drivers/gpu/drm/i915/intel_fbdev.c

   1 /*
   2  * Copyright © 2007 David Airlie
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *     David Airlie
  25  */
  26
  27 #include <linux/async.h>
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/console.h>
  31 #include <linux/errno.h>
  32 #include <linux/string.h>
  33 #include <linux/mm.h>
  34 #include <linux/tty.h>
  35 #include <linux/sysrq.h>
  36 #include <linux/delay.h>
  37 #include <linux/fb.h>
  38 #include <linux/init.h>
  39 #include <linux/vga_switcheroo.h>
  40
  41 #include <drm/drmP.h>
  42 #include <drm/drm_crtc.h>
  43 #include <drm/drm_fb_helper.h>
  44 #include "intel_drv.h"
  45 #include <drm/i915_drm.h>
  46 #include "i915_drv.h"
  47
  48 static int intel_fbdev_set_par(struct fb_info *info)
  49 {
  50         struct drm_fb_helper *fb_helper = info->par;
  51         struct intel_fbdev *ifbdev =
  52                 container_of(fb_helper, struct intel_fbdev, helper);
  53         int ret;
  54
  55         ret = drm_fb_helper_set_par(info);
  56
  57         if (ret == 0) {
  58                 /*
  59                  * FIXME: fbdev presumes that all callbacks also work from
  60                  * atomic contexts and relies on that for emergency oops
  61                  * printing. KMS totally doesn't do that and the locking here is
  62                  * by far not the only place this goes wrong.  Ignore this for
  63                  * now until we solve this for real.
  64                  */
  65                 mutex_lock(&fb_helper->dev->struct_mutex);
  66                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  67                 mutex_unlock(&fb_helper->dev->struct_mutex);
  68         }
  69
  70         return ret;
  71 }
  72
  73 static int intel_fbdev_blank(int blank, struct fb_info *info)
  74 {
  75         struct drm_fb_helper *fb_helper = info->par;
  76         struct intel_fbdev *ifbdev =
  77                 container_of(fb_helper, struct intel_fbdev, helper);
  78         int ret;
  79
  80         ret = drm_fb_helper_blank(blank, info);
  81
  82         if (ret == 0) {
  83                 /*
  84                  * FIXME: fbdev presumes that all callbacks also work from
  85                  * atomic contexts and relies on that for emergency oops
  86                  * printing. KMS totally doesn't do that and the locking here is
  87                  * by far not the only place this goes wrong.  Ignore this for
  88                  * now until we solve this for real.
  89                  */
  90                 mutex_lock(&fb_helper->dev->struct_mutex);
  91                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  92                 mutex_unlock(&fb_helper->dev->struct_mutex);
  93         }
  94
  95         return ret;
  96 }
  97
  98 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  99                                    struct fb_info *info)
 100 {
 101         struct drm_fb_helper *fb_helper = info->par;
 102         struct intel_fbdev *ifbdev =
 103                 container_of(fb_helper, struct intel_fbdev, helper);
 104
 105         int ret;
 106         ret = drm_fb_helper_pan_display(var, info);
 107
 108         if (ret == 0) {
 109                 /*
 110                  * FIXME: fbdev presumes that all callbacks also work from
 111                  * atomic contexts and relies on that for emergency oops
 112                  * printing. KMS totally doesn't do that and the locking here is
 113                  * by far not the only place this goes wrong.  Ignore this for
 114                  * now until we solve this for real.
