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
24 MODULE_IMPORT_NS(DMA_BUF);
25
sg_dma_count_chunks(struct scatterlist * sgl,unsigned int nents)26 static 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
sgt_dma_count_chunks(struct sg_table * sgt)46 static inline unsigned int sgt_dma_count_chunks(struct sg_table *sgt)
47 {
48 return sg_dma_count_chunks(sgt->sgl, sgt->nents);
49 }
50
tegra_bo_put(struct host1x_bo * bo)51 static 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
tegra_bo_pin(struct device * dev,struct host1x_bo * bo,enum dma_data_direction direction)58 static 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
135 out:
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
152 free_sgt:
153 sg_free_table(map->sgt);
154 free:
155 kfree(map->sgt);
156 kfree(map);
157 return ERR_PTR(err);
158 }
159
tegra_bo_unpin(struct host1x_bo_mapping * map)160 static 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
tegra_bo_mmap(struct host1x_bo * bo)176 static 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
tegra_bo_munmap(struct host1x_bo * bo,void * addr)193 static 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
tegra_bo_get(struct host1x_bo * bo)206 static 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
215 static 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
tegra_bo_iommu_map(struct tegra_drm * tegra,struct tegra_bo * bo)224 static 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
259 remove:
260 drm_mm_remove_node(bo->mm);
261 unlock:
262 mutex_unlock(&tegra->mm_lock);
263 kfree(bo->mm);
264 return err;
265 }
266
tegra_bo_iommu_unmap(struct tegra_drm * tegra,struct tegra_bo * bo)267 static 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
282 static 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
tegra_bo_alloc_object(struct drm_device * drm,size_t size)288 static 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
313 release:
314 drm_gem_object_release(&bo->gem);
315 free:
316 kfree(bo);
317 return ERR_PTR(err);
318 }
319
tegra_bo_free(struct drm_device * drm,struct tegra_bo * bo)320 static 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
tegra_bo_get_pages(struct drm_device * drm,struct tegra_bo * bo)332 static 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
354 free_sgt:
355 sg_free_table(bo->sgt);
356 kfree(bo->sgt);
357 put_pages:
358 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
359 return err;
360 }
361
tegra_bo_alloc(struct drm_device * drm,struct tegra_bo * bo)362 static 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
tegra_bo_create(struct drm_device * drm,size_t size,unsigned long flags)393 struct 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
415 release:
416 drm_gem_object_release(&bo->gem);
417 kfree(bo);
418 return ERR_PTR(err);
419 }
420
tegra_bo_create_with_handle(struct drm_file * file,struct drm_device * drm,size_t size,unsigned long flags,u32 * handle)421 struct 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
tegra_bo_import(struct drm_device * drm,struct dma_buf * buf)445 static 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
481 detach:
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);
487 free:
488 drm_gem_object_release(&bo->gem);
489 kfree(bo);
490 return ERR_PTR(err);
491 }
492
tegra_bo_free_object(struct drm_gem_object * gem)493 void 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
tegra_bo_dumb_create(struct drm_file * file,struct drm_device * drm,struct drm_mode_create_dumb * args)523 int 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
tegra_bo_fault(struct vm_fault * vmf)541 static 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
558 const 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
__tegra_gem_mmap(struct drm_gem_object * gem,struct vm_area_struct * vma)564 int __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 vm_flags_clear(vma, 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 vm_flags_mod(vma, VM_MIXEDMAP, VM_PFNMAP);
592
593 vma->vm_page_prot = pgprot_writecombine(prot);
594 }
595
596 return 0;
597 }
598
tegra_drm_mmap(struct file * file,struct vm_area_struct * vma)599 int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
600 {
601 struct drm_gem_object *gem;
602 int err;
603
604 err = drm_gem_mmap(file, vma);
605 if (err < 0)
606 return err;
607
608 gem = vma->vm_private_data;
609
610 return __tegra_gem_mmap(gem, vma);
611 }
612
613 static struct sg_table *
tegra_gem_prime_map_dma_buf(struct dma_buf_attachment * attach,enum dma_data_direction dir)614 tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
615 enum dma_data_direction dir)
616 {
617 struct drm_gem_object *gem = attach->dmabuf->priv;
618 struct tegra_bo *bo = to_tegra_bo(gem);
619 struct sg_table *sgt;
620
621 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
