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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
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(&obj->gem);
28}
29
30/* XXX move this into lib/scatterlist.c? */
31static int sg_alloc_table_from_sg(struct sg_table *sgt, struct scatterlist *sg,
32 unsigned int nents, gfp_t gfp_mask)
33{
34 struct scatterlist *dst;
35 unsigned int i;
36 int err;
37
38 err = sg_alloc_table(sgt, nents, gfp_mask);
39 if (err < 0)
40 return err;
41
42 dst = sgt->sgl;
43
44 for (i = 0; i < nents; i++) {
45 sg_set_page(dst, sg_page(sg), sg->length, 0);
46 dst = sg_next(dst);
47 sg = sg_next(sg);
48 }
49
50 return 0;
51}
52
53static struct sg_table *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
54 dma_addr_t *phys)
55{
56 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
57 struct sg_table *sgt;
58 int err;
59
60 /*
61 * If we've manually mapped the buffer object through the IOMMU, make
62 * sure to return the IOVA address of our mapping.
63 *
64 * Similarly, for buffers that have been allocated by the DMA API the
65 * physical address can be used for devices that are not attached to
66 * an IOMMU. For these devices, callers must pass a valid pointer via
67 * the @phys argument.
68 *
69 * Imported buffers were also already mapped at import time, so the
70 * existing mapping can be reused.
71 */
72 if (phys) {
73 *phys = obj->iova;
74 return NULL;
75 }
76
77 /*
78 * If we don't have a mapping for this buffer yet, return an SG table
79 * so that host1x can do the mapping for us via the DMA API.
80 */
81 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
82 if (!sgt)
83 return ERR_PTR(-ENOMEM);
84
85 if (obj->pages) {
86 /*
87 * If the buffer object was allocated from the explicit IOMMU
88 * API code paths, construct an SG table from the pages.
89 */
90 err = sg_alloc_table_from_pages(sgt, obj->pages, obj->num_pages,
91 0, obj->gem.size, GFP_KERNEL);
92 if (err < 0)
93 goto free;
94 } else if (obj->sgt) {
95 /*
96 * If the buffer object already has an SG table but no pages
97 * were allocated for it, it means the buffer was imported and
98 * the SG table needs to be copied to avoid overwriting any
99 * other potential users of the original SG table.
100 */
101 err = sg_alloc_table_from_sg(sgt, obj->sgt->sgl, obj->sgt->nents,
102 GFP_KERNEL);
103 if (err < 0)
104 goto free;
105 } else {
106 /*
107 * If the buffer object had no pages allocated and if it was
108 * not imported, it had to be allocated with the DMA API, so
109 * the DMA API helper can be used.
110 */
111 err = dma_get_sgtable(dev, sgt, obj->vaddr, obj->iova,
112 obj->gem.size);
113 if (err < 0)
114 goto free;
115 }
116
117 return sgt;
118
119free:
120 kfree(sgt);
121 return ERR_PTR(err);
122}
123
124static void tegra_bo_unpin(struct device *dev, struct sg_table *sgt)
125{
126 if (sgt) {
127 sg_free_table(sgt);
128 kfree(sgt);
129 }
130}
131
132static void *tegra_bo_mmap(struct host1x_bo *bo)
133{
134 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
135
136 if (obj->vaddr)
137 return obj->vaddr;
138 else if (obj->gem.import_attach)
139 return dma_buf_vmap(obj->gem.import_attach->dmabuf);
140 else
141 return vmap(obj->pages, obj->num_pages, VM_MAP,
142 pgprot_writecombine(PAGE_KERNEL));
143}
144
145static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
146{
147 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
148
149 if (obj->vaddr)
150 return;
151 else if (obj->gem.import_attach)
152 dma_buf_vunmap(obj->gem.import_attach->dmabuf, addr);
153 else
154 vunmap(addr);
155}
156
157static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
158{
159 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
160
161 drm_gem_object_get(&obj->gem);
162
163 return bo;
164}
165
166static const struct host1x_bo_ops tegra_bo_ops = {
167 .get = tegra_bo_get,
168 .put = tegra_bo_put,
169 .pin = tegra_bo_pin,
170 .unpin = tegra_bo_unpin,
