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 42struct 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 62static 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 resource_size_t 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) 98static 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 119err: 120 sg_free_table(st); 121 return -ENOMEM; 122} 123 124static 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 138static void intel_fake_agp_enable(struct agp_bridge_data *bridge, u32 mode) 139{ 140 return; 141} 142 143/* Exists to support ARGB cursors */ 144static 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 161static 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 173static 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 205static 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) 212static 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 */ 239static 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 276static 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 294static 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 __free_page(page); 309 return -EINVAL; 310 } 311 312 intel_private.scratch_page_dma = dma_addr; 313 } else 314 intel_private.scratch_page_dma = page_to_phys(page); 315 316 intel_private.scratch_page = page; 317 318 return 0; 319} 320 321static void i810_write_entry(dma_addr_t addr, unsigned int entry, 322 unsigned int flags) 323{ 324 u32 pte_flags = I810_PTE_VALID; 325 326 switch (flags) { 327 case AGP_DCACHE_MEMORY: 328 pte_flags |= I810_PTE_LOCAL; 329 break; 330 case AGP_USER_CACHED_MEMORY: 331 pte_flags |= I830_PTE_SYSTEM_CACHED; 332 break; 333 } 334 335 writel_relaxed(addr | pte_flags, intel_private.gtt + entry); 336} 337 338static resource_size_t intel_gtt_stolen_size(void) 339{ 340 u16 gmch_ctrl; 341 u8 rdct; 342 int local = 0; 343 static const int ddt[4] = { 0, 16, 32, 64 }; 344 resource_size_t stolen_size = 0; 345 346 if (INTEL_GTT_GEN == 1) 347 return 0; /* no stolen mem on i81x */ 348 349 pci_read_config_word(intel_private.bridge_dev, 350 I830_GMCH_CTRL, &gmch_ctrl); 351 352 if (intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82830_HB || 353 intel_private.bridge_dev->device == PCI_DEVICE_ID_INTEL_82845G_HB) { 354 switch (gmch_ctrl & I830_GMCH_GMS_MASK) { 355 case I830_GMCH_GMS_STOLEN_512: 356 stolen_size = KB(512); 357 break; 358 case I830_GMCH_GMS_STOLEN_1024: 359 stolen_size = MB(1); 360 break; 361 case I830_GMCH_GMS_STOLEN_8192: 362 stolen_size = MB(8); 363 break; 364 case I830_GMCH_GMS_LOCAL: 365 rdct = readb(intel_private.registers+I830_RDRAM_CHANNEL_TYPE); 366 stolen_size = (I830_RDRAM_ND(rdct) + 1) * 367 MB(ddt[I830_RDRAM_DDT(rdct)]); 368 local = 1; 369 break; 370 default: 371 stolen_size = 0; 372 break; 373 } 374 } else { 375 switch (gmch_ctrl & I855_GMCH_GMS_MASK) { 376 case I855_GMCH_GMS_STOLEN_1M: 377 stolen_size = MB(1); 378 break; 379 case I855_GMCH_GMS_STOLEN_4M: 380 stolen_size = MB(4); 381 break; 382 case I855_GMCH_GMS_STOLEN_8M: 383 stolen_size = MB(8); 384 break; 385 case I855_GMCH_GMS_STOLEN_16M: 386 stolen_size = MB(16); 387 break; 388 case I855_GMCH_GMS_STOLEN_32M: 389 stolen_size = MB(32); 390 break; 391 case I915_GMCH_GMS_STOLEN_48M: 392 stolen_size = MB(48); 393 break; 394 case I915_GMCH_GMS_STOLEN_64M: 395 stolen_size = MB(64); 396 break; 397 case G33_GMCH_GMS_STOLEN_128M: 398 stolen_size = MB(128); 399 break; 400 case G33_GMCH_GMS_STOLEN_256M: 401 stolen_size = MB(256); 402 break; 403 case INTEL_GMCH_GMS_STOLEN_96M: 404 stolen_size = MB(96); 405 break; 406 case INTEL_GMCH_GMS_STOLEN_160M: 407 stolen_size = MB(160); 408 break; 409 case INTEL_GMCH_GMS_STOLEN_224M: 410 stolen_size = MB(224); 411 break; 412 case INTEL_GMCH_GMS_STOLEN_352M: 413 stolen_size = MB(352); 414 break; 415 default: 416 stolen_size = 0; 417 break; 418 } 419 } 420 421 if (stolen_size > 0) { 422 dev_info(&intel_private.bridge_dev->dev, "detected %lluK %s memory\n", 423 (u64)stolen_size / KB(1), local ? "local" : "stolen"); 424 } else { 425 dev_info(&intel_private.bridge_dev->dev, 426 "no pre-allocated video memory detected\n"); 427 stolen_size = 0; 428 } 429 430 return stolen_size; 431} 432 433static void i965_adjust_pgetbl_size(unsigned