sys/dev/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 <drm/drmP.h>
  28 #include <linux/async.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/errno.h>
  32 #include <linux/string.h>
  33 #include <linux/mm.h>
  34 #include <linux/delay.h>
  35 #include <linux/fb.h>
  36
  37 #include <drm/drmP.h>
  38 #include <drm/drm_crtc.h>
  39 #include <drm/drm_fb_helper.h>
  40 #include "intel_drv.h"
  41 #include <drm/i915_drm.h>
  42 #include "i915_drv.h"
  43
  44 #if 0
  45 static int intel_fbdev_set_par(struct fb_info *info)
  46 {
  47         struct drm_fb_helper *fb_helper = info->par;
  48         struct intel_fbdev *ifbdev =
  49                 container_of(fb_helper, struct intel_fbdev, helper);
  50         int ret;
  51
  52         ret = drm_fb_helper_set_par(info);
  53
  54         if (ret == 0) {
  55                 /*
  56                  * FIXME: fbdev presumes that all callbacks also work from
  57                  * atomic contexts and relies on that for emergency oops
  58                  * printing. KMS totally doesn't do that and the locking here is
  59                  * by far not the only place this goes wrong.  Ignore this for
  60                  * now until we solve this for real.
  61                  */
  62                 mutex_lock(&fb_helper->dev->struct_mutex);
  63                 ret = i915_gem_object_set_to_gtt_domain(ifbdev->fb->obj,
  64                                                         true);
  65                 mutex_unlock(&fb_helper->dev->struct_mutex);
  66         }
  67
  68         return ret;
  69 }
  70
  71 static int intel_fbdev_blank(int blank, struct fb_info *info)
  72 {
  73         struct drm_fb_helper *fb_helper = info->par;
  74         struct intel_fbdev *ifbdev =
  75                 container_of(fb_helper, struct intel_fbdev, helper);
  76         int ret;
  77
  78         ret = drm_fb_helper_blank(blank, info);
  79
  80         if (ret == 0) {
  81                 /*
  82                  * FIXME: fbdev presumes that all callbacks also work from
  83                  * atomic contexts and relies on that for emergency oops
  84                  * printing. KMS totally doesn't do that and the locking here is
  85                  * by far not the only place this goes wrong.  Ignore this for
  86                  * now until we solve this for real.
  87                  */
  88                 mutex_lock(&fb_helper->dev->struct_mutex);
  89                 intel_fb_obj_invalidate(ifbdev->fb->obj, NULL, ORIGIN_GTT);
  90                 mutex_unlock(&fb_helper->dev->struct_mutex);
  91         }
  92
  93         return ret;
  94 }
  95
  96 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  97                                    struct fb_info *info)
  98 {
  99         struct drm_fb_helper *fb_helper = info->par;
 100         struct intel_fbdev *ifbdev =
 101                 container_of(fb_helper, struct intel_fbdev, helper);
 102
 103         int ret;
 104         ret = drm_fb_helper_pan_display(var, info);
 105
 106         if (ret == 0) {
 107                 /*
 108                  * FIXME: fbdev presumes that all callbacks also work from
 109                  * atomic contexts and relies on that for emergency oops
 110                  * printing. KMS totally doesn't do that and the locking here is
 111                  * by far not the only place this goes wrong.  Ignore this for
 112                  * now until we solve this for real.
