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         if (vmw_priv->suspended)
 216                 return;
 217
 218         spin_lock_irqsave(&par->dirty.lock, flags);
 219         if (!par->dirty.active) {
 220                 spin_unlock_irqrestore(&par->dirty.lock, flags);
 221                 return;
 222         }
 223         x = par->dirty.x1;
 224         y = par->dirty.y1;
 225         w = min(par->dirty.x2, info->var.xres) - x;
 226         h = min(par->dirty.y2, info->var.yres) - y;
 227         par->dirty.x1 = par->dirty.x2 = 0;
 228         par->dirty.y1 = par->dirty.y2 = 0;
 229         spin_unlock_irqrestore(&par->dirty.lock, flags);
 230
 231         for (i = y * stride; i < info->fix.smem_len / 4; i += stride) {
 232                 for (k = i+x; k < i+x+w && k < info->fix.smem_len / 4; k++)
 233                         iowrite32(src[k], vram_mem + k);
 234         }
 235
 236 #if 0
 237         DRM_INFO("%s, (%u, %u) (%ux%u)\n", __func__, x, y, w, h);
 238 #endif
 239
 240         cmd = vmw_fifo_reserve(vmw_priv, sizeof(*cmd));
 241         if (unlikely(cmd == NULL)) {
 242                 DRM_ERROR("Fifo reserve failed.\n");
 243                 return;
 244         }
 245
 246         cmd->header = cpu_to_le32(SVGA_CMD_UPDATE);
 247         cmd->body.x = cpu_to_le32(x);
 248         cmd->body.y = cpu_to_le32(y);
 249         cmd->body.width = cpu_to_le32(w);
 250         cmd->body.height = cpu_to_le32(h);
 251         vmw_fifo_commit(vmw_priv, sizeof(*cmd));
 252 }
 253
 254 static void vmw_fb_dirty_mark(struct vmw_fb_par *par,
 255                               unsigned x1, unsigned y1,
 256                               unsigned width, unsigned height)
 257 {
 258         struct fb_info *info = par->vmw_priv->fb_info;
 259         unsigned long flags;
 260         unsigned x2 = x1 + width;
 261         unsigned y2 = y1 + height;
 262
 263         spin_lock_irqsave(&par->dirty.lock, flags);
 264         if (par->dirty.x1 == par->dirty.x2) {
 265                 par->dirty.x1 = x1;
 266                 par->dirty.y1 = y1;
 267                 par->dirty.x2 = x2;
 268                 par->dirty.y2 = y2;
 269                 /* if we are active start the dirty work
 270                  * we share the work with the defio system */
 271                 if (par->dirty.active)
 272                         schedule_delayed_work(&info->deferred_work, VMW_DIRTY_DELAY);
 273         } else {
 274                 if (x1 < par->dirty.x1)
 275                         par->dirty.x1 = x1;
 276                 if (y1 < par->dirty.y1)
 277                         par->dirty.y1 = y1;
 278                 if (x2 > par->dirty.x2)
 279                         par->dirty.x2 = x2;
 280                 if (y2 > par->dirty.y2)
 281                         par->dirty.y2 = y2;
 282         }
 283         spin_unlock_irqrestore(&par->dirty.lock, flags);
 284 }
 285
 286 static void vmw_deferred_io(struct fb_info *info,
 287                             struct list_head *pagelist)
 288 {
 289         struct vmw_fb_par *par = info->par;
 290         unsigned long start, end, min, max;
 291         unsigned long flags;
 292         struct page *page;
 293         int y1, y2;
 294
 295         min = ULONG_MAX;
 296         max = 0;
 297         list_for_each_entry(page, pagelist, lru) {
 298                 start = page->index << PAGE_SHIFT;
 299                 end = start + PAGE_SIZE - 1;
 300                 min = min(min, start);
 301                 max = max(max, end);
 302         }
 303
 304         if (min < max) {
 305                 y1 = min / info->fix.line_length;
 306                 y2 = (max / info->fix.line_length) + 1;
 307
 308                 spin_lock_irqsave(&par->dirty.lock, flags);
 309                 par->dirty.x1 = 0;
 310                 par->dirty.y1 = y1;
 311                 par->dirty.x2 = info->var.xres;
 312                 par->dirty.y2 = y2;
 313                 spin_unlock_irqrestore(&par->dirty.lock, flags);
 314         }
 315
 316         vmw_fb_dirty_flush(par);
 317 };
 318
 319 struct fb_deferred_io vmw_defio = {
 320         .delay          = VMW_DIRTY_DELAY,
 321         .deferred_io    = vmw_deferred_io,
 322 };
 323
 324 /*