int size_flag) 434{ 435 u32 pgetbl_ctl, pgetbl_ctl2; 436 437 /* ensure that ppgtt is disabled */ 438 pgetbl_ctl2 = readl(intel_private.registers+I965_PGETBL_CTL2); 439 pgetbl_ctl2 &= ~I810_PGETBL_ENABLED; 440 writel(pgetbl_ctl2, intel_private.registers+I965_PGETBL_CTL2); 441 442 /* write the new ggtt size */ 443 pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL); 444 pgetbl_ctl &= ~I965_PGETBL_SIZE_MASK; 445 pgetbl_ctl |= size_flag; 446 writel(pgetbl_ctl, intel_private.registers+I810_PGETBL_CTL); 447} 448 449static unsigned int i965_gtt_total_entries(void) 450{ 451 int size; 452 u32 pgetbl_ctl; 453 u16 gmch_ctl; 454 455 pci_read_config_word(intel_private.bridge_dev, 456 I830_GMCH_CTRL, &gmch_ctl); 457 458 if (INTEL_GTT_GEN == 5) { 459 switch (gmch_ctl & G4x_GMCH_SIZE_MASK) { 460 case G4x_GMCH_SIZE_1M: 461 case G4x_GMCH_SIZE_VT_1M: 462 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1MB); 463 break; 464 case G4x_GMCH_SIZE_VT_1_5M: 465 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_1_5MB); 466 break; 467 case G4x_GMCH_SIZE_2M: 468 case G4x_GMCH_SIZE_VT_2M: 469 i965_adjust_pgetbl_size(I965_PGETBL_SIZE_2MB); 470 break; 471 } 472 } 473 474 pgetbl_ctl = readl(intel_private.registers+I810_PGETBL_CTL); 475 476 switch (pgetbl_ctl & I965_PGETBL_SIZE_MASK) { 477 case I965_PGETBL_SIZE_128KB: 478 size = KB(128); 479 break; 480 case I965_PGETBL_SIZE_256KB: 481 size = KB(256); 482 break; 483 case I965_PGETBL_SIZE_512KB: 484 size = KB(512); 485 break; 486 /* GTT pagetable sizes bigger than 512KB are not possible on G33! */ 487 case I965_PGETBL_SIZE_1MB: 488 size = KB(1024); 489 break; 490 case I965_PGETBL_SIZE_2MB: 491 size = KB(2048); 492 break; 493 case I965_PGETBL_SIZE_1_5MB: 494 size = KB(1024 + 512); 495 break; 496 default: 497 dev_info(&intel_private.pcidev->dev, 498 "unknown page table size, assuming 512KB\n"); 499 size = KB(512); 500 } 501 502 return size/4; 503} 504 505static unsigned int intel_gtt_total_entries(void) 506{ 507 if (IS_G33 || INTEL_GTT_GEN == 4 || INTEL_GTT_GEN == 5) 508 return i965_gtt_total_entries(); 509 else { 510 /* On previous hardware, the GTT size was just what was 511 * required to map the aperture. 512 */ 513 return intel_private.gtt_mappable_entries; 514 } 515} 516 517static unsigned int intel_gtt_mappable_entries(void) 518{ 519 unsigned int aperture_size; 520 521 if (INTEL_GTT_GEN == 1) { 522 u32 smram_miscc; 523 524 pci_read_config_dword(intel_private.bridge_dev, 525 I810_SMRAM_MISCC, &smram_miscc); 526 527 if ((smram_miscc & I810_GFX_MEM_WIN_SIZE) 528 == I810_GFX_MEM_WIN_32M) 529 aperture_size = MB(32); 530 else 531 aperture_size = MB(64); 532 } else if (INTEL_GTT_GEN == 2) { 533 u16 gmch_ctrl; 534 535 pci_read_config_word(intel_private.bridge_dev, 536 I830_GMCH_CTRL, &gmch_ctrl); 537 538 if ((gmch_ctrl & I830_GMCH_MEM_MASK) == I830_GMCH_MEM_64M) 539 aperture_size = MB(64); 540 else 541 aperture_size = MB(128); 542 } else { 543 /* 9xx supports large sizes, just look at the length */ 544 aperture_size = pci_resource_len(intel_private.pcidev, 2); 545 } 546 547 return aperture_size >> PAGE_SHIFT; 548} 549 550static void intel_gtt_teardown_scratch_page(void) 551{ 552 set_pages_wb(intel_private.scratch_page, 1); 553 if (intel_private.needs_dmar) 554 pci_unmap_page(intel_private.pcidev, 555 intel_private.scratch_page_dma, 556 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); 557 __free_page(intel_private.scratch_page); 558} 559 560static void intel_gtt_cleanup(void) 561{ 562 intel_private.driver->cleanup(); 563 564 iounmap(intel_private.gtt); 565 iounmap(intel_private.registers); 566 567 intel_gtt_teardown_scratch_page(); 568} 569 570/* Certain Gen5 chipsets require require idling the GPU before 571 * unmapping anything from the GTT when VT-d is enabled. 572 */ 573static inline int needs_ilk_vtd_wa(void) 574{ 575#ifdef CONFIG_INTEL_IOMMU 576 const unsigned short gpu_devid = intel_private.pcidev->device; 577 578 /* Query intel_iommu to see if we need the workaround. Presumably that 579 * was loaded first. 