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 <uapi/drm/exynos_drm.h> 20 21 #include "exynos_drm_drv.h" 22 #include "exynos_drm_fb.h" 23 #include "exynos_drm_gem.h" 24 #include "exynos_drm_iommu.h" 25 #include "exynos_drm_encoder.h" 26 27 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb) 28 29 /* 30 * exynos specific framebuffer structure. 31 * 32 * @fb: drm framebuffer obejct. 33 * @buf_cnt: a buffer count to drm framebuffer. 34 * @exynos_gem_obj: array of exynos specific gem object containing a gem object. 35 */ 36 struct exynos_drm_fb { 37 struct drm_framebuffer fb; 38 unsigned int buf_cnt; 39 struct exynos_drm_gem_obj *exynos_gem_obj[MAX_FB_BUFFER]; 40 }; 41 42 static int check_fb_gem_memory_type(struct drm_device *drm_dev, 43 struct exynos_drm_gem_obj *exynos_gem_obj) 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_obj->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 DRM_DEBUG_KMS("%s\n", __FILE__); 74 75 /* make sure that overlay data are updated before relesing fb. */ 76 exynos_drm_encoder_complete_scanout(fb); 77 78 drm_framebuffer_cleanup(fb); 79 80 for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) { 81 struct drm_gem_object *obj; 82 83 if (exynos_fb->exynos_gem_obj[i] == NULL) 84 continue; 85 86 obj = &exynos_fb->exynos_gem_obj[i]->base; 87 drm_gem_object_unreference_unlocked(obj); 88 } 89 90 kfree(exynos_fb); 91 exynos_fb = NULL; 92 } 93 94 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb, 95 struct drm_file *file_priv, 96 unsigned int *handle) 97 { 98 struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb); 99 100 DRM_DEBUG_KMS("%s\n", __FILE__); 101 102 /* This fb should have only one gem object. */ 103 if (WARN_ON(exynos_fb->buf_cnt != 1)) 104 return -EINVAL; 105 106 return drm_gem_handle_create(file_priv, 107 &exynos_fb->exynos_gem_obj[0]->base, handle); 108 } 109 110 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb, 111 struct drm_file *file_priv, unsigned flags, 112 unsigned color, struct drm_clip_rect *clips, 113 unsigned num_clips) 114 { 115 DRM_DEBUG_KMS("%s\n", __FILE__); 116 117 /* TODO */ 118 119 return 0; 120 } 121 122 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = { 123 .destroy = exynos_drm_fb_destroy, 124 .create_handle = exynos_drm_fb_create_handle, 125 .dirty = exynos_drm_fb_dirty, 126 }; 127 128 void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb, 129 unsigned int cnt) 130 { 131 struct exynos_drm_fb *exynos_fb; 132 133 exynos_fb = to_exynos_fb(fb); 134 135 exynos_fb->buf_cnt = cnt; 136 } 137 138 unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb) 139 { 140 struct exynos_drm_fb *exynos_fb; 141 142 exynos_fb = to_exynos_fb(fb); 143 144 return exynos_fb->buf_cnt; 145 } 146 147 struct drm_framebuffer * 148 exynos_drm_framebuffer_init(struct drm_device *dev, 149 struct drm_mode_fb_cmd2 *mode_cmd, 150 struct drm_gem_object *obj) 151 { 152 struct exynos_drm_fb *exynos_fb; 153 struct exynos_drm_gem_obj *exynos_gem_obj; 154 int ret; 155 156 exynos_gem_obj = to_exynos_gem_obj(obj); 157 158 ret = check_fb_gem_memory_type(dev, exynos_gem_obj); 159 if (ret < 0) { 160 DRM_ERROR("cannot use this gem memory type for fb.\n"); 161 return ERR_PTR(-EINVAL); 162 } 163 164 exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL); 165 if (!exynos_fb) { 166 DRM_ERROR("failed to allocate exynos drm framebuffer\n"); 167 return ERR_PTR(-ENOMEM); 168 } 169 170 drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd); 171 exynos_fb->exynos_gem_obj[0] = exynos_gem_obj; 172 173 ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs); 174 if (ret) { 175 DRM_ERROR("failed to initialize framebuffer\n"); 176 return ERR_PTR(ret); 177 } 178 179 return &exynos_fb->fb; 180 } 181 182 static u32 exynos_drm_format_num_buffers(struct drm_mode_fb_cmd2 *mode_cmd) 183 { 184 unsigned int cnt = 0; 185 186 if (mode_cmd->pixel_format != DRM_FORMAT_NV12) 187 return drm_format_num_planes(mode_cmd->pixel_format); 188 189 while (cnt != MAX_FB_BUFFER) { 190 if (!mode_cmd->handles[cnt]) 191 break; 192 cnt++; 193 } 194 195 /* 196 * check if NV12 or NV12M. 197 * 198 * NV12 199 * handles[0] = base1, offsets[0] = 0 200 * handles[1] = base1, offsets[1] = Y_size 201 * 202 * NV12M 203 * handles[0] = base1, offsets[0] = 0 204 * handles[1] = base2, offsets[1] = 0 205 */ 206 if (cnt == 2) { 207 /* 208 * in case of NV12 format, offsets[1] is not 0 and 209 * handles[0] is same as handles[1]. 