sys/dev/drm/i915/i915_gem_stolen.c

   1 /*
   2  * Copyright © 2008-2012 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *    Chris Wilson <chris@chris-wilson.co.uk>
  26  *
  27  */
  28
  29 #include <drm/drmP.h>
  30 #include <drm/i915_drm.h>
  31 #include "i915_drv.h"
  32
  33 #define KB(x) ((x) * 1024)
  34 #define MB(x) (KB(x) * 1024)
  35
  36 /*
  37  * The BIOS typically reserves some of the system's memory for the exclusive
  38  * use of the integrated graphics. This memory is no longer available for
  39  * use by the OS and so the user finds that his system has less memory
  40  * available than he put in. We refer to this memory as stolen.
  41  *
  42  * The BIOS will allocate its framebuffer from the stolen memory. Our
  43  * goal is try to reuse that object for our own fbcon which must always
  44  * be available for panics. Anything else we can reuse the stolen memory
  45  * for is a boon.
  46  */
  47
  48 int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
  49                                          struct drm_mm_node *node, u64 size,
  50                                          unsigned alignment, u64 start, u64 end)
  51 {
  52         int ret;
  53
  54         if (!drm_mm_initialized(&dev_priv->mm.stolen))
  55                 return -ENODEV;
  56
  57         /* See the comment at the drm_mm_init() call for more about this check.
  58          * WaSkipStolenMemoryFirstPage:bdw,chv,kbl (incomplete)
  59          */
  60         if (start < 4096 && (IS_GEN8(dev_priv) ||
  61                              IS_KBL_REVID(dev_priv, 0, KBL_REVID_A0)))
  62                 start = 4096;
  63
  64         mutex_lock(&dev_priv->mm.stolen_lock);
  65         ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
  66                                           alignment, start, end,
  67                                           DRM_MM_SEARCH_DEFAULT);
  68         mutex_unlock(&dev_priv->mm.stolen_lock);
  69
  70         return ret;
  71 }
  72
  73 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
  74                                 struct drm_mm_node *node, u64 size,
  75                                 unsigned alignment)
  76 {
  77         struct i915_ggtt *ggtt = &dev_priv->ggtt;
  78
  79         return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
  80                                                     alignment, 0,
  81                                                     ggtt->stolen_usable_size);
  82 }
  83
  84 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
  85                                  struct drm_mm_node *node)
  86 {
  87         mutex_lock(&dev_priv->mm.stolen_lock);
  88         drm_mm_remove_node(node);
  89         mutex_unlock(&dev_priv->mm.stolen_lock);
  90 }
  91
  92 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
  93 {
  94         struct drm_i915_private *dev_priv = to_i915(dev);
  95         struct i915_ggtt *ggtt = &dev_priv->ggtt;
  96         u32 base;
  97
  98         /* Almost universally we can find the Graphics Base of Stolen Memory
  99          * at register BSM (0x5c) in the igfx configuration space. On a few
 100          * (desktop) machines this is also mirrored in the bridge device at
 101          * different locations, or in the MCHBAR.
 102          *
 103          * On 865 we just check the TOUD register.
 104          *
 105          * On 830/845/85x the stolen memory base isn't available in any
 106          * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
 107          *
 108          */
 109         base = 0;
 110         if (INTEL_INFO(dev)->gen >= 3) {
 111                 u32 bsm;
 112
 113                 pci_read_config_dword(dev->pdev, BSM, &bsm);
 114
 115                 base = bsm & BSM_MASK;
 116         } else if (IS_I865G(dev)) {
 117                 u16 toud = 0;
 118
 119                 /*
 120                  * FIXME is the graphics stolen memory region
 121                  * always at TOUD? Ie. is it always the last
 122                  * one to be allocated by the BIOS?
