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_sched_rq *rq;
  69
  70                 if (gpu) {
  71                         rq = &gpu->sched.sched_rq[DRM_SCHED_PRIORITY_NORMAL];
  72                         drm_sched_entity_init(&ctx->sched_entity[i],
  73                                               &rq, 1, NULL);
  74                         }
  75         }
  76
  77         file->driver_priv = ctx;
  78
  79         return 0;
  80
  81 out_free:
  82         kfree(ctx);
  83         return ret;
  84 }
  85
  86 static void etnaviv_postclose(struct drm_device *dev, struct drm_file *file)
  87 {
  88         struct etnaviv_drm_private *priv = dev->dev_private;
  89         struct etnaviv_file_private *ctx = file->driver_priv;
  90         unsigned int i;
  91
  92         for (i = 0; i < ETNA_MAX_PIPES; i++) {
  93                 struct etnaviv_gpu *gpu = priv->gpu[i];
  94
  95                 if (gpu)
  96                         drm_sched_entity_destroy(&ctx->sched_entity[i]);
  97         }
  98
  99         etnaviv_iommu_context_put(ctx->mmu);
 100
 101         kfree(ctx);
 102 }
 103
 104 /*
 105  * DRM debugfs:
 106  */
 107
 108 #ifdef CONFIG_DEBUG_FS
 109 static int etnaviv_gem_show(struct drm_device *dev, struct seq_file *m)
 110 {
 111         struct etnaviv_drm_private *priv = dev->dev_private;
 112
 113         etnaviv_gem_describe_objects(priv, m);
 114
 115         return 0;
 116 }
 117
 118 static int etnaviv_mm_show(struct drm_device *dev, struct seq_file *m)
 119 {
 120         struct drm_printer p = drm_seq_file_printer(m);
 121
 122         read_lock(&dev->vma_offset_manager->vm_lock);
 123         drm_mm_print(&dev->vma_offset_manager->vm_addr_space_mm, &p);
 124         read_unlock(&dev->vma_offset_manager->vm_lock);
 125
 126         return 0;
 127 }
 128
 129 static int etnaviv_mmu_show(struct etnaviv_gpu *gpu, struct seq_file *m)
 130 {
 131         struct drm_printer p = drm_seq_file_printer(m);
 132         struct etnaviv_iommu_context *mmu_context;
 133
 134         seq_printf(m, "Active Objects (%s):\n", dev_name(gpu->dev));
 135
 136         /*
 137          * Lock the GPU to avoid a MMU context switch just now and elevate
 138          * the refcount of the current context to avoid it disappearing from
 139          * under our feet.
 140          */
 141         mutex_lock(&gpu->lock);
 142         mmu_context = gpu->mmu_context;
 143         if (mmu_context)
 144                 etnaviv_iommu_context_get(mmu_context);
 145         mutex_unlock(&gpu->lock);
 146
 147         if (!mmu_context)
 148                 return 0;
 149
 150         mutex_lock(&mmu_context->lock);
 151         drm_mm_print(&mmu_context->mm, &p);
 152         mutex_unlock(&mmu_context->lock);
 153
 154         etnaviv_iommu_context_put(mmu_context);
 155
 156         return 0;
 157 }
 158
 159 static void etnaviv_buffer_dump(struct etnaviv_gpu *gpu, struct seq_file *m)
 160 {
 161         struct etnaviv_cmdbuf *buf = &gpu->buffer;
 162         u32 size = buf->size;
 163         u32 *ptr = buf->vaddr;
 164         u32 i;
 165
 166         seq_printf(m, "virt %p - phys 0x%llx - free 0x%08x\n",
 167                         buf->vaddr, (u64)etnaviv_cmdbuf_get_pa(buf),
 168                         size - buf->user_size);
 169
 170         for (i = 0; i < size / 4; i++) {
 171                 if (i && !(i % 4))
 172                         seq_puts(m, "\n");
 173                 if (i % 4 == 0)
 174                         seq_printf(m, "\t0x%p: ", ptr + i);
 175                 seq_printf(m, "%08x ", *(ptr + i));
 176         }
 177         seq_puts(m, "\n");
 178 }
 179
 180 static int etnaviv_ring_show(struct etnaviv_gpu *gpu, struct seq_file *m)
 181 {
 182         seq_printf(m, "Ring Buffer (%s): ", dev_name(gpu->dev));
 183
 184         mutex_lock(&gpu->lock);
 185         etnaviv_buffer_dump(gpu, m);
 186         mutex_unlock(&gpu->lock);
 187
 188         return 0;
 189 }
