drivers/gpu/drm/drm_fb_helper.c

   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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31
  32 #include <linux/console.h>
  33 #include <linux/kernel.h>
  34 #include <linux/sysrq.h>
  35 #include <linux/slab.h>
  36 #include <linux/module.h>
  37 #include <drm/drmP.h>
  38 #include <drm/drm_crtc.h>
  39 #include <drm/drm_fb_helper.h>
  40 #include <drm/drm_crtc_helper.h>
  41 #include <drm/drm_atomic.h>
  42 #include <drm/drm_atomic_helper.h>
  43
  44 static bool drm_fbdev_emulation = true;
  45 module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600);
  46 MODULE_PARM_DESC(fbdev_emulation,
  47                  "Enable legacy fbdev emulation [default=true]");
  48
  49 static LIST_HEAD(kernel_fb_helper_list);
  50
  51 /**
  52  * DOC: fbdev helpers
  53  *
  54  * The fb helper functions are useful to provide an fbdev on top of a drm kernel
  55  * mode setting driver. They can be used mostly independently from the crtc
  56  * helper functions used by many drivers to implement the kernel mode setting
  57  * interfaces.
  58  *
  59  * Initialization is done as a four-step process with drm_fb_helper_prepare(),
  60  * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and
  61  * drm_fb_helper_initial_config(). Drivers with fancier requirements than the
  62  * default behaviour can override the third step with their own code.
  63  * Teardown is done with drm_fb_helper_fini().
  64  *
  65  * At runtime drivers should restore the fbdev console by calling
  66  * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
  67  * They should also notify the fb helper code from updates to the output
  68  * configuration by calling drm_fb_helper_hotplug_event(). For easier
  69  * integration with the output polling code in drm_crtc_helper.c the modeset
  70  * code provides a ->output_poll_changed callback.
  71  *
  72  * All other functions exported by the fb helper library can be used to
  73  * implement the fbdev driver interface by the driver.
  74  *
  75  * It is possible, though perhaps somewhat tricky, to implement race-free
  76  * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
  77  * helper must be called first to initialize the minimum required to make
  78  * hotplug detection work. Drivers also need to make sure to properly set up
  79  * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
  80  * it is safe to enable interrupts and start processing hotplug events. At the
  81  * same time, drivers should initialize all modeset objects such as CRTCs,
  82  * encoders and connectors. To finish up the fbdev helper initialization, the
  83  * drm_fb_helper_init() function is called. To probe for all attached displays
  84  * and set up an initial configuration using the detected hardware, drivers
  85  * should call drm_fb_helper_single_add_all_connectors() followed by
  86  * drm_fb_helper_initial_config().
  87  *
  88  * If &drm_framebuffer_funcs ->dirty is set, the
  89  * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
  90  * accumulate changes and schedule &drm_fb_helper ->dirty_work to run right
  91  * away. This worker then calls the dirty() function ensuring that it will
  92  * always run in process context since the fb_*() function could be running in
  93  * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
  94  * callback it will also schedule dirty_work with the damage collected from the
  95  * mmap page writes.
  96  */
  97
  98 /**
  99  * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev
 100  *                                             emulation helper
 101  * @fb_helper: fbdev initialized with drm_fb_helper_init
 102  *
 103  * This functions adds all the available connectors for use with the given
 104  * fb_helper. This is a separate step to allow drivers to freely assign
 105  * connectors to the fbdev, e.g. if some are reserved for special purposes or
 106  * not adequate to be used for the fbcon.
 107  *
 108  * This function is protected against concurrent connector hotadds/removals
 109  * using drm_fb_helper_add_one_connector() and
 110  * drm_fb_helper_remove_one_connector().
 111  */
 112 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 113 {
 114         struct drm_device *dev = fb_helper->dev;
 115         struct drm_connector *connector;
 116         int i, ret;
 117
 118         if (!drm_fbdev_emulation)
 119                 return 0;
 120
 121         mutex_lock(&dev->mode_config.mutex);
 122         drm_for_each_connector(connector, dev) {
 123                 ret = drm_fb_helper_add_one_connector(fb_helper, connector);
 124
 125                 if (ret)
 126                         goto fail;
 127         }
 128         mutex_unlock(&dev->mode_config.mutex);
 129         return 0;
 130 fail:
 131         for (i = 0; i < fb_helper->connector_count; i++) {
 132                 kfree(fb_helper->connector_info[i]);
 133                 fb_helper->connector_info[i] = NULL;
 134         }
 135         fb_helper->connector_count = 0;
 136         mutex_unlock(&dev->mode_config.mutex);
 137
 138         return ret;
 139 }
 140 EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
 141
 142 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector)
 143 {
 144         struct drm_fb_helper_connector **temp;
 145         struct drm_fb_helper_connector *fb_helper_connector;
 146
 147         if (!drm_fbdev_emulation)
 148                 return 0;
 149
 150         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 151         if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) {
 152                 temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL);
 153                 if (!temp)
 154                         return -ENOMEM;
 155
 156                 fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1;
 157                 fb_helper->connector_info = temp;
 158         }
 159
 160
 161         fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
 162         if (!fb_helper_connector)
 163                 return -ENOMEM;
 164
 165         drm_connector_reference(connector);
 166         fb_helper_connector->connector = connector;
 167         fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
 168         return 0;
 169 }
 170 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 171
 172 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 173                                        struct drm_connector *connector)
 174 {
 175         struct drm_fb_helper_connector *fb_helper_connector;
 176         int i, j;
 177
 178         if (!drm_fbdev_emulation)
 179                 return 0;
 180
 181         WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex));
 182
 183         for (i = 0; i < fb_helper->connector_count; i++) {
 184                 if (fb_helper->connector_info[i]->connector == connector)
 185                         break;
 186         }
 187
 188         if (i == fb_helper->connector_count)
 189                 return -EINVAL;
 190         fb_helper_connector = fb_helper->connector_info[i];
 191         drm_connector_unreference(fb_helper_connector->connector);
 192
 193         for (j = i + 1; j < fb_helper->connector_count; j++) {
 194                 fb_helper->connector_info[j - 1] = fb_helper->connector_info[j];
 195         }
 196         fb_helper->connector_count--;
 197         kfree(fb_helper_connector);
 198
 199         return 0;
 200 }
 201 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
 202
 203 static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
 204 {
 205         uint16_t *r_base, *g_base, *b_base;
 206         int i;
 207
 208         if (helper->funcs->gamma_get == NULL)
 209                 return;
 210
 211         r_base = crtc->gamma_store;
 212         g_base = r_base + crtc->gamma_size;
 213         b_base = g_base + crtc->gamma_size;
 214
 215         for (i = 0; i < crtc->gamma_size; i++)
 216                 helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
 217 }
 218
 219 static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 220 {
 221         uint16_t *r_base, *g_base, *b_base;
 222
 223         if (crtc->funcs->gamma_set == NULL)
 224                 return;
 225
 226         r_base = crtc->gamma_store;
 227         g_base = r_base + crtc->gamma_size;
 228         b_base = g_base + crtc->gamma_size;
 229
 230         crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, crtc->gamma_size);
 231 }
 232
 233 /**
 234  * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
 235  * @info: fbdev registered by the helper
 236  */
 237 int drm_fb_helper_debug_enter(struct fb_info *info)
 238 {
 239         struct drm_fb_helper *helper = info->par;
 240         const struct drm_crtc_helper_funcs *funcs;
 241         int i;
 242
 243         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 244                 for (i = 0; i < helper->crtc_count; i++) {
 245                         struct drm_mode_set *mode_set =
 246                                 &helper->crtc_info[i].mode_set;
 247
 248                         if (!mode_set->crtc->enabled)
 249                                 continue;
 250
 251                         funcs = mode_set->crtc->helper_private;
 252                         drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
 253                         funcs->mode_set_base_atomic(mode_set->crtc,
 254                                                     mode_set->fb,
 255                                                     mode_set->x,
 256                                                     mode_set->y,
 257                                                     ENTER_ATOMIC_MODE_SET);
 258                 }
 259         }