580 */ 581 if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG || 582 gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) && 583 intel_iommu_gfx_mapped) 584 return 1; 585#endif 586 return 0; 587} 588 589static bool intel_gtt_can_wc(void) 590{ 591 if (INTEL_GTT_GEN <= 2) 592 return false; 593 594 if (INTEL_GTT_GEN >= 6) 595 return false; 596 597 /* Reports of major corruption with ILK vt'd enabled */ 598 if (needs_ilk_vtd_wa()) 599 return false; 600 601 return true; 602} 603 604static int intel_gtt_init(void) 605{ 606 u32 gtt_map_size; 607 int ret, bar; 608 609 ret = intel_private.driver->setup(); 610 if (ret != 0) 611 return ret; 612 613 intel_private.gtt_mappable_entries = intel_gtt_mappable_entries(); 614 intel_private.gtt_total_entries = intel_gtt_total_entries(); 615 616 /* save the PGETBL reg for resume */ 617 intel_private.PGETBL_save = 618 readl(intel_private.registers+I810_PGETBL_CTL) 619 & ~I810_PGETBL_ENABLED; 620 /* we only ever restore the register when enabling the PGTBL... */ 621 if (HAS_PGTBL_EN) 622 intel_private.PGETBL_save |= I810_PGETBL_ENABLED; 623 624 dev_info(&intel_private.bridge_dev->dev, 625 "detected gtt size: %dK total, %dK mappable\n", 626 intel_private.gtt_total_entries * 4, 627 intel_private.gtt_mappable_entries * 4); 628 629 gtt_map_size = intel_private.gtt_total_entries * 4; 630 631 intel_private.gtt = NULL; 632 if (intel_gtt_can_wc()) 633 intel_private.gtt = ioremap_wc(intel_private.gtt_phys_addr, 634 gtt_map_size); 635 if (intel_private.gtt == NULL) 636 intel_private.gtt = ioremap(intel_private.gtt_phys_addr, 637 gtt_map_size); 638 if (intel_private.gtt == NULL) { 639 intel_private.driver->cleanup(); 640 iounmap(intel_private.registers); 641 return -ENOMEM; 642 } 643 644#if IS_ENABLED(CONFIG_AGP_INTEL) 645 global_cache_flush(); /* FIXME: ? */ 646#endif 647 648 intel_private.stolen_size = intel_gtt_stolen_size(); 649 650 intel_private.needs_dmar = USE_PCI_DMA_API && INTEL_GTT_GEN > 2; 651 652 ret = intel_gtt_setup_scratch_page(); 653 if (ret != 0) { 654 intel_gtt_cleanup(); 655 return ret; 656 } 657 658 if (INTEL_GTT_GEN <= 2) 659 bar = I810_GMADR_BAR; 660 else 661 bar = I915_GMADR_BAR; 662 663 intel_private.gma_bus_addr = pci_bus_address(intel_private.pcidev, bar); 664 return 0; 665} 666 667#if IS_ENABLED(CONFIG_AGP_INTEL) 668static const struct aper_size_info_fixed intel_fake_agp_sizes[] = { 669 {32, 8192, 3}, 670 {64, 16384, 4}, 671 {128, 32768, 5}, 672 {256, 65536, 6}, 673 {512, 131072, 7}, 674}; 675 676static int intel_fake_agp_fetch_size(void) 677{ 678 int num_sizes = ARRAY_SIZE(intel_fake_agp_sizes); 679 unsigned int aper_size; 680 int i; 681 682 aper_size = (intel_private.gtt_mappable_entries << PAGE_SHIFT) / MB(1); 683 684 for (i = 0; i < num_sizes; i++) { 685 if (aper_size == intel_fake_agp_sizes[i].size) { 686 agp_bridge->current_size = 687 (void *) (intel_fake_agp_sizes + i); 688 return aper_size; 689 } 690 } 691 692 return 0; 693} 694#endif 695 696static void i830_cleanup(void) 697{ 698} 699 700/* The chipset_flush interface needs to get data that has already been 701 * flushed out of the CPU all the way out to main memory, because the GPU 702 * doesn't snoop those buffers. 703 * 704 * The 8xx series doesn't have the same lovely interface for flushing the 705 * chipset write buffers that the later chips do. According to the 865 706 * specs, it's 64 octwords, or 1KB. So, to get those previous things in 707 * that buffer out, we just fill 1KB and clflush it out, on the assumption 708 * that it'll push whatever was in there out. It appears to work. 709 */ 710static void i830_chipset_flush(void) 711{ 712 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 713 714 /* Forcibly evict everything from the CPU write buffers. 715 * clflush appears to be insufficient. 716 */ 717 wbinvd_on_all_cpus(); 718 719 /* Now we've only seen documents for this magic bit on 855GM, 720 * we hope it exists for the other gen2 chipsets... 