171 .mmap = tegra_bo_mmap,
172 .munmap = tegra_bo_munmap,
173};
174
175static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
176{
177 int prot = IOMMU_READ | IOMMU_WRITE;
178 int err;
179
180 if (bo->mm)
181 return -EBUSY;
182
183 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
184 if (!bo->mm)
185 return -ENOMEM;
186
187 mutex_lock(&tegra->mm_lock);
188
189 err = drm_mm_insert_node_generic(&tegra->mm,
190 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
191 if (err < 0) {
192 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
193 err);
194 goto unlock;
195 }
196
197 bo->iova = bo->mm->start;
198
199 bo->size = iommu_map_sg(tegra->domain, bo->iova, bo->sgt->sgl,
200 bo->sgt->nents, prot);
201 if (!bo->size) {
202 dev_err(tegra->drm->dev, "failed to map buffer\n");
203 err = -ENOMEM;
204 goto remove;
205 }
206
207 mutex_unlock(&tegra->mm_lock);
208
209 return 0;
210
211remove:
212 drm_mm_remove_node(bo->mm);
213unlock:
214 mutex_unlock(&tegra->mm_lock);
215 kfree(bo->mm);
216 return err;
217}
218
219static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
220{
221 if (!bo->mm)
222 return 0;
223
224 mutex_lock(&tegra->mm_lock);
225 iommu_unmap(tegra->domain, bo->iova, bo->size);
226 drm_mm_remove_node(bo->mm);
227 mutex_unlock(&tegra->mm_lock);
228
229 kfree(bo->mm);
230
231 return 0;
232}
233
234static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
235 size_t size)
236{
237 struct tegra_bo *bo;
238 int err;
239
240 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
241 if (!bo)
242 return ERR_PTR(-ENOMEM);
243
244 host1x_bo_init(&bo->base, &tegra_bo_ops);
245 size = round_up(size, PAGE_SIZE);
246
247 err = drm_gem_object_init(drm, &bo->gem, size);
248 if (err < 0)
249 goto free;
250
251 err = drm_gem_create_mmap_offset(&bo->gem);
252 if (err < 0)
253 goto release;
254
255 return bo;
256
257release:
258 drm_gem_object_release(&bo->gem);
259free:
260 kfree(bo);
261 return ERR_PTR(err);
262}
263
264static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
265{
266 if (bo->pages) {
267 dma_unmap_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
268 DMA_FROM_DEVICE);
269 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
270 sg_free_table(bo->sgt);
271 kfree(bo->sgt);
272 } else if (bo->vaddr) {
273 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
274 }
275}
276
277static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
278{
279 int err;
280
281 bo->pages = drm_gem_get_pages(&bo->gem);
282 if (IS_ERR(bo->pages))
283 return PTR_ERR(bo->pages);
284
285 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
286
287 bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
288 if (IS_ERR(bo->sgt)) {
289 err = PTR_ERR(bo->sgt);
290 goto put_pages;
291 }
292
293 err = dma_map_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
294 DMA_FROM_DEVICE);
295 if (err == 0) {
296 err = -EFAULT;
297 goto free_sgt;
298 }
299
300 return 0;
301
302free_sgt:
303 sg_free_table(bo->sgt);
304 kfree(bo->sgt);
305put_pages:
306 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
307 return err;
308}
309
310static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
311{
312 struct tegra_drm *tegra = drm->dev_private;
313 int err;
314
315 if (tegra->domain) {
316 err = tegra_bo_get_pages(drm, bo);
317 if (err < 0)
318 return err;
319
320 err = tegra_bo_iommu_map(tegra, bo);
321 if (err < 0) {
322 tegra_bo_free(drm, bo);
323 return err;
324 }
325 } else {
326 size_t size = bo->gem.size;
327
328 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
329 GFP_KERNEL | __GFP_NOWARN);
330 if (!bo->vaddr) {
331 dev_err(drm->dev,
332 "failed to allocate buffer of size %zu\n",
333 size);
334 return -ENOMEM;
335 }
336 }
337
338 return 0;
339}
340
341struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
342 unsigned long flags)
343{
344 struct tegra_bo *bo;
345 int err;
346
347 bo = tegra_bo_alloc_object(drm, size);
348 if (IS_ERR(bo))
