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 #include <linux/nospec.h> 32 33 #include "vfio_pci_private.h" 34 35 #define DRIVER_VERSION "0.2" 36 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>" 37 #define DRIVER_DESC "VFIO PCI - User Level meta-driver" 38 39 static char ids[1024] __initdata; 40 module_param_string(ids, ids, sizeof(ids), 0); 41 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"); 42 43 static bool nointxmask; 44 module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR); 45 MODULE_PARM_DESC(nointxmask, 46 "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."); 47 48 #ifdef CONFIG_VFIO_PCI_VGA 49 static bool disable_vga; 50 module_param(disable_vga, bool, S_IRUGO); 51 MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci"); 52 #endif 53 54 static bool disable_idle_d3; 55 module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR); 56 MODULE_PARM_DESC(disable_idle_d3, 57 "Disable using the PCI D3 low power state for idle, unused devices"); 58 59 static DEFINE_MUTEX(driver_lock); 60 61 static inline bool vfio_vga_disabled(void) 62 { 63 #ifdef CONFIG_VFIO_PCI_VGA 64 return disable_vga; 65 #else 66 return true; 67 #endif 68 } 69 70 /* 71 * Our VGA arbiter participation is limited since we don't know anything 72 * about the device itself. However, if the device is the only VGA device 73 * downstream of a bridge and VFIO VGA support is disabled, then we can 74 * safely return legacy VGA IO and memory as not decoded since the user 75 * has no way to get to it and routing can be disabled externally at the 76 * bridge. 77 */ 78 static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga) 79 { 80 struct vfio_pci_device *vdev = opaque; 81 struct pci_dev *tmp = NULL, *pdev = vdev->pdev; 82 unsigned char max_busnr; 83 unsigned int decodes; 84 85 if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus)) 86 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | 87 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; 88 89 max_busnr = pci_bus_max_busnr(pdev->bus); 90 decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; 91 92 while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) { 93 if (tmp == pdev || 94 pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) || 95 pci_is_root_bus(tmp->bus)) 96 continue; 97 98 if (tmp->bus->number >= pdev->bus->number && 99 tmp->bus->number <= max_busnr) { 100 pci_dev_put(tmp); 101 decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; 102 break; 103 } 104 } 105 106 return decodes; 107 } 108 109 static inline bool vfio_pci_is_vga(struct pci_dev *pdev) 110 { 111 return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; 112 } 113 114 static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev) 115 { 116 struct resource *res; 117 int bar; 118 struct vfio_pci_dummy_resource *dummy_res; 119 120 INIT_LIST_HEAD(&vdev->dummy_resources_list); 121 122 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { 123 res = vdev->pdev->resource + bar; 124 125 if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP)) 126 goto no_mmap; 127 128 if (!(res->flags & IORESOURCE_MEM)) 129 goto no_mmap; 130 131 /* 132 * The PCI core shouldn't set up a resource with a 133 * type but zero size. But there may be bugs that 134 * cause us to do that. 135 */ 136 if (!resource_size(res)) 137 goto no_mmap; 138 139 if (resource_size(res) >= PAGE_SIZE) { 140 vdev->bar_mmap_supported[bar] = true; 141 continue; 142 } 143 144 if (!(res->start & ~PAGE_MASK)) { 145 /* 146 * Add a dummy resource to reserve the remainder 147 * of the exclusive page in case that hot-add 148 * device's bar is assigned into it. 149 */ 150 dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL); 151 if (dummy_res == NULL) 152 goto no_mmap; 153 154 dummy_res->resource.name = "vfio sub-page reserved"; 155 dummy_res->resource.start = res->end + 1; 156 dummy_res->resource.end = res->start + PAGE_SIZE - 1; 157 dummy_res->resource.flags = res->flags; 158 if (request_resource(res->parent, 159 &dummy_res->resource)) { 160 kfree(dummy_res); 161 goto no_mmap; 162 } 163 dummy_res->index = bar; 164 list_add(&dummy_res->res_next, 165 &vdev->dummy_resources_list); 166 vdev->bar_mmap_supported[bar] = true; 167 continue; 168 } 169 /* 170 * Here we don't handle the case when the BAR is not page 171 * aligned because we can't expect the BAR will be 172 * assigned into the same location in a page in guest 173 * when we passthrough the BAR. And it's hard to access 174 * this BAR in userspace because we have no way to get 175 * the BAR's location in a page. 176 */ 177 no_mmap: 178 vdev->bar_mmap_supported[bar] = false; 179 } 180 } 181 182 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev); 183 static void vfio_pci_disable(struct vfio_pci_device *vdev); 184 185 /* 186 * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND 187 * _and_ the ability detect when the device is asserting INTx via PCI_STATUS. 188 * If a device implements the former but not the latter we would typically 189 * expect broken_intx_masking be set and require an exclusive interrupt. 