721 * 722 * Also works as advertised on my 845G. 723 */ 724 writel(readl(intel_private.registers+I830_HIC) | (1<<31), 725 intel_private.registers+I830_HIC); 726 727 while (readl(intel_private.registers+I830_HIC) & (1<<31)) { 728 if (time_after(jiffies, timeout)) 729 break; 730 731 udelay(50); 732 } 733} 734 735static void i830_write_entry(dma_addr_t addr, unsigned int entry, 736 unsigned int flags) 737{ 738 u32 pte_flags = I810_PTE_VALID; 739 740 if (flags == AGP_USER_CACHED_MEMORY) 741 pte_flags |= I830_PTE_SYSTEM_CACHED; 742 743 writel_relaxed(addr | pte_flags, intel_private.gtt + entry); 744} 745 746bool intel_enable_gtt(void) 747{ 748 u8 __iomem *reg; 749 750 if (INTEL_GTT_GEN == 2) { 751 u16 gmch_ctrl; 752 753 pci_read_config_word(intel_private.bridge_dev, 754 I830_GMCH_CTRL, &gmch_ctrl); 755 gmch_ctrl |= I830_GMCH_ENABLED; 756 pci_write_config_word(intel_private.bridge_dev, 757 I830_GMCH_CTRL, gmch_ctrl); 758 759 pci_read_config_word(intel_private.bridge_dev, 760 I830_GMCH_CTRL, &gmch_ctrl); 761 if ((gmch_ctrl & I830_GMCH_ENABLED) == 0) { 762 dev_err(&intel_private.pcidev->dev, 763 "failed to enable the GTT: GMCH_CTRL=%x\n", 764 gmch_ctrl); 765 return false; 766 } 767 } 768 769 /* On the resume path we may be adjusting the PGTBL value, so 770 * be paranoid and flush all chipset write buffers... 771 */ 772 if (INTEL_GTT_GEN >= 3) 773 writel(0, intel_private.registers+GFX_FLSH_CNTL); 774 775 reg = intel_private.registers+I810_PGETBL_CTL; 776 writel(intel_private.PGETBL_save, reg); 777 if (HAS_PGTBL_EN && (readl(reg) & I810_PGETBL_ENABLED) == 0) { 778 dev_err(&intel_private.pcidev->dev, 779 "failed to enable the GTT: PGETBL=%x [expected %x]\n", 780 readl(reg), intel_private.PGETBL_save); 781 return false; 782 } 783 784 if (INTEL_GTT_GEN >= 3) 785 writel(0, intel_private.registers+GFX_FLSH_CNTL); 786 787 return true; 788} 789EXPORT_SYMBOL(intel_enable_gtt); 790 791static int i830_setup(void) 792{ 793 phys_addr_t reg_addr; 794 795 reg_addr = pci_resource_start(intel_private.pcidev, I810_MMADR_BAR); 796 797 intel_private.registers = ioremap(reg_addr, KB(64)); 798 if (!intel_private.registers) 799 return -ENOMEM; 800 801 intel_private.gtt_phys_addr = reg_addr + I810_PTE_BASE; 802 803 return 0; 804} 805 806#if IS_ENABLED(CONFIG_AGP_INTEL) 807static int intel_fake_agp_create_gatt_table(struct agp_bridge_data *bridge) 808{ 809 agp_bridge->gatt_table_real = NULL; 810 agp_bridge->gatt_table = NULL; 811 agp_bridge->gatt_bus_addr = 0; 812 813 return 0; 814} 815 816static int intel_fake_agp_free_gatt_table(struct agp_bridge_data *bridge) 817{ 818 return 0; 819} 820 821static int intel_fake_agp_configure(void) 822{ 823 if (!intel_enable_gtt()) 824 return -EIO; 825 826 intel_private.clear_fake_agp = true; 827 agp_bridge->gart_bus_addr = intel_private.gma_bus_addr; 828 829 return 0; 830} 831#endif 832 833static bool i830_check_flags(unsigned int flags) 834{ 835 switch (flags) { 836 case 0: 837 case AGP_PHYS_MEMORY: 838 case AGP_USER_CACHED_MEMORY: 839 case AGP_USER_MEMORY: 840 return true; 841 } 842 843 return false; 844} 845 846void intel_gtt_insert_page(dma_addr_t addr, 847 unsigned int pg, 848 unsigned int flags) 849{ 850 intel_private.driver->write_entry(addr, pg, flags); 851 readl(intel_private.gtt + pg); 852 if (intel_private.driver->chipset_flush) 853 intel_private.driver->chipset_flush(); 854} 855EXPORT_SYMBOL(intel_gtt_insert_page); 856 857void intel_gtt_insert_sg_entries(struct sg_table *st, 858 unsigned int pg_start, 859 unsigned int flags) 860{ 861 struct scatterlist *sg; 862 unsigned int len, m; 863 int i, j; 864 865 j = pg_start; 866 867 /* sg may merge pages, but we have to separate 868 * per-page addr for GTT */ 869 for_each_sg(st->sgl, sg, st->nents, i) { 870 len = sg_dma_len(sg) >> PAGE_SHIFT; 871 for (m = 0; m < len; m++) { 872 dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT); 873 intel_private.driver->write_entry(addr, j, flags); 874 j++; 875 } 876 } 877 readl(intel_private.gtt + j - 1); 878 if (intel_private.driver->chipset_flush) 879 intel_private.driver->chipset_flush(); 880} 881EXPORT_SYMBOL(intel_gtt_insert_sg_entries); 882 883#if IS_ENABLED(CONFIG_AGP_INTEL) 884static void intel_gtt_insert_pages(unsigned int first_entry, 885 unsigned int num_entries, 886 struct page **pages, 887 unsigned int flags) 888{ 889 int i, j; 890 891 for (i = 0, j = first_entry; i < num_entries; i++, j++) { 892 dma_addr_t addr = page_to_phys(pages[i]); 893 intel_private.driver->write_entry(addr, 894 j, flags); 895 } 896 wmb(); 897} 898 899static int intel_fake_agp_insert_entries(struct agp_memory *mem, 900 off_t