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
 162         vmw_kms_write_svga(vmw_priv, info->var.xres, info->var.yres,
 163                            info->fix.line_length,
 164                            par->bpp, par->depth);
 165         if (vmw_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY) {
 166                 /* TODO check if pitch and offset changes */
 167                 vmw_write(vmw_priv, SVGA_REG_NUM_GUEST_DISPLAYS, 1);
 168                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, 0);
 169                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_IS_PRIMARY, true);
 170                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_X, info->var.xoffset);
 171                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_Y, info->var.yoffset);
 172                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_WIDTH, info->var.xres);
 173                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_HEIGHT, info->var.yres);
 174                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID);
 175         }
 176
 177         /* This is really helpful since if this fails the user
 178          * can probably not see anything on the screen.
 179          */
 180         WARN_ON(vmw_read(vmw_priv, SVGA_REG_FB_OFFSET) != 0);
 181
 182         return 0;
 183 }
 184
 185 static int vmw_fb_pan_display(struct fb_var_screeninfo *var,
 186                               struct fb_info *info)
 187 {
 188         return 0;
 189 }
 190
 191 static int vmw_fb_blank(int blank, struct fb_info *info)
 192 {
 193         return 0;
 194 }
 195
 196 /*
 197  * Dirty code
 198  */
 199
 200 static void vmw_fb_dirty_flush(struct vmw_fb_par *par)
 201 {
 202         struct vmw_private *vmw_priv = par->vmw_priv;
 203         struct fb_info *info = vmw_priv->fb_info;
 204         int stride = (info->fix.line_length / 4);
 205         int *src = (int *)info->screen_base;
 206         __le32 __iomem *vram_mem = par->bo_ptr;
 207         unsigned long flags;
 208         unsigned x, y, w, h;
 209         int i, k;
 210         struct {
 211                 uint32_t header;
 212                 SVGAFifoCmdUpdate body;
 213         } *cmd;
 214
 215         spin_lock_irqsave(&par->dirty.lock, flags);
 216         if (!par->dirty.active) {
 217                 spin_unlock_irqrestore(&par->dirty.lock, flags);
 218                 return;
 219         }
 220         x = par->dirty.x1;
 221         y = par->dirty.y1;
 222         w = min(par->dirty.x2, info->var.xres) - x;
 223         h = min(par->dirty.y2, info->var.yres) - y;
 224         par->dirty.x1 = par->dirty.x2 = 0;
 225         par->dirty.y1 = par->dirty.y2 = 0;
 226         spin_unlock_irqrestore(&par->dirty.lock, flags);
 227
 228         for (i = y * stride; i < info->fix.smem_len / 4; i += stride) {
 229                 for (k = i+x; k < i+x+w && k < info->fix.smem_len / 4; k++)
 230                         iowrite32(src[k], vram_mem + k);
 231         }
 232
 233 #if 0
 234         DRM_INFO("%s, (%u, %u) (%ux%u)\n", __func__, x, y, w, h);
 235 #endif
 236
 237         cmd = vmw_fifo_reserve(vmw_priv, sizeof(*cmd));
 238         if (unlikely(cmd == NULL)) {
 239                 DRM_ERROR("Fifo reserve failed.\n");
 240                 return;
 241         }
 242
 243         cmd->header = cpu_to_le32(SVGA_CMD_UPDATE);
 244         cmd->body.x = cpu_to_le32(x);
 245         cmd->body.y = cpu_to_le32(y);
 246         cmd->body.width = cpu_to_le32(w);
 247         cmd->body.height = cpu_to_le32(h);
 248         vmw_fifo_commit(vmw_priv, sizeof(*cmd));
 249 }
 250
 251 static void vmw_fb_dirty_mark(struct vmw_fb_par *par,
 252                               unsigned x1, unsigned y1,
 253                               unsigned width, unsigned height)
 254 {
 255         struct fb_info *info = par->vmw_priv->fb_info;
