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/kernel.h>
  33 #include <linux/sysrq.h>
  34 #include <linux/slab.h>
  35 #include <linux/fb.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, 0, 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 = BIT(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 (fb_helper->atomic)
 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                                                     BIT(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 (dev->primary->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_dirty_work(struct work_struct *work)
 622 {
 623         struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper,
 624                                                     dirty_work);
 625         struct drm_clip_rect *clip = &helper->dirty_clip;
 626         struct drm_clip_rect clip_copy;
 627         unsigned long flags;
 628
 629         spin_lock_irqsave(&helper->dirty_lock, flags);
 630         clip_copy = *clip;
 631         clip->x1 = clip->y1 = ~0;
 632         clip->x2 = clip->y2 = 0;
 633         spin_unlock_irqrestore(&helper->dirty_lock, flags);
 634
 635         helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1);
 636 }
 637
 638 /**
 639  * drm_fb_helper_prepare - setup a drm_fb_helper structure
 640  * @dev: DRM device
 641  * @helper: driver-allocated fbdev helper structure to set up
 642  * @funcs: pointer to structure of functions associate with this helper
 643  *
 644  * Sets up the bare minimum to make the framebuffer helper usable. This is
 645  * useful to implement race-free initialization of the polling helpers.
 646  */
 647 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 648                            const struct drm_fb_helper_funcs *funcs)
 649 {
 650         INIT_LIST_HEAD(&helper->kernel_fb_list);
 651         spin_lock_init(&helper->dirty_lock);
 652         INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work);
 653         helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0;
 654         helper->funcs = funcs;
 655         helper->dev = dev;
 656 }
 657 EXPORT_SYMBOL(drm_fb_helper_prepare);
 658
 659 /**
 660  * drm_fb_helper_init - initialize a drm_fb_helper structure
 661  * @dev: drm device
 662  * @fb_helper: driver-allocated fbdev helper structure to initialize
 663  * @crtc_count: maximum number of crtcs to support in this fbdev emulation
 664  * @max_conn_count: max connector count
 665  *
 666  * This allocates the structures for the fbdev helper with the given limits.
 667  * Note that this won't yet touch the hardware (through the driver interfaces)
 668  * nor register the fbdev. This is only done in drm_fb_helper_initial_config()
 669  * to allow driver writes more control over the exact init sequence.
 670  *
 671  * Drivers must call drm_fb_helper_prepare() before calling this function.
 672  *
 673  * RETURNS:
 674  * Zero if everything went ok, nonzero otherwise.
 675  */
 676 int drm_fb_helper_init(struct drm_device *dev,
 677                        struct drm_fb_helper *fb_helper,
 678                        int crtc_count, int max_conn_count)
 679 {
 680         struct drm_crtc *crtc;
 681         int i;
 682
 683         if (!drm_fbdev_emulation)
 684                 return 0;
 685
 686         if (!max_conn_count)
 687                 return -EINVAL;
 688
 689         fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
 690         if (!fb_helper->crtc_info)
 691                 return -ENOMEM;
 692
 693         fb_helper->crtc_count = crtc_count;
 694         fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
 695         if (!fb_helper->connector_info) {
 696                 kfree(fb_helper->crtc_info);
 697                 return -ENOMEM;
 698         }
 699         fb_helper->connector_info_alloc_count = dev->mode_config.num_connector;
 700         fb_helper->connector_count = 0;
 701
 702         for (i = 0; i < crtc_count; i++) {
 703                 fb_helper->crtc_info[i].mode_set.connectors =
 704                         kcalloc(max_conn_count,
 705                                 sizeof(struct drm_connector *),
 706                                 GFP_KERNEL);
 707
 708                 if (!fb_helper->crtc_info[i].mode_set.connectors)
 709                         goto out_free;
 710                 fb_helper->crtc_info[i].mode_set.num_connectors = 0;
 711         }
 712
 713         i = 0;
 714         drm_for_each_crtc(crtc, dev) {
 715                 fb_helper->crtc_info[i].mode_set.crtc = crtc;
 716                 i++;
 717         }
 718
 719         fb_helper->atomic = !!drm_core_check_feature(dev, DRIVER_ATOMIC);
 720
 721         return 0;
 722 out_free:
 723         drm_fb_helper_crtc_free(fb_helper);
 724         return -ENOMEM;
 725 }
 726 EXPORT_SYMBOL(drm_fb_helper_init);
 727
 728 /**
 729  * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members
 730  * @fb_helper: driver-allocated fbdev helper
 731  *
 732  * A helper to alloc fb_info and the members cmap and apertures. Called
 733  * by the driver within the fb_probe fb_helper callback function.
 734  *
 735  * RETURNS:
 736  * fb_info pointer if things went okay, pointer containing error code
 737  * otherwise
 738  */
 739 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 740 {
 741         struct device *dev = fb_helper->dev->dev;
 742         struct fb_info *info;
 743         int ret;
 744
 745         info = framebuffer_alloc(0, dev);
 746         if (!info)
 747                 return ERR_PTR(-ENOMEM);
 748
 749         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 750         if (ret)
 751                 goto err_release;
 752
 753         info->apertures = alloc_apertures(1);
 754         if (!info->apertures) {
 755                 ret = -ENOMEM;
 756                 goto err_free_cmap;
 757         }
 758
 759         fb_helper->fbdev = info;
 760
 761         return info;
 762
 763 err_free_cmap:
 764         fb_dealloc_cmap(&info->cmap);
 765 err_release:
 766         framebuffer_release(info);
 767         return ERR_PTR(ret);
 768 }
 769 EXPORT_SYMBOL(drm_fb_helper_alloc_fbi);
 770
 771 /**
 772  * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device
 773  * @fb_helper: driver-allocated fbdev helper
 774  *
 775  * A wrapper around unregister_framebuffer, to release the fb_info
 776  * framebuffer device
 777  */
 778 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 779 {
 780         if (fb_helper && fb_helper->fbdev)
 781                 unregister_framebuffer(fb_helper->fbdev);
 782 }
 783 EXPORT_SYMBOL(drm_fb_helper_unregister_fbi);
 784
 785 /**
 786  * drm_fb_helper_release_fbi - dealloc fb_info and its members
 787  * @fb_helper: driver-allocated fbdev helper
 788  *
 789  * A helper to free memory taken by fb_info and the members cmap and
 790  * apertures
 791  */
 792 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 793 {
 794         if (fb_helper) {
 795                 struct fb_info *info = fb_helper->fbdev;
 796
 797                 if (info) {
 798                         if (info->cmap.len)
 799                                 fb_dealloc_cmap(&info->cmap);
 800                         framebuffer_release(info);
 801                 }
 802
 803                 fb_helper->fbdev = NULL;
 804         }
 805 }
 806 EXPORT_SYMBOL(drm_fb_helper_release_fbi);
 807
 808 void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 809 {
 810         if (!drm_fbdev_emulation)
 811                 return;
 812
 813         if (!list_empty(&fb_helper->kernel_fb_list)) {
 814                 list_del(&fb_helper->kernel_fb_list);
 815                 if (list_empty(&kernel_fb_helper_list)) {
 816                         unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 817                 }
 818         }
 819
 820         drm_fb_helper_crtc_free(fb_helper);
 821
 822 }
 823 EXPORT_SYMBOL(drm_fb_helper_fini);
 824
 825 /**
 826  * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer
 827  * @fb_helper: driver-allocated fbdev helper
 828  *
 829  * A wrapper around unlink_framebuffer implemented by fbdev core
 830  */
 831 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 832 {
 833         if (fb_helper && fb_helper->fbdev)
 834                 unlink_framebuffer(fb_helper->fbdev);
 835 }
 836 EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
 837
 838 static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
 839                                 u32 width, u32 height)
 840 {
 841         struct drm_fb_helper *helper = info->par;
 842         struct drm_clip_rect *clip = &helper->dirty_clip;
 843         unsigned long flags;
 844
 845         if (!helper->fb->funcs->dirty)
 846                 return;
 847
 848         spin_lock_irqsave(&helper->dirty_lock, flags);
 849         clip->x1 = min_t(u32, clip->x1, x);
 850         clip->y1 = min_t(u32, clip->y1, y);
 851         clip->x2 = max_t(u32, clip->x2, x + width);
 852         clip->y2 = max_t(u32, clip->y2, y + height);
 853         spin_unlock_irqrestore(&helper->dirty_lock, flags);
 854
 855         schedule_work(&helper->dirty_work);
 856 }
 857
 858 /**
 859  * drm_fb_helper_deferred_io() - fbdev deferred_io callback function
 860  * @info: fb_info struct pointer
 861  * @pagelist: list of dirty mmap framebuffer pages
 862  *
 863  * This function is used as the &fb_deferred_io ->deferred_io
 864  * callback function for flushing the fbdev mmap writes.
