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 <aik@ozlabs.ru>
   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 <alex.williamson@redhat.com>
  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   "aik@ozlabs.ru"
  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, &page) != 1)
 536                 return -EFAULT;
 537
 538         *hpa = __pa((unsigned long) page_address(page));
 539
 540         return 0;
 541 }
 542
 543 static long tce_iommu_build(struct tce_container *container,
 544                 struct iommu_table *tbl,
 545                 unsigned long entry, unsigned long tce, unsigned long pages,
 546                 enum dma_data_direction direction)
 547 {
 548         long i, ret = 0;
 549         unsigned long hpa;
 550         enum dma_data_direction dirtmp;
 551
 552         for (i = 0; i < pages; ++i) {
 553                 unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
 554
 555                 ret = tce_iommu_use_page(tce, &hpa);
 556                 if (ret)
 557                         break;
 558
 559                 if (!tce_page_is_contained(container->mm, hpa,
 560                                 tbl->it_page_shift)) {
 561                         ret = -EPERM;
 562                         break;
 563                 }
 564
 565                 hpa |= offset;
 566                 dirtmp = direction;
 567                 ret = iommu_tce_xchg(container->mm, tbl, entry + i, &hpa,
 568                                 &dirtmp);
 569                 if (ret) {
 570                         tce_iommu_unuse_page(container, hpa);
 571                         pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
 572                                         __func__, entry << tbl->it_page_shift,
 573                                         tce, ret);
 574                         break;
 575                 }
 576
 577                 if (dirtmp != DMA_NONE)
 578                         tce_iommu_unuse_page(container, hpa);
 579
 580                 tce += IOMMU_PAGE_SIZE(tbl);
 581         }
 582
 583         if (ret)
 584                 tce_iommu_clear(container, tbl, entry, i);
 585
 586         return ret;
 587 }
 588
 589 static long tce_iommu_build_v2(struct tce_container *container,
 590                 struct iommu_table *tbl,
 591                 unsigned long entry, unsigned long tce, unsigned long pages,
 592                 enum dma_data_direction direction)
 593 {
 594         long i, ret = 0;
 595         unsigned long hpa;
 596         enum dma_data_direction dirtmp;
 597
 598         for (i = 0; i < pages; ++i) {
 599                 struct mm_iommu_table_group_mem_t *mem = NULL;
 600                 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry + i);
 601
 602                 ret = tce_iommu_prereg_ua_to_hpa(container,
 603                                 tce, tbl->it_page_shift, &hpa, &mem);
 604                 if (ret)
 605                         break;
 606
 607                 if (!tce_page_is_contained(container->mm, hpa,
 608                                 tbl->it_page_shift)) {
 609                         ret = -EPERM;
 610                         break;
 611                 }
 612
 613                 /* Preserve offset within IOMMU page */
 614                 hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
 615                 dirtmp = direction;
 616
 617                 /* The registered region is being unregistered */
 618                 if (mm_iommu_mapped_inc(mem))
 619                         break;
 620
 621                 ret = iommu_tce_xchg(container->mm, tbl, entry + i, &hpa,
 622                                 &dirtmp);
 623                 if (ret) {
 624                         /* dirtmp cannot be DMA_NONE here */
 625                         tce_iommu_unuse_page_v2(container, tbl, entry + i);
 626                         pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
 627                                         __func__, entry << tbl->it_page_shift,
 628                                         tce, ret);
 629                         break;
 630                 }
 631
 632                 if (dirtmp != DMA_NONE)
 633                         tce_iommu_unuse_page_v2(container, tbl, entry + i);
 634
 635                 *pua = cpu_to_be64(tce);
 636
 637                 tce += IOMMU_PAGE_SIZE(tbl);
 638         }
 639
 640         if (ret)
 641                 tce_iommu_clear(container, tbl, entry, i);
 642
 643         return ret;
 644 }
 645
 646 static long tce_iommu_create_table(struct tce_container *container,
 647                         struct iommu_table_group *table_group,
 648                         int num,
