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         if (vmw_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY) {
 156                 vmw_write(vmw_priv, SVGA_REG_ENABLE, 0);
 157                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, 0);
 158                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_IS_PRIMARY, true);
 159                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_X, 0);
 160                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_Y, 0);
 161                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_WIDTH, 0);
 162                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_HEIGHT, 0);
 163                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID);
 164
 165                 vmw_kms_write_svga(vmw_priv, info->var.xres, info->var.yres,
 166                                    info->fix.line_length,
 167                                    par->bpp, par->depth);
 168
 169                 /* TODO check if pitch and offset changes */
 170                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, 0);
 171                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_IS_PRIMARY, true);
 172                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_X, info->var.xoffset);
 173                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_Y, info->var.yoffset);
 174                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_WIDTH, info->var.xres);
 175                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_HEIGHT, info->var.yres);
 176                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID);
 177                 vmw_write(vmw_priv, SVGA_REG_NUM_GUEST_DISPLAYS, 1);
 178                 vmw_write(vmw_priv, SVGA_REG_ENABLE, 1);
 179         } else {
 180                 vmw_write(vmw_priv, SVGA_REG_ENABLE, 0);
 181                 vmw_kms_write_svga(vmw_priv, info->var.xres, info->var.yres,
 182                                    info->fix.line_length,
 183                                    par->bpp, par->depth);
 184                 vmw_write(vmw_priv, SVGA_REG_ENABLE, 1);
 185
 186         }
 187
 188         /* This is really helpful since if this fails the user
 189          * can probably not see anything on the screen.
 190          */
 191         WARN_ON(vmw_read(vmw_priv, SVGA_REG_FB_OFFSET) != 0);
 192
 193         return 0;
 194 }
 195
 196 static int vmw_fb_pan_display(struct fb_var_screeninfo *var,
 197                               struct fb_info *info)
 198 {
 199         return 0;
 200 }
 201
 202 static int vmw_fb_blank(int blank, struct fb_info *info)
 203 {
 204         return 0;
 205 }
 206
 207 /*
 208  * Dirty code
 209  */
 210
 211 static void vmw_fb_dirty_flush(struct vmw_fb_par *par)
 212 {
 213         struct vmw_private *vmw_priv = par->vmw_priv;
 214         struct fb_info *info = vmw_priv->fb_info;
 215         int stride = (info->fix.line_length / 4);
 216         int *src = (int *)info->screen_base;
 217         __le32 __iomem *vram_mem = par->bo_ptr;
 218         unsigned long flags;
 219         unsigned x, y, w, h;
 220         int i, k;
 221         struct {
 222                 uint32_t header;
 223                 SVGAFifoCmdUpdate body;
 224         } *cmd;
 225
 226         spin_lock_irqsave(&par->dirty.lock, flags);
 227         if (!par->dirty.active) {
 228                 spin_unlock_irqrestore(&par->dirty.lock, flags);
 229                 return;
 230         }
 231         x = par->dirty.x1;
 232         y = par->dirty.y1;
 233         w = min(par->dirty.x2, info->var.xres) - x;
 234         h = min(par->dirty.y2, info->var.yres) - y;
 235         par->dirty.x1 = par->dirty.x2 = 0;
 236         par->dirty.y1 = par->dirty.y2 = 0;
 237         spin_unlock_irqrestore(&par->dirty.lock, flags);
 238
 239         for (i = y * stride; i < info->fix.smem_len / 4; i += stride) {
 240                 for (k = i+x; k < i+x+w && k < info->fix.smem_len / 4; k++)
