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/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/pagemap.h>
  23 #include <linux/agp_backend.h>
  24 #include <linux/delay.h>
  25 #include <asm/smp.h>
  26 #include "agp.h"
  27 #include "intel-agp.h"
  28 #include <drm/intel-gtt.h>
  29
  30 /*
  31  * If we have Intel graphics, we're not going to have anything other than
  32  * an Intel IOMMU. So make the correct use of the PCI DMA API contingent
  33  * on the Intel IOMMU support (CONFIG_INTEL_IOMMU).
  34  * Only newer chipsets need to bother with this, of course.
  35  */
  36 #ifdef CONFIG_INTEL_IOMMU
  37 #define USE_PCI_DMA_API 1
  38 #else
  39 #define USE_PCI_DMA_API 0
  40 #endif
  41
  42 struct intel_gtt_driver {
  43         unsigned int gen : 8;
  44         unsigned int is_g33 : 1;
  45         unsigned int is_pineview : 1;
  46         unsigned int is_ironlake : 1;
  47         unsigned int has_pgtbl_enable : 1;
  48         unsigned int dma_mask_size : 8;
  49         /* Chipset specific GTT setup */
  50         int (*setup)(void);
  51         /* This should undo anything done in ->setup() save the unmapping
  52          * of the mmio register file, that's done in the generic code. */
  53         void (*cleanup)(void);
  54         void (*write_entry)(dma_addr_t addr, unsigned int entry, unsigned int flags);
  55         /* Flags is a more or less chipset specific opaque value.
  56          * For chipsets that need to support old ums (non-gem) code, this
  57          * needs to be identical to the various supported agp memory types! */
  58         bool (*check_flags)(unsigned int flags);
  59         void (*chipset_flush)(void);
  60 };
  61
  62 static struct _intel_private {
  63         struct intel_gtt base;
  64         const struct intel_gtt_driver *driver;
  65         struct pci_dev *pcidev; /* device one */
  66         struct pci_dev *bridge_dev;
  67         u8 __iomem *registers;
  68         phys_addr_t gtt_bus_addr;
  69         phys_addr_t gma_bus_addr;
  70         u32 PGETBL_save;
  71         u32 __iomem *gtt;               /* I915G */
  72         bool clear_fake_agp; /* on first access via agp, fill with scratch */
  73         int num_dcache_entries;
  74         void __iomem *i9xx_flush_page;
  75         char *i81x_gtt_table;
  76         struct resource ifp_resource;
  77         int resource_valid;
  78         struct page *scratch_page;
  79 } intel_private;
  80
  81 #define INTEL_GTT_GEN   intel_private.driver->gen
  82 #define IS_G33          intel_private.driver->is_g33
  83 #define IS_PINEVIEW     intel_private.driver->is_pineview
  84 #define IS_IRONLAKE     intel_private.driver->is_ironlake
  85 #define HAS_PGTBL_EN    intel_private.driver->has_pgtbl_enable
  86
  87 int intel_gtt_map_memory(struct page **pages, unsigned int num_entries,
  88                          struct scatterlist **sg_list, int *num_sg)
  89 {
  90         struct sg_table st;
  91         struct scatterlist *sg;
  92         int i;
  93
  94         if (*sg_list)
  95                 return 0; /* already mapped (for e.g. resume */
  96
  97         DBG("try mapping %lu pages\n", (unsigned long)num_entries);
  98
  99         if (sg_alloc_table(&st, num_entries, GFP_KERNEL))
 100                 goto err;
 101
 102         *sg_list = sg = st.sgl;
 103
 104         for (i = 0 ; i < num_entries; i++, sg = sg_next(sg))
 105                 sg_set_page(sg, pages[i], PAGE_SIZE, 0);
 106
 107         *num_sg = pci_map_sg(intel_private.pcidev, *sg_list,
 108                                  num_entries, PCI_DMA_BIDIRECTIONAL);
 109         if (unlikely(!*num_sg))
 110                 goto err;
 111
 112         return 0;
 113
 114 err:
 115         sg_free_table(&st);
 116         return -ENOMEM;
 117 }
 118 EXPORT_SYMBOL(intel_gtt_map_memory);
 119
 120 void intel_gtt_unmap_memory(struct scatterlist *sg_list, int num_sg)
 121 {
 122         struct sg_table st;
 123         DBG("try unmapping %lu pages\n", (unsigned long)mem->page_count);
 124
 125         pci_unmap_sg(intel_private.pcidev, sg_list,
 126                      num_sg, PCI_DMA_BIDIRECTIONAL);
 127
 128         st.sgl = sg_list;
 129         st.orig_nents = st.nents = num_sg;
 130
 131         sg_free_table(&st);
 132 }
 133 EXPORT_SYMBOL(intel_gtt_unmap_memory);
 134
 135 static void intel_fake_agp_enable(struct agp_bridge_data *bridge, u32 mode)
 136 {
 137         return;
 138 }
 139
 140 /* Exists to support ARGB cursors */
 141 static struct page *i8xx_alloc_pages(void)
 142 {
 143         struct page *page;
 144
 145         page = alloc_pages(GFP_KERNEL | GFP_DMA32, 2);
 146         if (page == NULL)
 147                 return NULL;
 148
 149         if (set_pages_uc(page, 4) < 0) {
 150                 set_pages_wb(page, 4);
 151                 __free_pages(page, 2);
 152                 return NULL;
 153         }
 154         get_page(page);
 155         atomic_inc(&agp_bridge->current_memory_agp);
 156         return page;
 157 }
 158
 159 static void i8xx_destroy_pages(struct page *page)
 160 {
 161         if (page == NULL)
 162                 return;
 163
 164         set_pages_wb(page, 4);
 165         put_page(page);
 166         __free_pages(page, 2);
 167         atomic_dec(&agp_bridge->current_memory_agp);
 168 }
 169
 170 #define I810_GTT_ORDER 4
 171 static int i810_setup(void)
 172 {
 173         u32 reg_addr;
 174         char *gtt_table;
 175
 176         /* i81x does not preallocate the gtt. It's always 64kb in size. */
 177         gtt_table = alloc_gatt_pages(I810_GTT_ORDER);
 178         if (gtt_table == NULL)
 179                 return -ENOMEM;
 180         intel_private.i81x_gtt_table = gtt_table;
 181
 182         pci_read_config_dword(intel_private.pcidev, I810_MMADDR, &reg_addr);
 183         reg_addr &= 0xfff80000;
 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_bus_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 static int i810_insert_dcache_entries(struct agp_memory *mem, off_t pg_start,
 211                                       int type)
 212 {
 213         int i;
 214
 215         if ((pg_start + mem->page_count)
 216                         > intel_private.num_dcache_entries)
 217                 return -EINVAL;
 218
 219         if (!mem->is_flushed)
 220                 global_cache_flush();
 221
 222         for (i = pg_start; i < (pg_start + mem->page_count); i++) {
 223                 dma_addr_t addr = i << PAGE_SHIFT;
 224                 intel_private.driver->write_entry(addr,
 225                                                   i, type);
 226         }
 227         readl(intel_private.gtt+i-1);
 228
 229         return 0;
 230 }
 231
 232 /*
 233  * The i810/i830 requires a physical address to program its mouse
 234  * pointer into hardware.
 235  * However the Xserver still writes to it through the agp aperture.
