drivers/gpu/drm/i915/i915_gem_gtt.c

   1 /*
   2  * Copyright © 2010 Daniel Vetter
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include <drm/drmP.h>
  26 #include <drm/i915_drm.h>
  27 #include "i915_drv.h"
  28 #include "i915_trace.h"
  29 #include "intel_drv.h"
  30
  31 #define GEN6_PPGTT_PD_ENTRIES 512
  32 #define I915_PPGTT_PT_ENTRIES (PAGE_SIZE / sizeof(gen6_gtt_pte_t))
  33 typedef uint64_t gen8_gtt_pte_t;
  34 typedef gen8_gtt_pte_t gen8_ppgtt_pde_t;
  35
  36 /* PPGTT stuff */
  37 #define GEN6_GTT_ADDR_ENCODE(addr)      ((addr) | (((addr) >> 28) & 0xff0))
  38 #define HSW_GTT_ADDR_ENCODE(addr)       ((addr) | (((addr) >> 28) & 0x7f0))
  39
  40 #define GEN6_PDE_VALID                  (1 << 0)
  41 /* gen6+ has bit 11-4 for physical addr bit 39-32 */
  42 #define GEN6_PDE_ADDR_ENCODE(addr)      GEN6_GTT_ADDR_ENCODE(addr)
  43
  44 #define GEN6_PTE_VALID                  (1 << 0)
  45 #define GEN6_PTE_UNCACHED               (1 << 1)
  46 #define HSW_PTE_UNCACHED                (0)
  47 #define GEN6_PTE_CACHE_LLC              (2 << 1)
  48 #define GEN7_PTE_CACHE_L3_LLC           (3 << 1)
  49 #define GEN6_PTE_ADDR_ENCODE(addr)      GEN6_GTT_ADDR_ENCODE(addr)
  50 #define HSW_PTE_ADDR_ENCODE(addr)       HSW_GTT_ADDR_ENCODE(addr)
  51
  52 /* Cacheability Control is a 4-bit value. The low three bits are stored in *
  53  * bits 3:1 of the PTE, while the fourth bit is stored in bit 11 of the PTE.
  54  */
  55 #define HSW_CACHEABILITY_CONTROL(bits)  ((((bits) & 0x7) << 1) | \
  56                                          (((bits) & 0x8) << (11 - 3)))
  57 #define HSW_WB_LLC_AGE3                 HSW_CACHEABILITY_CONTROL(0x2)
  58 #define HSW_WB_LLC_AGE0                 HSW_CACHEABILITY_CONTROL(0x3)
  59 #define HSW_WB_ELLC_LLC_AGE0            HSW_CACHEABILITY_CONTROL(0xb)
  60 #define HSW_WB_ELLC_LLC_AGE3            HSW_CACHEABILITY_CONTROL(0x8)
  61 #define HSW_WT_ELLC_LLC_AGE0            HSW_CACHEABILITY_CONTROL(0x6)
  62 #define HSW_WT_ELLC_LLC_AGE3            HSW_CACHEABILITY_CONTROL(0x7)
  63
  64 #define GEN8_PTES_PER_PAGE              (PAGE_SIZE / sizeof(gen8_gtt_pte_t))
  65 #define GEN8_PDES_PER_PAGE              (PAGE_SIZE / sizeof(gen8_ppgtt_pde_t))
  66 #define GEN8_LEGACY_PDPS                4
  67
  68 #define PPAT_UNCACHED_INDEX             (_PAGE_PWT | _PAGE_PCD)
  69 #define PPAT_CACHED_PDE_INDEX           0 /* WB LLC */
  70 #define PPAT_CACHED_INDEX               _PAGE_PAT /* WB LLCeLLC */
  71 #define PPAT_DISPLAY_ELLC_INDEX         _PAGE_PCD /* WT eLLC */
  72
  73 static inline gen8_gtt_pte_t gen8_pte_encode(dma_addr_t addr,
  74                                              enum i915_cache_level level,
  75                                              bool valid)
  76 {
  77         gen8_gtt_pte_t pte = valid ? _PAGE_PRESENT | _PAGE_RW : 0;
  78         pte |= addr;
  79         if (level != I915_CACHE_NONE)
  80                 pte |= PPAT_CACHED_INDEX;
  81         else
  82                 pte |= PPAT_UNCACHED_INDEX;
  83         return pte;
  84 }
  85
  86 static inline gen8_ppgtt_pde_t gen8_pde_encode(struct drm_device *dev,
  87                                              dma_addr_t addr,
  88                                              enum i915_cache_level level)
  89 {
  90         gen8_ppgtt_pde_t pde = _PAGE_PRESENT | _PAGE_RW;
  91         pde |= addr;
  92         if (level != I915_CACHE_NONE)
  93                 pde |= PPAT_CACHED_PDE_INDEX;
  94         else
  95                 pde |= PPAT_UNCACHED_INDEX;
  96         return pde;
  97 }
  98
  99 static gen6_gtt_pte_t snb_pte_encode(dma_addr_t addr,
 100                                      enum i915_cache_level level,
 101                                      bool valid)
 102 {
 103         gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
 104         pte |= GEN6_PTE_ADDR_ENCODE(addr);
 105
 106         switch (level) {
 107         case I915_CACHE_L3_LLC:
 108         case I915_CACHE_LLC:
 109                 pte |= GEN6_PTE_CACHE_LLC;
 110                 break;
 111         case I915_CACHE_NONE:
 112                 pte |= GEN6_PTE_UNCACHED;
 113                 break;
 114         default:
 115                 WARN_ON(1);
 116         }
 117
 118         return pte;
 119 }
 120
 121 static gen6_gtt_pte_t ivb_pte_encode(dma_addr_t addr,
 122                                      enum i915_cache_level level,
 123                                      bool valid)
 124 {
 125         gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
 126         pte |= GEN6_PTE_ADDR_ENCODE(addr);
 127
 128         switch (level) {
 129         case I915_CACHE_L3_LLC:
 130                 pte |= GEN7_PTE_CACHE_L3_LLC;
 131                 break;
 132         case I915_CACHE_LLC:
 133                 pte |= GEN6_PTE_CACHE_LLC;
 134                 break;
 135         case I915_CACHE_NONE:
 136                 pte |= GEN6_PTE_UNCACHED;
 137                 break;
 138         default:
 139                 WARN_ON(1);
 140         }
 141
 142         return pte;
 143 }
 144
 145 #define BYT_PTE_WRITEABLE               (1 << 1)
 146 #define BYT_PTE_SNOOPED_BY_CPU_CACHES   (1 << 2)
 147
 148 static gen6_gtt_pte_t byt_pte_encode(dma_addr_t addr,
 149                                      enum i915_cache_level level,
 150                                      bool valid)
 151 {
 152         gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
 153         pte |= GEN6_PTE_ADDR_ENCODE(addr);
 154
 155         /* Mark the page as writeable.  Other platforms don't have a
 156          * setting for read-only/writable, so this matches that behavior.
