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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * NVIDIA Tegra DRM GEM helper functions
4 *
5 * Copyright (C) 2012 Sascha Hauer, Pengutronix
6 * Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved.
7 *
8 * Based on the GEM/CMA helpers
9 *
10 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
11 */
12
13#include <linux/dma-buf.h>
14#include <linux/iommu.h>
15#include <linux/module.h>
16#include <linux/vmalloc.h>
17
18#include <drm/drm_drv.h>
19#include <drm/drm_prime.h>
20#include <drm/tegra_drm.h>
21
22#include "drm.h"
23#include "gem.h"
24
25MODULE_IMPORT_NS("DMA_BUF");
26
27static unsigned int sg_dma_count_chunks(struct scatterlist *sgl, unsigned int nents)
28{
29 dma_addr_t next = ~(dma_addr_t)0;
30 unsigned int count = 0, i;
31 struct scatterlist *s;
32
33 for_each_sg(sgl, s, nents, i) {
34 /* sg_dma_address(s) is only valid for entries that have sg_dma_len(s) != 0. */
35 if (!sg_dma_len(s))
36 continue;
37
38 if (sg_dma_address(s) != next) {
39 next = sg_dma_address(s) + sg_dma_len(s);
40 count++;
41 }
42 }
43
44 return count;
45}
46
47static inline unsigned int sgt_dma_count_chunks(struct sg_table *sgt)
48{
49 return sg_dma_count_chunks(sgt->sgl, sgt->nents);
50}
51
52static void tegra_bo_put(struct host1x_bo *bo)
53{
54 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
55
56 drm_gem_object_put(&obj->gem);
57}
58
59static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
60 enum dma_data_direction direction)
61{
62 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
63 struct drm_gem_object *gem = &obj->gem;
64 struct host1x_bo_mapping *map;
65 int err;
66
67 map = kzalloc(sizeof(*map), GFP_KERNEL);
68 if (!map)
69 return ERR_PTR(-ENOMEM);
70
71 kref_init(&map->ref);
72 map->bo = host1x_bo_get(bo);
73 map->direction = direction;
74 map->dev = dev;
75
76 /*
77 * Imported buffers need special treatment to satisfy the semantics of DMA-BUF.
78 */
79 if (obj->dma_buf) {
80 struct dma_buf *buf = obj->dma_buf;
81
82 map->attach = dma_buf_attach(buf, dev);
83 if (IS_ERR(map->attach)) {
84 err = PTR_ERR(map->attach);
85 goto free;
86 }
87
88 map->sgt = dma_buf_map_attachment_unlocked(map->attach, direction);
89 if (IS_ERR(map->sgt)) {
90 dma_buf_detach(buf, map->attach);
91 err = PTR_ERR(map->sgt);
92 map->sgt = NULL;
93 goto free;
94 }
95
96 err = sgt_dma_count_chunks(map->sgt);
97 map->size = gem->size;
98
99 goto out;
100 }
101
102 /*
103 * If we don't have a mapping for this buffer yet, return an SG table
104 * so that host1x can do the mapping for us via the DMA API.
105 */
106 map->sgt = kzalloc(sizeof(*map->sgt), GFP_KERNEL);
107 if (!map->sgt) {
108 err = -ENOMEM;
109 goto free;
110 }
111
112 if (obj->pages) {
113 /*
114 * If the buffer object was allocated from the explicit IOMMU
115 * API code paths, construct an SG table from the pages.
116 */
117 err = sg_alloc_table_from_pages(map->sgt, obj->pages, obj->num_pages, 0, gem->size,
118 GFP_KERNEL);
119 if (err < 0)
120 goto free;
121 } else {
122 /*
123 * If the buffer object had no pages allocated and if it was
124 * not imported, it had to be allocated with the DMA API, so
125 * the DMA API helper can be used.
126 */
127 err = dma_get_sgtable(dev, map->sgt, obj->vaddr, obj->iova, gem->size);
128 if (err < 0)
129 goto free;
130 }
131
132 err = dma_map_sgtable(dev, map->sgt, direction, 0);
133 if (err)
134 goto free_sgt;
135
136out:
137 /*
138 * If we've manually mapped the buffer object through the IOMMU, make sure to return the
139 * existing IOVA address of our mapping.
