drivers/gpu/drm/i915/i915_gem_gtt.c

   1 /*
   2  * Copyright © 2010 Daniel Vetter
   3  * Copyright © 2011-2014 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  *
  24  */
  25
  26 #include <linux/seq_file.h>
  27 #include <drm/drmP.h>
  28 #include <drm/i915_drm.h>
  29 #include "i915_drv.h"
  30 #include "i915_trace.h"
  31 #include "intel_drv.h"
  32
  33 static void bdw_setup_private_ppat(struct drm_i915_private *dev_priv);
  34 static void chv_setup_private_ppat(struct drm_i915_private *dev_priv);
  35
  36 static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
  37 {
  38         bool has_aliasing_ppgtt;
  39         bool has_full_ppgtt;
  40
  41         has_aliasing_ppgtt = INTEL_INFO(dev)->gen >= 6;
  42         has_full_ppgtt = INTEL_INFO(dev)->gen >= 7;
  43         if (IS_GEN8(dev))
  44                 has_full_ppgtt = false; /* XXX why? */
  45
  46         if (enable_ppgtt == 0 || !has_aliasing_ppgtt)
  47                 return 0;
  48
  49         if (enable_ppgtt == 1)
  50                 return 1;
  51
  52         if (enable_ppgtt == 2 && has_full_ppgtt)
  53                 return 2;
  54
  55 #ifdef CONFIG_INTEL_IOMMU
  56         /* Disable ppgtt on SNB if VT-d is on. */
  57         if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
  58                 DRM_INFO("Disabling PPGTT because VT-d is on\n");
  59                 return 0;
  60         }
  61 #endif
  62
  63         /* Early VLV doesn't have this */
  64         if (IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev) &&
  65             dev->pdev->revision < 0xb) {
  66                 DRM_DEBUG_DRIVER("disabling PPGTT on pre-B3 step VLV\n");
  67                 return 0;
  68         }
  69
  70         return has_aliasing_ppgtt ? 1 : 0;
  71 }
  72
  73
  74 static void ppgtt_bind_vma(struct i915_vma *vma,
  75                            enum i915_cache_level cache_level,
  76                            u32 flags);
  77 static void ppgtt_unbind_vma(struct i915_vma *vma);
  78
  79 static inline gen8_gtt_pte_t gen8_pte_encode(dma_addr_t addr,
  80                                              enum i915_cache_level level,
  81                                              bool valid)
  82 {
  83         gen8_gtt_pte_t pte = valid ? _PAGE_PRESENT | _PAGE_RW : 0;
  84         pte |= addr;
  85
  86         switch (level) {
  87         case I915_CACHE_NONE:
  88                 pte |= PPAT_UNCACHED_INDEX;
  89                 break;
  90         case I915_CACHE_WT:
  91                 pte |= PPAT_DISPLAY_ELLC_INDEX;
  92                 break;
  93         default:
  94                 pte |= PPAT_CACHED_INDEX;
  95                 break;
  96         }
  97
  98         return pte;
  99 }
 100
 101 static inline gen8_ppgtt_pde_t gen8_pde_encode(struct drm_device *dev,
 102                                              dma_addr_t addr,
 103                                              enum i915_cache_level level)
 104 {
 105         gen8_ppgtt_pde_t pde = _PAGE_PRESENT | _PAGE_RW;
 106         pde |= addr;
 107         if (level != I915_CACHE_NONE)
 108                 pde |= PPAT_CACHED_PDE_INDEX;
 109         else
 110                 pde |= PPAT_UNCACHED_INDEX;
 111         return pde;
 112 }
 113
 114 static gen6_gtt_pte_t snb_pte_encode(dma_addr_t addr,
 115                                      enum i915_cache_level level,
 116                                      bool valid, u32 unused)
 117 {
 118         gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
 119         pte |= GEN6_PTE_ADDR_ENCODE(addr);
 120
 121         switch (level) {
 122         case I915_CACHE_L3_LLC:
 123         case I915_CACHE_LLC:
 124                 pte |= GEN6_PTE_CACHE_LLC;
 125                 break;
 126         case I915_CACHE_NONE:
 127                 pte |= GEN6_PTE_UNCACHED;
 128                 break;
 129         default:
 130                 WARN_ON(1);
 131         }
 132
 133         return pte;
 134 }
 135
 136 static gen6_gtt_pte_t ivb_pte_encode(dma_addr_t addr,
 137                                      enum i915_cache_level level,
 138                                      bool valid, u32 unused)
 139 {
 140         gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
 141         pte |= GEN6_PTE_ADDR_ENCODE(addr);
 142
 143         switch (level) {
 144         case I915_CACHE_L3_LLC:
 145                 pte |= GEN7_PTE_CACHE_L3_LLC;
 146                 break;
 147         case I915_CACHE_LLC:
 148                 pte |= GEN6_PTE_CACHE_LLC;
 149                 break;
 150         case I915_CACHE_NONE:
 151                 pte |= GEN6_PTE_UNCACHED;
 152                 break;
 153         default:
 154                 WARN_ON(1);
 155         }
 156
 157         return pte;
 158 }
 159
 160 static gen6_gtt_pte_t byt_pte_encode(dma_addr_t addr,
 161                                      enum i915_cache_level level,
 162                                      bool valid, u32 flags)
 163 {
 164         gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
 165         pte |= GEN6_PTE_ADDR_ENCODE(addr);
 166
 167         /* Mark the page as writeable.  Other platforms don't have a
 168          * setting for read-only/writable, so this matches that behavior.
 169          */
 170         if (!(flags & PTE_READ_ONLY))
 171                 pte |= BYT_PTE_WRITEABLE;
 172
 173         if (level != I915_CACHE_NONE)
 174                 pte |= BYT_PTE_SNOOPED_BY_CPU_CACHES;
 175
 176         return pte;
 177 }
 178
 179 static gen6_gtt_pte_t hsw_pte_encode(dma_addr_t addr,
 180                                      enum i915_cache_level level,
 181                                      bool valid, u32 unused)
 182 {
 183         gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
 184         pte |= HSW_PTE_ADDR_ENCODE(addr);
 185
 186         if (level != I915_CACHE_NONE)
 187                 pte |= HSW_WB_LLC_AGE3;
 188
 189         return pte;
 190 }
 191
 192 static gen6_gtt_pte_t iris_pte_encode(dma_addr_t addr,
 193                                       enum i915_cache_level level,
 194                                       bool valid, u32 unused)
 195 {
 196         gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
 197         pte |= HSW_PTE_ADDR_ENCODE(addr);
 198
 199         switch (level) {
 200         case I915_CACHE_NONE:
 201                 break;
 202         case I915_CACHE_WT:
 203                 pte |= HSW_WT_ELLC_LLC_AGE3;
 204                 break;
 205         default:
 206                 pte |= HSW_WB_ELLC_LLC_AGE3;
 207                 break;
 208         }
 209
 210         return pte;
 211 }
 212
 213 /* Broadwell Page Directory Pointer Descriptors */
 214 static int gen8_write_pdp(struct intel_engine_cs *ring, unsigned entry,
 215                            uint64_t val)
 216 {
 217         int ret;
 218
 219         BUG_ON(entry >= 4);
 220
 221         ret = intel_ring_begin(ring, 6);
 222         if (ret)
 223                 return ret;
 224
 225         intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
 226         intel_ring_emit(ring, GEN8_RING_PDP_UDW(ring, entry));
 227         intel_ring_emit(ring, (u32)(val >> 32));
 228         intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
 229         intel_ring_emit(ring, GEN8_RING_PDP_LDW(ring, entry));
 230         intel_ring_emit(ring, (u32)(val));
 231         intel_ring_advance(ring);
 232
 233         return 0;
 234 }
 235
 236 static int gen8_mm_switch(struct i915_hw_ppgtt *ppgtt,
 237                           struct intel_engine_cs *ring)
 238 {
 239         int i, ret;
 240
 241         /* bit of a hack to find the actual last used pd */
 242         int used_pd = ppgtt->num_pd_entries / GEN8_PDES_PER_PAGE;
 243
 244         for (i = used_pd - 1; i >= 0; i--) {
 245                 dma_addr_t addr = ppgtt->pd_dma_addr[i];
 246                 ret = gen8_write_pdp(ring, i, addr);
 247                 if (ret)
 248                         return ret;
 249         }
 250
 251         return 0;
 252 }
 253
 254 static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
 255                                    uint64_t start,
 256                                    uint64_t length,
 257                                    bool use_scratch)
 258 {
 259         struct i915_hw_ppgtt *ppgtt =
 260                 container_of(vm, struct i915_hw_ppgtt, base);
 261         gen8_gtt_pte_t *pt_vaddr, scratch_pte;
 262         unsigned pdpe = start >> GEN8_PDPE_SHIFT & GEN8_PDPE_MASK;
 263         unsigned pde = start >> GEN8_PDE_SHIFT & GEN8_PDE_MASK;
 264         unsigned pte = start >> GEN8_PTE_SHIFT & GEN8_PTE_MASK;
 265         unsigned num_entries = length >> PAGE_SHIFT;
 266         unsigned last_pte, i;
 267
 268         scratch_pte = gen8_pte_encode(ppgtt->base.scratch.addr,
 269                                       I915_CACHE_LLC, use_scratch);
 270
 271         while (num_entries) {
 272                 struct page *page_table = ppgtt->gen8_pt_pages[pdpe][pde];
 273
 274                 last_pte = pte + num_entries;
 275                 if (last_pte > GEN8_PTES_PER_PAGE)
 276                         last_pte = GEN8_PTES_PER_PAGE;
 277
 278                 pt_vaddr = kmap_atomic(page_table);
 279
 280                 for (i = pte; i < last_pte; i++) {
 281                         pt_vaddr[i] = scratch_pte;
 282                         num_entries--;
 283                 }
 284
 285                 if (!HAS_LLC(ppgtt->base.dev))
 286                         drm_clflush_virt_range(pt_vaddr, PAGE_SIZE);
 287                 kunmap_atomic(pt_vaddr);
 288
 289                 pte = 0;
 290                 if (++pde == GEN8_PDES_PER_PAGE) {
 291                         pdpe++;
 292                         pde = 0;
 293                 }
 294         }
 295 }
 296
 297 static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
 298                                       struct sg_table *pages,
 299                                       uint64_t start,
 300                                       enum i915_cache_level cache_level, u32 unused)
 301 {
 302         struct i915_hw_ppgtt *ppgtt =
 303                 container_of(vm, struct i915_hw_ppgtt, base);
 304         gen8_gtt_pte_t *pt_vaddr;
 305         unsigned pdpe = start >> GEN8_PDPE_SHIFT & GEN8_PDPE_MASK;
