git.oblomov.eu Git - linux-2.6/blob - drivers/char/agp/generic.c

   1 /*
   2  * AGPGART driver.
   3  * Copyright (C) 2004 Silicon Graphics, Inc.
   4  * Copyright (C) 2002-2005 Dave Jones.
   5  * Copyright (C) 1999 Jeff Hartmann.
   6  * Copyright (C) 1999 Precision Insight, Inc.
   7  * Copyright (C) 1999 Xi Graphics, Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
  25  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * TODO:
  28  * - Allocate more than order 0 pages to avoid too much linear map splitting.
  29  */
  30 #include <linux/module.h>
  31 #include <linux/pci.h>
  32 #include <linux/init.h>
  33 #include <linux/pagemap.h>
  34 #include <linux/miscdevice.h>
  35 #include <linux/pm.h>
  36 #include <linux/agp_backend.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/dma-mapping.h>
  39 #include <linux/mm.h>
  40 #include <asm/io.h>
  41 #include <asm/cacheflush.h>
  42 #include <asm/pgtable.h>
  43 #include "agp.h"
  44
  45 __u32 *agp_gatt_table;
  46 int agp_memory_reserved;
  47
  48 /*
  49  * Needed by the Nforce GART driver for the time being. Would be
  50  * nice to do this some other way instead of needing this export.
  51  */
  52 EXPORT_SYMBOL_GPL(agp_memory_reserved);
  53
  54 #if defined(CONFIG_X86)
  55 int map_page_into_agp(struct page *page)
  56 {
  57         int i;
  58         i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
  59         /* Caller's responsibility to call global_flush_tlb() for
  60          * performance reasons */
  61         return i;
  62 }
  63 EXPORT_SYMBOL_GPL(map_page_into_agp);
  64
  65 int unmap_page_from_agp(struct page *page)
  66 {
  67         int i;
  68         i = change_page_attr(page, 1, PAGE_KERNEL);
  69         /* Caller's responsibility to call global_flush_tlb() for
  70          * performance reasons */
  71         return i;
  72 }
  73 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
  74 #endif
  75
  76 /*
  77  * Generic routines for handling agp_memory structures -
  78  * They use the basic page allocation routines to do the brunt of the work.
  79  */
  80
  81 void agp_free_key(int key)
  82 {
  83         if (key < 0)
  84                 return;
  85
  86         if (key < MAXKEY)
  87                 clear_bit(key, agp_bridge->key_list);
  88 }
  89 EXPORT_SYMBOL(agp_free_key);
  90
  91
  92 static int agp_get_key(void)
  93 {
  94         int bit;
  95
  96         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  97         if (bit < MAXKEY) {
  98                 set_bit(bit, agp_bridge->key_list);
  99                 return bit;
 100         }
 101         return -1;
 102 }
 103
 104 /*
 105  * Use kmalloc if possible for the page list. Otherwise fall back to
 106  * vmalloc. This speeds things up and also saves memory for small AGP
 107  * regions.
 108  */
 109
 110 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
 111 {
 112         mem->memory = NULL;
 113         mem->vmalloc_flag = 0;
 114
 115         if (size <= 2*PAGE_SIZE)
 116                 mem->memory = kmalloc(size, GFP_KERNEL | __GFP_NORETRY);
 117         if (mem->memory == NULL) {
 118                 mem->memory = vmalloc(size);
 119                 mem->vmalloc_flag = 1;
 120         }
 121 }
 122 EXPORT_SYMBOL(agp_alloc_page_array);
 123
 124 void agp_free_page_array(struct agp_memory *mem)
 125 {
 126         if (mem->vmalloc_flag) {
 127                 vfree(mem->memory);
 128         } else {
 129                 kfree(mem->memory);
 130         }
 131 }
 132 EXPORT_SYMBOL(agp_free_page_array);
 133
 134
 135 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
 136 {
 137         struct agp_memory *new;
 138         unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
 139
 140         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 141         if (new == NULL)
 142                 return NULL;
 143
 144         new->key = agp_get_key();
 145
 146         if (new->key < 0) {
 147                 kfree(new);
 148                 return NULL;
 149         }
 150
 151         agp_alloc_page_array(alloc_size, new);
 152
 153         if (new->memory == NULL) {
 154                 agp_free_key(new->key);
 155                 kfree(new);
 156                 return NULL;
 157         }
 158         new->num_scratch_pages = 0;
 159         return new;
 160 }
 161
 162 struct agp_memory *agp_create_memory(int scratch_pages)
 163 {
 164         struct agp_memory *new;
 165
 166         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 167         if (new == NULL)
 168                 return NULL;
 169
 170         new->key = agp_get_key();
 171
 172         if (new->key < 0) {
 173                 kfree(new);
 174                 return NULL;
 175         }
 176
 177         agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
 178
 179         if (new->memory == NULL) {
 180                 agp_free_key(new->key);
 181                 kfree(new);
 182                 return NULL;
 183         }
 184         new->num_scratch_pages = scratch_pages;
 185         new->type = AGP_NORMAL_MEMORY;
 186         return new;
 187 }
 188 EXPORT_SYMBOL(agp_create_memory);
 189
 190 /**
 191  *      agp_free_memory - free memory associated with an agp_memory pointer.
