Loading...
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 inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
24{
25 return container_of(bo, struct tegra_bo, base);
26}
27
28static void tegra_bo_put(struct host1x_bo *bo)
29{
30 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
31
32 drm_gem_object_unreference_unlocked(&obj->gem);
33}
34
35static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
36{
37 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
38
39 *sgt = obj->sgt;
40
41 return obj->paddr;
42}
43
44static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
45{
46}
47
48static void *tegra_bo_mmap(struct host1x_bo *bo)
49{
50 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
51
52 if (obj->vaddr)
53 return obj->vaddr;
54 else if (obj->gem.import_attach)
55 return dma_buf_vmap(obj->gem.import_attach->dmabuf);
56 else
57 return vmap(obj->pages, obj->num_pages, VM_MAP,
58 pgprot_writecombine(PAGE_KERNEL));
59}
60
61static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
62{
63 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
64
65 if (obj->vaddr)
66 return;
67 else if (obj->gem.import_attach)
68 dma_buf_vunmap(obj->gem.import_attach->dmabuf, addr);
69 else
70 vunmap(addr);
71}
72
73static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
74{
75 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
76
77 if (obj->vaddr)
78 return obj->vaddr + page * PAGE_SIZE;
79 else if (obj->gem.import_attach)
80 return dma_buf_kmap(obj->gem.import_attach->dmabuf, page);
81 else
82 return vmap(obj->pages + page, 1, VM_MAP,
83 pgprot_writecombine(PAGE_KERNEL));
84}
85
86static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
87 void *addr)
88{
89 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
90
91 if (obj->vaddr)
92 return;
93 else if (obj->gem.import_attach)
94 dma_buf_kunmap(obj->gem.import_attach->dmabuf, page, addr);
95 else
96 vunmap(addr);
97}
98
99static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
100{
101 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
102
103 drm_gem_object_reference(&obj->gem);
104
105 return bo;
106}
107
108static const struct host1x_bo_ops tegra_bo_ops = {
109 .get = tegra_bo_get,
110 .put = tegra_bo_put,
111 .pin = tegra_bo_pin,
112 .unpin = tegra_bo_unpin,
113 .mmap = tegra_bo_mmap,
114 .munmap = tegra_bo_munmap,
115 .kmap = tegra_bo_kmap,
116 .kunmap = tegra_bo_kunmap,
117};
118
119static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
120{
121 int prot = IOMMU_READ | IOMMU_WRITE;
122 ssize_t err;
123
124 if (bo->mm)
125 return -EBUSY;
126
127 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
128 if (!bo->mm)
129 return -ENOMEM;
130
131 err = drm_mm_insert_node_generic(&tegra->mm, bo->mm, bo->gem.size,
132 PAGE_SIZE, 0, 0, 0);
133 if (err < 0) {
134 dev_err(tegra->drm->dev, "out of I/O virtual memory: %zd\n",
135 err);
136 goto free;
137 }
138
139 bo->paddr = bo->mm->start;
140
141 err = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
142 bo->sgt->nents, prot);
143 if (err < 0) {
144 dev_err(tegra->drm->dev, "failed to map buffer: %zd\n", err);
145 goto remove;
146 }
147
148 bo->size = err;
149
150 return 0;
151
152remove:
153 drm_mm_remove_node(bo->mm);
154free:
155 kfree(bo->mm);
156 return err;
157}
158
159static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
160{
161 if (!bo->mm)
162 return 0;
163
164 iommu_unmap(tegra->domain, bo->paddr, bo->size);
165 drm_mm_remove_node(bo->mm);
166 kfree(bo->mm);
167
168 return 0;
169}
170
171static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
172 size_t size)
173{
174 struct tegra_bo *bo;
175 int err;
176
177 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
178 if (!bo)
179 return ERR_PTR(-ENOMEM);
180
181 host1x_bo_init(&bo->base, &tegra_bo_ops);
182 size = round_up(size, PAGE_SIZE);
183
184 err = drm_gem_object_init(drm, &bo->gem, size);
185 if (err < 0)
186 goto free;
187
188 err = drm_gem_create_mmap_offset(&bo->gem);
189 if (err < 0)
190 goto release;
191
192 return bo;
193
194release:
195 drm_gem_object_release(&bo->gem);
196free:
197 kfree(bo);
198 return ERR_PTR(err);
199}
200
201static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
202{
203 if (bo->pages) {
204 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
205 sg_free_table(bo->sgt);
206 kfree(bo->sgt);
207 } else if (bo->vaddr) {
208 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
209 }
210}
211
212static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
213{
214 struct scatterlist *s;
215 unsigned int i;
216
217 bo->pages = drm_gem_get_pages(&bo->gem);
218 if (IS_ERR(bo->pages))
219 return PTR_ERR(bo->pages);
220
221 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
222
223 bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
224 if (IS_ERR(bo->sgt))
225 goto put_pages;
226
227 /*
228 * Fake up the SG table so that dma_sync_sg_for_device() can be used
229 * to flush the pages associated with it.
