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 tegra_drm_file {
  34         struct list_head contexts;
  35 };
  36
  37 struct host1x_subdev {
  38         struct host1x_client *client;
  39         struct device_node *np;
  40         struct list_head list;
  41 };
  42
  43 static int host1x_subdev_add(struct tegra_drm *tegra, struct device_node *np)
  44 {
  45         struct host1x_subdev *subdev;
  46
  47         subdev = kzalloc(sizeof(*subdev), GFP_KERNEL);
  48         if (!subdev)
  49                 return -ENOMEM;
  50
  51         INIT_LIST_HEAD(&subdev->list);
  52         subdev->np = of_node_get(np);
  53
  54         list_add_tail(&subdev->list, &tegra->subdevs);
  55
  56         return 0;
  57 }
  58
  59 static int host1x_subdev_register(struct tegra_drm *tegra,
  60                                   struct host1x_subdev *subdev,
  61                                   struct host1x_client *client)
  62 {
  63         mutex_lock(&tegra->subdevs_lock);
  64         list_del_init(&subdev->list);
  65         list_add_tail(&subdev->list, &tegra->active);
  66         subdev->client = client;
  67         mutex_unlock(&tegra->subdevs_lock);
  68
  69         return 0;
  70 }
  71
  72 static int host1x_subdev_unregister(struct tegra_drm *tegra,
  73                                     struct host1x_subdev *subdev)
  74 {
  75         mutex_lock(&tegra->subdevs_lock);
  76         list_del_init(&subdev->list);
  77         mutex_unlock(&tegra->subdevs_lock);
  78
  79         of_node_put(subdev->np);
  80         kfree(subdev);
  81
  82         return 0;
  83 }
  84
  85 static int tegra_parse_dt(struct tegra_drm *tegra)
  86 {
  87         static const char * const compat[] = {
  88                 "nvidia,tegra20-dc",
  89                 "nvidia,tegra20-hdmi",
  90                 "nvidia,tegra20-gr2d",
  91                 "nvidia,tegra30-dc",
  92                 "nvidia,tegra30-hdmi",
  93                 "nvidia,tegra30-gr2d",
  94         };
  95         unsigned int i;
  96         int err;
  97
  98         for (i = 0; i < ARRAY_SIZE(compat); i++) {
  99                 struct device_node *np;
 100
 101                 for_each_child_of_node(tegra->dev->of_node, np) {
 102                         if (of_device_is_compatible(np, compat[i]) &&
 103                             of_device_is_available(np)) {
 104                                 err = host1x_subdev_add(tegra, np);
 105                                 if (err < 0)
 106                                         return err;
 107                         }
 108                 }
 109         }
 110
 111         return 0;
 112 }
 113
 114 int tegra_drm_alloc(struct platform_device *pdev)
 115 {
 116         struct tegra_drm *tegra;
 117         int err;
 118
 119         tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
 120         if (!tegra)
 121                 return -ENOMEM;
 122
 123         mutex_init(&tegra->subdevs_lock);
 124         INIT_LIST_HEAD(&tegra->subdevs);
 125         INIT_LIST_HEAD(&tegra->active);
 126         mutex_init(&tegra->clients_lock);
 127         INIT_LIST_HEAD(&tegra->clients);
 128         tegra->dev = &pdev->dev;
 129
 130         err = tegra_parse_dt(tegra);
 131         if (err < 0) {
 132                 dev_err(&pdev->dev, "failed to parse DT: %d\n", err);
 133                 return err;
 134         }
 135
 136         host1x_set_drm_data(&pdev->dev, tegra);
 137
 138         return 0;
 139 }
 140
 141 int tegra_drm_init(struct tegra_drm *tegra, struct drm_device *drm)
 142 {
 143         struct host1x_client *client;
 144
 145         mutex_lock(&tegra->clients_lock);
 146
 147         list_for_each_entry(client, &tegra->clients, list) {
 148                 if (client->ops && client->ops->drm_init) {
 149                         int err = client->ops->drm_init(client, drm);
 150                         if (err < 0) {
 151                                 dev_err(tegra->dev,
 152                                         "DRM setup failed for %s: %d\n",
 153                                         dev_name(client->dev), err);