622 if (!sgt)
623 return NULL;
624
625 if (bo->pages) {
626 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
627 0, gem->size, GFP_KERNEL) < 0)
628 goto free;
629 } else {
630 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
631 gem->size) < 0)
632 goto free;
633 }
634
635 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
636 goto free;
637
638 return sgt;
639
640 free:
641 sg_free_table(sgt);
642 kfree(sgt);
643 return NULL;
644 }
645
tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment * attach,struct sg_table * sgt,enum dma_data_direction dir)646 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
647 struct sg_table *sgt,
648 enum dma_data_direction dir)
649 {
650 struct drm_gem_object *gem = attach->dmabuf->priv;
651 struct tegra_bo *bo = to_tegra_bo(gem);
652
653 if (bo->pages)
654 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
655
656 sg_free_table(sgt);
657 kfree(sgt);
658 }
659
tegra_gem_prime_release(struct dma_buf * buf)660 static void tegra_gem_prime_release(struct dma_buf *buf)
661 {
662 drm_gem_dmabuf_release(buf);
663 }
664
tegra_gem_prime_begin_cpu_access(struct dma_buf * buf,enum dma_data_direction direction)665 static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
666 enum dma_data_direction direction)
667 {
668 struct drm_gem_object *gem = buf->priv;
669 struct tegra_bo *bo = to_tegra_bo(gem);
670 struct drm_device *drm = gem->dev;
671
672 if (bo->pages)
673 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
674
675 return 0;
676 }
677
tegra_gem_prime_end_cpu_access(struct dma_buf * buf,enum dma_data_direction direction)678 static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
679 enum dma_data_direction direction)
680 {
681 struct drm_gem_object *gem = buf->priv;
682 struct tegra_bo *bo = to_tegra_bo(gem);
683 struct drm_device *drm = gem->dev;
684
685 if (bo->pages)
686 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
687
688 return 0;
689 }
690
tegra_gem_prime_mmap(struct dma_buf * buf,struct vm_area_struct * vma)691 static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
692 {
693 struct drm_gem_object *gem = buf->priv;
694 int err;
695
696 dma_resv_assert_held(buf->resv);
697
698 err = drm_gem_mmap_obj(gem, gem->size, vma);
699 if (err < 0)
700 return err;
701
702 return __tegra_gem_mmap(gem, vma);
703 }
704
tegra_gem_prime_vmap(struct dma_buf * buf,struct iosys_map * map)705 static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map)
706 {
707 struct drm_gem_object *gem = buf->priv;
708 struct tegra_bo *bo = to_tegra_bo(gem);
709 void *vaddr;
710
711 vaddr = tegra_bo_mmap(&bo->base);
712 if (IS_ERR(vaddr))
713 return PTR_ERR(vaddr);
714
715 iosys_map_set_vaddr(map, vaddr);
716
717 return 0;
718 }
719
tegra_gem_prime_vunmap(struct dma_buf * buf,struct iosys_map * map)720 static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map)
721 {
722 struct drm_gem_object *gem = buf->priv;
723 struct tegra_bo *bo = to_tegra_bo(gem);
724
725 tegra_bo_munmap(&bo->base, map->vaddr);
726 }
727
728 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
729 .map_dma_buf = tegra_gem_prime_map_dma_buf,
730 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
731 .release = tegra_gem_prime_release,
732 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
733 .end_cpu_access = tegra_gem_prime_end_cpu_access,
734 .mmap = tegra_gem_prime_mmap,
735 .vmap = tegra_gem_prime_vmap,
736 .vunmap = tegra_gem_prime_vunmap,
737 };
738
tegra_gem_prime_export(struct drm_gem_object * gem,int flags)739 struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
740 int flags)
741 {
742 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
743
744 exp_info.exp_name = KBUILD_MODNAME;
745 exp_info.owner = gem->dev->driver->fops->owner;
746 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
747 exp_info.size = gem->size;
748 exp_info.flags = flags;
749 exp_info.priv = gem;
750
751 return drm_gem_dmabuf_export(gem->dev, &exp_info);
752 }
753
tegra_gem_prime_import(struct drm_device * drm,struct dma_buf * buf)754 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
755 struct dma_buf *buf)
756 {
757 struct tegra_bo *bo;
758
759 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
760 struct drm_gem_object *gem = buf->priv;
761
762 if (gem->dev == drm) {
763 drm_gem_object_get(gem);
764 return gem;
765 }
766 }
767
768 bo = tegra_bo_import(drm, buf);
769 if (IS_ERR(bo))
770 return ERR_CAST(bo);
771
772 return &bo->gem;
773 }
774
tegra_gem_lookup(struct drm_file * file,u32 handle)775 struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle)
776 {
777 struct drm_gem_object *gem;
778 struct tegra_bo *bo;
779
780 gem = drm_gem_object_lookup(file, handle);
781 if (!gem)
782 return NULL;
783
784 bo = to_tegra_bo(gem);
785 return &bo->base;
786 }
787