drv.c

   1 /*
   2  * Copyright 2016 The Chromium OS Authors. All rights reserved.
   3  * Use of this source code is governed by a BSD-style license that can be
   4  * found in the LICENSE file.
   5  */
   6 #include <assert.h>
   7 #include <errno.h>
   8 #include <fcntl.h>
   9 #include <pthread.h>
  10 #include <stdint.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/mman.h>
  15 #include <sys/types.h>
  16 #include <unistd.h>
  17 #include <xf86drm.h>
  18
  19 #ifdef __ANDROID__
  20 #include <cutils/log.h>
  21 #include <libgen.h>
  22 #endif
  23
  24 #include "drv_priv.h"
  25 #include "helpers.h"
  26 #include "util.h"
  27
  28 #ifdef DRV_AMDGPU
  29 extern const struct backend backend_amdgpu;
  30 #endif
  31 #ifdef DRV_EXYNOS
  32 extern const struct backend backend_exynos;
  33 #endif
  34 #ifdef DRV_I915
  35 extern const struct backend backend_i915;
  36 #endif
  37 #ifdef DRV_MEDIATEK
  38 extern const struct backend backend_mediatek;
  39 #endif
  40 #ifdef DRV_MSM
  41 extern const struct backend backend_msm;
  42 #endif
  43 #ifdef DRV_ROCKCHIP
  44 extern const struct backend backend_rockchip;
  45 #endif
  46 #ifdef DRV_TEGRA
  47 extern const struct backend backend_tegra;
  48 #endif
  49 #ifdef DRV_VC4
  50 extern const struct backend backend_vc4;
  51 #endif
  52
  53 // Dumb / generic drivers
  54 extern const struct backend backend_evdi;
  55 extern const struct backend backend_marvell;
  56 extern const struct backend backend_meson;
  57 extern const struct backend backend_nouveau;
  58 extern const struct backend backend_komeda;
  59 extern const struct backend backend_radeon;
  60 extern const struct backend backend_synaptics;
  61 extern const struct backend backend_virtio_gpu;
  62 extern const struct backend backend_udl;
  63 extern const struct backend backend_vkms;
  64
  65 static const struct backend *drv_get_backend(int fd)
  66 {
  67         drmVersionPtr drm_version;
  68         unsigned int i;
  69
  70         drm_version = drmGetVersion(fd);
  71
  72         if (!drm_version)
  73                 return NULL;
  74
  75         const struct backend *backend_list[] = {
  76 #ifdef DRV_AMDGPU
  77                 &backend_amdgpu,
  78 #endif
  79 #ifdef DRV_EXYNOS
  80                 &backend_exynos,
  81 #endif
  82 #ifdef DRV_I915
  83                 &backend_i915,
  84 #endif
  85 #ifdef DRV_MEDIATEK
  86                 &backend_mediatek,
  87 #endif
  88 #ifdef DRV_MSM
  89                 &backend_msm,
  90 #endif
  91 #ifdef DRV_ROCKCHIP
  92                 &backend_rockchip,
  93 #endif
  94 #ifdef DRV_VC4
  95                 &backend_vc4,
  96 #endif
  97                 &backend_evdi,     &backend_marvell,    &backend_meson,     &backend_nouveau,
  98                 &backend_komeda,   &backend_radeon,     &backend_synaptics, &backend_virtio_gpu,
  99                 &backend_udl,      &backend_virtio_gpu, &backend_vkms
 100         };
 101
 102         for (i = 0; i < ARRAY_SIZE(backend_list); i++) {
 103                 const struct backend *b = backend_list[i];
 104                 // Exactly one of the main create functions must be defined.
 105                 assert((b->bo_create != NULL) ^ (b->bo_create_from_metadata != NULL));
 106                 // Either both or neither must be implemented.
 107                 assert((b->bo_compute_metadata != NULL) == (b->bo_create_from_metadata != NULL));
 108                 // Both can't be defined, but it's okay for neither to be (i.e. only bo_create).
