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         /* See the comment at the drm_mm_init() call for more about this check.
  58          * WaSkipStolenMemoryFirstPage:bdw,chv (incomplete) */
  59         if (INTEL_INFO(dev_priv)->gen == 8 && start < 4096)
  60                 start = 4096;
  61
  62         mutex_lock(&dev_priv->mm.stolen_lock);
  63         ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
  64                                           alignment, start, end,
  65                                           DRM_MM_SEARCH_DEFAULT);
  66         mutex_unlock(&dev_priv->mm.stolen_lock);
  67
  68         return ret;
  69 }
  70
  71 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
  72                                 struct drm_mm_node *node, u64 size,
  73                                 unsigned alignment)
  74 {
  75         return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
  76                                         alignment, 0,
  77                                         dev_priv->gtt.stolen_usable_size);
  78 }
  79
  80 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
  81                                  struct drm_mm_node *node)
  82 {
  83         mutex_lock(&dev_priv->mm.stolen_lock);
  84         drm_mm_remove_node(node);
  85         mutex_unlock(&dev_priv->mm.stolen_lock);
  86 }
  87
  88 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
  89 {
  90         struct drm_i915_private *dev_priv = dev->dev_private;
  91         struct resource *r;
  92         u32 base;
  93
  94         /* Almost universally we can find the Graphics Base of Stolen Memory
  95          * at offset 0x5c in the igfx configuration space. On a few (desktop)
  96          * machines this is also mirrored in the bridge device at different
  97          * locations, or in the MCHBAR.
  98          *
  99          * On 865 we just check the TOUD register.
 100          *
 101          * On 830/845/85x the stolen memory base isn't available in any
 102          * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
 103          *
 104          */
 105         base = 0;
 106         if (INTEL_INFO(dev)->gen >= 3) {
 107                 /* Read Graphics Base of Stolen Memory directly */
 108                 pci_read_config_dword(dev->pdev, 0x5c, &base);
 109                 base &= ~((1<<20) - 1);
 110         } else if (IS_I865G(dev)) {
 111                 u32 tseg_size = 0;
 112                 u16 toud = 0;
 113                 u8 tmp;
 114
 115                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 116                                          I845_ESMRAMC, &tmp);
 117
 118                 if (tmp & TSEG_ENABLE) {
 119                         switch (tmp & I845_TSEG_SIZE_MASK) {
 120                         case I845_TSEG_SIZE_512K:
 121                                 tseg_size = KB(512);
 122                                 break;
 123                         case I845_TSEG_SIZE_1M:
 124                                 tseg_size = MB(1);
 125                                 break;
 126                         }
 127                 }
 128
 129                 pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
 130                                          I865_TOUD, &toud);
 131
 132                 base = (toud << 16) + tseg_size;
 133         } else if (IS_I85X(dev)) {
 134                 u32 tseg_size = 0;
 135                 u32 tom;
 136                 u8 tmp;
 137
 138                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 139                                          I85X_ESMRAMC, &tmp);
 140
 141                 if (tmp & TSEG_ENABLE)
 142                         tseg_size = MB(1);
 143
 144                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1),
 145                                          I85X_DRB3, &tmp);
 146                 tom = tmp * MB(32);
 147
 148                 base = tom - tseg_size - dev_priv->gtt.stolen_size;
 149         } else if (IS_845G(dev)) {
 150                 u32 tseg_size = 0;
 151                 u32 tom;
 152                 u8 tmp;
 153
 154                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 155                                          I845_ESMRAMC, &tmp);
 156
 157                 if (tmp & TSEG_ENABLE) {
 158                         switch (tmp & I845_TSEG_SIZE_MASK) {
 159                         case I845_TSEG_SIZE_512K:
 160                                 tseg_size = KB(512);
 161                                 break;
 162                         case I845_TSEG_SIZE_1M:
 163                                 tseg_size = MB(1);
 164                                 break;
 165                         }
 166                 }
 167