140 */
141 if (!obj->mm) {
142 map->phys = sg_dma_address(map->sgt->sgl);
143 map->chunks = err;
144 } else {
145 map->phys = obj->iova;
146 map->chunks = 1;
147 }
148
149 map->size = gem->size;
150
151 return map;
152
153free_sgt:
154 sg_free_table(map->sgt);
155free:
156 kfree(map->sgt);
157 kfree(map);
158 return ERR_PTR(err);
159}
160
161static void tegra_bo_unpin(struct host1x_bo_mapping *map)
162{
163 if (map->attach) {
164 dma_buf_unmap_attachment_unlocked(map->attach, map->sgt,
165 map->direction);
166 dma_buf_detach(map->attach->dmabuf, map->attach);
167 } else {
168 dma_unmap_sgtable(map->dev, map->sgt, map->direction, 0);
169 sg_free_table(map->sgt);
170 kfree(map->sgt);
171 }
172
173 host1x_bo_put(map->bo);
174 kfree(map);
175}
176
177static void *tegra_bo_mmap(struct host1x_bo *bo)
178{
179 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
180 struct iosys_map map = { 0 };
181 void *vaddr;
182 int ret;
183
184 if (obj->vaddr)
185 return obj->vaddr;
186
187 if (obj->dma_buf) {
188 ret = dma_buf_vmap_unlocked(obj->dma_buf, &map);
189 if (ret < 0)
190 return ERR_PTR(ret);
191
192 return map.vaddr;
193 }
194
195 vaddr = vmap(obj->pages, obj->num_pages, VM_MAP,
196 pgprot_writecombine(PAGE_KERNEL));
197 if (!vaddr)
198 return ERR_PTR(-ENOMEM);
199
200 return vaddr;
201}
202
203static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
204{
205 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
206 struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr);
207
208 if (obj->vaddr)
209 return;
210
211 if (obj->dma_buf)
212 return dma_buf_vunmap_unlocked(obj->dma_buf, &map);
213
214 vunmap(addr);
215}
216
217static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
218{
219 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
220
221 drm_gem_object_get(&obj->gem);
222
223 return bo;
224}
225
226static const struct host1x_bo_ops tegra_bo_ops = {
227 .get = tegra_bo_get,
228 .put = tegra_bo_put,
229 .pin = tegra_bo_pin,
230 .unpin = tegra_bo_unpin,
231 .mmap = tegra_bo_mmap,
232 .munmap = tegra_bo_munmap,
233};
234
235static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
236{
237 int prot = IOMMU_READ | IOMMU_WRITE;
238 int err;
239
240 if (bo->mm)
241 return -EBUSY;
242
243 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
244 if (!bo->mm)
245 return -ENOMEM;
246
247 mutex_lock(&tegra->mm_lock);
248
249 err = drm_mm_insert_node_generic(&tegra->mm,
250 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
251 if (err < 0) {
252 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
253 err);
254 goto unlock;
255 }
256
257 bo->iova = bo->mm->start;
258
259 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
260 if (!bo->size) {
261 dev_err(tegra->drm->dev, "failed to map buffer\n");
262 err = -ENOMEM;
263 goto remove;
264 }
265
266 mutex_unlock(&tegra->mm_lock);
267
268 return 0;
269
270remove:
271 drm_mm_remove_node(bo->mm);
272unlock:
273 mutex_unlock(&tegra->mm_lock);
274 kfree(bo->mm);
275 return err;
276}
277
278static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
279{
280 if (!bo->mm)
281 return 0;
282
283 mutex_lock(&tegra->mm_lock);
284 iommu_unmap(tegra->domain, bo->iova, bo->size);
285 drm_mm_remove_node(bo->mm);
286 mutex_unlock(&tegra->mm_lock);
287
288 kfree(bo->mm);
289
290 return 0;
291}
292
293static const struct drm_gem_object_funcs tegra_gem_object_funcs = {
294 .free = tegra_bo_free_object,
295 .export = tegra_gem_prime_export,
296 .vm_ops = &tegra_bo_vm_ops,
297};
298
299static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
300 size_t size)
301{
302 struct tegra_bo *bo;
303 int err;
304
305 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
306 if (!bo)
307 return ERR_PTR(-ENOMEM);
308
309 bo->gem.funcs = &tegra_gem_object_funcs;
310
311 host1x_bo_init(&bo->base, &tegra_bo_ops);
312 size = round_up(size, PAGE_SIZE);
313
314 err = drm_gem_object_init(drm, &bo->gem, size);
315 if (err < 0)
316 goto free;
317
318 err = drm_gem_create_mmap_offset(&bo->gem);
319 if (err < 0)
320 goto release;
321
322 return bo;
323
324release:
325 drm_gem_object_release(&bo->gem);
326free:
327 kfree(bo);
328 return ERR_PTR(err);
329}
330
331static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
332{
333 if (bo->pages) {
334 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
335 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
336 sg_free_table(bo->sgt);
337 kfree(bo->sgt);
338 } else if (bo->vaddr) {
339 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
340 }
341}
342
343static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
344{
345 int err;
346
347 bo->pages = drm_gem_get_pages(&bo->gem);
348 if (IS_ERR(bo->pages))
349 return PTR_ERR(bo->pages);
350
351 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
352
353 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages);
354 if (IS_ERR(bo->sgt)) {
355 err = PTR_ERR(bo->sgt);
356 goto put_pages;
357 }
358
359 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
360 if (err)
361 goto free_sgt;
362
363 return 0;
364
365free_sgt:
366 sg_free_table(bo->sgt);
367 kfree(bo->sgt);
368put_pages:
369 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
370 return err;
371}
372
373static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
374{
375 struct tegra_drm *tegra = drm->dev_private;
