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,
  59                                           size, alignment, 0,
  60                                           start, end, DRM_MM_INSERT_BEST);
  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 dma_addr_t i915_stolen_to_dma(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         dma_addr_t 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 || add_overflows(base, ggtt->stolen_size))
 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                         dma_addr_t 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                         dma_addr_t end = base + ggtt->stolen_size - 1;
 232
 233                         DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
 234                                       (unsigned long long)ggtt_start,
 235                                       (unsigned long long)ggtt_end - 1);
 236                         DRM_DEBUG_KMS("Stolen memory adjusted to %pad - %pad\n",
 237                                       &base, &end);
 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_priv->drm.dev, base, ggtt->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_priv->drm.dev, base + 1,
 259                                             ggtt->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_priv)) {
 266                         dma_addr_t end = base + ggtt->stolen_size;
 267
 268                         DRM_ERROR("conflict detected with stolen region: [%pad - %pad]\n",
 269                                   &base, &end);
 270                         base = 0;
 271                 }
 272         }
 273
 274         return base;
 275 }
 276
 277 void i915_gem_cleanup_stolen(struct drm_device *dev)
 278 {
 279         struct drm_i915_private *dev_priv = to_i915(dev);
 280
 281         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 282                 return;
 283
 284         drm_mm_takedown(&dev_priv->mm.stolen);
 285 }
 286
 287 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 288                                     dma_addr_t *base, u32 *size)
 289 {
 290         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 291         uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 292                                      CTG_STOLEN_RESERVED :
 293                                      ELK_STOLEN_RESERVED);
 294         dma_addr_t stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 295
 296         *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 297
 298         WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
 299
 300         /* On these platforms, the register doesn't have a size field, so the
 301          * size is the distance between the base and the top of the stolen
 302          * memory. We also have the genuine case where base is zero and there's
 303          * nothing reserved. */
 304         if (*base == 0)
 305                 *size = 0;
 306         else
 307                 *size = stolen_top - *base;
 308 }
 309
 310 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 311                                      dma_addr_t *base, u32 *size)
 312 {
 313         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 314
 315         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 316
 317         switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
 318         case GEN6_STOLEN_RESERVED_1M:
 319                 *size = 1024 * 1024;
 320                 break;
 321         case GEN6_STOLEN_RESERVED_512K:
 322                 *size = 512 * 1024;
 323                 break;
 324         case GEN6_STOLEN_RESERVED_256K:
 325                 *size = 256 * 1024;
 326                 break;
 327         case GEN6_STOLEN_RESERVED_128K:
 328                 *size = 128 * 1024;
 329                 break;
 330         default:
 331                 *size = 1024 * 1024;
 332                 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
 333         }
 334 }
 335
 336 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 337                                      dma_addr_t *base, u32 *size)
 338 {
 339         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 340
 341         *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
 342
 343         switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
 344         case GEN7_STOLEN_RESERVED_1M:
 345                 *size = 1024 * 1024;
 346                 break;
 347         case GEN7_STOLEN_RESERVED_256K:
 348                 *size = 256 * 1024;
 349                 break;
 350         default:
 351                 *size = 1024 * 1024;
 352                 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
 353         }
 354 }
 355
 356 static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
 357                                     dma_addr_t *base, u32 *size)
 358 {
 359         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 360
 361         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 362
 363         switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
 364         case GEN8_STOLEN_RESERVED_1M:
 365                 *size = 1024 * 1024;
 366                 break;
 367         case GEN8_STOLEN_RESERVED_2M:
 368                 *size = 2 * 1024 * 1024;
 369                 break;
 370         case GEN8_STOLEN_RESERVED_4M:
 371                 *size = 4 * 1024 * 1024;
 372                 break;
 373         case GEN8_STOLEN_RESERVED_8M:
 374                 *size = 8 * 1024 * 1024;
 375                 break;
 376         default:
 377                 *size = 8 * 1024 * 1024;
 378                 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
 379         }
 380 }
 381
