1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Avionic Design GmbH 4 * Copyright (C) 2012-2016 NVIDIA CORPORATION. All rights reserved. 5 */ 6 7 #include <linux/bitops.h> 8 #include <linux/host1x.h> 9 #include <linux/idr.h> 10 #include <linux/iommu.h> 11 #include <linux/module.h> 12 #include <linux/platform_device.h> 13 14 #include <drm/drm_aperture.h> 15 #include <drm/drm_atomic.h> 16 #include <drm/drm_atomic_helper.h> 17 #include <drm/drm_debugfs.h> 18 #include <drm/drm_drv.h> 19 #include <drm/drm_fourcc.h> 20 #include <drm/drm_ioctl.h> 21 #include <drm/drm_prime.h> 22 #include <drm/drm_vblank.h> 23 24 #include "dc.h" 25 #include "drm.h" 26 #include "gem.h" 27 #include "uapi.h" 28 29 #define DRIVER_NAME "tegra" 30 #define DRIVER_DESC "NVIDIA Tegra graphics" 31 #define DRIVER_DATE "20120330" 32 #define DRIVER_MAJOR 1 33 #define DRIVER_MINOR 0 34 #define DRIVER_PATCHLEVEL 0 35 36 #define CARVEOUT_SZ SZ_64M 37 #define CDMA_GATHER_FETCHES_MAX_NB 16383 38 39 static int tegra_atomic_check(struct drm_device *drm, 40 struct drm_atomic_state *state) 41 { 42 int err; 43 44 err = drm_atomic_helper_check(drm, state); 45 if (err < 0) 46 return err; 47 48 return tegra_display_hub_atomic_check(drm, state); 49 } 50 51 static const struct drm_mode_config_funcs tegra_drm_mode_config_funcs = { 52 .fb_create = tegra_fb_create, 53 #ifdef CONFIG_DRM_FBDEV_EMULATION 54 .output_poll_changed = drm_fb_helper_output_poll_changed, 55 #endif 56 .atomic_check = tegra_atomic_check, 57 .atomic_commit = drm_atomic_helper_commit, 58 }; 59 60 static void tegra_atomic_post_commit(struct drm_device *drm, 61 struct drm_atomic_state *old_state) 62 { 63 struct drm_crtc_state *old_crtc_state __maybe_unused; 64 struct drm_crtc *crtc; 65 unsigned int i; 66 67 for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) 68 tegra_crtc_atomic_post_commit(crtc, old_state); 69 } 70 71 static void tegra_atomic_commit_tail(struct drm_atomic_state *old_state) 72 { 73 struct drm_device *drm = old_state->dev; 74 struct tegra_drm *tegra = drm->dev_private; 75 76 if (tegra->hub) { 77 bool fence_cookie = dma_fence_begin_signalling(); 78 79 drm_atomic_helper_commit_modeset_disables(drm, old_state); 80 tegra_display_hub_atomic_commit(drm, old_state); 81 drm_atomic_helper_commit_planes(drm, old_state, 0); 82 drm_atomic_helper_commit_modeset_enables(drm, old_state); 83 drm_atomic_helper_commit_hw_done(old_state); 84 dma_fence_end_signalling(fence_cookie); 85 drm_atomic_helper_wait_for_vblanks(drm, old_state); 86 drm_atomic_helper_cleanup_planes(drm, old_state); 87 } else { 88 drm_atomic_helper_commit_tail_rpm(old_state); 89 } 90 91 tegra_atomic_post_commit(drm, old_state); 92 } 93 94 static const struct drm_mode_config_helper_funcs 95 tegra_drm_mode_config_helpers = { 96 .atomic_commit_tail = tegra_atomic_commit_tail, 97 }; 98 99 static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp) 100 { 101 struct tegra_drm_file *fpriv; 102 103 fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL); 104 if (!fpriv) 105 return -ENOMEM; 106 107 idr_init_base(&fpriv->legacy_contexts, 1); 108 xa_init_flags(&fpriv->contexts, XA_FLAGS_ALLOC1); 109 xa_init(&fpriv->syncpoints); 110 mutex_init(&fpriv->lock); 111 filp->driver_priv = fpriv; 112 113 return 0; 114 } 115 116 static void tegra_drm_context_free(struct tegra_drm_context *context) 117 { 118 context->client->ops->close_channel(context); 119 kfree(context); 120 } 121 122 static int host1x_reloc_copy_from_user(struct host1x_reloc *dest, 123 struct drm_tegra_reloc __user *src, 124 struct drm_device *drm, 125 struct drm_file *file) 126 { 127 u32 cmdbuf, target; 128 int err; 129 130 err = get_user(cmdbuf, &src->cmdbuf.handle); 131 if (err < 0) 132 return err; 133 134 err = get_user(dest->cmdbuf.offset, &src->cmdbuf.offset); 135 if (err < 0) 136 return err; 137 138 err = get_user(target, &src->target.handle); 139 if (err < 0) 140 return err; 141 142 err = get_user(dest->target.offset, &src->target.offset); 143 if (err < 0) 144 return err; 145 146 err = get_user(dest->shift, &src->shift); 147 if (err < 0) 148 return err; 149 150 dest->flags = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE; 151 152 dest->cmdbuf.bo = tegra_gem_lookup(file, cmdbuf); 153 if (!dest->cmdbuf.bo) 154 return -ENOENT; 155 156 dest->target.bo = tegra_gem_lookup(file, target); 157 if (!dest->target.bo) 158 return -ENOENT; 159 160 return 0; 161 } 162 163 int tegra_drm_submit(struct tegra_drm_context *context, 164 struct drm_tegra_submit *args, struct drm_device *drm, 165 struct drm_file *file) 166 { 167 struct host1x_client *client = &context->client->base; 168 unsigned int num_cmdbufs = args->num_cmdbufs; 169 unsigned int num_relocs = args->num_relocs; 170 struct drm_tegra_cmdbuf __user *user_cmdbufs; 171 struct drm_tegra_reloc __user *user_relocs; 172 struct drm_tegra_syncpt __user *user_syncpt; 173 struct drm_tegra_syncpt syncpt; 174 