drivers/gpu/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         mutex_lock(&dev_priv->mm.stolen_lock);
  58         ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
  59                                           alignment, start, end,
  60                                           DRM_MM_SEARCH_DEFAULT);
  61         mutex_unlock(&dev_priv->mm.stolen_lock);
  62
  63         return ret;
  64 }
  65
  66 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
  67                                 struct drm_mm_node *node, u64 size,
  68                                 unsigned alignment)
  69 {
  70         return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
  71                                                     alignment, 0, U64_MAX);
  72 }
  73
  74 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
  75                                  struct drm_mm_node *node)
  76 {
  77         mutex_lock(&dev_priv->mm.stolen_lock);
  78         drm_mm_remove_node(node);
  79         mutex_unlock(&dev_priv->mm.stolen_lock);
  80 }
  81
  82 static unsigned long i915_stolen_to_physical(struct drm_i915_private *dev_priv)
  83 {
  84         struct pci_dev *pdev = dev_priv->drm.pdev;
  85         struct i915_ggtt *ggtt = &dev_priv->ggtt;
  86         struct resource *r;
  87         u32 base;
  88
  89         /* Almost universally we can find the Graphics Base of Stolen Memory
  90          * at register BSM (0x5c) in the igfx configuration space. On a few
  91          * (desktop) machines this is also mirrored in the bridge device at
  92          * different locations, or in the MCHBAR.
  93          *
  94          * On 865 we just check the TOUD register.
  95          *
  96          * On 830/845/85x the stolen memory base isn't available in any
  97          * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
  98          *
  99          */
 100         base = 0;
 101         if (INTEL_GEN(dev_priv) >= 3) {
 102                 u32 bsm;
 103
 104                 pci_read_config_dword(pdev, INTEL_BSM, &bsm);
 105
 106                 base = bsm & INTEL_BSM_MASK;
 107         } else if (IS_I865G(dev_priv)) {
 108                 u32 tseg_size = 0;
 109                 u16 toud = 0;
 110                 u8 tmp;
 111
 112                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 113                                          I845_ESMRAMC, &tmp);
 114
 115                 if (tmp & TSEG_ENABLE) {
 116                         switch (tmp & I845_TSEG_SIZE_MASK) {
 117                         case I845_TSEG_SIZE_512K:
 118                                 tseg_size = KB(512);
 119                                 break;
 120                         case I845_TSEG_SIZE_1M:
 121                                 tseg_size = MB(1);
 122                                 break;
 123                         }
 124                 }
 125
 126                 pci_bus_read_config_word(pdev->bus, PCI_DEVFN(0, 0),
 127                                          I865_TOUD, &toud);
 128
 129                 base = (toud << 16) + tseg_size;
 130         } else if (IS_I85X(dev_priv)) {
 131                 u32 tseg_size = 0;
 132                 u32 tom;
 133                 u8 tmp;
 134
 135                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 136                                          I85X_ESMRAMC, &tmp);
 137
 138                 if (tmp & TSEG_ENABLE)
 139                         tseg_size = MB(1);
 140
 141                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 1),
 142                                          I85X_DRB3, &tmp);
 143                 tom = tmp * MB(32);
 144
 145                 base = tom - tseg_size - ggtt->stolen_size;
 146         } else if (IS_I845G(dev_priv)) {
 147                 u32 tseg_size = 0;
 148                 u32 tom;
 149                 u8 tmp;
 150
 151                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 152                                          I845_ESMRAMC, &tmp);
 153
 154                 if (tmp & TSEG_ENABLE) {
 155                         switch (tmp & I845_TSEG_SIZE_MASK) {
 156                         case I845_TSEG_SIZE_512K:
 157                                 tseg_size = KB(512);
 158                                 break;
 159                         case I845_TSEG_SIZE_1M:
 160                                 tseg_size = MB(1);
 161                                 break;
 162                         }
 163                 }
 164
 165                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 166                                          I830_DRB3, &tmp);
 167                 tom = tmp * MB(32);
 168
 169                 base = tom - tseg_size - ggtt->stolen_size;
 170         } else if (IS_I830(dev_priv)) {
 171                 u32 tseg_size = 0;
 172                 u32 tom;
 173                 u8 tmp;
 174
 175                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 176                                          I830_ESMRAMC, &tmp);
 177
 178                 if (tmp & TSEG_ENABLE) {
 179                         if (tmp & I830_TSEG_SIZE_1M)
 180                                 tseg_size = MB(1);
 181                         else
 182                                 tseg_size = KB(512);
 183                 }