 157          */
 158         pte |= BYT_PTE_WRITEABLE;
 159
 160         if (level != I915_CACHE_NONE)
 161                 pte |= BYT_PTE_SNOOPED_BY_CPU_CACHES;
 162
 163         return pte;
 164 }
 165
 166 static gen6_gtt_pte_t hsw_pte_encode(dma_addr_t addr,
 167                                      enum i915_cache_level level,
 168                                      bool valid)
 169 {
 170         gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
 171         pte |= HSW_PTE_ADDR_ENCODE(addr);
 172
 173         if (level != I915_CACHE_NONE)
 174                 pte |= HSW_WB_LLC_AGE3;
 175
 176         return pte;
 177 }
 178
 179 static gen6_gtt_pte_t iris_pte_encode(dma_addr_t addr,
 180                                       enum i915_cache_level level,
 181                                       bool valid)
 182 {
 183         gen6_gtt_pte_t pte = valid ? GEN6_PTE_VALID : 0;
 184         pte |= HSW_PTE_ADDR_ENCODE(addr);
 185
 186         switch (level) {
 187         case I915_CACHE_NONE:
 188                 break;
 189         case I915_CACHE_WT:
 190                 pte |= HSW_WT_ELLC_LLC_AGE3;
 191                 break;
 192         default:
 193                 pte |= HSW_WB_ELLC_LLC_AGE3;
 194                 break;
 195         }
 196
 197         return pte;
 198 }
 199
 200 /* Broadwell Page Directory Pointer Descriptors */
 201 static int gen8_write_pdp(struct intel_ring_buffer *ring, unsigned entry,
 202                            uint64_t val)
 203 {
 204         int ret;
 205
 206         BUG_ON(entry >= 4);
 207
 208         ret = intel_ring_begin(ring, 6);
 209         if (ret)
 210                 return ret;
 211
 212         intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
 213         intel_ring_emit(ring, GEN8_RING_PDP_UDW(ring, entry));
 214         intel_ring_emit(ring, (u32)(val >> 32));
 215         intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
 216         intel_ring_emit(ring, GEN8_RING_PDP_LDW(ring, entry));
 217         intel_ring_emit(ring, (u32)(val));
 218         intel_ring_advance(ring);
 219
 220         return 0;
 221 }
 222
 223 static int gen8_ppgtt_enable(struct drm_device *dev)
 224 {
 225         struct drm_i915_private *dev_priv = dev->dev_private;
 226         struct intel_ring_buffer *ring;
 227         struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
 228         int i, j, ret;
 229
 230         /* bit of a hack to find the actual last used pd */
 231         int used_pd = ppgtt->num_pd_entries / GEN8_PDES_PER_PAGE;
 232
 233         for_each_ring(ring, dev_priv, j) {
 234                 I915_WRITE(RING_MODE_GEN7(ring),
 235                            _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
 236         }
 237
 238         for (i = used_pd - 1; i >= 0; i--) {
 239                 dma_addr_t addr = ppgtt->pd_dma_addr[i];
 240                 for_each_ring(ring, dev_priv, j) {
 241                         ret = gen8_write_pdp(ring, i, addr);
 242                         if (ret)
 243                                 goto err_out;
 244                 }
 245         }
 246         return 0;
 247
 248 err_out:
 249         for_each_ring(ring, dev_priv, j)
 250                 I915_WRITE(RING_MODE_GEN7(ring),
 251                            _MASKED_BIT_DISABLE(GFX_PPGTT_ENABLE));
 252         return ret;
 253 }
 254
 255 static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
 256                                    unsigned first_entry,
 257                                    unsigned num_entries,
 258                                    bool use_scratch)
 259 {
 260         struct i915_hw_ppgtt *ppgtt =
 261                 container_of(vm, struct i915_hw_ppgtt, base);
 262         gen8_gtt_pte_t *pt_vaddr, scratch_pte;
 263         unsigned act_pt = first_entry / GEN8_PTES_PER_PAGE;
 264         unsigned first_pte = first_entry % GEN8_PTES_PER_PAGE;
 265         unsigned last_pte, i;
 266
 267         scratch_pte = gen8_pte_encode(ppgtt->base.scratch.addr,
 268                                       I915_CACHE_LLC, use_scratch);
 269
 270         while (num_entries) {
 271                 struct page *page_table = &ppgtt->gen8_pt_pages[act_pt];
 272
 273                 last_pte = first_pte + num_entries;
 274                 if (last_pte > GEN8_PTES_PER_PAGE)
 275                         last_pte = GEN8_PTES_PER_PAGE;
 276
 277                 pt_vaddr = kmap_atomic(page_table);
 278
 279                 for (i = first_pte; i < last_pte; i++)
 280                         pt_vaddr[i] = scratch_pte;
 281
 282                 kunmap_atomic(pt_vaddr);
 283
 284                 num_entries -= last_pte - first_pte;
 285                 first_pte = 0;
 286                 act_pt++;
 287         }
 288 }
 289
 290 static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
 291                                       struct sg_table *pages,
 292                                       unsigned first_entry,
 293                                       enum i915_cache_level cache_level)
 294 {
 295         struct i915_hw_ppgtt *ppgtt =
 296                 container_of(vm, struct i915_hw_ppgtt, base);
 297         gen8_gtt_pte_t *pt_vaddr;
 298         unsigned act_pt = first_entry / GEN8_PTES_PER_PAGE;
 299         unsigned act_pte = first_entry % GEN8_PTES_PER_PAGE;
 300         struct sg_page_iter sg_iter;
 301
 302         pt_vaddr = NULL;
 303         for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) {
 304                 if (pt_vaddr == NULL)
 305                         pt_vaddr = kmap_atomic(&ppgtt->gen8_pt_pages[act_pt]);
 306
 307                 pt_vaddr[act_pte] =
 308                         gen8_pte_encode(sg_page_iter_dma_address(&sg_iter),
 309                                         cache_level, true);
 310                 if (++act_pte == GEN8_PTES_PER_PAGE) {
 311                         kunmap_atomic(pt_vaddr);
 312                         pt_vaddr = NULL;
 313                         act_pt++;
 314                         act_pte = 0;
 315                 }
 316         }
 317         if (pt_vaddr)
 318                 kunmap_atomic(pt_vaddr);
 319 }
 320
 321 static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
 322 {
 323         struct i915_hw_ppgtt *ppgtt =
 324                 container_of(vm, struct i915_hw_ppgtt, base);
 325         int i, j;
 326
 327         drm_mm_takedown(&vm->mm);
 328
 329         for (i = 0; i < ppgtt->num_pd_pages ; i++) {
 330                 if (ppgtt->pd_dma_addr[i]) {
 331                         pci_unmap_page(ppgtt->base.dev->pdev,
 332                                        ppgtt->pd_dma_addr[i],
 333                                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 334
 335                         for (j = 0; j < GEN8_PDES_PER_PAGE; j++) {
 336                                 dma_addr_t addr = ppgtt->gen8_pt_dma_addr[i][j];
 337                                 if (addr)
 338                                         pci_unmap_page(ppgtt->base.dev->pdev,
 339                                                        addr,
 340                                                        PAGE_SIZE,
 341                                                        PCI_DMA_BIDIRECTIONAL);
 342
 343                         }
 344                 }
 345                 kfree(ppgtt->gen8_pt_dma_addr[i]);
 346         }
 347
 348         __free_pages(ppgtt->gen8_pt_pages, get_order(ppgtt->num_pt_pages << PAGE_SHIFT));
 349         __free_pages(ppgtt->pd_pages, get_order(ppgtt->num_pd_pages << PAGE_SHIFT));
 350 }
 351
 352 /**
 353  * GEN8 legacy ppgtt programming is accomplished through 4 PDP registers with a
 354  * net effect resembling a 2-level page table in normal x86 terms. Each PDP
 355  * represents 1GB of memory
 356  * 4 * 512 * 512 * 4096 = 4GB legacy 32b address space.
 357  *
 358  * TODO: Do something with the size parameter
 359  **/
 360 static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size)
 361 {
 362         struct page *pt_pages;
 363         int i, j, ret = -ENOMEM;
 364         const int max_pdp = DIV_ROUND_UP(size, 1 << 30);
 365         const int num_pt_pages = GEN8_PDES_PER_PAGE * max_pdp;
 366
 367         if (size % (1<<30))
 368                 DRM_INFO("Pages will be wasted unless GTT size (%llu) is divisible by 1GB\n", size);
 369
 370         /* FIXME: split allocation into smaller pieces. For now we only ever do
 371          * this once, but with full PPGTT, the multiple contiguous allocations
 372          * will be bad.
