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 (incomplete) */
  59         if (INTEL_INFO(dev_priv)->gen == 8 && start < 4096)
  60                 start = 4096;
  61
  62         mutex_lock(&dev_priv->mm.stolen_lock);
  63         ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
  64                                           alignment, start, end,
  65                                           DRM_MM_SEARCH_DEFAULT);
  66         mutex_unlock(&dev_priv->mm.stolen_lock);
  67
  68         return ret;
  69 }
  70
  71 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
  72                                 struct drm_mm_node *node, u64 size,
  73                                 unsigned alignment)
  74 {
  75         struct i915_ggtt *ggtt = &dev_priv->ggtt;
  76
  77         return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
  78                                                     alignment, 0,
  79                                                     ggtt->stolen_usable_size);
  80 }
  81
  82 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
  83                                  struct drm_mm_node *node)
  84 {
  85         mutex_lock(&dev_priv->mm.stolen_lock);
  86         drm_mm_remove_node(node);
  87         mutex_unlock(&dev_priv->mm.stolen_lock);
  88 }
  89
  90 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
  91 {
  92         struct drm_i915_private *dev_priv = to_i915(dev);
  93         struct i915_ggtt *ggtt = &dev_priv->ggtt;
  94         struct resource *r;
  95         u32 base;
  96
  97         /* Almost universally we can find the Graphics Base of Stolen Memory
  98          * at register BSM (0x5c) in the igfx configuration space. On a few
  99          * (desktop) machines this is also mirrored in the bridge device at
 100          * different locations, or in the MCHBAR.
 101          *
 102          * On 865 we just check the TOUD register.
 103          *
 104          * On 830/845/85x the stolen memory base isn't available in any
 105          * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
 106          *
 107          */
 108         base = 0;
 109         if (INTEL_INFO(dev)->gen >= 3) {
 110                 u32 bsm;
 111
 112                 pci_read_config_dword(dev->pdev, BSM, &bsm);
 113
 114                 base = bsm & BSM_MASK;
 115         } else if (IS_I865G(dev)) {
 116                 u16 toud = 0;
 117
 118                 /*
 119                  * FIXME is the graphics stolen memory region
 120                  * always at TOUD? Ie. is it always the last
 121                  * one to be allocated by the BIOS?
 122                  */
 123                 pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
 124                                          I865_TOUD, &toud);
 125
 126                 base = toud << 16;
 127         } else if (IS_I85X(dev)) {
 128                 u32 tseg_size = 0;
 129                 u32 tom;
 130                 u8 tmp;
 131
 132                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 133                                          I85X_ESMRAMC, &tmp);
 134
 135                 if (tmp & TSEG_ENABLE)
 136                         tseg_size = MB(1);
 137
 138                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1),
 139                                          I85X_DRB3, &tmp);
 140                 tom = tmp * MB(32);
 141
 142                 base = tom - tseg_size - ggtt->stolen_size;
 143         } else if (IS_845G(dev)) {
 144                 u32 tseg_size = 0;
 145                 u32 tom;
 146                 u8 tmp;
 147
 148                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 149                                          I845_ESMRAMC, &tmp);
 150
 151                 if (tmp & TSEG_ENABLE) {
 152                         switch (tmp & I845_TSEG_SIZE_MASK) {
 153                         case I845_TSEG_SIZE_512K:
 154                                 tseg_size = KB(512);
 155                                 break;
 156                         case I845_TSEG_SIZE_1M:
 157                                 tseg_size = MB(1);
 158                                 break;
 159                         }
 160                 }
 161
 162                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 163                                          I830_DRB3, &tmp);
 164                 tom = tmp * MB(32);
 165
 166                 base = tom - tseg_size - ggtt->stolen_size;
