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 unsigned long i915_stolen_to_physical(struct drm_i915_private *dev_priv)
  83 {
  84         struct pci_dev *pdev = dev_priv->drm.pdev;
  85         struct i915_ggtt *ggtt = &dev_priv->ggtt;
  86         struct resource *r;
  87         u32 base;
  88
  89         /* Almost universally we can find the Graphics Base of Stolen Memory
  90          * at register BSM (0x5c) in the igfx configuration space. On a few
  91          * (desktop) machines this is also mirrored in the bridge device at
  92          * different locations, or in the MCHBAR.
  93          *
  94          * On 865 we just check the TOUD register.
  95          *
  96          * On 830/845/85x the stolen memory base isn't available in any
  97          * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
  98          *
  99          */
 100         base = 0;
 101         if (INTEL_GEN(dev_priv) >= 3) {
 102                 u32 bsm;
 103
 104                 pci_read_config_dword(pdev, INTEL_BSM, &bsm);
 105
 106                 base = bsm & INTEL_BSM_MASK;
 107         } else if (IS_I865G(dev_priv)) {
 108                 u32 tseg_size = 0;
 109                 u16 toud = 0;
 110                 u8 tmp;
 111
 112                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 113                                          I845_ESMRAMC, &tmp);
 114
 115                 if (tmp & TSEG_ENABLE) {
 116                         switch (tmp & I845_TSEG_SIZE_MASK) {
 117                         case I845_TSEG_SIZE_512K:
 118                                 tseg_size = KB(512);
 119                                 break;
 120                         case I845_TSEG_SIZE_1M:
 121                                 tseg_size = MB(1);
 122                                 break;
 123                         }
 124                 }
 125
 126                 pci_bus_read_config_word(pdev->bus, PCI_DEVFN(0, 0),
 127                                          I865_TOUD, &toud);
 128
 129                 base = (toud << 16) + tseg_size;
 130         } else if (IS_I85X(dev_priv)) {
 131                 u32 tseg_size = 0;
 132                 u32 tom;
 133                 u8 tmp;
 134
 135                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 136                                          I85X_ESMRAMC, &tmp);
 137
 138                 if (tmp & TSEG_ENABLE)
 139                         tseg_size = MB(1);
 140
 141                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 1),
 142                                          I85X_DRB3, &tmp);
 143                 tom = tmp * MB(32);
 144
 145                 base = tom - tseg_size - ggtt->stolen_size;
 146         } else if (IS_I845G(dev_priv)) {
 147                 u32 tseg_size = 0;
 148                 u32 tom;
 149                 u8 tmp;
 150
 151                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 152                                          I845_ESMRAMC, &tmp);
 153
 154                 if (tmp & TSEG_ENABLE) {
 155                         switch (tmp & I845_TSEG_SIZE_MASK) {
 156                         case I845_TSEG_SIZE_512K:
 157                                 tseg_size = KB(512);
 158                                 break;
 159                         case I845_TSEG_SIZE_1M:
 160                                 tseg_size = MB(1);
 161                                 break;
 162                         }
 163                 }
 164
 165                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 166                                          I830_DRB3, &tmp);
 167                 tom = tmp * MB(32);
 168
 169                 base = tom - tseg_size - ggtt->stolen_size;
 170         } else if (IS_I830(dev_priv)) {
 171                 u32 tseg_size = 0;
 172                 u32 tom;
 173                 u8 tmp;
 174
 175                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 176                                          I830_ESMRAMC, &tmp);
 177
 178                 if (tmp & TSEG_ENABLE) {
 179                         if (tmp & I830_TSEG_SIZE_1M)
 180                                 tseg_size = MB(1);
 181                         else
 182                                 tseg_size = KB(512);
 183                 }
 184
 185                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 186                                          I830_DRB3, &tmp);
 187                 tom = tmp * MB(32);
 188
 189                 base = tom - tseg_size - ggtt->stolen_size;
 190         }
 191
 192         if (base == 0)
 193                 return 0;
 194
 195         /* make sure we don't clobber the GTT if it's within stolen memory */
 196         if (INTEL_GEN(dev_priv) <= 4 &&
 197             !IS_G33(dev_priv) && !IS_PINEVIEW(dev_priv) && !IS_G4X(dev_priv)) {
 198                 struct {
 199                         u32 start, end;
 200                 } stolen[2] = {
 201                         { .start = base, .end = base + ggtt->stolen_size, },
 202                         { .start = base, .end = base + ggtt->stolen_size, },
 203                 };