376 int err;
377
378 if (tegra->domain) {
379 err = tegra_bo_get_pages(drm, bo);
380 if (err < 0)
381 return err;
382
383 err = tegra_bo_iommu_map(tegra, bo);
384 if (err < 0) {
385 tegra_bo_free(drm, bo);
386 return err;
387 }
388 } else {
389 size_t size = bo->gem.size;
390
391 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
392 GFP_KERNEL | __GFP_NOWARN);
393 if (!bo->vaddr) {
394 dev_err(drm->dev,
395 "failed to allocate buffer of size %zu\n",
396 size);
397 return -ENOMEM;
398 }
399 }
400
401 return 0;
402}
403
404struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
405 unsigned long flags)
406{
407 struct tegra_bo *bo;
408 int err;
409
410 bo = tegra_bo_alloc_object(drm, size);
411 if (IS_ERR(bo))
412 return bo;
413
414 err = tegra_bo_alloc(drm, bo);
415 if (err < 0)
416 goto release;
417
418 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
419 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
420
421 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
422 bo->flags |= TEGRA_BO_BOTTOM_UP;
423
424 return bo;
425
426release:
427 drm_gem_object_release(&bo->gem);
428 kfree(bo);
429 return ERR_PTR(err);
430}
431
432struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
433 struct drm_device *drm,
434 size_t size,
435 unsigned long flags,
436 u32 *handle)
437{
438 struct tegra_bo *bo;
439 int err;
440
441 bo = tegra_bo_create(drm, size, flags);
442 if (IS_ERR(bo))
443 return bo;
444
445 err = drm_gem_handle_create(file, &bo->gem, handle);
446 if (err) {
447 tegra_bo_free_object(&bo->gem);
448 return ERR_PTR(err);
449 }
450
451 drm_gem_object_put(&bo->gem);
452
453 return bo;
454}
455
456static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
457 struct dma_buf *buf)
458{
459 struct tegra_drm *tegra = drm->dev_private;
460 struct dma_buf_attachment *attach;
461 struct tegra_bo *bo;
462 int err;
463
464 bo = tegra_bo_alloc_object(drm, buf->size);
465 if (IS_ERR(bo))
466 return bo;
467
468 /*
469 * If we need to use IOMMU API to map the dma-buf into the internally managed
470 * domain, map it first to the DRM device to get an sgt.
471 */
472 if (tegra->domain) {
473 attach = dma_buf_attach(buf, drm->dev);
474 if (IS_ERR(attach)) {
475 err = PTR_ERR(attach);
476 goto free;
477 }
478
479 bo->sgt = dma_buf_map_attachment_unlocked(attach, DMA_TO_DEVICE);
480 if (IS_ERR(bo->sgt)) {
481 err = PTR_ERR(bo->sgt);
482 goto detach;
483 }
484
485 err = tegra_bo_iommu_map(tegra, bo);
486 if (err < 0)
487 goto detach;
488
489 bo->gem.import_attach = attach;
490 }
491
492 get_dma_buf(buf);
493 bo->dma_buf = buf;
494
495 return bo;
496
497detach:
498 if (!IS_ERR_OR_NULL(bo->sgt))
499 dma_buf_unmap_attachment_unlocked(attach, bo->sgt, DMA_TO_DEVICE);
500
501 dma_buf_detach(buf, attach);
502 dma_buf_put(buf);
503free:
504 drm_gem_object_release(&bo->gem);
505 kfree(bo);
506 return ERR_PTR(err);
507}
508
509void tegra_bo_free_object(struct drm_gem_object *gem)
510{
511 struct tegra_drm *tegra = gem->dev->dev_private;
512 struct host1x_bo_mapping *mapping, *tmp;
513 struct tegra_bo *bo = to_tegra_bo(gem);
514
515 /* remove all mappings of this buffer object from any caches */
516 list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) {
517 if (mapping->cache)
518 host1x_bo_unpin(mapping);
519 else
520 dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping,
521 dev_name(mapping->dev));
522 }
523
524 if (tegra->domain) {
525 tegra_bo_iommu_unmap(tegra, bo);
526
527 if (gem->import_attach) {
528 dma_buf_unmap_attachment_unlocked(gem->import_attach, bo->sgt,
529 DMA_TO_DEVICE);
530 dma_buf_detach(gem->import_attach->dmabuf, gem->import_attach);
531 }
532 }
533
534 tegra_bo_free(gem->dev, bo);
535
536 if (bo->dma_buf)
537 dma_buf_put(bo->dma_buf);
538
539 drm_gem_object_release(gem);
540 kfree(bo);
541}
542
543int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
544 struct drm_mode_create_dumb *args)
545{
546 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
547 struct tegra_drm *tegra = drm->dev_private;
548 struct tegra_bo *bo;
549
550 args->pitch = round_up(min_pitch, tegra->pitch_align);
551 args->size = args->pitch * args->height;
552
553 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
554 &args->handle);
555 if (IS_ERR(bo))
556 return PTR_ERR(bo);
557
558 return 0;
559}
560
561static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
562{
563 struct vm_area_struct *vma = vmf->vma;
564 struct drm_gem_object *gem = vma->vm_private_data;
565 struct tegra_bo *bo = to_tegra_bo(gem);
566 struct page *page;
567 pgoff_t offset;
568
569 if (!bo->pages)
570 return VM_FAULT_SIGBUS;
571
572 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
573 page = bo->pages[offset];
574
575 return vmf_insert_page(vma, vmf->address, page);
576}
577
578const struct vm_operations_struct tegra_bo_vm_ops = {
579 .fault = tegra_bo_fault,
580 .open = drm_gem_vm_open,
581 .close = drm_gem_vm_close,
582};
583
584int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
585{
586 struct tegra_bo *bo = to_tegra_bo(gem);
587
588 if (!bo->pages) {
589 unsigned long vm_pgoff = vma->vm_pgoff;
590 int err;
591
592 /*
593 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
594 * and set the vm_pgoff (used as a fake buffer offset by DRM)
595 * to 0 as we want to map the whole buffer.
