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         info->par = helper;
 239
 240         ifbdev->helper.fb = fb;
 241
 242         strcpy(info->fix.id, "inteldrmfb");
 243
 244         info->fbops = &intelfb_ops;
 245
 246         /* setup aperture base/size for vesafb takeover */
 247         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 248         info->apertures->ranges[0].size = ggtt->mappable_end;
 249
 250         info->fix.smem_start = dev->mode_config.fb_base + i915_ggtt_offset(vma);
 251         info->fix.smem_len = vma->node.size;
 252
 253         vaddr = i915_vma_pin_iomap(vma);
 254         if (IS_ERR(vaddr)) {
 255                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 256                 ret = PTR_ERR(vaddr);
 257                 goto out_unpin;
 258         }
 259         info->screen_base = vaddr;
 260         info->screen_size = vma->node.size;
 261
 262         /* This driver doesn't need a VT switch to restore the mode on resume */
 263         info->skip_vt_switch = true;
 264
 265         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 266         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 267
 268         /* If the object is shmemfs backed, it will have given us zeroed pages.
 269          * If the object is stolen however, it will be full of whatever
 270          * garbage was left in there.
 271          */
 272         if (intel_fb_obj(fb)->stolen && !prealloc)
 273                 memset_io(info->screen_base, 0, info->screen_size);
 274
 275         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 276
 277         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08x\n",
 278                       fb->width, fb->height, i915_ggtt_offset(vma));
 279         ifbdev->vma = vma;
 280         ifbdev->vma_flags = flags;
 281
 282         intel_runtime_pm_put(dev_priv, wakeref);
 283         mutex_unlock(&dev->struct_mutex);
 284         vga_switcheroo_client_fb_set(pdev, info);
 285         return 0;
 286
 287 out_unpin:
 288         intel_unpin_fb_vma(vma, flags);
 289 out_unlock:
 290         intel_runtime_pm_put(dev_priv, wakeref);
 291         mutex_unlock(&dev->struct_mutex);
 292         return ret;
 293 }
 294
 295 static struct drm_fb_helper_crtc *
 296 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 297 {
 298         int i;
 299
 300         for (i = 0; i < fb_helper->crtc_count; i++)
 301                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 302                         return &fb_helper->crtc_info[i];
 303
 304         return NULL;
 305 }
 306
 307 /*
 308  * Try to read the BIOS display configuration and use it for the initial
 309  * fb configuration.
 310  *
 311  * The BIOS or boot loader will generally create an initial display
 312  * configuration for us that includes some set of active pipes and displays.
 313  * This routine tries to figure out which pipes and connectors are active
 314  * and stuffs them into the crtcs and modes array given to us by the
 315  * drm_fb_helper code.
 316  *
 317  * The overall sequence is:
 318  *   intel_fbdev_init - from driver load
 319  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 320  *     drm_fb_helper_init - build fb helper structs
 321  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 322  *   intel_fbdev_initial_config - apply the config
 323  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 324  *         drm_setup_crtcs - build crtc config for fbdev
 325  *           intel_fb_initial_config - find active connectors etc
 326  *         drm_fb_helper_single_fb_probe - set up fbdev
 327  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 328  *
 329  * Note that we don't make special consideration whether we could actually
 330  * switch to the selected modes without a full modeset. E.g. when the display
 331  * is in VGA mode we need to recalculate watermarks and set a new high-res
 332  * framebuffer anyway.