 109                 assert((b->bo_create_with_modifiers == NULL) ||
 110                        (b->bo_create_from_metadata == NULL));
 111
 112                 if (!strcmp(drm_version->name, b->name)) {
 113                         drmFreeVersion(drm_version);
 114                         return b;
 115                 }
 116         }
 117
 118         drmFreeVersion(drm_version);
 119         return NULL;
 120 }
 121
 122 struct driver *drv_create(int fd)
 123 {
 124         struct driver *drv;
 125         int ret;
 126
 127         drv = (struct driver *)calloc(1, sizeof(*drv));
 128
 129         if (!drv)
 130                 return NULL;
 131
 132         char *minigbm_debug;
 133         minigbm_debug = getenv("MINIGBM_DEBUG");
 134         drv->compression = (minigbm_debug == NULL) || (strcmp(minigbm_debug, "nocompression") != 0);
 135
 136         drv->fd = fd;
 137         drv->backend = drv_get_backend(fd);
 138
 139         if (!drv->backend)
 140                 goto free_driver;
 141
 142         if (pthread_mutex_init(&drv->driver_lock, NULL))
 143                 goto free_driver;
 144
 145         drv->buffer_table = drmHashCreate();
 146         if (!drv->buffer_table)
 147                 goto free_lock;
 148
 149         drv->mappings = drv_array_init(sizeof(struct mapping));
 150         if (!drv->mappings)
 151                 goto free_buffer_table;
 152
 153         drv->combos = drv_array_init(sizeof(struct combination));
 154         if (!drv->combos)
 155                 goto free_mappings;
 156
 157         if (drv->backend->init) {
 158                 ret = drv->backend->init(drv);
 159                 if (ret) {
 160                         drv_array_destroy(drv->combos);
 161                         goto free_mappings;
 162                 }
 163         }
 164
 165         return drv;
 166
 167 free_mappings:
 168         drv_array_destroy(drv->mappings);
 169 free_buffer_table:
 170         drmHashDestroy(drv->buffer_table);
 171 free_lock:
 172         pthread_mutex_destroy(&drv->driver_lock);
 173 free_driver:
 174         free(drv);
 175         return NULL;
 176 }
 177
 178 void drv_destroy(struct driver *drv)
 179 {
 180         pthread_mutex_lock(&drv->driver_lock);
 181
 182         if (drv->backend->close)
 183                 drv->backend->close(drv);
 184
 185         drmHashDestroy(drv->buffer_table);
 186         drv_array_destroy(drv->mappings);
 187         drv_array_destroy(drv->combos);
 188
 189         pthread_mutex_unlock(&drv->driver_lock);
 190         pthread_mutex_destroy(&drv->driver_lock);
 191
 192         free(drv);
 193 }
 194
 195 int drv_get_fd(struct driver *drv)
 196 {
 197         return drv->fd;
 198 }
 199
 200 const char *drv_get_name(struct driver *drv)
 201 {
 202         return drv->backend->name;
 203 }
 204
 205 struct combination *drv_get_combination(struct driver *drv, uint32_t format, uint64_t use_flags)
 206 {
 207         struct combination *curr, *best;
 208
 209         if (format == DRM_FORMAT_NONE || use_flags == BO_USE_NONE)
 210                 return 0;
 211
 212         best = NULL;
 213         uint32_t i;
 214         for (i = 0; i < drv_array_size(drv->combos); i++) {
 215                 curr = drv_array_at_idx(drv->combos, i);
 216                 if ((format == curr->format) && use_flags == (curr->use_flags & use_flags))
 217                         if (!best || best->metadata.priority < curr->metadata.priority)
 218                                 best = curr;
 219         }
 220
 221         return best;
 222 }
 223
 224 struct bo *drv_bo_new(struct driver *drv, uint32_t width, uint32_t height, uint32_t format,
 225                       uint64_t use_flags, bool is_test_buffer)
 226 {
 227
 228         struct bo *bo;
 229         bo = (struct bo *)calloc(1, sizeof(*bo));
 230
 231         if (!bo)
 232                 return NULL;
 233
 234         bo->drv = drv;
 235         bo->meta.width = width;
 236         bo->meta.height = height;
 237         bo->meta.format = format;
 238         bo->meta.use_flags = use_flags;
