drivers/gpu/drm/i915/i915_gem_stolen.c

   1 /*
   2  * Copyright © 2008-2012 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *    Chris Wilson <chris@chris-wilson.co.uk>
  26  *
  27  */
  28
  29 #include <drm/drmP.h>
  30 #include <drm/i915_drm.h>
  31 #include "i915_drv.h"
  32
  33 #define KB(x) ((x) * 1024)
  34 #define MB(x) (KB(x) * 1024)
  35
  36 /*
  37  * The BIOS typically reserves some of the system's memory for the exclusive
  38  * use of the integrated graphics. This memory is no longer available for
  39  * use by the OS and so the user finds that his system has less memory
  40  * available than he put in. We refer to this memory as stolen.
  41  *
  42  * The BIOS will allocate its framebuffer from the stolen memory. Our
  43  * goal is try to reuse that object for our own fbcon which must always
  44  * be available for panics. Anything else we can reuse the stolen memory
  45  * for is a boon.
  46  */
  47
  48 int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv,
  49                                          struct drm_mm_node *node, u64 size,
  50                                          unsigned alignment, u64 start, u64 end)
  51 {
  52         int ret;
  53
  54         if (!drm_mm_initialized(&dev_priv->mm.stolen))
  55                 return -ENODEV;
  56
  57         /* See the comment at the drm_mm_init() call for more about this check.
  58          * WaSkipStolenMemoryFirstPage:bdw,chv,kbl (incomplete)
  59          */
  60         if (start < 4096 && (IS_GEN8(dev_priv) ||
  61                              IS_KBL_REVID(dev_priv, 0, KBL_REVID_A0)))
  62                 start = 4096;
  63
  64         mutex_lock(&dev_priv->mm.stolen_lock);
  65         ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
  66                                           alignment, start, end,
  67                                           DRM_MM_SEARCH_DEFAULT);
  68         mutex_unlock(&dev_priv->mm.stolen_lock);
  69
  70         return ret;
  71 }
  72
  73 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
  74                                 struct drm_mm_node *node, u64 size,
  75                                 unsigned alignment)
  76 {
  77         struct i915_ggtt *ggtt = &dev_priv->ggtt;
  78
  79         return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
  80                                                     alignment, 0,
  81                                                     ggtt->stolen_usable_size);
  82 }
  83
  84 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
  85                                  struct drm_mm_node *node)
  86 {
  87         mutex_lock(&dev_priv->mm.stolen_lock);
  88         drm_mm_remove_node(node);
  89         mutex_unlock(&dev_priv->mm.stolen_lock);
  90 }
  91
  92 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
  93 {
  94         struct drm_i915_private *dev_priv = to_i915(dev);
  95         struct pci_dev *pdev = dev_priv->drm.pdev;
  96         struct i915_ggtt *ggtt = &dev_priv->ggtt;
  97         struct resource *r;
  98         u32 base;
  99
 100         /* Almost universally we can find the Graphics Base of Stolen Memory
 101          * at register BSM (0x5c) in the igfx configuration space. On a few
 102          * (desktop) machines this is also mirrored in the bridge device at
 103          * different locations, or in the MCHBAR.
 104          *
 105          * On 865 we just check the TOUD register.
 106          *
 107          * On 830/845/85x the stolen memory base isn't available in any
 108          * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
 109          *
 110          */
 111         base = 0;
 112         if (INTEL_INFO(dev)->gen >= 3) {
 113                 u32 bsm;
 114
 115                 pci_read_config_dword(pdev, INTEL_BSM, &bsm);
 116
 117                 base = bsm & INTEL_BSM_MASK;
 118         } else if (IS_I865G(dev_priv)) {
 119                 u32 tseg_size = 0;
 120                 u16 toud = 0;
 121                 u8 tmp;
 122
 123                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 124                                          I845_ESMRAMC, &tmp);
 125
 126                 if (tmp & TSEG_ENABLE) {
 127                         switch (tmp & I845_TSEG_SIZE_MASK) {
 128                         case I845_TSEG_SIZE_512K:
 129                                 tseg_size = KB(512);
 130                                 break;
 131                         case I845_TSEG_SIZE_1M:
 132                                 tseg_size = MB(1);
 133                                 break;
 134                         }
 135                 }
 136
 137                 pci_bus_read_config_word(pdev->bus, PCI_DEVFN(0, 0),
 138                                          I865_TOUD, &toud);
 139
 140                 base = (toud << 16) + tseg_size;
 141         } else if (IS_I85X(dev)) {
 142                 u32 tseg_size = 0;
 143                 u32 tom;
 144                 u8 tmp;
 145
 146                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 147                                          I85X_ESMRAMC, &tmp);
 148
 149                 if (tmp & TSEG_ENABLE)
 150                         tseg_size = MB(1);
 151
 152                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 1),
