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, 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
1046         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
1047                 u32 *palette;
1048                 u32 value;
1049                 /* place color in psuedopalette */
1050                 if (regno > 16)
1051                         return -EINVAL;
1052                 palette = (u32 *)info->pseudo_palette;
1053                 red >>= (16 - info->var.red.length);
1054                 green >>= (16 - info->var.green.length);
1055                 blue >>= (16 - info->var.blue.length);
1056                 value = (red << info->var.red.offset) |
1057                         (green << info->var.green.offset) |
1058                         (blue << info->var.blue.offset);
1059                 if (info->var.transp.length > 0) {
1060                         u32 mask = (1 << info->var.transp.length) - 1;
1061                         mask <<= info->var.transp.offset;
1062                         value |= mask;
1063                 }
1064                 palette[regno] = value;
1065                 return 0;
1066         }
1067
1068         /*
1069          * The driver really shouldn't advertise pseudo/directcolor
1070          * visuals if it can't deal with the palette.
1071          */
1072         if (WARN_ON(!fb_helper->funcs->gamma_set ||
1073                     !fb_helper->funcs->gamma_get))
1074                 return -EINVAL;
1075
1076         WARN_ON(fb->bits_per_pixel != 8);
1077
1078         fb_helper->funcs->gamma_set(crtc, red, green, blue, regno);
1079
1080         return 0;
1081 }
1082
1083 /**
1084  * drm_fb_helper_setcmap - implementation for ->fb_setcmap
1085  * @cmap: cmap to set
1086  * @info: fbdev registered by the helper
1087  */
1088 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1089 {
1090         struct drm_fb_helper *fb_helper = info->par;
1091         struct drm_device *dev = fb_helper->dev;
1092         const struct drm_crtc_helper_funcs *crtc_funcs;
1093         u16 *red, *green, *blue, *transp;
1094         struct drm_crtc *crtc;
1095         int i, j, rc = 0;
1096         int start;
1097
1098         if (oops_in_progress)
1099                 return -EBUSY;
1100
1101         drm_modeset_lock_all(dev);
1102         if (!drm_fb_helper_is_bound(fb_helper)) {
1103                 drm_modeset_unlock_all(dev);
1104                 return -EBUSY;
1105         }
1106
1107         for (i = 0; i < fb_helper->crtc_count; i++) {
1108                 crtc = fb_helper->crtc_info[i].mode_set.crtc;
1109                 crtc_funcs = crtc->helper_private;
1110
1111                 red = cmap->red;
1112                 green = cmap->green;
1113                 blue = cmap->blue;
1114                 transp = cmap->transp;
1115                 start = cmap->start;
1116
1117                 for (j = 0; j < cmap->len; j++) {
1118                         u16 hred, hgreen, hblue, htransp = 0xffff;
1119
1120                         hred = *red++;
1121                         hgreen = *green++;
1122                         hblue = *blue++;
1123
1124                         if (transp)
1125                                 htransp = *transp++;
1126
1127                         rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
1128                         if (rc)
1129                                 goto out;
1130                 }
1131                 if (crtc_funcs->load_lut)
1132                         crtc_funcs->load_lut(crtc);
1133         }
1134  out:
1135         drm_modeset_unlock_all(dev);
1136         return rc;
1137 }
1138 EXPORT_SYMBOL(drm_fb_helper_setcmap);
1139
1140 /**
1141  * drm_fb_helper_check_var - implementation for ->fb_check_var
1142  * @var: screeninfo to check
1143  * @info: fbdev registered by the helper
1144  */
1145 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
1146                             struct fb_info *info)
1147 {
1148         struct drm_fb_helper *fb_helper = info->par;
1149         struct drm_framebuffer *fb = fb_helper->fb;
1150         int depth;
1151
1152         if (var->pixclock != 0 || in_dbg_master())
1153                 return -EINVAL;
1154
1155         /* Need to resize the fb object !!! */
1156         if (var->bits_per_pixel > fb->bits_per_pixel ||
1157             var->xres > fb->width || var->yres > fb->height ||
1158             var->xres_virtual > fb->width || var->yres_virtual > fb->height) {
1159                 DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
1160                           "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
1161                           var->xres, var->yres, var->bits_per_pixel,
1162                           var->xres_virtual, var->yres_virtual,
1163                           fb->width, fb->height, fb->bits_per_pixel);
1164                 return -EINVAL;
1165         }
1166
1167         switch (var->bits_per_pixel) {
1168         case 16:
1169                 depth = (var->green.length == 6) ? 16 : 15;
1170                 break;
1171         case 32:
1172                 depth = (var->transp.length > 0) ? 32 : 24;
1173                 break;
1174         default:
1175                 depth = var->bits_per_pixel;
1176                 break;
1177         }
1178
1179         switch (depth) {
1180         case 8:
1181                 var->red.offset = 0;
1182                 var->green.offset = 0;
1183                 var->blue.offset = 0;
1184                 var->red.length = 8;
1185                 var->green.length = 8;
1186                 var->blue.length = 8;
1187                 var->transp.length = 0;
1188                 var->transp.offset = 0;
1189                 break;
1190         case 15:
1191                 var->red.offset = 10;
1192                 var->green.offset = 5;
1193                 var->blue.offset = 0;
1194                 var->red.length = 5;
1195                 var->green.length = 5;
1196                 var->blue.length = 5;
1197                 var->transp.length = 1;
