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,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         struct resource *r;
  97         u32 base;
  98
  99         /* Almost universally we can find the Graphics Base of Stolen Memory
 100          * at register BSM (0x5c) in the igfx configuration space. On a few
 101          * (desktop) machines this is also mirrored in the bridge device at
 102          * different locations, or in the MCHBAR.
 103          *
 104          * On 865 we just check the TOUD register.
 105          *
 106          * On 830/845/85x the stolen memory base isn't available in any
 107          * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
 108          *
 109          */
 110         base = 0;
 111         if (INTEL_INFO(dev)->gen >= 3) {
 112                 u32 bsm;
 113
 114                 pci_read_config_dword(dev->pdev, BSM, &bsm);
 115
 116                 base = bsm & BSM_MASK;
 117         } else if (IS_I865G(dev)) {
 118                 u16 toud = 0;
 119
 120                 /*
 121                  * FIXME is the graphics stolen memory region
 122                  * always at TOUD? Ie. is it always the last
 123                  * one to be allocated by the BIOS?
 124                  */
 125                 pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
 126                                          I865_TOUD, &toud);
 127
 128                 base = toud << 16;
 129         } else if (IS_I85X(dev)) {
 130                 u32 tseg_size = 0;
 131                 u32 tom;
 132                 u8 tmp;
 133
 134                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 135                                          I85X_ESMRAMC, &tmp);
 136
 137                 if (tmp & TSEG_ENABLE)
 138                         tseg_size = MB(1);
 139
 140                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1),
 141                                          I85X_DRB3, &tmp);
 142                 tom = tmp * MB(32);
 143
 144                 base = tom - tseg_size - ggtt->stolen_size;
 145         } else if (IS_845G(dev)) {
 146                 u32 tseg_size = 0;
 147                 u32 tom;
 148                 u8 tmp;
 149
 150                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 151                                          I845_ESMRAMC, &tmp);
 152
 153                 if (tmp & TSEG_ENABLE) {
 154                         switch (tmp & I845_TSEG_SIZE_MASK) {
 155                         case I845_TSEG_SIZE_512K:
 156                                 tseg_size = KB(512);
 157                                 break;
 158                         case I845_TSEG_SIZE_1M:
 159                                 tseg_size = MB(1);
 160                                 break;
 161                         }
 162                 }
 163
 164                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 165                                          I830_DRB3, &tmp);
 166                 tom = tmp * MB(32);
 167
 168                 base = tom - tseg_size - ggtt->stolen_size;
 169         } else if (IS_I830(dev)) {
 170                 u32 tseg_size = 0;
 171                 u32 tom;
 172                 u8 tmp;
 173
 174                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 175                                          I830_ESMRAMC, &tmp);
 176
 177                 if (tmp & TSEG_ENABLE) {
 178                         if (tmp & I830_TSEG_SIZE_1M)
 179                                 tseg_size = MB(1);
 180                         else
 181                                 tseg_size = KB(512);
 182                 }
 183
 184                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 185                                          I830_DRB3, &tmp);
 186                 tom = tmp * MB(32);
 187
 188                 base = tom - tseg_size - ggtt->stolen_size;
 189         }
 190
 191         if (base == 0)
 192                 return 0;
 193
 194         /* make sure we don't clobber the GTT if it's within stolen memory */
 195         if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
 196                 struct {
 197                         u32 start, end;
 198                 } stolen[2] = {
 199                         { .start = base, .end = base + ggtt->stolen_size, },
 200                         { .start = base, .end = base + ggtt->stolen_size, },
 201                 };
 202                 u64 ggtt_start, ggtt_end;
 203
 204                 ggtt_start = I915_READ(PGTBL_CTL);
 205                 if (IS_GEN4(dev))
 206                         ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
 207                                      (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
 208                 else
 209                         ggtt_start &= PGTBL_ADDRESS_LO_MASK;
 210                 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
 211
 212                 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
 213                         stolen[0].end = ggtt_start;
 214                 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
 215                         stolen[1].start = ggtt_end;
 216
 217                 /* pick the larger of the two chunks */
 218                 if (stolen[0].end - stolen[0].start >
 219                     stolen[1].end - stolen[1].start) {
 220                         base = stolen[0].start;
 221                         ggtt->stolen_size = stolen[0].end - stolen[0].start;
 222                 } else {
 223                         base = stolen[1].start;
 224                         ggtt->stolen_size = stolen[1].end - stolen[1].start;
 225                 }
 226
 227                 if (stolen[0].start != stolen[1].start ||
 228                     stolen[0].end != stolen[1].end) {
 229                         DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
 230                                       (unsigned long long)ggtt_start,
 231                                       (unsigned long long)ggtt_end - 1);
 232                         DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
 233                                       base, base + (u32)ggtt->stolen_size - 1);
 234                 }
 235         }
 236
 237
 238         /* Verify that nothing else uses this physical address. Stolen
 239          * memory should be reserved by the BIOS and hidden from the
 240          * kernel. So if the region is already marked as busy, something
 241          * is seriously wrong.
