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+ (incomplete)
  59          */
  60         if (start < 4096 && INTEL_GEN(dev_priv) >= 8)
  61                 start = 4096;
  62
  63         mutex_lock(&dev_priv->mm.stolen_lock);
  64         ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size,
  65                                           alignment, start, end,
  66                                           DRM_MM_SEARCH_DEFAULT);
  67         mutex_unlock(&dev_priv->mm.stolen_lock);
  68
  69         return ret;
  70 }
  71
  72 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv,
  73                                 struct drm_mm_node *node, u64 size,
  74                                 unsigned alignment)
  75 {
  76         struct i915_ggtt *ggtt = &dev_priv->ggtt;
  77
  78         return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
  79                                                     alignment, 0,
  80                                                     ggtt->stolen_usable_size);
  81 }
  82
  83 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
  84                                  struct drm_mm_node *node)
  85 {
  86         mutex_lock(&dev_priv->mm.stolen_lock);
  87         drm_mm_remove_node(node);
  88         mutex_unlock(&dev_priv->mm.stolen_lock);
  89 }
  90
  91 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
  92 {
  93         struct drm_i915_private *dev_priv = to_i915(dev);
  94         struct pci_dev *pdev = dev_priv->drm.pdev;
  95         struct i915_ggtt *ggtt = &dev_priv->ggtt;
  96         struct resource *r;
  97         u32 base;
  98
  99         /* Almost universally we can find the Graphics Base of Stolen Memory
 100          * at register BSM (0x5c) in the igfx configuration space. On a few
 101          * (desktop) machines this is also mirrored in the bridge device at
 102          * different locations, or in the MCHBAR.
 103          *
 104          * On 865 we just check the TOUD register.
 105          *
 106          * On 830/845/85x the stolen memory base isn't available in any
 107          * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
 108          *
 109          */
 110         base = 0;
 111         if (INTEL_INFO(dev)->gen >= 3) {
 112                 u32 bsm;
 113
 114                 pci_read_config_dword(pdev, INTEL_BSM, &bsm);
 115
 116                 base = bsm & INTEL_BSM_MASK;
 117         } else if (IS_I865G(dev)) {
 118                 u32 tseg_size = 0;
 119                 u16 toud = 0;
 120                 u8 tmp;
 121
 122                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 123                                          I845_ESMRAMC, &tmp);
 124
 125                 if (tmp & TSEG_ENABLE) {
 126                         switch (tmp & I845_TSEG_SIZE_MASK) {
 127                         case I845_TSEG_SIZE_512K:
 128                                 tseg_size = KB(512);
 129                                 break;
 130                         case I845_TSEG_SIZE_1M:
 131                                 tseg_size = MB(1);
 132                                 break;
 133                         }
 134                 }
 135
 136                 pci_bus_read_config_word(pdev->bus, PCI_DEVFN(0, 0),
 137                                          I865_TOUD, &toud);
 138
 139                 base = (toud << 16) + tseg_size;
 140         } else if (IS_I85X(dev)) {
 141                 u32 tseg_size = 0;
 142                 u32 tom;
 143                 u8 tmp;
 144
 145                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 146                                          I85X_ESMRAMC, &tmp);
 147
 148                 if (tmp & TSEG_ENABLE)
 149                         tseg_size = MB(1);
 150
 151                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 1),
 152                                          I85X_DRB3, &tmp);
 153                 tom = tmp * MB(32);
 154
 155                 base = tom - tseg_size - ggtt->stolen_size;
 156         } else if (IS_845G(dev)) {
 157                 u32 tseg_size = 0;
 158                 u32 tom;
 159                 u8 tmp;
 160
 161                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 162                                          I845_ESMRAMC, &tmp);
 163
 164                 if (tmp & TSEG_ENABLE) {
 165                         switch (tmp & I845_TSEG_SIZE_MASK) {
 166                         case I845_TSEG_SIZE_512K:
 167                                 tseg_size = KB(512);
 168                                 break;
 169                         case I845_TSEG_SIZE_1M:
 170                                 tseg_size = MB(1);
 171                                 break;
 172                         }
 173                 }