 167         } else if (IS_I830(dev)) {
 168                 u32 tseg_size = 0;
 169                 u32 tom;
 170                 u8 tmp;
 171
 172                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 173                                          I830_ESMRAMC, &tmp);
 174
 175                 if (tmp & TSEG_ENABLE) {
 176                         if (tmp & I830_TSEG_SIZE_1M)
 177                                 tseg_size = MB(1);
 178                         else
 179                                 tseg_size = KB(512);
 180                 }
 181
 182                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 183                                          I830_DRB3, &tmp);
 184                 tom = tmp * MB(32);
 185
 186                 base = tom - tseg_size - ggtt->stolen_size;
 187         }
 188
 189         if (base == 0)
 190                 return 0;
 191
 192         /* make sure we don't clobber the GTT if it's within stolen memory */
 193         if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
 194                 struct {
 195                         u32 start, end;
 196                 } stolen[2] = {
 197                         { .start = base, .end = base + ggtt->stolen_size, },
 198                         { .start = base, .end = base + ggtt->stolen_size, },
 199                 };
 200                 u64 ggtt_start, ggtt_end;
 201
 202                 ggtt_start = I915_READ(PGTBL_CTL);
 203                 if (IS_GEN4(dev))
 204                         ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
 205                                      (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
 206                 else
 207                         ggtt_start &= PGTBL_ADDRESS_LO_MASK;
 208                 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
 209
 210                 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
 211                         stolen[0].end = ggtt_start;
 212                 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
 213                         stolen[1].start = ggtt_end;
 214
 215                 /* pick the larger of the two chunks */
 216                 if (stolen[0].end - stolen[0].start >
 217                     stolen[1].end - stolen[1].start) {
 218                         base = stolen[0].start;
 219                         ggtt->stolen_size = stolen[0].end - stolen[0].start;
 220                 } else {
 221                         base = stolen[1].start;
 222                         ggtt->stolen_size = stolen[1].end - stolen[1].start;
 223                 }
 224
 225                 if (stolen[0].start != stolen[1].start ||
 226                     stolen[0].end != stolen[1].end) {
 227                         DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
 228                                       (unsigned long long)ggtt_start,
 229                                       (unsigned long long)ggtt_end - 1);
 230                         DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
 231                                       base, base + (u32)ggtt->stolen_size - 1);
 232                 }
 233         }
 234
 235
 236         /* Verify that nothing else uses this physical address. Stolen
 237          * memory should be reserved by the BIOS and hidden from the
 238          * kernel. So if the region is already marked as busy, something
 239          * is seriously wrong.
 240          */
 241         r = devm_request_mem_region(dev->dev, base, ggtt->stolen_size,
 242                                     "Graphics Stolen Memory");
 243         if (r == NULL) {
 244                 /*
 245                  * One more attempt but this time requesting region from
 246                  * base + 1, as we have seen that this resolves the region
 247                  * conflict with the PCI Bus.
 248                  * This is a BIOS w/a: Some BIOS wrap stolen in the root
 249                  * PCI bus, but have an off-by-one error. Hence retry the
 250                  * reservation starting from 1 instead of 0.
 251                  */
 252                 r = devm_request_mem_region(dev->dev, base + 1,
 253                                             ggtt->stolen_size - 1,
 254                                             "Graphics Stolen Memory");
 255                 /*
 256                  * GEN3 firmware likes to smash pci bridges into the stolen
 257                  * range. Apparently this works.
