drivers/char/agp/generic.c

   1 /*
   2  * AGPGART driver.
   3  * Copyright (C) 2004 Silicon Graphics, Inc.
   4  * Copyright (C) 2002-2005 Dave Jones.
   5  * Copyright (C) 1999 Jeff Hartmann.
   6  * Copyright (C) 1999 Precision Insight, Inc.
   7  * Copyright (C) 1999 Xi Graphics, Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
  25  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * TODO:
  28  * - Allocate more than order 0 pages to avoid too much linear map splitting.
  29  */
  30 #include <linux/module.h>
  31 #include <linux/pci.h>
  32 #include <linux/init.h>
  33 #include <linux/pagemap.h>
  34 #include <linux/miscdevice.h>
  35 #include <linux/pm.h>
  36 #include <linux/agp_backend.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/dma-mapping.h>
  39 #include <linux/mm.h>
  40 #include <linux/sched.h>
  41 #include <linux/slab.h>
  42 #include <asm/io.h>
  43 #include <asm/cacheflush.h>
  44 #include <asm/pgtable.h>
  45 #include "agp.h"
  46
  47 __u32 *agp_gatt_table;
  48 int agp_memory_reserved;
  49
  50 /*
  51  * Needed by the Nforce GART driver for the time being. Would be
  52  * nice to do this some other way instead of needing this export.
  53  */
  54 EXPORT_SYMBOL_GPL(agp_memory_reserved);
  55
  56 /*
  57  * Generic routines for handling agp_memory structures -
  58  * They use the basic page allocation routines to do the brunt of the work.
  59  */
  60
  61 void agp_free_key(int key)
  62 {
  63         if (key < 0)
  64                 return;
  65
  66         if (key < MAXKEY)
  67                 clear_bit(key, agp_bridge->key_list);
  68 }
  69 EXPORT_SYMBOL(agp_free_key);
  70
  71
  72 static int agp_get_key(void)
  73 {
  74         int bit;
  75
  76         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  77         if (bit < MAXKEY) {
  78                 set_bit(bit, agp_bridge->key_list);
  79                 return bit;
  80         }
  81         return -1;
  82 }
  83
  84 /*
  85  * Use kmalloc if possible for the page list. Otherwise fall back to
  86  * vmalloc. This speeds things up and also saves memory for small AGP
  87  * regions.
  88  */
  89
  90 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
  91 {
  92         mem->pages = NULL;
  93
  94         if (size <= 2*PAGE_SIZE)
  95                 mem->pages = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
  96         if (mem->pages == NULL) {
  97                 mem->pages = vmalloc(size);
  98         }
  99 }
 100 EXPORT_SYMBOL(agp_alloc_page_array);
 101
 102 void agp_free_page_array(struct agp_memory *mem)
 103 {
 104         if (is_vmalloc_addr(mem->pages)) {
 105                 vfree(mem->pages);
 106         } else {
 107                 kfree(mem->pages);
 108         }
 109 }
 110 EXPORT_SYMBOL(agp_free_page_array);
 111
 112
 113 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
 114 {
 115         struct agp_memory *new;
 116         unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
 117
 118         if (INT_MAX/sizeof(struct page *) < num_agp_pages)
 119                 return NULL;
 120
 121         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 122         if (new == NULL)
 123                 return NULL;
 124
 125         new->key = agp_get_key();
 126
 127         if (new->key < 0) {
 128                 kfree(new);
 129                 return NULL;
 130         }
 131
 132         agp_alloc_page_array(alloc_size, new);
 133
 134         if (new->pages == NULL) {
 135                 agp_free_key(new->key);
 136                 kfree(new);
 137                 return NULL;
 138         }
 139         new->num_scratch_pages = 0;
 140         return new;
 141 }
 142
 143 struct agp_memory *agp_create_memory(int scratch_pages)
 144 {
 145         struct agp_memory *new;
 146
 147         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 148         if (new == NULL)
 149                 return NULL;
 150
 151         new->key = agp_get_key();
 152
 153         if (new->key < 0) {
 154                 kfree(new);
 155                 return NULL;
 156         }
 157
 158         agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
 159
 160         if (new->pages == NULL) {
 161                 agp_free_key(new->key);
 162                 kfree(new);
 163                 return NULL;
 164         }
 165         new->num_scratch_pages = scratch_pages;
 166         new->type = AGP_NORMAL_MEMORY;
 167         return new;
 168 }
 169 EXPORT_SYMBOL(agp_create_memory);
 170
 171 /**
 172  *      agp_free_memory - free memory associated with an agp_memory pointer.
