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1/*
2 * NVIDIA Tegra DRM GEM helper functions
3 *
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
5 * Copyright (C) 2013 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 return obj->paddr;
40}
41
42static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
43{
44}
45
46static void *tegra_bo_mmap(struct host1x_bo *bo)
47{
48 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
49
50 return obj->vaddr;
51}
52
53static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
54{
55}
56
57static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
58{
59 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
60
61 return obj->vaddr + page * PAGE_SIZE;
62}
63
64static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
65 void *addr)
66{
67}
68
69static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
70{
71 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
72
73 drm_gem_object_reference(&obj->gem);
74
75 return bo;
76}
77
78static const struct host1x_bo_ops tegra_bo_ops = {
79 .get = tegra_bo_get,
80 .put = tegra_bo_put,
81 .pin = tegra_bo_pin,
82 .unpin = tegra_bo_unpin,
83 .mmap = tegra_bo_mmap,
84 .munmap = tegra_bo_munmap,
85 .kmap = tegra_bo_kmap,
86 .kunmap = tegra_bo_kunmap,
87};
88
89static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
90{
91 int prot = IOMMU_READ | IOMMU_WRITE;
92 ssize_t err;
93
94 if (bo->mm)
95 return -EBUSY;
96
97 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
98 if (!bo->mm)
99 return -ENOMEM;
100
101 err = drm_mm_insert_node_generic(&tegra->mm, bo->mm, bo->gem.size,
102 PAGE_SIZE, 0, 0, 0);
103 if (err < 0) {
104 dev_err(tegra->drm->dev, "out of I/O virtual memory: %zd\n",
105 err);
106 goto free;
107 }
108
109 bo->paddr = bo->mm->start;
110
111 err = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
112 bo->sgt->nents, prot);
113 if (err < 0) {
114 dev_err(tegra->drm->dev, "failed to map buffer: %zd\n", err);
115 goto remove;
116 }
117
118 bo->size = err;
119
120 return 0;
121
122remove:
123 drm_mm_remove_node(bo->mm);
124free:
125 kfree(bo->mm);
126 return err;
127}
128
129static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
130{
131 if (!bo->mm)
132 return 0;
133
134 iommu_unmap(tegra->domain, bo->paddr, bo->size);
135 drm_mm_remove_node(bo->mm);
136 kfree(bo->mm);
137
138 return 0;
139}
140
141static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
142 size_t size)
143{
144 struct tegra_bo *bo;
145 int err;
146
147 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
148 if (!bo)
149 return ERR_PTR(-ENOMEM);
150
151 host1x_bo_init(&bo->base, &tegra_bo_ops);
152 size = round_up(size, PAGE_SIZE);
153
154 err = drm_gem_object_init(drm, &bo->gem, size);
155 if (err < 0)
156 goto free;
157
158 err = drm_gem_create_mmap_offset(&bo->gem);
159 if (err < 0)
160 goto release;
161
162 return bo;
163
164release:
165 drm_gem_object_release(&bo->gem);
166free:
167 kfree(bo);
168 return ERR_PTR(err);
169}
170
171static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
172{
173 if (bo->pages) {
174 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
175 sg_free_table(bo->sgt);
176 kfree(bo->sgt);
177 } else if (bo->vaddr) {
178 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
179 }
180}
181
182static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
183{
184 struct scatterlist *s;
185 unsigned int i;
186
187 bo->pages = drm_gem_get_pages(&bo->gem);
188 if (IS_ERR(bo->pages))
189 return PTR_ERR(bo->pages);
190
191 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
192
193 bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
194 if (IS_ERR(bo->sgt))
195 goto put_pages;
196
197 /*
198 * Fake up the SG table so that dma_sync_sg_for_device() can be used
199 * to flush the pages associated with it.
200 *
201 * TODO: Replace this by drm_clflash_sg() once it can be implemented
202 * without relying on symbols that are not exported.