 373          */
 374         ppgtt->pd_pages = alloc_pages(GFP_KERNEL, get_order(max_pdp << PAGE_SHIFT));
 375         if (!ppgtt->pd_pages)
 376                 return -ENOMEM;
 377
 378         pt_pages = alloc_pages(GFP_KERNEL, get_order(num_pt_pages << PAGE_SHIFT));
 379         if (!pt_pages) {
 380                 __free_pages(ppgtt->pd_pages, get_order(max_pdp << PAGE_SHIFT));
 381                 return -ENOMEM;
 382         }
 383
 384         ppgtt->gen8_pt_pages = pt_pages;
 385         ppgtt->num_pd_pages = 1 << get_order(max_pdp << PAGE_SHIFT);
 386         ppgtt->num_pt_pages = 1 << get_order(num_pt_pages << PAGE_SHIFT);
 387         ppgtt->num_pd_entries = max_pdp * GEN8_PDES_PER_PAGE;
 388         ppgtt->enable = gen8_ppgtt_enable;
 389         ppgtt->base.clear_range = gen8_ppgtt_clear_range;
 390         ppgtt->base.insert_entries = gen8_ppgtt_insert_entries;
 391         ppgtt->base.cleanup = gen8_ppgtt_cleanup;
 392         ppgtt->base.start = 0;
 393         ppgtt->base.total = ppgtt->num_pt_pages * GEN8_PTES_PER_PAGE * PAGE_SIZE;
 394
 395         BUG_ON(ppgtt->num_pd_pages > GEN8_LEGACY_PDPS);
 396
 397         /*
 398          * - Create a mapping for the page directories.
 399          * - For each page directory:
 400          *      allocate space for page table mappings.
 401          *      map each page table
 402          */
 403         for (i = 0; i < max_pdp; i++) {
 404                 dma_addr_t temp;
 405                 temp = pci_map_page(ppgtt->base.dev->pdev,
 406                                     &ppgtt->pd_pages[i], 0,
 407                                     PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 408                 if (pci_dma_mapping_error(ppgtt->base.dev->pdev, temp))
 409                         goto err_out;
 410
 411                 ppgtt->pd_dma_addr[i] = temp;
 412
 413                 ppgtt->gen8_pt_dma_addr[i] = kmalloc(sizeof(dma_addr_t) * GEN8_PDES_PER_PAGE, GFP_KERNEL);
 414                 if (!ppgtt->gen8_pt_dma_addr[i])
 415                         goto err_out;
 416
 417                 for (j = 0; j < GEN8_PDES_PER_PAGE; j++) {
 418                         struct page *p = &pt_pages[i * GEN8_PDES_PER_PAGE + j];
 419                         temp = pci_map_page(ppgtt->base.dev->pdev,
 420                                             p, 0, PAGE_SIZE,
 421                                             PCI_DMA_BIDIRECTIONAL);
 422
 423                         if (pci_dma_mapping_error(ppgtt->base.dev->pdev, temp))
 424                                 goto err_out;
 425
 426                         ppgtt->gen8_pt_dma_addr[i][j] = temp;
 427                 }
 428         }
 429
 430         /* For now, the PPGTT helper functions all require that the PDEs are
 431          * plugged in correctly. So we do that now/here. For aliasing PPGTT, we
 432          * will never need to touch the PDEs again */
 433         for (i = 0; i < max_pdp; i++) {
 434                 gen8_ppgtt_pde_t *pd_vaddr;
 435                 pd_vaddr = kmap_atomic(&ppgtt->pd_pages[i]);
 436                 for (j = 0; j < GEN8_PDES_PER_PAGE; j++) {
 437                         dma_addr_t addr = ppgtt->gen8_pt_dma_addr[i][j];
 438                         pd_vaddr[j] = gen8_pde_encode(ppgtt->base.dev, addr,
 439                                                       I915_CACHE_LLC);
 440                 }
 441                 kunmap_atomic(pd_vaddr);
 442         }
 443
 444         ppgtt->base.clear_range(&ppgtt->base, 0,
 445                                 ppgtt->num_pd_entries * GEN8_PTES_PER_PAGE,
 446                                 true);
 447
 448         DRM_DEBUG_DRIVER("Allocated %d pages for page directories (%d wasted)\n",
 449                          ppgtt->num_pd_pages, ppgtt->num_pd_pages - max_pdp);
 450         DRM_DEBUG_DRIVER("Allocated %d pages for page tables (%lld wasted)\n",
 451                          ppgtt->num_pt_pages,
 452                          (ppgtt->num_pt_pages - num_pt_pages) +
 453                          size % (1<<30));
 454         return 0;
 455
 456 err_out:
 457         ppgtt->base.cleanup(&ppgtt->base);
 458         return ret;
 459 }
 460
 461 static void gen6_write_pdes(struct i915_hw_ppgtt *ppgtt)
 462 {
 463         struct drm_i915_private *dev_priv = ppgtt->base.dev->dev_private;
 464         gen6_gtt_pte_t __iomem *pd_addr;
 465         uint32_t pd_entry;
 466         int i;
 467
 468         WARN_ON(ppgtt->pd_offset & 0x3f);
 469         pd_addr = (gen6_gtt_pte_t __iomem*)dev_priv->gtt.gsm +
 470                 ppgtt->pd_offset / sizeof(gen6_gtt_pte_t);
 471         for (i = 0; i < ppgtt->num_pd_entries; i++) {
 472                 dma_addr_t pt_addr;
 473
 474                 pt_addr = ppgtt->pt_dma_addr[i];
 475                 pd_entry = GEN6_PDE_ADDR_ENCODE(pt_addr);
 476                 pd_entry |= GEN6_PDE_VALID;
 477
 478                 writel(pd_entry, pd_addr + i);
 479         }
 480         readl(pd_addr);
 481 }
 482
 483 static int gen6_ppgtt_enable(struct drm_device *dev)
 484 {
 485         drm_i915_private_t *dev_priv = dev->dev_private;
 486         uint32_t pd_offset;
 487         struct intel_ring_buffer *ring;
 488         struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
 489         int i;
 490
 491         BUG_ON(ppgtt->pd_offset & 0x3f);
 492
 493         gen6_write_pdes(ppgtt);
 494
 495         pd_offset = ppgtt->pd_offset;
 496         pd_offset /= 64; /* in cachelines, */
 497         pd_offset <<= 16;
 498
 499         if (INTEL_INFO(dev)->gen == 6) {
 500                 uint32_t ecochk, gab_ctl, ecobits;
 501
 502                 ecobits = I915_READ(GAC_ECO_BITS);
 503                 I915_WRITE(GAC_ECO_BITS, ecobits | ECOBITS_SNB_BIT |
 504                                          ECOBITS_PPGTT_CACHE64B);
 505
 506                 gab_ctl = I915_READ(GAB_CTL);
 507                 I915_WRITE(GAB_CTL, gab_ctl | GAB_CTL_CONT_AFTER_PAGEFAULT);
 508
 509                 ecochk = I915_READ(GAM_ECOCHK);
 510                 I915_WRITE(GAM_ECOCHK, ecochk | ECOCHK_SNB_BIT |
 511                                        ECOCHK_PPGTT_CACHE64B);
 512                 I915_WRITE(GFX_MODE, _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
 513         } else if (INTEL_INFO(dev)->gen >= 7) {
 514                 uint32_t ecochk, ecobits;
 515
 516                 ecobits = I915_READ(GAC_ECO_BITS);
 517                 I915_WRITE(GAC_ECO_BITS, ecobits | ECOBITS_PPGTT_CACHE64B);
 518
 519                 ecochk = I915_READ(GAM_ECOCHK);
 520                 if (IS_HASWELL(dev)) {
 521                         ecochk |= ECOCHK_PPGTT_WB_HSW;
 522                 } else {
 523                         ecochk |= ECOCHK_PPGTT_LLC_IVB;
 524                         ecochk &= ~ECOCHK_PPGTT_GFDT_IVB;
 525                 }
 526                 I915_WRITE(GAM_ECOCHK, ecochk);
 527                 /* GFX_MODE is per-ring on gen7+ */
 528         }
 529
 530         for_each_ring(ring, dev_priv, i) {
 531                 if (INTEL_INFO(dev)->gen >= 7)
 532                         I915_WRITE(RING_MODE_GEN7(ring),
 533                                    _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
 534
 535                 I915_WRITE(RING_PP_DIR_DCLV(ring), PP_DIR_DCLV_2G);
 536                 I915_WRITE(RING_PP_DIR_BASE(ring), pd_offset);
 537         }
 538         return 0;
 539 }
 540
 541 /* PPGTT support for Sandybdrige/Gen6 and later */
 542 static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
 543                                    unsigned first_entry,
 544                                    unsigned num_entries,
 545                                    bool use_scratch)
 546 {
 547         struct i915_hw_ppgtt *ppgtt =
 548                 container_of(vm, struct i915_hw_ppgtt, base);
 549         gen6_gtt_pte_t *pt_vaddr, scratch_pte;
 550         unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
 551         unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;
 552         unsigned last_pte, i;
 553
 554         scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, true);
 555
 556         while (num_entries) {
 557                 last_pte = first_pte + num_entries;