 190
 191 static int show_unlocked(struct seq_file *m, void *arg)
 192 {
 193         struct drm_info_node *node = (struct drm_info_node *) m->private;
 194         struct drm_device *dev = node->minor->dev;
 195         int (*show)(struct drm_device *dev, struct seq_file *m) =
 196                         node->info_ent->data;
 197
 198         return show(dev, m);
 199 }
 200
 201 static int show_each_gpu(struct seq_file *m, void *arg)
 202 {
 203         struct drm_info_node *node = (struct drm_info_node *) m->private;
 204         struct drm_device *dev = node->minor->dev;
 205         struct etnaviv_drm_private *priv = dev->dev_private;
 206         struct etnaviv_gpu *gpu;
 207         int (*show)(struct etnaviv_gpu *gpu, struct seq_file *m) =
 208                         node->info_ent->data;
 209         unsigned int i;
 210         int ret = 0;
 211
 212         for (i = 0; i < ETNA_MAX_PIPES; i++) {
 213                 gpu = priv->gpu[i];
 214                 if (!gpu)
 215                         continue;
 216
 217                 ret = show(gpu, m);
 218                 if (ret < 0)
 219                         break;
 220         }
 221
 222         return ret;
 223 }
 224
 225 static struct drm_info_list etnaviv_debugfs_list[] = {
 226                 {"gpu", show_each_gpu, 0, etnaviv_gpu_debugfs},
 227                 {"gem", show_unlocked, 0, etnaviv_gem_show},
 228                 { "mm", show_unlocked, 0, etnaviv_mm_show },
 229                 {"mmu", show_each_gpu, 0, etnaviv_mmu_show},
 230                 {"ring", show_each_gpu, 0, etnaviv_ring_show},
 231 };
 232
 233 static int etnaviv_debugfs_init(struct drm_minor *minor)
 234 {
 235         struct drm_device *dev = minor->dev;
 236         int ret;
 237
 238         ret = drm_debugfs_create_files(etnaviv_debugfs_list,
 239                         ARRAY_SIZE(etnaviv_debugfs_list),
 240                         minor->debugfs_root, minor);
 241
 242         if (ret) {
 243                 dev_err(dev->dev, "could not install etnaviv_debugfs_list\n");
 244                 return ret;
 245         }
 246
 247         return ret;
 248 }
 249 #endif
 250
 251 /*
 252  * DRM ioctls:
 253  */
 254
 255 static int etnaviv_ioctl_get_param(struct drm_device *dev, void *data,
 256                 struct drm_file *file)
 257 {
 258         struct etnaviv_drm_private *priv = dev->dev_private;
 259         struct drm_etnaviv_param *args = data;
 260         struct etnaviv_gpu *gpu;
 261
 262         if (args->pipe >= ETNA_MAX_PIPES)
 263                 return -EINVAL;
 264
 265         gpu = priv->gpu[args->pipe];
 266         if (!gpu)
 267                 return -ENXIO;
 268
 269         return etnaviv_gpu_get_param(gpu, args->param, &args->value);
 270 }
 271
 272 static int etnaviv_ioctl_gem_new(struct drm_device *dev, void *data,
 273                 struct drm_file *file)
 274 {
 275         struct drm_etnaviv_gem_new *args = data;
 276
 277         if (args->flags & ~(ETNA_BO_CACHED | ETNA_BO_WC | ETNA_BO_UNCACHED |
 278                             ETNA_BO_FORCE_MMU))
 279                 return -EINVAL;
 280
 281         return etnaviv_gem_new_handle(dev, file, args->size,
 282                         args->flags, &args->handle);
 283 }
 284
 285 #define TS(t) ((struct timespec){ \
 286         .tv_sec = (t).tv_sec, \
 287         .tv_nsec = (t).tv_nsec \
 288 })
 289
 290 static int etnaviv_ioctl_gem_cpu_prep(struct drm_device *dev, void *data,
 291                 struct drm_file *file)
 292 {
 293         struct drm_etnaviv_gem_cpu_prep *args = data;
 294         struct drm_gem_object *obj;
 295         int ret;
 296
 297         if (args->op & ~(ETNA_PREP_READ | ETNA_PREP_WRITE | ETNA_PREP_NOSYNC))
 298                 return -EINVAL;
 299
 300         obj = drm_gem_object_lookup(file, args->handle);
 301         if (!obj)
 302                 return -ENOENT;
 303
 304         ret = etnaviv_gem_cpu_prep(obj, args->op, &TS(args->timeout));
