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/console.h>
  29 #include <linux/delay.h>
  30 #include <linux/errno.h>
  31 #include <linux/init.h>
  32 #include <linux/kernel.h>
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/string.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/tty.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 #include <drm/i915_drm.h>
  44
  45 #include "i915_drv.h"
  46 #include "intel_drv.h"
  47 #include "intel_fbdev.h"
  48 #include "intel_frontbuffer.h"
  49
  50 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  51 {
  52         struct drm_i915_gem_object *obj = intel_fb_obj(&ifbdev->fb->base);
  53         unsigned int origin =
  54                 ifbdev->vma_flags & PLANE_HAS_FENCE ? ORIGIN_GTT : ORIGIN_CPU;
  55
  56         intel_fb_obj_invalidate(obj, origin);
  57 }
  58
  59 static int intel_fbdev_set_par(struct fb_info *info)
  60 {
  61         struct drm_fb_helper *fb_helper = info->par;
  62         struct intel_fbdev *ifbdev =
  63                 container_of(fb_helper, struct intel_fbdev, helper);
  64         int ret;
  65
  66         ret = drm_fb_helper_set_par(info);
  67         if (ret == 0)
  68                 intel_fbdev_invalidate(ifbdev);
  69
  70         return ret;
  71 }
  72
  73 static int intel_fbdev_blank(int blank, struct fb_info *info)
  74 {
  75         struct drm_fb_helper *fb_helper = info->par;
  76         struct intel_fbdev *ifbdev =
  77                 container_of(fb_helper, struct intel_fbdev, helper);
  78         int ret;
  79
  80         ret = drm_fb_helper_blank(blank, info);
  81         if (ret == 0)
  82                 intel_fbdev_invalidate(ifbdev);
  83
  84         return ret;
  85 }
  86
  87 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  88                                    struct fb_info *info)
  89 {
  90         struct drm_fb_helper *fb_helper = info->par;
  91         struct intel_fbdev *ifbdev =
  92                 container_of(fb_helper, struct intel_fbdev, helper);
  93         int ret;
  94
  95         ret = drm_fb_helper_pan_display(var, info);
  96         if (ret == 0)
  97                 intel_fbdev_invalidate(ifbdev);
  98
  99         return ret;
 100 }
 101
 102 static struct fb_ops intelfb_ops = {
 103         .owner = THIS_MODULE,
 104         DRM_FB_HELPER_DEFAULT_OPS,
 105         .fb_set_par = intel_fbdev_set_par,
 106         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 107         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 108         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 109         .fb_pan_display = intel_fbdev_pan_display,
 110         .fb_blank = intel_fbdev_blank,
 111 };
 112
 113 static int intelfb_alloc(struct drm_fb_helper *helper,
 114                          struct drm_fb_helper_surface_size *sizes)
 115 {
 116         struct intel_fbdev *ifbdev =
 117                 container_of(helper, struct intel_fbdev, helper);
 118         struct drm_framebuffer *fb;
 119         struct drm_device *dev = helper->dev;
 120         struct drm_i915_private *dev_priv = to_i915(dev);
 121         struct drm_mode_fb_cmd2 mode_cmd = {};
 122         struct drm_i915_gem_object *obj;
 123         int size, ret;
 124
 125         /* we don't do packed 24bpp */
 126         if (sizes->surface_bpp == 24)
 127                 sizes->surface_bpp = 32;
 128
 129         mode_cmd.width = sizes->surface_width;
 130         mode_cmd.height = sizes->surface_height;
 131
 132         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 133                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 134         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 135                                                           sizes->surface_depth);
 136
 137         size = mode_cmd.pitches[0] * mode_cmd.height;
 138         size = PAGE_ALIGN(size);
 139
 140         /* If the FB is too big, just don't use it since fbdev is not very
 141          * important and we should probably use that space with FBC or other
 142          * features. */
 143         obj = NULL;
 144         if (size * 2 < dev_priv->stolen_usable_size)
 145                 obj = i915_gem_object_create_stolen(dev_priv, size);
 146         if (obj == NULL)
 147                 obj = i915_gem_object_create(dev_priv, size);
 148         if (IS_ERR(obj)) {
 149                 DRM_ERROR("failed to allocate framebuffer\n");
