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 shift,
 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, 1ULL << shift);
 467         if (!mem)
 468                 return -EINVAL;
 469
 470         ret = mm_iommu_ua_to_hpa(mem, tce, shift, 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, tbl->it_page_shift,
 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                 cond_resched();
 511
 512                 direction = DMA_NONE;
 513                 oldhpa = 0;
 514                 ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction);
 515                 if (ret)
 516                         continue;
 517
 518                 if (direction == DMA_NONE)
 519                         continue;
 520
 521                 if (container->v2) {
 522                         tce_iommu_unuse_page_v2(container, tbl, entry);
 523                         continue;
 524                 }
 525
 526                 tce_iommu_unuse_page(container, oldhpa);
 527         }
 528
 529         return 0;
 530 }
 531
 532 static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa)
 533 {
 534         struct page *page = NULL;
 535         enum dma_data_direction direction = iommu_tce_direction(tce);
 536
 537         if (get_user_pages_fast(tce & PAGE_MASK, 1,
 538                         direction != DMA_TO_DEVICE, &page) != 1)
 539                 return -EFAULT;
 540
 541         *hpa = __pa((unsigned long) page_address(page));
 542
 543         return 0;
 544 }
 545
 546 static long tce_iommu_build(struct tce_container *container,
 547                 struct iommu_table *tbl,
 548                 unsigned long entry, unsigned long tce, unsigned long pages,
 549                 enum dma_data_direction direction)
 550 {
 551         long i, ret = 0;
 552         struct page *page;
 553         unsigned long hpa;
 554         enum dma_data_direction dirtmp;
 555
 556         for (i = 0; i < pages; ++i) {
 557                 unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
 558
 559                 ret = tce_iommu_use_page(tce, &hpa);
 560                 if (ret)
 561                         break;
 562
 563                 page = pfn_to_page(hpa >> PAGE_SHIFT);
 564                 if (!tce_page_is_contained(page, tbl->it_page_shift)) {
 565                         ret = -EPERM;
 566                         break;
 567                 }
 568
 569                 hpa |= offset;
 570                 dirtmp = direction;
 571                 ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp);
 572                 if (ret) {
 573                         tce_iommu_unuse_page(container, hpa);
 574                         pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
 575                                         __func__, entry << tbl->it_page_shift,
 576                                         tce, ret);
 577                         break;
 578                 }
 579
 580                 if (dirtmp != DMA_NONE)
 581                         tce_iommu_unuse_page(container, hpa);
 582
 583                 tce += IOMMU_PAGE_SIZE(tbl);
 584         }
 585
 586         if (ret)
 587                 tce_iommu_clear(container, tbl, entry, i);
 588
 589         return ret;
 590 }
 591
 592 static long tce_iommu_build_v2(struct tce_container *container,
 593                 struct iommu_table *tbl,
 594                 unsigned long entry, unsigned long tce, unsigned long pages,
 595                 enum dma_data_direction direction)
 596 {
 597         long i, ret = 0;
 598         struct page *page;
 599         unsigned long hpa;
 600         enum dma_data_direction dirtmp;
 601
 602         if (!tbl->it_userspace) {
 603                 ret = tce_iommu_userspace_view_alloc(tbl, container->mm);
 604                 if (ret)
 605                         return ret;
 606         }
 607
 608         for (i = 0; i < pages; ++i) {
 609                 struct mm_iommu_table_group_mem_t *mem = NULL;
 610                 unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl,
 611                                 entry + i);
 612
 613                 ret = tce_iommu_prereg_ua_to_hpa(container,
 614                                 tce, tbl->it_page_shift, &hpa, &mem);
 615                 if (ret)
 616                         break;
 617
 618                 page = pfn_to_page(hpa >> PAGE_SHIFT);
 619                 if (!tce_page_is_contained(page, tbl->it_page_shift)) {
