drivers/gpu/drm/radeon/radeon_object.c

   1 /*
   2  * Copyright 2009 Jerome Glisse.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * The above copyright notice and this permission notice (including the
  22  * next paragraph) shall be included in all copies or substantial portions
  23  * of the Software.
  24  *
  25  */
  26 /*
  27  * Authors:
  28  *    Jerome Glisse <glisse@freedesktop.org>
  29  *    Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
  30  *    Dave Airlie
  31  */
  32 #include <linux/list.h>
  33 #include <linux/slab.h>
  34 #include <drm/drmP.h>
  35 #include "radeon_drm.h"
  36 #include "radeon.h"
  37 #include "radeon_trace.h"
  38
  39
  40 int radeon_ttm_init(struct radeon_device *rdev);
  41 void radeon_ttm_fini(struct radeon_device *rdev);
  42 static void radeon_bo_clear_surface_reg(struct radeon_bo *bo);
  43
  44 /*
  45  * To exclude mutual BO access we rely on bo_reserve exclusion, as all
  46  * function are calling it.
  47  */
  48
  49 void radeon_bo_clear_va(struct radeon_bo *bo)
  50 {
  51         struct radeon_bo_va *bo_va, *tmp;
  52
  53         list_for_each_entry_safe(bo_va, tmp, &bo->va, bo_list) {
  54                 /* remove from all vm address space */
  55                 mutex_lock(&bo_va->vm->mutex);
  56                 list_del(&bo_va->vm_list);
  57                 mutex_unlock(&bo_va->vm->mutex);
  58                 list_del(&bo_va->bo_list);
  59                 kfree(bo_va);
  60         }
  61 }
  62
  63 static void radeon_ttm_bo_destroy(struct ttm_buffer_object *tbo)
  64 {
  65         struct radeon_bo *bo;
  66
  67         bo = container_of(tbo, struct radeon_bo, tbo);
  68         mutex_lock(&bo->rdev->gem.mutex);
  69         list_del_init(&bo->list);
  70         mutex_unlock(&bo->rdev->gem.mutex);
  71         radeon_bo_clear_surface_reg(bo);
  72         radeon_bo_clear_va(bo);
  73         drm_gem_object_release(&bo->gem_base);
  74         kfree(bo);
  75 }
  76
  77 bool radeon_ttm_bo_is_radeon_bo(struct ttm_buffer_object *bo)
  78 {
  79         if (bo->destroy == &radeon_ttm_bo_destroy)
  80                 return true;
  81         return false;
  82 }
  83
  84 void radeon_ttm_placement_from_domain(struct radeon_bo *rbo, u32 domain)
  85 {
  86         u32 c = 0;
  87
  88         rbo->placement.fpfn = 0;
  89         rbo->placement.lpfn = 0;
  90         rbo->placement.placement = rbo->placements;
  91         rbo->placement.busy_placement = rbo->placements;
  92         if (domain & RADEON_GEM_DOMAIN_VRAM)
  93                 rbo->placements[c++] = TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED |
  94                                         TTM_PL_FLAG_VRAM;
  95         if (domain & RADEON_GEM_DOMAIN_GTT)
  96                 rbo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
  97         if (domain & RADEON_GEM_DOMAIN_CPU)
  98                 rbo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
  99         if (!c)
 100                 rbo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
 101         rbo->placement.num_placement = c;
 102         rbo->placement.num_busy_placement = c;
 103 }
 104
 105 int radeon_bo_create(struct radeon_device *rdev,
 106                      unsigned long size, int byte_align, bool kernel, u32 domain,
 107                      struct radeon_bo **bo_ptr)
 108 {
 109         struct radeon_bo *bo;
 110         enum ttm_bo_type type;
 111         unsigned long page_align = roundup(byte_align, PAGE_SIZE) >> PAGE_SHIFT;
 112         unsigned long max_size = 0;
 113         size_t acc_size;
 114         int r;
 115
 116         size = ALIGN(size, PAGE_SIZE);
