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 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                 mutex_lock(&fb_helper->dev->struct_mutex);
  59                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  60                 mutex_unlock(&fb_helper->dev->struct_mutex);
  61         }
  62
  63         return ret;
  64 }
  65
  66 static int intel_fbdev_blank(int blank, struct fb_info *info)
  67 {
  68         struct drm_fb_helper *fb_helper = info->par;
  69         struct intel_fbdev *ifbdev =
  70                 container_of(fb_helper, struct intel_fbdev, helper);
  71         int ret;
  72
  73         ret = drm_fb_helper_blank(blank, info);
  74
  75         if (ret == 0) {
  76                 mutex_lock(&fb_helper->dev->struct_mutex);
  77                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  78                 mutex_unlock(&fb_helper->dev->struct_mutex);
  79         }
  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
  91         int ret;
  92         ret = drm_fb_helper_pan_display(var, info);
  93
  94         if (ret == 0) {
  95                 mutex_lock(&fb_helper->dev->struct_mutex);
  96                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  97                 mutex_unlock(&fb_helper->dev->struct_mutex);
  98         }
  99
 100         return ret;
 101 }
 102
 103 static struct fb_ops intelfb_ops = {
 104         .owner = THIS_MODULE,
 105         DRM_FB_HELPER_DEFAULT_OPS,
 106         .fb_set_par = intel_fbdev_set_par,
 107         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 108         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 109         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 110         .fb_pan_display = intel_fbdev_pan_display,
 111         .fb_blank = intel_fbdev_blank,
 112 };
 113
 114 static int intelfb_alloc(struct drm_fb_helper *helper,
 115                          struct drm_fb_helper_surface_size *sizes)
 116 {
 117         struct intel_fbdev *ifbdev =
 118                 container_of(helper, struct intel_fbdev, helper);
 119         struct drm_framebuffer *fb;
 120         struct drm_device *dev = helper->dev;
 121         struct drm_i915_private *dev_priv = to_i915(dev);
 122         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 123         struct drm_mode_fb_cmd2 mode_cmd = {};
 124         struct drm_i915_gem_object *obj = NULL;
 125         int size, ret;
 126
 127         /* we don't do packed 24bpp */
 128         if (sizes->surface_bpp == 24)
 129                 sizes->surface_bpp = 32;
 130
 131         mode_cmd.width = sizes->surface_width;
 132         mode_cmd.height = sizes->surface_height;
 133
 134         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 135                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 136         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 137                                                           sizes->surface_depth);
 138
 139         mutex_lock(&dev->struct_mutex);
 140
 141         size = mode_cmd.pitches[0] * mode_cmd.height;
 142         size = PAGE_ALIGN(size);
 143
 144         /* If the FB is too big, just don't use it since fbdev is not very
 145          * important and we should probably use that space with FBC or other
 146          * features. */
 147         if (size * 2 < ggtt->stolen_usable_size)
 148                 obj = i915_gem_object_create_stolen(dev, size);
 149         if (obj == NULL)
 150                 obj = i915_gem_object_create(dev, size);
 151         if (IS_ERR(obj)) {
 152                 DRM_ERROR("failed to allocate framebuffer\n");
 153                 ret = PTR_ERR(obj);
 154                 goto out;
 155         }
 156
 157         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 158         if (IS_ERR(fb)) {
 159                 i915_gem_object_put(obj);
 160                 ret = PTR_ERR(fb);
 161                 goto out;
 162         }
 163
 164         mutex_unlock(&dev->struct_mutex);
 165
 166         ifbdev->fb = to_intel_framebuffer(fb);
 167
 168         return 0;
 169
 170 out:
 171         mutex_unlock(&dev->struct_mutex);
 172         return ret;
 173 }
 174
 175 static int intelfb_create(struct drm_fb_helper *helper,
 176                           struct drm_fb_helper_surface_size *sizes)
 177 {
 178         struct intel_fbdev *ifbdev =
 179                 container_of(helper, struct intel_fbdev, helper);
 180         struct intel_framebuffer *intel_fb = ifbdev->fb;
 181         struct drm_device *dev = helper->dev;
 182         struct drm_i915_private *dev_priv = to_i915(dev);
 183         struct pci_dev *pdev = dev_priv->drm.pdev;
 184         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 185         struct fb_info *info;
 186         struct drm_framebuffer *fb;
 187         struct i915_vma *vma;
 188         bool prealloc = false;
 189         void __iomem *vaddr;
 190         int ret;
 191
 192         if (intel_fb &&
 193             (sizes->fb_width > intel_fb->base.width ||
 194              sizes->fb_height > intel_fb->base.height)) {
 195                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 196                               " releasing it\n",
 197                               intel_fb->base.width, intel_fb->base.height,
 198                               sizes->fb_width, sizes->fb_height);
 199                 drm_framebuffer_unreference(&intel_fb->base);
 200                 intel_fb = ifbdev->fb = NULL;
 201         }
 202         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 203                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 204                 ret = intelfb_alloc(helper, sizes);
 205                 if (ret)
 206                         return ret;
 207                 intel_fb = ifbdev->fb;
 208         } else {
 209                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 210                 prealloc = true;
 211                 sizes->fb_width = intel_fb->base.width;
 212                 sizes->fb_height = intel_fb->base.height;
 213         }
 214
 215         mutex_lock(&dev->struct_mutex);
 216
 217         /* Pin the GGTT vma for our access via info->screen_base.