 649                         __u32 page_shift,
 650                         __u64 window_size,
 651                         __u32 levels,
 652                         struct iommu_table **ptbl)
 653 {
 654         long ret, table_size;
 655
 656         table_size = table_group->ops->get_table_size(page_shift, window_size,
 657                         levels);
 658         if (!table_size)
 659                 return -EINVAL;
 660
 661         ret = try_increment_locked_vm(container->mm, table_size >> PAGE_SHIFT);
 662         if (ret)
 663                 return ret;
 664
 665         ret = table_group->ops->create_table(table_group, num,
 666                         page_shift, window_size, levels, ptbl);
 667
 668         WARN_ON(!ret && !(*ptbl)->it_ops->free);
 669         WARN_ON(!ret && ((*ptbl)->it_allocated_size > table_size));
 670
 671         return ret;
 672 }
 673
 674 static void tce_iommu_free_table(struct tce_container *container,
 675                 struct iommu_table *tbl)
 676 {
 677         unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT;
 678
 679         iommu_tce_table_put(tbl);
 680         decrement_locked_vm(container->mm, pages);
 681 }
 682
 683 static long tce_iommu_create_window(struct tce_container *container,
 684                 __u32 page_shift, __u64 window_size, __u32 levels,
 685                 __u64 *start_addr)
 686 {
 687         struct tce_iommu_group *tcegrp;
 688         struct iommu_table_group *table_group;
 689         struct iommu_table *tbl = NULL;
 690         long ret, num;
 691
 692         num = tce_iommu_find_free_table(container);
 693         if (num < 0)
 694                 return num;
 695
 696         /* Get the first group for ops::create_table */
 697         tcegrp = list_first_entry(&container->group_list,
 698                         struct tce_iommu_group, next);
 699         table_group = iommu_group_get_iommudata(tcegrp->grp);
 700         if (!table_group)
 701                 return -EFAULT;
 702
 703         if (!(table_group->pgsizes & (1ULL << page_shift)))
 704                 return -EINVAL;
 705
 706         if (!table_group->ops->set_window || !table_group->ops->unset_window ||
 707                         !table_group->ops->get_table_size ||
 708                         !table_group->ops->create_table)
 709                 return -EPERM;
 710
 711         /* Create TCE table */
 712         ret = tce_iommu_create_table(container, table_group, num,
 713                         page_shift, window_size, levels, &tbl);
 714         if (ret)
 715                 return ret;
 716
 717         BUG_ON(!tbl->it_ops->free);
 718
 719         /*
 720          * Program the table to every group.
 721          * Groups have been tested for compatibility at the attach time.
 722          */
 723         list_for_each_entry(tcegrp, &container->group_list, next) {
 724                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 725
 726                 ret = table_group->ops->set_window(table_group, num, tbl);
 727                 if (ret)
 728                         goto unset_exit;
 729         }
 730
 731         container->tables[num] = tbl;
 732
 733         /* Return start address assigned by platform in create_table() */
 734         *start_addr = tbl->it_offset << tbl->it_page_shift;
 735
 736         return 0;
 737
 738 unset_exit:
 739         list_for_each_entry(tcegrp, &container->group_list, next) {
 740                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 741                 table_group->ops->unset_window(table_group, num);
 742         }
 743         tce_iommu_free_table(container, tbl);
 744
 745         return ret;
 746 }
 747
 748 static long tce_iommu_remove_window(struct tce_container *container,
 749                 __u64 start_addr)
 750 {
 751         struct iommu_table_group *table_group = NULL;
 752         struct iommu_table *tbl;
 753         struct tce_iommu_group *tcegrp;
 754         int num;
 755
 756         num = tce_iommu_find_table(container, start_addr, &tbl);
 757         if (num < 0)
 758                 return -EINVAL;
 759
 760         BUG_ON(!tbl->it_size);
 761
 762         /* Detach groups from IOMMUs */
 763         list_for_each_entry(tcegrp, &container->group_list, next) {
 764                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 765
 766                 /*
 767                  * SPAPR TCE IOMMU exposes the default DMA window to
 768                  * the guest via dma32_window_start/size of
 769                  * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow
 770                  * the userspace to remove this window, some do not so
 771                  * here we check for the platform capability.
