drivers/gpu/host1x/drm/drm.c

   1 /*
   2  * Copyright (C) 2012 Avionic Design GmbH
   3  * Copyright (C) 2012-2013 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 "host1x_client.h"
  11 #include "drm.h"
  12 #include "gem.h"
  13
  14 #define DRIVER_NAME "tegra"
  15 #define DRIVER_DESC "NVIDIA Tegra graphics"
  16 #define DRIVER_DATE "20120330"
  17 #define DRIVER_MAJOR 0
  18 #define DRIVER_MINOR 0
  19 #define DRIVER_PATCHLEVEL 0
  20
  21 struct tegra_drm_file {
  22         struct list_head contexts;
  23 };
  24
  25 struct host1x_subdev {
  26         struct host1x_client *client;
  27         struct device_node *np;
  28         struct list_head list;
  29 };
  30
  31 static int host1x_subdev_add(struct tegra_drm *tegra, struct device_node *np)
  32 {
  33         struct host1x_subdev *subdev;
  34
  35         subdev = kzalloc(sizeof(*subdev), GFP_KERNEL);
  36         if (!subdev)
  37                 return -ENOMEM;
  38
  39         INIT_LIST_HEAD(&subdev->list);
  40         subdev->np = of_node_get(np);
  41
  42         list_add_tail(&subdev->list, &tegra->subdevs);
  43
  44         return 0;
  45 }
  46
  47 static int host1x_subdev_register(struct tegra_drm *tegra,
  48                                   struct host1x_subdev *subdev,
  49                                   struct host1x_client *client)
  50 {
  51         mutex_lock(&tegra->subdevs_lock);
  52         list_del_init(&subdev->list);
  53         list_add_tail(&subdev->list, &tegra->active);
  54         subdev->client = client;
  55         mutex_unlock(&tegra->subdevs_lock);
  56
  57         return 0;
  58 }
  59
  60 static int host1x_subdev_unregister(struct tegra_drm *tegra,
  61                                     struct host1x_subdev *subdev)
  62 {
  63         mutex_lock(&tegra->subdevs_lock);
  64         list_del_init(&subdev->list);
  65         mutex_unlock(&tegra->subdevs_lock);
  66
  67         of_node_put(subdev->np);
  68         kfree(subdev);
  69
  70         return 0;
  71 }
  72
  73 static int tegra_parse_dt(struct tegra_drm *tegra)
  74 {
  75         static const char * const compat[] = {
  76                 "nvidia,tegra20-dc",
  77                 "nvidia,tegra20-hdmi",
  78                 "nvidia,tegra20-gr2d",
  79                 "nvidia,tegra30-dc",
  80                 "nvidia,tegra30-hdmi",
  81                 "nvidia,tegra30-gr2d",
  82         };
  83         unsigned int i;
  84         int err;
  85
  86         for (i = 0; i < ARRAY_SIZE(compat); i++) {
  87                 struct device_node *np;
  88
  89                 for_each_child_of_node(tegra->dev->of_node, np) {
  90                         if (of_device_is_compatible(np, compat[i]) &&
  91                             of_device_is_available(np)) {
  92                                 err = host1x_subdev_add(tegra, np);
  93                                 if (err < 0)
  94                                         return err;
  95                         }
  96                 }
  97         }
  98
  99         return 0;
 100 }
 101
 102 int tegra_drm_alloc(struct platform_device *pdev)
 103 {
 104         struct tegra_drm *tegra;
 105         int err;
 106
 107         tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
 108         if (!tegra)
 109                 return -ENOMEM;
 110
 111         mutex_init(&tegra->subdevs_lock);
 112         INIT_LIST_HEAD(&tegra->subdevs);
 113         INIT_LIST_HEAD(&tegra->active);
 114         mutex_init(&tegra->clients_lock);
 115         INIT_LIST_HEAD(&tegra->clients);
 116         tegra->dev = &pdev->dev;
 117
 118         err = tegra_parse_dt(tegra);
 119         if (err < 0) {
 120                 dev_err(&pdev->dev, "failed to parse DT: %d\n", err);
 121                 return err;
 122         }
 123
 124         host1x_set_drm_data(&pdev->dev, tegra);
 125
 126         return 0;
 127 }
 128
 129 int tegra_drm_init(struct tegra_drm *tegra, struct drm_device *drm)
 130 {
 131         struct host1x_client *client;
 132         int err;
 133
 134         mutex_lock(&tegra->clients_lock);
 135
 136         list_for_each_entry(client, &tegra->clients, list) {
 137                 struct tegra_drm_client *tdc = to_tegra_drm_client(client);
 138
 139                 /* associate client with DRM device */
 140                 tdc->drm = drm;
 141
 142                 if (client->ops && client->ops->init) {
