drivers/gpu/drm/tegra/drm.c

   1 /*
   2  * Copyright (C) 2012 Avionic Design GmbH
   3  * Copyright (C) 2012-2016 NVIDIA CORPORATION.  All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #include <linux/bitops.h>
  11 #include <linux/host1x.h>
  12 #include <linux/idr.h>
  13 #include <linux/iommu.h>
  14
  15 #include <drm/drm_atomic.h>
  16 #include <drm/drm_atomic_helper.h>
  17
  18 #include "drm.h"
  19 #include "gem.h"
  20
  21 #define DRIVER_NAME "tegra"
  22 #define DRIVER_DESC "NVIDIA Tegra graphics"
  23 #define DRIVER_DATE "20120330"
  24 #define DRIVER_MAJOR 0
  25 #define DRIVER_MINOR 0
  26 #define DRIVER_PATCHLEVEL 0
  27
  28 #define CARVEOUT_SZ SZ_64M
  29 #define CDMA_GATHER_FETCHES_MAX_NB 16383
  30
  31 struct tegra_drm_file {
  32         struct idr contexts;
  33         struct mutex lock;
  34 };
  35
  36 static void tegra_atomic_schedule(struct tegra_drm *tegra,
  37                                   struct drm_atomic_state *state)
  38 {
  39         tegra->commit.state = state;
  40         schedule_work(&tegra->commit.work);
  41 }
  42
  43 static void tegra_atomic_complete(struct tegra_drm *tegra,
  44                                   struct drm_atomic_state *state)
  45 {
  46         struct drm_device *drm = tegra->drm;
  47
  48         /*
  49          * Everything below can be run asynchronously without the need to grab
  50          * any modeset locks at all under one condition: It must be guaranteed
  51          * that the asynchronous work has either been cancelled (if the driver
  52          * supports it, which at least requires that the framebuffers get
  53          * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
  54          * before the new state gets committed on the software side with
  55          * drm_atomic_helper_swap_state().
  56          *
  57          * This scheme allows new atomic state updates to be prepared and
  58          * checked in parallel to the asynchronous completion of the previous
  59          * update. Which is important since compositors need to figure out the
  60          * composition of the next frame right after having submitted the
  61          * current layout.
  62          */
  63
  64         drm_atomic_helper_commit_modeset_disables(drm, state);
  65         drm_atomic_helper_commit_modeset_enables(drm, state);
  66         drm_atomic_helper_commit_planes(drm, state,
  67                                         DRM_PLANE_COMMIT_ACTIVE_ONLY);
  68
  69         drm_atomic_helper_wait_for_vblanks(drm, state);
  70
  71         drm_atomic_helper_cleanup_planes(drm, state);
  72         drm_atomic_state_put(state);
  73 }
  74
  75 static void tegra_atomic_work(struct work_struct *work)
  76 {
  77         struct tegra_drm *tegra = container_of(work, struct tegra_drm,
  78                                                commit.work);
  79
  80         tegra_atomic_complete(tegra, tegra->commit.state);
  81 }
  82
  83 static int tegra_atomic_commit(struct drm_device *drm,
  84                                struct drm_atomic_state *state, bool nonblock)
  85 {
  86         struct tegra_drm *tegra = drm->dev_private;
  87         int err;
  88
  89         err = drm_atomic_helper_prepare_planes(drm, state);
  90         if (err)
  91                 return err;
  92
  93         /* serialize outstanding nonblocking commits */
  94         mutex_lock(&tegra->commit.lock);
  95         flush_work(&tegra->commit.work);
  96
  97         /*
  98          * This is the point of no return - everything below never fails except
  99          * when the hw goes bonghits. Which means we can commit the new state on
 100          * the software side now.
 101          */
 102
 103         err = drm_atomic_helper_swap_state(state, true);
 104         if (err) {
 105                 mutex_unlock(&tegra->commit.lock);
 106                 drm_atomic_helper_cleanup_planes(drm, state);
 107                 return err;
 108         }
 109
 110         drm_atomic_state_get(state);
 111         if (nonblock)
 112                 tegra_atomic_schedule(tegra, state);
 113         else
 114                 tegra_atomic_complete(tegra, state);
 115
 116         mutex_unlock(&tegra->commit.lock);
 117         return 0;
 118 }
 119
 120 static const struct drm_mode_config_funcs tegra_drm_mode_funcs = {
 121         .fb_create = tegra_fb_create,
 122 #ifdef CONFIG_DRM_FBDEV_EMULATION
 123         .output_poll_changed = tegra_fb_output_poll_changed,
 124 #endif
 125         .atomic_check = drm_atomic_helper_check,
 126         .atomic_commit = tegra_atomic_commit,
 127 };
 128
 129 static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
 130 {
 131         struct host1x_device *device = to_host1x_device(drm->dev);
 132         struct tegra_drm *tegra;
 133         int err;
 134
 135         tegra = kzalloc(sizeof(*tegra), GFP_KERNEL);
 136         if (!tegra)
 137                 return -ENOMEM;
 138
 139         if (iommu_present(&platform_bus_type)) {
 140                 u64 carveout_start, carveout_end, gem_start, gem_end;
 141                 struct iommu_domain_geometry *geometry;
 142                 unsigned long order;
 143
 144                 tegra->domain = iommu_domain_alloc(&platform_bus_type);
 145                 if (!tegra->domain) {
 146                         err = -ENOMEM;
 147                         goto free;
 148                 }
 149
 150                 geometry = &tegra->domain->geometry;
 151                 gem_start = geometry->aperture_start;
 152                 gem_end = geometry->aperture_end - CARVEOUT_SZ;
 153                 carveout_start = gem_end + 1;
 154                 carveout_end = geometry->aperture_end;
 155
 156                 order = __ffs(tegra->domain->pgsize_bitmap);
 157                 init_iova_domain(&tegra->carveout.domain, 1UL << order,
 158                                  carveout_start >> order,
 159                                  carveout_end >> order);