230 *
231 * TODO: Replace this by drm_clflash_sg() once it can be implemented
232 * without relying on symbols that are not exported.
233 */
234 for_each_sg(bo->sgt->sgl, s, bo->sgt->nents, i)
235 sg_dma_address(s) = sg_phys(s);
236
237 dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
238 DMA_TO_DEVICE);
239
240 return 0;
241
242put_pages:
243 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
244 return PTR_ERR(bo->sgt);
245}
246
247static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
248{
249 struct tegra_drm *tegra = drm->dev_private;
250 int err;
251
252 if (tegra->domain) {
253 err = tegra_bo_get_pages(drm, bo);
254 if (err < 0)
255 return err;
256
257 err = tegra_bo_iommu_map(tegra, bo);
258 if (err < 0) {
259 tegra_bo_free(drm, bo);
260 return err;
261 }
262 } else {
263 size_t size = bo->gem.size;
264
265 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->paddr,
266 GFP_KERNEL | __GFP_NOWARN);
267 if (!bo->vaddr) {
268 dev_err(drm->dev,
269 "failed to allocate buffer of size %zu\n",
270 size);
271 return -ENOMEM;
272 }
273 }
274
275 return 0;
276}
277
278struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
279 unsigned long flags)
280{
281 struct tegra_bo *bo;
282 int err;
283
284 bo = tegra_bo_alloc_object(drm, size);
285 if (IS_ERR(bo))
286 return bo;
287
288 err = tegra_bo_alloc(drm, bo);
289 if (err < 0)
290 goto release;
291
292 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
293 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
294
295 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
296 bo->flags |= TEGRA_BO_BOTTOM_UP;
297
298 return bo;
299
300release:
301 drm_gem_object_release(&bo->gem);
302 kfree(bo);
303 return ERR_PTR(err);
304}
305
306struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
307 struct drm_device *drm,
308 size_t size,
309 unsigned long flags,
310 u32 *handle)
311{
312 struct tegra_bo *bo;
313 int err;
314
315 bo = tegra_bo_create(drm, size, flags);
316 if (IS_ERR(bo))
317 return bo;
318
319 err = drm_gem_handle_create(file, &bo->gem, handle);
320 if (err) {
321 tegra_bo_free_object(&bo->gem);
322 return ERR_PTR(err);
323 }
324
325 drm_gem_object_unreference_unlocked(&bo->gem);
326
327 return bo;
328}
329
330static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
331 struct dma_buf *buf)
332{
333 struct tegra_drm *tegra = drm->dev_private;
334 struct dma_buf_attachment *attach;
335 struct tegra_bo *bo;
336 int err;
337
338 bo = tegra_bo_alloc_object(drm, buf->size);
339 if (IS_ERR(bo))
340 return bo;
341
342 attach = dma_buf_attach(buf, drm->dev);
343 if (IS_ERR(attach)) {
344 err = PTR_ERR(attach);
345 goto free;
346 }
347
348 get_dma_buf(buf);
349
350 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
351 if (IS_ERR(bo->sgt)) {
352 err = PTR_ERR(bo->sgt);
353 goto detach;
354 }
355
356 if (tegra->domain) {
357 err = tegra_bo_iommu_map(tegra, bo);
358 if (err < 0)
359 goto detach;
360 } else {
361 if (bo->sgt->nents > 1) {
362 err = -EINVAL;
363 goto detach;
364 }
365
366 bo->paddr = sg_dma_address(bo->sgt->sgl);
367 }
368
369 bo->gem.import_attach = attach;
370
371 return bo;
372
373detach:
374 if (!IS_ERR_OR_NULL(bo->sgt))
375 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
376
377 dma_buf_detach(buf, attach);
378 dma_buf_put(buf);
379free:
380 drm_gem_object_release(&bo->gem);
