1 /* 2 * Copyright (C) 2012 Red Hat, Inc. All rights reserved. 3 * Author: Alex Williamson <alex.williamson@redhat.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Derived from original vfio: 10 * Copyright 2010 Cisco Systems, Inc. All rights reserved. 11 * Author: Tom Lyon, pugs@cisco.com 12 */ 13 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 15 16 #include <linux/device.h> 17 #include <linux/eventfd.h> 18 #include <linux/file.h> 19 #include <linux/interrupt.h> 20 #include <linux/iommu.h> 21 #include <linux/module.h> 22 #include <linux/mutex.h> 23 #include <linux/notifier.h> 24 #include <linux/pci.h> 25 #include <linux/pm_runtime.h> 26 #include <linux/slab.h> 27 #include <linux/types.h> 28 #include <linux/uaccess.h> 29 #include <linux/vfio.h> 30 #include <linux/vgaarb.h> 31 32 #include "vfio_pci_private.h" 33 34 #define DRIVER_VERSION "0.2" 35 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>" 36 #define DRIVER_DESC "VFIO PCI - User Level meta-driver" 37 38 static char ids[1024] __initdata; 39 module_param_string(ids, ids, sizeof(ids), 0); 40 MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified"); 41 42 static bool nointxmask; 43 module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR); 44 MODULE_PARM_DESC(nointxmask, 45 "Disable support for PCI 2.3 style INTx masking. If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag."); 46 47 #ifdef CONFIG_VFIO_PCI_VGA 48 static bool disable_vga; 49 module_param(disable_vga, bool, S_IRUGO); 50 MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci"); 51 #endif 52 53 static bool disable_idle_d3; 54 module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR); 55 MODULE_PARM_DESC(disable_idle_d3, 56 "Disable using the PCI D3 low power state for idle, unused devices"); 57 58 static DEFINE_MUTEX(driver_lock); 59 60 static inline bool vfio_vga_disabled(void) 61 { 62 #ifdef CONFIG_VFIO_PCI_VGA 63 return disable_vga; 64 #else 65 return true; 66 #endif 67 } 68 69 /* 70 * Our VGA arbiter participation is limited since we don't know anything 71 * about the device itself. However, if the device is the only VGA device 72 * downstream of a bridge and VFIO VGA support is disabled, then we can 73 * safely return legacy VGA IO and memory as not decoded since the user 74 * has no way to get to it and routing can be disabled externally at the 75 * bridge. 76 */ 77 static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga) 78 { 79 struct vfio_pci_device *vdev = opaque; 80 struct pci_dev *tmp = NULL, *pdev = vdev->pdev; 81 unsigned char max_busnr; 82 unsigned int decodes; 83 84 if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus)) 85 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | 86 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; 87 88 max_busnr = pci_bus_max_busnr(pdev->bus); 89 decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; 90 91 while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) { 92 if (tmp == pdev || 93 pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) || 94 pci_is_root_bus(tmp->bus)) 95 continue; 96 97 if (tmp->bus->number >= pdev->bus->number && 98 tmp->bus->number <= max_busnr) { 99 pci_dev_put(tmp); 100 decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; 101 break; 102 } 103 } 104 105 return decodes; 106 } 107 108 static inline bool vfio_pci_is_vga(struct pci_dev *pdev) 109 { 110 return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; 111 } 112 113 static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev) 114 { 115 struct resource *res; 116 int bar; 117 struct vfio_pci_dummy_resource *dummy_res; 118 119 INIT_LIST_HEAD(&vdev->dummy_resources_list); 120 121 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { 122 res = vdev->pdev->resource + bar; 123 124 if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP)) 125 goto no_mmap; 126 127 if (!(res->flags & IORESOURCE_MEM)) 128 goto no_mmap; 129 130 /* 131 * The PCI core shouldn't set up a resource with a 132 * type but zero size. But there may be bugs that 133 * cause us to do that. 134 */ 135 if (!resource_size(res)) 136 goto no_mmap; 137 138 if (resource_size(res) >= PAGE_SIZE) { 139 vdev->bar_mmap_supported[bar] = true; 140 continue; 141 } 142 143 if (!