 154                                 mutex_unlock(&tegra->clients_lock);
 155                                 return err;
 156                         }
 157                 }
 158         }
 159
 160         mutex_unlock(&tegra->clients_lock);
 161
 162         return 0;
 163 }
 164
 165 int tegra_drm_exit(struct tegra_drm *tegra)
 166 {
 167         struct platform_device *pdev = to_platform_device(tegra->dev);
 168         struct host1x_client *client;
 169
 170         if (!tegra->drm)
 171                 return 0;
 172
 173         mutex_lock(&tegra->clients_lock);
 174
 175         list_for_each_entry_reverse(client, &tegra->clients, list) {
 176                 if (client->ops && client->ops->drm_exit) {
 177                         int err = client->ops->drm_exit(client);
 178                         if (err < 0) {
 179                                 dev_err(tegra->dev,
 180                                         "DRM cleanup failed for %s: %d\n",
 181                                         dev_name(client->dev), err);
 182                                 mutex_unlock(&tegra->clients_lock);
 183                                 return err;
 184                         }
 185                 }
 186         }
 187
 188         mutex_unlock(&tegra->clients_lock);
 189
 190         drm_platform_exit(&tegra_drm_driver, pdev);
 191         tegra->drm = NULL;
 192
 193         return 0;
 194 }
 195
 196 int host1x_register_client(struct tegra_drm *tegra,
 197                            struct host1x_client *client)
 198 {
 199         struct host1x_subdev *subdev, *tmp;
 200         int err;
 201
 202         mutex_lock(&tegra->clients_lock);
 203         list_add_tail(&client->list, &tegra->clients);
 204         mutex_unlock(&tegra->clients_lock);
 205
 206         list_for_each_entry_safe(subdev, tmp, &tegra->subdevs, list)
 207                 if (subdev->np == client->dev->of_node)
 208                         host1x_subdev_register(tegra, subdev, client);
 209
 210         if (list_empty(&tegra->subdevs)) {
 211                 struct platform_device *pdev = to_platform_device(tegra->dev);
 212
 213                 err = drm_platform_init(&tegra_drm_driver, pdev);
 214                 if (err < 0) {
 215                         dev_err(tegra->dev, "drm_platform_init(): %d\n", err);
 216                         return err;
 217                 }
 218         }
 219
 220         return 0;
 221 }
 222
 223 int host1x_unregister_client(struct tegra_drm *tegra,
 224                              struct host1x_client *client)
 225 {
 226         struct host1x_subdev *subdev, *tmp;
 227         int err;
 228
 229         list_for_each_entry_safe(subdev, tmp, &tegra->active, list) {
 230                 if (subdev->client == client) {
 231                         err = tegra_drm_exit(tegra);
 232                         if (err < 0) {
 233                                 dev_err(tegra->dev, "tegra_drm_exit(): %d\n",
 234                                         err);
 235                                 return err;
 236                         }
 237
 238                         host1x_subdev_unregister(tegra, subdev);
 239                         break;
 240                 }
 241         }
 242
 243         mutex_lock(&tegra->clients_lock);
 244         list_del_init(&client->list);
 245         mutex_unlock(&tegra->clients_lock);
 246
 247         return 0;
 248 }
 249
 250 static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
 251 {
 252         struct tegra_drm *tegra;
 253         int err;
 254
 255         tegra = host1x_get_drm_data(drm->dev);
 256         drm->dev_private = tegra;
 257         tegra->drm = drm;
 258
 259         drm_mode_config_init(drm);
 260
 261         err = tegra_drm_init(tegra, drm);
 262         if (err < 0)
 263                 return err;
 264
 265         /*
 266          * We don't use the drm_irq_install() helpers provided by the DRM
 267          * core, so we need to set this manually in order to allow the
 268          * DRM_IOCTL_WAIT_VBLANK to operate correctly.
