drivers/gpu/drm/etnaviv/etnaviv_drv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2015-2018 Etnaviv Project
   4  */
   5
   6 #include <linux/component.h>
   7 #include <linux/dma-mapping.h>
   8 #include <linux/module.h>
   9 #include <linux/of_platform.h>
  10 #include <linux/uaccess.h>
  11
  12 #include <drm/drm_debugfs.h>
  13 #include <drm/drm_drv.h>
  14 #include <drm/drm_file.h>
  15 #include <drm/drm_ioctl.h>
  16 #include <drm/drm_of.h>
  17 #include <drm/drm_prime.h>
  18
  19 #include "etnaviv_cmdbuf.h"
  20 #include "etnaviv_drv.h"
  21 #include "etnaviv_gpu.h"
  22 #include "etnaviv_gem.h"
  23 #include "etnaviv_mmu.h"
  24 #include "etnaviv_perfmon.h"
  25
  26 /*
  27  * DRM operations:
  28  */
  29
  30
  31 static void load_gpu(struct drm_device *dev)
  32 {
  33         struct etnaviv_drm_private *priv = dev->dev_private;
  34         unsigned int i;
  35
  36         for (i = 0; i < ETNA_MAX_PIPES; i++) {
  37                 struct etnaviv_gpu *g = priv->gpu[i];
  38
  39                 if (g) {
  40                         int ret;
  41
  42                         ret = etnaviv_gpu_init(g);
  43                         if (ret)
  44                                 priv->gpu[i] = NULL;
  45                 }
  46         }
  47 }
  48
  49 static int etnaviv_open(struct drm_device *dev, struct drm_file *file)
  50 {
  51         struct etnaviv_drm_private *priv = dev->dev_private;
  52         struct etnaviv_file_private *ctx;
  53         int ret, i;
  54
  55         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
  56         if (!ctx)
  57                 return -ENOMEM;
  58
  59         ctx->mmu = etnaviv_iommu_context_init(priv->mmu_global,
  60                                               priv->cmdbuf_suballoc);
  61         if (!ctx->mmu) {
  62                 ret = -ENOMEM;
  63                 goto out_free;
  64         }
  65
  66         for (i = 0; i < ETNA_MAX_PIPES; i++) {
  67                 struct etnaviv_gpu *gpu = priv->gpu[i];
  68                 struct drm_gpu_scheduler *sched;
  69
  70                 if (gpu) {
  71                         sched = &gpu->sched;
  72                         drm_sched_entity_init(&ctx->sched_entity[i],
  73                                               DRM_SCHED_PRIORITY_NORMAL, &sched,
  74                                               1, NULL);
  75                         }
  76         }
  77
  78         file->driver_priv = ctx;
  79
  80         return 0;
  81
  82 out_free:
  83         kfree(ctx);
  84         return ret;
  85 }
  86
  87 static void etnaviv_postclose(struct drm_device *dev, struct drm_file *file)
  88 {
  89         struct etnaviv_drm_private *priv = dev->dev_private;
  90         struct etnaviv_file_private *ctx = file->driver_priv;
  91         unsigned int i;
  92
  93         for (i = 0; i < ETNA_MAX_PIPES; i++) {
  94                 struct etnaviv_gpu *gpu = priv->gpu[i];
  95
  96                 if (gpu)
  97                         drm_sched_entity_destroy(&ctx->sched_entity[i]);
  98         }
  99
 100         etnaviv_iommu_context_put(ctx->mmu);
 101
 102         kfree(ctx);
 103 }
 104
 105 /*
 106  * DRM debugfs:
 107  */
 108
 109 #ifdef CONFIG_DEBUG_FS
 110 static int etnaviv_gem_show(struct drm_device *dev, struct seq_file *m)
 111 {
 112         struct etnaviv_drm_private *priv = dev->dev_private;
 113
 114         etnaviv_gem_describe_objects(priv, m);
 115
 116         return 0;
 117 }
 118
 119 static int etnaviv_mm_show(struct drm_device *dev, struct seq_file *m)
 120 {
 121         struct drm_printer p = drm_seq_file_printer(m);
 122
 123         read_lock(&dev->vma_offset_manager->vm_lock);
 124         drm_mm_print(&dev->vma_offset_manager->vm_addr_space_mm, &p);
 125         read_unlock(&dev->vma_offset_manager->vm_lock);
 126
 127         return 0;
 128 }
 129
 130 static int etnaviv_mmu_show(struct etnaviv_gpu *gpu, struct seq_file *m)
 131 {
 132         struct drm_printer p = drm_seq_file_printer(m);
 133         struct etnaviv_iommu_context *mmu_context;
 134
 135         seq_printf(m, "Active Objects (%s):\n", dev_name(gpu->dev));
 136
 137         /*
 138          * Lock the GPU to avoid a MMU context switch just now and elevate
 139          * the refcount of the current context to avoid it disappearing from
 140          * under our feet.