 558                 if (last_pte > I915_PPGTT_PT_ENTRIES)
 559                         last_pte = I915_PPGTT_PT_ENTRIES;
 560
 561                 pt_vaddr = kmap_atomic(ppgtt->pt_pages[act_pt]);
 562
 563                 for (i = first_pte; i < last_pte; i++)
 564                         pt_vaddr[i] = scratch_pte;
 565
 566                 kunmap_atomic(pt_vaddr);
 567
 568                 num_entries -= last_pte - first_pte;
 569                 first_pte = 0;
 570                 act_pt++;
 571         }
 572 }
 573
 574 static void gen6_ppgtt_insert_entries(struct i915_address_space *vm,
 575                                       struct sg_table *pages,
 576                                       unsigned first_entry,
 577                                       enum i915_cache_level cache_level)
 578 {
 579         struct i915_hw_ppgtt *ppgtt =
 580                 container_of(vm, struct i915_hw_ppgtt, base);
 581         gen6_gtt_pte_t *pt_vaddr;
 582         unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
 583         unsigned act_pte = first_entry % I915_PPGTT_PT_ENTRIES;
 584         struct sg_page_iter sg_iter;
 585
 586         pt_vaddr = NULL;
 587         for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) {
 588                 if (pt_vaddr == NULL)
 589                         pt_vaddr = kmap_atomic(ppgtt->pt_pages[act_pt]);
 590
 591                 pt_vaddr[act_pte] =
 592                         vm->pte_encode(sg_page_iter_dma_address(&sg_iter),
 593                                        cache_level, true);
 594                 if (++act_pte == I915_PPGTT_PT_ENTRIES) {
 595                         kunmap_atomic(pt_vaddr);
 596                         pt_vaddr = NULL;
 597                         act_pt++;
 598                         act_pte = 0;
 599                 }
 600         }
 601         if (pt_vaddr)
 602                 kunmap_atomic(pt_vaddr);
 603 }
 604
 605 static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
 606 {
 607         struct i915_hw_ppgtt *ppgtt =
 608                 container_of(vm, struct i915_hw_ppgtt, base);
 609         int i;
 610
 611         drm_mm_takedown(&ppgtt->base.mm);
 612
 613         if (ppgtt->pt_dma_addr) {
 614                 for (i = 0; i < ppgtt->num_pd_entries; i++)
 615                         pci_unmap_page(ppgtt->base.dev->pdev,
 616                                        ppgtt->pt_dma_addr[i],
 617                                        4096, PCI_DMA_BIDIRECTIONAL);
 618         }
 619
 620         kfree(ppgtt->pt_dma_addr);
 621         for (i = 0; i < ppgtt->num_pd_entries; i++)
 622                 __free_page(ppgtt->pt_pages[i]);
 623         kfree(ppgtt->pt_pages);
 624         kfree(ppgtt);
 625 }
 626
 627 static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
 628 {
 629         struct drm_device *dev = ppgtt->base.dev;
 630         struct drm_i915_private *dev_priv = dev->dev_private;
 631         unsigned first_pd_entry_in_global_pt;
 632         int i;
 633         int ret = -ENOMEM;
 634
 635         /* ppgtt PDEs reside in the global gtt pagetable, which has 512*1024
 636          * entries. For aliasing ppgtt support we just steal them at the end for
 637          * now. */
 638         first_pd_entry_in_global_pt = gtt_total_entries(dev_priv->gtt);
 639
 640         ppgtt->base.pte_encode = dev_priv->gtt.base.pte_encode;
 641         ppgtt->num_pd_entries = GEN6_PPGTT_PD_ENTRIES;
 642         ppgtt->enable = gen6_ppgtt_enable;
 643         ppgtt->base.clear_range = gen6_ppgtt_clear_range;
 644         ppgtt->base.insert_entries = gen6_ppgtt_insert_entries;
 645         ppgtt->base.cleanup = gen6_ppgtt_cleanup;
 646         ppgtt->base.scratch = dev_priv->gtt.base.scratch;
 647         ppgtt->base.start = 0;
 648         ppgtt->base.total = GEN6_PPGTT_PD_ENTRIES * I915_PPGTT_PT_ENTRIES * PAGE_SIZE;
 649         ppgtt->pt_pages = kcalloc(ppgtt->num_pd_entries, sizeof(struct page *),
 650                                   GFP_KERNEL);
 651         if (!ppgtt->pt_pages)
 652                 return -ENOMEM;
 653
 654         for (i = 0; i < ppgtt->num_pd_entries; i++) {
 655                 ppgtt->pt_pages[i] = alloc_page(GFP_KERNEL);
 656                 if (!ppgtt->pt_pages[i])
 657                         goto err_pt_alloc;
 658         }
 659
 660         ppgtt->pt_dma_addr = kcalloc(ppgtt->num_pd_entries, sizeof(dma_addr_t),
 661                                      GFP_KERNEL);
 662         if (!ppgtt->pt_dma_addr)
 663                 goto err_pt_alloc;
 664
 665         for (i = 0; i < ppgtt->num_pd_entries; i++) {
 666                 dma_addr_t pt_addr;
 667
 668                 pt_addr = pci_map_page(dev->pdev, ppgtt->pt_pages[i], 0, 4096,
 669                                        PCI_DMA_BIDIRECTIONAL);
 670
 671                 if (pci_dma_mapping_error(dev->pdev, pt_addr)) {
 672                         ret = -EIO;
 673                         goto err_pd_pin;
 674
 675                 }
 676                 ppgtt->pt_dma_addr[i] = pt_addr;
 677         }
 678
 679         ppgtt->base.clear_range(&ppgtt->base, 0,
 680                                 ppgtt->num_pd_entries * I915_PPGTT_PT_ENTRIES, true);
 681
 682         ppgtt->pd_offset = first_pd_entry_in_global_pt * sizeof(gen6_gtt_pte_t);
 683
 684         return 0;
 685
 686 err_pd_pin:
 687         if (ppgtt->pt_dma_addr) {
 688                 for (i--; i >= 0; i--)
 689                         pci_unmap_page(dev->pdev, ppgtt->pt_dma_addr[i],
 690                                        4096, PCI_DMA_BIDIRECTIONAL);
 691         }
 692 err_pt_alloc:
 693         kfree(ppgtt->pt_dma_addr);
 694         for (i = 0; i < ppgtt->num_pd_entries; i++) {
 695                 if (ppgtt->pt_pages[i])
 696                         __free_page(ppgtt->pt_pages[i]);
 697         }
 698         kfree(ppgtt->pt_pages);
 699
 700         return ret;
 701 }
 702
 703 static int i915_gem_init_aliasing_ppgtt(struct drm_device *dev)
 704 {
 705         struct drm_i915_private *dev_priv = dev->dev_private;
 706         struct i915_hw_ppgtt *ppgtt;
 707         int ret;
 708
 709         ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);
 710         if (!ppgtt)
 711                 return -ENOMEM;
 712
 713         ppgtt->base.dev = dev;
 714
 715         if (INTEL_INFO(dev)->gen < 8)
 716                 ret = gen6_ppgtt_init(ppgtt);
 717         else if (IS_GEN8(dev))
 718                 ret = gen8_ppgtt_init(ppgtt, dev_priv->gtt.base.total);
 719         else
 720                 BUG();
 721
 722         if (ret)
 723                 kfree(ppgtt);
 724         else {
 725                 dev_priv->mm.aliasing_ppgtt = ppgtt;
 726                 drm_mm_init(&ppgtt->base.mm, ppgtt->base.start,
 727                             ppgtt->base.total);
 728         }
 729
 730         return ret;
 731 }
 732
 733 void i915_gem_cleanup_aliasing_ppgtt(struct drm_device *dev)
 734 {
 735         struct drm_i915_private *dev_priv = dev->dev_private;
 736         struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
 737
 738         if (!ppgtt)
 739                 return;
 740
 741         ppgtt->base.cleanup(&ppgtt->base);
 742         dev_priv->mm.aliasing_ppgtt = NULL;
 743 }
 744
 745 void i915_ppgtt_bind_object(struct i915_hw_ppgtt *ppgtt,
 746                             struct drm_i915_gem_object *obj,
 747                             enum i915_cache_level cache_level)
 748 {
 749         ppgtt->base.insert_entries(&ppgtt->base, obj->pages,
 750                                    i915_gem_obj_ggtt_offset(obj) >> PAGE_SHIFT,
 751                                    cache_level);
 752 }
 753
 754 void i915_ppgtt_unbind_object(struct i915_hw_ppgtt *ppgtt,
 755                               struct drm_i915_gem_object *obj)
 756 {
 757         ppgtt->base.clear_range(&ppgtt->base,
 758                                 i915_gem_obj_ggtt_offset(obj) >> PAGE_SHIFT,
 759                                 obj->base.size >> PAGE_SHIFT,
 760                                 true);
 761 }
 762
 763 extern int intel_iommu_gfx_mapped;
 764 /* Certain Gen5 chipsets require require idling the GPU before
 765  * unmapping anything from the GTT when VT-d is enabled.
