drivers/gpu/drm/vc4/vc4_bo.c

   1 /*
   2  *  Copyright © 2015 Broadcom
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 /**
  10  * DOC: VC4 GEM BO management support
  11  *
  12  * The VC4 GPU architecture (both scanout and rendering) has direct
  13  * access to system memory with no MMU in between.  To support it, we
  14  * use the GEM CMA helper functions to allocate contiguous ranges of
  15  * physical memory for our BOs.
  16  *
  17  * Since the CMA allocator is very slow, we keep a cache of recently
  18  * freed BOs around so that the kernel's allocation of objects for 3D
  19  * rendering can return quickly.
  20  */
  21
  22 #include <linux/dma-buf.h>
  23
  24 #include "vc4_drv.h"
  25 #include "uapi/drm/vc4_drm.h"
  26
  27 static void vc4_bo_stats_dump(struct vc4_dev *vc4)
  28 {
  29         DRM_INFO("num bos allocated: %d\n",
  30                  vc4->bo_stats.num_allocated);
  31         DRM_INFO("size bos allocated: %dkb\n",
  32                  vc4->bo_stats.size_allocated / 1024);
  33         DRM_INFO("num bos used: %d\n",
  34                  vc4->bo_stats.num_allocated - vc4->bo_stats.num_cached);
  35         DRM_INFO("size bos used: %dkb\n",
  36                  (vc4->bo_stats.size_allocated -
  37                   vc4->bo_stats.size_cached) / 1024);
  38         DRM_INFO("num bos cached: %d\n",
  39                  vc4->bo_stats.num_cached);
  40         DRM_INFO("size bos cached: %dkb\n",
  41                  vc4->bo_stats.size_cached / 1024);
  42 }
  43
  44 #ifdef CONFIG_DEBUG_FS
  45 int vc4_bo_stats_debugfs(struct seq_file *m, void *unused)
  46 {
  47         struct drm_info_node *node = (struct drm_info_node *)m->private;
  48         struct drm_device *dev = node->minor->dev;
  49         struct vc4_dev *vc4 = to_vc4_dev(dev);
  50         struct vc4_bo_stats stats;
  51
  52         /* Take a snapshot of the current stats with the lock held. */
  53         mutex_lock(&vc4->bo_lock);
  54         stats = vc4->bo_stats;
  55         mutex_unlock(&vc4->bo_lock);
  56
  57         seq_printf(m, "num bos allocated: %d\n",
  58                    stats.num_allocated);
  59         seq_printf(m, "size bos allocated: %dkb\n",
  60                    stats.size_allocated / 1024);
  61         seq_printf(m, "num bos used: %d\n",
  62                    stats.num_allocated - stats.num_cached);
  63         seq_printf(m, "size bos used: %dkb\n",
  64                    (stats.size_allocated - stats.size_cached) / 1024);
  65         seq_printf(m, "num bos cached: %d\n",
  66                    stats.num_cached);
  67         seq_printf(m, "size bos cached: %dkb\n",
  68                    stats.size_cached / 1024);
  69
  70         return 0;
  71 }
  72 #endif
  73
  74 static uint32_t bo_page_index(size_t size)
  75 {
  76         return (size / PAGE_SIZE) - 1;
  77 }
  78
  79 /* Must be called with bo_lock held. */
  80 static void vc4_bo_destroy(struct vc4_bo *bo)
  81 {
  82         struct drm_gem_object *obj = &bo->base.base;
  83         struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
  84
  85         if (bo->validated_shader) {
  86                 kfree(bo->validated_shader->texture_samples);
  87                 kfree(bo->validated_shader);
  88                 bo->validated_shader = NULL;
  89         }
  90
  91         vc4->bo_stats.num_allocated--;
  92         vc4->bo_stats.size_allocated -= obj->size;
  93
  94         reservation_object_fini(&bo->_resv);
  95
  96         drm_gem_cma_free_object(obj);
  97 }
  98
  99 /* Must be called with bo_lock held. */
 100 static void vc4_bo_remove_from_cache(struct vc4_bo *bo)
 101 {
 102         struct drm_gem_object *obj = &bo->base.base;
 103         struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
 104
 105         vc4->bo_stats.num_cached--;
 106         vc4->bo_stats.size_cached -= obj->size;
 107
 108         list_del(&bo->unref_head);
 109         list_del(&bo->size_head);
 110 }
 111
 112 static struct list_head *vc4_get_cache_list_for_size(struct drm_device *dev,
 113                                                      size_t size)
 114 {
 115         struct vc4_dev *vc4 = to_vc4_dev(dev);
 116         uint32_t page_index = bo_page_index(size);
 117
 118         if (vc4->bo_cache.size_list_size <= page_index) {
 119                 uint32_t new_size = max(vc4->bo_cache.size_list_size * 2,
 120                                         page_index + 1);
 121                 struct list_head *new_list;
 122                 uint32_t i;
 123
 124                 new_list = kmalloc_array(new_size, sizeof(struct list_head),
 125                                          GFP_KERNEL);
 126                 if (!new_list)
 127                         return NULL;
 128
 129                 /* Rebase the old cached BO lists to their new list
 130                  * head locations.
