| 1 | /* |
| 2 | * drivers/pci/iov.c |
| 3 | * |
| 4 | * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com> |
| 5 | * |
| 6 | * PCI Express I/O Virtualization (IOV) support. |
| 7 | * Single Root IOV 1.0 |
| 8 | * Address Translation Service 1.0 |
| 9 | */ |
| 10 | |
| 11 | #include <linux/pci.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/mutex.h> |
| 14 | #include <linux/export.h> |
| 15 | #include <linux/string.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/pci-ats.h> |
| 18 | #include "pci.h" |
| 19 | |
| 20 | #define VIRTFN_ID_LEN 16 |
| 21 | |
| 22 | int pci_iov_virtfn_bus(struct pci_dev *dev, int vf_id) |
| 23 | { |
| 24 | if (!dev->is_physfn) |
| 25 | return -EINVAL; |
| 26 | return dev->bus->number + ((dev->devfn + dev->sriov->offset + |
| 27 | dev->sriov->stride * vf_id) >> 8); |
| 28 | } |
| 29 | |
| 30 | int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id) |
| 31 | { |
| 32 | if (!dev->is_physfn) |
| 33 | return -EINVAL; |
| 34 | return (dev->devfn + dev->sriov->offset + |
| 35 | dev->sriov->stride * vf_id) & 0xff; |
| 36 | } |
| 37 | |
| 38 | /* |
| 39 | * Per SR-IOV spec sec 3.3.10 and 3.3.11, First VF Offset and VF Stride may |
| 40 | * change when NumVFs changes. |
| 41 | * |
| 42 | * Update iov->offset and iov->stride when NumVFs is written. |
| 43 | */ |
| 44 | static inline void pci_iov_set_numvfs(struct pci_dev *dev, int nr_virtfn) |
| 45 | { |
| 46 | struct pci_sriov *iov = dev->sriov; |
| 47 | |
| 48 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn); |
| 49 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &iov->offset); |
| 50 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &iov->stride); |
| 51 | } |
| 52 | |
| 53 | /* |
| 54 | * The PF consumes one bus number. NumVFs, First VF Offset, and VF Stride |
| 55 | * determine how many additional bus numbers will be consumed by VFs. |
| 56 | * |
| 57 | * Iterate over all valid NumVFs, validate offset and stride, and calculate |
| 58 | * the maximum number of bus numbers that could ever be required. |
| 59 | */ |
| 60 | static int compute_max_vf_buses(struct pci_dev *dev) |
| 61 | { |
| 62 | struct pci_sriov *iov = dev->sriov; |
| 63 | int nr_virtfn, busnr, rc = 0; |
| 64 | |
| 65 | for (nr_virtfn = iov->total_VFs; nr_virtfn; nr_virtfn--) { |
| 66 | pci_iov_set_numvfs(dev, nr_virtfn); |
| 67 | if (!iov->offset || (nr_virtfn > 1 && !iov->stride)) { |
| 68 | rc = -EIO; |
| 69 | goto out; |
| 70 | } |
| 71 | |
| 72 | busnr = pci_iov_virtfn_bus(dev, nr_virtfn - 1); |
| 73 | if (busnr > iov->max_VF_buses) |
| 74 | iov->max_VF_buses = busnr; |
| 75 | } |
| 76 | |
| 77 | out: |
| 78 | pci_iov_set_numvfs(dev, 0); |
| 79 | return rc; |
| 80 | } |
| 81 | |
| 82 | static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr) |
| 83 | { |
| 84 | struct pci_bus *child; |
| 85 | |
| 86 | if (bus->number == busnr) |
| 87 | return bus; |
| 88 | |
| 89 | child = pci_find_bus(pci_domain_nr(bus), busnr); |
| 90 | if (child) |
| 91 | return child; |
| 92 | |
| 93 | child = pci_add_new_bus(bus, NULL, busnr); |
| 94 | if (!child) |
| 95 | return NULL; |
| 96 | |
| 97 | pci_bus_insert_busn_res(child, busnr, busnr); |
| 98 | |
| 99 | return child; |
| 100 | } |
| 101 | |
| 102 | static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus) |
| 103 | { |
| 104 | if (physbus != virtbus && list_empty(&virtbus->devices)) |
| 105 | pci_remove_bus(virtbus); |
| 106 | } |
| 107 | |
| 108 | resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) |
| 109 | { |
| 110 | if (!dev->is_physfn) |