 204                 u64 ggtt_start, ggtt_end;
 205
 206                 ggtt_start = I915_READ(PGTBL_CTL);
 207                 if (IS_GEN4(dev_priv))
 208                         ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
 209                                      (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
 210                 else
 211                         ggtt_start &= PGTBL_ADDRESS_LO_MASK;
 212                 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
 213
 214                 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
 215                         stolen[0].end = ggtt_start;
 216                 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
 217                         stolen[1].start = ggtt_end;
 218
 219                 /* pick the larger of the two chunks */
 220                 if (stolen[0].end - stolen[0].start >
 221                     stolen[1].end - stolen[1].start) {
 222                         base = stolen[0].start;
 223                         ggtt->stolen_size = stolen[0].end - stolen[0].start;
 224                 } else {
 225                         base = stolen[1].start;
 226                         ggtt->stolen_size = stolen[1].end - stolen[1].start;
 227                 }
 228
 229                 if (stolen[0].start != stolen[1].start ||
 230                     stolen[0].end != stolen[1].end) {
 231                         DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
 232                                       (unsigned long long)ggtt_start,
 233                                       (unsigned long long)ggtt_end - 1);
 234                         DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
 235                                       base, base + (u32)ggtt->stolen_size - 1);
 236                 }
 237         }
 238
 239
 240         /* Verify that nothing else uses this physical address. Stolen
 241          * memory should be reserved by the BIOS and hidden from the
 242          * kernel. So if the region is already marked as busy, something
 243          * is seriously wrong.
 244          */
 245         r = devm_request_mem_region(dev_priv->drm.dev, base, ggtt->stolen_size,
 246                                     "Graphics Stolen Memory");
 247         if (r == NULL) {
 248                 /*
 249                  * One more attempt but this time requesting region from
 250                  * base + 1, as we have seen that this resolves the region
 251                  * conflict with the PCI Bus.
 252                  * This is a BIOS w/a: Some BIOS wrap stolen in the root
 253                  * PCI bus, but have an off-by-one error. Hence retry the
 254                  * reservation starting from 1 instead of 0.
 255                  */
 256                 r = devm_request_mem_region(dev_priv->drm.dev, base + 1,
 257                                             ggtt->stolen_size - 1,
 258                                             "Graphics Stolen Memory");
 259                 /*
 260                  * GEN3 firmware likes to smash pci bridges into the stolen
 261                  * range. Apparently this works.
 262                  */
 263                 if (r == NULL && !IS_GEN3(dev_priv)) {
 264                         DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
 265                                   base, base + (uint32_t)ggtt->stolen_size);
 266                         base = 0;
 267                 }
 268         }
 269
 270         return base;
 271 }
 272
 273 void i915_gem_cleanup_stolen(struct drm_device *dev)
 274 {
 275         struct drm_i915_private *dev_priv = to_i915(dev);
 276
 277         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 278                 return;
 279
 280         drm_mm_takedown(&dev_priv->mm.stolen);
 281 }
 282
 283 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 284                                     phys_addr_t *base, u32 *size)
 285 {
 286         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 287         uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 288                                      CTG_STOLEN_RESERVED :
 289                                      ELK_STOLEN_RESERVED);
 290         phys_addr_t stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 291
 292         *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 293
 294         WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
 295
 296         /* On these platforms, the register doesn't have a size field, so the
 297          * size is the distance between the base and the top of the stolen
 298          * memory. We also have the genuine case where base is zero and there's
 299          * nothing reserved. */
 300         if (*base == 0)
 301                 *size = 0;
 302         else
 303                 *size = stolen_top - *base;
 304 }
 305
 306 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 307                                      phys_addr_t *base, u32 *size)
 308 {
 309         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 310
 311         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 312