203 */
204 for_each_sg(bo->sgt->sgl, s, bo->sgt->nents, i)
205 sg_dma_address(s) = sg_phys(s);
206
207 dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
208 DMA_TO_DEVICE);
209
210 return 0;
211
212put_pages:
213 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
214 return PTR_ERR(bo->sgt);
215}
216
217static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
218{
219 struct tegra_drm *tegra = drm->dev_private;
220 int err;
221
222 if (tegra->domain) {
223 err = tegra_bo_get_pages(drm, bo);
224 if (err < 0)
225 return err;
226
227 err = tegra_bo_iommu_map(tegra, bo);
228 if (err < 0) {
229 tegra_bo_free(drm, bo);
230 return err;
231 }
232 } else {
233 size_t size = bo->gem.size;
234
235 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->paddr,
236 GFP_KERNEL | __GFP_NOWARN);
237 if (!bo->vaddr) {
238 dev_err(drm->dev,
239 "failed to allocate buffer of size %zu\n",
240 size);
241 return -ENOMEM;
242 }
243 }
244
245 return 0;
246}
247
248struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
249 unsigned long flags)
250{
251 struct tegra_bo *bo;
252 int err;
253
254 bo = tegra_bo_alloc_object(drm, size);
255 if (IS_ERR(bo))
256 return bo;
257
258 err = tegra_bo_alloc(drm, bo);
259 if (err < 0)
260 goto release;
261
262 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
263 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
264
265 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
266 bo->flags |= TEGRA_BO_BOTTOM_UP;
267
268 return bo;
269
270release:
271 drm_gem_object_release(&bo->gem);
272 kfree(bo);
273 return ERR_PTR(err);
274}
275
276struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
277 struct drm_device *drm,
278 size_t size,
279 unsigned long flags,
280 u32 *handle)
281{
282 struct tegra_bo *bo;
283 int err;
284
285 bo = tegra_bo_create(drm, size, flags);
286 if (IS_ERR(bo))
287 return bo;
288
289 err = drm_gem_handle_create(file, &bo->gem, handle);
290 if (err) {
291 tegra_bo_free_object(&bo->gem);
292 return ERR_PTR(err);
293 }
294
295 drm_gem_object_unreference_unlocked(&bo->gem);
296
297 return bo;
298}
299
300static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
301 struct dma_buf *buf)
302{
303 struct tegra_drm *tegra = drm->dev_private;
304 struct dma_buf_attachment *attach;
305 struct tegra_bo *bo;
306 int err;
307
308 bo = tegra_bo_alloc_object(drm, buf->size);
309 if (IS_ERR(bo))
310 return bo;
311
312 attach = dma_buf_attach(buf, drm->dev);
313 if (IS_ERR(attach)) {
314 err = PTR_ERR(attach);
315 goto free;
316 }
317
318 get_dma_buf(buf);
319
320 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
321 if (!bo->sgt) {
322 err = -ENOMEM;
323 goto detach;
324 }
325
326 if (IS_ERR(bo->sgt)) {
327 err = PTR_ERR(bo->sgt);
328 goto detach;
329 }
330
331 if (tegra->domain) {
332 err = tegra_bo_iommu_map(tegra, bo);
333 if (err < 0)
334 goto detach;
335 } else {
336 if (bo->sgt->nents > 1) {
337 err = -EINVAL;
338 goto detach;
339 }
340
341 bo->paddr = sg_dma_address(bo->sgt->sgl);
342 }
343
344 bo->gem.import_attach = attach;
345
346 return bo;
347
348detach:
349 if (!IS_ERR_OR_NULL(bo->sgt))
350 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
351
352 dma_buf_detach(buf, attach);
353 dma_buf_put(buf);
354free:
355 drm_gem_object_release(&bo->gem);
356 kfree(bo);
357 return ERR_PTR(err);
358}
359
360void tegra_bo_free_object(struct drm_gem_object *gem)
361{
362 struct tegra_drm *tegra = gem->dev->dev_private;
363 struct tegra_bo *bo = to_tegra_bo(gem);
364
365 if (tegra->domain)
366 tegra_bo_iommu_unmap(tegra, bo);
367
368 if (gem->import_attach) {
369 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
370 DMA_TO_DEVICE);
371 drm_prime_gem_destroy(gem, NULL);
372 } else {
373 tegra_bo_free(gem->dev, bo);
374 }
375
376 drm_gem_object_release(gem);
377 kfree(bo);
378}
379
380int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
381 struct drm_mode_create_dumb *args)
382{
383 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
384 struct tegra_drm *tegra = drm->dev_private;
385 struct tegra_bo *bo;
386
387 args->pitch = round_up(min_pitch, tegra->pitch_align);
388 args->size = args->pitch * args->height;
