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_IOMEM_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 static const struct fb_ops intelfb_ops = {
 139         .owner = THIS_MODULE,
 140         __FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev),
 141         DRM_FB_HELPER_DEFAULT_OPS,
 142         .fb_set_par = intel_fbdev_set_par,
 143         .fb_blank = intel_fbdev_blank,
 144         .fb_pan_display = intel_fbdev_pan_display,
 145         __FB_DEFAULT_DEFERRED_OPS_DRAW(intel_fbdev),
 146         .fb_mmap = intel_fbdev_mmap,
 147 };
 148
 149 static int intelfb_alloc(struct drm_fb_helper *helper,
 150                          struct drm_fb_helper_surface_size *sizes)
 151 {
 152         struct intel_fbdev *ifbdev = to_intel_fbdev(helper);
 153         struct drm_framebuffer *fb;
 154         struct drm_device *dev = helper->dev;
 155         struct drm_i915_private *dev_priv = to_i915(dev);
 156         struct drm_mode_fb_cmd2 mode_cmd = {};
 157         struct drm_i915_gem_object *obj;
 158         int size;
 159
 160         /* we don't do packed 24bpp */
 161         if (sizes->surface_bpp == 24)
 162                 sizes->surface_bpp = 32;
 163
 164         mode_cmd.width = sizes->surface_width;
 165         mode_cmd.height = sizes->surface_height;
 166
 167         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 168                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 169         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 170                                                           sizes->surface_depth);
 171
 172         size = mode_cmd.pitches[0] * mode_cmd.height;
 173         size = PAGE_ALIGN(size);
 174
 175         obj = ERR_PTR(-ENODEV);
 176         if (HAS_LMEM(dev_priv)) {
 177                 obj = i915_gem_object_create_lmem(dev_priv, size,
 178                                                   I915_BO_ALLOC_CONTIGUOUS |
 179                                                   I915_BO_ALLOC_USER);
 180         } else {
 181                 /*
 182                  * If the FB is too big, just don't use it since fbdev is not very
 183                  * important and we should probably use that space with FBC or other
 184                  * features.
 185                  *
 186                  * Also skip stolen on MTL as Wa_22018444074 mitigation.
 187                  */
 188                 if (!(IS_METEORLAKE(dev_priv)) && size * 2 < dev_priv->dsm.usable_size)
 189                         obj = i915_gem_object_create_stolen(dev_priv, size);
 190                 if (IS_ERR(obj))
 191                         obj = i915_gem_object_create_shmem(dev_priv, size);
 192         }
 193
 194         if (IS_ERR(obj)) {
 195                 drm_err(&dev_priv->drm, "failed to allocate framebuffer (%pe)\n", obj);
 196                 return PTR_ERR(obj);
 197         }
 198
 199         fb = intel_framebuffer_create(obj, &mode_cmd);
 200         i915_gem_object_put(obj);
 201         if (IS_ERR(fb))
 202                 return PTR_ERR(fb);
 203
 204         ifbdev->fb = to_intel_framebuffer(fb);
 205         return 0;
 206 }
 207
 208 static int intelfb_create(struct drm_fb_helper *helper,
 209                           struct drm_fb_helper_surface_size *sizes)
 210 {
 211         struct intel_fbdev *ifbdev = to_intel_fbdev(helper);
 212         struct intel_framebuffer *intel_fb = ifbdev->fb;
 213         struct drm_device *dev = helper->dev;
 214         struct drm_i915_private *dev_priv = to_i915(dev);
 215         struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 216         struct i915_ggtt *ggtt = to_gt(dev_priv)->ggtt;
 217         const struct i915_gtt_view view = {
 218                 .type = I915_GTT_VIEW_NORMAL,
 219         };
 220         intel_wakeref_t wakeref;
 221         struct fb_info *info;
 222         struct i915_vma *vma;
 223         unsigned long flags = 0;
 224         bool prealloc = false;
 225         void __iomem *vaddr;
 226         struct drm_i915_gem_object *obj;
 227         struct i915_gem_ww_ctx ww;
 228         int ret;
 229
 230         mutex_lock(&ifbdev->hpd_lock);
 231         ret = ifbdev->hpd_suspended ? -EAGAIN : 0;
 232         mutex_unlock(&ifbdev->hpd_lock);
 233         if (ret)
 234                 return ret;
 235
 236         if (intel_fb &&
 237             (sizes->fb_width > intel_fb->base.width ||
 238              sizes->fb_height > intel_fb->base.height)) {
 239                 drm_dbg_kms(&dev_priv->drm,
 240                             "BIOS fb too small (%dx%d), we require (%dx%d),"
 241                             " releasing it\n",
 242                             intel_fb->base.width, intel_fb->base.height,
 243                             sizes->fb_width, sizes->fb_height);
 244                 drm_framebuffer_put(&intel_fb->base);
 245                 intel_fb = ifbdev->fb = NULL;
 246         }
 247         if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
 248                 drm_dbg_kms(&dev_priv->drm,
 249                             "no BIOS fb, allocating a new one\n");
 250                 ret = intelfb_alloc(helper, sizes);
 251                 if (ret)
 252                         return ret;
 253                 intel_fb = ifbdev->fb;
 254         } else {
 255                 drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
 256                 prealloc = true;
 257                 sizes->fb_width = intel_fb->base.width;
 258                 sizes->fb_height = intel_fb->base.height;
 259         }
 260
 261         wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
 262
 263         /* Pin the GGTT vma for our access via info->screen_base.
