drivers/char/agp/intel-gtt.c

   1 /*
   2  * Intel GTT (Graphics Translation Table) routines
   3  *
   4  * Caveat: This driver implements the linux agp interface, but this is far from
   5  * a agp driver! GTT support ended up here for purely historical reasons: The
   6  * old userspace intel graphics drivers needed an interface to map memory into
   7  * the GTT. And the drm provides a default interface for graphic devices sitting
   8  * on an agp port. So it made sense to fake the GTT support as an agp port to
   9  * avoid having to create a new api.
  10  *
  11  * With gem this does not make much sense anymore, just needlessly complicates
  12  * the code. But as long as the old graphics stack is still support, it's stuck
  13  * here.
  14  *
  15  * /fairy-tale-mode off
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/pci.h>
  20 #include <linux/kernel.h>
  21 #include <linux/pagemap.h>
  22 #include <linux/agp_backend.h>
  23 #include <linux/delay.h>
  24 #include <asm/smp.h>
  25 #include "agp.h"
  26 #include "intel-agp.h"
  27 #include <drm/intel-gtt.h>
  28
  29 /*
  30  * If we have Intel graphics, we're not going to have anything other than
  31  * an Intel IOMMU. So make the correct use of the PCI DMA API contingent
  32  * on the Intel IOMMU support (CONFIG_INTEL_IOMMU).
  33  * Only newer chipsets need to bother with this, of course.
  34  */
  35 #ifdef CONFIG_INTEL_IOMMU
  36 #define USE_PCI_DMA_API 1
  37 #else
  38 #define USE_PCI_DMA_API 0
  39 #endif
  40
  41 struct intel_gtt_driver {
  42         unsigned int gen : 8;
  43         unsigned int is_g33 : 1;
  44         unsigned int is_pineview : 1;
  45         unsigned int is_ironlake : 1;
  46         unsigned int has_pgtbl_enable : 1;
  47         unsigned int dma_mask_size : 8;
  48         /* Chipset specific GTT setup */
  49         int (*setup)(void);
  50         /* This should undo anything done in ->setup() save the unmapping
  51          * of the mmio register file, that's done in the generic code. */
  52         void (*cleanup)(void);
  53         void (*write_entry)(dma_addr_t addr, unsigned int entry, unsigned int flags);
  54         /* Flags is a more or less chipset specific opaque value.
  55          * For chipsets that need to support old ums (non-gem) code, this
  56          * needs to be identical to the various supported agp memory types! */
  57         bool (*check_flags)(unsigned int flags);
  58         void (*chipset_flush)(void);
  59 };
  60
  61 static struct _intel_private {
  62         const struct intel_gtt_driver *driver;
  63         struct pci_dev *pcidev; /* device one */
  64         struct pci_dev *bridge_dev;
  65         u8 __iomem *registers;
  66         phys_addr_t gtt_phys_addr;
  67         u32 PGETBL_save;
  68         u32 __iomem *gtt;               /* I915G */
  69         bool clear_fake_agp; /* on first access via agp, fill with scratch */
  70         int num_dcache_entries;
  71         void __iomem *i9xx_flush_page;
  72         char *i81x_gtt_table;
  73         struct resource ifp_resource;
  74         int resource_valid;
  75         struct page *scratch_page;
  76         phys_addr_t scratch_page_dma;
  77         int refcount;
  78         /* Whether i915 needs to use the dmar apis or not. */
  79         unsigned int needs_dmar : 1;
  80         phys_addr_t gma_bus_addr;
  81         /*  Size of memory reserved for graphics by the BIOS */
  82         unsigned int stolen_size;
  83         /* Total number of gtt entries. */
  84         unsigned int gtt_total_entries;
  85         /* Part of the gtt that is mappable by the cpu, for those chips where
  86          * this is not the full gtt. */
  87         unsigned int gtt_mappable_entries;
  88 } intel_private;
  89
  90 #define INTEL_GTT_GEN   intel_private.driver->gen
  91 #define IS_G33          intel_private.driver->is_g33
  92 #define IS_PINEVIEW     intel_private.driver->is_pineview
  93 #define IS_IRONLAKE     intel_private.driver->is_ironlake
  94 #define HAS_PGTBL_EN    intel_private.driver->has_pgtbl_enable
  95
  96 #if IS_ENABLED(CONFIG_AGP_INTEL)
  97 static int intel_gtt_map_memory(struct page **pages,
  98                                 unsigned int num_entries,
  99                                 struct sg_table *st)
 100 {
 101         struct scatterlist *sg;
 102         int i;
 103
 104         DBG("try mapping %lu pages\n", (unsigned long)num_entries);
 105
 106         if (sg_alloc_table(st, num_entries, GFP_KERNEL))
 107                 goto err;
 108
 109         for_each_sg(st->sgl, sg, num_entries, i)
 110                 sg_set_page(sg, pages[i], PAGE_SIZE, 0);
 111
 112         if (!pci_map_sg(intel_private.pcidev,
 113                         st->sgl, st->nents, PCI_DMA_BIDIRECTIONAL))
 114                 goto err;
 115
 116         return 0;
 117
 118 err:
 119         sg_free_table(st);
 120         return -ENOMEM;
 121 }
 122
 123 static void intel_gtt_unmap_memory(struct scatterlist *sg_list, int num_sg)
 124 {
 125         struct sg_table st;
 126         DBG("try unmapping %lu pages\n", (unsigned long)mem->page_count);
 127
 128         pci_unmap_sg(intel_private.pcidev, sg_list,
 129                      num_sg, PCI_DMA_BIDIRECTIONAL);
 130
 131         st.sgl = sg_list;
 132         st.orig_nents = st.nents = num_sg;
 133
 134         sg_free_table(&st);
 135 }
 136
 137 static void intel_fake_agp_enable(struct agp_bridge_data *bridge, u32 mode)
 138 {
 139         return;
 140 }
 141
 142 /* Exists to support ARGB cursors */
 143 static struct page *i8xx_alloc_pages(void)
 144 {
 145         struct page *page;
 146
 147         page = alloc_pages(GFP_KERNEL | GFP_DMA32, 2);
 148         if (page == NULL)
 149                 return NULL;
 150
 151         if (set_pages_uc(page, 4) < 0) {
 152                 set_pages_wb(page, 4);
 153                 __free_pages(page, 2);
 154                 return NULL;
 155         }
 156         atomic_inc(&agp_bridge->current_memory_agp);
 157         return page;
 158 }
 159
 160 static void i8xx_destroy_pages(struct page *page)
 161 {
 162         if (page == NULL)
 163                 return;
 164
 165         set_pages_wb(page, 4);
 166         __free_pages(page, 2);
 167         atomic_dec(&agp_bridge->current_memory_agp);
 168 }
 169 #endif
 170
 171 #define I810_GTT_ORDER 4
 172 static int i810_setup(void)
 173 {
 174         phys_addr_t reg_addr;
 175         char *gtt_table;
 176
 177         /* i81x does not preallocate the gtt. It's always 64kb in size. */
 178         gtt_table = alloc_gatt_pages(I810_GTT_ORDER);
 179         if (gtt_table == NULL)
 180                 return -ENOMEM;
 181         intel_private.i81x_gtt_table = gtt_table;
 182
 183         reg_addr = pci_resource_start(intel_private.pcidev, I810_MMADR_BAR);
 184
 185         intel_private.registers = ioremap(reg_addr, KB(64));
 186         if (!intel_private.registers)
 187                 return -ENOMEM;
 188
 189         writel(virt_to_phys(gtt_table) | I810_PGETBL_ENABLED,
 190                intel_private.registers+I810_PGETBL_CTL);
 191
 192         intel_private.gtt_phys_addr = reg_addr + I810_PTE_BASE;
 193
 194         if ((readl(intel_private.registers+I810_DRAM_CTL)
 195                 & I810_DRAM_ROW_0) == I810_DRAM_ROW_0_SDRAM) {
 196                 dev_info(&intel_private.pcidev->dev,
 197                          "detected 4MB dedicated video ram\n");
 198                 intel_private.num_dcache_entries = 1024;
 199         }
 200
 201         return 0;
 202 }
 203
 204 static void i810_cleanup(void)
 205 {
 206         writel(0, intel_private.registers+I810_PGETBL_CTL);
 207         free_gatt_pages(intel_private.i81x_gtt_table, I810_GTT_ORDER);
 208 }
 209
 210 #if IS_ENABLED(CONFIG_AGP_INTEL)
 211 static int i810_insert_dcache_entries(struct agp_memory *mem, off_t pg_start,
 212                                       int type)
 213 {
 214         int i;
 215
 216         if ((pg_start + mem->page_count)
 217                         > intel_private.num_dcache_entries)
 218                 return -EINVAL;
 219
 220         if (!mem->is_flushed)
 221                 global_cache_flush();
 222
 223         for (i = pg_start; i < (pg_start + mem->page_count); i++) {
 224                 dma_addr_t addr = i << PAGE_SHIFT;
 225                 intel_private.driver->write_entry(addr,
 226                                                   i, type);
 227         }
 228         wmb();
 229
 230         return 0;
 231 }
 232
 233 /*
 234  * The i810/i830 requires a physical address to program its mouse
 235  * pointer into hardware.
