drivers/char/agp/intel-gtt.c

   1 /*
   2  * Intel GTT (Graphics Translation Table) routines
   3  *
   4  * Caveat: This driver implements the linux agp interface, but this is far from
   5  * a agp driver! GTT support ended up here for purely historical reasons: The
   6  * old userspace intel graphics drivers needed an interface to map memory into
   7  * the GTT. And the drm provides a default interface for graphic devices sitting
   8  * on an agp port. So it made sense to fake the GTT support as an agp port to
   9  * avoid having to create a new api.
  10  *
  11  * With gem this does not make much sense anymore, just needlessly complicates
  12  * the code. But as long as the old graphics stack is still support, it's stuck
  13  * here.
  14  *
  15  * /fairy-tale-mode off
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/pci.h>
  20 #include <linux/kernel.h>
  21 #include <linux/pagemap.h>
  22 #include <linux/agp_backend.h>
  23 #include <linux/delay.h>
  24 #include <asm/smp.h>
  25 #include "agp.h"
  26 #include "intel-agp.h"
  27 #include <drm/intel-gtt.h>
  28 #include <asm/set_memory.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         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_phys_addr;
  68         u32 PGETBL_save;
  69         u32 __iomem *gtt;               /* I915G */
  70         bool clear_fake_agp; /* on first access via agp, fill with scratch */
  71         int num_dcache_entries;
  72         void __iomem *i9xx_flush_page;
  73         char *i81x_gtt_table;
  74         struct resource ifp_resource;
  75         int resource_valid;
  76         struct page *scratch_page;
  77         phys_addr_t scratch_page_dma;
  78         int refcount;
  79         /* Whether i915 needs to use the dmar apis or not. */
  80         unsigned int needs_dmar : 1;
  81         phys_addr_t gma_bus_addr;
  82         /*  Size of memory reserved for graphics by the BIOS */
  83         unsigned int stolen_size;
  84         /* Total number of gtt entries. */
  85         unsigned int gtt_total_entries;
  86         /* Part of the gtt that is mappable by the cpu, for those chips where
  87          * this is not the full gtt. */
  88         unsigned int gtt_mappable_entries;
  89 } intel_private;
  90
  91 #define INTEL_GTT_GEN   intel_private.driver->gen
  92 #define IS_G33          intel_private.driver->is_g33
  93 #define IS_PINEVIEW     intel_private.driver->is_pineview
  94 #define IS_IRONLAKE     intel_private.driver->is_ironlake
  95 #define HAS_PGTBL_EN    intel_private.driver->has_pgtbl_enable
  96
  97 #if IS_ENABLED(CONFIG_AGP_INTEL)
  98 static int intel_gtt_map_memory(struct page **pages,
  99                                 unsigned int num_entries,
 100                                 struct sg_table *st)
 101 {
 102         struct scatterlist *sg;
 103         int i;
 104
 105         DBG("try mapping %lu pages\n", (unsigned long)num_entries);
 106
 107         if (sg_alloc_table(st, num_entries, GFP_KERNEL))
 108                 goto err;
 109
 110         for_each_sg(st->sgl, sg, num_entries, i)
 111                 sg_set_page(sg, pages[i], PAGE_SIZE, 0);
 112
 113         if (!pci_map_sg(intel_private.pcidev,
 114                         st->sgl, st->nents, PCI_DMA_BIDIRECTIONAL))
 115                 goto err;
 116
 117         return 0;
 118
 119 err:
 120         sg_free_table(st);
 121         return -ENOMEM;
 122 }
 123
 124 static void intel_gtt_unmap_memory(struct scatterlist *sg_list, int num_sg)
 125 {
 126         struct sg_table st;
 127         DBG("try unmapping %lu pages\n", (unsigned long)mem->page_count);
 128
 129         pci_unmap_sg(intel_private.pcidev, sg_list,
 130                      num_sg, PCI_DMA_BIDIRECTIONAL);
 131
 132         st.sgl = sg_list;
 133         st.orig_nents = st.nents = num_sg;
 134
 135         sg_free_table(&st);
 136 }
 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         atomic_inc(&agp_bridge->current_memory_agp);
 158         return page;
 159 }
 160
 161 static void i8xx_destroy_pages(struct page *page)
 162 {
 163         if (page == NULL)
 164                 return;
 165
 166         set_pages_wb(page, 4);
 167         __free_pages(page, 2);
 168         atomic_dec(&agp_bridge->current_memory_agp);
 169 }
 170 #endif
 171
 172 #define I810_GTT_ORDER 4
 173 static int i810_setup(void)
 174 {
 175         phys_addr_t reg_addr;
 176         char *gtt_table;
 177
 178         /* i81x does not preallocate the gtt. It's always 64kb in size. */
 179         gtt_table = alloc_gatt_pages(I810_GTT_ORDER);
 180         if (gtt_table == NULL)
 181                 return -ENOMEM;
 182         intel_private.i81x_gtt_table = gtt_table;
 183
 184         reg_addr = pci_resource_start(intel_private.pcidev, I810_MMADR_BAR);
 185
 186         intel_private.registers = ioremap(reg_addr, KB(64));
 187         if (!intel_private.registers)
 188                 return -ENOMEM;
 189
 190         writel(virt_to_phys(gtt_table) | I810_PGETBL_ENABLED,
 191                intel_private.registers+I810_PGETBL_CTL);
 192
 193         intel_private.gtt_phys_addr = reg_addr + I810_PTE_BASE;
 194
 195         if ((readl(intel_private.registers+I810_DRAM_CTL)
 196                 & I810_DRAM_ROW_0) == I810_DRAM_ROW_0_SDRAM) {
 197                 dev_info(&intel_private.pcidev->dev,
 198                          "detected 4MB dedicated video ram\n");
 199                 intel_private.num_dcache_entries = 1024;
 200         }
 201
 202         return 0;
 203 }
 204
 205 static void i810_cleanup(void)
 206 {
 207         writel(0, intel_private.registers+I810_PGETBL_CTL);
 208         free_gatt_pages(intel_private.i81x_gtt_table, I810_GTT_ORDER);
 209 }
 210
 211 #if IS_ENABLED(CONFIG_AGP_INTEL)
 212 static int i810_insert_dcache_entries(struct agp_memory *mem, off_t pg_start,
 213                                       int type)
 214 {
 215         int i;
 216
 217         if ((pg_start + mem->page_count)
 218                         > intel_private.num_dcache_entries)
 219                 return -EINVAL;
 220
 221         if (!mem->is_flushed)
 222                 global_cache_flush();
 223
 224         for (i = pg_start; i < (pg_start + mem->page_count); i++) {
 225                 dma_addr_t addr = i << PAGE_SHIFT;
 226                 intel_private.driver->write_entry(addr,
 227                                                   i, type);
 228         }
 229         wmb();
 230
 231         return 0;
 232 }
 233
 234 /*
 235  * The i810/i830 requires a physical address to program its mouse
 236  * pointer into hardware.
