include/drm/drm_fb_helper.h

   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_client.h>
  36 #include <drm/drm_crtc.h>
  37 #include <drm/drm_device.h>
  38 #include <linux/kgdb.h>
  39 #include <linux/vgaarb.h>
  40
  41 enum mode_set_atomic {
  42         LEAVE_ATOMIC_MODE_SET,
  43         ENTER_ATOMIC_MODE_SET,
  44 };
  45
  46 /**
  47  * struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size
  48  * @fb_width: fbdev width
  49  * @fb_height: fbdev height
  50  * @surface_width: scanout buffer width
  51  * @surface_height: scanout buffer height
  52  * @surface_bpp: scanout buffer bpp
  53  * @surface_depth: scanout buffer depth
  54  *
  55  * Note that the scanout surface width/height may be larger than the fbdev
  56  * width/height.  In case of multiple displays, the scanout surface is sized
  57  * according to the largest width/height (so it is large enough for all CRTCs
  58  * to scanout).  But the fbdev width/height is sized to the minimum width/
  59  * height of all the displays.  This ensures that fbcon fits on the smallest
  60  * of the attached displays. fb_width/fb_height is used by
  61  * drm_fb_helper_fill_info() to fill out the &fb_info.var structure.
  62  */
  63 struct drm_fb_helper_surface_size {
  64         u32 fb_width;
  65         u32 fb_height;
  66         u32 surface_width;
  67         u32 surface_height;
  68         u32 surface_bpp;
  69         u32 surface_depth;
  70 };
  71
  72 /**
  73  * struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library
  74  *
  75  * Driver callbacks used by the fbdev emulation helper library.
  76  */
  77 struct drm_fb_helper_funcs {
  78         /**
  79          * @fb_probe:
  80          *
  81          * Driver callback to allocate and initialize the fbdev info structure.
  82          * Furthermore it also needs to allocate the DRM framebuffer used to
  83          * back the fbdev.
  84          *
  85          * This callback is mandatory.
  86          *
  87          * RETURNS:
  88          *
  89          * The driver should return 0 on success and a negative error code on
  90          * failure.
  91          */
  92         int (*fb_probe)(struct drm_fb_helper *helper,
  93                         struct drm_fb_helper_surface_size *sizes);
  94 };
  95
  96 /**
  97  * struct drm_fb_helper - main structure to emulate fbdev on top of KMS
  98  * @fb: Scanout framebuffer object
  99  * @dev: DRM device
 100  * @funcs: driver callbacks for fb helper
 101  * @fbdev: emulated fbdev device info struct
 102  * @pseudo_palette: fake palette of 16 colors
 103  * @damage_clip: clip rectangle used with deferred_io to accumulate damage to
 104  *                the screen buffer
 105  * @damage_lock: spinlock protecting @damage_clip
 106  * @damage_work: worker used to flush the framebuffer
 107  * @resume_work: worker used during resume if the console lock is already taken
 108  *
 109  * This is the main structure used by the fbdev helpers. Drivers supporting
 110  * fbdev emulation should embedded this into their overall driver structure.
 111  * Drivers must also fill out a &struct drm_fb_helper_funcs with a few
 112  * operations.
 113  */
 114 struct drm_fb_helper {
 115         /**
 116          * @client:
 117          *
 118          * DRM client used by the generic fbdev emulation.
 119          */
 120         struct drm_client_dev client;
 121
 122         /**
 123          * @buffer:
 124          *
 125          * Framebuffer used by the generic fbdev emulation.
 126          */
 127         struct drm_client_buffer *buffer;
 128
 129         struct drm_framebuffer *fb;
 130         struct drm_device *dev;
 131         const struct drm_fb_helper_funcs *funcs;
 132         struct fb_info *fbdev;
 133         u32 pseudo_palette[17];
 134         struct drm_clip_rect damage_clip;
 135         spinlock_t damage_lock;
 136         struct work_struct damage_work;
 137         struct work_struct resume_work;
 138
 139         /**
 140          * @lock:
 141          *
 142          * Top-level FBDEV helper lock. This protects all internal data
 143          * structures and lists, such as @connector_info and @crtc_info.
 144          *
 145          * FIXME: fbdev emulation locking is a mess and long term we want to
 146          * protect all helper internal state with this lock as well as reduce
 147          * core KMS locking as much as possible.
 148          */
 149         struct mutex lock;
 150
 151         /**
 152          * @kernel_fb_list:
 153          *
 154          * Entry on the global kernel_fb_helper_list, used for kgdb entry/exit.
 155          */
 156         struct list_head kernel_fb_list;
 157
 158         /**
 159          * @delayed_hotplug:
 160          *
 161          * A hotplug was received while fbdev wasn't in control of the DRM
 162          * device, i.e. another KMS master was active. The output configuration
 163          * needs to be reprobe when fbdev is in control again.