 305
 306         drm_gem_object_put_unlocked(obj);
 307
 308         return ret;
 309 }
 310
 311 static int etnaviv_ioctl_gem_cpu_fini(struct drm_device *dev, void *data,
 312                 struct drm_file *file)
 313 {
 314         struct drm_etnaviv_gem_cpu_fini *args = data;
 315         struct drm_gem_object *obj;
 316         int ret;
 317
 318         if (args->flags)
 319                 return -EINVAL;
 320
 321         obj = drm_gem_object_lookup(file, args->handle);
 322         if (!obj)
 323                 return -ENOENT;
 324
 325         ret = etnaviv_gem_cpu_fini(obj);
 326
 327         drm_gem_object_put_unlocked(obj);
 328
 329         return ret;
 330 }
 331
 332 static int etnaviv_ioctl_gem_info(struct drm_device *dev, void *data,
 333                 struct drm_file *file)
 334 {
 335         struct drm_etnaviv_gem_info *args = data;
 336         struct drm_gem_object *obj;
 337         int ret;
 338
 339         if (args->pad)
 340                 return -EINVAL;
 341
 342         obj = drm_gem_object_lookup(file, args->handle);
 343         if (!obj)
 344                 return -ENOENT;
 345
 346         ret = etnaviv_gem_mmap_offset(obj, &args->offset);
 347         drm_gem_object_put_unlocked(obj);
 348
 349         return ret;
 350 }
 351
 352 static int etnaviv_ioctl_wait_fence(struct drm_device *dev, void *data,
 353                 struct drm_file *file)
 354 {
 355         struct drm_etnaviv_wait_fence *args = data;
 356         struct etnaviv_drm_private *priv = dev->dev_private;
 357         struct timespec *timeout = &TS(args->timeout);
 358         struct etnaviv_gpu *gpu;
 359
 360         if (args->flags & ~(ETNA_WAIT_NONBLOCK))
 361                 return -EINVAL;
 362
 363         if (args->pipe >= ETNA_MAX_PIPES)
 364                 return -EINVAL;
 365
 366         gpu = priv->gpu[args->pipe];
 367         if (!gpu)
 368                 return -ENXIO;
 369
 370         if (args->flags & ETNA_WAIT_NONBLOCK)
 371                 timeout = NULL;
 372
 373         return etnaviv_gpu_wait_fence_interruptible(gpu, args->fence,
 374                                                     timeout);
 375 }
 376
 377 static int etnaviv_ioctl_gem_userptr(struct drm_device *dev, void *data,
 378         struct drm_file *file)
 379 {
 380         struct drm_etnaviv_gem_userptr *args = data;
 381
 382         if (args->flags & ~(ETNA_USERPTR_READ|ETNA_USERPTR_WRITE) ||
 383             args->flags == 0)
 384                 return -EINVAL;
 385
 386         if (offset_in_page(args->user_ptr | args->user_size) ||
 387             (uintptr_t)args->user_ptr != args->user_ptr ||
 388             (u32)args->user_size != args->user_size ||
 389             args->user_ptr & ~PAGE_MASK)
 390                 return -EINVAL;
 391
 392         if (!access_ok((void __user *)(unsigned long)args->user_ptr,
 393                        args->user_size))
 394                 return -EFAULT;
 395
 396         return etnaviv_gem_new_userptr(dev, file, args->user_ptr,
 397                                        args->user_size, args->flags,
 398                                        &args->handle);
 399 }
 400
 401 static int etnaviv_ioctl_gem_wait(struct drm_device *dev, void *data,
 402         struct drm_file *file)
 403 {
 404         struct etnaviv_drm_private *priv = dev->dev_private;
 405         struct drm_etnaviv_gem_wait *args = data;
 406         struct timespec *timeout = &TS(args->timeout);
 407         struct drm_gem_object *obj;
 408         struct etnaviv_gpu *gpu;
 409         int ret;
 410
 411         if (args->flags & ~(ETNA_WAIT_NONBLOCK))
 412                 return -EINVAL;
 413
 414         if (args->pipe >= ETNA_MAX_PIPES)
 415                 return -EINVAL;
 416
 417         gpu = priv->gpu[args->pipe];
 418         if (!gpu)
 419                 return -ENXIO;
 420
 421         obj = drm_gem_object_lookup(file, args->handle);
