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->stolen_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         int ret;
 214
 215         mutex_lock(&ifbdev->hpd_lock);
 216         ret = ifbdev->hpd_suspended ? -EAGAIN : 0;
 217         mutex_unlock(&ifbdev->hpd_lock);
 218         if (ret)
 219                 return ret;
 220
 221         if (intel_fb &&
 222             (sizes->fb_width > intel_fb->base.width ||
 223              sizes->fb_height > intel_fb->base.height)) {
 224                 drm_dbg_kms(&dev_priv->drm,
 225                             "BIOS fb too small (%dx%d), we require (%dx%d),"
 226                             " releasing it\n",
 227                             intel_fb->base.width, intel_fb->base.height,
 228                             sizes->fb_width, sizes->fb_height);
 229                 drm_framebuffer_put(&intel_fb->base);
 230                 intel_fb = ifbdev->fb = NULL;
 231         }
 232         if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
 233                 drm_dbg_kms(&dev_priv->drm,
 234                             "no BIOS fb, allocating a new one\n");
 235                 ret = intelfb_alloc(helper, sizes);
 236                 if (ret)
 237                         return ret;
 238                 intel_fb = ifbdev->fb;
 239         } else {
 240                 drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
 241                 prealloc = true;
 242                 sizes->fb_width = intel_fb->base.width;
 243                 sizes->fb_height = intel_fb->base.height;
 244         }
 245
 246         wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
 247
 248         /* Pin the GGTT vma for our access via info->screen_base.
 249          * This also validates that any existing fb inherited from the
 250          * BIOS is suitable for own access.
 251          */
 252         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, false,
 253                                          &view, false, &flags);
 254         if (IS_ERR(vma)) {
 255                 ret = PTR_ERR(vma);
 256                 goto out_unlock;
 257         }
 258
 259         info = drm_fb_helper_alloc_info(helper);
 260         if (IS_ERR(info)) {
 261                 drm_err(&dev_priv->drm, "Failed to allocate fb_info (%pe)\n", info);
 262                 ret = PTR_ERR(info);
 263                 goto out_unpin;
 264         }
 265
 266         ifbdev->helper.fb = &ifbdev->fb->base;
 267
 268         info->fbops = &intelfb_ops;
 269
 270         /* setup aperture base/size for vesafb takeover */
 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                 info->apertures->ranges[0].base = mem->io_start;
 276                 info->apertures->ranges[0].size = mem->io_size;
 277
 278                 /* Use fbdev's framebuffer from lmem for discrete */
 279                 info->fix.smem_start =
 280                         (unsigned long)(mem->io_start +
 281                                         i915_gem_object_get_dma_address(obj, 0));
 282                 info->fix.smem_len = obj->base.size;
 283         } else {
 284                 info->apertures->ranges[0].base = ggtt->gmadr.start;
 285                 info->apertures->ranges[0].size = ggtt->mappable_end;
 286
 287                 /* Our framebuffer is the entirety of fbdev's system memory */
 288                 info->fix.smem_start =
 289                         (unsigned long)(ggtt->gmadr.start + vma->node.start);
 290                 info->fix.smem_len = vma->size;
 291         }
 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                 goto out_unpin;
 299         }
 300         info->screen_base = vaddr;
 301         info->screen_size = vma->size;
 302
 303         drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 304
 305         /* If the object is shmemfs backed, it will have given us zeroed pages.
 306          * If the object is stolen however, it will be full of whatever
 307          * garbage was left in there.
 308          */
 309         if (!i915_gem_object_is_shmem(vma->obj) && !prealloc)
 310                 memset_io(info->screen_base, 0, info->screen_size);
 311
 312         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 313
 314         drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
 315                     ifbdev->fb->base.width, ifbdev->fb->base.height,
 316                     i915_ggtt_offset(vma));
 317         ifbdev->vma = vma;
 318         ifbdev->vma_flags = flags;
 319
 320         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 321         vga_switcheroo_client_fb_set(pdev, info);
 322         return 0;
 323
 324 out_unpin:
 325         intel_unpin_fb_vma(vma, flags);
 326 out_unlock:
 327         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 328         return ret;
 329 }
 330
 331 static int intelfb_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip)
 332 {
 333         if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
 334                 return 0;
 335
 336         if (helper->fb->funcs->dirty)
 337                 return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
 338
 339         return 0;
 340 }
 341
 342 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 343         .fb_probe = intelfb_create,
 344         .fb_dirty = intelfb_dirty,
 345 };
 346
 347 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 348 {
 349         /* We rely on the object-free to release the VMA pinning for
 350          * the info->screen_base mmaping. Leaking the VMA is simpler than
 351          * trying to rectify all the possible error paths leading here.
