drivers/gpu/drm/i915/intel_fb.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/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/errno.h>
  30 #include <linux/string.h>
  31 #include <linux/mm.h>
  32 #include <linux/tty.h>
  33 #include <linux/slab.h>
  34 #include <linux/sysrq.h>
  35 #include <linux/delay.h>
  36 #include <linux/fb.h>
  37 #include <linux/init.h>
  38
  39 #include "drmP.h"
  40 #include "drm.h"
  41 #include "drm_crtc.h"
  42 #include "intel_drv.h"
  43 #include "i915_drm.h"
  44 #include "i915_drv.h"
  45
  46 struct intelfb_par {
  47         struct drm_device *dev;
  48         struct drm_display_mode *our_mode;
  49         struct intel_framebuffer *intel_fb;
  50         int crtc_count;
  51         /* crtc currently bound to this */
  52         uint32_t crtc_ids[2];
  53 };
  54
  55 static int intelfb_setcolreg(unsigned regno, unsigned red, unsigned green,
  56                         unsigned blue, unsigned transp,
  57                         struct fb_info *info)
  58 {
  59         struct intelfb_par *par = info->par;
  60         struct drm_device *dev = par->dev;
  61         struct drm_crtc *crtc;
  62         int i;
  63
  64         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
  65                 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
  66                 struct drm_mode_set *modeset = &intel_crtc->mode_set;
  67                 struct drm_framebuffer *fb = modeset->fb;
  68
  69                 for (i = 0; i < par->crtc_count; i++)
  70                         if (crtc->base.id == par->crtc_ids[i])
  71                                 break;
  72
  73                 if (i == par->crtc_count)
  74                         continue;
  75
  76
  77                 if (regno > 255)
  78                         return 1;
  79
  80                 if (fb->depth == 8) {
  81                         intel_crtc_fb_gamma_set(crtc, red, green, blue, regno);
  82                         return 0;
  83                 }
  84
  85                 if (regno < 16) {
  86                         switch (fb->depth) {
  87                         case 15:
  88                                 fb->pseudo_palette[regno] = ((red & 0xf800) >> 1) |
  89                                         ((green & 0xf800) >>  6) |
  90                                         ((blue & 0xf800) >> 11);
  91                                 break;
  92                         case 16:
  93                                 fb->pseudo_palette[regno] = (red & 0xf800) |
  94                                         ((green & 0xfc00) >>  5) |
  95                                         ((blue  & 0xf800) >> 11);
  96                                 break;
  97                         case 24:
  98                         case 32:
  99                                 fb->pseudo_palette[regno] = ((red & 0xff00) << 8) |
 100                                         (green & 0xff00) |
 101                                         ((blue  & 0xff00) >> 8);
 102                                 break;
 103                         }
 104                 }
 105         }
 106         return 0;
 107 }
 108
 109 static int intelfb_check_var(struct fb_var_screeninfo *var,
 110                         struct fb_info *info)
 111 {
 112         struct intelfb_par *par = info->par;
 113         struct intel_framebuffer *intel_fb = par->intel_fb;
 114         struct drm_framebuffer *fb = &intel_fb->base;
 115         int depth;
 116
 117         if (var->pixclock == -1 || !var->pixclock)
 118                 return -EINVAL;
 119
 120         /* Need to resize the fb object !!! */
 121         if (var->xres > fb->width || var->yres > fb->height) {
 122                 DRM_ERROR("Requested width/height is greater than current fb object %dx%d > %dx%d\n",var->xres,var->yres,fb->width,fb->height);
 123                 DRM_ERROR("Need resizing code.\n");
 124                 return -EINVAL;
 125         }
 126
 127         switch (var->bits_per_pixel) {
 128         case 16:
 129                 depth = (var->green.length == 6) ? 16 : 15;
 130                 break;
 131         case 32:
 132                 depth = (var->transp.length > 0) ? 32 : 24;
 133                 break;
 134         default:
 135                 depth = var->bits_per_pixel;
 136                 break;
 137         }
 138
 139         switch (depth) {
 140         case 8:
 141                 var->red.offset = 0;
 142                 var->green.offset = 0;
 143                 var->blue.offset = 0;
 144                 var->red.length = 8;
 145                 var->green.length = 8;
 146                 var->blue.length = 8;
 147                 var->transp.length = 0;
 148                 var->transp.offset = 0;
 149                 break;
 150         case 15:
 151                 var->red.offset = 10;
 152                 var->green.offset = 5;
 153                 var->blue.offset = 0;
 154                 var->red.length = 5;
 155                 var->green.length = 5;