 123                  */
 124                 pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
 125                                          I865_TOUD, &toud);
 126
 127                 base = toud << 16;
 128         } else if (IS_I85X(dev)) {
 129                 u32 tseg_size = 0;
 130                 u32 tom;
 131                 u8 tmp;
 132
 133                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 134                                          I85X_ESMRAMC, &tmp);
 135
 136                 if (tmp & TSEG_ENABLE)
 137                         tseg_size = MB(1);
 138
 139                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1),
 140                                          I85X_DRB3, &tmp);
 141                 tom = tmp * MB(32);
 142
 143                 base = tom - tseg_size - ggtt->stolen_size;
 144         } else if (IS_845G(dev)) {
 145                 u32 tseg_size = 0;
 146                 u32 tom;
 147                 u8 tmp;
 148
 149                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 150                                          I845_ESMRAMC, &tmp);
 151
 152                 if (tmp & TSEG_ENABLE) {
 153                         switch (tmp & I845_TSEG_SIZE_MASK) {
 154                         case I845_TSEG_SIZE_512K:
 155                                 tseg_size = KB(512);
 156                                 break;
 157                         case I845_TSEG_SIZE_1M:
 158                                 tseg_size = MB(1);
 159                                 break;
 160                         }
 161                 }
 162
 163                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 164                                          I830_DRB3, &tmp);
 165                 tom = tmp * MB(32);
 166
 167                 base = tom - tseg_size - ggtt->stolen_size;
 168         } else if (IS_I830(dev)) {
 169                 u32 tseg_size = 0;
 170                 u32 tom;
 171                 u8 tmp;
 172
 173                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 174                                          I830_ESMRAMC, &tmp);
 175
 176                 if (tmp & TSEG_ENABLE) {
 177                         if (tmp & I830_TSEG_SIZE_1M)
 178                                 tseg_size = MB(1);
 179                         else
 180                                 tseg_size = KB(512);
 181                 }
 182
 183                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 184                                          I830_DRB3, &tmp);
 185                 tom = tmp * MB(32);
 186
 187                 base = tom - tseg_size - ggtt->stolen_size;
 188         }
 189
 190         if (base == 0)
 191                 return 0;
 192
 193         /* make sure we don't clobber the GTT if it's within stolen memory */
 194         if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
 195                 struct {
 196                         u32 start, end;
 197                 } stolen[2] = {
 198                         { .start = base, .end = base + ggtt->stolen_size, },
 199                         { .start = base, .end = base + ggtt->stolen_size, },
 200                 };
 201                 u64 ggtt_start, ggtt_end;
 202
 203                 ggtt_start = I915_READ(PGTBL_CTL);
 204                 if (IS_GEN4(dev))
 205                         ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
 206                                      (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
 207                 else
 208                         ggtt_start &= PGTBL_ADDRESS_LO_MASK;
 209                 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
 210
 211                 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
 212                         stolen[0].end = ggtt_start;
 213                 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
 214                         stolen[1].start = ggtt_end;
 215
 216                 /* pick the larger of the two chunks */
 217                 if (stolen[0].end - stolen[0].start >
 218                     stolen[1].end - stolen[1].start) {
 219                         base = stolen[0].start;
 220                         ggtt->stolen_size = stolen[0].end - stolen[0].start;
 221                 } else {
 222                         base = stolen[1].start;
 223                         ggtt->stolen_size = stolen[1].end - stolen[1].start;
 224                 }
 225
 226                 if (stolen[0].start != stolen[1].start ||
 227                     stolen[0].end != stolen[1].end) {
 228                         DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
 229                                       (unsigned long long)ggtt_start,
 230                                       (unsigned long long)ggtt_end - 1);
 231                         DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
 232                                       base, base + (u32)ggtt->stolen_size - 1);
 233                 }
 234         }
 235
 236
 237         /* Verify that nothing else uses this physical address. Stolen
 238          * memory should be reserved by the BIOS and hidden from the
 239          * kernel. So if the region is already marked as busy, something
 240          * is seriously wrong.
 241          */
 242 #if 0
 243         r = devm_request_mem_region(dev->dev, base, ggtt->stolen_size,
 244                                     "Graphics Stolen Memory");
 245         if (r == NULL) {
 246                 /*
 247                  * One more attempt but this time requesting region from
 248                  * base + 1, as we have seen that this resolves the region
 249                  * conflict with the PCI Bus.
 250                  * This is a BIOS w/a: Some BIOS wrap stolen in the root
 251                  * PCI bus, but have an off-by-one error. Hence retry the
 252                  * reservation starting from 1 instead of 0.
 253                  */
 254                 r = devm_request_mem_region(dev->dev, base + 1,
 255                                             ggtt->stolen_size - 1,
 256                                             "Graphics Stolen Memory");
 257                 /*
 258                  * GEN3 firmware likes to smash pci bridges into the stolen
 259                  * range. Apparently this works.