| 111 | return 0; |
| 112 | |
| 113 | return dev->sriov->barsz[resno - PCI_IOV_RESOURCES]; |
| 114 | } |
| 115 | |
| 116 | static int virtfn_add(struct pci_dev *dev, int id, int reset) |
| 117 | { |
| 118 | int i; |
| 119 | int rc = -ENOMEM; |
| 120 | u64 size; |
| 121 | char buf[VIRTFN_ID_LEN]; |
| 122 | struct pci_dev *virtfn; |
| 123 | struct resource *res; |
| 124 | struct pci_sriov *iov = dev->sriov; |
| 125 | struct pci_bus *bus; |
| 126 | |
| 127 | mutex_lock(&iov->dev->sriov->lock); |
| 128 | bus = virtfn_add_bus(dev->bus, pci_iov_virtfn_bus(dev, id)); |
| 129 | if (!bus) |
| 130 | goto failed; |
| 131 | |
| 132 | virtfn = pci_alloc_dev(bus); |
| 133 | if (!virtfn) |
| 134 | goto failed0; |
| 135 | |
| 136 | virtfn->devfn = pci_iov_virtfn_devfn(dev, id); |
| 137 | virtfn->vendor = dev->vendor; |
| 138 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device); |
| 139 | pci_setup_device(virtfn); |
| 140 | virtfn->dev.parent = dev->dev.parent; |
| 141 | virtfn->physfn = pci_dev_get(dev); |
| 142 | virtfn->is_virtfn = 1; |
| 143 | virtfn->multifunction = 0; |
| 144 | |
| 145 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { |
| 146 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
| 147 | if (!res->parent) |
| 148 | continue; |
| 149 | virtfn->resource[i].name = pci_name(virtfn); |
| 150 | virtfn->resource[i].flags = res->flags; |
| 151 | size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES); |
| 152 | virtfn->resource[i].start = res->start + size * id; |
| 153 | virtfn->resource[i].end = virtfn->resource[i].start + size - 1; |
| 154 | rc = request_resource(res, &virtfn->resource[i]); |
| 155 | BUG_ON(rc); |
| 156 | } |
| 157 | |
| 158 | if (reset) |
| 159 | __pci_reset_function(virtfn); |
| 160 | |
| 161 | pci_device_add(virtfn, virtfn->bus); |
| 162 | mutex_unlock(&iov->dev->sriov->lock); |
| 163 | |
| 164 | pci_bus_add_device(virtfn); |
| 165 | sprintf(buf, "virtfn%u", id); |
| 166 | rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf); |
| 167 | if (rc) |
| 168 | goto failed1; |
| 169 | rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn"); |
| 170 | if (rc) |
| 171 | goto failed2; |
| 172 | |
| 173 | kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE); |
| 174 | |
| 175 | return 0; |
| 176 | |
| 177 | failed2: |
| 178 | sysfs_remove_link(&dev->dev.kobj, buf); |
| 179 | failed1: |
| 180 | pci_dev_put(dev); |
| 181 | mutex_lock(&iov->dev->sriov->lock); |
| 182 | pci_stop_and_remove_bus_device(virtfn); |
| 183 | failed0: |
| 184 | virtfn_remove_bus(dev->bus, bus); |
| 185 | failed: |
| 186 | mutex_unlock(&iov->dev->sriov->lock); |
| 187 | |
| 188 | return rc; |
| 189 | } |
| 190 | |
| 191 | static void virtfn_remove(struct pci_dev *dev, int id, int reset) |
| 192 | { |
| 193 | char buf[VIRTFN_ID_LEN]; |
| 194 | struct pci_dev *virtfn; |
| 195 | struct pci_sriov *iov = dev->sriov; |
| 196 | |
| 197 | virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus), |
| 198 | pci_iov_virtfn_bus(dev, id), |
| 199 | pci_iov_virtfn_devfn(dev, id)); |
| 200 | if (!virtfn) |
| 201 | return; |
| 202 | |
| 203 | if (reset) { |
| 204 | device_release_driver(&virtfn->dev); |
| 205 | __pci_reset_function(virtfn); |
| 206 | } |
| 207 | |
| 208 | sprintf(buf, "virtfn%u", id); |
| 209 | sysfs_remove_link(&dev->dev.kobj, buf); |
| 210 | /* |
| 211 | * pci_stop_dev() could have been called for this virtfn already, |
| 212 | * so the directory for the virtfn may have been removed before. |
| 213 | * Double check to avoid spurious sysfs warnings. |