 168                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 169                                          I830_DRB3, &tmp);
 170                 tom = tmp * MB(32);
 171
 172                 base = tom - tseg_size - dev_priv->gtt.stolen_size;
 173         } else if (IS_I830(dev)) {
 174                 u32 tseg_size = 0;
 175                 u32 tom;
 176                 u8 tmp;
 177
 178                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 179                                          I830_ESMRAMC, &tmp);
 180
 181                 if (tmp & TSEG_ENABLE) {
 182                         if (tmp & I830_TSEG_SIZE_1M)
 183                                 tseg_size = MB(1);
 184                         else
 185                                 tseg_size = KB(512);
 186                 }
 187
 188                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 189                                          I830_DRB3, &tmp);
 190                 tom = tmp * MB(32);
 191
 192                 base = tom - tseg_size - dev_priv->gtt.stolen_size;
 193         }
 194
 195         if (base == 0)
 196                 return 0;
 197
 198         /* make sure we don't clobber the GTT if it's within stolen memory */
 199         if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
 200                 struct {
 201                         u32 start, end;
 202                 } stolen[2] = {
 203                         { .start = base, .end = base + dev_priv->gtt.stolen_size, },
 204                         { .start = base, .end = base + dev_priv->gtt.stolen_size, },
 205                 };
 206                 u64 gtt_start, gtt_end;
 207
 208                 gtt_start = I915_READ(PGTBL_CTL);
 209                 if (IS_GEN4(dev))
 210                         gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) |
 211                                 (gtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
 212                 else
 213                         gtt_start &= PGTBL_ADDRESS_LO_MASK;
 214                 gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;
 215
 216                 if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)
 217                         stolen[0].end = gtt_start;
 218                 if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)
 219                         stolen[1].start = gtt_end;
 220
 221                 /* pick the larger of the two chunks */
 222                 if (stolen[0].end - stolen[0].start >
 223                     stolen[1].end - stolen[1].start) {
 224                         base = stolen[0].start;
 225                         dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;
 226                 } else {
 227                         base = stolen[1].start;
 228                         dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;
 229                 }
 230
 231                 if (stolen[0].start != stolen[1].start ||
 232                     stolen[0].end != stolen[1].end) {
 233                         DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
 234                                       (unsigned long long) gtt_start,
 235                                       (unsigned long long) gtt_end - 1);
 236                         DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
 237                                       base, base + (u32) dev_priv->gtt.stolen_size - 1);
 238                 }
 239         }
 240
 241
 242         /* Verify that nothing else uses this physical address. Stolen
 243          * memory should be reserved by the BIOS and hidden from the
 244          * kernel. So if the region is already marked as busy, something
 245          * is seriously wrong.
 246          */
 247         r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
 248                                     "Graphics Stolen Memory");
 249         if (r == NULL) {
 250                 /*
 251                  * One more attempt but this time requesting region from
 252                  * base + 1, as we have seen that this resolves the region
 253                  * conflict with the PCI Bus.
 254                  * This is a BIOS w/a: Some BIOS wrap stolen in the root
 255                  * PCI bus, but have an off-by-one error. Hence retry the
 256                  * reservation starting from 1 instead of 0.
 257                  */
 258                 r = devm_request_mem_region(dev->dev, base + 1,
 259                                             dev_priv->gtt.stolen_size - 1,
 260                                             "Graphics Stolen Memory");
 261                 /*
 262                  * GEN3 firmware likes to smash pci bridges into the stolen
 263                  * range. Apparently this works.