 192  *
 193  *      @curr:          agp_memory pointer to be freed.
 194  *
 195  *      It is the only function that can be called when the backend is not owned
 196  *      by the caller.  (So it can free memory on client death.)
 197  */
 198 void agp_free_memory(struct agp_memory *curr)
 199 {
 200         size_t i;
 201
 202         if (curr == NULL)
 203                 return;
 204
 205         if (curr->is_bound == TRUE)
 206                 agp_unbind_memory(curr);
 207
 208         if (curr->type >= AGP_USER_TYPES) {
 209                 agp_generic_free_by_type(curr);
 210                 return;
 211         }
 212
 213         if (curr->type != 0) {
 214                 curr->bridge->driver->free_by_type(curr);
 215                 return;
 216         }
 217         if (curr->page_count != 0) {
 218                 for (i = 0; i < curr->page_count; i++) {
 219                         curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
 220                 }
 221                 flush_agp_mappings();
 222         }
 223         agp_free_key(curr->key);
 224         agp_free_page_array(curr);
 225         kfree(curr);
 226 }
 227 EXPORT_SYMBOL(agp_free_memory);
 228
 229 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 230
 231 /**
 232  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 233  *
 234  *      @page_count:    size_t argument of the number of pages
 235  *      @type:  u32 argument of the type of memory to be allocated.
 236  *
 237  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 238  *      maps to physical ram.  Any other type is device dependent.
 239  *
 240  *      It returns NULL whenever memory is unavailable.
 241  */
 242 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 243                                         size_t page_count, u32 type)
 244 {
 245         int scratch_pages;
 246         struct agp_memory *new;
 247         size_t i;
 248
 249         if (!bridge)
 250                 return NULL;
 251
 252         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
 253                 return NULL;
 254
 255         if (type >= AGP_USER_TYPES) {
 256                 new = agp_generic_alloc_user(page_count, type);
 257                 if (new)
 258                         new->bridge = bridge;
 259                 return new;
 260         }
 261
 262         if (type != 0) {
 263                 new = bridge->driver->alloc_by_type(page_count, type);
 264                 if (new)
 265                         new->bridge = bridge;
 266                 return new;
 267         }
 268
 269         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 270
 271         new = agp_create_memory(scratch_pages);
 272
 273         if (new == NULL)
 274                 return NULL;
 275
 276         for (i = 0; i < page_count; i++) {
 277                 void *addr = bridge->driver->agp_alloc_page(bridge);
 278
 279                 if (addr == NULL) {
 280                         agp_free_memory(new);
 281                         return NULL;
 282                 }
 283                 new->memory[i] = virt_to_gart(addr);
 284                 new->page_count++;
 285         }
 286         new->bridge = bridge;
 287
 288         flush_agp_mappings();
 289
 290         return new;
 291 }
 292 EXPORT_SYMBOL(agp_allocate_memory);
 293
 294
 295 /* End - Generic routines for handling agp_memory structures */
 296
 297
 298 static int agp_return_size(void)
 299 {
 300         int current_size;
 301         void *temp;
 302
 303         temp = agp_bridge->current_size;
 304
 305         switch (agp_bridge->driver->size_type) {
 306         case U8_APER_SIZE:
 307                 current_size = A_SIZE_8(temp)->size;
 308                 break;
 309         case U16_APER_SIZE:
 310                 current_size = A_SIZE_16(temp)->size;
 311                 break;
 312         case U32_APER_SIZE:
 313                 current_size = A_SIZE_32(temp)->size;
 314                 break;
 315         case LVL2_APER_SIZE:
 316                 current_size = A_SIZE_LVL2(temp)->size;
 317                 break;
 318         case FIXED_APER_SIZE:
 319                 current_size = A_SIZE_FIX(temp)->size;
 320                 break;
 321         default:
 322                 current_size = 0;
 323                 break;
 324         }
 325
 326         current_size -= (agp_memory_reserved / (1024*1024));
 327         if (current_size <0)
 328                 current_size = 0;
 329         return current_size;
 330 }
 331
 332
 333 int agp_num_entries(void)
 334 {
 335         int num_entries;
 336         void *temp;
 337
 338         temp = agp_bridge->current_size;
 339
 340         switch (agp_bridge->driver->size_type) {
 341         case U8_APER_SIZE:
 342                 num_entries = A_SIZE_8(temp)->num_entries;
 343                 break;
 344         case U16_APER_SIZE:
 345                 num_entries = A_SIZE_16(temp)->num_entries;
 346                 break;
 347         case U32_APER_SIZE:
 348                 num_entries = A_SIZE_32(temp)->num_entries;
 349                 break;
 350         case LVL2_APER_SIZE:
 351                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 352                 break;
 353         case FIXED_APER_SIZE:
 354                 num_entries = A_SIZE_FIX(temp)->num_entries;
 355                 break;
 356         default:
 357                 num_entries = 0;
 358                 break;
 359         }
 360
 361         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 362         if (num_entries<0)
 363                 num_entries = 0;
 364         return num_entries;
 365 }
 366 EXPORT_SYMBOL_GPL(agp_num_entries);
 367
 368
 369 /**
 370  *      agp_copy_info  -  copy bridge state information
 371  *
 372  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 373  *
 374  *      This function copies information about the agp bridge device and the state of
 375  *      the agp backend into an agp_kern_info pointer.