210 */ 211 if (mode_cmd->offsets[1] && 212 mode_cmd->handles[0] == mode_cmd->handles[1]) 213 cnt = 1; 214 } 215 216 return cnt; 217 } 218 219 static struct drm_framebuffer * 220 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv, 221 struct drm_mode_fb_cmd2 *mode_cmd) 222 { 223 struct drm_gem_object *obj; 224 struct exynos_drm_gem_obj *exynos_gem_obj; 225 struct exynos_drm_fb *exynos_fb; 226 int i, ret; 227 228 DRM_DEBUG_KMS("%s\n", __FILE__); 229 230 exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL); 231 if (!exynos_fb) { 232 DRM_ERROR("failed to allocate exynos drm framebuffer\n"); 233 return ERR_PTR(-ENOMEM); 234 } 235 236 obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]); 237 if (!obj) { 238 DRM_ERROR("failed to lookup gem object\n"); 239 ret = -ENOENT; 240 goto err_free; 241 } 242 243 drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd); 244 exynos_fb->exynos_gem_obj[0] = to_exynos_gem_obj(obj); 245 exynos_fb->buf_cnt = exynos_drm_format_num_buffers(mode_cmd); 246 247 DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt); 248 249 for (i = 1; i < exynos_fb->buf_cnt; i++) { 250 obj = drm_gem_object_lookup(dev, file_priv, 251 mode_cmd->handles[i]); 252 if (!obj) { 253 DRM_ERROR("failed to lookup gem object\n"); 254 ret = -ENOENT; 255 exynos_fb->buf_cnt = i; 256 goto err_unreference; 257 } 258 259 exynos_gem_obj = to_exynos_gem_obj(obj); 260 exynos_fb->exynos_gem_obj[i] = exynos_gem_obj; 261 262 ret = check_fb_gem_memory_type(dev, exynos_gem_obj); 263 if (ret < 0) { 264 DRM_ERROR("cannot use this gem memory type for fb.\n"); 265 goto err_unreference; 266 } 267 } 268 269 ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs); 270 if (ret) { 271 DRM_ERROR("failed to init framebuffer.\n"); 272 goto err_unreference; 273 } 274 275 return &exynos_fb->fb; 276 277 err_unreference: 278 for (i = 0; i < exynos_fb->buf_cnt; i++) { 279 struct drm_gem_object *obj; 280 281 obj = &exynos_fb->exynos_gem_obj[i]->base; 282 if (obj) 283 drm_gem_object_unreference_unlocked(obj); 284 } 285 err_free: 286 kfree(exynos_fb); 287 return ERR_PTR(ret); 288 } 289 290 struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb, 291 int index) 292 { 293 struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb); 294 struct exynos_drm_gem_buf *buffer; 295 296 DRM_DEBUG_KMS("%s\n", __FILE__); 297 298 if (index >= MAX_FB_BUFFER) 299 return NULL; 300 301 buffer = exynos_fb->exynos_gem_obj[index]->buffer; 302 if (!buffer) 303 return NULL; 304 305 DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)buffer->dma_addr); 306 307 return buffer; 308 } 309 310 static void exynos_drm_output_poll_changed(struct drm_device *dev) 311 { 312 struct exynos_drm_private *private = dev->dev_private; 313 struct drm_fb_helper *fb_helper = private->fb_helper; 314 315 if (fb_helper) 316 drm_fb_helper_hotplug_event(fb_helper); 317 } 318 319 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = { 320 .fb_create = exynos_user_fb_create, 321 .output_poll_changed = exynos_drm_output_poll_changed, 322 }; 323 324 void exynos_drm_mode_config_init(struct drm_device *dev) 325 { 326 dev->mode_config.min_width = 0; 327 dev->mode_config.min_height = 0; 328 329 /* 330 * set max width and height as default value(4096x4096). 331 * this value would be used to check framebuffer size limitation 332 * at drm_mode_addfb(). 333 */ 334 dev->mode_config.max_width = 4096; 335 dev->mode_config.max_height = 4096; 336 337 dev->mode_config.funcs = &exynos_drm_mode_config_funcs; 338 } 339