 269          */
 270         drm->irq_enabled = true;
 271
 272         err = drm_vblank_init(drm, drm->mode_config.num_crtc);
 273         if (err < 0)
 274                 return err;
 275
 276         err = tegra_drm_fb_init(drm);
 277         if (err < 0)
 278                 return err;
 279
 280         drm_kms_helper_poll_init(drm);
 281
 282         return 0;
 283 }
 284
 285 static int tegra_drm_unload(struct drm_device *drm)
 286 {
 287         drm_kms_helper_poll_fini(drm);
 288         tegra_drm_fb_exit(drm);
 289
 290         drm_mode_config_cleanup(drm);
 291
 292         return 0;
 293 }
 294
 295 static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
 296 {
 297         struct tegra_drm_file *fpriv;
 298
 299         fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL);
 300         if (!fpriv)
 301                 return -ENOMEM;
 302
 303         INIT_LIST_HEAD(&fpriv->contexts);
 304         filp->driver_priv = fpriv;
 305
 306         return 0;
 307 }
 308
 309 static void tegra_drm_context_free(struct tegra_drm_context *context)
 310 {
 311         context->client->ops->close_channel(context);
 312         kfree(context);
 313 }
 314
 315 static void tegra_drm_lastclose(struct drm_device *drm)
 316 {
 317         struct tegra_drm *tegra = drm->dev_private;
 318
 319         tegra_fbdev_restore_mode(tegra->fbdev);
 320 }
 321
 322 #ifdef CONFIG_DRM_TEGRA_STAGING
 323 static struct tegra_drm_context *tegra_drm_get_context(__u64 context)
 324 {
 325         return (struct tegra_drm_context *)(uintptr_t)context;
 326 }
 327
 328 static bool tegra_drm_file_owns_context(struct tegra_drm_file *file,
 329                                         struct tegra_drm_context *context)
 330 {
 331         struct tegra_drm_context *ctx;
 332
 333         list_for_each_entry(ctx, &file->contexts, list)
 334                 if (ctx == context)
 335                         return true;
 336
 337         return false;
 338 }
 339
 340 static int tegra_gem_create(struct drm_device *drm, void *data,
 341                             struct drm_file *file)
 342 {
 343         struct drm_tegra_gem_create *args = data;
 344         struct tegra_bo *bo;
 345
 346         bo = tegra_bo_create_with_handle(file, drm, args->size,
 347                                          &args->handle);
 348         if (IS_ERR(bo))
 349                 return PTR_ERR(bo);
 350
 351         return 0;
 352 }
 353
 354 static int tegra_gem_mmap(struct drm_device *drm, void *data,
 355                           struct drm_file *file)
 356 {
 357         struct drm_tegra_gem_mmap *args = data;
 358         struct drm_gem_object *gem;
 359         struct tegra_bo *bo;
 360
 361         gem = drm_gem_object_lookup(drm, file, args->handle);
 362         if (!gem)
 363                 return -EINVAL;
 364
 365         bo = to_tegra_bo(gem);
 366
 367         args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
 368
 369         drm_gem_object_unreference(gem);
 370
 371         return 0;
 372 }
 373
 374 static int tegra_syncpt_read(struct drm_device *drm, void *data,
 375                              struct drm_file *file)
 376 {
 377         struct drm_tegra_syncpt_read *args = data;
 378         struct host1x *host = dev_get_drvdata(drm->dev);
 379         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 380
 381         if (!sp)
 382                 return -EINVAL;
 383
 384         args->value = host1x_syncpt_read_min(sp);
 385         return 0;
 386 }
 387
 388 static int tegra_syncpt_incr(struct drm_device *drm, void *data,
 389                              struct drm_file *file)
 390 {
 391         struct drm_tegra_syncpt_incr *args = data;
 392         struct host1x *host = dev_get_drvdata(drm->dev);
 393         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 394
 395         if (!sp)
 396                 return -EINVAL;
 397
 398         return host1x_syncpt_incr(sp);
 399 }
 400
 401 static int tegra_syncpt_wait(struct drm_device *drm, void *data,
 402                              struct drm_file *file)
 403 {
 404         struct drm_tegra_syncpt_wait *args = data;
 405         struct host1x *host = dev_get_drvdata(drm->dev);
 406         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 407
 408         if (!sp)
 409                 return -EINVAL;
 410
 411         return host1x_syncpt_wait(sp, args->thresh, args->timeout,
 412                                   &args->value);
 413 }
 414
