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 int etnaviv_debugfs_init(struct drm_minor *minor)
 235 {
 236         struct drm_device *dev = minor->dev;
 237         int ret;
 238
 239         ret = drm_debugfs_create_files(etnaviv_debugfs_list,
 240                         ARRAY_SIZE(etnaviv_debugfs_list),
 241                         minor->debugfs_root, minor);
 242
 243         if (ret) {
 244                 dev_err(dev->dev, "could not install etnaviv_debugfs_list\n");
 245                 return ret;
 246         }
 247
 248         return ret;
 249 }
 250 #endif
 251
 252 /*
 253  * DRM ioctls:
 254  */
 255
 256 static int etnaviv_ioctl_get_param(struct drm_device *dev, void *data,
 257                 struct drm_file *file)
 258 {
 259         struct etnaviv_drm_private *priv = dev->dev_private;
 260         struct drm_etnaviv_param *args = data;
 261         struct etnaviv_gpu *gpu;
 262
 263         if (args->pipe >= ETNA_MAX_PIPES)
 264                 return -EINVAL;
 265
 266         gpu = priv->gpu[args->pipe];
 267         if (!gpu)
 268                 return -ENXIO;
 269
 270         return etnaviv_gpu_get_param(gpu, args->param, &args->value);
 271 }
 272
 273 static int etnaviv_ioctl_gem_new(struct drm_device *dev, void *data,
 274                 struct drm_file *file)
 275 {
 276         struct drm_etnaviv_gem_new *args = data;
 277
 278         if (args->flags & ~(ETNA_BO_CACHED | ETNA_BO_WC | ETNA_BO_UNCACHED |
 279                             ETNA_BO_FORCE_MMU))
 280                 return -EINVAL;
 281
 282         return etnaviv_gem_new_handle(dev, file, args->size,
 283                         args->flags, &args->handle);
 284 }
 285
 286 static int etnaviv_ioctl_gem_cpu_prep(struct drm_device *dev, void *data,
 287                 struct drm_file *file)
 288 {
 289         struct drm_etnaviv_gem_cpu_prep *args = data;
 290         struct drm_gem_object *obj;
 291         int ret;
 292
 293         if (args->op & ~(ETNA_PREP_READ | ETNA_PREP_WRITE | ETNA_PREP_NOSYNC))
 294                 return -EINVAL;
 295
 296         obj = drm_gem_object_lookup(file, args->handle);
 297         if (!obj)
 298                 return -ENOENT;
 299
 300         ret = etnaviv_gem_cpu_prep(obj, args->op, &args->timeout);
 301
 302         drm_gem_object_put_unlocked(obj);
 303
 304         return ret;
 305 }
 306
 307 static int etnaviv_ioctl_gem_cpu_fini(struct drm_device *dev, void *data,
 308                 struct drm_file *file)
 309 {
 310         struct drm_etnaviv_gem_cpu_fini *args = data;
 311         struct drm_gem_object *obj;
 312         int ret;
 313
 314         if (args->flags)
 315                 return -EINVAL;
 316
 317         obj = drm_gem_object_lookup(file, args->handle);
 318         if (!obj)
 319                 return -ENOENT;
 320
 321         ret = etnaviv_gem_cpu_fini(obj);
 322
 323         drm_gem_object_put_unlocked(obj);
 324
 325         return ret;
 326 }
 327
 328 static int etnaviv_ioctl_gem_info(struct drm_device *dev, void *data,
 329                 struct drm_file *file)
 330 {
 331         struct drm_etnaviv_gem_info *args = data;
 332         struct drm_gem_object *obj;
 333         int ret;
 334
 335         if (args->pad)
 336                 return -EINVAL;
 337
 338         obj = drm_gem_object_lookup(file, args->handle);
 339         if (!obj)
 340                 return -ENOENT;
 341
 342         ret = etnaviv_gem_mmap_offset(obj, &args->offset);
 343         drm_gem_object_put_unlocked(obj);
 344
 345         return ret;
 346 }