 236  */
 237 static struct agp_memory *alloc_agpphysmem_i8xx(size_t pg_count, int type)
 238 {
 239         struct agp_memory *new;
 240         struct page *page;
 241
 242         switch (pg_count) {
 243         case 1: page = agp_bridge->driver->agp_alloc_page(agp_bridge);
 244                 break;
 245         case 4:
 246                 /* kludge to get 4 physical pages for ARGB cursor */
 247                 page = i8xx_alloc_pages();
 248                 break;
 249         default:
 250                 return NULL;
 251         }
 252
 253         if (page == NULL)
 254                 return NULL;
 255
 256         new = agp_create_memory(pg_count);
 257         if (new == NULL)
 258                 return NULL;
 259
 260         new->pages[0] = page;
 261         if (pg_count == 4) {
 262                 /* kludge to get 4 physical pages for ARGB cursor */
 263                 new->pages[1] = new->pages[0] + 1;
 264                 new->pages[2] = new->pages[1] + 1;
 265                 new->pages[3] = new->pages[2] + 1;
 266         }
 267         new->page_count = pg_count;
 268         new->num_scratch_pages = pg_count;
 269         new->type = AGP_PHYS_MEMORY;
 270         new->physical = page_to_phys(new->pages[0]);
 271         return new;
 272 }
 273
 274 static void intel_i810_free_by_type(struct agp_memory *curr)
 275 {
 276         agp_free_key(curr->key);
 277         if (curr->type == AGP_PHYS_MEMORY) {
 278                 if (curr->page_count == 4)
 279                         i8xx_destroy_pages(curr->pages[0]);
 280                 else {
 281                         agp_bridge->driver->agp_destroy_page(curr->pages[0],
 282                                                              AGP_PAGE_DESTROY_UNMAP);
 283                         agp_bridge->driver->agp_destroy_page(curr->pages[0],
 284                                                              AGP_PAGE_DESTROY_FREE);
 285                 }
 286                 agp_free_page_array(curr);
 287         }
 288         kfree(curr);
 289 }
 290
 291 static int intel_gtt_setup_scratch_page(void)
 292 {
 293         struct page *page;
 294         dma_addr_t dma_addr;
 295
 296         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
 297         if (page == NULL)
 298                 return -ENOMEM;
 299         get_page(page);
 300         set_pages_uc(page, 1);
 301
 302         if (intel_private.base.needs_dmar) {
 303                 dma_addr = pci_map_page(intel_private.pcidev, page, 0,
 304                                     PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 305                 if (pci_dma_mapping_error(intel_private.pcidev, dma_addr))
 306                         return -EINVAL;
 307
 308                 intel_private.base.scratch_page_dma = dma_addr;
 309         } else
 310                 intel_private.base.scratch_page_dma = page_to_phys(page);
 311
 312         intel_private.scratch_page = page;
 313
 314         return 0;
 315 }
 316
 317 static void i810_write_entry(dma_addr_t addr, unsigned int entry,
 318                              unsigned int flags)
 319 {
 320         u32 pte_flags = I810_PTE_VALID;
 321
 322         switch (flags) {
 323         case AGP_DCACHE_MEMORY:
 324                 pte_flags |= I810_PTE_LOCAL;
 325                 break;
 326         case AGP_USER_CACHED_MEMORY:
 327                 pte_flags |= I830_PTE_SYSTEM_CACHED;
 328                 break;
 329         }
 330
 331         writel(addr | pte_flags, intel_private.gtt + entry);
 332 }
 333
 334 static const struct aper_size_info_fixed intel_fake_agp_sizes[] = {
 335         {32, 8192, 3},
 336         {64, 16384, 4},
 337         {128, 32768, 5},
 338         {256, 65536, 6},
 339         {512, 131072, 7},
 340 };
 341
 342 static unsigned int intel_gtt_stolen_size(void)
 343 {
 344         u16 gmch_ctrl;
 345         u8 rdct;
 346         int local = 0;
 347         static const int ddt[4] = { 0, 16, 32, 64 };
 348         unsigned int stolen_size = 0;
 349
 350         if (INTEL_GTT_GEN == 1)
 351                 return 0; /* no stolen mem on i81x */
 352
 353         pci_read_config_word(intel_private.bridge_dev,
 354                              I830_GMCH_CTRL, &gmch_ctrl);
 355
 356         if (intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82830_HB ||
 357             intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82845G_HB) {
 358                 switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
 359                 case I830_GMCH_GMS_STOLEN_512:
 360                         stolen_size = KB(512);
 361                         break;
 362                 case I830_GMCH_GMS_STOLEN_1024:
 363                         stolen_size = MB(1);
 364                         break;
 365                 case I830_GMCH_GMS_STOLEN_8192:
 366                         stolen_size = MB(8);
 367                         break;
 368                 case I830_GMCH_GMS_LOCAL:
 369                         rdct = readb(intel_private.registers+I830_RDRAM_CHANNEL_TYPE);
 370                         stolen_size = (I830_RDRAM_ND(rdct) + 1) *
 371                                         MB(ddt[I830_RDRAM_DDT(rdct)]);
 372                         local = 1;
 373                         break;
 374                 default:
 375                         stolen_size = 0;
 376                         break;
 377                 }
 378         } else if (INTEL_GTT_GEN == 6) {
 379                 /*
 380                  * SandyBridge has new memory control reg at 0x50.w
 381                  */
 382                 u16 snb_gmch_ctl;
 383                 pci_read_config_word(intel_private.pcidev, SNB_GMCH_CTRL, &snb_gmch_ctl);
 384                 switch (snb_gmch_ctl & SNB_GMCH_GMS_STOLEN_MASK) {
 385                 case SNB_GMCH_GMS_STOLEN_32M:
 386                         stolen_size = MB(32);
 387                         break;
 388                 case SNB_GMCH_GMS_STOLEN_64M:
 389                         stolen_size = MB(64);
 390                         break;
 391                 case SNB_GMCH_GMS_STOLEN_96M:
 392                         stolen_size = MB(96);
 393                         break;
 394                 case SNB_GMCH_GMS_STOLEN_128M:
 395                         stolen_size = MB(128);
 396                         break;
 397                 case SNB_GMCH_GMS_STOLEN_160M:
 398                         stolen_size = MB(160);
 399                         break;
 400                 case SNB_GMCH_GMS_STOLEN_192M:
 401                         stolen_size = MB(192);
 402                         break;
 403                 case SNB_GMCH_GMS_STOLEN_224M:
 404                         stolen_size = MB(224);
 405                         break;
 406                 case SNB_GMCH_GMS_STOLEN_256M:
 407                         stolen_size = MB(256);
 408                         break;
 409                 case SNB_GMCH_GMS_STOLEN_288M:
 410                         stolen_size = MB(288);
 411                         break;
 412                 case SNB_GMCH_GMS_STOLEN_320M:
 413                         stolen_size = MB(320);
 414                         break;
 415                 case SNB_GMCH_GMS_STOLEN_352M:
 416                         stolen_size = MB(352);
 417                         break;
 418                 case SNB_GMCH_GMS_STOLEN_384M:
 419                         stolen_size = MB(384);
 420                         break;
 421                 case SNB_GMCH_GMS_STOLEN_416M:
 422                         stolen_size = MB(416);
 423                         break;
 424                 case SNB_GMCH_GMS_STOLEN_448M:
 425                         stolen_size = MB(448);
 426                         break;
 427                 case SNB_GMCH_GMS_STOLEN_480M:
 428                         stolen_size = MB(480);
 429                         break;
 430                 case SNB_GMCH_GMS_STOLEN_512M:
 431                         stolen_size = MB(512);
 432                         break;
 433                 }
 434         } else {
 435                 switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
 436                 case I855_GMCH_GMS_STOLEN_1M:
 437                         stolen_size = MB(1);
 438                         break;
 439                 case I855_GMCH_GMS_STOLEN_4M:
 440                         stolen_size = MB(4);
 441                         break;
 442                 case I855_GMCH_GMS_STOLEN_8M:
 443                         stolen_size = MB(8);
 444                         break;
 445                 case I855_GMCH_GMS_STOLEN_16M:
 446                         stolen_size = MB(16);
 447                         break;
 448                 case I855_GMCH_GMS_STOLEN_32M:
 449                         stolen_size = MB(32);
 450                         break;
 451                 case I915_GMCH_GMS_STOLEN_48M:
 452                         stolen_size = MB(48);
 453                         break;
 454                 case I915_GMCH_GMS_STOLEN_64M:
 455                         stolen_size = MB(64);
 456                         break;
 457                 case G33_GMCH_GMS_STOLEN_128M:
 458                         stolen_size = MB(128);
 459                         break;
 460                 case G33_GMCH_GMS_STOLEN_256M:
 461                         stolen_size = MB(256);
 462                         break;
 463                 case INTEL_GMCH_GMS_STOLEN_96M:
 464                         stolen_size = MB(96);
 465                         break;
 466                 case INTEL_GMCH_GMS_STOLEN_160M:
 467                         stolen_size = MB(160);
 468                         break;
 469                 case INTEL_GMCH_GMS_STOLEN_224M:
 470                         stolen_size = MB(224);
 471                         break;
 472                 case INTEL_GMCH_GMS_STOLEN_352M:
 473                         stolen_size = MB(352);
 474                         break;
 475                 default:
 476                         stolen_size = 0;
 477                         break;
 478                 }
 479         }
 480
 481         if (stolen_size > 0) {
 482                 dev_info(&intel_private.bridge_dev->dev, "detected %dK %s memory\n",
 483                        stolen_size / KB(1), local ? "local" : "stolen");
 484         } else {
 485                 dev_info(&intel_private.bridge_dev->dev,
 486                        "no pre-allocated video memory detected\n");
 487                 stolen_size = 0;
 488         }
 489
 490         return stolen_size;
 491 }
 492
 493 static void i965_adjust_pgetbl_size(unsigned int size_flag)
 494 {
 495         u32 pgetbl_ctl, pgetbl_ctl2;
 496
 497         /* ensure that ppgtt is disabled */
 498         pgetbl_ctl2 = readl(intel_private.registers+I965_PGETBL_CTL2);
 499         pgetbl_ctl2 &= ~I810_PGETBL_ENABLED;
 500         writel(pgetbl_ctl2, intel_private.registers+I965_PGETBL_CTL2);
 501
 502         /* write the new ggtt size */
 503         pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
 504         pgetbl_ctl &= ~I965_PGETBL_SIZE_MASK;
 505         pgetbl_ctl |= size_flag;
 506         writel(pgetbl_ctl, intel_private.registers+I810_PGETBL_CTL);
 507 }
 508
 509 static unsigned int i965_gtt_total_entries(void)
 510 {
 511         int size;
 512         u32 pgetbl_ctl;
 513         u16 gmch_ctl;
 514
 515         pci_read_config_word(intel_private.bridge_dev,
 516                              I830_GMCH_CTRL, &gmch_ctl);
 517
 518         if (INTEL_GTT_GEN == 5) {
 519                 switch (gmch_ctl & G4x_GMCH_SIZE_MASK) {
 520                 case G4x_GMCH_SIZE_1M:
 521                 case G4x_GMCH_SIZE_VT_1M:
 522                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1MB);
 523                         break;
 524                 case G4x_GMCH_SIZE_VT_1_5M:
 525                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1_5MB);
 526                         break;
 527                 case G4x_GMCH_SIZE_2M:
 528                 case G4x_GMCH_SIZE_VT_2M:
 529                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_2MB);
 530                         break;
 531                 }
 532         }
 533
 534         pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
 535
 536         switch (pgetbl_ctl & I965_PGETBL_SIZE_MASK) {
 537         case I965_PGETBL_SIZE_128KB:
 538                 size = KB(128);
 539                 break;
 540         case I965_PGETBL_SIZE_256KB:
 541                 size = KB(256);
 542                 break;
 543         case I965_PGETBL_SIZE_512KB:
 544                 size = KB(512);
 545                 break;
 546         /* GTT pagetable sizes bigger than 512KB are not possible on G33! */
 547         case I965_PGETBL_SIZE_1MB:
 548                 size = KB(1024);
 549                 break;
 550         case I965_PGETBL_SIZE_2MB:
 551                 size = KB(2048);
 552                 break;
 553         case I965_PGETBL_SIZE_1_5MB:
 554                 size = KB(1024 + 512);
 555                 break;
 556         default:
 557                 dev_info(&intel_private.pcidev->dev,
 558                          "unknown page table size, assuming 512KB\n");
 559                 size = KB(512);
 560         }
 561
 562         return size/4;
 563 }
 564
 565 static unsigned int intel_gtt_total_entries(void)
 566 {
 567         int size;
 568
 569         if (IS_G33 || INTEL_GTT_GEN == 4 || INTEL_GTT_GEN == 5)
 570                 return i965_gtt_total_entries();
 571         else if (INTEL_GTT_GEN == 6) {
 572                 u16 snb_gmch_ctl;
 573
 574                 pci_read_config_word(intel_private.pcidev, SNB_GMCH_CTRL, &snb_gmch_ctl);
 575                 switch (snb_gmch_ctl & SNB_GTT_SIZE_MASK) {
 576                 default:
 577                 case SNB_GTT_SIZE_0M:
 578                         printk(KERN_ERR "Bad GTT size mask: 0x%04x.\n", snb_gmch_ctl);
 579                         size = MB(0);
 580                         break;
 581                 case SNB_GTT_SIZE_1M:
 582                         size = MB(1);
 583                         break;
 584                 case SNB_GTT_SIZE_2M:
 585                         size = MB(2);
 586                         break;
 587                 }
 588                 return size/4;
 589         } else {
 590                 /* On previous hardware, the GTT size was just what was
 591                  * required to map the aperture.