 422         if (!obj)
 423                 return -ENOENT;
 424
 425         if (args->flags & ETNA_WAIT_NONBLOCK)
 426                 timeout = NULL;
 427
 428         ret = etnaviv_gem_wait_bo(gpu, obj, timeout);
 429
 430         drm_gem_object_put_unlocked(obj);
 431
 432         return ret;
 433 }
 434
 435 static int etnaviv_ioctl_pm_query_dom(struct drm_device *dev, void *data,
 436         struct drm_file *file)
 437 {
 438         struct etnaviv_drm_private *priv = dev->dev_private;
 439         struct drm_etnaviv_pm_domain *args = data;
 440         struct etnaviv_gpu *gpu;
 441
 442         if (args->pipe >= ETNA_MAX_PIPES)
 443                 return -EINVAL;
 444
 445         gpu = priv->gpu[args->pipe];
 446         if (!gpu)
 447                 return -ENXIO;
 448
 449         return etnaviv_pm_query_dom(gpu, args);
 450 }
 451
 452 static int etnaviv_ioctl_pm_query_sig(struct drm_device *dev, void *data,
 453         struct drm_file *file)
 454 {
 455         struct etnaviv_drm_private *priv = dev->dev_private;
 456         struct drm_etnaviv_pm_signal *args = data;
 457         struct etnaviv_gpu *gpu;
 458
 459         if (args->pipe >= ETNA_MAX_PIPES)
 460                 return -EINVAL;
 461
 462         gpu = priv->gpu[args->pipe];
 463         if (!gpu)
 464                 return -ENXIO;
 465
 466         return etnaviv_pm_query_sig(gpu, args);
 467 }
 468
 469 static const struct drm_ioctl_desc etnaviv_ioctls[] = {
 470 #define ETNA_IOCTL(n, func, flags) \
 471         DRM_IOCTL_DEF_DRV(ETNAVIV_##n, etnaviv_ioctl_##func, flags)
 472         ETNA_IOCTL(GET_PARAM,    get_param,    DRM_AUTH|DRM_RENDER_ALLOW),
 473         ETNA_IOCTL(GEM_NEW,      gem_new,      DRM_AUTH|DRM_RENDER_ALLOW),
 474         ETNA_IOCTL(GEM_INFO,     gem_info,     DRM_AUTH|DRM_RENDER_ALLOW),
 475         ETNA_IOCTL(GEM_CPU_PREP, gem_cpu_prep, DRM_AUTH|DRM_RENDER_ALLOW),
 476         ETNA_IOCTL(GEM_CPU_FINI, gem_cpu_fini, DRM_AUTH|DRM_RENDER_ALLOW),
 477         ETNA_IOCTL(GEM_SUBMIT,   gem_submit,   DRM_AUTH|DRM_RENDER_ALLOW),
 478         ETNA_IOCTL(WAIT_FENCE,   wait_fence,   DRM_AUTH|DRM_RENDER_ALLOW),
 479         ETNA_IOCTL(GEM_USERPTR,  gem_userptr,  DRM_AUTH|DRM_RENDER_ALLOW),
 480         ETNA_IOCTL(GEM_WAIT,     gem_wait,     DRM_AUTH|DRM_RENDER_ALLOW),
 481         ETNA_IOCTL(PM_QUERY_DOM, pm_query_dom, DRM_AUTH|DRM_RENDER_ALLOW),
 482         ETNA_IOCTL(PM_QUERY_SIG, pm_query_sig, DRM_AUTH|DRM_RENDER_ALLOW),
 483 };
 484
 485 static const struct vm_operations_struct vm_ops = {
 486         .fault = etnaviv_gem_fault,
 487         .open = drm_gem_vm_open,
 488         .close = drm_gem_vm_close,
 489 };
 490
 491 static const struct file_operations fops = {
 492         .owner              = THIS_MODULE,
 493         .open               = drm_open,
 494         .release            = drm_release,
 495         .unlocked_ioctl     = drm_ioctl,
 496         .compat_ioctl       = drm_compat_ioctl,
 497         .poll               = drm_poll,
 498         .read               = drm_read,
 499         .llseek             = no_llseek,
 500         .mmap               = etnaviv_gem_mmap,
 501 };
 502
 503 static struct drm_driver etnaviv_drm_driver = {
 504         .driver_features    = DRIVER_GEM |
 505                                 DRIVER_PRIME |
 506                                 DRIVER_RENDER,
 507         .open               = etnaviv_open,
 508         .postclose           = etnaviv_postclose,
 509         .gem_free_object_unlocked = etnaviv_gem_free_object,
 510         .gem_vm_ops         = &vm_ops,
 511         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 512         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 513         .gem_prime_export   = drm_gem_prime_export,
 514         .gem_prime_import   = drm_gem_prime_import,
 515         .gem_prime_pin      = etnaviv_gem_prime_pin,
 516         .gem_prime_unpin    = etnaviv_gem_prime_unpin,