 264                  */
 265                 if (r == NULL && !IS_GEN3(dev)) {
 266                         DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
 267                                   base, base + (uint32_t)dev_priv->gtt.stolen_size);
 268                         base = 0;
 269                 }
 270         }
 271
 272         return base;
 273 }
 274
 275 void i915_gem_cleanup_stolen(struct drm_device *dev)
 276 {
 277         struct drm_i915_private *dev_priv = dev->dev_private;
 278
 279         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 280                 return;
 281
 282         drm_mm_takedown(&dev_priv->mm.stolen);
 283 }
 284
 285 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 286                                     unsigned long *base, unsigned long *size)
 287 {
 288         uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 289                                      CTG_STOLEN_RESERVED :
 290                                      ELK_STOLEN_RESERVED);
 291         unsigned long stolen_top = dev_priv->mm.stolen_base +
 292                 dev_priv->gtt.stolen_size;
 293
 294         *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 295
 296         WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
 297
 298         /* On these platforms, the register doesn't have a size field, so the
 299          * size is the distance between the base and the top of the stolen
 300          * memory. We also have the genuine case where base is zero and there's
 301          * nothing reserved. */
 302         if (*base == 0)
 303                 *size = 0;
 304         else
 305                 *size = stolen_top - *base;
 306 }
 307
 308 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 309                                      unsigned long *base, unsigned long *size)
 310 {
 311         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 312
 313         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 314
 315         switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
 316         case GEN6_STOLEN_RESERVED_1M:
 317                 *size = 1024 * 1024;
 318                 break;
 319         case GEN6_STOLEN_RESERVED_512K:
 320                 *size = 512 * 1024;
 321                 break;
 322         case GEN6_STOLEN_RESERVED_256K:
 323                 *size = 256 * 1024;
 324                 break;
 325         case GEN6_STOLEN_RESERVED_128K:
 326                 *size = 128 * 1024;
 327                 break;
 328         default:
 329                 *size = 1024 * 1024;
 330                 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
 331         }
 332 }
 333
 334 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 335                                      unsigned long *base, unsigned long *size)
 336 {
 337         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 338
 339         *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
 340
 341         switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
 342         case GEN7_STOLEN_RESERVED_1M:
 343                 *size = 1024 * 1024;
 344                 break;
 345         case GEN7_STOLEN_RESERVED_256K:
 346                 *size = 256 * 1024;
 347                 break;
 348         default:
 349                 *size = 1024 * 1024;
 350                 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
 351         }
 352 }
 353
 354 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
 355                                      unsigned long *base, unsigned long *size)
 356 {
 357         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 358
 359         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 360
 361         switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
 362         case GEN8_STOLEN_RESERVED_1M:
 363                 *size = 1024 * 1024;
 364                 break;
 365         case GEN8_STOLEN_RESERVED_2M:
 366                 *size = 2 * 1024 * 1024;
 367                 break;
 368         case GEN8_STOLEN_RESERVED_4M:
 369                 *size = 4 * 1024 * 1024;
 370                 break;
 371         case GEN8_STOLEN_RESERVED_8M:
 372                 *size = 8 * 1024 * 1024;
 373                 break;
 374         default:
 375                 *size = 8 * 1024 * 1024;
 376                 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
 377         }
 378 }
 379
 380 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 381                                     unsigned long *base, unsigned long *size)
 382 {
 383         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 384         unsigned long stolen_top;
 385
 386         stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
 387
 388         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 389
 390         /* On these platforms, the register doesn't have a size field, so the
 391          * size is the distance between the base and the top of the stolen
 392          * memory. We also have the genuine case where base is zero and there's
