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_drm_client {
  34         struct host1x_client *client;
  35         struct device_node *np;
  36         struct list_head list;
  37 };
  38
  39 static int host1x_add_drm_client(struct host1x_drm *host1x,
  40                                  struct device_node *np)
  41 {
  42         struct host1x_drm_client *client;
  43
  44         client = kzalloc(sizeof(*client), GFP_KERNEL);
  45         if (!client)
  46                 return -ENOMEM;
  47
  48         INIT_LIST_HEAD(&client->list);
  49         client->np = of_node_get(np);
  50
  51         list_add_tail(&client->list, &host1x->drm_clients);
  52
  53         return 0;
  54 }
  55
  56 static int host1x_activate_drm_client(struct host1x_drm *host1x,
  57                                       struct host1x_drm_client *drm,
  58                                       struct host1x_client *client)
  59 {
  60         mutex_lock(&host1x->drm_clients_lock);
  61         list_del_init(&drm->list);
  62         list_add_tail(&drm->list, &host1x->drm_active);
  63         drm->client = client;
  64         mutex_unlock(&host1x->drm_clients_lock);
  65
  66         return 0;
  67 }
  68
  69 static int host1x_remove_drm_client(struct host1x_drm *host1x,
  70                                     struct host1x_drm_client *client)
  71 {
  72         mutex_lock(&host1x->drm_clients_lock);
  73         list_del_init(&client->list);
  74         mutex_unlock(&host1x->drm_clients_lock);
  75
  76         of_node_put(client->np);
  77         kfree(client);
  78
  79         return 0;
  80 }
  81
  82 static int host1x_parse_dt(struct host1x_drm *host1x)
  83 {
  84         static const char * const compat[] = {
  85                 "nvidia,tegra20-dc",
  86                 "nvidia,tegra20-hdmi",
  87                 "nvidia,tegra20-gr2d",
  88                 "nvidia,tegra30-dc",
  89                 "nvidia,tegra30-hdmi",
  90                 "nvidia,tegra30-gr2d",
  91         };
  92         unsigned int i;
  93         int err;
  94
  95         for (i = 0; i < ARRAY_SIZE(compat); i++) {
  96                 struct device_node *np;
  97
  98                 for_each_child_of_node(host1x->dev->of_node, np) {
  99                         if (of_device_is_compatible(np, compat[i]) &&
 100                             of_device_is_available(np)) {
 101                                 err = host1x_add_drm_client(host1x, np);
 102                                 if (err < 0)
 103                                         return err;
 104                         }
 105                 }
 106         }
 107
 108         return 0;
 109 }
 110
 111 int host1x_drm_alloc(struct platform_device *pdev)
 112 {
 113         struct host1x_drm *host1x;
 114         int err;
 115
 116         host1x = devm_kzalloc(&pdev->dev, sizeof(*host1x), GFP_KERNEL);
 117         if (!host1x)
 118                 return -ENOMEM;
 119
 120         mutex_init(&host1x->drm_clients_lock);
 121         INIT_LIST_HEAD(&host1x->drm_clients);
 122         INIT_LIST_HEAD(&host1x->drm_active);
 123         mutex_init(&host1x->clients_lock);
 124         INIT_LIST_HEAD(&host1x->clients);
 125         host1x->dev = &pdev->dev;
 126
 127         err = host1x_parse_dt(host1x);
 128         if (err < 0) {
 129                 dev_err(&pdev->dev, "failed to parse DT: %d\n", err);
 130                 return err;
 131         }
 132
 133         host1x_set_drm_data(&pdev->dev, host1x);
 134
 135         return 0;
 136 }
 137
 138 int host1x_drm_init(struct host1x_drm *host1x, struct drm_device *drm)
 139 {
 140         struct host1x_client *client;
 141
 142         mutex_lock(&host1x->clients_lock);
 143
 144         list_for_each_entry(client, &host1x->clients, list) {
 145                 if (client->ops && client->ops->drm_init) {
 146                         int err = client->ops->drm_init(client, drm);
 147                         if (err < 0) {
 148                                 dev_err(host1x->dev,
 149                                         "DRM setup failed for %s: %d\n",
 150                                         dev_name(client->dev), err);