 256         unsigned long flags;
 257         unsigned x2 = x1 + width;
 258         unsigned y2 = y1 + height;
 259
 260         spin_lock_irqsave(&par->dirty.lock, flags);
 261         if (par->dirty.x1 == par->dirty.x2) {
 262                 par->dirty.x1 = x1;
 263                 par->dirty.y1 = y1;
 264                 par->dirty.x2 = x2;
 265                 par->dirty.y2 = y2;
 266                 /* if we are active start the dirty work
 267                  * we share the work with the defio system */
 268                 if (par->dirty.active)
 269                         schedule_delayed_work(&info->deferred_work, VMW_DIRTY_DELAY);
 270         } else {
 271                 if (x1 < par->dirty.x1)
 272                         par->dirty.x1 = x1;
 273                 if (y1 < par->dirty.y1)
 274                         par->dirty.y1 = y1;
 275                 if (x2 > par->dirty.x2)
 276                         par->dirty.x2 = x2;
 277                 if (y2 > par->dirty.y2)
 278                         par->dirty.y2 = y2;
 279         }
 280         spin_unlock_irqrestore(&par->dirty.lock, flags);
 281 }
 282
 283 static void vmw_deferred_io(struct fb_info *info,
 284                             struct list_head *pagelist)
 285 {
 286         struct vmw_fb_par *par = info->par;
 287         unsigned long start, end, min, max;
 288         unsigned long flags;
 289         struct page *page;
 290         int y1, y2;
 291
 292         min = ULONG_MAX;
 293         max = 0;
 294         list_for_each_entry(page, pagelist, lru) {
 295                 start = page->index << PAGE_SHIFT;
 296                 end = start + PAGE_SIZE - 1;
 297                 min = min(min, start);
 298                 max = max(max, end);
 299         }
 300
 301         if (min < max) {
 302                 y1 = min / info->fix.line_length;
 303                 y2 = (max / info->fix.line_length) + 1;
 304
 305                 spin_lock_irqsave(&par->dirty.lock, flags);
 306                 par->dirty.x1 = 0;
 307                 par->dirty.y1 = y1;
 308                 par->dirty.x2 = info->var.xres;
 309                 par->dirty.y2 = y2;
 310                 spin_unlock_irqrestore(&par->dirty.lock, flags);
 311         }
 312
 313         vmw_fb_dirty_flush(par);
 314 };
 315
 316 struct fb_deferred_io vmw_defio = {
 317         .delay          = VMW_DIRTY_DELAY,
 318         .deferred_io    = vmw_deferred_io,
 319 };
 320
 321 /*
 322  * Draw code
 323  */
 324
 325 static void vmw_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 326 {
 327         cfb_fillrect(info, rect);
 328         vmw_fb_dirty_mark(info->par, rect->dx, rect->dy,
 329                           rect->width, rect->height);
 330 }
 331
 332 static void vmw_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
 333 {
 334         cfb_copyarea(info, region);
 335         vmw_fb_dirty_mark(info->par, region->dx, region->dy,
 336                           region->width, region->height);
 337 }
 338
 339 static void vmw_fb_imageblit(struct fb_info *info, const struct fb_image *image)
 340 {
 341         cfb_imageblit(info, image);
 342         vmw_fb_dirty_mark(info->par, image->dx, image->dy,
 343                           image->width, image->height);
 344 }
 345
 346 /*
 347  * Bring up code
 348  */
 349
 350 static struct fb_ops vmw_fb_ops = {
 351         .owner = THIS_MODULE,
 352         .fb_check_var = vmw_fb_check_var,
 353         .fb_set_par = vmw_fb_set_par,
 354         .fb_setcolreg = vmw_fb_setcolreg,
 355         .fb_fillrect = vmw_fb_fillrect,
 356         .fb_copyarea = vmw_fb_copyarea,
 357         .fb_imageblit = vmw_fb_imageblit,
 358         .fb_pan_display = vmw_fb_pan_display,
 359         .fb_blank = vmw_fb_blank,
 360 };
 361
 362 static int vmw_fb_create_bo(struct vmw_private *vmw_priv,
 363                             size_t size, struct vmw_dma_buffer **out)