 160
 161                 tegra->carveout.shift = iova_shift(&tegra->carveout.domain);
 162                 tegra->carveout.limit = carveout_end >> tegra->carveout.shift;
 163
 164                 drm_mm_init(&tegra->mm, gem_start, gem_end - gem_start + 1);
 165                 mutex_init(&tegra->mm_lock);
 166
 167                 DRM_DEBUG("IOMMU apertures:\n");
 168                 DRM_DEBUG("  GEM: %#llx-%#llx\n", gem_start, gem_end);
 169                 DRM_DEBUG("  Carveout: %#llx-%#llx\n", carveout_start,
 170                           carveout_end);
 171         }
 172
 173         mutex_init(&tegra->clients_lock);
 174         INIT_LIST_HEAD(&tegra->clients);
 175
 176         mutex_init(&tegra->commit.lock);
 177         INIT_WORK(&tegra->commit.work, tegra_atomic_work);
 178
 179         drm->dev_private = tegra;
 180         tegra->drm = drm;
 181
 182         drm_mode_config_init(drm);
 183
 184         drm->mode_config.min_width = 0;
 185         drm->mode_config.min_height = 0;
 186
 187         drm->mode_config.max_width = 4096;
 188         drm->mode_config.max_height = 4096;
 189
 190         drm->mode_config.allow_fb_modifiers = true;
 191
 192         drm->mode_config.funcs = &tegra_drm_mode_funcs;
 193
 194         err = tegra_drm_fb_prepare(drm);
 195         if (err < 0)
 196                 goto config;
 197
 198         drm_kms_helper_poll_init(drm);
 199
 200         err = host1x_device_init(device);
 201         if (err < 0)
 202                 goto fbdev;
 203
 204         /*
 205          * We don't use the drm_irq_install() helpers provided by the DRM
 206          * core, so we need to set this manually in order to allow the
 207          * DRM_IOCTL_WAIT_VBLANK to operate correctly.
 208          */
 209         drm->irq_enabled = true;
 210
 211         /* syncpoints are used for full 32-bit hardware VBLANK counters */
 212         drm->max_vblank_count = 0xffffffff;
 213
 214         err = drm_vblank_init(drm, drm->mode_config.num_crtc);
 215         if (err < 0)
 216                 goto device;
 217
 218         drm_mode_config_reset(drm);
 219
 220         err = tegra_drm_fb_init(drm);
 221         if (err < 0)
 222                 goto device;
 223
 224         return 0;
 225
 226 device:
 227         host1x_device_exit(device);
 228 fbdev:
 229         drm_kms_helper_poll_fini(drm);
 230         tegra_drm_fb_free(drm);
 231 config:
 232         drm_mode_config_cleanup(drm);
 233
 234         if (tegra->domain) {
 235                 iommu_domain_free(tegra->domain);
 236                 drm_mm_takedown(&tegra->mm);
 237                 mutex_destroy(&tegra->mm_lock);
 238                 put_iova_domain(&tegra->carveout.domain);
 239         }
 240 free:
 241         kfree(tegra);
 242         return err;
 243 }
 244
 245 static void tegra_drm_unload(struct drm_device *drm)
 246 {
 247         struct host1x_device *device = to_host1x_device(drm->dev);
 248         struct tegra_drm *tegra = drm->dev_private;
 249         int err;
 250
 251         drm_kms_helper_poll_fini(drm);
 252         tegra_drm_fb_exit(drm);
 253         drm_mode_config_cleanup(drm);
 254
 255         err = host1x_device_exit(device);
 256         if (err < 0)
 257                 return;
 258
 259         if (tegra->domain) {
 260                 iommu_domain_free(tegra->domain);
 261                 drm_mm_takedown(&tegra->mm);
 262                 mutex_destroy(&tegra->mm_lock);
 263                 put_iova_domain(&tegra->carveout.domain);
 264         }
 265
 266         kfree(tegra);
 267 }
 268
 269 static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
 270 {
 271         struct tegra_drm_file *fpriv;
 272
 273         fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL);
 274         if (!fpriv)
 275                 return -ENOMEM;
 276
 277         idr_init(&fpriv->contexts);
 278         mutex_init(&fpriv->lock);
 279         filp->driver_priv = fpriv;
 280
 281         return 0;
 282 }
 283
 284 static void tegra_drm_context_free(struct tegra_drm_context *context)
 285 {
 286         context->client->ops->close_channel(context);
 287         kfree(context);
 288 }
 289
 290 static void tegra_drm_lastclose(struct drm_device *drm)
 291 {
 292 #ifdef CONFIG_DRM_FBDEV_EMULATION
 293         struct tegra_drm *tegra = drm->dev_private;
 294
 295         tegra_fbdev_restore_mode(tegra->fbdev);
 296 #endif
 297 }
 298
 299 static struct host1x_bo *
 300 host1x_bo_lookup(struct drm_file *file, u32 handle)
 301 {
 302         struct drm_gem_object *gem;
 303         struct tegra_bo *bo;
 304
 305         gem = drm_gem_object_lookup(file, handle);
 306         if (!gem)
 307                 return NULL;
 308
 309         bo = to_tegra_bo(gem);
 310         return &bo->base;
 311 }
 312
 313 static int host1x_reloc_copy_from_user(struct host1x_reloc *dest,
 314                                        struct drm_tegra_reloc __user *src,
 315                                        struct drm_device *drm,
 316                                        struct drm_file *file)
 317 {
 318         u32 cmdbuf, target;
 319         int err;
 320
 321         err = get_user(cmdbuf, &src->cmdbuf.handle);
 322         if (err < 0)
 323                 return err;
 324
 325         err = get_user(dest->cmdbuf.offset, &src->cmdbuf.offset);
 326         if (err < 0)
 327                 return err;
 328
 329         err = get_user(target, &src->target.handle);
 330         if (err < 0)
 331                 return err;
 332
 333         err = get_user(dest->target.offset, &src->target.offset);
 334         if (err < 0)
 335                 return err;
 336
 337         err = get_user(dest->shift, &src->shift);
 338         if (err < 0)
 339                 return err;
 340
 341         dest->cmdbuf.bo = host1x_bo_lookup(file, cmdbuf);
 342         if (!dest->cmdbuf.bo)
 343                 return -ENOENT;
 344
 345         dest->target.bo = host1x_bo_lookup(file, target);