349 return bo;
350
351 err = tegra_bo_alloc(drm, bo);
352 if (err < 0)
353 goto release;
354
355 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
356 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
357
358 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
359 bo->flags |= TEGRA_BO_BOTTOM_UP;
360
361 return bo;
362
363release:
364 drm_gem_object_release(&bo->gem);
365 kfree(bo);
366 return ERR_PTR(err);
367}
368
369struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
370 struct drm_device *drm,
371 size_t size,
372 unsigned long flags,
373 u32 *handle)
374{
375 struct tegra_bo *bo;
376 int err;
377
378 bo = tegra_bo_create(drm, size, flags);
379 if (IS_ERR(bo))
380 return bo;
381
382 err = drm_gem_handle_create(file, &bo->gem, handle);
383 if (err) {
384 tegra_bo_free_object(&bo->gem);
385 return ERR_PTR(err);
386 }
387
388 drm_gem_object_put(&bo->gem);
389
390 return bo;
391}
392
393static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
394 struct dma_buf *buf)
395{
396 struct tegra_drm *tegra = drm->dev_private;
397 struct dma_buf_attachment *attach;
398 struct tegra_bo *bo;
399 int err;
400
401 bo = tegra_bo_alloc_object(drm, buf->size);
402 if (IS_ERR(bo))
403 return bo;
404
405 attach = dma_buf_attach(buf, drm->dev);
406 if (IS_ERR(attach)) {
407 err = PTR_ERR(attach);
408 goto free;
409 }
410
411 get_dma_buf(buf);
412
413 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
414 if (IS_ERR(bo->sgt)) {
415 err = PTR_ERR(bo->sgt);
416 goto detach;
417 }
418
419 if (tegra->domain) {
420 err = tegra_bo_iommu_map(tegra, bo);
421 if (err < 0)
422 goto detach;
423 }
424
425 bo->gem.import_attach = attach;
426
427 return bo;
428
429detach:
430 if (!IS_ERR_OR_NULL(bo->sgt))
431 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
432
433 dma_buf_detach(buf, attach);
434 dma_buf_put(buf);
435free:
436 drm_gem_object_release(&bo->gem);
437 kfree(bo);
438 return ERR_PTR(err);
439}
440
441void tegra_bo_free_object(struct drm_gem_object *gem)
442{
443 struct tegra_drm *tegra = gem->dev->dev_private;
444 struct tegra_bo *bo = to_tegra_bo(gem);
445
446 if (tegra->domain)
447 tegra_bo_iommu_unmap(tegra, bo);
448
449 if (gem->import_attach) {
450 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
451 DMA_TO_DEVICE);
452 drm_prime_gem_destroy(gem, NULL);
453 } else {
454 tegra_bo_free(gem->dev, bo);
455 }
456
457 drm_gem_object_release(gem);
458 kfree(bo);
459}
460
461int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
462 struct drm_mode_create_dumb *args)
463{
464 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
465 struct tegra_drm *tegra = drm->dev_private;
466 struct tegra_bo *bo;
467
468 args->pitch = round_up(min_pitch, tegra->pitch_align);
469 args->size = args->pitch * args->height;
470
471 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
472 &args->handle);
473 if (IS_ERR(bo))
474 return PTR_ERR(bo);
475
476 return 0;
477}
478
479static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
480{
481 struct vm_area_struct *vma = vmf->vma;
482 struct drm_gem_object *gem = vma->vm_private_data;
483 struct tegra_bo *bo = to_tegra_bo(gem);
484 struct page *page;
485 pgoff_t offset;
486
487 if (!bo->pages)
488 return VM_FAULT_SIGBUS;
489
490 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
491 page = bo->pages[offset];
492
493 return vmf_insert_page(vma, vmf->address, page);
494}
495
496const struct vm_operations_struct tegra_bo_vm_ops = {
497 .fault = tegra_bo_fault,
498 .open = drm_gem_vm_open,
499 .close = drm_gem_vm_close,
500};
501
502int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
503{
504 struct tegra_bo *bo = to_tegra_bo(gem);
505
506 if (!bo->pages) {
507 unsigned long vm_pgoff = vma->vm_pgoff;
508 int err;
509
510 /*
511 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
512 * and set the vm_pgoff (used as a fake buffer offset by DRM)
513 * to 0 as we want to map the whole buffer.
