drivers/gpu/drm/i915/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/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/console.h>
  31 #include <linux/errno.h>
  32 #include <linux/string.h>
  33 #include <linux/mm.h>
  34 #include <linux/tty.h>
  35 #include <linux/sysrq.h>
  36 #include <linux/delay.h>
  37 #include <linux/fb.h>
  38 #include <linux/init.h>
  39 #include <linux/vga_switcheroo.h>
  40
  41 #include <drm/drmP.h>
  42 #include <drm/drm_crtc.h>
  43 #include <drm/drm_fb_helper.h>
  44 #include "intel_drv.h"
  45 #include <drm/i915_drm.h>
  46 #include "i915_drv.h"
  47
  48 static int intel_fbdev_set_par(struct fb_info *info)
  49 {
  50         struct drm_fb_helper *fb_helper = info->par;
  51         struct intel_fbdev *ifbdev =
  52                 container_of(fb_helper, struct intel_fbdev, helper);
  53         int ret;
  54
  55         ret = drm_fb_helper_set_par(info);
  56
  57         if (ret == 0) {
  58                 mutex_lock(&fb_helper->dev->struct_mutex);
  59                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  60                 mutex_unlock(&fb_helper->dev->struct_mutex);
  61         }
  62
  63         return ret;
  64 }
  65
  66 static int intel_fbdev_blank(int blank, struct fb_info *info)
  67 {
  68         struct drm_fb_helper *fb_helper = info->par;
  69         struct intel_fbdev *ifbdev =
  70                 container_of(fb_helper, struct intel_fbdev, helper);
  71         int ret;
  72
  73         ret = drm_fb_helper_blank(blank, info);
  74
  75         if (ret == 0) {
  76                 mutex_lock(&fb_helper->dev->struct_mutex);
  77                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  78                 mutex_unlock(&fb_helper->dev->struct_mutex);
  79         }
  80
  81         return ret;
  82 }
  83
  84 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  85                                    struct fb_info *info)
  86 {
  87         struct drm_fb_helper *fb_helper = info->par;
  88         struct intel_fbdev *ifbdev =
  89                 container_of(fb_helper, struct intel_fbdev, helper);
  90
  91         int ret;
  92         ret = drm_fb_helper_pan_display(var, info);
  93
  94         if (ret == 0) {
  95                 mutex_lock(&fb_helper->dev->struct_mutex);
  96                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  97                 mutex_unlock(&fb_helper->dev->struct_mutex);
  98         }
  99
 100         return ret;
 101 }
 102
 103 static struct fb_ops intelfb_ops = {
 104         .owner = THIS_MODULE,
 105         .fb_check_var = drm_fb_helper_check_var,
 106         .fb_set_par = intel_fbdev_set_par,
 107         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 108         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 109         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 110         .fb_pan_display = intel_fbdev_pan_display,
 111         .fb_blank = intel_fbdev_blank,
 112         .fb_setcmap = drm_fb_helper_setcmap,
 113         .fb_debug_enter = drm_fb_helper_debug_enter,
 114         .fb_debug_leave = drm_fb_helper_debug_leave,
 115 };
 116
 117 static int intelfb_alloc(struct drm_fb_helper *helper,
 118                          struct drm_fb_helper_surface_size *sizes)
 119 {
 120         struct intel_fbdev *ifbdev =
 121                 container_of(helper, struct intel_fbdev, helper);
 122         struct drm_framebuffer *fb;
 123         struct drm_device *dev = helper->dev;
 124         struct drm_i915_private *dev_priv = to_i915(dev);
 125         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 126         struct drm_mode_fb_cmd2 mode_cmd = {};
 127         struct drm_i915_gem_object *obj = NULL;
 128         int size, ret;
 129
 130         /* we don't do packed 24bpp */
 131         if (sizes->surface_bpp == 24)
