1
2
3#include <linux/dma-buf-map.h>
4#include <linux/module.h>
5
6#include <drm/drm_debugfs.h>
7#include <drm/drm_device.h>
8#include <drm/drm_drv.h>
9#include <drm/drm_file.h>
10#include <drm/drm_framebuffer.h>
11#include <drm/drm_gem_atomic_helper.h>
12#include <drm/drm_gem_ttm_helper.h>
13#include <drm/drm_gem_vram_helper.h>
14#include <drm/drm_managed.h>
15#include <drm/drm_mode.h>
16#include <drm/drm_plane.h>
17#include <drm/drm_prime.h>
18#include <drm/drm_simple_kms_helper.h>
19
20#include <drm/ttm/ttm_range_manager.h>
21
22static const struct drm_gem_object_funcs drm_gem_vram_object_funcs;
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111static void drm_gem_vram_cleanup(struct drm_gem_vram_object *gbo)
112{
113
114
115
116
117
118 WARN_ON(gbo->vmap_use_count);
119 WARN_ON(dma_buf_map_is_set(&gbo->map));
120
121 drm_gem_object_release(&gbo->bo.base);
122}
123
124static void drm_gem_vram_destroy(struct drm_gem_vram_object *gbo)
125{
126 drm_gem_vram_cleanup(gbo);
127 kfree(gbo);
128}
129
130static void ttm_buffer_object_destroy(struct ttm_buffer_object *bo)
131{
132 struct drm_gem_vram_object *gbo = drm_gem_vram_of_bo(bo);
133
134 drm_gem_vram_destroy(gbo);
135}
136
137static void drm_gem_vram_placement(struct drm_gem_vram_object *gbo,
138 unsigned long pl_flag)
139{
140 u32 invariant_flags = 0;
141 unsigned int i;
142 unsigned int c = 0;
143
144 if (pl_flag & DRM_GEM_VRAM_PL_FLAG_TOPDOWN)
145 invariant_flags = TTM_PL_FLAG_TOPDOWN;
146
147 gbo->placement.placement = gbo->placements;
148 gbo->placement.busy_placement = gbo->placements;
149
150 if (pl_flag & DRM_GEM_VRAM_PL_FLAG_VRAM) {
151 gbo->placements[c].mem_type = TTM_PL_VRAM;
152 gbo->placements[c++].flags = invariant_flags;
153 }
154
155 if (pl_flag & DRM_GEM_VRAM_PL_FLAG_SYSTEM || !c) {
156 gbo->placements[c].mem_type = TTM_PL_SYSTEM;
157 gbo->placements[c++].flags = invariant_flags;
158 }
159
160 gbo->placement.num_placement = c;
161 gbo->placement.num_busy_placement = c;
162
163 for (i = 0; i < c; ++i) {
164 gbo->placements[i].fpfn = 0;
165 gbo->placements[i].lpfn = 0;
166 }
167}
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183
184
185struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
186 size_t size,
187 unsigned long pg_align)
188{
189 struct drm_gem_vram_object *gbo;
190 struct drm_gem_object *gem;
191 struct drm_vram_mm *vmm = dev->vram_mm;
192 struct ttm_device *bdev;
193 int ret;
194
195 if (WARN_ONCE(!vmm, "VRAM MM not initialized"))
196 return ERR_PTR(-EINVAL);
197
198 if (dev->driver->gem_create_object) {
199 gem = dev->driver->gem_create_object(dev, size);
200 if (!gem)
201 return ERR_PTR(-ENOMEM);
202 gbo = drm_gem_vram_of_gem(gem);
203 } else {
204 gbo = kzalloc(sizeof(*gbo), GFP_KERNEL);
205 if (!gbo)
206 return ERR_PTR(-ENOMEM);
207 gem = &gbo->bo.base;
208 }
209
210 if (!gem->funcs)
211 gem->funcs = &drm_gem_vram_object_funcs;
212
213 ret = drm_gem_object_init(dev, gem, size);
214 if (ret) {
215 kfree(gbo);
216 return ERR_PTR(ret);
217 }
218
219 bdev = &vmm->bdev;
220
221 gbo->bo.bdev = bdev;
222 drm_gem_vram_placement(gbo, DRM_GEM_VRAM_PL_FLAG_SYSTEM);
223
224
225
226
227
228 ret = ttm_bo_init(bdev, &gbo->bo, size, ttm_bo_type_device,
229 &gbo->placement, pg_align, false, NULL, NULL,
230 ttm_buffer_object_destroy);
231 if (ret)
232 return ERR_PTR(ret);
233
234 return gbo;
235}
236EXPORT_SYMBOL(drm_gem_vram_create);
237
