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 void agp_flush_chipset(struct agp_bridge_data *bridge)
  85 {
  86         if (bridge->driver->chipset_flush)
  87                 bridge->driver->chipset_flush(bridge);
  88 }
  89 EXPORT_SYMBOL(agp_flush_chipset);
  90
  91 /*
  92  * Use kmalloc if possible for the page list. Otherwise fall back to
  93  * vmalloc. This speeds things up and also saves memory for small AGP
  94  * regions.
  95  */
  96
  97 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
  98 {
  99         mem->pages = NULL;
 100         mem->vmalloc_flag = false;
 101
 102         if (size <= 2*PAGE_SIZE)
 103                 mem->pages = kmalloc(size, GFP_KERNEL | __GFP_NORETRY);
 104         if (mem->pages == NULL) {
 105                 mem->pages = vmalloc(size);
 106                 mem->vmalloc_flag = true;
 107         }
 108 }
 109 EXPORT_SYMBOL(agp_alloc_page_array);
 110
 111 void agp_free_page_array(struct agp_memory *mem)
 112 {
 113         if (mem->vmalloc_flag) {
 114                 vfree(mem->pages);
 115         } else {
 116                 kfree(mem->pages);
 117         }
 118 }
 119 EXPORT_SYMBOL(agp_free_page_array);
 120
 121
 122 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
 123 {
 124         struct agp_memory *new;
 125         unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
 126
 127         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 128         if (new == NULL)
 129                 return NULL;
 130
 131         new->key = agp_get_key();
 132
 133         if (new->key < 0) {
 134                 kfree(new);
 135                 return NULL;
 136         }
 137
 138         agp_alloc_page_array(alloc_size, new);
 139
 140         if (new->pages == NULL) {
 141                 agp_free_key(new->key);
 142                 kfree(new);
 143                 return NULL;
 144         }
 145         new->num_scratch_pages = 0;
 146         return new;
 147 }
 148
 149 struct agp_memory *agp_create_memory(int scratch_pages)
 150 {
 151         struct agp_memory *new;
 152
 153         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 154         if (new == NULL)
 155                 return NULL;
 156
 157         new->key = agp_get_key();
 158
 159         if (new->key < 0) {
 160                 kfree(new);
 161                 return NULL;
 162         }
 163
 164         agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
 165
 166         if (new->pages == NULL) {
 167                 agp_free_key(new->key);
 168                 kfree(new);
 169                 return NULL;
 170         }
 171         new->num_scratch_pages = scratch_pages;
 172         new->type = AGP_NORMAL_MEMORY;
 173         return new;
 174 }
 175 EXPORT_SYMBOL(agp_create_memory);
 176
 177 /**
 178  *      agp_free_memory - free memory associated with an agp_memory pointer.
 179  *
 180  *      @curr:          agp_memory pointer to be freed.
 181  *
 182  *      It is the only function that can be called when the backend is not owned
 183  *      by the caller.  (So it can free memory on client death.)
 184  */
 185 void agp_free_memory(struct agp_memory *curr)
 186 {
 187         size_t i;
 188
 189         if (curr == NULL)
 190                 return;
 191
 192         if (curr->is_bound)
 193                 agp_unbind_memory(curr);
 194
 195         if (curr->type >= AGP_USER_TYPES) {
 196                 agp_generic_free_by_type(curr);
 197                 return;
 198         }
 199
 200         if (curr->type != 0) {
 201                 curr->bridge->driver->free_by_type(curr);
 202                 return;
 203         }
 204         if (curr->page_count != 0) {
 205                 if (curr->bridge->driver->agp_destroy_pages) {
 206                         curr->bridge->driver->agp_destroy_pages(curr);
 207                 } else {
 208
 209                         for (i = 0; i < curr->page_count; i++) {
 210                                 curr->bridge->driver->agp_destroy_page(
 211                                         curr->pages[i],
 212                                         AGP_PAGE_DESTROY_UNMAP);
 213                         }
 214                         for (i = 0; i < curr->page_count; i++) {
 215                                 curr->bridge->driver->agp_destroy_page(
 216                                         curr->pages[i],
 217                                         AGP_PAGE_DESTROY_FREE);
 218                         }
 219                 }
 220         }
 221         agp_free_key(curr->key);
 222         agp_free_page_array(curr);
 223         kfree(curr);
 224 }
 225 EXPORT_SYMBOL(agp_free_memory);
 226
 227 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 228
 229 /**
 230  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 231  *
 232  *      @page_count:    size_t argument of the number of pages
 233  *      @type:  u32 argument of the type of memory to be allocated.
 234  *
 235  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 236  *      maps to physical ram.  Any other type is device dependent.
 237  *
 238  *      It returns NULL whenever memory is unavailable.