 239         bo->meta.num_planes = drv_num_planes_from_format(format);
 240         bo->is_test_buffer = is_test_buffer;
 241
 242         if (!bo->meta.num_planes) {
 243                 free(bo);
 244                 return NULL;
 245         }
 246
 247         return bo;
 248 }
 249
 250 struct bo *drv_bo_create(struct driver *drv, uint32_t width, uint32_t height, uint32_t format,
 251                          uint64_t use_flags)
 252 {
 253         int ret;
 254         size_t plane;
 255         struct bo *bo;
 256         bool is_test_alloc;
 257
 258         is_test_alloc = use_flags & BO_USE_TEST_ALLOC;
 259         use_flags &= ~BO_USE_TEST_ALLOC;
 260
 261         bo = drv_bo_new(drv, width, height, format, use_flags, is_test_alloc);
 262
 263         if (!bo)
 264                 return NULL;
 265
 266         ret = -EINVAL;
 267         if (drv->backend->bo_compute_metadata) {
 268                 ret = drv->backend->bo_compute_metadata(bo, width, height, format, use_flags, NULL,
 269                                                         0);
 270                 if (!is_test_alloc && ret == 0)
 271                         ret = drv->backend->bo_create_from_metadata(bo);
 272         } else if (!is_test_alloc) {
 273                 ret = drv->backend->bo_create(bo, width, height, format, use_flags);
 274         }
 275
 276         if (ret) {
 277                 free(bo);
 278                 return NULL;
 279         }
 280
 281         pthread_mutex_lock(&drv->driver_lock);
 282
 283         for (plane = 0; plane < bo->meta.num_planes; plane++) {
 284                 if (plane > 0)
 285                         assert(bo->meta.offsets[plane] >= bo->meta.offsets[plane - 1]);
 286
 287                 drv_increment_reference_count(drv, bo, plane);
 288         }
 289
 290         pthread_mutex_unlock(&drv->driver_lock);
 291
 292         return bo;
 293 }
 294
 295 struct bo *drv_bo_create_with_modifiers(struct driver *drv, uint32_t width, uint32_t height,
 296                                         uint32_t format, const uint64_t *modifiers, uint32_t count)
 297 {
 298         int ret;
 299         size_t plane;
 300         struct bo *bo;
 301
 302         if (!drv->backend->bo_create_with_modifiers && !drv->backend->bo_compute_metadata) {
 303                 errno = ENOENT;
 304                 return NULL;
 305         }
 306
 307         bo = drv_bo_new(drv, width, height, format, BO_USE_NONE, false);
 308
 309         if (!bo)
 310                 return NULL;
 311
 312         ret = -EINVAL;
 313         if (drv->backend->bo_compute_metadata) {
 314                 ret = drv->backend->bo_compute_metadata(bo, width, height, format, BO_USE_NONE,
 315                                                         modifiers, count);
 316                 if (ret == 0)
 317                         ret = drv->backend->bo_create_from_metadata(bo);
 318         } else {
 319                 ret = drv->backend->bo_create_with_modifiers(bo, width, height, format, modifiers,
 320                                                              count);
 321         }
 322
 323         if (ret) {
 324                 free(bo);
 325                 return NULL;
 326         }
 327
 328         pthread_mutex_lock(&drv->driver_lock);
 329
 330         for (plane = 0; plane < bo->meta.num_planes; plane++) {
 331                 if (plane > 0)
 332                         assert(bo->meta.offsets[plane] >= bo->meta.offsets[plane - 1]);
 333
 334                 drv_increment_reference_count(drv, bo, plane);
 335         }
 336
 337         pthread_mutex_unlock(&drv->driver_lock);
 338
 339         return bo;
 340 }
 341
 342 void drv_bo_destroy(struct bo *bo)
 343 {
 344         int ret;
 345         size_t plane;
 346         uintptr_t total = 0;
 347         struct driver *drv = bo->drv;
 348
 349         if (!bo->is_test_buffer) {
 350                 pthread_mutex_lock(&drv->driver_lock);
 351
 352                 for (plane = 0; plane < bo->meta.num_planes; plane++)
