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 int tegra_atomic_check(struct drm_device *drm,
  37                               struct drm_atomic_state *state)
  38 {
  39         int err;
  40
  41         err = drm_atomic_helper_check_modeset(drm, state);
  42         if (err < 0)
  43                 return err;
  44
  45         err = drm_atomic_normalize_zpos(drm, state);
  46         if (err < 0)
  47                 return err;
  48
  49         err = drm_atomic_helper_check_planes(drm, state);
  50         if (err < 0)
  51                 return err;
  52
  53         if (state->legacy_cursor_update)
  54                 state->async_update = !drm_atomic_helper_async_check(drm, state);
  55
  56         return 0;
  57 }
  58
  59 static struct drm_atomic_state *
  60 tegra_atomic_state_alloc(struct drm_device *drm)
  61 {
  62         struct tegra_atomic_state *state = kzalloc(sizeof(*state), GFP_KERNEL);
  63
  64         if (!state || drm_atomic_state_init(drm, &state->base) < 0) {
  65                 kfree(state);
  66                 return NULL;
  67         }
  68
  69         return &state->base;
  70 }
  71
  72 static void tegra_atomic_state_clear(struct drm_atomic_state *state)
  73 {
  74         struct tegra_atomic_state *tegra = to_tegra_atomic_state(state);
  75
  76         drm_atomic_state_default_clear(state);
  77         tegra->clk_disp = NULL;
  78         tegra->dc = NULL;
  79         tegra->rate = 0;
  80 }
  81
  82 static void tegra_atomic_state_free(struct drm_atomic_state *state)
  83 {
  84         drm_atomic_state_default_release(state);
  85         kfree(state);
  86 }
  87
  88 static const struct drm_mode_config_funcs tegra_drm_mode_config_funcs = {
  89         .fb_create = tegra_fb_create,
  90 #ifdef CONFIG_DRM_FBDEV_EMULATION
  91         .output_poll_changed = drm_fb_helper_output_poll_changed,
  92 #endif
  93         .atomic_check = tegra_atomic_check,
  94         .atomic_commit = drm_atomic_helper_commit,
  95         .atomic_state_alloc = tegra_atomic_state_alloc,
  96         .atomic_state_clear = tegra_atomic_state_clear,
  97         .atomic_state_free = tegra_atomic_state_free,
  98 };
  99
 100 static void tegra_atomic_commit_tail(struct drm_atomic_state *old_state)
 101 {
 102         struct drm_device *drm = old_state->dev;
 103         struct tegra_drm *tegra = drm->dev_private;
 104
 105         if (tegra->hub) {
 106                 drm_atomic_helper_commit_modeset_disables(drm, old_state);
 107                 tegra_display_hub_atomic_commit(drm, old_state);
 108                 drm_atomic_helper_commit_planes(drm, old_state, 0);
 109                 drm_atomic_helper_commit_modeset_enables(drm, old_state);
 110                 drm_atomic_helper_commit_hw_done(old_state);
 111                 drm_atomic_helper_wait_for_vblanks(drm, old_state);
 112                 drm_atomic_helper_cleanup_planes(drm, old_state);
 113         } else {
 114                 drm_atomic_helper_commit_tail_rpm(old_state);
 115         }
 116 }
 117
 118 static const struct drm_mode_config_helper_funcs
 119 tegra_drm_mode_config_helpers = {
 120         .atomic_commit_tail = tegra_atomic_commit_tail,
 121 };
 122
 123 static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
 124 {
 125         struct host1x_device *device = to_host1x_device(drm->dev);
 126         struct tegra_drm *tegra;
 127         int err;
 128
 129         tegra = kzalloc(sizeof(*tegra), GFP_KERNEL);
 130         if (!tegra)
 131                 return -ENOMEM;
 132
 133         if (iommu_present(&platform_bus_type)) {
 134                 u64 carveout_start, carveout_end, gem_start, gem_end;
 135                 struct iommu_domain_geometry *geometry;
 136                 unsigned long order;
 137
 138                 tegra->domain = iommu_domain_alloc(&platform_bus_type);
 139                 if (!tegra->domain) {
 140                         err = -ENOMEM;
 141                         goto free;
 142                 }
 143
 144                 geometry = &tegra->domain->geometry;
 145                 gem_start = geometry->aperture_start;
 146                 gem_end = geometry->aperture_end - CARVEOUT_SZ;
 147                 carveout_start = gem_end + 1;
 148                 carveout_end = geometry->aperture_end;
 149
 150                 order = __ffs(tegra->domain->pgsize_bitmap);
 151                 init_iova_domain(&tegra->carveout.domain, 1UL << order,
 152                                  carveout_start >> order);
 153
 154                 tegra->carveout.shift = iova_shift(&tegra->carveout.domain);
 155                 tegra->carveout.limit = carveout_end >> tegra->carveout.shift;
 156
 157                 drm_mm_init(&tegra->mm, gem_start, gem_end - gem_start + 1);
 158                 mutex_init(&tegra->mm_lock);
 159
 160                 DRM_DEBUG("IOMMU apertures:\n");
 161                 DRM_DEBUG("  GEM: %#llx-%#llx\n", gem_start, gem_end);
 162                 DRM_DEBUG("  Carveout: %#llx-%#llx\n", carveout_start,
 163                           carveout_end);
 164         }
 165
 166         mutex_init(&tegra->clients_lock);
 167         INIT_LIST_HEAD(&tegra->clients);
 168
 169         drm->dev_private = tegra;
 170         tegra->drm = drm;
 171
 172         drm_mode_config_init(drm);
 173
 174         drm->mode_config.min_width = 0;
 175         drm->mode_config.min_height = 0;
 176
 177         drm->mode_config.max_width = 4096;
 178         drm->mode_config.max_height = 4096;
 179
 180         drm->mode_config.allow_fb_modifiers = true;
 181
 182         drm->mode_config.funcs = &tegra_drm_mode_config_funcs;
 183         drm->mode_config.helper_private = &tegra_drm_mode_config_helpers;
 184
 185         err = tegra_drm_fb_prepare(drm);
 186         if (err < 0)
 187                 goto config;
 188
 189         drm_kms_helper_poll_init(drm);
 190
 191         err = host1x_device_init(device);
 192         if (err < 0)
 193                 goto fbdev;
 194
 195         if (tegra->hub) {
 196                 err = tegra_display_hub_prepare(tegra->hub);
 197                 if (err < 0)
 198                         goto device;
 199         }
 200
 201         /*
 202          * We don't use the drm_irq_install() helpers provided by the DRM
 203          * core, so we need to set this manually in order to allow the
 204          * DRM_IOCTL_WAIT_VBLANK to operate correctly.