 113                  */
 114                 mutex_lock(&fb_helper->dev->struct_mutex);
 115                 intel_fb_obj_invalidate(ifbdev->fb->obj, NULL, ORIGIN_GTT);
 116                 mutex_unlock(&fb_helper->dev->struct_mutex);
 117         }
 118
 119         return ret;
 120 }
 121
 122 static struct fb_ops intelfb_ops = {
 123         .owner = THIS_MODULE,
 124         .fb_check_var = drm_fb_helper_check_var,
 125         .fb_set_par = intel_fbdev_set_par,
 126         .fb_fillrect = cfb_fillrect,
 127         .fb_copyarea = cfb_copyarea,
 128         .fb_imageblit = cfb_imageblit,
 129         .fb_pan_display = intel_fbdev_pan_display,
 130         .fb_blank = intel_fbdev_blank,
 131         .fb_setcmap = drm_fb_helper_setcmap,
 132         .fb_debug_enter = drm_fb_helper_debug_enter,
 133         .fb_debug_leave = drm_fb_helper_debug_leave,
 134 };
 135 #endif
 136
 137 static int intelfb_alloc(struct drm_fb_helper *helper,
 138                          struct drm_fb_helper_surface_size *sizes)
 139 {
 140         struct intel_fbdev *ifbdev =
 141                 container_of(helper, struct intel_fbdev, helper);
 142         struct drm_framebuffer *fb;
 143         struct drm_device *dev = helper->dev;
 144         struct drm_mode_fb_cmd2 mode_cmd = {};
 145         struct drm_i915_gem_object *obj;
 146         int size, ret;
 147
 148         /* we don't do packed 24bpp */
 149         if (sizes->surface_bpp == 24)
 150                 sizes->surface_bpp = 32;
 151
 152         mode_cmd.width = sizes->surface_width;
 153         mode_cmd.height = sizes->surface_height;
 154
 155         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 156                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 157         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 158                                                           sizes->surface_depth);
 159
 160         size = mode_cmd.pitches[0] * mode_cmd.height;
 161         size = PAGE_ALIGN(size);
 162         obj = i915_gem_object_create_stolen(dev, size);
 163         if (obj == NULL)
 164                 obj = i915_gem_alloc_object(dev, size);
 165         if (!obj) {
 166                 DRM_ERROR("failed to allocate framebuffer\n");
 167                 ret = -ENOMEM;
 168                 goto out;
 169         }
 170
 171         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 172         if (IS_ERR(fb)) {
 173                 ret = PTR_ERR(fb);
 174                 goto out_unref;
 175         }
 176
 177         /* Flush everything out, we'll be doing GTT only from now on */
 178         ret = intel_pin_and_fence_fb_obj(NULL, fb, NULL, NULL);
 179         if (ret) {
 180                 DRM_ERROR("failed to pin obj: %d\n", ret);
 181                 goto out_fb;
 182         }
 183
 184         ifbdev->fb = to_intel_framebuffer(fb);
 185
 186         return 0;
 187
 188 out_fb:
 189         drm_framebuffer_remove(fb);
 190 out_unref:
 191         drm_gem_object_unreference(&obj->base);
 192 out:
 193         return ret;
 194 }
 195
 196 static int intelfb_create(struct drm_fb_helper *helper,
 197                           struct drm_fb_helper_surface_size *sizes)
 198 {
 199         struct intel_fbdev *ifbdev =
 200                 container_of(helper, struct intel_fbdev, helper);
 201         struct intel_framebuffer *intel_fb = ifbdev->fb;
 202         struct drm_device *dev = helper->dev;
 203         struct drm_i915_private *dev_priv = dev->dev_private;
 204         struct fb_info *info;
 205         struct drm_framebuffer *fb;
 206         struct drm_i915_gem_object *obj;
 207         device_t vga_dev;
 208         int size, ret;
 209         bool prealloc = false;
 210
 211         mutex_lock(&dev->struct_mutex);
 212
 213         if (intel_fb &&
 214             (sizes->fb_width > intel_fb->base.width ||
 215              sizes->fb_height > intel_fb->base.height)) {
 216                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 217                               " releasing it\n",
 218                               intel_fb->base.width, intel_fb->base.height,
 219                               sizes->fb_width, sizes->fb_height);
 220                 drm_framebuffer_unreference(&intel_fb->base);
 221                 intel_fb = ifbdev->fb = NULL;
 222         }
 223         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 224                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 225                 ret = intelfb_alloc(helper, sizes);
 226                 if (ret)
 227                         goto out_unlock;
 228                 intel_fb = ifbdev->fb;
 229         } else {
 230                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 231                 prealloc = true;
 232                 sizes->fb_width = intel_fb->base.width;
 233                 sizes->fb_height = intel_fb->base.height;
