1 /* 2 * Copyright (C) 2012 Red Hat, Inc. All rights reserved. 3 * Author: Alex Williamson <alex.williamson@redhat.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Derived from original vfio: 10 * Copyright 2010 Cisco Systems, Inc. All rights reserved. 11 * Author: Tom Lyon, pugs@cisco.com 12 */ 13 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 15 16 #include <linux/device.h> 17 #include <linux/eventfd.h> 18 #include <linux/file.h> 19 #include <linux/interrupt.h> 20 #include <linux/iommu.h> 21 #include <linux/module.h> 22 #include <linux/mutex.h> 23 #include <linux/notifier.h> 24 #include <linux/pci.h> 25 #include <linux/pm_runtime.h> 26 #include <linux/slab.h> 27 #include <linux/types.h> 28 #include <linux/uaccess.h> 29 #include <linux/vfio.h> 30 #include <linux/vgaarb.h> 31 32 #include "vfio_pci_private.h" 33 34 #define DRIVER_VERSION "0.2" 35 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>" 36 #define DRIVER_DESC "VFIO PCI - User Level meta-driver" 37 38 static char ids[1024] __initdata; 39 module_param_string(ids, ids, sizeof(ids), 0); 40 MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified"); 41 42 static bool nointxmask; 43 module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR); 44 MODULE_PARM_DESC(nointxmask, 45 "Disable support for PCI 2.3 style INTx masking. If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag."); 46 47 #ifdef CONFIG_VFIO_PCI_VGA 48 static bool disable_vga; 49 module_param(disable_vga, bool, S_IRUGO); 50 MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci"); 51 #endif 52 53 static bool disable_idle_d3; 54 module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR); 55 MODULE_PARM_DESC(disable_idle_d3, 56 "Disable using the PCI D3 low power state for idle, unused devices"); 57 58 static DEFINE_MUTEX(driver_lock); 59 60 static inline bool vfio_vga_disabled(void) 61 { 62 #ifdef CONFIG_VFIO_PCI_VGA 63 return disable_vga; 64 #else 65 return true; 66 #endif 67 } 68 69 /* 70 * Our VGA arbiter participation is limited since we don't know anything 71 * about the device itself. However, if the device is the only VGA device 72 * downstream of a bridge and VFIO VGA support is disabled, then we can 73 * safely return legacy VGA IO and memory as not decoded since the user 74 * has no way to get to it and routing can be disabled externally at the 75 * bridge. 76 */ 77 static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga) 78 { 79 struct vfio_pci_device *vdev = opaque; 80 struct pci_dev *tmp = NULL, *pdev = vdev->pdev; 81 unsigned char max_busnr; 82 unsigned int decodes; 83 84 if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus)) 85 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | 86 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; 87 88 max_busnr = pci_bus_max_busnr(pdev->bus); 89 decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; 90 91 while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) { 92 if (tmp == pdev || 93 pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) || 94 pci_is_root_bus(tmp->bus)) 95 continue; 96 97 if (tmp->bus->number >= pdev->bus->number && 98 tmp->bus->number <= max_busnr) { 99 pci_dev_put(tmp); 100 decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; 101 break; 102 } 103 } 104 105 return decodes; 106 } 107 108 static inline bool vfio_pci_is_vga(struct pci_dev *pdev) 109 { 110 return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA; 111 } 112 113 static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev) 114 { 115 struct resource *res; 116 int bar; 117 struct vfio_pci_dummy_resource *dummy_res; 118 119 INIT_LIST_HEAD(&vdev->dummy_resources_list); 120 121 for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { 122 res = vdev->pdev->resource + bar; 123 124 if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP)) 125 goto no_mmap; 126 127 if (!