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;
 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->ggtt.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         return ret;
 175 }
 176
 177 static int intelfb_create(struct drm_fb_helper *helper,
 178                           struct drm_fb_helper_surface_size *sizes)
 179 {
 180         struct intel_fbdev *ifbdev =
 181                 container_of(helper, struct intel_fbdev, helper);
 182         struct intel_framebuffer *intel_fb = ifbdev->fb;
 183         struct drm_device *dev = helper->dev;
 184         struct drm_i915_private *dev_priv = dev->dev_private;
 185         struct fb_info *info;
 186         struct drm_framebuffer *fb;
 187         struct drm_i915_gem_object *obj;
 188         int size, ret;
 189         bool prealloc = false;
 190
 191         if (intel_fb &&
 192             (sizes->fb_width > intel_fb->base.width ||
 193              sizes->fb_height > intel_fb->base.height)) {
 194                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 195                               " releasing it\n",
 196                               intel_fb->base.width, intel_fb->base.height,
 197                               sizes->fb_width, sizes->fb_height);
 198                 drm_framebuffer_unreference(&intel_fb->base);
 199                 intel_fb = ifbdev->fb = NULL;
 200         }
 201         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 202                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 203                 ret = intelfb_alloc(helper, sizes);
 204                 if (ret)
 205                         return ret;
 206                 intel_fb = ifbdev->fb;
 207         } else {
 208                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 209                 prealloc = true;
 210                 sizes->fb_width = intel_fb->base.width;
 211                 sizes->fb_height = intel_fb->base.height;
 212         }
 213
 214         obj = intel_fb->obj;
 215         size = obj->base.size;
 216
 217         mutex_lock(&dev->struct_mutex);
 218
 219         /* Pin the GGTT vma for our access via info->screen_base.
 220          * This also validates that any existing fb inherited from the
 221          * BIOS is suitable for own access.
 222          */
 223         ret = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, BIT(DRM_ROTATE_0));
 224         if (ret)
 225                 goto out_unlock;
 226
 227         info = drm_fb_helper_alloc_fbi(helper);
 228         if (IS_ERR(info)) {
 229                 DRM_ERROR("Failed to allocate fb_info\n");
 230                 ret = PTR_ERR(info);
 231                 goto out_unpin;
 232         }
 233
 234         info->par = helper;
 235
 236         fb = &ifbdev->fb->base;
 237
 238         ifbdev->helper.fb = fb;
 239
 240         strcpy(info->fix.id, "inteldrmfb");
 241
 242         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 243         info->fbops = &intelfb_ops;
 244
 245         /* setup aperture base/size for vesafb takeover */
 246         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 247         info->apertures->ranges[0].size = dev_priv->ggtt.mappable_end;
 248
 249         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 250         info->fix.smem_len = size;
 251
 252         info->screen_base =
 253                 ioremap_wc(dev_priv->ggtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 254                            size);
 255         if (!info->screen_base) {
 256                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 257                 ret = -ENOSPC;
 258                 goto out_destroy_fbi;
 259         }
 260         info->screen_size = size;
 261
 262         /* This driver doesn't need a VT switch to restore the mode on resume */
 263         info->skip_vt_switch = true;
 264
 265         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 266         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 267
 268         /* If the object is shmemfs backed, it will have given us zeroed pages.
 269          * If the object is stolen however, it will be full of whatever
 270          * garbage was left in there.
 271          */
 272         if (ifbdev->fb->obj->stolen && !prealloc)
 273                 memset_io(info->screen_base, 0, info->screen_size);
 274
 275         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 276
 277         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08llx, bo %p\n",
 278                       fb->width, fb->height,
 279                       i915_gem_obj_ggtt_offset(obj), obj);
 280
 281         mutex_unlock(&dev->struct_mutex);
 282         vga_switcheroo_client_fb_set(dev->pdev, info);
 283         return 0;
 284
 285 out_destroy_fbi:
 286         drm_fb_helper_release_fbi(helper);
 287 out_unpin:
 288         i915_gem_object_ggtt_unpin(obj);
 289 out_unlock:
 290         mutex_unlock(&dev->struct_mutex);
 291         return ret;
 292 }
 293
 294 /** Sets the color ramps on behalf of RandR */
 295 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 296                                     u16 blue, int regno)
 297 {
 298         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 299
 300         intel_crtc->lut_r[regno] = red >> 8;
 301         intel_crtc->lut_g[regno] = green >> 8;
 302         intel_crtc->lut_b[regno] = blue >> 8;
 303 }
 304
 305 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 306                                     u16 *blue, int regno)
 307 {
 308         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 309
 310         *red = intel_crtc->lut_r[regno] << 8;
 311         *green = intel_crtc->lut_g[regno] << 8;
 312         *blue = intel_crtc->lut_b[regno] << 8;
 313 }
 314
 315 static struct drm_fb_helper_crtc *
 316 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 317 {
 318         int i;
 319
 320         for (i = 0; i < fb_helper->crtc_count; i++)
 321                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 322                         return &fb_helper->crtc_info[i];
 323
 324         return NULL;
 325 }
 326
 327 /*
 328  * Try to read the BIOS display configuration and use it for the initial
 329  * fb configuration.
