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/fb.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/mm.h>
  35 #include <linux/module.h>
  36 #include <linux/string.h>
  37 #include <linux/sysrq.h>
  38 #include <linux/tty.h>
  39 #include <linux/vga_switcheroo.h>
  40
  41 #include <drm/drm_crtc.h>
  42 #include <drm/drm_fb_helper.h>
  43 #include <drm/drm_fourcc.h>
  44 #include <drm/drm_gem_framebuffer_helper.h>
  45
  46 #include "gem/i915_gem_lmem.h"
  47 #include "gem/i915_gem_mman.h"
  48
  49 #include "i915_drv.h"
  50 #include "intel_display_types.h"
  51 #include "intel_fb.h"
  52 #include "intel_fb_pin.h"
  53 #include "intel_fbdev.h"
  54 #include "intel_frontbuffer.h"
  55
  56 struct intel_fbdev {
  57         struct drm_fb_helper helper;
  58         struct intel_framebuffer *fb;
  59         struct i915_vma *vma;
  60         unsigned long vma_flags;
  61         async_cookie_t cookie;
  62         int preferred_bpp;
  63
  64         /* Whether or not fbdev hpd processing is temporarily suspended */
  65         bool hpd_suspended: 1;
  66         /* Set when a hotplug was received while HPD processing was suspended */
  67         bool hpd_waiting: 1;
  68
  69         /* Protects hpd_suspended */
  70         struct mutex hpd_lock;
  71 };
  72
  73 static struct intel_fbdev *to_intel_fbdev(struct drm_fb_helper *fb_helper)
  74 {
  75         return container_of(fb_helper, struct intel_fbdev, helper);
  76 }
  77
  78 static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
  79 {
  80         return ifbdev->fb->frontbuffer;
  81 }
  82
  83 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  84 {
  85         intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
  86 }
  87
  88 FB_GEN_DEFAULT_DEFERRED_IO_OPS(intel_fbdev,
  89                                drm_fb_helper_damage_range,
  90                                drm_fb_helper_damage_area)
  91
  92 static int intel_fbdev_set_par(struct fb_info *info)
  93 {
  94         struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
  95         int ret;
  96
  97         ret = drm_fb_helper_set_par(info);
  98         if (ret == 0)
  99                 intel_fbdev_invalidate(ifbdev);
 100
 101         return ret;
 102 }
 103
 104 static int intel_fbdev_blank(int blank, struct fb_info *info)
 105 {
 106         struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
 107         int ret;
 108
 109         ret = drm_fb_helper_blank(blank, info);
 110         if (ret == 0)
 111                 intel_fbdev_invalidate(ifbdev);
 112
 113         return ret;
 114 }
 115
 116 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
 117                                    struct fb_info *info)
 118 {
 119         struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
 120         int ret;
 121
 122         ret = drm_fb_helper_pan_display(var, info);
 123         if (ret == 0)
 124                 intel_fbdev_invalidate(ifbdev);
 125
 126         return ret;
 127 }
 128
 129 static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
 130 {
 131         struct intel_fbdev *fbdev = to_intel_fbdev(info->par);
 132         struct drm_gem_object *bo = drm_gem_fb_get_obj(&fbdev->fb->base, 0);
 133         struct drm_i915_gem_object *obj = to_intel_bo(bo);
 134
 135         return i915_gem_fb_mmap(obj, vma);
 136 }
 137
 138 __diag_push();
 139 __diag_ignore_all("-Woverride-init", "Allow overriding the default ops");
 140
 141 static const struct fb_ops intelfb_ops = {
 142         .owner = THIS_MODULE,
 143         __FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev),
 144         DRM_FB_HELPER_DEFAULT_OPS,
 145         .fb_set_par = intel_fbdev_set_par,
 146         .fb_blank = intel_fbdev_blank,
 147         .fb_pan_display = intel_fbdev_pan_display,
 148         __FB_DEFAULT_DEFERRED_OPS_DRAW(intel_fbdev),
 149         .fb_mmap = intel_fbdev_mmap,
 150 };
 151
 152 __diag_pop();
 153
 154 static int intelfb_alloc(struct drm_fb_helper *helper,
 155                          struct drm_fb_helper_surface_size *sizes)
 156 {
 157         struct intel_fbdev *ifbdev = to_intel_fbdev(helper);
 158         struct drm_framebuffer *fb;
 159         struct drm_device *dev = helper->dev;
 160         struct drm_i915_private *dev_priv = to_i915(dev);
 161         struct drm_mode_fb_cmd2 mode_cmd = {};
 162         struct drm_i915_gem_object *obj;
 163         int size;
 164
 165         /* we don't do packed 24bpp */
