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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_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}