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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,
102 obj->sgt->orig_nents, 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 struct dma_buf_map map;
136 int ret;
137
138 if (obj->vaddr) {
139 return obj->vaddr;
140 } else if (obj->gem.import_attach) {
141 ret = dma_buf_vmap(obj->gem.import_attach->dmabuf, &map);
142 return ret ? NULL : map.vaddr;
143 } else {
144 return vmap(obj->pages, obj->num_pages, VM_MAP,
145 pgprot_writecombine(PAGE_KERNEL));
146 }
147}
148
149static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
150{
151 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
152 struct dma_buf_map map = DMA_BUF_MAP_INIT_VADDR(addr);
153
154 if (obj->vaddr)
155 return;
156 else if (obj->gem.import_attach)
157 dma_buf_vunmap(obj->gem.import_attach->dmabuf, &map);
158 else
159 vunmap(addr);
160}
161
162static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
163{
164 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
165
166 drm_gem_object_get(&obj->gem);
167
168 return bo;
169}
170
171static const struct host1x_bo_ops tegra_bo_ops = {
172 .get = tegra_bo_get,
173 .put = tegra_bo_put,
174 .pin = tegra_bo_pin,
175 .unpin = tegra_bo_unpin,
176 .mmap = tegra_bo_mmap,
177 .munmap = tegra_bo_munmap,
178};
179
180static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
181{
182 int prot = IOMMU_READ | IOMMU_WRITE;
183 int err;
184
185 if (bo->mm)
186 return -EBUSY;
187
188 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
189 if (!bo->mm)
190 return -ENOMEM;
191
192 mutex_lock(&tegra->mm_lock);
193
194 err = drm_mm_insert_node_generic(&tegra->mm,
195 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
196 if (err < 0) {
197 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
198 err);
199 goto unlock;
200 }
201
202 bo->iova = bo->mm->start;
203
204 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
205 if (!bo->size) {
206 dev_err(tegra->drm->dev, "failed to map buffer\n");
207 err = -ENOMEM;
208 goto remove;
209 }
210
211 mutex_unlock(&tegra->mm_lock);
212
213 return 0;
214
215remove:
216 drm_mm_remove_node(bo->mm);
217unlock:
218 mutex_unlock(&tegra->mm_lock);
219 kfree(bo->mm);
220 return err;
221}
222
223static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
224{
225 if (!bo->mm)
226 return 0;
227
228 mutex_lock(&tegra->mm_lock);
229 iommu_unmap(tegra->domain, bo->iova, bo->size);
230 drm_mm_remove_node(bo->mm);
231 mutex_unlock(&tegra->mm_lock);
232
233 kfree(bo->mm);
234
235 return 0;
236}
237
238static const struct drm_gem_object_funcs tegra_gem_object_funcs = {
239 .free = tegra_bo_free_object,
240 .export = tegra_gem_prime_export,
241 .vm_ops = &tegra_bo_vm_ops,
242};
243
244static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
245 size_t size)
246{
247 struct tegra_bo *bo;
248 int err;
249
250 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
251 if (!bo)
252 return ERR_PTR(-ENOMEM);
253
254 bo->gem.funcs = &tegra_gem_object_funcs;
255
256 host1x_bo_init(&bo->base, &tegra_bo_ops);
257 size = round_up(size, PAGE_SIZE);
258
259 err = drm_gem_object_init(drm, &bo->gem, size);
260 if (err < 0)
261 goto free;
262
263 err = drm_gem_create_mmap_offset(&bo->gem);
264 if (err < 0)
265 goto release;
266
267 return bo;
268
269release:
270 drm_gem_object_release(&bo->gem);
271free:
272 kfree(bo);
273 return ERR_PTR(err);
274}
275
276static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
277{
278 if (bo->pages) {
279 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
280 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
281 sg_free_table(bo->sgt);
282 kfree(bo->sgt);
283 } else if (bo->vaddr) {
284 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
285 }
286}
287
288static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
289{
290 int err;
291
292 bo->pages = drm_gem_get_pages(&bo->gem);
293 if (IS_ERR(bo->pages))
294 return PTR_ERR(bo->pages);
295
296 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
297
298 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages);
299 if (IS_ERR(bo->sgt)) {
300 err = PTR_ERR(bo->sgt);
301 goto put_pages;
302 }
303
304 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
305 if (err)
306 goto free_sgt;
307
308 return 0;
309
310free_sgt:
311 sg_free_table(bo->sgt);
312 kfree(bo->sgt);
313put_pages:
314 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
315 return err;
316}
317
318static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
319{
320 struct tegra_drm *tegra = drm->dev_private;
321 int err;
322
323 if (tegra->domain) {