190 * However since we do have control of the device's ability to assert INTx, 191 * we can instead pretend that the device does not implement INTx, virtualizing 192 * the pin register to report zero and maintaining DisINTx set on the host. 193 */ 194 static bool vfio_pci_nointx(struct pci_dev *pdev) 195 { 196 switch (pdev->vendor) { 197 case PCI_VENDOR_ID_INTEL: 198 switch (pdev->device) { 199 /* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */ 200 case 0x1572: 201 case 0x1574: 202 case 0x1580 ... 0x1581: 203 case 0x1583 ... 0x158b: 204 case 0x37d0 ... 0x37d2: 205 return true; 206 default: 207 return false; 208 } 209 } 210 211 return false; 212 } 213 214 static int vfio_pci_enable(struct vfio_pci_device *vdev) 215 { 216 struct pci_dev *pdev = vdev->pdev; 217 int ret; 218 u16 cmd; 219 u8 msix_pos; 220 221 pci_set_power_state(pdev, PCI_D0); 222 223 /* Don't allow our initial saved state to include busmaster */ 224 pci_clear_master(pdev); 225 226 ret = pci_enable_device(pdev); 227 if (ret) 228 return ret; 229 230 /* If reset fails because of the device lock, fail this path entirely */ 231 ret = pci_try_reset_function(pdev); 232 if (ret == -EAGAIN) { 233 pci_disable_device(pdev); 234 return ret; 235 } 236 237 vdev->reset_works = !ret; 238 pci_save_state(pdev); 239 vdev->pci_saved_state = pci_store_saved_state(pdev); 240 if (!vdev->pci_saved_state) 241 pr_debug("%s: Couldn't store %s saved state\n", 242 __func__, dev_name(&pdev->dev)); 243 244 if (likely(!nointxmask)) { 245 if (vfio_pci_nointx(pdev)) { 246 dev_info(&pdev->dev, "Masking broken INTx support\n"); 247 vdev->nointx = true; 248 pci_intx(pdev, 0); 249 } else 250 vdev->pci_2_3 = pci_intx_mask_supported(pdev); 251 } 252 253 pci_read_config_word(pdev, PCI_COMMAND, &cmd); 254 if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) { 255 cmd &= ~PCI_COMMAND_INTX_DISABLE; 256 pci_write_config_word(pdev, PCI_COMMAND, cmd); 257 } 258 259 ret = vfio_config_init(vdev); 260 if (ret) { 261 kfree(vdev->pci_saved_state); 262 vdev->pci_saved_state = NULL; 263 pci_disable_device(pdev); 264 return ret; 265 } 266 267 msix_pos = pdev->msix_cap; 268 if (msix_pos) { 269 u16 flags; 270 u32 table; 271 272 pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags); 273 pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table); 274 275 vdev->msix_bar = table & PCI_MSIX_TABLE_BIR; 276 vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET; 277 vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16; 278 } else 279 vdev->msix_bar = 0xFF; 280 281 if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev)) 282 vdev->has_vga = true; 283 284 285 if (vfio_pci_is_vga(pdev) && 286 pdev->vendor == PCI_VENDOR_ID_INTEL && 287 IS_ENABLED(CONFIG_VFIO_PCI_IGD)) { 288 ret = vfio_pci_igd_init(vdev); 289 if (ret) { 290 dev_warn(&vdev->pdev->dev, 291 "Failed to setup Intel IGD regions\n"); 292 vfio_pci_disable(vdev); 293 return ret; 294 } 295 } 296 297 vfio_pci_probe_mmaps(vdev); 298 299 return 0; 300 } 301 302 static void vfio_pci_disable(struct vfio_pci_device *vdev) 303 { 304 struct pci_dev *pdev = vdev->pdev; 305 struct vfio_pci_dummy_resource *dummy_res, *tmp; 306 struct vfio_pci_ioeventfd *ioeventfd, *ioeventfd_tmp; 307 int i, bar; 308 309 /* Stop the device from further DMA */ 310 pci_clear_master(pdev); 311 312 vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE | 313 VFIO_IRQ_SET_ACTION_TRIGGER, 314 vdev->irq_type, 0, 0, NULL); 315 316 /* Device closed, don't need mutex here */ 317 list_for_each_entry_safe(ioeventfd, ioeventfd_tmp, 318 &vdev->ioeventfds_list, next) { 319 vfio_virqfd_disable(&ioeventfd->virqfd); 320 list_del(&ioeventfd->next); 321 kfree(ioeventfd); 322 } 323 vdev->ioeventfds_nr = 0; 324 325 vdev->virq_disabled = false; 326 327 for (i = 0; i < vdev->num_regions; i++) 328 vdev->region[i].ops->release(vdev, &vdev->region[i]); 329 330 vdev->num_regions = 0; 331 kfree(vdev->region); 332 vdev->region = NULL; /* don't krealloc a freed pointer */ 333 334 vfio_config_free(vdev); 335 336 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { 337 if (!vdev->barmap[bar]) 338 continue; 339 pci_iounmap(pdev, vdev->barmap[bar]); 340 pci_release_selected_regions(pdev, 1 << bar); 341 vdev->barmap[bar] = NULL; 342 } 343 344 list_for_each_entry_safe(dummy_res, tmp, 345 &vdev->dummy_resources_list, res_next) { 346 list_del(&dummy_res->res_next); 347 release_resource(&dummy_res->resource); 348 kfree(dummy_res); 349 } 350 351 vdev->needs_reset = true; 352 353 /* 354 * If we have saved state, restore it. If we can reset the device, 355 * even better. Resetting with current state seems better than 356 * nothing, but saving and restoring current state without reset 357 * is just busy work. 358 */ 359 if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) { 360 pr_info("%s: Couldn't reload %s saved state\n", 361 __func__, dev_name(&pdev->dev)); 362 363 if (!vdev->reset_works) 364 goto out; 365 366 pci_save_state(pdev); 367 } 368 369 /* 370 * Disable INTx and MSI, presumably to avoid spurious interrupts 371 * during reset. Stolen from pci_reset_function() 372 */ 373 pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); 374 375 /* 376 * Try to reset the device. The success of this is dependent on 377 * being able to lock the device, which is not always possible. 