 237  * However the Xserver still writes to it through the agp aperture.
 238  */
 239 static struct agp_memory *alloc_agpphysmem_i8xx(size_t pg_count, int type)
 240 {
 241         struct agp_memory *new;
 242         struct page *page;
 243
 244         switch (pg_count) {
 245         case 1: page = agp_bridge->driver->agp_alloc_page(agp_bridge);
 246                 break;
 247         case 4:
 248                 /* kludge to get 4 physical pages for ARGB cursor */
 249                 page = i8xx_alloc_pages();
 250                 break;
 251         default:
 252                 return NULL;
 253         }
 254
 255         if (page == NULL)
 256                 return NULL;
 257
 258         new = agp_create_memory(pg_count);
 259         if (new == NULL)
 260                 return NULL;
 261
 262         new->pages[0] = page;
 263         if (pg_count == 4) {
 264                 /* kludge to get 4 physical pages for ARGB cursor */
 265                 new->pages[1] = new->pages[0] + 1;
 266                 new->pages[2] = new->pages[1] + 1;
 267                 new->pages[3] = new->pages[2] + 1;
 268         }
 269         new->page_count = pg_count;
 270         new->num_scratch_pages = pg_count;
 271         new->type = AGP_PHYS_MEMORY;
 272         new->physical = page_to_phys(new->pages[0]);
 273         return new;
 274 }
 275
 276 static void intel_i810_free_by_type(struct agp_memory *curr)
 277 {
 278         agp_free_key(curr->key);
 279         if (curr->type == AGP_PHYS_MEMORY) {
 280                 if (curr->page_count == 4)
 281                         i8xx_destroy_pages(curr->pages[0]);
 282                 else {
 283                         agp_bridge->driver->agp_destroy_page(curr->pages[0],
 284                                                              AGP_PAGE_DESTROY_UNMAP);
 285                         agp_bridge->driver->agp_destroy_page(curr->pages[0],
 286                                                              AGP_PAGE_DESTROY_FREE);
 287                 }
 288                 agp_free_page_array(curr);
 289         }
 290         kfree(curr);
 291 }
 292 #endif
 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         set_pages_uc(page, 1);
 303
 304         if (intel_private.needs_dmar) {
 305                 dma_addr = pci_map_page(intel_private.pcidev, page, 0,
 306                                     PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 307                 if (pci_dma_mapping_error(intel_private.pcidev, dma_addr))
 308                         return -EINVAL;
 309
 310                 intel_private.scratch_page_dma = dma_addr;
 311         } else
 312                 intel_private.scratch_page_dma = page_to_phys(page);
 313
 314         intel_private.scratch_page = page;
 315
 316         return 0;
 317 }
 318
 319 static void i810_write_entry(dma_addr_t addr, unsigned int entry,
 320                              unsigned int flags)
 321 {
 322         u32 pte_flags = I810_PTE_VALID;
 323
 324         switch (flags) {
 325         case AGP_DCACHE_MEMORY:
 326                 pte_flags |= I810_PTE_LOCAL;
 327                 break;
 328         case AGP_USER_CACHED_MEMORY:
 329                 pte_flags |= I830_PTE_SYSTEM_CACHED;
 330                 break;
 331         }
 332
 333         writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
 334 }
 335
 336 static unsigned int intel_gtt_stolen_size(void)
 337 {
 338         u16 gmch_ctrl;
 339         u8 rdct;
 340         int local = 0;
 341         static const int ddt[4] = { 0, 16, 32, 64 };
 342         unsigned int stolen_size = 0;
 343
 344         if (INTEL_GTT_GEN == 1)
 345                 return 0; /* no stolen mem on i81x */
 346
 347         pci_read_config_word(intel_private.bridge_dev,
 348                              I830_GMCH_CTRL, &gmch_ctrl);
 349
 350         if (intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82830_HB ||
 351             intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82845G_HB) {
 352                 switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
 353                 case I830_GMCH_GMS_STOLEN_512:
 354                         stolen_size = KB(512);
 355                         break;
 356                 case I830_GMCH_GMS_STOLEN_1024:
 357                         stolen_size = MB(1);
 358                         break;
 359                 case I830_GMCH_GMS_STOLEN_8192:
 360                         stolen_size = MB(8);
 361                         break;
 362                 case I830_GMCH_GMS_LOCAL:
 363                         rdct = readb(intel_private.registers+I830_RDRAM_CHANNEL_TYPE);
 364                         stolen_size = (I830_RDRAM_ND(rdct) + 1) *
 365                                         MB(ddt[I830_RDRAM_DDT(rdct)]);
 366                         local = 1;
 367                         break;
 368                 default:
 369                         stolen_size = 0;
 370                         break;
 371                 }
 372         } else {
 373                 switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
 374                 case I855_GMCH_GMS_STOLEN_1M:
 375                         stolen_size = MB(1);
 376                         break;
 377                 case I855_GMCH_GMS_STOLEN_4M:
 378                         stolen_size = MB(4);
 379                         break;
 380                 case I855_GMCH_GMS_STOLEN_8M:
 381                         stolen_size = MB(8);
 382                         break;
 383                 case I855_GMCH_GMS_STOLEN_16M:
 384                         stolen_size = MB(16);
 385                         break;
 386                 case I855_GMCH_GMS_STOLEN_32M:
 387                         stolen_size = MB(32);
 388                         break;
 389                 case I915_GMCH_GMS_STOLEN_48M:
 390                         stolen_size = MB(48);
 391                         break;
 392                 case I915_GMCH_GMS_STOLEN_64M:
 393                         stolen_size = MB(64);
 394                         break;
 395                 case G33_GMCH_GMS_STOLEN_128M:
 396                         stolen_size = MB(128);
 397                         break;
 398                 case G33_GMCH_GMS_STOLEN_256M:
 399                         stolen_size = MB(256);
 400                         break;
 401                 case INTEL_GMCH_GMS_STOLEN_96M:
 402                         stolen_size = MB(96);
 403                         break;
 404                 case INTEL_GMCH_GMS_STOLEN_160M:
 405                         stolen_size = MB(160);