 242          */
 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
 268         return base;
 269 }
 270
 271 void i915_gem_cleanup_stolen(struct drm_device *dev)
 272 {
 273         struct drm_i915_private *dev_priv = dev->dev_private;
 274
 275         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 276                 return;
 277
 278         drm_mm_takedown(&dev_priv->mm.stolen);
 279 }
 280
 281 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 282                                     unsigned long *base, unsigned long *size)
 283 {
 284         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 285         uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 286                                      CTG_STOLEN_RESERVED :
 287                                      ELK_STOLEN_RESERVED);
 288         unsigned long stolen_top = dev_priv->mm.stolen_base +
 289                                    ggtt->stolen_size;
 290
 291         *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 292
 293         WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
 294
 295         /* On these platforms, the register doesn't have a size field, so the
 296          * size is the distance between the base and the top of the stolen
 297          * memory. We also have the genuine case where base is zero and there's
 298          * nothing reserved. */
 299         if (*base == 0)
 300                 *size = 0;
 301         else
 302                 *size = stolen_top - *base;
 303 }
 304
 305 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 306                                      unsigned long *base, unsigned long *size)
 307 {
 308         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 309
 310         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 311
 312         switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
 313         case GEN6_STOLEN_RESERVED_1M:
 314                 *size = 1024 * 1024;
 315                 break;
 316         case GEN6_STOLEN_RESERVED_512K:
 317                 *size = 512 * 1024;
 318                 break;
 319         case GEN6_STOLEN_RESERVED_256K:
 320                 *size = 256 * 1024;
 321                 break;
 322         case GEN6_STOLEN_RESERVED_128K:
 323                 *size = 128 * 1024;
 324                 break;
 325         default:
 326                 *size = 1024 * 1024;
 327                 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
 328         }
 329 }
 330
 331 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 332                                      unsigned long *base, unsigned long *size)
 333 {
 334         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 335
 336         *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
 337
 338         switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
 339         case GEN7_STOLEN_RESERVED_1M:
 340                 *size = 1024 * 1024;
 341                 break;
 342         case GEN7_STOLEN_RESERVED_256K:
 343                 *size = 256 * 1024;
 344                 break;
 345         default:
 346                 *size = 1024 * 1024;
 347                 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
 348         }
 349 }
 350
 351 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
 352                                      unsigned long *base, unsigned long *size)
 353 {
 354         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 355
 356         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 357
 358         switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
 359         case GEN8_STOLEN_RESERVED_1M:
 360                 *size = 1024 * 1024;
 361                 break;
 362         case GEN8_STOLEN_RESERVED_2M:
 363                 *size = 2 * 1024 * 1024;
 364                 break;
 365         case GEN8_STOLEN_RESERVED_4M:
 366                 *size = 4 * 1024 * 1024;
 367                 break;
 368         case GEN8_STOLEN_RESERVED_8M:
 369                 *size = 8 * 1024 * 1024;
 370                 break;
 371         default:
 372                 *size = 8 * 1024 * 1024;
 373                 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
 374         }
 375 }
 376
 377 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 378                                     unsigned long *base, unsigned long *size)
 379 {
 380         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 381         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 382         unsigned long stolen_top;
 383
 384         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 385
 386         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 387
 388         /* On these platforms, the register doesn't have a size field, so the
 389          * size is the distance between the base and the top of the stolen
 390          * memory. We also have the genuine case where base is zero and there's
 391          * nothing reserved. */
 392         if (*base == 0)
 393                 *size = 0;
 394         else
 395                 *size = stolen_top - *base;
 396 }
 397
 398 int i915_gem_init_stolen(struct drm_device *dev)
 399 {
 400         struct drm_i915_private *dev_priv = to_i915(dev);
 401         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 402         unsigned long reserved_total, reserved_base = 0, reserved_size;
