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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 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}