pg_start, int type) 901{ 902 int ret = -EINVAL; 903 904 if (intel_private.clear_fake_agp) { 905 int start = intel_private.stolen_size / PAGE_SIZE; 906 int end = intel_private.gtt_mappable_entries; 907 intel_gtt_clear_range(start, end - start); 908 intel_private.clear_fake_agp = false; 909 } 910 911 if (INTEL_GTT_GEN == 1 && type == AGP_DCACHE_MEMORY) 912 return i810_insert_dcache_entries(mem, pg_start, type); 913 914 if (mem->page_count == 0) 915 goto out; 916 917 if (pg_start + mem->page_count > intel_private.gtt_total_entries) 918 goto out_err; 919 920 if (type != mem->type) 921 goto out_err; 922 923 if (!intel_private.driver->check_flags(type)) 924 goto out_err; 925 926 if (!mem->is_flushed) 927 global_cache_flush(); 928 929 if (intel_private.needs_dmar) { 930 struct sg_table st; 931 932 ret = intel_gtt_map_memory(mem->pages, mem->page_count, &st); 933 if (ret != 0) 934 return ret; 935 936 intel_gtt_insert_sg_entries(&st, pg_start, type); 937 mem->sg_list = st.sgl; 938 mem->num_sg = st.nents; 939 } else 940 intel_gtt_insert_pages(pg_start, mem->page_count, mem->pages, 941 type); 942 943out: 944 ret = 0; 945out_err: 946 mem->is_flushed = true; 947 return ret; 948} 949#endif 950 951void intel_gtt_clear_range(unsigned int first_entry, unsigned int num_entries) 952{ 953 unsigned int i; 954 955 for (i = first_entry; i < (first_entry + num_entries); i++) { 956 intel_private.driver->write_entry(intel_private.scratch_page_dma, 957 i, 0); 958 } 959 wmb(); 960} 961EXPORT_SYMBOL(intel_gtt_clear_range); 962 963#if IS_ENABLED(CONFIG_AGP_INTEL) 964static int intel_fake_agp_remove_entries(struct agp_memory *mem, 965 off_t pg_start, int type) 966{ 967 if (mem->page_count == 0) 968 return 0; 969 970 intel_gtt_clear_range(pg_start, mem->page_count); 971 972 if (intel_private.needs_dmar) { 973 intel_gtt_unmap_memory(mem->sg_list, mem->num_sg); 974 mem->sg_list = NULL; 975 mem->num_sg = 0; 976 } 977 978 return 0; 979} 980 981static struct agp_memory *intel_fake_agp_alloc_by_type(size_t pg_count, 982 int type) 983{ 984 struct agp_memory *new; 985 986 if (type == AGP_DCACHE_MEMORY && INTEL_GTT_GEN == 1) { 987 if (pg_count != intel_private.num_dcache_entries) 988 return NULL; 989 990 new = agp_create_memory(1); 991 if (new == NULL) 992 return NULL; 993 994 new->type = AGP_DCACHE_MEMORY; 995 new->page_count = pg_count; 996 new->num_scratch_pages = 0; 997 agp_free_page_array(new); 998 return new; 999 } 1000 if (type == AGP_PHYS_MEMORY) 1001 return alloc_agpphysmem_i8xx(pg_count, type); 1002 /* always return NULL for other allocation types for now */ 1003 return NULL; 1004} 1005#endif 1006 1007static int intel_alloc_chipset_flush_resource(void) 1008{ 1009 int ret; 1010 ret = pci_bus_alloc_resource(intel_private.bridge_dev->bus, &intel_private.ifp_resource, PAGE_SIZE, 1011 PAGE_SIZE, PCIBIOS_MIN_MEM, 0, 1012 pcibios_align_resource, intel_private.bridge_dev); 1013 1014 return ret; 1015} 1016 1017static void intel_i915_setup_chipset_flush(void) 1018{ 1019 int ret; 1020 u32 temp; 1021 1022 pci_read_config_dword(intel_private.bridge_dev, I915_IFPADDR, &temp); 1023 if (!(temp & 0x1)) { 1024 intel_alloc_chipset_flush_resource(); 1025 intel_private.resource_valid = 1; 1026 pci_write_config_dword(intel_private.bridge_dev, I915_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1); 1027 } else { 1028 temp &= ~1; 1029 1030 intel_private.resource_valid = 1; 1031 intel_private.ifp_resource.start = temp; 1032 intel_private.ifp_resource.end = temp + PAGE_SIZE; 1033 ret = request_resource(&iomem_resource, &intel_private.ifp_resource); 1034 /* some BIOSes reserve this area in a pnp some don't */ 1035 if (ret) 1036 intel_private.resource_valid = 0; 1037 } 1038} 1039 1040static void intel_i965_g33_setup_chipset_flush(void) 1041{ 1042 u32 temp_hi, temp_lo; 1043 int ret; 1044 1045 pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4, &temp_hi); 1046 pci_read_config_dword(intel_private.bridge_dev, I965_IFPADDR, &temp_lo); 1047 1048 if (!