 353                         drv_decrement_reference_count(drv, bo, plane);
 354
 355                 for (plane = 0; plane < bo->meta.num_planes; plane++)
 356                         total += drv_get_reference_count(drv, bo, plane);
 357
 358                 pthread_mutex_unlock(&drv->driver_lock);
 359
 360                 if (total == 0) {
 361                         ret = drv_mapping_destroy(bo);
 362                         assert(ret == 0);
 363                         bo->drv->backend->bo_destroy(bo);
 364                 }
 365         }
 366
 367         free(bo);
 368 }
 369
 370 struct bo *drv_bo_import(struct driver *drv, struct drv_import_fd_data *data)
 371 {
 372         int ret;
 373         size_t plane;
 374         struct bo *bo;
 375         off_t seek_end;
 376
 377         bo = drv_bo_new(drv, data->width, data->height, data->format, data->use_flags, false);
 378
 379         if (!bo)
 380                 return NULL;
 381
 382         ret = drv->backend->bo_import(bo, data);
 383         if (ret) {
 384                 free(bo);
 385                 return NULL;
 386         }
 387
 388         for (plane = 0; plane < bo->meta.num_planes; plane++) {
 389                 pthread_mutex_lock(&bo->drv->driver_lock);
 390                 drv_increment_reference_count(bo->drv, bo, plane);
 391                 pthread_mutex_unlock(&bo->drv->driver_lock);
 392         }
 393
 394         for (plane = 0; plane < bo->meta.num_planes; plane++) {
 395                 bo->meta.strides[plane] = data->strides[plane];
 396                 bo->meta.offsets[plane] = data->offsets[plane];
 397                 bo->meta.format_modifiers[plane] = data->format_modifiers[plane];
 398
 399                 seek_end = lseek(data->fds[plane], 0, SEEK_END);
 400                 if (seek_end == (off_t)(-1)) {
 401                         drv_log("lseek() failed with %s\n", strerror(errno));
 402                         goto destroy_bo;
 403                 }
 404
 405                 lseek(data->fds[plane], 0, SEEK_SET);
 406                 if (plane == bo->meta.num_planes - 1 || data->offsets[plane + 1] == 0)
 407                         bo->meta.sizes[plane] = seek_end - data->offsets[plane];
 408                 else
 409                         bo->meta.sizes[plane] = data->offsets[plane + 1] - data->offsets[plane];
 410
 411                 if ((int64_t)bo->meta.offsets[plane] + bo->meta.sizes[plane] > seek_end) {
 412                         drv_log("buffer size is too large.\n");
 413                         goto destroy_bo;
 414                 }
 415
 416                 bo->meta.total_size += bo->meta.sizes[plane];
 417         }
 418
 419         return bo;
 420
 421 destroy_bo:
 422         drv_bo_destroy(bo);
 423         return NULL;
 424 }
 425
 426 void *drv_bo_map(struct bo *bo, const struct rectangle *rect, uint32_t map_flags,
 427                  struct mapping **map_data, size_t plane)
 428 {
 429         uint32_t i;
 430         uint8_t *addr;
 431         struct mapping mapping = { 0 };
 432
 433         assert(rect->width >= 0);
 434         assert(rect->height >= 0);
 435         assert(rect->x + rect->width <= drv_bo_get_width(bo));
 436         assert(rect->y + rect->height <= drv_bo_get_height(bo));
 437         assert(BO_MAP_READ_WRITE & map_flags);
 438         /* No CPU access for protected buffers. */
 439         assert(!(bo->meta.use_flags & BO_USE_PROTECTED));
 440
 441         if (bo->is_test_buffer) {
 442                 return MAP_FAILED;
 443         }
 444
 445         mapping.rect = *rect;
 446         mapping.refcount = 1;
 447
 448         pthread_mutex_lock(&bo->drv->driver_lock);
 449
 450         for (i = 0; i < drv_array_size(bo->drv->mappings); i++) {
 451                 struct mapping *prior = (struct mapping *)drv_array_at_idx(bo->drv->mappings, i);
 452                 if (prior->vma->handle != bo->handles[plane].u32 ||
 453                     prior->vma->map_flags != map_flags)
 454                         continue;
 455
 456                 if (rect->x != prior->rect.x || rect->y != prior->rect.y ||
