drivers/vfio/vfio_iommu_spapr_tce.c

   1 /*
   2  * VFIO: IOMMU DMA mapping support for TCE on POWER
   3  *
   4  * Copyright (C) 2013 IBM Corp.  All rights reserved.
   5  *     Author: Alexey Kardashevskiy <[email protected]>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * Derived from original vfio_iommu_type1.c:
  12  * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
  13  *     Author: Alex Williamson <[email protected]>
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/pci.h>
  18 #include <linux/slab.h>
  19 #include <linux/uaccess.h>
  20 #include <linux/err.h>
  21 #include <linux/vfio.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/sched/mm.h>
  24 #include <linux/sched/signal.h>
  25
  26 #include <asm/iommu.h>
  27 #include <asm/tce.h>
  28 #include <asm/mmu_context.h>
  29
  30 #define DRIVER_VERSION  "0.1"
  31 #define DRIVER_AUTHOR   "[email protected]"
  32 #define DRIVER_DESC     "VFIO IOMMU SPAPR TCE"
  33
  34 static void tce_iommu_detach_group(void *iommu_data,
  35                 struct iommu_group *iommu_group);
  36
  37 static long try_increment_locked_vm(struct mm_struct *mm, long npages)
  38 {
  39         long ret = 0, locked, lock_limit;
  40
  41         if (WARN_ON_ONCE(!mm))
  42                 return -EPERM;
  43
  44         if (!npages)
  45                 return 0;
  46
  47         down_write(&mm->mmap_sem);
  48         locked = mm->locked_vm + npages;
  49         lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
  50         if (locked > lock_limit && !capable(CAP_IPC_LOCK))
  51                 ret = -ENOMEM;
  52         else
  53                 mm->locked_vm += npages;
  54
  55         pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current->pid,
  56                         npages << PAGE_SHIFT,
  57                         mm->locked_vm << PAGE_SHIFT,
  58                         rlimit(RLIMIT_MEMLOCK),
  59                         ret ? " - exceeded" : "");
  60
  61         up_write(&mm->mmap_sem);
  62
  63         return ret;
  64 }
  65
  66 static void decrement_locked_vm(struct mm_struct *mm, long npages)
  67 {
  68         if (!mm || !npages)
  69                 return;
  70
  71         down_write(&mm->mmap_sem);
  72         if (WARN_ON_ONCE(npages > mm->locked_vm))
  73                 npages = mm->locked_vm;
  74         mm->locked_vm -= npages;
  75         pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current->pid,
  76                         npages << PAGE_SHIFT,
  77                         mm->locked_vm << PAGE_SHIFT,
  78                         rlimit(RLIMIT_MEMLOCK));
  79         up_write(&mm->mmap_sem);
  80 }
  81
  82 /*
  83  * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation
  84  *
  85  * This code handles mapping and unmapping of user data buffers
  86  * into DMA'ble space using the IOMMU
  87  */
  88
  89 struct tce_iommu_group {
  90         struct list_head next;
  91         struct iommu_group *grp;
  92 };
  93
  94 /*
  95  * A container needs to remember which preregistered region  it has
  96  * referenced to do proper cleanup at the userspace process exit.
  97  */
  98 struct tce_iommu_prereg {
  99         struct list_head next;
 100         struct mm_iommu_table_group_mem_t *mem;
 101 };
 102
 103 /*
 104  * The container descriptor supports only a single group per container.
 105  * Required by the API as the container is not supplied with the IOMMU group
 106  * at the moment of initialization.
 107  */
 108 struct tce_container {
 109         struct mutex lock;
 110         bool enabled;
 111         bool v2;
 112         bool def_window_pending;
 113         unsigned long locked_pages;
 114         struct mm_struct *mm;
 115         struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES];
 116         struct list_head group_list;
 117         struct list_head prereg_list;
 118 };
 119
 120 static long tce_iommu_mm_set(struct tce_container *container)
 121 {
 122         if (container->mm) {
 123                 if (container->mm == current->mm)
 124                         return 0;
 125                 return -EPERM;
 126         }
 127         BUG_ON(!current->mm);
 128         container->mm = current->mm;
 129         atomic_inc(&container->mm->mm_count);
 130
 131         return 0;
 132 }
 133
 134 static long tce_iommu_prereg_free(struct tce_container *container,
 135                 struct tce_iommu_prereg *tcemem)
 136 {
 137         long ret;
 138
 139         ret = mm_iommu_put(container->mm, tcemem->mem);
 140         if (ret)
 141                 return ret;
 142
 143         list_del(&tcemem->next);
 144         kfree(tcemem);
 145
 146         return 0;
 147 }
 148
 149 static long tce_iommu_unregister_pages(struct tce_container *container,
 150                 __u64 vaddr, __u64 size)
 151 {
 152         struct mm_iommu_table_group_mem_t *mem;
 153         struct tce_iommu_prereg *tcemem;
 154         bool found = false;
 155         long ret;
 156
 157         if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK))
 158                 return -EINVAL;
 159
 160         mem = mm_iommu_get(container->mm, vaddr, size >> PAGE_SHIFT);
 161         if (!mem)
 162                 return -ENOENT;
 163
 164         list_for_each_entry(tcemem, &container->prereg_list, next) {
 165                 if (tcemem->mem == mem) {
 166                         found = true;
 167                         break;
 168                 }
 169         }
 170
 171         if (!found)
 172                 ret = -ENOENT;
 173         else
 174                 ret = tce_iommu_prereg_free(container, tcemem);
 175
 176         mm_iommu_put(container->mm, mem);
 177
 178         return ret;
 179 }
 180
 181 static long tce_iommu_register_pages(struct tce_container *container,
 182                 __u64 vaddr, __u64 size)
 183 {
 184         long ret = 0;
 185         struct mm_iommu_table_group_mem_t *mem = NULL;
 186         struct tce_iommu_prereg *tcemem;
 187         unsigned long entries = size >> PAGE_SHIFT;
 188
 189         if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK) ||
 190                         ((vaddr + size) < vaddr))
 191                 return -EINVAL;
 192
 193         mem = mm_iommu_get(container->mm, vaddr, entries);
 194         if (mem) {
 195                 list_for_each_entry(tcemem, &container->prereg_list, next) {
 196                         if (tcemem->mem == mem) {
 197                                 ret = -EBUSY;
 198                                 goto put_exit;
 199                         }
 200                 }
 201         } else {
 202                 ret = mm_iommu_new(container->mm, vaddr, entries, &mem);
 203                 if (ret)
 204                         return ret;
 205         }
 206
 207         tcemem = kzalloc(sizeof(*tcemem), GFP_KERNEL);
 208         if (!tcemem) {
 209                 ret = -ENOMEM;
 210                 goto put_exit;
 211         }
 212
 213         tcemem->mem = mem;
 214         list_add(&tcemem->next, &container->prereg_list);
 215
 216         container->enabled = true;
 217
 218         return 0;
 219
 220 put_exit:
 221         mm_iommu_put(container->mm, mem);
 222         return ret;
 223 }
 224
 225 static bool tce_page_is_contained(struct mm_struct *mm, unsigned long hpa,
 226                 unsigned int page_shift)
 227 {
 228         struct page *page;
 229         unsigned long size = 0;
 230
 231         if (mm_iommu_is_devmem(mm, hpa, page_shift, &size))
 232                 return size == (1UL << page_shift);
 233
 234         page = pfn_to_page(hpa >> PAGE_SHIFT);
 235         /*
 236          * Check that the TCE table granularity is not bigger than the size of
 237          * a page we just found. Otherwise the hardware can get access to
 238          * a bigger memory chunk that it should.