 141          */
 142         mutex_lock(&gpu->lock);
 143         mmu_context = gpu->mmu_context;
 144         if (mmu_context)
 145                 etnaviv_iommu_context_get(mmu_context);
 146         mutex_unlock(&gpu->lock);
 147
 148         if (!mmu_context)
 149                 return 0;
 150
 151         mutex_lock(&mmu_context->lock);
 152         drm_mm_print(&mmu_context->mm, &p);
 153         mutex_unlock(&mmu_context->lock);
 154
 155         etnaviv_iommu_context_put(mmu_context);
 156
 157         return 0;
 158 }
 159
 160 static void etnaviv_buffer_dump(struct etnaviv_gpu *gpu, struct seq_file *m)
 161 {
 162         struct etnaviv_cmdbuf *buf = &gpu->buffer;
 163         u32 size = buf->size;
 164         u32 *ptr = buf->vaddr;
 165         u32 i;
 166
 167         seq_printf(m, "virt %p - phys 0x%llx - free 0x%08x\n",
 168                         buf->vaddr, (u64)etnaviv_cmdbuf_get_pa(buf),
 169                         size - buf->user_size);
 170
 171         for (i = 0; i < size / 4; i++) {
 172                 if (i && !(i % 4))
 173                         seq_puts(m, "\n");
 174                 if (i % 4 == 0)
 175                         seq_printf(m, "\t0x%p: ", ptr + i);
 176                 seq_printf(m, "%08x ", *(ptr + i));
 177         }
 178         seq_puts(m, "\n");
 179 }
 180
 181 static int etnaviv_ring_show(struct etnaviv_gpu *gpu, struct seq_file *m)
 182 {
 183         seq_printf(m, "Ring Buffer (%s): ", dev_name(gpu->dev));
 184
 185         mutex_lock(&gpu->lock);
 186         etnaviv_buffer_dump(gpu, m);
 187         mutex_unlock(&gpu->lock);
 188
 189         return 0;
 190 }
 191
 192 static int show_unlocked(struct seq_file *m, void *arg)
 193 {
 194         struct drm_info_node *node = (struct drm_info_node *) m->private;
 195         struct drm_device *dev = node->minor->dev;
 196         int (*show)(struct drm_device *dev, struct seq_file *m) =
 197                         node->info_ent->data;
 198
 199         return show(dev, m);
 200 }
 201
 202 static int show_each_gpu(struct seq_file *m, void *arg)
 203 {
 204         struct drm_info_node *node = (struct drm_info_node *) m->private;
 205         struct drm_device *dev = node->minor->dev;
 206         struct etnaviv_drm_private *priv = dev->dev_private;
 207         struct etnaviv_gpu *gpu;
 208         int (*show)(struct etnaviv_gpu *gpu, struct seq_file *m) =
 209                         node->info_ent->data;
 210         unsigned int i;
 211         int ret = 0;
 212
 213         for (i = 0; i < ETNA_MAX_PIPES; i++) {
 214                 gpu = priv->gpu[i];
 215                 if (!gpu)
 216                         continue;
 217
 218                 ret = show(gpu, m);
 219                 if (ret < 0)
 220                         break;
 221         }
 222
 223         return ret;
 224 }
 225
 226 static struct drm_info_list etnaviv_debugfs_list[] = {
 227                 {"gpu", show_each_gpu, 0, etnaviv_gpu_debugfs},
 228                 {"gem", show_unlocked, 0, etnaviv_gem_show},
 229                 { "mm", show_unlocked, 0, etnaviv_mm_show },
 230                 {"mmu", show_each_gpu, 0, etnaviv_mmu_show},
 231                 {"ring", show_each_gpu, 0, etnaviv_ring_show},
 232 };
 233
 234 static void etnaviv_debugfs_init(struct drm_minor *minor)
 235 {
