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