 117
 118         if (unlikely(rdev->mman.bdev.dev_mapping == NULL)) {
 119                 rdev->mman.bdev.dev_mapping = rdev->ddev->dev_mapping;
 120         }
 121         if (kernel) {
 122                 type = ttm_bo_type_kernel;
 123         } else {
 124                 type = ttm_bo_type_device;
 125         }
 126         *bo_ptr = NULL;
 127
 128         /* maximun bo size is the minimun btw visible vram and gtt size */
 129         max_size = min(rdev->mc.visible_vram_size, rdev->mc.gtt_size);
 130         if ((page_align << PAGE_SHIFT) >= max_size) {
 131                 printk(KERN_WARNING "%s:%d alloc size %ldM bigger than %ldMb limit\n",
 132                         __func__, __LINE__, page_align  >> (20 - PAGE_SHIFT), max_size >> 20);
 133                 return -ENOMEM;
 134         }
 135
 136         acc_size = ttm_bo_dma_acc_size(&rdev->mman.bdev, size,
 137                                        sizeof(struct radeon_bo));
 138
 139 retry:
 140         bo = kzalloc(sizeof(struct radeon_bo), GFP_KERNEL);
 141         if (bo == NULL)
 142                 return -ENOMEM;
 143         r = drm_gem_object_init(rdev->ddev, &bo->gem_base, size);
 144         if (unlikely(r)) {
 145                 kfree(bo);
 146                 return r;
 147         }
 148         bo->rdev = rdev;
 149         bo->gem_base.driver_private = NULL;
 150         bo->surface_reg = -1;
 151         INIT_LIST_HEAD(&bo->list);
 152         INIT_LIST_HEAD(&bo->va);
 153         radeon_ttm_placement_from_domain(bo, domain);
 154         /* Kernel allocation are uninterruptible */
 155         mutex_lock(&rdev->vram_mutex);
 156         r = ttm_bo_init(&rdev->mman.bdev, &bo->tbo, size, type,
 157                         &bo->placement, page_align, 0, !kernel, NULL,
 158                         acc_size, &radeon_ttm_bo_destroy);
 159         mutex_unlock(&rdev->vram_mutex);
 160         if (unlikely(r != 0)) {
 161                 if (r != -ERESTARTSYS) {
 162                         if (domain == RADEON_GEM_DOMAIN_VRAM) {
 163                                 domain |= RADEON_GEM_DOMAIN_GTT;
 164                                 goto retry;
 165                         }
 166                         dev_err(rdev->dev,
 167                                 "object_init failed for (%lu, 0x%08X)\n",
 168                                 size, domain);
 169                 }
 170                 return r;
 171         }
 172         *bo_ptr = bo;
 173
 174         trace_radeon_bo_create(bo);
 175
 176         return 0;
 177 }
 178
 179 int radeon_bo_kmap(struct radeon_bo *bo, void **ptr)
 180 {
 181         bool is_iomem;
 182         int r;
 183
 184         if (bo->kptr) {
 185                 if (ptr) {
 186                         *ptr = bo->kptr;
 187                 }
 188                 return 0;
 189         }
 190         r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
 191         if (r) {
 192                 return r;
 193         }
 194         bo->kptr = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
 195         if (ptr) {
 196                 *ptr = bo->kptr;
 197         }
 198         radeon_bo_check_tiling(bo, 0, 0);
 199         return 0;
 200 }
 201
 202 void radeon_bo_kunmap(struct radeon_bo *bo)
 203 {
 204         if (bo->kptr == NULL)
 205                 return;
 206         bo->kptr = NULL;
 207         radeon_bo_check_tiling(bo, 0, 0);
 208         ttm_bo_kunmap(&bo->kmap);
 209 }
 210
 211 void radeon_bo_unref(struct radeon_bo **bo)
 212 {
 213         struct ttm_buffer_object *tbo;
 214         struct radeon_device *rdev;
 215
 216         if ((*bo) == NULL)