 205          */
 206         drm->irq_enabled = true;
 207
 208         /* syncpoints are used for full 32-bit hardware VBLANK counters */
 209         drm->max_vblank_count = 0xffffffff;
 210
 211         err = drm_vblank_init(drm, drm->mode_config.num_crtc);
 212         if (err < 0)
 213                 goto hub;
 214
 215         drm_mode_config_reset(drm);
 216
 217         err = tegra_drm_fb_init(drm);
 218         if (err < 0)
 219                 goto hub;
 220
 221         return 0;
 222
 223 hub:
 224         if (tegra->hub)
 225                 tegra_display_hub_cleanup(tegra->hub);
 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 struct host1x_bo *
 291 host1x_bo_lookup(struct drm_file *file, u32 handle)
 292 {
 293         struct drm_gem_object *gem;
 294         struct tegra_bo *bo;
 295
 296         gem = drm_gem_object_lookup(file, handle);
 297         if (!gem)
 298                 return NULL;
 299
 300         bo = to_tegra_bo(gem);
 301         return &bo->base;
 302 }
 303
 304 static int host1x_reloc_copy_from_user(struct host1x_reloc *dest,
 305                                        struct drm_tegra_reloc __user *src,
 306                                        struct drm_device *drm,
 307                                        struct drm_file *file)
 308 {
 309         u32 cmdbuf, target;
 310         int err;
 311
 312         err = get_user(cmdbuf, &src->cmdbuf.handle);
 313         if (err < 0)
 314                 return err;
 315
 316         err = get_user(dest->cmdbuf.offset, &src->cmdbuf.offset);
 317         if (err < 0)
 318                 return err;
 319
 320         err = get_user(target, &src->target.handle);
 321         if (err < 0)
 322                 return err;
 323
 324         err = get_user(dest->target.offset, &src->target.offset);
 325         if (err < 0)
 326                 return err;
 327
 328         err = get_user(dest->shift, &src->shift);
 329         if (err < 0)
 330                 return err;
 331
 332         dest->cmdbuf.bo = host1x_bo_lookup(file, cmdbuf);
 333         if (!dest->cmdbuf.bo)
 334                 return -ENOENT;
 335
 336         dest->target.bo = host1x_bo_lookup(file, target);
 337         if (!dest->target.bo)
 338                 return -ENOENT;
 339
 340         return 0;
 341 }
 342
 343 static int host1x_waitchk_copy_from_user(struct host1x_waitchk *dest,
 344                                          struct drm_tegra_waitchk __user *src,
 345                                          struct drm_file *file)
 346 {
 347         u32 cmdbuf;
 348         int err;
 349
 350         err = get_user(cmdbuf, &src->handle);
 351         if (err < 0)
 352                 return err;
 353
 354         err = get_user(dest->offset, &src->offset);
 355         if (err < 0)
 356                 return err;
 357
 358         err = get_user(dest->syncpt_id, &src->syncpt);
 359         if (err < 0)
 360                 return err;
 361
 362         err = get_user(dest->thresh, &src->thresh);
 363         if (err < 0)
 364                 return err;
 365
 366         dest->bo = host1x_bo_lookup(file, cmdbuf);
 367         if (!dest->bo)
 368                 return -ENOENT;
 369
 370         return 0;
 371 }
 372
 373 int tegra_drm_submit(struct tegra_drm_context *context,
 374                      struct drm_tegra_submit *args, struct drm_device *drm,
 375                      struct drm_file *file)
 376 {
 377         unsigned int num_cmdbufs = args->num_cmdbufs;
 378         unsigned int num_relocs = args->num_relocs;
 379         unsigned int num_waitchks = args->num_waitchks;
 380         struct drm_tegra_cmdbuf __user *user_cmdbufs;
 381         struct drm_tegra_reloc __user *user_relocs;
 382         struct drm_tegra_waitchk __user *user_waitchks;
 383         struct drm_tegra_syncpt __user *user_syncpt;
 384         struct drm_tegra_syncpt syncpt;
 385         struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
 386         struct drm_gem_object **refs;
 387         struct host1x_syncpt *sp;
 388         struct host1x_job *job;
 389         unsigned int num_refs;
 390         int err;
 391
 392         user_cmdbufs = u64_to_user_ptr(args->cmdbufs);
 393         user_relocs = u64_to_user_ptr(args->relocs);
 394         user_waitchks = u64_to_user_ptr(args->waitchks);
 395         user_syncpt = u64_to_user_ptr(args->syncpts);
 396
 397         /* We don't yet support other than one syncpt_incr struct per submit */
 398         if (args->num_syncpts != 1)
 399                 return -EINVAL;
 400
 401         /* We don't yet support waitchks */
 402         if (args->num_waitchks != 0)
 403                 return -EINVAL;
 404
 405         job = host1x_job_alloc(context->channel, args->num_cmdbufs,
 406                                args->num_relocs, args->num_waitchks);
 407         if (!job)
 408                 return -ENOMEM;
 409
 410         job->num_relocs = args->num_relocs;
 411         job->num_waitchk = args->num_waitchks;
 412         job->client = (u32)args->context;
 413         job->class = context->client->base.class;
 414         job->serialize = true;
 415
 416         /*
 417          * Track referenced BOs so that they can be unreferenced after the
 418          * submission is complete.
