kernel/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                 /*
  59                  * FIXME: fbdev presumes that all callbacks also work from
  60                  * atomic contexts and relies on that for emergency oops
  61                  * printing. KMS totally doesn't do that and the locking here is
  62                  * by far not the only place this goes wrong.  Ignore this for
  63                  * now until we solve this for real.
  64                  */
  65                 mutex_lock(&fb_helper->dev->struct_mutex);
  66                 ret = i915_gem_object_set_to_gtt_domain(ifbdev->fb->obj,
  67                                                         true);
  68                 mutex_unlock(&fb_helper->dev->struct_mutex);
  69         }
  70
  71         return ret;
  72 }
  73
  74 static int intel_fbdev_blank(int blank, struct fb_info *info)
  75 {
  76         struct drm_fb_helper *fb_helper = info->par;
  77         struct intel_fbdev *ifbdev =
  78                 container_of(fb_helper, struct intel_fbdev, helper);
  79         int ret;
  80
  81         ret = drm_fb_helper_blank(blank, info);
  82
  83         if (ret == 0) {
  84                 /*
  85                  * FIXME: fbdev presumes that all callbacks also work from
  86                  * atomic contexts and relies on that for emergency oops
  87                  * printing. KMS totally doesn't do that and the locking here is
  88                  * by far not the only place this goes wrong.  Ignore this for
  89                  * now until we solve this for real.
  90                  */
  91                 mutex_lock(&fb_helper->dev->struct_mutex);
  92                 intel_fb_obj_invalidate(ifbdev->fb->obj, NULL, ORIGIN_GTT);
  93                 mutex_unlock(&fb_helper->dev->struct_mutex);
  94         }
  95
  96         return ret;
  97 }
  98
  99 static struct fb_ops intelfb_ops = {
 100         .owner = THIS_MODULE,
 101         .fb_check_var = drm_fb_helper_check_var,
 102         .fb_set_par = intel_fbdev_set_par,
 103         .fb_fillrect = cfb_fillrect,
 104         .fb_copyarea = cfb_copyarea,
 105         .fb_imageblit = cfb_imageblit,
 106         .fb_pan_display = drm_fb_helper_pan_display,
 107         .fb_blank = intel_fbdev_blank,
 108         .fb_setcmap = drm_fb_helper_setcmap,
 109         .fb_debug_enter = drm_fb_helper_debug_enter,
 110         .fb_debug_leave = drm_fb_helper_debug_leave,
 111 };
 112
 113 static int intelfb_alloc(struct drm_fb_helper *helper,
 114                          struct drm_fb_helper_surface_size *sizes)
 115 {
 116         struct intel_fbdev *ifbdev =
 117                 container_of(helper, struct intel_fbdev, helper);
 118         struct drm_framebuffer *fb;
 119         struct drm_device *dev = helper->dev;
 120         struct drm_mode_fb_cmd2 mode_cmd = {};
 121         struct drm_i915_gem_object *obj;
 122         int size, ret;
 123
 124         /* we don't do packed 24bpp */
 125         if (sizes->surface_bpp == 24)
 126                 sizes->surface_bpp = 32;
 127
 128         mode_cmd.width = sizes->surface_width;
 129         mode_cmd.height = sizes->surface_height;
 130
 131         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 132                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 133         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 134                                                           sizes->surface_depth);
 135
 136         size = mode_cmd.pitches[0] * mode_cmd.height;
 137         size = PAGE_ALIGN(size);
 138         obj = i915_gem_object_create_stolen(dev, size);
 139         if (obj == NULL)
 140                 obj = i915_gem_alloc_object(dev, size);
 141         if (!obj) {
 142                 DRM_ERROR("failed to allocate framebuffer\n");
 143                 ret = -ENOMEM;
 144                 goto out;
 145         }
 146
 147         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 148         if (IS_ERR(fb)) {
 149                 ret = PTR_ERR(fb);
 150                 goto out_unref;
 151         }
 152
 153         /* Flush everything out, we'll be doing GTT only from now on */
 154         ret = intel_pin_and_fence_fb_obj(NULL, fb, NULL, NULL);