 174
 175                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 176                                          I830_DRB3, &tmp);
 177                 tom = tmp * MB(32);
 178
 179                 base = tom - tseg_size - ggtt->stolen_size;
 180         } else if (IS_I830(dev)) {
 181                 u32 tseg_size = 0;
 182                 u32 tom;
 183                 u8 tmp;
 184
 185                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 186                                          I830_ESMRAMC, &tmp);
 187
 188                 if (tmp & TSEG_ENABLE) {
 189                         if (tmp & I830_TSEG_SIZE_1M)
 190                                 tseg_size = MB(1);
 191                         else
 192                                 tseg_size = KB(512);
 193                 }
 194
 195                 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0),
 196                                          I830_DRB3, &tmp);
 197                 tom = tmp * MB(32);
 198
 199                 base = tom - tseg_size - ggtt->stolen_size;
 200         }
 201
 202         if (base == 0)
 203                 return 0;
 204
 205         /* make sure we don't clobber the GTT if it's within stolen memory */
 206         if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
 207                 struct {
 208                         u32 start, end;
 209                 } stolen[2] = {
 210                         { .start = base, .end = base + ggtt->stolen_size, },
 211                         { .start = base, .end = base + ggtt->stolen_size, },
 212                 };
 213                 u64 ggtt_start, ggtt_end;
 214
 215                 ggtt_start = I915_READ(PGTBL_CTL);
 216                 if (IS_GEN4(dev))
 217                         ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
 218                                      (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
 219                 else
 220                         ggtt_start &= PGTBL_ADDRESS_LO_MASK;
 221                 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4;
 222
 223                 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end)
 224                         stolen[0].end = ggtt_start;
 225                 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end)
 226                         stolen[1].start = ggtt_end;
 227
 228                 /* pick the larger of the two chunks */
 229                 if (stolen[0].end - stolen[0].start >
 230                     stolen[1].end - stolen[1].start) {
 231                         base = stolen[0].start;
 232                         ggtt->stolen_size = stolen[0].end - stolen[0].start;
 233                 } else {
 234                         base = stolen[1].start;
 235                         ggtt->stolen_size = stolen[1].end - stolen[1].start;
 236                 }
 237
 238                 if (stolen[0].start != stolen[1].start ||
 239                     stolen[0].end != stolen[1].end) {
 240                         DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
 241                                       (unsigned long long)ggtt_start,
 242                                       (unsigned long long)ggtt_end - 1);
 243                         DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
 244                                       base, base + (u32)ggtt->stolen_size - 1);
 245                 }
 246         }
 247
 248
 249         /* Verify that nothing else uses this physical address. Stolen
 250          * memory should be reserved by the BIOS and hidden from the
 251          * kernel. So if the region is already marked as busy, something
 252          * is seriously wrong.
 253          */
 254         r = devm_request_mem_region(dev->dev, base, ggtt->stolen_size,
 255                                     "Graphics Stolen Memory");
 256         if (r == NULL) {
 257                 /*
 258                  * One more attempt but this time requesting region from
 259                  * base + 1, as we have seen that this resolves the region
 260                  * conflict with the PCI Bus.
 261                  * This is a BIOS w/a: Some BIOS wrap stolen in the root
 262                  * PCI bus, but have an off-by-one error. Hence retry the
 263                  * reservation starting from 1 instead of 0.
 264                  */
 265                 r = devm_request_mem_region(dev->dev, base + 1,
 266                                             ggtt->stolen_size - 1,
 267                                             "Graphics Stolen Memory");
 268                 /*
 269                  * GEN3 firmware likes to smash pci bridges into the stolen
 270                  * range. Apparently this works.
