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 <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_DMAR).
  33  * Only newer chipsets need to bother with this, of course.
  34  */
  35 #ifdef CONFIG_DMAR
  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         struct intel_gtt base;
  63         const struct intel_gtt_driver *driver;
  64         struct pci_dev *pcidev; /* device one */
  65         struct pci_dev *bridge_dev;
  66         u8 __iomem *registers;
  67         phys_addr_t gtt_bus_addr;
  68         phys_addr_t gma_bus_addr;
  69         u32 PGETBL_save;
  70         u32 __iomem *gtt;               /* I915G */
  71         int num_dcache_entries;
  72         union {
  73                 void __iomem *i9xx_flush_page;
  74                 void *i8xx_flush_page;
  75         };
  76         char *i81x_gtt_table;
  77         struct page *i8xx_page;
  78         struct resource ifp_resource;
  79         int resource_valid;
  80         struct page *scratch_page;
  81         dma_addr_t scratch_page_dma;
  82 } intel_private;
  83
  84 #define INTEL_GTT_GEN   intel_private.driver->gen
  85 #define IS_G33          intel_private.driver->is_g33
  86 #define IS_PINEVIEW     intel_private.driver->is_pineview
  87 #define IS_IRONLAKE     intel_private.driver->is_ironlake
  88 #define HAS_PGTBL_EN    intel_private.driver->has_pgtbl_enable
  89
  90 int intel_gtt_map_memory(struct page **pages, unsigned int num_entries,
  91                          struct scatterlist **sg_list, int *num_sg)
  92 {
  93         struct sg_table st;
  94         struct scatterlist *sg;
  95         int i;
  96
  97         if (*sg_list)
  98                 return 0; /* already mapped (for e.g. resume */
  99
 100         DBG("try mapping %lu pages\n", (unsigned long)num_entries);
 101
 102         if (sg_alloc_table(&st, num_entries, GFP_KERNEL))
 103                 goto err;
 104
 105         *sg_list = sg = st.sgl;
 106
 107         for (i = 0 ; i < num_entries; i++, sg = sg_next(sg))
 108                 sg_set_page(sg, pages[i], PAGE_SIZE, 0);
 109
 110         *num_sg = pci_map_sg(intel_private.pcidev, *sg_list,
 111                                  num_entries, PCI_DMA_BIDIRECTIONAL);
 112         if (unlikely(!*num_sg))
 113                 goto err;
 114
 115         return 0;
 116
 117 err:
 118         sg_free_table(&st);
 119         return -ENOMEM;
 120 }
 121 EXPORT_SYMBOL(intel_gtt_map_memory);
 122
 123 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 EXPORT_SYMBOL(intel_gtt_unmap_memory);
 137
 138 static void intel_fake_agp_enable(struct agp_bridge_data *bridge, u32 mode)
 139 {
 140         return;
 141 }
 142
 143 /* Exists to support ARGB cursors */
 144 static struct page *i8xx_alloc_pages(void)
 145 {
 146         struct page *page;
 147
 148         page = alloc_pages(GFP_KERNEL | GFP_DMA32, 2);
 149         if (page == NULL)
 150                 return NULL;
 151
 152         if (set_pages_uc(page, 4) < 0) {
 153                 set_pages_wb(page, 4);
 154                 __free_pages(page, 2);
 155                 return NULL;
 156         }
 157         get_page(page);
 158         atomic_inc(&agp_bridge->current_memory_agp);
 159         return page;
 160 }
 161
 162 static void i8xx_destroy_pages(struct page *page)
 163 {
 164         if (page == NULL)
 165                 return;
 166
 167         set_pages_wb(page, 4);
 168         put_page(page);
 169         __free_pages(page, 2);
 170         atomic_dec(&agp_bridge->current_memory_agp);
 171 }
 172
 173 #define I810_GTT_ORDER 4
 174 static int i810_setup(void)
 175 {
 176         u32 reg_addr;
 177         char *gtt_table;
 178
 179         /* i81x does not preallocate the gtt. It's always 64kb in size. */
 180         gtt_table = alloc_gatt_pages(I810_GTT_ORDER);
 181         if (gtt_table == NULL)
 182                 return -ENOMEM;
 183         intel_private.i81x_gtt_table = gtt_table;
 184
 185         pci_read_config_dword(intel_private.pcidev, I810_MMADDR, &reg_addr);
 186         reg_addr &= 0xfff80000;
 187
 188         intel_private.registers = ioremap(reg_addr, KB(64));
 189         if (!intel_private.registers)
 190                 return -ENOMEM;
 191
 192         writel(virt_to_phys(gtt_table) | I810_PGETBL_ENABLED,
 193                intel_private.registers+I810_PGETBL_CTL);
 194
 195         intel_private.gtt_bus_addr = reg_addr + I810_PTE_BASE;
 196
 197         if ((readl(intel_private.registers+I810_DRAM_CTL)
 198                 & I810_DRAM_ROW_0) == I810_DRAM_ROW_0_SDRAM) {
 199                 dev_info(&intel_private.pcidev->dev,
 200                          "detected 4MB dedicated video ram\n");
 201                 intel_private.num_dcache_entries = 1024;
 202         }
 203
 204         return 0;
 205 }
 206
 207 static void i810_cleanup(void)
 208 {
 209         writel(0, intel_private.registers+I810_PGETBL_CTL);
 210         free_gatt_pages(intel_private.i81x_gtt_table, I810_GTT_ORDER);
 211 }
 212
 213 static int i810_insert_dcache_entries(struct agp_memory *mem, off_t pg_start,
 214                                       int type)
 215 {
 216         int i;
 217
 218         if ((pg_start + mem->page_count)
 219                         > intel_private.num_dcache_entries)
 220                 return -EINVAL;
 221
 222         if (!mem->is_flushed)
 223                 global_cache_flush();
 224
 225         for (i = pg_start; i < (pg_start + mem->page_count); i++) {
 226                 dma_addr_t addr = i << PAGE_SHIFT;
 227                 intel_private.driver->write_entry(addr,
 228                                                   i, type);
 229         }
 230         readl(intel_private.gtt+i-1);
 231
 232         return 0;
 233 }
 234
 235 /*
 236  * The i810/i830 requires a physical address to program its mouse
 237  * pointer into hardware.
 238  * However the Xserver still writes to it through the agp aperture.