 155         if (ret) {
 156                 DRM_ERROR("failed to pin obj: %d\n", ret);
 157                 goto out_fb;
 158         }
 159
 160         ifbdev->fb = to_intel_framebuffer(fb);
 161
 162         return 0;
 163
 164 out_fb:
 165         drm_framebuffer_remove(fb);
 166 out_unref:
 167         drm_gem_object_unreference(&obj->base);
 168 out:
 169         return ret;
 170 }
 171
 172 static int intelfb_create(struct drm_fb_helper *helper,
 173                           struct drm_fb_helper_surface_size *sizes)
 174 {
 175         struct intel_fbdev *ifbdev =
 176                 container_of(helper, struct intel_fbdev, helper);
 177         struct intel_framebuffer *intel_fb = ifbdev->fb;
 178         struct drm_device *dev = helper->dev;
 179         struct drm_i915_private *dev_priv = dev->dev_private;
 180         struct fb_info *info;
 181         struct drm_framebuffer *fb;
 182         struct drm_i915_gem_object *obj;
 183         int size, ret;
 184         bool prealloc = false;
 185
 186         mutex_lock(&dev->struct_mutex);
 187
 188         if (intel_fb &&
 189             (sizes->fb_width > intel_fb->base.width ||
 190              sizes->fb_height > intel_fb->base.height)) {
 191                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 192                               " releasing it\n",
 193                               intel_fb->base.width, intel_fb->base.height,
 194                               sizes->fb_width, sizes->fb_height);
 195                 drm_framebuffer_unreference(&intel_fb->base);
 196                 intel_fb = ifbdev->fb = NULL;
 197         }
 198         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 199                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 200                 ret = intelfb_alloc(helper, sizes);
 201                 if (ret)
 202                         goto out_unlock;
 203                 intel_fb = ifbdev->fb;
 204         } else {
 205                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 206                 prealloc = true;
 207                 sizes->fb_width = intel_fb->base.width;
 208                 sizes->fb_height = intel_fb->base.height;
 209         }
 210
 211         obj = intel_fb->obj;
 212         size = obj->base.size;
 213
 214         info = framebuffer_alloc(0, &dev->pdev->dev);
 215         if (!info) {
 216                 ret = -ENOMEM;
 217                 goto out_unpin;
 218         }
 219
 220         info->par = helper;
 221
 222         fb = &ifbdev->fb->base;
 223
 224         ifbdev->helper.fb = fb;
 225         ifbdev->helper.fbdev = info;
 226
 227         strcpy(info->fix.id, "inteldrmfb");
 228
 229         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 230         info->fbops = &intelfb_ops;
 231
 232         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 233         if (ret) {
 234                 ret = -ENOMEM;
 235                 goto out_unpin;
 236         }
 237         /* setup aperture base/size for vesafb takeover */
 238         info->apertures = alloc_apertures(1);
 239         if (!info->apertures) {
 240                 ret = -ENOMEM;
 241                 goto out_unpin;
 242         }
 243         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 244         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 245
 246         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 247         info->fix.smem_len = size;
 248
 249         info->screen_base =
 250                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 251                            size);
 252         if (!info->screen_base) {
 253                 ret = -ENOSPC;
 254                 goto out_unpin;
 255         }
 256         info->screen_size = size;
 257
 258         /* This driver doesn't need a VT switch to restore the mode on resume */
 259         info->skip_vt_switch = true;
 260
 261         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 262         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 263
 264         /* If the object is shmemfs backed, it will have given us zeroed pages.
 265          * If the object is stolen however, it will be full of whatever
 266          * garbage was left in there.