 406                         break;
 407                 case INTEL_GMCH_GMS_STOLEN_224M:
 408                         stolen_size = MB(224);
 409                         break;
 410                 case INTEL_GMCH_GMS_STOLEN_352M:
 411                         stolen_size = MB(352);
 412                         break;
 413                 default:
 414                         stolen_size = 0;
 415                         break;
 416                 }
 417         }
 418
 419         if (stolen_size > 0) {
 420                 dev_info(&intel_private.bridge_dev->dev, "detected %dK %s memory\n",
 421                        stolen_size / KB(1), local ? "local" : "stolen");
 422         } else {
 423                 dev_info(&intel_private.bridge_dev->dev,
 424                        "no pre-allocated video memory detected\n");
 425                 stolen_size = 0;
 426         }
 427
 428         return stolen_size;
 429 }
 430
 431 static void i965_adjust_pgetbl_size(unsigned int size_flag)
 432 {
 433         u32 pgetbl_ctl, pgetbl_ctl2;
 434
 435         /* ensure that ppgtt is disabled */
 436         pgetbl_ctl2 = readl(intel_private.registers+I965_PGETBL_CTL2);
 437         pgetbl_ctl2 &= ~I810_PGETBL_ENABLED;
 438         writel(pgetbl_ctl2, intel_private.registers+I965_PGETBL_CTL2);
 439
 440         /* write the new ggtt size */
 441         pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
 442         pgetbl_ctl &= ~I965_PGETBL_SIZE_MASK;
 443         pgetbl_ctl |= size_flag;
 444         writel(pgetbl_ctl, intel_private.registers+I810_PGETBL_CTL);
 445 }
 446
 447 static unsigned int i965_gtt_total_entries(void)
 448 {
 449         int size;
 450         u32 pgetbl_ctl;
 451         u16 gmch_ctl;
 452
 453         pci_read_config_word(intel_private.bridge_dev,
 454                              I830_GMCH_CTRL, &gmch_ctl);
 455
 456         if (INTEL_GTT_GEN == 5) {
 457                 switch (gmch_ctl & G4x_GMCH_SIZE_MASK) {
 458                 case G4x_GMCH_SIZE_1M:
 459                 case G4x_GMCH_SIZE_VT_1M:
 460                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1MB);
 461                         break;
 462                 case G4x_GMCH_SIZE_VT_1_5M:
 463                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1_5MB);
 464                         break;
 465                 case G4x_GMCH_SIZE_2M:
 466                 case G4x_GMCH_SIZE_VT_2M:
 467                         i965_adjust_pgetbl_size(I965_PGETBL_SIZE_2MB);
 468                         break;
 469                 }
 470         }
 471
 472         pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL);
 473
 474         switch (pgetbl_ctl & I965_PGETBL_SIZE_MASK) {
 475         case I965_PGETBL_SIZE_128KB:
 476                 size = KB(128);
 477                 break;
 478         case I965_PGETBL_SIZE_256KB:
 479                 size = KB(256);
 480                 break;
 481         case I965_PGETBL_SIZE_512KB:
 482                 size = KB(512);
 483                 break;
 484         /* GTT pagetable sizes bigger than 512KB are not possible on G33! */
 485         case I965_PGETBL_SIZE_1MB:
 486                 size = KB(1024);
 487                 break;
 488         case I965_PGETBL_SIZE_2MB:
 489                 size = KB(2048);
 490                 break;
 491         case I965_PGETBL_SIZE_1_5MB:
 492                 size = KB(1024 + 512);
 493                 break;
 494         default:
 495                 dev_info(&intel_private.pcidev->dev,
 496                          "unknown page table size, assuming 512KB\n");
 497                 size = KB(512);
 498         }
 499
 500         return size/4;
 501 }
 502
 503 static unsigned int intel_gtt_total_entries(void)
 504 {
 505         if (IS_G33 || INTEL_GTT_GEN == 4 || INTEL_GTT_GEN == 5)
 506                 return i965_gtt_total_entries();
 507         else {
 508                 /* On previous hardware, the GTT size was just what was
 509                  * required to map the aperture.
 510                  */
 511                 return intel_private.gtt_mappable_entries;
 512         }
 513 }
 514
 515 static unsigned int intel_gtt_mappable_entries(void)
 516 {
 517         unsigned int aperture_size;
 518
 519         if (INTEL_GTT_GEN == 1) {
 520                 u32 smram_miscc;
 521
 522                 pci_read_config_dword(intel_private.bridge_dev,
 523                                       I810_SMRAM_MISCC, &smram_miscc);
 524
 525                 if ((smram_miscc & I810_GFX_MEM_WIN_SIZE)
 526                                 == I810_GFX_MEM_WIN_32M)
 527                         aperture_size = MB(32);
 528                 else
 529                         aperture_size = MB(64);
 530         } else if (INTEL_GTT_GEN == 2) {
 531                 u16 gmch_ctrl;
 532
 533                 pci_read_config_word(intel_private.bridge_dev,
 534                                      I830_GMCH_CTRL, &gmch_ctrl);
 535
 536                 if ((gmch_ctrl & I830_GMCH_MEM_MASK) == I830_GMCH_MEM_64M)
 537                         aperture_size = MB(64);
 538                 else
 539                         aperture_size = MB(128);
 540         } else {
 541                 /* 9xx supports large sizes, just look at the length */
 542                 aperture_size = pci_resource_len(intel_private.pcidev, 2);
 543         }
 544
 545         return aperture_size >> PAGE_SHIFT;
 546 }
 547
 548 static void intel_gtt_teardown_scratch_page(void)
 549 {
 550         set_pages_wb(intel_private.scratch_page, 1);
 551         if (intel_private.needs_dmar)
 552                 pci_unmap_page(intel_private.pcidev,
 553                                intel_private.scratch_page_dma,
 554                                PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 555         __free_page(intel_private.scratch_page);
 556 }
 557
 558 static void intel_gtt_cleanup(void)
 559 {
 560         intel_private.driver->cleanup();
 561
 562         iounmap(intel_private.gtt);
 563         iounmap(intel_private.registers);
 564
 565         intel_gtt_teardown_scratch_page();
 566 }
 567
 568 /* Certain Gen5 chipsets require require idling the GPU before
 569  * unmapping anything from the GTT when VT-d is enabled.
 570  */
 571 static inline int needs_ilk_vtd_wa(void)
 572 {
 573 #ifdef CONFIG_INTEL_IOMMU
 574         const unsigned short gpu_devid = intel_private.pcidev->device;
 575
 576         /* Query intel_iommu to see if we need the workaround. Presumably that
 577          * was loaded first.