 592                  */
 593                 return intel_private.base.gtt_mappable_entries;
 594         }
 595 }
 596
 597 static unsigned int intel_gtt_mappable_entries(void)
 598 {
 599         unsigned int aperture_size;
 600
 601         if (INTEL_GTT_GEN == 1) {
 602                 u32 smram_miscc;
 603
 604                 pci_read_config_dword(intel_private.bridge_dev,
 605                                       I810_SMRAM_MISCC, &smram_miscc);
 606
 607                 if ((smram_miscc & I810_GFX_MEM_WIN_SIZE)
 608                                 == I810_GFX_MEM_WIN_32M)
 609                         aperture_size = MB(32);
 610                 else
 611                         aperture_size = MB(64);
 612         } else if (INTEL_GTT_GEN == 2) {
 613                 u16 gmch_ctrl;
 614
 615                 pci_read_config_word(intel_private.bridge_dev,
 616                                      I830_GMCH_CTRL, &gmch_ctrl);
 617
 618                 if ((gmch_ctrl & I830_GMCH_MEM_MASK) == I830_GMCH_MEM_64M)
 619                         aperture_size = MB(64);
 620                 else
 621                         aperture_size = MB(128);
 622         } else {
 623                 /* 9xx supports large sizes, just look at the length */
 624                 aperture_size = pci_resource_len(intel_private.pcidev, 2);
 625         }
 626
 627         return aperture_size >> PAGE_SHIFT;
 628 }
 629
 630 static void intel_gtt_teardown_scratch_page(void)
 631 {
 632         set_pages_wb(intel_private.scratch_page, 1);
 633         pci_unmap_page(intel_private.pcidev, intel_private.base.scratch_page_dma,
 634                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 635         put_page(intel_private.scratch_page);
 636         __free_page(intel_private.scratch_page);
 637 }
 638
 639 static void intel_gtt_cleanup(void)
 640 {
 641         intel_private.driver->cleanup();
 642
 643         iounmap(intel_private.gtt);
 644         iounmap(intel_private.registers);
 645
 646         intel_gtt_teardown_scratch_page();
 647 }
 648
 649 static int intel_gtt_init(void)
 650 {
 651         u32 gtt_map_size;
 652         int ret;
 653
 654         ret = intel_private.driver->setup();
 655         if (ret != 0)
 656                 return ret;
 657
 658         intel_private.base.gtt_mappable_entries = intel_gtt_mappable_entries();
 659         intel_private.base.gtt_total_entries = intel_gtt_total_entries();
 660
 661         /* save the PGETBL reg for resume */
 662         intel_private.PGETBL_save =
 663                 readl(intel_private.registers+I810_PGETBL_CTL)
 664                         & ~I810_PGETBL_ENABLED;
 665         /* we only ever restore the register when enabling the PGTBL... */
 666         if (HAS_PGTBL_EN)
 667                 intel_private.PGETBL_save |= I810_PGETBL_ENABLED;
 668
 669         dev_info(&intel_private.bridge_dev->dev,
 670                         "detected gtt size: %dK total, %dK mappable\n",
 671                         intel_private.base.gtt_total_entries * 4,
 672                         intel_private.base.gtt_mappable_entries * 4);
 673
 674         gtt_map_size = intel_private.base.gtt_total_entries * 4;
 675
 676         intel_private.gtt = ioremap(intel_private.gtt_bus_addr,
 677                                     gtt_map_size);
 678         if (!intel_private.gtt) {
 679                 intel_private.driver->cleanup();
 680                 iounmap(intel_private.registers);
 681                 return -ENOMEM;
 682         }
 683         intel_private.base.gtt = intel_private.gtt;
 684
 685         global_cache_flush();   /* FIXME: ? */
 686
 687         intel_private.base.stolen_size = intel_gtt_stolen_size();
 688
 689         intel_private.base.needs_dmar = USE_PCI_DMA_API && INTEL_GTT_GEN > 2;
 690
 691         ret = intel_gtt_setup_scratch_page();
 692         if (ret != 0) {
 693                 intel_gtt_cleanup();
 694                 return ret;
 695         }
 696
 697         return 0;
 698 }
 699
 700 static int intel_fake_agp_fetch_size(void)
 701 {
 702         int num_sizes = ARRAY_SIZE(intel_fake_agp_sizes);
 703         unsigned int aper_size;
 704         int i;
 705
 706         aper_size = (intel_private.base.gtt_mappable_entries << PAGE_SHIFT)
 707                     / MB(1);
 708
 709         for (i = 0; i < num_sizes; i++) {
 710                 if (aper_size == intel_fake_agp_sizes[i].size) {
 711                         agp_bridge->current_size =
 712                                 (void *) (intel_fake_agp_sizes + i);
 713                         return aper_size;
 714                 }
 715         }
 716
 717         return 0;
 718 }
 719
 720 static void i830_cleanup(void)
 721 {
 722 }
 723
 724 /* The chipset_flush interface needs to get data that has already been
 725  * flushed out of the CPU all the way out to main memory, because the GPU
 726  * doesn't snoop those buffers.
 727  *
 728  * The 8xx series doesn't have the same lovely interface for flushing the
 729  * chipset write buffers that the later chips do. According to the 865
 730  * specs, it's 64 octwords, or 1KB.  So, to get those previous things in
 731  * that buffer out, we just fill 1KB and clflush it out, on the assumption
 732  * that it'll push whatever was in there out.  It appears to work.
 733  */
 734 static void i830_chipset_flush(void)
 735 {
 736         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 737
 738         /* Forcibly evict everything from the CPU write buffers.
 739          * clflush appears to be insufficient.
 740          */
 741         wbinvd_on_all_cpus();
 742
 743         /* Now we've only seen documents for this magic bit on 855GM,
 744          * we hope it exists for the other gen2 chipsets...
 745          *
 746          * Also works as advertised on my 845G.
 747          */
 748         writel(readl(intel_private.registers+I830_HIC) | (1<<31),
 749                intel_private.registers+I830_HIC);
 750
 751         while (readl(intel_private.registers+I830_HIC) & (1<<31)) {
 752                 if (time_after(jiffies, timeout))
 753                         break;
 754
 755                 udelay(50);
 756         }
 757 }
 758
 759 static void i830_write_entry(dma_addr_t addr, unsigned int entry,
 760                              unsigned int flags)
 761 {
 762         u32 pte_flags = I810_PTE_VALID;
 763
 764         if (flags ==  AGP_USER_CACHED_MEMORY)
 765                 pte_flags |= I830_PTE_SYSTEM_CACHED;
 766
 767         writel(addr | pte_flags, intel_private.gtt + entry);
 768 }
 769
 770 static bool intel_enable_gtt(void)
 771 {
 772         u32 gma_addr;
 773         u8 __iomem *reg;
 774
 775         if (INTEL_GTT_GEN <= 2)
 776                 pci_read_config_dword(intel_private.pcidev, I810_GMADDR,
 777                                       &gma_addr);
 778         else
 779                 pci_read_config_dword(intel_private.pcidev, I915_GMADDR,
 780                                       &gma_addr);
 781
 782         intel_private.gma_bus_addr = (gma_addr & PCI_BASE_ADDRESS_MEM_MASK);
 783
 784         if (INTEL_GTT_GEN >= 6)
 785             return true;
 786
 787         if (INTEL_GTT_GEN == 2) {
 788                 u16 gmch_ctrl;
 789
 790                 pci_read_config_word(intel_private.bridge_dev,
 791                                      I830_GMCH_CTRL, &gmch_ctrl);
 792                 gmch_ctrl |= I830_GMCH_ENABLED;
 793                 pci_write_config_word(intel_private.bridge_dev,
 794                                       I830_GMCH_CTRL, gmch_ctrl);
 795
 796                 pci_read_config_word(intel_private.bridge_dev,
 797                                      I830_GMCH_CTRL, &gmch_ctrl);
 798                 if ((gmch_ctrl & I830_GMCH_ENABLED) == 0) {
 799                         dev_err(&intel_private.pcidev->dev,
 800                                 "failed to enable the GTT: GMCH_CTRL=%x\n",
 801                                 gmch_ctrl);
 802                         return false;
 803                 }
 804         }
 805
 806         /* On the resume path we may be adjusting the PGTBL value, so
 807          * be paranoid and flush all chipset write buffers...