 620                         ret = -EPERM;
 621                         break;
 622                 }
 623
 624                 /* Preserve offset within IOMMU page */
 625                 hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
 626                 dirtmp = direction;
 627
 628                 /* The registered region is being unregistered */
 629                 if (mm_iommu_mapped_inc(mem))
 630                         break;
 631
 632                 ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp);
 633                 if (ret) {
 634                         /* dirtmp cannot be DMA_NONE here */
 635                         tce_iommu_unuse_page_v2(container, tbl, entry + i);
 636                         pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
 637                                         __func__, entry << tbl->it_page_shift,
 638                                         tce, ret);
 639                         break;
 640                 }
 641
 642                 if (dirtmp != DMA_NONE)
 643                         tce_iommu_unuse_page_v2(container, tbl, entry + i);
 644
 645                 *pua = tce;
 646
 647                 tce += IOMMU_PAGE_SIZE(tbl);
 648         }
 649
 650         if (ret)
 651                 tce_iommu_clear(container, tbl, entry, i);
 652
 653         return ret;
 654 }
 655
 656 static long tce_iommu_create_table(struct tce_container *container,
 657                         struct iommu_table_group *table_group,
 658                         int num,
 659                         __u32 page_shift,
 660                         __u64 window_size,
 661                         __u32 levels,
 662                         struct iommu_table **ptbl)
 663 {
 664         long ret, table_size;
 665
 666         table_size = table_group->ops->get_table_size(page_shift, window_size,
 667                         levels);
 668         if (!table_size)
 669                 return -EINVAL;
 670
 671         ret = try_increment_locked_vm(container->mm, table_size >> PAGE_SHIFT);
 672         if (ret)
 673                 return ret;
 674
 675         ret = table_group->ops->create_table(table_group, num,
 676                         page_shift, window_size, levels, ptbl);
 677
 678         WARN_ON(!ret && !(*ptbl)->it_ops->free);
 679         WARN_ON(!ret && ((*ptbl)->it_allocated_size != table_size));
 680
 681         return ret;
 682 }
 683
 684 static void tce_iommu_free_table(struct tce_container *container,
 685                 struct iommu_table *tbl)
 686 {
 687         unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT;
 688
 689         tce_iommu_userspace_view_free(tbl, container->mm);
 690         iommu_tce_table_put(tbl);
 691         decrement_locked_vm(container->mm, pages);
 692 }
 693
 694 static long tce_iommu_create_window(struct tce_container *container,
 695                 __u32 page_shift, __u64 window_size, __u32 levels,
 696                 __u64 *start_addr)
 697 {
 698         struct tce_iommu_group *tcegrp;
 699         struct iommu_table_group *table_group;
 700         struct iommu_table *tbl = NULL;
 701         long ret, num;
 702
 703         num = tce_iommu_find_free_table(container);
 704         if (num < 0)
 705                 return num;
 706
 707         /* Get the first group for ops::create_table */
 708         tcegrp = list_first_entry(&container->group_list,
 709                         struct tce_iommu_group, next);
 710         table_group = iommu_group_get_iommudata(tcegrp->grp);
 711         if (!table_group)
 712                 return -EFAULT;
 713
 714         if (!(table_group->pgsizes & (1ULL << page_shift)))
 715                 return -EINVAL;
 716
 717         if (!table_group->ops->set_window || !table_group->ops->unset_window ||
 718                         !table_group->ops->get_table_size ||
 719                         !table_group->ops->create_table)
 720                 return -EPERM;
 721
 722         /* Create TCE table */
 723         ret = tce_iommu_create_table(container, table_group, num,
 724                         page_shift, window_size, levels, &tbl);
 725         if (ret)
 726                 return ret;
 727
 728         BUG_ON(!tbl->it_ops->free);
 729
 730         /*
 731          * Program the table to every group.
 732          * Groups have been tested for compatibility at the attach time.