 578          */
 579         if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG ||
 580              gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
 581              intel_iommu_gfx_mapped)
 582                 return 1;
 583 #endif
 584         return 0;
 585 }
 586
 587 static bool intel_gtt_can_wc(void)
 588 {
 589         if (INTEL_GTT_GEN <= 2)
 590                 return false;
 591
 592         if (INTEL_GTT_GEN >= 6)
 593                 return false;
 594
 595         /* Reports of major corruption with ILK vt'd enabled */
 596         if (needs_ilk_vtd_wa())
 597                 return false;
 598
 599         return true;
 600 }
 601
 602 static int intel_gtt_init(void)
 603 {
 604         u32 gtt_map_size;
 605         int ret, bar;
 606
 607         ret = intel_private.driver->setup();
 608         if (ret != 0)
 609                 return ret;
 610
 611         intel_private.gtt_mappable_entries = intel_gtt_mappable_entries();
 612         intel_private.gtt_total_entries = intel_gtt_total_entries();
 613
 614         /* save the PGETBL reg for resume */
 615         intel_private.PGETBL_save =
 616                 readl(intel_private.registers+I810_PGETBL_CTL)
 617                         & ~I810_PGETBL_ENABLED;
 618         /* we only ever restore the register when enabling the PGTBL... */
 619         if (HAS_PGTBL_EN)
 620                 intel_private.PGETBL_save |= I810_PGETBL_ENABLED;
 621
 622         dev_info(&intel_private.bridge_dev->dev,
 623                         "detected gtt size: %dK total, %dK mappable\n",
 624                         intel_private.gtt_total_entries * 4,
 625                         intel_private.gtt_mappable_entries * 4);
 626
 627         gtt_map_size = intel_private.gtt_total_entries * 4;
 628
 629         intel_private.gtt = NULL;
 630         if (intel_gtt_can_wc())
 631                 intel_private.gtt = ioremap_wc(intel_private.gtt_phys_addr,
 632                                                gtt_map_size);
 633         if (intel_private.gtt == NULL)
 634                 intel_private.gtt = ioremap(intel_private.gtt_phys_addr,
 635                                             gtt_map_size);
 636         if (intel_private.gtt == NULL) {
 637                 intel_private.driver->cleanup();
 638                 iounmap(intel_private.registers);
 639                 return -ENOMEM;
 640         }
 641
 642 #if IS_ENABLED(CONFIG_AGP_INTEL)
 643         global_cache_flush();   /* FIXME: ? */
 644 #endif
 645
 646         intel_private.stolen_size = intel_gtt_stolen_size();
 647
 648         intel_private.needs_dmar = USE_PCI_DMA_API && INTEL_GTT_GEN > 2;
 649
 650         ret = intel_gtt_setup_scratch_page();
 651         if (ret != 0) {
 652                 intel_gtt_cleanup();
 653                 return ret;
 654         }
 655
 656         if (INTEL_GTT_GEN <= 2)
 657                 bar = I810_GMADR_BAR;
 658         else
 659                 bar = I915_GMADR_BAR;
 660
 661         intel_private.gma_bus_addr = pci_bus_address(intel_private.pcidev, bar);
 662         return 0;
 663 }
 664
 665 #if IS_ENABLED(CONFIG_AGP_INTEL)
 666 static const struct aper_size_info_fixed intel_fake_agp_sizes[] = {
 667         {32, 8192, 3},
 668         {64, 16384, 4},
 669         {128, 32768, 5},
 670         {256, 65536, 6},
 671         {512, 131072, 7},
 672 };
 673
 674 static int intel_fake_agp_fetch_size(void)
 675 {
 676         int num_sizes = ARRAY_SIZE(intel_fake_agp_sizes);
 677         unsigned int aper_size;
 678         int i;
 679
 680         aper_size = (intel_private.gtt_mappable_entries << PAGE_SHIFT) / MB(1);
 681
 682         for (i = 0; i < num_sizes; i++) {
 683                 if (aper_size == intel_fake_agp_sizes[i].size) {
 684                         agp_bridge->current_size =
 685                                 (void *) (intel_fake_agp_sizes + i);
 686                         return aper_size;
 687                 }
 688         }
 689
 690         return 0;
 691 }
 692 #endif
 693
 694 static void i830_cleanup(void)
 695 {
 696 }
 697
 698 /* The chipset_flush interface needs to get data that has already been
 699  * flushed out of the CPU all the way out to main memory, because the GPU
 700  * doesn't snoop those buffers.
 701  *
 702  * The 8xx series doesn't have the same lovely interface for flushing the
 703  * chipset write buffers that the later chips do. According to the 865
 704  * specs, it's 64 octwords, or 1KB.  So, to get those previous things in
 705  * that buffer out, we just fill 1KB and clflush it out, on the assumption
 706  * that it'll push whatever was in there out.  It appears to work.
 707  */
 708 static void i830_chipset_flush(void)
 709 {
 710         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 711
 712         /* Forcibly evict everything from the CPU write buffers.
 713          * clflush appears to be insufficient.
 714          */
 715         wbinvd_on_all_cpus();
 716
 717         /* Now we've only seen documents for this magic bit on 855GM,
 718          * we hope it exists for the other gen2 chipsets...
 719          *
 720          * Also works as advertised on my 845G.
 721          */
 722         writel(readl(intel_private.registers+I830_HIC) | (1<<31),
 723                intel_private.registers+I830_HIC);
 724
 725         while (readl(intel_private.registers+I830_HIC) & (1<<31)) {
 726                 if (time_after(jiffies, timeout))
 727                         break;
 728
 729                 udelay(50);
 730         }
 731 }
 732
 733 static void i830_write_entry(dma_addr_t addr, unsigned int entry,
 734                              unsigned int flags)
 735 {
 736         u32 pte_flags = I810_PTE_VALID;
 737
 738         if (flags ==  AGP_USER_CACHED_MEMORY)
 739                 pte_flags |= I830_PTE_SYSTEM_CACHED;
 740
 741         writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
 742 }
 743
 744 bool intel_enable_gtt(void)
 745 {
 746         u8 __iomem *reg;
 747
 748         if (INTEL_GTT_GEN == 2) {
 749                 u16 gmch_ctrl;
 750
 751                 pci_read_config_word(intel_private.bridge_dev,
 752                                      I830_GMCH_CTRL, &gmch_ctrl);
 753                 gmch_ctrl |= I830_GMCH_ENABLED;
 754                 pci_write_config_word(intel_private.bridge_dev,
 755                                       I830_GMCH_CTRL, gmch_ctrl);
 756
 757                 pci_read_config_word(intel_private.bridge_dev,
 758                                      I830_GMCH_CTRL, &gmch_ctrl);
 759                 if ((gmch_ctrl & I830_GMCH_ENABLED) == 0) {
 760                         dev_err(&intel_private.pcidev->dev,
 761                                 "failed to enable the GTT: GMCH_CTRL=%x\n",
 762                                 gmch_ctrl);
 763                         return false;
 764                 }
 765         }
 766
 767         /* On the resume path we may be adjusting the PGTBL value, so
 768          * be paranoid and flush all chipset write buffers...