 131                  */
 132                 for (i = 0; i < vc4->bo_cache.size_list_size; i++) {
 133                         struct list_head *old_list =
 134                                 &vc4->bo_cache.size_list[i];
 135
 136                         if (list_empty(old_list))
 137                                 INIT_LIST_HEAD(&new_list[i]);
 138                         else
 139                                 list_replace(old_list, &new_list[i]);
 140                 }
 141                 /* And initialize the brand new BO list heads. */
 142                 for (i = vc4->bo_cache.size_list_size; i < new_size; i++)
 143                         INIT_LIST_HEAD(&new_list[i]);
 144
 145                 kfree(vc4->bo_cache.size_list);
 146                 vc4->bo_cache.size_list = new_list;
 147                 vc4->bo_cache.size_list_size = new_size;
 148         }
 149
 150         return &vc4->bo_cache.size_list[page_index];
 151 }
 152
 153 static void vc4_bo_cache_purge(struct drm_device *dev)
 154 {
 155         struct vc4_dev *vc4 = to_vc4_dev(dev);
 156
 157         mutex_lock(&vc4->bo_lock);
 158         while (!list_empty(&vc4->bo_cache.time_list)) {
 159                 struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
 160                                                     struct vc4_bo, unref_head);
 161                 vc4_bo_remove_from_cache(bo);
 162                 vc4_bo_destroy(bo);
 163         }
 164         mutex_unlock(&vc4->bo_lock);
 165 }
 166
 167 static struct vc4_bo *vc4_bo_get_from_cache(struct drm_device *dev,
 168                                             uint32_t size)
 169 {
 170         struct vc4_dev *vc4 = to_vc4_dev(dev);
 171         uint32_t page_index = bo_page_index(size);
 172         struct vc4_bo *bo = NULL;
 173
 174         size = roundup(size, PAGE_SIZE);
 175
 176         mutex_lock(&vc4->bo_lock);
 177         if (page_index >= vc4->bo_cache.size_list_size)
 178                 goto out;
 179
 180         if (list_empty(&vc4->bo_cache.size_list[page_index]))
 181                 goto out;
 182
 183         bo = list_first_entry(&vc4->bo_cache.size_list[page_index],
 184                               struct vc4_bo, size_head);
 185         vc4_bo_remove_from_cache(bo);
 186         kref_init(&bo->base.base.refcount);
 187
 188 out:
 189         mutex_unlock(&vc4->bo_lock);
 190         return bo;
 191 }
 192
 193 /**
 194  * vc4_gem_create_object - Implementation of driver->gem_create_object.
 195  * @dev: DRM device
 196  * @size: Size in bytes of the memory the object will reference
 197  *
 198  * This lets the CMA helpers allocate object structs for us, and keep
 199  * our BO stats correct.
