drivers/gpu/drm/i915/display/intel_fbdev.c

   1 /*
   2  * Copyright © 2007 David Airlie
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *     David Airlie
  25  */
  26
  27 #include <linux/async.h>
  28 #include <linux/console.h>
  29 #include <linux/delay.h>
  30 #include <linux/errno.h>
  31 #include <linux/init.h>
  32 #include <linux/kernel.h>
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/string.h>
  36 #include <linux/sysrq.h>
  37 #include <linux/tty.h>
  38 #include <linux/vga_switcheroo.h>
  39
  40 #include <drm/drm_crtc.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include <drm/drm_fourcc.h>
  43 #include <drm/drm_gem_framebuffer_helper.h>
  44
  45 #include "gem/i915_gem_lmem.h"
  46 #include "gem/i915_gem_mman.h"
  47
  48 #include "i915_drv.h"
  49 #include "intel_display_types.h"
  50 #include "intel_fb.h"
  51 #include "intel_fb_pin.h"
  52 #include "intel_fbdev.h"
  53 #include "intel_frontbuffer.h"
  54
  55 struct intel_fbdev {
  56         struct drm_fb_helper helper;
  57         struct intel_framebuffer *fb;
  58         struct i915_vma *vma;
  59         unsigned long vma_flags;
  60         async_cookie_t cookie;
  61         int preferred_bpp;
  62
  63         /* Whether or not fbdev hpd processing is temporarily suspended */
  64         bool hpd_suspended: 1;
  65         /* Set when a hotplug was received while HPD processing was suspended */
  66         bool hpd_waiting: 1;
  67
  68         /* Protects hpd_suspended */
  69         struct mutex hpd_lock;
  70 };
  71
  72 static struct intel_fbdev *to_intel_fbdev(struct drm_fb_helper *fb_helper)
  73 {
  74         return container_of(fb_helper, struct intel_fbdev, helper);
  75 }
  76
  77 static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
  78 {
  79         return ifbdev->fb->frontbuffer;
  80 }
  81
  82 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  83 {
  84         intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
  85 }
  86
  87 static int intel_fbdev_set_par(struct fb_info *info)
  88 {
  89         struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
  90         int ret;
  91
  92         ret = drm_fb_helper_set_par(info);
  93         if (ret == 0)
  94                 intel_fbdev_invalidate(ifbdev);
  95
  96         return ret;
  97 }
  98
  99 static int intel_fbdev_blank(int blank, struct fb_info *info)
 100 {
 101         struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
 102         int ret;
 103
 104         ret = drm_fb_helper_blank(blank, info);
 105         if (ret == 0)
 106                 intel_fbdev_invalidate(ifbdev);
 107
 108         return ret;
 109 }
 110
 111 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
 112                                    struct fb_info *info)
 113 {
 114         struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
 115         int ret;
 116
 117         ret = drm_fb_helper_pan_display(var, info);
 118         if (ret == 0)
 119                 intel_fbdev_invalidate(ifbdev);
 120
 121         return ret;
 122 }
 123
 124 static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
 125 {
 126         struct intel_fbdev *fbdev = to_intel_fbdev(info->par);
 127         struct drm_gem_object *bo = drm_gem_fb_get_obj(&fbdev->fb->base, 0);
 128         struct drm_i915_gem_object *obj = to_intel_bo(bo);
 129
 130         return i915_gem_fb_mmap(obj, vma);
 131 }
 132
 133 static const struct fb_ops intelfb_ops = {
 134         .owner = THIS_MODULE,
 135         DRM_FB_HELPER_DEFAULT_OPS,
 136         .fb_set_par = intel_fbdev_set_par,
 137         .fb_read = drm_fb_helper_cfb_read,
 138         .fb_write = drm_fb_helper_cfb_write,
 139         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 140         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 141         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 142         .fb_pan_display = intel_fbdev_pan_display,
 143         .fb_blank = intel_fbdev_blank,
 144         .fb_mmap = intel_fbdev_mmap,
 145 };
 146
 147 static int intelfb_alloc(struct drm_fb_helper *helper,
 148                          struct drm_fb_helper_surface_size *sizes)
 149 {
 150         struct intel_fbdev *ifbdev = to_intel_fbdev(helper);
 151         struct drm_framebuffer *fb;
 152         struct drm_device *dev = helper->dev;
 153         struct drm_i915_private *dev_priv = to_i915(dev);
 154         struct drm_mode_fb_cmd2 mode_cmd = {};
 155         struct drm_i915_gem_object *obj;
