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