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         if (!tcemem) {
 202                 mm_iommu_put(container->mm, mem);
 203                 return -ENOMEM;
 204         }
 205
 206         tcemem->mem = mem;
 207         list_add(&tcemem->next, &container->prereg_list);
 208
 209         container->enabled = true;
 210
 211         return 0;
 212 }
 213
 214 static long tce_iommu_userspace_view_alloc(struct iommu_table *tbl,
 215                 struct mm_struct *mm)
 216 {
 217         unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) *
 218                         tbl->it_size, PAGE_SIZE);
 219         unsigned long *uas;
 220         long ret;
 221
 222         BUG_ON(tbl->it_userspace);
 223
 224         ret = try_increment_locked_vm(mm, cb >> PAGE_SHIFT);
 225         if (ret)
 226                 return ret;
 227
 228         uas = vzalloc(cb);
 229         if (!uas) {
 230                 decrement_locked_vm(mm, cb >> PAGE_SHIFT);
 231                 return -ENOMEM;
 232         }
 233         tbl->it_userspace = uas;
 234
 235         return 0;
 236 }
 237
 238 static void tce_iommu_userspace_view_free(struct iommu_table *tbl,
 239                 struct mm_struct *mm)
 240 {
 241         unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) *
 242                         tbl->it_size, PAGE_SIZE);
 243
 244         if (!tbl->it_userspace)
 245                 return;
 246
 247         vfree(tbl->it_userspace);
 248         tbl->it_userspace = NULL;
 249         decrement_locked_vm(mm, cb >> PAGE_SHIFT);
 250 }
 251
 252 static bool tce_page_is_contained(struct page *page, unsigned page_shift)
 253 {
 254         /*
 255          * Check that the TCE table granularity is not bigger than the size of
 256          * a page we just found. Otherwise the hardware can get access to
 257          * a bigger memory chunk that it should.
 258          */
 259         return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift;
 260 }
 261
 262 static inline bool tce_groups_attached(struct tce_container *container)
 263 {
 264         return !list_empty(&container->group_list);
 265 }
 266
 267 static long tce_iommu_find_table(struct tce_container *container,
 268                 phys_addr_t ioba, struct iommu_table **ptbl)
 269 {
 270         long i;
 271
 272         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
 273                 struct iommu_table *tbl = container->tables[i];
 274
 275                 if (tbl) {
 276                         unsigned long entry = ioba >> tbl->it_page_shift;
 277                         unsigned long start = tbl->it_offset;
 278                         unsigned long end = start + tbl->it_size;
 279
 280                         if ((start <= entry) && (entry < end)) {
 281                                 *ptbl = tbl;
 282                                 return i;
 283                         }
 284                 }
 285         }
 286
 287         return -1;
 288 }
 289
 290 static int tce_iommu_find_free_table(struct tce_container *container)
 291 {
 292         int i;
 293
 294         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
 295                 if (!container->tables[i])
 296                         return i;
 297         }
 298
 299         return -ENOSPC;
 300 }
 301
 302 static int tce_iommu_enable(struct tce_container *container)
 303 {
 304         int ret = 0;
 305         unsigned long locked;
 306         struct iommu_table_group *table_group;
 307         struct tce_iommu_group *tcegrp;
 308
 309         if (container->enabled)
 310                 return -EBUSY;
 311
 312         /*
 313          * When userspace pages are mapped into the IOMMU, they are effectively
 314          * locked memory, so, theoretically, we need to update the accounting
 315          * of locked pages on each map and unmap.  For powerpc, the map unmap
 316          * paths can be very hot, though, and the accounting would kill
 317          * performance, especially since it would be difficult to impossible
 318          * to handle the accounting in real mode only.
 319          *
 320          * To address that, rather than precisely accounting every page, we
 321          * instead account for a worst case on locked memory when the iommu is
 322          * enabled and disabled.  The worst case upper bound on locked memory
 323          * is the size of the whole iommu window, which is usually relatively
 324          * small (compared to total memory sizes) on POWER hardware.
 325          *
 326          * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits,
 327          * that would effectively kill the guest at random points, much better
 328          * enforcing the limit based on the max that the guest can map.
 329          *
 330          * Unfortunately at the moment it counts whole tables, no matter how
 331          * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups
 332          * each with 2GB DMA window, 8GB will be counted here. The reason for
 333          * this is that we cannot tell here the amount of RAM used by the guest
 334          * as this information is only available from KVM and VFIO is
 335          * KVM agnostic.
 336          *
 337          * So we do not allow enabling a container without a group attached
 338          * as there is no way to know how much we should increment
 339          * the locked_vm counter.
