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