 236  * However the Xserver still writes to it through the agp aperture.
 237  */
 238 static struct agp_memory *alloc_agpphysmem_i8xx(size_t pg_count, int type)
 239 {
 240         struct agp_memory *new;
 241         struct page *page;
 242
 243         switch (pg_count) {
 244         case 1: page = agp_bridge->driver->agp_alloc_page(agp_bridge);
 245                 break;
 246         case 4:
 247                 /* kludge to get 4 physical pages for ARGB cursor */
 248                 page = i8xx_alloc_pages();
 249                 break;
 250         default:
 251                 return NULL;
 252         }
 253
 254         if (page == NULL)
 255                 return NULL;
 256
 257         new = agp_create_memory(pg_count);
 258         if (new == NULL)
 259                 return NULL;
 260
 261         new->pages[0] = page;
 262         if (pg_count == 4) {
 263                 /* kludge to get 4 physical pages for ARGB cursor */
 264                 new->pages[1] = new->pages[0] + 1;
 265                 new->pages[2] = new->pages[1] + 1;
 266                 new->pages[3] = new->pages[2] + 1;
 267         }
 268         new->page_count = pg_count;
 269         new->num_scratch_pages = pg_count;
 270         new->type = AGP_PHYS_MEMORY;
 271         new->physical = page_to_phys(new->pages[0]);
 272         return new;
 273 }
 274
 275 static void intel_i810_free_by_type(struct agp_memory *curr)
 276 {
 277         agp_free_key(curr->key);
 278         if (curr->type == AGP_PHYS_MEMORY) {
 279                 if (curr->page_count == 4)
 280                         i8xx_destroy_pages(curr->pages[0]);
 281                 else {
 282                         agp_bridge->driver->agp_destroy_page(curr->pages[0],
 283                                                              AGP_PAGE_DESTROY_UNMAP);
 284                         agp_bridge->driver->agp_destroy_page(curr->pages[0],
 285                                                              AGP_PAGE_DESTROY_FREE);
 286                 }
 287                 agp_free_page_array(curr);
 288         }
 289         kfree(curr);
 290 }
 291 #endif
 292
 293 static int intel_gtt_setup_scratch_page(void)
 294 {
 295         struct page *page;
 296         dma_addr_t dma_addr;
 297
 298         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
 299         if (page == NULL)
 300                 return -ENOMEM;
 301         set_pages_uc(page, 1);
 302
 303         if (intel_private.needs_dmar) {
 304                 dma_addr = pci_map_page(intel_private.pcidev, page, 0,
 305                                     PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 306                 if (pci_dma_mapping_error(intel_private.pcidev, dma_addr))
 307                         return -EINVAL;
 308
 309                 intel_private.scratch_page_dma = dma_addr;
 310         } else
 311                 intel_private.scratch_page_dma = page_to_phys(page);
 312
 313         intel_private.scratch_page = page;
 314
 315         return 0;
 316 }
 317
 318 static void i810_write_entry(dma_addr_t addr, unsigned int entry,
 319                              unsigned int flags)
 320 {
 321         u32 pte_flags = I810_PTE_VALID;
 322
 323         switch (flags) {
 324         case AGP_DCACHE_MEMORY:
 325                 pte_flags |= I810_PTE_LOCAL;
 326                 break;
 327         case AGP_USER_CACHED_MEMORY:
 328                 pte_flags |= I830_PTE_SYSTEM_CACHED;
 329                 break;
 330         }
 331
 332         writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
 333 }
 334
 335 static const struct aper_size_info_fixed intel_fake_agp_sizes[] = {
 336         {32, 8192, 3},
 337         {64, 16384, 4},
 338         {128, 32768, 5},
 339         {256, 65536, 6},
 340         {512, 131072, 7},
 341 };
 342
 343 static unsigned int intel_gtt_stolen_size(void)
 344 {
 345         u16 gmch_ctrl;
 346         u8 rdct;
 347         int local = 0;
 348         static const int ddt[4] = { 0, 16, 32, 64 };
 349         unsigned int stolen_size = 0;
 350
 351         if (INTEL_GTT_GEN == 1)
 352                 return 0; /* no stolen mem on i81x */
 353
 354         pci_read_config_word(intel_private.bridge_dev,
 355                              I830_GMCH_CTRL, &gmch_ctrl);
 356
 357         if (intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82830_HB ||
 358             intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82845G_HB) {
 359                 switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
 360                 case I830_GMCH_GMS_STOLEN_512:
 361                         stolen_size = KB(512);
 362                         break;
 363                 case I830_GMCH_GMS_STOLEN_1024:
 364                         stolen_size = MB(1);
 365                         break;
 366                 case I830_GMCH_GMS_STOLEN_8192:
 367                         stolen_size = MB(8);
 368                         break;
 369                 case I830_GMCH_GMS_LOCAL:
 370                         rdct = readb(intel_private.registers+I830_RDRAM_CHANNEL_TYPE);
 371                         stolen_size = (I830_RDRAM_ND(rdct) + 1) *
 372                                         MB(ddt[I830_RDRAM_DDT(rdct)]);
 373                         local = 1;
 374                         break;
 375                 default:
 376                         stolen_size = 0;
 377                         break;
 378                 }
 379         } else {
 380                 switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
 381                 case I855_GMCH_GMS_STOLEN_1M:
 382                         stolen_size = MB(1);
 383                         break;
 384                 case I855_GMCH_GMS_STOLEN_4M:
 385                         stolen_size = MB(4);
 386                         break;
 387                 case I855_GMCH_GMS_STOLEN_8M:
 388                         stolen_size = MB(8);
 389                         break;
 390                 case I855_GMCH_GMS_STOLEN_16M:
 391                         stolen_size = MB(16);
 392                         break;
 393                 case I855_GMCH_GMS_STOLEN_32M:
 394                         stolen_size = MB(32);
 395                         break;
 396                 case I915_GMCH_GMS_STOLEN_48M:
 397                         stolen_size = MB(48);
 398                         break;
 399                 case I915_GMCH_GMS_STOLEN_64M:
 400                         stolen_size = MB(64);
 401                         break;
 402                 case G33_GMCH_GMS_STOLEN_128M:
 403                         stolen_size = MB(128);
 404                         break;