 115                  */
 116                 mutex_lock(&fb_helper->dev->struct_mutex);
 117                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 118                 mutex_unlock(&fb_helper->dev->struct_mutex);
 119         }
 120
 121         return ret;
 122 }
 123
 124 static struct fb_ops intelfb_ops = {
 125         .owner = THIS_MODULE,
 126         .fb_check_var = drm_fb_helper_check_var,
 127         .fb_set_par = intel_fbdev_set_par,
 128         .fb_fillrect = cfb_fillrect,
 129         .fb_copyarea = cfb_copyarea,
 130         .fb_imageblit = cfb_imageblit,
 131         .fb_pan_display = intel_fbdev_pan_display,
 132         .fb_blank = intel_fbdev_blank,
 133         .fb_setcmap = drm_fb_helper_setcmap,
 134         .fb_debug_enter = drm_fb_helper_debug_enter,
 135         .fb_debug_leave = drm_fb_helper_debug_leave,
 136 };
 137
 138 static int intelfb_alloc(struct drm_fb_helper *helper,
 139                          struct drm_fb_helper_surface_size *sizes)
 140 {
 141         struct intel_fbdev *ifbdev =
 142                 container_of(helper, struct intel_fbdev, helper);
 143         struct drm_framebuffer *fb;
 144         struct drm_device *dev = helper->dev;
 145         struct drm_mode_fb_cmd2 mode_cmd = {};
 146         struct drm_i915_gem_object *obj;
 147         int size, ret;
 148
 149         /* we don't do packed 24bpp */
 150         if (sizes->surface_bpp == 24)
 151                 sizes->surface_bpp = 32;
 152
 153         mode_cmd.width = sizes->surface_width;
 154         mode_cmd.height = sizes->surface_height;
 155
 156         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 157                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 158         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 159                                                           sizes->surface_depth);
 160
 161         size = mode_cmd.pitches[0] * mode_cmd.height;
 162         size = PAGE_ALIGN(size);
 163         obj = i915_gem_object_create_stolen(dev, size);
 164         if (obj == NULL)
 165                 obj = i915_gem_alloc_object(dev, size);
 166         if (!obj) {
 167                 DRM_ERROR("failed to allocate framebuffer\n");
 168                 ret = -ENOMEM;
 169                 goto out;
 170         }
 171
 172         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 173         if (IS_ERR(fb)) {
 174                 ret = PTR_ERR(fb);
 175                 goto out_unref;
 176         }
 177
 178         /* Flush everything out, we'll be doing GTT only from now on */
 179         ret = intel_pin_and_fence_fb_obj(NULL, fb, NULL, NULL, NULL);
 180         if (ret) {
 181                 DRM_ERROR("failed to pin obj: %d\n", ret);
 182                 goto out_fb;
 183         }
 184
 185         ifbdev->fb = to_intel_framebuffer(fb);
 186
 187         return 0;
 188
 189 out_fb:
 190         drm_framebuffer_remove(fb);
 191 out_unref:
 192         drm_gem_object_unreference(&obj->base);
 193 out:
 194         return ret;
 195 }
 196
 197 static int intelfb_create(struct drm_fb_helper *helper,
 198                           struct drm_fb_helper_surface_size *sizes)
 199 {
 200         struct intel_fbdev *ifbdev =
 201                 container_of(helper, struct intel_fbdev, helper);
 202         struct intel_framebuffer *intel_fb = ifbdev->fb;
 203         struct drm_device *dev = helper->dev;
 204         struct drm_i915_private *dev_priv = dev->dev_private;
 205         struct fb_info *info;
 206         struct drm_framebuffer *fb;
 207         struct drm_i915_gem_object *obj;
 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         info = framebuffer_alloc(0, &dev->pdev->dev);
 240         if (!info) {
 241                 ret = -ENOMEM;
 242                 goto out_unpin;
 243         }
 244
 245         info->par = helper;
 246
 247         fb = &ifbdev->fb->base;
 248
 249         ifbdev->helper.fb = fb;
 250         ifbdev->helper.fbdev = info;
 251
 252         strcpy(info->fix.id, "inteldrmfb");
 253
 254         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 255         info->fbops = &intelfb_ops;
 256
 257         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 258         if (ret) {
 259                 ret = -ENOMEM;
 260                 goto out_unpin;
 261         }
 262         /* setup aperture base/size for vesafb takeover */
 263         info->apertures = alloc_apertures(1);
 264         if (!info->apertures) {
 265                 ret = -ENOMEM;
 266                 goto out_unpin;
 267         }
 268         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 269         info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
 270
 271         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 272         info->fix.smem_len = size;
 273
 274         info->screen_base =
 275                 ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
 276                            size);
 277         if (!info->screen_base) {
 278                 ret = -ENOSPC;
 279                 goto out_unpin;
 280         }
 281         info->screen_size = size;
 282
 283         /* This driver doesn't need a VT switch to restore the mode on resume */
 284         info->skip_vt_switch = true;
 285
 286         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 287         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 288
 289         /* If the object is shmemfs backed, it will have given us zeroed pages.
 290          * If the object is stolen however, it will be full of whatever
 291          * garbage was left in there.