 184
 185                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 186                                          I830_DRB3, &tmp);
 187                 tom = tmp * MB(32);
 188
 189                 base = tom - tseg_size - ggtt->stolen_size;
 190         }
 191
 192         if (base == 0)
 193                 return 0;
 194
 195         /* make sure we don't clobber the GTT if it's within stolen memory */
 196         if (INTEL_GEN(dev_priv) <= 4 &&
 197             !IS_G33(dev_priv) && !IS_PINEVIEW(dev_priv) && !IS_G4X(dev_priv)) {
 198                 struct {
 199                         u32 start, end;
 200                 } stolen[2] = {
 201                         { .start = base, .end = base + ggtt->stolen_size, },
 202                         { .start = base, .end = base + ggtt->stolen_size, },
 203                 };
 204                 u64 ggtt_start, ggtt_end;
 205
 206                 ggtt_start = I915_READ(PGTBL_CTL);
 207                 if (IS_GEN4(dev_priv))
 208                         ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
 209                                      (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
 210                 else
 211                         ggtt_start &= PGTBL_ADDRESS_LO_MASK;
 212                 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
 213
 214                 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
 215                         stolen[0].end = ggtt_start;
 216                 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
 217                         stolen[1].start = ggtt_end;
 218
 219                 /* pick the larger of the two chunks */
 220                 if (stolen[0].end - stolen[0].start >
 221                     stolen[1].end - stolen[1].start) {
 222                         base = stolen[0].start;
 223                         ggtt->stolen_size = stolen[0].end - stolen[0].start;
 224                 } else {
 225                         base = stolen[1].start;
 226                         ggtt->stolen_size = stolen[1].end - stolen[1].start;
 227                 }
 228
 229                 if (stolen[0].start != stolen[1].start ||
 230                     stolen[0].end != stolen[1].end) {
 231                         DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
 232                                       (unsigned long long)ggtt_start,
 233                                       (unsigned long long)ggtt_end - 1);
 234                         DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
 235                                       base, base + (u32)ggtt->stolen_size - 1);
 236                 }
 237         }
 238
 239
 240         /* Verify that nothing else uses this physical address. Stolen
 241          * memory should be reserved by the BIOS and hidden from the
 242          * kernel. So if the region is already marked as busy, something
 243          * is seriously wrong.
 244          */
 245         r = devm_request_mem_region(dev_priv->drm.dev, base, ggtt->stolen_size,
 246                                     "Graphics Stolen Memory");
 247         if (r == NULL) {
 248                 /*
 249                  * One more attempt but this time requesting region from
 250                  * base + 1, as we have seen that this resolves the region
 251                  * conflict with the PCI Bus.
 252                  * This is a BIOS w/a: Some BIOS wrap stolen in the root
 253                  * PCI bus, but have an off-by-one error. Hence retry the
 254                  * reservation starting from 1 instead of 0.
 255                  */
 256                 r = devm_request_mem_region(dev_priv->drm.dev, base + 1,
 257                                             ggtt->stolen_size - 1,
 258                                             "Graphics Stolen Memory");
 259                 /*
 260                  * GEN3 firmware likes to smash pci bridges into the stolen
 261                  * range. Apparently this works.
 262                  */
 263                 if (r == NULL && !IS_GEN3(dev_priv)) {
 264                         DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
 265                                   base, base + (uint32_t)ggtt->stolen_size);
 266                         base = 0;
 267                 }
 268         }
 269
 270         return base;
 271 }
 272
 273 void i915_gem_cleanup_stolen(struct drm_device *dev)
 274 {
 275         struct drm_i915_private *dev_priv = to_i915(dev);
 276
 277         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 278                 return;
 279
 280         drm_mm_takedown(&dev_priv->mm.stolen);
 281 }
 282
 283 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 284                                     phys_addr_t *base, u32 *size)
 285 {
 286         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 287         uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 288                                      CTG_STOLEN_RESERVED :
 289                                      ELK_STOLEN_RESERVED);
 290         phys_addr_t stolen_top = dev_priv->mm.stolen_base + 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                                      phys_addr_t *base, u32 *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                                      phys_addr_t *base, u32 *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 chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