 217                 return;
 218         rdev = (*bo)->rdev;
 219         tbo = &((*bo)->tbo);
 220         mutex_lock(&rdev->vram_mutex);
 221         ttm_bo_unref(&tbo);
 222         mutex_unlock(&rdev->vram_mutex);
 223         if (tbo == NULL)
 224                 *bo = NULL;
 225 }
 226
 227 int radeon_bo_pin_restricted(struct radeon_bo *bo, u32 domain, u64 max_offset,
 228                              u64 *gpu_addr)
 229 {
 230         int r, i;
 231
 232         if (bo->pin_count) {
 233                 bo->pin_count++;
 234                 if (gpu_addr)
 235                         *gpu_addr = radeon_bo_gpu_offset(bo);
 236                 WARN_ON_ONCE(max_offset != 0);
 237                 return 0;
 238         }
 239         radeon_ttm_placement_from_domain(bo, domain);
 240         if (domain == RADEON_GEM_DOMAIN_VRAM) {
 241                 /* force to pin into visible video ram */
 242                 bo->placement.lpfn = bo->rdev->mc.visible_vram_size >> PAGE_SHIFT;
 243         }
 244         if (max_offset) {
 245                 u64 lpfn = max_offset >> PAGE_SHIFT;
 246
 247                 if (!bo->placement.lpfn)
 248                         bo->placement.lpfn = bo->rdev->mc.gtt_size >> PAGE_SHIFT;
 249
 250                 if (lpfn < bo->placement.lpfn)
 251                         bo->placement.lpfn = lpfn;
 252         }
 253         for (i = 0; i < bo->placement.num_placement; i++)
 254                 bo->placements[i] |= TTM_PL_FLAG_NO_EVICT;
 255         r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false, false);
 256         if (likely(r == 0)) {
 257                 bo->pin_count = 1;
 258                 if (gpu_addr != NULL)
 259                         *gpu_addr = radeon_bo_gpu_offset(bo);
 260         }
 261         if (unlikely(r != 0))
 262                 dev_err(bo->rdev->dev, "%p pin failed\n", bo);
 263         return r;
 264 }
 265
 266 int radeon_bo_pin(struct radeon_bo *bo, u32 domain, u64 *gpu_addr)
 267 {
 268         return radeon_bo_pin_restricted(bo, domain, 0, gpu_addr);
 269 }
 270
 271 int radeon_bo_unpin(struct radeon_bo *bo)
 272 {
 273         int r, i;
 274
 275         if (!bo->pin_count) {
 276                 dev_warn(bo->rdev->dev, "%p unpin not necessary\n", bo);
 277                 return 0;
 278         }
 279         bo->pin_count--;
 280         if (bo->pin_count)
 281                 return 0;
 282         for (i = 0; i < bo->placement.num_placement; i++)
 283                 bo->placements[i] &= ~TTM_PL_FLAG_NO_EVICT;
 284         r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false, false);
 285         if (unlikely(r != 0))
 286                 dev_err(bo->rdev->dev, "%p validate failed for unpin\n", bo);
 287         return r;
 288 }
 289
 290 int radeon_bo_evict_vram(struct radeon_device *rdev)
 291 {
 292         /* late 2.6.33 fix IGP hibernate - we need pm ops to do this correct */
 293         if (0 && (rdev->flags & RADEON_IS_IGP)) {
 294                 if (rdev->mc.igp_sideport_enabled == false)
 295                         /* Useless to evict on IGP chips */
 296                         return 0;
 297         }
 298         return ttm_bo_evict_mm(&rdev->mman.bdev, TTM_PL_VRAM);
 299 }
 300
 301 void radeon_bo_force_delete(struct radeon_device *rdev)
 302 {
 303         struct radeon_bo *bo, *n;
 304
 305         if (list_empty(&rdev->gem.objects)) {
 306                 return;
 307         }
 308         dev_err(rdev->dev, "Userspace still has active objects !\n");
 309         list_for_each_entry_safe(bo, n, &rdev->gem.objects, list) {
 310                 mutex_lock(&rdev->ddev->struct_mutex);