 865  */
 866 void drm_fb_helper_deferred_io(struct fb_info *info,
 867                                struct list_head *pagelist)
 868 {
 869         unsigned long start, end, min, max;
 870         struct page *page;
 871         u32 y1, y2;
 872
 873         min = ULONG_MAX;
 874         max = 0;
 875         list_for_each_entry(page, pagelist, lru) {
 876                 start = page->index << PAGE_SHIFT;
 877                 end = start + PAGE_SIZE - 1;
 878                 min = min(min, start);
 879                 max = max(max, end);
 880         }
 881
 882         if (min < max) {
 883                 y1 = min / info->fix.line_length;
 884                 y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length),
 885                            info->var.yres);
 886                 drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1);
 887         }
 888 }
 889 EXPORT_SYMBOL(drm_fb_helper_deferred_io);
 890
 891 /**
 892  * drm_fb_helper_sys_read - wrapper around fb_sys_read
 893  * @info: fb_info struct pointer
 894  * @buf: userspace buffer to read from framebuffer memory
 895  * @count: number of bytes to read from framebuffer memory
 896  * @ppos: read offset within framebuffer memory
 897  *
 898  * A wrapper around fb_sys_read implemented by fbdev core
 899  */
 900 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 901                                size_t count, loff_t *ppos)
 902 {
 903         return fb_sys_read(info, buf, count, ppos);
 904 }
 905 EXPORT_SYMBOL(drm_fb_helper_sys_read);
 906
 907 /**
 908  * drm_fb_helper_sys_write - wrapper around fb_sys_write
 909  * @info: fb_info struct pointer
 910  * @buf: userspace buffer to write to framebuffer memory
 911  * @count: number of bytes to write to framebuffer memory
 912  * @ppos: write offset within framebuffer memory
 913  *
 914  * A wrapper around fb_sys_write implemented by fbdev core
 915  */
 916 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 917                                 size_t count, loff_t *ppos)
 918 {
 919         ssize_t ret;
 920
 921         ret = fb_sys_write(info, buf, count, ppos);
 922         if (ret > 0)
 923                 drm_fb_helper_dirty(info, 0, 0, info->var.xres,
 924                                     info->var.yres);
 925
 926         return ret;
 927 }
 928 EXPORT_SYMBOL(drm_fb_helper_sys_write);
 929
 930 /**
 931  * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
 932  * @info: fbdev registered by the helper
 933  * @rect: info about rectangle to fill
 934  *
 935  * A wrapper around sys_fillrect implemented by fbdev core
 936  */
 937 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 938                                 const struct fb_fillrect *rect)
 939 {
 940         sys_fillrect(info, rect);
 941         drm_fb_helper_dirty(info, rect->dx, rect->dy,
 942                             rect->width, rect->height);
 943 }
 944 EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
 945
 946 /**
 947  * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
 948  * @info: fbdev registered by the helper
 949  * @area: info about area to copy
 950  *
 951  * A wrapper around sys_copyarea implemented by fbdev core
 952  */
 953 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 954                                 const struct fb_copyarea *area)
 955 {
 956         sys_copyarea(info, area);
 957         drm_fb_helper_dirty(info, area->dx, area->dy,
 958                             area->width, area->height);
 959 }
 960 EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
 961
 962 /**
 963  * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
 964  * @info: fbdev registered by the helper
 965  * @image: info about image to blit
 966  *
 967  * A wrapper around sys_imageblit implemented by fbdev core
 968  */
 969 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 970                                  const struct fb_image *image)
 971 {
 972         sys_imageblit(info, image);
 973         drm_fb_helper_dirty(info, image->dx, image->dy,
 974                             image->width, image->height);
 975 }
 976 EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
 977
 978 /**
 979  * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect
 980  * @info: fbdev registered by the helper
 981  * @rect: info about rectangle to fill
 982  *
 983  * A wrapper around cfb_imageblit implemented by fbdev core
 984  */
 985 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 986                                 const struct fb_fillrect *rect)
 987 {
 988         cfb_fillrect(info, rect);
 989         drm_fb_helper_dirty(info, rect->dx, rect->dy,
 990                             rect->width, rect->height);
 991 }
 992 EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect);
 993
 994 /**
 995  * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea
 996  * @info: fbdev registered by the helper
 997  * @area: info about area to copy
 998  *
 999  * A wrapper around cfb_copyarea implemented by fbdev core
1000  */
1001 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
1002                                 const struct fb_copyarea *area)
1003 {
1004         cfb_copyarea(info, area);
1005         drm_fb_helper_dirty(info, area->dx, area->dy,
1006                             area->width, area->height);
1007 }
1008 EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea);
1009
1010 /**
1011  * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit
1012  * @info: fbdev registered by the helper
1013  * @image: info about image to blit
1014  *
1015  * A wrapper around cfb_imageblit implemented by fbdev core
1016  */
1017 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
1018                                  const struct fb_image *image)
1019 {
1020         cfb_imageblit(info, image);
1021         drm_fb_helper_dirty(info, image->dx, image->dy,
1022                             image->width, image->height);
1023 }
1024 EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit);
1025
1026 /**
1027  * drm_fb_helper_set_suspend - wrapper around fb_set_suspend
1028  * @fb_helper: driver-allocated fbdev helper
1029  * @state: desired state, zero to resume, non-zero to suspend
1030  *
1031  * A wrapper around fb_set_suspend implemented by fbdev core
1032  */
1033 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state)
1034 {
1035         if (fb_helper && fb_helper->fbdev)
1036                 fb_set_suspend(fb_helper->fbdev, state);
1037 }
1038 EXPORT_SYMBOL(drm_fb_helper_set_suspend);
1039
1040 static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
1041                      u16 blue, u16 regno, struct fb_info *info)
1042 {
1043         struct drm_fb_helper *fb_helper = info->par;
1044         struct drm_framebuffer *fb = fb_helper->fb;
1045         int pindex;
1046
1047         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
1048                 u32 *palette;
1049                 u32 value;
1050                 /* place color in psuedopalette */
1051                 if (regno > 16)
1052                         return -EINVAL;
1053                 palette = (u32 *)info->pseudo_palette;
1054                 red >>= (16 - info->var.red.length);
1055                 green >>= (16 - info->var.green.length);
1056                 blue >>= (16 - info->var.blue.length);
1057                 value = (red << info->var.red.offset) |
1058                         (green << info->var.green.offset) |
1059                         (blue << info->var.blue.offset);
1060                 if (info->var.transp.length > 0) {
1061                         u32 mask = (1 << info->var.transp.length) - 1;
1062                         mask <<= info->var.transp.offset;
1063                         value |= mask;
1064                 }
1065                 palette[regno] = value;
1066                 return 0;
1067         }
1068
