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 "intel_frontbuffer.h"
  45 #include <drm/i915_drm.h>
  46 #include "i915_drv.h"
  47
  48 static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
  49 {
  50         struct drm_i915_gem_object *obj = ifbdev->fb->obj;
  51         unsigned int origin = ifbdev->vma->fence ? ORIGIN_GTT : ORIGIN_CPU;
  52
  53         intel_fb_obj_invalidate(obj, origin);
  54 }
  55
  56 static int intel_fbdev_set_par(struct fb_info *info)
  57 {
  58         struct drm_fb_helper *fb_helper = info->par;
  59         struct intel_fbdev *ifbdev =
  60                 container_of(fb_helper, struct intel_fbdev, helper);
  61         int ret;
  62
  63         ret = drm_fb_helper_set_par(info);
  64         if (ret == 0)
  65                 intel_fbdev_invalidate(ifbdev);
  66
  67         return ret;
  68 }
  69
  70 static int intel_fbdev_blank(int blank, struct fb_info *info)
  71 {
  72         struct drm_fb_helper *fb_helper = info->par;
  73         struct intel_fbdev *ifbdev =
  74                 container_of(fb_helper, struct intel_fbdev, helper);
  75         int ret;
  76
  77         ret = drm_fb_helper_blank(blank, info);
  78         if (ret == 0)
  79                 intel_fbdev_invalidate(ifbdev);
  80
  81         return ret;
  82 }
  83
  84 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  85                                    struct fb_info *info)
  86 {
  87         struct drm_fb_helper *fb_helper = info->par;
  88         struct intel_fbdev *ifbdev =
  89                 container_of(fb_helper, struct intel_fbdev, helper);
  90         int ret;
  91
  92         ret = drm_fb_helper_pan_display(var, info);
  93         if (ret == 0)
  94                 intel_fbdev_invalidate(ifbdev);
  95
  96         return ret;
  97 }
  98
  99 static struct fb_ops intelfb_ops = {
 100         .owner = THIS_MODULE,
 101         DRM_FB_HELPER_DEFAULT_OPS,
 102         .fb_set_par = intel_fbdev_set_par,
 103         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 104         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 105         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 106         .fb_pan_display = intel_fbdev_pan_display,
 107         .fb_blank = intel_fbdev_blank,
 108 };
 109
 110 static int intelfb_alloc(struct drm_fb_helper *helper,
 111                          struct drm_fb_helper_surface_size *sizes)
 112 {
 113         struct intel_fbdev *ifbdev =
 114                 container_of(helper, struct intel_fbdev, helper);
 115         struct drm_framebuffer *fb;
 116         struct drm_device *dev = helper->dev;
 117         struct drm_i915_private *dev_priv = to_i915(dev);
 118         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 119         struct drm_mode_fb_cmd2 mode_cmd = {};
 120         struct drm_i915_gem_object *obj;
 121         int size, ret;
 122
 123         /* we don't do packed 24bpp */
 124         if (sizes->surface_bpp == 24)
 125                 sizes->surface_bpp = 32;
 126
 127         mode_cmd.width = sizes->surface_width;
 128         mode_cmd.height = sizes->surface_height;
 129
 130         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 131                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 132         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 133                                                           sizes->surface_depth);
 134
 135         size = mode_cmd.pitches[0] * mode_cmd.height;
 136         size = PAGE_ALIGN(size);
 137
 138         /* If the FB is too big, just don't use it since fbdev is not very
 139          * important and we should probably use that space with FBC or other
 140          * features. */
 141         obj = NULL;
 142         if (size * 2 < ggtt->stolen_usable_size)
 143                 obj = i915_gem_object_create_stolen(dev_priv, size);
 144         if (obj == NULL)
 145                 obj = i915_gem_object_create(dev_priv, size);
 146         if (IS_ERR(obj)) {
 147                 DRM_ERROR("failed to allocate framebuffer\n");
 148                 ret = PTR_ERR(obj);
 149                 goto err;
 150         }
 151
 152         fb = intel_framebuffer_create(obj, &mode_cmd);
 153         if (IS_ERR(fb)) {
 154                 ret = PTR_ERR(fb);