 311                 dev_err(rdev->dev, "%p %p %lu %lu force free\n",
 312                         &bo->gem_base, bo, (unsigned long)bo->gem_base.size,
 313                         *((unsigned long *)&bo->gem_base.refcount));
 314                 mutex_lock(&bo->rdev->gem.mutex);
 315                 list_del_init(&bo->list);
 316                 mutex_unlock(&bo->rdev->gem.mutex);
 317                 /* this should unref the ttm bo */
 318                 drm_gem_object_unreference(&bo->gem_base);
 319                 mutex_unlock(&rdev->ddev->struct_mutex);
 320         }
 321 }
 322
 323 int radeon_bo_init(struct radeon_device *rdev)
 324 {
 325         /* Add an MTRR for the VRAM */
 326         rdev->mc.vram_mtrr = mtrr_add(rdev->mc.aper_base, rdev->mc.aper_size,
 327                         MTRR_TYPE_WRCOMB, 1);
 328         DRM_INFO("Detected VRAM RAM=%lluM, BAR=%lluM\n",
 329                 rdev->mc.mc_vram_size >> 20,
 330                 (unsigned long long)rdev->mc.aper_size >> 20);
 331         DRM_INFO("RAM width %dbits %cDR\n",
 332                         rdev->mc.vram_width, rdev->mc.vram_is_ddr ? 'D' : 'S');
 333         return radeon_ttm_init(rdev);
 334 }
 335
 336 void radeon_bo_fini(struct radeon_device *rdev)
 337 {
 338         radeon_ttm_fini(rdev);
 339 }
 340
 341 void radeon_bo_list_add_object(struct radeon_bo_list *lobj,
 342                                 struct list_head *head)
 343 {
 344         if (lobj->wdomain) {
 345                 list_add(&lobj->tv.head, head);
 346         } else {
 347                 list_add_tail(&lobj->tv.head, head);
 348         }
 349 }
 350
 351 int radeon_bo_list_validate(struct list_head *head)
 352 {
 353         struct radeon_bo_list *lobj;
 354         struct radeon_bo *bo;
 355         u32 domain;
 356         int r;
 357
 358         r = ttm_eu_reserve_buffers(head);
 359         if (unlikely(r != 0)) {
 360                 return r;
 361         }
 362         list_for_each_entry(lobj, head, tv.head) {
 363                 bo = lobj->bo;
 364                 if (!bo->pin_count) {
 365                         domain = lobj->wdomain ? lobj->wdomain : lobj->rdomain;
 366
 367                 retry:
 368                         radeon_ttm_placement_from_domain(bo, domain);
 369                         r = ttm_bo_validate(&bo->tbo, &bo->placement,
 370                                                 true, false, false);
 371                         if (unlikely(r)) {
 372                                 if (r != -ERESTARTSYS && domain == RADEON_GEM_DOMAIN_VRAM) {
 373                                         domain |= RADEON_GEM_DOMAIN_GTT;
 374                                         goto retry;
 375                                 }
 376                                 return r;
 377                         }
 378                 }
 379                 lobj->gpu_offset = radeon_bo_gpu_offset(bo);
 380                 lobj->tiling_flags = bo->tiling_flags;
 381         }
 382         return 0;
 383 }
 384
 385 int radeon_bo_fbdev_mmap(struct radeon_bo *bo,
 386                              struct vm_area_struct *vma)
 387 {
 388         return ttm_fbdev_mmap(vma, &bo->tbo);
 389 }
 390
 391 int radeon_bo_get_surface_reg(struct radeon_bo *bo)
 392 {
 393         struct radeon_device *rdev = bo->rdev;
 394         struct radeon_surface_reg *reg;
 395         struct radeon_bo *old_object;
 396         int steal;
 397         int i;
 398
 399         BUG_ON(!atomic_read(&bo->tbo.reserved));
 400
 401         if (!bo->tiling_flags)
 402                 return 0;
 403
 404         if (bo->surface_reg >= 0) {