 330  *
 331  * The BIOS or boot loader will generally create an initial display
 332  * configuration for us that includes some set of active pipes and displays.
 333  * This routine tries to figure out which pipes and connectors are active
 334  * and stuffs them into the crtcs and modes array given to us by the
 335  * drm_fb_helper code.
 336  *
 337  * The overall sequence is:
 338  *   intel_fbdev_init - from driver load
 339  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 340  *     drm_fb_helper_init - build fb helper structs
 341  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 342  *   intel_fbdev_initial_config - apply the config
 343  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 344  *         drm_setup_crtcs - build crtc config for fbdev
 345  *           intel_fb_initial_config - find active connectors etc
 346  *         drm_fb_helper_single_fb_probe - set up fbdev
 347  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 348  *
 349  * Note that we don't make special consideration whether we could actually
 350  * switch to the selected modes without a full modeset. E.g. when the display
 351  * is in VGA mode we need to recalculate watermarks and set a new high-res
 352  * framebuffer anyway.
 353  */
 354 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 355                                     struct drm_fb_helper_crtc **crtcs,
 356                                     struct drm_display_mode **modes,
 357                                     struct drm_fb_offset *offsets,
 358                                     bool *enabled, int width, int height)
 359 {
 360         struct drm_device *dev = fb_helper->dev;
 361         int i, j;
 362         bool *save_enabled;
 363         bool fallback = true;
 364         int num_connectors_enabled = 0;
 365         int num_connectors_detected = 0;
 366         uint64_t conn_configured = 0, mask;
 367         int pass = 0;
 368
 369         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
 370                                GFP_KERNEL);
 371         if (!save_enabled)
 372                 return false;
 373
 374         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
 375         mask = (1 << fb_helper->connector_count) - 1;
 376 retry:
 377         for (i = 0; i < fb_helper->connector_count; i++) {
 378                 struct drm_fb_helper_connector *fb_conn;
 379                 struct drm_connector *connector;
 380                 struct drm_encoder *encoder;
 381                 struct drm_fb_helper_crtc *new_crtc;
 382                 struct intel_crtc *intel_crtc;
 383
 384                 fb_conn = fb_helper->connector_info[i];
 385                 connector = fb_conn->connector;
 386
 387                 if (conn_configured & (1 << i))
 388                         continue;
 389
 390                 if (pass == 0 && !connector->has_tile)
 391                         continue;
 392
 393                 if (connector->status == connector_status_connected)
 394                         num_connectors_detected++;
 395
 396                 if (!enabled[i]) {
 397                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 398                                       connector->name);
 399                         conn_configured |= (1 << i);
 400                         continue;
 401                 }
 402
 403                 if (connector->force == DRM_FORCE_OFF) {
 404                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 405                                       connector->name);
 406                         enabled[i] = false;
 407                         continue;
 408                 }
 409
 410                 encoder = connector->state->best_encoder;
 411                 if (!encoder || WARN_ON(!connector->state->crtc)) {
 412                         if (connector->force > DRM_FORCE_OFF)
 413                                 goto bail;
 414
 415                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 416                                       connector->name);
 417                         enabled[i] = false;
 418                         conn_configured |= (1 << i);
 419                         continue;
 420                 }
 421
 422                 num_connectors_enabled++;
 423
 424                 intel_crtc = to_intel_crtc(connector->state->crtc);
 425                 for (j = 0; j < 256; j++) {
 426                         intel_crtc->lut_r[j] = j;
 427                         intel_crtc->lut_g[j] = j;
 428                         intel_crtc->lut_b[j] = j;
 429                 }
 430
 431                 new_crtc = intel_fb_helper_crtc(fb_helper, connector->state->crtc);
 432
 433                 /*
 434                  * Make sure we're not trying to drive multiple connectors
 435                  * with a single CRTC, since our cloning support may not
 436                  * match the BIOS.