 241                         iowrite32(src[k], vram_mem + k);
 242         }
 243
 244 #if 0
 245         DRM_INFO("%s, (%u, %u) (%ux%u)\n", __func__, x, y, w, h);
 246 #endif
 247
 248         cmd = vmw_fifo_reserve(vmw_priv, sizeof(*cmd));
 249         if (unlikely(cmd == NULL)) {
 250                 DRM_ERROR("Fifo reserve failed.\n");
 251                 return;
 252         }
 253
 254         cmd->header = cpu_to_le32(SVGA_CMD_UPDATE);
 255         cmd->body.x = cpu_to_le32(x);
 256         cmd->body.y = cpu_to_le32(y);
 257         cmd->body.width = cpu_to_le32(w);
 258         cmd->body.height = cpu_to_le32(h);
 259         vmw_fifo_commit(vmw_priv, sizeof(*cmd));
 260 }
 261
 262 static void vmw_fb_dirty_mark(struct vmw_fb_par *par,
 263                               unsigned x1, unsigned y1,
 264                               unsigned width, unsigned height)
 265 {
 266         struct fb_info *info = par->vmw_priv->fb_info;
 267         unsigned long flags;
 268         unsigned x2 = x1 + width;
 269         unsigned y2 = y1 + height;
 270
 271         spin_lock_irqsave(&par->dirty.lock, flags);
 272         if (par->dirty.x1 == par->dirty.x2) {
 273                 par->dirty.x1 = x1;
 274                 par->dirty.y1 = y1;
 275                 par->dirty.x2 = x2;
 276                 par->dirty.y2 = y2;
 277                 /* if we are active start the dirty work
 278                  * we share the work with the defio system */
 279                 if (par->dirty.active)
 280                         schedule_delayed_work(&info->deferred_work, VMW_DIRTY_DELAY);
 281         } else {
 282                 if (x1 < par->dirty.x1)
 283                         par->dirty.x1 = x1;
 284                 if (y1 < par->dirty.y1)
 285                         par->dirty.y1 = y1;
 286                 if (x2 > par->dirty.x2)
 287                         par->dirty.x2 = x2;
 288                 if (y2 > par->dirty.y2)
 289                         par->dirty.y2 = y2;
 290         }
 291         spin_unlock_irqrestore(&par->dirty.lock, flags);
 292 }
 293
 294 static void vmw_deferred_io(struct fb_info *info,
 295                             struct list_head *pagelist)
 296 {
 297         struct vmw_fb_par *par = info->par;
 298         unsigned long start, end, min, max;
 299         unsigned long flags;
 300         struct page *page;
 301         int y1, y2;
 302
 303         min = ULONG_MAX;
 304         max = 0;
 305         list_for_each_entry(page, pagelist, lru) {
 306                 start = page->index << PAGE_SHIFT;
 307                 end = start + PAGE_SIZE - 1;
 308                 min = min(min, start);
 309                 max = max(max, end);
 310         }
 311
 312         if (min < max) {
 313                 y1 = min / info->fix.line_length;
 314                 y2 = (max / info->fix.line_length) + 1;
 315
 316                 spin_lock_irqsave(&par->dirty.lock, flags);
 317                 par->dirty.x1 = 0;
 318                 par->dirty.y1 = y1;
 319                 par->dirty.x2 = info->var.xres;
 320                 par->dirty.y2 = y2;
 321                 spin_unlock_irqrestore(&par->dirty.lock, flags);
 322         }
 323
 324         vmw_fb_dirty_flush(par);
 325 };
 326
 327 struct fb_deferred_io vmw_defio = {
 328         .delay          = VMW_DIRTY_DELAY,
 329         .deferred_io    = vmw_deferred_io,
 330 };
 331
 332 /*
 333  * Draw code
 334  */
 335
 336 static void vmw_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 337 {
 338         cfb_fillrect(info, rect);
 339         vmw_fb_dirty_mark(info->par, rect->dx, rect->dy,
 340                           rect->width, rect->height);
 341 }
 342
 343 static void vmw_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
 344 {
 345         cfb_copyarea(info, region);
 346         vmw_fb_dirty_mark(info->par, region->dx, region->dy,
 347                           region->width, region->height);
 348 }
 349
 350 static void vmw_fb_imageblit(struct fb_info *info, const struct fb_image *image)
 351 {