 239          */
 240         return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift;
 241 }
 242
 243 static inline bool tce_groups_attached(struct tce_container *container)
 244 {
 245         return !list_empty(&container->group_list);
 246 }
 247
 248 static long tce_iommu_find_table(struct tce_container *container,
 249                 phys_addr_t ioba, struct iommu_table **ptbl)
 250 {
 251         long i;
 252
 253         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
 254                 struct iommu_table *tbl = container->tables[i];
 255
 256                 if (tbl) {
 257                         unsigned long entry = ioba >> tbl->it_page_shift;
 258                         unsigned long start = tbl->it_offset;
 259                         unsigned long end = start + tbl->it_size;
 260
 261                         if ((start <= entry) && (entry < end)) {
 262                                 *ptbl = tbl;
 263                                 return i;
 264                         }
 265                 }
 266         }
 267
 268         return -1;
 269 }
 270
 271 static int tce_iommu_find_free_table(struct tce_container *container)
 272 {
 273         int i;
 274
 275         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
 276                 if (!container->tables[i])
 277                         return i;
 278         }
 279
 280         return -ENOSPC;
 281 }
 282
 283 static int tce_iommu_enable(struct tce_container *container)
 284 {
 285         int ret = 0;
 286         unsigned long locked;
 287         struct iommu_table_group *table_group;
 288         struct tce_iommu_group *tcegrp;
 289
 290         if (container->enabled)
 291                 return -EBUSY;
 292
 293         /*
 294          * When userspace pages are mapped into the IOMMU, they are effectively
 295          * locked memory, so, theoretically, we need to update the accounting
 296          * of locked pages on each map and unmap.  For powerpc, the map unmap
 297          * paths can be very hot, though, and the accounting would kill
 298          * performance, especially since it would be difficult to impossible
 299          * to handle the accounting in real mode only.
 300          *
 301          * To address that, rather than precisely accounting every page, we
 302          * instead account for a worst case on locked memory when the iommu is
 303          * enabled and disabled.  The worst case upper bound on locked memory
 304          * is the size of the whole iommu window, which is usually relatively
 305          * small (compared to total memory sizes) on POWER hardware.
 306          *
 307          * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits,
 308          * that would effectively kill the guest at random points, much better
 309          * enforcing the limit based on the max that the guest can map.
 310          *
 311          * Unfortunately at the moment it counts whole tables, no matter how
 312          * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups
 313          * each with 2GB DMA window, 8GB will be counted here. The reason for
 314          * this is that we cannot tell here the amount of RAM used by the guest
 315          * as this information is only available from KVM and VFIO is
 316          * KVM agnostic.
 317          *
 318          * So we do not allow enabling a container without a group attached
 319          * as there is no way to know how much we should increment
 320          * the locked_vm counter.
