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 <linux/module.h>
  11 #include <linux/of_address.h>
  12 #include <linux/of_platform.h>
  13
  14 #include <linux/dma-mapping.h>
  15 #include <asm/dma-iommu.h>
  16
  17 #include <drm/drm.h>
  18 #include <drm/drmP.h>
  19
  20 #include "host1x_client.h"
  21 #include "dev.h"
  22 #include "drm.h"
  23 #include "gem.h"
  24 #include "syncpt.h"
  25
  26 #define DRIVER_NAME "tegra"
  27 #define DRIVER_DESC "NVIDIA Tegra graphics"
  28 #define DRIVER_DATE "20120330"
  29 #define DRIVER_MAJOR 0
  30 #define DRIVER_MINOR 0
  31 #define DRIVER_PATCHLEVEL 0
  32
  33 struct host1x_subdev {
  34         struct host1x_client *client;
  35         struct device_node *np;
  36         struct list_head list;
  37 };
  38
  39 static int host1x_subdev_add(struct tegra_drm *tegra, struct device_node *np)
  40 {
  41         struct host1x_subdev *subdev;
  42
  43         subdev = kzalloc(sizeof(*subdev), GFP_KERNEL);
  44         if (!subdev)
  45                 return -ENOMEM;
  46
  47         INIT_LIST_HEAD(&subdev->list);
  48         subdev->np = of_node_get(np);
  49
  50         list_add_tail(&subdev->list, &tegra->subdevs);
  51
  52         return 0;
  53 }
  54
  55 static int host1x_subdev_register(struct tegra_drm *tegra,
  56                                   struct host1x_subdev *subdev,
  57                                   struct host1x_client *client)
  58 {
  59         mutex_lock(&tegra->subdevs_lock);
  60         list_del_init(&subdev->list);
  61         list_add_tail(&subdev->list, &tegra->active);
  62         subdev->client = client;
  63         mutex_unlock(&tegra->subdevs_lock);
  64
  65         return 0;
  66 }
  67
  68 static int host1x_subdev_unregister(struct tegra_drm *tegra,
  69                                     struct host1x_subdev *subdev)
  70 {
  71         mutex_lock(&tegra->subdevs_lock);
  72         list_del_init(&subdev->list);
  73         mutex_unlock(&tegra->subdevs_lock);
  74
  75         of_node_put(subdev->np);
  76         kfree(subdev);
  77
  78         return 0;
  79 }
  80
  81 static int tegra_parse_dt(struct tegra_drm *tegra)
  82 {
  83         static const char * const compat[] = {
  84                 "nvidia,tegra20-dc",
  85                 "nvidia,tegra20-hdmi",
  86                 "nvidia,tegra20-gr2d",
  87                 "nvidia,tegra30-dc",
  88                 "nvidia,tegra30-hdmi",
  89                 "nvidia,tegra30-gr2d",
  90         };
  91         unsigned int i;
  92         int err;
  93
  94         for (i = 0; i < ARRAY_SIZE(compat); i++) {
  95                 struct device_node *np;
  96
  97                 for_each_child_of_node(tegra->dev->of_node, np) {
  98                         if (of_device_is_compatible(np, compat[i]) &&
  99                             of_device_is_available(np)) {
 100                                 err = host1x_subdev_add(tegra, np);
 101                                 if (err < 0)
 102                                         return err;
 103                         }
 104                 }
 105         }
 106
 107         return 0;
 108 }
 109
 110 int tegra_drm_alloc(struct platform_device *pdev)
 111 {
 112         struct tegra_drm *tegra;
 113         int err;
 114
 115         tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
 116         if (!tegra)
 117                 return -ENOMEM;
 118
 119         mutex_init(&tegra->subdevs_lock);
 120         INIT_LIST_HEAD(&tegra->subdevs);
 121         INIT_LIST_HEAD(&tegra->active);
 122         mutex_init(&tegra->clients_lock);
 123         INIT_LIST_HEAD(&tegra->clients);
 124         tegra->dev = &pdev->dev;
 125
 126         err = tegra_parse_dt(tegra);
 127         if (err < 0) {
 128                 dev_err(&pdev->dev, "failed to parse DT: %d\n", err);
 129                 return err;
 130         }
 131
 132         host1x_set_drm_data(&pdev->dev, tegra);
 133
 134         return 0;
 135 }
 136
 137 int tegra_drm_init(struct tegra_drm *tegra, struct drm_device *drm)
 138 {
 139         struct host1x_client *client;
 140
 141         mutex_lock(&tegra->clients_lock);
 142
 143         list_for_each_entry(client, &tegra->clients, list) {
 144                 if (client->ops && client->ops->drm_init) {
 145                         int err = client->ops->drm_init(client, drm);
 146                         if (err < 0) {
 147                                 dev_err(tegra->dev,
 148                                         "DRM setup failed for %s: %d\n",