 376  */
 377 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 378 {
 379         memset(info, 0, sizeof(struct agp_kern_info));
 380         if (!bridge) {
 381                 info->chipset = NOT_SUPPORTED;
 382                 return -EIO;
 383         }
 384
 385         info->version.major = bridge->version->major;
 386         info->version.minor = bridge->version->minor;
 387         info->chipset = SUPPORTED;
 388         info->device = bridge->dev;
 389         if (bridge->mode & AGPSTAT_MODE_3_0)
 390                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 391         else
 392                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 393         info->aper_base = bridge->gart_bus_addr;
 394         info->aper_size = agp_return_size();
 395         info->max_memory = bridge->max_memory_agp;
 396         info->current_memory = atomic_read(&bridge->current_memory_agp);
 397         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 398         info->vm_ops = bridge->vm_ops;
 399         info->page_mask = ~0UL;
 400         return 0;
 401 }
 402 EXPORT_SYMBOL(agp_copy_info);
 403
 404 /* End - Routine to copy over information structure */
 405
 406 /*
 407  * Routines for handling swapping of agp_memory into the GATT -
 408  * These routines take agp_memory and insert them into the GATT.
 409  * They call device specific routines to actually write to the GATT.
 410  */
 411
 412 /**
 413  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 414  *
 415  *      @curr:          agp_memory pointer
 416  *      @pg_start:      an offset into the graphics aperture translation table
 417  *
 418  *      It returns -EINVAL if the pointer == NULL.
 419  *      It returns -EBUSY if the area of the table requested is already in use.
 420  */
 421 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 422 {
 423         int ret_val;
 424
 425         if (curr == NULL)
 426                 return -EINVAL;
 427
 428         if (curr->is_bound == TRUE) {
 429                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
 430                 return -EINVAL;
 431         }
 432         if (curr->is_flushed == FALSE) {
 433                 curr->bridge->driver->cache_flush();
 434                 curr->is_flushed = TRUE;
 435         }
 436         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 437
 438         if (ret_val != 0)
 439                 return ret_val;
 440
 441         curr->is_bound = TRUE;
 442         curr->pg_start = pg_start;
 443         return 0;
 444 }
 445 EXPORT_SYMBOL(agp_bind_memory);
 446
 447
 448 /**
 449  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 450  *
 451  * @curr:       agp_memory pointer to be removed from the GATT.
 452  *
 453  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 454  * the graphics aperture translation table or if the agp_memory pointer == NULL
 455  */
 456 int agp_unbind_memory(struct agp_memory *curr)
 457 {
 458         int ret_val;
 459
 460         if (curr == NULL)
 461                 return -EINVAL;
 462
 463         if (curr->is_bound != TRUE) {
 464                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
 465                 return -EINVAL;
 466         }
 467
 468         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 469
 470         if (ret_val != 0)
 471                 return ret_val;
 472
 473         curr->is_bound = FALSE;
 474         curr->pg_start = 0;
 475         return 0;
 476 }
 477 EXPORT_SYMBOL(agp_unbind_memory);
 478
 479 /* End - Routines for handling swapping of agp_memory into the GATT */
 480
 481
 482 /* Generic Agp routines - Start */
 483 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 484 {
 485         u32 tmp;
 486
 487         if (*requested_mode & AGP2_RESERVED_MASK) {
 488                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 489                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
 490                 *requested_mode &= ~AGP2_RESERVED_MASK;
 491         }
 492
 493         /*
 494          * Some dumb bridges are programmed to disobey the AGP2 spec.
 495          * This is likely a BIOS misprogramming rather than poweron default, or
 496          * it would be a lot more common.
 497          * https://bugs.freedesktop.org/show_bug.cgi?id=8816
 498          * AGPv2 spec 6.1.9 states:
 499          *   The RATE field indicates the data transfer rates supported by this
 500          *   device. A.G.P. devices must report all that apply.
 501          * Fix them up as best we can.
