kernel/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         return i915_gem_stolen_insert_node_in_range(dev_priv, node, size,
  76                                         alignment, 0,
  77                                         dev_priv->gtt.stolen_usable_size);
  78 }
  79
  80 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv,
  81                                  struct drm_mm_node *node)
  82 {
  83         mutex_lock(&dev_priv->mm.stolen_lock);
  84         drm_mm_remove_node(node);
  85         mutex_unlock(&dev_priv->mm.stolen_lock);
  86 }
  87
  88 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
  89 {
  90         struct drm_i915_private *dev_priv = dev->dev_private;
  91         struct resource *r;
  92         u32 base;
  93
  94         /* Almost universally we can find the Graphics Base of Stolen Memory
  95          * at offset 0x5c in the igfx configuration space. On a few (desktop)
  96          * machines this is also mirrored in the bridge device at different
  97          * locations, or in the MCHBAR.
  98          *
  99          * On 865 we just check the TOUD register.
 100          *
 101          * On 830/845/85x the stolen memory base isn't available in any
 102          * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
 103          *
 104          */
 105         base = 0;
 106         if (INTEL_INFO(dev)->gen >= 3) {
 107                 /* Read Graphics Base of Stolen Memory directly */
 108                 pci_read_config_dword(dev->pdev, 0x5c, &base);
 109                 base &= ~((1<<20) - 1);
 110         } else if (IS_I865G(dev)) {
 111                 u16 toud = 0;
 112
 113                 /*
 114                  * FIXME is the graphics stolen memory region
 115                  * always at TOUD? Ie. is it always the last
 116                  * one to be allocated by the BIOS?
 117                  */
 118                 pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0),
 119                                          I865_TOUD, &toud);
 120
 121                 base = toud << 16;
 122         } else if (IS_I85X(dev)) {
 123                 u32 tseg_size = 0;
 124                 u32 tom;
 125                 u8 tmp;
 126
 127                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 128                                          I85X_ESMRAMC, &tmp);
 129
 130                 if (tmp & TSEG_ENABLE)
 131                         tseg_size = MB(1);
 132
 133                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1),
 134                                          I85X_DRB3, &tmp);
 135                 tom = tmp * MB(32);
 136
 137                 base = tom - tseg_size - dev_priv->gtt.stolen_size;
 138         } else if (IS_845G(dev)) {
 139                 u32 tseg_size = 0;
 140                 u32 tom;
 141                 u8 tmp;
 142
 143                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 144                                          I845_ESMRAMC, &tmp);
 145
 146                 if (tmp & TSEG_ENABLE) {
 147                         switch (tmp & I845_TSEG_SIZE_MASK) {
 148                         case I845_TSEG_SIZE_512K:
 149                                 tseg_size = KB(512);
 150                                 break;
 151                         case I845_TSEG_SIZE_1M:
 152                                 tseg_size = MB(1);
 153                                 break;
 154                         }
 155                 }
 156
 157                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 158                                          I830_DRB3, &tmp);
 159                 tom = tmp * MB(32);
 160
 161                 base = tom - tseg_size - dev_priv->gtt.stolen_size;
 162         } else if (IS_I830(dev)) {
 163                 u32 tseg_size = 0;
 164                 u32 tom;
 165                 u8 tmp;
 166
 167                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 168                                          I830_ESMRAMC, &tmp);
 169
 170                 if (tmp & TSEG_ENABLE) {
 171                         if (tmp & I830_TSEG_SIZE_1M)
 172                                 tseg_size = MB(1);
 173                         else
 174                                 tseg_size = KB(512);
 175                 }
 176
 177                 pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0),
 178                                          I830_DRB3, &tmp);
 179                 tom = tmp * MB(32);
 180
 181                 base = tom - tseg_size - dev_priv->gtt.stolen_size;
 182         }
 183
 184         if (base == 0)
 185                 return 0;
 186
 187         /* make sure we don't clobber the GTT if it's within stolen memory */
 188         if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) {
 189                 struct {
 190                         u32 start, end;
 191                 } stolen[2] = {
 192                         { .start = base, .end = base + dev_priv->gtt.stolen_size, },
 193                         { .start = base, .end = base + dev_priv->gtt.stolen_size, },