 352         cfb_imageblit(info, image);
 353         vmw_fb_dirty_mark(info->par, image->dx, image->dy,
 354                           image->width, image->height);
 355 }
 356
 357 /*
 358  * Bring up code
 359  */
 360
 361 static struct fb_ops vmw_fb_ops = {
 362         .owner = THIS_MODULE,
 363         .fb_check_var = vmw_fb_check_var,
 364         .fb_set_par = vmw_fb_set_par,
 365         .fb_setcolreg = vmw_fb_setcolreg,
 366         .fb_fillrect = vmw_fb_fillrect,
 367         .fb_copyarea = vmw_fb_copyarea,
 368         .fb_imageblit = vmw_fb_imageblit,
 369         .fb_pan_display = vmw_fb_pan_display,
 370         .fb_blank = vmw_fb_blank,
 371 };
 372
 373 static int vmw_fb_create_bo(struct vmw_private *vmw_priv,
 374                             size_t size, struct vmw_dma_buffer **out)
 375 {
 376         struct vmw_dma_buffer *vmw_bo;
 377         struct ttm_placement ne_placement = vmw_vram_ne_placement;
 378         int ret;
 379
 380         ne_placement.lpfn = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 381
 382         /* interuptable? */
 383         ret = ttm_write_lock(&vmw_priv->fbdev_master.lock, false);
 384         if (unlikely(ret != 0))
 385                 return ret;
 386
 387         vmw_bo = kmalloc(sizeof(*vmw_bo), GFP_KERNEL);
 388         if (!vmw_bo)
 389                 goto err_unlock;
 390
 391         ret = vmw_dmabuf_init(vmw_priv, vmw_bo, size,
 392                               &ne_placement,
 393                               false,
 394                               &vmw_dmabuf_bo_free);
 395         if (unlikely(ret != 0))
 396                 goto err_unlock; /* init frees the buffer on failure */
 397
 398         *out = vmw_bo;
 399
 400         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 401
 402         return 0;
 403
 404 err_unlock:
 405         ttm_write_unlock(&vmw_priv->fbdev_master.lock);
 406         return ret;
 407 }
 408
 409 int vmw_fb_init(struct vmw_private *vmw_priv)
 410 {
 411         struct device *device = &vmw_priv->dev->pdev->dev;
 412         struct vmw_fb_par *par;
 413         struct fb_info *info;
 414         unsigned initial_width, initial_height;
 415         unsigned fb_width, fb_height;
 416         unsigned fb_bbp, fb_depth, fb_offset, fb_pitch, fb_size;
 417         int ret;
 418
 419         /* XXX These shouldn't be hardcoded. */
 420         initial_width = 800;
 421         initial_height = 600;
 422
 423         fb_bbp = 32;
 424         fb_depth = 24;
 425
 426         /* XXX As shouldn't these be as well. */
 427         fb_width = min(vmw_priv->fb_max_width, (unsigned)2048);
 428         fb_height = min(vmw_priv->fb_max_height, (unsigned)2048);
 429
 430         initial_width = min(fb_width, initial_width);
 431         initial_height = min(fb_height, initial_height);
 432
 433         fb_pitch = fb_width * fb_bbp / 8;
 434         fb_size = fb_pitch * fb_height;
 435         fb_offset = vmw_read(vmw_priv, SVGA_REG_FB_OFFSET);
 436
 437         info = framebuffer_alloc(sizeof(*par), device);
 438         if (!info)
 439                 return -ENOMEM;
 440
 441         /*
 442          * Par
 443          */
 444         vmw_priv->fb_info = info;
 445         par = info->par;
 446         par->vmw_priv = vmw_priv;
 447         par->depth = fb_depth;
 448         par->bpp = fb_bbp;
 449         par->vmalloc = NULL;
 450         par->max_width = fb_width;
 451         par->max_height = fb_height;
 452
 453         /*
 454          * Create buffers and alloc memory
 455          */
 456         par->vmalloc = vmalloc(fb_size);
 457         if (unlikely(par->vmalloc == NULL)) {
 458                 ret = -ENOMEM;
 459                 goto err_free;
 460         }
 461
 462         ret = vmw_fb_create_bo(vmw_priv, fb_size, &par->vmw_bo);
 463         if (unlikely(ret != 0))
 464                 goto err_free;
 465
 466         ret = ttm_bo_kmap(&par->vmw_bo->base,
 467                           0,
 468                           par->vmw_bo->base.num_pages,
 469                           &par->map);