 271                  */
 272                 if (r == NULL && !IS_GEN3(dev)) {
 273                         DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
 274                                   base, base + (uint32_t)ggtt->stolen_size);
 275                         base = 0;
 276                 }
 277         }
 278
 279         return base;
 280 }
 281
 282 void i915_gem_cleanup_stolen(struct drm_device *dev)
 283 {
 284         struct drm_i915_private *dev_priv = to_i915(dev);
 285
 286         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 287                 return;
 288
 289         drm_mm_takedown(&dev_priv->mm.stolen);
 290 }
 291
 292 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 293                                     unsigned long *base, unsigned long *size)
 294 {
 295         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 296         uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 297                                      CTG_STOLEN_RESERVED :
 298                                      ELK_STOLEN_RESERVED);
 299         unsigned long stolen_top = dev_priv->mm.stolen_base +
 300                                    ggtt->stolen_size;
 301
 302         *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 303
 304         WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
 305
 306         /* On these platforms, the register doesn't have a size field, so the
 307          * size is the distance between the base and the top of the stolen
 308          * memory. We also have the genuine case where base is zero and there's
 309          * nothing reserved. */
 310         if (*base == 0)
 311                 *size = 0;
 312         else
 313                 *size = stolen_top - *base;
 314 }
 315
 316 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 317                                      unsigned long *base, unsigned long *size)
 318 {
 319         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 320
 321         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 322
 323         switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
 324         case GEN6_STOLEN_RESERVED_1M:
 325                 *size = 1024 * 1024;
 326                 break;
 327         case GEN6_STOLEN_RESERVED_512K:
 328                 *size = 512 * 1024;
 329                 break;
 330         case GEN6_STOLEN_RESERVED_256K:
 331                 *size = 256 * 1024;
 332                 break;
 333         case GEN6_STOLEN_RESERVED_128K:
 334                 *size = 128 * 1024;
 335                 break;
 336         default:
 337                 *size = 1024 * 1024;
 338                 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
 339         }
 340 }
 341
 342 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 343                                      unsigned long *base, unsigned long *size)
 344 {
 345         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 346
 347         *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
 348
 349         switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
 350         case GEN7_STOLEN_RESERVED_1M:
 351                 *size = 1024 * 1024;
 352                 break;
 353         case GEN7_STOLEN_RESERVED_256K:
 354                 *size = 256 * 1024;
 355                 break;
 356         default:
 357                 *size = 1024 * 1024;
 358                 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
 359         }
 360 }
 361
 362 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
 363                                      unsigned long *base, unsigned long *size)
 364 {
 365         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 366
 367         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 368
 369         switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
 370         case GEN8_STOLEN_RESERVED_1M:
 371                 *size = 1024 * 1024;
 372                 break;
 373         case GEN8_STOLEN_RESERVED_2M:
 374                 *size = 2 * 1024 * 1024;
 375                 break;
 376         case GEN8_STOLEN_RESERVED_4M:
 377                 *size = 4 * 1024 * 1024;
 378                 break;
 379         case GEN8_STOLEN_RESERVED_8M:
 380                 *size = 8 * 1024 * 1024;
 381                 break;
 382         default:
 383                 *size = 8 * 1024 * 1024;
 384                 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
 385         }
 386 }
 387
 388 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 389                                     unsigned long *base, unsigned long *size)
 390 {
 391         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 392         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 393         unsigned long stolen_top;
 394
 395         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 396
 397         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 398
 399         /* On these platforms, the register doesn't have a size field, so the
 400          * size is the distance between the base and the top of the stolen
 401          * memory. We also have the genuine case where base is zero and there's
 402          * nothing reserved. */
 403         if (*base == 0)
 404                 *size = 0;
 405         else
 406                 *size = stolen_top - *base;
 407 }
 408
 409 int i915_gem_init_stolen(struct drm_device *dev)
 410 {
 411         struct drm_i915_private *dev_priv = to_i915(dev);
 412         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 413         unsigned long reserved_total, reserved_base = 0, reserved_size;
 414         unsigned long stolen_top;
 415
 416         mutex_init(&dev_priv->mm.stolen_lock);
 417
 418         if (intel_vgpu_active(dev_priv)) {
 419                 DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
 420                 return 0;
 421         }
 422
 423         if (intel_vgpu_active(dev_priv)) {