514 */
515 vma->vm_flags &= ~VM_PFNMAP;
516 vma->vm_pgoff = 0;
517
518 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
519 gem->size);
520 if (err < 0) {
521 drm_gem_vm_close(vma);
522 return err;
523 }
524
525 vma->vm_pgoff = vm_pgoff;
526 } else {
527 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
528
529 vma->vm_flags |= VM_MIXEDMAP;
530 vma->vm_flags &= ~VM_PFNMAP;
531
532 vma->vm_page_prot = pgprot_writecombine(prot);
533 }
534
535 return 0;
536}
537
538int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
539{
540 struct drm_gem_object *gem;
541 int err;
542
543 err = drm_gem_mmap(file, vma);
544 if (err < 0)
545 return err;
546
547 gem = vma->vm_private_data;
548
549 return __tegra_gem_mmap(gem, vma);
550}
551
552static struct sg_table *
553tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
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 struct sg_table *sgt;
559
560 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
561 if (!sgt)
562 return NULL;
563
564 if (bo->pages) {
565 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
566 0, gem->size, GFP_KERNEL) < 0)
567 goto free;
568 } else {
569 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
570 gem->size) < 0)
571 goto free;
572 }
573
574 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
575 goto free;
576
577 return sgt;
578
579free:
580 sg_free_table(sgt);
581 kfree(sgt);
582 return NULL;
583}
584
585static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
586 struct sg_table *sgt,
587 enum dma_data_direction dir)
588{
589 struct drm_gem_object *gem = attach->dmabuf->priv;
590 struct tegra_bo *bo = to_tegra_bo(gem);
591
592 if (bo->pages)
593 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
594
595 sg_free_table(sgt);
596 kfree(sgt);
597}
598
599static void tegra_gem_prime_release(struct dma_buf *buf)
600{
601 drm_gem_dmabuf_release(buf);
602}
603
604static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
605 enum dma_data_direction direction)
606{
607 struct drm_gem_object *gem = buf->priv;
608 struct tegra_bo *bo = to_tegra_bo(gem);
609 struct drm_device *drm = gem->dev;
610
611 if (bo->pages)
612 dma_sync_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents,
613 DMA_FROM_DEVICE);
614
615 return 0;
616}
617
618static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
619 enum dma_data_direction direction)
620{
621 struct drm_gem_object *gem = buf->priv;
622 struct tegra_bo *bo = to_tegra_bo(gem);
623 struct drm_device *drm = gem->dev;
624
625 if (bo->pages)
626 dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
627 DMA_TO_DEVICE);
628
629 return 0;
630}
631
632static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
633{
634 struct drm_gem_object *gem = buf->priv;
635 int err;
636
637 err = drm_gem_mmap_obj(gem, gem->size, vma);
638 if (err < 0)
639 return err;
640
641 return __tegra_gem_mmap(gem, vma);
642}
643
644static void *tegra_gem_prime_vmap(struct dma_buf *buf)
645{
646 struct drm_gem_object *gem = buf->priv;
647 struct tegra_bo *bo = to_tegra_bo(gem);
648
649 return bo->vaddr;
650}
651
652static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
653{
654}
655
656static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
657 .map_dma_buf = tegra_gem_prime_map_dma_buf,
658 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
659 .release = tegra_gem_prime_release,
660 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
661 .end_cpu_access = tegra_gem_prime_end_cpu_access,
662 .mmap = tegra_gem_prime_mmap,
663 .vmap = tegra_gem_prime_vmap,
664 .vunmap = tegra_gem_prime_vunmap,
665};
666
667struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
668 int flags)
669{
670 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
671
672 exp_info.exp_name = KBUILD_MODNAME;
673 exp_info.owner = gem->dev->driver->fops->owner;
674 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
675 exp_info.size = gem->size;
676 exp_info.flags = flags;
677 exp_info.priv = gem;
678
679 return drm_gem_dmabuf_export(gem->dev, &exp_info);
680}
681
682struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
683 struct dma_buf *buf)
684{
685 struct tegra_bo *bo;
686
687 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
688 struct drm_gem_object *gem = buf->priv;
689
690 if (gem->dev == drm) {
691 drm_gem_object_get(gem);
692 return gem;
693 }
694 }
695
696 bo = tegra_bo_import(drm, buf);
697 if (IS_ERR(bo))
698 return ERR_CAST(bo);
699
700 return &bo->gem;
701}
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
17#include <drm/drm_drv.h>
18#include <drm/drm_prime.h>
19#include <drm/tegra_drm.h>
20
21#include "drm.h"
22#include "gem.h"
23
24MODULE_IMPORT_NS(DMA_BUF);
25
26static unsigned int sg_dma_count_chunks(struct scatterlist *sgl, unsigned int nents)
27{
28 dma_addr_t next = ~(dma_addr_t)0;
29 unsigned int count = 0, i;
30 struct scatterlist *s;
31
32 for_each_sg(sgl, s, nents, i) {
33 /* sg_dma_address(s) is only valid for entries that have sg_dma_len(s) != 0. */
34 if (!sg_dma_len(s))
35 continue;
36
37 if (sg_dma_address(s) != next) {
38 next = sg_dma_address(s) + sg_dma_len(s);
39 count++;
40 }
41 }
42
43 return count;
44}
45
46static inline unsigned int sgt_dma_count_chunks(struct sg_table *sgt)
47{
48 return sg_dma_count_chunks(sgt->sgl, sgt->nents);
49}
50
51static void tegra_bo_put(struct host1x_bo *bo)
52{
53 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
54
55 drm_gem_object_put(&obj->gem);
56}
57
58static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
59 enum dma_data_direction direction)
60{
61 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
62 struct drm_gem_object *gem = &obj->gem;
63 struct host1x_bo_mapping *map;
64 int err;
65
66 map = kzalloc(sizeof(*map), GFP_KERNEL);
67 if (!map)
68 return ERR_PTR(-ENOMEM);
69
70 kref_init(&map->ref);
71 map->bo = host1x_bo_get(bo);
72 map->direction = direction;
73 map->dev = dev;
74
75 /*
76 * Imported buffers need special treatment to satisfy the semantics of DMA-BUF.