 321          */
 322         if (!tce_groups_attached(container))
 323                 return -ENODEV;
 324
 325         tcegrp = list_first_entry(&container->group_list,
 326                         struct tce_iommu_group, next);
 327         table_group = iommu_group_get_iommudata(tcegrp->grp);
 328         if (!table_group)
 329                 return -ENODEV;
 330
 331         if (!table_group->tce32_size)
 332                 return -EPERM;
 333
 334         ret = tce_iommu_mm_set(container);
 335         if (ret)
 336                 return ret;
 337
 338         locked = table_group->tce32_size >> PAGE_SHIFT;
 339         ret = try_increment_locked_vm(container->mm, locked);
 340         if (ret)
 341                 return ret;
 342
 343         container->locked_pages = locked;
 344
 345         container->enabled = true;
 346
 347         return ret;
 348 }
 349
 350 static void tce_iommu_disable(struct tce_container *container)
 351 {
 352         if (!container->enabled)
 353                 return;
 354
 355         container->enabled = false;
 356
 357         BUG_ON(!container->mm);
 358         decrement_locked_vm(container->mm, container->locked_pages);
 359 }
 360
 361 static void *tce_iommu_open(unsigned long arg)
 362 {
 363         struct tce_container *container;
 364
 365         if ((arg != VFIO_SPAPR_TCE_IOMMU) && (arg != VFIO_SPAPR_TCE_v2_IOMMU)) {
 366                 pr_err("tce_vfio: Wrong IOMMU type\n");
 367                 return ERR_PTR(-EINVAL);
 368         }
 369
 370         container = kzalloc(sizeof(*container), GFP_KERNEL);
 371         if (!container)
 372                 return ERR_PTR(-ENOMEM);
 373
 374         mutex_init(&container->lock);
 375         INIT_LIST_HEAD_RCU(&container->group_list);
 376         INIT_LIST_HEAD_RCU(&container->prereg_list);
 377
 378         container->v2 = arg == VFIO_SPAPR_TCE_v2_IOMMU;
 379
 380         return container;
 381 }
 382
 383 static int tce_iommu_clear(struct tce_container *container,
 384                 struct iommu_table *tbl,
 385                 unsigned long entry, unsigned long pages);
 386 static void tce_iommu_free_table(struct tce_container *container,
 387                 struct iommu_table *tbl);
 388
 389 static void tce_iommu_release(void *iommu_data)
 390 {
 391         struct tce_container *container = iommu_data;
 392         struct tce_iommu_group *tcegrp;
 393         struct tce_iommu_prereg *tcemem, *tmtmp;
 394         long i;
 395
 396         while (tce_groups_attached(container)) {
 397                 tcegrp = list_first_entry(&container->group_list,
 398                                 struct tce_iommu_group, next);
 399                 tce_iommu_detach_group(iommu_data, tcegrp->grp);
 400         }
 401
 402         /*
 403          * If VFIO created a table, it was not disposed
 404          * by tce_iommu_detach_group() so do it now.
 405          */
 406         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
 407                 struct iommu_table *tbl = container->tables[i];
 408
 409                 if (!tbl)
 410                         continue;
 411
 412                 tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
 413                 tce_iommu_free_table(container, tbl);
 414         }
 415
 416         list_for_each_entry_safe(tcemem, tmtmp, &container->prereg_list, next)
 417                 WARN_ON(tce_iommu_prereg_free(container, tcemem));
 418
 419         tce_iommu_disable(container);
 420         if (container->mm)
 421                 mmdrop(container->mm);
 422         mutex_destroy(&container->lock);
 423
 424         kfree(container);
 425 }
 426
 427 static void tce_iommu_unuse_page(struct tce_container *container,
 428                 unsigned long hpa)
 429 {
 430         struct page *page;
 431
 432         page = pfn_to_page(hpa >> PAGE_SHIFT);
 433         put_page(page);
 434 }
 435
 436 static int tce_iommu_prereg_ua_to_hpa(struct tce_container *container,
 437                 unsigned long tce, unsigned long shift,
 438                 unsigned long *phpa, struct mm_iommu_table_group_mem_t **pmem)
 439 {
 440         long ret = 0;
 441         struct mm_iommu_table_group_mem_t *mem;
 442
 443         mem = mm_iommu_lookup(container->mm, tce, 1ULL << shift);
 444         if (!mem)
 445                 return -EINVAL;
 446
 447         ret = mm_iommu_ua_to_hpa(mem, tce, shift, phpa);
 448         if (ret)
 449                 return -EINVAL;
 450
 451         *pmem = mem;
 452
 453         return 0;
 454 }
 455
 456 static void tce_iommu_unuse_page_v2(struct tce_container *container,
 457                 struct iommu_table *tbl, unsigned long entry)
 458 {
 459         struct mm_iommu_table_group_mem_t *mem = NULL;
 460         int ret;
 461         unsigned long hpa = 0;
 462         __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry);
 463
 464         if (!pua)
 465                 return;
 466
 467         ret = tce_iommu_prereg_ua_to_hpa(container, be64_to_cpu(*pua),
 468                         tbl->it_page_shift, &hpa, &mem);
 469         if (ret)
 470                 pr_debug("%s: tce %llx at #%lx was not cached, ret=%d\n",
 471                                 __func__, be64_to_cpu(*pua), entry, ret);
 472         if (mem)
 473                 mm_iommu_mapped_dec(mem);
 474
 475         *pua = cpu_to_be64(0);
 476 }
 477
 478 static int tce_iommu_clear(struct tce_container *container,
 479                 struct iommu_table *tbl,
 480                 unsigned long entry, unsigned long pages)
 481 {
 482         unsigned long oldhpa;
 483         long ret;
 484         enum dma_data_direction direction;
 485         unsigned long lastentry = entry + pages;
 486
 487         for ( ; entry < lastentry; ++entry) {
 488                 if (tbl->it_indirect_levels && tbl->it_userspace) {
 489                         /*
 490                          * For multilevel tables, we can take a shortcut here
 491                          * and skip some TCEs as we know that the userspace
 492                          * addresses cache is a mirror of the real TCE table
 493                          * and if it is missing some indirect levels, then
 494                          * the hardware table does not have them allocated
 495                          * either and therefore does not require updating.