 340          */
 341         if (!tce_groups_attached(container))
 342                 return -ENODEV;
 343
 344         tcegrp = list_first_entry(&container->group_list,
 345                         struct tce_iommu_group, next);
 346         table_group = iommu_group_get_iommudata(tcegrp->grp);
 347         if (!table_group)
 348                 return -ENODEV;
 349
 350         if (!table_group->tce32_size)
 351                 return -EPERM;
 352
 353         ret = tce_iommu_mm_set(container);
 354         if (ret)
 355                 return ret;
 356
 357         locked = table_group->tce32_size >> PAGE_SHIFT;
 358         ret = try_increment_locked_vm(container->mm, locked);
 359         if (ret)
 360                 return ret;
 361
 362         container->locked_pages = locked;
 363
 364         container->enabled = true;
 365
 366         return ret;
 367 }
 368
 369 static void tce_iommu_disable(struct tce_container *container)
 370 {
 371         if (!container->enabled)
 372                 return;
 373
 374         container->enabled = false;
 375
 376         BUG_ON(!container->mm);
 377         decrement_locked_vm(container->mm, container->locked_pages);
 378 }
 379
 380 static void *tce_iommu_open(unsigned long arg)
 381 {
 382         struct tce_container *container;
 383
 384         if ((arg != VFIO_SPAPR_TCE_IOMMU) && (arg != VFIO_SPAPR_TCE_v2_IOMMU)) {
 385                 pr_err("tce_vfio: Wrong IOMMU type\n");
 386                 return ERR_PTR(-EINVAL);
 387         }
 388
 389         container = kzalloc(sizeof(*container), GFP_KERNEL);
 390         if (!container)
 391                 return ERR_PTR(-ENOMEM);
 392
 393         mutex_init(&container->lock);
 394         INIT_LIST_HEAD_RCU(&container->group_list);
 395         INIT_LIST_HEAD_RCU(&container->prereg_list);
 396
 397         container->v2 = arg == VFIO_SPAPR_TCE_v2_IOMMU;
 398
 399         return container;
 400 }
 401
 402 static int tce_iommu_clear(struct tce_container *container,
 403                 struct iommu_table *tbl,
 404                 unsigned long entry, unsigned long pages);
 405 static void tce_iommu_free_table(struct tce_container *container,
 406                 struct iommu_table *tbl);
 407
 408 static void tce_iommu_release(void *iommu_data)
 409 {
 410         struct tce_container *container = iommu_data;
 411         struct tce_iommu_group *tcegrp;
 412         long i;
 413
 414         while (tce_groups_attached(container)) {
 415                 tcegrp = list_first_entry(&container->group_list,
 416                                 struct tce_iommu_group, next);
 417                 tce_iommu_detach_group(iommu_data, tcegrp->grp);
 418         }
 419
 420         /*
 421          * If VFIO created a table, it was not disposed
 422          * by tce_iommu_detach_group() so do it now.
 423          */
 424         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
 425                 struct iommu_table *tbl = container->tables[i];
 426
 427                 if (!tbl)
 428                         continue;
 429
 430                 tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
 431                 tce_iommu_free_table(container, tbl);
 432         }
 433
 434         while (!list_empty(&container->prereg_list)) {
 435                 struct tce_iommu_prereg *tcemem;
 436
 437                 tcemem = list_first_entry(&container->prereg_list,
 438                                 struct tce_iommu_prereg, next);
 439                 WARN_ON_ONCE(tce_iommu_prereg_free(container, tcemem));
 440         }
 441
 442         tce_iommu_disable(container);
 443         if (container->mm)
 444                 mmdrop(container->mm);
 445         mutex_destroy(&container->lock);
 446
 447         kfree(container);
 448 }
 449
 450 static void tce_iommu_unuse_page(struct tce_container *container,
 451                 unsigned long hpa)
 452 {
 453         struct page *page;
 454
 455         page = pfn_to_page(hpa >> PAGE_SHIFT);
 456         put_page(page);
 457 }
 458
 459 static int tce_iommu_prereg_ua_to_hpa(struct tce_container *container,
 460                 unsigned long tce, unsigned long size,
 461                 unsigned long *phpa, struct mm_iommu_table_group_mem_t **pmem)
 462 {
 463         long ret = 0;
 464         struct mm_iommu_table_group_mem_t *mem;
 465
 466         mem = mm_iommu_lookup(container->mm, tce, size);
 467         if (!mem)
 468                 return -EINVAL;
 469
 470         ret = mm_iommu_ua_to_hpa(mem, tce, phpa);
 471         if (ret)
 472                 return -EINVAL;
 473
 474         *pmem = mem;
 475
 476         return 0;
 477 }
 478
 479 static void tce_iommu_unuse_page_v2(struct tce_container *container,
 480                 struct iommu_table *tbl, unsigned long entry)
 481 {
 482         struct mm_iommu_table_group_mem_t *mem = NULL;
 483         int ret;
 484         unsigned long hpa = 0;
 485         unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
 486
 487         if (!pua)
 488                 return;
 489
 490         ret = tce_iommu_prereg_ua_to_hpa(container, *pua, IOMMU_PAGE_SIZE(tbl),
 491                         &hpa, &mem);
 492         if (ret)
 493                 pr_debug("%s: tce %lx at #%lx was not cached, ret=%d\n",
 494                                 __func__, *pua, entry, ret);
 495         if (mem)