77 */
78 if (gem->import_attach) {
79 struct dma_buf *buf = gem->import_attach->dmabuf;
80
81 map->attach = dma_buf_attach(buf, dev);
82 if (IS_ERR(map->attach)) {
83 err = PTR_ERR(map->attach);
84 goto free;
85 }
86
87 map->sgt = dma_buf_map_attachment_unlocked(map->attach, direction);
88 if (IS_ERR(map->sgt)) {
89 dma_buf_detach(buf, map->attach);
90 err = PTR_ERR(map->sgt);
91 map->sgt = NULL;
92 goto free;
93 }
94
95 err = sgt_dma_count_chunks(map->sgt);
96 map->size = gem->size;
97
98 goto out;
99 }
100
101 /*
102 * If we don't have a mapping for this buffer yet, return an SG table
103 * so that host1x can do the mapping for us via the DMA API.
104 */
105 map->sgt = kzalloc(sizeof(*map->sgt), GFP_KERNEL);
106 if (!map->sgt) {
107 err = -ENOMEM;
108 goto free;
109 }
110
111 if (obj->pages) {
112 /*
113 * If the buffer object was allocated from the explicit IOMMU
114 * API code paths, construct an SG table from the pages.
115 */
116 err = sg_alloc_table_from_pages(map->sgt, obj->pages, obj->num_pages, 0, gem->size,
117 GFP_KERNEL);
118 if (err < 0)
119 goto free;
120 } else {
121 /*
122 * If the buffer object had no pages allocated and if it was
123 * not imported, it had to be allocated with the DMA API, so
124 * the DMA API helper can be used.
125 */
126 err = dma_get_sgtable(dev, map->sgt, obj->vaddr, obj->iova, gem->size);
127 if (err < 0)
128 goto free;
129 }
130
131 err = dma_map_sgtable(dev, map->sgt, direction, 0);
132 if (err)
133 goto free_sgt;
134
135out:
136 /*
137 * If we've manually mapped the buffer object through the IOMMU, make sure to return the
138 * existing IOVA address of our mapping.
139 */
140 if (!obj->mm) {
141 map->phys = sg_dma_address(map->sgt->sgl);
142 map->chunks = err;
143 } else {
144 map->phys = obj->iova;
145 map->chunks = 1;
146 }
147
148 map->size = gem->size;
149
150 return map;
151
152free_sgt:
153 sg_free_table(map->sgt);
154free:
155 kfree(map->sgt);
156 kfree(map);
157 return ERR_PTR(err);
158}
159
160static void tegra_bo_unpin(struct host1x_bo_mapping *map)
161{
162 if (map->attach) {
163 dma_buf_unmap_attachment_unlocked(map->attach, map->sgt,
164 map->direction);
165 dma_buf_detach(map->attach->dmabuf, map->attach);
166 } else {
167 dma_unmap_sgtable(map->dev, map->sgt, map->direction, 0);
168 sg_free_table(map->sgt);
169 kfree(map->sgt);
170 }
171
172 host1x_bo_put(map->bo);
173 kfree(map);
174}
175
176static void *tegra_bo_mmap(struct host1x_bo *bo)
177{
178 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
179 struct iosys_map map;
180 int ret;
181
182 if (obj->vaddr) {
183 return obj->vaddr;
184 } else if (obj->gem.import_attach) {
185 ret = dma_buf_vmap_unlocked(obj->gem.import_attach->dmabuf, &map);
186 return ret ? NULL : map.vaddr;
187 } else {
188 return vmap(obj->pages, obj->num_pages, VM_MAP,
189 pgprot_writecombine(PAGE_KERNEL));
190 }
191}
192
193static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
194{
195 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
196 struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr);
197
198 if (obj->vaddr)
199 return;
200 else if (obj->gem.import_attach)
201 dma_buf_vunmap_unlocked(obj->gem.import_attach->dmabuf, &map);
202 else
203 vunmap(addr);
204}
205
206static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
207{
208 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
209
210 drm_gem_object_get(&obj->gem);
211
212 return bo;
213}
214
215static const struct host1x_bo_ops tegra_bo_ops = {
216 .get = tegra_bo_get,
217 .put = tegra_bo_put,
218 .pin = tegra_bo_pin,
219 .unpin = tegra_bo_unpin,
220 .mmap = tegra_bo_mmap,
221 .munmap = tegra_bo_munmap,
222};
223
224static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
225{
226 int prot = IOMMU_READ | IOMMU_WRITE;
227 int err;
228
229 if (bo->mm)
230 return -EBUSY;
231
232 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
233 if (!bo->mm)
234 return -ENOMEM;
235
236 mutex_lock(&tegra->mm_lock);
237