 496                          */
 497                         __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl,
 498                                         entry);
 499                         if (!pua) {
 500                                 /* align to level_size which is power of two */
 501                                 entry |= tbl->it_level_size - 1;
 502                                 continue;
 503                         }
 504                 }
 505
 506                 cond_resched();
 507
 508                 direction = DMA_NONE;
 509                 oldhpa = 0;
 510                 ret = iommu_tce_xchg(container->mm, tbl, entry, &oldhpa,
 511                                 &direction);
 512                 if (ret)
 513                         continue;
 514
 515                 if (direction == DMA_NONE)
 516                         continue;
 517
 518                 if (container->v2) {
 519                         tce_iommu_unuse_page_v2(container, tbl, entry);
 520                         continue;
 521                 }
 522
 523                 tce_iommu_unuse_page(container, oldhpa);
 524         }
 525
 526         return 0;
 527 }
 528
 529 static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa)
 530 {
 531         struct page *page = NULL;
 532         enum dma_data_direction direction = iommu_tce_direction(tce);
 533
 534         if (get_user_pages_fast(tce & PAGE_MASK, 1,
 535                         direction != DMA_TO_DEVICE ? FOLL_WRITE : 0,
 536                         &page) != 1)
 537                 return -EFAULT;
 538
 539         *hpa = __pa((unsigned long) page_address(page));
 540
 541         return 0;
 542 }
 543
 544 static long tce_iommu_build(struct tce_container *container,
 545                 struct iommu_table *tbl,
 546                 unsigned long entry, unsigned long tce, unsigned long pages,
 547                 enum dma_data_direction direction)
 548 {
 549         long i, ret = 0;
 550         unsigned long hpa;
 551         enum dma_data_direction dirtmp;
 552
 553         for (i = 0; i < pages; ++i) {
 554                 unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
 555
 556                 ret = tce_iommu_use_page(tce, &hpa);
 557                 if (ret)
 558                         break;
 559
 560                 if (!tce_page_is_contained(container->mm, hpa,
 561                                 tbl->it_page_shift)) {
 562                         ret = -EPERM;
 563                         break;
 564                 }
 565
 566                 hpa |= offset;
 567                 dirtmp = direction;
 568                 ret = iommu_tce_xchg(container->mm, tbl, entry + i, &hpa,
 569                                 &dirtmp);
 570                 if (ret) {
 571                         tce_iommu_unuse_page(container, hpa);
 572                         pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
 573                                         __func__, entry << tbl->it_page_shift,
 574                                         tce, ret);
 575                         break;
 576                 }
 577
 578                 if (dirtmp != DMA_NONE)
 579                         tce_iommu_unuse_page(container, hpa);
 580
 581                 tce += IOMMU_PAGE_SIZE(tbl);
 582         }
 583
 584         if (ret)
 585                 tce_iommu_clear(container, tbl, entry, i);
 586
 587         return ret;
 588 }
 589
 590 static long tce_iommu_build_v2(struct tce_container *container,
 591                 struct iommu_table *tbl,
 592                 unsigned long entry, unsigned long tce, unsigned long pages,
 593                 enum dma_data_direction direction)
 594 {
 595         long i, ret = 0;
 596         unsigned long hpa;
 597         enum dma_data_direction dirtmp;
 598
 599         for (i = 0; i < pages; ++i) {
 600                 struct mm_iommu_table_group_mem_t *mem = NULL;
 601                 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry + i);
 602
 603                 ret = tce_iommu_prereg_ua_to_hpa(container,
 604                                 tce, tbl->it_page_shift, &hpa, &mem);
 605                 if (ret)
 606                         break;
 607
 608                 if (!tce_page_is_contained(container->mm, hpa,
 609                                 tbl->it_page_shift)) {
 610                         ret = -EPERM;
 611                         break;
 612                 }
 613
 614                 /* Preserve offset within IOMMU page */
 615                 hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
 616                 dirtmp = direction;
 617
 618                 /* The registered region is being unregistered */
 619                 if (mm_iommu_mapped_inc(mem))
 620                         break;
 621
 622                 ret = iommu_tce_xchg(container->mm, tbl, entry + i, &hpa,
 623                                 &dirtmp);
 624                 if (ret) {
 625                         /* dirtmp cannot be DMA_NONE here */
 626                         tce_iommu_unuse_page_v2(container, tbl, entry + i);
 627                         pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
 628                                         __func__, entry << tbl->it_page_shift,
 629                                         tce, ret);
 630                         break;
 631                 }
 632
 633                 if (dirtmp != DMA_NONE)
 634                         tce_iommu_unuse_page_v2(container, tbl, entry + i);
 635
 636                 *pua = cpu_to_be64(tce);
 637
 638                 tce += IOMMU_PAGE_SIZE(tbl);
 639         }
 640
 641         if (ret)
 642                 tce_iommu_clear(container, tbl, entry, i);
 643
 644         return ret;
 645 }
 646
 647 static long tce_iommu_create_table(struct tce_container *container,
 648                         struct iommu_table_group *table_group,
 649                         int num,
 650                         __u32 page_shift,
 651                         __u64 window_size,
 652                         __u32 levels,
 653                         struct iommu_table **ptbl)
 654 {
 655         long ret, table_size;
 656
 657         table_size = table_group->ops->get_table_size(page_shift, window_size,
 658                         levels);
 659         if (!table_size)
 660                 return -EINVAL;
 661
 662         ret = try_increment_locked_vm(container->mm, table_size >> PAGE_SHIFT);
 663         if (ret)
 664                 return ret;
 665
 666         ret = table_group->ops->create_table(table_group, num,
 667                         page_shift, window_size, levels, ptbl);
 668
 669         WARN_ON(!ret && !(*ptbl)->it_ops->free);
 670         WARN_ON(!ret && ((*ptbl)->it_allocated_size > table_size));
 671
 672         return ret;
 673 }
 674
 675 static void tce_iommu_free_table(struct tce_container *container,
 676                 struct iommu_table *tbl)
 677 {
 678         unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT;
 679
 680         iommu_tce_table_put(tbl);
 681         decrement_locked_vm(container->mm, pages);
 682 }
 683
 684 static long tce_iommu_create_window(struct tce_container *container,
 685                 __u32 page_shift, __u64 window_size, __u32 levels,
 686                 __u64 *start_addr)
 687 {
 688         struct tce_iommu_group *tcegrp;
 689         struct iommu_table_group *table_group;
 690         struct iommu_table *tbl = NULL;
 691         long ret, num;
 692
 693         num = tce_iommu_find_free_table(container);
 694         if (num < 0)
 695                 return num;
 696
 697         /* Get the first group for ops::create_table */
 698         tcegrp = list_first_entry(&container->group_list,
 699                         struct tce_iommu_group, next);
 700         table_group = iommu_group_get_iommudata(tcegrp->grp);
 701         if (!table_group)
 702                 return -EFAULT;
 703
 704         if (!(table_group->pgsizes & (1ULL << page_shift)))
 705                 return -EINVAL;
 706
 707         if (!table_group->ops->set_window || !table_group->ops->unset_window ||
 708                         !table_group->ops->get_table_size ||
 709                         !table_group->ops->create_table)
 710                 return -EPERM;
 711
 712         /* Create TCE table */
 713         ret = tce_iommu_create_table(container, table_group, num,
 714                         page_shift, window_size, levels, &tbl);
 715         if (ret)
 716                 return ret;
 717
 718         BUG_ON(!tbl->it_ops->free);
 719
 720         /*
 721          * Program the table to every group.
