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         if (!vmw_kms_validate_mode_vram(vmw_priv,
 148                                         info->fix.line_length,
 149                                         var->yoffset + var->yres)) {
 150                 DRM_ERROR("Requested geom can not fit in framebuffer\n");
 151                 return -EINVAL;
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int vmw_fb_set_par(struct fb_info *info)
 158 {
 159         struct vmw_fb_par *par = info->par;
 160         struct vmw_private *vmw_priv = par->vmw_priv;
 161         int ret;
 162
 163         ret = vmw_kms_write_svga(vmw_priv, info->var.xres, info->var.yres,
 164                                  info->fix.line_length,
 165                                  par->bpp, par->depth);
 166         if (ret)
 167                 return ret;
 168
 169         if (vmw_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY) {
 170                 /* TODO check if pitch and offset changes */
 171                 vmw_write(vmw_priv, SVGA_REG_NUM_GUEST_DISPLAYS, 1);
 172                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, 0);
 173                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_IS_PRIMARY, true);
 174                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_X, info->var.xoffset);
 175                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_Y, info->var.yoffset);
 176                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_WIDTH, info->var.xres);
 177                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_HEIGHT, info->var.yres);
 178                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID);
 179         }
 180
 181         /* This is really helpful since if this fails the user
 182          * can probably not see anything on the screen.
 183          */
 184         WARN_ON(vmw_read(vmw_priv, SVGA_REG_FB_OFFSET) != 0);
 185
 186         return 0;
 187 }
 188
 189 static int vmw_fb_pan_display(struct fb_var_screeninfo *var,
 190                               struct fb_info *info)
 191 {
 192         return 0;
 193 }
 194
 195 static int vmw_fb_blank(int blank, struct fb_info *info)
 196 {
 197         return 0;
 198 }
 199
 200 /*
 201  * Dirty code
 202  */
 203
 204 static void vmw_fb_dirty_flush(struct vmw_fb_par *par)
 205 {
 206         struct vmw_private *vmw_priv = par->vmw_priv;
 207         struct fb_info *info = vmw_priv->fb_info;
 208         int stride = (info->fix.line_length / 4);
 209         int *src = (int *)info->screen_base;
 210         __le32 __iomem *vram_mem = par->bo_ptr;
 211         unsigned long flags;
 212         unsigned x, y, w, h;
 213         int i, k;
 214         struct {
 215                 uint32_t header;
 216                 SVGAFifoCmdUpdate body;
 217         } *cmd;
 218
 219         if (vmw_priv->suspended)
 220                 return;
 221
 222         spin_lock_irqsave(&par->dirty.lock, flags);
 223         if (!par->dirty.active) {
 224                 spin_unlock_irqrestore(&par->dirty.lock, flags);
 225                 return;
 226         }
 227         x = par->dirty.x1;
 228         y = par->dirty.y1;
 229         w = min(par->dirty.x2, info->var.xres) - x;
 230         h = min(par->dirty.y2, info->var.yres) - y;
 231         par->dirty.x1 = par->dirty.x2 = 0;
 232         par->dirty.y1 = par->dirty.y2 = 0;
 233         spin_unlock_irqrestore(&par->dirty.lock, flags);
 234
 235         for (i = y * stride; i < info->fix.smem_len / 4; i += stride) {
 236                 for (k = i+x; k < i+x+w && k < info->fix.smem_len / 4; k++)
 237                         iowrite32(src[k], vram_mem + k);
 238         }
 239
 240 #if 0
 241         DRM_INFO("%s, (%u, %u) (%ux%u)\n", __func__, x, y, w, h);
 242 #endif
 243
 244         cmd = vmw_fifo_reserve(vmw_priv, sizeof(*cmd));
 245         if (unlikely(cmd == NULL)) {
 246                 DRM_ERROR("Fifo reserve failed.\n");
 247                 return;
 248         }
 249
 250         cmd->header = cpu_to_le32(SVGA_CMD_UPDATE);
 251         cmd->body.x = cpu_to_le32(x);
 252         cmd->body.y = cpu_to_le32(y);
 253         cmd->body.width = cpu_to_le32(w);
 254         cmd->body.height = cpu_to_le32(h);
 255         vmw_fifo_commit(vmw_priv, sizeof(*cmd));
 256 }
 257
 258 static void vmw_fb_dirty_mark(struct vmw_fb_par *par,
 259                               unsigned x1, unsigned y1,
 260                               unsigned width, unsigned height)
 261 {
 262         struct fb_info *info = par->vmw_priv->fb_info;
