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/fb.h>
  38 #include <linux/init.h>
  39 #include <linux/vga_switcheroo.h>
  40
  41 #include <drm/drmP.h>
  42 #include <drm/drm_crtc.h>
  43 #include <drm/drm_fb_helper.h>
  44 #include "intel_drv.h"
  45 #include <drm/i915_drm.h>
  46 #include "i915_drv.h"
  47
  48 static int intel_fbdev_set_par(struct fb_info *info)
  49 {
  50         struct drm_fb_helper *fb_helper = info->par;
  51         struct intel_fbdev *ifbdev =
  52                 container_of(fb_helper, struct intel_fbdev, helper);
  53         int ret;
  54
  55         ret = drm_fb_helper_set_par(info);
  56
  57         if (ret == 0) {
  58                 mutex_lock(&fb_helper->dev->struct_mutex);
  59                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  60                 mutex_unlock(&fb_helper->dev->struct_mutex);
  61         }
  62
  63         return ret;
  64 }
  65
  66 static int intel_fbdev_blank(int blank, struct fb_info *info)
  67 {
  68         struct drm_fb_helper *fb_helper = info->par;
  69         struct intel_fbdev *ifbdev =
  70                 container_of(fb_helper, struct intel_fbdev, helper);
  71         int ret;
  72
  73         ret = drm_fb_helper_blank(blank, info);
  74
  75         if (ret == 0) {
  76                 mutex_lock(&fb_helper->dev->struct_mutex);
  77                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  78                 mutex_unlock(&fb_helper->dev->struct_mutex);
  79         }
  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
  91         int ret;
  92         ret = drm_fb_helper_pan_display(var, info);
  93
  94         if (ret == 0) {
  95                 mutex_lock(&fb_helper->dev->struct_mutex);
  96                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  97                 mutex_unlock(&fb_helper->dev->struct_mutex);
  98         }
  99
 100         return ret;
 101 }
 102
 103 static struct fb_ops intelfb_ops = {
 104         .owner = THIS_MODULE,
 105         .fb_check_var = drm_fb_helper_check_var,
 106         .fb_set_par = intel_fbdev_set_par,
 107         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 108         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 109         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 110         .fb_pan_display = intel_fbdev_pan_display,
 111         .fb_blank = intel_fbdev_blank,
 112         .fb_setcmap = drm_fb_helper_setcmap,
 113         .fb_debug_enter = drm_fb_helper_debug_enter,
 114         .fb_debug_leave = drm_fb_helper_debug_leave,
 115 };
 116
 117 static int intelfb_alloc(struct drm_fb_helper *helper,
 118                          struct drm_fb_helper_surface_size *sizes)
 119 {
 120         struct intel_fbdev *ifbdev =
 121                 container_of(helper, struct intel_fbdev, helper);
 122         struct drm_framebuffer *fb = NULL;
 123         struct drm_device *dev = helper->dev;
 124         struct drm_i915_private *dev_priv = to_i915(dev);
 125         struct drm_mode_fb_cmd2 mode_cmd = {};
 126         struct drm_i915_gem_object *obj = NULL;
 127         int size, ret;
 128
 129         /* we don't do packed 24bpp */
 130         if (sizes->surface_bpp == 24)
 131                 sizes->surface_bpp = 32;
 132
 133         mode_cmd.width = sizes->surface_width;
 134         mode_cmd.height = sizes->surface_height;
 135
 136         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 137                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 138         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 139                                                           sizes->surface_depth);
 140
 141         mutex_lock(&dev->struct_mutex);
 142
 143         size = mode_cmd.pitches[0] * mode_cmd.height;
 144         size = PAGE_ALIGN(size);
 145
 146         /* If the FB is too big, just don't use it since fbdev is not very
 147          * important and we should probably use that space with FBC or other
 148          * features. */
 149         if (size * 2 < dev_priv->gtt.stolen_usable_size)
 150                 obj = i915_gem_object_create_stolen(dev, size);
 151         if (obj == NULL)
 152                 obj = i915_gem_alloc_object(dev, size);
 153         if (!obj) {
 154                 DRM_ERROR("failed to allocate framebuffer\n");
 155                 ret = -ENOMEM;
 156                 goto out;
 157         }
 158
 159         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 160         if (IS_ERR(fb)) {