 424                 DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
 425                 return 0;
 426         }
 427
 428 #ifdef CONFIG_INTEL_IOMMU
 429         if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
 430                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 431                 return 0;
 432         }
 433 #endif
 434
 435         if (ggtt->stolen_size == 0)
 436                 return 0;
 437
 438         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
 439         if (dev_priv->mm.stolen_base == 0)
 440                 return 0;
 441
 442         stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 443
 444         switch (INTEL_INFO(dev_priv)->gen) {
 445         case 2:
 446         case 3:
 447                 break;
 448         case 4:
 449                 if (IS_G4X(dev))
 450                         g4x_get_stolen_reserved(dev_priv, &reserved_base,
 451                                                 &reserved_size);
 452                 break;
 453         case 5:
 454                 /* Assume the gen6 maximum for the older platforms. */
 455                 reserved_size = 1024 * 1024;
 456                 reserved_base = stolen_top - reserved_size;
 457                 break;
 458         case 6:
 459                 gen6_get_stolen_reserved(dev_priv, &reserved_base,
 460                                          &reserved_size);
 461                 break;
 462         case 7:
 463                 gen7_get_stolen_reserved(dev_priv, &reserved_base,
 464                                          &reserved_size);
 465                 break;
 466         default:
 467                 if (IS_BROADWELL(dev_priv) ||
 468                     IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev))
 469                         bdw_get_stolen_reserved(dev_priv, &reserved_base,
 470                                                 &reserved_size);
 471                 else
 472                         gen8_get_stolen_reserved(dev_priv, &reserved_base,
 473                                                  &reserved_size);
 474                 break;
 475         }
 476
 477         /* It is possible for the reserved base to be zero, but the register
 478          * field for size doesn't have a zero option. */
 479         if (reserved_base == 0) {
 480                 reserved_size = 0;
 481                 reserved_base = stolen_top;
 482         }
 483
 484         if (reserved_base < dev_priv->mm.stolen_base ||
 485             reserved_base + reserved_size > stolen_top) {
 486                 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
 487                               reserved_base, reserved_base + reserved_size,
 488                               dev_priv->mm.stolen_base, stolen_top);
 489                 return 0;
 490         }
 491
 492         ggtt->stolen_reserved_base = reserved_base;
 493         ggtt->stolen_reserved_size = reserved_size;
 494
 495         /* It is possible for the reserved area to end before the end of stolen
 496          * memory, so just consider the start. */
 497         reserved_total = stolen_top - reserved_base;
 498
 499         DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
 500                       ggtt->stolen_size >> 10,
 501                       (ggtt->stolen_size - reserved_total) >> 10);
 502
 503         ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total;
 504
 505         /*
 506          * Basic memrange allocator for stolen space.
 507          *
 508          * TODO: Notice that some platforms require us to not use the first page
 509          * of the stolen memory but their BIOSes may still put the framebuffer
 510          * on the first page. So we don't reserve this page for now because of
 511          * that. Our current solution is to just prevent new nodes from being
 512          * inserted on the first page - see the check we have at
 513          * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
 514          * problem later.
 515          */
 516         drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->stolen_usable_size);
 517
 518         return 0;
 519 }
 520
 521 static struct sg_table *
 522 i915_pages_create_for_stolen(struct drm_device *dev,
 523                              u32 offset, u32 size)
 524 {
 525         struct drm_i915_private *dev_priv = to_i915(dev);
 526         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 527         struct sg_table *st;
 528         struct scatterlist *sg;
 529
 530         DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
 531         BUG_ON(offset > ggtt->stolen_size - size);
 532
 533         /* We hide that we have no struct page backing our stolen object
 534          * by wrapping the contiguous physical allocation with a fake
 535          * dma mapping in a single scatterlist.
 536          */
 537
 538         st = kmalloc(sizeof(*st), GFP_KERNEL);
 539         if (st == NULL)
 540                 return NULL;
 541
 542         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 543                 kfree(st);
 544                 return NULL;
 545         }
 546
 547         sg = st->sgl;
 548         sg->offset = 0;
 549         sg->length = size;
 550
 551         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 552         sg_dma_len(sg) = size;
 553
 554         return st;
 555 }
 556
 557 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 558 {
 559         BUG();
 560         return -EINVAL;
 561 }
 562
 563 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
 564 {
 565         /* Should only be called during free */
 566         sg_free_table(obj->pages);
 567         kfree(obj->pages);
 568 }
 569
 570
 571 static void
 572 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 573 {
 574         struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
 575
 576         if (obj->stolen) {
 577                 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