 405                 case G33_GMCH_GMS_STOLEN_256M:
 406                         stolen_size = MB(256);
 407                         break;
 408                 case INTEL_GMCH_GMS_STOLEN_96M:
 409                         stolen_size = MB(96);
 410                         break;
 411                 case INTEL_GMCH_GMS_STOLEN_160M:
 412                         stolen_size = MB(160);
 413                         break;
 414                 case INTEL_GMCH_GMS_STOLEN_224M:
 415                         stolen_size = MB(224);
 416                         break;
 417                 case INTEL_GMCH_GMS_STOLEN_352M:
 418                         stolen_size = MB(352);
 419                         break;
 420                 default:
 421                         stolen_size = 0;
 422                         break;
 423                 }
 424         }
 425
 426         if (stolen_size > 0) {
 427                 dev_info(&intel_private.bridge_dev->dev, "detected %dK %s memory\n",
 428                        stolen_size / KB(1), local ? "local" : "stolen");
 429         } else {
 430                 dev_info(&intel_private.bridge_dev->dev,
 431                        "no pre-allocated video memory detected\n");
 432                 stolen_size = 0;
 433         }
 434
 435         return stolen_size;
 436 }
 437
 438 static void i965_adjust_pgetbl_size(unsigned int size_flag)
 439 {
 440         u32 pgetbl_ctl, pgetbl_ctl2;
 441
 442         /* ensure that ppgtt is disabled */
 443         pgetbl_ctl2 = readl(intel_private.registers+I965_PGETBL_CTL2);
 444         pgetbl_ctl2 &= ~I810_PGETBL_ENABLED;
 445         writel(pgetbl_ctl2, intel_private.registers+I965_PGETBL_CTL2);
 446
 447         /* write the new ggtt size */
 448         pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
 449         pgetbl_ctl &= ~I965_PGETBL_SIZE_MASK;
 450         pgetbl_ctl |= size_flag;
 451         writel(pgetbl_ctl, intel_private.registers+I810_PGETBL_CTL);
 452 }
 453
 454 static unsigned int i965_gtt_total_entries(void)
 455 {
 456         int size;
 457         u32 pgetbl_ctl;
 458         u16 gmch_ctl;
 459
 460         pci_read_config_word(intel_private.bridge_dev,
 461                              I830_GMCH_CTRL, &gmch_ctl);
 462
 463         if (INTEL_GTT_GEN == 5) {
 464                 switch (gmch_ctl & G4x_GMCH_SIZE_MASK) {
 465                 case G4x_GMCH_SIZE_1M:
 466                 case G4x_GMCH_SIZE_VT_1M:
 467                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1MB);
 468                         break;
 469                 case G4x_GMCH_SIZE_VT_1_5M:
 470                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1_5MB);
 471                         break;
 472                 case G4x_GMCH_SIZE_2M:
 473                 case G4x_GMCH_SIZE_VT_2M:
 474                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_2MB);
 475                         break;
 476                 }
 477         }
 478
 479         pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
 480
 481         switch (pgetbl_ctl & I965_PGETBL_SIZE_MASK) {
 482         case I965_PGETBL_SIZE_128KB:
 483                 size = KB(128);
 484                 break;
 485         case I965_PGETBL_SIZE_256KB:
 486                 size = KB(256);
 487                 break;
 488         case I965_PGETBL_SIZE_512KB:
 489                 size = KB(512);
 490                 break;
 491         /* GTT pagetable sizes bigger than 512KB are not possible on G33! */
 492         case I965_PGETBL_SIZE_1MB:
 493                 size = KB(1024);
 494                 break;
 495         case I965_PGETBL_SIZE_2MB:
 496                 size = KB(2048);
 497                 break;
 498         case I965_PGETBL_SIZE_1_5MB:
 499                 size = KB(1024 + 512);
 500                 break;
 501         default:
 502                 dev_info(&intel_private.pcidev->dev,
 503                          "unknown page table size, assuming 512KB\n");
 504                 size = KB(512);
 505         }
 506
 507         return size/4;
 508 }
 509
 510 static unsigned int intel_gtt_total_entries(void)
 511 {
 512         if (IS_G33 || INTEL_GTT_GEN == 4 || INTEL_GTT_GEN == 5)
 513                 return i965_gtt_total_entries();
 514         else {
 515                 /* On previous hardware, the GTT size was just what was
 516                  * required to map the aperture.
 517                  */
 518                 return intel_private.gtt_mappable_entries;
 519         }
 520 }
 521
 522 static unsigned int intel_gtt_mappable_entries(void)
 523 {
 524         unsigned int aperture_size;
 525
 526         if (INTEL_GTT_GEN == 1) {
 527                 u32 smram_miscc;
 528
 529                 pci_read_config_dword(intel_private.bridge_dev,
 530                                       I810_SMRAM_MISCC, &smram_miscc);
 531
 532                 if ((smram_miscc & I810_GFX_MEM_WIN_SIZE)
 533                                 == I810_GFX_MEM_WIN_32M)
 534                         aperture_size = MB(32);
 535                 else
 536                         aperture_size = MB(64);
 537         } else if (INTEL_GTT_GEN == 2) {
 538                 u16 gmch_ctrl;
 539
 540                 pci_read_config_word(intel_private.bridge_dev,
 541                                      I830_GMCH_CTRL, &gmch_ctrl);
 542
 543                 if ((gmch_ctrl & I830_GMCH_MEM_MASK) == I830_GMCH_MEM_64M)
 544                         aperture_size = MB(64);
 545                 else
 546                         aperture_size = MB(128);
 547         } else {
 548                 /* 9xx supports large sizes, just look at the length */
 549                 aperture_size = pci_resource_len(intel_private.pcidev, 2);
 550         }
 551
 552         return aperture_size >> PAGE_SHIFT;
 553 }
 554
 555 static void intel_gtt_teardown_scratch_page(void)
 556 {
 557         set_pages_wb(intel_private.scratch_page, 1);
 558         if (intel_private.needs_dmar)
 559                 pci_unmap_page(intel_private.pcidev,
 560                                intel_private.scratch_page_dma,
 561                                PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 562         __free_page(intel_private.scratch_page);
 563 }
 564
 565 static void intel_gtt_cleanup(void)
 566 {
 567         intel_private.driver->cleanup();
 568
 569         iounmap(intel_private.gtt);
 570         iounmap(intel_private.registers);
 571
 572         intel_gtt_teardown_scratch_page();
 573 }
 574
 575 /* Certain Gen5 chipsets require require idling the GPU before
 576  * unmapping anything from the GTT when VT-d is enabled.