 153                                          I85X_DRB3, &tmp);
 154                 tom = tmp * MB(32);
 155
 156                 base = tom - tseg_size - ggtt->stolen_size;
 157         } else if (IS_845G(dev_priv)) {
 158                 u32 tseg_size = 0;
 159                 u32 tom;
 160                 u8 tmp;
 161
 162                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 163                                          I845_ESMRAMC, &tmp);
 164
 165                 if (tmp & TSEG_ENABLE) {
 166                         switch (tmp & I845_TSEG_SIZE_MASK) {
 167                         case I845_TSEG_SIZE_512K:
 168                                 tseg_size = KB(512);
 169                                 break;
 170                         case I845_TSEG_SIZE_1M:
 171                                 tseg_size = MB(1);
 172                                 break;
 173                         }
 174                 }
 175
 176                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 177                                          I830_DRB3, &tmp);
 178                 tom = tmp * MB(32);
 179
 180                 base = tom - tseg_size - ggtt->stolen_size;
 181         } else if (IS_I830(dev_priv)) {
 182                 u32 tseg_size = 0;
 183                 u32 tom;
 184                 u8 tmp;
 185
 186                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 187                                          I830_ESMRAMC, &tmp);
 188
 189                 if (tmp & TSEG_ENABLE) {
 190                         if (tmp & I830_TSEG_SIZE_1M)
 191                                 tseg_size = MB(1);
 192                         else
 193                                 tseg_size = KB(512);
 194                 }
 195
 196                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 197                                          I830_DRB3, &tmp);
 198                 tom = tmp * MB(32);
 199
 200                 base = tom - tseg_size - ggtt->stolen_size;
 201         }
 202
 203         if (base == 0)
 204                 return 0;
 205
 206         /* make sure we don't clobber the GTT if it's within stolen memory */
 207         if (INTEL_GEN(dev_priv) <= 4 && !IS_G33(dev_priv) &&
 208             !IS_G4X(dev_priv)) {
 209                 struct {
 210                         u32 start, end;
 211                 } stolen[2] = {
 212                         { .start = base, .end = base + ggtt->stolen_size, },
 213                         { .start = base, .end = base + ggtt->stolen_size, },
 214                 };
 215                 u64 ggtt_start, ggtt_end;
 216
 217                 ggtt_start = I915_READ(PGTBL_CTL);
 218                 if (IS_GEN4(dev_priv))
 219                         ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
 220                                      (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
 221                 else
 222                         ggtt_start &= PGTBL_ADDRESS_LO_MASK;
 223                 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
 224
 225                 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
 226                         stolen[0].end = ggtt_start;
 227                 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
 228                         stolen[1].start = ggtt_end;
 229
 230                 /* pick the larger of the two chunks */
 231                 if (stolen[0].end - stolen[0].start >
 232                     stolen[1].end - stolen[1].start) {
 233                         base = stolen[0].start;
 234                         ggtt->stolen_size = stolen[0].end - stolen[0].start;
 235                 } else {
 236                         base = stolen[1].start;
 237                         ggtt->stolen_size = stolen[1].end - stolen[1].start;
 238                 }
 239
 240                 if (stolen[0].start != stolen[1].start ||
 241                     stolen[0].end != stolen[1].end) {
 242                         DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
 243                                       (unsigned long long)ggtt_start,
 244                                       (unsigned long long)ggtt_end - 1);
 245                         DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
 246                                       base, base + (u32)ggtt->stolen_size - 1);
 247                 }
 248         }
 249
 250
 251         /* Verify that nothing else uses this physical address. Stolen
 252          * memory should be reserved by the BIOS and hidden from the
 253          * kernel. So if the region is already marked as busy, something
 254          * is seriously wrong.
 255          */
 256         r = devm_request_mem_region(dev->dev, base, ggtt->stolen_size,
 257                                     "Graphics Stolen Memory");
 258         if (r == NULL) {
 259                 /*
 260                  * One more attempt but this time requesting region from
 261                  * base + 1, as we have seen that this resolves the region
 262                  * conflict with the PCI Bus.
 263                  * This is a BIOS w/a: Some BIOS wrap stolen in the root
 264                  * PCI bus, but have an off-by-one error. Hence retry the
 265                  * reservation starting from 1 instead of 0.