 218          * This also validates that any existing fb inherited from the
 219          * BIOS is suitable for own access.
 220          */
 221         vma = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, DRM_ROTATE_0);
 222         if (IS_ERR(vma)) {
 223                 ret = PTR_ERR(vma);
 224                 goto out_unlock;
 225         }
 226
 227         info = drm_fb_helper_alloc_fbi(helper);
 228         if (IS_ERR(info)) {
 229                 DRM_ERROR("Failed to allocate fb_info\n");
 230                 ret = PTR_ERR(info);
 231                 goto out_unpin;
 232         }
 233
 234         info->par = helper;
 235
 236         fb = &ifbdev->fb->base;
 237
 238         ifbdev->helper.fb = fb;
 239
 240         strcpy(info->fix.id, "inteldrmfb");
 241
 242         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 243         info->fbops = &intelfb_ops;
 244
 245         /* setup aperture base/size for vesafb takeover */
 246         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 247         info->apertures->ranges[0].size = ggtt->mappable_end;
 248
 249         info->fix.smem_start = dev->mode_config.fb_base + i915_ggtt_offset(vma);
 250         info->fix.smem_len = vma->node.size;
 251
 252         vaddr = i915_vma_pin_iomap(vma);
 253         if (IS_ERR(vaddr)) {
 254                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 255                 ret = PTR_ERR(vaddr);
 256                 goto out_destroy_fbi;
 257         }
 258         info->screen_base = vaddr;
 259         info->screen_size = vma->node.size;
 260
 261         /* This driver doesn't need a VT switch to restore the mode on resume */
 262         info->skip_vt_switch = true;
 263
 264         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 265         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 266
 267         /* If the object is shmemfs backed, it will have given us zeroed pages.
 268          * If the object is stolen however, it will be full of whatever
 269          * garbage was left in there.
 270          */
 271         if (intel_fb->obj->stolen && !prealloc)
 272                 memset_io(info->screen_base, 0, info->screen_size);
 273
 274         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 275
 276         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08x\n",
 277                       fb->width, fb->height, i915_ggtt_offset(vma));
 278         ifbdev->vma = vma;
 279
 280         mutex_unlock(&dev->struct_mutex);
 281         vga_switcheroo_client_fb_set(pdev, info);
 282         return 0;
 283
 284 out_destroy_fbi:
 285         drm_fb_helper_release_fbi(helper);
 286 out_unpin:
 287         intel_unpin_fb_vma(vma);
 288 out_unlock:
 289         mutex_unlock(&dev->struct_mutex);
 290         return ret;
 291 }
 292
 293 /** Sets the color ramps on behalf of RandR */
 294 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 295                                     u16 blue, int regno)
 296 {
 297         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 298
 299         intel_crtc->lut_r[regno] = red >> 8;
 300         intel_crtc->lut_g[regno] = green >> 8;
 301         intel_crtc->lut_b[regno] = blue >> 8;
 302 }
 303
 304 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 305                                     u16 *blue, int regno)
 306 {
 307         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 308
 309         *red = intel_crtc->lut_r[regno] << 8;
 310         *green = intel_crtc->lut_g[regno] << 8;
 311         *blue = intel_crtc->lut_b[regno] << 8;
 312 }
 313
 314 static struct drm_fb_helper_crtc *
 315 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 316 {
 317         int i;
 318
 319         for (i = 0; i < fb_helper->crtc_count; i++)
 320                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 321                         return &fb_helper->crtc_info[i];
 322
 323         return NULL;
 324 }
 325
 326 /*
 327  * Try to read the BIOS display configuration and use it for the initial
 328  * fb configuration.
