drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "vmwgfx_drv.h"
  29 #include <drm/ttm/ttm_bo_driver.h>
  30 #include <drm/ttm/ttm_placement.h>
  31 #include <drm/ttm/ttm_page_alloc.h>
  32
  33 static uint32_t vram_placement_flags = TTM_PL_FLAG_VRAM |
  34         TTM_PL_FLAG_CACHED;
  35
  36 static uint32_t vram_ne_placement_flags = TTM_PL_FLAG_VRAM |
  37         TTM_PL_FLAG_CACHED |
  38         TTM_PL_FLAG_NO_EVICT;
  39
  40 static uint32_t sys_placement_flags = TTM_PL_FLAG_SYSTEM |
  41         TTM_PL_FLAG_CACHED;
  42
  43 static uint32_t sys_ne_placement_flags = TTM_PL_FLAG_SYSTEM |
  44         TTM_PL_FLAG_CACHED |
  45         TTM_PL_FLAG_NO_EVICT;
  46
  47 static uint32_t gmr_placement_flags = VMW_PL_FLAG_GMR |
  48         TTM_PL_FLAG_CACHED;
  49
  50 static uint32_t gmr_ne_placement_flags = VMW_PL_FLAG_GMR |
  51         TTM_PL_FLAG_CACHED |
  52         TTM_PL_FLAG_NO_EVICT;
  53
  54 static uint32_t mob_placement_flags = VMW_PL_FLAG_MOB |
  55         TTM_PL_FLAG_CACHED;
  56
  57 struct ttm_placement vmw_vram_placement = {
  58         .fpfn = 0,
  59         .lpfn = 0,
  60         .num_placement = 1,
  61         .placement = &vram_placement_flags,
  62         .num_busy_placement = 1,
  63         .busy_placement = &vram_placement_flags
  64 };
  65
  66 static uint32_t vram_gmr_placement_flags[] = {
  67         TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED,
  68         VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
  69 };
  70
  71 static uint32_t gmr_vram_placement_flags[] = {
  72         VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED,
  73         TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
  74 };
  75
  76 struct ttm_placement vmw_vram_gmr_placement = {
  77         .fpfn = 0,
  78         .lpfn = 0,
  79         .num_placement = 2,
  80         .placement = vram_gmr_placement_flags,
  81         .num_busy_placement = 1,
  82         .busy_placement = &gmr_placement_flags
  83 };
  84
  85 static uint32_t vram_gmr_ne_placement_flags[] = {
  86         TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT,
  87         VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT
  88 };
  89
  90 struct ttm_placement vmw_vram_gmr_ne_placement = {
  91         .fpfn = 0,
  92         .lpfn = 0,
  93         .num_placement = 2,
  94         .placement = vram_gmr_ne_placement_flags,
  95         .num_busy_placement = 1,
  96         .busy_placement = &gmr_ne_placement_flags
  97 };
  98
  99 struct ttm_placement vmw_vram_sys_placement = {
 100         .fpfn = 0,
 101         .lpfn = 0,
 102         .num_placement = 1,
 103         .placement = &vram_placement_flags,
 104         .num_busy_placement = 1,
 105         .busy_placement = &sys_placement_flags
 106 };
 107
 108 struct ttm_placement vmw_vram_ne_placement = {
 109         .fpfn = 0,
 110         .lpfn = 0,
 111         .num_placement = 1,
 112         .placement = &vram_ne_placement_flags,
 113         .num_busy_placement = 1,
 114         .busy_placement = &vram_ne_placement_flags
 115 };
 116
 117 struct ttm_placement vmw_sys_placement = {
 118         .fpfn = 0,
 119         .lpfn = 0,
 120         .num_placement = 1,
 121         .placement = &sys_placement_flags,
 122         .num_busy_placement = 1,
 123         .busy_placement = &sys_placement_flags
 124 };
 125
 126 struct ttm_placement vmw_sys_ne_placement = {
 127         .fpfn = 0,
 128         .lpfn = 0,
 129         .num_placement = 1,
 130         .placement = &sys_ne_placement_flags,
 131         .num_busy_placement = 1,
 132         .busy_placement = &sys_ne_placement_flags
 133 };
 134
 135 static uint32_t evictable_placement_flags[] = {
 136         TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED,