1069         /*
1070          * The driver really shouldn't advertise pseudo/directcolor
1071          * visuals if it can't deal with the palette.
1072          */
1073         if (WARN_ON(!fb_helper->funcs->gamma_set ||
1074                     !fb_helper->funcs->gamma_get))
1075                 return -EINVAL;
1076
1077         pindex = regno;
1078
1079         if (fb->bits_per_pixel == 16) {
1080                 pindex = regno << 3;
1081
1082                 if (fb->depth == 16 && regno > 63)
1083                         return -EINVAL;
1084                 if (fb->depth == 15 && regno > 31)
1085                         return -EINVAL;
1086
1087                 if (fb->depth == 16) {
1088                         u16 r, g, b;
1089                         int i;
1090                         if (regno < 32) {
1091                                 for (i = 0; i < 8; i++)
1092                                         fb_helper->funcs->gamma_set(crtc, red,
1093                                                 green, blue, pindex + i);
1094                         }
1095
1096                         fb_helper->funcs->gamma_get(crtc, &r,
1097                                                     &g, &b,
1098                                                     pindex >> 1);
1099
1100                         for (i = 0; i < 4; i++)
1101                                 fb_helper->funcs->gamma_set(crtc, r,
1102                                                             green, b,
1103                                                             (pindex >> 1) + i);
1104                 }
1105         }
1106
1107         if (fb->depth != 16)
1108                 fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
1109         return 0;
1110 }
1111
1112 /**
1113  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
1114  * @cmap: cmap to set
1115  * @info: fbdev registered by the helper
1116  */
1117 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1118 {
1119         struct drm_fb_helper *fb_helper = info->par;
1120         struct drm_device *dev = fb_helper->dev;
1121         const struct drm_crtc_helper_funcs *crtc_funcs;
1122         u16 *red, *green, *blue, *transp;
1123         struct drm_crtc *crtc;
1124         int i, j, rc = 0;
1125         int start;
1126
1127         if (oops_in_progress)
1128                 return -EBUSY;
1129
1130         drm_modeset_lock_all(dev);
1131         if (!drm_fb_helper_is_bound(fb_helper)) {
1132                 drm_modeset_unlock_all(dev);
1133                 return -EBUSY;
1134         }
1135
1136         for (i = 0; i < fb_helper->crtc_count; i++) {
1137                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
1138                 crtc_funcs = crtc->helper_private;
1139
1140                 red = cmap->red;
1141                 green = cmap->green;
1142                 blue = cmap->blue;
1143                 transp = cmap->transp;
1144                 start = cmap->start;
1145
1146                 for (j = 0; j < cmap->len; j++) {
1147                         u16 hred, hgreen, hblue, htransp = 0xffff;
1148
1149                         hred = *red++;
1150                         hgreen = *green++;
1151                         hblue = *blue++;
1152
1153                         if (transp)
1154                                 htransp = *transp++;
1155
1156                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
1157                         if (rc)
1158                                 goto out;
1159                 }
1160                 if (crtc_funcs->load_lut)
1161                         crtc_funcs->load_lut(crtc);
1162         }
1163  out:
1164         drm_modeset_unlock_all(dev);
1165         return rc;
1166 }
1167 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1168
1169 /**
1170  * drm_fb_helper_check_var - implementation for ->fb_check_var
1171  * @var: screeninfo to check
1172  * @info: fbdev registered by the helper
1173  */
1174 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1175                             struct fb_info *info)
1176 {
1177         struct drm_fb_helper *fb_helper = info->par;
1178         struct drm_framebuffer *fb = fb_helper->fb;
1179         int depth;
1180
1181         if (var->pixclock != 0 || in_dbg_master())
1182                 return -EINVAL;
1183
1184         /* Need to resize the fb object !!! */
1185         if (var->bits_per_pixel > fb->bits_per_pixel ||
1186             var->xres > fb->width || var->yres > fb->height ||
1187             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1188                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1189                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1190                           var->xres, var->yres, var->bits_per_pixel,
1191                           var->xres_virtual, var->yres_virtual,
1192                           fb->width, fb->height, fb->bits_per_pixel);
1193                 return -EINVAL;
1194         }
1195
1196         switch (var->bits_per_pixel) {
1197         case 16:
1198                 depth = (var->green.length == 6) ? 16 : 15;
1199                 break;
1200         case 32:
1201                 depth = (var->transp.length > 0) ? 32 : 24;
1202                 break;
1203         default:
1204                 depth = var->bits_per_pixel;
1205                 break;
1206         }
1207
1208         switch (depth) {
1209         case 8:
1210                 var->red.offset = 0;
1211                 var->green.offset = 0;
1212                 var->blue.offset = 0;
1213                 var->red.length = 8;
1214                 var->green.length = 8;
1215                 var->blue.length = 8;
1216                 var->transp.length = 0;
1217                 var->transp.offset = 0;
1218                 break;
1219         case 15:
1220                 var->red.offset = 10;
1221                 var->green.offset = 5;
1222                 var->blue.offset = 0;
1223                 var->red.length = 5;
1224                 var->green.length = 5;
1225                 var->blue.length = 5;
1226                 var->transp.length = 1;
1227                 var->transp.offset = 15;
1228                 break;
1229         case 16:
1230                 var->red.offset = 11;
1231                 var->green.offset = 5;
1232                 var->blue.offset = 0;
1233                 var->red.length = 5;
1234                 var->green.length = 6;
1235                 var->blue.length = 5;
1236                 var->transp.length = 0;
1237                 var->transp.offset = 0;
1238                 break;
1239         case 24:
1240                 var->red.offset = 16;
1241                 var->green.offset = 8;
1242                 var->blue.offset = 0;
1243                 var->red.length = 8;
1244                 var->green.length = 8;
1245                 var->blue.length = 8;
1246                 var->transp.length = 0;
1247                 var->transp.offset = 0;
1248                 break;
1249         case 32:
1250                 var->red.offset = 16;
1251                 var->green.offset = 8;
1252                 var->blue.offset = 0;
1253                 var->red.length = 8;
1254                 var->green.length = 8;
1255                 var->blue.length = 8;
1256                 var->transp.length = 8;
1257                 var->transp.offset = 24;
1258                 break;
1259         default:
1260                 return -EINVAL;
1261         }
1262         return 0;
1263 }
1264 EXPORT_SYMBOL(drm_fb_helper_check_var);
1265
1266 /**
1267  * drm_fb_helper_set_par - implementation for ->fb_set_par
1268  * @info: fbdev registered by the helper
1269  *
1270  * This will let fbcon do the mode init and is called at initialization time by
1271  * the fbdev core when registering the driver, and later on through the hotplug
1272  * callback.