 260
 261         return 0;
 262 }
 263 EXPORT_SYMBOL(drm_fb_helper_debug_enter);
 264
 265 /* Find the real fb for a given fb helper CRTC */
 266 static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
 267 {
 268         struct drm_device *dev = crtc->dev;
 269         struct drm_crtc *c;
 270
 271         drm_for_each_crtc(c, dev) {
 272                 if (crtc->base.id == c->base.id)
 273                         return c->primary->fb;
 274         }
 275
 276         return NULL;
 277 }
 278
 279 /**
 280  * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
 281  * @info: fbdev registered by the helper
 282  */
 283 int drm_fb_helper_debug_leave(struct fb_info *info)
 284 {
 285         struct drm_fb_helper *helper = info->par;
 286         struct drm_crtc *crtc;
 287         const struct drm_crtc_helper_funcs *funcs;
 288         struct drm_framebuffer *fb;
 289         int i;
 290
 291         for (i = 0; i < helper->crtc_count; i++) {
 292                 struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
 293                 crtc = mode_set->crtc;
 294                 funcs = crtc->helper_private;
 295                 fb = drm_mode_config_fb(crtc);
 296
 297                 if (!crtc->enabled)
 298                         continue;
 299
 300                 if (!fb) {
 301                         DRM_ERROR("no fb to restore??\n");
 302                         continue;
 303                 }
 304
 305                 drm_fb_helper_restore_lut_atomic(mode_set->crtc);
 306                 funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
 307                                             crtc->y, LEAVE_ATOMIC_MODE_SET);
 308         }
 309
 310         return 0;
 311 }
 312 EXPORT_SYMBOL(drm_fb_helper_debug_leave);
 313
 314 static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
 315 {
 316         struct drm_device *dev = fb_helper->dev;
 317         struct drm_plane *plane;
 318         struct drm_atomic_state *state;
 319         int i, ret;
 320         unsigned plane_mask;
 321
 322         state = drm_atomic_state_alloc(dev);
 323         if (!state)
 324                 return -ENOMEM;
 325
 326         state->acquire_ctx = dev->mode_config.acquire_ctx;
 327 retry:
 328         plane_mask = 0;
 329         drm_for_each_plane(plane, dev) {
 330                 struct drm_plane_state *plane_state;
 331
 332                 plane_state = drm_atomic_get_plane_state(state, plane);
 333                 if (IS_ERR(plane_state)) {
 334                         ret = PTR_ERR(plane_state);
 335                         goto fail;
 336                 }
 337
 338                 plane_state->rotation = DRM_ROTATE_0;
 339
 340                 plane->old_fb = plane->fb;
 341                 plane_mask |= 1 << drm_plane_index(plane);
 342
 343                 /* disable non-primary: */
 344                 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
 345                         continue;
 346
 347                 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
 348                 if (ret != 0)
 349                         goto fail;
 350         }
 351
 352         for(i = 0; i < fb_helper->crtc_count; i++) {
 353                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 354
 355                 ret = __drm_atomic_helper_set_config(mode_set, state);
 356                 if (ret != 0)
 357                         goto fail;
 358         }
 359
 360         ret = drm_atomic_commit(state);
 361
 362 fail:
 363         drm_atomic_clean_old_fb(dev, plane_mask, ret);
 364
 365         if (ret == -EDEADLK)
 366                 goto backoff;
 367
 368         if (ret != 0)
 369                 drm_atomic_state_free(state);
 370
 371         return ret;
 372
 373 backoff:
 374         drm_atomic_state_clear(state);
 375         drm_atomic_legacy_backoff(state);
 376
 377         goto retry;
 378 }
 379
 380 static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
 381 {
 382         struct drm_device *dev = fb_helper->dev;
 383         struct drm_plane *plane;
 384         int i;
 385
 386         drm_warn_on_modeset_not_all_locked(dev);
 387
 388         if (dev->mode_config.funcs->atomic_commit)
 389                 return restore_fbdev_mode_atomic(fb_helper);
 390
 391         drm_for_each_plane(plane, dev) {
 392                 if (plane->type != DRM_PLANE_TYPE_PRIMARY)
 393                         drm_plane_force_disable(plane);
 394
 395                 if (dev->mode_config.rotation_property) {
 396                         drm_mode_plane_set_obj_prop(plane,
 397                                                     dev->mode_config.rotation_property,
 398                                                     DRM_ROTATE_0);
 399                 }
 400         }
 401
 402         for (i = 0; i < fb_helper->crtc_count; i++) {
 403                 struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
 404                 struct drm_crtc *crtc = mode_set->crtc;
 405                 int ret;
 406
 407                 if (crtc->funcs->cursor_set2) {
 408                         ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0);
 409                         if (ret)
 410                                 return ret;
 411                 } else if (crtc->funcs->cursor_set) {
 412                         ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0);
 413                         if (ret)
 414                                 return ret;
 415                 }
 416
 417                 ret = drm_mode_set_config_internal(mode_set);
 418                 if (ret)
 419                         return ret;
 420         }
 421
 422         return 0;
 423 }
 424
 425 /**
 426  * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
 427  * @fb_helper: fbcon to restore
 428  *
 429  * This should be called from driver's drm ->lastclose callback
 430  * when implementing an fbcon on top of kms using this helper. This ensures that
 431  * the user isn't greeted with a black screen when e.g. X dies.
 432  *
 433  * RETURNS:
 434  * Zero if everything went ok, negative error code otherwise.
 435  */
 436 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 437 {
 438         struct drm_device *dev = fb_helper->dev;
 439         bool do_delayed;
 440         int ret;
 441
 442         if (!drm_fbdev_emulation)
 443                 return -ENODEV;
 444
 445         drm_modeset_lock_all(dev);
 446         ret = restore_fbdev_mode(fb_helper);
 447
 448         do_delayed = fb_helper->delayed_hotplug;
 449         if (do_delayed)
 450                 fb_helper->delayed_hotplug = false;
 451         drm_modeset_unlock_all(dev);
 452
 453         if (do_delayed)
 454                 drm_fb_helper_hotplug_event(fb_helper);
 455         return ret;
 456 }
 457 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 458
 459 static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)
 460 {
 461         struct drm_device *dev = fb_helper->dev;
 462         struct drm_crtc *crtc;
 463         int bound = 0, crtcs_bound = 0;
 464
 465         /* Sometimes user space wants everything disabled, so don't steal the
 466          * display if there's a master. */
 467         if (lockless_dereference(dev->master))
 468                 return false;
 469
 470         drm_for_each_crtc(crtc, dev) {
 471                 if (crtc->primary->fb)
 472                         crtcs_bound++;
 473                 if (crtc->primary->fb == fb_helper->fb)
 474                         bound++;
 475         }
 476
 477         if (bound < crtcs_bound)
 478                 return false;
 479
 480         return true;
 481 }
 482
 483 #ifdef CONFIG_MAGIC_SYSRQ
 484 /*
 485  * restore fbcon display for all kms driver's using this helper, used for sysrq
 486  * and panic handling.
 487  */
 488 static bool drm_fb_helper_force_kernel_mode(void)
 489 {
 490         bool ret, error = false;
 491         struct drm_fb_helper *helper;
 492
 493         if (list_empty(&kernel_fb_helper_list))
 494                 return false;
 495
 496         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 497                 struct drm_device *dev = helper->dev;
 498
 499                 if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 500                         continue;
 501
 502                 drm_modeset_lock_all(dev);
 503                 ret = restore_fbdev_mode(helper);
 504                 if (ret)
 505                         error = true;
 506                 drm_modeset_unlock_all(dev);
 507         }
 508         return error;
 509 }
 510
 511 static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
 512 {
 513         bool ret;
 514         ret = drm_fb_helper_force_kernel_mode();
 515         if (ret == true)
 516                 DRM_ERROR("Failed to restore crtc configuration\n");
 517 }
 518 static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
 519
 520 static void drm_fb_helper_sysrq(int dummy1)
 521 {
 522         schedule_work(&drm_fb_helper_restore_work);
 523 }
 524
 525 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
 526         .handler = drm_fb_helper_sysrq,
 527         .help_msg = "force-fb(V)",
 528         .action_msg = "Restore framebuffer console",
 529 };
 530 #else
 531 static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
 532 #endif
 533
 534 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 535 {
 536         struct drm_fb_helper *fb_helper = info->par;
 537         struct drm_device *dev = fb_helper->dev;
 538         struct drm_crtc *crtc;
 539         struct drm_connector *connector;
 540         int i, j;
 541
 542         /*
 543          * For each CRTC in this fb, turn the connectors on/off.