 200  */
 201 struct drm_gem_object *vc4_create_object(struct drm_device *dev, size_t size)
 202 {
 203         struct vc4_dev *vc4 = to_vc4_dev(dev);
 204         struct vc4_bo *bo;
 205
 206         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
 207         if (!bo)
 208                 return ERR_PTR(-ENOMEM);
 209
 210         mutex_lock(&vc4->bo_lock);
 211         vc4->bo_stats.num_allocated++;
 212         vc4->bo_stats.size_allocated += size;
 213         mutex_unlock(&vc4->bo_lock);
 214         bo->resv = &bo->_resv;
 215         reservation_object_init(bo->resv);
 216
 217         return &bo->base.base;
 218 }
 219
 220 struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t unaligned_size,
 221                              bool allow_unzeroed)
 222 {
 223         size_t size = roundup(unaligned_size, PAGE_SIZE);
 224         struct vc4_dev *vc4 = to_vc4_dev(dev);
 225         struct drm_gem_cma_object *cma_obj;
 226         struct vc4_bo *bo;
 227
 228         if (size == 0)
 229                 return ERR_PTR(-EINVAL);
 230
 231         /* First, try to get a vc4_bo from the kernel BO cache. */
 232         bo = vc4_bo_get_from_cache(dev, size);
 233         if (bo) {
 234                 if (!allow_unzeroed)
 235                         memset(bo->base.vaddr, 0, bo->base.base.size);
 236                 return bo;
 237         }
 238
 239         cma_obj = drm_gem_cma_create(dev, size);
 240         if (IS_ERR(cma_obj)) {
 241                 /*
 242                  * If we've run out of CMA memory, kill the cache of
 243                  * CMA allocations we've got laying around and try again.
 244                  */
 245                 vc4_bo_cache_purge(dev);
 246
 247                 cma_obj = drm_gem_cma_create(dev, size);
 248                 if (IS_ERR(cma_obj)) {
 249                         DRM_ERROR("Failed to allocate from CMA:\n");
 250                         vc4_bo_stats_dump(vc4);
 251                         return ERR_PTR(-ENOMEM);
 252                 }
 253         }
 254         return to_vc4_bo(&cma_obj->base);
 255 }
 256
 257 int vc4_dumb_create(struct drm_file *file_priv,
 258                     struct drm_device *dev,
 259                     struct drm_mode_create_dumb *args)
 260 {
 261         int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 262         struct vc4_bo *bo = NULL;
 263         int ret;
 264
 265         if (args->pitch < min_pitch)
 266                 args->pitch = min_pitch;
 267
 268         if (args->size < args->pitch * args->height)
 269                 args->size = args->pitch * args->height;
 270
 271         bo = vc4_bo_create(dev, args->size, false);
 272         if (IS_ERR(bo))
 273                 return PTR_ERR(bo);
 274
 275         ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
 276         drm_gem_object_unreference_unlocked(&bo->base.base);
 277
 278         return ret;
 279 }
 280
 281 /* Must be called with bo_lock held. */
 282 static void vc4_bo_cache_free_old(struct drm_device *dev)
 283 {
 284         struct vc4_dev *vc4 = to_vc4_dev(dev);
 285         unsigned long expire_time = jiffies - msecs_to_jiffies(1000);
 286
 287         while (!list_empty(&vc4->bo_cache.time_list)) {
 288                 struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
 289                                                     struct vc4_bo, unref_head);
 290                 if (time_before(expire_time, bo->free_time)) {
 291                         mod_timer(&vc4->bo_cache.time_timer,
 292                                   round_jiffies_up(jiffies +
 293                                                    msecs_to_jiffies(1000)));
 294                         return;
 295                 }
 296
 297                 vc4_bo_remove_from_cache(bo);
 298                 vc4_bo_destroy(bo);
 299         }
 300 }
 301
 302 /* Called on the last userspace/kernel unreference of the BO.  Returns
 303  * it to the BO cache if possible, otherwise frees it.
 304  */
 305 void vc4_free_object(struct drm_gem_object *gem_bo)
 306 {
 307         struct drm_device *dev = gem_bo->dev;
 308         struct vc4_dev *vc4 = to_vc4_dev(dev);
 309         struct vc4_bo *bo = to_vc4_bo(gem_bo);
 310         struct list_head *cache_list;
 311
 312         mutex_lock(&vc4->bo_lock);
 313         /* If the object references someone else's memory, we can't cache it.