 496                 mm_iommu_mapped_dec(mem);
 497
 498         *pua = 0;
 499 }
 500
 501 static int tce_iommu_clear(struct tce_container *container,
 502                 struct iommu_table *tbl,
 503                 unsigned long entry, unsigned long pages)
 504 {
 505         unsigned long oldhpa;
 506         long ret;
 507         enum dma_data_direction direction;
 508
 509         for ( ; pages; --pages, ++entry) {
 510                 direction = DMA_NONE;
 511                 oldhpa = 0;
 512                 ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction);
 513                 if (ret)
 514                         continue;
 515
 516                 if (direction == DMA_NONE)
 517                         continue;
 518
 519                 if (container->v2) {
 520                         tce_iommu_unuse_page_v2(container, tbl, entry);
 521                         continue;
 522                 }
 523
 524                 tce_iommu_unuse_page(container, oldhpa);
 525         }
 526
 527         return 0;
 528 }
 529
 530 static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa)
 531 {
 532         struct page *page = NULL;
 533         enum dma_data_direction direction = iommu_tce_direction(tce);
 534
 535         if (get_user_pages_fast(tce & PAGE_MASK, 1,
 536                         direction != DMA_TO_DEVICE, &page) != 1)
 537                 return -EFAULT;
 538
 539         *hpa = __pa((unsigned long) page_address(page));
 540
 541         return 0;
 542 }
 543
 544 static long tce_iommu_build(struct tce_container *container,
 545                 struct iommu_table *tbl,
 546                 unsigned long entry, unsigned long tce, unsigned long pages,
 547                 enum dma_data_direction direction)
 548 {
 549         long i, ret = 0;
 550         struct page *page;
 551         unsigned long hpa;
 552         enum dma_data_direction dirtmp;
 553
 554         for (i = 0; i < pages; ++i) {
 555                 unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
 556
 557                 ret = tce_iommu_use_page(tce, &hpa);
 558                 if (ret)
 559                         break;
 560
 561                 page = pfn_to_page(hpa >> PAGE_SHIFT);
 562                 if (!tce_page_is_contained(page, tbl->it_page_shift)) {
 563                         ret = -EPERM;
 564                         break;
 565                 }
 566
 567                 hpa |= offset;
 568                 dirtmp = direction;
 569                 ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp);
 570                 if (ret) {
 571                         tce_iommu_unuse_page(container, hpa);
 572                         pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
 573                                         __func__, entry << tbl->it_page_shift,
 574                                         tce, ret);
 575                         break;
 576                 }
 577
 578                 if (dirtmp != DMA_NONE)
 579                         tce_iommu_unuse_page(container, hpa);
 580
 581                 tce += IOMMU_PAGE_SIZE(tbl);
 582         }
 583
 584         if (ret)
 585                 tce_iommu_clear(container, tbl, entry, i);
 586
 587         return ret;
 588 }
 589
 590 static long tce_iommu_build_v2(struct tce_container *container,
 591                 struct iommu_table *tbl,
 592                 unsigned long entry, unsigned long tce, unsigned long pages,
 593                 enum dma_data_direction direction)
 594 {
 595         long i, ret = 0;
 596         struct page *page;
 597         unsigned long hpa;
 598         enum dma_data_direction dirtmp;
 599
 600         if (!tbl->it_userspace) {
 601                 ret = tce_iommu_userspace_view_alloc(tbl, container->mm);
 602                 if (ret)
 603                         return ret;
 604         }
 605
 606         for (i = 0; i < pages; ++i) {
 607                 struct mm_iommu_table_group_mem_t *mem = NULL;
 608                 unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl,
 609                                 entry + i);
 610
 611                 ret = tce_iommu_prereg_ua_to_hpa(container,
 612                                 tce, IOMMU_PAGE_SIZE(tbl), &hpa, &mem);
 613                 if (ret)
 614                         break;
 615
 616                 page = pfn_to_page(hpa >> PAGE_SHIFT);
 617                 if (!tce_page_is_contained(page, tbl->it_page_shift)) {
 618                         ret = -EPERM;
 619                         break;
 620                 }
 621
 622                 /* Preserve offset within IOMMU page */
 623                 hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
 624                 dirtmp = direction;
 625
 626                 /* The registered region is being unregistered */
 627                 if (mm_iommu_mapped_inc(mem))
 628                         break;
 629
 630                 ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp);
 631                 if (ret) {
 632                         /* dirtmp cannot be DMA_NONE here */
 633                         tce_iommu_unuse_page_v2(container, tbl, entry + i);
 634                         pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
 635                                         __func__, entry << tbl->it_page_shift,
 636                                         tce, ret);
 637                         break;