 263         unsigned long flags;
 264         unsigned x2 = x1 + width;
 265         unsigned y2 = y1 + height;
 266
 267         spin_lock_irqsave(&par->dirty.lock, flags);
 268         if (par->dirty.x1 == par->dirty.x2) {
 269                 par->dirty.x1 = x1;
 270                 par->dirty.y1 = y1;
 271                 par->dirty.x2 = x2;
 272                 par->dirty.y2 = y2;
 273                 /* if we are active start the dirty work
 274                  * we share the work with the defio system */
 275                 if (par->dirty.active)
 276                         schedule_delayed_work(&info->deferred_work, VMW_DIRTY_DELAY);
 277         } else {
 278                 if (x1 < par->dirty.x1)
 279                         par->dirty.x1 = x1;
 280                 if (y1 < par->dirty.y1)
 281                         par->dirty.y1 = y1;
 282                 if (x2 > par->dirty.x2)
 283                         par->dirty.x2 = x2;
 284                 if (y2 > par->dirty.y2)
 285                         par->dirty.y2 = y2;
 286         }
 287         spin_unlock_irqrestore(&par->dirty.lock, flags);
 288 }
 289
 290 static void vmw_deferred_io(struct fb_info *info,
 291                             struct list_head *pagelist)
 292 {
 293         struct vmw_fb_par *par = info->par;
 294         unsigned long start, end, min, max;
 295         unsigned long flags;
 296         struct page *page;
 297         int y1, y2;
 298
 299         min = ULONG_MAX;
 300         max = 0;
 301         list_for_each_entry(page, pagelist, lru) {
 302                 start = page->index << PAGE_SHIFT;
 303                 end = start + PAGE_SIZE - 1;
 304                 min = min(min, start);
 305                 max = max(max, end);
 306         }
 307
 308         if (min < max) {
 309                 y1 = min / info->fix.line_length;
 310                 y2 = (max / info->fix.line_length) + 1;
 311
 312                 spin_lock_irqsave(&par->dirty.lock, flags);
 313                 par->dirty.x1 = 0;
 314                 par->dirty.y1 = y1;
 315                 par->dirty.x2 = info->var.xres;
 316                 par->dirty.y2 = y2;
 317                 spin_unlock_irqrestore(&par->dirty.lock, flags);
 318         }
 319
 320         vmw_fb_dirty_flush(par);
 321 };
 322
 323 struct fb_deferred_io vmw_defio = {
 324         .delay          = VMW_DIRTY_DELAY,
 325         .deferred_io    = vmw_deferred_io,
 326 };
 327
 328 /*
 329  * Draw code
 330  */
 331
 332 static void vmw_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 333 {
 334         cfb_fillrect(info, rect);
 335         vmw_fb_dirty_mark(info->par, rect->dx, rect->dy,
 336                           rect->width, rect->height);
 337 }
 338
 339 static void vmw_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
 340 {
 341         cfb_copyarea(info, region);
 342         vmw_fb_dirty_mark(info->par, region->dx, region->dy,
 343                           region->width, region->height);
 344 }
 345
 346 static void vmw_fb_imageblit(struct fb_info *info, const struct fb_image *image)
 347 {
 348         cfb_imageblit(info, image);
 349         vmw_fb_dirty_mark(info->par, image->dx, image->dy,
 350                           image->width, image->height);
 351 }
 352
 353 /*
 354  * Bring up code
 355  */
 356
 357 static struct fb_ops vmw_fb_ops = {
 358         .owner = THIS_MODULE,
 359         .fb_check_var = vmw_fb_check_var,
 360         .fb_set_par = vmw_fb_set_par,
 361         .fb_setcolreg = vmw_fb_setcolreg,
 362         .fb_fillrect = vmw_fb_fillrect,
 363         .fb_copyarea = vmw_fb_copyarea,
 364         .fb_imageblit = vmw_fb_imageblit,
 365         .fb_pan_display = vmw_fb_pan_display,
 366         .fb_blank = vmw_fb_blank,
 367 };
 368
 369 static int vmw_fb_create_bo(struct vmw_private *vmw_priv,
 370                             size_t size, struct vmw_dma_buffer **out)
 371 {
 372         struct vmw_dma_buffer *vmw_bo;
 373         struct ttm_placement ne_placement = vmw_vram_ne_placement;
 374         int ret;
 375
 376         ne_placement.lpfn = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 377
 378         /* interuptable? */
 379         ret = ttm_write_lock(&vmw_priv->fbdev_master.lock, false);
 380         if (unlikely(ret != 0))
 381                 return ret;
 382
 383         vmw_bo = kmalloc(sizeof(*vmw_bo), GFP_KERNEL);
 384         if (!vmw_bo)
 385                 goto err_unlock;
 386
 387         ret = vmw_dmabuf_init(vmw_priv, vmw_bo, size,
 388                               &ne_placement,
 389                               false,
