1 /* 2 * Copyright © 2008-2012 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Authors: 24 * Eric Anholt <eric@anholt.net> 25 * Chris Wilson <chris@chris-wilson.co.uk> 26 * 27 */ 28 29 #include <drm/drmP.h> 30 #include <drm/i915_drm.h> 31 #include "i915_drv.h" 32 33 #define KB(x) ((x) * 1024) 34 #define MB(x) (KB(x) * 1024) 35 36 /* 37 * The BIOS typically reserves some of the system's memory for the exclusive 38 * use of the integrated graphics. This memory is no longer available for 39 * use by the OS and so the user finds that his system has less memory 40 * available than he put in. We refer to this memory as stolen. 41 * 42 * The BIOS will allocate its framebuffer from the stolen memory. Our 43 * goal is try to reuse that object for our own fbcon which must always 44 * be available for panics. Anything else we can reuse the stolen memory 45 * for is a boon. 46 */ 47 48 int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv, 49 struct drm_mm_node *node, u64 size, 50 unsigned alignment, u64 start, u64 end) 51 { 52 int ret; 53 54 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 55 return -ENODEV; 56 57 mutex_lock(&dev_priv->mm.stolen_lock); 58 ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, 59 size, alignment, 0, 60 start, end, DRM_MM_INSERT_BEST); 61 mutex_unlock(&dev_priv->mm.stolen_lock); 62 63 return ret; 64 } 65 66 int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv, 67 struct drm_mm_node *node, u64 size, 68 unsigned alignment) 69 { 70 return i915_gem_stolen_insert_node_in_range(dev_priv, node, size, 71 alignment, 0, U64_MAX); 72 } 73 74 void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv, 75 struct drm_mm_node *node) 76 { 77 mutex_lock(&dev_priv->mm.stolen_lock); 78 drm_mm_remove_node(node); 79 mutex_unlock(&dev_priv->mm.stolen_lock); 80 } 81 82 #ifdef __DragonFly__ 83 static 84 struct resource * devm_request_mem_region(struct device *dev, 85 resource_size_t start, resource_size_t n, const char *name) 86 { 87 static struct rman stolen_rman; 88 struct resource *res; 89 90 stolen_rman.rm_start = start; 91 stolen_rman.rm_end = start + n; 92 stolen_rman.rm_type = RMAN_ARRAY; 93 stolen_rman.rm_descr = name; 94 if (rman_init(&stolen_rman, -1)) 95 return NULL; 96 97 if (rman_manage_region(&stolen_rman, stolen_rman.rm_start, stolen_rman.rm_end)) 98 return NULL; 99 100 res = kmalloc(sizeof(*res), M_DRM, GFP_KERNEL); 101 return res; 102 } 103 #endif /* __DragonFly__ */ 104 105 static dma_addr_t i915_stolen_to_dma(struct drm_i915_private *dev_priv) 106 { 107 struct pci_dev *pdev = dev_priv->drm.pdev; 108 struct i915_ggtt *ggtt = &dev_priv->ggtt; 109 struct resource *r; 110 dma_addr_t base; 111 112 /* Almost universally we can find the Graphics Base of Stolen Memory 113 * at register BSM (0x5c) in the igfx configuration space. On a few 114 * (desktop) machines this is also mirrored in the bridge device at 115 * different locations, or in the MCHBAR. 116 * 117 * On 865 we just check the TOUD register. 118 * 119 * On 830/845/85x the stolen memory base isn't available in any 120 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size. 121 * 122 */ 123 base = 0; 124 if (INTEL_GEN(dev_priv) >= 3) { 125 u32 bsm; 126 127 pci_read_config_dword(pdev, INTEL_BSM, &bsm); 128 129 base = bsm & INTEL_BSM_MASK; 130 } else if (IS_I865G(dev_priv)) { 131 u32 tseg_size = 0; 132 u16 toud = 0; 133 u8 tmp; 134 135 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0), 136 I845_ESMRAMC, &tmp); 137 138 if (tmp & TSEG_ENABLE) { 139 switch (tmp & I845_TSEG_SIZE_MASK) { 