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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/*
2 * NVIDIA Tegra DRM GEM helper functions
3 *
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
5 * Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved.
6 *
7 * Based on the GEM/CMA helpers
8 *
9 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16#include <linux/dma-buf.h>
17#include <linux/iommu.h>
18#include <drm/tegra_drm.h>
19
20#include "drm.h"
21#include "gem.h"
22
23static 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_unlocked(&obj->gem);
28}
29
30static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
31{
32 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
33
34 *sgt = obj->sgt;
35
36 return obj->paddr;
37}
38
39static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
40{
41}
42
43static void *tegra_bo_mmap(struct host1x_bo *bo)
44{
45 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
46
47 if (obj->vaddr)
48 return obj->vaddr;
49 else if (obj->gem.import_attach)
50 return dma_buf_vmap(obj->gem.import_attach->dmabuf);
51 else
52 return vmap(obj->pages, obj->num_pages, VM_MAP,
53 pgprot_writecombine(PAGE_KERNEL));
54}
55
56static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
57{
58 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
59
60 if (obj->vaddr)
61 return;
62 else if (obj->gem.import_attach)
63 dma_buf_vunmap(obj->gem.import_attach->dmabuf, addr);
64 else
65 vunmap(addr);
66}
67
68static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
69{
70 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
71
72 if (obj->vaddr)
73 return obj->vaddr + page * PAGE_SIZE;
74 else if (obj->gem.import_attach)
75 return dma_buf_kmap(obj->gem.import_attach->dmabuf, page);
76 else
77 return vmap(obj->pages + page, 1, VM_MAP,
78 pgprot_writecombine(PAGE_KERNEL));
79}
80
81static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
82 void *addr)
83{
84 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
85
86 if (obj->vaddr)
87 return;
88 else if (obj->gem.import_attach)
89 dma_buf_kunmap(obj->gem.import_attach->dmabuf, page, addr);
90 else
91 vunmap(addr);
92}
93
94static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
95{
96 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
97
98 drm_gem_object_get(&obj->gem);
99
100 return bo;
101}
102
103static const struct host1x_bo_ops tegra_bo_ops = {
104 .get = tegra_bo_get,
105 .put = tegra_bo_put,
106 .pin = tegra_bo_pin,
107 .unpin = tegra_bo_unpin,
108 .mmap = tegra_bo_mmap,
109 .munmap = tegra_bo_munmap,
110 .kmap = tegra_bo_kmap,
111 .kunmap = tegra_bo_kunmap,
112};
113
114static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
115{
116 int prot = IOMMU_READ | IOMMU_WRITE;
117 int err;
118
119 if (bo->mm)
120 return -EBUSY;
121
122 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
123 if (!bo->mm)
124 return -ENOMEM;
125
126 mutex_lock(&tegra->mm_lock);
127
128 err = drm_mm_insert_node_generic(&tegra->mm,
129 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
130 if (err < 0) {
131 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
132 err);
133 goto unlock;
134 }
135
136 bo->paddr = bo->mm->start;
137
138 bo->size = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
139 bo->sgt->nents, prot);
140 if (!bo->size) {
141 dev_err(tegra->drm->dev, "failed to map buffer\n");
142 err = -ENOMEM;
143 goto remove;
144 }
145
146 mutex_unlock(&tegra->mm_lock);
147
148 return 0;
149
150remove:
151 drm_mm_remove_node(bo->mm);
152unlock:
153 mutex_unlock(&tegra->mm_lock);
154 kfree(bo->mm);
155 return err;
156}