 733          */
 734         list_for_each_entry(tcegrp, &container->group_list, next) {
 735                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 736
 737                 ret = table_group->ops->set_window(table_group, num, tbl);
 738                 if (ret)
 739                         goto unset_exit;
 740         }
 741
 742         container->tables[num] = tbl;
 743
 744         /* Return start address assigned by platform in create_table() */
 745         *start_addr = tbl->it_offset << tbl->it_page_shift;
 746
 747         return 0;
 748
 749 unset_exit:
 750         list_for_each_entry(tcegrp, &container->group_list, next) {
 751                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 752                 table_group->ops->unset_window(table_group, num);
 753         }
 754         tce_iommu_free_table(container, tbl);
 755
 756         return ret;
 757 }
 758
 759 static long tce_iommu_remove_window(struct tce_container *container,
 760                 __u64 start_addr)
 761 {
 762         struct iommu_table_group *table_group = NULL;
 763         struct iommu_table *tbl;
 764         struct tce_iommu_group *tcegrp;
 765         int num;
 766
 767         num = tce_iommu_find_table(container, start_addr, &tbl);
 768         if (num < 0)
 769                 return -EINVAL;
 770
 771         BUG_ON(!tbl->it_size);
 772
 773         /* Detach groups from IOMMUs */
 774         list_for_each_entry(tcegrp, &container->group_list, next) {
 775                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 776
 777                 /*
 778                  * SPAPR TCE IOMMU exposes the default DMA window to
 779                  * the guest via dma32_window_start/size of
 780                  * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow
 781                  * the userspace to remove this window, some do not so
 782                  * here we check for the platform capability.
 783                  */
 784                 if (!table_group->ops || !table_group->ops->unset_window)
 785                         return -EPERM;
 786
 787                 table_group->ops->unset_window(table_group, num);
 788         }
 789
 790         /* Free table */
 791         tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
 792         tce_iommu_free_table(container, tbl);
 793         container->tables[num] = NULL;
 794
 795         return 0;
 796 }
 797
 798 static long tce_iommu_create_default_window(struct tce_container *container)
 799 {
 800         long ret;
 801         __u64 start_addr = 0;
 802         struct tce_iommu_group *tcegrp;
 803         struct iommu_table_group *table_group;
 804
 805         if (!container->def_window_pending)
 806                 return 0;
 807
 808         if (!tce_groups_attached(container))
 809                 return -ENODEV;
 810
 811         tcegrp = list_first_entry(&container->group_list,
 812                         struct tce_iommu_group, next);
 813         table_group = iommu_group_get_iommudata(tcegrp->grp);
 814         if (!table_group)
 815                 return -ENODEV;
 816
 817         ret = tce_iommu_create_window(container, IOMMU_PAGE_SHIFT_4K,
 818                         table_group->tce32_size, 1, &start_addr);
 819         WARN_ON_ONCE(!ret && start_addr);
 820
 821         if (!ret)
 822                 container->def_window_pending = false;
 823
 824         return ret;
 825 }
 826
 827 static long tce_iommu_ioctl(void *iommu_data,
 828                                  unsigned int cmd, unsigned long arg)
 829 {
 830         struct tce_container *container = iommu_data;
 831         unsigned long minsz, ddwsz;
 832         long ret;
 833
 834         switch (cmd) {
 835         case VFIO_CHECK_EXTENSION:
 836                 switch (arg) {
 837                 case VFIO_SPAPR_TCE_IOMMU:
 838                 case VFIO_SPAPR_TCE_v2_IOMMU:
 839                         ret = 1;
 840                         break;
 841                 default:
 842                         ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg);
 843                         break;
 844                 }
 845
 846                 return (ret < 0) ? 0 : ret;
 847         }
 848
 849         /*
 850          * Sanity check to prevent one userspace from manipulating
 851          * another userspace mm.
