[go: nahoru, domu]
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 <drm/tegra_drm.h>
18
19#include "drm.h"
20#include "gem.h"
21
22static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
23{
24	return container_of(bo, struct tegra_bo, base);
25}
26
27static void tegra_bo_put(struct host1x_bo *bo)
28{
29	struct tegra_bo *obj = host1x_to_tegra_bo(bo);
30	struct drm_device *drm = obj->gem.dev;
31
32	mutex_lock(&drm->struct_mutex);
33	drm_gem_object_unreference(&obj->gem);
34	mutex_unlock(&drm->struct_mutex);
35}
36
37static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
38{
39	struct tegra_bo *obj = host1x_to_tegra_bo(bo);
40
41	return obj->paddr;
42}
43
44static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
45{
46}
47
48static void *tegra_bo_mmap(struct host1x_bo *bo)
49{
50	struct tegra_bo *obj = host1x_to_tegra_bo(bo);
51
52	return obj->vaddr;
53}
54
55static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
56{
57}
58
59static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
60{
61	struct tegra_bo *obj = host1x_to_tegra_bo(bo);
62
63	return obj->vaddr + page * PAGE_SIZE;
64}
65
66static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
67			    void *addr)
68{
69}
70
71static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
72{
73	struct tegra_bo *obj = host1x_to_tegra_bo(bo);
74	struct drm_device *drm = obj->gem.dev;
75
76	mutex_lock(&drm->struct_mutex);
77	drm_gem_object_reference(&obj->gem);
78	mutex_unlock(&drm->struct_mutex);
79
80	return bo;
81}
82
83static const struct host1x_bo_ops tegra_bo_ops = {
84	.get = tegra_bo_get,
85	.put = tegra_bo_put,
86	.pin = tegra_bo_pin,
87	.unpin = tegra_bo_unpin,
88	.mmap = tegra_bo_mmap,
89	.munmap = tegra_bo_munmap,
90	.kmap = tegra_bo_kmap,
91	.kunmap = tegra_bo_kunmap,
92};
93
94static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
95{
96	dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
97}
98
99struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size,
100				 unsigned long flags)
101{
102	struct tegra_bo *bo;
103	int err;
104
105	bo = kzalloc(sizeof(*bo), GFP_KERNEL);
106	if (!bo)
107		return ERR_PTR(-ENOMEM);
108
109	host1x_bo_init(&bo->base, &tegra_bo_ops);
110	size = round_up(size, PAGE_SIZE);
111
112	bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
113					   GFP_KERNEL | __GFP_NOWARN);
114	if (!bo->vaddr) {
115		dev_err(drm->dev, "failed to allocate buffer with size %u\n",
116			size);
117		err = -ENOMEM;
118		goto err_dma;
119	}
120
121	err = drm_gem_object_init(drm, &bo->gem, size);
122	if (err)
123		goto err_init;
124
125	err = drm_gem_create_mmap_offset(&bo->gem);
126	if (err)
127		goto err_mmap;
128
129	if (flags & DRM_TEGRA_GEM_CREATE_TILED)
130		bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
131
132	if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
133		bo->flags |= TEGRA_BO_BOTTOM_UP;
134
135	return bo;
136
137err_mmap:
138	drm_gem_object_release(&bo->gem);
139err_init:
140	tegra_bo_destroy(drm, bo);
141err_dma:
142	kfree(bo);
143
144	return ERR_PTR(err);
145}
146
147struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
148					     struct drm_device *drm,
149					     unsigned int size,
150					     unsigned long flags,
151					     unsigned int *handle)
152{
153	struct tegra_bo *bo;
154	int ret;
155
156	bo = tegra_bo_create(drm, size, flags);
157	if (IS_ERR(bo))
158		return bo;
159
160	ret = drm_gem_handle_create(file, &bo->gem, handle);
161	if (ret)
162		goto err;
163
164	drm_gem_object_unreference_unlocked(&bo->gem);
165
166	return bo;
167
168err:
169	tegra_bo_free_object(&bo->gem);
170	return ERR_PTR(ret);
171}
172
173static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
174					struct dma_buf *buf)
175{
176	struct dma_buf_attachment *attach;
177	struct tegra_bo *bo;
178	ssize_t size;
179	int err;
180
181	bo = kzalloc(sizeof(*bo), GFP_KERNEL);
182	if (!bo)
183		return ERR_PTR(-ENOMEM);
184
185	host1x_bo_init(&bo->base, &tegra_bo_ops);
186	size = round_up(buf->size, PAGE_SIZE);
187
188	err = drm_gem_object_init(drm, &bo->gem, size);
189	if (err < 0)
190		goto free;
191
192	err = drm_gem_create_mmap_offset(&bo->gem);
193	if (err < 0)
194		goto release;
195
196	attach = dma_buf_attach(buf, drm->dev);
197	if (IS_ERR(attach)) {
198		err = PTR_ERR(attach);
199		goto free_mmap;
200	}
201
202	get_dma_buf(buf);
203
204	bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
205	if (!bo->sgt) {
206		err = -ENOMEM;
207		goto detach;
208	}
209
210	if (IS_ERR(bo->sgt)) {
211		err = PTR_ERR(bo->sgt);
212		goto detach;
213	}
214
215	if (bo->sgt->nents > 1) {
216		err = -EINVAL;
217		goto detach;
218	}
219
220	bo->paddr = sg_dma_address(bo->sgt->sgl);
221	bo->gem.import_attach = attach;
222
223	return bo;
224
225detach:
226	if (!IS_ERR_OR_NULL(bo->sgt))
227		dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
228
229	dma_buf_detach(buf, attach);
230	dma_buf_put(buf);
231free_mmap:
232	drm_gem_free_mmap_offset(&bo->gem);
233release:
234	drm_gem_object_release(&bo->gem);
235free:
236	kfree(bo);
237
238	return ERR_PTR(err);
239}
240