 306         unsigned pde = start >> GEN8_PDE_SHIFT & GEN8_PDE_MASK;
 307         unsigned pte = start >> GEN8_PTE_SHIFT & GEN8_PTE_MASK;
 308         struct sg_page_iter sg_iter;
 309
 310         pt_vaddr = NULL;
 311
 312         for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) {
 313                 if (WARN_ON(pdpe >= GEN8_LEGACY_PDPS))
 314                         break;
 315
 316                 if (pt_vaddr == NULL)
 317                         pt_vaddr = kmap_atomic(ppgtt->gen8_pt_pages[pdpe][pde]);
 318
 319                 pt_vaddr[pte] =
 320                         gen8_pte_encode(sg_page_iter_dma_address(&sg_iter),
 321                                         cache_level, true);
 322                 if (++pte == GEN8_PTES_PER_PAGE) {
 323                         if (!HAS_LLC(ppgtt->base.dev))
 324                                 drm_clflush_virt_range(pt_vaddr, PAGE_SIZE);
 325                         kunmap_atomic(pt_vaddr);
 326                         pt_vaddr = NULL;
 327                         if (++pde == GEN8_PDES_PER_PAGE) {
 328                                 pdpe++;
 329                                 pde = 0;
 330                         }
 331                         pte = 0;
 332                 }
 333         }
 334         if (pt_vaddr) {
 335                 if (!HAS_LLC(ppgtt->base.dev))
 336                         drm_clflush_virt_range(pt_vaddr, PAGE_SIZE);
 337                 kunmap_atomic(pt_vaddr);
 338         }
 339 }
 340
 341 static void gen8_free_page_tables(struct page **pt_pages)
 342 {
 343         int i;
 344
 345         if (pt_pages == NULL)
 346                 return;
 347
 348         for (i = 0; i < GEN8_PDES_PER_PAGE; i++)
 349                 if (pt_pages[i])
 350                         __free_pages(pt_pages[i], 0);
 351 }
 352
 353 static void gen8_ppgtt_free(const struct i915_hw_ppgtt *ppgtt)
 354 {
 355         int i;
 356
 357         for (i = 0; i < ppgtt->num_pd_pages; i++) {
 358                 gen8_free_page_tables(ppgtt->gen8_pt_pages[i]);
 359                 kfree(ppgtt->gen8_pt_pages[i]);
 360                 kfree(ppgtt->gen8_pt_dma_addr[i]);
 361         }
 362
 363         __free_pages(ppgtt->pd_pages, get_order(ppgtt->num_pd_pages << PAGE_SHIFT));
 364 }
 365
 366 static void gen8_ppgtt_unmap_pages(struct i915_hw_ppgtt *ppgtt)
 367 {
 368         struct pci_dev *hwdev = ppgtt->base.dev->pdev;
 369         int i, j;
 370
 371         for (i = 0; i < ppgtt->num_pd_pages; i++) {
 372                 /* TODO: In the future we'll support sparse mappings, so this
 373                  * will have to change. */
 374                 if (!ppgtt->pd_dma_addr[i])
 375                         continue;
 376
 377                 pci_unmap_page(hwdev, ppgtt->pd_dma_addr[i], PAGE_SIZE,
 378                                PCI_DMA_BIDIRECTIONAL);
 379
 380                 for (j = 0; j < GEN8_PDES_PER_PAGE; j++) {
 381                         dma_addr_t addr = ppgtt->gen8_pt_dma_addr[i][j];
 382                         if (addr)
 383                                 pci_unmap_page(hwdev, addr, PAGE_SIZE,
 384                                                PCI_DMA_BIDIRECTIONAL);
 385                 }
 386         }
 387 }
 388
 389 static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
 390 {
 391         struct i915_hw_ppgtt *ppgtt =
 392                 container_of(vm, struct i915_hw_ppgtt, base);
 393
 394         gen8_ppgtt_unmap_pages(ppgtt);
 395         gen8_ppgtt_free(ppgtt);
 396 }
 397
 398 static struct page **__gen8_alloc_page_tables(void)
 399 {
 400         struct page **pt_pages;
 401         int i;
 402
 403         pt_pages = kcalloc(GEN8_PDES_PER_PAGE, sizeof(struct page *), GFP_KERNEL);
 404         if (!pt_pages)
 405                 return ERR_PTR(-ENOMEM);
 406
 407         for (i = 0; i < GEN8_PDES_PER_PAGE; i++) {
 408                 pt_pages[i] = alloc_page(GFP_KERNEL);
 409                 if (!pt_pages[i])
 410                         goto bail;
 411         }
 412
 413         return pt_pages;
 414
 415 bail:
 416         gen8_free_page_tables(pt_pages);
 417         kfree(pt_pages);
 418         return ERR_PTR(-ENOMEM);
 419 }
 420
 421 static int gen8_ppgtt_allocate_page_tables(struct i915_hw_ppgtt *ppgtt,
 422                                            const int max_pdp)
 423 {
 424         struct page **pt_pages[GEN8_LEGACY_PDPS];
 425         int i, ret;
 426
 427         for (i = 0; i < max_pdp; i++) {
 428                 pt_pages[i] = __gen8_alloc_page_tables();
 429                 if (IS_ERR(pt_pages[i])) {
 430                         ret = PTR_ERR(pt_pages[i]);
 431                         goto unwind_out;
 432                 }
 433         }
 434
 435         /* NB: Avoid touching gen8_pt_pages until last to keep the allocation,
 436          * "atomic" - for cleanup purposes.
 437          */
 438         for (i = 0; i < max_pdp; i++)
 439                 ppgtt->gen8_pt_pages[i] = pt_pages[i];
 440
 441         return 0;
 442
 443 unwind_out:
 444         while (i--) {
 445                 gen8_free_page_tables(pt_pages[i]);
 446                 kfree(pt_pages[i]);
 447         }
 448
 449         return ret;
 450 }
 451
 452 static int gen8_ppgtt_allocate_dma(struct i915_hw_ppgtt *ppgtt)
 453 {
 454         int i;
 455
 456         for (i = 0; i < ppgtt->num_pd_pages; i++) {
 457                 ppgtt->gen8_pt_dma_addr[i] = kcalloc(GEN8_PDES_PER_PAGE,
 458                                                      sizeof(dma_addr_t),
 459                                                      GFP_KERNEL);
 460                 if (!ppgtt->gen8_pt_dma_addr[i])
 461                         return -ENOMEM;
 462         }
 463
 464         return 0;
 465 }
 466
 467 static int gen8_ppgtt_allocate_page_directories(struct i915_hw_ppgtt *ppgtt,
 468                                                 const int max_pdp)
 469 {
 470         ppgtt->pd_pages = alloc_pages(GFP_KERNEL, get_order(max_pdp << PAGE_SHIFT));
 471         if (!ppgtt->pd_pages)
 472                 return -ENOMEM;
 473
 474         ppgtt->num_pd_pages = 1 << get_order(max_pdp << PAGE_SHIFT);
 475         BUG_ON(ppgtt->num_pd_pages > GEN8_LEGACY_PDPS);
 476
 477         return 0;
 478 }
 479
 480 static int gen8_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt,
 481                             const int max_pdp)
 482 {
 483         int ret;
 484
 485         ret = gen8_ppgtt_allocate_page_directories(ppgtt, max_pdp);
 486         if (ret)
 487                 return ret;
 488
 489         ret = gen8_ppgtt_allocate_page_tables(ppgtt, max_pdp);
 490         if (ret) {
 491                 __free_pages(ppgtt->pd_pages, get_order(max_pdp << PAGE_SHIFT));
 492                 return ret;
 493         }
 494
 495         ppgtt->num_pd_entries = max_pdp * GEN8_PDES_PER_PAGE;
 496
 497         ret = gen8_ppgtt_allocate_dma(ppgtt);
 498         if (ret)
 499                 gen8_ppgtt_free(ppgtt);
 500
 501         return ret;
 502 }
 503
 504 static int gen8_ppgtt_setup_page_directories(struct i915_hw_ppgtt *ppgtt,
 505                                              const int pd)
 506 {
 507         dma_addr_t pd_addr;
 508         int ret;
 509
 510         pd_addr = pci_map_page(ppgtt->base.dev->pdev,
 511                                &ppgtt->pd_pages[pd], 0,
 512                                PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 513
 514         ret = pci_dma_mapping_error(ppgtt->base.dev->pdev, pd_addr);
 515         if (ret)
 516                 return ret;
 517
 518         ppgtt->pd_dma_addr[pd] = pd_addr;
 519
 520         return 0;
 521 }
 522
 523 static int gen8_ppgtt_setup_page_tables(struct i915_hw_ppgtt *ppgtt,
 524                                         const int pd,
 525                                         const int pt)
 526 {
 527         dma_addr_t pt_addr;
 528         struct page *p;
 529         int ret;
 530
 531         p = ppgtt->gen8_pt_pages[pd][pt];
 532         pt_addr = pci_map_page(ppgtt->base.dev->pdev,
 533                                p, 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 534         ret = pci_dma_mapping_error(ppgtt->base.dev->pdev, pt_addr);
 535         if (ret)
 536                 return ret;
 537
 538         ppgtt->gen8_pt_dma_addr[pd][pt] = pt_addr;
 539
 540         return 0;
 541 }
 542
 543 /**
 544  * GEN8 legacy ppgtt programming is accomplished through a max 4 PDP registers
 545  * with a net effect resembling a 2-level page table in normal x86 terms. Each
 546  * PDP represents 1GB of memory 4 * 512 * 512 * 4096 = 4GB legacy 32b address
 547  * space.
 548  *
 549  * FIXME: split allocation into smaller pieces. For now we only ever do this
 550  * once, but with full PPGTT, the multiple contiguous allocations will be bad.
 551  * TODO: Do something with the size parameter
 552  */
 553 static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size)
 554 {
 555         const int max_pdp = DIV_ROUND_UP(size, 1 << 30);
 556         const int min_pt_pages = GEN8_PDES_PER_PAGE * max_pdp;
 557         int i, j, ret;
 558
 559         if (size % (1<<30))
 560                 DRM_INFO("Pages will be wasted unless GTT size (%llu) is divisible by 1GB\n", size);
 561
 562         /* 1. Do all our allocations for page directories and page tables. */
 563         ret = gen8_ppgtt_alloc(ppgtt, max_pdp);
 564         if (ret)
 565                 return ret;
 566
 567         /*
 568          * 2. Create DMA mappings for the page directories and page tables.
 569          */
 570         for (i = 0; i < max_pdp; i++) {
 571                 ret = gen8_ppgtt_setup_page_directories(ppgtt, i);
 572                 if (ret)
 573                         goto bail;
 574
 575                 for (j = 0; j < GEN8_PDES_PER_PAGE; j++) {
 576                         ret = gen8_ppgtt_setup_page_tables(ppgtt, i, j);
 577                         if (ret)
 578                                 goto bail;
 579                 }
 580         }
 581
 582         /*
 583          * 3. Map all the page directory entires to point to the page tables
 584          * we've allocated.
 585          *
 586          * For now, the PPGTT helper functions all require that the PDEs are
 587          * plugged in correctly. So we do that now/here. For aliasing PPGTT, we
 588          * will never need to touch the PDEs again.