 403         unsigned long stolen_top;
 404
 405         mutex_init(&dev_priv->mm.stolen_lock);
 406
 407 #ifdef CONFIG_INTEL_IOMMU
 408         if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
 409                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 410                 return 0;
 411         }
 412 #endif
 413
 414         if (ggtt->stolen_size == 0)
 415                 return 0;
 416
 417         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
 418         if (dev_priv->mm.stolen_base == 0)
 419                 return 0;
 420
 421         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 422
 423         switch (INTEL_INFO(dev_priv)->gen) {
 424         case 2:
 425         case 3:
 426                 break;
 427         case 4:
 428                 if (IS_G4X(dev))
 429                         g4x_get_stolen_reserved(dev_priv, &reserved_base,
 430                                                 &reserved_size);
 431                 break;
 432         case 5:
 433                 /* Assume the gen6 maximum for the older platforms. */
 434                 reserved_size = 1024 * 1024;
 435                 reserved_base = stolen_top - reserved_size;
 436                 break;
 437         case 6:
 438                 gen6_get_stolen_reserved(dev_priv, &reserved_base,
 439                                          &reserved_size);
 440                 break;
 441         case 7:
 442                 gen7_get_stolen_reserved(dev_priv, &reserved_base,
 443                                          &reserved_size);
 444                 break;
 445         default:
 446                 if (IS_BROADWELL(dev_priv) ||
 447                     IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev))
 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         ggtt->stolen_reserved_base = reserved_base;
 472         ggtt->stolen_reserved_size = reserved_size;
 473
 474         /* It is possible for the reserved area to end before the end of stolen
 475          * memory, so just consider the start. */
 476         reserved_total = stolen_top - reserved_base;
 477
 478         DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
 479                       ggtt->stolen_size >> 10,
 480                       (ggtt->stolen_size - reserved_total) >> 10);
 481
 482         ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total;
 483
 484         /*
 485          * Basic memrange allocator for stolen space.
 486          *
 487          * TODO: Notice that some platforms require us to not use the first page
 488          * of the stolen memory but their BIOSes may still put the framebuffer
 489          * on the first page. So we don't reserve this page for now because of
 490          * that. Our current solution is to just prevent new nodes from being
 491          * inserted on the first page - see the check we have at
 492          * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
 493          * problem later.
 494          */
 495         drm_mm_init(&dev_priv->mm.stolen, 0, 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 i915_ggtt *ggtt = &dev_priv->ggtt;
 506         struct sg_table *st;
 507         struct scatterlist *sg;
 508
 509         DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
 510         BUG_ON(offset > ggtt->stolen_size - size);
 511
 512         /* We hide that we have no struct page backing our stolen object
 513          * by wrapping the contiguous physical allocation with a fake
 514          * dma mapping in a single scatterlist.
 515          */
 516
 517         st = kmalloc(sizeof(*st), GFP_KERNEL);
 518         if (st == NULL)
 519                 return NULL;
 520
 521         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 522                 kfree(st);
 523                 return NULL;
 524         }
 525
 526         sg = st->sgl;
 527         sg->offset = 0;
 528         sg->length = size;
 529
 530         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 531         sg_dma_len(sg) = size;
 532
 533         return st;
 534 }
 535
 536 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 537 {
 538         BUG();
 539         return -EINVAL;
 540 }
 541
 542 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
 543 {
 544         /* Should only be called during free */
 545         sg_free_table(obj->pages);
 546         kfree(obj->pages);
 547 }
 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 = obj->base.dev->dev_private;
 554
 555         if (obj->stolen) {
 556                 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
 557                 kfree(obj->stolen);
 558                 obj->stolen = NULL;
 559         }
 560 }
 561 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 562         .get_pages = i915_gem_object_get_pages_stolen,
 563         .put_pages = i915_gem_object_put_pages_stolen,
 564         .release = i915_gem_object_release_stolen,
 565 };
 566
 567 static struct drm_i915_gem_object *
 568 _i915_gem_object_create_stolen(struct drm_device *dev,
 569                                struct drm_mm_node *stolen)
 570 {
 571         struct drm_i915_gem_object *obj;
 572
 573         obj = i915_gem_object_alloc(dev);
 574         if (obj == NULL)
 575                 return NULL;
