drivers/gpu/drm/i915/intel_fbdev.c

   1 /*
   2  * Copyright © 2007 David Airlie
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *     David Airlie
  25  */
  26
  27 #include <linux/async.h>
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/console.h>
  31 #include <linux/errno.h>
  32 #include <linux/string.h>
  33 #include <linux/mm.h>
  34 #include <linux/tty.h>
  35 #include <linux/sysrq.h>
  36 #include <linux/delay.h>
  37 #include <linux/init.h>
  38 #include <linux/vga_switcheroo.h>
  39
  40 #include <drm/drmP.h>
  41 #include <drm/drm_crtc.h>
  42 #include <drm/drm_fb_helper.h>
  43 #include "intel_drv.h"
  44 #include "intel_frontbuffer.h"
  45 #include <drm/i915_drm.h>
  46 #include "i915_drv.h"
  47
  48 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  49 {
  50         struct drm_i915_gem_object *obj = ifbdev->fb->obj;
  51         unsigned int origin =
  52                 ifbdev->vma_flags & PLANE_HAS_FENCE ? ORIGIN_GTT : ORIGIN_CPU;
  53
  54         intel_fb_obj_invalidate(obj, origin);
  55 }
  56
  57 static int intel_fbdev_set_par(struct fb_info *info)
  58 {
  59         struct drm_fb_helper *fb_helper = info->par;
  60         struct intel_fbdev *ifbdev =
  61                 container_of(fb_helper, struct intel_fbdev, helper);
  62         int ret;
  63
  64         ret = drm_fb_helper_set_par(info);
  65         if (ret == 0)
  66                 intel_fbdev_invalidate(ifbdev);
  67
  68         return ret;
  69 }
  70
  71 static int intel_fbdev_blank(int blank, struct fb_info *info)
  72 {
  73         struct drm_fb_helper *fb_helper = info->par;
  74         struct intel_fbdev *ifbdev =
  75                 container_of(fb_helper, struct intel_fbdev, helper);
  76         int ret;
  77
  78         ret = drm_fb_helper_blank(blank, info);
  79         if (ret == 0)
  80                 intel_fbdev_invalidate(ifbdev);
  81
  82         return ret;
  83 }
  84
  85 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  86                                    struct fb_info *info)
  87 {
  88         struct drm_fb_helper *fb_helper = info->par;
  89         struct intel_fbdev *ifbdev =
  90                 container_of(fb_helper, struct intel_fbdev, helper);
  91         int ret;
  92
  93         ret = drm_fb_helper_pan_display(var, info);
  94         if (ret == 0)
  95                 intel_fbdev_invalidate(ifbdev);
  96
  97         return ret;
  98 }
  99
 100 static struct fb_ops intelfb_ops = {
 101         .owner = THIS_MODULE,
 102         DRM_FB_HELPER_DEFAULT_OPS,
 103         .fb_set_par = intel_fbdev_set_par,
 104         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 105         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 106         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 107         .fb_pan_display = intel_fbdev_pan_display,
 108         .fb_blank = intel_fbdev_blank,
 109 };
 110
 111 static int intelfb_alloc(struct drm_fb_helper *helper,
 112                          struct drm_fb_helper_surface_size *sizes)
 113 {
 114         struct intel_fbdev *ifbdev =
 115                 container_of(helper, struct intel_fbdev, helper);
 116         struct drm_framebuffer *fb;
 117         struct drm_device *dev = helper->dev;
 118         struct drm_i915_private *dev_priv = to_i915(dev);
 119         struct drm_mode_fb_cmd2 mode_cmd = {};
 120         struct drm_i915_gem_object *obj;
 121         int size, ret;
 122
 123         /* we don't do packed 24bpp */
 124         if (sizes->surface_bpp == 24)
 125                 sizes->surface_bpp = 32;
 126
 127         mode_cmd.width = sizes->surface_width;
 128         mode_cmd.height = sizes->surface_height;
 129
 130         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 131                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 132         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 133                                                           sizes->surface_depth);
 134
 135         size = mode_cmd.pitches[0] * mode_cmd.height;
 136         size = PAGE_ALIGN(size);
 137
 138         /* If the FB is too big, just don't use it since fbdev is not very
 139          * important and we should probably use that space with FBC or other
 140          * features. */
 141         obj = NULL;
 142         if (size * 2 < dev_priv->stolen_usable_size)
 143                 obj = i915_gem_object_create_stolen(dev_priv, size);
 144         if (obj == NULL)
 145                 obj = i915_gem_object_create(dev_priv, size);
 146         if (IS_ERR(obj)) {
 147                 DRM_ERROR("failed to allocate framebuffer\n");
