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