 234         }
 235
 236         obj = intel_fb->obj;
 237         size = obj->base.size;
 238
 239 #if 0
 240         info = framebuffer_alloc(0, &dev->pdev->dev);
 241 #else
 242         info = kmalloc(sizeof(struct fb_info), M_DRM, M_WAITOK | M_ZERO);
 243 #endif
 244         if (!info) {
 245                 ret = -ENOMEM;
 246                 goto out_unpin;
 247         }
 248
 249 #if 0
 250         info->par = helper;
 251 #endif
 252
 253         fb = &ifbdev->fb->base;
 254
 255 #ifdef __DragonFly__
 256         vga_dev = device_get_parent(dev->dev);
 257         info->width = sizes->fb_width;
 258         info->height = sizes->fb_height;
 259         info->stride = fb->pitches[0];
 260         info->depth = sizes->surface_bpp;
 261         info->paddr = dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj);
 262         info->is_vga_boot_display = vga_pci_is_boot_display(vga_dev);
 263         info->vaddr =
 264             (vm_offset_t)pmap_mapdev_attr(info->paddr,
 265                 sizes->surface_height * info->stride,
 266                 VM_MEMATTR_WRITE_COMBINING);
 267 #endif
 268
 269         ifbdev->helper.fb = fb;
 270         ifbdev->helper.fbdev = info;
 271
 272 #if 0
 273         strcpy(info->fix.id, "inteldrmfb");
 274
 275         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 276         info->fbops = &intelfb_ops;
 277
 278         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 279         if (ret) {
 280                 ret = -ENOMEM;
 281                 goto out_unpin;
 282         }
 283         /* setup aperture base/size for vesafb takeover */
 284         info->apertures = alloc_apertures(1);
 285         if (!info->apertures) {
 286                 ret = -ENOMEM;
 287                 goto out_unpin;
 288         }
 289         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 290         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 291
 292         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 293         info->fix.smem_len = size;
 294
 295         info->screen_base =
 296                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 297                            size);
 298         if (!info->screen_base) {
 299                 ret = -ENOSPC;
 300                 goto out_unpin;
 301         }
 302         info->screen_size = size;
 303
 304         /* This driver doesn't need a VT switch to restore the mode on resume */
 305         info->skip_vt_switch = true;
 306
 307         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 308         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 309
 310         /* If the object is shmemfs backed, it will have given us zeroed pages.
 311          * If the object is stolen however, it will be full of whatever
 312          * garbage was left in there.
 313          */
 314         if (ifbdev->fb->obj->stolen && !prealloc)
 315                 memset_io(info->screen_base, 0, info->screen_size);
 316
 317         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 318 #endif
 319
 320         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
 321                       fb->width, fb->height,
 322                       i915_gem_obj_ggtt_offset(obj), obj);
 323
 324         mutex_unlock(&dev->struct_mutex);
 325 #if 0
 326         vga_switcheroo_client_fb_set(dev->pdev, info);
 327 #endif
 328         return 0;
 329
 330 out_unpin:
 331         i915_gem_object_ggtt_unpin(obj);
 332         drm_gem_object_unreference(&obj->base);
 333 out_unlock:
 334         mutex_unlock(&dev->struct_mutex);
 335         return ret;
 336 }
 337
 338 /** Sets the color ramps on behalf of RandR */
 339 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 340                                     u16 blue, int regno)
 341 {
 342         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 343
 344         intel_crtc->lut_r[regno] = red >> 8;
 345         intel_crtc->lut_g[regno] = green >> 8;
 346         intel_crtc->lut_b[regno] = blue >> 8;
 347 }
 348
 349 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 350                                     u16 *blue, int regno)
 351 {
 352         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 353
 354         *red = intel_crtc->lut_r[regno] << 8;
 355         *green = intel_crtc->lut_g[regno] << 8;
 356         *blue = intel_crtc->lut_b[regno] << 8;
 357 }
 358
 359 static struct drm_fb_helper_crtc *
 360 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 361 {
 362         int i;
 363
 364         for (i = 0; i < fb_helper->crtc_count; i++)
 365                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 366                         return &fb_helper->crtc_info[i];
 367
 368         return NULL;
 369 }
 370
 371 /*
 372  * Try to read the BIOS display configuration and use it for the initial
 373  * fb configuration.