 151                                 mutex_unlock(&host1x->clients_lock);
 152                                 return err;
 153                         }
 154                 }
 155         }
 156
 157         mutex_unlock(&host1x->clients_lock);
 158
 159         return 0;
 160 }
 161
 162 int host1x_drm_exit(struct host1x_drm *host1x)
 163 {
 164         struct platform_device *pdev = to_platform_device(host1x->dev);
 165         struct host1x_client *client;
 166
 167         if (!host1x->drm)
 168                 return 0;
 169
 170         mutex_lock(&host1x->clients_lock);
 171
 172         list_for_each_entry_reverse(client, &host1x->clients, list) {
 173                 if (client->ops && client->ops->drm_exit) {
 174                         int err = client->ops->drm_exit(client);
 175                         if (err < 0) {
 176                                 dev_err(host1x->dev,
 177                                         "DRM cleanup failed for %s: %d\n",
 178                                         dev_name(client->dev), err);
 179                                 mutex_unlock(&host1x->clients_lock);
 180                                 return err;
 181                         }
 182                 }
 183         }
 184
 185         mutex_unlock(&host1x->clients_lock);
 186
 187         drm_platform_exit(&tegra_drm_driver, pdev);
 188         host1x->drm = NULL;
 189
 190         return 0;
 191 }
 192
 193 int host1x_register_client(struct host1x_drm *host1x,
 194                            struct host1x_client *client)
 195 {
 196         struct host1x_drm_client *drm, *tmp;
 197         int err;
 198
 199         mutex_lock(&host1x->clients_lock);
 200         list_add_tail(&client->list, &host1x->clients);
 201         mutex_unlock(&host1x->clients_lock);
 202
 203         list_for_each_entry_safe(drm, tmp, &host1x->drm_clients, list)
 204                 if (drm->np == client->dev->of_node)
 205                         host1x_activate_drm_client(host1x, drm, client);
 206
 207         if (list_empty(&host1x->drm_clients)) {
 208                 struct platform_device *pdev = to_platform_device(host1x->dev);
 209
 210                 err = drm_platform_init(&tegra_drm_driver, pdev);
 211                 if (err < 0) {
 212                         dev_err(host1x->dev, "drm_platform_init(): %d\n", err);
 213                         return err;
 214                 }
 215         }
 216
 217         return 0;
 218 }
 219
 220 int host1x_unregister_client(struct host1x_drm *host1x,
 221                              struct host1x_client *client)
 222 {
 223         struct host1x_drm_client *drm, *tmp;
 224         int err;
 225
 226         list_for_each_entry_safe(drm, tmp, &host1x->drm_active, list) {
 227                 if (drm->client == client) {
 228                         err = host1x_drm_exit(host1x);
 229                         if (err < 0) {
 230                                 dev_err(host1x->dev, "host1x_drm_exit(): %d\n",
 231                                         err);
 232                                 return err;
 233                         }
 234
 235                         host1x_remove_drm_client(host1x, drm);
 236                         break;
 237                 }
 238         }
 239
 240         mutex_lock(&host1x->clients_lock);
 241         list_del_init(&client->list);
 242         mutex_unlock(&host1x->clients_lock);
 243
 244         return 0;
 245 }
 246
 247 static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
 248 {
 249         struct host1x_drm *host1x;
 250         int err;
 251
 252         host1x = host1x_get_drm_data(drm->dev);
 253         drm->dev_private = host1x;
 254         host1x->drm = drm;
 255
 256         drm_mode_config_init(drm);
 257
 258         err = host1x_drm_init(host1x, drm);
 259         if (err < 0)
 260                 return err;
 261
 262         /*
 263          * We don't use the drm_irq_install() helpers provided by the DRM
 264          * core, so we need to set this manually in order to allow the
 265          * DRM_IOCTL_WAIT_VBLANK to operate correctly.