 382 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 383                                     dma_addr_t *base, u32 *size)
 384 {
 385         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 386         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 387         dma_addr_t stolen_top;
 388
 389         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 390
 391         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 392
 393         /* On these platforms, the register doesn't have a size field, so the
 394          * size is the distance between the base and the top of the stolen
 395          * memory. We also have the genuine case where base is zero and there's
 396          * nothing reserved. */
 397         if (*base == 0)
 398                 *size = 0;
 399         else
 400                 *size = stolen_top - *base;
 401 }
 402
 403 int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 404 {
 405         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 406         dma_addr_t reserved_base, stolen_top;
 407         u32 reserved_total, reserved_size;
 408         u32 stolen_usable_start;
 409
 410         mutex_init(&dev_priv->mm.stolen_lock);
 411
 412         if (intel_vgpu_active(dev_priv)) {
 413                 DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
 414                 return 0;
 415         }
 416
 417 #ifdef CONFIG_INTEL_IOMMU
 418         if (intel_iommu_gfx_mapped && INTEL_GEN(dev_priv) < 8) {
 419                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 420                 return 0;
 421         }
 422 #endif
 423
 424         if (ggtt->stolen_size == 0)
 425                 return 0;
 426
 427         dev_priv->mm.stolen_base = i915_stolen_to_dma(dev_priv);
 428         if (dev_priv->mm.stolen_base == 0)
 429                 return 0;
 430
 431         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 432         reserved_base = 0;
 433         reserved_size = 0;
 434
 435         switch (INTEL_INFO(dev_priv)->gen) {
 436         case 2:
 437         case 3:
 438                 break;
 439         case 4:
 440                 if (IS_G4X(dev_priv))
 441                         g4x_get_stolen_reserved(dev_priv,
 442                                                 &reserved_base, &reserved_size);
 443                 break;
 444         case 5:
 445                 /* Assume the gen6 maximum for the older platforms. */
 446                 reserved_size = 1024 * 1024;
 447                 reserved_base = stolen_top - reserved_size;
 448                 break;
 449         case 6:
 450                 gen6_get_stolen_reserved(dev_priv,
 451                                          &reserved_base, &reserved_size);
 452                 break;
 453         case 7:
 454                 gen7_get_stolen_reserved(dev_priv,
 455                                          &reserved_base, &reserved_size);
 456                 break;
 457         default:
 458                 if (IS_LP(dev_priv))
 459                         chv_get_stolen_reserved(dev_priv,
 460                                                 &reserved_base, &reserved_size);
 461                 else
 462                         bdw_get_stolen_reserved(dev_priv,
 463                                                 &reserved_base, &reserved_size);
 464                 break;
 465         }
 466
 467         /* It is possible for the reserved base to be zero, but the register
 468          * field for size doesn't have a zero option. */
 469         if (reserved_base == 0) {
 470                 reserved_size = 0;
 471                 reserved_base = stolen_top;
 472         }
 473
 474         if (reserved_base < dev_priv->mm.stolen_base ||
 475             reserved_base + reserved_size > stolen_top) {
 476                 dma_addr_t reserved_top = reserved_base + reserved_size;
 477                 DRM_DEBUG_KMS("Stolen reserved area [%pad - %pad] outside stolen memory [%pad - %pad]\n",
 478                               &reserved_base, &reserved_top,
 479                               &dev_priv->mm.stolen_base, &stolen_top);
 480                 return 0;
 481         }
 482
 483         ggtt->stolen_reserved_base = reserved_base;
 484         ggtt->stolen_reserved_size = reserved_size;
 485
 486         /* It is possible for the reserved area to end before the end of stolen
 487          * memory, so just consider the start. */
 488         reserved_total = stolen_top - reserved_base;
 489
 490         DRM_DEBUG_KMS("Memory reserved for graphics device: %uK, usable: %uK\n",
 491                       ggtt->stolen_size >> 10,
 492                       (ggtt->stolen_size - reserved_total) >> 10);
 493
 494         stolen_usable_start = 0;
 495         /* WaSkipStolenMemoryFirstPage:bdw+ */
 496         if (INTEL_GEN(dev_priv) >= 8)
 497                 stolen_usable_start = 4096;
 498
 499         ggtt->stolen_usable_size =
 500                 ggtt->stolen_size - reserved_total - stolen_usable_start;
 501
 502         /* Basic memrange allocator for stolen space. */
 503         drm_mm_init(&dev_priv->mm.stolen, stolen_usable_start,
 504                     ggtt->stolen_usable_size);
 505
 506         return 0;
 507 }
 508
 509 static struct sg_table *
 510 i915_pages_create_for_stolen(struct drm_device *dev,
 511                              u32 offset, u32 size)
 512 {
 513         struct drm_i915_private *dev_priv = to_i915(dev);
 514         struct sg_table *st;
 515         struct scatterlist *sg;
 516
 517         GEM_BUG_ON(range_overflows(offset, size, dev_priv->ggtt.stolen_size));
 518
 519         /* We hide that we have no struct page backing our stolen object
 520          * by wrapping the contiguous physical allocation with a fake
 521          * dma mapping in a single scatterlist.