 352          */
 353
 354         drm_fb_helper_fini(&ifbdev->helper);
 355
 356         if (ifbdev->vma)
 357                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 358
 359         if (ifbdev->fb)
 360                 drm_framebuffer_remove(&ifbdev->fb->base);
 361
 362         kfree(ifbdev);
 363 }
 364
 365 /*
 366  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 367  * The core display code will have read out the current plane configuration,
 368  * so we use that to figure out if there's an object for us to use as the
 369  * fb, and if so, we re-use it for the fbdev configuration.
 370  *
 371  * Note we only support a single fb shared across pipes for boot (mostly for
 372  * fbcon), so we just find the biggest and use that.
 373  */
 374 static bool intel_fbdev_init_bios(struct drm_device *dev,
 375                                   struct intel_fbdev *ifbdev)
 376 {
 377         struct drm_i915_private *i915 = to_i915(dev);
 378         struct intel_framebuffer *fb = NULL;
 379         struct intel_crtc *crtc;
 380         unsigned int max_size = 0;
 381
 382         /* Find the largest fb */
 383         for_each_intel_crtc(dev, crtc) {
 384                 struct intel_crtc_state *crtc_state =
 385                         to_intel_crtc_state(crtc->base.state);
 386                 struct intel_plane *plane =
 387                         to_intel_plane(crtc->base.primary);
 388                 struct intel_plane_state *plane_state =
 389                         to_intel_plane_state(plane->base.state);
 390                 struct drm_i915_gem_object *obj =
 391                         intel_fb_obj(plane_state->uapi.fb);
 392
 393                 if (!crtc_state->uapi.active) {
 394                         drm_dbg_kms(&i915->drm,
 395                                     "[CRTC:%d:%s] not active, skipping\n",
 396                                     crtc->base.base.id, crtc->base.name);
 397                         continue;
 398                 }
 399
 400                 if (!obj) {
 401                         drm_dbg_kms(&i915->drm,
 402                                     "[PLANE:%d:%s] no fb, skipping\n",
 403                                     plane->base.base.id, plane->base.name);
 404                         continue;
 405                 }
 406
 407                 if (obj->base.size > max_size) {
 408                         drm_dbg_kms(&i915->drm,
 409                                     "found possible fb from [PLANE:%d:%s]\n",
 410                                     plane->base.base.id, plane->base.name);
 411                         fb = to_intel_framebuffer(plane_state->uapi.fb);
 412                         max_size = obj->base.size;
 413                 }
 414         }
 415
 416         if (!fb) {
 417                 drm_dbg_kms(&i915->drm,
 418                             "no active fbs found, not using BIOS config\n");
 419                 goto out;
 420         }
 421
 422         /* Now make sure all the pipes will fit into it */
 423         for_each_intel_crtc(dev, crtc) {
 424                 struct intel_crtc_state *crtc_state =
 425                         to_intel_crtc_state(crtc->base.state);
 426                 struct intel_plane *plane =
 427                         to_intel_plane(crtc->base.primary);
 428                 unsigned int cur_size;
 429
 430                 if (!crtc_state->uapi.active) {
 431                         drm_dbg_kms(&i915->drm,
 432                                     "[CRTC:%d:%s] not active, skipping\n",
 433                                     crtc->base.base.id, crtc->base.name);
 434                         continue;
 435                 }
 436
 437                 drm_dbg_kms(&i915->drm, "checking [PLANE:%d:%s] for BIOS fb\n",
 438                             plane->base.base.id, plane->base.name);
 439
 440                 /*
 441                  * See if the plane fb we found above will fit on this
 442                  * pipe.  Note we need to use the selected fb's pitch and bpp
 443                  * rather than the current pipe's, since they differ.