596 */
597 vm_flags_clear(vma, VM_PFNMAP);
598 vma->vm_pgoff = 0;
599
600 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
601 gem->size);
602 if (err < 0) {
603 drm_gem_vm_close(vma);
604 return err;
605 }
606
607 vma->vm_pgoff = vm_pgoff;
608 } else {
609 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
610
611 vm_flags_mod(vma, VM_MIXEDMAP, VM_PFNMAP);
612
613 vma->vm_page_prot = pgprot_writecombine(prot);
614 }
615
616 return 0;
617}
618
619int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
620{
621 struct drm_gem_object *gem;
622 int err;
623
624 err = drm_gem_mmap(file, vma);
625 if (err < 0)
626 return err;
627
628 gem = vma->vm_private_data;
629
630 return __tegra_gem_mmap(gem, vma);
631}
632
633static struct sg_table *
634tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
635 enum dma_data_direction dir)
636{
637 struct drm_gem_object *gem = attach->dmabuf->priv;
638 struct tegra_bo *bo = to_tegra_bo(gem);
639 struct sg_table *sgt;
640
641 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
642 if (!sgt)
643 return NULL;
644
645 if (bo->pages) {
646 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
647 0, gem->size, GFP_KERNEL) < 0)
648 goto free;
649 } else {
650 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
651 gem->size) < 0)
652 goto free;
653 }
654
655 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
656 goto free;
657
658 return sgt;
659
660free:
661 sg_free_table(sgt);
662 kfree(sgt);
663 return NULL;
664}
665
666static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
667 struct sg_table *sgt,
668 enum dma_data_direction dir)
669{
670 struct drm_gem_object *gem = attach->dmabuf->priv;
671 struct tegra_bo *bo = to_tegra_bo(gem);
672
673 if (bo->pages)
674 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
675
676 sg_free_table(sgt);
677 kfree(sgt);
678}
679
680static void tegra_gem_prime_release(struct dma_buf *buf)
681{
682 drm_gem_dmabuf_release(buf);
683}
684
685static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
686 enum dma_data_direction direction)
687{
688 struct drm_gem_object *gem = buf->priv;
689 struct tegra_bo *bo = to_tegra_bo(gem);
690 struct drm_device *drm = gem->dev;
691
692 if (bo->pages)
693 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
694
695 return 0;
696}
697
698static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
699 enum dma_data_direction direction)
700{
701 struct drm_gem_object *gem = buf->priv;
702 struct tegra_bo *bo = to_tegra_bo(gem);
703 struct drm_device *drm = gem->dev;
704
705 if (bo->pages)
706 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
707
708 return 0;
709}
710
711static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
712{
713 struct drm_gem_object *gem = buf->priv;
714 int err;
715
716 err = drm_gem_mmap_obj(gem, gem->size, vma);
717 if (err < 0)
718 return err;
719
720 return __tegra_gem_mmap(gem, vma);
721}
722
723static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map)
724{
725 struct drm_gem_object *gem = buf->priv;
726 struct tegra_bo *bo = to_tegra_bo(gem);
727 void *vaddr;
728
729 vaddr = tegra_bo_mmap(&bo->base);
730 if (IS_ERR(vaddr))
731 return PTR_ERR(vaddr);
732
733 iosys_map_set_vaddr(map, vaddr);
734
735 return 0;
736}
737
738static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map)
739{
740 struct drm_gem_object *gem = buf->priv;
741 struct tegra_bo *bo = to_tegra_bo(gem);
742
743 tegra_bo_munmap(&bo->base, map->vaddr);
744}
745
746static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
747 .map_dma_buf = tegra_gem_prime_map_dma_buf,
748 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
749 .release = tegra_gem_prime_release,
750 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
751 .end_cpu_access = tegra_gem_prime_end_cpu_access,
752 .mmap = tegra_gem_prime_mmap,
753 .vmap = tegra_gem_prime_vmap,
754 .vunmap = tegra_gem_prime_vunmap,
755};
756
757struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
758 int flags)
759{
760 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
761
762 exp_info.exp_name = KBUILD_MODNAME;
763 exp_info.owner = gem->dev->driver->fops->owner;
764 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
765 exp_info.size = gem->size;
766 exp_info.flags = flags;
767 exp_info.priv = gem;
768
769 return drm_gem_dmabuf_export(gem->dev, &exp_info);
770}
771
772struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
773 struct dma_buf *buf)
774{
775 struct tegra_bo *bo;
776
777 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
778 struct drm_gem_object *gem = buf->priv;
779
780 if (gem->dev == drm) {
781 drm_gem_object_get(gem);
782 return gem;
783 }
784 }
785
786 bo = tegra_bo_import(drm, buf);
787 if (IS_ERR(bo))
788 return ERR_CAST(bo);
789
790 return &bo->gem;
791}
792
793struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle)
794{
795 struct drm_gem_object *gem;
796 struct tegra_bo *bo;
797
798 gem = drm_gem_object_lookup(file, handle);
799 if (!gem)
800 return NULL;
801
802 bo = to_tegra_bo(gem);
803 return &bo->base;
804}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * NVIDIA Tegra DRM GEM helper functions
4 *
5 * Copyright (C) 2012 Sascha Hauer, Pengutronix
6 * Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved.
