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_try_bus_reset(struct vfio_pci_device *vdev); 114 static void vfio_pci_disable(struct vfio_pci_device *vdev); 115 116 /* 117 * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND 118 * _and_ the ability detect when the device is asserting INTx via PCI_STATUS. 119 * If a device implements the former but not the latter we would typically 120 * expect broken_intx_masking be set and require an exclusive interrupt. 121 * However since we do have control of the device's ability to assert INTx, 122 * we can instead pretend that the device does not implement INTx, virtualizing 123 * the pin register to report zero and maintaining DisINTx set on the host. 124 */ 125 static bool vfio_pci_nointx(struct pci_dev *pdev) 126 { 127 switch (pdev->vendor) { 128 case PCI_VENDOR_ID_INTEL: 129 switch (pdev->device) { 130 /* All i40e (XL710/X710) 10/20/40GbE NICs */ 131 case 0x1572: 132 case 0x1574: 133 case 0x1580 ... 0x1581: 134 case 0x1583 ... 0x1589: 135 case 0x37d0 ... 0x37d2: 136 return true; 137 default: 138 return false; 139 } 140 } 141 142 return false; 143 } 144 145 static int vfio_pci_enable(struct vfio_pci_device *vdev) 146 { 147 struct pci_dev *pdev = vdev->pdev; 148 int ret; 149 u16 cmd; 150 u8 msix_pos; 151 152 pci_set_power_state(pdev, PCI_D0); 153 154 /* Don't allow our initial saved state to include busmaster */ 155 pci_clear_master(pdev); 156 157 ret = pci_enable_device(pdev); 158 if (ret) 159 return ret; 160 161 vdev->reset_works = (pci_reset_function(pdev) == 0); 162 pci_save_state(pdev); 163 vdev->pci_saved_state = pci_store_saved_state(pdev); 164 if (!vdev->pci_saved_state) 165 pr_debug("%s: Couldn't store %s saved state\n", 166 __func__, dev_name(&pdev->dev)); 167 168 if (likely(!nointxmask)) { 169 if (vfio_pci_nointx(pdev)) { 170 dev_info(&pdev->dev, "Masking broken INTx support\n"); 171 vdev->nointx = true; 172 pci_intx(pdev, 0); 173 } else 174 vdev->pci_2_3 = pci_intx_mask_supported(pdev); 175 } 176 177 pci_read_config_word(pdev, PCI_COMMAND, &cmd); 178 if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) { 179 cmd &= ~PCI_COMMAND_INTX_DISABLE; 180 pci_write_config_word(pdev, PCI_COMMAND, cmd); 181 } 182 183 ret = vfio_config_init(vdev); 184 if (ret) { 185 kfree(vdev->pci_saved_state); 186 vdev->pci_saved_state = NULL; 187 pci_disable_device(pdev); 188 return ret; 189 } 190 191 msix_pos = pdev->msix_cap; 192 if (msix_pos) { 193 u16 flags; 194 u32 table; 195 196 pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags); 197 pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table); 198 199 vdev->msix_bar = table & PCI_MSIX_TABLE_BIR; 200 vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET; 201 vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16; 202 } else 203 vdev->msix_bar = 0xFF; 204 205 if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev)) 206 vdev->has_vga = true; 207 208 209 if (vfio_pci_is_vga(pdev) && 210 pdev->vendor == PCI_VENDOR_ID_INTEL && 211 IS_ENABLED(CONFIG_VFIO_PCI_IGD)) { 212 ret = vfio_pci_igd_init(vdev); 213 if (ret) { 214 dev_warn(&vdev->pdev->dev, 215 "Failed to setup Intel IGD regions\n"); 216 vfio_pci_disable(vdev); 217 return ret; 218 } 219 } 220 221 return 0; 222 } 223 224 static void vfio_pci_disable(struct vfio_pci_device *vdev) 225 { 226 struct pci_dev *pdev = vdev->pdev; 227 int i, bar; 228 229 /* Stop the device from further DMA */ 230 pci_clear_master(pdev); 231 232 vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE | 233 VFIO_IRQ_SET_ACTION_TRIGGER, 234 vdev->irq_type, 0, 0, NULL); 235 236 vdev->virq_disabled = false; 237 238 for (i = 0; i < vdev->num_regions; i++) 239 vdev->region[i].ops->release(vdev, &vdev->region[i]); 240 241 vdev->num_regions = 0; 242 kfree(vdev->region); 243 vdev->region = NULL; /* don't krealloc a freed pointer */ 244 245 vfio_config_free(vdev); 246 247 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { 248 if (!vdev->barmap[bar]) 249 continue; 250 pci_iounmap(pdev, vdev->barmap[bar]); 251 pci_release_selected_regions(pdev, 1 << bar); 252 vdev->barmap[bar] = NULL; 253 } 254 255 vdev->needs_reset = true; 256 257 /* 258 * If we have saved state, restore it. If we can reset the device, 259 * even better. Resetting with current state seems better than 260 * nothing, but saving and restoring current state without reset 261 * is just busy work. 262 */ 263 if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) { 264 pr_info("%s: Couldn't reload %s saved state\n", 265 __func__, dev_name(&pdev->dev)); 266 267 if (!vdev->reset_works) 268 goto out; 269 270 pci_save_state(pdev); 271 } 272 273 /* 274 * Disable INTx and MSI, presumably to avoid spurious interrupts 275 * during reset. Stolen from pci_reset_function() 276 */ 277 pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); 278 279 /* 280 * Try to reset the device. The success of this is dependent on 281 * being able to lock the device, which is not always possible. 