 374  *
 375  * The BIOS or boot loader will generally create an initial display
 376  * configuration for us that includes some set of active pipes and displays.
 377  * This routine tries to figure out which pipes and connectors are active
 378  * and stuffs them into the crtcs and modes array given to us by the
 379  * drm_fb_helper code.
 380  *
 381  * The overall sequence is:
 382  *   intel_fbdev_init - from driver load
 383  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 384  *     drm_fb_helper_init - build fb helper structs
 385  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 386  *   intel_fbdev_initial_config - apply the config
 387  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 388  *         drm_setup_crtcs - build crtc config for fbdev
 389  *           intel_fb_initial_config - find active connectors etc
 390  *         drm_fb_helper_single_fb_probe - set up fbdev
 391  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 392  *
 393  * Note that we don't make special consideration whether we could actually
 394  * switch to the selected modes without a full modeset. E.g. when the display
 395  * is in VGA mode we need to recalculate watermarks and set a new high-res
 396  * framebuffer anyway.
 397  */
 398 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 399                                     struct drm_fb_helper_crtc **crtcs,
 400                                     struct drm_display_mode **modes,
 401                                     struct drm_fb_offset *offsets,
 402                                     bool *enabled, int width, int height)
 403 {
 404         struct drm_device *dev = fb_helper->dev;
 405         int i, j;
 406         bool *save_enabled;
 407         bool fallback = true;
 408         int num_connectors_enabled = 0;
 409         int num_connectors_detected = 0;
 410         uint64_t conn_configured = 0, mask;
 411         int pass = 0;
 412
 413         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
 414                                GFP_KERNEL);
 415         if (!save_enabled)
 416                 return false;
 417
 418         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
 419         mask = (1 << fb_helper->connector_count) - 1;
 420 retry:
 421         for (i = 0; i < fb_helper->connector_count; i++) {
 422                 struct drm_fb_helper_connector *fb_conn;
 423                 struct drm_connector *connector;
 424                 struct drm_encoder *encoder;
 425                 struct drm_fb_helper_crtc *new_crtc;
 426
 427                 fb_conn = fb_helper->connector_info[i];
 428                 connector = fb_conn->connector;
 429
 430                 if (conn_configured & (1 << i))
 431                         continue;
 432
 433                 if (pass == 0 && !connector->has_tile)
 434                         continue;
 435
 436                 if (connector->status == connector_status_connected)
 437                         num_connectors_detected++;
 438
 439                 if (!enabled[i]) {
 440                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 441                                       connector->name);
 442                         conn_configured |= (1 << i);
 443                         continue;
 444                 }
 445
 446                 if (connector->force == DRM_FORCE_OFF) {
 447                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 448                                       connector->name);
 449                         enabled[i] = false;
 450                         continue;
 451                 }
 452
 453                 encoder = connector->encoder;
 454                 if (!encoder || WARN_ON(!encoder->crtc)) {
 455                         if (connector->force > DRM_FORCE_OFF)
 456                                 goto bail;
 457
 458                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 459                                       connector->name);
 460                         enabled[i] = false;
 461                         conn_configured |= (1 << i);
 462                         continue;
 463                 }
 464
 465                 num_connectors_enabled++;
 466
 467                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
 468
 469                 /*
 470                  * Make sure we're not trying to drive multiple connectors
 471                  * with a single CRTC, since our cloning support may not
 472                  * match the BIOS.