 166         if (sizes->surface_bpp == 24)
 167                 sizes->surface_bpp = 32;
 168
 169         mode_cmd.width = sizes->surface_width;
 170         mode_cmd.height = sizes->surface_height;
 171
 172         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 173                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 174         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 175                                                           sizes->surface_depth);
 176
 177         size = mode_cmd.pitches[0] * mode_cmd.height;
 178         size = PAGE_ALIGN(size);
 179
 180         obj = ERR_PTR(-ENODEV);
 181         if (HAS_LMEM(dev_priv)) {
 182                 obj = i915_gem_object_create_lmem(dev_priv, size,
 183                                                   I915_BO_ALLOC_CONTIGUOUS |
 184                                                   I915_BO_ALLOC_USER);
 185         } else {
 186                 /*
 187                  * If the FB is too big, just don't use it since fbdev is not very
 188                  * important and we should probably use that space with FBC or other
 189                  * features.
 190                  */
 191                 if (size * 2 < dev_priv->dsm.usable_size)
 192                         obj = i915_gem_object_create_stolen(dev_priv, size);
 193                 if (IS_ERR(obj))
 194                         obj = i915_gem_object_create_shmem(dev_priv, size);
 195         }
 196
 197         if (IS_ERR(obj)) {
 198                 drm_err(&dev_priv->drm, "failed to allocate framebuffer (%pe)\n", obj);
 199                 return PTR_ERR(obj);
 200         }
 201
 202         fb = intel_framebuffer_create(obj, &mode_cmd);
 203         i915_gem_object_put(obj);
 204         if (IS_ERR(fb))
 205                 return PTR_ERR(fb);
 206
 207         ifbdev->fb = to_intel_framebuffer(fb);
 208         return 0;
 209 }
 210
 211 static int intelfb_create(struct drm_fb_helper *helper,
 212                           struct drm_fb_helper_surface_size *sizes)
 213 {
 214         struct intel_fbdev *ifbdev = to_intel_fbdev(helper);
 215         struct intel_framebuffer *intel_fb = ifbdev->fb;
 216         struct drm_device *dev = helper->dev;
 217         struct drm_i915_private *dev_priv = to_i915(dev);
 218         struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 219         struct i915_ggtt *ggtt = to_gt(dev_priv)->ggtt;
 220         const struct i915_gtt_view view = {
 221                 .type = I915_GTT_VIEW_NORMAL,
 222         };
 223         intel_wakeref_t wakeref;
 224         struct fb_info *info;
 225         struct i915_vma *vma;
 226         unsigned long flags = 0;
 227         bool prealloc = false;
 228         void __iomem *vaddr;
 229         struct drm_i915_gem_object *obj;
 230         struct i915_gem_ww_ctx ww;
 231         int ret;
 232
 233         mutex_lock(&ifbdev->hpd_lock);
 234         ret = ifbdev->hpd_suspended ? -EAGAIN : 0;
 235         mutex_unlock(&ifbdev->hpd_lock);
 236         if (ret)
 237                 return ret;
 238
 239         if (intel_fb &&
 240             (sizes->fb_width > intel_fb->base.width ||
 241              sizes->fb_height > intel_fb->base.height)) {
 242                 drm_dbg_kms(&dev_priv->drm,
 243                             "BIOS fb too small (%dx%d), we require (%dx%d),"
 244                             " releasing it\n",
 245                             intel_fb->base.width, intel_fb->base.height,
 246                             sizes->fb_width, sizes->fb_height);
 247                 drm_framebuffer_put(&intel_fb->base);
 248                 intel_fb = ifbdev->fb = NULL;
 249         }
 250         if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
 251                 drm_dbg_kms(&dev_priv->drm,
 252                             "no BIOS fb, allocating a new one\n");
 253                 ret = intelfb_alloc(helper, sizes);
 254                 if (ret)
 255                         return ret;
 256                 intel_fb = ifbdev->fb;
 257         } else {
 258                 drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
 259                 prealloc = true;
 260                 sizes->fb_width = intel_fb->base.width;
 261                 sizes->fb_height = intel_fb->base.height;
 262         }
 263
 264         wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
 265
 266         /* Pin the GGTT vma for our access via info->screen_base.