struct host1x *host1x = dev_get_drvdata(drm->dev->parent); 175 struct drm_gem_object **refs; 176 struct host1x_syncpt *sp = NULL; 177 struct host1x_job *job; 178 unsigned int num_refs; 179 int err; 180 181 user_cmdbufs = u64_to_user_ptr(args->cmdbufs); 182 user_relocs = u64_to_user_ptr(args->relocs); 183 user_syncpt = u64_to_user_ptr(args->syncpts); 184 185 /* We don't yet support other than one syncpt_incr struct per submit */ 186 if (args->num_syncpts != 1) 187 return -EINVAL; 188 189 /* We don't yet support waitchks */ 190 if (args->num_waitchks != 0) 191 return -EINVAL; 192 193 job = host1x_job_alloc(context->channel, args->num_cmdbufs, 194 args->num_relocs, false); 195 if (!job) 196 return -ENOMEM; 197 198 job->num_relocs = args->num_relocs; 199 job->client = client; 200 job->class = client->class; 201 job->serialize = true; 202 job->syncpt_recovery = true; 203 204 /* 205 * Track referenced BOs so that they can be unreferenced after the 206 * submission is complete. 207 */ 208 num_refs = num_cmdbufs + num_relocs * 2; 209 210 refs = kmalloc_array(num_refs, sizeof(*refs), GFP_KERNEL); 211 if (!refs) { 212 err = -ENOMEM; 213 goto put; 214 } 215 216 /* reuse as an iterator later */ 217 num_refs = 0; 218 219 while (num_cmdbufs) { 220 struct drm_tegra_cmdbuf cmdbuf; 221 struct host1x_bo *bo; 222 struct tegra_bo *obj; 223 u64 offset; 224 225 if (copy_from_user(&cmdbuf, user_cmdbufs, sizeof(cmdbuf))) { 226 err = -EFAULT; 227 goto fail; 228 } 229 230 /* 231 * The maximum number of CDMA gather fetches is 16383, a higher 232 * value means the words count is malformed. 233 */ 234 if (cmdbuf.words > CDMA_GATHER_FETCHES_MAX_NB) { 235 err = -EINVAL; 236 goto fail; 237 } 238 239 bo = tegra_gem_lookup(file, cmdbuf.handle); 240 if (!bo) { 241 err = -ENOENT; 242 goto fail; 243 } 244 245 offset = (u64)cmdbuf.offset + (u64)cmdbuf.words * sizeof(u32); 246 obj = host1x_to_tegra_bo(bo); 247 refs[num_refs++] = &obj->gem; 248 249 /* 250 * Gather buffer base address must be 4-bytes aligned, 251 * unaligned offset is malformed and cause commands stream 252 * corruption on the buffer address relocation. 253 */ 254 if (offset & 3 || offset > obj->gem.size) { 255 err = -EINVAL; 256 goto fail; 257 } 258 259 host1x_job_add_gather(job, bo, cmdbuf.words, cmdbuf.offset); 260 num_cmdbufs--; 261 user_cmdbufs++; 262 } 263 264 /* copy and resolve relocations from submit */ 265 while (num_relocs--) { 266 struct host1x_reloc *reloc; 267 struct tegra_bo *obj; 268 269 err = host1x_reloc_copy_from_user(&job->relocs[num_relocs], 270 &user_relocs[num_relocs], drm, 271 file); 272 if (err < 0) 273 goto fail; 274 275 reloc = &job->relocs[num_relocs]; 276 obj = host1x_to_tegra_bo(reloc->cmdbuf.bo); 277 refs[num_refs++] = &obj->gem; 278 279 /* 280 * The unaligned cmdbuf offset will cause an unaligned write 281 * during of the relocations patching, corrupting the commands 282 * stream. 283 */ 284 if (reloc->cmdbuf.offset & 3 || 285 reloc->cmdbuf.offset >= obj->gem.size) { 286 err = -EINVAL; 287 goto fail; 288 } 289 290 obj = host1x_to_tegra_bo(reloc->target.bo); 291 refs[num_refs++] = &obj->gem; 292 293 if (reloc->target.offset >= obj->gem.size) { 294 err = -EINVAL; 295 goto fail; 296 } 297 } 298 299 if (copy_from_user(&syncpt, user_syncpt, sizeof(syncpt))) { 300 err = -EFAULT; 301 goto fail; 302 } 303 304 /* Syncpoint ref will be dropped on job release. */ 305 sp = host1x_syncpt_get_by_id(host1x, syncpt.id); 306 if (!sp) { 307 err = -ENOENT; 308 goto fail; 309 } 310 311 job->is_addr_reg = context->client->ops->is_addr_reg; 312 job->is_valid_class = context->client->ops->is_valid_class; 313 job->syncpt_incrs = syncpt.incrs; 314 job->syncpt = sp; 315 job->timeout = 10000; 316 317 if (args->timeout && args->timeout < 10000) 318 job->timeout = args->timeout; 319 320 err = host1x_job_pin(job, context->client->base.dev); 321 if (err) 322 goto fail; 323 324 err = host1x_job_submit(job); 325 if (err) { 326 host1x_job_unpin(job); 327 goto fail; 328 } 329 330 args->fence = job->syncpt_end; 331 332 fail: 333 while (num_refs--) 334 drm_gem_object_put(refs[num_refs]); 335 336 kfree(refs); 337 338 put: 339 host1x_job_put(job); 340 return err; 341 } 342 343 344 #ifdef CONFIG_DRM_TEGRA_STAGING 345 static int tegra_gem_create(struct drm_device *drm, void *data, 346 struct drm_file *file) 347 { 348 struct drm_tegra_gem_create *args = data; 349 struct tegra_bo *bo; 350 351 bo = tegra_bo_create_with_handle(file, drm, args->size, args->flags, 352 &args->handle); 353 if (IS_ERR(bo)) 354 return PTR_ERR(bo); 355 356 return 0; 357 } 358 359 static int tegra_gem_mmap(struct drm_device *drm, void *data, 360 struct drm_file *file) 361 { 362 struct drm_tegra_gem_mmap *args = data; 363 struct drm_gem_object *gem; 364 struct tegra_bo *bo; 365 366 gem = drm_gem_object_lookup(file, args->handle); 367 if (!gem) 368 return -EINVAL; 369 370 bo = to_tegra_bo(gem); 371 372 