 589          */
 590         for (i = 0; i < max_pdp; i++) {
 591                 gen8_ppgtt_pde_t *pd_vaddr;
 592                 pd_vaddr = kmap_atomic(&ppgtt->pd_pages[i]);
 593                 for (j = 0; j < GEN8_PDES_PER_PAGE; j++) {
 594                         dma_addr_t addr = ppgtt->gen8_pt_dma_addr[i][j];
 595                         pd_vaddr[j] = gen8_pde_encode(ppgtt->base.dev, addr,
 596                                                       I915_CACHE_LLC);
 597                 }
 598                 if (!HAS_LLC(ppgtt->base.dev))
 599                         drm_clflush_virt_range(pd_vaddr, PAGE_SIZE);
 600                 kunmap_atomic(pd_vaddr);
 601         }
 602
 603         ppgtt->switch_mm = gen8_mm_switch;
 604         ppgtt->base.clear_range = gen8_ppgtt_clear_range;
 605         ppgtt->base.insert_entries = gen8_ppgtt_insert_entries;
 606         ppgtt->base.cleanup = gen8_ppgtt_cleanup;
 607         ppgtt->base.start = 0;
 608         ppgtt->base.total = ppgtt->num_pd_entries * GEN8_PTES_PER_PAGE * PAGE_SIZE;
 609
 610         ppgtt->base.clear_range(&ppgtt->base, 0, ppgtt->base.total, true);
 611
 612         DRM_DEBUG_DRIVER("Allocated %d pages for page directories (%d wasted)\n",
 613                          ppgtt->num_pd_pages, ppgtt->num_pd_pages - max_pdp);
 614         DRM_DEBUG_DRIVER("Allocated %d pages for page tables (%lld wasted)\n",
 615                          ppgtt->num_pd_entries,
 616                          (ppgtt->num_pd_entries - min_pt_pages) + size % (1<<30));
 617         return 0;
 618
 619 bail:
 620         gen8_ppgtt_unmap_pages(ppgtt);
 621         gen8_ppgtt_free(ppgtt);
 622         return ret;
 623 }
 624
 625 static void gen6_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m)
 626 {
 627         struct drm_i915_private *dev_priv = ppgtt->base.dev->dev_private;
 628         struct i915_address_space *vm = &ppgtt->base;
 629         gen6_gtt_pte_t __iomem *pd_addr;
 630         gen6_gtt_pte_t scratch_pte;
 631         uint32_t pd_entry;
 632         int pte, pde;
 633
 634         scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, true, 0);
 635
 636         pd_addr = (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm +
 637                 ppgtt->pd_offset / sizeof(gen6_gtt_pte_t);
 638
 639         seq_printf(m, "  VM %p (pd_offset %x-%x):\n", vm,
 640                    ppgtt->pd_offset, ppgtt->pd_offset + ppgtt->num_pd_entries);
 641         for (pde = 0; pde < ppgtt->num_pd_entries; pde++) {
 642                 u32 expected;
 643                 gen6_gtt_pte_t *pt_vaddr;
 644                 dma_addr_t pt_addr = ppgtt->pt_dma_addr[pde];
 645                 pd_entry = readl(pd_addr + pde);
 646                 expected = (GEN6_PDE_ADDR_ENCODE(pt_addr) | GEN6_PDE_VALID);
 647
 648                 if (pd_entry != expected)
 649                         seq_printf(m, "\tPDE #%d mismatch: Actual PDE: %x Expected PDE: %x\n",
 650                                    pde,
 651                                    pd_entry,
 652                                    expected);
 653                 seq_printf(m, "\tPDE: %x\n", pd_entry);
 654
 655                 pt_vaddr = kmap_atomic(ppgtt->pt_pages[pde]);
 656                 for (pte = 0; pte < I915_PPGTT_PT_ENTRIES; pte+=4) {
 657                         unsigned long va =
 658                                 (pde * PAGE_SIZE * I915_PPGTT_PT_ENTRIES) +
 659                                 (pte * PAGE_SIZE);
 660                         int i;
 661                         bool found = false;
 662                         for (i = 0; i < 4; i++)
 663                                 if (pt_vaddr[pte + i] != scratch_pte)
 664                                         found = true;
 665                         if (!found)
 666                                 continue;
 667
 668                         seq_printf(m, "\t\t0x%lx [%03d,%04d]: =", va, pde, pte);
 669                         for (i = 0; i < 4; i++) {
 670                                 if (pt_vaddr[pte + i] != scratch_pte)
 671                                         seq_printf(m, " %08x", pt_vaddr[pte + i]);
 672                                 else
 673                                         seq_puts(m, "  SCRATCH ");
 674                         }
 675                         seq_puts(m, "\n");
 676                 }
 677                 kunmap_atomic(pt_vaddr);
 678         }
 679 }
 680
 681 static void gen6_write_pdes(struct i915_hw_ppgtt *ppgtt)
 682 {
 683         struct drm_i915_private *dev_priv = ppgtt->base.dev->dev_private;
 684         gen6_gtt_pte_t __iomem *pd_addr;
 685         uint32_t pd_entry;
 686         int i;
 687
 688         WARN_ON(ppgtt->pd_offset & 0x3f);
 689         pd_addr = (gen6_gtt_pte_t __iomem*)dev_priv->gtt.gsm +
 690                 ppgtt->pd_offset / sizeof(gen6_gtt_pte_t);
 691         for (i = 0; i < ppgtt->num_pd_entries; i++) {
 692                 dma_addr_t pt_addr;
 693
 694                 pt_addr = ppgtt->pt_dma_addr[i];
 695                 pd_entry = GEN6_PDE_ADDR_ENCODE(pt_addr);
 696                 pd_entry |= GEN6_PDE_VALID;
 697
 698                 writel(pd_entry, pd_addr + i);
 699         }
 700         readl(pd_addr);
 701 }
 702
 703 static uint32_t get_pd_offset(struct i915_hw_ppgtt *ppgtt)
 704 {
 705         BUG_ON(ppgtt->pd_offset & 0x3f);
 706
 707         return (ppgtt->pd_offset / 64) << 16;
 708 }
 709
 710 static int hsw_mm_switch(struct i915_hw_ppgtt *ppgtt,
 711                          struct intel_engine_cs *ring)
 712 {
 713         int ret;
 714
 715         /* NB: TLBs must be flushed and invalidated before a switch */
 716         ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
 717         if (ret)
 718                 return ret;
 719
 720         ret = intel_ring_begin(ring, 6);
 721         if (ret)
 722                 return ret;
 723
 724         intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(2));
 725         intel_ring_emit(ring, RING_PP_DIR_DCLV(ring));
 726         intel_ring_emit(ring, PP_DIR_DCLV_2G);
 727         intel_ring_emit(ring, RING_PP_DIR_BASE(ring));
 728         intel_ring_emit(ring, get_pd_offset(ppgtt));
 729         intel_ring_emit(ring, MI_NOOP);
 730         intel_ring_advance(ring);
 731
 732         return 0;
 733 }
 734
 735 static int gen7_mm_switch(struct i915_hw_ppgtt *ppgtt,
 736                           struct intel_engine_cs *ring)
 737 {
 738         int ret;
 739
 740         /* NB: TLBs must be flushed and invalidated before a switch */
 741         ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
 742         if (ret)
 743                 return ret;
 744
 745         ret = intel_ring_begin(ring, 6);
 746         if (ret)
 747                 return ret;
 748
 749         intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(2));
 750         intel_ring_emit(ring, RING_PP_DIR_DCLV(ring));
 751         intel_ring_emit(ring, PP_DIR_DCLV_2G);
 752         intel_ring_emit(ring, RING_PP_DIR_BASE(ring));
 753         intel_ring_emit(ring, get_pd_offset(ppgtt));
 754         intel_ring_emit(ring, MI_NOOP);
 755         intel_ring_advance(ring);
 756
 757         /* XXX: RCS is the only one to auto invalidate the TLBs? */
 758         if (ring->id != RCS) {
 759                 ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
 760                 if (ret)
 761                         return ret;
 762         }
 763
 764         return 0;
 765 }
 766
 767 static int gen6_mm_switch(struct i915_hw_ppgtt *ppgtt,
 768                           struct intel_engine_cs *ring)
 769 {
 770         struct drm_device *dev = ppgtt->base.dev;
 771         struct drm_i915_private *dev_priv = dev->dev_private;
 772
 773
 774         I915_WRITE(RING_PP_DIR_DCLV(ring), PP_DIR_DCLV_2G);
 775         I915_WRITE(RING_PP_DIR_BASE(ring), get_pd_offset(ppgtt));
 776
 777         POSTING_READ(RING_PP_DIR_DCLV(ring));
 778
 779         return 0;
 780 }
 781
 782 static void gen8_ppgtt_enable(struct drm_device *dev)
 783 {
 784         struct drm_i915_private *dev_priv = dev->dev_private;
 785         struct intel_engine_cs *ring;
 786         int j;
 787
 788         for_each_ring(ring, dev_priv, j) {
 789                 I915_WRITE(RING_MODE_GEN7(ring),
 790                            _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
 791         }
 792 }
 793
 794 static void gen7_ppgtt_enable(struct drm_device *dev)
 795 {
 796         struct drm_i915_private *dev_priv = dev->dev_private;
 797         struct intel_engine_cs *ring;
 798         uint32_t ecochk, ecobits;
 799         int i;
 800
 801         ecobits = I915_READ(GAC_ECO_BITS);
 802         I915_WRITE(GAC_ECO_BITS, ecobits | ECOBITS_PPGTT_CACHE64B);
 803
 804         ecochk = I915_READ(GAM_ECOCHK);
 805         if (IS_HASWELL(dev)) {
 806                 ecochk |= ECOCHK_PPGTT_WB_HSW;
 807         } else {
 808                 ecochk |= ECOCHK_PPGTT_LLC_IVB;
 809                 ecochk &= ~ECOCHK_PPGTT_GFDT_IVB;
 810         }
 811         I915_WRITE(GAM_ECOCHK, ecochk);
 812
 813         for_each_ring(ring, dev_priv, i) {
 814                 /* GFX_MODE is per-ring on gen7+ */
 815                 I915_WRITE(RING_MODE_GEN7(ring),
 816                            _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
 817         }
 818 }
 819
 820 static void gen6_ppgtt_enable(struct drm_device *dev)
 821 {
 822         struct drm_i915_private *dev_priv = dev->dev_private;
 823         uint32_t ecochk, gab_ctl, ecobits;
 824
 825         ecobits = I915_READ(GAC_ECO_BITS);
 826         I915_WRITE(GAC_ECO_BITS, ecobits | ECOBITS_SNB_BIT |
 827                    ECOBITS_PPGTT_CACHE64B);
 828
 829         gab_ctl = I915_READ(GAB_CTL);
 830         I915_WRITE(GAB_CTL, gab_ctl | GAB_CTL_CONT_AFTER_PAGEFAULT);
 831
 832         ecochk = I915_READ(GAM_ECOCHK);
 833         I915_WRITE(GAM_ECOCHK, ecochk | ECOCHK_SNB_BIT | ECOCHK_PPGTT_CACHE64B);
 834
 835         I915_WRITE(GFX_MODE, _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
 836 }
 837
 838 /* PPGTT support for Sandybdrige/Gen6 and later */
 839 static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
 840                                    uint64_t start,
 841                                    uint64_t length,
 842                                    bool use_scratch)
 843 {
 844         struct i915_hw_ppgtt *ppgtt =
 845                 container_of(vm, struct i915_hw_ppgtt, base);
 846         gen6_gtt_pte_t *pt_vaddr, scratch_pte;
 847         unsigned first_entry = start >> PAGE_SHIFT;
 848         unsigned num_entries = length >> PAGE_SHIFT;