 267          * This also validates that any existing fb inherited from the
 268          * BIOS is suitable for own access.
 269          */
 270         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, false,
 271                                          &view, false, &flags);
 272         if (IS_ERR(vma)) {
 273                 ret = PTR_ERR(vma);
 274                 goto out_unlock;
 275         }
 276
 277         info = drm_fb_helper_alloc_info(helper);
 278         if (IS_ERR(info)) {
 279                 drm_err(&dev_priv->drm, "Failed to allocate fb_info (%pe)\n", info);
 280                 ret = PTR_ERR(info);
 281                 goto out_unpin;
 282         }
 283
 284         ifbdev->helper.fb = &ifbdev->fb->base;
 285
 286         info->fbops = &intelfb_ops;
 287
 288         obj = intel_fb_obj(&intel_fb->base);
 289         if (i915_gem_object_is_lmem(obj)) {
 290                 struct intel_memory_region *mem = obj->mm.region;
 291
 292                 /* Use fbdev's framebuffer from lmem for discrete */
 293                 info->fix.smem_start =
 294                         (unsigned long)(mem->io_start +
 295                                         i915_gem_object_get_dma_address(obj, 0));
 296                 info->fix.smem_len = obj->base.size;
 297         } else {
 298                 /* Our framebuffer is the entirety of fbdev's system memory */
 299                 info->fix.smem_start =
 300                         (unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma));
 301                 info->fix.smem_len = vma->size;
 302         }
 303
 304         for_i915_gem_ww(&ww, ret, false) {
 305                 ret = i915_gem_object_lock(vma->obj, &ww);
 306
 307                 if (ret)
 308                         continue;
 309
 310                 vaddr = i915_vma_pin_iomap(vma);
 311                 if (IS_ERR(vaddr)) {
 312                         drm_err(&dev_priv->drm,
 313                                 "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr);
 314                         ret = PTR_ERR(vaddr);
 315                         continue;
 316                 }
 317         }
 318
 319         if (ret)
 320                 goto out_unpin;
 321
 322         info->screen_base = vaddr;
 323         info->screen_size = vma->size;
 324
 325         drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 326
 327         /* If the object is shmemfs backed, it will have given us zeroed pages.
 328          * If the object is stolen however, it will be full of whatever
 329          * garbage was left in there.
 330          */
 331         if (!i915_gem_object_is_shmem(vma->obj) && !prealloc)
 332                 memset_io(info->screen_base, 0, info->screen_size);
 333
 334         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 335
 336         drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
 337                     ifbdev->fb->base.width, ifbdev->fb->base.height,
 338                     i915_ggtt_offset(vma));
 339         ifbdev->vma = vma;
 340         ifbdev->vma_flags = flags;
 341
 342         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 343         vga_switcheroo_client_fb_set(pdev, info);
 344         return 0;
 345
 346 out_unpin:
 347         intel_unpin_fb_vma(vma, flags);
 348 out_unlock:
 349         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 350         return ret;
 351 }
 352
 353 static int intelfb_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip)
 354 {
 355         if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
 356                 return 0;
 357
 358         if (helper->fb->funcs->dirty)
 359                 return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
 360
 361         return 0;
 362 }
 363
 364 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 365         .fb_probe = intelfb_create,
 366         .fb_dirty = intelfb_dirty,
 367 };
 368
 369 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 370 {
 371         /* We rely on the object-free to release the VMA pinning for
 372          * the info->screen_base mmaping. Leaking the VMA is simpler than
 373          * trying to rectify all the possible error paths leading here.