 150                 ret = PTR_ERR(obj);
 151                 goto err;
 152         }
 153
 154         fb = intel_framebuffer_create(obj, &mode_cmd);
 155         if (IS_ERR(fb)) {
 156                 ret = PTR_ERR(fb);
 157                 goto err_obj;
 158         }
 159
 160         ifbdev->fb = to_intel_framebuffer(fb);
 161
 162         return 0;
 163
 164 err_obj:
 165         i915_gem_object_put(obj);
 166 err:
 167         return ret;
 168 }
 169
 170 static int intelfb_create(struct drm_fb_helper *helper,
 171                           struct drm_fb_helper_surface_size *sizes)
 172 {
 173         struct intel_fbdev *ifbdev =
 174                 container_of(helper, struct intel_fbdev, helper);
 175         struct intel_framebuffer *intel_fb = ifbdev->fb;
 176         struct drm_device *dev = helper->dev;
 177         struct drm_i915_private *dev_priv = to_i915(dev);
 178         struct pci_dev *pdev = dev_priv->drm.pdev;
 179         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 180         const struct i915_ggtt_view view = {
 181                 .type = I915_GGTT_VIEW_NORMAL,
 182         };
 183         struct drm_framebuffer *fb;
 184         intel_wakeref_t wakeref;
 185         struct fb_info *info;
 186         struct i915_vma *vma;
 187         unsigned long flags = 0;
 188         bool prealloc = false;
 189         void __iomem *vaddr;
 190         int ret;
 191
 192         if (intel_fb &&
 193             (sizes->fb_width > intel_fb->base.width ||
 194              sizes->fb_height > intel_fb->base.height)) {
 195                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 196                               " releasing it\n",
 197                               intel_fb->base.width, intel_fb->base.height,
 198                               sizes->fb_width, sizes->fb_height);
 199                 drm_framebuffer_put(&intel_fb->base);
 200                 intel_fb = ifbdev->fb = NULL;
 201         }
 202         if (!intel_fb || WARN_ON(!intel_fb_obj(&intel_fb->base))) {
 203                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 204                 ret = intelfb_alloc(helper, sizes);
 205                 if (ret)
 206                         return ret;
 207                 intel_fb = ifbdev->fb;
 208         } else {
 209                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 210                 prealloc = true;
 211                 sizes->fb_width = intel_fb->base.width;
 212                 sizes->fb_height = intel_fb->base.height;
 213         }
 214
 215         mutex_lock(&dev->struct_mutex);
 216         wakeref = intel_runtime_pm_get(dev_priv);
 217
 218         /* Pin the GGTT vma for our access via info->screen_base.
 219          * This also validates that any existing fb inherited from the
 220          * BIOS is suitable for own access.
 221          */
 222         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base,
 223                                          &view, false, &flags);
 224         if (IS_ERR(vma)) {
 225                 ret = PTR_ERR(vma);
 226                 goto out_unlock;
 227         }
 228
 229         fb = &ifbdev->fb->base;
 230         intel_fb_obj_flush(intel_fb_obj(fb), ORIGIN_DIRTYFB);
 231
 232         info = drm_fb_helper_alloc_fbi(helper);
 233         if (IS_ERR(info)) {
 234                 DRM_ERROR("Failed to allocate fb_info\n");
 235                 ret = PTR_ERR(info);
 236                 goto out_unpin;
 237         }
 238
 239         ifbdev->helper.fb = fb;
 240
 241         info->fbops = &intelfb_ops;
 242
 243         /* setup aperture base/size for vesafb takeover */
 244         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 245         info->apertures->ranges[0].size = ggtt->mappable_end;
 246
 247         info->fix.smem_start = dev->mode_config.fb_base + i915_ggtt_offset(vma);
 248         info->fix.smem_len = vma->node.size;
 249
 250         vaddr = i915_vma_pin_iomap(vma);
 251         if (IS_ERR(vaddr)) {
 252                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 253                 ret = PTR_ERR(vaddr);
 254                 goto out_unpin;
 255         }
 256         info->screen_base = vaddr;
 257         info->screen_size = vma->node.size;
 258
 259         drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 260
 261         /* If the object is shmemfs backed, it will have given us zeroed pages.