 161                 drm_gem_object_unreference(&obj->base);
 162                 ret = PTR_ERR(fb);
 163                 goto out;
 164         }
 165
 166         mutex_unlock(&dev->struct_mutex);
 167
 168         ifbdev->fb = to_intel_framebuffer(fb);
 169
 170         return 0;
 171
 172 out:
 173         mutex_unlock(&dev->struct_mutex);
 174         if (!IS_ERR_OR_NULL(fb))
 175                 drm_framebuffer_unreference(fb);
 176         return ret;
 177 }
 178
 179 static int intelfb_create(struct drm_fb_helper *helper,
 180                           struct drm_fb_helper_surface_size *sizes)
 181 {
 182         struct intel_fbdev *ifbdev =
 183                 container_of(helper, struct intel_fbdev, helper);
 184         struct intel_framebuffer *intel_fb = ifbdev->fb;
 185         struct drm_device *dev = helper->dev;
 186         struct drm_i915_private *dev_priv = dev->dev_private;
 187         struct fb_info *info;
 188         struct drm_framebuffer *fb;
 189         struct drm_i915_gem_object *obj;
 190         int size, ret;
 191         bool prealloc = false;
 192
 193         if (intel_fb &&
 194             (sizes->fb_width > intel_fb->base.width ||
 195              sizes->fb_height > intel_fb->base.height)) {
 196                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 197                               " releasing it\n",
 198                               intel_fb->base.width, intel_fb->base.height,
 199                               sizes->fb_width, sizes->fb_height);
 200                 drm_framebuffer_unreference(&intel_fb->base);
 201                 intel_fb = ifbdev->fb = NULL;
 202         }
 203         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 204                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 205                 ret = intelfb_alloc(helper, sizes);
 206                 if (ret)
 207                         return ret;
 208                 intel_fb = ifbdev->fb;
 209         } else {
 210                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 211                 prealloc = true;
 212                 sizes->fb_width = intel_fb->base.width;
 213                 sizes->fb_height = intel_fb->base.height;
 214         }
 215
 216         obj = intel_fb->obj;
 217         size = obj->base.size;
 218
 219         mutex_lock(&dev->struct_mutex);
 220
 221         /* Pin the GGTT vma for our access via info->screen_base.
 222          * This also validates that any existing fb inherited from the
 223          * BIOS is suitable for own access.
 224          */
 225         ret = intel_pin_and_fence_fb_obj(NULL, &ifbdev->fb->base, NULL);
 226         if (ret)
 227                 goto out_unlock;
 228
 229         info = drm_fb_helper_alloc_fbi(helper);
 230         if (IS_ERR(info)) {
 231                 DRM_ERROR("Failed to allocate fb_info\n");
 232                 ret = PTR_ERR(info);
 233                 goto out_unpin;
 234         }
 235
 236         info->par = helper;
 237
 238         fb = &ifbdev->fb->base;
 239
 240         ifbdev->helper.fb = fb;
 241
 242         strcpy(info->fix.id, "inteldrmfb");
 243
 244         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 245         info->fbops = &intelfb_ops;
 246
 247         /* setup aperture base/size for vesafb takeover */
 248         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 249         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 250
 251         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 252         info->fix.smem_len = size;
 253
 254         info->screen_base =
 255                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 256                            size);
 257         if (!info->screen_base) {
 258                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 259                 ret = -ENOSPC;
 260                 goto out_destroy_fbi;
 261         }
 262         info->screen_size = size;
 263
 264         /* This driver doesn't need a VT switch to restore the mode on resume */
 265         info->skip_vt_switch = true;
 266
 267         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 268         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 269
 270         /* If the object is shmemfs backed, it will have given us zeroed pages.
 271          * If the object is stolen however, it will be full of whatever
 272          * garbage was left in there.