 155                 goto err_obj;
 156         }
 157
 158         ifbdev->fb = to_intel_framebuffer(fb);
 159
 160         return 0;
 161
 162 err_obj:
 163         i915_gem_object_put(obj);
 164 err:
 165         return ret;
 166 }
 167
 168 static int intelfb_create(struct drm_fb_helper *helper,
 169                           struct drm_fb_helper_surface_size *sizes)
 170 {
 171         struct intel_fbdev *ifbdev =
 172                 container_of(helper, struct intel_fbdev, helper);
 173         struct intel_framebuffer *intel_fb = ifbdev->fb;
 174         struct drm_device *dev = helper->dev;
 175         struct drm_i915_private *dev_priv = to_i915(dev);
 176         struct pci_dev *pdev = dev_priv->drm.pdev;
 177         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 178         struct fb_info *info;
 179         struct drm_framebuffer *fb;
 180         struct i915_vma *vma;
 181         bool prealloc = false;
 182         void __iomem *vaddr;
 183         int ret;
 184
 185         if (intel_fb &&
 186             (sizes->fb_width > intel_fb->base.width ||
 187              sizes->fb_height > intel_fb->base.height)) {
 188                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 189                               " releasing it\n",
 190                               intel_fb->base.width, intel_fb->base.height,
 191                               sizes->fb_width, sizes->fb_height);
 192                 drm_framebuffer_unreference(&intel_fb->base);
 193                 intel_fb = ifbdev->fb = NULL;
 194         }
 195         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 196                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 197                 ret = intelfb_alloc(helper, sizes);
 198                 if (ret)
 199                         return ret;
 200                 intel_fb = ifbdev->fb;
 201         } else {
 202                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 203                 prealloc = true;
 204                 sizes->fb_width = intel_fb->base.width;
 205                 sizes->fb_height = intel_fb->base.height;
 206         }
 207
 208         mutex_lock(&dev->struct_mutex);
 209
 210         /* Pin the GGTT vma for our access via info->screen_base.
 211          * This also validates that any existing fb inherited from the
 212          * BIOS is suitable for own access.
 213          */
 214         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, DRM_MODE_ROTATE_0);
 215         if (IS_ERR(vma)) {
 216                 ret = PTR_ERR(vma);
 217                 goto out_unlock;
 218         }
 219
 220         info = drm_fb_helper_alloc_fbi(helper);
 221         if (IS_ERR(info)) {
 222                 DRM_ERROR("Failed to allocate fb_info\n");
 223                 ret = PTR_ERR(info);
 224                 goto out_unpin;
 225         }
 226
 227         info->par = helper;
 228
 229         fb = &ifbdev->fb->base;
 230
 231         ifbdev->helper.fb = fb;
 232
 233         strcpy(info->fix.id, "inteldrmfb");
 234
 235         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 236         info->fbops = &intelfb_ops;
 237
 238         /* setup aperture base/size for vesafb takeover */
 239         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 240         info->apertures->ranges[0].size = ggtt->mappable_end;
 241
 242         info->fix.smem_start = dev->mode_config.fb_base + i915_ggtt_offset(vma);
 243         info->fix.smem_len = vma->node.size;
 244
 245         vaddr = i915_vma_pin_iomap(vma);
 246         if (IS_ERR(vaddr)) {
 247                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 248                 ret = PTR_ERR(vaddr);
 249                 goto out_unpin;
 250         }
 251         info->screen_base = vaddr;
 252         info->screen_size = vma->node.size;
 253
 254         /* This driver doesn't need a VT switch to restore the mode on resume */
 255         info->skip_vt_switch = true;
 256
 257         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 258         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 259
 260         /* If the object is shmemfs backed, it will have given us zeroed pages.
 261          * If the object is stolen however, it will be full of whatever
 262          * garbage was left in there.