 262          * If the object is stolen however, it will be full of whatever
 263          * garbage was left in there.
 264          */
 265         if (intel_fb_obj(fb)->stolen && !prealloc)
 266                 memset_io(info->screen_base, 0, info->screen_size);
 267
 268         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 269
 270         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08x\n",
 271                       fb->width, fb->height, i915_ggtt_offset(vma));
 272         ifbdev->vma = vma;
 273         ifbdev->vma_flags = flags;
 274
 275         intel_runtime_pm_put(dev_priv, wakeref);
 276         mutex_unlock(&dev->struct_mutex);
 277         vga_switcheroo_client_fb_set(pdev, info);
 278         return 0;
 279
 280 out_unpin:
 281         intel_unpin_fb_vma(vma, flags);
 282 out_unlock:
 283         intel_runtime_pm_put(dev_priv, wakeref);
 284         mutex_unlock(&dev->struct_mutex);
 285         return ret;
 286 }
 287
 288 static struct drm_fb_helper_crtc *
 289 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 290 {
 291         int i;
 292
 293         for (i = 0; i < fb_helper->crtc_count; i++)
 294                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 295                         return &fb_helper->crtc_info[i];
 296
 297         return NULL;
 298 }
 299
 300 /*
 301  * Try to read the BIOS display configuration and use it for the initial
 302  * fb configuration.
 303  *
 304  * The BIOS or boot loader will generally create an initial display
 305  * configuration for us that includes some set of active pipes and displays.
 306  * This routine tries to figure out which pipes and connectors are active
 307  * and stuffs them into the crtcs and modes array given to us by the
 308  * drm_fb_helper code.
 309  *
 310  * The overall sequence is:
 311  *   intel_fbdev_init - from driver load
 312  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 313  *     drm_fb_helper_init - build fb helper structs
 314  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 315  *   intel_fbdev_initial_config - apply the config
 316  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 317  *         drm_setup_crtcs - build crtc config for fbdev
 318  *           intel_fb_initial_config - find active connectors etc
 319  *         drm_fb_helper_single_fb_probe - set up fbdev
 320  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 321  *
 322  * Note that we don't make special consideration whether we could actually
 323  * switch to the selected modes without a full modeset. E.g. when the display
 324  * is in VGA mode we need to recalculate watermarks and set a new high-res
 325  * framebuffer anyway.