 470         if (unlikely(ret != 0))
 471                 goto err_unref;
 472         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &par->bo_iowrite);
 473         par->bo_size = fb_size;
 474
 475         /*
 476          * Fixed and var
 477          */
 478         strcpy(info->fix.id, "svgadrmfb");
 479         info->fix.type = FB_TYPE_PACKED_PIXELS;
 480         info->fix.visual = FB_VISUAL_TRUECOLOR;
 481         info->fix.type_aux = 0;
 482         info->fix.xpanstep = 1; /* doing it in hw */
 483         info->fix.ypanstep = 1; /* doing it in hw */
 484         info->fix.ywrapstep = 0;
 485         info->fix.accel = FB_ACCEL_NONE;
 486         info->fix.line_length = fb_pitch;
 487
 488         info->fix.smem_start = 0;
 489         info->fix.smem_len = fb_size;
 490
 491         info->fix.mmio_start = 0;
 492         info->fix.mmio_len = 0;
 493
 494         info->pseudo_palette = par->pseudo_palette;
 495         info->screen_base = par->vmalloc;
 496         info->screen_size = fb_size;
 497
 498         info->flags = FBINFO_DEFAULT;
 499         info->fbops = &vmw_fb_ops;
 500
 501         /* 24 depth per default */
 502         info->var.red.offset = 16;
 503         info->var.green.offset = 8;
 504         info->var.blue.offset = 0;
 505         info->var.red.length = 8;
 506         info->var.green.length = 8;
 507         info->var.blue.length = 8;
 508         info->var.transp.offset = 0;
 509         info->var.transp.length = 0;
 510
 511         info->var.xres_virtual = fb_width;
 512         info->var.yres_virtual = fb_height;
 513         info->var.bits_per_pixel = par->bpp;
 514         info->var.xoffset = 0;
 515         info->var.yoffset = 0;
 516         info->var.activate = FB_ACTIVATE_NOW;
 517         info->var.height = -1;
 518         info->var.width = -1;
 519
 520         info->var.xres = initial_width;
 521         info->var.yres = initial_height;
 522
 523 #if 0
 524         info->pixmap.size = 64*1024;
 525         info->pixmap.buf_align = 8;
 526         info->pixmap.access_align = 32;
 527         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 528         info->pixmap.scan_align = 1;
 529 #else
 530         info->pixmap.size = 0;
 531         info->pixmap.buf_align = 8;
 532         info->pixmap.access_align = 32;
 533         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 534         info->pixmap.scan_align = 1;
 535 #endif
 536
 537         info->apertures = alloc_apertures(1);
 538         if (!info->apertures) {
 539                 ret = -ENOMEM;
 540                 goto err_aper;
 541         }
 542         info->apertures->ranges[0].base = vmw_priv->vram_start;
 543         info->apertures->ranges[0].size = vmw_priv->vram_size;
 544
 545         /*
 546          * Dirty & Deferred IO
 547          */
 548         par->dirty.x1 = par->dirty.x2 = 0;
 549         par->dirty.y1 = par->dirty.y1 = 0;
 550         par->dirty.active = true;
 551         spin_lock_init(&par->dirty.lock);
 552         info->fbdefio = &vmw_defio;
 553         fb_deferred_io_init(info);
 554
 555         ret = register_framebuffer(info);
 556         if (unlikely(ret != 0))
 557                 goto err_defio;
 558
 559         return 0;
 560
 561 err_defio:
 562         fb_deferred_io_cleanup(info);
 563 err_aper:
 564         ttm_bo_kunmap(&par->map);
 565 err_unref:
 566         ttm_bo_unref((struct ttm_buffer_object **)&par->vmw_bo);
 567 err_free:
 568         vfree(par->vmalloc);
 569         framebuffer_release(info);
 570         vmw_priv->fb_info = NULL;
 571
 572         return ret;
 573 }
 574
 575 int vmw_fb_close(struct vmw_private *vmw_priv)
 576 {
 577         struct fb_info *info;
 578         struct vmw_fb_par *par;
 579         struct ttm_buffer_object *bo;
 580
 581         if (!vmw_priv->fb_info)
 582                 return 0;
 583
 584         info = vmw_priv->fb_info;
 585         par = info->par;
 586         bo = &par->vmw_bo->base;
 587         par->vmw_bo = NULL;
 588
 589         /* ??? order */
 590         fb_deferred_io_cleanup(info);
