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