 544          */
 545         drm_modeset_lock_all(dev);
 546         if (!drm_fb_helper_is_bound(fb_helper)) {
 547                 drm_modeset_unlock_all(dev);
 548                 return;
 549         }
 550
 551         for (i = 0; i < fb_helper->crtc_count; i++) {
 552                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
 553
 554                 if (!crtc->enabled)
 555                         continue;
 556
 557                 /* Walk the connectors & encoders on this fb turning them on/off */
 558                 for (j = 0; j < fb_helper->connector_count; j++) {
 559                         connector = fb_helper->connector_info[j]->connector;
 560                         connector->funcs->dpms(connector, dpms_mode);
 561                         drm_object_property_set_value(&connector->base,
 562                                 dev->mode_config.dpms_property, dpms_mode);
 563                 }
 564         }
 565         drm_modeset_unlock_all(dev);
 566 }
 567
 568 /**
 569  * drm_fb_helper_blank - implementation for ->fb_blank
 570  * @blank: desired blanking state
 571  * @info: fbdev registered by the helper
 572  */
 573 int drm_fb_helper_blank(int blank, struct fb_info *info)
 574 {
 575         if (oops_in_progress)
 576                 return -EBUSY;
 577
 578         switch (blank) {
 579         /* Display: On; HSync: On, VSync: On */
 580         case FB_BLANK_UNBLANK:
 581                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON);
 582                 break;
 583         /* Display: Off; HSync: On, VSync: On */
 584         case FB_BLANK_NORMAL:
 585                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 586                 break;
 587         /* Display: Off; HSync: Off, VSync: On */
 588         case FB_BLANK_HSYNC_SUSPEND:
 589                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);
 590                 break;
 591         /* Display: Off; HSync: On, VSync: Off */
 592         case FB_BLANK_VSYNC_SUSPEND:
 593                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);
 594                 break;
 595         /* Display: Off; HSync: Off, VSync: Off */
 596         case FB_BLANK_POWERDOWN:
 597                 drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF);
 598                 break;
 599         }
 600         return 0;
 601 }
 602 EXPORT_SYMBOL(drm_fb_helper_blank);
 603
 604 static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
 605 {
 606         int i;
 607
 608         for (i = 0; i < helper->connector_count; i++) {
 609                 drm_connector_unreference(helper->connector_info[i]->connector);
 610                 kfree(helper->connector_info[i]);
 611         }
 612         kfree(helper->connector_info);
 613         for (i = 0; i < helper->crtc_count; i++) {
 614                 kfree(helper->crtc_info[i].mode_set.connectors);
 615                 if (helper->crtc_info[i].mode_set.mode)
 616                         drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);
 617         }
 618         kfree(helper->crtc_info);
 619 }
 620
 621 static void drm_fb_helper_resume_worker(struct work_struct *work)
 622 {
 623         struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
 624                                                     resume_work);
 625
 626         console_lock();
 627         fb_set_suspend(helper->fbdev, 0);
 628         console_unlock();
 629 }
 630
 631 static void drm_fb_helper_dirty_work(struct work_struct *work)
 632 {
 633         struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
 634                                                     dirty_work);
 635         struct drm_clip_rect *clip = &helper->dirty_clip;
 636         struct drm_clip_rect clip_copy;
 637         unsigned long flags;
 638
 639         spin_lock_irqsave(&helper->dirty_lock, flags);
 640         clip_copy = *clip;
 641         clip->x1 = clip->y1 = ~0;
 642         clip->x2 = clip->y2 = 0;
 643         spin_unlock_irqrestore(&helper->dirty_lock, flags);
 644
 645         helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1);
 646 }
 647
 648 /**
 649  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 650  * @dev: DRM device
 651  * @helper: driver-allocated fbdev helper structure to set up
 652  * @funcs: pointer to structure of functions associate with this helper
 653  *
 654  * Sets up the bare minimum to make the framebuffer helper usable. This is
 655  * useful to implement race-free initialization of the polling helpers.
 656  */
 657 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 658                            const struct drm_fb_helper_funcs *funcs)
 659 {
 660         INIT_LIST_HEAD(&helper->kernel_fb_list);
 661         spin_lock_init(&helper->dirty_lock);
 662         INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
 663         INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
 664         helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
 665         helper->funcs = funcs;
 666         helper->dev = dev;
 667 }
 668 EXPORT_SYMBOL(drm_fb_helper_prepare);
 669
 670 /**
 671  * drm_fb_helper_init - initialize a drm_fb_helper structure
 672  * @dev: drm device
 673  * @fb_helper: driver-allocated fbdev helper structure to initialize
 674  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 675  * @max_conn_count: max connector count
 676  *
 677  * This allocates the structures for the fbdev helper with the given limits.
 678  * Note that this won't yet touch the hardware (through the driver interfaces)
 679  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 680  * to allow driver writes more control over the exact init sequence.
 681  *
 682  * Drivers must call drm_fb_helper_prepare() before calling this function.
 683  *
 684  * RETURNS:
 685  * Zero if everything went ok, nonzero otherwise.
 686  */
 687 int drm_fb_helper_init(struct drm_device *dev,
 688                        struct drm_fb_helper *fb_helper,
 689                        int crtc_count, int max_conn_count)
 690 {
 691         struct drm_crtc *crtc;
 692         int i;
 693
 694         if (!drm_fbdev_emulation)
 695                 return 0;
 696
 697         if (!max_conn_count)
 698                 return -EINVAL;
 699
 700         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 701         if (!fb_helper->crtc_info)
 702                 return -ENOMEM;
 703
 704         fb_helper->crtc_count = crtc_count;
 705         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 706         if (!fb_helper->connector_info) {
 707                 kfree(fb_helper->crtc_info);
 708                 return -ENOMEM;
 709         }
 710         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 711         fb_helper->connector_count = 0;
 712
 713         for (i = 0; i < crtc_count; i++) {
 714                 fb_helper->crtc_info[i].mode_set.connectors =
 715                         kcalloc(max_conn_count,
 716                                 sizeof(struct drm_connector *),
 717                                 GFP_KERNEL);
 718
 719                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 720                         goto out_free;
 721                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 722         }
 723
 724         i = 0;
 725         drm_for_each_crtc(crtc, dev) {
 726                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 727                 i++;
 728         }
 729
 730         return 0;
 731 out_free:
 732         drm_fb_helper_crtc_free(fb_helper);
 733         return -ENOMEM;
 734 }
 735 EXPORT_SYMBOL(drm_fb_helper_init);
 736
 737 /**
 738  * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
 739  * @fb_helper: driver-allocated fbdev helper
 740  *
 741  * A helper to alloc fb_info and the members cmap and apertures. Called
 742  * by the driver within the fb_probe fb_helper callback function.
 743  *
 744  * RETURNS:
 745  * fb_info pointer if things went okay, pointer containing error code
 746  * otherwise
 747  */
 748 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 749 {
 750         struct device *dev = fb_helper->dev->dev;
 751         struct fb_info *info;
 752         int ret;
 753
 754         info = framebuffer_alloc(0, dev);
 755         if (!info)
 756                 return ERR_PTR(-ENOMEM);
 757
 758         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 759         if (ret)
 760                 goto err_release;
 761
 762         info->apertures = alloc_apertures(1);
 763         if (!info->apertures) {
 764                 ret = -ENOMEM;
 765                 goto err_free_cmap;
 766         }
 767
 768         fb_helper->fbdev = info;
 769
 770         return info;
 771
 772 err_free_cmap:
 773         fb_dealloc_cmap(&info->cmap);
 774 err_release:
 775         framebuffer_release(info);
 776         return ERR_PTR(ret);
 777 }
 778 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
 779
 780 /**
 781  * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
 782  * @fb_helper: driver-allocated fbdev helper
 783  *
 784  * A wrapper around unregister_framebuffer, to release the fb_info
 785  * framebuffer device
 786  */
 787 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 788 {
 789         if (fb_helper && fb_helper->fbdev)
 790                 unregister_framebuffer(fb_helper->fbdev);
 791 }
 792 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
 793
 794 /**
 795  * drm_fb_helper_release_fbi - dealloc fb_info and its members
 796  * @fb_helper: driver-allocated fbdev helper
 797  *
 798  * A helper to free memory taken by fb_info and the members cmap and
 799  * apertures
 800  */
 801 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 802 {
 803         if (fb_helper) {
 804                 struct fb_info *info = fb_helper->fbdev;
 805
 806                 if (info) {
 807                         if (info->cmap.len)
 808                                 fb_dealloc_cmap(&info->cmap);
 809                         framebuffer_release(info);
 810                 }
 811
 812                 fb_helper->fbdev = NULL;
 813         }
 814 }
 815 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
 816
 817 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 818 {
 819         if (!drm_fbdev_emulation)
 820                 return;
 821
 822         if (!list_empty(&fb_helper->kernel_fb_list)) {
 823                 list_del(&fb_helper->kernel_fb_list);
 824                 if (list_empty(&kernel_fb_helper_list)) {
 825                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 826                 }
 827         }
 828
 829         drm_fb_helper_crtc_free(fb_helper);
 830
 831 }
 832 EXPORT_SYMBOL(drm_fb_helper_fini);
 833
 834 /**
 835  * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
 836  * @fb_helper: driver-allocated fbdev helper
 837  *
 838  * A wrapper around unlink_framebuffer implemented by fbdev core
 839  */
 840 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 841 {
 842         if (fb_helper && fb_helper->fbdev)
 843                 unlink_framebuffer(fb_helper->fbdev);
 844 }
 845 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
 846
 847 static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
 848                                 u32 width, u32 height)
 849 {
 850         struct drm_fb_helper *helper = info->par;
 851         struct drm_clip_rect *clip = &helper->dirty_clip;
 852         unsigned long flags;
 853
 854         if (!helper->fb->funcs->dirty)
 855                 return;
 856
 857         spin_lock_irqsave(&helper->dirty_lock, flags);
 858         clip->x1 = min_t(u32, clip->x1, x);
 859         clip->y1 = min_t(u32, clip->y1, y);
 860         clip->x2 = max_t(u32, clip->x2, x + width);
 861         clip->y2 = max_t(u32, clip->y2, y + height);
 862         spin_unlock_irqrestore(&helper->dirty_lock, flags);
 863
 864         schedule_work(&helper->dirty_work);
 865 }
 866
 867 /**
 868  * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
 869  * @info: fb_info struct pointer
 870  * @pagelist: list of dirty mmap framebuffer pages
 871  *
 872  * This function is used as the &fb_deferred_io ->deferred_io
 873  * callback function for flushing the fbdev mmap writes.