 333  */
 334 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 335                                     struct drm_fb_helper_crtc **crtcs,
 336                                     struct drm_display_mode **modes,
 337                                     struct drm_fb_offset *offsets,
 338                                     bool *enabled, int width, int height)
 339 {
 340         struct drm_i915_private *dev_priv = to_i915(fb_helper->dev);
 341         unsigned long conn_configured, conn_seq, mask;
 342         unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
 343         int i, j;
 344         bool *save_enabled;
 345         bool fallback = true, ret = true;
 346         int num_connectors_enabled = 0;
 347         int num_connectors_detected = 0;
 348         struct drm_modeset_acquire_ctx ctx;
 349
 350         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
 351         if (!save_enabled)
 352                 return false;
 353
 354         drm_modeset_acquire_init(&ctx, 0);
 355
 356         while (drm_modeset_lock_all_ctx(fb_helper->dev, &ctx) != 0)
 357                 drm_modeset_backoff(&ctx);
 358
 359         memcpy(save_enabled, enabled, count);
 360         mask = GENMASK(count - 1, 0);
 361         conn_configured = 0;
 362 retry:
 363         conn_seq = conn_configured;
 364         for (i = 0; i < count; i++) {
 365                 struct drm_fb_helper_connector *fb_conn;
 366                 struct drm_connector *connector;
 367                 struct drm_encoder *encoder;
 368                 struct drm_fb_helper_crtc *new_crtc;
 369
 370                 fb_conn = fb_helper->connector_info[i];
 371                 connector = fb_conn->connector;
 372
 373                 if (conn_configured & BIT(i))
 374                         continue;
 375
 376                 if (conn_seq == 0 && !connector->has_tile)
 377                         continue;
 378
 379                 if (connector->status == connector_status_connected)
 380                         num_connectors_detected++;
 381
 382                 if (!enabled[i]) {
 383                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 384                                       connector->name);
 385                         conn_configured |= BIT(i);
 386                         continue;
 387                 }
 388
 389                 if (connector->force == DRM_FORCE_OFF) {
 390                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 391                                       connector->name);
 392                         enabled[i] = false;
 393                         continue;
 394                 }
 395
 396                 encoder = connector->state->best_encoder;
 397                 if (!encoder || WARN_ON(!connector->state->crtc)) {
 398                         if (connector->force > DRM_FORCE_OFF)
 399                                 goto bail;
 400
 401                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 402                                       connector->name);
 403                         enabled[i] = false;
 404                         conn_configured |= BIT(i);
 405                         continue;
 406                 }
 407
 408                 num_connectors_enabled++;
 409
 410                 new_crtc = intel_fb_helper_crtc(fb_helper,
 411                                                 connector->state->crtc);
 412
 413                 /*
 414                  * Make sure we're not trying to drive multiple connectors
 415                  * with a single CRTC, since our cloning support may not
 416                  * match the BIOS.
 417                  */
 418                 for (j = 0; j < count; j++) {
 419                         if (crtcs[j] == new_crtc) {
 420                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 421                                 goto bail;
 422                         }
 423                 }
 424
 425                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 426                               connector->name);
 427
 428                 /* go for command line mode first */
 429                 modes[i] = drm_pick_cmdline_mode(fb_conn);
 430
 431                 /* try for preferred next */
 432                 if (!modes[i]) {
 433                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 434                                       connector->name, connector->has_tile);
 435                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 436                                                           height);
 437                 }
 438
 439                 /* No preferred mode marked by the EDID? Are there any modes? */
 440                 if (!modes[i] && !list_empty(&connector->modes)) {
 441                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 442                                       connector->name);
 443                         modes[i] = list_first_entry(&connector->modes,
 444                                                     struct drm_display_mode,
 445                                                     head);
 446                 }
 447
 448                 /* last resort: use current mode */
 449                 if (!modes[i]) {
 450                         /*
 451                          * IMPORTANT: We want to use the adjusted mode (i.e.
 452                          * after the panel fitter upscaling) as the initial
 453                          * config, not the input mode, which is what crtc->mode
 454                          * usually contains. But since our current
 455                          * code puts a mode derived from the post-pfit timings
 456                          * into crtc->mode this works out correctly.
 457                          *
 458                          * This is crtc->mode and not crtc->state->mode for the
 459                          * fastboot check to work correctly. crtc_state->mode has
 460                          * I915_MODE_FLAG_INHERITED, which we clear to force check
 461                          * state.