 808          */
 809         if (INTEL_GTT_GEN >= 3)
 810                 writel(0, intel_private.registers+GFX_FLSH_CNTL);
 811
 812         reg = intel_private.registers+I810_PGETBL_CTL;
 813         writel(intel_private.PGETBL_save, reg);
 814         if (HAS_PGTBL_EN && (readl(reg) & I810_PGETBL_ENABLED) == 0) {
 815                 dev_err(&intel_private.pcidev->dev,
 816                         "failed to enable the GTT: PGETBL=%x [expected %x]\n",
 817                         readl(reg), intel_private.PGETBL_save);
 818                 return false;
 819         }
 820
 821         if (INTEL_GTT_GEN >= 3)
 822                 writel(0, intel_private.registers+GFX_FLSH_CNTL);
 823
 824         return true;
 825 }
 826
 827 static int i830_setup(void)
 828 {
 829         u32 reg_addr;
 830
 831         pci_read_config_dword(intel_private.pcidev, I810_MMADDR, &reg_addr);
 832         reg_addr &= 0xfff80000;
 833
 834         intel_private.registers = ioremap(reg_addr, KB(64));
 835         if (!intel_private.registers)
 836                 return -ENOMEM;
 837
 838         intel_private.gtt_bus_addr = reg_addr + I810_PTE_BASE;
 839
 840         return 0;
 841 }
 842
 843 static int intel_fake_agp_create_gatt_table(struct agp_bridge_data *bridge)
 844 {
 845         agp_bridge->gatt_table_real = NULL;
 846         agp_bridge->gatt_table = NULL;
 847         agp_bridge->gatt_bus_addr = 0;
 848
 849         return 0;
 850 }
 851
 852 static int intel_fake_agp_free_gatt_table(struct agp_bridge_data *bridge)
 853 {
 854         return 0;
 855 }
 856
 857 static int intel_fake_agp_configure(void)
 858 {
 859         if (!intel_enable_gtt())
 860             return -EIO;
 861
 862         intel_private.clear_fake_agp = true;
 863         agp_bridge->gart_bus_addr = intel_private.gma_bus_addr;
 864
 865         return 0;
 866 }
 867
 868 static bool i830_check_flags(unsigned int flags)
 869 {
 870         switch (flags) {
 871         case 0:
 872         case AGP_PHYS_MEMORY:
 873         case AGP_USER_CACHED_MEMORY:
 874         case AGP_USER_MEMORY:
 875                 return true;
 876         }
 877
 878         return false;
 879 }
 880
 881 void intel_gtt_insert_sg_entries(struct scatterlist *sg_list,
 882                                  unsigned int sg_len,
 883                                  unsigned int pg_start,
 884                                  unsigned int flags)
 885 {
 886         struct scatterlist *sg;
 887         unsigned int len, m;
 888         int i, j;
 889
 890         j = pg_start;
 891
 892         /* sg may merge pages, but we have to separate
 893          * per-page addr for GTT */
 894         for_each_sg(sg_list, sg, sg_len, i) {
 895                 len = sg_dma_len(sg) >> PAGE_SHIFT;
 896                 for (m = 0; m < len; m++) {
 897                         dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
 898                         intel_private.driver->write_entry(addr,
 899                                                           j, flags);
 900                         j++;
 901                 }
 902         }
 903         readl(intel_private.gtt+j-1);
 904 }
 905 EXPORT_SYMBOL(intel_gtt_insert_sg_entries);
 906
 907 void intel_gtt_insert_pages(unsigned int first_entry, unsigned int num_entries,
 908                             struct page **pages, unsigned int flags)
 909 {
 910         int i, j;
 911
 912         for (i = 0, j = first_entry; i < num_entries; i++, j++) {
 913                 dma_addr_t addr = page_to_phys(pages[i]);
 914                 intel_private.driver->write_entry(addr,
 915                                                   j, flags);
 916         }
 917         readl(intel_private.gtt+j-1);
 918 }
 919 EXPORT_SYMBOL(intel_gtt_insert_pages);
 920
 921 static int intel_fake_agp_insert_entries(struct agp_memory *mem,
 922                                          off_t pg_start, int type)
 923 {
 924         int ret = -EINVAL;
 925
 926         if (intel_private.base.do_idle_maps)
 927                 return -ENODEV;
 928
 929         if (intel_private.clear_fake_agp) {
 930                 int start = intel_private.base.stolen_size / PAGE_SIZE;
 931                 int end = intel_private.base.gtt_mappable_entries;
 932                 intel_gtt_clear_range(start, end - start);
 933                 intel_private.clear_fake_agp = false;
 934         }
 935
 936         if (INTEL_GTT_GEN == 1 && type == AGP_DCACHE_MEMORY)
 937                 return i810_insert_dcache_entries(mem, pg_start, type);
 938
 939         if (mem->page_count == 0)
 940                 goto out;
 941
 942         if (pg_start + mem->page_count > intel_private.base.gtt_total_entries)
 943                 goto out_err;
 944
 945         if (type != mem->type)
 946                 goto out_err;
 947
 948         if (!intel_private.driver->check_flags(type))
 949                 goto out_err;
 950
 951         if (!mem->is_flushed)
 952                 global_cache_flush();
 953
 954         if (intel_private.base.needs_dmar) {
 955                 ret = intel_gtt_map_memory(mem->pages, mem->page_count,
 956                                            &mem->sg_list, &mem->num_sg);
 957                 if (ret != 0)
 958                         return ret;
 959
 960                 intel_gtt_insert_sg_entries(mem->sg_list, mem->num_sg,
 961                                             pg_start, type);
 962         } else
 963                 intel_gtt_insert_pages(pg_start, mem->page_count, mem->pages,
 964                                        type);
 965
 966 out:
 967         ret = 0;
 968 out_err:
 969         mem->is_flushed = true;
 970         return ret;
 971 }
 972
 973 void intel_gtt_clear_range(unsigned int first_entry, unsigned int num_entries)
 974 {
 975         unsigned int i;
 976
 977         for (i = first_entry; i < (first_entry + num_entries); i++) {
 978                 intel_private.driver->write_entry(intel_private.base.scratch_page_dma,
 979                                                   i, 0);
 980         }
 981         readl(intel_private.gtt+i-1);
 982 }
 983 EXPORT_SYMBOL(intel_gtt_clear_range);
 984
 985 static int intel_fake_agp_remove_entries(struct agp_memory *mem,
 986                                          off_t pg_start, int type)
 987 {
 988         if (mem->page_count == 0)
 989                 return 0;
 990
 991         if (intel_private.base.do_idle_maps)
 992                 return -ENODEV;
 993
 994         intel_gtt_clear_range(pg_start, mem->page_count);
 995
 996         if (intel_private.base.needs_dmar) {
 997                 intel_gtt_unmap_memory(mem->sg_list, mem->num_sg);
 998                 mem->sg_list = NULL;
 999                 mem->num_sg = 0;
1000         }
1001
1002         return 0;
1003 }
1004
1005 static struct agp_memory *intel_fake_agp_alloc_by_type(size_t pg_count,
1006                                                        int type)
1007 {
1008         struct agp_memory *new;
1009
1010         if (type == AGP_DCACHE_MEMORY && INTEL_GTT_GEN == 1) {
1011                 if (pg_count != intel_private.num_dcache_entries)