 143                         err = client->ops->init(client);
 144                         if (err < 0) {
 145                                 dev_err(tegra->dev,
 146                                         "DRM setup failed for %s: %d\n",
 147                                         dev_name(client->dev), err);
 148                                 mutex_unlock(&tegra->clients_lock);
 149                                 return err;
 150                         }
 151                 }
 152         }
 153
 154         mutex_unlock(&tegra->clients_lock);
 155
 156         return 0;
 157 }
 158
 159 int tegra_drm_exit(struct tegra_drm *tegra)
 160 {
 161         struct host1x_client *client;
 162         struct platform_device *pdev;
 163         int err;
 164
 165         if (!tegra->drm)
 166                 return 0;
 167
 168         mutex_lock(&tegra->clients_lock);
 169
 170         list_for_each_entry_reverse(client, &tegra->clients, list) {
 171                 if (client->ops && client->ops->exit) {
 172                         err = client->ops->exit(client);
 173                         if (err < 0) {
 174                                 dev_err(tegra->dev,
 175                                         "DRM cleanup failed for %s: %d\n",
 176                                         dev_name(client->dev), err);
 177                                 mutex_unlock(&tegra->clients_lock);
 178                                 return err;
 179                         }
 180                 }
 181         }
 182
 183         mutex_unlock(&tegra->clients_lock);
 184
 185         pdev = to_platform_device(tegra->dev);
 186         drm_platform_exit(&tegra_drm_driver, pdev);
 187         tegra->drm = NULL;
 188
 189         return 0;
 190 }
 191
 192 int host1x_register_client(struct tegra_drm *tegra,
 193                            struct host1x_client *client)
 194 {
 195         struct host1x_subdev *subdev, *tmp;
 196         int err;
 197
 198         mutex_lock(&tegra->clients_lock);
 199         list_add_tail(&client->list, &tegra->clients);
 200         mutex_unlock(&tegra->clients_lock);
 201
 202         list_for_each_entry_safe(subdev, tmp, &tegra->subdevs, list)
 203                 if (subdev->np == client->dev->of_node)
 204                         host1x_subdev_register(tegra, subdev, client);
 205
 206         if (list_empty(&tegra->subdevs)) {
 207                 struct platform_device *pdev = to_platform_device(tegra->dev);
 208
 209                 err = drm_platform_init(&tegra_drm_driver, pdev);
 210                 if (err < 0) {
 211                         dev_err(tegra->dev, "drm_platform_init(): %d\n", err);
 212                         return err;
 213                 }
 214         }
 215
 216         return 0;
 217 }
 218
 219 int host1x_unregister_client(struct tegra_drm *tegra,
 220                              struct host1x_client *client)
 221 {
 222         struct host1x_subdev *subdev, *tmp;
 223         int err;
 224
 225         list_for_each_entry_safe(subdev, tmp, &tegra->active, list) {
 226                 if (subdev->client == client) {
 227                         err = tegra_drm_exit(tegra);
 228                         if (err < 0) {
 229                                 dev_err(tegra->dev, "tegra_drm_exit(): %d\n",
 230                                         err);
 231                                 return err;
 232                         }
 233
 234                         host1x_subdev_unregister(tegra, subdev);
 235                         break;
 236                 }
 237         }
 238
 239         mutex_lock(&tegra->clients_lock);
 240         list_del_init(&client->list);
 241         mutex_unlock(&tegra->clients_lock);
 242
 243         return 0;
 244 }
 245
 246 static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
 247 {
 248         struct tegra_drm *tegra;
 249         int err;
 250
 251         tegra = host1x_get_drm_data(drm->dev);
 252         drm->dev_private = tegra;
 253         tegra->drm = drm;
 254
 255         drm_mode_config_init(drm);
 256
 257         err = tegra_drm_init(tegra, drm);
 258         if (err < 0)
 259                 return err;
 260
 261         /*
 262          * We don't use the drm_irq_install() helpers provided by the DRM
 263          * core, so we need to set this manually in order to allow the
 264          * DRM_IOCTL_WAIT_VBLANK to operate correctly.