378 */ 379 if (vdev->reset_works && !pci_try_reset_function(pdev)) 380 vdev->needs_reset = false; 381 382 pci_restore_state(pdev); 383 out: 384 pci_disable_device(pdev); 385 386 vfio_pci_try_bus_reset(vdev); 387 388 if (!disable_idle_d3) 389 pci_set_power_state(pdev, PCI_D3hot); 390 } 391 392 static void vfio_pci_release(void *device_data) 393 { 394 struct vfio_pci_device *vdev = device_data; 395 396 mutex_lock(&driver_lock); 397 398 if (!(--vdev->refcnt)) { 399 vfio_spapr_pci_eeh_release(vdev->pdev); 400 vfio_pci_disable(vdev); 401 } 402 403 mutex_unlock(&driver_lock); 404 405 module_put(THIS_MODULE); 406 } 407 408 static int vfio_pci_open(void *device_data) 409 { 410 struct vfio_pci_device *vdev = device_data; 411 int ret = 0; 412 413 if (!try_module_get(THIS_MODULE)) 414 return -ENODEV; 415 416 mutex_lock(&driver_lock); 417 418 if (!vdev->refcnt) { 419 ret = vfio_pci_enable(vdev); 420 if (ret) 421 goto error; 422 423 vfio_spapr_pci_eeh_open(vdev->pdev); 424 } 425 vdev->refcnt++; 426 error: 427 mutex_unlock(&driver_lock); 428 if (ret) 429 module_put(THIS_MODULE); 430 return ret; 431 } 432 433 static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type) 434 { 435 if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) { 436 u8 pin; 437 438 if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) || 439 vdev->nointx || vdev->pdev->is_virtfn) 440 return 0; 441 442 pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin); 443 444 return pin ? 1 : 0; 445 } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) { 446 u8 pos; 447 u16 flags; 448 449 pos = vdev->pdev->msi_cap; 450 if (pos) { 451 pci_read_config_word(vdev->pdev, 452 pos + PCI_MSI_FLAGS, &flags); 453 return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1); 454 } 455 } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) { 456 u8 pos; 457 u16 flags; 458 459 pos = vdev->pdev->msix_cap; 460 if (pos) { 461 pci_read_config_word(vdev->pdev, 462 pos + PCI_MSIX_FLAGS, &flags); 463 464 return (flags & PCI_MSIX_FLAGS_QSIZE) + 1; 465 } 466 } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) { 467 if (pci_is_pcie(vdev->pdev)) 468 return 1; 469 } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) { 470 return 1; 471 } 472 473 return 0; 474 } 475 476 static int vfio_pci_count_devs(struct pci_dev *pdev, void *data) 477 { 478 (*(int *)data)++; 479 return 0; 480 } 481 482 struct vfio_pci_fill_info { 483 int max; 484 int cur; 485 struct vfio_pci_dependent_device *devices; 486 }; 487 488 static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data) 489 { 490 struct vfio_pci_fill_info *fill = data; 491 struct iommu_group *iommu_group; 492 493 if (fill->cur == fill->max) 494 return -EAGAIN; /* Something changed, try again */ 495 496 iommu_group = iommu_group_get(&pdev->dev); 497 if (!iommu_group) 498 return -EPERM; /* Cannot reset non-isolated devices */ 499 500 fill->devices[fill->cur].group_id = iommu_group_id(iommu_group); 501 fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus); 502 fill->devices[fill->cur].bus = pdev->bus->number; 503 fill->devices[fill->cur].devfn = pdev->devfn; 504 fill->cur++; 505 iommu_group_put(iommu_group); 506 return 0; 507 } 508 509 struct vfio_pci_group_entry { 510 struct vfio_group *group; 511 int id; 512 }; 513 514 struct vfio_pci_group_info { 515 int count; 516 struct vfio_pci_group_entry *groups; 517 }; 518 519 static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data) 520 { 521 struct vfio_pci_group_info *info = data; 522 struct iommu_group *group; 523 int id, i; 524 525 group = iommu_group_get(&pdev->dev); 526 if (!group) 527 return -EPERM; 528 529 id = iommu_group_id(group); 530 531 for (i = 0; i < info->count; i++) 532 if (info->groups[i].id == id) 533 break; 534 535 iommu_group_put(group); 536 537 return (i == info->count) ? -EINVAL : 0; 538 } 539 540 static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot) 541 { 542 for (; pdev; pdev = pdev->bus->self) 543 if (pdev->bus == slot->bus) 544 return (pdev->slot == slot); 545 return false; 546 } 547 548 struct vfio_pci_walk_info { 549 int (*fn)(struct pci_dev *, void *data); 550 void *data; 551 struct pci_dev *pdev; 552 bool slot; 553 int ret; 554 }; 555 556 static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data) 557 { 558 struct vfio_pci_walk_info *walk = data; 559 560 if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot)) 561 walk->ret = walk->fn(pdev, walk->data); 562 563 return walk->ret; 564 } 565 566 static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev, 567 int (*fn)(struct pci_dev *, 568 void *data), void *data, 569 bool slot) 570 { 571 struct vfio_pci_walk_info walk = { 572 .