 236         drm_debugfs_create_files(etnaviv_debugfs_list,
 237                                  ARRAY_SIZE(etnaviv_debugfs_list),
 238                                  minor->debugfs_root, minor);
 239 }
 240 #endif
 241
 242 /*
 243  * DRM ioctls:
 244  */
 245
 246 static int etnaviv_ioctl_get_param(struct drm_device *dev, void *data,
 247                 struct drm_file *file)
 248 {
 249         struct etnaviv_drm_private *priv = dev->dev_private;
 250         struct drm_etnaviv_param *args = data;
 251         struct etnaviv_gpu *gpu;
 252
 253         if (args->pipe >= ETNA_MAX_PIPES)
 254                 return -EINVAL;
 255
 256         gpu = priv->gpu[args->pipe];
 257         if (!gpu)
 258                 return -ENXIO;
 259
 260         return etnaviv_gpu_get_param(gpu, args->param, &args->value);
 261 }
 262
 263 static int etnaviv_ioctl_gem_new(struct drm_device *dev, void *data,
 264                 struct drm_file *file)
 265 {
 266         struct drm_etnaviv_gem_new *args = data;
 267
 268         if (args->flags & ~(ETNA_BO_CACHED | ETNA_BO_WC | ETNA_BO_UNCACHED |
 269                             ETNA_BO_FORCE_MMU))
 270                 return -EINVAL;
 271
 272         return etnaviv_gem_new_handle(dev, file, args->size,
 273                         args->flags, &args->handle);
 274 }
 275
 276 static int etnaviv_ioctl_gem_cpu_prep(struct drm_device *dev, void *data,
 277                 struct drm_file *file)
 278 {
 279         struct drm_etnaviv_gem_cpu_prep *args = data;
 280         struct drm_gem_object *obj;
 281         int ret;
 282
 283         if (args->op & ~(ETNA_PREP_READ | ETNA_PREP_WRITE | ETNA_PREP_NOSYNC))
 284                 return -EINVAL;
 285
 286         obj = drm_gem_object_lookup(file, args->handle);
 287         if (!obj)
 288                 return -ENOENT;
 289
 290         ret = etnaviv_gem_cpu_prep(obj, args->op, &args->timeout);
 291
 292         drm_gem_object_put(obj);
 293
 294         return ret;
 295 }
 296
 297 static int etnaviv_ioctl_gem_cpu_fini(struct drm_device *dev, void *data,
 298                 struct drm_file *file)
 299 {
 300         struct drm_etnaviv_gem_cpu_fini *args = data;
 301         struct drm_gem_object *obj;
 302         int ret;
 303
 304         if (args->flags)
 305                 return -EINVAL;
 306
 307         obj = drm_gem_object_lookup(file, args->handle);
 308         if (!obj)
 309                 return -ENOENT;
 310
 311         ret = etnaviv_gem_cpu_fini(obj);
 312
 313         drm_gem_object_put(obj);
 314
 315         return ret;
 316 }
 317
 318 static int etnaviv_ioctl_gem_info(struct drm_device *dev, void *data,
 319                 struct drm_file *file)
 320 {
 321         struct drm_etnaviv_gem_info *args = data;
 322         struct drm_gem_object *obj;
 323         int ret;
 324
 325         if (args->pad)
 326                 return -EINVAL;
 327
 328         obj = drm_gem_object_lookup(file, args->handle);
 329         if (!obj)
 330                 return -ENOENT;
 331
 332         ret = etnaviv_gem_mmap_offset(obj, &args->offset);
 333         drm_gem_object_put(obj);
 334
 335         return ret;
 336 }
 337
 338 static int etnaviv_ioctl_wait_fence(struct drm_device *dev, void *data,
 339                 struct drm_file *file)
 340 {
 341         struct drm_etnaviv_wait_fence *args = data;