 766  */
 767 static inline bool needs_idle_maps(struct drm_device *dev)
 768 {
 769 #ifdef CONFIG_INTEL_IOMMU
 770         /* Query intel_iommu to see if we need the workaround. Presumably that
 771          * was loaded first.
 772          */
 773         if (IS_GEN5(dev) && IS_MOBILE(dev) && intel_iommu_gfx_mapped)
 774                 return true;
 775 #endif
 776         return false;
 777 }
 778
 779 static bool do_idling(struct drm_i915_private *dev_priv)
 780 {
 781         bool ret = dev_priv->mm.interruptible;
 782
 783         if (unlikely(dev_priv->gtt.do_idle_maps)) {
 784                 dev_priv->mm.interruptible = false;
 785                 if (i915_gpu_idle(dev_priv->dev)) {
 786                         DRM_ERROR("Couldn't idle GPU\n");
 787                         /* Wait a bit, in hopes it avoids the hang */
 788                         udelay(10);
 789                 }
 790         }
 791
 792         return ret;
 793 }
 794
 795 static void undo_idling(struct drm_i915_private *dev_priv, bool interruptible)
 796 {
 797         if (unlikely(dev_priv->gtt.do_idle_maps))
 798                 dev_priv->mm.interruptible = interruptible;
 799 }
 800
 801 void i915_check_and_clear_faults(struct drm_device *dev)
 802 {
 803         struct drm_i915_private *dev_priv = dev->dev_private;
 804         struct intel_ring_buffer *ring;
 805         int i;
 806
 807         if (INTEL_INFO(dev)->gen < 6)
 808                 return;
 809
 810         for_each_ring(ring, dev_priv, i) {
 811                 u32 fault_reg;
 812                 fault_reg = I915_READ(RING_FAULT_REG(ring));
 813                 if (fault_reg & RING_FAULT_VALID) {
 814                         DRM_DEBUG_DRIVER("Unexpected fault\n"
 815                                          "\tAddr: 0x%08lx\\n"
 816                                          "\tAddress space: %s\n"
 817                                          "\tSource ID: %d\n"
 818                                          "\tType: %d\n",
 819                                          fault_reg & PAGE_MASK,
 820                                          fault_reg & RING_FAULT_GTTSEL_MASK ? "GGTT" : "PPGTT",
 821                                          RING_FAULT_SRCID(fault_reg),
 822                                          RING_FAULT_FAULT_TYPE(fault_reg));
 823                         I915_WRITE(RING_FAULT_REG(ring),
 824                                    fault_reg & ~RING_FAULT_VALID);
 825                 }
 826         }
 827         POSTING_READ(RING_FAULT_REG(&dev_priv->ring[RCS]));
 828 }
 829
 830 static void i915_ggtt_flush(struct drm_i915_private *dev_priv)
 831 {
 832         if (INTEL_INFO(dev_priv->dev)->gen < 6) {
 833                 intel_gtt_chipset_flush();
 834         } else {
 835                 I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
 836                 POSTING_READ(GFX_FLSH_CNTL_GEN6);
 837         }
 838 }
 839
 840 void i915_gem_suspend_gtt_mappings(struct drm_device *dev)
 841 {
 842         struct drm_i915_private *dev_priv = dev->dev_private;
 843
 844         /* Don't bother messing with faults pre GEN6 as we have little
 845          * documentation supporting that it's a good idea.
 846          */
 847         if (INTEL_INFO(dev)->gen < 6)
 848                 return;
 849
 850         i915_check_and_clear_faults(dev);
 851
 852         dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
 853                                        dev_priv->gtt.base.start / PAGE_SIZE,
 854                                        dev_priv->gtt.base.total / PAGE_SIZE,
 855                                        true);
 856
 857         i915_ggtt_flush(dev_priv);
 858 }
 859
 860 void i915_gem_restore_gtt_mappings(struct drm_device *dev)
 861 {
 862         struct drm_i915_private *dev_priv = dev->dev_private;
 863         struct drm_i915_gem_object *obj;
 864
 865         i915_check_and_clear_faults(dev);
 866
 867         /* First fill our portion of the GTT with scratch pages */
 868         dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
 869                                        dev_priv->gtt.base.start / PAGE_SIZE,
 870                                        dev_priv->gtt.base.total / PAGE_SIZE,
 871                                        true);
 872
 873         list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
 874                 i915_gem_clflush_object(obj, obj->pin_display);
 875                 i915_gem_gtt_bind_object(obj, obj->cache_level);
 876         }
 877
 878         i915_ggtt_flush(dev_priv);
 879 }
 880
 881 int i915_gem_gtt_prepare_object(struct drm_i915_gem_object *obj)
 882 {
 883         if (obj->has_dma_mapping)
 884                 return 0;
 885
 886         if (!dma_map_sg(&obj->base.dev->pdev->dev,
 887                         obj->pages->sgl, obj->pages->nents,
 888                         PCI_DMA_BIDIRECTIONAL))
 889                 return -ENOSPC;
 890
 891         return 0;
 892 }
 893
 894 static inline void gen8_set_pte(void __iomem *addr, gen8_gtt_pte_t pte)
 895 {
 896 #ifdef writeq
 897         writeq(pte, addr);
 898 #else
 899         iowrite32((u32)pte, addr);
 900         iowrite32(pte >> 32, addr + 4);
 901 #endif
 902 }
 903
 904 static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
 905                                      struct sg_table *st,
 906                                      unsigned int first_entry,
 907                                      enum i915_cache_level level)
 908 {
 909         struct drm_i915_private *dev_priv = vm->dev->dev_private;
 910         gen8_gtt_pte_t __iomem *gtt_entries =
 911                 (gen8_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
 912         int i = 0;
 913         struct sg_page_iter sg_iter;
 914         dma_addr_t addr;
 915
 916         for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) {
 917                 addr = sg_dma_address(sg_iter.sg) +
 918                         (sg_iter.sg_pgoffset << PAGE_SHIFT);
 919                 gen8_set_pte(&gtt_entries[i],
 920                              gen8_pte_encode(addr, level, true));
 921                 i++;
 922         }
 923
 924         /*
 925          * XXX: This serves as a posting read to make sure that the PTE has
 926          * actually been updated. There is some concern that even though
 927          * registers and PTEs are within the same BAR that they are potentially
 928          * of NUMA access patterns. Therefore, even with the way we assume
 929          * hardware should work, we must keep this posting read for paranoia.
 930          */
 931         if (i != 0)
 932                 WARN_ON(readq(&gtt_entries[i-1])
 933                         != gen8_pte_encode(addr, level, true));
 934
 935         /* This next bit makes the above posting read even more important. We
 936          * want to flush the TLBs only after we're certain all the PTE updates
 937          * have finished.
 938          */
 939         I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
 940         POSTING_READ(GFX_FLSH_CNTL_GEN6);
 941 }
 942
 943 /*
 944  * Binds an object into the global gtt with the specified cache level. The object
 945  * will be accessible to the GPU via commands whose operands reference offsets
 946  * within the global GTT as well as accessible by the GPU through the GMADR
 947  * mapped BAR (dev_priv->mm.gtt->gtt).