1198                 var->transp.offset = 15;
1199                 break;
1200         case 16:
1201                 var->red.offset = 11;
1202                 var->green.offset = 5;
1203                 var->blue.offset = 0;
1204                 var->red.length = 5;
1205                 var->green.length = 6;
1206                 var->blue.length = 5;
1207                 var->transp.length = 0;
1208                 var->transp.offset = 0;
1209                 break;
1210         case 24:
1211                 var->red.offset = 16;
1212                 var->green.offset = 8;
1213                 var->blue.offset = 0;
1214                 var->red.length = 8;
1215                 var->green.length = 8;
1216                 var->blue.length = 8;
1217                 var->transp.length = 0;
1218                 var->transp.offset = 0;
1219                 break;
1220         case 32:
1221                 var->red.offset = 16;
1222                 var->green.offset = 8;
1223                 var->blue.offset = 0;
1224                 var->red.length = 8;
1225                 var->green.length = 8;
1226                 var->blue.length = 8;
1227                 var->transp.length = 8;
1228                 var->transp.offset = 24;
1229                 break;
1230         default:
1231                 return -EINVAL;
1232         }
1233         return 0;
1234 }
1235 EXPORT_SYMBOL(drm_fb_helper_check_var);
1236
1237 /**
1238  * drm_fb_helper_set_par - implementation for ->fb_set_par
1239  * @info: fbdev registered by the helper
1240  *
1241  * This will let fbcon do the mode init and is called at initialization time by
1242  * the fbdev core when registering the driver, and later on through the hotplug
1243  * callback.
1244  */
1245 int drm_fb_helper_set_par(struct fb_info *info)
1246 {
1247         struct drm_fb_helper *fb_helper = info->par;
1248         struct fb_var_screeninfo *var = &info->var;
1249
1250         if (oops_in_progress)
1251                 return -EBUSY;
1252
1253         if (var->pixclock != 0) {
1254                 DRM_ERROR("PIXEL CLOCK SET\n");
1255                 return -EINVAL;
1256         }
1257
1258         drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
1259
1260         return 0;
1261 }
1262 EXPORT_SYMBOL(drm_fb_helper_set_par);
1263
1264 static int pan_display_atomic(struct fb_var_screeninfo *var,
1265                               struct fb_info *info)
1266 {
1267         struct drm_fb_helper *fb_helper = info->par;
1268         struct drm_device *dev = fb_helper->dev;
1269         struct drm_atomic_state *state;
1270         struct drm_plane *plane;
1271         int i, ret;
1272         unsigned plane_mask;
1273
1274         state = drm_atomic_state_alloc(dev);
1275         if (!state)
1276                 return -ENOMEM;
1277
1278         state->acquire_ctx = dev->mode_config.acquire_ctx;
1279 retry:
1280         plane_mask = 0;
1281         for(i = 0; i < fb_helper->crtc_count; i++) {
1282                 struct drm_mode_set *mode_set;
1283
1284                 mode_set = &fb_helper->crtc_info[i].mode_set;
1285
1286                 mode_set->x = var->xoffset;
1287                 mode_set->y = var->yoffset;
1288
1289                 ret = __drm_atomic_helper_set_config(mode_set, state);
1290                 if (ret != 0)
1291                         goto fail;
1292
1293                 plane = mode_set->crtc->primary;
1294                 plane_mask |= (1 << drm_plane_index(plane));
1295                 plane->old_fb = plane->fb;
1296         }
1297
1298         ret = drm_atomic_commit(state);
1299         if (ret != 0)
1300                 goto fail;
1301
1302         info->var.xoffset = var->xoffset;
1303         info->var.yoffset = var->yoffset;
1304
1305
1306 fail:
1307         drm_atomic_clean_old_fb(dev, plane_mask, ret);
1308
1309         if (ret == -EDEADLK)
1310                 goto backoff;
1311
1312         if (ret != 0)
1313                 drm_atomic_state_free(state);
1314
1315         return ret;
1316
1317 backoff:
1318         drm_atomic_state_clear(state);
1319         drm_atomic_legacy_backoff(state);
1320
1321         goto retry;
1322 }
1323
1324 /**
1325  * drm_fb_helper_pan_display - implementation for ->fb_pan_display
1326  * @var: updated screen information
1327  * @info: fbdev registered by the helper
1328  */
1329 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
1330                               struct fb_info *info)
1331 {
1332         struct drm_fb_helper *fb_helper = info->par;
1333         struct drm_device *dev = fb_helper->dev;
1334         struct drm_mode_set *modeset;
1335         int ret = 0;
1336         int i;
1337
1338         if (oops_in_progress)
1339                 return -EBUSY;
1340
1341         drm_modeset_lock_all(dev);
1342         if (!drm_fb_helper_is_bound(fb_helper)) {
1343                 drm_modeset_unlock_all(dev);
1344                 return -EBUSY;
1345         }
1346
1347         if (fb_helper->atomic) {
1348                 ret = pan_display_atomic(var, info);
1349                 goto unlock;
1350         }
1351
1352         for (i = 0; i < fb_helper->crtc_count; i++) {
1353                 modeset = &fb_helper->crtc_info[i].mode_set;
1354
1355                 modeset->x = var->xoffset;
1356                 modeset->y = var->yoffset;
1357
1358                 if (modeset->num_connectors) {
1359                         ret = drm_mode_set_config_internal(modeset);
1360                         if (!ret) {
1361                                 info->var.xoffset = var->xoffset;
1362                                 info->var.yoffset = var->yoffset;
1363                         }
1364                 }
1365         }
1366 unlock:
1367         drm_modeset_unlock_all(dev);
1368         return ret;
1369 }
1370 EXPORT_SYMBOL(drm_fb_helper_pan_display);
1371
1372 /*
1373  * Allocates the backing storage and sets up the fbdev info structure through
1374  * the ->fb_probe callback and then registers the fbdev and sets up the panic
1375  * notifier.