 156                 var->blue.length = 5;
 157                 var->transp.length = 1;
 158                 var->transp.offset = 15;
 159                 break;
 160         case 16:
 161                 var->red.offset = 11;
 162                 var->green.offset = 5;
 163                 var->blue.offset = 0;
 164                 var->red.length = 5;
 165                 var->green.length = 6;
 166                 var->blue.length = 5;
 167                 var->transp.length = 0;
 168                 var->transp.offset = 0;
 169                 break;
 170         case 24:
 171                 var->red.offset = 16;
 172                 var->green.offset = 8;
 173                 var->blue.offset = 0;
 174                 var->red.length = 8;
 175                 var->green.length = 8;
 176                 var->blue.length = 8;
 177                 var->transp.length = 0;
 178                 var->transp.offset = 0;
 179                 break;
 180         case 32:
 181                 var->red.offset = 16;
 182                 var->green.offset = 8;
 183                 var->blue.offset = 0;
 184                 var->red.length = 8;
 185                 var->green.length = 8;
 186                 var->blue.length = 8;
 187                 var->transp.length = 8;
 188                 var->transp.offset = 24;
 189                 break;
 190         default:
 191                 return -EINVAL;
 192         }
 193
 194         return 0;
 195 }
 196
 197 /* this will let fbcon do the mode init */
 198 /* FIXME: take mode config lock? */
 199 static int intelfb_set_par(struct fb_info *info)
 200 {
 201         struct intelfb_par *par = info->par;
 202         struct drm_device *dev = par->dev;
 203         struct fb_var_screeninfo *var = &info->var;
 204         int i;
 205
 206         DRM_DEBUG("%d %d\n", var->xres, var->pixclock);
 207
 208         if (var->pixclock != -1) {
 209
 210                 DRM_ERROR("PIXEL CLCOK SET\n");
 211                 return -EINVAL;
 212         } else {
 213                 struct drm_crtc *crtc;
 214                 int ret;
 215
 216                 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 217                         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 218
 219                         for (i = 0; i < par->crtc_count; i++)
 220                                 if (crtc->base.id == par->crtc_ids[i])
 221                                         break;
 222
 223                         if (i == par->crtc_count)
 224                                 continue;
 225
 226                         if (crtc->fb == intel_crtc->mode_set.fb) {
 227                                 mutex_lock(&dev->mode_config.mutex);
 228                                 ret = crtc->funcs->set_config(&intel_crtc->mode_set);
 229                                 mutex_unlock(&dev->mode_config.mutex);
 230                                 if (ret)
 231                                         return ret;
 232                         }
 233                 }
 234                 return 0;
 235         }
 236 }
 237
 238 static int intelfb_pan_display(struct fb_var_screeninfo *var,
 239                                 struct fb_info *info)
 240 {
 241         struct intelfb_par *par = info->par;
 242         struct drm_device *dev = par->dev;
 243         struct drm_mode_set *modeset;
 244         struct drm_crtc *crtc;
 245         struct intel_crtc *intel_crtc;
 246         int ret = 0;
 247         int i;
 248
 249         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 250                 for (i = 0; i < par->crtc_count; i++)
 251                         if (crtc->base.id == par->crtc_ids[i])
 252                                 break;
 253
 254                 if (i == par->crtc_count)
 255                         continue;
 256
 257                 intel_crtc = to_intel_crtc(crtc);
 258                 modeset = &intel_crtc->mode_set;
 259
 260                 modeset->x = var->xoffset;
 261                 modeset->y = var->yoffset;
 262
 263                 if (modeset->num_connectors) {
 264                         mutex_lock(&dev->mode_config.mutex);
 265                         ret = crtc->funcs->set_config(modeset);
 266                         mutex_unlock(&dev->mode_config.mutex);
 267                         if (!ret) {
 268                                 info->var.xoffset = var->xoffset;
 269                                 info->var.yoffset = var->yoffset;
 270                         }
 271                 }
 272         }
 273
 274         return ret;
 275 }
 276
 277 static void intelfb_on(struct fb_info *info)
 278 {
 279         struct intelfb_par *par = info->par;
 280         struct drm_device *dev = par->dev;
 281         struct drm_crtc *crtc;
 282         struct drm_encoder *encoder;
 283         int i;
 284
 285         /*
 286          * For each CRTC in this fb, find all associated encoders
 287          * and turn them off, then turn off the CRTC.