 462                          */
 463                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 464                                       connector->name);
 465                         modes[i] = &connector->state->crtc->mode;
 466                 }
 467                 crtcs[i] = new_crtc;
 468
 469                 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
 470                               connector->name,
 471                               connector->state->crtc->base.id,
 472                               connector->state->crtc->name,
 473                               modes[i]->hdisplay, modes[i]->vdisplay,
 474                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 475
 476                 fallback = false;
 477                 conn_configured |= BIT(i);
 478         }
 479
 480         if ((conn_configured & mask) != mask && conn_configured != conn_seq)
 481                 goto retry;
 482
 483         /*
 484          * If the BIOS didn't enable everything it could, fall back to have the
 485          * same user experiencing of lighting up as much as possible like the
 486          * fbdev helper library.
 487          */
 488         if (num_connectors_enabled != num_connectors_detected &&
 489             num_connectors_enabled < INTEL_INFO(dev_priv)->num_pipes) {
 490                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 491                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 492                               num_connectors_detected);
 493                 fallback = true;
 494         }
 495
 496         if (fallback) {
 497 bail:
 498                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 499                 memcpy(enabled, save_enabled, count);
 500                 ret = false;
 501         }
 502
 503         drm_modeset_drop_locks(&ctx);
 504         drm_modeset_acquire_fini(&ctx);
 505
 506         kfree(save_enabled);
 507         return ret;
 508 }
 509
 510 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 511         .initial_config = intel_fb_initial_config,
 512         .fb_probe = intelfb_create,
 513 };
 514
 515 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 516 {
 517         /* We rely on the object-free to release the VMA pinning for
 518          * the info->screen_base mmaping. Leaking the VMA is simpler than
 519          * trying to rectify all the possible error paths leading here.
 520          */
 521
 522         drm_fb_helper_fini(&ifbdev->helper);
 523
 524         if (ifbdev->vma) {
 525                 mutex_lock(&ifbdev->helper.dev->struct_mutex);
 526                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 527                 mutex_unlock(&ifbdev->helper.dev->struct_mutex);
 528         }
 529
 530         if (ifbdev->fb)
 531                 drm_framebuffer_remove(&ifbdev->fb->base);
 532
 533         kfree(ifbdev);
 534 }
 535
 536 /*
 537  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 538  * The core display code will have read out the current plane configuration,
 539  * so we use that to figure out if there's an object for us to use as the
 540  * fb, and if so, we re-use it for the fbdev configuration.
 541  *
 542  * Note we only support a single fb shared across pipes for boot (mostly for
 543  * fbcon), so we just find the biggest and use that.
 544  */
 545 static bool intel_fbdev_init_bios(struct drm_device *dev,
 546                                  struct intel_fbdev *ifbdev)
 547 {
 548         struct intel_framebuffer *fb = NULL;
 549         struct drm_crtc *crtc;
 550         struct intel_crtc *intel_crtc;
 551         unsigned int max_size = 0;
 552
 553         /* Find the largest fb */
 554         for_each_crtc(dev, crtc) {
 555                 struct drm_i915_gem_object *obj =
 556                         intel_fb_obj(crtc->primary->state->fb);
 557                 intel_crtc = to_intel_crtc(crtc);
 558
 559                 if (!crtc->state->active || !obj) {
 560                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 561                                       pipe_name(intel_crtc->pipe));
 562                         continue;
 563                 }
 564
 565                 if (obj->base.size > max_size) {
 566                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 567                                       pipe_name(intel_crtc->pipe));
 568                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 569                         max_size = obj->base.size;
 570                 }
 571         }
 572
 573         if (!fb) {
 574                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 575                 goto out;
 576         }
 577
 578         /* Now make sure all the pipes will fit into it */
 579         for_each_crtc(dev, crtc) {
 580                 unsigned int cur_size;
 581
 582                 intel_crtc = to_intel_crtc(crtc);
 583
 584                 if (!crtc->state->active) {
 585                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 586                                       pipe_name(intel_crtc->pipe));
 587                         continue;
 588                 }
 589
 590                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 591                               pipe_name(intel_crtc->pipe));
 592
 593                 /*
 594                  * See if the plane fb we found above will fit on this
 595                  * pipe.  Note we need to use the selected fb's pitch and bpp
 596                  * rather than the current pipe's, since they differ.
