sys/dev/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 <drm/drmP.h>
  28 #include <linux/async.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/console.h>
  32 #include <linux/errno.h>
  33 #include <linux/string.h>
  34 #include <linux/mm.h>
  35 #include <linux/delay.h>
  36 #include <linux/fb.h>
  37 #include <linux/vga_switcheroo.h>
  38
  39 #include <drm/drmP.h>
  40 #include <drm/drm_crtc.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include "intel_drv.h"
  43 #include <drm/i915_drm.h>
  44 #include "i915_drv.h"
  45
  46 static int intel_fbdev_set_par(struct fb_info *info)
  47 {
  48         struct drm_fb_helper *fb_helper = info->par;
  49         struct intel_fbdev *ifbdev =
  50                 container_of(fb_helper, struct intel_fbdev, helper);
  51         int ret;
  52
  53         ret = drm_fb_helper_set_par(info);
  54
  55         if (ret == 0) {
  56                 mutex_lock(&fb_helper->dev->struct_mutex);
  57                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  58                 mutex_unlock(&fb_helper->dev->struct_mutex);
  59         }
  60
  61         return ret;
  62 }
  63
  64 static int intel_fbdev_blank(int blank, struct fb_info *info)
  65 {
  66         struct drm_fb_helper *fb_helper = info->par;
  67         struct intel_fbdev *ifbdev =
  68                 container_of(fb_helper, struct intel_fbdev, helper);
  69         int ret;
  70
  71         ret = drm_fb_helper_blank(blank, info);
  72
  73         if (ret == 0) {
  74                 mutex_lock(&fb_helper->dev->struct_mutex);
  75                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  76                 mutex_unlock(&fb_helper->dev->struct_mutex);
  77         }
  78
  79         return ret;
  80 }
  81
  82 #if 0
  83 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  84                                    struct fb_info *info)
  85 {
  86         struct drm_fb_helper *fb_helper = info->par;
  87         struct intel_fbdev *ifbdev =
  88                 container_of(fb_helper, struct intel_fbdev, helper);
  89
  90         int ret;
  91         ret = drm_fb_helper_pan_display(var, info);
  92
  93         if (ret == 0) {
  94                 mutex_lock(&fb_helper->dev->struct_mutex);
  95                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
  96                 mutex_unlock(&fb_helper->dev->struct_mutex);
  97         }
  98
  99         return ret;
 100 }
 101 #endif
 102
 103 static struct fb_ops intelfb_ops = {
 104 #if 0
 105         .owner = THIS_MODULE,
 106         .fb_check_var = drm_fb_helper_check_var,
 107 #endif
 108         .fb_set_par = intel_fbdev_set_par,
 109 #if 0
 110         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 111         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 112         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 113         .fb_pan_display = intel_fbdev_pan_display,
 114 #endif
 115         .fb_blank = intel_fbdev_blank,
 116 #if 0
 117         .fb_setcmap = drm_fb_helper_setcmap,
 118 #endif
 119         .fb_debug_enter = drm_fb_helper_debug_enter,
 120 #if 0
 121         .fb_debug_leave = drm_fb_helper_debug_leave,
 122 #endif
 123 };
 124
 125 static int intelfb_alloc(struct drm_fb_helper *helper,
 126                          struct drm_fb_helper_surface_size *sizes)
 127 {
 128         struct intel_fbdev *ifbdev =
 129                 container_of(helper, struct intel_fbdev, helper);
 130         struct drm_framebuffer *fb;
 131         struct drm_device *dev = helper->dev;
 132         struct drm_i915_private *dev_priv = to_i915(dev);
 133         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 134         struct drm_mode_fb_cmd2 mode_cmd = {};
 135         struct drm_i915_gem_object *obj = NULL;
 136         int size, ret;
 137
 138         /* we don't do packed 24bpp */
 139         if (sizes->surface_bpp == 24)
 140                 sizes->surface_bpp = 32;
 141
 142         mode_cmd.width = sizes->surface_width;
 143         mode_cmd.height = sizes->surface_height;
 144
 145         mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
 146                                     DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
 147         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 148                                                           sizes->surface_depth);
 149
 150         mutex_lock(&dev->struct_mutex);
 151
 152         size = mode_cmd.pitches[0] * mode_cmd.height;
 153         size = PAGE_ALIGN(size);
 154
 155         /* If the FB is too big, just don't use it since fbdev is not very
 156          * important and we should probably use that space with FBC or other
 157          * features. */
 158         if (size * 2 < ggtt->stolen_usable_size)
 159                 obj = i915_gem_object_create_stolen(dev, size);
 160         if (obj == NULL)
 161                 obj = i915_gem_alloc_object(dev, size);
 162         if (!obj) {
 163                 DRM_ERROR("failed to allocate framebuffer\n");