 288          */
 289         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 290                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 291
 292                 for (i = 0; i < par->crtc_count; i++)
 293                         if (crtc->base.id == par->crtc_ids[i])
 294                                 break;
 295
 296                 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 297
 298                 /* Found a CRTC on this fb, now find encoders */
 299                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 300                         if (encoder->crtc == crtc) {
 301                                 struct drm_encoder_helper_funcs *encoder_funcs;
 302                                 encoder_funcs = encoder->helper_private;
 303                                 encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
 304                         }
 305                 }
 306         }
 307 }
 308
 309 static void intelfb_off(struct fb_info *info, int dpms_mode)
 310 {
 311         struct intelfb_par *par = info->par;
 312         struct drm_device *dev = par->dev;
 313         struct drm_crtc *crtc;
 314         struct drm_encoder *encoder;
 315         int i;
 316
 317         /*
 318          * For each CRTC in this fb, find all associated encoders
 319          * and turn them off, then turn off the CRTC.
 320          */
 321         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 322                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 323
 324                 for (i = 0; i < par->crtc_count; i++)
 325                         if (crtc->base.id == par->crtc_ids[i])
 326                                 break;
 327
 328                 /* Found a CRTC on this fb, now find encoders */
 329                 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 330                         if (encoder->crtc == crtc) {
 331                                 struct drm_encoder_helper_funcs *encoder_funcs;
 332                                 encoder_funcs = encoder->helper_private;
 333                                 encoder_funcs->dpms(encoder, dpms_mode);
 334                         }
 335                 }
 336                 if (dpms_mode == DRM_MODE_DPMS_OFF)
 337                         crtc_funcs->dpms(crtc, dpms_mode);
 338         }
 339 }
 340
 341 static int intelfb_blank(int blank, struct fb_info *info)
 342 {
 343         switch (blank) {
 344         case FB_BLANK_UNBLANK:
 345                 intelfb_on(info);
 346                 break;
 347         case FB_BLANK_NORMAL:
 348                 intelfb_off(info, DRM_MODE_DPMS_STANDBY);
 349                 break;
 350         case FB_BLANK_HSYNC_SUSPEND:
 351                 intelfb_off(info, DRM_MODE_DPMS_STANDBY);
 352                 break;
 353         case FB_BLANK_VSYNC_SUSPEND:
 354                 intelfb_off(info, DRM_MODE_DPMS_SUSPEND);
 355                 break;
 356         case FB_BLANK_POWERDOWN:
 357                 intelfb_off(info, DRM_MODE_DPMS_OFF);
 358                 break;
 359         }
 360         return 0;
 361 }
 362
 363 static struct fb_ops intelfb_ops = {
 364         .owner = THIS_MODULE,
 365         .fb_check_var = intelfb_check_var,
 366         .fb_set_par = intelfb_set_par,
 367         .fb_setcolreg = intelfb_setcolreg,
 368         .fb_fillrect = cfb_fillrect,
 369         .fb_copyarea = cfb_copyarea,
 370         .fb_imageblit = cfb_imageblit,
 371         .fb_pan_display = intelfb_pan_display,
 372         .fb_blank = intelfb_blank,
 373 };
 374
 375 /**
 376  * Curretly it is assumed that the old framebuffer is reused.
 377  *
 378  * LOCKING
 379  * caller should hold the mode config lock.
