1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2020 Intel Corporation 4 */ 5 6 #include <linux/log2.h> 7 8 #include "gen8_ppgtt.h" 9 #include "i915_scatterlist.h" 10 #include "i915_trace.h" 11 #include "i915_pvinfo.h" 12 #include "i915_vgpu.h" 13 #include "intel_gt.h" 14 #include "intel_gtt.h" 15 16 static u64 gen8_pde_encode(const dma_addr_t addr, 17 const enum i915_cache_level level) 18 { 19 u64 pde = addr | _PAGE_PRESENT | _PAGE_RW; 20 21 if (level != I915_CACHE_NONE) 22 pde |= PPAT_CACHED_PDE; 23 else 24 pde |= PPAT_UNCACHED; 25 26 return pde; 27 } 28 29 static u64 gen8_pte_encode(dma_addr_t addr, 30 enum i915_cache_level level, 31 u32 flags) 32 { 33 gen8_pte_t pte = addr | _PAGE_PRESENT | _PAGE_RW; 34 35 if (unlikely(flags & PTE_READ_ONLY)) 36 pte &= ~_PAGE_RW; 37 38 switch (level) { 39 case I915_CACHE_NONE: 40 pte |= PPAT_UNCACHED; 41 break; 42 case I915_CACHE_WT: 43 pte |= PPAT_DISPLAY_ELLC; 44 break; 45 default: 46 pte |= PPAT_CACHED; 47 break; 48 } 49 50 return pte; 51 } 52 53 static void gen8_ppgtt_notify_vgt(struct i915_ppgtt *ppgtt, bool create) 54 { 55 struct drm_i915_private *i915 = ppgtt->vm.i915; 56 struct intel_uncore *uncore = ppgtt->vm.gt->uncore; 57 enum vgt_g2v_type msg; 58 int i; 59 60 if (create) 61 atomic_inc(px_used(ppgtt->pd)); /* never remove */ 62 else 63 atomic_dec(px_used(ppgtt->pd)); 64 65 mutex_lock(&i915->vgpu.lock); 66 67 if (i915_vm_is_4lvl(&ppgtt->vm)) { 68 const u64 daddr = px_dma(ppgtt->pd); 69 70 intel_uncore_write(uncore, 71 vgtif_reg(pdp[0].lo), lower_32_bits(daddr)); 72 intel_uncore_write(uncore, 73 vgtif_reg(pdp[0].hi), upper_32_bits(daddr)); 74 75 msg = create ? 76 VGT_G2V_PPGTT_L4_PAGE_TABLE_CREATE : 77 VGT_G2V_PPGTT_L4_PAGE_TABLE_DESTROY; 78 } else { 79 for (i = 0; i < GEN8_3LVL_PDPES; i++) { 80 const u64 daddr = i915_page_dir_dma_addr(ppgtt, i); 81 82 intel_uncore_write(uncore, 83 vgtif_reg(pdp[i].lo), 84 lower_32_bits(daddr)); 85 intel_uncore_write(uncore, 86 vgtif_reg(pdp[i].hi), 87 upper_32_bits(daddr)); 88 } 89 90 msg = create ? 91 VGT_G2V_PPGTT_L3_PAGE_TABLE_CREATE : 92 VGT_G2V_PPGTT_L3_PAGE_TABLE_DESTROY; 93 } 94 95 /* g2v_notify atomically (via hv trap) consumes the message packet. */ 96 intel_uncore_write(uncore, vgtif_reg(g2v_notify), msg); 97 98 mutex_unlock(&i915->vgpu.lock); 99 } 100 101 /* Index shifts into the pagetable are offset by GEN8_PTE_SHIFT [12] */ 102 #define GEN8_PAGE_SIZE (SZ_4K) /* page and page-directory sizes are the same */ 103 #define GEN8_PTE_SHIFT (ilog2(GEN8_PAGE_SIZE)) 104 #define GEN8_PDES (GEN8_PAGE_SIZE / sizeof(u64)) 105 #define gen8_pd_shift(lvl) ((lvl) * ilog2(GEN8_PDES)) 106 #define gen8_pd_index(i, lvl) i915_pde_index((i), gen8_pd_shift(lvl)) 107 #define __gen8_pte_shift(lvl) (GEN8_PTE_SHIFT + gen8_pd_shift(lvl)) 108 #define __gen8_pte_index(a, lvl) i915_pde_index((a), __gen8_pte_shift(lvl)) 109 110 #define as_pd(x) container_of((x), typeof(struct i915_page_directory), pt) 111 112 static inline unsigned int 113 gen8_pd_range(u64 start, u64 end, int lvl, unsigned int *idx) 114 { 115 const int shift = gen8_pd_shift(lvl); 116 const u64 mask = ~0ull << gen8_pd_shift(lvl + 1); 117 118 GEM_BUG_ON(start >= end); 119 end += ~mask >> gen8_pd_shift(1); 120 121 *idx = i915_pde_index(start, shift); 122 if ((start ^ end) & mask) 123 return GEN8_PDES - *idx; 124 else 125 return i915_pde_index(end, shift) - *idx; 126 } 127 128 static inline bool gen8_pd_contains(u64 start, u64 end, int lvl) 129 { 130 const u64 mask = ~0ull << gen8_pd_shift(lvl + 1); 131 132 GEM_BUG_ON(start >= end); 133 return (start ^ end) & mask && (start & ~mask) == 0; 134 } 135 136 static inline unsigned int gen8_pt_count(u64 start, u64 end) 137 { 138 GEM_BUG_ON(start >= end); 139 if ((start ^ end) >> gen8_pd_shift(1)) 140 return GEN8_PDES - (start & (GEN8_PDES - 1)); 141 else 142 return end - start; 143 } 144 145 static inline unsigned int 146 gen8_pd_top_count(const struct i915_address_space *vm) 147 { 148 unsigned int shift = __gen8_pte_shift(vm->top); 149 return (vm->total + (1ull << shift) - 1) >> shift; 150 } 151 152 static inline struct i915_page_directory * 153 gen8_pdp_for_page_index(struct i915_address_space * const vm, const u64 idx) 154 { 155 struct i915_ppgtt * const ppgtt = i915_vm_to_ppgtt(vm); 156 157 if (vm->top == 2) 158 return ppgtt->pd; 159 else 160 return i915_pd_entry(ppgtt->pd, gen8_pd_index(idx, vm->top)); 161 } 162 163 static inline struct i915_page_directory * 164 gen8_pdp_for_page_address(struct i915_address_space * const vm, const u64 addr) 165 { 166 return gen8_pdp_for_page_index(vm, addr >> GEN8_PTE_SHIFT); 167 } 168 169 static void __gen8_ppgtt_cleanup(struct i915_address_space *vm, 170 struct i915_page_directory *pd, 171 int count, int lvl) 172 { 173 if (lvl) { 174 void **pde = pd->entry; 175 176 do { 177 if (!*pde) 178 continue; 179 180 __gen8_ppgtt_cleanup(vm, *pde, GEN8_PDES, lvl - 1); 181 } while (pde++, --count); 182 } 183 184 free_px(vm, pd); 185 } 186 187 static void gen8_ppgtt_cleanup(struct i915_address_space *vm) 188 { 189 struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm); 190 191 if (intel_vgpu_active(vm->i915)) 192 gen8_ppgtt_notify_vgt(ppgtt, false); 193 194 __gen8_ppgtt_cleanup(vm, ppgtt->pd, gen8_pd_top_count(vm), vm->top); 195 free_scratch(vm); 196 } 197 198 static u64 __gen8_ppgtt_clear(struct i915_address_space * const vm, 199 struct i915_page_directory * const pd, 200 u64 start, const u64 end, int lvl) 201 { 202 const struct i915_page_scratch * const scratch = &vm->scratch[lvl]; 203 unsigned int idx, len; 204 205 GEM_BUG_ON(end > vm->total >> GEN8_PTE_SHIFT); 206 207 len = gen8_pd_range(start, end, lvl--, &idx); 208 DBG("%s(%p):{ lvl:%d, start:%llx, end:%llx, idx:%d, len:%d, used:%d }\n", 209 __func__, vm, lvl + 1, start, end, 210 idx, len, atomic_read(px_used(pd))); 211 GEM_BUG_ON(!len || len >= atomic_read(px_used(pd))); 212 213 do { 214 struct i915_page_table *pt = pd->entry[idx]; 215 216 if (atomic_fetch_inc(&pt->used) >> gen8_pd_shift(1) && 217 gen8_pd_contains(start, end, lvl)) { 218 DBG("%s(%p):{ lvl:%d, idx:%d, start:%llx, end:%llx } removing pd\n", 219 __func__, vm, lvl + 1, idx, start, end); 220 clear_pd_entry(pd, idx, scratch); 221 __gen8_ppgtt_cleanup(vm, as_pd(pt), I915_PDES, lvl); 222 start += (u64)I915_PDES << gen8_pd_shift(lvl); 223 continue; 224 } 225 226 if (lvl) { 227 start = __gen8_ppgtt_clear(vm, as_pd(pt), 228 start, end, lvl); 229 } else { 230 unsigned int count; 231 u64 *vaddr; 232 233 count = gen8_pt_count(start, end); 234 DBG("%s(%p):{ lvl:%d, start:%llx, end:%llx, idx:%d, len:%d, used:%d } removing pte\n", 235 __func__, vm, lvl, start, end, 236 gen8_pd_index(start, 0), count, 237 atomic_read(&pt->used)); 238 GEM_BUG_ON(!count || count >= atomic_read(&pt->used)); 239 240 vaddr = kmap_atomic_px(pt); 241 memset64(vaddr + gen8_pd_index(start, 0), 242 vm->scratch[0].encode, 243 count); 244 kunmap_atomic(vaddr); 245 246 atomic_sub(count, &pt->used); 247 start += count; 248 } 249 250 if (release_pd_entry(pd, idx, pt, scratch)) 251 free_px(vm, pt); 252 } while (idx++, --len); 253 254 return start; 255 } 256 257 static void gen8_ppgtt_clear(struct i915_address_space *vm, 258 u64 start, u64 length) 259 { 260 GEM_BUG_ON(!IS_ALIGNED(start, BIT_ULL(GEN8_PTE_SHIFT))); 261 GEM_BUG_ON(!IS_ALIGNED(length, BIT_ULL(GEN8_PTE_SHIFT))); 262 GEM_BUG_ON(range_overflows(start, length, vm->total)); 263 264 start >>= GEN8_PTE_SHIFT; 265 length >>= GEN8_PTE_SHIFT; 266 GEM_BUG_ON(length == 0); 267 268 __gen8_ppgtt_clear(vm, i915_vm_to_ppgtt(vm)->pd, 269 start, start + length, vm->top); 270 } 271 272 static int __gen8_ppgtt_alloc(struct i915_address_space * const vm, 273 struct i915_page_directory * const pd, 274 u64 * const start, const u64 end, int lvl) 275 { 276 const struct i915_page_scratch * const scratch = &vm->scratch[lvl]; 277 struct i915_page_table *alloc = NULL; 278 unsigned int idx, len; 279 int ret = 0; 280 281 GEM_BUG_ON(end > vm->total >> GEN8_PTE_SHIFT); 282 283 len = gen8_pd_range(*start, end, lvl--, &idx); 284 DBG("%s(%p):{ lvl:%d, start:%llx, end:%llx, idx:%d, len:%d, used:%d }\n", 285 __func__, vm, lvl + 1, *start, end, 286 idx, len, atomic_read(px_used(pd))); 287 GEM_BUG_ON(!len || (idx + len - 1) >> gen8_pd_shift(1)); 288 289 spin_lock(&pd->lock); 290 GEM_BUG_ON(!atomic_read(px_used(pd))); /* Must be pinned! */ 291 do { 292 struct i915_page_table *pt = pd->entry[idx]; 293 294 if (!pt) { 295 spin_unlock(&pd->lock); 296 297 DBG("%s(%p):{ lvl:%d, idx:%d } allocating new tree\n", 298 __func__, vm, lvl + 1, idx); 299 300 pt = fetch_and_zero(&alloc); 301 if (lvl) { 302 if (!pt) { 303 pt = &alloc_pd(vm)->pt; 304 if (IS_ERR(pt)) { 305 ret = PTR_ERR(pt); 306 goto out; 307 } 308 } 309 310 fill_px(pt, vm->scratch[lvl].encode); 311 } else { 312 if (!pt) { 313 pt = alloc_pt(vm); 314 if (IS_ERR(pt)) { 315 ret = PTR_ERR(pt); 316 goto out; 317 } 318 } 319 320 if (intel_vgpu_active(vm->i915) || 321 gen8_pt_count(*start, end) < I915_PDES) 322 fill_px(pt, vm->scratch[lvl].encode); 323 } 324 325 spin_lock(&pd->lock); 326 if (likely(!pd->entry[idx])) 327 set_pd_entry(pd, idx, pt); 328 else 329 