 419          */
 420         num_refs = num_cmdbufs + num_relocs * 2 + num_waitchks;
 421
 422         refs = kmalloc_array(num_refs, sizeof(*refs), GFP_KERNEL);
 423         if (!refs) {
 424                 err = -ENOMEM;
 425                 goto put;
 426         }
 427
 428         /* reuse as an iterator later */
 429         num_refs = 0;
 430
 431         while (num_cmdbufs) {
 432                 struct drm_tegra_cmdbuf cmdbuf;
 433                 struct host1x_bo *bo;
 434                 struct tegra_bo *obj;
 435                 u64 offset;
 436
 437                 if (copy_from_user(&cmdbuf, user_cmdbufs, sizeof(cmdbuf))) {
 438                         err = -EFAULT;
 439                         goto fail;
 440                 }
 441
 442                 /*
 443                  * The maximum number of CDMA gather fetches is 16383, a higher
 444                  * value means the words count is malformed.
 445                  */
 446                 if (cmdbuf.words > CDMA_GATHER_FETCHES_MAX_NB) {
 447                         err = -EINVAL;
 448                         goto fail;
 449                 }
 450
 451                 bo = host1x_bo_lookup(file, cmdbuf.handle);
 452                 if (!bo) {
 453                         err = -ENOENT;
 454                         goto fail;
 455                 }
 456
 457                 offset = (u64)cmdbuf.offset + (u64)cmdbuf.words * sizeof(u32);
 458                 obj = host1x_to_tegra_bo(bo);
 459                 refs[num_refs++] = &obj->gem;
 460
 461                 /*
 462                  * Gather buffer base address must be 4-bytes aligned,
 463                  * unaligned offset is malformed and cause commands stream
 464                  * corruption on the buffer address relocation.
 465                  */
 466                 if (offset & 3 || offset >= obj->gem.size) {
 467                         err = -EINVAL;
 468                         goto fail;
 469                 }
 470
 471                 host1x_job_add_gather(job, bo, cmdbuf.words, cmdbuf.offset);
 472                 num_cmdbufs--;
 473                 user_cmdbufs++;
 474         }
 475
 476         /* copy and resolve relocations from submit */
 477         while (num_relocs--) {
 478                 struct host1x_reloc *reloc;
 479                 struct tegra_bo *obj;
 480
 481                 err = host1x_reloc_copy_from_user(&job->relocarray[num_relocs],
 482                                                   &user_relocs[num_relocs], drm,
 483                                                   file);
 484                 if (err < 0)
 485                         goto fail;
 486
 487                 reloc = &job->relocarray[num_relocs];
 488                 obj = host1x_to_tegra_bo(reloc->cmdbuf.bo);
 489                 refs[num_refs++] = &obj->gem;
 490
 491                 /*
 492                  * The unaligned cmdbuf offset will cause an unaligned write
 493                  * during of the relocations patching, corrupting the commands
 494                  * stream.
 495                  */
 496                 if (reloc->cmdbuf.offset & 3 ||
 497                     reloc->cmdbuf.offset >= obj->gem.size) {
 498                         err = -EINVAL;
 499                         goto fail;
 500                 }
 501
 502                 obj = host1x_to_tegra_bo(reloc->target.bo);
 503                 refs[num_refs++] = &obj->gem;
 504
 505                 if (reloc->target.offset >= obj->gem.size) {
 506                         err = -EINVAL;
 507                         goto fail;
 508                 }
 509         }
 510
 511         /* copy and resolve waitchks from submit */
 512         while (num_waitchks--) {
 513                 struct host1x_waitchk *wait = &job->waitchk[num_waitchks];
 514                 struct tegra_bo *obj;
 515
 516                 err = host1x_waitchk_copy_from_user(
 517                         wait, &user_waitchks[num_waitchks], file);
 518                 if (err < 0)
 519                         goto fail;
 520
 521                 obj = host1x_to_tegra_bo(wait->bo);
 522                 refs[num_refs++] = &obj->gem;
 523
 524                 /*
 525                  * The unaligned offset will cause an unaligned write during
 526                  * of the waitchks patching, corrupting the commands stream.