 849         unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
 850         unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;
 851         unsigned last_pte, i;
 852
 853         scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, true, 0);
 854
 855         while (num_entries) {
 856                 last_pte = first_pte + num_entries;
 857                 if (last_pte > I915_PPGTT_PT_ENTRIES)
 858                         last_pte = I915_PPGTT_PT_ENTRIES;
 859
 860                 pt_vaddr = kmap_atomic(ppgtt->pt_pages[act_pt]);
 861
 862                 for (i = first_pte; i < last_pte; i++)
 863                         pt_vaddr[i] = scratch_pte;
 864
 865                 kunmap_atomic(pt_vaddr);
 866
 867                 num_entries -= last_pte - first_pte;
 868                 first_pte = 0;
 869                 act_pt++;
 870         }
 871 }
 872
 873 static void gen6_ppgtt_insert_entries(struct i915_address_space *vm,
 874                                       struct sg_table *pages,
 875                                       uint64_t start,
 876                                       enum i915_cache_level cache_level, u32 flags)
 877 {
 878         struct i915_hw_ppgtt *ppgtt =
 879                 container_of(vm, struct i915_hw_ppgtt, base);
 880         gen6_gtt_pte_t *pt_vaddr;
 881         unsigned first_entry = start >> PAGE_SHIFT;
 882         unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
 883         unsigned act_pte = first_entry % I915_PPGTT_PT_ENTRIES;
 884         struct sg_page_iter sg_iter;
 885
 886         pt_vaddr = NULL;
 887         for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) {
 888                 if (pt_vaddr == NULL)
 889                         pt_vaddr = kmap_atomic(ppgtt->pt_pages[act_pt]);
 890
 891                 pt_vaddr[act_pte] =
 892                         vm->pte_encode(sg_page_iter_dma_address(&sg_iter),
 893                                        cache_level, true, flags);
 894
 895                 if (++act_pte == I915_PPGTT_PT_ENTRIES) {
 896                         kunmap_atomic(pt_vaddr);
 897                         pt_vaddr = NULL;
 898                         act_pt++;
 899                         act_pte = 0;
 900                 }
 901         }
 902         if (pt_vaddr)
 903                 kunmap_atomic(pt_vaddr);
 904 }
 905
 906 static void gen6_ppgtt_unmap_pages(struct i915_hw_ppgtt *ppgtt)
 907 {
 908         int i;
 909
 910         if (ppgtt->pt_dma_addr) {
 911                 for (i = 0; i < ppgtt->num_pd_entries; i++)
 912                         pci_unmap_page(ppgtt->base.dev->pdev,
 913                                        ppgtt->pt_dma_addr[i],
 914                                        4096, PCI_DMA_BIDIRECTIONAL);
 915         }
 916 }
 917
 918 static void gen6_ppgtt_free(struct i915_hw_ppgtt *ppgtt)
 919 {
 920         int i;
 921
 922         kfree(ppgtt->pt_dma_addr);
 923         for (i = 0; i < ppgtt->num_pd_entries; i++)
 924                 __free_page(ppgtt->pt_pages[i]);
 925         kfree(ppgtt->pt_pages);
 926 }
 927
 928 static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
 929 {
 930         struct i915_hw_ppgtt *ppgtt =
 931                 container_of(vm, struct i915_hw_ppgtt, base);
 932
 933         drm_mm_remove_node(&ppgtt->node);
 934
 935         gen6_ppgtt_unmap_pages(ppgtt);
 936         gen6_ppgtt_free(ppgtt);
 937 }
 938
 939 static int gen6_ppgtt_allocate_page_directories(struct i915_hw_ppgtt *ppgtt)
 940 {
 941         struct drm_device *dev = ppgtt->base.dev;
 942         struct drm_i915_private *dev_priv = dev->dev_private;
 943         bool retried = false;
 944         int ret;
 945
 946         /* PPGTT PDEs reside in the GGTT and consists of 512 entries. The
 947          * allocator works in address space sizes, so it's multiplied by page
 948          * size. We allocate at the top of the GTT to avoid fragmentation.
 949          */
 950         BUG_ON(!drm_mm_initialized(&dev_priv->gtt.base.mm));
 951 alloc:
 952         ret = drm_mm_insert_node_in_range_generic(&dev_priv->gtt.base.mm,
 953                                                   &ppgtt->node, GEN6_PD_SIZE,
 954                                                   GEN6_PD_ALIGN, 0,
 955                                                   0, dev_priv->gtt.base.total,
 956                                                   DRM_MM_TOPDOWN);
 957         if (ret == -ENOSPC && !retried) {
 958                 ret = i915_gem_evict_something(dev, &dev_priv->gtt.base,
 959                                                GEN6_PD_SIZE, GEN6_PD_ALIGN,
 960                                                I915_CACHE_NONE,
 961                                                0, dev_priv->gtt.base.total,
 962                                                0);
 963                 if (ret)
 964                         return ret;
 965
 966                 retried = true;
 967                 goto alloc;
 968         }
 969
 970         if (ppgtt->node.start < dev_priv->gtt.mappable_end)
 971                 DRM_DEBUG("Forced to use aperture for PDEs\n");
 972
 973         ppgtt->num_pd_entries = GEN6_PPGTT_PD_ENTRIES;
 974         return ret;
 975 }
 976
 977 static int gen6_ppgtt_allocate_page_tables(struct i915_hw_ppgtt *ppgtt)
 978 {
 979         int i;
 980
 981         ppgtt->pt_pages = kcalloc(ppgtt->num_pd_entries, sizeof(struct page *),
 982                                   GFP_KERNEL);
 983
 984         if (!ppgtt->pt_pages)
 985                 return -ENOMEM;
 986
 987         for (i = 0; i < ppgtt->num_pd_entries; i++) {
 988                 ppgtt->pt_pages[i] = alloc_page(GFP_KERNEL);
 989                 if (!ppgtt->pt_pages[i]) {
 990                         gen6_ppgtt_free(ppgtt);
 991                         return -ENOMEM;
 992                 }
 993         }
 994
 995         return 0;
 996 }
 997
 998 static int gen6_ppgtt_alloc(struct i915_hw_ppgtt *ppgtt)
 999 {
1000         int ret;
1001
1002         ret = gen6_ppgtt_allocate_page_directories(ppgtt);
1003         if (ret)
1004                 return ret;
1005
1006         ret = gen6_ppgtt_allocate_page_tables(ppgtt);
1007         if (ret) {
1008                 drm_mm_remove_node(&ppgtt->node);
1009                 return ret;
1010         }
1011
1012         ppgtt->pt_dma_addr = kcalloc(ppgtt->num_pd_entries, sizeof(dma_addr_t),
1013                                      GFP_KERNEL);
1014         if (!ppgtt->pt_dma_addr) {
1015                 drm_mm_remove_node(&ppgtt->node);
1016                 gen6_ppgtt_free(ppgtt);
1017                 return -ENOMEM;
1018         }
1019
1020         return 0;
1021 }
1022
1023 static int gen6_ppgtt_setup_page_tables(struct i915_hw_ppgtt *ppgtt)
1024 {
1025         struct drm_device *dev = ppgtt->base.dev;
1026         int i;
1027
1028         for (i = 0; i < ppgtt->num_pd_entries; i++) {
1029                 dma_addr_t pt_addr;
1030
1031                 pt_addr = pci_map_page(dev->pdev, ppgtt->pt_pages[i], 0, 4096,
1032                                        PCI_DMA_BIDIRECTIONAL);
1033
1034                 if (pci_dma_mapping_error(dev->pdev, pt_addr)) {
1035                         gen6_ppgtt_unmap_pages(ppgtt);
1036                         return -EIO;
1037                 }
1038
1039                 ppgtt->pt_dma_addr[i] = pt_addr;
1040         }
1041
1042         return 0;
1043 }
1044
1045 static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
1046 {
1047         struct drm_device *dev = ppgtt->base.dev;
1048         struct drm_i915_private *dev_priv = dev->dev_private;
1049         int ret;
1050
1051         ppgtt->base.pte_encode = dev_priv->gtt.base.pte_encode;
1052         if (IS_GEN6(dev)) {
1053                 ppgtt->switch_mm = gen6_mm_switch;
1054         } else if (IS_HASWELL(dev)) {
1055                 ppgtt->switch_mm = hsw_mm_switch;
1056         } else if (IS_GEN7(dev)) {
1057                 ppgtt->switch_mm = gen7_mm_switch;
1058         } else
1059                 BUG();
1060
1061         ret = gen6_ppgtt_alloc(ppgtt);
1062         if (ret)
1063                 return ret;
1064
1065         ret = gen6_ppgtt_setup_page_tables(ppgtt);
1066         if (ret) {
1067                 gen6_ppgtt_free(ppgtt);
1068                 return ret;
1069         }
1070
1071         ppgtt->base.clear_range = gen6_ppgtt_clear_range;
1072         ppgtt->base.insert_entries = gen6_ppgtt_insert_entries;
1073         ppgtt->base.cleanup = gen6_ppgtt_cleanup;
1074         ppgtt->base.start = 0;
1075         ppgtt->base.total =  ppgtt->num_pd_entries * I915_PPGTT_PT_ENTRIES * PAGE_SIZE;
1076         ppgtt->debug_dump = gen6_dump_ppgtt;
1077
1078         ppgtt->pd_offset =
1079                 ppgtt->node.start / PAGE_SIZE * sizeof(gen6_gtt_pte_t);
1080
1081         ppgtt->base.clear_range(&ppgtt->base, 0, ppgtt->base.total, true);
1082
1083         DRM_DEBUG_DRIVER("Allocated pde space (%ldM) at GTT entry: %lx\n",
1084                          ppgtt->node.size >> 20,
1085                          ppgtt->node.start / PAGE_SIZE);
1086
1087         gen6_write_pdes(ppgtt);
1088         DRM_DEBUG("Adding PPGTT at offset %x\n",
1089                   ppgtt->pd_offset << 10);
1090
1091         return 0;
1092 }
1093
1094 static int __hw_ppgtt_init(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
1095 {
1096         struct drm_i915_private *dev_priv = dev->dev_private;
1097
1098         ppgtt->base.dev = dev;
1099         ppgtt->base.scratch = dev_priv->gtt.base.scratch;
1100
1101         if (INTEL_INFO(dev)->gen < 8)
1102                 return gen6_ppgtt_init(ppgtt);
1103         else if (IS_GEN8(dev) || IS_GEN9(dev))
1104                 return gen8_ppgtt_init(ppgtt, dev_priv->gtt.base.total);
1105         else
1106                 BUG();
1107 }
1108 int i915_ppgtt_init(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
1109 {
1110         struct drm_i915_private *dev_priv = dev->dev_private;
1111         int ret = 0;
1112
1113         ret = __hw_ppgtt_init(dev, ppgtt);
1114         if (ret == 0) {
1115                 kref_init(&ppgtt->ref);
1116                 drm_mm_init(&ppgtt->base.mm, ppgtt->base.start,
1117                             ppgtt->base.total);
1118                 i915_init_vm(dev_priv, &ppgtt->base);
1119         }
1120
1121         return ret;
1122 }
1123
1124 int i915_ppgtt_init_hw(struct drm_device *dev)
1125 {
1126         struct drm_i915_private *dev_priv = dev->dev_private;
1127         struct intel_engine_cs *ring;
1128         struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