324 err = tegra_bo_get_pages(drm, bo);
325 if (err < 0)
326 return err;
327
328 err = tegra_bo_iommu_map(tegra, bo);
329 if (err < 0) {
330 tegra_bo_free(drm, bo);
331 return err;
332 }
333 } else {
334 size_t size = bo->gem.size;
335
336 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
337 GFP_KERNEL | __GFP_NOWARN);
338 if (!bo->vaddr) {
339 dev_err(drm->dev,
340 "failed to allocate buffer of size %zu\n",
341 size);
342 return -ENOMEM;
343 }
344 }
345
346 return 0;
347}
348
349struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
350 unsigned long flags)
351{
352 struct tegra_bo *bo;
353 int err;
354
355 bo = tegra_bo_alloc_object(drm, size);
356 if (IS_ERR(bo))
357 return bo;
358
359 err = tegra_bo_alloc(drm, bo);
360 if (err < 0)
361 goto release;
362
363 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
364 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
365
366 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
367 bo->flags |= TEGRA_BO_BOTTOM_UP;
368
369 return bo;
370
371release:
372 drm_gem_object_release(&bo->gem);
373 kfree(bo);
374 return ERR_PTR(err);
375}
376
377struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
378 struct drm_device *drm,
379 size_t size,
380 unsigned long flags,
381 u32 *handle)
382{
383 struct tegra_bo *bo;
384 int err;
385
386 bo = tegra_bo_create(drm, size, flags);
387 if (IS_ERR(bo))
388 return bo;
389
390 err = drm_gem_handle_create(file, &bo->gem, handle);
391 if (err) {
392 tegra_bo_free_object(&bo->gem);
393 return ERR_PTR(err);
394 }
395
396 drm_gem_object_put(&bo->gem);
397
398 return bo;
399}
400
401static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
402 struct dma_buf *buf)
403{
404 struct tegra_drm *tegra = drm->dev_private;
405 struct dma_buf_attachment *attach;
406 struct tegra_bo *bo;
407 int err;
408
409 bo = tegra_bo_alloc_object(drm, buf->size);
410 if (IS_ERR(bo))
411 return bo;
412
413 attach = dma_buf_attach(buf, drm->dev);
414 if (IS_ERR(attach)) {
415 err = PTR_ERR(attach);
416 goto free;
417 }
418
419 get_dma_buf(buf);
420
421 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
422 if (IS_ERR(bo->sgt)) {
423 err = PTR_ERR(bo->sgt);
424 goto detach;
425 }
426
427 if (tegra->domain) {
428 err = tegra_bo_iommu_map(tegra, bo);
429 if (err < 0)
430 goto detach;
431 }
432
433 bo->gem.import_attach = attach;
434
435 return bo;
436
437detach:
438 if (!IS_ERR_OR_NULL(bo->sgt))
439 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
440
441 dma_buf_detach(buf, attach);
442 dma_buf_put(buf);
443free:
444 drm_gem_object_release(&bo->gem);
445 kfree(bo);
446 return ERR_PTR(err);
447}
448
449void tegra_bo_free_object(struct drm_gem_object *gem)
450{
451 struct tegra_drm *tegra = gem->dev->dev_private;
452 struct tegra_bo *bo = to_tegra_bo(gem);
453
454 if (tegra->domain)
455 tegra_bo_iommu_unmap(tegra, bo);
456
457 if (gem->import_attach) {
458 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
459 DMA_TO_DEVICE);
460 drm_prime_gem_destroy(gem, NULL);
461 } else {
462 tegra_bo_free(gem->dev, bo);
463 }
464
465 drm_gem_object_release(gem);
466 kfree(bo);
467}
468
469int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
470 struct drm_mode_create_dumb *args)
471{
472 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
473 struct tegra_drm *tegra = drm->dev_private;
474 struct tegra_bo *bo;
475
476 args->pitch = round_up(min_pitch, tegra->pitch_align);
477 args->size = args->pitch * args->height;
478
479 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
480 &args->handle);
481 if (IS_ERR(bo))
482 return PTR_ERR(bo);
483
484 return 0;
485}
486
487static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
488{
489 struct vm_area_struct *vma = vmf->vma;
490 struct drm_gem_object *gem = vma->vm_private_data;
491 struct tegra_bo *bo = to_tegra_bo(gem);
492 struct page *page;
493 pgoff_t offset;
494
495 if (!bo->pages)
496 return VM_FAULT_SIGBUS;
497
498 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
499 page = bo->pages[offset];
500
501 return vmf_insert_page(vma, vmf->address, page);
502}
503
504const struct vm_operations_struct tegra_bo_vm_ops = {
505 .fault = tegra_bo_fault,
506 .open = drm_gem_vm_open,
507 .close = drm_gem_vm_close,
508};
509
510int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
511{
512 struct tegra_bo *bo = to_tegra_bo(gem);
513
514 if (!bo->pages) {
515 unsigned long vm_pgoff = vma->vm_pgoff;
516 int err;
517
518 /*
519 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
520 * and set the vm_pgoff (used as a fake buffer offset by DRM)
521 * to 0 as we want to map the whole buffer.
