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