| 214 | */ |
| 215 | if (virtfn->dev.kobj.sd) |
| 216 | sysfs_remove_link(&virtfn->dev.kobj, "physfn"); |
| 217 | |
| 218 | mutex_lock(&iov->dev->sriov->lock); |
| 219 | pci_stop_and_remove_bus_device(virtfn); |
| 220 | virtfn_remove_bus(dev->bus, virtfn->bus); |
| 221 | mutex_unlock(&iov->dev->sriov->lock); |
| 222 | |
| 223 | /* balance pci_get_domain_bus_and_slot() */ |
| 224 | pci_dev_put(virtfn); |
| 225 | pci_dev_put(dev); |
| 226 | } |
| 227 | |
| 228 | int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs) |
| 229 | { |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | int __weak pcibios_sriov_disable(struct pci_dev *pdev) |
| 234 | { |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | static int sriov_enable(struct pci_dev *dev, int nr_virtfn) |
| 239 | { |
| 240 | int rc; |
| 241 | int i; |
| 242 | int nres; |
| 243 | u16 initial; |
| 244 | struct resource *res; |
| 245 | struct pci_dev *pdev; |
| 246 | struct pci_sriov *iov = dev->sriov; |
| 247 | int bars = 0; |
| 248 | int bus; |
| 249 | |
| 250 | if (!nr_virtfn) |
| 251 | return 0; |
| 252 | |
| 253 | if (iov->num_VFs) |
| 254 | return -EINVAL; |
| 255 | |
| 256 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial); |
| 257 | if (initial > iov->total_VFs || |
| 258 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs))) |
| 259 | return -EIO; |
| 260 | |
| 261 | if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs || |
| 262 | (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial))) |
| 263 | return -EINVAL; |
| 264 | |
| 265 | nres = 0; |
| 266 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { |
| 267 | bars |= (1 << (i + PCI_IOV_RESOURCES)); |
| 268 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
| 269 | if (res->parent) |
| 270 | nres++; |
| 271 | } |
| 272 | if (nres != iov->nres) { |
| 273 | dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n"); |
| 274 | return -ENOMEM; |
| 275 | } |
| 276 | |
| 277 | bus = pci_iov_virtfn_bus(dev, nr_virtfn - 1); |
| 278 | if (bus > dev->bus->busn_res.end) { |
| 279 | dev_err(&dev->dev, "can't enable %d VFs (bus %02x out of range of %pR)\n", |
| 280 | nr_virtfn, bus, &dev->bus->busn_res); |
| 281 | return -ENOMEM; |
| 282 | } |
| 283 | |
| 284 | if (pci_enable_resources(dev, bars)) { |
| 285 | dev_err(&dev->dev, "SR-IOV: IOV BARS not allocated\n"); |
| 286 | return -ENOMEM; |
| 287 | } |
| 288 | |
| 289 | if (iov->link != dev->devfn) { |
| 290 | pdev = pci_get_slot(dev->bus, iov->link); |
| 291 | if (!pdev) |
| 292 | return -ENODEV; |
| 293 | |
| 294 | if (!pdev->is_physfn) { |
| 295 | pci_dev_put(pdev); |
| 296 | return -ENOSYS; |
| 297 | } |
| 298 | |
| 299 | rc = sysfs_create_link(&dev->dev.kobj, |
| 300 | &pdev->dev.kobj, "dep_link"); |
| 301 | pci_dev_put(pdev); |
| 302 | if (rc) |
| 303 | return rc; |
| 304 | } |
| 305 | |
| 306 | pci_iov_set_numvfs(dev, nr_virtfn); |
| 307 | iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE; |
| 308 | pci_cfg_access_lock(dev); |
| 309 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
| 310 | msleep(100); |
| 311 | pci_cfg_access_unlock(dev); |
| 312 | |
| 313 | iov->initial_VFs = initial; |
| 314 | if (nr_virtfn < initial) |
| 315 | initial = nr_virtfn; |
| 316 | |
| 317 | rc = pcibios_sriov_enable(dev, initial); |
| 318 | if (rc) { |
| 319 | dev_err(&dev->dev, "failure %d from pcibios_sriov_enable()\n", rc); |
| 320 | goto err_pcibios; |
| 321 | } |
| 322 | |
| 323 | for (i = 0; i < initial; i++) { |
| 324 | rc = virtfn_add(dev, i, 0); |
| 325 | if (rc) |