140 case I845_TSEG_SIZE_512K: 141 tseg_size = KB(512); 142 break; 143 case I845_TSEG_SIZE_1M: 144 tseg_size = MB(1); 145 break; 146 } 147 } 148 149 pci_bus_read_config_word(pdev->bus, PCI_DEVFN(0, 0), 150 I865_TOUD, &toud); 151 152 base = (toud << 16) + tseg_size; 153 } else if (IS_I85X(dev_priv)) { 154 u32 tseg_size = 0; 155 u32 tom; 156 u8 tmp; 157 158 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0), 159 I85X_ESMRAMC, &tmp); 160 161 if (tmp & TSEG_ENABLE) 162 tseg_size = MB(1); 163 164 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 1), 165 I85X_DRB3, &tmp); 166 tom = tmp * MB(32); 167 168 base = tom - tseg_size - ggtt->stolen_size; 169 } else if (IS_I845G(dev_priv)) { 170 u32 tseg_size = 0; 171 u32 tom; 172 u8 tmp; 173 174 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0), 175 I845_ESMRAMC, &tmp); 176 177 if (tmp & TSEG_ENABLE) { 178 switch (tmp & I845_TSEG_SIZE_MASK) { 179 case I845_TSEG_SIZE_512K: 180 tseg_size = KB(512); 181 break; 182 case I845_TSEG_SIZE_1M: 183 tseg_size = MB(1); 184 break; 185 } 186 } 187 188 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0), 189 I830_DRB3, &tmp); 190 tom = tmp * MB(32); 191 192 base = tom - tseg_size - ggtt->stolen_size; 193 } else if (IS_I830(dev_priv)) { 194 u32 tseg_size = 0; 195 u32 tom; 196 u8 tmp; 197 198 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0), 199 I830_ESMRAMC, &tmp); 200 201 if (tmp & TSEG_ENABLE) { 202 if (tmp & I830_TSEG_SIZE_1M) 203 tseg_size = MB(1); 204 else 205 tseg_size = KB(512); 206 } 207 208 pci_bus_read_config_byte(pdev->bus, PCI_DEVFN(0, 0), 209 I830_DRB3, &tmp); 210 tom = tmp * MB(32); 211 212 base = tom - tseg_size - ggtt->stolen_size; 213 } 214 215 if (base == 0 || add_overflows(base, ggtt->stolen_size)) 216 return 0; 217 218 /* make sure we don't clobber the GTT if it's within stolen memory */ 219 if (INTEL_GEN(dev_priv) <= 4 && 220 !IS_G33(dev_priv) && !IS_PINEVIEW(dev_priv) && !IS_G4X(dev_priv)) { 221 struct { 222 dma_addr_t start, end; 223 } stolen[2] = { 224 { .start = base, .end = base + ggtt->stolen_size, }, 225 { .start = base, .end = base + ggtt->stolen_size, }, 226 }; 227 u64 ggtt_start, ggtt_end; 228 229 ggtt_start = I915_READ(PGTBL_CTL); 230 if (IS_GEN4(dev_priv)) 231 ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) | 232 (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28; 233 else 234 ggtt_start &= PGTBL_ADDRESS_LO_MASK; 235 ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4; 236 237 if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end) 238 stolen[0].end = ggtt_start; 239 if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end) 240 stolen[1].start = ggtt_end; 241 242 /* pick the larger of the two chunks */ 243 if (stolen[0].end - stolen[0].start > 244 stolen[1].end - stolen[1].start) { 245 base = stolen[0].start; 246 ggtt->stolen_size = stolen[0].end - stolen[0].start; 247 } else { 248 base = stolen[1].start; 249 ggtt->stolen_size = stolen[1].end - stolen[1].start; 250 } 251 252 if (stolen[0].start != stolen[1].start || 253 stolen[0].end != stolen[1].end) { 254 dma_addr_t end = base + ggtt->stolen_size - 1; 255 256 DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n", 257 (unsigned long long)ggtt_start, 258 (unsigned long long)ggtt_end - 1); 259 DRM_DEBUG_KMS("Stolen memory adjusted to %pad - %pad\n", 260 &base, &end); 261 } 262 } 263 264 265 /* Verify that nothing else uses this physical address. Stolen 266 * memory should be reserved by the BIOS and hidden from the 267 * kernel. So if the region is already marked as busy, something 268 * is seriously wrong. 