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 (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         u32 base;
  92
  93         /* Almost universally we can find the Graphics Base of Stolen Memory
  94          * at offset 0x5c in the igfx configuration space. On a few (desktop)
  95          * machines this is also mirrored in the bridge device at different
  96          * locations, or in the MCHBAR.
  97          *
  98          * On 865 we just check the TOUD register.
  99          *
 100          * On 830/845/85x the stolen memory base isn't available in any
 101          * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
 102          *
 103          */
 104         base = 0;
 105         if (INTEL_INFO(dev)->gen >= 3) {
 106                 /* Read Graphics Base of Stolen Memory directly */
 107                 pci_read_config_dword(dev->pdev, 0x5c, &base);
 108                 base &= ~((1<<20) - 1);
 109 #if 0
 110         } else if (IS_I865G(dev)) {
 111                 u16 toud = 0;
 112
 113                 /*
 114                  * FIXME is the graphics stolen memory region
 115                  * always at TOUD? Ie. is it always the last
 116                  * one to be allocated by the BIOS?
 117                  */
 118                 pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
 119                                          I865_TOUD, &toud);
 120
 121                 base = toud << 16;
 122         } else if (IS_I85X(dev)) {
 123                 u32 tseg_size = 0;
 124                 u32 tom;
 125                 u8 tmp;
 126
 127                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 128                                          I85X_ESMRAMC, &tmp);
 129
 130                 if (tmp & TSEG_ENABLE)
 131                         tseg_size = MB(1);
 132
 133                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1),
 134                                          I85X_DRB3, &tmp);
 135                 tom = tmp * MB(32);
 136
 137                 base = tom - tseg_size - dev_priv->gtt.stolen_size;
 138         } else if (IS_845G(dev)) {
 139                 u32 tseg_size = 0;
 140                 u32 tom;
 141                 u8 tmp;
 142
 143                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 144                                          I845_ESMRAMC, &tmp);
 145
 146                 if (tmp & TSEG_ENABLE) {
 147                         switch (tmp & I845_TSEG_SIZE_MASK) {
 148                         case I845_TSEG_SIZE_512K:
 149                                 tseg_size = KB(512);
 150                                 break;
 151                         case I845_TSEG_SIZE_1M:
 152                                 tseg_size = MB(1);
 153                                 break;
 154                         }
 155                 }
 156
 157                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 158                                          I830_DRB3, &tmp);
 159                 tom = tmp * MB(32);
 160
 161                 base = tom - tseg_size - dev_priv->gtt.stolen_size;
 162         } else if (IS_I830(dev)) {
 163                 u32 tseg_size = 0;
 164                 u32 tom;
 165                 u8 tmp;
 166
 167                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 168                                          I830_ESMRAMC, &tmp);
 169
 170                 if (tmp & TSEG_ENABLE) {
 171                         if (tmp & I830_TSEG_SIZE_1M)
 172                                 tseg_size = MB(1);
 173                         else
 174                                 tseg_size = KB(512);
 175                 }
 176
 177                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 178                                          I830_DRB3, &tmp);
 179                 tom = tmp * MB(32);
 180
 181                 base = tom - tseg_size - dev_priv->gtt.stolen_size;
 182 #endif
 183         }
 184
 185         if (base == 0)
 186                 return 0;
 187
 188         /* make sure we don't clobber the GTT if it's within stolen memory */
 189         if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
 190                 struct {
 191                         u32 start, end;
 192                 } stolen[2] = {
 193                         { .start = base, .end = base + dev_priv->gtt.stolen_size, },
 194                         { .start = base, .end = base + dev_priv->gtt.stolen_size, },
 195                 };
 196                 u64 gtt_start, gtt_end;
 197
 198                 gtt_start = I915_READ(PGTBL_CTL);
 199                 if (IS_GEN4(dev))
 200                         gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) |
 201                                 (gtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
 202                 else
 203                         gtt_start &= PGTBL_ADDRESS_LO_MASK;
 204                 gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;
 205
 206                 if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)
 207                         stolen[0].end = gtt_start;
 208                 if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)
 209                         stolen[1].start = gtt_end;
 210
 211                 /* pick the larger of the two chunks */
 212                 if (stolen[0].end - stolen[0].start >
 213                     stolen[1].end - stolen[1].start) {
 214                         base = stolen[0].start;
 215                         dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;
 216                 } else {
 217                         base = stolen[1].start;
 218                         dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;
 219                 }
 220
 221                 if (stolen[0].start != stolen[1].start ||
 222                     stolen[0].end != stolen[1].end) {
 223                         DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
 224                                       (unsigned long long) gtt_start,
 225                                       (unsigned long long) gtt_end - 1);
 226                         DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
 227                                       base, base + (u32) dev_priv->gtt.stolen_size - 1);
 228                 }
 229         }
 230
 231
 232         /* Verify that nothing else uses this physical address. Stolen
 233          * memory should be reserved by the BIOS and hidden from the
 234          * kernel. So if the region is already marked as busy, something
 235          * is seriously wrong.