 722          * Groups have been tested for compatibility at the attach time.
 723          */
 724         list_for_each_entry(tcegrp, &container->group_list, next) {
 725                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 726
 727                 ret = table_group->ops->set_window(table_group, num, tbl);
 728                 if (ret)
 729                         goto unset_exit;
 730         }
 731
 732         container->tables[num] = tbl;
 733
 734         /* Return start address assigned by platform in create_table() */
 735         *start_addr = tbl->it_offset << tbl->it_page_shift;
 736
 737         return 0;
 738
 739 unset_exit:
 740         list_for_each_entry(tcegrp, &container->group_list, next) {
 741                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 742                 table_group->ops->unset_window(table_group, num);
 743         }
 744         tce_iommu_free_table(container, tbl);
 745
 746         return ret;
 747 }
 748
 749 static long tce_iommu_remove_window(struct tce_container *container,
 750                 __u64 start_addr)
 751 {
 752         struct iommu_table_group *table_group = NULL;
 753         struct iommu_table *tbl;
 754         struct tce_iommu_group *tcegrp;
 755         int num;
 756
 757         num = tce_iommu_find_table(container, start_addr, &tbl);
 758         if (num < 0)
 759                 return -EINVAL;
 760
 761         BUG_ON(!tbl->it_size);
 762
 763         /* Detach groups from IOMMUs */
 764         list_for_each_entry(tcegrp, &container->group_list, next) {
 765                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 766
 767                 /*
 768                  * SPAPR TCE IOMMU exposes the default DMA window to
 769                  * the guest via dma32_window_start/size of
 770                  * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow
 771                  * the userspace to remove this window, some do not so
 772                  * here we check for the platform capability.
 773                  */
 774                 if (!table_group->ops || !table_group->ops->unset_window)
 775                         return -EPERM;
 776
 777                 table_group->ops->unset_window(table_group, num);
 778         }
 779
 780         /* Free table */
 781         tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
 782         tce_iommu_free_table(container, tbl);
 783         container->tables[num] = NULL;
 784
 785         return 0;
 786 }
 787
 788 static long tce_iommu_create_default_window(struct tce_container *container)
 789 {
 790         long ret;
 791         __u64 start_addr = 0;
 792         struct tce_iommu_group *tcegrp;
 793         struct iommu_table_group *table_group;
 794
 795         if (!container->def_window_pending)
 796                 return 0;
 797
 798         if (!tce_groups_attached(container))
 799                 return -ENODEV;
 800
 801         tcegrp = list_first_entry(&container->group_list,
 802                         struct tce_iommu_group, next);
 803         table_group = iommu_group_get_iommudata(tcegrp->grp);
 804         if (!table_group)
 805                 return -ENODEV;
 806
 807         ret = tce_iommu_create_window(container, IOMMU_PAGE_SHIFT_4K,
 808                         table_group->tce32_size, 1, &start_addr);
 809         WARN_ON_ONCE(!ret && start_addr);
 810
 811         if (!ret)
 812                 container->def_window_pending = false;
 813
 814         return ret;
 815 }
 816
 817 static long tce_iommu_ioctl(void *iommu_data,
 818                                  unsigned int cmd, unsigned long arg)
 819 {
 820         struct tce_container *container = iommu_data;
 821         unsigned long minsz, ddwsz;
 822         long ret;
 823
 824         switch (cmd) {
 825         case VFIO_CHECK_EXTENSION:
 826                 switch (arg) {
 827                 case VFIO_SPAPR_TCE_IOMMU:
 828                 case VFIO_SPAPR_TCE_v2_IOMMU:
 829                         ret = 1;
 830                         break;
 831                 default:
 832                         ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg);
 833                         break;
 834                 }
 835
 836                 return (ret < 0) ? 0 : ret;
 837         }
 838
 839         /*
 840          * Sanity check to prevent one userspace from manipulating
 841          * another userspace mm.