(res->start & ~PAGE_MASK)) { 144 /* 145 * Add a dummy resource to reserve the remainder 146 * of the exclusive page in case that hot-add 147 * device's bar is assigned into it. 148 */ 149 dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL); 150 if (dummy_res == NULL) 151 goto no_mmap; 152 153 dummy_res->resource.name = "vfio sub-page reserved"; 154 dummy_res->resource.start = res->end + 1; 155 dummy_res->resource.end = res->start + PAGE_SIZE - 1; 156 dummy_res->resource.flags = res->flags; 157 if (request_resource(res->parent, 158 &dummy_res->resource)) { 159 kfree(dummy_res); 160 goto no_mmap; 161 } 162 dummy_res->index = bar; 163 list_add(&dummy_res->res_next, 164 &vdev->dummy_resources_list); 165 vdev->bar_mmap_supported[bar] = true; 166 continue; 167 } 168 /* 169 * Here we don't handle the case when the BAR is not page 170 * aligned because we can't expect the BAR will be 171 * assigned into the same location in a page in guest 172 * when we passthrough the BAR. And it's hard to access 173 * this BAR in userspace because we have no way to get 174 * the BAR's location in a page. 175 */ 176 no_mmap: 177 vdev->bar_mmap_supported[bar] = false; 178 } 179 } 180 181 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev); 182 static void vfio_pci_disable(struct vfio_pci_device *vdev); 183 184 /* 185 * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND 186 * _and_ the ability detect when the device is asserting INTx via PCI_STATUS. 187 * If a device implements the former but not the latter we would typically 188 * expect broken_intx_masking be set and require an exclusive interrupt. 189 * However since we do have control of the device's ability to assert INTx, 190 * we can instead pretend that the device does not implement INTx, virtualizing 191 * the pin register to report zero and maintaining DisINTx set on the host. 192 */ 193 static bool vfio_pci_nointx(struct pci_dev *pdev) 194 { 195 switch (pdev->vendor) { 196 case PCI_VENDOR_ID_INTEL: 197 switch (pdev->device) { 198 /* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */ 199 case 0x1572: 200 case 0x1574: 201 case 0x1580 ... 0x1581: 202 case 0x1583 ... 0x158b: 203 case 0x37d0 ... 0x37d2: 204 return true; 205 default: 206 return false; 207 } 208 } 209 210 return false; 211 } 212 213 static int vfio_pci_enable(struct vfio_pci_device *vdev) 214 { 215 struct pci_dev *pdev = vdev->pdev; 216 int ret; 217 u16 cmd; 218 u8 msix_pos; 219 220 pci_set_power_state(pdev, PCI_D0); 221 222 /* Don't allow our initial saved state to include busmaster */ 223 pci_clear_master(pdev); 224 225 ret = pci_enable_device(pdev); 226 if (ret) 227 return ret; 228 229 /* If reset fails because of the device lock, fail this path entirely */ 230 ret = pci_try_reset_function(pdev); 231 if (ret == -EAGAIN) { 232 pci_disable_device(pdev); 233 return ret; 234 } 235 236 vdev->reset_works = !ret; 237 pci_save_state(pdev); 238 vdev->pci_saved_state = pci_store_saved_state(pdev); 239 if (!vdev->pci_saved_state) 240 pr_debug("%s: Couldn't store %s saved state\n", 241 __func__, dev_name(&pdev->dev)); 242 243 if (likely(!nointxmask)) { 244 if (vfio_pci_nointx(pdev)) { 245 dev_info(&pdev->dev, "Masking broken INTx support\n"); 246 vdev->nointx = true; 247 pci_intx(pdev, 0); 248 } else 249 vdev->pci_2_3 = pci_intx_mask_supported(pdev); 250 } 251 252 pci_read_config_word(pdev, PCI_COMMAND, &cmd); 253 if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) { 254 cmd &= ~PCI_COMMAND_INTX_DISABLE; 255 pci_write_config_word(pdev, PCI_COMMAND, cmd); 256 } 257 258 ret = vfio_config_init(vdev); 259 if (ret) { 260 kfree(vdev->pci_saved_state); 261 vdev->pci_saved_state = NULL; 262 pci_disable_device(pdev); 263 return ret; 264 } 265 266 msix_pos = pdev->msix_cap; 267 if (msix_pos) { 268 u16 flags; 269 u32 table; 270 271 pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags); 272 pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table); 273 274 vdev->msix_bar = table & PCI_MSIX_TABLE_BIR; 275 vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET; 276 vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16; 277 } else 278 vdev->msix_bar = 0xFF; 279 280 if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev)) 281 vdev->has_vga = true; 282 283 284 if (vfio_pci_is_vga(pdev) && 285 pdev->vendor == PCI_VENDOR_ID_INTEL && 286 IS_ENABLED(CONFIG_VFIO_PCI_IGD)) { 287 ret = vfio_pci_igd_init(vdev); 288 if (ret) { 289 dev_warn(&vdev->pdev->dev, 290 "Failed to setup Intel IGD regions\n"); 291 vfio_pci_disable(vdev); 292 return ret; 293 } 294 } 295 296 vfio_pci_probe_mmaps(vdev); 297 298 return 0; 299 } 300 301 static void vfio_pci_disable(struct vfio_pci_device *vdev) 302 { 303 struct pci_dev *pdev = vdev->pdev; 304 struct vfio_pci_dummy_resource *dummy_res, *tmp; 305 int i, bar; 306 307 /* Stop the device from further DMA */ 308 pci_clear_master(pdev); 309 310 vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE | 311 VFIO_IRQ_SET_ACTION_TRIGGER, 312 vdev->irq_type, 0, 0, NULL); 313 314 vdev->virq_disabled = false; 315 316 for (i = 0; i < vdev->num_regions; i++) 317 vdev->region[i].ops->release(vdev, &vdev->region[i]); 318 319 vdev->num_regions = 0; 320 kfree(vdev->region); 321 vdev->region = NULL; /* don't krealloc a freed pointer */ 322 323 vfio_config_free(vdev); 324 325 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { 326 if (!vdev->barmap[bar]) 327 continue; 328 pci_iounmap(pdev, vdev->barmap[bar]); 329 pci_release_selected_regions(pdev, 1 << bar); 330 vdev->barmap[bar] = NULL; 331 } 332 333 list_for_each_entry_safe(dummy_res, tmp, 334 &vdev->dummy_resources_list, res_next) { 335 