 948  */
 949 static void gen6_ggtt_insert_entries(struct i915_address_space *vm,
 950                                      struct sg_table *st,
 951                                      unsigned int first_entry,
 952                                      enum i915_cache_level level)
 953 {
 954         struct drm_i915_private *dev_priv = vm->dev->dev_private;
 955         gen6_gtt_pte_t __iomem *gtt_entries =
 956                 (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
 957         int i = 0;
 958         struct sg_page_iter sg_iter;
 959         dma_addr_t addr;
 960
 961         for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) {
 962                 addr = sg_page_iter_dma_address(&sg_iter);
 963                 iowrite32(vm->pte_encode(addr, level, true), &gtt_entries[i]);
 964                 i++;
 965         }
 966
 967         /* XXX: This serves as a posting read to make sure that the PTE has
 968          * actually been updated. There is some concern that even though
 969          * registers and PTEs are within the same BAR that they are potentially
 970          * of NUMA access patterns. Therefore, even with the way we assume
 971          * hardware should work, we must keep this posting read for paranoia.
 972          */
 973         if (i != 0)
 974                 WARN_ON(readl(&gtt_entries[i-1]) !=
 975                         vm->pte_encode(addr, level, true));
 976
 977         /* This next bit makes the above posting read even more important. We
 978          * want to flush the TLBs only after we're certain all the PTE updates
 979          * have finished.
 980          */
 981         I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
 982         POSTING_READ(GFX_FLSH_CNTL_GEN6);
 983 }
 984
 985 static void gen8_ggtt_clear_range(struct i915_address_space *vm,
 986                                   unsigned int first_entry,
 987                                   unsigned int num_entries,
 988                                   bool use_scratch)
 989 {
 990         struct drm_i915_private *dev_priv = vm->dev->dev_private;
 991         gen8_gtt_pte_t scratch_pte, __iomem *gtt_base =
 992                 (gen8_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
 993         const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
 994         int i;
 995
 996         if (WARN(num_entries > max_entries,
 997                  "First entry = %d; Num entries = %d (max=%d)\n",
 998                  first_entry, num_entries, max_entries))
 999                 num_entries = max_entries;
1000
1001         scratch_pte = gen8_pte_encode(vm->scratch.addr,
1002                                       I915_CACHE_LLC,
1003                                       use_scratch);
1004         for (i = 0; i < num_entries; i++)
1005                 gen8_set_pte(&gtt_base[i], scratch_pte);
1006         readl(gtt_base);
1007 }
1008
1009 static void gen6_ggtt_clear_range(struct i915_address_space *vm,
1010                                   unsigned int first_entry,
1011                                   unsigned int num_entries,
1012                                   bool use_scratch)
1013 {
1014         struct drm_i915_private *dev_priv = vm->dev->dev_private;
1015         gen6_gtt_pte_t scratch_pte, __iomem *gtt_base =
1016                 (gen6_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
1017         const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
1018         int i;
1019
1020         if (WARN(num_entries > max_entries,
1021                  "First entry = %d; Num entries = %d (max=%d)\n",
1022                  first_entry, num_entries, max_entries))
1023                 num_entries = max_entries;
1024
1025         scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, use_scratch);
1026
1027         for (i = 0; i < num_entries; i++)
1028                 iowrite32(scratch_pte, &gtt_base[i]);
1029         readl(gtt_base);
1030 }
1031
1032 static void i915_ggtt_insert_entries(struct i915_address_space *vm,
1033                                      struct sg_table *st,
1034                                      unsigned int pg_start,
1035                                      enum i915_cache_level cache_level)
1036 {
1037         unsigned int flags = (cache_level == I915_CACHE_NONE) ?
1038                 AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
1039
1040         intel_gtt_insert_sg_entries(st, pg_start, flags);
1041
1042 }
1043
1044 static void i915_ggtt_clear_range(struct i915_address_space *vm,
1045                                   unsigned int first_entry,
1046                                   unsigned int num_entries,
1047                                   bool unused)
1048 {
1049         intel_gtt_clear_range(first_entry, num_entries);
1050 }
1051
1052
1053 void i915_gem_gtt_bind_object(struct drm_i915_gem_object *obj,
1054                               enum i915_cache_level cache_level)
1055 {
1056         struct drm_device *dev = obj->base.dev;
1057         struct drm_i915_private *dev_priv = dev->dev_private;
1058         const unsigned long entry = i915_gem_obj_ggtt_offset(obj) >> PAGE_SHIFT;
1059
1060         dev_priv->gtt.base.insert_entries(&dev_priv->gtt.base, obj->pages,
1061                                           entry,
1062                                           cache_level);
1063
1064         obj->has_global_gtt_mapping = 1;
1065 }
1066
1067 void i915_gem_gtt_unbind_object(struct drm_i915_gem_object *obj)
1068 {
1069         struct drm_device *dev = obj->base.dev;
1070         struct drm_i915_private *dev_priv = dev->dev_private;
1071         const unsigned long entry = i915_gem_obj_ggtt_offset(obj) >> PAGE_SHIFT;
1072
1073         dev_priv->gtt.base.clear_range(&dev_priv->gtt.base,
1074                                        entry,
1075                                        obj->base.size >> PAGE_SHIFT,
1076                                        true);
1077
1078         obj->has_global_gtt_mapping = 0;
1079 }
1080
1081 void i915_gem_gtt_finish_object(struct drm_i915_gem_object *obj)
1082 {
1083         struct drm_device *dev = obj->base.dev;
1084         struct drm_i915_private *dev_priv = dev->dev_private;
1085         bool interruptible;
1086
1087         interruptible = do_idling(dev_priv);
1088
1089         if (!obj->has_dma_mapping)
1090                 dma_unmap_sg(&dev->pdev->dev,
1091                              obj->pages->sgl, obj->pages->nents,
1092                              PCI_DMA_BIDIRECTIONAL);
1093
1094         undo_idling(dev_priv, interruptible);
1095 }
1096
1097 static void i915_gtt_color_adjust(struct drm_mm_node *node,
1098                                   unsigned long color,
1099                                   unsigned long *start,
1100                                   unsigned long *end)
1101 {
1102         if (node->color != color)
1103                 *start += 4096;
1104
1105         if (!list_empty(&node->node_list)) {
1106                 node = list_entry(node->node_list.next,
1107                                   struct drm_mm_node,
1108                                   node_list);
1109                 if (node->allocated && node->color != color)
1110                         *end -= 4096;
1111         }
1112 }
1113
1114 void i915_gem_setup_global_gtt(struct drm_device *dev,
1115                                unsigned long start,
1116                                unsigned long mappable_end,
1117                                unsigned long end)
1118 {
1119         /* Let GEM Manage all of the aperture.
1120          *
1121          * However, leave one page at the end still bound to the scratch page.
1122          * There are a number of places where the hardware apparently prefetches
1123          * past the end of the object, and we've seen multiple hangs with the
1124          * GPU head pointer stuck in a batchbuffer bound at the last page of the
1125          * aperture.  One page should be enough to keep any prefetching inside
1126          * of the aperture.