 772                  */
 773                 if (!table_group->ops || !table_group->ops->unset_window)
 774                         return -EPERM;
 775
 776                 table_group->ops->unset_window(table_group, num);
 777         }
 778
 779         /* Free table */
 780         tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
 781         tce_iommu_free_table(container, tbl);
 782         container->tables[num] = NULL;
 783
 784         return 0;
 785 }
 786
 787 static long tce_iommu_create_default_window(struct tce_container *container)
 788 {
 789         long ret;
 790         __u64 start_addr = 0;
 791         struct tce_iommu_group *tcegrp;
 792         struct iommu_table_group *table_group;
 793
 794         if (!container->def_window_pending)
 795                 return 0;
 796
 797         if (!tce_groups_attached(container))
 798                 return -ENODEV;
 799
 800         tcegrp = list_first_entry(&container->group_list,
 801                         struct tce_iommu_group, next);
 802         table_group = iommu_group_get_iommudata(tcegrp->grp);
 803         if (!table_group)
 804                 return -ENODEV;
 805
 806         ret = tce_iommu_create_window(container, IOMMU_PAGE_SHIFT_4K,
 807                         table_group->tce32_size, 1, &start_addr);
 808         WARN_ON_ONCE(!ret && start_addr);
 809
 810         if (!ret)
 811                 container->def_window_pending = false;
 812
 813         return ret;
 814 }
 815
 816 static long tce_iommu_ioctl(void *iommu_data,
 817                                  unsigned int cmd, unsigned long arg)
 818 {
 819         struct tce_container *container = iommu_data;
 820         unsigned long minsz, ddwsz;
 821         long ret;
 822
 823         switch (cmd) {
 824         case VFIO_CHECK_EXTENSION:
 825                 switch (arg) {
 826                 case VFIO_SPAPR_TCE_IOMMU:
 827                 case VFIO_SPAPR_TCE_v2_IOMMU:
 828                         ret = 1;
 829                         break;
 830                 default:
 831                         ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg);
 832                         break;
 833                 }
 834
 835                 return (ret < 0) ? 0 : ret;
 836         }
 837
 838         /*
 839          * Sanity check to prevent one userspace from manipulating
 840          * another userspace mm.
 841          */
 842         BUG_ON(!container);
 843         if (container->mm && container->mm != current->mm)
 844                 return -EPERM;
 845
 846         switch (cmd) {
 847         case VFIO_IOMMU_SPAPR_TCE_GET_INFO: {
 848                 struct vfio_iommu_spapr_tce_info info;
 849                 struct tce_iommu_group *tcegrp;
 850                 struct iommu_table_group *table_group;
 851
 852                 if (!tce_groups_attached(container))
 853                         return -ENXIO;
 854
 855                 tcegrp = list_first_entry(&container->group_list,
 856                                 struct tce_iommu_group, next);
 857                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 858
 859                 if (!table_group)
 860                         return -ENXIO;
 861
 862                 minsz = offsetofend(struct vfio_iommu_spapr_tce_info,
 863                                 dma32_window_size);
 864
 865                 if (copy_from_user(&info, (void __user *)arg, minsz))
 866                         return -EFAULT;
 867
 868                 if (info.argsz < minsz)
 869                         return -EINVAL;
 870
 871                 info.dma32_window_start = table_group->tce32_start;
 872                 info.dma32_window_size = table_group->tce32_size;
 873                 info.flags = 0;
 874                 memset(&info.ddw, 0, sizeof(info.ddw));
 875
 876                 if (table_group->max_dynamic_windows_supported &&
 877                                 container->v2) {
 878                         info.flags |= VFIO_IOMMU_SPAPR_INFO_DDW;
 879                         info.ddw.pgsizes = table_group->pgsizes;
 880                         info.ddw.max_dynamic_windows_supported =
 881                                 table_group->max_dynamic_windows_supported;
 882                         info.ddw.levels = table_group->max_levels;
 883                 }
 884
 885                 ddwsz = offsetofend(struct vfio_iommu_spapr_tce_info, ddw);
 886
 887                 if (info.argsz >= ddwsz)
 888                         minsz = ddwsz;
 889
 890                 if (copy_to_user((void __user *)arg, &info, minsz))
 891                         return -EFAULT;
 892
 893                 return 0;
 894         }
 895         case VFIO_IOMMU_MAP_DMA: {
 896                 struct vfio_iommu_type1_dma_map param;
 897                 struct iommu_table *tbl = NULL;
 898                 long num;
 899                 enum dma_data_direction direction;
 900
 901                 if (!container->enabled)