381 kfree(bo);
382 return ERR_PTR(err);
383}
384
385void tegra_bo_free_object(struct drm_gem_object *gem)
386{
387 struct tegra_drm *tegra = gem->dev->dev_private;
388 struct tegra_bo *bo = to_tegra_bo(gem);
389
390 if (tegra->domain)
391 tegra_bo_iommu_unmap(tegra, bo);
392
393 if (gem->import_attach) {
394 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
395 DMA_TO_DEVICE);
396 drm_prime_gem_destroy(gem, NULL);
397 } else {
398 tegra_bo_free(gem->dev, bo);
399 }
400
401 drm_gem_object_release(gem);
402 kfree(bo);
403}
404
405int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
406 struct drm_mode_create_dumb *args)
407{
408 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
409 struct tegra_drm *tegra = drm->dev_private;
410 struct tegra_bo *bo;
411
412 args->pitch = round_up(min_pitch, tegra->pitch_align);
413 args->size = args->pitch * args->height;
414
415 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
416 &args->handle);
417 if (IS_ERR(bo))
418 return PTR_ERR(bo);
419
420 return 0;
421}
422
423int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
424 u32 handle, u64 *offset)
425{
426 struct drm_gem_object *gem;
427 struct tegra_bo *bo;
428
429 gem = drm_gem_object_lookup(file, handle);
430 if (!gem) {
431 dev_err(drm->dev, "failed to lookup GEM object\n");
432 return -EINVAL;
433 }
434
435 bo = to_tegra_bo(gem);
436
437 *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
438
439 drm_gem_object_unreference_unlocked(gem);
440
441 return 0;
442}
443
444static int tegra_bo_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
445{
446 struct drm_gem_object *gem = vma->vm_private_data;
447 struct tegra_bo *bo = to_tegra_bo(gem);
448 struct page *page;
449 pgoff_t offset;
450 int err;
451
452 if (!bo->pages)
453 return VM_FAULT_SIGBUS;
454
455 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
456 page = bo->pages[offset];
457
458 err = vm_insert_page(vma, vmf->address, page);
459 switch (err) {
460 case -EAGAIN:
461 case 0:
462 case -ERESTARTSYS:
463 case -EINTR:
464 case -EBUSY:
465 return VM_FAULT_NOPAGE;
466
467 case -ENOMEM:
468 return VM_FAULT_OOM;
469 }
470
471 return VM_FAULT_SIGBUS;
472}
473
474const struct vm_operations_struct tegra_bo_vm_ops = {
475 .fault = tegra_bo_fault,
476 .open = drm_gem_vm_open,
477 .close = drm_gem_vm_close,
478};
479
480int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
481{
482 struct drm_gem_object *gem;
483 struct tegra_bo *bo;
484 int ret;
485
486 ret = drm_gem_mmap(file, vma);
487 if (ret)
488 return ret;
489
490 gem = vma->vm_private_data;
491 bo = to_tegra_bo(gem);
492
493 if (!bo->pages) {
494 unsigned long vm_pgoff = vma->vm_pgoff;
495
496 vma->vm_flags &= ~VM_PFNMAP;
497 vma->vm_pgoff = 0;
498
499 ret = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr,
500 gem->size);
501 if (ret) {
502 drm_gem_vm_close(vma);
503 return ret;
504 }
505
506 vma->vm_pgoff = vm_pgoff;
507 } else {
508 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
509
510 vma->vm_flags |= VM_MIXEDMAP;
511 vma->vm_flags &= ~VM_PFNMAP;
512
513 vma->vm_page_prot = pgprot_writecombine(prot);
514 }
515
516 return 0;
517}
518
519static struct sg_table *
520tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
521 enum dma_data_direction dir)
522{
523 struct drm_gem_object *gem = attach->dmabuf->priv;
