1 /* 2 * Copyright (c) 2006-2009 Red Hat Inc. 3 * Copyright (c) 2006-2008 Intel Corporation 4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> 5 * 6 * DRM framebuffer helper functions 7 * 8 * Permission to use, copy, modify, distribute, and sell this software and its 9 * documentation for any purpose is hereby granted without fee, provided that 10 * the above copyright notice appear in all copies and that both that copyright 11 * notice and this permission notice appear in supporting documentation, and 12 * that the name of the copyright holders not be used in advertising or 13 * publicity pertaining to distribution of the software without specific, 14 * written prior permission. The copyright holders make no representations 15 * about the suitability of this software for any purpose. It is provided "as 16 * is" without express or implied warranty. 17 * 18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 24 * OF THIS SOFTWARE. 25 * 26 * Authors: 27 * Dave Airlie <airlied@linux.ie> 28 * Jesse Barnes <jesse.barnes@intel.com> 29 */ 30 #ifndef DRM_FB_HELPER_H 31 #define DRM_FB_HELPER_H 32 33 struct drm_fb_helper; 34 35 #include <drm/drm_crtc.h> 36 #include <linux/kgdb.h> 37 38 enum mode_set_atomic { 39 LEAVE_ATOMIC_MODE_SET, 40 ENTER_ATOMIC_MODE_SET, 41 }; 42 43 struct drm_fb_offset { 44 int x, y; 45 }; 46 47 struct drm_fb_helper_crtc { 48 struct drm_mode_set mode_set; 49 struct drm_display_mode *desired_mode; 50 int x, y; 51 }; 52 53 /** 54 * struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size 55 * @fb_width: fbdev width 56 * @fb_height: fbdev height 57 * @surface_width: scanout buffer width 58 * @surface_height: scanout buffer height 59 * @surface_bpp: scanout buffer bpp 60 * @surface_depth: scanout buffer depth 61 * 62 * Note that the scanout surface width/height may be larger than the fbdev 63 * width/height. In case of multiple displays, the scanout surface is sized 64 * according to the largest width/height (so it is large enough for all CRTCs 65 * to scanout). But the fbdev width/height is sized to the minimum width/ 66 * height of all the displays. This ensures that fbcon fits on the smallest 67 * of the attached displays. 68 * 69 * So what is passed to drm_fb_helper_fill_var() should be fb_width/fb_height, 70 * rather than the surface size. 71 */ 72 struct drm_fb_helper_surface_size { 73 u32 fb_width; 74 u32 fb_height; 75 u32 surface_width; 76 u32 surface_height; 77 u32 surface_bpp; 78 u32 surface_depth; 79 }; 80 81 /** 82 * struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library 83 * 84 * Driver callbacks used by the fbdev emulation helper library. 85 */ 86 struct drm_fb_helper_funcs { 87 /** 88 * @fb_probe: 89 * 90 * Driver callback to allocate and initialize the fbdev info structure. 91 * Furthermore it also needs to allocate the DRM framebuffer used to 92 * back the fbdev. 93 * 94 * This callback is mandatory. 95 * 96 * RETURNS: 97 * 98 * The driver should return 0 on success and a negative error code on 99 * failure. 100 */ 101 int (*fb_probe)(struct drm_fb_helper *helper, 102 struct drm_fb_helper_surface_size *sizes); 103 104 /** 105 * @initial_config: 106 * 107 * Driver callback to setup an initial fbdev display configuration. 108 * Drivers can use this callback to tell the fbdev emulation what the 109 * preferred initial configuration is. This is useful to implement 110 * smooth booting where the fbdev (and subsequently all userspace) never 111 * changes the mode, but always inherits the existing configuration. 112 * 113 * This callback is optional. 114 * 115 * RETURNS: 116 * 117 * The driver should return true if a suitable initial configuration has 118 * been filled out and false when the fbdev helper should fall back to 119 * the default probing logic. 120 */ 121 bool (*initial_config)(struct drm_fb_helper *fb_helper, 122 struct drm_fb_helper_crtc **crtcs, 123 struct drm_display_mode **modes, 124 struct drm_fb_offset *offsets, 125 bool *enabled, int width, int height); 126 }; 127 128 struct drm_fb_helper_connector { 129 struct drm_connector *connector; 130 }; 131 132 /** 133 * struct drm_fb_helper - main structure to emulate fbdev on top of KMS 134 * @fb: Scanout framebuffer object 135 * @dev: DRM device 136 * @crtc_count: number of possible CRTCs 137 * @crtc_info: per-CRTC helper state (mode, x/y offset, etc) 138 * @connector_count: number of connected connectors 139 * @connector_info_alloc_count: size of connector_info 140 * @funcs: driver callbacks for fb helper 141 * @fbdev: emulated fbdev device info struct 142 * @pseudo_palette: fake palette of 16 colors 143 * @dirty_clip: clip rectangle used with deferred_io to accumulate damage to 144 * the screen buffer 145 * @dirty_lock: spinlock protecting @dirty_clip 146 * @dirty_work: worker used to flush the framebuffer 147 * @resume_work: worker used during resume if the console lock is already taken 148 * 149 * This is the main structure used by the fbdev helpers. Drivers supporting 150 * fbdev emulation should embedded this into their overall driver structure. 151 * Drivers must also fill out a &struct drm_fb_helper_funcs with a few 152 * operations. 