 444                  */
 445                 cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay;
 446                 cur_size = cur_size * fb->base.format->cpp[0];
 447                 if (fb->base.pitches[0] < cur_size) {
 448                         drm_dbg_kms(&i915->drm,
 449                                     "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n",
 450                                     plane->base.base.id, plane->base.name,
 451                                     cur_size, fb->base.pitches[0]);
 452                         fb = NULL;
 453                         break;
 454                 }
 455
 456                 cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay;
 457                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 458                 cur_size *= fb->base.pitches[0];
 459                 drm_dbg_kms(&i915->drm,
 460                             "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n",
 461                             crtc->base.base.id, crtc->base.name,
 462                             crtc_state->uapi.adjusted_mode.crtc_hdisplay,
 463                             crtc_state->uapi.adjusted_mode.crtc_vdisplay,
 464                             fb->base.format->cpp[0] * 8,
 465                             cur_size);
 466
 467                 if (cur_size > max_size) {
 468                         drm_dbg_kms(&i915->drm,
 469                                     "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n",
 470                                     plane->base.base.id, plane->base.name,
 471                                     cur_size, max_size);
 472                         fb = NULL;
 473                         break;
 474                 }
 475
 476                 drm_dbg_kms(&i915->drm,
 477                             "fb big enough [PLANE:%d:%s] (%d >= %d)\n",
 478                             plane->base.base.id, plane->base.name,
 479                             max_size, cur_size);
 480         }
 481
 482         if (!fb) {
 483                 drm_dbg_kms(&i915->drm,
 484                             "BIOS fb not suitable for all pipes, not using\n");
 485                 goto out;
 486         }
 487
 488         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 489         ifbdev->fb = fb;
 490
 491         drm_framebuffer_get(&ifbdev->fb->base);
 492
 493         /* Final pass to check if any active pipes don't have fbs */
 494         for_each_intel_crtc(dev, crtc) {
 495                 struct intel_crtc_state *crtc_state =
 496                         to_intel_crtc_state(crtc->base.state);
 497                 struct intel_plane *plane =
 498                         to_intel_plane(crtc->base.primary);
 499                 struct intel_plane_state *plane_state =
 500                         to_intel_plane_state(plane->base.state);
 501
 502                 if (!crtc_state->uapi.active)
 503                         continue;
 504
 505                 drm_WARN(dev, !plane_state->uapi.fb,
 506                          "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n",
 507                          plane->base.base.id, plane->base.name);
 508         }
 509
 510
 511         drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n");
 512         return true;
 513
 514 out:
 515
 516         return false;
 517 }
 518
 519 static void intel_fbdev_suspend_worker(struct work_struct *work)
 520 {
 521         intel_fbdev_set_suspend(&container_of(work,
 522                                               struct drm_i915_private,
 523                                               display.fbdev.suspend_work)->drm,
 524                                 FBINFO_STATE_RUNNING,
 525                                 true);
 526 }
 527
 528 int intel_fbdev_init(struct drm_device *dev)
 529 {
 530         struct drm_i915_private *dev_priv = to_i915(dev);
 531         struct intel_fbdev *ifbdev;
 532         int ret;
 533
 534         if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
 535                 return -ENODEV;
 536
 537         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 538         if (ifbdev == NULL)
 539                 return -ENOMEM;
 540
 541         mutex_init(&ifbdev->hpd_lock);
 542         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 543
 544         if (!intel_fbdev_init_bios(dev, ifbdev))
 545                 ifbdev->preferred_bpp = 32;
 546
 547         ret = drm_fb_helper_init(dev, &ifbdev->helper);
 548         if (ret) {
 549                 kfree(ifbdev);
 550                 return ret;
 551         }
 552
 553         dev_priv->display.fbdev.fbdev = ifbdev;
 554         INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
 555
 556         return 0;
 557 }
 558
 559 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 560 {
 561         struct intel_fbdev *ifbdev = data;
 562
 563         /* Due to peculiar init order wrt to hpd handling this is separate. */
 564         if (drm_fb_helper_initial_config(&ifbdev->helper,
 565                                          ifbdev->preferred_bpp))
 566                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 567 }
 568
 569 void intel_fbdev_initial_config_async(struct drm_device *dev)
 570 {
 571         struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 572
 573         if (!ifbdev)
 574                 return;
 575
 576         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 577 }
 578
 579 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 580 {
 581         if (!ifbdev->cookie)
 582                 return;
 583
 584         /* Only serialises with all preceding async calls, hence +1 */
 585         async_synchronize_cookie(ifbdev->cookie + 1);
 586         ifbdev->cookie = 0;
 587 }
 588
 589 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 590 {
 591         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 592
 593         if (!ifbdev)
 594                 return;
 595
 596         intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true);
 597
 598         if (!current_is_async())
 599                 intel_fbdev_sync(ifbdev);
 600
 601         drm_fb_helper_unregister_info(&ifbdev->helper);
 602 }
 603
 604 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 605 {
 606         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev);
 607
 608         if (!ifbdev)
 609                 return;
 610
 611         intel_fbdev_destroy(ifbdev);
 612 }
 613
 614 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 615  * processing, fbdev will perform a full connector reprobe if a hotplug event
 616  * was received while HPD was suspended.