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0, 573 }; 574 575 pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk); 576 577 return walk.ret; 578 } 579 580 static int msix_mmappable_cap(struct vfio_pci_device *vdev, 581 struct vfio_info_cap *caps) 582 { 583 struct vfio_info_cap_header header = { 584 .id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE, 585 .version = 1 586 }; 587 588 return vfio_info_add_capability(caps, &header, sizeof(header)); 589 } 590 591 int vfio_pci_register_dev_region(struct vfio_pci_device *vdev, 592 unsigned int type, unsigned int subtype, 593 const struct vfio_pci_regops *ops, 594 size_t size, u32 flags, void *data) 595 { 596 struct vfio_pci_region *region; 597 598 region = krealloc(vdev->region, 599 (vdev->num_regions + 1) * sizeof(*region), 600 GFP_KERNEL); 601 if (!region) 602 return -ENOMEM; 603 604 vdev->region = region; 605 vdev->region[vdev->num_regions].type = type; 606 vdev->region[vdev->num_regions].subtype = subtype; 607 vdev->region[vdev->num_regions].ops = ops; 608 vdev->region[vdev->num_regions].size = size; 609 vdev->region[vdev->num_regions].flags = flags; 610 vdev->region[vdev->num_regions].data = data; 611 612 vdev->num_regions++; 613 614 return 0; 615 } 616 617 static long vfio_pci_ioctl(void *device_data, 618 unsigned int cmd, unsigned long arg) 619 { 620 struct vfio_pci_device *vdev = device_data; 621 unsigned long minsz; 622 623 if (cmd == VFIO_DEVICE_GET_INFO) { 624 struct vfio_device_info info; 625 626 minsz = offsetofend(struct vfio_device_info, num_irqs); 627 628 if (copy_from_user(&info, (void __user *)arg, minsz)) 629 return -EFAULT; 630 631 if (info.argsz < minsz) 632 return -EINVAL; 633 634 info.flags = VFIO_DEVICE_FLAGS_PCI; 635 636 if (vdev->reset_works) 637 info.flags |= VFIO_DEVICE_FLAGS_RESET; 638 639 info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions; 640 info.num_irqs = VFIO_PCI_NUM_IRQS; 641 642 return copy_to_user((void __user *)arg, &info, minsz) ? 643 -EFAULT : 0; 644 645 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { 646 struct pci_dev *pdev = vdev->pdev; 647 struct vfio_region_info info; 648 struct vfio_info_cap caps = { .buf = NULL, .size = 0 }; 649 int i, ret; 650 651 minsz = offsetofend(struct vfio_region_info, offset); 652 653 if (copy_from_user(&info, (void __user *)arg, minsz)) 654 return -EFAULT; 655 656 if (info.argsz < minsz) 657 return -EINVAL; 658 659 switch (info.index) { 660 case VFIO_PCI_CONFIG_REGION_INDEX: 661 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 662 info.size = pdev->cfg_size; 663 info.flags = VFIO_REGION_INFO_FLAG_READ | 664 VFIO_REGION_INFO_FLAG_WRITE; 665 break; 666 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: 667 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 668 info.size = pci_resource_len(pdev, info.index); 669 if (!info.size) { 670 info.flags = 0; 671 break; 672 } 673 674 info.flags = VFIO_REGION_INFO_FLAG_READ | 675 VFIO_REGION_INFO_FLAG_WRITE; 676 if (vdev->bar_mmap_supported[info.index]) { 677 info.flags |= VFIO_REGION_INFO_FLAG_MMAP; 678 if (info.index == vdev->msix_bar) { 679 ret = msix_mmappable_cap(vdev, &caps); 680 if (ret) 681 return ret; 682 } 683 } 684 685 break; 686 case VFIO_PCI_ROM_REGION_INDEX: 687 { 688 void __iomem *io; 689 size_t size; 690 691 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 692 info.flags = 0; 693 694 /* Report the BAR size, not the ROM size */ 695 info.size = pci_resource_len(pdev, info.index); 696 if (!info.size) { 697 /* Shadow ROMs appear as PCI option ROMs */ 698 if (pdev->resource[PCI_ROM_RESOURCE].flags & 699 IORESOURCE_ROM_SHADOW) 700 info.size = 0x20000; 701 else 702 break; 703 } 704 705 /* Is it really there? */ 706 io = pci_map_rom(pdev, &size); 707 if (!io || !size) { 708 info.size = 0; 709 break; 710 } 711 pci_unmap_rom(pdev, io); 712 713 info.flags = VFIO_REGION_INFO_FLAG_READ; 714 break; 715 } 716 case VFIO_PCI_VGA_REGION_INDEX: 717 if (!vdev->has_vga) 718 return -EINVAL; 719 720 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 721 info.size = 0xc0000; 722 info.flags = VFIO_REGION_INFO_FLAG_READ | 723 VFIO_REGION_INFO_FLAG_WRITE; 724 725 break; 726 default: 727 { 728 struct vfio_region_info_cap_type cap_type = { 729 .header.id = VFIO_REGION_INFO_CAP_TYPE, 730 .header.version = 1 }; 731 732 if (info.index >= 733 VFIO_PCI_NUM_REGIONS + vdev->num_regions) 734 return -EINVAL; 735 info.index = array_index_nospec(info.index, 736 VFIO_PCI_NUM_REGIONS + 737 vdev->num_regions); 738 739 i = info.index - VFIO_PCI_NUM_REGIONS; 740 741 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 742 info.size = vdev->region[i].size; 743 info.flags = vdev->region[i].flags; 744 745 cap_type.type = vdev->region[i].type; 746 cap_type.subtype = vdev->region[i].subtype; 747 748 ret = vfio_info_add_capability(&caps, &cap_type.header, 749 sizeof(cap_type)); 750 if (ret) 751 return ret; 752 753 } 754 } 755 756 if (caps.size) { 757 info.flags |= VFIO_REGION_INFO_FLAG_CAPS; 758 if (info.argsz < sizeof(info) + caps.size) { 759 info.argsz = sizeof(info) + caps.size; 760 info.cap_offset = 0; 761 } else { 762 vfio_info_cap_shift(&caps, sizeof(info)); 763 if (copy_to_user((void __user *)arg + 764 sizeof(info), caps.buf, 765 caps.size)) { 766 kfree(caps.buf); 767 return -EFAULT; 768 } 769 info.cap_offset = sizeof(info); 770 } 771 772 kfree(caps.buf); 773 } 774 775 return copy_to_user((void __user *)arg, &info, minsz) ? 