release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2007 David Airlie
   4  * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  22  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  25  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 #include "drmP.h"
  30 #include "vmwgfx_drv.h"
  31
  32 #include "ttm/ttm_placement.h"
  33
  34 #define VMW_DIRTY_DELAY (HZ / 30)
  35
  36 struct vmw_fb_par {
  37         struct vmw_private *vmw_priv;
  38
  39         void *vmalloc;
  40
  41         struct vmw_dma_buffer *vmw_bo;
  42         struct ttm_bo_kmap_obj map;
  43
  44         u32 pseudo_palette[17];
  45
  46         unsigned depth;
  47         unsigned bpp;
  48
  49         unsigned max_width;
  50         unsigned max_height;
  51
  52         void *bo_ptr;
  53         unsigned bo_size;
  54         bool bo_iowrite;
  55
  56         struct {
  57                 spinlock_t lock;
  58                 bool active;
  59                 unsigned x1;
  60                 unsigned y1;
  61                 unsigned x2;
  62                 unsigned y2;
  63         } dirty;
  64 };
  65
  66 static int vmw_fb_setcolreg(unsigned regno, unsigned red, unsigned green,
  67                             unsigned blue, unsigned transp,
  68                             struct fb_info *info)
  69 {
  70         struct vmw_fb_par *par = info->par;
  71         u32 *pal = par->pseudo_palette;
  72
  73         if (regno > 15) {
  74                 DRM_ERROR("Bad regno %u.\n", regno);
  75                 return 1;
  76         }
  77
  78         switch (par->depth) {
  79         case 24:
  80         case 32:
  81                 pal[regno] = ((red & 0xff00) << 8) |
  82                               (green & 0xff00) |
  83                              ((blue  & 0xff00) >> 8);
  84                 break;
  85         default:
  86                 DRM_ERROR("Bad depth %u, bpp %u.\n", par->depth, par->bpp);
  87                 return 1;
  88         }
  89
  90         return 0;
  91 }
  92
  93 static int vmw_fb_check_var(struct fb_var_screeninfo *var,
  94                             struct fb_info *info)
  95 {
  96         int depth = var->bits_per_pixel;
  97         struct vmw_fb_par *par = info->par;
  98         struct vmw_private *vmw_priv = par->vmw_priv;
  99
 100         switch (var->bits_per_pixel) {
 101         case 32:
 102                 depth = (var->transp.length > 0) ? 32 : 24;
 103                 break;
 104         default:
 105                 DRM_ERROR("Bad bpp %u.\n", var->bits_per_pixel);
 106                 return -EINVAL;
 107         }
 108
 109         switch (depth) {
 110         case 24:
 111                 var->red.offset = 16;
 112                 var->green.offset = 8;
 113                 var->blue.offset = 0;
 114                 var->red.length = 8;
 115                 var->green.length = 8;
 116                 var->blue.length = 8;
 117                 var->transp.length = 0;
 118                 var->transp.offset = 0;
 119                 break;
 120         case 32:
 121                 var->red.offset = 16;
 122                 var->green.offset = 8;
 123                 var->blue.offset = 0;
 124                 var->red.length = 8;
 125                 var->green.length = 8;
 126                 var->blue.length = 8;
 127                 var->transp.length = 8;
 128                 var->transp.offset = 24;
 129                 break;
 130         default:
 131                 DRM_ERROR("Bad depth %u.\n", depth);
 132                 return -EINVAL;
 133         }
 134
 135         if (!(vmw_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY) &&
 136             (var->xoffset != 0 || var->yoffset != 0)) {
 137                 DRM_ERROR("Can not handle panning without display topology\n");
 138                 return -EINVAL;
 139         }
 140
 141         if ((var->xoffset + var->xres) > par->max_width ||
 142             (var->yoffset + var->yres) > par->max_height) {
 143                 DRM_ERROR("Requested geom can not fit in framebuffer\n");
 144                 return -EINVAL;
 145         }
 146
 147         return 0;
 148 }
 149
 150 static int vmw_fb_set_par(struct fb_info *info)
 151 {
 152         struct vmw_fb_par *par = info->par;
 153         struct vmw_private *vmw_priv = par->vmw_priv;
 154
 155         vmw_kms_write_svga(vmw_priv, info->var.xres, info->var.yres,
 156                            info->fix.line_length,
 157                            par->bpp, par->depth);
 158         if (vmw_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY) {
 159                 /* TODO check if pitch and offset changes */
 160                 vmw_write(vmw_priv, SVGA_REG_NUM_GUEST_DISPLAYS, 1);
 161                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, 0);
 162                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_IS_PRIMARY, true);
 163                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_X, info->var.xoffset);
 164                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_Y, info->var.yoffset);
 165                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_WIDTH, info->var.xres);
 166                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_HEIGHT, info->var.yres);
 167                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID);
 168         }
 169
 170         /* This is really helpful since if this fails the user
 171          * can probably not see anything on the screen.
