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