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 "intel_frontbuffer.h"
  46 #include <drm/i915_drm.h>
  47 #include "i915_drv.h"
  48
  49 static int intel_fbdev_set_par(struct fb_info *info)
  50 {
  51         struct drm_fb_helper *fb_helper = info->par;
  52         struct intel_fbdev *ifbdev =
  53                 container_of(fb_helper, struct intel_fbdev, helper);
  54         int ret;
  55
  56         ret = drm_fb_helper_set_par(info);
  57
  58         if (ret == 0) {
  59                 mutex_lock(&fb_helper->dev->struct_mutex);
  60                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  61                 mutex_unlock(&fb_helper->dev->struct_mutex);
  62         }
  63
  64         return ret;
  65 }
  66
  67 static int intel_fbdev_blank(int blank, struct fb_info *info)
  68 {
  69         struct drm_fb_helper *fb_helper = info->par;
  70         struct intel_fbdev *ifbdev =
  71                 container_of(fb_helper, struct intel_fbdev, helper);
  72         int ret;
  73
  74         ret = drm_fb_helper_blank(blank, info);
  75
  76         if (ret == 0) {
  77                 mutex_lock(&fb_helper->dev->struct_mutex);
  78                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  79                 mutex_unlock(&fb_helper->dev->struct_mutex);
  80         }
  81
  82         return ret;
  83 }
  84
  85 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  86                                    struct fb_info *info)
  87 {
  88         struct drm_fb_helper *fb_helper = info->par;
  89         struct intel_fbdev *ifbdev =
  90                 container_of(fb_helper, struct intel_fbdev, helper);
  91
  92         int ret;
  93         ret = drm_fb_helper_pan_display(var, info);
  94
  95         if (ret == 0) {
  96                 mutex_lock(&fb_helper->dev->struct_mutex);
  97                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  98                 mutex_unlock(&fb_helper->dev->struct_mutex);
  99         }
 100
 101         return ret;
 102 }
 103
 104 static struct fb_ops intelfb_ops = {
 105         .owner = THIS_MODULE,
 106         .fb_check_var = drm_fb_helper_check_var,
 107         .fb_set_par = intel_fbdev_set_par,
 108         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 109         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 110         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 111         .fb_pan_display = intel_fbdev_pan_display,
 112         .fb_blank = intel_fbdev_blank,
 113         .fb_setcmap = drm_fb_helper_setcmap,
 114         .fb_debug_enter = drm_fb_helper_debug_enter,
 115         .fb_debug_leave = drm_fb_helper_debug_leave,
 116 };
 117
 118 static int intelfb_alloc(struct drm_fb_helper *helper,
 119                          struct drm_fb_helper_surface_size *sizes)
 120 {
 121         struct intel_fbdev *ifbdev =
 122                 container_of(helper, struct intel_fbdev, helper);
 123         struct drm_framebuffer *fb;
 124         struct drm_device *dev = helper->dev;
 125         struct drm_i915_private *dev_priv = to_i915(dev);
 126         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 127         struct drm_mode_fb_cmd2 mode_cmd = {};
 128         struct drm_i915_gem_object *obj = NULL;
 129         int size, ret;
 130
 131         /* we don't do packed 24bpp */
 132         if (sizes->surface_bpp == 24)
 133                 sizes->surface_bpp = 32;
 134
 135         mode_cmd.width = sizes->surface_width;
 136         mode_cmd.height = sizes->surface_height;
 137
 138         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 139                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 140         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 141                                                           sizes->surface_depth);
 142
 143         mutex_lock(&dev->struct_mutex);
 144
 145         size = mode_cmd.pitches[0] * mode_cmd.height;
 146         size = PAGE_ALIGN(size);
 147
 148         /* If the FB is too big, just don't use it since fbdev is not very
 149          * important and we should probably use that space with FBC or other
 150          * features. */
 151         if (size * 2 < ggtt->stolen_usable_size)
 152                 obj = i915_gem_object_create_stolen(dev, size);
 153         if (obj == NULL)
 154                 obj = i915_gem_object_create(dev, size);
 155         if (IS_ERR(obj)) {
 156                 DRM_ERROR("failed to allocate framebuffer\n");
 157                 ret = PTR_ERR(obj);
 158                 goto out;