 260                  */
 261                 if (r == NULL && !IS_GEN3(dev)) {
 262                         DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
 263                                   base, base + (uint32_t)ggtt->stolen_size);
 264                         base = 0;
 265                 }
 266         }
 267 #endif
 268
 269         return base;
 270 }
 271
 272 void i915_gem_cleanup_stolen(struct drm_device *dev)
 273 {
 274         struct drm_i915_private *dev_priv = dev->dev_private;
 275
 276         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 277                 return;
 278
 279         drm_mm_takedown(&dev_priv->mm.stolen);
 280 }
 281
 282 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 283                                     unsigned long *base, unsigned long *size)
 284 {
 285         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 286         uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 287                                      CTG_STOLEN_RESERVED :
 288                                      ELK_STOLEN_RESERVED);
 289         unsigned long stolen_top = dev_priv->mm.stolen_base +
 290                                    ggtt->stolen_size;
 291
 292         *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 293
 294         WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
 295
 296         /* On these platforms, the register doesn't have a size field, so the
 297          * size is the distance between the base and the top of the stolen
 298          * memory. We also have the genuine case where base is zero and there's
 299          * nothing reserved. */
 300         if (*base == 0)
 301                 *size = 0;
 302         else
 303                 *size = stolen_top - *base;
 304 }
 305
 306 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 307                                      unsigned long *base, unsigned long *size)
 308 {
 309         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 310
 311         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 312
 313         switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
 314         case GEN6_STOLEN_RESERVED_1M:
 315                 *size = 1024 * 1024;
 316                 break;
 317         case GEN6_STOLEN_RESERVED_512K:
 318                 *size = 512 * 1024;
 319                 break;
 320         case GEN6_STOLEN_RESERVED_256K:
 321                 *size = 256 * 1024;
 322                 break;
 323         case GEN6_STOLEN_RESERVED_128K:
 324                 *size = 128 * 1024;
 325                 break;
 326         default:
 327                 *size = 1024 * 1024;
 328                 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
 329         }
 330 }
 331
 332 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 333                                      unsigned long *base, unsigned long *size)
 334 {
 335         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 336
 337         *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
 338
 339         switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
 340         case GEN7_STOLEN_RESERVED_1M:
 341                 *size = 1024 * 1024;
 342                 break;
 343         case GEN7_STOLEN_RESERVED_256K:
 344                 *size = 256 * 1024;
 345                 break;
 346         default:
 347                 *size = 1024 * 1024;
 348                 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
 349         }
 350 }
 351
 352 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
 353                                      unsigned long *base, unsigned long *size)
 354 {
 355         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 356
 357         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 358
 359         switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
 360         case GEN8_STOLEN_RESERVED_1M:
 361                 *size = 1024 * 1024;
 362                 break;
 363         case GEN8_STOLEN_RESERVED_2M:
 364                 *size = 2 * 1024 * 1024;
 365                 break;
 366         case GEN8_STOLEN_RESERVED_4M:
 367                 *size = 4 * 1024 * 1024;
 368                 break;
 369         case GEN8_STOLEN_RESERVED_8M:
 370                 *size = 8 * 1024 * 1024;
 371                 break;
 372         default:
 373                 *size = 8 * 1024 * 1024;
 374                 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
 375         }
 376 }
 377
 378 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 379                                     unsigned long *base, unsigned long *size)
 380 {
 381         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 382         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 383         unsigned long stolen_top;
 384
 385         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 386
 387         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 388
 389         /* On these platforms, the register doesn't have a size field, so the
 390          * size is the distance between the base and the top of the stolen
 391          * memory. We also have the genuine case where base is zero and there's
 392          * nothing reserved. */
 393         if (*base == 0)
 394                 *size = 0;
 395         else