 577  */
 578 static inline int needs_ilk_vtd_wa(void)
 579 {
 580 #ifdef CONFIG_INTEL_IOMMU
 581         const unsigned short gpu_devid = intel_private.pcidev->device;
 582
 583         /* Query intel_iommu to see if we need the workaround. Presumably that
 584          * was loaded first.
 585          */
 586         if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG ||
 587              gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
 588              intel_iommu_gfx_mapped)
 589                 return 1;
 590 #endif
 591         return 0;
 592 }
 593
 594 static bool intel_gtt_can_wc(void)
 595 {
 596         if (INTEL_GTT_GEN <= 2)
 597                 return false;
 598
 599         if (INTEL_GTT_GEN >= 6)
 600                 return false;
 601
 602         /* Reports of major corruption with ILK vt'd enabled */
 603         if (needs_ilk_vtd_wa())
 604                 return false;
 605
 606         return true;
 607 }
 608
 609 static int intel_gtt_init(void)
 610 {
 611         u32 gtt_map_size;
 612         int ret, bar;
 613
 614         ret = intel_private.driver->setup();
 615         if (ret != 0)
 616                 return ret;
 617
 618         intel_private.gtt_mappable_entries = intel_gtt_mappable_entries();
 619         intel_private.gtt_total_entries = intel_gtt_total_entries();
 620
 621         /* save the PGETBL reg for resume */
 622         intel_private.PGETBL_save =
 623                 readl(intel_private.registers+I810_PGETBL_CTL)
 624                         & ~I810_PGETBL_ENABLED;
 625         /* we only ever restore the register when enabling the PGTBL... */
 626         if (HAS_PGTBL_EN)
 627                 intel_private.PGETBL_save |= I810_PGETBL_ENABLED;
 628
 629         dev_info(&intel_private.bridge_dev->dev,
 630                         "detected gtt size: %dK total, %dK mappable\n",
 631                         intel_private.gtt_total_entries * 4,
 632                         intel_private.gtt_mappable_entries * 4);
 633
 634         gtt_map_size = intel_private.gtt_total_entries * 4;
 635
 636         intel_private.gtt = NULL;
 637         if (intel_gtt_can_wc())
 638                 intel_private.gtt = ioremap_wc(intel_private.gtt_phys_addr,
 639                                                gtt_map_size);
 640         if (intel_private.gtt == NULL)
 641                 intel_private.gtt = ioremap(intel_private.gtt_phys_addr,
 642                                             gtt_map_size);
 643         if (intel_private.gtt == NULL) {
 644                 intel_private.driver->cleanup();
 645                 iounmap(intel_private.registers);
 646                 return -ENOMEM;
 647         }
 648
 649 #if IS_ENABLED(CONFIG_AGP_INTEL)
 650         global_cache_flush();   /* FIXME: ? */
 651 #endif
 652
 653         intel_private.stolen_size = intel_gtt_stolen_size();
 654
 655         intel_private.needs_dmar = USE_PCI_DMA_API && INTEL_GTT_GEN > 2;
 656
 657         ret = intel_gtt_setup_scratch_page();
 658         if (ret != 0) {
 659                 intel_gtt_cleanup();
 660                 return ret;
 661         }
 662
 663         if (INTEL_GTT_GEN <= 2)
 664                 bar = I810_GMADR_BAR;
 665         else
 666                 bar = I915_GMADR_BAR;
 667
 668         intel_private.gma_bus_addr = pci_bus_address(intel_private.pcidev, bar);
 669         return 0;
 670 }
 671
 672 #if IS_ENABLED(CONFIG_AGP_INTEL)
 673 static int intel_fake_agp_fetch_size(void)
 674 {
 675         int num_sizes = ARRAY_SIZE(intel_fake_agp_sizes);
 676         unsigned int aper_size;
 677         int i;
 678
 679         aper_size = (intel_private.gtt_mappable_entries << PAGE_SHIFT) / MB(1);
 680
 681         for (i = 0; i < num_sizes; i++) {
 682                 if (aper_size == intel_fake_agp_sizes[i].size) {
 683                         agp_bridge->current_size =
 684                                 (void *) (intel_fake_agp_sizes + i);
 685                         return aper_size;
 686                 }
 687         }
 688
 689         return 0;
 690 }
 691 #endif
 692
 693 static void i830_cleanup(void)
 694 {
 695 }
 696
 697 /* The chipset_flush interface needs to get data that has already been
 698  * flushed out of the CPU all the way out to main memory, because the GPU
 699  * doesn't snoop those buffers.
 700  *
 701  * The 8xx series doesn't have the same lovely interface for flushing the
 702  * chipset write buffers that the later chips do. According to the 865
 703  * specs, it's 64 octwords, or 1KB.  So, to get those previous things in
 704  * that buffer out, we just fill 1KB and clflush it out, on the assumption
 705  * that it'll push whatever was in there out.  It appears to work.
 706  */
 707 static void i830_chipset_flush(void)
 708 {
 709         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 710
 711         /* Forcibly evict everything from the CPU write buffers.
 712          * clflush appears to be insufficient.
 713          */
 714         wbinvd_on_all_cpus();
 715
 716         /* Now we've only seen documents for this magic bit on 855GM,
 717          * we hope it exists for the other gen2 chipsets...
 718          *
 719          * Also works as advertised on my 845G.
 720          */
 721         writel(readl(intel_private.registers+I830_HIC) | (1<<31),
 722                intel_private.registers+I830_HIC);
 723
 724         while (readl(intel_private.registers+I830_HIC) & (1<<31)) {
 725                 if (time_after(jiffies, timeout))
 726                         break;
 727
 728                 udelay(50);
 729         }
 730 }
 731
 732 static void i830_write_entry(dma_addr_t addr, unsigned int entry,
 733                              unsigned int flags)
 734 {
 735         u32 pte_flags = I810_PTE_VALID;
 736
 737         if (flags ==  AGP_USER_CACHED_MEMORY)
 738                 pte_flags |= I830_PTE_SYSTEM_CACHED;
 739
 740         writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
 741 }
 742
 743 bool intel_enable_gtt(void)
 744 {
 745         u8 __iomem *reg;
 746
 747         if (INTEL_GTT_GEN == 2) {
 748                 u16 gmch_ctrl;
 749
 750                 pci_read_config_word(intel_private.bridge_dev,
 751                                      I830_GMCH_CTRL, &gmch_ctrl);
 752                 gmch_ctrl |= I830_GMCH_ENABLED;
 753                 pci_write_config_word(intel_private.bridge_dev,
 754                                       I830_GMCH_CTRL, gmch_ctrl);
 755
 756                 pci_read_config_word(intel_private.bridge_dev,
 757                                      I830_GMCH_CTRL, &gmch_ctrl);
 758                 if ((gmch_ctrl & I830_GMCH_ENABLED) == 0) {
 759                         dev_err(&intel_private.pcidev->dev,
 760                                 "failed to enable the GTT: GMCH_CTRL=%x\n",
 761                                 gmch_ctrl);
 762                         return false;
 763                 }
 764         }
 765
 766         /* On the resume path we may be adjusting the PGTBL value, so
 767          * be paranoid and flush all chipset write buffers...