 842          */
 843         BUG_ON(!container);
 844         if (container->mm && container->mm != current->mm)
 845                 return -EPERM;
 846
 847         switch (cmd) {
 848         case VFIO_IOMMU_SPAPR_TCE_GET_INFO: {
 849                 struct vfio_iommu_spapr_tce_info info;
 850                 struct tce_iommu_group *tcegrp;
 851                 struct iommu_table_group *table_group;
 852
 853                 if (!tce_groups_attached(container))
 854                         return -ENXIO;
 855
 856                 tcegrp = list_first_entry(&container->group_list,
 857                                 struct tce_iommu_group, next);
 858                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 859
 860                 if (!table_group)
 861                         return -ENXIO;
 862
 863                 minsz = offsetofend(struct vfio_iommu_spapr_tce_info,
 864                                 dma32_window_size);
 865
 866                 if (copy_from_user(&info, (void __user *)arg, minsz))
 867                         return -EFAULT;
 868
 869                 if (info.argsz < minsz)
 870                         return -EINVAL;
 871
 872                 info.dma32_window_start = table_group->tce32_start;
 873                 info.dma32_window_size = table_group->tce32_size;
 874                 info.flags = 0;
 875                 memset(&info.ddw, 0, sizeof(info.ddw));
 876
 877                 if (table_group->max_dynamic_windows_supported &&
 878                                 container->v2) {
 879                         info.flags |= VFIO_IOMMU_SPAPR_INFO_DDW;
 880                         info.ddw.pgsizes = table_group->pgsizes;
 881                         info.ddw.max_dynamic_windows_supported =
 882                                 table_group->max_dynamic_windows_supported;
 883                         info.ddw.levels = table_group->max_levels;
 884                 }
 885
 886                 ddwsz = offsetofend(struct vfio_iommu_spapr_tce_info, ddw);
 887
 888                 if (info.argsz >= ddwsz)
 889                         minsz = ddwsz;
 890
 891                 if (copy_to_user((void __user *)arg, &info, minsz))
 892                         return -EFAULT;
 893
 894                 return 0;
 895         }
 896         case VFIO_IOMMU_MAP_DMA: {
 897                 struct vfio_iommu_type1_dma_map param;
 898                 struct iommu_table *tbl = NULL;
 899                 long num;
 900                 enum dma_data_direction direction;
 901
 902                 if (!container->enabled)
 903                         return -EPERM;
 904
 905                 minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
 906
 907                 if (copy_from_user(&param, (void __user *)arg, minsz))
 908                         return -EFAULT;
 909
 910                 if (param.argsz < minsz)
 911                         return -EINVAL;
 912
 913                 if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ |
 914                                 VFIO_DMA_MAP_FLAG_WRITE))
 915                         return -EINVAL;
 916
 917                 ret = tce_iommu_create_default_window(container);
 918                 if (ret)
 919                         return ret;
 920
 921                 num = tce_iommu_find_table(container, param.iova, &tbl);
 922                 if (num < 0)
 923                         return -ENXIO;
 924
 925                 if ((param.size & ~IOMMU_PAGE_MASK(tbl)) ||
 926                                 (param.vaddr & ~IOMMU_PAGE_MASK(tbl)))
 927                         return -EINVAL;
 928
 929                 /* iova is checked by the IOMMU API */
 930                 if (param.flags & VFIO_DMA_MAP_FLAG_READ) {
 931                         if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
 932                                 direction = DMA_BIDIRECTIONAL;
 933                         else
 934                                 direction = DMA_TO_DEVICE;
 935                 } else {
 936                         if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
 937                                 direction = DMA_FROM_DEVICE;
 938                         else
 939                                 return -EINVAL;
 940                 }
 941
 942                 ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr);
 943                 if (ret)
 944                         return ret;
 945
 946                 if (container->v2)
 947                         ret = tce_iommu_build_v2(container, tbl,
 948                                         param.iova >> tbl->it_page_shift,
 949                                         param.vaddr,
 950                                         param.size >> tbl->it_page_shift,
 951                                         direction);
 952                 else
 953                         ret = tce_iommu_build(container, tbl,
 954                                         param.iova >> tbl->it_page_shift,
 955                                         param.vaddr,
 956                                         param.size >> tbl->it_page_shift,
 957                                         direction);
 958
 959                 iommu_flush_tce(tbl);
 960
 961                 return ret;
 962         }
 963         case VFIO_IOMMU_UNMAP_DMA: {
 964                 struct vfio_iommu_type1_dma_unmap param;
 965                 struct iommu_table *tbl = NULL;
 966                 long num;
 967
 968                 if (!container->enabled)
 969                         return -EPERM;
 970
 971                 minsz = offsetofend(struct vfio_iommu_type1_dma_unmap,
 972                                 size);
 973
 974                 if (copy_from_user(&param, (void __user *)arg, minsz))
 975                         return -EFAULT;
 976
 977                 if (param.argsz < minsz)
 978                         return -EINVAL;
 979
 980                 /* No flag is supported now */
 981                 if (param.flags)
 982                         return -EINVAL;
 983
 984                 ret = tce_iommu_create_default_window(container);
 985                 if (ret)
 986                         return ret;
 987
 988                 num = tce_iommu_find_table(container, param.iova, &tbl);
 989                 if (num < 0)
 990                         return -ENXIO;
 991
 992                 if (param.size & ~IOMMU_PAGE_MASK(tbl))
 993                         return -EINVAL;
 994
 995                 ret = iommu_tce_clear_param_check(tbl, param.iova, 0,
 996                                 param.size >> tbl->it_page_shift);
 997                 if (ret)
 998                         return ret;
 999
1000                 ret = tce_iommu_clear(container, tbl,
1001                                 param.iova >> tbl->it_page_shift,
1002                                 param.size >> tbl->it_page_shift);
1003                 iommu_flush_tce(tbl);
1004
1005                 return ret;
1006         }
1007         case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: {
1008                 struct vfio_iommu_spapr_register_memory param;
1009
1010                 if (!container->v2)
1011                         break;
1012
1013                 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
1014                                 size);
1015
1016                 ret = tce_iommu_mm_set(container);
1017                 if (ret)
1018                         return ret;
