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) 10/20/40GbE NICs */ 199 case 0x1572: 200 case 0x1574: 201 case 0x1580 ... 0x1581: 202 case 0x1583 ... 0x1589: 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 vdev->reset_works = (pci_reset_function(pdev) == 0); 230 pci_save_state(pdev); 231 vdev->pci_saved_state = pci_store_saved_state(pdev); 232 if (!vdev->pci_saved_state) 233 pr_debug("%s: Couldn't store %s saved state\n", 234 __func__, dev_name(&pdev->dev)); 235 236 if (likely(!nointxmask)) { 237 if (vfio_pci_nointx(pdev)) { 238 dev_info(&pdev->dev, "Masking broken INTx support\n"); 239 vdev->nointx = true; 240 pci_intx(pdev, 0); 241 } else 242 vdev->pci_2_3 = pci_intx_mask_supported(pdev); 243 } 244 245 pci_read_config_word(pdev, PCI_COMMAND, &cmd); 246 if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) { 247 cmd &= ~PCI_COMMAND_INTX_DISABLE; 248 pci_write_config_word(pdev, PCI_COMMAND, cmd); 249 } 250 251 ret = vfio_config_init(vdev); 252 if (ret) { 253 kfree(vdev->pci_saved_state); 254 vdev->pci_saved_state = NULL; 255 pci_disable_device(pdev); 256 return ret; 257 } 258 259 msix_pos = pdev->msix_cap; 260 if (msix_pos) { 261 u16 flags; 262 u32 table; 263 264 pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags); 265 pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table); 266 267 vdev->msix_bar = table & PCI_MSIX_TABLE_BIR; 268 vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET; 269 vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16; 270 } else 271 vdev->msix_bar = 0xFF; 272 273 if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev)) 274 vdev->has_vga = true; 275 276 277 if (vfio_pci_is_vga(pdev) && 278 pdev->vendor == PCI_VENDOR_ID_INTEL && 279 IS_ENABLED(CONFIG_VFIO_PCI_IGD)) { 280 ret = vfio_pci_igd_init(vdev); 281 if (ret) { 282 dev_warn(&vdev->pdev->dev, 283 "Failed to setup Intel IGD regions\n"); 284 vfio_pci_disable(vdev); 285 return ret; 286 } 287 } 288 289 vfio_pci_probe_mmaps(vdev); 290 291 return 0; 292 } 293 294 static void vfio_pci_disable(struct vfio_pci_device *vdev) 295 { 296 struct pci_dev *pdev = vdev->pdev; 297 struct vfio_pci_dummy_resource *dummy_res, *tmp; 298 int i, bar; 299 300 /* Stop the device from further DMA */ 301 pci_clear_master(pdev); 302 303 vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE | 304 VFIO_IRQ_SET_ACTION_TRIGGER, 305 vdev->irq_type, 0, 0, NULL); 306 307 vdev->virq_disabled = false; 308 309 for (i = 0; i < vdev->num_regions; i++) 310 vdev->region[i].ops->release(vdev, &vdev->region[i]); 311 312 vdev->num_regions = 0; 313 kfree(vdev->region); 314 vdev->region = NULL; /* don't krealloc a freed pointer */ 315 316 vfio_config_free(vdev); 317 318 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { 319 if (!vdev->barmap[bar]) 320 continue; 321 pci_iounmap(pdev, vdev->barmap[bar]); 322 pci_release_selected_regions(pdev, 1 << bar); 323 vdev->barmap[bar] = NULL; 324 } 325 326 list_for_each_entry_safe(dummy_res, tmp, 327 &vdev->dummy_resources_list, res_next) { 328 list_del(&dummy_res->res_next); 329 release_resource(&dummy_res->resource); 330 kfree(dummy_res); 331 } 332 333 vdev->needs_reset = true; 334 335 /* 336 * If we have saved state, restore it. If we can reset the device, 337 * even better. Resetting with current state seems better than 338 * nothing, but saving and restoring current state without reset 339 * is just busy work. 340 */ 341 if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) { 342 pr_info("%s: Couldn't reload %s saved state\n", 343 __func__, dev_name(&pdev->dev)); 344 345 if (!vdev->reset_works) 346 goto out; 347 348 pci_save_state(pdev); 349 } 350 351 /* 352 * Disable INTx and MSI, presumably to avoid spurious interrupts 353 * during reset. Stolen from pci_reset_function() 354 */ 355 pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE); 356 357 /* 358 * Try to reset the device. The success of this is dependent on 359 * being able to lock the device, which is not always possible. 360 */ 361 if (vdev->reset_works && !pci_try_reset_function(pdev)) 362 vdev->needs_reset = false; 363 364 pci_restore_state(pdev); 365 out: 366 pci_disable_device(pdev); 367 368 vfio_pci_try_bus_reset(vdev); 369 370 if (!disable_idle_d3) 371 pci_set_power_state(pdev, PCI_D3hot); 372 } 373 374 static void vfio_pci_release(void *device_data) 375 { 376 struct vfio_pci_device *vdev = device_data; 377 378 mutex_lock(&driver_lock); 379 380 if (!