 768          */
 769         if (INTEL_GTT_GEN >= 3)
 770                 writel(0, intel_private.registers+GFX_FLSH_CNTL);
 771
 772         reg = intel_private.registers+I810_PGETBL_CTL;
 773         writel(intel_private.PGETBL_save, reg);
 774         if (HAS_PGTBL_EN && (readl(reg) & I810_PGETBL_ENABLED) == 0) {
 775                 dev_err(&intel_private.pcidev->dev,
 776                         "failed to enable the GTT: PGETBL=%x [expected %x]\n",
 777                         readl(reg), intel_private.PGETBL_save);
 778                 return false;
 779         }
 780
 781         if (INTEL_GTT_GEN >= 3)
 782                 writel(0, intel_private.registers+GFX_FLSH_CNTL);
 783
 784         return true;
 785 }
 786 EXPORT_SYMBOL(intel_enable_gtt);
 787
 788 static int i830_setup(void)
 789 {
 790         phys_addr_t reg_addr;
 791
 792         reg_addr = pci_resource_start(intel_private.pcidev, I810_MMADR_BAR);
 793
 794         intel_private.registers = ioremap(reg_addr, KB(64));
 795         if (!intel_private.registers)
 796                 return -ENOMEM;
 797
 798         intel_private.gtt_phys_addr = reg_addr + I810_PTE_BASE;
 799
 800         return 0;
 801 }
 802
 803 #if IS_ENABLED(CONFIG_AGP_INTEL)
 804 static int intel_fake_agp_create_gatt_table(struct agp_bridge_data *bridge)
 805 {
 806         agp_bridge->gatt_table_real = NULL;
 807         agp_bridge->gatt_table = NULL;
 808         agp_bridge->gatt_bus_addr = 0;
 809
 810         return 0;
 811 }
 812
 813 static int intel_fake_agp_free_gatt_table(struct agp_bridge_data *bridge)
 814 {
 815         return 0;
 816 }
 817
 818 static int intel_fake_agp_configure(void)
 819 {
 820         if (!intel_enable_gtt())
 821             return -EIO;
 822
 823         intel_private.clear_fake_agp = true;
 824         agp_bridge->gart_bus_addr = intel_private.gma_bus_addr;
 825
 826         return 0;
 827 }
 828 #endif
 829
 830 static bool i830_check_flags(unsigned int flags)
 831 {
 832         switch (flags) {
 833         case 0:
 834         case AGP_PHYS_MEMORY:
 835         case AGP_USER_CACHED_MEMORY:
 836         case AGP_USER_MEMORY:
 837                 return true;
 838         }
 839
 840         return false;
 841 }
 842
 843 void intel_gtt_insert_page(dma_addr_t addr,
 844                            unsigned int pg,
 845                            unsigned int flags)
 846 {
 847         intel_private.driver->write_entry(addr, pg, flags);
 848 }
 849 EXPORT_SYMBOL(intel_gtt_insert_page);
 850
 851 void intel_gtt_insert_sg_entries(struct sg_table *st,
 852                                  unsigned int pg_start,
 853                                  unsigned int flags)
 854 {
 855         struct scatterlist *sg;
 856         unsigned int len, m;
 857         int i, j;
 858
 859         j = pg_start;
 860
 861         /* sg may merge pages, but we have to separate
 862          * per-page addr for GTT */
 863         for_each_sg(st->sgl, sg, st->nents, i) {
 864                 len = sg_dma_len(sg) >> PAGE_SHIFT;
 865                 for (m = 0; m < len; m++) {
 866                         dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
 867                         intel_private.driver->write_entry(addr, j, flags);
 868                         j++;
 869                 }
 870         }
 871         wmb();
 872 }
 873 EXPORT_SYMBOL(intel_gtt_insert_sg_entries);
 874
 875 #if IS_ENABLED(CONFIG_AGP_INTEL)
 876 static void intel_gtt_insert_pages(unsigned int first_entry,
 877                                    unsigned int num_entries,
 878                                    struct page **pages,
 879                                    unsigned int flags)
 880 {
 881         int i, j;
 882
 883         for (i = 0, j = first_entry; i < num_entries; i++, j++) {
 884                 dma_addr_t addr = page_to_phys(pages[i]);
 885                 intel_private.driver->write_entry(addr,
 886                                                   j, flags);
 887         }
 888         wmb();
 889 }
 890
 891 static int intel_fake_agp_insert_entries(struct agp_memory *mem,
 892                                          off_t pg_start, int type)
 893 {
 894         int ret = -EINVAL;
 895
 896         if (intel_private.clear_fake_agp) {
 897                 int start = intel_private.stolen_size / PAGE_SIZE;
 898                 int end = intel_private.gtt_mappable_entries;
 899                 intel_gtt_clear_range(start, end - start);
 900                 intel_private.clear_fake_agp = false;
 901         }
 902
 903         if (INTEL_GTT_GEN == 1 && type == AGP_DCACHE_MEMORY)
 904                 return i810_insert_dcache_entries(mem, pg_start, type);
 905
 906         if (mem->page_count == 0)
 907                 goto out;
 908
 909         if (pg_start + mem->page_count > intel_private.gtt_total_entries)
 910                 goto out_err;
 911
 912         if (type != mem->type)
 913                 goto out_err;
 914
 915         if (!intel_private.driver->check_flags(type))
 916                 goto out_err;
 917
 918         if (!mem->is_flushed)
 919                 global_cache_flush();
 920
 921         if (intel_private.needs_dmar) {
 922                 struct sg_table st;
 923
 924                 ret = intel_gtt_map_memory(mem->pages, mem->page_count, &st);
 925                 if (ret != 0)
 926                         return ret;
 927
 928                 intel_gtt_insert_sg_entries(&st, pg_start, type);
 929                 mem->sg_list = st.sgl;
 930                 mem->num_sg = st.nents;
 931         } else
 932                 intel_gtt_insert_pages(pg_start, mem->page_count, mem->pages,
 933                                        type);
 934
 935 out:
 936         ret = 0;
 937 out_err:
 938         mem->is_flushed = true;
 939         return ret;
 940 }
 941 #endif
 942
 943 void intel_gtt_clear_range(unsigned int first_entry, unsigned int num_entries)
 944 {
 945         unsigned int i;
 946
 947         for (i = first_entry; i < (first_entry + num_entries); i++) {