alloc = pt, pt = pd->entry[idx]; 330 } 331 332 if (lvl) { 333 atomic_inc(&pt->used); 334 spin_unlock(&pd->lock); 335 336 ret = __gen8_ppgtt_alloc(vm, as_pd(pt), 337 start, end, lvl); 338 if (unlikely(ret)) { 339 if (release_pd_entry(pd, idx, pt, scratch)) 340 free_px(vm, pt); 341 goto out; 342 } 343 344 spin_lock(&pd->lock); 345 atomic_dec(&pt->used); 346 GEM_BUG_ON(!atomic_read(&pt->used)); 347 } else { 348 unsigned int count = gen8_pt_count(*start, end); 349 350 DBG("%s(%p):{ lvl:%d, start:%llx, end:%llx, idx:%d, len:%d, used:%d } inserting pte\n", 351 __func__, vm, lvl, *start, end, 352 gen8_pd_index(*start, 0), count, 353 atomic_read(&pt->used)); 354 355 atomic_add(count, &pt->used); 356 /* All other pdes may be simultaneously removed */ 357 GEM_BUG_ON(atomic_read(&pt->used) > NALLOC * I915_PDES); 358 *start += count; 359 } 360 } while (idx++, --len); 361 spin_unlock(&pd->lock); 362 out: 363 if (alloc) 364 free_px(vm, alloc); 365 return ret; 366 } 367 368 static int gen8_ppgtt_alloc(struct i915_address_space *vm, 369 u64 start, u64 length) 370 { 371 u64 from; 372 int err; 373 374 GEM_BUG_ON(!IS_ALIGNED(start, BIT_ULL(GEN8_PTE_SHIFT))); 375 GEM_BUG_ON(!IS_ALIGNED(length, BIT_ULL(GEN8_PTE_SHIFT))); 376 GEM_BUG_ON(range_overflows(start, length, vm->total)); 377 378 start >>= GEN8_PTE_SHIFT; 379 length >>= GEN8_PTE_SHIFT; 380 GEM_BUG_ON(length == 0); 381 from = start; 382 383 err = __gen8_ppgtt_alloc(vm, i915_vm_to_ppgtt(vm)->pd, 384 &start, start + length, vm->top); 385 if (unlikely(err && from != start)) 386 __gen8_ppgtt_clear(vm, i915_vm_to_ppgtt(vm)->pd, 387 from, start, vm->top); 388 389 return err; 390 } 391 392 static __always_inline void 393 write_pte(gen8_pte_t *pte, const gen8_pte_t val) 394 { 395 /* Magic delays? Or can we refine these to flush all in one pass? */ 396 *pte = val; 397 wmb(); /* cpu to cache */ 398 clflush(pte); /* cache to memory */ 399 wmb(); /* visible to all */ 400 } 401 402 static __always_inline u64 403 gen8_ppgtt_insert_pte(struct i915_ppgtt *ppgtt, 404 struct i915_page_directory *pdp, 405 struct sgt_dma *iter, 406 u64 idx, 407 enum i915_cache_level cache_level, 408 u32 flags) 409 { 410 struct i915_page_directory *pd; 411 const gen8_pte_t pte_encode = gen8_pte_encode(0, cache_level, flags); 412 gen8_pte_t *vaddr; 413 414 pd = i915_pd_entry(pdp, gen8_pd_index(idx, 2)); 415 vaddr = kmap_atomic_px(i915_pt_entry(pd, gen8_pd_index(idx, 1))); 416 do { 417 GEM_BUG_ON(iter->sg->length < I915_GTT_PAGE_SIZE); 418 write_pte(&vaddr[gen8_pd_index(idx, 0)], 419 pte_encode | iter->dma); 420 421 iter->dma += I915_GTT_PAGE_SIZE; 422 if (iter->dma >= iter->max) { 423 iter->sg = __sg_next(iter->sg); 424 if (!iter->sg) { 425 idx = 0; 426 break; 427 } 428 429 iter->dma = sg_dma_address(iter->sg); 430 iter->max = iter->dma + iter->sg->length; 431 } 432 433 if (gen8_pd_index(++idx, 0) == 0) { 434 if (gen8_pd_index(idx, 1) == 0) { 435 /* Limited by sg length for 3lvl */ 436 if (gen8_pd_index(idx, 2) == 0) 437 break; 438 439 pd = pdp->entry[gen8_pd_index(idx, 2)]; 