 313         switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
 314         case GEN6_STOLEN_RESERVED_1M:
 315                 *size = 1024 * 1024;
 316                 break;
 317         case GEN6_STOLEN_RESERVED_512K:
 318                 *size = 512 * 1024;
 319                 break;
 320         case GEN6_STOLEN_RESERVED_256K:
 321                 *size = 256 * 1024;
 322                 break;
 323         case GEN6_STOLEN_RESERVED_128K:
 324                 *size = 128 * 1024;
 325                 break;
 326         default:
 327                 *size = 1024 * 1024;
 328                 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
 329         }
 330 }
 331
 332 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 333                                      phys_addr_t *base, u32 *size)
 334 {
 335         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 336
 337         *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
 338
 339         switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
 340         case GEN7_STOLEN_RESERVED_1M:
 341                 *size = 1024 * 1024;
 342                 break;
 343         case GEN7_STOLEN_RESERVED_256K:
 344                 *size = 256 * 1024;
 345                 break;
 346         default:
 347                 *size = 1024 * 1024;
 348                 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
 349         }
 350 }
 351
 352 static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
 353                                     phys_addr_t *base, u32 *size)
 354 {
 355         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 356
 357         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 358
 359         switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
 360         case GEN8_STOLEN_RESERVED_1M:
 361                 *size = 1024 * 1024;
 362                 break;
 363         case GEN8_STOLEN_RESERVED_2M:
 364                 *size = 2 * 1024 * 1024;
 365                 break;
 366         case GEN8_STOLEN_RESERVED_4M:
 367                 *size = 4 * 1024 * 1024;
 368                 break;
 369         case GEN8_STOLEN_RESERVED_8M:
 370                 *size = 8 * 1024 * 1024;
 371                 break;
 372         default:
 373                 *size = 8 * 1024 * 1024;
 374                 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
 375         }
 376 }
 377
 378 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 379                                     phys_addr_t *base, u32 *size)
 380 {
 381         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 382         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 383         phys_addr_t stolen_top;
 384
 385         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 386
 387         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 388
 389         /* On these platforms, the register doesn't have a size field, so the
 390          * size is the distance between the base and the top of the stolen
 391          * memory. We also have the genuine case where base is zero and there's
 392          * nothing reserved. */
 393         if (*base == 0)
 394                 *size = 0;
 395         else
 396                 *size = stolen_top - *base;
 397 }
 398
 399 int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 400 {
 401         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 402         phys_addr_t reserved_base, stolen_top;
 403         u32 reserved_total, reserved_size;
 404         u32 stolen_usable_start;
 405
 406         mutex_init(&dev_priv->mm.stolen_lock);
 407
 408         if (intel_vgpu_active(dev_priv)) {
 409                 DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
 410                 return 0;
 411         }
 412
 413 #ifdef CONFIG_INTEL_IOMMU
 414         if (intel_iommu_gfx_mapped && INTEL_GEN(dev_priv) < 8) {
 415                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 416                 return 0;
 417         }
 418 #endif
 419
 420         if (ggtt->stolen_size == 0)
 421                 return 0;
 422
 423         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev_priv);
 424         if (dev_priv->mm.stolen_base == 0)
 425                 return 0;
 426
 427         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 428         reserved_base = 0;
 429         reserved_size = 0;
 430
 431         switch (INTEL_INFO(dev_priv)->gen) {
 432         case 2:
 433         case 3:
 434                 break;
 435         case 4:
 436                 if (IS_G4X(dev_priv))
 437                         g4x_get_stolen_reserved(dev_priv,
 438                                                 &reserved_base, &reserved_size);
 439                 break;
 440         case 5:
 441                 /* Assume the gen6 maximum for the older platforms. */
 442                 reserved_size = 1024 * 1024;
 443                 reserved_base = stolen_top - reserved_size;
 444                 break;
 445         case 6:
 446                 gen6_get_stolen_reserved(dev_priv,
