drivers/gpu/drm/i915/intel_fbdev.c

   1 /*
   2  * Copyright © 2007 David Airlie
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *     David Airlie
  25  */
  26
  27 #include <linux/async.h>
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/console.h>
  31 #include <linux/errno.h>
  32 #include <linux/string.h>
  33 #include <linux/mm.h>
  34 #include <linux/tty.h>
  35 #include <linux/sysrq.h>
  36 #include <linux/delay.h>
  37 #include <linux/init.h>
  38 #include <linux/vga_switcheroo.h>
  39
  40 #include <drm/drm_crtc.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include <drm/drm_fourcc.h>
  43
  44 #include "intel_drv.h"
  45 #include "intel_frontbuffer.h"
  46 #include <drm/i915_drm.h>
  47 #include "i915_drv.h"
  48
  49 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  50 {
  51         struct drm_i915_gem_object *obj = intel_fb_obj(&ifbdev->fb->base);
  52         unsigned int origin =
  53                 ifbdev->vma_flags & PLANE_HAS_FENCE ? ORIGIN_GTT : ORIGIN_CPU;
  54
  55         intel_fb_obj_invalidate(obj, origin);
  56 }
  57
  58 static int intel_fbdev_set_par(struct fb_info *info)
  59 {
  60         struct drm_fb_helper *fb_helper = info->par;
  61         struct intel_fbdev *ifbdev =
  62                 container_of(fb_helper, struct intel_fbdev, helper);
  63         int ret;
  64
  65         ret = drm_fb_helper_set_par(info);
  66         if (ret == 0)
  67                 intel_fbdev_invalidate(ifbdev);
  68
  69         return ret;
  70 }
  71
  72 static int intel_fbdev_blank(int blank, struct fb_info *info)
  73 {
  74         struct drm_fb_helper *fb_helper = info->par;
  75         struct intel_fbdev *ifbdev =
  76                 container_of(fb_helper, struct intel_fbdev, helper);
  77         int ret;
  78
  79         ret = drm_fb_helper_blank(blank, info);
  80         if (ret == 0)
  81                 intel_fbdev_invalidate(ifbdev);
  82
  83         return ret;
  84 }
  85
  86 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  87                                    struct fb_info *info)
  88 {
  89         struct drm_fb_helper *fb_helper = info->par;
  90         struct intel_fbdev *ifbdev =
  91                 container_of(fb_helper, struct intel_fbdev, helper);
  92         int ret;
  93
  94         ret = drm_fb_helper_pan_display(var, info);
  95         if (ret == 0)
  96                 intel_fbdev_invalidate(ifbdev);
  97
  98         return ret;
  99 }
 100
 101 static struct fb_ops intelfb_ops = {
 102         .owner = THIS_MODULE,
 103         DRM_FB_HELPER_DEFAULT_OPS,
 104         .fb_set_par = intel_fbdev_set_par,
 105         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 106         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 107         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 108         .fb_pan_display = intel_fbdev_pan_display,
 109         .fb_blank = intel_fbdev_blank,
 110 };
 111
 112 static int intelfb_alloc(struct drm_fb_helper *helper,
 113                          struct drm_fb_helper_surface_size *sizes)
 114 {
 115         struct intel_fbdev *ifbdev =
 116                 container_of(helper, struct intel_fbdev, helper);
 117         struct drm_framebuffer *fb;
 118         struct drm_device *dev = helper->dev;
 119         struct drm_i915_private *dev_priv = to_i915(dev);
 120         struct drm_mode_fb_cmd2 mode_cmd = {};
 121         struct drm_i915_gem_object *obj;
 122         int size, ret;
 123
 124         /* we don't do packed 24bpp */
 125         if (sizes->surface_bpp == 24)
 126                 sizes->surface_bpp = 32;
 127
 128         mode_cmd.width = sizes->surface_width;
 129         mode_cmd.height = sizes->surface_height;
 130
