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/drm_crtc.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include <drm/drm_fourcc.h>
  43
  44 #include "intel_drv.h"
  45 #include "intel_frontbuffer.h"
  46 #include <drm/i915_drm.h>
  47 #include "i915_drv.h"
  48
  49 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  50 {
  51         struct drm_i915_gem_object *obj = intel_fb_obj(&ifbdev->fb->base);
  52         unsigned int origin =
  53                 ifbdev->vma_flags & PLANE_HAS_FENCE ? ORIGIN_GTT : ORIGIN_CPU;
  54
  55         intel_fb_obj_invalidate(obj, origin);
  56 }
  57
  58 static int intel_fbdev_set_par(struct fb_info *info)
  59 {
  60         struct drm_fb_helper *fb_helper = info->par;
  61         struct intel_fbdev *ifbdev =
  62                 container_of(fb_helper, struct intel_fbdev, helper);
  63         int ret;
  64
  65         ret = drm_fb_helper_set_par(info);
  66         if (ret == 0)
  67                 intel_fbdev_invalidate(ifbdev);
  68
  69         return ret;
  70 }
  71
  72 static int intel_fbdev_blank(int blank, struct fb_info *info)
  73 {
  74         struct drm_fb_helper *fb_helper = info->par;
  75         struct intel_fbdev *ifbdev =
  76                 container_of(fb_helper, struct intel_fbdev, helper);
  77         int ret;
  78
  79         ret = drm_fb_helper_blank(blank, info);
  80         if (ret == 0)
  81                 intel_fbdev_invalidate(ifbdev);
  82
  83         return ret;
  84 }
  85
  86 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  87                                    struct fb_info *info)
  88 {
  89         struct drm_fb_helper *fb_helper = info->par;
  90         struct intel_fbdev *ifbdev =
  91                 container_of(fb_helper, struct intel_fbdev, helper);
  92         int ret;
  93
  94         ret = drm_fb_helper_pan_display(var, info);
  95         if (ret == 0)
  96                 intel_fbdev_invalidate(ifbdev);
  97
  98         return ret;
  99 }
 100
 101 static struct fb_ops intelfb_ops = {
 102         .owner = THIS_MODULE,
 103         DRM_FB_HELPER_DEFAULT_OPS,
 104         .fb_set_par = intel_fbdev_set_par,
 105         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 106         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 107         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 108         .fb_pan_display = intel_fbdev_pan_display,
 109         .fb_blank = intel_fbdev_blank,
 110 };
 111
 112 static int intelfb_alloc(struct drm_fb_helper *helper,
 113                          struct drm_fb_helper_surface_size *sizes)
 114 {
 115         struct intel_fbdev *ifbdev =
 116                 container_of(helper, struct intel_fbdev, helper);
 117         struct drm_framebuffer *fb;
 118         struct drm_device *dev = helper->dev;
 119         struct drm_i915_private *dev_priv = to_i915(dev);
 120         struct drm_mode_fb_cmd2 mode_cmd = {};
 121         struct drm_i915_gem_object *obj;
 122         int size, ret;
 123
 124         /* we don't do packed 24bpp */
 125         if (sizes->surface_bpp == 24)
 126                 sizes->surface_bpp = 32;
 127
 128         mode_cmd.width = sizes->surface_width;
 129         mode_cmd.height = sizes->surface_height;
 130
 131         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 132                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 133         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 134                                                           sizes->surface_depth);
 135
 136         size = mode_cmd.pitches[0] * mode_cmd.height;
 137         size = PAGE_ALIGN(size);
 138
 139         /* If the FB is too big, just don't use it since fbdev is not very
 140          * important and we should probably use that space with FBC or other
 141          * features. */
 142         obj = NULL;
 143         if (size * 2 < dev_priv->stolen_usable_size)
 144                 obj = i915_gem_object_create_stolen(dev_priv, size);
 145         if (obj == NULL)
 146                 obj = i915_gem_object_create(dev_priv, size);
 147         if (IS_ERR(obj)) {
 148                 DRM_ERROR("failed to allocate framebuffer\n");
 149                 ret = PTR_ERR(obj);
 150                 goto err;
 151         }
 152
 153         fb = intel_framebuffer_create(obj, &mode_cmd);
 154         if (IS_ERR(fb)) {
 155                 ret = PTR_ERR(fb);
 156                 goto err_obj;
 157         }
 158
 159         ifbdev->fb = to_intel_framebuffer(fb);