 852          */
 853         BUG_ON(!container);
 854         if (container->mm && container->mm != current->mm)
 855                 return -EPERM;
 856
 857         switch (cmd) {
 858         case VFIO_IOMMU_SPAPR_TCE_GET_INFO: {
 859                 struct vfio_iommu_spapr_tce_info info;
 860                 struct tce_iommu_group *tcegrp;
 861                 struct iommu_table_group *table_group;
 862
 863                 if (!tce_groups_attached(container))
 864                         return -ENXIO;
 865
 866                 tcegrp = list_first_entry(&container->group_list,
 867                                 struct tce_iommu_group, next);
 868                 table_group = iommu_group_get_iommudata(tcegrp->grp);
 869
 870                 if (!table_group)
 871                         return -ENXIO;
 872
 873                 minsz = offsetofend(struct vfio_iommu_spapr_tce_info,
 874                                 dma32_window_size);
 875
 876                 if (copy_from_user(&info, (void __user *)arg, minsz))
 877                         return -EFAULT;
 878
 879                 if (info.argsz < minsz)
 880                         return -EINVAL;
 881
 882                 info.dma32_window_start = table_group->tce32_start;
 883                 info.dma32_window_size = table_group->tce32_size;
 884                 info.flags = 0;
 885                 memset(&info.ddw, 0, sizeof(info.ddw));
 886
 887                 if (table_group->max_dynamic_windows_supported &&
 888                                 container->v2) {
 889                         info.flags |= VFIO_IOMMU_SPAPR_INFO_DDW;
 890                         info.ddw.pgsizes = table_group->pgsizes;
 891                         info.ddw.max_dynamic_windows_supported =
 892                                 table_group->max_dynamic_windows_supported;
 893                         info.ddw.levels = table_group->max_levels;
 894                 }
 895
 896                 ddwsz = offsetofend(struct vfio_iommu_spapr_tce_info, ddw);
 897
 898                 if (info.argsz >= ddwsz)
 899                         minsz = ddwsz;
 900
 901                 if (copy_to_user((void __user *)arg, &info, minsz))
 902                         return -EFAULT;
 903
 904                 return 0;
 905         }
 906         case VFIO_IOMMU_MAP_DMA: {
 907                 struct vfio_iommu_type1_dma_map param;
 908                 struct iommu_table *tbl = NULL;
 909                 long num;
 910                 enum dma_data_direction direction;
 911
 912                 if (!container->enabled)
 913                         return -EPERM;
 914
 915                 minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
 916
 917                 if (copy_from_user(&param, (void __user *)arg, minsz))
 918                         return -EFAULT;
 919
 920                 if (param.argsz < minsz)
 921                         return -EINVAL;
 922
 923                 if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ |
 924                                 VFIO_DMA_MAP_FLAG_WRITE))
 925                         return -EINVAL;
 926
 927                 ret = tce_iommu_create_default_window(container);
 928                 if (ret)
 929                         return ret;
 930
 931                 num = tce_iommu_find_table(container, param.iova, &tbl);
 932                 if (num < 0)
 933                         return -ENXIO;
 934
 935                 if ((param.size & ~IOMMU_PAGE_MASK(tbl)) ||
 936                                 (param.vaddr & ~IOMMU_PAGE_MASK(tbl)))
 937                         return -EINVAL;
 938
 939                 /* iova is checked by the IOMMU API */
 940                 if (param.flags & VFIO_DMA_MAP_FLAG_READ) {
 941                         if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
 942                                 direction = DMA_BIDIRECTIONAL;
 943                         else
 944                                 direction = DMA_TO_DEVICE;
 945                 } else {
 946                         if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
 947                                 direction = DMA_FROM_DEVICE;
 948                         else
 949                                 return -EINVAL;
 950                 }
 951
 952                 ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr);
 953                 if (ret)
 954                         return ret;
 955
 956                 if (container->v2)