 329  *
 330  * The BIOS or boot loader will generally create an initial display
 331  * configuration for us that includes some set of active pipes and displays.
 332  * This routine tries to figure out which pipes and connectors are active
 333  * and stuffs them into the crtcs and modes array given to us by the
 334  * drm_fb_helper code.
 335  *
 336  * The overall sequence is:
 337  *   intel_fbdev_init - from driver load
 338  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 339  *     drm_fb_helper_init - build fb helper structs
 340  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 341  *   intel_fbdev_initial_config - apply the config
 342  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 343  *         drm_setup_crtcs - build crtc config for fbdev
 344  *           intel_fb_initial_config - find active connectors etc
 345  *         drm_fb_helper_single_fb_probe - set up fbdev
 346  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 347  *
 348  * Note that we don't make special consideration whether we could actually
 349  * switch to the selected modes without a full modeset. E.g. when the display
 350  * is in VGA mode we need to recalculate watermarks and set a new high-res
 351  * framebuffer anyway.
 352  */
 353 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 354                                     struct drm_fb_helper_crtc **crtcs,
 355                                     struct drm_display_mode **modes,
 356                                     struct drm_fb_offset *offsets,
 357                                     bool *enabled, int width, int height)
 358 {
 359         struct drm_i915_private *dev_priv = to_i915(fb_helper->dev);
 360         unsigned long conn_configured, mask;
 361         unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
 362         int i, j;
 363         bool *save_enabled;
 364         bool fallback = true;
 365         int num_connectors_enabled = 0;
 366         int num_connectors_detected = 0;
 367         int pass = 0;
 368
 369         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
 370         if (!save_enabled)
 371                 return false;
 372
 373         memcpy(save_enabled, enabled, count);
 374         mask = BIT(count) - 1;
 375         conn_configured = 0;
 376 retry:
 377         for (i = 0; i < count; i++) {
 378                 struct drm_fb_helper_connector *fb_conn;
 379                 struct drm_connector *connector;
 380                 struct drm_encoder *encoder;
 381                 struct drm_fb_helper_crtc *new_crtc;
 382                 struct intel_crtc *intel_crtc;
 383
 384                 fb_conn = fb_helper->connector_info[i];
 385                 connector = fb_conn->connector;
 386
 387                 if (conn_configured & BIT(i))
 388                         continue;
 389
 390                 if (pass == 0 && !connector->has_tile)
 391                         continue;
 392
 393                 if (connector->status == connector_status_connected)
 394                         num_connectors_detected++;
 395
 396                 if (!enabled[i]) {
 397                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 398                                       connector->name);
 399                         conn_configured |= BIT(i);
 400                         continue;
 401                 }
 402
 403                 if (connector->force == DRM_FORCE_OFF) {
 404                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 405                                       connector->name);
 406                         enabled[i] = false;
 407                         continue;
 408                 }
 409
 410                 encoder = connector->state->best_encoder;
 411                 if (!encoder || WARN_ON(!connector->state->crtc)) {
 412                         if (connector->force > DRM_FORCE_OFF)
 413                                 goto bail;
 414
 415                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 416                                       connector->name);
 417                         enabled[i] = false;
 418                         conn_configured |= BIT(i);
 419                         continue;
 420                 }
 421
 422                 num_connectors_enabled++;
 423
 424                 intel_crtc = to_intel_crtc(connector->state->crtc);
 425                 for (j = 0; j < 256; j++) {
 426                         intel_crtc->lut_r[j] = j;
 427                         intel_crtc->lut_g[j] = j;
 428                         intel_crtc->lut_b[j] = j;
 429                 }
 430
 431                 new_crtc = intel_fb_helper_crtc(fb_helper,
 432                                                 connector->state->crtc);
 433
 434                 /*
 435                  * Make sure we're not trying to drive multiple connectors
 436                  * with a single CRTC, since our cloning support may not
 437                  * match the BIOS.