args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node); 373 374 drm_gem_object_put(gem); 375 376 return 0; 377 } 378 379 static int tegra_syncpt_read(struct drm_device *drm, void *data, 380 struct drm_file *file) 381 { 382 struct host1x *host = dev_get_drvdata(drm->dev->parent); 383 struct drm_tegra_syncpt_read *args = data; 384 struct host1x_syncpt *sp; 385 386 sp = host1x_syncpt_get_by_id_noref(host, args->id); 387 if (!sp) 388 return -EINVAL; 389 390 args->value = host1x_syncpt_read_min(sp); 391 return 0; 392 } 393 394 static int tegra_syncpt_incr(struct drm_device *drm, void *data, 395 struct drm_file *file) 396 { 397 struct host1x *host1x = dev_get_drvdata(drm->dev->parent); 398 struct drm_tegra_syncpt_incr *args = data; 399 struct host1x_syncpt *sp; 400 401 sp = host1x_syncpt_get_by_id_noref(host1x, args->id); 402 if (!sp) 403 return -EINVAL; 404 405 return host1x_syncpt_incr(sp); 406 } 407 408 static int tegra_syncpt_wait(struct drm_device *drm, void *data, 409 struct drm_file *file) 410 { 411 struct host1x *host1x = dev_get_drvdata(drm->dev->parent); 412 struct drm_tegra_syncpt_wait *args = data; 413 struct host1x_syncpt *sp; 414 415 sp = host1x_syncpt_get_by_id_noref(host1x, args->id); 416 if (!sp) 417 return -EINVAL; 418 419 return host1x_syncpt_wait(sp, args->thresh, 420 msecs_to_jiffies(args->timeout), 421 &args->value); 422 } 423 424 static int tegra_client_open(struct tegra_drm_file *fpriv, 425 struct tegra_drm_client *client, 426 struct tegra_drm_context *context) 427 { 428 int err; 429 430 err = client->ops->open_channel(client, context); 431 if (err < 0) 432 return err; 433 434 err = idr_alloc(&fpriv->legacy_contexts, context, 1, 0, GFP_KERNEL); 435 if (err < 0) { 436 client->ops->close_channel(context); 437 return err; 438 } 439 440 context->client = client; 441 context->id = err; 442 443 return 0; 444 } 445 446 static int tegra_open_channel(struct drm_device *drm, void *data, 447 struct drm_file *file) 448 { 449 struct tegra_drm_file *fpriv = file->driver_priv; 450 struct tegra_drm *tegra = drm->dev_private; 451 struct drm_tegra_open_channel *args = data; 452 struct tegra_drm_context *context; 453 struct tegra_drm_client *client; 454 int err = -ENODEV; 455 456 context = kzalloc(sizeof(*context), GFP_KERNEL); 457 if (!context) 458 return -ENOMEM; 459 460 mutex_lock(&fpriv->lock); 461 462 list_for_each_entry(client, &tegra->clients, list) 463 if (client->base.class == args->client) { 464 err = tegra_client_open(fpriv, client, context); 465 if (err < 0) 466 break; 467 468 args->context = context->id; 469 break; 470 } 471 472 if (err < 0) 473 kfree(context); 474 475 mutex_unlock(&fpriv->lock); 476 return err; 477 } 478 479 static int tegra_close_channel(struct drm_device *drm, void *data, 480 struct drm_file *file) 481 { 482 struct tegra_drm_file *fpriv = file->driver_priv; 483 struct drm_tegra_close_channel *args = data; 484 struct tegra_drm_context *context; 485 int err = 0; 486 487 mutex_lock(&fpriv->lock); 488 489 context = idr_find(&fpriv->legacy_contexts, args->context); 490 if (!context) { 491 err = -EINVAL; 492 goto unlock; 493 } 494 495 idr_remove(&fpriv->legacy_contexts, context->id); 496 tegra_drm_context_free(context); 497 498 unlock: 499 mutex_unlock(&fpriv->lock); 500 return err; 501 } 502 503 static int tegra_get_syncpt(struct drm_device *drm, void *data, 504 struct drm_file *file) 505 { 506 struct tegra_drm_file *fpriv = file->driver_priv; 507 struct drm_tegra_get_syncpt *args = data; 508 struct tegra_drm_context *context; 509 struct host1x_syncpt *syncpt; 510 int err = 0; 511 512 mutex_lock(&fpriv->lock); 513 514 context = idr_find(&fpriv->legacy_contexts, args->context); 515 if (!context) { 516 err = -ENODEV; 517 goto unlock; 518 } 519 520 if (args->index >= context->client->base.num_syncpts) { 521 err = -EINVAL; 522 goto unlock; 523 } 524 525 syncpt = context->client->base.syncpts[args->index]; 526 args->id = host1x_syncpt_id(syncpt); 527 528 unlock: 529 mutex_unlock(&fpriv->lock); 530 return err; 531 } 532 533 static int tegra_submit(struct drm_device *drm, void *data, 534 struct drm_file *file) 535 { 536 struct tegra_drm_file *fpriv = file->driver_priv; 537 struct drm_tegra_submit *args = data; 538 struct tegra_drm_context *context; 539 int err; 540 541 mutex_lock(&fpriv->lock); 542 543 context = idr_find(&fpriv->legacy_contexts, args->context); 544 if (!context) { 545 err = -ENODEV; 546 goto unlock; 547 } 548 549 err = context->client->ops->submit(context, args, drm, file); 550 551 unlock: 552 mutex_unlock(&fpriv->lock); 553 return err; 554 } 555 556 static int tegra_get_syncpt_base(struct drm_device *drm, void *data, 557 struct drm_file *file) 558 { 559 struct tegra_drm_file *fpriv = file->driver_priv; 560 struct drm_tegra_get_syncpt_base *args = data; 561 struct tegra_drm_context *context; 562 struct host1x_syncpt_base *base; 563 struct host1x_syncpt *syncpt; 564 int err = 0; 565 566 mutex_lock(&fpriv->lock); 567 568 context = idr_find(&fpriv->legacy_contexts, args->context); 569 if (!context) { 570 err = -ENODEV; 571 goto unlock; 572 } 573 574 if (args->syncpt >= context->client->base.num_syncpts) { 575 err = -EINVAL; 576 goto unlock; 577 } 578 579 syncpt = context->client->base.syncpts[args->syncpt]; 580 581 base = host1x_syncpt_get_base(syncpt); 582 if (!base) { 583 err = -ENXIO; 584 goto unlock; 585 } 586 587 args->id = host1x_syncpt_base_id(base); 588 589 unlock: 590 mutex_unlock(&fpriv->lock); 591 return err; 592 } 593 594 static int tegra_gem_set_tiling(struct drm_device *drm, void *data, 595 struct drm_file *file) 596 { 597 struct drm_tegra_gem_set_tiling *args = data; 598 enum tegra_bo_tiling_mode mode; 599 struct drm_gem_object *gem; 600 unsigned long value = 0; 601 struct tegra_bo *bo; 602 603 switch (args->mode) { 604 case DRM_TEGRA_GEM_TILING_MODE_PITCH: 605 mode = TEGRA_BO_TILING_MODE_PITCH; 606 607 if (args->value != 0) 608 return -EINVAL; 609 610 break; 611 612 case DRM_TEGRA_GEM_TILING_MODE_TILED: 613 mode = TEGRA_BO_TILING_MODE_TILED; 614 615 if (args->value != 0) 616 return -EINVAL; 617 618 break; 619 620 case DRM_TEGRA_GEM_TILING_MODE_BLOCK: 621 mode = TEGRA_BO_TILING_MODE_BLOCK; 622 623 if (args->value > 5) 624 return -EINVAL; 625 626 value = args->value; 627 break; 628 629 default: 630 return -EINVAL; 631 } 632 633 gem = drm_gem_object_lookup(file, args->handle); 634 if (!gem) 635 return -ENOENT; 636 637 bo = to_tegra_bo(gem); 638 639 bo->tiling.mode = mode; 640 bo->tiling.value = value; 641 642 drm_gem_object_put(gem); 643 644 return 0; 645 } 646 647 static int tegra_gem_get_tiling(struct drm_device *drm, void *data, 648 struct drm_file *file) 649 { 650 struct drm_tegra_gem_get_tiling *args = data; 651 struct drm_gem_object *gem; 652 struct tegra_bo *bo; 653 int err = 0; 654 655 gem = drm_gem_object_lookup(file, args->handle); 656 if (!gem) 657 return -ENOENT; 658 659 bo = to_tegra_bo(gem); 660 661 switch (bo->tiling.mode) { 662 case TEGRA_BO_TILING_MODE_PITCH: 663 args->mode = DRM_TEGRA_GEM_TILING_MODE_PITCH; 664 args->value = 0; 665 break; 666 667 case TEGRA_BO_TILING_MODE_TILED: 668 args->mode = DRM_TEGRA_GEM_TILING_MODE_TILED; 669 args->value = 0; 670 break; 671 672 case TEGRA_BO_TILING_MODE_BLOCK: 673 args->mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK; 674 args->value = bo->tiling.value; 675 break; 676 677 default: 678 err = -EINVAL; 679 break; 680 } 681 682 drm_gem_object_put(gem); 683 684 return err; 685 } 686 687 static int tegra_gem_set_flags(struct drm_device *drm, void *data, 688 struct drm_file *file) 689 { 690 struct drm_tegra_gem_set_flags *args = data; 691 struct drm_gem_object *gem; 692 struct tegra_bo *bo; 693 694 if (args->flags & ~DRM_TEGRA_GEM_FLAGS) 695 return -EINVAL; 696 697 gem = drm_gem_object_lookup(file, args->handle); 698 if (!gem) 699 return -ENOENT; 700 701 bo = to_tegra_bo(gem); 702 bo->flags = 0; 703 704 if (args->flags & DRM_TEGRA_GEM_BOTTOM_UP) 705 bo->flags |= TEGRA_BO_BOTTOM_UP; 706 707 drm_gem_object_put(gem); 708 709 return 0; 710 } 711 712 static int tegra_gem_get_flags(struct drm_device *drm, void *data, 713 struct drm_file *file) 714 { 715 struct drm_tegra_gem_get_flags *args = data; 716 struct drm_gem_object *gem; 717 struct tegra_bo *bo; 718 719 gem = drm_gem_object_lookup(file, args->handle); 720 if (!gem) 721 return -ENOENT; 722 723 bo = to_tegra_bo(gem); 724 args->flags = 0; 725 726 if (bo->flags & TEGRA_BO_BOTTOM_UP) 727 args->flags |= DRM_TEGRA_GEM_BOTTOM_UP; 728 729 drm_gem_object_put(gem); 730 731 return 0; 732 } 733 #endif 734 735 static const struct drm_ioctl_desc tegra_drm_ioctls[] = { 736 #ifdef CONFIG_DRM_TEGRA_STAGING 737 DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_OPEN, tegra_drm_ioctl_channel_open, 738 DRM_RENDER_ALLOW), 739 DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_CLOSE, tegra_drm_ioctl_channel_close, 740 DRM_RENDER_ALLOW), 741 DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_MAP, tegra_drm_ioctl_channel_map, 742 DRM_RENDER_ALLOW), 743 DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_UNMAP, tegra_drm_ioctl_channel_unmap, 744 DRM_RENDER_ALLOW), 745 DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_SUBMIT, tegra_drm_ioctl_channel_submit, 746 DRM_RENDER_ALLOW), 747 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPOINT_ALLOCATE, tegra_drm_ioctl_syncpoint_allocate, 748 DRM_RENDER_ALLOW), 749 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPOINT_FREE, tegra_drm_ioctl_syncpoint_free, 750 DRM_RENDER_ALLOW), 751 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPOINT_WAIT, tegra_drm_ioctl_syncpoint_wait, 752 DRM_RENDER_ALLOW), 753 754 DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create, DRM_RENDER_ALLOW), 755 DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap, DRM_RENDER_ALLOW), 756 