 160
 161         return 0;
 162
 163 err_obj:
 164         i915_gem_object_put(obj);
 165 err:
 166         return ret;
 167 }
 168
 169 static int intelfb_create(struct drm_fb_helper *helper,
 170                           struct drm_fb_helper_surface_size *sizes)
 171 {
 172         struct intel_fbdev *ifbdev =
 173                 container_of(helper, struct intel_fbdev, helper);
 174         struct intel_framebuffer *intel_fb = ifbdev->fb;
 175         struct drm_device *dev = helper->dev;
 176         struct drm_i915_private *dev_priv = to_i915(dev);
 177         struct pci_dev *pdev = dev_priv->drm.pdev;
 178         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 179         const struct i915_ggtt_view view = {
 180                 .type = I915_GGTT_VIEW_NORMAL,
 181         };
 182         struct drm_framebuffer *fb;
 183         intel_wakeref_t wakeref;
 184         struct fb_info *info;
 185         struct i915_vma *vma;
 186         unsigned long flags = 0;
 187         bool prealloc = false;
 188         void __iomem *vaddr;
 189         int ret;
 190
 191         if (intel_fb &&
 192             (sizes->fb_width > intel_fb->base.width ||
 193              sizes->fb_height > intel_fb->base.height)) {
 194                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 195                               " releasing it\n",
 196                               intel_fb->base.width, intel_fb->base.height,
 197                               sizes->fb_width, sizes->fb_height);
 198                 drm_framebuffer_put(&intel_fb->base);
 199                 intel_fb = ifbdev->fb = NULL;
 200         }
 201         if (!intel_fb || WARN_ON(!intel_fb_obj(&intel_fb->base))) {
 202                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 203                 ret = intelfb_alloc(helper, sizes);
 204                 if (ret)
 205                         return ret;
 206                 intel_fb = ifbdev->fb;
 207         } else {
 208                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 209                 prealloc = true;
 210                 sizes->fb_width = intel_fb->base.width;
 211                 sizes->fb_height = intel_fb->base.height;
 212         }
 213
 214         mutex_lock(&dev->struct_mutex);
 215         wakeref = intel_runtime_pm_get(dev_priv);
 216
 217         /* Pin the GGTT vma for our access via info->screen_base.
 218          * This also validates that any existing fb inherited from the
 219          * BIOS is suitable for own access.
 220          */
 221         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base,
 222                                          &view, false, &flags);
 223         if (IS_ERR(vma)) {
 224                 ret = PTR_ERR(vma);
 225                 goto out_unlock;
 226         }
 227
 228         fb = &ifbdev->fb->base;
 229         intel_fb_obj_flush(intel_fb_obj(fb), ORIGIN_DIRTYFB);
 230
 231         info = drm_fb_helper_alloc_fbi(helper);
 232         if (IS_ERR(info)) {
 233                 DRM_ERROR("Failed to allocate fb_info\n");
 234                 ret = PTR_ERR(info);
 235                 goto out_unpin;
 236         }
 237
 238         ifbdev->helper.fb = fb;
 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         drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 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(fb)->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         ifbdev->vma_flags = flags;
 273
 274         intel_runtime_pm_put(dev_priv, wakeref);
 275         mutex_unlock(&dev->struct_mutex);
 276         vga_switcheroo_client_fb_set(pdev, info);
 277         return 0;
 278
 279 out_unpin:
 280         intel_unpin_fb_vma(vma, flags);
 281 out_unlock:
 282         intel_runtime_pm_put(dev_priv, wakeref);
 283         mutex_unlock(&dev->struct_mutex);
 284         return ret;
 285 }
 286
 287 static struct drm_fb_helper_crtc *
 288 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 289 {
 290         int i;
 291
 292         for (i = 0; i < fb_helper->crtc_count; i++)
 293                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 294                         return &fb_helper->crtc_info[i];
 295
 296         return NULL;
 297 }
 298
 299 /*
 300  * Try to read the BIOS display configuration and use it for the initial
 301  * fb configuration.
 302  *
 303  * The BIOS or boot loader will generally create an initial display
 304  * configuration for us that includes some set of active pipes and displays.
