Pileus Git - ~andy/linux/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 <linux/sched.h>
  41 #include <linux/slab.h>
  42 #include <asm/io.h>
  43 #include <asm/cacheflush.h>
  44 #include <asm/pgtable.h>
  45 #include "agp.h"
  46
  47 __u32 *agp_gatt_table;
  48 int agp_memory_reserved;
  49
  50 /*
  51  * Needed by the Nforce GART driver for the time being. Would be
  52  * nice to do this some other way instead of needing this export.
  53  */
  54 EXPORT_SYMBOL_GPL(agp_memory_reserved);
  55
  56 /*
  57  * Generic routines for handling agp_memory structures -
  58  * They use the basic page allocation routines to do the brunt of the work.
  59  */
  60
  61 void agp_free_key(int key)
  62 {
  63         if (key < 0)
  64                 return;
  65
  66         if (key < MAXKEY)
  67                 clear_bit(key, agp_bridge->key_list);
  68 }
  69 EXPORT_SYMBOL(agp_free_key);
  70
  71
  72 static int agp_get_key(void)
  73 {
  74         int bit;
  75
  76         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  77         if (bit < MAXKEY) {
  78                 set_bit(bit, agp_bridge->key_list);
  79                 return bit;
  80         }
  81         return -1;
  82 }
  83
  84 /*
  85  * Use kmalloc if possible for the page list. Otherwise fall back to
  86  * vmalloc. This speeds things up and also saves memory for small AGP
  87  * regions.
  88  */
  89
  90 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
  91 {
  92         mem->pages = NULL;
  93
  94         if (size <= 2*PAGE_SIZE)
  95                 mem->pages = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
  96         if (mem->pages == NULL) {
  97                 mem->pages = vmalloc(size);
  98         }
  99 }
 100 EXPORT_SYMBOL(agp_alloc_page_array);
 101
 102 void agp_free_page_array(struct agp_memory *mem)
 103 {
 104         if (is_vmalloc_addr(mem->pages)) {
 105                 vfree(mem->pages);
 106         } else {
 107                 kfree(mem->pages);
 108         }
 109 }
 110 EXPORT_SYMBOL(agp_free_page_array);
 111
 112
 113 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
 114 {
 115         struct agp_memory *new;
 116         unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
 117
 118         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 119         if (new == NULL)
 120                 return NULL;
 121
 122         new->key = agp_get_key();
 123
 124         if (new->key < 0) {
 125                 kfree(new);
 126                 return NULL;
 127         }
 128
 129         agp_alloc_page_array(alloc_size, new);
 130
 131         if (new->pages == NULL) {
 132                 agp_free_key(new->key);
 133                 kfree(new);
 134                 return NULL;
 135         }
 136         new->num_scratch_pages = 0;
 137         return new;
 138 }
 139
 140 struct agp_memory *agp_create_memory(int scratch_pages)
 141 {
 142         struct agp_memory *new;
 143
 144         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 145         if (new == NULL)
 146                 return NULL;
 147
 148         new->key = agp_get_key();
 149
 150         if (new->key < 0) {
 151                 kfree(new);
 152                 return NULL;
 153         }
 154
 155         agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
 156
 157         if (new->pages == NULL) {
 158                 agp_free_key(new->key);
 159                 kfree(new);
 160                 return NULL;
 161         }
 162         new->num_scratch_pages = scratch_pages;
 163         new->type = AGP_NORMAL_MEMORY;
 164         return new;
 165 }
 166 EXPORT_SYMBOL(agp_create_memory);
 167
 168 /**
 169  *      agp_free_memory - free memory associated with an agp_memory pointer.
 170  *
 171  *      @curr:          agp_memory pointer to be freed.
 172  *
 173  *      It is the only function that can be called when the backend is not owned
 174  *      by the caller.  (So it can free memory on client death.)
 175  */
 176 void agp_free_memory(struct agp_memory *curr)
 177 {
 178         size_t i;
 179
 180         if (curr == NULL)
 181                 return;
 182
 183         if (curr->is_bound)
 184                 agp_unbind_memory(curr);
 185
 186         if (curr->type >= AGP_USER_TYPES) {
 187                 agp_generic_free_by_type(curr);
 188                 return;
 189         }
 190
 191         if (curr->type != 0) {
 192                 curr->bridge->driver->free_by_type(curr);
 193                 return;
 194         }
 195         if (curr->page_count != 0) {
 196                 if (curr->bridge->driver->agp_destroy_pages) {
 197                         curr->bridge->driver->agp_destroy_pages(curr);
 198                 } else {
 199
 200                         for (i = 0; i < curr->page_count; i++) {
 201                                 curr->bridge->driver->agp_destroy_page(
 202                                         curr->pages[i],
 203                                         AGP_PAGE_DESTROY_UNMAP);
 204                         }
 205                         for (i = 0; i < curr->page_count; i++) {
 206                                 curr->bridge->driver->agp_destroy_page(
 207                                         curr->pages[i],
 208                                         AGP_PAGE_DESTROY_FREE);
 209                         }
 210                 }
 211         }
 212         agp_free_key(curr->key);
 213         agp_free_page_array(curr);
 214         kfree(curr);
 215 }
 216 EXPORT_SYMBOL(agp_free_memory);
 217
 218 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 219
 220 /**
 221  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 222  *
 223  *      @page_count:    size_t argument of the number of pages
 224  *      @type:  u32 argument of the type of memory to be allocated.