1129         int i, ret = 0;
1130
1131         /* In the case of execlists, PPGTT is enabled by the context descriptor
1132          * and the PDPs are contained within the context itself.  We don't
1133          * need to do anything here. */
1134         if (i915.enable_execlists)
1135                 return 0;
1136
1137         if (!USES_PPGTT(dev))
1138                 return 0;
1139
1140         if (IS_GEN6(dev))
1141                 gen6_ppgtt_enable(dev);
1142         else if (IS_GEN7(dev))
1143                 gen7_ppgtt_enable(dev);
1144         else if (INTEL_INFO(dev)->gen >= 8)
1145                 gen8_ppgtt_enable(dev);
1146         else
1147                 WARN_ON(1);
1148
1149         if (ppgtt) {
1150                 for_each_ring(ring, dev_priv, i) {
1151                         ret = ppgtt->switch_mm(ppgtt, ring);
1152                         if (ret != 0)
1153                                 return ret;
1154                 }
1155         }
1156
1157         return ret;
1158 }
1159 struct i915_hw_ppgtt *
1160 i915_ppgtt_create(struct drm_device *dev, struct drm_i915_file_private *fpriv)
1161 {
1162         struct i915_hw_ppgtt *ppgtt;
1163         int ret;
1164
1165         ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);
1166         if (!ppgtt)
1167                 return ERR_PTR(-ENOMEM);
1168
1169         ret = i915_ppgtt_init(dev, ppgtt);
1170         if (ret) {
1171                 kfree(ppgtt);
1172                 return ERR_PTR(ret);
1173         }
1174
1175         ppgtt->file_priv = fpriv;
1176
1177         return ppgtt;
1178 }
1179
1180 void  i915_ppgtt_release(struct kref *kref)
1181 {
1182         struct i915_hw_ppgtt *ppgtt =
1183                 container_of(kref, struct i915_hw_ppgtt, ref);
1184
1185         /* vmas should already be unbound */
1186         WARN_ON(!list_empty(&ppgtt->base.active_list));
1187         WARN_ON(!list_empty(&ppgtt->base.inactive_list));
1188
1189         list_del(&ppgtt->base.global_link);
1190         drm_mm_takedown(&ppgtt->base.mm);
1191
1192         ppgtt->base.cleanup(&ppgtt->base);
1193         kfree(ppgtt);
1194 }
1195
1196 static void
1197 ppgtt_bind_vma(struct i915_vma *vma,
1198                enum i915_cache_level cache_level,
1199                u32 flags)
1200 {
1201         /* Currently applicable only to VLV */
1202         if (vma->obj->gt_ro)
1203                 flags |= PTE_READ_ONLY;
1204
1205         vma->vm->insert_entries(vma->vm, vma->obj->pages, vma->node.start,
1206                                 cache_level, flags);
1207 }
1208
1209 static void ppgtt_unbind_vma(struct i915_vma *vma)
1210 {
1211         vma->vm->clear_range(vma->vm,
1212                              vma->node.start,
1213                              vma->obj->base.size,
1214                              true);
1215 }
1216
1217 extern int intel_iommu_gfx_mapped;
1218 /* Certain Gen5 chipsets require require idling the GPU before
1219  * unmapping anything from the GTT when VT-d is enabled.
1220  */
1221 static inline bool needs_idle_maps(struct drm_device *dev)
1222 {
1223 #ifdef CONFIG_INTEL_IOMMU
1224         /* Query intel_iommu to see if we need the workaround. Presumably that
1225          * was loaded first.
1226          */
1227         if (IS_GEN5(dev) && IS_MOBILE(dev) && intel_iommu_gfx_mapped)
1228                 return true;
1229 #endif
1230         return false;
1231 }
1232
1233 static bool do_idling(struct drm_i915_private *dev_priv)
1234 {
1235         bool ret = dev_priv->mm.interruptible;
1236
1237         if (unlikely(dev_priv->gtt.do_idle_maps)) {
1238                 dev_priv->mm.interruptible = false;
1239                 if (i915_gpu_idle(dev_priv->dev)) {
1240                         DRM_ERROR("Couldn't idle GPU\n");
1241                         /* Wait a bit, in hopes it avoids the hang */
1242                         udelay(10);
1243                 }
1244         }
1245
1246         return ret;
1247 }
1248
1249 static void undo_idling(struct drm_i915_private *dev_priv, bool interruptible)
1250 {
1251         if (unlikely(dev_priv->gtt.do_idle_maps))
1252                 dev_priv->mm.interruptible = interruptible;
1253 }
1254
1255 void i915_check_and_clear_faults(struct drm_device *dev)
1256 {
1257         struct drm_i915_private *dev_priv = dev->dev_private;
1258         struct intel_engine_cs *ring;
1259         int i;
1260
1261         if (INTEL_INFO(dev)->gen < 6)
1262                 return;
1263
1264         for_each_ring(ring, dev_priv, i) {
1265                 u32 fault_reg;
1266                 fault_reg = I915_READ(RING_FAULT_REG(ring));
1267                 if (fault_reg & RING_FAULT_VALID) {
1268                         DRM_DEBUG_DRIVER("Unexpected fault\n"
1269                                          "\tAddr: 0x%08lx\\n"
1270                                          "\tAddress space: %s\n"
1271                                          "\tSource ID: %d\n"
1272                                          "\tType: %d\n",
1273                                          fault_reg & PAGE_MASK,
1274                                          fault_reg & RING_FAULT_GTTSEL_MASK ? "GGTT" : "PPGTT",
1275                                          RING_FAULT_SRCID(fault_reg),
1276                                          RING_FAULT_FAULT_TYPE(fault_reg));
1277                         I915_WRITE(RING_FAULT_REG(ring),
1278                                    fault_reg & ~RING_FAULT_VALID);
1279                 }
1280         }
1281         POSTING_READ(RING_FAULT_REG(&dev_priv->ring[RCS]));
1282 }
1283
1284 void i915_gem_suspend_gtt_mappings(struct drm_device *dev)
1285 {
1286         struct drm_i915_private *dev_priv = dev->dev_private;
1287
1288         /* Don't bother messing with faults pre GEN6 as we have little
1289          * documentation supporting that it's a good idea.
1290          */
1291         if (INTEL_INFO(dev)->gen < 6)
1292                 return;
1293
1294         i915_check_and_clear_faults(dev);
1295
1296         dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
1297                                        dev_priv->gtt.base.start,
1298                                        dev_priv->gtt.base.total,
1299                                        true);
1300 }
1301
1302 void i915_gem_restore_gtt_mappings(struct drm_device *dev)
1303 {
1304         struct drm_i915_private *dev_priv = dev->dev_private;
1305         struct drm_i915_gem_object *obj;
1306         struct i915_address_space *vm;
1307
1308         i915_check_and_clear_faults(dev);
1309
1310         /* First fill our portion of the GTT with scratch pages */
1311         dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
1312                                        dev_priv->gtt.base.start,
1313                                        dev_priv->gtt.base.total,
1314                                        true);
1315
1316         list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
1317                 struct i915_vma *vma = i915_gem_obj_to_vma(obj,
1318                                                            &dev_priv->gtt.base);
1319                 if (!vma)
1320                         continue;
1321
1322                 i915_gem_clflush_object(obj, obj->pin_display);
1323                 /* The bind_vma code tries to be smart about tracking mappings.
1324                  * Unfortunately above, we've just wiped out the mappings
1325                  * without telling our object about it. So we need to fake it.
1326                  */
1327                 obj->has_global_gtt_mapping = 0;
1328                 vma->bind_vma(vma, obj->cache_level, GLOBAL_BIND);
1329         }
1330
1331
1332         if (INTEL_INFO(dev)->gen >= 8) {
1333                 if (IS_CHERRYVIEW(dev))
1334                         chv_setup_private_ppat(dev_priv);
1335                 else
1336                         bdw_setup_private_ppat(dev_priv);
1337
1338                 return;
1339         }
1340
1341         list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
1342                 /* TODO: Perhaps it shouldn't be gen6 specific */
1343                 if (i915_is_ggtt(vm)) {
1344                         if (dev_priv->mm.aliasing_ppgtt)
1345                                 gen6_write_pdes(dev_priv->mm.aliasing_ppgtt);
1346                         continue;
1347                 }
1348
1349                 gen6_write_pdes(container_of(vm, struct i915_hw_ppgtt, base));
1350         }
1351
1352         i915_gem_chipset_flush(dev);
1353 }
1354
1355 int i915_gem_gtt_prepare_object(struct drm_i915_gem_object *obj)
1356 {
1357         if (obj->has_dma_mapping)
1358                 return 0;
1359
1360         if (!dma_map_sg(&obj->base.dev->pdev->dev,
1361                         obj->pages->sgl, obj->pages->nents,
1362                         PCI_DMA_BIDIRECTIONAL))
1363                 return -ENOSPC;
1364
1365         return 0;
1366 }
1367
1368 static inline void gen8_set_pte(void __iomem *addr, gen8_gtt_pte_t pte)
1369 {
1370 #ifdef writeq
1371         writeq(pte, addr);
1372 #else
1373         iowrite32((u32)pte, addr);
1374         iowrite32(pte >> 32, addr + 4);
1375 #endif
1376 }
1377
1378 static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
1379                                      struct sg_table *st,
1380                                      uint64_t start,
1381                                      enum i915_cache_level level, u32 unused)
1382 {
1383         struct drm_i915_private *dev_priv = vm->dev->dev_private;
1384         unsigned first_entry = start >> PAGE_SHIFT;
1385         gen8_gtt_pte_t __iomem *gtt_entries =
1386                 (gen8_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
1387         int i = 0;
1388         struct sg_page_iter sg_iter;
1389         dma_addr_t addr = 0; /* shut up gcc */
1390
1391         for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) {
1392                 addr = sg_dma_address(sg_iter.sg) +
1393                         (sg_iter.sg_pgoffset << PAGE_SHIFT);
1394                 gen8_set_pte(&gtt_entries[i],
1395                              gen8_pte_encode(addr, level, true));
1396                 i++;
1397         }
1398
1399         /*
1400          * XXX: This serves as a posting read to make sure that the PTE has
1401          * actually been updated. There is some concern that even though
1402          * registers and PTEs are within the same BAR that they are potentially
1403          * of NUMA access patterns. Therefore, even with the way we assume
1404          * hardware should work, we must keep this posting read for paranoia.