 305  * This routine tries to figure out which pipes and connectors are active
 306  * and stuffs them into the crtcs and modes array given to us by the
 307  * drm_fb_helper code.
 308  *
 309  * The overall sequence is:
 310  *   intel_fbdev_init - from driver load
 311  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 312  *     drm_fb_helper_init - build fb helper structs
 313  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 314  *   intel_fbdev_initial_config - apply the config
 315  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 316  *         drm_setup_crtcs - build crtc config for fbdev
 317  *           intel_fb_initial_config - find active connectors etc
 318  *         drm_fb_helper_single_fb_probe - set up fbdev
 319  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 320  *
 321  * Note that we don't make special consideration whether we could actually
 322  * switch to the selected modes without a full modeset. E.g. when the display
 323  * is in VGA mode we need to recalculate watermarks and set a new high-res
 324  * framebuffer anyway.
 325  */
 326 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 327                                     struct drm_fb_helper_crtc **crtcs,
 328                                     struct drm_display_mode **modes,
 329                                     struct drm_fb_offset *offsets,
 330                                     bool *enabled, int width, int height)
 331 {
 332         struct drm_i915_private *dev_priv = to_i915(fb_helper->dev);
 333         unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
 334         unsigned long conn_configured, conn_seq;
 335         int i, j;
 336         bool *save_enabled;
 337         bool fallback = true, ret = true;
 338         int num_connectors_enabled = 0;
 339         int num_connectors_detected = 0;
 340         struct drm_modeset_acquire_ctx ctx;
 341
 342         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
 343         if (!save_enabled)
 344                 return false;
 345
 346         drm_modeset_acquire_init(&ctx, 0);
 347
 348         while (drm_modeset_lock_all_ctx(fb_helper->dev, &ctx) != 0)
 349                 drm_modeset_backoff(&ctx);
 350
 351         memcpy(save_enabled, enabled, count);
 352         conn_seq = GENMASK(count - 1, 0);
 353         conn_configured = 0;
 354 retry:
 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                 /* First pass, only consider tiled connectors */
 368                 if (conn_seq == GENMASK(count - 1, 0) && !connector->has_tile)
 369                         continue;
 370
 371                 if (connector->status == connector_status_connected)
 372                         num_connectors_detected++;
 373
 374                 if (!enabled[i]) {
 375                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 376                                       connector->name);
 377                         conn_configured |= BIT(i);
 378                         continue;
 379                 }
 380
 381                 if (connector->force == DRM_FORCE_OFF) {
 382                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 383                                       connector->name);
 384                         enabled[i] = false;
 385                         continue;
 386                 }
 387
 388                 encoder = connector->state->best_encoder;
 389                 if (!encoder || WARN_ON(!connector->state->crtc)) {
 390                         if (connector->force > DRM_FORCE_OFF)
 391                                 goto bail;
 392
 393                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 394                                       connector->name);
 395                         enabled[i] = false;
 396                         conn_configured |= BIT(i);
 397                         continue;
 398                 }
 399
 400                 num_connectors_enabled++;
 401
 402                 new_crtc = intel_fb_helper_crtc(fb_helper,
 403                                                 connector->state->crtc);
 404
 405                 /*
 406                  * Make sure we're not trying to drive multiple connectors
 407                  * with a single CRTC, since our cloning support may not
 408                  * match the BIOS.
 409                  */
 410                 for (j = 0; j < count; j++) {
 411                         if (crtcs[j] == new_crtc) {
 412                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 413                                 goto bail;
 414                         }
 415                 }
 416
 417                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 418                               connector->name);
 419
 420                 /* go for command line mode first */
 421                 modes[i] = drm_pick_cmdline_mode(fb_conn);
 422
 423                 /* try for preferred next */
 424                 if (!modes[i]) {
 425                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 426                                       connector->name, connector->has_tile);
 427                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 428                                                           height);
 429                 }
 430
 431                 /* No preferred mode marked by the EDID? Are there any modes? */
 432                 if (!modes[i] && !list_empty(&connector->modes)) {
 433                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 434                                       connector->name);
 435                         modes[i] = list_first_entry(&connector->modes,
 436                                                     struct drm_display_mode,
 437                                                     head);
 438                 }
 439
 440                 /* last resort: use current mode */
 441                 if (!modes[i]) {
 442                         /*
 443                          * IMPORTANT: We want to use the adjusted mode (i.e.