 173  *
 174  *      @curr:          agp_memory pointer to be freed.
 175  *
 176  *      It is the only function that can be called when the backend is not owned
 177  *      by the caller.  (So it can free memory on client death.)
 178  */
 179 void agp_free_memory(struct agp_memory *curr)
 180 {
 181         size_t i;
 182
 183         if (curr == NULL)
 184                 return;
 185
 186         if (curr->is_bound)
 187                 agp_unbind_memory(curr);
 188
 189         if (curr->type >= AGP_USER_TYPES) {
 190                 agp_generic_free_by_type(curr);
 191                 return;
 192         }
 193
 194         if (curr->type != 0) {
 195                 curr->bridge->driver->free_by_type(curr);
 196                 return;
 197         }
 198         if (curr->page_count != 0) {
 199                 if (curr->bridge->driver->agp_destroy_pages) {
 200                         curr->bridge->driver->agp_destroy_pages(curr);
 201                 } else {
 202
 203                         for (i = 0; i < curr->page_count; i++) {
 204                                 curr->bridge->driver->agp_destroy_page(
 205                                         curr->pages[i],
 206                                         AGP_PAGE_DESTROY_UNMAP);
 207                         }
 208                         for (i = 0; i < curr->page_count; i++) {
 209                                 curr->bridge->driver->agp_destroy_page(
 210                                         curr->pages[i],
 211                                         AGP_PAGE_DESTROY_FREE);
 212                         }
 213                 }
 214         }
 215         agp_free_key(curr->key);
 216         agp_free_page_array(curr);
 217         kfree(curr);
 218 }
 219 EXPORT_SYMBOL(agp_free_memory);
 220
 221 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 222
 223 /**
 224  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 225  *
 226  *      @page_count:    size_t argument of the number of pages
 227  *      @type:  u32 argument of the type of memory to be allocated.
 228  *
 229  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 230  *      maps to physical ram.  Any other type is device dependent.
 231  *
 232  *      It returns NULL whenever memory is unavailable.
 233  */
 234 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 235                                         size_t page_count, u32 type)
 236 {
 237         int scratch_pages;
 238         struct agp_memory *new;
 239         size_t i;
 240         int cur_memory;
 241
 242         if (!bridge)
 243                 return NULL;
 244
 245         cur_memory = atomic_read(&bridge->current_memory_agp);
 246         if ((cur_memory + page_count > bridge->max_memory_agp) ||
 247             (cur_memory + page_count < page_count))
 248                 return NULL;
 249
 250         if (type >= AGP_USER_TYPES) {
 251                 new = agp_generic_alloc_user(page_count, type);
 252                 if (new)
 253                         new->bridge = bridge;
 254                 return new;
 255         }
 256
 257         if (type != 0) {
 258                 new = bridge->driver->alloc_by_type(page_count, type);
 259                 if (new)
 260                         new->bridge = bridge;
 261                 return new;
 262         }
 263
 264         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 265
 266         new = agp_create_memory(scratch_pages);
 267
 268         if (new == NULL)
 269                 return NULL;
 270
 271         if (bridge->driver->agp_alloc_pages) {
 272                 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
 273                         agp_free_memory(new);
 274                         return NULL;
 275                 }
 276                 new->bridge = bridge;
 277                 return new;
 278         }
 279
 280         for (i = 0; i < page_count; i++) {
 281                 struct page *page = bridge->driver->agp_alloc_page(bridge);
 282
 283                 if (page == NULL) {
 284                         agp_free_memory(new);
 285                         return NULL;
 286                 }
 287                 new->pages[i] = page;
 288                 new->page_count++;
 289         }
 290         new->bridge = bridge;
 291
 292         return new;
 293 }
 294 EXPORT_SYMBOL(agp_allocate_memory);
 295
 296
 297 /* End - Generic routines for handling agp_memory structures */
 298
 299
 300 static int agp_return_size(void)
 301 {
 302         int current_size;
 303         void *temp;
 304
 305         temp = agp_bridge->current_size;
 306
 307         switch (agp_bridge->driver->size_type) {
 308         case U8_APER_SIZE:
 309                 current_size = A_SIZE_8(temp)->size;
 310                 break;
 311         case U16_APER_SIZE:
 312                 current_size = A_SIZE_16(temp)->size;
 313                 break;
 314         case U32_APER_SIZE:
 315                 current_size = A_SIZE_32(temp)->size;