 131         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 132                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 133         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 134                                                           sizes->surface_depth);
 135
 136         size = mode_cmd.pitches[0] * mode_cmd.height;
 137         size = PAGE_ALIGN(size);
 138
 139         /* If the FB is too big, just don't use it since fbdev is not very
 140          * important and we should probably use that space with FBC or other
 141          * features. */
 142         obj = NULL;
 143         if (size * 2 < dev_priv->stolen_usable_size)
 144                 obj = i915_gem_object_create_stolen(dev_priv, size);
 145         if (obj == NULL)
 146                 obj = i915_gem_object_create(dev_priv, size);
 147         if (IS_ERR(obj)) {
 148                 DRM_ERROR("failed to allocate framebuffer\n");
 149                 ret = PTR_ERR(obj);
 150                 goto err;
 151         }
 152
 153         fb = intel_framebuffer_create(obj, &mode_cmd);
 154         if (IS_ERR(fb)) {
 155                 ret = PTR_ERR(fb);
 156                 goto err_obj;
 157         }
 158
 159         ifbdev->fb = to_intel_framebuffer(fb);
 160
 161         return 0;
 162
 163 err_obj:
 164         i915_gem_object_put(obj);
 165 err:
 166         return ret;
 167 }
 168
 169 static int intelfb_create(struct drm_fb_helper *helper,
 170                           struct drm_fb_helper_surface_size *sizes)
 171 {
 172         struct intel_fbdev *ifbdev =
 173                 container_of(helper, struct intel_fbdev, helper);
 174         struct intel_framebuffer *intel_fb = ifbdev->fb;
 175         struct drm_device *dev = helper->dev;
 176         struct drm_i915_private *dev_priv = to_i915(dev);
 177         struct pci_dev *pdev = dev_priv->drm.pdev;
 178         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 179         const struct i915_ggtt_view view = {
 180                 .type = I915_GGTT_VIEW_NORMAL,
 181         };
 182         struct drm_framebuffer *fb;
 183         intel_wakeref_t wakeref;
 184         struct fb_info *info;
 185         struct i915_vma *vma;
 186         unsigned long flags = 0;
 187         bool prealloc = false;
 188         void __iomem *vaddr;
 189         int ret;
 190
 191         if (intel_fb &&
 192             (sizes->fb_width > intel_fb->base.width ||
 193              sizes->fb_height > intel_fb->base.height)) {
 194                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 195                               " releasing it\n",
 196                               intel_fb->base.width, intel_fb->base.height,
 197                               sizes->fb_width, sizes->fb_height);
 198                 drm_framebuffer_put(&intel_fb->base);
 199                 intel_fb = ifbdev->fb = NULL;
 200         }
 201         if (!intel_fb || WARN_ON(!intel_fb_obj(&intel_fb->base))) {
 202                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 203                 ret = intelfb_alloc(helper, sizes);
 204                 if (ret)
 205                         return ret;
 206                 intel_fb = ifbdev->fb;
 207         } else {
 208                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 209                 prealloc = true;
 210                 sizes->fb_width = intel_fb->base.width;
 211                 sizes->fb_height = intel_fb->base.height;
 212         }
 213
 214         mutex_lock(&dev->struct_mutex);
 215         wakeref = intel_runtime_pm_get(dev_priv);
 216
 217         /* Pin the GGTT vma for our access via info->screen_base.
 218          * This also validates that any existing fb inherited from the
 219          * BIOS is suitable for own access.