 396                 *size = stolen_top - *base;
 397 }
 398
 399 int i915_gem_init_stolen(struct drm_device *dev)
 400 {
 401         struct drm_i915_private *dev_priv = to_i915(dev);
 402         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 403         unsigned long reserved_total, reserved_base = 0, reserved_size;
 404         unsigned long stolen_top;
 405
 406         lockinit(&dev_priv->mm.stolen_lock, "i915msl", 0, LK_CANRECURSE);
 407 #ifdef __DragonFly__
 408         /* Stolen memory support is still incomplete */
 409         return 0;
 410 #endif
 411
 412 #ifdef CONFIG_INTEL_IOMMU
 413         if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
 414                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 415                 return 0;
 416         }
 417 #endif
 418
 419         if (ggtt->stolen_size == 0)
 420                 return 0;
 421
 422         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
 423         if (dev_priv->mm.stolen_base == 0)
 424                 return 0;
 425
 426         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 427
 428         switch (INTEL_INFO(dev_priv)->gen) {
 429         case 2:
 430         case 3:
 431                 break;
 432         case 4:
 433                 if (IS_G4X(dev))
 434                         g4x_get_stolen_reserved(dev_priv, &reserved_base,
 435                                                 &reserved_size);
 436                 break;
 437         case 5:
 438                 /* Assume the gen6 maximum for the older platforms. */
 439                 reserved_size = 1024 * 1024;
 440                 reserved_base = stolen_top - reserved_size;
 441                 break;
 442         case 6:
 443                 gen6_get_stolen_reserved(dev_priv, &reserved_base,
 444                                          &reserved_size);
 445                 break;
 446         case 7:
 447                 gen7_get_stolen_reserved(dev_priv, &reserved_base,
 448                                          &reserved_size);
 449                 break;
 450         default:
 451                 if (IS_BROADWELL(dev_priv) ||
 452                     IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev))
 453                         bdw_get_stolen_reserved(dev_priv, &reserved_base,
 454                                                 &reserved_size);
 455                 else
 456                         gen8_get_stolen_reserved(dev_priv, &reserved_base,
 457                                                  &reserved_size);
 458                 break;
 459         }
 460
 461         /* It is possible for the reserved base to be zero, but the register
 462          * field for size doesn't have a zero option. */
 463         if (reserved_base == 0) {
 464                 reserved_size = 0;
 465                 reserved_base = stolen_top;
 466         }
 467
 468         if (reserved_base < dev_priv->mm.stolen_base ||
 469             reserved_base + reserved_size > stolen_top) {
 470                 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
 471                               reserved_base, reserved_base + reserved_size,
 472                               dev_priv->mm.stolen_base, stolen_top);
 473                 return 0;
 474         }
 475
 476         ggtt->stolen_reserved_base = reserved_base;
 477         ggtt->stolen_reserved_size = reserved_size;
 478
 479         /* It is possible for the reserved area to end before the end of stolen
 480          * memory, so just consider the start. */
 481         reserved_total = stolen_top - reserved_base;
 482
 483         DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
 484                       ggtt->stolen_size >> 10,
 485                       (ggtt->stolen_size - reserved_total) >> 10);
 486
 487         ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total;
 488
 489         /*
 490          * Basic memrange allocator for stolen space.
 491          *
 492          * TODO: Notice that some platforms require us to not use the first page
 493          * of the stolen memory but their BIOSes may still put the framebuffer
 494          * on the first page. So we don't reserve this page for now because of
 495          * that. Our current solution is to just prevent new nodes from being
 496          * inserted on the first page - see the check we have at
 497          * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
 498          * problem later.
 499          */
 500         drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->stolen_usable_size);
 501
 502         return 0;
 503 }
 504
 505 static struct sg_table *
 506 i915_pages_create_for_stolen(struct drm_device *dev,
 507                              u32 offset, u32 size)
 508 {
 509         struct drm_i915_private *dev_priv = to_i915(dev);
 510         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 511         struct sg_table *st;
 512         struct scatterlist *sg;
 513
 514         DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
 515         BUG_ON(offset > ggtt->stolen_size - size);
 516
 517         /* We hide that we have no struct page backing our stolen object
 518          * by wrapping the contiguous physical allocation with a fake
 519          * dma mapping in a single scatterlist.