 769          */
 770         if (INTEL_GTT_GEN >= 3)
 771                 writel(0, intel_private.registers+GFX_FLSH_CNTL);
 772
 773         reg = intel_private.registers+I810_PGETBL_CTL;
 774         writel(intel_private.PGETBL_save, reg);
 775         if (HAS_PGTBL_EN && (readl(reg) & I810_PGETBL_ENABLED) == 0) {
 776                 dev_err(&intel_private.pcidev->dev,
 777                         "failed to enable the GTT: PGETBL=%x [expected %x]\n",
 778                         readl(reg), intel_private.PGETBL_save);
 779                 return false;
 780         }
 781
 782         if (INTEL_GTT_GEN >= 3)
 783                 writel(0, intel_private.registers+GFX_FLSH_CNTL);
 784
 785         return true;
 786 }
 787 EXPORT_SYMBOL(intel_enable_gtt);
 788
 789 static int i830_setup(void)
 790 {
 791         phys_addr_t reg_addr;
 792
 793         reg_addr = pci_resource_start(intel_private.pcidev, I810_MMADR_BAR);
 794
 795         intel_private.registers = ioremap(reg_addr, KB(64));
 796         if (!intel_private.registers)
 797                 return -ENOMEM;
 798
 799         intel_private.gtt_phys_addr = reg_addr + I810_PTE_BASE;
 800
 801         return 0;
 802 }
 803
 804 #if IS_ENABLED(CONFIG_AGP_INTEL)
 805 static int intel_fake_agp_create_gatt_table(struct agp_bridge_data *bridge)
 806 {
 807         agp_bridge->gatt_table_real = NULL;
 808         agp_bridge->gatt_table = NULL;
 809         agp_bridge->gatt_bus_addr = 0;
 810
 811         return 0;
 812 }
 813
 814 static int intel_fake_agp_free_gatt_table(struct agp_bridge_data *bridge)
 815 {
 816         return 0;
 817 }
 818
 819 static int intel_fake_agp_configure(void)
 820 {
 821         if (!intel_enable_gtt())
 822             return -EIO;
 823
 824         intel_private.clear_fake_agp = true;
 825         agp_bridge->gart_bus_addr = intel_private.gma_bus_addr;
 826
 827         return 0;
 828 }
 829 #endif
 830
 831 static bool i830_check_flags(unsigned int flags)
 832 {
 833         switch (flags) {
 834         case 0:
 835         case AGP_PHYS_MEMORY:
 836         case AGP_USER_CACHED_MEMORY:
 837         case AGP_USER_MEMORY:
 838                 return true;
 839         }
 840
 841         return false;
 842 }
 843
 844 void intel_gtt_insert_page(dma_addr_t addr,
 845                            unsigned int pg,
 846                            unsigned int flags)
 847 {
 848         intel_private.driver->write_entry(addr, pg, flags);
 849         if (intel_private.driver->chipset_flush)
 850                 intel_private.driver->chipset_flush();
 851 }
 852 EXPORT_SYMBOL(intel_gtt_insert_page);
 853
 854 void intel_gtt_insert_sg_entries(struct sg_table *st,
 855                                  unsigned int pg_start,
 856                                  unsigned int flags)
 857 {
 858         struct scatterlist *sg;
 859         unsigned int len, m;
 860         int i, j;
 861
 862         j = pg_start;
 863
 864         /* sg may merge pages, but we have to separate
 865          * per-page addr for GTT */
 866         for_each_sg(st->sgl, sg, st->nents, i) {
 867                 len = sg_dma_len(sg) >> PAGE_SHIFT;
 868                 for (m = 0; m < len; m++) {
 869                         dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
 870                         intel_private.driver->write_entry(addr, j, flags);
 871                         j++;
 872                 }
 873         }
 874         wmb();
 875 }
 876 EXPORT_SYMBOL(intel_gtt_insert_sg_entries);
 877
 878 #if IS_ENABLED(CONFIG_AGP_INTEL)
 879 static void intel_gtt_insert_pages(unsigned int first_entry,
 880                                    unsigned int num_entries,
 881                                    struct page **pages,
 882                                    unsigned int flags)
 883 {
 884         int i, j;
 885
 886         for (i = 0, j = first_entry; i < num_entries; i++, j++) {
 887                 dma_addr_t addr = page_to_phys(pages[i]);
 888                 intel_private.driver->write_entry(addr,
 889                                                   j, flags);
 890         }
 891         wmb();
 892 }
 893
 894 static int intel_fake_agp_insert_entries(struct agp_memory *mem,
 895                                          off_t pg_start, int type)
 896 {
 897         int ret = -EINVAL;
 898
 899         if (intel_private.clear_fake_agp) {
 900                 int start = intel_private.stolen_size / PAGE_SIZE;
 901                 int end = intel_private.gtt_mappable_entries;
 902                 intel_gtt_clear_range(start, end - start);
 903                 intel_private.clear_fake_agp = false;
 904         }
 905
 906         if (INTEL_GTT_GEN == 1 && type == AGP_DCACHE_MEMORY)
 907                 return i810_insert_dcache_entries(mem, pg_start, type);
 908
 909         if (mem->page_count == 0)
 910                 goto out;
 911
 912         if (pg_start + mem->page_count > intel_private.gtt_total_entries)
 913                 goto out_err;
 914
 915         if (type != mem->type)
 916                 goto out_err;
 917
 918         if (!intel_private.driver->check_flags(type))
 919                 goto out_err;
 920
 921         if (!mem->is_flushed)
 922                 global_cache_flush();
 923
 924         if (intel_private.needs_dmar) {
 925                 struct sg_table st;
 926
 927                 ret = intel_gtt_map_memory(mem->pages, mem->page_count, &st);
 928                 if (ret != 0)
 929                         return ret;
 930
 931                 intel_gtt_insert_sg_entries(&st, pg_start, type);
 932                 mem->sg_list = st.sgl;
 933                 mem->num_sg = st.nents;
 934         } else
 935                 intel_gtt_insert_pages(pg_start, mem->page_count, mem->pages,
 936                                        type);
 937
 938 out:
 939         ret = 0;
 940 out_err:
 941         mem->is_flushed = true;
 942         return ret;
 943 }
 944 #endif
 945
 946 void intel_gtt_clear_range(unsigned int first_entry, unsigned int num_entries)
 947 {
 948         unsigned int i;
 949
 950         for (i = first_entry; i < (first_entry + num_entries); i++) {
 951                 intel_private.driver->write_entry(intel_private.scratch_page_dma,
 952                                                   i, 0);
 953         }
 954         wmb();
 955 }
 956 EXPORT_SYMBOL(intel_gtt_clear_range);
 957
 958 #if IS_ENABLED(CONFIG_AGP_INTEL)
 959 static int intel_fake_agp_remove_entries(struct agp_memory *mem,
 960                                          off_t pg_start, int type)
 961 {