 220          */
 221         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base,
 222                                          &view, false, &flags);
 223         if (IS_ERR(vma)) {
 224                 ret = PTR_ERR(vma);
 225                 goto out_unlock;
 226         }
 227
 228         fb = &ifbdev->fb->base;
 229         intel_fb_obj_flush(intel_fb_obj(fb), ORIGIN_DIRTYFB);
 230
 231         info = drm_fb_helper_alloc_fbi(helper);
 232         if (IS_ERR(info)) {
 233                 DRM_ERROR("Failed to allocate fb_info\n");
 234                 ret = PTR_ERR(info);
 235                 goto out_unpin;
 236         }
 237
 238         info->par = helper;
 239
 240         ifbdev->helper.fb = fb;
 241
 242         strcpy(info->fix.id, "inteldrmfb");
 243
 244         info->fbops = &intelfb_ops;
 245
 246         /* setup aperture base/size for vesafb takeover */
 247         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 248         info->apertures->ranges[0].size = ggtt->mappable_end;
 249
 250         info->fix.smem_start = dev->mode_config.fb_base + i915_ggtt_offset(vma);
 251         info->fix.smem_len = vma->node.size;
 252
 253         vaddr = i915_vma_pin_iomap(vma);
 254         if (IS_ERR(vaddr)) {
 255                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 256                 ret = PTR_ERR(vaddr);
 257                 goto out_unpin;
 258         }
 259         info->screen_base = vaddr;
 260         info->screen_size = vma->node.size;
 261
 262         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 263         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 264
 265         /* If the object is shmemfs backed, it will have given us zeroed pages.
 266          * If the object is stolen however, it will be full of whatever
 267          * garbage was left in there.
 268          */
 269         if (intel_fb_obj(fb)->stolen && !prealloc)
 270                 memset_io(info->screen_base, 0, info->screen_size);
 271
 272         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 273
 274         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08x\n",
 275                       fb->width, fb->height, i915_ggtt_offset(vma));
 276         ifbdev->vma = vma;
 277         ifbdev->vma_flags = flags;
 278
 279         intel_runtime_pm_put(dev_priv, wakeref);
 280         mutex_unlock(&dev->struct_mutex);
 281         vga_switcheroo_client_fb_set(pdev, info);
 282         return 0;
 283
 284 out_unpin:
 285         intel_unpin_fb_vma(vma, flags);
 286 out_unlock:
 287         intel_runtime_pm_put(dev_priv, wakeref);
 288         mutex_unlock(&dev->struct_mutex);
 289         return ret;
 290 }
 291
 292 static struct drm_fb_helper_crtc *
 293 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 294 {
 295         int i;
 296
 297         for (i = 0; i < fb_helper->crtc_count; i++)
 298                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 299                         return &fb_helper->crtc_info[i];
 300
 301         return NULL;
 302 }
 303
 304 /*
 305  * Try to read the BIOS display configuration and use it for the initial
 306  * fb configuration.
 307  *
 308  * The BIOS or boot loader will generally create an initial display
 309  * configuration for us that includes some set of active pipes and displays.
 310  * This routine tries to figure out which pipes and connectors are active
 311  * and stuffs them into the crtcs and modes array given to us by the
 312  * drm_fb_helper code.
 313  *
 314  * The overall sequence is:
 315  *   intel_fbdev_init - from driver load
 316  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 317  *     drm_fb_helper_init - build fb helper structs
 318  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 319  *   intel_fbdev_initial_config - apply the config
 320  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 321  *         drm_setup_crtcs - build crtc config for fbdev
 322  *           intel_fb_initial_config - find active connectors etc
 323  *         drm_fb_helper_single_fb_probe - set up fbdev
 324  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 325  *
 326  * Note that we don't make special consideration whether we could actually
 327  * switch to the selected modes without a full modeset. E.g. when the display
 328  * is in VGA mode we need to recalculate watermarks and set a new high-res
 329  * framebuffer anyway.
