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 static inline u8 virtfn_bus(struct pci_dev *dev, int id) 23 { 24 return dev->bus->number + ((dev->devfn + dev->sriov->offset + 25 dev->sriov->stride * id) >> 8); 26 } 27 28 static inline u8 virtfn_devfn(struct pci_dev *dev, int id) 29 { 30 return (dev->devfn + dev->sriov->offset + 31 dev->sriov->stride * id) & 0xff; 32 } 33 34 static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr) 35 { 36 int rc; 37 struct pci_bus *child; 38 39 if (bus->number == busnr) 40 return bus; 41 42 child = pci_find_bus(pci_domain_nr(bus), busnr); 43 if (child) 44 return child; 45 46 child = pci_add_new_bus(bus, NULL, busnr); 47 if (!child) 48 return NULL; 49 50 child->subordinate = busnr; 51 child->dev.parent = bus->bridge; 52 rc = pci_bus_add_child(child); 53 if (rc) { 54 pci_remove_bus(child); 55 return NULL; 56 } 57 58 return child; 59 } 60 61 static void virtfn_remove_bus(struct pci_bus *bus, int busnr) 62 { 63 struct pci_bus *child; 64 65 if (bus->number == busnr) 66 return; 67 68 child = pci_find_bus(pci_domain_nr(bus), busnr); 69 BUG_ON(!child); 70 71 if (list_empty(&child->devices)) 72 pci_remove_bus(child); 73 } 74 75 static int virtfn_add(struct pci_dev *dev, int id, int reset) 76 { 77 int i; 78 int rc; 79 u64 size; 80 char buf[VIRTFN_ID_LEN]; 81 struct pci_dev *virtfn; 82 struct resource *res; 83 struct pci_sriov *iov = dev->sriov; 84 85 virtfn = alloc_pci_dev(); 86 if (!virtfn) 87 return -ENOMEM; 88 89 mutex_lock(&iov->dev->sriov->lock); 90 virtfn->bus = virtfn_add_bus(dev->bus, virtfn_bus(dev, id)); 91 if (!virtfn->bus) { 92 kfree(virtfn); 93 mutex_unlock(&iov->dev->sriov->lock); 94 return -ENOMEM; 95 } 96 virtfn->devfn = virtfn_devfn(dev, id); 97 virtfn->vendor = dev->vendor; 98 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device); 99 pci_setup_device(virtfn); 100 virtfn->dev.parent = dev->dev.parent; 101 102 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { 103 res = dev->resource + PCI_IOV_RESOURCES + i; 104 if (!res->parent) 105 continue; 106 virtfn->resource[i].name = pci_name(virtfn); 107 virtfn->resource[i].flags = res->flags; 108 size = resource_size(res); 109 do_div(size, iov->total); 110 virtfn->resource[i].start = res->start + size * id; 111 virtfn->resource[i].end = virtfn->resource[i].start + size - 1; 112 rc = request_resource(res, &virtfn->resource[i]); 113 BUG_ON(rc); 114 } 115 116 if (reset) 117 __pci_reset_function(virtfn); 118 119 pci_device_add(virtfn, virtfn->bus); 120 mutex_unlock(&iov->dev->sriov->lock); 121 122 virtfn->physfn = pci_dev_get(dev); 123 virtfn->is_virtfn = 1; 124 125 rc = pci_bus_add_device(virtfn); 126 if (rc) 127 goto failed1; 128 sprintf(buf, "virtfn%u", id); 129 rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf); 130 if (rc) 131 goto failed1; 132 rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn"); 133 if (rc) 134 goto failed2; 135 136 kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE); 137 138 return 0; 139 140 failed2: 141 sysfs_remove_link(&dev->dev.kobj, buf); 142 failed1: 143 pci_dev_put(dev); 144 mutex_lock(&iov->dev->sriov->lock); 145 pci_remove_bus_device(virtfn); 146 virtfn_remove_bus(dev->bus, virtfn_bus(dev, id)); 147 mutex_unlock(&iov->dev->sriov->lock); 148 149 return rc; 150 } 151 152 static void virtfn_remove(struct pci_dev *dev, int id, int reset) 153 { 154 char buf[VIRTFN_ID_LEN]; 155 struct pci_bus *bus; 156 struct pci_dev *virtfn; 157 struct pci_sriov *iov = dev->sriov; 158 159 bus = pci_find_bus(pci_domain_nr(dev->bus), virtfn_bus(dev, id)); 160 if (!bus) 161 return; 162 163 virtfn = pci_get_slot(bus, virtfn_devfn(dev, id)); 