 326  */
 327 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 328                                     struct drm_fb_helper_crtc **crtcs,
 329                                     struct drm_display_mode **modes,
 330                                     struct drm_fb_offset *offsets,
 331                                     bool *enabled, int width, int height)
 332 {
 333         struct drm_i915_private *dev_priv = to_i915(fb_helper->dev);
 334         unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
 335         unsigned long conn_configured, conn_seq;
 336         int i, j;
 337         bool *save_enabled;
 338         bool fallback = true, ret = true;
 339         int num_connectors_enabled = 0;
 340         int num_connectors_detected = 0;
 341         struct drm_modeset_acquire_ctx ctx;
 342
 343         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
 344         if (!save_enabled)
 345                 return false;
 346
 347         drm_modeset_acquire_init(&ctx, 0);
 348
 349         while (drm_modeset_lock_all_ctx(fb_helper->dev, &ctx) != 0)
 350                 drm_modeset_backoff(&ctx);
 351
 352         memcpy(save_enabled, enabled, count);
 353         conn_seq = GENMASK(count - 1, 0);
 354         conn_configured = 0;
 355 retry:
 356         for (i = 0; i < count; i++) {
 357                 struct drm_fb_helper_connector *fb_conn;
 358                 struct drm_connector *connector;
 359                 struct drm_encoder *encoder;
 360                 struct drm_fb_helper_crtc *new_crtc;
 361
 362                 fb_conn = fb_helper->connector_info[i];
 363                 connector = fb_conn->connector;
 364
 365                 if (conn_configured & BIT(i))
 366                         continue;
 367
 368                 /* First pass, only consider tiled connectors */
 369                 if (conn_seq == GENMASK(count - 1, 0) && !connector->has_tile)
 370                         continue;
 371
 372                 if (connector->status == connector_status_connected)
 373                         num_connectors_detected++;
 374
 375                 if (!enabled[i]) {
 376                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 377                                       connector->name);
 378                         conn_configured |= BIT(i);
 379                         continue;
 380                 }
 381
 382                 if (connector->force == DRM_FORCE_OFF) {
 383                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 384                                       connector->name);
 385                         enabled[i] = false;
 386                         continue;
 387                 }
 388
 389                 encoder = connector->state->best_encoder;
 390                 if (!encoder || WARN_ON(!connector->state->crtc)) {
 391                         if (connector->force > DRM_FORCE_OFF)
 392                                 goto bail;
 393
 394                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 395                                       connector->name);
 396                         enabled[i] = false;
 397                         conn_configured |= BIT(i);
 398                         continue;
 399                 }
 400
 401                 num_connectors_enabled++;
 402
 403                 new_crtc = intel_fb_helper_crtc(fb_helper,
 404                                                 connector->state->crtc);
 405
 406                 /*
 407                  * Make sure we're not trying to drive multiple connectors
 408                  * with a single CRTC, since our cloning support may not
 409                  * match the BIOS.
 410                  */
 411                 for (j = 0; j < count; j++) {
 412                         if (crtcs[j] == new_crtc) {
 413                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 414                                 goto bail;
 415                         }
 416                 }
 417
 418                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 419                               connector->name);
 420
 421                 /* go for command line mode first */
 422                 modes[i] = drm_pick_cmdline_mode(fb_conn);
 423
 424                 /* try for preferred next */
 425                 if (!modes[i]) {
 426                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 427                                       connector->name, connector->has_tile);
 428                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 429                                                           height);
 430                 }
 431
 432                 /* No preferred mode marked by the EDID? Are there any modes? */
 433                 if (!modes[i] && !list_empty(&connector->modes)) {
 434                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 435                                       connector->name);
 436                         modes[i] = list_first_entry(&connector->modes,
 437                                                     struct drm_display_mode,
 438                                                     head);
 439                 }
 440
 441                 /* last resort: use current mode */
 442                 if (!modes[i]) {
 443                         /*
 444                          * IMPORTANT: We want to use the adjusted mode (i.e.
 445                          * after the panel fitter upscaling) as the initial
 446                          * config, not the input mode, which is what crtc->mode
 447                          * usually contains. But since our current
 448                          * code puts a mode derived from the post-pfit timings
 449                          * into crtc->mode this works out correctly.
 450                          *
 451                          * This is crtc->mode and not crtc->state->mode for the
 452                          * fastboot check to work correctly. crtc_state->mode has
 453                          * I915_MODE_FLAG_INHERITED, which we clear to force check
 454                          * state.
 455                          */
 456                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 457                                       connector->name);
 458                         modes[i] = &connector->state->crtc->mode;
 459                 }
 460                 crtcs[i] = new_crtc;
 461
 462                 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
 463                               connector->name,
 464                               connector->state->crtc->base.id,
 465                               connector->state->crtc->name,
 466                               modes[i]->hdisplay, modes[i]->vdisplay,
 467                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 468
 469                 fallback = false;
 470                 conn_configured |= BIT(i);
 471         }
 472
 473         if (conn_configured != conn_seq) { /* repeat until no more are found */
 474                 conn_seq = conn_configured;
 475                 goto retry;
 476         }
 477
 478         /*
 479          * If the BIOS didn't enable everything it could, fall back to have the
 480          * same user experiencing of lighting up as much as possible like the
 481          * fbdev helper library.