1019
1020                 if (copy_from_user(&param, (void __user *)arg, minsz))
1021                         return -EFAULT;
1022
1023                 if (param.argsz < minsz)
1024                         return -EINVAL;
1025
1026                 /* No flag is supported now */
1027                 if (param.flags)
1028                         return -EINVAL;
1029
1030                 mutex_lock(&container->lock);
1031                 ret = tce_iommu_register_pages(container, param.vaddr,
1032                                 param.size);
1033                 mutex_unlock(&container->lock);
1034
1035                 return ret;
1036         }
1037         case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: {
1038                 struct vfio_iommu_spapr_register_memory param;
1039
1040                 if (!container->v2)
1041                         break;
1042
1043                 if (!container->mm)
1044                         return -EPERM;
1045
1046                 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
1047                                 size);
1048
1049                 if (copy_from_user(&param, (void __user *)arg, minsz))
1050                         return -EFAULT;
1051
1052                 if (param.argsz < minsz)
1053                         return -EINVAL;
1054
1055                 /* No flag is supported now */
1056                 if (param.flags)
1057                         return -EINVAL;
1058
1059                 mutex_lock(&container->lock);
1060                 ret = tce_iommu_unregister_pages(container, param.vaddr,
1061                                 param.size);
1062                 mutex_unlock(&container->lock);
1063
1064                 return ret;
1065         }
1066         case VFIO_IOMMU_ENABLE:
1067                 if (container->v2)
1068                         break;
1069
1070                 mutex_lock(&container->lock);
1071                 ret = tce_iommu_enable(container);
1072                 mutex_unlock(&container->lock);
1073                 return ret;
1074
1075
1076         case VFIO_IOMMU_DISABLE:
1077                 if (container->v2)
1078                         break;
1079
1080                 mutex_lock(&container->lock);
1081                 tce_iommu_disable(container);
1082                 mutex_unlock(&container->lock);
1083                 return 0;
1084
1085         case VFIO_EEH_PE_OP: {
1086                 struct tce_iommu_group *tcegrp;
1087
1088                 ret = 0;
1089                 list_for_each_entry(tcegrp, &container->group_list, next) {
1090                         ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp,
1091                                         cmd, arg);
1092                         if (ret)
1093                                 return ret;
1094                 }
1095                 return ret;
1096         }
1097
1098         case VFIO_IOMMU_SPAPR_TCE_CREATE: {
1099                 struct vfio_iommu_spapr_tce_create create;
1100
1101                 if (!container->v2)
1102                         break;
1103
1104                 ret = tce_iommu_mm_set(container);
1105                 if (ret)
1106                         return ret;
1107
1108                 if (!tce_groups_attached(container))
1109                         return -ENXIO;
1110
1111                 minsz = offsetofend(struct vfio_iommu_spapr_tce_create,
1112                                 start_addr);
1113
1114                 if (copy_from_user(&create, (void __user *)arg, minsz))
1115                         return -EFAULT;
1116
1117                 if (create.argsz < minsz)
1118                         return -EINVAL;
1119
1120                 if (create.flags)
1121                         return -EINVAL;
1122
1123                 mutex_lock(&container->lock);
1124
1125                 ret = tce_iommu_create_default_window(container);
1126                 if (!ret)
1127                         ret = tce_iommu_create_window(container,
1128                                         create.page_shift,
1129                                         create.window_size, create.levels,
1130                                         &create.start_addr);
1131
1132                 mutex_unlock(&container->lock);
1133
1134                 if (!ret && copy_to_user((void __user *)arg, &create, minsz))
1135                         ret = -EFAULT;
1136
1137                 return ret;
1138         }
1139         case VFIO_IOMMU_SPAPR_TCE_REMOVE: {
1140                 struct vfio_iommu_spapr_tce_remove remove;
1141
1142                 if (!container->v2)
1143                         break;
1144
1145                 ret = tce_iommu_mm_set(container);
1146                 if (ret)
1147                         return ret;
1148
1149                 if (!tce_groups_attached(container))
1150                         return -ENXIO;
1151
1152                 minsz = offsetofend(struct vfio_iommu_spapr_tce_remove,
1153                                 start_addr);
1154
1155                 if (copy_from_user(&remove, (void __user *)arg, minsz))
1156                         return -EFAULT;
1157
1158                 if (remove.argsz < minsz)
1159                         return -EINVAL;
1160
1161                 if (remove.flags)
1162                         return -EINVAL;
1163
1164                 if (container->def_window_pending && !remove.start_addr) {
1165                         container->def_window_pending = false;
1166                         return 0;
1167                 }
1168
1169                 mutex_lock(&container->lock);
1170
1171                 ret = tce_iommu_remove_window(container, remove.start_addr);
1172
1173                 mutex_unlock(&container->lock);
1174
1175                 return ret;
1176         }
1177         }
1178
1179         return -ENOTTY;
1180 }
1181
1182 static void tce_iommu_release_ownership(struct tce_container *container,
1183                 struct iommu_table_group *table_group)
1184 {
1185         int i;
1186
1187         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1188                 struct iommu_table *tbl = container->tables[i];
1189
1190                 if (!tbl)
1191                         continue;
1192
1193                 tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
1194                 if (tbl->it_map)
1195                         iommu_release_ownership(tbl);
1196
1197                 container->tables[i] = NULL;
1198         }
1199 }
1200
1201 static int tce_iommu_take_ownership(struct tce_container *container,
1202                 struct iommu_table_group *table_group)
1203 {
1204         int i, j, rc = 0;
1205
1206         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1207                 struct iommu_table *tbl = table_group->tables[i];
1208
1209                 if (!tbl || !tbl->it_map)
1210                         continue;
1211
1212                 rc = iommu_take_ownership(tbl);
1213                 if (rc) {
1214                         for (j = 0; j < i; ++j)
1215                                 iommu_release_ownership(
1216                                                 table_group->tables[j]);
1217
1218                         return rc;
1219                 }
1220         }
1221
1222         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1223                 container->tables[i] = table_group->tables[i];
1224
1225         return 0;
1226 }
1227
1228 static void tce_iommu_release_ownership_ddw(struct tce_container *container,