1273  */
1274 int drm_fb_helper_set_par(struct fb_info *info)
1275 {
1276         struct drm_fb_helper *fb_helper = info->par;
1277         struct fb_var_screeninfo *var = &info->var;
1278
1279         if (oops_in_progress)
1280                 return -EBUSY;
1281
1282         if (var->pixclock != 0) {
1283                 DRM_ERROR("PIXEL CLOCK SET\n");
1284                 return -EINVAL;
1285         }
1286
1287         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1288
1289         return 0;
1290 }
1291 EXPORT_SYMBOL(drm_fb_helper_set_par);
1292
1293 static int pan_display_atomic(struct fb_var_screeninfo *var,
1294                               struct fb_info *info)
1295 {
1296         struct drm_fb_helper *fb_helper = info->par;
1297         struct drm_device *dev = fb_helper->dev;
1298         struct drm_atomic_state *state;
1299         struct drm_plane *plane;
1300         int i, ret;
1301         unsigned plane_mask;
1302
1303         state = drm_atomic_state_alloc(dev);
1304         if (!state)
1305                 return -ENOMEM;
1306
1307         state->acquire_ctx = dev->mode_config.acquire_ctx;
1308 retry:
1309         plane_mask = 0;
1310         for(i = 0; i < fb_helper->crtc_count; i++) {
1311                 struct drm_mode_set *mode_set;
1312
1313                 mode_set = &fb_helper->crtc_info[i].mode_set;
1314
1315                 mode_set->x = var->xoffset;
1316                 mode_set->y = var->yoffset;
1317
1318                 ret = __drm_atomic_helper_set_config(mode_set, state);
1319                 if (ret != 0)
1320                         goto fail;
1321
1322                 plane = mode_set->crtc->primary;
1323                 plane_mask |= (1 << drm_plane_index(plane));
1324                 plane->old_fb = plane->fb;
1325         }
1326
1327         ret = drm_atomic_commit(state);
1328         if (ret != 0)
1329                 goto fail;
1330
1331         info->var.xoffset = var->xoffset;
1332         info->var.yoffset = var->yoffset;
1333
1334
1335 fail:
1336         drm_atomic_clean_old_fb(dev, plane_mask, ret);
1337
1338         if (ret == -EDEADLK)
1339                 goto backoff;
1340
1341         if (ret != 0)
1342                 drm_atomic_state_free(state);
1343
1344         return ret;
1345
1346 backoff:
1347         drm_atomic_state_clear(state);
1348         drm_atomic_legacy_backoff(state);
1349
1350         goto retry;
1351 }
1352
1353 /**
1354  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1355  * @var: updated screen information
1356  * @info: fbdev registered by the helper
1357  */
1358 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1359                               struct fb_info *info)
1360 {
1361         struct drm_fb_helper *fb_helper = info->par;
1362         struct drm_device *dev = fb_helper->dev;
1363         struct drm_mode_set *modeset;
1364         int ret = 0;
1365         int i;
1366
1367         if (oops_in_progress)
1368                 return -EBUSY;
1369
1370         drm_modeset_lock_all(dev);
1371         if (!drm_fb_helper_is_bound(fb_helper)) {
1372                 drm_modeset_unlock_all(dev);
1373                 return -EBUSY;
1374         }
1375
1376         if (fb_helper->atomic) {
1377                 ret = pan_display_atomic(var, info);
1378                 goto unlock;
1379         }
1380
1381         for (i = 0; i < fb_helper->crtc_count; i++) {
1382                 modeset = &fb_helper->crtc_info[i].mode_set;
1383
1384                 modeset->x = var->xoffset;
1385                 modeset->y = var->yoffset;
1386
1387                 if (modeset->num_connectors) {
1388                         ret = drm_mode_set_config_internal(modeset);
1389                         if (!ret) {
1390                                 info->var.xoffset = var->xoffset;
1391                                 info->var.yoffset = var->yoffset;
1392                         }
1393                 }
1394         }
1395 unlock:
1396         drm_modeset_unlock_all(dev);
1397         return ret;
1398 }
1399 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1400
1401 /*
1402  * Allocates the backing storage and sets up the fbdev info structure through
1403  * the ->fb_probe callback and then registers the fbdev and sets up the panic
1404  * notifier.