 617  */
 618 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
 619 {
 620         struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev;
 621         bool send_hpd = false;
 622
 623         mutex_lock(&ifbdev->hpd_lock);
 624         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 625         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 626         ifbdev->hpd_waiting = false;
 627         mutex_unlock(&ifbdev->hpd_lock);
 628
 629         if (send_hpd) {
 630                 drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
 631                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 632         }
 633 }
 634
 635 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 636 {
 637         struct drm_i915_private *dev_priv = to_i915(dev);
 638         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 639         struct fb_info *info;
 640
 641         if (!ifbdev || !ifbdev->vma)
 642                 goto set_suspend;
 643
 644         info = ifbdev->helper.info;
 645
 646         if (synchronous) {
 647                 /* Flush any pending work to turn the console on, and then
 648                  * wait to turn it off. It must be synchronous as we are
 649                  * about to suspend or unload the driver.
 650                  *
 651                  * Note that from within the work-handler, we cannot flush
 652                  * ourselves, so only flush outstanding work upon suspend!
 653                  */
 654                 if (state != FBINFO_STATE_RUNNING)
 655                         flush_work(&dev_priv->display.fbdev.suspend_work);
 656
 657                 console_lock();
 658         } else {
 659                 /*
 660                  * The console lock can be pretty contented on resume due
 661                  * to all the printk activity.  Try to keep it out of the hot
 662                  * path of resume if possible.
 663                  */
 664                 drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
 665                 if (!console_trylock()) {
 666                         /* Don't block our own workqueue as this can
 667                          * be run in parallel with other i915.ko tasks.
 668                          */
 669                         schedule_work(&dev_priv->display.fbdev.suspend_work);
 670                         return;
 671                 }
 672         }
 673
 674         /* On resume from hibernation: If the object is shmemfs backed, it has
 675          * been restored from swap. If the object is stolen however, it will be
 676          * full of whatever garbage was left in there.
 677          */
 678         if (state == FBINFO_STATE_RUNNING &&
 679             !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
 680                 memset_io(info->screen_base, 0, info->screen_size);
 681
 682         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 683         console_unlock();
 684
 685 set_suspend:
 686         intel_fbdev_hpd_set_suspend(dev_priv, state);
 687 }
 688
 689 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 690 {
 691         struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 692         bool send_hpd;
 693
 694         if (!ifbdev)
 695                 return;
 696
 697         intel_fbdev_sync(ifbdev);
 698
 699         mutex_lock(&ifbdev->hpd_lock);
 700         send_hpd = !ifbdev->hpd_suspended;
 701         ifbdev->hpd_waiting = true;
 702         mutex_unlock(&ifbdev->hpd_lock);
 703
 704         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 705                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 706 }
 707
 708 void intel_fbdev_restore_mode(struct drm_device *dev)
 709 {
 710         struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 711
 712         if (!ifbdev)
 713                 return;
 714
 715         intel_fbdev_sync(ifbdev);
 716         if (!ifbdev->vma)
 717                 return;
 718
 719         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 720                 intel_fbdev_invalidate(ifbdev);
 721 }
 722
 723 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
 724 {
 725         if (!fbdev || !fbdev->helper.fb)
 726                 return NULL;
 727
 728         return to_intel_framebuffer(fbdev->helper.fb);
 729 }