 264          * This also validates that any existing fb inherited from the
 265          * BIOS is suitable for own access.
 266          */
 267         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, false,
 268                                          &view, false, &flags);
 269         if (IS_ERR(vma)) {
 270                 ret = PTR_ERR(vma);
 271                 goto out_unlock;
 272         }
 273
 274         info = drm_fb_helper_alloc_info(helper);
 275         if (IS_ERR(info)) {
 276                 drm_err(&dev_priv->drm, "Failed to allocate fb_info (%pe)\n", info);
 277                 ret = PTR_ERR(info);
 278                 goto out_unpin;
 279         }
 280
 281         ifbdev->helper.fb = &ifbdev->fb->base;
 282
 283         info->fbops = &intelfb_ops;
 284
 285         obj = intel_fb_obj(&intel_fb->base);
 286         if (i915_gem_object_is_lmem(obj)) {
 287                 struct intel_memory_region *mem = obj->mm.region;
 288
 289                 /* Use fbdev's framebuffer from lmem for discrete */
 290                 info->fix.smem_start =
 291                         (unsigned long)(mem->io_start +
 292                                         i915_gem_object_get_dma_address(obj, 0));
 293                 info->fix.smem_len = obj->base.size;
 294         } else {
 295                 /* Our framebuffer is the entirety of fbdev's system memory */
 296                 info->fix.smem_start =
 297                         (unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma));
 298                 info->fix.smem_len = vma->size;
 299         }
 300
 301         for_i915_gem_ww(&ww, ret, false) {
 302                 ret = i915_gem_object_lock(vma->obj, &ww);
 303
 304                 if (ret)
 305                         continue;
 306
 307                 vaddr = i915_vma_pin_iomap(vma);
 308                 if (IS_ERR(vaddr)) {
 309                         drm_err(&dev_priv->drm,
 310                                 "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr);
 311                         ret = PTR_ERR(vaddr);
 312                         continue;
 313                 }
 314         }
 315
 316         if (ret)
 317                 goto out_unpin;
 318
 319         info->screen_base = vaddr;
 320         info->screen_size = vma->size;
 321
 322         drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
 323
 324         /* If the object is shmemfs backed, it will have given us zeroed pages.
 325          * If the object is stolen however, it will be full of whatever
 326          * garbage was left in there.
 327          */
 328         if (!i915_gem_object_is_shmem(vma->obj) && !prealloc)
 329                 memset_io(info->screen_base, 0, info->screen_size);
 330
 331         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 332
 333         drm_dbg_kms(&dev_priv->drm, "allocated %dx%d fb: 0x%08x\n",
 334                     ifbdev->fb->base.width, ifbdev->fb->base.height,
 335                     i915_ggtt_offset(vma));
 336         ifbdev->vma = vma;
 337         ifbdev->vma_flags = flags;
 338
 339         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 340         vga_switcheroo_client_fb_set(pdev, info);
 341         return 0;
 342
 343 out_unpin:
 344         intel_unpin_fb_vma(vma, flags);
 345 out_unlock:
 346         intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
 347         return ret;
 348 }
 349
 350 static int intelfb_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip)
 351 {
 352         if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
 353                 return 0;
 354
 355         if (helper->fb->funcs->dirty)
 356                 return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
 357
 358         return 0;
 359 }
 360
 361 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 362         .fb_probe = intelfb_create,
 363         .fb_dirty = intelfb_dirty,
 364 };
 365
 366 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 367 {
 368         /* We rely on the object-free to release the VMA pinning for
 369          * the info->screen_base mmaping. Leaking the VMA is simpler than
 370          * trying to rectify all the possible error paths leading here.