 502          */
 503         switch (*bridge_agpstat & 7) {
 504         case 4:
 505                 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
 506                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
 507                         "Fixing up support for x2 & x1\n");
 508                 break;
 509         case 2:
 510                 *bridge_agpstat |= AGPSTAT2_1X;
 511                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
 512                         "Fixing up support for x1\n");
 513                 break;
 514         default:
 515                 break;
 516         }
 517
 518         /* Check the speed bits make sense. Only one should be set. */
 519         tmp = *requested_mode & 7;
 520         switch (tmp) {
 521                 case 0:
 522                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 523                         *requested_mode |= AGPSTAT2_1X;
 524                         break;
 525                 case 1:
 526                 case 2:
 527                         break;
 528                 case 3:
 529                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 530                         break;
 531                 case 4:
 532                         break;
 533                 case 5:
 534                 case 6:
 535                 case 7:
 536                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 537                         break;
 538         }
 539
 540         /* disable SBA if it's not supported */
 541         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 542                 *bridge_agpstat &= ~AGPSTAT_SBA;
 543
 544         /* Set rate */
 545         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 546                 *bridge_agpstat &= ~AGPSTAT2_4X;
 547
 548         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 549                 *bridge_agpstat &= ~AGPSTAT2_2X;
 550
 551         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 552                 *bridge_agpstat &= ~AGPSTAT2_1X;
 553
 554         /* Now we know what mode it should be, clear out the unwanted bits. */
 555         if (*bridge_agpstat & AGPSTAT2_4X)
 556                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 557
 558         if (*bridge_agpstat & AGPSTAT2_2X)
 559                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 560
 561         if (*bridge_agpstat & AGPSTAT2_1X)
 562                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 563
 564         /* Apply any errata. */
 565         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 566                 *bridge_agpstat &= ~AGPSTAT_FW;
 567
 568         if (agp_bridge->flags & AGP_ERRATA_SBA)
 569                 *bridge_agpstat &= ~AGPSTAT_SBA;
 570
 571         if (agp_bridge->flags & AGP_ERRATA_1X) {
 572                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 573                 *bridge_agpstat |= AGPSTAT2_1X;
 574         }
 575
 576         /* If we've dropped down to 1X, disable fast writes. */
 577         if (*bridge_agpstat & AGPSTAT2_1X)
 578                 *bridge_agpstat &= ~AGPSTAT_FW;
 579 }
 580
 581 /*
 582  * requested_mode = Mode requested by (typically) X.
 583  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 584  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 585  */
 586 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 587 {
 588         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 589         u32 tmp;
 590
 591         if (*requested_mode & AGP3_RESERVED_MASK) {
 592                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 593                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
 594                 *requested_mode &= ~AGP3_RESERVED_MASK;
 595         }
 596
 597         /* Check the speed bits make sense. */
 598         tmp = *requested_mode & 7;
 599         if (tmp == 0) {
 600                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 601                 *requested_mode |= AGPSTAT3_4X;
 602         }
 603         if (tmp >= 3) {
 604                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 605                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 606         }
 607
 608         /* ARQSZ - Set the value to the maximum one.
 609          * Don't allow the mode register to override values. */
 610         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 611                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 612
 613         /* Calibration cycle.
 614          * Don't allow the mode register to override values. */
 615         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 616                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 617
 618         /* SBA *must* be supported for AGP v3 */
 619         *bridge_agpstat |= AGPSTAT_SBA;
 620
 621         /*
 622          * Set speed.
 623          * Check for invalid speeds. This can happen when applications
 624          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 625          */
 626         if (*requested_mode & AGPSTAT_MODE_3_0) {
 627                 /*
 628                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 629                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 630                  * AGP2.x 4x -> AGP3.0 4x.
 631                  */
 632                 if (*requested_mode & AGPSTAT2_4X) {
 633                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 634                                                 current->comm, *requested_mode);
 635                         *requested_mode &= ~AGPSTAT2_4X;
 636                         *requested_mode |= AGPSTAT3_4X;
 637                 }
 638         } else {
 639                 /*
 640                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 641                  * but have been passed an AGP 2.x mode.
 642                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 643                  */
 644                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 645                                         current->comm, *requested_mode);
 646                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 647                 *requested_mode |= AGPSTAT3_4X;
 648         }
 649
 650         if (*requested_mode & AGPSTAT3_8X) {
 651                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 652                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 653                         *bridge_agpstat |= AGPSTAT3_4X;
 654                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
 655                         return;
 656                 }
 657                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 658                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 659                         *bridge_agpstat |= AGPSTAT3_4X;
 660                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
 661                         return;
 662                 }
 663                 /* All set, bridge & device can do AGP x8*/
 664                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 665                 goto done;
 666
 667         } else if (*requested_mode & AGPSTAT3_4X) {
 668                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 669                 *bridge_agpstat |= AGPSTAT3_4X;
 670                 goto done;
 671
 672         } else {
 673
 674                 /*
 675                  * If we didn't specify an AGP mode, we see if both
 676                  * the graphics card, and the bridge can do x8, and use if so.
 677                  * If not, we fall back to x4 mode.
