Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 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 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame^] | 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) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 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 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame^] | 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) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 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 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame^] | 73 | static void __xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev, |
| 74 | struct pci_dev *dev) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 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 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame^] | 97 | static int __xen_pcibk_init_devices(struct xen_pcibk_device *pdev) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 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 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame^] | 114 | static int __xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev, |
| 115 | publish_pci_root_cb publish_root_cb) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 116 | { |
| 117 | int err = 0; |
| 118 | struct passthrough_dev_data *dev_data = pdev->pci_dev_data; |
Konrad Rzeszutek Wilk | 494ef20 | 2010-07-23 14:35:47 -0400 | [diff] [blame] | 119 | struct pci_dev_entry *dev_entry, *e, *tmp; |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 120 | struct pci_dev *dev; |
| 121 | int found; |
| 122 | unsigned int domain, bus; |
| 123 | |
| 124 | spin_lock(&dev_data->lock); |
| 125 | |
Konrad Rzeszutek Wilk | 494ef20 | 2010-07-23 14:35:47 -0400 | [diff] [blame] | 126 | list_for_each_entry_safe(dev_entry, tmp, &dev_data->dev_list, list) { |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 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) { |
Konrad Rzeszutek Wilk | 494ef20 | 2010-07-23 14:35:47 -0400 | [diff] [blame] | 145 | spin_unlock(&dev_data->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 146 | err = publish_root_cb(pdev, domain, bus); |
| 147 | if (err) |
| 148 | break; |
Konrad Rzeszutek Wilk | 494ef20 | 2010-07-23 14:35:47 -0400 | [diff] [blame] | 149 | spin_lock(&dev_data->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 150 | } |
| 151 | } |
| 152 | |
Konrad Rzeszutek Wilk | 494ef20 | 2010-07-23 14:35:47 -0400 | [diff] [blame] | 153 | if (!err) |
| 154 | spin_unlock(&dev_data->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 155 | |
| 156 | return err; |
| 157 | } |
| 158 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame^] | 159 | static void __xen_pcibk_release_devices(struct xen_pcibk_device *pdev) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 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 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame^] | 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) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 178 | { |
| 179 | *domain = pci_domain_nr(pcidev->bus); |
| 180 | *bus = pcidev->bus->number; |
| 181 | *devfn = pcidev->devfn; |
| 182 | return 1; |
| 183 | } |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame^] | 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 | }; |