1127          */
1128         struct drm_i915_private *dev_priv = dev->dev_private;
1129         struct i915_address_space *ggtt_vm = &dev_priv->gtt.base;
1130         struct drm_mm_node *entry;
1131         struct drm_i915_gem_object *obj;
1132         unsigned long hole_start, hole_end;
1133
1134         BUG_ON(mappable_end > end);
1135
1136         /* Subtract the guard page ... */
1137         drm_mm_init(&ggtt_vm->mm, start, end - start - PAGE_SIZE);
1138         if (!HAS_LLC(dev))
1139                 dev_priv->gtt.base.mm.color_adjust = i915_gtt_color_adjust;
1140
1141         /* Mark any preallocated objects as occupied */
1142         list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
1143                 struct i915_vma *vma = i915_gem_obj_to_vma(obj, ggtt_vm);
1144                 int ret;
1145                 DRM_DEBUG_KMS("reserving preallocated space: %lx + %zx\n",
1146                               i915_gem_obj_ggtt_offset(obj), obj->base.size);
1147
1148                 WARN_ON(i915_gem_obj_ggtt_bound(obj));
1149                 ret = drm_mm_reserve_node(&ggtt_vm->mm, &vma->node);
1150                 if (ret)
1151                         DRM_DEBUG_KMS("Reservation failed\n");
1152                 obj->has_global_gtt_mapping = 1;
1153         }
1154
1155         dev_priv->gtt.base.start = start;
1156         dev_priv->gtt.base.total = end - start;
1157
1158         /* Clear any non-preallocated blocks */
1159         drm_mm_for_each_hole(entry, &ggtt_vm->mm, hole_start, hole_end) {
1160                 const unsigned long count = (hole_end - hole_start) / PAGE_SIZE;
1161                 DRM_DEBUG_KMS("clearing unused GTT space: [%lx, %lx]\n",
1162                               hole_start, hole_end);
1163                 ggtt_vm->clear_range(ggtt_vm, hole_start / PAGE_SIZE, count, true);
1164         }
1165
1166         /* And finally clear the reserved guard page */
1167         ggtt_vm->clear_range(ggtt_vm, end / PAGE_SIZE - 1, 1, true);
1168 }
1169
1170 static bool
1171 intel_enable_ppgtt(struct drm_device *dev)
1172 {
1173         if (i915_enable_ppgtt >= 0)
1174                 return i915_enable_ppgtt;
1175
1176 #ifdef CONFIG_INTEL_IOMMU
1177         /* Disable ppgtt on SNB if VT-d is on. */
1178         if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped)
1179                 return false;
1180 #endif
1181
1182         return true;
1183 }
1184
1185 void i915_gem_init_global_gtt(struct drm_device *dev)
1186 {
1187         struct drm_i915_private *dev_priv = dev->dev_private;
1188         unsigned long gtt_size, mappable_size;
1189
1190         gtt_size = dev_priv->gtt.base.total;
1191         mappable_size = dev_priv->gtt.mappable_end;
1192
1193         if (intel_enable_ppgtt(dev) && HAS_ALIASING_PPGTT(dev)) {
1194                 int ret;
1195
1196                 if (INTEL_INFO(dev)->gen <= 7) {
1197                         /* PPGTT pdes are stolen from global gtt ptes, so shrink the
1198                          * aperture accordingly when using aliasing ppgtt. */
1199                         gtt_size -= GEN6_PPGTT_PD_ENTRIES * PAGE_SIZE;
1200                 }
1201
1202                 i915_gem_setup_global_gtt(dev, 0, mappable_size, gtt_size);
1203
1204                 ret = i915_gem_init_aliasing_ppgtt(dev);
1205                 if (!ret)
1206                         return;
1207
1208                 DRM_ERROR("Aliased PPGTT setup failed %d\n", ret);
1209                 drm_mm_takedown(&dev_priv->gtt.base.mm);
1210                 if (INTEL_INFO(dev)->gen < 8)
1211                         gtt_size += GEN6_PPGTT_PD_ENTRIES*PAGE_SIZE;
1212         }
1213         i915_gem_setup_global_gtt(dev, 0, mappable_size, gtt_size);
1214 }
1215
1216 static int setup_scratch_page(struct drm_device *dev)
1217 {
1218         struct drm_i915_private *dev_priv = dev->dev_private;
1219         struct page *page;
1220         dma_addr_t dma_addr;
1221
1222         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1223         if (page == NULL)
1224                 return -ENOMEM;
1225         get_page(page);
1226         set_pages_uc(page, 1);
1227
1228 #ifdef CONFIG_INTEL_IOMMU
1229         dma_addr = pci_map_page(dev->pdev, page, 0, PAGE_SIZE,
1230                                 PCI_DMA_BIDIRECTIONAL);
1231         if (pci_dma_mapping_error(dev->pdev, dma_addr))
1232                 return -EINVAL;
1233 #else
1234         dma_addr = page_to_phys(page);
1235 #endif
1236         dev_priv->gtt.base.scratch.page = page;
1237         dev_priv->gtt.base.scratch.addr = dma_addr;
1238
1239         return 0;
1240 }
1241
1242 static void teardown_scratch_page(struct drm_device *dev)
1243 {
1244         struct drm_i915_private *dev_priv = dev->dev_private;
1245         struct page *page = dev_priv->gtt.base.scratch.page;
1246
1247         set_pages_wb(page, 1);
1248         pci_unmap_page(dev->pdev, dev_priv->gtt.base.scratch.addr,
1249                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
1250         put_page(page);
1251         __free_page(page);
1252 }
1253
1254 static inline unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl)
1255 {
1256         snb_gmch_ctl >>= SNB_GMCH_GGMS_SHIFT;
1257         snb_gmch_ctl &= SNB_GMCH_GGMS_MASK;
1258         return snb_gmch_ctl << 20;
1259 }
1260
1261 static inline unsigned int gen8_get_total_gtt_size(u16 bdw_gmch_ctl)
1262 {
1263         bdw_gmch_ctl >>= BDW_GMCH_GGMS_SHIFT;
1264         bdw_gmch_ctl &= BDW_GMCH_GGMS_MASK;
1265         if (bdw_gmch_ctl)
1266                 bdw_gmch_ctl = 1 << bdw_gmch_ctl;
1267         if (bdw_gmch_ctl > 4) {
1268                 WARN_ON(!i915_preliminary_hw_support);
1269                 return 4<<20;
1270         }
1271
1272         return bdw_gmch_ctl << 20;
1273 }
1274
1275 static inline size_t gen6_get_stolen_size(u16 snb_gmch_ctl)
1276 {
1277         snb_gmch_ctl >>= SNB_GMCH_GMS_SHIFT;
1278         snb_gmch_ctl &= SNB_GMCH_GMS_MASK;
1279         return snb_gmch_ctl << 25; /* 32 MB units */
1280 }
1281
1282 static inline size_t gen8_get_stolen_size(u16 bdw_gmch_ctl)
1283 {
1284         bdw_gmch_ctl >>= BDW_GMCH_GMS_SHIFT;
1285         bdw_gmch_ctl &= BDW_GMCH_GMS_MASK;
1286         return bdw_gmch_ctl << 25; /* 32 MB units */
1287 }
1288
1289 static int ggtt_probe_common(struct drm_device *dev,
1290                              size_t gtt_size)
1291 {
1292         struct drm_i915_private *dev_priv = dev->dev_private;
1293         phys_addr_t gtt_phys_addr;
1294         int ret;
1295
1296         /* For Modern GENs the PTEs and register space are split in the BAR */
1297         gtt_phys_addr = pci_resource_start(dev->pdev, 0) +
1298                 (pci_resource_len(dev->pdev, 0) / 2);
1299
1300         dev_priv->gtt.gsm = ioremap_wc(gtt_phys_addr, gtt_size);
1301         if (!dev_priv->gtt.gsm) {
1302                 DRM_ERROR("Failed to map the gtt page table\n");
1303                 return -ENOMEM;
1304         }
1305
1306         ret = setup_scratch_page(dev);
1307         if (ret) {
1308                 DRM_ERROR("Scratch setup failed\n");
1309                 /* iounmap will also get called at remove, but meh */
1310                 iounmap(dev_priv->gtt.gsm);
1311         }
1312
1313         return ret;
1314 }
1315
1316 /* The GGTT and PPGTT need a private PPAT setup in order to handle cacheability
1317  * bits. When using advanced contexts each context stores its own PAT, but
1318  * writing this data shouldn't be harmful even in those cases. */
1319 static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv)
1320 {
1321 #define GEN8_PPAT_UC            (0<<0)
1322 #define GEN8_PPAT_WC            (1<<0)
1323 #define GEN8_PPAT_WT            (2<<0)
1324 #define GEN8_PPAT_WB            (3<<0)
1325 #define GEN8_PPAT_ELLC_OVERRIDE (0<<2)