 346         if (!dest->target.bo)
 347                 return -ENOENT;
 348
 349         return 0;
 350 }
 351
 352 static int host1x_waitchk_copy_from_user(struct host1x_waitchk *dest,
 353                                          struct drm_tegra_waitchk __user *src,
 354                                          struct drm_file *file)
 355 {
 356         u32 cmdbuf;
 357         int err;
 358
 359         err = get_user(cmdbuf, &src->handle);
 360         if (err < 0)
 361                 return err;
 362
 363         err = get_user(dest->offset, &src->offset);
 364         if (err < 0)
 365                 return err;
 366
 367         err = get_user(dest->syncpt_id, &src->syncpt);
 368         if (err < 0)
 369                 return err;
 370
 371         err = get_user(dest->thresh, &src->thresh);
 372         if (err < 0)
 373                 return err;
 374
 375         dest->bo = host1x_bo_lookup(file, cmdbuf);
 376         if (!dest->bo)
 377                 return -ENOENT;
 378
 379         return 0;
 380 }
 381
 382 int tegra_drm_submit(struct tegra_drm_context *context,
 383                      struct drm_tegra_submit *args, struct drm_device *drm,
 384                      struct drm_file *file)
 385 {
 386         unsigned int num_cmdbufs = args->num_cmdbufs;
 387         unsigned int num_relocs = args->num_relocs;
 388         unsigned int num_waitchks = args->num_waitchks;
 389         struct drm_tegra_cmdbuf __user *cmdbufs =
 390                 (void __user *)(uintptr_t)args->cmdbufs;
 391         struct drm_tegra_reloc __user *relocs =
 392                 (void __user *)(uintptr_t)args->relocs;
 393         struct drm_tegra_waitchk __user *waitchks =
 394                 (void __user *)(uintptr_t)args->waitchks;
 395         struct drm_tegra_syncpt syncpt;
 396         struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
 397         struct drm_gem_object **refs;
 398         struct host1x_syncpt *sp;
 399         struct host1x_job *job;
 400         unsigned int num_refs;
 401         int err;
 402
 403         /* We don't yet support other than one syncpt_incr struct per submit */
 404         if (args->num_syncpts != 1)
 405                 return -EINVAL;
 406
 407         /* We don't yet support waitchks */
 408         if (args->num_waitchks != 0)
 409                 return -EINVAL;
 410
 411         job = host1x_job_alloc(context->channel, args->num_cmdbufs,
 412                                args->num_relocs, args->num_waitchks);
 413         if (!job)
 414                 return -ENOMEM;
 415
 416         job->num_relocs = args->num_relocs;
 417         job->num_waitchk = args->num_waitchks;
 418         job->client = (u32)args->context;
 419         job->class = context->client->base.class;
 420         job->serialize = true;
 421
 422         /*
 423          * Track referenced BOs so that they can be unreferenced after the
 424          * submission is complete.
 425          */
 426         num_refs = num_cmdbufs + num_relocs * 2 + num_waitchks;
 427
 428         refs = kmalloc_array(num_refs, sizeof(*refs), GFP_KERNEL);
 429         if (!refs) {
 430                 err = -ENOMEM;
 431                 goto put;
 432         }
 433
 434         /* reuse as an iterator later */
 435         num_refs = 0;
 436
 437         while (num_cmdbufs) {
 438                 struct drm_tegra_cmdbuf cmdbuf;
 439                 struct host1x_bo *bo;
 440                 struct tegra_bo *obj;
 441                 u64 offset;
 442
 443                 if (copy_from_user(&cmdbuf, cmdbufs, sizeof(cmdbuf))) {
 444                         err = -EFAULT;
 445                         goto fail;
 446                 }
 447
 448                 /*
 449                  * The maximum number of CDMA gather fetches is 16383, a higher
 450                  * value means the words count is malformed.
 451                  */
 452                 if (cmdbuf.words > CDMA_GATHER_FETCHES_MAX_NB) {
 453                         err = -EINVAL;
 454                         goto fail;
 455                 }
 456
 457                 bo = host1x_bo_lookup(file, cmdbuf.handle);
 458                 if (!bo) {
 459                         err = -ENOENT;
 460                         goto fail;
 461                 }
 462
 463                 offset = (u64)cmdbuf.offset + (u64)cmdbuf.words * sizeof(u32);
 464                 obj = host1x_to_tegra_bo(bo);
 465                 refs[num_refs++] = &obj->gem;
 466
 467                 /*
 468                  * Gather buffer base address must be 4-bytes aligned,
 469                  * unaligned offset is malformed and cause commands stream
 470                  * corruption on the buffer address relocation.
 471                  */
 472                 if (offset & 3 || offset >= obj->gem.size) {
 473                         err = -EINVAL;
 474                         goto fail;
 475                 }
 476
 477                 host1x_job_add_gather(job, bo, cmdbuf.words, cmdbuf.offset);
 478                 num_cmdbufs--;
 479                 cmdbufs++;
 480         }
 481
 482         /* copy and resolve relocations from submit */
 483         while (num_relocs--) {
 484                 struct host1x_reloc *reloc;
 485                 struct tegra_bo *obj;
 486
 487                 err = host1x_reloc_copy_from_user(&job->relocarray[num_relocs],
 488                                                   &relocs[num_relocs], drm,
 489                                                   file);
 490                 if (err < 0)
 491                         goto fail;
 492
 493                 reloc = &job->relocarray[num_relocs];
 494                 obj = host1x_to_tegra_bo(reloc->cmdbuf.bo);
 495                 refs[num_refs++] = &obj->gem;
 496
 497                 /*
 498                  * The unaligned cmdbuf offset will cause an unaligned write
 499                  * during of the relocations patching, corrupting the commands
 500                  * stream.