 330  */
 331 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 332                                     struct drm_fb_helper_crtc **crtcs,
 333                                     struct drm_display_mode **modes,
 334                                     struct drm_fb_offset *offsets,
 335                                     bool *enabled, int width, int height)
 336 {
 337         struct drm_i915_private *dev_priv = to_i915(fb_helper->dev);
 338         unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
 339         unsigned long conn_configured, conn_seq;
 340         int i, j;
 341         bool *save_enabled;
 342         bool fallback = true, ret = true;
 343         int num_connectors_enabled = 0;
 344         int num_connectors_detected = 0;
 345         struct drm_modeset_acquire_ctx ctx;
 346
 347         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
 348         if (!save_enabled)
 349                 return false;
 350
 351         drm_modeset_acquire_init(&ctx, 0);
 352
 353         while (drm_modeset_lock_all_ctx(fb_helper->dev, &ctx) != 0)
 354                 drm_modeset_backoff(&ctx);
 355
 356         memcpy(save_enabled, enabled, count);
 357         conn_seq = GENMASK(count - 1, 0);
 358         conn_configured = 0;
 359 retry:
 360         for (i = 0; i < count; i++) {
 361                 struct drm_fb_helper_connector *fb_conn;
 362                 struct drm_connector *connector;
 363                 struct drm_encoder *encoder;
 364                 struct drm_fb_helper_crtc *new_crtc;
 365
 366                 fb_conn = fb_helper->connector_info[i];
 367                 connector = fb_conn->connector;
 368
 369                 if (conn_configured & BIT(i))
 370                         continue;
 371
 372                 /* First pass, only consider tiled connectors */
 373                 if (conn_seq == GENMASK(count - 1, 0) && !connector->has_tile)
 374                         continue;
 375
 376                 if (connector->status == connector_status_connected)
 377                         num_connectors_detected++;
 378
 379                 if (!enabled[i]) {
 380                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 381                                       connector->name);
 382                         conn_configured |= BIT(i);
 383                         continue;
 384                 }
 385
 386                 if (connector->force == DRM_FORCE_OFF) {
 387                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 388                                       connector->name);
 389                         enabled[i] = false;
 390                         continue;
 391                 }
 392
 393                 encoder = connector->state->best_encoder;
 394                 if (!encoder || WARN_ON(!connector->state->crtc)) {
 395                         if (connector->force > DRM_FORCE_OFF)
 396                                 goto bail;
 397
 398                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 399                                       connector->name);
 400                         enabled[i] = false;
 401                         conn_configured |= BIT(i);
 402                         continue;
 403                 }
 404
 405                 num_connectors_enabled++;
 406
 407                 new_crtc = intel_fb_helper_crtc(fb_helper,
 408                                                 connector->state->crtc);
 409
 410                 /*
 411                  * Make sure we're not trying to drive multiple connectors
 412                  * with a single CRTC, since our cloning support may not
 413                  * match the BIOS.
 414                  */
 415                 for (j = 0; j < count; j++) {
 416                         if (crtcs[j] == new_crtc) {
 417                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 418                                 goto bail;
 419                         }
 420                 }
 421
 422                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 423                               connector->name);
 424
 425                 /* go for command line mode first */
 426                 modes[i] = drm_pick_cmdline_mode(fb_conn);
 427
 428                 /* try for preferred next */
 429                 if (!modes[i]) {
 430                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 431                                       connector->name, connector->has_tile);
 432                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 433                                                           height);
 434                 }
 435
 436                 /* No preferred mode marked by the EDID? Are there any modes? */
 437                 if (!modes[i] && !list_empty(&connector->modes)) {
 438                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 439                                       connector->name);
 440                         modes[i] = list_first_entry(&connector->modes,
 441                                                     struct drm_display_mode,
 442                                                     head);
 443                 }
 444
 445                 /* last resort: use current mode */
 446                 if (!modes[i]) {
 447                         /*
 448                          * IMPORTANT: We want to use the adjusted mode (i.e.
 449                          * after the panel fitter upscaling) as the initial
 450                          * config, not the input mode, which is what crtc->mode
 451                          * usually contains. But since our current
 452                          * code puts a mode derived from the post-pfit timings
 453                          * into crtc->mode this works out correctly.
 454                          *
 455                          * This is crtc->mode and not crtc->state->mode for the
 456                          * fastboot check to work correctly. crtc_state->mode has
 457                          * I915_MODE_FLAG_INHERITED, which we clear to force check
 458                          * state.