 263          */
 264         if (intel_fb->obj->stolen && !prealloc)
 265                 memset_io(info->screen_base, 0, info->screen_size);
 266
 267         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 268
 269         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08x\n",
 270                       fb->width, fb->height, i915_ggtt_offset(vma));
 271         ifbdev->vma = vma;
 272
 273         mutex_unlock(&dev->struct_mutex);
 274         vga_switcheroo_client_fb_set(pdev, info);
 275         return 0;
 276
 277 out_unpin:
 278         intel_unpin_fb_vma(vma);
 279 out_unlock:
 280         mutex_unlock(&dev->struct_mutex);
 281         return ret;
 282 }
 283
 284 /** Sets the color ramps on behalf of RandR */
 285 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 286                                     u16 blue, int regno)
 287 {
 288         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 289
 290         intel_crtc->lut_r[regno] = red >> 8;
 291         intel_crtc->lut_g[regno] = green >> 8;
 292         intel_crtc->lut_b[regno] = blue >> 8;
 293 }
 294
 295 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 296                                     u16 *blue, int regno)
 297 {
 298         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 299
 300         *red = intel_crtc->lut_r[regno] << 8;
 301         *green = intel_crtc->lut_g[regno] << 8;
 302         *blue = intel_crtc->lut_b[regno] << 8;
 303 }
 304
 305 static struct drm_fb_helper_crtc *
 306 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 307 {
 308         int i;
 309
 310         for (i = 0; i < fb_helper->crtc_count; i++)
 311                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 312                         return &fb_helper->crtc_info[i];
 313
 314         return NULL;
 315 }
 316
 317 /*
 318  * Try to read the BIOS display configuration and use it for the initial
 319  * fb configuration.
 320  *
 321  * The BIOS or boot loader will generally create an initial display
 322  * configuration for us that includes some set of active pipes and displays.
 323  * This routine tries to figure out which pipes and connectors are active
 324  * and stuffs them into the crtcs and modes array given to us by the
 325  * drm_fb_helper code.
 326  *
 327  * The overall sequence is:
 328  *   intel_fbdev_init - from driver load
 329  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 330  *     drm_fb_helper_init - build fb helper structs
 331  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 332  *   intel_fbdev_initial_config - apply the config
 333  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 334  *         drm_setup_crtcs - build crtc config for fbdev
 335  *           intel_fb_initial_config - find active connectors etc
 336  *         drm_fb_helper_single_fb_probe - set up fbdev
 337  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 338  *
 339  * Note that we don't make special consideration whether we could actually
 340  * switch to the selected modes without a full modeset. E.g. when the display
 341  * is in VGA mode we need to recalculate watermarks and set a new high-res
 342  * framebuffer anyway.
 343  */
 344 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 345                                     struct drm_fb_helper_crtc **crtcs,
 346                                     struct drm_display_mode **modes,
 347                                     struct drm_fb_offset *offsets,
 348                                     bool *enabled, int width, int height)
 349 {
 350         struct drm_i915_private *dev_priv = to_i915(fb_helper->dev);
 351         unsigned long conn_configured, conn_seq, mask;
 352         unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
 353         int i, j;
 354         bool *save_enabled;
 355         bool fallback = true;
 356         int num_connectors_enabled = 0;
 357         int num_connectors_detected = 0;
 358
 359         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
 360         if (!save_enabled)
 361                 return false;
 362
 363         memcpy(save_enabled, enabled, count);
 364         mask = GENMASK(count - 1, 0);
 365         conn_configured = 0;
 366 retry:
 367         conn_seq = conn_configured;
 368         for (i = 0; i < count; i++) {
 369                 struct drm_fb_helper_connector *fb_conn;
 370                 struct drm_connector *connector;
 371                 struct drm_encoder *encoder;
 372                 struct drm_fb_helper_crtc *new_crtc;
 373                 struct intel_crtc *intel_crtc;
 374
 375                 fb_conn = fb_helper->connector_info[i];
 376                 connector = fb_conn->connector;
 377
 378                 if (conn_configured & BIT(i))
 379                         continue;
 380
 381                 if (conn_seq == 0 && !connector->has_tile)
 382                         continue;
 383
 384                 if (connector->status == connector_status_connected)
 385                         num_connectors_detected++;
 386
 387                 if (!enabled[i]) {
 388                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 389                                       connector->name);
 390                         conn_configured |= BIT(i);
 391                         continue;
 392                 }
 393
 394                 if (connector->force == DRM_FORCE_OFF) {
 395                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 396                                       connector->name);
 397                         enabled[i] = false;
 398                         continue;
 399                 }
 400
 401                 encoder = connector->state->best_encoder;
 402                 if (!encoder || WARN_ON(!connector->state->crtc)) {
 403                         if (connector->force > DRM_FORCE_OFF)
 404                                 goto bail;
 405
 406                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 407                                       connector->name);
 408                         enabled[i] = false;
 409                         conn_configured |= BIT(i);
 410                         continue;
 411                 }
 412
 413                 num_connectors_enabled++;
 414
 415                 intel_crtc = to_intel_crtc(connector->state->crtc);
 416                 for (j = 0; j < 256; j++) {
 417                         intel_crtc->lut_r[j] = j;
 418                         intel_crtc->lut_g[j] = j;
 419                         intel_crtc->lut_b[j] = j;
 420                 }
 421
 422                 new_crtc = intel_fb_helper_crtc(fb_helper,
 423                                                 connector->state->crtc);
 424
 425                 /*
 426                  * Make sure we're not trying to drive multiple connectors
 427                  * with a single CRTC, since our cloning support may not
 428                  * match the BIOS.