 314          */
 315         if (gem_bo->import_attach) {
 316                 vc4_bo_destroy(bo);
 317                 goto out;
 318         }
 319
 320         /* Don't cache if it was publicly named. */
 321         if (gem_bo->name) {
 322                 vc4_bo_destroy(bo);
 323                 goto out;
 324         }
 325
 326         /* If this object was partially constructed but CMA allocation
 327          * had failed, just free it.
 328          */
 329         if (!bo->base.vaddr) {
 330                 vc4_bo_destroy(bo);
 331                 goto out;
 332         }
 333
 334         cache_list = vc4_get_cache_list_for_size(dev, gem_bo->size);
 335         if (!cache_list) {
 336                 vc4_bo_destroy(bo);
 337                 goto out;
 338         }
 339
 340         if (bo->validated_shader) {
 341                 kfree(bo->validated_shader->texture_samples);
 342                 kfree(bo->validated_shader);
 343                 bo->validated_shader = NULL;
 344         }
 345
 346         bo->t_format = false;
 347         bo->free_time = jiffies;
 348         list_add(&bo->size_head, cache_list);
 349         list_add(&bo->unref_head, &vc4->bo_cache.time_list);
 350
 351         vc4->bo_stats.num_cached++;
 352         vc4->bo_stats.size_cached += gem_bo->size;
 353
 354         vc4_bo_cache_free_old(dev);
 355
 356 out:
 357         mutex_unlock(&vc4->bo_lock);
 358 }
 359
 360 static void vc4_bo_cache_time_work(struct work_struct *work)
 361 {
 362         struct vc4_dev *vc4 =
 363                 container_of(work, struct vc4_dev, bo_cache.time_work);
 364         struct drm_device *dev = vc4->dev;
 365
 366         mutex_lock(&vc4->bo_lock);
 367         vc4_bo_cache_free_old(dev);
 368         mutex_unlock(&vc4->bo_lock);
 369 }
 370
 371 static void vc4_bo_cache_time_timer(unsigned long data)
 372 {
 373         struct drm_device *dev = (struct drm_device *)data;
 374         struct vc4_dev *vc4 = to_vc4_dev(dev);
 375
 376         schedule_work(&vc4->bo_cache.time_work);
 377 }
 378
 379 struct reservation_object *vc4_prime_res_obj(struct drm_gem_object *obj)
 380 {
 381         struct vc4_bo *bo = to_vc4_bo(obj);
 382
 383         return bo->resv;
 384 }
 385
 386 struct dma_buf *
 387 vc4_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags)
 388 {
 389         struct vc4_bo *bo = to_vc4_bo(obj);
 390
 391         if (bo->validated_shader) {
 392                 DRM_ERROR("Attempting to export shader BO\n");
 393                 return ERR_PTR(-EINVAL);
 394         }
 395
 396         return drm_gem_prime_export(dev, obj, flags);
 397 }
 398
 399 int vc4_mmap(struct file *filp, struct vm_area_struct *vma)
 400 {
 401         struct drm_gem_object *gem_obj;
 402         struct vc4_bo *bo;
 403         int ret;
 404
 405         ret = drm_gem_mmap(filp, vma);
 406         if (ret)
 407                 return ret;
 408
 409         gem_obj = vma->vm_private_data;
 410         bo = to_vc4_bo(gem_obj);
 411
 412         if (bo->validated_shader && (vma->vm_flags & VM_WRITE)) {
 413                 DRM_ERROR("mmaping of shader BOs for writing not allowed.\n");
 414                 return -EINVAL;
 415         }
 416
 417         /*
 418          * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
 419          * vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map
 420          * the whole buffer.
