summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/mediatek/mtk_drm_gem.c
blob: d0544962cfc1a06a4e0b087275919a7dd88f4584 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015 MediaTek Inc.
 */

#include <linux/dma-buf.h>

#include <drm/drm.h>
#include <drm/drm_device.h>
#include <drm/drm_gem.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_prime.h>

#include "mtk_drm_drv.h"
#include "mtk_drm_gem.h"

static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);

static const struct drm_gem_object_funcs mtk_drm_gem_object_funcs = {
	.free = mtk_drm_gem_free_object,
	.get_sg_table = mtk_gem_prime_get_sg_table,
	.vmap = mtk_drm_gem_prime_vmap,
	.vunmap = mtk_drm_gem_prime_vunmap,
	.mmap = mtk_drm_gem_object_mmap,
	.vm_ops = &drm_gem_cma_vm_ops,
};

static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
						unsigned long size)
{
	struct mtk_drm_gem_obj *mtk_gem_obj;
	int ret;

	size = round_up(size, PAGE_SIZE);

	mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
	if (!mtk_gem_obj)
		return ERR_PTR(-ENOMEM);

	mtk_gem_obj->base.funcs = &mtk_drm_gem_object_funcs;

	ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
	if (ret < 0) {
		DRM_ERROR("failed to initialize gem object\n");
		kfree(mtk_gem_obj);
		return ERR_PTR(ret);
	}

	return mtk_gem_obj;
}

struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
					   size_t size, bool alloc_kmap)
{
	struct mtk_drm_private *priv = dev->dev_private;
	struct mtk_drm_gem_obj *mtk_gem;
	struct drm_gem_object *obj;
	int ret;

	mtk_gem = mtk_drm_gem_init(dev, size);
	if (IS_ERR(mtk_gem))
		return ERR_CAST(mtk_gem);

	obj = &mtk_gem->base;

	mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;

	if (!alloc_kmap)
		mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;

	mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
					  &mtk_gem->dma_addr, GFP_KERNEL,
					  mtk_gem->dma_attrs);
	if (!mtk_gem->cookie) {
		DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
		ret = -ENOMEM;
		goto err_gem_free;
	}

	if (alloc_kmap)
		mtk_gem->kvaddr = mtk_gem->cookie;

	DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
			 mtk_gem->cookie, &mtk_gem->dma_addr,
			 size);

	return mtk_gem;

err_gem_free:
	drm_gem_object_release(obj);
	kfree(mtk_gem);
	return ERR_PTR(ret);
}

void mtk_drm_gem_free_object(struct drm_gem_object *obj)
{
	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	struct mtk_drm_private *priv = obj->dev->dev_private;

	if (mtk_gem->sg)
		drm_prime_gem_destroy(obj, mtk_gem->sg);
	else
		dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
			       mtk_gem->dma_addr, mtk_gem->dma_attrs);

	/* release file pointer to gem object. */
	drm_gem_object_release(obj);

	kfree(mtk_gem);
}

int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
			    struct drm_mode_create_dumb *args)
{
	struct mtk_drm_gem_obj *mtk_gem;
	int ret;

	args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
	args->size = args->pitch * args->height;

	mtk_gem = mtk_drm_gem_create(dev, args->size, false);
	if (IS_ERR(mtk_gem))
		return PTR_ERR(mtk_gem);

	/*
	 * allocate a id of idr table where the obj is registered
	 * and handle has the id what user can see.
	 */
	ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
	if (ret)
		goto err_handle_create;

	/* drop reference from allocate - handle holds it now. */
	drm_gem_object_put(&mtk_gem->base);

	return 0;

err_handle_create:
	mtk_drm_gem_free_object(&mtk_gem->base);
	return ret;
}

static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
				   struct vm_area_struct *vma)

{
	int ret;
	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	struct mtk_drm_private *priv = obj->dev->dev_private;

	/*
	 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
	 * whole buffer from the start.
	 */
	vma->vm_pgoff = 0;

	/*
	 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
	 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
	 */
	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
	vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);

	ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
			     mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
	if (ret)
		drm_gem_vm_close(vma);

	return ret;
}

/*
 * Allocate a sg_table for this GEM object.
 * Note: Both the table's contents, and the sg_table itself must be freed by
 *       the caller.
 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
 */
struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	struct mtk_drm_private *priv = obj->dev->dev_private;
	struct sg_table *sgt;
	int ret;

	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
	if (!sgt)
		return ERR_PTR(-ENOMEM);

	ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
				    mtk_gem->dma_addr, obj->size,
				    mtk_gem->dma_attrs);
	if (ret) {
		DRM_ERROR("failed to allocate sgt, %d\n", ret);
		kfree(sgt);
		return ERR_PTR(ret);
	}

	return sgt;
}

struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
			struct dma_buf_attachment *attach, struct sg_table *sg)
{
	struct mtk_drm_gem_obj *mtk_gem;

	/* check if the entries in the sg_table are contiguous */
	if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
		DRM_ERROR("sg_table is not contiguous");
		return ERR_PTR(-EINVAL);
	}

	mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
	if (IS_ERR(mtk_gem))
		return ERR_CAST(mtk_gem);

	mtk_gem->dma_addr = sg_dma_address(sg->sgl);
	mtk_gem->sg = sg;

	return &mtk_gem->base;
}

int mtk_drm_gem_prime_vmap(struct drm_gem_object *obj, struct dma_buf_map *map)
{
	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	struct sg_table *sgt = NULL;
	unsigned int npages;

	if (mtk_gem->kvaddr)
		goto out;

	sgt = mtk_gem_prime_get_sg_table(obj);
	if (IS_ERR(sgt))
		return PTR_ERR(sgt);

	npages = obj->size >> PAGE_SHIFT;
	mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
	if (!mtk_gem->pages) {
		kfree(sgt);
		return -ENOMEM;
	}

	drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages);

	mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
			       pgprot_writecombine(PAGE_KERNEL));

out:
	kfree(sgt);
	dma_buf_map_set_vaddr(map, mtk_gem->kvaddr);

	return 0;
}

void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map)
{
	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	void *vaddr = map->vaddr;

	if (!mtk_gem->pages)
		return;

	vunmap(vaddr);
	mtk_gem->kvaddr = 0;
	kfree(mtk_gem->pages);
}