 164          */
 165         bool delayed_hotplug;
 166
 167         /**
 168          * @deferred_setup:
 169          *
 170          * If no outputs are connected (disconnected or unknown) the FB helper
 171          * code will defer setup until at least one of the outputs shows up.
 172          * This field keeps track of the status so that setup can be retried
 173          * at every hotplug event until it succeeds eventually.
 174          *
 175          * Protected by @lock.
 176          */
 177         bool deferred_setup;
 178
 179         /**
 180          * @preferred_bpp:
 181          *
 182          * Temporary storage for the driver's preferred BPP setting passed to
 183          * FB helper initialization. This needs to be tracked so that deferred
 184          * FB helper setup can pass this on.
 185          *
 186          * See also: @deferred_setup
 187          */
 188         int preferred_bpp;
 189 };
 190
 191 static inline struct drm_fb_helper *
 192 drm_fb_helper_from_client(struct drm_client_dev *client)
 193 {
 194         return container_of(client, struct drm_fb_helper, client);
 195 }
 196
 197 /**
 198  * define DRM_FB_HELPER_DEFAULT_OPS - helper define for drm drivers
 199  *
 200  * Helper define to register default implementations of drm_fb_helper
 201  * functions. To be used in struct fb_ops of drm drivers.
 202  */
 203 #define DRM_FB_HELPER_DEFAULT_OPS \
 204         .fb_check_var   = drm_fb_helper_check_var, \
 205         .fb_set_par     = drm_fb_helper_set_par, \
 206         .fb_setcmap     = drm_fb_helper_setcmap, \
 207         .fb_blank       = drm_fb_helper_blank, \
 208         .fb_pan_display = drm_fb_helper_pan_display, \
 209         .fb_debug_enter = drm_fb_helper_debug_enter, \
 210         .fb_debug_leave = drm_fb_helper_debug_leave, \
 211         .fb_ioctl       = drm_fb_helper_ioctl
 212
 213 #ifdef CONFIG_DRM_FBDEV_EMULATION
 214 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 215                            const struct drm_fb_helper_funcs *funcs);
 216 int drm_fb_helper_init(struct drm_device *dev, struct drm_fb_helper *helper);
 217 void drm_fb_helper_fini(struct drm_fb_helper *helper);
 218 int drm_fb_helper_blank(int blank, struct fb_info *info);
 219 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 220                               struct fb_info *info);
 221 int drm_fb_helper_set_par(struct fb_info *info);
 222 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 223                             struct fb_info *info);
 224
 225 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper);
 226
 227 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper);
 228 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper);
 229 void drm_fb_helper_fill_info(struct fb_info *info,
 230                              struct drm_fb_helper *fb_helper,
 231                              struct drm_fb_helper_surface_size *sizes);
 232
 233 void drm_fb_helper_deferred_io(struct fb_info *info,
 234                                struct list_head *pagelist);
 235
 236 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 237                                size_t count, loff_t *ppos);
 238 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 239                                 size_t count, loff_t *ppos);
 240
 241 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 242                                 const struct fb_fillrect *rect);
 243 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 244                                 const struct fb_copyarea *area);
 245 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 246                                  const struct fb_image *image);
 247
 248 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 249                                 const struct fb_fillrect *rect);
 250 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 251                                 const struct fb_copyarea *area);
 252 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 253                                  const struct fb_image *image);
 254
 255 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend);
 256 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
 257                                         bool suspend);
 258
 259 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
 260
 261 int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
 262                         unsigned long arg);
 263
 264 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
 265 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
 266 int drm_fb_helper_debug_enter(struct fb_info *info);
 267 int drm_fb_helper_debug_leave(struct fb_info *info);
 268
 269 void drm_fb_helper_lastclose(struct drm_device *dev);
 270 void drm_fb_helper_output_poll_changed(struct drm_device *dev);
 271
 272 void drm_fbdev_generic_setup(struct drm_device *dev,
 273                              unsigned int preferred_bpp);
 274 #else
 275 static inline void drm_fb_helper_prepare(struct drm_device *dev,
 276                                         struct drm_fb_helper *helper,
 277                                         const struct drm_fb_helper_funcs *funcs)
 278 {
 279 }
 280
 281 static inline int drm_fb_helper_init(struct drm_device *dev,
 282                        struct drm_fb_helper *helper)
 283 {
 284         /* So drivers can use it to free the struct */
 285         helper->dev = dev;
 286         dev->fb_helper = helper;
 287
 288         return 0;
 289 }
 290
 291 static inline void drm_fb_helper_fini(struct drm_fb_helper *helper)
 292 {
 293         if (helper && helper->dev)
 294                 helper->dev->fb_helper = NULL;
 295 }
 296
 297 static inline int drm_fb_helper_blank(int blank, struct fb_info *info)
 298 {
 299         return 0;
 300 }
 301
 302 static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 303                                             struct fb_info *info)
 304 {
 305         return 0;
 306 }
 307