 325  * Draw code
 326  */
 327
 328 static void vmw_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 329 {
 330         cfb_fillrect(info, rect);
 331         vmw_fb_dirty_mark(info->par, rect->dx, rect->dy,
 332                           rect->width, rect->height);
 333 }
 334
 335 static void vmw_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
 336 {
 337         cfb_copyarea(info, region);
 338         vmw_fb_dirty_mark(info->par, region->dx, region->dy,
 339                           region->width, region->height);
 340 }
 341
 342 static void vmw_fb_imageblit(struct fb_info *info, const struct fb_image *image)
 343 {
 344         cfb_imageblit(info, image);
 345         vmw_fb_dirty_mark(info->par, image->dx, image->dy,
 346                           image->width, image->height);
 347 }
 348
 349 /*
 350  * Bring up code
 351  */
 352
 353 static struct fb_ops vmw_fb_ops = {
 354         .owner = THIS_MODULE,
 355         .fb_check_var = vmw_fb_check_var,
 356         .fb_set_par = vmw_fb_set_par,
 357         .fb_setcolreg = vmw_fb_setcolreg,
 358         .fb_fillrect = vmw_fb_fillrect,
 359         .fb_copyarea = vmw_fb_copyarea,
 360         .fb_imageblit = vmw_fb_imageblit,
 361         .fb_pan_display = vmw_fb_pan_display,
 362         .fb_blank = vmw_fb_blank,
 363 };
 364
 365 static int vmw_fb_create_bo(struct vmw_private *vmw_priv,
 366                             size_t size, struct vmw_dma_buffer **out)
 367 {
 368         struct vmw_dma_buffer *vmw_bo;
 369         struct ttm_placement ne_placement = vmw_vram_ne_placement;
 370         int ret;
 371
 372         ne_placement.lpfn = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 373
 374         /* interuptable? */
 375         ret = ttm_write_lock(&vmw_priv->fbdev_master.lock, false);
 376         if (unlikely(ret != 0))
 377                 return ret;
 378
 379         vmw_bo = kmalloc(sizeof(*vmw_bo), GFP_KERNEL);
 380         if (!vmw_bo)
 381                 goto err_unlock;
 382
 383         ret = vmw_dmabuf_init(vmw_priv, vmw_bo, size,
 384                               &ne_placement,
 385                               false,
 386                               &vmw_dmabuf_bo_free);
 387         if (unlikely(ret != 0))
 388                 goto err_unlock; /* init frees the buffer on failure */
 389
 390         *out = vmw_bo;
 391
 392         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 393
 394         return 0;
 395
 396 err_unlock:
 397         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 398         return ret;
 399 }
 400
 401 int vmw_fb_init(struct vmw_private *vmw_priv)
 402 {
 403         struct device *device = &vmw_priv->dev->pdev->dev;
 404         struct vmw_fb_par *par;
 405         struct fb_info *info;
 406         unsigned initial_width, initial_height;
 407         unsigned fb_width, fb_height;
 408         unsigned fb_bbp, fb_depth, fb_offset, fb_pitch, fb_size;
 409         int ret;
 410
 411         /* XXX These shouldn't be hardcoded. */
 412         initial_width = 800;
 413         initial_height = 600;
 414
 415         fb_bbp = 32;
 416         fb_depth = 24;
 417
 418         /* XXX As shouldn't these be as well. */
 419         fb_width = min(vmw_priv->fb_max_width, (unsigned)2048);
 420         fb_height = min(vmw_priv->fb_max_height, (unsigned)2048);
 421
 422         initial_width = min(fb_width, initial_width);
 423         initial_height = min(fb_height, initial_height);
 424
 425         fb_pitch = fb_width * fb_bbp / 8;
 426         fb_size = fb_pitch * fb_height;
 427         fb_offset = vmw_read(vmw_priv, SVGA_REG_FB_OFFSET);
 428
 429         info = framebuffer_alloc(sizeof(*par), device);
 430         if (!info)
 431                 return -ENOMEM;
 432
 433         /*
 434          * Par
 435          */
 436         vmw_priv->fb_info = info;
 437         par = info->par;
 438         par->vmw_priv = vmw_priv;
 439         par->depth = fb_depth;
 440         par->bpp = fb_bbp;
 441         par->vmalloc = NULL;
 442         par->max_width = fb_width;
 443         par->max_height = fb_height;
 444
 445         /*
 446          * Create buffers and alloc memory
 447          */
 448         par->vmalloc = vmalloc(fb_size);