 437                  */
 438                 for (j = 0; j < fb_helper->connector_count; j++) {
 439                         if (crtcs[j] == new_crtc) {
 440                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 441                                 goto bail;
 442                         }
 443                 }
 444
 445                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 446                               connector->name);
 447
 448                 /* go for command line mode first */
 449                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 450
 451                 /* try for preferred next */
 452                 if (!modes[i]) {
 453                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 454                                       connector->name, connector->has_tile);
 455                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 456                                                           height);
 457                 }
 458
 459                 /* No preferred mode marked by the EDID? Are there any modes? */
 460                 if (!modes[i] && !list_empty(&connector->modes)) {
 461                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 462                                       connector->name);
 463                         modes[i] = list_first_entry(&connector->modes,
 464                                                     struct drm_display_mode,
 465                                                     head);
 466                 }
 467
 468                 /* last resort: use current mode */
 469                 if (!modes[i]) {
 470                         /*
 471                          * IMPORTANT: We want to use the adjusted mode (i.e.
 472                          * after the panel fitter upscaling) as the initial
 473                          * config, not the input mode, which is what crtc->mode
 474                          * usually contains. But since our current
 475                          * code puts a mode derived from the post-pfit timings
 476                          * into crtc->mode this works out correctly.
 477                          *
 478                          * This is crtc->mode and not crtc->state->mode for the
 479                          * fastboot check to work correctly. crtc_state->mode has
 480                          * I915_MODE_FLAG_INHERITED, which we clear to force check
 481                          * state.
 482                          */
 483                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 484                                       connector->name);
 485                         modes[i] = &connector->state->crtc->mode;
 486                 }
 487                 crtcs[i] = new_crtc;
 488
 489                 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
 490                               connector->name,
 491                               pipe_name(to_intel_crtc(connector->state->crtc)->pipe),
 492                               connector->state->crtc->base.id,
 493                               modes[i]->hdisplay, modes[i]->vdisplay,
 494                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 495
 496                 fallback = false;
 497                 conn_configured |= (1 << i);
 498         }
 499
 500         if ((conn_configured & mask) != mask) {
 501                 pass++;
 502                 goto retry;
 503         }
 504
 505         /*
 506          * If the BIOS didn't enable everything it could, fall back to have the
 507          * same user experiencing of lighting up as much as possible like the
 508          * fbdev helper library.
 509          */
 510         if (num_connectors_enabled != num_connectors_detected &&
 511             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 512                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 513                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 514                               num_connectors_detected);
 515                 fallback = true;
 516         }
 517
 518         if (fallback) {
 519 bail:
 520                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 521                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
 522                 kfree(save_enabled);
 523                 return false;
 524         }
 525
 526         kfree(save_enabled);
 527         return true;
 528 }
 529
 530 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 531         .initial_config = intel_fb_initial_config,
 532         .gamma_set = intel_crtc_fb_gamma_set,
 533         .gamma_get = intel_crtc_fb_gamma_get,
 534         .fb_probe = intelfb_create,
 535 };
 536
 537 static void intel_fbdev_destroy(struct drm_device *dev,
 538                                 struct intel_fbdev *ifbdev)
 539 {
 540         /* We rely on the object-free to release the VMA pinning for
 541          * the info->screen_base mmaping. Leaking the VMA is simpler than
 542          * trying to rectify all the possible error paths leading here.
 543          */
 544
 545         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 546         drm_fb_helper_release_fbi(&ifbdev->helper);
 547
 548         drm_fb_helper_fini(&ifbdev->helper);
 549
 550         if (ifbdev->fb) {
 551                 drm_framebuffer_unregister_private(&ifbdev->fb->base);
 552                 drm_framebuffer_remove(&ifbdev->fb->base);
 553         }
 554 }
 555
 556 /*
 557  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 558  * The core display code will have read out the current plane configuration,
 559  * so we use that to figure out if there's an object for us to use as the
 560  * fb, and if so, we re-use it for the fbdev configuration.