 267          */
 268         if (ifbdev->fb->obj->stolen && !prealloc)
 269                 memset_io(info->screen_base, 0, info->screen_size);
 270
 271         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 272
 273         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
 274                       fb->width, fb->height,
 275                       i915_gem_obj_ggtt_offset(obj), obj);
 276
 277         mutex_unlock(&dev->struct_mutex);
 278         vga_switcheroo_client_fb_set(dev->pdev, info);
 279         return 0;
 280
 281 out_unpin:
 282         i915_gem_object_ggtt_unpin(obj);
 283         drm_gem_object_unreference(&obj->base);
 284 out_unlock:
 285         mutex_unlock(&dev->struct_mutex);
 286         return ret;
 287 }
 288
 289 /** Sets the color ramps on behalf of RandR */
 290 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 291                                     u16 blue, int regno)
 292 {
 293         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 294
 295         intel_crtc->lut_r[regno] = red >> 8;
 296         intel_crtc->lut_g[regno] = green >> 8;
 297         intel_crtc->lut_b[regno] = blue >> 8;
 298 }
 299
 300 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 301                                     u16 *blue, int regno)
 302 {
 303         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 304
 305         *red = intel_crtc->lut_r[regno] << 8;
 306         *green = intel_crtc->lut_g[regno] << 8;
 307         *blue = intel_crtc->lut_b[regno] << 8;
 308 }
 309
 310 static struct drm_fb_helper_crtc *
 311 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 312 {
 313         int i;
 314
 315         for (i = 0; i < fb_helper->crtc_count; i++)
 316                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 317                         return &fb_helper->crtc_info[i];
 318
 319         return NULL;
 320 }
 321
 322 /*
 323  * Try to read the BIOS display configuration and use it for the initial
 324  * fb configuration.
 325  *
 326  * The BIOS or boot loader will generally create an initial display
 327  * configuration for us that includes some set of active pipes and displays.
 328  * This routine tries to figure out which pipes and connectors are active
 329  * and stuffs them into the crtcs and modes array given to us by the
 330  * drm_fb_helper code.
 331  *
 332  * The overall sequence is:
 333  *   intel_fbdev_init - from driver load
 334  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 335  *     drm_fb_helper_init - build fb helper structs
 336  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 337  *   intel_fbdev_initial_config - apply the config
 338  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 339  *         drm_setup_crtcs - build crtc config for fbdev
 340  *           intel_fb_initial_config - find active connectors etc
 341  *         drm_fb_helper_single_fb_probe - set up fbdev
 342  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 343  *
 344  * Note that we don't make special consideration whether we could actually
 345  * switch to the selected modes without a full modeset. E.g. when the display
 346  * is in VGA mode we need to recalculate watermarks and set a new high-res
 347  * framebuffer anyway.
 348  */
 349 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 350                                     struct drm_fb_helper_crtc **crtcs,
 351                                     struct drm_display_mode **modes,
 352                                     struct drm_fb_offset *offsets,
 353                                     bool *enabled, int width, int height)
 354 {
 355         struct drm_device *dev = fb_helper->dev;
 356         int i, j;
 357         bool *save_enabled;
 358         bool fallback = true;
 359         int num_connectors_enabled = 0;
 360         int num_connectors_detected = 0;
 361         uint64_t conn_configured = 0, mask;
 362         int pass = 0;
 363
 364         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
 365                                GFP_KERNEL);
 366         if (!save_enabled)
 367                 return false;
 368
 369         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
 370         mask = (1 << fb_helper->connector_count) - 1;
 371 retry:
 372         for (i = 0; i < fb_helper->connector_count; i++) {
 373                 struct drm_fb_helper_connector *fb_conn;
 374                 struct drm_connector *connector;
 375                 struct drm_encoder *encoder;
 376                 struct drm_fb_helper_crtc *new_crtc;
 377
 378                 fb_conn = fb_helper->connector_info[i];
 379                 connector = fb_conn->connector;
 380
 381                 if (conn_configured & (1 << i))
 382                         continue;
 383
 384                 if (pass == 0 && !connector->has_tile)
 385                         continue;
 386
 387                 if (connector->status == connector_status_connected)
 388                         num_connectors_detected++;
 389
 390                 if (!enabled[i]) {
 391                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 392                                       connector->name);
 393                         conn_configured |= (1 << i);
 394                         continue;
 395                 }
 396
 397                 if (connector->force == DRM_FORCE_OFF) {
 398                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 399                                       connector->name);
 400                         enabled[i] = false;
 401                         continue;
 402                 }
 403
 404                 encoder = connector->encoder;
 405                 if (!encoder || WARN_ON(!encoder->crtc)) {
 406                         if (connector->force > DRM_FORCE_OFF)
 407                                 goto bail;
 408
 409                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 410                                       connector->name);
 411                         enabled[i] = false;
 412                         conn_configured |= (1 << i);
 413                         continue;
 414                 }
 415
 416                 num_connectors_enabled++;
 417
 418                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
 419
 420                 /*
 421                  * Make sure we're not trying to drive multiple connectors
 422                  * with a single CRTC, since our cloning support may not
 423                  * match the BIOS.