 239  */
 240 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 241                                         size_t page_count, u32 type)
 242 {
 243         int scratch_pages;
 244         struct agp_memory *new;
 245         size_t i;
 246
 247         if (!bridge)
 248                 return NULL;
 249
 250         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
 251                 return NULL;
 252
 253         if (type >= AGP_USER_TYPES) {
 254                 new = agp_generic_alloc_user(page_count, type);
 255                 if (new)
 256                         new->bridge = bridge;
 257                 return new;
 258         }
 259
 260         if (type != 0) {
 261                 new = bridge->driver->alloc_by_type(page_count, type);
 262                 if (new)
 263                         new->bridge = bridge;
 264                 return new;
 265         }
 266
 267         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 268
 269         new = agp_create_memory(scratch_pages);
 270
 271         if (new == NULL)
 272                 return NULL;
 273
 274         if (bridge->driver->agp_alloc_pages) {
 275                 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
 276                         agp_free_memory(new);
 277                         return NULL;
 278                 }
 279                 new->bridge = bridge;
 280                 return new;
 281         }
 282
 283         for (i = 0; i < page_count; i++) {
 284                 struct page *page = bridge->driver->agp_alloc_page(bridge);
 285
 286                 if (page == NULL) {
 287                         agp_free_memory(new);
 288                         return NULL;
 289                 }
 290                 new->pages[i] = page;
 291                 new->page_count++;
 292         }
 293         new->bridge = bridge;
 294
 295         return new;
 296 }
 297 EXPORT_SYMBOL(agp_allocate_memory);
 298
 299
 300 /* End - Generic routines for handling agp_memory structures */
 301
 302
 303 static int agp_return_size(void)
 304 {
 305         int current_size;
 306         void *temp;
 307
 308         temp = agp_bridge->current_size;
 309
 310         switch (agp_bridge->driver->size_type) {
 311         case U8_APER_SIZE:
 312                 current_size = A_SIZE_8(temp)->size;
 313                 break;
 314         case U16_APER_SIZE:
 315                 current_size = A_SIZE_16(temp)->size;
 316                 break;
 317         case U32_APER_SIZE:
 318                 current_size = A_SIZE_32(temp)->size;
 319                 break;
 320         case LVL2_APER_SIZE:
 321                 current_size = A_SIZE_LVL2(temp)->size;
 322                 break;
 323         case FIXED_APER_SIZE:
 324                 current_size = A_SIZE_FIX(temp)->size;
 325                 break;
 326         default:
 327                 current_size = 0;
 328                 break;
 329         }
 330
 331         current_size -= (agp_memory_reserved / (1024*1024));
 332         if (current_size <0)
 333                 current_size = 0;
 334         return current_size;
 335 }
 336
 337
 338 int agp_num_entries(void)
 339 {
 340         int num_entries;
 341         void *temp;
 342
 343         temp = agp_bridge->current_size;
 344
 345         switch (agp_bridge->driver->size_type) {
 346         case U8_APER_SIZE:
 347                 num_entries = A_SIZE_8(temp)->num_entries;
 348                 break;
 349         case U16_APER_SIZE:
 350                 num_entries = A_SIZE_16(temp)->num_entries;
 351                 break;
 352         case U32_APER_SIZE:
 353                 num_entries = A_SIZE_32(temp)->num_entries;
 354                 break;
 355         case LVL2_APER_SIZE:
 356                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 357                 break;
 358         case FIXED_APER_SIZE:
 359                 num_entries = A_SIZE_FIX(temp)->num_entries;
 360                 break;
 361         default:
 362                 num_entries = 0;
 363                 break;
 364         }
 365
 366         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 367         if (num_entries<0)
 368                 num_entries = 0;
 369         return num_entries;
 370 }
 371 EXPORT_SYMBOL_GPL(agp_num_entries);
 372
 373
 374 /**
 375  *      agp_copy_info  -  copy bridge state information
 376  *
 377  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 378  *
 379  *      This function copies information about the agp bridge device and the state of
 380  *      the agp backend into an agp_kern_info pointer.
 381  */
 382 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 383 {
 384         memset(info, 0, sizeof(struct agp_kern_info));
 385         if (!bridge) {
 386                 info->chipset = NOT_SUPPORTED;
 387                 return -EIO;
 388         }
 389
 390         info->version.major = bridge->version->major;
 391         info->version.minor = bridge->version->minor;
 392         info->chipset = SUPPORTED;
 393         info->device = bridge->dev;
 394         if (bridge->mode & AGPSTAT_MODE_3_0)
 395                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 396         else
 397                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 398         info->aper_base = bridge->gart_bus_addr;
 399         info->aper_size = agp_return_size();
 400         info->max_memory = bridge->max_memory_agp;
 401         info->current_memory = atomic_read(&bridge->current_memory_agp);
 402         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 403         info->vm_ops = bridge->vm_ops;
 404         info->page_mask = ~0UL;
 405         return 0;
 406 }
 407 EXPORT_SYMBOL(agp_copy_info);
 408
 409 /* End - Routine to copy over information structure */
 410
 411 /*
 412  * Routines for handling swapping of agp_memory into the GATT -
 413  * These routines take agp_memory and insert them into the GATT.
 414  * They call device specific routines to actually write to the GATT.
 415  */
 416
 417 /**
 418  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 419  *
 420  *      @curr:          agp_memory pointer
 421  *      @pg_start:      an offset into the graphics aperture translation table
 422  *
 423  *      It returns -EINVAL if the pointer == NULL.