 957                         ret = tce_iommu_build_v2(container, tbl,
 958                                         param.iova >> tbl->it_page_shift,
 959                                         param.vaddr,
 960                                         param.size >> tbl->it_page_shift,
 961                                         direction);
 962                 else
 963                         ret = tce_iommu_build(container, tbl,
 964                                         param.iova >> tbl->it_page_shift,
 965                                         param.vaddr,
 966                                         param.size >> tbl->it_page_shift,
 967                                         direction);
 968
 969                 iommu_flush_tce(tbl);
 970
 971                 return ret;
 972         }
 973         case VFIO_IOMMU_UNMAP_DMA: {
 974                 struct vfio_iommu_type1_dma_unmap param;
 975                 struct iommu_table *tbl = NULL;
 976                 long num;
 977
 978                 if (!container->enabled)
 979                         return -EPERM;
 980
 981                 minsz = offsetofend(struct vfio_iommu_type1_dma_unmap,
 982                                 size);
 983
 984                 if (copy_from_user(&param, (void __user *)arg, minsz))
 985                         return -EFAULT;
 986
 987                 if (param.argsz < minsz)
 988                         return -EINVAL;
 989
 990                 /* No flag is supported now */
 991                 if (param.flags)
 992                         return -EINVAL;
 993
 994                 ret = tce_iommu_create_default_window(container);
 995                 if (ret)
 996                         return ret;
 997
 998                 num = tce_iommu_find_table(container, param.iova, &tbl);
 999                 if (num < 0)
1000                         return -ENXIO;
1001
1002                 if (param.size & ~IOMMU_PAGE_MASK(tbl))
1003                         return -EINVAL;
1004
1005                 ret = iommu_tce_clear_param_check(tbl, param.iova, 0,
1006                                 param.size >> tbl->it_page_shift);
1007                 if (ret)
1008                         return ret;
1009
1010                 ret = tce_iommu_clear(container, tbl,
1011                                 param.iova >> tbl->it_page_shift,
1012                                 param.size >> tbl->it_page_shift);
1013                 iommu_flush_tce(tbl);
1014
1015                 return ret;
1016         }
1017         case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: {
1018                 struct vfio_iommu_spapr_register_memory param;
1019
1020                 if (!container->v2)
1021                         break;
1022
1023                 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
1024                                 size);
1025
1026                 ret = tce_iommu_mm_set(container);
1027                 if (ret)
1028                         return ret;
1029
1030                 if (copy_from_user(&param, (void __user *)arg, minsz))
1031                         return -EFAULT;
1032
1033                 if (param.argsz < minsz)
1034                         return -EINVAL;
1035
1036                 /* No flag is supported now */
1037                 if (param.flags)
1038                         return -EINVAL;
1039
1040                 mutex_lock(&container->lock);
1041                 ret = tce_iommu_register_pages(container, param.vaddr,
1042                                 param.size);
1043                 mutex_unlock(&container->lock);
1044
1045                 return ret;
1046         }
1047         case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: {
1048                 struct vfio_iommu_spapr_register_memory param;
1049
1050                 if (!container->v2)
1051                         break;
1052
1053                 if (!container->mm)
1054                         return -EPERM;
1055
1056                 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
1057                                 size);
1058
1059                 if (copy_from_user(&param, (void __user *)arg, minsz))
1060                         return -EFAULT;
1061
1062                 if (param.argsz < minsz)
1063                         return -EINVAL;
1064
1065                 /* No flag is supported now */
1066                 if (param.flags)
1067                         return -EINVAL;
1068
1069                 mutex_lock(&container->lock);