 364 {
 365         struct vmw_dma_buffer *vmw_bo;
 366         struct ttm_placement ne_placement = vmw_vram_ne_placement;
 367         int ret;
 368
 369         ne_placement.lpfn = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 370
 371         /* interuptable? */
 372         ret = ttm_write_lock(&vmw_priv->fbdev_master.lock, false);
 373         if (unlikely(ret != 0))
 374                 return ret;
 375
 376         vmw_bo = kmalloc(sizeof(*vmw_bo), GFP_KERNEL);
 377         if (!vmw_bo)
 378                 goto err_unlock;
 379
 380         ret = vmw_dmabuf_init(vmw_priv, vmw_bo, size,
 381                               &ne_placement,
 382                               false,
 383                               &vmw_dmabuf_bo_free);
 384         if (unlikely(ret != 0))
 385                 goto err_unlock; /* init frees the buffer on failure */
 386
 387         *out = vmw_bo;
 388
 389         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 390
 391         return 0;
 392
 393 err_unlock:
 394         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 395         return ret;
 396 }
 397
 398 int vmw_fb_init(struct vmw_private *vmw_priv)
 399 {
 400         struct device *device = &vmw_priv->dev->pdev->dev;
 401         struct vmw_fb_par *par;
 402         struct fb_info *info;
 403         unsigned initial_width, initial_height;
 404         unsigned fb_width, fb_height;
 405         unsigned fb_bbp, fb_depth, fb_offset, fb_pitch, fb_size;
 406         int ret;
 407
 408         /* XXX These shouldn't be hardcoded. */
 409         initial_width = 800;
 410         initial_height = 600;
 411
 412         fb_bbp = 32;
 413         fb_depth = 24;
 414
 415         /* XXX As shouldn't these be as well. */
 416         fb_width = min(vmw_priv->fb_max_width, (unsigned)2048);
 417         fb_height = min(vmw_priv->fb_max_height, (unsigned)2048);
 418
 419         initial_width = min(fb_width, initial_width);
 420         initial_height = min(fb_height, initial_height);
 421
 422         fb_pitch = fb_width * fb_bbp / 8;
 423         fb_size = fb_pitch * fb_height;
 424         fb_offset = vmw_read(vmw_priv, SVGA_REG_FB_OFFSET);
 425
 426         info = framebuffer_alloc(sizeof(*par), device);
 427         if (!info)
 428                 return -ENOMEM;
 429
 430         /*
 431          * Par
 432          */
 433         vmw_priv->fb_info = info;
 434         par = info->par;
 435         par->vmw_priv = vmw_priv;
 436         par->depth = fb_depth;
 437         par->bpp = fb_bbp;
 438         par->vmalloc = NULL;
 439         par->max_width = fb_width;
 440         par->max_height = fb_height;
 441
 442         /*
 443          * Create buffers and alloc memory
 444          */
 445         par->vmalloc = vmalloc(fb_size);
 446         if (unlikely(par->vmalloc == NULL)) {
 447                 ret = -ENOMEM;
 448                 goto err_free;
 449         }
 450
 451         ret = vmw_fb_create_bo(vmw_priv, fb_size, &par->vmw_bo);
 452         if (unlikely(ret != 0))
 453                 goto err_free;
 454
 455         ret = ttm_bo_kmap(&par->vmw_bo->base,
 456                           0,
 457                           par->vmw_bo->base.num_pages,
 458                           &par->map);
 459         if (unlikely(ret != 0))
 460                 goto err_unref;
 461         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &par->bo_iowrite);
 462         par->bo_size = fb_size;
 463
 464         /*
 465          * Fixed and var
 466          */
 467         strcpy(info->fix.id, "svgadrmfb");
 468         info->fix.type = FB_TYPE_PACKED_PIXELS;
 469         info->fix.visual = FB_VISUAL_TRUECOLOR;
 470         info->fix.type_aux = 0;
 471         info->fix.xpanstep = 1; /* doing it in hw */
 472         info->fix.ypanstep = 1; /* doing it in hw */
 473         info->fix.ywrapstep = 0;
 474         info->fix.accel = FB_ACCEL_NONE;