 948                 intel_private.driver->write_entry(intel_private.scratch_page_dma,
 949                                                   i, 0);
 950         }
 951         wmb();
 952 }
 953 EXPORT_SYMBOL(intel_gtt_clear_range);
 954
 955 #if IS_ENABLED(CONFIG_AGP_INTEL)
 956 static int intel_fake_agp_remove_entries(struct agp_memory *mem,
 957                                          off_t pg_start, int type)
 958 {
 959         if (mem->page_count == 0)
 960                 return 0;
 961
 962         intel_gtt_clear_range(pg_start, mem->page_count);
 963
 964         if (intel_private.needs_dmar) {
 965                 intel_gtt_unmap_memory(mem->sg_list, mem->num_sg);
 966                 mem->sg_list = NULL;
 967                 mem->num_sg = 0;
 968         }
 969
 970         return 0;
 971 }
 972
 973 static struct agp_memory *intel_fake_agp_alloc_by_type(size_t pg_count,
 974                                                        int type)
 975 {
 976         struct agp_memory *new;
 977
 978         if (type == AGP_DCACHE_MEMORY && INTEL_GTT_GEN == 1) {
 979                 if (pg_count != intel_private.num_dcache_entries)
 980                         return NULL;
 981
 982                 new = agp_create_memory(1);
 983                 if (new == NULL)
 984                         return NULL;
 985
 986                 new->type = AGP_DCACHE_MEMORY;
 987                 new->page_count = pg_count;
 988                 new->num_scratch_pages = 0;
 989                 agp_free_page_array(new);
 990                 return new;
 991         }
 992         if (type == AGP_PHYS_MEMORY)
 993                 return alloc_agpphysmem_i8xx(pg_count, type);
 994         /* always return NULL for other allocation types for now */
 995         return NULL;
 996 }
 997 #endif
 998
 999 static int intel_alloc_chipset_flush_resource(void)
1000 {
1001         int ret;
1002         ret = pci_bus_alloc_resource(intel_private.bridge_dev->bus, &intel_private.ifp_resource, PAGE_SIZE,
1003                                      PAGE_SIZE, PCIBIOS_MIN_MEM, 0,
1004                                      pcibios_align_resource, intel_private.bridge_dev);
1005
1006         return ret;
1007 }
1008
1009 static void intel_i915_setup_chipset_flush(void)
1010 {
1011         int ret;
1012         u32 temp;
1013
1014         pci_read_config_dword(intel_private.bridge_dev, I915_IFPADDR, &temp);
1015         if (!(temp & 0x1)) {
1016                 intel_alloc_chipset_flush_resource();
1017                 intel_private.resource_valid = 1;
1018                 pci_write_config_dword(intel_private.bridge_dev, I915_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1019         } else {
1020                 temp &= ~1;
1021
1022                 intel_private.resource_valid = 1;
1023                 intel_private.ifp_resource.start = temp;
1024                 intel_private.ifp_resource.end = temp + PAGE_SIZE;
1025                 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1026                 /* some BIOSes reserve this area in a pnp some don't */
1027                 if (ret)
1028                         intel_private.resource_valid = 0;
1029         }
1030 }
1031
1032 static void intel_i965_g33_setup_chipset_flush(void)
1033 {
1034         u32 temp_hi, temp_lo;
1035         int ret;
1036
1037         pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4, &temp_hi);
1038         pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR, &temp_lo);
1039
1040         if (!(temp_lo & 0x1)) {
1041
1042                 intel_alloc_chipset_flush_resource();
1043
1044                 intel_private.resource_valid = 1;
1045                 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4,
1046                         upper_32_bits(intel_private.ifp_resource.start));
1047                 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1048         } else {
1049                 u64 l64;
1050
1051                 temp_lo &= ~0x1;
1052                 l64 = ((u64)temp_hi << 32) | temp_lo;
1053
1054                 intel_private.resource_valid = 1;
1055                 intel_private.ifp_resource.start = l64;
1056                 intel_private.ifp_resource.end = l64 + PAGE_SIZE;
1057                 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1058                 /* some BIOSes reserve this area in a pnp some don't */
1059                 if (ret)
1060                         intel_private.resource_valid = 0;
1061         }
1062 }
1063
1064 static void intel_i9xx_setup_flush(void)
1065 {
1066         /* return if already configured */
1067         if (intel_private.ifp_resource.start)
1068                 return;
1069
1070         if (INTEL_GTT_GEN == 6)
1071                 return;
1072
1073         /* setup a resource for this object */
1074         intel_private.ifp_resource.name = "Intel Flush Page";
1075         intel_private.ifp_resource.flags = IORESOURCE_MEM;
1076
1077         /* Setup chipset flush for 915 */
1078         if (IS_G33 || INTEL_GTT_GEN >= 4) {
1079                 intel_i965_g33_setup_chipset_flush();
1080         } else {
1081                 intel_i915_setup_chipset_flush();
1082         }
1083
1084         if (intel_private.ifp_resource.start)
1085                 intel_private.i9xx_flush_page = ioremap_nocache(intel_private.ifp_resource.start, PAGE_SIZE);
1086         if (!intel_private.i9xx_flush_page)
1087                 dev_err(&intel_private.pcidev->dev,
1088                         "can't ioremap flush page - no chipset flushing\n");
1089 }
1090
1091 static void i9xx_cleanup(void)
1092 {
1093         if (intel_private.i9xx_flush_page)
1094                 iounmap(intel_private.i9xx_flush_page);
1095         if (intel_private.resource_valid)
1096                 release_resource(&intel_private.ifp_resource);
1097         intel_private.ifp_resource.start = 0;
1098         intel_private.resource_valid = 0;
1099 }
1100
1101 static void i9xx_chipset_flush(void)
1102 {
1103         if (intel_private.i9xx_flush_page)