 444                          * after the panel fitter upscaling) as the initial
 445                          * config, not the input mode, which is what crtc->mode
 446                          * usually contains. But since our current
 447                          * code puts a mode derived from the post-pfit timings
 448                          * into crtc->mode this works out correctly.
 449                          *
 450                          * This is crtc->mode and not crtc->state->mode for the
 451                          * fastboot check to work correctly. crtc_state->mode has
 452                          * I915_MODE_FLAG_INHERITED, which we clear to force check
 453                          * state.
 454                          */
 455                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 456                                       connector->name);
 457                         modes[i] = &connector->state->crtc->mode;
 458                 }
 459                 crtcs[i] = new_crtc;
 460
 461                 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
 462                               connector->name,
 463                               connector->state->crtc->base.id,
 464                               connector->state->crtc->name,
 465                               modes[i]->hdisplay, modes[i]->vdisplay,
 466                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 467
 468                 fallback = false;
 469                 conn_configured |= BIT(i);
 470         }
 471
 472         if (conn_configured != conn_seq) { /* repeat until no more are found */
 473                 conn_seq = conn_configured;
 474                 goto retry;
 475         }
 476
 477         /*
 478          * If the BIOS didn't enable everything it could, fall back to have the
 479          * same user experiencing of lighting up as much as possible like the
 480          * fbdev helper library.
 481          */
 482         if (num_connectors_enabled != num_connectors_detected &&
 483             num_connectors_enabled < INTEL_INFO(dev_priv)->num_pipes) {
 484                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 485                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 486                               num_connectors_detected);
 487                 fallback = true;
 488         }
 489
 490         if (fallback) {
 491 bail:
 492                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 493                 memcpy(enabled, save_enabled, count);
 494                 ret = false;
 495         }
 496
 497         drm_modeset_drop_locks(&ctx);
 498         drm_modeset_acquire_fini(&ctx);
 499
 500         kfree(save_enabled);
 501         return ret;
 502 }
 503
 504 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 505         .initial_config = intel_fb_initial_config,
 506         .fb_probe = intelfb_create,
 507 };
 508
 509 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 510 {
 511         /* We rely on the object-free to release the VMA pinning for
 512          * the info->screen_base mmaping. Leaking the VMA is simpler than
 513          * trying to rectify all the possible error paths leading here.
 514          */
 515
 516         drm_fb_helper_fini(&ifbdev->helper);
 517
 518         if (ifbdev->vma) {
 519                 mutex_lock(&ifbdev->helper.dev->struct_mutex);
 520                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 521                 mutex_unlock(&ifbdev->helper.dev->struct_mutex);
 522         }
 523
 524         if (ifbdev->fb)
 525                 drm_framebuffer_remove(&ifbdev->fb->base);
 526
 527         kfree(ifbdev);
 528 }
 529
 530 /*
 531  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 532  * The core display code will have read out the current plane configuration,
 533  * so we use that to figure out if there's an object for us to use as the
 534  * fb, and if so, we re-use it for the fbdev configuration.
 535  *
 536  * Note we only support a single fb shared across pipes for boot (mostly for
 537  * fbcon), so we just find the biggest and use that.
 538  */
 539 static bool intel_fbdev_init_bios(struct drm_device *dev,
 540                                  struct intel_fbdev *ifbdev)
 541 {
 542         struct intel_framebuffer *fb = NULL;
 543         struct drm_crtc *crtc;
 544         struct intel_crtc *intel_crtc;
 545         unsigned int max_size = 0;
 546
 547         /* Find the largest fb */
 548         for_each_crtc(dev, crtc) {
 549                 struct drm_i915_gem_object *obj =
 550                         intel_fb_obj(crtc->primary->state->fb);
 551                 intel_crtc = to_intel_crtc(crtc);
 552
 553                 if (!crtc->state->active || !obj) {
 554                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 555                                       pipe_name(intel_crtc->pipe));
 556                         continue;
 557                 }
 558
 559                 if (obj->base.size > max_size) {
 560                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 561                                       pipe_name(intel_crtc->pipe));
 562                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 563                         max_size = obj->base.size;
 564                 }
 565         }
 566
 567         if (!fb) {
 568                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 569                 goto out;
 570         }
 571
 572         /* Now make sure all the pipes will fit into it */
 573         for_each_crtc(dev, crtc) {
 574                 unsigned int cur_size;
 575
 576                 intel_crtc = to_intel_crtc(crtc);
 577
 578                 if (!crtc->state->active) {
 579                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 580                                       pipe_name(intel_crtc->pipe));
 581                         continue;
 582                 }
 583
 584                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 585                               pipe_name(intel_crtc->pipe));
 586
 587                 /*
 588                  * See if the plane fb we found above will fit on this
 589                  * pipe.  Note we need to use the selected fb's pitch and bpp
 590                  * rather than the current pipe's, since they differ.