 137         TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED,
 138         VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED,
 139         VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED
 140 };
 141
 142 struct ttm_placement vmw_evictable_placement = {
 143         .fpfn = 0,
 144         .lpfn = 0,
 145         .num_placement = 4,
 146         .placement = evictable_placement_flags,
 147         .num_busy_placement = 1,
 148         .busy_placement = &sys_placement_flags
 149 };
 150
 151 struct ttm_placement vmw_srf_placement = {
 152         .fpfn = 0,
 153         .lpfn = 0,
 154         .num_placement = 1,
 155         .num_busy_placement = 2,
 156         .placement = &gmr_placement_flags,
 157         .busy_placement = gmr_vram_placement_flags
 158 };
 159
 160 struct ttm_placement vmw_mob_placement = {
 161         .fpfn = 0,
 162         .lpfn = 0,
 163         .num_placement = 1,
 164         .num_busy_placement = 1,
 165         .placement = &mob_placement_flags,
 166         .busy_placement = &mob_placement_flags
 167 };
 168
 169 struct vmw_ttm_tt {
 170         struct ttm_dma_tt dma_ttm;
 171         struct vmw_private *dev_priv;
 172         int gmr_id;
 173         struct vmw_mob *mob;
 174         int mem_type;
 175         struct sg_table sgt;
 176         struct vmw_sg_table vsgt;
 177         uint64_t sg_alloc_size;
 178         bool mapped;
 179 };
 180
 181 const size_t vmw_tt_size = sizeof(struct vmw_ttm_tt);
 182
 183 /**
 184  * Helper functions to advance a struct vmw_piter iterator.
 185  *
 186  * @viter: Pointer to the iterator.
 187  *
 188  * These functions return false if past the end of the list,
 189  * true otherwise. Functions are selected depending on the current
 190  * DMA mapping mode.
 191  */
 192 static bool __vmw_piter_non_sg_next(struct vmw_piter *viter)
 193 {
 194         return ++(viter->i) < viter->num_pages;
 195 }
 196
 197 static bool __vmw_piter_sg_next(struct vmw_piter *viter)
 198 {
 199         return __sg_page_iter_next(&viter->iter);
 200 }
 201
 202
 203 /**
 204  * Helper functions to return a pointer to the current page.
 205  *
 206  * @viter: Pointer to the iterator
 207  *
 208  * These functions return a pointer to the page currently
 209  * pointed to by @viter. Functions are selected depending on the
 210  * current mapping mode.
 211  */
 212 static struct page *__vmw_piter_non_sg_page(struct vmw_piter *viter)
 213 {
 214         return viter->pages[viter->i];
 215 }
 216
 217 static struct page *__vmw_piter_sg_page(struct vmw_piter *viter)
 218 {
 219         return sg_page_iter_page(&viter->iter);
 220 }
 221
 222
 223 /**
 224  * Helper functions to return the DMA address of the current page.
 225  *
 226  * @viter: Pointer to the iterator
 227  *
 228  * These functions return the DMA address of the page currently
 229  * pointed to by @viter. Functions are selected depending on the
 230  * current mapping mode.
 231  */
 232 static dma_addr_t __vmw_piter_phys_addr(struct vmw_piter *viter)
 233 {
 234         return page_to_phys(viter->pages[viter->i]);
 235 }
 236
 237 static dma_addr_t __vmw_piter_dma_addr(struct vmw_piter *viter)
 238 {
 239         return viter->addrs[viter->i];
 240 }
 241
 242 static dma_addr_t __vmw_piter_sg_addr(struct vmw_piter *viter)
 243 {
 244         return sg_page_iter_dma_address(&viter->iter);
 245 }
 246
 247
 248 /**
 249  * vmw_piter_start - Initialize a struct vmw_piter.
 250  *
 251  * @viter: Pointer to the iterator to initialize
 252  * @vsgt: Pointer to a struct vmw_sg_table to initialize from
 253  *
 254  * Note that we're following the convention of __sg_page_iter_start, so that
 255  * the iterator doesn't point to a valid page after initialization; it has
 256  * to be advanced one step first.