 164                 ret = -ENOMEM;
 165                 goto out;
 166         }
 167
 168         fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
 169         if (IS_ERR(fb)) {
 170                 drm_gem_object_unreference(&obj->base);
 171                 ret = PTR_ERR(fb);
 172                 goto out;
 173         }
 174
 175         mutex_unlock(&dev->struct_mutex);
 176
 177         ifbdev->fb = to_intel_framebuffer(fb);
 178
 179         return 0;
 180
 181 out:
 182         mutex_unlock(&dev->struct_mutex);
 183         return ret;
 184 }
 185
 186 static int intelfb_create(struct drm_fb_helper *helper,
 187                           struct drm_fb_helper_surface_size *sizes)
 188 {
 189         struct intel_fbdev *ifbdev =
 190                 container_of(helper, struct intel_fbdev, helper);
 191         struct intel_framebuffer *intel_fb = ifbdev->fb;
 192         struct drm_device *dev = helper->dev;
 193         struct drm_i915_private *dev_priv = to_i915(dev);
 194         struct fb_info *info;
 195         struct drm_framebuffer *fb;
 196         struct drm_i915_gem_object *obj;
 197         device_t vga_dev;
 198         int size, ret;
 199         bool prealloc = false;
 200
 201         if (intel_fb &&
 202             (sizes->fb_width > intel_fb->base.width ||
 203              sizes->fb_height > intel_fb->base.height)) {
 204                 DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"
 205                               " releasing it\n",
 206                               intel_fb->base.width, intel_fb->base.height,
 207                               sizes->fb_width, sizes->fb_height);
 208                 drm_framebuffer_unreference(&intel_fb->base);
 209                 intel_fb = ifbdev->fb = NULL;
 210         }
 211         if (!intel_fb || WARN_ON(!intel_fb->obj)) {
 212                 DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
 213                 ret = intelfb_alloc(helper, sizes);
 214                 if (ret)
 215                         return ret;
 216                 intel_fb = ifbdev->fb;
 217         } else {
 218                 DRM_DEBUG_KMS("re-using BIOS fb\n");
 219                 prealloc = true;
 220                 sizes->fb_width = intel_fb->base.width;
 221                 sizes->fb_height = intel_fb->base.height;
 222         }
 223
 224         obj = intel_fb->obj;
 225         size = obj->base.size;
 226
 227         mutex_lock(&dev->struct_mutex);
 228
 229         /* Pin the GGTT vma for our access via info->screen_base.
 230          * This also validates that any existing fb inherited from the
 231          * BIOS is suitable for own access.
 232          */
 233         ret = intel_pin_and_fence_fb_obj(&ifbdev->fb->base, BIT(DRM_ROTATE_0));
 234         if (ret)
 235                 goto out_unlock;
 236
 237         info = drm_fb_helper_alloc_fbi(helper);
 238         if (IS_ERR(info)) {
 239                 DRM_ERROR("Failed to allocate fb_info\n");
 240                 ret = PTR_ERR(info);
 241                 goto out_unpin;
 242         }
 243
 244         info->par = helper;
 245
 246         fb = &ifbdev->fb->base;
 247
 248         ifbdev->helper.fb = fb;
 249
 250 #ifdef __DragonFly__
 251         vga_dev = device_get_parent(dev->dev->bsddev);
 252         info->width = sizes->fb_width;
 253         info->height = sizes->fb_height;
 254         info->stride = fb->pitches[0];
 255         info->depth = sizes->surface_bpp;
 256         info->paddr = dev_priv->ggtt.mappable_base + i915_gem_obj_ggtt_offset(obj);
 257         info->is_vga_boot_display = vga_pci_is_boot_display(vga_dev);
 258         info->vaddr = (vm_offset_t)pmap_mapdev_attr(info->paddr, size,
 259                 VM_MEMATTR_WRITE_COMBINING);
 260         info->fbops = intelfb_ops;
 261 #else
 262         strcpy(info->fix.id, "inteldrmfb");
 263
 264         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 265         info->fbops = &intelfb_ops;
 266
 267         /* setup aperture base/size for vesafb takeover */
 268         info->apertures->ranges[0].base = dev->mode_config.fb_base;
 269         info->apertures->ranges[0].size = ggtt->mappable_end;
 270
 271         info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
 272         info->fix.smem_len = size;
 273
 274         info->screen_base =
 275                 ioremap_wc(ggtt->mappable_base + i915_gem_obj_ggtt_offset(obj),
 276                            size);
 277         if (!info->screen_base) {
 278                 DRM_ERROR("Failed to remap framebuffer into virtual memory\n");
 279                 ret = -ENOSPC;
 280                 goto out_destroy_fbi;
 281         }
 282         info->screen_size = size;
 283
 284         /* This driver doesn't need a VT switch to restore the mode on resume */
 285         info->skip_vt_switch = true;
 286
 287         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 288         drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
 289
 290         /* If the object is shmemfs backed, it will have given us zeroed pages.