 132                 sizes->surface_bpp = 32;
 133
 134         mode_cmd.width = sizes->surface_width;
 135         mode_cmd.height = sizes->surface_height;
 136
 137         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 138                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 139         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 140                                                           sizes->surface_depth);
 141
 142         mutex_lock(&dev->struct_mutex);
 143
 144         size = mode_cmd.pitches[0] * mode_cmd.height;
 145         size = PAGE_ALIGN(size);
 146
 147         /* If the FB is too big, just don't use it since fbdev is not very
 148          * important and we should probably use that space with FBC or other
 149          * features. */
 150         if (size * 2 < ggtt->stolen_usable_size)
 151                 obj = i915_gem_object_create_stolen(dev, size);
 152         if (obj == NULL)
 153                 obj = i915_gem_object_create(dev, size);
 154         if (IS_ERR(obj)) {
 155                 DRM_ERROR("failed to allocate framebuffer\n");
 156                 ret = PTR_ERR(obj);
 157                 goto out;
 158         }
 159
 160         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 161         if (IS_ERR(fb)) {
 162                 drm_gem_object_unreference(&obj->base);
 163                 ret = PTR_ERR(fb);
 164                 goto out;
 165         }
 166
 167         mutex_unlock(&dev->struct_mutex);
 168
 169         ifbdev->fb = to_intel_framebuffer(fb);
 170
 171         return 0;
 172
 173 out:
 174         mutex_unlock(&dev->struct_mutex);
 175         return ret;
 176 }
 177
 178 static int intelfb_create(struct drm_fb_helper *helper,
 179                           struct drm_fb_helper_surface_size *sizes)
 180 {
 181         struct intel_fbdev *ifbdev =
 182                 container_of(helper, struct intel_fbdev, helper);
 183         struct intel_framebuffer *intel_fb = ifbdev->fb;
 184         struct drm_device *dev = helper->dev;
 185         struct drm_i915_private *dev_priv = to_i915(dev);
 186         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 187         struct fb_info *info;
 188         struct drm_framebuffer *fb;
 189         struct i915_vma *vma;
 190         struct drm_i915_gem_object *obj;
 191         bool prealloc = false;
 192         void *vaddr;
 193         int ret;
 194
 195         if (intel_fb &&
 196             (sizes->fb_width > intel_fb->base.width ||
 197              sizes->fb_height > intel_fb->base.height)) {
 198                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 199                               " releasing it\n",
 200                               intel_fb->base.width, intel_fb->base.height,
 201                               sizes->fb_width, sizes->fb_height);
 202                 drm_framebuffer_unreference(&intel_fb->base);
 203                 intel_fb = ifbdev->fb = NULL;
 204         }
 205         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 206                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 207                 ret = intelfb_alloc(helper, sizes);
 208                 if (ret)
 209                         return ret;
 210                 intel_fb = ifbdev->fb;
 211         } else {
 212                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 213                 prealloc = true;
 214                 sizes->fb_width = intel_fb->base.width;
 215                 sizes->fb_height = intel_fb->base.height;
 216         }
 217
 218         obj = intel_fb->obj;
 219
 220         mutex_lock(&dev->struct_mutex);
 221
 222         /* Pin the GGTT vma for our access via info->screen_base.
 223          * This also validates that any existing fb inherited from the
 224          * BIOS is suitable for own access.