 172          */
 173         WARN_ON(vmw_read(vmw_priv, SVGA_REG_FB_OFFSET) != 0);
 174
 175         return 0;
 176 }
 177
 178 static int vmw_fb_pan_display(struct fb_var_screeninfo *var,
 179                               struct fb_info *info)
 180 {
 181         return 0;
 182 }
 183
 184 static int vmw_fb_blank(int blank, struct fb_info *info)
 185 {
 186         return 0;
 187 }
 188
 189 /*
 190  * Dirty code
 191  */
 192
 193 static void vmw_fb_dirty_flush(struct vmw_fb_par *par)
 194 {
 195         struct vmw_private *vmw_priv = par->vmw_priv;
 196         struct fb_info *info = vmw_priv->fb_info;
 197         int stride = (info->fix.line_length / 4);
 198         int *src = (int *)info->screen_base;
 199         __le32 __iomem *vram_mem = par->bo_ptr;
 200         unsigned long flags;
 201         unsigned x, y, w, h;
 202         int i, k;
 203         struct {
 204                 uint32_t header;
 205                 SVGAFifoCmdUpdate body;
 206         } *cmd;
 207
 208         spin_lock_irqsave(&par->dirty.lock, flags);
 209         if (!par->dirty.active) {
 210                 spin_unlock_irqrestore(&par->dirty.lock, flags);
 211                 return;
 212         }
 213         x = par->dirty.x1;
 214         y = par->dirty.y1;
 215         w = min(par->dirty.x2, info->var.xres) - x;
 216         h = min(par->dirty.y2, info->var.yres) - y;
 217         par->dirty.x1 = par->dirty.x2 = 0;
 218         par->dirty.y1 = par->dirty.y2 = 0;
 219         spin_unlock_irqrestore(&par->dirty.lock, flags);
 220
 221         for (i = y * stride; i < info->fix.smem_len / 4; i += stride) {
 222                 for (k = i+x; k < i+x+w && k < info->fix.smem_len / 4; k++)
 223                         iowrite32(src[k], vram_mem + k);
 224         }
 225
 226
 227         cmd = vmw_fifo_reserve(vmw_priv, sizeof(*cmd));
 228         if (unlikely(cmd == NULL)) {
 229                 DRM_ERROR("Fifo reserve failed.\n");
 230                 return;
 231         }
 232
 233         cmd->header = cpu_to_le32(SVGA_CMD_UPDATE);
 234         cmd->body.x = cpu_to_le32(x);
 235         cmd->body.y = cpu_to_le32(y);
 236         cmd->body.width = cpu_to_le32(w);
 237         cmd->body.height = cpu_to_le32(h);
 238         vmw_fifo_commit(vmw_priv, sizeof(*cmd));
 239 }
 240
 241 static void vmw_fb_dirty_mark(struct vmw_fb_par *par,
 242                               unsigned x1, unsigned y1,
 243                               unsigned width, unsigned height)
 244 {
 245         struct fb_info *info = par->vmw_priv->fb_info;
 246         unsigned long flags;
 247         unsigned x2 = x1 + width;
 248         unsigned y2 = y1 + height;
 249
 250         spin_lock_irqsave(&par->dirty.lock, flags);
 251         if (par->dirty.x1 == par->dirty.x2) {
 252                 par->dirty.x1 = x1;
 253                 par->dirty.y1 = y1;
 254                 par->dirty.x2 = x2;
 255                 par->dirty.y2 = y2;
 256                 /* if we are active start the dirty work
 257                  * we share the work with the defio system */
 258                 if (par->dirty.active)
 259                         schedule_delayed_work(&info->deferred_work, VMW_DIRTY_DELAY);
 260         } else {
 261                 if (x1 < par->dirty.x1)
 262                         par->dirty.x1 = x1;
 263                 if (y1 < par->dirty.y1)
 264                         par->dirty.y1 = y1;
 265                 if (x2 > par->dirty.x2)
 266                         par->dirty.x2 = x2;
 267                 if (y2 > par->dirty.y2)