list_del(&dummy_res->res_next); 336 release_resource(&dummy_res->resource); 337 kfree(dummy_res); 338 } 339 340 vdev->needs_reset = true; 341 342 /* 343 * If we have saved state, restore it. If we can reset the device, 344 * even better. Resetting with current state seems better than 345 * nothing, but saving and restoring current state without reset 346 * is just busy work. 347 */ 348 if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) { 349 pr_info("%s: Couldn't reload %s saved state\n", 350 __func__, dev_name(&pdev->dev)); 351 352 if (!vdev->reset_works) 353 goto out; 354 355 pci_save_state(pdev); 356 } 357 358 /* 359 * Disable INTx and MSI, presumably to avoid spurious interrupts 360 * during reset. Stolen from pci_reset_function() 361 */ 362 pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); 363 364 /* 365 * Try to reset the device. The success of this is dependent on 366 * being able to lock the device, which is not always possible. 367 */ 368 if (vdev->reset_works && !pci_try_reset_function(pdev)) 369 vdev->needs_reset = false; 370 371 pci_restore_state(pdev); 372 out: 373 pci_disable_device(pdev); 374 375 vfio_pci_try_bus_reset(vdev); 376 377 if (!disable_idle_d3) 378 pci_set_power_state(pdev, PCI_D3hot); 379 } 380 381 static void vfio_pci_release(void *device_data) 382 { 383 struct vfio_pci_device *vdev = device_data; 384 385 mutex_lock(&driver_lock); 386 387 if (!(--vdev->refcnt)) { 388 vfio_spapr_pci_eeh_release(vdev->pdev); 389 vfio_pci_disable(vdev); 390 } 391 392 mutex_unlock(&driver_lock); 393 394 module_put(THIS_MODULE); 395 } 396 397 static int vfio_pci_open(void *device_data) 398 { 399 struct vfio_pci_device *vdev = device_data; 400 int ret = 0; 401 402 if (!try_module_get(THIS_MODULE)) 403 return -ENODEV; 404 405 mutex_lock(&driver_lock); 406 407 if (!vdev->refcnt) { 408 ret = vfio_pci_enable(vdev); 409 if (ret) 410 goto error; 411 412 vfio_spapr_pci_eeh_open(vdev->pdev); 413 } 414 vdev->refcnt++; 415 error: 416 mutex_unlock(&driver_lock); 417 if (ret) 418 module_put(THIS_MODULE); 419 return ret; 420 } 421 422 static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type) 423 { 424 if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) { 425 u8 pin; 426 pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin); 427 if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && !vdev->nointx && pin) 428 return 1; 429 430 } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) { 431 u8 pos; 432 u16 flags; 433 434 pos = vdev->pdev->msi_cap; 435 if (pos) { 436 pci_read_config_word(vdev->pdev, 437 pos + PCI_MSI_FLAGS, &flags); 438 return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1); 439 } 440 } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) { 441 u8 pos; 442 u16 flags; 443 444 pos = vdev->pdev->msix_cap; 445 if (pos) { 446 pci_read_config_word(vdev->pdev, 447 pos + PCI_MSIX_FLAGS, &flags); 448 449 return (flags & PCI_MSIX_FLAGS_QSIZE) + 1; 450 } 451 } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) { 452 if (pci_is_pcie(vdev->pdev)) 453 return 1; 454 } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) { 455 return 1; 456 } 457 458 return 0; 459 } 460 461 static int vfio_pci_count_devs(struct pci_dev *pdev, void *data) 462 { 463 (*(int *)data)++; 464 return 0; 465 } 466 467 struct vfio_pci_fill_info { 468 int max; 469 int cur; 470 struct vfio_pci_dependent_device *devices; 471 }; 472 473 static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data) 474 { 475 struct vfio_pci_fill_info *fill = data; 476 struct iommu_group *iommu_group; 477 478 if (fill->cur == fill->max) 479 return -EAGAIN; /* Something changed, try again */ 480 481 iommu_group = iommu_group_get(&pdev->dev); 482 if (!iommu_group) 483 return -EPERM; /* Cannot reset non-isolated devices */ 484 485 fill->devices[fill->cur].group_id = iommu_group_id(iommu_group); 486 fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus); 487 fill->devices[fill->cur].bus = pdev->bus->number; 488 fill->devices[fill->cur].devfn = pdev->devfn; 489 fill->cur++; 490 iommu_group_put(iommu_group); 491 return 0; 492 } 493 494 struct vfio_pci_group_entry { 495 struct vfio_group *group; 496 int id; 497 }; 498 499 struct vfio_pci_group_info { 500 int count; 501 struct vfio_pci_group_entry *groups; 502 }; 503 504 static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data) 505 { 506 struct vfio_pci_group_info *info = data; 507 struct iommu_group *group; 508 int id, i; 509 510 group = iommu_group_get(&pdev->dev); 511 if (!group) 512 return -EPERM; 513 514 id = iommu_group_id(group); 515 516 for (i = 0; i < info->count; i++) 517 if (info->groups[i].id == id) 518 break; 519 520 iommu_group_put(group); 521 522 return (i == info->count) ? -EINVAL : 0; 523 } 524 525 static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot) 526 { 527 for (; pdev; pdev = pdev->bus->self) 528 if (pdev->bus == slot->bus) 529 return (pdev->slot == slot); 530 return false; 531 } 532 533 struct vfio_pci_walk_info { 534 int (*fn)(struct pci_dev *, void *data); 535 void *data; 536 struct pci_dev *pdev; 537 bool slot; 538 int ret; 539 }; 540 541 static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data) 542 { 543 struct vfio_pci_walk_info *walk = data; 544 545 if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot)) 546 walk->ret = walk->fn(pdev, walk->data); 547 548 return walk->ret; 549 } 550 551 static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev, 552 int (*fn)(struct pci_dev *, 553 void *data), void *data, 554 bool slot) 555 { 556 struct vfio_pci_walk_info walk = { 557 .