 236          */
 237 #if 0
 238         r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
 239                                     "Graphics Stolen Memory");
 240         if (r == NULL) {
 241                 /*
 242                  * One more attempt but this time requesting region from
 243                  * base + 1, as we have seen that this resolves the region
 244                  * conflict with the PCI Bus.
 245                  * This is a BIOS w/a: Some BIOS wrap stolen in the root
 246                  * PCI bus, but have an off-by-one error. Hence retry the
 247                  * reservation starting from 1 instead of 0.
 248                  */
 249                 r = devm_request_mem_region(dev->dev, base + 1,
 250                                             dev_priv->gtt.stolen_size - 1,
 251                                             "Graphics Stolen Memory");
 252                 /*
 253                  * GEN3 firmware likes to smash pci bridges into the stolen
 254                  * range. Apparently this works.
 255                  */
 256                 if (r == NULL && !IS_GEN3(dev)) {
 257                         DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
 258                                   base, base + (uint32_t)dev_priv->gtt.stolen_size);
 259                         base = 0;
 260                 }
 261         }
 262 #endif
 263
 264         return base;
 265 }
 266
 267 void i915_gem_cleanup_stolen(struct drm_device *dev)
 268 {
 269         struct drm_i915_private *dev_priv = dev->dev_private;
 270
 271         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 272                 return;
 273
 274         drm_mm_takedown(&dev_priv->mm.stolen);
 275 }
 276
 277 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 278                                     unsigned long *base, unsigned long *size)
 279 {
 280         uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 281                                      CTG_STOLEN_RESERVED :
 282                                      ELK_STOLEN_RESERVED);
 283         unsigned long stolen_top = dev_priv->mm.stolen_base +
 284                 dev_priv->gtt.stolen_size;
 285
 286         *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 287
 288         WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
 289
 290         /* On these platforms, the register doesn't have a size field, so the
 291          * size is the distance between the base and the top of the stolen
 292          * memory. We also have the genuine case where base is zero and there's
 293          * nothing reserved. */
 294         if (*base == 0)
 295                 *size = 0;
 296         else
 297                 *size = stolen_top - *base;
 298 }
 299
 300 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 301                                      unsigned long *base, unsigned long *size)
 302 {
 303         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 304
 305         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 306
 307         switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
 308         case GEN6_STOLEN_RESERVED_1M:
 309                 *size = 1024 * 1024;
 310                 break;
 311         case GEN6_STOLEN_RESERVED_512K:
 312                 *size = 512 * 1024;
 313                 break;
 314         case GEN6_STOLEN_RESERVED_256K:
 315                 *size = 256 * 1024;
 316                 break;
 317         case GEN6_STOLEN_RESERVED_128K:
 318                 *size = 128 * 1024;
 319                 break;
 320         default:
 321                 *size = 1024 * 1024;
 322                 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
 323         }
 324 }
 325
 326 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 327                                      unsigned long *base, unsigned long *size)
 328 {
 329         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 330
 331         *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
 332
 333         switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
 334         case GEN7_STOLEN_RESERVED_1M:
 335                 *size = 1024 * 1024;
 336                 break;
 337         case GEN7_STOLEN_RESERVED_256K:
 338                 *size = 256 * 1024;
 339                 break;
 340         default:
 341                 *size = 1024 * 1024;
 342                 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
 343         }
 344 }
 345
 346 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
 347                                      unsigned long *base, unsigned long *size)
 348 {
 349         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 350
 351         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 352
 353         switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
 354         case GEN8_STOLEN_RESERVED_1M:
 355                 *size = 1024 * 1024;
 356                 break;
 357         case GEN8_STOLEN_RESERVED_2M:
 358                 *size = 2 * 1024 * 1024;
 359                 break;
 360         case GEN8_STOLEN_RESERVED_4M:
 361                 *size = 4 * 1024 * 1024;
 362                 break;
 363         case GEN8_STOLEN_RESERVED_8M:
 364                 *size = 8 * 1024 * 1024;
 365                 break;
 366         default:
 367                 *size = 8 * 1024 * 1024;
 368                 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
 369         }
 370 }
 371
 372 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 373                                     unsigned long *base, unsigned long *size)
