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