 273          */
 274         if (ifbdev->fb->obj->stolen && !prealloc)
 275                 memset_io(info->screen_base, 0, info->screen_size);
 276
 277         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 278
 279         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08llx, bo %p\n",
 280                       fb->width, fb->height,
 281                       i915_gem_obj_ggtt_offset(obj), obj);
 282
 283         mutex_unlock(&dev->struct_mutex);
 284         vga_switcheroo_client_fb_set(dev->pdev, info);
 285         return 0;
 286
 287 out_destroy_fbi:
 288         drm_fb_helper_release_fbi(helper);
 289 out_unpin:
 290         i915_gem_object_ggtt_unpin(obj);
 291 out_unlock:
 292         mutex_unlock(&dev->struct_mutex);
 293         return ret;
 294 }
 295
 296 /** Sets the color ramps on behalf of RandR */
 297 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 298                                     u16 blue, int regno)
 299 {
 300         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 301
 302         intel_crtc->lut_r[regno] = red >> 8;
 303         intel_crtc->lut_g[regno] = green >> 8;
 304         intel_crtc->lut_b[regno] = blue >> 8;
 305 }
 306
 307 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 308                                     u16 *blue, int regno)
 309 {
 310         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 311
 312         *red = intel_crtc->lut_r[regno] << 8;
 313         *green = intel_crtc->lut_g[regno] << 8;
 314         *blue = intel_crtc->lut_b[regno] << 8;
 315 }
 316
 317 static struct drm_fb_helper_crtc *
 318 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 319 {
 320         int i;
 321
 322         for (i = 0; i < fb_helper->crtc_count; i++)
 323                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 324                         return &fb_helper->crtc_info[i];
 325
 326         return NULL;
 327 }
 328
 329 /*
 330  * Try to read the BIOS display configuration and use it for the initial
 331  * fb configuration.
 332  *
 333  * The BIOS or boot loader will generally create an initial display
 334  * configuration for us that includes some set of active pipes and displays.
 335  * This routine tries to figure out which pipes and connectors are active
 336  * and stuffs them into the crtcs and modes array given to us by the
 337  * drm_fb_helper code.
 338  *
 339  * The overall sequence is:
 340  *   intel_fbdev_init - from driver load
 341  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 342  *     drm_fb_helper_init - build fb helper structs
 343  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 344  *   intel_fbdev_initial_config - apply the config
 345  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 346  *         drm_setup_crtcs - build crtc config for fbdev
 347  *           intel_fb_initial_config - find active connectors etc
 348  *         drm_fb_helper_single_fb_probe - set up fbdev
 349  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 350  *
 351  * Note that we don't make special consideration whether we could actually
 352  * switch to the selected modes without a full modeset. E.g. when the display
 353  * is in VGA mode we need to recalculate watermarks and set a new high-res
 354  * framebuffer anyway.
 355  */
 356 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 357                                     struct drm_fb_helper_crtc **crtcs,
 358                                     struct drm_display_mode **modes,
 359                                     struct drm_fb_offset *offsets,
 360                                     bool *enabled, int width, int height)
 361 {
 362         struct drm_device *dev = fb_helper->dev;
 363         int i, j;
 364         bool *save_enabled;
 365         bool fallback = true;
 366         int num_connectors_enabled = 0;
 367         int num_connectors_detected = 0;
 368         uint64_t conn_configured = 0, mask;
 369         int pass = 0;
 370
 371         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
 372                                GFP_KERNEL);
 373         if (!save_enabled)
 374                 return false;
 375
 376         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
 377         mask = (1 << fb_helper->connector_count) - 1;
 378 retry:
 379         for (i = 0; i < fb_helper->connector_count; i++) {
 380                 struct drm_fb_helper_connector *fb_conn;
 381                 struct drm_connector *connector;
 382                 struct drm_encoder *encoder;
 383                 struct drm_fb_helper_crtc *new_crtc;
 384
 385                 fb_conn = fb_helper->connector_info[i];
 386                 connector = fb_conn->connector;
 387
 388                 if (conn_configured & (1 << i))
 389                         continue;
 390
 391                 if (pass == 0 && !connector->has_tile)
 392                         continue;
 393
 394                 if (connector->status == connector_status_connected)
 395                         num_connectors_detected++;
 396
 397                 if (!enabled[i]) {
 398                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 399                                       connector->name);
 400                         conn_configured |= (1 << i);
 401                         continue;
 402                 }
 403
 404                 if (connector->force == DRM_FORCE_OFF) {
 405                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 406                                       connector->name);
 407                         enabled[i] = false;
 408                         continue;
 409                 }
 410
 411                 encoder = connector->encoder;
 412                 if (!encoder || WARN_ON(!encoder->crtc)) {
 413                         if (connector->force > DRM_FORCE_OFF)
 414                                 goto bail;
 415
 416                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 417                                       connector->name);
 418                         enabled[i] = false;
 419                         conn_configured |= (1 << i);
 420                         continue;
 421                 }
 422
 423                 num_connectors_enabled++;
 424
 425                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
 426
 427                 /*
 428                  * Make sure we're not trying to drive multiple connectors
 429                  * with a single CRTC, since our cloning support may not
 430                  * match the BIOS.