1104                 writel(1, intel_private.i9xx_flush_page);
1105 }
1106
1107 static void i965_write_entry(dma_addr_t addr,
1108                              unsigned int entry,
1109                              unsigned int flags)
1110 {
1111         u32 pte_flags;
1112
1113         pte_flags = I810_PTE_VALID;
1114         if (flags == AGP_USER_CACHED_MEMORY)
1115                 pte_flags |= I830_PTE_SYSTEM_CACHED;
1116
1117         /* Shift high bits down */
1118         addr |= (addr >> 28) & 0xf0;
1119         writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
1120 }
1121
1122 static int i9xx_setup(void)
1123 {
1124         phys_addr_t reg_addr;
1125         int size = KB(512);
1126
1127         reg_addr = pci_resource_start(intel_private.pcidev, I915_MMADR_BAR);
1128
1129         intel_private.registers = ioremap(reg_addr, size);
1130         if (!intel_private.registers)
1131                 return -ENOMEM;
1132
1133         switch (INTEL_GTT_GEN) {
1134         case 3:
1135                 intel_private.gtt_phys_addr =
1136                         pci_resource_start(intel_private.pcidev, I915_PTE_BAR);
1137                 break;
1138         case 5:
1139                 intel_private.gtt_phys_addr = reg_addr + MB(2);
1140                 break;
1141         default:
1142                 intel_private.gtt_phys_addr = reg_addr + KB(512);
1143                 break;
1144         }
1145
1146         intel_i9xx_setup_flush();
1147
1148         return 0;
1149 }
1150
1151 #if IS_ENABLED(CONFIG_AGP_INTEL)
1152 static const struct agp_bridge_driver intel_fake_agp_driver = {
1153         .owner                  = THIS_MODULE,
1154         .size_type              = FIXED_APER_SIZE,
1155         .aperture_sizes         = intel_fake_agp_sizes,
1156         .num_aperture_sizes     = ARRAY_SIZE(intel_fake_agp_sizes),
1157         .configure              = intel_fake_agp_configure,
1158         .fetch_size             = intel_fake_agp_fetch_size,
1159         .cleanup                = intel_gtt_cleanup,
1160         .agp_enable             = intel_fake_agp_enable,
1161         .cache_flush            = global_cache_flush,
1162         .create_gatt_table      = intel_fake_agp_create_gatt_table,
1163         .free_gatt_table        = intel_fake_agp_free_gatt_table,
1164         .insert_memory          = intel_fake_agp_insert_entries,
1165         .remove_memory          = intel_fake_agp_remove_entries,
1166         .alloc_by_type          = intel_fake_agp_alloc_by_type,
1167         .free_by_type           = intel_i810_free_by_type,
1168         .agp_alloc_page         = agp_generic_alloc_page,
1169         .agp_alloc_pages        = agp_generic_alloc_pages,
1170         .agp_destroy_page       = agp_generic_destroy_page,
1171         .agp_destroy_pages      = agp_generic_destroy_pages,
1172 };
1173 #endif
1174
1175 static const struct intel_gtt_driver i81x_gtt_driver = {
1176         .gen = 1,
1177         .has_pgtbl_enable = 1,
1178         .dma_mask_size = 32,
1179         .setup = i810_setup,
1180         .cleanup = i810_cleanup,
1181         .check_flags = i830_check_flags,
1182         .write_entry = i810_write_entry,
1183 };
1184 static const struct intel_gtt_driver i8xx_gtt_driver = {
1185         .gen = 2,
1186         .has_pgtbl_enable = 1,
1187         .setup = i830_setup,
1188         .cleanup = i830_cleanup,
1189         .write_entry = i830_write_entry,
1190         .dma_mask_size = 32,
1191         .check_flags = i830_check_flags,
1192         .chipset_flush = i830_chipset_flush,
1193 };
1194 static const struct intel_gtt_driver i915_gtt_driver = {
1195         .gen = 3,
1196         .has_pgtbl_enable = 1,
1197         .setup = i9xx_setup,
1198         .cleanup = i9xx_cleanup,
1199         /* i945 is the last gpu to need phys mem (for overlay and cursors). */
1200         .write_entry = i830_write_entry,
1201         .dma_mask_size = 32,
1202         .check_flags = i830_check_flags,
1203         .chipset_flush = i9xx_chipset_flush,
1204 };
1205 static const struct intel_gtt_driver g33_gtt_driver = {
1206         .gen = 3,
1207         .is_g33 = 1,
1208         .setup = i9xx_setup,
1209         .cleanup = i9xx_cleanup,
1210         .write_entry = i965_write_entry,
1211         .dma_mask_size = 36,
1212         .check_flags = i830_check_flags,
1213         .chipset_flush = i9xx_chipset_flush,
1214 };
1215 static const struct intel_gtt_driver pineview_gtt_driver = {
1216         .gen = 3,
1217         .is_pineview = 1, .is_g33 = 1,
1218         .setup = i9xx_setup,
1219         .cleanup = i9xx_cleanup,
1220         .write_entry = i965_write_entry,
1221         .dma_mask_size = 36,
1222         .check_flags = i830_check_flags,
1223         .chipset_flush = i9xx_chipset_flush,
1224 };
1225 static const struct intel_gtt_driver i965_gtt_driver = {
1226         .gen = 4,
1227         .has_pgtbl_enable = 1,
1228         .setup = i9xx_setup,
1229         .cleanup = i9xx_cleanup,
1230         .write_entry = i965_write_entry,
1231         .dma_mask_size = 36,
1232         .check_flags = i830_check_flags,
1233         .chipset_flush = i9xx_chipset_flush,
1234 };
1235 static const struct intel_gtt_driver g4x_gtt_driver = {
1236         .gen = 5,
1237         .setup = i9xx_setup,
1238         .cleanup = i9xx_cleanup,
1239         .write_entry = i965_write_entry,
1240         .dma_mask_size = 36,
1241         .check_flags = i830_check_flags,
1242         .chipset_flush = i9xx_chipset_flush,
1243 };
1244 static const struct intel_gtt_driver ironlake_gtt_driver = {
1245         .gen = 5,
1246         .is_ironlake = 1,
1247         .setup = i9xx_setup,
1248         .cleanup = i9xx_cleanup,
1249         .write_entry = i965_write_entry,
1250         .dma_mask_size = 36,
1251         .check_flags = i830_check_flags,
1252         .chipset_flush = i9xx_chipset_flush,
1253 };
1254
1255 /* Table to describe Intel GMCH and AGP/PCIE GART drivers.  At least one of
1256  * driver and gmch_driver must be non-null, and find_gmch will determine
1257  * which one should be used if a gmch_chip_id is present.