 902                         return -EPERM;
 903
 904                 minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
 905
 906                 if (copy_from_user(&param, (void __user *)arg, minsz))
 907                         return -EFAULT;
 908
 909                 if (param.argsz < minsz)
 910                         return -EINVAL;
 911
 912                 if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ |
 913                                 VFIO_DMA_MAP_FLAG_WRITE))
 914                         return -EINVAL;
 915
 916                 ret = tce_iommu_create_default_window(container);
 917                 if (ret)
 918                         return ret;
 919
 920                 num = tce_iommu_find_table(container, param.iova, &tbl);
 921                 if (num < 0)
 922                         return -ENXIO;
 923
 924                 if ((param.size & ~IOMMU_PAGE_MASK(tbl)) ||
 925                                 (param.vaddr & ~IOMMU_PAGE_MASK(tbl)))
 926                         return -EINVAL;
 927
 928                 /* iova is checked by the IOMMU API */
 929                 if (param.flags & VFIO_DMA_MAP_FLAG_READ) {
 930                         if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
 931                                 direction = DMA_BIDIRECTIONAL;
 932                         else
 933                                 direction = DMA_TO_DEVICE;
 934                 } else {
 935                         if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
 936                                 direction = DMA_FROM_DEVICE;
 937                         else
 938                                 return -EINVAL;
 939                 }
 940
 941                 ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr);
 942                 if (ret)
 943                         return ret;
 944
 945                 if (container->v2)
 946                         ret = tce_iommu_build_v2(container, tbl,
 947                                         param.iova >> tbl->it_page_shift,
 948                                         param.vaddr,
 949                                         param.size >> tbl->it_page_shift,
 950                                         direction);
 951                 else
 952                         ret = tce_iommu_build(container, tbl,
 953                                         param.iova >> tbl->it_page_shift,
 954                                         param.vaddr,
 955                                         param.size >> tbl->it_page_shift,
 956                                         direction);
 957
 958                 iommu_flush_tce(tbl);
 959
 960                 return ret;
 961         }
 962         case VFIO_IOMMU_UNMAP_DMA: {
 963                 struct vfio_iommu_type1_dma_unmap param;
 964                 struct iommu_table *tbl = NULL;
 965                 long num;
 966
 967                 if (!container->enabled)
 968                         return -EPERM;
 969
 970                 minsz = offsetofend(struct vfio_iommu_type1_dma_unmap,
 971                                 size);
 972
 973                 if (copy_from_user(&param, (void __user *)arg, minsz))
 974                         return -EFAULT;
 975
 976                 if (param.argsz < minsz)
 977                         return -EINVAL;
 978
 979                 /* No flag is supported now */
 980                 if (param.flags)
 981                         return -EINVAL;
 982
 983                 ret = tce_iommu_create_default_window(container);
 984                 if (ret)
 985                         return ret;
 986
 987                 num = tce_iommu_find_table(container, param.iova, &tbl);
 988                 if (num < 0)
 989                         return -ENXIO;
 990
 991                 if (param.size & ~IOMMU_PAGE_MASK(tbl))
 992                         return -EINVAL;
 993
 994                 ret = iommu_tce_clear_param_check(tbl, param.iova, 0,
 995                                 param.size >> tbl->it_page_shift);
 996                 if (ret)
 997                         return ret;
 998
 999                 ret = tce_iommu_clear(container, tbl,
1000                                 param.iova >> tbl->it_page_shift,
1001                                 param.size >> tbl->it_page_shift);
1002                 iommu_flush_tce(tbl);
1003
1004                 return ret;
1005         }
1006         case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: {
1007                 struct vfio_iommu_spapr_register_memory param;
1008
1009                 if (!container->v2)
1010                         break;
1011
1012                 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
1013                                 size);
1014
1015                 ret = tce_iommu_mm_set(container);
1016                 if (ret)
1017                         return ret;
1018
1019                 if (copy_from_user(&param, (void __user *)arg, minsz))
