1 /* exynos_drm_fb.c 2 * 3 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 4 * Authors: 5 * Inki Dae <inki.dae@samsung.com> 6 * Joonyoung Shim <jy0922.shim@samsung.com> 7 * Seung-Woo Kim <sw0312.kim@samsung.com> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 */ 14 15 #include <drm/drmP.h> 16 #include <drm/drm_atomic.h> 17 #include <drm/drm_atomic_helper.h> 18 #include <drm/drm_crtc.h> 19 #include <drm/drm_fb_helper.h> 20 #include <drm/drm_gem_framebuffer_helper.h> 21 #include <drm/drm_probe_helper.h> 22 #include <uapi/drm/exynos_drm.h> 23 24 #include "exynos_drm_drv.h" 25 #include "exynos_drm_fb.h" 26 #include "exynos_drm_fbdev.h" 27 #include "exynos_drm_crtc.h" 28 29 static int check_fb_gem_memory_type(struct drm_device *drm_dev, 30 struct exynos_drm_gem *exynos_gem) 31 { 32 unsigned int flags; 33 34 /* 35 * if exynos drm driver supports iommu then framebuffer can use 36 * all the buffer types. 37 */ 38 if (is_drm_iommu_supported(drm_dev)) 39 return 0; 40 41 flags = exynos_gem->flags; 42 43 /* 44 * Physically non-contiguous memory type for framebuffer is not 45 * supported without IOMMU. 46 */ 47 if (IS_NONCONTIG_BUFFER(flags)) { 48 DRM_ERROR("Non-contiguous GEM memory is not supported.\n"); 49 return -EINVAL; 50 } 51 52 return 0; 53 } 54 55 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = { 56 .destroy = drm_gem_fb_destroy, 57 .create_handle = drm_gem_fb_create_handle, 58 }; 59 60 struct drm_framebuffer * 61 exynos_drm_framebuffer_init(struct drm_device *dev, 62 const struct drm_mode_fb_cmd2 *mode_cmd, 63 struct exynos_drm_gem **exynos_gem, 64 int count) 65 { 66 struct drm_framebuffer *fb; 67 int i; 68 int ret; 69 70 fb = kzalloc(sizeof(*fb), GFP_KERNEL); 71 if (!fb) 72 return ERR_PTR(-ENOMEM); 73 74 for (i = 0; i < count; i++) { 75 ret = check_fb_gem_memory_type(dev, exynos_gem[i]); 76 if (ret < 0) 77 goto err; 78 79 fb->obj[i] = &exynos_gem[i]->base; 80 } 81 82 drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd); 83 84 ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs); 85 if (ret < 0) { 86 DRM_ERROR("failed to initialize framebuffer\n"); 87 goto err; 88 } 89 90 return fb; 91 92 err: 93 kfree(fb); 94 return ERR_PTR(ret); 95 } 96 97 static struct drm_framebuffer * 98 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv, 99 const struct drm_mode_fb_cmd2 *mode_cmd) 100 { 101 const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd); 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_ERROR("failed to lookup gem object\n"); 117 ret = -ENOENT; 118 goto err; 119 } 120 121 if (size > exynos_gem[i]->size) { 122 i++; 123 ret = -EINVAL; 124 goto err; 125 } 126 } 127 128 fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i); 129 if (IS_ERR(fb)) { 130 ret = PTR_ERR(fb); 131 goto err; 132 } 133 134 return fb; 135 136 err: 137 while (i--) 138 exynos_drm_gem_put(exynos_gem[i]); 139 140 return ERR_PTR(ret); 141 } 142 143 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index) 144 { 145 struct exynos_drm_gem *exynos_gem; 146 147 if (WARN_ON_ONCE(index >= MAX_FB_BUFFER)) 148 return 0; 149 150 exynos_gem = to_exynos_gem(fb->obj[index]); 151 return exynos_gem->dma_addr + fb->offsets[index]; 152 } 153 154 static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = { 155 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 156 }; 157 158 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = { 159 .fb_create = exynos_user_fb_create, 160 .output_poll_changed = drm_fb_helper_output_poll_changed, 161 .atomic_check = drm_atomic_helper_check, 162 .atomic_commit = drm_atomic_helper_commit, 163 }; 164 165 void 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.allow_fb_modifiers = true; 182 183 dev->mode_config.normalize_zpos = true; 184 } 185