| 326 | goto failed; |
| 327 | } |
| 328 | |
| 329 | kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE); |
| 330 | iov->num_VFs = nr_virtfn; |
| 331 | |
| 332 | return 0; |
| 333 | |
| 334 | failed: |
| 335 | while (i--) |
| 336 | virtfn_remove(dev, i, 0); |
| 337 | |
| 338 | pcibios_sriov_disable(dev); |
| 339 | err_pcibios: |
| 340 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); |
| 341 | pci_cfg_access_lock(dev); |
| 342 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
| 343 | ssleep(1); |
| 344 | pci_cfg_access_unlock(dev); |
| 345 | |
| 346 | if (iov->link != dev->devfn) |
| 347 | sysfs_remove_link(&dev->dev.kobj, "dep_link"); |
| 348 | |
| 349 | pci_iov_set_numvfs(dev, 0); |
| 350 | return rc; |
| 351 | } |
| 352 | |
| 353 | static void sriov_disable(struct pci_dev *dev) |
| 354 | { |
| 355 | int i; |
| 356 | struct pci_sriov *iov = dev->sriov; |
| 357 | |
| 358 | if (!iov->num_VFs) |
| 359 | return; |
| 360 | |
| 361 | for (i = 0; i < iov->num_VFs; i++) |
| 362 | virtfn_remove(dev, i, 0); |
| 363 | |
| 364 | pcibios_sriov_disable(dev); |
| 365 | |
| 366 | iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); |
| 367 | pci_cfg_access_lock(dev); |
| 368 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
| 369 | ssleep(1); |
| 370 | pci_cfg_access_unlock(dev); |
| 371 | |
| 372 | if (iov->link != dev->devfn) |
| 373 | sysfs_remove_link(&dev->dev.kobj, "dep_link"); |
| 374 | |
| 375 | iov->num_VFs = 0; |
| 376 | pci_iov_set_numvfs(dev, 0); |
| 377 | } |
| 378 | |
| 379 | static int sriov_init(struct pci_dev *dev, int pos) |
| 380 | { |
| 381 | int i, bar64; |
| 382 | int rc; |
| 383 | int nres; |
| 384 | u32 pgsz; |
| 385 | u16 ctrl, total; |
| 386 | struct pci_sriov *iov; |
| 387 | struct resource *res; |
| 388 | struct pci_dev *pdev; |
| 389 | |
| 390 | if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_END && |
| 391 | pci_pcie_type(dev) != PCI_EXP_TYPE_ENDPOINT) |
| 392 | return -ENODEV; |
| 393 | |
| 394 | pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl); |
| 395 | if (ctrl & PCI_SRIOV_CTRL_VFE) { |
| 396 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0); |
| 397 | ssleep(1); |
| 398 | } |
| 399 | |
| 400 | ctrl = 0; |
| 401 | list_for_each_entry(pdev, &dev->bus->devices, bus_list) |
| 402 | if (pdev->is_physfn) |
| 403 | goto found; |
| 404 | |
| 405 | pdev = NULL; |
| 406 | if (pci_ari_enabled(dev->bus)) |
| 407 | ctrl |= PCI_SRIOV_CTRL_ARI; |
| 408 | |
| 409 | found: |
| 410 | pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl); |
| 411 | |
| 412 | pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total); |
| 413 | if (!total) |
| 414 | return 0; |
| 415 | |
| 416 | pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz); |
| 417 | i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0; |
| 418 | pgsz &= ~((1 << i) - 1); |
| 419 | if (!pgsz) |
| 420 | return -EIO; |
| 421 | |
| 422 | pgsz &= ~(pgsz - 1); |
| 423 | pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz); |
| 424 | |
| 425 | iov = kzalloc(sizeof(*iov), GFP_KERNEL); |
| 426 | if (!iov) |
| 427 | return -ENOMEM; |
| 428 | |
| 429 | nres = 0; |
| 430 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { |
| 431 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
| 432 | /* |
| 433 | * If it is already FIXED, don't change it, something |
| 434 | * (perhaps EA or header fixups) wants it this way. |
| 435 | */ |
| 436 | if (res->flags & IORESOURCE_PCI_FIXED) |
| 437 | bar64 = (res->flags & IORESOURCE_MEM_64) ? 1 : 0; |