 597                  */
 598                 cur_size = crtc->state->adjusted_mode.crtc_hdisplay;
 599                 cur_size = cur_size * fb->base.format->cpp[0];
 600                 if (fb->base.pitches[0] < cur_size) {
 601                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 602                                       pipe_name(intel_crtc->pipe),
 603                                       cur_size, fb->base.pitches[0]);
 604                         fb = NULL;
 605                         break;
 606                 }
 607
 608                 cur_size = crtc->state->adjusted_mode.crtc_vdisplay;
 609                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 610                 cur_size *= fb->base.pitches[0];
 611                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 612                               pipe_name(intel_crtc->pipe),
 613                               crtc->state->adjusted_mode.crtc_hdisplay,
 614                               crtc->state->adjusted_mode.crtc_vdisplay,
 615                               fb->base.format->cpp[0] * 8,
 616                               cur_size);
 617
 618                 if (cur_size > max_size) {
 619                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 620                                       pipe_name(intel_crtc->pipe),
 621                                       cur_size, max_size);
 622                         fb = NULL;
 623                         break;
 624                 }
 625
 626                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 627                               pipe_name(intel_crtc->pipe),
 628                               max_size, cur_size);
 629         }
 630
 631         if (!fb) {
 632                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 633                 goto out;
 634         }
 635
 636         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 637         ifbdev->fb = fb;
 638
 639         drm_framebuffer_get(&ifbdev->fb->base);
 640
 641         /* Final pass to check if any active pipes don't have fbs */
 642         for_each_crtc(dev, crtc) {
 643                 intel_crtc = to_intel_crtc(crtc);
 644
 645                 if (!crtc->state->active)
 646                         continue;
 647
 648                 WARN(!crtc->primary->state->fb,
 649                      "re-used BIOS config but lost an fb on crtc %d\n",
 650                      crtc->base.id);
 651         }
 652
 653
 654         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 655         return true;
 656
 657 out:
 658
 659         return false;
 660 }
 661
 662 static void intel_fbdev_suspend_worker(struct work_struct *work)
 663 {
 664         intel_fbdev_set_suspend(&container_of(work,
 665                                               struct drm_i915_private,
 666                                               fbdev_suspend_work)->drm,
 667                                 FBINFO_STATE_RUNNING,
 668                                 true);
 669 }
 670
 671 int intel_fbdev_init(struct drm_device *dev)
 672 {
 673         struct drm_i915_private *dev_priv = to_i915(dev);
 674         struct intel_fbdev *ifbdev;
 675         int ret;
 676
 677         if (WARN_ON(!HAS_DISPLAY(dev_priv)))
 678                 return -ENODEV;
 679
 680         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 681         if (ifbdev == NULL)
 682                 return -ENOMEM;
 683
 684         mutex_init(&ifbdev->hpd_lock);
 685         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 686
 687         if (!intel_fbdev_init_bios(dev, ifbdev))
 688                 ifbdev->preferred_bpp = 32;
 689
 690         ret = drm_fb_helper_init(dev, &ifbdev->helper, 4);
 691         if (ret) {
 692                 kfree(ifbdev);
 693                 return ret;
 694         }
 695
 696         dev_priv->fbdev = ifbdev;
 697         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 698
 699         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 700
 701         return 0;
 702 }
 703
 704 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 705 {
 706         struct intel_fbdev *ifbdev = data;
 707
 708         /* Due to peculiar init order wrt to hpd handling this is separate. */
 709         if (drm_fb_helper_initial_config(&ifbdev->helper,
 710                                          ifbdev->preferred_bpp))
 711                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 712 }
 713
 714 void intel_fbdev_initial_config_async(struct drm_device *dev)
 715 {
 716         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 717
 718         if (!ifbdev)
 719                 return;
 720
 721         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 722 }
 723
 724 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 725 {
 726         if (!ifbdev->cookie)
 727                 return;
 728
 729         /* Only serialises with all preceding async calls, hence +1 */
 730         async_synchronize_cookie(ifbdev->cookie + 1);
 731         ifbdev->cookie = 0;
 732 }
 733
 734 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 735 {
 736         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 737
 738         if (!ifbdev)
 739                 return;
 740
 741         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 742         if (!current_is_async())
 743                 intel_fbdev_sync(ifbdev);
 744
 745         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 746 }
 747
 748 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 749 {
 750         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
 751
 752         if (!ifbdev)
 753                 return;
 754
 755         intel_fbdev_destroy(ifbdev);
 756 }
 757
 758 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 759  * processing, fbdev will perform a full connector reprobe if a hotplug event
 760  * was received while HPD was suspended.