 156         int size;
 157
 158         /* we don't do packed 24bpp */
 159         if (sizes->surface_bpp == 24)
 160                 sizes->surface_bpp = 32;
 161
 162         mode_cmd.width = sizes->surface_width;
 163         mode_cmd.height = sizes->surface_height;
 164
 165         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 166                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 167         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 168                                                           sizes->surface_depth);
 169
 170         size = mode_cmd.pitches[0] * mode_cmd.height;
 171         size = PAGE_ALIGN(size);
 172
 173         obj = ERR_PTR(-ENODEV);
 174         if (HAS_LMEM(dev_priv)) {
 175                 obj = i915_gem_object_create_lmem(dev_priv, size,
 176                                                   I915_BO_ALLOC_CONTIGUOUS |
 177                                                   I915_BO_ALLOC_USER);
 178         } else {
 179                 /*
 180                  * If the FB is too big, just don't use it since fbdev is not very
 181                  * important and we should probably use that space with FBC or other
 182                  * features.
 183                  */
 184                 if (size * 2 < dev_priv->stolen_usable_size)
 185                         obj = i915_gem_object_create_stolen(dev_priv, size);
 186                 if (IS_ERR(obj))
 187                         obj = i915_gem_object_create_shmem(dev_priv, size);
 188         }
 189
 190         if (IS_ERR(obj)) {
 191                 drm_err(&dev_priv->drm, "failed to allocate framebuffer (%pe)\n", obj);
 192                 return PTR_ERR(obj);
 193         }
 194
 195         fb = intel_framebuffer_create(obj, &mode_cmd);
 196         i915_gem_object_put(obj);
 197         if (IS_ERR(fb))
 198                 return PTR_ERR(fb);
 199
 200         ifbdev->fb = to_intel_framebuffer(fb);
 201         return 0;
 202 }
 203
 204 static int intelfb_create(struct drm_fb_helper *helper,
 205                           struct drm_fb_helper_surface_size *sizes)
 206 {
 207         struct intel_fbdev *ifbdev = to_intel_fbdev(helper);
 208         struct intel_framebuffer *intel_fb = ifbdev->fb;
 209         struct drm_device *dev = helper->dev;
 210         struct drm_i915_private *dev_priv = to_i915(dev);
 211         struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 212         struct i915_ggtt *ggtt = to_gt(dev_priv)->ggtt;
 213         const struct i915_gtt_view view = {
 214                 .type = I915_GTT_VIEW_NORMAL,
 215         };
 216         intel_wakeref_t wakeref;
 217         struct fb_info *info;
 218         struct i915_vma *vma;
 219         unsigned long flags = 0;
 220         bool prealloc = false;
 221         void __iomem *vaddr;
 222         struct drm_i915_gem_object *obj;
 223         int ret;
 224
 225         mutex_lock(&ifbdev->hpd_lock);
 226         ret = ifbdev->hpd_suspended ? -EAGAIN : 0;
 227         mutex_unlock(&ifbdev->hpd_lock);
 228         if (ret)
 229                 return ret;
 230
 231         if (intel_fb &&
 232             (sizes->fb_width > intel_fb->base.width ||
 233              sizes->fb_height > intel_fb->base.height)) {
 234                 drm_dbg_kms(&dev_priv->drm,
 235                             "BIOS fb too small (%dx%d), we require (%dx%d),"
 236                             " releasing it\n",
 237                             intel_fb->base.width, intel_fb->base.height,
 238                             sizes->fb_width, sizes->fb_height);
 239                 drm_framebuffer_put(&intel_fb->base);
 240                 intel_fb = ifbdev->fb = NULL;
 241         }
 242         if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
 243                 drm_dbg_kms(&dev_priv->drm,
 244                             "no BIOS fb, allocating a new one\n");
 245                 ret = intelfb_alloc(helper, sizes);
 246                 if (ret)
 247                         return ret;
 248                 intel_fb = ifbdev->fb;
 249         } else {
 250                 drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
 251                 prealloc = true;
 252                 sizes->fb_width = intel_fb->base.width;
 253                 sizes->fb_height = intel_fb->base.height;
 254         }
 255
 256         wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
 257
 258         /* Pin the GGTT vma for our access via info->screen_base.