 225          */
 226         ret = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, BIT(DRM_ROTATE_0));
 227         if (ret)
 228                 goto out_unlock;
 229
 230         info = drm_fb_helper_alloc_fbi(helper);
 231         if (IS_ERR(info)) {
 232                 DRM_ERROR("Failed to allocate fb_info\n");
 233                 ret = PTR_ERR(info);
 234                 goto out_unpin;
 235         }
 236
 237         info->par = helper;
 238
 239         fb = &ifbdev->fb->base;
 240
 241         ifbdev->helper.fb = fb;
 242
 243         strcpy(info->fix.id, "inteldrmfb");
 244
 245         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 246         info->fbops = &intelfb_ops;
 247
 248         vma = i915_gem_obj_to_ggtt(obj);
 249
 250         /* setup aperture base/size for vesafb takeover */
 251         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 252         info->apertures->ranges[0].size = ggtt->mappable_end;
 253
 254         info->fix.smem_start = dev->mode_config.fb_base + vma->node.start;
 255         info->fix.smem_len = vma->node.size;
 256
 257         vaddr = i915_vma_pin_iomap(vma);
 258         if (IS_ERR(vaddr)) {
 259                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 260                 ret = PTR_ERR(vaddr);
 261                 goto out_destroy_fbi;
 262         }
 263         info->screen_base = vaddr;
 264         info->screen_size = vma->node.size;
 265
 266         /* This driver doesn't need a VT switch to restore the mode on resume */
 267         info->skip_vt_switch = true;
 268
 269         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 270         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 271
 272         /* If the object is shmemfs backed, it will have given us zeroed pages.
 273          * If the object is stolen however, it will be full of whatever
 274          * garbage was left in there.
 275          */
 276         if (ifbdev->fb->obj->stolen && !prealloc)
 277                 memset_io(info->screen_base, 0, info->screen_size);
 278
 279         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 280
 281         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08llx, bo %p\n",
 282                       fb->width, fb->height,
 283                       i915_gem_obj_ggtt_offset(obj), obj);
 284
 285         mutex_unlock(&dev->struct_mutex);
 286         vga_switcheroo_client_fb_set(dev->pdev, info);
 287         return 0;
 288
 289 out_destroy_fbi:
 290         drm_fb_helper_release_fbi(helper);
 291 out_unpin:
 292         intel_unpin_fb_obj(&ifbdev->fb->base, BIT(DRM_ROTATE_0));
 293 out_unlock:
 294         mutex_unlock(&dev->struct_mutex);
 295         return ret;
 296 }
 297
 298 /** Sets the color ramps on behalf of RandR */
 299 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 300                                     u16 blue, int regno)
 301 {
 302         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 303
 304         intel_crtc->lut_r[regno] = red >> 8;
 305         intel_crtc->lut_g[regno] = green >> 8;
 306         intel_crtc->lut_b[regno] = blue >> 8;
 307 }
 308
 309 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 310                                     u16 *blue, int regno)
 311 {
 312         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 313
 314         *red = intel_crtc->lut_r[regno] << 8;
 315         *green = intel_crtc->lut_g[regno] << 8;
 316         *blue = intel_crtc->lut_b[regno] << 8;
 317 }
 318
 319 static struct drm_fb_helper_crtc *
 320 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 321 {
 322         int i;
 323
 324         for (i = 0; i < fb_helper->crtc_count; i++)
 325                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 326                         return &fb_helper->crtc_info[i];
 327
 328         return NULL;
 329 }
 330
 331 /*
 332  * Try to read the BIOS display configuration and use it for the initial
 333  * fb configuration.
 334  *
 335  * The BIOS or boot loader will generally create an initial display
 336  * configuration for us that includes some set of active pipes and displays.
 337  * This routine tries to figure out which pipes and connectors are active
 338  * and stuffs them into the crtcs and modes array given to us by the
 339  * drm_fb_helper code.
 340  *
 341  * The overall sequence is:
 342  *   intel_fbdev_init - from driver load
 343  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 344  *     drm_fb_helper_init - build fb helper structs
 345  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 346  *   intel_fbdev_initial_config - apply the config
 347  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 348  *         drm_setup_crtcs - build crtc config for fbdev
 349  *           intel_fb_initial_config - find active connectors etc
 350  *         drm_fb_helper_single_fb_probe - set up fbdev
 351  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 352  *
 353  * Note that we don't make special consideration whether we could actually
 354  * switch to the selected modes without a full modeset. E.g. when the display
 355  * is in VGA mode we need to recalculate watermarks and set a new high-res
 356  * framebuffer anyway.