522 */
523 vma->vm_flags &= ~VM_PFNMAP;
524 vma->vm_pgoff = 0;
525
526 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
527 gem->size);
528 if (err < 0) {
529 drm_gem_vm_close(vma);
530 return err;
531 }
532
533 vma->vm_pgoff = vm_pgoff;
534 } else {
535 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
536
537 vma->vm_flags |= VM_MIXEDMAP;
538 vma->vm_flags &= ~VM_PFNMAP;
539
540 vma->vm_page_prot = pgprot_writecombine(prot);
541 }
542
543 return 0;
544}
545
546int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
547{
548 struct drm_gem_object *gem;
549 int err;
550
551 err = drm_gem_mmap(file, vma);
552 if (err < 0)
553 return err;
554
555 gem = vma->vm_private_data;
556
557 return __tegra_gem_mmap(gem, vma);
558}
559
560static struct sg_table *
561tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
562 enum dma_data_direction dir)
563{
564 struct drm_gem_object *gem = attach->dmabuf->priv;
565 struct tegra_bo *bo = to_tegra_bo(gem);
566 struct sg_table *sgt;
567
568 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
569 if (!sgt)
570 return NULL;
571
572 if (bo->pages) {
573 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
574 0, gem->size, GFP_KERNEL) < 0)
575 goto free;
576 } else {
577 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
578 gem->size) < 0)
579 goto free;
580 }
581
582 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
583 goto free;
584
585 return sgt;
586
587free:
588 sg_free_table(sgt);
589 kfree(sgt);
590 return NULL;
591}
592
593static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
594 struct sg_table *sgt,
595 enum dma_data_direction dir)
596{
597 struct drm_gem_object *gem = attach->dmabuf->priv;
598 struct tegra_bo *bo = to_tegra_bo(gem);
599
600 if (bo->pages)
601 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
602
603 sg_free_table(sgt);
604 kfree(sgt);
605}
606
607static void tegra_gem_prime_release(struct dma_buf *buf)
608{
609 drm_gem_dmabuf_release(buf);
610}
611
612static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
613 enum dma_data_direction direction)
614{
615 struct drm_gem_object *gem = buf->priv;
616 struct tegra_bo *bo = to_tegra_bo(gem);
617 struct drm_device *drm = gem->dev;
618
619 if (bo->pages)
620 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
621
622 return 0;
623}
624
625static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
626 enum dma_data_direction direction)
627{
628 struct drm_gem_object *gem = buf->priv;
629 struct tegra_bo *bo = to_tegra_bo(gem);
630 struct drm_device *drm = gem->dev;
631
632 if (bo->pages)
633 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
634
635 return 0;
636}
637
638static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
639{
640 struct drm_gem_object *gem = buf->priv;
641 int err;
642
643 err = drm_gem_mmap_obj(gem, gem->size, vma);
644 if (err < 0)
645 return err;
646
647 return __tegra_gem_mmap(gem, vma);
648}
649
650static int tegra_gem_prime_vmap(struct dma_buf *buf, struct dma_buf_map *map)
651{
652 struct drm_gem_object *gem = buf->priv;
653 struct tegra_bo *bo = to_tegra_bo(gem);
654
655 dma_buf_map_set_vaddr(map, bo->vaddr);
656
657 return 0;
658}
659
660static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct dma_buf_map *map)
661{
662}
663
664static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
665 .map_dma_buf = tegra_gem_prime_map_dma_buf,
666 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
667 .release = tegra_gem_prime_release,
668 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
669 .end_cpu_access = tegra_gem_prime_end_cpu_access,
670 .mmap = tegra_gem_prime_mmap,
671 .vmap = tegra_gem_prime_vmap,
672 .vunmap = tegra_gem_prime_vunmap,
673};
674
675struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
676 int flags)
677{
678 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
679
680 exp_info.exp_name = KBUILD_MODNAME;
681 exp_info.owner = gem->dev->driver->fops->owner;
682 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
683 exp_info.size = gem->size;
684 exp_info.flags = flags;
685 exp_info.priv = gem;
686
687 return drm_gem_dmabuf_export(gem->dev, &exp_info);
688}
689
690struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
691 struct dma_buf *buf)
692{
693 struct tegra_bo *bo;
694
695 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
696 struct drm_gem_object *gem = buf->priv;
697
698 if (gem->dev == drm) {
699 drm_gem_object_get(gem);
700 return gem;
701 }
702 }
703
704 bo = tegra_bo_import(drm, buf);
705 if (IS_ERR(bo))
706 return ERR_CAST(bo);
707
708 return &bo->gem;
709}