 431                  */
 432                 for (j = 0; j < fb_helper->connector_count; j++) {
 433                         if (crtcs[j] == new_crtc) {
 434                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 435                                 goto bail;
 436                         }
 437                 }
 438
 439                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 440                               connector->name);
 441
 442                 /* go for command line mode first */
 443                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 444
 445                 /* try for preferred next */
 446                 if (!modes[i]) {
 447                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 448                                       connector->name, connector->has_tile);
 449                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 450                                                           height);
 451                 }
 452
 453                 /* No preferred mode marked by the EDID? Are there any modes? */
 454                 if (!modes[i] && !list_empty(&connector->modes)) {
 455                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 456                                       connector->name);
 457                         modes[i] = list_first_entry(&connector->modes,
 458                                                     struct drm_display_mode,
 459                                                     head);
 460                 }
 461
 462                 /* last resort: use current mode */
 463                 if (!modes[i]) {
 464                         /*
 465                          * IMPORTANT: We want to use the adjusted mode (i.e.
 466                          * after the panel fitter upscaling) as the initial
 467                          * config, not the input mode, which is what crtc->mode
 468                          * usually contains. But since our current
 469                          * code puts a mode derived from the post-pfit timings
 470                          * into crtc->mode this works out correctly.
 471                          */
 472                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 473                                       connector->name);
 474                         modes[i] = &encoder->crtc->mode;
 475                 }
 476                 crtcs[i] = new_crtc;
 477
 478                 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
 479                               connector->name,
 480                               pipe_name(to_intel_crtc(encoder->crtc)->pipe),
 481                               encoder->crtc->base.id,
 482                               modes[i]->hdisplay, modes[i]->vdisplay,
 483                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 484
 485                 fallback = false;
 486                 conn_configured |= (1 << i);
 487         }
 488
 489         if ((conn_configured & mask) != mask) {
 490                 pass++;
 491                 goto retry;
 492         }
 493
 494         /*
 495          * If the BIOS didn't enable everything it could, fall back to have the
 496          * same user experiencing of lighting up as much as possible like the
 497          * fbdev helper library.
 498          */
 499         if (num_connectors_enabled != num_connectors_detected &&
 500             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 501                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 502                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 503                               num_connectors_detected);
 504                 fallback = true;
 505         }
 506
 507         if (fallback) {
 508 bail:
 509                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 510                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
 511                 kfree(save_enabled);
 512                 return false;
 513         }
 514
 515         kfree(save_enabled);
 516         return true;
 517 }
 518
 519 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 520         .initial_config = intel_fb_initial_config,
 521         .gamma_set = intel_crtc_fb_gamma_set,
 522         .gamma_get = intel_crtc_fb_gamma_get,
 523         .fb_probe = intelfb_create,
 524 };
 525
 526 static void intel_fbdev_destroy(struct drm_device *dev,
 527                                 struct intel_fbdev *ifbdev)
 528 {
 529         /* We rely on the object-free to release the VMA pinning for
 530          * the info->screen_base mmaping. Leaking the VMA is simpler than
 531          * trying to rectify all the possible error paths leading here.
 532          */
 533
 534         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 535         drm_fb_helper_release_fbi(&ifbdev->helper);
 536
 537         drm_fb_helper_fini(&ifbdev->helper);
 538
 539         if (ifbdev->fb) {
 540                 drm_framebuffer_unregister_private(&ifbdev->fb->base);
 541                 drm_framebuffer_remove(&ifbdev->fb->base);
 542         }
 543 }
 544
 545 /*
 546  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 547  * The core display code will have read out the current plane configuration,
 548  * so we use that to figure out if there's an object for us to use as the
 549  * fb, and if so, we re-use it for the fbdev configuration.
 550  *
 551  * Note we only support a single fb shared across pipes for boot (mostly for
 552  * fbcon), so we just find the biggest and use that.