 421          */
 422         vma->vm_flags &= ~VM_PFNMAP;
 423         vma->vm_pgoff = 0;
 424
 425         ret = dma_mmap_wc(bo->base.base.dev->dev, vma, bo->base.vaddr,
 426                           bo->base.paddr, vma->vm_end - vma->vm_start);
 427         if (ret)
 428                 drm_gem_vm_close(vma);
 429
 430         return ret;
 431 }
 432
 433 int vc4_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 434 {
 435         struct vc4_bo *bo = to_vc4_bo(obj);
 436
 437         if (bo->validated_shader && (vma->vm_flags & VM_WRITE)) {
 438                 DRM_ERROR("mmaping of shader BOs for writing not allowed.\n");
 439                 return -EINVAL;
 440         }
 441
 442         return drm_gem_cma_prime_mmap(obj, vma);
 443 }
 444
 445 void *vc4_prime_vmap(struct drm_gem_object *obj)
 446 {
 447         struct vc4_bo *bo = to_vc4_bo(obj);
 448
 449         if (bo->validated_shader) {
 450                 DRM_ERROR("mmaping of shader BOs not allowed.\n");
 451                 return ERR_PTR(-EINVAL);
 452         }
 453
 454         return drm_gem_cma_prime_vmap(obj);
 455 }
 456
 457 struct drm_gem_object *
 458 vc4_prime_import_sg_table(struct drm_device *dev,
 459                           struct dma_buf_attachment *attach,
 460                           struct sg_table *sgt)
 461 {
 462         struct drm_gem_object *obj;
 463         struct vc4_bo *bo;
 464
 465         obj = drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
 466         if (IS_ERR(obj))
 467                 return obj;
 468
 469         bo = to_vc4_bo(obj);
 470         bo->resv = attach->dmabuf->resv;
 471
 472         return obj;
 473 }
 474
 475 int vc4_create_bo_ioctl(struct drm_device *dev, void *data,
 476                         struct drm_file *file_priv)
 477 {
 478         struct drm_vc4_create_bo *args = data;
 479         struct vc4_bo *bo = NULL;
 480         int ret;
 481
 482         /*
 483          * We can't allocate from the BO cache, because the BOs don't
 484          * get zeroed, and that might leak data between users.
 485          */
 486         bo = vc4_bo_create(dev, args->size, false);
 487         if (IS_ERR(bo))
 488                 return PTR_ERR(bo);
 489
 490         ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
 491         drm_gem_object_unreference_unlocked(&bo->base.base);
 492
 493         return ret;
 494 }
 495
 496 int vc4_mmap_bo_ioctl(struct drm_device *dev, void *data,
 497                       struct drm_file *file_priv)
 498 {
 499         struct drm_vc4_mmap_bo *args = data;
 500         struct drm_gem_object *gem_obj;
 501
 502         gem_obj = drm_gem_object_lookup(file_priv, args->handle);
 503         if (!gem_obj) {
 504                 DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
 505                 return -EINVAL;
 506         }
 507
 508         /* The mmap offset was set up at BO allocation time. */
 509         args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
 510
 511         drm_gem_object_unreference_unlocked(gem_obj);
 512         return 0;
 513 }
 514
 515 int
 516 vc4_create_shader_bo_ioctl(struct drm_device *dev, void *data,
 517                            struct drm_file *file_priv)
 518 {
 519         struct drm_vc4_create_shader_bo *args = data;
 520         struct vc4_bo *bo = NULL;
 521         int ret;
 522
 523         if (args->size == 0)
 524                 return -EINVAL;
 525
 526         if (args->size % sizeof(u64) != 0)
 527                 return -EINVAL;
 528
 529         if (args->flags != 0) {
 530                 DRM_INFO("Unknown flags set: 0x%08x\n", args->flags);
 531                 return -EINVAL;
 532         }
 533
 534         if (args->pad != 0) {
 535                 DRM_INFO("Pad set: 0x%08x\n", args->pad);
 536                 return -EINVAL;
 537         }
 538
 539         bo = vc4_bo_create(dev, args->size, true);
 540         if (IS_ERR(bo))
 541                 return PTR_ERR(bo);
 542
 543         if (copy_from_user(bo->base.vaddr,
 544                              (void __user *)(uintptr_t)args->data,
 545                              args->size)) {
 546                 ret = -EFAULT;
 547                 goto fail;
 548         }
 549         /* Clear the rest of the memory from allocating from the BO
 550          * cache.
 551          */
 552         memset(bo->base.vaddr + args->size, 0,
 553                bo->base.base.size - args->size);
 554
 555         bo->validated_shader = vc4_validate_shader(&bo->base);
 556         if (!bo->validated_shader) {
 557                 ret = -EINVAL;
 558                 goto fail;
 559         }
 560
 561         /* We have to create the handle after validation, to avoid
 562          * races for users to do doing things like mmap the shader BO.