 258                  */
 259                 if (r == NULL && !IS_GEN3(dev)) {
 260                         DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
 261                                   base, base + (uint32_t)ggtt->stolen_size);
 262                         base = 0;
 263                 }
 264         }
 265
 266         return base;
 267 }
 268
 269 void i915_gem_cleanup_stolen(struct drm_device *dev)
 270 {
 271         struct drm_i915_private *dev_priv = dev->dev_private;
 272
 273         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 274                 return;
 275
 276         drm_mm_takedown(&dev_priv->mm.stolen);
 277 }
 278
 279 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 280                                     unsigned long *base, unsigned long *size)
 281 {
 282         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 283         uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 284                                      CTG_STOLEN_RESERVED :
 285                                      ELK_STOLEN_RESERVED);
 286         unsigned long stolen_top = dev_priv->mm.stolen_base +
 287                                    ggtt->stolen_size;
 288
 289         *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 290
 291         WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
 292
 293         /* On these platforms, the register doesn't have a size field, so the
 294          * size is the distance between the base and the top of the stolen
 295          * memory. We also have the genuine case where base is zero and there's
 296          * nothing reserved. */
 297         if (*base == 0)
 298                 *size = 0;
 299         else
 300                 *size = stolen_top - *base;
 301 }
 302
 303 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 304                                      unsigned long *base, unsigned long *size)
 305 {
 306         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 307
 308         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 309
 310         switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
 311         case GEN6_STOLEN_RESERVED_1M:
 312                 *size = 1024 * 1024;
 313                 break;
 314         case GEN6_STOLEN_RESERVED_512K:
 315                 *size = 512 * 1024;
 316                 break;
 317         case GEN6_STOLEN_RESERVED_256K:
 318                 *size = 256 * 1024;
 319                 break;
 320         case GEN6_STOLEN_RESERVED_128K:
 321                 *size = 128 * 1024;
 322                 break;
 323         default:
 324                 *size = 1024 * 1024;
 325                 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
 326         }
 327 }
 328
 329 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 330                                      unsigned long *base, unsigned long *size)
 331 {
 332         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 333
 334         *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
 335
 336         switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
 337         case GEN7_STOLEN_RESERVED_1M:
 338                 *size = 1024 * 1024;
 339                 break;
 340         case GEN7_STOLEN_RESERVED_256K:
 341                 *size = 256 * 1024;
 342                 break;
 343         default:
 344                 *size = 1024 * 1024;
 345                 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
 346         }
 347 }
 348
 349 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
 350                                      unsigned long *base, unsigned long *size)
 351 {
 352         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 353
 354         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 355
 356         switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
 357         case GEN8_STOLEN_RESERVED_1M:
 358                 *size = 1024 * 1024;
 359                 break;
 360         case GEN8_STOLEN_RESERVED_2M:
 361                 *size = 2 * 1024 * 1024;
 362                 break;
 363         case GEN8_STOLEN_RESERVED_4M:
 364                 *size = 4 * 1024 * 1024;
 365                 break;
 366         case GEN8_STOLEN_RESERVED_8M:
 367                 *size = 8 * 1024 * 1024;
 368                 break;
 369         default:
 370                 *size = 8 * 1024 * 1024;
 371                 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
 372         }
 373 }
 374
 375 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 376                                     unsigned long *base, unsigned long *size)
 377 {
 378         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 379         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 380         unsigned long stolen_top;
 381
 382         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 383
 384         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 385
 386         /* On these platforms, the register doesn't have a size field, so the
 387          * size is the distance between the base and the top of the stolen
 388          * memory. We also have the genuine case where base is zero and there's
 389          * nothing reserved. */
 390         if (*base == 0)
 391                 *size = 0;
 392         else
 393                 *size = stolen_top - *base;
 394 }
 395
 396 int i915_gem_init_stolen(struct drm_device *dev)
 397 {
 398         struct drm_i915_private *dev_priv = to_i915(dev);
 399         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 400         unsigned long reserved_total, reserved_base = 0, reserved_size;
 401         unsigned long stolen_top;
 402
