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