282 */ 283 if (vdev->reset_works && !pci_try_reset_function(pdev)) 284 vdev->needs_reset = false; 285 286 pci_restore_state(pdev); 287 out: 288 pci_disable_device(pdev); 289 290 vfio_pci_try_bus_reset(vdev); 291 292 if (!disable_idle_d3) 293 pci_set_power_state(pdev, PCI_D3hot); 294 } 295 296 static void vfio_pci_release(void *device_data) 297 { 298 struct vfio_pci_device *vdev = device_data; 299 300 mutex_lock(&driver_lock); 301 302 if (!(--vdev->refcnt)) { 303 vfio_spapr_pci_eeh_release(vdev->pdev); 304 vfio_pci_disable(vdev); 305 } 306 307 mutex_unlock(&driver_lock); 308 309 module_put(THIS_MODULE); 310 } 311 312 static int vfio_pci_open(void *device_data) 313 { 314 struct vfio_pci_device *vdev = device_data; 315 int ret = 0; 316 317 if (!try_module_get(THIS_MODULE)) 318 return -ENODEV; 319 320 mutex_lock(&driver_lock); 321 322 if (!vdev->refcnt) { 323 ret = vfio_pci_enable(vdev); 324 if (ret) 325 goto error; 326 327 vfio_spapr_pci_eeh_open(vdev->pdev); 328 } 329 vdev->refcnt++; 330 error: 331 mutex_unlock(&driver_lock); 332 if (ret) 333 module_put(THIS_MODULE); 334 return ret; 335 } 336 337 static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type) 338 { 339 if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) { 340 u8 pin; 341 pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin); 342 if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && !vdev->nointx && pin) 343 return 1; 344 345 } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) { 346 u8 pos; 347 u16 flags; 348 349 pos = vdev->pdev->msi_cap; 350 if (pos) { 351 pci_read_config_word(vdev->pdev, 352 pos + PCI_MSI_FLAGS, &flags); 353 return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1); 354 } 355 } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) { 356 u8 pos; 357 u16 flags; 358 359 pos = vdev->pdev->msix_cap; 360 if (pos) { 361 pci_read_config_word(vdev->pdev, 362 pos + PCI_MSIX_FLAGS, &flags); 363 364 return (flags & PCI_MSIX_FLAGS_QSIZE) + 1; 365 } 366 } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) { 367 if (pci_is_pcie(vdev->pdev)) 368 return 1; 369 } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) { 370 return 1; 371 } 372 373 return 0; 374 } 375 376 static int vfio_pci_count_devs(struct pci_dev *pdev, void *data) 377 { 378 (*(int *)data)++; 379 return 0; 380 } 381 382 struct vfio_pci_fill_info { 383 int max; 384 int cur; 385 struct vfio_pci_dependent_device *devices; 386 }; 387 388 static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data) 389 { 390 struct vfio_pci_fill_info *fill = data; 391 struct iommu_group *iommu_group; 392 393 if (fill->cur == fill->max) 394 return -EAGAIN; /* Something changed, try again */ 395 396 iommu_group = iommu_group_get(&pdev->dev); 397 if (!iommu_group) 398 return -EPERM; /* Cannot reset non-isolated devices */ 399 400 fill->devices[fill->cur].group_id = iommu_group_id(iommu_group); 401 fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus); 402 fill->devices[fill->cur].bus = pdev->bus->number; 403 fill->devices[fill->cur].devfn = pdev->devfn; 404 fill->cur++; 405 iommu_group_put(iommu_group); 406 return 0; 407 } 408 409 struct vfio_pci_group_entry { 410 struct vfio_group *group; 411 int id; 412 }; 413 414 struct vfio_pci_group_info { 415 int count; 416 struct vfio_pci_group_entry *groups; 417 }; 418 419 static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data) 420 { 421 struct vfio_pci_group_info *info = data; 422 struct iommu_group *group; 423 int id, i; 424 425 group = iommu_group_get(&pdev->dev); 426 if (!group) 427 return -EPERM; 428 429 id = iommu_group_id(group); 430 431 for (i = 0; i < info->count; i++) 432 if (info->groups[i].id == id) 433 break; 434 435 iommu_group_put(group); 436 437 return (i == info->count) ? -EINVAL : 0; 438 } 439 440 static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot) 441 { 442 for (; pdev; pdev = pdev->bus->self) 443 if (pdev->bus == slot->bus) 444 return (pdev->slot == slot); 445 return false; 446 } 447 448 struct vfio_pci_walk_info { 449 int (*fn)(struct pci_dev *, void *data); 450 void *data; 451 struct pci_dev *pdev; 452 bool slot; 453 int ret; 454 }; 455 456 static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data) 457 { 458 struct vfio_pci_walk_info *walk = data; 459 460 if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot)) 461 walk->ret = walk->fn(pdev, walk->data); 462 463 return walk->ret; 464 } 465 466 static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev, 467 int (*fn)(struct pci_dev *, 468 void *data), void *data, 469 bool slot) 470 { 471 struct vfio_pci_walk_info walk = { 472 .