 266                  */
 267                 r = devm_request_mem_region(dev->dev, base + 1,
 268                                             ggtt->stolen_size - 1,
 269                                             "Graphics Stolen Memory");
 270                 /*
 271                  * GEN3 firmware likes to smash pci bridges into the stolen
 272                  * range. Apparently this works.
 273                  */
 274                 if (r == NULL && !IS_GEN3(dev_priv)) {
 275                         DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
 276                                   base, base + (uint32_t)ggtt->stolen_size);
 277                         base = 0;
 278                 }
 279         }
 280
 281         return base;
 282 }
 283
 284 void i915_gem_cleanup_stolen(struct drm_device *dev)
 285 {
 286         struct drm_i915_private *dev_priv = to_i915(dev);
 287
 288         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 289                 return;
 290
 291         drm_mm_takedown(&dev_priv->mm.stolen);
 292 }
 293
 294 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 295                                     unsigned long *base, unsigned long *size)
 296 {
 297         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 298         uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 299                                      CTG_STOLEN_RESERVED :
 300                                      ELK_STOLEN_RESERVED);
 301         unsigned long stolen_top = dev_priv->mm.stolen_base +
 302                                    ggtt->stolen_size;
 303
 304         *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 305
 306         WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
 307
 308         /* On these platforms, the register doesn't have a size field, so the
 309          * size is the distance between the base and the top of the stolen
 310          * memory. We also have the genuine case where base is zero and there's
 311          * nothing reserved. */
 312         if (*base == 0)
 313                 *size = 0;
 314         else
 315                 *size = stolen_top - *base;
 316 }
 317
 318 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 319                                      unsigned long *base, unsigned long *size)
 320 {
 321         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 322
 323         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 324
 325         switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
 326         case GEN6_STOLEN_RESERVED_1M:
 327                 *size = 1024 * 1024;
 328                 break;
 329         case GEN6_STOLEN_RESERVED_512K:
 330                 *size = 512 * 1024;
 331                 break;
 332         case GEN6_STOLEN_RESERVED_256K:
 333                 *size = 256 * 1024;
 334                 break;
 335         case GEN6_STOLEN_RESERVED_128K:
 336                 *size = 128 * 1024;
 337                 break;
 338         default:
 339                 *size = 1024 * 1024;
 340                 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
 341         }
 342 }
 343
 344 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 345                                      unsigned long *base, unsigned long *size)
 346 {
 347         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 348
 349         *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
 350
 351         switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
 352         case GEN7_STOLEN_RESERVED_1M:
 353                 *size = 1024 * 1024;
 354                 break;
 355         case GEN7_STOLEN_RESERVED_256K:
 356                 *size = 256 * 1024;
 357                 break;
 358         default:
 359                 *size = 1024 * 1024;
 360                 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
 361         }
 362 }
 363
 364 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
 365                                      unsigned long *base, unsigned long *size)
 366 {
 367         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 368
 369         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 370
 371         switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
 372         case GEN8_STOLEN_RESERVED_1M:
 373                 *size = 1024 * 1024;
 374                 break;
 375         case GEN8_STOLEN_RESERVED_2M:
 376                 *size = 2 * 1024 * 1024;
 377                 break;
 378         case GEN8_STOLEN_RESERVED_4M:
 379                 *size = 4 * 1024 * 1024;
 380                 break;
 381         case GEN8_STOLEN_RESERVED_8M:
 382                 *size = 8 * 1024 * 1024;
 383                 break;
 384         default:
 385                 *size = 8 * 1024 * 1024;
 386                 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
 387         }
 388 }
 389
 390 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 391                                     unsigned long *base, unsigned long *size)
 392 {
 393         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 394         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 395         unsigned long stolen_top;
 396
 397         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 398
 399         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 400
 401         /* On these platforms, the register doesn't have a size field, so the