1012                         return NULL;
1013
1014                 new = agp_create_memory(1);
1015                 if (new == NULL)
1016                         return NULL;
1017
1018                 new->type = AGP_DCACHE_MEMORY;
1019                 new->page_count = pg_count;
1020                 new->num_scratch_pages = 0;
1021                 agp_free_page_array(new);
1022                 return new;
1023         }
1024         if (type == AGP_PHYS_MEMORY)
1025                 return alloc_agpphysmem_i8xx(pg_count, type);
1026         /* always return NULL for other allocation types for now */
1027         return NULL;
1028 }
1029
1030 static int intel_alloc_chipset_flush_resource(void)
1031 {
1032         int ret;
1033         ret = pci_bus_alloc_resource(intel_private.bridge_dev->bus, &intel_private.ifp_resource, PAGE_SIZE,
1034                                      PAGE_SIZE, PCIBIOS_MIN_MEM, 0,
1035                                      pcibios_align_resource, intel_private.bridge_dev);
1036
1037         return ret;
1038 }
1039
1040 static void intel_i915_setup_chipset_flush(void)
1041 {
1042         int ret;
1043         u32 temp;
1044
1045         pci_read_config_dword(intel_private.bridge_dev, I915_IFPADDR, &temp);
1046         if (!(temp & 0x1)) {
1047                 intel_alloc_chipset_flush_resource();
1048                 intel_private.resource_valid = 1;
1049                 pci_write_config_dword(intel_private.bridge_dev, I915_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1050         } else {
1051                 temp &= ~1;
1052
1053                 intel_private.resource_valid = 1;
1054                 intel_private.ifp_resource.start = temp;
1055                 intel_private.ifp_resource.end = temp + PAGE_SIZE;
1056                 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1057                 /* some BIOSes reserve this area in a pnp some don't */
1058                 if (ret)
1059                         intel_private.resource_valid = 0;
1060         }
1061 }
1062
1063 static void intel_i965_g33_setup_chipset_flush(void)
1064 {
1065         u32 temp_hi, temp_lo;
1066         int ret;
1067
1068         pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4, &temp_hi);
1069         pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR, &temp_lo);
1070
1071         if (!(temp_lo & 0x1)) {
1072
1073                 intel_alloc_chipset_flush_resource();
1074
1075                 intel_private.resource_valid = 1;
1076                 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4,
1077                         upper_32_bits(intel_private.ifp_resource.start));
1078                 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1079         } else {
1080                 u64 l64;
1081
1082                 temp_lo &= ~0x1;
1083                 l64 = ((u64)temp_hi << 32) | temp_lo;
1084
1085                 intel_private.resource_valid = 1;
1086                 intel_private.ifp_resource.start = l64;
1087                 intel_private.ifp_resource.end = l64 + PAGE_SIZE;
1088                 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1089                 /* some BIOSes reserve this area in a pnp some don't */
1090                 if (ret)
1091                         intel_private.resource_valid = 0;
1092         }
1093 }
1094
1095 static void intel_i9xx_setup_flush(void)
1096 {
1097         /* return if already configured */
1098         if (intel_private.ifp_resource.start)
1099                 return;
1100
1101         if (INTEL_GTT_GEN == 6)
1102                 return;
1103
1104         /* setup a resource for this object */
1105         intel_private.ifp_resource.name = "Intel Flush Page";
1106         intel_private.ifp_resource.flags = IORESOURCE_MEM;
1107
1108         /* Setup chipset flush for 915 */
1109         if (IS_G33 || INTEL_GTT_GEN >= 4) {
1110                 intel_i965_g33_setup_chipset_flush();
1111         } else {
1112                 intel_i915_setup_chipset_flush();
1113         }
1114
1115         if (intel_private.ifp_resource.start)
1116                 intel_private.i9xx_flush_page = ioremap_nocache(intel_private.ifp_resource.start, PAGE_SIZE);
1117         if (!intel_private.i9xx_flush_page)
1118                 dev_err(&intel_private.pcidev->dev,
1119                         "can't ioremap flush page - no chipset flushing\n");
1120 }
1121
1122 static void i9xx_cleanup(void)
1123 {
1124         if (intel_private.i9xx_flush_page)
1125                 iounmap(intel_private.i9xx_flush_page);
1126         if (intel_private.resource_valid)
1127                 release_resource(&intel_private.ifp_resource);
1128         intel_private.ifp_resource.start = 0;
1129         intel_private.resource_valid = 0;
1130 }
1131
1132 static void i9xx_chipset_flush(void)
1133 {
1134         if (intel_private.i9xx_flush_page)
1135                 writel(1, intel_private.i9xx_flush_page);
1136 }
1137
1138 static void i965_write_entry(dma_addr_t addr,
1139                              unsigned int entry,
1140                              unsigned int flags)
1141 {
1142         u32 pte_flags;
1143
1144         pte_flags = I810_PTE_VALID;
1145         if (flags == AGP_USER_CACHED_MEMORY)
1146                 pte_flags |= I830_PTE_SYSTEM_CACHED;
1147
1148         /* Shift high bits down */
1149         addr |= (addr >> 28) & 0xf0;
1150         writel(addr | pte_flags, intel_private.gtt + entry);
1151 }
1152
1153 static bool gen6_check_flags(unsigned int flags)
1154 {
1155         return true;
1156 }
1157
1158 static void gen6_write_entry(dma_addr_t addr, unsigned int entry,
1159                              unsigned int flags)
1160 {
1161         unsigned int type_mask = flags & ~AGP_USER_CACHED_MEMORY_GFDT;
1162         unsigned int gfdt = flags & AGP_USER_CACHED_MEMORY_GFDT;
1163         u32 pte_flags;
1164
1165         if (type_mask == AGP_USER_MEMORY)
1166                 pte_flags = GEN6_PTE_UNCACHED | I810_PTE_VALID;
1167         else if (type_mask == AGP_USER_CACHED_MEMORY_LLC_MLC) {
1168                 pte_flags = GEN6_PTE_LLC_MLC | I810_PTE_VALID;
1169                 if (gfdt)
1170                         pte_flags |= GEN6_PTE_GFDT;
1171         } else { /* set 'normal'/'cached' to LLC by default */
1172                 pte_flags = GEN6_PTE_LLC | I810_PTE_VALID;
1173                 if (gfdt)
1174                         pte_flags |= GEN6_PTE_GFDT;
1175         }
1176
1177         /* gen6 has bit11-4 for physical addr bit39-32 */
1178         addr |= (addr >> 28) & 0xff0;
1179         writel(addr | pte_flags, intel_private.gtt + entry);
1180 }
1181
1182 static void gen6_cleanup(void)
1183 {
1184 }
1185
1186 /* Certain Gen5 chipsets require require idling the GPU before
1187  * unmapping anything from the GTT when VT-d is enabled.
1188  */
1189 static inline int needs_idle_maps(void)
1190 {
1191 #ifdef CONFIG_INTEL_IOMMU
1192         const unsigned short gpu_devid = intel_private.pcidev->device;
1193
1194         /* Query intel_iommu to see if we need the workaround. Presumably that
1195          * was loaded first.