153 */ 154 struct drm_fb_helper { 155 struct drm_framebuffer *fb; 156 struct drm_device *dev; 157 int crtc_count; 158 struct drm_fb_helper_crtc *crtc_info; 159 int connector_count; 160 int connector_info_alloc_count; 161 /** 162 * @connector_info: 163 * 164 * Array of per-connector information. Do not iterate directly, but use 165 * drm_fb_helper_for_each_connector. 166 */ 167 struct drm_fb_helper_connector **connector_info; 168 const struct drm_fb_helper_funcs *funcs; 169 struct fb_info *fbdev; 170 u32 pseudo_palette[17]; 171 struct drm_clip_rect dirty_clip; 172 spinlock_t dirty_lock; 173 struct work_struct dirty_work; 174 struct work_struct resume_work; 175 176 /** 177 * @lock: 178 * 179 * Top-level FBDEV helper lock. This protects all internal data 180 * structures and lists, such as @connector_info and @crtc_info. 181 * 182 * FIXME: fbdev emulation locking is a mess and long term we want to 183 * protect all helper internal state with this lock as well as reduce 184 * core KMS locking as much as possible. 185 */ 186 struct lock lock; 187 188 /** 189 * @kernel_fb_list: 190 * 191 * Entry on the global kernel_fb_helper_list, used for kgdb entry/exit. 192 */ 193 struct list_head kernel_fb_list; 194 195 /** 196 * @delayed_hotplug: 197 * 198 * A hotplug was received while fbdev wasn't in control of the DRM 199 * device, i.e. another KMS master was active. The output configuration 200 * needs to be reprobe when fbdev is in control again. 201 */ 202 bool delayed_hotplug; 203 204 /** 205 * @deferred_setup: 206 * 207 * If no outputs are connected (disconnected or unknown) the FB helper 208 * code will defer setup until at least one of the outputs shows up. 209 * This field keeps track of the status so that setup can be retried 210 * at every hotplug event until it succeeds eventually. 211 * 212 * Protected by @lock. 213 */ 214 bool deferred_setup; 215 216 /** 217 * @preferred_bpp: 218 * 219 * Temporary storage for the driver's preferred BPP setting passed to 220 * FB helper initialization. This needs to be tracked so that deferred 221 * FB helper setup can pass this on. 222 * 223 * See also: @deferred_setup 224 */ 225 int preferred_bpp; 226 }; 227 228 /** 229 * define DRM_FB_HELPER_DEFAULT_OPS - helper define for drm drivers 230 * 231 * Helper define to register default implementations of drm_fb_helper 232 * functions. To be used in struct fb_ops of drm drivers. 233 */ 234 #define DRM_FB_HELPER_DEFAULT_OPS \ 235 .fb_check_var = drm_fb_helper_check_var, \ 236 .fb_set_par = drm_fb_helper_set_par, \ 237 .fb_setcmap = drm_fb_helper_setcmap, \ 238 .fb_blank = drm_fb_helper_blank, \ 239 .fb_pan_display = drm_fb_helper_pan_display, \ 240 .fb_debug_enter = drm_fb_helper_debug_enter, \ 241 .fb_debug_leave = drm_fb_helper_debug_leave, \ 242 .fb_ioctl = drm_fb_helper_ioctl 243 244 #ifdef CONFIG_DRM_FBDEV_EMULATION 245 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, 246 const struct drm_fb_helper_funcs *funcs); 247 int drm_fb_helper_init(struct drm_device *dev, 248 struct drm_fb_helper *helper, int max_conn); 249 void drm_fb_helper_fini(struct drm_fb_helper *helper); 250 int drm_fb_helper_blank(int blank, struct fb_info *info); 251 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 252 struct fb_info *info); 253 int drm_fb_helper_set_par(struct fb_info *info); 254 int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 255 struct fb_info *info); 256 257 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper); 258 259 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper); 260 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper); 261 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, 262 uint32_t fb_width, uint32_t fb_height); 263 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 264 uint32_t depth); 265 266 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper); 267 268 void drm_fb_helper_deferred_io(struct fb_info *info, 269 struct list_head *pagelist); 270 271 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, 272 size_t count, loff_t *ppos); 273 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, 274 size_t count, loff_t *ppos); 275 276 void drm_fb_helper_sys_fillrect(struct fb_info *info, 277 const struct fb_fillrect *rect); 278 void drm_fb_helper_sys_copyarea(struct fb_info *info, 279 const struct fb_copyarea *area); 280 void drm_fb_helper_sys_imageblit(struct fb_info *info, 281 const struct fb_image *image); 282 283 void drm_fb_helper_cfb_fillrect(struct fb_info *info, 284 const struct fb_fillrect *rect); 285 void drm_fb_helper_cfb_copyarea(struct fb_info *info, 286 const struct fb_copyarea *area); 287 void drm_fb_helper_cfb_imageblit(struct fb_info *info, 288 const struct fb_image *image); 289 290 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend); 291 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, 292 bool suspend); 293 294 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info); 295 296 int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd, 297 unsigned long arg); 298 299 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper); 300 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel); 301 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper); 302 int drm_fb_helper_debug_enter(struct fb_info *info); 303 int