 962         if (mem->page_count == 0)
 963                 return 0;
 964
 965         intel_gtt_clear_range(pg_start, mem->page_count);
 966
 967         if (intel_private.needs_dmar) {
 968                 intel_gtt_unmap_memory(mem->sg_list, mem->num_sg);
 969                 mem->sg_list = NULL;
 970                 mem->num_sg = 0;
 971         }
 972
 973         return 0;
 974 }
 975
 976 static struct agp_memory *intel_fake_agp_alloc_by_type(size_t pg_count,
 977                                                        int type)
 978 {
 979         struct agp_memory *new;
 980
 981         if (type == AGP_DCACHE_MEMORY && INTEL_GTT_GEN == 1) {
 982                 if (pg_count != intel_private.num_dcache_entries)
 983                         return NULL;
 984
 985                 new = agp_create_memory(1);
 986                 if (new == NULL)
 987                         return NULL;
 988
 989                 new->type = AGP_DCACHE_MEMORY;
 990                 new->page_count = pg_count;
 991                 new->num_scratch_pages = 0;
 992                 agp_free_page_array(new);
 993                 return new;
 994         }
 995         if (type == AGP_PHYS_MEMORY)
 996                 return alloc_agpphysmem_i8xx(pg_count, type);
 997         /* always return NULL for other allocation types for now */
 998         return NULL;
 999 }
1000 #endif
1001
1002 static int intel_alloc_chipset_flush_resource(void)
1003 {
1004         int ret;
1005         ret = pci_bus_alloc_resource(intel_private.bridge_dev->bus, &intel_private.ifp_resource, PAGE_SIZE,
1006                                      PAGE_SIZE, PCIBIOS_MIN_MEM, 0,
1007                                      pcibios_align_resource, intel_private.bridge_dev);
1008
1009         return ret;
1010 }
1011
1012 static void intel_i915_setup_chipset_flush(void)
1013 {
1014         int ret;
1015         u32 temp;
1016
1017         pci_read_config_dword(intel_private.bridge_dev, I915_IFPADDR, &temp);
1018         if (!(temp & 0x1)) {
1019                 intel_alloc_chipset_flush_resource();
1020                 intel_private.resource_valid = 1;
1021                 pci_write_config_dword(intel_private.bridge_dev, I915_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1022         } else {
1023                 temp &= ~1;
1024
1025                 intel_private.resource_valid = 1;
1026                 intel_private.ifp_resource.start = temp;
1027                 intel_private.ifp_resource.end = temp + PAGE_SIZE;
1028                 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1029                 /* some BIOSes reserve this area in a pnp some don't */
1030                 if (ret)
1031                         intel_private.resource_valid = 0;
1032         }
1033 }
1034
1035 static void intel_i965_g33_setup_chipset_flush(void)
1036 {
1037         u32 temp_hi, temp_lo;
1038         int ret;
1039
1040         pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4, &temp_hi);
1041         pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR, &temp_lo);
1042
1043         if (!(temp_lo & 0x1)) {
1044
1045                 intel_alloc_chipset_flush_resource();
1046
1047                 intel_private.resource_valid = 1;
1048                 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4,
1049                         upper_32_bits(intel_private.ifp_resource.start));
1050                 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
1051         } else {
1052                 u64 l64;
1053
1054                 temp_lo &= ~0x1;
1055                 l64 = ((u64)temp_hi << 32) | temp_lo;
1056
1057                 intel_private.resource_valid = 1;
1058                 intel_private.ifp_resource.start = l64;
1059                 intel_private.ifp_resource.end = l64 + PAGE_SIZE;
1060                 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
1061                 /* some BIOSes reserve this area in a pnp some don't */
1062                 if (ret)
1063                         intel_private.resource_valid = 0;
1064         }
1065 }
1066
1067 static void intel_i9xx_setup_flush(void)
1068 {
1069         /* return if already configured */
1070         if (intel_private.ifp_resource.start)
1071                 return;
1072
1073         if (INTEL_GTT_GEN == 6)
1074                 return;
1075
1076         /* setup a resource for this object */
1077         intel_private.ifp_resource.name = "Intel Flush Page";
1078         intel_private.ifp_resource.flags = IORESOURCE_MEM;
1079
1080         /* Setup chipset flush for 915 */
1081         if (IS_G33 || INTEL_GTT_GEN >= 4) {
1082                 intel_i965_g33_setup_chipset_flush();
1083         } else {
1084                 intel_i915_setup_chipset_flush();
1085         }
1086
1087         if (intel_private.ifp_resource.start)
1088                 intel_private.i9xx_flush_page = ioremap_nocache(intel_private.ifp_resource.start, PAGE_SIZE);
1089         if (!intel_private.i9xx_flush_page)
1090                 dev_err(&intel_private.pcidev->dev,
1091                         "can't ioremap flush page - no chipset flushing\n");
1092 }
1093
1094 static void i9xx_cleanup(void)
1095 {
1096         if (intel_private.i9xx_flush_page)
1097                 iounmap(intel_private.i9xx_flush_page);
1098         if (intel_private.resource_valid)
1099                 release_resource(&intel_private.ifp_resource);
1100         intel_private.ifp_resource.start = 0;
1101         intel_private.resource_valid = 0;
1102 }
1103
1104 static void i9xx_chipset_flush(void)
1105 {
1106         if (intel_private.i9xx_flush_page)
1107                 writel(1, intel_private.i9xx_flush_page);
1108 }
1109
1110 static void i965_write_entry(dma_addr_t addr,
1111                              unsigned int entry,
1112                              unsigned int flags)
1113 {
1114         u32 pte_flags;
1115
1116         pte_flags = I810_PTE_VALID;
1117         if (flags == AGP_USER_CACHED_MEMORY)
1118                 pte_flags |= I830_PTE_SYSTEM_CACHED;
1119
1120         /* Shift high bits down */
1121         addr |= (addr >> 28) & 0xf0;
1122         writel_relaxed(addr | pte_flags, intel_private.gtt + entry);
1123 }
1124
1125 static int i9xx_setup(void)
1126 {
1127         phys_addr_t reg_addr;
1128         int size = KB(512);
1129
1130         reg_addr = pci_resource_start(intel_private.pcidev, I915_MMADR_BAR);
1131
1132         intel_private.registers = ioremap(reg_addr, size);
1133         if (!intel_private.registers)
1134                 return -ENOMEM;
1135
1136         switch (INTEL_GTT_GEN) {