 316                 break;
 317         case LVL2_APER_SIZE:
 318                 current_size = A_SIZE_LVL2(temp)->size;
 319                 break;
 320         case FIXED_APER_SIZE:
 321                 current_size = A_SIZE_FIX(temp)->size;
 322                 break;
 323         default:
 324                 current_size = 0;
 325                 break;
 326         }
 327
 328         current_size -= (agp_memory_reserved / (1024*1024));
 329         if (current_size <0)
 330                 current_size = 0;
 331         return current_size;
 332 }
 333
 334
 335 int agp_num_entries(void)
 336 {
 337         int num_entries;
 338         void *temp;
 339
 340         temp = agp_bridge->current_size;
 341
 342         switch (agp_bridge->driver->size_type) {
 343         case U8_APER_SIZE:
 344                 num_entries = A_SIZE_8(temp)->num_entries;
 345                 break;
 346         case U16_APER_SIZE:
 347                 num_entries = A_SIZE_16(temp)->num_entries;
 348                 break;
 349         case U32_APER_SIZE:
 350                 num_entries = A_SIZE_32(temp)->num_entries;
 351                 break;
 352         case LVL2_APER_SIZE:
 353                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 354                 break;
 355         case FIXED_APER_SIZE:
 356                 num_entries = A_SIZE_FIX(temp)->num_entries;
 357                 break;
 358         default:
 359                 num_entries = 0;
 360                 break;
 361         }
 362
 363         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 364         if (num_entries<0)
 365                 num_entries = 0;
 366         return num_entries;
 367 }
 368 EXPORT_SYMBOL_GPL(agp_num_entries);
 369
 370
 371 /**
 372  *      agp_copy_info  -  copy bridge state information
 373  *
 374  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 375  *
 376  *      This function copies information about the agp bridge device and the state of
 377  *      the agp backend into an agp_kern_info pointer.
 378  */
 379 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 380 {
 381         memset(info, 0, sizeof(struct agp_kern_info));
 382         if (!bridge) {
 383                 info->chipset = NOT_SUPPORTED;
 384                 return -EIO;
 385         }
 386
 387         info->version.major = bridge->version->major;
 388         info->version.minor = bridge->version->minor;
 389         info->chipset = SUPPORTED;
 390         info->device = bridge->dev;
 391         if (bridge->mode & AGPSTAT_MODE_3_0)
 392                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 393         else
 394                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 395         info->aper_base = bridge->gart_bus_addr;
 396         info->aper_size = agp_return_size();
 397         info->max_memory = bridge->max_memory_agp;
 398         info->current_memory = atomic_read(&bridge->current_memory_agp);
 399         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 400         info->vm_ops = bridge->vm_ops;
 401         info->page_mask = ~0UL;
 402         return 0;
 403 }
 404 EXPORT_SYMBOL(agp_copy_info);
 405
 406 /* End - Routine to copy over information structure */
 407
 408 /*
 409  * Routines for handling swapping of agp_memory into the GATT -
 410  * These routines take agp_memory and insert them into the GATT.
 411  * They call device specific routines to actually write to the GATT.
 412  */
 413
 414 /**
 415  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 416  *
 417  *      @curr:          agp_memory pointer
 418  *      @pg_start:      an offset into the graphics aperture translation table
 419  *
 420  *      It returns -EINVAL if the pointer == NULL.
 421  *      It returns -EBUSY if the area of the table requested is already in use.
 422  */
 423 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 424 {
 425         int ret_val;
 426
 427         if (curr == NULL)
 428                 return -EINVAL;
 429
 430         if (curr->is_bound) {
 431                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
 432                 return -EINVAL;
 433         }
 434         if (!curr->is_flushed) {
 435                 curr->bridge->driver->cache_flush();
 436                 curr->is_flushed = true;
 437         }
 438
 439         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 440
 441         if (ret_val != 0)
 442                 return ret_val;
 443
 444         curr->is_bound = true;
 445         curr->pg_start = pg_start;
 446         spin_lock(&agp_bridge->mapped_lock);
 447         list_add(&curr->mapped_list, &agp_bridge->mapped_list);
 448         spin_unlock(&agp_bridge->mapped_lock);
 449
 450         return 0;
 451 }
 452 EXPORT_SYMBOL(agp_bind_memory);
 453
 454
 455 /**
 456  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 457  *
 458  * @curr:       agp_memory pointer to be removed from the GATT.