 517         .gem_prime_get_sg_table = etnaviv_gem_prime_get_sg_table,
 518         .gem_prime_import_sg_table = etnaviv_gem_prime_import_sg_table,
 519         .gem_prime_vmap     = etnaviv_gem_prime_vmap,
 520         .gem_prime_vunmap   = etnaviv_gem_prime_vunmap,
 521         .gem_prime_mmap     = etnaviv_gem_prime_mmap,
 522 #ifdef CONFIG_DEBUG_FS
 523         .debugfs_init       = etnaviv_debugfs_init,
 524 #endif
 525         .ioctls             = etnaviv_ioctls,
 526         .num_ioctls         = DRM_ETNAVIV_NUM_IOCTLS,
 527         .fops               = &fops,
 528         .name               = "etnaviv",
 529         .desc               = "etnaviv DRM",
 530         .date               = "20151214",
 531         .major              = 1,
 532         .minor              = 2,
 533 };
 534
 535 /*
 536  * Platform driver:
 537  */
 538 static int etnaviv_bind(struct device *dev)
 539 {
 540         struct etnaviv_drm_private *priv;
 541         struct drm_device *drm;
 542         int ret;
 543
 544         drm = drm_dev_alloc(&etnaviv_drm_driver, dev);
 545         if (IS_ERR(drm))
 546                 return PTR_ERR(drm);
 547
 548         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 549         if (!priv) {
 550                 dev_err(dev, "failed to allocate private data\n");
 551                 ret = -ENOMEM;
 552                 goto out_put;
 553         }
 554         drm->dev_private = priv;
 555
 556         dev->dma_parms = &priv->dma_parms;
 557         dma_set_max_seg_size(dev, SZ_2G);
 558
 559         mutex_init(&priv->gem_lock);
 560         INIT_LIST_HEAD(&priv->gem_list);
 561         priv->num_gpus = 0;
 562
 563         priv->cmdbuf_suballoc = etnaviv_cmdbuf_suballoc_new(drm->dev);
 564         if (IS_ERR(priv->cmdbuf_suballoc)) {
 565                 dev_err(drm->dev, "Failed to create cmdbuf suballocator\n");
 566                 ret = PTR_ERR(priv->cmdbuf_suballoc);
 567                 goto out_free_priv;
 568         }
 569
 570         dev_set_drvdata(dev, drm);
 571
 572         ret = component_bind_all(dev, drm);
 573         if (ret < 0)
 574                 goto out_destroy_suballoc;
 575
 576         load_gpu(drm);
 577
 578         ret = drm_dev_register(drm, 0);
 579         if (ret)
 580                 goto out_unbind;
 581
 582         return 0;
 583
 584 out_unbind:
 585         component_unbind_all(dev, drm);
 586 out_destroy_suballoc:
 587         etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
 588 out_free_priv:
 589         kfree(priv);
 590 out_put:
 591         drm_dev_put(drm);
 592
 593         return ret;
 594 }
 595
 596 static void etnaviv_unbind(struct device *dev)
 597 {
 598         struct drm_device *drm = dev_get_drvdata(dev);
 599         struct etnaviv_drm_private *priv = drm->dev_private;
 600
 601         drm_dev_unregister(drm);
 602
 603         component_unbind_all(dev, drm);
 604
 605         dev->dma_parms = NULL;
 606
 607         etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
 608
 609         drm->dev_private = NULL;
 610         kfree(priv);
 611
 612         drm_dev_put(drm);
 613 }
 614
 615 static const struct component_master_ops etnaviv_master_ops = {
 616         .bind = etnaviv_bind,
 617         .unbind = etnaviv_unbind,
 618 };
 619
 620 static int compare_of(struct device *dev, void *data)
 621 {
 622         struct device_node *np = data;
 623
 624         return dev->of_node == np;
 625 }
 626
 627 static int compare_str(struct device *dev, void *data)
 628 {
 629         return !strcmp(dev_name(dev), data);
 630 }
 631
 632 static int etnaviv_pdev_probe(struct platform_device *pdev)
 633 {
 634         struct device *dev = &pdev->dev;
 635         struct component_match *match = NULL;
 636
 637         if (!dev->platform_data) {
 638                 struct device_node *core_node;
 639
 640                 for_each_compatible_node(core_node, NULL, "vivante,gc") {
 641                         if (!of_device_is_available(core_node))