 393          * nothing reserved. */
 394         if (*base == 0)
 395                 *size = 0;
 396         else
 397                 *size = stolen_top - *base;
 398 }
 399
 400 int i915_gem_init_stolen(struct drm_device *dev)
 401 {
 402         struct drm_i915_private *dev_priv = dev->dev_private;
 403         unsigned long reserved_total, reserved_base = 0, reserved_size;
 404         unsigned long stolen_top;
 405
 406         mutex_init(&dev_priv->mm.stolen_lock);
 407
 408 #ifdef CONFIG_INTEL_IOMMU
 409         if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
 410                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 411                 return 0;
 412         }
 413 #endif
 414
 415         if (dev_priv->gtt.stolen_size == 0)
 416                 return 0;
 417
 418         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
 419         if (dev_priv->mm.stolen_base == 0)
 420                 return 0;
 421
 422         stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
 423
 424         switch (INTEL_INFO(dev_priv)->gen) {
 425         case 2:
 426         case 3:
 427                 break;
 428         case 4:
 429                 if (IS_G4X(dev))
 430                         g4x_get_stolen_reserved(dev_priv, &reserved_base,
 431                                                 &reserved_size);
 432                 break;
 433         case 5:
 434                 /* Assume the gen6 maximum for the older platforms. */
 435                 reserved_size = 1024 * 1024;
 436                 reserved_base = stolen_top - reserved_size;
 437                 break;
 438         case 6:
 439                 gen6_get_stolen_reserved(dev_priv, &reserved_base,
 440                                          &reserved_size);
 441                 break;
 442         case 7:
 443                 gen7_get_stolen_reserved(dev_priv, &reserved_base,
 444                                          &reserved_size);
 445                 break;
 446         default:
 447                 if (IS_BROADWELL(dev_priv) || IS_SKYLAKE(dev_priv))
 448                         bdw_get_stolen_reserved(dev_priv, &reserved_base,
 449                                                 &reserved_size);
 450                 else
 451                         gen8_get_stolen_reserved(dev_priv, &reserved_base,
 452                                                  &reserved_size);
 453                 break;
 454         }
 455
 456         /* It is possible for the reserved base to be zero, but the register
 457          * field for size doesn't have a zero option. */
 458         if (reserved_base == 0) {
 459                 reserved_size = 0;
 460                 reserved_base = stolen_top;
 461         }
 462
 463         if (reserved_base < dev_priv->mm.stolen_base ||
 464             reserved_base + reserved_size > stolen_top) {
 465                 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
 466                               reserved_base, reserved_base + reserved_size,
 467                               dev_priv->mm.stolen_base, stolen_top);
 468                 return 0;
 469         }
 470
 471         /* It is possible for the reserved area to end before the end of stolen
 472          * memory, so just consider the start. */
 473         reserved_total = stolen_top - reserved_base;
 474
 475         DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
 476                       dev_priv->gtt.stolen_size >> 10,
 477                       (dev_priv->gtt.stolen_size - reserved_total) >> 10);
 478
 479         dev_priv->gtt.stolen_usable_size = dev_priv->gtt.stolen_size -
 480                                            reserved_total;
 481
 482         /*
 483          * Basic memrange allocator for stolen space.
 484          *
 485          * TODO: Notice that some platforms require us to not use the first page
 486          * of the stolen memory but their BIOSes may still put the framebuffer
 487          * on the first page. So we don't reserve this page for now because of
 488          * that. Our current solution is to just prevent new nodes from being
 489          * inserted on the first page - see the check we have at
 490          * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
 491          * problem later.
 492          */
 493         drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_usable_size);
 494
 495         return 0;
 496 }
 497
 498 static struct sg_table *
 499 i915_pages_create_for_stolen(struct drm_device *dev,
 500                              u32 offset, u32 size)
 501 {
 502         struct drm_i915_private *dev_priv = dev->dev_private;
 503         struct sg_table *st;
 504         struct scatterlist *sg;
 505
 506         DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
 507         BUG_ON(offset > dev_priv->gtt.stolen_size - size);
 508
 509         /* We hide that we have no struct page backing our stolen object
 510          * by wrapping the contiguous physical allocation with a fake
 511          * dma mapping in a single scatterlist.