157
158static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
159{
160 if (!bo->mm)
161 return 0;
162
163 mutex_lock(&tegra->mm_lock);
164 iommu_unmap(tegra->domain, bo->paddr, bo->size);
165 drm_mm_remove_node(bo->mm);
166 mutex_unlock(&tegra->mm_lock);
167
168 kfree(bo->mm);
169
170 return 0;
171}
172
173static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
174 size_t size)
175{
176 struct tegra_bo *bo;
177 int err;
178
179 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
180 if (!bo)
181 return ERR_PTR(-ENOMEM);
182
183 host1x_bo_init(&bo->base, &tegra_bo_ops);
184 size = round_up(size, PAGE_SIZE);
185
186 err = drm_gem_object_init(drm, &bo->gem, size);
187 if (err < 0)
188 goto free;
189
190 err = drm_gem_create_mmap_offset(&bo->gem);
191 if (err < 0)
192 goto release;
193
194 return bo;
195
196release:
197 drm_gem_object_release(&bo->gem);
198free:
199 kfree(bo);
200 return ERR_PTR(err);
201}
202
203static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
204{
205 if (bo->pages) {
206 dma_unmap_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
207 DMA_BIDIRECTIONAL);
208 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
209 sg_free_table(bo->sgt);
210 kfree(bo->sgt);
211 } else if (bo->vaddr) {
212 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
213 }
214}
215
216static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
217{
218 int err;
219
220 bo->pages = drm_gem_get_pages(&bo->gem);
221 if (IS_ERR(bo->pages))
222 return PTR_ERR(bo->pages);
223
224 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
225
226 bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
227 if (IS_ERR(bo->sgt)) {
228 err = PTR_ERR(bo->sgt);
229 goto put_pages;
230 }
231
232 err = dma_map_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
233 DMA_BIDIRECTIONAL);
234 if (err == 0) {
235 err = -EFAULT;
236 goto free_sgt;
237 }
238
239 return 0;
240
241free_sgt:
242 sg_free_table(bo->sgt);
243 kfree(bo->sgt);
244put_pages:
245 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
246 return err;
247}
248
249static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
250{
251 struct tegra_drm *tegra = drm->dev_private;
252 int err;
253
254 if (tegra->domain) {
255 err = tegra_bo_get_pages(drm, bo);
256 if (err < 0)
257 return err;
258
259 err = tegra_bo_iommu_map(tegra, bo);
260 if (err < 0) {
261 tegra_bo_free(drm, bo);
262 return err;
263 }
264 } else {
265 size_t size = bo->gem.size;
266
267 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->paddr,
268 GFP_KERNEL | __GFP_NOWARN);
269 if (!bo->vaddr) {
270 dev_err(drm->dev,
271 "failed to allocate buffer of size %zu\n",
272 size);
273 return -ENOMEM;
274 }
275 }
276
277 return 0;
278}
279
280struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
281 unsigned long flags)
282{
283 struct tegra_bo *bo;
284 int err;
285
286 bo = tegra_bo_alloc_object(drm, size);
287 if (IS_ERR(bo))
288 return bo;
289
290 err = tegra_bo_alloc(drm, bo);
291 if (err < 0)
292 goto release;
293
294 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
295 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
296
297 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
298 bo->flags |= TEGRA_BO_BOTTOM_UP;
299
300 return bo;
301
302release:
303 drm_gem_object_release(&bo->gem);
304 kfree(bo);
305 return ERR_PTR(err);
306}
307
308struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
309 struct drm_device *drm,
310 size_t size,
311 unsigned long flags,
312 u32 *handle)
313{
314 struct tegra_bo *bo;
315 int err;
316
317 bo = tegra_bo_create(drm, size, flags);
318 if (IS_ERR(bo))