164 if (!virtfn) 165 return; 166 167 pci_dev_put(virtfn); 168 169 if (reset) { 170 device_release_driver(&virtfn->dev); 171 __pci_reset_function(virtfn); 172 } 173 174 sprintf(buf, "virtfn%u", id); 175 sysfs_remove_link(&dev->dev.kobj, buf); 176 sysfs_remove_link(&virtfn->dev.kobj, "physfn"); 177 178 mutex_lock(&iov->dev->sriov->lock); 179 pci_remove_bus_device(virtfn); 180 virtfn_remove_bus(dev->bus, virtfn_bus(dev, id)); 181 mutex_unlock(&iov->dev->sriov->lock); 182 183 pci_dev_put(dev); 184 } 185 186 static int sriov_migration(struct pci_dev *dev) 187 { 188 u16 status; 189 struct pci_sriov *iov = dev->sriov; 190 191 if (!iov->nr_virtfn) 192 return 0; 193 194 if (!(iov->cap & PCI_SRIOV_CAP_VFM)) 195 return 0; 196 197 pci_read_config_word(dev, iov->pos + PCI_SRIOV_STATUS, &status); 198 if (!(status & PCI_SRIOV_STATUS_VFM)) 199 return 0; 200 201 schedule_work(&iov->mtask); 202 203 return 1; 204 } 205 206 static void sriov_migration_task(struct work_struct *work) 207 { 208 int i; 209 u8 state; 210 u16 status; 211 struct pci_sriov *iov = container_of(work, struct pci_sriov, mtask); 212 213 for (i = iov->initial; i < iov->nr_virtfn; i++) { 214 state = readb(iov->mstate + i); 215 if (state == PCI_SRIOV_VFM_MI) { 216 writeb(PCI_SRIOV_VFM_AV, iov->mstate + i); 217 state = readb(iov->mstate + i); 218 if (state == PCI_SRIOV_VFM_AV) 219 virtfn_add(iov->self, i, 1); 220 } else if (state == PCI_SRIOV_VFM_MO) { 221 virtfn_remove(iov->self, i, 1); 222 writeb(PCI_SRIOV_VFM_UA, iov->mstate + i); 223 state = readb(iov->mstate + i); 224 if (state == PCI_SRIOV_VFM_AV) 225 virtfn_add(iov->self, i, 0); 226 } 227 } 228 229 pci_read_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, &status); 230 status &= ~PCI_SRIOV_STATUS_VFM; 231 pci_write_config_word(iov->self, iov->pos + PCI_SRIOV_STATUS, status); 232 } 233 234 static int sriov_enable_migration(struct pci_dev *dev, int nr_virtfn) 235 { 236 int bir; 237 u32 table; 238 resource_size_t pa; 239 struct pci_sriov *iov = dev->sriov; 240 241 if (nr_virtfn <= iov->initial) 242 return 0; 243 244 pci_read_config_dword(dev, iov->pos + PCI_SRIOV_VFM, &table); 245 bir = PCI_SRIOV_VFM_BIR(table); 246 if (bir > PCI_STD_RESOURCE_END) 247 return -EIO; 248 249 table = PCI_SRIOV_VFM_OFFSET(table); 250 if (table + nr_virtfn > pci_resource_len(dev, bir)) 251 return -EIO; 252 253 pa = pci_resource_start(dev, bir) + table; 254 iov->mstate = ioremap(pa, nr_virtfn); 255 if (!iov->mstate) 256 return -ENOMEM; 257 258 INIT_WORK(&iov->mtask, sriov_migration_task); 259 260 iov->ctrl |= PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR; 261 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); 262 263 return 0; 264 } 265 266 static void sriov_disable_migration(struct pci_dev *dev) 267 { 268 struct pci_sriov *iov = dev->sriov; 269 270 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFM | PCI_SRIOV_CTRL_INTR); 271 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); 272 273 cancel_work_sync(&iov->mtask); 274 iounmap(iov->mstate); 275 } 276 277 static int sriov_enable(struct pci_dev *dev, int nr_virtfn) 278 { 279 int rc; 280 int i, j; 281 int nres; 282 u16 offset, stride, initial; 283 struct resource *res; 284 struct pci_dev *pdev; 285 struct pci_sriov *iov = dev->sriov; 286 287 if (!nr_virtfn) 288 return 0; 289 290 if (iov->nr_virtfn) 291 return -EINVAL; 292 293 pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial); 294 if (initial > iov->total || 295 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total))) 296 return -EIO; 297 298 if (nr_virtfn < 0 || nr_virtfn > iov->total || 299 (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial))) 