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0, 473 }; 474 475 pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk); 476 477 return walk.ret; 478 } 479 480 static int msix_sparse_mmap_cap(struct vfio_pci_device *vdev, 481 struct vfio_info_cap *caps) 482 { 483 struct vfio_info_cap_header *header; 484 struct vfio_region_info_cap_sparse_mmap *sparse; 485 size_t end, size; 486 int nr_areas = 2, i = 0; 487 488 end = pci_resource_len(vdev->pdev, vdev->msix_bar); 489 490 /* If MSI-X table is aligned to the start or end, only one area */ 491 if (((vdev->msix_offset & PAGE_MASK) == 0) || 492 (PAGE_ALIGN(vdev->msix_offset + vdev->msix_size) >= end)) 493 nr_areas = 1; 494 495 size = sizeof(*sparse) + (nr_areas * sizeof(*sparse->areas)); 496 497 header = vfio_info_cap_add(caps, size, 498 VFIO_REGION_INFO_CAP_SPARSE_MMAP, 1); 499 if (IS_ERR(header)) 500 return PTR_ERR(header); 501 502 sparse = container_of(header, 503 struct vfio_region_info_cap_sparse_mmap, header); 504 sparse->nr_areas = nr_areas; 505 506 if (vdev->msix_offset & PAGE_MASK) { 507 sparse->areas[i].offset = 0; 508 sparse->areas[i].size = vdev->msix_offset & PAGE_MASK; 509 i++; 510 } 511 512 if (PAGE_ALIGN(vdev->msix_offset + vdev->msix_size) < end) { 513 sparse->areas[i].offset = PAGE_ALIGN(vdev->msix_offset + 514 vdev->msix_size); 515 sparse->areas[i].size = end - sparse->areas[i].offset; 516 i++; 517 } 518 519 return 0; 520 } 521 522 static int region_type_cap(struct vfio_pci_device *vdev, 523 struct vfio_info_cap *caps, 524 unsigned int type, unsigned int subtype) 525 { 526 struct vfio_info_cap_header *header; 527 struct vfio_region_info_cap_type *cap; 528 529 header = vfio_info_cap_add(caps, sizeof(*cap), 530 VFIO_REGION_INFO_CAP_TYPE, 1); 531 if (IS_ERR(header)) 532 return PTR_ERR(header); 533 534 cap = container_of(header, struct vfio_region_info_cap_type, header); 535 cap->type = type; 536 cap->subtype = subtype; 537 538 return 0; 539 } 540 541 int vfio_pci_register_dev_region(struct vfio_pci_device *vdev, 542 unsigned int type, unsigned int subtype, 543 const struct vfio_pci_regops *ops, 544 size_t size, u32 flags, void *data) 545 { 546 struct vfio_pci_region *region; 547 548 region = krealloc(vdev->region, 549 (vdev->num_regions + 1) * sizeof(*region), 550 GFP_KERNEL); 551 if (!region) 552 return -ENOMEM; 553 554 vdev->region = region; 555 vdev->region[vdev->num_regions].type = type; 556 vdev->region[vdev->num_regions].subtype = subtype; 557 vdev->region[vdev->num_regions].ops = ops; 558 vdev->region[vdev->num_regions].size = size; 559 vdev->region[vdev->num_regions].flags = flags; 560 vdev->region[vdev->num_regions].data = data; 561 562 vdev->num_regions++; 563 564 return 0; 565 } 566 567 static long vfio_pci_ioctl(void *device_data, 568 unsigned int cmd, unsigned long arg) 569 { 570 struct vfio_pci_device *vdev = device_data; 571 unsigned long minsz; 572 573 if (cmd == VFIO_DEVICE_GET_INFO) { 574 struct vfio_device_info info; 575 576 minsz = offsetofend(struct vfio_device_info, num_irqs); 577 578 if (copy_from_user(&info, (void __user *)arg, minsz)) 579 return -EFAULT; 580 581 if (info.argsz < minsz) 582 return -EINVAL; 583 584 info.flags = VFIO_DEVICE_FLAGS_PCI; 585 586 if (vdev->reset_works) 587 info.flags |= VFIO_DEVICE_FLAGS_RESET; 588 589 info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions; 590 info.num_irqs = VFIO_PCI_NUM_IRQS; 591 592 return copy_to_user((void __user *)arg, &info, minsz) ? 