 342         struct etnaviv_drm_private *priv = dev->dev_private;
 343         struct drm_etnaviv_timespec *timeout = &args->timeout;
 344         struct etnaviv_gpu *gpu;
 345
 346         if (args->flags & ~(ETNA_WAIT_NONBLOCK))
 347                 return -EINVAL;
 348
 349         if (args->pipe >= ETNA_MAX_PIPES)
 350                 return -EINVAL;
 351
 352         gpu = priv->gpu[args->pipe];
 353         if (!gpu)
 354                 return -ENXIO;
 355
 356         if (args->flags & ETNA_WAIT_NONBLOCK)
 357                 timeout = NULL;
 358
 359         return etnaviv_gpu_wait_fence_interruptible(gpu, args->fence,
 360                                                     timeout);
 361 }
 362
 363 static int etnaviv_ioctl_gem_userptr(struct drm_device *dev, void *data,
 364         struct drm_file *file)
 365 {
 366         struct drm_etnaviv_gem_userptr *args = data;
 367
 368         if (args->flags & ~(ETNA_USERPTR_READ|ETNA_USERPTR_WRITE) ||
 369             args->flags == 0)
 370                 return -EINVAL;
 371
 372         if (offset_in_page(args->user_ptr | args->user_size) ||
 373             (uintptr_t)args->user_ptr != args->user_ptr ||
 374             (u32)args->user_size != args->user_size ||
 375             args->user_ptr & ~PAGE_MASK)
 376                 return -EINVAL;
 377
 378         if (!access_ok((void __user *)(unsigned long)args->user_ptr,
 379                        args->user_size))
 380                 return -EFAULT;
 381
 382         return etnaviv_gem_new_userptr(dev, file, args->user_ptr,
 383                                        args->user_size, args->flags,
 384                                        &args->handle);
 385 }
 386
 387 static int etnaviv_ioctl_gem_wait(struct drm_device *dev, void *data,
 388         struct drm_file *file)
 389 {
 390         struct etnaviv_drm_private *priv = dev->dev_private;
 391         struct drm_etnaviv_gem_wait *args = data;
 392         struct drm_etnaviv_timespec *timeout = &args->timeout;
 393         struct drm_gem_object *obj;
 394         struct etnaviv_gpu *gpu;
 395         int ret;
 396
 397         if (args->flags & ~(ETNA_WAIT_NONBLOCK))
 398                 return -EINVAL;
 399
 400         if (args->pipe >= ETNA_MAX_PIPES)
 401                 return -EINVAL;
 402
 403         gpu = priv->gpu[args->pipe];
 404         if (!gpu)
 405                 return -ENXIO;
 406
 407         obj = drm_gem_object_lookup(file, args->handle);
 408         if (!obj)
 409                 return -ENOENT;
 410
 411         if (args->flags & ETNA_WAIT_NONBLOCK)
 412                 timeout = NULL;
 413
 414         ret = etnaviv_gem_wait_bo(gpu, obj, timeout);
 415
 416         drm_gem_object_put(obj);
 417
 418         return ret;
 419 }
 420
 421 static int etnaviv_ioctl_pm_query_dom(struct drm_device *dev, void *data,
 422         struct drm_file *file)
 423 {
 424         struct etnaviv_drm_private *priv = dev->dev_private;
 425         struct drm_etnaviv_pm_domain *args = data;
 426         struct etnaviv_gpu *gpu;
 427
 428         if (args->pipe >= ETNA_MAX_PIPES)
 429                 return -EINVAL;
 430
 431         gpu = priv->gpu[args->pipe];
 432         if (!gpu)
 433                 return -ENXIO;
 434
 435         return etnaviv_pm_query_dom(gpu, args);
 436 }
 437
 438 static int etnaviv_ioctl_pm_query_sig(struct drm_device *dev, void *data,
