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