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         if (intel_vtd_active() && INTEL_GEN(dev_priv) < 8) {
 418                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 419                 return 0;
 420         }
 421
 422         if (ggtt->stolen_size == 0)
 423                 return 0;
 424
 425         dev_priv->mm.stolen_base = i915_stolen_to_dma(dev_priv);
 426         if (dev_priv->mm.stolen_base == 0)
 427                 return 0;
 428
 429         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 430         reserved_base = 0;
 431         reserved_size = 0;
 432
 433         switch (INTEL_INFO(dev_priv)->gen) {
 434         case 2:
 435         case 3:
 436                 break;
 437         case 4:
 438                 if (IS_G4X(dev_priv))
 439                         g4x_get_stolen_reserved(dev_priv,
 440                                                 &reserved_base, &reserved_size);
 441                 break;
 442         case 5:
 443                 /* Assume the gen6 maximum for the older platforms. */
 444                 reserved_size = 1024 * 1024;
 445                 reserved_base = stolen_top - reserved_size;
 446                 break;
 447         case 6:
 448                 gen6_get_stolen_reserved(dev_priv,
 449                                          &reserved_base, &reserved_size);
 450                 break;
 451         case 7:
 452                 gen7_get_stolen_reserved(dev_priv,
 453                                          &reserved_base, &reserved_size);
 454                 break;
 455         default:
 456                 if (IS_LP(dev_priv))
 457                         chv_get_stolen_reserved(dev_priv,
 458                                                 &reserved_base, &reserved_size);
 459                 else
 460                         bdw_get_stolen_reserved(dev_priv,
 461                                                 &reserved_base, &reserved_size);
 462                 break;
 463         }
 464
 465         /* It is possible for the reserved base to be zero, but the register
 466          * field for size doesn't have a zero option. */
 467         if (reserved_base == 0) {
 468                 reserved_size = 0;
 469                 reserved_base = stolen_top;
 470         }
 471
 472         if (reserved_base < dev_priv->mm.stolen_base ||
 473             reserved_base + reserved_size > stolen_top) {
 474                 dma_addr_t reserved_top = reserved_base + reserved_size;
 475                 DRM_DEBUG_KMS("Stolen reserved area [%pad - %pad] outside stolen memory [%pad - %pad]\n",
 476                               &reserved_base, &reserved_top,
 477                               &dev_priv->mm.stolen_base, &stolen_top);
 478                 return 0;
 479         }
 480
 481         ggtt->stolen_reserved_base = reserved_base;
 482         ggtt->stolen_reserved_size = reserved_size;
 483
 484         /* It is possible for the reserved area to end before the end of stolen
 485          * memory, so just consider the start. */
 486         reserved_total = stolen_top - reserved_base;
 487
 488         DRM_DEBUG_KMS("Memory reserved for graphics device: %uK, usable: %uK\n",
 489                       ggtt->stolen_size >> 10,
 490                       (ggtt->stolen_size - reserved_total) >> 10);
 491
 492         stolen_usable_start = 0;
 493         /* WaSkipStolenMemoryFirstPage:bdw+ */
 494         if (INTEL_GEN(dev_priv) >= 8)
 495                 stolen_usable_start = 4096;
 496
 497         ggtt->stolen_usable_size =
 498                 ggtt->stolen_size - reserved_total - stolen_usable_start;
 499
 500         /* Basic memrange allocator for stolen space. */
 501         drm_mm_init(&dev_priv->mm.stolen, stolen_usable_start,
 502                     ggtt->stolen_usable_size);
 503
 504         return 0;
 505 }
 506
 507 static struct sg_table *
 508 i915_pages_create_for_stolen(struct drm_device *dev,
 509                              u32 offset, u32 size)
 510 {
 511         struct drm_i915_private *dev_priv = to_i915(dev);
 512         struct sg_table *st;
 513         struct scatterlist *sg;
 514
 515         GEM_BUG_ON(range_overflows(offset, size, dev_priv->ggtt.stolen_size));
 516
 517         /* We hide that we have no struct page backing our stolen object
 518          * by wrapping the contiguous physical allocation with a fake
 519          * dma mapping in a single scatterlist.