 439         struct drm_file *file)
 440 {
 441         struct etnaviv_drm_private *priv = dev->dev_private;
 442         struct drm_etnaviv_pm_signal *args = data;
 443         struct etnaviv_gpu *gpu;
 444
 445         if (args->pipe >= ETNA_MAX_PIPES)
 446                 return -EINVAL;
 447
 448         gpu = priv->gpu[args->pipe];
 449         if (!gpu)
 450                 return -ENXIO;
 451
 452         return etnaviv_pm_query_sig(gpu, args);
 453 }
 454
 455 static const struct drm_ioctl_desc etnaviv_ioctls[] = {
 456 #define ETNA_IOCTL(n, func, flags) \
 457         DRM_IOCTL_DEF_DRV(ETNAVIV_##n, etnaviv_ioctl_##func, flags)
 458         ETNA_IOCTL(GET_PARAM,    get_param,    DRM_RENDER_ALLOW),
 459         ETNA_IOCTL(GEM_NEW,      gem_new,      DRM_RENDER_ALLOW),
 460         ETNA_IOCTL(GEM_INFO,     gem_info,     DRM_RENDER_ALLOW),
 461         ETNA_IOCTL(GEM_CPU_PREP, gem_cpu_prep, DRM_RENDER_ALLOW),
 462         ETNA_IOCTL(GEM_CPU_FINI, gem_cpu_fini, DRM_RENDER_ALLOW),
 463         ETNA_IOCTL(GEM_SUBMIT,   gem_submit,   DRM_RENDER_ALLOW),
 464         ETNA_IOCTL(WAIT_FENCE,   wait_fence,   DRM_RENDER_ALLOW),
 465         ETNA_IOCTL(GEM_USERPTR,  gem_userptr,  DRM_RENDER_ALLOW),
 466         ETNA_IOCTL(GEM_WAIT,     gem_wait,     DRM_RENDER_ALLOW),
 467         ETNA_IOCTL(PM_QUERY_DOM, pm_query_dom, DRM_RENDER_ALLOW),
 468         ETNA_IOCTL(PM_QUERY_SIG, pm_query_sig, DRM_RENDER_ALLOW),
 469 };
 470
 471 static const struct file_operations fops = {
 472         .owner              = THIS_MODULE,
 473         .open               = drm_open,
 474         .release            = drm_release,
 475         .unlocked_ioctl     = drm_ioctl,
 476         .compat_ioctl       = drm_compat_ioctl,
 477         .poll               = drm_poll,
 478         .read               = drm_read,
 479         .llseek             = no_llseek,
 480         .mmap               = etnaviv_gem_mmap,
 481 };
 482
 483 static const struct drm_driver etnaviv_drm_driver = {
 484         .driver_features    = DRIVER_GEM | DRIVER_RENDER,
 485         .open               = etnaviv_open,
 486         .postclose           = etnaviv_postclose,
 487         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 488         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 489         .gem_prime_import_sg_table = etnaviv_gem_prime_import_sg_table,
 490         .gem_prime_mmap     = etnaviv_gem_prime_mmap,
 491 #ifdef CONFIG_DEBUG_FS
 492         .debugfs_init       = etnaviv_debugfs_init,
 493 #endif
 494         .ioctls             = etnaviv_ioctls,
 495         .num_ioctls         = DRM_ETNAVIV_NUM_IOCTLS,
 496         .fops               = &fops,
 497         .name               = "etnaviv",
 498         .desc               = "etnaviv DRM",
 499         .date               = "20151214",
 500         .major              = 1,
 501         .minor              = 3,
 502 };
 503
 504 /*
 505  * Platform driver:
 506  */
 507 static int etnaviv_bind(struct device *dev)
 508 {
 509         struct etnaviv_drm_private *priv;
 510         struct drm_device *drm;
 511         int ret;
 512
 513         drm = drm_dev_alloc(&etnaviv_drm_driver, dev);
 514         if (IS_ERR(drm))
 515                 return PTR_ERR(drm);
 516
 517         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 518         if (!priv) {