(--vdev->refcnt)) { 381 vfio_spapr_pci_eeh_release(vdev->pdev); 382 vfio_pci_disable(vdev); 383 } 384 385 mutex_unlock(&driver_lock); 386 387 module_put(THIS_MODULE); 388 } 389 390 static int vfio_pci_open(void *device_data) 391 { 392 struct vfio_pci_device *vdev = device_data; 393 int ret = 0; 394 395 if (!try_module_get(THIS_MODULE)) 396 return -ENODEV; 397 398 mutex_lock(&driver_lock); 399 400 if (!vdev->refcnt) { 401 ret = vfio_pci_enable(vdev); 402 if (ret) 403 goto error; 404 405 vfio_spapr_pci_eeh_open(vdev->pdev); 406 } 407 vdev->refcnt++; 408 error: 409 mutex_unlock(&driver_lock); 410 if (ret) 411 module_put(THIS_MODULE); 412 return ret; 413 } 414 415 static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type) 416 { 417 if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) { 418 u8 pin; 419 pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin); 420 if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && !vdev->nointx && pin) 421 return 1; 422 423 } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) { 424 u8 pos; 425 u16 flags; 426 427 pos = vdev->pdev->msi_cap; 428 if (pos) { 429 pci_read_config_word(vdev->pdev, 430 pos + PCI_MSI_FLAGS, &flags); 431 return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1); 432 } 433 } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) { 434 u8 pos; 435 u16 flags; 436 437 pos = vdev->pdev->msix_cap; 438 if (pos) { 439 pci_read_config_word(vdev->pdev, 440 pos + PCI_MSIX_FLAGS, &flags); 441 442 return (flags & PCI_MSIX_FLAGS_QSIZE) + 1; 443 } 444 } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) { 445 if (pci_is_pcie(vdev->pdev)) 446 return 1; 447 } else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) { 448 return 1; 449 } 450 451 return 0; 452 } 453 454 static int vfio_pci_count_devs(struct pci_dev *pdev, void *data) 455 { 456 (*(int *)data)++; 457 return 0; 458 } 459 460 struct vfio_pci_fill_info { 461 int max; 462 int cur; 463 struct vfio_pci_dependent_device *devices; 464 }; 465 466 static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data) 467 { 468 struct vfio_pci_fill_info *fill = data; 469 struct iommu_group *iommu_group; 470 471 if (fill->cur == fill->max) 472 return -EAGAIN; /* Something changed, try again */ 473 474 iommu_group = iommu_group_get(&pdev->dev); 475 if (!iommu_group) 476 return -EPERM; /* Cannot reset non-isolated devices */ 477 478 fill->devices[fill->cur].group_id = iommu_group_id(iommu_group); 479 fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus); 480 fill->devices[fill->cur].bus = pdev->bus->number; 481 fill->devices[fill->cur].devfn = pdev->devfn; 482 fill->cur++; 483 iommu_group_put(iommu_group); 484 return 0; 485 } 486 487 struct vfio_pci_group_entry { 488 struct vfio_group *group; 489 int id; 490 }; 491 492 struct vfio_pci_group_info { 493 int count; 494 struct vfio_pci_group_entry *groups; 495 }; 496 497 static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data) 498 { 499 struct vfio_pci_group_info *info = data; 500 struct iommu_group *group; 501 int id, i; 502 503 group = iommu_group_get(&pdev->dev); 504 if (!group) 505 return -EPERM; 506 507 id = iommu_group_id(group); 508 509 for (i = 0; i < info->count; i++) 510 if (info->groups[i].id == id) 511 break; 512 513 iommu_group_put(group); 514 515 return (i == info->count) ? -EINVAL : 0; 516 } 517 518 static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot) 519 { 520 for (; pdev; pdev = pdev->bus->self) 521 if (pdev->bus == slot->bus) 522 return (pdev->slot == slot); 523 return false; 524 } 525 526 struct vfio_pci_walk_info { 527 int (*fn)(struct pci_dev *, void *data); 528 void *data; 529 struct pci_dev *pdev; 530 bool slot; 531 int ret; 532 }; 533 534 static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data) 535 { 536 struct vfio_pci_walk_info *walk = data; 537 538 if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot)) 539 walk->ret = walk->fn(pdev, walk->data); 540 541 return walk->ret; 542 } 543 544 static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev, 545 int (*fn)(struct pci_dev *, 546 void *data), void *data, 547 bool slot) 548 { 549 struct vfio_pci_walk_info walk = { 550 .