 482          */
 483         if (num_connectors_enabled != num_connectors_detected &&
 484             num_connectors_enabled < INTEL_INFO(dev_priv)->num_pipes) {
 485                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 486                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 487                               num_connectors_detected);
 488                 fallback = true;
 489         }
 490
 491         if (fallback) {
 492 bail:
 493                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 494                 memcpy(enabled, save_enabled, count);
 495                 ret = false;
 496         }
 497
 498         drm_modeset_drop_locks(&ctx);
 499         drm_modeset_acquire_fini(&ctx);
 500
 501         kfree(save_enabled);
 502         return ret;
 503 }
 504
 505 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 506         .initial_config = intel_fb_initial_config,
 507         .fb_probe = intelfb_create,
 508 };
 509
 510 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 511 {
 512         /* We rely on the object-free to release the VMA pinning for
 513          * the info->screen_base mmaping. Leaking the VMA is simpler than
 514          * trying to rectify all the possible error paths leading here.
 515          */
 516
 517         drm_fb_helper_fini(&ifbdev->helper);
 518
 519         if (ifbdev->vma) {
 520                 mutex_lock(&ifbdev->helper.dev->struct_mutex);
 521                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 522                 mutex_unlock(&ifbdev->helper.dev->struct_mutex);
 523         }
 524
 525         if (ifbdev->fb)
 526                 drm_framebuffer_remove(&ifbdev->fb->base);
 527
 528         kfree(ifbdev);
 529 }
 530
 531 /*
 532  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 533  * The core display code will have read out the current plane configuration,
 534  * so we use that to figure out if there's an object for us to use as the
 535  * fb, and if so, we re-use it for the fbdev configuration.
 536  *
 537  * Note we only support a single fb shared across pipes for boot (mostly for
 538  * fbcon), so we just find the biggest and use that.
 539  */
 540 static bool intel_fbdev_init_bios(struct drm_device *dev,
 541                                  struct intel_fbdev *ifbdev)
 542 {
 543         struct intel_framebuffer *fb = NULL;
 544         struct drm_crtc *crtc;
 545         struct intel_crtc *intel_crtc;
 546         unsigned int max_size = 0;
 547
 548         /* Find the largest fb */
 549         for_each_crtc(dev, crtc) {
 550                 struct drm_i915_gem_object *obj =
 551                         intel_fb_obj(crtc->primary->state->fb);
 552                 intel_crtc = to_intel_crtc(crtc);
 553
 554                 if (!crtc->state->active || !obj) {
 555                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 556                                       pipe_name(intel_crtc->pipe));
 557                         continue;
 558                 }
 559
 560                 if (obj->base.size > max_size) {
 561                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 562                                       pipe_name(intel_crtc->pipe));
 563                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 564                         max_size = obj->base.size;
 565                 }
 566         }
 567
 568         if (!fb) {
 569                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 570                 goto out;
 571         }
 572
 573         /* Now make sure all the pipes will fit into it */
 574         for_each_crtc(dev, crtc) {
 575                 unsigned int cur_size;
 576
 577                 intel_crtc = to_intel_crtc(crtc);
 578
 579                 if (!crtc->state->active) {
 580                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 581                                       pipe_name(intel_crtc->pipe));
 582                         continue;
 583                 }
 584
 585                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 586                               pipe_name(intel_crtc->pipe));
 587
 588                 /*
 589                  * See if the plane fb we found above will fit on this
 590                  * pipe.  Note we need to use the selected fb's pitch and bpp
 591                  * rather than the current pipe's, since they differ.