 266          */
 267         drm->irq_enabled = 1;
 268
 269         err = drm_vblank_init(drm, drm->mode_config.num_crtc);
 270         if (err < 0)
 271                 return err;
 272
 273         err = tegra_drm_fb_init(drm);
 274         if (err < 0)
 275                 return err;
 276
 277         drm_kms_helper_poll_init(drm);
 278
 279         return 0;
 280 }
 281
 282 static int tegra_drm_unload(struct drm_device *drm)
 283 {
 284         drm_kms_helper_poll_fini(drm);
 285         tegra_drm_fb_exit(drm);
 286
 287         drm_mode_config_cleanup(drm);
 288
 289         return 0;
 290 }
 291
 292 static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
 293 {
 294         struct host1x_drm_file *fpriv;
 295
 296         fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL);
 297         if (!fpriv)
 298                 return -ENOMEM;
 299
 300         INIT_LIST_HEAD(&fpriv->contexts);
 301         filp->driver_priv = fpriv;
 302
 303         return 0;
 304 }
 305
 306 static void host1x_drm_context_free(struct host1x_drm_context *context)
 307 {
 308         context->client->ops->close_channel(context);
 309         kfree(context);
 310 }
 311
 312 static void tegra_drm_lastclose(struct drm_device *drm)
 313 {
 314         struct host1x_drm *host1x = drm->dev_private;
 315
 316         tegra_fbdev_restore_mode(host1x->fbdev);
 317 }
 318
 319 #ifdef CONFIG_DRM_TEGRA_STAGING
 320 static bool host1x_drm_file_owns_context(struct host1x_drm_file *file,
 321                                          struct host1x_drm_context *context)
 322 {
 323         struct host1x_drm_context *ctx;
 324
 325         list_for_each_entry(ctx, &file->contexts, list)
 326                 if (ctx == context)
 327                         return true;
 328
 329         return false;
 330 }
 331
 332 static int tegra_gem_create(struct drm_device *drm, void *data,
 333                             struct drm_file *file)
 334 {
 335         struct drm_tegra_gem_create *args = data;
 336         struct tegra_bo *bo;
 337
 338         bo = tegra_bo_create_with_handle(file, drm, args->size,
 339                                          &args->handle);
 340         if (IS_ERR(bo))
 341                 return PTR_ERR(bo);
 342
 343         return 0;
 344 }
 345
 346 static int tegra_gem_mmap(struct drm_device *drm, void *data,
 347                           struct drm_file *file)
 348 {
 349         struct drm_tegra_gem_mmap *args = data;
 350         struct drm_gem_object *gem;
 351         struct tegra_bo *bo;
 352
 353         gem = drm_gem_object_lookup(drm, file, args->handle);
 354         if (!gem)
 355                 return -EINVAL;
 356
 357         bo = to_tegra_bo(gem);
 358
 359         args->offset = tegra_bo_get_mmap_offset(bo);
 360
 361         drm_gem_object_unreference(gem);
 362
 363         return 0;
 364 }
 365
 366 static int tegra_syncpt_read(struct drm_device *drm, void *data,
 367                              struct drm_file *file)
 368 {
 369         struct drm_tegra_syncpt_read *args = data;
 370         struct host1x *host = dev_get_drvdata(drm->dev);
 371         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 372
 373         if (!sp)
 374                 return -EINVAL;
 375
 376         args->value = host1x_syncpt_read_min(sp);
 377         return 0;
 378 }
 379
 380 static int tegra_syncpt_incr(struct drm_device *drm, void *data,
 381                              struct drm_file *file)
 382 {
 383         struct drm_tegra_syncpt_incr *args = data;
 384         struct host1x *host = dev_get_drvdata(drm->dev);
 385         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 386
 387         if (!sp)
 388                 return -EINVAL;
 389
 390         return host1x_syncpt_incr(sp);
 391 }
 392
 393 static int tegra_syncpt_wait(struct drm_device *drm, void *data,
 394                              struct drm_file *file)
 395 {
 396         struct drm_tegra_syncpt_wait *args = data;
 397         struct host1x *host = dev_get_drvdata(drm->dev);
 398         struct host1x_syncpt *sp = host1x_syncpt_get(host, args->id);
 399
 400         if (!sp)
 401                 return -EINVAL;
 402
 403         return host1x_syncpt_wait(sp, args->thresh, args->timeout,
 404                                   &args->value);
 405 }
 406
 407 static int tegra_open_channel(struct drm_device *drm, void *data,
 408                               struct drm_file *file)
 409 {
 410         struct drm_tegra_open_channel *args = data;