7 *
8 * Based on the GEM/CMA helpers
9 *
10 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
11 */
12
13#include <linux/dma-buf.h>
14#include <linux/iommu.h>
15#include <linux/module.h>
16
17#include <drm/drm_drv.h>
18#include <drm/drm_prime.h>
19#include <drm/tegra_drm.h>
20
21#include "drm.h"
22#include "gem.h"
23
24MODULE_IMPORT_NS(DMA_BUF);
25
26static unsigned int sg_dma_count_chunks(struct scatterlist *sgl, unsigned int nents)
27{
28 dma_addr_t next = ~(dma_addr_t)0;
29 unsigned int count = 0, i;
30 struct scatterlist *s;
31
32 for_each_sg(sgl, s, nents, i) {
33 /* sg_dma_address(s) is only valid for entries that have sg_dma_len(s) != 0. */
34 if (!sg_dma_len(s))
35 continue;
36
37 if (sg_dma_address(s) != next) {
38 next = sg_dma_address(s) + sg_dma_len(s);
39 count++;
40 }
41 }
42
43 return count;
44}
45
46static inline unsigned int sgt_dma_count_chunks(struct sg_table *sgt)
47{
48 return sg_dma_count_chunks(sgt->sgl, sgt->nents);
49}
50
51static void tegra_bo_put(struct host1x_bo *bo)
52{
53 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
54
55 drm_gem_object_put(&obj->gem);
56}
57
58static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
59 enum dma_data_direction direction)
60{
61 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
62 struct drm_gem_object *gem = &obj->gem;
63 struct host1x_bo_mapping *map;
64 int err;
65
66 map = kzalloc(sizeof(*map), GFP_KERNEL);
67 if (!map)
68 return ERR_PTR(-ENOMEM);
69
70 kref_init(&map->ref);
71 map->bo = host1x_bo_get(bo);
72 map->direction = direction;
73 map->dev = dev;
74
75 /*
76 * Imported buffers need special treatment to satisfy the semantics of DMA-BUF.
77 */
78 if (gem->import_attach) {
79 struct dma_buf *buf = gem->import_attach->dmabuf;
80
81 map->attach = dma_buf_attach(buf, dev);
82 if (IS_ERR(map->attach)) {
83 err = PTR_ERR(map->attach);
84 goto free;
85 }
86
87 map->sgt = dma_buf_map_attachment_unlocked(map->attach, direction);
88 if (IS_ERR(map->sgt)) {
89 dma_buf_detach(buf, map->attach);
90 err = PTR_ERR(map->sgt);
91 map->sgt = NULL;
92 goto free;
93 }
94
95 err = sgt_dma_count_chunks(map->sgt);
96 map->size = gem->size;
97
98 goto out;
99 }
100
101 /*
102 * If we don't have a mapping for this buffer yet, return an SG table
103 * so that host1x can do the mapping for us via the DMA API.
104 */
105 map->sgt = kzalloc(sizeof(*map->sgt), GFP_KERNEL);
106 if (!map->sgt) {
107 err = -ENOMEM;
108 goto free;
109 }
110
111 if (obj->pages) {
112 /*
113 * If the buffer object was allocated from the explicit IOMMU
114 * API code paths, construct an SG table from the pages.
115 */
116 err = sg_alloc_table_from_pages(map->sgt, obj->pages, obj->num_pages, 0, gem->size,
117 GFP_KERNEL);
118 if (err < 0)
119 goto free;
120 } else {
121 /*
122 * If the buffer object had no pages allocated and if it was
123 * not imported, it had to be allocated with the DMA API, so
124 * the DMA API helper can be used.
125 */
126 err = dma_get_sgtable(dev, map->sgt, obj->vaddr, obj->iova, gem->size);
127 if (err < 0)
128 goto free;
129 }
130
131 err = dma_map_sgtable(dev, map->sgt, direction, 0);
132 if (err)
133 goto free_sgt;
134
135out:
136 /*
137 * If we've manually mapped the buffer object through the IOMMU, make sure to return the
138 * existing IOVA address of our mapping.