 239  */
 240 static struct agp_memory *alloc_agpphysmem_i8xx(size_t pg_count, int type)
 241 {
 242         struct agp_memory *new;
 243         struct page *page;
 244
 245         switch (pg_count) {
 246         case 1: page = agp_bridge->driver->agp_alloc_page(agp_bridge);
 247                 break;
 248         case 4:
 249                 /* kludge to get 4 physical pages for ARGB cursor */
 250                 page = i8xx_alloc_pages();
 251                 break;
 252         default:
 253                 return NULL;
 254         }
 255
 256         if (page == NULL)
 257                 return NULL;
 258
 259         new = agp_create_memory(pg_count);
 260         if (new == NULL)
 261                 return NULL;
 262
 263         new->pages[0] = page;
 264         if (pg_count == 4) {
 265                 /* kludge to get 4 physical pages for ARGB cursor */
 266                 new->pages[1] = new->pages[0] + 1;
 267                 new->pages[2] = new->pages[1] + 1;
 268                 new->pages[3] = new->pages[2] + 1;
 269         }
 270         new->page_count = pg_count;
 271         new->num_scratch_pages = pg_count;
 272         new->type = AGP_PHYS_MEMORY;
 273         new->physical = page_to_phys(new->pages[0]);
 274         return new;
 275 }
 276
 277 static void intel_i810_free_by_type(struct agp_memory *curr)
 278 {
 279         agp_free_key(curr->key);
 280         if (curr->type == AGP_PHYS_MEMORY) {
 281                 if (curr->page_count == 4)
 282                         i8xx_destroy_pages(curr->pages[0]);
 283                 else {
 284                         agp_bridge->driver->agp_destroy_page(curr->pages[0],
 285                                                              AGP_PAGE_DESTROY_UNMAP);
 286                         agp_bridge->driver->agp_destroy_page(curr->pages[0],
 287                                                              AGP_PAGE_DESTROY_FREE);
 288                 }
 289                 agp_free_page_array(curr);
 290         }
 291         kfree(curr);
 292 }
 293
 294 static int intel_gtt_setup_scratch_page(void)
 295 {
 296         struct page *page;
 297         dma_addr_t dma_addr;
 298
 299         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
 300         if (page == NULL)
 301                 return -ENOMEM;
 302         get_page(page);
 303         set_pages_uc(page, 1);
 304
 305         if (intel_private.base.needs_dmar) {
 306                 dma_addr = pci_map_page(intel_private.pcidev, page, 0,
 307                                     PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 308                 if (pci_dma_mapping_error(intel_private.pcidev, dma_addr))
 309                         return -EINVAL;
 310
 311                 intel_private.scratch_page_dma = dma_addr;
 312         } else
 313                 intel_private.scratch_page_dma = page_to_phys(page);
 314
 315         intel_private.scratch_page = page;
 316
 317         return 0;
 318 }
 319
 320 static void i810_write_entry(dma_addr_t addr, unsigned int entry,
 321                              unsigned int flags)
 322 {
 323         u32 pte_flags = I810_PTE_VALID;
 324
 325         switch (flags) {
 326         case AGP_DCACHE_MEMORY:
 327                 pte_flags |= I810_PTE_LOCAL;
 328                 break;
 329         case AGP_USER_CACHED_MEMORY:
 330                 pte_flags |= I830_PTE_SYSTEM_CACHED;
 331                 break;
 332         }
 333
 334         writel(addr | pte_flags, intel_private.gtt + entry);
 335 }
 336
 337 static const struct aper_size_info_fixed intel_fake_agp_sizes[] = {
 338         {32, 8192, 3},
 339         {64, 16384, 4},
 340         {128, 32768, 5},
 341         {256, 65536, 6},
 342         {512, 131072, 7},
 343 };
 344
 345 static unsigned int intel_gtt_stolen_size(void)
 346 {
 347         u16 gmch_ctrl;
 348         u8 rdct;
 349         int local = 0;
 350         static const int ddt[4] = { 0, 16, 32, 64 };
 351         unsigned int stolen_size = 0;
 352
 353         if (INTEL_GTT_GEN == 1)
 354                 return 0; /* no stolen mem on i81x */
 355
 356         pci_read_config_word(intel_private.bridge_dev,
 357                              I830_GMCH_CTRL, &gmch_ctrl);
 358
 359         if (intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82830_HB ||
 360             intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82845G_HB) {
 361                 switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
 362                 case I830_GMCH_GMS_STOLEN_512:
 363                         stolen_size = KB(512);
 364                         break;
 365                 case I830_GMCH_GMS_STOLEN_1024:
 366                         stolen_size = MB(1);
 367                         break;
 368                 case I830_GMCH_GMS_STOLEN_8192:
 369                         stolen_size = MB(8);
 370                         break;
 371                 case I830_GMCH_GMS_LOCAL:
 372                         rdct = readb(intel_private.registers+I830_RDRAM_CHANNEL_TYPE);
 373                         stolen_size = (I830_RDRAM_ND(rdct) + 1) *
 374                                         MB(ddt[I830_RDRAM_DDT(rdct)]);
 375                         local = 1;
 376                         break;
 377                 default:
 378                         stolen_size = 0;
 379                         break;
 380                 }
 381         } else if (INTEL_GTT_GEN == 6) {
 382                 /*
 383                  * SandyBridge has new memory control reg at 0x50.w
 384                  */
 385                 u16 snb_gmch_ctl;
 386                 pci_read_config_word(intel_private.pcidev, SNB_GMCH_CTRL, &snb_gmch_ctl);
 387                 switch (snb_gmch_ctl & SNB_GMCH_GMS_STOLEN_MASK) {
 388                 case SNB_GMCH_GMS_STOLEN_32M:
 389                         stolen_size = MB(32);
 390                         break;
 391                 case SNB_GMCH_GMS_STOLEN_64M:
 392                         stolen_size = MB(64);
 393                         break;
 394                 case SNB_GMCH_GMS_STOLEN_96M:
 395                         stolen_size = MB(96);
 396                         break;
 397                 case SNB_GMCH_GMS_STOLEN_128M:
 398                         stolen_size = MB(128);
 399                         break;
 400                 case SNB_GMCH_GMS_STOLEN_160M:
 401                         stolen_size = MB(160);
 402                         break;
 403                 case SNB_GMCH_GMS_STOLEN_192M:
 404                         stolen_size = MB(192);
 405                         break;
 406                 case SNB_GMCH_GMS_STOLEN_224M:
 407                         stolen_size = MB(224);
 408                         break;
 409                 case SNB_GMCH_GMS_STOLEN_256M:
 410                         stolen_size = MB(256);
 411                         break;
 412                 case SNB_GMCH_GMS_STOLEN_288M:
 413                         stolen_size = MB(288);
 414                         break;
 415                 case SNB_GMCH_GMS_STOLEN_320M:
 416                         stolen_size = MB(320);
 417                         break;
 418                 case SNB_GMCH_GMS_STOLEN_352M:
 419                         stolen_size = MB(352);
 420                         break;
 421                 case SNB_GMCH_GMS_STOLEN_384M:
 422                         stolen_size = MB(384);
 423                         break;
 424                 case SNB_GMCH_GMS_STOLEN_416M:
 425                         stolen_size = MB(416);
 426                         break;
 427                 case SNB_GMCH_GMS_STOLEN_448M:
 428                         stolen_size = MB(448);
 429                         break;
 430                 case SNB_GMCH_GMS_STOLEN_480M:
 431                         stolen_size = MB(480);
 432                         break;
 433                 case SNB_GMCH_GMS_STOLEN_512M:
 434                         stolen_size = MB(512);
 435                         break;
 436                 }
 437         } else {
 438                 switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
 439                 case I855_GMCH_GMS_STOLEN_1M:
 440                         stolen_size = MB(1);
 441                         break;
 442                 case I855_GMCH_GMS_STOLEN_4M:
 443                         stolen_size = MB(4);
 444                         break;
 445                 case I855_GMCH_GMS_STOLEN_8M:
 446                         stolen_size = MB(8);
 447                         break;
 448                 case I855_GMCH_GMS_STOLEN_16M:
 449                         stolen_size = MB(16);
 450                         break;
 451                 case I855_GMCH_GMS_STOLEN_32M:
 452                         stolen_size = MB(32);
 453                         break;
 454                 case I915_GMCH_GMS_STOLEN_48M:
 455                         stolen_size = MB(48);
 456                         break;
 457                 case I915_GMCH_GMS_STOLEN_64M:
 458                         stolen_size = MB(64);
 459                         break;
 460                 case G33_GMCH_GMS_STOLEN_128M:
 461                         stolen_size = MB(128);
 462                         break;
 463                 case G33_GMCH_GMS_STOLEN_256M:
 464                         stolen_size = MB(256);
 465                         break;
 466                 case INTEL_GMCH_GMS_STOLEN_96M:
 467                         stolen_size = MB(96);
 468                         break;
 469                 case INTEL_GMCH_GMS_STOLEN_160M:
 470                         stolen_size = MB(160);
 471                         break;
 472                 case INTEL_GMCH_GMS_STOLEN_224M:
 473                         stolen_size = MB(224);
 474                         break;
 475                 case INTEL_GMCH_GMS_STOLEN_352M:
 476                         stolen_size = MB(352);
 477                         break;
 478                 default:
 479                         stolen_size = 0;
 480                         break;
 481                 }
 482         }
 483
 484         if (stolen_size > 0) {
 485                 dev_info(&intel_private.bridge_dev->dev, "detected %dK %s memory\n",
 486                        stolen_size / KB(1), local ? "local" : "stolen");
 487         } else {
 488                 dev_info(&intel_private.bridge_dev->dev,
 489                        "no pre-allocated video memory detected\n");
 490                 stolen_size = 0;
 491         }
 492
 493         return stolen_size;
 494 }
 495
 496 static void i965_adjust_pgetbl_size(unsigned int size_flag)
 497 {
 498         u32 pgetbl_ctl, pgetbl_ctl2;
 499
 500         /* ensure that ppgtt is disabled */
 501         pgetbl_ctl2 = readl(intel_private.registers+I965_PGETBL_CTL2);
 502         pgetbl_ctl2 &= ~I810_PGETBL_ENABLED;
 503         writel(pgetbl_ctl2, intel_private.registers+I965_PGETBL_CTL2);
 504
 505         /* write the new ggtt size */
 506         pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
 507         pgetbl_ctl &= ~I965_PGETBL_SIZE_MASK;
 508         pgetbl_ctl |= size_flag;
 509         writel(pgetbl_ctl, intel_private.registers+I810_PGETBL_CTL);
 510 }
 511
 512 static unsigned int i965_gtt_total_entries(void)
 513 {
 514         int size;
 515         u32 pgetbl_ctl;
 516         u16 gmch_ctl;
 517
 518         pci_read_config_word(intel_private.bridge_dev,
 519                              I830_GMCH_CTRL, &gmch_ctl);
 520
 521         if (INTEL_GTT_GEN == 5) {
 522                 switch (gmch_ctl & G4x_GMCH_SIZE_MASK) {
 523                 case G4x_GMCH_SIZE_1M:
 524                 case G4x_GMCH_SIZE_VT_1M:
 525                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1MB);
 526                         break;
 527                 case G4x_GMCH_SIZE_VT_1_5M:
 528                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1_5MB);
 529                         break;
 530                 case G4x_GMCH_SIZE_2M:
 531                 case G4x_GMCH_SIZE_VT_2M:
 532                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_2MB);
 533                         break;
 534                 }
 535         }
 536
 537         pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
 538
 539         switch (pgetbl_ctl & I965_PGETBL_SIZE_MASK) {
 540         case I965_PGETBL_SIZE_128KB:
 541                 size = KB(128);
 542                 break;
 543         case I965_PGETBL_SIZE_256KB:
 544                 size = KB(256);
 545                 break;
 546         case I965_PGETBL_SIZE_512KB:
 547                 size = KB(512);
 548                 break;
 549         /* GTT pagetable sizes bigger than 512KB are not possible on G33! */
 550         case I965_PGETBL_SIZE_1MB:
 551                 size = KB(1024);
 552                 break;
 553         case I965_PGETBL_SIZE_2MB:
 554                 size = KB(2048);
 555                 break;
 556         case I965_PGETBL_SIZE_1_5MB:
 557                 size = KB(1024 + 512);
 558                 break;
 559         default:
 560                 dev_info(&intel_private.pcidev->dev,
 561                          "unknown page table size, assuming 512KB\n");
 562                 size = KB(512);
 563         }
 564
 565         return size/4;
 566 }
 567
 568 static unsigned int intel_gtt_total_entries(void)
 569 {
 570         int size;
 571
 572         if (IS_G33 || INTEL_GTT_GEN == 4 || INTEL_GTT_GEN == 5)
 573                 return i965_gtt_total_entries();
 574         else if (INTEL_GTT_GEN == 6) {
 575                 u16 snb_gmch_ctl;
 576
 577                 pci_read_config_word(intel_private.pcidev, SNB_GMCH_CTRL, &snb_gmch_ctl);
 578                 switch (snb_gmch_ctl & SNB_GTT_SIZE_MASK) {
 579                 default:
 580                 case SNB_GTT_SIZE_0M:
 581                         printk(KERN_ERR "Bad GTT size mask: 0x%04x.\n", snb_gmch_ctl);
 582                         size = MB(0);
 583                         break;
 584                 case SNB_GTT_SIZE_1M:
 585                         size = MB(1);
 586                         break;
 587                 case SNB_GTT_SIZE_2M:
 588                         size = MB(2);
 589                         break;
 590                 }
 591                 return size/4;
 592         } else {
 593                 /* On previous hardware, the GTT size was just what was
 594                  * required to map the aperture.