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0, 558 }; 559 560 pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk); 561 562 return walk.ret; 563 } 564 565 static int msix_mmappable_cap(struct vfio_pci_device *vdev, 566 struct vfio_info_cap *caps) 567 { 568 struct vfio_info_cap_header header = { 569 .id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE, 570 .version = 1 571 }; 572 573 return vfio_info_add_capability(caps, &header, sizeof(header)); 574 } 575 576 int vfio_pci_register_dev_region(struct vfio_pci_device *vdev, 577 unsigned int type, unsigned int subtype, 578 const struct vfio_pci_regops *ops, 579 size_t size, u32 flags, void *data) 580 { 581 struct vfio_pci_region *region; 582 583 region = krealloc(vdev->region, 584 (vdev->num_regions + 1) * sizeof(*region), 585 GFP_KERNEL); 586 if (!region) 587 return -ENOMEM; 588 589 vdev->region = region; 590 vdev->region[vdev->num_regions].type = type; 591 vdev->region[vdev->num_regions].subtype = subtype; 592 vdev->region[vdev->num_regions].ops = ops; 593 vdev->region[vdev->num_regions].size = size; 594 vdev->region[vdev->num_regions].flags = flags; 595 vdev->region[vdev->num_regions].data = data; 596 597 vdev->num_regions++; 598 599 return 0; 600 } 601 602 static long vfio_pci_ioctl(void *device_data, 603 unsigned int cmd, unsigned long arg) 604 { 605 struct vfio_pci_device *vdev = device_data; 606 unsigned long minsz; 607 608 if (cmd == VFIO_DEVICE_GET_INFO) { 609 struct vfio_device_info info; 610 611 minsz = offsetofend(struct vfio_device_info, num_irqs); 612 613 if (copy_from_user(&info, (void __user *)arg, minsz)) 614 return -EFAULT; 615 616 if (info.argsz < minsz) 617 return -EINVAL; 618 619 info.flags = VFIO_DEVICE_FLAGS_PCI; 620 621 if (vdev->reset_works) 622 info.flags |= VFIO_DEVICE_FLAGS_RESET; 623 624 info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions; 625 info.num_irqs = VFIO_PCI_NUM_IRQS; 626 627 return copy_to_user((void __user *)arg, &info, minsz) ? 628 -EFAULT : 0; 629 630 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { 631 struct pci_dev *pdev = vdev->pdev; 632 struct vfio_region_info info; 633 struct vfio_info_cap caps = { .buf = NULL, .size = 0 }; 634 int i, ret; 635 636 minsz = offsetofend(struct vfio_region_info, offset); 637 638 if (copy_from_user(&info, (void __user *)arg, minsz)) 639 return -EFAULT; 640 641 if (info.argsz < minsz) 642 return -EINVAL; 643 644 switch (info.index) { 645 case VFIO_PCI_CONFIG_REGION_INDEX: 646 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 647 info.size = pdev->cfg_size; 648 info.flags = VFIO_REGION_INFO_FLAG_READ | 649 VFIO_REGION_INFO_FLAG_WRITE; 650 break; 651 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: 652 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 653 info.size = pci_resource_len(pdev, info.index); 654 if (!info.size) { 655 info.flags = 0; 656 break; 657 } 658 659 info.flags = VFIO_REGION_INFO_FLAG_READ | 660 VFIO_REGION_INFO_FLAG_WRITE; 661 if (vdev->bar_mmap_supported[info.index]) { 662 info.flags |= VFIO_REGION_INFO_FLAG_MMAP; 663 if (info.index == vdev->msix_bar) { 664 ret = msix_mmappable_cap(vdev, &caps); 665 if (ret) 666 return ret; 667 } 668 } 669 670 break; 671 case VFIO_PCI_ROM_REGION_INDEX: 672 { 673 void __iomem *io; 674 size_t size; 675 676 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 677 info.flags = 0; 678 679 /* Report the BAR size, not the ROM size */ 680 info.size = pci_resource_len(pdev, info.index); 681 if (!info.size) { 682 /* Shadow ROMs appear as PCI option ROMs */ 683 if (pdev->resource[PCI_ROM_RESOURCE].flags & 684 IORESOURCE_ROM_SHADOW) 685 info.size = 0x20000; 686 else 687 break; 688 } 689 690 /* Is it really there? */ 691 io = pci_map_rom(pdev, &size); 692 if (!io || !size) { 693 info.size = 0; 694 break; 695 } 696 pci_unmap_rom(pdev, io); 697 698 info.flags = VFIO_REGION_INFO_FLAG_READ; 699 break; 700 } 701 case VFIO_PCI_VGA_REGION_INDEX: 702 if (!vdev->has_vga) 703 return -EINVAL; 704 705 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 706 info.size = 0xc0000; 707 info.flags = VFIO_REGION_INFO_FLAG_READ | 708 VFIO_REGION_INFO_FLAG_WRITE; 709 710 break; 711 default: 712 { 713 struct vfio_region_info_cap_type cap_type = { 714 .header.id = VFIO_REGION_INFO_CAP_TYPE, 715 .header.version = 1 }; 716 717 if (info.index >= 718 VFIO_PCI_NUM_REGIONS + vdev->num_regions) 719 return -EINVAL; 720 721 i = info.index - VFIO_PCI_NUM_REGIONS; 722 723 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 724 info.size = vdev->region[i].size; 725 info.flags = vdev->region[i].flags; 726 727 cap_type.type = vdev->region[i].type; 728 cap_type.subtype = vdev->region[i].subtype; 729 730 ret = vfio_info_add_capability(&caps, &cap_type.header, 731 sizeof(cap_type)); 732 if (ret) 733 return ret; 734 735 } 736 } 737 738 if (caps.size) { 739 info.flags |= VFIO_REGION_INFO_FLAG_CAPS; 740 if (info.argsz < sizeof(info) + caps.size) { 741 info.argsz = sizeof(info) + caps.size; 742 info.cap_offset = 0; 743 } else { 744 vfio_info_cap_shift(&caps, sizeof(info)); 745 if (copy_to_user((void __user *)arg + 746 sizeof(info), caps.buf, 747 caps.size)) { 748 kfree(caps.buf); 749 return -EFAULT; 750 } 751 info.cap_offset = sizeof(info); 752 } 753 754 kfree(caps.buf); 755 } 756 757 return copy_to_user((void __user *)arg, &info, minsz) ? 758 -EFAULT : 0; 759 760 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { 761 struct vfio_irq_info info; 762 763 minsz = offsetofend(struct vfio_irq_info, count); 764 765 if (copy_from_user(&info, (void __user *)arg, minsz)) 766 return -EFAULT; 767 768 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS) 769 return -EINVAL; 770 771 switch (info.index) { 772 case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX: 773 case VFIO_PCI_REQ_IRQ_INDEX: 774 break; 775 case VFIO_PCI_ERR_IRQ_INDEX: 776 if (pci_is_pcie(vdev->pdev)) 777 break; 778 /* pass thru to return error */ 779 default: 780 return -EINVAL; 781 } 782 783 info.flags = VFIO_IRQ_INFO_EVENTFD; 784 785 info.count = vfio_pci_get_irq_count(vdev, info.index); 786 787 if (info.index == VFIO_PCI_INTX_IRQ_INDEX) 788 info.flags |= (VFIO_IRQ_INFO_MASKABLE | 789 VFIO_IRQ_INFO_AUTOMASKED); 790 else 791 info.flags |= VFIO_IRQ_INFO_NORESIZE; 792 793 return copy_to_user((void __user *)arg, &info, minsz) ? 794 -EFAULT : 0; 795 796 } else if (cmd == VFIO_DEVICE_SET_IRQS) { 797 struct vfio_irq_set hdr; 798 u8 *data = NULL; 799 int max, ret = 0; 800 size_t data_size = 0; 801 802 minsz = offsetofend(struct vfio_irq_set, count); 803 804 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 805 return -EFAULT; 806 807 max = vfio_pci_get_irq_count(vdev, hdr.index); 808 809 ret = vfio_set_irqs_validate_and_prepare(&hdr, max, 810 VFIO_PCI_NUM_IRQS, &data_size); 811 if (ret) 812 return ret; 813 814 if (data_size) { 815 data = memdup_user((void __user *)(arg + minsz), 816 data_size); 817 if (IS_ERR(data)) 818 return PTR_ERR(data); 819 } 820 821 mutex_lock(&vdev->igate); 822 823 ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index, 824 hdr.start, hdr.count, data); 825 826 mutex_unlock(&vdev->igate); 827 kfree(data); 828 829 return ret; 830 831 } else if (cmd == VFIO_DEVICE_RESET) { 832 return vdev->reset_works ? 833 pci_try_reset_function(vdev->pdev) : -EINVAL; 834 835 } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) { 836 struct vfio_pci_hot_reset_info hdr; 837 struct vfio_pci_fill_info fill = { 0 }; 838 struct vfio_pci_dependent_device *devices = NULL; 839 bool slot = false; 840 int ret = 0; 841 842 minsz = offsetofend(struct vfio_pci_hot_reset_info, count); 843 844 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 845 return -EFAULT; 846 847 if (hdr.argsz < minsz) 848 return -EINVAL; 849 850 hdr.flags = 0; 851 852 /* Can we do a slot or bus reset or neither? */ 853 if (!pci_probe_reset_slot(vdev->pdev->slot)) 854 slot = true; 855 else if (pci_probe_reset_bus(vdev->pdev->bus)) 856 return -ENODEV; 857 858 /* How many devices are affected? */ 859 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 860 vfio_pci_count_devs, 861 &fill.max, slot); 862 if (ret) 863 return ret; 864 865 WARN_ON(!fill.max); /* Should always be at least one */ 866 867 /* 868 * If there's enough space, fill it now, otherwise return 869 * -ENOSPC and the number of devices affected. 870 */ 871 if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) { 872 ret = -ENOSPC; 873 hdr.count = fill.max; 874 goto reset_info_exit; 875 } 876 877 devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL); 878 if (!devices) 879 return -ENOMEM; 880 881 fill.devices = devices; 882 883 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 884 vfio_pci_fill_devs, 885 &fill, slot); 886 887 /* 888 * If a device was removed between counting and filling, 889 * we may come up short of fill.max. If a device was 890 * added, we'll have a return of -EAGAIN above. 