 678                  */
 679                 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
 680                         printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
 681                                 "supported by bridge & card (x8).\n");
 682                         *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 683                         *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 684                 } else {
 685                         printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
 686                         if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 687                                 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
 688                                         *bridge_agpstat, origbridge);
 689                                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 690                                 *bridge_agpstat |= AGPSTAT3_4X;
 691                         }
 692                         if (!(*vga_agpstat & AGPSTAT3_8X)) {
 693                                 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
 694                                         *vga_agpstat, origvga);
 695                                 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 696                                 *vga_agpstat |= AGPSTAT3_4X;
 697                         }
 698                 }
 699         }
 700
 701 done:
 702         /* Apply any errata. */
 703         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 704                 *bridge_agpstat &= ~AGPSTAT_FW;
 705
 706         if (agp_bridge->flags & AGP_ERRATA_SBA)
 707                 *bridge_agpstat &= ~AGPSTAT_SBA;
 708
 709         if (agp_bridge->flags & AGP_ERRATA_1X) {
 710                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 711                 *bridge_agpstat |= AGPSTAT2_1X;
 712         }
 713 }
 714
 715
 716 /**
 717  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 718  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 719  * @requested_mode: requested agp_stat from userspace (Typically from X)
 720  * @bridge_agpstat: current agp_stat from AGP bridge.
 721  *
 722  * This function will hunt for an AGP graphics card, and try to match
 723  * the requested mode to the capabilities of both the bridge and the card.
 724  */
 725 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 726 {
 727         struct pci_dev *device = NULL;
 728         u32 vga_agpstat;
 729         u8 cap_ptr;
 730
 731         for (;;) {
 732                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 733                 if (!device) {
 734                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 735                         return 0;
 736                 }
 737                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 738                 if (cap_ptr)
 739                         break;
 740         }
 741
 742         /*
 743          * Ok, here we have a AGP device. Disable impossible
 744          * settings, and adjust the readqueue to the minimum.
 745          */
 746         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 747
 748         /* adjust RQ depth */
 749         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 750              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 751                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 752
 753         /* disable FW if it's not supported */
 754         if (!((bridge_agpstat & AGPSTAT_FW) &&
 755                  (vga_agpstat & AGPSTAT_FW) &&
 756                  (requested_mode & AGPSTAT_FW)))
 757                 bridge_agpstat &= ~AGPSTAT_FW;
 758
 759         /* Check to see if we are operating in 3.0 mode */
 760         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 761                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 762         else
 763                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 764
 765         pci_dev_put(device);
 766         return bridge_agpstat;
 767 }
 768 EXPORT_SYMBOL(agp_collect_device_status);
 769
 770
 771 void agp_device_command(u32 bridge_agpstat, int agp_v3)
 772 {
 773         struct pci_dev *device = NULL;
 774         int mode;
 775
 776         mode = bridge_agpstat & 0x7;
 777         if (agp_v3)
 778                 mode *= 4;
 779
 780         for_each_pci_dev(device) {
 781                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 782                 if (!agp)
 783                         continue;
 784
 785                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
 786                                 agp_v3 ? 3 : 2, pci_name(device), mode);
 787                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 788         }
 789 }
 790 EXPORT_SYMBOL(agp_device_command);
 791
 792
 793 void get_agp_version(struct agp_bridge_data *bridge)
 794 {
 795         u32 ncapid;
 796
 797         /* Exit early if already set by errata workarounds. */
 798         if (bridge->major_version != 0)
 799                 return;
 800
 801         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 802         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 803         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 804 }
 805 EXPORT_SYMBOL(get_agp_version);
 806
 807
 808 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 809 {
 810         u32 bridge_agpstat, temp;
 811
 812         get_agp_version(agp_bridge);
 813
 814         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
 815                                 agp_bridge->major_version,
 816                                 agp_bridge->minor_version,
 817                                 pci_name(agp_bridge->dev));
 818
 819         pci_read_config_dword(agp_bridge->dev,
 820                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 821
 822         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 823         if (bridge_agpstat == 0)
 824                 /* Something bad happened. FIXME: Return error code? */
 825                 return;
 826
 827         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 828
 829         /* Do AGP version specific frobbing. */
 830         if (bridge->major_version >= 3) {
 831                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 832                         /* If we have 3.5, we can do the isoch stuff. */
 833                         if (bridge->minor_version >= 5)