 380  *
 381  */
 382 int intelfb_resize(struct drm_device *dev, struct drm_crtc *crtc)
 383 {
 384         struct fb_info *info;
 385         struct drm_framebuffer *fb;
 386         struct drm_display_mode *mode = crtc->desired_mode;
 387
 388         fb = crtc->fb;
 389         if (!fb)
 390                 return 1;
 391
 392         info = fb->fbdev;
 393         if (!info)
 394                 return 1;
 395
 396         if (!mode)
 397                 return 1;
 398
 399         info->var.xres = mode->hdisplay;
 400         info->var.right_margin = mode->hsync_start - mode->hdisplay;
 401         info->var.hsync_len = mode->hsync_end - mode->hsync_start;
 402         info->var.left_margin = mode->htotal - mode->hsync_end;
 403         info->var.yres = mode->vdisplay;
 404         info->var.lower_margin = mode->vsync_start - mode->vdisplay;
 405         info->var.vsync_len = mode->vsync_end - mode->vsync_start;
 406         info->var.upper_margin = mode->vtotal - mode->vsync_end;
 407         info->var.pixclock = 10000000 / mode->htotal * 1000 / mode->vtotal * 100;
 408         /* avoid overflow */
 409         info->var.pixclock = info->var.pixclock * 1000 / mode->vrefresh;
 410
 411         return 0;
 412 }
 413 EXPORT_SYMBOL(intelfb_resize);
 414
 415 static struct drm_mode_set kernelfb_mode;
 416
 417 static int intelfb_panic(struct notifier_block *n, unsigned long ununsed,
 418                          void *panic_str)
 419 {
 420         DRM_ERROR("panic occurred, switching back to text console\n");
 421
 422         intelfb_restore();
 423         return 0;
 424 }
 425
 426 static struct notifier_block paniced = {
 427         .notifier_call = intelfb_panic,
 428 };
 429
 430 static int intelfb_create(struct drm_device *dev, uint32_t fb_width,
 431                           uint32_t fb_height, uint32_t surface_width,
 432                           uint32_t surface_height,
 433                           struct intel_framebuffer **intel_fb_p)
 434 {
 435         struct fb_info *info;
 436         struct intelfb_par *par;
 437         struct drm_framebuffer *fb;
 438         struct intel_framebuffer *intel_fb;
 439         struct drm_mode_fb_cmd mode_cmd;
 440         struct drm_gem_object *fbo = NULL;
 441         struct drm_i915_gem_object *obj_priv;
 442         struct device *device = &dev->pdev->dev;
 443         int size, ret, mmio_bar = IS_I9XX(dev) ? 0 : 1;
 444
 445         mode_cmd.width = surface_width;
 446         mode_cmd.height = surface_height;
 447
 448         mode_cmd.bpp = 32;
 449         mode_cmd.pitch = ALIGN(mode_cmd.width * ((mode_cmd.bpp + 1) / 8), 64);
 450         mode_cmd.depth = 24;
 451
 452         size = mode_cmd.pitch * mode_cmd.height;
 453         size = ALIGN(size, PAGE_SIZE);
 454         fbo = drm_gem_object_alloc(dev, size);
 455         if (!fbo) {
 456                 printk(KERN_ERR "failed to allocate framebuffer\n");
 457                 ret = -ENOMEM;
 458                 goto out;
 459         }
 460         obj_priv = fbo->driver_private;
 461
 462         mutex_lock(&dev->struct_mutex);
 463
 464         ret = i915_gem_object_pin(fbo, PAGE_SIZE);
 465         if (ret) {
 466                 DRM_ERROR("failed to pin fb: %d\n", ret);
 467                 goto out_unref;
 468         }
 469
 470         /* Flush everything out, we'll be doing GTT only from now on */
 471         i915_gem_object_set_to_gtt_domain(fbo, 1);
 472
 473         ret = intel_framebuffer_create(dev, &mode_cmd, &fb, fbo);
 474         if (ret) {
 475                 DRM_ERROR("failed to allocate fb.\n");
 476                 goto out_unpin;
 477         }
 478
 479         list_add(&fb->filp_head, &dev->mode_config.fb_kernel_list);
 480
 481         intel_fb = to_intel_framebuffer(fb);
 482         *intel_fb_p = intel_fb;
 483
 484         info = framebuffer_alloc(sizeof(struct intelfb_par), device);
 485         if (!info) {
 486                 ret = -ENOMEM;
 487                 goto out_unpin;
 488         }
 489
 490         par = info->par;
 491
 492         strcpy(info->fix.id, "inteldrmfb");