891 */ 892 if (!ret) 893 hdr.count = fill.cur; 894 895 reset_info_exit: 896 if (copy_to_user((void __user *)arg, &hdr, minsz)) 897 ret = -EFAULT; 898 899 if (!ret) { 900 if (copy_to_user((void __user *)(arg + minsz), devices, 901 hdr.count * sizeof(*devices))) 902 ret = -EFAULT; 903 } 904 905 kfree(devices); 906 return ret; 907 908 } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) { 909 struct vfio_pci_hot_reset hdr; 910 int32_t *group_fds; 911 struct vfio_pci_group_entry *groups; 912 struct vfio_pci_group_info info; 913 bool slot = false; 914 int i, count = 0, ret = 0; 915 916 minsz = offsetofend(struct vfio_pci_hot_reset, count); 917 918 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 919 return -EFAULT; 920 921 if (hdr.argsz < minsz || hdr.flags) 922 return -EINVAL; 923 924 /* Can we do a slot or bus reset or neither? */ 925 if (!pci_probe_reset_slot(vdev->pdev->slot)) 926 slot = true; 927 else if (pci_probe_reset_bus(vdev->pdev->bus)) 928 return -ENODEV; 929 930 /* 931 * We can't let userspace give us an arbitrarily large 932 * buffer to copy, so verify how many we think there 933 * could be. Note groups can have multiple devices so 934 * one group per device is the max. 935 */ 936 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 937 vfio_pci_count_devs, 938 &count, slot); 939 if (ret) 940 return ret; 941 942 /* Somewhere between 1 and count is OK */ 943 if (!hdr.count || hdr.count > count) 944 return -EINVAL; 945 946 group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL); 947 groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL); 948 if (!group_fds || !groups) { 949 kfree(group_fds); 950 kfree(groups); 951 return -ENOMEM; 952 } 953 954 if (copy_from_user(group_fds, (void __user *)(arg + minsz), 955 hdr.count * sizeof(*group_fds))) { 956 kfree(group_fds); 957 kfree(groups); 958 return -EFAULT; 959 } 960 961 /* 962 * For each group_fd, get the group through the vfio external 963 * user interface and store the group and iommu ID. This 964 * ensures the group is held across the reset. 965 */ 966 for (i = 0; i < hdr.count; i++) { 967 struct vfio_group *group; 968 struct fd f = fdget(group_fds[i]); 969 if (!f.file) { 970 ret = -EBADF; 971 break; 972 } 973 974 group = vfio_group_get_external_user(f.file); 975 fdput(f); 976 if (IS_ERR(group)) { 977 ret = PTR_ERR(group); 978 break; 979 } 980 981 groups[i].group = group; 982 groups[i].id = vfio_external_user_iommu_id(group); 983 } 984 985 kfree(group_fds); 986 987 /* release reference to groups on error */ 988 if (ret) 989 goto hot_reset_release; 990 991 info.count = hdr.count; 992 info.groups = groups; 993 994 /* 995 * Test whether all the affected devices are contained 996 * by the set of groups provided by the user. 997 */ 998 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 999 vfio_pci_validate_devs, 1000 &info, slot); 1001 if (!ret) 1002 /* User has access, do the reset */ 1003 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : 1004 pci_try_reset_bus(vdev->pdev->bus); 1005 1006 hot_reset_release: 1007 for (i--; i >= 0; i--) 1008 vfio_group_put_external_user(groups[i].group); 1009 1010 kfree(groups); 1011 return ret; 1012 } 1013 1014 return -ENOTTY; 1015 } 1016 1017 static ssize_t vfio_pci_rw(void *device_data, char __user *buf, 1018 size_t count, loff_t *ppos, bool iswrite) 1019 { 1020 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos); 1021 struct vfio_pci_device *vdev = device_data; 1022 1023 if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions) 1024 return -EINVAL; 1025 1026 switch (index) { 1027 case VFIO_PCI_CONFIG_REGION_INDEX: 1028 return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite); 1029 1030 case VFIO_PCI_ROM_REGION_INDEX: 1031 if (iswrite) 1032 return -EINVAL; 1033 return vfio_pci_bar_rw(vdev, buf, count, ppos, false); 1034 1035 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: 1036 return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite); 1037 1038 case VFIO_PCI_VGA_REGION_INDEX: 1039 return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite); 1040 default: 1041 index -= VFIO_PCI_NUM_REGIONS; 1042 return vdev->region[index].ops->rw(vdev, buf, 1043 count, ppos, iswrite); 1044 } 1045 1046 return -EINVAL; 1047 } 1048 1049 static ssize_t vfio_pci_read(void *device_data, char __user *buf, 1050 size_t count, loff_t *ppos) 1051 { 1052 if (!count) 1053 return 0; 1054 1055 return vfio_pci_rw(device_data, buf, count, ppos, false); 1056 } 1057 1058 static ssize_t vfio_pci_write(void *device_data, const char __user *buf, 1059 size_t count, loff_t *ppos) 1060 { 1061 if (!count) 1062 return 0; 1063 1064 return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true); 1065 } 1066 1067 static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma) 1068 { 1069 struct vfio_pci_device *vdev = device_data; 1070 struct pci_dev *pdev = vdev->pdev; 1071 unsigned int index; 1072 u64 phys_len, req_len, pgoff, req_start; 1073 int ret; 1074 1075 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); 1076 1077 if (vma->vm_end < vma->vm_start) 1078 return -EINVAL; 1079 if ((vma->vm_flags & VM_SHARED) == 0) 1080 return -EINVAL; 1081 if (index >= VFIO_PCI_ROM_REGION_INDEX) 1082 return -EINVAL; 1083 if (!vdev->bar_mmap_supported[index]) 