 638                 }
 639
 640                 if (dirtmp != DMA_NONE)
 641                         tce_iommu_unuse_page_v2(container, tbl, entry + i);
 642
 643                 *pua = tce;
 644
 645                 tce += IOMMU_PAGE_SIZE(tbl);
 646         }
 647
 648         if (ret)
 649                 tce_iommu_clear(container, tbl, entry, i);
 650
 651         return ret;
 652 }
 653
 654 static long tce_iommu_create_table(struct tce_container *container,
 655                         struct iommu_table_group *table_group,
 656                         int num,
 657                         __u32 page_shift,
 658                         __u64 window_size,
 659                         __u32 levels,
 660                         struct iommu_table **ptbl)
 661 {
 662         long ret, table_size;
 663
 664         table_size = table_group->ops->get_table_size(page_shift, window_size,
 665                         levels);
 666         if (!table_size)
 667                 return -EINVAL;
 668
 669         ret = try_increment_locked_vm(container->mm, table_size >> PAGE_SHIFT);
 670         if (ret)
 671                 return ret;
 672
 673         ret = table_group->ops->create_table(table_group, num,
 674                         page_shift, window_size, levels, ptbl);
 675
 676         WARN_ON(!ret && !(*ptbl)->it_ops->free);
 677         WARN_ON(!ret && ((*ptbl)->it_allocated_size != table_size));
 678
 679         return ret;
 680 }
 681
 682 static void tce_iommu_free_table(struct tce_container *container,
 683                 struct iommu_table *tbl)
 684 {
 685         unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT;
 686
 687         tce_iommu_userspace_view_free(tbl, container->mm);
 688         iommu_tce_table_put(tbl);
 689         decrement_locked_vm(container->mm, pages);
 690 }
 691
 692 static long tce_iommu_create_window(struct tce_container *container,
 693                 __u32 page_shift, __u64 window_size, __u32 levels,
 694                 __u64 *start_addr)
 695 {
 696         struct tce_iommu_group *tcegrp;
 697         struct iommu_table_group *table_group;
 698         struct iommu_table *tbl = NULL;
 699         long ret, num;
 700
 701         num = tce_iommu_find_free_table(container);
 702         if (num < 0)
 703                 return num;
 704
 705         /* Get the first group for ops::create_table */
 706         tcegrp = list_first_entry(&container->group_list,
 707                         struct tce_iommu_group, next);
 708         table_group = iommu_group_get_iommudata(tcegrp->grp);
 709         if (!table_group)
 710                 return -EFAULT;
 711
 712         if (!(table_group->pgsizes & (1ULL << page_shift)))
 713                 return -EINVAL;
 714
 715         if (!table_group->ops->set_window || !table_group->ops->unset_window ||
 716                         !table_group->ops->get_table_size ||
 717                         !table_group->ops->create_table)
 718                 return -EPERM;
 719
 720         /* Create TCE table */
 721         ret = tce_iommu_create_table(container, table_group, num,
 722                         page_shift, window_size, levels, &tbl);
 723         if (ret)
 724                 return ret;
 725
 726         BUG_ON(!tbl->it_ops->free);
 727
 728         /*
 729          * Program the table to every group.
 730          * Groups have been tested for compatibility at the attach time.
 731          */
 732         list_for_each_entry(tcegrp, &container->group_list, next) {
 733                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 734
 735                 ret = table_group->ops->set_window(table_group, num, tbl);
 736                 if (ret)
 737                         goto unset_exit;
 738         }
 739
 740         container->tables[num] = tbl;
 741
 742         /* Return start address assigned by platform in create_table() */
 743         *start_addr = tbl->it_offset << tbl->it_page_shift;
 744
 745         return 0;
 746
 747 unset_exit:
 748         list_for_each_entry(tcegrp, &container->group_list, next) {
 749                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 750                 table_group->ops->unset_window(table_group, num);
 751         }
 752         tce_iommu_free_table(container, tbl);
 753
 754         return ret;
 755 }
 756
 757 static long tce_iommu_remove_window(struct tce_container *container,
 758                 __u64 start_addr)
 759 {
 760         struct iommu_table_group *table_group = NULL;
 761         struct iommu_table *tbl;
 762         struct tce_iommu_group *tcegrp;
 763         int num;
 764
 765         num = tce_iommu_find_table(container, start_addr, &tbl);
 766         if (num < 0)
 767                 return -EINVAL;
 768
 769         BUG_ON(!tbl->it_size);
 770
 771         /* Detach groups from IOMMUs */
 772         list_for_each_entry(tcegrp, &container->group_list, next) {
 773                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 774
 775                 /*
 776                  * SPAPR TCE IOMMU exposes the default DMA window to
 777                  * the guest via dma32_window_start/size of
 778                  * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow
 779                  * the userspace to remove this window, some do not so
 780                  * here we check for the platform capability.