 475         info->fix.line_length = fb_pitch;
 476
 477         info->fix.smem_start = 0;
 478         info->fix.smem_len = fb_size;
 479
 480         info->fix.mmio_start = 0;
 481         info->fix.mmio_len = 0;
 482
 483         info->pseudo_palette = par->pseudo_palette;
 484         info->screen_base = par->vmalloc;
 485         info->screen_size = fb_size;
 486
 487         info->flags = FBINFO_DEFAULT;
 488         info->fbops = &vmw_fb_ops;
 489
 490         /* 24 depth per default */
 491         info->var.red.offset = 16;
 492         info->var.green.offset = 8;
 493         info->var.blue.offset = 0;
 494         info->var.red.length = 8;
 495         info->var.green.length = 8;
 496         info->var.blue.length = 8;
 497         info->var.transp.offset = 0;
 498         info->var.transp.length = 0;
 499
 500         info->var.xres_virtual = fb_width;
 501         info->var.yres_virtual = fb_height;
 502         info->var.bits_per_pixel = par->bpp;
 503         info->var.xoffset = 0;
 504         info->var.yoffset = 0;
 505         info->var.activate = FB_ACTIVATE_NOW;
 506         info->var.height = -1;
 507         info->var.width = -1;
 508
 509         info->var.xres = initial_width;
 510         info->var.yres = initial_height;
 511
 512 #if 0
 513         info->pixmap.size = 64*1024;
 514         info->pixmap.buf_align = 8;
 515         info->pixmap.access_align = 32;
 516         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 517         info->pixmap.scan_align = 1;
 518 #else
 519         info->pixmap.size = 0;
 520         info->pixmap.buf_align = 8;
 521         info->pixmap.access_align = 32;
 522         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 523         info->pixmap.scan_align = 1;
 524 #endif
 525
 526         info->apertures = alloc_apertures(1);
 527         if (!info->apertures) {
 528                 ret = -ENOMEM;
 529                 goto err_aper;
 530         }
 531         info->apertures->ranges[0].base = vmw_priv->vram_start;
 532         info->apertures->ranges[0].size = vmw_priv->vram_size;
 533
 534         /*
 535          * Dirty & Deferred IO
 536          */
 537         par->dirty.x1 = par->dirty.x2 = 0;
 538         par->dirty.y1 = par->dirty.y2 = 0;
 539         par->dirty.active = true;
 540         spin_lock_init(&par->dirty.lock);
 541         info->fbdefio = &vmw_defio;
 542         fb_deferred_io_init(info);
 543
 544         ret = register_framebuffer(info);
 545         if (unlikely(ret != 0))
 546                 goto err_defio;
 547
 548         return 0;
 549
 550 err_defio:
 551         fb_deferred_io_cleanup(info);
 552 err_aper:
 553         ttm_bo_kunmap(&par->map);
 554 err_unref:
 555         ttm_bo_unref((struct ttm_buffer_object **)&par->vmw_bo);
 556 err_free:
 557         vfree(par->vmalloc);
 558         framebuffer_release(info);
 559         vmw_priv->fb_info = NULL;
 560
 561         return ret;
 562 }
 563
 564 int vmw_fb_close(struct vmw_private *vmw_priv)
 565 {
 566         struct fb_info *info;
 567         struct vmw_fb_par *par;
 568         struct ttm_buffer_object *bo;
 569
 570         if (!vmw_priv->fb_info)
 571                 return 0;
 572
 573         info = vmw_priv->fb_info;
 574         par = info->par;
 575         bo = &par->vmw_bo->base;
 576         par->vmw_bo = NULL;
 577
 578         /* ??? order */
 579         fb_deferred_io_cleanup(info);
 580         unregister_framebuffer(info);
 581
 582         ttm_bo_kunmap(&par->map);
 583         ttm_bo_unref(&bo);
 584
 585         vfree(par->vmalloc);
 586         framebuffer_release(info);
 587
 588         return 0;
 589 }
 590
 591 int vmw_dmabuf_from_vram(struct vmw_private *vmw_priv,
 592                          struct vmw_dma_buffer *vmw_bo)
 593 {
 594         struct ttm_buffer_object *bo = &vmw_bo->base;
 595         int ret = 0;
 596