1405          */
1406         if (i != 0)
1407                 WARN_ON(readq(&gtt_entries[i-1])
1408                         != gen8_pte_encode(addr, level, true));
1409
1410         /* This next bit makes the above posting read even more important. We
1411          * want to flush the TLBs only after we're certain all the PTE updates
1412          * have finished.
1413          */
1414         I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
1415         POSTING_READ(GFX_FLSH_CNTL_GEN6);
1416 }
1417
1418 /*
1419  * Binds an object into the global gtt with the specified cache level. The object
1420  * will be accessible to the GPU via commands whose operands reference offsets
1421  * within the global GTT as well as accessible by the GPU through the GMADR
1422  * mapped BAR (dev_priv->mm.gtt->gtt).
1423  */
1424 static void gen6_ggtt_insert_entries(struct i915_address_space *vm,
1425                                      struct sg_table *st,
1426                                      uint64_t start,
1427                                      enum i915_cache_level level, u32 flags)
1428 {
1429         struct drm_i915_private *dev_priv = vm->dev->dev_private;
1430         unsigned first_entry = start >> PAGE_SHIFT;
1431         gen6_gtt_pte_t __iomem *gtt_entries =
1432                 (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
1433         int i = 0;
1434         struct sg_page_iter sg_iter;
1435         dma_addr_t addr = 0;
1436
1437         for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) {
1438                 addr = sg_page_iter_dma_address(&sg_iter);
1439                 iowrite32(vm->pte_encode(addr, level, true, flags), &gtt_entries[i]);
1440                 i++;
1441         }
1442
1443         /* XXX: This serves as a posting read to make sure that the PTE has
1444          * actually been updated. There is some concern that even though
1445          * registers and PTEs are within the same BAR that they are potentially
1446          * of NUMA access patterns. Therefore, even with the way we assume
1447          * hardware should work, we must keep this posting read for paranoia.
1448          */
1449         if (i != 0) {
1450                 unsigned long gtt = readl(&gtt_entries[i-1]);
1451                 WARN_ON(gtt != vm->pte_encode(addr, level, true, flags));
1452         }
1453
1454         /* This next bit makes the above posting read even more important. We
1455          * want to flush the TLBs only after we're certain all the PTE updates
1456          * have finished.
1457          */
1458         I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
1459         POSTING_READ(GFX_FLSH_CNTL_GEN6);
1460 }
1461
1462 static void gen8_ggtt_clear_range(struct i915_address_space *vm,
1463                                   uint64_t start,
1464                                   uint64_t length,
1465                                   bool use_scratch)
1466 {
1467         struct drm_i915_private *dev_priv = vm->dev->dev_private;
1468         unsigned first_entry = start >> PAGE_SHIFT;
1469         unsigned num_entries = length >> PAGE_SHIFT;
1470         gen8_gtt_pte_t scratch_pte, __iomem *gtt_base =
1471                 (gen8_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
1472         const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
1473         int i;
1474
1475         if (WARN(num_entries > max_entries,
1476                  "First entry = %d; Num entries = %d (max=%d)\n",
1477                  first_entry, num_entries, max_entries))
1478                 num_entries = max_entries;
1479
1480         scratch_pte = gen8_pte_encode(vm->scratch.addr,
1481                                       I915_CACHE_LLC,
1482                                       use_scratch);
1483         for (i = 0; i < num_entries; i++)
1484                 gen8_set_pte(&gtt_base[i], scratch_pte);
1485         readl(gtt_base);
1486 }
1487
1488 static void gen6_ggtt_clear_range(struct i915_address_space *vm,
1489                                   uint64_t start,
1490                                   uint64_t length,
1491                                   bool use_scratch)
1492 {
1493         struct drm_i915_private *dev_priv = vm->dev->dev_private;
1494         unsigned first_entry = start >> PAGE_SHIFT;
1495         unsigned num_entries = length >> PAGE_SHIFT;
1496         gen6_gtt_pte_t scratch_pte, __iomem *gtt_base =
1497                 (gen6_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
1498         const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
1499         int i;
1500
1501         if (WARN(num_entries > max_entries,
1502                  "First entry = %d; Num entries = %d (max=%d)\n",
1503                  first_entry, num_entries, max_entries))
1504                 num_entries = max_entries;
1505
1506         scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, use_scratch, 0);
1507
1508         for (i = 0; i < num_entries; i++)
1509                 iowrite32(scratch_pte, &gtt_base[i]);
1510         readl(gtt_base);
1511 }
1512
1513
1514 static void i915_ggtt_bind_vma(struct i915_vma *vma,
1515                                enum i915_cache_level cache_level,
1516                                u32 unused)
1517 {
1518         const unsigned long entry = vma->node.start >> PAGE_SHIFT;
1519         unsigned int flags = (cache_level == I915_CACHE_NONE) ?
1520                 AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
1521
1522         BUG_ON(!i915_is_ggtt(vma->vm));
1523         intel_gtt_insert_sg_entries(vma->obj->pages, entry, flags);
1524         vma->obj->has_global_gtt_mapping = 1;
1525 }
1526
1527 static void i915_ggtt_clear_range(struct i915_address_space *vm,
1528                                   uint64_t start,
1529                                   uint64_t length,
1530                                   bool unused)
1531 {
1532         unsigned first_entry = start >> PAGE_SHIFT;
1533         unsigned num_entries = length >> PAGE_SHIFT;
1534         intel_gtt_clear_range(first_entry, num_entries);
1535 }
1536
1537 static void i915_ggtt_unbind_vma(struct i915_vma *vma)
1538 {
1539         const unsigned int first = vma->node.start >> PAGE_SHIFT;
1540         const unsigned int size = vma->obj->base.size >> PAGE_SHIFT;
1541
1542         BUG_ON(!i915_is_ggtt(vma->vm));
1543         vma->obj->has_global_gtt_mapping = 0;
1544         intel_gtt_clear_range(first, size);
1545 }
1546
1547 static void ggtt_bind_vma(struct i915_vma *vma,
1548                           enum i915_cache_level cache_level,
1549                           u32 flags)
1550 {
1551         struct drm_device *dev = vma->vm->dev;
1552         struct drm_i915_private *dev_priv = dev->dev_private;
1553         struct drm_i915_gem_object *obj = vma->obj;
1554
1555         /* Currently applicable only to VLV */
1556         if (obj->gt_ro)
1557                 flags |= PTE_READ_ONLY;
1558
1559         /* If there is no aliasing PPGTT, or the caller needs a global mapping,
1560          * or we have a global mapping already but the cacheability flags have
1561          * changed, set the global PTEs.
1562          *
1563          * If there is an aliasing PPGTT it is anecdotally faster, so use that
1564          * instead if none of the above hold true.
1565          *
1566          * NB: A global mapping should only be needed for special regions like
1567          * "gtt mappable", SNB errata, or if specified via special execbuf
1568          * flags. At all other times, the GPU will use the aliasing PPGTT.
1569          */
1570         if (!dev_priv->mm.aliasing_ppgtt || flags & GLOBAL_BIND) {
1571                 if (!obj->has_global_gtt_mapping ||
1572                     (cache_level != obj->cache_level)) {
1573                         vma->vm->insert_entries(vma->vm, obj->pages,
1574                                                 vma->node.start,
1575                                                 cache_level, flags);
1576                         obj->has_global_gtt_mapping = 1;
1577                 }
1578         }
1579
1580         if (dev_priv->mm.aliasing_ppgtt &&
1581             (!obj->has_aliasing_ppgtt_mapping ||
1582              (cache_level != obj->cache_level))) {
1583                 struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt;
1584                 appgtt->base.insert_entries(&appgtt->base,
1585                                             vma->obj->pages,
1586                                             vma->node.start,
1587                                             cache_level, flags);
1588                 vma->obj->has_aliasing_ppgtt_mapping = 1;
1589         }
1590 }
1591
1592 static void ggtt_unbind_vma(struct i915_vma *vma)
1593 {
1594         struct drm_device *dev = vma->vm->dev;
1595         struct drm_i915_private *dev_priv = dev->dev_private;
1596         struct drm_i915_gem_object *obj = vma->obj;
1597
1598         if (obj->has_global_gtt_mapping) {
1599                 vma->vm->clear_range(vma->vm,
1600                                      vma->node.start,
1601                                      obj->base.size,
1602                                      true);
1603                 obj->has_global_gtt_mapping = 0;
1604         }
1605
1606         if (obj->has_aliasing_ppgtt_mapping) {
1607                 struct i915_hw_ppgtt *appgtt = dev_priv->mm.aliasing_ppgtt;
1608                 appgtt->base.clear_range(&appgtt->base,
1609                                          vma->node.start,
1610                                          obj->base.size,
1611                                          true);
1612                 obj->has_aliasing_ppgtt_mapping = 0;
1613         }
1614 }
1615
1616 void i915_gem_gtt_finish_object(struct drm_i915_gem_object *obj)
1617 {
1618         struct drm_device *dev = obj->base.dev;
1619         struct drm_i915_private *dev_priv = dev->dev_private;
1620         bool interruptible;
1621
1622         interruptible = do_idling(dev_priv);
1623
1624         if (!obj->has_dma_mapping)
1625                 dma_unmap_sg(&dev->pdev->dev,
1626                              obj->pages->sgl, obj->pages->nents,
1627                              PCI_DMA_BIDIRECTIONAL);
1628
1629         undo_idling(dev_priv, interruptible);
1630 }
1631
1632 static void i915_gtt_color_adjust(struct drm_mm_node *node,
1633                                   unsigned long color,
1634                                   unsigned long *start,
1635                                   unsigned long *end)
1636 {
1637         if (node->color != color)
1638                 *start += 4096;
1639
1640         if (!list_empty(&node->node_list)) {
1641                 node = list_entry(node->node_list.next,
1642                                   struct drm_mm_node,
1643                                   node_list);
1644                 if (node->allocated && node->color != color)
1645                         *end -= 4096;
1646         }
1647 }
1648
1649 int i915_gem_setup_global_gtt(struct drm_device *dev,
1650                               unsigned long start,
1651                               unsigned long mappable_end,
1652                               unsigned long end)
1653 {
1654         /* Let GEM Manage all of the aperture.
1655          *
1656          * However, leave one page at the end still bound to the scratch page.
1657          * There are a number of places where the hardware apparently prefetches
1658          * past the end of the object, and we've seen multiple hangs with the
1659          * GPU head pointer stuck in a batchbuffer bound at the last page of the
1660          * aperture.  One page should be enough to keep any prefetching inside
1661          * of the aperture.
