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> | |
04df3552 | 10 | #include <linux/mutex.h> |
30edc14b KRW |
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; | |
04df3552 | 16 | struct mutex lock; |
30edc14b KRW |
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; | |
30edc14b | 27 | |
04df3552 | 28 | mutex_lock(&dev_data->lock); |
30edc14b KRW |
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 | ||
04df3552 | 39 | mutex_unlock(&dev_data->lock); |
30edc14b KRW |
40 | |
41 | return dev; | |
42 | } | |
43 | ||
2ebdc426 KRW |
44 | static int __xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev, |
45 | struct pci_dev *dev, | |
46 | int devid, publish_pci_dev_cb publish_cb) | |
30edc14b KRW |
47 | { |
48 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
49 | struct pci_dev_entry *dev_entry; | |
30edc14b KRW |
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 | ||
04df3552 | 58 | mutex_lock(&dev_data->lock); |
30edc14b | 59 | list_add_tail(&dev_entry->list, &dev_data->dev_list); |
04df3552 | 60 | mutex_unlock(&dev_data->lock); |
30edc14b KRW |
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 | ||
2ebdc426 | 71 | static void __xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev, |
e8801a74 | 72 | struct pci_dev *dev, bool lock) |
30edc14b KRW |
73 | { |
74 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
75 | struct pci_dev_entry *dev_entry, *t; | |
76 | struct pci_dev *found_dev = NULL; | |
30edc14b | 77 | |
04df3552 | 78 | mutex_lock(&dev_data->lock); |
30edc14b KRW |
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 | ||
04df3552 | 88 | mutex_unlock(&dev_data->lock); |
30edc14b | 89 | |
e8801a74 KRW |
90 | if (found_dev) { |
91 | if (lock) | |
92 | device_lock(&found_dev->dev); | |
30edc14b | 93 | pcistub_put_pci_dev(found_dev); |
e8801a74 KRW |
94 | if (lock) |
95 | device_unlock(&found_dev->dev); | |
96 | } | |
30edc14b KRW |
97 | } |
98 | ||
2ebdc426 | 99 | static int __xen_pcibk_init_devices(struct xen_pcibk_device *pdev) |
30edc14b KRW |
100 | { |
101 | struct passthrough_dev_data *dev_data; | |
102 | ||
103 | dev_data = kmalloc(sizeof(*dev_data), GFP_KERNEL); | |
104 | if (!dev_data) | |
105 | return -ENOMEM; | |
106 | ||
04df3552 | 107 | mutex_init(&dev_data->lock); |
30edc14b KRW |
108 | |
109 | INIT_LIST_HEAD(&dev_data->dev_list); | |
110 | ||
111 | pdev->pci_dev_data = dev_data; | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
2ebdc426 KRW |
116 | static int __xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev, |
117 | publish_pci_root_cb publish_root_cb) | |
30edc14b KRW |
118 | { |
119 | int err = 0; | |
120 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
04df3552 | 121 | struct pci_dev_entry *dev_entry, *e; |
30edc14b KRW |
122 | struct pci_dev *dev; |
123 | int found; | |
124 | unsigned int domain, bus; | |
125 | ||
04df3552 | 126 | mutex_lock(&dev_data->lock); |
30edc14b | 127 | |
04df3552 | 128 | list_for_each_entry(dev_entry, &dev_data->dev_list, list) { |
30edc14b KRW |
129 | /* Only publish this device as a root if none of its |
130 | * parent bridges are exported | |
131 | */ | |
132 | found = 0; | |
133 | dev = dev_entry->dev->bus->self; | |
134 | for (; !found && dev != NULL; dev = dev->bus->self) { | |
135 | list_for_each_entry(e, &dev_data->dev_list, list) { | |
136 | if (dev == e->dev) { | |
137 | found = 1; | |
138 | break; | |
139 | } | |
140 | } | |
141 | } | |
142 | ||
143 | domain = (unsigned int)pci_domain_nr(dev_entry->dev->bus); | |
144 | bus = (unsigned int)dev_entry->dev->bus->number; | |
145 | ||
146 | if (!found) { | |
147 | err = publish_root_cb(pdev, domain, bus); | |
148 | if (err) | |
149 | break; | |
150 | } | |
151 | } | |
152 | ||
04df3552 | 153 | mutex_unlock(&dev_data->lock); |
30edc14b KRW |
154 | |
155 | return err; | |
156 | } | |
157 | ||
2ebdc426 | 158 | static void __xen_pcibk_release_devices(struct xen_pcibk_device *pdev) |
30edc14b KRW |
159 | { |
160 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; | |
161 | struct pci_dev_entry *dev_entry, *t; | |
162 | ||
163 | list_for_each_entry_safe(dev_entry, t, &dev_data->dev_list, list) { | |
e8801a74 | 164 | struct pci_dev *dev = dev_entry->dev; |
30edc14b | 165 | list_del(&dev_entry->list); |
e8801a74 KRW |
166 | device_lock(&dev->dev); |
167 | pcistub_put_pci_dev(dev); | |
168 | device_unlock(&dev->dev); | |
30edc14b KRW |
169 | kfree(dev_entry); |
170 | } | |
171 | ||
172 | kfree(dev_data); | |
173 | pdev->pci_dev_data = NULL; | |
174 | } | |
175 | ||
2ebdc426 KRW |
176 | static int __xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev, |
177 | struct xen_pcibk_device *pdev, | |
178 | unsigned int *domain, unsigned int *bus, | |
179 | unsigned int *devfn) | |
30edc14b KRW |
180 | { |
181 | *domain = pci_domain_nr(pcidev->bus); | |
182 | *bus = pcidev->bus->number; | |
183 | *devfn = pcidev->devfn; | |
184 | return 1; | |
185 | } | |
2ebdc426 | 186 | |
402c5e15 | 187 | const struct xen_pcibk_backend xen_pcibk_passthrough_backend = { |
2ebdc426 KRW |
188 | .name = "passthrough", |
189 | .init = __xen_pcibk_init_devices, | |
190 | .free = __xen_pcibk_release_devices, | |
191 | .find = __xen_pcibk_get_pcifront_dev, | |
192 | .publish = __xen_pcibk_publish_pci_roots, | |
193 | .release = __xen_pcibk_release_pci_dev, | |
194 | .add = __xen_pcibk_add_pci_dev, | |
195 | .get = __xen_pcibk_get_pci_dev, | |
196 | }; |