 457                     rect->width != prior->rect.width || rect->height != prior->rect.height)
 458                         continue;
 459
 460                 prior->refcount++;
 461                 *map_data = prior;
 462                 goto exact_match;
 463         }
 464
 465         for (i = 0; i < drv_array_size(bo->drv->mappings); i++) {
 466                 struct mapping *prior = (struct mapping *)drv_array_at_idx(bo->drv->mappings, i);
 467                 if (prior->vma->handle != bo->handles[plane].u32 ||
 468                     prior->vma->map_flags != map_flags)
 469                         continue;
 470
 471                 prior->vma->refcount++;
 472                 mapping.vma = prior->vma;
 473                 goto success;
 474         }
 475
 476         mapping.vma = calloc(1, sizeof(*mapping.vma));
 477         memcpy(mapping.vma->map_strides, bo->meta.strides, sizeof(mapping.vma->map_strides));
 478         addr = bo->drv->backend->bo_map(bo, mapping.vma, plane, map_flags);
 479         if (addr == MAP_FAILED) {
 480                 *map_data = NULL;
 481                 free(mapping.vma);
 482                 pthread_mutex_unlock(&bo->drv->driver_lock);
 483                 return MAP_FAILED;
 484         }
 485
 486         mapping.vma->refcount = 1;
 487         mapping.vma->addr = addr;
 488         mapping.vma->handle = bo->handles[plane].u32;
 489         mapping.vma->map_flags = map_flags;
 490
 491 success:
 492         *map_data = drv_array_append(bo->drv->mappings, &mapping);
 493 exact_match:
 494         drv_bo_invalidate(bo, *map_data);
 495         addr = (uint8_t *)((*map_data)->vma->addr);
 496         addr += drv_bo_get_plane_offset(bo, plane);
 497         pthread_mutex_unlock(&bo->drv->driver_lock);
 498         return (void *)addr;
 499 }
 500
 501 int drv_bo_unmap(struct bo *bo, struct mapping *mapping)
 502 {
 503         uint32_t i;
 504         int ret = 0;
 505
 506         pthread_mutex_lock(&bo->drv->driver_lock);
 507
 508         if (--mapping->refcount)
 509                 goto out;
 510
 511         if (!--mapping->vma->refcount) {
 512                 ret = bo->drv->backend->bo_unmap(bo, mapping->vma);
 513                 free(mapping->vma);
 514         }
 515
 516         for (i = 0; i < drv_array_size(bo->drv->mappings); i++) {
 517                 if (mapping == (struct mapping *)drv_array_at_idx(bo->drv->mappings, i)) {
 518                         drv_array_remove(bo->drv->mappings, i);
 519                         break;
 520                 }
 521         }
 522
 523 out:
 524         pthread_mutex_unlock(&bo->drv->driver_lock);
 525         return ret;
 526 }
 527
 528 int drv_bo_invalidate(struct bo *bo, struct mapping *mapping)
 529 {
 530         int ret = 0;
 531
 532         assert(mapping);
 533         assert(mapping->vma);
 534         assert(mapping->refcount > 0);
 535         assert(mapping->vma->refcount > 0);
 536
 537         if (bo->drv->backend->bo_invalidate)
 538                 ret = bo->drv->backend->bo_invalidate(bo, mapping);
 539
 540         return ret;
 541 }
 542
 543 int drv_bo_flush(struct bo *bo, struct mapping *mapping)
 544 {
 545         int ret = 0;
 546
 547         assert(mapping);
 548         assert(mapping->vma);
 549         assert(mapping->refcount > 0);
 550         assert(mapping->vma->refcount > 0);
 551
 552         if (bo->drv->backend->bo_flush)
 553                 ret = bo->drv->backend->bo_flush(bo, mapping);
 554
 555         return ret;
 556 }
 557
 558 int drv_bo_flush_or_unmap(struct bo *bo, struct mapping *mapping)
 559 {
 560         int ret = 0;
 561
 562         assert(mapping);
 563         assert(mapping->vma);
 564         assert(mapping->refcount > 0);
 565         assert(mapping->vma->refcount > 0);
 566         assert(!(bo->meta.use_flags & BO_USE_PROTECTED));
 567
 568         if (bo->drv->backend->bo_flush)
 569                 ret = bo->drv->backend->bo_flush(bo, mapping);
 570         else
 571                 ret = drv_bo_unmap(bo, mapping);