 225  *
 226  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 227  *      maps to physical ram.  Any other type is device dependent.
 228  *
 229  *      It returns NULL whenever memory is unavailable.
 230  */
 231 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 232                                         size_t page_count, u32 type)
 233 {
 234         int scratch_pages;
 235         struct agp_memory *new;
 236         size_t i;
 237
 238         if (!bridge)
 239                 return NULL;
 240
 241         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
 242                 return NULL;
 243
 244         if (type >= AGP_USER_TYPES) {
 245                 new = agp_generic_alloc_user(page_count, type);
 246                 if (new)
 247                         new->bridge = bridge;
 248                 return new;
 249         }
 250
 251         if (type != 0) {
 252                 new = bridge->driver->alloc_by_type(page_count, type);
 253                 if (new)
 254                         new->bridge = bridge;
 255                 return new;
 256         }
 257
 258         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 259
 260         new = agp_create_memory(scratch_pages);
 261
 262         if (new == NULL)
 263                 return NULL;
 264
 265         if (bridge->driver->agp_alloc_pages) {
 266                 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
 267                         agp_free_memory(new);
 268                         return NULL;
 269                 }
 270                 new->bridge = bridge;
 271                 return new;
 272         }
 273
 274         for (i = 0; i < page_count; i++) {
 275                 struct page *page = bridge->driver->agp_alloc_page(bridge);
 276
 277                 if (page == NULL) {
 278                         agp_free_memory(new);
 279                         return NULL;
 280                 }
 281                 new->pages[i] = page;
 282                 new->page_count++;
 283         }
 284         new->bridge = bridge;
 285
 286         return new;
 287 }
 288 EXPORT_SYMBOL(agp_allocate_memory);
 289
 290
 291 /* End - Generic routines for handling agp_memory structures */
 292
 293
 294 static int agp_return_size(void)
 295 {
 296         int current_size;
 297         void *temp;
 298
 299         temp = agp_bridge->current_size;
 300
 301         switch (agp_bridge->driver->size_type) {
 302         case U8_APER_SIZE:
 303                 current_size = A_SIZE_8(temp)->size;
 304                 break;
 305         case U16_APER_SIZE:
 306                 current_size = A_SIZE_16(temp)->size;
 307                 break;
 308         case U32_APER_SIZE:
 309                 current_size = A_SIZE_32(temp)->size;
 310                 break;
 311         case LVL2_APER_SIZE:
 312                 current_size = A_SIZE_LVL2(temp)->size;
 313                 break;
 314         case FIXED_APER_SIZE:
 315                 current_size = A_SIZE_FIX(temp)->size;
 316                 break;
 317         default:
 318                 current_size = 0;
 319                 break;
 320         }
 321
 322         current_size -= (agp_memory_reserved / (1024*1024));
 323         if (current_size <0)
 324                 current_size = 0;
 325         return current_size;
 326 }
 327
 328
 329 int agp_num_entries(void)
 330 {
 331         int num_entries;
 332         void *temp;
 333
 334         temp = agp_bridge->current_size;
 335
 336         switch (agp_bridge->driver->size_type) {
 337         case U8_APER_SIZE:
 338                 num_entries = A_SIZE_8(temp)->num_entries;
 339                 break;
 340         case U16_APER_SIZE:
 341                 num_entries = A_SIZE_16(temp)->num_entries;
 342                 break;
 343         case U32_APER_SIZE:
 344                 num_entries = A_SIZE_32(temp)->num_entries;
 345                 break;
 346         case LVL2_APER_SIZE:
 347                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 348                 break;
 349         case FIXED_APER_SIZE:
 350                 num_entries = A_SIZE_FIX(temp)->num_entries;
 351                 break;
 352         default:
 353                 num_entries = 0;
 354                 break;
 355         }
 356
 357         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 358         if (num_entries<0)
 359                 num_entries = 0;
 360         return num_entries;
 361 }
 362 EXPORT_SYMBOL_GPL(agp_num_entries);
 363
 364
 365 /**
 366  *      agp_copy_info  -  copy bridge state information
 367  *
 368  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 369  *
 370  *      This function copies information about the agp bridge device and the state of
 371  *      the agp backend into an agp_kern_info pointer.
 372  */
 373 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 374 {
 375         memset(info, 0, sizeof(struct agp_kern_info));
 376         if (!bridge) {
 377                 info->chipset = NOT_SUPPORTED;
 378                 return -EIO;
 379         }
 380
 381         info->version.major = bridge->version->major;
 382         info->version.minor = bridge->version->minor;
 383         info->chipset = SUPPORTED;
 384         info->device = bridge->dev;
 385         if (bridge->mode & AGPSTAT_MODE_3_0)
 386                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 387         else
 388                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 389         info->aper_base = bridge->gart_bus_addr;
 390         info->aper_size = agp_return_size();
 391         info->max_memory = bridge->max_memory_agp;
 392         info->current_memory = atomic_read(&bridge->current_memory_agp);
 393         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 394         info->vm_ops = bridge->vm_ops;
 395         info->page_mask = ~0UL;
 396         return 0;
 397 }
 398 EXPORT_SYMBOL(agp_copy_info);
 399
 400 /* End - Routine to copy over information structure */
 401
 402 /*
 403  * Routines for handling swapping of agp_memory into the GATT -
 404  * These routines take agp_memory and insert them into the GATT.