 642                                 continue;
 643
 644                         drm_of_component_match_add(&pdev->dev, &match,
 645                                                    compare_of, core_node);
 646                 }
 647         } else {
 648                 char **names = dev->platform_data;
 649                 unsigned i;
 650
 651                 for (i = 0; names[i]; i++)
 652                         component_match_add(dev, &match, compare_str, names[i]);
 653         }
 654
 655         return component_master_add_with_match(dev, &etnaviv_master_ops, match);
 656 }
 657
 658 static int etnaviv_pdev_remove(struct platform_device *pdev)
 659 {
 660         component_master_del(&pdev->dev, &etnaviv_master_ops);
 661
 662         return 0;
 663 }
 664
 665 static struct platform_driver etnaviv_platform_driver = {
 666         .probe      = etnaviv_pdev_probe,
 667         .remove     = etnaviv_pdev_remove,
 668         .driver     = {
 669                 .name   = "etnaviv",
 670         },
 671 };
 672
 673 static struct platform_device *etnaviv_drm;
 674
 675 static int __init etnaviv_init(void)
 676 {
 677         struct platform_device *pdev;
 678         int ret;
 679         struct device_node *np;
 680
 681         etnaviv_validate_init();
 682
 683         ret = platform_driver_register(&etnaviv_gpu_driver);
 684         if (ret != 0)
 685                 return ret;
 686
 687         ret = platform_driver_register(&etnaviv_platform_driver);
 688         if (ret != 0)
 689                 goto unregister_gpu_driver;
 690
 691         /*
 692          * If the DT contains at least one available GPU device, instantiate
 693          * the DRM platform device.
 694          */
 695         for_each_compatible_node(np, NULL, "vivante,gc") {
 696                 if (!of_device_is_available(np))
 697                         continue;
 698
 699                 pdev = platform_device_alloc("etnaviv", -1);
 700                 if (!pdev) {
 701                         ret = -ENOMEM;
 702                         of_node_put(np);
 703                         goto unregister_platform_driver;
 704                 }
 705                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(40);
 706                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 707
 708                 /*
 709                  * Apply the same DMA configuration to the virtual etnaviv
 710                  * device as the GPU we found. This assumes that all Vivante
 711                  * GPUs in the system share the same DMA constraints.
 712                  */
 713                 of_dma_configure(&pdev->dev, np, true);
 714
 715                 ret = platform_device_add(pdev);
 716                 if (ret) {
 717                         platform_device_put(pdev);
 718                         of_node_put(np);
 719                         goto unregister_platform_driver;
 720                 }
 721
 722                 etnaviv_drm = pdev;
 723                 of_node_put(np);
 724                 break;
 725         }
 726
 727         return 0;
 728
 729 unregister_platform_driver:
 730         platform_driver_unregister(&etnaviv_platform_driver);
 731 unregister_gpu_driver:
 732         platform_driver_unregister(&etnaviv_gpu_driver);
 733         return ret;
 734 }
 735 module_init(etnaviv_init);
 736
 737 static void __exit etnaviv_exit(void)
 738 {
 739         platform_device_unregister(etnaviv_drm);
 740         platform_driver_unregister(&etnaviv_platform_driver);
 741         platform_driver_unregister(&etnaviv_gpu_driver);
 742 }
 743 module_exit(etnaviv_exit);
 744
 745 MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>");
 746 MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
 747 MODULE_AUTHOR("Lucas Stach <l.stach@pengutronix.de>");
 748 MODULE_DESCRIPTION("etnaviv DRM Driver");
 749 MODULE_LICENSE("GPL v2");
 750 MODULE_ALIAS("platform:etnaviv");