 415 static int tegra_open_channel(struct drm_device *drm, void *data,
 416                               struct drm_file *file)
 417 {
 418         struct tegra_drm_file *fpriv = file->driver_priv;
 419         struct tegra_drm *tegra = drm->dev_private;
 420         struct drm_tegra_open_channel *args = data;
 421         struct tegra_drm_context *context;
 422         struct host1x_client *client;
 423         int err = -ENODEV;
 424
 425         context = kzalloc(sizeof(*context), GFP_KERNEL);
 426         if (!context)
 427                 return -ENOMEM;
 428
 429         list_for_each_entry(client, &tegra->clients, list)
 430                 if (client->class == args->client) {
 431                         err = client->ops->open_channel(client, context);
 432                         if (err)
 433                                 break;
 434
 435                         context->client = client;
 436                         list_add(&context->list, &fpriv->contexts);
 437                         args->context = (uintptr_t)context;
 438                         return 0;
 439                 }
 440
 441         kfree(context);
 442         return err;
 443 }
 444
 445 static int tegra_close_channel(struct drm_device *drm, void *data,
 446                                struct drm_file *file)
 447 {
 448         struct drm_tegra_close_channel *args = data;
 449         struct tegra_drm_file *fpriv = file->driver_priv;
 450         struct tegra_drm_context *context;
 451
 452         context = tegra_drm_get_context(args->context);
 453
 454         if (!tegra_drm_file_owns_context(fpriv, context))
 455                 return -EINVAL;
 456
 457         list_del(&context->list);
 458         tegra_drm_context_free(context);
 459
 460         return 0;
 461 }
 462
 463 static int tegra_get_syncpt(struct drm_device *drm, void *data,
 464                             struct drm_file *file)
 465 {
 466         struct tegra_drm_file *fpriv = file->driver_priv;
 467         struct drm_tegra_get_syncpt *args = data;
 468         struct tegra_drm_context *context;
 469         struct host1x_syncpt *syncpt;
 470
 471         context = tegra_drm_get_context(args->context);
 472
 473         if (!tegra_drm_file_owns_context(fpriv, context))
 474                 return -ENODEV;
 475
 476         if (args->index >= context->client->num_syncpts)
 477                 return -EINVAL;
 478
 479         syncpt = context->client->syncpts[args->index];
 480         args->id = host1x_syncpt_id(syncpt);
 481
 482         return 0;
 483 }
 484
 485 static int tegra_submit(struct drm_device *drm, void *data,
 486                         struct drm_file *file)
 487 {
 488         struct tegra_drm_file *fpriv = file->driver_priv;
 489         struct drm_tegra_submit *args = data;
 490         struct tegra_drm_context *context;
 491
 492         context = tegra_drm_get_context(args->context);
 493
 494         if (!tegra_drm_file_owns_context(fpriv, context))
 495                 return -ENODEV;
 496
 497         return context->client->ops->submit(context, args, drm, file);
 498 }
 499 #endif
 500
 501 static const struct drm_ioctl_desc tegra_drm_ioctls[] = {
 502 #ifdef CONFIG_DRM_TEGRA_STAGING
 503         DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create, DRM_UNLOCKED | DRM_AUTH),
 504         DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap, DRM_UNLOCKED),
 505         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read, DRM_UNLOCKED),
 506         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr, DRM_UNLOCKED),
 507         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait, DRM_UNLOCKED),
 508         DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel, DRM_UNLOCKED),
 509         DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel, DRM_UNLOCKED),
 510         DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt, DRM_UNLOCKED),
 511         DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit, DRM_UNLOCKED),
 512 #endif
 513 };
 514
 515 static const struct file_operations tegra_drm_fops = {
 516         .owner = THIS_MODULE,
 517         .open = drm_open,
 518         .release = drm_release,
 519         .unlocked_ioctl = drm_ioctl,
 520         .mmap = tegra_drm_mmap,
 521         .poll = drm_poll,
 522         .read = drm_read,
 523 #ifdef CONFIG_COMPAT
 524         .compat_ioctl = drm_compat_ioctl,
 525 #endif
 526         .llseek = noop_llseek,
 527 };
 528
 529 static struct drm_crtc *tegra_crtc_from_pipe(struct drm_device *drm, int pipe)