 553  */
 554 static bool intel_fbdev_init_bios(struct drm_device *dev,
 555                                  struct intel_fbdev *ifbdev)
 556 {
 557         struct intel_framebuffer *fb = NULL;
 558         struct drm_crtc *crtc;
 559         struct intel_crtc *intel_crtc;
 560         unsigned int max_size = 0;
 561
 562         /* Find the largest fb */
 563         for_each_crtc(dev, crtc) {
 564                 struct drm_i915_gem_object *obj =
 565                         intel_fb_obj(crtc->primary->state->fb);
 566                 intel_crtc = to_intel_crtc(crtc);
 567
 568                 if (!crtc->state->active || !obj) {
 569                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 570                                       pipe_name(intel_crtc->pipe));
 571                         continue;
 572                 }
 573
 574                 if (obj->base.size > max_size) {
 575                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 576                                       pipe_name(intel_crtc->pipe));
 577                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 578                         max_size = obj->base.size;
 579                 }
 580         }
 581
 582         if (!fb) {
 583                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 584                 goto out;
 585         }
 586
 587         /* Now make sure all the pipes will fit into it */
 588         for_each_crtc(dev, crtc) {
 589                 unsigned int cur_size;
 590
 591                 intel_crtc = to_intel_crtc(crtc);
 592
 593                 if (!crtc->state->active) {
 594                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 595                                       pipe_name(intel_crtc->pipe));
 596                         continue;
 597                 }
 598
 599                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 600                               pipe_name(intel_crtc->pipe));
 601
 602                 /*
 603                  * See if the plane fb we found above will fit on this
 604                  * pipe.  Note we need to use the selected fb's pitch and bpp
 605                  * rather than the current pipe's, since they differ.
 606                  */
 607                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 608                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 609                 if (fb->base.pitches[0] < cur_size) {
 610                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 611                                       pipe_name(intel_crtc->pipe),
 612                                       cur_size, fb->base.pitches[0]);
 613                         fb = NULL;
 614                         break;
 615                 }
 616
 617                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 618                 cur_size = intel_fb_align_height(dev, cur_size,
 619                                                  fb->base.pixel_format,
 620                                                  fb->base.modifier[0]);
 621                 cur_size *= fb->base.pitches[0];
 622                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 623                               pipe_name(intel_crtc->pipe),
 624                               intel_crtc->config->base.adjusted_mode.crtc_hdisplay,
 625                               intel_crtc->config->base.adjusted_mode.crtc_vdisplay,
 626                               fb->base.bits_per_pixel,
 627                               cur_size);
 628
 629                 if (cur_size > max_size) {
 630                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 631                                       pipe_name(intel_crtc->pipe),
 632                                       cur_size, max_size);
 633                         fb = NULL;
 634                         break;
 635                 }
 636
 637                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 638                               pipe_name(intel_crtc->pipe),
 639                               max_size, cur_size);
 640         }
 641
 642         if (!fb) {
 643                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 644                 goto out;
 645         }
 646
 647         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 648         ifbdev->fb = fb;
 649
 650         drm_framebuffer_reference(&ifbdev->fb->base);
 651
 652         /* Final pass to check if any active pipes don't have fbs */
 653         for_each_crtc(dev, crtc) {
 654                 intel_crtc = to_intel_crtc(crtc);
 655
 656                 if (!crtc->state->active)
 657                         continue;
 658
 659                 WARN(!crtc->primary->fb,
 660                      "re-used BIOS config but lost an fb on crtc %d\n",
 661                      crtc->base.id);
 662         }
 663
 664
 665         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 666         return true;
 667
 668 out:
 669
 670         return false;
 671 }
 672
 673 static void intel_fbdev_suspend_worker(struct work_struct *work)
 674 {
 675         intel_fbdev_set_suspend(container_of(work,
 676                                              struct drm_i915_private,
 677                                              fbdev_suspend_work)->dev,
 678                                 FBINFO_STATE_RUNNING,
 679                                 true);
 680 }
 681