 259          * This also validates that any existing fb inherited from the
 260          * BIOS is suitable for own access.
 261          */
 262         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, false,
 263                                          &view, false, &flags);
 264         if (IS_ERR(vma)) {
 265                 ret = PTR_ERR(vma);
 266                 goto out_unlock;
 267         }
 268
 269         info = drm_fb_helper_alloc_info(helper);
 270         if (IS_ERR(info)) {
 271                 drm_err(&dev_priv->drm, "Failed to allocate fb_info (%pe)\n", info);
 272                 ret = PTR_ERR(info);
 273                 goto out_unpin;
 274         }
 275
 276         ifbdev->helper.fb = &ifbdev->fb->base;
 277
 278         info->fbops = &intelfb_ops;
 279
 280         /* setup aperture base/size for vesafb takeover */
 281         obj = intel_fb_obj(&intel_fb->base);
 282         if (i915_gem_object_is_lmem(obj)) {
 283                 struct intel_memory_region *mem = obj->mm.region;
 284
 285                 info->apertures->ranges[0].base = mem->io_start;
 286                 info->apertures->ranges[0].size = mem->io_size;
 287
 288                 /* Use fbdev's framebuffer from lmem for discrete */
 289                 info->fix.smem_start =
 290                         (unsigned long)(mem->io_start +
 291                                         i915_gem_object_get_dma_address(obj, 0));
 292                 info->fix.smem_len = obj->base.size;
 293         } else {
 294                 info->apertures->ranges[0].base = ggtt->gmadr.start;
 295                 info->apertures->ranges[0].size = ggtt->mappable_end;
 296
 297                 /* Our framebuffer is the entirety of fbdev's system memory */
 298                 info->fix.smem_start =
 299                         (unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma));
 300                 info->fix.smem_len = vma->size;
 301         }
 302
 303         vaddr = i915_vma_pin_iomap(vma);
 304         if (IS_ERR(vaddr)) {
 305                 drm_err(&dev_priv->drm,
 306                         "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr);
 307                 ret = PTR_ERR(vaddr);
 308                 goto out_unpin;
 309         }
 310         info->screen_base = vaddr;
 311         info->screen_size = vma->size;
 312
 313         drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 314
 315         /* If the object is shmemfs backed, it will have given us zeroed pages.
 316          * If the object is stolen however, it will be full of whatever
 317          * garbage was left in there.
 318          */
 319         if (!i915_gem_object_is_shmem(vma->obj) && !prealloc)
 320                 memset_io(info->screen_base, 0, info->screen_size);
 321
 322         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 323
 324         drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
 325                     ifbdev->fb->base.width, ifbdev->fb->base.height,
 326                     i915_ggtt_offset(vma));
 327         ifbdev->vma = vma;
 328         ifbdev->vma_flags = flags;
 329
 330         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 331         vga_switcheroo_client_fb_set(pdev, info);
 332         return 0;
 333
 334 out_unpin:
 335         intel_unpin_fb_vma(vma, flags);
 336 out_unlock:
 337         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 338         return ret;
 339 }
 340
 341 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 342         .fb_probe = intelfb_create,
 343 };
 344
 345 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 346 {
 347         /* We rely on the object-free to release the VMA pinning for
 348          * the info->screen_base mmaping. Leaking the VMA is simpler than
 349          * trying to rectify all the possible error paths leading here.