| 438 | else |
| 439 | bar64 = __pci_read_base(dev, pci_bar_unknown, res, |
| 440 | pos + PCI_SRIOV_BAR + i * 4); |
| 441 | if (!res->flags) |
| 442 | continue; |
| 443 | if (resource_size(res) & (PAGE_SIZE - 1)) { |
| 444 | rc = -EIO; |
| 445 | goto failed; |
| 446 | } |
| 447 | iov->barsz[i] = resource_size(res); |
| 448 | res->end = res->start + resource_size(res) * total - 1; |
| 449 | dev_info(&dev->dev, "VF(n) BAR%d space: %pR (contains BAR%d for %d VFs)\n", |
| 450 | i, res, i, total); |
| 451 | i += bar64; |
| 452 | nres++; |
| 453 | } |
| 454 | |
| 455 | iov->pos = pos; |
| 456 | iov->nres = nres; |
| 457 | iov->ctrl = ctrl; |
| 458 | iov->total_VFs = total; |
| 459 | iov->pgsz = pgsz; |
| 460 | iov->self = dev; |
| 461 | pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap); |
| 462 | pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link); |
| 463 | if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) |
| 464 | iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link); |
| 465 | |
| 466 | if (pdev) |
| 467 | iov->dev = pci_dev_get(pdev); |
| 468 | else |
| 469 | iov->dev = dev; |
| 470 | |
| 471 | mutex_init(&iov->lock); |
| 472 | |
| 473 | dev->sriov = iov; |
| 474 | dev->is_physfn = 1; |
| 475 | rc = compute_max_vf_buses(dev); |
| 476 | if (rc) |
| 477 | goto fail_max_buses; |
| 478 | |
| 479 | return 0; |
| 480 | |
| 481 | fail_max_buses: |
| 482 | dev->sriov = NULL; |
| 483 | dev->is_physfn = 0; |
| 484 | failed: |
| 485 | for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { |
| 486 | res = &dev->resource[i + PCI_IOV_RESOURCES]; |
| 487 | res->flags = 0; |
| 488 | } |
| 489 | |
| 490 | kfree(iov); |
| 491 | return rc; |
| 492 | } |
| 493 | |
| 494 | static void sriov_release(struct pci_dev *dev) |
| 495 | { |
| 496 | BUG_ON(dev->sriov->num_VFs); |
| 497 | |
| 498 | if (dev != dev->sriov->dev) |
| 499 | pci_dev_put(dev->sriov->dev); |
| 500 | |
| 501 | mutex_destroy(&dev->sriov->lock); |
| 502 | |
| 503 | kfree(dev->sriov); |
| 504 | dev->sriov = NULL; |
| 505 | } |
| 506 | |
| 507 | static void sriov_restore_state(struct pci_dev *dev) |
| 508 | { |
| 509 | int i; |
| 510 | u16 ctrl; |
| 511 | struct pci_sriov *iov = dev->sriov; |
| 512 | |
| 513 | pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl); |
| 514 | if (ctrl & PCI_SRIOV_CTRL_VFE) |
| 515 | return; |
| 516 | |
| 517 | for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) |
| 518 | pci_update_resource(dev, i); |
| 519 | |
| 520 | pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz); |
| 521 | pci_iov_set_numvfs(dev, iov->num_VFs); |
| 522 | pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); |
| 523 | if (iov->ctrl & PCI_SRIOV_CTRL_VFE) |
| 524 | msleep(100); |
| 525 | } |
| 526 | |
| 527 | /** |
| 528 | * pci_iov_init - initialize the IOV capability |
| 529 | * @dev: the PCI device |
| 530 | * |
| 531 | * Returns 0 on success, or negative on failure. |
| 532 | */ |
| 533 | int pci_iov_init(struct pci_dev *dev) |
| 534 | { |
| 535 | int pos; |
| 536 | |
| 537 | if (!pci_is_pcie(dev)) |
| 538 | return -ENODEV; |
| 539 | |
| 540 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV); |
| 541 | if (pos) |
| 542 | return sriov_init(dev, pos); |
| 543 | |
| 544 | return -ENODEV; |
| 545 | } |
| 546 | |
| 547 | /** |
| 548 | * pci_iov_release - release resources used by the IOV capability |
| 549 | * @dev: the PCI device |
| 550 | */ |
| 551 | void pci_iov_release(struct pci_dev *dev) |
| 552 | { |
| 553 | if (dev->is_physfn) |
| 554 | sriov_release(dev); |