 501                  */
 502                 if (reloc->cmdbuf.offset & 3 ||
 503                     reloc->cmdbuf.offset >= obj->gem.size) {
 504                         err = -EINVAL;
 505                         goto fail;
 506                 }
 507
 508                 obj = host1x_to_tegra_bo(reloc->target.bo);
 509                 refs[num_refs++] = &obj->gem;
 510
 511                 if (reloc->target.offset >= obj->gem.size) {
 512                         err = -EINVAL;
 513                         goto fail;
 514                 }
 515         }
 516
 517         /* copy and resolve waitchks from submit */
 518         while (num_waitchks--) {
 519                 struct host1x_waitchk *wait = &job->waitchk[num_waitchks];
 520                 struct tegra_bo *obj;
 521
 522                 err = host1x_waitchk_copy_from_user(wait,
 523                                                     &waitchks[num_waitchks],
 524                                                     file);
 525                 if (err < 0)
 526                         goto fail;
 527
 528                 obj = host1x_to_tegra_bo(wait->bo);
 529                 refs[num_refs++] = &obj->gem;
 530
 531                 /*
 532                  * The unaligned offset will cause an unaligned write during
 533                  * of the waitchks patching, corrupting the commands stream.
 534                  */
 535                 if (wait->offset & 3 ||
 536                     wait->offset >= obj->gem.size) {
 537                         err = -EINVAL;
 538                         goto fail;
 539                 }
 540         }
 541
 542         if (copy_from_user(&syncpt, (void __user *)(uintptr_t)args->syncpts,
 543                            sizeof(syncpt))) {
 544                 err = -EFAULT;
 545                 goto fail;
 546         }
 547
 548         /* check whether syncpoint ID is valid */
 549         sp = host1x_syncpt_get(host1x, syncpt.id);
 550         if (!sp) {
 551                 err = -ENOENT;
 552                 goto fail;
 553         }
 554
 555         job->is_addr_reg = context->client->ops->is_addr_reg;
 556         job->is_valid_class = context->client->ops->is_valid_class;
 557         job->syncpt_incrs = syncpt.incrs;
 558         job->syncpt_id = syncpt.id;
 559         job->timeout = 10000;
 560
 561         if (args->timeout && args->timeout < 10000)
 562                 job->timeout = args->timeout;
 563
 564         err = host1x_job_pin(job, context->client->base.dev);
 565         if (err)
 566                 goto fail;
 567
 568         err = host1x_job_submit(job);
 569         if (err) {
 570                 host1x_job_unpin(job);
 571                 goto fail;
 572         }
 573
 574         args->fence = job->syncpt_end;
 575
 576 fail:
 577         while (num_refs--)
 578                 drm_gem_object_put_unlocked(refs[num_refs]);
 579
 580         kfree(refs);
 581
 582 put:
 583         host1x_job_put(job);
 584         return err;
 585 }
 586
 587
 588 #ifdef CONFIG_DRM_TEGRA_STAGING
 589 static int tegra_gem_create(struct drm_device *drm, void *data,
 590                             struct drm_file *file)
 591 {
 592         struct drm_tegra_gem_create *args = data;
 593         struct tegra_bo *bo;
 594
 595         bo = tegra_bo_create_with_handle(file, drm, args->size, args->flags,
 596                                          &args->handle);
 597         if (IS_ERR(bo))
 598                 return PTR_ERR(bo);
 599
 600         return 0;
 601 }
 602
 603 static int tegra_gem_mmap(struct drm_device *drm, void *data,
 604                           struct drm_file *file)
 605 {
 606         struct drm_tegra_gem_mmap *args = data;
 607         struct drm_gem_object *gem;
 608         struct tegra_bo *bo;
 609
 610         gem = drm_gem_object_lookup(file, args->handle);
 611         if (!gem)
 612                 return -EINVAL;
 613
 614         bo = to_tegra_bo(gem);
 615
 616         args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
 617
 618         drm_gem_object_put_unlocked(gem);
 619
 620         return 0;
 621 }
 622
 623 static int tegra_syncpt_read(struct drm_device *drm, void *data,
 624                              struct drm_file *file)
 625 {
 626         struct host1x *host = dev_get_drvdata(drm->dev->parent);
 627         struct drm_tegra_syncpt_read *args = data;
 628         struct host1x_syncpt *sp;
 629
 630         sp = host1x_syncpt_get(host, args->id);
 631         if (!sp)
 632                 return -EINVAL;
 633
 634         args->value = host1x_syncpt_read_min(sp);
 635         return 0;
 636 }
 637
 638 static int tegra_syncpt_incr(struct drm_device *drm, void *data,
 639                              struct drm_file *file)
 640 {
 641         struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
 642         struct drm_tegra_syncpt_incr *args = data;
 643         struct host1x_syncpt *sp;
 644
 645         sp = host1x_syncpt_get(host1x, args->id);
 646         if (!sp)
 647                 return -EINVAL;
 648
 649         return host1x_syncpt_incr(sp);
 650 }
 651
 652 static int tegra_syncpt_wait(struct drm_device *drm, void *data,
 653                              struct drm_file *file)
 654 {
 655         struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
 656         struct drm_tegra_syncpt_wait *args = data;
 657         struct host1x_syncpt *sp;
 658
 659         sp = host1x_syncpt_get(host1x, args->id);
 660         if (!sp)
 661                 return -EINVAL;
 662
 663         return host1x_syncpt_wait(sp, args->thresh, args->timeout,
 664                                   &args->value);
 665 }
 666
 667 static int tegra_client_open(struct tegra_drm_file *fpriv,
 668                              struct tegra_drm_client *client,
 669                              struct tegra_drm_context *context)
 670 {
 671         int err;
 672
 673         err = client->ops->open_channel(client, context);