 592                  */
 593                 cur_size = crtc->state->adjusted_mode.crtc_hdisplay;
 594                 cur_size = cur_size * fb->base.format->cpp[0];
 595                 if (fb->base.pitches[0] < cur_size) {
 596                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 597                                       pipe_name(intel_crtc->pipe),
 598                                       cur_size, fb->base.pitches[0]);
 599                         fb = NULL;
 600                         break;
 601                 }
 602
 603                 cur_size = crtc->state->adjusted_mode.crtc_vdisplay;
 604                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 605                 cur_size *= fb->base.pitches[0];
 606                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 607                               pipe_name(intel_crtc->pipe),
 608                               crtc->state->adjusted_mode.crtc_hdisplay,
 609                               crtc->state->adjusted_mode.crtc_vdisplay,
 610                               fb->base.format->cpp[0] * 8,
 611                               cur_size);
 612
 613                 if (cur_size > max_size) {
 614                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 615                                       pipe_name(intel_crtc->pipe),
 616                                       cur_size, max_size);
 617                         fb = NULL;
 618                         break;
 619                 }
 620
 621                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 622                               pipe_name(intel_crtc->pipe),
 623                               max_size, cur_size);
 624         }
 625
 626         if (!fb) {
 627                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 628                 goto out;
 629         }
 630
 631         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 632         ifbdev->fb = fb;
 633
 634         drm_framebuffer_get(&ifbdev->fb->base);
 635
 636         /* Final pass to check if any active pipes don't have fbs */
 637         for_each_crtc(dev, crtc) {
 638                 intel_crtc = to_intel_crtc(crtc);
 639
 640                 if (!crtc->state->active)
 641                         continue;
 642
 643                 WARN(!crtc->primary->state->fb,
 644                      "re-used BIOS config but lost an fb on crtc %d\n",
 645                      crtc->base.id);
 646         }
 647
 648
 649         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 650         return true;
 651
 652 out:
 653
 654         return false;
 655 }
 656
 657 static void intel_fbdev_suspend_worker(struct work_struct *work)
 658 {
 659         intel_fbdev_set_suspend(&container_of(work,
 660                                               struct drm_i915_private,
 661                                               fbdev_suspend_work)->drm,
 662                                 FBINFO_STATE_RUNNING,
 663                                 true);
 664 }
 665
 666 int intel_fbdev_init(struct drm_device *dev)
 667 {
 668         struct drm_i915_private *dev_priv = to_i915(dev);
 669         struct intel_fbdev *ifbdev;
 670         int ret;
 671
 672         if (WARN_ON(!HAS_DISPLAY(dev_priv)))
 673                 return -ENODEV;
 674
 675         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 676         if (ifbdev == NULL)
 677                 return -ENOMEM;
 678
 679         mutex_init(&ifbdev->hpd_lock);
 680         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 681
 682         if (!intel_fbdev_init_bios(dev, ifbdev))
 683                 ifbdev->preferred_bpp = 32;
 684
 685         ret = drm_fb_helper_init(dev, &ifbdev->helper, 4);
 686         if (ret) {
 687                 kfree(ifbdev);
 688                 return ret;
 689         }
 690
 691         dev_priv->fbdev = ifbdev;
 692         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 693
 694         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 695
 696         return 0;
 697 }
 698
 699 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 700 {
 701         struct intel_fbdev *ifbdev = data;
 702
 703         /* Due to peculiar init order wrt to hpd handling this is separate. */
 704         if (drm_fb_helper_initial_config(&ifbdev->helper,
 705                                          ifbdev->preferred_bpp))
 706                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 707 }
 708
 709 void intel_fbdev_initial_config_async(struct drm_device *dev)
 710 {
 711         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 712
 713         if (!ifbdev)
 714                 return;
 715
 716         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 717 }
 718
 719 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 720 {
 721         if (!ifbdev->cookie)
 722                 return;
 723
 724         /* Only serialises with all preceding async calls, hence +1 */
 725         async_synchronize_cookie(ifbdev->cookie + 1);
 726         ifbdev->cookie = 0;
 727 }
 728
 729 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 730 {
 731         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 732
 733         if (!ifbdev)
 734                 return;
 735
 736         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 737         if (!current_is_async())
 738                 intel_fbdev_sync(ifbdev);
 739
 740         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 741 }
 742
 743 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 744 {
 745         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
 746
 747         if (!ifbdev)
 748                 return;
 749
 750         intel_fbdev_destroy(ifbdev);
 751 }
 752
 753 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 754  * processing, fbdev will perform a full connector reprobe if a hotplug event
 755  * was received while HPD was suspended.