300 return -EINVAL; 301 302 pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn); 303 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &offset); 304 pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &stride); 305 if (!offset || (nr_virtfn > 1 && !stride)) 306 return -EIO; 307 308 nres = 0; 309 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { 310 res = dev->resource + PCI_IOV_RESOURCES + i; 311 if (res->parent) 312 nres++; 313 } 314 if (nres != iov->nres) { 315 dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n"); 316 return -ENOMEM; 317 } 318 319 iov->offset = offset; 320 iov->stride = stride; 321 322 if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->subordinate) { 323 dev_err(&dev->dev, "SR-IOV: bus number out of range\n"); 324 return -ENOMEM; 325 } 326 327 if (iov->link != dev->devfn) { 328 pdev = pci_get_slot(dev->bus, iov->link); 329 if (!pdev) 330 return -ENODEV; 331 332 pci_dev_put(pdev); 333 334 if (!pdev->is_physfn) 335 return -ENODEV; 336 337 rc = sysfs_create_link(&dev->dev.kobj, 338 &pdev->dev.kobj, "dep_link"); 339 if (rc) 340 return rc; 341 } 342 343 iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE; 344 pci_block_user_cfg_access(dev); 345 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); 346 msleep(100); 347 pci_unblock_user_cfg_access(dev); 348 349 iov->initial = initial; 350 if (nr_virtfn < initial) 351 initial = nr_virtfn; 352 353 for (i = 0; i < initial; i++) { 354 rc = virtfn_add(dev, i, 0); 355 if (rc) 356 goto failed; 357 } 358 359 if (iov->cap & PCI_SRIOV_CAP_VFM) { 360 rc = sriov_enable_migration(dev, nr_virtfn); 361 if (rc) 362 goto failed; 363 } 364 365 kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE); 366 iov->nr_virtfn = nr_virtfn; 367 368 return 0; 369 370 failed: 371 for (j = 0; j < i; j++) 372 virtfn_remove(dev, j, 0); 373 374 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); 375 pci_block_user_cfg_access(dev); 376 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); 377 ssleep(1); 378 pci_unblock_user_cfg_access(dev); 379 380 if (iov->link != dev->devfn) 381 sysfs_remove_link(&dev->dev.kobj, "dep_link"); 382 383 return rc; 384 } 385 386 static void sriov_disable(struct pci_dev *dev) 387 { 388 int i; 389 struct pci_sriov *iov = dev->sriov; 390 391 if (!iov->nr_virtfn) 392 return; 393 394 if (iov->cap & PCI_SRIOV_CAP_VFM) 395 sriov_disable_migration(dev); 396 397 for (i = 0; i < iov->nr_virtfn; i++) 398 virtfn_remove(dev, i, 0); 399 400 iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); 401 pci_block_user_cfg_access(dev); 402 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); 403 ssleep(1); 404 pci_unblock_user_cfg_access(dev); 405 406 if (iov->link != dev->devfn) 407 sysfs_remove_link(&dev->dev.kobj, "dep_link"); 408 409 iov->nr_virtfn = 0; 410 } 411 412 static int sriov_init(struct pci_dev *dev, int pos) 413 { 414 int i; 415 int rc; 416 int nres; 417 u32 pgsz; 418 u16 ctrl, total, offset, stride; 419 struct pci_sriov *iov; 420 struct resource *res; 421 struct pci_dev *pdev; 422 423 if (dev->pcie_type != PCI_EXP_TYPE_RC_END && 424 dev->pcie_type != PCI_EXP_TYPE_ENDPOINT) 425 return -ENODEV; 426 427 pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl); 428 if (ctrl & PCI_SRIOV_CTRL_VFE) { 429 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0); 430 ssleep(1); 431 } 432 433 pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total); 434 if (!total) 435 return 0; 436 437 ctrl = 0; 438 list_for_each_entry(pdev, &dev->bus->devices, bus_list) 439 if (pdev->is_physfn) 440 goto found; 441 442 pdev = NULL; 443 if (pci_ari_enabled(dev->bus)) 444 ctrl |= PCI_SRIOV_CTRL_ARI; 445 446 found: 447 pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl); 448 pci_write_config_word(dev, pos + PCI_SRIOV_NUM_VF, total); 449 pci_read_config_word(dev, pos + PCI_SRIOV_VF_OFFSET, &offset); 450 pci_read_config_word(dev, pos + PCI_SRIOV_VF_STRIDE, &stride); 451 if (!offset || (total > 1 && !stride)) 452 return -EIO; 453 454 pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz); 455 i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0; 456 pgsz &= ~((1 << i) - 1); 457 if (!pgsz) 458 return -EIO; 459 460 pgsz &= ~(pgsz - 1); 461 pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz); 462 463 nres = 0; 464 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { 465 res = dev->resource + PCI_IOV_RESOURCES + i; 466 i += __pci_read_base(dev, pci_bar_unknown, res, 467 pos + PCI_SRIOV_BAR + i * 4); 468 if (!res->flags) 469 continue; 470 if (resource_size(res) & (PAGE_SIZE - 1)) { 471 rc = -EIO; 472 goto failed; 473 } 474 res->end = res->start + resource_size(res) * total - 1; 475 nres++; 476 } 477 478 iov = kzalloc(sizeof(*iov), GFP_KERNEL); 479 if (!iov) { 480 rc = -ENOMEM; 481 goto failed; 482 } 483 484 iov->pos = pos; 485 iov->nres = nres; 486 iov->ctrl = ctrl; 487 iov->total = total; 488 iov->offset = offset; 489 iov->stride = stride; 490 iov->pgsz = pgsz; 491 iov->self = dev; 492 pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap); 493 pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link); 494 if (dev->pcie_type == PCI_EXP_TYPE_RC_END) 495 iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link); 496 497 if (pdev) 498 iov->dev = pci_dev_get(pdev); 499 else 500 iov->dev = dev; 501 502 mutex_init(&iov->lock); 503 504 dev->sriov = iov; 505 dev->is_physfn = 1; 506 507 return 0; 508 509 failed: 510 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { 511 res = dev->resource + PCI_IOV_RESOURCES + i; 512 res->flags = 0; 513 } 514 515 return rc; 516 } 517 518 static void sriov_release(struct pci_dev *dev) 519 { 520 BUG_ON(dev->sriov->nr_virtfn); 521 522 if (dev != dev->sriov->dev) 523 pci_dev_put(dev->sriov->dev); 524 525 mutex_destroy(&dev->sriov->lock); 526 527 kfree(dev->sriov); 528 dev->sriov = NULL; 529 } 530 531 static void sriov_restore_state(struct pci_dev *dev) 532 { 533 int i; 534 u16 ctrl; 535 struct pci_sriov *iov = dev->sriov; 536 537 pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl); 538 if (ctrl & PCI_SRIOV_CTRL_VFE) 539 return; 540 541 for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) 542 pci_update_resource(dev, i); 543 544 pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz); 545 pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->nr_virtfn); 546 pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); 547 if (iov->ctrl & PCI_SRIOV_CTRL_VFE) 548 msleep(100); 549 } 550 551 /** 552 * pci_iov_init - initialize the IOV capability 553 * @dev: the PCI device 554 * 555 * Returns 0 on success, or negative on failure. 556 */ 557 int pci_iov_init(struct pci_dev *dev) 558 { 559 int pos; 560 561 if (!pci_is_pcie(dev)) 562 return -ENODEV; 563 564 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV); 565 if (pos) 566 return sriov_init(dev, pos); 567 568 return -ENODEV; 569 } 570 571 /** 572 * pci_iov_release - release resources used by the IOV capability 573 * @dev: the PCI device 574 */ 575 void pci_iov_release(struct pci_dev *dev) 576 { 577 if (dev->is_physfn) 578 sriov_release(dev); 579 } 580 581 /** 582 * pci_iov_resource_bar - get position of the SR-IOV BAR 583 * @dev: the PCI device 584 * @resno: the resource number 585 * @type: the BAR type to be filled in 586 * 587 * Returns position of the BAR encapsulated in the SR-IOV capability. 