 371          */
 372
 373         drm_fb_helper_fini(&ifbdev->helper);
 374
 375         if (ifbdev->vma)
 376                 intel_unpin_fb_vma(ifbdev->vma, ifbdev->vma_flags);
 377
 378         if (ifbdev->fb)
 379                 drm_framebuffer_remove(&ifbdev->fb->base);
 380
 381         drm_fb_helper_unprepare(&ifbdev->helper);
 382         kfree(ifbdev);
 383 }
 384
 385 /*
 386  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 387  * The core display code will have read out the current plane configuration,
 388  * so we use that to figure out if there's an object for us to use as the
 389  * fb, and if so, we re-use it for the fbdev configuration.
 390  *
 391  * Note we only support a single fb shared across pipes for boot (mostly for
 392  * fbcon), so we just find the biggest and use that.
 393  */
 394 static bool intel_fbdev_init_bios(struct drm_device *dev,
 395                                   struct intel_fbdev *ifbdev)
 396 {
 397         struct drm_i915_private *i915 = to_i915(dev);
 398         struct intel_framebuffer *fb = NULL;
 399         struct intel_crtc *crtc;
 400         unsigned int max_size = 0;
 401
 402         /* Find the largest fb */
 403         for_each_intel_crtc(dev, crtc) {
 404                 struct intel_crtc_state *crtc_state =
 405                         to_intel_crtc_state(crtc->base.state);
 406                 struct intel_plane *plane =
 407                         to_intel_plane(crtc->base.primary);
 408                 struct intel_plane_state *plane_state =
 409                         to_intel_plane_state(plane->base.state);
 410                 struct drm_i915_gem_object *obj =
 411                         intel_fb_obj(plane_state->uapi.fb);
 412
 413                 if (!crtc_state->uapi.active) {
 414                         drm_dbg_kms(&i915->drm,
 415                                     "[CRTC:%d:%s] not active, skipping\n",
 416                                     crtc->base.base.id, crtc->base.name);
 417                         continue;
 418                 }
 419
 420                 if (!obj) {
 421                         drm_dbg_kms(&i915->drm,
 422                                     "[PLANE:%d:%s] no fb, skipping\n",
 423                                     plane->base.base.id, plane->base.name);
 424                         continue;
 425                 }
 426
 427                 if (obj->base.size > max_size) {
 428                         drm_dbg_kms(&i915->drm,
 429                                     "found possible fb from [PLANE:%d:%s]\n",
 430                                     plane->base.base.id, plane->base.name);
 431                         fb = to_intel_framebuffer(plane_state->uapi.fb);
 432                         max_size = obj->base.size;
 433                 }
 434         }
 435
 436         if (!fb) {
 437                 drm_dbg_kms(&i915->drm,
 438                             "no active fbs found, not using BIOS config\n");
 439                 goto out;
 440         }
 441
 442         /* Now make sure all the pipes will fit into it */
 443         for_each_intel_crtc(dev, crtc) {
 444                 struct intel_crtc_state *crtc_state =
 445                         to_intel_crtc_state(crtc->base.state);
 446                 struct intel_plane *plane =
 447                         to_intel_plane(crtc->base.primary);
 448                 unsigned int cur_size;
 449
 450                 if (!crtc_state->uapi.active) {
 451                         drm_dbg_kms(&i915->drm,
 452                                     "[CRTC:%d:%s] not active, skipping\n",
 453                                     crtc->base.base.id, crtc->base.name);
 454                         continue;
 455                 }
 456
 457                 drm_dbg_kms(&i915->drm, "checking [PLANE:%d:%s] for BIOS fb\n",
 458                             plane->base.base.id, plane->base.name);
 459
 460                 /*
 461                  * See if the plane fb we found above will fit on this
 462                  * pipe.  Note we need to use the selected fb's pitch and bpp
 463                  * rather than the current pipe's, since they differ.