 347
 348 static int etnaviv_ioctl_wait_fence(struct drm_device *dev, void *data,
 349                 struct drm_file *file)
 350 {
 351         struct drm_etnaviv_wait_fence *args = data;
 352         struct etnaviv_drm_private *priv = dev->dev_private;
 353         struct drm_etnaviv_timespec *timeout = &args->timeout;
 354         struct etnaviv_gpu *gpu;
 355
 356         if (args->flags & ~(ETNA_WAIT_NONBLOCK))
 357                 return -EINVAL;
 358
 359         if (args->pipe >= ETNA_MAX_PIPES)
 360                 return -EINVAL;
 361
 362         gpu = priv->gpu[args->pipe];
 363         if (!gpu)
 364                 return -ENXIO;
 365
 366         if (args->flags & ETNA_WAIT_NONBLOCK)
 367                 timeout = NULL;
 368
 369         return etnaviv_gpu_wait_fence_interruptible(gpu, args->fence,
 370                                                     timeout);
 371 }
 372
 373 static int etnaviv_ioctl_gem_userptr(struct drm_device *dev, void *data,
 374         struct drm_file *file)
 375 {
 376         struct drm_etnaviv_gem_userptr *args = data;
 377
 378         if (args->flags & ~(ETNA_USERPTR_READ|ETNA_USERPTR_WRITE) ||
 379             args->flags == 0)
 380                 return -EINVAL;
 381
 382         if (offset_in_page(args->user_ptr | args->user_size) ||
 383             (uintptr_t)args->user_ptr != args->user_ptr ||
 384             (u32)args->user_size != args->user_size ||
 385             args->user_ptr & ~PAGE_MASK)
 386                 return -EINVAL;
 387
 388         if (!access_ok((void __user *)(unsigned long)args->user_ptr,
 389                        args->user_size))
 390                 return -EFAULT;
 391
 392         return etnaviv_gem_new_userptr(dev, file, args->user_ptr,
 393                                        args->user_size, args->flags,
 394                                        &args->handle);
 395 }
 396
 397 static int etnaviv_ioctl_gem_wait(struct drm_device *dev, void *data,
 398         struct drm_file *file)
 399 {
 400         struct etnaviv_drm_private *priv = dev->dev_private;
 401         struct drm_etnaviv_gem_wait *args = data;
 402         struct drm_etnaviv_timespec *timeout = &args->timeout;
 403         struct drm_gem_object *obj;
 404         struct etnaviv_gpu *gpu;
 405         int ret;
 406
 407         if (args->flags & ~(ETNA_WAIT_NONBLOCK))
 408                 return -EINVAL;
 409
 410         if (args->pipe >= ETNA_MAX_PIPES)
 411                 return -EINVAL;
 412
 413         gpu = priv->gpu[args->pipe];
 414         if (!gpu)
 415                 return -ENXIO;
 416
 417         obj = drm_gem_object_lookup(file, args->handle);
 418         if (!obj)
 419                 return -ENOENT;
 420
 421         if (args->flags & ETNA_WAIT_NONBLOCK)
 422                 timeout = NULL;
 423
 424         ret = etnaviv_gem_wait_bo(gpu, obj, timeout);
 425
 426         drm_gem_object_put_unlocked(obj);
 427
 428         return ret;
 429 }
 430
 431 static int etnaviv_ioctl_pm_query_dom(struct drm_device *dev, void *data,
 432         struct drm_file *file)
 433 {
 434         struct etnaviv_drm_private *priv = dev->dev_private;
 435         struct drm_etnaviv_pm_domain *args = data;
 436         struct etnaviv_gpu *gpu;
 437
 438         if (args->pipe >= ETNA_MAX_PIPES)
 439                 return -EINVAL;
 440
 441         gpu = priv->gpu[args->pipe];
 442         if (!gpu)
 443                 return -ENXIO;
 444
 445         return etnaviv_pm_query_dom(gpu, args);
 446 }
 447
 448 static int etnaviv_ioctl_pm_query_sig(struct drm_device *dev, void *data,