 572
 573         return ret;
 574 }
 575
 576 uint32_t drv_bo_get_width(struct bo *bo)
 577 {
 578         return bo->meta.width;
 579 }
 580
 581 uint32_t drv_bo_get_height(struct bo *bo)
 582 {
 583         return bo->meta.height;
 584 }
 585
 586 size_t drv_bo_get_num_planes(struct bo *bo)
 587 {
 588         return bo->meta.num_planes;
 589 }
 590
 591 union bo_handle drv_bo_get_plane_handle(struct bo *bo, size_t plane)
 592 {
 593         return bo->handles[plane];
 594 }
 595
 596 #ifndef DRM_RDWR
 597 #define DRM_RDWR O_RDWR
 598 #endif
 599
 600 int drv_bo_get_plane_fd(struct bo *bo, size_t plane)
 601 {
 602
 603         int ret, fd;
 604         assert(plane < bo->meta.num_planes);
 605
 606         if (bo->is_test_buffer) {
 607                 return -EINVAL;
 608         }
 609
 610         ret = drmPrimeHandleToFD(bo->drv->fd, bo->handles[plane].u32, DRM_CLOEXEC | DRM_RDWR, &fd);
 611
 612         // Older DRM implementations blocked DRM_RDWR, but gave a read/write mapping anyways
 613         if (ret)
 614                 ret = drmPrimeHandleToFD(bo->drv->fd, bo->handles[plane].u32, DRM_CLOEXEC, &fd);
 615
 616         return (ret) ? ret : fd;
 617 }
 618
 619 uint32_t drv_bo_get_plane_offset(struct bo *bo, size_t plane)
 620 {
 621         assert(plane < bo->meta.num_planes);
 622         return bo->meta.offsets[plane];
 623 }
 624
 625 uint32_t drv_bo_get_plane_size(struct bo *bo, size_t plane)
 626 {
 627         assert(plane < bo->meta.num_planes);
 628         return bo->meta.sizes[plane];
 629 }
 630
 631 uint32_t drv_bo_get_plane_stride(struct bo *bo, size_t plane)
 632 {
 633         assert(plane < bo->meta.num_planes);
 634         return bo->meta.strides[plane];
 635 }
 636
 637 uint64_t drv_bo_get_plane_format_modifier(struct bo *bo, size_t plane)
 638 {
 639         assert(plane < bo->meta.num_planes);
 640         return bo->meta.format_modifiers[plane];
 641 }
 642
 643 uint32_t drv_bo_get_format(struct bo *bo)
 644 {
 645         return bo->meta.format;
 646 }
 647
 648 size_t drv_bo_get_total_size(struct bo *bo)
 649 {
 650         return bo->meta.total_size;
 651 }
 652
 653 uint32_t drv_resolve_format(struct driver *drv, uint32_t format, uint64_t use_flags)
 654 {
 655         if (drv->backend->resolve_format)
 656                 return drv->backend->resolve_format(drv, format, use_flags);
 657
 658         return format;
 659 }
 660
 661 uint32_t drv_num_buffers_per_bo(struct bo *bo)
 662 {
 663         uint32_t count = 0;
 664         size_t plane, p;
 665
 666         if (bo->is_test_buffer) {
 667                 return 0;
 668         }
 669
 670         for (plane = 0; plane < bo->meta.num_planes; plane++) {
 671                 for (p = 0; p < plane; p++)
 672                         if (bo->handles[p].u32 == bo->handles[plane].u32)
 673                                 break;
 674                 if (p == plane)
 675                         count++;
 676         }
 677
 678         return count;
 679 }
 680
 681 void drv_log_prefix(const char *prefix, const char *file, int line, const char *format, ...)
 682 {
 683         char buf[50];
 684         snprintf(buf, sizeof(buf), "[%s:%s(%d)]", prefix, basename(file), line);
 685
 686         va_list args;
 687         va_start(args, format);
 688 #ifdef __ANDROID__
 689         __android_log_vprint(ANDROID_LOG_ERROR, buf, format, args);
 690 #else
 691         fprintf(stderr, "%s ", buf);
 692         vfprintf(stderr, format, args);
 693 #endif
 694         va_end(args);
 695 }
 696
 697 int drv_resource_info(struct bo *bo, uint32_t strides[DRV_MAX_PLANES],
 698                       uint32_t offsets[DRV_MAX_PLANES])
 699 {
 700         for (uint32_t plane = 0; plane < bo->meta.num_planes; plane++) {
 701                 strides[plane] = bo->meta.strides[plane];
 702                 offsets[plane] = bo->meta.offsets[plane];
 703         }
 704
 705         if (bo->drv->backend->resource_info)
 706                 return bo->drv->backend->resource_info(bo, strides, offsets);
 707
 708         return 0;
 709 }