 527                  */
 528                 if (wait->offset & 3 ||
 529                     wait->offset >= obj->gem.size) {
 530                         err = -EINVAL;
 531                         goto fail;
 532                 }
 533         }
 534
 535         if (copy_from_user(&syncpt, user_syncpt, sizeof(syncpt))) {
 536                 err = -EFAULT;
 537                 goto fail;
 538         }
 539
 540         /* check whether syncpoint ID is valid */
 541         sp = host1x_syncpt_get(host1x, syncpt.id);
 542         if (!sp) {
 543                 err = -ENOENT;
 544                 goto fail;
 545         }
 546
 547         job->is_addr_reg = context->client->ops->is_addr_reg;
 548         job->is_valid_class = context->client->ops->is_valid_class;
 549         job->syncpt_incrs = syncpt.incrs;
 550         job->syncpt_id = syncpt.id;
 551         job->timeout = 10000;
 552
 553         if (args->timeout && args->timeout < 10000)
 554                 job->timeout = args->timeout;
 555
 556         err = host1x_job_pin(job, context->client->base.dev);
 557         if (err)
 558                 goto fail;
 559
 560         err = host1x_job_submit(job);
 561         if (err) {
 562                 host1x_job_unpin(job);
 563                 goto fail;
 564         }
 565
 566         args->fence = job->syncpt_end;
 567
 568 fail:
 569         while (num_refs--)
 570                 drm_gem_object_put_unlocked(refs[num_refs]);
 571
 572         kfree(refs);
 573
 574 put:
 575         host1x_job_put(job);
 576         return err;
 577 }
 578
 579
 580 #ifdef CONFIG_DRM_TEGRA_STAGING
 581 static int tegra_gem_create(struct drm_device *drm, void *data,
 582                             struct drm_file *file)
 583 {
 584         struct drm_tegra_gem_create *args = data;
 585         struct tegra_bo *bo;
 586
 587         bo = tegra_bo_create_with_handle(file, drm, args->size, args->flags,
 588                                          &args->handle);
 589         if (IS_ERR(bo))
 590                 return PTR_ERR(bo);
 591
 592         return 0;
 593 }
 594
 595 static int tegra_gem_mmap(struct drm_device *drm, void *data,
 596                           struct drm_file *file)
 597 {
 598         struct drm_tegra_gem_mmap *args = data;
 599         struct drm_gem_object *gem;
 600         struct tegra_bo *bo;
 601
 602         gem = drm_gem_object_lookup(file, args->handle);
 603         if (!gem)
 604                 return -EINVAL;
 605
 606         bo = to_tegra_bo(gem);
 607
 608         args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
 609
 610         drm_gem_object_put_unlocked(gem);
 611
 612         return 0;
 613 }
 614
 615 static int tegra_syncpt_read(struct drm_device *drm, void *data,
 616                              struct drm_file *file)
 617 {
 618         struct host1x *host = dev_get_drvdata(drm->dev->parent);
 619         struct drm_tegra_syncpt_read *args = data;
 620         struct host1x_syncpt *sp;
 621
 622         sp = host1x_syncpt_get(host, args->id);
 623         if (!sp)
 624                 return -EINVAL;
 625
 626         args->value = host1x_syncpt_read_min(sp);
 627         return 0;
 628 }
 629
 630 static int tegra_syncpt_incr(struct drm_device *drm, void *data,
 631                              struct drm_file *file)
 632 {
 633         struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
 634         struct drm_tegra_syncpt_incr *args = data;
 635         struct host1x_syncpt *sp;
 636
 637         sp = host1x_syncpt_get(host1x, args->id);
 638         if (!sp)
 639                 return -EINVAL;
 640
 641         return host1x_syncpt_incr(sp);
 642 }
 643
 644 static int tegra_syncpt_wait(struct drm_device *drm, void *data,
 645                              struct drm_file *file)
 646 {
 647         struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
 648         struct drm_tegra_syncpt_wait *args = data;
 649         struct host1x_syncpt *sp;
 650
 651         sp = host1x_syncpt_get(host1x, args->id);
 652         if (!sp)
 653                 return -EINVAL;
 654
 655         return host1x_syncpt_wait(sp, args->thresh,
 656                                   msecs_to_jiffies(args->timeout),
 657                                   &args->value);
 658 }
 659
 660 static int tegra_client_open(struct tegra_drm_file *fpriv,
 661                              struct tegra_drm_client *client,
 662                              struct tegra_drm_context *context)
 663 {
 664         int err;
 665
 666         err = client->ops->open_channel(client, context);
 667         if (err < 0)
 668                 return err;
 669
 670         err = idr_alloc(&fpriv->contexts, context, 1, 0, GFP_KERNEL);
 671         if (err < 0) {
 672                 client->ops->close_channel(context);
 673                 return err;
 674         }
 675
 676         context->client = client;
 677         context->id = err;
 678
 679         return 0;
 680 }
 681
 682 static int tegra_open_channel(struct drm_device *drm, void *data,
 683                               struct drm_file *file)
 684 {
 685         struct tegra_drm_file *fpriv = file->driver_priv;
 686         struct tegra_drm *tegra = drm->dev_private;
 687         struct drm_tegra_open_channel *args = data;
 688         struct tegra_drm_context *context;
 689         struct tegra_drm_client *client;
 690         int err = -ENODEV;
 691
 692         context = kzalloc(sizeof(*context), GFP_KERNEL);
 693         if (!context)
 694                 return -ENOMEM;
 695
 696         mutex_lock(&fpriv->lock);
 697
 698         list_for_each_entry(client, &tegra->clients, list)
 699                 if (client->base.class == args->client) {
 700                         err = tegra_client_open(fpriv, client, context);