 761  */
 762 static void intel_fbdev_hpd_set_suspend(struct intel_fbdev *ifbdev, int state)
 763 {
 764         bool send_hpd = false;
 765
 766         mutex_lock(&ifbdev->hpd_lock);
 767         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 768         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 769         ifbdev->hpd_waiting = false;
 770         mutex_unlock(&ifbdev->hpd_lock);
 771
 772         if (send_hpd) {
 773                 DRM_DEBUG_KMS("Handling delayed fbcon HPD event\n");
 774                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 775         }
 776 }
 777
 778 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 779 {
 780         struct drm_i915_private *dev_priv = to_i915(dev);
 781         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 782         struct fb_info *info;
 783
 784         if (!ifbdev || !ifbdev->vma)
 785                 return;
 786
 787         info = ifbdev->helper.fbdev;
 788
 789         if (synchronous) {
 790                 /* Flush any pending work to turn the console on, and then
 791                  * wait to turn it off. It must be synchronous as we are
 792                  * about to suspend or unload the driver.
 793                  *
 794                  * Note that from within the work-handler, we cannot flush
 795                  * ourselves, so only flush outstanding work upon suspend!
 796                  */
 797                 if (state != FBINFO_STATE_RUNNING)
 798                         flush_work(&dev_priv->fbdev_suspend_work);
 799
 800                 console_lock();
 801         } else {
 802                 /*
 803                  * The console lock can be pretty contented on resume due
 804                  * to all the printk activity.  Try to keep it out of the hot
 805                  * path of resume if possible.
 806                  */
 807                 WARN_ON(state != FBINFO_STATE_RUNNING);
 808                 if (!console_trylock()) {
 809                         /* Don't block our own workqueue as this can
 810                          * be run in parallel with other i915.ko tasks.
 811                          */
 812                         schedule_work(&dev_priv->fbdev_suspend_work);
 813                         return;
 814                 }
 815         }
 816
 817         /* On resume from hibernation: If the object is shmemfs backed, it has
 818          * been restored from swap. If the object is stolen however, it will be
 819          * full of whatever garbage was left in there.
 820          */
 821         if (state == FBINFO_STATE_RUNNING &&
 822             intel_fb_obj(&ifbdev->fb->base)->stolen)
 823                 memset_io(info->screen_base, 0, info->screen_size);
 824
 825         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 826         console_unlock();
 827
 828         intel_fbdev_hpd_set_suspend(ifbdev, state);
 829 }
 830
 831 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 832 {
 833         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 834         bool send_hpd;
 835
 836         if (!ifbdev)
 837                 return;
 838
 839         intel_fbdev_sync(ifbdev);
 840
 841         mutex_lock(&ifbdev->hpd_lock);
 842         send_hpd = !ifbdev->hpd_suspended;
 843         ifbdev->hpd_waiting = true;
 844         mutex_unlock(&ifbdev->hpd_lock);
 845
 846         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 847                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 848 }
 849
 850 void intel_fbdev_restore_mode(struct drm_device *dev)
 851 {
 852         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 853
 854         if (!ifbdev)
 855                 return;
 856
 857         intel_fbdev_sync(ifbdev);
 858         if (!ifbdev->vma)
 859                 return;
 860
 861         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 862                 intel_fbdev_invalidate(ifbdev);
 863 }