 781                  */
 782                 if (!table_group->ops || !table_group->ops->unset_window)
 783                         return -EPERM;
 784
 785                 table_group->ops->unset_window(table_group, num);
 786         }
 787
 788         /* Free table */
 789         tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
 790         tce_iommu_free_table(container, tbl);
 791         container->tables[num] = NULL;
 792
 793         return 0;
 794 }
 795
 796 static long tce_iommu_create_default_window(struct tce_container *container)
 797 {
 798         long ret;
 799         __u64 start_addr = 0;
 800         struct tce_iommu_group *tcegrp;
 801         struct iommu_table_group *table_group;
 802
 803         if (!container->def_window_pending)
 804                 return 0;
 805
 806         if (!tce_groups_attached(container))
 807                 return -ENODEV;
 808
 809         tcegrp = list_first_entry(&container->group_list,
 810                         struct tce_iommu_group, next);
 811         table_group = iommu_group_get_iommudata(tcegrp->grp);
 812         if (!table_group)
 813                 return -ENODEV;
 814
 815         ret = tce_iommu_create_window(container, IOMMU_PAGE_SHIFT_4K,
 816                         table_group->tce32_size, 1, &start_addr);
 817         WARN_ON_ONCE(!ret && start_addr);
 818
 819         if (!ret)
 820                 container->def_window_pending = false;
 821
 822         return ret;
 823 }
 824
 825 static long tce_iommu_ioctl(void *iommu_data,
 826                                  unsigned int cmd, unsigned long arg)
 827 {
 828         struct tce_container *container = iommu_data;
 829         unsigned long minsz, ddwsz;
 830         long ret;
 831
 832         switch (cmd) {
 833         case VFIO_CHECK_EXTENSION:
 834                 switch (arg) {
 835                 case VFIO_SPAPR_TCE_IOMMU:
 836                 case VFIO_SPAPR_TCE_v2_IOMMU:
 837                         ret = 1;
 838                         break;
 839                 default:
 840                         ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg);
 841                         break;
 842                 }
 843
 844                 return (ret < 0) ? 0 : ret;
 845         }
 846
 847         /*
 848          * Sanity check to prevent one userspace from manipulating
 849          * another userspace mm.
 850          */
 851         BUG_ON(!container);
 852         if (container->mm && container->mm != current->mm)
 853                 return -EPERM;
 854
 855         switch (cmd) {
 856         case VFIO_IOMMU_SPAPR_TCE_GET_INFO: {
 857                 struct vfio_iommu_spapr_tce_info info;
 858                 struct tce_iommu_group *tcegrp;
 859                 struct iommu_table_group *table_group;
 860
 861                 if (!tce_groups_attached(container))
 862                         return -ENXIO;
 863
 864                 tcegrp = list_first_entry(&container->group_list,
 865                                 struct tce_iommu_group, next);
 866                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 867
 868                 if (!table_group)
 869                         return -ENXIO;
 870
 871                 minsz = offsetofend(struct vfio_iommu_spapr_tce_info,
 872                                 dma32_window_size);
 873
 874                 if (copy_from_user(&info, (void __user *)arg, minsz))
 875                         return -EFAULT;
 876
 877                 if (info.argsz < minsz)
 878                         return -EINVAL;
 879
 880                 info.dma32_window_start = table_group->tce32_start;
 881                 info.dma32_window_size = table_group->tce32_size;
 882                 info.flags = 0;
 883                 memset(&info.ddw, 0, sizeof(info.ddw));
 884
 885                 if (table_group->max_dynamic_windows_supported &&
 886                                 container->v2) {
 887                         info.flags |= VFIO_IOMMU_SPAPR_INFO_DDW;
 888                         info.ddw.pgsizes = table_group->pgsizes;
 889                         info.ddw.max_dynamic_windows_supported =
 890                                 table_group->max_dynamic_windows_supported;
 891                         info.ddw.levels = table_group->max_levels;
 892                 }
 893
 894                 ddwsz = offsetofend(struct vfio_iommu_spapr_tce_info, ddw);
 895
 896                 if (info.argsz >= ddwsz)
 897                         minsz = ddwsz;
 898
 899                 if (copy_to_user((void __user *)arg, &info, minsz))
 900                         return -EFAULT;
 901
 902                 return 0;
 903         }
 904         case VFIO_IOMMU_MAP_DMA: {
 905                 struct vfio_iommu_type1_dma_map param;
 906                 struct iommu_table *tbl = NULL;
 907                 long num;
 908                 enum dma_data_direction direction;
 909
 910                 if (!container->enabled)
 911                         return -EPERM;
 912
 913                 minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
 914
 915                 if (copy_from_user(&param, (void __user *)arg, minsz))
 916                         return -EFAULT;
 917
 918                 if (param.argsz < minsz)
 919                         return -EINVAL;
 920
 921                 if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ |
 922                                 VFIO_DMA_MAP_FLAG_WRITE))
 923                         return -EINVAL;
 924
 925                 ret = tce_iommu_create_default_window(container);
 926                 if (ret)
 927                         return ret;
 928
 929                 num = tce_iommu_find_table(container, param.iova, &tbl);
 930                 if (num < 0)
 931                         return -ENXIO;
 932
 933                 if ((param.size & ~IOMMU_PAGE_MASK(tbl)) ||
 934                                 (param.vaddr & ~IOMMU_PAGE_MASK(tbl)))
 935                         return -EINVAL;
 936
 937                 /* iova is checked by the IOMMU API */
 938                 if (param.flags & VFIO_DMA_MAP_FLAG_READ) {
 939                         if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