 701                         if (err < 0)
 702                                 break;
 703
 704                         args->context = context->id;
 705                         break;
 706                 }
 707
 708         if (err < 0)
 709                 kfree(context);
 710
 711         mutex_unlock(&fpriv->lock);
 712         return err;
 713 }
 714
 715 static int tegra_close_channel(struct drm_device *drm, void *data,
 716                                struct drm_file *file)
 717 {
 718         struct tegra_drm_file *fpriv = file->driver_priv;
 719         struct drm_tegra_close_channel *args = data;
 720         struct tegra_drm_context *context;
 721         int err = 0;
 722
 723         mutex_lock(&fpriv->lock);
 724
 725         context = idr_find(&fpriv->contexts, args->context);
 726         if (!context) {
 727                 err = -EINVAL;
 728                 goto unlock;
 729         }
 730
 731         idr_remove(&fpriv->contexts, context->id);
 732         tegra_drm_context_free(context);
 733
 734 unlock:
 735         mutex_unlock(&fpriv->lock);
 736         return err;
 737 }
 738
 739 static int tegra_get_syncpt(struct drm_device *drm, void *data,
 740                             struct drm_file *file)
 741 {
 742         struct tegra_drm_file *fpriv = file->driver_priv;
 743         struct drm_tegra_get_syncpt *args = data;
 744         struct tegra_drm_context *context;
 745         struct host1x_syncpt *syncpt;
 746         int err = 0;
 747
 748         mutex_lock(&fpriv->lock);
 749
 750         context = idr_find(&fpriv->contexts, args->context);
 751         if (!context) {
 752                 err = -ENODEV;
 753                 goto unlock;
 754         }
 755
 756         if (args->index >= context->client->base.num_syncpts) {
 757                 err = -EINVAL;
 758                 goto unlock;
 759         }
 760
 761         syncpt = context->client->base.syncpts[args->index];
 762         args->id = host1x_syncpt_id(syncpt);
 763
 764 unlock:
 765         mutex_unlock(&fpriv->lock);
 766         return err;
 767 }
 768
 769 static int tegra_submit(struct drm_device *drm, void *data,
 770                         struct drm_file *file)
 771 {
 772         struct tegra_drm_file *fpriv = file->driver_priv;
 773         struct drm_tegra_submit *args = data;
 774         struct tegra_drm_context *context;
 775         int err;
 776
 777         mutex_lock(&fpriv->lock);
 778
 779         context = idr_find(&fpriv->contexts, args->context);
 780         if (!context) {
 781                 err = -ENODEV;
 782                 goto unlock;
 783         }
 784
 785         err = context->client->ops->submit(context, args, drm, file);
 786
 787 unlock:
 788         mutex_unlock(&fpriv->lock);
 789         return err;
 790 }
 791
 792 static int tegra_get_syncpt_base(struct drm_device *drm, void *data,
 793                                  struct drm_file *file)
 794 {
 795         struct tegra_drm_file *fpriv = file->driver_priv;
 796         struct drm_tegra_get_syncpt_base *args = data;
 797         struct tegra_drm_context *context;
 798         struct host1x_syncpt_base *base;
 799         struct host1x_syncpt *syncpt;
 800         int err = 0;
 801
 802         mutex_lock(&fpriv->lock);
 803
 804         context = idr_find(&fpriv->contexts, args->context);
 805         if (!context) {
 806                 err = -ENODEV;
 807                 goto unlock;
 808         }
 809
 810         if (args->syncpt >= context->client->base.num_syncpts) {
 811                 err = -EINVAL;
 812                 goto unlock;
 813         }
 814
 815         syncpt = context->client->base.syncpts[args->syncpt];
 816
 817         base = host1x_syncpt_get_base(syncpt);
 818         if (!base) {
 819                 err = -ENXIO;
 820                 goto unlock;
 821         }
 822
 823         args->id = host1x_syncpt_base_id(base);
 824
 825 unlock:
 826         mutex_unlock(&fpriv->lock);
 827         return err;
 828 }
 829
 830 static int tegra_gem_set_tiling(struct drm_device *drm, void *data,
 831                                 struct drm_file *file)
 832 {
 833         struct drm_tegra_gem_set_tiling *args = data;
 834         enum tegra_bo_tiling_mode mode;
 835         struct drm_gem_object *gem;
 836         unsigned long value = 0;
 837         struct tegra_bo *bo;
 838
 839         switch (args->mode) {
 840         case DRM_TEGRA_GEM_TILING_MODE_PITCH:
 841                 mode = TEGRA_BO_TILING_MODE_PITCH;
 842
 843                 if (args->value != 0)
 844                         return -EINVAL;
 845
 846                 break;
 847
 848         case DRM_TEGRA_GEM_TILING_MODE_TILED:
 849                 mode = TEGRA_BO_TILING_MODE_TILED;
 850
 851                 if (args->value != 0)
 852                         return -EINVAL;
 853
 854                 break;
 855
 856         case DRM_TEGRA_GEM_TILING_MODE_BLOCK:
 857                 mode = TEGRA_BO_TILING_MODE_BLOCK;
 858
 859                 if (args->value > 5)
 860                         return -EINVAL;
 861
 862                 value = args->value;
 863                 break;
 864
 865         default:
 866                 return -EINVAL;
 867         }
 868
 869         gem = drm_gem_object_lookup(file, args->handle);
 870         if (!gem)
 871                 return -ENOENT;
 872
 873         bo = to_tegra_bo(gem);
 874
 875         bo->tiling.mode = mode;
 876         bo->tiling.value = value;
 877
 878         drm_gem_object_put_unlocked(gem);
 879
 880         return 0;
 881 }
 882
 883 static int tegra_gem_get_tiling(struct drm_device *drm, void *data,
 884                                 struct drm_file *file)
 885 {
 886         struct drm_tegra_gem_get_tiling *args = data;
 887         struct drm_gem_object *gem;
 888         struct tegra_bo *bo;