 194                 };
 195                 u64 gtt_start, gtt_end;
 196
 197                 gtt_start = I915_READ(PGTBL_CTL);
 198                 if (IS_GEN4(dev))
 199                         gtt_start = (gtt_start & PGTBL_ADDRESS_LO_MASK) |
 200                                 (gtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
 201                 else
 202                         gtt_start &= PGTBL_ADDRESS_LO_MASK;
 203                 gtt_end = gtt_start + gtt_total_entries(dev_priv->gtt) * 4;
 204
 205                 if (gtt_start >= stolen[0].start && gtt_start < stolen[0].end)
 206                         stolen[0].end = gtt_start;
 207                 if (gtt_end > stolen[1].start && gtt_end <= stolen[1].end)
 208                         stolen[1].start = gtt_end;
 209
 210                 /* pick the larger of the two chunks */
 211                 if (stolen[0].end - stolen[0].start >
 212                     stolen[1].end - stolen[1].start) {
 213                         base = stolen[0].start;
 214                         dev_priv->gtt.stolen_size = stolen[0].end - stolen[0].start;
 215                 } else {
 216                         base = stolen[1].start;
 217                         dev_priv->gtt.stolen_size = stolen[1].end - stolen[1].start;
 218                 }
 219
 220                 if (stolen[0].start != stolen[1].start ||
 221                     stolen[0].end != stolen[1].end) {
 222                         DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n",
 223                                       (unsigned long long) gtt_start,
 224                                       (unsigned long long) gtt_end - 1);
 225                         DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n",
 226                                       base, base + (u32) dev_priv->gtt.stolen_size - 1);
 227                 }
 228         }
 229
 230
 231         /* Verify that nothing else uses this physical address. Stolen
 232          * memory should be reserved by the BIOS and hidden from the
 233          * kernel. So if the region is already marked as busy, something
 234          * is seriously wrong.
 235          */
 236         r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
 237                                     "Graphics Stolen Memory");
 238         if (r == NULL) {
 239                 /*
 240                  * One more attempt but this time requesting region from
 241                  * base + 1, as we have seen that this resolves the region
 242                  * conflict with the PCI Bus.
 243                  * This is a BIOS w/a: Some BIOS wrap stolen in the root
 244                  * PCI bus, but have an off-by-one error. Hence retry the
 245                  * reservation starting from 1 instead of 0.
 246                  */
 247                 r = devm_request_mem_region(dev->dev, base + 1,
 248                                             dev_priv->gtt.stolen_size - 1,
 249                                             "Graphics Stolen Memory");
 250                 /*
 251                  * GEN3 firmware likes to smash pci bridges into the stolen
 252                  * range. Apparently this works.
 253                  */
 254                 if (r == NULL && !IS_GEN3(dev)) {
 255                         DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
 256                                   base, base + (uint32_t)dev_priv->gtt.stolen_size);
 257                         base = 0;
 258                 }
 259         }
 260
 261         return base;
 262 }
 263
 264 void i915_gem_cleanup_stolen(struct drm_device *dev)
 265 {
 266         struct drm_i915_private *dev_priv = dev->dev_private;
 267
 268         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 269                 return;
 270
 271         drm_mm_takedown(&dev_priv->mm.stolen);
 272 }
 273
 274 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 275                                     unsigned long *base, unsigned long *size)
 276 {
 277         uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 278                                      CTG_STOLEN_RESERVED :
 279                                      ELK_STOLEN_RESERVED);
 280         unsigned long stolen_top = dev_priv->mm.stolen_base +
 281                 dev_priv->gtt.stolen_size;
 282
 283         *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 284
 285         WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
 286
 287         /* On these platforms, the register doesn't have a size field, so the
 288          * size is the distance between the base and the top of the stolen
 289          * memory. We also have the genuine case where base is zero and there's
 290          * nothing reserved. */
 291         if (*base == 0)
 292                 *size = 0;
 293         else
 294                 *size = stolen_top - *base;
 295 }
 296
 297 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 298                                      unsigned long *base, unsigned long *size)
 299 {