1196          */
1197         if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_HB ||
1198              gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
1199              intel_iommu_gfx_mapped)
1200                 return 1;
1201 #endif
1202         return 0;
1203 }
1204
1205 static int i9xx_setup(void)
1206 {
1207         u32 reg_addr;
1208
1209         pci_read_config_dword(intel_private.pcidev, I915_MMADDR, &reg_addr);
1210
1211         reg_addr &= 0xfff80000;
1212
1213         intel_private.registers = ioremap(reg_addr, 128 * 4096);
1214         if (!intel_private.registers)
1215                 return -ENOMEM;
1216
1217         if (INTEL_GTT_GEN == 3) {
1218                 u32 gtt_addr;
1219
1220                 pci_read_config_dword(intel_private.pcidev,
1221                                       I915_PTEADDR, &gtt_addr);
1222                 intel_private.gtt_bus_addr = gtt_addr;
1223         } else {
1224                 u32 gtt_offset;
1225
1226                 switch (INTEL_GTT_GEN) {
1227                 case 5:
1228                 case 6:
1229                         gtt_offset = MB(2);
1230                         break;
1231                 case 4:
1232                 default:
1233                         gtt_offset =  KB(512);
1234                         break;
1235                 }
1236                 intel_private.gtt_bus_addr = reg_addr + gtt_offset;
1237         }
1238
1239         if (needs_idle_maps())
1240                 intel_private.base.do_idle_maps = 1;
1241
1242         intel_i9xx_setup_flush();
1243
1244         return 0;
1245 }
1246
1247 static const struct agp_bridge_driver intel_fake_agp_driver = {
1248         .owner                  = THIS_MODULE,
1249         .size_type              = FIXED_APER_SIZE,
1250         .aperture_sizes         = intel_fake_agp_sizes,
1251         .num_aperture_sizes     = ARRAY_SIZE(intel_fake_agp_sizes),
1252         .configure              = intel_fake_agp_configure,
1253         .fetch_size             = intel_fake_agp_fetch_size,
1254         .cleanup                = intel_gtt_cleanup,
1255         .agp_enable             = intel_fake_agp_enable,
1256         .cache_flush            = global_cache_flush,
1257         .create_gatt_table      = intel_fake_agp_create_gatt_table,
1258         .free_gatt_table        = intel_fake_agp_free_gatt_table,
1259         .insert_memory          = intel_fake_agp_insert_entries,
1260         .remove_memory          = intel_fake_agp_remove_entries,
1261         .alloc_by_type          = intel_fake_agp_alloc_by_type,
1262         .free_by_type           = intel_i810_free_by_type,
1263         .agp_alloc_page         = agp_generic_alloc_page,
1264         .agp_alloc_pages        = agp_generic_alloc_pages,
1265         .agp_destroy_page       = agp_generic_destroy_page,
1266         .agp_destroy_pages      = agp_generic_destroy_pages,
1267 };
1268
1269 static const struct intel_gtt_driver i81x_gtt_driver = {
1270         .gen = 1,
1271         .has_pgtbl_enable = 1,
1272         .dma_mask_size = 32,
1273         .setup = i810_setup,
1274         .cleanup = i810_cleanup,
1275         .check_flags = i830_check_flags,
1276         .write_entry = i810_write_entry,
1277 };
1278 static const struct intel_gtt_driver i8xx_gtt_driver = {
1279         .gen = 2,
1280         .has_pgtbl_enable = 1,
1281         .setup = i830_setup,
1282         .cleanup = i830_cleanup,
1283         .write_entry = i830_write_entry,
1284         .dma_mask_size = 32,
1285         .check_flags = i830_check_flags,
1286         .chipset_flush = i830_chipset_flush,
1287 };
1288 static const struct intel_gtt_driver i915_gtt_driver = {
1289         .gen = 3,
1290         .has_pgtbl_enable = 1,
1291         .setup = i9xx_setup,
1292         .cleanup = i9xx_cleanup,
1293         /* i945 is the last gpu to need phys mem (for overlay and cursors). */
1294         .write_entry = i830_write_entry,
1295         .dma_mask_size = 32,
1296         .check_flags = i830_check_flags,
1297         .chipset_flush = i9xx_chipset_flush,
1298 };
1299 static const struct intel_gtt_driver g33_gtt_driver = {
1300         .gen = 3,
1301         .is_g33 = 1,
1302         .setup = i9xx_setup,
1303         .cleanup = i9xx_cleanup,
1304         .write_entry = i965_write_entry,
1305         .dma_mask_size = 36,
1306         .check_flags = i830_check_flags,
1307         .chipset_flush = i9xx_chipset_flush,
1308 };
1309 static const struct intel_gtt_driver pineview_gtt_driver = {
1310         .gen = 3,
1311         .is_pineview = 1, .is_g33 = 1,
1312         .setup = i9xx_setup,
1313         .cleanup = i9xx_cleanup,
1314         .write_entry = i965_write_entry,
1315         .dma_mask_size = 36,
1316         .check_flags = i830_check_flags,
1317         .chipset_flush = i9xx_chipset_flush,
1318 };
1319 static const struct intel_gtt_driver i965_gtt_driver = {
1320         .gen = 4,
1321         .has_pgtbl_enable = 1,
1322         .setup = i9xx_setup,
1323         .cleanup = i9xx_cleanup,
1324         .write_entry = i965_write_entry,
1325         .dma_mask_size = 36,
1326         .check_flags = i830_check_flags,
1327         .chipset_flush = i9xx_chipset_flush,
1328 };
1329 static const struct intel_gtt_driver g4x_gtt_driver = {
1330         .gen = 5,
1331         .setup = i9xx_setup,
1332         .cleanup = i9xx_cleanup,
1333         .write_entry = i965_write_entry,
1334         .dma_mask_size = 36,
1335         .check_flags = i830_check_flags,
1336         .chipset_flush = i9xx_chipset_flush,
1337 };
1338 static const struct intel_gtt_driver ironlake_gtt_driver = {
1339         .gen = 5,
1340         .is_ironlake = 1,
1341         .setup = i9xx_setup,
1342         .cleanup = i9xx_cleanup,
1343         .write_entry = i965_write_entry,
1344         .dma_mask_size = 36,
1345         .check_flags = i830_check_flags,
1346         .chipset_flush = i9xx_chipset_flush,
1347 };
1348 static const struct intel_gtt_driver sandybridge_gtt_driver = {
1349         .gen = 6,
1350         .setup = i9xx_setup,
1351         .cleanup = gen6_cleanup,
1352         .write_entry = gen6_write_entry,
1353         .dma_mask_size = 40,
1354         .check_flags = gen6_check_flags,
1355         .chipset_flush = i9xx_chipset_flush,
1356 };
1357
1358 /* Table to describe Intel GMCH and AGP/PCIE GART drivers.  At least one of
1359  * driver and gmch_driver must be non-null, and find_gmch will determine
1360  * which one should be used if a gmch_chip_id is present.