 159         }
 160
 161         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 162         if (IS_ERR(fb)) {
 163                 i915_gem_object_put(obj);
 164                 ret = PTR_ERR(fb);
 165                 goto out;
 166         }
 167
 168         mutex_unlock(&dev->struct_mutex);
 169
 170         ifbdev->fb = to_intel_framebuffer(fb);
 171
 172         return 0;
 173
 174 out:
 175         mutex_unlock(&dev->struct_mutex);
 176         return ret;
 177 }
 178
 179 static int intelfb_create(struct drm_fb_helper *helper,
 180                           struct drm_fb_helper_surface_size *sizes)
 181 {
 182         struct intel_fbdev *ifbdev =
 183                 container_of(helper, struct intel_fbdev, helper);
 184         struct intel_framebuffer *intel_fb = ifbdev->fb;
 185         struct drm_device *dev = helper->dev;
 186         struct drm_i915_private *dev_priv = to_i915(dev);
 187         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 188         struct fb_info *info;
 189         struct drm_framebuffer *fb;
 190         struct i915_vma *vma;
 191         struct drm_i915_gem_object *obj;
 192         bool prealloc = false;
 193         void __iomem *vaddr;
 194         int ret;
 195
 196         if (intel_fb &&
 197             (sizes->fb_width > intel_fb->base.width ||
 198              sizes->fb_height > intel_fb->base.height)) {
 199                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 200                               " releasing it\n",
 201                               intel_fb->base.width, intel_fb->base.height,
 202                               sizes->fb_width, sizes->fb_height);
 203                 drm_framebuffer_unreference(&intel_fb->base);
 204                 intel_fb = ifbdev->fb = NULL;
 205         }
 206         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 207                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 208                 ret = intelfb_alloc(helper, sizes);
 209                 if (ret)
 210                         return ret;
 211                 intel_fb = ifbdev->fb;
 212         } else {
 213                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 214                 prealloc = true;
 215                 sizes->fb_width = intel_fb->base.width;
 216                 sizes->fb_height = intel_fb->base.height;
 217         }
 218
 219         obj = intel_fb->obj;
 220
 221         mutex_lock(&dev->struct_mutex);
 222
 223         /* Pin the GGTT vma for our access via info->screen_base.
 224          * This also validates that any existing fb inherited from the
 225          * BIOS is suitable for own access.
 226          */
 227         ret = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, BIT(DRM_ROTATE_0));
 228         if (ret)
 229                 goto out_unlock;
 230
 231         info = drm_fb_helper_alloc_fbi(helper);
 232         if (IS_ERR(info)) {
 233                 DRM_ERROR("Failed to allocate fb_info\n");
 234                 ret = PTR_ERR(info);
 235                 goto out_unpin;
 236         }
 237
 238         info->par = helper;
 239
 240         fb = &ifbdev->fb->base;
 241
 242         ifbdev->helper.fb = fb;
 243
 244         strcpy(info->fix.id, "inteldrmfb");
 245
 246         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 247         info->fbops = &intelfb_ops;
 248
 249         vma = i915_gem_obj_to_ggtt(obj);
 250
 251         /* setup aperture base/size for vesafb takeover */
 252         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 253         info->apertures->ranges[0].size = ggtt->mappable_end;
 254
 255         info->fix.smem_start = dev->mode_config.fb_base + vma->node.start;
 256         info->fix.smem_len = vma->node.size;
 257
 258         vaddr = i915_vma_pin_iomap(vma);
 259         if (IS_ERR(vaddr)) {
 260                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 261                 ret = PTR_ERR(vaddr);
 262                 goto out_destroy_fbi;
 263         }
 264         info->screen_base = vaddr;
 265         info->screen_size = vma->node.size;
 266
 267         /* This driver doesn't need a VT switch to restore the mode on resume */
 268         info->skip_vt_switch = true;
 269
 270         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 271         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 272
 273         /* If the object is shmemfs backed, it will have given us zeroed pages.
 274          * If the object is stolen however, it will be full of whatever
 275          * garbage was left in there.