1020                         return -EFAULT;
1021
1022                 if (param.argsz < minsz)
1023                         return -EINVAL;
1024
1025                 /* No flag is supported now */
1026                 if (param.flags)
1027                         return -EINVAL;
1028
1029                 mutex_lock(&container->lock);
1030                 ret = tce_iommu_register_pages(container, param.vaddr,
1031                                 param.size);
1032                 mutex_unlock(&container->lock);
1033
1034                 return ret;
1035         }
1036         case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: {
1037                 struct vfio_iommu_spapr_register_memory param;
1038
1039                 if (!container->v2)
1040                         break;
1041
1042                 if (!container->mm)
1043                         return -EPERM;
1044
1045                 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
1046                                 size);
1047
1048                 if (copy_from_user(&param, (void __user *)arg, minsz))
1049                         return -EFAULT;
1050
1051                 if (param.argsz < minsz)
1052                         return -EINVAL;
1053
1054                 /* No flag is supported now */
1055                 if (param.flags)
1056                         return -EINVAL;
1057
1058                 mutex_lock(&container->lock);
1059                 ret = tce_iommu_unregister_pages(container, param.vaddr,
1060                                 param.size);
1061                 mutex_unlock(&container->lock);
1062
1063                 return ret;
1064         }
1065         case VFIO_IOMMU_ENABLE:
1066                 if (container->v2)
1067                         break;
1068
1069                 mutex_lock(&container->lock);
1070                 ret = tce_iommu_enable(container);
1071                 mutex_unlock(&container->lock);
1072                 return ret;
1073
1074
1075         case VFIO_IOMMU_DISABLE:
1076                 if (container->v2)
1077                         break;
1078
1079                 mutex_lock(&container->lock);
1080                 tce_iommu_disable(container);
1081                 mutex_unlock(&container->lock);
1082                 return 0;
1083
1084         case VFIO_EEH_PE_OP: {
1085                 struct tce_iommu_group *tcegrp;
1086
1087                 ret = 0;
1088                 list_for_each_entry(tcegrp, &container->group_list, next) {
1089                         ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp,
1090                                         cmd, arg);
1091                         if (ret)
1092                                 return ret;
1093                 }
1094                 return ret;
1095         }
1096
1097         case VFIO_IOMMU_SPAPR_TCE_CREATE: {
1098                 struct vfio_iommu_spapr_tce_create create;
1099
1100                 if (!container->v2)
1101                         break;
1102
1103                 ret = tce_iommu_mm_set(container);
1104                 if (ret)
1105                         return ret;
1106
1107                 if (!tce_groups_attached(container))
1108                         return -ENXIO;
1109
1110                 minsz = offsetofend(struct vfio_iommu_spapr_tce_create,
1111                                 start_addr);
1112
1113                 if (copy_from_user(&create, (void __user *)arg, minsz))
1114                         return -EFAULT;
1115
1116                 if (create.argsz < minsz)
1117                         return -EINVAL;
1118
1119                 if (create.flags)
1120                         return -EINVAL;
1121
1122                 mutex_lock(&container->lock);
1123
1124                 ret = tce_iommu_create_default_window(container);
1125                 if (!ret)
1126                         ret = tce_iommu_create_window(container,
1127                                         create.page_shift,
1128                                         create.window_size, create.levels,
1129                                         &create.start_addr);
1130
1131                 mutex_unlock(&container->lock);
1132
1133                 if (!ret && copy_to_user((void __user *)arg, &create, minsz))
1134                         ret = -EFAULT;
1135
1136                 return ret;
1137         }
1138         case VFIO_IOMMU_SPAPR_TCE_REMOVE: {
1139                 struct vfio_iommu_spapr_tce_remove remove;
1140
1141                 if (!container->v2)
1142                         break;
1143
1144                 ret = tce_iommu_mm_set(container);
1145                 if (ret)
1146                         return ret;
1147
1148                 if (!tce_groups_attached(container))
1149                         return -ENXIO;
1150
1151                 minsz = offsetofend(struct vfio_iommu_spapr_tce_remove,
1152                                 start_addr);
1153