(res->flags & IORESOURCE_MEM)) 128 goto no_mmap; 129 130 /* 131 * The PCI core shouldn't set up a resource with a 132 * type but zero size. But there may be bugs that 133 * cause us to do that. 134 */ 135 if (!resource_size(res)) 136 goto no_mmap; 137 138 if (resource_size(res) >= PAGE_SIZE) { 139 vdev->bar_mmap_supported[bar] = true; 140 continue; 141 } 142 143 if (!(res->start & ~PAGE_MASK)) { 144 /* 145 * Add a dummy resource to reserve the remainder 146 * of the exclusive page in case that hot-add 147 * device's bar is assigned into it. 148 */ 149 dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL); 150 if (dummy_res == NULL) 151 goto no_mmap; 152 153 dummy_res->resource.name = "vfio sub-page reserved"; 154 dummy_res->resource.start = res->end + 1; 155 dummy_res->resource.end = res->start + PAGE_SIZE - 1; 156 dummy_res->resource.flags = res->flags; 157 if (request_resource(res->parent, 158 &dummy_res->resource)) { 159 kfree(dummy_res); 160 goto no_mmap; 161 } 162 dummy_res->index = bar; 163 list_add(&dummy_res->res_next, 164 &vdev->dummy_resources_list); 165 vdev->bar_mmap_supported[bar] = true; 166 continue; 167 } 168 /* 169 * Here we don't handle the case when the BAR is not page 170 * aligned because we can't expect the BAR will be 171 * assigned into the same location in a page in guest 172 * when we passthrough the BAR. And it's hard to access 173 * this BAR in userspace because we have no way to get 174 * the BAR's location in a page. 175 */ 176 no_mmap: 177 vdev->bar_mmap_supported[bar] = false; 178 } 179 } 180 181 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev); 182 static void vfio_pci_disable(struct vfio_pci_device *vdev); 183 184 /* 185 * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND 186 * _and_ the ability detect when the device is asserting INTx via PCI_STATUS. 187 * If a device implements the former but not the latter we would typically 188 * expect broken_intx_masking be set and require an exclusive interrupt. 189 * However since we do have control of the device's ability to assert INTx, 190 * we can instead pretend that the device does not implement INTx, virtualizing 191 * the pin register to report zero and maintaining DisINTx set on the host. 192 */ 193 static bool vfio_pci_nointx(struct pci_dev *pdev) 194 { 195 switch (pdev->vendor) { 196 case PCI_VENDOR_ID_INTEL: 197 switch (pdev->device) { 198 /* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */ 199 case 0x1572: 200 case 0x1574: 201 case 0x1580 ... 0x1581: 202 case 0x1583 ... 0x158b: 203 case 0x37d0 ... 0x37d2: 204 return true; 205 default: 206 return false; 207 } 208 } 209 210 return false; 211 } 212 213 static int vfio_pci_enable(struct vfio_pci_device *vdev) 214 { 215 struct pci_dev *pdev = vdev->pdev; 216 int ret; 217 u16 cmd; 218 u8 msix_pos; 219 220 pci_set_power_state(pdev, PCI_D0); 221 222 /* Don't allow our initial saved state to include busmaster */ 223 pci_clear_master(pdev); 224 225 ret = pci_enable_device(pdev); 226 if (ret) 227 return ret; 228 229 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_region_info_cap_sparse_mmap *sparse; 562 size_t end, size; 563 int nr_areas = 2, i = 0, ret; 564 565 end = pci_resource_len(vdev->pdev, vdev->msix_bar); 566 567 /* If MSI-X table is aligned to the start or end, only one area */ 568 if (((vdev->msix_offset & PAGE_MASK) == 0) || 569 (PAGE_ALIGN(vdev->msix_offset + vdev->msix_size) >= end)) 570 nr_areas = 1; 571 572 size = sizeof(*sparse) + (nr_areas * sizeof(*sparse->areas)); 573 574 sparse = kzalloc(size, GFP_KERNEL); 575 if (!sparse) 576 return -ENOMEM; 577 578 sparse->nr_areas = nr_areas; 579 580 if (vdev->msix_offset & PAGE_MASK) { 581 sparse->areas[i].offset = 0; 