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_fbdev.h" 24 #include "exynos_drm_gem.h" 25 #include "exynos_drm_iommu.h" 26 #include "exynos_drm_crtc.h" 27 28 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb) 29 30 /* 31 * exynos specific framebuffer structure. 32 * 33 * @fb: drm framebuffer obejct. 34 * @buf_cnt: a buffer count to drm framebuffer. 35 * @exynos_gem_obj: array of exynos specific gem object containing a gem object. 36 */ 37 struct exynos_drm_fb { 38 struct drm_framebuffer fb; 39 unsigned int buf_cnt; 40 struct exynos_drm_gem_obj *exynos_gem_obj[MAX_FB_BUFFER]; 41 }; 42 43 static int check_fb_gem_memory_type(struct drm_device *drm_dev, 44 struct exynos_drm_gem_obj *exynos_gem_obj) 45 { 46 unsigned int flags; 47 48 /* 49 * if exynos drm driver supports iommu then framebuffer can use 50 * all the buffer types. 51 */ 52 if (is_drm_iommu_supported(drm_dev)) 53 return 0; 54 55 flags = exynos_gem_obj->flags; 56 57 /* 58 * without iommu support, not support physically non-continuous memory 59 * for framebuffer. 60 */ 61 if (IS_NONCONTIG_BUFFER(flags)) { 62 DRM_ERROR("cannot use this gem memory type for fb.\n"); 63 return -EINVAL; 64 } 65 66 return 0; 67 } 68 69 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb) 70 { 71 struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb); 72 unsigned int i; 73 74 /* make sure that overlay data are updated before relesing fb. */ 75 exynos_drm_crtc_complete_scanout(fb); 76 77 drm_framebuffer_cleanup(fb); 78 79 for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) { 80 struct drm_gem_object *obj; 81 82 if (exynos_fb->exynos_gem_obj[i] == NULL) 83 continue; 84 85 obj = &exynos_fb->exynos_gem_obj[i]->base; 86 drm_gem_object_unreference_unlocked(obj); 87 } 88 89 kfree(exynos_fb); 90 exynos_fb = NULL; 91 } 92 93 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb, 94 struct drm_file *file_priv, 95 unsigned int *handle) 96 { 97 struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb); 98 99 /* This fb should have only one gem object. */ 100 if (WARN_ON(exynos_fb->buf_cnt != 1)) 101 return -EINVAL; 102 103 return drm_gem_handle_create(file_priv, 104 &exynos_fb->exynos_gem_obj[0]->base, handle); 105 } 106 107 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb, 108 struct drm_file *file_priv, unsigned flags, 109 unsigned color, struct drm_clip_rect *clips, 110 unsigned num_clips) 111 { 112 /* TODO */ 113 114 return 0; 115 } 116 117 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = { 118 .destroy = exynos_drm_fb_destroy, 119 .create_handle = exynos_drm_fb_create_handle, 120 .dirty = exynos_drm_fb_dirty, 121 }; 122 123 void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb, 124 unsigned int cnt) 125 { 126 struct exynos_drm_fb *exynos_fb; 127 128 exynos_fb = to_exynos_fb(fb); 129 130 exynos_fb->buf_cnt = cnt; 131 } 132 133 unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb) 134 { 135 struct exynos_drm_fb *exynos_fb; 136 137 exynos_fb = to_exynos_fb(fb); 138 139 return exynos_fb->buf_cnt; 140 } 141 142 struct drm_framebuffer * 143 exynos_drm_framebuffer_init(struct drm_device *dev, 144 struct drm_mode_fb_cmd2 *mode_cmd, 145 struct drm_gem_object *obj) 146 { 147 struct exynos_drm_fb *exynos_fb; 148 struct exynos_drm_gem_obj *exynos_gem_obj; 149 int ret; 150 151 exynos_gem_obj = to_exynos_gem_obj(obj); 152 153 ret = check_fb_gem_memory_type(dev, exynos_gem_obj); 154 if (ret < 0) 155 return ERR_PTR(ret); 156 157 exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL); 158 if (!exynos_fb) 159 return ERR_PTR(-ENOMEM); 160 161 drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd); 162 exynos_fb->exynos_gem_obj[0] = exynos_gem_obj; 163 164 ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs); 165 if (ret) { 166 kfree(exynos_fb); 167 DRM_ERROR("failed to initialize framebuffer\n"); 168 return ERR_PTR(ret); 169 } 170 171 return &exynos_fb->fb; 172 } 173 174 static u32 exynos_drm_format_num_buffers(struct