 874  */
 875 void drm_fb_helper_deferred_io(struct fb_info *info,
 876                                struct list_head *pagelist)
 877 {
 878         unsigned long start, end, min, max;
 879         struct page *page;
 880         u32 y1, y2;
 881
 882         min = ULONG_MAX;
 883         max = 0;
 884         list_for_each_entry(page, pagelist, lru) {
 885                 start = page->index << PAGE_SHIFT;
 886                 end = start + PAGE_SIZE - 1;
 887                 min = min(min, start);
 888                 max = max(max, end);
 889         }
 890
 891         if (min < max) {
 892                 y1 = min / info->fix.line_length;
 893                 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length),
 894                            info->var.yres);
 895                 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1);
 896         }
 897 }
 898 EXPORT_SYMBOL(drm_fb_helper_deferred_io);
 899
 900 /**
 901  * drm_fb_helper_sys_read - wrapper around fb_sys_read
 902  * @info: fb_info struct pointer
 903  * @buf: userspace buffer to read from framebuffer memory
 904  * @count: number of bytes to read from framebuffer memory
 905  * @ppos: read offset within framebuffer memory
 906  *
 907  * A wrapper around fb_sys_read implemented by fbdev core
 908  */
 909 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 910                                size_t count, loff_t *ppos)
 911 {
 912         return fb_sys_read(info, buf, count, ppos);
 913 }
 914 EXPORT_SYMBOL(drm_fb_helper_sys_read);
 915
 916 /**
 917  * drm_fb_helper_sys_write - wrapper around fb_sys_write
 918  * @info: fb_info struct pointer
 919  * @buf: userspace buffer to write to framebuffer memory
 920  * @count: number of bytes to write to framebuffer memory
 921  * @ppos: write offset within framebuffer memory
 922  *
 923  * A wrapper around fb_sys_write implemented by fbdev core
 924  */
 925 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 926                                 size_t count, loff_t *ppos)
 927 {
 928         ssize_t ret;
 929
 930         ret = fb_sys_write(info, buf, count, ppos);
 931         if (ret > 0)
 932                 drm_fb_helper_dirty(info, 0, 0, info->var.xres,
 933                                     info->var.yres);
 934
 935         return ret;
 936 }
 937 EXPORT_SYMBOL(drm_fb_helper_sys_write);
 938
 939 /**
 940  * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
 941  * @info: fbdev registered by the helper
 942  * @rect: info about rectangle to fill
 943  *
 944  * A wrapper around sys_fillrect implemented by fbdev core
 945  */
 946 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 947                                 const struct fb_fillrect *rect)
 948 {
 949         sys_fillrect(info, rect);
 950         drm_fb_helper_dirty(info, rect->dx, rect->dy,
 951                             rect->width, rect->height);
 952 }
 953 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
 954
 955 /**
 956  * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
 957  * @info: fbdev registered by the helper
 958  * @area: info about area to copy
 959  *
 960  * A wrapper around sys_copyarea implemented by fbdev core
 961  */
 962 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 963                                 const struct fb_copyarea *area)
 964 {
 965         sys_copyarea(info, area);
 966         drm_fb_helper_dirty(info, area->dx, area->dy,
 967                             area->width, area->height);
 968 }
 969 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
 970
 971 /**
 972  * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
 973  * @info: fbdev registered by the helper
 974  * @image: info about image to blit
 975  *
 976  * A wrapper around sys_imageblit implemented by fbdev core
 977  */
 978 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 979                                  const struct fb_image *image)
 980 {
 981         sys_imageblit(info, image);
 982         drm_fb_helper_dirty(info, image->dx, image->dy,
 983                             image->width, image->height);
 984 }
 985 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
 986
 987 /**
 988  * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
 989  * @info: fbdev registered by the helper
 990  * @rect: info about rectangle to fill
 991  *
 992  * A wrapper around cfb_imageblit implemented by fbdev core
 993  */
 994 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 995                                 const struct fb_fillrect *rect)
 996 {
 997         cfb_fillrect(info, rect);
 998         drm_fb_helper_dirty(info, rect->dx, rect->dy,
 999                             rect->width, rect->height);
1000 }
1001 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
1002
1003 /**
1004  * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
1005  * @info: fbdev registered by the helper
1006  * @area: info about area to copy
1007  *
1008  * A wrapper around cfb_copyarea implemented by fbdev core
1009  */
1010 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
1011                                 const struct fb_copyarea *area)
1012 {
1013         cfb_copyarea(info, area);
1014         drm_fb_helper_dirty(info, area->dx, area->dy,
1015                             area->width, area->height);
1016 }
1017 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
1018
1019 /**
1020  * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1021  * @info: fbdev registered by the helper
1022  * @image: info about image to blit
1023  *
1024  * A wrapper around cfb_imageblit implemented by fbdev core
1025  */
1026 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
1027                                  const struct fb_image *image)
1028 {
1029         cfb_imageblit(info, image);
1030         drm_fb_helper_dirty(info, image->dx, image->dy,
1031                             image->width, image->height);
1032 }
1033 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
1034
1035 /**
1036  * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1037  * @fb_helper: driver-allocated fbdev helper
1038  * @suspend: whether to suspend or resume
1039  *
1040  * A wrapper around fb_set_suspend implemented by fbdev core.
1041  * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take
1042  * the lock yourself
1043  */
1044 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
1045 {
1046         if (fb_helper && fb_helper->fbdev)
1047                 fb_set_suspend(fb_helper->fbdev, suspend);
1048 }
1049 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
1050
1051 /**
1052  * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also
1053  *                                      takes the console lock
1054  * @fb_helper: driver-allocated fbdev helper
1055  * @suspend: whether to suspend or resume
1056  *
1057  * A wrapper around fb_set_suspend() that takes the console lock. If the lock
1058  * isn't available on resume, a worker is tasked with waiting for the lock
1059  * to become available. The console lock can be pretty contented on resume
1060  * due to all the printk activity.
1061  *
1062  * This function can be called multiple times with the same state since
1063  * &fb_info->state is checked to see if fbdev is running or not before locking.
1064  *
1065  * Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
1066  */
1067 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
1068                                         bool suspend)
1069 {
1070         if (!fb_helper || !fb_helper->fbdev)
1071                 return;
1072
1073         /* make sure there's no pending/ongoing resume */
1074         flush_work(&fb_helper->resume_work);
1075
1076         if (suspend) {
1077                 if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING)
1078                         return;
1079
1080                 console_lock();
1081
1082         } else {
1083                 if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING)
1084                         return;
1085
1086                 if (!console_trylock()) {
1087                         schedule_work(&fb_helper->resume_work);
1088                         return;
1089                 }
1090         }
1091
1092         fb_set_suspend(fb_helper->fbdev, suspend);
1093         console_unlock();
1094 }
1095 EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);
1096
1097 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
1098                      u16 blue, u16 regno, struct fb_info *info)
1099 {
1100         struct drm_fb_helper *fb_helper = info->par;
1101         struct drm_framebuffer *fb = fb_helper->fb;
1102
1103         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
1104                 u32 *palette;
1105                 u32 value;
1106                 /* place color in psuedopalette */
1107                 if (regno > 16)
1108                         return -EINVAL;
1109                 palette = (u32 *)info->pseudo_palette;
1110                 red >>= (16 - info->var.red.length);
1111                 green >>= (16 - info->var.green.length);
1112                 blue >>= (16 - info->var.blue.length);
1113                 value = (red << info->var.red.offset) |
1114                         (green << info->var.green.offset) |
1115                         (blue << info->var.blue.offset);
1116                 if (info->var.transp.length > 0) {
1117                         u32 mask = (1 << info->var.transp.length) - 1;
1118                         mask <<= info->var.transp.offset;
1119                         value |= mask;
1120                 }
1121                 palette[regno] = value;
1122                 return 0;
1123         }
1124
1125         /*
1126          * The driver really shouldn't advertise pseudo/directcolor
1127          * visuals if it can't deal with the palette.