1258  */
1259 static const struct intel_gtt_driver_description {
1260         unsigned int gmch_chip_id;
1261         char *name;
1262         const struct intel_gtt_driver *gtt_driver;
1263 } intel_gtt_chipsets[] = {
1264         { PCI_DEVICE_ID_INTEL_82810_IG1, "i810",
1265                 &i81x_gtt_driver},
1266         { PCI_DEVICE_ID_INTEL_82810_IG3, "i810",
1267                 &i81x_gtt_driver},
1268         { PCI_DEVICE_ID_INTEL_82810E_IG, "i810",
1269                 &i81x_gtt_driver},
1270         { PCI_DEVICE_ID_INTEL_82815_CGC, "i815",
1271                 &i81x_gtt_driver},
1272         { PCI_DEVICE_ID_INTEL_82830_CGC, "830M",
1273                 &i8xx_gtt_driver},
1274         { PCI_DEVICE_ID_INTEL_82845G_IG, "845G",
1275                 &i8xx_gtt_driver},
1276         { PCI_DEVICE_ID_INTEL_82854_IG, "854",
1277                 &i8xx_gtt_driver},
1278         { PCI_DEVICE_ID_INTEL_82855GM_IG, "855GM",
1279                 &i8xx_gtt_driver},
1280         { PCI_DEVICE_ID_INTEL_82865_IG, "865",
1281                 &i8xx_gtt_driver},
1282         { PCI_DEVICE_ID_INTEL_E7221_IG, "E7221 (i915)",
1283                 &i915_gtt_driver },
1284         { PCI_DEVICE_ID_INTEL_82915G_IG, "915G",
1285                 &i915_gtt_driver },
1286         { PCI_DEVICE_ID_INTEL_82915GM_IG, "915GM",
1287                 &i915_gtt_driver },
1288         { PCI_DEVICE_ID_INTEL_82945G_IG, "945G",
1289                 &i915_gtt_driver },
1290         { PCI_DEVICE_ID_INTEL_82945GM_IG, "945GM",
1291                 &i915_gtt_driver },
1292         { PCI_DEVICE_ID_INTEL_82945GME_IG, "945GME",
1293                 &i915_gtt_driver },
1294         { PCI_DEVICE_ID_INTEL_82946GZ_IG, "946GZ",
1295                 &i965_gtt_driver },
1296         { PCI_DEVICE_ID_INTEL_82G35_IG, "G35",
1297                 &i965_gtt_driver },
1298         { PCI_DEVICE_ID_INTEL_82965Q_IG, "965Q",
1299                 &i965_gtt_driver },
1300         { PCI_DEVICE_ID_INTEL_82965G_IG, "965G",
1301                 &i965_gtt_driver },
1302         { PCI_DEVICE_ID_INTEL_82965GM_IG, "965GM",
1303                 &i965_gtt_driver },
1304         { PCI_DEVICE_ID_INTEL_82965GME_IG, "965GME/GLE",
1305                 &i965_gtt_driver },
1306         { PCI_DEVICE_ID_INTEL_G33_IG, "G33",
1307                 &g33_gtt_driver },
1308         { PCI_DEVICE_ID_INTEL_Q35_IG, "Q35",
1309                 &g33_gtt_driver },
1310         { PCI_DEVICE_ID_INTEL_Q33_IG, "Q33",
1311                 &g33_gtt_driver },
1312         { PCI_DEVICE_ID_INTEL_PINEVIEW_M_IG, "GMA3150",
1313                 &pineview_gtt_driver },
1314         { PCI_DEVICE_ID_INTEL_PINEVIEW_IG, "GMA3150",
1315                 &pineview_gtt_driver },
1316         { PCI_DEVICE_ID_INTEL_GM45_IG, "GM45",
1317                 &g4x_gtt_driver },
1318         { PCI_DEVICE_ID_INTEL_EAGLELAKE_IG, "Eaglelake",
1319                 &g4x_gtt_driver },
1320         { PCI_DEVICE_ID_INTEL_Q45_IG, "Q45/Q43",
1321                 &g4x_gtt_driver },
1322         { PCI_DEVICE_ID_INTEL_G45_IG, "G45/G43",
1323                 &g4x_gtt_driver },
1324         { PCI_DEVICE_ID_INTEL_B43_IG, "B43",
1325                 &g4x_gtt_driver },
1326         { PCI_DEVICE_ID_INTEL_B43_1_IG, "B43",
1327                 &g4x_gtt_driver },
1328         { PCI_DEVICE_ID_INTEL_G41_IG, "G41",
1329                 &g4x_gtt_driver },
1330         { PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG,
1331             "HD Graphics", &ironlake_gtt_driver },
1332         { PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG,
1333             "HD Graphics", &ironlake_gtt_driver },
1334         { 0, NULL, NULL }
1335 };
1336
1337 static int find_gmch(u16 device)
1338 {
1339         struct pci_dev *gmch_device;
1340
1341         gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL, device, NULL);
1342         if (gmch_device && PCI_FUNC(gmch_device->devfn) != 0) {
1343                 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL,
1344                                              device, gmch_device);
1345         }
1346
1347         if (!gmch_device)
1348                 return 0;
1349
1350         intel_private.pcidev = gmch_device;
1351         return 1;
1352 }
1353
1354 int intel_gmch_probe(struct pci_dev *bridge_pdev, struct pci_dev *gpu_pdev,
1355                      struct agp_bridge_data *bridge)
1356 {
1357         int i, mask;
1358
1359         for (i = 0; intel_gtt_chipsets[i].name != NULL; i++) {
1360                 if (gpu_pdev) {
1361                         if (gpu_pdev->device ==
1362                             intel_gtt_chipsets[i].gmch_chip_id) {
1363                                 intel_private.pcidev = pci_dev_get(gpu_pdev);
1364                                 intel_private.driver =
1365                                         intel_gtt_chipsets[i].gtt_driver;
1366
1367                                 break;
1368                         }
1369                 } else if (find_gmch(intel_gtt_chipsets[i].gmch_chip_id)) {
1370                         intel_private.driver =
1371                                 intel_gtt_chipsets[i].gtt_driver;
1372                         break;
1373                 }
1374         }
1375
1376         if (!intel_private.driver)
1377                 return 0;
1378
1379 #if IS_ENABLED(CONFIG_AGP_INTEL)
1380         if (bridge) {
1381                 if (INTEL_GTT_GEN > 1)
1382                         return 0;
1383
1384                 bridge->driver = &intel_fake_agp_driver;
1385                 bridge->dev_private_data = &intel_private;
1386                 bridge->dev = bridge_pdev;
1387         }
1388 #endif
1389
1390
1391         /*
1392          * Can be called from the fake agp driver but also directly from
1393          * drm/i915.ko. Hence we need to check whether everything is set up
1394          * already.
1395          */
1396         if (intel_private.refcount++)
1397                 return 1;
1398
1399         intel_private.bridge_dev = pci_dev_get(bridge_pdev);
1400
1401         dev_info(&bridge_pdev->dev, "Intel %s Chipset\n", intel_gtt_chipsets[i].name);
1402
1403         mask = intel_private.driver->dma_mask_size;
1404         if (pci_set_dma_mask(intel_private.pcidev, DMA_BIT_MASK(mask)))
1405                 dev_err(&intel_private.pcidev->dev,
1406                         "set gfx device dma mask %d-bit failed!\n", mask);
1407         else
1408                 pci_set_consistent_dma_mask(intel_private.pcidev,
1409                                             DMA_BIT_MASK(mask));
1410
1411         if (intel_gtt_init() != 0) {
1412                 intel_gmch_remove();
1413
1414                 return 0;
1415         }
1416
1417         return 1;
1418 }
1419 EXPORT_SYMBOL(intel_gmch_probe);
1420
1421 void intel_gtt_get(u64 *gtt_total, size_t *stolen_size,
1422                    phys_addr_t *mappable_base, u64 *mappable_end)
1423 {
1424         *gtt_total = intel_private.gtt_total_entries << PAGE_SHIFT;
1425         *stolen_size = intel_private.stolen_size;
1426         *mappable_base = intel_private.gma_bus_addr;
1427         *mappable_end = intel_private.gtt_mappable_entries << PAGE_SHIFT;
1428 }
1429 EXPORT_SYMBOL(intel_gtt_get);
1430
1431 void intel_gtt_chipset_flush(void)
1432 {
1433         if (intel_private.driver->chipset_flush)
1434                 intel_private.driver->chipset_flush();
1435 }
1436 EXPORT_SYMBOL(intel_gtt_chipset_flush);
1437
1438 void intel_gmch_remove(void)
1439 {
1440         if (--intel_private.refcount)
1441                 return;
1442
1443         if (intel_private.scratch_page)
1444                 intel_gtt_teardown_scratch_page();
1445         if (intel_private.pcidev)
1446                 pci_dev_put(intel_private.pcidev);
1447         if (intel_private.bridge_dev)
1448                 pci_dev_put(intel_private.bridge_dev);
1449         intel_private.driver = NULL;
1450 }
1451 EXPORT_SYMBOL(intel_gmch_remove);
1452
1453 MODULE_AUTHOR("Dave Jones, Various @Intel");
1454 MODULE_LICENSE("GPL and additional rights");