 257  */
 258 void vmw_piter_start(struct vmw_piter *viter, const struct vmw_sg_table *vsgt,
 259                      unsigned long p_offset)
 260 {
 261         viter->i = p_offset - 1;
 262         viter->num_pages = vsgt->num_pages;
 263         switch (vsgt->mode) {
 264         case vmw_dma_phys:
 265                 viter->next = &__vmw_piter_non_sg_next;
 266                 viter->dma_address = &__vmw_piter_phys_addr;
 267                 viter->page = &__vmw_piter_non_sg_page;
 268                 viter->pages = vsgt->pages;
 269                 break;
 270         case vmw_dma_alloc_coherent:
 271                 viter->next = &__vmw_piter_non_sg_next;
 272                 viter->dma_address = &__vmw_piter_dma_addr;
 273                 viter->page = &__vmw_piter_non_sg_page;
 274                 viter->addrs = vsgt->addrs;
 275                 viter->pages = vsgt->pages;
 276                 break;
 277         case vmw_dma_map_populate:
 278         case vmw_dma_map_bind:
 279                 viter->next = &__vmw_piter_sg_next;
 280                 viter->dma_address = &__vmw_piter_sg_addr;
 281                 viter->page = &__vmw_piter_sg_page;
 282                 __sg_page_iter_start(&viter->iter, vsgt->sgt->sgl,
 283                                      vsgt->sgt->orig_nents, p_offset);
 284                 break;
 285         default:
 286                 BUG();
 287         }
 288 }
 289
 290 /**
 291  * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for
 292  * TTM pages
 293  *
 294  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 295  *
 296  * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.
 297  */
 298 static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)
 299 {
 300         struct device *dev = vmw_tt->dev_priv->dev->dev;
 301
 302         dma_unmap_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.nents,
 303                 DMA_BIDIRECTIONAL);
 304         vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;
 305 }
 306
 307 /**
 308  * vmw_ttm_map_for_dma - map TTM pages to get device addresses
 309  *
 310  * @vmw_tt: Pointer to a struct vmw_ttm_backend
 311  *
 312  * This function is used to get device addresses from the kernel DMA layer.
 313  * However, it's violating the DMA API in that when this operation has been
 314  * performed, it's illegal for the CPU to write to the pages without first
 315  * unmapping the DMA mappings, or calling dma_sync_sg_for_cpu(). It is
 316  * therefore only legal to call this function if we know that the function
 317  * dma_sync_sg_for_cpu() is a NOP, and dma_sync_sg_for_device() is at most
 318  * a CPU write buffer flush.
 319  */
 320 static int vmw_ttm_map_for_dma(struct vmw_ttm_tt *vmw_tt)
 321 {
 322         struct device *dev = vmw_tt->dev_priv->dev->dev;
 323         int ret;
 324
 325         ret = dma_map_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.orig_nents,
 326                          DMA_BIDIRECTIONAL);
 327         if (unlikely(ret == 0))
 328                 return -ENOMEM;
 329
 330         vmw_tt->sgt.nents = ret;
 331
 332         return 0;
 333 }
 334
 335 /**
 336  * vmw_ttm_map_dma - Make sure TTM pages are visible to the device
 337  *
 338  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 339  *
 340  * Select the correct function for and make sure the TTM pages are
 341  * visible to the device. Allocate storage for the device mappings.
 342  * If a mapping has already been performed, indicated by the storage
 343  * pointer being non NULL, the function returns success.