 429                  */
 430                 for (j = 0; j < count; j++) {
 431                         if (crtcs[j] == new_crtc) {
 432                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 433                                 goto bail;
 434                         }
 435                 }
 436
 437                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 438                               connector->name);
 439
 440                 /* go for command line mode first */
 441                 modes[i] = drm_pick_cmdline_mode(fb_conn);
 442
 443                 /* try for preferred next */
 444                 if (!modes[i]) {
 445                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 446                                       connector->name, connector->has_tile);
 447                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 448                                                           height);
 449                 }
 450
 451                 /* No preferred mode marked by the EDID? Are there any modes? */
 452                 if (!modes[i] && !list_empty(&connector->modes)) {
 453                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 454                                       connector->name);
 455                         modes[i] = list_first_entry(&connector->modes,
 456                                                     struct drm_display_mode,
 457                                                     head);
 458                 }
 459
 460                 /* last resort: use current mode */
 461                 if (!modes[i]) {
 462                         /*
 463                          * IMPORTANT: We want to use the adjusted mode (i.e.
 464                          * after the panel fitter upscaling) as the initial
 465                          * config, not the input mode, which is what crtc->mode
 466                          * usually contains. But since our current
 467                          * code puts a mode derived from the post-pfit timings
 468                          * into crtc->mode this works out correctly.
 469                          *
 470                          * This is crtc->mode and not crtc->state->mode for the
 471                          * fastboot check to work correctly. crtc_state->mode has
 472                          * I915_MODE_FLAG_INHERITED, which we clear to force check
 473                          * state.
 474                          */
 475                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 476                                       connector->name);
 477                         modes[i] = &connector->state->crtc->mode;
 478                 }
 479                 crtcs[i] = new_crtc;
 480
 481                 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
 482                               connector->name,
 483                               connector->state->crtc->base.id,
 484                               connector->state->crtc->name,
 485                               modes[i]->hdisplay, modes[i]->vdisplay,
 486                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 487
 488                 fallback = false;
 489                 conn_configured |= BIT(i);
 490         }
 491
 492         if ((conn_configured & mask) != mask && conn_configured != conn_seq)
 493                 goto retry;
 494
 495         /*
 496          * If the BIOS didn't enable everything it could, fall back to have the
 497          * same user experiencing of lighting up as much as possible like the
 498          * fbdev helper library.
 499          */
 500         if (num_connectors_enabled != num_connectors_detected &&
 501             num_connectors_enabled < INTEL_INFO(dev_priv)->num_pipes) {
 502                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 503                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 504                               num_connectors_detected);
 505                 fallback = true;
 506         }
 507
 508         if (fallback) {
 509 bail:
 510                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 511                 memcpy(enabled, save_enabled, count);
 512                 kfree(save_enabled);
 513                 return false;
 514         }
 515
 516         kfree(save_enabled);
 517         return true;
 518 }
 519
 520 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 521         .initial_config = intel_fb_initial_config,
 522         .gamma_set = intel_crtc_fb_gamma_set,
 523         .gamma_get = intel_crtc_fb_gamma_get,
 524         .fb_probe = intelfb_create,
 525 };
 526
 527 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 528 {
 529         /* We rely on the object-free to release the VMA pinning for
 530          * the info->screen_base mmaping. Leaking the VMA is simpler than
 531          * trying to rectify all the possible error paths leading here.
