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 #if 0
 227         DRM_INFO("%s, (%u, %u) (%ux%u)\n", __func__, x, y, w, h);
 228 #endif
 229
 230         cmd = vmw_fifo_reserve(vmw_priv, sizeof(*cmd));
 231         if (unlikely(cmd == NULL)) {
 232                 DRM_ERROR("Fifo reserve failed.\n");
 233                 return;
 234         }
 235
 236         cmd->header = cpu_to_le32(SVGA_CMD_UPDATE);
 237         cmd->body.x = cpu_to_le32(x);
 238         cmd->body.y = cpu_to_le32(y);
 239         cmd->body.width = cpu_to_le32(w);
 240         cmd->body.height = cpu_to_le32(h);
 241         vmw_fifo_commit(vmw_priv, sizeof(*cmd));
 242 }
 243
 244 static void vmw_fb_dirty_mark(struct vmw_fb_par *par,
 245                               unsigned x1, unsigned y1,
 246                               unsigned width, unsigned height)
 247 {
 248         struct fb_info *info = par->vmw_priv->fb_info;
 249         unsigned long flags;
 250         unsigned x2 = x1 + width;
 251         unsigned y2 = y1 + height;
 252
 253         spin_lock_irqsave(&par->dirty.lock, flags);
 254         if (par->dirty.x1 == par->dirty.x2) {
 255                 par->dirty.x1 = x1;
 256                 par->dirty.y1 = y1;
 257                 par->dirty.x2 = x2;
 258                 par->dirty.y2 = y2;
 259                 /* if we are active start the dirty work
 260                  * we share the work with the defio system */
 261                 if (par->dirty.active)
 262                         schedule_delayed_work(&info->deferred_work, VMW_DIRTY_DELAY);
 263         } else {
 264                 if (x1 < par->dirty.x1)
 265                         par->dirty.x1 = x1;
 266                 if (y1 < par->dirty.y1)
 267                         par->dirty.y1 = y1;
 268                 if (x2 > par->dirty.x2)
 269                         par->dirty.x2 = x2;
 270                 if (y2 > par->dirty.y2)
 271                         par->dirty.y2 = y2;
 272         }
 273         spin_unlock_irqrestore(&par->dirty.lock, flags);
 274 }
 275
 276 static void vmw_deferred_io(struct fb_info *info,
 277                             struct list_head *pagelist)
 278 {
 279         struct vmw_fb_par *par = info->par;
 280         unsigned long start, end, min, max;
 281         unsigned long flags;
 282         struct page *page;
 283         int y1, y2;
 284
 285         min = ULONG_MAX;
 286         max = 0;
 287         list_for_each_entry(page, pagelist, lru) {
 288                 start = page->index << PAGE_SHIFT;
 289                 end = start + PAGE_SIZE - 1;
 290                 min = min(min, start);
 291                 max = max(max, end);
 292         }
 293
 294         if (min < max) {
 295                 y1 = min / info->fix.line_length;
 296                 y2 = (max / info->fix.line_length) + 1;
 297
 298                 spin_lock_irqsave(&par->dirty.lock, flags);
 299                 par->dirty.x1 = 0;
 300                 par->dirty.y1 = y1;
 301                 par->dirty.x2 = info->var.xres;
 302                 par->dirty.y2 = y2;
 303                 spin_unlock_irqrestore(&par->dirty.lock, flags);
 304         }
 305
 306         vmw_fb_dirty_flush(par);
 307 };
 308
 309 struct fb_deferred_io vmw_defio = {
 310         .delay          = VMW_DIRTY_DELAY,
 311         .deferred_io    = vmw_deferred_io,
 312 };
 313
 314 /*
 315  * Draw code
 316  */
 317
 318 static void vmw_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 319 {
 320         cfb_fillrect(info, rect);
 321         vmw_fb_dirty_mark(info->par, rect->dx, rect->dy,
 322                           rect->width, rect->height);
 323 }
 324
 325 static void vmw_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
 326 {
 327         cfb_copyarea(info, region);
 328         vmw_fb_dirty_mark(info->par, region->dx, region->dy,
 329                           region->width, region->height);
 330 }
 331
 332 static void vmw_fb_imageblit(struct fb_info *info, const struct fb_image *image)
 333 {
 334         cfb_imageblit(info, image);