 449         struct drm_file *file)
 450 {
 451         struct etnaviv_drm_private *priv = dev->dev_private;
 452         struct drm_etnaviv_pm_signal *args = data;
 453         struct etnaviv_gpu *gpu;
 454
 455         if (args->pipe >= ETNA_MAX_PIPES)
 456                 return -EINVAL;
 457
 458         gpu = priv->gpu[args->pipe];
 459         if (!gpu)
 460                 return -ENXIO;
 461
 462         return etnaviv_pm_query_sig(gpu, args);
 463 }
 464
 465 static const struct drm_ioctl_desc etnaviv_ioctls[] = {
 466 #define ETNA_IOCTL(n, func, flags) \
 467         DRM_IOCTL_DEF_DRV(ETNAVIV_##n, etnaviv_ioctl_##func, flags)
 468         ETNA_IOCTL(GET_PARAM,    get_param,    DRM_RENDER_ALLOW),
 469         ETNA_IOCTL(GEM_NEW,      gem_new,      DRM_RENDER_ALLOW),
 470         ETNA_IOCTL(GEM_INFO,     gem_info,     DRM_RENDER_ALLOW),
 471         ETNA_IOCTL(GEM_CPU_PREP, gem_cpu_prep, DRM_RENDER_ALLOW),
 472         ETNA_IOCTL(GEM_CPU_FINI, gem_cpu_fini, DRM_RENDER_ALLOW),
 473         ETNA_IOCTL(GEM_SUBMIT,   gem_submit,   DRM_RENDER_ALLOW),
 474         ETNA_IOCTL(WAIT_FENCE,   wait_fence,   DRM_RENDER_ALLOW),
 475         ETNA_IOCTL(GEM_USERPTR,  gem_userptr,  DRM_RENDER_ALLOW),
 476         ETNA_IOCTL(GEM_WAIT,     gem_wait,     DRM_RENDER_ALLOW),
 477         ETNA_IOCTL(PM_QUERY_DOM, pm_query_dom, DRM_RENDER_ALLOW),
 478         ETNA_IOCTL(PM_QUERY_SIG, pm_query_sig, DRM_RENDER_ALLOW),
 479 };
 480
 481 static const struct vm_operations_struct vm_ops = {
 482         .fault = etnaviv_gem_fault,
 483         .open = drm_gem_vm_open,
 484         .close = drm_gem_vm_close,
 485 };
 486
 487 static const struct file_operations fops = {
 488         .owner              = THIS_MODULE,
 489         .open               = drm_open,
 490         .release            = drm_release,
 491         .unlocked_ioctl     = drm_ioctl,
 492         .compat_ioctl       = drm_compat_ioctl,
 493         .poll               = drm_poll,
 494         .read               = drm_read,
 495         .llseek             = no_llseek,
 496         .mmap               = etnaviv_gem_mmap,
 497 };
 498
 499 static struct drm_driver etnaviv_drm_driver = {
 500         .driver_features    = DRIVER_GEM | DRIVER_RENDER,
 501         .open               = etnaviv_open,
 502         .postclose           = etnaviv_postclose,
 503         .gem_free_object_unlocked = etnaviv_gem_free_object,
 504         .gem_vm_ops         = &vm_ops,
 505         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 506         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 507         .gem_prime_pin      = etnaviv_gem_prime_pin,
 508         .gem_prime_unpin    = etnaviv_gem_prime_unpin,
 509         .gem_prime_get_sg_table = etnaviv_gem_prime_get_sg_table,
 510         .gem_prime_import_sg_table = etnaviv_gem_prime_import_sg_table,
 511         .gem_prime_vmap     = etnaviv_gem_prime_vmap,
 512         .gem_prime_vunmap   = etnaviv_gem_prime_vunmap,
 513         .gem_prime_mmap     = etnaviv_gem_prime_mmap,
 514 #ifdef CONFIG_DEBUG_FS
 515         .debugfs_init       = etnaviv_debugfs_init,
 516 #endif
 517         .ioctls             = etnaviv_ioctls,
 518         .num_ioctls         = DRM_ETNAVIV_NUM_IOCTLS,
 519         .fops               = &fops,
 520         .name               = "etnaviv",
 521         .desc               = "etnaviv DRM",
 522         .date               = "20151214",
 523         .major              = 1,
 524         .minor              = 3,
 525 };
 526
 527 /*
 528  * Platform driver:
