Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 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 | |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame^] | 8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 9 | |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 10 | #include <linux/list.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/pci.h> |
Konrad Rzeszutek Wilk | 74d33de | 2011-09-21 17:04:47 -0400 | [diff] [blame] | 13 | #include <linux/mutex.h> |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 14 | #include "pciback.h" |
| 15 | |
| 16 | #define PCI_SLOT_MAX 32 |
| 17 | |
| 18 | struct vpci_dev_data { |
| 19 | /* Access to dev_list must be protected by lock */ |
| 20 | struct list_head dev_list[PCI_SLOT_MAX]; |
Konrad Rzeszutek Wilk | 74d33de | 2011-09-21 17:04:47 -0400 | [diff] [blame] | 21 | struct mutex lock; |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 22 | }; |
| 23 | |
| 24 | static inline struct list_head *list_first(struct list_head *head) |
| 25 | { |
| 26 | return head->next; |
| 27 | } |
| 28 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame] | 29 | static struct pci_dev *__xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev, |
| 30 | unsigned int domain, |
| 31 | unsigned int bus, |
| 32 | unsigned int devfn) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 33 | { |
| 34 | struct pci_dev_entry *entry; |
| 35 | struct pci_dev *dev = NULL; |
| 36 | struct vpci_dev_data *vpci_dev = pdev->pci_dev_data; |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 37 | |
| 38 | if (domain != 0 || bus != 0) |
| 39 | return NULL; |
| 40 | |
| 41 | if (PCI_SLOT(devfn) < PCI_SLOT_MAX) { |
Konrad Rzeszutek Wilk | 74d33de | 2011-09-21 17:04:47 -0400 | [diff] [blame] | 42 | mutex_lock(&vpci_dev->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 43 | |
| 44 | list_for_each_entry(entry, |
| 45 | &vpci_dev->dev_list[PCI_SLOT(devfn)], |
| 46 | list) { |
| 47 | if (PCI_FUNC(entry->dev->devfn) == PCI_FUNC(devfn)) { |
| 48 | dev = entry->dev; |
| 49 | break; |
| 50 | } |
| 51 | } |
| 52 | |
Konrad Rzeszutek Wilk | 74d33de | 2011-09-21 17:04:47 -0400 | [diff] [blame] | 53 | mutex_unlock(&vpci_dev->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 54 | } |
| 55 | return dev; |
| 56 | } |
| 57 | |
| 58 | static inline int match_slot(struct pci_dev *l, struct pci_dev *r) |
| 59 | { |
| 60 | if (pci_domain_nr(l->bus) == pci_domain_nr(r->bus) |
| 61 | && l->bus == r->bus && PCI_SLOT(l->devfn) == PCI_SLOT(r->devfn)) |
| 62 | return 1; |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame] | 67 | static int __xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev, |
| 68 | struct pci_dev *dev, int devid, |
| 69 | publish_pci_dev_cb publish_cb) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 70 | { |
| 71 | int err = 0, slot, func = -1; |
| 72 | struct pci_dev_entry *t, *dev_entry; |
| 73 | struct vpci_dev_data *vpci_dev = pdev->pci_dev_data; |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 74 | |
| 75 | if ((dev->class >> 24) == PCI_BASE_CLASS_BRIDGE) { |
| 76 | err = -EFAULT; |
| 77 | xenbus_dev_fatal(pdev->xdev, err, |
| 78 | "Can't export bridges on the virtual PCI bus"); |
| 79 | goto out; |
| 80 | } |
| 81 | |
| 82 | dev_entry = kmalloc(sizeof(*dev_entry), GFP_KERNEL); |
| 83 | if (!dev_entry) { |
| 84 | err = -ENOMEM; |
| 85 | xenbus_dev_fatal(pdev->xdev, err, |
| 86 | "Error adding entry to virtual PCI bus"); |
| 87 | goto out; |
| 88 | } |
| 89 | |
| 90 | dev_entry->dev = dev; |
| 91 | |
Konrad Rzeszutek Wilk | 74d33de | 2011-09-21 17:04:47 -0400 | [diff] [blame] | 92 | mutex_lock(&vpci_dev->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 93 | |