 403         mutex_init(&dev_priv->mm.stolen_lock);
 404
 405 #ifdef CONFIG_INTEL_IOMMU
 406         if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
 407                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 408                 return 0;
 409         }
 410 #endif
 411
 412         if (ggtt->stolen_size == 0)
 413                 return 0;
 414
 415         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
 416         if (dev_priv->mm.stolen_base == 0)
 417                 return 0;
 418
 419         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 420
 421         switch (INTEL_INFO(dev_priv)->gen) {
 422         case 2:
 423         case 3:
 424                 break;
 425         case 4:
 426                 if (IS_G4X(dev))
 427                         g4x_get_stolen_reserved(dev_priv, &reserved_base,
 428                                                 &reserved_size);
 429                 break;
 430         case 5:
 431                 /* Assume the gen6 maximum for the older platforms. */
 432                 reserved_size = 1024 * 1024;
 433                 reserved_base = stolen_top - reserved_size;
 434                 break;
 435         case 6:
 436                 gen6_get_stolen_reserved(dev_priv, &reserved_base,
 437                                          &reserved_size);
 438                 break;
 439         case 7:
 440                 gen7_get_stolen_reserved(dev_priv, &reserved_base,
 441                                          &reserved_size);
 442                 break;
 443         default:
 444                 if (IS_BROADWELL(dev_priv) ||
 445                     IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev))
 446                         bdw_get_stolen_reserved(dev_priv, &reserved_base,
 447                                                 &reserved_size);
 448                 else
 449                         gen8_get_stolen_reserved(dev_priv, &reserved_base,
 450                                                  &reserved_size);
 451                 break;
 452         }
 453
 454         /* It is possible for the reserved base to be zero, but the register
 455          * field for size doesn't have a zero option. */
 456         if (reserved_base == 0) {
 457                 reserved_size = 0;
 458                 reserved_base = stolen_top;
 459         }
 460
 461         if (reserved_base < dev_priv->mm.stolen_base ||
 462             reserved_base + reserved_size > stolen_top) {
 463                 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
 464                               reserved_base, reserved_base + reserved_size,
 465                               dev_priv->mm.stolen_base, stolen_top);
 466                 return 0;
 467         }
 468
 469         ggtt->stolen_reserved_base = reserved_base;
 470         ggtt->stolen_reserved_size = reserved_size;
 471
 472         /* It is possible for the reserved area to end before the end of stolen
 473          * memory, so just consider the start. */
 474         reserved_total = stolen_top - reserved_base;
 475
 476         DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
 477                       ggtt->stolen_size >> 10,
 478                       (ggtt->stolen_size - reserved_total) >> 10);
 479
 480         ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total;
 481
 482         /*
 483          * Basic memrange allocator for stolen space.
 484          *
 485          * TODO: Notice that some platforms require us to not use the first page
 486          * of the stolen memory but their BIOSes may still put the framebuffer
 487          * on the first page. So we don't reserve this page for now because of
 488          * that. Our current solution is to just prevent new nodes from being
 489          * inserted on the first page - see the check we have at
 490          * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
 491          * problem later.
 492          */
 493         drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->stolen_usable_size);
 494
 495         return 0;
 496 }
 497
 498 static struct sg_table *
 499 i915_pages_create_for_stolen(struct drm_device *dev,
 500                              u32 offset, u32 size)
 501 {
 502         struct drm_i915_private *dev_priv = to_i915(dev);
 503         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 504         struct sg_table *st;
 505         struct scatterlist *sg;
 506
 507         DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
 508         BUG_ON(offset > ggtt->stolen_size - size);
 509
 510         /* We hide that we have no struct page backing our stolen object
 511          * by wrapping the contiguous physical allocation with a fake
 512          * dma mapping in a single scatterlist.
 513          */
 514
 515         st = kmalloc(sizeof(*st), GFP_KERNEL);
 516         if (st == NULL)
 517                 return NULL;
 518
 519         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 520                 kfree(st);
 521                 return NULL;
 522         }
 523
 524         sg = st->sgl;
 525         sg->offset = 0;
 526         sg->length = size;
 527
 528         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 529         sg_dma_len(sg) = size;
 530
 531         return st;
 532 }
 533
 534 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 535 {
 536         BUG();
 537         return -EINVAL;
 538 }
 539
 540 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
 541 {
 542         /* Should only be called during free */
 543         sg_free_table(obj->pages);
 544         kfree(obj->pages);
 545 }
 546
 547
 548 static void
 549 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 550 {