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241
242
243
244void drm_gem_vram_put(struct drm_gem_vram_object *gbo)
245{
246 ttm_bo_put(&gbo->bo);
247}
248EXPORT_SYMBOL(drm_gem_vram_put);
249
250static u64 drm_gem_vram_pg_offset(struct drm_gem_vram_object *gbo)
251{
252
253 if (WARN_ON_ONCE(!gbo->bo.resource ||
254 gbo->bo.resource->mem_type == TTM_PL_SYSTEM))
255 return 0;
256
257 return gbo->bo.resource->start;
258}
259
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271
272s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo)
273{
274 if (WARN_ON_ONCE(!gbo->bo.pin_count))
275 return (s64)-ENODEV;
276 return drm_gem_vram_pg_offset(gbo) << PAGE_SHIFT;
277}
278EXPORT_SYMBOL(drm_gem_vram_offset);
279
280static int drm_gem_vram_pin_locked(struct drm_gem_vram_object *gbo,
281 unsigned long pl_flag)
282{
283 struct ttm_operation_ctx ctx = { false, false };
284 int ret;
285
286 if (gbo->bo.pin_count)
287 goto out;
288
289 if (pl_flag)
290 drm_gem_vram_placement(gbo, pl_flag);
291
292 ret = ttm_bo_validate(&gbo->bo, &gbo->placement, &ctx);
293 if (ret < 0)
294 return ret;
295
296out:
297 ttm_bo_pin(&gbo->bo);
298
299 return 0;
300}
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324
325int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag)
326{
327 int ret;
328
329 ret = ttm_bo_reserve(&gbo->bo, true, false, NULL);
330 if (ret)
331 return ret;
332 ret = drm_gem_vram_pin_locked(gbo, pl_flag);
333 ttm_bo_unreserve(&gbo->bo);
334
335 return ret;
336}
337EXPORT_SYMBOL(drm_gem_vram_pin);
338
339static void drm_gem_vram_unpin_locked(struct drm_gem_vram_object *gbo)
340{
341 ttm_bo_unpin(&gbo->bo);
342}
343
344
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349
350
351
352int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo)
353{
354 int ret;
355
356 ret = ttm_bo_reserve(&gbo->bo, true, false, NULL);
357 if (ret)
358 return ret;
359
360 drm_gem_vram_unpin_locked(gbo);
361 ttm_bo_unreserve(&gbo->bo);
362
363 return 0;
364}
365EXPORT_SYMBOL(drm_gem_vram_unpin);
366
367static int drm_gem_vram_kmap_locked(struct drm_gem_vram_object *gbo,
368 struct dma_buf_map *map)
369{
370 int ret;
371
372 if (gbo->vmap_use_count > 0)
373 goto out;
374
375
376
377
378
379
380 if (dma_buf_map_is_null(&gbo->map)) {
381 ret = ttm_bo_vmap(&gbo->bo, &gbo->map);
382 if (ret)
383 return ret;
384 }
385
386out:
387 ++gbo->vmap_use_count;
388 *map = gbo->map;
389
390 return 0;
391}
392
393static void drm_gem_vram_kunmap_locked(struct drm_gem_vram_object *gbo,
394 struct dma_buf_map *map)
395{
396 struct drm_device *dev = gbo->bo.base.dev;
397
398 if (drm_WARN_ON_ONCE(dev, !gbo->vmap_use_count))
399 return;
400
401 if (drm_WARN_ON_ONCE(dev, !dma_buf_map_is_equal(&gbo->map, map)))
402 return;
403
404 if (--gbo->vmap_use_count > 0)
405 return;
406
407
408
409
410
411
412
413}
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430
431int drm_gem_vram_vmap(struct drm_gem_vram_object *gbo, struct dma_buf_map *map)
432{
433 int ret;
434
435 ret = ttm_bo_reserve(&gbo->bo, true, false, NULL);
436 if (ret)
437 return ret;
438
439 ret = drm_gem_vram_pin_locked(gbo, 0);
440 if (ret)
441 goto err_ttm_bo_unreserve;
442 ret = drm_gem_vram_kmap_locked(gbo, map);
443 if (ret)
444 goto err_drm_gem_vram_unpin_locked;
445
446 ttm_bo_unreserve(&gbo->bo);
447
448 return 0;
449
450err_drm_gem_vram_unpin_locked:
451 drm_gem_vram_unpin_locked(gbo);
452err_ttm_bo_unreserve:
453 ttm_bo_unreserve(&gbo->bo);
454 return ret;
455}
456EXPORT_SYMBOL(drm_gem_vram_vmap);
457
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459
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462
463
464
465
466void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, struct dma_buf_map *map)
467{
468 int ret;
469
470 ret = ttm_bo_reserve(&gbo->bo, false, false, NULL);
471 if (WARN_ONCE(ret, "ttm_bo_reserve_failed(): ret=%d\n", ret))
472 return;
473
474 drm_gem_vram_kunmap_locked(gbo, map);
475 drm_gem_vram_unpin_locked(gbo);
476
477 ttm_bo_unreserve(&gbo->bo);
478}
479EXPORT_SYMBOL(drm_gem_vram_vunmap);
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499
500int drm_gem_vram_fill_create_dumb(struct drm_file *file,
501 struct drm_device *dev,
502 unsigned long pg_align,
503 unsigned long pitch_align,
504 struct drm_mode_create_dumb *args)
505{
506 size_t pitch, size;
507 struct drm_gem_vram_object *gbo;
508 int ret;
509 u32 handle;
510
511 pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
512 if (pitch_align) {
513 if (WARN_ON_ONCE(!is_power_of_2(pitch_align)))
514 return -EINVAL;
515 pitch = ALIGN(pitch, pitch_align);
516 }
517 size = pitch * args->height;
518
519 size = roundup(size, PAGE_SIZE);
520 if (!size)
521 return -EINVAL;
522
523 gbo = drm_gem_vram_create(dev, size, pg_align);
524 if (IS_ERR(gbo))
525 return PTR_ERR(gbo);
526
527 ret = drm_gem_handle_create(file, &gbo->bo.base, &handle);
528 if (ret)
529 goto err_drm_gem_object_put;
530
531 drm_gem_object_put(&gbo->bo.base);
532
533 args->pitch = pitch;
534 args->size = size;
535 args->handle = handle;
536
537 return 0;
538
539err_drm_gem_object_put:
540 drm_gem_object_put(&gbo->bo.base);
541 return ret;
542}
543EXPORT_SYMBOL(drm_gem_vram_fill_create_dumb);
544
545
546
547
548
549static bool drm_is_gem_vram(struct ttm_buffer_object *bo)
550{
551 return (bo->destroy == ttm_buffer_object_destroy);
552}
553
554static void drm_gem_vram_bo_driver_evict_flags(struct drm_gem_vram_object *gbo,
555 struct ttm_placement *pl)
556{
557 drm_gem_vram_placement(gbo, DRM_GEM_VRAM_PL_FLAG_SYSTEM);
558 *pl = gbo->placement;
559}
560
561static void drm_gem_vram_bo_driver_move_notify(struct drm_gem_vram_object *gbo)
562{
563 struct ttm_buffer_object *bo = &gbo->bo;
564 struct drm_device *dev = bo->base.dev;
565
566 if (drm_WARN_ON_ONCE(dev, gbo->vmap_use_count))
567 return;
568
569 ttm_bo_vunmap(bo, &gbo->map);
570 dma_buf_map_clear(&gbo->map);
571}
572
573static int drm_gem_vram_bo_driver_move(struct drm_gem_vram_object *gbo,
574 bool evict,
575 struct ttm_operation_ctx *ctx,
576 struct ttm_resource *new_mem)
577{
578 drm_gem_vram_bo_driver_move_notify(gbo);
579 return ttm_bo_move_memcpy(&gbo->bo, ctx, new_mem);
580}
581
582
583
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589
590
591static void drm_gem_vram_object_free(struct drm_gem_object *gem)
592{
593 struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
594
595 drm_gem_vram_put(gbo);
596}
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617int drm_gem_vram_driver_dumb_create(struct drm_file *file,
618 struct drm_device *dev,
619 struct drm_mode_create_dumb *args)
620{
621 if (WARN_ONCE(!dev->vram_mm, "VRAM MM not initialized"))
622 return -EINVAL;
623
624 return drm_gem_vram_fill_create_dumb(file, dev, 0, 0, args);
625}
626EXPORT_SYMBOL(drm_gem_vram_driver_dumb_create);
627