269 */ 270 r = devm_request_mem_region(dev_priv->drm.dev, base, ggtt->stolen_size, 271 "Graphics Stolen Memory"); 272 if (r == NULL) { 273 /* 274 * One more attempt but this time requesting region from 275 * base + 1, as we have seen that this resolves the region 276 * conflict with the PCI Bus. 277 * This is a BIOS w/a: Some BIOS wrap stolen in the root 278 * PCI bus, but have an off-by-one error. Hence retry the 279 * reservation starting from 1 instead of 0. 280 * There's also BIOS with off-by-one on the other end. 281 */ 282 r = devm_request_mem_region(dev_priv->drm.dev, base + 1, 283 ggtt->stolen_size - 2, 284 "Graphics Stolen Memory"); 285 /* 286 * GEN3 firmware likes to smash pci bridges into the stolen 287 * range. Apparently this works. 288 */ 289 if (r == NULL && !IS_GEN3(dev_priv)) { 290 dma_addr_t end = base + ggtt->stolen_size; 291 292 DRM_ERROR("conflict detected with stolen region: [%pad - %pad]\n", 293 &base, &end); 294 base = 0; 295 } 296 } 297 298 return base; 299 } 300 301 void i915_gem_cleanup_stolen(struct drm_device *dev) 302 { 303 struct drm_i915_private *dev_priv = to_i915(dev); 304 305 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 306 return; 307 308 drm_mm_takedown(&dev_priv->mm.stolen); 309 } 310 311 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv, 312 dma_addr_t *base, u32 *size) 313 { 314 struct i915_ggtt *ggtt = &dev_priv->ggtt; 315 uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ? 316 CTG_STOLEN_RESERVED : 317 ELK_STOLEN_RESERVED); 318 dma_addr_t stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size; 319 320 *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16; 321 322 WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base); 323 324 /* On these platforms, the register doesn't have a size field, so the 325 * size is the distance between the base and the top of the stolen 326 * memory. We also have the genuine case where base is zero and there's 327 * nothing reserved. */ 328 if (*base == 0) 329 *size = 0; 330 else 331 *size = stolen_top - *base; 332 } 333 334 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv, 335 dma_addr_t *base, u32 *size) 336 { 337 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); 338 339 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 340 341 switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) { 342 case GEN6_STOLEN_RESERVED_1M: 343 *size = 1024 * 1024; 344 break; 345 case GEN6_STOLEN_RESERVED_512K: 346 *size = 512 * 1024; 347 break; 348 case GEN6_STOLEN_RESERVED_256K: 349 *size = 256 * 1024; 350 break; 351 case GEN6_STOLEN_RESERVED_128K: 352 *size = 128 * 1024; 353 break; 354 default: 355 *size = 1024 * 1024; 356 MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK); 357 } 358 } 359 360 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv, 361 dma_addr_t *base, u32 *size) 362 { 363 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); 364 365 *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK; 366 367 switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { 368 case GEN7_STOLEN_RESERVED_1M: 369 *size = 1024 * 1024; 370 break; 371 case GEN7_STOLEN_RESERVED_256K: 372 *size = 256 * 1024; 373 break; 374 default: 375 *size = 1024 * 1024; 376 MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); 377 } 378 } 379 380 static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv, 381 dma_addr_t *base, u32 *size) 382 { 383 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); 384 385 