 292          */
 293         if (ifbdev->fb->obj->stolen && !prealloc)
 294                 memset_io(info->screen_base, 0, info->screen_size);
 295
 296         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 297
 298         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08llx, bo %p\n",
 299                       fb->width, fb->height,
 300                       i915_gem_obj_ggtt_offset(obj), obj);
 301
 302         mutex_unlock(&dev->struct_mutex);
 303         vga_switcheroo_client_fb_set(dev->pdev, info);
 304         return 0;
 305
 306 out_unpin:
 307         i915_gem_object_ggtt_unpin(obj);
 308         drm_gem_object_unreference(&obj->base);
 309 out_unlock:
 310         mutex_unlock(&dev->struct_mutex);
 311         return ret;
 312 }
 313
 314 /** Sets the color ramps on behalf of RandR */
 315 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 316                                     u16 blue, int regno)
 317 {
 318         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 319
 320         intel_crtc->lut_r[regno] = red >> 8;
 321         intel_crtc->lut_g[regno] = green >> 8;
 322         intel_crtc->lut_b[regno] = blue >> 8;
 323 }
 324
 325 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 326                                     u16 *blue, int regno)
 327 {
 328         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 329
 330         *red = intel_crtc->lut_r[regno] << 8;
 331         *green = intel_crtc->lut_g[regno] << 8;
 332         *blue = intel_crtc->lut_b[regno] << 8;
 333 }
 334
 335 static struct drm_fb_helper_crtc *
 336 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 337 {
 338         int i;
 339
 340         for (i = 0; i < fb_helper->crtc_count; i++)
 341                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 342                         return &fb_helper->crtc_info[i];
 343
 344         return NULL;
 345 }
 346
 347 /*
 348  * Try to read the BIOS display configuration and use it for the initial
 349  * fb configuration.
 350  *
 351  * The BIOS or boot loader will generally create an initial display
 352  * configuration for us that includes some set of active pipes and displays.
 353  * This routine tries to figure out which pipes and connectors are active
 354  * and stuffs them into the crtcs and modes array given to us by the
 355  * drm_fb_helper code.
 356  *
 357  * The overall sequence is:
 358  *   intel_fbdev_init - from driver load
 359  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 360  *     drm_fb_helper_init - build fb helper structs
 361  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 362  *   intel_fbdev_initial_config - apply the config
 363  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 364  *         drm_setup_crtcs - build crtc config for fbdev
 365  *           intel_fb_initial_config - find active connectors etc
 366  *         drm_fb_helper_single_fb_probe - set up fbdev
 367  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 368  *
 369  * Note that we don't make special consideration whether we could actually
 370  * switch to the selected modes without a full modeset. E.g. when the display
 371  * is in VGA mode we need to recalculate watermarks and set a new high-res
 372  * framebuffer anyway.
 373  */
 374 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 375                                     struct drm_fb_helper_crtc **crtcs,
 376                                     struct drm_display_mode **modes,
 377                                     struct drm_fb_offset *offsets,
 378                                     bool *enabled, int width, int height)
 379 {
 380         struct drm_device *dev = fb_helper->dev;
 381         int i, j;
 382         bool *save_enabled;
 383         bool fallback = true;
 384         int num_connectors_enabled = 0;
 385         int num_connectors_detected = 0;
 386         uint64_t conn_configured = 0, mask;
 387         int pass = 0;
 388
 389         save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),
 390                                GFP_KERNEL);
 391         if (!save_enabled)
 392                 return false;
 393
 394         memcpy(save_enabled, enabled, dev->mode_config.num_connector);
 395         mask = (1 << fb_helper->connector_count) - 1;
 396 retry:
 397         for (i = 0; i < fb_helper->connector_count; i++) {
 398                 struct drm_fb_helper_connector *fb_conn;
 399                 struct drm_connector *connector;
 400                 struct drm_encoder *encoder;
 401                 struct drm_fb_helper_crtc *new_crtc;
 402
 403                 fb_conn = fb_helper->connector_info[i];
 404                 connector = fb_conn->connector;
 405
 406                 if (conn_configured & (1 << i))
 407                         continue;
 408
 409                 if (pass == 0 && !connector->has_tile)
 410                         continue;
 411
 412                 if (connector->status == connector_status_connected)
 413                         num_connectors_detected++;
 414
 415                 if (!enabled[i]) {
 416                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 417                                       connector->name);
 418                         conn_configured |= (1 << i);
 419                         continue;
 420                 }
 421
 422                 if (connector->force == DRM_FORCE_OFF) {
 423                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 424                                       connector->name);
 425                         enabled[i] = false;
 426                         continue;
 427                 }
 428
 429                 encoder = connector->encoder;
 430                 if (!encoder || WARN_ON(!encoder->crtc)) {
 431                         if (connector->force > DRM_FORCE_OFF)
 432                                 goto bail;
 433
 434                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 435                                       connector->name);
 436                         enabled[i] = false;
 437                         conn_configured |= (1 << i);
 438                         continue;
 439                 }
 440
 441                 num_connectors_enabled++;
 442
 443                 new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);
 444
 445                 /*
 446                  * Make sure we're not trying to drive multiple connectors
 447                  * with a single CRTC, since our cloning support may not
 448                  * match the BIOS.