(temp_lo & 0x1)) { 1049 1050 intel_alloc_chipset_flush_resource(); 1051 1052 intel_private.resource_valid = 1; 1053 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR + 4, 1054 upper_32_bits(intel_private.ifp_resource.start)); 1055 pci_write_config_dword(intel_private.bridge_dev, I965_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1); 1056 } else { 1057 u64 l64; 1058 1059 temp_lo &= ~0x1; 1060 l64 = ((u64)temp_hi << 32) | temp_lo; 1061 1062 intel_private.resource_valid = 1; 1063 intel_private.ifp_resource.start = l64; 1064 intel_private.ifp_resource.end = l64 + 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 1072static void intel_i9xx_setup_flush(void) 1073{ 1074 /* return if already configured */ 1075 if (intel_private.ifp_resource.start) 1076 return; 1077 1078 if (INTEL_GTT_GEN == 6) 1079 return; 1080 1081 /* setup a resource for this object */ 1082 intel_private.ifp_resource.name = "Intel Flush Page"; 1083 intel_private.ifp_resource.flags = IORESOURCE_MEM; 1084 1085 /* Setup chipset flush for 915 */ 1086 if (IS_G33 || INTEL_GTT_GEN >= 4) { 1087 intel_i965_g33_setup_chipset_flush(); 1088 } else { 1089 intel_i915_setup_chipset_flush(); 1090 } 1091 1092 if (intel_private.ifp_resource.start) 1093 intel_private.i9xx_flush_page = ioremap(intel_private.ifp_resource.start, PAGE_SIZE); 1094 if (!intel_private.i9xx_flush_page) 1095 dev_err(&intel_private.pcidev->dev, 1096 "can't ioremap flush page - no chipset flushing\n"); 1097} 1098 1099static void i9xx_cleanup(void) 1100{ 1101 if (intel_private.i9xx_flush_page) 1102 iounmap(intel_private.i9xx_flush_page); 1103 if (intel_private.resource_valid) 1104 release_resource(&intel_private.ifp_resource); 1105 intel_private.ifp_resource.start = 0; 1106 intel_private.resource_valid = 0; 1107} 1108 1109static void i9xx_chipset_flush(void) 1110{ 1111 wmb(); 1112 if (intel_private.i9xx_flush_page) 1113 writel(1, intel_private.i9xx_flush_page); 1114} 1115 1116static void i965_write_entry(dma_addr_t addr, 1117 unsigned int entry, 1118 unsigned int flags) 1119{ 1120 u32 pte_flags; 1121 1122 pte_flags = I810_PTE_VALID; 1123 if (flags == AGP_USER_CACHED_MEMORY) 1124 pte_flags |= I830_PTE_SYSTEM_CACHED; 1125 1126 /* Shift high bits down */ 1127 addr |= (addr >> 28) & 0xf0; 1128 writel_relaxed(addr | pte_flags, intel_private.gtt + entry); 1129} 1130 1131static int i9xx_setup(void) 1132{ 1133 phys_addr_t reg_addr; 1134 int size = KB(512); 1135 1136 reg_addr = pci_resource_start(intel_private.pcidev, I915_MMADR_BAR); 1137 1138 intel_private.registers = ioremap(reg_addr, size); 1139 if (!intel_private.registers) 1140 return -ENOMEM; 1141 1142 switch (INTEL_GTT_GEN) { 1143 case 3: 1144 intel_private.gtt_phys_addr = 1145 pci_resource_start(intel_private.pcidev, I915_PTE_BAR); 1146 break; 1147 case 5: 1148 intel_private.gtt_phys_addr = reg_addr + MB(2); 1149 break; 1150 default: 1151 intel_private.gtt_phys_addr = reg_addr + KB(512); 1152 break; 1153 } 1154 1155 intel_i9xx_setup_flush(); 1156 1157 return 0; 1158} 1159 1160#if IS_ENABLED(CONFIG_AGP_INTEL) 1161static const struct agp_bridge_driver intel_fake_agp_driver = { 1162 .owner = THIS_MODULE, 1163 .size_type = FIXED_APER_SIZE, 1164 .aperture_sizes = intel_fake_agp_sizes, 1165 .num_aperture_sizes = ARRAY_SIZE(intel_fake_agp_sizes), 1166 .configure = intel_fake_agp_configure, 1167 .fetch_size = intel_fake_agp_fetch_size, 1168 .cleanup = intel_gtt_cleanup, 1169 .agp_enable = intel_fake_agp_enable, 1170 .cache_flush = global_cache_flush, 1171 .create_gatt_table = intel_fake_agp_create_gatt_table, 1172 .free_gatt_table = intel_fake_agp_free_gatt_table, 1173 .insert_memory = intel_fake_agp_insert_entries, 1174 .remove_memory = intel_fake_agp_remove_entries, 1175 .alloc_by_type = intel_fake_agp_alloc_by_type, 1176 .free_by_type = intel_i810_free_by_type, 1177 .agp_alloc_page = agp_generic_alloc_page, 1178 .agp_alloc_pages = agp_generic_alloc_pages, 1179 .agp_destroy_page = agp_generic_destroy_page, 1180 .agp_destroy_pages = agp_generic_destroy_pages, 1181}; 1182#endif 1183 1184static const struct intel_gtt_driver i81x_gtt_driver = { 1185 .gen = 1, 1186 .has_pgtbl_enable = 1, 1187 .dma_mask_size = 32, 1188 .setup = i810_setup, 1189 .cleanup = i810_cleanup, 1190 .check_flags = i830_check_flags, 1191 .write_entry = i810_write_entry, 1192}; 1193static const struct intel_gtt_driver i8xx_gtt_driver = { 1194 .gen = 2, 1195 .has_pgtbl_enable = 1, 1196 .setup = i830_setup, 1197 .cleanup = i830_cleanup, 1198 .write_entry = i830_write_entry, 1199 .dma_mask_size = 32, 1200 .check_flags = i830_check_flags, 1201 .chipset_flush = i830_chipset_flush, 1202}; 1203static const struct intel_gtt_driver i915_gtt_driver = { 1204 .gen = 3, 1205 .has_pgtbl_enable = 1, 1206 .setup = i9xx_setup, 1207 .cleanup = i9xx_cleanup, 1208 /* i945 is the last gpu to need phys mem (for overlay and cursors). */ 1209 .write_entry = i830_write_entry, 1210 .dma_mask_size = 32, 1211 .check_flags = i830_check_flags, 1212 .chipset_flush = i9xx_chipset_flush, 1213}; 1214static const struct intel_gtt_driver g33_gtt_driver = { 1215 .gen = 3, 1216 .is_g33 = 1, 1217 .setup = i9xx_setup, 1218 .cleanup = i9xx_cleanup, 1219 .write_entry = i965_write_entry, 1220 .dma_mask_size = 36, 1221 .check_flags = i830_check_flags, 1222 .chipset_flush = i9xx_chipset_flush, 1223}; 1224static const struct intel_gtt_driver pineview_gtt_driver = { 1225 .gen = 3, 1226 .is_pineview = 1, .is_g33 = 1, 1227 .setup = i9xx_setup, 1228 .cleanup = i9xx_cleanup, 1229 .write_entry = i965_write_entry, 1230 .dma_mask_size = 36, 1231 .check_flags = i830_check_flags, 1232 .chipset_flush = i9xx_chipset_flush, 1233}; 1234static const struct intel_gtt_driver i965_gtt_driver = { 1235 .gen = 4, 1236 .has_pgtbl_enable = 1, 1237 .setup = i9xx_setup, 1238 .cleanup = i9xx_cleanup, 1239 .write_entry = i965_write_entry, 1240 .dma_mask_size = 36, 1241 .check_flags = i830_check_flags, 1242 .chipset_flush = i9xx_chipset_flush, 1243}; 1244static const struct intel_gtt_driver g4x_gtt_driver = { 1245 .gen = 5, 1246 .setup = i9xx_setup, 1247 .cleanup = i9xx_cleanup, 1248 .write_entry = i965_write_entry, 1249 .dma_mask_size = 36, 1250 .check_flags = i830_check_flags, 1251 .chipset_flush = i9xx_chipset_flush, 1252}; 1253static const struct intel_gtt_driver ironlake_gtt_driver = { 1254 .gen = 5, 1255 .is_ironlake = 1, 1256 .setup = i9xx_setup, 1257 .cleanup = i9xx_cleanup, 1258 .write_entry = i965_write_entry, 1259 .dma_mask_size = 36, 1260 .check_flags = i830_check_flags, 1261 .chipset_flush = i9xx_chipset_flush, 1262}; 1263 1264/* Table to describe Intel GMCH and AGP/PCIE GART drivers. At least one of 1265 * driver and gmch_driver must be non-null, and find_gmch will determine 1266 * which one should be used if a gmch_chip_id is present. 1267 */ 1268static const struct intel_gtt_driver_description { 1269 unsigned int gmch_chip_id; 1270 char *name; 1271 const struct intel_gtt_driver *gtt_driver; 1272} intel_gtt_chipsets[] = { 1273 { PCI_DEVICE_ID_INTEL_82810_IG1, "i810", 1274 &i81x_gtt_driver}, 1275 { PCI_DEVICE_ID_INTEL_82810_IG3, "i810", 1276 &i81x_gtt_driver}, 1277 { PCI_DEVICE_ID_INTEL_82810E_IG, "i810", 1278 &i81x_gtt_driver}, 1279 { PCI_DEVICE_ID_INTEL_82815_CGC, "i815", 1280 &i81x_gtt_driver}, 1281 { PCI_DEVICE_ID_INTEL_82830_CGC, "830M", 1282 &i8xx_gtt_driver}, 1283 { PCI_DEVICE_ID_INTEL_82845G_IG, "845G", 1284 &i8xx_gtt_driver}, 1285 { PCI_DEVICE_ID_INTEL_82854_IG, "854", 1286 &i8xx_gtt_driver}, 1287 { PCI_DEVICE_ID_INTEL_82855GM_IG, "855GM", 1288 &i8xx_gtt_driver}, 1289 { PCI_DEVICE_ID_INTEL_82865_IG, "865", 1290 &i8xx_gtt_driver}, 1291 { PCI_DEVICE_ID_INTEL_E7221_IG, "E7221 (i915)", 1292 &i915_gtt_driver }, 1293 { PCI_DEVICE_ID_INTEL_82915G_IG, "915G", 1294 &i915_gtt_driver }, 1295 { PCI_DEVICE_ID_INTEL_82915GM_IG, "915GM", 1296 &i915_gtt_driver }, 1297 { PCI_DEVICE_ID_INTEL_82945G_IG, "945G", 1298 &i915_gtt_driver }, 1299 { PCI_DEVICE_ID_INTEL_82945GM_IG, "945GM", 1300 &i915_gtt_driver }, 1301 { PCI_DEVICE_ID_INTEL_82945GME_IG, "945GME", 1302 &i915_gtt_driver }, 1303 { PCI_DEVICE_ID_INTEL_82946GZ_IG, "946GZ", 1304 &i965_gtt_driver }, 1305 { PCI_DEVICE_ID_INTEL_82G35_IG, "G35", 1306 &i965_gtt_driver }, 1307 { PCI_DEVICE_ID_INTEL_82965Q_IG, "965Q", 1308 &i965_gtt_driver }, 1309 { PCI_DEVICE_ID_INTEL_82965G_IG, "965G", 1310 &i965_gtt_driver }, 1311 { PCI_DEVICE_ID_INTEL_82965GM_IG, "965GM", 1312 &i965_gtt_driver }, 1313 { PCI_DEVICE_ID_INTEL_82965GME_IG, "965GME/GLE", 1314 &i965_gtt_driver }, 1315 { PCI_DEVICE_ID_INTEL_G33_IG, "G33", 1316 &g33_gtt_driver }, 1317 { PCI_DEVICE_ID_INTEL_Q35_IG, "Q35", 1318 &g33_gtt_driver }, 1319 { PCI_DEVICE_ID_INTEL_Q33_IG, "Q33", 