241void tegra_bo_free_object(struct drm_gem_object *gem)
242{
243	struct tegra_bo *bo = to_tegra_bo(gem);
244
245	if (gem->import_attach) {
246		dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
247					 DMA_TO_DEVICE);
248		drm_prime_gem_destroy(gem, NULL);
249	} else {
250		tegra_bo_destroy(gem->dev, bo);
251	}
252
253	drm_gem_free_mmap_offset(gem);
254	drm_gem_object_release(gem);
255
256	kfree(bo);
257}
258
259int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
260			 struct drm_mode_create_dumb *args)
261{
262	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
263	struct tegra_drm *tegra = drm->dev_private;
264	struct tegra_bo *bo;
265
266	min_pitch = round_up(min_pitch, tegra->pitch_align);
267	if (args->pitch < min_pitch)
268		args->pitch = min_pitch;
269
270	if (args->size < args->pitch * args->height)
271		args->size = args->pitch * args->height;
272
273	bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
274					 &args->handle);
275	if (IS_ERR(bo))
276		return PTR_ERR(bo);
277
278	return 0;
279}
280
281int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
282			     uint32_t handle, uint64_t *offset)
283{
284	struct drm_gem_object *gem;
285	struct tegra_bo *bo;
286
287	mutex_lock(&drm->struct_mutex);
288
289	gem = drm_gem_object_lookup(drm, file, handle);
290	if (!gem) {
291		dev_err(drm->dev, "failed to lookup GEM object\n");
292		mutex_unlock(&drm->struct_mutex);
293		return -EINVAL;
294	}
295
296	bo = to_tegra_bo(gem);
297
298	*offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
299
300	drm_gem_object_unreference(gem);
301
302	mutex_unlock(&drm->struct_mutex);
303
304	return 0;
305}
306
307const struct vm_operations_struct tegra_bo_vm_ops = {
308	.open = drm_gem_vm_open,
309	.close = drm_gem_vm_close,
310};
311
312int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
313{
314	struct drm_gem_object *gem;
315	struct tegra_bo *bo;
316	int ret;
317
318	ret = drm_gem_mmap(file, vma);
319	if (ret)
320		return ret;
321
322	gem = vma->vm_private_data;
323	bo = to_tegra_bo(gem);
324
325	ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
326			      vma->vm_end - vma->vm_start, vma->vm_page_prot);
327	if (ret)
328		drm_gem_vm_close(vma);
329
330	return ret;
331}
332
333static struct sg_table *
334tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
335			    enum dma_data_direction dir)
336{
337	struct drm_gem_object *gem = attach->dmabuf->priv;
338	struct tegra_bo *bo = to_tegra_bo(gem);
339	struct sg_table *sgt;
340
341	sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
342	if (!sgt)
343		return NULL;
344
345	if (sg_alloc_table(sgt, 1, GFP_KERNEL)) {
346		kfree(sgt);
347		return NULL;
348	}
349
350	sg_dma_address(sgt->sgl) = bo->paddr;
351	sg_dma_len(sgt->sgl) = gem->size;
352
353	return sgt;
354}
355
356static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
357					  struct sg_table *sgt,
358					  enum dma_data_direction dir)
359{
360	sg_free_table(sgt);
361	kfree(sgt);
362}
363
364static void tegra_gem_prime_release(struct dma_buf *buf)
365{
366	drm_gem_dmabuf_release(buf);
367}
368
369static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
370					 unsigned long page)
371{
372	return NULL;
373}
374
375static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
376					  unsigned long page,
377					  void *addr)
378{
379}
380
381static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
382{
383	return NULL;
384}
385
386static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
387				   void *addr)
388{
389}
390
391static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
392{
393	return -EINVAL;
394}
395
396static void *tegra_gem_prime_vmap(struct dma_buf *buf)
397{
398	struct drm_gem_object *gem = buf->priv;
399	struct tegra_bo *bo = to_tegra_bo(gem);
400
401	return bo->vaddr;
402}
403
404static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
405{
406}
407
408static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
409	.map_dma_buf = tegra_gem_prime_map_dma_buf,
410	.unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
411	.release = tegra_gem_prime_release,
412	.kmap_atomic = tegra_gem_prime_kmap_atomic,
413	.kunmap_atomic = tegra_gem_prime_kunmap_atomic,
414	.kmap = tegra_gem_prime_kmap,
415	.kunmap = tegra_gem_prime_kunmap,
416	.mmap = tegra_gem_prime_mmap,
417	.vmap = tegra_gem_prime_vmap,
418	.vunmap = tegra_gem_prime_vunmap,
419};
420
421struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
422				       struct drm_gem_object *gem,
423				       int flags)
424{
425	return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size,
426			      flags, NULL);
427}
428
429struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
430					      struct dma_buf *buf)
431{
432	struct tegra_bo *bo;
433
434	if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
435		struct drm_gem_object *gem = buf->priv;
436
437		if (gem->dev == drm) {
438			drm_gem_object_reference(gem);
439			return gem;
440		}
441	}
442
443	bo = tegra_bo_import(drm, buf);
444	if (IS_ERR(bo))
445		return ERR_CAST(bo);
446
447	return &bo->gem;
448}
449