 674         if (err < 0)
 675                 return err;
 676
 677         err = idr_alloc(&fpriv->contexts, context, 1, 0, GFP_KERNEL);
 678         if (err < 0) {
 679                 client->ops->close_channel(context);
 680                 return err;
 681         }
 682
 683         context->client = client;
 684         context->id = err;
 685
 686         return 0;
 687 }
 688
 689 static int tegra_open_channel(struct drm_device *drm, void *data,
 690                               struct drm_file *file)
 691 {
 692         struct tegra_drm_file *fpriv = file->driver_priv;
 693         struct tegra_drm *tegra = drm->dev_private;
 694         struct drm_tegra_open_channel *args = data;
 695         struct tegra_drm_context *context;
 696         struct tegra_drm_client *client;
 697         int err = -ENODEV;
 698
 699         context = kzalloc(sizeof(*context), GFP_KERNEL);
 700         if (!context)
 701                 return -ENOMEM;
 702
 703         mutex_lock(&fpriv->lock);
 704
 705         list_for_each_entry(client, &tegra->clients, list)
 706                 if (client->base.class == args->client) {
 707                         err = tegra_client_open(fpriv, client, context);
 708                         if (err < 0)
 709                                 break;
 710
 711                         args->context = context->id;
 712                         break;
 713                 }
 714
 715         if (err < 0)
 716                 kfree(context);
 717
 718         mutex_unlock(&fpriv->lock);
 719         return err;
 720 }
 721
 722 static int tegra_close_channel(struct drm_device *drm, void *data,
 723                                struct drm_file *file)
 724 {
 725         struct tegra_drm_file *fpriv = file->driver_priv;
 726         struct drm_tegra_close_channel *args = data;
 727         struct tegra_drm_context *context;
 728         int err = 0;
 729
 730         mutex_lock(&fpriv->lock);
 731
 732         context = idr_find(&fpriv->contexts, args->context);
 733         if (!context) {
 734                 err = -EINVAL;
 735                 goto unlock;
 736         }
 737
 738         idr_remove(&fpriv->contexts, context->id);
 739         tegra_drm_context_free(context);
 740
 741 unlock:
 742         mutex_unlock(&fpriv->lock);
 743         return err;
 744 }
 745
 746 static int tegra_get_syncpt(struct drm_device *drm, void *data,
 747                             struct drm_file *file)
 748 {
 749         struct tegra_drm_file *fpriv = file->driver_priv;
 750         struct drm_tegra_get_syncpt *args = data;
 751         struct tegra_drm_context *context;
 752         struct host1x_syncpt *syncpt;
 753         int err = 0;
 754
 755         mutex_lock(&fpriv->lock);
 756
 757         context = idr_find(&fpriv->contexts, args->context);
 758         if (!context) {
 759                 err = -ENODEV;
 760                 goto unlock;
 761         }
 762
 763         if (args->index >= context->client->base.num_syncpts) {
 764                 err = -EINVAL;
 765                 goto unlock;
 766         }
 767
 768         syncpt = context->client->base.syncpts[args->index];
 769         args->id = host1x_syncpt_id(syncpt);
 770
 771 unlock:
 772         mutex_unlock(&fpriv->lock);
 773         return err;
 774 }
 775
 776 static int tegra_submit(struct drm_device *drm, void *data,
 777                         struct drm_file *file)
 778 {
 779         struct tegra_drm_file *fpriv = file->driver_priv;
 780         struct drm_tegra_submit *args = data;
 781         struct tegra_drm_context *context;
 782         int err;
 783
 784         mutex_lock(&fpriv->lock);
 785
 786         context = idr_find(&fpriv->contexts, args->context);
 787         if (!context) {
 788                 err = -ENODEV;
 789                 goto unlock;
 790         }
 791
 792         err = context->client->ops->submit(context, args, drm, file);
 793
 794 unlock:
 795         mutex_unlock(&fpriv->lock);
 796         return err;
 797 }
 798
 799 static int tegra_get_syncpt_base(struct drm_device *drm, void *data,
 800                                  struct drm_file *file)
 801 {
 802         struct tegra_drm_file *fpriv = file->driver_priv;
 803         struct drm_tegra_get_syncpt_base *args = data;
 804         struct tegra_drm_context *context;
 805         struct host1x_syncpt_base *base;
 806         struct host1x_syncpt *syncpt;
 807         int err = 0;
 808
 809         mutex_lock(&fpriv->lock);
 810
 811         context = idr_find(&fpriv->contexts, args->context);
 812         if (!context) {
 813                 err = -ENODEV;
 814                 goto unlock;
 815         }
 816
 817         if (args->syncpt >= context->client->base.num_syncpts) {
 818                 err = -EINVAL;
 819                 goto unlock;
 820         }
 821
 822         syncpt = context->client->base.syncpts[args->syncpt];
 823
 824         base = host1x_syncpt_get_base(syncpt);
 825         if (!base) {
 826                 err = -ENXIO;
 827                 goto unlock;
 828         }
 829
 830         args->id = host1x_syncpt_base_id(base);
 831
 832 unlock:
 833         mutex_unlock(&fpriv->lock);
 834         return err;
 835 }
 836
 837 static int tegra_gem_set_tiling(struct drm_device *drm, void *data,
 838                                 struct drm_file *file)
 839 {
 840         struct drm_tegra_gem_set_tiling *args = data;
 841         enum tegra_bo_tiling_mode mode;
 842         struct drm_gem_object *gem;
 843         unsigned long value = 0;
 844         struct tegra_bo *bo;
 845
 846         switch (args->mode) {
 847         case DRM_TEGRA_GEM_TILING_MODE_PITCH:
 848                 mode = TEGRA_BO_TILING_MODE_PITCH;
 849
 850                 if (args->value != 0)
 851                         return -EINVAL;
 852
 853                 break;
 854
 855         case DRM_TEGRA_GEM_TILING_MODE_TILED:
 856                 mode = TEGRA_BO_TILING_MODE_TILED;