1320 &g33_gtt_driver }, 1321 { PCI_DEVICE_ID_INTEL_PINEVIEW_M_IG, "GMA3150", 1322 &pineview_gtt_driver }, 1323 { PCI_DEVICE_ID_INTEL_PINEVIEW_IG, "GMA3150", 1324 &pineview_gtt_driver }, 1325 { PCI_DEVICE_ID_INTEL_GM45_IG, "GM45", 1326 &g4x_gtt_driver }, 1327 { PCI_DEVICE_ID_INTEL_EAGLELAKE_IG, "Eaglelake", 1328 &g4x_gtt_driver }, 1329 { PCI_DEVICE_ID_INTEL_Q45_IG, "Q45/Q43", 1330 &g4x_gtt_driver }, 1331 { PCI_DEVICE_ID_INTEL_G45_IG, "G45/G43", 1332 &g4x_gtt_driver }, 1333 { PCI_DEVICE_ID_INTEL_B43_IG, "B43", 1334 &g4x_gtt_driver }, 1335 { PCI_DEVICE_ID_INTEL_B43_1_IG, "B43", 1336 &g4x_gtt_driver }, 1337 { PCI_DEVICE_ID_INTEL_G41_IG, "G41", 1338 &g4x_gtt_driver }, 1339 { PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG, 1340 "HD Graphics", &ironlake_gtt_driver }, 1341 { PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG, 1342 "HD Graphics", &ironlake_gtt_driver }, 1343 { 0, NULL, NULL } 1344}; 1345 1346static int find_gmch(u16 device) 1347{ 1348 struct pci_dev *gmch_device; 1349 1350 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL, device, NULL); 1351 if (gmch_device && PCI_FUNC(gmch_device->devfn) != 0) { 1352 gmch_device = pci_get_device(PCI_VENDOR_ID_INTEL, 1353 device, gmch_device); 1354 } 1355 1356 if (!gmch_device) 1357 return 0; 1358 1359 intel_private.pcidev = gmch_device; 1360 return 1; 1361} 1362 1363int intel_gmch_probe(struct pci_dev *bridge_pdev, struct pci_dev *gpu_pdev, 1364 struct agp_bridge_data *bridge) 1365{ 1366 int i, mask; 1367 1368 for (i = 0; intel_gtt_chipsets[i].name != NULL; i++) { 1369 if (gpu_pdev) { 1370 if (gpu_pdev->device == 1371 intel_gtt_chipsets[i].gmch_chip_id) { 1372 intel_private.pcidev = pci_dev_get(gpu_pdev); 1373 intel_private.driver = 1374 intel_gtt_chipsets[i].gtt_driver; 1375 1376 break; 1377 } 1378 } else if (find_gmch(intel_gtt_chipsets[i].gmch_chip_id)) { 1379 intel_private.driver = 1380 intel_gtt_chipsets[i].gtt_driver; 1381 break; 1382 } 1383 } 1384 1385 if (!intel_private.driver) 1386 return 0; 1387 1388#if IS_ENABLED(CONFIG_AGP_INTEL) 1389 if (bridge) { 1390 if (INTEL_GTT_GEN > 1) 1391 return 0; 1392 1393 bridge->driver = &intel_fake_agp_driver; 1394 bridge->dev_private_data = &intel_private; 1395 bridge->dev = bridge_pdev; 1396 } 1397#endif 1398 1399 1400 /* 1401 * Can be called from the fake agp driver but also directly from 1402 * drm/i915.ko. Hence we need to check whether everything is set up 1403 * already. 1404 */ 1405 if (intel_private.refcount++) 1406 return 1; 1407 1408 intel_private.bridge_dev = pci_dev_get(bridge_pdev); 1409 1410 dev_info(&bridge_pdev->dev, "Intel %s Chipset\n", intel_gtt_chipsets[i].name); 1411 1412 if (bridge) { 1413 mask = intel_private.driver->dma_mask_size; 1414 if (pci_set_dma_mask(intel_private.pcidev, DMA_BIT_MASK(mask))) 1415 dev_err(&intel_private.pcidev->dev, 1416 "set gfx device dma mask %d-bit failed!\n", 1417 mask); 1418 else 1419 pci_set_consistent_dma_mask(intel_private.pcidev, 1420 DMA_BIT_MASK(mask)); 1421 } 1422 1423 if (intel_gtt_init() != 0) { 1424 intel_gmch_remove(); 1425 1426 return 0; 1427 } 1428 1429 return 1; 1430} 1431EXPORT_SYMBOL(intel_gmch_probe); 1432 1433void intel_gtt_get(u64 *gtt_total, 1434 phys_addr_t *mappable_base, 1435 resource_size_t *mappable_end) 1436{ 1437 *gtt_total = intel_private.gtt_total_entries << PAGE_SHIFT; 1438 *mappable_base = intel_private.gma_bus_addr; 1439 *mappable_end = intel_private.gtt_mappable_entries << PAGE_SHIFT; 1440} 1441EXPORT_SYMBOL(intel_gtt_get); 1442 1443void intel_gtt_chipset_flush(void) 1444{ 1445 if (intel_private.driver->chipset_flush) 1446 intel_private.driver->chipset_flush(); 1447} 1448EXPORT_SYMBOL(intel_gtt_chipset_flush); 1449 1450void intel_gmch_remove(void) 1451{ 1452 if (--intel_private.refcount) 1453 return; 1454 1455 if (intel_private.scratch_page) 1456 intel_gtt_teardown_scratch_page(); 1457 if (intel_private.pcidev) 1458 pci_dev_put(intel_private.pcidev); 1459 if (intel_private.bridge_dev) 1460 pci_dev_put(intel_private.bridge_dev); 1461 intel_private.driver = NULL; 1462} 1463EXPORT_SYMBOL(intel_gmch_remove); 1464 1465MODULE_AUTHOR("Dave Jones, Various @Intel"); 1466MODULE_LICENSE("GPL and additional rights"); 1467