 438                  */
 439                 for (j = 0; j < count; j++) {
 440                         if (crtcs[j] == new_crtc) {
 441                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 442                                 goto bail;
 443                         }
 444                 }
 445
 446                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 447                               connector->name);
 448
 449                 /* go for command line mode first */
 450                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 451
 452                 /* try for preferred next */
 453                 if (!modes[i]) {
 454                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 455                                       connector->name, connector->has_tile);
 456                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 457                                                           height);
 458                 }
 459
 460                 /* No preferred mode marked by the EDID? Are there any modes? */
 461                 if (!modes[i] && !list_empty(&connector->modes)) {
 462                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 463                                       connector->name);
 464                         modes[i] = list_first_entry(&connector->modes,
 465                                                     struct drm_display_mode,
 466                                                     head);
 467                 }
 468
 469                 /* last resort: use current mode */
 470                 if (!modes[i]) {
 471                         /*
 472                          * IMPORTANT: We want to use the adjusted mode (i.e.
 473                          * after the panel fitter upscaling) as the initial
 474                          * config, not the input mode, which is what crtc->mode
 475                          * usually contains. But since our current
 476                          * code puts a mode derived from the post-pfit timings
 477                          * into crtc->mode this works out correctly.
 478                          *
 479                          * This is crtc->mode and not crtc->state->mode for the
 480                          * fastboot check to work correctly. crtc_state->mode has
 481                          * I915_MODE_FLAG_INHERITED, which we clear to force check
 482                          * state.
 483                          */
 484                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 485                                       connector->name);
 486                         modes[i] = &connector->state->crtc->mode;
 487                 }
 488                 crtcs[i] = new_crtc;
 489
 490                 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
 491                               connector->name,
 492                               connector->state->crtc->base.id,
 493                               connector->state->crtc->name,
 494                               modes[i]->hdisplay, modes[i]->vdisplay,
 495                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 496
 497                 fallback = false;
 498                 conn_configured |= BIT(i);
 499         }
 500
 501         if ((conn_configured & mask) != mask) {
 502                 pass++;
 503                 goto retry;
 504         }
 505
 506         /*
 507          * If the BIOS didn't enable everything it could, fall back to have the
 508          * same user experiencing of lighting up as much as possible like the
 509          * fbdev helper library.
 510          */
 511         if (num_connectors_enabled != num_connectors_detected &&
 512             num_connectors_enabled < INTEL_INFO(dev_priv)->num_pipes) {
 513                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 514                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 515                               num_connectors_detected);
 516                 fallback = true;
 517         }
 518
 519         if (fallback) {
 520 bail:
 521                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 522                 memcpy(enabled, save_enabled, count);
 523                 kfree(save_enabled);
 524                 return false;
 525         }
 526
 527         kfree(save_enabled);
 528         return true;
 529 }
 530
 531 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 532         .initial_config = intel_fb_initial_config,
 533         .gamma_set = intel_crtc_fb_gamma_set,
 534         .gamma_get = intel_crtc_fb_gamma_get,
 535         .fb_probe = intelfb_create,
 536 };
 537
 538 static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
 539 {
 540         /* We rely on the object-free to release the VMA pinning for
 541          * the info->screen_base mmaping. Leaking the VMA is simpler than
 542          * trying to rectify all the possible error paths leading here.
 543          */
 544
 545         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 546         drm_fb_helper_release_fbi(&ifbdev->helper);
 547
 548         drm_fb_helper_fini(&ifbdev->helper);
 549
 550         if (ifbdev->fb) {
 551                 mutex_lock(&ifbdev->helper.dev->struct_mutex);
 552                 intel_unpin_fb_vma(ifbdev->vma);
 553                 mutex_unlock(&ifbdev->helper.dev->struct_mutex);
 554
 555                 drm_framebuffer_remove(&ifbdev->fb->base);
 556         }
 557
 558         kfree(ifbdev);
 559 }
 560
 561 /*
 562  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 563  * The core display code will have read out the current plane configuration,
 564  * so we use that to figure out if there's an object for us to use as the
 565  * fb, and if so, we re-use it for the fbdev configuration.
 566  *
 567  * Note we only support a single fb shared across pipes for boot (mostly for
 568  * fbcon), so we just find the biggest and use that.