 335         vmw_fb_dirty_mark(info->par, image->dx, image->dy,
 336                           image->width, image->height);
 337 }
 338
 339 /*
 340  * Bring up code
 341  */
 342
 343 static struct fb_ops vmw_fb_ops = {
 344         .owner = THIS_MODULE,
 345         .fb_check_var = vmw_fb_check_var,
 346         .fb_set_par = vmw_fb_set_par,
 347         .fb_setcolreg = vmw_fb_setcolreg,
 348         .fb_fillrect = vmw_fb_fillrect,
 349         .fb_copyarea = vmw_fb_copyarea,
 350         .fb_imageblit = vmw_fb_imageblit,
 351         .fb_pan_display = vmw_fb_pan_display,
 352         .fb_blank = vmw_fb_blank,
 353 };
 354
 355 static int vmw_fb_create_bo(struct vmw_private *vmw_priv,
 356                             size_t size, struct vmw_dma_buffer **out)
 357 {
 358         struct vmw_dma_buffer *vmw_bo;
 359         struct ttm_placement ne_placement = vmw_vram_ne_placement;
 360         int ret;
 361
 362         ne_placement.lpfn = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 363
 364         /* interuptable? */
 365         ret = ttm_write_lock(&vmw_priv->fbdev_master.lock, false);
 366         if (unlikely(ret != 0))
 367                 return ret;
 368
 369         vmw_bo = kmalloc(sizeof(*vmw_bo), GFP_KERNEL);
 370         if (!vmw_bo)
 371                 goto err_unlock;
 372
 373         ret = vmw_dmabuf_init(vmw_priv, vmw_bo, size,
 374                               &ne_placement,
 375                               false,
 376                               &vmw_dmabuf_bo_free);
 377         if (unlikely(ret != 0))
 378                 goto err_unlock; /* init frees the buffer on failure */
 379
 380         *out = vmw_bo;
 381
 382         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 383
 384         return 0;
 385
 386 err_unlock:
 387         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 388         return ret;
 389 }
 390
 391 int vmw_fb_init(struct vmw_private *vmw_priv)
 392 {
 393         struct device *device = &vmw_priv->dev->pdev->dev;
 394         struct vmw_fb_par *par;
 395         struct fb_info *info;
 396         unsigned initial_width, initial_height;
 397         unsigned fb_width, fb_height;
 398         unsigned fb_bbp, fb_depth, fb_offset, fb_pitch, fb_size;
 399         int ret;
 400
 401         /* XXX These shouldn't be hardcoded. */
 402         initial_width = 800;
 403         initial_height = 600;
 404
 405         fb_bbp = 32;
 406         fb_depth = 24;
 407
 408         /* XXX As shouldn't these be as well. */
 409         fb_width = min(vmw_priv->fb_max_width, (unsigned)2048);
 410         fb_height = min(vmw_priv->fb_max_height, (unsigned)2048);
 411
 412         initial_width = min(fb_width, initial_width);
 413         initial_height = min(fb_height, initial_height);
 414
 415         fb_pitch = fb_width * fb_bbp / 8;
 416         fb_size = fb_pitch * fb_height;
 417         fb_offset = vmw_read(vmw_priv, SVGA_REG_FB_OFFSET);
 418
 419         info = framebuffer_alloc(sizeof(*par), device);
 420         if (!info)
 421                 return -ENOMEM;
 422
 423         /*
 424          * Par
 425          */
 426         vmw_priv->fb_info = info;
 427         par = info->par;
 428         par->vmw_priv = vmw_priv;
 429         par->depth = fb_depth;
 430         par->bpp = fb_bbp;
 431         par->vmalloc = NULL;
 432         par->max_width = fb_width;
 433         par->max_height = fb_height;
 434
 435         /*
 436          * Create buffers and alloc memory
 437          */
 438         par->vmalloc = vmalloc(fb_size);
 439         if (unlikely(par->vmalloc == NULL)) {
 440                 ret = -ENOMEM;
 441                 goto err_free;
 442         }
 443
 444         ret = vmw_fb_create_bo(vmw_priv, fb_size, &par->vmw_bo);
 445         if (unlikely(ret != 0))
 446                 goto err_free;
 447
 448         ret = ttm_bo_kmap(&par->vmw_bo->base,
 449                           0,
 450                           par->vmw_bo->base.num_pages,
 451                           &par->map);
 452         if (unlikely(ret != 0))