 344  */
 345 static int vmw_ttm_map_dma(struct vmw_ttm_tt *vmw_tt)
 346 {
 347         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 348         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 349         struct vmw_sg_table *vsgt = &vmw_tt->vsgt;
 350         struct vmw_piter iter;
 351         dma_addr_t old;
 352         int ret = 0;
 353         static size_t sgl_size;
 354         static size_t sgt_size;
 355
 356         if (vmw_tt->mapped)
 357                 return 0;
 358
 359         vsgt->mode = dev_priv->map_mode;
 360         vsgt->pages = vmw_tt->dma_ttm.ttm.pages;
 361         vsgt->num_pages = vmw_tt->dma_ttm.ttm.num_pages;
 362         vsgt->addrs = vmw_tt->dma_ttm.dma_address;
 363         vsgt->sgt = &vmw_tt->sgt;
 364
 365         switch (dev_priv->map_mode) {
 366         case vmw_dma_map_bind:
 367         case vmw_dma_map_populate:
 368                 if (unlikely(!sgl_size)) {
 369                         sgl_size = ttm_round_pot(sizeof(struct scatterlist));
 370                         sgt_size = ttm_round_pot(sizeof(struct sg_table));
 371                 }
 372                 vmw_tt->sg_alloc_size = sgt_size + sgl_size * vsgt->num_pages;
 373                 ret = ttm_mem_global_alloc(glob, vmw_tt->sg_alloc_size, false,
 374                                            true);
 375                 if (unlikely(ret != 0))
 376                         return ret;
 377
 378                 ret = sg_alloc_table_from_pages(&vmw_tt->sgt, vsgt->pages,
 379                                                 vsgt->num_pages, 0,
 380                                                 (unsigned long)
 381                                                 vsgt->num_pages << PAGE_SHIFT,
 382                                                 GFP_KERNEL);
 383                 if (unlikely(ret != 0))
 384                         goto out_sg_alloc_fail;
 385
 386                 if (vsgt->num_pages > vmw_tt->sgt.nents) {
 387                         uint64_t over_alloc =
 388                                 sgl_size * (vsgt->num_pages -
 389                                             vmw_tt->sgt.nents);
 390
 391                         ttm_mem_global_free(glob, over_alloc);
 392                         vmw_tt->sg_alloc_size -= over_alloc;
 393                 }
 394
 395                 ret = vmw_ttm_map_for_dma(vmw_tt);
 396                 if (unlikely(ret != 0))
 397                         goto out_map_fail;
 398
 399                 break;
 400         default:
 401                 break;
 402         }
 403
 404         old = ~((dma_addr_t) 0);
 405         vmw_tt->vsgt.num_regions = 0;
 406         for (vmw_piter_start(&iter, vsgt, 0); vmw_piter_next(&iter);) {
 407                 dma_addr_t cur = vmw_piter_dma_addr(&iter);
 408
 409                 if (cur != old + PAGE_SIZE)
 410                         vmw_tt->vsgt.num_regions++;
 411                 old = cur;
 412         }
 413
 414         vmw_tt->mapped = true;
 415         return 0;
 416
 417 out_map_fail:
 418         sg_free_table(vmw_tt->vsgt.sgt);
 419         vmw_tt->vsgt.sgt = NULL;
 420 out_sg_alloc_fail:
 421         ttm_mem_global_free(glob, vmw_tt->sg_alloc_size);
 422         return ret;
 423 }
 424
 425 /**
 426  * vmw_ttm_unmap_dma - Tear down any TTM page device mappings
 427  *
 428  * @vmw_tt: Pointer to a struct vmw_ttm_tt
 429  *
 430  * Tear down any previously set up device DMA mappings and free
 431  * any storage space allocated for them. If there are no mappings set up,
 432  * this function is a NOP.
 433  */
 434 static void vmw_ttm_unmap_dma(struct vmw_ttm_tt *vmw_tt)
 435 {
 436         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 437
 438         if (!vmw_tt->vsgt.sgt)
 439                 return;
 440
 441         switch (dev_priv->map_mode) {
 442         case vmw_dma_map_bind:
 443         case vmw_dma_map_populate:
 444                 vmw_ttm_unmap_from_dma(vmw_tt);
 445                 sg_free_table(vmw_tt->vsgt.sgt);
 446                 vmw_tt->vsgt.sgt = NULL;
 447                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 448                                     vmw_tt->sg_alloc_size);
 449                 break;
 450         default:
 451                 break;
 452         }
 453         vmw_tt->mapped = false;
 454 }
 455
 456
 457 /**
 458  * vmw_bo_map_dma - Make sure buffer object pages are visible to the device
 459  *
 460  * @bo: Pointer to a struct ttm_buffer_object
 461  *
 462  * Wrapper around vmw_ttm_map_dma, that takes a TTM buffer object pointer
 463  * instead of a pointer to a struct vmw_ttm_backend as argument.
 464  * Note that the buffer object must be either pinned or reserved before
 465  * calling this function.
 466  */
 467 int vmw_bo_map_dma(struct ttm_buffer_object *bo)
 468 {
 469         struct vmw_ttm_tt *vmw_tt =
 470                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 471
 472         return vmw_ttm_map_dma(vmw_tt);
 473 }
 474
 475
 476 /**
 477  * vmw_bo_unmap_dma - Make sure buffer object pages are visible to the device
 478  *
 479  * @bo: Pointer to a struct ttm_buffer_object
 480  *
 481  * Wrapper around vmw_ttm_unmap_dma, that takes a TTM buffer object pointer
 482  * instead of a pointer to a struct vmw_ttm_backend as argument.