593 -EFAULT : 0; 594 595 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { 596 struct pci_dev *pdev = vdev->pdev; 597 struct vfio_region_info info; 598 struct vfio_info_cap caps = { .buf = NULL, .size = 0 }; 599 int i, ret; 600 601 minsz = offsetofend(struct vfio_region_info, offset); 602 603 if (copy_from_user(&info, (void __user *)arg, minsz)) 604 return -EFAULT; 605 606 if (info.argsz < minsz) 607 return -EINVAL; 608 609 switch (info.index) { 610 case VFIO_PCI_CONFIG_REGION_INDEX: 611 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 612 info.size = pdev->cfg_size; 613 info.flags = VFIO_REGION_INFO_FLAG_READ | 614 VFIO_REGION_INFO_FLAG_WRITE; 615 break; 616 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: 617 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 618 info.size = pci_resource_len(pdev, info.index); 619 if (!info.size) { 620 info.flags = 0; 621 break; 622 } 623 624 info.flags = VFIO_REGION_INFO_FLAG_READ | 625 VFIO_REGION_INFO_FLAG_WRITE; 626 if (IS_ENABLED(CONFIG_VFIO_PCI_MMAP) && 627 pci_resource_flags(pdev, info.index) & 628 IORESOURCE_MEM && info.size >= PAGE_SIZE) { 629 info.flags |= VFIO_REGION_INFO_FLAG_MMAP; 630 if (info.index == vdev->msix_bar) { 631 ret = msix_sparse_mmap_cap(vdev, &caps); 632 if (ret) 633 return ret; 634 } 635 } 636 637 break; 638 case VFIO_PCI_ROM_REGION_INDEX: 639 { 640 void __iomem *io; 641 size_t size; 642 643 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 644 info.flags = 0; 645 646 /* Report the BAR size, not the ROM size */ 647 info.size = pci_resource_len(pdev, info.index); 648 if (!info.size) { 649 /* Shadow ROMs appear as PCI option ROMs */ 650 if (pdev->resource[PCI_ROM_RESOURCE].flags & 651 IORESOURCE_ROM_SHADOW) 652 info.size = 0x20000; 653 else 654 break; 655 } 656 657 /* Is it really there? */ 658 io = pci_map_rom(pdev, &size); 659 if (!io || !size) { 660 info.size = 0; 661 break; 662 } 663 pci_unmap_rom(pdev, io); 664 665 info.flags = VFIO_REGION_INFO_FLAG_READ; 666 break; 667 } 668 case VFIO_PCI_VGA_REGION_INDEX: 669 if (!vdev->has_vga) 670 return -EINVAL; 671 672 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 673 info.size = 0xc0000; 674 info.flags = VFIO_REGION_INFO_FLAG_READ | 675 VFIO_REGION_INFO_FLAG_WRITE; 676 677 break; 678 default: 679 if (info.index >= 680 VFIO_PCI_NUM_REGIONS + vdev->num_regions) 681 return -EINVAL; 682 683 i = info.index - VFIO_PCI_NUM_REGIONS; 684 685 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 686 info.size = vdev->region[i].size; 687 info.flags = vdev->region[i].flags; 688 689 ret = region_type_cap(vdev, &caps, 690 vdev->region[i].type, 691 vdev->region[i].subtype); 692 if (ret) 693 return ret; 694 } 695 696 if (caps.size) { 697 info.flags |= VFIO_REGION_INFO_FLAG_CAPS; 698 if (info.argsz < sizeof(info) + caps.size) { 699 info.argsz = sizeof(info) + caps.size; 700 info.cap_offset = 0; 701 } else { 702 vfio_info_cap_shift(&caps, sizeof(info)); 703 if (copy_to_user((void __user *)arg + 704 sizeof(info), caps.buf, 705 caps.size)) { 706 kfree(caps.buf); 707 return -EFAULT; 708 } 709 info.cap_offset = sizeof(info); 710 } 711 712 kfree(caps.buf); 713 } 714 715 return copy_to_user((void __user *)arg, &info, minsz) ? 716 -EFAULT : 0; 717 718 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { 719 struct vfio_irq_info info; 720 721 minsz = offsetofend(struct vfio_irq_info, count); 722 723 if (copy_from_user(&info, (void __user *)arg, minsz)) 724 return -EFAULT; 725 726 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS) 727 return -EINVAL; 728 729 switch (info.index) { 730 case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX: 731 case VFIO_PCI_REQ_IRQ_INDEX: 732 break; 733 case VFIO_PCI_ERR_IRQ_INDEX: 734 if (pci_is_pcie(vdev->pdev)) 735 break; 736 /* pass thru to return error */ 737 default: 738 return -EINVAL; 739 } 740 741 info.flags = VFIO_IRQ_INFO_EVENTFD; 742 743 info.count = vfio_pci_get_irq_count(vdev, info.index); 744 745 if (info.index == VFIO_PCI_INTX_IRQ_INDEX) 746 info.flags |= (VFIO_IRQ_INFO_MASKABLE | 747 VFIO_IRQ_INFO_AUTOMASKED); 748 else 749 info.flags |= VFIO_IRQ_INFO_NORESIZE; 750 751 return copy_to_user((void __user *)arg, &info, minsz) ? 752 -EFAULT : 0; 753 754 } else if (cmd == VFIO_DEVICE_SET_IRQS) { 755 struct vfio_irq_set hdr; 756 u8 *data = NULL; 757 int ret = 0; 758 759 minsz = offsetofend(struct vfio_irq_set, count); 760 761 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 762 return -EFAULT; 763 764 if (hdr.argsz < minsz || hdr.index >= VFIO_PCI_NUM_IRQS || 765 hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK | 766 VFIO_IRQ_SET_ACTION_TYPE_MASK)) 767 return -EINVAL; 768 769 if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) { 770 size_t size; 771 int max = vfio_pci_get_irq_count(vdev, hdr.index); 772 773 if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL) 774 size = sizeof(uint8_t); 775 else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD) 776 size = sizeof(int32_t); 777 else 778 return -EINVAL; 779 780 if (hdr.argsz - minsz < hdr.count * size || 781 hdr.start >= max || hdr.start + hdr.count > max) 782 return -EINVAL; 783 784 data = memdup_user((void __user *)(arg + minsz), 785 hdr.count * size); 786 if (IS_ERR(data)) 787 return PTR_ERR(data); 788 } 789 790 mutex_lock(&vdev->igate); 791 792 ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index, 793 hdr.start, hdr.count, data); 794 795 mutex_unlock(&vdev->igate); 796 kfree(data); 797 798 return ret; 799 800 } else if (cmd == VFIO_DEVICE_RESET) { 801 return vdev->reset_works ? 