 148                 ret = PTR_ERR(obj);
 149                 goto err;
 150         }
 151
 152         fb = intel_framebuffer_create(obj, &mode_cmd);
 153         if (IS_ERR(fb)) {
 154                 ret = PTR_ERR(fb);
 155                 goto err_obj;
 156         }
 157
 158         ifbdev->fb = to_intel_framebuffer(fb);
 159
 160         return 0;
 161
 162 err_obj:
 163         i915_gem_object_put(obj);
 164 err:
 165         return ret;
 166 }
 167
 168 static int intelfb_create(struct drm_fb_helper *helper,
 169                           struct drm_fb_helper_surface_size *sizes)
 170 {
 171         struct intel_fbdev *ifbdev =
 172                 container_of(helper, struct intel_fbdev, helper);
 173         struct intel_framebuffer *intel_fb = ifbdev->fb;
 174         struct drm_device *dev = helper->dev;
 175         struct drm_i915_private *dev_priv = to_i915(dev);
 176         struct pci_dev *pdev = dev_priv->drm.pdev;
 177         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 178         struct fb_info *info;
 179         struct drm_framebuffer *fb;
 180         struct i915_vma *vma;
 181         unsigned long flags = 0;
 182         bool prealloc = false;
 183         void __iomem *vaddr;
 184         int ret;
 185
 186         if (intel_fb &&
 187             (sizes->fb_width > intel_fb->base.width ||
 188              sizes->fb_height > intel_fb->base.height)) {
 189                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 190                               " releasing it\n",
 191                               intel_fb->base.width, intel_fb->base.height,
 192                               sizes->fb_width, sizes->fb_height);
 193                 drm_framebuffer_put(&intel_fb->base);
 194                 intel_fb = ifbdev->fb = NULL;
 195         }
 196         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 197                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 198                 ret = intelfb_alloc(helper, sizes);
 199                 if (ret)
 200                         return ret;
 201                 intel_fb = ifbdev->fb;
 202         } else {
 203                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 204                 prealloc = true;
 205                 sizes->fb_width = intel_fb->base.width;
 206                 sizes->fb_height = intel_fb->base.height;
 207         }
 208
 209         mutex_lock(&dev->struct_mutex);
 210         intel_runtime_pm_get(dev_priv);
 211
 212         /* Pin the GGTT vma for our access via info->screen_base.
 213          * This also validates that any existing fb inherited from the
 214          * BIOS is suitable for own access.
 215          */
 216         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base,
 217                                          DRM_MODE_ROTATE_0,
 218                                          false, &flags);
 219         if (IS_ERR(vma)) {
 220                 ret = PTR_ERR(vma);
 221                 goto out_unlock;
 222         }
 223
 224         fb = &ifbdev->fb->base;
 225         intel_fb_obj_flush(intel_fb_obj(fb), ORIGIN_DIRTYFB);
 226
 227         info = drm_fb_helper_alloc_fbi(helper);
 228         if (IS_ERR(info)) {
 229                 DRM_ERROR("Failed to allocate fb_info\n");
 230                 ret = PTR_ERR(info);
 231                 goto out_unpin;
 232         }
 233
 234         info->par = helper;
 235
 236         ifbdev->helper.fb = fb;
 237
 238         strcpy(info->fix.id, "inteldrmfb");
 239
 240         info->fbops = &intelfb_ops;
 241
 242         /* setup aperture base/size for vesafb takeover */
 243         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 244         info->apertures->ranges[0].size = ggtt->mappable_end;
 245
 246         info->fix.smem_start = dev->mode_config.fb_base + i915_ggtt_offset(vma);
 247         info->fix.smem_len = vma->node.size;
 248
 249         vaddr = i915_vma_pin_iomap(vma);
 250         if (IS_ERR(vaddr)) {
 251                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 252                 ret = PTR_ERR(vaddr);
 253                 goto out_unpin;
 254         }
 255         info->screen_base = vaddr;
 256         info->screen_size = vma->node.size;
 257
 258         /* This driver doesn't need a VT switch to restore the mode on resume */
 259         info->skip_vt_switch = true;
 260
 261         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 262         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 263
 264         /* If the object is shmemfs backed, it will have given us zeroed pages.