 519                 dev_err(dev, "failed to allocate private data\n");
 520                 ret = -ENOMEM;
 521                 goto out_put;
 522         }
 523         drm->dev_private = priv;
 524
 525         dma_set_max_seg_size(dev, SZ_2G);
 526
 527         mutex_init(&priv->gem_lock);
 528         INIT_LIST_HEAD(&priv->gem_list);
 529         priv->num_gpus = 0;
 530         priv->shm_gfp_mask = GFP_HIGHUSER | __GFP_RETRY_MAYFAIL | __GFP_NOWARN;
 531
 532         priv->cmdbuf_suballoc = etnaviv_cmdbuf_suballoc_new(drm->dev);
 533         if (IS_ERR(priv->cmdbuf_suballoc)) {
 534                 dev_err(drm->dev, "Failed to create cmdbuf suballocator\n");
 535                 ret = PTR_ERR(priv->cmdbuf_suballoc);
 536                 goto out_free_priv;
 537         }
 538
 539         dev_set_drvdata(dev, drm);
 540
 541         ret = component_bind_all(dev, drm);
 542         if (ret < 0)
 543                 goto out_destroy_suballoc;
 544
 545         load_gpu(drm);
 546
 547         ret = drm_dev_register(drm, 0);
 548         if (ret)
 549                 goto out_unbind;
 550
 551         return 0;
 552
 553 out_unbind:
 554         component_unbind_all(dev, drm);
 555 out_destroy_suballoc:
 556         etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
 557 out_free_priv:
 558         kfree(priv);
 559 out_put:
 560         drm_dev_put(drm);
 561
 562         return ret;
 563 }
 564
 565 static void etnaviv_unbind(struct device *dev)
 566 {
 567         struct drm_device *drm = dev_get_drvdata(dev);
 568         struct etnaviv_drm_private *priv = drm->dev_private;
 569
 570         drm_dev_unregister(drm);
 571
 572         component_unbind_all(dev, drm);
 573
 574         etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
 575
 576         drm->dev_private = NULL;
 577         kfree(priv);
 578
 579         drm_dev_put(drm);
 580 }
 581
 582 static const struct component_master_ops etnaviv_master_ops = {
 583         .bind = etnaviv_bind,
 584         .unbind = etnaviv_unbind,
 585 };
 586
 587 static int compare_of(struct device *dev, void *data)
 588 {
 589         struct device_node *np = data;
 590
 591         return dev->of_node == np;
 592 }
 593
 594 static int compare_str(struct device *dev, void *data)
 595 {
 596         return !strcmp(dev_name(dev), data);
 597 }
 598
 599 static int etnaviv_pdev_probe(struct platform_device *pdev)
 600 {
 601         struct device *dev = &pdev->dev;
 602         struct component_match *match = NULL;
 603
 604         if (!dev->platform_data) {
 605                 struct device_node *core_node;
 606
 607                 for_each_compatible_node(core_node, NULL, "vivante,gc") {
 608                         if (!of_device_is_available(core_node))
 609                                 continue;
 610
 611                         drm_of_component_match_add(&pdev->dev, &match,
 612                                                    compare_of, core_node);
 613                 }
 614         } else {
 615                 char **names = dev->platform_data;
 616                 unsigned i;
 617
 618                 for (i = 0; names[i]; i++)
 619                         component_match_add(dev, &match, compare_str, names[i]);
 620         }
 621
 622         return component_master_add_with_match(dev, &etnaviv_master_ops, match);