1154                 if (copy_from_user(&remove, (void __user *)arg, minsz))
1155                         return -EFAULT;
1156
1157                 if (remove.argsz < minsz)
1158                         return -EINVAL;
1159
1160                 if (remove.flags)
1161                         return -EINVAL;
1162
1163                 if (container->def_window_pending && !remove.start_addr) {
1164                         container->def_window_pending = false;
1165                         return 0;
1166                 }
1167
1168                 mutex_lock(&container->lock);
1169
1170                 ret = tce_iommu_remove_window(container, remove.start_addr);
1171
1172                 mutex_unlock(&container->lock);
1173
1174                 return ret;
1175         }
1176         }
1177
1178         return -ENOTTY;
1179 }
1180
1181 static void tce_iommu_release_ownership(struct tce_container *container,
1182                 struct iommu_table_group *table_group)
1183 {
1184         int i;
1185
1186         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1187                 struct iommu_table *tbl = container->tables[i];
1188
1189                 if (!tbl)
1190                         continue;
1191
1192                 tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
1193                 if (tbl->it_map)
1194                         iommu_release_ownership(tbl);
1195
1196                 container->tables[i] = NULL;
1197         }
1198 }
1199
1200 static int tce_iommu_take_ownership(struct tce_container *container,
1201                 struct iommu_table_group *table_group)
1202 {
1203         int i, j, rc = 0;
1204
1205         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1206                 struct iommu_table *tbl = table_group->tables[i];
1207
1208                 if (!tbl || !tbl->it_map)
1209                         continue;
1210
1211                 rc = iommu_take_ownership(tbl);
1212                 if (rc) {
1213                         for (j = 0; j < i; ++j)
1214                                 iommu_release_ownership(
1215                                                 table_group->tables[j]);
1216
1217                         return rc;
1218                 }
1219         }
1220
1221         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1222                 container->tables[i] = table_group->tables[i];
1223
1224         return 0;
1225 }
1226
1227 static void tce_iommu_release_ownership_ddw(struct tce_container *container,
1228                 struct iommu_table_group *table_group)
1229 {
1230         long i;
1231
1232         if (!table_group->ops->unset_window) {
1233                 WARN_ON_ONCE(1);
1234                 return;
1235         }
1236
1237         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1238                 if (container->tables[i])
1239                         table_group->ops->unset_window(table_group, i);
1240
1241         table_group->ops->release_ownership(table_group);
1242 }
1243
1244 static long tce_iommu_take_ownership_ddw(struct tce_container *container,
1245                 struct iommu_table_group *table_group)
1246 {
1247         long i, ret = 0;
1248
1249         if (!table_group->ops->create_table || !table_group->ops->set_window ||
1250                         !table_group->ops->release_ownership) {
1251                 WARN_ON_ONCE(1);
1252                 return -EFAULT;
1253         }
1254
1255         table_group->ops->take_ownership(table_group);
1256
1257         /* Set all windows to the new group */
1258         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1259                 struct iommu_table *tbl = container->tables[i];
1260
1261                 if (!tbl)
1262                         continue;
1263
1264                 ret = table_group->ops->set_window(table_group, i, tbl);
1265                 if (ret)
1266                         goto release_exit;
1267         }
1268
1269         return 0;
1270
1271 release_exit:
1272         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1273                 table_group->ops->unset_window(table_group, i);
1274
1275         table_group->ops->release_ownership(table_group);
1276
1277         return ret;
1278 }
1279
1280 static int tce_iommu_attach_group(void *iommu_data,
1281                 struct iommu_group *iommu_group)
1282 {
1283         int ret;
1284         struct tce_container *container = iommu_data;
1285         struct iommu_table_group *table_group;
1286         struct tce_iommu_group *tcegrp = NULL;
1287
1288         mutex_lock(&container->lock);
1289
1290         /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
1291                         iommu_group_id(iommu_group), iommu_group); */
1292         table_group = iommu_group_get_iommudata(iommu_group);
1293         if (!table_group) {
1294                 ret = -ENODEV;
1295                 goto unlock_exit;
1296         }
1297
1298         if (tce_groups_attached(container) && (!table_group->ops ||