drm_mode_fb_cmd2 *mode_cmd) 175 { 176 unsigned int cnt = 0; 177 178 if (mode_cmd->pixel_format != DRM_FORMAT_NV12) 179 return drm_format_num_planes(mode_cmd->pixel_format); 180 181 while (cnt != MAX_FB_BUFFER) { 182 if (!mode_cmd->handles[cnt]) 183 break; 184 cnt++; 185 } 186 187 /* 188 * check if NV12 or NV12M. 189 * 190 * NV12 191 * handles[0] = base1, offsets[0] = 0 192 * handles[1] = base1, offsets[1] = Y_size 193 * 194 * NV12M 195 * handles[0] = base1, offsets[0] = 0 196 * handles[1] = base2, offsets[1] = 0 197 */ 198 if (cnt == 2) { 199 /* 200 * in case of NV12 format, offsets[1] is not 0 and 201 * handles[0] is same as handles[1]. 202 */ 203 if (mode_cmd->offsets[1] && 204 mode_cmd->handles[0] == mode_cmd->handles[1]) 205 cnt = 1; 206 } 207 208 return cnt; 209 } 210 211 static struct drm_framebuffer * 212 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv, 213 struct drm_mode_fb_cmd2 *mode_cmd) 214 { 215 struct drm_gem_object *obj; 216 struct exynos_drm_gem_obj *exynos_gem_obj; 217 struct exynos_drm_fb *exynos_fb; 218 int i, ret; 219 220 exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL); 221 if (!exynos_fb) 222 return ERR_PTR(-ENOMEM); 223 224 obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]); 225 if (!obj) { 226 DRM_ERROR("failed to lookup gem object\n"); 227 ret = -ENOENT; 228 goto err_free; 229 } 230 231 drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd); 232 exynos_fb->exynos_gem_obj[0] = to_exynos_gem_obj(obj); 233 exynos_fb->buf_cnt = exynos_drm_format_num_buffers(mode_cmd); 234 235 DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt); 236 237 for (i = 1; i < exynos_fb->buf_cnt; i++) { 238 obj = drm_gem_object_lookup(dev, file_priv, 239 mode_cmd->handles[i]); 240 if (!obj) { 241 DRM_ERROR("failed to lookup gem object\n"); 242 ret = -ENOENT; 243 exynos_fb->buf_cnt = i; 244 goto err_unreference; 245 } 246 247 exynos_gem_obj = to_exynos_gem_obj(obj); 248 exynos_fb->exynos_gem_obj[i] = exynos_gem_obj; 249 250 ret = check_fb_gem_memory_type(dev, exynos_gem_obj); 251 if (ret < 0) 252 goto err_unreference; 253 } 254 255 ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs); 256 if (ret) { 257 DRM_ERROR("failed to init framebuffer.\n"); 258 goto err_unreference; 259 } 260 261 return &exynos_fb->fb; 262 263 err_unreference: 264 for (i = 0; i < exynos_fb->buf_cnt; i++) { 265 struct drm_gem_object *obj; 266 267 obj = &exynos_fb->exynos_gem_obj[i]->base; 268 if (obj) 269 drm_gem_object_unreference_unlocked(obj); 270 } 271 err_free: 272 kfree(exynos_fb); 273 return ERR_PTR(ret); 274 } 275 276 struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb, 277 int index) 278 { 279 struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb); 280 struct exynos_drm_gem_buf *buffer; 281 282 if (index >= MAX_FB_BUFFER) 283 return NULL; 284 285 buffer = exynos_fb->exynos_gem_obj[index]->buffer; 286 if (!buffer) 287 return NULL; 288 289 DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)buffer->dma_addr); 290 291 return buffer; 292 } 293 294 static void exynos_drm_output_poll_changed(struct drm_device *dev) 295 { 296 struct exynos_drm_private *private = dev->dev_private; 297 struct drm_fb_helper *fb_helper = private->fb_helper; 298 299 if (fb_helper) 300 drm_fb_helper_hotplug_event(fb_helper); 301 else 302 exynos_drm_fbdev_init(dev); 303 } 304 305 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = { 306 .fb_create = exynos_user_fb_create, 307 .output_poll_changed = exynos_drm_output_poll_changed, 308 }; 309 310 void exynos_drm_mode_config_init(struct drm_device *dev) 311 { 312 dev->mode_config.min_width = 0; 313 dev->mode_config.min_height = 0; 314 315 /* 316 * set max width and height as default value(4096x4096). 317 * this value would be used to check framebuffer size limitation 318 * at drm_mode_addfb(). 319 */ 320 dev->mode_config.max_width = 4096; 321 dev->mode_config.max_height = 4096; 322 323 dev->mode_config.funcs = &exynos_drm_mode_config_funcs; 324 } 325