1361  */
1362 static const struct intel_gtt_driver_description {
1363         unsigned int gmch_chip_id;
1364         char *name;
1365         const struct intel_gtt_driver *gtt_driver;
1366 } intel_gtt_chipsets[] = {
1367         { PCI_DEVICE_ID_INTEL_82810_IG1, "i810",
1368                 &i81x_gtt_driver},
1369         { PCI_DEVICE_ID_INTEL_82810_IG3, "i810",
1370                 &i81x_gtt_driver},
1371         { PCI_DEVICE_ID_INTEL_82810E_IG, "i810",
1372                 &i81x_gtt_driver},
1373         { PCI_DEVICE_ID_INTEL_82815_CGC, "i815",
1374                 &i81x_gtt_driver},
1375         { PCI_DEVICE_ID_INTEL_82830_CGC, "830M",
1376                 &i8xx_gtt_driver},
1377         { PCI_DEVICE_ID_INTEL_82845G_IG, "845G",
1378                 &i8xx_gtt_driver},
1379         { PCI_DEVICE_ID_INTEL_82854_IG, "854",
1380                 &i8xx_gtt_driver},
1381         { PCI_DEVICE_ID_INTEL_82855GM_IG, "855GM",
1382                 &i8xx_gtt_driver},
1383         { PCI_DEVICE_ID_INTEL_82865_IG, "865",
1384                 &i8xx_gtt_driver},
1385         { PCI_DEVICE_ID_INTEL_E7221_IG, "E7221 (i915)",
1386                 &i915_gtt_driver },
1387         { PCI_DEVICE_ID_INTEL_82915G_IG, "915G",
1388                 &i915_gtt_driver },
1389         { PCI_DEVICE_ID_INTEL_82915GM_IG, "915GM",
1390                 &i915_gtt_driver },
1391         { PCI_DEVICE_ID_INTEL_82945G_IG, "945G",
1392                 &i915_gtt_driver },
1393         { PCI_DEVICE_ID_INTEL_82945GM_IG, "945GM",
1394                 &i915_gtt_driver },
1395         { PCI_DEVICE_ID_INTEL_82945GME_IG, "945GME",
1396                 &i915_gtt_driver },
1397         { PCI_DEVICE_ID_INTEL_82946GZ_IG, "946GZ",
1398                 &i965_gtt_driver },
1399         { PCI_DEVICE_ID_INTEL_82G35_IG, "G35",
1400                 &i965_gtt_driver },
1401         { PCI_DEVICE_ID_INTEL_82965Q_IG, "965Q",
1402                 &i965_gtt_driver },
1403         { PCI_DEVICE_ID_INTEL_82965G_IG, "965G",
1404                 &i965_gtt_driver },
1405         { PCI_DEVICE_ID_INTEL_82965GM_IG, "965GM",
1406                 &i965_gtt_driver },
1407         { PCI_DEVICE_ID_INTEL_82965GME_IG, "965GME/GLE",
1408                 &i965_gtt_driver },
1409         { PCI_DEVICE_ID_INTEL_G33_IG, "G33",
1410                 &g33_gtt_driver },
1411         { PCI_DEVICE_ID_INTEL_Q35_IG, "Q35",
1412                 &g33_gtt_driver },
1413         { PCI_DEVICE_ID_INTEL_Q33_IG, "Q33",
1414                 &g33_gtt_driver },
1415         { PCI_DEVICE_ID_INTEL_PINEVIEW_M_IG, "GMA3150",
1416                 &pineview_gtt_driver },
1417         { PCI_DEVICE_ID_INTEL_PINEVIEW_IG, "GMA3150",
1418                 &pineview_gtt_driver },
1419         { PCI_DEVICE_ID_INTEL_GM45_IG, "GM45",
1420                 &g4x_gtt_driver },
1421         { PCI_DEVICE_ID_INTEL_EAGLELAKE_IG, "Eaglelake",
1422                 &g4x_gtt_driver },
1423         { PCI_DEVICE_ID_INTEL_Q45_IG, "Q45/Q43",
1424                 &g4x_gtt_driver },
1425         { PCI_DEVICE_ID_INTEL_G45_IG, "G45/G43",
1426                 &g4x_gtt_driver },
1427         { PCI_DEVICE_ID_INTEL_B43_IG, "B43",
1428                 &g4x_gtt_driver },
1429         { PCI_DEVICE_ID_INTEL_B43_1_IG, "B43",
1430                 &g4x_gtt_driver },
1431         { PCI_DEVICE_ID_INTEL_G41_IG, "G41",
1432                 &g4x_gtt_driver },
1433         { PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG,
1434             "HD Graphics", &ironlake_gtt_driver },
1435         { PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG,
1436             "HD Graphics", &ironlake_gtt_driver },
1437         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_GT1_IG,
1438             "Sandybridge", &sandybridge_gtt_driver },
1439         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_GT2_IG,
1440             "Sandybridge", &sandybridge_gtt_driver },
1441         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_GT2_PLUS_IG,
1442             "Sandybridge", &sandybridge_gtt_driver },
1443         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_M_GT1_IG,
1444             "Sandybridge", &sandybridge_gtt_driver },
1445         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_M_GT2_IG,
1446             "Sandybridge", &sandybridge_gtt_driver },
1447         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_M_GT2_PLUS_IG,
1448             "Sandybridge", &sandybridge_gtt_driver },
1449         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_S_IG,
1450             "Sandybridge", &sandybridge_gtt_driver },
1451         { PCI_DEVICE_ID_INTEL_IVYBRIDGE_GT1_IG,
1452             "Ivybridge", &sandybridge_gtt_driver },
1453         { PCI_DEVICE_ID_INTEL_IVYBRIDGE_GT2_IG,
1454             "Ivybridge", &sandybridge_gtt_driver },
1455         { PCI_DEVICE_ID_INTEL_IVYBRIDGE_M_GT1_IG,
1456             "Ivybridge", &sandybridge_gtt_driver },
1457         { PCI_DEVICE_ID_INTEL_IVYBRIDGE_M_GT2_IG,
1458             "Ivybridge", &sandybridge_gtt_driver },
1459         { PCI_DEVICE_ID_INTEL_IVYBRIDGE_S_GT1_IG,
1460             "Ivybridge", &sandybridge_gtt_driver },
1461         { PCI_DEVICE_ID_INTEL_IVYBRIDGE_S_GT2_IG,
1462             "Ivybridge", &sandybridge_gtt_driver },
1463         { 0, NULL, NULL }
1464 };
1465
1466 static int find_gmch(u16 device)
1467 {
1468         struct pci_dev *gmch_device;
1469
1470         gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL, device, NULL);
1471         if (gmch_device && PCI_FUNC(gmch_device->devfn) != 0) {
1472                 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL,
1473                                              device, gmch_device);
1474         }
1475
1476         if (!gmch_device)
1477                 return 0;
1478
1479         intel_private.pcidev = gmch_device;
1480         return 1;
1481 }
1482
1483 int intel_gmch_probe(struct pci_dev *pdev,
1484                                       struct agp_bridge_data *bridge)
1485 {
1486         int i, mask;
1487         intel_private.driver = NULL;
1488
1489         for (i = 0; intel_gtt_chipsets[i].name != NULL; i++) {
1490                 if (find_gmch(intel_gtt_chipsets[i].gmch_chip_id)) {
1491                         intel_private.driver =
1492                                 intel_gtt_chipsets[i].gtt_driver;
1493                         break;
1494                 }
1495         }
1496
1497         if (!intel_private.driver)
1498                 return 0;
1499
1500         bridge->driver = &intel_fake_agp_driver;
1501         bridge->dev_private_data = &intel_private;
1502         bridge->dev = pdev;
1503
1504         intel_private.bridge_dev = pci_dev_get(pdev);
1505
1506         dev_info(&pdev->dev, "Intel %s Chipset\n", intel_gtt_chipsets[i].name);
1507
1508         mask = intel_private.driver->dma_mask_size;
1509         if (pci_set_dma_mask(intel_private.pcidev, DMA_BIT_MASK(mask)))
1510                 dev_err(&intel_private.pcidev->dev,
1511                         "set gfx device dma mask %d-bit failed!\n", mask);
1512         else
1513                 pci_set_consistent_dma_mask(intel_private.pcidev,
1514                                             DMA_BIT_MASK(mask));
1515
1516         /*if (bridge->driver == &intel_810_driver)
1517                 return 1;*/
1518
1519         if (intel_gtt_init() != 0)
1520                 return 0;
1521
1522         return 1;
1523 }
1524 EXPORT_SYMBOL(intel_gmch_probe);
1525
1526 const struct intel_gtt *intel_gtt_get(void)
1527 {
1528         return &intel_private.base;
1529 }
1530 EXPORT_SYMBOL(intel_gtt_get);
1531
1532 void intel_gtt_chipset_flush(void)
1533 {
1534         if (intel_private.driver->chipset_flush)
1535                 intel_private.driver->chipset_flush();
1536 }
1537 EXPORT_SYMBOL(intel_gtt_chipset_flush);
1538
1539 void intel_gmch_remove(struct pci_dev *pdev)
1540 {
1541         if (intel_private.pcidev)
1542                 pci_dev_put(intel_private.pcidev);
1543         if (intel_private.bridge_dev)
1544                 pci_dev_put(intel_private.bridge_dev);
1545 }
1546 EXPORT_SYMBOL(intel_gmch_remove);
1547
1548 MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
1549 MODULE_LICENSE("GPL and additional rights");