582 sparse->areas[i].size = vdev->msix_offset & PAGE_MASK; 583 i++; 584 } 585 586 if (PAGE_ALIGN(vdev->msix_offset + vdev->msix_size) < end) { 587 sparse->areas[i].offset = PAGE_ALIGN(vdev->msix_offset + 588 vdev->msix_size); 589 sparse->areas[i].size = end - sparse->areas[i].offset; 590 i++; 591 } 592 593 ret = vfio_info_add_capability(caps, VFIO_REGION_INFO_CAP_SPARSE_MMAP, 594 sparse); 595 kfree(sparse); 596 597 return ret; 598 } 599 600 int vfio_pci_register_dev_region(struct vfio_pci_device *vdev, 601 unsigned int type, unsigned int subtype, 602 const struct vfio_pci_regops *ops, 603 size_t size, u32 flags, void *data) 604 { 605 struct vfio_pci_region *region; 606 607 region = krealloc(vdev->region, 608 (vdev->num_regions + 1) * sizeof(*region), 609 GFP_KERNEL); 610 if (!region) 611 return -ENOMEM; 612 613 vdev->region = region; 614 vdev->region[vdev->num_regions].type = type; 615 vdev->region[vdev->num_regions].subtype = subtype; 616 vdev->region[vdev->num_regions].ops = ops; 617 vdev->region[vdev->num_regions].size = size; 618 vdev->region[vdev->num_regions].flags = flags; 619 vdev->region[vdev->num_regions].data = data; 620 621 vdev->num_regions++; 622 623 return 0; 624 } 625 626 static long vfio_pci_ioctl(void *device_data, 627 unsigned int cmd, unsigned long arg) 628 { 629 struct vfio_pci_device *vdev = device_data; 630 unsigned long minsz; 631 632 if (cmd == VFIO_DEVICE_GET_INFO) { 633 struct vfio_device_info info; 634 635 minsz = offsetofend(struct vfio_device_info, num_irqs); 636 637 if (copy_from_user(&info, (void __user *)arg, minsz)) 638 return -EFAULT; 639 640 if (info.argsz < minsz) 641 return -EINVAL; 642 643 info.flags = VFIO_DEVICE_FLAGS_PCI; 644 645 if (vdev->reset_works) 646 info.flags |= VFIO_DEVICE_FLAGS_RESET; 647 648 info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions; 649 info.num_irqs = VFIO_PCI_NUM_IRQS; 650 651 return copy_to_user((void __user *)arg, &info, minsz) ? 652 -EFAULT : 0; 653 654 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { 655 struct pci_dev *pdev = vdev->pdev; 656 struct vfio_region_info info; 657 struct vfio_info_cap caps = { .buf = NULL, .size = 0 }; 658 int i, ret; 659 660 minsz = offsetofend(struct vfio_region_info, offset); 661 662 if (copy_from_user(&info, (void __user *)arg, minsz)) 663 return -EFAULT; 664 665 if (info.argsz < minsz) 666 return -EINVAL; 667 668 switch (info.index) { 669 case VFIO_PCI_CONFIG_REGION_INDEX: 670 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 671 info.size = pdev->cfg_size; 672 info.flags = VFIO_REGION_INFO_FLAG_READ | 673 VFIO_REGION_INFO_FLAG_WRITE; 674 break; 675 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: 676 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 677 info.size = pci_resource_len(pdev, info.index); 678 if (!info.size) { 679 info.flags = 0; 680 break; 681 } 682 683 info.flags = VFIO_REGION_INFO_FLAG_READ | 684 VFIO_REGION_INFO_FLAG_WRITE; 685 if (vdev->bar_mmap_supported[info.index]) { 686 info.flags |= VFIO_REGION_INFO_FLAG_MMAP; 687 if (info.index == vdev->msix_bar) { 688 ret = msix_sparse_mmap_cap(vdev, &caps); 689 if (ret) 690 return ret; 691 } 692 } 693 694 break; 695 case VFIO_PCI_ROM_REGION_INDEX: 696 { 697 void __iomem *io; 698 size_t size; 699 700 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 701 info.flags = 0; 702 703 /* Report the BAR size, not the ROM size */ 704 info.size = pci_resource_len(pdev, info.index); 705 if (!info.size) { 706 /* Shadow ROMs appear as PCI option ROMs */ 707 if (pdev->resource[PCI_ROM_RESOURCE].flags & 708 IORESOURCE_ROM_SHADOW) 709 info.size = 0x20000; 710 else 711 break; 712 } 713 714 /* Is it really there? */ 715 io = pci_map_rom(pdev, &size); 716 if (!io || !size) { 717 info.size = 0; 718 break; 719 } 720 pci_unmap_rom(pdev, io); 