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0, 551 }; 552 553 pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk); 554 555 return walk.ret; 556 } 557 558 static int msix_sparse_mmap_cap(struct vfio_pci_device *vdev, 559 struct vfio_info_cap *caps) 560 { 561 struct vfio_info_cap_header *header; 562 struct vfio_region_info_cap_sparse_mmap *sparse; 563 size_t end, size; 564 int nr_areas = 2, i = 0; 565 566 end = pci_resource_len(vdev->pdev, vdev->msix_bar); 567 568 /* If MSI-X table is aligned to the start or end, only one area */ 569 if (((vdev->msix_offset & PAGE_MASK) == 0) || 570 (PAGE_ALIGN(vdev->msix_offset + vdev->msix_size) >= end)) 571 nr_areas = 1; 572 573 size = sizeof(*sparse) + (nr_areas * sizeof(*sparse->areas)); 574 575 header = vfio_info_cap_add(caps, size, 576 VFIO_REGION_INFO_CAP_SPARSE_MMAP, 1); 577 if (IS_ERR(header)) 578 return PTR_ERR(header); 579 580 sparse = container_of(header, 581 struct vfio_region_info_cap_sparse_mmap, header); 582 sparse->nr_areas = nr_areas; 583 584 if (vdev->msix_offset & PAGE_MASK) { 585 sparse->areas[i].offset = 0; 586 sparse->areas[i].size = vdev->msix_offset & PAGE_MASK; 587 i++; 588 } 589 590 if (PAGE_ALIGN(vdev->msix_offset + vdev->msix_size) < end) { 591 sparse->areas[i].offset = PAGE_ALIGN(vdev->msix_offset + 592 vdev->msix_size); 593 sparse->areas[i].size = end - sparse->areas[i].offset; 594 i++; 595 } 596 597 return 0; 598 } 599 600 static int region_type_cap(struct vfio_pci_device *vdev, 601 struct vfio_info_cap *caps, 602 unsigned int type, unsigned int subtype) 603 { 604 struct vfio_info_cap_header *header; 605 struct vfio_region_info_cap_type *cap; 606 607 header = vfio_info_cap_add(caps, sizeof(*cap), 608 VFIO_REGION_INFO_CAP_TYPE, 1); 609 if (IS_ERR(header)) 610 return PTR_ERR(header); 611 612 cap = container_of(header, struct vfio_region_info_cap_type, header); 613 cap->type = type; 614 cap->subtype = subtype; 615 616 return 0; 617 } 618 619 int vfio_pci_register_dev_region(struct vfio_pci_device *vdev, 620 unsigned int type, unsigned int subtype, 621 const struct vfio_pci_regops *ops, 622 size_t size, u32 flags, void *data) 623 { 624 struct vfio_pci_region *region; 625 626 region = krealloc(vdev->region, 627 (vdev->num_regions + 1) * sizeof(*region), 628 GFP_KERNEL); 629 if (!region) 630 return -ENOMEM; 631 632 vdev->region = region; 633 vdev->region[vdev->num_regions].type = type; 634 vdev->region[vdev->num_regions].subtype = subtype; 635 vdev->region[vdev->num_regions].ops = ops; 636 vdev->region[vdev->num_regions].size = size; 637 vdev->region[vdev->num_regions].flags = flags; 638 vdev->region[vdev->num_regions].data = data; 639 640 vdev->num_regions++; 641 642 return 0; 643 } 644 645 static long vfio_pci_ioctl(void *device_data, 646 unsigned int cmd, unsigned long arg) 647 { 648 struct vfio_pci_device *vdev = device_data; 649 unsigned long minsz; 650 651 if (cmd == VFIO_DEVICE_GET_INFO) { 652 struct vfio_device_info info; 653 654 minsz = offsetofend(struct vfio_device_info, num_irqs); 655 656 if (copy_from_user(&info, (void __user *)arg, minsz)) 657 return -EFAULT; 658 659 if (info.argsz < minsz) 660 return -EINVAL; 661 662 info.flags = VFIO_DEVICE_FLAGS_PCI; 663 664 if (vdev->reset_works) 665 info.flags |= VFIO_DEVICE_FLAGS_RESET; 666 667 info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions; 668 info.num_irqs = VFIO_PCI_NUM_IRQS; 669 670 return copy_to_user((void __user *)arg, &info, minsz) ? 671 -EFAULT : 0; 672 673 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { 674 struct pci_dev *pdev = vdev->pdev; 675 struct vfio_region_info info; 676 struct vfio_info_cap caps = { .buf = NULL, .size = 0 }; 677 int i, ret; 678 679 minsz = offsetofend(struct vfio_region_info, offset); 680 681 if (copy_from_user(&info, (void __user *)arg, minsz)) 682 return -EFAULT; 683 684 if (info.argsz < minsz) 685 return -EINVAL; 686 687 switch (info.index) { 688 case VFIO_PCI_CONFIG_REGION_INDEX: 689 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 690 info.size = pdev->cfg_size; 691 info.flags = VFIO_REGION_INFO_FLAG_READ | 692 VFIO_REGION_INFO_FLAG_WRITE; 693 break; 694 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: 695 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 696 info.size = pci_resource_len(pdev, info.index); 697 if (!info.size) { 698 info.flags = 0; 699 break; 700 } 701 702 info.flags = VFIO_REGION_INFO_FLAG_READ | 703 VFIO_REGION_INFO_FLAG_WRITE; 704 if (vdev->bar_mmap_supported[info.index]) { 705 