802 pci_try_reset_function(vdev->pdev) : -EINVAL; 803 804 } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) { 805 struct vfio_pci_hot_reset_info hdr; 806 struct vfio_pci_fill_info fill = { 0 }; 807 struct vfio_pci_dependent_device *devices = NULL; 808 bool slot = false; 809 int ret = 0; 810 811 minsz = offsetofend(struct vfio_pci_hot_reset_info, count); 812 813 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 814 return -EFAULT; 815 816 if (hdr.argsz < minsz) 817 return -EINVAL; 818 819 hdr.flags = 0; 820 821 /* Can we do a slot or bus reset or neither? */ 822 if (!pci_probe_reset_slot(vdev->pdev->slot)) 823 slot = true; 824 else if (pci_probe_reset_bus(vdev->pdev->bus)) 825 return -ENODEV; 826 827 /* How many devices are affected? */ 828 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 829 vfio_pci_count_devs, 830 &fill.max, slot); 831 if (ret) 832 return ret; 833 834 WARN_ON(!fill.max); /* Should always be at least one */ 835 836 /* 837 * If there's enough space, fill it now, otherwise return 838 * -ENOSPC and the number of devices affected. 839 */ 840 if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) { 841 ret = -ENOSPC; 842 hdr.count = fill.max; 843 goto reset_info_exit; 844 } 845 846 devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL); 847 if (!devices) 848 return -ENOMEM; 849 850 fill.devices = devices; 851 852 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 853 vfio_pci_fill_devs, 854 &fill, slot); 855 856 /* 857 * If a device was removed between counting and filling, 858 * we may come up short of fill.max. If a device was 859 * added, we'll have a return of -EAGAIN above. 860 */ 861 if (!ret) 862 hdr.count = fill.cur; 863 864 reset_info_exit: 865 if (copy_to_user((void __user *)arg, &hdr, minsz)) 866 ret = -EFAULT; 867 868 if (!ret) { 869 if (copy_to_user((void __user *)(arg + minsz), devices, 870 hdr.count * sizeof(*devices))) 871 ret = -EFAULT; 872 } 873 874 kfree(devices); 875 return ret; 876 877 } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) { 878 struct vfio_pci_hot_reset hdr; 879 int32_t *group_fds; 880 struct vfio_pci_group_entry *groups; 881 struct vfio_pci_group_info info; 882 bool slot = false; 883 int i, count = 0, ret = 0; 884 885 minsz = offsetofend(struct vfio_pci_hot_reset, count); 886 887 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 888 return -EFAULT; 889 890 if (hdr.argsz < minsz || hdr.flags) 891 return -EINVAL; 892 893 /* Can we do a slot or bus reset or neither? */ 894 if (!pci_probe_reset_slot(vdev->pdev->slot)) 895 slot = true; 896 else if (pci_probe_reset_bus(vdev->pdev->bus)) 897 return -ENODEV; 898 899 /* 900 * We can't let userspace give us an arbitrarily large 901 * buffer to copy, so verify how many we think there 902 * could be. Note groups can have multiple devices so 903 * one group per device is the max. 904 */ 905 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 906 vfio_pci_count_devs, 907 &count, slot); 908 if (ret) 909 return ret; 910 911 /* Somewhere between 1 and count is OK */ 912 if (!hdr.count || hdr.count > count) 913 return -EINVAL; 914 915 group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL); 916 groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL); 917 if (!group_fds || !groups) { 918 kfree(group_fds); 919 kfree(groups); 920 return -ENOMEM; 921 } 922 923 if (copy_from_user(group_fds, (void __user *)(arg + minsz), 924 hdr.count * sizeof(*group_fds))) { 925 kfree(group_fds); 926 kfree(groups); 927 return -EFAULT; 928 } 929 930 /* 931 * For each group_fd, get the group through the vfio external 932 * user interface and store the group and iommu ID. This 933 * ensures the group is held across the reset. 