 300         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 301
 302         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 303
 304         switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
 305         case GEN6_STOLEN_RESERVED_1M:
 306                 *size = 1024 * 1024;
 307                 break;
 308         case GEN6_STOLEN_RESERVED_512K:
 309                 *size = 512 * 1024;
 310                 break;
 311         case GEN6_STOLEN_RESERVED_256K:
 312                 *size = 256 * 1024;
 313                 break;
 314         case GEN6_STOLEN_RESERVED_128K:
 315                 *size = 128 * 1024;
 316                 break;
 317         default:
 318                 *size = 1024 * 1024;
 319                 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
 320         }
 321 }
 322
 323 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 324                                      unsigned long *base, unsigned long *size)
 325 {
 326         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 327
 328         *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
 329
 330         switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
 331         case GEN7_STOLEN_RESERVED_1M:
 332                 *size = 1024 * 1024;
 333                 break;
 334         case GEN7_STOLEN_RESERVED_256K:
 335                 *size = 256 * 1024;
 336                 break;
 337         default:
 338                 *size = 1024 * 1024;
 339                 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
 340         }
 341 }
 342
 343 static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv,
 344                                      unsigned long *base, unsigned long *size)
 345 {
 346         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 347
 348         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 349
 350         switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
 351         case GEN8_STOLEN_RESERVED_1M:
 352                 *size = 1024 * 1024;
 353                 break;
 354         case GEN8_STOLEN_RESERVED_2M:
 355                 *size = 2 * 1024 * 1024;
 356                 break;
 357         case GEN8_STOLEN_RESERVED_4M:
 358                 *size = 4 * 1024 * 1024;
 359                 break;
 360         case GEN8_STOLEN_RESERVED_8M:
 361                 *size = 8 * 1024 * 1024;
 362                 break;
 363         default:
 364                 *size = 8 * 1024 * 1024;
 365                 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
 366         }
 367 }
 368
 369 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 370                                     unsigned long *base, unsigned long *size)
 371 {
 372         uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 373         unsigned long stolen_top;
 374
 375         stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
 376
 377         *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
 378
 379         /* On these platforms, the register doesn't have a size field, so the
 380          * size is the distance between the base and the top of the stolen
 381          * memory. We also have the genuine case where base is zero and there's
 382          * nothing reserved. */
 383         if (*base == 0)
 384                 *size = 0;
 385         else
 386                 *size = stolen_top - *base;
 387 }
 388
 389 int i915_gem_init_stolen(struct drm_device *dev)
 390 {
 391         struct drm_i915_private *dev_priv = dev->dev_private;
 392         unsigned long reserved_total, reserved_base = 0, reserved_size;
 393         unsigned long stolen_top;
 394
 395         mutex_init(&dev_priv->mm.stolen_lock);
 396
 397 #ifdef CONFIG_INTEL_IOMMU
 398         if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
 399                 DRM_INFO("DMAR active, disabling use of stolen memory\n");
 400                 return 0;
 401         }
 402 #endif
 403
 404         if (dev_priv->gtt.stolen_size == 0)
 405                 return 0;
 406
 407         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
 408         if (dev_priv->mm.stolen_base == 0)
 409                 return 0;
 410
 411         stolen_top = dev_priv->mm.stolen_base + dev_priv->gtt.stolen_size;
 412
 413         switch (INTEL_INFO(dev_priv)->gen) {
 414         case 2:
 415         case 3:
 416                 break;
 417         case 4:
 418                 if (IS_G4X(dev))
 419                         g4x_get_stolen_reserved(dev_priv, &reserved_base,
 420                                                 &reserved_size);
 421                 break;
 422         case 5:
 423                 /* Assume the gen6 maximum for the older platforms. */
 424                 reserved_size = 1024 * 1024;
 425                 reserved_base = stolen_top - reserved_size;
 426                 break;
 427         case 6:
 428                 gen6_get_stolen_reserved(dev_priv, &reserved_base,
 429                                          &reserved_size);
 430                 break;
 431         case 7:
 432                 gen7_get_stolen_reserved(dev_priv, &reserved_base,