776 -EFAULT : 0; 777 778 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { 779 struct vfio_irq_info info; 780 781 minsz = offsetofend(struct vfio_irq_info, count); 782 783 if (copy_from_user(&info, (void __user *)arg, minsz)) 784 return -EFAULT; 785 786 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS) 787 return -EINVAL; 788 789 switch (info.index) { 790 case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX: 791 case VFIO_PCI_REQ_IRQ_INDEX: 792 break; 793 case VFIO_PCI_ERR_IRQ_INDEX: 794 if (pci_is_pcie(vdev->pdev)) 795 break; 796 /* fall through */ 797 default: 798 return -EINVAL; 799 } 800 801 info.flags = VFIO_IRQ_INFO_EVENTFD; 802 803 info.count = vfio_pci_get_irq_count(vdev, info.index); 804 805 if (info.index == VFIO_PCI_INTX_IRQ_INDEX) 806 info.flags |= (VFIO_IRQ_INFO_MASKABLE | 807 VFIO_IRQ_INFO_AUTOMASKED); 808 else 809 info.flags |= VFIO_IRQ_INFO_NORESIZE; 810 811 return copy_to_user((void __user *)arg, &info, minsz) ? 812 -EFAULT : 0; 813 814 } else if (cmd == VFIO_DEVICE_SET_IRQS) { 815 struct vfio_irq_set hdr; 816 u8 *data = NULL; 817 int max, ret = 0; 818 size_t data_size = 0; 819 820 minsz = offsetofend(struct vfio_irq_set, count); 821 822 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 823 return -EFAULT; 824 825 max = vfio_pci_get_irq_count(vdev, hdr.index); 826 827 ret = vfio_set_irqs_validate_and_prepare(&hdr, max, 828 VFIO_PCI_NUM_IRQS, &data_size); 829 if (ret) 830 return ret; 831 832 if (data_size) { 833 data = memdup_user((void __user *)(arg + minsz), 834 data_size); 835 if (IS_ERR(data)) 836 return PTR_ERR(data); 837 } 838 839 mutex_lock(&vdev->igate); 840 841 ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index, 842 hdr.start, hdr.count, data); 843 844 mutex_unlock(&vdev->igate); 845 kfree(data); 846 847 return ret; 848 849 } else if (cmd == VFIO_DEVICE_RESET) { 850 return vdev->reset_works ? 851 pci_try_reset_function(vdev->pdev) : -EINVAL; 852 853 } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) { 854 struct vfio_pci_hot_reset_info hdr; 855 struct vfio_pci_fill_info fill = { 0 }; 856 struct vfio_pci_dependent_device *devices = NULL; 857 bool slot = false; 858 int ret = 0; 859 860 minsz = offsetofend(struct vfio_pci_hot_reset_info, count); 861 862 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 863 return -EFAULT; 864 865 if (hdr.argsz < minsz) 866 return -EINVAL; 867 868 hdr.flags = 0; 869 870 /* Can we do a slot or bus reset or neither? */ 871 if (!pci_probe_reset_slot(vdev->pdev->slot)) 872 slot = true; 873 else if (pci_probe_reset_bus(vdev->pdev->bus)) 874 return -ENODEV; 875 876 /* How many devices are affected? */ 877 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 878 vfio_pci_count_devs, 879 &fill.max, slot); 880 if (ret) 881 return ret; 882 883 WARN_ON(!fill.max); /* Should always be at least one */ 884 885 /* 886 * If there's enough space, fill it now, otherwise return 887 * -ENOSPC and the number of devices affected. 888 */ 889 if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) { 890 ret = -ENOSPC; 891 hdr.count = fill.max; 892 goto reset_info_exit; 893 } 894 895 devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL); 896 if (!devices) 897 return -ENOMEM; 898 899 fill.devices = devices; 900 901 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 902 vfio_pci_fill_devs, 903 &fill, slot); 904 905 /* 906 * If a device was removed between counting and filling, 907 * we may come up short of fill.max. If a device was 908 * added, we'll have a return of -EAGAIN above. 909 */ 910 if (!ret) 911 hdr.count = fill.cur; 912 913 reset_info_exit: 914 if (copy_to_user((void __user *)arg, &hdr, minsz)) 915 ret = -EFAULT; 916 917 if (!ret) { 918 if (copy_to_user((void __user *)(arg + minsz), devices, 919 hdr.count * sizeof(*devices))) 920 ret = -EFAULT; 921 } 922 923 kfree(devices); 924 return ret; 925 926 } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) { 927 struct vfio_pci_hot_reset hdr; 928 int32_t *group_fds; 929 struct vfio_pci_group_entry *groups; 930 struct vfio_pci_group_info info; 931 bool slot = false; 932 int i, count = 0, ret = 0; 933 934 minsz = offsetofend(struct vfio_pci_hot_reset, count); 935 936 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 937 return -EFAULT; 938 939 if (hdr.argsz < minsz || hdr.flags) 940 return -EINVAL; 941 942 /* Can we do a slot or bus reset or neither? */ 943 if (!pci_probe_reset_slot(vdev->pdev->slot)) 944 slot = true; 945 else if (pci_probe_reset_bus(vdev->pdev->bus)) 946 return -ENODEV; 947 948 /* 949 * We can't let userspace give us an arbitrarily large 950 * buffer to copy, so verify how many we think there 951 * could be. Note groups can have multiple devices so 952 * one group per device is the