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