1376  */
1377 static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
1378                                          int preferred_bpp)
1379 {
1380         int ret = 0;
1381         int crtc_count = 0;
1382         int i;
1383         struct fb_info *info;
1384         struct drm_fb_helper_surface_size sizes;
1385         int gamma_size = 0;
1386
1387         memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
1388         sizes.surface_depth = 24;
1389         sizes.surface_bpp = 32;
1390         sizes.fb_width = (unsigned)-1;
1391         sizes.fb_height = (unsigned)-1;
1392
1393         /* if driver picks 8 or 16 by default use that
1394            for both depth/bpp */
1395         if (preferred_bpp != sizes.surface_bpp)
1396                 sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
1397
1398         /* first up get a count of crtcs now in use and new min/maxes width/heights */
1399         for (i = 0; i < fb_helper->connector_count; i++) {
1400                 struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
1401                 struct drm_cmdline_mode *cmdline_mode;
1402
1403                 cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1404
1405                 if (cmdline_mode->bpp_specified) {
1406                         switch (cmdline_mode->bpp) {
1407                         case 8:
1408                                 sizes.surface_depth = sizes.surface_bpp = 8;
1409                                 break;
1410                         case 15:
1411                                 sizes.surface_depth = 15;
1412                                 sizes.surface_bpp = 16;
1413                                 break;
1414                         case 16:
1415                                 sizes.surface_depth = sizes.surface_bpp = 16;
1416                                 break;
1417                         case 24:
1418                                 sizes.surface_depth = sizes.surface_bpp = 24;
1419                                 break;
1420                         case 32:
1421                                 sizes.surface_depth = 24;
1422                                 sizes.surface_bpp = 32;
1423                                 break;
1424                         }
1425                         break;
1426                 }
1427         }
1428
1429         crtc_count = 0;
1430         for (i = 0; i < fb_helper->crtc_count; i++) {
1431                 struct drm_display_mode *desired_mode;
1432                 struct drm_mode_set *mode_set;
1433                 int x, y, j;
1434                 /* in case of tile group, are we the last tile vert or horiz?
1435                  * If no tile group you are always the last one both vertically
1436                  * and horizontally
1437                  */
1438                 bool lastv = true, lasth = true;
1439
1440                 desired_mode = fb_helper->crtc_info[i].desired_mode;
1441                 mode_set = &fb_helper->crtc_info[i].mode_set;
1442
1443                 if (!desired_mode)
1444                         continue;
1445
1446                 crtc_count++;
1447
1448                 x = fb_helper->crtc_info[i].x;
1449                 y = fb_helper->crtc_info[i].y;
1450
1451                 if (gamma_size == 0)
1452                         gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
1453
1454                 sizes.surface_width  = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width);
1455                 sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height);
1456
1457                 for (j = 0; j < mode_set->num_connectors; j++) {
1458                         struct drm_connector *connector = mode_set->connectors[j];
1459                         if (connector->has_tile) {
1460                                 lasth = (connector->tile_h_loc == (connector->num_h_tile - 1));
1461                                 lastv = (connector->tile_v_loc == (connector->num_v_tile - 1));
1462                                 /* cloning to multiple tiles is just crazy-talk, so: */
1463                                 break;
1464                         }
1465                 }
1466
1467                 if (lasth)
1468                         sizes.fb_width  = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width);
1469                 if (lastv)
1470                         sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height);
1471         }
1472
1473         if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
1474                 /* hmm everyone went away - assume VGA cable just fell out
1475                    and will come back later. */
1476                 DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
1477                 sizes.fb_width = sizes.surface_width = 1024;
1478                 sizes.fb_height = sizes.surface_height = 768;
1479         }
1480
1481         /* push down into drivers */
1482         ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
1483         if (ret < 0)
1484                 return ret;
1485
1486         info = fb_helper->fbdev;
1487
1488         /*
1489          * Set the fb pointer - usually drm_setup_crtcs does this for hotplug
1490          * events, but at init time drm_setup_crtcs needs to be called before
1491          * the fb is allocated (since we need to figure out the desired size of
1492          * the fb before we can allocate it ...). Hence we need to fix things up
1493          * here again.