 350          */
 351
 352         drm_fb_helper_fini(&ifbdev->helper);
 353
 354         if (ifbdev->vma)
 355                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 356
 357         if (ifbdev->fb)
 358                 drm_framebuffer_remove(&ifbdev->fb->base);
 359
 360         kfree(ifbdev);
 361 }
 362
 363 /*
 364  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 365  * The core display code will have read out the current plane configuration,
 366  * so we use that to figure out if there's an object for us to use as the
 367  * fb, and if so, we re-use it for the fbdev configuration.
 368  *
 369  * Note we only support a single fb shared across pipes for boot (mostly for
 370  * fbcon), so we just find the biggest and use that.
 371  */
 372 static bool intel_fbdev_init_bios(struct drm_device *dev,
 373                                   struct intel_fbdev *ifbdev)
 374 {
 375         struct drm_i915_private *i915 = to_i915(dev);
 376         struct intel_framebuffer *fb = NULL;
 377         struct intel_crtc *crtc;
 378         unsigned int max_size = 0;
 379
 380         /* Find the largest fb */
 381         for_each_intel_crtc(dev, crtc) {
 382                 struct intel_crtc_state *crtc_state =
 383                         to_intel_crtc_state(crtc->base.state);
 384                 struct intel_plane *plane =
 385                         to_intel_plane(crtc->base.primary);
 386                 struct intel_plane_state *plane_state =
 387                         to_intel_plane_state(plane->base.state);
 388                 struct drm_i915_gem_object *obj =
 389                         intel_fb_obj(plane_state->uapi.fb);
 390
 391                 if (!crtc_state->uapi.active) {
 392                         drm_dbg_kms(&i915->drm,
 393                                     "[CRTC:%d:%s] not active, skipping\n",
 394                                     crtc->base.base.id, crtc->base.name);
 395                         continue;
 396                 }
 397
 398                 if (!obj) {
 399                         drm_dbg_kms(&i915->drm,
 400                                     "[PLANE:%d:%s] no fb, skipping\n",
 401                                     plane->base.base.id, plane->base.name);
 402                         continue;
 403                 }
 404
 405                 if (obj->base.size > max_size) {
 406                         drm_dbg_kms(&i915->drm,
 407                                     "found possible fb from [PLANE:%d:%s]\n",
 408                                     plane->base.base.id, plane->base.name);
 409                         fb = to_intel_framebuffer(plane_state->uapi.fb);
 410                         max_size = obj->base.size;
 411                 }
 412         }
 413
 414         if (!fb) {
 415                 drm_dbg_kms(&i915->drm,
 416                             "no active fbs found, not using BIOS config\n");
 417                 goto out;
 418         }
 419
 420         /* Now make sure all the pipes will fit into it */
 421         for_each_intel_crtc(dev, crtc) {
 422                 struct intel_crtc_state *crtc_state =
 423                         to_intel_crtc_state(crtc->base.state);
 424                 struct intel_plane *plane =
 425                         to_intel_plane(crtc->base.primary);
 426                 unsigned int cur_size;
 427
 428                 if (!crtc_state->uapi.active) {
 429                         drm_dbg_kms(&i915->drm,
 430                                     "[CRTC:%d:%s] not active, skipping\n",
 431                                     crtc->base.base.id, crtc->base.name);
 432                         continue;
 433                 }
 434
 435                 drm_dbg_kms(&i915->drm, "checking [PLANE:%d:%s] for BIOS fb\n",
 436                             plane->base.base.id, plane->base.name);
 437
 438                 /*
 439                  * See if the plane fb we found above will fit on this
 440                  * pipe.  Note we need to use the selected fb's pitch and bpp
 441                  * rather than the current pipe's, since they differ.