440 } 441 442 kunmap_atomic(vaddr); 443 vaddr = kmap_atomic_px(i915_pt_entry(pd, gen8_pd_index(idx, 1))); 444 } 445 } while (1); 446 kunmap_atomic(vaddr); 447 448 return idx; 449 } 450 451 static void gen8_ppgtt_insert_huge(struct i915_vma *vma, 452 struct sgt_dma *iter, 453 enum i915_cache_level cache_level, 454 u32 flags) 455 { 456 const gen8_pte_t pte_encode = gen8_pte_encode(0, cache_level, flags); 457 u64 start = vma->node.start; 458 dma_addr_t rem = iter->sg->length; 459 460 GEM_BUG_ON(!i915_vm_is_4lvl(vma->vm)); 461 462 do { 463 struct i915_page_directory * const pdp = 464 gen8_pdp_for_page_address(vma->vm, start); 465 struct i915_page_directory * const pd = 466 i915_pd_entry(pdp, __gen8_pte_index(start, 2)); 467 gen8_pte_t encode = pte_encode; 468 unsigned int maybe_64K = -1; 469 unsigned int page_size; 470 gen8_pte_t *vaddr; 471 u16 index; 472 473 if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_2M && 474 IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_2M) && 475 rem >= I915_GTT_PAGE_SIZE_2M && 476 !__gen8_pte_index(start, 0)) { 477 index = __gen8_pte_index(start, 1); 478 encode |= GEN8_PDE_PS_2M; 479 page_size = I915_GTT_PAGE_SIZE_2M; 480 481 vaddr = kmap_atomic_px(pd); 482 } else { 483 struct i915_page_table *pt = 484 i915_pt_entry(pd, __gen8_pte_index(start, 1)); 485 486 index = __gen8_pte_index(start, 0); 487 page_size = I915_GTT_PAGE_SIZE; 488 489 if (!index && 490 vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K && 491 IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_64K) && 492 (IS_ALIGNED(rem, I915_GTT_PAGE_SIZE_64K) || 493 rem >= (I915_PDES - index) * I915_GTT_PAGE_SIZE)) 494 maybe_64K = __gen8_pte_index(start, 1); 495 496 vaddr = kmap_atomic_px(pt); 497 } 498 499 do { 500 GEM_BUG_ON(iter->sg->length < page_size); 501 write_pte(&vaddr[index++], encode | iter->dma); 502 503 start += page_size; 504 iter->dma += page_size; 505 rem -= page_size; 506 if (iter->dma >= iter->max) { 507 iter->sg = __sg_next(iter->sg); 508 if (!iter->sg) 509 break; 510 511 rem = iter->sg->length; 512 iter->dma = sg_dma_address(iter->sg); 513 iter->max = iter->dma + rem; 514 515 if (maybe_64K != -1 && index < I915_PDES && 516 !(IS_ALIGNED(iter->dma, I915_GTT_PAGE_SIZE_64K) && 517 (IS_ALIGNED(rem, I915_GTT_PAGE_SIZE_64K) || 518 rem >= (I915_PDES - index) * I915_GTT_PAGE_SIZE))) 519 maybe_64K = -1; 520 521 if (unlikely(!IS_ALIGNED(iter->dma, page_size))) 522 break; 523 } 524 } while (rem >= page_size && index < I915_PDES); 525 526 kunmap_atomic(vaddr); 527 528 /* 529 * Is it safe to mark the 2M block as 64K? -- Either we have 530 * filled whole page-table with 64K entries, or filled part of 531 * it and have reached the end of the sg table and we have 532 * enough padding. 