 357  */
 358 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 359                                     struct drm_fb_helper_crtc **crtcs,
 360                                     struct drm_display_mode **modes,
 361                                     struct drm_fb_offset *offsets,
 362                                     bool *enabled, int width, int height)
 363 {
 364         struct drm_device *dev = fb_helper->dev;
 365         unsigned long conn_configured, mask;
 366         unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
 367         int i, j;
 368         bool *save_enabled;
 369         bool fallback = true;
 370         int num_connectors_enabled = 0;
 371         int num_connectors_detected = 0;
 372         int pass = 0;
 373
 374         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
 375         if (!save_enabled)
 376                 return false;
 377
 378         memcpy(save_enabled, enabled, count);
 379         mask = BIT(count) - 1;
 380         conn_configured = 0;
 381 retry:
 382         for (i = 0; i < count; i++) {
 383                 struct drm_fb_helper_connector *fb_conn;
 384                 struct drm_connector *connector;
 385                 struct drm_encoder *encoder;
 386                 struct drm_fb_helper_crtc *new_crtc;
 387                 struct intel_crtc *intel_crtc;
 388
 389                 fb_conn = fb_helper->connector_info[i];
 390                 connector = fb_conn->connector;
 391
 392                 if (conn_configured & BIT(i))
 393                         continue;
 394
 395                 if (pass == 0 && !connector->has_tile)
 396                         continue;
 397
 398                 if (connector->status == connector_status_connected)
 399                         num_connectors_detected++;
 400
 401                 if (!enabled[i]) {
 402                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 403                                       connector->name);
 404                         conn_configured |= BIT(i);
 405                         continue;
 406                 }
 407
 408                 if (connector->force == DRM_FORCE_OFF) {
 409                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 410                                       connector->name);
 411                         enabled[i] = false;
 412                         continue;
 413                 }
 414
 415                 encoder = connector->state->best_encoder;
 416                 if (!encoder || WARN_ON(!connector->state->crtc)) {
 417                         if (connector->force > DRM_FORCE_OFF)
 418                                 goto bail;
 419
 420                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 421                                       connector->name);
 422                         enabled[i] = false;
 423                         conn_configured |= BIT(i);
 424                         continue;
 425                 }
 426
 427                 num_connectors_enabled++;
 428
 429                 intel_crtc = to_intel_crtc(connector->state->crtc);
 430                 for (j = 0; j < 256; j++) {
 431                         intel_crtc->lut_r[j] = j;
 432                         intel_crtc->lut_g[j] = j;
 433                         intel_crtc->lut_b[j] = j;
 434                 }
 435
 436                 new_crtc = intel_fb_helper_crtc(fb_helper,
 437                                                 connector->state->crtc);
 438
 439                 /*
 440                  * Make sure we're not trying to drive multiple connectors
 441                  * with a single CRTC, since our cloning support may not
 442                  * match the BIOS.
 443                  */
 444                 for (j = 0; j < count; j++) {
 445                         if (crtcs[j] == new_crtc) {
 446                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 447                                 goto bail;
 448                         }
 449                 }
 450
 451                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 452                               connector->name);
 453
 454                 /* go for command line mode first */
 455                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 456
 457                 /* try for preferred next */
 458                 if (!modes[i]) {
 459                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 460                                       connector->name, connector->has_tile);
 461                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 462                                                           height);
 463                 }
 464
 465                 /* No preferred mode marked by the EDID? Are there any modes? */
 466                 if (!modes[i] && !list_empty(&connector->modes)) {
 467                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 468                                       connector->name);
 469                         modes[i] = list_first_entry(&connector->modes,
 470                                                     struct drm_display_mode,
 471                                                     head);
 472                 }
 473
 474                 /* last resort: use current mode */
 475                 if (!modes[i]) {
 476                         /*
 477                          * IMPORTANT: We want to use the adjusted mode (i.e.
 478                          * after the panel fitter upscaling) as the initial
 479                          * config, not the input mode, which is what crtc->mode
 480                          * usually contains. But since our current
 481                          * code puts a mode derived from the post-pfit timings
 482                          * into crtc->mode this works out correctly.