 442                  */
 443                 cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay;
 444                 cur_size = cur_size * fb->base.format->cpp[0];
 445                 if (fb->base.pitches[0] < cur_size) {
 446                         drm_dbg_kms(&i915->drm,
 447                                     "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n",
 448                                     plane->base.base.id, plane->base.name,
 449                                     cur_size, fb->base.pitches[0]);
 450                         fb = NULL;
 451                         break;
 452                 }
 453
 454                 cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay;
 455                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 456                 cur_size *= fb->base.pitches[0];
 457                 drm_dbg_kms(&i915->drm,
 458                             "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n",
 459                             crtc->base.base.id, crtc->base.name,
 460                             crtc_state->uapi.adjusted_mode.crtc_hdisplay,
 461                             crtc_state->uapi.adjusted_mode.crtc_vdisplay,
 462                             fb->base.format->cpp[0] * 8,
 463                             cur_size);
 464
 465                 if (cur_size > max_size) {
 466                         drm_dbg_kms(&i915->drm,
 467                                     "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n",
 468                                     plane->base.base.id, plane->base.name,
 469                                     cur_size, max_size);
 470                         fb = NULL;
 471                         break;
 472                 }
 473
 474                 drm_dbg_kms(&i915->drm,
 475                             "fb big enough [PLANE:%d:%s] (%d >= %d)\n",
 476                             plane->base.base.id, plane->base.name,
 477                             max_size, cur_size);
 478         }
 479
 480         if (!fb) {
 481                 drm_dbg_kms(&i915->drm,
 482                             "BIOS fb not suitable for all pipes, not using\n");
 483                 goto out;
 484         }
 485
 486         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 487         ifbdev->fb = fb;
 488
 489         drm_framebuffer_get(&ifbdev->fb->base);
 490
 491         /* Final pass to check if any active pipes don't have fbs */
 492         for_each_intel_crtc(dev, crtc) {
 493                 struct intel_crtc_state *crtc_state =
 494                         to_intel_crtc_state(crtc->base.state);
 495                 struct intel_plane *plane =
 496                         to_intel_plane(crtc->base.primary);
 497                 struct intel_plane_state *plane_state =
 498                         to_intel_plane_state(plane->base.state);
 499
 500                 if (!crtc_state->uapi.active)
 501                         continue;
 502
 503                 drm_WARN(dev, !plane_state->uapi.fb,
 504                          "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n",
 505                          plane->base.base.id, plane->base.name);
 506         }
 507
 508
 509         drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n");
 510         return true;
 511
 512 out:
 513
 514         return false;
 515 }
 516
 517 static void intel_fbdev_suspend_worker(struct work_struct *work)
 518 {
 519         intel_fbdev_set_suspend(&container_of(work,
 520                                               struct drm_i915_private,
 521                                               display.fbdev.suspend_work)->drm,
 522                                 FBINFO_STATE_RUNNING,
 523                                 true);
 524 }
 525
 526 int intel_fbdev_init(struct drm_device *dev)
 527 {
 528         struct drm_i915_private *dev_priv = to_i915(dev);
 529         struct intel_fbdev *ifbdev;
 530         int ret;
 531
 532         if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
 533                 return -ENODEV;
 534
 535         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 536         if (ifbdev == NULL)
 537                 return -ENOMEM;
 538
 539         mutex_init(&ifbdev->hpd_lock);
 540         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 541
 542         if (!intel_fbdev_init_bios(dev, ifbdev))
 543                 ifbdev->preferred_bpp = 32;
 544
 545         ret = drm_fb_helper_init(dev, &ifbdev->helper);
 546         if (ret) {
 547                 kfree(ifbdev);
 548                 return ret;
 549         }
 550
 551         dev_priv->display.fbdev.fbdev = ifbdev;
 552         INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
 553
 554         return 0;
 555 }
 556
 557 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 558 {
 559         struct intel_fbdev *ifbdev = data;
 560
 561         /* Due to peculiar init order wrt to hpd handling this is separate. */
 562         if (drm_fb_helper_initial_config(&ifbdev->helper,
 563                                          ifbdev->preferred_bpp))
 564                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 565 }
 566
 567 void intel_fbdev_initial_config_async(struct drm_device *dev)
 568 {
 569         struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 570
 571         if (!ifbdev)
 572                 return;
 573
 574         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 575 }
 576
 577 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 578 {
 579         if (!ifbdev->cookie)
 580                 return;
 581
 582         /* Only serialises with all preceding async calls, hence +1 */
 583         async_synchronize_cookie(ifbdev->cookie + 1);
 584         ifbdev->cookie = 0;
 585 }
 586
 587 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 588 {
 589         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 590
 591         if (!ifbdev)
 592                 return;
 593
 594         intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true);
 595
 596         if (!current_is_async())
 597                 intel_fbdev_sync(ifbdev);
 598
 599         drm_fb_helper_unregister_info(&ifbdev->helper);
 600 }
 601
 602 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 603 {
 604         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev);
 605
 606         if (!ifbdev)
 607                 return;
 608
 609         intel_fbdev_destroy(ifbdev);
 610 }
 611
 612 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 613  * processing, fbdev will perform a full connector reprobe if a hotplug event
 614  * was received while HPD was suspended.