 512          */
 513
 514         st = kmalloc(sizeof(*st), GFP_KERNEL);
 515         if (st == NULL)
 516                 return NULL;
 517
 518         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 519                 kfree(st);
 520                 return NULL;
 521         }
 522
 523         sg = st->sgl;
 524         sg->offset = 0;
 525         sg->length = size;
 526
 527         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 528         sg_dma_len(sg) = size;
 529
 530         return st;
 531 }
 532
 533 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 534 {
 535         BUG();
 536         return -EINVAL;
 537 }
 538
 539 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
 540 {
 541         /* Should only be called during free */
 542         sg_free_table(obj->pages);
 543         kfree(obj->pages);
 544 }
 545
 546
 547 static void
 548 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 549 {
 550         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
 551
 552         if (obj->stolen) {
 553                 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
 554                 kfree(obj->stolen);
 555                 obj->stolen = NULL;
 556         }
 557 }
 558 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 559         .get_pages = i915_gem_object_get_pages_stolen,
 560         .put_pages = i915_gem_object_put_pages_stolen,
 561         .release = i915_gem_object_release_stolen,
 562 };
 563
 564 static struct drm_i915_gem_object *
 565 _i915_gem_object_create_stolen(struct drm_device *dev,
 566                                struct drm_mm_node *stolen)
 567 {
 568         struct drm_i915_gem_object *obj;
 569
 570         obj = i915_gem_object_alloc(dev);
 571         if (obj == NULL)
 572                 return NULL;
 573
 574         drm_gem_private_object_init(dev, &obj->base, stolen->size);
 575         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 576
 577         obj->pages = i915_pages_create_for_stolen(dev,
 578                                                   stolen->start, stolen->size);
 579         if (obj->pages == NULL)
 580                 goto cleanup;
 581
 582         i915_gem_object_pin_pages(obj);
 583         obj->stolen = stolen;
 584
 585         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 586         obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
 587
 588         return obj;
 589
 590 cleanup:
 591         i915_gem_object_free(obj);
 592         return NULL;
 593 }
 594
 595 struct drm_i915_gem_object *
 596 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
 597 {
 598         struct drm_i915_private *dev_priv = dev->dev_private;
 599         struct drm_i915_gem_object *obj;
 600         struct drm_mm_node *stolen;
 601         int ret;
 602
 603         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 604                 return NULL;
 605
 606         DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
 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, 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_device *dev,
 631                                                u32 stolen_offset,
 632                                                u32 gtt_offset,
 633                                                u32 size)
 634 {
 635         struct drm_i915_private *dev_priv = dev->dev_private;
 636         struct i915_address_space *ggtt = &dev_priv->gtt.base;
 637         struct drm_i915_gem_object *obj;
 638         struct drm_mm_node *stolen;
 639         struct i915_vma *vma;
 640         int ret;
 641
 642         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 643                 return NULL;
 644
 645         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 646                         stolen_offset, gtt_offset, size);
 647
 648         /* KISS and expect everything to be page-aligned */
 649         if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
 650             WARN_ON(stolen_offset & 4095))
 651                 return NULL;
 652
 653         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 654         if (!stolen)
 655                 return NULL;
 656
 657         stolen->start = stolen_offset;
 658         stolen->size = size;
 659         mutex_lock(&dev_priv->mm.stolen_lock);
 660         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 661         mutex_unlock(&dev_priv->mm.stolen_lock);
 662         if (ret) {
 663                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 664                 kfree(stolen);
 665                 return NULL;
 666         }
 667
 668         obj = _i915_gem_object_create_stolen(dev, stolen);
 669         if (obj == NULL) {
 670                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 671                 i915_gem_stolen_remove_node(dev_priv, stolen);
 672                 kfree(stolen);
 673                 return NULL;
 674         }
 675
 676         /* Some objects just need physical mem from stolen space */
 677         if (gtt_offset == I915_GTT_OFFSET_NONE)
 678                 return obj;
 679
 680         vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
 681         if (IS_ERR(vma)) {
 682                 ret = PTR_ERR(vma);
 683                 goto err;
 684         }
 685
 686         /* To simplify the initialisation sequence between KMS and GTT,
 687          * we allow construction of the stolen object prior to
 688          * setting up the GTT space. The actual reservation will occur
 689          * later.
 690          */
 691         vma->node.start = gtt_offset;
 692         vma->node.size = size;
 693         if (drm_mm_initialized(&ggtt->mm)) {
 694                 ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
 695                 if (ret) {
 696                         DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 697                         goto err;
 698                 }
 699
 700                 vma->bound |= GLOBAL_BIND;
 701                 __i915_vma_set_map_and_fenceable(vma);
 702                 list_add_tail(&vma->mm_list, &ggtt->inactive_list);
 703         }
 704
 705         list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
 706         i915_gem_object_pin_pages(obj);
 707
 708         return obj;
 709
 710 err:
 711         drm_gem_object_unreference(&obj->base);
 712         return NULL;
 713 }