389
390 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
391 &args->handle);
392 if (IS_ERR(bo))
393 return PTR_ERR(bo);
394
395 return 0;
396}
397
398int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
399 u32 handle, u64 *offset)
400{
401 struct drm_gem_object *gem;
402 struct tegra_bo *bo;
403
404 gem = drm_gem_object_lookup(drm, file, handle);
405 if (!gem) {
406 dev_err(drm->dev, "failed to lookup GEM object\n");
407 return -EINVAL;
408 }
409
410 bo = to_tegra_bo(gem);
411
412 *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
413
414 drm_gem_object_unreference_unlocked(gem);
415
416 return 0;
417}
418
419static int tegra_bo_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
420{
421 struct drm_gem_object *gem = vma->vm_private_data;
422 struct tegra_bo *bo = to_tegra_bo(gem);
423 struct page *page;
424 pgoff_t offset;
425 int err;
426
427 if (!bo->pages)
428 return VM_FAULT_SIGBUS;
429
430 offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >> PAGE_SHIFT;
431 page = bo->pages[offset];
432
433 err = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
434 switch (err) {
435 case -EAGAIN:
436 case 0:
437 case -ERESTARTSYS:
438 case -EINTR:
439 case -EBUSY:
440 return VM_FAULT_NOPAGE;
441
442 case -ENOMEM:
443 return VM_FAULT_OOM;
444 }
445
446 return VM_FAULT_SIGBUS;
447}
448
449const struct vm_operations_struct tegra_bo_vm_ops = {
450 .fault = tegra_bo_fault,
451 .open = drm_gem_vm_open,
452 .close = drm_gem_vm_close,
453};
454
455int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
456{
457 struct drm_gem_object *gem;
458 struct tegra_bo *bo;
459 int ret;
460
461 ret = drm_gem_mmap(file, vma);
462 if (ret)
463 return ret;
464
465 gem = vma->vm_private_data;
466 bo = to_tegra_bo(gem);
467
468 if (!bo->pages) {
469 unsigned long vm_pgoff = vma->vm_pgoff;
470
471 vma->vm_flags &= ~VM_PFNMAP;
472 vma->vm_pgoff = 0;
473
474 ret = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr,
475 gem->size);
476 if (ret) {
477 drm_gem_vm_close(vma);
478 return ret;
479 }
480
481 vma->vm_pgoff = vm_pgoff;
482 } else {
483 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
484
485 vma->vm_flags |= VM_MIXEDMAP;
486 vma->vm_flags &= ~VM_PFNMAP;
487
488 vma->vm_page_prot = pgprot_writecombine(prot);
489 }
490
491 return 0;
492}
493
494static struct sg_table *
495tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
496 enum dma_data_direction dir)
497{
498 struct drm_gem_object *gem = attach->dmabuf->priv;
499 struct tegra_bo *bo = to_tegra_bo(gem);
500 struct sg_table *sgt;
501
502 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
503 if (!sgt)
504 return NULL;
505
506 if (bo->pages) {
507 struct scatterlist *sg;
508 unsigned int i;
509
510 if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
511 goto free;
512
513 for_each_sg(sgt->sgl, sg, bo->num_pages, i)
514 sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
515
516 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
517 goto free;
518 } else {
519 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
520 goto free;
521
522 sg_dma_address(sgt->sgl) = bo->paddr;
523 sg_dma_len(sgt->sgl) = gem->size;
524 }
525
526 return sgt;
527
528free:
529 sg_free_table(sgt);
530 kfree(sgt);
531 return NULL;
532}
533
534static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
535 struct sg_table *sgt,
536 enum dma_data_direction dir)
537{
538 struct drm_gem_object *gem = attach->dmabuf->priv;
539 struct tegra_bo *bo = to_tegra_bo(gem);
540
541 if (bo->pages)
542 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
543
544 sg_free_table(sgt);
545 kfree(sgt);
546}
547
548static void tegra_gem_prime_release(struct dma_buf *buf)
549{
550 drm_gem_dmabuf_release(buf);
551}
552
553static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
554 unsigned long page)
555{
556 return NULL;
557}
558
559static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
560 unsigned long page,
561 void *addr)
562{
563}
564
565static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
566{
567 return NULL;
568}
569
570static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
571 void *addr)
572{
573}
574