 578                 kfree(obj->stolen);
 579                 obj->stolen = NULL;
 580         }
 581 }
 582 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 583         .get_pages = i915_gem_object_get_pages_stolen,
 584         .put_pages = i915_gem_object_put_pages_stolen,
 585         .release = i915_gem_object_release_stolen,
 586 };
 587
 588 static struct drm_i915_gem_object *
 589 _i915_gem_object_create_stolen(struct drm_device *dev,
 590                                struct drm_mm_node *stolen)
 591 {
 592         struct drm_i915_gem_object *obj;
 593
 594         obj = i915_gem_object_alloc(dev);
 595         if (obj == NULL)
 596                 return NULL;
 597
 598         drm_gem_private_object_init(dev, &obj->base, stolen->size);
 599         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 600
 601         obj->pages = i915_pages_create_for_stolen(dev,
 602                                                   stolen->start, stolen->size);
 603         if (obj->pages == NULL)
 604                 goto cleanup;
 605
 606         obj->get_page.sg = obj->pages->sgl;
 607         obj->get_page.last = 0;
 608
 609         i915_gem_object_pin_pages(obj);
 610         obj->stolen = stolen;
 611
 612         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 613         obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
 614
 615         return obj;
 616
 617 cleanup:
 618         i915_gem_object_free(obj);
 619         return NULL;
 620 }
 621
 622 struct drm_i915_gem_object *
 623 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
 624 {
 625         struct drm_i915_private *dev_priv = to_i915(dev);
 626         struct drm_i915_gem_object *obj;
 627         struct drm_mm_node *stolen;
 628         int ret;
 629
 630         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 631                 return NULL;
 632
 633         DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
 634         if (size == 0)
 635                 return NULL;
 636
 637         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 638         if (!stolen)
 639                 return NULL;
 640
 641         ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
 642         if (ret) {
 643                 kfree(stolen);
 644                 return NULL;
 645         }
 646
 647         obj = _i915_gem_object_create_stolen(dev, stolen);
 648         if (obj)
 649                 return obj;
 650
 651         i915_gem_stolen_remove_node(dev_priv, stolen);
 652         kfree(stolen);
 653         return NULL;
 654 }
 655
 656 struct drm_i915_gem_object *
 657 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 658                                                u32 stolen_offset,
 659                                                u32 gtt_offset,
 660                                                u32 size)
 661 {
 662         struct drm_i915_private *dev_priv = to_i915(dev);
 663         struct i915_ggtt *ggtt = &dev_priv->ggtt;
 664         struct drm_i915_gem_object *obj;
 665         struct drm_mm_node *stolen;
 666         struct i915_vma *vma;
 667         int ret;
 668
 669         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 670                 return NULL;
 671
 672         lockdep_assert_held(&dev->struct_mutex);
 673
 674         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 675                         stolen_offset, gtt_offset, size);
 676
 677         /* KISS and expect everything to be page-aligned */
 678         if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
 679             WARN_ON(stolen_offset & 4095))
 680                 return NULL;
 681
 682         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 683         if (!stolen)
 684                 return NULL;
 685
 686         stolen->start = stolen_offset;
 687         stolen->size = size;
 688         mutex_lock(&dev_priv->mm.stolen_lock);
 689         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 690         mutex_unlock(&dev_priv->mm.stolen_lock);
 691         if (ret) {
 692                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 693                 kfree(stolen);
 694                 return NULL;
 695         }
 696
 697         obj = _i915_gem_object_create_stolen(dev, stolen);
 698         if (obj == NULL) {
 699                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 700                 i915_gem_stolen_remove_node(dev_priv, stolen);
 701                 kfree(stolen);
 702                 return NULL;
 703         }
 704
 705         /* Some objects just need physical mem from stolen space */
 706         if (gtt_offset == I915_GTT_OFFSET_NONE)
 707                 return obj;
 708
 709         vma = i915_gem_obj_lookup_or_create_vma(obj, &ggtt->base, NULL);
 710         if (IS_ERR(vma)) {
 711                 ret = PTR_ERR(vma);
 712                 goto err;
 713         }
 714
 715         /* To simplify the initialisation sequence between KMS and GTT,
 716          * we allow construction of the stolen object prior to
 717          * setting up the GTT space. The actual reservation will occur
 718          * later.
 719          */
 720         vma->node.start = gtt_offset;
 721         vma->node.size = size;
 722
 723         ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node);
 724         if (ret) {
 725                 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 726                 goto err;
 727         }
 728
 729         vma->pages = obj->pages;
 730         vma->flags |= I915_VMA_GLOBAL_BIND;
 731         __i915_vma_set_map_and_fenceable(vma);
 732         list_move_tail(&vma->vm_link, &ggtt->base.inactive_list);
 733         obj->bind_count++;
 734
 735         list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
 736         i915_gem_object_pin_pages(obj);
 737
 738         return obj;
 739
 740 err:
 741         i915_gem_object_put(obj);
 742         return NULL;
 743 }