 682 int intel_fbdev_init(struct drm_device *dev)
 683 {
 684         struct intel_fbdev *ifbdev;
 685         struct drm_i915_private *dev_priv = dev->dev_private;
 686         int ret;
 687
 688         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 689                 return -ENODEV;
 690
 691         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 692         if (ifbdev == NULL)
 693                 return -ENOMEM;
 694
 695         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 696
 697         if (!intel_fbdev_init_bios(dev, ifbdev))
 698                 ifbdev->preferred_bpp = 32;
 699
 700         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 701                                  INTEL_INFO(dev)->num_pipes, 4);
 702         if (ret) {
 703                 kfree(ifbdev);
 704                 return ret;
 705         }
 706
 707         ifbdev->helper.atomic = true;
 708
 709         dev_priv->fbdev = ifbdev;
 710         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 711
 712         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 713
 714         return 0;
 715 }
 716
 717 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 718 {
 719         struct drm_i915_private *dev_priv = data;
 720         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 721
 722         /* Due to peculiar init order wrt to hpd handling this is separate. */
 723         if (drm_fb_helper_initial_config(&ifbdev->helper,
 724                                          ifbdev->preferred_bpp))
 725                 intel_fbdev_fini(dev_priv->dev);
 726 }
 727
 728 void intel_fbdev_initial_config_async(struct drm_device *dev)
 729 {
 730         async_schedule(intel_fbdev_initial_config, to_i915(dev));
 731 }
 732
 733 void intel_fbdev_fini(struct drm_device *dev)
 734 {
 735         struct drm_i915_private *dev_priv = dev->dev_private;
 736         if (!dev_priv->fbdev)
 737                 return;
 738
 739         flush_work(&dev_priv->fbdev_suspend_work);
 740
 741         if (!current_is_async())
 742                 async_synchronize_full();
 743         intel_fbdev_destroy(dev, dev_priv->fbdev);
 744         kfree(dev_priv->fbdev);
 745         dev_priv->fbdev = NULL;
 746 }
 747
 748 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 749 {
 750         struct drm_i915_private *dev_priv = dev->dev_private;
 751         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 752         struct fb_info *info;
 753
 754         if (!ifbdev)
 755                 return;
 756
 757         info = ifbdev->helper.fbdev;
 758
 759         if (synchronous) {
 760                 /* Flush any pending work to turn the console on, and then
 761                  * wait to turn it off. It must be synchronous as we are
 762                  * about to suspend or unload the driver.
 763                  *
 764                  * Note that from within the work-handler, we cannot flush
 765                  * ourselves, so only flush outstanding work upon suspend!
 766                  */
 767                 if (state != FBINFO_STATE_RUNNING)
 768                         flush_work(&dev_priv->fbdev_suspend_work);
 769                 console_lock();
 770         } else {
 771                 /*
 772                  * The console lock can be pretty contented on resume due
 773                  * to all the printk activity.  Try to keep it out of the hot
 774                  * path of resume if possible.
 775                  */
 776                 WARN_ON(state != FBINFO_STATE_RUNNING);
 777                 if (!console_trylock()) {
 778                         /* Don't block our own workqueue as this can
 779                          * be run in parallel with other i915.ko tasks.
 780                          */
 781                         schedule_work(&dev_priv->fbdev_suspend_work);
 782                         return;
 783                 }
 784         }
 785
 786         /* On resume from hibernation: If the object is shmemfs backed, it has
 787          * been restored from swap. If the object is stolen however, it will be
 788          * full of whatever garbage was left in there.
 789          */
 790         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 791                 memset_io(info->screen_base, 0, info->screen_size);
 792
 793         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 794         console_unlock();
 795 }
 796
 797 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 798 {
 799         struct drm_i915_private *dev_priv = dev->dev_private;
 800         if (dev_priv->fbdev)
 801                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 802 }
 803
 804 void intel_fbdev_restore_mode(struct drm_device *dev)
 805 {
 806         int ret;
 807         struct drm_i915_private *dev_priv = dev->dev_private;
 808         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 809         struct drm_fb_helper *fb_helper;
 810
 811         if (!ifbdev)
 812                 return;
 813
 814         fb_helper = &ifbdev->helper;
 815
 816         ret = drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
 817         if (ret) {
 818                 DRM_DEBUG("failed to restore crtc mode\n");
 819         } else {
 820                 mutex_lock(&fb_helper->dev->struct_mutex);
 821                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 822                 mutex_unlock(&fb_helper->dev->struct_mutex);
 823         }
 824 }