 424  *      It returns -EBUSY if the area of the table requested is already in use.
 425  */
 426 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 427 {
 428         int ret_val;
 429
 430         if (curr == NULL)
 431                 return -EINVAL;
 432
 433         if (curr->is_bound) {
 434                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
 435                 return -EINVAL;
 436         }
 437         if (!curr->is_flushed) {
 438                 curr->bridge->driver->cache_flush();
 439                 curr->is_flushed = true;
 440         }
 441
 442         if (curr->bridge->driver->agp_map_memory) {
 443                 ret_val = curr->bridge->driver->agp_map_memory(curr);
 444                 if (ret_val)
 445                         return ret_val;
 446         }
 447         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 448
 449         if (ret_val != 0)
 450                 return ret_val;
 451
 452         curr->is_bound = true;
 453         curr->pg_start = pg_start;
 454         spin_lock(&agp_bridge->mapped_lock);
 455         list_add(&curr->mapped_list, &agp_bridge->mapped_list);
 456         spin_unlock(&agp_bridge->mapped_lock);
 457
 458         return 0;
 459 }
 460 EXPORT_SYMBOL(agp_bind_memory);
 461
 462
 463 /**
 464  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 465  *
 466  * @curr:       agp_memory pointer to be removed from the GATT.
 467  *
 468  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 469  * the graphics aperture translation table or if the agp_memory pointer == NULL
 470  */
 471 int agp_unbind_memory(struct agp_memory *curr)
 472 {
 473         int ret_val;
 474
 475         if (curr == NULL)
 476                 return -EINVAL;
 477
 478         if (!curr->is_bound) {
 479                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
 480                 return -EINVAL;
 481         }
 482
 483         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 484
 485         if (ret_val != 0)
 486                 return ret_val;
 487
 488         if (curr->bridge->driver->agp_unmap_memory)
 489                 curr->bridge->driver->agp_unmap_memory(curr);
 490
 491         curr->is_bound = false;
 492         curr->pg_start = 0;
 493         spin_lock(&curr->bridge->mapped_lock);
 494         list_del(&curr->mapped_list);
 495         spin_unlock(&curr->bridge->mapped_lock);
 496         return 0;
 497 }
 498 EXPORT_SYMBOL(agp_unbind_memory);
 499
 500 /**
 501  *      agp_rebind_emmory  -  Rewrite the entire GATT, useful on resume
 502  */
 503 int agp_rebind_memory(void)
 504 {
 505         struct agp_memory *curr;
 506         int ret_val = 0;
 507
 508         spin_lock(&agp_bridge->mapped_lock);
 509         list_for_each_entry(curr, &agp_bridge->mapped_list, mapped_list) {
 510                 ret_val = curr->bridge->driver->insert_memory(curr,
 511                                                               curr->pg_start,
 512                                                               curr->type);
 513                 if (ret_val != 0)
 514                         break;
 515         }
 516         spin_unlock(&agp_bridge->mapped_lock);
 517         return ret_val;
 518 }
 519 EXPORT_SYMBOL(agp_rebind_memory);
 520
 521 /* End - Routines for handling swapping of agp_memory into the GATT */
 522
 523
 524 /* Generic Agp routines - Start */
 525 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 526 {
 527         u32 tmp;
 528
 529         if (*requested_mode & AGP2_RESERVED_MASK) {
 530                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 531                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
 532                 *requested_mode &= ~AGP2_RESERVED_MASK;
 533         }
 534
 535         /*
 536          * Some dumb bridges are programmed to disobey the AGP2 spec.
 537          * This is likely a BIOS misprogramming rather than poweron default, or
 538          * it would be a lot more common.
 539          * https://bugs.freedesktop.org/show_bug.cgi?id=8816
 540          * AGPv2 spec 6.1.9 states:
 541          *   The RATE field indicates the data transfer rates supported by this
 542          *   device. A.G.P. devices must report all that apply.
 543          * Fix them up as best we can.
 544          */
 545         switch (*bridge_agpstat & 7) {
 546         case 4:
 547                 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
 548                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
 549                         "Fixing up support for x2 & x1\n");
 550                 break;
 551         case 2:
 552                 *bridge_agpstat |= AGPSTAT2_1X;
 553                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
 554                         "Fixing up support for x1\n");
 555                 break;
 556         default:
 557                 break;
 558         }
 559
 560         /* Check the speed bits make sense. Only one should be set. */
 561         tmp = *requested_mode & 7;
 562         switch (tmp) {
 563                 case 0:
 564                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 565                         *requested_mode |= AGPSTAT2_1X;
 566                         break;
 567                 case 1:
 568                 case 2:
 569                         break;
 570                 case 3:
 571                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 572                         break;
 573                 case 4:
 574                         break;
 575                 case 5:
 576                 case 6:
 577                 case 7:
 578                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 579                         break;
 580         }
 581
 582         /* disable SBA if it's not supported */
 583         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 584                 *bridge_agpstat &= ~AGPSTAT_SBA;
 585
 586         /* Set rate */
 587         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 588                 *bridge_agpstat &= ~AGPSTAT2_4X;
 589
 590         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 591                 *bridge_agpstat &= ~AGPSTAT2_2X;
 592
 593         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 594                 *bridge_agpstat &= ~AGPSTAT2_1X;
 595
 596         /* Now we know what mode it should be, clear out the unwanted bits. */
 597         if (*bridge_agpstat & AGPSTAT2_4X)
 598                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 599
 600         if (*bridge_agpstat & AGPSTAT2_2X)
 601                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 602
 603         if (*bridge_agpstat & AGPSTAT2_1X)
 604                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 605
 606         /* Apply any errata. */
 607         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 608                 *bridge_agpstat &= ~AGPSTAT_FW;
 609
 610         if (agp_bridge->flags & AGP_ERRATA_SBA)
 611                 *bridge_agpstat &= ~AGPSTAT_SBA;
 612
 613         if (agp_bridge->flags & AGP_ERRATA_1X) {
 614                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 615                 *bridge_agpstat |= AGPSTAT2_1X;
 616         }
 617
 618         /* If we've dropped down to 1X, disable fast writes. */
 619         if (*bridge_agpstat & AGPSTAT2_1X)
 620                 *bridge_agpstat &= ~AGPSTAT_FW;
 621 }
 622
 623 /*
 624  * requested_mode = Mode requested by (typically) X.