 265          * If the object is stolen however, it will be full of whatever
 266          * garbage was left in there.
 267          */
 268         if (intel_fb->obj->stolen && !prealloc)
 269                 memset_io(info->screen_base, 0, info->screen_size);
 270
 271         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 272
 273         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08x\n",
 274                       fb->width, fb->height, i915_ggtt_offset(vma));
 275         ifbdev->vma = vma;
 276         ifbdev->vma_flags = flags;
 277
 278         intel_runtime_pm_put(dev_priv);
 279         mutex_unlock(&dev->struct_mutex);
 280         vga_switcheroo_client_fb_set(pdev, info);
 281         return 0;
 282
 283 out_unpin:
 284         intel_unpin_fb_vma(vma, flags);
 285 out_unlock:
 286         intel_runtime_pm_put(dev_priv);
 287         mutex_unlock(&dev->struct_mutex);
 288         return ret;
 289 }
 290
 291 static struct drm_fb_helper_crtc *
 292 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 293 {
 294         int i;
 295
 296         for (i = 0; i < fb_helper->crtc_count; i++)
 297                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 298                         return &fb_helper->crtc_info[i];
 299
 300         return NULL;
 301 }
 302
 303 /*
 304  * Try to read the BIOS display configuration and use it for the initial
 305  * fb configuration.
 306  *
 307  * The BIOS or boot loader will generally create an initial display
 308  * configuration for us that includes some set of active pipes and displays.
 309  * This routine tries to figure out which pipes and connectors are active
 310  * and stuffs them into the crtcs and modes array given to us by the
 311  * drm_fb_helper code.
 312  *
 313  * The overall sequence is:
 314  *   intel_fbdev_init - from driver load
 315  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 316  *     drm_fb_helper_init - build fb helper structs
 317  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 318  *   intel_fbdev_initial_config - apply the config
 319  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 320  *         drm_setup_crtcs - build crtc config for fbdev
 321  *           intel_fb_initial_config - find active connectors etc
 322  *         drm_fb_helper_single_fb_probe - set up fbdev
 323  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 324  *
 325  * Note that we don't make special consideration whether we could actually
 326  * switch to the selected modes without a full modeset. E.g. when the display
 327  * is in VGA mode we need to recalculate watermarks and set a new high-res
 328  * framebuffer anyway.
 329  */
 330 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 331                                     struct drm_fb_helper_crtc **crtcs,
 332                                     struct drm_display_mode **modes,
 333                                     struct drm_fb_offset *offsets,
 334                                     bool *enabled, int width, int height)
 335 {
 336         struct drm_i915_private *dev_priv = to_i915(fb_helper->dev);
 337         unsigned long conn_configured, conn_seq, mask;
 338         unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
 339         int i, j;
 340         bool *save_enabled;
 341         bool fallback = true, ret = true;
 342         int num_connectors_enabled = 0;
 343         int num_connectors_detected = 0;
 344         struct drm_modeset_acquire_ctx ctx;
 345
 346         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
 347         if (!save_enabled)
 348                 return false;
 349
 350         drm_modeset_acquire_init(&ctx, 0);
 351
 352         while (drm_modeset_lock_all_ctx(fb_helper->dev, &ctx) != 0)
 353                 drm_modeset_backoff(&ctx);
 354
 355         memcpy(save_enabled, enabled, count);
 356         mask = GENMASK(count - 1, 0);
 357         conn_configured = 0;
 358 retry:
 359         conn_seq = conn_configured;
 360         for (i = 0; i < count; i++) {
 361                 struct drm_fb_helper_connector *fb_conn;
 362                 struct drm_connector *connector;
 363                 struct drm_encoder *encoder;
 364                 struct drm_fb_helper_crtc *new_crtc;
 365
 366                 fb_conn = fb_helper->connector_info[i];
 367                 connector = fb_conn->connector;
 368
 369                 if (conn_configured & BIT(i))
 370                         continue;
 371
 372                 if (conn_seq == 0 && !connector->has_tile)
 373                         continue;
 374
 375                 if (connector->status == connector_status_connected)
 376                         num_connectors_detected++;
 377
 378                 if (!enabled[i]) {
 379                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 380                                       connector->name);
 381                         conn_configured |= BIT(i);
 382                         continue;
 383                 }
 384
 385                 if (connector->force == DRM_FORCE_OFF) {
 386                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 387                                       connector->name);
 388                         enabled[i] = false;
 389                         continue;
 390                 }
 391
 392                 encoder = connector->state->best_encoder;
 393                 if (!encoder || WARN_ON(!connector->state->crtc)) {
 394                         if (connector->force > DRM_FORCE_OFF)
 395                                 goto bail;
 396
 397                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 398                                       connector->name);
 399                         enabled[i] = false;
 400                         conn_configured |= BIT(i);
 401                         continue;
 402                 }
 403
 404                 num_connectors_enabled++;
 405
 406                 new_crtc = intel_fb_helper_crtc(fb_helper,
 407                                                 connector->state->crtc);
 408
 409                 /*
 410                  * Make sure we're not trying to drive multiple connectors
 411                  * with a single CRTC, since our cloning support may not
 412                  * match the BIOS.