1137         case 3:
1138                 intel_private.gtt_phys_addr =
1139                         pci_resource_start(intel_private.pcidev, I915_PTE_BAR);
1140                 break;
1141         case 5:
1142                 intel_private.gtt_phys_addr = reg_addr + MB(2);
1143                 break;
1144         default:
1145                 intel_private.gtt_phys_addr = reg_addr + KB(512);
1146                 break;
1147         }
1148
1149         intel_i9xx_setup_flush();
1150
1151         return 0;
1152 }
1153
1154 #if IS_ENABLED(CONFIG_AGP_INTEL)
1155 static const struct agp_bridge_driver intel_fake_agp_driver = {
1156         .owner                  = THIS_MODULE,
1157         .size_type              = FIXED_APER_SIZE,
1158         .aperture_sizes         = intel_fake_agp_sizes,
1159         .num_aperture_sizes     = ARRAY_SIZE(intel_fake_agp_sizes),
1160         .configure              = intel_fake_agp_configure,
1161         .fetch_size             = intel_fake_agp_fetch_size,
1162         .cleanup                = intel_gtt_cleanup,
1163         .agp_enable             = intel_fake_agp_enable,
1164         .cache_flush            = global_cache_flush,
1165         .create_gatt_table      = intel_fake_agp_create_gatt_table,
1166         .free_gatt_table        = intel_fake_agp_free_gatt_table,
1167         .insert_memory          = intel_fake_agp_insert_entries,
1168         .remove_memory          = intel_fake_agp_remove_entries,
1169         .alloc_by_type          = intel_fake_agp_alloc_by_type,
1170         .free_by_type           = intel_i810_free_by_type,
1171         .agp_alloc_page         = agp_generic_alloc_page,
1172         .agp_alloc_pages        = agp_generic_alloc_pages,
1173         .agp_destroy_page       = agp_generic_destroy_page,
1174         .agp_destroy_pages      = agp_generic_destroy_pages,
1175 };
1176 #endif
1177
1178 static const struct intel_gtt_driver i81x_gtt_driver = {
1179         .gen = 1,
1180         .has_pgtbl_enable = 1,
1181         .dma_mask_size = 32,
1182         .setup = i810_setup,
1183         .cleanup = i810_cleanup,
1184         .check_flags = i830_check_flags,
1185         .write_entry = i810_write_entry,
1186 };
1187 static const struct intel_gtt_driver i8xx_gtt_driver = {
1188         .gen = 2,
1189         .has_pgtbl_enable = 1,
1190         .setup = i830_setup,
1191         .cleanup = i830_cleanup,
1192         .write_entry = i830_write_entry,
1193         .dma_mask_size = 32,
1194         .check_flags = i830_check_flags,
1195         .chipset_flush = i830_chipset_flush,
1196 };
1197 static const struct intel_gtt_driver i915_gtt_driver = {
1198         .gen = 3,
1199         .has_pgtbl_enable = 1,
1200         .setup = i9xx_setup,
1201         .cleanup = i9xx_cleanup,
1202         /* i945 is the last gpu to need phys mem (for overlay and cursors). */
1203         .write_entry = i830_write_entry,
1204         .dma_mask_size = 32,
1205         .check_flags = i830_check_flags,
1206         .chipset_flush = i9xx_chipset_flush,
1207 };
1208 static const struct intel_gtt_driver g33_gtt_driver = {
1209         .gen = 3,
1210         .is_g33 = 1,
1211         .setup = i9xx_setup,
1212         .cleanup = i9xx_cleanup,
1213         .write_entry = i965_write_entry,
1214         .dma_mask_size = 36,
1215         .check_flags = i830_check_flags,
1216         .chipset_flush = i9xx_chipset_flush,
1217 };
1218 static const struct intel_gtt_driver pineview_gtt_driver = {
1219         .gen = 3,
1220         .is_pineview = 1, .is_g33 = 1,
1221         .setup = i9xx_setup,
1222         .cleanup = i9xx_cleanup,
1223         .write_entry = i965_write_entry,
1224         .dma_mask_size = 36,
1225         .check_flags = i830_check_flags,
1226         .chipset_flush = i9xx_chipset_flush,
1227 };
1228 static const struct intel_gtt_driver i965_gtt_driver = {
1229         .gen = 4,
1230         .has_pgtbl_enable = 1,
1231         .setup = i9xx_setup,
1232         .cleanup = i9xx_cleanup,
1233         .write_entry = i965_write_entry,
1234         .dma_mask_size = 36,
1235         .check_flags = i830_check_flags,
1236         .chipset_flush = i9xx_chipset_flush,
1237 };
1238 static const struct intel_gtt_driver g4x_gtt_driver = {
1239         .gen = 5,
1240         .setup = i9xx_setup,
1241         .cleanup = i9xx_cleanup,
1242         .write_entry = i965_write_entry,
1243         .dma_mask_size = 36,
1244         .check_flags = i830_check_flags,
1245         .chipset_flush = i9xx_chipset_flush,
1246 };
1247 static const struct intel_gtt_driver ironlake_gtt_driver = {
1248         .gen = 5,
1249         .is_ironlake = 1,
1250         .setup = i9xx_setup,
1251         .cleanup = i9xx_cleanup,
1252         .write_entry = i965_write_entry,
1253         .dma_mask_size = 36,
1254         .check_flags = i830_check_flags,
1255         .chipset_flush = i9xx_chipset_flush,
1256 };
1257
1258 /* Table to describe Intel GMCH and AGP/PCIE GART drivers.  At least one of
1259  * driver and gmch_driver must be non-null, and find_gmch will determine
1260  * which one should be used if a gmch_chip_id is present.
1261  */
1262 static const struct intel_gtt_driver_description {
1263         unsigned int gmch_chip_id;
1264         char *name;
1265         const struct intel_gtt_driver *gtt_driver;
1266 } intel_gtt_chipsets[] = {
1267         { PCI_DEVICE_ID_INTEL_82810_IG1, "i810",
1268                 &i81x_gtt_driver},
1269         { PCI_DEVICE_ID_INTEL_82810_IG3, "i810",
1270                 &i81x_gtt_driver},
1271         { PCI_DEVICE_ID_INTEL_82810E_IG, "i810",
1272                 &i81x_gtt_driver},
1273         { PCI_DEVICE_ID_INTEL_82815_CGC, "i815",
1274                 &i81x_gtt_driver},
1275         { PCI_DEVICE_ID_INTEL_82830_CGC, "830M",
1276                 &i8xx_gtt_driver},
1277         { PCI_DEVICE_ID_INTEL_82845G_IG, "845G",
1278                 &i8xx_gtt_driver},
1279         { PCI_DEVICE_ID_INTEL_82854_IG, "854",
1280                 &i8xx_gtt_driver},
1281         { PCI_DEVICE_ID_INTEL_82855GM_IG, "855GM",
1282                 &i8xx_gtt_driver},
1283         { PCI_DEVICE_ID_INTEL_82865_IG, "865",
1284                 &i8xx_gtt_driver},
1285         { PCI_DEVICE_ID_INTEL_E7221_IG, "E7221 (i915)",
1286                 &i915_gtt_driver },
1287         { PCI_DEVICE_ID_INTEL_82915G_IG, "915G",
1288                 &i915_gtt_driver },
1289         { PCI_DEVICE_ID_INTEL_82915GM_IG, "915GM",
1290                 &i915_gtt_driver },
1291         { PCI_DEVICE_ID_INTEL_82945G_IG, "945G",
1292                 &i915_gtt_driver },
1293         { PCI_DEVICE_ID_INTEL_82945GM_IG, "945GM",