533 */ 534 if (maybe_64K != -1 && 535 (index == I915_PDES || 536 (i915_vm_has_scratch_64K(vma->vm) && 537 !iter->sg && IS_ALIGNED(vma->node.start + 538 vma->node.size, 539 I915_GTT_PAGE_SIZE_2M)))) { 540 vaddr = kmap_atomic_px(pd); 541 vaddr[maybe_64K] |= GEN8_PDE_IPS_64K; 542 kunmap_atomic(vaddr); 543 page_size = I915_GTT_PAGE_SIZE_64K; 544 545 /* 546 * We write all 4K page entries, even when using 64K 547 * pages. In order to verify that the HW isn't cheating 548 * by using the 4K PTE instead of the 64K PTE, we want 549 * to remove all the surplus entries. If the HW skipped 550 * the 64K PTE, it will read/write into the scratch page 551 * instead - which we detect as missing results during 552 * selftests. 553 */ 554 if (I915_SELFTEST_ONLY(vma->vm->scrub_64K)) { 555 u16 i; 556 557 encode = vma->vm->scratch[0].encode; 558 vaddr = kmap_atomic_px(i915_pt_entry(pd, maybe_64K)); 559 560 for (i = 1; i < index; i += 16) 561 memset64(vaddr + i, encode, 15); 562 563 kunmap_atomic(vaddr); 564 } 565 } 566 567 vma->page_sizes.gtt |= page_size; 568 } while (iter->sg); 569 } 570 571 static void gen8_ppgtt_insert(struct i915_address_space *vm, 572 struct i915_vma *vma, 573 enum i915_cache_level cache_level, 574 u32 flags) 575 { 576 struct i915_ppgtt * const ppgtt = i915_vm_to_ppgtt(vm); 577 struct sgt_dma iter = sgt_dma(vma); 578 579 if (vma->page_sizes.sg > I915_GTT_PAGE_SIZE) { 580 gen8_ppgtt_insert_huge(vma, &iter, cache_level, flags); 581 } else { 582 u64 idx = vma->node.start >> GEN8_PTE_SHIFT; 583 584 do { 585 struct i915_page_directory * const pdp = 586 gen8_pdp_for_page_index(vm, idx); 587 588 idx = gen8_ppgtt_insert_pte(ppgtt, pdp, &iter, idx, 589 cache_level, flags); 590 } while (idx); 591 592 vma->page_sizes.gtt = I915_GTT_PAGE_SIZE; 593 } 594 } 595 596 static int gen8_init_scratch(struct i915_address_space *vm) 597 { 598 int ret; 599 int i; 600 601 /* 602 * If everybody agrees to not to write into the scratch page, 603 * we can reuse it for all vm, keeping contexts and processes separate. 604 */ 605 if (vm->has_read_only && vm->gt->vm && !i915_is_ggtt(vm->gt->vm)) { 606 struct i915_address_space *clone = vm->gt->vm; 607 608 GEM_BUG_ON(!clone->has_read_only); 609 610 vm->scratch_order = clone->scratch_order; 611 memcpy(vm->scratch, clone->scratch, sizeof(vm->scratch)); 612 px_dma(&vm->scratch[0]) = 0; /* no xfer of ownership */ 613 return 0; 614 } 615 616 ret = setup_scratch_page(vm, __GFP_HIGHMEM); 617 if (ret) 618 return ret; 619 620 vm->scratch[0].encode = 621 gen8_pte_encode(px_dma(&vm->scratch[0]), 622 I915_CACHE_LLC, vm->has_read_only); 623 624 for (i = 1; i <= vm->top; i++) { 625 if (unlikely(setup_page_dma(vm, px_base(&vm->scratch[i])))) 626 goto free_scratch; 627 628 fill_px(&vm->scratch[i], vm->scratch[i - 1].encode); 629 vm->scratch[i].encode = 630 gen8_pde_encode(px_dma(&vm->scratch[i]), 631 I915_CACHE_LLC); 632 } 633 634 return 0; 635 636 free_scratch: 637 free_scratch(vm); 638 return -ENOMEM; 639 } 640 641 static int gen8_preallocate_top_level_pdp(struct i915_ppgtt *ppgtt) 642 { 643 struct i915_address_space *vm = &ppgtt->vm; 644 struct i915_page_directory *pd = ppgtt->pd; 645 unsigned int idx; 646 647 GEM_BUG_ON(vm->top != 2); 648 GEM_BUG_ON(gen8_pd_top_count(vm) != GEN8_3LVL_PDPES); 649 650 for (idx = 0; idx < GEN8_3LVL_PDPES; idx++) { 651 