drivers/gpu/drm/i915/intel_fbdev.c

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