575static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
576{
577 return -EINVAL;
578}
579
580static void *tegra_gem_prime_vmap(struct dma_buf *buf)
581{
582 struct drm_gem_object *gem = buf->priv;
583 struct tegra_bo *bo = to_tegra_bo(gem);
584
585 return bo->vaddr;
586}
587
588static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
589{
590}
591
592static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
593 .map_dma_buf = tegra_gem_prime_map_dma_buf,
594 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
595 .release = tegra_gem_prime_release,
596 .kmap_atomic = tegra_gem_prime_kmap_atomic,
597 .kunmap_atomic = tegra_gem_prime_kunmap_atomic,
598 .kmap = tegra_gem_prime_kmap,
599 .kunmap = tegra_gem_prime_kunmap,
600 .mmap = tegra_gem_prime_mmap,
601 .vmap = tegra_gem_prime_vmap,
602 .vunmap = tegra_gem_prime_vunmap,
603};
604
605struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
606 struct drm_gem_object *gem,
607 int flags)
608{
609 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
610
611 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
612 exp_info.size = gem->size;
613 exp_info.flags = flags;
614 exp_info.priv = gem;
615
616 return dma_buf_export(&exp_info);
617}
618
619struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
620 struct dma_buf *buf)
621{
622 struct tegra_bo *bo;
623
624 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
625 struct drm_gem_object *gem = buf->priv;
626
627 if (gem->dev == drm) {
628 drm_gem_object_reference(gem);
629 return gem;
630 }
631 }
632
633 bo = tegra_bo_import(drm, buf);
634 if (IS_ERR(bo))
635 return ERR_CAST(bo);
636
637 return &bo->gem;
638}
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#include <linux/vmalloc.h>
17
18#include <drm/drm_drv.h>
19#include <drm/drm_prime.h>
20#include <drm/tegra_drm.h>
21
22#include "drm.h"
23#include "gem.h"
24
25MODULE_IMPORT_NS(DMA_BUF);
26
27static unsigned int sg_dma_count_chunks(struct scatterlist *sgl, unsigned int nents)
28{
29 dma_addr_t next = ~(dma_addr_t)0;
30 unsigned int count = 0, i;
31 struct scatterlist *s;
32
33 for_each_sg(sgl, s, nents, i) {
34 /* sg_dma_address(s) is only valid for entries that have sg_dma_len(s) != 0. */
35 if (!sg_dma_len(s))
36 continue;
37
38 if (sg_dma_address(s) != next) {
39 next = sg_dma_address(s) + sg_dma_len(s);
40 count++;
41 }
42 }
43
44 return count;
45}
46
47static inline unsigned int sgt_dma_count_chunks(struct sg_table *sgt)
48{
49 return sg_dma_count_chunks(sgt->sgl, sgt->nents);
50}
51
52static void tegra_bo_put(struct host1x_bo *bo)
53{
54 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
55
56 drm_gem_object_put(&obj->gem);
57}
58
59static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
60 enum dma_data_direction direction)
61{
62 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
63 struct drm_gem_object *gem = &obj->gem;
64 struct host1x_bo_mapping *map;
65 int err;
66
67 map = kzalloc(sizeof(*map), GFP_KERNEL);
68 if (!map)
69 return ERR_PTR(-ENOMEM);
70
71 kref_init(&map->ref);
72 map->bo = host1x_bo_get(bo);
73 map->direction = direction;
74 map->dev = dev;
75
76 /*
77 * Imported buffers need special treatment to satisfy the semantics of DMA-BUF.
78 */
79 if (gem->import_attach) {
80 struct dma_buf *buf = gem->import_attach->dmabuf;
81
82 map->attach = dma_buf_attach(buf, dev);
83 if (IS_ERR(map->attach)) {
84 err = PTR_ERR(map->attach);
85 goto free;
86 }
87
88 map->sgt = dma_buf_map_attachment_unlocked(map->attach, direction);
89 if (IS_ERR(map->sgt)) {
90 dma_buf_detach(buf, map->attach);
91 err = PTR_ERR(map->sgt);
92 map->sgt = NULL;
93 goto free;
94 }
95
96 err = sgt_dma_count_chunks(map->sgt);
97 map->size = gem->size;
98
99 goto out;
100 }
101
102 /*
103 * If we don't have a mapping for this buffer yet, return an SG table
104 * so that host1x can do the mapping for us via the DMA API.
105 */
106 map->sgt = kzalloc(sizeof(*map->sgt), GFP_KERNEL);
107 if (!map->sgt) {
108 err = -ENOMEM;
109 goto free;
110 }
111
112 if (obj->pages) {
113 /*
114 * If the buffer object was allocated from the explicit IOMMU
115 * API code paths, construct an SG table from the pages.