1405  */
1406 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1407                                          int preferred_bpp)
1408 {
1409         int ret = 0;
1410         int crtc_count = 0;
1411         int i;
1412         struct fb_info *info;
1413         struct drm_fb_helper_surface_size sizes;
1414         int gamma_size = 0;
1415
1416         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1417         sizes.surface_depth = 24;
1418         sizes.surface_bpp = 32;
1419         sizes.fb_width = (unsigned)-1;
1420         sizes.fb_height = (unsigned)-1;
1421
1422         /* if driver picks 8 or 16 by default use that
1423            for both depth/bpp */
1424         if (preferred_bpp != sizes.surface_bpp)
1425                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1426
1427         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1428         for (i = 0; i < fb_helper->connector_count; i++) {
1429                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1430                 struct drm_cmdline_mode *cmdline_mode;
1431
1432                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1433
1434                 if (cmdline_mode->bpp_specified) {
1435                         switch (cmdline_mode->bpp) {
1436                         case 8:
1437                                 sizes.surface_depth = sizes.surface_bpp = 8;
1438                                 break;
1439                         case 15:
1440                                 sizes.surface_depth = 15;
1441                                 sizes.surface_bpp = 16;
1442                                 break;
1443                         case 16:
1444                                 sizes.surface_depth = sizes.surface_bpp = 16;
1445                                 break;
1446                         case 24:
1447                                 sizes.surface_depth = sizes.surface_bpp = 24;
1448                                 break;
1449                         case 32:
1450                                 sizes.surface_depth = 24;
1451                                 sizes.surface_bpp = 32;
1452                                 break;
1453                         }
1454                         break;
1455                 }
1456         }
1457
1458         crtc_count = 0;
1459         for (i = 0; i < fb_helper->crtc_count; i++) {
1460                 struct drm_display_mode *desired_mode;
1461                 struct drm_mode_set *mode_set;
1462                 int x, y, j;
1463                 /* in case of tile group, are we the last tile vert or horiz?
1464                  * If no tile group you are always the last one both vertically
1465                  * and horizontally
1466                  */
1467                 bool lastv = true, lasth = true;
1468
1469                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1470                 mode_set = &fb_helper->crtc_info[i].mode_set;
1471
1472                 if (!desired_mode)
1473                         continue;
1474
1475                 crtc_count++;
1476
1477                 x = fb_helper->crtc_info[i].x;
1478                 y = fb_helper->crtc_info[i].y;
1479
1480                 if (gamma_size == 0)
1481                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1482
1483                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1484                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1485
1486                 for (j = 0; j < mode_set->num_connectors; j++) {
1487                         struct drm_connector *connector = mode_set->connectors[j];
1488                         if (connector->has_tile) {
1489                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1490                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1491                                 /* cloning to multiple tiles is just crazy-talk, so: */
1492                                 break;
1493                         }
1494                 }
1495
1496                 if (lasth)
1497                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1498                 if (lastv)
1499                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1500         }
1501
1502         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1503                 /* hmm everyone went away - assume VGA cable just fell out
1504                    and will come back later. */
1505                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1506                 sizes.fb_width = sizes.surface_width = 1024;
1507                 sizes.fb_height = sizes.surface_height = 768;
1508         }
1509
1510         /* push down into drivers */
1511         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1512         if (ret < 0)
1513                 return ret;
1514
1515         info = fb_helper->fbdev;
1516
1517         /*
1518          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1519          * events, but at init time drm_setup_crtcs needs to be called before
1520          * the fb is allocated (since we need to figure out the desired size of
1521          * the fb before we can allocate it ...). Hence we need to fix things up
1522          * here again.
1523          */
1524         for (i = 0; i < fb_helper->crtc_count; i++)
1525                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1526                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1527
1528
1529         info->var.pixclock = 0;
1530         if (register_framebuffer(info) < 0)
1531                 return -EINVAL;
1532
1533         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1534                         info->node, info->fix.id);
1535
1536         if (list_empty(&kernel_fb_helper_list)) {
1537                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1538         }
1539
1540         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1541
1542         return 0;
1543 }
1544
1545 /**
1546  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1547  * @info: fbdev registered by the helper
1548  * @pitch: desired pitch
1549  * @depth: desired depth
1550  *
1551  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1552  * fbdev emulations. Drivers which support acceleration methods which impose
1553  * additional constraints need to set up their own limits.
1554  *
1555  * Drivers should call this (or their equivalent setup code) from their
1556  * ->fb_probe callback.
1557  */
1558 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1559                             uint32_t depth)
1560 {
1561         info->fix.type = FB_TYPE_PACKED_PIXELS;
1562         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1563                 FB_VISUAL_TRUECOLOR;
1564         info->fix.mmio_start = 0;
1565         info->fix.mmio_len = 0;
1566         info->fix.type_aux = 0;
1567         info->fix.xpanstep = 1; /* doing it in hw */
1568         info->fix.ypanstep = 1; /* doing it in hw */
1569         info->fix.ywrapstep = 0;
1570         info->fix.accel = FB_ACCEL_NONE;
1571
1572         info->fix.line_length = pitch;
1573         return;
1574 }
1575 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1576
1577 /**
1578  * drm_fb_helper_fill_var - initalizes variable fbdev information
1579  * @info: fbdev instance to set up
1580  * @fb_helper: fb helper instance to use as template
1581  * @fb_width: desired fb width
1582  * @fb_height: desired fb height
1583  *
1584  * Sets up the variable fbdev metainformation from the given fb helper instance
1585  * and the drm framebuffer allocated in fb_helper->fb.
1586  *
1587  * Drivers should call this (or their equivalent setup code) from their
1588  * ->fb_probe callback after having allocated the fbdev backing
1589  * storage framebuffer.