 453                 goto err_unref;
 454         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &par->bo_iowrite);
 455         par->bo_size = fb_size;
 456
 457         /*
 458          * Fixed and var
 459          */
 460         strcpy(info->fix.id, "svgadrmfb");
 461         info->fix.type = FB_TYPE_PACKED_PIXELS;
 462         info->fix.visual = FB_VISUAL_TRUECOLOR;
 463         info->fix.type_aux = 0;
 464         info->fix.xpanstep = 1; /* doing it in hw */
 465         info->fix.ypanstep = 1; /* doing it in hw */
 466         info->fix.ywrapstep = 0;
 467         info->fix.accel = FB_ACCEL_NONE;
 468         info->fix.line_length = fb_pitch;
 469
 470         info->fix.smem_start = 0;
 471         info->fix.smem_len = fb_size;
 472
 473         info->fix.mmio_start = 0;
 474         info->fix.mmio_len = 0;
 475
 476         info->pseudo_palette = par->pseudo_palette;
 477         info->screen_base = par->vmalloc;
 478         info->screen_size = fb_size;
 479
 480         info->flags = FBINFO_DEFAULT;
 481         info->fbops = &vmw_fb_ops;
 482
 483         /* 24 depth per default */
 484         info->var.red.offset = 16;
 485         info->var.green.offset = 8;
 486         info->var.blue.offset = 0;
 487         info->var.red.length = 8;
 488         info->var.green.length = 8;
 489         info->var.blue.length = 8;
 490         info->var.transp.offset = 0;
 491         info->var.transp.length = 0;
 492
 493         info->var.xres_virtual = fb_width;
 494         info->var.yres_virtual = fb_height;
 495         info->var.bits_per_pixel = par->bpp;
 496         info->var.xoffset = 0;
 497         info->var.yoffset = 0;
 498         info->var.activate = FB_ACTIVATE_NOW;
 499         info->var.height = -1;
 500         info->var.width = -1;
 501
 502         info->var.xres = initial_width;
 503         info->var.yres = initial_height;
 504
 505 #if 0
 506         info->pixmap.size = 64*1024;
 507         info->pixmap.buf_align = 8;
 508         info->pixmap.access_align = 32;
 509         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 510         info->pixmap.scan_align = 1;
 511 #else
 512         info->pixmap.size = 0;
 513         info->pixmap.buf_align = 8;
 514         info->pixmap.access_align = 32;
 515         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 516         info->pixmap.scan_align = 1;
 517 #endif
 518
 519         info->apertures = alloc_apertures(1);
 520         if (!info->apertures) {
 521                 ret = -ENOMEM;
 522                 goto err_aper;
 523         }
 524         info->apertures->ranges[0].base = vmw_priv->vram_start;
 525         info->apertures->ranges[0].size = vmw_priv->vram_size;
 526
 527         /*
 528          * Dirty & Deferred IO
 529          */
 530         par->dirty.x1 = par->dirty.x2 = 0;
 531         par->dirty.y1 = par->dirty.y1 = 0;
 532         par->dirty.active = true;
 533         spin_lock_init(&par->dirty.lock);
 534         info->fbdefio = &vmw_defio;
 535         fb_deferred_io_init(info);
 536
 537         ret = register_framebuffer(info);
 538         if (unlikely(ret != 0))
 539                 goto err_defio;
 540
 541         return 0;
 542
 543 err_defio:
 544         fb_deferred_io_cleanup(info);
 545 err_aper:
 546         ttm_bo_kunmap(&par->map);
 547 err_unref:
 548         ttm_bo_unref((struct ttm_buffer_object **)&par->vmw_bo);
 549 err_free:
 550         vfree(par->vmalloc);
 551         framebuffer_release(info);
 552         vmw_priv->fb_info = NULL;
 553
 554         return ret;
 555 }
 556
 557 int vmw_fb_close(struct vmw_private *vmw_priv)
 558 {
 559         struct fb_info *info;
 560         struct vmw_fb_par *par;
 561         struct ttm_buffer_object *bo;
 562
 563         if (!vmw_priv->fb_info)
 564                 return 0;
 565
 566         info = vmw_priv->fb_info;
 567         par = info->par;
 568         bo = &par->vmw_bo->base;
 569         par->vmw_bo = NULL;
 570
 571         /* ??? order */
 572         fb_deferred_io_cleanup(info);
 573         unregister_framebuffer(info);
 574