 353                                     phys_addr_t *base, u32 *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                                     phys_addr_t *base, u32 *size)
 380 {
 381         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 382         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 383         phys_addr_t 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_i915_private *dev_priv)
 400 {
 401         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 402         phys_addr_t reserved_base, stolen_top;
 403         u32 reserved_total, reserved_size;
 404         u32 stolen_usable_start;
 405
 406         mutex_init(&dev_priv->mm.stolen_lock);
 407
 408 #ifdef CONFIG_INTEL_IOMMU
 409         if (intel_iommu_gfx_mapped && INTEL_GEN(dev_priv) < 8) {
 410                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 411                 return 0;
 412         }
 413 #endif
 414
 415         if (ggtt->stolen_size == 0)
 416                 return 0;
 417
 418         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev_priv);
 419         if (dev_priv->mm.stolen_base == 0)
 420                 return 0;
 421
 422         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 423         reserved_base = 0;
 424         reserved_size = 0;
 425
 426         switch (INTEL_INFO(dev_priv)->gen) {
 427         case 2:
 428         case 3:
 429                 break;
 430         case 4:
 431                 if (IS_G4X(dev_priv))
 432                         g4x_get_stolen_reserved(dev_priv,
 433                                                 &reserved_base, &reserved_size);
 434                 break;
 435         case 5:
 436                 /* Assume the gen6 maximum for the older platforms. */
 437                 reserved_size = 1024 * 1024;
 438                 reserved_base = stolen_top - reserved_size;
 439                 break;
 440         case 6:
 441                 gen6_get_stolen_reserved(dev_priv,
 442                                          &reserved_base, &reserved_size);
 443                 break;
 444         case 7:
 445                 gen7_get_stolen_reserved(dev_priv,
 446                                          &reserved_base, &reserved_size);
 447                 break;
 448         default:
 449                 if (IS_LP(dev_priv))
 450                         chv_get_stolen_reserved(dev_priv,
 451                                                 &reserved_base, &reserved_size);
 452                 else
 453                         bdw_get_stolen_reserved(dev_priv,
 454                                                 &reserved_base, &reserved_size);
 455                 break;
 456         }
 457
 458         /* It is possible for the reserved base to be zero, but the register
 459          * field for size doesn't have a zero option. */
 460         if (reserved_base == 0) {
 461                 reserved_size = 0;
 462                 reserved_base = stolen_top;
 463         }
 464
 465         if (reserved_base < dev_priv->mm.stolen_base ||
 466             reserved_base + reserved_size > stolen_top) {
 467                 phys_addr_t reserved_top = reserved_base + reserved_size;
 468                 DRM_DEBUG_KMS("Stolen reserved area [%pa - %pa] outside stolen memory [%pa - %pa]\n",
 469                               &reserved_base, &reserved_top,
 470                               &dev_priv->mm.stolen_base, &stolen_top);
 471                 return 0;
 472         }
 473
 474         ggtt->stolen_reserved_base = reserved_base;
 475         ggtt->stolen_reserved_size = reserved_size;
 476
 477         /* It is possible for the reserved area to end before the end of stolen
 478          * memory, so just consider the start. */
 479         reserved_total = stolen_top - reserved_base;
 480
 481         DRM_DEBUG_KMS("Memory reserved for graphics device: %uK, usable: %uK\n",
 482                       ggtt->stolen_size >> 10,
 483                       (ggtt->stolen_size - reserved_total) >> 10);
 484
 485         stolen_usable_start = 0;
 486         /* WaSkipStolenMemoryFirstPage:bdw+ */
 487         if (INTEL_GEN(dev_priv) >= 8)
 488                 stolen_usable_start = 4096;
 489
 490         ggtt->stolen_usable_size =
 491                 ggtt->stolen_size - reserved_total - stolen_usable_start;
 492
 493         /* Basic memrange allocator for stolen space. */
 494         drm_mm_init(&dev_priv->mm.stolen, stolen_usable_start,
 495                     ggtt->stolen_usable_size);
 496
 497         return 0;
 498 }
 499
 500 static struct sg_table *
 501 i915_pages_create_for_stolen(struct drm_device *dev,
 502                              u32 offset, u32 size)
 503 {
 504         struct drm_i915_private *dev_priv = to_i915(dev);
 505         struct sg_table *st;
 506         struct scatterlist *sg;
 507
 508         GEM_BUG_ON(range_overflows(offset, size, dev_priv->ggtt.stolen_size));
 509
 510         /* We hide that we have no struct page backing our stolen object
 511          * by wrapping the contiguous physical allocation with a fake
 512          * dma mapping in a single scatterlist.