Laszlo Ersek | 8a5248f | 2012-10-17 11:55:55 +0200 | [diff] [blame] | 94 | /* |
| 95 | * Keep multi-function devices together on the virtual PCI bus, except |
| 96 | * virtual functions. |
| 97 | */ |
| 98 | if (!dev->is_virtfn) { |
| 99 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) { |
| 100 | if (list_empty(&vpci_dev->dev_list[slot])) |
| 101 | continue; |
| 102 | |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 103 | t = list_entry(list_first(&vpci_dev->dev_list[slot]), |
| 104 | struct pci_dev_entry, list); |
| 105 | |
| 106 | if (match_slot(dev, t->dev)) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame^] | 107 | pr_info("vpci: %s: assign to virtual slot %d func %d\n", |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 108 | pci_name(dev), slot, |
| 109 | PCI_FUNC(dev->devfn)); |
| 110 | list_add_tail(&dev_entry->list, |
| 111 | &vpci_dev->dev_list[slot]); |
| 112 | func = PCI_FUNC(dev->devfn); |
| 113 | goto unlock; |
| 114 | } |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | /* Assign to a new slot on the virtual PCI bus */ |
| 119 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) { |
| 120 | if (list_empty(&vpci_dev->dev_list[slot])) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame^] | 121 | pr_info("vpci: %s: assign to virtual slot %d\n", |
| 122 | pci_name(dev), slot); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 123 | list_add_tail(&dev_entry->list, |
| 124 | &vpci_dev->dev_list[slot]); |
Laszlo Ersek | 8a5248f | 2012-10-17 11:55:55 +0200 | [diff] [blame] | 125 | func = dev->is_virtfn ? 0 : PCI_FUNC(dev->devfn); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 126 | goto unlock; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | err = -ENOMEM; |
| 131 | xenbus_dev_fatal(pdev->xdev, err, |
| 132 | "No more space on root virtual PCI bus"); |
| 133 | |
| 134 | unlock: |
Konrad Rzeszutek Wilk | 74d33de | 2011-09-21 17:04:47 -0400 | [diff] [blame] | 135 | mutex_unlock(&vpci_dev->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 136 | |
| 137 | /* Publish this device. */ |
| 138 | if (!err) |
| 139 | err = publish_cb(pdev, 0, 0, PCI_DEVFN(slot, func), devid); |
| 140 | |
| 141 | out: |
| 142 | return err; |
| 143 | } |
| 144 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame] | 145 | static void __xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev, |
| 146 | struct pci_dev *dev) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 147 | { |
| 148 | int slot; |
| 149 | struct vpci_dev_data *vpci_dev = pdev->pci_dev_data; |
| 150 | struct pci_dev *found_dev = NULL; |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 151 | |
Konrad Rzeszutek Wilk | 74d33de | 2011-09-21 17:04:47 -0400 | [diff] [blame] | 152 | mutex_lock(&vpci_dev->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 153 | |
| 154 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) { |
Jan Beulich | 402c5e1 | 2011-09-21 16:22:11 -0400 | [diff] [blame] | 155 | struct pci_dev_entry *e; |
| 156 | |
| 157 | list_for_each_entry(e, &vpci_dev->dev_list[slot], list) { |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 158 | if (e->dev == dev) { |
| 159 | list_del(&e->list); |
| 160 | found_dev = e->dev; |
| 161 | kfree(e); |
| 162 | goto out; |
| 163 | } |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | out: |
Konrad Rzeszutek Wilk | 74d33de | 2011-09-21 17:04:47 -0400 | [diff] [blame] | 168 | mutex_unlock(&vpci_dev->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 169 | |
| 170 | if (found_dev) |
| 171 | pcistub_put_pci_dev(found_dev); |
| 172 | } |
| 173 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame] | 174 | static int __xen_pcibk_init_devices(struct xen_pcibk_device *pdev) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 175 | { |