 424                  */
 425                 for (j = 0; j < fb_helper->connector_count; j++) {
 426                         if (crtcs[j] == new_crtc) {
 427                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 428                                 goto bail;
 429                         }
 430                 }
 431
 432                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 433                               connector->name);
 434
 435                 /* go for command line mode first */
 436                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 437
 438                 /* try for preferred next */
 439                 if (!modes[i]) {
 440                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 441                                       connector->name, connector->has_tile);
 442                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 443                                                           height);
 444                 }
 445
 446                 /* No preferred mode marked by the EDID? Are there any modes? */
 447                 if (!modes[i] && !list_empty(&connector->modes)) {
 448                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 449                                       connector->name);
 450                         modes[i] = list_first_entry(&connector->modes,
 451                                                     struct drm_display_mode,
 452                                                     head);
 453                 }
 454
 455                 /* last resort: use current mode */
 456                 if (!modes[i]) {
 457                         /*
 458                          * IMPORTANT: We want to use the adjusted mode (i.e.
 459                          * after the panel fitter upscaling) as the initial
 460                          * config, not the input mode, which is what crtc->mode
 461                          * usually contains. But since our current fastboot
 462                          * code puts a mode derived from the post-pfit timings
 463                          * into crtc->mode this works out correctly. We don't
 464                          * use hwmode anywhere right now, so use it for this
 465                          * since the fb helper layer wants a pointer to
 466                          * something we own.
 467                          */
 468                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 469                                       connector->name);
 470                         intel_mode_from_pipe_config(&encoder->crtc->hwmode,
 471                                                     to_intel_crtc(encoder->crtc)->config);
 472                         modes[i] = &encoder->crtc->hwmode;
 473                 }
 474                 crtcs[i] = new_crtc;
 475
 476                 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
 477                               connector->name,
 478                               pipe_name(to_intel_crtc(encoder->crtc)->pipe),
 479                               encoder->crtc->base.id,
 480                               modes[i]->hdisplay, modes[i]->vdisplay,
 481                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 482
 483                 fallback = false;
 484                 conn_configured |= (1 << i);
 485         }
 486
 487         if ((conn_configured & mask) != mask) {
 488                 pass++;
 489                 goto retry;
 490         }
 491
 492         /*
 493          * If the BIOS didn't enable everything it could, fall back to have the
 494          * same user experiencing of lighting up as much as possible like the
 495          * fbdev helper library.
 496          */
 497         if (num_connectors_enabled != num_connectors_detected &&
 498             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 499                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 500                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 501                               num_connectors_detected);
 502                 fallback = true;
 503         }
 504
 505         if (fallback) {
 506 bail:
 507                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 508                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
 509                 kfree(save_enabled);
 510                 return false;
 511         }
 512
 513         kfree(save_enabled);
 514         return true;
 515 }
 516
 517 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 518         .initial_config = intel_fb_initial_config,
 519         .gamma_set = intel_crtc_fb_gamma_set,
 520         .gamma_get = intel_crtc_fb_gamma_get,
 521         .fb_probe = intelfb_create,
 522 };
 523
 524 static void intel_fbdev_destroy(struct drm_device *dev,
 525                                 struct intel_fbdev *ifbdev)
 526 {
 527         if (ifbdev->helper.fbdev) {
 528                 struct fb_info *info = ifbdev->helper.fbdev;
 529
 530                 unregister_framebuffer(info);
 531                 iounmap(info->screen_base);
 532                 if (info->cmap.len)
 533                         fb_dealloc_cmap(&info->cmap);
 534
 535                 framebuffer_release(info);
 536         }
 537
 538         drm_fb_helper_fini(&ifbdev->helper);
 539
 540         drm_framebuffer_unregister_private(&ifbdev->fb->base);
 541         drm_framebuffer_remove(&ifbdev->fb->base);
 542 }
 543
 544 /*
 545  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 546  * The core display code will have read out the current plane configuration,
 547  * so we use that to figure out if there's an object for us to use as the
 548  * fb, and if so, we re-use it for the fbdev configuration.