 483                          *
 484                          * This is crtc->mode and not crtc->state->mode for the
 485                          * fastboot check to work correctly. crtc_state->mode has
 486                          * I915_MODE_FLAG_INHERITED, which we clear to force check
 487                          * state.
 488                          */
 489                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 490                                       connector->name);
 491                         modes[i] = &connector->state->crtc->mode;
 492                 }
 493                 crtcs[i] = new_crtc;
 494
 495                 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
 496                               connector->name,
 497                               connector->state->crtc->base.id,
 498                               connector->state->crtc->name,
 499                               modes[i]->hdisplay, modes[i]->vdisplay,
 500                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 501
 502                 fallback = false;
 503                 conn_configured |= BIT(i);
 504         }
 505
 506         if ((conn_configured & mask) != mask) {
 507                 pass++;
 508                 goto retry;
 509         }
 510
 511         /*
 512          * If the BIOS didn't enable everything it could, fall back to have the
 513          * same user experiencing of lighting up as much as possible like the
 514          * fbdev helper library.
 515          */
 516         if (num_connectors_enabled != num_connectors_detected &&
 517             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 518                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 519                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 520                               num_connectors_detected);
 521                 fallback = true;
 522         }
 523
 524         if (fallback) {
 525 bail:
 526                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 527                 memcpy(enabled, save_enabled, count);
 528                 kfree(save_enabled);
 529                 return false;
 530         }
 531
 532         kfree(save_enabled);
 533         return true;
 534 }
 535
 536 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 537         .initial_config = intel_fb_initial_config,
 538         .gamma_set = intel_crtc_fb_gamma_set,
 539         .gamma_get = intel_crtc_fb_gamma_get,
 540         .fb_probe = intelfb_create,
 541 };
 542
 543 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 544 {
 545         /* We rely on the object-free to release the VMA pinning for
 546          * the info->screen_base mmaping. Leaking the VMA is simpler than
 547          * trying to rectify all the possible error paths leading here.
 548          */
 549
 550         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 551         drm_fb_helper_release_fbi(&ifbdev->helper);
 552
 553         drm_fb_helper_fini(&ifbdev->helper);
 554
 555         if (ifbdev->fb) {
 556                 mutex_lock(&ifbdev->helper.dev->struct_mutex);
 557                 intel_unpin_fb_obj(&ifbdev->fb->base, BIT(DRM_ROTATE_0));
 558                 mutex_unlock(&ifbdev->helper.dev->struct_mutex);
 559
 560                 drm_framebuffer_remove(&ifbdev->fb->base);
 561         }
 562
 563         kfree(ifbdev);
 564 }
 565
 566 /*
 567  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 568  * The core display code will have read out the current plane configuration,
 569  * so we use that to figure out if there's an object for us to use as the
 570  * fb, and if so, we re-use it for the fbdev configuration.
 571  *
 572  * Note we only support a single fb shared across pipes for boot (mostly for
 573  * fbcon), so we just find the biggest and use that.