721 722 info.flags = VFIO_REGION_INFO_FLAG_READ; 723 break; 724 } 725 case VFIO_PCI_VGA_REGION_INDEX: 726 if (!vdev->has_vga) 727 return -EINVAL; 728 729 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 730 info.size = 0xc0000; 731 info.flags = VFIO_REGION_INFO_FLAG_READ | 732 VFIO_REGION_INFO_FLAG_WRITE; 733 734 break; 735 default: 736 { 737 struct vfio_region_info_cap_type cap_type; 738 739 if (info.index >= 740 VFIO_PCI_NUM_REGIONS + vdev->num_regions) 741 return -EINVAL; 742 743 i = info.index - VFIO_PCI_NUM_REGIONS; 744 745 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); 746 info.size = vdev->region[i].size; 747 info.flags = vdev->region[i].flags; 748 749 cap_type.type = vdev->region[i].type; 750 cap_type.subtype = vdev->region[i].subtype; 751 752 ret = vfio_info_add_capability(&caps, 753 VFIO_REGION_INFO_CAP_TYPE, 754 &cap_type); 755 if (ret) 756 return ret; 757 758 } 759 } 760 761 if (caps.size) { 762 info.flags |= VFIO_REGION_INFO_FLAG_CAPS; 763 if (info.argsz < sizeof(info) + caps.size) { 764 info.argsz = sizeof(info) + caps.size; 765 info.cap_offset = 0; 766 } else { 767 vfio_info_cap_shift(&caps, sizeof(info)); 768 if (copy_to_user((void __user *)arg + 769 sizeof(info), caps.buf, 770 caps.size)) { 771 kfree(caps.buf); 772 return -EFAULT; 773 } 774 info.cap_offset = sizeof(info); 775 } 776 777 kfree(caps.buf); 778 } 779 780 return copy_to_user((void __user *)arg, &info, minsz) ? 781 -EFAULT : 0; 782 783 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { 784 struct vfio_irq_info info; 785 786 minsz = offsetofend(struct vfio_irq_info, count); 787 788 if (copy_from_user(&info, (void __user *)arg, minsz)) 789 return -EFAULT; 790 791 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS) 792 return -EINVAL; 793 794 switch (info.index) { 795 case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX: 796 case VFIO_PCI_REQ_IRQ_INDEX: 797 break; 798 case VFIO_PCI_ERR_IRQ_INDEX: 799 if (pci_is_pcie(vdev->pdev)) 800 break; 801 /* pass thru to return error */ 802 default: 803 return -EINVAL; 804 } 805 806 info.flags = VFIO_IRQ_INFO_EVENTFD; 807 808 info.count = vfio_pci_get_irq_count(vdev, info.index); 809 810 if (info.index == VFIO_PCI_INTX_IRQ_INDEX) 811 info.flags |= (VFIO_IRQ_INFO_MASKABLE | 812 VFIO_IRQ_INFO_AUTOMASKED); 813 else 814 info.flags |= VFIO_IRQ_INFO_NORESIZE; 815 816 return copy_to_user((void __user *)arg, &info, minsz) ? 817 -EFAULT : 0; 818 819 } else if (cmd == VFIO_DEVICE_SET_IRQS) { 820 struct vfio_irq_set hdr; 821 u8 *data = NULL; 822 int max, ret = 0; 823 size_t data_size = 0; 824 825 minsz = offsetofend(struct vfio_irq_set, count); 826 827 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 828 return -EFAULT; 829 830 max = vfio_pci_get_irq_count(vdev, hdr.index); 831 832 ret = vfio_set_irqs_validate_and_prepare(&hdr, max, 833 VFIO_PCI_NUM_IRQS, &data_size); 834 if (ret) 835 return ret; 836 837 if (data_size) { 838 data = memdup_user((void __user *)(arg + minsz), 839 data_size); 840 if (IS_ERR(data)) 841 return PTR_ERR(data); 842 } 843 844 mutex_lock(&vdev->igate); 845 846 ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index, 847 hdr.start, hdr.count, data); 848 849 mutex_unlock(&vdev->igate); 850 kfree(data); 851 852 return ret; 853 854 } else if (cmd == VFIO_DEVICE_RESET) { 855 return vdev->reset_works ? 