 447                                          &reserved_base, &reserved_size);
 448                 break;
 449         case 7:
 450                 gen7_get_stolen_reserved(dev_priv,
 451                                          &reserved_base, &reserved_size);
 452                 break;
 453         default:
 454                 if (IS_LP(dev_priv))
 455                         chv_get_stolen_reserved(dev_priv,
 456                                                 &reserved_base, &reserved_size);
 457                 else
 458                         bdw_get_stolen_reserved(dev_priv,
 459                                                 &reserved_base, &reserved_size);
 460                 break;
 461         }
 462
 463         /* It is possible for the reserved base to be zero, but the register
 464          * field for size doesn't have a zero option. */
 465         if (reserved_base == 0) {
 466                 reserved_size = 0;
 467                 reserved_base = stolen_top;
 468         }
 469
 470         if (reserved_base < dev_priv->mm.stolen_base ||
 471             reserved_base + reserved_size > stolen_top) {
 472                 phys_addr_t reserved_top = reserved_base + reserved_size;
 473                 DRM_DEBUG_KMS("Stolen reserved area [%pa - %pa] outside stolen memory [%pa - %pa]\n",
 474                               &reserved_base, &reserved_top,
 475                               &dev_priv->mm.stolen_base, &stolen_top);
 476                 return 0;
 477         }
 478
 479         ggtt->stolen_reserved_base = reserved_base;
 480         ggtt->stolen_reserved_size = reserved_size;
 481
 482         /* It is possible for the reserved area to end before the end of stolen
 483          * memory, so just consider the start. */
 484         reserved_total = stolen_top - reserved_base;
 485
 486         DRM_DEBUG_KMS("Memory reserved for graphics device: %uK, usable: %uK\n",
 487                       ggtt->stolen_size >> 10,
 488                       (ggtt->stolen_size - reserved_total) >> 10);
 489
 490         stolen_usable_start = 0;
 491         /* WaSkipStolenMemoryFirstPage:bdw+ */
 492         if (INTEL_GEN(dev_priv) >= 8)
 493                 stolen_usable_start = 4096;
 494
 495         ggtt->stolen_usable_size =
 496                 ggtt->stolen_size - reserved_total - stolen_usable_start;
 497
 498         /* Basic memrange allocator for stolen space. */
 499         drm_mm_init(&dev_priv->mm.stolen, stolen_usable_start,
 500                     ggtt->stolen_usable_size);
 501
 502         return 0;
 503 }
 504
 505 static struct sg_table *
 506 i915_pages_create_for_stolen(struct drm_device *dev,
 507                              u32 offset, u32 size)
 508 {
 509         struct drm_i915_private *dev_priv = to_i915(dev);
 510         struct sg_table *st;
 511         struct scatterlist *sg;
 512
 513         GEM_BUG_ON(range_overflows(offset, size, dev_priv->ggtt.stolen_size));
 514
 515         /* We hide that we have no struct page backing our stolen object
 516          * by wrapping the contiguous physical allocation with a fake
 517          * dma mapping in a single scatterlist.
 518          */
 519
 520         st = kmalloc(sizeof(*st), GFP_KERNEL);
 521         if (st == NULL)
 522                 return ERR_PTR(-ENOMEM);
 523
 524         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 525                 kfree(st);
 526                 return ERR_PTR(-ENOMEM);
 527         }
 528
 529         sg = st->sgl;
 530         sg->offset = 0;
 531         sg->length = size;
 532
 533         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 534         sg_dma_len(sg) = size;
 535
 536         return st;
 537 }
 538
 539 static struct sg_table *
 540 i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 541 {
 542         return i915_pages_create_for_stolen(obj->base.dev,
 543                                             obj->stolen->start,
 544                                             obj->stolen->size);
 545 }
 546
 547 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
 548                                              struct sg_table *pages)
 549 {
 550         /* Should only be called from i915_gem_object_release_stolen() */
 551         sg_free_table(pages);
 552         kfree(pages);
 553 }
 554
 555 static void
 556 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 557 {
 558         struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
 559         struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
 560
 561         GEM_BUG_ON(!stolen);
 562
 563         __i915_gem_object_unpin_pages(obj);
 564
 565         i915_gem_stolen_remove_node(dev_priv, stolen);
 566         kfree(stolen);
 567 }
 568
 569 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 570         .get_pages = i915_gem_object_get_pages_stolen,
 571         .put_pages = i915_gem_object_put_pages_stolen,
 572         .release = i915_gem_object_release_stolen,
 573 };
 574
 575 static struct drm_i915_gem_object *
 576 _i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
 577                                struct drm_mm_node *stolen)
 578 {