 595                  */
 596                 return intel_private.base.gtt_mappable_entries;
 597         }
 598 }
 599
 600 static unsigned int intel_gtt_mappable_entries(void)
 601 {
 602         unsigned int aperture_size;
 603
 604         if (INTEL_GTT_GEN == 1) {
 605                 u32 smram_miscc;
 606
 607                 pci_read_config_dword(intel_private.bridge_dev,
 608                                       I810_SMRAM_MISCC, &smram_miscc);
 609
 610                 if ((smram_miscc & I810_GFX_MEM_WIN_SIZE)
 611                                 == I810_GFX_MEM_WIN_32M)
 612                         aperture_size = MB(32);
 613                 else
 614                         aperture_size = MB(64);
 615         } else if (INTEL_GTT_GEN == 2) {
 616                 u16 gmch_ctrl;
 617
 618                 pci_read_config_word(intel_private.bridge_dev,
 619                                      I830_GMCH_CTRL, &gmch_ctrl);
 620
 621                 if ((gmch_ctrl & I830_GMCH_MEM_MASK) == I830_GMCH_MEM_64M)
 622                         aperture_size = MB(64);
 623                 else
 624                         aperture_size = MB(128);
 625         } else {
 626                 /* 9xx supports large sizes, just look at the length */
 627                 aperture_size = pci_resource_len(intel_private.pcidev, 2);
 628         }
 629
 630         return aperture_size >> PAGE_SHIFT;
 631 }
 632
 633 static void intel_gtt_teardown_scratch_page(void)
 634 {
 635         set_pages_wb(intel_private.scratch_page, 1);
 636         pci_unmap_page(intel_private.pcidev, intel_private.scratch_page_dma,
 637                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 638         put_page(intel_private.scratch_page);
 639         __free_page(intel_private.scratch_page);
 640 }
 641
 642 static void intel_gtt_cleanup(void)
 643 {
 644         intel_private.driver->cleanup();
 645
 646         iounmap(intel_private.gtt);
 647         iounmap(intel_private.registers);
 648
 649         intel_gtt_teardown_scratch_page();
 650 }
 651
 652 static int intel_gtt_init(void)
 653 {
 654         u32 gtt_map_size;
 655         int ret;
 656
 657         ret = intel_private.driver->setup();
 658         if (ret != 0)
 659                 return ret;
 660
 661         intel_private.base.gtt_mappable_entries = intel_gtt_mappable_entries();
 662         intel_private.base.gtt_total_entries = intel_gtt_total_entries();
 663
 664         /* save the PGETBL reg for resume */
 665         intel_private.PGETBL_save =
 666                 readl(intel_private.registers+I810_PGETBL_CTL)
 667                         & ~I810_PGETBL_ENABLED;
 668         /* we only ever restore the register when enabling the PGTBL... */
 669         if (HAS_PGTBL_EN)
 670                 intel_private.PGETBL_save |= I810_PGETBL_ENABLED;
 671
 672         dev_info(&intel_private.bridge_dev->dev,
 673                         "detected gtt size: %dK total, %dK mappable\n",
 674                         intel_private.base.gtt_total_entries * 4,
 675                         intel_private.base.gtt_mappable_entries * 4);
 676
 677         gtt_map_size = intel_private.base.gtt_total_entries * 4;
 678
 679         intel_private.gtt = ioremap(intel_private.gtt_bus_addr,
 680                                     gtt_map_size);
 681         if (!intel_private.gtt) {
 682                 intel_private.driver->cleanup();
 683                 iounmap(intel_private.registers);
 684                 return -ENOMEM;
 685         }
 686
 687         global_cache_flush();   /* FIXME: ? */
 688
 689         intel_private.base.stolen_size = intel_gtt_stolen_size();
 690
 691         intel_private.base.needs_dmar = USE_PCI_DMA_API && INTEL_GTT_GEN > 2;
 692
 693         ret = intel_gtt_setup_scratch_page();
 694         if (ret != 0) {
 695                 intel_gtt_cleanup();
 696                 return ret;
 697         }
 698
 699         return 0;
 700 }
 701
 702 static int intel_fake_agp_fetch_size(void)
 703 {
 704         int num_sizes = ARRAY_SIZE(intel_fake_agp_sizes);
 705         unsigned int aper_size;
 706         int i;
 707
 708         aper_size = (intel_private.base.gtt_mappable_entries << PAGE_SHIFT)
 709                     / MB(1);
 710
 711         for (i = 0; i < num_sizes; i++) {
 712                 if (aper_size == intel_fake_agp_sizes[i].size) {
 713                         agp_bridge->current_size =
 714                                 (void *) (intel_fake_agp_sizes + i);
 715                         return aper_size;
 716                 }
 717         }
 718
 719         return 0;
 720 }
 721
 722 static void i830_cleanup(void)
 723 {
 724         if (intel_private.i8xx_flush_page) {
 725                 kunmap(intel_private.i8xx_flush_page);
 726                 intel_private.i8xx_flush_page = NULL;
 727         }
 728
 729         __free_page(intel_private.i8xx_page);
 730         intel_private.i8xx_page = NULL;
 731 }
 732
 733 static void intel_i830_setup_flush(void)
 734 {
 735         /* return if we've already set the flush mechanism up */
 736         if (intel_private.i8xx_page)
 737                 return;
 738
 739         intel_private.i8xx_page = alloc_page(GFP_KERNEL);
 740         if (!intel_private.i8xx_page)
 741                 return;
 742
 743         intel_private.i8xx_flush_page = kmap(intel_private.i8xx_page);
 744         if (!intel_private.i8xx_flush_page)
 745                 i830_cleanup();
 746 }
 747
 748 /* The chipset_flush interface needs to get data that has already been
 749  * flushed out of the CPU all the way out to main memory, because the GPU
 750  * doesn't snoop those buffers.
 751  *
 752  * The 8xx series doesn't have the same lovely interface for flushing the
 753  * chipset write buffers that the later chips do. According to the 865
 754  * specs, it's 64 octwords, or 1KB.  So, to get those previous things in
 755  * that buffer out, we just fill 1KB and clflush it out, on the assumption
 756  * that it'll push whatever was in there out.  It appears to work.
 757  */
 758 static void i830_chipset_flush(void)
 759 {
 760         unsigned int *pg = intel_private.i8xx_flush_page;
 761
 762         memset(pg, 0, 1024);
 763
 764         if (cpu_has_clflush)
 765                 clflush_cache_range(pg, 1024);
 766         else if (wbinvd_on_all_cpus() != 0)
 767                 printk(KERN_ERR "Timed out waiting for cache flush.\n");
 768 }
 769
 770 static void i830_write_entry(dma_addr_t addr, unsigned int entry,
 771                              unsigned int flags)
 772 {
 773         u32 pte_flags = I810_PTE_VALID;
 774
 775         if (flags ==  AGP_USER_CACHED_MEMORY)
 776                 pte_flags |= I830_PTE_SYSTEM_CACHED;
 777
 778         writel(addr | pte_flags, intel_private.gtt + entry);
 779 }
 780
 781 static bool intel_enable_gtt(void)
 782 {
 783         u32 gma_addr;
 784         u8 __iomem *reg;
 785
 786         if (INTEL_GTT_GEN <= 2)
 787                 pci_read_config_dword(intel_private.pcidev, I810_GMADDR,
 788                                       &gma_addr);
 789         else
 790                 pci_read_config_dword(intel_private.pcidev, I915_GMADDR,
 791                                       &gma_addr);
 792
 793         intel_private.gma_bus_addr = (gma_addr & PCI_BASE_ADDRESS_MEM_MASK);
 794
 795         if (INTEL_GTT_GEN >= 6)
 796             return true;
 797
 798         if (INTEL_GTT_GEN == 2) {
 799                 u16 gmch_ctrl;
 800
 801                 pci_read_config_word(intel_private.bridge_dev,
 802                                      I830_GMCH_CTRL, &gmch_ctrl);
 803                 gmch_ctrl |= I830_GMCH_ENABLED;
 804                 pci_write_config_word(intel_private.bridge_dev,
 805                                       I830_GMCH_CTRL, gmch_ctrl);
 806
 807                 pci_read_config_word(intel_private.bridge_dev,
 808                                      I830_GMCH_CTRL, &gmch_ctrl);
 809                 if ((gmch_ctrl & I830_GMCH_ENABLED) == 0) {
 810                         dev_err(&intel_private.pcidev->dev,
 811                                 "failed to enable the GTT: GMCH_CTRL=%x\n",
 812                                 gmch_ctrl);
 813                         return false;
 814                 }
 815         }
 816
 817         /* On the resume path we may be adjusting the PGTBL value, so
 818          * be paranoid and flush all chipset write buffers...