238 err = drm_mm_insert_node_generic(&tegra->mm,
239 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
240 if (err < 0) {
241 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
242 err);
243 goto unlock;
244 }
245
246 bo->iova = bo->mm->start;
247
248 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
249 if (!bo->size) {
250 dev_err(tegra->drm->dev, "failed to map buffer\n");
251 err = -ENOMEM;
252 goto remove;
253 }
254
255 mutex_unlock(&tegra->mm_lock);
256
257 return 0;
258
259remove:
260 drm_mm_remove_node(bo->mm);
261unlock:
262 mutex_unlock(&tegra->mm_lock);
263 kfree(bo->mm);
264 return err;
265}
266
267static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
268{
269 if (!bo->mm)
270 return 0;
271
272 mutex_lock(&tegra->mm_lock);
273 iommu_unmap(tegra->domain, bo->iova, bo->size);
274 drm_mm_remove_node(bo->mm);
275 mutex_unlock(&tegra->mm_lock);
276
277 kfree(bo->mm);
278
279 return 0;
280}
281
282static const struct drm_gem_object_funcs tegra_gem_object_funcs = {
283 .free = tegra_bo_free_object,
284 .export = tegra_gem_prime_export,
285 .vm_ops = &tegra_bo_vm_ops,
286};
287
288static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
289 size_t size)
290{
291 struct tegra_bo *bo;
292 int err;
293
294 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
295 if (!bo)
296 return ERR_PTR(-ENOMEM);
297
298 bo->gem.funcs = &tegra_gem_object_funcs;
299
300 host1x_bo_init(&bo->base, &tegra_bo_ops);
301 size = round_up(size, PAGE_SIZE);
302
303 err = drm_gem_object_init(drm, &bo->gem, size);
304 if (err < 0)
305 goto free;
306
307 err = drm_gem_create_mmap_offset(&bo->gem);
308 if (err < 0)
309 goto release;
310
311 return bo;
312
313release:
314 drm_gem_object_release(&bo->gem);
315free:
316 kfree(bo);
317 return ERR_PTR(err);
318}
319
320static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
321{
322 if (bo->pages) {
323 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
324 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
325 sg_free_table(bo->sgt);
326 kfree(bo->sgt);
327 } else if (bo->vaddr) {
328 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
329 }
330}
331
332static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
333{
334 int err;
335
336 bo->pages = drm_gem_get_pages(&bo->gem);
337 if (IS_ERR(bo->pages))
338 return PTR_ERR(bo->pages);
339
340 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
341
342 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages);
343 if (IS_ERR(bo->sgt)) {
344 err = PTR_ERR(bo->sgt);
345 goto put_pages;
346 }
347
348 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
349 if (err)
350 goto free_sgt;
351
352 return 0;
353
354free_sgt:
355 sg_free_table(bo->sgt);
356 kfree(bo->sgt);
357put_pages:
358 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
359 return err;
360}
361
362static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
363{
364 struct tegra_drm *tegra = drm->dev_private;
365 int err;
366
367 if (tegra->domain) {
368 err = tegra_bo_get_pages(drm, bo);
369 if (err < 0)
370 return err;
371
372 err = tegra_bo_iommu_map(tegra, bo);
373 if (err < 0) {
374 tegra_bo_free(drm, bo);
375 return err;
376 }
377 } else {
378 size_t size = bo->gem.size;
379
380 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
381 GFP_KERNEL | __GFP_NOWARN);
382 if (!bo->vaddr) {
383 dev_err(drm->dev,
384 "failed to allocate buffer of size %zu\n",
385 size);
386 return -ENOMEM;
387 }
388 }
389
390 return 0;
391}
392
393struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
394 unsigned long flags)
395{
396 struct tegra_bo *bo;
397 int err;
398
399 bo = tegra_bo_alloc_object(drm, size);
400 if (IS_ERR(bo))
401 return bo;
402
403 err = tegra_bo_alloc(drm, bo);
404 if (err < 0)
405 goto release;
406
407 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
408 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
409
410 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
411 bo->flags |= TEGRA_BO_BOTTOM_UP;
412
413 return bo;