 579         struct drm_i915_gem_object *obj;
 580
 581         obj = i915_gem_object_alloc(dev_priv);
 582         if (obj == NULL)
 583                 return NULL;
 584
 585         drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size);
 586         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 587
 588         obj->stolen = stolen;
 589         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 590         obj->cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE;
 591
 592         if (i915_gem_object_pin_pages(obj))
 593                 goto cleanup;
 594
 595         return obj;
 596
 597 cleanup:
 598         i915_gem_object_free(obj);
 599         return NULL;
 600 }
 601
 602 struct drm_i915_gem_object *
 603 i915_gem_object_create_stolen(struct drm_i915_private *dev_priv, u32 size)
 604 {
 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         if (size == 0)
 613                 return NULL;
 614
 615         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 616         if (!stolen)
 617                 return NULL;
 618
 619         ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
 620         if (ret) {
 621                 kfree(stolen);
 622                 return NULL;
 623         }
 624
 625         obj = _i915_gem_object_create_stolen(dev_priv, stolen);
 626         if (obj)
 627                 return obj;
 628
 629         i915_gem_stolen_remove_node(dev_priv, stolen);
 630         kfree(stolen);
 631         return NULL;
 632 }
 633
 634 struct drm_i915_gem_object *
 635 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv,
 636                                                u32 stolen_offset,
 637                                                u32 gtt_offset,
 638                                                u32 size)
 639 {
 640         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 641         struct drm_i915_gem_object *obj;
 642         struct drm_mm_node *stolen;
 643         struct i915_vma *vma;
 644         int ret;
 645
 646         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 647                 return NULL;
 648
 649         lockdep_assert_held(&dev_priv->drm.struct_mutex);
 650
 651         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 652                         stolen_offset, gtt_offset, size);
 653
 654         /* KISS and expect everything to be page-aligned */
 655         if (WARN_ON(size == 0) ||
 656             WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
 657             WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
 658                 return NULL;
 659
 660         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 661         if (!stolen)
 662                 return NULL;
 663
 664         stolen->start = stolen_offset;
 665         stolen->size = size;
 666         mutex_lock(&dev_priv->mm.stolen_lock);
 667         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 668         mutex_unlock(&dev_priv->mm.stolen_lock);
 669         if (ret) {
 670                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 671                 kfree(stolen);
 672                 return NULL;
 673         }
 674
 675         obj = _i915_gem_object_create_stolen(dev_priv, stolen);
 676         if (obj == NULL) {
 677                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 678                 i915_gem_stolen_remove_node(dev_priv, stolen);
 679                 kfree(stolen);
 680                 return NULL;
 681         }
 682
 683         /* Some objects just need physical mem from stolen space */
 684         if (gtt_offset == I915_GTT_OFFSET_NONE)
 685                 return obj;
 686
 687         ret = i915_gem_object_pin_pages(obj);
 688         if (ret)
 689                 goto err;
 690
 691         vma = i915_vma_instance(obj, &ggtt->base, NULL);
 692         if (IS_ERR(vma)) {
 693                 ret = PTR_ERR(vma);
 694                 goto err_pages;
 695         }
 696
 697         /* To simplify the initialisation sequence between KMS and GTT,
 698          * we allow construction of the stolen object prior to
 699          * setting up the GTT space. The actual reservation will occur
 700          * later.
 701          */
 702         ret = i915_gem_gtt_reserve(&ggtt->base, &vma->node,
 703                                    size, gtt_offset, obj->cache_level,
 704                                    0);
 705         if (ret) {
 706                 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 707                 goto err_pages;
 708         }
 709
 710         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 711
 712         vma->pages = obj->mm.pages;
 713         vma->flags |= I915_VMA_GLOBAL_BIND;
 714         __i915_vma_set_map_and_fenceable(vma);
 715         list_move_tail(&vma->vm_link, &ggtt->base.inactive_list);
 716         list_move_tail(&obj->global_link, &dev_priv->mm.bound_list);
 717         obj->bind_count++;
 718
 719         return obj;
 720
 721 err_pages:
 722         i915_gem_object_unpin_pages(obj);
 723 err:
 724         i915_gem_object_put(obj);
 725         return NULL;
 726 }