 520          */
 521
 522         st = kmalloc(sizeof(*st), M_DRM, M_WAITOK);
 523         if (st == NULL)
 524                 return NULL;
 525
 526         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 527                 kfree(st);
 528                 return NULL;
 529         }
 530
 531         sg = st->sgl;
 532         sg->offset = 0;
 533         sg->length = size;
 534
 535         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 536         sg_dma_len(sg) = size;
 537
 538         return st;
 539 }
 540
 541 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 542 {
 543         BUG();
 544         return -EINVAL;
 545 }
 546
 547 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
 548 {
 549         /* Should only be called during free */
 550         sg_free_table(obj->pages);
 551         kfree(obj->pages);
 552 }
 553
 554
 555 static void
 556 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 557 {
 558         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
 559
 560         if (obj->stolen) {
 561                 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
 562                 kfree(obj->stolen);
 563                 obj->stolen = NULL;
 564         }
 565 }
 566 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 567         .get_pages = i915_gem_object_get_pages_stolen,
 568         .put_pages = i915_gem_object_put_pages_stolen,
 569         .release = i915_gem_object_release_stolen,
 570 };
 571
 572 static struct drm_i915_gem_object *
 573 _i915_gem_object_create_stolen(struct drm_device *dev,
 574                                struct drm_mm_node *stolen)
 575 {
 576         struct drm_i915_gem_object *obj;
 577
 578         obj = i915_gem_object_alloc(dev);
 579         if (obj == NULL)
 580                 return NULL;
 581
 582         drm_gem_private_object_init(dev, &obj->base, stolen->size);
 583         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 584
 585         obj->pages = i915_pages_create_for_stolen(dev,
 586                                                   stolen->start, stolen->size);
 587         if (obj->pages == NULL)
 588                 goto cleanup;
 589
 590         obj->get_page.sg = obj->pages->sgl;
 591         obj->get_page.last = 0;
 592
 593         i915_gem_object_pin_pages(obj);
 594         obj->stolen = stolen;
 595
 596         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 597         obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
 598
 599         return obj;
 600
 601 cleanup:
 602         i915_gem_object_free(obj);
 603         return NULL;
 604 }
 605
 606 struct drm_i915_gem_object *
 607 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
 608 {
 609         struct drm_i915_private *dev_priv = dev->dev_private;
 610         struct drm_i915_gem_object *obj;
 611         struct drm_mm_node *stolen;
 612         int ret;
 613
 614         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 615                 return NULL;
 616
 617         DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
 618         if (size == 0)
 619                 return NULL;
 620
 621         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 622         if (!stolen)
 623                 return NULL;
 624
 625         ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
 626         if (ret) {
 627                 kfree(stolen);
 628                 return NULL;
 629         }
 630
 631         obj = _i915_gem_object_create_stolen(dev, stolen);
 632         if (obj)
 633                 return obj;
 634
 635         i915_gem_stolen_remove_node(dev_priv, stolen);
 636         kfree(stolen);
 637         return NULL;
 638 }
 639
 640 struct drm_i915_gem_object *
 641 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 642                                                u32 stolen_offset,
 643                                                u32 gtt_offset,
 644                                                u32 size)
 645 {
 646         struct drm_i915_private *dev_priv = to_i915(dev);
 647         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 648         struct drm_i915_gem_object *obj;
 649         struct drm_mm_node *stolen;
 650         struct i915_vma *vma;
 651         int ret;
 652
 653         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 654                 return NULL;
 655
 656         lockdep_assert_held(&dev->struct_mutex);
 657
 658         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 659                         stolen_offset, gtt_offset, size);
 660
 661         /* KISS and expect everything to be page-aligned */
 662         if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
 663             WARN_ON(stolen_offset & 4095))
 664                 return NULL;
 665
 666         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 667         if (!stolen)
 668                 return NULL;
 669
 670         stolen->start = stolen_offset;
 671         stolen->size = size;
 672         mutex_lock(&dev_priv->mm.stolen_lock);
 673         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 674         mutex_unlock(&dev_priv->mm.stolen_lock);
 675         if (ret) {
 676                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 677                 kfree(stolen);
 678                 return NULL;
 679         }
 680
 681         obj = _i915_gem_object_create_stolen(dev, stolen);
 682         if (obj == NULL) {
 683                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 684                 i915_gem_stolen_remove_node(dev_priv, stolen);
 685                 kfree(stolen);
 686                 return NULL;
 687         }
 688
 689         /* Some objects just need physical mem from stolen space */
 690         if (gtt_offset == I915_GTT_OFFSET_NONE)
 691                 return obj;
 692
 693         vma = i915_gem_obj_lookup_or_create_vma(obj, &ggtt->base);
 694         if (IS_ERR(vma)) {
 695                 ret = PTR_ERR(vma);
 696                 goto err;
 697         }
 698
 699         /* To simplify the initialisation sequence between KMS and GTT,
 700          * we allow construction of the stolen object prior to
 701          * setting up the GTT space. The actual reservation will occur
 702          * later.
 703          */
 704         vma->node.start = gtt_offset;
 705         vma->node.size = size;
 706         if (drm_mm_initialized(&ggtt->base.mm)) {
 707                 ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node);
 708                 if (ret) {
 709                         DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 710                         goto err;
 711                 }
 712
 713                 vma->bound |= GLOBAL_BIND;
 714                 __i915_vma_set_map_and_fenceable(vma);
 715                 list_add_tail(&vma->vm_link, &ggtt->base.inactive_list);
 716         }
 717
 718         list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
 719         i915_gem_object_pin_pages(obj);
 720
 721         return obj;
 722
 723 err:
 724         drm_gem_object_unreference(&obj->base);
 725         return NULL;
 726 }