1590  */
1591 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1592                             uint32_t fb_width, uint32_t fb_height)
1593 {
1594         struct drm_framebuffer *fb = fb_helper->fb;
1595         info->pseudo_palette = fb_helper->pseudo_palette;
1596         info->var.xres_virtual = fb->width;
1597         info->var.yres_virtual = fb->height;
1598         info->var.bits_per_pixel = fb->bits_per_pixel;
1599         info->var.accel_flags = FB_ACCELF_TEXT;
1600         info->var.xoffset = 0;
1601         info->var.yoffset = 0;
1602         info->var.activate = FB_ACTIVATE_NOW;
1603         info->var.height = -1;
1604         info->var.width = -1;
1605
1606         switch (fb->depth) {
1607         case 8:
1608                 info->var.red.offset = 0;
1609                 info->var.green.offset = 0;
1610                 info->var.blue.offset = 0;
1611                 info->var.red.length = 8; /* 8bit DAC */
1612                 info->var.green.length = 8;
1613                 info->var.blue.length = 8;
1614                 info->var.transp.offset = 0;
1615                 info->var.transp.length = 0;
1616                 break;
1617         case 15:
1618                 info->var.red.offset = 10;
1619                 info->var.green.offset = 5;
1620                 info->var.blue.offset = 0;
1621                 info->var.red.length = 5;
1622                 info->var.green.length = 5;
1623                 info->var.blue.length = 5;
1624                 info->var.transp.offset = 15;
1625                 info->var.transp.length = 1;
1626                 break;
1627         case 16:
1628                 info->var.red.offset = 11;
1629                 info->var.green.offset = 5;
1630                 info->var.blue.offset = 0;
1631                 info->var.red.length = 5;
1632                 info->var.green.length = 6;
1633                 info->var.blue.length = 5;
1634                 info->var.transp.offset = 0;
1635                 break;
1636         case 24:
1637                 info->var.red.offset = 16;
1638                 info->var.green.offset = 8;
1639                 info->var.blue.offset = 0;
1640                 info->var.red.length = 8;
1641                 info->var.green.length = 8;
1642                 info->var.blue.length = 8;
1643                 info->var.transp.offset = 0;
1644                 info->var.transp.length = 0;
1645                 break;
1646         case 32:
1647                 info->var.red.offset = 16;
1648                 info->var.green.offset = 8;
1649                 info->var.blue.offset = 0;
1650                 info->var.red.length = 8;
1651                 info->var.green.length = 8;
1652                 info->var.blue.length = 8;
1653                 info->var.transp.offset = 24;
1654                 info->var.transp.length = 8;
1655                 break;
1656         default:
1657                 break;
1658         }
1659
1660         info->var.xres = fb_width;
1661         info->var.yres = fb_height;
1662 }
1663 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1664
1665 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1666                                                uint32_t maxX,
1667                                                uint32_t maxY)
1668 {
1669         struct drm_connector *connector;
1670         int count = 0;
1671         int i;
1672
1673         for (i = 0; i < fb_helper->connector_count; i++) {
1674                 connector = fb_helper->connector_info[i]->connector;
1675                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1676         }
1677
1678         return count;
1679 }
1680
1681 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1682 {
1683         struct drm_display_mode *mode;
1684
1685         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1686                 if (mode->hdisplay > width ||
1687                     mode->vdisplay > height)
1688                         continue;
1689                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1690                         return mode;
1691         }
1692         return NULL;
1693 }
1694 EXPORT_SYMBOL(drm_has_preferred_mode);
1695
1696 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1697 {
1698         return fb_connector->connector->cmdline_mode.specified;
1699 }
1700
1701 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1702                                                       int width, int height)
1703 {
1704         struct drm_cmdline_mode *cmdline_mode;
1705         struct drm_display_mode *mode;
1706         bool prefer_non_interlace;
1707
1708         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1709         if (cmdline_mode->specified == false)
1710                 return NULL;
1711
1712         /* attempt to find a matching mode in the list of modes
1713          *  we have gotten so far, if not add a CVT mode that conforms
1714          */
1715         if (cmdline_mode->rb || cmdline_mode->margins)
1716                 goto create_mode;
1717
1718         prefer_non_interlace = !cmdline_mode->interlace;
1719 again:
1720         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1721                 /* check width/height */
1722                 if (mode->hdisplay != cmdline_mode->xres ||
1723                     mode->vdisplay != cmdline_mode->yres)
1724                         continue;
1725
1726                 if (cmdline_mode->refresh_specified) {
1727                         if (mode->vrefresh != cmdline_mode->refresh)
1728                                 continue;
1729                 }
1730
1731                 if (cmdline_mode->interlace) {
1732                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1733                                 continue;
1734                 } else if (prefer_non_interlace) {
1735                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1736                                 continue;
1737                 }
1738                 return mode;
1739         }
1740
1741         if (prefer_non_interlace) {
1742                 prefer_non_interlace = false;
1743                 goto again;
1744         }
1745
1746 create_mode:
1747         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1748                                                  cmdline_mode);
1749         list_add(&mode->head, &fb_helper_conn->connector->modes);
1750         return mode;
1751 }
1752 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1753
1754 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1755 {
1756         bool enable;
1757
1758         if (strict)
1759                 enable = connector->status == connector_status_connected;
1760         else
1761                 enable = connector->status != connector_status_disconnected;
1762
1763         return enable;
1764 }
1765
1766 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1767                                   bool *enabled)
1768 {
1769         bool any_enabled = false;
1770         struct drm_connector *connector;
1771         int i = 0;
1772
1773         for (i = 0; i < fb_helper->connector_count; i++) {
1774                 connector = fb_helper->connector_info[i]->connector;
1775                 enabled[i] = drm_connector_enabled(connector, true);
1776                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1777                           enabled[i] ? "yes" : "no");
1778                 any_enabled |= enabled[i];
1779         }
1780
1781         if (any_enabled)
1782                 return;
1783
1784         for (i = 0; i < fb_helper->connector_count; i++) {
1785                 connector = fb_helper->connector_info[i]->connector;
1786                 enabled[i] = drm_connector_enabled(connector, false);
1787         }
1788 }
1789
1790 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1791                               struct drm_display_mode **modes,
1792                               struct drm_fb_offset *offsets,
1793                               bool *enabled, int width, int height)
1794 {
1795         int count, i, j;
1796         bool can_clone = false;
1797         struct drm_fb_helper_connector *fb_helper_conn;
1798         struct drm_display_mode *dmt_mode, *mode;
1799
1800         /* only contemplate cloning in the single crtc case */
1801         if (fb_helper->crtc_count > 1)
1802                 return false;
1803
1804         count = 0;
1805         for (i = 0; i < fb_helper->connector_count; i++) {
1806                 if (enabled[i])
1807                         count++;
1808         }
1809
1810         /* only contemplate cloning if more than one connector is enabled */
1811         if (count <= 1)
1812                 return false;
1813
1814         /* check the command line or if nothing common pick 1024x768 */
1815         can_clone = true;
1816         for (i = 0; i < fb_helper->connector_count; i++) {
1817                 if (!enabled[i])
1818                         continue;
1819                 fb_helper_conn = fb_helper->connector_info[i];
1820                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1821                 if (!modes[i]) {
1822                         can_clone = false;
1823                         break;
1824                 }
1825                 for (j = 0; j < i; j++) {
1826                         if (!enabled[j])
1827                                 continue;
1828                         if (!drm_mode_equal(modes[j], modes[i]))
1829                                 can_clone = false;
1830                 }
1831         }
1832
1833         if (can_clone) {
1834                 DRM_DEBUG_KMS("can clone using command line\n");