 483  */
 484 void vmw_bo_unmap_dma(struct ttm_buffer_object *bo)
 485 {
 486         struct vmw_ttm_tt *vmw_tt =
 487                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 488
 489         vmw_ttm_unmap_dma(vmw_tt);
 490 }
 491
 492
 493 /**
 494  * vmw_bo_sg_table - Return a struct vmw_sg_table object for a
 495  * TTM buffer object
 496  *
 497  * @bo: Pointer to a struct ttm_buffer_object
 498  *
 499  * Returns a pointer to a struct vmw_sg_table object. The object should
 500  * not be freed after use.
 501  * Note that for the device addresses to be valid, the buffer object must
 502  * either be reserved or pinned.
 503  */
 504 const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
 505 {
 506         struct vmw_ttm_tt *vmw_tt =
 507                 container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 508
 509         return &vmw_tt->vsgt;
 510 }
 511
 512
 513 static int vmw_ttm_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
 514 {
 515         struct vmw_ttm_tt *vmw_be =
 516                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 517         int ret;
 518
 519         ret = vmw_ttm_map_dma(vmw_be);
 520         if (unlikely(ret != 0))
 521                 return ret;
 522
 523         vmw_be->gmr_id = bo_mem->start;
 524         vmw_be->mem_type = bo_mem->mem_type;
 525
 526         switch (bo_mem->mem_type) {
 527         case VMW_PL_GMR:
 528                 return vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
 529                                     ttm->num_pages, vmw_be->gmr_id);
 530         case VMW_PL_MOB:
 531                 if (unlikely(vmw_be->mob == NULL)) {
 532                         vmw_be->mob =
 533                                 vmw_mob_create(ttm->num_pages);
 534                         if (unlikely(vmw_be->mob == NULL))
 535                                 return -ENOMEM;
 536                 }
 537
 538                 return vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
 539                                     &vmw_be->vsgt, ttm->num_pages,
 540                                     vmw_be->gmr_id);
 541         default:
 542                 BUG();
 543         }
 544         return 0;
 545 }
 546
 547 static int vmw_ttm_unbind(struct ttm_tt *ttm)
 548 {
 549         struct vmw_ttm_tt *vmw_be =
 550                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 551
 552         switch (vmw_be->mem_type) {
 553         case VMW_PL_GMR:
 554                 vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
 555                 break;
 556         case VMW_PL_MOB:
 557                 vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
 558                 break;
 559         default:
 560                 BUG();
 561         }
 562
 563         if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
 564                 vmw_ttm_unmap_dma(vmw_be);
 565
 566         return 0;
 567 }
 568
 569
 570 static void vmw_ttm_destroy(struct ttm_tt *ttm)
 571 {
 572         struct vmw_ttm_tt *vmw_be =
 573                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 574
 575         vmw_ttm_unmap_dma(vmw_be);
 576         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 577                 ttm_dma_tt_fini(&vmw_be->dma_ttm);
 578         else
 579                 ttm_tt_fini(ttm);
 580
 581         if (vmw_be->mob)
 582                 vmw_mob_destroy(vmw_be->mob);
 583
 584         kfree(vmw_be);
 585 }
 586
 587
 588 static int vmw_ttm_populate(struct ttm_tt *ttm)
 589 {
 590         struct vmw_ttm_tt *vmw_tt =
 591                 container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
 592         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 593         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 594         int ret;
 595
 596         if (ttm->state != tt_unpopulated)
 597                 return 0;
 598
 599         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 600                 size_t size =
 601                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 602                 ret = ttm_mem_global_alloc(glob, size, false, true);
 603                 if (unlikely(ret != 0))
 604                         return ret;
 605
 606                 ret = ttm_dma_populate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
 607                 if (unlikely(ret != 0))
 608                         ttm_mem_global_free(glob, size);
 609         } else
 610                 ret = ttm_pool_populate(ttm);
 611
 612         return ret;
 613 }
 614
 615 static void vmw_ttm_unpopulate(struct ttm_tt *ttm)
 616 {
 617         struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
 618                                                  dma_ttm.ttm);
 619         struct vmw_private *dev_priv = vmw_tt->dev_priv;
 620         struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
 621
 622
 623         if (vmw_tt->mob) {
 624                 vmw_mob_destroy(vmw_tt->mob);
 625                 vmw_tt->mob = NULL;
 626         }
 627
 628         vmw_ttm_unmap_dma(vmw_tt);
 629         if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
 630                 size_t size =
 631                         ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