 819          */
 820         if (INTEL_GTT_GEN >= 3)
 821                 writel(0, intel_private.registers+GFX_FLSH_CNTL);
 822
 823         reg = intel_private.registers+I810_PGETBL_CTL;
 824         writel(intel_private.PGETBL_save, reg);
 825         if (HAS_PGTBL_EN && (readl(reg) & I810_PGETBL_ENABLED) == 0) {
 826                 dev_err(&intel_private.pcidev->dev,
 827                         "failed to enable the GTT: PGETBL=%x [expected %x]\n",
 828                         readl(reg), intel_private.PGETBL_save);
 829                 return false;
 830         }
 831
 832         if (INTEL_GTT_GEN >= 3)
 833                 writel(0, intel_private.registers+GFX_FLSH_CNTL);
 834
 835         return true;
 836 }
 837
 838 static int i830_setup(void)
 839 {
 840         u32 reg_addr;
 841
 842         pci_read_config_dword(intel_private.pcidev, I810_MMADDR, &reg_addr);
 843         reg_addr &= 0xfff80000;
 844
 845         intel_private.registers = ioremap(reg_addr, KB(64));
 846         if (!intel_private.registers)
 847                 return -ENOMEM;
 848
 849         intel_private.gtt_bus_addr = reg_addr + I810_PTE_BASE;
 850
 851         intel_i830_setup_flush();
 852
 853         return 0;
 854 }
 855
 856 static int intel_fake_agp_create_gatt_table(struct agp_bridge_data *bridge)
 857 {
 858         agp_bridge->gatt_table_real = NULL;
 859         agp_bridge->gatt_table = NULL;
 860         agp_bridge->gatt_bus_addr = 0;
 861
 862         return 0;
 863 }
 864
 865 static int intel_fake_agp_free_gatt_table(struct agp_bridge_data *bridge)
 866 {
 867         return 0;
 868 }
 869
 870 static int intel_fake_agp_configure(void)
 871 {
 872         int i;
 873
 874         if (!intel_enable_gtt())
 875             return -EIO;
 876
 877         agp_bridge->gart_bus_addr = intel_private.gma_bus_addr;
 878
 879         for (i = 0; i < intel_private.base.gtt_total_entries; i++) {
 880                 intel_private.driver->write_entry(intel_private.scratch_page_dma,
 881                                                   i, 0);
 882         }
 883         readl(intel_private.gtt+i-1);   /* PCI Posting. */
 884
 885         global_cache_flush();
 886
 887         return 0;
 888 }
 889
 890 static bool i830_check_flags(unsigned int flags)
 891 {
 892         switch (flags) {
 893         case 0:
 894         case AGP_PHYS_MEMORY:
 895         case AGP_USER_CACHED_MEMORY:
 896         case AGP_USER_MEMORY:
 897                 return true;
 898         }
 899
 900         return false;
 901 }
 902
 903 void intel_gtt_insert_sg_entries(struct scatterlist *sg_list,
 904                                  unsigned int sg_len,
 905                                  unsigned int pg_start,
 906                                  unsigned int flags)
 907 {
 908         struct scatterlist *sg;
 909         unsigned int len, m;
 910         int i, j;
 911
 912         j = pg_start;
 913
 914         /* sg may merge pages, but we have to separate
 915          * per-page addr for GTT */
 916         for_each_sg(sg_list, sg, sg_len, i) {
 917                 len = sg_dma_len(sg) >> PAGE_SHIFT;
 918                 for (m = 0; m < len; m++) {
 919                         dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
 920                         intel_private.driver->write_entry(addr,
 921                                                           j, flags);
 922                         j++;
 923                 }
 924         }
 925         readl(intel_private.gtt+j-1);
 926 }
 927 EXPORT_SYMBOL(intel_gtt_insert_sg_entries);
 928
 929 void intel_gtt_insert_pages(unsigned int first_entry, unsigned int num_entries,
 930                             struct page **pages, unsigned int flags)
 931 {
 932         int i, j;
 933
 934         for (i = 0, j = first_entry; i < num_entries; i++, j++) {
 935                 dma_addr_t addr = page_to_phys(pages[i]);
 936                 intel_private.driver->write_entry(addr,
 937                                                   j, flags);
 938         }
 939         readl(intel_private.gtt+j-1);
 940 }
 941 EXPORT_SYMBOL(intel_gtt_insert_pages);
 942
 943 static int intel_fake_agp_insert_entries(struct agp_memory *mem,
 944                                          off_t pg_start, int type)
 945 {
 946         int ret = -EINVAL;
 947
 948         if (INTEL_GTT_GEN == 1 && type == AGP_DCACHE_MEMORY)
 949                 return i810_insert_dcache_entries(mem, pg_start, type);
 950
 951         if (mem->page_count == 0)
 952                 goto out;
 953
 954         if (pg_start + mem->page_count > intel_private.base.gtt_total_entries)
 955                 goto out_err;
 956
 957         if (type != mem->type)
 958                 goto out_err;
 959
 960         if (!intel_private.driver->check_flags(type))
 961                 goto out_err;
 962
 963         if (!mem->is_flushed)
 964                 global_cache_flush();
 965
 966         if (intel_private.base.needs_dmar) {
 967                 ret = intel_gtt_map_memory(mem->pages, mem->page_count,
 968                                            &mem->sg_list, &mem->num_sg);
 969                 if (ret != 0)
 970                         return ret;
 971
 972                 intel_gtt_insert_sg_entries(mem->sg_list, mem->num_sg,
 973                                             pg_start, type);
 974         } else
 975                 intel_gtt_insert_pages(pg_start, mem->page_count, mem->pages,
 976                                        type);
 977
 978 out:
 979         ret = 0;
 980 out_err:
 981         mem->is_flushed = true;
 982         return ret;
 983 }
 984
 985 void intel_gtt_clear_range(unsigned int first_entry, unsigned int num_entries)
 986 {
 987         unsigned int i;
 988
 989         for (i = first_entry; i < (first_entry + num_entries); i++) {
 990                 intel_private.driver->write_entry(intel_private.scratch_page_dma,
 991                                                   i, 0);
 992         }
 993         readl(intel_private.gtt+i-1);
 994 }
 995 EXPORT_SYMBOL(intel_gtt_clear_range);
 996
 997 static int intel_fake_agp_remove_entries(struct agp_memory *mem,
 998                                          off_t pg_start, int type)
 999 {
1000         if (mem->page_count == 0)
1001                 return 0;
1002
1003         intel_gtt_clear_range(pg_start, mem->page_count);
1004
1005         if (intel_private.base.needs_dmar) {
1006                 intel_gtt_unmap_memory(mem->sg_list, mem->num_sg);
1007                 mem->sg_list = NULL;
1008                 mem->num_sg = 0;