 374          */
 375
 376         drm_fb_helper_fini(&ifbdev->helper);
 377
 378         if (ifbdev->vma)
 379                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 380
 381         if (ifbdev->fb)
 382                 drm_framebuffer_remove(&ifbdev->fb->base);
 383
 384         drm_fb_helper_unprepare(&ifbdev->helper);
 385         kfree(ifbdev);
 386 }
 387
 388 /*
 389  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 390  * The core display code will have read out the current plane configuration,
 391  * so we use that to figure out if there's an object for us to use as the
 392  * fb, and if so, we re-use it for the fbdev configuration.
 393  *
 394  * Note we only support a single fb shared across pipes for boot (mostly for
 395  * fbcon), so we just find the biggest and use that.
 396  */
 397 static bool intel_fbdev_init_bios(struct drm_device *dev,
 398                                   struct intel_fbdev *ifbdev)
 399 {
 400         struct drm_i915_private *i915 = to_i915(dev);
 401         struct intel_framebuffer *fb = NULL;
 402         struct intel_crtc *crtc;
 403         unsigned int max_size = 0;
 404
 405         /* Find the largest fb */
 406         for_each_intel_crtc(dev, crtc) {
 407                 struct intel_crtc_state *crtc_state =
 408                         to_intel_crtc_state(crtc->base.state);
 409                 struct intel_plane *plane =
 410                         to_intel_plane(crtc->base.primary);
 411                 struct intel_plane_state *plane_state =
 412                         to_intel_plane_state(plane->base.state);
 413                 struct drm_i915_gem_object *obj =
 414                         intel_fb_obj(plane_state->uapi.fb);
 415
 416                 if (!crtc_state->uapi.active) {
 417                         drm_dbg_kms(&i915->drm,
 418                                     "[CRTC:%d:%s] not active, skipping\n",
 419                                     crtc->base.base.id, crtc->base.name);
 420                         continue;
 421                 }
 422
 423                 if (!obj) {
 424                         drm_dbg_kms(&i915->drm,
 425                                     "[PLANE:%d:%s] no fb, skipping\n",
 426                                     plane->base.base.id, plane->base.name);
 427                         continue;
 428                 }
 429
 430                 if (obj->base.size > max_size) {
 431                         drm_dbg_kms(&i915->drm,
 432                                     "found possible fb from [PLANE:%d:%s]\n",
 433                                     plane->base.base.id, plane->base.name);
 434                         fb = to_intel_framebuffer(plane_state->uapi.fb);
 435                         max_size = obj->base.size;
 436                 }
 437         }
 438
 439         if (!fb) {
 440                 drm_dbg_kms(&i915->drm,
 441                             "no active fbs found, not using BIOS config\n");
 442                 goto out;
 443         }
 444
 445         /* Now make sure all the pipes will fit into it */
 446         for_each_intel_crtc(dev, crtc) {
 447                 struct intel_crtc_state *crtc_state =
 448                         to_intel_crtc_state(crtc->base.state);
 449                 struct intel_plane *plane =
 450                         to_intel_plane(crtc->base.primary);
 451                 unsigned int cur_size;
 452
 453                 if (!crtc_state->uapi.active) {
 454                         drm_dbg_kms(&i915->drm,
 455                                     "[CRTC:%d:%s] not active, skipping\n",
 456                                     crtc->base.base.id, crtc->base.name);
 457                         continue;
 458                 }
 459
 460                 drm_dbg_kms(&i915->drm, "checking [PLANE:%d:%s] for BIOS fb\n",
 461                             plane->base.base.id, plane->base.name);
 462
 463                 /*
 464                  * See if the plane fb we found above will fit on this
 465                  * pipe.  Note we need to use the selected fb's pitch and bpp
 466                  * rather than the current pipe's, since they differ.