139 */
140 if (!obj->mm) {
141 map->phys = sg_dma_address(map->sgt->sgl);
142 map->chunks = err;
143 } else {
144 map->phys = obj->iova;
145 map->chunks = 1;
146 }
147
148 map->size = gem->size;
149
150 return map;
151
152free_sgt:
153 sg_free_table(map->sgt);
154free:
155 kfree(map->sgt);
156 kfree(map);
157 return ERR_PTR(err);
158}
159
160static void tegra_bo_unpin(struct host1x_bo_mapping *map)
161{
162 if (map->attach) {
163 dma_buf_unmap_attachment_unlocked(map->attach, map->sgt,
164 map->direction);
165 dma_buf_detach(map->attach->dmabuf, map->attach);
166 } else {
167 dma_unmap_sgtable(map->dev, map->sgt, map->direction, 0);
168 sg_free_table(map->sgt);
169 kfree(map->sgt);
170 }
171
172 host1x_bo_put(map->bo);
173 kfree(map);
174}
175
176static void *tegra_bo_mmap(struct host1x_bo *bo)
177{
178 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
179 struct iosys_map map;
180 int ret;
181
182 if (obj->vaddr) {
183 return obj->vaddr;
184 } else if (obj->gem.import_attach) {
185 ret = dma_buf_vmap_unlocked(obj->gem.import_attach->dmabuf, &map);
186 return ret ? NULL : map.vaddr;
187 } else {
188 return vmap(obj->pages, obj->num_pages, VM_MAP,
189 pgprot_writecombine(PAGE_KERNEL));
190 }
191}
192
193static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
194{
195 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
196 struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr);
197
198 if (obj->vaddr)
199 return;
200 else if (obj->gem.import_attach)
201 dma_buf_vunmap_unlocked(obj->gem.import_attach->dmabuf, &map);
202 else
203 vunmap(addr);
204}
205
206static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
207{
208 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
209
210 drm_gem_object_get(&obj->gem);
211
212 return bo;
213}
214
215static const struct host1x_bo_ops tegra_bo_ops = {
216 .get = tegra_bo_get,
217 .put = tegra_bo_put,
218 .pin = tegra_bo_pin,
219 .unpin = tegra_bo_unpin,
220 .mmap = tegra_bo_mmap,
221 .munmap = tegra_bo_munmap,
222};
223
224static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
225{
226 int prot = IOMMU_READ | IOMMU_WRITE;
227 int err;
228
229 if (bo->mm)
230 return -EBUSY;
231
232 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
233 if (!bo->mm)
234 return -ENOMEM;
235
236 mutex_lock(&tegra->mm_lock);
237
238 err = drm_mm_insert_node_generic(&tegra->mm,
239 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
240 if (err < 0) {
241 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
242 err);
243 goto unlock;
244 }
245
246 bo->iova = bo->mm->start;
247
248 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
249 if (!bo->size) {
250 dev_err(tegra->drm->dev, "failed to map buffer\n");
251 err = -ENOMEM;
252 goto remove;
253 }
254
255 mutex_unlock(&tegra->mm_lock);
256
257 return 0;
258
259remove:
260 drm_mm_remove_node(bo->mm);
261unlock:
262 mutex_unlock(&tegra->mm_lock);
263 kfree(bo->mm);
264 return err;
265}
266
267static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
268{
269 if (!bo->mm)
270 return 0;
271
272 mutex_lock(&tegra->mm_lock);
273 iommu_unmap(tegra->domain, bo->iova, bo->size);
274 drm_mm_remove_node(bo->mm);
275 mutex_unlock(&tegra->mm_lock);
276
277 kfree(bo->mm);
278
279 return 0;
280}
281
282static const struct drm_gem_object_funcs tegra_gem_object_funcs = {
283 .free = tegra_bo_free_object,
284 .export = tegra_gem_prime_export,
285 .vm_ops = &tegra_bo_vm_ops,
286};
287
288static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
289 size_t size)
290{
291 struct tegra_bo *bo;
292 int err;
293
294 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
295 if (!bo)
296 return ERR_PTR(-ENOMEM);
297
298 bo->gem.funcs = &tegra_gem_object_funcs;
299
300 host1x_bo_init(&bo->base, &tegra_bo_ops);
301 size = round_up(size, PAGE_SIZE);
302
303 err = drm_gem_object_init(drm, &bo->gem, size);
304 if (err < 0)
305 goto free;
306
307 err = drm_gem_create_mmap_offset(&bo->gem);
308 if (err < 0)
309 goto release;
310
311 return bo;
312
313release:
314 drm_gem_object_release(&bo->gem);
315free:
316 kfree(bo);
317 return ERR_PTR(err);
318}
319
320static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
321{
322 if (bo->pages) {
323 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
324 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
325 sg_free_table(bo->sgt);
326 kfree(bo->sgt);
327 } else if (bo->vaddr) {
328 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
329 }
330}
331
332static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
333{
334 int err;
335
336 bo->pages = drm_gem_get_pages(&bo->gem);
337 if (IS_ERR(bo->pages))
338 return PTR_ERR(bo->pages);
339
340 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
341
342 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages);
343 if (IS_ERR(bo->sgt)) {
344 err = PTR_ERR(bo->sgt);
345 goto put_pages;
346 }
347
348 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
349 if (err)
350 goto free_sgt;
351
352 return 0;
353
354free_sgt:
355 sg_free_table(bo->sgt);
356 kfree(bo->sgt);
357put_pages:
358 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
359 return err;
360}
361