1494          */
1495         for (i = 0; i < fb_helper->crtc_count; i++)
1496                 if (fb_helper->crtc_info[i].mode_set.num_connectors)
1497                         fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
1498
1499
1500         info->var.pixclock = 0;
1501         if (register_framebuffer(info) < 0)
1502                 return -EINVAL;
1503
1504         dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n",
1505                         info->node, info->fix.id);
1506
1507         if (list_empty(&kernel_fb_helper_list)) {
1508                 register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
1509         }
1510
1511         list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
1512
1513         return 0;
1514 }
1515
1516 /**
1517  * drm_fb_helper_fill_fix - initializes fixed fbdev information
1518  * @info: fbdev registered by the helper
1519  * @pitch: desired pitch
1520  * @depth: desired depth
1521  *
1522  * Helper to fill in the fixed fbdev information useful for a non-accelerated
1523  * fbdev emulations. Drivers which support acceleration methods which impose
1524  * additional constraints need to set up their own limits.
1525  *
1526  * Drivers should call this (or their equivalent setup code) from their
1527  * ->fb_probe callback.
1528  */
1529 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
1530                             uint32_t depth)
1531 {
1532         info->fix.type = FB_TYPE_PACKED_PIXELS;
1533         info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
1534                 FB_VISUAL_TRUECOLOR;
1535         info->fix.mmio_start = 0;
1536         info->fix.mmio_len = 0;
1537         info->fix.type_aux = 0;
1538         info->fix.xpanstep = 1; /* doing it in hw */
1539         info->fix.ypanstep = 1; /* doing it in hw */
1540         info->fix.ywrapstep = 0;
1541         info->fix.accel = FB_ACCEL_NONE;
1542
1543         info->fix.line_length = pitch;
1544         return;
1545 }
1546 EXPORT_SYMBOL(drm_fb_helper_fill_fix);
1547
1548 /**
1549  * drm_fb_helper_fill_var - initalizes variable fbdev information
1550  * @info: fbdev instance to set up
1551  * @fb_helper: fb helper instance to use as template
1552  * @fb_width: desired fb width
1553  * @fb_height: desired fb height
1554  *
1555  * Sets up the variable fbdev metainformation from the given fb helper instance
1556  * and the drm framebuffer allocated in fb_helper->fb.
1557  *
1558  * Drivers should call this (or their equivalent setup code) from their
1559  * ->fb_probe callback after having allocated the fbdev backing
1560  * storage framebuffer.
1561  */
1562 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
1563                             uint32_t fb_width, uint32_t fb_height)
1564 {
1565         struct drm_framebuffer *fb = fb_helper->fb;
1566         info->pseudo_palette = fb_helper->pseudo_palette;
1567         info->var.xres_virtual = fb->width;
1568         info->var.yres_virtual = fb->height;
1569         info->var.bits_per_pixel = fb->bits_per_pixel;
1570         info->var.accel_flags = FB_ACCELF_TEXT;
1571         info->var.xoffset = 0;
1572         info->var.yoffset = 0;
1573         info->var.activate = FB_ACTIVATE_NOW;
1574         info->var.height = -1;
1575         info->var.width = -1;
1576
1577         switch (fb->depth) {
1578         case 8:
1579                 info->var.red.offset = 0;
1580                 info->var.green.offset = 0;
1581                 info->var.blue.offset = 0;
1582                 info->var.red.length = 8; /* 8bit DAC */
1583                 info->var.green.length = 8;
1584                 info->var.blue.length = 8;
1585                 info->var.transp.offset = 0;
1586                 info->var.transp.length = 0;
1587                 break;
1588         case 15:
1589                 info->var.red.offset = 10;
1590                 info->var.green.offset = 5;
1591                 info->var.blue.offset = 0;
1592                 info->var.red.length = 5;
1593                 info->var.green.length = 5;
1594                 info->var.blue.length = 5;
1595                 info->var.transp.offset = 15;
1596                 info->var.transp.length = 1;
1597                 break;
1598         case 16:
1599                 info->var.red.offset = 11;
1600                 info->var.green.offset = 5;
1601                 info->var.blue.offset = 0;
1602                 info->var.red.length = 5;
1603                 info->var.green.length = 6;
1604                 info->var.blue.length = 5;
1605                 info->var.transp.offset = 0;
1606                 break;
1607         case 24:
1608                 info->var.red.offset = 16;
1609                 info->var.green.offset = 8;
1610                 info->var.blue.offset = 0;
1611                 info->var.red.length = 8;
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 32:
1618                 info->var.red.offset = 16;
1619                 info->var.green.offset = 8;
1620                 info->var.blue.offset = 0;
1621                 info->var.red.length = 8;
1622                 info->var.green.length = 8;
1623                 info->var.blue.length = 8;
1624                 info->var.transp.offset = 24;
1625                 info->var.transp.length = 8;
1626                 break;
1627         default:
1628                 break;
1629         }
1630
1631         info->var.xres = fb_width;
1632         info->var.yres = fb_height;
1633 }
1634 EXPORT_SYMBOL(drm_fb_helper_fill_var);
1635
1636 static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
1637                                                uint32_t maxX,
1638                                                uint32_t maxY)
1639 {
1640         struct drm_connector *connector;
1641         int count = 0;
1642         int i;
1643
1644         for (i = 0; i < fb_helper->connector_count; i++) {
1645                 connector = fb_helper->connector_info[i]->connector;
1646                 count += connector->funcs->fill_modes(connector, maxX, maxY);
1647         }
1648
1649         return count;
1650 }
1651
1652 struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
1653 {
1654         struct drm_display_mode *mode;
1655
1656         list_for_each_entry(mode, &fb_connector->connector->modes, head) {
1657                 if (mode->hdisplay > width ||
1658                     mode->vdisplay > height)
1659                         continue;
1660                 if (mode->type & DRM_MODE_TYPE_PREFERRED)
1661                         return mode;
1662         }
1663         return NULL;