 405                 reg = &rdev->surface_regs[bo->surface_reg];
 406                 i = bo->surface_reg;
 407                 goto out;
 408         }
 409
 410         steal = -1;
 411         for (i = 0; i < RADEON_GEM_MAX_SURFACES; i++) {
 412
 413                 reg = &rdev->surface_regs[i];
 414                 if (!reg->bo)
 415                         break;
 416
 417                 old_object = reg->bo;
 418                 if (old_object->pin_count == 0)
 419                         steal = i;
 420         }
 421
 422         /* if we are all out */
 423         if (i == RADEON_GEM_MAX_SURFACES) {
 424                 if (steal == -1)
 425                         return -ENOMEM;
 426                 /* find someone with a surface reg and nuke their BO */
 427                 reg = &rdev->surface_regs[steal];
 428                 old_object = reg->bo;
 429                 /* blow away the mapping */
 430                 DRM_DEBUG("stealing surface reg %d from %p\n", steal, old_object);
 431                 ttm_bo_unmap_virtual(&old_object->tbo);
 432                 old_object->surface_reg = -1;
 433                 i = steal;
 434         }
 435
 436         bo->surface_reg = i;
 437         reg->bo = bo;
 438
 439 out:
 440         radeon_set_surface_reg(rdev, i, bo->tiling_flags, bo->pitch,
 441                                bo->tbo.mem.start << PAGE_SHIFT,
 442                                bo->tbo.num_pages << PAGE_SHIFT);
 443         return 0;
 444 }
 445
 446 static void radeon_bo_clear_surface_reg(struct radeon_bo *bo)
 447 {
 448         struct radeon_device *rdev = bo->rdev;
 449         struct radeon_surface_reg *reg;
 450
 451         if (bo->surface_reg == -1)
 452                 return;
 453
 454         reg = &rdev->surface_regs[bo->surface_reg];
 455         radeon_clear_surface_reg(rdev, bo->surface_reg);
 456
 457         reg->bo = NULL;
 458         bo->surface_reg = -1;
 459 }
 460
 461 int radeon_bo_set_tiling_flags(struct radeon_bo *bo,
 462                                 uint32_t tiling_flags, uint32_t pitch)
 463 {
 464         int r;
 465
 466         r = radeon_bo_reserve(bo, false);
 467         if (unlikely(r != 0))
 468                 return r;
 469         bo->tiling_flags = tiling_flags;
 470         bo->pitch = pitch;
 471         radeon_bo_unreserve(bo);
 472         return 0;
 473 }
 474
 475 void radeon_bo_get_tiling_flags(struct radeon_bo *bo,
 476                                 uint32_t *tiling_flags,
 477                                 uint32_t *pitch)
 478 {
 479         BUG_ON(!atomic_read(&bo->tbo.reserved));
 480         if (tiling_flags)
 481                 *tiling_flags = bo->tiling_flags;
 482         if (pitch)
 483                 *pitch = bo->pitch;
 484 }
 485
 486 int radeon_bo_check_tiling(struct radeon_bo *bo, bool has_moved,
 487                                 bool force_drop)
 488 {
 489         BUG_ON(!atomic_read(&bo->tbo.reserved));
 490
 491         if (!(bo->tiling_flags & RADEON_TILING_SURFACE))
 492                 return 0;
 493
 494         if (force_drop) {
 495                 radeon_bo_clear_surface_reg(bo);
 496                 return 0;
 497         }
 498
 499         if (bo->tbo.mem.mem_type != TTM_PL_VRAM) {
 500                 if (!has_moved)
 501                         return 0;
 502
 503                 if (bo->surface_reg >= 0)
 504                         radeon_bo_clear_surface_reg(bo);
 505                 return 0;
 506         }
 507
 508         if ((bo->surface_reg >= 0) && !has_moved)
 509                 return 0;
 510
 511         return radeon_bo_get_surface_reg(bo);
 512 }
 513
