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_crtc.h> 17 #include <drm/drm_crtc_helper.h> 18 #include <drm/drm_fb_helper.h> 19 #include <drm/drm_atomic.h> 20 #include <drm/drm_atomic_helper.h> 21 #include <uapi/drm/exynos_drm.h> 22 23 #include "exynos_drm_drv.h" 24 #include "exynos_drm_fb.h" 25 #include "exynos_drm_fbdev.h" 26 #include "exynos_drm_iommu.h" 27 #include "exynos_drm_crtc.h" 28 29 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb) 30 31 /* 32 * exynos specific framebuffer structure. 33 * 34 * @fb: drm framebuffer obejct. 35 * @exynos_gem: array of exynos specific gem object containing a gem object. 36 */ 37 struct exynos_drm_fb { 38 struct drm_framebuffer fb; 39 struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER]; 40 }; 41 42 static int check_fb_gem_memory_type(struct drm_device *drm_dev, 43 struct exynos_drm_gem *exynos_gem) 44 { 45 unsigned int flags; 46 47 /* 48 * if exynos drm driver supports iommu then framebuffer can use 49 * all the buffer types. 50 */ 51 if (is_drm_iommu_supported(drm_dev)) 52 return 0; 53 54 flags = exynos_gem->flags; 55 56 /* 57 * without iommu support, not support physically non-continuous memory 58 * for framebuffer. 59 */ 60 if (IS_NONCONTIG_BUFFER(flags)) { 61 DRM_ERROR("cannot use this gem memory type for fb.\n"); 62 return -EINVAL; 63 } 64 65 return 0; 66 } 67 68 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb) 69 { 70 struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb); 71 unsigned int i; 72 73 /* make sure that overlay data are updated before relesing fb. */ 74 exynos_drm_crtc_complete_scanout(fb); 75 76 drm_framebuffer_cleanup(fb); 77 78 for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem); i++) { 79 struct drm_gem_object *obj; 80 81 if (exynos_fb->exynos_gem[i] == NULL) 82 continue; 83 84 obj = &exynos_fb->exynos_gem[i]->base; 85 drm_gem_object_unreference_unlocked(obj); 86 } 87 88 kfree(exynos_fb); 89 exynos_fb = NULL; 90 } 91 92 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb, 93 struct drm_file *file_priv, 94 unsigned int *handle) 95 { 96 struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb); 97 98 return drm_gem_handle_create(file_priv, 99 &exynos_fb->exynos_gem[0]->base, handle); 100 } 101 102 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb, 103 struct drm_file *file_priv, unsigned flags, 104 unsigned color, struct drm_clip_rect *clips, 105 unsigned num_clips) 106 { 107 /* TODO */ 108 109 return 0; 110 } 111 112 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = { 113 .destroy = exynos_drm_fb_destroy, 114 .create_handle = exynos_drm_fb_create_handle, 115 .dirty = exynos_drm_fb_dirty, 116 }; 117 118 struct drm_framebuffer * 119 exynos_drm_framebuffer_init(struct drm_device *dev, 120 struct drm_mode_fb_cmd2 *mode_cmd, 121 struct exynos_drm_gem **exynos_gem, 122 int count) 123 { 124 struct exynos_drm_fb *exynos_fb; 125 int i; 126 int ret; 127 128 exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL); 129 if (!exynos_fb) 130 return ERR_PTR(-ENOMEM); 131 132 for (i = 0; i < count; i++) { 133 ret = check_fb_gem_memory_type(dev, exynos_gem[i]); 134 if (ret < 0) 135 goto err; 136 137 exynos_fb->exynos_gem[i] = exynos_gem[i]; 138 } 139 140 drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd); 141 142 ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs); 143 if (ret < 0) { 144 DRM_ERROR("failed to initialize framebuffer\n"); 145 goto err; 146 } 147 148 return &exynos_fb->fb; 149 150 err: 151 kfree(exynos_fb); 152 return ERR_PTR(ret); 153 } 154 155 static struct drm_framebuffer * 156 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv, 157 struct drm_mode_fb_cmd2 *mode_cmd) 158 { 159 struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER]; 160 struct drm_gem_object *obj; 161 struct drm_framebuffer *fb; 162 int i; 163 int ret; 164 165 for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) { 166 obj = drm_gem_object_lookup(dev, file_priv, 167 mode_cmd->handles[i]); 168 if (!obj) { 169 DRM_ERROR("failed to lookup gem object\n"); 170 ret = -ENOENT; 171 goto err; 172 } 173 174 exynos_gem[i] = to_exynos_gem(obj); 175 } 176 177 fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i); 178 if (IS_ERR(fb)) { 179 ret = PTR_ERR(fb); 180 goto err; 181 } 182 183 return fb; 184 185 err: 186 while (i--) 187 drm_gem_object_unreference_unlocked(&exynos_gem[i]->base); 188 189 return ERR_PTR(ret); 190 } 191 192 struct exynos_drm_gem *exynos_drm_fb_gem(struct drm_framebuffer *fb, int index) 193 { 194 struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb); 195 struct exynos_drm_gem *exynos_gem; 196 197 if (index >= MAX_FB_BUFFER) 198 return NULL; 199 200 exynos_gem = exynos_fb->exynos_gem[index]; 201 if (!exynos_gem) 202 return NULL; 203 204 DRM_DEBUG_KMS("dma_addr: 0x%lx\n", (unsigned long)exynos_gem->dma_addr); 205 206 return exynos_gem; 207 } 208 209 static void exynos_drm_output_poll_changed(struct drm_device *dev) 210 { 211 struct exynos_drm_private *private = dev->dev_private; 212 struct drm_fb_helper *fb_helper = private->fb_helper; 213 214 if (fb_helper) 215 drm_fb_helper_hotplug_event(fb_helper); 216 else 217 exynos_drm_fbdev_init(dev); 218 } 219 220 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = { 221 .fb_create = exynos_user_fb_create, 222 .output_poll_changed = exynos_drm_output_poll_changed, 223 .atomic_check = drm_atomic_helper_check, 224 .atomic_commit = exynos_atomic_commit, 225 }; 226 227 void exynos_drm_mode_config_init(struct drm_device *dev) 228 { 229 dev->mode_config.min_width = 0; 230 dev->mode_config.min_height = 0; 231 232 /* 233 * set max width and height as default value(4096x4096). 234 * this value would be used to check framebuffer size limitation 235 * at drm_mode_addfb(). 236 */ 237 dev->mode_config.max_width = 4096; 238 dev->mode_config.max_height = 4096; 239 240 dev->mode_config.funcs = &exynos_drm_mode_config_funcs; 241 } 242