 576
 577         drm_gem_private_object_init(dev, &obj->base, stolen->size);
 578         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 579
 580         obj->pages = i915_pages_create_for_stolen(dev,
 581                                                   stolen->start, stolen->size);
 582         if (obj->pages == NULL)
 583                 goto cleanup;
 584
 585         obj->get_page.sg = obj->pages->sgl;
 586         obj->get_page.last = 0;
 587
 588         i915_gem_object_pin_pages(obj);
 589         obj->stolen = stolen;
 590
 591         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 592         obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
 593
 594         return obj;
 595
 596 cleanup:
 597         i915_gem_object_free(obj);
 598         return NULL;
 599 }
 600
 601 struct drm_i915_gem_object *
 602 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
 603 {
 604         struct drm_i915_private *dev_priv = dev->dev_private;
 605         struct drm_i915_gem_object *obj;
 606         struct drm_mm_node *stolen;
 607         int ret;
 608
 609         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 610                 return NULL;
 611
 612         DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
 613         if (size == 0)
 614                 return NULL;
 615
 616         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 617         if (!stolen)
 618                 return NULL;
 619
 620         ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
 621         if (ret) {
 622                 kfree(stolen);
 623                 return NULL;
 624         }
 625
 626         obj = _i915_gem_object_create_stolen(dev, stolen);
 627         if (obj)
 628                 return obj;
 629
 630         i915_gem_stolen_remove_node(dev_priv, stolen);
 631         kfree(stolen);
 632         return NULL;
 633 }
 634
 635 struct drm_i915_gem_object *
 636 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 637                                                u32 stolen_offset,
 638                                                u32 gtt_offset,
 639                                                u32 size)
 640 {
 641         struct drm_i915_private *dev_priv = to_i915(dev);
 642         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 643         struct drm_i915_gem_object *obj;
 644         struct drm_mm_node *stolen;
 645         struct i915_vma *vma;
 646         int ret;
 647
 648         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 649                 return NULL;
 650
 651         lockdep_assert_held(&dev->struct_mutex);
 652
 653         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 654                         stolen_offset, gtt_offset, size);
 655
 656         /* KISS and expect everything to be page-aligned */
 657         if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
 658             WARN_ON(stolen_offset & 4095))
 659                 return NULL;
 660
 661         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 662         if (!stolen)
 663                 return NULL;
 664
 665         stolen->start = stolen_offset;
 666         stolen->size = size;
 667         mutex_lock(&dev_priv->mm.stolen_lock);
 668         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 669         mutex_unlock(&dev_priv->mm.stolen_lock);
 670         if (ret) {
 671                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 672                 kfree(stolen);
 673                 return NULL;
 674         }
 675
 676         obj = _i915_gem_object_create_stolen(dev, stolen);
 677         if (obj == NULL) {
 678                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 679                 i915_gem_stolen_remove_node(dev_priv, stolen);
 680                 kfree(stolen);
 681                 return NULL;
 682         }
 683
 684         /* Some objects just need physical mem from stolen space */
 685         if (gtt_offset == I915_GTT_OFFSET_NONE)
 686                 return obj;
 687
 688         vma = i915_gem_obj_lookup_or_create_vma(obj, &ggtt->base);
 689         if (IS_ERR(vma)) {
 690                 ret = PTR_ERR(vma);
 691                 goto err;
 692         }
 693
 694         /* To simplify the initialisation sequence between KMS and GTT,
 695          * we allow construction of the stolen object prior to
 696          * setting up the GTT space. The actual reservation will occur
 697          * later.
 698          */
 699         vma->node.start = gtt_offset;
 700         vma->node.size = size;
 701         if (drm_mm_initialized(&ggtt->base.mm)) {
 702                 ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node);
 703                 if (ret) {
 704                         DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 705                         goto err;
 706                 }
 707
 708                 vma->bound |= GLOBAL_BIND;
 709                 __i915_vma_set_map_and_fenceable(vma);
 710                 list_add_tail(&vma->vm_link, &ggtt->base.inactive_list);
 711         }
 712
 713         list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
 714         i915_gem_object_pin_pages(obj);
 715
 716         return obj;
 717
 718 err:
 719         drm_gem_object_unreference(&obj->base);
 720         return NULL;
 721 }