info.flags |= VFIO_REGION_INFO_FLAG_MMAP; 706 if (info.index == vdev->msix_bar) { 707 ret = msix_sparse_mmap_cap(vdev, &caps); 708 if (ret) 709 return ret; 710 } 711 } 712 713 break; 714 case VFIO_PCI_ROM_REGION_INDEX: 715 { 716 void __iomem *io; 717 size_t size; 718 719 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 720 info.flags = 0; 721 722 /* Report the BAR size, not the ROM size */ 723 info.size = pci_resource_len(pdev, info.index); 724 if (!info.size) { 725 /* Shadow ROMs appear as PCI option ROMs */ 726 if (pdev->resource[PCI_ROM_RESOURCE].flags & 727 IORESOURCE_ROM_SHADOW) 728 info.size = 0x20000; 729 else 730 break; 731 } 732 733 /* Is it really there? */ 734 io = pci_map_rom(pdev, &size); 735 if (!io || !size) { 736 info.size = 0; 737 break; 738 } 739 pci_unmap_rom(pdev, io); 740 741 info.flags = VFIO_REGION_INFO_FLAG_READ; 742 break; 743 } 744 case VFIO_PCI_VGA_REGION_INDEX: 745 if (!vdev->has_vga) 746 return -EINVAL; 747 748 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 749 info.size = 0xc0000; 750 info.flags = VFIO_REGION_INFO_FLAG_READ | 751 VFIO_REGION_INFO_FLAG_WRITE; 752 753 break; 754 default: 755 if (info.index >= 756 VFIO_PCI_NUM_REGIONS + vdev->num_regions) 757 return -EINVAL; 758 759 i = info.index - VFIO_PCI_NUM_REGIONS; 760 761 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 762 info.size = vdev->region[i].size; 763 info.flags = vdev->region[i].flags; 764 765 ret = region_type_cap(vdev, &caps, 766 vdev->region[i].type, 767 vdev->region[i].subtype); 768 if (ret) 769 return ret; 770 } 771 772 if (caps.size) { 773 info.flags |= VFIO_REGION_INFO_FLAG_CAPS; 774 if (info.argsz < sizeof(info) + caps.size) { 775 info.argsz = sizeof(info) + caps.size; 776 info.cap_offset = 0; 777 } else { 778 vfio_info_cap_shift(&caps, sizeof(info)); 779 if (copy_to_user((void __user *)arg + 780 sizeof(info), caps.buf, 781 caps.size)) { 782 kfree(caps.buf); 783 return -EFAULT; 784 } 785 info.cap_offset = sizeof(info); 786 } 787 788 kfree(caps.buf); 789 } 790 791 return copy_to_user((void __user *)arg, &info, minsz) ? 792 -EFAULT : 0; 793 794 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { 795 struct vfio_irq_info info; 796 797 minsz = offsetofend(struct vfio_irq_info, count); 798 799 if (copy_from_user(&info, (void __user *)arg, minsz)) 800 return -EFAULT; 801 802 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS) 803 return -EINVAL; 804 805 switch (info.index) { 806 case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX: 807 case VFIO_PCI_REQ_IRQ_INDEX: 808 break; 809 case VFIO_PCI_ERR_IRQ_INDEX: 810 if (pci_is_pcie(vdev->pdev)) 811 break; 812 /* pass thru to return error */ 813 default: 814 return -EINVAL; 815 } 816 817 info.flags = VFIO_IRQ_INFO_EVENTFD; 818 819 info.count = vfio_pci_get_irq_count(vdev, info.index); 820 821 if (info.index == VFIO_PCI_INTX_IRQ_INDEX) 822 info.flags |= (VFIO_IRQ_INFO_MASKABLE | 823 VFIO_IRQ_INFO_AUTOMASKED); 824 else 825 info.flags |= VFIO_IRQ_INFO_NORESIZE; 826 827 return copy_to_user((void __user *)arg, &info, minsz) ? 828 -EFAULT : 0; 829 830 } else if (cmd == VFIO_DEVICE_SET_IRQS) { 831 struct vfio_irq_set hdr; 832 size_t size; 833 u8 *data = NULL; 834 int max, ret = 0; 835 836 minsz = offsetofend(struct vfio_irq_set, count); 837 838 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 839 return -EFAULT; 840 841 if (hdr.argsz < minsz || hdr.index >= VFIO_PCI_NUM_IRQS || 842 hdr.count >= (U32_MAX - hdr.start) || 843 hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK | 844 VFIO_IRQ_SET_ACTION_TYPE_MASK)) 845 return -EINVAL; 846 847 max = vfio_pci_get_irq_count(vdev, hdr.index); 848 if (hdr.start >= max || hdr.start + hdr.count > max) 849 return -EINVAL; 850 851 switch (hdr.flags & VFIO_IRQ_SET_DATA_TYPE_MASK) { 852 case VFIO_IRQ_SET_DATA_NONE: 853 size = 0; 854 break; 855 case VFIO_IRQ_SET_DATA_BOOL: 856 size = sizeof(uint8_t); 857 break; 858 case VFIO_IRQ_SET_DATA_EVENTFD: 859 size = sizeof(int32_t); 860 break; 861 default: 862 return -EINVAL; 863 } 864 865 if (size) { 866 if (hdr.argsz - minsz < hdr.count * size) 867 return -EINVAL; 868 869 data = memdup_user((void __user *)(arg + minsz), 870 hdr.count * size); 871 if (IS_ERR(data)) 872 return PTR_ERR(data); 873 } 874 875 mutex_lock(&vdev->igate); 876 877 ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index, 878 hdr.start, hdr.count, data); 879 880 mutex_unlock(&vdev->igate); 881 kfree(data); 882 883 return ret; 884 885 } else if (cmd == VFIO_DEVICE_RESET) { 886 return vdev->reset_works ? 