856 pci_try_reset_function(vdev->pdev) : -EINVAL; 857 858 } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) { 859 struct vfio_pci_hot_reset_info hdr; 860 struct vfio_pci_fill_info fill = { 0 }; 861 struct vfio_pci_dependent_device *devices = NULL; 862 bool slot = false; 863 int ret = 0; 864 865 minsz = offsetofend(struct vfio_pci_hot_reset_info, count); 866 867 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 868 return -EFAULT; 869 870 if (hdr.argsz < minsz) 871 return -EINVAL; 872 873 hdr.flags = 0; 874 875 /* Can we do a slot or bus reset or neither? */ 876 if (!pci_probe_reset_slot(vdev->pdev->slot)) 877 slot = true; 878 else if (pci_probe_reset_bus(vdev->pdev->bus)) 879 return -ENODEV; 880 881 /* How many devices are affected? */ 882 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 883 vfio_pci_count_devs, 884 &fill.max, slot); 885 if (ret) 886 return ret; 887 888 WARN_ON(!fill.max); /* Should always be at least one */ 889 890 /* 891 * If there's enough space, fill it now, otherwise return 892 * -ENOSPC and the number of devices affected. 893 */ 894 if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) { 895 ret = -ENOSPC; 896 hdr.count = fill.max; 897 goto reset_info_exit; 898 } 899 900 devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL); 901 if (!devices) 902 return -ENOMEM; 903 904 fill.devices = devices; 905 906 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 907 vfio_pci_fill_devs, 908 &fill, slot); 909 910 /* 911 * If a device was removed between counting and filling, 912 * we may come up short of fill.max. If a device was 913 * added, we'll have a return of -EAGAIN above. 914 */ 915 if (!ret) 916 hdr.count = fill.cur; 917 918 reset_info_exit: 919 if (copy_to_user((void __user *)arg, &hdr, minsz)) 920 ret = -EFAULT; 921 922 if (!ret) { 923 if (copy_to_user((void __user *)(arg + minsz), devices, 924 hdr.count * sizeof(*devices))) 925 ret = -EFAULT; 926 } 927 928 kfree(devices); 929 return ret; 930 931 } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) { 932 struct vfio_pci_hot_reset hdr; 933 int32_t *group_fds; 934 struct vfio_pci_group_entry *groups; 935 struct vfio_pci_group_info info; 936 bool slot = false; 937 int i, count = 0, ret = 0; 938 939 minsz = offsetofend(struct vfio_pci_hot_reset, count); 940 941 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 942 return -EFAULT; 943 944 if (hdr.argsz < minsz || hdr.flags) 945 return -EINVAL; 946 947 /* Can we do a slot or bus reset or neither? */ 948 if (!pci_probe_reset_slot(vdev->pdev->slot)) 949 slot = true; 950 else if (pci_probe_reset_bus(vdev->pdev->bus)) 951 return -ENODEV; 952 953 /* 954 * We can't let userspace give us an arbitrarily large 955 * buffer to copy, so verify how many we think there 956 * could be. Note groups can have multiple devices so 957 * one group per device is the max. 958 */ 959 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 960 vfio_pci_count_devs, 961 &count, slot); 962 if (ret) 963 return ret; 964 965 /* Somewhere between 1 and count is OK */ 966 if (!hdr.count || hdr.count > count) 967 return -EINVAL; 968 969 group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL); 970 groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL); 971 if (!group_fds || !groups) { 972 kfree(group_fds); 973 kfree(groups); 974 return -ENOMEM; 975 } 976 977 if (copy_from_user(group_fds, (void __user *)(arg + minsz), 978 hdr.count * sizeof(*group_fds))) { 979 kfree(group_fds); 980 kfree(groups); 981 return -EFAULT; 982 } 983 984 /* 985 * For each group_fd, get the group through the vfio external 986 * user interface and store the group and iommu ID. This 987 * ensures the group is held across the reset. 