struct i915_page_directory *pde; 652 653 pde = alloc_pd(vm); 654 if (IS_ERR(pde)) 655 return PTR_ERR(pde); 656 657 fill_px(pde, vm->scratch[1].encode); 658 set_pd_entry(pd, idx, pde); 659 atomic_inc(px_used(pde)); /* keep pinned */ 660 } 661 wmb(); 662 663 return 0; 664 } 665 666 static struct i915_page_directory * 667 gen8_alloc_top_pd(struct i915_address_space *vm) 668 { 669 const unsigned int count = gen8_pd_top_count(vm); 670 struct i915_page_directory *pd; 671 672 GEM_BUG_ON(count > ARRAY_SIZE(pd->entry)); 673 674 pd = __alloc_pd(offsetof(typeof(*pd), entry[count])); 675 if (unlikely(!pd)) 676 return ERR_PTR(-ENOMEM); 677 678 if (unlikely(setup_page_dma(vm, px_base(pd)))) { 679 kfree(pd); 680 return ERR_PTR(-ENOMEM); 681 } 682 683 fill_page_dma(px_base(pd), vm->scratch[vm->top].encode, count); 684 atomic_inc(px_used(pd)); /* mark as pinned */ 685 return pd; 686 } 687 688 /* 689 * GEN8 legacy ppgtt programming is accomplished through a max 4 PDP registers 690 * with a net effect resembling a 2-level page table in normal x86 terms. Each 691 * PDP represents 1GB of memory 4 * 512 * 512 * 4096 = 4GB legacy 32b address 692 * space. 693 * 694 */ 695 struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt) 696 { 697 struct i915_ppgtt *ppgtt; 698 int err; 699 700 ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL); 701 if (!ppgtt) 702 return ERR_PTR(-ENOMEM); 703 704 ppgtt_init(ppgtt, gt); 705 ppgtt->vm.top = i915_vm_is_4lvl(&ppgtt->vm) ? 3 : 2; 706 707 /* 708 * From bdw, there is hw support for read-only pages in the PPGTT. 709 * 710 * Gen11 has HSDES#:1807136187 unresolved. Disable ro support 711 * for now. 712 * 713 * Gen12 has inherited the same read-only fault issue from gen11. 714 */ 715 ppgtt->vm.has_read_only = !IS_GEN_RANGE(gt->i915, 11, 12); 716 717 /* 718 * There are only few exceptions for gen >=6. chv and bxt. 719 * And we are not sure about the latter so play safe for now. 720 */ 721 if (IS_CHERRYVIEW(gt->i915) || IS_BROXTON(gt->i915)) 722 ppgtt->vm.pt_kmap_wc = true; 723 724 err = gen8_init_scratch(&ppgtt->vm); 725 if (err) 726 goto err_free; 727 728 ppgtt->pd = gen8_alloc_top_pd(&ppgtt->vm); 729 if (IS_ERR(ppgtt->pd)) { 730 err = PTR_ERR(ppgtt->pd); 731 goto err_free_scratch; 732 } 733 734 if (!i915_vm_is_4lvl(&ppgtt->vm)) { 735 err = gen8_preallocate_top_level_pdp(ppgtt); 736 if (err) 737 goto err_free_pd; 738 } 739 740 ppgtt->vm.bind_async_flags = I915_VMA_LOCAL_BIND; 741 ppgtt->vm.insert_entries = gen8_ppgtt_insert; 742 ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc; 743 ppgtt->vm.clear_range = gen8_ppgtt_clear; 744 745 ppgtt->vm.pte_encode = gen8_pte_encode; 746 747 if (intel_vgpu_active(gt->i915)) 748 gen8_ppgtt_notify_vgt(ppgtt, true); 749 750 ppgtt->vm.cleanup = gen8_ppgtt_cleanup; 751 752 return ppgtt; 753 754 err_free_pd: 755 __gen8_ppgtt_cleanup(&ppgtt->vm, ppgtt->pd, 756 gen8_pd_top_count(&ppgtt->vm), ppgtt->vm.top); 757 err_free_scratch: 758 free_scratch(&ppgtt->vm); 759 err_free: 760 kfree(ppgtt); 761 return ERR_PTR(err); 762 } 763