934 */ 935 for (i = 0; i < hdr.count; i++) { 936 struct vfio_group *group; 937 struct fd f = fdget(group_fds[i]); 938 if (!f.file) { 939 ret = -EBADF; 940 break; 941 } 942 943 group = vfio_group_get_external_user(f.file); 944 fdput(f); 945 if (IS_ERR(group)) { 946 ret = PTR_ERR(group); 947 break; 948 } 949 950 groups[i].group = group; 951 groups[i].id = vfio_external_user_iommu_id(group); 952 } 953 954 kfree(group_fds); 955 956 /* release reference to groups on error */ 957 if (ret) 958 goto hot_reset_release; 959 960 info.count = hdr.count; 961 info.groups = groups; 962 963 /* 964 * Test whether all the affected devices are contained 965 * by the set of groups provided by the user. 966 */ 967 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 968 vfio_pci_validate_devs, 969 &info, slot); 970 if (!ret) 971 /* User has access, do the reset */ 972 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : 973 pci_try_reset_bus(vdev->pdev->bus); 974 975 hot_reset_release: 976 for (i--; i >= 0; i--) 977 vfio_group_put_external_user(groups[i].group); 978 979 kfree(groups); 980 return ret; 981 } 982 983 return -ENOTTY; 984 } 985 986 static ssize_t vfio_pci_rw(void *device_data, char __user *buf, 987 size_t count, loff_t *ppos, bool iswrite) 988 { 989 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos); 990 struct vfio_pci_device *vdev = device_data; 991 992 if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions) 993 return -EINVAL; 994 995 switch (index) { 996 case VFIO_PCI_CONFIG_REGION_INDEX: 997 return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite); 998 999 case VFIO_PCI_ROM_REGION_INDEX: 1000 if (iswrite) 1001 return -EINVAL; 1002 return vfio_pci_bar_rw(vdev, buf, count, ppos, false); 1003 1004 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: 1005 return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite); 1006 1007 case VFIO_PCI_VGA_REGION_INDEX: 1008 return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite); 1009 default: 1010 index -= VFIO_PCI_NUM_REGIONS; 1011 return vdev->region[index].ops->rw(vdev, buf, 1012 count, ppos, iswrite); 1013 } 1014 1015 return -EINVAL; 1016 } 1017 1018 static ssize_t vfio_pci_read(void *device_data, char __user *buf, 1019 size_t count, loff_t *ppos) 1020 { 1021 if (!count) 1022 return 0; 1023 1024 return vfio_pci_rw(device_data, buf, count, ppos, false); 1025 } 1026 1027 static ssize_t vfio_pci_write(void *device_data, const char __user *buf, 1028 size_t count, loff_t *ppos) 1029 { 1030 if (!count) 1031 return 0; 1032 1033 return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true); 1034 } 1035 1036 static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma) 1037 { 1038 struct vfio_pci_device *vdev = device_data; 1039 struct pci_dev *pdev = vdev->pdev; 1040 unsigned int index; 1041 u64 phys_len, req_len, pgoff, req_start; 1042 int ret; 1043 1044 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); 1045 1046 if (vma->vm_end < vma->vm_start) 1047 return -EINVAL; 1048 if ((vma->vm_flags & VM_SHARED) == 0) 1049 return -EINVAL; 1050 if (index >= VFIO_PCI_ROM_REGION_INDEX) 1051 return -EINVAL; 1052 if (!(pci_resource_flags(pdev, index) & IORESOURCE_MEM)) 1053 return -EINVAL; 1054 1055 phys_len = pci_resource_len(pdev, index); 1056 req_len = vma->vm_end - vma->vm_start; 1057 pgoff = vma->vm_pgoff & 1058 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1); 1059 req_start = pgoff << PAGE_SHIFT; 1060 1061 if (phys_len < PAGE_SIZE || req_start + req_len > phys_len) 1062 return -EINVAL; 1063 1064 if (index == vdev->msix_bar) { 1065 /* 1066 * Disallow mmaps overlapping the MSI-X table; users don't 1067 * get to touch this directly. We could find somewhere 1068 * else to map the overlap, but page granularity is only 1069 * a recommendation, not a requirement, so the user needs 1070 * to know which bits are real. Requiring them to mmap 1071 * around the table makes that clear. 1072 */ 1073 1074 /* If neither entirely above nor below, then it overlaps */ 1075 if (!(req_start >= vdev->msix_offset + vdev->msix_size || 1076 req_start + req_len <= vdev->msix_offset)) 1077 return -EINVAL; 1078 } 1079 1080 /* 1081 * Even though we don't make use of the barmap for the mmap, 1082 * we need to request the region and the barmap tracks that. 1083 */ 1084 if (!vdev->barmap[index]) { 1085 ret = pci_request_selected_regions(pdev, 1086 1 << index, "vfio-pci"); 1087 if (ret) 1088 return ret; 1089 1090 vdev->barmap[index] = pci_iomap(pdev, index, 0); 1091 } 1092 1093 vma->vm_private_data = vdev; 1094 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1095 vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff; 1096 1097 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, 1098 req_len, vma->vm_page_prot); 1099 } 1100 1101 static void vfio_pci_request(void *device_data, unsigned int count) 1102 { 1103 struct vfio_pci_device *vdev = device_data; 1104 1105 mutex_lock(&vdev->igate); 1106 1107 if (vdev->req_trigger) { 1108 if (!