988 */ 989 for (i = 0; i < hdr.count; i++) { 990 struct vfio_group *group; 991 struct fd f = fdget(group_fds[i]); 992 if (!f.file) { 993 ret = -EBADF; 994 break; 995 } 996 997 group = vfio_group_get_external_user(f.file); 998 fdput(f); 999 if (IS_ERR(group)) { 1000 ret = PTR_ERR(group); 1001 break; 1002 } 1003 1004 groups[i].group = group; 1005 groups[i].id = vfio_external_user_iommu_id(group); 1006 } 1007 1008 kfree(group_fds); 1009 1010 /* release reference to groups on error */ 1011 if (ret) 1012 goto hot_reset_release; 1013 1014 info.count = hdr.count; 1015 info.groups = groups; 1016 1017 /* 1018 * Test whether all the affected devices are contained 1019 * by the set of groups provided by the user. 1020 */ 1021 ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, 1022 vfio_pci_validate_devs, 1023 &info, slot); 1024 if (!ret) 1025 /* User has access, do the reset */ 1026 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : 1027 pci_try_reset_bus(vdev->pdev->bus); 1028 1029 hot_reset_release: 1030 for (i--; i >= 0; i--) 1031 vfio_group_put_external_user(groups[i].group); 1032 1033 kfree(groups); 1034 return ret; 1035 } 1036 1037 return -ENOTTY; 1038 } 1039 1040 static ssize_t vfio_pci_rw(void *device_data, char __user *buf, 1041 size_t count, loff_t *ppos, bool iswrite) 1042 { 1043 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos); 1044 struct vfio_pci_device *vdev = device_data; 1045 1046 if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions) 1047 return -EINVAL; 1048 1049 switch (index) { 1050 case VFIO_PCI_CONFIG_REGION_INDEX: 1051 return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite); 1052 1053 case VFIO_PCI_ROM_REGION_INDEX: 1054 if (iswrite) 1055 return -EINVAL; 1056 return vfio_pci_bar_rw(vdev, buf, count, ppos, false); 1057 1058 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: 1059 return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite); 1060 1061 case VFIO_PCI_VGA_REGION_INDEX: 1062 return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite); 1063 default: 1064 index -= VFIO_PCI_NUM_REGIONS; 1065 return vdev->region[index].ops->rw(vdev, buf, 1066 count, ppos, iswrite); 1067 } 1068 1069 return -EINVAL; 1070 } 1071 1072 static ssize_t vfio_pci_read(void *device_data, char __user *buf, 1073 size_t count, loff_t *ppos) 1074 { 1075 if (!count) 1076 return 0; 1077 1078 return vfio_pci_rw(device_data, buf, count, ppos, false); 1079 } 1080 1081 static ssize_t vfio_pci_write(void *device_data, const char __user *buf, 1082 size_t count, loff_t *ppos) 1083 { 1084 if (!count) 1085 return 0; 1086 1087 return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true); 1088 } 1089 1090 static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma) 1091 { 1092 struct vfio_pci_device *vdev = device_data; 1093 struct pci_dev *pdev = vdev->pdev; 1094 unsigned int index; 1095 u64 phys_len, req_len, pgoff, req_start; 1096 int ret; 1097 1098 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); 1099 1100 if (vma->vm_end < vma->vm_start) 1101 return -EINVAL; 1102 if ((vma->vm_flags & VM_SHARED) == 0) 1103 return -EINVAL; 1104 if (index >= VFIO_PCI_ROM_REGION_INDEX) 1105 return -EINVAL; 1106 if (!vdev->bar_mmap_supported[index]) 1107 return -EINVAL; 1108 1109 phys_len = PAGE_ALIGN(pci_resource_len(pdev, index)); 1110 req_len = vma->vm_end - vma->vm_start; 1111 pgoff = vma->vm_pgoff & 1112 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1); 1113 req_start = pgoff << PAGE_SHIFT; 1114 1115 if (req_start + req_len > phys_len) 1116 return -EINVAL; 1117 1118 if (index == vdev->msix_bar) { 1119 /* 1120 * Disallow mmaps overlapping the MSI-X table; users don't 1121 * get to touch this directly. We could find somewhere 1122 * else to map the overlap, but page granularity is only 1123 * a recommendation, not a requirement, so the user needs 1124 * to know which bits are real. Requiring them to mmap 1125 * around the table makes that clear. 1126 */ 1127 1128 /* If neither entirely above nor below, then it overlaps */ 1129 if (!