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Commit | Line | Data |
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30edc14b KRW |
1 | /* |
2 | * PCI Backend - Provides a Virtual PCI bus (with real devices) | |
3 | * to the frontend | |
4 | * | |
5 | * Author: Ryan Wilson <hap9@epoch.ncsc.mil> | |
6 | */ | |
7 | ||
8 | #include <linux/list.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/pci.h> | |
74d33ded | 11 | #include <linux/mutex.h> |
30edc14b KRW |
12 | #include "pciback.h" |
13 | ||
14 | #define PCI_SLOT_MAX 32 | |
15 | ||
16 | struct vpci_dev_data { | |
17 | /* Access to dev_list must be protected by lock */ | |
18 | struct list_head dev_list[PCI_SLOT_MAX]; | |
74d33ded | 19 | struct mutex lock; |
30edc14b KRW |
20 | }; |
21 | ||
22 | static inline struct list_head *list_first(struct list_head *head) | |
23 | { | |
24 | return head->next; | |
25 | } | |
26 | ||
2ebdc426 KRW |
27 | static struct pci_dev *__xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, |
28 | unsigned int domain, | |
29 | unsigned int bus, | |
30 | unsigned int devfn) | |
30edc14b KRW |
31 | { |
32 | struct pci_dev_entry *entry; | |
33 | struct pci_dev *dev = NULL; | |
34 | struct vpci_dev_data *vpci_dev = pdev->pci_dev_data; | |
30edc14b KRW |
35 | |
36 | if (domain != 0 || bus != 0) | |
37 | return NULL; | |
38 | ||
39 | if (PCI_SLOT(devfn) < PCI_SLOT_MAX) { | |
74d33ded | 40 | mutex_lock(&vpci_dev->lock); |
30edc14b KRW |
41 | |
42 | list_for_each_entry(entry, | |
43 | &vpci_dev->dev_list[PCI_SLOT(devfn)], | |
44 | list) { | |
45 | if (PCI_FUNC(entry->dev->devfn) == PCI_FUNC(devfn)) { | |
46 | dev = entry->dev; | |
47 | break; | |
48 | } | |
49 | } | |
50 | ||
74d33ded | 51 | mutex_unlock(&vpci_dev->lock); |
30edc14b KRW |
52 | } |
53 | return dev; | |
54 | } | |
55 | ||
56 | static inline int match_slot(struct pci_dev *l, struct pci_dev *r) | |
57 | { | |
58 | if (pci_domain_nr(l->bus) == pci_domain_nr(r->bus) | |
59 | && l->bus == r->bus && PCI_SLOT(l->devfn) == PCI_SLOT(r->devfn)) | |
60 | return 1; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
2ebdc426 KRW |
65 | static int __xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev, |
66 | struct pci_dev *dev, int devid, | |
67 | publish_pci_dev_cb publish_cb) | |
30edc14b KRW |
68 | { |
69 | int err = 0, slot, func = -1; | |
70 | struct pci_dev_entry *t, *dev_entry; | |
71 | struct vpci_dev_data *vpci_dev = pdev->pci_dev_data; | |
30edc14b KRW |
72 | |
73 | if ((dev->class >> 24) == PCI_BASE_CLASS_BRIDGE) { | |
74 | err = -EFAULT; | |
75 | xenbus_dev_fatal(pdev->xdev, err, | |
76 | "Can't export bridges on the virtual PCI bus"); | |
77 | goto out; | |
78 | } | |
79 | ||
80 | dev_entry = kmalloc(sizeof(*dev_entry), GFP_KERNEL); | |
81 | if (!dev_entry) { | |
82 | err = -ENOMEM; | |
83 | xenbus_dev_fatal(pdev->xdev, err, | |
84 | "Error adding entry to virtual PCI bus"); | |
85 | goto out; | |
86 | } | |
87 | ||
88 | dev_entry->dev = dev; | |
89 | ||
74d33ded | 90 | mutex_lock(&vpci_dev->lock); |
30edc14b KRW |
91 | |
92 | /* Keep multi-function devices together on the virtual PCI bus */ | |
93 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) { | |
94 | if (!list_empty(&vpci_dev->dev_list[slot])) { | |
95 | t = list_entry(list_first(&vpci_dev->dev_list[slot]), | |
96 | struct pci_dev_entry, list); | |
97 | ||
98 | if (match_slot(dev, t->dev)) { | |
a92336a1 | 99 | pr_info(DRV_NAME ": vpci: %s: " |
30edc14b KRW |
100 | "assign to virtual slot %d func %d\n", |
101 | pci_name(dev), slot, | |
102 | PCI_FUNC(dev->devfn)); | |
103 | list_add_tail(&dev_entry->list, | |
104 | &vpci_dev->dev_list[slot]); | |
105 | func = PCI_FUNC(dev->devfn); | |
106 | goto unlock; | |
107 | } | |
108 | } | |
109 | } | |
110 | ||
111 | /* Assign to a new slot on the virtual PCI bus */ | |
112 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) { | |
113 | if (list_empty(&vpci_dev->dev_list[slot])) { | |
a92336a1 KRW |
114 | printk(KERN_INFO DRV_NAME |
115 | ": vpci: %s: assign to virtual slot %d\n", | |
30edc14b KRW |
116 | pci_name(dev), slot); |
117 | list_add_tail(&dev_entry->list, | |
118 | &vpci_dev->dev_list[slot]); | |
119 | func = PCI_FUNC(dev->devfn); | |
120 | goto unlock; | |
121 | } | |
122 | } | |
123 | ||
124 | err = -ENOMEM; | |
125 | xenbus_dev_fatal(pdev->xdev, err, | |