 374 {
 375         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 376         unsigned long stolen_top;
 377
 378         stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
 379
 380         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 381
 382         /* On these platforms, the register doesn't have a size field, so the
 383          * size is the distance between the base and the top of the stolen
 384          * memory. We also have the genuine case where base is zero and there's
 385          * nothing reserved. */
 386         if (*base == 0)
 387                 *size = 0;
 388         else
 389                 *size = stolen_top - *base;
 390 }
 391
 392 int i915_gem_init_stolen(struct drm_device *dev)
 393 {
 394         struct drm_i915_private *dev_priv = dev->dev_private;
 395         unsigned long reserved_total, reserved_base = 0, reserved_size;
 396         unsigned long stolen_top;
 397
 398         lockinit(&dev_priv->mm.stolen_lock, "i915msl", 0, LK_CANRECURSE);
 399
 400 #ifdef CONFIG_INTEL_IOMMU
 401         if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
 402                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 403                 return 0;
 404         }
 405 #endif
 406
 407         if (dev_priv->gtt.stolen_size == 0)
 408                 return 0;
 409
 410         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
 411         if (dev_priv->mm.stolen_base == 0)
 412                 return 0;
 413
 414         stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
 415
 416         switch (INTEL_INFO(dev_priv)->gen) {
 417         case 2:
 418         case 3:
 419                 break;
 420         case 4:
 421                 if (IS_G4X(dev))
 422                         g4x_get_stolen_reserved(dev_priv, &reserved_base,
 423                                                 &reserved_size);
 424                 break;
 425         case 5:
 426                 /* Assume the gen6 maximum for the older platforms. */
 427                 reserved_size = 1024 * 1024;
 428                 reserved_base = stolen_top - reserved_size;
 429                 break;
 430         case 6:
 431                 gen6_get_stolen_reserved(dev_priv, &reserved_base,
 432                                          &reserved_size);
 433                 break;
 434         case 7:
 435                 gen7_get_stolen_reserved(dev_priv, &reserved_base,
 436                                          &reserved_size);
 437                 break;
 438         default:
 439                 if (IS_BROADWELL(dev_priv) || IS_SKYLAKE(dev_priv))
 440                         bdw_get_stolen_reserved(dev_priv, &reserved_base,
 441                                                 &reserved_size);
 442                 else
 443                         gen8_get_stolen_reserved(dev_priv, &reserved_base,
 444                                                  &reserved_size);
 445                 break;
 446         }
 447
 448         /* It is possible for the reserved base to be zero, but the register
 449          * field for size doesn't have a zero option. */
 450         if (reserved_base == 0) {
 451                 reserved_size = 0;
 452                 reserved_base = stolen_top;
 453         }
 454
 455         if (reserved_base < dev_priv->mm.stolen_base ||
 456             reserved_base + reserved_size > stolen_top) {
 457                 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
 458                               reserved_base, reserved_base + reserved_size,
 459                               dev_priv->mm.stolen_base, stolen_top);
 460                 return 0;
 461         }
 462
 463         /* It is possible for the reserved area to end before the end of stolen
 464          * memory, so just consider the start. */
 465         reserved_total = stolen_top - reserved_base;
 466
 467         DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
 468                       dev_priv->gtt.stolen_size >> 10,
 469                       (dev_priv->gtt.stolen_size - reserved_total) >> 10);
 470
 471         dev_priv->gtt.stolen_usable_size = dev_priv->gtt.stolen_size -
 472                                            reserved_total;
 473
 474         /*
 475          * Basic memrange allocator for stolen space.
 476          *
 477          * TODO: Notice that some platforms require us to not use the first page
 478          * of the stolen memory but their BIOSes may still put the framebuffer
 479          * on the first page. So we don't reserve this page for now because of
 480          * that. Our current solution is to just prevent new nodes from being
 481          * inserted on the first page - see the check we have at
 482          * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
 483          * problem later.
 484          */
 485         drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_usable_size);
 486
 487         return 0;
 488 }
 489
 490 static struct sg_table *
 491 i915_pages_create_for_stolen(struct drm_device *dev,
 492                              u32 offset, u32 size)
 493 {
 494         struct drm_i915_private *dev_priv = dev->dev_private;
 495         struct sg_table *st;
 496         struct scatterlist *sg;
 497
 498         DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
 499         BUG_ON(offset > dev_priv->gtt.stolen_size - size);
 500
 501         /* We hide that we have no struct page backing our stolen object
 502          * by wrapping the contiguous physical allocation with a fake
 503          * dma mapping in a single scatterlist.