 473                  */
 474                 for (j = 0; j < fb_helper->connector_count; j++) {
 475                         if (crtcs[j] == new_crtc) {
 476                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 477                                 goto bail;
 478                         }
 479                 }
 480
 481                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 482                               connector->name);
 483
 484                 /* go for command line mode first */
 485                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 486
 487                 /* try for preferred next */
 488                 if (!modes[i]) {
 489                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 490                                       connector->name, connector->has_tile);
 491                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 492                                                           height);
 493                 }
 494
 495                 /* No preferred mode marked by the EDID? Are there any modes? */
 496                 if (!modes[i] && !list_empty(&connector->modes)) {
 497                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 498                                       connector->name);
 499                         modes[i] = list_first_entry(&connector->modes,
 500                                                     struct drm_display_mode,
 501                                                     head);
 502                 }
 503
 504                 /* last resort: use current mode */
 505                 if (!modes[i]) {
 506                         /*
 507                          * IMPORTANT: We want to use the adjusted mode (i.e.
 508                          * after the panel fitter upscaling) as the initial
 509                          * config, not the input mode, which is what crtc->mode
 510                          * usually contains. But since our current fastboot
 511                          * code puts a mode derived from the post-pfit timings
 512                          * into crtc->mode this works out correctly. We don't
 513                          * use hwmode anywhere right now, so use it for this
 514                          * since the fb helper layer wants a pointer to
 515                          * something we own.
 516                          */
 517                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 518                                       connector->name);
 519                         intel_mode_from_pipe_config(&encoder->crtc->hwmode,
 520                                                     to_intel_crtc(encoder->crtc)->config);
 521                         modes[i] = &encoder->crtc->hwmode;
 522                 }
 523                 crtcs[i] = new_crtc;
 524
 525                 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
 526                               connector->name,
 527                               pipe_name(to_intel_crtc(encoder->crtc)->pipe),
 528                               encoder->crtc->base.id,
 529                               modes[i]->hdisplay, modes[i]->vdisplay,
 530                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 531
 532                 fallback = false;
 533                 conn_configured |= (1 << i);
 534         }
 535
 536         if ((conn_configured & mask) != mask) {
 537                 pass++;
 538                 goto retry;
 539         }
 540
 541         /*
 542          * If the BIOS didn't enable everything it could, fall back to have the
 543          * same user experiencing of lighting up as much as possible like the
 544          * fbdev helper library.
 545          */
 546         if (num_connectors_enabled != num_connectors_detected &&
 547             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 548                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 549                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 550                               num_connectors_detected);
 551                 fallback = true;
 552         }
 553
 554         if (fallback) {
 555 bail:
 556                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 557                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
 558                 kfree(save_enabled);
 559                 return false;
 560         }
 561
 562         kfree(save_enabled);
 563         return true;
 564 }
 565
 566 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 567         .initial_config = intel_fb_initial_config,
 568         .gamma_set = intel_crtc_fb_gamma_set,
 569         .gamma_get = intel_crtc_fb_gamma_get,
 570         .fb_probe = intelfb_create,
 571 };
 572
 573 static void intel_fbdev_destroy(struct drm_device *dev,
 574                                 struct intel_fbdev *ifbdev)
 575 {
 576 #if 0
 577         if (ifbdev->helper.fbdev) {
 578                 struct fb_info *info = ifbdev->helper.fbdev;
 579
 580                 unregister_framebuffer(info);
 581                 iounmap(info->screen_base);
 582                 if (info->cmap.len)
 583                         fb_dealloc_cmap(&info->cmap);
 584
 585                 framebuffer_release(info);
 586         }
 587 #endif
 588
 589         drm_fb_helper_fini(&ifbdev->helper);
 590
 591         drm_framebuffer_unregister_private(&ifbdev->fb->base);
 592         drm_framebuffer_remove(&ifbdev->fb->base);
 593 }
 594
 595 /*
 596  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 597  * The core display code will have read out the current plane configuration,
 598  * so we use that to figure out if there's an object for us to use as the
 599  * fb, and if so, we re-use it for the fbdev configuration.
 600  *
 601  * Note we only support a single fb shared across pipes for boot (mostly for
 602  * fbcon), so we just find the biggest and use that.