116 */
117 err = sg_alloc_table_from_pages(map->sgt, obj->pages, obj->num_pages, 0, gem->size,
118 GFP_KERNEL);
119 if (err < 0)
120 goto free;
121 } else {
122 /*
123 * If the buffer object had no pages allocated and if it was
124 * not imported, it had to be allocated with the DMA API, so
125 * the DMA API helper can be used.
126 */
127 err = dma_get_sgtable(dev, map->sgt, obj->vaddr, obj->iova, gem->size);
128 if (err < 0)
129 goto free;
130 }
131
132 err = dma_map_sgtable(dev, map->sgt, direction, 0);
133 if (err)
134 goto free_sgt;
135
136out:
137 /*
138 * If we've manually mapped the buffer object through the IOMMU, make sure to return the
139 * existing IOVA address of our mapping.
140 */
141 if (!obj->mm) {
142 map->phys = sg_dma_address(map->sgt->sgl);
143 map->chunks = err;
144 } else {
145 map->phys = obj->iova;
146 map->chunks = 1;
147 }
148
149 map->size = gem->size;
150
151 return map;
152
153free_sgt:
154 sg_free_table(map->sgt);
155free:
156 kfree(map->sgt);
157 kfree(map);
158 return ERR_PTR(err);
159}
160
161static void tegra_bo_unpin(struct host1x_bo_mapping *map)
162{
163 if (map->attach) {
164 dma_buf_unmap_attachment_unlocked(map->attach, map->sgt,
165 map->direction);
166 dma_buf_detach(map->attach->dmabuf, map->attach);
167 } else {
168 dma_unmap_sgtable(map->dev, map->sgt, map->direction, 0);
169 sg_free_table(map->sgt);
170 kfree(map->sgt);
171 }
172
173 host1x_bo_put(map->bo);
174 kfree(map);
175}
176
177static void *tegra_bo_mmap(struct host1x_bo *bo)
178{
179 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
180 struct iosys_map map = { 0 };
181 void *vaddr;
182 int ret;
183
184 if (obj->vaddr)
185 return obj->vaddr;
186
187 if (obj->gem.import_attach) {
188 ret = dma_buf_vmap_unlocked(obj->gem.import_attach->dmabuf, &map);
189 if (ret < 0)
190 return ERR_PTR(ret);
191
192 return map.vaddr;
193 }
194
195 vaddr = vmap(obj->pages, obj->num_pages, VM_MAP,
196 pgprot_writecombine(PAGE_KERNEL));
197 if (!vaddr)
198 return ERR_PTR(-ENOMEM);
199
200 return vaddr;
201}
202
203static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
204{
205 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
206 struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr);
207
208 if (obj->vaddr)
209 return;
210
211 if (obj->gem.import_attach)
212 return dma_buf_vunmap_unlocked(obj->gem.import_attach->dmabuf, &map);
213
214 vunmap(addr);
215}
216
217static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
218{
219 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
220
221 drm_gem_object_get(&obj->gem);
222
223 return bo;
224}
225
226static const struct host1x_bo_ops tegra_bo_ops = {
227 .get = tegra_bo_get,
228 .put = tegra_bo_put,
229 .pin = tegra_bo_pin,
230 .unpin = tegra_bo_unpin,
231 .mmap = tegra_bo_mmap,
232 .munmap = tegra_bo_munmap,
233};
234
235static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
236{
237 int prot = IOMMU_READ | IOMMU_WRITE;
238 int err;
239
240 if (bo->mm)
241 return -EBUSY;
242
243 bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
244 if (!bo->mm)
245 return -ENOMEM;
246
247 mutex_lock(&tegra->mm_lock);
248
249 err = drm_mm_insert_node_generic(&tegra->mm,
250 bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
251 if (err < 0) {
252 dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
253 err);
254 goto unlock;
255 }
256
257 bo->iova = bo->mm->start;
258
259 bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
260 if (!bo->size) {
261 dev_err(tegra->drm->dev, "failed to map buffer\n");
262 err = -ENOMEM;
263 goto remove;
264 }
265
266 mutex_unlock(&tegra->mm_lock);
267
268 return 0;
269
270remove:
271 drm_mm_remove_node(bo->mm);
272unlock:
273 mutex_unlock(&tegra->mm_lock);
274 kfree(bo->mm);
275 return err;
276}
277
278static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
279{
280 if (!bo->mm)
281 return 0;
282
283 mutex_lock(&tegra->mm_lock);
284 iommu_unmap(tegra->domain, bo->iova, bo->size);
285 drm_mm_remove_node(bo->mm);
286 mutex_unlock(&tegra->mm_lock);
287
288 kfree(bo->mm);
289
290 return 0;
291}
292
293static const struct drm_gem_object_funcs tegra_gem_object_funcs = {
294 .free = tegra_bo_free_object,
295 .export = tegra_gem_prime_export,
296 .vm_ops = &tegra_bo_vm_ops,
297};
298
299static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
300 size_t size)
301{
302 struct tegra_bo *bo;
303 int err;
304
305 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
306 if (!bo)
307 return ERR_PTR(-ENOMEM);
308
309 bo->gem.funcs = &tegra_gem_object_funcs;
310
311 host1x_bo_init(&bo->base, &tegra_bo_ops);
312 size = round_up(size, PAGE_SIZE);
313
314 err = drm_gem_object_init(drm, &bo->gem, size);
315 if (err < 0)
316 goto free;
317
318 err = drm_gem_create_mmap_offset(&bo->gem);
319 if (err < 0)
320 goto release;
321
322 return bo;
323
324release:
325 drm_gem_object_release(&bo->gem);
326free:
327 kfree(bo);
328 return ERR_PTR(err);
329}
330
331static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
332{
333 if (bo->pages) {
334 dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
335 drm_gem_put_pages(&bo->gem, bo->pages, true, true);
336 sg_free_table(bo->sgt);
337 kfree(bo->sgt);
338 } else if (bo->vaddr) {
339 dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
340 }
341}
342
343static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
344{
345 int err;
346
347 bo->pages = drm_gem_get_pages(&bo->gem);
348 if (IS_ERR(bo->pages))
349 return PTR_ERR(bo->pages);
350
351 bo->num_pages = bo->gem.size >> PAGE_SHIFT;
352
353 bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages);
354 if (IS_ERR(bo->sgt)) {
355 err = PTR_ERR(bo->sgt);
356 goto put_pages;
357 }
358
359 err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
360 if (err)
361 goto free_sgt;
362
363 return 0;
364
365free_sgt:
366 sg_free_table(bo->sgt);
367 kfree(bo->sgt);
368put_pages:
369 drm_gem_put_pages(&bo->gem, bo->pages, false, false);
370 return err;
371}
372
373static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
374{
375 struct tegra_drm *tegra = drm->dev_private;
376 int err;
377
378 if (tegra->domain) {
379 err = tegra_bo_get_pages(drm, bo);
380 if (err < 0)
381 return err;
382
383 err = tegra_bo_iommu_map(tegra, bo);
384 if (err < 0) {
385 tegra_bo_free(drm, bo);
386 return err;
387 }
388 } else {
389 size_t size = bo->gem.size;
390
391 bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
392 GFP_KERNEL | __GFP_NOWARN);
393 if (!bo->vaddr) {
394 dev_err(drm->dev,
395 "failed to allocate buffer of size %zu\n",
396 size);
397 return -ENOMEM;
398 }
399 }
400
401 return 0;
402}
403
404struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
405 unsigned long flags)
406{
407 struct tegra_bo *bo;
408 int err;
409
410 bo = tegra_bo_alloc_object(drm, size);
411 if (IS_ERR(bo))
412 return bo;
413
414 err = tegra_bo_alloc(drm, bo);
415 if (err < 0)
416 goto release;
417
418 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
419 bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
420
421 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
422 bo->flags |= TEGRA_BO_BOTTOM_UP;
423
424 return bo;
425
426release:
427 drm_gem_object_release(&bo->gem);
428 kfree(bo);
429 return ERR_PTR(err);
430}
431
432struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
433 struct drm_device *drm,
434 size_t size,
435 unsigned long flags,
436 u32 *handle)
437{
438 struct tegra_bo *bo;