 467                  */
 468                 cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay;
 469                 cur_size = cur_size * fb->base.format->cpp[0];
 470                 if (fb->base.pitches[0] < cur_size) {
 471                         drm_dbg_kms(&i915->drm,
 472                                     "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n",
 473                                     plane->base.base.id, plane->base.name,
 474                                     cur_size, fb->base.pitches[0]);
 475                         fb = NULL;
 476                         break;
 477                 }
 478
 479                 cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay;
 480                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 481                 cur_size *= fb->base.pitches[0];
 482                 drm_dbg_kms(&i915->drm,
 483                             "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n",
 484                             crtc->base.base.id, crtc->base.name,
 485                             crtc_state->uapi.adjusted_mode.crtc_hdisplay,
 486                             crtc_state->uapi.adjusted_mode.crtc_vdisplay,
 487                             fb->base.format->cpp[0] * 8,
 488                             cur_size);
 489
 490                 if (cur_size > max_size) {
 491                         drm_dbg_kms(&i915->drm,
 492                                     "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n",
 493                                     plane->base.base.id, plane->base.name,
 494                                     cur_size, max_size);
 495                         fb = NULL;
 496                         break;
 497                 }
 498
 499                 drm_dbg_kms(&i915->drm,
 500                             "fb big enough [PLANE:%d:%s] (%d >= %d)\n",
 501                             plane->base.base.id, plane->base.name,
 502                             max_size, cur_size);
 503         }
 504
 505         if (!fb) {
 506                 drm_dbg_kms(&i915->drm,
 507                             "BIOS fb not suitable for all pipes, not using\n");
 508                 goto out;
 509         }
 510
 511         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 512         ifbdev->fb = fb;
 513
 514         drm_framebuffer_get(&ifbdev->fb->base);
 515
 516         /* Final pass to check if any active pipes don't have fbs */
 517         for_each_intel_crtc(dev, crtc) {
 518                 struct intel_crtc_state *crtc_state =
 519                         to_intel_crtc_state(crtc->base.state);
 520                 struct intel_plane *plane =
 521                         to_intel_plane(crtc->base.primary);
 522                 struct intel_plane_state *plane_state =
 523                         to_intel_plane_state(plane->base.state);
 524
 525                 if (!crtc_state->uapi.active)
 526                         continue;
 527
 528                 drm_WARN(dev, !plane_state->uapi.fb,
 529                          "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n",
 530                          plane->base.base.id, plane->base.name);
 531         }
 532
 533
 534         drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n");
 535         return true;
 536
 537 out:
 538
 539         return false;
 540 }
 541
 542 static void intel_fbdev_suspend_worker(struct work_struct *work)
 543 {
 544         intel_fbdev_set_suspend(&container_of(work,
 545                                               struct drm_i915_private,
 546                                               display.fbdev.suspend_work)->drm,
 547                                 FBINFO_STATE_RUNNING,
 548                                 true);
 549 }
 550
 551 int intel_fbdev_init(struct drm_device *dev)
 552 {
 553         struct drm_i915_private *dev_priv = to_i915(dev);
 554         struct intel_fbdev *ifbdev;
 555         int ret;
 556
 557         if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
 558                 return -ENODEV;
 559
 560         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 561         if (ifbdev == NULL)
 562                 return -ENOMEM;
 563
 564         mutex_init(&ifbdev->hpd_lock);
 565         drm_fb_helper_prepare(dev, &ifbdev->helper, 32, &intel_fb_helper_funcs);
 566
 567         if (intel_fbdev_init_bios(dev, ifbdev))
 568                 ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
 569         else
 570                 ifbdev->preferred_bpp = ifbdev->helper.preferred_bpp;
 571
 572         ret = drm_fb_helper_init(dev, &ifbdev->helper);
 573         if (ret) {
 574                 kfree(ifbdev);
 575                 return ret;
 576         }
 577
 578         dev_priv->display.fbdev.fbdev = ifbdev;
 579         INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
 580
 581         return 0;
 582 }
 583
 584 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 585 {
 586         struct intel_fbdev *ifbdev = data;
 587
 588         /* Due to peculiar init order wrt to hpd handling this is separate. */
 589         if (drm_fb_helper_initial_config(&ifbdev->helper))
 590                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 591 }
 592
 593 void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv)
 594 {
 595         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 596
 597         if (!ifbdev)
 598                 return;
 599
 600         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 601 }
 602
 603 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 604 {
 605         if (!ifbdev->cookie)
 606                 return;
 607
 608         /* Only serialises with all preceding async calls, hence +1 */
 609         async_synchronize_cookie(ifbdev->cookie + 1);
 610         ifbdev->cookie = 0;
 611 }
 612
 613 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 614 {
 615         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 616
 617         if (!ifbdev)
 618                 return;
 619
 620         intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true);
 621
 622         if (!current_is_async())
 623                 intel_fbdev_sync(ifbdev);
 624
 625         drm_fb_helper_unregister_info(&ifbdev->helper);
 626 }
 627
 628 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 629 {
 630         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev);
 631
 632         if (!ifbdev)
 633                 return;
 634
 635         intel_fbdev_destroy(ifbdev);
 636 }
 637
 638 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 639  * processing, fbdev will perform a full connector reprobe if a hotplug event
 640  * was received while HPD was suspended.