 756  */
 757 static void intel_fbdev_hpd_set_suspend(struct intel_fbdev *ifbdev, int state)
 758 {
 759         bool send_hpd = false;
 760
 761         mutex_lock(&ifbdev->hpd_lock);
 762         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 763         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 764         ifbdev->hpd_waiting = false;
 765         mutex_unlock(&ifbdev->hpd_lock);
 766
 767         if (send_hpd) {
 768                 DRM_DEBUG_KMS("Handling delayed fbcon HPD event\n");
 769                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 770         }
 771 }
 772
 773 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 774 {
 775         struct drm_i915_private *dev_priv = to_i915(dev);
 776         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 777         struct fb_info *info;
 778
 779         if (!ifbdev || !ifbdev->vma)
 780                 return;
 781
 782         info = ifbdev->helper.fbdev;
 783
 784         if (synchronous) {
 785                 /* Flush any pending work to turn the console on, and then
 786                  * wait to turn it off. It must be synchronous as we are
 787                  * about to suspend or unload the driver.
 788                  *
 789                  * Note that from within the work-handler, we cannot flush
 790                  * ourselves, so only flush outstanding work upon suspend!
 791                  */
 792                 if (state != FBINFO_STATE_RUNNING)
 793                         flush_work(&dev_priv->fbdev_suspend_work);
 794
 795                 console_lock();
 796         } else {
 797                 /*
 798                  * The console lock can be pretty contented on resume due
 799                  * to all the printk activity.  Try to keep it out of the hot
 800                  * path of resume if possible.
 801                  */
 802                 WARN_ON(state != FBINFO_STATE_RUNNING);
 803                 if (!console_trylock()) {
 804                         /* Don't block our own workqueue as this can
 805                          * be run in parallel with other i915.ko tasks.
 806                          */
 807                         schedule_work(&dev_priv->fbdev_suspend_work);
 808                         return;
 809                 }
 810         }
 811
 812         /* On resume from hibernation: If the object is shmemfs backed, it has
 813          * been restored from swap. If the object is stolen however, it will be
 814          * full of whatever garbage was left in there.
 815          */
 816         if (state == FBINFO_STATE_RUNNING &&
 817             intel_fb_obj(&ifbdev->fb->base)->stolen)
 818                 memset_io(info->screen_base, 0, info->screen_size);
 819
 820         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 821         console_unlock();
 822
 823         intel_fbdev_hpd_set_suspend(ifbdev, state);
 824 }
 825
 826 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 827 {
 828         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 829         bool send_hpd;
 830
 831         if (!ifbdev)
 832                 return;
 833
 834         intel_fbdev_sync(ifbdev);
 835
 836         mutex_lock(&ifbdev->hpd_lock);
 837         send_hpd = !ifbdev->hpd_suspended;
 838         ifbdev->hpd_waiting = true;
 839         mutex_unlock(&ifbdev->hpd_lock);
 840
 841         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 842                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 843 }
 844
 845 void intel_fbdev_restore_mode(struct drm_device *dev)
 846 {
 847         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 848
 849         if (!ifbdev)
 850                 return;
 851
 852         intel_fbdev_sync(ifbdev);
 853         if (!ifbdev->vma)
 854                 return;
 855
 856         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 857                 intel_fbdev_invalidate(ifbdev);
 858 }