 390                               &vmw_dmabuf_bo_free);
 391         if (unlikely(ret != 0))
 392                 goto err_unlock; /* init frees the buffer on failure */
 393
 394         *out = vmw_bo;
 395
 396         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 397
 398         return 0;
 399
 400 err_unlock:
 401         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 402         return ret;
 403 }
 404
 405 int vmw_fb_init(struct vmw_private *vmw_priv)
 406 {
 407         struct device *device = &vmw_priv->dev->pdev->dev;
 408         struct vmw_fb_par *par;
 409         struct fb_info *info;
 410         unsigned initial_width, initial_height;
 411         unsigned fb_width, fb_height;
 412         unsigned fb_bpp, fb_depth, fb_offset, fb_pitch, fb_size;
 413         int ret;
 414
 415         /* XXX These shouldn't be hardcoded. */
 416         initial_width = 800;
 417         initial_height = 600;
 418
 419         fb_bpp = 32;
 420         fb_depth = 24;
 421
 422         /* XXX As shouldn't these be as well. */
 423         fb_width = min(vmw_priv->fb_max_width, (unsigned)2048);
 424         fb_height = min(vmw_priv->fb_max_height, (unsigned)2048);
 425
 426         initial_width = min(fb_width, initial_width);
 427         initial_height = min(fb_height, initial_height);
 428
 429         fb_pitch = fb_width * fb_bpp / 8;
 430         fb_size = fb_pitch * fb_height;
 431         fb_offset = vmw_read(vmw_priv, SVGA_REG_FB_OFFSET);
 432
 433         info = framebuffer_alloc(sizeof(*par), device);
 434         if (!info)
 435                 return -ENOMEM;
 436
 437         /*
 438          * Par
 439          */
 440         vmw_priv->fb_info = info;
 441         par = info->par;
 442         par->vmw_priv = vmw_priv;
 443         par->depth = fb_depth;
 444         par->bpp = fb_bpp;
 445         par->vmalloc = NULL;
 446         par->max_width = fb_width;
 447         par->max_height = fb_height;
 448
 449         /*
 450          * Create buffers and alloc memory
 451          */
 452         par->vmalloc = vmalloc(fb_size);
 453         if (unlikely(par->vmalloc == NULL)) {
 454                 ret = -ENOMEM;
 455                 goto err_free;
 456         }
 457
 458         ret = vmw_fb_create_bo(vmw_priv, fb_size, &par->vmw_bo);
 459         if (unlikely(ret != 0))
 460                 goto err_free;
 461
 462         ret = ttm_bo_kmap(&par->vmw_bo->base,
 463                           0,
 464                           par->vmw_bo->base.num_pages,
 465                           &par->map);
 466         if (unlikely(ret != 0))
 467                 goto err_unref;
 468         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &par->bo_iowrite);
 469         par->bo_size = fb_size;
 470
 471         /*
 472          * Fixed and var
 473          */
 474         strcpy(info->fix.id, "svgadrmfb");
 475         info->fix.type = FB_TYPE_PACKED_PIXELS;
 476         info->fix.visual = FB_VISUAL_TRUECOLOR;
 477         info->fix.type_aux = 0;
 478         info->fix.xpanstep = 1; /* doing it in hw */
 479         info->fix.ypanstep = 1; /* doing it in hw */
 480         info->fix.ywrapstep = 0;
 481         info->fix.accel = FB_ACCEL_NONE;
 482         info->fix.line_length = fb_pitch;
 483
 484         info->fix.smem_start = 0;
 485         info->fix.smem_len = fb_size;
 486
 487         info->pseudo_palette = par->pseudo_palette;
 488         info->screen_base = par->vmalloc;
 489         info->screen_size = fb_size;
 490
 491         info->flags = FBINFO_DEFAULT;
 492         info->fbops = &vmw_fb_ops;
 493
 494         /* 24 depth per default */
 495         info->var.red.offset = 16;
 496         info->var.green.offset = 8;
 497         info->var.blue.offset = 0;
 498         info->var.red.length = 8;
 499         info->var.green.length = 8;
 500         info->var.blue.length = 8;
 501         info->var.transp.offset = 0;
 502         info->var.transp.length = 0;
 503
 504         info->var.xres_virtual = fb_width;
 505         info->var.yres_virtual = fb_height;
 506         info->var.bits_per_pixel = par->bpp;
 507         info->var.xoffset = 0;
 508         info->var.yoffset = 0;
 509         info->var.activate = FB_ACTIVATE_NOW;
 510         info->var.height = -1;
 511         info->var.width = -1;
 512
 513         info->var.xres = initial_width;
 514         info->var.yres = initial_height;
 515
 516 #if 0
 517         info->pixmap.size = 64*1024;
 518         info->pixmap.buf_align = 8;
 519         info->pixmap.access_align = 32;