 402          * size is the distance between the base and the top of the stolen
 403          * memory. We also have the genuine case where base is zero and there's
 404          * nothing reserved. */
 405         if (*base == 0)
 406                 *size = 0;
 407         else
 408                 *size = stolen_top - *base;
 409 }
 410
 411 int i915_gem_init_stolen(struct drm_device *dev)
 412 {
 413         struct drm_i915_private *dev_priv = to_i915(dev);
 414         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 415         unsigned long reserved_total, reserved_base = 0, reserved_size;
 416         unsigned long stolen_top;
 417
 418         mutex_init(&dev_priv->mm.stolen_lock);
 419
 420 #ifdef CONFIG_INTEL_IOMMU
 421         if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
 422                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 423                 return 0;
 424         }
 425 #endif
 426
 427         if (ggtt->stolen_size == 0)
 428                 return 0;
 429
 430         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
 431         if (dev_priv->mm.stolen_base == 0)
 432                 return 0;
 433
 434         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 435
 436         switch (INTEL_INFO(dev_priv)->gen) {
 437         case 2:
 438         case 3:
 439                 break;
 440         case 4:
 441                 if (IS_G4X(dev_priv))
 442                         g4x_get_stolen_reserved(dev_priv, &reserved_base,
 443                                                 &reserved_size);
 444                 break;
 445         case 5:
 446                 /* Assume the gen6 maximum for the older platforms. */
 447                 reserved_size = 1024 * 1024;
 448                 reserved_base = stolen_top - reserved_size;
 449                 break;
 450         case 6:
 451                 gen6_get_stolen_reserved(dev_priv, &reserved_base,
 452                                          &reserved_size);
 453                 break;
 454         case 7:
 455                 gen7_get_stolen_reserved(dev_priv, &reserved_base,
 456                                          &reserved_size);
 457                 break;
 458         default:
 459                 if (IS_BROADWELL(dev_priv) ||
 460                     IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv))
 461                         bdw_get_stolen_reserved(dev_priv, &reserved_base,
 462                                                 &reserved_size);
 463                 else
 464                         gen8_get_stolen_reserved(dev_priv, &reserved_base,
 465                                                  &reserved_size);
 466                 break;
 467         }
 468
 469         /* It is possible for the reserved base to be zero, but the register
 470          * field for size doesn't have a zero option. */
 471         if (reserved_base == 0) {
 472                 reserved_size = 0;
 473                 reserved_base = stolen_top;
 474         }
 475
 476         if (reserved_base < dev_priv->mm.stolen_base ||
 477             reserved_base + reserved_size > stolen_top) {
 478                 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
 479                               reserved_base, reserved_base + reserved_size,
 480                               dev_priv->mm.stolen_base, stolen_top);
 481                 return 0;
 482         }
 483
 484         ggtt->stolen_reserved_base = reserved_base;
 485         ggtt->stolen_reserved_size = reserved_size;
 486
 487         /* It is possible for the reserved area to end before the end of stolen
 488          * memory, so just consider the start. */
 489         reserved_total = stolen_top - reserved_base;
 490
 491         DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
 492                       ggtt->stolen_size >> 10,
 493                       (ggtt->stolen_size - reserved_total) >> 10);
 494
 495         ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total;
 496
 497         /*
 498          * Basic memrange allocator for stolen space.
 499          *
 500          * TODO: Notice that some platforms require us to not use the first page
 501          * of the stolen memory but their BIOSes may still put the framebuffer
 502          * on the first page. So we don't reserve this page for now because of
 503          * that. Our current solution is to just prevent new nodes from being
 504          * inserted on the first page - see the check we have at
 505          * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
 506          * problem later.
 507          */
 508         drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->stolen_usable_size);
 509
 510         return 0;
 511 }
 512
 513 static struct sg_table *
 514 i915_pages_create_for_stolen(struct drm_device *dev,
 515                              u32 offset, u32 size)
 516 {
 517         struct drm_i915_private *dev_priv = to_i915(dev);
 518         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 519         struct sg_table *st;
 520         struct scatterlist *sg;
 521
 522         DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
 523         BUG_ON(offset > ggtt->stolen_size - size);
 524
 525         /* We hide that we have no struct page backing our stolen object
 526          * by wrapping the contiguous physical allocation with a fake
 527          * dma mapping in a single scatterlist.