1664 }
1665 EXPORT_SYMBOL(drm_has_preferred_mode);
1666
1667 static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
1668 {
1669         return fb_connector->connector->cmdline_mode.specified;
1670 }
1671
1672 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
1673                                                       int width, int height)
1674 {
1675         struct drm_cmdline_mode *cmdline_mode;
1676         struct drm_display_mode *mode;
1677         bool prefer_non_interlace;
1678
1679         cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
1680         if (cmdline_mode->specified == false)
1681                 return NULL;
1682
1683         /* attempt to find a matching mode in the list of modes
1684          *  we have gotten so far, if not add a CVT mode that conforms
1685          */
1686         if (cmdline_mode->rb || cmdline_mode->margins)
1687                 goto create_mode;
1688
1689         prefer_non_interlace = !cmdline_mode->interlace;
1690 again:
1691         list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1692                 /* check width/height */
1693                 if (mode->hdisplay != cmdline_mode->xres ||
1694                     mode->vdisplay != cmdline_mode->yres)
1695                         continue;
1696
1697                 if (cmdline_mode->refresh_specified) {
1698                         if (mode->vrefresh != cmdline_mode->refresh)
1699                                 continue;
1700                 }
1701
1702                 if (cmdline_mode->interlace) {
1703                         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
1704                                 continue;
1705                 } else if (prefer_non_interlace) {
1706                         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1707                                 continue;
1708                 }
1709                 return mode;
1710         }
1711
1712         if (prefer_non_interlace) {
1713                 prefer_non_interlace = false;
1714                 goto again;
1715         }
1716
1717 create_mode:
1718         mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
1719                                                  cmdline_mode);
1720         list_add(&mode->head, &fb_helper_conn->connector->modes);
1721         return mode;
1722 }
1723 EXPORT_SYMBOL(drm_pick_cmdline_mode);
1724
1725 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
1726 {
1727         bool enable;
1728
1729         if (strict)
1730                 enable = connector->status == connector_status_connected;
1731         else
1732                 enable = connector->status != connector_status_disconnected;
1733
1734         return enable;
1735 }
1736
1737 static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
1738                                   bool *enabled)
1739 {
1740         bool any_enabled = false;
1741         struct drm_connector *connector;
1742         int i = 0;
1743
1744         for (i = 0; i < fb_helper->connector_count; i++) {
1745                 connector = fb_helper->connector_info[i]->connector;
1746                 enabled[i] = drm_connector_enabled(connector, true);
1747                 DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
1748                           enabled[i] ? "yes" : "no");
1749                 any_enabled |= enabled[i];
1750         }
1751
1752         if (any_enabled)
1753                 return;
1754
1755         for (i = 0; i < fb_helper->connector_count; i++) {
1756                 connector = fb_helper->connector_info[i]->connector;
1757                 enabled[i] = drm_connector_enabled(connector, false);
1758         }
1759 }
1760
1761 static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
1762                               struct drm_display_mode **modes,
1763                               struct drm_fb_offset *offsets,
1764                               bool *enabled, int width, int height)
1765 {
1766         int count, i, j;
1767         bool can_clone = false;
1768         struct drm_fb_helper_connector *fb_helper_conn;
1769         struct drm_display_mode *dmt_mode, *mode;
1770
1771         /* only contemplate cloning in the single crtc case */
1772         if (fb_helper->crtc_count > 1)
1773                 return false;
1774
1775         count = 0;
1776         for (i = 0; i < fb_helper->connector_count; i++) {
1777                 if (enabled[i])
1778                         count++;
1779         }
1780
1781         /* only contemplate cloning if more than one connector is enabled */
1782         if (count <= 1)
1783                 return false;
1784
1785         /* check the command line or if nothing common pick 1024x768 */
1786         can_clone = true;
1787         for (i = 0; i < fb_helper->connector_count; i++) {
1788                 if (!enabled[i])
1789                         continue;
1790                 fb_helper_conn = fb_helper->connector_info[i];
1791                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1792                 if (!modes[i]) {
1793                         can_clone = false;
1794                         break;
1795                 }
1796                 for (j = 0; j < i; j++) {
1797                         if (!enabled[j])
1798                                 continue;
1799                         if (!drm_mode_equal(modes[j], modes[i]))
1800                                 can_clone = false;
1801                 }
1802         }
1803
1804         if (can_clone) {
1805                 DRM_DEBUG_KMS("can clone using command line\n");
1806                 return true;
1807         }
1808
1809         /* try and find a 1024x768 mode on each connector */
1810         can_clone = true;
1811         dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);
1812
1813         for (i = 0; i < fb_helper->connector_count; i++) {
1814
1815                 if (!enabled[i])
1816                         continue;
1817
1818                 fb_helper_conn = fb_helper->connector_info[i];
1819                 list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
1820                         if (drm_mode_equal(mode, dmt_mode))
1821                                 modes[i] = mode;
1822                 }
1823                 if (!modes[i])
1824                         can_clone = false;
1825         }
1826
1827         if (can_clone) {
1828                 DRM_DEBUG_KMS("can clone using 1024x768\n");
1829                 return true;
1830         }
1831         DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