1070                 ret = tce_iommu_unregister_pages(container, param.vaddr,
1071                                 param.size);
1072                 mutex_unlock(&container->lock);
1073
1074                 return ret;
1075         }
1076         case VFIO_IOMMU_ENABLE:
1077                 if (container->v2)
1078                         break;
1079
1080                 mutex_lock(&container->lock);
1081                 ret = tce_iommu_enable(container);
1082                 mutex_unlock(&container->lock);
1083                 return ret;
1084
1085
1086         case VFIO_IOMMU_DISABLE:
1087                 if (container->v2)
1088                         break;
1089
1090                 mutex_lock(&container->lock);
1091                 tce_iommu_disable(container);
1092                 mutex_unlock(&container->lock);
1093                 return 0;
1094
1095         case VFIO_EEH_PE_OP: {
1096                 struct tce_iommu_group *tcegrp;
1097
1098                 ret = 0;
1099                 list_for_each_entry(tcegrp, &container->group_list, next) {
1100                         ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp,
1101                                         cmd, arg);
1102                         if (ret)
1103                                 return ret;
1104                 }
1105                 return ret;
1106         }
1107
1108         case VFIO_IOMMU_SPAPR_TCE_CREATE: {
1109                 struct vfio_iommu_spapr_tce_create create;
1110
1111                 if (!container->v2)
1112                         break;
1113
1114                 ret = tce_iommu_mm_set(container);
1115                 if (ret)
1116                         return ret;
1117
1118                 if (!tce_groups_attached(container))
1119                         return -ENXIO;
1120
1121                 minsz = offsetofend(struct vfio_iommu_spapr_tce_create,
1122                                 start_addr);
1123
1124                 if (copy_from_user(&create, (void __user *)arg, minsz))
1125                         return -EFAULT;
1126
1127                 if (create.argsz < minsz)
1128                         return -EINVAL;
1129
1130                 if (create.flags)
1131                         return -EINVAL;
1132
1133                 mutex_lock(&container->lock);
1134
1135                 ret = tce_iommu_create_default_window(container);
1136                 if (!ret)
1137                         ret = tce_iommu_create_window(container,
1138                                         create.page_shift,
1139                                         create.window_size, create.levels,
1140                                         &create.start_addr);
1141
1142                 mutex_unlock(&container->lock);
1143
1144                 if (!ret && copy_to_user((void __user *)arg, &create, minsz))
1145                         ret = -EFAULT;
1146
1147                 return ret;
1148         }
1149         case VFIO_IOMMU_SPAPR_TCE_REMOVE: {
1150                 struct vfio_iommu_spapr_tce_remove remove;
1151
1152                 if (!container->v2)
1153                         break;
1154
1155                 ret = tce_iommu_mm_set(container);
1156                 if (ret)
1157                         return ret;
1158
1159                 if (!tce_groups_attached(container))
1160                         return -ENXIO;
1161
1162                 minsz = offsetofend(struct vfio_iommu_spapr_tce_remove,
1163                                 start_addr);
1164
1165                 if (copy_from_user(&remove, (void __user *)arg, minsz))
1166                         return -EFAULT;
1167
1168                 if (remove.argsz < minsz)
1169                         return -EINVAL;
1170
1171                 if (remove.flags)
1172                         return -EINVAL;
1173
1174                 if (container->def_window_pending && !remove.start_addr) {
1175                         container->def_window_pending = false;
1176                         return 0;
1177                 }
1178
1179                 mutex_lock(&container->lock);
1180
1181                 ret = tce_iommu_remove_window(container, remove.start_addr);
1182
1183                 mutex_unlock(&container->lock);
1184
1185                 return ret;
1186         }
1187         }
1188
1189         return -ENOTTY;
1190 }
1191
1192 static void tce_iommu_release_ownership(struct tce_container *container,
1193                 struct iommu_table_group *table_group)
1194 {