 291          * If the object is stolen however, it will be full of whatever
 292          * garbage was left in there.
 293          */
 294         if (ifbdev->fb->obj->stolen && !prealloc)
 295                 memset_io(info->screen_base, 0, info->screen_size);
 296
 297         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 298 #endif
 299
 300         DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08llx, bo %p\n",
 301                       fb->width, fb->height,
 302                       i915_gem_obj_ggtt_offset(obj), obj);
 303
 304         mutex_unlock(&dev->struct_mutex);
 305 #if 0
 306         vga_switcheroo_client_fb_set(dev->pdev, info);
 307 #endif
 308         return 0;
 309
 310 #if 0
 311 out_destroy_fbi:
 312         drm_fb_helper_release_fbi(helper);
 313 #endif
 314 out_unpin:
 315         i915_gem_object_ggtt_unpin(obj);
 316 out_unlock:
 317         mutex_unlock(&dev->struct_mutex);
 318         return ret;
 319 }
 320
 321 /** Sets the color ramps on behalf of RandR */
 322 static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 323                                     u16 blue, int regno)
 324 {
 325         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 326
 327         intel_crtc->lut_r[regno] = red >> 8;
 328         intel_crtc->lut_g[regno] = green >> 8;
 329         intel_crtc->lut_b[regno] = blue >> 8;
 330 }
 331
 332 static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 333                                     u16 *blue, int regno)
 334 {
 335         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 336
 337         *red = intel_crtc->lut_r[regno] << 8;
 338         *green = intel_crtc->lut_g[regno] << 8;
 339         *blue = intel_crtc->lut_b[regno] << 8;
 340 }
 341
 342 static struct drm_fb_helper_crtc *
 343 intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)
 344 {
 345         int i;
 346
 347         for (i = 0; i < fb_helper->crtc_count; i++)
 348                 if (fb_helper->crtc_info[i].mode_set.crtc == crtc)
 349                         return &fb_helper->crtc_info[i];
 350
 351         return NULL;
 352 }
 353
 354 /*
 355  * Try to read the BIOS display configuration and use it for the initial
 356  * fb configuration.
 357  *
 358  * The BIOS or boot loader will generally create an initial display
 359  * configuration for us that includes some set of active pipes and displays.
 360  * This routine tries to figure out which pipes and connectors are active
 361  * and stuffs them into the crtcs and modes array given to us by the
 362  * drm_fb_helper code.
 363  *
 364  * The overall sequence is:
 365  *   intel_fbdev_init - from driver load
 366  *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data
 367  *     drm_fb_helper_init - build fb helper structs
 368  *     drm_fb_helper_single_add_all_connectors - more fb helper structs
 369  *   intel_fbdev_initial_config - apply the config
 370  *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()
 371  *         drm_setup_crtcs - build crtc config for fbdev
 372  *           intel_fb_initial_config - find active connectors etc
 373  *         drm_fb_helper_single_fb_probe - set up fbdev
 374  *           intelfb_create - re-use or alloc fb, build out fbdev structs
 375  *
 376  * Note that we don't make special consideration whether we could actually
 377  * switch to the selected modes without a full modeset. E.g. when the display
 378  * is in VGA mode we need to recalculate watermarks and set a new high-res
 379  * framebuffer anyway.