1832         return false;
1833 }
1834
1835 static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper,
1836                                 struct drm_display_mode **modes,
1837                                 struct drm_fb_offset *offsets,
1838                                 int idx,
1839                                 int h_idx, int v_idx)
1840 {
1841         struct drm_fb_helper_connector *fb_helper_conn;
1842         int i;
1843         int hoffset = 0, voffset = 0;
1844
1845         for (i = 0; i < fb_helper->connector_count; i++) {
1846                 fb_helper_conn = fb_helper->connector_info[i];
1847                 if (!fb_helper_conn->connector->has_tile)
1848                         continue;
1849
1850                 if (!modes[i] && (h_idx || v_idx)) {
1851                         DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
1852                                       fb_helper_conn->connector->base.id);
1853                         continue;
1854                 }
1855                 if (fb_helper_conn->connector->tile_h_loc < h_idx)
1856                         hoffset += modes[i]->hdisplay;
1857
1858                 if (fb_helper_conn->connector->tile_v_loc < v_idx)
1859                         voffset += modes[i]->vdisplay;
1860         }
1861         offsets[idx].x = hoffset;
1862         offsets[idx].y = voffset;
1863         DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
1864         return 0;
1865 }
1866
1867 static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
1868                                  struct drm_display_mode **modes,
1869                                  struct drm_fb_offset *offsets,
1870                                  bool *enabled, int width, int height)
1871 {
1872         struct drm_fb_helper_connector *fb_helper_conn;
1873         int i;
1874         uint64_t conn_configured = 0, mask;
1875         int tile_pass = 0;
1876         mask = (1 << fb_helper->connector_count) - 1;
1877 retry:
1878         for (i = 0; i < fb_helper->connector_count; i++) {
1879                 fb_helper_conn = fb_helper->connector_info[i];
1880
1881                 if (conn_configured & (1 << i))
1882                         continue;
1883
1884                 if (enabled[i] == false) {
1885                         conn_configured |= (1 << i);
1886                         continue;
1887                 }
1888
1889                 /* first pass over all the untiled connectors */
1890                 if (tile_pass == 0 && fb_helper_conn->connector->has_tile)
1891                         continue;
1892
1893                 if (tile_pass == 1) {
1894                         if (fb_helper_conn->connector->tile_h_loc != 0 ||
1895                             fb_helper_conn->connector->tile_v_loc != 0)
1896                                 continue;
1897
1898                 } else {
1899                         if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 &&
1900                             fb_helper_conn->connector->tile_v_loc != tile_pass - 1)
1901                         /* if this tile_pass doesn't cover any of the tiles - keep going */
1902                                 continue;
1903
1904                         /* find the tile offsets for this pass - need
1905                            to find all tiles left and above */
1906                         drm_get_tile_offsets(fb_helper, modes, offsets,
1907                                              i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc);
1908                 }
1909                 DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
1910                               fb_helper_conn->connector->base.id);
1911
1912                 /* got for command line mode first */
1913                 modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
1914                 if (!modes[i]) {
1915                         DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
1916                                       fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0);
1917                         modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
1918                 }
1919                 /* No preferred modes, pick one off the list */
1920                 if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
1921                         list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
1922                                 break;
1923                 }
1924                 DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
1925                           "none");
1926                 conn_configured |= (1 << i);
1927         }
1928
1929         if ((conn_configured & mask) != mask) {
1930                 tile_pass++;
1931                 goto retry;
1932         }
1933         return true;
1934 }
1935
1936 static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
1937                           struct drm_fb_helper_crtc **best_crtcs,
1938                           struct drm_display_mode **modes,
1939                           int n, int width, int height)
1940 {
1941         int c, o;
1942         struct drm_connector *connector;
1943         const struct drm_connector_helper_funcs *connector_funcs;
1944         struct drm_encoder *encoder;
1945         int my_score, best_score, score;
1946         struct drm_fb_helper_crtc **crtcs, *crtc;
1947         struct drm_fb_helper_connector *fb_helper_conn;
1948
1949         if (n == fb_helper->connector_count)
1950                 return 0;
1951
1952         fb_helper_conn = fb_helper->connector_info[n];
1953         connector = fb_helper_conn->connector;
1954
1955         best_crtcs[n] = NULL;
1956         best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
1957         if (modes[n] == NULL)
1958                 return best_score;
1959
1960         crtcs = kzalloc(fb_helper->connector_count *
1961                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
1962         if (!crtcs)
1963                 return best_score;
1964
1965         my_score = 1;
1966         if (connector->status == connector_status_connected)
1967                 my_score++;
1968         if (drm_has_cmdline_mode(fb_helper_conn))
1969                 my_score++;
1970         if (drm_has_preferred_mode(fb_helper_conn, width, height))
1971                 my_score++;
1972
1973         connector_funcs = connector->helper_private;
1974         encoder = connector_funcs->best_encoder(connector);
1975         if (!encoder)
1976                 goto out;
1977