 603  */
 604 static bool intel_fbdev_init_bios(struct drm_device *dev,
 605                                  struct intel_fbdev *ifbdev)
 606 {
 607         struct intel_framebuffer *fb = NULL;
 608         struct drm_crtc *crtc;
 609         struct intel_crtc *intel_crtc;
 610         struct intel_initial_plane_config *plane_config = NULL;
 611         unsigned int max_size = 0;
 612
 613         if (!i915.fastboot)
 614                 return false;
 615
 616         /* Find the largest fb */
 617         for_each_crtc(dev, crtc) {
 618                 intel_crtc = to_intel_crtc(crtc);
 619
 620                 if (!intel_crtc->active || !crtc->primary->fb) {
 621                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 622                                       pipe_name(intel_crtc->pipe));
 623                         continue;
 624                 }
 625
 626                 if (intel_crtc->plane_config.size > max_size) {
 627                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 628                                       pipe_name(intel_crtc->pipe));
 629                         plane_config = &intel_crtc->plane_config;
 630                         fb = to_intel_framebuffer(crtc->primary->fb);
 631                         max_size = plane_config->size;
 632                 }
 633         }
 634
 635         if (!fb) {
 636                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 637                 goto out;
 638         }
 639
 640         /* Now make sure all the pipes will fit into it */
 641         for_each_crtc(dev, crtc) {
 642                 unsigned int cur_size;
 643
 644                 intel_crtc = to_intel_crtc(crtc);
 645
 646                 if (!intel_crtc->active) {
 647                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 648                                       pipe_name(intel_crtc->pipe));
 649                         continue;
 650                 }
 651
 652                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 653                               pipe_name(intel_crtc->pipe));
 654
 655                 /*
 656                  * See if the plane fb we found above will fit on this
 657                  * pipe.  Note we need to use the selected fb's pitch and bpp
 658                  * rather than the current pipe's, since they differ.
 659                  */
 660                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 661                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 662                 if (fb->base.pitches[0] < cur_size) {
 663                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 664                                       pipe_name(intel_crtc->pipe),
 665                                       cur_size, fb->base.pitches[0]);
 666                         plane_config = NULL;
 667                         fb = NULL;
 668                         break;
 669                 }
 670
 671                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 672                 cur_size = intel_fb_align_height(dev, cur_size,
 673                                                  fb->base.pixel_format,
 674                                                  fb->base.modifier[0]);
 675                 cur_size *= fb->base.pitches[0];
 676                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 677                               pipe_name(intel_crtc->pipe),
 678                               intel_crtc->config->base.adjusted_mode.crtc_hdisplay,
 679                               intel_crtc->config->base.adjusted_mode.crtc_vdisplay,
 680                               fb->base.bits_per_pixel,
 681                               cur_size);
 682
 683                 if (cur_size > max_size) {
 684                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 685                                       pipe_name(intel_crtc->pipe),
 686                                       cur_size, max_size);
 687                         plane_config = NULL;
 688                         fb = NULL;
 689                         break;
 690                 }
 691
 692                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 693                               pipe_name(intel_crtc->pipe),
 694                               max_size, cur_size);
 695         }
 696
 697         if (!fb) {
 698                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 699                 goto out;
 700         }
 701
 702         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 703         ifbdev->fb = fb;
 704
 705         drm_framebuffer_reference(&ifbdev->fb->base);
 706
 707         /* Final pass to check if any active pipes don't have fbs */
 708         for_each_crtc(dev, crtc) {
 709                 intel_crtc = to_intel_crtc(crtc);
 710
 711                 if (!intel_crtc->active)
 712                         continue;
 713
 714                 WARN(!crtc->primary->fb,
 715                      "re-used BIOS config but lost an fb on crtc %d\n",
 716                      crtc->base.id);
 717         }
 718
 719
 720         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 721         return true;