1326 /* FIXME(BDW): Bspec is completely confused about cache control bits. */
1327 #define GEN8_PPAT_LLC           (1<<2)
1328 #define GEN8_PPAT_LLCELLC       (2<<2)
1329 #define GEN8_PPAT_LLCeLLC       (3<<2)
1330 #define GEN8_PPAT_AGE(x)        (x<<4)
1331 #define GEN8_PPAT(i, x) ((uint64_t) (x) << ((i) * 8))
1332         uint64_t pat;
1333
1334         pat = GEN8_PPAT(0, GEN8_PPAT_WB | GEN8_PPAT_LLC)     | /* for normal objects, no eLLC */
1335               GEN8_PPAT(1, GEN8_PPAT_WC | GEN8_PPAT_LLCELLC) | /* for something pointing to ptes? */
1336               GEN8_PPAT(2, GEN8_PPAT_WT | GEN8_PPAT_LLCELLC) | /* for scanout with eLLC */
1337               GEN8_PPAT(3, GEN8_PPAT_UC)                     | /* Uncached objects, mostly for scanout */
1338               GEN8_PPAT(4, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(0)) |
1339               GEN8_PPAT(5, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(1)) |
1340               GEN8_PPAT(6, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(2)) |
1341               GEN8_PPAT(7, GEN8_PPAT_WB | GEN8_PPAT_LLCELLC | GEN8_PPAT_AGE(3));
1342
1343         /* XXX: spec defines this as 2 distinct registers. It's unclear if a 64b
1344          * write would work. */
1345         I915_WRITE(GEN8_PRIVATE_PAT, pat);
1346         I915_WRITE(GEN8_PRIVATE_PAT + 4, pat >> 32);
1347 }
1348
1349 static int gen8_gmch_probe(struct drm_device *dev,
1350                            size_t *gtt_total,
1351                            size_t *stolen,
1352                            phys_addr_t *mappable_base,
1353                            unsigned long *mappable_end)
1354 {
1355         struct drm_i915_private *dev_priv = dev->dev_private;
1356         unsigned int gtt_size;
1357         u16 snb_gmch_ctl;
1358         int ret;
1359
1360         /* TODO: We're not aware of mappable constraints on gen8 yet */
1361         *mappable_base = pci_resource_start(dev->pdev, 2);
1362         *mappable_end = pci_resource_len(dev->pdev, 2);
1363
1364         if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(39)))
1365                 pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(39));
1366
1367         pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
1368
1369         *stolen = gen8_get_stolen_size(snb_gmch_ctl);
1370
1371         gtt_size = gen8_get_total_gtt_size(snb_gmch_ctl);
1372         *gtt_total = (gtt_size / sizeof(gen8_gtt_pte_t)) << PAGE_SHIFT;
1373
1374         gen8_setup_private_ppat(dev_priv);
1375
1376         ret = ggtt_probe_common(dev, gtt_size);
1377
1378         dev_priv->gtt.base.clear_range = gen8_ggtt_clear_range;
1379         dev_priv->gtt.base.insert_entries = gen8_ggtt_insert_entries;
1380
1381         return ret;
1382 }
1383
1384 static int gen6_gmch_probe(struct drm_device *dev,
1385                            size_t *gtt_total,
1386                            size_t *stolen,
1387                            phys_addr_t *mappable_base,
1388                            unsigned long *mappable_end)
1389 {
1390         struct drm_i915_private *dev_priv = dev->dev_private;
1391         unsigned int gtt_size;
1392         u16 snb_gmch_ctl;
1393         int ret;
1394
1395         *mappable_base = pci_resource_start(dev->pdev, 2);
1396         *mappable_end = pci_resource_len(dev->pdev, 2);
1397
1398         /* 64/512MB is the current min/max we actually know of, but this is just
1399          * a coarse sanity check.
1400          */
1401         if ((*mappable_end < (64<<20) || (*mappable_end > (512<<20)))) {
1402                 DRM_ERROR("Unknown GMADR size (%lx)\n",
1403                           dev_priv->gtt.mappable_end);
1404                 return -ENXIO;
1405         }
1406
1407         if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(40)))
1408                 pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(40));
1409         pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
1410
1411         *stolen = gen6_get_stolen_size(snb_gmch_ctl);
1412
1413         gtt_size = gen6_get_total_gtt_size(snb_gmch_ctl);
1414         *gtt_total = (gtt_size / sizeof(gen6_gtt_pte_t)) << PAGE_SHIFT;
1415
1416         ret = ggtt_probe_common(dev, gtt_size);
1417
1418         dev_priv->gtt.base.clear_range = gen6_ggtt_clear_range;
1419         dev_priv->gtt.base.insert_entries = gen6_ggtt_insert_entries;
1420
1421         return ret;
1422 }
1423
1424 static void gen6_gmch_remove(struct i915_address_space *vm)
1425 {
1426
1427         struct i915_gtt *gtt = container_of(vm, struct i915_gtt, base);
1428
1429         drm_mm_takedown(&vm->mm);
1430         iounmap(gtt->gsm);
1431         teardown_scratch_page(vm->dev);
1432 }
1433
1434 static int i915_gmch_probe(struct drm_device *dev,
1435                            size_t *gtt_total,
1436                            size_t *stolen,
1437                            phys_addr_t *mappable_base,
1438                            unsigned long *mappable_end)
1439 {
1440         struct drm_i915_private *dev_priv = dev->dev_private;
1441         int ret;
1442
1443         ret = intel_gmch_probe(dev_priv->bridge_dev, dev_priv->dev->pdev, NULL);
1444         if (!ret) {
1445                 DRM_ERROR("failed to set up gmch\n");
1446                 return -EIO;
1447         }
1448
1449         intel_gtt_get(gtt_total, stolen, mappable_base, mappable_end);
1450
1451         dev_priv->gtt.do_idle_maps = needs_idle_maps(dev_priv->dev);
1452         dev_priv->gtt.base.clear_range = i915_ggtt_clear_range;
1453         dev_priv->gtt.base.insert_entries = i915_ggtt_insert_entries;
1454
1455         if (unlikely(dev_priv->gtt.do_idle_maps))
1456                 DRM_INFO("applying Ironlake quirks for intel_iommu\n");
1457
1458         return 0;
1459 }
1460
1461 static void i915_gmch_remove(struct i915_address_space *vm)
1462 {
1463         intel_gmch_remove();
1464 }
1465
1466 int i915_gem_gtt_init(struct drm_device *dev)
1467 {
1468         struct drm_i915_private *dev_priv = dev->dev_private;
1469         struct i915_gtt *gtt = &dev_priv->gtt;
1470         int ret;
1471
1472         if (INTEL_INFO(dev)->gen <= 5) {
1473                 gtt->gtt_probe = i915_gmch_probe;
1474                 gtt->base.cleanup = i915_gmch_remove;
1475         } else if (INTEL_INFO(dev)->gen < 8) {
1476                 gtt->gtt_probe = gen6_gmch_probe;
1477                 gtt->base.cleanup = gen6_gmch_remove;
1478                 if (IS_HASWELL(dev) && dev_priv->ellc_size)
1479                         gtt->base.pte_encode = iris_pte_encode;
1480                 else if (IS_HASWELL(dev))
1481                         gtt->base.pte_encode = hsw_pte_encode;
1482                 else if (IS_VALLEYVIEW(dev))
1483                         gtt->base.pte_encode = byt_pte_encode;
1484                 else if (INTEL_INFO(dev)->gen >= 7)
1485                         gtt->base.pte_encode = ivb_pte_encode;
1486                 else
1487                         gtt->base.pte_encode = snb_pte_encode;
1488         } else {
1489                 dev_priv->gtt.gtt_probe = gen8_gmch_probe;
1490                 dev_priv->gtt.base.cleanup = gen6_gmch_remove;
1491         }
1492
1493         ret = gtt->gtt_probe(dev, &gtt->base.total, &gtt->stolen_size,
1494                              &gtt->mappable_base, &gtt->mappable_end);
1495         if (ret)
1496                 return ret;
1497
1498         gtt->base.dev = dev;
1499
1500         /* GMADR is the PCI mmio aperture into the global GTT. */
1501         DRM_INFO("Memory usable by graphics device = %zdM\n",
1502                  gtt->base.total >> 20);
1503         DRM_DEBUG_DRIVER("GMADR size = %ldM\n", gtt->mappable_end >> 20);
1504         DRM_DEBUG_DRIVER("GTT stolen size = %zdM\n", gtt->stolen_size >> 20);
1505
1506         return 0;
1507 }