 268                         par->dirty.y2 = y2;
 269         }
 270         spin_unlock_irqrestore(&par->dirty.lock, flags);
 271 }
 272
 273 static void vmw_deferred_io(struct fb_info *info,
 274                             struct list_head *pagelist)
 275 {
 276         struct vmw_fb_par *par = info->par;
 277         unsigned long start, end, min, max;
 278         unsigned long flags;
 279         struct page *page;
 280         int y1, y2;
 281
 282         min = ULONG_MAX;
 283         max = 0;
 284         list_for_each_entry(page, pagelist, lru) {
 285                 start = page->index << PAGE_SHIFT;
 286                 end = start + PAGE_SIZE - 1;
 287                 min = min(min, start);
 288                 max = max(max, end);
 289         }
 290
 291         if (min < max) {
 292                 y1 = min / info->fix.line_length;
 293                 y2 = (max / info->fix.line_length) + 1;
 294
 295                 spin_lock_irqsave(&par->dirty.lock, flags);
 296                 par->dirty.x1 = 0;
 297                 par->dirty.y1 = y1;
 298                 par->dirty.x2 = info->var.xres;
 299                 par->dirty.y2 = y2;
 300                 spin_unlock_irqrestore(&par->dirty.lock, flags);
 301         }
 302
 303         vmw_fb_dirty_flush(par);
 304 };
 305
 306 struct fb_deferred_io vmw_defio = {
 307         .delay          = VMW_DIRTY_DELAY,
 308         .deferred_io    = vmw_deferred_io,
 309 };
 310
 311 /*
 312  * Draw code
 313  */
 314
 315 static void vmw_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 316 {
 317         cfb_fillrect(info, rect);
 318         vmw_fb_dirty_mark(info->par, rect->dx, rect->dy,
 319                           rect->width, rect->height);
 320 }
 321
 322 static void vmw_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
 323 {
 324         cfb_copyarea(info, region);
 325         vmw_fb_dirty_mark(info->par, region->dx, region->dy,
 326                           region->width, region->height);
 327 }
 328
 329 static void vmw_fb_imageblit(struct fb_info *info, const struct fb_image *image)
 330 {
 331         cfb_imageblit(info, image);
 332         vmw_fb_dirty_mark(info->par, image->dx, image->dy,
 333                           image->width, image->height);
 334 }
 335
 336 /*
 337  * Bring up code
 338  */
 339
 340 static struct fb_ops vmw_fb_ops = {
 341         .owner = THIS_MODULE,
 342         .fb_check_var = vmw_fb_check_var,
 343         .fb_set_par = vmw_fb_set_par,
 344         .fb_setcolreg = vmw_fb_setcolreg,
 345         .fb_fillrect = vmw_fb_fillrect,
 346         .fb_copyarea = vmw_fb_copyarea,
 347         .fb_imageblit = vmw_fb_imageblit,
 348         .fb_pan_display = vmw_fb_pan_display,
 349         .fb_blank = vmw_fb_blank,
 350 };
 351
 352 static int vmw_fb_create_bo(struct vmw_private *vmw_priv,
 353                             size_t size, struct vmw_dma_buffer **out)
 354 {
 355         struct vmw_dma_buffer *vmw_bo;
 356         struct ttm_placement ne_placement = vmw_vram_ne_placement;
 357         int ret;
 358
 359         ne_placement.lpfn = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 360
 361         /* interuptable? */
 362         ret = ttm_write_lock(&vmw_priv->fbdev_master.lock, false);
 363         if (unlikely(ret != 0))
 364                 return ret;
 365
 366         vmw_bo = kmalloc(sizeof(*vmw_bo), GFP_KERNEL);
 367         if (!vmw_bo)
 368                 goto err_unlock;
 369
 370         ret = vmw_dmabuf_init(vmw_priv, vmw_bo, size,
 371                               &ne_placement,