 834                                 agp_3_5_enable(bridge);
 835                         agp_device_command(bridge_agpstat, TRUE);
 836                         return;
 837                 } else {
 838                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 839                     bridge_agpstat &= ~(7<<10) ;
 840                     pci_read_config_dword(bridge->dev,
 841                                         bridge->capndx+AGPCTRL, &temp);
 842                     temp |= (1<<9);
 843                     pci_write_config_dword(bridge->dev,
 844                                         bridge->capndx+AGPCTRL, temp);
 845
 846                     printk(KERN_INFO PFX "Device is in legacy mode,"
 847                                 " falling back to 2.x\n");
 848                 }
 849         }
 850
 851         /* AGP v<3 */
 852         agp_device_command(bridge_agpstat, FALSE);
 853 }
 854 EXPORT_SYMBOL(agp_generic_enable);
 855
 856
 857 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 858 {
 859         char *table;
 860         char *table_end;
 861         int size;
 862         int page_order;
 863         int num_entries;
 864         int i;
 865         void *temp;
 866         struct page *page;
 867
 868         /* The generic routines can't handle 2 level gatt's */
 869         if (bridge->driver->size_type == LVL2_APER_SIZE)
 870                 return -EINVAL;
 871
 872         table = NULL;
 873         i = bridge->aperture_size_idx;
 874         temp = bridge->current_size;
 875         size = page_order = num_entries = 0;
 876
 877         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 878                 do {
 879                         switch (bridge->driver->size_type) {
 880                         case U8_APER_SIZE:
 881                                 size = A_SIZE_8(temp)->size;
 882                                 page_order =
 883                                     A_SIZE_8(temp)->page_order;
 884                                 num_entries =
 885                                     A_SIZE_8(temp)->num_entries;
 886                                 break;
 887                         case U16_APER_SIZE:
 888                                 size = A_SIZE_16(temp)->size;
 889                                 page_order = A_SIZE_16(temp)->page_order;
 890                                 num_entries = A_SIZE_16(temp)->num_entries;
 891                                 break;
 892                         case U32_APER_SIZE:
 893                                 size = A_SIZE_32(temp)->size;
 894                                 page_order = A_SIZE_32(temp)->page_order;
 895                                 num_entries = A_SIZE_32(temp)->num_entries;
 896                                 break;
 897                                 /* This case will never really happen. */
 898                         case FIXED_APER_SIZE:
 899                         case LVL2_APER_SIZE:
 900                         default:
 901                                 size = page_order = num_entries = 0;
 902                                 break;
 903                         }
 904
 905                         table = alloc_gatt_pages(page_order);
 906
 907                         if (table == NULL) {
 908                                 i++;
 909                                 switch (bridge->driver->size_type) {
 910                                 case U8_APER_SIZE:
 911                                         bridge->current_size = A_IDX8(bridge);
 912                                         break;
 913                                 case U16_APER_SIZE:
 914                                         bridge->current_size = A_IDX16(bridge);
 915                                         break;
 916                                 case U32_APER_SIZE:
 917                                         bridge->current_size = A_IDX32(bridge);
 918                                         break;
 919                                 /* These cases will never really happen. */
 920                                 case FIXED_APER_SIZE:
 921                                 case LVL2_APER_SIZE:
 922                                 default:
 923                                         break;
 924                                 }
 925                                 temp = bridge->current_size;
 926                         } else {
 927                                 bridge->aperture_size_idx = i;
 928                         }
 929                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 930         } else {
 931                 size = ((struct aper_size_info_fixed *) temp)->size;
 932                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 933                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 934                 table = alloc_gatt_pages(page_order);
 935         }
 936
 937         if (table == NULL)
 938                 return -ENOMEM;
 939
 940         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 941
 942         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 943                 SetPageReserved(page);
 944
 945         bridge->gatt_table_real = (u32 *) table;
 946         agp_gatt_table = (void *)table;
 947
 948         bridge->driver->cache_flush();
 949         bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
 950                                         (PAGE_SIZE * (1 << page_order)));
 951         bridge->driver->cache_flush();
 952
 953         if (bridge->gatt_table == NULL) {
 954                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 955                         ClearPageReserved(page);
 956
 957                 free_gatt_pages(table, page_order);
 958
 959                 return -ENOMEM;
 960         }
 961         bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
 962
 963         /* AK: bogus, should encode addresses > 4GB */
 964         for (i = 0; i < num_entries; i++) {
 965                 writel(bridge->scratch_page, bridge->gatt_table+i);
 966                 readl(bridge->gatt_table+i);    /* PCI Posting. */
 967         }
 968
 969         return 0;
 970 }
 971 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 972
 973 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
 974 {
 975         int page_order;
 976         char *table, *table_end;
 977         void *temp;
 978         struct page *page;
 979
 980         temp = bridge->current_size;
 981
 982         switch (bridge->driver->size_type) {
 983         case U8_APER_SIZE:
 984                 page_order = A_SIZE_8(temp)->page_order;
 985                 break;
 986         case U16_APER_SIZE:
 987                 page_order = A_SIZE_16(temp)->page_order;
 988                 break;
 989         case U32_APER_SIZE:
 990                 page_order = A_SIZE_32(temp)->page_order;
 991                 break;
 992         case FIXED_APER_SIZE:
 993                 page_order = A_SIZE_FIX(temp)->page_order;
 994                 break;
 995         case LVL2_APER_SIZE:
 996                 /* The generic routines can't deal with 2 level gatt's */
 997                 return -EINVAL;
 998                 break;
 999         default:
1000                 page_order = 0;
1001                 break;
1002         }
1003
1004         /* Do not worry about freeing memory, because if this is
1005          * called, then all agp memory is deallocated and removed
1006          * from the table. */
1007
1008         iounmap(bridge->gatt_table);
1009         table = (char *) bridge->gatt_table_real;
1010         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1011
1012         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1013                 ClearPageReserved(page);
1014
1015         free_gatt_pages(bridge->gatt_table_real, page_order);
1016
1017         agp_gatt_table = NULL;
1018         bridge->gatt_table = NULL;
1019         bridge->gatt_table_real = NULL;
1020         bridge->gatt_bus_addr = 0;
1021
1022         return 0;
1023 }
1024 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1025
1026
1027 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1028 {
1029         int num_entries;
1030         size_t i;
1031         off_t j;
1032         void *temp;
1033         struct agp_bridge_data *bridge;
1034         int mask_type;
1035
1036         bridge = mem->bridge;
1037         if (!bridge)
1038                 return -EINVAL;
1039
1040         if (mem->page_count == 0)
1041                 return 0;
1042
1043         temp = bridge->current_size;
1044
1045         switch (bridge->driver->size_type) {
1046         case U8_APER_SIZE:
1047                 num_entries = A_SIZE_8(temp)->num_entries;
1048                 break;
1049         case U16_APER_SIZE:
1050                 num_entries = A_SIZE_16(temp)->num_entries;
1051                 break;
1052         case U32_APER_SIZE:
1053                 num_entries = A_SIZE_32(temp)->num_entries;
1054                 break;
1055         case FIXED_APER_SIZE:
1056                 num_entries = A_SIZE_FIX(temp)->num_entries;
1057                 break;
1058         case LVL2_APER_SIZE:
1059                 /* The generic routines can't deal with 2 level gatt's */
1060                 return -EINVAL;
1061                 break;
1062         default:
1063                 num_entries = 0;
1064                 break;
1065         }
1066
1067         num_entries -= agp_memory_reserved/PAGE_SIZE;
1068         if (num_entries < 0) num_entries = 0;
1069
1070         if (type != mem->type)
1071                 return -EINVAL;
1072
1073         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1074         if (mask_type != 0) {
1075                 /* The generic routines know nothing of memory types */
1076                 return -EINVAL;
1077         }
1078
1079         /* AK: could wrap */
1080         if ((pg_start + mem->page_count) > num_entries)
1081                 return -EINVAL;
1082
1083         j = pg_start;
1084
1085         while (j < (pg_start + mem->page_count)) {
1086                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1087                         return -EBUSY;
1088                 j++;
1089         }
1090
1091         if (mem->is_flushed == FALSE) {
1092                 bridge->driver->cache_flush();
1093                 mem->is_flushed = TRUE;
1094         }
1095
1096         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1097                 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mask_type),
1098                        bridge->gatt_table+j);
1099         }
1100         readl(bridge->gatt_table+j-1);  /* PCI Posting. */
1101
1102         bridge->driver->tlb_flush(mem);
1103         return 0;
1104 }
1105 EXPORT_SYMBOL(agp_generic_insert_memory);
1106
1107
1108 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1109 {
1110         size_t i;
1111         struct agp_bridge_data *bridge;
1112         int mask_type;
1113
1114         bridge = mem->bridge;
1115         if (!bridge)
1116                 return -EINVAL;
1117
1118         if (mem->page_count == 0)
1119                 return 0;
1120
1121         if (type != mem->type)
1122                 return -EINVAL;
1123
1124         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1125         if (mask_type != 0) {
1126                 /* The generic routines know nothing of memory types */
1127                 return -EINVAL;
1128         }
1129
1130         /* AK: bogus, should encode addresses > 4GB */
1131         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1132                 writel(bridge->scratch_page, bridge->gatt_table+i);
1133         }
1134         readl(bridge->gatt_table+i-1);  /* PCI Posting. */
1135
1136         bridge->driver->tlb_flush(mem);
1137         return 0;
1138 }
1139 EXPORT_SYMBOL(agp_generic_remove_memory);
1140
1141 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1142 {
1143         return NULL;
1144 }
1145 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1146
1147 void agp_generic_free_by_type(struct agp_memory *curr)
1148 {
1149         agp_free_page_array(curr);
1150         agp_free_key(curr->key);
1151         kfree(curr);
1152 }
1153 EXPORT_SYMBOL(agp_generic_free_by_type);
1154
1155 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1156 {
1157         struct agp_memory *new;
1158         int i;
1159         int pages;
1160
1161         pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1162         new = agp_create_user_memory(page_count);
1163         if (new == NULL)
1164                 return NULL;
1165
1166         for (i = 0; i < page_count; i++)
1167                 new->memory[i] = 0;
1168         new->page_count = 0;
1169         new->type = type;
1170         new->num_scratch_pages = pages;
1171
1172         return new;
1173 }
1174 EXPORT_SYMBOL(agp_generic_alloc_user);
1175
1176 /*
1177  * Basic Page Allocation Routines -
1178  * These routines handle page allocation and by default they reserve the allocated
1179  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1180  * against a maximum value.