 623 }
 624
 625 static int etnaviv_pdev_remove(struct platform_device *pdev)
 626 {
 627         component_master_del(&pdev->dev, &etnaviv_master_ops);
 628
 629         return 0;
 630 }
 631
 632 static struct platform_driver etnaviv_platform_driver = {
 633         .probe      = etnaviv_pdev_probe,
 634         .remove     = etnaviv_pdev_remove,
 635         .driver     = {
 636                 .name   = "etnaviv",
 637         },
 638 };
 639
 640 static struct platform_device *etnaviv_drm;
 641
 642 static int __init etnaviv_init(void)
 643 {
 644         struct platform_device *pdev;
 645         int ret;
 646         struct device_node *np;
 647
 648         etnaviv_validate_init();
 649
 650         ret = platform_driver_register(&etnaviv_gpu_driver);
 651         if (ret != 0)
 652                 return ret;
 653
 654         ret = platform_driver_register(&etnaviv_platform_driver);
 655         if (ret != 0)
 656                 goto unregister_gpu_driver;
 657
 658         /*
 659          * If the DT contains at least one available GPU device, instantiate
 660          * the DRM platform device.
 661          */
 662         for_each_compatible_node(np, NULL, "vivante,gc") {
 663                 if (!of_device_is_available(np))
 664                         continue;
 665
 666                 pdev = platform_device_alloc("etnaviv", -1);
 667                 if (!pdev) {
 668                         ret = -ENOMEM;
 669                         of_node_put(np);
 670                         goto unregister_platform_driver;
 671                 }
 672                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(40);
 673                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 674
 675                 /*
 676                  * Apply the same DMA configuration to the virtual etnaviv
 677                  * device as the GPU we found. This assumes that all Vivante
 678                  * GPUs in the system share the same DMA constraints.
 679                  */
 680                 of_dma_configure(&pdev->dev, np, true);
 681
 682                 ret = platform_device_add(pdev);
 683                 if (ret) {
 684                         platform_device_put(pdev);
 685                         of_node_put(np);
 686                         goto unregister_platform_driver;
 687                 }
 688
 689                 etnaviv_drm = pdev;
 690                 of_node_put(np);
 691                 break;
 692         }
 693
 694         return 0;
 695
 696 unregister_platform_driver:
 697         platform_driver_unregister(&etnaviv_platform_driver);
 698 unregister_gpu_driver:
 699         platform_driver_unregister(&etnaviv_gpu_driver);
 700         return ret;
 701 }
 702 module_init(etnaviv_init);
 703
 704 static void __exit etnaviv_exit(void)
 705 {
 706         platform_device_unregister(etnaviv_drm);
 707         platform_driver_unregister(&etnaviv_platform_driver);
 708         platform_driver_unregister(&etnaviv_gpu_driver);
 709 }
 710 module_exit(etnaviv_exit);
 711
 712 MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>");
 713 MODULE_AUTHOR("Russell King <rmk+kernel@armlinux.org.uk>");
 714 MODULE_AUTHOR("Lucas Stach <l.stach@pengutronix.de>");
 715 MODULE_DESCRIPTION("etnaviv DRM Driver");
 716 MODULE_LICENSE("GPL v2");
 717 MODULE_ALIAS("platform:etnaviv");