 411         struct host1x_client *client;
 412         struct host1x_drm_context *context;
 413         struct host1x_drm_file *fpriv = file->driver_priv;
 414         struct host1x_drm *host1x = drm->dev_private;
 415         int err = -ENODEV;
 416
 417         context = kzalloc(sizeof(*context), GFP_KERNEL);
 418         if (!context)
 419                 return -ENOMEM;
 420
 421         list_for_each_entry(client, &host1x->clients, list)
 422                 if (client->class == args->client) {
 423                         err = client->ops->open_channel(client, context);
 424                         if (err)
 425                                 break;
 426
 427                         context->client = client;
 428                         list_add(&context->list, &fpriv->contexts);
 429                         args->context = (uintptr_t)context;
 430                         return 0;
 431                 }
 432
 433         kfree(context);
 434         return err;
 435 }
 436
 437 static int tegra_close_channel(struct drm_device *drm, void *data,
 438                                struct drm_file *file)
 439 {
 440         struct drm_tegra_close_channel *args = data;
 441         struct host1x_drm_file *fpriv = file->driver_priv;
 442         struct host1x_drm_context *context =
 443                 (struct host1x_drm_context *)(uintptr_t)args->context;
 444
 445         if (!host1x_drm_file_owns_context(fpriv, context))
 446                 return -EINVAL;
 447
 448         list_del(&context->list);
 449         host1x_drm_context_free(context);
 450
 451         return 0;
 452 }
 453
 454 static int tegra_get_syncpt(struct drm_device *drm, void *data,
 455                             struct drm_file *file)
 456 {
 457         struct drm_tegra_get_syncpt *args = data;
 458         struct host1x_drm_file *fpriv = file->driver_priv;
 459         struct host1x_drm_context *context =
 460                 (struct host1x_drm_context *)(uintptr_t)args->context;
 461         struct host1x_syncpt *syncpt;
 462
 463         if (!host1x_drm_file_owns_context(fpriv, context))
 464                 return -ENODEV;
 465
 466         if (args->index >= context->client->num_syncpts)
 467                 return -EINVAL;
 468
 469         syncpt = context->client->syncpts[args->index];
 470         args->id = host1x_syncpt_id(syncpt);
 471
 472         return 0;
 473 }
 474
 475 static int tegra_submit(struct drm_device *drm, void *data,
 476                         struct drm_file *file)
 477 {
 478         struct drm_tegra_submit *args = data;
 479         struct host1x_drm_file *fpriv = file->driver_priv;
 480         struct host1x_drm_context *context =
 481                 (struct host1x_drm_context *)(uintptr_t)args->context;
 482
 483         if (!host1x_drm_file_owns_context(fpriv, context))
 484                 return -ENODEV;
 485
 486         return context->client->ops->submit(context, args, drm, file);
 487 }
 488 #endif
 489
 490 static struct drm_ioctl_desc tegra_drm_ioctls[] = {
 491 #ifdef CONFIG_DRM_TEGRA_STAGING
 492         DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create, DRM_UNLOCKED | DRM_AUTH),
 493         DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap, DRM_UNLOCKED),
 494         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read, DRM_UNLOCKED),
 495         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr, DRM_UNLOCKED),
 496         DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait, DRM_UNLOCKED),
 497         DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel, DRM_UNLOCKED),
 498         DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel, DRM_UNLOCKED),
 499         DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt, DRM_UNLOCKED),
 500         DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit, DRM_UNLOCKED),
 501 #endif
 502 };
 503
 504 static const struct file_operations tegra_drm_fops = {
 505         .owner = THIS_MODULE,
 506         .open = drm_open,
 507         .release = drm_release,
 508         .unlocked_ioctl = drm_ioctl,
 509         .mmap = tegra_drm_mmap,
 510         .poll = drm_poll,
 511         .fasync = drm_fasync,
 512         .read = drm_read,
 513 #ifdef CONFIG_COMPAT
 514         .compat_ioctl = drm_compat_ioctl,
 515 #endif
 516         .llseek = noop_llseek,
 517 };
 518
 519 static struct drm_crtc *tegra_crtc_from_pipe(struct drm_device *drm, int pipe)
 520 {