 433                                          &reserved_size);
 434                 break;
 435         default:
 436                 if (IS_BROADWELL(dev_priv) || IS_SKYLAKE(dev_priv))
 437                         bdw_get_stolen_reserved(dev_priv, &reserved_base,
 438                                                 &reserved_size);
 439                 else
 440                         gen8_get_stolen_reserved(dev_priv, &reserved_base,
 441                                                  &reserved_size);
 442                 break;
 443         }
 444
 445         /* It is possible for the reserved base to be zero, but the register
 446          * field for size doesn't have a zero option. */
 447         if (reserved_base == 0) {
 448                 reserved_size = 0;
 449                 reserved_base = stolen_top;
 450         }
 451
 452         if (reserved_base < dev_priv->mm.stolen_base ||
 453             reserved_base + reserved_size > stolen_top) {
 454                 DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
 455                               reserved_base, reserved_base + reserved_size,
 456                               dev_priv->mm.stolen_base, stolen_top);
 457                 return 0;
 458         }
 459
 460         /* It is possible for the reserved area to end before the end of stolen
 461          * memory, so just consider the start. */
 462         reserved_total = stolen_top - reserved_base;
 463
 464         DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n",
 465                       dev_priv->gtt.stolen_size >> 10,
 466                       (dev_priv->gtt.stolen_size - reserved_total) >> 10);
 467
 468         dev_priv->gtt.stolen_usable_size = dev_priv->gtt.stolen_size -
 469                                            reserved_total;
 470
 471         /*
 472          * Basic memrange allocator for stolen space.
 473          *
 474          * TODO: Notice that some platforms require us to not use the first page
 475          * of the stolen memory but their BIOSes may still put the framebuffer
 476          * on the first page. So we don't reserve this page for now because of
 477          * that. Our current solution is to just prevent new nodes from being
 478          * inserted on the first page - see the check we have at
 479          * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon
 480          * problem later.
 481          */
 482         drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_usable_size);
 483
 484         return 0;
 485 }
 486
 487 static struct sg_table *
 488 i915_pages_create_for_stolen(struct drm_device *dev,
 489                              u32 offset, u32 size)
 490 {
 491         struct drm_i915_private *dev_priv = dev->dev_private;
 492         struct sg_table *st;
 493         struct scatterlist *sg;
 494
 495         DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
 496         BUG_ON(offset > dev_priv->gtt.stolen_size - size);
 497
 498         /* We hide that we have no struct page backing our stolen object
 499          * by wrapping the contiguous physical allocation with a fake
 500          * dma mapping in a single scatterlist.
 501          */
 502
 503         st = kmalloc(sizeof(*st), GFP_KERNEL);
 504         if (st == NULL)
 505                 return NULL;
 506
 507         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 508                 kfree(st);
 509                 return NULL;
 510         }
 511
 512         sg = st->sgl;
 513         sg->offset = 0;
 514         sg->length = size;
 515
 516         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 517         sg_dma_len(sg) = size;
 518
 519         return st;
 520 }
 521
 522 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 523 {
 524         BUG();
 525         return -EINVAL;
 526 }
 527
 528 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
 529 {
 530         /* Should only be called during free */
 531         sg_free_table(obj->pages);
 532         kfree(obj->pages);
 533 }
 534
 535
 536 static void
 537 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 538 {
 539         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
 540
 541         if (obj->stolen) {
 542                 i915_gem_stolen_remove_node(dev_priv, obj->stolen);
 543                 kfree(obj->stolen);
 544                 obj->stolen = NULL;
 545         }
 546 }
 547 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 548         .get_pages = i915_gem_object_get_pages_stolen,
 549         .put_pages = i915_gem_object_put_pages_stolen,
 550         .release = i915_gem_object_release_stolen,
 551 };
 552
 553 static struct drm_i915_gem_object *
 554 _i915_gem_object_create_stolen(struct drm_device *dev,
 555                                struct drm_mm_node *stolen)
 556 {
 557         struct drm_i915_gem_object *obj;
 558
 559         obj = i915_gem_object_alloc(dev);
 560         if (obj == NULL)
 561                 return NULL;
 562
 563         drm_gem_private_object_init(dev, &obj->base, stolen->size);