 549  *
 550  * Note we only support a single fb shared across pipes for boot (mostly for
 551  * fbcon), so we just find the biggest and use that.
 552  */
 553 static bool intel_fbdev_init_bios(struct drm_device *dev,
 554                                  struct intel_fbdev *ifbdev)
 555 {
 556         struct intel_framebuffer *fb = NULL;
 557         struct drm_crtc *crtc;
 558         struct intel_crtc *intel_crtc;
 559         struct intel_initial_plane_config *plane_config = NULL;
 560         unsigned int max_size = 0;
 561
 562         if (!i915.fastboot)
 563                 return false;
 564
 565         /* Find the largest fb */
 566         for_each_crtc(dev, crtc) {
 567                 intel_crtc = to_intel_crtc(crtc);
 568
 569                 if (!intel_crtc->active || !crtc->primary->fb) {
 570                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 571                                       pipe_name(intel_crtc->pipe));
 572                         continue;
 573                 }
 574
 575                 if (intel_crtc->plane_config.size > max_size) {
 576                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 577                                       pipe_name(intel_crtc->pipe));
 578                         plane_config = &intel_crtc->plane_config;
 579                         fb = to_intel_framebuffer(crtc->primary->fb);
 580                         max_size = plane_config->size;
 581                 }
 582         }
 583
 584         if (!fb) {
 585                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 586                 goto out;
 587         }
 588
 589         /* Now make sure all the pipes will fit into it */
 590         for_each_crtc(dev, crtc) {
 591                 unsigned int cur_size;
 592
 593                 intel_crtc = to_intel_crtc(crtc);
 594
 595                 if (!intel_crtc->active) {
 596                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 597                                       pipe_name(intel_crtc->pipe));
 598                         continue;
 599                 }
 600
 601                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 602                               pipe_name(intel_crtc->pipe));
 603
 604                 /*
 605                  * See if the plane fb we found above will fit on this
 606                  * pipe.  Note we need to use the selected fb's pitch and bpp
 607                  * rather than the current pipe's, since they differ.
 608                  */
 609                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 610                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 611                 if (fb->base.pitches[0] < cur_size) {
 612                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 613                                       pipe_name(intel_crtc->pipe),
 614                                       cur_size, fb->base.pitches[0]);
 615                         plane_config = NULL;
 616                         fb = NULL;
 617                         break;
 618                 }
 619
 620                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 621                 cur_size = intel_fb_align_height(dev, cur_size,
 622                                                  fb->base.pixel_format,
 623                                                  fb->base.modifier[0]);
 624                 cur_size *= fb->base.pitches[0];
 625                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 626                               pipe_name(intel_crtc->pipe),
 627                               intel_crtc->config->base.adjusted_mode.crtc_hdisplay,
 628                               intel_crtc->config->base.adjusted_mode.crtc_vdisplay,
 629                               fb->base.bits_per_pixel,
 630                               cur_size);
 631
 632                 if (cur_size > max_size) {
 633                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 634                                       pipe_name(intel_crtc->pipe),
 635                                       cur_size, max_size);
 636                         plane_config = NULL;
 637                         fb = NULL;
 638                         break;
 639                 }
 640
 641                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 642                               pipe_name(intel_crtc->pipe),
 643                               max_size, cur_size);
 644         }
 645
 646         if (!fb) {
 647                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 648                 goto out;
 649         }
 650
 651         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 652         ifbdev->fb = fb;
 653
 654         drm_framebuffer_reference(&ifbdev->fb->base);
 655
 656         /* Final pass to check if any active pipes don't have fbs */
 657         for_each_crtc(dev, crtc) {
 658                 intel_crtc = to_intel_crtc(crtc);
 659
 660                 if (!intel_crtc->active)
 661                         continue;
 662
 663                 WARN(!crtc->primary->fb,
 664                      "re-used BIOS config but lost an fb on crtc %d\n",
 665                      crtc->base.id);
 666         }