1195         int i;
1196
1197         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1198                 struct iommu_table *tbl = container->tables[i];
1199
1200                 if (!tbl)
1201                         continue;
1202
1203                 tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
1204                 tce_iommu_userspace_view_free(tbl, container->mm);
1205                 if (tbl->it_map)
1206                         iommu_release_ownership(tbl);
1207
1208                 container->tables[i] = NULL;
1209         }
1210 }
1211
1212 static int tce_iommu_take_ownership(struct tce_container *container,
1213                 struct iommu_table_group *table_group)
1214 {
1215         int i, j, rc = 0;
1216
1217         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1218                 struct iommu_table *tbl = table_group->tables[i];
1219
1220                 if (!tbl || !tbl->it_map)
1221                         continue;
1222
1223                 rc = iommu_take_ownership(tbl);
1224                 if (rc) {
1225                         for (j = 0; j < i; ++j)
1226                                 iommu_release_ownership(
1227                                                 table_group->tables[j]);
1228
1229                         return rc;
1230                 }
1231         }
1232
1233         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1234                 container->tables[i] = table_group->tables[i];
1235
1236         return 0;
1237 }
1238
1239 static void tce_iommu_release_ownership_ddw(struct tce_container *container,
1240                 struct iommu_table_group *table_group)
1241 {
1242         long i;
1243
1244         if (!table_group->ops->unset_window) {
1245                 WARN_ON_ONCE(1);
1246                 return;
1247         }
1248
1249         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1250                 table_group->ops->unset_window(table_group, i);
1251
1252         table_group->ops->release_ownership(table_group);
1253 }
1254
1255 static long tce_iommu_take_ownership_ddw(struct tce_container *container,
1256                 struct iommu_table_group *table_group)
1257 {
1258         long i, ret = 0;
1259
1260         if (!table_group->ops->create_table || !table_group->ops->set_window ||
1261                         !table_group->ops->release_ownership) {
1262                 WARN_ON_ONCE(1);
1263                 return -EFAULT;
1264         }
1265
1266         table_group->ops->take_ownership(table_group);
1267
1268         /* Set all windows to the new group */
1269         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1270                 struct iommu_table *tbl = container->tables[i];
1271
1272                 if (!tbl)
1273                         continue;
1274
1275                 ret = table_group->ops->set_window(table_group, i, tbl);
1276                 if (ret)
1277                         goto release_exit;
1278         }
1279
1280         return 0;
1281
1282 release_exit:
1283         for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1284                 table_group->ops->unset_window(table_group, i);
1285
1286         table_group->ops->release_ownership(table_group);
1287
1288         return ret;
1289 }
1290
1291 static int tce_iommu_attach_group(void *iommu_data,
1292                 struct iommu_group *iommu_group)
1293 {
1294         int ret;
1295         struct tce_container *container = iommu_data;
1296         struct iommu_table_group *table_group;
1297         struct tce_iommu_group *tcegrp = NULL;
1298
1299         mutex_lock(&container->lock);
1300
1301         /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
1302                         iommu_group_id(iommu_group), iommu_group); */
1303         table_group = iommu_group_get_iommudata(iommu_group);
1304         if (!table_group) {
1305                 ret = -ENODEV;
1306                 goto unlock_exit;
1307         }
1308
1309         if (tce_groups_attached(container) && (!table_group->ops ||
1310                         !table_group->ops->take_ownership ||
1311                         !table_group->ops->release_ownership)) {
1312                 ret = -EBUSY;
1313                 goto unlock_exit;
1314         }
1315
1316         /* Check if new group has the same iommu_ops (i.e. compatible) */
1317         list_for_each_entry(tcegrp, &container->group_list, next) {
1318                 struct iommu_table_group *table_group_tmp;
1319