 561  *
 562  * Note we only support a single fb shared across pipes for boot (mostly for
 563  * fbcon), so we just find the biggest and use that.
 564  */
 565 static bool intel_fbdev_init_bios(struct drm_device *dev,
 566                                  struct intel_fbdev *ifbdev)
 567 {
 568         struct intel_framebuffer *fb = NULL;
 569         struct drm_crtc *crtc;
 570         struct intel_crtc *intel_crtc;
 571         unsigned int max_size = 0;
 572
 573         /* Find the largest fb */
 574         for_each_crtc(dev, crtc) {
 575                 struct drm_i915_gem_object *obj =
 576                         intel_fb_obj(crtc->primary->state->fb);
 577                 intel_crtc = to_intel_crtc(crtc);
 578
 579                 if (!crtc->state->active || !obj) {
 580                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 581                                       pipe_name(intel_crtc->pipe));
 582                         continue;
 583                 }
 584
 585                 if (obj->base.size > max_size) {
 586                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 587                                       pipe_name(intel_crtc->pipe));
 588                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 589                         max_size = obj->base.size;
 590                 }
 591         }
 592
 593         if (!fb) {
 594                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 595                 goto out;
 596         }
 597
 598         /* Now make sure all the pipes will fit into it */
 599         for_each_crtc(dev, crtc) {
 600                 unsigned int cur_size;
 601
 602                 intel_crtc = to_intel_crtc(crtc);
 603
 604                 if (!crtc->state->active) {
 605                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 606                                       pipe_name(intel_crtc->pipe));
 607                         continue;
 608                 }
 609
 610                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 611                               pipe_name(intel_crtc->pipe));
 612
 613                 /*
 614                  * See if the plane fb we found above will fit on this
 615                  * pipe.  Note we need to use the selected fb's pitch and bpp
 616                  * rather than the current pipe's, since they differ.
 617                  */
 618                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 619                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 620                 if (fb->base.pitches[0] < cur_size) {
 621                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 622                                       pipe_name(intel_crtc->pipe),
 623                                       cur_size, fb->base.pitches[0]);
 624                         fb = NULL;
 625                         break;
 626                 }
 627
 628                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 629                 cur_size = intel_fb_align_height(dev, cur_size,
 630                                                  fb->base.pixel_format,
 631                                                  fb->base.modifier[0]);
 632                 cur_size *= fb->base.pitches[0];
 633                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 634                               pipe_name(intel_crtc->pipe),
 635                               intel_crtc->config->base.adjusted_mode.crtc_hdisplay,
 636                               intel_crtc->config->base.adjusted_mode.crtc_vdisplay,
 637                               fb->base.bits_per_pixel,
 638                               cur_size);
 639
 640                 if (cur_size > max_size) {
 641                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 642                                       pipe_name(intel_crtc->pipe),
 643                                       cur_size, max_size);
 644                         fb = NULL;
 645                         break;
 646                 }
 647
 648                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 649                               pipe_name(intel_crtc->pipe),
 650                               max_size, cur_size);
 651         }
 652
 653         if (!fb) {
 654                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 655                 goto out;
 656         }
 657
 658         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 659         ifbdev->fb = fb;
 660
 661         drm_framebuffer_reference(&ifbdev->fb->base);
 662
 663         /* Final pass to check if any active pipes don't have fbs */
 664         for_each_crtc(dev, crtc) {
 665                 intel_crtc = to_intel_crtc(crtc);
 666
 667                 if (!crtc->state->active)
 668                         continue;
 669
 670                 WARN(!crtc->primary->fb,
 671                      "re-used BIOS config but lost an fb on crtc %d\n",
 672                      crtc->base.id);
 673         }
 674
 675
 676         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 677         return true;
 678
 679 out:
 680
 681         return false;
 682 }
 683
 684 static void intel_fbdev_suspend_worker(struct work_struct *work)
 685 {
 686         intel_fbdev_set_suspend(container_of(work,
 687                                              struct drm_i915_private,
 688                                              fbdev_suspend_work)->dev,
 689                                 FBINFO_STATE_RUNNING,
 690                                 true);