 889         int err = 0;
 890
 891         gem = drm_gem_object_lookup(file, args->handle);
 892         if (!gem)
 893                 return -ENOENT;
 894
 895         bo = to_tegra_bo(gem);
 896
 897         switch (bo->tiling.mode) {
 898         case TEGRA_BO_TILING_MODE_PITCH:
 899                 args->mode = DRM_TEGRA_GEM_TILING_MODE_PITCH;
 900                 args->value = 0;
 901                 break;
 902
 903         case TEGRA_BO_TILING_MODE_TILED:
 904                 args->mode = DRM_TEGRA_GEM_TILING_MODE_TILED;
 905                 args->value = 0;
 906                 break;
 907
 908         case TEGRA_BO_TILING_MODE_BLOCK:
 909                 args->mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK;
 910                 args->value = bo->tiling.value;
 911                 break;
 912
 913         default:
 914                 err = -EINVAL;
 915                 break;
 916         }
 917
 918         drm_gem_object_put_unlocked(gem);
 919
 920         return err;
 921 }
 922
 923 static int tegra_gem_set_flags(struct drm_device *drm, void *data,
 924                                struct drm_file *file)
 925 {
 926         struct drm_tegra_gem_set_flags *args = data;
 927         struct drm_gem_object *gem;
 928         struct tegra_bo *bo;
 929
 930         if (args->flags & ~DRM_TEGRA_GEM_FLAGS)
 931                 return -EINVAL;
 932
 933         gem = drm_gem_object_lookup(file, args->handle);
 934         if (!gem)
 935                 return -ENOENT;
 936
 937         bo = to_tegra_bo(gem);
 938         bo->flags = 0;
 939
 940         if (args->flags & DRM_TEGRA_GEM_BOTTOM_UP)
 941                 bo->flags |= TEGRA_BO_BOTTOM_UP;
 942
 943         drm_gem_object_put_unlocked(gem);
 944
 945         return 0;
 946 }
 947
 948 static int tegra_gem_get_flags(struct drm_device *drm, void *data,
 949                                struct drm_file *file)
 950 {
 951         struct drm_tegra_gem_get_flags *args = data;
 952         struct drm_gem_object *gem;
 953         struct tegra_bo *bo;
 954
 955         gem = drm_gem_object_lookup(file, args->handle);
 956         if (!gem)
 957                 return -ENOENT;
 958
 959         bo = to_tegra_bo(gem);
 960         args->flags = 0;
 961
 962         if (bo->flags & TEGRA_BO_BOTTOM_UP)
 963                 args->flags |= DRM_TEGRA_GEM_BOTTOM_UP;
 964
 965         drm_gem_object_put_unlocked(gem);
 966
 967         return 0;
 968 }
 969 #endif
 970
 971 static const struct drm_ioctl_desc tegra_drm_ioctls[] = {
 972 #ifdef CONFIG_DRM_TEGRA_STAGING
 973         DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create,
 974                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 975         DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap,
 976                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 977         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read,
 978                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 979         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr,
 980                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 981         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait,
 982                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 983         DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel,
 984                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 985         DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel,
 986                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 987         DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt,
 988                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 989         DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit,
 990                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 991         DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT_BASE, tegra_get_syncpt_base,
 992                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 993         DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_TILING, tegra_gem_set_tiling,
 994                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 995         DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_TILING, tegra_gem_get_tiling,
 996                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 997         DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_FLAGS, tegra_gem_set_flags,
 998                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
 999         DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_FLAGS, tegra_gem_get_flags,
1000                           DRM_UNLOCKED | DRM_RENDER_ALLOW),
1001 #endif
1002 };
1003
1004 static const struct file_operations tegra_drm_fops = {
1005         .owner = THIS_MODULE,
1006         .open = drm_open,
1007         .release = drm_release,
1008         .unlocked_ioctl = drm_ioctl,
1009         .mmap = tegra_drm_mmap,
1010         .poll = drm_poll,
1011         .read = drm_read,
1012         .compat_ioctl = drm_compat_ioctl,
1013         .llseek = noop_llseek,
1014 };
1015
1016 static int tegra_drm_context_cleanup(int id, void *p, void *data)
1017 {
1018         struct tegra_drm_context *context = p;
1019
1020         tegra_drm_context_free(context);
1021
1022         return 0;
1023 }
1024
1025 static void tegra_drm_postclose(struct drm_device *drm, struct drm_file *file)
1026 {
1027         struct tegra_drm_file *fpriv = file->driver_priv;
1028
1029         mutex_lock(&fpriv->lock);
1030         idr_for_each(&fpriv->contexts, tegra_drm_context_cleanup, NULL);
1031         mutex_unlock(&fpriv->lock);
1032
1033         idr_destroy(&fpriv->contexts);
1034         mutex_destroy(&fpriv->lock);
1035         kfree(fpriv);
1036 }
1037
1038 #ifdef CONFIG_DEBUG_FS