 625  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 626  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 627  */
 628 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 629 {
 630         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 631         u32 tmp;
 632
 633         if (*requested_mode & AGP3_RESERVED_MASK) {
 634                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 635                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
 636                 *requested_mode &= ~AGP3_RESERVED_MASK;
 637         }
 638
 639         /* Check the speed bits make sense. */
 640         tmp = *requested_mode & 7;
 641         if (tmp == 0) {
 642                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 643                 *requested_mode |= AGPSTAT3_4X;
 644         }
 645         if (tmp >= 3) {
 646                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 647                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 648         }
 649
 650         /* ARQSZ - Set the value to the maximum one.
 651          * Don't allow the mode register to override values. */
 652         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 653                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 654
 655         /* Calibration cycle.
 656          * Don't allow the mode register to override values. */
 657         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 658                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 659
 660         /* SBA *must* be supported for AGP v3 */
 661         *bridge_agpstat |= AGPSTAT_SBA;
 662
 663         /*
 664          * Set speed.
 665          * Check for invalid speeds. This can happen when applications
 666          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 667          */
 668         if (*requested_mode & AGPSTAT_MODE_3_0) {
 669                 /*
 670                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 671                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 672                  * AGP2.x 4x -> AGP3.0 4x.
 673                  */
 674                 if (*requested_mode & AGPSTAT2_4X) {
 675                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 676                                                 current->comm, *requested_mode);
 677                         *requested_mode &= ~AGPSTAT2_4X;
 678                         *requested_mode |= AGPSTAT3_4X;
 679                 }
 680         } else {
 681                 /*
 682                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 683                  * but have been passed an AGP 2.x mode.
 684                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 685                  */
 686                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 687                                         current->comm, *requested_mode);
 688                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 689                 *requested_mode |= AGPSTAT3_4X;
 690         }
 691
 692         if (*requested_mode & AGPSTAT3_8X) {
 693                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 694                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 695                         *bridge_agpstat |= AGPSTAT3_4X;
 696                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
 697                         return;
 698                 }
 699                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 700                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 701                         *bridge_agpstat |= AGPSTAT3_4X;
 702                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
 703                         return;
 704                 }
 705                 /* All set, bridge & device can do AGP x8*/
 706                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 707                 goto done;
 708
 709         } else if (*requested_mode & AGPSTAT3_4X) {
 710                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 711                 *bridge_agpstat |= AGPSTAT3_4X;
 712                 goto done;
 713
 714         } else {
 715
 716                 /*
 717                  * If we didn't specify an AGP mode, we see if both
 718                  * the graphics card, and the bridge can do x8, and use if so.
 719                  * If not, we fall back to x4 mode.
 720                  */
 721                 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
 722                         printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
 723                                 "supported by bridge & card (x8).\n");
 724                         *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 725                         *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 726                 } else {
 727                         printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
 728                         if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 729                                 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
 730                                         *bridge_agpstat, origbridge);
 731                                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 732                                 *bridge_agpstat |= AGPSTAT3_4X;
 733                         }
 734                         if (!(*vga_agpstat & AGPSTAT3_8X)) {
 735                                 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
 736                                         *vga_agpstat, origvga);
 737                                 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 738                                 *vga_agpstat |= AGPSTAT3_4X;
 739                         }
 740                 }
 741         }
 742
 743 done:
 744         /* Apply any errata. */
 745         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 746                 *bridge_agpstat &= ~AGPSTAT_FW;
 747
 748         if (agp_bridge->flags & AGP_ERRATA_SBA)
 749                 *bridge_agpstat &= ~AGPSTAT_SBA;
 750
 751         if (agp_bridge->flags & AGP_ERRATA_1X) {
 752                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 753                 *bridge_agpstat |= AGPSTAT2_1X;
 754         }
 755 }
 756
 757
 758 /**
 759  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 760  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 761  * @requested_mode: requested agp_stat from userspace (Typically from X)
 762  * @bridge_agpstat: current agp_stat from AGP bridge.