 591                  */
 592                 cur_size = crtc->state->adjusted_mode.crtc_hdisplay;
 593                 cur_size = cur_size * fb->base.format->cpp[0];
 594                 if (fb->base.pitches[0] < cur_size) {
 595                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 596                                       pipe_name(intel_crtc->pipe),
 597                                       cur_size, fb->base.pitches[0]);
 598                         fb = NULL;
 599                         break;
 600                 }
 601
 602                 cur_size = crtc->state->adjusted_mode.crtc_vdisplay;
 603                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 604                 cur_size *= fb->base.pitches[0];
 605                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 606                               pipe_name(intel_crtc->pipe),
 607                               crtc->state->adjusted_mode.crtc_hdisplay,
 608                               crtc->state->adjusted_mode.crtc_vdisplay,
 609                               fb->base.format->cpp[0] * 8,
 610                               cur_size);
 611
 612                 if (cur_size > max_size) {
 613                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 614                                       pipe_name(intel_crtc->pipe),
 615                                       cur_size, max_size);
 616                         fb = NULL;
 617                         break;
 618                 }
 619
 620                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 621                               pipe_name(intel_crtc->pipe),
 622                               max_size, cur_size);
 623         }
 624
 625         if (!fb) {
 626                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 627                 goto out;
 628         }
 629
 630         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 631         ifbdev->fb = fb;
 632
 633         drm_framebuffer_get(&ifbdev->fb->base);
 634
 635         /* Final pass to check if any active pipes don't have fbs */
 636         for_each_crtc(dev, crtc) {
 637                 intel_crtc = to_intel_crtc(crtc);
 638
 639                 if (!crtc->state->active)
 640                         continue;
 641
 642                 WARN(!crtc->primary->state->fb,
 643                      "re-used BIOS config but lost an fb on crtc %d\n",
 644                      crtc->base.id);
 645         }
 646
 647
 648         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 649         return true;
 650
 651 out:
 652
 653         return false;
 654 }
 655
 656 static void intel_fbdev_suspend_worker(struct work_struct *work)
 657 {
 658         intel_fbdev_set_suspend(&container_of(work,
 659                                               struct drm_i915_private,
 660                                               fbdev_suspend_work)->drm,
 661                                 FBINFO_STATE_RUNNING,
 662                                 true);
 663 }
 664
 665 int intel_fbdev_init(struct drm_device *dev)
 666 {
 667         struct drm_i915_private *dev_priv = to_i915(dev);
 668         struct intel_fbdev *ifbdev;
 669         int ret;
 670
 671         if (WARN_ON(!HAS_DISPLAY(dev_priv)))
 672                 return -ENODEV;
 673
 674         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 675         if (ifbdev == NULL)
 676                 return -ENOMEM;
 677
 678         mutex_init(&ifbdev->hpd_lock);
 679         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 680
 681         if (!intel_fbdev_init_bios(dev, ifbdev))
 682                 ifbdev->preferred_bpp = 32;
 683
 684         ret = drm_fb_helper_init(dev, &ifbdev->helper, 4);
 685         if (ret) {
 686                 kfree(ifbdev);
 687                 return ret;
 688         }
 689
 690         dev_priv->fbdev = ifbdev;
 691         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 692
 693         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 694
 695         return 0;
 696 }
 697
 698 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 699 {
 700         struct intel_fbdev *ifbdev = data;
 701
 702         /* Due to peculiar init order wrt to hpd handling this is separate. */
 703         if (drm_fb_helper_initial_config(&ifbdev->helper,
 704                                          ifbdev->preferred_bpp))
 705                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 706 }
 707
 708 void intel_fbdev_initial_config_async(struct drm_device *dev)
 709 {
 710         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 711
 712         if (!ifbdev)
 713                 return;
 714
 715         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 716 }
 717
 718 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 719 {
 720         if (!ifbdev->cookie)
 721                 return;
 722
 723         /* Only serialises with all preceding async calls, hence +1 */
 724         async_synchronize_cookie(ifbdev->cookie + 1);
 725         ifbdev->cookie = 0;
 726 }
 727
 728 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 729 {
 730         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 731
 732         if (!ifbdev)
 733                 return;
 734
 735         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 736         if (!current_is_async())
 737                 intel_fbdev_sync(ifbdev);
 738
 739         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 740 }
 741
 742 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 743 {
 744         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
 745
 746         if (!ifbdev)
 747                 return;
 748
 749         intel_fbdev_destroy(ifbdev);
 750 }
 751
 752 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 753  * processing, fbdev will perform a full connector reprobe if a hotplug event
 754  * was received while HPD was suspended.
