summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/exynos/exynos_drm_fb.c
blob: 142eb4e3f59ea5501805cc56bed7cbef4106ae7b (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
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
/* 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 <uapi/drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_fbdev.h"
#include "exynos_drm_gem.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.
 * @buf_cnt: a buffer count to drm framebuffer.
 * @exynos_gem_obj: array of exynos specific gem object containing a gem object.
 */
struct exynos_drm_fb {
	struct drm_framebuffer		fb;
	unsigned int			buf_cnt;
	struct exynos_drm_gem_obj	*exynos_gem_obj[MAX_FB_BUFFER];
};

static int check_fb_gem_memory_type(struct drm_device *drm_dev,
				struct exynos_drm_gem_obj *exynos_gem_obj)
{
	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_obj->flags;

	/*
	 * without iommu support, not support physically non-continuous memory
	 * for framebuffer.
	 */
	if (IS_NONCONTIG_BUFFER(flags)) {
		DRM_ERROR("cannot use this gem memory type for fb.\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;

	/* make sure that overlay data are updated before relesing fb. */
	exynos_drm_crtc_complete_scanout(fb);

	drm_framebuffer_cleanup(fb);

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

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

		obj = &exynos_fb->exynos_gem_obj[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);

	/* This fb should have only one gem object. */
	if (WARN_ON(exynos_fb->buf_cnt != 1))
		return -EINVAL;

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

static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
				struct drm_file *file_priv, unsigned flags,
				unsigned color, struct drm_clip_rect *clips,
				unsigned num_clips)
{
	/* TODO */

	return 0;
}

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

void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb,
						unsigned int cnt)
{
	struct exynos_drm_fb *exynos_fb;

	exynos_fb = to_exynos_fb(fb);

	exynos_fb->buf_cnt = cnt;
}

unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
{
	struct exynos_drm_fb *exynos_fb;

	exynos_fb = to_exynos_fb(fb);

	return exynos_fb->buf_cnt;
}

struct drm_framebuffer *
exynos_drm_framebuffer_init(struct drm_device *dev,
			    struct drm_mode_fb_cmd2 *mode_cmd,
			    struct drm_gem_object *obj)
{
	struct exynos_drm_fb *exynos_fb;
	struct exynos_drm_gem_obj *exynos_gem_obj;
	int ret;

	exynos_gem_obj = to_exynos_gem_obj(obj);

	ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
	if (ret < 0)
		return ERR_PTR(ret);

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

	drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
	exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;

	ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
	if (ret) {
		kfree(exynos_fb);
		DRM_ERROR("failed to initialize framebuffer\n");
		return ERR_PTR(ret);
	}

	return &exynos_fb->fb;
}

static struct drm_framebuffer *
exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
		      struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_gem_object *obj;
	struct exynos_drm_gem_obj *exynos_gem_obj;
	struct exynos_drm_fb *exynos_fb;
	int i, ret;

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

	obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object\n");
		ret = -ENOENT;
		goto err_free;
	}

	drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
	exynos_fb->exynos_gem_obj[0] = to_exynos_gem_obj(obj);
	exynos_fb->buf_cnt = drm_format_num_planes(mode_cmd->pixel_format);

	DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);

	for (i = 1; i < exynos_fb->buf_cnt; i++) {
		obj = drm_gem_object_lookup(dev, file_priv,
				mode_cmd->handles[i]);
		if (!obj) {
			DRM_ERROR("failed to lookup gem object\n");
			ret = -ENOENT;
			exynos_fb->buf_cnt = i;
			goto err_unreference;
		}

		exynos_gem_obj = to_exynos_gem_obj(obj);
		exynos_fb->exynos_gem_obj[i] = exynos_gem_obj;

		ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
		if (ret < 0)
			goto err_unreference;
	}

	ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
	if (ret) {
		DRM_ERROR("failed to init framebuffer.\n");
		goto err_unreference;
	}

	return &exynos_fb->fb;

err_unreference:
	for (i = 0; i < exynos_fb->buf_cnt; i++) {
		struct drm_gem_object *obj;

		obj = &exynos_fb->exynos_gem_obj[i]->base;
		if (obj)
			drm_gem_object_unreference_unlocked(obj);
	}
err_free:
	kfree(exynos_fb);
	return ERR_PTR(ret);
}

struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb,
						int index)
{
	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
	struct exynos_drm_gem_buf *buffer;

	if (index >= MAX_FB_BUFFER)
		return NULL;

	buffer = exynos_fb->exynos_gem_obj[index]->buffer;
	if (!buffer)
		return NULL;

	DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)buffer->dma_addr);

	return buffer;
}

static void exynos_drm_output_poll_changed(struct drm_device *dev)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct drm_fb_helper *fb_helper = private->fb_helper;

	if (fb_helper)
		drm_fb_helper_hotplug_event(fb_helper);
	else
		exynos_drm_fbdev_init(dev);
}

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,
};

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;
}