 763  *
 764  * This function will hunt for an AGP graphics card, and try to match
 765  * the requested mode to the capabilities of both the bridge and the card.
 766  */
 767 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 768 {
 769         struct pci_dev *device = NULL;
 770         u32 vga_agpstat;
 771         u8 cap_ptr;
 772
 773         for (;;) {
 774                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 775                 if (!device) {
 776                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 777                         return 0;
 778                 }
 779                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 780                 if (cap_ptr)
 781                         break;
 782         }
 783
 784         /*
 785          * Ok, here we have a AGP device. Disable impossible
 786          * settings, and adjust the readqueue to the minimum.
 787          */
 788         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 789
 790         /* adjust RQ depth */
 791         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 792              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 793                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 794
 795         /* disable FW if it's not supported */
 796         if (!((bridge_agpstat & AGPSTAT_FW) &&
 797                  (vga_agpstat & AGPSTAT_FW) &&
 798                  (requested_mode & AGPSTAT_FW)))
 799                 bridge_agpstat &= ~AGPSTAT_FW;
 800
 801         /* Check to see if we are operating in 3.0 mode */
 802         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 803                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 804         else
 805                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 806
 807         pci_dev_put(device);
 808         return bridge_agpstat;
 809 }
 810 EXPORT_SYMBOL(agp_collect_device_status);
 811
 812
 813 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
 814 {
 815         struct pci_dev *device = NULL;
 816         int mode;
 817
 818         mode = bridge_agpstat & 0x7;
 819         if (agp_v3)
 820                 mode *= 4;
 821
 822         for_each_pci_dev(device) {
 823                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 824                 if (!agp)
 825                         continue;
 826
 827                 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
 828                          agp_v3 ? 3 : 2, mode);
 829                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 830         }
 831 }
 832 EXPORT_SYMBOL(agp_device_command);
 833
 834
 835 void get_agp_version(struct agp_bridge_data *bridge)
 836 {
 837         u32 ncapid;
 838
 839         /* Exit early if already set by errata workarounds. */
 840         if (bridge->major_version != 0)
 841                 return;
 842
 843         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 844         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 845         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 846 }
 847 EXPORT_SYMBOL(get_agp_version);
 848
 849
 850 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 851 {
 852         u32 bridge_agpstat, temp;
 853
 854         get_agp_version(agp_bridge);
 855
 856         dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
 857                  agp_bridge->major_version, agp_bridge->minor_version);
 858
 859         pci_read_config_dword(agp_bridge->dev,
 860                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 861
 862         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 863         if (bridge_agpstat == 0)
 864                 /* Something bad happened. FIXME: Return error code? */
 865                 return;
 866
 867         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 868
 869         /* Do AGP version specific frobbing. */
 870         if (bridge->major_version >= 3) {
 871                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 872                         /* If we have 3.5, we can do the isoch stuff. */
 873                         if (bridge->minor_version >= 5)
 874                                 agp_3_5_enable(bridge);
 875                         agp_device_command(bridge_agpstat, true);
 876                         return;
 877                 } else {
 878                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 879                     bridge_agpstat &= ~(7<<10) ;
 880                     pci_read_config_dword(bridge->dev,
 881                                         bridge->capndx+AGPCTRL, &temp);
 882                     temp |= (1<<9);
 883                     pci_write_config_dword(bridge->dev,
 884                                         bridge->capndx+AGPCTRL, temp);
 885
 886                     dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
 887                 }
 888         }
 889
 890         /* AGP v<3 */
 891         agp_device_command(bridge_agpstat, false);
 892 }
 893 EXPORT_SYMBOL(agp_generic_enable);
 894
 895
 896 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 897 {
 898         char *table;
 899         char *table_end;
 900         int size;
 901         int page_order;
 902         int num_entries;
 903         int i;
 904         void *temp;
 905         struct page *page;
 906
 907         /* The generic routines can't handle 2 level gatt's */
 908         if (bridge->driver->size_type == LVL2_APER_SIZE)
 909                 return -EINVAL;
 910
 911         table = NULL;
 912         i = bridge->aperture_size_idx;
 913         temp = bridge->current_size;
 914         size = page_order = num_entries = 0;
 915
 916         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 917                 do {
 918                         switch (bridge->driver->size_type) {
 919                         case U8_APER_SIZE:
 920                                 size = A_SIZE_8(temp)->size;
 921                                 page_order =
 922                                     A_SIZE_8(temp)->page_order;
 923                                 num_entries =
 924                                     A_SIZE_8(temp)->num_entries;
 925                                 break;
 926                         case U16_APER_SIZE:
 927                                 size = A_SIZE_16(temp)->size;
 928                                 page_order = A_SIZE_16(temp)->page_order;
 929                                 num_entries = A_SIZE_16(temp)->num_entries;
 930                                 break;
 931                         case U32_APER_SIZE:
 932                                 size = A_SIZE_32(temp)->size;
 933                                 page_order = A_SIZE_32(temp)->page_order;