887 pci_try_reset_function(vdev->pdev) : -EINVAL; 888 889 } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) { 890 struct vfio_pci_hot_reset_info hdr; 891 struct vfio_pci_fill_info fill = { 0 }; 892 struct vfio_pci_dependent_device *devices = NULL; 893 bool slot = false; 894 int ret = 0; 895 896 minsz = offsetofend(struct vfio_pci_hot_reset_info, count); 897 898 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 899 return -EFAULT; 900 901 if (hdr.argsz < minsz) 902 return -EINVAL; 903 904 hdr.flags = 0; 905 906 /* Can we do a slot or bus reset or neither? */ 907 if (!pci_probe_reset_slot(vdev->pdev->slot)) 908 slot = true; 909 else if (pci_probe_reset_bus(vdev->pdev->bus)) 910 return -ENODEV; 911 912 /* How many devices are affected? */ 913 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 914 vfio_pci_count_devs, 915 &fill.max, slot); 916 if (ret) 917 return ret; 918 919 WARN_ON(!fill.max); /* Should always be at least one */ 920 921 /* 922 * If there's enough space, fill it now, otherwise return 923 * -ENOSPC and the number of devices affected. 924 */ 925 if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) { 926 ret = -ENOSPC; 927 hdr.count = fill.max; 928 goto reset_info_exit; 929 } 930 931 devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL); 932 if (!devices) 933 return -ENOMEM; 934 935 fill.devices = devices; 936 937 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 938 vfio_pci_fill_devs, 939 &fill, slot); 940 941 /* 942 * If a device was removed between counting and filling, 943 * we may come up short of fill.max. If a device was 944 * added, we'll have a return of -EAGAIN above. 945 */ 946 if (!ret) 947 hdr.count = fill.cur; 948 949 reset_info_exit: 950 if (copy_to_user((void __user *)arg, &hdr, minsz)) 951 ret = -EFAULT; 952 953 if (!ret) { 954 if (copy_to_user((void __user *)(arg + minsz), devices, 955 hdr.count * sizeof(*devices))) 956 ret = -EFAULT; 957 } 958 959 kfree(devices); 960 return ret; 961 962 } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) { 963 struct vfio_pci_hot_reset hdr; 964 int32_t *group_fds; 965 struct vfio_pci_group_entry *groups; 966 struct vfio_pci_group_info info; 967 bool slot = false; 968 int i, count = 0, ret = 0; 969 970 minsz = offsetofend(struct vfio_pci_hot_reset, count); 971 972 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 973 return -EFAULT; 974 975 if (hdr.argsz < minsz || hdr.flags) 976 return -EINVAL; 977 978 /* Can we do a slot or bus reset or neither? */ 979 if (!pci_probe_reset_slot(vdev->pdev->slot)) 980 slot = true; 981 else if (pci_probe_reset_bus(vdev->pdev->bus)) 982 return -ENODEV; 983 984 /* 985 * We can't let userspace give us an arbitrarily large 986 * buffer to copy, so verify how many we think there 987 * could be. Note groups can have multiple devices so 988 * one group per device is the max. 989 */ 990 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 991 vfio_pci_count_devs, 992 &count, slot); 993 if (ret) 994 return ret; 995 996 /* Somewhere between 1 and count is OK */ 997 if (!hdr.count || hdr.count > count) 998 return -EINVAL; 999 1000 group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL); 1001 groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL); 1002 if (!group_fds || !groups) { 1003 kfree(group_fds); 1004 kfree(groups); 1005 return -ENOMEM; 1006 } 1007 1008 if (copy_from_user(group_fds, (void __user *)(arg + minsz), 1009 hdr.count * sizeof(*group_fds))) { 1010 kfree(group_fds); 1011 kfree(groups); 1012 return -EFAULT; 1013 } 1014 1015 /* 1016 * For each group_fd, get the group through the vfio external 1017 * user interface and store the group and iommu ID. This 1018 * ensures the group is held across the reset. 