1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* exynos_drm_fb.c
3  *
4  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5  * Authors:
6  *	Inki Dae <inki.dae@samsung.com>
7  *	Joonyoung Shim <jy0922.shim@samsung.com>
8  *	Seung-Woo Kim <sw0312.kim@samsung.com>
9  */
10 
11 #include <drm/drm_atomic.h>
12 #include <drm/drm_atomic_helper.h>
13 #include <drm/drm_crtc.h>
14 #include <drm/drm_fb_helper.h>
15 #include <drm/drm_fourcc.h>
16 #include <drm/drm_gem_framebuffer_helper.h>
17 #include <drm/drm_probe_helper.h>
18 #include <drm/exynos_drm.h>
19 
20 #include "exynos_drm_crtc.h"
21 #include "exynos_drm_drv.h"
22 #include "exynos_drm_fb.h"
23 #include "exynos_drm_fbdev.h"
24 
25 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
26 				    struct exynos_drm_gem *exynos_gem)
27 {
28 	unsigned int flags;
29 
30 	/*
31 	 * if exynos drm driver supports iommu then framebuffer can use
32 	 * all the buffer types.
33 	 */
34 	if (is_drm_iommu_supported(drm_dev))
35 		return 0;
36 
37 	flags = exynos_gem->flags;
38 
39 	/*
40 	 * Physically non-contiguous memory type for framebuffer is not
41 	 * supported without IOMMU.
42 	 */
43 	if (IS_NONCONTIG_BUFFER(flags)) {
44 		DRM_DEV_ERROR(drm_dev->dev,
45 			      "Non-contiguous GEM memory is not supported.\n");
46 		return -EINVAL;
47 	}
48 
49 	return 0;
50 }
51 
52 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
53 	.destroy	= drm_gem_fb_destroy,
54 	.create_handle	= drm_gem_fb_create_handle,
55 };
56 
57 struct drm_framebuffer *
58 exynos_drm_framebuffer_init(struct drm_device *dev,
59 			    const struct drm_mode_fb_cmd2 *mode_cmd,
60 			    struct exynos_drm_gem **exynos_gem,
61 			    int count)
62 {
63 	struct drm_framebuffer *fb;
64 	int i;
65 	int ret;
66 
67 	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
68 	if (!fb)
69 		return ERR_PTR(-ENOMEM);
70 
71 	for (i = 0; i < count; i++) {
72 		ret = check_fb_gem_memory_type(dev, exynos_gem[i]);
73 		if (ret < 0)
74 			goto err;
75 
76 		fb->obj[i] = &exynos_gem[i]->base;
77 	}
78 
79 	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
80 
81 	ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs);
82 	if (ret < 0) {
83 		DRM_DEV_ERROR(dev->dev,
84 			      "failed to initialize framebuffer\n");
85 		goto err;
86 	}
87 
88 	return fb;
89 
90 err:
91 	kfree(fb);
92 	return ERR_PTR(ret);
93 }
94 
95 static struct drm_framebuffer *
96 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
97 		      const struct drm_mode_fb_cmd2 *mode_cmd)
98 {
99 	const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd);
100 	struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER];
101 	struct drm_framebuffer *fb;
102 	int i;
103 	int ret;
104 
105 	for (i = 0; i < info->num_planes; i++) {
106 		unsigned int height = (i == 0) ? mode_cmd->height :
107 				     DIV_ROUND_UP(mode_cmd->height, info->vsub);
108 		unsigned long size = height * mode_cmd->pitches[i] +
109 				     mode_cmd->offsets[i];
110 
111 		exynos_gem[i] = exynos_drm_gem_get(file_priv,
112 						   mode_cmd->handles[i]);
113 		if (!exynos_gem[i]) {
114 			DRM_DEV_ERROR(dev->dev,
115 				      "failed to lookup gem object\n");
116 			ret = -ENOENT;
117 			goto err;
118 		}
119 
120 		if (size > exynos_gem[i]->size) {
121 			i++;
122 			ret = -EINVAL;
123 			goto err;
124 		}
125 	}
126 
127 	fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
128 	if (IS_ERR(fb)) {
129 		ret = PTR_ERR(fb);
130 		goto err;
131 	}
132 
133 	return fb;
134 
135 err:
136 	while (i--)
137 		exynos_drm_gem_put(exynos_gem[i]);
138 
139 	return ERR_PTR(ret);
140 }
141 
142 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
143 {
144 	struct exynos_drm_gem *exynos_gem;
145 
146 	if (WARN_ON_ONCE(index >= MAX_FB_BUFFER))
147 		return 0;
148 
149 	exynos_gem = to_exynos_gem(fb->obj[index]);
150 	return exynos_gem->dma_addr + fb->offsets[index];
151 }
152 
153 static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = {
154 	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
155 };
156 
157 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
158 	.fb_create = exynos_user_fb_create,
159 	.output_poll_changed = drm_fb_helper_output_poll_changed,
160 	.atomic_check = drm_atomic_helper_check,
161 	.atomic_commit = drm_atomic_helper_commit,
162 };
163 
164 void exynos_drm_mode_config_init(struct drm_device *dev)
165 {
166 	dev->mode_config.min_width = 0;
167 	dev->mode_config.min_height = 0;
168 
169 	/*
170 	 * set max width and height as default value(4096x4096).
171 	 * this value would be used to check framebuffer size limitation
172 	 * at drm_mode_addfb().
173 	 */
174 	dev->mode_config.max_width = 4096;
175 	dev->mode_config.max_height = 4096;
176 
177 	dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
178 	dev->mode_config.helper_private = &exynos_drm_mode_config_helpers;
179 
180 	dev->mode_config.normalize_zpos = true;
181 }
182