1978         /* select a crtc for this connector and then attempt to configure
1979            remaining connectors */
1980         for (c = 0; c < fb_helper->crtc_count; c++) {
1981                 crtc = &fb_helper->crtc_info[c];
1982
1983                 if ((encoder->possible_crtcs & (1 << c)) == 0)
1984                         continue;
1985
1986                 for (o = 0; o < n; o++)
1987                         if (best_crtcs[o] == crtc)
1988                                 break;
1989
1990                 if (o < n) {
1991                         /* ignore cloning unless only a single crtc */
1992                         if (fb_helper->crtc_count > 1)
1993                                 continue;
1994
1995                         if (!drm_mode_equal(modes[o], modes[n]))
1996                                 continue;
1997                 }
1998
1999                 crtcs[n] = crtc;
2000                 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
2001                 score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
2002                                                   width, height);
2003                 if (score > best_score) {
2004                         best_score = score;
2005                         memcpy(best_crtcs, crtcs,
2006                                fb_helper->connector_count *
2007                                sizeof(struct drm_fb_helper_crtc *));
2008                 }
2009         }
2010 out:
2011         kfree(crtcs);
2012         return best_score;
2013 }
2014
2015 static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
2016 {
2017         struct drm_device *dev = fb_helper->dev;
2018         struct drm_fb_helper_crtc **crtcs;
2019         struct drm_display_mode **modes;
2020         struct drm_fb_offset *offsets;
2021         struct drm_mode_set *modeset;
2022         bool *enabled;
2023         int width, height;
2024         int i;
2025
2026         DRM_DEBUG_KMS("\n");
2027
2028         width = dev->mode_config.max_width;
2029         height = dev->mode_config.max_height;
2030
2031         crtcs = kcalloc(fb_helper->connector_count,
2032                         sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
2033         modes = kcalloc(fb_helper->connector_count,
2034                         sizeof(struct drm_display_mode *), GFP_KERNEL);
2035         offsets = kcalloc(fb_helper->connector_count,
2036                           sizeof(struct drm_fb_offset), GFP_KERNEL);
2037         enabled = kcalloc(fb_helper->connector_count,
2038                           sizeof(bool), GFP_KERNEL);
2039         if (!crtcs || !modes || !enabled || !offsets) {
2040                 DRM_ERROR("Memory allocation failed\n");
2041                 goto out;
2042         }
2043
2044
2045         drm_enable_connectors(fb_helper, enabled);
2046
2047         if (!(fb_helper->funcs->initial_config &&
2048               fb_helper->funcs->initial_config(fb_helper, crtcs, modes,
2049                                                offsets,
2050                                                enabled, width, height))) {
2051                 memset(modes, 0, fb_helper->connector_count*sizeof(modes[0]));
2052                 memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0]));
2053                 memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0]));
2054
2055                 if (!drm_target_cloned(fb_helper, modes, offsets,
2056                                        enabled, width, height) &&
2057                     !drm_target_preferred(fb_helper, modes, offsets,
2058                                           enabled, width, height))
2059                         DRM_ERROR("Unable to find initial modes\n");
2060
2061                 DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
2062                               width, height);
2063
2064                 drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
2065         }
2066
2067         /* need to set the modesets up here for use later */
2068         /* fill out the connector<->crtc mappings into the modesets */
2069         for (i = 0; i < fb_helper->crtc_count; i++) {
2070                 modeset = &fb_helper->crtc_info[i].mode_set;
2071                 modeset->num_connectors = 0;
2072                 modeset->fb = NULL;
2073         }
2074
2075         for (i = 0; i < fb_helper->connector_count; i++) {
2076                 struct drm_display_mode *mode = modes[i];
2077                 struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
2078                 struct drm_fb_offset *offset = &offsets[i];
2079                 modeset = &fb_crtc->mode_set;
2080
2081                 if (mode && fb_crtc) {
2082                         DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
2083                                       mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y);
2084                         fb_crtc->desired_mode = mode;
2085                         fb_crtc->x = offset->x;
2086                         fb_crtc->y = offset->y;
2087                         if (modeset->mode)
2088                                 drm_mode_destroy(dev, modeset->mode);
2089                         modeset->mode = drm_mode_duplicate(dev,
2090                                                            fb_crtc->desired_mode);
2091                         modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
2092                         modeset->fb = fb_helper->fb;
2093                         modeset->x = offset->x;
2094                         modeset->y = offset->y;
2095                 }
2096         }
2097
2098         /* Clear out any old modes if there are no more connected outputs. */
2099         for (i = 0; i < fb_helper->crtc_count; i++) {
2100                 modeset = &fb_helper->crtc_info[i].mode_set;
2101                 if (modeset->num_connectors == 0) {
2102                         BUG_ON(modeset->fb);
2103                         if (modeset->mode)
2104                                 drm_mode_destroy(dev, modeset->mode);
2105                         modeset->mode = NULL;
2106                 }
2107         }
2108 out:
2109         kfree(crtcs);
2110         kfree(modes);
2111         kfree(offsets);
2112         kfree(enabled);
2113 }
2114
2115 /**
2116  * drm_fb_helper_initial_config - setup a sane initial connector configuration
2117  * @fb_helper: fb_helper device struct
2118  * @bpp_sel: bpp value to use for the framebuffer configuration
2119  *
2120  * Scans the CRTCs and connectors and tries to put together an initial setup.