1128          */
1129         if (WARN_ON(!fb_helper->funcs->gamma_set ||
1130                     !fb_helper->funcs->gamma_get))
1131                 return -EINVAL;
1132
1133         WARN_ON(fb->bits_per_pixel != 8);
1134
1135         fb_helper->funcs->gamma_set(crtc, red, green, blue, regno);
1136
1137         return 0;
1138 }
1139
1140 /**
1141  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
1142  * @cmap: cmap to set
1143  * @info: fbdev registered by the helper
1144  */
1145 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1146 {
1147         struct drm_fb_helper *fb_helper = info->par;
1148         struct drm_device *dev = fb_helper->dev;
1149         const struct drm_crtc_helper_funcs *crtc_funcs;
1150         u16 *red, *green, *blue, *transp;
1151         struct drm_crtc *crtc;
1152         int i, j, rc = 0;
1153         int start;
1154
1155         if (oops_in_progress)
1156                 return -EBUSY;
1157
1158         drm_modeset_lock_all(dev);
1159         if (!drm_fb_helper_is_bound(fb_helper)) {
1160                 drm_modeset_unlock_all(dev);
1161                 return -EBUSY;
1162         }
1163
1164         for (i = 0; i < fb_helper->crtc_count; i++) {
1165                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
1166                 crtc_funcs = crtc->helper_private;
1167
1168                 red = cmap->red;
1169                 green = cmap->green;
1170                 blue = cmap->blue;
1171                 transp = cmap->transp;
1172                 start = cmap->start;
1173
1174                 for (j = 0; j < cmap->len; j++) {
1175                         u16 hred, hgreen, hblue, htransp = 0xffff;
1176
1177                         hred = *red++;
1178                         hgreen = *green++;
1179                         hblue = *blue++;
1180
1181                         if (transp)
1182                                 htransp = *transp++;
1183
1184                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
1185                         if (rc)
1186                                 goto out;
1187                 }
1188                 if (crtc_funcs->load_lut)
1189                         crtc_funcs->load_lut(crtc);
1190         }
1191  out:
1192         drm_modeset_unlock_all(dev);
1193         return rc;
1194 }
1195 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1196
1197 /**
1198  * drm_fb_helper_check_var - implementation for ->fb_check_var
1199  * @var: screeninfo to check
1200  * @info: fbdev registered by the helper
1201  */
1202 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1203                             struct fb_info *info)
1204 {
1205         struct drm_fb_helper *fb_helper = info->par;
1206         struct drm_framebuffer *fb = fb_helper->fb;
1207         int depth;
1208
1209         if (var->pixclock != 0 || in_dbg_master())
1210                 return -EINVAL;
1211
1212         /* Need to resize the fb object !!! */
1213         if (var->bits_per_pixel > fb->bits_per_pixel ||
1214             var->xres > fb->width || var->yres > fb->height ||
1215             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1216                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1217                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1218                           var->xres, var->yres, var->bits_per_pixel,
1219                           var->xres_virtual, var->yres_virtual,
1220                           fb->width, fb->height, fb->bits_per_pixel);
1221                 return -EINVAL;
1222         }
1223
1224         switch (var->bits_per_pixel) {
1225         case 16:
1226                 depth = (var->green.length == 6) ? 16 : 15;
1227                 break;
1228         case 32:
1229                 depth = (var->transp.length > 0) ? 32 : 24;
1230                 break;
1231         default:
1232                 depth = var->bits_per_pixel;
1233                 break;
1234         }
1235
1236         switch (depth) {
1237         case 8:
1238                 var->red.offset = 0;
1239                 var->green.offset = 0;
1240                 var->blue.offset = 0;
1241                 var->red.length = 8;
1242                 var->green.length = 8;
1243                 var->blue.length = 8;
1244                 var->transp.length = 0;
1245                 var->transp.offset = 0;
1246                 break;
1247         case 15:
1248                 var->red.offset = 10;
1249                 var->green.offset = 5;
1250                 var->blue.offset = 0;
1251                 var->red.length = 5;
1252                 var->green.length = 5;
1253                 var->blue.length = 5;
1254                 var->transp.length = 1;
1255                 var->transp.offset = 15;
1256                 break;
1257         case 16:
1258                 var->red.offset = 11;
1259                 var->green.offset = 5;
1260                 var->blue.offset = 0;
1261                 var->red.length = 5;
1262                 var->green.length = 6;
1263                 var->blue.length = 5;
1264                 var->transp.length = 0;
1265                 var->transp.offset = 0;
1266                 break;
1267         case 24:
1268                 var->red.offset = 16;
1269                 var->green.offset = 8;
1270                 var->blue.offset = 0;
1271                 var->red.length = 8;
1272                 var->green.length = 8;
1273                 var->blue.length = 8;
1274                 var->transp.length = 0;
1275                 var->transp.offset = 0;
1276                 break;
1277         case 32:
1278                 var->red.offset = 16;
1279                 var->green.offset = 8;
1280                 var->blue.offset = 0;
1281                 var->red.length = 8;
1282                 var->green.length = 8;
1283                 var->blue.length = 8;
1284                 var->transp.length = 8;
1285                 var->transp.offset = 24;
1286                 break;
1287         default:
1288                 return -EINVAL;
1289         }
1290         return 0;
1291 }
1292 EXPORT_SYMBOL(drm_fb_helper_check_var);
1293
1294 /**
1295  * drm_fb_helper_set_par - implementation for ->fb_set_par
1296  * @info: fbdev registered by the helper
1297  *
1298  * This will let fbcon do the mode init and is called at initialization time by
1299  * the fbdev core when registering the driver, and later on through the hotplug
1300  * callback.
1301  */
1302 int drm_fb_helper_set_par(struct fb_info *info)
1303 {
1304         struct drm_fb_helper *fb_helper = info->par;
1305         struct fb_var_screeninfo *var = &info->var;
1306
1307         if (oops_in_progress)
1308                 return -EBUSY;
1309
1310         if (var->pixclock != 0) {
1311                 DRM_ERROR("PIXEL CLOCK SET\n");
1312                 return -EINVAL;
1313         }
1314
1315         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1316
1317         return 0;
1318 }
1319 EXPORT_SYMBOL(drm_fb_helper_set_par);
1320
1321 static int pan_display_atomic(struct fb_var_screeninfo *var,
1322                               struct fb_info *info)
1323 {
1324         struct drm_fb_helper *fb_helper = info->par;
1325         struct drm_device *dev = fb_helper->dev;
1326         struct drm_atomic_state *state;
1327         struct drm_plane *plane;
1328         int i, ret;
1329         unsigned plane_mask;
1330
1331         state = drm_atomic_state_alloc(dev);
1332         if (!state)
1333                 return -ENOMEM;
1334
1335         state->acquire_ctx = dev->mode_config.acquire_ctx;
1336 retry:
1337         plane_mask = 0;
1338         for(i = 0; i < fb_helper->crtc_count; i++) {
1339                 struct drm_mode_set *mode_set;
1340
1341                 mode_set = &fb_helper->crtc_info[i].mode_set;
1342
1343                 mode_set->x = var->xoffset;
1344                 mode_set->y = var->yoffset;
1345
1346                 ret = __drm_atomic_helper_set_config(mode_set, state);
1347                 if (ret != 0)
1348                         goto fail;
1349
1350                 plane = mode_set->crtc->primary;
1351                 plane_mask |= (1 << drm_plane_index(plane));
1352                 plane->old_fb = plane->fb;
1353         }
1354
1355         ret = drm_atomic_commit(state);
1356         if (ret != 0)
1357                 goto fail;
1358
1359         info->var.xoffset = var->xoffset;
1360         info->var.yoffset = var->yoffset;
1361
1362
1363 fail:
1364         drm_atomic_clean_old_fb(dev, plane_mask, ret);
1365
1366         if (ret == -EDEADLK)
1367                 goto backoff;
1368
1369         if (ret != 0)
1370                 drm_atomic_state_free(state);
1371
1372         return ret;
1373
1374 backoff:
1375         drm_atomic_state_clear(state);
1376         drm_atomic_legacy_backoff(state);
1377
1378         goto retry;
1379 }
1380
1381 /**
1382  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1383  * @var: updated screen information
1384  * @info: fbdev registered by the helper
1385  */
1386 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1387                               struct fb_info *info)
1388 {
1389         struct drm_fb_helper *fb_helper = info->par;
1390         struct drm_device *dev = fb_helper->dev;
1391         struct drm_mode_set *modeset;
1392         int ret = 0;
1393         int i;
1394
1395         if (oops_in_progress)
1396                 return -EBUSY;
1397
1398         drm_modeset_lock_all(dev);
1399         if (!drm_fb_helper_is_bound(fb_helper)) {
1400                 drm_modeset_unlock_all(dev);
1401                 return -EBUSY;
1402         }
1403
1404         if (dev->mode_config.funcs->atomic_commit) {
1405                 ret = pan_display_atomic(var, info);
1406                 goto unlock;
1407         }
1408
1409         for (i = 0; i < fb_helper->crtc_count; i++) {
1410                 modeset = &fb_helper->crtc_info[i].mode_set;
1411
1412                 modeset->x = var->xoffset;
1413                 modeset->y = var->yoffset;
1414
1415                 if (modeset->num_connectors) {
1416                         ret = drm_mode_set_config_internal(modeset);
1417                         if (!ret) {
1418                                 info->var.xoffset = var->xoffset;
1419                                 info->var.yoffset = var->yoffset;
1420                         }
1421                 }
1422         }
1423 unlock:
1424         drm_modeset_unlock_all(dev);
1425         return ret;
1426 }
1427 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1428
1429 /*
1430  * Allocates the backing storage and sets up the fbdev info structure through
1431  * the ->fb_probe callback and then registers the fbdev and sets up the panic
1432  * notifier.