 372                               false,
 373                               &vmw_dmabuf_bo_free);
 374         if (unlikely(ret != 0))
 375                 goto err_unlock; /* init frees the buffer on failure */
 376
 377         *out = vmw_bo;
 378
 379         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 380
 381         return 0;
 382
 383 err_unlock:
 384         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 385         return ret;
 386 }
 387
 388 int vmw_fb_init(struct vmw_private *vmw_priv)
 389 {
 390         struct device *device = &vmw_priv->dev->pdev->dev;
 391         struct vmw_fb_par *par;
 392         struct fb_info *info;
 393         unsigned initial_width, initial_height;
 394         unsigned fb_width, fb_height;
 395         unsigned fb_bbp, fb_depth, fb_offset, fb_pitch, fb_size;
 396         int ret;
 397
 398         initial_width = 800;
 399         initial_height = 600;
 400
 401         fb_bbp = 32;
 402         fb_depth = 24;
 403
 404         fb_width = min(vmw_priv->fb_max_width, (unsigned)2048);
 405         fb_height = min(vmw_priv->fb_max_height, (unsigned)2048);
 406
 407         initial_width = min(fb_width, initial_width);
 408         initial_height = min(fb_height, initial_height);
 409
 410         fb_pitch = fb_width * fb_bbp / 8;
 411         fb_size = fb_pitch * fb_height;
 412         fb_offset = vmw_read(vmw_priv, SVGA_REG_FB_OFFSET);
 413
 414         info = framebuffer_alloc(sizeof(*par), device);
 415         if (!info)
 416                 return -ENOMEM;
 417
 418         /*
 419          * Par
 420          */
 421         vmw_priv->fb_info = info;
 422         par = info->par;
 423         par->vmw_priv = vmw_priv;
 424         par->depth = fb_depth;
 425         par->bpp = fb_bbp;
 426         par->vmalloc = NULL;
 427         par->max_width = fb_width;
 428         par->max_height = fb_height;
 429
 430         /*
 431          * Create buffers and alloc memory
 432          */
 433         par->vmalloc = vmalloc(fb_size);
 434         if (unlikely(par->vmalloc == NULL)) {
 435                 ret = -ENOMEM;
 436                 goto err_free;
 437         }
 438
 439         ret = vmw_fb_create_bo(vmw_priv, fb_size, &par->vmw_bo);
 440         if (unlikely(ret != 0))
 441                 goto err_free;
 442
 443         ret = ttm_bo_kmap(&par->vmw_bo->base,
 444                           0,
 445                           par->vmw_bo->base.num_pages,
 446                           &par->map);
 447         if (unlikely(ret != 0))
 448                 goto err_unref;
 449         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &par->bo_iowrite);
 450         par->bo_size = fb_size;
 451
 452         /*
 453          * Fixed and var
 454          */
 455         strcpy(info->fix.id, "svgadrmfb");
 456         info->fix.type = FB_TYPE_PACKED_PIXELS;
 457         info->fix.visual = FB_VISUAL_TRUECOLOR;
 458         info->fix.type_aux = 0;
 459         info->fix.xpanstep = 1; /* doing it in hw */
 460         info->fix.ypanstep = 1; /* doing it in hw */
 461         info->fix.ywrapstep = 0;
 462         info->fix.accel = FB_ACCEL_NONE;
 463         info->fix.line_length = fb_pitch;
 464
 465         info->fix.smem_start = 0;
 466         info->fix.smem_len = fb_size;
 467
 468         info->fix.mmio_start = 0;
 469         info->fix.mmio_len = 0;
 470
 471         info->pseudo_palette = par->pseudo_palette;
 472         info->screen_base = par->vmalloc;
 473         info->screen_size = fb_size;
 474
 475         info->flags = FBINFO_DEFAULT;