 857
 858                 if (args->value != 0)
 859                         return -EINVAL;
 860
 861                 break;
 862
 863         case DRM_TEGRA_GEM_TILING_MODE_BLOCK:
 864                 mode = TEGRA_BO_TILING_MODE_BLOCK;
 865
 866                 if (args->value > 5)
 867                         return -EINVAL;
 868
 869                 value = args->value;
 870                 break;
 871
 872         default:
 873                 return -EINVAL;
 874         }
 875
 876         gem = drm_gem_object_lookup(file, args->handle);
 877         if (!gem)
 878                 return -ENOENT;
 879
 880         bo = to_tegra_bo(gem);
 881
 882         bo->tiling.mode = mode;
 883         bo->tiling.value = value;
 884
 885         drm_gem_object_put_unlocked(gem);
 886
 887         return 0;
 888 }
 889
 890 static int tegra_gem_get_tiling(struct drm_device *drm, void *data,
 891                                 struct drm_file *file)
 892 {
 893         struct drm_tegra_gem_get_tiling *args = data;
 894         struct drm_gem_object *gem;
 895         struct tegra_bo *bo;
 896         int err = 0;
 897
 898         gem = drm_gem_object_lookup(file, args->handle);
 899         if (!gem)
 900                 return -ENOENT;
 901
 902         bo = to_tegra_bo(gem);
 903
 904         switch (bo->tiling.mode) {
 905         case TEGRA_BO_TILING_MODE_PITCH:
 906                 args->mode = DRM_TEGRA_GEM_TILING_MODE_PITCH;
 907                 args->value = 0;
 908                 break;
 909
 910         case TEGRA_BO_TILING_MODE_TILED:
 911                 args->mode = DRM_TEGRA_GEM_TILING_MODE_TILED;
 912                 args->value = 0;
 913                 break;
 914
 915         case TEGRA_BO_TILING_MODE_BLOCK:
 916                 args->mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK;
 917                 args->value = bo->tiling.value;
 918                 break;
 919
 920         default:
 921                 err = -EINVAL;
 922                 break;
 923         }
 924
 925         drm_gem_object_put_unlocked(gem);
 926
 927         return err;
 928 }
 929
 930 static int tegra_gem_set_flags(struct drm_device *drm, void *data,
 931                                struct drm_file *file)
 932 {
 933         struct drm_tegra_gem_set_flags *args = data;
 934         struct drm_gem_object *gem;
 935         struct tegra_bo *bo;
 936
 937         if (args->flags & ~DRM_TEGRA_GEM_FLAGS)
 938                 return -EINVAL;
 939
 940         gem = drm_gem_object_lookup(file, args->handle);
 941         if (!gem)
 942                 return -ENOENT;
 943
 944         bo = to_tegra_bo(gem);
 945         bo->flags = 0;
 946
 947         if (args->flags & DRM_TEGRA_GEM_BOTTOM_UP)
 948                 bo->flags |= TEGRA_BO_BOTTOM_UP;
 949
 950         drm_gem_object_put_unlocked(gem);
 951
 952         return 0;
 953 }
 954
 955 static int tegra_gem_get_flags(struct drm_device *drm, void *data,
 956                                struct drm_file *file)
 957 {
 958         struct drm_tegra_gem_get_flags *args = data;
 959         struct drm_gem_object *gem;
 960         struct tegra_bo *bo;
 961
 962         gem = drm_gem_object_lookup(file, args->handle);
 963         if (!gem)
 964                 return -ENOENT;
 965
 966         bo = to_tegra_bo(gem);
 967         args->flags = 0;
 968
 969         if (bo->flags & TEGRA_BO_BOTTOM_UP)
 970                 args->flags |= DRM_TEGRA_GEM_BOTTOM_UP;
 971
 972         drm_gem_object_put_unlocked(gem);
 973
 974         return 0;
 975 }
 976 #endif
 977
 978 static const struct drm_ioctl_desc tegra_drm_ioctls[] = {
 979 #ifdef CONFIG_DRM_TEGRA_STAGING
 980         DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create,
 981                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 982         DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap,
 983                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 984         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read,
 985                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 986         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr,
 987                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 988         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait,
 989                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 990         DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel,
 991                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 992         DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel,
 993                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 994         DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt,
 995                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 996         DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit,
 997                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 998         DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT_BASE, tegra_get_syncpt_base,
 999                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
1000         DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_TILING, tegra_gem_set_tiling,
1001                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
1002         DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_TILING, tegra_gem_get_tiling,
1003                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
1004         DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_FLAGS, tegra_gem_set_flags,
1005                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
1006         DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_FLAGS, tegra_gem_get_flags,
1007                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
1008 #endif
1009 };
1010
1011 static const struct file_operations tegra_drm_fops = {
1012         .owner = THIS_MODULE,
1013         .open = drm_open,