 265          */
 266         drm->irq_enabled = true;
 267
 268         err = drm_vblank_init(drm, drm->mode_config.num_crtc);
 269         if (err < 0)
 270                 return err;
 271
 272         err = tegra_drm_fb_init(drm);
 273         if (err < 0)
 274                 return err;
 275
 276         drm_kms_helper_poll_init(drm);
 277
 278         return 0;
 279 }
 280
 281 static int tegra_drm_unload(struct drm_device *drm)
 282 {
 283         drm_kms_helper_poll_fini(drm);
 284         tegra_drm_fb_exit(drm);
 285
 286         drm_mode_config_cleanup(drm);
 287
 288         return 0;
 289 }
 290
 291 static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
 292 {
 293         struct tegra_drm_file *fpriv;
 294
 295         fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL);
 296         if (!fpriv)
 297                 return -ENOMEM;
 298
 299         INIT_LIST_HEAD(&fpriv->contexts);
 300         filp->driver_priv = fpriv;
 301
 302         return 0;
 303 }
 304
 305 static void tegra_drm_context_free(struct tegra_drm_context *context)
 306 {
 307         context->client->ops->close_channel(context);
 308         kfree(context);
 309 }
 310
 311 static void tegra_drm_lastclose(struct drm_device *drm)
 312 {
 313         struct tegra_drm *tegra = drm->dev_private;
 314
 315         tegra_fbdev_restore_mode(tegra->fbdev);
 316 }
 317
 318 #ifdef CONFIG_DRM_TEGRA_STAGING
 319 static struct tegra_drm_context *tegra_drm_get_context(__u64 context)
 320 {
 321         return (struct tegra_drm_context *)(uintptr_t)context;
 322 }
 323
 324 static bool tegra_drm_file_owns_context(struct tegra_drm_file *file,
 325                                         struct tegra_drm_context *context)
 326 {
 327         struct tegra_drm_context *ctx;
 328
 329         list_for_each_entry(ctx, &file->contexts, list)
 330                 if (ctx == context)
 331                         return true;
 332
 333         return false;
 334 }
 335
 336 static int tegra_gem_create(struct drm_device *drm, void *data,
 337                             struct drm_file *file)
 338 {
 339         struct drm_tegra_gem_create *args = data;
 340         struct tegra_bo *bo;
 341
 342         bo = tegra_bo_create_with_handle(file, drm, args->size,
 343                                          &args->handle);
 344         if (IS_ERR(bo))
 345                 return PTR_ERR(bo);
 346
 347         return 0;
 348 }
 349
 350 static int tegra_gem_mmap(struct drm_device *drm, void *data,
 351                           struct drm_file *file)
 352 {
 353         struct drm_tegra_gem_mmap *args = data;
 354         struct drm_gem_object *gem;
 355         struct tegra_bo *bo;
 356
 357         gem = drm_gem_object_lookup(drm, file, args->handle);
 358         if (!gem)
 359                 return -EINVAL;
 360
 361         bo = to_tegra_bo(gem);
 362
 363         args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
 364
 365         drm_gem_object_unreference(gem);
 366
 367         return 0;
 368 }
 369
 370 static int tegra_syncpt_read(struct drm_device *drm, void *data,
 371                              struct drm_file *file)
 372 {
 373         struct drm_tegra_syncpt_read *args = data;
 374         struct host1x *host = dev_get_drvdata(drm->dev);
 375         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 376
 377         if (!sp)
 378                 return -EINVAL;
 379
 380         args->value = host1x_syncpt_read_min(sp);
 381         return 0;
 382 }
 383
 384 static int tegra_syncpt_incr(struct drm_device *drm, void *data,
 385                              struct drm_file *file)
 386 {
 387         struct drm_tegra_syncpt_incr *args = data;
 388         struct host1x *host = dev_get_drvdata(drm->dev);
 389         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 390
 391         if (!sp)
 392                 return -EINVAL;
 393
 394         return host1x_syncpt_incr(sp);
 395 }
 396
 397 static int tegra_syncpt_wait(struct drm_device *drm, void *data,
 398                              struct drm_file *file)
 399 {
 400         struct drm_tegra_syncpt_wait *args = data;
 401         struct host1x *host = dev_get_drvdata(drm->dev);
 402         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 403
 404         if (!sp)
 405                 return -EINVAL;
 406
 407         return host1x_syncpt_wait(sp, args->thresh, args->timeout,
 408                                   &args->value);
 409 }
 410
 411 static int tegra_open_channel(struct drm_device *drm, void *data,