 574  */
 575 static bool intel_fbdev_init_bios(struct drm_device *dev,
 576                                  struct intel_fbdev *ifbdev)
 577 {
 578         struct intel_framebuffer *fb = NULL;
 579         struct drm_crtc *crtc;
 580         struct intel_crtc *intel_crtc;
 581         unsigned int max_size = 0;
 582
 583         /* Find the largest fb */
 584         for_each_crtc(dev, crtc) {
 585                 struct drm_i915_gem_object *obj =
 586                         intel_fb_obj(crtc->primary->state->fb);
 587                 intel_crtc = to_intel_crtc(crtc);
 588
 589                 if (!crtc->state->active || !obj) {
 590                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 591                                       pipe_name(intel_crtc->pipe));
 592                         continue;
 593                 }
 594
 595                 if (obj->base.size > max_size) {
 596                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 597                                       pipe_name(intel_crtc->pipe));
 598                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 599                         max_size = obj->base.size;
 600                 }
 601         }
 602
 603         if (!fb) {
 604                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 605                 goto out;
 606         }
 607
 608         /* Now make sure all the pipes will fit into it */
 609         for_each_crtc(dev, crtc) {
 610                 unsigned int cur_size;
 611
 612                 intel_crtc = to_intel_crtc(crtc);
 613
 614                 if (!crtc->state->active) {
 615                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 616                                       pipe_name(intel_crtc->pipe));
 617                         continue;
 618                 }
 619
 620                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 621                               pipe_name(intel_crtc->pipe));
 622
 623                 /*
 624                  * See if the plane fb we found above will fit on this
 625                  * pipe.  Note we need to use the selected fb's pitch and bpp
 626                  * rather than the current pipe's, since they differ.
 627                  */
 628                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 629                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 630                 if (fb->base.pitches[0] < cur_size) {
 631                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 632                                       pipe_name(intel_crtc->pipe),
 633                                       cur_size, fb->base.pitches[0]);
 634                         fb = NULL;
 635                         break;
 636                 }
 637
 638                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 639                 cur_size = intel_fb_align_height(dev, cur_size,
 640                                                  fb->base.pixel_format,
 641                                                  fb->base.modifier[0]);
 642                 cur_size *= fb->base.pitches[0];
 643                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 644                               pipe_name(intel_crtc->pipe),
 645                               intel_crtc->config->base.adjusted_mode.crtc_hdisplay,
 646                               intel_crtc->config->base.adjusted_mode.crtc_vdisplay,
 647                               fb->base.bits_per_pixel,
 648                               cur_size);
 649
 650                 if (cur_size > max_size) {
 651                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 652                                       pipe_name(intel_crtc->pipe),
 653                                       cur_size, max_size);
 654                         fb = NULL;
 655                         break;
 656                 }
 657
 658                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 659                               pipe_name(intel_crtc->pipe),
 660                               max_size, cur_size);
 661         }
 662
 663         if (!fb) {
 664                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 665                 goto out;
 666         }
 667
 668         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 669         ifbdev->fb = fb;
 670
 671         drm_framebuffer_reference(&ifbdev->fb->base);
 672
 673         /* Final pass to check if any active pipes don't have fbs */
 674         for_each_crtc(dev, crtc) {
 675                 intel_crtc = to_intel_crtc(crtc);
 676
 677                 if (!crtc->state->active)
 678                         continue;
 679
 680                 WARN(!crtc->primary->fb,
 681                      "re-used BIOS config but lost an fb on crtc %d\n",
 682                      crtc->base.id);
 683         }
 684
 685
 686         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 687         return true;
 688
 689 out:
 690
 691         return false;
 692 }
 693
 694 static void intel_fbdev_suspend_worker(struct work_struct *work)
 695 {
 696         intel_fbdev_set_suspend(&container_of(work,
 697                                               struct drm_i915_private,
 698                                               fbdev_suspend_work)->drm,
 699                                 FBINFO_STATE_RUNNING,
 700                                 true);
 701 }
 702
 703 int intel_fbdev_init(struct drm_device *dev)
 704 {
 705         struct intel_fbdev *ifbdev;
 706         struct drm_i915_private *dev_priv = to_i915(dev);