362static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
363{
364 struct tegra_drm *tegra = drm->dev_private;
365 int err;
366
367 if (tegra->domain) {
368 err = tegra_bo_get_pages(drm, bo);
369 if (err < 0)
370 return err;
371
372 err = tegra_bo_iommu_map(tegra, bo);
373 if (err < 0) {
374 tegra_bo_free(drm, bo);
375 return err;
376 }
377 } else {
378 size_t size = bo->gem.size;
379
380 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
381 GFP_KERNEL | __GFP_NOWARN);
382 if (!bo->vaddr) {
383 dev_err(drm->dev,
384 "failed to allocate buffer of size %zu\n",
385 size);
386 return -ENOMEM;
387 }
388 }
389
390 return 0;
391}
392
393struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
394 unsigned long flags)
395{
396 struct tegra_bo *bo;
397 int err;
398
399 bo = tegra_bo_alloc_object(drm, size);
400 if (IS_ERR(bo))
401 return bo;
402
403 err = tegra_bo_alloc(drm, bo);
404 if (err < 0)
405 goto release;
406
407 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
408 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
409
410 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
411 bo->flags |= TEGRA_BO_BOTTOM_UP;
412
413 return bo;
414
415release:
416 drm_gem_object_release(&bo->gem);
417 kfree(bo);
418 return ERR_PTR(err);
419}
420
421struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
422 struct drm_device *drm,
423 size_t size,
424 unsigned long flags,
425 u32 *handle)
426{
427 struct tegra_bo *bo;
428 int err;
429
430 bo = tegra_bo_create(drm, size, flags);
431 if (IS_ERR(bo))
432 return bo;
433
434 err = drm_gem_handle_create(file, &bo->gem, handle);
435 if (err) {
436 tegra_bo_free_object(&bo->gem);
437 return ERR_PTR(err);
438 }
439
440 drm_gem_object_put(&bo->gem);
441
442 return bo;
443}
444
445static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
446 struct dma_buf *buf)
447{
448 struct tegra_drm *tegra = drm->dev_private;
449 struct dma_buf_attachment *attach;
450 struct tegra_bo *bo;
451 int err;
452
453 bo = tegra_bo_alloc_object(drm, buf->size);
454 if (IS_ERR(bo))
455 return bo;
456
457 attach = dma_buf_attach(buf, drm->dev);
458 if (IS_ERR(attach)) {
459 err = PTR_ERR(attach);
460 goto free;
461 }
462
463 get_dma_buf(buf);
464
465 bo->sgt = dma_buf_map_attachment_unlocked(attach, DMA_TO_DEVICE);
466 if (IS_ERR(bo->sgt)) {
467 err = PTR_ERR(bo->sgt);
468 goto detach;
469 }
470
471 if (tegra->domain) {
472 err = tegra_bo_iommu_map(tegra, bo);
473 if (err < 0)
474 goto detach;
475 }
476
477 bo->gem.import_attach = attach;
478
479 return bo;
480
481detach:
482 if (!IS_ERR_OR_NULL(bo->sgt))
483 dma_buf_unmap_attachment_unlocked(attach, bo->sgt, DMA_TO_DEVICE);
484
485 dma_buf_detach(buf, attach);
486 dma_buf_put(buf);
487free:
488 drm_gem_object_release(&bo->gem);
489 kfree(bo);
490 return ERR_PTR(err);
491}
492
493void tegra_bo_free_object(struct drm_gem_object *gem)
494{
495 struct tegra_drm *tegra = gem->dev->dev_private;
496 struct host1x_bo_mapping *mapping, *tmp;
497 struct tegra_bo *bo = to_tegra_bo(gem);
498
499 /* remove all mappings of this buffer object from any caches */
500 list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) {
501 if (mapping->cache)
502 host1x_bo_unpin(mapping);
503 else
504 dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping,
505 dev_name(mapping->dev));
506 }
507
508 if (tegra->domain)
509 tegra_bo_iommu_unmap(tegra, bo);
510
511 if (gem->import_attach) {
512 dma_buf_unmap_attachment_unlocked(gem->import_attach, bo->sgt,
513 DMA_TO_DEVICE);
514 drm_prime_gem_destroy(gem, NULL);
515 } else {
516 tegra_bo_free(gem->dev, bo);
517 }
518
519 drm_gem_object_release(gem);
520 kfree(bo);
521}
522
523int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
524 struct drm_mode_create_dumb *args)
525{
526 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
527 struct tegra_drm *tegra = drm->dev_private;
528 struct tegra_bo *bo;
529
530 args->pitch = round_up(min_pitch, tegra->pitch_align);
531 args->size = args->pitch * args->height;
532
533 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
534 &args->handle);
535 if (IS_ERR(bo))
536 return PTR_ERR(bo);
537
538 return 0;
539}
540
541static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
542{
543 struct vm_area_struct *vma = vmf->vma;
544 struct drm_gem_object *gem = vma->vm_private_data;
545 struct tegra_bo *bo = to_tegra_bo(gem);
546 struct page *page;
547 pgoff_t offset;
548
549 if (!bo->pages)
550 return VM_FAULT_SIGBUS;
551
552 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
553 page = bo->pages[offset];
554
555 return vmf_insert_page(vma, vmf->address, page);
556}
557
558const struct vm_operations_struct tegra_bo_vm_ops = {
559 .fault = tegra_bo_fault,
560 .open = drm_gem_vm_open,
561 .close = drm_gem_vm_close,
562};
563
564int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
565{
566 struct tegra_bo *bo = to_tegra_bo(gem);
567
568 if (!bo->pages) {
569 unsigned long vm_pgoff = vma->vm_pgoff;
570 int err;
571
572 /*
573 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
574 * and set the vm_pgoff (used as a fake buffer offset by DRM)
575 * to 0 as we want to map the whole buffer.