 412                               struct drm_file *file)
 413 {
 414         struct tegra_drm_file *fpriv = file->driver_priv;
 415         struct tegra_drm *tegra = drm->dev_private;
 416         struct drm_tegra_open_channel *args = data;
 417         struct tegra_drm_context *context;
 418         struct tegra_drm_client *client;
 419         int err = -ENODEV;
 420
 421         context = kzalloc(sizeof(*context), GFP_KERNEL);
 422         if (!context)
 423                 return -ENOMEM;
 424
 425         list_for_each_entry(client, &tegra->clients, base.list)
 426                 if (client->base.class == args->client) {
 427                         err = client->ops->open_channel(client, context);
 428                         if (err)
 429                                 break;
 430
 431                         list_add(&context->list, &fpriv->contexts);
 432                         args->context = (uintptr_t)context;
 433                         context->client = client;
 434                         return 0;
 435                 }
 436
 437         kfree(context);
 438         return err;
 439 }
 440
 441 static int tegra_close_channel(struct drm_device *drm, void *data,
 442                                struct drm_file *file)
 443 {
 444         struct drm_tegra_close_channel *args = data;
 445         struct tegra_drm_file *fpriv = file->driver_priv;
 446         struct tegra_drm_context *context;
 447
 448         context = tegra_drm_get_context(args->context);
 449
 450         if (!tegra_drm_file_owns_context(fpriv, context))
 451                 return -EINVAL;
 452
 453         list_del(&context->list);
 454         tegra_drm_context_free(context);
 455
 456         return 0;
 457 }
 458
 459 static int tegra_get_syncpt(struct drm_device *drm, void *data,
 460                             struct drm_file *file)
 461 {
 462         struct tegra_drm_file *fpriv = file->driver_priv;
 463         struct drm_tegra_get_syncpt *args = data;
 464         struct tegra_drm_context *context;
 465         struct host1x_syncpt *syncpt;
 466
 467         context = tegra_drm_get_context(args->context);
 468
 469         if (!tegra_drm_file_owns_context(fpriv, context))
 470                 return -ENODEV;
 471
 472         if (args->index >= context->client->base.num_syncpts)
 473                 return -EINVAL;
 474
 475         syncpt = context->client->base.syncpts[args->index];
 476         args->id = host1x_syncpt_id(syncpt);
 477
 478         return 0;
 479 }
 480
 481 static int tegra_submit(struct drm_device *drm, void *data,
 482                         struct drm_file *file)
 483 {
 484         struct tegra_drm_file *fpriv = file->driver_priv;
 485         struct drm_tegra_submit *args = data;
 486         struct tegra_drm_context *context;
 487
 488         context = tegra_drm_get_context(args->context);
 489
 490         if (!tegra_drm_file_owns_context(fpriv, context))
 491                 return -ENODEV;
 492
 493         return context->client->ops->submit(context, args, drm, file);
 494 }
 495 #endif
 496
 497 static const struct drm_ioctl_desc tegra_drm_ioctls[] = {
 498 #ifdef CONFIG_DRM_TEGRA_STAGING
 499         DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create, DRM_UNLOCKED | DRM_AUTH),
 500         DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap, DRM_UNLOCKED),
 501         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read, DRM_UNLOCKED),
 502         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr, DRM_UNLOCKED),
 503         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait, DRM_UNLOCKED),
 504         DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel, DRM_UNLOCKED),
 505         DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel, DRM_UNLOCKED),
 506         DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt, DRM_UNLOCKED),
 507         DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit, DRM_UNLOCKED),
 508 #endif
 509 };
 510
 511 static const struct file_operations tegra_drm_fops = {
 512         .owner = THIS_MODULE,
 513         .open = drm_open,
 514         .release = drm_release,
 515         .unlocked_ioctl = drm_ioctl,
 516         .mmap = tegra_drm_mmap,
 517         .poll = drm_poll,
 518         .read = drm_read,
 519 #ifdef CONFIG_COMPAT
 520         .compat_ioctl = drm_compat_ioctl,
 521 #endif
 522         .llseek = noop_llseek,
 523 };
 524
 525 static struct drm_crtc *tegra_crtc_from_pipe(struct drm_device *drm, int pipe)