 522          */
 523
 524         st = kmalloc(sizeof(*st), GFP_KERNEL);
 525         if (st == NULL)
 526                 return ERR_PTR(-ENOMEM);
 527
 528         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 529                 kfree(st);
 530                 return ERR_PTR(-ENOMEM);
 531         }
 532
 533         sg = st->sgl;
 534         sg->offset = 0;
 535         sg->length = size;
 536
 537         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 538         sg_dma_len(sg) = size;
 539
 540         return st;
 541 }
 542
 543 static struct sg_table *
 544 i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 545 {
 546         return i915_pages_create_for_stolen(obj->base.dev,
 547                                             obj->stolen->start,
 548                                             obj->stolen->size);
 549 }
 550
 551 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
 552                                              struct sg_table *pages)
 553 {
 554         /* Should only be called from i915_gem_object_release_stolen() */
 555         sg_free_table(pages);
 556         kfree(pages);
 557 }
 558
 559 static void
 560 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 561 {
 562         struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
 563         struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
 564
 565         GEM_BUG_ON(!stolen);
 566
 567         __i915_gem_object_unpin_pages(obj);
 568
 569         i915_gem_stolen_remove_node(dev_priv, stolen);
 570         kfree(stolen);
 571 }
 572
 573 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 574         .get_pages = i915_gem_object_get_pages_stolen,
 575         .put_pages = i915_gem_object_put_pages_stolen,
 576         .release = i915_gem_object_release_stolen,
 577 };
 578
 579 static struct drm_i915_gem_object *
 580 _i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
 581                                struct drm_mm_node *stolen)
 582 {
 583         struct drm_i915_gem_object *obj;
 584
 585         obj = i915_gem_object_alloc(dev_priv);
 586         if (obj == NULL)
 587                 return NULL;
 588
 589         drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size);
 590         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 591
 592         obj->stolen = stolen;
 593         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 594         obj->cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE;
 595
 596         if (i915_gem_object_pin_pages(obj))
 597                 goto cleanup;
 598
 599         return obj;
 600
 601 cleanup:
 602         i915_gem_object_free(obj);
 603         return NULL;
 604 }
 605
 606 struct drm_i915_gem_object *
 607 i915_gem_object_create_stolen(struct drm_i915_private *dev_priv, u32 size)
 608 {
 609         struct drm_i915_gem_object *obj;
 610         struct drm_mm_node *stolen;
 611         int ret;
 612
 613         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 614                 return NULL;
 615
 616         if (size == 0)
 617                 return NULL;
 618
 619         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 620         if (!stolen)
 621                 return NULL;
 622
 623         ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
 624         if (ret) {
 625                 kfree(stolen);
 626                 return NULL;
 627         }
 628
 629         obj = _i915_gem_object_create_stolen(dev_priv, stolen);
 630         if (obj)
 631                 return obj;
 632
 633         i915_gem_stolen_remove_node(dev_priv, stolen);
 634         kfree(stolen);
 635         return NULL;
 636 }
 637
 638 struct drm_i915_gem_object *
 639 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv,
 640                                                u32 stolen_offset,
 641                                                u32 gtt_offset,
 642                                                u32 size)
 643 {
 644         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 645         struct drm_i915_gem_object *obj;
 646         struct drm_mm_node *stolen;
 647         struct i915_vma *vma;
 648         int ret;
 649
 650         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 651                 return NULL;
 652
 653         lockdep_assert_held(&dev_priv->drm.struct_mutex);
 654
 655         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 656                         stolen_offset, gtt_offset, size);
 657
 658         /* KISS and expect everything to be page-aligned */
 659         if (WARN_ON(size == 0) ||
 660             WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
 661             WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
 662                 return NULL;
 663
 664         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 665         if (!stolen)
 666                 return NULL;
 667
 668         stolen->start = stolen_offset;
 669         stolen->size = size;
 670         mutex_lock(&dev_priv->mm.stolen_lock);
 671         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 672         mutex_unlock(&dev_priv->mm.stolen_lock);
 673         if (ret) {
 674                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 675                 kfree(stolen);
 676                 return NULL;
 677         }
 678
 679         obj = _i915_gem_object_create_stolen(dev_priv, stolen);
 680         if (obj == NULL) {
 681                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 682                 i915_gem_stolen_remove_node(dev_priv, stolen);
 683                 kfree(stolen);
 684                 return NULL;
 685         }
 686
 687         /* Some objects just need physical mem from stolen space */
 688         if (gtt_offset == I915_GTT_OFFSET_NONE)
 689                 return obj;
 690
 691         ret = i915_gem_object_pin_pages(obj);
 692         if (ret)
 693                 goto err;
 694
 695         vma = i915_vma_instance(obj, &ggtt->base, NULL);
 696         if (IS_ERR(vma)) {
 697                 ret = PTR_ERR(vma);
 698                 goto err_pages;
 699         }
 700
 701         /* To simplify the initialisation sequence between KMS and GTT,
 702          * we allow construction of the stolen object prior to
 703          * setting up the GTT space. The actual reservation will occur
 704          * later.
 705          */
 706         ret = i915_gem_gtt_reserve(&ggtt->base, &vma->node,
 707                                    size, gtt_offset, obj->cache_level,
 708                                    0);
 709         if (ret) {
 710                 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 711                 goto err_pages;
 712         }
 713
 714         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 715
 716         vma->pages = obj->mm.pages;
 717         vma->flags |= I915_VMA_GLOBAL_BIND;
 718         __i915_vma_set_map_and_fenceable(vma);
 719         list_move_tail(&vma->vm_link, &ggtt->base.inactive_list);
 720         list_move_tail(&obj->global_link, &dev_priv->mm.bound_list);
 721         obj->bind_count++;
 722
 723         return obj;
 724
 725 err_pages:
 726         i915_gem_object_unpin_pages(obj);
 727 err:
 728         i915_gem_object_put(obj);
 729         return NULL;
 730 }