summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/exynos/exynos_drm_fb.c
blob: 8208df56a88f7f9fcc6b82ff6b1fc1f569671e9e (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
/* exynos_drm_fb.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Authors:
 *	Inki Dae <inki.dae@samsung.com>
 *	Joonyoung Shim <jy0922.shim@samsung.com>
 *	Seung-Woo Kim <sw0312.kim@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <uapi/drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_fbdev.h"
#include "exynos_drm_iommu.h"
#include "exynos_drm_crtc.h"

#define to_exynos_fb(x)	container_of(x, struct exynos_drm_fb, fb)

/*
 * exynos specific framebuffer structure.
 *
 * @fb: drm framebuffer obejct.
 * @exynos_gem: array of exynos specific gem object containing a gem object.
 */
struct exynos_drm_fb {
	struct drm_framebuffer	fb;
	struct exynos_drm_gem	*exynos_gem[MAX_FB_BUFFER];
	dma_addr_t			dma_addr[MAX_FB_BUFFER];
};

static int check_fb_gem_memory_type(struct drm_device *drm_dev,
				    struct exynos_drm_gem *exynos_gem)
{
	unsigned int flags;

	/*
	 * if exynos drm driver supports iommu then framebuffer can use
	 * all the buffer types.
	 */
	if (is_drm_iommu_supported(drm_dev))
		return 0;

	flags = exynos_gem->flags;

	/*
	 * Physically non-contiguous memory type for framebuffer is not
	 * supported without IOMMU.
	 */
	if (IS_NONCONTIG_BUFFER(flags)) {
		DRM_ERROR("Non-contiguous GEM memory is not supported.\n");
		return -EINVAL;
	}

	return 0;
}

static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
{
	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
	unsigned int i;

	drm_framebuffer_cleanup(fb);

	for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem); i++) {
		struct drm_gem_object *obj;

		if (exynos_fb->exynos_gem[i] == NULL)
			continue;

		obj = &exynos_fb->exynos_gem[i]->base;
		drm_gem_object_unreference_unlocked(obj);
	}

	kfree(exynos_fb);
	exynos_fb = NULL;
}

static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
					struct drm_file *file_priv,
					unsigned int *handle)
{
	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);

	return drm_gem_handle_create(file_priv,
				     &exynos_fb->exynos_gem[0]->base, handle);
}

static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
	.destroy	= exynos_drm_fb_destroy,
	.create_handle	= exynos_drm_fb_create_handle,
};

struct drm_framebuffer *
exynos_drm_framebuffer_init(struct drm_device *dev,
			    const struct drm_mode_fb_cmd2 *mode_cmd,
			    struct exynos_drm_gem **exynos_gem,
			    int count)
{
	struct exynos_drm_fb *exynos_fb;
	int i;
	int ret;

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

	for (i = 0; i < count; i++) {
		ret = check_fb_gem_memory_type(dev, exynos_gem[i]);
		if (ret < 0)
			goto err;

		exynos_fb->exynos_gem[i] = exynos_gem[i];
		exynos_fb->dma_addr[i] = exynos_gem[i]->dma_addr
						+ mode_cmd->offsets[i];
	}

	drm_helper_mode_fill_fb_struct(dev, &exynos_fb->fb, mode_cmd);

	ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
	if (ret < 0) {
		DRM_ERROR("failed to initialize framebuffer\n");
		goto err;
	}

	return &exynos_fb->fb;

err:
	kfree(exynos_fb);
	return ERR_PTR(ret);
}

static struct drm_framebuffer *
exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
		      const struct drm_mode_fb_cmd2 *mode_cmd)
{
	const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd);
	struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER];
	struct drm_gem_object *obj;
	struct drm_framebuffer *fb;
	int i;
	int ret;

	for (i = 0; i < info->num_planes; i++) {
		unsigned int height = (i == 0) ? mode_cmd->height :
				     DIV_ROUND_UP(mode_cmd->height, info->vsub);
		unsigned long size = height * mode_cmd->pitches[i] +
				     mode_cmd->offsets[i];

		obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
		if (!obj) {
			DRM_ERROR("failed to lookup gem object\n");
			ret = -ENOENT;
			goto err;
		}

		exynos_gem[i] = to_exynos_gem(obj);

		if (size > exynos_gem[i]->size) {
			i++;
			ret = -EINVAL;
			goto err;
		}
	}

	fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
	if (IS_ERR(fb)) {
		ret = PTR_ERR(fb);
		goto err;
	}

	return fb;

err:
	while (i--)
		drm_gem_object_unreference_unlocked(&exynos_gem[i]->base);

	return ERR_PTR(ret);
}

dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
{
	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);

	if (WARN_ON_ONCE(index >= MAX_FB_BUFFER))
		return 0;

	return exynos_fb->dma_addr[index];
}

static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = {
	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
};

static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
	.fb_create = exynos_user_fb_create,
	.output_poll_changed = exynos_drm_output_poll_changed,
	.atomic_check = exynos_atomic_check,
	.atomic_commit = drm_atomic_helper_commit,
};

void exynos_drm_mode_config_init(struct drm_device *dev)
{
	dev->mode_config.min_width = 0;
	dev->mode_config.min_height = 0;

	/*
	 * set max width and height as default value(4096x4096).
	 * this value would be used to check framebuffer size limitation
	 * at drm_mode_addfb().
	 */
	dev->mode_config.max_width = 4096;
	dev->mode_config.max_height = 4096;

	dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
	dev->mode_config.helper_private = &exynos_drm_mode_config_helpers;

	dev->mode_config.allow_fb_modifiers = true;
}