 449         if (unlikely(par->vmalloc == NULL)) {
 450                 ret = -ENOMEM;
 451                 goto err_free;
 452         }
 453
 454         ret = vmw_fb_create_bo(vmw_priv, fb_size, &par->vmw_bo);
 455         if (unlikely(ret != 0))
 456                 goto err_free;
 457
 458         ret = ttm_bo_kmap(&par->vmw_bo->base,
 459                           0,
 460                           par->vmw_bo->base.num_pages,
 461                           &par->map);
 462         if (unlikely(ret != 0))
 463                 goto err_unref;
 464         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &par->bo_iowrite);
 465         par->bo_size = fb_size;
 466
 467         /*
 468          * Fixed and var
 469          */
 470         strcpy(info->fix.id, "svgadrmfb");
 471         info->fix.type = FB_TYPE_PACKED_PIXELS;
 472         info->fix.visual = FB_VISUAL_TRUECOLOR;
 473         info->fix.type_aux = 0;
 474         info->fix.xpanstep = 1; /* doing it in hw */
 475         info->fix.ypanstep = 1; /* doing it in hw */
 476         info->fix.ywrapstep = 0;
 477         info->fix.accel = FB_ACCEL_NONE;
 478         info->fix.line_length = fb_pitch;
 479
 480         info->fix.smem_start = 0;
 481         info->fix.smem_len = fb_size;
 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.start < bo->num_pages &&
 627             bo->mem.start > 0)
 628                 (void) ttm_bo_validate(bo, &vmw_sys_placement, false,
 629                                        false, false);
 630
 631         ret = ttm_bo_validate(bo, &ne_placement, false, false, false);
 632
 633         /* Could probably bug on */
 634         WARN_ON(bo->offset != 0);
 635
 636         ttm_bo_unreserve(bo);
 637 err_unlock:
 638         ttm_write_unlock(&vmw_priv->active_master->lock);
 639
 640         return ret;
 641 }
 642
 643 int vmw_fb_off(struct vmw_private *vmw_priv)
 644 {
 645         struct fb_info *info;
 646         struct vmw_fb_par *par;
 647         unsigned long flags;
 648
 649         if (!vmw_priv->fb_info)
 650                 return -EINVAL;
 651
 652         info = vmw_priv->fb_info;
 653         par = info->par;
 654
 655         spin_lock_irqsave(&par->dirty.lock, flags);
 656         par->dirty.active = false;
 657         spin_unlock_irqrestore(&par->dirty.lock, flags);
 658
 659         flush_delayed_work_sync(&info->deferred_work);
 660
 661         par->bo_ptr = NULL;
 662         ttm_bo_kunmap(&par->map);
 663
 664         vmw_dmabuf_from_vram(vmw_priv, par->vmw_bo);
 665
 666         return 0;
 667 }
 668
 669 int vmw_fb_on(struct vmw_private *vmw_priv)
 670 {
 671         struct fb_info *info;
 672         struct vmw_fb_par *par;
 673         unsigned long flags;
 674         bool dummy;
 675         int ret;
 676
 677         if (!vmw_priv->fb_info)
 678                 return -EINVAL;
 679
 680         info = vmw_priv->fb_info;
 681         par = info->par;
 682
 683         /* we are already active */
 684         if (par->bo_ptr != NULL)
 685                 return 0;
 686
 687         /* Make sure that all overlays are stoped when we take over */
 688         vmw_overlay_stop_all(vmw_priv);
 689
 690         ret = vmw_dmabuf_to_start_of_vram(vmw_priv, par->vmw_bo);
 691         if (unlikely(ret != 0)) {
 692                 DRM_ERROR("could not move buffer to start of VRAM\n");
 693                 goto err_no_buffer;
 694         }
 695
 696         ret = ttm_bo_kmap(&par->vmw_bo->base,
 697                           0,
 698                           par->vmw_bo->base.num_pages,
 699                           &par->map);
 700         BUG_ON(ret != 0);
 701         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &dummy);
 702
 703         spin_lock_irqsave(&par->dirty.lock, flags);
 704         par->dirty.active = true;
 705         spin_unlock_irqrestore(&par->dirty.lock, flags);
 706
 707 err_no_buffer:
 708         vmw_fb_set_par(info);
 709
 710         vmw_fb_dirty_mark(par, 0, 0, info->var.xres, info->var.yres);
 711
 712         /* If there already was stuff dirty we wont
 713          * schedule a new work, so lets do it now */
 714         schedule_delayed_work(&info->deferred_work, 0);
 715
 716         return 0;
 717 }