1835                 return true;
1836         }
1837
1838         /* try and find a 1024x768 mode on each connector */
1839         can_clone = true;
1840         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1841
1842         for (i = 0; i < fb_helper->connector_count; i++) {
1843
1844                 if (!enabled[i])
1845                         continue;
1846
1847                 fb_helper_conn = fb_helper->connector_info[i];
1848                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1849                         if (drm_mode_equal(mode, dmt_mode))
1850                                 modes[i] = mode;
1851                 }
1852                 if (!modes[i])
1853                         can_clone = false;
1854         }
1855
1856         if (can_clone) {
1857                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1858                 return true;
1859         }
1860         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1861         return false;
1862 }
1863
1864 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1865                                 struct drm_display_mode **modes,
1866                                 struct drm_fb_offset *offsets,
1867                                 int idx,
1868                                 int h_idx, int v_idx)
1869 {
1870         struct drm_fb_helper_connector *fb_helper_conn;
1871         int i;
1872         int hoffset = 0, voffset = 0;
1873
1874         for (i = 0; i < fb_helper->connector_count; i++) {
1875                 fb_helper_conn = fb_helper->connector_info[i];
1876                 if (!fb_helper_conn->connector->has_tile)
1877                         continue;
1878
1879                 if (!modes[i] && (h_idx || v_idx)) {
1880                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1881                                       fb_helper_conn->connector->base.id);
1882                         continue;
1883                 }
1884                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1885                         hoffset += modes[i]->hdisplay;
1886
1887                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1888                         voffset += modes[i]->vdisplay;
1889         }
1890         offsets[idx].x = hoffset;
1891         offsets[idx].y = voffset;
1892         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1893         return 0;
1894 }
1895
1896 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1897                                  struct drm_display_mode **modes,
1898                                  struct drm_fb_offset *offsets,
1899                                  bool *enabled, int width, int height)
1900 {
1901         struct drm_fb_helper_connector *fb_helper_conn;
1902         int i;
1903         uint64_t conn_configured = 0, mask;
1904         int tile_pass = 0;
1905         mask = (1 << fb_helper->connector_count) - 1;
1906 retry:
1907         for (i = 0; i < fb_helper->connector_count; i++) {
1908                 fb_helper_conn = fb_helper->connector_info[i];
1909
1910                 if (conn_configured & (1 << i))
1911                         continue;
1912
1913                 if (enabled[i] == false) {
1914                         conn_configured |= (1 << i);
1915                         continue;
1916                 }
1917
1918                 /* first pass over all the untiled connectors */
1919                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1920                         continue;
1921
1922                 if (tile_pass == 1) {
1923                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1924                             fb_helper_conn->connector->tile_v_loc != 0)
1925                                 continue;
1926
1927                 } else {
1928                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1929                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1930                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1931                                 continue;
1932
1933                         /* find the tile offsets for this pass - need
1934                            to find all tiles left and above */
1935                         drm_get_tile_offsets(fb_helper, modes, offsets,
1936                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1937                 }
1938                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1939                               fb_helper_conn->connector->base.id);
1940
1941                 /* got for command line mode first */
1942                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1943                 if (!modes[i]) {
1944                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1945                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1946                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1947                 }
1948                 /* No preferred modes, pick one off the list */
1949                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1950                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1951                                 break;
1952                 }
1953                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1954                           "none");
1955                 conn_configured |= (1 << i);
1956         }
1957
1958         if ((conn_configured & mask) != mask) {
1959                 tile_pass++;
1960                 goto retry;
1961         }
1962         return true;
1963 }
1964
1965 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1966                           struct drm_fb_helper_crtc **best_crtcs,
1967                           struct drm_display_mode **modes,
1968                           int n, int width, int height)
1969 {
1970         int c, o;
1971         struct drm_connector *connector;
1972         const struct drm_connector_helper_funcs *connector_funcs;
1973         struct drm_encoder *encoder;
1974         int my_score, best_score, score;
1975         struct drm_fb_helper_crtc **crtcs, *crtc;
1976         struct drm_fb_helper_connector *fb_helper_conn;
1977
1978         if (n == fb_helper->connector_count)
1979                 return 0;
1980
1981         fb_helper_conn = fb_helper->connector_info[n];
1982         connector = fb_helper_conn->connector;
1983
1984         best_crtcs[n] = NULL;
1985         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1986         if (modes[n] == NULL)
1987                 return best_score;
1988
1989         crtcs = kzalloc(fb_helper->connector_count *
1990                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1991         if (!crtcs)
1992                 return best_score;
1993
1994         my_score = 1;
1995         if (connector->status == connector_status_connected)
1996                 my_score++;
1997         if (drm_has_cmdline_mode(fb_helper_conn))
1998                 my_score++;
1999         if (drm_has_preferred_mode(fb_helper_conn, width, height))
2000                 my_score++;
2001
2002         connector_funcs = connector->helper_private;
2003         encoder = connector_funcs->best_encoder(connector);
2004         if (!encoder)
2005                 goto out;
2006
2007         /* select a crtc for this connector and then attempt to configure
2008            remaining connectors */
2009         for (c = 0; c < fb_helper->crtc_count; c++) {
2010                 crtc = &fb_helper->crtc_info[c];
2011
2012                 if ((encoder->possible_crtcs & (1 << c)) == 0)
2013                         continue;
2014
2015                 for (o = 0; o < n; o++)
2016                         if (best_crtcs[o] == crtc)
2017                                 break;
2018
2019                 if (o < n) {
2020                         /* ignore cloning unless only a single crtc */
2021                         if (fb_helper->crtc_count > 1)
2022                                 continue;
2023
2024                         if (!drm_mode_equal(modes[o], modes[n]))
2025                                 continue;
2026                 }
2027
2028                 crtcs[n] = crtc;
2029                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
2030                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
2031                                                   width, height);
2032                 if (score > best_score) {
2033                         best_score = score;
2034                         memcpy(best_crtcs, crtcs,
2035                                fb_helper->connector_count *
2036                                sizeof(struct drm_fb_helper_crtc *));
2037                 }
2038         }
2039 out:
2040         kfree(crtcs);
2041         return best_score;
2042 }
2043
2044 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
2045 {
2046         struct drm_device *dev = fb_helper->dev;
2047         struct drm_fb_helper_crtc **crtcs;
2048         struct drm_display_mode **modes;
2049         struct drm_fb_offset *offsets;
2050         struct drm_mode_set *modeset;
2051         bool *enabled;
2052         int width, height;
2053         int i;
2054
2055         DRM_DEBUG_KMS("\n");
2056
2057         width = dev->mode_config.max_width;
2058         height = dev->mode_config.max_height;
2059
2060         crtcs = kcalloc(fb_helper->connector_count,
2061                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2062         modes = kcalloc(fb_helper->connector_count,
2063                         sizeof(struct drm_display_mode *), GFP_KERNEL);
2064         offsets = kcalloc(fb_helper->connector_count,
