exynos_drm_fb.c

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