439 int err;
440
441 bo = tegra_bo_create(drm, size, flags);
442 if (IS_ERR(bo))
443 return bo;
444
445 err = drm_gem_handle_create(file, &bo->gem, handle);
446 if (err) {
447 tegra_bo_free_object(&bo->gem);
448 return ERR_PTR(err);
449 }
450
451 drm_gem_object_put(&bo->gem);
452
453 return bo;
454}
455
456static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
457 struct dma_buf *buf)
458{
459 struct tegra_drm *tegra = drm->dev_private;
460 struct dma_buf_attachment *attach;
461 struct tegra_bo *bo;
462 int err;
463
464 bo = tegra_bo_alloc_object(drm, buf->size);
465 if (IS_ERR(bo))
466 return bo;
467
468 attach = dma_buf_attach(buf, drm->dev);
469 if (IS_ERR(attach)) {
470 err = PTR_ERR(attach);
471 goto free;
472 }
473
474 get_dma_buf(buf);
475
476 bo->sgt = dma_buf_map_attachment_unlocked(attach, DMA_TO_DEVICE);
477 if (IS_ERR(bo->sgt)) {
478 err = PTR_ERR(bo->sgt);
479 goto detach;
480 }
481
482 if (tegra->domain) {
483 err = tegra_bo_iommu_map(tegra, bo);
484 if (err < 0)
485 goto detach;
486 }
487
488 bo->gem.import_attach = attach;
489
490 return bo;
491
492detach:
493 if (!IS_ERR_OR_NULL(bo->sgt))
494 dma_buf_unmap_attachment_unlocked(attach, bo->sgt, DMA_TO_DEVICE);
495
496 dma_buf_detach(buf, attach);
497 dma_buf_put(buf);
498free:
499 drm_gem_object_release(&bo->gem);
500 kfree(bo);
501 return ERR_PTR(err);
502}
503
504void tegra_bo_free_object(struct drm_gem_object *gem)
505{
506 struct tegra_drm *tegra = gem->dev->dev_private;
507 struct host1x_bo_mapping *mapping, *tmp;
508 struct tegra_bo *bo = to_tegra_bo(gem);
509
510 /* remove all mappings of this buffer object from any caches */
511 list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) {
512 if (mapping->cache)
513 host1x_bo_unpin(mapping);
514 else
515 dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping,
516 dev_name(mapping->dev));
517 }
518
519 if (tegra->domain)
520 tegra_bo_iommu_unmap(tegra, bo);
521
522 if (gem->import_attach) {
523 dma_buf_unmap_attachment_unlocked(gem->import_attach, bo->sgt,
524 DMA_TO_DEVICE);
525 drm_prime_gem_destroy(gem, NULL);
526 } else {
527 tegra_bo_free(gem->dev, bo);
528 }
529
530 drm_gem_object_release(gem);
531 kfree(bo);
532}
533
534int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
535 struct drm_mode_create_dumb *args)
536{
537 unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
538 struct tegra_drm *tegra = drm->dev_private;
539 struct tegra_bo *bo;
540
541 args->pitch = round_up(min_pitch, tegra->pitch_align);
542 args->size = args->pitch * args->height;
543
544 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
545 &args->handle);
546 if (IS_ERR(bo))
547 return PTR_ERR(bo);
548
549 return 0;
550}
551
552static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
553{
554 struct vm_area_struct *vma = vmf->vma;
555 struct drm_gem_object *gem = vma->vm_private_data;
556 struct tegra_bo *bo = to_tegra_bo(gem);
557 struct page *page;
558 pgoff_t offset;
559
560 if (!bo->pages)
561 return VM_FAULT_SIGBUS;
562
563 offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
564 page = bo->pages[offset];
565
566 return vmf_insert_page(vma, vmf->address, page);
567}
568
569const struct vm_operations_struct tegra_bo_vm_ops = {
570 .fault = tegra_bo_fault,
571 .open = drm_gem_vm_open,
572 .close = drm_gem_vm_close,
573};
574
575int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
576{
577 struct tegra_bo *bo = to_tegra_bo(gem);
578
579 if (!bo->pages) {
580 unsigned long vm_pgoff = vma->vm_pgoff;
581 int err;
582
583 /*
584 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
585 * and set the vm_pgoff (used as a fake buffer offset by DRM)
586 * to 0 as we want to map the whole buffer.