 755  */
 756 static void intel_fbdev_hpd_set_suspend(struct intel_fbdev *ifbdev, int state)
 757 {
 758         bool send_hpd = false;
 759
 760         mutex_lock(&ifbdev->hpd_lock);
 761         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 762         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 763         ifbdev->hpd_waiting = false;
 764         mutex_unlock(&ifbdev->hpd_lock);
 765
 766         if (send_hpd) {
 767                 DRM_DEBUG_KMS("Handling delayed fbcon HPD event\n");
 768                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 769         }
 770 }
 771
 772 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 773 {
 774         struct drm_i915_private *dev_priv = to_i915(dev);
 775         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 776         struct fb_info *info;
 777
 778         if (!ifbdev || !ifbdev->vma)
 779                 return;
 780
 781         info = ifbdev->helper.fbdev;
 782
 783         if (synchronous) {
 784                 /* Flush any pending work to turn the console on, and then
 785                  * wait to turn it off. It must be synchronous as we are
 786                  * about to suspend or unload the driver.
 787                  *
 788                  * Note that from within the work-handler, we cannot flush
 789                  * ourselves, so only flush outstanding work upon suspend!
 790                  */
 791                 if (state != FBINFO_STATE_RUNNING)
 792                         flush_work(&dev_priv->fbdev_suspend_work);
 793
 794                 console_lock();
 795         } else {
 796                 /*
 797                  * The console lock can be pretty contented on resume due
 798                  * to all the printk activity.  Try to keep it out of the hot
 799                  * path of resume if possible.
 800                  */
 801                 WARN_ON(state != FBINFO_STATE_RUNNING);
 802                 if (!console_trylock()) {
 803                         /* Don't block our own workqueue as this can
 804                          * be run in parallel with other i915.ko tasks.
 805                          */
 806                         schedule_work(&dev_priv->fbdev_suspend_work);
 807                         return;
 808                 }
 809         }
 810
 811         /* On resume from hibernation: If the object is shmemfs backed, it has
 812          * been restored from swap. If the object is stolen however, it will be
 813          * full of whatever garbage was left in there.
 814          */
 815         if (state == FBINFO_STATE_RUNNING &&
 816             intel_fb_obj(&ifbdev->fb->base)->stolen)
 817                 memset_io(info->screen_base, 0, info->screen_size);
 818
 819         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 820         console_unlock();
 821
 822         intel_fbdev_hpd_set_suspend(ifbdev, state);
 823 }
 824
 825 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 826 {
 827         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 828         bool send_hpd;
 829
 830         if (!ifbdev)
 831                 return;
 832
 833         intel_fbdev_sync(ifbdev);
 834
 835         mutex_lock(&ifbdev->hpd_lock);
 836         send_hpd = !ifbdev->hpd_suspended;
 837         ifbdev->hpd_waiting = true;
 838         mutex_unlock(&ifbdev->hpd_lock);
 839
 840         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 841                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 842 }
 843
 844 void intel_fbdev_restore_mode(struct drm_device *dev)
 845 {
 846         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 847
 848         if (!ifbdev)
 849                 return;
 850
 851         intel_fbdev_sync(ifbdev);
 852         if (!ifbdev->vma)
 853                 return;
 854
 855         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 856                 intel_fbdev_invalidate(ifbdev);
 857 }