 707         int ret;
 708
 709         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 710                 return -ENODEV;
 711
 712         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 713         if (ifbdev == NULL)
 714                 return -ENOMEM;
 715
 716         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 717
 718         if (!intel_fbdev_init_bios(dev, ifbdev))
 719                 ifbdev->preferred_bpp = 32;
 720
 721         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 722                                  INTEL_INFO(dev)->num_pipes, 4);
 723         if (ret) {
 724                 kfree(ifbdev);
 725                 return ret;
 726         }
 727
 728         dev_priv->fbdev = ifbdev;
 729         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 730
 731         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 732
 733         return 0;
 734 }
 735
 736 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 737 {
 738         struct intel_fbdev *ifbdev = data;
 739
 740         /* Due to peculiar init order wrt to hpd handling this is separate. */
 741         if (drm_fb_helper_initial_config(&ifbdev->helper,
 742                                          ifbdev->preferred_bpp))
 743                 intel_fbdev_fini(ifbdev->helper.dev);
 744 }
 745
 746 void intel_fbdev_initial_config_async(struct drm_device *dev)
 747 {
 748         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 749
 750         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 751 }
 752
 753 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 754 {
 755         if (!ifbdev->cookie)
 756                 return;
 757
 758         /* Only serialises with all preceding async calls, hence +1 */
 759         async_synchronize_cookie(ifbdev->cookie + 1);
 760         ifbdev->cookie = 0;
 761 }
 762
 763 void intel_fbdev_fini(struct drm_device *dev)
 764 {
 765         struct drm_i915_private *dev_priv = to_i915(dev);
 766         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 767
 768         if (!ifbdev)
 769                 return;
 770
 771         flush_work(&dev_priv->fbdev_suspend_work);
 772         if (!current_is_async())
 773                 intel_fbdev_sync(ifbdev);
 774
 775         intel_fbdev_destroy(ifbdev);
 776         dev_priv->fbdev = NULL;
 777 }
 778
 779 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 780 {
 781         struct drm_i915_private *dev_priv = to_i915(dev);
 782         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 783         struct fb_info *info;
 784
 785         if (!ifbdev)
 786                 return;
 787
 788         info = ifbdev->helper.fbdev;
 789
 790         if (synchronous) {
 791                 /* Flush any pending work to turn the console on, and then
 792                  * wait to turn it off. It must be synchronous as we are
 793                  * about to suspend or unload the driver.
 794                  *
 795                  * Note that from within the work-handler, we cannot flush
 796                  * ourselves, so only flush outstanding work upon suspend!
 797                  */
 798                 if (state != FBINFO_STATE_RUNNING)
 799                         flush_work(&dev_priv->fbdev_suspend_work);
 800                 console_lock();
 801         } else {
 802                 /*
 803                  * The console lock can be pretty contented on resume due
 804                  * to all the printk activity.  Try to keep it out of the hot
 805                  * path of resume if possible.
 806                  */
 807                 WARN_ON(state != FBINFO_STATE_RUNNING);
 808                 if (!console_trylock()) {
 809                         /* Don't block our own workqueue as this can
 810                          * be run in parallel with other i915.ko tasks.
 811                          */
 812                         schedule_work(&dev_priv->fbdev_suspend_work);
 813                         return;
 814                 }
 815         }
 816
 817         /* On resume from hibernation: If the object is shmemfs backed, it has
 818          * been restored from swap. If the object is stolen however, it will be
 819          * full of whatever garbage was left in there.
 820          */
 821         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 822                 memset_io(info->screen_base, 0, info->screen_size);
 823
 824         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 825         console_unlock();
 826 }
 827
 828 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 829 {
 830         struct drm_i915_private *dev_priv = to_i915(dev);
 831         if (dev_priv->fbdev)
 832                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 833 }
 834
 835 void intel_fbdev_restore_mode(struct drm_device *dev)
 836 {
 837         int ret;
 838         struct drm_i915_private *dev_priv = to_i915(dev);
 839         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 840         struct drm_fb_helper *fb_helper;
 841
 842         if (!ifbdev)
 843                 return;
 844
 845         intel_fbdev_sync(ifbdev);
 846
 847         fb_helper = &ifbdev->helper;
 848
 849         ret = drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
 850         if (ret) {
 851                 DRM_DEBUG("failed to restore crtc mode\n");
 852         } else {
 853                 mutex_lock(&fb_helper->dev->struct_mutex);
 854                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 855                 mutex_unlock(&fb_helper->dev->struct_mutex);
 856         }
 857 }