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_framebuffer.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
check_fb_gem_memory_type(struct drm_device * drm_dev,struct exynos_drm_gem * exynos_gem)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 *
exynos_drm_framebuffer_init(struct drm_device * dev,const struct drm_mode_fb_cmd2 * mode_cmd,struct exynos_drm_gem ** exynos_gem,int count)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 *
exynos_user_fb_create(struct drm_device * dev,struct drm_file * file_priv,const struct drm_mode_fb_cmd2 * mode_cmd)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
exynos_drm_fb_dma_addr(struct drm_framebuffer * fb,int index)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 .atomic_check = drm_atomic_helper_check,
160 .atomic_commit = drm_atomic_helper_commit,
161 };
162
exynos_drm_mode_config_init(struct drm_device * dev)163 void exynos_drm_mode_config_init(struct drm_device *dev)
164 {
165 dev->mode_config.min_width = 0;
166 dev->mode_config.min_height = 0;
167
168 /*
169 * set max width and height as default value(4096x4096).
170 * this value would be used to check framebuffer size limitation
171 * at drm_mode_addfb().
172 */
173 dev->mode_config.max_width = 4096;
174 dev->mode_config.max_height = 4096;
175
176 dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
177 dev->mode_config.helper_private = &exynos_drm_mode_config_helpers;
178
179 dev->mode_config.normalize_zpos = true;
180 }
181