 641  */
 642 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
 643 {
 644         struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev;
 645         bool send_hpd = false;
 646
 647         mutex_lock(&ifbdev->hpd_lock);
 648         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 649         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 650         ifbdev->hpd_waiting = false;
 651         mutex_unlock(&ifbdev->hpd_lock);
 652
 653         if (send_hpd) {
 654                 drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
 655                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 656         }
 657 }
 658
 659 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 660 {
 661         struct drm_i915_private *dev_priv = to_i915(dev);
 662         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 663         struct fb_info *info;
 664
 665         if (!ifbdev)
 666                 return;
 667
 668         if (drm_WARN_ON(&dev_priv->drm, !HAS_DISPLAY(dev_priv)))
 669                 return;
 670
 671         if (!ifbdev->vma)
 672                 goto set_suspend;
 673
 674         info = ifbdev->helper.info;
 675
 676         if (synchronous) {
 677                 /* Flush any pending work to turn the console on, and then
 678                  * wait to turn it off. It must be synchronous as we are
 679                  * about to suspend or unload the driver.
 680                  *
 681                  * Note that from within the work-handler, we cannot flush
 682                  * ourselves, so only flush outstanding work upon suspend!
 683                  */
 684                 if (state != FBINFO_STATE_RUNNING)
 685                         flush_work(&dev_priv->display.fbdev.suspend_work);
 686
 687                 console_lock();
 688         } else {
 689                 /*
 690                  * The console lock can be pretty contented on resume due
 691                  * to all the printk activity.  Try to keep it out of the hot
 692                  * path of resume if possible.
 693                  */
 694                 drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
 695                 if (!console_trylock()) {
 696                         /* Don't block our own workqueue as this can
 697                          * be run in parallel with other i915.ko tasks.
 698                          */
 699                         schedule_work(&dev_priv->display.fbdev.suspend_work);
 700                         return;
 701                 }
 702         }
 703
 704         /* On resume from hibernation: If the object is shmemfs backed, it has
 705          * been restored from swap. If the object is stolen however, it will be
 706          * full of whatever garbage was left in there.
 707          */
 708         if (state == FBINFO_STATE_RUNNING &&
 709             !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
 710                 memset_io(info->screen_base, 0, info->screen_size);
 711
 712         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 713         console_unlock();
 714
 715 set_suspend:
 716         intel_fbdev_hpd_set_suspend(dev_priv, state);
 717 }
 718
 719 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 720 {
 721         struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 722         bool send_hpd;
 723
 724         if (!ifbdev)
 725                 return;
 726
 727         intel_fbdev_sync(ifbdev);
 728
 729         mutex_lock(&ifbdev->hpd_lock);
 730         send_hpd = !ifbdev->hpd_suspended;
 731         ifbdev->hpd_waiting = true;
 732         mutex_unlock(&ifbdev->hpd_lock);
 733
 734         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 735                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 736 }
 737
 738 void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
 739 {
 740         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 741
 742         if (!ifbdev)
 743                 return;
 744
 745         intel_fbdev_sync(ifbdev);
 746         if (!ifbdev->vma)
 747                 return;
 748
 749         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 750                 intel_fbdev_invalidate(ifbdev);
 751 }
 752
 753 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
 754 {
 755         if (!fbdev || !fbdev->helper.fb)
 756                 return NULL;
 757
 758         return to_intel_framebuffer(fbdev->helper.fb);
 759 }