1181  */
1182
1183 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1184 {
1185         struct page * page;
1186
1187         page = alloc_page(GFP_KERNEL | GFP_DMA32);
1188         if (page == NULL)
1189                 return NULL;
1190
1191         map_page_into_agp(page);
1192
1193         get_page(page);
1194         SetPageLocked(page);
1195         atomic_inc(&agp_bridge->current_memory_agp);
1196         return page_address(page);
1197 }
1198 EXPORT_SYMBOL(agp_generic_alloc_page);
1199
1200
1201 void agp_generic_destroy_page(void *addr)
1202 {
1203         struct page *page;
1204
1205         if (addr == NULL)
1206                 return;
1207
1208         page = virt_to_page(addr);
1209         unmap_page_from_agp(page);
1210         put_page(page);
1211         unlock_page(page);
1212         free_page((unsigned long)addr);
1213         atomic_dec(&agp_bridge->current_memory_agp);
1214 }
1215 EXPORT_SYMBOL(agp_generic_destroy_page);
1216
1217 /* End Basic Page Allocation Routines */
1218
1219
1220 /**
1221  * agp_enable  -  initialise the agp point-to-point connection.
1222  *
1223  * @mode:       agp mode register value to configure with.
1224  */
1225 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1226 {
1227         if (!bridge)
1228                 return;
1229         bridge->driver->agp_enable(bridge, mode);
1230 }
1231 EXPORT_SYMBOL(agp_enable);
1232
1233 /* When we remove the global variable agp_bridge from all drivers
1234  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1235  */
1236
1237 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1238 {
1239         if (list_empty(&agp_bridges))
1240                 return NULL;
1241
1242         return agp_bridge;
1243 }
1244
1245 static void ipi_handler(void *null)
1246 {
1247         flush_agp_cache();
1248 }
1249
1250 void global_cache_flush(void)
1251 {
1252         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1253                 panic(PFX "timed out waiting for the other CPUs!\n");
1254 }
1255 EXPORT_SYMBOL(global_cache_flush);
1256
1257 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1258         unsigned long addr, int type)
1259 {
1260         /* memory type is ignored in the generic routine */
1261         if (bridge->driver->masks)
1262                 return addr | bridge->driver->masks[0].mask;
1263         else
1264                 return addr;
1265 }
1266 EXPORT_SYMBOL(agp_generic_mask_memory);
1267
1268 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1269                                   int type)
1270 {
1271         if (type >= AGP_USER_TYPES)
1272                 return 0;
1273         return type;
1274 }
1275 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1276
1277 /*
1278  * These functions are implemented according to the AGPv3 spec,
1279  * which covers implementation details that had previously been
1280  * left open.
1281  */
1282
1283 int agp3_generic_fetch_size(void)
1284 {
1285         u16 temp_size;
1286         int i;
1287         struct aper_size_info_16 *values;
1288
1289         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1290         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1291
1292         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1293                 if (temp_size == values[i].size_value) {
1294                         agp_bridge->previous_size =
1295                                 agp_bridge->current_size = (void *) (values + i);
1296
1297                         agp_bridge->aperture_size_idx = i;
1298                         return values[i].size;
1299                 }
1300         }
1301         return 0;
1302 }
1303 EXPORT_SYMBOL(agp3_generic_fetch_size);
1304
1305 void agp3_generic_tlbflush(struct agp_memory *mem)
1306 {
1307         u32 ctrl;
1308         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1309         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1310         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1311 }
1312 EXPORT_SYMBOL(agp3_generic_tlbflush);
1313
1314 int agp3_generic_configure(void)
1315 {
1316         u32 temp;
1317         struct aper_size_info_16 *current_size;
1318
1319         current_size = A_SIZE_16(agp_bridge->current_size);
1320
1321         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1322         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1323
1324         /* set aperture size */
1325         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1326         /* set gart pointer */
1327         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1328         /* enable aperture and GTLB */
1329         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1330         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1331         return 0;
1332 }
1333 EXPORT_SYMBOL(agp3_generic_configure);
1334
1335 void agp3_generic_cleanup(void)
1336 {
1337         u32 ctrl;
1338         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1339         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1340 }
1341 EXPORT_SYMBOL(agp3_generic_cleanup);
1342
1343 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1344 {
1345         {4096, 1048576, 10,0x000},
1346         {2048,  524288, 9, 0x800},
1347         {1024,  262144, 8, 0xc00},
1348         { 512,  131072, 7, 0xe00},
1349         { 256,   65536, 6, 0xf00},
1350         { 128,   32768, 5, 0xf20},
1351         {  64,   16384, 4, 0xf30},
1352         {  32,    8192, 3, 0xf38},
1353         {  16,    4096, 2, 0xf3c},
1354         {   8,    2048, 1, 0xf3e},
1355         {   4,    1024, 0, 0xf3f}
1356 };
1357 EXPORT_SYMBOL(agp3_generic_sizes);
1358