 413                  */
 414                 for (j = 0; j < count; j++) {
 415                         if (crtcs[j] == new_crtc) {
 416                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 417                                 goto bail;
 418                         }
 419                 }
 420
 421                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 422                               connector->name);
 423
 424                 /* go for command line mode first */
 425                 modes[i] = drm_pick_cmdline_mode(fb_conn);
 426
 427                 /* try for preferred next */
 428                 if (!modes[i]) {
 429                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 430                                       connector->name, connector->has_tile);
 431                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 432                                                           height);
 433                 }
 434
 435                 /* No preferred mode marked by the EDID? Are there any modes? */
 436                 if (!modes[i] && !list_empty(&connector->modes)) {
 437                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 438                                       connector->name);
 439                         modes[i] = list_first_entry(&connector->modes,
 440                                                     struct drm_display_mode,
 441                                                     head);
 442                 }
 443
 444                 /* last resort: use current mode */
 445                 if (!modes[i]) {
 446                         /*
 447                          * IMPORTANT: We want to use the adjusted mode (i.e.
 448                          * after the panel fitter upscaling) as the initial
 449                          * config, not the input mode, which is what crtc->mode
 450                          * usually contains. But since our current
 451                          * code puts a mode derived from the post-pfit timings
 452                          * into crtc->mode this works out correctly.
 453                          *
 454                          * This is crtc->mode and not crtc->state->mode for the
 455                          * fastboot check to work correctly. crtc_state->mode has
 456                          * I915_MODE_FLAG_INHERITED, which we clear to force check
 457                          * state.
 458                          */
 459                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 460                                       connector->name);
 461                         modes[i] = &connector->state->crtc->mode;
 462                 }
 463                 crtcs[i] = new_crtc;
 464
 465                 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
 466                               connector->name,
 467                               connector->state->crtc->base.id,
 468                               connector->state->crtc->name,
 469                               modes[i]->hdisplay, modes[i]->vdisplay,
 470                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 471
 472                 fallback = false;
 473                 conn_configured |= BIT(i);
 474         }
 475
 476         if ((conn_configured & mask) != mask && conn_configured != conn_seq)
 477                 goto retry;
 478
 479         /*
 480          * If the BIOS didn't enable everything it could, fall back to have the
 481          * same user experiencing of lighting up as much as possible like the
 482          * fbdev helper library.
 483          */
 484         if (num_connectors_enabled != num_connectors_detected &&
 485             num_connectors_enabled < INTEL_INFO(dev_priv)->num_pipes) {
 486                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 487                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 488                               num_connectors_detected);
 489                 fallback = true;
 490         }
 491
 492         if (fallback) {
 493 bail:
 494                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 495                 memcpy(enabled, save_enabled, count);
 496                 ret = false;
 497         }
 498
 499         drm_modeset_drop_locks(&ctx);
 500         drm_modeset_acquire_fini(&ctx);
 501
 502         kfree(save_enabled);
 503         return ret;
 504 }
 505
 506 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 507         .initial_config = intel_fb_initial_config,
 508         .fb_probe = intelfb_create,
 509 };
 510
 511 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 512 {
 513         /* We rely on the object-free to release the VMA pinning for
 514          * the info->screen_base mmaping. Leaking the VMA is simpler than
 515          * trying to rectify all the possible error paths leading here.