 464                  */
 465                 cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay;
 466                 cur_size = cur_size * fb->base.format->cpp[0];
 467                 if (fb->base.pitches[0] < cur_size) {
 468                         drm_dbg_kms(&i915->drm,
 469                                     "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n",
 470                                     plane->base.base.id, plane->base.name,
 471                                     cur_size, fb->base.pitches[0]);
 472                         fb = NULL;
 473                         break;
 474                 }
 475
 476                 cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay;
 477                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 478                 cur_size *= fb->base.pitches[0];
 479                 drm_dbg_kms(&i915->drm,
 480                             "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n",
 481                             crtc->base.base.id, crtc->base.name,
 482                             crtc_state->uapi.adjusted_mode.crtc_hdisplay,
 483                             crtc_state->uapi.adjusted_mode.crtc_vdisplay,
 484                             fb->base.format->cpp[0] * 8,
 485                             cur_size);
 486
 487                 if (cur_size > max_size) {
 488                         drm_dbg_kms(&i915->drm,
 489                                     "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n",
 490                                     plane->base.base.id, plane->base.name,
 491                                     cur_size, max_size);
 492                         fb = NULL;
 493                         break;
 494                 }
 495
 496                 drm_dbg_kms(&i915->drm,
 497                             "fb big enough [PLANE:%d:%s] (%d >= %d)\n",
 498                             plane->base.base.id, plane->base.name,
 499                             max_size, cur_size);
 500         }
 501
 502         if (!fb) {
 503                 drm_dbg_kms(&i915->drm,
 504                             "BIOS fb not suitable for all pipes, not using\n");
 505                 goto out;
 506         }
 507
 508         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 509         ifbdev->fb = fb;
 510
 511         drm_framebuffer_get(&ifbdev->fb->base);
 512
 513         /* Final pass to check if any active pipes don't have fbs */
 514         for_each_intel_crtc(dev, crtc) {
 515                 struct intel_crtc_state *crtc_state =
 516                         to_intel_crtc_state(crtc->base.state);
 517                 struct intel_plane *plane =
 518                         to_intel_plane(crtc->base.primary);
 519                 struct intel_plane_state *plane_state =
 520                         to_intel_plane_state(plane->base.state);
 521
 522                 if (!crtc_state->uapi.active)
 523                         continue;
 524
 525                 drm_WARN(dev, !plane_state->uapi.fb,
 526                          "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n",
 527                          plane->base.base.id, plane->base.name);
 528         }
 529
 530
 531         drm_dbg_kms(&i915->drm, "using BIOS fb for initial console\n");
 532         return true;
 533
 534 out:
 535
 536         return false;
 537 }
 538
 539 static void intel_fbdev_suspend_worker(struct work_struct *work)
 540 {
 541         intel_fbdev_set_suspend(&container_of(work,
 542                                               struct drm_i915_private,
 543                                               display.fbdev.suspend_work)->drm,
 544                                 FBINFO_STATE_RUNNING,
 545                                 true);
 546 }
 547
 548 int intel_fbdev_init(struct drm_device *dev)
 549 {
 550         struct drm_i915_private *dev_priv = to_i915(dev);
 551         struct intel_fbdev *ifbdev;
 552         int ret;
 553
 554         if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
 555                 return -ENODEV;
 556
 557         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 558         if (ifbdev == NULL)
 559                 return -ENOMEM;
 560
 561         mutex_init(&ifbdev->hpd_lock);
 562         drm_fb_helper_prepare(dev, &ifbdev->helper, 32, &intel_fb_helper_funcs);
 563
 564         if (intel_fbdev_init_bios(dev, ifbdev))
 565                 ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
 566         else
 567                 ifbdev->preferred_bpp = ifbdev->helper.preferred_bpp;
 568
 569         ret = drm_fb_helper_init(dev, &ifbdev->helper);
 570         if (ret) {
 571                 kfree(ifbdev);
 572                 return ret;
 573         }
 574
 575         dev_priv->display.fbdev.fbdev = ifbdev;
 576         INIT_WORK(&dev_priv->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
 577
 578         return 0;
 579 }
 580
 581 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 582 {
 583         struct intel_fbdev *ifbdev = data;
 584
 585         /* Due to peculiar init order wrt to hpd handling this is separate. */
 586         if (drm_fb_helper_initial_config(&ifbdev->helper))
 587                 intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
 588 }
 589
 590 void intel_fbdev_initial_config_async(struct drm_i915_private *dev_priv)
 591 {
 592         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 593
 594         if (!ifbdev)
 595                 return;
 596
 597         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 598 }
 599
 600 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 601 {
 602         if (!ifbdev->cookie)
 603                 return;
 604
 605         /* Only serialises with all preceding async calls, hence +1 */
 606         async_synchronize_cookie(ifbdev->cookie + 1);
 607         ifbdev->cookie = 0;
 608 }
 609
 610 void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
 611 {
 612         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 613
 614         if (!ifbdev)
 615                 return;
 616
 617         intel_fbdev_set_suspend(&dev_priv->drm, FBINFO_STATE_SUSPENDED, true);
 618
 619         if (!current_is_async())
 620                 intel_fbdev_sync(ifbdev);
 621
 622         drm_fb_helper_unregister_info(&ifbdev->helper);
 623 }
 624
 625 void intel_fbdev_fini(struct drm_i915_private *dev_priv)
 626 {
 627         struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv->display.fbdev.fbdev);
 628
 629         if (!ifbdev)
 630                 return;
 631
 632         intel_fbdev_destroy(ifbdev);
 633 }
 634
 635 /* Suspends/resumes fbdev processing of incoming HPD events. When resuming HPD
 636  * processing, fbdev will perform a full connector reprobe if a hotplug event
 637  * was received while HPD was suspended.