 449                  */
 450                 for (j = 0; j < fb_helper->connector_count; j++) {
 451                         if (crtcs[j] == new_crtc) {
 452                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 453                                 goto bail;
 454                         }
 455                 }
 456
 457                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 458                               connector->name);
 459
 460                 /* go for command line mode first */
 461                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 462
 463                 /* try for preferred next */
 464                 if (!modes[i]) {
 465                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 466                                       connector->name, connector->has_tile);
 467                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 468                                                           height);
 469                 }
 470
 471                 /* No preferred mode marked by the EDID? Are there any modes? */
 472                 if (!modes[i] && !list_empty(&connector->modes)) {
 473                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 474                                       connector->name);
 475                         modes[i] = list_first_entry(&connector->modes,
 476                                                     struct drm_display_mode,
 477                                                     head);
 478                 }
 479
 480                 /* last resort: use current mode */
 481                 if (!modes[i]) {
 482                         /*
 483                          * IMPORTANT: We want to use the adjusted mode (i.e.
 484                          * after the panel fitter upscaling) as the initial
 485                          * config, not the input mode, which is what crtc->mode
 486                          * usually contains. But since our current
 487                          * code puts a mode derived from the post-pfit timings
 488                          * into crtc->mode this works out correctly.
 489                          */
 490                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 491                                       connector->name);
 492                         modes[i] = &encoder->crtc->mode;
 493                 }
 494                 crtcs[i] = new_crtc;
 495
 496                 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
 497                               connector->name,
 498                               pipe_name(to_intel_crtc(encoder->crtc)->pipe),
 499                               encoder->crtc->base.id,
 500                               modes[i]->hdisplay, modes[i]->vdisplay,
 501                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 502
 503                 fallback = false;
 504                 conn_configured |= (1 << i);
 505         }
 506
 507         if ((conn_configured & mask) != mask) {
 508                 pass++;
 509                 goto retry;
 510         }
 511
 512         /*
 513          * If the BIOS didn't enable everything it could, fall back to have the
 514          * same user experiencing of lighting up as much as possible like the
 515          * fbdev helper library.
 516          */
 517         if (num_connectors_enabled != num_connectors_detected &&
 518             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 519                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 520                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 521                               num_connectors_detected);
 522                 fallback = true;
 523         }
 524
 525         if (fallback) {
 526 bail:
 527                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 528                 memcpy(enabled, save_enabled, dev->mode_config.num_connector);
 529                 kfree(save_enabled);
 530                 return false;
 531         }
 532
 533         kfree(save_enabled);
 534         return true;
 535 }
 536
 537 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 538         .initial_config = intel_fb_initial_config,
 539         .gamma_set = intel_crtc_fb_gamma_set,
 540         .gamma_get = intel_crtc_fb_gamma_get,
 541         .fb_probe = intelfb_create,
 542 };
 543
 544 static void intel_fbdev_destroy(struct drm_device *dev,
 545                                 struct intel_fbdev *ifbdev)
 546 {
 547         if (ifbdev->helper.fbdev) {
 548                 struct fb_info *info = ifbdev->helper.fbdev;
 549
 550                 unregister_framebuffer(info);
 551                 iounmap(info->screen_base);
 552                 if (info->cmap.len)
 553                         fb_dealloc_cmap(&info->cmap);
 554
 555                 framebuffer_release(info);
 556         }
 557
 558         drm_fb_helper_fini(&ifbdev->helper);
 559
 560         drm_framebuffer_unregister_private(&ifbdev->fb->base);
 561         drm_framebuffer_remove(&ifbdev->fb->base);
 562 }
 563
 564 /*
 565  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 566  * The core display code will have read out the current plane configuration,
 567  * so we use that to figure out if there's an object for us to use as the
 568  * fb, and if so, we re-use it for the fbdev configuration.