 532          */
 533
 534         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 535
 536         drm_fb_helper_fini(&ifbdev->helper);
 537
 538         if (ifbdev->vma) {
 539                 mutex_lock(&ifbdev->helper.dev->struct_mutex);
 540                 intel_unpin_fb_vma(ifbdev->vma);
 541                 mutex_unlock(&ifbdev->helper.dev->struct_mutex);
 542         }
 543
 544         if (ifbdev->fb)
 545                 drm_framebuffer_remove(&ifbdev->fb->base);
 546
 547         kfree(ifbdev);
 548 }
 549
 550 /*
 551  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 552  * The core display code will have read out the current plane configuration,
 553  * so we use that to figure out if there's an object for us to use as the
 554  * fb, and if so, we re-use it for the fbdev configuration.
 555  *
 556  * Note we only support a single fb shared across pipes for boot (mostly for
 557  * fbcon), so we just find the biggest and use that.
 558  */
 559 static bool intel_fbdev_init_bios(struct drm_device *dev,
 560                                  struct intel_fbdev *ifbdev)
 561 {
 562         struct intel_framebuffer *fb = NULL;
 563         struct drm_crtc *crtc;
 564         struct intel_crtc *intel_crtc;
 565         unsigned int max_size = 0;
 566
 567         /* Find the largest fb */
 568         for_each_crtc(dev, crtc) {
 569                 struct drm_i915_gem_object *obj =
 570                         intel_fb_obj(crtc->primary->state->fb);
 571                 intel_crtc = to_intel_crtc(crtc);
 572
 573                 if (!crtc->state->active || !obj) {
 574                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 575                                       pipe_name(intel_crtc->pipe));
 576                         continue;
 577                 }
 578
 579                 if (obj->base.size > max_size) {
 580                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 581                                       pipe_name(intel_crtc->pipe));
 582                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 583                         max_size = obj->base.size;
 584                 }
 585         }
 586
 587         if (!fb) {
 588                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 589                 goto out;
 590         }
 591
 592         /* Now make sure all the pipes will fit into it */
 593         for_each_crtc(dev, crtc) {
 594                 unsigned int cur_size;
 595
 596                 intel_crtc = to_intel_crtc(crtc);
 597
 598                 if (!crtc->state->active) {
 599                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 600                                       pipe_name(intel_crtc->pipe));
 601                         continue;
 602                 }
 603
 604                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 605                               pipe_name(intel_crtc->pipe));
 606
 607                 /*
 608                  * See if the plane fb we found above will fit on this
 609                  * pipe.  Note we need to use the selected fb's pitch and bpp
 610                  * rather than the current pipe's, since they differ.
 611                  */
 612                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 613                 cur_size = cur_size * fb->base.format->cpp[0];
 614                 if (fb->base.pitches[0] < cur_size) {
 615                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 616                                       pipe_name(intel_crtc->pipe),
 617                                       cur_size, fb->base.pitches[0]);
 618                         fb = NULL;
 619                         break;
 620                 }
 621
 622                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 623                 cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
 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.format->cpp[0] * 8,
 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                         fb = NULL;
 637                         break;
 638                 }
 639
 640                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 641                               pipe_name(intel_crtc->pipe),
 642                               max_size, cur_size);
 643         }
 644
 645         if (!fb) {
 646                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 647                 goto out;
 648         }
 649
 650         ifbdev->preferred_bpp = fb->base.format->cpp[0] * 8;
 651         ifbdev->fb = fb;
 652
 653         drm_framebuffer_reference(&ifbdev->fb->base);
 654
 655         /* Final pass to check if any active pipes don't have fbs */
 656         for_each_crtc(dev, crtc) {
 657                 intel_crtc = to_intel_crtc(crtc);
 658
 659                 if (!crtc->state->active)
 660                         continue;
 661
 662                 WARN(!crtc->primary->fb,
 663                      "re-used BIOS config but lost an fb on crtc %d\n",
 664                      crtc->base.id);
 665         }
 666
 667
 668         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 669         return true;
 670
 671 out:
 672
 673         return false;
 674 }
 675
 676 static void intel_fbdev_suspend_worker(struct work_struct *work)
 677 {
 678         intel_fbdev_set_suspend(&container_of(work,
 679                                               struct drm_i915_private,
 680                                               fbdev_suspend_work)->drm,