1299                         !table_group->ops->take_ownership ||
1300                         !table_group->ops->release_ownership)) {
1301                 ret = -EBUSY;
1302                 goto unlock_exit;
1303         }
1304
1305         /* Check if new group has the same iommu_ops (i.e. compatible) */
1306         list_for_each_entry(tcegrp, &container->group_list, next) {
1307                 struct iommu_table_group *table_group_tmp;
1308
1309                 if (tcegrp->grp == iommu_group) {
1310                         pr_warn("tce_vfio: Group %d is already attached\n",
1311                                         iommu_group_id(iommu_group));
1312                         ret = -EBUSY;
1313                         goto unlock_exit;
1314                 }
1315                 table_group_tmp = iommu_group_get_iommudata(tcegrp->grp);
1316                 if (table_group_tmp->ops->create_table !=
1317                                 table_group->ops->create_table) {
1318                         pr_warn("tce_vfio: Group %d is incompatible with group %d\n",
1319                                         iommu_group_id(iommu_group),
1320                                         iommu_group_id(tcegrp->grp));
1321                         ret = -EPERM;
1322                         goto unlock_exit;
1323                 }
1324         }
1325
1326         tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL);
1327         if (!tcegrp) {
1328                 ret = -ENOMEM;
1329                 goto unlock_exit;
1330         }
1331
1332         if (!table_group->ops || !table_group->ops->take_ownership ||
1333                         !table_group->ops->release_ownership) {
1334                 if (container->v2) {
1335                         ret = -EPERM;
1336                         goto unlock_exit;
1337                 }
1338                 ret = tce_iommu_take_ownership(container, table_group);
1339         } else {
1340                 if (!container->v2) {
1341                         ret = -EPERM;
1342                         goto unlock_exit;
1343                 }
1344                 ret = tce_iommu_take_ownership_ddw(container, table_group);
1345                 if (!tce_groups_attached(container) && !container->tables[0])
1346                         container->def_window_pending = true;
1347         }
1348
1349         if (!ret) {
1350                 tcegrp->grp = iommu_group;
1351                 list_add(&tcegrp->next, &container->group_list);
1352         }
1353
1354 unlock_exit:
1355         if (ret && tcegrp)
1356                 kfree(tcegrp);
1357
1358         mutex_unlock(&container->lock);
1359
1360         return ret;
1361 }
1362
1363 static void tce_iommu_detach_group(void *iommu_data,
1364                 struct iommu_group *iommu_group)
1365 {
1366         struct tce_container *container = iommu_data;
1367         struct iommu_table_group *table_group;
1368         bool found = false;
1369         struct tce_iommu_group *tcegrp;
1370
1371         mutex_lock(&container->lock);
1372
1373         list_for_each_entry(tcegrp, &container->group_list, next) {
1374                 if (tcegrp->grp == iommu_group) {
1375                         found = true;
1376                         break;
1377                 }
1378         }
1379
1380         if (!found) {
1381                 pr_warn("tce_vfio: detaching unattached group #%u\n",
1382                                 iommu_group_id(iommu_group));
1383                 goto unlock_exit;
1384         }
1385
1386         list_del(&tcegrp->next);
1387         kfree(tcegrp);
1388
1389         table_group = iommu_group_get_iommudata(iommu_group);
1390         BUG_ON(!table_group);
1391
1392         if (!table_group->ops || !table_group->ops->release_ownership)
1393                 tce_iommu_release_ownership(container, table_group);
1394         else
1395                 tce_iommu_release_ownership_ddw(container, table_group);
1396
1397 unlock_exit:
1398         mutex_unlock(&container->lock);
1399 }
1400
1401 const struct vfio_iommu_driver_ops tce_iommu_driver_ops = {
1402         .name           = "iommu-vfio-powerpc",
1403         .owner          = THIS_MODULE,
1404         .open           = tce_iommu_open,
1405         .release        = tce_iommu_release,
1406         .ioctl          = tce_iommu_ioctl,
1407         .attach_group   = tce_iommu_attach_group,
1408         .detach_group   = tce_iommu_detach_group,
1409 };
1410
1411 static int __init tce_iommu_init(void)
1412 {
1413         return vfio_register_iommu_driver(&tce_iommu_driver_ops);
1414 }
1415
1416 static void __exit tce_iommu_cleanup(void)
1417 {
1418         vfio_unregister_iommu_driver(&tce_iommu_driver_ops);
1419 }
1420
1421 module_init(tce_iommu_init);
1422 module_exit(tce_iommu_cleanup);
1423
1424 MODULE_VERSION(DRIVER_VERSION);
1425 MODULE_LICENSE("GPL v2");
1426 MODULE_AUTHOR(DRIVER_AUTHOR);
1427 MODULE_DESCRIPTION(DRIVER_DESC);
1428