 476         info->fbops = &vmw_fb_ops;
 477
 478         /* 24 depth per default */
 479         info->var.red.offset = 16;
 480         info->var.green.offset = 8;
 481         info->var.blue.offset = 0;
 482         info->var.red.length = 8;
 483         info->var.green.length = 8;
 484         info->var.blue.length = 8;
 485         info->var.transp.offset = 0;
 486         info->var.transp.length = 0;
 487
 488         info->var.xres_virtual = fb_width;
 489         info->var.yres_virtual = fb_height;
 490         info->var.bits_per_pixel = par->bpp;
 491         info->var.xoffset = 0;
 492         info->var.yoffset = 0;
 493         info->var.activate = FB_ACTIVATE_NOW;
 494         info->var.height = -1;
 495         info->var.width = -1;
 496
 497         info->var.xres = initial_width;
 498         info->var.yres = initial_height;
 499
 500         info->pixmap.size = 0;
 501         info->pixmap.buf_align = 8;
 502         info->pixmap.access_align = 32;
 503         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 504         info->pixmap.scan_align = 1;
 505
 506         info->apertures = alloc_apertures(1);
 507         if (!info->apertures) {
 508                 ret = -ENOMEM;
 509                 goto err_aper;
 510         }
 511         info->apertures->ranges[0].base = vmw_priv->vram_start;
 512         info->apertures->ranges[0].size = vmw_priv->vram_size;
 513
 514         /*
 515          * Dirty & Deferred IO
 516          */
 517         par->dirty.x1 = par->dirty.x2 = 0;
 518         par->dirty.y1 = par->dirty.y2 = 0;
 519         par->dirty.active = true;
 520         spin_lock_init(&par->dirty.lock);
 521         info->fbdefio = &vmw_defio;
 522         fb_deferred_io_init(info);
 523
 524         ret = register_framebuffer(info);
 525         if (unlikely(ret != 0))
 526                 goto err_defio;
 527
 528         return 0;
 529
 530 err_defio:
 531         fb_deferred_io_cleanup(info);
 532 err_aper:
 533         ttm_bo_kunmap(&par->map);
 534 err_unref:
 535         ttm_bo_unref((struct ttm_buffer_object **)&par->vmw_bo);
 536 err_free:
 537         vfree(par->vmalloc);
 538         framebuffer_release(info);
 539         vmw_priv->fb_info = NULL;
 540
 541         return ret;
 542 }
 543
 544 int vmw_fb_close(struct vmw_private *vmw_priv)
 545 {
 546         struct fb_info *info;
 547         struct vmw_fb_par *par;
 548         struct ttm_buffer_object *bo;
 549
 550         if (!vmw_priv->fb_info)
 551                 return 0;
 552
 553         info = vmw_priv->fb_info;
 554         par = info->par;
 555         bo = &par->vmw_bo->base;
 556         par->vmw_bo = NULL;
 557
 558         /* ??? order */
 559         fb_deferred_io_cleanup(info);
 560         unregister_framebuffer(info);
 561
 562         ttm_bo_kunmap(&par->map);
 563         ttm_bo_unref(&bo);
 564
 565         vfree(par->vmalloc);
 566         framebuffer_release(info);
 567
 568         return 0;
 569 }
 570
 571 int vmw_dmabuf_from_vram(struct vmw_private *vmw_priv,
 572                          struct vmw_dma_buffer *vmw_bo)
 573 {
 574         struct ttm_buffer_object *bo = &vmw_bo->base;
 575         int ret = 0;
 576
 577         ret = ttm_bo_reserve(bo, false, false, false, 0);
 578         if (unlikely(ret != 0))
 579                 return ret;
 580
 581         ret = ttm_bo_validate(bo, &vmw_sys_placement, false, false, false);
 582         ttm_bo_unreserve(bo);
 583
 584         return ret;
 585 }
 586
 587 int vmw_dmabuf_to_start_of_vram(struct vmw_private *vmw_priv,