 940                                 direction = DMA_BIDIRECTIONAL;
 941                         else
 942                                 direction = DMA_TO_DEVICE;
 943                 } else {
 944                         if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
 945                                 direction = DMA_FROM_DEVICE;
 946                         else
 947                                 return -EINVAL;
 948                 }
 949
 950                 ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr);
 951                 if (ret)
 952                         return ret;
 953
 954                 if (container->v2)
 955                         ret = tce_iommu_build_v2(container, tbl,
 956                                         param.iova >> tbl->it_page_shift,
 957                                         param.vaddr,
 958                                         param.size >> tbl->it_page_shift,
 959                                         direction);
 960                 else
 961                         ret = tce_iommu_build(container, tbl,
 962                                         param.iova >> tbl->it_page_shift,
 963                                         param.vaddr,
 964                                         param.size >> tbl->it_page_shift,
 965                                         direction);
 966
 967                 iommu_flush_tce(tbl);
 968
 969                 return ret;
 970         }
 971         case VFIO_IOMMU_UNMAP_DMA: {
 972                 struct vfio_iommu_type1_dma_unmap param;
 973                 struct iommu_table *tbl = NULL;
 974                 long num;
 975
 976                 if (!container->enabled)
 977                         return -EPERM;
 978
 979                 minsz = offsetofend(struct vfio_iommu_type1_dma_unmap,
 980                                 size);
 981
 982                 if (copy_from_user(&param, (void __user *)arg, minsz))
 983                         return -EFAULT;
 984
 985                 if (param.argsz < minsz)
 986                         return -EINVAL;
 987
 988                 /* No flag is supported now */
 989                 if (param.flags)
 990                         return -EINVAL;
 991
 992                 ret = tce_iommu_create_default_window(container);
 993                 if (ret)
 994                         return ret;
 995
 996                 num = tce_iommu_find_table(container, param.iova, &tbl);
 997                 if (num < 0)
 998                         return -ENXIO;
 999
1000                 if (param.size & ~IOMMU_PAGE_MASK(tbl))
1001                         return -EINVAL;
1002
1003                 ret = iommu_tce_clear_param_check(tbl, param.iova, 0,
1004                                 param.size >> tbl->it_page_shift);
1005                 if (ret)
1006                         return ret;
1007
1008                 ret = tce_iommu_clear(container, tbl,
1009                                 param.iova >> tbl->it_page_shift,
1010                                 param.size >> tbl->it_page_shift);
1011                 iommu_flush_tce(tbl);
1012
1013                 return ret;
1014         }
1015         case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: {
1016                 struct vfio_iommu_spapr_register_memory param;
1017
1018                 if (!container->v2)
1019                         break;
1020
1021                 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
1022                                 size);
1023
1024                 ret = tce_iommu_mm_set(container);
1025                 if (ret)
1026                         return ret;
1027
1028                 if (copy_from_user(&param, (void __user *)arg, minsz))
1029                         return -EFAULT;
1030
1031                 if (param.argsz < minsz)
1032                         return -EINVAL;
1033
1034                 /* No flag is supported now */
1035                 if (param.flags)
1036                         return -EINVAL;
1037
1038                 mutex_lock(&container->lock);
1039                 ret = tce_iommu_register_pages(container, param.vaddr,
1040                                 param.size);
1041                 mutex_unlock(&container->lock);
1042
1043                 return ret;
1044         }
1045         case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: {
1046                 struct vfio_iommu_spapr_register_memory param;
1047
1048                 if (!container->v2)
1049                         break;
1050
1051                 if (!container->mm)
1052                         return -EPERM;
1053
1054                 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
1055                                 size);
1056
1057                 if (copy_from_user(&param, (void __user *)arg, minsz))
1058                         return -EFAULT;
1059
1060                 if (param.argsz < minsz)
1061                         return -EINVAL;
1062
1063                 /* No flag is supported now */
1064                 if (param.flags)
1065                         return -EINVAL;
1066
1067                 mutex_lock(&container->lock);
1068                 ret = tce_iommu_unregister_pages(container, param.vaddr,
1069                                 param.size);
1070                 mutex_unlock(&container->lock);
1071
1072                 return ret;
1073         }
1074         case VFIO_IOMMU_ENABLE:
1075                 if (container->v2)
1076                         break;
1077
1078                 mutex_lock(&container->lock);
1079                 ret = tce_iommu_enable(container);
1080                 mutex_unlock(&container->lock);
1081                 return ret;
1082
1083
1084         case VFIO_IOMMU_DISABLE:
1085                 if (container->v2)
1086                         break;
1087
1088                 mutex_lock(&container->lock);
1089                 tce_iommu_disable(container);
1090                 mutex_unlock(&container->lock);
1091                 return 0;
1092
1093         case VFIO_EEH_PE_OP: {
1094                 struct tce_iommu_group *tcegrp;
1095
1096                 ret = 0;
1097                 list_for_each_entry(tcegrp, &container->group_list, next) {