1009         }
1010
1011         return 0;
1012 }
1013
1014 static struct agp_memory *intel_fake_agp_alloc_by_type(size_t pg_count,
1015                                                        int type)
1016 {
1017         struct agp_memory *new;
1018
1019         if (type == AGP_DCACHE_MEMORY && INTEL_GTT_GEN == 1) {
1020                 if (pg_count != intel_private.num_dcache_entries)
1021                         return NULL;
1022
1023                 new = agp_create_memory(1);
1024                 if (new == NULL)
1025                         return NULL;
1026
1027                 new->type = AGP_DCACHE_MEMORY;
1028                 new->page_count = pg_count;
1029                 new->num_scratch_pages = 0;
1030                 agp_free_page_array(new);
1031                 return new;
1032         }
1033         if (type == AGP_PHYS_MEMORY)
1034                 return alloc_agpphysmem_i8xx(pg_count, type);
1035         /* always return NULL for other allocation types for now */
1036         return NULL;
1037 }
1038
1039 static int intel_alloc_chipset_flush_resource(void)
1040 {
1041         int ret;
1042         ret = pci_bus_alloc_resource(intel_private.bridge_dev->bus, &intel_private.ifp_resource, PAGE_SIZE,
1043                                      PAGE_SIZE, PCIBIOS_MIN_MEM, 0,
1044                                      pcibios_align_resource, intel_private.bridge_dev);
1045
1046         return ret;
1047 }
1048
1049 static void intel_i915_setup_chipset_flush(void)
1050 {
1051         int ret;
1052         u32 temp;
1053
1054         pci_read_config_dword(intel_private.bridge_dev, I915_IFPADDR, &temp);
1055         if (!(temp & 0x1)) {
1056                 intel_alloc_chipset_flush_resource();
1057                 intel_private.resource_valid = 1;
1058                 pci_write_config_dword(intel_private.bridge_dev, I915_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1059         } else {
1060                 temp &= ~1;
1061
1062                 intel_private.resource_valid = 1;
1063                 intel_private.ifp_resource.start = temp;
1064                 intel_private.ifp_resource.end = temp + PAGE_SIZE;
1065                 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1066                 /* some BIOSes reserve this area in a pnp some don't */
1067                 if (ret)
1068                         intel_private.resource_valid = 0;
1069         }
1070 }
1071
1072 static void intel_i965_g33_setup_chipset_flush(void)
1073 {
1074         u32 temp_hi, temp_lo;
1075         int ret;
1076
1077         pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4, &temp_hi);
1078         pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR, &temp_lo);
1079
1080         if (!(temp_lo & 0x1)) {
1081
1082                 intel_alloc_chipset_flush_resource();
1083
1084                 intel_private.resource_valid = 1;
1085                 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4,
1086                         upper_32_bits(intel_private.ifp_resource.start));
1087                 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1088         } else {
1089                 u64 l64;
1090
1091                 temp_lo &= ~0x1;
1092                 l64 = ((u64)temp_hi << 32) | temp_lo;
1093
1094                 intel_private.resource_valid = 1;
1095                 intel_private.ifp_resource.start = l64;
1096                 intel_private.ifp_resource.end = l64 + PAGE_SIZE;
1097                 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1098                 /* some BIOSes reserve this area in a pnp some don't */
1099                 if (ret)
1100                         intel_private.resource_valid = 0;
1101         }
1102 }
1103
1104 static void intel_i9xx_setup_flush(void)
1105 {
1106         /* return if already configured */
1107         if (intel_private.ifp_resource.start)
1108                 return;
1109
1110         if (INTEL_GTT_GEN == 6)
1111                 return;
1112
1113         /* setup a resource for this object */
1114         intel_private.ifp_resource.name = "Intel Flush Page";
1115         intel_private.ifp_resource.flags = IORESOURCE_MEM;
1116
1117         /* Setup chipset flush for 915 */
1118         if (IS_G33 || INTEL_GTT_GEN >= 4) {
1119                 intel_i965_g33_setup_chipset_flush();
1120         } else {
1121                 intel_i915_setup_chipset_flush();
1122         }
1123
1124         if (intel_private.ifp_resource.start)
1125                 intel_private.i9xx_flush_page = ioremap_nocache(intel_private.ifp_resource.start, PAGE_SIZE);
1126         if (!intel_private.i9xx_flush_page)
1127                 dev_err(&intel_private.pcidev->dev,
1128                         "can't ioremap flush page - no chipset flushing\n");
1129 }
1130
1131 static void i9xx_cleanup(void)
1132 {
1133         if (intel_private.i9xx_flush_page)
1134                 iounmap(intel_private.i9xx_flush_page);
1135         if (intel_private.resource_valid)
1136                 release_resource(&intel_private.ifp_resource);
1137         intel_private.ifp_resource.start = 0;
1138         intel_private.resource_valid = 0;
1139 }
1140
1141 static void i9xx_chipset_flush(void)
1142 {
1143         if (intel_private.i9xx_flush_page)
1144                 writel(1, intel_private.i9xx_flush_page);
1145 }
1146
1147 static void i965_write_entry(dma_addr_t addr,
1148                              unsigned int entry,
1149                              unsigned int flags)
1150 {
1151         u32 pte_flags;
1152
1153         pte_flags = I810_PTE_VALID;
1154         if (flags == AGP_USER_CACHED_MEMORY)
1155                 pte_flags |= I830_PTE_SYSTEM_CACHED;
1156
1157         /* Shift high bits down */
1158         addr |= (addr >> 28) & 0xf0;
1159         writel(addr | pte_flags, intel_private.gtt + entry);
1160 }
1161
1162 static bool gen6_check_flags(unsigned int flags)
1163 {
1164         return true;
1165 }
1166
1167 static void gen6_write_entry(dma_addr_t addr, unsigned int entry,
1168                              unsigned int flags)
1169 {
1170         unsigned int type_mask = flags & ~AGP_USER_CACHED_MEMORY_GFDT;
1171         unsigned int gfdt = flags & AGP_USER_CACHED_MEMORY_GFDT;
1172         u32 pte_flags;
1173
1174         if (type_mask == AGP_USER_MEMORY)
1175                 pte_flags = GEN6_PTE_UNCACHED | I810_PTE_VALID;
1176         else if (type_mask == AGP_USER_CACHED_MEMORY_LLC_MLC) {
1177                 pte_flags = GEN6_PTE_LLC_MLC | I810_PTE_VALID;
1178                 if (gfdt)
1179                         pte_flags |= GEN6_PTE_GFDT;
