2 * PCI Backend - Provides restricted access to the real PCI bus topology
5 * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
8 #include <linux/list.h>
10 #include <linux/spinlock.h>
13 struct passthrough_dev_data {
14 /* Access to dev_list must be protected by lock */
15 struct list_head dev_list;
19 struct pci_dev *pciback_get_pci_dev(struct pciback_device *pdev,
20 unsigned int domain, unsigned int bus,
23 struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
24 struct pci_dev_entry *dev_entry;
25 struct pci_dev *dev = NULL;
28 spin_lock_irqsave(&dev_data->lock, flags);
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) {
39 spin_unlock_irqrestore(&dev_data->lock, flags);
44 int pciback_add_pci_dev(struct pciback_device *pdev, struct pci_dev *dev,
45 int devid, publish_pci_dev_cb publish_cb)
47 struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
48 struct pci_dev_entry *dev_entry;
50 unsigned int domain, bus, devfn;
53 dev_entry = kmalloc(sizeof(*dev_entry), GFP_KERNEL);
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);
62 /* Publish this device. */
63 domain = (unsigned int)pci_domain_nr(dev->bus);
64 bus = (unsigned int)dev->bus->number;
66 err = publish_cb(pdev, domain, bus, devfn, devid);
71 void pciback_release_pci_dev(struct pciback_device *pdev, struct pci_dev *dev)
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;
78 spin_lock_irqsave(&dev_data->lock, flags);
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;
88 spin_unlock_irqrestore(&dev_data->lock, flags);
91 pcistub_put_pci_dev(found_dev);
94 int pciback_init_devices(struct pciback_device *pdev)
96 struct passthrough_dev_data *dev_data;
98 dev_data = kmalloc(sizeof(*dev_data), GFP_KERNEL);
102 spin_lock_init(&dev_data->lock);
104 INIT_LIST_HEAD(&dev_data->dev_list);
106 pdev->pci_dev_data = dev_data;
111 int pciback_publish_pci_roots(struct pciback_device *pdev,
112 publish_pci_root_cb publish_root_cb)
115 struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
116 struct pci_dev_entry *dev_entry, *e;
119 unsigned int domain, bus;
121 spin_lock(&dev_data->lock);
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
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) {
138 domain = (unsigned int)pci_domain_nr(dev_entry->dev->bus);
139 bus = (unsigned int)dev_entry->dev->bus->number;
142 err = publish_root_cb(pdev, domain, bus);
148 spin_unlock(&dev_data->lock);
153 void pciback_release_devices(struct pciback_device *pdev)
155 struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
156 struct pci_dev_entry *dev_entry, *t;
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);
165 pdev->pci_dev_data = NULL;
168 int pciback_get_pcifront_dev(struct pci_dev *pcidev,
169 struct pciback_device *pdev,
170 unsigned int *domain, unsigned int *bus,
174 *domain = pci_domain_nr(pcidev->bus);
175 *bus = pcidev->bus->number;
176 *devfn = pcidev->devfn;