 149                                         dev_name(client->dev), err);
 150                                 mutex_unlock(&tegra->clients_lock);
 151                                 return err;
 152                         }
 153                 }
 154         }
 155
 156         mutex_unlock(&tegra->clients_lock);
 157
 158         return 0;
 159 }
 160
 161 int tegra_drm_exit(struct tegra_drm *tegra)
 162 {
 163         struct platform_device *pdev = to_platform_device(tegra->dev);
 164         struct host1x_client *client;
 165
 166         if (!tegra->drm)
 167                 return 0;
 168
 169         mutex_lock(&tegra->clients_lock);
 170
 171         list_for_each_entry_reverse(client, &tegra->clients, list) {
 172                 if (client->ops && client->ops->drm_exit) {
 173                         int err = client->ops->drm_exit(client);
 174                         if (err < 0) {
 175                                 dev_err(tegra->dev,
 176                                         "DRM cleanup failed for %s: %d\n",
 177                                         dev_name(client->dev), err);
 178                                 mutex_unlock(&tegra->clients_lock);
 179                                 return err;
 180                         }
 181                 }
 182         }
 183
 184         mutex_unlock(&tegra->clients_lock);
 185
 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 host1x_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 host1x_drm_context_free(struct host1x_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 bool host1x_drm_file_owns_context(struct host1x_drm_file *file,
 320                                          struct host1x_drm_context *context)
 321 {
 322         struct host1x_drm_context *ctx;
 323
 324         list_for_each_entry(ctx, &file->contexts, list)
 325                 if (ctx == context)
 326                         return true;
 327
 328         return false;
 329 }
 330
 331 static int tegra_gem_create(struct drm_device *drm, void *data,
 332                             struct drm_file *file)
 333 {
 334         struct drm_tegra_gem_create *args = data;
 335         struct tegra_bo *bo;
 336
 337         bo = tegra_bo_create_with_handle(file, drm, args->size,
 338                                          &args->handle);
 339         if (IS_ERR(bo))
 340                 return PTR_ERR(bo);
 341
 342         return 0;
 343 }
 344
 345 static int tegra_gem_mmap(struct drm_device *drm, void *data,
 346                           struct drm_file *file)
 347 {
 348         struct drm_tegra_gem_mmap *args = data;
 349         struct drm_gem_object *gem;
 350         struct tegra_bo *bo;
 351
 352         gem = drm_gem_object_lookup(drm, file, args->handle);
 353         if (!gem)
 354                 return -EINVAL;
 355
 356         bo = to_tegra_bo(gem);
 357
 358         args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
 359
 360         drm_gem_object_unreference(gem);
 361
 362         return 0;
 363 }
 364
 365 static int tegra_syncpt_read(struct drm_device *drm, void *data,
 366                              struct drm_file *file)
 367 {
 368         struct drm_tegra_syncpt_read *args = data;
 369         struct host1x *host = dev_get_drvdata(drm->dev);
 370         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 371
 372         if (!sp)
 373                 return -EINVAL;
 374
 375         args->value = host1x_syncpt_read_min(sp);
 376         return 0;
 377 }
 378
 379 static int tegra_syncpt_incr(struct drm_device *drm, void *data,
 380                              struct drm_file *file)
 381 {
 382         struct drm_tegra_syncpt_incr *args = data;
 383         struct host1x *host = dev_get_drvdata(drm->dev);
 384         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 385
 386         if (!sp)
 387                 return -EINVAL;
 388
 389         return host1x_syncpt_incr(sp);
 390 }
 391
 392 static int tegra_syncpt_wait(struct drm_device *drm, void *data,
 393                              struct drm_file *file)
 394 {
 395         struct drm_tegra_syncpt_wait *args = data;
 396         struct host1x *host = dev_get_drvdata(drm->dev);
 397         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 398
 399         if (!sp)
 400                 return -EINVAL;
 401
 402         return host1x_syncpt_wait(sp, args->thresh, args->timeout,
 403                                   &args->value);
 404 }
 405
 406 static int tegra_open_channel(struct drm_device *drm, void *data,