 526 {
 527         struct drm_crtc *crtc;
 528
 529         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head) {
 530                 struct tegra_dc *dc = to_tegra_dc(crtc);
 531
 532                 if (dc->pipe == pipe)
 533                         return crtc;
 534         }
 535
 536         return NULL;
 537 }
 538
 539 static u32 tegra_drm_get_vblank_counter(struct drm_device *dev, int crtc)
 540 {
 541         /* TODO: implement real hardware counter using syncpoints */
 542         return drm_vblank_count(dev, crtc);
 543 }
 544
 545 static int tegra_drm_enable_vblank(struct drm_device *drm, int pipe)
 546 {
 547         struct drm_crtc *crtc = tegra_crtc_from_pipe(drm, pipe);
 548         struct tegra_dc *dc = to_tegra_dc(crtc);
 549
 550         if (!crtc)
 551                 return -ENODEV;
 552
 553         tegra_dc_enable_vblank(dc);
 554
 555         return 0;
 556 }
 557
 558 static void tegra_drm_disable_vblank(struct drm_device *drm, int pipe)
 559 {
 560         struct drm_crtc *crtc = tegra_crtc_from_pipe(drm, pipe);
 561         struct tegra_dc *dc = to_tegra_dc(crtc);
 562
 563         if (crtc)
 564                 tegra_dc_disable_vblank(dc);
 565 }
 566
 567 static void tegra_drm_preclose(struct drm_device *drm, struct drm_file *file)
 568 {
 569         struct tegra_drm_file *fpriv = file->driver_priv;
 570         struct tegra_drm_context *context, *tmp;
 571         struct drm_crtc *crtc;
 572
 573         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
 574                 tegra_dc_cancel_page_flip(crtc, file);
 575
 576         list_for_each_entry_safe(context, tmp, &fpriv->contexts, list)
 577                 tegra_drm_context_free(context);
 578
 579         kfree(fpriv);
 580 }
 581
 582 #ifdef CONFIG_DEBUG_FS
 583 static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
 584 {
 585         struct drm_info_node *node = (struct drm_info_node *)s->private;
 586         struct drm_device *drm = node->minor->dev;
 587         struct drm_framebuffer *fb;
 588
 589         mutex_lock(&drm->mode_config.fb_lock);
 590
 591         list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
 592                 seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
 593                            fb->base.id, fb->width, fb->height, fb->depth,
 594                            fb->bits_per_pixel,
 595                            atomic_read(&fb->refcount.refcount));
 596         }
 597
 598         mutex_unlock(&drm->mode_config.fb_lock);
 599
 600         return 0;
 601 }
 602
 603 static struct drm_info_list tegra_debugfs_list[] = {
 604         { "framebuffers", tegra_debugfs_framebuffers, 0 },
 605 };
 606
 607 static int tegra_debugfs_init(struct drm_minor *minor)
 608 {
 609         return drm_debugfs_create_files(tegra_debugfs_list,
 610                                         ARRAY_SIZE(tegra_debugfs_list),
 611                                         minor->debugfs_root, minor);
 612 }
 613
 614 static void tegra_debugfs_cleanup(struct drm_minor *minor)
 615 {
 616         drm_debugfs_remove_files(tegra_debugfs_list,
 617                                  ARRAY_SIZE(tegra_debugfs_list), minor);
 618 }
 619 #endif
 620
 621 struct drm_driver tegra_drm_driver = {
 622         .driver_features = DRIVER_MODESET | DRIVER_GEM,
 623         .load = tegra_drm_load,
 624         .unload = tegra_drm_unload,
 625         .open = tegra_drm_open,
 626         .preclose = tegra_drm_preclose,
 627         .lastclose = tegra_drm_lastclose,
 628
 629         .get_vblank_counter = tegra_drm_get_vblank_counter,
 630         .enable_vblank = tegra_drm_enable_vblank,
 631         .disable_vblank = tegra_drm_disable_vblank,
 632
 633 #if defined(CONFIG_DEBUG_FS)
 634         .debugfs_init = tegra_debugfs_init,
 635         .debugfs_cleanup = tegra_debugfs_cleanup,
 636 #endif
 637
 638         .gem_free_object = tegra_bo_free_object,
 639         .gem_vm_ops = &tegra_bo_vm_ops,
 640         .dumb_create = tegra_bo_dumb_create,
 641         .dumb_map_offset = tegra_bo_dumb_map_offset,
 642         .dumb_destroy = drm_gem_dumb_destroy,
 643
 644         .ioctls = tegra_drm_ioctls,
 645         .num_ioctls = ARRAY_SIZE(tegra_drm_ioctls),
 646         .fops = &tegra_drm_fops,
 647
 648         .name = DRIVER_NAME,
 649         .desc = DRIVER_DESC,
 650         .date = DRIVER_DATE,
 651         .major = DRIVER_MAJOR,
 652         .minor = DRIVER_MINOR,
 653         .patchlevel = DRIVER_PATCHLEVEL,
 654 };