 569  */
 570 static bool intel_fbdev_init_bios(struct drm_device *dev,
 571                                  struct intel_fbdev *ifbdev)
 572 {
 573         struct intel_framebuffer *fb = NULL;
 574         struct drm_crtc *crtc;
 575         struct intel_crtc *intel_crtc;
 576         unsigned int max_size = 0;
 577
 578         /* Find the largest fb */
 579         for_each_crtc(dev, crtc) {
 580                 struct drm_i915_gem_object *obj =
 581                         intel_fb_obj(crtc->primary->state->fb);
 582                 intel_crtc = to_intel_crtc(crtc);
 583
 584                 if (!crtc->state->active || !obj) {
 585                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 586                                       pipe_name(intel_crtc->pipe));
 587                         continue;
 588                 }
 589
 590                 if (obj->base.size > max_size) {
 591                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 592                                       pipe_name(intel_crtc->pipe));
 593                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 594                         max_size = obj->base.size;
 595                 }
 596         }
 597
 598         if (!fb) {
 599                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 600                 goto out;
 601         }
 602
 603         /* Now make sure all the pipes will fit into it */
 604         for_each_crtc(dev, crtc) {
 605                 unsigned int cur_size;
 606
 607                 intel_crtc = to_intel_crtc(crtc);
 608
 609                 if (!crtc->state->active) {
 610                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 611                                       pipe_name(intel_crtc->pipe));
 612                         continue;
 613                 }
 614
 615                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 616                               pipe_name(intel_crtc->pipe));
 617
 618                 /*
 619                  * See if the plane fb we found above will fit on this
 620                  * pipe.  Note we need to use the selected fb's pitch and bpp
 621                  * rather than the current pipe's, since they differ.
 622                  */
 623                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 624                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 625                 if (fb->base.pitches[0] < cur_size) {
 626                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 627                                       pipe_name(intel_crtc->pipe),
 628                                       cur_size, fb->base.pitches[0]);
 629                         fb = NULL;
 630                         break;
 631                 }
 632
 633                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 634                 cur_size = intel_fb_align_height(dev, cur_size,
 635                                                  fb->base.pixel_format,
 636                                                  fb->base.modifier);
 637                 cur_size *= fb->base.pitches[0];
 638                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 639                               pipe_name(intel_crtc->pipe),
 640                               intel_crtc->config->base.adjusted_mode.crtc_hdisplay,
 641                               intel_crtc->config->base.adjusted_mode.crtc_vdisplay,
 642                               fb->base.bits_per_pixel,
 643                               cur_size);
 644
 645                 if (cur_size > max_size) {
 646                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 647                                       pipe_name(intel_crtc->pipe),
 648                                       cur_size, max_size);
 649                         fb = NULL;
 650                         break;
 651                 }
 652
 653                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 654                               pipe_name(intel_crtc->pipe),
 655                               max_size, cur_size);
 656         }
 657
 658         if (!fb) {
 659                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 660                 goto out;
 661         }
 662
 663         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 664         ifbdev->fb = fb;
 665
 666         drm_framebuffer_reference(&ifbdev->fb->base);
 667
 668         /* Final pass to check if any active pipes don't have fbs */
 669         for_each_crtc(dev, crtc) {
 670                 intel_crtc = to_intel_crtc(crtc);
 671
 672                 if (!crtc->state->active)
 673                         continue;
 674
 675                 WARN(!crtc->primary->fb,
 676                      "re-used BIOS config but lost an fb on crtc %d\n",
 677                      crtc->base.id);
 678         }
 679
 680
 681         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 682         return true;
 683
 684 out:
 685
 686         return false;
 687 }
 688
 689 static void intel_fbdev_suspend_worker(struct work_struct *work)
 690 {
 691         intel_fbdev_set_suspend(&container_of(work,
 692                                               struct drm_i915_private,
 693                                               fbdev_suspend_work)->drm,
 694                                 FBINFO_STATE_RUNNING,
 695                                 true);
 696 }
 697
 698 int intel_fbdev_init(struct drm_device *dev)
 699 {
 700         struct drm_i915_private *dev_priv = to_i915(dev);