(req_start >= vdev->msix_offset + vdev->msix_size || 1130 req_start + req_len <= vdev->msix_offset)) 1131 return -EINVAL; 1132 } 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 group = vfio_iommu_group_get(&pdev->dev); 1200 if (!group) 1201 return -EINVAL; 1202 1203 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); 1204 if (!vdev) { 1205 vfio_iommu_group_put(group, &pdev->dev); 1206 return -ENOMEM; 1207 } 1208 1209 vdev->pdev = pdev; 1210 vdev->irq_type = VFIO_PCI_NUM_IRQS; 1211 mutex_init(&vdev->igate); 1212 spin_lock_init(&vdev->irqlock); 1213 1214 ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev); 1215 if (ret) { 1216 vfio_iommu_group_put(group, &pdev->dev); 1217 kfree(vdev); 1218 return ret; 1219 } 1220 1221 if (vfio_pci_is_vga(pdev)) { 1222 vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode); 1223 vga_set_legacy_decoding(pdev, 1224 vfio_pci_set_vga_decode(vdev, false)); 1225 } 1226 1227 if (!disable_idle_d3) { 1228 /* 1229 * pci-core sets the device power state to an unknown value at 1230 * bootup and after being removed from a driver. The only 1231 * transition it allows from this unknown state is to D0, which 1232 * typically happens when a driver calls pci_enable_device(). 1233 * We're not ready to enable the device yet, but we do want to 1234 * be able to get to D3. Therefore first do a D0 transition 1235 * before going to D3. 1236 */ 1237 pci_set_power_state(pdev, PCI_D0); 1238 pci_set_power_state(pdev, PCI_D3hot); 1239 } 1240 1241 return ret; 1242 } 1243 1244 static void vfio_pci_remove(struct pci_dev *pdev) 1245 { 1246 struct vfio_pci_device *vdev; 1247 1248 vdev = vfio_del_group_dev(&pdev->dev); 1249 if (!vdev) 1250 return; 1251 1252 vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev); 1253 kfree(vdev->region); 1254 kfree(vdev); 1255 1256 if (vfio_pci_is_vga(pdev)) { 1257 vga_client_register(pdev, NULL, NULL, NULL); 1258 vga_set_legacy_decoding(pdev, 1259 VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM | 1260 VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM); 1261 } 1262 1263 if (!disable_idle_d3) 1264 pci_set_power_state(pdev, PCI_D0); 1265 } 1266 1267 static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev, 1268 pci_channel_state_t state) 1269 { 1270 struct vfio_pci_device *vdev; 1271 struct vfio_device *device; 1272 1273 device = vfio_device_get_from_dev(&pdev->dev); 1274 if (device == NULL) 1275 return PCI_ERS_RESULT_DISCONNECT; 1276 1277 vdev = vfio_device_data(device); 1278 if (vdev == NULL) { 1279 vfio_device_put(device); 1280 return PCI_ERS_RESULT_DISCONNECT; 1281 } 1282 1283 mutex_lock(&vdev->igate); 1284 1285 if (vdev->err_trigger) 1286 eventfd_signal(vdev->err_trigger, 1); 1287 1288 mutex_unlock(&vdev->igate); 1289 1290 vfio_device_put(device); 1291 1292 return PCI_ERS_RESULT_CAN_RECOVER; 1293 } 1294 1295 static const struct pci_error_handlers vfio_err_handlers = { 1296 .error_detected = vfio_pci_aer_err_detected, 1297 }; 1298 1299 static struct pci_driver vfio_pci_driver = { 1300 .name = "vfio-pci", 1301 .id_table = NULL, /* only dynamic ids */ 1302 .probe = vfio_pci_probe, 1303 .remove = vfio_pci_remove, 1304 .err_handler = &vfio_err_handlers, 1305 }; 1306 1307 struct vfio_devices { 1308 struct vfio_device **devices; 1309 int cur_index; 1310 int max_index; 1311 }; 1312 1313 static int vfio_pci_get_devs(struct pci_dev *pdev, void *data) 1314 { 1315 struct vfio_devices *devs = data; 1316 struct vfio_device *device; 1317 1318 if (devs->cur_index == devs->max_index) 1319 return -ENOSPC; 1320 1321 device = vfio_device_get_from_dev(&pdev->dev); 1322 if (!device) 1323 return -EINVAL; 1324 1325 if (pci_dev_driver(pdev) != &vfio_pci_driver) { 1326 vfio_device_put(device); 1327 return -EBUSY; 1328 } 1329 1330 devs->devices[devs->cur_index++] = device; 1331 return 0; 1332 } 1333 1334 /* 1335 * Attempt to do a bus/slot reset if there are devices affected by a reset for 1336 * this device that are needs_reset and all of the affected devices are unused 1337 * (!refcnt). Callers are required to hold driver_lock when calling this to 1338 * prevent device opens and concurrent bus reset attempts. We prevent device 1339 * unbinds by acquiring and holding a reference to the vfio_device. 