 407                               struct drm_file *file)
 408 {
 409         struct host1x_drm_file *fpriv = file->driver_priv;
 410         struct tegra_drm *tegra = drm->dev_private;
 411         struct drm_tegra_open_channel *args = data;
 412         struct host1x_drm_context *context;
 413         struct host1x_client *client;
 414         int err = -ENODEV;
 415
 416         context = kzalloc(sizeof(*context), GFP_KERNEL);
 417         if (!context)
 418                 return -ENOMEM;
 419
 420         list_for_each_entry(client, &tegra->clients, list)
 421                 if (client->class == args->client) {
 422                         err = client->ops->open_channel(client, context);
 423                         if (err)
 424                                 break;
 425
 426                         context->client = client;
 427                         list_add(&context->list, &fpriv->contexts);
 428                         args->context = (uintptr_t)context;
 429                         return 0;
 430                 }
 431
 432         kfree(context);
 433         return err;
 434 }
 435
 436 static int tegra_close_channel(struct drm_device *drm, void *data,
 437                                struct drm_file *file)
 438 {
 439         struct drm_tegra_close_channel *args = data;
 440         struct host1x_drm_file *fpriv = file->driver_priv;
 441         struct host1x_drm_context *context =
 442                 (struct host1x_drm_context *)(uintptr_t)args->context;
 443
 444         if (!host1x_drm_file_owns_context(fpriv, context))
 445                 return -EINVAL;
 446
 447         list_del(&context->list);
 448         host1x_drm_context_free(context);
 449
 450         return 0;
 451 }
 452
 453 static int tegra_get_syncpt(struct drm_device *drm, void *data,
 454                             struct drm_file *file)
 455 {
 456         struct drm_tegra_get_syncpt *args = data;
 457         struct host1x_drm_file *fpriv = file->driver_priv;
 458         struct host1x_drm_context *context =
 459                 (struct host1x_drm_context *)(uintptr_t)args->context;
 460         struct host1x_syncpt *syncpt;
 461
 462         if (!host1x_drm_file_owns_context(fpriv, context))
 463                 return -ENODEV;
 464
 465         if (args->index >= context->client->num_syncpts)
 466                 return -EINVAL;
 467
 468         syncpt = context->client->syncpts[args->index];
 469         args->id = host1x_syncpt_id(syncpt);
 470
 471         return 0;
 472 }
 473
 474 static int tegra_submit(struct drm_device *drm, void *data,
 475                         struct drm_file *file)
 476 {
 477         struct drm_tegra_submit *args = data;
 478         struct host1x_drm_file *fpriv = file->driver_priv;
 479         struct host1x_drm_context *context =
 480                 (struct host1x_drm_context *)(uintptr_t)args->context;
 481
 482         if (!host1x_drm_file_owns_context(fpriv, context))
 483                 return -ENODEV;
 484
 485         return context->client->ops->submit(context, args, drm, file);
 486 }
 487 #endif
 488
 489 static const struct drm_ioctl_desc tegra_drm_ioctls[] = {
 490 #ifdef CONFIG_DRM_TEGRA_STAGING
 491         DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create, DRM_UNLOCKED | DRM_AUTH),
 492         DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap, DRM_UNLOCKED),
 493         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read, DRM_UNLOCKED),
 494         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr, DRM_UNLOCKED),
 495         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait, DRM_UNLOCKED),
 496         DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel, DRM_UNLOCKED),
 497         DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel, DRM_UNLOCKED),
 498         DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt, DRM_UNLOCKED),
 499         DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit, DRM_UNLOCKED),
 500 #endif
 501 };
 502
 503 static const struct file_operations tegra_drm_fops = {
 504         .owner = THIS_MODULE,
 505         .open = drm_open,
 506         .release = drm_release,
 507         .unlocked_ioctl = drm_ioctl,
 508         .mmap = tegra_drm_mmap,
 509         .poll = drm_poll,
 510         .read = drm_read,
 511 #ifdef CONFIG_COMPAT
 512         .compat_ioctl = drm_compat_ioctl,
 513 #endif
 514         .llseek = noop_llseek,
 515 };
 516
 517 static struct drm_crtc *tegra_crtc_from_pipe(struct drm_device *drm, int pipe)