1098                         ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp,
1099                                         cmd, arg);
1100                         if (ret)
1101                                 return ret;
1102                 }
1103                 return ret;
1104         }
1105
1106         case VFIO_IOMMU_SPAPR_TCE_CREATE: {
1107                 struct vfio_iommu_spapr_tce_create create;
1108
1109                 if (!container->v2)
1110                         break;
1111
1112                 ret = tce_iommu_mm_set(container);
1113                 if (ret)
1114                         return ret;
1115
1116                 if (!tce_groups_attached(container))
1117                         return -ENXIO;
1118
1119                 minsz = offsetofend(struct vfio_iommu_spapr_tce_create,
1120                                 start_addr);
1121
1122                 if (copy_from_user(&create, (void __user *)arg, minsz))
1123                         return -EFAULT;
1124
1125                 if (create.argsz < minsz)
1126                         return -EINVAL;
1127
1128                 if (create.flags)
1129                         return -EINVAL;
1130
1131                 mutex_lock(&container->lock);
1132
1133                 ret = tce_iommu_create_default_window(container);
1134                 if (!ret)
1135                         ret = tce_iommu_create_window(container,
1136                                         create.page_shift,
1137                                         create.window_size, create.levels,
1138                                         &create.start_addr);
1139
1140                 mutex_unlock(&container->lock);
1141
1142                 if (!ret && copy_to_user((void __user *)arg, &create, minsz))
1143                         ret = -EFAULT;
1144
1145                 return ret;
1146         }
1147         case VFIO_IOMMU_SPAPR_TCE_REMOVE: {
1148                 struct vfio_iommu_spapr_tce_remove remove;
1149
1150                 if (!container->v2)
1151                         break;
1152
1153                 ret = tce_iommu_mm_set(container);
1154                 if (ret)
1155                         return ret;
1156
1157                 if (!tce_groups_attached(container))
1158                         return -ENXIO;
1159
1160                 minsz = offsetofend(struct vfio_iommu_spapr_tce_remove,
1161                                 start_addr);
1162
1163                 if (copy_from_user(&remove, (void __user *)arg, minsz))
1164                         return -EFAULT;
1165
1166                 if (remove.argsz < minsz)
1167                         return -EINVAL;
1168
1169                 if (remove.flags)
1170                         return -EINVAL;
1171
1172                 if (container->def_window_pending && !remove.start_addr) {
1173                         container->def_window_pending = false;
1174                         return 0;
1175                 }
1176
1177                 mutex_lock(&container->lock);
1178
1179                 ret = tce_iommu_remove_window(container, remove.start_addr);
1180
1181                 mutex_unlock(&container->lock);
1182
1183                 return ret;
1184         }
1185         }
1186
1187         return -ENOTTY;
1188 }
1189
1190 static void tce_iommu_release_ownership(struct tce_container *container,
1191                 struct iommu_table_group *table_group)
1192 {
1193         int i;
1194
1195         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1196                 struct iommu_table *tbl = container->tables[i];
1197
1198                 if (!tbl)
1199                         continue;
1200
1201                 tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
1202                 tce_iommu_userspace_view_free(tbl, container->mm);
1203                 if (tbl->it_map)
1204                         iommu_release_ownership(tbl);
1205
1206                 container->tables[i] = NULL;
1207         }
1208 }
1209
1210 static int tce_iommu_take_ownership(struct tce_container *container,
1211                 struct iommu_table_group *table_group)
1212 {
1213         int i, j, rc = 0;
1214
1215         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1216                 struct iommu_table *tbl = table_group->tables[i];
1217
1218                 if (!tbl || !tbl->it_map)
1219                         continue;
1220
1221                 rc = iommu_take_ownership(tbl);
1222                 if (rc) {
1223                         for (j = 0; j < i; ++j)
1224                                 iommu_release_ownership(
1225                                                 table_group->tables[j]);
1226
1227                         return rc;
1228                 }
1229         }
1230
1231         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1232                 container->tables[i] = table_group->tables[i];
1233
1234         return 0;
1235 }
1236
1237 static void tce_iommu_release_ownership_ddw(struct tce_container *container,
1238                 struct iommu_table_group *table_group)
1239 {
1240         long i;
1241
1242         if (!table_group->ops->unset_window) {
1243                 WARN_ON_ONCE(1);
1244                 return;
1245         }
1246
1247         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1248                 table_group->ops->unset_window(table_group, i);
1249
1250         table_group->ops->release_ownership(table_group);
1251 }
1252
1253 static long tce_iommu_take_ownership_ddw(struct tce_container *container,
1254                 struct iommu_table_group *table_group)
1255 {
1256         long i, ret = 0;
1257
1258         if (!table_group->ops->create_table || !table_group->ops->set_window ||
1259                         !table_group->ops->release_ownership) {
1260                 WARN_ON_ONCE(1);
1261                 return -EFAULT;
1262         }
1263
1264         table_group->ops->take_ownership(table_group);
1265
1266         /* Set all windows to the new group */
1267         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1268                 struct iommu_table *tbl = container->tables[i];
1269
1270                 if (!tbl)