 588                                 struct vmw_dma_buffer *vmw_bo)
 589 {
 590         struct ttm_buffer_object *bo = &vmw_bo->base;
 591         struct ttm_placement ne_placement = vmw_vram_ne_placement;
 592         int ret = 0;
 593
 594         ne_placement.lpfn = bo->num_pages;
 595
 596         /* interuptable? */
 597         ret = ttm_write_lock(&vmw_priv->active_master->lock, false);
 598         if (unlikely(ret != 0))
 599                 return ret;
 600
 601         ret = ttm_bo_reserve(bo, false, false, false, 0);
 602         if (unlikely(ret != 0))
 603                 goto err_unlock;
 604
 605         if (bo->mem.mem_type == TTM_PL_VRAM &&
 606             bo->mem.mm_node->start < bo->num_pages)
 607                 (void) ttm_bo_validate(bo, &vmw_sys_placement, false,
 608                                        false, false);
 609
 610         ret = ttm_bo_validate(bo, &ne_placement, false, false, false);
 611
 612         /* Could probably bug on */
 613         WARN_ON(bo->offset != 0);
 614
 615         ttm_bo_unreserve(bo);
 616 err_unlock:
 617         ttm_write_unlock(&vmw_priv->active_master->lock);
 618
 619         return ret;
 620 }
 621
 622 int vmw_fb_off(struct vmw_private *vmw_priv)
 623 {
 624         struct fb_info *info;
 625         struct vmw_fb_par *par;
 626         unsigned long flags;
 627
 628         if (!vmw_priv->fb_info)
 629                 return -EINVAL;
 630
 631         info = vmw_priv->fb_info;
 632         par = info->par;
 633
 634         spin_lock_irqsave(&par->dirty.lock, flags);
 635         par->dirty.active = false;
 636         spin_unlock_irqrestore(&par->dirty.lock, flags);
 637
 638         flush_scheduled_work();
 639
 640         par->bo_ptr = NULL;
 641         ttm_bo_kunmap(&par->map);
 642
 643         vmw_dmabuf_from_vram(vmw_priv, par->vmw_bo);
 644
 645         return 0;
 646 }
 647
 648 int vmw_fb_on(struct vmw_private *vmw_priv)
 649 {
 650         struct fb_info *info;
 651         struct vmw_fb_par *par;
 652         unsigned long flags;
 653         bool dummy;
 654         int ret;
 655
 656         if (!vmw_priv->fb_info)
 657                 return -EINVAL;
 658
 659         info = vmw_priv->fb_info;
 660         par = info->par;
 661
 662         /* we are already active */
 663         if (par->bo_ptr != NULL)
 664                 return 0;
 665
 666         /* Make sure that all overlays are stoped when we take over */
 667         vmw_overlay_stop_all(vmw_priv);
 668
 669         ret = vmw_dmabuf_to_start_of_vram(vmw_priv, par->vmw_bo);
 670         if (unlikely(ret != 0)) {
 671                 DRM_ERROR("could not move buffer to start of VRAM\n");
 672                 goto err_no_buffer;
 673         }
 674
 675         ret = ttm_bo_kmap(&par->vmw_bo->base,
 676                           0,
 677                           par->vmw_bo->base.num_pages,
 678                           &par->map);
 679         BUG_ON(ret != 0);
 680         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &dummy);
 681
 682         spin_lock_irqsave(&par->dirty.lock, flags);
 683         par->dirty.active = true;
 684         spin_unlock_irqrestore(&par->dirty.lock, flags);
 685
 686 err_no_buffer:
 687         vmw_fb_set_par(info);
 688
 689         vmw_fb_dirty_mark(par, 0, 0, info->var.xres, info->var.yres);
 690
 691         /* If there already was stuff dirty we wont
 692          * schedule a new work, so lets do it now */
 693         schedule_delayed_work(&info->deferred_work, 0);
 694
 695         return 0;
 696 }