 681                                 FBINFO_STATE_RUNNING,
 682                                 true);
 683 }
 684
 685 int intel_fbdev_init(struct drm_device *dev)
 686 {
 687         struct drm_i915_private *dev_priv = to_i915(dev);
 688         struct intel_fbdev *ifbdev;
 689         int ret;
 690
 691         if (WARN_ON(INTEL_INFO(dev_priv)->num_pipes == 0))
 692                 return -ENODEV;
 693
 694         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 695         if (ifbdev == NULL)
 696                 return -ENOMEM;
 697
 698         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 699
 700         if (!intel_fbdev_init_bios(dev, ifbdev))
 701                 ifbdev->preferred_bpp = 32;
 702
 703         ret = drm_fb_helper_init(dev, &ifbdev->helper, 4);
 704         if (ret) {
 705                 kfree(ifbdev);
 706                 return ret;
 707         }
 708
 709         dev_priv->fbdev = ifbdev;
 710         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 711
 712         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 713
 714         return 0;
 715 }
 716
 717 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 718 {
 719         struct intel_fbdev *ifbdev = data;
 720
 721         /* Due to peculiar init order wrt to hpd handling this is separate. */
 722         if (drm_fb_helper_initial_config(&ifbdev->helper,
 723                                          ifbdev->preferred_bpp))
 724                 intel_fbdev_fini(ifbdev->helper.dev);
 725 }
 726
 727 void intel_fbdev_initial_config_async(struct drm_device *dev)
 728 {
 729         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 730
 731         if (!ifbdev)
 732                 return;
 733
 734         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 735 }
 736
 737 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 738 {
 739         if (!ifbdev->cookie)
 740                 return;
 741
 742         /* Only serialises with all preceding async calls, hence +1 */
 743         async_synchronize_cookie(ifbdev->cookie + 1);
 744         ifbdev->cookie = 0;
 745 }
 746
 747 void intel_fbdev_fini(struct drm_device *dev)
 748 {
 749         struct drm_i915_private *dev_priv = to_i915(dev);
 750         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 751
 752         if (!ifbdev)
 753                 return;
 754
 755         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 756         if (!current_is_async())
 757                 intel_fbdev_sync(ifbdev);
 758
 759         intel_fbdev_destroy(ifbdev);
 760         dev_priv->fbdev = NULL;
 761 }
 762
 763 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 764 {
 765         struct drm_i915_private *dev_priv = to_i915(dev);
 766         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 767         struct fb_info *info;
 768
 769         if (!ifbdev || !ifbdev->vma)
 770                 return;
 771
 772         info = ifbdev->helper.fbdev;
 773
 774         if (synchronous) {
 775                 /* Flush any pending work to turn the console on, and then
 776                  * wait to turn it off. It must be synchronous as we are
 777                  * about to suspend or unload the driver.
 778                  *
 779                  * Note that from within the work-handler, we cannot flush
 780                  * ourselves, so only flush outstanding work upon suspend!
 781                  */
 782                 if (state != FBINFO_STATE_RUNNING)
 783                         flush_work(&dev_priv->fbdev_suspend_work);
 784                 console_lock();
 785         } else {
 786                 /*
 787                  * The console lock can be pretty contented on resume due
 788                  * to all the printk activity.  Try to keep it out of the hot
 789                  * path of resume if possible.
 790                  */
 791                 WARN_ON(state != FBINFO_STATE_RUNNING);
 792                 if (!console_trylock()) {
 793                         /* Don't block our own workqueue as this can
 794                          * be run in parallel with other i915.ko tasks.
 795                          */
 796                         schedule_work(&dev_priv->fbdev_suspend_work);
 797                         return;
 798                 }
 799         }
 800
 801         /* On resume from hibernation: If the object is shmemfs backed, it has
 802          * been restored from swap. If the object is stolen however, it will be
 803          * full of whatever garbage was left in there.
 804          */
 805         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 806                 memset_io(info->screen_base, 0, info->screen_size);
 807
 808         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 809         console_unlock();
 810 }
 811
 812 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 813 {
 814         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 815
 816         if (ifbdev && ifbdev->vma)
 817                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 818 }
 819
 820 void intel_fbdev_restore_mode(struct drm_device *dev)
 821 {
 822         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 823
 824         if (!ifbdev)
 825                 return;
 826
 827         intel_fbdev_sync(ifbdev);
 828         if (!ifbdev->vma)
 829                 return;
 830
 831         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper) == 0)
 832                 intel_fbdev_invalidate(ifbdev);
 833 }