 514 void radeon_bo_move_notify(struct ttm_buffer_object *bo,
 515                            struct ttm_mem_reg *mem)
 516 {
 517         struct radeon_bo *rbo;
 518         if (!radeon_ttm_bo_is_radeon_bo(bo))
 519                 return;
 520         rbo = container_of(bo, struct radeon_bo, tbo);
 521         radeon_bo_check_tiling(rbo, 0, 1);
 522         radeon_vm_bo_invalidate(rbo->rdev, rbo);
 523 }
 524
 525 int radeon_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
 526 {
 527         struct radeon_device *rdev;
 528         struct radeon_bo *rbo;
 529         unsigned long offset, size;
 530         int r;
 531
 532         if (!radeon_ttm_bo_is_radeon_bo(bo))
 533                 return 0;
 534         rbo = container_of(bo, struct radeon_bo, tbo);
 535         radeon_bo_check_tiling(rbo, 0, 0);
 536         rdev = rbo->rdev;
 537         if (bo->mem.mem_type == TTM_PL_VRAM) {
 538                 size = bo->mem.num_pages << PAGE_SHIFT;
 539                 offset = bo->mem.start << PAGE_SHIFT;
 540                 if ((offset + size) > rdev->mc.visible_vram_size) {
 541                         /* hurrah the memory is not visible ! */
 542                         radeon_ttm_placement_from_domain(rbo, RADEON_GEM_DOMAIN_VRAM);
 543                         rbo->placement.lpfn = rdev->mc.visible_vram_size >> PAGE_SHIFT;
 544                         r = ttm_bo_validate(bo, &rbo->placement, false, true, false);
 545                         if (unlikely(r != 0))
 546                                 return r;
 547                         offset = bo->mem.start << PAGE_SHIFT;
 548                         /* this should not happen */
 549                         if ((offset + size) > rdev->mc.visible_vram_size)
 550                                 return -EINVAL;
 551                 }
 552         }
 553         return 0;
 554 }
 555
 556 int radeon_bo_wait(struct radeon_bo *bo, u32 *mem_type, bool no_wait)
 557 {
 558         int r;
 559
 560         r = ttm_bo_reserve(&bo->tbo, true, no_wait, false, 0);
 561         if (unlikely(r != 0))
 562                 return r;
 563         spin_lock(&bo->tbo.bdev->fence_lock);
 564         if (mem_type)
 565                 *mem_type = bo->tbo.mem.mem_type;
 566         if (bo->tbo.sync_obj)
 567                 r = ttm_bo_wait(&bo->tbo, true, true, no_wait);
 568         spin_unlock(&bo->tbo.bdev->fence_lock);
 569         ttm_bo_unreserve(&bo->tbo);
 570         return r;
 571 }
 572
 573
 574 /**
 575  * radeon_bo_reserve - reserve bo
 576  * @bo:         bo structure
 577  * @no_wait:            don't sleep while trying to reserve (return -EBUSY)
 578  *
 579  * Returns:
 580  * -EBUSY: buffer is busy and @no_wait is true
 581  * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
 582  * a signal. Release all buffer reservations and return to user-space.
 583  */
 584 int radeon_bo_reserve(struct radeon_bo *bo, bool no_wait)
 585 {
 586         int r;
 587
 588         r = ttm_bo_reserve(&bo->tbo, true, no_wait, false, 0);
 589         if (unlikely(r != 0)) {
 590                 if (r != -ERESTARTSYS)
 591                         dev_err(bo->rdev->dev, "%p reserve failed\n", bo);
 592                 return r;
 593         }
 594         return 0;
 595 }
 596
 597 /* object have to be reserved */
 598 struct radeon_bo_va *radeon_bo_va(struct radeon_bo *rbo, struct radeon_vm *vm)
 599 {
 600         struct radeon_bo_va *bo_va;
 601
 602         list_for_each_entry(bo_va, &rbo->va, bo_list) {
 603                 if (bo_va->vm == vm) {
 604                         return bo_va;
 605                 }
 606         }
 607         return NULL;
 608 }