126 | "No more space on root virtual PCI bus"); | |
127 | ||
128 | unlock: | |
74d33ded | 129 | mutex_unlock(&vpci_dev->lock); |
30edc14b KRW |
130 | |
131 | /* Publish this device. */ | |
132 | if (!err) | |
133 | err = publish_cb(pdev, 0, 0, PCI_DEVFN(slot, func), devid); | |
134 | ||
135 | out: | |
136 | return err; | |
137 | } | |
138 | ||
2ebdc426 KRW |
139 | static void __xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev, |
140 | struct pci_dev *dev) | |
30edc14b KRW |
141 | { |
142 | int slot; | |
143 | struct vpci_dev_data *vpci_dev = pdev->pci_dev_data; | |
144 | struct pci_dev *found_dev = NULL; | |
30edc14b | 145 | |
74d33ded | 146 | mutex_lock(&vpci_dev->lock); |
30edc14b KRW |
147 | |
148 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) { | |
402c5e15 JB |
149 | struct pci_dev_entry *e; |
150 | ||
151 | list_for_each_entry(e, &vpci_dev->dev_list[slot], list) { | |
30edc14b KRW |
152 | if (e->dev == dev) { |
153 | list_del(&e->list); | |
154 | found_dev = e->dev; | |
155 | kfree(e); | |
156 | goto out; | |
157 | } | |
158 | } | |
159 | } | |
160 | ||
161 | out: | |
74d33ded | 162 | mutex_unlock(&vpci_dev->lock); |
30edc14b KRW |
163 | |
164 | if (found_dev) | |
165 | pcistub_put_pci_dev(found_dev); | |
166 | } | |
167 | ||
2ebdc426 | 168 | static int __xen_pcibk_init_devices(struct xen_pcibk_device *pdev) |
30edc14b KRW |
169 | { |
170 | int slot; | |
171 | struct vpci_dev_data *vpci_dev; | |
172 | ||
173 | vpci_dev = kmalloc(sizeof(*vpci_dev), GFP_KERNEL); | |
174 | if (!vpci_dev) | |
175 | return -ENOMEM; | |
176 | ||
74d33ded | 177 | mutex_init(&vpci_dev->lock); |
30edc14b KRW |
178 | |
179 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) | |
180 | INIT_LIST_HEAD(&vpci_dev->dev_list[slot]); | |
181 | ||
182 | pdev->pci_dev_data = vpci_dev; | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
2ebdc426 KRW |
187 | static int __xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev, |
188 | publish_pci_root_cb publish_cb) | |
30edc14b KRW |
189 | { |
190 | /* The Virtual PCI bus has only one root */ | |
191 | return publish_cb(pdev, 0, 0); | |
192 | } | |
193 | ||
2ebdc426 | 194 | static void __xen_pcibk_release_devices(struct xen_pcibk_device *pdev) |
30edc14b KRW |
195 | { |
196 | int slot; | |
197 | struct vpci_dev_data *vpci_dev = pdev->pci_dev_data; | |
198 | ||
199 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) { | |
200 | struct pci_dev_entry *e, *tmp; | |
201 | list_for_each_entry_safe(e, tmp, &vpci_dev->dev_list[slot], | |
202 | list) { | |
203 | list_del(&e->list); | |
204 | pcistub_put_pci_dev(e->dev); | |
205 | kfree(e); | |
206 | } | |
207 | } | |
208 | ||
209 | kfree(vpci_dev); | |
210 | pdev->pci_dev_data = NULL; | |
211 | } | |
212 | ||
2ebdc426 KRW |
213 | static int __xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev, |
214 | struct xen_pcibk_device *pdev, | |
215 | unsigned int *domain, unsigned int *bus, | |
216 | unsigned int *devfn) | |
30edc14b KRW |
217 | { |
218 | struct pci_dev_entry *entry; | |
219 | struct pci_dev *dev = NULL; | |
220 | struct vpci_dev_data *vpci_dev = pdev->pci_dev_data; | |
30edc14b KRW |
221 | int found = 0, slot; |
222 | ||
74d33ded | 223 | mutex_lock(&vpci_dev->lock); |
30edc14b KRW |
224 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) { |
225 | list_for_each_entry(entry, | |
226 | &vpci_dev->dev_list[slot], | |
227 | list) { | |
228 | dev = entry->dev; | |
229 | if (dev && dev->bus->number == pcidev->bus->number | |
230 | && pci_domain_nr(dev->bus) == | |
231 | pci_domain_nr(pcidev->bus) | |
232 | && dev->devfn == pcidev->devfn) { | |
233 | found = 1; | |
234 | *domain = 0; | |
235 | *bus = 0; | |
236 | *devfn = PCI_DEVFN(slot, | |
237 | PCI_FUNC(pcidev->devfn)); | |
238 | } | |
239 | } | |
240 | } | |
e1db4cef | 241 | mutex_unlock(&vpci_dev->lock); |
30edc14b KRW |
242 | return found; |
243 | } | |
2ebdc426 | 244 | |
402c5e15 | 245 | const struct xen_pcibk_backend xen_pcibk_vpci_backend = { |
2ebdc426 KRW |
246 | .name = "vpci", |
247 | .init = __xen_pcibk_init_devices, | |
248 | .free = __xen_pcibk_release_devices, | |
249 | .find = __xen_pcibk_get_pcifront_dev, | |
250 | .publish = __xen_pcibk_publish_pci_roots, | |
251 | .release = __xen_pcibk_release_pci_dev, | |
252 | .add = __xen_pcibk_add_pci_dev, | |
253 | .get = __xen_pcibk_get_pci_dev, | |
254 | }; |