 516          */
 517
 518         drm_fb_helper_fini(&ifbdev->helper);
 519
 520         if (ifbdev->vma) {
 521                 mutex_lock(&ifbdev->helper.dev->struct_mutex);
 522                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 523                 mutex_unlock(&ifbdev->helper.dev->struct_mutex);
 524         }
 525
 526         if (ifbdev->fb)
 527                 drm_framebuffer_remove(&ifbdev->fb->base);
 528
 529         kfree(ifbdev);
 530 }
 531
 532 /*
 533  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 534  * The core display code will have read out the current plane configuration,
 535  * so we use that to figure out if there's an object for us to use as the
 536  * fb, and if so, we re-use it for the fbdev configuration.
 537  *
 538  * Note we only support a single fb shared across pipes for boot (mostly for
 539  * fbcon), so we just find the biggest and use that.
 540  */
 541 static bool intel_fbdev_init_bios(struct drm_device *dev,
 542                                  struct intel_fbdev *ifbdev)
 543 {
 544         struct intel_framebuffer *fb = NULL;
 545         struct drm_crtc *crtc;
 546         struct intel_crtc *intel_crtc;
 547         unsigned int max_size = 0;
 548
 549         /* Find the largest fb */
 550         for_each_crtc(dev, crtc) {
 551                 struct drm_i915_gem_object *obj =
 552                         intel_fb_obj(crtc->primary->state->fb);
 553                 intel_crtc = to_intel_crtc(crtc);
 554
 555                 if (!crtc->state->active || !obj) {
 556                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 557                                       pipe_name(intel_crtc->pipe));
 558                         continue;
 559                 }
 560
 561                 if (obj->base.size > max_size) {
 562                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 563                                       pipe_name(intel_crtc->pipe));
 564                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 565                         max_size = obj->base.size;
 566                 }
 567         }
 568
 569         if (!fb) {
 570                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 571                 goto out;
 572         }
 573
 574         /* Now make sure all the pipes will fit into it */
 575         for_each_crtc(dev, crtc) {
 576                 unsigned int cur_size;
 577
 578                 intel_crtc = to_intel_crtc(crtc);
 579
 580                 if (!crtc->state->active) {
 581                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 582                                       pipe_name(intel_crtc->pipe));
 583                         continue;
 584                 }
 585
 586                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 587                               pipe_name(intel_crtc->pipe));
 588
 589                 /*
 590                  * See if the plane fb we found above will fit on this
 591                  * pipe.  Note we need to use the selected fb's pitch and bpp
 592                  * rather than the current pipe's, since they differ.
 593                  */
 594                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 595                 cur_size = cur_size * fb->base.format->cpp[0];
 596                 if (fb->base.pitches[0] < cur_size) {
 597                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 598                                       pipe_name(intel_crtc->pipe),
 599                                       cur_size, fb->base.pitches[0]);
 600                         fb = NULL;
 601                         break;
 602                 }
 603
 604                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 605                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 606                 cur_size *= fb->base.pitches[0];
 607                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 608                               pipe_name(intel_crtc->pipe),
 609                               intel_crtc->config->base.adjusted_mode.crtc_hdisplay,
 610                               intel_crtc->config->base.adjusted_mode.crtc_vdisplay,
 611                               fb->base.format->cpp[0] * 8,
 612                               cur_size);
 613
 614                 if (cur_size > max_size) {
 615                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 616                                       pipe_name(intel_crtc->pipe),
 617                                       cur_size, max_size);
 618                         fb = NULL;
 619                         break;
 620                 }
 621
 622                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 623                               pipe_name(intel_crtc->pipe),
 624                               max_size, cur_size);
 625         }
 626
 627         if (!fb) {
 628                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 629                 goto out;
 630         }
 631
 632         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 633         ifbdev->fb = fb;
 634
 635         drm_framebuffer_get(&ifbdev->fb->base);
 636
 637         /* Final pass to check if any active pipes don't have fbs */
 638         for_each_crtc(dev, crtc) {
 639                 intel_crtc = to_intel_crtc(crtc);
 640
 641                 if (!crtc->state->active)
 642                         continue;
 643
 644                 WARN(!crtc->primary->state->fb,
 645                      "re-used BIOS config but lost an fb on crtc %d\n",
 646                      crtc->base.id);
 647         }
 648
 649
 650         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 651         return true;
 652
 653 out:
 654
 655         return false;
 656 }
 657
 658 static void intel_fbdev_suspend_worker(struct work_struct *work)
 659 {
 660         intel_fbdev_set_suspend(&container_of(work,