524 struct tegra_bo *bo = to_tegra_bo(gem);
525 struct sg_table *sgt;
526
527 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
528 if (!sgt)
529 return NULL;
530
531 if (bo->pages) {
532 struct scatterlist *sg;
533 unsigned int i;
534
535 if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
536 goto free;
537
538 for_each_sg(sgt->sgl, sg, bo->num_pages, i)
539 sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
540
541 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
542 goto free;
543 } else {
544 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
545 goto free;
546
547 sg_dma_address(sgt->sgl) = bo->paddr;
548 sg_dma_len(sgt->sgl) = gem->size;
549 }
550
551 return sgt;
552
553free:
554 sg_free_table(sgt);
555 kfree(sgt);
556 return NULL;
557}
558
559static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
560 struct sg_table *sgt,
561 enum dma_data_direction dir)
562{
563 struct drm_gem_object *gem = attach->dmabuf->priv;
564 struct tegra_bo *bo = to_tegra_bo(gem);
565
566 if (bo->pages)
567 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
568
569 sg_free_table(sgt);
570 kfree(sgt);
571}
572
573static void tegra_gem_prime_release(struct dma_buf *buf)
574{
575 drm_gem_dmabuf_release(buf);
576}
577
578static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
579 unsigned long page)
580{
581 return NULL;
582}
583
584static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
585 unsigned long page,
586 void *addr)
587{
588}
589
590static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
591{
592 return NULL;
593}
594
595static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
596 void *addr)
597{
598}
599
600static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
601{
602 return -EINVAL;
603}
604
605static void *tegra_gem_prime_vmap(struct dma_buf *buf)
606{
607 struct drm_gem_object *gem = buf->priv;
608 struct tegra_bo *bo = to_tegra_bo(gem);
609
610 return bo->vaddr;
611}
612
613static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
614{
615}
616
617static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
618 .map_dma_buf = tegra_gem_prime_map_dma_buf,
619 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
620 .release = tegra_gem_prime_release,
621 .kmap_atomic = tegra_gem_prime_kmap_atomic,
622 .kunmap_atomic = tegra_gem_prime_kunmap_atomic,
623 .kmap = tegra_gem_prime_kmap,
624 .kunmap = tegra_gem_prime_kunmap,
625 .mmap = tegra_gem_prime_mmap,
626 .vmap = tegra_gem_prime_vmap,
627 .vunmap = tegra_gem_prime_vunmap,
628};
629
630struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
631 struct drm_gem_object *gem,
632 int flags)
633{
634 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
635
636 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
637 exp_info.size = gem->size;
638 exp_info.flags = flags;
639 exp_info.priv = gem;
640
641 return drm_gem_dmabuf_export(drm, &exp_info);
642}
643
644struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
645 struct dma_buf *buf)
646{
647 struct tegra_bo *bo;
648
649 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
650 struct drm_gem_object *gem = buf->priv;
651
652 if (gem->dev == drm) {
653 drm_gem_object_reference(gem);
654 return gem;
655 }
656 }
657
658 bo = tegra_bo_import(drm, buf);
659 if (IS_ERR(bo))
660 return ERR_CAST(bo);
661
662 return &bo->gem;
663}