 591         unregister_framebuffer(info);
 592
 593         ttm_bo_kunmap(&par->map);
 594         ttm_bo_unref(&bo);
 595
 596         vfree(par->vmalloc);
 597         framebuffer_release(info);
 598
 599         return 0;
 600 }
 601
 602 int vmw_dmabuf_from_vram(struct vmw_private *vmw_priv,
 603                          struct vmw_dma_buffer *vmw_bo)
 604 {
 605         struct ttm_buffer_object *bo = &vmw_bo->base;
 606         int ret = 0;
 607
 608         ret = ttm_bo_reserve(bo, false, false, false, 0);
 609         if (unlikely(ret != 0))
 610                 return ret;
 611
 612         ret = ttm_bo_validate(bo, &vmw_sys_placement, false, false, false);
 613         ttm_bo_unreserve(bo);
 614
 615         return ret;
 616 }
 617
 618 int vmw_dmabuf_to_start_of_vram(struct vmw_private *vmw_priv,
 619                                 struct vmw_dma_buffer *vmw_bo)
 620 {
 621         struct ttm_buffer_object *bo = &vmw_bo->base;
 622         struct ttm_placement ne_placement = vmw_vram_ne_placement;
 623         int ret = 0;
 624
 625         ne_placement.lpfn = bo->num_pages;
 626
 627         /* interuptable? */
 628         ret = ttm_write_lock(&vmw_priv->active_master->lock, false);
 629         if (unlikely(ret != 0))
 630                 return ret;
 631
 632         ret = ttm_bo_reserve(bo, false, false, false, 0);
 633         if (unlikely(ret != 0))
 634                 goto err_unlock;
 635
 636         ret = ttm_bo_validate(bo, &ne_placement, false, false, false);
 637         ttm_bo_unreserve(bo);
 638 err_unlock:
 639         ttm_write_unlock(&vmw_priv->active_master->lock);
 640
 641         return ret;
 642 }
 643
 644 int vmw_fb_off(struct vmw_private *vmw_priv)
 645 {
 646         struct fb_info *info;
 647         struct vmw_fb_par *par;
 648         unsigned long flags;
 649
 650         if (!vmw_priv->fb_info)
 651                 return -EINVAL;
 652
 653         info = vmw_priv->fb_info;
 654         par = info->par;
 655
 656         spin_lock_irqsave(&par->dirty.lock, flags);
 657         par->dirty.active = false;
 658         spin_unlock_irqrestore(&par->dirty.lock, flags);
 659
 660         flush_scheduled_work();
 661
 662         par->bo_ptr = NULL;
 663         ttm_bo_kunmap(&par->map);
 664
 665         vmw_dmabuf_from_vram(vmw_priv, par->vmw_bo);
 666
 667         return 0;
 668 }
 669
 670 int vmw_fb_on(struct vmw_private *vmw_priv)
 671 {
 672         struct fb_info *info;
 673         struct vmw_fb_par *par;
 674         unsigned long flags;
 675         bool dummy;
 676         int ret;
 677
 678         if (!vmw_priv->fb_info)
 679                 return -EINVAL;
 680
 681         info = vmw_priv->fb_info;
 682         par = info->par;
 683
 684         /* we are already active */
 685         if (par->bo_ptr != NULL)
 686                 return 0;
 687
 688         /* Make sure that all overlays are stoped when we take over */
 689         vmw_overlay_stop_all(vmw_priv);
 690
 691         ret = vmw_dmabuf_to_start_of_vram(vmw_priv, par->vmw_bo);
 692         if (unlikely(ret != 0)) {
 693                 DRM_ERROR("could not move buffer to start of VRAM\n");
 694                 goto err_no_buffer;
 695         }
 696
 697         ret = ttm_bo_kmap(&par->vmw_bo->base,
 698                           0,
 699                           par->vmw_bo->base.num_pages,
 700                           &par->map);
 701         BUG_ON(ret != 0);
 702         par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &dummy);
 703
 704         spin_lock_irqsave(&par->dirty.lock, flags);
 705         par->dirty.active = true;
 706         spin_unlock_irqrestore(&par->dirty.lock, flags);
 707
 708 err_no_buffer:
 709         vmw_fb_set_par(info);
 710
 711         vmw_fb_dirty_mark(par, 0, 0, info->var.xres, info->var.yres);
 712
 713         /* If there already was stuff dirty we wont
 714          * schedule a new work, so lets do it now */
 715         schedule_delayed_work(&info->deferred_work, 0);
 716
 717         return 0;
 718 }