 493         info->fix.type = FB_TYPE_PACKED_PIXELS;
 494         info->fix.visual = FB_VISUAL_TRUECOLOR;
 495         info->fix.type_aux = 0;
 496         info->fix.xpanstep = 1; /* doing it in hw */
 497         info->fix.ypanstep = 1; /* doing it in hw */
 498         info->fix.ywrapstep = 0;
 499         info->fix.accel = FB_ACCEL_I830;
 500         info->fix.type_aux = 0;
 501
 502         info->flags = FBINFO_DEFAULT;
 503
 504         info->fbops = &intelfb_ops;
 505
 506         info->fix.line_length = fb->pitch;
 507         info->fix.smem_start = dev->mode_config.fb_base + obj_priv->gtt_offset;
 508         info->fix.smem_len = size;
 509
 510         info->flags = FBINFO_DEFAULT;
 511
 512         info->screen_base = ioremap_wc(dev->agp->base + obj_priv->gtt_offset,
 513                                        size);
 514         if (!info->screen_base) {
 515                 ret = -ENOSPC;
 516                 goto out_unpin;
 517         }
 518         info->screen_size = size;
 519
 520 //      memset(info->screen_base, 0, size);
 521
 522         info->pseudo_palette = fb->pseudo_palette;
 523         info->var.xres_virtual = fb->width;
 524         info->var.yres_virtual = fb->height;
 525         info->var.bits_per_pixel = fb->bits_per_pixel;
 526         info->var.xoffset = 0;
 527         info->var.yoffset = 0;
 528         info->var.activate = FB_ACTIVATE_NOW;
 529         info->var.height = -1;
 530         info->var.width = -1;
 531
 532         info->var.xres = fb_width;
 533         info->var.yres = fb_height;
 534
 535         /* FIXME: we really shouldn't expose mmio space at all */
 536         info->fix.mmio_start = pci_resource_start(dev->pdev, mmio_bar);
 537         info->fix.mmio_len = pci_resource_len(dev->pdev, mmio_bar);
 538
 539         info->pixmap.size = 64*1024;
 540         info->pixmap.buf_align = 8;
 541         info->pixmap.access_align = 32;
 542         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 543         info->pixmap.scan_align = 1;
 544
 545         switch(fb->depth) {
 546         case 8:
 547                 info->var.red.offset = 0;
 548                 info->var.green.offset = 0;
 549                 info->var.blue.offset = 0;
 550                 info->var.red.length = 8; /* 8bit DAC */
 551                 info->var.green.length = 8;
 552                 info->var.blue.length = 8;
 553                 info->var.transp.offset = 0;
 554                 info->var.transp.length = 0;
 555                 break;
 556         case 15:
 557                 info->var.red.offset = 10;
 558                 info->var.green.offset = 5;
 559                 info->var.blue.offset = 0;
 560                 info->var.red.length = 5;
 561                 info->var.green.length = 5;
 562                 info->var.blue.length = 5;
 563                 info->var.transp.offset = 15;
 564                 info->var.transp.length = 1;
 565                 break;
 566         case 16:
 567                 info->var.red.offset = 11;
 568                 info->var.green.offset = 5;
 569                 info->var.blue.offset = 0;
 570                 info->var.red.length = 5;
 571                 info->var.green.length = 6;
 572                 info->var.blue.length = 5;
 573                 info->var.transp.offset = 0;
 574                 break;
 575         case 24:
 576                 info->var.red.offset = 16;
 577                 info->var.green.offset = 8;
 578                 info->var.blue.offset = 0;
 579                 info->var.red.length = 8;
 580                 info->var.green.length = 8;
 581                 info->var.blue.length = 8;
 582                 info->var.transp.offset = 0;
 583                 info->var.transp.length = 0;
 584                 break;
 585         case 32:
 586                 info->var.red.offset = 16;
 587                 info->var.green.offset = 8;
 588                 info->var.blue.offset = 0;
 589                 info->var.red.length = 8;
 590                 info->var.green.length = 8;
 591                 info->var.blue.length = 8;