 308 static inline int drm_fb_helper_set_par(struct fb_info *info)
 309 {
 310         return 0;
 311 }
 312
 313 static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 314                                           struct fb_info *info)
 315 {
 316         return 0;
 317 }
 318
 319 static inline int
 320 drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 321 {
 322         return 0;
 323 }
 324
 325 static inline struct fb_info *
 326 drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 327 {
 328         return NULL;
 329 }
 330
 331 static inline void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 332 {
 333 }
 334
 335 static inline void
 336 drm_fb_helper_fill_info(struct fb_info *info,
 337                         struct drm_fb_helper *fb_helper,
 338                         struct drm_fb_helper_surface_size *sizes)
 339 {
 340 }
 341
 342 static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap,
 343                                         struct fb_info *info)
 344 {
 345         return 0;
 346 }
 347
 348 static inline int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
 349                                       unsigned long arg)
 350 {
 351         return 0;
 352 }
 353
 354 static inline void drm_fb_helper_deferred_io(struct fb_info *info,
 355                                              struct list_head *pagelist)
 356 {
 357 }
 358
 359 static inline int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper)
 360 {
 361         return -ENODEV;
 362 }
 363
 364 static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info,
 365                                              char __user *buf, size_t count,
 366                                              loff_t *ppos)
 367 {
 368         return -ENODEV;
 369 }
 370
 371 static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info,
 372                                               const char __user *buf,
 373                                               size_t count, loff_t *ppos)
 374 {
 375         return -ENODEV;
 376 }
 377
 378 static inline void drm_fb_helper_sys_fillrect(struct fb_info *info,
 379                                               const struct fb_fillrect *rect)
 380 {
 381 }
 382
 383 static inline void drm_fb_helper_sys_copyarea(struct fb_info *info,
 384                                               const struct fb_copyarea *area)
 385 {
 386 }
 387
 388 static inline void drm_fb_helper_sys_imageblit(struct fb_info *info,
 389                                                const struct fb_image *image)
 390 {
 391 }
 392
 393 static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 394                                               const struct fb_fillrect *rect)
 395 {
 396 }
 397
 398 static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 399                                               const struct fb_copyarea *area)
 400 {
 401 }
 402
 403 static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 404                                                const struct fb_image *image)
 405 {
 406 }
 407
 408 static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper,
 409                                              bool suspend)
 410 {
 411 }
 412
 413 static inline void
 414 drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, bool suspend)
 415 {
 416 }
 417
 418 static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
 419 {
 420         return 0;
 421 }
 422
 423 static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper,
 424                                                int bpp_sel)
 425 {
 426         return 0;
 427 }
 428
 429 static inline int drm_fb_helper_debug_enter(struct fb_info *info)
 430 {
 431         return 0;
 432 }
 433
 434 static inline int drm_fb_helper_debug_leave(struct fb_info *info)
 435 {
 436         return 0;
 437 }
 438
 439 static inline void drm_fb_helper_lastclose(struct drm_device *dev)
 440 {
 441 }
 442
 443 static inline void drm_fb_helper_output_poll_changed(struct drm_device *dev)
 444 {
 445 }
 446
 447 static inline void
 448 drm_fbdev_generic_setup(struct drm_device *dev, unsigned int preferred_bpp)
 449 {
 450 }
 451
 452 #endif
 453
 454 /**
 455  * drm_fb_helper_remove_conflicting_framebuffers - remove firmware-configured framebuffers
 456  * @a: memory range, users of which are to be removed
 457  * @name: requesting driver name
 458  * @primary: also kick vga16fb if present
 459  *
 460  * This function removes framebuffer devices (initialized by firmware/bootloader)
 461  * which use memory range described by @a. If @a is NULL all such devices are
 462  * removed.
 463  */
 464 static inline int
 465 drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
 466                                               const char *name, bool primary)
 467 {
 468 #if IS_REACHABLE(CONFIG_FB)
 469         return remove_conflicting_framebuffers(a, name, primary);
 470 #else
 471         return 0;
 472 #endif
 473 }
 474
 475 /**
 476  * drm_fb_helper_remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
 477  * @pdev: PCI device
 478  * @name: requesting driver name
 479  *
 480  * This function removes framebuffer devices (eg. initialized by firmware)
 481  * using memory range configured for any of @pdev's memory bars.
 482  *
 483  * The function assumes that PCI device with shadowed ROM drives a primary
 484  * display and so kicks out vga16fb.
 485  */
 486 static inline int
 487 drm_fb_helper_remove_conflicting_pci_framebuffers(struct pci_dev *pdev,
 488                                                   const char *name)
 489 {
 490         int ret = 0;
 491
 492         /*
 493          * WARNING: Apparently we must kick fbdev drivers before vgacon,
 494          * otherwise the vga fbdev driver falls over.
 495          */
 496 #if IS_REACHABLE(CONFIG_FB)
 497         ret = remove_conflicting_pci_framebuffers(pdev, name);
 498 #endif
 499         if (ret == 0)
 500                 ret = vga_remove_vgacon(pdev);
 501         return ret;
 502 }
 503
 504 #endif