max. 953 */ 954 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 955 vfio_pci_count_devs, 956 &count, slot); 957 if (ret) 958 return ret; 959 960 /* Somewhere between 1 and count is OK */ 961 if (!hdr.count || hdr.count > count) 962 return -EINVAL; 963 964 group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL); 965 groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL); 966 if (!group_fds || !groups) { 967 kfree(group_fds); 968 kfree(groups); 969 return -ENOMEM; 970 } 971 972 if (copy_from_user(group_fds, (void __user *)(arg + minsz), 973 hdr.count * sizeof(*group_fds))) { 974 kfree(group_fds); 975 kfree(groups); 976 return -EFAULT; 977 } 978 979 /* 980 * For each group_fd, get the group through the vfio external 981 * user interface and store the group and iommu ID. This 982 * ensures the group is held across the reset. 983 */ 984 for (i = 0; i < hdr.count; i++) { 985 struct vfio_group *group; 986 struct fd f = fdget(group_fds[i]); 987 if (!f.file) { 988 ret = -EBADF; 989 break; 990 } 991 992 group = vfio_group_get_external_user(f.file); 993 fdput(f); 994 if (IS_ERR(group)) { 995 ret = PTR_ERR(group); 996 break; 997 } 998 999 groups[i].group = group; 1000 groups[i].id = vfio_external_user_iommu_id(group); 1001 } 1002 1003 kfree(group_fds); 1004 1005 /* release reference to groups on error */ 1006 if (ret) 1007 goto hot_reset_release; 1008 1009 info.count = hdr.count; 1010 info.groups = groups; 1011 1012 /* 1013 * Test whether all the affected devices are contained 1014 * by the set of groups provided by the user. 1015 */ 1016 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 1017 vfio_pci_validate_devs, 1018 &info, slot); 1019 if (!ret) 1020 /* User has access, do the reset */ 1021 ret = pci_reset_bus(vdev->pdev); 1022 1023 hot_reset_release: 1024 for (i--; i >= 0; i--) 1025 vfio_group_put_external_user(groups[i].group); 1026 1027 kfree(groups); 1028 return ret; 1029 } else if (cmd == VFIO_DEVICE_IOEVENTFD) { 1030 struct vfio_device_ioeventfd ioeventfd; 1031 int count; 1032 1033 minsz = offsetofend(struct vfio_device_ioeventfd, fd); 1034 1035 if (copy_from_user(&ioeventfd, (void __user *)arg, minsz)) 1036 return -EFAULT; 1037 1038 if (ioeventfd.argsz < minsz) 1039 return -EINVAL; 1040 1041 if (ioeventfd.flags & ~VFIO_DEVICE_IOEVENTFD_SIZE_MASK) 1042 return -EINVAL; 1043 1044 count = ioeventfd.flags & VFIO_DEVICE_IOEVENTFD_SIZE_MASK; 1045 1046 if (hweight8(count) != 1 || ioeventfd.fd < -1) 1047 return -EINVAL; 1048 1049 return vfio_pci_ioeventfd(vdev, ioeventfd.offset, 1050 ioeventfd.data, count, ioeventfd.fd); 1051 } 1052 1053 return -ENOTTY; 1054 } 1055 1056 static ssize_t vfio_pci_rw(void *device_data, char __user *buf, 1057 size_t count, loff_t *ppos, bool iswrite) 1058 { 1059 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos); 1060 struct vfio_pci_device *vdev = device_data; 1061 1062 if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions) 1063 return -EINVAL; 1064 1065 switch (index) { 1066 case VFIO_PCI_CONFIG_REGION_INDEX: 1067 return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite); 1068 1069 case VFIO_PCI_ROM_REGION_INDEX: 1070 if (iswrite) 1071 return -EINVAL; 1072 return vfio_pci_bar_rw(vdev, buf, count, ppos, false); 1073 1074 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: 1075 return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite); 1076 1077 case VFIO_PCI_VGA_REGION_INDEX: 1078 return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite); 1079 default: 1080 index -= VFIO_PCI_NUM_REGIONS; 1081 return vdev->region[index].ops->rw(vdev, buf, 1082 count, ppos, iswrite); 1083 } 1084 1085 return -EINVAL; 1086 } 1087 1088 static ssize_t vfio_pci_read(void *device_data, char __user *buf, 1089 size_t count, loff_t *ppos) 1090 { 1091 if (!count) 1092 return 0; 1093 1094 return vfio_pci_rw(device_data, buf, count, ppos, false); 1095 } 1096 1097 static ssize_t vfio_pci_write(void *device_data, const char __user *buf, 1098 size_t count, loff_t *ppos) 1099 { 1100 if (!count) 1101 return 0; 1102 1103 return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true); 1104 } 1105 1106 static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma) 1107 { 1108 struct vfio_pci_device *vdev = device_data; 1109 struct pci_dev *pdev = vdev->pdev; 1110 unsigned int index; 1111 u64 phys_len, req_len, pgoff, req_start; 1112 int ret; 1113 1114 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); 1115 1116 if (vma->vm_end < vma->vm_start) 1117 return -EINVAL; 1118 if ((vma->vm_flags & VM_SHARED) == 0) 1119 return -EINVAL; 1120 if (index >= VFIO_PCI_ROM_REGION_INDEX) 1121 return -EINVAL; 1122 if (!vdev->bar_mmap_supported[index]) 1123 return -EINVAL; 1124 1125 phys_len = PAGE_ALIGN(pci_resource_len(pdev, index)); 1126 req_len = vma->vm_end - vma->vm_start; 1127 pgoff = vma->vm_pgoff & 1128 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1); 1129 req_start = pgoff << PAGE_SHIFT; 1130 1131 if (req_start + req_len > phys_len) 1132 return -EINVAL; 1133 1134 /* 1135 * Even though we don't