 638  */
 639 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
 640 {
 641         struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev;
 642         bool send_hpd = false;
 643
 644         mutex_lock(&ifbdev->hpd_lock);
 645         ifbdev->hpd_suspended = state == FBINFO_STATE_SUSPENDED;
 646         send_hpd = !ifbdev->hpd_suspended && ifbdev->hpd_waiting;
 647         ifbdev->hpd_waiting = false;
 648         mutex_unlock(&ifbdev->hpd_lock);
 649
 650         if (send_hpd) {
 651                 drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
 652                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 653         }
 654 }
 655
 656 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 657 {
 658         struct drm_i915_private *dev_priv = to_i915(dev);
 659         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 660         struct fb_info *info;
 661
 662         if (!ifbdev)
 663                 return;
 664
 665         if (drm_WARN_ON(&dev_priv->drm, !HAS_DISPLAY(dev_priv)))
 666                 return;
 667
 668         if (!ifbdev->vma)
 669                 goto set_suspend;
 670
 671         info = ifbdev->helper.info;
 672
 673         if (synchronous) {
 674                 /* Flush any pending work to turn the console on, and then
 675                  * wait to turn it off. It must be synchronous as we are
 676                  * about to suspend or unload the driver.
 677                  *
 678                  * Note that from within the work-handler, we cannot flush
 679                  * ourselves, so only flush outstanding work upon suspend!
 680                  */
 681                 if (state != FBINFO_STATE_RUNNING)
 682                         flush_work(&dev_priv->display.fbdev.suspend_work);
 683
 684                 console_lock();
 685         } else {
 686                 /*
 687                  * The console lock can be pretty contented on resume due
 688                  * to all the printk activity.  Try to keep it out of the hot
 689                  * path of resume if possible.
 690                  */
 691                 drm_WARN_ON(dev, state != FBINFO_STATE_RUNNING);
 692                 if (!console_trylock()) {
 693                         /* Don't block our own workqueue as this can
 694                          * be run in parallel with other i915.ko tasks.
 695                          */
 696                         queue_work(dev_priv->unordered_wq,
 697                                    &dev_priv->display.fbdev.suspend_work);
 698                         return;
 699                 }
 700         }
 701
 702         /* On resume from hibernation: If the object is shmemfs backed, it has
 703          * been restored from swap. If the object is stolen however, it will be
 704          * full of whatever garbage was left in there.
 705          */
 706         if (state == FBINFO_STATE_RUNNING &&
 707             !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
 708                 memset_io(info->screen_base, 0, info->screen_size);
 709
 710         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 711         console_unlock();
 712
 713 set_suspend:
 714         intel_fbdev_hpd_set_suspend(dev_priv, state);
 715 }
 716
 717 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 718 {
 719         struct intel_fbdev *ifbdev = to_i915(dev)->display.fbdev.fbdev;
 720         bool send_hpd;
 721
 722         if (!ifbdev)
 723                 return;
 724
 725         intel_fbdev_sync(ifbdev);
 726
 727         mutex_lock(&ifbdev->hpd_lock);
 728         send_hpd = !ifbdev->hpd_suspended;
 729         ifbdev->hpd_waiting = true;
 730         mutex_unlock(&ifbdev->hpd_lock);
 731
 732         if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
 733                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 734 }
 735
 736 void intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
 737 {
 738         struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
 739
 740         if (!ifbdev)
 741                 return;
 742
 743         intel_fbdev_sync(ifbdev);
 744         if (!ifbdev->vma)
 745                 return;
 746
 747         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 748                 intel_fbdev_invalidate(ifbdev);
 749 }
 750
 751 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
 752 {
 753         if (!fbdev || !fbdev->helper.fb)
 754                 return NULL;
 755
 756         return to_intel_framebuffer(fbdev->helper.fb);
 757 }