 934                                 num_entries = A_SIZE_32(temp)->num_entries;
 935                                 break;
 936                                 /* This case will never really happen. */
 937                         case FIXED_APER_SIZE:
 938                         case LVL2_APER_SIZE:
 939                         default:
 940                                 size = page_order = num_entries = 0;
 941                                 break;
 942                         }
 943
 944                         table = alloc_gatt_pages(page_order);
 945
 946                         if (table == NULL) {
 947                                 i++;
 948                                 switch (bridge->driver->size_type) {
 949                                 case U8_APER_SIZE:
 950                                         bridge->current_size = A_IDX8(bridge);
 951                                         break;
 952                                 case U16_APER_SIZE:
 953                                         bridge->current_size = A_IDX16(bridge);
 954                                         break;
 955                                 case U32_APER_SIZE:
 956                                         bridge->current_size = A_IDX32(bridge);
 957                                         break;
 958                                 /* These cases will never really happen. */
 959                                 case FIXED_APER_SIZE:
 960                                 case LVL2_APER_SIZE:
 961                                 default:
 962                                         break;
 963                                 }
 964                                 temp = bridge->current_size;
 965                         } else {
 966                                 bridge->aperture_size_idx = i;
 967                         }
 968                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 969         } else {
 970                 size = ((struct aper_size_info_fixed *) temp)->size;
 971                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 972                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 973                 table = alloc_gatt_pages(page_order);
 974         }
 975
 976         if (table == NULL)
 977                 return -ENOMEM;
 978
 979         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 980
 981         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 982                 SetPageReserved(page);
 983
 984         bridge->gatt_table_real = (u32 *) table;
 985         agp_gatt_table = (void *)table;
 986
 987         bridge->driver->cache_flush();
 988 #ifdef CONFIG_X86
 989         set_memory_uc((unsigned long)table, 1 << page_order);
 990         bridge->gatt_table = (void *)table;
 991 #else
 992         bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
 993                                         (PAGE_SIZE * (1 << page_order)));
 994         bridge->driver->cache_flush();
 995 #endif
 996
 997         if (bridge->gatt_table == NULL) {
 998                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 999                         ClearPageReserved(page);
1000
1001                 free_gatt_pages(table, page_order);
1002
1003                 return -ENOMEM;
1004         }
1005         bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
1006
1007         /* AK: bogus, should encode addresses > 4GB */
1008         for (i = 0; i < num_entries; i++) {
1009                 writel(bridge->scratch_page, bridge->gatt_table+i);
1010                 readl(bridge->gatt_table+i);    /* PCI Posting. */
1011         }
1012
1013         return 0;
1014 }
1015 EXPORT_SYMBOL(agp_generic_create_gatt_table);
1016
1017 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
1018 {
1019         int page_order;
1020         char *table, *table_end;
1021         void *temp;
1022         struct page *page;
1023
1024         temp = bridge->current_size;
1025
1026         switch (bridge->driver->size_type) {
1027         case U8_APER_SIZE:
1028                 page_order = A_SIZE_8(temp)->page_order;
1029                 break;
1030         case U16_APER_SIZE:
1031                 page_order = A_SIZE_16(temp)->page_order;
1032                 break;
1033         case U32_APER_SIZE:
1034                 page_order = A_SIZE_32(temp)->page_order;
1035                 break;
1036         case FIXED_APER_SIZE:
1037                 page_order = A_SIZE_FIX(temp)->page_order;
1038                 break;
1039         case LVL2_APER_SIZE:
1040                 /* The generic routines can't deal with 2 level gatt's */
1041                 return -EINVAL;
1042                 break;
1043         default:
1044                 page_order = 0;
1045                 break;
1046         }
1047
1048         /* Do not worry about freeing memory, because if this is
1049          * called, then all agp memory is deallocated and removed
1050          * from the table. */
1051
1052 #ifdef CONFIG_X86
1053         set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1054 #else
1055         iounmap(bridge->gatt_table);
1056 #endif
1057         table = (char *) bridge->gatt_table_real;
1058         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1059
1060         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1061                 ClearPageReserved(page);
1062
1063         free_gatt_pages(bridge->gatt_table_real, page_order);
1064
1065         agp_gatt_table = NULL;
1066         bridge->gatt_table = NULL;
1067         bridge->gatt_table_real = NULL;
1068         bridge->gatt_bus_addr = 0;
1069
1070         return 0;
1071 }
1072 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1073
1074
1075 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1076 {
1077         int num_entries;
1078         size_t i;
1079         off_t j;
1080         void *temp;
1081         struct agp_bridge_data *bridge;
1082         int mask_type;
1083
1084         bridge = mem->bridge;
1085         if (!bridge)
1086                 return -EINVAL;
1087
1088         if (mem->page_count == 0)
1089                 return 0;
1090
1091         temp = bridge->current_size;
1092
1093         switch (bridge->driver->size_type) {
1094         case U8_APER_SIZE:
1095                 num_entries = A_SIZE_8(temp)->num_entries;
1096                 break;
1097         case U16_APER_SIZE:
1098                 num_entries = A_SIZE_16(temp)->num_entries;
1099                 break;
1100         case U32_APER_SIZE:
1101                 num_entries = A_SIZE_32(temp)->num_entries;
1102                 break;
1103         case FIXED_APER_SIZE:
1104                 num_entries = A_SIZE_FIX(temp)->num_entries;
1105                 break;
1106         case LVL2_APER_SIZE:
1107                 /* The generic routines can't deal with 2 level gatt's */
1108                 return -EINVAL;
1109                 break;
1110         default:
1111                 num_entries = 0;
1112                 break;
1113         }
1114
1115         num_entries -= agp_memory_reserved/PAGE_SIZE;
1116         if (num_entries < 0) num_entries = 0;
1117
1118         if (type != mem->type)
1119                 return -EINVAL;
1120
1121         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1122         if (mask_type != 0) {
1123                 /* The generic routines know nothing of memory types */
1124                 return -EINVAL;
1125         }
1126
1127         /* AK: could wrap */
1128         if ((pg_start + mem->page_count) > num_entries)
1129                 return -EINVAL;
1130
1131         j = pg_start;
1132
1133         while (j < (pg_start + mem->page_count)) {
1134                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1135                         return -EBUSY;
1136                 j++;
1137         }
1138
1139         if (!mem->is_flushed) {
1140                 bridge->driver->cache_flush();
1141                 mem->is_flushed = true;
1142         }
1143
1144         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1145                 writel(bridge->driver->mask_memory(bridge,
1146                                                    page_to_phys(mem->pages[i]),
1147                                                    mask_type),
1148                        bridge->gatt_table+j);
1149         }
1150         readl(bridge->gatt_table+j-1);  /* PCI Posting. */
1151
1152         bridge->driver->tlb_flush(mem);
1153         return 0;
1154 }
1155 EXPORT_SYMBOL(agp_generic_insert_memory);
1156
1157
1158 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1159 {
1160         size_t i;
1161         struct agp_bridge_data *bridge;
1162         int mask_type;
1163
1164         bridge = mem->bridge;
1165         if (!bridge)
1166                 return -EINVAL;
1167
1168         if (mem->page_count == 0)
1169                 return 0;
1170
1171         if (type != mem->type)
1172                 return -EINVAL;
1173
1174         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1175         if (mask_type != 0) {
1176                 /* The generic routines know nothing of memory types */
1177                 return -EINVAL;
1178         }
1179
1180         /* AK: bogus, should encode addresses > 4GB */
1181         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1182                 writel(bridge->scratch_page, bridge->gatt_table+i);
1183         }
1184         readl(bridge->gatt_table+i-1);  /* PCI Posting. */
1185
1186         bridge->driver->tlb_flush(mem);
1187         return 0;
1188 }
1189 EXPORT_SYMBOL(agp_generic_remove_memory);
1190
1191 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1192 {
1193         return NULL;
1194 }
1195 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1196
1197 void agp_generic_free_by_type(struct agp_memory *curr)
1198 {
1199         agp_free_page_array(curr);
1200         agp_free_key(curr->key);
1201         kfree(curr);
1202 }
1203 EXPORT_SYMBOL(agp_generic_free_by_type);
1204
1205 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1206 {
1207         struct agp_memory *new;
1208         int i;
1209         int pages;
1210
1211         pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1212         new = agp_create_user_memory(page_count);
1213         if (new == NULL)
1214                 return NULL;
1215
1216         for (i = 0; i < page_count; i++)
1217                 new->pages[i] = 0;
1218         new->page_count = 0;
1219         new->type = type;
1220         new->num_scratch_pages = pages;
1221
1222         return new;
1223 }
1224 EXPORT_SYMBOL(agp_generic_alloc_user);
1225
1226 /*
1227  * Basic Page Allocation Routines -
1228  * These routines handle page allocation and by default they reserve the allocated
1229  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1230  * against a maximum value.
1231  */
1232
1233 int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1234 {
1235         struct page * page;
1236         int i, ret = -ENOMEM;
1237
1238         for (i = 0; i < num_pages; i++) {
1239                 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1240                 /* agp_free_memory() needs gart address */
1241                 if (page == NULL)
1242                         goto out;
1243
1244 #ifndef CONFIG_X86
1245                 map_page_into_agp(page);
1246 #endif
1247                 get_page(page);
1248                 atomic_inc(&agp_bridge->current_memory_agp);
1249
1250                 mem->pages[i] = page;
1251                 mem->page_count++;
1252         }
1253
1254 #ifdef CONFIG_X86
1255         set_pages_array_uc(mem->pages, num_pages);
1256 #endif
1257         ret = 0;
1258 out:
1259         return ret;
1260 }
1261 EXPORT_SYMBOL(agp_generic_alloc_pages);
1262
1263 struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1264 {
1265         struct page * page;
1266
1267         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1268         if (page == NULL)
1269                 return NULL;
1270
1271         map_page_into_agp(page);
1272
1273         get_page(page);
1274         atomic_inc(&agp_bridge->current_memory_agp);
1275         return page;
1276 }
1277 EXPORT_SYMBOL(agp_generic_alloc_page);
1278
1279 void agp_generic_destroy_pages(struct agp_memory *mem)
1280 {
1281         int i;
1282         struct page *page;
1283
1284         if (!mem)
1285                 return;
1286
1287 #ifdef CONFIG_X86
1288         set_pages_array_wb(mem->pages, mem->page_count);
1289 #endif
1290
1291         for (i = 0; i < mem->page_count; i++) {
1292                 page = mem->pages[i];
1293
1294 #ifndef CONFIG_X86
1295                 unmap_page_from_agp(page);
1296 #endif
1297                 put_page(page);
1298                 __free_page(page);
1299                 atomic_dec(&agp_bridge->current_memory_agp);
1300                 mem->pages[i] = NULL;
1301         }
1302 }
1303 EXPORT_SYMBOL(agp_generic_destroy_pages);
1304
1305 void agp_generic_destroy_page(struct page *page, int flags)
1306 {
1307         if (page == NULL)
1308                 return;
1309
1310         if (flags & AGP_PAGE_DESTROY_UNMAP)
1311                 unmap_page_from_agp(page);
1312
1313         if (flags & AGP_PAGE_DESTROY_FREE) {
1314                 put_page(page);
1315                 __free_page(page);
1316                 atomic_dec(&agp_bridge->current_memory_agp);
1317         }
1318 }
1319 EXPORT_SYMBOL(agp_generic_destroy_page);
1320
1321 /* End Basic Page Allocation Routines */
1322
1323
1324 /**
1325  * agp_enable  -  initialise the agp point-to-point connection.