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read, 757 DRM_RENDER_ALLOW), 758 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr, 759 DRM_RENDER_ALLOW), 760 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait, 761 DRM_RENDER_ALLOW), 762 DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel, 763 DRM_RENDER_ALLOW), 764 DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel, 765 DRM_RENDER_ALLOW), 766 DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt, 767 DRM_RENDER_ALLOW), 768 DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit, 769 DRM_RENDER_ALLOW), 770 DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT_BASE, tegra_get_syncpt_base, 771 DRM_RENDER_ALLOW), 772 DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_TILING, tegra_gem_set_tiling, 773 DRM_RENDER_ALLOW), 774 DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_TILING, tegra_gem_get_tiling, 775 DRM_RENDER_ALLOW), 776 DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_FLAGS, tegra_gem_set_flags, 777 DRM_RENDER_ALLOW), 778 DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_FLAGS, tegra_gem_get_flags, 779 DRM_RENDER_ALLOW), 780 #endif 781 }; 782 783 static const struct file_operations tegra_drm_fops = { 784 .owner = THIS_MODULE, 785 .open = drm_open, 786 .release = drm_release, 787 .unlocked_ioctl = drm_ioctl, 788 .mmap = tegra_drm_mmap, 789 .poll = drm_poll, 790 .read = drm_read, 791 .compat_ioctl = drm_compat_ioctl, 792 .llseek = noop_llseek, 793 }; 794 795 static int tegra_drm_context_cleanup(int id, void *p, void *data) 796 { 797 struct tegra_drm_context *context = p; 798 799 tegra_drm_context_free(context); 800 801 return 0; 802 } 803 804 static void tegra_drm_postclose(struct drm_device *drm, struct drm_file *file) 805 { 806 struct tegra_drm_file *fpriv = file->driver_priv; 807 808 mutex_lock(&fpriv->lock); 809 idr_for_each(&fpriv->legacy_contexts, tegra_drm_context_cleanup, NULL); 810 tegra_drm_uapi_close_file(fpriv); 811 mutex_unlock(&fpriv->lock); 812 813 idr_destroy(&fpriv->legacy_contexts); 814 mutex_destroy(&fpriv->lock); 815 kfree(fpriv); 816 } 817 818 #ifdef CONFIG_DEBUG_FS 819 static int tegra_debugfs_framebuffers(struct seq_file *s, void *data) 820 { 821 struct drm_info_node *node = (struct drm_info_node *)s->private; 822 struct drm_device *drm = node->minor->dev; 823 struct drm_framebuffer *fb; 824 825 mutex_lock(&drm->mode_config.fb_lock); 826 827 list_for_each_entry(fb, &drm->mode_config.fb_list, head) { 828 seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n", 829 fb->base.id, fb->width, fb->height, 830 fb->format->depth, 831 fb->format->cpp[0] * 8, 832 drm_framebuffer_read_refcount(fb)); 833 } 834 835 mutex_unlock(&drm->mode_config.fb_lock); 836 837 return 0; 838 } 839 840 static int tegra_debugfs_iova(struct seq_file *s, void *data) 841 { 842 struct drm_info_node *node = (struct drm_info_node *)s->private; 843 struct drm_device *drm = node->minor->dev; 844 struct tegra_drm *tegra = drm->dev_private; 845 struct drm_printer p = drm_seq_file_printer(s); 846 847 if (tegra->domain) { 848 mutex_lock(&tegra->mm_lock); 849 drm_mm_print(&tegra->mm, &p); 850 mutex_unlock(&tegra->mm_lock); 851 } 852 853 return 0; 854 } 855 856 static struct drm_info_list tegra_debugfs_list[] = { 857 { "framebuffers", tegra_debugfs_framebuffers, 0 }, 858 { "iova", tegra_debugfs_iova, 0 }, 859 }; 860 861 static void tegra_debugfs_init(struct drm_minor *minor) 862 { 863 drm_debugfs_create_files(tegra_debugfs_list, 864 ARRAY_SIZE(tegra_debugfs_list), 865 minor->debugfs_root, minor); 866 } 867 #endif 868 869 static const struct drm_driver tegra_drm_driver = { 870 .driver_features = DRIVER_MODESET | DRIVER_GEM | 871 DRIVER_ATOMIC | DRIVER_RENDER | DRIVER_SYNCOBJ, 872 .open = tegra_drm_open, 873 .postclose = tegra_drm_postclose, 874 .lastclose = drm_fb_helper_lastclose, 875 876 #if defined(CONFIG_DEBUG_FS) 877 .debugfs_init = tegra_debugfs_init, 878 #endif 879 880 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 881 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 882 .gem_prime_import = tegra_gem_prime_import, 883 884 .dumb_create = tegra_bo_dumb_create, 885 886 .ioctls = tegra_drm_ioctls, 887 .num_ioctls = ARRAY_SIZE(tegra_drm_ioctls), 888 .fops = &tegra_drm_fops, 889 890 .name = DRIVER_NAME, 891 .desc = DRIVER_DESC, 892 .date = DRIVER_DATE, 893 .major = DRIVER_MAJOR, 894 .minor = DRIVER_MINOR, 895 .patchlevel = DRIVER_PATCHLEVEL, 896 }; 897 898 int tegra_drm_register_client(struct tegra_drm *tegra, 899 struct tegra_drm_client *client) 900 { 901 /* 902 * When MLOCKs are implemented, change to allocate a shared channel 903 * only when MLOCKs are disabled. 