576 */
577 vma->vm_flags &= ~VM_PFNMAP;
578 vma->vm_pgoff = 0;
579
580 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
581 gem->size);
582 if (err < 0) {
583 drm_gem_vm_close(vma);
584 return err;
585 }
586
587 vma->vm_pgoff = vm_pgoff;
588 } else {
589 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
590
591 vma->vm_flags |= VM_MIXEDMAP;
592 vma->vm_flags &= ~VM_PFNMAP;
593
594 vma->vm_page_prot = pgprot_writecombine(prot);
595 }
596
597 return 0;
598}
599
600int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
601{
602 struct drm_gem_object *gem;
603 int err;
604
605 err = drm_gem_mmap(file, vma);
606 if (err < 0)
607 return err;
608
609 gem = vma->vm_private_data;
610
611 return __tegra_gem_mmap(gem, vma);
612}
613
614static struct sg_table *
615tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
616 enum dma_data_direction dir)
617{
618 struct drm_gem_object *gem = attach->dmabuf->priv;
619 struct tegra_bo *bo = to_tegra_bo(gem);
620 struct sg_table *sgt;
621
622 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
623 if (!sgt)
624 return NULL;
625
626 if (bo->pages) {
627 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
628 0, gem->size, GFP_KERNEL) < 0)
629 goto free;
630 } else {
631 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
632 gem->size) < 0)
633 goto free;
634 }
635
636 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
637 goto free;
638
639 return sgt;
640
641free:
642 sg_free_table(sgt);
643 kfree(sgt);
644 return NULL;
645}
646
647static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
648 struct sg_table *sgt,
649 enum dma_data_direction dir)
650{
651 struct drm_gem_object *gem = attach->dmabuf->priv;
652 struct tegra_bo *bo = to_tegra_bo(gem);
653
654 if (bo->pages)
655 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
656
657 sg_free_table(sgt);
658 kfree(sgt);
659}
660
661static void tegra_gem_prime_release(struct dma_buf *buf)
662{
663 drm_gem_dmabuf_release(buf);
664}
665
666static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
667 enum dma_data_direction direction)
668{
669 struct drm_gem_object *gem = buf->priv;
670 struct tegra_bo *bo = to_tegra_bo(gem);
671 struct drm_device *drm = gem->dev;
672
673 if (bo->pages)
674 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
675
676 return 0;
677}
678
679static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
680 enum dma_data_direction direction)
681{
682 struct drm_gem_object *gem = buf->priv;
683 struct tegra_bo *bo = to_tegra_bo(gem);
684 struct drm_device *drm = gem->dev;
685
686 if (bo->pages)
687 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
688
689 return 0;
690}
691
692static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
693{
694 struct drm_gem_object *gem = buf->priv;
695 int err;
696
697 dma_resv_assert_held(buf->resv);
698
699 err = drm_gem_mmap_obj(gem, gem->size, vma);
700 if (err < 0)
701 return err;
702
703 return __tegra_gem_mmap(gem, vma);
704}
705
706static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map)
707{
708 struct drm_gem_object *gem = buf->priv;
709 struct tegra_bo *bo = to_tegra_bo(gem);
710 void *vaddr;
711
712 vaddr = tegra_bo_mmap(&bo->base);
713 if (IS_ERR(vaddr))
714 return PTR_ERR(vaddr);
715
716 iosys_map_set_vaddr(map, vaddr);
717
718 return 0;
719}
720
721static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map)
722{
723 struct drm_gem_object *gem = buf->priv;
724 struct tegra_bo *bo = to_tegra_bo(gem);
725
726 tegra_bo_munmap(&bo->base, map->vaddr);
727}
728
729static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
730 .map_dma_buf = tegra_gem_prime_map_dma_buf,
731 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
732 .release = tegra_gem_prime_release,
733 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
734 .end_cpu_access = tegra_gem_prime_end_cpu_access,
735 .mmap = tegra_gem_prime_mmap,
736 .vmap = tegra_gem_prime_vmap,
737 .vunmap = tegra_gem_prime_vunmap,
738};
739
740struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
741 int flags)
742{
743 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
744
745 exp_info.exp_name = KBUILD_MODNAME;
746 exp_info.owner = gem->dev->driver->fops->owner;
747 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
748 exp_info.size = gem->size;
749 exp_info.flags = flags;
750 exp_info.priv = gem;
751
752 return drm_gem_dmabuf_export(gem->dev, &exp_info);
753}
754
755struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
756 struct dma_buf *buf)
757{
758 struct tegra_bo *bo;
759
760 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
761 struct drm_gem_object *gem = buf->priv;
762
763 if (gem->dev == drm) {
764 drm_gem_object_get(gem);
765 return gem;
766 }
767 }
768
769 bo = tegra_bo_import(drm, buf);
770 if (IS_ERR(bo))
771 return ERR_CAST(bo);
772
773 return &bo->gem;
774}
775
776struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle)
777{
778 struct drm_gem_object *gem;
779 struct tegra_bo *bo;
780
781 gem = drm_gem_object_lookup(file, handle);
782 if (!gem)
783 return NULL;
784
785 bo = to_tegra_bo(gem);
786 return &bo->base;
787}