 592                 info->var.transp.offset = 24;
 593                 info->var.transp.length = 8;
 594                 break;
 595         default:
 596                 break;
 597         }
 598
 599         fb->fbdev = info;
 600
 601         par->intel_fb = intel_fb;
 602         par->dev = dev;
 603
 604         /* To allow resizeing without swapping buffers */
 605         printk("allocated %dx%d fb: 0x%08x, bo %p\n", intel_fb->base.width,
 606                intel_fb->base.height, obj_priv->gtt_offset, fbo);
 607
 608         mutex_unlock(&dev->struct_mutex);
 609         return 0;
 610
 611 out_unpin:
 612         i915_gem_object_unpin(fbo);
 613 out_unref:
 614         drm_gem_object_unreference(fbo);
 615         mutex_unlock(&dev->struct_mutex);
 616 out:
 617         return ret;
 618 }
 619
 620 static int intelfb_multi_fb_probe_crtc(struct drm_device *dev, struct drm_crtc *crtc)
 621 {
 622         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 623         struct intel_framebuffer *intel_fb;
 624         struct drm_framebuffer *fb;
 625         struct drm_connector *connector;
 626         struct fb_info *info;
 627         struct intelfb_par *par;
 628         struct drm_mode_set *modeset;
 629         unsigned int width, height;
 630         int new_fb = 0;
 631         int ret, i, conn_count;
 632
 633         if (!drm_helper_crtc_in_use(crtc))
 634                 return 0;
 635
 636         if (!crtc->desired_mode)
 637                 return 0;
 638
 639         width = crtc->desired_mode->hdisplay;
 640         height = crtc->desired_mode->vdisplay;
 641
 642         /* is there an fb bound to this crtc already */
 643         if (!intel_crtc->mode_set.fb) {
 644                 ret = intelfb_create(dev, width, height, width, height, &intel_fb);
 645                 if (ret)
 646                         return -EINVAL;
 647                 new_fb = 1;
 648         } else {
 649                 fb = intel_crtc->mode_set.fb;
 650                 intel_fb = to_intel_framebuffer(fb);
 651                 if ((intel_fb->base.width < width) || (intel_fb->base.height < height))
 652                         return -EINVAL;
 653         }
 654
 655         info = intel_fb->base.fbdev;
 656         par = info->par;
 657
 658         modeset = &intel_crtc->mode_set;
 659         modeset->fb = &intel_fb->base;
 660         conn_count = 0;
 661         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 662                 if (connector->encoder)
 663                         if (connector->encoder->crtc == modeset->crtc) {
 664                                 modeset->connectors[conn_count] = connector;
 665                                 conn_count++;
 666                                 if (conn_count > INTELFB_CONN_LIMIT)
 667                                         BUG();
 668                         }
 669         }
 670
 671         for (i = conn_count; i < INTELFB_CONN_LIMIT; i++)
 672                 modeset->connectors[i] = NULL;
 673
 674         par->crtc_ids[0] = crtc->base.id;
 675
 676         modeset->num_connectors = conn_count;
 677         if (modeset->mode != modeset->crtc->desired_mode)
 678                 modeset->mode = modeset->crtc->desired_mode;
 679
 680         par->crtc_count = 1;
 681
 682         if (new_fb) {
 683                 info->var.pixclock = -1;
 684                 if (register_framebuffer(info) < 0)
 685                         return -EINVAL;
 686         } else
 687                 intelfb_set_par(info);
 688
 689         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 690                info->fix.id);
 691
 692         /* Switch back to kernel console on panic */
 693         kernelfb_mode = *modeset;
 694         atomic_notifier_chain_register(&panic_notifier_list, &paniced);
 695         printk(KERN_INFO "registered panic notifier\n");
 696
 697         return 0;
 698 }
 699
 700 static int intelfb_multi_fb_probe(struct drm_device *dev)
 701 {
 702
 703         struct drm_crtc *crtc;
 704         int ret = 0;
 705