 405  * They call device specific routines to actually write to the GATT.
 406  */
 407
 408 /**
 409  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 410  *
 411  *      @curr:          agp_memory pointer
 412  *      @pg_start:      an offset into the graphics aperture translation table
 413  *
 414  *      It returns -EINVAL if the pointer == NULL.
 415  *      It returns -EBUSY if the area of the table requested is already in use.
 416  */
 417 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 418 {
 419         int ret_val;
 420
 421         if (curr == NULL)
 422                 return -EINVAL;
 423
 424         if (curr->is_bound) {
 425                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
 426                 return -EINVAL;
 427         }
 428         if (!curr->is_flushed) {
 429                 curr->bridge->driver->cache_flush();
 430                 curr->is_flushed = true;
 431         }
 432
 433         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 434
 435         if (ret_val != 0)
 436                 return ret_val;
 437
 438         curr->is_bound = true;
 439         curr->pg_start = pg_start;
 440         spin_lock(&agp_bridge->mapped_lock);
 441         list_add(&curr->mapped_list, &agp_bridge->mapped_list);
 442         spin_unlock(&agp_bridge->mapped_lock);
 443
 444         return 0;
 445 }
 446 EXPORT_SYMBOL(agp_bind_memory);
 447
 448
 449 /**
 450  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 451  *
 452  * @curr:       agp_memory pointer to be removed from the GATT.
 453  *
 454  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 455  * the graphics aperture translation table or if the agp_memory pointer == NULL
 456  */
 457 int agp_unbind_memory(struct agp_memory *curr)
 458 {
 459         int ret_val;
 460
 461         if (curr == NULL)
 462                 return -EINVAL;
 463
 464         if (!curr->is_bound) {
 465                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
 466                 return -EINVAL;
 467         }
 468
 469         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 470
 471         if (ret_val != 0)
 472                 return ret_val;
 473
 474         curr->is_bound = false;
 475         curr->pg_start = 0;
 476         spin_lock(&curr->bridge->mapped_lock);
 477         list_del(&curr->mapped_list);
 478         spin_unlock(&curr->bridge->mapped_lock);
 479         return 0;
 480 }
 481 EXPORT_SYMBOL(agp_unbind_memory);
 482
 483 /**
 484  *      agp_rebind_emmory  -  Rewrite the entire GATT, useful on resume
 485  */
 486 int agp_rebind_memory(void)
 487 {
 488         struct agp_memory *curr;
 489         int ret_val = 0;
 490
 491         spin_lock(&agp_bridge->mapped_lock);
 492         list_for_each_entry(curr, &agp_bridge->mapped_list, mapped_list) {
 493                 ret_val = curr->bridge->driver->insert_memory(curr,
 494                                                               curr->pg_start,
 495                                                               curr->type);
 496                 if (ret_val != 0)
 497                         break;
 498         }
 499         spin_unlock(&agp_bridge->mapped_lock);
 500         return ret_val;
 501 }
 502 EXPORT_SYMBOL(agp_rebind_memory);
 503
 504 /* End - Routines for handling swapping of agp_memory into the GATT */
 505
 506
 507 /* Generic Agp routines - Start */
 508 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 509 {
 510         u32 tmp;
 511
 512         if (*requested_mode & AGP2_RESERVED_MASK) {
 513                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 514                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
 515                 *requested_mode &= ~AGP2_RESERVED_MASK;
 516         }
 517
 518         /*
 519          * Some dumb bridges are programmed to disobey the AGP2 spec.
 520          * This is likely a BIOS misprogramming rather than poweron default, or
 521          * it would be a lot more common.
 522          * https://bugs.freedesktop.org/show_bug.cgi?id=8816
 523          * AGPv2 spec 6.1.9 states:
 524          *   The RATE field indicates the data transfer rates supported by this
 525          *   device. A.G.P. devices must report all that apply.
 526          * Fix them up as best we can.