| 555 | } |
| 556 | |
| 557 | /** |
| 558 | * pci_iov_resource_bar - get position of the SR-IOV BAR |
| 559 | * @dev: the PCI device |
| 560 | * @resno: the resource number |
| 561 | * |
| 562 | * Returns position of the BAR encapsulated in the SR-IOV capability. |
| 563 | */ |
| 564 | int pci_iov_resource_bar(struct pci_dev *dev, int resno) |
| 565 | { |
| 566 | if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END) |
| 567 | return 0; |
| 568 | |
| 569 | BUG_ON(!dev->is_physfn); |
| 570 | |
| 571 | return dev->sriov->pos + PCI_SRIOV_BAR + |
| 572 | 4 * (resno - PCI_IOV_RESOURCES); |
| 573 | } |
| 574 | |
| 575 | resource_size_t __weak pcibios_iov_resource_alignment(struct pci_dev *dev, |
| 576 | int resno) |
| 577 | { |
| 578 | return pci_iov_resource_size(dev, resno); |
| 579 | } |
| 580 | |
| 581 | /** |
| 582 | * pci_sriov_resource_alignment - get resource alignment for VF BAR |
| 583 | * @dev: the PCI device |
| 584 | * @resno: the resource number |
| 585 | * |
| 586 | * Returns the alignment of the VF BAR found in the SR-IOV capability. |
| 587 | * This is not the same as the resource size which is defined as |
| 588 | * the VF BAR size multiplied by the number of VFs. The alignment |
| 589 | * is just the VF BAR size. |
| 590 | */ |
| 591 | resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno) |
| 592 | { |
| 593 | return pcibios_iov_resource_alignment(dev, resno); |
| 594 | } |
| 595 | |
| 596 | /** |
| 597 | * pci_restore_iov_state - restore the state of the IOV capability |
| 598 | * @dev: the PCI device |
| 599 | */ |
| 600 | void pci_restore_iov_state(struct pci_dev *dev) |
| 601 | { |
| 602 | if (dev->is_physfn) |
| 603 | sriov_restore_state(dev); |
| 604 | } |
| 605 | |
| 606 | /** |
| 607 | * pci_iov_bus_range - find bus range used by Virtual Function |
| 608 | * @bus: the PCI bus |
| 609 | * |
| 610 | * Returns max number of buses (exclude current one) used by Virtual |
| 611 | * Functions. |
| 612 | */ |
| 613 | int pci_iov_bus_range(struct pci_bus *bus) |
| 614 | { |
| 615 | int max = 0; |
| 616 | struct pci_dev *dev; |
| 617 | |
| 618 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 619 | if (!dev->is_physfn) |
| 620 | continue; |
| 621 | if (dev->sriov->max_VF_buses > max) |
| 622 | max = dev->sriov->max_VF_buses; |
| 623 | } |
| 624 | |
| 625 | return max ? max - bus->number : 0; |
| 626 | } |
| 627 | |
| 628 | /** |
| 629 | * pci_enable_sriov - enable the SR-IOV capability |
| 630 | * @dev: the PCI device |
| 631 | * @nr_virtfn: number of virtual functions to enable |
| 632 | * |
| 633 | * Returns 0 on success, or negative on failure. |
| 634 | */ |
| 635 | int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn) |
| 636 | { |
| 637 | might_sleep(); |
| 638 | |
| 639 | if (!dev->is_physfn) |
| 640 | return -ENOSYS; |
| 641 | |
| 642 | return sriov_enable(dev, nr_virtfn); |
| 643 | } |
| 644 | EXPORT_SYMBOL_GPL(pci_enable_sriov); |
| 645 | |
| 646 | /** |
| 647 | * pci_disable_sriov - disable the SR-IOV capability |
| 648 | * @dev: the PCI device |
| 649 | */ |
| 650 | void pci_disable_sriov(struct pci_dev *dev) |
| 651 | { |
| 652 | might_sleep(); |
| 653 | |
| 654 | if (!dev->is_physfn) |
| 655 | return; |
| 656 | |
| 657 | sriov_disable(dev); |
| 658 | } |
| 659 | EXPORT_SYMBOL_GPL(pci_disable_sriov); |
| 660 | |
| 661 | /** |
| 662 | * pci_num_vf - return number of VFs associated with a PF device_release_driver |
| 663 | * @dev: the PCI device |
| 664 | * |
| 665 | * Returns number of VFs, or 0 if SR-IOV is not enabled. |