1271                         continue;
1272
1273                 ret = table_group->ops->set_window(table_group, i, tbl);
1274                 if (ret)
1275                         goto release_exit;
1276         }
1277
1278         return 0;
1279
1280 release_exit:
1281         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1282                 table_group->ops->unset_window(table_group, i);
1283
1284         table_group->ops->release_ownership(table_group);
1285
1286         return ret;
1287 }
1288
1289 static int tce_iommu_attach_group(void *iommu_data,
1290                 struct iommu_group *iommu_group)
1291 {
1292         int ret;
1293         struct tce_container *container = iommu_data;
1294         struct iommu_table_group *table_group;
1295         struct tce_iommu_group *tcegrp = NULL;
1296
1297         mutex_lock(&container->lock);
1298
1299         /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
1300                         iommu_group_id(iommu_group), iommu_group); */
1301         table_group = iommu_group_get_iommudata(iommu_group);
1302         if (!table_group) {
1303                 ret = -ENODEV;
1304                 goto unlock_exit;
1305         }
1306
1307         if (tce_groups_attached(container) && (!table_group->ops ||
1308                         !table_group->ops->take_ownership ||
1309                         !table_group->ops->release_ownership)) {
1310                 ret = -EBUSY;
1311                 goto unlock_exit;
1312         }
1313
1314         /* Check if new group has the same iommu_ops (i.e. compatible) */
1315         list_for_each_entry(tcegrp, &container->group_list, next) {
1316                 struct iommu_table_group *table_group_tmp;
1317
1318                 if (tcegrp->grp == iommu_group) {
1319                         pr_warn("tce_vfio: Group %d is already attached\n",
1320                                         iommu_group_id(iommu_group));
1321                         ret = -EBUSY;
1322                         goto unlock_exit;
1323                 }
1324                 table_group_tmp = iommu_group_get_iommudata(tcegrp->grp);
1325                 if (table_group_tmp->ops->create_table !=
1326                                 table_group->ops->create_table) {
1327                         pr_warn("tce_vfio: Group %d is incompatible with group %d\n",
1328                                         iommu_group_id(iommu_group),
1329                                         iommu_group_id(tcegrp->grp));
1330                         ret = -EPERM;
1331                         goto unlock_exit;
1332                 }
1333         }
1334
1335         tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL);
1336         if (!tcegrp) {
1337                 ret = -ENOMEM;
1338                 goto unlock_exit;
1339         }
1340
1341         if (!table_group->ops || !table_group->ops->take_ownership ||
1342                         !table_group->ops->release_ownership) {
1343                 if (container->v2) {
1344                         ret = -EPERM;
1345                         goto unlock_exit;
1346                 }
1347                 ret = tce_iommu_take_ownership(container, table_group);
1348         } else {
1349                 if (!container->v2) {
1350                         ret = -EPERM;
1351                         goto unlock_exit;
1352                 }
1353                 ret = tce_iommu_take_ownership_ddw(container, table_group);
1354                 if (!tce_groups_attached(container) && !container->tables[0])
1355                         container->def_window_pending = true;
1356         }
1357
1358         if (!ret) {
1359                 tcegrp->grp = iommu_group;
1360                 list_add(&tcegrp->next, &container->group_list);
1361         }
1362
1363 unlock_exit:
1364         if (ret && tcegrp)
1365                 kfree(tcegrp);
1366
1367         mutex_unlock(&container->lock);
1368
1369         return ret;
1370 }
1371
1372 static void tce_iommu_detach_group(void *iommu_data,
1373                 struct iommu_group *iommu_group)
1374 {
1375         struct tce_container *container = iommu_data;
1376         struct iommu_table_group *table_group;
1377         bool found = false;
1378         struct tce_iommu_group *tcegrp;
1379
1380         mutex_lock(&container->lock);
1381
1382         list_for_each_entry(tcegrp, &container->group_list, next) {
1383                 if (tcegrp->grp == iommu_group) {
1384                         found = true;
1385                         break;
1386                 }
1387         }
1388
1389         if (!found) {
1390                 pr_warn("tce_vfio: detaching unattached group #%u\n",
1391                                 iommu_group_id(iommu_group));
1392                 goto unlock_exit;
1393         }
1394
1395         list_del(&tcegrp->next);
1396         kfree(tcegrp);
1397
1398         table_group = iommu_group_get_iommudata(iommu_group);
1399         BUG_ON(!table_group);
1400
1401         if (!table_group->ops || !table_group->ops->release_ownership)
1402                 tce_iommu_release_ownership(container, table_group);
1403         else
1404                 tce_iommu_release_ownership_ddw(container, table_group);
1405
1406 unlock_exit:
1407         mutex_unlock(&container->lock);
1408 }
1409
1410 const struct vfio_iommu_driver_ops tce_iommu_driver_ops = {
1411         .name           = "iommu-vfio-powerpc",
1412         .owner          = THIS_MODULE,
1413         .open           = tce_iommu_open,
1414         .release        = tce_iommu_release,
1415         .ioctl          = tce_iommu_ioctl,
1416         .attach_group   = tce_iommu_attach_group,
1417         .detach_group   = tce_iommu_detach_group,
1418 };
1419
1420 static int __init tce_iommu_init(void)
1421 {
1422         return vfio_register_iommu_driver(&tce_iommu_driver_ops);
1423 }
1424
1425 static void __exit tce_iommu_cleanup(void)
1426 {
1427         vfio_unregister_iommu_driver(&tce_iommu_driver_ops);
1428 }
1429
1430 module_init(tce_iommu_init);
1431 module_exit(tce_iommu_cleanup);
1432
1433 MODULE_VERSION(DRIVER_VERSION);
1434 MODULE_LICENSE("GPL v2");
1435 MODULE_AUTHOR(DRIVER_AUTHOR);
1436 MODULE_DESCRIPTION(DRIVER_DESC);
1437