319 return bo;
320
321 err = drm_gem_handle_create(file, &bo->gem, handle);
322 if (err) {
323 tegra_bo_free_object(&bo->gem);
324 return ERR_PTR(err);
325 }
326
327 drm_gem_object_put_unlocked(&bo->gem);
328
329 return bo;
330}
331
332static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
333 struct dma_buf *buf)
334{
335 struct tegra_drm *tegra = drm->dev_private;
336 struct dma_buf_attachment *attach;
337 struct tegra_bo *bo;
338 int err;
339
340 bo = tegra_bo_alloc_object(drm, buf->size);
341 if (IS_ERR(bo))
342 return bo;
343
344 attach = dma_buf_attach(buf, drm->dev);
345 if (IS_ERR(attach)) {
346 err = PTR_ERR(attach);
347 goto free;
348 }
349
350 get_dma_buf(buf);
351
352 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
353 if (IS_ERR(bo->sgt)) {
354 err = PTR_ERR(bo->sgt);
355 goto detach;
356 }
357
358 if (tegra->domain) {
359 err = tegra_bo_iommu_map(tegra, bo);
360 if (err < 0)
361 goto detach;
362 } else {
363 if (bo->sgt->nents > 1) {
364 err = -EINVAL;
365 goto detach;
366 }
367
368 bo->paddr = sg_dma_address(bo->sgt->sgl);
369 }
370
371 bo->gem.import_attach = attach;
372
373 return bo;
374
375detach:
376 if (!IS_ERR_OR_NULL(bo->sgt))
377 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
378
379 dma_buf_detach(buf, attach);
380 dma_buf_put(buf);
381free:
382 drm_gem_object_release(&bo->gem);
383 kfree(bo);
384 return ERR_PTR(err);
385}
386
387void tegra_bo_free_object(struct drm_gem_object *gem)
388{
389 struct tegra_drm *tegra = gem->dev->dev_private;
390 struct tegra_bo *bo = to_tegra_bo(gem);
391
392 if (tegra->domain)
393 tegra_bo_iommu_unmap(tegra, bo);
394
395 if (gem->import_attach) {
396 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
397 DMA_TO_DEVICE);
398 drm_prime_gem_destroy(gem, NULL);
399 } else {
400 tegra_bo_free(gem->dev, bo);
401 }
402
403 drm_gem_object_release(gem);
404 kfree(bo);
405}
406
407int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
408 struct drm_mode_create_dumb *args)
409{
410 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
411 struct tegra_drm *tegra = drm->dev_private;
412 struct tegra_bo *bo;
413
414 args->pitch = round_up(min_pitch, tegra->pitch_align);
415 args->size = args->pitch * args->height;
416
417 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
418 &args->handle);
419 if (IS_ERR(bo))
420 return PTR_ERR(bo);
421
422 return 0;
423}
424
425static int tegra_bo_fault(struct vm_fault *vmf)
426{
427 struct vm_area_struct *vma = vmf->vma;
428 struct drm_gem_object *gem = vma->vm_private_data;
429 struct tegra_bo *bo = to_tegra_bo(gem);
430 struct page *page;
431 pgoff_t offset;
432 int err;
433
434 if (!bo->pages)
435 return VM_FAULT_SIGBUS;
436
437 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
438 page = bo->pages[offset];
439
440 err = vm_insert_page(vma, vmf->address, page);
441 switch (err) {
442 case -EAGAIN:
443 case 0:
444 case -ERESTARTSYS:
445 case -EINTR:
446 case -EBUSY:
447 return VM_FAULT_NOPAGE;
448
449 case -ENOMEM:
450 return VM_FAULT_OOM;
451 }
452
453 return VM_FAULT_SIGBUS;
454}
455
456const struct vm_operations_struct tegra_bo_vm_ops = {
457 .fault = tegra_bo_fault,
458 .open = drm_gem_vm_open,
459 .close = drm_gem_vm_close,
460};
461
462int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
463{
464 struct tegra_bo *bo = to_tegra_bo(gem);
465
466 if (!bo->pages) {
467 unsigned long vm_pgoff = vma->vm_pgoff;
468 int err;
469
470 /*
471 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
472 * and set the vm_pgoff (used as a fake buffer offset by DRM)
473 * to 0 as we want to map the whole buffer.