 518 {
 519         struct drm_crtc *crtc;
 520
 521         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head) {
 522                 struct tegra_dc *dc = to_tegra_dc(crtc);
 523
 524                 if (dc->pipe == pipe)
 525                         return crtc;
 526         }
 527
 528         return NULL;
 529 }
 530
 531 static u32 tegra_drm_get_vblank_counter(struct drm_device *dev, int crtc)
 532 {
 533         /* TODO: implement real hardware counter using syncpoints */
 534         return drm_vblank_count(dev, crtc);
 535 }
 536
 537 static int tegra_drm_enable_vblank(struct drm_device *drm, int pipe)
 538 {
 539         struct drm_crtc *crtc = tegra_crtc_from_pipe(drm, pipe);
 540         struct tegra_dc *dc = to_tegra_dc(crtc);
 541
 542         if (!crtc)
 543                 return -ENODEV;
 544
 545         tegra_dc_enable_vblank(dc);
 546
 547         return 0;
 548 }
 549
 550 static void tegra_drm_disable_vblank(struct drm_device *drm, int pipe)
 551 {
 552         struct drm_crtc *crtc = tegra_crtc_from_pipe(drm, pipe);
 553         struct tegra_dc *dc = to_tegra_dc(crtc);
 554
 555         if (crtc)
 556                 tegra_dc_disable_vblank(dc);
 557 }
 558
 559 static void tegra_drm_preclose(struct drm_device *drm, struct drm_file *file)
 560 {
 561         struct host1x_drm_file *fpriv = file->driver_priv;
 562         struct host1x_drm_context *context, *tmp;
 563         struct drm_crtc *crtc;
 564
 565         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
 566                 tegra_dc_cancel_page_flip(crtc, file);
 567
 568         list_for_each_entry_safe(context, tmp, &fpriv->contexts, list)
 569                 host1x_drm_context_free(context);
 570
 571         kfree(fpriv);
 572 }
 573
 574 #ifdef CONFIG_DEBUG_FS
 575 static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
 576 {
 577         struct drm_info_node *node = (struct drm_info_node *)s->private;
 578         struct drm_device *drm = node->minor->dev;
 579         struct drm_framebuffer *fb;
 580
 581         mutex_lock(&drm->mode_config.fb_lock);
 582
 583         list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
 584                 seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
 585                            fb->base.id, fb->width, fb->height, fb->depth,
 586                            fb->bits_per_pixel,
 587                            atomic_read(&fb->refcount.refcount));
 588         }
 589
 590         mutex_unlock(&drm->mode_config.fb_lock);
 591
 592         return 0;
 593 }
 594
 595 static struct drm_info_list tegra_debugfs_list[] = {
 596         { "framebuffers", tegra_debugfs_framebuffers, 0 },
 597 };
 598
 599 static int tegra_debugfs_init(struct drm_minor *minor)
 600 {
 601         return drm_debugfs_create_files(tegra_debugfs_list,
 602                                         ARRAY_SIZE(tegra_debugfs_list),
 603                                         minor->debugfs_root, minor);
 604 }
 605
 606 static void tegra_debugfs_cleanup(struct drm_minor *minor)
 607 {
 608         drm_debugfs_remove_files(tegra_debugfs_list,
 609                                  ARRAY_SIZE(tegra_debugfs_list), minor);
 610 }
 611 #endif
 612
 613 struct drm_driver tegra_drm_driver = {
 614         .driver_features = DRIVER_MODESET | DRIVER_GEM,
 615         .load = tegra_drm_load,
 616         .unload = tegra_drm_unload,
 617         .open = tegra_drm_open,
 618         .preclose = tegra_drm_preclose,
 619         .lastclose = tegra_drm_lastclose,
 620
 621         .get_vblank_counter = tegra_drm_get_vblank_counter,
 622         .enable_vblank = tegra_drm_enable_vblank,
 623         .disable_vblank = tegra_drm_disable_vblank,
 624
 625 #if defined(CONFIG_DEBUG_FS)
 626         .debugfs_init = tegra_debugfs_init,
 627         .debugfs_cleanup = tegra_debugfs_cleanup,
 628 #endif
 629
 630         .gem_free_object = tegra_bo_free_object,
 631         .gem_vm_ops = &tegra_bo_vm_ops,
 632         .dumb_create = tegra_bo_dumb_create,
 633         .dumb_map_offset = tegra_bo_dumb_map_offset,
 634         .dumb_destroy = drm_gem_dumb_destroy,
 635
 636         .ioctls = tegra_drm_ioctls,
 637         .num_ioctls = ARRAY_SIZE(tegra_drm_ioctls),
 638         .fops = &tegra_drm_fops,
 639
 640         .name = DRIVER_NAME,
 641         .desc = DRIVER_DESC,
 642         .date = DRIVER_DATE,
 643         .major = DRIVER_MAJOR,
 644         .minor = DRIVER_MINOR,
 645         .patchlevel = DRIVER_PATCHLEVEL,
 646 };