 276          */
 277         if (ifbdev->fb->obj->stolen && !prealloc)
 278                 memset_io(info->screen_base, 0, info->screen_size);
 279
 280         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 281
 282         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08llx, bo %p\n",
 283                       fb->width, fb->height,
 284                       i915_gem_obj_ggtt_offset(obj), obj);
 285
 286         mutex_unlock(&dev->struct_mutex);
 287         vga_switcheroo_client_fb_set(dev->pdev, info);
 288         return 0;
 289
 290 out_destroy_fbi:
 291         drm_fb_helper_release_fbi(helper);
 292 out_unpin:
 293         intel_unpin_fb_obj(&ifbdev->fb->base, BIT(DRM_ROTATE_0));
 294 out_unlock:
 295         mutex_unlock(&dev->struct_mutex);
 296         return ret;
 297 }
 298
 299 /** Sets the color ramps on behalf of RandR */
 300 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 301                                     u16 blue, int regno)
 302 {
 303         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 304
 305         intel_crtc->lut_r[regno] = red >> 8;
 306         intel_crtc->lut_g[regno] = green >> 8;
 307         intel_crtc->lut_b[regno] = blue >> 8;
 308 }
 309
 310 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 311                                     u16 *blue, int regno)
 312 {
 313         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 314
 315         *red = intel_crtc->lut_r[regno] << 8;
 316         *green = intel_crtc->lut_g[regno] << 8;
 317         *blue = intel_crtc->lut_b[regno] << 8;
 318 }
 319
 320 static struct drm_fb_helper_crtc *
 321 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 322 {
 323         int i;
 324
 325         for (i = 0; i < fb_helper->crtc_count; i++)
 326                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 327                         return &fb_helper->crtc_info[i];
 328
 329         return NULL;
 330 }
 331
 332 /*
 333  * Try to read the BIOS display configuration and use it for the initial
 334  * fb configuration.
 335  *
 336  * The BIOS or boot loader will generally create an initial display
 337  * configuration for us that includes some set of active pipes and displays.
 338  * This routine tries to figure out which pipes and connectors are active
 339  * and stuffs them into the crtcs and modes array given to us by the
 340  * drm_fb_helper code.
 341  *
 342  * The overall sequence is:
 343  *   intel_fbdev_init - from driver load
 344  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 345  *     drm_fb_helper_init - build fb helper structs
 346  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 347  *   intel_fbdev_initial_config - apply the config
 348  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 349  *         drm_setup_crtcs - build crtc config for fbdev
 350  *           intel_fb_initial_config - find active connectors etc
 351  *         drm_fb_helper_single_fb_probe - set up fbdev
 352  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 353  *
 354  * Note that we don't make special consideration whether we could actually
 355  * switch to the selected modes without a full modeset. E.g. when the display
 356  * is in VGA mode we need to recalculate watermarks and set a new high-res
 357  * framebuffer anyway.
 358  */
 359 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 360                                     struct drm_fb_helper_crtc **crtcs,
 361                                     struct drm_display_mode **modes,
 362                                     struct drm_fb_offset *offsets,
 363                                     bool *enabled, int width, int height)
 364 {
 365         struct drm_device *dev = fb_helper->dev;
 366         unsigned long conn_configured, mask;
 367         unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG);
 368         int i, j;
 369         bool *save_enabled;
 370         bool fallback = true;
 371         int num_connectors_enabled = 0;
 372         int num_connectors_detected = 0;
 373         int pass = 0;
 374
 375         save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
 376         if (!save_enabled)
 377                 return false;
 378
 379         memcpy(save_enabled, enabled, count);
 380         mask = BIT(count) - 1;
 381         conn_configured = 0;
 382 retry:
 383         for (i = 0; i < count; i++) {
 384                 struct drm_fb_helper_connector *fb_conn;
 385                 struct drm_connector *connector;
 386                 struct drm_encoder *encoder;
 387                 struct drm_fb_helper_crtc *new_crtc;
 388                 struct intel_crtc *intel_crtc;
 389
 390                 fb_conn = fb_helper->connector_info[i];
 391                 connector = fb_conn->connector;
 392
 393                 if (conn_configured & BIT(i))
 394                         continue;
 395
 396                 if (pass == 0 && !connector->has_tile)
 397                         continue;
 398
 399                 if (connector->status == connector_status_connected)
 400                         num_connectors_detected++;
 401
 402                 if (!enabled[i]) {
 403                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 404                                       connector->name);
 405                         conn_configured |= BIT(i);
 406                         continue;
 407                 }
 408
 409                 if (connector->force == DRM_FORCE_OFF) {
 410                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 411                                       connector->name);
 412                         enabled[i] = false;
 413                         continue;
 414                 }
 415
 416                 encoder = connector->state->best_encoder;
 417                 if (!encoder || WARN_ON(!connector->state->crtc)) {
 418                         if (connector->force > DRM_FORCE_OFF)
 419                                 goto bail;
 420
 421                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 422                                       connector->name);
 423                         enabled[i] = false;
 424                         conn_configured |= BIT(i);
 425                         continue;
 426                 }
 427
 428                 num_connectors_enabled++;
 429
 430                 intel_crtc = to_intel_crtc(connector->state->crtc);
 431                 for (j = 0; j < 256; j++) {
 432                         intel_crtc->lut_r[j] = j;
 433                         intel_crtc->lut_g[j] = j;
 434                         intel_crtc->lut_b[j] = j;
 435                 }
 436
 437                 new_crtc = intel_fb_helper_crtc(fb_helper,
 438                                                 connector->state->crtc);
 439
 440                 /*
 441                  * Make sure we're not trying to drive multiple connectors
 442                  * with a single CRTC, since our cloning support may not
 443                  * match the BIOS.