1039 static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
1040 {
1041         struct drm_info_node *node = (struct drm_info_node *)s->private;
1042         struct drm_device *drm = node->minor->dev;
1043         struct drm_framebuffer *fb;
1044
1045         mutex_lock(&drm->mode_config.fb_lock);
1046
1047         list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
1048                 seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
1049                            fb->base.id, fb->width, fb->height,
1050                            fb->format->depth,
1051                            fb->format->cpp[0] * 8,
1052                            drm_framebuffer_read_refcount(fb));
1053         }
1054
1055         mutex_unlock(&drm->mode_config.fb_lock);
1056
1057         return 0;
1058 }
1059
1060 static int tegra_debugfs_iova(struct seq_file *s, void *data)
1061 {
1062         struct drm_info_node *node = (struct drm_info_node *)s->private;
1063         struct drm_device *drm = node->minor->dev;
1064         struct tegra_drm *tegra = drm->dev_private;
1065         struct drm_printer p = drm_seq_file_printer(s);
1066
1067         if (tegra->domain) {
1068                 mutex_lock(&tegra->mm_lock);
1069                 drm_mm_print(&tegra->mm, &p);
1070                 mutex_unlock(&tegra->mm_lock);
1071         }
1072
1073         return 0;
1074 }
1075
1076 static struct drm_info_list tegra_debugfs_list[] = {
1077         { "framebuffers", tegra_debugfs_framebuffers, 0 },
1078         { "iova", tegra_debugfs_iova, 0 },
1079 };
1080
1081 static int tegra_debugfs_init(struct drm_minor *minor)
1082 {
1083         return drm_debugfs_create_files(tegra_debugfs_list,
1084                                         ARRAY_SIZE(tegra_debugfs_list),
1085                                         minor->debugfs_root, minor);
1086 }
1087 #endif
1088
1089 static struct drm_driver tegra_drm_driver = {
1090         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
1091                            DRIVER_ATOMIC | DRIVER_RENDER,
1092         .load = tegra_drm_load,
1093         .unload = tegra_drm_unload,
1094         .open = tegra_drm_open,
1095         .postclose = tegra_drm_postclose,
1096         .lastclose = drm_fb_helper_lastclose,
1097
1098 #if defined(CONFIG_DEBUG_FS)
1099         .debugfs_init = tegra_debugfs_init,
1100 #endif
1101
1102         .gem_free_object_unlocked = tegra_bo_free_object,
1103         .gem_vm_ops = &tegra_bo_vm_ops,
1104
1105         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
1106         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
1107         .gem_prime_export = tegra_gem_prime_export,
1108         .gem_prime_import = tegra_gem_prime_import,
1109
1110         .dumb_create = tegra_bo_dumb_create,
1111
1112         .ioctls = tegra_drm_ioctls,
1113         .num_ioctls = ARRAY_SIZE(tegra_drm_ioctls),
1114         .fops = &tegra_drm_fops,
1115
1116         .name = DRIVER_NAME,
1117         .desc = DRIVER_DESC,
1118         .date = DRIVER_DATE,
1119         .major = DRIVER_MAJOR,
1120         .minor = DRIVER_MINOR,
1121         .patchlevel = DRIVER_PATCHLEVEL,
1122 };
1123
1124 int tegra_drm_register_client(struct tegra_drm *tegra,
1125                               struct tegra_drm_client *client)
1126 {
1127         mutex_lock(&tegra->clients_lock);
1128         list_add_tail(&client->list, &tegra->clients);
1129         mutex_unlock(&tegra->clients_lock);
1130
1131         return 0;
1132 }
1133
1134 int tegra_drm_unregister_client(struct tegra_drm *tegra,
1135                                 struct tegra_drm_client *client)
1136 {
1137         mutex_lock(&tegra->clients_lock);
1138         list_del_init(&client->list);
1139         mutex_unlock(&tegra->clients_lock);
1140
1141         return 0;
1142 }
1143
1144 void *tegra_drm_alloc(struct tegra_drm *tegra, size_t size, dma_addr_t *dma)
1145 {
1146         struct iova *alloc;
1147         void *virt;
1148         gfp_t gfp;
1149         int err;
1150
1151         if (tegra->domain)
1152                 size = iova_align(&tegra->carveout.domain, size);
1153         else
1154                 size = PAGE_ALIGN(size);
1155
1156         gfp = GFP_KERNEL | __GFP_ZERO;
1157         if (!tegra->domain) {
1158                 /*
1159                  * Many units only support 32-bit addresses, even on 64-bit
1160                  * SoCs. If there is no IOMMU to translate into a 32-bit IO
1161                  * virtual address space, force allocations to be in the
1162                  * lower 32-bit range.
1163                  */
1164                 gfp |= GFP_DMA;
1165         }
1166
1167         virt = (void *)__get_free_pages(gfp, get_order(size));
1168         if (!virt)
1169                 return ERR_PTR(-ENOMEM);
1170
1171         if (!tegra->domain) {
1172                 /*
1173                  * If IOMMU is disabled, devices address physical memory
1174                  * directly.
1175                  */
1176                 *dma = virt_to_phys(virt);
1177                 return virt;
1178         }
1179
1180         alloc = alloc_iova(&tegra->carveout.domain,
1181                            size >> tegra->carveout.shift,
1182                            tegra->carveout.limit, true);
1183         if (!alloc) {
1184                 err = -EBUSY;
1185                 goto free_pages;
1186         }
1187
1188         *dma = iova_dma_addr(&tegra->carveout.domain, alloc);
1189         err = iommu_map(tegra->domain, *dma, virt_to_phys(virt),
1190                         size, IOMMU_READ | IOMMU_WRITE);
1191         if (err < 0)
1192                 goto free_iova;
1193
1194         return virt;
1195
1196 free_iova:
1197         __free_iova(&tegra->carveout.domain, alloc);
1198 free_pages:
1199         free_pages((unsigned long)virt, get_order(size));
1200
1201         return ERR_PTR(err);
1202 }
1203
1204 void tegra_drm_free(struct tegra_drm *tegra, size_t size, void *virt,
1205                     dma_addr_t dma)
1206 {
1207         if (tegra->domain)
1208                 size = iova_align(&tegra->carveout.domain, size);
1209         else
1210                 size = PAGE_ALIGN(size);
1211
1212         if (tegra->domain) {
1213                 iommu_unmap(tegra->domain, dma, size);
1214                 free_iova(&tegra->carveout.domain,
1215                           iova_pfn(&tegra->carveout.domain, dma));
1216         }
1217
1218         free_pages((unsigned long)virt, get_order(size));
1219 }
1220
1221 static int host1x_drm_probe(struct host1x_device *dev)
1222 {
1223         struct drm_driver *driver = &tegra_drm_driver;
1224         struct drm_device *drm;
1225         int err;
1226
1227         drm = drm_dev_alloc(driver, &dev->dev);
1228         if (IS_ERR(drm))
1229                 return PTR_ERR(drm);
1230
1231         dev_set_drvdata(&dev->dev, drm);
1232
1233         err = drm_dev_register(drm, 0);
1234         if (err < 0)
1235                 goto unref;
1236
1237         return 0;
1238
1239 unref:
1240         drm_dev_unref(drm);
1241         return err;
1242 }
1243
1244 static int host1x_drm_remove(struct host1x_device *dev)
1245 {
1246         struct drm_device *drm = dev_get_drvdata(&dev->dev);
1247
1248         drm_dev_unregister(drm);
1249         drm_dev_unref(drm);
1250
1251         return 0;
1252 }
1253
1254 #ifdef CONFIG_PM_SLEEP
1255 static int host1x_drm_suspend(struct device *dev)
1256 {
1257         struct drm_device *drm = dev_get_drvdata(dev);
1258         struct tegra_drm *tegra = drm->dev_private;
1259
1260         drm_kms_helper_poll_disable(drm);
1261         tegra_drm_fb_suspend(drm);
1262
1263         tegra->state = drm_atomic_helper_suspend(drm);
1264         if (IS_ERR(tegra->state)) {
1265                 tegra_drm_fb_resume(drm);
1266                 drm_kms_helper_poll_enable(drm);
1267                 return PTR_ERR(tegra->state);
1268         }
1269
1270         return 0;
1271 }
1272
1273 static int host1x_drm_resume(struct device *dev)
1274 {
1275         struct drm_device *drm = dev_get_drvdata(dev);
1276         struct tegra_drm *tegra = drm->dev_private;
1277
1278         drm_atomic_helper_resume(drm, tegra->state);
1279         tegra_drm_fb_resume(drm);
1280         drm_kms_helper_poll_enable(drm);
1281
1282         return 0;
1283 }
1284 #endif
1285
1286 static SIMPLE_DEV_PM_OPS(host1x_drm_pm_ops, host1x_drm_suspend,
1287                          host1x_drm_resume);
1288
1289 static const struct of_device_id host1x_drm_subdevs[] = {
1290         { .compatible = "nvidia,tegra20-dc", },
1291         { .compatible = "nvidia,tegra20-hdmi", },
1292         { .compatible = "nvidia,tegra20-gr2d", },
1293         { .compatible = "nvidia,tegra20-gr3d", },
1294         { .compatible = "nvidia,tegra30-dc", },
1295         { .compatible = "nvidia,tegra30-hdmi", },
1296         { .compatible = "nvidia,tegra30-gr2d", },
1297         { .compatible = "nvidia,tegra30-gr3d", },
1298         { .compatible = "nvidia,tegra114-dsi", },
1299         { .compatible = "nvidia,tegra114-hdmi", },
1300         { .compatible = "nvidia,tegra114-gr3d", },
1301         { .compatible = "nvidia,tegra124-dc", },
1302         { .compatible = "nvidia,tegra124-sor", },
1303         { .compatible = "nvidia,tegra124-hdmi", },
1304         { .compatible = "nvidia,tegra124-dsi", },
1305         { .compatible = "nvidia,tegra124-vic", },
1306         { .compatible = "nvidia,tegra132-dsi", },
1307         { .compatible = "nvidia,tegra210-dc", },
1308         { .compatible = "nvidia,tegra210-dsi", },
1309         { .compatible = "nvidia,tegra210-sor", },
1310         { .compatible = "nvidia,tegra210-sor1", },
1311         { .compatible = "nvidia,tegra210-vic", },
1312         { .compatible = "nvidia,tegra186-display", },
1313         { .compatible = "nvidia,tegra186-dc", },
1314         { .compatible = "nvidia,tegra186-sor", },
1315         { .compatible = "nvidia,tegra186-sor1", },
1316         { .compatible = "nvidia,tegra186-vic", },
1317         { /* sentinel */ }
1318 };
1319
1320 static struct host1x_driver host1x_drm_driver = {
1321         .driver = {
1322                 .name = "drm",
1323                 .pm = &host1x_drm_pm_ops,
1324         },
1325         .probe = host1x_drm_probe,
1326         .remove = host1x_drm_remove,
1327         .subdevs = host1x_drm_subdevs,
1328 };
1329
1330 static struct platform_driver * const drivers[] = {
1331         &tegra_display_hub_driver,
1332         &tegra_dc_driver,
1333         &tegra_hdmi_driver,
1334         &tegra_dsi_driver,
1335         &tegra_dpaux_driver,
1336         &tegra_sor_driver,
1337         &tegra_gr2d_driver,
1338         &tegra_gr3d_driver,
1339         &tegra_vic_driver,
1340 };
1341
1342 static int __init host1x_drm_init(void)
1343 {
1344         int err;
1345
1346         err = host1x_driver_register(&host1x_drm_driver);
1347         if (err < 0)
1348                 return err;
1349
1350         err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
1351         if (err < 0)
1352                 goto unregister_host1x;
1353
1354         return 0;
1355
1356 unregister_host1x:
1357         host1x_driver_unregister(&host1x_drm_driver);
1358         return err;
1359 }
1360 module_init(host1x_drm_init);
1361
1362 static void __exit host1x_drm_exit(void)
1363 {
1364         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
1365         host1x_driver_unregister(&host1x_drm_driver);
1366 }
1367 module_exit(host1x_drm_exit);
1368
1369 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
1370 MODULE_DESCRIPTION("NVIDIA Tegra DRM driver");
1371 MODULE_LICENSE("GPL v2");