 597         ret = ttm_bo_reserve(bo, false, false, false, 0);
 598         if (unlikely(ret != 0))
 599                 return ret;
 600
 601         ret = ttm_bo_validate(bo, &vmw_sys_placement, false, false, false);
 602         ttm_bo_unreserve(bo);
 603
 604         return ret;
 605 }
 606
 607 int vmw_dmabuf_to_start_of_vram(struct vmw_private *vmw_priv,
 608                                 struct vmw_dma_buffer *vmw_bo)
 609 {
 610         struct ttm_buffer_object *bo = &vmw_bo->base;
 611         struct ttm_placement ne_placement = vmw_vram_ne_placement;
 612         int ret = 0;
 613
 614         ne_placement.lpfn = bo->num_pages;
 615
 616         /* interuptable? */
 617         ret = ttm_write_lock(&vmw_priv->active_master->lock, false);
 618         if (unlikely(ret != 0))
 619                 return ret;
 620
 621         ret = ttm_bo_reserve(bo, false, false, false, 0);
 622         if (unlikely(ret != 0))
 623                 goto err_unlock;
 624
 625         if (bo->mem.mem_type == TTM_PL_VRAM &&
 626             bo->mem.mm_node->start < bo->num_pages)
 627                 (void) ttm_bo_validate(bo, &vmw_sys_placement, false,
 628                                        false, false);
 629
 630         ret = ttm_bo_validate(bo, &ne_placement, false, false, false);
 631
 632         /* Could probably bug on */
 633         WARN_ON(bo->offset != 0);
 634
 635         ttm_bo_unreserve(bo);
 636 err_unlock:
 637         ttm_write_unlock(&vmw_priv->active_master->lock);
 638
 639         return ret;
 640 }
 641
 642 int vmw_fb_off(struct vmw_private *vmw_priv)
 643 {
 644         struct fb_info *info;
 645         struct vmw_fb_par *par;
 646         unsigned long flags;
 647
 648         if (!vmw_priv->fb_info)
 649                 return -EINVAL;
 650
 651         info = vmw_priv->fb_info;
 652         par = info->par;
 653
 654         spin_lock_irqsave(&par->dirty.lock, flags);
 655         par->dirty.active = false;
 656         spin_unlock_irqrestore(&par->dirty.lock, flags);
 657
 658         flush_scheduled_work();
 659
 660         par->bo_ptr = NULL;
 661         ttm_bo_kunmap(&par->map);
 662
 663         vmw_dmabuf_from_vram(vmw_priv, par->vmw_bo);
 664
 665         return 0;
 666 }
 667
 668 int vmw_fb_on(struct vmw_private *vmw_priv)
 669 {
 670         struct fb_info *info;
 671         struct vmw_fb_par *par;
 672         unsigned long flags;
 673         bool dummy;
 674         int ret;
 675
 676         if (!vmw_priv->fb_info)
 677                 return -EINVAL;
 678
 679         info = vmw_priv->fb_info;
 680         par = info->par;
 681
 682         /* we are already active */
 683         if (par->bo_ptr != NULL)
 684                 return 0;
 685
 686         /* Make sure that all overlays are stoped when we take over */
 687         vmw_overlay_stop_all(vmw_priv);
 688
 689         ret = vmw_dmabuf_to_start_of_vram(vmw_priv, par->vmw_bo);
 690         if (unlikely(ret != 0)) {
 691                 DRM_ERROR("could not move buffer to start of VRAM\n");
 692                 goto err_no_buffer;
 693         }
 694
 695         ret = ttm_bo_kmap(&par->vmw_bo->base,
 696                           0,
 697                           par->vmw_bo->base.num_pages,
 698                           &par->map);
 699         BUG_ON(ret != 0);
 700         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &dummy);
 701
 702         spin_lock_irqsave(&par->dirty.lock, flags);
 703         par->dirty.active = true;
 704         spin_unlock_irqrestore(&par->dirty.lock, flags);
 705
 706 err_no_buffer:
 707         vmw_fb_set_par(info);
 708
 709         vmw_fb_dirty_mark(par, 0, 0, info->var.xres, info->var.yres);
 710
 711         /* If there already was stuff dirty we wont
 712          * schedule a new work, so lets do it now */
 713         schedule_delayed_work(&info->deferred_work, 0);
 714
 715         return 0;
 716 }