 615  */
 616 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
 617 {
 618         struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev;
 619         bool send_hpd = false;
 620
 621         mutex_lock(&ifbdev->hpd_lock);
 622         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 623         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 624         ifbdev->hpd_waiting = false;
 625         mutex_unlock(&ifbdev->hpd_lock);
 626
 627         if (send_hpd) {
 628                 drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
 629                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 630         }
 631 }
 632
 633 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 634 {
 635         struct drm_i915_private *dev_priv = to_i915(dev);
 636         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 637         struct fb_info *info;
 638
 639         if (!ifbdev || !ifbdev->vma)
 640                 goto set_suspend;
 641
 642         info = ifbdev->helper.info;
 643
 644         if (synchronous) {
 645                 /* Flush any pending work to turn the console on, and then
 646                  * wait to turn it off. It must be synchronous as we are
 647                  * about to suspend or unload the driver.
 648                  *
 649                  * Note that from within the work-handler, we cannot flush
 650                  * ourselves, so only flush outstanding work upon suspend!
 651                  */
 652                 if (state != FBINFO_STATE_RUNNING)
 653                         flush_work(&dev_priv->display.fbdev.suspend_work);
 654
 655                 console_lock();
 656         } else {
 657                 /*
 658                  * The console lock can be pretty contented on resume due
 659                  * to all the printk activity.  Try to keep it out of the hot
 660                  * path of resume if possible.
 661                  */
 662                 drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
 663                 if (!console_trylock()) {
 664                         /* Don't block our own workqueue as this can
 665                          * be run in parallel with other i915.ko tasks.
 666                          */
 667                         schedule_work(&dev_priv->display.fbdev.suspend_work);
 668                         return;
 669                 }
 670         }
 671
 672         /* On resume from hibernation: If the object is shmemfs backed, it has
 673          * been restored from swap. If the object is stolen however, it will be
 674          * full of whatever garbage was left in there.
 675          */
 676         if (state == FBINFO_STATE_RUNNING &&
 677             !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
 678                 memset_io(info->screen_base, 0, info->screen_size);
 679
 680         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 681         console_unlock();
 682
 683 set_suspend:
 684         intel_fbdev_hpd_set_suspend(dev_priv, state);
 685 }
 686
 687 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 688 {
 689         struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 690         bool send_hpd;
 691
 692         if (!ifbdev)
 693                 return;
 694
 695         intel_fbdev_sync(ifbdev);
 696
 697         mutex_lock(&ifbdev->hpd_lock);
 698         send_hpd = !ifbdev->hpd_suspended;
 699         ifbdev->hpd_waiting = true;
 700         mutex_unlock(&ifbdev->hpd_lock);
 701
 702         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 703                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 704 }
 705
 706 void intel_fbdev_restore_mode(struct drm_device *dev)
 707 {
 708         struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 709
 710         if (!ifbdev)
 711                 return;
 712
 713         intel_fbdev_sync(ifbdev);
 714         if (!ifbdev->vma)
 715                 return;
 716
 717         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 718                 intel_fbdev_invalidate(ifbdev);
 719 }
 720
 721 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
 722 {
 723         if (!fbdev || !fbdev->helper.fb)
 724                 return NULL;
 725
 726         return to_intel_framebuffer(fbdev->helper.fb);
 727 }