(count % 10)) 1109 dev_notice_ratelimited(&vdev->pdev->dev, 1110 "Relaying device request to user (#%u)\n", 1111 count); 1112 eventfd_signal(vdev->req_trigger, 1); 1113 } else if (count == 0) { 1114 dev_warn(&vdev->pdev->dev, 1115 "No device request channel registered, blocked until released by user\n"); 1116 } 1117 1118 mutex_unlock(&vdev->igate); 1119 } 1120 1121 static const struct vfio_device_ops vfio_pci_ops = { 1122 .name = "vfio-pci", 1123 .open = vfio_pci_open, 1124 .release = vfio_pci_release, 1125 .ioctl = vfio_pci_ioctl, 1126 .read = vfio_pci_read, 1127 .write = vfio_pci_write, 1128 .mmap = vfio_pci_mmap, 1129 .request = vfio_pci_request, 1130 }; 1131 1132 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 1133 { 1134 struct vfio_pci_device *vdev; 1135 struct iommu_group *group; 1136 int ret; 1137 1138 if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL) 1139 return -EINVAL; 1140 1141 group = vfio_iommu_group_get(&pdev->dev); 1142 if (!group) 1143 return -EINVAL; 1144 1145 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 1146 if (!vdev) { 1147 vfio_iommu_group_put(group, &pdev->dev); 1148 return -ENOMEM; 1149 } 1150 1151 vdev->pdev = pdev; 1152 vdev->irq_type = VFIO_PCI_NUM_IRQS; 1153 mutex_init(&vdev->igate); 1154 spin_lock_init(&vdev->irqlock); 1155 1156 ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev); 1157 if (ret) { 1158 vfio_iommu_group_put(group, &pdev->dev); 1159 kfree(vdev); 1160 return ret; 1161 } 1162 1163 if (vfio_pci_is_vga(pdev)) { 1164 vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode); 1165 vga_set_legacy_decoding(pdev, 1166 vfio_pci_set_vga_decode(vdev, false)); 1167 } 1168 1169 if (!disable_idle_d3) { 1170 /* 1171 * pci-core sets the device power state to an unknown value at 1172 * bootup and after being removed from a driver. The only 1173 * transition it allows from this unknown state is to D0, which 1174 * typically happens when a driver calls pci_enable_device(). 1175 * We're not ready to enable the device yet, but we do want to 1176 * be able to get to D3. Therefore first do a D0 transition 1177 * before going to D3. 1178 */ 1179 pci_set_power_state(pdev, PCI_D0); 1180 pci_set_power_state(pdev, PCI_D3hot); 1181 } 1182 1183 return ret; 1184 } 1185 1186 static void vfio_pci_remove(struct pci_dev *pdev) 1187 { 1188 struct vfio_pci_device *vdev; 1189 1190 vdev = vfio_del_group_dev(&pdev->dev); 1191 if (!vdev) 1192 return; 1193 1194 vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev); 1195 kfree(vdev->region); 1196 kfree(vdev); 1197 1198 if (vfio_pci_is_vga(pdev)) { 1199 vga_client_register(pdev, NULL, NULL, NULL); 1200 vga_set_legacy_decoding(pdev, 1201 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | 1202 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); 1203 } 1204 1205 if (!disable_idle_d3) 1206 pci_set_power_state(pdev, PCI_D0); 1207 } 1208 1209 static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev, 1210 pci_channel_state_t state) 1211 { 1212 struct vfio_pci_device *vdev; 1213 struct vfio_device *device; 1214 1215 device = vfio_device_get_from_dev(&pdev->dev); 1216 if (device == NULL) 1217 return PCI_ERS_RESULT_DISCONNECT; 1218 1219 vdev = vfio_device_data(device); 1220 if (vdev == NULL) { 1221 vfio_device_put(device); 1222 return PCI_ERS_RESULT_DISCONNECT; 1223 } 1224 1225 mutex_lock(&vdev->igate); 1226 1227 if (vdev->err_trigger) 1228 eventfd_signal(vdev->err_trigger, 1); 1229 1230 mutex_unlock(&vdev->igate); 1231 1232 vfio_device_put(device); 1233 1234 return PCI_ERS_RESULT_CAN_RECOVER; 1235 } 1236 1237 static const struct pci_error_handlers vfio_err_handlers = { 1238 .error_detected = vfio_pci_aer_err_detected, 1239 }; 1240 1241 static struct pci_driver vfio_pci_driver = { 1242 .name = "vfio-pci", 1243 .id_table = NULL, /* only dynamic ids */ 1244 .probe = vfio_pci_probe, 1245 .remove = vfio_pci_remove, 1246 .err_handler = &vfio_err_handlers, 1247 }; 1248 1249 struct vfio_devices { 1250 struct vfio_device **devices; 1251 int cur_index; 1252 int max_index; 1253 }; 1254 1255 static int vfio_pci_get_devs(struct pci_dev *pdev, void *data) 1256 { 1257 struct vfio_devices *devs = data; 1258 struct vfio_device *device; 1259 1260 if (devs->cur_index == devs->max_index) 1261 return -ENOSPC; 1262 1263 device = vfio_device_get_from_dev(&pdev->dev); 1264 if (!device) 1265 return -EINVAL; 1266 1267 if (pci_dev_driver(pdev) != &vfio_pci_driver) { 1268 vfio_device_put(device); 1269 return -EBUSY; 1270 } 1271 1272 devs->devices[devs->cur_index++] = device; 1273 return 0; 1274 } 1275 1276 /* 1277 * Attempt to do a bus/slot reset if there are devices affected by a reset for 1278 * this device that are needs_reset and all of the affected devices are unused 1279 * (!refcnt). Callers are required to hold driver_lock when calling this to 1280 * prevent device opens and concurrent bus reset attempts. We prevent device 1281 * unbinds by acquiring and holding a reference to the vfio_device. 1282 * 1283 * NB: vfio-core considers a group to be viable even if some devices are 1284 * bound to drivers like pci-stub or pcieport. Here we require all devices 1285 * to be bound to vfio_pci since that's the only way we can be sure they 1286 * stay put. 1287 */ 1288 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev) 1289 { 1290 struct vfio_devices devs = { .cur_index = 0 }; 1291 int i = 0, ret = -EINVAL; 1292 bool needs_reset = false, slot = false; 1293 struct vfio_pci_device *tmp; 1294 1295 if (!pci_probe_reset_slot(vdev->pdev->slot)) 1296 slot = true; 1297 else if (pci_probe_reset_bus(vdev->pdev->bus)) 1298 return; 1299 1300 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs, 1301 &i, slot) || !i) 1302 return; 1303 1304 devs.max_index = i; 1305 devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL); 1306 if (!devs.devices) 1307 return; 1308 1309 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, 1310 vfio_pci_get_devs, &devs, slot)) 1311 goto put_devs; 1312 1313 for (i = 0; i < devs.cur_index; i++) { 1314 tmp = vfio_device_data(devs.devices[i]); 1315 if (tmp->needs_reset) 1316 needs_reset = true; 1317 if (tmp->refcnt) 1318 goto put_devs; 1319 } 1320 1321 if (needs_reset) 1322 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : 1323 pci_try_reset_bus(vdev->pdev->bus); 1324 1325 put_devs: 1326 for (i = 0; i < devs.cur_index; i++) { 1327 tmp = vfio_device_data(devs.devices[i]); 1328 if (!ret) 1329 tmp->needs_reset = false; 1330 1331 if (!tmp->refcnt && !disable_idle_d3) 1332 pci_set_power_state(tmp->pdev, PCI_D3hot); 1333 1334 vfio_device_put(devs.devices[i]); 1335 } 1336 1337 kfree(devs.devices); 1338 } 1339 1340 static void __exit vfio_pci_cleanup(void) 1341 { 1342 pci_unregister_driver(&vfio_pci_driver); 1343 vfio_pci_uninit_perm_bits(); 1344 } 1345 1346 static void __init vfio_pci_fill_ids(void) 1347 { 1348 char *p, *id; 1349 int rc; 1350 1351 /* no ids passed actually */ 1352 if (ids[0] == '\0') 1353 return; 1354 1355 /* add ids specified in the module parameter */ 1356 p = ids; 1357 while ((id = strsep(&p, ","))) { 1358 unsigned int vendor, device, subvendor = PCI_ANY_ID, 1359 subdevice = PCI_ANY_ID, class = 0, class_mask = 0; 1360 int fields; 1361 1362 if (!strlen(id)) 1363 continue; 1364 1365 fields = sscanf(id, "%x:%x:%x:%x:%x:%x", 1366 &vendor, &device, &subvendor, &subdevice, 1367 &class, &class_mask); 1368 1369 if (fields < 2) { 1370 pr_warn("invalid id string \"%s\"\n", id); 1371 continue; 1372 } 1373 1374 rc = pci_add_dynid(&vfio_pci_driver, vendor, device, 1375 subvendor, subdevice, class, class_mask, 0); 1376 if (rc) 1377 pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n", 1378 vendor, device, subvendor, subdevice, 1379 class, class_mask, rc); 1380 else 1381 pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n", 1382 vendor, device, subvendor, subdevice, 1383 class, class_mask); 1384 } 1385 } 1386 1387 static int __init vfio_pci_init(void) 1388 { 1389 int ret; 1390 1391 /* Allocate shared config space permision data used by all devices */ 1392 ret = vfio_pci_init_perm_bits(); 1393 if (ret) 1394 return ret; 1395 1396 /* Register and scan for devices */ 1397 ret = pci_register_driver(&vfio_pci_driver); 1398 if (ret) 1399 goto out_driver; 1400 1401 vfio_pci_fill_ids(); 1402 1403 return 0; 1404 1405 out_driver: 1406 vfio_pci_uninit_perm_bits(); 1407 return ret; 1408 } 1409 1410 module_init(vfio_pci_init); 1411 module_exit(vfio_pci_cleanup); 1412 1413 MODULE_VERSION(DRIVER_VERSION); 1414 MODULE_LICENSE("GPL v2"); 1415 MODULE_AUTHOR(DRIVER_AUTHOR); 1416 MODULE_DESCRIPTION(DRIVER_DESC); 1417