 444                  */
 445                 for (j = 0; j < count; j++) {
 446                         if (crtcs[j] == new_crtc) {
 447                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 448                                 goto bail;
 449                         }
 450                 }
 451
 452                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 453                               connector->name);
 454
 455                 /* go for command line mode first */
 456                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 457
 458                 /* try for preferred next */
 459                 if (!modes[i]) {
 460                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 461                                       connector->name, connector->has_tile);
 462                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 463                                                           height);
 464                 }
 465
 466                 /* No preferred mode marked by the EDID? Are there any modes? */
 467                 if (!modes[i] && !list_empty(&connector->modes)) {
 468                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 469                                       connector->name);
 470                         modes[i] = list_first_entry(&connector->modes,
 471                                                     struct drm_display_mode,
 472                                                     head);
 473                 }
 474
 475                 /* last resort: use current mode */
 476                 if (!modes[i]) {
 477                         /*
 478                          * IMPORTANT: We want to use the adjusted mode (i.e.
 479                          * after the panel fitter upscaling) as the initial
 480                          * config, not the input mode, which is what crtc->mode
 481                          * usually contains. But since our current
 482                          * code puts a mode derived from the post-pfit timings
 483                          * into crtc->mode this works out correctly.
 484                          *
 485                          * This is crtc->mode and not crtc->state->mode for the
 486                          * fastboot check to work correctly. crtc_state->mode has
 487                          * I915_MODE_FLAG_INHERITED, which we clear to force check
 488                          * state.
 489                          */
 490                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 491                                       connector->name);
 492                         modes[i] = &connector->state->crtc->mode;
 493                 }
 494                 crtcs[i] = new_crtc;
 495
 496                 DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
 497                               connector->name,
 498                               connector->state->crtc->base.id,
 499                               connector->state->crtc->name,
 500                               modes[i]->hdisplay, modes[i]->vdisplay,
 501                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 502
 503                 fallback = false;
 504                 conn_configured |= BIT(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, count);
 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 intel_fbdev *ifbdev)
 545 {
 546         /* We rely on the object-free to release the VMA pinning for
 547          * the info->screen_base mmaping. Leaking the VMA is simpler than
 548          * trying to rectify all the possible error paths leading here.
 549          */
 550
 551         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 552         drm_fb_helper_release_fbi(&ifbdev->helper);
 553
 554         drm_fb_helper_fini(&ifbdev->helper);
 555
 556         if (ifbdev->fb) {
 557                 mutex_lock(&ifbdev->helper.dev->struct_mutex);
 558                 intel_unpin_fb_obj(&ifbdev->fb->base, BIT(DRM_ROTATE_0));
 559                 mutex_unlock(&ifbdev->helper.dev->struct_mutex);
 560
 561                 drm_framebuffer_remove(&ifbdev->fb->base);
 562         }
 563
 564         kfree(ifbdev);
 565 }
 566
 567 /*
 568  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 569  * The core display code will have read out the current plane configuration,
 570  * so we use that to figure out if there's an object for us to use as the
 571  * fb, and if so, we re-use it for the fbdev configuration.
 572  *
 573  * Note we only support a single fb shared across pipes for boot (mostly for
 574  * fbcon), so we just find the biggest and use that.