1662          */
1663         struct drm_i915_private *dev_priv = dev->dev_private;
1664         struct i915_address_space *ggtt_vm = &dev_priv->gtt.base;
1665         struct drm_mm_node *entry;
1666         struct drm_i915_gem_object *obj;
1667         unsigned long hole_start, hole_end;
1668         int ret;
1669
1670         BUG_ON(mappable_end > end);
1671
1672         /* Subtract the guard page ... */
1673         drm_mm_init(&ggtt_vm->mm, start, end - start - PAGE_SIZE);
1674         if (!HAS_LLC(dev))
1675                 dev_priv->gtt.base.mm.color_adjust = i915_gtt_color_adjust;
1676
1677         /* Mark any preallocated objects as occupied */
1678         list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
1679                 struct i915_vma *vma = i915_gem_obj_to_vma(obj, ggtt_vm);
1680
1681                 DRM_DEBUG_KMS("reserving preallocated space: %lx + %zx\n",
1682                               i915_gem_obj_ggtt_offset(obj), obj->base.size);
1683
1684                 WARN_ON(i915_gem_obj_ggtt_bound(obj));
1685                 ret = drm_mm_reserve_node(&ggtt_vm->mm, &vma->node);
1686                 if (ret) {
1687                         DRM_DEBUG_KMS("Reservation failed: %i\n", ret);
1688                         return ret;
1689                 }
1690                 obj->has_global_gtt_mapping = 1;
1691         }
1692
1693         dev_priv->gtt.base.start = start;
1694         dev_priv->gtt.base.total = end - start;
1695
1696         /* Clear any non-preallocated blocks */
1697         drm_mm_for_each_hole(entry, &ggtt_vm->mm, hole_start, hole_end) {
1698                 DRM_DEBUG_KMS("clearing unused GTT space: [%lx, %lx]\n",
1699                               hole_start, hole_end);
1700                 ggtt_vm->clear_range(ggtt_vm, hole_start,
1701                                      hole_end - hole_start, true);
1702         }
1703
1704         /* And finally clear the reserved guard page */
1705         ggtt_vm->clear_range(ggtt_vm, end - PAGE_SIZE, PAGE_SIZE, true);
1706
1707         if (USES_PPGTT(dev) && !USES_FULL_PPGTT(dev)) {
1708                 struct i915_hw_ppgtt *ppgtt;
1709
1710                 ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);
1711                 if (!ppgtt)
1712                         return -ENOMEM;
1713
1714                 ret = __hw_ppgtt_init(dev, ppgtt);
1715                 if (ret != 0)
1716                         return ret;
1717
1718                 dev_priv->mm.aliasing_ppgtt = ppgtt;
1719         }
1720
1721         return 0;
1722 }
1723
1724 void i915_gem_init_global_gtt(struct drm_device *dev)
1725 {
1726         struct drm_i915_private *dev_priv = dev->dev_private;
1727         unsigned long gtt_size, mappable_size;
1728
1729         gtt_size = dev_priv->gtt.base.total;
1730         mappable_size = dev_priv->gtt.mappable_end;
1731
1732         i915_gem_setup_global_gtt(dev, 0, mappable_size, gtt_size);
1733 }
1734
1735 void i915_global_gtt_cleanup(struct drm_device *dev)
1736 {
1737         struct drm_i915_private *dev_priv = dev->dev_private;
1738         struct i915_address_space *vm = &dev_priv->gtt.base;
1739
1740         if (dev_priv->mm.aliasing_ppgtt) {
1741                 struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
1742
1743                 ppgtt->base.cleanup(&ppgtt->base);
1744         }
1745
1746         if (drm_mm_initialized(&vm->mm)) {
1747                 drm_mm_takedown(&vm->mm);
1748                 list_del(&vm->global_link);
1749         }
1750
1751         vm->cleanup(vm);
1752 }
1753
1754 static int setup_scratch_page(struct drm_device *dev)
1755 {
1756         struct drm_i915_private *dev_priv = dev->dev_private;
1757         struct page *page;
1758         dma_addr_t dma_addr;
1759
1760         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1761         if (page == NULL)
1762                 return -ENOMEM;
1763         set_pages_uc(page, 1);
1764
1765 #ifdef CONFIG_INTEL_IOMMU
1766         dma_addr = pci_map_page(dev->pdev, page, 0, PAGE_SIZE,
1767                                 PCI_DMA_BIDIRECTIONAL);
1768         if (pci_dma_mapping_error(dev->pdev, dma_addr))
1769                 return -EINVAL;
1770 #else
1771         dma_addr = page_to_phys(page);
1772 #endif
1773         dev_priv->gtt.base.scratch.page = page;
1774         dev_priv->gtt.base.scratch.addr = dma_addr;
1775
1776         return 0;
1777 }
1778
1779 static void teardown_scratch_page(struct drm_device *dev)
1780 {
1781         struct drm_i915_private *dev_priv = dev->dev_private;
1782         struct page *page = dev_priv->gtt.base.scratch.page;
1783
1784         set_pages_wb(page, 1);
1785         pci_unmap_page(dev->pdev, dev_priv->gtt.base.scratch.addr,
1786                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
1787         __free_page(page);
1788 }
1789
1790 static inline unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl)
1791 {
1792         snb_gmch_ctl >>= SNB_GMCH_GGMS_SHIFT;
1793         snb_gmch_ctl &= SNB_GMCH_GGMS_MASK;
1794         return snb_gmch_ctl << 20;
1795 }
1796
1797 static inline unsigned int gen8_get_total_gtt_size(u16 bdw_gmch_ctl)
1798 {
1799         bdw_gmch_ctl >>= BDW_GMCH_GGMS_SHIFT;
1800         bdw_gmch_ctl &= BDW_GMCH_GGMS_MASK;
1801         if (bdw_gmch_ctl)
1802                 bdw_gmch_ctl = 1 << bdw_gmch_ctl;
1803
1804 #ifdef CONFIG_X86_32
1805         /* Limit 32b platforms to a 2GB GGTT: 4 << 20 / pte size * PAGE_SIZE */
1806         if (bdw_gmch_ctl > 4)
1807                 bdw_gmch_ctl = 4;
1808 #endif
1809
1810         return bdw_gmch_ctl << 20;
1811 }
1812
1813 static inline unsigned int chv_get_total_gtt_size(u16 gmch_ctrl)
1814 {
1815         gmch_ctrl >>= SNB_GMCH_GGMS_SHIFT;
1816         gmch_ctrl &= SNB_GMCH_GGMS_MASK;
1817
1818         if (gmch_ctrl)
1819                 return 1 << (20 + gmch_ctrl);
1820
1821         return 0;
1822 }
1823
1824 static inline size_t gen6_get_stolen_size(u16 snb_gmch_ctl)
1825 {
1826         snb_gmch_ctl >>= SNB_GMCH_GMS_SHIFT;
1827         snb_gmch_ctl &= SNB_GMCH_GMS_MASK;
1828         return snb_gmch_ctl << 25; /* 32 MB units */
1829 }
1830
1831 static inline size_t gen8_get_stolen_size(u16 bdw_gmch_ctl)
1832 {
1833         bdw_gmch_ctl >>= BDW_GMCH_GMS_SHIFT;
1834         bdw_gmch_ctl &= BDW_GMCH_GMS_MASK;
1835         return bdw_gmch_ctl << 25; /* 32 MB units */
1836 }
1837
1838 static size_t chv_get_stolen_size(u16 gmch_ctrl)
1839 {
1840         gmch_ctrl >>= SNB_GMCH_GMS_SHIFT;
1841         gmch_ctrl &= SNB_GMCH_GMS_MASK;
1842
1843         /*
1844          * 0x0  to 0x10: 32MB increments starting at 0MB
1845          * 0x11 to 0x16: 4MB increments starting at 8MB
1846          * 0x17 to 0x1d: 4MB increments start at 36MB
1847          */
1848         if (gmch_ctrl < 0x11)
1849                 return gmch_ctrl << 25;
1850         else if (gmch_ctrl < 0x17)
1851                 return (gmch_ctrl - 0x11 + 2) << 22;
1852         else
1853                 return (gmch_ctrl - 0x17 + 9) << 22;
1854 }
1855
1856 static size_t gen9_get_stolen_size(u16 gen9_gmch_ctl)
1857 {
1858         gen9_gmch_ctl >>= BDW_GMCH_GMS_SHIFT;
1859         gen9_gmch_ctl &= BDW_GMCH_GMS_MASK;
1860
1861         if (gen9_gmch_ctl < 0xf0)
1862                 return gen9_gmch_ctl << 25; /* 32 MB units */
1863         else
1864                 /* 4MB increments starting at 0xf0 for 4MB */
1865                 return (gen9_gmch_ctl - 0xf0 + 1) << 22;
1866 }
1867
1868 static int ggtt_probe_common(struct drm_device *dev,
1869                              size_t gtt_size)
1870 {
1871         struct drm_i915_private *dev_priv = dev->dev_private;
1872         phys_addr_t gtt_phys_addr;
1873         int ret;
1874
1875         /* For Modern GENs the PTEs and register space are split in the BAR */
1876         gtt_phys_addr = pci_resource_start(dev->pdev, 0) +
1877                 (pci_resource_len(dev->pdev, 0) / 2);
1878
1879         dev_priv->gtt.gsm = ioremap_wc(gtt_phys_addr, gtt_size);
1880         if (!dev_priv->gtt.gsm) {
1881                 DRM_ERROR("Failed to map the gtt page table\n");
1882                 return -ENOMEM;
1883         }
1884
1885         ret = setup_scratch_page(dev);
1886         if (ret) {
1887                 DRM_ERROR("Scratch setup failed\n");
1888                 /* iounmap will also get called at remove, but meh */
1889                 iounmap(dev_priv->gtt.gsm);
1890         }
1891
1892         return ret;
1893 }
1894
1895 /* The GGTT and PPGTT need a private PPAT setup in order to handle cacheability
1896  * bits. When using advanced contexts each context stores its own PAT, but
1897  * writing this data shouldn't be harmful even in those cases. */
1898 static void bdw_setup_private_ppat(struct drm_i915_private *dev_priv)
1899 {
1900         uint64_t pat;
1901
1902         pat = GEN8_PPAT(0, GEN8_PPAT_WB | GEN8_PPAT_LLC)     | /* for normal objects, no eLLC */
1903               GEN8_PPAT(1, GEN8_PPAT_WC | GEN8_PPAT_LLCELLC) | /* for something pointing to ptes? */
1904               GEN8_PPAT(2, GEN8_PPAT_WT | GEN8_PPAT_LLCELLC) | /* for scanout with eLLC */
1905               GEN8_PPAT(3, GEN8_PPAT_UC)                     | /* Uncached objects, mostly for scanout */
1906               GEN8_PPAT(4, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(0)) |
1907               GEN8_PPAT(5, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(1)) |
1908               GEN8_PPAT(6, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(2)) |
1909               GEN8_PPAT(7, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(3));
1910
1911         /* XXX: spec defines this as 2 distinct registers. It's unclear if a 64b
1912          * write would work. */
1913         I915_WRITE(GEN8_PRIVATE_PAT, pat);
1914         I915_WRITE(GEN8_PRIVATE_PAT + 4, pat >> 32);
1915 }
1916
1917 static void chv_setup_private_ppat(struct drm_i915_private *dev_priv)
1918 {
1919         uint64_t pat;
1920
1921         /*
1922          * Map WB on BDW to snooped on CHV.
1923          *
1924          * Only the snoop bit has meaning for CHV, the rest is
1925          * ignored.
1926          *
1927          * Note that the harware enforces snooping for all page
1928          * table accesses. The snoop bit is actually ignored for
1929          * PDEs.