1180         } else { /* set 'normal'/'cached' to LLC by default */
1181                 pte_flags = GEN6_PTE_LLC | I810_PTE_VALID;
1182                 if (gfdt)
1183                         pte_flags |= GEN6_PTE_GFDT;
1184         }
1185
1186         /* gen6 has bit11-4 for physical addr bit39-32 */
1187         addr |= (addr >> 28) & 0xff0;
1188         writel(addr | pte_flags, intel_private.gtt + entry);
1189 }
1190
1191 static void gen6_cleanup(void)
1192 {
1193 }
1194
1195 static int i9xx_setup(void)
1196 {
1197         u32 reg_addr;
1198
1199         pci_read_config_dword(intel_private.pcidev, I915_MMADDR, &reg_addr);
1200
1201         reg_addr &= 0xfff80000;
1202
1203         intel_private.registers = ioremap(reg_addr, 128 * 4096);
1204         if (!intel_private.registers)
1205                 return -ENOMEM;
1206
1207         if (INTEL_GTT_GEN == 3) {
1208                 u32 gtt_addr;
1209
1210                 pci_read_config_dword(intel_private.pcidev,
1211                                       I915_PTEADDR, &gtt_addr);
1212                 intel_private.gtt_bus_addr = gtt_addr;
1213         } else {
1214                 u32 gtt_offset;
1215
1216                 switch (INTEL_GTT_GEN) {
1217                 case 5:
1218                 case 6:
1219                         gtt_offset = MB(2);
1220                         break;
1221                 case 4:
1222                 default:
1223                         gtt_offset =  KB(512);
1224                         break;
1225                 }
1226                 intel_private.gtt_bus_addr = reg_addr + gtt_offset;
1227         }
1228
1229         intel_i9xx_setup_flush();
1230
1231         return 0;
1232 }
1233
1234 static const struct agp_bridge_driver intel_fake_agp_driver = {
1235         .owner                  = THIS_MODULE,
1236         .size_type              = FIXED_APER_SIZE,
1237         .aperture_sizes         = intel_fake_agp_sizes,
1238         .num_aperture_sizes     = ARRAY_SIZE(intel_fake_agp_sizes),
1239         .configure              = intel_fake_agp_configure,
1240         .fetch_size             = intel_fake_agp_fetch_size,
1241         .cleanup                = intel_gtt_cleanup,
1242         .agp_enable             = intel_fake_agp_enable,
1243         .cache_flush            = global_cache_flush,
1244         .create_gatt_table      = intel_fake_agp_create_gatt_table,
1245         .free_gatt_table        = intel_fake_agp_free_gatt_table,
1246         .insert_memory          = intel_fake_agp_insert_entries,
1247         .remove_memory          = intel_fake_agp_remove_entries,
1248         .alloc_by_type          = intel_fake_agp_alloc_by_type,
1249         .free_by_type           = intel_i810_free_by_type,
1250         .agp_alloc_page         = agp_generic_alloc_page,
1251         .agp_alloc_pages        = agp_generic_alloc_pages,
1252         .agp_destroy_page       = agp_generic_destroy_page,
1253         .agp_destroy_pages      = agp_generic_destroy_pages,
1254 };
1255
1256 static const struct intel_gtt_driver i81x_gtt_driver = {
1257         .gen = 1,
1258         .has_pgtbl_enable = 1,
1259         .dma_mask_size = 32,
1260         .setup = i810_setup,
1261         .cleanup = i810_cleanup,
1262         .check_flags = i830_check_flags,
1263         .write_entry = i810_write_entry,
1264 };
1265 static const struct intel_gtt_driver i8xx_gtt_driver = {
1266         .gen = 2,
1267         .has_pgtbl_enable = 1,
1268         .setup = i830_setup,
1269         .cleanup = i830_cleanup,
1270         .write_entry = i830_write_entry,
1271         .dma_mask_size = 32,
1272         .check_flags = i830_check_flags,
1273         .chipset_flush = i830_chipset_flush,
1274 };
1275 static const struct intel_gtt_driver i915_gtt_driver = {
1276         .gen = 3,
1277         .has_pgtbl_enable = 1,
1278         .setup = i9xx_setup,
1279         .cleanup = i9xx_cleanup,
1280         /* i945 is the last gpu to need phys mem (for overlay and cursors). */
1281         .write_entry = i830_write_entry,
1282         .dma_mask_size = 32,
1283         .check_flags = i830_check_flags,
1284         .chipset_flush = i9xx_chipset_flush,
1285 };
1286 static const struct intel_gtt_driver g33_gtt_driver = {
1287         .gen = 3,
1288         .is_g33 = 1,
1289         .setup = i9xx_setup,
1290         .cleanup = i9xx_cleanup,
1291         .write_entry = i965_write_entry,
1292         .dma_mask_size = 36,
1293         .check_flags = i830_check_flags,
1294         .chipset_flush = i9xx_chipset_flush,
1295 };
1296 static const struct intel_gtt_driver pineview_gtt_driver = {
1297         .gen = 3,
1298         .is_pineview = 1, .is_g33 = 1,
1299         .setup = i9xx_setup,
1300         .cleanup = i9xx_cleanup,
1301         .write_entry = i965_write_entry,
1302         .dma_mask_size = 36,
1303         .check_flags = i830_check_flags,
1304         .chipset_flush = i9xx_chipset_flush,
1305 };
1306 static const struct intel_gtt_driver i965_gtt_driver = {
1307         .gen = 4,
1308         .has_pgtbl_enable = 1,
1309         .setup = i9xx_setup,
1310         .cleanup = i9xx_cleanup,
1311         .write_entry = i965_write_entry,
1312         .dma_mask_size = 36,
1313         .check_flags = i830_check_flags,
1314         .chipset_flush = i9xx_chipset_flush,
1315 };
1316 static const struct intel_gtt_driver g4x_gtt_driver = {
1317         .gen = 5,
1318         .setup = i9xx_setup,
1319         .cleanup = i9xx_cleanup,
1320         .write_entry = i965_write_entry,
1321         .dma_mask_size = 36,
1322         .check_flags = i830_check_flags,
1323         .chipset_flush = i9xx_chipset_flush,
1324 };
1325 static const struct intel_gtt_driver ironlake_gtt_driver = {
1326         .gen = 5,
1327         .is_ironlake = 1,
1328         .setup = i9xx_setup,
1329         .cleanup = i9xx_cleanup,
1330         .write_entry = i965_write_entry,
1331         .dma_mask_size = 36,
1332         .check_flags = i830_check_flags,
1333         .chipset_flush = i9xx_chipset_flush,
1334 };
1335 static const struct intel_gtt_driver sandybridge_gtt_driver = {
1336         .gen = 6,
1337         .setup = i9xx_setup,
1338         .cleanup = gen6_cleanup,
1339         .write_entry = gen6_write_entry,
1340         .dma_mask_size = 40,
1341         .check_flags = gen6_check_flags,
1342         .chipset_flush = i9xx_chipset_flush,
1343 };
1344
1345 /* Table to describe Intel GMCH and AGP/PCIE GART drivers.  At least one of
1346  * driver and gmch_driver must be non-null, and find_gmch will determine
1347  * which one should be used if a gmch_chip_id is present.