414
415release:
416 drm_gem_object_release(&bo->gem);
417 kfree(bo);
418 return ERR_PTR(err);
419}
420
421struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
422 struct drm_device *drm,
423 size_t size,
424 unsigned long flags,
425 u32 *handle)
426{
427 struct tegra_bo *bo;
428 int err;
429
430 bo = tegra_bo_create(drm, size, flags);
431 if (IS_ERR(bo))
432 return bo;
433
434 err = drm_gem_handle_create(file, &bo->gem, handle);
435 if (err) {
436 tegra_bo_free_object(&bo->gem);
437 return ERR_PTR(err);
438 }
439
440 drm_gem_object_put(&bo->gem);
441
442 return bo;
443}
444
445static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
446 struct dma_buf *buf)
447{
448 struct tegra_drm *tegra = drm->dev_private;
449 struct dma_buf_attachment *attach;
450 struct tegra_bo *bo;
451 int err;
452
453 bo = tegra_bo_alloc_object(drm, buf->size);
454 if (IS_ERR(bo))
455 return bo;
456
457 attach = dma_buf_attach(buf, drm->dev);
458 if (IS_ERR(attach)) {
459 err = PTR_ERR(attach);
460 goto free;
461 }
462
463 get_dma_buf(buf);
464
465 bo->sgt = dma_buf_map_attachment_unlocked(attach, DMA_TO_DEVICE);
466 if (IS_ERR(bo->sgt)) {
467 err = PTR_ERR(bo->sgt);
468 goto detach;
469 }
470
471 if (tegra->domain) {
472 err = tegra_bo_iommu_map(tegra, bo);
473 if (err < 0)
474 goto detach;
475 }
476
477 bo->gem.import_attach = attach;
478
479 return bo;
480
481detach:
482 if (!IS_ERR_OR_NULL(bo->sgt))
483 dma_buf_unmap_attachment_unlocked(attach, bo->sgt, DMA_TO_DEVICE);
484
485 dma_buf_detach(buf, attach);
486 dma_buf_put(buf);
487free:
488 drm_gem_object_release(&bo->gem);
489 kfree(bo);
490 return ERR_PTR(err);
491}
492
493void tegra_bo_free_object(struct drm_gem_object *gem)
494{
495 struct tegra_drm *tegra = gem->dev->dev_private;
496 struct host1x_bo_mapping *mapping, *tmp;
497 struct tegra_bo *bo = to_tegra_bo(gem);
498
499 /* remove all mappings of this buffer object from any caches */
500 list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) {
501 if (mapping->cache)
502 host1x_bo_unpin(mapping);
503 else
504 dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping,
505 dev_name(mapping->dev));
506 }
507
508 if (tegra->domain)
509 tegra_bo_iommu_unmap(tegra, bo);
510
511 if (gem->import_attach) {
512 dma_buf_unmap_attachment_unlocked(gem->import_attach, bo->sgt,
513 DMA_TO_DEVICE);
514 drm_prime_gem_destroy(gem, NULL);
515 } else {
516 tegra_bo_free(gem->dev, bo);
517 }
518
519 drm_gem_object_release(gem);
520 kfree(bo);
521}
522
523int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
524 struct drm_mode_create_dumb *args)
525{
526 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
527 struct tegra_drm *tegra = drm->dev_private;
528 struct tegra_bo *bo;
529
530 args->pitch = round_up(min_pitch, tegra->pitch_align);
531 args->size = args->pitch * args->height;
532
533 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
534 &args->handle);
535 if (IS_ERR(bo))
536 return PTR_ERR(bo);
537
538 return 0;
539}
540
541static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
542{
543 struct vm_area_struct *vma = vmf->vma;
544 struct drm_gem_object *gem = vma->vm_private_data;
545 struct tegra_bo *bo = to_tegra_bo(gem);
546 struct page *page;
547 pgoff_t offset;
548
549 if (!bo->pages)
550 return VM_FAULT_SIGBUS;
551
552 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
553 page = bo->pages[offset];
554
555 return vmf_insert_page(vma, vmf->address, page);
556}
557
558const struct vm_operations_struct tegra_bo_vm_ops = {
559 .fault = tegra_bo_fault,
560 .open = drm_gem_vm_open,
561 .close = drm_gem_vm_close,
562};
563
564int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
565{
566 struct tegra_bo *bo = to_tegra_bo(gem);
567
568 if (!bo->pages) {
569 unsigned long vm_pgoff = vma->vm_pgoff;
570 int err;
571
572 /*
573 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
574 * and set the vm_pgoff (used as a fake buffer offset by DRM)
575 * to 0 as we want to map the whole buffer.