1320                 if (tcegrp->grp == iommu_group) {
1321                         pr_warn("tce_vfio: Group %d is already attached\n",
1322                                         iommu_group_id(iommu_group));
1323                         ret = -EBUSY;
1324                         goto unlock_exit;
1325                 }
1326                 table_group_tmp = iommu_group_get_iommudata(tcegrp->grp);
1327                 if (table_group_tmp->ops->create_table !=
1328                                 table_group->ops->create_table) {
1329                         pr_warn("tce_vfio: Group %d is incompatible with group %d\n",
1330                                         iommu_group_id(iommu_group),
1331                                         iommu_group_id(tcegrp->grp));
1332                         ret = -EPERM;
1333                         goto unlock_exit;
1334                 }
1335         }
1336
1337         tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL);
1338         if (!tcegrp) {
1339                 ret = -ENOMEM;
1340                 goto unlock_exit;
1341         }
1342
1343         if (!table_group->ops || !table_group->ops->take_ownership ||
1344                         !table_group->ops->release_ownership) {
1345                 if (container->v2) {
1346                         ret = -EPERM;
1347                         goto unlock_exit;
1348                 }
1349                 ret = tce_iommu_take_ownership(container, table_group);
1350         } else {
1351                 if (!container->v2) {
1352                         ret = -EPERM;
1353                         goto unlock_exit;
1354                 }
1355                 ret = tce_iommu_take_ownership_ddw(container, table_group);
1356                 if (!tce_groups_attached(container) && !container->tables[0])
1357                         container->def_window_pending = true;
1358         }
1359
1360         if (!ret) {
1361                 tcegrp->grp = iommu_group;
1362                 list_add(&tcegrp->next, &container->group_list);
1363         }
1364
1365 unlock_exit:
1366         if (ret && tcegrp)
1367                 kfree(tcegrp);
1368
1369         mutex_unlock(&container->lock);
1370
1371         return ret;
1372 }
1373
1374 static void tce_iommu_detach_group(void *iommu_data,
1375                 struct iommu_group *iommu_group)
1376 {
1377         struct tce_container *container = iommu_data;
1378         struct iommu_table_group *table_group;
1379         bool found = false;
1380         struct tce_iommu_group *tcegrp;
1381
1382         mutex_lock(&container->lock);
1383
1384         list_for_each_entry(tcegrp, &container->group_list, next) {
1385                 if (tcegrp->grp == iommu_group) {
1386                         found = true;
1387                         break;
1388                 }
1389         }
1390
1391         if (!found) {
1392                 pr_warn("tce_vfio: detaching unattached group #%u\n",
1393                                 iommu_group_id(iommu_group));
1394                 goto unlock_exit;
1395         }
1396
1397         list_del(&tcegrp->next);
1398         kfree(tcegrp);
1399
1400         table_group = iommu_group_get_iommudata(iommu_group);
1401         BUG_ON(!table_group);
1402
1403         if (!table_group->ops || !table_group->ops->release_ownership)
1404                 tce_iommu_release_ownership(container, table_group);
1405         else
1406                 tce_iommu_release_ownership_ddw(container, table_group);
1407
1408 unlock_exit:
1409         mutex_unlock(&container->lock);
1410 }
1411
1412 const struct vfio_iommu_driver_ops tce_iommu_driver_ops = {
1413         .name           = "iommu-vfio-powerpc",
1414         .owner          = THIS_MODULE,
1415         .open           = tce_iommu_open,
1416         .release        = tce_iommu_release,
1417         .ioctl          = tce_iommu_ioctl,
1418         .attach_group   = tce_iommu_attach_group,
1419         .detach_group   = tce_iommu_detach_group,
1420 };
1421
1422 static int __init tce_iommu_init(void)
1423 {
1424         return vfio_register_iommu_driver(&tce_iommu_driver_ops);
1425 }
1426
1427 static void __exit tce_iommu_cleanup(void)
1428 {
1429         vfio_unregister_iommu_driver(&tce_iommu_driver_ops);
1430 }
1431
1432 module_init(tce_iommu_init);
1433 module_exit(tce_iommu_cleanup);
1434
1435 MODULE_VERSION(DRIVER_VERSION);
1436 MODULE_LICENSE("GPL v2");
1437 MODULE_AUTHOR(DRIVER_AUTHOR);
1438 MODULE_DESCRIPTION(DRIVER_DESC);
1439