 520          */
 521
 522         st = kmalloc(sizeof(*st), GFP_KERNEL);
 523         if (st == NULL)
 524                 return ERR_PTR(-ENOMEM);
 525
 526         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 527                 kfree(st);
 528                 return ERR_PTR(-ENOMEM);
 529         }
 530
 531         sg = st->sgl;
 532         sg->offset = 0;
 533         sg->length = size;
 534
 535         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 536         sg_dma_len(sg) = size;
 537
 538         return st;
 539 }
 540
 541 static struct sg_table *
 542 i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 543 {
 544         return i915_pages_create_for_stolen(obj->base.dev,
 545                                             obj->stolen->start,
 546                                             obj->stolen->size);
 547 }
 548
 549 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
 550                                              struct sg_table *pages)
 551 {
 552         /* Should only be called from i915_gem_object_release_stolen() */
 553         sg_free_table(pages);
 554         kfree(pages);
 555 }
 556
 557 static void
 558 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 559 {
 560         struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
 561         struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
 562
 563         GEM_BUG_ON(!stolen);
 564
 565         __i915_gem_object_unpin_pages(obj);
 566
 567         i915_gem_stolen_remove_node(dev_priv, stolen);
 568         kfree(stolen);
 569 }
 570
 571 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 572         .get_pages = i915_gem_object_get_pages_stolen,
 573         .put_pages = i915_gem_object_put_pages_stolen,
 574         .release = i915_gem_object_release_stolen,
 575 };
 576
 577 static struct drm_i915_gem_object *
 578 _i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
 579                                struct drm_mm_node *stolen)
 580 {
 581         struct drm_i915_gem_object *obj;
 582
 583         obj = i915_gem_object_alloc(dev_priv);
 584         if (obj == NULL)
 585                 return NULL;
 586
 587         drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size);
 588         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 589
 590         obj->stolen = stolen;
 591         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 592         obj->cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE;
 593         obj->cache_coherent = true; /* assumptions! more like cache_oblivious */
 594
 595         if (i915_gem_object_pin_pages(obj))
 596                 goto cleanup;
 597
 598         return obj;
 599
 600 cleanup:
 601         i915_gem_object_free(obj);
 602         return NULL;
 603 }
 604
 605 struct drm_i915_gem_object *
 606 i915_gem_object_create_stolen(struct drm_i915_private *dev_priv, u32 size)
 607 {
 608         struct drm_i915_gem_object *obj;
 609         struct drm_mm_node *stolen;
 610         int ret;
 611
 612         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 613                 return NULL;
 614
 615         if (size == 0)
 616                 return NULL;
 617
 618         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 619         if (!stolen)
 620                 return NULL;
 621
 622         ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
 623         if (ret) {
 624                 kfree(stolen);
 625                 return NULL;
 626         }
 627
 628         obj = _i915_gem_object_create_stolen(dev_priv, stolen);
 629         if (obj)
 630                 return obj;
 631
 632         i915_gem_stolen_remove_node(dev_priv, stolen);
 633         kfree(stolen);
 634         return NULL;
 635 }
 636
 637 struct drm_i915_gem_object *
 638 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv,
 639                                                u32 stolen_offset,
 640                                                u32 gtt_offset,
 641                                                u32 size)
 642 {
 643         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 644         struct drm_i915_gem_object *obj;
 645         struct drm_mm_node *stolen;
 646         struct i915_vma *vma;
 647         int ret;
 648
 649         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 650                 return NULL;
 651
 652         lockdep_assert_held(&dev_priv->drm.struct_mutex);
 653
 654         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 655                         stolen_offset, gtt_offset, size);
 656
 657         /* KISS and expect everything to be page-aligned */
 658         if (WARN_ON(size == 0) ||
 659             WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
 660             WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
 661                 return NULL;
 662
 663         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 664         if (!stolen)
 665                 return NULL;
 666
 667         stolen->start = stolen_offset;
 668         stolen->size = size;
 669         mutex_lock(&dev_priv->mm.stolen_lock);
 670         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 671         mutex_unlock(&dev_priv->mm.stolen_lock);
 672         if (ret) {
 673                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 674                 kfree(stolen);
 675                 return NULL;
 676         }
 677
 678         obj = _i915_gem_object_create_stolen(dev_priv, stolen);
 679         if (obj == NULL) {
 680                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 681                 i915_gem_stolen_remove_node(dev_priv, stolen);
 682                 kfree(stolen);
 683                 return NULL;
 684         }
 685
 686         /* Some objects just need physical mem from stolen space */
 687         if (gtt_offset == I915_GTT_OFFSET_NONE)
 688                 return obj;
 689
 690         ret = i915_gem_object_pin_pages(obj);
 691         if (ret)
 692                 goto err;
 693
 694         vma = i915_vma_instance(obj, &ggtt->base, NULL);
 695         if (IS_ERR(vma)) {
 696                 ret = PTR_ERR(vma);
 697                 goto err_pages;
 698         }
 699
 700         /* To simplify the initialisation sequence between KMS and GTT,
 701          * we allow construction of the stolen object prior to
 702          * setting up the GTT space. The actual reservation will occur
 703          * later.
 704          */
 705         ret = i915_gem_gtt_reserve(&ggtt->base, &vma->node,
 706                                    size, gtt_offset, obj->cache_level,
 707                                    0);
 708         if (ret) {
 709                 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 710                 goto err_pages;
 711         }
 712
 713         GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 714
 715         vma->pages = obj->mm.pages;
 716         vma->flags |= I915_VMA_GLOBAL_BIND;
 717         __i915_vma_set_map_and_fenceable(vma);
 718         list_move_tail(&vma->vm_link, &ggtt->base.inactive_list);
 719         list_move_tail(&obj->global_link, &dev_priv->mm.bound_list);
 720         obj->bind_count++;
 721
 722         return obj;
 723
 724 err_pages:
 725         i915_gem_object_unpin_pages(obj);
 726 err:
 727         i915_gem_object_put(obj);
 728         return NULL;
 729 }