 529  */
 530 static int etnaviv_bind(struct device *dev)
 531 {
 532         struct etnaviv_drm_private *priv;
 533         struct drm_device *drm;
 534         int ret;
 535
 536         drm = drm_dev_alloc(&etnaviv_drm_driver, dev);
 537         if (IS_ERR(drm))
 538                 return PTR_ERR(drm);
 539
 540         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 541         if (!priv) {
 542                 dev_err(dev, "failed to allocate private data\n");
 543                 ret = -ENOMEM;
 544                 goto out_put;
 545         }
 546         drm->dev_private = priv;
 547
 548         dev->dma_parms = &priv->dma_parms;
 549         dma_set_max_seg_size(dev, SZ_2G);
 550
 551         mutex_init(&priv->gem_lock);
 552         INIT_LIST_HEAD(&priv->gem_list);
 553         priv->num_gpus = 0;
 554
 555         priv->cmdbuf_suballoc = etnaviv_cmdbuf_suballoc_new(drm->dev);
 556         if (IS_ERR(priv->cmdbuf_suballoc)) {
 557                 dev_err(drm->dev, "Failed to create cmdbuf suballocator\n");
 558                 ret = PTR_ERR(priv->cmdbuf_suballoc);
 559                 goto out_free_priv;
 560         }
 561
 562         dev_set_drvdata(dev, drm);
 563
 564         ret = component_bind_all(dev, drm);
 565         if (ret < 0)
 566                 goto out_destroy_suballoc;
 567
 568         load_gpu(drm);
 569
 570         ret = drm_dev_register(drm, 0);
 571         if (ret)
 572                 goto out_unbind;
 573
 574         return 0;
 575
 576 out_unbind:
 577         component_unbind_all(dev, drm);
 578 out_destroy_suballoc:
 579         etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
 580 out_free_priv:
 581         kfree(priv);
 582 out_put:
 583         drm_dev_put(drm);
 584
 585         return ret;
 586 }
 587
 588 static void etnaviv_unbind(struct device *dev)
 589 {
 590         struct drm_device *drm = dev_get_drvdata(dev);
 591         struct etnaviv_drm_private *priv = drm->dev_private;
 592
 593         drm_dev_unregister(drm);
 594
 595         component_unbind_all(dev, drm);
 596
 597         dev->dma_parms = NULL;
 598
 599         etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
 600
 601         drm->dev_private = NULL;
 602         kfree(priv);
 603
 604         drm_dev_put(drm);
 605 }
 606
 607 static const struct component_master_ops etnaviv_master_ops = {
 608         .bind = etnaviv_bind,
 609         .unbind = etnaviv_unbind,
 610 };
 611
 612 static int compare_of(struct device *dev, void *data)
 613 {
 614         struct device_node *np = data;
 615
 616         return dev->of_node == np;
 617 }
 618
 619 static int compare_str(struct device *dev, void *data)
 620 {
 621         return !strcmp(dev_name(dev), data);
 622 }
 623
 624 static int etnaviv_pdev_probe(struct platform_device *pdev)
 625 {
 626         struct device *dev = &pdev->dev;
 627         struct component_match *match = NULL;
 628
 629         if (!dev->platform_data) {
 630                 struct device_node *core_node;
 631
 632                 for_each_compatible_node(core_node, NULL, "vivante,gc") {
 633                         if (!of_device_is_available(core_node))
 634                                 continue;
 635
 636                         drm_of_component_match_add(&pdev->dev, &match,
 637                                                    compare_of, core_node);
 638                 }
 639         } else {
 640                 char **names = dev->platform_data;
 641                 unsigned i;
 642
 643                 for (i = 0; names[i]; i++)