1019 */ 1020 for (i = 0; i < hdr.count; i++) { 1021 struct vfio_group *group; 1022 struct fd f = fdget(group_fds[i]); 1023 if (!f.file) { 1024 ret = -EBADF; 1025 break; 1026 } 1027 1028 group = vfio_group_get_external_user(f.file); 1029 fdput(f); 1030 if (IS_ERR(group)) { 1031 ret = PTR_ERR(group); 1032 break; 1033 } 1034 1035 groups[i].group = group; 1036 groups[i].id = vfio_external_user_iommu_id(group); 1037 } 1038 1039 kfree(group_fds); 1040 1041 /* release reference to groups on error */ 1042 if (ret) 1043 goto hot_reset_release; 1044 1045 info.count = hdr.count; 1046 info.groups = groups; 1047 1048 /* 1049 * Test whether all the affected devices are contained 1050 * by the set of groups provided by the user. 1051 */ 1052 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 1053 vfio_pci_validate_devs, 1054 &info, slot); 1055 if (!ret) 1056 /* User has access, do the reset */ 1057 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : 1058 pci_try_reset_bus(vdev->pdev->bus); 1059 1060 hot_reset_release: 1061 for (i--; i >= 0; i--) 1062 vfio_group_put_external_user(groups[i].group); 1063 1064 kfree(groups); 1065 return ret; 1066 } 1067 1068 return -ENOTTY; 1069 } 1070 1071 static ssize_t vfio_pci_rw(void *device_data, char __user *buf, 1072 size_t count, loff_t *ppos, bool iswrite) 1073 { 1074 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos); 1075 struct vfio_pci_device *vdev = device_data; 1076 1077 if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions) 1078 return -EINVAL; 1079 1080 switch (index) { 1081 case VFIO_PCI_CONFIG_REGION_INDEX: 1082 return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite); 1083 1084 case VFIO_PCI_ROM_REGION_INDEX: 1085 if (iswrite) 1086 return -EINVAL; 1087 return vfio_pci_bar_rw(vdev, buf, count, ppos, false); 1088 1089 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: 1090 return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite); 1091 1092 case VFIO_PCI_VGA_REGION_INDEX: 1093 return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite); 1094 default: 1095 index -= VFIO_PCI_NUM_REGIONS; 1096 return vdev->region[index].ops->rw(vdev, buf, 1097 count, ppos, iswrite); 1098 } 1099 1100 return -EINVAL; 1101 } 1102 1103 static ssize_t vfio_pci_read(void *device_data, char __user *buf, 1104 size_t count, loff_t *ppos) 1105 { 1106 if (!count) 1107 return 0; 1108 1109 return vfio_pci_rw(device_data, buf, count, ppos, false); 1110 } 1111 1112 static ssize_t vfio_pci_write(void *device_data, const char __user *buf, 1113 size_t count, loff_t *ppos) 1114 { 1115 if (!count) 1116 return 0; 1117 1118 return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true); 1119 } 1120 1121 static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma) 1122 { 1123 struct vfio_pci_device *vdev = device_data; 1124 struct pci_dev *pdev = vdev->pdev; 1125 unsigned int index; 1126 u64 phys_len, req_len, pgoff, req_start; 1127 int ret; 1128 1129 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); 1130 1131 if (vma->vm_end < vma->vm_start) 1132 return -EINVAL; 1133 if ((vma->vm_flags & VM_SHARED) == 0) 1134 return -EINVAL; 1135 if (index >= VFIO_PCI_ROM_REGION_INDEX) 1136 return -EINVAL; 1137 if (!vdev->bar_mmap_supported[index]) 1138 return -EINVAL; 1139 1140 phys_len = PAGE_ALIGN(pci_resource_len(pdev, index)); 1141 req_len = vma->vm_end - vma->vm_start; 1142 pgoff = vma->vm_pgoff & 1143 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1); 1144 req_start = pgoff << PAGE_SHIFT; 1145 1146 if (req_start + req_len > phys_len) 1147 return -EINVAL; 1148 1149 if (index == vdev->msix_bar) { 1150 /* 1151 * Disallow mmaps overlapping the MSI-X table; users don't 1152 * get to touch this directly. We could find somewhere 1153 * else to map the overlap, but page granularity is only 1154 * a recommendation, not a requirement, so the user needs 1155 * to know which bits are real. Requiring them to mmap 1156 * around the table makes that clear. 1157 */ 1158 1159 /* If neither entirely above nor below, then it overlaps */ 1160 if (!(req_start >= vdev->msix_offset + vdev->msix_size || 1161 req_start + req_len <= vdev->msix_offset)) 1162 return -EINVAL; 1163 } 1164 1165 /* 1166 * Even though we don't make use of the barmap for the mmap, 1167 * we need to request the region and the barmap tracks that. 1168 */ 1169 if (!vdev->barmap[index]) { 1170 ret = pci_request_selected_regions(pdev, 1171 1 << index, "vfio-pci"); 1172 if (ret) 1173 return ret; 1174 1175 vdev->barmap[index] = pci_iomap(pdev, index, 0); 1176 } 1177 1178 vma->vm_private_data = vdev; 1179 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1180 vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff; 1181 1182 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, 1183 req_len, vma->vm_page_prot); 1184 } 1185 1186 static void vfio_pci_request(void *device_data, unsigned int count) 1187 { 1188 struct vfio_pci_device *vdev = device_data; 1189 1190 mutex_lock(&vdev->igate); 1191 1192 if (vdev->req_trigger) { 1193 if (!