 706         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 707                 ret = intelfb_multi_fb_probe_crtc(dev, crtc);
 708                 if (ret)
 709                         return ret;
 710         }
 711         return ret;
 712 }
 713
 714 static int intelfb_single_fb_probe(struct drm_device *dev)
 715 {
 716         struct drm_crtc *crtc;
 717         struct drm_connector *connector;
 718         unsigned int fb_width = (unsigned)-1, fb_height = (unsigned)-1;
 719         unsigned int surface_width = 0, surface_height = 0;
 720         int new_fb = 0;
 721         int crtc_count = 0;
 722         int ret, i, conn_count = 0;
 723         struct intel_framebuffer *intel_fb;
 724         struct fb_info *info;
 725         struct intelfb_par *par;
 726         struct drm_mode_set *modeset = NULL;
 727
 728         DRM_DEBUG("\n");
 729
 730         /* Get a count of crtcs now in use and new min/maxes width/heights */
 731         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 732                 if (!drm_helper_crtc_in_use(crtc))
 733                         continue;
 734
 735                 crtc_count++;
 736                 if (!crtc->desired_mode)
 737                         continue;
 738
 739                 /* Smallest mode determines console size... */
 740                 if (crtc->desired_mode->hdisplay < fb_width)
 741                         fb_width = crtc->desired_mode->hdisplay;
 742
 743                 if (crtc->desired_mode->vdisplay < fb_height)
 744                         fb_height = crtc->desired_mode->vdisplay;
 745
 746                 /* ... but largest for memory allocation dimensions */
 747                 if (crtc->desired_mode->hdisplay > surface_width)
 748                         surface_width = crtc->desired_mode->hdisplay;
 749
 750                 if (crtc->desired_mode->vdisplay > surface_height)
 751                         surface_height = crtc->desired_mode->vdisplay;
 752         }
 753
 754         if (crtc_count == 0 || fb_width == -1 || fb_height == -1) {
 755                 /* hmm everyone went away - assume VGA cable just fell out
 756                    and will come back later. */
 757                 DRM_DEBUG("no CRTCs available?\n");
 758                 return 0;
 759         }
 760
 761 //fail
 762         /* Find the fb for our new config */
 763         if (list_empty(&dev->mode_config.fb_kernel_list)) {
 764                 DRM_DEBUG("creating new fb (console size %dx%d, "
 765                           "buffer size %dx%d)\n", fb_width, fb_height,
 766                           surface_width, surface_height);
 767                 ret = intelfb_create(dev, fb_width, fb_height, surface_width,
 768                                      surface_height, &intel_fb);
 769                 if (ret)
 770                         return -EINVAL;
 771                 new_fb = 1;
 772         } else {
 773                 struct drm_framebuffer *fb;
 774
 775                 fb = list_first_entry(&dev->mode_config.fb_kernel_list,
 776                                       struct drm_framebuffer, filp_head);
 777                 intel_fb = to_intel_framebuffer(fb);
 778
 779                 /* if someone hotplugs something bigger than we have already
 780                  * allocated, we are pwned.  As really we can't resize an
 781                  * fbdev that is in the wild currently due to fbdev not really
 782                  * being designed for the lower layers moving stuff around
 783                  * under it.
 784                  * - so in the grand style of things - punt.
 785                  */
 786                 if ((fb->width < surface_width) ||
 787                     (fb->height < surface_height)) {
 788                         DRM_ERROR("fb not large enough for console\n");
 789                         return -EINVAL;
 790                 }
 791         }
 792 // fail
 793
 794         info = intel_fb->base.fbdev;
 795         par = info->par;
 796
 797         crtc_count = 0;
 798         /*
 799          * For each CRTC, set up the connector list for the CRTC's mode
 800          * set configuration.