1433  */
1434 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1435                                          int preferred_bpp)
1436 {
1437         int ret = 0;
1438         int crtc_count = 0;
1439         int i;
1440         struct fb_info *info;
1441         struct drm_fb_helper_surface_size sizes;
1442         int gamma_size = 0;
1443
1444         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1445         sizes.surface_depth = 24;
1446         sizes.surface_bpp = 32;
1447         sizes.fb_width = (unsigned)-1;
1448         sizes.fb_height = (unsigned)-1;
1449
1450         /* if driver picks 8 or 16 by default use that
1451            for both depth/bpp */
1452         if (preferred_bpp != sizes.surface_bpp)
1453                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1454
1455         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1456         for (i = 0; i < fb_helper->connector_count; i++) {
1457                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1458                 struct drm_cmdline_mode *cmdline_mode;
1459
1460                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1461
1462                 if (cmdline_mode->bpp_specified) {
1463                         switch (cmdline_mode->bpp) {
1464                         case 8:
1465                                 sizes.surface_depth = sizes.surface_bpp = 8;
1466                                 break;
1467                         case 15:
1468                                 sizes.surface_depth = 15;
1469                                 sizes.surface_bpp = 16;
1470                                 break;
1471                         case 16:
1472                                 sizes.surface_depth = sizes.surface_bpp = 16;
1473                                 break;
1474                         case 24:
1475                                 sizes.surface_depth = sizes.surface_bpp = 24;
1476                                 break;
1477                         case 32:
1478                                 sizes.surface_depth = 24;
1479                                 sizes.surface_bpp = 32;
1480                                 break;
1481                         }
1482                         break;
1483                 }
1484         }
1485
1486         crtc_count = 0;
1487         for (i = 0; i < fb_helper->crtc_count; i++) {
1488                 struct drm_display_mode *desired_mode;
1489                 struct drm_mode_set *mode_set;
1490                 int x, y, j;
1491                 /* in case of tile group, are we the last tile vert or horiz?
1492                  * If no tile group you are always the last one both vertically
1493                  * and horizontally
1494                  */
1495                 bool lastv = true, lasth = true;
1496
1497                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1498                 mode_set = &fb_helper->crtc_info[i].mode_set;
1499
1500                 if (!desired_mode)
1501                         continue;
1502
1503                 crtc_count++;
1504
1505                 x = fb_helper->crtc_info[i].x;
1506                 y = fb_helper->crtc_info[i].y;
1507
1508                 if (gamma_size == 0)
1509                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1510
1511                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1512                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1513
1514                 for (j = 0; j < mode_set->num_connectors; j++) {
1515                         struct drm_connector *connector = mode_set->connectors[j];
1516                         if (connector->has_tile) {
1517                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1518                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1519                                 /* cloning to multiple tiles is just crazy-talk, so: */
1520                                 break;
1521                         }
1522                 }
1523
1524                 if (lasth)
1525                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1526                 if (lastv)
1527                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1528         }
1529
1530         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1531                 /* hmm everyone went away - assume VGA cable just fell out
1532                    and will come back later. */
1533                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1534                 sizes.fb_width = sizes.surface_width = 1024;
1535                 sizes.fb_height = sizes.surface_height = 768;
1536         }
1537
1538         /* push down into drivers */
1539         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1540         if (ret < 0)
1541                 return ret;
1542
1543         info = fb_helper->fbdev;
1544
1545         /*
1546          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1547          * events, but at init time drm_setup_crtcs needs to be called before
1548          * the fb is allocated (since we need to figure out the desired size of
1549          * the fb before we can allocate it ...). Hence we need to fix things up
1550          * here again.
1551          */
1552         for (i = 0; i < fb_helper->crtc_count; i++)
1553                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1554                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1555
1556
1557         info->var.pixclock = 0;
1558         if (register_framebuffer(info) < 0)
1559                 return -EINVAL;
1560
1561         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1562                         info->node, info->fix.id);
1563
1564         if (list_empty(&kernel_fb_helper_list)) {
1565                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1566         }
1567
1568         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1569
1570         return 0;
1571 }
1572
1573 /**
1574  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1575  * @info: fbdev registered by the helper
1576  * @pitch: desired pitch
1577  * @depth: desired depth
1578  *
1579  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1580  * fbdev emulations. Drivers which support acceleration methods which impose
1581  * additional constraints need to set up their own limits.
1582  *
1583  * Drivers should call this (or their equivalent setup code) from their
1584  * ->fb_probe callback.
1585  */
1586 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1587                             uint32_t depth)
1588 {
1589         info->fix.type = FB_TYPE_PACKED_PIXELS;
1590         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1591                 FB_VISUAL_TRUECOLOR;
1592         info->fix.mmio_start = 0;
1593         info->fix.mmio_len = 0;
1594         info->fix.type_aux = 0;
1595         info->fix.xpanstep = 1; /* doing it in hw */
1596         info->fix.ypanstep = 1; /* doing it in hw */
1597         info->fix.ywrapstep = 0;
1598         info->fix.accel = FB_ACCEL_NONE;
1599
1600         info->fix.line_length = pitch;
1601         return;
1602 }
1603 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1604
1605 /**
1606  * drm_fb_helper_fill_var - initalizes variable fbdev information
1607  * @info: fbdev instance to set up
1608  * @fb_helper: fb helper instance to use as template
1609  * @fb_width: desired fb width
1610  * @fb_height: desired fb height
1611  *
1612  * Sets up the variable fbdev metainformation from the given fb helper instance
1613  * and the drm framebuffer allocated in fb_helper->fb.
1614  *
1615  * Drivers should call this (or their equivalent setup code) from their
1616  * ->fb_probe callback after having allocated the fbdev backing
1617  * storage framebuffer.
1618  */
1619 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1620                             uint32_t fb_width, uint32_t fb_height)
1621 {
1622         struct drm_framebuffer *fb = fb_helper->fb;
1623         info->pseudo_palette = fb_helper->pseudo_palette;
1624         info->var.xres_virtual = fb->width;
1625         info->var.yres_virtual = fb->height;
1626         info->var.bits_per_pixel = fb->bits_per_pixel;
1627         info->var.accel_flags = FB_ACCELF_TEXT;
1628         info->var.xoffset = 0;
1629         info->var.yoffset = 0;
1630         info->var.activate = FB_ACTIVATE_NOW;
1631         info->var.height = -1;
1632         info->var.width = -1;
1633
1634         switch (fb->depth) {
1635         case 8:
1636                 info->var.red.offset = 0;
1637                 info->var.green.offset = 0;
1638                 info->var.blue.offset = 0;
1639                 info->var.red.length = 8; /* 8bit DAC */
1640                 info->var.green.length = 8;
1641                 info->var.blue.length = 8;
1642                 info->var.transp.offset = 0;
1643                 info->var.transp.length = 0;
1644                 break;
1645         case 15:
1646                 info->var.red.offset = 10;
1647                 info->var.green.offset = 5;
1648                 info->var.blue.offset = 0;
1649                 info->var.red.length = 5;
1650                 info->var.green.length = 5;
1651                 info->var.blue.length = 5;
1652                 info->var.transp.offset = 15;
1653                 info->var.transp.length = 1;
1654                 break;
1655         case 16:
1656                 info->var.red.offset = 11;
1657                 info->var.green.offset = 5;
1658                 info->var.blue.offset = 0;
1659                 info->var.red.length = 5;
1660                 info->var.green.length = 6;
1661                 info->var.blue.length = 5;
1662                 info->var.transp.offset = 0;
1663                 break;
1664         case 24:
1665                 info->var.red.offset = 16;
1666                 info->var.green.offset = 8;
1667                 info->var.blue.offset = 0;
1668                 info->var.red.length = 8;
1669                 info->var.green.length = 8;
1670                 info->var.blue.length = 8;
1671                 info->var.transp.offset = 0;
1672                 info->var.transp.length = 0;
1673                 break;
1674         case 32:
1675                 info->var.red.offset = 16;
1676                 info->var.green.offset = 8;
1677                 info->var.blue.offset = 0;
1678                 info->var.red.length = 8;
1679                 info->var.green.length = 8;
1680                 info->var.blue.length = 8;
1681                 info->var.transp.offset = 24;
1682                 info->var.transp.length = 8;
1683                 break;
1684         default:
1685                 break;
1686         }
1687
1688         info->var.xres = fb_width;
1689         info->var.yres = fb_height;
1690 }
1691 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1692
1693 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1694                                                uint32_t maxX,
1695                                                uint32_t maxY)
1696 {
1697         struct drm_connector *connector;
1698         int count = 0;
1699         int i;
1700
1701         for (i = 0; i < fb_helper->connector_count; i++) {
1702                 connector = fb_helper->connector_info[i]->connector;
1703                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1704         }
1705
1706         return count;
1707 }
1708
1709 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1710 {
1711         struct drm_display_mode *mode;
1712
1713         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1714                 if (mode->hdisplay > width ||
1715                     mode->vdisplay > height)
1716                         continue;
1717                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1718                         return mode;
1719         }
1720         return NULL;
1721 }
1722 EXPORT_SYMBOL(drm_has_preferred_mode);
1723
1724 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1725 {
1726         return fb_connector->connector->cmdline_mode.specified;
1727 }
1728
1729 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1730                                                       int width, int height)
1731 {
1732         struct drm_cmdline_mode *cmdline_mode;
1733         struct drm_display_mode *mode;
1734         bool prefer_non_interlace;
1735