 564         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 565
 566         obj->pages = i915_pages_create_for_stolen(dev,
 567                                                   stolen->start, stolen->size);
 568         if (obj->pages == NULL)
 569                 goto cleanup;
 570
 571         i915_gem_object_pin_pages(obj);
 572         obj->stolen = stolen;
 573
 574         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
 575         obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
 576
 577         return obj;
 578
 579 cleanup:
 580         i915_gem_object_free(obj);
 581         return NULL;
 582 }
 583
 584 struct drm_i915_gem_object *
 585 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
 586 {
 587         struct drm_i915_private *dev_priv = dev->dev_private;
 588         struct drm_i915_gem_object *obj;
 589         struct drm_mm_node *stolen;
 590         int ret;
 591
 592         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 593                 return NULL;
 594
 595         DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
 596         if (size == 0)
 597                 return NULL;
 598
 599         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 600         if (!stolen)
 601                 return NULL;
 602
 603         ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
 604         if (ret) {
 605                 kfree(stolen);
 606                 return NULL;
 607         }
 608
 609         obj = _i915_gem_object_create_stolen(dev, stolen);
 610         if (obj)
 611                 return obj;
 612
 613         i915_gem_stolen_remove_node(dev_priv, stolen);
 614         kfree(stolen);
 615         return NULL;
 616 }
 617
 618 struct drm_i915_gem_object *
 619 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 620                                                u32 stolen_offset,
 621                                                u32 gtt_offset,
 622                                                u32 size)
 623 {
 624         struct drm_i915_private *dev_priv = dev->dev_private;
 625         struct i915_address_space *ggtt = &dev_priv->gtt.base;
 626         struct drm_i915_gem_object *obj;
 627         struct drm_mm_node *stolen;
 628         struct i915_vma *vma;
 629         int ret;
 630
 631         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 632                 return NULL;
 633
 634         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 635                         stolen_offset, gtt_offset, size);
 636
 637         /* KISS and expect everything to be page-aligned */
 638         if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
 639             WARN_ON(stolen_offset & 4095))
 640                 return NULL;
 641
 642         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
 643         if (!stolen)
 644                 return NULL;
 645
 646         stolen->start = stolen_offset;
 647         stolen->size = size;
 648         mutex_lock(&dev_priv->mm.stolen_lock);
 649         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
 650         mutex_unlock(&dev_priv->mm.stolen_lock);
 651         if (ret) {
 652                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 653                 kfree(stolen);
 654                 return NULL;
 655         }
 656
 657         obj = _i915_gem_object_create_stolen(dev, stolen);
 658         if (obj == NULL) {
 659                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 660                 i915_gem_stolen_remove_node(dev_priv, stolen);
 661                 kfree(stolen);
 662                 return NULL;
 663         }
 664
 665         /* Some objects just need physical mem from stolen space */
 666         if (gtt_offset == I915_GTT_OFFSET_NONE)
 667                 return obj;
 668
 669         vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
 670         if (IS_ERR(vma)) {
 671                 ret = PTR_ERR(vma);
 672                 goto err;
 673         }
 674
 675         /* To simplify the initialisation sequence between KMS and GTT,
 676          * we allow construction of the stolen object prior to
 677          * setting up the GTT space. The actual reservation will occur
 678          * later.
 679          */
 680         vma->node.start = gtt_offset;
 681         vma->node.size = size;
 682         if (drm_mm_initialized(&ggtt->mm)) {
 683                 ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
 684                 if (ret) {
 685                         DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 686                         goto err;
 687                 }
 688
 689                 vma->bound |= GLOBAL_BIND;
 690                 __i915_vma_set_map_and_fenceable(vma);
 691                 list_add_tail(&vma->mm_list, &ggtt->inactive_list);
 692         }
 693
 694         list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
 695         i915_gem_object_pin_pages(obj);
 696
 697         return obj;
 698
 699 err:
 700         drm_gem_object_unreference(&obj->base);
 701         return NULL;
 702 }