 801          */
 802         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 803                 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 804
 805                 modeset = &intel_crtc->mode_set;
 806                 modeset->fb = &intel_fb->base;
 807                 conn_count = 0;
 808                 list_for_each_entry(connector, &dev->mode_config.connector_list,
 809                                     head) {
 810                         if (!connector->encoder)
 811                                 continue;
 812
 813                         if(connector->encoder->crtc == modeset->crtc) {
 814                                 modeset->connectors[conn_count++] = connector;
 815                                 if (conn_count > INTELFB_CONN_LIMIT)
 816                                         BUG();
 817                         }
 818                 }
 819
 820                 /* Zero out remaining connector pointers */
 821                 for (i = conn_count; i < INTELFB_CONN_LIMIT; i++)
 822                         modeset->connectors[i] = NULL;
 823
 824                 par->crtc_ids[crtc_count++] = crtc->base.id;
 825
 826                 modeset->num_connectors = conn_count;
 827                 if (modeset->mode != modeset->crtc->desired_mode)
 828                         modeset->mode = modeset->crtc->desired_mode;
 829         }
 830         par->crtc_count = crtc_count;
 831
 832         if (new_fb) {
 833                 info->var.pixclock = -1;
 834                 if (register_framebuffer(info) < 0)
 835                         return -EINVAL;
 836         } else
 837                 intelfb_set_par(info);
 838
 839         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 840                info->fix.id);
 841
 842         /* Switch back to kernel console on panic */
 843         kernelfb_mode = *modeset;
 844         atomic_notifier_chain_register(&panic_notifier_list, &paniced);
 845         printk(KERN_INFO "registered panic notifier\n");
 846
 847         return 0;
 848 }
 849
 850 /**
 851  * intelfb_restore - restore the framebuffer console (kernel) config
 852  *
 853  * Restore's the kernel's fbcon mode, used for lastclose & panic paths.
 854  */
 855 void intelfb_restore(void)
 856 {
 857         drm_crtc_helper_set_config(&kernelfb_mode);
 858 }
 859
 860 static void intelfb_sysrq(int dummy1, struct tty_struct *dummy3)
 861 {
 862         intelfb_restore();
 863 }
 864
 865 static struct sysrq_key_op sysrq_intelfb_restore_op = {
 866         .handler = intelfb_sysrq,
 867         .help_msg = "force-fb(V)",
 868         .action_msg = "Restore framebuffer console",
 869 };
 870
 871 int intelfb_probe(struct drm_device *dev)
 872 {
 873         int ret;
 874
 875         DRM_DEBUG("\n");
 876
 877         /* something has changed in the lower levels of hell - deal with it
 878            here */
 879
 880         /* two modes : a) 1 fb to rule all crtcs.
 881                        b) one fb per crtc.
 882            two actions 1) new connected device
 883                        2) device removed.
 884            case a/1 : if the fb surface isn't big enough - resize the surface fb.
 885                       if the fb size isn't big enough - resize fb into surface.
 886                       if everything big enough configure the new crtc/etc.
 887            case a/2 : undo the configuration
 888                       possibly resize down the fb to fit the new configuration.
 889            case b/1 : see if it is on a new crtc - setup a new fb and add it.
 890            case b/2 : teardown the new fb.
 891         */
 892
 893         /* mode a first */
 894         /* search for an fb */
 895         if (i915_fbpercrtc == 1) {
 896                 ret = intelfb_multi_fb_probe(dev);
 897         } else {
 898                 ret = intelfb_single_fb_probe(dev);
 899         }
 900
 901         register_sysrq_key('v', &sysrq_intelfb_restore_op);
 902
 903         return ret;
 904 }
 905 EXPORT_SYMBOL(intelfb_probe);
 906
 907 int intelfb_remove(struct drm_device *dev, struct drm_framebuffer *fb)
 908 {
 909         struct fb_info *info;
 910
 911         if (!fb)
 912                 return -EINVAL;
 913
 914         info = fb->fbdev;
 915
 916         if (info) {
 917                 unregister_framebuffer(info);
 918                 iounmap(info->screen_base);
 919                 framebuffer_release(info);
 920         }
 921
 922         atomic_notifier_chain_unregister(&panic_notifier_list, &paniced);
 923         memset(&kernelfb_mode, 0, sizeof(struct drm_mode_set));
 924         return 0;
 925 }
 926 EXPORT_SYMBOL(intelfb_remove);
 927 MODULE_LICENSE("GPL and additional rights");