 513          */
 514
 515         st = kmalloc(sizeof(*st), GFP_KERNEL);
 516         if (st == NULL)
 517                 return ERR_PTR(-ENOMEM);
 518
 519         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 520                 kfree(st);
 521                 return ERR_PTR(-ENOMEM);
 522         }
 523
 524         sg = st->sgl;
 525         sg->offset = 0;
 526         sg->length = size;
 527
 528         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 529         sg_dma_len(sg) = size;
 530
 531         return st;
 532 }
 533
 534 static struct sg_table *
 535 i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 536 {
 537         return i915_pages_create_for_stolen(obj->base.dev,
 538                                             obj->stolen->start,
 539                                             obj->stolen->size);
 540 }
 541
 542 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
 543                                              struct sg_table *pages)
 544 {
 545         /* Should only be called from i915_gem_object_release_stolen() */
 546         sg_free_table(pages);
 547         kfree(pages);
 548 }
 549
 550 static void
 551 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 552 {
 553         struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
 554         struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
 555
 556         GEM_BUG_ON(!stolen);
 557
 558         __i915_gem_object_unpin_pages(obj);
 559
 560         i915_gem_stolen_remove_node(dev_priv, stolen);
 561         kfree(stolen);
 562 }
 563
 564 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 565         .get_pages = i915_gem_object_get_pages_stolen,
 566         .put_pages = i915_gem_object_put_pages_stolen,
 567         .release = i915_gem_object_release_stolen,
 568 };
 569
 570 static struct drm_i915_gem_object *
 571 _i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
 572                                struct drm_mm_node *stolen)
 573 {
 574         struct drm_i915_gem_object *obj;
 575
 576         obj = i915_gem_object_alloc(dev_priv);
 577         if (obj == NULL)
 578                 return NULL;
 579
 580         drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size);
 581         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 582
 583         obj->stolen = stolen;
 584         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 585         obj->cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE;
 586
 587         if (i915_gem_object_pin_pages(obj))
 588                 goto cleanup;
 589
 590         return obj;
 591
 592 cleanup:
 593         i915_gem_object_free(obj);
 594         return NULL;
 595 }
 596
 597 struct drm_i915_gem_object *
 598 i915_gem_object_create_stolen(struct drm_i915_private *dev_priv, u32 size)
 599 {
 600         struct drm_i915_gem_object *obj;
 601         struct drm_mm_node *stolen;
 602         int ret;
 603
 604         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 605                 return NULL;
 606
 607         if (size == 0)
 608                 return NULL;
 609
 610         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 611         if (!stolen)
 612                 return NULL;
 613
 614         ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
 615         if (ret) {
 616                 kfree(stolen);
 617                 return NULL;
 618         }
 619
 620         obj = _i915_gem_object_create_stolen(dev_priv, stolen);
 621         if (obj)
 622                 return obj;
 623
 624         i915_gem_stolen_remove_node(dev_priv, stolen);
 625         kfree(stolen);
 626         return NULL;
 627 }
 628
 629 struct drm_i915_gem_object *
 630 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv,
 631                                                u32 stolen_offset,
 632                                                u32 gtt_offset,
 633                                                u32 size)
 634 {
 635         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 636         struct drm_i915_gem_object *obj;
 637         struct drm_mm_node *stolen;
 638         struct i915_vma *vma;
 639         int ret;
 640
 641         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 642                 return NULL;
 643
 644         lockdep_assert_held(&dev_priv->drm.struct_mutex);
 645
 646         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 647                         stolen_offset, gtt_offset, size);
 648
 649         /* KISS and expect everything to be page-aligned */
 650         if (WARN_ON(size == 0) ||
 651             WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
 652             WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
 653                 return NULL;
 654
 655         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 656         if (!stolen)
 657                 return NULL;
 658
 659         stolen->start = stolen_offset;
 660         stolen->size = size;
 661         mutex_lock(&dev_priv->mm.stolen_lock);
 662         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 663         mutex_unlock(&dev_priv->mm.stolen_lock);
 664         if (ret) {
 665                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 666                 kfree(stolen);
 667                 return NULL;
 668         }
 669
 670         obj = _i915_gem_object_create_stolen(dev_priv, stolen);
 671         if (obj == NULL) {
 672                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 673                 i915_gem_stolen_remove_node(dev_priv, stolen);
 674                 kfree(stolen);
 675                 return NULL;
 676         }
 677
 678         /* Some objects just need physical mem from stolen space */
 679         if (gtt_offset == I915_GTT_OFFSET_NONE)
 680                 return obj;
 681
 682         ret = i915_gem_object_pin_pages(obj);
 683         if (ret)
 684                 goto err;
 685
 686         vma = i915_vma_instance(obj, &ggtt->base, NULL);
 687         if (IS_ERR(vma)) {
 688                 ret = PTR_ERR(vma);
 689                 goto err_pages;
 690         }
 691
 692         /* To simplify the initialisation sequence between KMS and GTT,
 693          * we allow construction of the stolen object prior to
 694          * setting up the GTT space. The actual reservation will occur
 695          * later.
 696          */
 697         ret = i915_gem_gtt_reserve(&ggtt->base, &vma->node,
 698                                    size, gtt_offset, obj->cache_level,
 699                                    0);
 700         if (ret) {
 701                 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 702                 goto err_pages;
 703         }
 704
 705         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 706
 707         vma->pages = obj->mm.pages;
 708         vma->flags |= I915_VMA_GLOBAL_BIND;
 709         __i915_vma_set_map_and_fenceable(vma);
 710         list_move_tail(&vma->vm_link, &ggtt->base.inactive_list);
 711         list_move_tail(&obj->global_link, &dev_priv->mm.bound_list);
 712         obj->bind_count++;
 713
 714         return obj;
 715
 716 err_pages:
 717         i915_gem_object_unpin_pages(obj);
 718 err:
 719         i915_gem_object_put(obj);
 720         return NULL;
 721 }