 459                          */
 460                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 461                                       connector->name);
 462                         modes[i] = &connector->state->crtc->mode;
 463                 }
 464                 crtcs[i] = new_crtc;
 465
 466                 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
 467                               connector->name,
 468                               connector->state->crtc->base.id,
 469                               connector->state->crtc->name,
 470                               modes[i]->hdisplay, modes[i]->vdisplay,
 471                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 472
 473                 fallback = false;
 474                 conn_configured |= BIT(i);
 475         }
 476
 477         if (conn_configured != conn_seq) { /* repeat until no more are found */
 478                 conn_seq = conn_configured;
 479                 goto retry;
 480         }
 481
 482         /*
 483          * If the BIOS didn't enable everything it could, fall back to have the
 484          * same user experiencing of lighting up as much as possible like the
 485          * fbdev helper library.
 486          */
 487         if (num_connectors_enabled != num_connectors_detected &&
 488             num_connectors_enabled < INTEL_INFO(dev_priv)->num_pipes) {
 489                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 490                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 491                               num_connectors_detected);
 492                 fallback = true;
 493         }
 494
 495         if (fallback) {
 496 bail:
 497                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 498                 memcpy(enabled, save_enabled, count);
 499                 ret = false;
 500         }
 501
 502         drm_modeset_drop_locks(&ctx);
 503         drm_modeset_acquire_fini(&ctx);
 504
 505         kfree(save_enabled);
 506         return ret;
 507 }
 508
 509 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 510         .initial_config = intel_fb_initial_config,
 511         .fb_probe = intelfb_create,
 512 };
 513
 514 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 515 {
 516         /* We rely on the object-free to release the VMA pinning for
 517          * the info->screen_base mmaping. Leaking the VMA is simpler than
 518          * trying to rectify all the possible error paths leading here.
 519          */
 520
 521         drm_fb_helper_fini(&ifbdev->helper);
 522
 523         if (ifbdev->vma) {
 524                 mutex_lock(&ifbdev->helper.dev->struct_mutex);
 525                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 526                 mutex_unlock(&ifbdev->helper.dev->struct_mutex);
 527         }
 528
 529         if (ifbdev->fb)
 530                 drm_framebuffer_remove(&ifbdev->fb->base);
 531
 532         kfree(ifbdev);
 533 }
 534
 535 /*
 536  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 537  * The core display code will have read out the current plane configuration,
 538  * so we use that to figure out if there's an object for us to use as the
 539  * fb, and if so, we re-use it for the fbdev configuration.
 540  *
 541  * Note we only support a single fb shared across pipes for boot (mostly for
 542  * fbcon), so we just find the biggest and use that.
 543  */
 544 static bool intel_fbdev_init_bios(struct drm_device *dev,
 545                                  struct intel_fbdev *ifbdev)
 546 {
 547         struct intel_framebuffer *fb = NULL;
 548         struct drm_crtc *crtc;
 549         struct intel_crtc *intel_crtc;
 550         unsigned int max_size = 0;
 551
 552         /* Find the largest fb */
 553         for_each_crtc(dev, crtc) {
 554                 struct drm_i915_gem_object *obj =
 555                         intel_fb_obj(crtc->primary->state->fb);
 556                 intel_crtc = to_intel_crtc(crtc);
 557
 558                 if (!crtc->state->active || !obj) {
 559                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 560                                       pipe_name(intel_crtc->pipe));
 561                         continue;
 562                 }
 563
 564                 if (obj->base.size > max_size) {
 565                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 566                                       pipe_name(intel_crtc->pipe));
 567                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 568                         max_size = obj->base.size;
 569                 }
 570         }
 571
 572         if (!fb) {
 573                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 574                 goto out;
 575         }
 576
 577         /* Now make sure all the pipes will fit into it */
 578         for_each_crtc(dev, crtc) {
 579                 unsigned int cur_size;
 580
 581                 intel_crtc = to_intel_crtc(crtc);
 582
 583                 if (!crtc->state->active) {
 584                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 585                                       pipe_name(intel_crtc->pipe));
 586                         continue;
 587                 }
 588
 589                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 590                               pipe_name(intel_crtc->pipe));
 591
 592                 /*
 593                  * See if the plane fb we found above will fit on this
 594                  * pipe.  Note we need to use the selected fb's pitch and bpp
 595                  * rather than the current pipe's, since they differ.