1294                 &i915_gtt_driver },
1295         { PCI_DEVICE_ID_INTEL_82945GME_IG, "945GME",
1296                 &i915_gtt_driver },
1297         { PCI_DEVICE_ID_INTEL_82946GZ_IG, "946GZ",
1298                 &i965_gtt_driver },
1299         { PCI_DEVICE_ID_INTEL_82G35_IG, "G35",
1300                 &i965_gtt_driver },
1301         { PCI_DEVICE_ID_INTEL_82965Q_IG, "965Q",
1302                 &i965_gtt_driver },
1303         { PCI_DEVICE_ID_INTEL_82965G_IG, "965G",
1304                 &i965_gtt_driver },
1305         { PCI_DEVICE_ID_INTEL_82965GM_IG, "965GM",
1306                 &i965_gtt_driver },
1307         { PCI_DEVICE_ID_INTEL_82965GME_IG, "965GME/GLE",
1308                 &i965_gtt_driver },
1309         { PCI_DEVICE_ID_INTEL_G33_IG, "G33",
1310                 &g33_gtt_driver },
1311         { PCI_DEVICE_ID_INTEL_Q35_IG, "Q35",
1312                 &g33_gtt_driver },
1313         { PCI_DEVICE_ID_INTEL_Q33_IG, "Q33",
1314                 &g33_gtt_driver },
1315         { PCI_DEVICE_ID_INTEL_PINEVIEW_M_IG, "GMA3150",
1316                 &pineview_gtt_driver },
1317         { PCI_DEVICE_ID_INTEL_PINEVIEW_IG, "GMA3150",
1318                 &pineview_gtt_driver },
1319         { PCI_DEVICE_ID_INTEL_GM45_IG, "GM45",
1320                 &g4x_gtt_driver },
1321         { PCI_DEVICE_ID_INTEL_EAGLELAKE_IG, "Eaglelake",
1322                 &g4x_gtt_driver },
1323         { PCI_DEVICE_ID_INTEL_Q45_IG, "Q45/Q43",
1324                 &g4x_gtt_driver },
1325         { PCI_DEVICE_ID_INTEL_G45_IG, "G45/G43",
1326                 &g4x_gtt_driver },
1327         { PCI_DEVICE_ID_INTEL_B43_IG, "B43",
1328                 &g4x_gtt_driver },
1329         { PCI_DEVICE_ID_INTEL_B43_1_IG, "B43",
1330                 &g4x_gtt_driver },
1331         { PCI_DEVICE_ID_INTEL_G41_IG, "G41",
1332                 &g4x_gtt_driver },
1333         { PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG,
1334             "HD Graphics", &ironlake_gtt_driver },
1335         { PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG,
1336             "HD Graphics", &ironlake_gtt_driver },
1337         { 0, NULL, NULL }
1338 };
1339
1340 static int find_gmch(u16 device)
1341 {
1342         struct pci_dev *gmch_device;
1343
1344         gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL, device, NULL);
1345         if (gmch_device && PCI_FUNC(gmch_device->devfn) != 0) {
1346                 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL,
1347                                              device, gmch_device);
1348         }
1349
1350         if (!gmch_device)
1351                 return 0;
1352
1353         intel_private.pcidev = gmch_device;
1354         return 1;
1355 }
1356
1357 int intel_gmch_probe(struct pci_dev *bridge_pdev, struct pci_dev *gpu_pdev,
1358                      struct agp_bridge_data *bridge)
1359 {
1360         int i, mask;
1361
1362         for (i = 0; intel_gtt_chipsets[i].name != NULL; i++) {
1363                 if (gpu_pdev) {
1364                         if (gpu_pdev->device ==
1365                             intel_gtt_chipsets[i].gmch_chip_id) {
1366                                 intel_private.pcidev = pci_dev_get(gpu_pdev);
1367                                 intel_private.driver =
1368                                         intel_gtt_chipsets[i].gtt_driver;
1369
1370                                 break;
1371                         }
1372                 } else if (find_gmch(intel_gtt_chipsets[i].gmch_chip_id)) {
1373                         intel_private.driver =
1374                                 intel_gtt_chipsets[i].gtt_driver;
1375                         break;
1376                 }
1377         }
1378
1379         if (!intel_private.driver)
1380                 return 0;
1381
1382 #if IS_ENABLED(CONFIG_AGP_INTEL)
1383         if (bridge) {
1384                 if (INTEL_GTT_GEN > 1)
1385                         return 0;
1386
1387                 bridge->driver = &intel_fake_agp_driver;
1388                 bridge->dev_private_data = &intel_private;
1389                 bridge->dev = bridge_pdev;
1390         }
1391 #endif
1392
1393
1394         /*
1395          * Can be called from the fake agp driver but also directly from
1396          * drm/i915.ko. Hence we need to check whether everything is set up
1397          * already.
1398          */
1399         if (intel_private.refcount++)
1400                 return 1;
1401
1402         intel_private.bridge_dev = pci_dev_get(bridge_pdev);
1403
1404         dev_info(&bridge_pdev->dev, "Intel %s Chipset\n", intel_gtt_chipsets[i].name);
1405
1406         mask = intel_private.driver->dma_mask_size;
1407         if (pci_set_dma_mask(intel_private.pcidev, DMA_BIT_MASK(mask)))
1408                 dev_err(&intel_private.pcidev->dev,
1409                         "set gfx device dma mask %d-bit failed!\n", mask);
1410         else
1411                 pci_set_consistent_dma_mask(intel_private.pcidev,
1412                                             DMA_BIT_MASK(mask));
1413
1414         if (intel_gtt_init() != 0) {
1415                 intel_gmch_remove();
1416
1417                 return 0;
1418         }
1419
1420         return 1;
1421 }
1422 EXPORT_SYMBOL(intel_gmch_probe);
1423
1424 void intel_gtt_get(u64 *gtt_total,
1425                    u32 *stolen_size,
1426                    phys_addr_t *mappable_base,
1427                    u64 *mappable_end)
1428 {
1429         *gtt_total = intel_private.gtt_total_entries << PAGE_SHIFT;
1430         *stolen_size = intel_private.stolen_size;
1431         *mappable_base = intel_private.gma_bus_addr;
1432         *mappable_end = intel_private.gtt_mappable_entries << PAGE_SHIFT;
1433 }
1434 EXPORT_SYMBOL(intel_gtt_get);
1435
1436 void intel_gtt_chipset_flush(void)
1437 {
1438         if (intel_private.driver->chipset_flush)
1439                 intel_private.driver->chipset_flush();
1440 }
1441 EXPORT_SYMBOL(intel_gtt_chipset_flush);
1442
1443 void intel_gmch_remove(void)
1444 {
1445         if (--intel_private.refcount)
1446                 return;
1447
1448         if (intel_private.scratch_page)
1449                 intel_gtt_teardown_scratch_page();
1450         if (intel_private.pcidev)
1451                 pci_dev_put(intel_private.pcidev);
1452         if (intel_private.bridge_dev)
1453                 pci_dev_put(intel_private.bridge_dev);
1454         intel_private.driver = NULL;
1455 }
1456 EXPORT_SYMBOL(intel_gmch_remove);
1457
1458 MODULE_AUTHOR("Dave Jones, Various @Intel");
1459 MODULE_LICENSE("GPL and additional rights");