1014         .release = drm_release,
1015         .unlocked_ioctl = drm_ioctl,
1016         .mmap = tegra_drm_mmap,
1017         .poll = drm_poll,
1018         .read = drm_read,
1019         .compat_ioctl = drm_compat_ioctl,
1020         .llseek = noop_llseek,
1021 };
1022
1023 static int tegra_drm_context_cleanup(int id, void *p, void *data)
1024 {
1025         struct tegra_drm_context *context = p;
1026
1027         tegra_drm_context_free(context);
1028
1029         return 0;
1030 }
1031
1032 static void tegra_drm_postclose(struct drm_device *drm, struct drm_file *file)
1033 {
1034         struct tegra_drm_file *fpriv = file->driver_priv;
1035
1036         mutex_lock(&fpriv->lock);
1037         idr_for_each(&fpriv->contexts, tegra_drm_context_cleanup, NULL);
1038         mutex_unlock(&fpriv->lock);
1039
1040         idr_destroy(&fpriv->contexts);
1041         mutex_destroy(&fpriv->lock);
1042         kfree(fpriv);
1043 }
1044
1045 #ifdef CONFIG_DEBUG_FS
1046 static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
1047 {
1048         struct drm_info_node *node = (struct drm_info_node *)s->private;
1049         struct drm_device *drm = node->minor->dev;
1050         struct drm_framebuffer *fb;
1051
1052         mutex_lock(&drm->mode_config.fb_lock);
1053
1054         list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
1055                 seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
1056                            fb->base.id, fb->width, fb->height,
1057                            fb->format->depth,
1058                            fb->format->cpp[0] * 8,
1059                            drm_framebuffer_read_refcount(fb));
1060         }
1061
1062         mutex_unlock(&drm->mode_config.fb_lock);
1063
1064         return 0;
1065 }
1066
1067 static int tegra_debugfs_iova(struct seq_file *s, void *data)
1068 {
1069         struct drm_info_node *node = (struct drm_info_node *)s->private;
1070         struct drm_device *drm = node->minor->dev;
1071         struct tegra_drm *tegra = drm->dev_private;
1072         struct drm_printer p = drm_seq_file_printer(s);
1073
1074         if (tegra->domain) {
1075                 mutex_lock(&tegra->mm_lock);
1076                 drm_mm_print(&tegra->mm, &p);
1077                 mutex_unlock(&tegra->mm_lock);
1078         }
1079
1080         return 0;
1081 }
1082
1083 static struct drm_info_list tegra_debugfs_list[] = {
1084         { "framebuffers", tegra_debugfs_framebuffers, 0 },
1085         { "iova", tegra_debugfs_iova, 0 },
1086 };
1087
1088 static int tegra_debugfs_init(struct drm_minor *minor)
1089 {
1090         return drm_debugfs_create_files(tegra_debugfs_list,
1091                                         ARRAY_SIZE(tegra_debugfs_list),
1092                                         minor->debugfs_root, minor);
1093 }
1094 #endif
1095
1096 static struct drm_driver tegra_drm_driver = {
1097         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
1098                            DRIVER_ATOMIC | DRIVER_RENDER,
1099         .load = tegra_drm_load,
1100         .unload = tegra_drm_unload,
1101         .open = tegra_drm_open,
1102         .postclose = tegra_drm_postclose,
1103         .lastclose = tegra_drm_lastclose,
1104
1105 #if defined(CONFIG_DEBUG_FS)
1106         .debugfs_init = tegra_debugfs_init,
1107 #endif
1108
1109         .gem_free_object_unlocked = tegra_bo_free_object,
1110         .gem_vm_ops = &tegra_bo_vm_ops,
1111
1112         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
1113         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
1114         .gem_prime_export = tegra_gem_prime_export,
1115         .gem_prime_import = tegra_gem_prime_import,
1116
1117         .dumb_create = tegra_bo_dumb_create,
1118
1119         .ioctls = tegra_drm_ioctls,
1120         .num_ioctls = ARRAY_SIZE(tegra_drm_ioctls),
1121         .fops = &tegra_drm_fops,
1122
1123         .name = DRIVER_NAME,
1124         .desc = DRIVER_DESC,
1125         .date = DRIVER_DATE,
1126         .major = DRIVER_MAJOR,
1127         .minor = DRIVER_MINOR,
1128         .patchlevel = DRIVER_PATCHLEVEL,
1129 };
1130
1131 int tegra_drm_register_client(struct tegra_drm *tegra,
1132                               struct tegra_drm_client *client)
1133 {
1134         mutex_lock(&tegra->clients_lock);
1135         list_add_tail(&client->list, &tegra->clients);
1136         mutex_unlock(&tegra->clients_lock);
1137
1138         return 0;
1139 }
1140
1141 int tegra_drm_unregister_client(struct tegra_drm *tegra,
1142                                 struct tegra_drm_client *client)
1143 {
1144         mutex_lock(&tegra->clients_lock);
1145         list_del_init(&client->list);
1146         mutex_unlock(&tegra->clients_lock);
1147
1148         return 0;
1149 }
1150
1151 void *tegra_drm_alloc(struct tegra_drm *tegra, size_t size,
1152                               dma_addr_t *dma)
1153 {
1154         struct iova *alloc;
1155         void *virt;
1156         gfp_t gfp;
1157         int err;
1158
1159         if (tegra->domain)
1160                 size = iova_align(&tegra->carveout.domain, size);
1161         else
1162                 size = PAGE_ALIGN(size);
1163
1164         gfp = GFP_KERNEL | __GFP_ZERO;
1165         if (!tegra->domain) {
1166                 /*
1167                  * Many units only support 32-bit addresses, even on 64-bit
1168                  * SoCs. If there is no IOMMU to translate into a 32-bit IO
1169                  * virtual address space, force allocations to be in the
1170                  * lower 32-bit range.
1171                  */
1172                 gfp |= GFP_DMA;
1173         }
1174
1175         virt = (void *)__get_free_pages(gfp, get_order(size));
1176         if (!virt)
1177                 return ERR_PTR(-ENOMEM);
1178
1179         if (!tegra->domain) {
1180                 /*
1181                  * If IOMMU is disabled, devices address physical memory
1182                  * directly.