 575         ttm_bo_kunmap(&par->map);
 576         ttm_bo_unref(&bo);
 577
 578         vfree(par->vmalloc);
 579         framebuffer_release(info);
 580
 581         return 0;
 582 }
 583
 584 int vmw_dmabuf_from_vram(struct vmw_private *vmw_priv,
 585                          struct vmw_dma_buffer *vmw_bo)
 586 {
 587         struct ttm_buffer_object *bo = &vmw_bo->base;
 588         int ret = 0;
 589
 590         ret = ttm_bo_reserve(bo, false, false, false, 0);
 591         if (unlikely(ret != 0))
 592                 return ret;
 593
 594         ret = ttm_bo_validate(bo, &vmw_sys_placement, false, false, false);
 595         ttm_bo_unreserve(bo);
 596
 597         return ret;
 598 }
 599
 600 int vmw_dmabuf_to_start_of_vram(struct vmw_private *vmw_priv,
 601                                 struct vmw_dma_buffer *vmw_bo)
 602 {
 603         struct ttm_buffer_object *bo = &vmw_bo->base;
 604         struct ttm_placement ne_placement = vmw_vram_ne_placement;
 605         int ret = 0;
 606
 607         ne_placement.lpfn = bo->num_pages;
 608
 609         /* interuptable? */
 610         ret = ttm_write_lock(&vmw_priv->active_master->lock, false);
 611         if (unlikely(ret != 0))
 612                 return ret;
 613
 614         ret = ttm_bo_reserve(bo, false, false, false, 0);
 615         if (unlikely(ret != 0))
 616                 goto err_unlock;
 617
 618         ret = ttm_bo_validate(bo, &ne_placement, false, false, false);
 619
 620         /* Could probably bug on */
 621         WARN_ON(bo->offset != 0);
 622
 623         ttm_bo_unreserve(bo);
 624 err_unlock:
 625         ttm_write_unlock(&vmw_priv->active_master->lock);
 626
 627         return ret;
 628 }
 629
 630 int vmw_fb_off(struct vmw_private *vmw_priv)
 631 {
 632         struct fb_info *info;
 633         struct vmw_fb_par *par;
 634         unsigned long flags;
 635
 636         if (!vmw_priv->fb_info)
 637                 return -EINVAL;
 638
 639         info = vmw_priv->fb_info;
 640         par = info->par;
 641
 642         spin_lock_irqsave(&par->dirty.lock, flags);
 643         par->dirty.active = false;
 644         spin_unlock_irqrestore(&par->dirty.lock, flags);
 645
 646         flush_scheduled_work();
 647
 648         par->bo_ptr = NULL;
 649         ttm_bo_kunmap(&par->map);
 650
 651         vmw_dmabuf_from_vram(vmw_priv, par->vmw_bo);
 652
 653         return 0;
 654 }
 655
 656 int vmw_fb_on(struct vmw_private *vmw_priv)
 657 {
 658         struct fb_info *info;
 659         struct vmw_fb_par *par;
 660         unsigned long flags;
 661         bool dummy;
 662         int ret;
 663
 664         if (!vmw_priv->fb_info)
 665                 return -EINVAL;
 666
 667         info = vmw_priv->fb_info;
 668         par = info->par;
 669
 670         /* we are already active */
 671         if (par->bo_ptr != NULL)
 672                 return 0;
 673
 674         /* Make sure that all overlays are stoped when we take over */
 675         vmw_overlay_stop_all(vmw_priv);
 676
 677         ret = vmw_dmabuf_to_start_of_vram(vmw_priv, par->vmw_bo);
 678         if (unlikely(ret != 0)) {
 679                 DRM_ERROR("could not move buffer to start of VRAM\n");
 680                 goto err_no_buffer;
 681         }
 682
 683         ret = ttm_bo_kmap(&par->vmw_bo->base,
 684                           0,
 685                           par->vmw_bo->base.num_pages,
 686                           &par->map);
 687         BUG_ON(ret != 0);
 688         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &dummy);
 689
 690         spin_lock_irqsave(&par->dirty.lock, flags);
 691         par->dirty.active = true;
 692         spin_unlock_irqrestore(&par->dirty.lock, flags);
 693
 694 err_no_buffer:
 695         vmw_fb_set_par(info);
 696
 697         vmw_fb_dirty_mark(par, 0, 0, info->var.xres, info->var.yres);
 698
 699         /* If there already was stuff dirty we wont
 700          * schedule a new work, so lets do it now */
 701         schedule_delayed_work(&info->deferred_work, 0);
 702
 703         return 0;
 704 }