 380  */
 381 static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
 382                                     struct drm_fb_helper_crtc **crtcs,
 383                                     struct drm_display_mode **modes,
 384                                     struct drm_fb_offset *offsets,
 385                                     bool *enabled, int width, int height)
 386 {
 387         struct drm_device *dev = fb_helper->dev;
 388         int i, j;
 389         bool *save_enabled;
 390         bool fallback = true;
 391         int num_connectors_enabled = 0;
 392         int num_connectors_detected = 0;
 393         uint64_t conn_configured = 0, mask;
 394         int pass = 0;
 395
 396         save_enabled = kcalloc(fb_helper->connector_count, sizeof(bool),
 397                                GFP_KERNEL);
 398         if (!save_enabled)
 399                 return false;
 400
 401         memcpy(save_enabled, enabled, fb_helper->connector_count);
 402         mask = (1 << fb_helper->connector_count) - 1;
 403 retry:
 404         for (i = 0; i < fb_helper->connector_count; i++) {
 405                 struct drm_fb_helper_connector *fb_conn;
 406                 struct drm_connector *connector;
 407                 struct drm_encoder *encoder;
 408                 struct drm_fb_helper_crtc *new_crtc;
 409                 struct intel_crtc *intel_crtc;
 410
 411                 fb_conn = fb_helper->connector_info[i];
 412                 connector = fb_conn->connector;
 413
 414                 if (conn_configured & (1 << i))
 415                         continue;
 416
 417                 if (pass == 0 && !connector->has_tile)
 418                         continue;
 419
 420                 if (connector->status == connector_status_connected)
 421                         num_connectors_detected++;
 422
 423                 if (!enabled[i]) {
 424                         DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
 425                                       connector->name);
 426                         conn_configured |= (1 << i);
 427                         continue;
 428                 }
 429
 430                 if (connector->force == DRM_FORCE_OFF) {
 431                         DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
 432                                       connector->name);
 433                         enabled[i] = false;
 434                         continue;
 435                 }
 436
 437                 encoder = connector->state->best_encoder;
 438                 if (!encoder || WARN_ON(!connector->state->crtc)) {
 439                         if (connector->force > DRM_FORCE_OFF)
 440                                 goto bail;
 441
 442                         DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
 443                                       connector->name);
 444                         enabled[i] = false;
 445                         conn_configured |= (1 << i);
 446                         continue;
 447                 }
 448
 449                 num_connectors_enabled++;
 450
 451                 intel_crtc = to_intel_crtc(connector->state->crtc);
 452                 for (j = 0; j < 256; j++) {
 453                         intel_crtc->lut_r[j] = j;
 454                         intel_crtc->lut_g[j] = j;
 455                         intel_crtc->lut_b[j] = j;
 456                 }
 457
 458                 new_crtc = intel_fb_helper_crtc(fb_helper, connector->state->crtc);
 459
 460                 /*
 461                  * Make sure we're not trying to drive multiple connectors
 462                  * with a single CRTC, since our cloning support may not
 463                  * match the BIOS.
 464                  */
 465                 for (j = 0; j < fb_helper->connector_count; j++) {
 466                         if (crtcs[j] == new_crtc) {
 467                                 DRM_DEBUG_KMS("fallback: cloned configuration\n");
 468                                 goto bail;
 469                         }
 470                 }
 471
 472                 DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
 473                               connector->name);
 474
 475                 /* go for command line mode first */
 476                 modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);
 477
 478                 /* try for preferred next */
 479                 if (!modes[i]) {
 480                         DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
 481                                       connector->name, connector->has_tile);
 482                         modes[i] = drm_has_preferred_mode(fb_conn, width,
 483                                                           height);
 484                 }
 485
 486                 /* No preferred mode marked by the EDID? Are there any modes? */
 487                 if (!modes[i] && !list_empty(&connector->modes)) {
 488                         DRM_DEBUG_KMS("using first mode listed on connector %s\n",
 489                                       connector->name);
 490                         modes[i] = list_first_entry(&connector->modes,
 491                                                     struct drm_display_mode,
 492                                                     head);
 493                 }
 494
 495                 /* last resort: use current mode */
 496                 if (!modes[i]) {
 497                         /*
 498                          * IMPORTANT: We want to use the adjusted mode (i.e.
 499                          * after the panel fitter upscaling) as the initial
 500                          * config, not the input mode, which is what crtc->mode
 501                          * usually contains. But since our current
 502                          * code puts a mode derived from the post-pfit timings
 503                          * into crtc->mode this works out correctly.