 661                                               struct drm_i915_private,
 662                                               fbdev_suspend_work)->drm,
 663                                 FBINFO_STATE_RUNNING,
 664                                 true);
 665 }
 666
 667 int intel_fbdev_init(struct drm_device *dev)
 668 {
 669         struct drm_i915_private *dev_priv = to_i915(dev);
 670         struct intel_fbdev *ifbdev;
 671         int ret;
 672
 673         if (WARN_ON(INTEL_INFO(dev_priv)->num_pipes == 0))
 674                 return -ENODEV;
 675
 676         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 677         if (ifbdev == NULL)
 678                 return -ENOMEM;
 679
 680         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 681
 682         if (!intel_fbdev_init_bios(dev, ifbdev))
 683                 ifbdev->preferred_bpp = 32;
 684
 685         ret = drm_fb_helper_init(dev, &ifbdev->helper, 4);
 686         if (ret) {
 687                 kfree(ifbdev);
 688                 return ret;
 689         }
 690
 691         dev_priv->fbdev = ifbdev;
 692         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 693
 694         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 695
 696         return 0;
 697 }
 698
 699 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 700 {
 701         struct intel_fbdev *ifbdev = data;
 702
 703         /* Due to peculiar init order wrt to hpd handling this is separate. */
 704         if (drm_fb_helper_initial_config(&ifbdev->helper,
 705                                          ifbdev->preferred_bpp))
 706                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 707 }
 708
 709 void intel_fbdev_initial_config_async(struct drm_device *dev)
 710 {
 711         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 712
 713         if (!ifbdev)
 714                 return;
 715
 716         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 717 }
 718
 719 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 720 {
 721         if (!ifbdev->cookie)
 722                 return;
 723
 724         /* Only serialises with all preceding async calls, hence +1 */
 725         async_synchronize_cookie(ifbdev->cookie + 1);
 726         ifbdev->cookie = 0;
 727 }
 728
 729 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 730 {
 731         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 732
 733         if (!ifbdev)
 734                 return;
 735
 736         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 737         if (!current_is_async())
 738                 intel_fbdev_sync(ifbdev);
 739
 740         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 741 }
 742
 743 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 744 {
 745         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
 746
 747         if (!ifbdev)
 748                 return;
 749
 750         intel_fbdev_destroy(ifbdev);
 751 }
 752
 753 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 754 {
 755         struct drm_i915_private *dev_priv = to_i915(dev);
 756         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 757         struct fb_info *info;
 758
 759         if (!ifbdev || !ifbdev->vma)
 760                 return;
 761
 762         info = ifbdev->helper.fbdev;
 763
 764         if (synchronous) {
 765                 /* Flush any pending work to turn the console on, and then
 766                  * wait to turn it off. It must be synchronous as we are
 767                  * about to suspend or unload the driver.
 768                  *
 769                  * Note that from within the work-handler, we cannot flush
 770                  * ourselves, so only flush outstanding work upon suspend!
 771                  */
 772                 if (state != FBINFO_STATE_RUNNING)
 773                         flush_work(&dev_priv->fbdev_suspend_work);
 774                 console_lock();
 775         } else {
 776                 /*
 777                  * The console lock can be pretty contented on resume due
 778                  * to all the printk activity.  Try to keep it out of the hot
 779                  * path of resume if possible.
 780                  */
 781                 WARN_ON(state != FBINFO_STATE_RUNNING);
 782                 if (!console_trylock()) {
 783                         /* Don't block our own workqueue as this can
 784                          * be run in parallel with other i915.ko tasks.
 785                          */
 786                         schedule_work(&dev_priv->fbdev_suspend_work);
 787                         return;
 788                 }
 789         }
 790
 791         /* On resume from hibernation: If the object is shmemfs backed, it has
 792          * been restored from swap. If the object is stolen however, it will be
 793          * full of whatever garbage was left in there.
 794          */
 795         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 796                 memset_io(info->screen_base, 0, info->screen_size);
 797
 798         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 799         console_unlock();
 800 }
 801
 802 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 803 {
 804         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 805
 806         if (!ifbdev)
 807                 return;
 808
 809         intel_fbdev_sync(ifbdev);
 810         if (ifbdev->vma || ifbdev->helper.deferred_setup)
 811                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 812 }
 813
 814 void intel_fbdev_restore_mode(struct drm_device *dev)
 815 {
 816         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 817
 818         if (!ifbdev)
 819                 return;
 820
 821         intel_fbdev_sync(ifbdev);
 822         if (!ifbdev->vma)
 823                 return;
 824
 825         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 826                 intel_fbdev_invalidate(ifbdev);
 827 }