| 666 | */ |
| 667 | int pci_num_vf(struct pci_dev *dev) |
| 668 | { |
| 669 | if (!dev->is_physfn) |
| 670 | return 0; |
| 671 | |
| 672 | return dev->sriov->num_VFs; |
| 673 | } |
| 674 | EXPORT_SYMBOL_GPL(pci_num_vf); |
| 675 | |
| 676 | /** |
| 677 | * pci_vfs_assigned - returns number of VFs are assigned to a guest |
| 678 | * @dev: the PCI device |
| 679 | * |
| 680 | * Returns number of VFs belonging to this device that are assigned to a guest. |
| 681 | * If device is not a physical function returns 0. |
| 682 | */ |
| 683 | int pci_vfs_assigned(struct pci_dev *dev) |
| 684 | { |
| 685 | struct pci_dev *vfdev; |
| 686 | unsigned int vfs_assigned = 0; |
| 687 | unsigned short dev_id; |
| 688 | |
| 689 | /* only search if we are a PF */ |
| 690 | if (!dev->is_physfn) |
| 691 | return 0; |
| 692 | |
| 693 | /* |
| 694 | * determine the device ID for the VFs, the vendor ID will be the |
| 695 | * same as the PF so there is no need to check for that one |
| 696 | */ |
| 697 | pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id); |
| 698 | |
| 699 | /* loop through all the VFs to see if we own any that are assigned */ |
| 700 | vfdev = pci_get_device(dev->vendor, dev_id, NULL); |
| 701 | while (vfdev) { |
| 702 | /* |
| 703 | * It is considered assigned if it is a virtual function with |
| 704 | * our dev as the physical function and the assigned bit is set |
| 705 | */ |
| 706 | if (vfdev->is_virtfn && (vfdev->physfn == dev) && |
| 707 | pci_is_dev_assigned(vfdev)) |
| 708 | vfs_assigned++; |
| 709 | |
| 710 | vfdev = pci_get_device(dev->vendor, dev_id, vfdev); |
| 711 | } |
| 712 | |
| 713 | return vfs_assigned; |
| 714 | } |
| 715 | EXPORT_SYMBOL_GPL(pci_vfs_assigned); |
| 716 | |
| 717 | /** |
| 718 | * pci_sriov_set_totalvfs -- reduce the TotalVFs available |
| 719 | * @dev: the PCI PF device |
| 720 | * @numvfs: number that should be used for TotalVFs supported |
| 721 | * |
| 722 | * Should be called from PF driver's probe routine with |
| 723 | * device's mutex held. |
| 724 | * |
| 725 | * Returns 0 if PF is an SRIOV-capable device and |
| 726 | * value of numvfs valid. If not a PF return -ENOSYS; |
| 727 | * if numvfs is invalid return -EINVAL; |
| 728 | * if VFs already enabled, return -EBUSY. |
| 729 | */ |
| 730 | int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs) |
| 731 | { |
| 732 | if (!dev->is_physfn) |
| 733 | return -ENOSYS; |
| 734 | if (numvfs > dev->sriov->total_VFs) |
| 735 | return -EINVAL; |
| 736 | |
| 737 | /* Shouldn't change if VFs already enabled */ |
| 738 | if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE) |
| 739 | return -EBUSY; |
| 740 | else |
| 741 | dev->sriov->driver_max_VFs = numvfs; |
| 742 | |
| 743 | return 0; |
| 744 | } |
| 745 | EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs); |
| 746 | |
| 747 | /** |
| 748 | * pci_sriov_get_totalvfs -- get total VFs supported on this device |
| 749 | * @dev: the PCI PF device |
| 750 | * |
| 751 | * For a PCIe device with SRIOV support, return the PCIe |
| 752 | * SRIOV capability value of TotalVFs or the value of driver_max_VFs |
| 753 | * if the driver reduced it. Otherwise 0. |
| 754 | */ |
| 755 | int pci_sriov_get_totalvfs(struct pci_dev *dev) |
| 756 | { |
| 757 | if (!dev->is_physfn) |
| 758 | return 0; |
| 759 | |
| 760 | if (dev->sriov->driver_max_VFs) |
| 761 | return dev->sriov->driver_max_VFs; |
| 762 | |
| 763 | return dev->sriov->total_VFs; |
| 764 | } |
| 765 | EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs); |