 632
 633                 ttm_dma_unpopulate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
 634                 ttm_mem_global_free(glob, size);
 635         } else
 636                 ttm_pool_unpopulate(ttm);
 637 }
 638
 639 static struct ttm_backend_func vmw_ttm_func = {
 640         .bind = vmw_ttm_bind,
 641         .unbind = vmw_ttm_unbind,
 642         .destroy = vmw_ttm_destroy,
 643 };
 644
 645 static struct ttm_tt *vmw_ttm_tt_create(struct ttm_bo_device *bdev,
 646                                  unsigned long size, uint32_t page_flags,
 647                                  struct page *dummy_read_page)
 648 {
 649         struct vmw_ttm_tt *vmw_be;
 650         int ret;
 651
 652         vmw_be = kzalloc(sizeof(*vmw_be), GFP_KERNEL);
 653         if (!vmw_be)
 654                 return NULL;
 655
 656         vmw_be->dma_ttm.ttm.func = &vmw_ttm_func;
 657         vmw_be->dev_priv = container_of(bdev, struct vmw_private, bdev);
 658         vmw_be->mob = NULL;
 659
 660         if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
 661                 ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bdev, size, page_flags,
 662                                       dummy_read_page);
 663         else
 664                 ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bdev, size, page_flags,
 665                                   dummy_read_page);
 666         if (unlikely(ret != 0))
 667                 goto out_no_init;
 668
 669         return &vmw_be->dma_ttm.ttm;
 670 out_no_init:
 671         kfree(vmw_be);
 672         return NULL;
 673 }
 674
 675 static int vmw_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
 676 {
 677         return 0;
 678 }
 679
 680 static int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 681                       struct ttm_mem_type_manager *man)
 682 {
 683         switch (type) {
 684         case TTM_PL_SYSTEM:
 685                 /* System memory */
 686
 687                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 688                 man->available_caching = TTM_PL_FLAG_CACHED;
 689                 man->default_caching = TTM_PL_FLAG_CACHED;
 690                 break;
 691         case TTM_PL_VRAM:
 692                 /* "On-card" video ram */
 693                 man->func = &ttm_bo_manager_func;
 694                 man->gpu_offset = 0;
 695                 man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
 696                 man->available_caching = TTM_PL_FLAG_CACHED;
 697                 man->default_caching = TTM_PL_FLAG_CACHED;
 698                 break;
 699         case VMW_PL_GMR:
 700         case VMW_PL_MOB:
 701                 /*
 702                  * "Guest Memory Regions" is an aperture like feature with
 703                  *  one slot per bo. There is an upper limit of the number of
 704                  *  slots as well as the bo size.
 705                  */
 706                 man->func = &vmw_gmrid_manager_func;
 707                 man->gpu_offset = 0;
 708                 man->flags = TTM_MEMTYPE_FLAG_CMA | TTM_MEMTYPE_FLAG_MAPPABLE;
 709                 man->available_caching = TTM_PL_FLAG_CACHED;
 710                 man->default_caching = TTM_PL_FLAG_CACHED;
 711                 break;
 712         default:
 713                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 714                 return -EINVAL;
 715         }
 716         return 0;
 717 }
 718
 719 static void vmw_evict_flags(struct ttm_buffer_object *bo,
 720                      struct ttm_placement *placement)
 721 {
 722         *placement = vmw_sys_placement;
 723 }
 724
 725 static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 726 {
 727         struct ttm_object_file *tfile =
 728                 vmw_fpriv((struct drm_file *)filp->private_data)->tfile;
 729
 730         return vmw_user_dmabuf_verify_access(bo, tfile);
 731 }
 732
 733 static int vmw_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 734 {
 735         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 736         struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
 737
 738         mem->bus.addr = NULL;
 739         mem->bus.is_iomem = false;
 740         mem->bus.offset = 0;
 741         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 742         mem->bus.base = 0;
 743         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 744                 return -EINVAL;
 745         switch (mem->mem_type) {
 746         case TTM_PL_SYSTEM:
 747         case VMW_PL_GMR:
 748         case VMW_PL_MOB:
 749                 return 0;
 750         case TTM_PL_VRAM:
 751                 mem->bus.offset = mem->start << PAGE_SHIFT;
 752                 mem->bus.base = dev_priv->vram_start;
 753                 mem->bus.is_iomem = true;
 754                 break;
 755         default:
 756                 return -EINVAL;
 757         }
 758         return 0;
 759 }
 760
 761 static void vmw_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 762 {
 763 }
 764
 765 static int vmw_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
 766 {
 767         return 0;
 768 }
 769
 770 /**
 771  * FIXME: We're using the old vmware polling method to sync.