 504                          *
 505                          * This is crtc->mode and not crtc->state->mode for the
 506                          * fastboot check to work correctly. crtc_state->mode has
 507                          * I915_MODE_FLAG_INHERITED, which we clear to force check
 508                          * state.
 509                          */
 510                         DRM_DEBUG_KMS("looking for current mode on connector %s\n",
 511                                       connector->name);
 512                         modes[i] = &connector->state->crtc->mode;
 513                 }
 514                 crtcs[i] = new_crtc;
 515
 516                 DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",
 517                               connector->name,
 518                               pipe_name(to_intel_crtc(connector->state->crtc)->pipe),
 519                               connector->state->crtc->base.id,
 520                               modes[i]->hdisplay, modes[i]->vdisplay,
 521                               modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");
 522
 523                 fallback = false;
 524                 conn_configured |= (1 << i);
 525         }
 526
 527         if ((conn_configured & mask) != mask) {
 528                 pass++;
 529                 goto retry;
 530         }
 531
 532         /*
 533          * If the BIOS didn't enable everything it could, fall back to have the
 534          * same user experiencing of lighting up as much as possible like the
 535          * fbdev helper library.
 536          */
 537         if (num_connectors_enabled != num_connectors_detected &&
 538             num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {
 539                 DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
 540                 DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
 541                               num_connectors_detected);
 542                 fallback = true;
 543         }
 544
 545         if (fallback) {
 546 bail:
 547                 DRM_DEBUG_KMS("Not using firmware configuration\n");
 548                 memcpy(enabled, save_enabled, fb_helper->connector_count);
 549                 kfree(save_enabled);
 550                 return false;
 551         }
 552
 553         kfree(save_enabled);
 554         return true;
 555 }
 556
 557 static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
 558         .initial_config = intel_fb_initial_config,
 559         .gamma_set = intel_crtc_fb_gamma_set,
 560         .gamma_get = intel_crtc_fb_gamma_get,
 561         .fb_probe = intelfb_create,
 562 };
 563
 564 static void intel_fbdev_destroy(struct drm_device *dev,
 565                                 struct intel_fbdev *ifbdev)
 566 {
 567         /* We rely on the object-free to release the VMA pinning for
 568          * the info->screen_base mmaping. Leaking the VMA is simpler than
 569          * trying to rectify all the possible error paths leading here.
 570          */
 571
 572         drm_fb_helper_unregister_fbi(&ifbdev->helper);
 573         drm_fb_helper_release_fbi(&ifbdev->helper);
 574
 575         drm_fb_helper_fini(&ifbdev->helper);
 576
 577         if (ifbdev->fb) {
 578                 drm_framebuffer_unregister_private(&ifbdev->fb->base);
 579                 drm_framebuffer_remove(&ifbdev->fb->base);
 580         }
 581 }
 582
 583 /*
 584  * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
 585  * The core display code will have read out the current plane configuration,
 586  * so we use that to figure out if there's an object for us to use as the
 587  * fb, and if so, we re-use it for the fbdev configuration.
 588  *
 589  * Note we only support a single fb shared across pipes for boot (mostly for
 590  * fbcon), so we just find the biggest and use that.
 591  */
 592 static bool intel_fbdev_init_bios(struct drm_device *dev,
 593                                  struct intel_fbdev *ifbdev)
 594 {
 595         struct intel_framebuffer *fb = NULL;
 596         struct drm_crtc *crtc;
 597         struct intel_crtc *intel_crtc;
 598         unsigned int max_size = 0;
 599
 600         /* Find the largest fb */
 601         for_each_crtc(dev, crtc) {
 602                 struct drm_i915_gem_object *obj =
 603                         intel_fb_obj(crtc->primary->state->fb);
 604                 intel_crtc = to_intel_crtc(crtc);
 605
 606                 if (!crtc->state->active || !obj) {
 607                         DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",
 608                                       pipe_name(intel_crtc->pipe));
 609                         continue;
 610                 }
 611
 612                 if (obj->base.size > max_size) {
 613                         DRM_DEBUG_KMS("found possible fb from plane %c\n",
 614                                       pipe_name(intel_crtc->pipe));
 615                         fb = to_intel_framebuffer(crtc->primary->state->fb);
 616                         max_size = obj->base.size;
 617                 }
 618         }
 619
 620         if (!fb) {
 621                 DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");
 622                 goto out;
 623         }
 624
 625         /* Now make sure all the pipes will fit into it */
 626         for_each_crtc(dev, crtc) {
 627                 unsigned int cur_size;
 628
 629                 intel_crtc = to_intel_crtc(crtc);
 630
 631                 if (!crtc->state->active) {
 632                         DRM_DEBUG_KMS("pipe %c not active, skipping\n",
 633                                       pipe_name(intel_crtc->pipe));
 634                         continue;
 635                 }
 636
 637                 DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",
 638                               pipe_name(intel_crtc->pipe));
 639
 640                 /*
 641                  * See if the plane fb we found above will fit on this
 642                  * pipe.  Note we need to use the selected fb's pitch and bpp
 643                  * rather than the current pipe's, since they differ.