 596                  */
 597                 cur_size = crtc->state->adjusted_mode.crtc_hdisplay;
 598                 cur_size = cur_size * fb->base.format->cpp[0];
 599                 if (fb->base.pitches[0] < cur_size) {
 600                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 601                                       pipe_name(intel_crtc->pipe),
 602                                       cur_size, fb->base.pitches[0]);
 603                         fb = NULL;
 604                         break;
 605                 }
 606
 607                 cur_size = crtc->state->adjusted_mode.crtc_vdisplay;
 608                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 609                 cur_size *= fb->base.pitches[0];
 610                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 611                               pipe_name(intel_crtc->pipe),
 612                               crtc->state->adjusted_mode.crtc_hdisplay,
 613                               crtc->state->adjusted_mode.crtc_vdisplay,
 614                               fb->base.format->cpp[0] * 8,
 615                               cur_size);
 616
 617                 if (cur_size > max_size) {
 618                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 619                                       pipe_name(intel_crtc->pipe),
 620                                       cur_size, max_size);
 621                         fb = NULL;
 622                         break;
 623                 }
 624
 625                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 626                               pipe_name(intel_crtc->pipe),
 627                               max_size, cur_size);
 628         }
 629
 630         if (!fb) {
 631                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 632                 goto out;
 633         }
 634
 635         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 636         ifbdev->fb = fb;
 637
 638         drm_framebuffer_get(&ifbdev->fb->base);
 639
 640         /* Final pass to check if any active pipes don't have fbs */
 641         for_each_crtc(dev, crtc) {
 642                 intel_crtc = to_intel_crtc(crtc);
 643
 644                 if (!crtc->state->active)
 645                         continue;
 646
 647                 WARN(!crtc->primary->state->fb,
 648                      "re-used BIOS config but lost an fb on crtc %d\n",
 649                      crtc->base.id);
 650         }
 651
 652
 653         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 654         return true;
 655
 656 out:
 657
 658         return false;
 659 }
 660
 661 static void intel_fbdev_suspend_worker(struct work_struct *work)
 662 {
 663         intel_fbdev_set_suspend(&container_of(work,
 664                                               struct drm_i915_private,
 665                                               fbdev_suspend_work)->drm,
 666                                 FBINFO_STATE_RUNNING,
 667                                 true);
 668 }
 669
 670 int intel_fbdev_init(struct drm_device *dev)
 671 {
 672         struct drm_i915_private *dev_priv = to_i915(dev);
 673         struct intel_fbdev *ifbdev;
 674         int ret;
 675
 676         if (WARN_ON(!HAS_DISPLAY(dev_priv)))
 677                 return -ENODEV;
 678
 679         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 680         if (ifbdev == NULL)
 681                 return -ENOMEM;
 682
 683         mutex_init(&ifbdev->hpd_lock);
 684         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 685
 686         if (!intel_fbdev_init_bios(dev, ifbdev))
 687                 ifbdev->preferred_bpp = 32;
 688
 689         ret = drm_fb_helper_init(dev, &ifbdev->helper, 4);
 690         if (ret) {
 691                 kfree(ifbdev);
 692                 return ret;
 693         }
 694
 695         dev_priv->fbdev = ifbdev;
 696         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 697
 698         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 699
 700         return 0;
 701 }
 702
 703 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 704 {
 705         struct intel_fbdev *ifbdev = data;
 706
 707         /* Due to peculiar init order wrt to hpd handling this is separate. */
 708         if (drm_fb_helper_initial_config(&ifbdev->helper,
 709                                          ifbdev->preferred_bpp))
 710                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 711 }
 712
 713 void intel_fbdev_initial_config_async(struct drm_device *dev)
 714 {
 715         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 716
 717         if (!ifbdev)
 718                 return;
 719
 720         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 721 }
 722
 723 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 724 {
 725         if (!ifbdev->cookie)
 726                 return;
 727
 728         /* Only serialises with all preceding async calls, hence +1 */
 729         async_synchronize_cookie(ifbdev->cookie + 1);
 730         ifbdev->cookie = 0;
 731 }
 732
 733 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 734 {
 735         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 736
 737         if (!ifbdev)
 738                 return;
 739
 740         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 741         if (!current_is_async())
 742                 intel_fbdev_sync(ifbdev);
 743
 744         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 745 }
 746
 747 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 748 {
 749         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->fbdev);
 750
 751         if (!ifbdev)
 752                 return;
 753
 754         intel_fbdev_destroy(ifbdev);
 755 }
 756
 757 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 758  * processing, fbdev will perform a full connector reprobe if a hotplug event
 759  * was received while HPD was suspended.