 521         struct drm_crtc *crtc;
 522
 523         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head) {
 524                 struct tegra_dc *dc = to_tegra_dc(crtc);
 525
 526                 if (dc->pipe == pipe)
 527                         return crtc;
 528         }
 529
 530         return NULL;
 531 }
 532
 533 static u32 tegra_drm_get_vblank_counter(struct drm_device *dev, int crtc)
 534 {
 535         /* TODO: implement real hardware counter using syncpoints */
 536         return drm_vblank_count(dev, crtc);
 537 }
 538
 539 static int tegra_drm_enable_vblank(struct drm_device *drm, int pipe)
 540 {
 541         struct drm_crtc *crtc = tegra_crtc_from_pipe(drm, pipe);
 542         struct tegra_dc *dc = to_tegra_dc(crtc);
 543
 544         if (!crtc)
 545                 return -ENODEV;
 546
 547         tegra_dc_enable_vblank(dc);
 548
 549         return 0;
 550 }
 551
 552 static void tegra_drm_disable_vblank(struct drm_device *drm, int pipe)
 553 {
 554         struct drm_crtc *crtc = tegra_crtc_from_pipe(drm, pipe);
 555         struct tegra_dc *dc = to_tegra_dc(crtc);
 556
 557         if (crtc)
 558                 tegra_dc_disable_vblank(dc);
 559 }
 560
 561 static void tegra_drm_preclose(struct drm_device *drm, struct drm_file *file)
 562 {
 563         struct host1x_drm_file *fpriv = file->driver_priv;
 564         struct host1x_drm_context *context, *tmp;
 565         struct drm_crtc *crtc;
 566
 567         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
 568                 tegra_dc_cancel_page_flip(crtc, file);
 569
 570         list_for_each_entry_safe(context, tmp, &fpriv->contexts, list)
 571                 host1x_drm_context_free(context);
 572
 573         kfree(fpriv);
 574 }
 575
 576 #ifdef CONFIG_DEBUG_FS
 577 static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
 578 {
 579         struct drm_info_node *node = (struct drm_info_node *)s->private;
 580         struct drm_device *drm = node->minor->dev;
 581         struct drm_framebuffer *fb;
 582
 583         mutex_lock(&drm->mode_config.fb_lock);
 584
 585         list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
 586                 seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
 587                            fb->base.id, fb->width, fb->height, fb->depth,
 588                            fb->bits_per_pixel,
 589                            atomic_read(&fb->refcount.refcount));
 590         }
 591
 592         mutex_unlock(&drm->mode_config.fb_lock);
 593
 594         return 0;
 595 }
 596
 597 static struct drm_info_list tegra_debugfs_list[] = {
 598         { "framebuffers", tegra_debugfs_framebuffers, 0 },
 599 };
 600
 601 static int tegra_debugfs_init(struct drm_minor *minor)
 602 {
 603         return drm_debugfs_create_files(tegra_debugfs_list,
 604                                         ARRAY_SIZE(tegra_debugfs_list),
 605                                         minor->debugfs_root, minor);
 606 }
 607
 608 static void tegra_debugfs_cleanup(struct drm_minor *minor)
 609 {
 610         drm_debugfs_remove_files(tegra_debugfs_list,
 611                                  ARRAY_SIZE(tegra_debugfs_list), minor);
 612 }
 613 #endif
 614
 615 struct drm_driver tegra_drm_driver = {
 616         .driver_features = DRIVER_MODESET | DRIVER_GEM,
 617         .load = tegra_drm_load,
 618         .unload = tegra_drm_unload,
 619         .open = tegra_drm_open,
 620         .preclose = tegra_drm_preclose,
 621         .lastclose = tegra_drm_lastclose,
 622
 623         .get_vblank_counter = tegra_drm_get_vblank_counter,
 624         .enable_vblank = tegra_drm_enable_vblank,
 625         .disable_vblank = tegra_drm_disable_vblank,
 626
 627 #if defined(CONFIG_DEBUG_FS)
 628         .debugfs_init = tegra_debugfs_init,
 629         .debugfs_cleanup = tegra_debugfs_cleanup,
 630 #endif
 631
 632         .gem_free_object = tegra_bo_free_object,
 633         .gem_vm_ops = &tegra_bo_vm_ops,
 634         .dumb_create = tegra_bo_dumb_create,
 635         .dumb_map_offset = tegra_bo_dumb_map_offset,
 636         .dumb_destroy = drm_gem_dumb_destroy,
 637
 638         .ioctls = tegra_drm_ioctls,
 639         .num_ioctls = ARRAY_SIZE(tegra_drm_ioctls),
 640         .fops = &tegra_drm_fops,
 641
 642         .name = DRIVER_NAME,
 643         .desc = DRIVER_DESC,
 644         .date = DRIVER_DATE,
 645         .major = DRIVER_MAJOR,
 646         .minor = DRIVER_MINOR,
 647         .patchlevel = DRIVER_PATCHLEVEL,
 648 };