 644                  */
 645                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_hdisplay;
 646                 cur_size = cur_size * fb->base.bits_per_pixel / 8;
 647                 if (fb->base.pitches[0] < cur_size) {
 648                         DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
 649                                       pipe_name(intel_crtc->pipe),
 650                                       cur_size, fb->base.pitches[0]);
 651                         fb = NULL;
 652                         break;
 653                 }
 654
 655                 cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
 656                 cur_size = intel_fb_align_height(dev, cur_size,
 657                                                  fb->base.pixel_format,
 658                                                  fb->base.modifier[0]);
 659                 cur_size *= fb->base.pitches[0];
 660                 DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
 661                               pipe_name(intel_crtc->pipe),
 662                               intel_crtc->config->base.adjusted_mode.crtc_hdisplay,
 663                               intel_crtc->config->base.adjusted_mode.crtc_vdisplay,
 664                               fb->base.bits_per_pixel,
 665                               cur_size);
 666
 667                 if (cur_size > max_size) {
 668                         DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",
 669                                       pipe_name(intel_crtc->pipe),
 670                                       cur_size, max_size);
 671                         fb = NULL;
 672                         break;
 673                 }
 674
 675                 DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",
 676                               pipe_name(intel_crtc->pipe),
 677                               max_size, cur_size);
 678         }
 679
 680         if (!fb) {
 681                 DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");
 682                 goto out;
 683         }
 684
 685         ifbdev->preferred_bpp = fb->base.bits_per_pixel;
 686         ifbdev->fb = fb;
 687
 688         drm_framebuffer_reference(&ifbdev->fb->base);
 689
 690         /* Final pass to check if any active pipes don't have fbs */
 691         for_each_crtc(dev, crtc) {
 692                 intel_crtc = to_intel_crtc(crtc);
 693
 694                 if (!crtc->state->active)
 695                         continue;
 696
 697                 WARN(!crtc->primary->fb,
 698                      "re-used BIOS config but lost an fb on crtc %d\n",
 699                      crtc->base.id);
 700         }
 701
 702
 703         DRM_DEBUG_KMS("using BIOS fb for initial console\n");
 704         return true;
 705
 706 out:
 707
 708         return false;
 709 }
 710
 711 static void intel_fbdev_suspend_worker(struct work_struct *work)
 712 {
 713         intel_fbdev_set_suspend(container_of(work,
 714                                              struct drm_i915_private,
 715                                              fbdev_suspend_work)->dev,
 716                                 FBINFO_STATE_RUNNING,
 717                                 true);
 718 }
 719
 720 int intel_fbdev_init(struct drm_device *dev)
 721 {
 722         struct intel_fbdev *ifbdev;
 723         struct drm_i915_private *dev_priv = dev->dev_private;
 724         int ret;
 725
 726         if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))
 727                 return -ENODEV;
 728
 729         ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);
 730         if (ifbdev == NULL)
 731                 return -ENOMEM;
 732
 733         drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);
 734
 735         if (!intel_fbdev_init_bios(dev, ifbdev))
 736                 ifbdev->preferred_bpp = 32;
 737
 738         ret = drm_fb_helper_init(dev, &ifbdev->helper,
 739                                  INTEL_INFO(dev)->num_pipes, 4);
 740         if (ret) {
 741                 kfree(ifbdev);
 742                 return ret;
 743         }
 744
 745         ifbdev->helper.atomic = true;
 746
 747         dev_priv->fbdev = ifbdev;
 748         INIT_WORK(&dev_priv->fbdev_suspend_work, intel_fbdev_suspend_worker);
 749
 750         drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
 751
 752         return 0;
 753 }
 754
 755 static void intel_fbdev_initial_config(void *data, async_cookie_t cookie)
 756 {
 757         struct drm_i915_private *dev_priv = data;