1736         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1737         if (cmdline_mode->specified == false)
1738                 return NULL;
1739
1740         /* attempt to find a matching mode in the list of modes
1741          *  we have gotten so far, if not add a CVT mode that conforms
1742          */
1743         if (cmdline_mode->rb || cmdline_mode->margins)
1744                 goto create_mode;
1745
1746         prefer_non_interlace = !cmdline_mode->interlace;
1747 again:
1748         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1749                 /* check width/height */
1750                 if (mode->hdisplay != cmdline_mode->xres ||
1751                     mode->vdisplay != cmdline_mode->yres)
1752                         continue;
1753
1754                 if (cmdline_mode->refresh_specified) {
1755                         if (mode->vrefresh != cmdline_mode->refresh)
1756                                 continue;
1757                 }
1758
1759                 if (cmdline_mode->interlace) {
1760                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1761                                 continue;
1762                 } else if (prefer_non_interlace) {
1763                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1764                                 continue;
1765                 }
1766                 return mode;
1767         }
1768
1769         if (prefer_non_interlace) {
1770                 prefer_non_interlace = false;
1771                 goto again;
1772         }
1773
1774 create_mode:
1775         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1776                                                  cmdline_mode);
1777         list_add(&mode->head, &fb_helper_conn->connector->modes);
1778         return mode;
1779 }
1780 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1781
1782 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1783 {
1784         bool enable;
1785
1786         if (strict)
1787                 enable = connector->status == connector_status_connected;
1788         else
1789                 enable = connector->status != connector_status_disconnected;
1790
1791         return enable;
1792 }
1793
1794 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1795                                   bool *enabled)
1796 {
1797         bool any_enabled = false;
1798         struct drm_connector *connector;
1799         int i = 0;
1800
1801         for (i = 0; i < fb_helper->connector_count; i++) {
1802                 connector = fb_helper->connector_info[i]->connector;
1803                 enabled[i] = drm_connector_enabled(connector, true);
1804                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1805                           enabled[i] ? "yes" : "no");
1806                 any_enabled |= enabled[i];
1807         }
1808
1809         if (any_enabled)
1810                 return;
1811
1812         for (i = 0; i < fb_helper->connector_count; i++) {
1813                 connector = fb_helper->connector_info[i]->connector;
1814                 enabled[i] = drm_connector_enabled(connector, false);
1815         }
1816 }
1817
1818 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1819                               struct drm_display_mode **modes,
1820                               struct drm_fb_offset *offsets,
1821                               bool *enabled, int width, int height)
1822 {
1823         int count, i, j;
1824         bool can_clone = false;
1825         struct drm_fb_helper_connector *fb_helper_conn;
1826         struct drm_display_mode *dmt_mode, *mode;
1827
1828         /* only contemplate cloning in the single crtc case */
1829         if (fb_helper->crtc_count > 1)
1830                 return false;
1831
1832         count = 0;
1833         for (i = 0; i < fb_helper->connector_count; i++) {
1834                 if (enabled[i])
1835                         count++;
1836         }
1837
1838         /* only contemplate cloning if more than one connector is enabled */
1839         if (count <= 1)
1840                 return false;
1841
1842         /* check the command line or if nothing common pick 1024x768 */
1843         can_clone = true;
1844         for (i = 0; i < fb_helper->connector_count; i++) {
1845                 if (!enabled[i])
1846                         continue;
1847                 fb_helper_conn = fb_helper->connector_info[i];
1848                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1849                 if (!modes[i]) {
1850                         can_clone = false;
1851                         break;
1852                 }
1853                 for (j = 0; j < i; j++) {
1854                         if (!enabled[j])
1855                                 continue;
1856                         if (!drm_mode_equal(modes[j], modes[i]))
1857                                 can_clone = false;
1858                 }
1859         }
1860
1861         if (can_clone) {
1862                 DRM_DEBUG_KMS("can clone using command line\n");
1863                 return true;
1864         }
1865
1866         /* try and find a 1024x768 mode on each connector */
1867         can_clone = true;
1868         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1869
1870         for (i = 0; i < fb_helper->connector_count; i++) {
1871
1872                 if (!enabled[i])
1873                         continue;
1874
1875                 fb_helper_conn = fb_helper->connector_info[i];
1876                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1877                         if (drm_mode_equal(mode, dmt_mode))
1878                                 modes[i] = mode;
1879                 }
1880                 if (!modes[i])
1881                         can_clone = false;
1882         }
1883
1884         if (can_clone) {
1885                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1886                 return true;
1887         }
1888         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1889         return false;
1890 }
1891
1892 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1893                                 struct drm_display_mode **modes,
1894                                 struct drm_fb_offset *offsets,
1895                                 int idx,
1896                                 int h_idx, int v_idx)
1897 {
1898         struct drm_fb_helper_connector *fb_helper_conn;
1899         int i;
1900         int hoffset = 0, voffset = 0;
1901
1902         for (i = 0; i < fb_helper->connector_count; i++) {
1903                 fb_helper_conn = fb_helper->connector_info[i];
1904                 if (!fb_helper_conn->connector->has_tile)
1905                         continue;
1906
1907                 if (!modes[i] && (h_idx || v_idx)) {
1908                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1909                                       fb_helper_conn->connector->base.id);
1910                         continue;
1911                 }
1912                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1913                         hoffset += modes[i]->hdisplay;
1914
1915                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1916                         voffset += modes[i]->vdisplay;
1917         }
1918         offsets[idx].x = hoffset;
1919         offsets[idx].y = voffset;
1920         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1921         return 0;
1922 }
1923
1924 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1925                                  struct drm_display_mode **modes,
1926                                  struct drm_fb_offset *offsets,
1927                                  bool *enabled, int width, int height)
1928 {
1929         struct drm_fb_helper_connector *fb_helper_conn;
1930         int i;
1931         uint64_t conn_configured = 0, mask;
1932         int tile_pass = 0;
1933         mask = (1 << fb_helper->connector_count) - 1;
1934 retry:
1935         for (i = 0; i < fb_helper->connector_count; i++) {
1936                 fb_helper_conn = fb_helper->connector_info[i];
1937
1938                 if (conn_configured & (1 << i))
1939                         continue;
1940
1941                 if (enabled[i] == false) {
1942                         conn_configured |= (1 << i);
1943                         continue;
1944                 }
1945
1946                 /* first pass over all the untiled connectors */
1947                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1948                         continue;
1949
1950                 if (tile_pass == 1) {
1951                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1952                             fb_helper_conn->connector->tile_v_loc != 0)
1953                                 continue;
1954
1955                 } else {
1956                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1957                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1958                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1959                                 continue;
1960
1961                         /* find the tile offsets for this pass - need
1962                            to find all tiles left and above */
1963                         drm_get_tile_offsets(fb_helper, modes, offsets,
1964                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1965                 }
1966                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1967                               fb_helper_conn->connector->base.id);
1968
1969                 /* got for command line mode first */
1970                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1971                 if (!modes[i]) {
1972                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1973                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1974                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1975                 }
1976                 /* No preferred modes, pick one off the list */
1977                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1978                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1979                                 break;
1980                 }
1981                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1982                           "none");
1983                 conn_configured |= (1 << i);
1984         }
1985
1986         if ((conn_configured & mask) != mask) {
1987                 tile_pass++;
1988                 goto retry;
1989         }
1990         return true;
1991 }
1992
1993 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1994                           struct drm_fb_helper_crtc **best_crtcs,
1995                           struct drm_display_mode **modes,
1996                           int n, int width, int height)
1997 {
1998         int c, o;
1999         struct drm_connector *connector;
2000         const struct drm_connector_helper_funcs *connector_funcs;
2001         struct drm_encoder *encoder;
2002         int my_score, best_score, score;
2003         struct drm_fb_helper_crtc **crtcs, *crtc;
2004         struct drm_fb_helper_connector *fb_helper_conn;
2005
2006         if (n == fb_helper->connector_count)
2007                 return 0;
2008
2009         fb_helper_conn = fb_helper->connector_info[n];
2010         connector = fb_helper_conn->connector;
2011
2012         best_crtcs[n] = NULL;
2013         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
2014         if (modes[n] == NULL)
2015                 return best_score;
2016
2017         crtcs = kzalloc(fb_helper->connector_count *
2018                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2019         if (!crtcs)
2020                 return best_score;
2021
2022         my_score = 1;
2023         if (connector->status == connector_status_connected)
2024                 my_score++;
2025         if (drm_has_cmdline_mode(fb_helper_conn))
2026                 my_score++;
2027         if (drm_has_preferred_mode(fb_helper_conn, width, height))
2028                 my_score++;
2029
2030         connector_funcs = connector->helper_private;
2031
2032         /*
2033          * If the DRM device implements atomic hooks and ->best_encoder() is
2034          * NULL we fallback to the default drm_atomic_helper_best_encoder()
2035          * helper.
