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
25static 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
52static 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
57struct drm_framebuffer *
58exynos_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
90err:
91	kfree(fb);
92	return ERR_PTR(ret);
93}
94
95static struct drm_framebuffer *
96exynos_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
135err:
136	while (i--)
137		exynos_drm_gem_put(exynos_gem[i]);
138
139	return ERR_PTR(ret);
140}
141
142dma_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
153static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = {
154	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
155};
156
157static 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
163void 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