 760  */
 761 static void intel_fbdev_hpd_set_suspend(struct intel_fbdev *ifbdev, int state)
 762 {
 763         bool send_hpd = false;
 764
 765         mutex_lock(&ifbdev->hpd_lock);
 766         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 767         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 768         ifbdev->hpd_waiting = false;
 769         mutex_unlock(&ifbdev->hpd_lock);
 770
 771         if (send_hpd) {
 772                 DRM_DEBUG_KMS("Handling delayed fbcon HPD event\n");
 773                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 774         }
 775 }
 776
 777 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 778 {
 779         struct drm_i915_private *dev_priv = to_i915(dev);
 780         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 781         struct fb_info *info;
 782
 783         if (!ifbdev || !ifbdev->vma)
 784                 return;
 785
 786         info = ifbdev->helper.fbdev;
 787
 788         if (synchronous) {
 789                 /* Flush any pending work to turn the console on, and then
 790                  * wait to turn it off. It must be synchronous as we are
 791                  * about to suspend or unload the driver.
 792                  *
 793                  * Note that from within the work-handler, we cannot flush
 794                  * ourselves, so only flush outstanding work upon suspend!
 795                  */
 796                 if (state != FBINFO_STATE_RUNNING)
 797                         flush_work(&dev_priv->fbdev_suspend_work);
 798
 799                 console_lock();
 800         } else {
 801                 /*
 802                  * The console lock can be pretty contented on resume due
 803                  * to all the printk activity.  Try to keep it out of the hot
 804                  * path of resume if possible.
 805                  */
 806                 WARN_ON(state != FBINFO_STATE_RUNNING);
 807                 if (!console_trylock()) {
 808                         /* Don't block our own workqueue as this can
 809                          * be run in parallel with other i915.ko tasks.
 810                          */
 811                         schedule_work(&dev_priv->fbdev_suspend_work);
 812                         return;
 813                 }
 814         }
 815
 816         /* On resume from hibernation: If the object is shmemfs backed, it has
 817          * been restored from swap. If the object is stolen however, it will be
 818          * full of whatever garbage was left in there.
 819          */
 820         if (state == FBINFO_STATE_RUNNING &&
 821             intel_fb_obj(&ifbdev->fb->base)->stolen)
 822                 memset_io(info->screen_base, 0, info->screen_size);
 823
 824         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 825         console_unlock();
 826
 827         intel_fbdev_hpd_set_suspend(ifbdev, state);
 828 }
 829
 830 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 831 {
 832         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 833         bool send_hpd;
 834
 835         if (!ifbdev)
 836                 return;
 837
 838         intel_fbdev_sync(ifbdev);
 839
 840         mutex_lock(&ifbdev->hpd_lock);
 841         send_hpd = !ifbdev->hpd_suspended;
 842         ifbdev->hpd_waiting = true;
 843         mutex_unlock(&ifbdev->hpd_lock);
 844
 845         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 846                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 847 }
 848
 849 void intel_fbdev_restore_mode(struct drm_device *dev)
 850 {
 851         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 852
 853         if (!ifbdev)
 854                 return;
 855
 856         intel_fbdev_sync(ifbdev);
 857         if (!ifbdev->vma)
 858                 return;
 859
 860         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 861                 intel_fbdev_invalidate(ifbdev);
 862 }