2036          */
2037         if (fb_helper->dev->mode_config.funcs->atomic_commit &&
2038             !connector_funcs->best_encoder)
2039                 encoder = drm_atomic_helper_best_encoder(connector);
2040         else
2041                 encoder = connector_funcs->best_encoder(connector);
2042
2043         if (!encoder)
2044                 goto out;
2045
2046         /* select a crtc for this connector and then attempt to configure
2047            remaining connectors */
2048         for (c = 0; c < fb_helper->crtc_count; c++) {
2049                 crtc = &fb_helper->crtc_info[c];
2050
2051                 if ((encoder->possible_crtcs & (1 << c)) == 0)
2052                         continue;
2053
2054                 for (o = 0; o < n; o++)
2055                         if (best_crtcs[o] == crtc)
2056                                 break;
2057
2058                 if (o < n) {
2059                         /* ignore cloning unless only a single crtc */
2060                         if (fb_helper->crtc_count > 1)
2061                                 continue;
2062
2063                         if (!drm_mode_equal(modes[o], modes[n]))
2064                                 continue;
2065                 }
2066
2067                 crtcs[n] = crtc;
2068                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
2069                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
2070                                                   width, height);
2071                 if (score > best_score) {
2072                         best_score = score;
2073                         memcpy(best_crtcs, crtcs,
2074                                fb_helper->connector_count *
2075                                sizeof(struct drm_fb_helper_crtc *));
2076                 }
2077         }
2078 out:
2079         kfree(crtcs);
2080         return best_score;
2081 }
2082
2083 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
2084 {
2085         struct drm_device *dev = fb_helper->dev;
2086         struct drm_fb_helper_crtc **crtcs;
2087         struct drm_display_mode **modes;
2088         struct drm_fb_offset *offsets;
2089         struct drm_mode_set *modeset;
2090         bool *enabled;
2091         int width, height;
2092         int i;
2093
2094         DRM_DEBUG_KMS("\n");
2095
2096         width = dev->mode_config.max_width;
2097         height = dev->mode_config.max_height;
2098
2099         crtcs = kcalloc(fb_helper->connector_count,
2100                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2101         modes = kcalloc(fb_helper->connector_count,
2102                         sizeof(struct drm_display_mode *), GFP_KERNEL);
2103         offsets = kcalloc(fb_helper->connector_count,
2104                           sizeof(struct drm_fb_offset), GFP_KERNEL);
2105         enabled = kcalloc(fb_helper->connector_count,
2106                           sizeof(bool), GFP_KERNEL);
2107         if (!crtcs || !modes || !enabled || !offsets) {
2108                 DRM_ERROR("Memory allocation failed\n");
2109                 goto out;
2110         }
2111
2112
2113         drm_enable_connectors(fb_helper, enabled);
2114
2115         if (!(fb_helper->funcs->initial_config &&
2116               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
2117                                                offsets,
2118                                                enabled, width, height))) {
2119                 memset(modes, 0, fb_helper->connector_count*sizeof(modes[0]));
2120                 memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0]));
2121                 memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0]));
2122
2123                 if (!drm_target_cloned(fb_helper, modes, offsets,
2124                                        enabled, width, height) &&
2125                     !drm_target_preferred(fb_helper, modes, offsets,
2126                                           enabled, width, height))
2127                         DRM_ERROR("Unable to find initial modes\n");
2128
2129                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2130                               width, height);
2131
2132                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
2133         }
2134
2135         /* need to set the modesets up here for use later */
2136         /* fill out the connector<->crtc mappings into the modesets */
2137         for (i = 0; i < fb_helper->crtc_count; i++) {
2138                 modeset = &fb_helper->crtc_info[i].mode_set;
2139                 modeset->num_connectors = 0;
2140                 modeset->fb = NULL;
2141         }
2142
2143         for (i = 0; i < fb_helper->connector_count; i++) {
2144                 struct drm_display_mode *mode = modes[i];
2145                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
2146                 struct drm_fb_offset *offset = &offsets[i];
2147                 modeset = &fb_crtc->mode_set;
2148
2149                 if (mode && fb_crtc) {
2150                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2151                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
2152                         fb_crtc->desired_mode = mode;
2153                         fb_crtc->x = offset->x;
2154                         fb_crtc->y = offset->y;
2155                         if (modeset->mode)
2156                                 drm_mode_destroy(dev, modeset->mode);
2157                         modeset->mode = drm_mode_duplicate(dev,
2158                                                            fb_crtc->desired_mode);
2159                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
2160                         modeset->fb = fb_helper->fb;
2161                         modeset->x = offset->x;
2162                         modeset->y = offset->y;
2163                 }
2164         }
2165
2166         /* Clear out any old modes if there are no more connected outputs. */
2167         for (i = 0; i < fb_helper->crtc_count; i++) {
2168                 modeset = &fb_helper->crtc_info[i].mode_set;
2169                 if (modeset->num_connectors == 0) {
2170                         BUG_ON(modeset->fb);
2171                         if (modeset->mode)
2172                                 drm_mode_destroy(dev, modeset->mode);
2173                         modeset->mode = NULL;
2174                 }
2175         }
2176 out:
2177         kfree(crtcs);
2178         kfree(modes);
2179         kfree(offsets);
2180         kfree(enabled);
2181 }
2182
2183 /**
2184  * drm_fb_helper_initial_config - setup a sane initial connector configuration
2185  * @fb_helper: fb_helper device struct
2186  * @bpp_sel: bpp value to use for the framebuffer configuration
2187  *
2188  * Scans the CRTCs and connectors and tries to put together an initial setup.
2189  * At the moment, this is a cloned configuration across all heads with
2190  * a new framebuffer object as the backing store.
2191  *
2192  * Note that this also registers the fbdev and so allows userspace to call into
2193  * the driver through the fbdev interfaces.
2194  *
2195  * This function will call down into the ->fb_probe callback to let
2196  * the driver allocate and initialize the fbdev info structure and the drm
2197  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2198  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2199  * values for the fbdev info structure.
2200  *
2201  * HANG DEBUGGING:
2202  *
2203  * When you have fbcon support built-in or already loaded, this function will do
2204  * a full modeset to setup the fbdev console. Due to locking misdesign in the
2205  * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2206  * console_lock. Until console_unlock is called no dmesg lines will be sent out
2207  * to consoles, not even serial console. This means when your driver crashes,
2208  * you will see absolutely nothing else but a system stuck in this function,
2209  * with no further output. Any kind of printk() you place within your own driver
2210  * or in the drm core modeset code will also never show up.
2211  *
2212  * Standard debug practice is to run the fbcon setup without taking the
2213  * console_lock as a hack, to be able to see backtraces and crashes on the
2214  * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2215  * cmdline option.
2216  *
2217  * The other option is to just disable fbdev emulation since very likely the
2218  * first modeset from userspace will crash in the same way, and is even easier
2219  * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2220  * kernel cmdline option.
2221  *
2222  * RETURNS:
2223  * Zero if everything went ok, nonzero otherwise.
2224  */
2225 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
2226 {
2227         struct drm_device *dev = fb_helper->dev;
2228         int count = 0;
2229
2230         if (!drm_fbdev_emulation)
2231                 return 0;
2232
2233         mutex_lock(&dev->mode_config.mutex);
2234         count = drm_fb_helper_probe_connector_modes(fb_helper,
2235                                                     dev->mode_config.max_width,
2236                                                     dev->mode_config.max_height);
2237         mutex_unlock(&dev->mode_config.mutex);
2238         /*
2239          * we shouldn't end up with no modes here.
2240          */
2241         if (count == 0)
2242                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
2243
2244         drm_setup_crtcs(fb_helper);
2245
2246         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
2247 }
2248 EXPORT_SYMBOL(drm_fb_helper_initial_config);
2249
2250 /**
2251  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2252  *                               probing all the outputs attached to the fb
2253  * @fb_helper: the drm_fb_helper
2254  *
2255  * Scan the connectors attached to the fb_helper and try to put together a
2256  * setup after notification of a change in output configuration.
2257  *
2258  * Called at runtime, takes the mode config locks to be able to check/change the
2259  * modeset configuration. Must be run from process context (which usually means
2260  * either the output polling work or a work item launched from the driver's
2261  * hotplug interrupt).
2262  *
2263  * Note that drivers may call this even before calling
2264  * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2265  * for a race-free fbcon setup and will make sure that the fbdev emulation will
2266  * not miss any hotplug events.
2267  *
2268  * RETURNS:
2269  * 0 on success and a non-zero error code otherwise.
2270  */
2271 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2272 {
2273         struct drm_device *dev = fb_helper->dev;
2274         u32 max_width, max_height;
2275
2276         if (!drm_fbdev_emulation)
2277                 return 0;
2278
2279         mutex_lock(&fb_helper->dev->mode_config.mutex);
2280         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
2281                 fb_helper->delayed_hotplug = true;
2282                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
2283                 return 0;
2284         }
2285         DRM_DEBUG_KMS("\n");
2286
2287         max_width = fb_helper->fb->width;
2288         max_height = fb_helper->fb->height;
2289
2290         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
2291         mutex_unlock(&fb_helper->dev->mode_config.mutex);
2292
2293         drm_modeset_lock_all(dev);
2294         drm_setup_crtcs(fb_helper);
2295         drm_modeset_unlock_all(dev);
2296         drm_fb_helper_set_par(fb_helper->fbdev);
2297
2298         return 0;
2299 }
2300 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2301
2302 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2303  * but the module doesn't depend on any fb console symbols.  At least
2304  * attempt to load fbcon to avoid leaving the system without a usable console.
2305  */
2306 int __init drm_fb_helper_modinit(void)
2307 {
2308 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2309         const char *name = "fbcon";
2310         struct module *fbcon;
2311
2312         mutex_lock(&module_mutex);
2313         fbcon = find_module(name);
2314         mutex_unlock(&module_mutex);
2315
2316         if (!fbcon)
2317                 request_module_nowait(name);
2318 #endif
2319         return 0;
2320 }
2321 EXPORT_SYMBOL(drm_fb_helper_modinit);