 758         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 759
 760         /* Due to peculiar init order wrt to hpd handling this is separate. */
 761         if (drm_fb_helper_initial_config(&ifbdev->helper,
 762                                          ifbdev->preferred_bpp))
 763                 intel_fbdev_fini(dev_priv->dev);
 764 }
 765
 766 void intel_fbdev_initial_config_async(struct drm_device *dev)
 767 {
 768         async_schedule(intel_fbdev_initial_config, to_i915(dev));
 769 }
 770
 771 void intel_fbdev_fini(struct drm_device *dev)
 772 {
 773         struct drm_i915_private *dev_priv = dev->dev_private;
 774         if (!dev_priv->fbdev)
 775                 return;
 776
 777 #if 0
 778         flush_work(&dev_priv->fbdev_suspend_work);
 779
 780         if (!current_is_async())
 781 #endif
 782                 async_synchronize_full();
 783         intel_fbdev_destroy(dev, dev_priv->fbdev);
 784         kfree(dev_priv->fbdev);
 785         dev_priv->fbdev = NULL;
 786 }
 787
 788 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous)
 789 {
 790 #if 0
 791         struct drm_i915_private *dev_priv = dev->dev_private;
 792         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 793         struct fb_info *info;
 794
 795         if (!ifbdev)
 796                 return;
 797
 798         info = ifbdev->helper.fbdev;
 799
 800         if (synchronous) {
 801                 /* Flush any pending work to turn the console on, and then
 802                  * wait to turn it off. It must be synchronous as we are
 803                  * about to suspend or unload the driver.
 804                  *
 805                  * Note that from within the work-handler, we cannot flush
 806                  * ourselves, so only flush outstanding work upon suspend!
 807                  */
 808                 if (state != FBINFO_STATE_RUNNING)
 809                         flush_work(&dev_priv->fbdev_suspend_work);
 810                 console_lock();
 811         } else {
 812                 /*
 813                  * The console lock can be pretty contented on resume due
 814                  * to all the printk activity.  Try to keep it out of the hot
 815                  * path of resume if possible.
 816                  */
 817                 WARN_ON(state != FBINFO_STATE_RUNNING);
 818                 if (!console_trylock()) {
 819                         /* Don't block our own workqueue as this can
 820                          * be run in parallel with other i915.ko tasks.
 821                          */
 822                         schedule_work(&dev_priv->fbdev_suspend_work);
 823                         return;
 824                 }
 825         }
 826
 827         /* On resume from hibernation: If the object is shmemfs backed, it has
 828          * been restored from swap. If the object is stolen however, it will be
 829          * full of whatever garbage was left in there.
 830          */
 831         if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
 832                 memset_io(info->screen_base, 0, info->screen_size);
 833
 834         drm_fb_helper_set_suspend(&ifbdev->helper, state);
 835         console_unlock();
 836 #endif
 837 }
 838
 839 void intel_fbdev_output_poll_changed(struct drm_device *dev)
 840 {
 841         struct drm_i915_private *dev_priv = dev->dev_private;
 842         if (dev_priv->fbdev)
 843                 drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
 844 }
 845
 846 void intel_fbdev_restore_mode(struct drm_device *dev)
 847 {
 848         int ret;
 849         struct drm_i915_private *dev_priv = dev->dev_private;
 850         struct intel_fbdev *ifbdev = dev_priv->fbdev;
 851         struct drm_fb_helper *fb_helper;
 852
 853         if (!ifbdev)
 854                 return;
 855
 856         fb_helper = &ifbdev->helper;
 857
 858         /* XXX: avoid dead-locking the Xorg on exit */
 859         if (mutex_is_locked(&dev->mode_config.mutex)) {
 860                 DRM_ERROR("fubar while trying to restore kms_console\n");
 861                 return; /* drm_modeset_unlock_all(dev) ? */
 862         }
 863
 864         ret = drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
 865         if (ret) {
 866                 DRM_DEBUG("failed to restore crtc mode\n");
 867         } else {
 868                 mutex_lock(&fb_helper->dev->struct_mutex);
 869                 intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 870                 mutex_unlock(&fb_helper->dev->struct_mutex);
 871         }
 872 }