1084 return -EINVAL; 1085 1086 phys_len = PAGE_ALIGN(pci_resource_len(pdev, index)); 1087 req_len = vma->vm_end - vma->vm_start; 1088 pgoff = vma->vm_pgoff & 1089 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1); 1090 req_start = pgoff << PAGE_SHIFT; 1091 1092 if (req_start + req_len > phys_len) 1093 return -EINVAL; 1094 1095 /* 1096 * Even though we don't make use of the barmap for the mmap, 1097 * we need to request the region and the barmap tracks that. 1098 */ 1099 if (!vdev->barmap[index]) { 1100 ret = pci_request_selected_regions(pdev, 1101 1 << index, "vfio-pci"); 1102 if (ret) 1103 return ret; 1104 1105 vdev->barmap[index] = pci_iomap(pdev, index, 0); 1106 if (!vdev->barmap[index]) { 1107 pci_release_selected_regions(pdev, 1 << index); 1108 return -ENOMEM; 1109 } 1110 } 1111 1112 vma->vm_private_data = vdev; 1113 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1114 vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff; 1115 1116 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, 1117 req_len, vma->vm_page_prot); 1118 } 1119 1120 static void vfio_pci_request(void *device_data, unsigned int count) 1121 { 1122 struct vfio_pci_device *vdev = device_data; 1123 1124 mutex_lock(&vdev->igate); 1125 1126 if (vdev->req_trigger) { 1127 if (!(count % 10)) 1128 dev_notice_ratelimited(&vdev->pdev->dev, 1129 "Relaying device request to user (#%u)\n", 1130 count); 1131 eventfd_signal(vdev->req_trigger, 1); 1132 } else if (count == 0) { 1133 dev_warn(&vdev->pdev->dev, 1134 "No device request channel registered, blocked until released by user\n"); 1135 } 1136 1137 mutex_unlock(&vdev->igate); 1138 } 1139 1140 static const struct vfio_device_ops vfio_pci_ops = { 1141 .name = "vfio-pci", 1142 .open = vfio_pci_open, 1143 .release = vfio_pci_release, 1144 .ioctl = vfio_pci_ioctl, 1145 .read = vfio_pci_read, 1146 .write = vfio_pci_write, 1147 .mmap = vfio_pci_mmap, 1148 .request = vfio_pci_request, 1149 }; 1150 1151 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 1152 { 1153 struct vfio_pci_device *vdev; 1154 struct iommu_group *group; 1155 int ret; 1156 1157 if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL) 1158 return -EINVAL; 1159 1160 group = vfio_iommu_group_get(&pdev->dev); 1161 if (!group) 1162 return -EINVAL; 1163 1164 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 1165 if (!vdev) { 1166 vfio_iommu_group_put(group, &pdev->dev); 1167 return -ENOMEM; 1168 } 1169 1170 vdev->pdev = pdev; 1171 vdev->irq_type = VFIO_PCI_NUM_IRQS; 1172 mutex_init(&vdev->igate); 1173 spin_lock_init(&vdev->irqlock); 1174 1175 ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev); 1176 if (ret) { 1177 vfio_iommu_group_put(group, &pdev->dev); 1178 kfree(vdev); 1179 return ret; 1180 } 1181 1182 if (vfio_pci_is_vga(pdev)) { 1183 vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode); 1184 vga_set_legacy_decoding(pdev, 1185 vfio_pci_set_vga_decode(vdev, false)); 1186 } 1187 1188 if (!disable_idle_d3) { 1189 /* 1190 * pci-core sets the device power state to an unknown value at 1191 * bootup and after being removed from a driver. The only 1192 * transition it allows from this unknown state is to D0, which 1193 * typically happens when a driver calls pci_enable_device(). 1194 * We're not ready to enable the device yet, but we do want to 1195 * be able to get to D3. Therefore first do a D0 transition 1196 * before going to D3. 1197 */ 1198 pci_set_power_state(pdev, PCI_D0); 1199 pci_set_power_state(pdev, PCI_D3hot); 1200 } 1201 1202 return ret; 1203 } 1204 1205 static void vfio_pci_remove(struct pci_dev *pdev) 1206 { 1207 struct vfio_pci_device *vdev; 1208 1209 vdev = vfio_del_group_dev(&pdev->dev); 1210 if (!vdev) 1211 return; 1212 1213 vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev); 1214 kfree(vdev->region); 1215 kfree(vdev); 1216 1217 if (vfio_pci_is_vga(pdev)) { 1218 vga_client_register(pdev, NULL, NULL, NULL); 1219 vga_set_legacy_decoding(pdev, 1220 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | 1221 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); 1222 } 1223 1224 if (!disable_idle_d3) 1225 pci_set_power_state(pdev, PCI_D0); 1226 } 1227 1228 static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev, 1229 pci_channel_state_t state) 1230 { 1231 struct vfio_pci_device *vdev; 1232 struct vfio_device *device; 1233 1234 device = vfio_device_get_from_dev(&pdev->dev); 1235 if (device == NULL) 1236 return PCI_ERS_RESULT_DISCONNECT; 1237 1238 vdev = vfio_device_data(device); 1239 if (vdev == NULL) { 1240 vfio_device_put(device); 1241 return PCI_ERS_RESULT_DISCONNECT; 1242 } 1243 1244 mutex_lock(&vdev->igate); 1245 1246 if (vdev->err_trigger) 1247 eventfd_signal(vdev->err_trigger, 1); 1248 1249 mutex_unlock(&vdev->igate); 1250 1251 vfio_device_put(device); 1252 1253 return PCI_ERS_RESULT_CAN_RECOVER; 1254 } 1255 1256 static const struct pci_error_handlers vfio_err_handlers = { 1257 .error_detected = vfio_pci_aer_err_detected, 1258 }; 1259 1260 static struct pci_driver vfio_pci_driver = { 1261 .name = "vfio-pci", 1262 .id_table = NULL, /* only dynamic ids */ 1263 .probe = vfio_pci_probe, 1264 .remove = vfio_pci_remove, 1265 .err_handler = &vfio_err_handlers, 1266 }; 1267 1268 struct vfio_devices { 1269 struct vfio_device **devices; 1270 int cur_index; 1271 int max_index; 1272 }; 1273 1274 static int vfio_pci_get_devs(struct pci_dev *pdev, void *data) 1275 { 1276 struct vfio_devices *devs = data; 1277 struct vfio_device *device; 1278 1279 if (devs->cur_index == devs->max_index) 1280 return -ENOSPC; 1281 1282 device = vfio_device_get_from_dev(&pdev->dev); 1283 if (!device) 1284 return -EINVAL; 1285 1286 if (pci_dev_driver(pdev) != &vfio_pci_driver) { 1287 vfio_device_put(device); 1288 return -EBUSY; 1289 } 1290 1291 devs->devices[devs->cur_index++] = device; 1292 return 0; 1293 } 1294 1295 /* 1296 * Attempt to do a bus/slot reset if there are devices affected by a reset for 1297 * this device that are needs_reset and all of the affected devices are unused 1298 * (!refcnt). Callers are required to hold driver_lock when calling this to 1299 * prevent device opens and concurrent bus reset attempts. We prevent device 1300 * unbinds by acquiring and holding a reference to the vfio_device. 1301 * 1302 * NB: vfio-core considers a group to be viable even if some devices are 1303 * bound to drivers like pci-stub or pcieport. Here we require all devices 1304 * to be bound to vfio_pci since that's the only way we can be sure they 1305 * stay put. 1306 */ 1307 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev) 1308 { 1309 struct vfio_devices devs = { .cur_index = 0 }; 1310 int i = 0, ret = -EINVAL; 1311 bool needs_reset = false, slot = false; 1312 struct vfio_pci_device *tmp; 1313 1314 if (!pci_probe_reset_slot(vdev->pdev->slot)) 1315 slot = true; 1316 else if (pci_probe_reset_bus(vdev->pdev->bus)) 1317 return; 1318 1319 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs, 1320 &i, slot) || !i) 1321 return; 1322 1323 devs.max_index = i; 1324 devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL); 1325 if (!devs.devices) 1326 return; 1327 1328 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, 1329 vfio_pci_get_devs, &devs, slot)) 1330 goto put_devs; 1331 1332 for (i = 0; i < devs.cur_index; i++) { 1333 tmp = vfio_device_data(devs.devices[i]); 1334 if (tmp->needs_reset) 1335 needs_reset = true; 1336 if (tmp->refcnt) 1337 goto put_devs; 1338 } 1339 1340 if (needs_reset) 1341 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : 1342 pci_try_reset_bus(vdev->pdev->bus); 1343 1344 put_devs: 1345 for (i = 0; i < devs.cur_index; i++) { 1346 tmp = vfio_device_data(devs.devices[i]); 1347 if (!ret) 1348 tmp->needs_reset = false; 1349 1350 if (!tmp->refcnt && !disable_idle_d3) 1351 pci_set_power_state(tmp->pdev, PCI_D3hot); 1352 1353 vfio_device_put(devs.devices[i]); 1354 } 1355 1356 kfree(devs.devices); 1357 } 1358 1359 static void __exit vfio_pci_cleanup(void) 1360 { 1361 pci_unregister_driver(&vfio_pci_driver); 1362 vfio_pci_uninit_perm_bits(); 1363 } 1364 1365 static void __init vfio_pci_fill_ids(void) 1366 { 1367 char *p, *id; 1368 int rc; 1369 1370 /* no ids passed actually */ 1371 if (ids[0] == '\0') 1372 return; 1373 1374 /* add ids specified in the module parameter */ 1375 p = ids; 1376 while ((id = strsep(&p, ","))) { 1377 unsigned int vendor, device, subvendor = PCI_ANY_ID, 1378 subdevice = PCI_ANY_ID, class = 0, class_mask = 0; 1379 int fields; 1380 1381 if (!strlen(id)) 1382 continue; 1383 1384 fields = sscanf(id, "%x:%x:%x:%x:%x:%x", 1385 &vendor, &device, &subvendor, &subdevice, 1386 &class, &class_mask); 1387 1388 if (fields < 2) { 1389 pr_warn("invalid id string \"%s\"\n", id); 1390 continue; 1391 } 1392 1393 rc = pci_add_dynid(&vfio_pci_driver, vendor, device, 1394 subvendor, subdevice, class, class_mask, 0); 1395 if (rc) 1396 pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n", 1397 vendor, device, subvendor, subdevice, 1398 class, class_mask, rc); 1399 else 1400 pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n", 1401 vendor, device, subvendor, subdevice, 1402 class, class_mask); 1403 } 1404 } 1405 1406 static int __init vfio_pci_init(void) 1407 { 1408 int ret; 1409 1410 /* Allocate shared config space permision data used by all devices */ 1411 ret = vfio_pci_init_perm_bits(); 1412 if (ret) 1413 return ret; 1414 1415 /* Register and scan for devices */ 1416 ret = pci_register_driver(&vfio_pci_driver); 1417 if (ret) 1418 goto out_driver; 1419 1420 vfio_pci_fill_ids(); 1421 1422 return 0; 1423 1424 out_driver: 1425 vfio_pci_uninit_perm_bits(); 1426 return ret; 1427 } 1428 1429 module_init(vfio_pci_init); 1430 module_exit(vfio_pci_cleanup); 1431 1432 MODULE_VERSION(DRIVER_VERSION); 1433 MODULE_LICENSE("GPL v2"); 1434 MODULE_AUTHOR(DRIVER_AUTHOR); 1435 MODULE_DESCRIPTION(DRIVER_DESC); 1436