1326  *
1327  * @mode:       agp mode register value to configure with.
1328  */
1329 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1330 {
1331         if (!bridge)
1332                 return;
1333         bridge->driver->agp_enable(bridge, mode);
1334 }
1335 EXPORT_SYMBOL(agp_enable);
1336
1337 /* When we remove the global variable agp_bridge from all drivers
1338  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1339  */
1340
1341 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1342 {
1343         if (list_empty(&agp_bridges))
1344                 return NULL;
1345
1346         return agp_bridge;
1347 }
1348
1349 static void ipi_handler(void *null)
1350 {
1351         flush_agp_cache();
1352 }
1353
1354 void global_cache_flush(void)
1355 {
1356         if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1357                 panic(PFX "timed out waiting for the other CPUs!\n");
1358 }
1359 EXPORT_SYMBOL(global_cache_flush);
1360
1361 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1362                                       dma_addr_t addr, int type)
1363 {
1364         /* memory type is ignored in the generic routine */
1365         if (bridge->driver->masks)
1366                 return addr | bridge->driver->masks[0].mask;
1367         else
1368                 return addr;
1369 }
1370 EXPORT_SYMBOL(agp_generic_mask_memory);
1371
1372 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1373                                   int type)
1374 {
1375         if (type >= AGP_USER_TYPES)
1376                 return 0;
1377         return type;
1378 }
1379 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1380
1381 /*
1382  * These functions are implemented according to the AGPv3 spec,
1383  * which covers implementation details that had previously been
1384  * left open.
1385  */
1386
1387 int agp3_generic_fetch_size(void)
1388 {
1389         u16 temp_size;
1390         int i;
1391         struct aper_size_info_16 *values;
1392
1393         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1394         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1395
1396         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1397                 if (temp_size == values[i].size_value) {
1398                         agp_bridge->previous_size =
1399                                 agp_bridge->current_size = (void *) (values + i);
1400
1401                         agp_bridge->aperture_size_idx = i;
1402                         return values[i].size;
1403                 }
1404         }
1405         return 0;
1406 }
1407 EXPORT_SYMBOL(agp3_generic_fetch_size);
1408
1409 void agp3_generic_tlbflush(struct agp_memory *mem)
1410 {
1411         u32 ctrl;
1412         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1413         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1414         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1415 }
1416 EXPORT_SYMBOL(agp3_generic_tlbflush);
1417
1418 int agp3_generic_configure(void)
1419 {
1420         u32 temp;
1421         struct aper_size_info_16 *current_size;
1422
1423         current_size = A_SIZE_16(agp_bridge->current_size);
1424
1425         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1426         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1427
1428         /* set aperture size */
1429         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1430         /* set gart pointer */
1431         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1432         /* enable aperture and GTLB */
1433         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1434         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1435         return 0;
1436 }
1437 EXPORT_SYMBOL(agp3_generic_configure);
1438
1439 void agp3_generic_cleanup(void)
1440 {
1441         u32 ctrl;
1442         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1443         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1444 }
1445 EXPORT_SYMBOL(agp3_generic_cleanup);
1446
1447 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1448 {
1449         {4096, 1048576, 10,0x000},
1450         {2048,  524288, 9, 0x800},
1451         {1024,  262144, 8, 0xc00},
1452         { 512,  131072, 7, 0xe00},
1453         { 256,   65536, 6, 0xf00},
1454         { 128,   32768, 5, 0xf20},
1455         {  64,   16384, 4, 0xf30},
1456         {  32,    8192, 3, 0xf38},
1457         {  16,    4096, 2, 0xf3c},
1458         {   8,    2048, 1, 0xf3e},
1459         {   4,    1024, 0, 0xf3f}
1460 };
1461 EXPORT_SYMBOL(agp3_generic_sizes);
1462