1348  */
1349 static const struct intel_gtt_driver_description {
1350         unsigned int gmch_chip_id;
1351         char *name;
1352         const struct intel_gtt_driver *gtt_driver;
1353 } intel_gtt_chipsets[] = {
1354         { PCI_DEVICE_ID_INTEL_82810_IG1, "i810",
1355                 &i81x_gtt_driver},
1356         { PCI_DEVICE_ID_INTEL_82810_IG3, "i810",
1357                 &i81x_gtt_driver},
1358         { PCI_DEVICE_ID_INTEL_82810E_IG, "i810",
1359                 &i81x_gtt_driver},
1360         { PCI_DEVICE_ID_INTEL_82815_CGC, "i815",
1361                 &i81x_gtt_driver},
1362         { PCI_DEVICE_ID_INTEL_82830_CGC, "830M",
1363                 &i8xx_gtt_driver},
1364         { PCI_DEVICE_ID_INTEL_82845G_IG, "845G",
1365                 &i8xx_gtt_driver},
1366         { PCI_DEVICE_ID_INTEL_82854_IG, "854",
1367                 &i8xx_gtt_driver},
1368         { PCI_DEVICE_ID_INTEL_82855GM_IG, "855GM",
1369                 &i8xx_gtt_driver},
1370         { PCI_DEVICE_ID_INTEL_82865_IG, "865",
1371                 &i8xx_gtt_driver},
1372         { PCI_DEVICE_ID_INTEL_E7221_IG, "E7221 (i915)",
1373                 &i915_gtt_driver },
1374         { PCI_DEVICE_ID_INTEL_82915G_IG, "915G",
1375                 &i915_gtt_driver },
1376         { PCI_DEVICE_ID_INTEL_82915GM_IG, "915GM",
1377                 &i915_gtt_driver },
1378         { PCI_DEVICE_ID_INTEL_82945G_IG, "945G",
1379                 &i915_gtt_driver },
1380         { PCI_DEVICE_ID_INTEL_82945GM_IG, "945GM",
1381                 &i915_gtt_driver },
1382         { PCI_DEVICE_ID_INTEL_82945GME_IG, "945GME",
1383                 &i915_gtt_driver },
1384         { PCI_DEVICE_ID_INTEL_82946GZ_IG, "946GZ",
1385                 &i965_gtt_driver },
1386         { PCI_DEVICE_ID_INTEL_82G35_IG, "G35",
1387                 &i965_gtt_driver },
1388         { PCI_DEVICE_ID_INTEL_82965Q_IG, "965Q",
1389                 &i965_gtt_driver },
1390         { PCI_DEVICE_ID_INTEL_82965G_IG, "965G",
1391                 &i965_gtt_driver },
1392         { PCI_DEVICE_ID_INTEL_82965GM_IG, "965GM",
1393                 &i965_gtt_driver },
1394         { PCI_DEVICE_ID_INTEL_82965GME_IG, "965GME/GLE",
1395                 &i965_gtt_driver },
1396         { PCI_DEVICE_ID_INTEL_G33_IG, "G33",
1397                 &g33_gtt_driver },
1398         { PCI_DEVICE_ID_INTEL_Q35_IG, "Q35",
1399                 &g33_gtt_driver },
1400         { PCI_DEVICE_ID_INTEL_Q33_IG, "Q33",
1401                 &g33_gtt_driver },
1402         { PCI_DEVICE_ID_INTEL_PINEVIEW_M_IG, "GMA3150",
1403                 &pineview_gtt_driver },
1404         { PCI_DEVICE_ID_INTEL_PINEVIEW_IG, "GMA3150",
1405                 &pineview_gtt_driver },
1406         { PCI_DEVICE_ID_INTEL_GM45_IG, "GM45",
1407                 &g4x_gtt_driver },
1408         { PCI_DEVICE_ID_INTEL_EAGLELAKE_IG, "Eaglelake",
1409                 &g4x_gtt_driver },
1410         { PCI_DEVICE_ID_INTEL_Q45_IG, "Q45/Q43",
1411                 &g4x_gtt_driver },
1412         { PCI_DEVICE_ID_INTEL_G45_IG, "G45/G43",
1413                 &g4x_gtt_driver },
1414         { PCI_DEVICE_ID_INTEL_B43_IG, "B43",
1415                 &g4x_gtt_driver },
1416         { PCI_DEVICE_ID_INTEL_B43_1_IG, "B43",
1417                 &g4x_gtt_driver },
1418         { PCI_DEVICE_ID_INTEL_G41_IG, "G41",
1419                 &g4x_gtt_driver },
1420         { PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG,
1421             "HD Graphics", &ironlake_gtt_driver },
1422         { PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG,
1423             "HD Graphics", &ironlake_gtt_driver },
1424         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_GT1_IG,
1425             "Sandybridge", &sandybridge_gtt_driver },
1426         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_GT2_IG,
1427             "Sandybridge", &sandybridge_gtt_driver },
1428         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_GT2_PLUS_IG,
1429             "Sandybridge", &sandybridge_gtt_driver },
1430         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_M_GT1_IG,
1431             "Sandybridge", &sandybridge_gtt_driver },
1432         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_M_GT2_IG,
1433             "Sandybridge", &sandybridge_gtt_driver },
1434         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_M_GT2_PLUS_IG,
1435             "Sandybridge", &sandybridge_gtt_driver },
1436         { PCI_DEVICE_ID_INTEL_SANDYBRIDGE_S_IG,
1437             "Sandybridge", &sandybridge_gtt_driver },
1438         { 0, NULL, NULL }
1439 };
1440
1441 static int find_gmch(u16 device)
1442 {
1443         struct pci_dev *gmch_device;
1444
1445         gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL, device, NULL);
1446         if (gmch_device && PCI_FUNC(gmch_device->devfn) != 0) {
1447                 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL,
1448                                              device, gmch_device);
1449         }
1450
1451         if (!gmch_device)
1452                 return 0;
1453
1454         intel_private.pcidev = gmch_device;
1455         return 1;
1456 }
1457
1458 int intel_gmch_probe(struct pci_dev *pdev,
1459                                       struct agp_bridge_data *bridge)
1460 {
1461         int i, mask;
1462         intel_private.driver = NULL;
1463
1464         for (i = 0; intel_gtt_chipsets[i].name != NULL; i++) {
1465                 if (find_gmch(intel_gtt_chipsets[i].gmch_chip_id)) {
1466                         intel_private.driver =
1467                                 intel_gtt_chipsets[i].gtt_driver;
1468                         break;
1469                 }
1470         }
1471
1472         if (!intel_private.driver)
1473                 return 0;
1474
1475         bridge->driver = &intel_fake_agp_driver;
1476         bridge->dev_private_data = &intel_private;
1477         bridge->dev = pdev;
1478
1479         intel_private.bridge_dev = pci_dev_get(pdev);
1480
1481         dev_info(&pdev->dev, "Intel %s Chipset\n", intel_gtt_chipsets[i].name);
1482
1483         mask = intel_private.driver->dma_mask_size;
1484         if (pci_set_dma_mask(intel_private.pcidev, DMA_BIT_MASK(mask)))
1485                 dev_err(&intel_private.pcidev->dev,
1486                         "set gfx device dma mask %d-bit failed!\n", mask);
1487         else
1488                 pci_set_consistent_dma_mask(intel_private.pcidev,
1489                                             DMA_BIT_MASK(mask));
1490
1491         /*if (bridge->driver == &intel_810_driver)
1492                 return 1;*/
1493
1494         if (intel_gtt_init() != 0)
1495                 return 0;
1496
1497         return 1;
1498 }
1499 EXPORT_SYMBOL(intel_gmch_probe);
1500
1501 const struct intel_gtt *intel_gtt_get(void)
1502 {
1503         return &intel_private.base;
1504 }
1505 EXPORT_SYMBOL(intel_gtt_get);
1506
1507 void intel_gtt_chipset_flush(void)
1508 {
1509         if (intel_private.driver->chipset_flush)
1510                 intel_private.driver->chipset_flush();
1511 }
1512 EXPORT_SYMBOL(intel_gtt_chipset_flush);
1513
1514 void intel_gmch_remove(struct pci_dev *pdev)
1515 {
1516         if (intel_private.pcidev)
1517                 pci_dev_put(intel_private.pcidev);
1518         if (intel_private.bridge_dev)
1519                 pci_dev_put(intel_private.bridge_dev);
1520 }
1521 EXPORT_SYMBOL(intel_gmch_remove);
1522
1523 MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
1524 MODULE_LICENSE("GPL and additional rights");