 772  * Do this with fences instead.
 773  */
 774
 775 static void *vmw_sync_obj_ref(void *sync_obj)
 776 {
 777
 778         return (void *)
 779                 vmw_fence_obj_reference((struct vmw_fence_obj *) sync_obj);
 780 }
 781
 782 static void vmw_sync_obj_unref(void **sync_obj)
 783 {
 784         vmw_fence_obj_unreference((struct vmw_fence_obj **) sync_obj);
 785 }
 786
 787 static int vmw_sync_obj_flush(void *sync_obj)
 788 {
 789         vmw_fence_obj_flush((struct vmw_fence_obj *) sync_obj);
 790         return 0;
 791 }
 792
 793 static bool vmw_sync_obj_signaled(void *sync_obj)
 794 {
 795         return  vmw_fence_obj_signaled((struct vmw_fence_obj *) sync_obj,
 796                                        DRM_VMW_FENCE_FLAG_EXEC);
 797
 798 }
 799
 800 static int vmw_sync_obj_wait(void *sync_obj, bool lazy, bool interruptible)
 801 {
 802         return vmw_fence_obj_wait((struct vmw_fence_obj *) sync_obj,
 803                                   DRM_VMW_FENCE_FLAG_EXEC,
 804                                   lazy, interruptible,
 805                                   VMW_FENCE_WAIT_TIMEOUT);
 806 }
 807
 808 /**
 809  * vmw_move_notify - TTM move_notify_callback
 810  *
 811  * @bo:             The TTM buffer object about to move.
 812  * @mem:            The truct ttm_mem_reg indicating to what memory
 813  *                  region the move is taking place.
 814  *
 815  * Calls move_notify for all subsystems needing it.
 816  * (currently only resources).
 817  */
 818 static void vmw_move_notify(struct ttm_buffer_object *bo,
 819                             struct ttm_mem_reg *mem)
 820 {
 821         vmw_resource_move_notify(bo, mem);
 822 }
 823
 824
 825 /**
 826  * vmw_swap_notify - TTM move_notify_callback
 827  *
 828  * @bo:             The TTM buffer object about to be swapped out.
 829  */
 830 static void vmw_swap_notify(struct ttm_buffer_object *bo)
 831 {
 832         struct ttm_bo_device *bdev = bo->bdev;
 833
 834         spin_lock(&bdev->fence_lock);
 835         ttm_bo_wait(bo, false, false, false);
 836         spin_unlock(&bdev->fence_lock);
 837 }
 838
 839
 840 struct ttm_bo_driver vmw_bo_driver = {
 841         .ttm_tt_create = &vmw_ttm_tt_create,
 842         .ttm_tt_populate = &vmw_ttm_populate,
 843         .ttm_tt_unpopulate = &vmw_ttm_unpopulate,
 844         .invalidate_caches = vmw_invalidate_caches,
 845         .init_mem_type = vmw_init_mem_type,
 846         .evict_flags = vmw_evict_flags,
 847         .move = NULL,
 848         .verify_access = vmw_verify_access,
 849         .sync_obj_signaled = vmw_sync_obj_signaled,
 850         .sync_obj_wait = vmw_sync_obj_wait,
 851         .sync_obj_flush = vmw_sync_obj_flush,
 852         .sync_obj_unref = vmw_sync_obj_unref,
 853         .sync_obj_ref = vmw_sync_obj_ref,
 854         .move_notify = vmw_move_notify,
 855         .swap_notify = vmw_swap_notify,
 856         .fault_reserve_notify = &vmw_ttm_fault_reserve_notify,
 857         .io_mem_reserve = &vmw_ttm_io_mem_reserve,
 858         .io_mem_free = &vmw_ttm_io_mem_free,
 859 };