474 */
475 vma->vm_flags &= ~VM_PFNMAP;
476 vma->vm_pgoff = 0;
477
478 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr,
479 gem->size);
480 if (err < 0) {
481 drm_gem_vm_close(vma);
482 return err;
483 }
484
485 vma->vm_pgoff = vm_pgoff;
486 } else {
487 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
488
489 vma->vm_flags |= VM_MIXEDMAP;
490 vma->vm_flags &= ~VM_PFNMAP;
491
492 vma->vm_page_prot = pgprot_writecombine(prot);
493 }
494
495 return 0;
496}
497
498int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
499{
500 struct drm_gem_object *gem;
501 int err;
502
503 err = drm_gem_mmap(file, vma);
504 if (err < 0)
505 return err;
506
507 gem = vma->vm_private_data;
508
509 return __tegra_gem_mmap(gem, vma);
510}
511
512static struct sg_table *
513tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
514 enum dma_data_direction dir)
515{
516 struct drm_gem_object *gem = attach->dmabuf->priv;
517 struct tegra_bo *bo = to_tegra_bo(gem);
518 struct sg_table *sgt;
519
520 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
521 if (!sgt)
522 return NULL;
523
524 if (bo->pages) {
525 struct scatterlist *sg;
526 unsigned int i;
527
528 if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
529 goto free;
530
531 for_each_sg(sgt->sgl, sg, bo->num_pages, i)
532 sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
533
534 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
535 goto free;
536 } else {
537 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
538 goto free;
539
540 sg_dma_address(sgt->sgl) = bo->paddr;
541 sg_dma_len(sgt->sgl) = gem->size;
542 }
543
544 return sgt;
545
546free:
547 sg_free_table(sgt);
548 kfree(sgt);
549 return NULL;
550}
551
552static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
553 struct sg_table *sgt,
554 enum dma_data_direction dir)
555{
556 struct drm_gem_object *gem = attach->dmabuf->priv;
557 struct tegra_bo *bo = to_tegra_bo(gem);
558
559 if (bo->pages)
560 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
561
562 sg_free_table(sgt);
563 kfree(sgt);
564}
565
566static void tegra_gem_prime_release(struct dma_buf *buf)
567{
568 drm_gem_dmabuf_release(buf);
569}
570
571static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
572 enum dma_data_direction direction)
573{
574 struct drm_gem_object *gem = buf->priv;
575 struct tegra_bo *bo = to_tegra_bo(gem);
576 struct drm_device *drm = gem->dev;
577
578 if (bo->pages)
579 dma_sync_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents,
580 DMA_FROM_DEVICE);
581
582 return 0;
583}
584
585static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
586 enum dma_data_direction direction)
587{
588 struct drm_gem_object *gem = buf->priv;
589 struct tegra_bo *bo = to_tegra_bo(gem);
590 struct drm_device *drm = gem->dev;
591
592 if (bo->pages)
593 dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
594 DMA_TO_DEVICE);
595
596 return 0;
597}
598
599static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
600 unsigned long page)
601{
602 return NULL;
603}
604
605static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
606 unsigned long page,
607 void *addr)
608{
609}
610
611static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
612{
613 return NULL;
614}
615
616static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
617 void *addr)
618{
619}
620
621static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
622{
623 struct drm_gem_object *gem = buf->priv;
624 int err;
625
626 err = drm_gem_mmap_obj(gem, gem->size, vma);
627 if (err < 0)
628 return err;
629
630 return __tegra_gem_mmap(gem, vma);
631}
632
633static void *tegra_gem_prime_vmap(struct dma_buf *buf)
634{
635 struct drm_gem_object *gem = buf->priv;
636 struct tegra_bo *bo = to_tegra_bo(gem);
637
638 return bo->vaddr;
639}
640
641static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
642{
643}
644
645static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
646 .map_dma_buf = tegra_gem_prime_map_dma_buf,
647 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
648 .release = tegra_gem_prime_release,
649 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
650 .end_cpu_access = tegra_gem_prime_end_cpu_access,
651 .map_atomic = tegra_gem_prime_kmap_atomic,
652 .unmap_atomic = tegra_gem_prime_kunmap_atomic,
653 .map = tegra_gem_prime_kmap,
654 .unmap = tegra_gem_prime_kunmap,
655 .mmap = tegra_gem_prime_mmap,
656 .vmap = tegra_gem_prime_vmap,
657 .vunmap = tegra_gem_prime_vunmap,
658};
659
660struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
661 struct drm_gem_object *gem,
662 int flags)
663{
664 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
665
666 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
667 exp_info.size = gem->size;
668 exp_info.flags = flags;
669 exp_info.priv = gem;
670
671 return drm_gem_dmabuf_export(drm, &exp_info);
672}
673
674struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
675 struct dma_buf *buf)
676{
677 struct tegra_bo *bo;
678
679 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
680 struct drm_gem_object *gem = buf->priv;
681
682 if (gem->dev == drm) {
683 drm_gem_object_get(gem);
684 return gem;
685 }
686 }
687
688 bo = tegra_bo_import(drm, buf);
689 if (IS_ERR(bo))
690 return ERR_CAST(bo);
691
692 return &bo->gem;
693}