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(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(map->attach, map->sgt, map->direction);
164 dma_buf_detach(map->attach->dmabuf, map->attach);
165 } else {
166 dma_unmap_sgtable(map->dev, map->sgt, map->direction, 0);
167 sg_free_table(map->sgt);
168 kfree(map->sgt);
169 }
170
171 host1x_bo_put(map->bo);
172 kfree(map);
173 }
174
tegra_bo_mmap(struct host1x_bo * bo)175 static void *tegra_bo_mmap(struct host1x_bo *bo)
176 {
177 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
178 struct iosys_map map;
179 int ret;
180
181 if (obj->vaddr) {
182 return obj->vaddr;
183 } else if (obj->gem.import_attach) {
184 ret = dma_buf_vmap(obj->gem.import_attach->dmabuf, &map);
185 return ret ? NULL : map.vaddr;
186 } else {
187 return vmap(obj->pages, obj->num_pages, VM_MAP,
188 pgprot_writecombine(PAGE_KERNEL));
189 }
190 }
191
tegra_bo_munmap(struct host1x_bo * bo,void * addr)192 static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
193 {
194 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
195 struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr);
196
197 if (obj->vaddr)
198 return;
199 else if (obj->gem.import_attach)
200 dma_buf_vunmap(obj->gem.import_attach->dmabuf, &map);
201 else
202 vunmap(addr);
203 }
204
tegra_bo_get(struct host1x_bo * bo)205 static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
206 {
207 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
208
209 drm_gem_object_get(&obj->gem);
210
211 return bo;
212 }
213
214 static const struct host1x_bo_ops tegra_bo_ops = {
215 .get = tegra_bo_get,
216 .put = tegra_bo_put,
217 .pin = tegra_bo_pin,
218 .unpin = tegra_bo_unpin,
219 .mmap = tegra_bo_mmap,
220 .munmap = tegra_bo_munmap,
221 };
222
tegra_bo_iommu_map(struct tegra_drm * tegra,struct tegra_bo * bo)223 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
224 {
225 int prot = IOMMU_READ | IOMMU_WRITE;
226 int err;
227
228 if (bo->mm)
229 return -EBUSY;
230
231 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
232 if (!bo->mm)
233 return -ENOMEM;
234
235 mutex_lock(&tegra->mm_lock);
236
237 err = drm_mm_insert_node_generic(&tegra->mm,
238 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
239 if (err < 0) {
240 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
241 err);
242 goto unlock;
243 }
244
245 bo->iova = bo->mm->start;
246
247 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
248 if (!bo->size) {
249 dev_err(tegra->drm->dev, "failed to map buffer\n");
250 err = -ENOMEM;
251 goto remove;
252 }
253
254 mutex_unlock(&tegra->mm_lock);
255
256 return 0;
257
258 remove:
259 drm_mm_remove_node(bo->mm);
260 unlock:
261 mutex_unlock(&tegra->mm_lock);
262 kfree(bo->mm);
263 return err;
264 }
265
tegra_bo_iommu_unmap(struct tegra_drm * tegra,struct tegra_bo * bo)266 static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
267 {
268 if (!bo->mm)
269 return 0;
270
271 mutex_lock(&tegra->mm_lock);
272 iommu_unmap(tegra->domain, bo->iova, bo->size);
273 drm_mm_remove_node(bo->mm);
274 mutex_unlock(&tegra->mm_lock);
275
276 kfree(bo->mm);
277
278 return 0;
279 }
280
281 static const struct drm_gem_object_funcs tegra_gem_object_funcs = {
282 .free = tegra_bo_free_object,
283 .export = tegra_gem_prime_export,
284 .vm_ops = &tegra_bo_vm_ops,
285 };
286
tegra_bo_alloc_object(struct drm_device * drm,size_t size)287 static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
288 size_t size)
289 {
290 struct tegra_bo *bo;
291 int err;
292
293 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
294 if (!bo)
295 return ERR_PTR(-ENOMEM);
296
297 bo->gem.funcs = &tegra_gem_object_funcs;
298
299 host1x_bo_init(&bo->base, &tegra_bo_ops);
300 size = round_up(size, PAGE_SIZE);
301
302 err = drm_gem_object_init(drm, &bo->gem, size);
303 if (err < 0)
304 goto free;
305
306 err = drm_gem_create_mmap_offset(&bo->gem);
307 if (err < 0)
308 goto release;
309
310 return bo;
311
312 release:
313 drm_gem_object_release(&bo->gem);
314 free:
315 kfree(bo);
316 return ERR_PTR(err);
317 }
318
tegra_bo_free(struct drm_device * drm,struct tegra_bo * bo)319 static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
320 {
321 if (bo->pages) {
322 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
323 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
324 sg_free_table(bo->sgt);
325 kfree(bo->sgt);
326 } else if (bo->vaddr) {
327 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
328 }
329 }
330
tegra_bo_get_pages(struct drm_device * drm,struct tegra_bo * bo)331 static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
332 {
333 int err;
334
335 bo->pages = drm_gem_get_pages(&bo->gem);