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629
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645
646int
647drm_gem_vram_plane_helper_prepare_fb(struct drm_plane *plane,
648 struct drm_plane_state *new_state)
649{
650 size_t i;
651 struct drm_gem_vram_object *gbo;
652 int ret;
653
654 if (!new_state->fb)
655 return 0;
656
657 for (i = 0; i < ARRAY_SIZE(new_state->fb->obj); ++i) {
658 if (!new_state->fb->obj[i])
659 continue;
660 gbo = drm_gem_vram_of_gem(new_state->fb->obj[i]);
661 ret = drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM);
662 if (ret)
663 goto err_drm_gem_vram_unpin;
664 }
665
666 ret = drm_gem_plane_helper_prepare_fb(plane, new_state);
667 if (ret)
668 goto err_drm_gem_vram_unpin;
669
670 return 0;
671
672err_drm_gem_vram_unpin:
673 while (i) {
674 --i;
675 gbo = drm_gem_vram_of_gem(new_state->fb->obj[i]);
676 drm_gem_vram_unpin(gbo);
677 }
678 return ret;
679}
680EXPORT_SYMBOL(drm_gem_vram_plane_helper_prepare_fb);
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691
692void
693drm_gem_vram_plane_helper_cleanup_fb(struct drm_plane *plane,
694 struct drm_plane_state *old_state)
695{
696 size_t i;
697 struct drm_gem_vram_object *gbo;
698
699 if (!old_state->fb)
700 return;
701
702 for (i = 0; i < ARRAY_SIZE(old_state->fb->obj); ++i) {
703 if (!old_state->fb->obj[i])
704 continue;
705 gbo = drm_gem_vram_of_gem(old_state->fb->obj[i]);
706 drm_gem_vram_unpin(gbo);
707 }
708}
709EXPORT_SYMBOL(drm_gem_vram_plane_helper_cleanup_fb);
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729int drm_gem_vram_simple_display_pipe_prepare_fb(
730 struct drm_simple_display_pipe *pipe,
731 struct drm_plane_state *new_state)
732{
733 return drm_gem_vram_plane_helper_prepare_fb(&pipe->plane, new_state);
734}
735EXPORT_SYMBOL(drm_gem_vram_simple_display_pipe_prepare_fb);
736
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742
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746
747void drm_gem_vram_simple_display_pipe_cleanup_fb(
748 struct drm_simple_display_pipe *pipe,
749 struct drm_plane_state *old_state)
750{
751 drm_gem_vram_plane_helper_cleanup_fb(&pipe->plane, old_state);
752}
753EXPORT_SYMBOL(drm_gem_vram_simple_display_pipe_cleanup_fb);
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767
768static int drm_gem_vram_object_pin(struct drm_gem_object *gem)
769{
770 struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
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772
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777
778
779
780 return drm_gem_vram_pin(gbo, 0);
781}
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786
787
788static void drm_gem_vram_object_unpin(struct drm_gem_object *gem)
789{
790 struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
791
792 drm_gem_vram_unpin(gbo);
793}
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804
805static int drm_gem_vram_object_vmap(struct drm_gem_object *gem, struct dma_buf_map *map)
806{
807 struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
808
809 return drm_gem_vram_vmap(gbo, map);
810}
811
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813
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815
816
817
818static void drm_gem_vram_object_vunmap(struct drm_gem_object *gem, struct dma_buf_map *map)
819{
820 struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
821
822 drm_gem_vram_vunmap(gbo, map);