 528          */
 529
 530         st = kmalloc(sizeof(*st), GFP_KERNEL);
 531         if (st == NULL)
 532                 return NULL;
 533
 534         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 535                 kfree(st);
 536                 return NULL;
 537         }
 538
 539         sg = st->sgl;
 540         sg->offset = 0;
 541         sg->length = size;
 542
 543         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 544         sg_dma_len(sg) = size;
 545
 546         return st;
 547 }
 548
 549 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 550 {
 551         BUG();
 552         return -EINVAL;
 553 }
 554
 555 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
 556 {
 557         /* Should only be called during free */
 558         sg_free_table(obj->pages);
 559         kfree(obj->pages);
 560 }
 561
 562
 563 static void
 564 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 565 {
 566         struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
 567
 568         if (obj->stolen) {
 569                 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
 570                 kfree(obj->stolen);
 571                 obj->stolen = NULL;
 572         }
 573 }
 574 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 575         .get_pages = i915_gem_object_get_pages_stolen,
 576         .put_pages = i915_gem_object_put_pages_stolen,
 577         .release = i915_gem_object_release_stolen,
 578 };
 579
 580 static struct drm_i915_gem_object *
 581 _i915_gem_object_create_stolen(struct drm_device *dev,
 582                                struct drm_mm_node *stolen)
 583 {
 584         struct drm_i915_gem_object *obj;
 585
 586         obj = i915_gem_object_alloc(dev);
 587         if (obj == NULL)
 588                 return NULL;
 589
 590         drm_gem_private_object_init(dev, &obj->base, stolen->size);
 591         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 592
 593         obj->pages = i915_pages_create_for_stolen(dev,
 594                                                   stolen->start, stolen->size);
 595         if (obj->pages == NULL)
 596                 goto cleanup;
 597
 598         obj->get_page.sg = obj->pages->sgl;
 599         obj->get_page.last = 0;
 600
 601         i915_gem_object_pin_pages(obj);
 602         obj->stolen = stolen;
 603
 604         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 605         obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
 606
 607         return obj;
 608
 609 cleanup:
 610         i915_gem_object_free(obj);
 611         return NULL;
 612 }
 613
 614 struct drm_i915_gem_object *
 615 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
 616 {
 617         struct drm_i915_private *dev_priv = to_i915(dev);
 618         struct drm_i915_gem_object *obj;
 619         struct drm_mm_node *stolen;
 620         int ret;
 621
 622         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 623                 return NULL;
 624
 625         DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
 626         if (size == 0)
 627                 return NULL;
 628
 629         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 630         if (!stolen)
 631                 return NULL;
 632
 633         ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
 634         if (ret) {
 635                 kfree(stolen);
 636                 return NULL;
 637         }
 638
 639         obj = _i915_gem_object_create_stolen(dev, stolen);
 640         if (obj)
 641                 return obj;
 642
 643         i915_gem_stolen_remove_node(dev_priv, stolen);
 644         kfree(stolen);
 645         return NULL;
 646 }
 647
 648 struct drm_i915_gem_object *
 649 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 650                                                u32 stolen_offset,
 651                                                u32 gtt_offset,
 652                                                u32 size)
 653 {
 654         struct drm_i915_private *dev_priv = to_i915(dev);
 655         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 656         struct drm_i915_gem_object *obj;
 657         struct drm_mm_node *stolen;
 658         struct i915_vma *vma;
 659         int ret;
 660
 661         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 662                 return NULL;
 663
 664         lockdep_assert_held(&dev->struct_mutex);
 665
 666         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 667                         stolen_offset, gtt_offset, size);
 668
 669         /* KISS and expect everything to be page-aligned */
 670         if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
 671             WARN_ON(stolen_offset & 4095))
 672                 return NULL;
 673
 674         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 675         if (!stolen)
 676                 return NULL;
 677
 678         stolen->start = stolen_offset;
 679         stolen->size = size;
 680         mutex_lock(&dev_priv->mm.stolen_lock);
 681         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 682         mutex_unlock(&dev_priv->mm.stolen_lock);
 683         if (ret) {
 684                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 685                 kfree(stolen);
 686                 return NULL;
 687         }
 688
 689         obj = _i915_gem_object_create_stolen(dev, stolen);
 690         if (obj == NULL) {
 691                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 692                 i915_gem_stolen_remove_node(dev_priv, stolen);
 693                 kfree(stolen);
 694                 return NULL;
 695         }
 696
 697         /* Some objects just need physical mem from stolen space */
 698         if (gtt_offset == I915_GTT_OFFSET_NONE)
 699                 return obj;
 700
 701         vma = i915_gem_obj_lookup_or_create_vma(obj, &ggtt->base, NULL);
 702         if (IS_ERR(vma)) {
 703                 ret = PTR_ERR(vma);
 704                 goto err;
 705         }
 706
 707         /* To simplify the initialisation sequence between KMS and GTT,
 708          * we allow construction of the stolen object prior to
 709          * setting up the GTT space. The actual reservation will occur
 710          * later.
 711          */
 712         vma->node.start = gtt_offset;
 713         vma->node.size = size;
 714
 715         ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node);
 716         if (ret) {
 717                 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 718                 goto err;
 719         }
 720
 721         vma->pages = obj->pages;
 722         vma->flags |= I915_VMA_GLOBAL_BIND;
 723         __i915_vma_set_map_and_fenceable(vma);
 724         list_move_tail(&vma->vm_link, &ggtt->base.inactive_list);
 725         obj->bind_count++;
 726
 727         list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
 728         i915_gem_object_pin_pages(obj);
 729
 730         return obj;
 731
 732 err:
 733         i915_gem_object_put(obj);
 734         return NULL;
 735 }