make use of the barmap for the mmap, 1136 * we need to request the region and the barmap tracks that. 1137 */ 1138 if (!vdev->barmap[index]) { 1139 ret = pci_request_selected_regions(pdev, 1140 1 << index, "vfio-pci"); 1141 if (ret) 1142 return ret; 1143 1144 vdev->barmap[index] = pci_iomap(pdev, index, 0); 1145 if (!vdev->barmap[index]) { 1146 pci_release_selected_regions(pdev, 1 << index); 1147 return -ENOMEM; 1148 } 1149 } 1150 1151 vma->vm_private_data = vdev; 1152 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1153 vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff; 1154 1155 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, 1156 req_len, vma->vm_page_prot); 1157 } 1158 1159 static void vfio_pci_request(void *device_data, unsigned int count) 1160 { 1161 struct vfio_pci_device *vdev = device_data; 1162 1163 mutex_lock(&vdev->igate); 1164 1165 if (vdev->req_trigger) { 1166 if (!(count % 10)) 1167 dev_notice_ratelimited(&vdev->pdev->dev, 1168 "Relaying device request to user (#%u)\n", 1169 count); 1170 eventfd_signal(vdev->req_trigger, 1); 1171 } else if (count == 0) { 1172 dev_warn(&vdev->pdev->dev, 1173 "No device request channel registered, blocked until released by user\n"); 1174 } 1175 1176 mutex_unlock(&vdev->igate); 1177 } 1178 1179 static const struct vfio_device_ops vfio_pci_ops = { 1180 .name = "vfio-pci", 1181 .open = vfio_pci_open, 1182 .release = vfio_pci_release, 1183 .ioctl = vfio_pci_ioctl, 1184 .read = vfio_pci_read, 1185 .write = vfio_pci_write, 1186 .mmap = vfio_pci_mmap, 1187 .request = vfio_pci_request, 1188 }; 1189 1190 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 1191 { 1192 struct vfio_pci_device *vdev; 1193 struct iommu_group *group; 1194 int ret; 1195 1196 if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL) 1197 return -EINVAL; 1198 1199 /* 1200 * Prevent binding to PFs with VFs enabled, this too easily allows 1201 * userspace instance with VFs and PFs from the same device, which 1202 * cannot work. Disabling SR-IOV here would initiate removing the 1203 * VFs, which would unbind the driver, which is prone to blocking 1204 * if that VF is also in use by vfio-pci. Just reject these PFs 1205 * and let the user sort it out. 1206 */ 1207 if (pci_num_vf(pdev)) { 1208 pci_warn(pdev, "Cannot bind to PF with SR-IOV enabled\n"); 1209 return -EBUSY; 1210 } 1211 1212 group = vfio_iommu_group_get(&pdev->dev); 1213 if (!group) 1214 return -EINVAL; 1215 1216 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 1217 if (!vdev) { 1218 vfio_iommu_group_put(group, &pdev->dev); 1219 return -ENOMEM; 1220 } 1221 1222 vdev->pdev = pdev; 1223 vdev->irq_type = VFIO_PCI_NUM_IRQS; 1224 mutex_init(&vdev->igate); 1225 spin_lock_init(&vdev->irqlock); 1226 mutex_init(&vdev->ioeventfds_lock); 1227 INIT_LIST_HEAD(&vdev->ioeventfds_list); 1228 1229 ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev); 1230 if (ret) { 1231 vfio_iommu_group_put(group, &pdev->dev); 1232 kfree(vdev); 1233 return ret; 1234 } 1235 1236 if (vfio_pci_is_vga(pdev)) { 1237 vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode); 1238 vga_set_legacy_decoding(pdev, 1239 vfio_pci_set_vga_decode(vdev, false)); 1240 } 1241 1242 if (!disable_idle_d3) { 1243 /* 1244 * pci-core sets the device power state to an unknown value at 1245 * bootup and after being removed from a driver. The only 1246 * transition it allows from this unknown state is to D0, which 1247 * typically happens when a driver calls pci_enable_device(). 1248 * We're not ready to enable the device yet, but we do want to 1249 * be able to get to D3. Therefore first do a D0 transition 1250 * before going to D3. 1251 */ 1252 pci_set_power_state(pdev, PCI_D0); 1253 pci_set_power_state(pdev, PCI_D3hot); 1254 } 1255 1256 return ret; 1257 } 1258 1259 static void vfio_pci_remove(struct pci_dev *pdev) 1260 { 1261 struct vfio_pci_device *vdev; 1262 1263 vdev = vfio_del_group_dev(&pdev->dev); 1264 if (!vdev) 1265 return; 1266 1267 vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev); 1268 kfree(vdev->region); 1269 mutex_destroy(&vdev->ioeventfds_lock); 1270 kfree(vdev); 1271 1272 if (vfio_pci_is_vga(pdev)) { 1273 vga_client_register(pdev, NULL, NULL, NULL); 1274 vga_set_legacy_decoding(pdev, 1275 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | 1276 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); 1277 } 1278 1279 if (!disable_idle_d3) 1280 pci_set_power_state(pdev, PCI_D0); 1281 } 1282 1283 static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev, 1284 pci_channel_state_t state) 1285 { 1286 struct vfio_pci_device *vdev; 1287 struct vfio_device *device; 1288 1289 device = vfio_device_get_from_dev(&pdev->dev); 1290 if (device == NULL) 1291 return PCI_ERS_RESULT_DISCONNECT; 1292 1293 vdev = vfio_device_data(device); 1294 if (vdev == NULL) { 1295 vfio_device_put(device); 1296 return PCI_ERS_RESULT_DISCONNECT; 1297 } 1298 1299 mutex_lock(&vdev->igate); 1300 1301 if (vdev->err_trigger) 1302 eventfd_signal(vdev->err_trigger, 1); 1303 1304 mutex_unlock(&vdev->igate); 