2121  * At the moment, this is a cloned configuration across all heads with
2122  * a new framebuffer object as the backing store.
2123  *
2124  * Note that this also registers the fbdev and so allows userspace to call into
2125  * the driver through the fbdev interfaces.
2126  *
2127  * This function will call down into the ->fb_probe callback to let
2128  * the driver allocate and initialize the fbdev info structure and the drm
2129  * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
2130  * drm_fb_helper_fill_fix() are provided as helpers to setup simple default
2131  * values for the fbdev info structure.
2132  *
2133  * HANG DEBUGGING:
2134  *
2135  * When you have fbcon support built-in or already loaded, this function will do
2136  * a full modeset to setup the fbdev console. Due to locking misdesign in the
2137  * VT/fbdev subsystem that entire modeset sequence has to be done while holding
2138  * console_lock. Until console_unlock is called no dmesg lines will be sent out
2139  * to consoles, not even serial console. This means when your driver crashes,
2140  * you will see absolutely nothing else but a system stuck in this function,
2141  * with no further output. Any kind of printk() you place within your own driver
2142  * or in the drm core modeset code will also never show up.
2143  *
2144  * Standard debug practice is to run the fbcon setup without taking the
2145  * console_lock as a hack, to be able to see backtraces and crashes on the
2146  * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel
2147  * cmdline option.
2148  *
2149  * The other option is to just disable fbdev emulation since very likely the
2150  * first modeset from userspace will crash in the same way, and is even easier
2151  * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0
2152  * kernel cmdline option.
2153  *
2154  * RETURNS:
2155  * Zero if everything went ok, nonzero otherwise.
2156  */
2157 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
2158 {
2159         struct drm_device *dev = fb_helper->dev;
2160         int count = 0;
2161
2162         if (!drm_fbdev_emulation)
2163                 return 0;
2164
2165         mutex_lock(&dev->mode_config.mutex);
2166         count = drm_fb_helper_probe_connector_modes(fb_helper,
2167                                                     dev->mode_config.max_width,
2168                                                     dev->mode_config.max_height);
2169         mutex_unlock(&dev->mode_config.mutex);
2170         /*
2171          * we shouldn't end up with no modes here.
2172          */
2173         if (count == 0)
2174                 dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n");
2175
2176         drm_setup_crtcs(fb_helper);
2177
2178         return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
2179 }
2180 EXPORT_SYMBOL(drm_fb_helper_initial_config);
2181
2182 /**
2183  * drm_fb_helper_hotplug_event - respond to a hotplug notification by
2184  *                               probing all the outputs attached to the fb
2185  * @fb_helper: the drm_fb_helper
2186  *
2187  * Scan the connectors attached to the fb_helper and try to put together a
2188  * setup after *notification of a change in output configuration.
2189  *
2190  * Called at runtime, takes the mode config locks to be able to check/change the
2191  * modeset configuration. Must be run from process context (which usually means
2192  * either the output polling work or a work item launched from the driver's
2193  * hotplug interrupt).
2194  *
2195  * Note that drivers may call this even before calling
2196  * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows
2197  * for a race-free fbcon setup and will make sure that the fbdev emulation will
2198  * not miss any hotplug events.
2199  *
2200  * RETURNS:
2201  * 0 on success and a non-zero error code otherwise.
2202  */
2203 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
2204 {
2205         struct drm_device *dev = fb_helper->dev;
2206         u32 max_width, max_height;
2207
2208         if (!drm_fbdev_emulation)
2209                 return 0;
2210
2211         mutex_lock(&fb_helper->dev->mode_config.mutex);
2212         if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) {
2213                 fb_helper->delayed_hotplug = true;
2214                 mutex_unlock(&fb_helper->dev->mode_config.mutex);
2215                 return 0;
2216         }
2217         DRM_DEBUG_KMS("\n");
2218
2219         max_width = fb_helper->fb->width;
2220         max_height = fb_helper->fb->height;
2221
2222         drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
2223         mutex_unlock(&fb_helper->dev->mode_config.mutex);
2224
2225         drm_modeset_lock_all(dev);
2226         drm_setup_crtcs(fb_helper);
2227         drm_modeset_unlock_all(dev);
2228         drm_fb_helper_set_par(fb_helper->fbdev);
2229
2230         return 0;
2231 }
2232 EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
2233
2234 /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
2235  * but the module doesn't depend on any fb console symbols.  At least
2236  * attempt to load fbcon to avoid leaving the system without a usable console.
2237  */
2238 int __init drm_fb_helper_modinit(void)
2239 {
2240 #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
2241         const char *name = "fbcon";
2242         struct module *fbcon;
2243
2244         mutex_lock(&module_mutex);
2245         fbcon = find_module(name);
2246         mutex_unlock(&module_mutex);
2247
2248         if (!fbcon)
2249                 request_module_nowait(name);
2250 #endif
2251         return 0;
2252 }
2253 EXPORT_SYMBOL(drm_fb_helper_modinit);