 667
 668
 669         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 670         return true;
 671
 672 out:
 673
 674         return false;
 675 }
 676
 677 static void intel_fbdev_suspend_worker(struct work_struct *work)
 678 {
 679         intel_fbdev_set_suspend(container_of(work,
 680                                              struct drm_i915_private,
 681                                              fbdev_suspend_work)->dev,
 682                                 FBINFO_STATE_RUNNING,
 683                                 true);
 684 }
 685
 686 int intel_fbdev_init(struct drm_device *dev)
 687 {
 688         struct intel_fbdev *ifbdev;
 689         struct drm_i915_private *dev_priv = dev->dev_private;
 690         int ret;
 691
 692         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 693                 return -ENODEV;
 694
 695         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 696         if (ifbdev == NULL)
 697                 return -ENOMEM;
 698
 699         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 700
 701         if (!intel_fbdev_init_bios(dev, ifbdev))
 702                 ifbdev->preferred_bpp = 32;
 703
 704         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 705                                  INTEL_INFO(dev)->num_pipes, 4);
 706         if (ret) {
 707                 kfree(ifbdev);
 708                 return ret;
 709         }
 710
 711         dev_priv->fbdev = ifbdev;
 712         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 713
 714         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 715
 716         return 0;
 717 }
 718
 719 void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 720 {
 721         struct drm_i915_private *dev_priv = data;
 722         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 723
 724         /* Due to peculiar init order wrt to hpd handling this is separate. */
 725         drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp);
 726 }
 727
 728 void intel_fbdev_fini(struct drm_device *dev)
 729 {
 730         struct drm_i915_private *dev_priv = dev->dev_private;
 731         if (!dev_priv->fbdev)
 732                 return;
 733
 734         flush_work(&dev_priv->fbdev_suspend_work);
 735
 736         async_synchronize_full();
 737         intel_fbdev_destroy(dev, dev_priv->fbdev);
 738         kfree(dev_priv->fbdev);
 739         dev_priv->fbdev = NULL;
 740 }
 741
 742 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 743 {
 744         struct drm_i915_private *dev_priv = dev->dev_private;
 745         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 746         struct fb_info *info;
 747
 748         if (!ifbdev)
 749                 return;
 750
 751         info = ifbdev->helper.fbdev;
 752
 753         if (synchronous) {
 754                 /* Flush any pending work to turn the console on, and then
 755                  * wait to turn it off. It must be synchronous as we are
 756                  * about to suspend or unload the driver.
 757                  *
 758                  * Note that from within the work-handler, we cannot flush
 759                  * ourselves, so only flush outstanding work upon suspend!
 760                  */
 761                 if (state != FBINFO_STATE_RUNNING)
 762                         flush_work(&dev_priv->fbdev_suspend_work);
 763                 console_lock();
 764         } else {
 765                 /*
 766                  * The console lock can be pretty contented on resume due
 767                  * to all the printk activity.  Try to keep it out of the hot
 768                  * path of resume if possible.
 769                  */
 770                 WARN_ON(state != FBINFO_STATE_RUNNING);
 771                 if (!console_trylock()) {
 772                         /* Don't block our own workqueue as this can
 773                          * be run in parallel with other i915.ko tasks.
 774                          */
 775                         schedule_work(&dev_priv->fbdev_suspend_work);
 776                         return;
 777                 }
 778         }
 779
 780         /* On resume from hibernation: If the object is shmemfs backed, it has
 781          * been restored from swap. If the object is stolen however, it will be
 782          * full of whatever garbage was left in there.
 783          */
 784         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 785                 memset_io(info->screen_base, 0, info->screen_size);
 786
 787         fb_set_suspend(info, state);
 788         console_unlock();
 789 }
 790
 791 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 792 {
 793         struct drm_i915_private *dev_priv = dev->dev_private;
 794         if (dev_priv->fbdev)
 795                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 796 }
 797
 798 void intel_fbdev_restore_mode(struct drm_device *dev)
 799 {
 800         int ret;
 801         struct drm_i915_private *dev_priv = dev->dev_private;
 802
 803         if (!dev_priv->fbdev)
 804                 return;
 805
 806         ret = drm_fb_helper_restore_fbdev_mode_unlocked(&dev_priv->fbdev->helper);
 807         if (ret)
 808                 DRM_DEBUG("failed to restore crtc mode\n");
 809 }