 701         struct intel_fbdev *ifbdev;
 702         int ret;
 703
 704         if (WARN_ON(INTEL_INFO(dev_priv)->num_pipes == 0))
 705                 return -ENODEV;
 706
 707         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 708         if (ifbdev == NULL)
 709                 return -ENOMEM;
 710
 711         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 712
 713         if (!intel_fbdev_init_bios(dev, ifbdev))
 714                 ifbdev->preferred_bpp = 32;
 715
 716         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 717                                  INTEL_INFO(dev_priv)->num_pipes, 4);
 718         if (ret) {
 719                 kfree(ifbdev);
 720                 return ret;
 721         }
 722
 723         dev_priv->fbdev = ifbdev;
 724         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 725
 726         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 727
 728         return 0;
 729 }
 730
 731 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 732 {
 733         struct intel_fbdev *ifbdev = data;
 734
 735         /* Due to peculiar init order wrt to hpd handling this is separate. */
 736         if (drm_fb_helper_initial_config(&ifbdev->helper,
 737                                          ifbdev->preferred_bpp))
 738                 intel_fbdev_fini(ifbdev->helper.dev);
 739 }
 740
 741 void intel_fbdev_initial_config_async(struct drm_device *dev)
 742 {
 743         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 744
 745         if (!ifbdev)
 746                 return;
 747
 748         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 749 }
 750
 751 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 752 {
 753         if (!ifbdev->cookie)
 754                 return;
 755
 756         /* Only serialises with all preceding async calls, hence +1 */
 757         async_synchronize_cookie(ifbdev->cookie + 1);
 758         ifbdev->cookie = 0;
 759 }
 760
 761 void intel_fbdev_fini(struct drm_device *dev)
 762 {
 763         struct drm_i915_private *dev_priv = to_i915(dev);
 764         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 765
 766         if (!ifbdev)
 767                 return;
 768
 769         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 770         if (!current_is_async())
 771                 intel_fbdev_sync(ifbdev);
 772
 773         intel_fbdev_destroy(ifbdev);
 774         dev_priv->fbdev = NULL;
 775 }
 776
 777 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 778 {
 779         struct drm_i915_private *dev_priv = to_i915(dev);
 780         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 781         struct fb_info *info;
 782
 783         if (!ifbdev || !ifbdev->fb)
 784                 return;
 785
 786         info = ifbdev->helper.fbdev;
 787
 788         if (synchronous) {
 789                 /* Flush any pending work to turn the console on, and then
 790                  * wait to turn it off. It must be synchronous as we are
 791                  * about to suspend or unload the driver.
 792                  *
 793                  * Note that from within the work-handler, we cannot flush
 794                  * ourselves, so only flush outstanding work upon suspend!
 795                  */
 796                 if (state != FBINFO_STATE_RUNNING)
 797                         flush_work(&dev_priv->fbdev_suspend_work);
 798                 console_lock();
 799         } else {
 800                 /*
 801                  * The console lock can be pretty contented on resume due
 802                  * to all the printk activity.  Try to keep it out of the hot
 803                  * path of resume if possible.
 804                  */
 805                 WARN_ON(state != FBINFO_STATE_RUNNING);
 806                 if (!console_trylock()) {
 807                         /* Don't block our own workqueue as this can
 808                          * be run in parallel with other i915.ko tasks.
 809                          */
 810                         schedule_work(&dev_priv->fbdev_suspend_work);
 811                         return;
 812                 }
 813         }
 814
 815         /* On resume from hibernation: If the object is shmemfs backed, it has
 816          * been restored from swap. If the object is stolen however, it will be
 817          * full of whatever garbage was left in there.
 818          */
 819         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 820                 memset_io(info->screen_base, 0, info->screen_size);
 821
 822         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 823         console_unlock();
 824 }
 825
 826 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 827 {
 828         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 829
 830         if (ifbdev && ifbdev->fb)
 831                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 832 }
 833
 834 void intel_fbdev_restore_mode(struct drm_device *dev)
 835 {
 836         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 837
 838         if (!ifbdev)
 839                 return;
 840
 841         intel_fbdev_sync(ifbdev);
 842         if (!ifbdev->fb)
 843                 return;
 844
 845         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper)) {
 846                 DRM_DEBUG("failed to restore crtc mode\n");
 847         } else {
 848                 mutex_lock(&dev->struct_mutex);
 849                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 850                 mutex_unlock(&dev->struct_mutex);
 851         }
 852 }