1305 1306 vfio_device_put(device); 1307 1308 return PCI_ERS_RESULT_CAN_RECOVER; 1309 } 1310 1311 static const struct pci_error_handlers vfio_err_handlers = { 1312 .error_detected = vfio_pci_aer_err_detected, 1313 }; 1314 1315 static struct pci_driver vfio_pci_driver = { 1316 .name = "vfio-pci", 1317 .id_table = NULL, /* only dynamic ids */ 1318 .probe = vfio_pci_probe, 1319 .remove = vfio_pci_remove, 1320 .err_handler = &vfio_err_handlers, 1321 }; 1322 1323 struct vfio_devices { 1324 struct vfio_device **devices; 1325 int cur_index; 1326 int max_index; 1327 }; 1328 1329 static int vfio_pci_get_devs(struct pci_dev *pdev, void *data) 1330 { 1331 struct vfio_devices *devs = data; 1332 struct vfio_device *device; 1333 1334 if (devs->cur_index == devs->max_index) 1335 return -ENOSPC; 1336 1337 device = vfio_device_get_from_dev(&pdev->dev); 1338 if (!device) 1339 return -EINVAL; 1340 1341 if (pci_dev_driver(pdev) != &vfio_pci_driver) { 1342 vfio_device_put(device); 1343 return -EBUSY; 1344 } 1345 1346 devs->devices[devs->cur_index++] = device; 1347 return 0; 1348 } 1349 1350 /* 1351 * Attempt to do a bus/slot reset if there are devices affected by a reset for 1352 * this device that are needs_reset and all of the affected devices are unused 1353 * (!refcnt). Callers are required to hold driver_lock when calling this to 1354 * prevent device opens and concurrent bus reset attempts. We prevent device 1355 * unbinds by acquiring and holding a reference to the vfio_device. 1356 * 1357 * NB: vfio-core considers a group to be viable even if some devices are 1358 * bound to drivers like pci-stub or pcieport. Here we require all devices 1359 * to be bound to vfio_pci since that's the only way we can be sure they 1360 * stay put. 1361 */ 1362 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev) 1363 { 1364 struct vfio_devices devs = { .cur_index = 0 }; 1365 int i = 0, ret = -EINVAL; 1366 bool needs_reset = false, slot = false; 1367 struct vfio_pci_device *tmp; 1368 1369 if (!pci_probe_reset_slot(vdev->pdev->slot)) 1370 slot = true; 1371 else if (pci_probe_reset_bus(vdev->pdev->bus)) 1372 return; 1373 1374 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs, 1375 &i, slot) || !i) 1376 return; 1377 1378 devs.max_index = i; 1379 devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL); 1380 if (!devs.devices) 1381 return; 1382 1383 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, 1384 vfio_pci_get_devs, &devs, slot)) 1385 goto put_devs; 1386 1387 for (i = 0; i < devs.cur_index; i++) { 1388 tmp = vfio_device_data(devs.devices[i]); 1389 if (tmp->needs_reset) 1390 needs_reset = true; 1391 if (tmp->refcnt) 1392 goto put_devs; 1393 } 1394 1395 if (needs_reset) 1396 ret = pci_reset_bus(vdev->pdev); 1397 1398 put_devs: 1399 for (i = 0; i < devs.cur_index; i++) { 1400 tmp = vfio_device_data(devs.devices[i]); 1401 if (!ret) 1402 tmp->needs_reset = false; 1403 1404 if (!tmp->refcnt && !disable_idle_d3) 1405 pci_set_power_state(tmp->pdev, PCI_D3hot); 1406 1407 vfio_device_put(devs.devices[i]); 1408 } 1409 1410 kfree(devs.devices); 1411 } 1412 1413 static void __exit vfio_pci_cleanup(void) 1414 { 1415 pci_unregister_driver(&vfio_pci_driver); 1416 vfio_pci_uninit_perm_bits(); 1417 } 1418 1419 static void __init vfio_pci_fill_ids(void) 1420 { 1421 char *p, *id; 1422 int rc; 1423 1424 /* no ids passed actually */ 1425 if (ids[0] == '\0') 1426 return; 1427 1428 /* add ids specified in the module parameter */ 1429 p = ids; 1430 while ((id = strsep(&p, ","))) { 1431 unsigned int vendor, device, subvendor = PCI_ANY_ID, 1432 subdevice = PCI_ANY_ID, class = 0, class_mask = 0; 1433 int fields; 1434 1435 if (!strlen(id)) 1436 continue; 1437 1438 fields = sscanf(id, "%x:%x:%x:%x:%x:%x", 1439 &vendor, &device, &subvendor, &subdevice, 1440 &class, &class_mask); 1441 1442 if (fields < 2) { 1443 pr_warn("invalid id string \"%s\"\n", id); 1444 continue; 1445 } 1446 1447 rc = pci_add_dynid(&vfio_pci_driver, vendor, device, 1448 subvendor, subdevice, class, class_mask, 0); 1449 if (rc) 1450 pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n", 1451 vendor, device, subvendor, subdevice, 1452 class, class_mask, rc); 1453 else 1454 pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n", 1455 vendor, device, subvendor, subdevice, 1456 class, class_mask); 1457 } 1458 } 1459 1460 static int __init vfio_pci_init(void) 1461 { 1462 int ret; 1463 1464 /* Allocate shared config space permision data used by all devices */ 1465 ret = vfio_pci_init_perm_bits(); 1466 if (ret) 1467 return ret; 1468 1469 /* Register and scan for devices */ 1470 ret = pci_register_driver(&vfio_pci_driver); 1471 if (ret) 1472 goto out_driver; 1473 1474 vfio_pci_fill_ids(); 1475 1476 return 0; 1477 1478 out_driver: 1479 vfio_pci_uninit_perm_bits(); 1480 return ret; 1481 } 1482 1483 module_init(vfio_pci_init); 1484 module_exit(vfio_pci_cleanup); 1485 1486 MODULE_VERSION(DRIVER_VERSION); 1487 MODULE_LICENSE("GPL v2"); 1488 MODULE_AUTHOR(DRIVER_AUTHOR); 1489 MODULE_DESCRIPTION(DRIVER_DESC); 1490