 569  *
 570  * Note we only support a single fb shared across pipes for boot (mostly for
 571  * fbcon), so we just find the biggest and use that.
 572  */
 573 static bool intel_fbdev_init_bios(struct drm_device *dev,
 574                                  struct intel_fbdev *ifbdev)
 575 {
 576         struct intel_framebuffer *fb = NULL;
 577         struct drm_crtc *crtc;
 578         struct intel_crtc *intel_crtc;
 579         unsigned int max_size = 0;
 580
 581         if (!i915.fastboot)
 582                 return false;
 583
 584         /* Find the largest fb */
 585         for_each_crtc(dev, crtc) {
 586                 struct drm_i915_gem_object *obj =
 587                         intel_fb_obj(crtc->primary->state->fb);
 588                 intel_crtc = to_intel_crtc(crtc);
 589
 590                 if (!intel_crtc->active || !obj) {
 591                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 592                                       pipe_name(intel_crtc->pipe));
 593                         continue;
 594                 }
 595
 596                 if (obj->base.size > max_size) {
 597                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 598                                       pipe_name(intel_crtc->pipe));
 599                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 600                         max_size = obj->base.size;
 601                 }
 602         }
 603
 604         if (!fb) {
 605                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 606                 goto out;
 607         }
 608
 609         /* Now make sure all the pipes will fit into it */
 610         for_each_crtc(dev, crtc) {
 611                 unsigned int cur_size;
 612
 613                 intel_crtc = to_intel_crtc(crtc);
 614
 615                 if (!intel_crtc->active) {
 616                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 617                                       pipe_name(intel_crtc->pipe));
 618                         continue;
 619                 }
 620
 621                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 622                               pipe_name(intel_crtc->pipe));
 623
 624                 /*
 625                  * See if the plane fb we found above will fit on this
 626                  * pipe.  Note we need to use the selected fb's pitch and bpp
 627                  * rather than the current pipe's, since they differ.
 628                  */
 629                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 630                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 631                 if (fb->base.pitches[0] < cur_size) {
 632                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 633                                       pipe_name(intel_crtc->pipe),
 634                                       cur_size, fb->base.pitches[0]);
 635                         fb = NULL;
 636                         break;
 637                 }
 638
 639                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 640                 cur_size = intel_fb_align_height(dev, cur_size,
 641                                                  fb->base.pixel_format,
 642                                                  fb->base.modifier[0]);
 643                 cur_size *= fb->base.pitches[0];
 644                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 645                               pipe_name(intel_crtc->pipe),
 646                               intel_crtc->config->base.adjusted_mode.crtc_hdisplay,
 647                               intel_crtc->config->base.adjusted_mode.crtc_vdisplay,
 648                               fb->base.bits_per_pixel,
 649                               cur_size);
 650
 651                 if (cur_size > max_size) {
 652                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 653                                       pipe_name(intel_crtc->pipe),
 654                                       cur_size, max_size);
 655                         fb = NULL;
 656                         break;
 657                 }
 658
 659                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 660                               pipe_name(intel_crtc->pipe),
 661                               max_size, cur_size);
 662         }
 663
 664         if (!fb) {
 665                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 666                 goto out;
 667         }
 668
 669         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 670         ifbdev->fb = fb;
 671
 672         drm_framebuffer_reference(&ifbdev->fb->base);
 673
 674         /* Final pass to check if any active pipes don't have fbs */
 675         for_each_crtc(dev, crtc) {
 676                 intel_crtc = to_intel_crtc(crtc);
 677
 678                 if (!intel_crtc->active)
 679                         continue;
 680
 681                 WARN(!crtc->primary->fb,
 682                      "re-used BIOS config but lost an fb on crtc %d\n",
 683                      crtc->base.id);
 684         }
 685
 686
 687         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 688         return true;
 689
 690 out:
 691
 692         return false;
 693 }
 694
 695 static void intel_fbdev_suspend_worker(struct work_struct *work)
 696 {
 697         intel_fbdev_set_suspend(container_of(work,