904 */ 905 client->shared_channel = host1x_channel_request(&client->base); 906 if (!client->shared_channel) 907 return -EBUSY; 908 909 mutex_lock(&tegra->clients_lock); 910 list_add_tail(&client->list, &tegra->clients); 911 client->drm = tegra; 912 mutex_unlock(&tegra->clients_lock); 913 914 return 0; 915 } 916 917 int tegra_drm_unregister_client(struct tegra_drm *tegra, 918 struct tegra_drm_client *client) 919 { 920 mutex_lock(&tegra->clients_lock); 921 list_del_init(&client->list); 922 client->drm = NULL; 923 mutex_unlock(&tegra->clients_lock); 924 925 if (client->shared_channel) 926 host1x_channel_put(client->shared_channel); 927 928 return 0; 929 } 930 931 int host1x_client_iommu_attach(struct host1x_client *client) 932 { 933 struct iommu_domain *domain = iommu_get_domain_for_dev(client->dev); 934 struct drm_device *drm = dev_get_drvdata(client->host); 935 struct tegra_drm *tegra = drm->dev_private; 936 struct iommu_group *group = NULL; 937 int err; 938 939 /* 940 * If the host1x client is already attached to an IOMMU domain that is 941 * not the shared IOMMU domain, don't try to attach it to a different 942 * domain. This allows using the IOMMU-backed DMA API. 943 */ 944 if (domain && domain != tegra->domain) 945 return 0; 946 947 if (tegra->domain) { 948 group = iommu_group_get(client->dev); 949 if (!group) 950 return -ENODEV; 951 952 if (domain != tegra->domain) { 953 err = iommu_attach_group(tegra->domain, group); 954 if (err < 0) { 955 iommu_group_put(group); 956 return err; 957 } 958 } 959 960 tegra->use_explicit_iommu = true; 961 } 962 963 client->group = group; 964 965 return 0; 966 } 967 968 void host1x_client_iommu_detach(struct host1x_client *client) 969 { 970 struct drm_device *drm = dev_get_drvdata(client->host); 971 struct tegra_drm *tegra = drm->dev_private; 972 struct iommu_domain *domain; 973 974 if (client->group) { 975 /* 976 * Devices that are part of the same group may no longer be 977 * attached to a domain at this point because their group may 978 * have been detached by an earlier client. 979 */ 980 domain = iommu_get_domain_for_dev(client->dev); 981 if (domain) 982 iommu_detach_group(tegra->domain, client->group); 983 984 iommu_group_put(client->group); 985 client->group = NULL; 986 } 987 } 988 989 void *tegra_drm_alloc(struct tegra_drm *tegra, size_t size, dma_addr_t *dma) 990 { 991 struct iova *alloc; 992 void *virt; 993 gfp_t gfp; 994 int err; 995 996 if (tegra->domain) 997 size = iova_align(&tegra->carveout.domain, size); 998 else 999 size = PAGE_ALIGN(size); 1000 1001 gfp = GFP_KERNEL | __GFP_ZERO; 1002 if (!tegra->domain) { 1003 /* 1004 * Many units only support 32-bit addresses, even on 64-bit 1005 * SoCs. If there is no IOMMU to translate into a 32-bit IO 1006 * virtual address space, force allocations to be in the 1007 * lower 32-bit range. 1008 */ 1009 gfp |= GFP_DMA; 1010 } 1011 1012 virt = (void *)__get_free_pages(gfp, get_order(size)); 1013 if (!virt) 1014 return ERR_PTR(-ENOMEM); 1015 1016 if (!tegra->domain) { 1017 /* 1018 * If IOMMU is disabled, devices address physical memory 1019 * directly. 1020 */ 1021 *dma = virt_to_phys(virt); 1022 return virt; 1023 } 1024 1025 alloc = alloc_iova(&tegra->carveout.domain, 1026 size >> tegra->carveout.shift, 1027 tegra->carveout.limit, true); 1028 if (!alloc) { 1029 err = -EBUSY; 1030 goto free_pages; 1031 } 1032 1033 *dma = iova_dma_addr(&tegra->carveout.domain, alloc); 1034 err = iommu_map(tegra->domain, *dma, virt_to_phys(virt), 1035 size, IOMMU_READ | IOMMU_WRITE); 1036 if (err < 0) 1037 goto free_iova; 1038 1039 return virt; 1040 1041 free_iova: 1042 __free_iova(&tegra->carveout.domain, alloc); 1043 free_pages: 1044 free_pages((unsigned long)virt, get_order(size)); 1045 1046 return ERR_PTR(err); 1047 } 1048 1049 void tegra_drm_free(struct tegra_drm *tegra, size_t size, void *virt, 1050 dma_addr_t dma) 1051 { 1052 if (tegra->domain) 1053 size = iova_align(&tegra->carveout.domain, size); 1054 else 1055 size = PAGE_ALIGN(size); 1056 1057 if (tegra->domain) { 1058 iommu_unmap(tegra->domain, dma, size); 1059 free_iova(&tegra->carveout.domain, 1060 iova_pfn(&tegra->carveout.domain, dma)); 1061 } 1062 1063 free_pages((unsigned long)virt, get_order(size)); 1064 } 1065 1066 static bool host1x_drm_wants_iommu(struct host1x_device *dev) 1067 { 1068 struct host1x *host1x = dev_get_drvdata(dev->dev.parent); 1069 struct iommu_domain *domain; 1070 1071 /* 1072 * If the Tegra DRM clients are backed by an IOMMU, push buffers are 1073 * likely to be allocated beyond the 32-bit boundary if sufficient 1074 * system memory is available. This is problematic on earlier Tegra 1075 * generations where host1x supports a maximum of 32 address bits in 1076 * the GATHER opcode. In this case, unless host1x is behind an IOMMU 1077 * as well it won't be able to process buffers allocated beyond the 1078 * 32-bit boundary. 1079 * 1080 * The DMA API will use bounce buffers in this case, so that could 1081 * perhaps still be made to work, even if less efficient, but there 1082 * is another catch: in order to perform cache maintenance on pages 1083 * allocated for discontiguous buffers we need to map and unmap the 1084 * SG table representing these buffers. This is fine for something 1085 * small like a push buffer, but it exhausts the bounce buffer pool 1086 * (typically on the order of a few MiB) for framebuffers (many MiB 1087 * for any modern resolution). 