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