 527          */
 528         switch (*bridge_agpstat & 7) {
 529         case 4:
 530                 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
 531                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
 532                         "Fixing up support for x2 & x1\n");
 533                 break;
 534         case 2:
 535                 *bridge_agpstat |= AGPSTAT2_1X;
 536                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
 537                         "Fixing up support for x1\n");
 538                 break;
 539         default:
 540                 break;
 541         }
 542
 543         /* Check the speed bits make sense. Only one should be set. */
 544         tmp = *requested_mode & 7;
 545         switch (tmp) {
 546                 case 0:
 547                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 548                         *requested_mode |= AGPSTAT2_1X;
 549                         break;
 550                 case 1:
 551                 case 2:
 552                         break;
 553                 case 3:
 554                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 555                         break;
 556                 case 4:
 557                         break;
 558                 case 5:
 559                 case 6:
 560                 case 7:
 561                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 562                         break;
 563         }
 564
 565         /* disable SBA if it's not supported */
 566         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 567                 *bridge_agpstat &= ~AGPSTAT_SBA;
 568
 569         /* Set rate */
 570         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 571                 *bridge_agpstat &= ~AGPSTAT2_4X;
 572
 573         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 574                 *bridge_agpstat &= ~AGPSTAT2_2X;
 575
 576         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 577                 *bridge_agpstat &= ~AGPSTAT2_1X;
 578
 579         /* Now we know what mode it should be, clear out the unwanted bits. */
 580         if (*bridge_agpstat & AGPSTAT2_4X)
 581                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 582
 583         if (*bridge_agpstat & AGPSTAT2_2X)
 584                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 585
 586         if (*bridge_agpstat & AGPSTAT2_1X)
 587                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 588
 589         /* Apply any errata. */
 590         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 591                 *bridge_agpstat &= ~AGPSTAT_FW;
 592
 593         if (agp_bridge->flags & AGP_ERRATA_SBA)
 594                 *bridge_agpstat &= ~AGPSTAT_SBA;
 595
 596         if (agp_bridge->flags & AGP_ERRATA_1X) {
 597                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 598                 *bridge_agpstat |= AGPSTAT2_1X;
 599         }
 600
 601         /* If we've dropped down to 1X, disable fast writes. */
 602         if (*bridge_agpstat & AGPSTAT2_1X)
 603                 *bridge_agpstat &= ~AGPSTAT_FW;
 604 }
 605
 606 /*
 607  * requested_mode = Mode requested by (typically) X.
 608  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 609  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 610  */
 611 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 612 {
 613         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 614         u32 tmp;
 615
 616         if (*requested_mode & AGP3_RESERVED_MASK) {
 617                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 618                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
 619                 *requested_mode &= ~AGP3_RESERVED_MASK;
 620         }
 621
 622         /* Check the speed bits make sense. */
 623         tmp = *requested_mode & 7;
 624         if (tmp == 0) {
 625                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 626                 *requested_mode |= AGPSTAT3_4X;
 627         }
 628         if (tmp >= 3) {
 629                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 630                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 631         }
 632
 633         /* ARQSZ - Set the value to the maximum one.
 634          * Don't allow the mode register to override values. */
 635         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 636                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 637
 638         /* Calibration cycle.
 639          * Don't allow the mode register to override values. */
 640         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 641                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 642
 643         /* SBA *must* be supported for AGP v3 */
 644         *bridge_agpstat |= AGPSTAT_SBA;
 645
 646         /*
 647          * Set speed.
 648          * Check for invalid speeds. This can happen when applications
 649          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 650          */
 651         if (*requested_mode & AGPSTAT_MODE_3_0) {
 652                 /*
 653                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 654                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 655                  * AGP2.x 4x -> AGP3.0 4x.
 656                  */
 657                 if (*requested_mode & AGPSTAT2_4X) {
 658                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 659                                                 current->comm, *requested_mode);
 660                         *requested_mode &= ~AGPSTAT2_4X;
 661                         *requested_mode |= AGPSTAT3_4X;
 662                 }
 663         } else {
 664                 /*
 665                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 666                  * but have been passed an AGP 2.x mode.
 667                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 668                  */
 669                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 670                                         current->comm, *requested_mode);
 671                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 672                 *requested_mode |= AGPSTAT3_4X;
 673         }
 674
 675         if (*requested_mode & AGPSTAT3_8X) {
 676                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 677                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 678                         *bridge_agpstat |= AGPSTAT3_4X;
 679                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
 680                         return;
 681                 }
 682                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 683                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 684                         *bridge_agpstat |= AGPSTAT3_4X;
 685                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
 686                         return;
 687                 }
 688                 /* All set, bridge & device can do AGP x8*/
 689                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 690                 goto done;
 691
 692         } else if (*requested_mode & AGPSTAT3_4X) {
 693                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 694                 *bridge_agpstat |= AGPSTAT3_4X;
 695                 goto done;
 696
 697         } else {
 698
 699                 /*
 700                  * If we didn't specify an AGP mode, we see if both
 701                  * the graphics card, and the bridge can do x8, and use if so.
 702                  * If not, we fall back to x4 mode.
 703                  */
 704                 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
 705                         printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
 706                                 "supported by bridge & card (x8).\n");
 707                         *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 708                         *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 709                 } else {
 710                         printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
 711                         if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 712                                 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
 713                                         *bridge_agpstat, origbridge);
 714                                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 715                                 *bridge_agpstat |= AGPSTAT3_4X;
 716                         }
 717                         if (!(*vga_agpstat & AGPSTAT3_8X)) {
 718                                 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
 719                                         *vga_agpstat, origvga);
 720                                 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 721                                 *vga_agpstat |= AGPSTAT3_4X;
 722                         }
 723                 }
 724         }
 725
 726 done:
 727         /* Apply any errata. */
 728         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 729                 *bridge_agpstat &= ~AGPSTAT_FW;
 730
 731         if (agp_bridge->flags & AGP_ERRATA_SBA)
 732                 *bridge_agpstat &= ~AGPSTAT_SBA;
 733
 734         if (agp_bridge->flags & AGP_ERRATA_1X) {
 735                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 736                 *bridge_agpstat |= AGPSTAT2_1X;
 737         }
 738 }
 739
 740
 741 /**
 742  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 743  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 744  * @requested_mode: requested agp_stat from userspace (Typically from X)
 745  * @bridge_agpstat: current agp_stat from AGP bridge.