(count % 10)) 1194 dev_notice_ratelimited(&vdev->pdev->dev, 1195 "Relaying device request to user (#%u)\n", 1196 count); 1197 eventfd_signal(vdev->req_trigger, 1); 1198 } else if (count == 0) { 1199 dev_warn(&vdev->pdev->dev, 1200 "No device request channel registered, blocked until released by user\n"); 1201 } 1202 1203 mutex_unlock(&vdev->igate); 1204 } 1205 1206 static const struct vfio_device_ops vfio_pci_ops = { 1207 .name = "vfio-pci", 1208 .open = vfio_pci_open, 1209 .release = vfio_pci_release, 1210 .ioctl = vfio_pci_ioctl, 1211 .read = vfio_pci_read, 1212 .write = vfio_pci_write, 1213 .mmap = vfio_pci_mmap, 1214 .request = vfio_pci_request, 1215 }; 1216 1217 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 1218 { 1219 struct vfio_pci_device *vdev; 1220 struct iommu_group *group; 1221 int ret; 1222 1223 if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL) 1224 return -EINVAL; 1225 1226 group = vfio_iommu_group_get(&pdev->dev); 1227 if (!group) 1228 return -EINVAL; 1229 1230 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 1231 if (!vdev) { 1232 vfio_iommu_group_put(group, &pdev->dev); 1233 return -ENOMEM; 1234 } 1235 1236 vdev->pdev = pdev; 1237 vdev->irq_type = VFIO_PCI_NUM_IRQS; 1238 mutex_init(&vdev->igate); 1239 spin_lock_init(&vdev->irqlock); 1240 1241 ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev); 1242 if (ret) { 1243 vfio_iommu_group_put(group, &pdev->dev); 1244 kfree(vdev); 1245 return ret; 1246 } 1247 1248 if (vfio_pci_is_vga(pdev)) { 1249 vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode); 1250 vga_set_legacy_decoding(pdev, 1251 vfio_pci_set_vga_decode(vdev, false)); 1252 } 1253 1254 if (!disable_idle_d3) { 1255 /* 1256 * pci-core sets the device power state to an unknown value at 1257 * bootup and after being removed from a driver. The only 1258 * transition it allows from this unknown state is to D0, which 1259 * typically happens when a driver calls pci_enable_device(). 1260 * We're not ready to enable the device yet, but we do want to 1261 * be able to get to D3. Therefore first do a D0 transition 1262 * before going to D3. 1263 */ 1264 pci_set_power_state(pdev, PCI_D0); 1265 pci_set_power_state(pdev, PCI_D3hot); 1266 } 1267 1268 return ret; 1269 } 1270 1271 static void vfio_pci_remove(struct pci_dev *pdev) 1272 { 1273 struct vfio_pci_device *vdev; 1274 1275 vdev = vfio_del_group_dev(&pdev->dev); 1276 if (!vdev) 1277 return; 1278 1279 vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev); 1280 kfree(vdev->region); 1281 kfree(vdev); 1282 1283 if (vfio_pci_is_vga(pdev)) { 1284 vga_client_register(pdev, NULL, NULL, NULL); 1285 vga_set_legacy_decoding(pdev, 1286 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | 1287 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); 1288 } 1289 1290 if (!disable_idle_d3) 1291 pci_set_power_state(pdev, PCI_D0); 1292 } 1293 1294 static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev, 1295 pci_channel_state_t state) 1296 { 1297 struct vfio_pci_device *vdev; 1298 struct vfio_device *device; 1299 1300 device = vfio_device_get_from_dev(&pdev->dev); 1301 if (device == NULL) 1302 return PCI_ERS_RESULT_DISCONNECT; 1303 1304 vdev = vfio_device_data(device); 1305 if (vdev == NULL) { 1306 vfio_device_put(device); 1307 return PCI_ERS_RESULT_DISCONNECT; 1308 } 1309 1310 mutex_lock(&vdev->igate); 1311 1312 if (vdev->err_trigger) 1313 eventfd_signal(vdev->err_trigger, 1); 1314 1315 mutex_unlock(&vdev->igate); 1316 1317 vfio_device_put(device); 1318 1319 return PCI_ERS_RESULT_CAN_RECOVER; 1320 } 1321 1322 static const struct pci_error_handlers vfio_err_handlers = { 1323 .error_detected = vfio_pci_aer_err_detected, 1324 }; 1325 1326 static struct pci_driver vfio_pci_driver = { 1327 .name = "vfio-pci", 1328 .id_table = NULL, /* only dynamic ids */ 1329 .probe = vfio_pci_probe, 1330 .remove = vfio_pci_remove, 1331 .err_handler = &vfio_err_handlers, 1332 }; 1333 1334 struct vfio_devices { 1335 struct vfio_device **devices; 1336 int cur_index; 1337 int max_index; 1338 }; 1339 1340 static int vfio_pci_get_devs(struct pci_dev *pdev, void *data) 1341 { 1342 struct vfio_devices *devs = data; 1343 struct vfio_device *device; 1344 1345 if (devs->cur_index == devs->max_index) 1346 return -ENOSPC; 1347 1348 device = vfio_device_get_from_dev(&pdev->dev); 1349 if (!device) 1350 return -EINVAL; 1351 1352 if (pci_dev_driver(pdev) != &vfio_pci_driver) { 1353 vfio_device_put(device); 1354 return -EBUSY; 1355 } 1356 1357 devs->devices[devs->cur_index++] = device; 1358 return 0; 1359 } 1360 1361 /* 1362 * Attempt to do a bus/slot reset if there are devices affected by a reset for 1363 * this device that are needs_reset and all of the affected devices are unused 1364 * (!refcnt). Callers are required to hold driver_lock when calling this to 1365 * prevent device opens and concurrent bus reset attempts. We prevent device 1366 * unbinds by acquiring and holding a reference to the vfio_device. 1367 * 1368 * NB: vfio-core considers a group to be viable even if some devices are 1369 * bound to drivers like pci-stub or pcieport. Here we require all devices 1370 * to be bound to vfio_pci since that's the only way we can be sure they 1371 * stay put. 1372 */ 1373 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev) 1374 { 1375 struct vfio_devices devs = { .cur_index = 0 }; 1376 int i = 0, ret = -EINVAL; 1377 bool needs_reset = false, slot = false; 1378 struct vfio_pci_device *tmp; 1379 1380 if (!pci_probe_reset_slot(vdev->pdev->slot)) 1381 slot = true; 1382 else if (pci_probe_reset_bus(vdev->pdev->bus)) 1383 return; 1384 1385 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs, 1386 &i, slot) || !i) 1387 return; 1388 1389 devs.max_index = i; 1390 devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL); 1391 if (!devs.devices) 1392 return; 1393 1394 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, 1395 vfio_pci_get_devs, &devs, slot)) 1396 goto put_devs; 1397 1398 for (i = 0; i < devs.cur_index; i++) { 1399 tmp = vfio_device_data(devs.devices[i]); 1400 if (tmp->needs_reset) 1401 needs_reset = true; 1402 if (tmp->refcnt) 1403 goto put_devs; 1404 } 1405 1406 if (needs_reset) 1407 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : 1408 pci_try_reset_bus(vdev->pdev->bus); 1409 1410 put_devs: 1411 for (i = 0; i < devs.cur_index; i++) { 1412 tmp = vfio_device_data(devs.devices[i]); 1413 if (!ret) 1414 tmp->needs_reset = false; 1415 1416 if (!tmp->refcnt && !disable_idle_d3) 1417 pci_set_power_state(tmp->pdev, PCI_D3hot); 1418 1419 vfio_device_put(devs.devices[i]); 1420 } 1421 1422 kfree(devs.devices); 1423 } 1424 1425 static void __exit vfio_pci_cleanup(void) 1426 { 1427 pci_unregister_driver(&vfio_pci_driver); 1428 vfio_pci_uninit_perm_bits(); 1429 } 1430 1431 static void __init vfio_pci_fill_ids(void) 1432 { 1433 char *p, *id; 1434 int rc; 1435 1436 /* no ids passed actually */ 1437 if (ids[0] == '\0') 1438 return; 1439 1440 /* add ids specified in the module parameter */ 1441 p = ids; 1442 while ((id = strsep(&p, ","))) { 1443 unsigned int vendor, device, subvendor = PCI_ANY_ID, 1444 subdevice = PCI_ANY_ID, class = 0, class_mask = 0; 1445 int fields; 1446 1447 if (!strlen(id)) 1448 continue; 1449 1450 fields = sscanf(id, "%x:%x:%x:%x:%x:%x", 1451 &vendor, &device, &subvendor, &subdevice, 1452 &class, &class_mask); 1453 1454 if (fields < 2) { 1455 pr_warn("invalid id string \"%s\"\n", id); 1456 continue; 1457 } 1458 1459 rc = pci_add_dynid(&vfio_pci_driver, vendor, device, 1460 subvendor, subdevice, class, class_mask, 0); 1461 if (rc) 1462 pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n", 1463 vendor, device, subvendor, subdevice, 1464 class, class_mask, rc); 1465 else 1466 pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n", 1467 vendor, device, subvendor, subdevice, 1468 class, class_mask); 1469 } 1470 } 1471 1472 static int __init vfio_pci_init(void) 1473 { 1474 int ret; 1475 1476 /* Allocate shared config space permision data used by all devices */ 1477 ret = vfio_pci_init_perm_bits(); 1478 if (ret) 1479 return ret; 1480 1481 /* Register and scan for devices */ 1482 ret = pci_register_driver(&vfio_pci_driver); 1483 if (ret) 1484 goto out_driver; 1485 1486 vfio_pci_fill_ids(); 1487 1488 return 0; 1489 1490 out_driver: 1491 vfio_pci_uninit_perm_bits(); 1492 return ret; 1493 } 1494 1495 module_init(vfio_pci_init); 1496 module_exit(vfio_pci_cleanup); 1497 1498 MODULE_VERSION(DRIVER_VERSION); 1499 MODULE_LICENSE("GPL v2"); 1500 MODULE_AUTHOR(DRIVER_AUTHOR); 1501 MODULE_DESCRIPTION(DRIVER_DESC); 1502