576 */
577 vma->vm_flags &= ~VM_PFNMAP;
578 vma->vm_pgoff = 0;
579
580 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
581 gem->size);
582 if (err < 0) {
583 drm_gem_vm_close(vma);
584 return err;
585 }
586
587 vma->vm_pgoff = vm_pgoff;
588 } else {
589 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
590
591 vma->vm_flags |= VM_MIXEDMAP;
592 vma->vm_flags &= ~VM_PFNMAP;
593
594 vma->vm_page_prot = pgprot_writecombine(prot);
595 }
596
597 return 0;
598}
599
600int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
601{
602 struct drm_gem_object *gem;
603 int err;
604
605 err = drm_gem_mmap(file, vma);
606 if (err < 0)
607 return err;
608
609 gem = vma->vm_private_data;
610
611 return __tegra_gem_mmap(gem, vma);
612}
613
614static struct sg_table *
615tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
616 enum dma_data_direction dir)
617{
618 struct drm_gem_object *gem = attach->dmabuf->priv;
619 struct tegra_bo *bo = to_tegra_bo(gem);
620 struct sg_table *sgt;
621
622 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
623 if (!sgt)
624 return NULL;
625
626 if (bo->pages) {
627 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
628 0, gem->size, GFP_KERNEL) < 0)
629 goto free;
630 } else {
631 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
632 gem->size) < 0)
633 goto free;
634 }
635
636 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
637 goto free;
638
639 return sgt;
640
641free:
642 sg_free_table(sgt);
643 kfree(sgt);
644 return NULL;
645}
646
647static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
648 struct sg_table *sgt,
649 enum dma_data_direction dir)
650{
651 struct drm_gem_object *gem = attach->dmabuf->priv;
652 struct tegra_bo *bo = to_tegra_bo(gem);
653
654 if (bo->pages)
655 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
656
657 sg_free_table(sgt);
658 kfree(sgt);
659}
660
661static void tegra_gem_prime_release(struct dma_buf *buf)
662{
663 drm_gem_dmabuf_release(buf);
664}
665
666static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
667 enum dma_data_direction direction)
668{
669 struct drm_gem_object *gem = buf->priv;
670 struct tegra_bo *bo = to_tegra_bo(gem);
671 struct drm_device *drm = gem->dev;
672
673 if (bo->pages)
674 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
675
676 return 0;
677}
678
679static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
680 enum dma_data_direction direction)
681{
682 struct drm_gem_object *gem = buf->priv;
683 struct tegra_bo *bo = to_tegra_bo(gem);
684 struct drm_device *drm = gem->dev;
685
686 if (bo->pages)
687 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
688
689 return 0;
690}
691
692static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
693{
694 struct drm_gem_object *gem = buf->priv;
695 int err;
696
697 dma_resv_assert_held(buf->resv);
698
699 err = drm_gem_mmap_obj(gem, gem->size, vma);
700 if (err < 0)
701 return err;
702
703 return __tegra_gem_mmap(gem, vma);
704}
705
706static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map)
707{
708 struct drm_gem_object *gem = buf->priv;
709 struct tegra_bo *bo = to_tegra_bo(gem);
710 void *vaddr;
711
712 vaddr = tegra_bo_mmap(&bo->base);
713 if (IS_ERR(vaddr))
714 return PTR_ERR(vaddr);
715
716 iosys_map_set_vaddr(map, vaddr);
717
718 return 0;
719}
720
721static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map)
722{
723 struct drm_gem_object *gem = buf->priv;
724 struct tegra_bo *bo = to_tegra_bo(gem);
725
726 tegra_bo_munmap(&bo->base, map->vaddr);
727}
728
729static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
730 .map_dma_buf = tegra_gem_prime_map_dma_buf,
731 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
732 .release = tegra_gem_prime_release,
733 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
734 .end_cpu_access = tegra_gem_prime_end_cpu_access,
735 .mmap = tegra_gem_prime_mmap,
736 .vmap = tegra_gem_prime_vmap,
737 .vunmap = tegra_gem_prime_vunmap,
738};
739
740struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
741 int flags)
742{
743 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
744
745 exp_info.exp_name = KBUILD_MODNAME;
746 exp_info.owner = gem->dev->driver->fops->owner;
747 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
748 exp_info.size = gem->size;
749 exp_info.flags = flags;
750 exp_info.priv = gem;
751
752 return drm_gem_dmabuf_export(gem->dev, &exp_info);
753}
754
755struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
756 struct dma_buf *buf)
757{
758 struct tegra_bo *bo;
759
760 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
761 struct drm_gem_object *gem = buf->priv;
762
763 if (gem->dev == drm) {
764 drm_gem_object_get(gem);
765 return gem;
766 }
767 }
768
769 bo = tegra_bo_import(drm, buf);
770 if (IS_ERR(bo))
771 return ERR_CAST(bo);
772
773 return &bo->gem;
774}
775
776struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle)
777{
778 struct drm_gem_object *gem;
779 struct tegra_bo *bo;
780
781 gem = drm_gem_object_lookup(file, handle);
782 if (!gem)
783 return NULL;
784
785 bo = to_tegra_bo(gem);
786 return &bo->base;
787}