drm_fb_helper_debug_leave(struct fb_info *info); 304 struct drm_display_mode * 305 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, 306 int width, int height); 307 struct drm_display_mode * 308 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn); 309 310 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector); 311 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, 312 struct drm_connector *connector); 313 void drm_fb_helper_output_poll_changed(struct drm_device *dev); 314 #else 315 static inline void drm_fb_helper_prepare(struct drm_device *dev, 316 struct drm_fb_helper *helper, 317 const struct drm_fb_helper_funcs *funcs) 318 { 319 } 320 321 static inline int drm_fb_helper_init(struct drm_device *dev, 322 struct drm_fb_helper *helper, 323 int max_conn) 324 { 325 return 0; 326 } 327 328 static inline void drm_fb_helper_fini(struct drm_fb_helper *helper) 329 { 330 } 331 332 static inline int drm_fb_helper_blank(int blank, struct fb_info *info) 333 { 334 return 0; 335 } 336 337 static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 338 struct fb_info *info) 339 { 340 return 0; 341 } 342 343 static inline int drm_fb_helper_set_par(struct fb_info *info) 344 { 345 return 0; 346 } 347 348 static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 349 struct fb_info *info) 350 { 351 return 0; 352 } 353 354 static inline int 355 drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) 356 { 357 return 0; 358 } 359 360 static inline struct fb_info * 361 drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper) 362 { 363 return NULL; 364 } 365 366 static inline void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper) 367 { 368 } 369 370 static inline void drm_fb_helper_fill_var(struct fb_info *info, 371 struct drm_fb_helper *fb_helper, 372 uint32_t fb_width, uint32_t fb_height) 373 { 374 } 375 376 static inline void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 377 uint32_t depth) 378 { 379 } 380 381 static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap, 382 struct fb_info *info) 383 { 384 return 0; 385 } 386 387 static inline int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd, 388 unsigned long arg) 389 { 390 return 0; 391 } 392 393 static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) 394 { 395 } 396 397 static inline void drm_fb_helper_deferred_io(struct fb_info *info, 398 struct list_head *pagelist) 399 { 400 } 401 402 static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info, 403 char __user *buf, size_t count, 404 loff_t *ppos) 405 { 406 return -ENODEV; 407 } 408 409 static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info, 410 const char __user *buf, 411 size_t count, loff_t *ppos) 412 { 413 return -ENODEV; 414 } 415 416 static inline void drm_fb_helper_sys_fillrect(struct fb_info *info, 417 const struct fb_fillrect *rect) 418 { 419 } 420 421 static inline void drm_fb_helper_sys_copyarea(struct fb_info *info, 422 const struct fb_copyarea *area) 423 { 424 } 425 426 static inline void drm_fb_helper_sys_imageblit(struct fb_info *info, 427 const struct fb_image *image) 428 { 429 } 430 431 static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info, 432 const struct fb_fillrect *rect) 433 { 434 } 435 436 static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info, 437 const struct fb_copyarea *area) 438 { 439 } 440 441 static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info, 442 const struct fb_image *image) 443 { 444 } 445 446 static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, 447 bool suspend) 448 { 449 } 450 451 static inline void 452 drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, bool suspend) 453 { 454 } 455 456 static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) 457 { 458 return 0; 459 } 460 461 static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, 462 int bpp_sel) 463 { 464 return 0; 465 } 466 467 static inline int 468 drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) 469 { 470 return 0; 471 } 472 473 static inline int drm_fb_helper_debug_enter(struct fb_info *info) 474 { 475 return 0; 476 } 477 478 static inline int drm_fb_helper_debug_leave(struct fb_info *info) 479 { 480 return 0; 481 } 482 483 static inline struct drm_display_mode * 484 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, 485 int width, int height) 486 { 487 return NULL; 488 } 489 490 static inline struct drm_display_mode * 491 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, 492 int width, int height) 493 { 494 return NULL; 495 } 496 497 static inline int 498 drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, 499 struct drm_connector *connector) 500 { 501 return 0; 502 } 503 504 static inline int 505 drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, 506 struct drm_connector *connector) 507 { 508 return 0; 509 } 510 511 512 static inline void drm_fb_helper_output_poll_changed(struct drm_device *dev) 513 { 514 } 515 516 #endif 517 518 static inline int 519 drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a, 520 const char *name, bool primary) 521 { 522 #if IS_ENABLED(CONFIG_FB) 523 return remove_conflicting_framebuffers(a, name, primary); 524 #else 525 return 0; 526 #endif 527 } 528 529 #endif 530