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 386 387 switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { 388 case GEN8_STOLEN_RESERVED_1M: 389 *size = 1024 * 1024; 390 break; 391 case GEN8_STOLEN_RESERVED_2M: 392 *size = 2 * 1024 * 1024; 393 break; 394 case GEN8_STOLEN_RESERVED_4M: 395 *size = 4 * 1024 * 1024; 396 break; 397 case GEN8_STOLEN_RESERVED_8M: 398 *size = 8 * 1024 * 1024; 399 break; 400 default: 401 *size = 8 * 1024 * 1024; 402 MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); 403 } 404 } 405 406 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv, 407 dma_addr_t *base, u32 *size) 408 { 409 struct i915_ggtt *ggtt = &dev_priv->ggtt; 410 uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); 411 dma_addr_t stolen_top; 412 413 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size; 414 415 *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; 416 417 /* On these platforms, the register doesn't have a size field, so the 418 * size is the distance between the base and the top of the stolen 419 * memory. We also have the genuine case where base is zero and there's 420 * nothing reserved. */ 421 if (*base == 0) 422 *size = 0; 423 else 424 *size = stolen_top - *base; 425 } 426 427 int i915_gem_init_stolen(struct drm_i915_private *dev_priv) 428 { 429 struct i915_ggtt *ggtt = &dev_priv->ggtt; 430 dma_addr_t reserved_base, stolen_top; 431 u32 reserved_total, reserved_size; 432 u32 stolen_usable_start; 433 434 lockinit(&dev_priv->mm.stolen_lock, "i915msl", 0, LK_CANRECURSE); 435 436 if (intel_vgpu_active(dev_priv)) { 437 DRM_INFO("iGVT-g active, disabling use of stolen memory\n"); 438 return 0; 439 } 440 441 if (intel_vtd_active() && INTEL_GEN(dev_priv) < 8) { 442 DRM_INFO("DMAR active, disabling use of stolen memory\n"); 443 return 0; 444 } 445 446 if (ggtt->stolen_size == 0) 447 return 0; 448 449 dev_priv->mm.stolen_base = i915_stolen_to_dma(dev_priv); 450 if (dev_priv->mm.stolen_base == 0) 451 return 0; 452 453 stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size; 454 reserved_base = 0; 455 reserved_size = 0; 456 457 switch (INTEL_INFO(dev_priv)->gen) { 458 case 2: 459 case 3: 460 break; 461 case 4: 462 if (IS_G4X(dev_priv)) 463 g4x_get_stolen_reserved(dev_priv, 464 &reserved_base, &reserved_size); 465 break; 466 case 5: 467 /* Assume the gen6 maximum for the older platforms. */ 468 reserved_size = 1024 * 1024; 469 reserved_base = stolen_top - reserved_size; 470 break; 471 case 6: 472 gen6_get_stolen_reserved(dev_priv, 473 &reserved_base, &reserved_size); 474 break; 475 case 7: 476 gen7_get_stolen_reserved(dev_priv, 477 &reserved_base, &reserved_size); 478 break; 479 default: 480 if (IS_LP(dev_priv)) 481 chv_get_stolen_reserved(dev_priv, 482 &reserved_base, &reserved_size); 483 else 484 bdw_get_stolen_reserved(dev_priv, 485 &reserved_base, &reserved_size); 486 break; 487 } 488 489 /* It is possible for the reserved base to be zero, but the register 490 * field for size doesn't have a zero option. */ 491 if (reserved_base == 0) { 492 reserved_size = 0; 493 reserved_base = stolen_top; 494 } 495 496 if (reserved_base < dev_priv->mm.stolen_base || 497 reserved_base + reserved_size > stolen_top) { 498 dma_addr_t reserved_top = reserved_base + reserved_size; 499 DRM_DEBUG_KMS("Stolen reserved area [%pad - %pad] outside stolen memory [%pad - %pad]\n", 500 &reserved_base, &reserved_top, 501 &dev_priv->mm.stolen_base, &stolen_top); 502 return 0; 503 } 504 505 ggtt->stolen_reserved_base = reserved_base; 506 ggtt->stolen_reserved_size = reserved_size; 507 508 /* It is possible for the reserved area to end before the end of stolen 509 * memory, so just consider the start. */ 510 reserved_total = stolen_top - reserved_base; 511 512 DRM_DEBUG_KMS("Memory reserved for graphics device: %uK, usable: %uK\n", 513 ggtt->stolen_size >> 10, 514 (ggtt->stolen_size - reserved_total) >> 10); 515 516 stolen_usable_start = 0; 517 /* WaSkipStolenMemoryFirstPage:bdw+ */ 518 if (INTEL_GEN(dev_priv) >= 8) 519 stolen_usable_start = 4096; 520 521 ggtt->stolen_usable_size = 522 ggtt->stolen_size - reserved_total - stolen_usable_start; 523 524 /* Basic memrange allocator for stolen space. */ 525 drm_mm_init(&dev_priv->mm.stolen, stolen_usable_start, 526 ggtt->stolen_usable_size); 527 528 return 0; 529 } 530 531 static struct sg_table * 532 i915_pages_create_for_stolen(struct drm_device *dev, 533 u32 offset, u32 size) 534 { 535 struct drm_i915_private *dev_priv = to_i915(dev); 536 struct sg_table *st; 537 struct scatterlist *sg; 538 539 GEM_BUG_ON(range_overflows(offset, size, dev_priv->ggtt.stolen_size)); 540 541 /* We hide that we have no struct page backing our stolen object 542 * by wrapping the contiguous physical allocation with a fake 543 * dma mapping in a single scatterlist. 544 */ 545 546 st = kmalloc(sizeof(*st), M_DRM, GFP_KERNEL); 547 if (st == NULL) 548 return ERR_PTR(-ENOMEM); 549 550 if (sg_alloc_table(st, 1, GFP_KERNEL)) { 551 kfree(st); 552 return ERR_PTR(-ENOMEM); 553 } 554 555 sg = st->sgl; 556 sg->offset = 0; 557 sg->length = size; 558 559 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; 560 sg_dma_len(sg) = size; 561 562 return st; 563 } 564 565 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) 566 { 567 struct sg_table *pages = 568 i915_pages_create_for_stolen(obj->base.dev, 569 obj->stolen->start, 570 obj->stolen->size); 571 if (IS_ERR(pages)) 572 return PTR_ERR(pages); 573 574 __i915_gem_object_set_pages(obj, pages, obj->stolen->size); 575 576 return 0; 577 } 578 579 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj, 580 struct sg_table *pages) 581 { 582 /* Should only be called from i915_gem_object_release_stolen() */ 583 sg_free_table(pages); 584 kfree(pages); 585 } 586 587 static void 588 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) 589 { 590 struct drm_i915_private *dev_priv = to_i915(obj->base.dev); 591 struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen); 592 593 GEM_BUG_ON(!stolen); 594 595 __i915_gem_object_unpin_pages(obj); 596 597 i915_gem_stolen_remove_node(dev_priv, stolen); 598 kfree(stolen); 599 } 600 601 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { 602 .get_pages = i915_gem_object_get_pages_stolen, 603 .put_pages = i915_gem_object_put_pages_stolen, 604 .release = i915_gem_object_release_stolen, 605 }; 606 607 static struct drm_i915_gem_object * 608 _i915_gem_object_create_stolen(struct drm_i915_private *dev_priv, 609 struct drm_mm_node *stolen) 610 { 611 struct drm_i915_gem_object *obj; 612 unsigned int cache_level; 613 614 obj = i915_gem_object_alloc(dev_priv); 615 if (obj == NULL) 616 return NULL; 617 618 drm_gem_private_object_init(&dev_priv->drm, &obj->base, stolen->size); 619 i915_gem_object_init(obj, &i915_gem_object_stolen_ops); 620 621 obj->stolen = stolen; 622 obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; 623 cache_level = HAS_LLC(dev_priv) ? I915_CACHE_LLC : I915_CACHE_NONE; 624 i915_gem_object_set_cache_coherency(obj, cache_level); 625 626 if (i915_gem_object_pin_pages(obj)) 627 goto cleanup; 628 629 return obj; 630 631 cleanup: 632 