823}
824
825
826
827
828
829static const struct drm_gem_object_funcs drm_gem_vram_object_funcs = {
830 .free = drm_gem_vram_object_free,
831 .pin = drm_gem_vram_object_pin,
832 .unpin = drm_gem_vram_object_unpin,
833 .vmap = drm_gem_vram_object_vmap,
834 .vunmap = drm_gem_vram_object_vunmap,
835 .mmap = drm_gem_ttm_mmap,
836 .print_info = drm_gem_ttm_print_info,
837};
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844
845
846
847static void bo_driver_ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *tt)
848{
849 ttm_tt_destroy_common(bdev, tt);
850 ttm_tt_fini(tt);
851 kfree(tt);
852}
853
854
855
856
857
858static struct ttm_tt *bo_driver_ttm_tt_create(struct ttm_buffer_object *bo,
859 uint32_t page_flags)
860{
861 struct ttm_tt *tt;
862 int ret;
863
864 tt = kzalloc(sizeof(*tt), GFP_KERNEL);
865 if (!tt)
866 return NULL;
867
868 ret = ttm_tt_init(tt, bo, page_flags, ttm_cached);
869 if (ret < 0)
870 goto err_ttm_tt_init;
871
872 return tt;
873
874err_ttm_tt_init:
875 kfree(tt);
876 return NULL;
877}
878
879static void bo_driver_evict_flags(struct ttm_buffer_object *bo,
880 struct ttm_placement *placement)
881{
882 struct drm_gem_vram_object *gbo;
883
884
885 if (!drm_is_gem_vram(bo))
886 return;
887
888 gbo = drm_gem_vram_of_bo(bo);
889
890 drm_gem_vram_bo_driver_evict_flags(gbo, placement);
891}
892
893static void bo_driver_delete_mem_notify(struct ttm_buffer_object *bo)
894{
895 struct drm_gem_vram_object *gbo;
896
897
898 if (!drm_is_gem_vram(bo))
899 return;
900
901 gbo = drm_gem_vram_of_bo(bo);
902
903 drm_gem_vram_bo_driver_move_notify(gbo);
904}
905
906static int bo_driver_move(struct ttm_buffer_object *bo,
907 bool evict,
908 struct ttm_operation_ctx *ctx,
909 struct ttm_resource *new_mem,
910 struct ttm_place *hop)
911{
912 struct drm_gem_vram_object *gbo;
913
914 gbo = drm_gem_vram_of_bo(bo);
915
916 return drm_gem_vram_bo_driver_move(gbo, evict, ctx, new_mem);
917}
918
919static int bo_driver_io_mem_reserve(struct ttm_device *bdev,
920 struct ttm_resource *mem)
921{
922 struct drm_vram_mm *vmm = drm_vram_mm_of_bdev(bdev);
923
924 switch (mem->mem_type) {
925 case TTM_PL_SYSTEM:
926 break;
927 case TTM_PL_VRAM:
928 mem->bus.offset = (mem->start << PAGE_SHIFT) + vmm->vram_base;
929 mem->bus.is_iomem = true;
930 mem->bus.caching = ttm_write_combined;
931 break;
932 default:
933 return -EINVAL;
934 }
935
936 return 0;
937}
938
939static struct ttm_device_funcs bo_driver = {
940 .ttm_tt_create = bo_driver_ttm_tt_create,
941 .ttm_tt_destroy = bo_driver_ttm_tt_destroy,
942 .eviction_valuable = ttm_bo_eviction_valuable,
943 .evict_flags = bo_driver_evict_flags,
944 .move = bo_driver_move,
945 .delete_mem_notify = bo_driver_delete_mem_notify,
946 .io_mem_reserve = bo_driver_io_mem_reserve,
947};
948
949
950
951
952
953static int drm_vram_mm_debugfs(struct seq_file *m, void *data)
954{
955 struct drm_info_node *node = (struct drm_info_node *) m->private;
956 struct drm_vram_mm *vmm = node->minor->dev->vram_mm;
957 struct ttm_resource_manager *man = ttm_manager_type(&vmm->bdev, TTM_PL_VRAM);
958 struct drm_printer p = drm_seq_file_printer(m);
959
960 ttm_resource_manager_debug(man, &p);
961 return 0;
962}
963
964static const struct drm_info_list drm_vram_mm_debugfs_list[] = {
965 { "vram-mm", drm_vram_mm_debugfs, 0, NULL },
966};
967
968
969
970
971
972
973
974void drm_vram_mm_debugfs_init(struct drm_minor *minor)