1088 * 1089 * Work around this by making sure that Tegra DRM clients only use 1090 * an IOMMU if the parent host1x also uses an IOMMU. 1091 * 1092 * Note that there's still a small gap here that we don't cover: if 1093 * the DMA API is backed by an IOMMU there's no way to control which 1094 * device is attached to an IOMMU and which isn't, except via wiring 1095 * up the device tree appropriately. This is considered an problem 1096 * of integration, so care must be taken for the DT to be consistent. 1097 */ 1098 domain = iommu_get_domain_for_dev(dev->dev.parent); 1099 1100 /* 1101 * Tegra20 and Tegra30 don't support addressing memory beyond the 1102 * 32-bit boundary, so the regular GATHER opcodes will always be 1103 * sufficient and whether or not the host1x is attached to an IOMMU 1104 * doesn't matter. 1105 */ 1106 if (!domain && host1x_get_dma_mask(host1x) <= DMA_BIT_MASK(32)) 1107 return true; 1108 1109 return domain != NULL; 1110 } 1111 1112 static int host1x_drm_probe(struct host1x_device *dev) 1113 { 1114 struct tegra_drm *tegra; 1115 struct drm_device *drm; 1116 int err; 1117 1118 drm = drm_dev_alloc(&tegra_drm_driver, &dev->dev); 1119 if (IS_ERR(drm)) 1120 return PTR_ERR(drm); 1121 1122 tegra = kzalloc(sizeof(*tegra), GFP_KERNEL); 1123 if (!tegra) { 1124 err = -ENOMEM; 1125 goto put; 1126 } 1127 1128 if (host1x_drm_wants_iommu(dev) && iommu_present(&platform_bus_type)) { 1129 tegra->domain = iommu_domain_alloc(&platform_bus_type); 1130 if (!tegra->domain) { 1131 err = -ENOMEM; 1132 goto free; 1133 } 1134 1135 err = iova_cache_get(); 1136 if (err < 0) 1137 goto domain; 1138 } 1139 1140 mutex_init(&tegra->clients_lock); 1141 INIT_LIST_HEAD(&tegra->clients); 1142 1143 dev_set_drvdata(&dev->dev, drm); 1144 drm->dev_private = tegra; 1145 tegra->drm = drm; 1146 1147 drm_mode_config_init(drm); 1148 1149 drm->mode_config.min_width = 0; 1150 drm->mode_config.min_height = 0; 1151 drm->mode_config.max_width = 0; 1152 drm->mode_config.max_height = 0; 1153 1154 drm->mode_config.normalize_zpos = true; 1155 1156 drm->mode_config.funcs = &tegra_drm_mode_config_funcs; 1157 drm->mode_config.helper_private = &tegra_drm_mode_config_helpers; 1158 1159 err = tegra_drm_fb_prepare(drm); 1160 if (err < 0) 1161 goto config; 1162 1163 drm_kms_helper_poll_init(drm); 1164 1165 err = host1x_device_init(dev); 1166 if (err < 0) 1167 goto fbdev; 1168 1169 /* 1170 * Now that all display controller have been initialized, the maximum 1171 * supported resolution is known and the bitmask for horizontal and 1172 * vertical bitfields can be computed. 1173 */ 1174 tegra->hmask = drm->mode_config.max_width - 1; 1175 tegra->vmask = drm->mode_config.max_height - 1; 1176 1177 if (tegra->use_explicit_iommu) { 1178 u64 carveout_start, carveout_end, gem_start, gem_end; 1179 u64 dma_mask = dma_get_mask(&dev->dev); 1180 dma_addr_t start, end; 1181 unsigned long order; 1182 1183 start = tegra->domain->geometry.aperture_start & dma_mask; 1184 end = tegra->domain->geometry.aperture_end & dma_mask; 1185 1186 gem_start = start; 1187 gem_end = end - CARVEOUT_SZ; 1188 carveout_start = gem_end + 1; 1189 carveout_end = end; 1190 1191 order = __ffs(tegra->domain->pgsize_bitmap); 1192 init_iova_domain(&tegra->carveout.domain, 1UL << order, 1193 carveout_start >> order); 1194 1195 tegra->carveout.shift = iova_shift(&tegra->carveout.domain); 1196 tegra->carveout.limit = carveout_end >> tegra->carveout.shift; 1197 1198 drm_mm_init(&tegra->mm, gem_start, gem_end - gem_start + 1); 1199 mutex_init(&tegra->mm_lock); 1200 1201 DRM_DEBUG_DRIVER("IOMMU apertures:\n"); 1202 DRM_DEBUG_DRIVER(" GEM: %#llx-%#llx\n", gem_start, gem_end); 1203 DRM_DEBUG_DRIVER(" Carveout: %#llx-%#llx\n", carveout_start, 1204 carveout_end); 1205 } else if (tegra->domain) { 1206 iommu_domain_free(tegra->domain); 1207 tegra->domain = NULL; 1208 iova_cache_put(); 1209 } 1210 1211 if (tegra->hub) { 1212 err = tegra_display_hub_prepare(tegra->hub); 1213 if (err < 0) 1214 goto device; 1215 } 1216 1217 /* syncpoints are used for full 32-bit hardware VBLANK counters */ 1218 drm->max_vblank_count = 0xffffffff; 1219 1220 err = drm_vblank_init(drm, drm->mode_config.num_crtc); 1221 if (err < 0) 1222 goto hub; 1223 1224 drm_mode_config_reset(drm); 1225 1226 err = drm_aperture_remove_framebuffers(false, &tegra_drm_driver); 1227 if (err < 0) 1228 goto hub; 1229 1230 err = tegra_drm_fb_init(drm); 1231 if (err < 0) 1232 goto hub; 1233 1234 err = drm_dev_register(drm, 0); 1235 if (err < 0) 1236 goto fb; 1237 1238 return 0; 1239 1240 fb: 1241 tegra_drm_fb_exit(drm); 1242 hub: 1243 if (tegra->hub) 1244 tegra_display_hub_cleanup(tegra->hub); 