| 176 | int slot; |
| 177 | struct vpci_dev_data *vpci_dev; |
| 178 | |
| 179 | vpci_dev = kmalloc(sizeof(*vpci_dev), GFP_KERNEL); |
| 180 | if (!vpci_dev) |
| 181 | return -ENOMEM; |
| 182 | |
Konrad Rzeszutek Wilk | 74d33de | 2011-09-21 17:04:47 -0400 | [diff] [blame] | 183 | mutex_init(&vpci_dev->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 184 | |
| 185 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) |
| 186 | INIT_LIST_HEAD(&vpci_dev->dev_list[slot]); |
| 187 | |
| 188 | pdev->pci_dev_data = vpci_dev; |
| 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame] | 193 | static int __xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev, |
| 194 | publish_pci_root_cb publish_cb) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 195 | { |
| 196 | /* The Virtual PCI bus has only one root */ |
| 197 | return publish_cb(pdev, 0, 0); |
| 198 | } |
| 199 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame] | 200 | static void __xen_pcibk_release_devices(struct xen_pcibk_device *pdev) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 201 | { |
| 202 | int slot; |
| 203 | struct vpci_dev_data *vpci_dev = pdev->pci_dev_data; |
| 204 | |
| 205 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) { |
| 206 | struct pci_dev_entry *e, *tmp; |
| 207 | list_for_each_entry_safe(e, tmp, &vpci_dev->dev_list[slot], |
| 208 | list) { |
| 209 | list_del(&e->list); |
| 210 | pcistub_put_pci_dev(e->dev); |
| 211 | kfree(e); |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | kfree(vpci_dev); |
| 216 | pdev->pci_dev_data = NULL; |
| 217 | } |
| 218 | |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame] | 219 | static int __xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev, |
| 220 | struct xen_pcibk_device *pdev, |
| 221 | unsigned int *domain, unsigned int *bus, |
| 222 | unsigned int *devfn) |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 223 | { |
| 224 | struct pci_dev_entry *entry; |
| 225 | struct pci_dev *dev = NULL; |
| 226 | struct vpci_dev_data *vpci_dev = pdev->pci_dev_data; |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 227 | int found = 0, slot; |
| 228 | |
Konrad Rzeszutek Wilk | 74d33de | 2011-09-21 17:04:47 -0400 | [diff] [blame] | 229 | mutex_lock(&vpci_dev->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 230 | for (slot = 0; slot < PCI_SLOT_MAX; slot++) { |
| 231 | list_for_each_entry(entry, |
| 232 | &vpci_dev->dev_list[slot], |
| 233 | list) { |
| 234 | dev = entry->dev; |
| 235 | if (dev && dev->bus->number == pcidev->bus->number |
| 236 | && pci_domain_nr(dev->bus) == |
| 237 | pci_domain_nr(pcidev->bus) |
| 238 | && dev->devfn == pcidev->devfn) { |
| 239 | found = 1; |
| 240 | *domain = 0; |
| 241 | *bus = 0; |
| 242 | *devfn = PCI_DEVFN(slot, |
| 243 | PCI_FUNC(pcidev->devfn)); |
| 244 | } |
| 245 | } |
| 246 | } |
Dan Carpenter | e1db4ce | 2011-09-27 10:07:21 +0300 | [diff] [blame] | 247 | mutex_unlock(&vpci_dev->lock); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 248 | return found; |
| 249 | } |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame] | 250 | |
Jan Beulich | 402c5e1 | 2011-09-21 16:22:11 -0400 | [diff] [blame] | 251 | const struct xen_pcibk_backend xen_pcibk_vpci_backend = { |
Konrad Rzeszutek Wilk | 2ebdc42 | 2011-07-11 16:49:41 -0400 | [diff] [blame] | 252 | .name = "vpci", |
| 253 | .init = __xen_pcibk_init_devices, |
| 254 | .free = __xen_pcibk_release_devices, |
| 255 | .find = __xen_pcibk_get_pcifront_dev, |
| 256 | .publish = __xen_pcibk_publish_pci_roots, |
| 257 | .release = __xen_pcibk_release_pci_dev, |
| 258 | .add = __xen_pcibk_add_pci_dev, |
| 259 | .get = __xen_pcibk_get_pci_dev, |
| 260 | }; |