 551         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
 552
 553         if (obj->stolen) {
 554                 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
 555                 kfree(obj->stolen);
 556                 obj->stolen = NULL;
 557         }
 558 }
 559 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 560         .get_pages = i915_gem_object_get_pages_stolen,
 561         .put_pages = i915_gem_object_put_pages_stolen,
 562         .release = i915_gem_object_release_stolen,
 563 };
 564
 565 static struct drm_i915_gem_object *
 566 _i915_gem_object_create_stolen(struct drm_device *dev,
 567                                struct drm_mm_node *stolen)
 568 {
 569         struct drm_i915_gem_object *obj;
 570
 571         obj = i915_gem_object_alloc(dev);
 572         if (obj == NULL)
 573                 return NULL;
 574
 575         drm_gem_private_object_init(dev, &obj->base, stolen->size);
 576         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 577
 578         obj->pages = i915_pages_create_for_stolen(dev,
 579                                                   stolen->start, stolen->size);
 580         if (obj->pages == NULL)
 581                 goto cleanup;
 582
 583         obj->get_page.sg = obj->pages->sgl;
 584         obj->get_page.last = 0;
 585
 586         i915_gem_object_pin_pages(obj);
 587         obj->stolen = stolen;
 588
 589         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 590         obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
 591
 592         return obj;
 593
 594 cleanup:
 595         i915_gem_object_free(obj);
 596         return NULL;
 597 }
 598
 599 struct drm_i915_gem_object *
 600 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
 601 {
 602         struct drm_i915_private *dev_priv = dev->dev_private;
 603         struct drm_i915_gem_object *obj;
 604         struct drm_mm_node *stolen;
 605         int ret;
 606
 607         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 608                 return NULL;
 609
 610         DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
 611         if (size == 0)
 612                 return NULL;
 613
 614         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 615         if (!stolen)
 616                 return NULL;
 617
 618         ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
 619         if (ret) {
 620                 kfree(stolen);
 621                 return NULL;
 622         }
 623
 624         obj = _i915_gem_object_create_stolen(dev, stolen);
 625         if (obj)
 626                 return obj;
 627
 628         i915_gem_stolen_remove_node(dev_priv, stolen);
 629         kfree(stolen);
 630         return NULL;
 631 }
 632
 633 struct drm_i915_gem_object *
 634 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 635                                                u32 stolen_offset,
 636                                                u32 gtt_offset,
 637                                                u32 size)
 638 {
 639         struct drm_i915_private *dev_priv = to_i915(dev);
 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->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) || WARN_ON(size & 4095) ||
 656             WARN_ON(stolen_offset & 4095))
 657                 return NULL;
 658
 659         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 660         if (!stolen)
 661                 return NULL;
 662
 663         stolen->start = stolen_offset;
 664         stolen->size = size;
 665         mutex_lock(&dev_priv->mm.stolen_lock);
 666         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 667         mutex_unlock(&dev_priv->mm.stolen_lock);
 668         if (ret) {
 669                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 670                 kfree(stolen);
 671                 return NULL;
 672         }
 673
 674         obj = _i915_gem_object_create_stolen(dev, stolen);
 675         if (obj == NULL) {
 676                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 677                 i915_gem_stolen_remove_node(dev_priv, stolen);
 678                 kfree(stolen);
 679                 return NULL;
 680         }
 681
 682         /* Some objects just need physical mem from stolen space */
 683         if (gtt_offset == I915_GTT_OFFSET_NONE)
 684                 return obj;
 685
 686         vma = i915_gem_obj_lookup_or_create_vma(obj, &ggtt->base);
 687         if (IS_ERR(vma)) {
 688                 ret = PTR_ERR(vma);
 689                 goto err;
 690         }
 691
 692         /* To simplify the initialisation sequence between KMS and GTT,
 693          * we allow construction of the stolen object prior to
 694          * setting up the GTT space. The actual reservation will occur
 695          * later.
 696          */
 697         vma->node.start = gtt_offset;
 698         vma->node.size = size;
 699         if (drm_mm_initialized(&ggtt->base.mm)) {
 700                 ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node);
 701                 if (ret) {
 702                         DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 703                         goto err;
 704                 }
 705
 706                 vma->bound |= GLOBAL_BIND;
 707                 __i915_vma_set_map_and_fenceable(vma);
 708                 list_add_tail(&vma->vm_link, &ggtt->base.inactive_list);
 709         }
 710
 711         list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
 712         i915_gem_object_pin_pages(obj);
 713
 714         return obj;
 715
 716 err:
 717         drm_gem_object_unreference(&obj->base);
 718         return NULL;
 719 }