2065                           sizeof(struct drm_fb_offset), GFP_KERNEL);
2066         enabled = kcalloc(fb_helper->connector_count,
2067                           sizeof(bool), GFP_KERNEL);
2068         if (!crtcs || !modes || !enabled || !offsets) {
2069                 DRM_ERROR("Memory allocation failed\n");
2070                 goto out;
2071         }
2072
2073
2074         drm_enable_connectors(fb_helper, enabled);
2075
2076         if (!(fb_helper->funcs->initial_config &&
2077               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
2078                                                offsets,
2079                                                enabled, width, height))) {
2080                 memset(modes, 0, fb_helper->connector_count*sizeof(modes[0]));
2081                 memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0]));
2082                 memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0]));
2083
2084                 if (!drm_target_cloned(fb_helper, modes, offsets,
2085                                        enabled, width, height) &&
2086                     !drm_target_preferred(fb_helper, modes, offsets,
2087                                           enabled, width, height))
2088                         DRM_ERROR("Unable to find initial modes\n");
2089
2090                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2091                               width, height);
2092
2093                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
2094         }
2095
2096         /* need to set the modesets up here for use later */
2097         /* fill out the connector<->crtc mappings into the modesets */
2098         for (i = 0; i < fb_helper->crtc_count; i++) {
2099                 modeset = &fb_helper->crtc_info[i].mode_set;
2100                 modeset->num_connectors = 0;
2101                 modeset->fb = NULL;
2102         }
2103
2104         for (i = 0; i < fb_helper->connector_count; i++) {
2105                 struct drm_display_mode *mode = modes[i];
2106                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
2107                 struct drm_fb_offset *offset = &offsets[i];
2108                 modeset = &fb_crtc->mode_set;
2109
2110                 if (mode && fb_crtc) {
2111                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2112                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
2113                         fb_crtc->desired_mode = mode;
2114                         fb_crtc->x = offset->x;
2115                         fb_crtc->y = offset->y;
2116                         if (modeset->mode)
2117                                 drm_mode_destroy(dev, modeset->mode);
2118                         modeset->mode = drm_mode_duplicate(dev,
2119                                                            fb_crtc->desired_mode);
2120                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
2121                         modeset->fb = fb_helper->fb;
2122                         modeset->x = offset->x;
2123                         modeset->y = offset->y;
2124                 }
2125         }
2126
2127         /* Clear out any old modes if there are no more connected outputs. */
2128         for (i = 0; i < fb_helper->crtc_count; i++) {
2129                 modeset = &fb_helper->crtc_info[i].mode_set;
2130                 if (modeset->num_connectors == 0) {
2131                         BUG_ON(modeset->fb);
2132                         if (modeset->mode)
2133                                 drm_mode_destroy(dev, modeset->mode);
2134                         modeset->mode = NULL;
2135                 }
2136         }
2137 out:
2138         kfree(crtcs);
2139         kfree(modes);
2140         kfree(offsets);
2141         kfree(enabled);
2142 }
2143
2144 /**
2145  * drm_fb_helper_initial_config - setup a sane initial connector configuration
2146  * @fb_helper: fb_helper device struct
2147  * @bpp_sel: bpp value to use for the framebuffer configuration
2148  *
2149  * Scans the CRTCs and connectors and tries to put together an initial setup.
2150  * At the moment, this is a cloned configuration across all heads with
2151  * a new framebuffer object as the backing store.
2152  *
2153  * Note that this also registers the fbdev and so allows userspace to call into
2154  * the driver through the fbdev interfaces.
2155  *
2156  * This function will call down into the ->fb_probe callback to let
2157  * the driver allocate and initialize the fbdev info structure and the drm
2158  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2159  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2160  * values for the fbdev info structure.
2161  *
2162  * HANG DEBUGGING:
2163  *
2164  * When you have fbcon support built-in or already loaded, this function will do
2165  * a full modeset to setup the fbdev console. Due to locking misdesign in the
2166  * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2167  * console_lock. Until console_unlock is called no dmesg lines will be sent out
2168  * to consoles, not even serial console. This means when your driver crashes,
2169  * you will see absolutely nothing else but a system stuck in this function,
2170  * with no further output. Any kind of printk() you place within your own driver
2171  * or in the drm core modeset code will also never show up.
2172  *
2173  * Standard debug practice is to run the fbcon setup without taking the
2174  * console_lock as a hack, to be able to see backtraces and crashes on the
2175  * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2176  * cmdline option.
2177  *
2178  * The other option is to just disable fbdev emulation since very likely the
2179  * first modeset from userspace will crash in the same way, and is even easier
2180  * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2181  * kernel cmdline option.
2182  *
2183  * RETURNS:
2184  * Zero if everything went ok, nonzero otherwise.
2185  */
2186 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
2187 {
2188         struct drm_device *dev = fb_helper->dev;
2189         int count = 0;
2190
2191         if (!drm_fbdev_emulation)
2192                 return 0;
2193
2194         mutex_lock(&dev->mode_config.mutex);
2195         count = drm_fb_helper_probe_connector_modes(fb_helper,
2196                                                     dev->mode_config.max_width,
2197                                                     dev->mode_config.max_height);
2198         mutex_unlock(&dev->mode_config.mutex);
2199         /*
2200          * we shouldn't end up with no modes here.
2201          */
2202         if (count == 0)
2203                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
2204
2205         drm_setup_crtcs(fb_helper);
2206
2207         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
2208 }
2209 EXPORT_SYMBOL(drm_fb_helper_initial_config);
2210
2211 /**
2212  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2213  *                               probing all the outputs attached to the fb
2214  * @fb_helper: the drm_fb_helper
2215  *
2216  * Scan the connectors attached to the fb_helper and try to put together a
2217  * setup after *notification of a change in output configuration.
2218  *
2219  * Called at runtime, takes the mode config locks to be able to check/change the
2220  * modeset configuration. Must be run from process context (which usually means
2221  * either the output polling work or a work item launched from the driver's
2222  * hotplug interrupt).
2223  *
2224  * Note that drivers may call this even before calling
2225  * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2226  * for a race-free fbcon setup and will make sure that the fbdev emulation will
2227  * not miss any hotplug events.
2228  *
2229  * RETURNS:
2230  * 0 on success and a non-zero error code otherwise.
2231  */
2232 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2233 {
2234         struct drm_device *dev = fb_helper->dev;
2235         u32 max_width, max_height;
2236
2237         if (!drm_fbdev_emulation)
2238                 return 0;
2239
2240         mutex_lock(&fb_helper->dev->mode_config.mutex);
2241         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
2242                 fb_helper->delayed_hotplug = true;
2243                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
2244                 return 0;
2245         }
2246         DRM_DEBUG_KMS("\n");
2247
2248         max_width = fb_helper->fb->width;
2249         max_height = fb_helper->fb->height;
2250
2251         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
2252         mutex_unlock(&fb_helper->dev->mode_config.mutex);
2253
2254         drm_modeset_lock_all(dev);
2255         drm_setup_crtcs(fb_helper);
2256         drm_modeset_unlock_all(dev);
2257         drm_fb_helper_set_par(fb_helper->fbdev);
2258
2259         return 0;
2260 }
2261 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2262
2263 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2264  * but the module doesn't depend on any fb console symbols.  At least
2265  * attempt to load fbcon to avoid leaving the system without a usable console.
2266  */
2267 int __init drm_fb_helper_modinit(void)
2268 {
2269 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2270         const char *name = "fbcon";
2271         struct module *fbcon;
2272
2273         mutex_lock(&module_mutex);
2274         fbcon = find_module(name);
2275         mutex_unlock(&module_mutex);
2276
2277         if (!fbcon)
2278                 request_module_nowait(name);
2279 #endif
2280         return 0;
2281 }
2282 EXPORT_SYMBOL(drm_fb_helper_modinit);