1183                  */
1184                 *dma = virt_to_phys(virt);
1185                 return virt;
1186         }
1187
1188         alloc = alloc_iova(&tegra->carveout.domain,
1189                            size >> tegra->carveout.shift,
1190                            tegra->carveout.limit, true);
1191         if (!alloc) {
1192                 err = -EBUSY;
1193                 goto free_pages;
1194         }
1195
1196         *dma = iova_dma_addr(&tegra->carveout.domain, alloc);
1197         err = iommu_map(tegra->domain, *dma, virt_to_phys(virt),
1198                         size, IOMMU_READ | IOMMU_WRITE);
1199         if (err < 0)
1200                 goto free_iova;
1201
1202         return virt;
1203
1204 free_iova:
1205         __free_iova(&tegra->carveout.domain, alloc);
1206 free_pages:
1207         free_pages((unsigned long)virt, get_order(size));
1208
1209         return ERR_PTR(err);
1210 }
1211
1212 void tegra_drm_free(struct tegra_drm *tegra, size_t size, void *virt,
1213                     dma_addr_t dma)
1214 {
1215         if (tegra->domain)
1216                 size = iova_align(&tegra->carveout.domain, size);
1217         else
1218                 size = PAGE_ALIGN(size);
1219
1220         if (tegra->domain) {
1221                 iommu_unmap(tegra->domain, dma, size);
1222                 free_iova(&tegra->carveout.domain,
1223                           iova_pfn(&tegra->carveout.domain, dma));
1224         }
1225
1226         free_pages((unsigned long)virt, get_order(size));
1227 }
1228
1229 static int host1x_drm_probe(struct host1x_device *dev)
1230 {
1231         struct drm_driver *driver = &tegra_drm_driver;
1232         struct drm_device *drm;
1233         int err;
1234
1235         drm = drm_dev_alloc(driver, &dev->dev);
1236         if (IS_ERR(drm))
1237                 return PTR_ERR(drm);
1238
1239         dev_set_drvdata(&dev->dev, drm);
1240
1241         err = drm_dev_register(drm, 0);
1242         if (err < 0)
1243                 goto unref;
1244
1245         return 0;
1246
1247 unref:
1248         drm_dev_unref(drm);
1249         return err;
1250 }
1251
1252 static int host1x_drm_remove(struct host1x_device *dev)
1253 {
1254         struct drm_device *drm = dev_get_drvdata(&dev->dev);
1255
1256         drm_dev_unregister(drm);
1257         drm_dev_unref(drm);
1258
1259         return 0;
1260 }
1261
1262 #ifdef CONFIG_PM_SLEEP
1263 static int host1x_drm_suspend(struct device *dev)
1264 {
1265         struct drm_device *drm = dev_get_drvdata(dev);
1266         struct tegra_drm *tegra = drm->dev_private;
1267
1268         drm_kms_helper_poll_disable(drm);
1269         tegra_drm_fb_suspend(drm);
1270
1271         tegra->state = drm_atomic_helper_suspend(drm);
1272         if (IS_ERR(tegra->state)) {
1273                 tegra_drm_fb_resume(drm);
1274                 drm_kms_helper_poll_enable(drm);
1275                 return PTR_ERR(tegra->state);
1276         }
1277
1278         return 0;
1279 }
1280
1281 static int host1x_drm_resume(struct device *dev)
1282 {
1283         struct drm_device *drm = dev_get_drvdata(dev);
1284         struct tegra_drm *tegra = drm->dev_private;
1285
1286         drm_atomic_helper_resume(drm, tegra->state);
1287         tegra_drm_fb_resume(drm);
1288         drm_kms_helper_poll_enable(drm);
1289
1290         return 0;
1291 }
1292 #endif
1293
1294 static SIMPLE_DEV_PM_OPS(host1x_drm_pm_ops, host1x_drm_suspend,
1295                          host1x_drm_resume);
1296
1297 static const struct of_device_id host1x_drm_subdevs[] = {
1298         { .compatible = "nvidia,tegra20-dc", },
1299         { .compatible = "nvidia,tegra20-hdmi", },
1300         { .compatible = "nvidia,tegra20-gr2d", },
1301         { .compatible = "nvidia,tegra20-gr3d", },
1302         { .compatible = "nvidia,tegra30-dc", },
1303         { .compatible = "nvidia,tegra30-hdmi", },
1304         { .compatible = "nvidia,tegra30-gr2d", },
1305         { .compatible = "nvidia,tegra30-gr3d", },
1306         { .compatible = "nvidia,tegra114-dsi", },
1307         { .compatible = "nvidia,tegra114-hdmi", },
1308         { .compatible = "nvidia,tegra114-gr3d", },
1309         { .compatible = "nvidia,tegra124-dc", },
1310         { .compatible = "nvidia,tegra124-sor", },
1311         { .compatible = "nvidia,tegra124-hdmi", },
1312         { .compatible = "nvidia,tegra124-dsi", },
1313         { .compatible = "nvidia,tegra124-vic", },
1314         { .compatible = "nvidia,tegra132-dsi", },
1315         { .compatible = "nvidia,tegra210-dc", },
1316         { .compatible = "nvidia,tegra210-dsi", },
1317         { .compatible = "nvidia,tegra210-sor", },
1318         { .compatible = "nvidia,tegra210-sor1", },
1319         { .compatible = "nvidia,tegra210-vic", },
1320         { /* sentinel */ }
1321 };
1322
1323 static struct host1x_driver host1x_drm_driver = {
1324         .driver = {
1325                 .name = "drm",
1326                 .pm = &host1x_drm_pm_ops,
1327         },
1328         .probe = host1x_drm_probe,
1329         .remove = host1x_drm_remove,
1330         .subdevs = host1x_drm_subdevs,
1331 };
1332
1333 static struct platform_driver * const drivers[] = {
1334         &tegra_dc_driver,
1335         &tegra_hdmi_driver,
1336         &tegra_dsi_driver,
1337         &tegra_dpaux_driver,
1338         &tegra_sor_driver,
1339         &tegra_gr2d_driver,
1340         &tegra_gr3d_driver,
1341         &tegra_vic_driver,
1342 };
1343
1344 static int __init host1x_drm_init(void)
1345 {
1346         int err;
1347
1348         err = host1x_driver_register(&host1x_drm_driver);
1349         if (err < 0)
1350                 return err;
1351
1352         err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
1353         if (err < 0)
1354                 goto unregister_host1x;
1355
1356         return 0;
1357
1358 unregister_host1x:
1359         host1x_driver_unregister(&host1x_drm_driver);
1360         return err;
1361 }
1362 module_init(host1x_drm_init);
1363
1364 static void __exit host1x_drm_exit(void)
1365 {
1366         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
1367         host1x_driver_unregister(&host1x_drm_driver);
1368 }
1369 module_exit(host1x_drm_exit);
1370
1371 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
1372 MODULE_DESCRIPTION("NVIDIA Tegra DRM driver");
1373 MODULE_LICENSE("GPL v2");