 698                                              struct drm_i915_private,
 699                                              fbdev_suspend_work)->dev,
 700                                 FBINFO_STATE_RUNNING,
 701                                 true);
 702 }
 703
 704 int intel_fbdev_init(struct drm_device *dev)
 705 {
 706         struct intel_fbdev *ifbdev;
 707         struct drm_i915_private *dev_priv = dev->dev_private;
 708         int ret;
 709
 710         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 711                 return -ENODEV;
 712
 713         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 714         if (ifbdev == NULL)
 715                 return -ENOMEM;
 716
 717         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 718
 719         if (!intel_fbdev_init_bios(dev, ifbdev))
 720                 ifbdev->preferred_bpp = 32;
 721
 722         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 723                                  INTEL_INFO(dev)->num_pipes, 4);
 724         if (ret) {
 725                 kfree(ifbdev);
 726                 return ret;
 727         }
 728
 729         dev_priv->fbdev = ifbdev;
 730         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 731
 732         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 733
 734         return 0;
 735 }
 736
 737 void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 738 {
 739         struct drm_i915_private *dev_priv = data;
 740         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 741
 742         /* Due to peculiar init order wrt to hpd handling this is separate. */
 743         drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp);
 744 }
 745
 746 void intel_fbdev_fini(struct drm_device *dev)
 747 {
 748         struct drm_i915_private *dev_priv = dev->dev_private;
 749         if (!dev_priv->fbdev)
 750                 return;
 751
 752         flush_work(&dev_priv->fbdev_suspend_work);
 753
 754         async_synchronize_full();
 755         intel_fbdev_destroy(dev, dev_priv->fbdev);
 756         kfree(dev_priv->fbdev);
 757         dev_priv->fbdev = NULL;
 758 }
 759
 760 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 761 {
 762         struct drm_i915_private *dev_priv = dev->dev_private;
 763         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 764         struct fb_info *info;
 765
 766         if (!ifbdev)
 767                 return;
 768
 769         info = ifbdev->helper.fbdev;
 770
 771         if (synchronous) {
 772                 /* Flush any pending work to turn the console on, and then
 773                  * wait to turn it off. It must be synchronous as we are
 774                  * about to suspend or unload the driver.
 775                  *
 776                  * Note that from within the work-handler, we cannot flush
 777                  * ourselves, so only flush outstanding work upon suspend!
 778                  */
 779                 if (state != FBINFO_STATE_RUNNING)
 780                         flush_work(&dev_priv->fbdev_suspend_work);
 781                 console_lock();
 782         } else {
 783                 /*
 784                  * The console lock can be pretty contented on resume due
 785                  * to all the printk activity.  Try to keep it out of the hot
 786                  * path of resume if possible.
 787                  */
 788                 WARN_ON(state != FBINFO_STATE_RUNNING);
 789                 if (!console_trylock()) {
 790                         /* Don't block our own workqueue as this can
 791                          * be run in parallel with other i915.ko tasks.
 792                          */
 793                         schedule_work(&dev_priv->fbdev_suspend_work);
 794                         return;
 795                 }
 796         }
 797
 798         /* On resume from hibernation: If the object is shmemfs backed, it has
 799          * been restored from swap. If the object is stolen however, it will be
 800          * full of whatever garbage was left in there.
 801          */
 802         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 803                 memset_io(info->screen_base, 0, info->screen_size);
 804
 805         fb_set_suspend(info, state);
 806         console_unlock();
 807 }
 808
 809 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 810 {
 811         struct drm_i915_private *dev_priv = dev->dev_private;
 812         if (dev_priv->fbdev)
 813                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 814 }
 815
 816 void intel_fbdev_restore_mode(struct drm_device *dev)
 817 {
 818         int ret;
 819         struct drm_i915_private *dev_priv = dev->dev_private;
 820         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 821         struct drm_fb_helper *fb_helper;
 822
 823         if (!ifbdev)
 824                 return;
 825
 826         fb_helper = &ifbdev->helper;
 827
 828         ret = drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
 829         if (ret) {
 830                 DRM_DEBUG("failed to restore crtc mode\n");
 831         } else {
 832                 mutex_lock(&fb_helper->dev->struct_mutex);
 833                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 834                 mutex_unlock(&fb_helper->dev->struct_mutex);
 835         }
 836 }