1930          */
1931         pat = GEN8_PPAT(0, CHV_PPAT_SNOOP) |
1932               GEN8_PPAT(1, 0) |
1933               GEN8_PPAT(2, 0) |
1934               GEN8_PPAT(3, 0) |
1935               GEN8_PPAT(4, CHV_PPAT_SNOOP) |
1936               GEN8_PPAT(5, CHV_PPAT_SNOOP) |
1937               GEN8_PPAT(6, CHV_PPAT_SNOOP) |
1938               GEN8_PPAT(7, CHV_PPAT_SNOOP);
1939
1940         I915_WRITE(GEN8_PRIVATE_PAT, pat);
1941         I915_WRITE(GEN8_PRIVATE_PAT + 4, pat >> 32);
1942 }
1943
1944 static int gen8_gmch_probe(struct drm_device *dev,
1945                            size_t *gtt_total,
1946                            size_t *stolen,
1947                            phys_addr_t *mappable_base,
1948                            unsigned long *mappable_end)
1949 {
1950         struct drm_i915_private *dev_priv = dev->dev_private;
1951         unsigned int gtt_size;
1952         u16 snb_gmch_ctl;
1953         int ret;
1954
1955         /* TODO: We're not aware of mappable constraints on gen8 yet */
1956         *mappable_base = pci_resource_start(dev->pdev, 2);
1957         *mappable_end = pci_resource_len(dev->pdev, 2);
1958
1959         if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(39)))
1960                 pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(39));
1961
1962         pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
1963
1964         if (INTEL_INFO(dev)->gen >= 9) {
1965                 *stolen = gen9_get_stolen_size(snb_gmch_ctl);
1966                 gtt_size = gen8_get_total_gtt_size(snb_gmch_ctl);
1967         } else if (IS_CHERRYVIEW(dev)) {
1968                 *stolen = chv_get_stolen_size(snb_gmch_ctl);
1969                 gtt_size = chv_get_total_gtt_size(snb_gmch_ctl);
1970         } else {
1971                 *stolen = gen8_get_stolen_size(snb_gmch_ctl);
1972                 gtt_size = gen8_get_total_gtt_size(snb_gmch_ctl);
1973         }
1974
1975         *gtt_total = (gtt_size / sizeof(gen8_gtt_pte_t)) << PAGE_SHIFT;
1976
1977         if (IS_CHERRYVIEW(dev))
1978                 chv_setup_private_ppat(dev_priv);
1979         else
1980                 bdw_setup_private_ppat(dev_priv);
1981
1982         ret = ggtt_probe_common(dev, gtt_size);
1983
1984         dev_priv->gtt.base.clear_range = gen8_ggtt_clear_range;
1985         dev_priv->gtt.base.insert_entries = gen8_ggtt_insert_entries;
1986
1987         return ret;
1988 }
1989
1990 static int gen6_gmch_probe(struct drm_device *dev,
1991                            size_t *gtt_total,
1992                            size_t *stolen,
1993                            phys_addr_t *mappable_base,
1994                            unsigned long *mappable_end)
1995 {
1996         struct drm_i915_private *dev_priv = dev->dev_private;
1997         unsigned int gtt_size;
1998         u16 snb_gmch_ctl;
1999         int ret;
2000
2001         *mappable_base = pci_resource_start(dev->pdev, 2);
2002         *mappable_end = pci_resource_len(dev->pdev, 2);
2003
2004         /* 64/512MB is the current min/max we actually know of, but this is just
2005          * a coarse sanity check.
2006          */
2007         if ((*mappable_end < (64<<20) || (*mappable_end > (512<<20)))) {
2008                 DRM_ERROR("Unknown GMADR size (%lx)\n",
2009                           dev_priv->gtt.mappable_end);
2010                 return -ENXIO;
2011         }
2012
2013         if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(40)))
2014                 pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(40));
2015         pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
2016
2017         *stolen = gen6_get_stolen_size(snb_gmch_ctl);
2018
2019         gtt_size = gen6_get_total_gtt_size(snb_gmch_ctl);
2020         *gtt_total = (gtt_size / sizeof(gen6_gtt_pte_t)) << PAGE_SHIFT;
2021
2022         ret = ggtt_probe_common(dev, gtt_size);
2023
2024         dev_priv->gtt.base.clear_range = gen6_ggtt_clear_range;
2025         dev_priv->gtt.base.insert_entries = gen6_ggtt_insert_entries;
2026
2027         return ret;
2028 }
2029
2030 static void gen6_gmch_remove(struct i915_address_space *vm)
2031 {
2032
2033         struct i915_gtt *gtt = container_of(vm, struct i915_gtt, base);
2034
2035         iounmap(gtt->gsm);
2036         teardown_scratch_page(vm->dev);
2037 }
2038
2039 static int i915_gmch_probe(struct drm_device *dev,
2040                            size_t *gtt_total,
2041                            size_t *stolen,
2042                            phys_addr_t *mappable_base,
2043                            unsigned long *mappable_end)
2044 {
2045         struct drm_i915_private *dev_priv = dev->dev_private;
2046         int ret;
2047
2048         ret = intel_gmch_probe(dev_priv->bridge_dev, dev_priv->dev->pdev, NULL);
2049         if (!ret) {
2050                 DRM_ERROR("failed to set up gmch\n");
2051                 return -EIO;
2052         }
2053
2054         intel_gtt_get(gtt_total, stolen, mappable_base, mappable_end);
2055
2056         dev_priv->gtt.do_idle_maps = needs_idle_maps(dev_priv->dev);
2057         dev_priv->gtt.base.clear_range = i915_ggtt_clear_range;
2058
2059         if (unlikely(dev_priv->gtt.do_idle_maps))
2060                 DRM_INFO("applying Ironlake quirks for intel_iommu\n");
2061
2062         return 0;
2063 }
2064
2065 static void i915_gmch_remove(struct i915_address_space *vm)
2066 {
2067         intel_gmch_remove();
2068 }
2069
2070 int i915_gem_gtt_init(struct drm_device *dev)
2071 {
2072         struct drm_i915_private *dev_priv = dev->dev_private;
2073         struct i915_gtt *gtt = &dev_priv->gtt;
2074         int ret;
2075
2076         if (INTEL_INFO(dev)->gen <= 5) {
2077                 gtt->gtt_probe = i915_gmch_probe;
2078                 gtt->base.cleanup = i915_gmch_remove;
2079         } else if (INTEL_INFO(dev)->gen < 8) {
2080                 gtt->gtt_probe = gen6_gmch_probe;
2081                 gtt->base.cleanup = gen6_gmch_remove;
2082                 if (IS_HASWELL(dev) && dev_priv->ellc_size)
2083                         gtt->base.pte_encode = iris_pte_encode;
2084                 else if (IS_HASWELL(dev))
2085                         gtt->base.pte_encode = hsw_pte_encode;
2086                 else if (IS_VALLEYVIEW(dev))
2087                         gtt->base.pte_encode = byt_pte_encode;
2088                 else if (INTEL_INFO(dev)->gen >= 7)
2089                         gtt->base.pte_encode = ivb_pte_encode;
2090                 else
2091                         gtt->base.pte_encode = snb_pte_encode;
2092         } else {
2093                 dev_priv->gtt.gtt_probe = gen8_gmch_probe;
2094                 dev_priv->gtt.base.cleanup = gen6_gmch_remove;
2095         }
2096
2097         ret = gtt->gtt_probe(dev, &gtt->base.total, &gtt->stolen_size,
2098                              &gtt->mappable_base, &gtt->mappable_end);
2099         if (ret)
2100                 return ret;
2101
2102         gtt->base.dev = dev;
2103
2104         /* GMADR is the PCI mmio aperture into the global GTT. */
2105         DRM_INFO("Memory usable by graphics device = %zdM\n",
2106                  gtt->base.total >> 20);
2107         DRM_DEBUG_DRIVER("GMADR size = %ldM\n", gtt->mappable_end >> 20);
2108         DRM_DEBUG_DRIVER("GTT stolen size = %zdM\n", gtt->stolen_size >> 20);
2109 #ifdef CONFIG_INTEL_IOMMU
2110         if (intel_iommu_gfx_mapped)
2111                 DRM_INFO("VT-d active for gfx access\n");
2112 #endif
2113         /*
2114          * i915.enable_ppgtt is read-only, so do an early pass to validate the
2115          * user's requested state against the hardware/driver capabilities.  We
2116          * do this now so that we can print out any log messages once rather
2117          * than every time we check intel_enable_ppgtt().
2118          */
2119         i915.enable_ppgtt = sanitize_enable_ppgtt(dev, i915.enable_ppgtt);
2120         DRM_DEBUG_DRIVER("ppgtt mode: %i\n", i915.enable_ppgtt);
2121
2122         return 0;
2123 }
2124
2125 static struct i915_vma *__i915_gem_vma_create(struct drm_i915_gem_object *obj,
2126                                               struct i915_address_space *vm)
2127 {
2128         struct i915_vma *vma = kzalloc(sizeof(*vma), GFP_KERNEL);
2129         if (vma == NULL)
2130                 return ERR_PTR(-ENOMEM);
2131
2132         INIT_LIST_HEAD(&vma->vma_link);
2133         INIT_LIST_HEAD(&vma->mm_list);
2134         INIT_LIST_HEAD(&vma->exec_list);
2135         vma->vm = vm;
2136         vma->obj = obj;
2137
2138         switch (INTEL_INFO(vm->dev)->gen) {
2139         case 9:
2140         case 8:
2141         case 7:
2142         case 6:
2143                 if (i915_is_ggtt(vm)) {
2144                         vma->unbind_vma = ggtt_unbind_vma;
2145                         vma->bind_vma = ggtt_bind_vma;
2146                 } else {
2147                         vma->unbind_vma = ppgtt_unbind_vma;
2148                         vma->bind_vma = ppgtt_bind_vma;
2149                 }
2150                 break;
2151         case 5:
2152         case 4:
2153         case 3:
2154         case 2:
2155                 BUG_ON(!i915_is_ggtt(vm));
2156                 vma->unbind_vma = i915_ggtt_unbind_vma;
2157                 vma->bind_vma = i915_ggtt_bind_vma;
2158                 break;
2159         default:
2160                 BUG();
2161         }
2162
2163         /* Keep GGTT vmas first to make debug easier */
2164         if (i915_is_ggtt(vm))
2165                 list_add(&vma->vma_link, &obj->vma_list);
2166         else {
2167                 list_add_tail(&vma->vma_link, &obj->vma_list);
2168                 i915_ppgtt_get(i915_vm_to_ppgtt(vm));
2169         }
2170
2171         return vma;
2172 }
2173
2174 struct i915_vma *
2175 i915_gem_obj_lookup_or_create_vma(struct drm_i915_gem_object *obj,
2176                                   struct i915_address_space *vm)
2177 {
2178         struct i915_vma *vma;
2179
2180         vma = i915_gem_obj_to_vma(obj, vm);
2181         if (!vma)
2182                 vma = __i915_gem_vma_create(obj, vm);
2183
2184         return vma;
2185 }