588 */ 589 int pci_iov_resource_bar(struct pci_dev *dev, int resno, 590 enum pci_bar_type *type) 591 { 592 if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END) 593 return 0; 594 595 BUG_ON(!dev->is_physfn); 596 597 *type = pci_bar_unknown; 598 599 return dev->sriov->pos + PCI_SRIOV_BAR + 600 4 * (resno - PCI_IOV_RESOURCES); 601 } 602 603 /** 604 * pci_sriov_resource_alignment - get resource alignment for VF BAR 605 * @dev: the PCI device 606 * @resno: the resource number 607 * 608 * Returns the alignment of the VF BAR found in the SR-IOV capability. 609 * This is not the same as the resource size which is defined as 610 * the VF BAR size multiplied by the number of VFs. The alignment 611 * is just the VF BAR size. 612 */ 613 resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno) 614 { 615 struct resource tmp; 616 enum pci_bar_type type; 617 int reg = pci_iov_resource_bar(dev, resno, &type); 618 619 if (!reg) 620 return 0; 621 622 __pci_read_base(dev, type, &tmp, reg); 623 return resource_alignment(&tmp); 624 } 625 626 /** 627 * pci_restore_iov_state - restore the state of the IOV capability 628 * @dev: the PCI device 629 */ 630 void pci_restore_iov_state(struct pci_dev *dev) 631 { 632 if (dev->is_physfn) 633 sriov_restore_state(dev); 634 } 635 636 /** 637 * pci_iov_bus_range - find bus range used by Virtual Function 638 * @bus: the PCI bus 639 * 640 * Returns max number of buses (exclude current one) used by Virtual 641 * Functions. 642 */ 643 int pci_iov_bus_range(struct pci_bus *bus) 644 { 645 int max = 0; 646 u8 busnr; 647 struct pci_dev *dev; 648 649 list_for_each_entry(dev, &bus->devices, bus_list) { 650 if (!dev->is_physfn) 651 continue; 652 busnr = virtfn_bus(dev, dev->sriov->total - 1); 653 if (busnr > max) 654 max = busnr; 655 } 656 657 return max ? max - bus->number : 0; 658 } 659 660 /** 661 * pci_enable_sriov - enable the SR-IOV capability 662 * @dev: the PCI device 663 * @nr_virtfn: number of virtual functions to enable 664 * 665 * Returns 0 on success, or negative on failure. 666 */ 667 int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn) 668 { 669 might_sleep(); 670 671 if (!dev->is_physfn) 672 return -ENODEV; 673 674 return sriov_enable(dev, nr_virtfn); 675 } 676 EXPORT_SYMBOL_GPL(pci_enable_sriov); 677 678 /** 679 * pci_disable_sriov - disable the SR-IOV capability 680 * @dev: the PCI device 681 */ 682 void pci_disable_sriov(struct pci_dev *dev) 683 { 684 might_sleep(); 685 686 if (!dev->is_physfn) 687 return; 688 689 sriov_disable(dev); 690 } 691 EXPORT_SYMBOL_GPL(pci_disable_sriov); 692 693 /** 694 * pci_sriov_migration - notify SR-IOV core of Virtual Function Migration 695 * @dev: the PCI device 696 * 697 * Returns IRQ_HANDLED if the IRQ is handled, or IRQ_NONE if not. 698 * 699 * Physical Function driver is responsible to register IRQ handler using 700 * VF Migration Interrupt Message Number, and call this function when the 701 * interrupt is generated by the hardware. 702 */ 703 irqreturn_t pci_sriov_migration(struct pci_dev *dev) 704 { 705 if (!dev->is_physfn) 706 return IRQ_NONE; 707 708 return sriov_migration(dev) ? IRQ_HANDLED : IRQ_NONE; 709 } 710 EXPORT_SYMBOL_GPL(pci_sriov_migration); 711 712 /** 713 * pci_num_vf - return number of VFs associated with a PF device_release_driver 714 * @dev: the PCI device 715 * 716 * Returns number of VFs, or 0 if SR-IOV is not enabled. 717 */ 718 int pci_num_vf(struct pci_dev *dev) 719 { 720 if (!dev || !dev->is_physfn) 721 return 0; 722 else 723 return dev->sriov->nr_virtfn; 724 } 725 EXPORT_SYMBOL_GPL(pci_num_vf); 726