336 if (IS_ERR(bo->pages))
337 return PTR_ERR(bo->pages);
338
339 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
340
341 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages);
342 if (IS_ERR(bo->sgt)) {
343 err = PTR_ERR(bo->sgt);
344 goto put_pages;
345 }
346
347 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
348 if (err)
349 goto free_sgt;
350
351 return 0;
352
353 free_sgt:
354 sg_free_table(bo->sgt);
355 kfree(bo->sgt);
356 put_pages:
357 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
358 return err;
359 }
360
tegra_bo_alloc(struct drm_device * drm,struct tegra_bo * bo)361 static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
362 {
363 struct tegra_drm *tegra = drm->dev_private;
364 int err;
365
366 if (tegra->domain) {
367 err = tegra_bo_get_pages(drm, bo);
368 if (err < 0)
369 return err;
370
371 err = tegra_bo_iommu_map(tegra, bo);
372 if (err < 0) {
373 tegra_bo_free(drm, bo);
374 return err;
375 }
376 } else {
377 size_t size = bo->gem.size;
378
379 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
380 GFP_KERNEL | __GFP_NOWARN);
381 if (!bo->vaddr) {
382 dev_err(drm->dev,
383 "failed to allocate buffer of size %zu\n",
384 size);
385 return -ENOMEM;
386 }
387 }
388
389 return 0;
390 }
391
tegra_bo_create(struct drm_device * drm,size_t size,unsigned long flags)392 struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
393 unsigned long flags)
394 {
395 struct tegra_bo *bo;
396 int err;
397
398 bo = tegra_bo_alloc_object(drm, size);
399 if (IS_ERR(bo))
400 return bo;
401
402 err = tegra_bo_alloc(drm, bo);
403 if (err < 0)
404 goto release;
405
406 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
407 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
408
409 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
410 bo->flags |= TEGRA_BO_BOTTOM_UP;
411
412 return bo;
413
414 release:
415 drm_gem_object_release(&bo->gem);
416 kfree(bo);
417 return ERR_PTR(err);
418 }
419
tegra_bo_create_with_handle(struct drm_file * file,struct drm_device * drm,size_t size,unsigned long flags,u32 * handle)420 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
421 struct drm_device *drm,
422 size_t size,
423 unsigned long flags,
424 u32 *handle)
425 {
426 struct tegra_bo *bo;
427 int err;
428
429 bo = tegra_bo_create(drm, size, flags);
430 if (IS_ERR(bo))
431 return bo;
432
433 err = drm_gem_handle_create(file, &bo->gem, handle);
434 if (err) {
435 tegra_bo_free_object(&bo->gem);
436 return ERR_PTR(err);
437 }
438
439 drm_gem_object_put(&bo->gem);
440
441 return bo;
442 }
443
tegra_bo_import(struct drm_device * drm,struct dma_buf * buf)444 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
445 struct dma_buf *buf)
446 {
447 struct tegra_drm *tegra = drm->dev_private;
448 struct dma_buf_attachment *attach;
449 struct tegra_bo *bo;
450 int err;
451
452 bo = tegra_bo_alloc_object(drm, buf->size);
453 if (IS_ERR(bo))
454 return bo;
455
456 attach = dma_buf_attach(buf, drm->dev);
457 if (IS_ERR(attach)) {
458 err = PTR_ERR(attach);
459 goto free;
460 }
461
462 get_dma_buf(buf);
463
464 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
465 if (IS_ERR(bo->sgt)) {
466 err = PTR_ERR(bo->sgt);
467 goto detach;
468 }
469
470 if (tegra->domain) {
471 err = tegra_bo_iommu_map(tegra, bo);
472 if (err < 0)
473 goto detach;
474 }
475
476 bo->gem.import_attach = attach;
477
478 return bo;
479
480 detach:
481 if (!IS_ERR_OR_NULL(bo->sgt))
482 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
483
484 dma_buf_detach(buf, attach);
485 dma_buf_put(buf);
486 free:
487 drm_gem_object_release(&bo->gem);
488 kfree(bo);
489 return ERR_PTR(err);
490 }
491
tegra_bo_free_object(struct drm_gem_object * gem)492 void tegra_bo_free_object(struct drm_gem_object *gem)
493 {
494 struct tegra_drm *tegra = gem->dev->dev_private;
495 struct host1x_bo_mapping *mapping, *tmp;
496 struct tegra_bo *bo = to_tegra_bo(gem);
497
498 /* remove all mappings of this buffer object from any caches */
499 list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) {
500 if (mapping->cache)
501 host1x_bo_unpin(mapping);
502 else
503 dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping,
504 dev_name(mapping->dev));
505 }
506
507 if (tegra->domain)
508 tegra_bo_iommu_unmap(tegra, bo);
509
510 if (gem->import_attach) {
511 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
512 DMA_TO_DEVICE);
513 drm_prime_gem_destroy(gem, NULL);
514 } else {
515 tegra_bo_free(gem->dev, bo);
516 }
517
518 drm_gem_object_release(gem);
519 kfree(bo);
520 }
521
tegra_bo_dumb_create(struct drm_file * file,struct drm_device * drm,struct drm_mode_create_dumb * args)522 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