 644                         component_match_add(dev, &match, compare_str, names[i]);
 645         }
 646
 647         return component_master_add_with_match(dev, &etnaviv_master_ops, match);
 648 }
 649
 650 static int etnaviv_pdev_remove(struct platform_device *pdev)
 651 {
 652         component_master_del(&pdev->dev, &etnaviv_master_ops);
 653
 654         return 0;
 655 }
 656
 657 static struct platform_driver etnaviv_platform_driver = {
 658         .probe      = etnaviv_pdev_probe,
 659         .remove     = etnaviv_pdev_remove,
 660         .driver     = {
 661                 .name   = "etnaviv",
 662         },
 663 };
 664
 665 static struct platform_device *etnaviv_drm;
 666
 667 static int __init etnaviv_init(void)
 668 {
 669         struct platform_device *pdev;
 670         int ret;
 671         struct device_node *np;
 672
 673         etnaviv_validate_init();
 674
 675         ret = platform_driver_register(&etnaviv_gpu_driver);
 676         if (ret != 0)
 677                 return ret;
 678
 679         ret = platform_driver_register(&etnaviv_platform_driver);
 680         if (ret != 0)
 681                 goto unregister_gpu_driver;
 682
 683         /*
 684          * If the DT contains at least one available GPU device, instantiate
 685          * the DRM platform device.
 686          */
 687         for_each_compatible_node(np, NULL, "vivante,gc") {
 688                 if (!of_device_is_available(np))
 689                         continue;
 690
 691                 pdev = platform_device_alloc("etnaviv", -1);
 692                 if (!pdev) {
 693                         ret = -ENOMEM;
 694                         of_node_put(np);
 695                         goto unregister_platform_driver;
 696                 }
 697                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(40);
 698                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 699
 700                 /*
 701                  * Apply the same DMA configuration to the virtual etnaviv
 702                  * device as the GPU we found. This assumes that all Vivante
 703                  * GPUs in the system share the same DMA constraints.
 704                  */
 705                 of_dma_configure(&pdev->dev, np, true);
 706
 707                 ret = platform_device_add(pdev);
 708                 if (ret) {
 709                         platform_device_put(pdev);
 710                         of_node_put(np);
 711                         goto unregister_platform_driver;
 712                 }
 713
 714                 etnaviv_drm = pdev;
 715                 of_node_put(np);
 716                 break;
 717         }
 718
 719         return 0;
 720
 721 unregister_platform_driver:
 722         platform_driver_unregister(&etnaviv_platform_driver);
 723 unregister_gpu_driver:
 724         platform_driver_unregister(&etnaviv_gpu_driver);
 725         return ret;
 726 }
 727 module_init(etnaviv_init);
 728
 729 static void __exit etnaviv_exit(void)
 730 {
 731         platform_device_unregister(etnaviv_drm);
 732         platform_driver_unregister(&etnaviv_platform_driver);
 733         platform_driver_unregister(&etnaviv_gpu_driver);
 734 }
 735 module_exit(etnaviv_exit);
 736
 737 MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>");
 738 MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
 739 MODULE_AUTHOR("Lucas Stach <l.stach@pengutronix.de>");
 740 MODULE_DESCRIPTION("etnaviv DRM Driver");
 741 MODULE_LICENSE("GPL v2");
 742 MODULE_ALIAS("platform:etnaviv");