 520         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 521         info->pixmap.scan_align = 1;
 522 #else
 523         info->pixmap.size = 0;
 524         info->pixmap.buf_align = 8;
 525         info->pixmap.access_align = 32;
 526         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 527         info->pixmap.scan_align = 1;
 528 #endif
 529
 530         info->apertures = alloc_apertures(1);
 531         if (!info->apertures) {
 532                 ret = -ENOMEM;
 533                 goto err_aper;
 534         }
 535         info->apertures->ranges[0].base = vmw_priv->vram_start;
 536         info->apertures->ranges[0].size = vmw_priv->vram_size;
 537
 538         /*
 539          * Dirty & Deferred IO
 540          */
 541         par->dirty.x1 = par->dirty.x2 = 0;
 542         par->dirty.y1 = par->dirty.y2 = 0;
 543         par->dirty.active = true;
 544         spin_lock_init(&par->dirty.lock);
 545         info->fbdefio = &vmw_defio;
 546         fb_deferred_io_init(info);
 547
 548         ret = register_framebuffer(info);
 549         if (unlikely(ret != 0))
 550                 goto err_defio;
 551
 552         return 0;
 553
 554 err_defio:
 555         fb_deferred_io_cleanup(info);
 556 err_aper:
 557         ttm_bo_kunmap(&par->map);
 558 err_unref:
 559         ttm_bo_unref((struct ttm_buffer_object **)&par->vmw_bo);
 560 err_free:
 561         vfree(par->vmalloc);
 562         framebuffer_release(info);
 563         vmw_priv->fb_info = NULL;
 564
 565         return ret;
 566 }
 567
 568 int vmw_fb_close(struct vmw_private *vmw_priv)
 569 {
 570         struct fb_info *info;
 571         struct vmw_fb_par *par;
 572         struct ttm_buffer_object *bo;
 573
 574         if (!vmw_priv->fb_info)
 575                 return 0;
 576
 577         info = vmw_priv->fb_info;
 578         par = info->par;
 579         bo = &par->vmw_bo->base;
 580         par->vmw_bo = NULL;
 581
 582         /* ??? order */
 583         fb_deferred_io_cleanup(info);
 584         unregister_framebuffer(info);
 585
 586         ttm_bo_kunmap(&par->map);
 587         ttm_bo_unref(&bo);
 588
 589         vfree(par->vmalloc);
 590         framebuffer_release(info);
 591
 592         return 0;
 593 }
 594
 595 int vmw_fb_off(struct vmw_private *vmw_priv)
 596 {
 597         struct fb_info *info;
 598         struct vmw_fb_par *par;
 599         unsigned long flags;
 600
 601         if (!vmw_priv->fb_info)
 602                 return -EINVAL;
 603
 604         info = vmw_priv->fb_info;
 605         par = info->par;
 606
 607         spin_lock_irqsave(&par->dirty.lock, flags);
 608         par->dirty.active = false;
 609         spin_unlock_irqrestore(&par->dirty.lock, flags);
 610
 611         flush_delayed_work_sync(&info->deferred_work);
 612
 613         par->bo_ptr = NULL;
 614         ttm_bo_kunmap(&par->map);
 615
 616         vmw_dmabuf_unpin(vmw_priv, par->vmw_bo, false);
 617
 618         return 0;
 619 }
 620
 621 int vmw_fb_on(struct vmw_private *vmw_priv)
 622 {
 623         struct fb_info *info;
 624         struct vmw_fb_par *par;
 625         unsigned long flags;
 626         bool dummy;
 627         int ret;
 628
 629         if (!vmw_priv->fb_info)
 630                 return -EINVAL;
 631
 632         info = vmw_priv->fb_info;
 633         par = info->par;
 634
 635         /* we are already active */
 636         if (par->bo_ptr != NULL)
 637                 return 0;
 638
 639         /* Make sure that all overlays are stoped when we take over */
 640         vmw_overlay_stop_all(vmw_priv);
 641
 642         ret = vmw_dmabuf_to_start_of_vram(vmw_priv, par->vmw_bo, true, false);
 643         if (unlikely(ret != 0)) {
 644                 DRM_ERROR("could not move buffer to start of VRAM\n");
 645                 goto err_no_buffer;
 646         }
 647
 648         ret = ttm_bo_kmap(&par->vmw_bo->base,
 649                           0,
 650                           par->vmw_bo->base.num_pages,
 651                           &par->map);
 652         BUG_ON(ret != 0);
 653         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &dummy);
 654
 655         spin_lock_irqsave(&par->dirty.lock, flags);
 656         par->dirty.active = true;
 657         spin_unlock_irqrestore(&par->dirty.lock, flags);
 658
 659 err_no_buffer:
 660         vmw_fb_set_par(info);
 661
 662         vmw_fb_dirty_mark(par, 0, 0, info->var.xres, info->var.yres);
 663
 664         /* If there already was stuff dirty we wont
 665          * schedule a new work, so lets do it now */
 666         schedule_delayed_work(&info->deferred_work, 0);
 667
 668         return 0;
 669 }