 563          */
 564         ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
 565
 566  fail:
 567         drm_gem_object_unreference_unlocked(&bo->base.base);
 568
 569         return ret;
 570 }
 571
 572 /**
 573  * vc4_set_tiling_ioctl() - Sets the tiling modifier for a BO.
 574  * @dev: DRM device
 575  * @data: ioctl argument
 576  * @file_priv: DRM file for this fd
 577  *
 578  * The tiling state of the BO decides the default modifier of an fb if
 579  * no specific modifier was set by userspace, and the return value of
 580  * vc4_get_tiling_ioctl() (so that userspace can treat a BO it
 581  * received from dmabuf as the same tiling format as the producer
 582  * used).
 583  */
 584 int vc4_set_tiling_ioctl(struct drm_device *dev, void *data,
 585                          struct drm_file *file_priv)
 586 {
 587         struct drm_vc4_set_tiling *args = data;
 588         struct drm_gem_object *gem_obj;
 589         struct vc4_bo *bo;
 590         bool t_format;
 591
 592         if (args->flags != 0)
 593                 return -EINVAL;
 594
 595         switch (args->modifier) {
 596         case DRM_FORMAT_MOD_NONE:
 597                 t_format = false;
 598                 break;
 599         case DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED:
 600                 t_format = true;
 601                 break;
 602         default:
 603                 return -EINVAL;
 604         }
 605
 606         gem_obj = drm_gem_object_lookup(file_priv, args->handle);
 607         if (!gem_obj) {
 608                 DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
 609                 return -ENOENT;
 610         }
 611         bo = to_vc4_bo(gem_obj);
 612         bo->t_format = t_format;
 613
 614         drm_gem_object_unreference_unlocked(gem_obj);
 615
 616         return 0;
 617 }
 618
 619 /**
 620  * vc4_get_tiling_ioctl() - Gets the tiling modifier for a BO.
 621  * @dev: DRM device
 622  * @data: ioctl argument
 623  * @file_priv: DRM file for this fd
 624  *
 625  * Returns the tiling modifier for a BO as set by vc4_set_tiling_ioctl().
 626  */
 627 int vc4_get_tiling_ioctl(struct drm_device *dev, void *data,
 628                          struct drm_file *file_priv)
 629 {
 630         struct drm_vc4_get_tiling *args = data;
 631         struct drm_gem_object *gem_obj;
 632         struct vc4_bo *bo;
 633
 634         if (args->flags != 0 || args->modifier != 0)
 635                 return -EINVAL;
 636
 637         gem_obj = drm_gem_object_lookup(file_priv, args->handle);
 638         if (!gem_obj) {
 639                 DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
 640                 return -ENOENT;
 641         }
 642         bo = to_vc4_bo(gem_obj);
 643
 644         if (bo->t_format)
 645                 args->modifier = DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED;
 646         else
 647                 args->modifier = DRM_FORMAT_MOD_NONE;
 648
 649         drm_gem_object_unreference_unlocked(gem_obj);
 650
 651         return 0;
 652 }
 653
 654 void vc4_bo_cache_init(struct drm_device *dev)
 655 {
 656         struct vc4_dev *vc4 = to_vc4_dev(dev);
 657
 658         mutex_init(&vc4->bo_lock);
 659
 660         INIT_LIST_HEAD(&vc4->bo_cache.time_list);
 661
 662         INIT_WORK(&vc4->bo_cache.time_work, vc4_bo_cache_time_work);
 663         setup_timer(&vc4->bo_cache.time_timer,
 664                     vc4_bo_cache_time_timer,
 665                     (unsigned long)dev);
 666 }
 667
 668 void vc4_bo_cache_destroy(struct drm_device *dev)
 669 {
 670         struct vc4_dev *vc4 = to_vc4_dev(dev);
 671
 672         del_timer(&vc4->bo_cache.time_timer);
 673         cancel_work_sync(&vc4->bo_cache.time_work);
 674
 675         vc4_bo_cache_purge(dev);
 676
 677         if (vc4->bo_stats.num_allocated) {
 678                 DRM_ERROR("Destroying BO cache while BOs still allocated:\n");
 679                 vc4_bo_stats_dump(vc4);
 680         }
 681 }