1229                 struct iommu_table_group *table_group)
1230 {
1231         long i;
1232
1233         if (!table_group->ops->unset_window) {
1234                 WARN_ON_ONCE(1);
1235                 return;
1236         }
1237
1238         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1239                 if (container->tables[i])
1240                         table_group->ops->unset_window(table_group, i);
1241
1242         table_group->ops->release_ownership(table_group);
1243 }
1244
1245 static long tce_iommu_take_ownership_ddw(struct tce_container *container,
1246                 struct iommu_table_group *table_group)
1247 {
1248         long i, ret = 0;
1249
1250         if (!table_group->ops->create_table || !table_group->ops->set_window ||
1251                         !table_group->ops->release_ownership) {
1252                 WARN_ON_ONCE(1);
1253                 return -EFAULT;
1254         }
1255
1256         table_group->ops->take_ownership(table_group);
1257
1258         /* Set all windows to the new group */
1259         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1260                 struct iommu_table *tbl = container->tables[i];
1261
1262                 if (!tbl)
1263                         continue;
1264
1265                 ret = table_group->ops->set_window(table_group, i, tbl);
1266                 if (ret)
1267                         goto release_exit;
1268         }
1269
1270         return 0;
1271
1272 release_exit:
1273         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1274                 table_group->ops->unset_window(table_group, i);
1275
1276         table_group->ops->release_ownership(table_group);
1277
1278         return ret;
1279 }
1280
1281 static int tce_iommu_attach_group(void *iommu_data,
1282                 struct iommu_group *iommu_group)
1283 {
1284         int ret;
1285         struct tce_container *container = iommu_data;
1286         struct iommu_table_group *table_group;
1287         struct tce_iommu_group *tcegrp = NULL;
1288
1289         mutex_lock(&container->lock);
1290
1291         /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
1292                         iommu_group_id(iommu_group), iommu_group); */
1293         table_group = iommu_group_get_iommudata(iommu_group);
1294         if (!table_group) {
1295                 ret = -ENODEV;
1296                 goto unlock_exit;
1297         }
1298
1299         if (tce_groups_attached(container) && (!table_group->ops ||
1300                         !table_group->ops->take_ownership ||
1301                         !table_group->ops->release_ownership)) {
1302                 ret = -EBUSY;
1303                 goto unlock_exit;
1304         }
1305
1306         /* Check if new group has the same iommu_ops (i.e. compatible) */
1307         list_for_each_entry(tcegrp, &container->group_list, next) {
1308                 struct iommu_table_group *table_group_tmp;
1309
1310                 if (tcegrp->grp == iommu_group) {
1311                         pr_warn("tce_vfio: Group %d is already attached\n",
1312                                         iommu_group_id(iommu_group));
1313                         ret = -EBUSY;
1314                         goto unlock_exit;
1315                 }
1316                 table_group_tmp = iommu_group_get_iommudata(tcegrp->grp);
1317                 if (table_group_tmp->ops->create_table !=
1318                                 table_group->ops->create_table) {
1319                         pr_warn("tce_vfio: Group %d is incompatible with group %d\n",
1320                                         iommu_group_id(iommu_group),
1321                                         iommu_group_id(tcegrp->grp));
1322                         ret = -EPERM;
1323                         goto unlock_exit;
1324                 }
1325         }
1326
1327         tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL);
1328         if (!tcegrp) {
1329                 ret = -ENOMEM;
1330                 goto unlock_exit;
1331         }
1332
1333         if (!table_group->ops || !table_group->ops->take_ownership ||
1334                         !table_group->ops->release_ownership) {
1335                 if (container->v2) {
1336                         ret = -EPERM;
1337                         goto unlock_exit;
1338                 }
1339                 ret = tce_iommu_take_ownership(container, table_group);
1340         } else {
1341                 if (!container->v2) {
1342                         ret = -EPERM;
1343                         goto unlock_exit;
1344                 }
1345                 ret = tce_iommu_take_ownership_ddw(container, table_group);
1346                 if (!tce_groups_attached(container) && !container->tables[0])
1347                         container->def_window_pending = true;
1348         }
1349
1350         if (!ret) {
1351                 tcegrp->grp = iommu_group;
1352                 list_add(&tcegrp->next, &container->group_list);
1353         }
1354
1355 unlock_exit:
1356         if (ret && tcegrp)
1357                 kfree(tcegrp);
1358
1359         mutex_unlock(&container->lock);
1360
1361         return ret;
1362 }
1363
1364 static void tce_iommu_detach_group(void *iommu_data,
1365                 struct iommu_group *iommu_group)
1366 {
1367         struct tce_container *container = iommu_data;
1368         struct iommu_table_group *table_group;
1369         bool found = false;
1370         struct tce_iommu_group *tcegrp;
1371
1372         mutex_lock(&container->lock);
1373
1374         list_for_each_entry(tcegrp, &container->group_list, next) {
1375                 if (tcegrp->grp == iommu_group) {
1376                         found = true;
1377                         break;
1378                 }
1379         }
1380
1381         if (!found) {
1382                 pr_warn("tce_vfio: detaching unattached group #%u\n",
1383                                 iommu_group_id(iommu_group));
1384                 goto unlock_exit;
1385         }
1386
1387         list_del(&tcegrp->next);
1388         kfree(tcegrp);
1389
1390         table_group = iommu_group_get_iommudata(iommu_group);
1391         BUG_ON(!table_group);
1392
1393         if (!table_group->ops || !table_group->ops->release_ownership)
1394                 tce_iommu_release_ownership(container, table_group);
1395         else
1396                 tce_iommu_release_ownership_ddw(container, table_group);
1397
1398 unlock_exit:
1399         mutex_unlock(&container->lock);
1400 }
1401
1402 static const struct vfio_iommu_driver_ops tce_iommu_driver_ops = {
1403         .name           = "iommu-vfio-powerpc",
1404         .owner          = THIS_MODULE,
1405         .open           = tce_iommu_open,
1406         .release        = tce_iommu_release,
1407         .ioctl          = tce_iommu_ioctl,
1408         .attach_group   = tce_iommu_attach_group,
1409         .detach_group   = tce_iommu_detach_group,
1410 };
1411
1412 static int __init tce_iommu_init(void)
1413 {
1414         return vfio_register_iommu_driver(&tce_iommu_driver_ops);
1415 }
1416
1417 static void __exit tce_iommu_cleanup(void)
1418 {
1419         vfio_unregister_iommu_driver(&tce_iommu_driver_ops);
1420 }
1421
1422 module_init(tce_iommu_init);
1423 module_exit(tce_iommu_cleanup);
1424
1425 MODULE_VERSION(DRIVER_VERSION);
1426 MODULE_LICENSE("GPL v2");
1427 MODULE_AUTHOR(DRIVER_AUTHOR);
1428 MODULE_DESCRIPTION(DRIVER_DESC);
1429