975{
976 drm_debugfs_create_files(drm_vram_mm_debugfs_list,
977 ARRAY_SIZE(drm_vram_mm_debugfs_list),
978 minor->debugfs_root, minor);
979}
980EXPORT_SYMBOL(drm_vram_mm_debugfs_init);
981
982static int drm_vram_mm_init(struct drm_vram_mm *vmm, struct drm_device *dev,
983 uint64_t vram_base, size_t vram_size)
984{
985 int ret;
986
987 vmm->vram_base = vram_base;
988 vmm->vram_size = vram_size;
989
990 ret = ttm_device_init(&vmm->bdev, &bo_driver, dev->dev,
991 dev->anon_inode->i_mapping,
992 dev->vma_offset_manager,
993 false, true);
994 if (ret)
995 return ret;
996
997 ret = ttm_range_man_init(&vmm->bdev, TTM_PL_VRAM,
998 false, vram_size >> PAGE_SHIFT);
999 if (ret)
1000 return ret;
1001
1002 return 0;
1003}
1004
1005static void drm_vram_mm_cleanup(struct drm_vram_mm *vmm)
1006{
1007 ttm_range_man_fini(&vmm->bdev, TTM_PL_VRAM);
1008 ttm_device_fini(&vmm->bdev);
1009}
1010
1011
1012
1013
1014
1015static struct drm_vram_mm *drm_vram_helper_alloc_mm(struct drm_device *dev, uint64_t vram_base,
1016 size_t vram_size)
1017{
1018 int ret;
1019
1020 if (WARN_ON(dev->vram_mm))
1021 return dev->vram_mm;
1022
1023 dev->vram_mm = kzalloc(sizeof(*dev->vram_mm), GFP_KERNEL);
1024 if (!dev->vram_mm)
1025 return ERR_PTR(-ENOMEM);
1026
1027 ret = drm_vram_mm_init(dev->vram_mm, dev, vram_base, vram_size);
1028 if (ret)
1029 goto err_kfree;
1030
1031 return dev->vram_mm;
1032
1033err_kfree:
1034 kfree(dev->vram_mm);
1035 dev->vram_mm = NULL;
1036 return ERR_PTR(ret);
1037}
1038
1039static void drm_vram_helper_release_mm(struct drm_device *dev)
1040{
1041 if (!dev->vram_mm)
1042 return;
1043
1044 drm_vram_mm_cleanup(dev->vram_mm);
1045 kfree(dev->vram_mm);
1046 dev->vram_mm = NULL;
1047}
1048
1049static void drm_vram_mm_release(struct drm_device *dev, void *ptr)
1050{
1051 drm_vram_helper_release_mm(dev);
1052}
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069int drmm_vram_helper_init(struct drm_device *dev, uint64_t vram_base,
1070 size_t vram_size)
1071{
1072 struct drm_vram_mm *vram_mm;
1073
1074 if (drm_WARN_ON_ONCE(dev, dev->vram_mm))
1075 return 0;
1076
1077 vram_mm = drm_vram_helper_alloc_mm(dev, vram_base, vram_size);
1078 if (IS_ERR(vram_mm))
1079 return PTR_ERR(vram_mm);
1080 return drmm_add_action_or_reset(dev, drm_vram_mm_release, NULL);
1081}
1082EXPORT_SYMBOL(drmm_vram_helper_init);
1083
1084
1085
1086
1087
1088static enum drm_mode_status
1089drm_vram_helper_mode_valid_internal(struct drm_device *dev,
1090 const struct drm_display_mode *mode,
1091 unsigned long max_bpp)
1092{
1093 struct drm_vram_mm *vmm = dev->vram_mm;
1094 unsigned long fbsize, fbpages, max_fbpages;
1095
1096 if (WARN_ON(!dev->vram_mm))
1097 return MODE_BAD;
1098
1099 max_fbpages = (vmm->vram_size / 2) >> PAGE_SHIFT;
1100
1101 fbsize = mode->hdisplay * mode->vdisplay * max_bpp;
1102 fbpages = DIV_ROUND_UP(fbsize, PAGE_SIZE);
1103
1104 if (fbpages > max_fbpages)
1105 return MODE_MEM;
1106
1107 return MODE_OK;
1108}
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135enum drm_mode_status
1136drm_vram_helper_mode_valid(struct drm_device *dev,
1137 const struct drm_display_mode *mode)
1138{
1139 static const unsigned long max_bpp = 4;
1140
1141 return drm_vram_helper_mode_valid_internal(dev, mode, max_bpp);
1142}
1143EXPORT_SYMBOL(drm_vram_helper_mode_valid);
1144
1145MODULE_DESCRIPTION("DRM VRAM memory-management helpers");
1146MODULE_LICENSE("GPL");
1147