 691 }
 692
 693 int intel_fbdev_init(struct drm_device *dev)
 694 {
 695         struct intel_fbdev *ifbdev;
 696         struct drm_i915_private *dev_priv = dev->dev_private;
 697         int ret;
 698
 699         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 700                 return -ENODEV;
 701
 702         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 703         if (ifbdev == NULL)
 704                 return -ENOMEM;
 705
 706         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 707
 708         if (!intel_fbdev_init_bios(dev, ifbdev))
 709                 ifbdev->preferred_bpp = 32;
 710
 711         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 712                                  INTEL_INFO(dev)->num_pipes, 4);
 713         if (ret) {
 714                 kfree(ifbdev);
 715                 return ret;
 716         }
 717
 718         ifbdev->helper.atomic = true;
 719
 720         dev_priv->fbdev = ifbdev;
 721         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 722
 723         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 724
 725         return 0;
 726 }
 727
 728 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 729 {
 730         struct drm_i915_private *dev_priv = data;
 731         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 732
 733         /* Due to peculiar init order wrt to hpd handling this is separate. */
 734         if (drm_fb_helper_initial_config(&ifbdev->helper,
 735                                          ifbdev->preferred_bpp))
 736                 intel_fbdev_fini(dev_priv->dev);
 737 }
 738
 739 void intel_fbdev_initial_config_async(struct drm_device *dev)
 740 {
 741         async_schedule(intel_fbdev_initial_config, to_i915(dev));
 742 }
 743
 744 void intel_fbdev_fini(struct drm_device *dev)
 745 {
 746         struct drm_i915_private *dev_priv = dev->dev_private;
 747         if (!dev_priv->fbdev)
 748                 return;
 749
 750         flush_work(&dev_priv->fbdev_suspend_work);
 751
 752         if (!current_is_async())
 753                 async_synchronize_full();
 754         intel_fbdev_destroy(dev, dev_priv->fbdev);
 755         kfree(dev_priv->fbdev);
 756         dev_priv->fbdev = NULL;
 757 }
 758
 759 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 760 {
 761         struct drm_i915_private *dev_priv = dev->dev_private;
 762         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 763         struct fb_info *info;
 764
 765         if (!ifbdev)
 766                 return;
 767
 768         info = ifbdev->helper.fbdev;
 769
 770         if (synchronous) {
 771                 /* Flush any pending work to turn the console on, and then
 772                  * wait to turn it off. It must be synchronous as we are
 773                  * about to suspend or unload the driver.
 774                  *
 775                  * Note that from within the work-handler, we cannot flush
 776                  * ourselves, so only flush outstanding work upon suspend!
 777                  */
 778                 if (state != FBINFO_STATE_RUNNING)
 779                         flush_work(&dev_priv->fbdev_suspend_work);
 780                 console_lock();
 781         } else {
 782                 /*
 783                  * The console lock can be pretty contented on resume due
 784                  * to all the printk activity.  Try to keep it out of the hot
 785                  * path of resume if possible.
 786                  */
 787                 WARN_ON(state != FBINFO_STATE_RUNNING);
 788                 if (!console_trylock()) {
 789                         /* Don't block our own workqueue as this can
 790                          * be run in parallel with other i915.ko tasks.
 791                          */
 792                         schedule_work(&dev_priv->fbdev_suspend_work);
 793                         return;
 794                 }
 795         }
 796
 797         /* On resume from hibernation: If the object is shmemfs backed, it has
 798          * been restored from swap. If the object is stolen however, it will be
 799          * full of whatever garbage was left in there.
 800          */
 801         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 802                 memset_io(info->screen_base, 0, info->screen_size);
 803
 804         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 805         console_unlock();
 806 }
 807
 808 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 809 {
 810         struct drm_i915_private *dev_priv = dev->dev_private;
 811
 812         async_synchronize_full();
 813         if (dev_priv->fbdev)
 814                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 815 }
 816
 817 void intel_fbdev_restore_mode(struct drm_device *dev)
 818 {
 819         int ret;
 820         struct drm_i915_private *dev_priv = dev->dev_private;
 821         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 822         struct drm_fb_helper *fb_helper;
 823
 824         async_synchronize_full();
 825         if (!ifbdev)
 826                 return;
 827
 828         fb_helper = &ifbdev->helper;
 829
 830         ret = drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
 831         if (ret) {
 832                 DRM_DEBUG("failed to restore crtc mode\n");
 833         } else {
 834                 mutex_lock(&fb_helper->dev->struct_mutex);
 835                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 836                 mutex_unlock(&fb_helper->dev->struct_mutex);
 837         }
 838 }