1245 device: 1246 if (tegra->domain) { 1247 mutex_destroy(&tegra->mm_lock); 1248 drm_mm_takedown(&tegra->mm); 1249 put_iova_domain(&tegra->carveout.domain); 1250 iova_cache_put(); 1251 } 1252 1253 host1x_device_exit(dev); 1254 fbdev: 1255 drm_kms_helper_poll_fini(drm); 1256 tegra_drm_fb_free(drm); 1257 config: 1258 drm_mode_config_cleanup(drm); 1259 domain: 1260 if (tegra->domain) 1261 iommu_domain_free(tegra->domain); 1262 free: 1263 kfree(tegra); 1264 put: 1265 drm_dev_put(drm); 1266 return err; 1267 } 1268 1269 static int host1x_drm_remove(struct host1x_device *dev) 1270 { 1271 struct drm_device *drm = dev_get_drvdata(&dev->dev); 1272 struct tegra_drm *tegra = drm->dev_private; 1273 int err; 1274 1275 drm_dev_unregister(drm); 1276 1277 drm_kms_helper_poll_fini(drm); 1278 tegra_drm_fb_exit(drm); 1279 drm_atomic_helper_shutdown(drm); 1280 drm_mode_config_cleanup(drm); 1281 1282 if (tegra->hub) 1283 tegra_display_hub_cleanup(tegra->hub); 1284 1285 err = host1x_device_exit(dev); 1286 if (err < 0) 1287 dev_err(&dev->dev, "host1x device cleanup failed: %d\n", err); 1288 1289 if (tegra->domain) { 1290 mutex_destroy(&tegra->mm_lock); 1291 drm_mm_takedown(&tegra->mm); 1292 put_iova_domain(&tegra->carveout.domain); 1293 iova_cache_put(); 1294 iommu_domain_free(tegra->domain); 1295 } 1296 1297 kfree(tegra); 1298 drm_dev_put(drm); 1299 1300 return 0; 1301 } 1302 1303 #ifdef CONFIG_PM_SLEEP 1304 static int host1x_drm_suspend(struct device *dev) 1305 { 1306 struct drm_device *drm = dev_get_drvdata(dev); 1307 1308 return drm_mode_config_helper_suspend(drm); 1309 } 1310 1311 static int host1x_drm_resume(struct device *dev) 1312 { 1313 struct drm_device *drm = dev_get_drvdata(dev); 1314 1315 return drm_mode_config_helper_resume(drm); 1316 } 1317 #endif 1318 1319 static SIMPLE_DEV_PM_OPS(host1x_drm_pm_ops, host1x_drm_suspend, 1320 host1x_drm_resume); 1321 1322 static const struct of_device_id host1x_drm_subdevs[] = { 1323 { .compatible = "nvidia,tegra20-dc", }, 1324 { .compatible = "nvidia,tegra20-hdmi", }, 1325 { .compatible = "nvidia,tegra20-gr2d", }, 1326 { .compatible = "nvidia,tegra20-gr3d", }, 1327 { .compatible = "nvidia,tegra30-dc", }, 1328 { .compatible = "nvidia,tegra30-hdmi", }, 1329 { .compatible = "nvidia,tegra30-gr2d", }, 1330 { .compatible = "nvidia,tegra30-gr3d", }, 1331 { .compatible = "nvidia,tegra114-dc", }, 1332 { .compatible = "nvidia,tegra114-dsi", }, 1333 { .compatible = "nvidia,tegra114-hdmi", }, 1334 { .compatible = "nvidia,tegra114-gr2d", }, 1335 { .compatible = "nvidia,tegra114-gr3d", }, 1336 { .compatible = "nvidia,tegra124-dc", }, 1337 { .compatible = "nvidia,tegra124-sor", }, 1338 { .compatible = "nvidia,tegra124-hdmi", }, 1339 { .compatible = "nvidia,tegra124-dsi", }, 1340 { .compatible = "nvidia,tegra124-vic", }, 1341 { .compatible = "nvidia,tegra132-dsi", }, 1342 { .compatible = "nvidia,tegra210-dc", }, 1343 { .compatible = "nvidia,tegra210-dsi", }, 1344 { .compatible = "nvidia,tegra210-sor", }, 1345 { .compatible = "nvidia,tegra210-sor1", }, 1346 { .compatible = "nvidia,tegra210-vic", }, 1347 { .compatible = "nvidia,tegra186-display", }, 1348 { .compatible = "nvidia,tegra186-dc", }, 1349 { .compatible = "nvidia,tegra186-sor", }, 1350 { .compatible = "nvidia,tegra186-sor1", }, 1351 { .compatible = "nvidia,tegra186-vic", }, 1352 { .compatible = "nvidia,tegra194-display", }, 1353 { .compatible = "nvidia,tegra194-dc", }, 1354 { .compatible = "nvidia,tegra194-sor", }, 1355 { .compatible = "nvidia,tegra194-vic", }, 1356 { /* sentinel */ } 1357 }; 1358 1359 static struct host1x_driver host1x_drm_driver = { 1360 .driver = { 1361 .name = "drm", 1362 .pm = &host1x_drm_pm_ops, 1363 }, 1364 .probe = host1x_drm_probe, 1365 .remove = host1x_drm_remove, 1366 .subdevs = host1x_drm_subdevs, 1367 }; 1368 1369 static struct platform_driver * const drivers[] = { 1370 &tegra_display_hub_driver, 1371 &tegra_dc_driver, 1372 &tegra_hdmi_driver, 1373 &tegra_dsi_driver, 1374 &tegra_dpaux_driver, 1375 &tegra_sor_driver, 1376 &tegra_gr2d_driver, 1377 &tegra_gr3d_driver, 1378 &tegra_vic_driver, 1379 }; 1380 1381 static int __init host1x_drm_init(void) 1382 { 1383 int err; 1384 1385 err = host1x_driver_register(&host1x_drm_driver); 1386 if (err < 0) 1387 return err; 1388 1389 err = platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 1390 if (err < 0) 1391 goto unregister_host1x; 1392 1393 return 0; 1394 1395 unregister_host1x: 1396 host1x_driver_unregister(&host1x_drm_driver); 1397 return err; 1398 } 1399 module_init(host1x_drm_init); 1400 1401 static void __exit host1x_drm_exit(void) 1402 { 1403 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 1404 host1x_driver_unregister(&host1x_drm_driver); 1405 } 1406 module_exit(host1x_drm_exit); 1407 1408 MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>"); 1409 MODULE_DESCRIPTION("NVIDIA Tegra DRM driver"); 1410 MODULE_LICENSE("GPL v2"); 1411