 575  */
 576 static bool intel_fbdev_init_bios(struct drm_device *dev,
 577                                  struct intel_fbdev *ifbdev)
 578 {
 579         struct intel_framebuffer *fb = NULL;
 580         struct drm_crtc *crtc;
 581         struct intel_crtc *intel_crtc;
 582         unsigned int max_size = 0;
 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 (!crtc->state->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 (!crtc->state->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 (!crtc->state->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)->drm,
 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 = to_i915(dev);
 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 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 738 {
 739         struct intel_fbdev *ifbdev = data;
 740
 741         /* Due to peculiar init order wrt to hpd handling this is separate. */
 742         if (drm_fb_helper_initial_config(&ifbdev->helper,
 743                                          ifbdev->preferred_bpp))
 744                 intel_fbdev_fini(ifbdev->helper.dev);
 745 }
 746
 747 void intel_fbdev_initial_config_async(struct drm_device *dev)
 748 {
 749         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 750
 751         ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 752 }
 753
 754 static void intel_fbdev_sync(struct intel_fbdev *ifbdev)
 755 {
 756         if (!ifbdev->cookie)
 757                 return;
 758
 759         /* Only serialises with all preceding async calls, hence +1 */
 760         async_synchronize_cookie(ifbdev->cookie + 1);
 761         ifbdev->cookie = 0;
 762 }
 763
 764 void intel_fbdev_fini(struct drm_device *dev)
 765 {
 766         struct drm_i915_private *dev_priv = to_i915(dev);
 767         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 768
 769         if (!ifbdev)
 770                 return;
 771
 772         cancel_work_sync(&dev_priv->fbdev_suspend_work);
 773         if (!current_is_async())
 774                 intel_fbdev_sync(ifbdev);
 775
 776         intel_fbdev_destroy(ifbdev);
 777         dev_priv->fbdev = NULL;
 778 }
 779
 780 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 781 {
 782         struct drm_i915_private *dev_priv = to_i915(dev);
 783         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 784         struct fb_info *info;
 785
 786         if (!ifbdev || !ifbdev->fb)
 787                 return;
 788
 789         info = ifbdev->helper.fbdev;
 790
 791         if (synchronous) {
 792                 /* Flush any pending work to turn the console on, and then
 793                  * wait to turn it off. It must be synchronous as we are
 794                  * about to suspend or unload the driver.
 795                  *
 796                  * Note that from within the work-handler, we cannot flush
 797                  * ourselves, so only flush outstanding work upon suspend!
 798                  */
 799                 if (state != FBINFO_STATE_RUNNING)
 800                         flush_work(&dev_priv->fbdev_suspend_work);
 801                 console_lock();
 802         } else {
 803                 /*
 804                  * The console lock can be pretty contented on resume due
 805                  * to all the printk activity.  Try to keep it out of the hot
 806                  * path of resume if possible.
 807                  */
 808                 WARN_ON(state != FBINFO_STATE_RUNNING);
 809                 if (!console_trylock()) {
 810                         /* Don't block our own workqueue as this can
 811                          * be run in parallel with other i915.ko tasks.
 812                          */
 813                         schedule_work(&dev_priv->fbdev_suspend_work);
 814                         return;
 815                 }
 816         }
 817
 818         /* On resume from hibernation: If the object is shmemfs backed, it has
 819          * been restored from swap. If the object is stolen however, it will be
 820          * full of whatever garbage was left in there.
 821          */
 822         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 823                 memset_io(info->screen_base, 0, info->screen_size);
 824
 825         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 826         console_unlock();
 827 }
 828
 829 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 830 {
 831         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 832
 833         if (ifbdev && ifbdev->fb)
 834                 drm_fb_helper_hotplug_event(&ifbdev->helper);
 835 }
 836
 837 void intel_fbdev_restore_mode(struct drm_device *dev)
 838 {
 839         struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 840
 841         if (!ifbdev)
 842                 return;
 843
 844         intel_fbdev_sync(ifbdev);
 845         if (!ifbdev->fb)
 846                 return;
 847
 848         if (drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper)) {
 849                 DRM_DEBUG("failed to restore crtc mode\n");
 850         } else {
 851                 mutex_lock(&dev->struct_mutex);
 852                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 853                 mutex_unlock(&dev->struct_mutex);
 854         }
 855 }