 722
 723 out:
 724
 725         return false;
 726 }
 727
 728 static void intel_fbdev_suspend_worker(struct work_struct *work)
 729 {
 730         intel_fbdev_set_suspend(container_of(work,
 731                                              struct drm_i915_private,
 732                                              fbdev_suspend_work)->dev,
 733                                 FBINFO_STATE_RUNNING,
 734                                 true);
 735 }
 736
 737 int intel_fbdev_init(struct drm_device *dev)
 738 {
 739         struct intel_fbdev *ifbdev;
 740         struct drm_i915_private *dev_priv = dev->dev_private;
 741         int ret;
 742
 743         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 744                 return -ENODEV;
 745
 746         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 747         if (ifbdev == NULL)
 748                 return -ENOMEM;
 749
 750         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 751
 752         if (!intel_fbdev_init_bios(dev, ifbdev))
 753                 ifbdev->preferred_bpp = 32;
 754
 755         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 756                                  INTEL_INFO(dev)->num_pipes, 4);
 757         if (ret) {
 758                 kfree(ifbdev);
 759                 return ret;
 760         }
 761
 762         dev_priv->fbdev = ifbdev;
 763         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 764
 765         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 766
 767         return 0;
 768 }
 769
 770 void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 771 {
 772         struct drm_i915_private *dev_priv = data;
 773         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 774
 775         /* Due to peculiar init order wrt to hpd handling this is separate. */
 776         drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp);
 777 }
 778
 779 void intel_fbdev_fini(struct drm_device *dev)
 780 {
 781         struct drm_i915_private *dev_priv = dev->dev_private;
 782         if (!dev_priv->fbdev)
 783                 return;
 784
 785 #if 0
 786         flush_work(&dev_priv->fbdev_suspend_work);
 787 #endif
 788
 789         async_synchronize_full();
 790         intel_fbdev_destroy(dev, dev_priv->fbdev);
 791         kfree(dev_priv->fbdev);
 792         dev_priv->fbdev = NULL;
 793 }
 794
 795 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 796 {
 797 #if 0
 798         struct drm_i915_private *dev_priv = dev->dev_private;
 799         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 800         struct fb_info *info;
 801
 802         if (!ifbdev)
 803                 return;
 804
 805         info = ifbdev->helper.fbdev;
 806
 807         if (synchronous) {
 808                 /* Flush any pending work to turn the console on, and then
 809                  * wait to turn it off. It must be synchronous as we are
 810                  * about to suspend or unload the driver.
 811                  *
 812                  * Note that from within the work-handler, we cannot flush
 813                  * ourselves, so only flush outstanding work upon suspend!
 814                  */
 815                 if (state != FBINFO_STATE_RUNNING)
 816                         flush_work(&dev_priv->fbdev_suspend_work);
 817                 console_lock();
 818         } else {
 819                 /*
 820                  * The console lock can be pretty contented on resume due
 821                  * to all the printk activity.  Try to keep it out of the hot
 822                  * path of resume if possible.
 823                  */
 824                 WARN_ON(state != FBINFO_STATE_RUNNING);
 825                 if (!console_trylock()) {
 826                         /* Don't block our own workqueue as this can
 827                          * be run in parallel with other i915.ko tasks.
 828                          */
 829                         schedule_work(&dev_priv->fbdev_suspend_work);
 830                         return;
 831                 }
 832         }
 833
 834         /* On resume from hibernation: If the object is shmemfs backed, it has
 835          * been restored from swap. If the object is stolen however, it will be
 836          * full of whatever garbage was left in there.
 837          */
 838         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 839                 memset_io(info->screen_base, 0, info->screen_size);
 840
 841         fb_set_suspend(info, state);
 842         console_unlock();
 843 #endif
 844 }
 845
 846 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 847 {
 848         struct drm_i915_private *dev_priv = dev->dev_private;
 849         if (dev_priv->fbdev)
 850                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 851 }
 852
 853 void intel_fbdev_restore_mode(struct drm_device *dev)
 854 {
 855         int ret;
 856         struct drm_i915_private *dev_priv = dev->dev_private;
 857
 858         if (!dev_priv->fbdev)
 859                 return;
 860
 861         ret = drm_fb_helper_restore_fbdev_mode_unlocked(&dev_priv->fbdev->helper);
 862         if (ret)
 863                 DRM_DEBUG("failed to restore crtc mode\n");
 864 }