passthrough.c (494ef20db6ea2e2ab1c3a45a1461e6e717fdcf48) passthrough.c (a92336a1176b2119eaa990a1e8bf3109665fdbc6)
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
13struct 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
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
13struct 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
19struct pci_dev *pciback_get_pci_dev(struct pciback_device *pdev,
20 unsigned int domain, unsigned int bus,
21 unsigned int devfn)
19struct pci_dev *xen_pcibk_get_pci_dev(struct xen_pcibk_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

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36 }
37 }
38
39 spin_unlock_irqrestore(&dev_data->lock, flags);
40
41 return dev;
42}
43
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

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36 }
37 }
38
39 spin_unlock_irqrestore(&dev_data->lock, flags);
40
41 return dev;
42}
43
44int pciback_add_pci_dev(struct pciback_device *pdev, struct pci_dev *dev,
45 int devid, publish_pci_dev_cb publish_cb)
44int xen_pcibk_add_pci_dev(struct xen_pcibk_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);

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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
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);

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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
71void pciback_release_pci_dev(struct pciback_device *pdev, struct pci_dev *dev)
71void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
72 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

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86 }
87
88 spin_unlock_irqrestore(&dev_data->lock, flags);
89
90 if (found_dev)
91 pcistub_put_pci_dev(found_dev);
92}
93
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;
77 unsigned long flags;
78
79 spin_lock_irqsave(&dev_data->lock, flags);
80

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87 }
88
89 spin_unlock_irqrestore(&dev_data->lock, flags);
90
91 if (found_dev)
92 pcistub_put_pci_dev(found_dev);
93}
94
94int pciback_init_devices(struct pciback_device *pdev)
95int xen_pcibk_init_devices(struct xen_pcibk_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
96{
97 struct passthrough_dev_data *dev_data;
98
99 dev_data = kmalloc(sizeof(*dev_data), GFP_KERNEL);
100 if (!dev_data)
101 return -ENOMEM;
102
103 spin_lock_init(&dev_data->lock);
104
105 INIT_LIST_HEAD(&dev_data->dev_list);
106
107 pdev->pci_dev_data = dev_data;
108
109 return 0;
110}
111
111int pciback_publish_pci_roots(struct pciback_device *pdev,
112 publish_pci_root_cb publish_root_cb)
112int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
113 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, *tmp;
117 struct pci_dev *dev;
118 int found;
119 unsigned int domain, bus;
120

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148 }
149
150 if (!err)
151 spin_unlock(&dev_data->lock);
152
153 return err;
154}
155
114{
115 int err = 0;
116 struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
117 struct pci_dev_entry *dev_entry, *e, *tmp;
118 struct pci_dev *dev;
119 int found;
120 unsigned int domain, bus;
121

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149 }
150
151 if (!err)
152 spin_unlock(&dev_data->lock);
153
154 return err;
155}
156
156void pciback_release_devices(struct pciback_device *pdev)
157void xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
157{
158 struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
159 struct pci_dev_entry *dev_entry, *t;
160
161 list_for_each_entry_safe(dev_entry, t, &dev_data->dev_list, list) {
162 list_del(&dev_entry->list);
163 pcistub_put_pci_dev(dev_entry->dev);
164 kfree(dev_entry);
165 }
166
167 kfree(dev_data);
168 pdev->pci_dev_data = NULL;
169}
170
158{
159 struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
160 struct pci_dev_entry *dev_entry, *t;
161
162 list_for_each_entry_safe(dev_entry, t, &dev_data->dev_list, list) {
163 list_del(&dev_entry->list);
164 pcistub_put_pci_dev(dev_entry->dev);
165 kfree(dev_entry);
166 }
167
168 kfree(dev_data);
169 pdev->pci_dev_data = NULL;
170}
171
171int pciback_get_pcifront_dev(struct pci_dev *pcidev,
172 struct pciback_device *pdev,
173 unsigned int *domain, unsigned int *bus,
174 unsigned int *devfn)
175
172int xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
173 struct xen_pcibk_device *pdev,
174 unsigned int *domain, unsigned int *bus,
175 unsigned int *devfn)
176{
177 *domain = pci_domain_nr(pcidev->bus);
178 *bus = pcidev->bus->number;
179 *devfn = pcidev->devfn;
180 return 1;
181}
176{
177 *domain = pci_domain_nr(pcidev->bus);
178 *bus = pcidev->bus->number;
179 *devfn = pcidev->devfn;
180 return 1;
181}