 746  *
 747  * This function will hunt for an AGP graphics card, and try to match
 748  * the requested mode to the capabilities of both the bridge and the card.
 749  */
 750 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 751 {
 752         struct pci_dev *device = NULL;
 753         u32 vga_agpstat;
 754         u8 cap_ptr;
 755
 756         for (;;) {
 757                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 758                 if (!device) {
 759                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 760                         return 0;
 761                 }
 762                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 763                 if (cap_ptr)
 764                         break;
 765         }
 766
 767         /*
 768          * Ok, here we have a AGP device. Disable impossible
 769          * settings, and adjust the readqueue to the minimum.
 770          */
 771         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 772
 773         /* adjust RQ depth */
 774         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 775              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 776                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 777
 778         /* disable FW if it's not supported */
 779         if (!((bridge_agpstat & AGPSTAT_FW) &&
 780                  (vga_agpstat & AGPSTAT_FW) &&
 781                  (requested_mode & AGPSTAT_FW)))
 782                 bridge_agpstat &= ~AGPSTAT_FW;
 783
 784         /* Check to see if we are operating in 3.0 mode */
 785         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 786                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 787         else
 788                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 789
 790         pci_dev_put(device);
 791         return bridge_agpstat;
 792 }
 793 EXPORT_SYMBOL(agp_collect_device_status);
 794
 795
 796 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
 797 {
 798         struct pci_dev *device = NULL;
 799         int mode;
 800
 801         mode = bridge_agpstat & 0x7;
 802         if (agp_v3)
 803                 mode *= 4;
 804
 805         for_each_pci_dev(device) {
 806                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 807                 if (!agp)
 808                         continue;
 809
 810                 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
 811                          agp_v3 ? 3 : 2, mode);
 812                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 813         }
 814 }
 815 EXPORT_SYMBOL(agp_device_command);
 816
 817
 818 void get_agp_version(struct agp_bridge_data *bridge)
 819 {
 820         u32 ncapid;
 821
 822         /* Exit early if already set by errata workarounds. */
 823         if (bridge->major_version != 0)
 824                 return;
 825
 826         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 827         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 828         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 829 }
 830 EXPORT_SYMBOL(get_agp_version);
 831
 832
 833 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 834 {
 835         u32 bridge_agpstat, temp;
 836
 837         get_agp_version(agp_bridge);
 838
 839         dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
 840                  agp_bridge->major_version, agp_bridge->minor_version);
 841
 842         pci_read_config_dword(agp_bridge->dev,
 843                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 844
 845         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 846         if (bridge_agpstat == 0)
 847                 /* Something bad happened. FIXME: Return error code? */
 848                 return;
 849
 850         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 851
 852         /* Do AGP version specific frobbing. */
 853         if (bridge->major_version >= 3) {
 854                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 855                         /* If we have 3.5, we can do the isoch stuff. */
 856                         if (bridge->minor_version >= 5)
 857                                 agp_3_5_enable(bridge);
 858                         agp_device_command(bridge_agpstat, true);
 859                         return;
 860                 } else {
 861                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 862                     bridge_agpstat &= ~(7<<10) ;
 863                     pci_read_config_dword(bridge->dev,
 864                                         bridge->capndx+AGPCTRL, &temp);
 865                     temp |= (1<<9);
 866                     pci_write_config_dword(bridge->dev,
 867                                         bridge->capndx+AGPCTRL, temp);
 868
 869                     dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
 870                 }
 871         }
 872
 873         /* AGP v<3 */
 874         agp_device_command(bridge_agpstat, false);
 875 }
 876 EXPORT_SYMBOL(agp_generic_enable);
 877
 878
 879 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 880 {
 881         char *table;
 882         char *table_end;
 883         int size;
 884         int page_order;
 885         int num_entries;
 886         int i;
 887         void *temp;
 888         struct page *page;
 889
 890         /* The generic routines can't handle 2 level gatt's */
 891         if (bridge->driver->size_type == LVL2_APER_SIZE)
 892                 return -EINVAL;
 893
 894         table = NULL;
 895         i = bridge->aperture_size_idx;
 896         temp = bridge->current_size;
 897         size = page_order = num_entries = 0;
 898
 899         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 900                 do {
 901                         switch (bridge->driver->size_type) {
 902                         case U8_APER_SIZE:
 903                                 size = A_SIZE_8(temp)->size;
 904                                 page_order =
 905                                     A_SIZE_8(temp)->page_order;
 906                                 num_entries =
 907                                     A_SIZE_8(temp)->num_entries;
 908                                 break;
 909                         case U16_APER_SIZE:
 910                                 size = A_SIZE_16(temp)->size;
 911                                 page_order = A_SIZE_16(temp)->page_order;
 912                                 num_entries = A_SIZE_16(temp)->num_entries;
 913                                 break;
 914                         case U32_APER_SIZE:
 915                                 size = A_SIZE_32(temp)->size;
 916                                 page_order = A_SIZE_32(temp)->page_order;
 917                                 num_entries = A_SIZE_32(temp)->num_entries;
 918                                 break;
 919                                 /* This case will never really happen. */
 920                         case FIXED_APER_SIZE:
 921                         case LVL2_APER_SIZE:
 922                         default:
 923                                 size = page_order = num_entries = 0;
 924                                 break;
 925                         }
 926
 927                         table = alloc_gatt_pages(page_order);
 928
 929                         if (table == NULL) {
 930                                 i++;
 931                                 switch (bridge->driver->size_type) {
 932                                 case U8_APER_SIZE:
 933                                         bridge->current_size = A_IDX8(bridge);
 934                                         break;
 935                                 case U16_APER_SIZE:
 936                                         bridge->current_size = A_IDX16(bridge);
 937                                         break;
 938                                 case U32_APER_SIZE:
 939                                         bridge->current_size = A_IDX32(bridge);
 940                                         break;
 941                                 /* These cases will never really happen. */
 942                                 case FIXED_APER_SIZE:
 943                                 case LVL2_APER_SIZE:
 944                                 default:
 945                                         break;
 946                                 }
 947                                 temp = bridge->current_size;
 948                         } else {
 949                                 bridge->aperture_size_idx = i;
 950                         }
 951                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 952         } else {
 953                 size = ((struct aper_size_info_fixed *) temp)->size;
 954                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 955                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 956                 table = alloc_gatt_pages(page_order);
 957         }
 958
 959         if (table == NULL)
 960                 return -ENOMEM;
 961
 962         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 963
 964         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 965                 SetPageReserved(page);
 966
 967         bridge->gatt_table_real = (u32 *) table;
 968         agp_gatt_table = (void *)table;
 969
 970         bridge->driver->cache_flush();
 971 #ifdef CONFIG_X86
 972         if (set_memory_uc((unsigned long)table, 1 << page_order))
 973                 printk(KERN_WARNING "Could not set GATT table memory to UC!");
 974
 975         bridge->gatt_table = (void *)table;
 976 #else
 977         bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
 978                                         (PAGE_SIZE * (1 << page_order)));
 979         bridge->driver->cache_flush();
 980 #endif
 981
 982         if (bridge->gatt_table == NULL) {
 983                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 984                         ClearPageReserved(page);
 985
 986                 free_gatt_pages(table, page_order);
 987
 988                 return -ENOMEM;
 989         }
 990         bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
 991
 992         /* AK: bogus, should encode addresses > 4GB */
 993         for (i = 0; i < num_entries; i++) {
 994                 writel(bridge->scratch_page, bridge->gatt_table+i);
 995                 readl(bridge->gatt_table+i);    /* PCI Posting. */
 996         }
 997
 998         return 0;
 999 }
1000 EXPORT_SYMBOL(agp_generic_create_gatt_table);
1001
1002 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
1003 {
1004         int page_order;
1005         char *table, *table_end;
1006         void *temp;
1007         struct page *page;
1008
1009         temp = bridge->current_size;
1010
1011         switch (bridge->driver->size_type) {
1012         case U8_APER_SIZE:
1013                 page_order = A_SIZE_8(temp)->page_order;
1014                 break;
1015         case U16_APER_SIZE:
1016                 page_order = A_SIZE_16(temp)->page_order;
1017                 break;
1018         case U32_APER_SIZE:
1019                 page_order = A_SIZE_32(temp)->page_order;
1020                 break;
1021         case FIXED_APER_SIZE:
1022                 page_order = A_SIZE_FIX(temp)->page_order;
1023                 break;
1024         case LVL2_APER_SIZE:
1025                 /* The generic routines can't deal with 2 level gatt's */
1026                 return -EINVAL;
1027                 break;
1028         default:
1029                 page_order = 0;
1030                 break;
1031         }
1032
1033         /* Do not worry about freeing memory, because if this is
1034          * called, then all agp memory is deallocated and removed