523 struct drm_mode_create_dumb *args)
524 {
525 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
526 struct tegra_drm *tegra = drm->dev_private;
527 struct tegra_bo *bo;
528
529 args->pitch = round_up(min_pitch, tegra->pitch_align);
530 args->size = args->pitch * args->height;
531
532 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
533 &args->handle);
534 if (IS_ERR(bo))
535 return PTR_ERR(bo);
536
537 return 0;
538 }
539
tegra_bo_fault(struct vm_fault * vmf)540 static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
541 {
542 struct vm_area_struct *vma = vmf->vma;
543 struct drm_gem_object *gem = vma->vm_private_data;
544 struct tegra_bo *bo = to_tegra_bo(gem);
545 struct page *page;
546 pgoff_t offset;
547
548 if (!bo->pages)
549 return VM_FAULT_SIGBUS;
550
551 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
552 page = bo->pages[offset];
553
554 return vmf_insert_page(vma, vmf->address, page);
555 }
556
557 const struct vm_operations_struct tegra_bo_vm_ops = {
558 .fault = tegra_bo_fault,
559 .open = drm_gem_vm_open,
560 .close = drm_gem_vm_close,
561 };
562
__tegra_gem_mmap(struct drm_gem_object * gem,struct vm_area_struct * vma)563 int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
564 {
565 struct tegra_bo *bo = to_tegra_bo(gem);
566
567 if (!bo->pages) {
568 unsigned long vm_pgoff = vma->vm_pgoff;
569 int err;
570
571 /*
572 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
573 * and set the vm_pgoff (used as a fake buffer offset by DRM)
574 * to 0 as we want to map the whole buffer.
575 */
576 vma->vm_flags &= ~VM_PFNMAP;
577 vma->vm_pgoff = 0;
578
579 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
580 gem->size);
581 if (err < 0) {
582 drm_gem_vm_close(vma);
583 return err;
584 }
585
586 vma->vm_pgoff = vm_pgoff;
587 } else {
588 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
589
590 vma->vm_flags |= VM_MIXEDMAP;
591 vma->vm_flags &= ~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 err = drm_gem_mmap_obj(gem, gem->size, vma);
697 if (err < 0)
698 return err;
699
700 return __tegra_gem_mmap(gem, vma);
701 }
702
tegra_gem_prime_vmap(struct dma_buf * buf,struct iosys_map * map)703 static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map)
704 {
705 struct drm_gem_object *gem = buf->priv;
706 struct tegra_bo *bo = to_tegra_bo(gem);
707 void *vaddr;
708
709 vaddr = tegra_bo_mmap(&bo->base);
710 if (IS_ERR(vaddr))
711 return PTR_ERR(vaddr);
712
713 iosys_map_set_vaddr(map, vaddr);
714
715 return 0;
716 }
717
tegra_gem_prime_vunmap(struct dma_buf * buf,struct iosys_map * map)718 static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map)
719 {
720 struct drm_gem_object *gem = buf->priv;
721 struct tegra_bo *bo = to_tegra_bo(gem);
722
723 tegra_bo_munmap(&bo->base, map->vaddr);
724 }
725
726 static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
727 .map_dma_buf = tegra_gem_prime_map_dma_buf,
728 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
729 .release = tegra_gem_prime_release,
730 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
731 .end_cpu_access = tegra_gem_prime_end_cpu_access,
732 .mmap = tegra_gem_prime_mmap,
733 .vmap = tegra_gem_prime_vmap,
734 .vunmap = tegra_gem_prime_vunmap,
735 };
736
tegra_gem_prime_export(struct drm_gem_object * gem,int flags)737 struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
738 int flags)
739 {
740 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
741
742 exp_info.exp_name = KBUILD_MODNAME;
743 exp_info.owner = gem->dev->driver->fops->owner;
744 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
745 exp_info.size = gem->size;
746 exp_info.flags = flags;
747 exp_info.priv = gem;
748
749 return drm_gem_dmabuf_export(gem->dev, &exp_info);
750 }
751
tegra_gem_prime_import(struct drm_device * drm,struct dma_buf * buf)752 struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
753 struct dma_buf *buf)
754 {
755 struct tegra_bo *bo;
756
757 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
758 struct drm_gem_object *gem = buf->priv;
759
760 if (gem->dev == drm) {
761 drm_gem_object_get(gem);
762 return gem;
763 }
764 }
765
766 bo = tegra_bo_import(drm, buf);
767 if (IS_ERR(bo))
768 return ERR_CAST(bo);
769
770 return &bo->gem;
771 }
772
tegra_gem_lookup(struct drm_file * file,u32 handle)773 struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle)
774 {
775 struct drm_gem_object *gem;
776 struct tegra_bo *bo;
777
778 gem = drm_gem_object_lookup(file, handle);
779 if (!gem)
780 return NULL;
781
782 bo = to_tegra_bo(gem);
783 return &bo->base;
784 }
785