587 */
588 vm_flags_clear(vma, VM_PFNMAP);
589 vma->vm_pgoff = 0;
590
591 err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
592 gem->size);
593 if (err < 0) {
594 drm_gem_vm_close(vma);
595 return err;
596 }
597
598 vma->vm_pgoff = vm_pgoff;
599 } else {
600 pgprot_t prot = vm_get_page_prot(vma->vm_flags);
601
602 vm_flags_mod(vma, VM_MIXEDMAP, VM_PFNMAP);
603
604 vma->vm_page_prot = pgprot_writecombine(prot);
605 }
606
607 return 0;
608}
609
610int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
611{
612 struct drm_gem_object *gem;
613 int err;
614
615 err = drm_gem_mmap(file, vma);
616 if (err < 0)
617 return err;
618
619 gem = vma->vm_private_data;
620
621 return __tegra_gem_mmap(gem, vma);
622}
623
624static struct sg_table *
625tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
626 enum dma_data_direction dir)
627{
628 struct drm_gem_object *gem = attach->dmabuf->priv;
629 struct tegra_bo *bo = to_tegra_bo(gem);
630 struct sg_table *sgt;
631
632 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
633 if (!sgt)
634 return NULL;
635
636 if (bo->pages) {
637 if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
638 0, gem->size, GFP_KERNEL) < 0)
639 goto free;
640 } else {
641 if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
642 gem->size) < 0)
643 goto free;
644 }
645
646 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
647 goto free;
648
649 return sgt;
650
651free:
652 sg_free_table(sgt);
653 kfree(sgt);
654 return NULL;
655}
656
657static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
658 struct sg_table *sgt,
659 enum dma_data_direction dir)
660{
661 struct drm_gem_object *gem = attach->dmabuf->priv;
662 struct tegra_bo *bo = to_tegra_bo(gem);
663
664 if (bo->pages)
665 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
666
667 sg_free_table(sgt);
668 kfree(sgt);
669}
670
671static void tegra_gem_prime_release(struct dma_buf *buf)
672{
673 drm_gem_dmabuf_release(buf);
674}
675
676static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
677 enum dma_data_direction direction)
678{
679 struct drm_gem_object *gem = buf->priv;
680 struct tegra_bo *bo = to_tegra_bo(gem);
681 struct drm_device *drm = gem->dev;
682
683 if (bo->pages)
684 dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
685
686 return 0;
687}
688
689static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
690 enum dma_data_direction direction)
691{
692 struct drm_gem_object *gem = buf->priv;
693 struct tegra_bo *bo = to_tegra_bo(gem);
694 struct drm_device *drm = gem->dev;
695
696 if (bo->pages)
697 dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
698
699 return 0;
700}
701
702static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
703{
704 struct drm_gem_object *gem = buf->priv;
705 int err;
706
707 err = drm_gem_mmap_obj(gem, gem->size, vma);
708 if (err < 0)
709 return err;
710
711 return __tegra_gem_mmap(gem, vma);
712}
713
714static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map)
715{
716 struct drm_gem_object *gem = buf->priv;
717 struct tegra_bo *bo = to_tegra_bo(gem);
718 void *vaddr;
719
720 vaddr = tegra_bo_mmap(&bo->base);
721 if (IS_ERR(vaddr))
722 return PTR_ERR(vaddr);
723
724 iosys_map_set_vaddr(map, vaddr);
725
726 return 0;
727}
728
729static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map)
730{
731 struct drm_gem_object *gem = buf->priv;
732 struct tegra_bo *bo = to_tegra_bo(gem);
733
734 tegra_bo_munmap(&bo->base, map->vaddr);
735}
736
737static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
738 .map_dma_buf = tegra_gem_prime_map_dma_buf,
739 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
740 .release = tegra_gem_prime_release,
741 .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
742 .end_cpu_access = tegra_gem_prime_end_cpu_access,
743 .mmap = tegra_gem_prime_mmap,
744 .vmap = tegra_gem_prime_vmap,
745 .vunmap = tegra_gem_prime_vunmap,
746};
747
748struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
749 int flags)
750{
751 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
752
753 exp_info.exp_name = KBUILD_MODNAME;
754 exp_info.owner = gem->dev->driver->fops->owner;
755 exp_info.ops = &tegra_gem_prime_dmabuf_ops;
756 exp_info.size = gem->size;
757 exp_info.flags = flags;
758 exp_info.priv = gem;
759
760 return drm_gem_dmabuf_export(gem->dev, &exp_info);
761}
762
763struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
764 struct dma_buf *buf)
765{
766 struct tegra_bo *bo;
767
768 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
769 struct drm_gem_object *gem = buf->priv;
770
771 if (gem->dev == drm) {
772 drm_gem_object_get(gem);
773 return gem;
774 }
775 }
776
777 bo = tegra_bo_import(drm, buf);
778 if (IS_ERR(bo))
779 return ERR_CAST(bo);
780
781 return &bo->gem;
782}
783
784struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle)
785{
786 struct drm_gem_object *gem;
787 struct tegra_bo *bo;
788
789 gem = drm_gem_object_lookup(file, handle);
790 if (!gem)
791 return NULL;
792
793 bo = to_tegra_bo(gem);
794 return &bo->base;
795}