1035          * from the table. */
1036
1037 #ifdef CONFIG_X86
1038         set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1039 #else
1040         iounmap(bridge->gatt_table);
1041 #endif
1042         table = (char *) bridge->gatt_table_real;
1043         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1044
1045         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1046                 ClearPageReserved(page);
1047
1048         free_gatt_pages(bridge->gatt_table_real, page_order);
1049
1050         agp_gatt_table = NULL;
1051         bridge->gatt_table = NULL;
1052         bridge->gatt_table_real = NULL;
1053         bridge->gatt_bus_addr = 0;
1054
1055         return 0;
1056 }
1057 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1058
1059
1060 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1061 {
1062         int num_entries;
1063         size_t i;
1064         off_t j;
1065         void *temp;
1066         struct agp_bridge_data *bridge;
1067         int mask_type;
1068
1069         bridge = mem->bridge;
1070         if (!bridge)
1071                 return -EINVAL;
1072
1073         if (mem->page_count == 0)
1074                 return 0;
1075
1076         temp = bridge->current_size;
1077
1078         switch (bridge->driver->size_type) {
1079         case U8_APER_SIZE:
1080                 num_entries = A_SIZE_8(temp)->num_entries;
1081                 break;
1082         case U16_APER_SIZE:
1083                 num_entries = A_SIZE_16(temp)->num_entries;
1084                 break;
1085         case U32_APER_SIZE:
1086                 num_entries = A_SIZE_32(temp)->num_entries;
1087                 break;
1088         case FIXED_APER_SIZE:
1089                 num_entries = A_SIZE_FIX(temp)->num_entries;
1090                 break;
1091         case LVL2_APER_SIZE:
1092                 /* The generic routines can't deal with 2 level gatt's */
1093                 return -EINVAL;
1094                 break;
1095         default:
1096                 num_entries = 0;
1097                 break;
1098         }
1099
1100         num_entries -= agp_memory_reserved/PAGE_SIZE;
1101         if (num_entries < 0) num_entries = 0;
1102
1103         if (type != mem->type)
1104                 return -EINVAL;
1105
1106         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1107         if (mask_type != 0) {
1108                 /* The generic routines know nothing of memory types */
1109                 return -EINVAL;
1110         }
1111
1112         /* AK: could wrap */
1113         if ((pg_start + mem->page_count) > num_entries)
1114                 return -EINVAL;
1115
1116         j = pg_start;
1117
1118         while (j < (pg_start + mem->page_count)) {
1119                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1120                         return -EBUSY;
1121                 j++;
1122         }
1123
1124         if (!mem->is_flushed) {
1125                 bridge->driver->cache_flush();
1126                 mem->is_flushed = true;
1127         }
1128
1129         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1130                 writel(bridge->driver->mask_memory(bridge,
1131                                                    page_to_phys(mem->pages[i]),
1132                                                    mask_type),
1133                        bridge->gatt_table+j);
1134         }
1135         readl(bridge->gatt_table+j-1);  /* PCI Posting. */
1136
1137         bridge->driver->tlb_flush(mem);
1138         return 0;
1139 }
1140 EXPORT_SYMBOL(agp_generic_insert_memory);
1141
1142
1143 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1144 {
1145         size_t i;
1146         struct agp_bridge_data *bridge;
1147         int mask_type;
1148
1149         bridge = mem->bridge;
1150         if (!bridge)
1151                 return -EINVAL;
1152
1153         if (mem->page_count == 0)
1154                 return 0;
1155
1156         if (type != mem->type)
1157                 return -EINVAL;
1158
1159         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1160         if (mask_type != 0) {
1161                 /* The generic routines know nothing of memory types */
1162                 return -EINVAL;
1163         }
1164
1165         /* AK: bogus, should encode addresses > 4GB */
1166         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1167                 writel(bridge->scratch_page, bridge->gatt_table+i);
1168         }
1169         readl(bridge->gatt_table+i-1);  /* PCI Posting. */
1170
1171         bridge->driver->tlb_flush(mem);
1172         return 0;
1173 }
1174 EXPORT_SYMBOL(agp_generic_remove_memory);
1175
1176 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1177 {
1178         return NULL;
1179 }
1180 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1181
1182 void agp_generic_free_by_type(struct agp_memory *curr)
1183 {
1184         agp_free_page_array(curr);
1185         agp_free_key(curr->key);
1186         kfree(curr);
1187 }
1188 EXPORT_SYMBOL(agp_generic_free_by_type);
1189
1190 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1191 {
1192         struct agp_memory *new;
1193         int i;
1194         int pages;
1195
1196         pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1197         new = agp_create_user_memory(page_count);
1198         if (new == NULL)
1199                 return NULL;
1200
1201         for (i = 0; i < page_count; i++)
1202                 new->pages[i] = NULL;
1203         new->page_count = 0;
1204         new->type = type;
1205         new->num_scratch_pages = pages;
1206
1207         return new;
1208 }
1209 EXPORT_SYMBOL(agp_generic_alloc_user);
1210
1211 /*
1212  * Basic Page Allocation Routines -
1213  * These routines handle page allocation and by default they reserve the allocated
1214  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1215  * against a maximum value.
