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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}
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
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_FROM_DEVICE);
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_FROM_DEVICE);
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 vm_fault_t 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
433 if (!bo->pages)
434 return VM_FAULT_SIGBUS;
435
436 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
437 page = bo->pages[offset];
438
439 return vmf_insert_page(vma, vmf->address, page);
440}
441
442const struct vm_operations_struct tegra_bo_vm_ops = {
443 .fault = tegra_bo_fault,
444 .open = drm_gem_vm_open,
445 .close = drm_gem_vm_close,
446};
447
448int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
449{
450 struct tegra_bo *bo = to_tegra_bo(gem);
451
452 if (!bo->pages) {
453 unsigned long vm_pgoff = vma->vm_pgoff;
454 int err;
455
456 /*
457 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
458 * and set the vm_pgoff (used as a fake buffer offset by DRM)
459 * to 0 as we want to map the whole buffer.
460 */
461 vma->vm_flags &= ~VM_PFNMAP;
462 vma->vm_pgoff = 0;
463
464 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr,
465 gem->size);
466 if (err < 0) {
467 drm_gem_vm_close(vma);
468 return err;
469 }
470
471 vma->vm_pgoff = vm_pgoff;
472 } else {
473 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
474
475 vma->vm_flags |= VM_MIXEDMAP;
476 vma->vm_flags &= ~VM_PFNMAP;
477
478 vma->vm_page_prot = pgprot_writecombine(prot);
479 }
480
481 return 0;
482}
483
484int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
485{
486 struct drm_gem_object *gem;
487 int err;
488
489 err = drm_gem_mmap(file, vma);
490 if (err < 0)
491 return err;
492
493 gem = vma->vm_private_data;
494
495 return __tegra_gem_mmap(gem, vma);
496}
497
498static struct sg_table *
499tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
500 enum dma_data_direction dir)
501{
502 struct drm_gem_object *gem = attach->dmabuf->priv;
503 struct tegra_bo *bo = to_tegra_bo(gem);
504 struct sg_table *sgt;
505
506 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
507 if (!sgt)
508 return NULL;
509
510 if (bo->pages) {
511 struct scatterlist *sg;
512 unsigned int i;
513
514 if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
515 goto free;
516
517 for_each_sg(sgt->sgl, sg, bo->num_pages, i)
518 sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
519
520 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
521 goto free;
522 } else {
523 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
524 goto free;
525
526 sg_dma_address(sgt->sgl) = bo->paddr;
527 sg_dma_len(sgt->sgl) = gem->size;
528 }
529
530 return sgt;
531
532free:
533 sg_free_table(sgt);
534 kfree(sgt);
535 return NULL;
536}
537
538static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
539 struct sg_table *sgt,
540 enum dma_data_direction dir)
541{
542 struct drm_gem_object *gem = attach->dmabuf->priv;
543 struct tegra_bo *bo = to_tegra_bo(gem);
544
545 if (bo->pages)
546 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
547
548 sg_free_table(sgt);
549 kfree(sgt);
550}
551
552static void tegra_gem_prime_release(struct dma_buf *buf)
553{
554 drm_gem_dmabuf_release(buf);
555}
556
557static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
558 enum dma_data_direction direction)
559{
560 struct drm_gem_object *gem = buf->priv;
561 struct tegra_bo *bo = to_tegra_bo(gem);
562 struct drm_device *drm = gem->dev;
563
564 if (bo->pages)
565 dma_sync_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents,
566 DMA_FROM_DEVICE);
567
568 return 0;
569}
570
571static int tegra_gem_prime_end_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_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
580 DMA_TO_DEVICE);
581
582 return 0;
583}
584
585static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
586{
587 return NULL;
588}
589
590static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
591 void *addr)
592{
593}
594
595static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
596{
597 struct drm_gem_object *gem = buf->priv;
598 int err;
599
600 err = drm_gem_mmap_obj(gem, gem->size, vma);
601 if (err < 0)
602 return err;
603
604 return __tegra_gem_mmap(gem, vma);
605}
606
607static void *tegra_gem_prime_vmap(struct dma_buf *buf)
608{
609 struct drm_gem_object *gem = buf->priv;
610 struct tegra_bo *bo = to_tegra_bo(gem);
611
612 return bo->vaddr;
613}
614
615static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
616{
617}
618
619static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
620 .map_dma_buf = tegra_gem_prime_map_dma_buf,
621 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
622 .release = tegra_gem_prime_release,
623 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
624 .end_cpu_access = tegra_gem_prime_end_cpu_access,
625 .map = tegra_gem_prime_kmap,
626 .unmap = tegra_gem_prime_kunmap,
627 .mmap = tegra_gem_prime_mmap,
628 .vmap = tegra_gem_prime_vmap,
629 .vunmap = tegra_gem_prime_vunmap,
630};
631
632struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
633 int flags)
634{
635 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
636
637 exp_info.exp_name = KBUILD_MODNAME;
638 exp_info.owner = gem->dev->driver->fops->owner;
639 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
640 exp_info.size = gem->size;
641 exp_info.flags = flags;
642 exp_info.priv = gem;
643
644 return drm_gem_dmabuf_export(gem->dev, &exp_info);
645}
646
647struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
648 struct dma_buf *buf)
649{
650 struct tegra_bo *bo;
651
652 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
653 struct drm_gem_object *gem = buf->priv;
654
655 if (gem->dev == drm) {
656 drm_gem_object_get(gem);
657 return gem;
658 }
659 }
660
661 bo = tegra_bo_import(drm, buf);
662 if (IS_ERR(bo))
663 return ERR_CAST(bo);
664
665 return &bo->gem;
666}