i915_gem_object_free(obj); 633 return NULL; 634 } 635 636 struct drm_i915_gem_object * 637 i915_gem_object_create_stolen(struct drm_i915_private *dev_priv, u32 size) 638 { 639 struct drm_i915_gem_object *obj; 640 struct drm_mm_node *stolen; 641 int ret; 642 643 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 644 return NULL; 645 646 if (size == 0) 647 return NULL; 648 649 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 650 if (!stolen) 651 return NULL; 652 653 ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096); 654 if (ret) { 655 kfree(stolen); 656 return NULL; 657 } 658 659 obj = _i915_gem_object_create_stolen(dev_priv, stolen); 660 if (obj) 661 return obj; 662 663 i915_gem_stolen_remove_node(dev_priv, stolen); 664 kfree(stolen); 665 return NULL; 666 } 667 668 struct drm_i915_gem_object * 669 i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv, 670 u32 stolen_offset, 671 u32 gtt_offset, 672 u32 size) 673 { 674 struct i915_ggtt *ggtt = &dev_priv->ggtt; 675 struct drm_i915_gem_object *obj; 676 struct drm_mm_node *stolen; 677 struct i915_vma *vma; 678 int ret; 679 680 if (!drm_mm_initialized(&dev_priv->mm.stolen)) 681 return NULL; 682 683 lockdep_assert_held(&dev_priv->drm.struct_mutex); 684 685 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", 686 stolen_offset, gtt_offset, size); 687 688 /* KISS and expect everything to be page-aligned */ 689 if (WARN_ON(size == 0) || 690 WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) || 691 WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT))) 692 return NULL; 693 694 stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); 695 if (!stolen) 696 return NULL; 697 698 stolen->start = stolen_offset; 699 stolen->size = size; 700 mutex_lock(&dev_priv->mm.stolen_lock); 701 ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen); 702 mutex_unlock(&dev_priv->mm.stolen_lock); 703 if (ret) { 704 DRM_DEBUG_KMS("failed to allocate stolen space\n"); 705 kfree(stolen); 706 return NULL; 707 } 708 709 obj = _i915_gem_object_create_stolen(dev_priv, stolen); 710 if (obj == NULL) { 711 DRM_DEBUG_KMS("failed to allocate stolen object\n"); 712 i915_gem_stolen_remove_node(dev_priv, stolen); 713 kfree(stolen); 714 return NULL; 715 } 716 717 /* Some objects just need physical mem from stolen space */ 718 if (gtt_offset == I915_GTT_OFFSET_NONE) 719 return obj; 720 721 ret = i915_gem_object_pin_pages(obj); 722 if (ret) 723 goto err; 724 725 vma = i915_vma_instance(obj, &ggtt->base, NULL); 726 if (IS_ERR(vma)) { 727 ret = PTR_ERR(vma); 728 goto err_pages; 729 } 730 731 /* To simplify the initialisation sequence between KMS and GTT, 732 * we allow construction of the stolen object prior to 733 * setting up the GTT space. The actual reservation will occur 734 * later. 735 */ 736 ret = i915_gem_gtt_reserve(&ggtt->base, &vma->node, 737 size, gtt_offset, obj->cache_level, 738 0); 739 if (ret) { 740 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); 741 goto err_pages; 742 } 743 744 GEM_BUG_ON(!drm_mm_node_allocated(&vma->node)); 745 746 vma->pages = obj->mm.pages; 747 vma->flags |= I915_VMA_GLOBAL_BIND; 748 __i915_vma_set_map_and_fenceable(vma); 749 list_move_tail(&vma->vm_link, &ggtt->base.inactive_list); 750 751 lockmgr(&dev_priv->mm.obj_lock, LK_EXCLUSIVE); 752 list_move_tail(&obj->mm.link, &dev_priv->mm.bound_list); 753 obj->bind_count++; 754 lockmgr(&dev_priv->mm.obj_lock, LK_RELEASE); 755 756 return obj; 757 758 err_pages: 759 i915_gem_object_unpin_pages(obj); 760 err: 761 i915_gem_object_put(obj); 762 return NULL; 763 } 764