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