int devid, publish_pci_dev_cb publish_cb) | |
30edc14b KRW |
48 | { |
49 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
50 | struct pci_dev_entry *dev_entry; | |
51 | unsigned long flags; | |
52 | unsigned int domain, bus, devfn; | |
53 | int err; | |
54 | ||
55 | dev_entry = kmalloc(sizeof(*dev_entry), GFP_KERNEL); | |
56 | if (!dev_entry) | |
57 | return -ENOMEM; | |
58 | dev_entry->dev = dev; | |
59 | ||
60 | spin_lock_irqsave(&dev_data->lock, flags); | |
61 | list_add_tail(&dev_entry->list, &dev_data->dev_list); | |
62 | spin_unlock_irqrestore(&dev_data->lock, flags); | |
63 | ||
64 | /* Publish this device. */ | |
65 | domain = (unsigned int)pci_domain_nr(dev->bus); | |
66 | bus = (unsigned int)dev->bus->number; | |
67 | devfn = dev->devfn; | |
68 | err = publish_cb(pdev, domain, bus, devfn, devid); | |
69 | ||
70 | return err; | |
71 | } | |
72 | ||
2ebdc426 KRW |
73 | static void __xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev, |
74 | struct pci_dev *dev) | |
30edc14b KRW |
75 | { |
76 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
77 | struct pci_dev_entry *dev_entry, *t; | |
78 | struct pci_dev *found_dev = NULL; | |
79 | unsigned long flags; | |
80 | ||
81 | spin_lock_irqsave(&dev_data->lock, flags); | |
82 | ||
83 | list_for_each_entry_safe(dev_entry, t, &dev_data->dev_list, list) { | |
84 | if (dev_entry->dev == dev) { | |
85 | list_del(&dev_entry->list); | |
86 | found_dev = dev_entry->dev; | |
87 | kfree(dev_entry); | |
88 | } | |
89 | } | |
90 | ||
91 | spin_unlock_irqrestore(&dev_data->lock, flags); | |
92 | ||
93 | if (found_dev) | |
94 | pcistub_put_pci_dev(found_dev); | |
95 | } | |
96 | ||
2ebdc426 | 97 | static int __xen_pcibk_init_devices(struct xen_pcibk_device *pdev) |
30edc14b KRW |
98 | { |
99 | struct passthrough_dev_data *dev_data; | |
100 | ||
101 | dev_data = kmalloc(sizeof(*dev_data), GFP_KERNEL); | |
102 | if (!dev_data) | |
103 | return -ENOMEM; | |
104 | ||
105 | spin_lock_init(&dev_data->lock); | |
106 | ||
107 | INIT_LIST_HEAD(&dev_data->dev_list); | |
108 | ||
109 | pdev->pci_dev_data = dev_data; | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
2ebdc426 KRW |
114 | static int __xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev, |
115 | publish_pci_root_cb publish_root_cb) | |
30edc14b KRW |
116 | { |
117 | int err = 0; | |
118 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
494ef20d | 119 | struct pci_dev_entry *dev_entry, *e, *tmp; |
30edc14b KRW |
120 | struct pci_dev *dev; |
121 | int found; | |
122 | unsigned int domain, bus; | |
123 | ||
124 | spin_lock(&dev_data->lock); | |
125 | ||
494ef20d | 126 | list_for_each_entry_safe(dev_entry, tmp, &dev_data->dev_list, list) { |
30edc14b KRW |
127 | /* Only publish this device as a root if none of its |
128 | * parent bridges are exported | |
129 | */ | |
130 | found = 0; | |
131 | dev = dev_entry->dev->bus->self; | |
132 | for (; !found && dev != NULL; dev = dev->bus->self) { | |
133 | list_for_each_entry(e, &dev_data->dev_list, list) { | |
134 | if (dev == e->dev) { | |
135 | found = 1; | |
136 | break; | |
137 | } | |
138 | } | |
139 | } | |
140 | ||
141 | domain = (unsigned int)pci_domain_nr(dev_entry->dev->bus); | |
142 | bus = (unsigned int)dev_entry->dev->bus->number; | |
143 | ||
144 | if (!found) { | |
494ef20d | 145 | spin_unlock(&dev_data->lock); |
30edc14b KRW |
146 | err = publish_root_cb(pdev, domain, bus); |
147 | if (err) | |
148 | break; | |
494ef20d | 149 | spin_lock(&dev_data->lock); |
30edc14b KRW |
150 | } |
151 | } | |
152 | ||
494ef20d KRW |
153 | if (!err) |
154 | spin_unlock(&dev_data->lock); | |
30edc14b KRW |
155 | |
156 | return err; | |
157 | } | |
158 | ||
2ebdc426 | 159 | static void __xen_pcibk_release_devices(struct xen_pcibk_device *pdev) |
30edc14b KRW |
160 | { |
161 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
162 | struct pci_dev_entry *dev_entry, *t; | |
163 | ||
164 | list_for_each_entry_safe(dev_entry, t, &dev_data->dev_list, list) { | |
165 | list_del(&dev_entry->list); | |
166 | pcistub_put_pci_dev(dev_entry->dev); | |
167 | kfree(dev_entry); | |
168 | } | |
169 | ||
170 | kfree(dev_data); | |
171 | pdev->pci_dev_data = NULL; | |
172 | } | |
173 | ||
2ebdc426 KRW |
174 | static int __xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev, |
175 | struct xen_pcibk_device *pdev, | |
176 | unsigned int *domain, unsigned int *bus, | |
177 | unsigned int *devfn) | |
30edc14b KRW |
178 | { |
179 | *domain = pci_domain_nr(pcidev->bus); | |
180 | *bus = pcidev->bus->number; | |
181 | *devfn = pcidev->devfn; | |
182 | return 1; | |
183 | } | |
2ebdc426 KRW |
184 | |
185 | struct xen_pcibk_backend xen_pcibk_passthrough_backend = { | |
186 | .name = "passthrough", | |
187 | .init = __xen_pcibk_init_devices, | |
188 | .free = __xen_pcibk_release_devices, | |
189 | .find = __xen_pcibk_get_pcifront_dev, | |
190 | .publish = __xen_pcibk_publish_pci_roots, | |
191 | .release = __xen_pcibk_release_pci_dev, | |
192 | .add = __xen_pcibk_add_pci_dev, | |
193 | .get = __xen_pcibk_get_pci_dev, | |
194 | }; |