1216  */
1217
1218 int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1219 {
1220         struct page * page;
1221         int i, ret = -ENOMEM;
1222
1223         for (i = 0; i < num_pages; i++) {
1224                 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1225                 /* agp_free_memory() needs gart address */
1226                 if (page == NULL)
1227                         goto out;
1228
1229 #ifndef CONFIG_X86
1230                 map_page_into_agp(page);
1231 #endif
1232                 get_page(page);
1233                 atomic_inc(&agp_bridge->current_memory_agp);
1234
1235                 mem->pages[i] = page;
1236                 mem->page_count++;
1237         }
1238
1239 #ifdef CONFIG_X86
1240         set_pages_array_uc(mem->pages, num_pages);
1241 #endif
1242         ret = 0;
1243 out:
1244         return ret;
1245 }
1246 EXPORT_SYMBOL(agp_generic_alloc_pages);
1247
1248 struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1249 {
1250         struct page * page;
1251
1252         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1253         if (page == NULL)
1254                 return NULL;
1255
1256         map_page_into_agp(page);
1257
1258         get_page(page);
1259         atomic_inc(&agp_bridge->current_memory_agp);
1260         return page;
1261 }
1262 EXPORT_SYMBOL(agp_generic_alloc_page);
1263
1264 void agp_generic_destroy_pages(struct agp_memory *mem)
1265 {
1266         int i;
1267         struct page *page;
1268
1269         if (!mem)
1270                 return;
1271
1272 #ifdef CONFIG_X86
1273         set_pages_array_wb(mem->pages, mem->page_count);
1274 #endif
1275
1276         for (i = 0; i < mem->page_count; i++) {
1277                 page = mem->pages[i];
1278
1279 #ifndef CONFIG_X86
1280                 unmap_page_from_agp(page);
1281 #endif
1282                 put_page(page);
1283                 __free_page(page);
1284                 atomic_dec(&agp_bridge->current_memory_agp);
1285                 mem->pages[i] = NULL;
1286         }
1287 }
1288 EXPORT_SYMBOL(agp_generic_destroy_pages);
1289
1290 void agp_generic_destroy_page(struct page *page, int flags)
1291 {
1292         if (page == NULL)
1293                 return;
1294
1295         if (flags & AGP_PAGE_DESTROY_UNMAP)
1296                 unmap_page_from_agp(page);
1297
1298         if (flags & AGP_PAGE_DESTROY_FREE) {
1299                 put_page(page);
1300                 __free_page(page);
1301                 atomic_dec(&agp_bridge->current_memory_agp);
1302         }
1303 }
1304 EXPORT_SYMBOL(agp_generic_destroy_page);
1305
1306 /* End Basic Page Allocation Routines */
1307
1308
1309 /**
1310  * agp_enable  -  initialise the agp point-to-point connection.
1311  *
1312  * @mode:       agp mode register value to configure with.
1313  */
1314 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1315 {
1316         if (!bridge)
1317                 return;
1318         bridge->driver->agp_enable(bridge, mode);
1319 }
1320 EXPORT_SYMBOL(agp_enable);
1321
1322 /* When we remove the global variable agp_bridge from all drivers
1323  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1324  */
1325
1326 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1327 {
1328         if (list_empty(&agp_bridges))
1329                 return NULL;
1330
1331         return agp_bridge;
1332 }
1333
1334 static void ipi_handler(void *null)
1335 {
1336         flush_agp_cache();
1337 }
1338
1339 void global_cache_flush(void)
1340 {
1341         if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1342                 panic(PFX "timed out waiting for the other CPUs!\n");
1343 }
1344 EXPORT_SYMBOL(global_cache_flush);
1345
1346 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1347                                       dma_addr_t addr, int type)
1348 {
1349         /* memory type is ignored in the generic routine */
1350         if (bridge->driver->masks)
1351                 return addr | bridge->driver->masks[0].mask;
1352         else
1353                 return addr;
1354 }
1355 EXPORT_SYMBOL(agp_generic_mask_memory);
1356
1357 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1358                                   int type)
1359 {
1360         if (type >= AGP_USER_TYPES)
1361                 return 0;
1362         return type;
1363 }
1364 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1365
1366 /*
1367  * These functions are implemented according to the AGPv3 spec,
1368  * which covers implementation details that had previously been
1369  * left open.
1370  */
1371
1372 int agp3_generic_fetch_size(void)
1373 {
1374         u16 temp_size;
1375         int i;
1376         struct aper_size_info_16 *values;
1377
1378         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1379         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1380
1381         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1382                 if (temp_size == values[i].size_value) {
1383                         agp_bridge->previous_size =
1384                                 agp_bridge->current_size = (void *) (values + i);
1385
1386                         agp_bridge->aperture_size_idx = i;
1387                         return values[i].size;
1388                 }
1389         }
1390         return 0;
1391 }
1392 EXPORT_SYMBOL(agp3_generic_fetch_size);
1393
1394 void agp3_generic_tlbflush(struct agp_memory *mem)
1395 {
1396         u32 ctrl;
1397         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1398         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1399         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1400 }
1401 EXPORT_SYMBOL(agp3_generic_tlbflush);
1402
1403 int agp3_generic_configure(void)
1404 {
1405         u32 temp;
1406         struct aper_size_info_16 *current_size;
1407
1408         current_size = A_SIZE_16(agp_bridge->current_size);
1409
1410         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1411         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1412
1413         /* set aperture size */
1414         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1415         /* set gart pointer */
1416         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1417         /* enable aperture and GTLB */
1418         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1419         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1420         return 0;
1421 }
1422 EXPORT_SYMBOL(agp3_generic_configure);
1423
1424 void agp3_generic_cleanup(void)
1425 {
1426         u32 ctrl;
1427         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1428         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1429 }
1430 EXPORT_SYMBOL(agp3_generic_cleanup);
1431
1432 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1433 {
1434         {4096, 1048576, 10,0x000},
1435         {2048,  524288, 9, 0x800},
1436         {1024,  262144, 8, 0xc00},
1437         { 512,  131072, 7, 0xe00},
1438         { 256,   65536, 6, 0xf00},
1439         { 128,   32768, 5, 0xf20},
1440         {  64,   16384, 4, 0xf30},
1441         {  32,    8192, 3, 0xf38},
1442         {  16,    4096, 2, 0xf3c},
1443         {   8,    2048, 1, 0xf3e},
1444         {   4,    1024, 0, 0xf3f}
1445 };
1446 EXPORT_SYMBOL(agp3_generic_sizes);
1447