 504          */
 505
 506         st = kmalloc(sizeof(*st), M_DRM, M_WAITOK);
 507         if (st == NULL)
 508                 return NULL;
 509
 510         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 511                 kfree(st);
 512                 return NULL;
 513         }
 514
 515         sg = st->sgl;
 516         sg->offset = 0;
 517         sg->length = size;
 518
 519         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 520         sg_dma_len(sg) = size;
 521
 522         return st;
 523 }
 524
 525 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 526 {
 527         BUG();
 528         return -EINVAL;
 529 }
 530
 531 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
 532 {
 533         /* Should only be called during free */
 534         sg_free_table(obj->pages);
 535         kfree(obj->pages);
 536 }
 537
 538
 539 static void
 540 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 541 {
 542         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
 543
 544         if (obj->stolen) {
 545                 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
 546                 kfree(obj->stolen);
 547                 obj->stolen = NULL;
 548         }
 549 }
 550 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 551         .get_pages = i915_gem_object_get_pages_stolen,
 552         .put_pages = i915_gem_object_put_pages_stolen,
 553         .release = i915_gem_object_release_stolen,
 554 };
 555
 556 static struct drm_i915_gem_object *
 557 _i915_gem_object_create_stolen(struct drm_device *dev,
 558                                struct drm_mm_node *stolen)
 559 {
 560         struct drm_i915_gem_object *obj;
 561
 562         obj = i915_gem_object_alloc(dev);
 563         if (obj == NULL)
 564                 return NULL;
 565
 566         drm_gem_private_object_init(dev, &obj->base, stolen->size);
 567         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 568
 569         obj->pages = i915_pages_create_for_stolen(dev,
 570                                                   stolen->start, stolen->size);
 571         if (obj->pages == NULL)
 572                 goto cleanup;
 573
 574         i915_gem_object_pin_pages(obj);
 575         obj->stolen = stolen;
 576
 577         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 578         obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
 579
 580         return obj;
 581
 582 cleanup:
 583         i915_gem_object_free(obj);
 584         return NULL;
 585 }
 586
 587 struct drm_i915_gem_object *
 588 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
 589 {
 590         struct drm_i915_private *dev_priv = dev->dev_private;
 591         struct drm_i915_gem_object *obj;
 592         struct drm_mm_node *stolen;
 593         int ret;
 594
 595         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 596                 return NULL;
 597
 598         DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
 599         if (size == 0)
 600                 return NULL;
 601
 602         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 603         if (!stolen)
 604                 return NULL;
 605
 606         ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
 607         if (ret) {
 608                 kfree(stolen);
 609                 return NULL;
 610         }
 611
 612         obj = _i915_gem_object_create_stolen(dev, stolen);
 613         if (obj)
 614                 return obj;
 615
 616         i915_gem_stolen_remove_node(dev_priv, stolen);
 617         kfree(stolen);
 618         return NULL;
 619 }
 620
 621 struct drm_i915_gem_object *
 622 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 623                                                u32 stolen_offset,
 624                                                u32 gtt_offset,
 625                                                u32 size)
 626 {
 627         struct drm_i915_private *dev_priv = dev->dev_private;
 628         struct i915_address_space *ggtt = &dev_priv->gtt.base;
 629         struct drm_i915_gem_object *obj;
 630         struct drm_mm_node *stolen;
 631         struct i915_vma *vma;
 632         int ret;
 633
 634         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 635                 return NULL;
 636
 637         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 638                         stolen_offset, gtt_offset, size);
 639
 640         /* KISS and expect everything to be page-aligned */
 641         if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
 642             WARN_ON(stolen_offset & 4095))
 643                 return NULL;
 644
 645         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 646         if (!stolen)
 647                 return NULL;
 648
 649         stolen->start = stolen_offset;
 650         stolen->size = size;
 651         mutex_lock(&dev_priv->mm.stolen_lock);
 652         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 653         mutex_unlock(&dev_priv->mm.stolen_lock);
 654         if (ret) {
 655                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 656                 kfree(stolen);
 657                 return NULL;
 658         }
 659
 660         obj = _i915_gem_object_create_stolen(dev, stolen);
 661         if (obj == NULL) {
 662                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 663                 i915_gem_stolen_remove_node(dev_priv, stolen);
 664                 kfree(stolen);
 665                 return NULL;
 666         }
 667
 668         /* Some objects just need physical mem from stolen space */
 669         if (gtt_offset == I915_GTT_OFFSET_NONE)
 670                 return obj;
 671
 672         vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
 673         if (IS_ERR(vma)) {
 674                 ret = PTR_ERR(vma);
 675                 goto err;
 676         }
 677
 678         /* To simplify the initialisation sequence between KMS and GTT,
 679          * we allow construction of the stolen object prior to
 680          * setting up the GTT space. The actual reservation will occur
 681          * later.
 682          */
 683         vma->node.start = gtt_offset;
 684         vma->node.size = size;
 685         if (drm_mm_initialized(&ggtt->mm)) {
 686                 ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
 687                 if (ret) {
 688                         DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 689                         goto err;
 690                 }
 691
 692                 vma->bound |= GLOBAL_BIND;
 693                 __i915_vma_set_map_and_fenceable(vma);
 694                 list_add_tail(&vma->mm_list, &ggtt->inactive_list);
 695         }
 696
 697         list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
 698         i915_gem_object_pin_pages(obj);
 699
 700         return obj;
 701
 702 err:
 703         drm_gem_object_unreference(&obj->base);
 704         return NULL;
 705 }