1340 * 1341 * NB: vfio-core considers a group to be viable even if some devices are 1342 * bound to drivers like pci-stub or pcieport. Here we require all devices 1343 * to be bound to vfio_pci since that's the only way we can be sure they 1344 * stay put. 1345 */ 1346 static void vfio_pci_try_bus_reset(struct vfio_pci_device *vdev) 1347 { 1348 struct vfio_devices devs = { .cur_index = 0 }; 1349 int i = 0, ret = -EINVAL; 1350 bool needs_reset = false, slot = false; 1351 struct vfio_pci_device *tmp; 1352 1353 if (!pci_probe_reset_slot(vdev->pdev->slot)) 1354 slot = true; 1355 else if (pci_probe_reset_bus(vdev->pdev->bus)) 1356 return; 1357 1358 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs, 1359 &i, slot) || !i) 1360 return; 1361 1362 devs.max_index = i; 1363 devs.devices = kcalloc(i, sizeof(struct vfio_device *), GFP_KERNEL); 1364 if (!devs.devices) 1365 return; 1366 1367 if (vfio_pci_for_each_slot_or_bus(vdev->pdev, 1368 vfio_pci_get_devs, &devs, slot)) 1369 goto put_devs; 1370 1371 for (i = 0; i < devs.cur_index; i++) { 1372 tmp = vfio_device_data(devs.devices[i]); 1373 if (tmp->needs_reset) 1374 needs_reset = true; 1375 if (tmp->refcnt) 1376 goto put_devs; 1377 } 1378 1379 if (needs_reset) 1380 ret = slot ? pci_try_reset_slot(vdev->pdev->slot) : 1381 pci_try_reset_bus(vdev->pdev->bus); 1382 1383 put_devs: 1384 for (i = 0; i < devs.cur_index; i++) { 1385 tmp = vfio_device_data(devs.devices[i]); 1386 if (!ret) 1387 tmp->needs_reset = false; 1388 1389 if (!tmp->refcnt && !disable_idle_d3) 1390 pci_set_power_state(tmp->pdev, PCI_D3hot); 1391 1392 vfio_device_put(devs.devices[i]); 1393 } 1394 1395 kfree(devs.devices); 1396 } 1397 1398 static void __exit vfio_pci_cleanup(void) 1399 { 1400 pci_unregister_driver(&vfio_pci_driver); 1401 vfio_pci_uninit_perm_bits(); 1402 } 1403 1404 static void __init vfio_pci_fill_ids(void) 1405 { 1406 char *p, *id; 1407 int rc; 1408 1409 /* no ids passed actually */ 1410 if (ids[0] == '\0') 1411 return; 1412 1413 /* add ids specified in the module parameter */ 1414 p = ids; 1415 while ((id = strsep(&p, ","))) { 1416 unsigned int vendor, device, subvendor = PCI_ANY_ID, 1417 subdevice = PCI_ANY_ID, class = 0, class_mask = 0; 1418 int fields; 1419 1420 if (!strlen(id)) 1421 continue; 1422 1423 fields = sscanf(id, "%x:%x:%x:%x:%x:%x", 1424 &vendor, &device, &subvendor, &subdevice, 1425 &class, &class_mask); 1426 1427 if (fields < 2) { 1428 pr_warn("invalid id string \"%s\"\n", id); 1429 continue; 1430 } 1431 1432 rc = pci_add_dynid(&vfio_pci_driver, vendor, device, 1433 subvendor, subdevice, class, class_mask, 0); 1434 if (rc) 1435 pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n", 1436 vendor, device, subvendor, subdevice, 1437 class, class_mask, rc); 1438 else 1439 pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n", 1440 vendor, device, subvendor, subdevice, 1441 class, class_mask); 1442 } 1443 } 1444 1445 static int __init vfio_pci_init(void) 1446 { 1447 int ret; 1448 1449 /* Allocate shared config space permision data used by all devices */ 1450 ret = vfio_pci_init_perm_bits(); 1451 if (ret) 1452 return ret; 1453 1454 /* Register and scan for devices */ 1455 ret = pci_register_driver(&vfio_pci_driver); 1456 if (ret) 1457 goto out_driver; 1458 1459 vfio_pci_fill_ids(); 1460 1461 return 0; 1462 1463 out_driver: 1464 vfio_pci_uninit_perm_bits(); 1465 return ret; 1466 } 1467 1468 module_init(vfio_pci_init); 1469 module_exit(vfio_pci_cleanup); 1470 1471 MODULE_VERSION(DRIVER_VERSION); 1472 MODULE_LICENSE("GPL v2"); 1473 MODULE_AUTHOR(DRIVER_AUTHOR); 1474 MODULE_DESCRIPTION(DRIVER_DESC); 1475