 530 {
 531         struct drm_crtc *crtc;
 532
 533         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head) {
 534                 struct tegra_dc *dc = to_tegra_dc(crtc);
 535
 536                 if (dc->pipe == pipe)
 537                         return crtc;
 538         }
 539
 540         return NULL;
 541 }
 542
 543 static u32 tegra_drm_get_vblank_counter(struct drm_device *dev, int crtc)
 544 {
 545         /* TODO: implement real hardware counter using syncpoints */
 546         return drm_vblank_count(dev, crtc);
 547 }
 548
 549 static int tegra_drm_enable_vblank(struct drm_device *drm, int pipe)
 550 {
 551         struct drm_crtc *crtc = tegra_crtc_from_pipe(drm, pipe);
 552         struct tegra_dc *dc = to_tegra_dc(crtc);
 553
 554         if (!crtc)
 555                 return -ENODEV;
 556
 557         tegra_dc_enable_vblank(dc);
 558
 559         return 0;
 560 }
 561
 562 static void tegra_drm_disable_vblank(struct drm_device *drm, int pipe)
 563 {
 564         struct drm_crtc *crtc = tegra_crtc_from_pipe(drm, pipe);
 565         struct tegra_dc *dc = to_tegra_dc(crtc);
 566
 567         if (crtc)
 568                 tegra_dc_disable_vblank(dc);
 569 }
 570
 571 static void tegra_drm_preclose(struct drm_device *drm, struct drm_file *file)
 572 {
 573         struct tegra_drm_file *fpriv = file->driver_priv;
 574         struct tegra_drm_context *context, *tmp;
 575         struct drm_crtc *crtc;
 576
 577         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
 578                 tegra_dc_cancel_page_flip(crtc, file);
 579
 580         list_for_each_entry_safe(context, tmp, &fpriv->contexts, list)
 581                 tegra_drm_context_free(context);
 582
 583         kfree(fpriv);
 584 }
 585
 586 #ifdef CONFIG_DEBUG_FS
 587 static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
 588 {
 589         struct drm_info_node *node = (struct drm_info_node *)s->private;
 590         struct drm_device *drm = node->minor->dev;
 591         struct drm_framebuffer *fb;
 592
 593         mutex_lock(&drm->mode_config.fb_lock);
 594
 595         list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
 596                 seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
 597                            fb->base.id, fb->width, fb->height, fb->depth,
 598                            fb->bits_per_pixel,
 599                            atomic_read(&fb->refcount.refcount));
 600         }
 601
 602         mutex_unlock(&drm->mode_config.fb_lock);
 603
 604         return 0;
 605 }
 606
 607 static struct drm_info_list tegra_debugfs_list[] = {
 608         { "framebuffers", tegra_debugfs_framebuffers, 0 },
 609 };
 610
 611 static int tegra_debugfs_init(struct drm_minor *minor)
 612 {
 613         return drm_debugfs_create_files(tegra_debugfs_list,
 614                                         ARRAY_SIZE(tegra_debugfs_list),
 615                                         minor->debugfs_root, minor);
 616 }
 617
 618 static void tegra_debugfs_cleanup(struct drm_minor *minor)
 619 {
 620         drm_debugfs_remove_files(tegra_debugfs_list,
 621                                  ARRAY_SIZE(tegra_debugfs_list), minor);
 622 }
 623 #endif
 624
 625 struct drm_driver tegra_drm_driver = {
 626         .driver_features = DRIVER_MODESET | DRIVER_GEM,
 627         .load = tegra_drm_load,
 628         .unload = tegra_drm_unload,
 629         .open = tegra_drm_open,
 630         .preclose = tegra_drm_preclose,
 631         .lastclose = tegra_drm_lastclose,
 632
 633         .get_vblank_counter = tegra_drm_get_vblank_counter,
 634         .enable_vblank = tegra_drm_enable_vblank,
 635         .disable_vblank = tegra_drm_disable_vblank,
 636
 637 #if defined(CONFIG_DEBUG_FS)
 638         .debugfs_init = tegra_debugfs_init,
 639         .debugfs_cleanup = tegra_debugfs_cleanup,
 640 #endif
 641
 642         .gem_free_object = tegra_bo_free_object,
 643         .gem_vm_ops = &tegra_bo_vm_ops,
 644         .dumb_create = tegra_bo_dumb_create,
 645         .dumb_map_offset = tegra_bo_dumb_map_offset,
 646         .dumb_destroy = drm_gem_dumb_destroy,
 647
 648         .ioctls = tegra_drm_ioctls,
 649         .num_ioctls = ARRAY_SIZE(tegra_drm_ioctls),
 650         .fops = &tegra_drm_fops,
 651
 652         .name = DRIVER_NAME,
 653         .desc = DRIVER_DESC,
 654         .date = DRIVER_DATE,
 655         .major = DRIVER_MAJOR,
 656         .minor = DRIVER_MINOR,
 657         .patchlevel = DRIVER_PATCHLEVEL,
 658 };