 459  *
 460  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 461  * the graphics aperture translation table or if the agp_memory pointer == NULL
 462  */
 463 int agp_unbind_memory(struct agp_memory *curr)
 464 {
 465         int ret_val;
 466
 467         if (curr == NULL)
 468                 return -EINVAL;
 469
 470         if (!curr->is_bound) {
 471                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
 472                 return -EINVAL;
 473         }
 474
 475         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 476
 477         if (ret_val != 0)
 478                 return ret_val;
 479
 480         curr->is_bound = false;
 481         curr->pg_start = 0;
 482         spin_lock(&curr->bridge->mapped_lock);
 483         list_del(&curr->mapped_list);
 484         spin_unlock(&curr->bridge->mapped_lock);
 485         return 0;
 486 }
 487 EXPORT_SYMBOL(agp_unbind_memory);
 488
 489
 490 /* End - Routines for handling swapping of agp_memory into the GATT */
 491
 492
 493 /* Generic Agp routines - Start */
 494 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 495 {
 496         u32 tmp;
 497
 498         if (*requested_mode & AGP2_RESERVED_MASK) {
 499                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 500                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
 501                 *requested_mode &= ~AGP2_RESERVED_MASK;
 502         }
 503
 504         /*
 505          * Some dumb bridges are programmed to disobey the AGP2 spec.
 506          * This is likely a BIOS misprogramming rather than poweron default, or
 507          * it would be a lot more common.
 508          * https://bugs.freedesktop.org/show_bug.cgi?id=8816
 509          * AGPv2 spec 6.1.9 states:
 510          *   The RATE field indicates the data transfer rates supported by this
 511          *   device. A.G.P. devices must report all that apply.
 512          * Fix them up as best we can.
 513          */
 514         switch (*bridge_agpstat & 7) {
 515         case 4:
 516                 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
 517                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
 518                         "Fixing up support for x2 & x1\n");
 519                 break;
 520         case 2:
 521                 *bridge_agpstat |= AGPSTAT2_1X;
 522                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
 523                         "Fixing up support for x1\n");
 524                 break;
 525         default:
 526                 break;
 527         }
 528
 529         /* Check the speed bits make sense. Only one should be set. */
 530         tmp = *requested_mode & 7;
 531         switch (tmp) {
 532                 case 0:
 533                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 534                         *requested_mode |= AGPSTAT2_1X;
 535                         break;
 536                 case 1:
 537                 case 2:
 538                         break;
 539                 case 3:
 540                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 541                         break;
 542                 case 4:
 543                         break;
 544                 case 5:
 545                 case 6:
 546                 case 7:
 547                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 548                         break;
 549         }
 550
 551         /* disable SBA if it's not supported */
 552         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 553                 *bridge_agpstat &= ~AGPSTAT_SBA;
 554
 555         /* Set rate */
 556         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 557                 *bridge_agpstat &= ~AGPSTAT2_4X;
 558
 559         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 560                 *bridge_agpstat &= ~AGPSTAT2_2X;
 561
 562         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 563                 *bridge_agpstat &= ~AGPSTAT2_1X;
 564
 565         /* Now we know what mode it should be, clear out the unwanted bits. */
 566         if (*bridge_agpstat & AGPSTAT2_4X)
 567                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 568
 569         if (*bridge_agpstat & AGPSTAT2_2X)
 570                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 571
 572         if (*bridge_agpstat & AGPSTAT2_1X)
 573                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 574
 575         /* Apply any errata. */
 576         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 577                 *bridge_agpstat &= ~AGPSTAT_FW;
 578
 579         if (agp_bridge->flags & AGP_ERRATA_SBA)
 580                 *bridge_agpstat &= ~AGPSTAT_SBA;
 581
 582         if (agp_bridge->flags & AGP_ERRATA_1X) {
 583                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 584                 *bridge_agpstat |= AGPSTAT2_1X;
 585         }
 586
 587         /* If we've dropped down to 1X, disable fast writes. */
 588         if (*bridge_agpstat & AGPSTAT2_1X)
 589                 *bridge_agpstat &= ~AGPSTAT_FW;
 590 }
 591
 592 /*
 593  * requested_mode = Mode requested by (typically) X.
 594  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 595  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 596  */
 597 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 598 {
 599         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 600         u32 tmp;
 601
 602         if (*requested_mode & AGP3_RESERVED_MASK) {
 603                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 604                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
 605                 *requested_mode &= ~AGP3_RESERVED_MASK;
 606         }
 607
 608         /* Check the speed bits make sense. */
 609         tmp = *requested_mode & 7;
 610         if (tmp == 0) {
 611                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 612                 *requested_mode |= AGPSTAT3_4X;
 613         }
 614         if (tmp >= 3) {
 615                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 616                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 617         }
 618
 619         /* ARQSZ - Set the value to the maximum one.
 620          * Don't allow the mode register to override values. */
 621         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 622                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 623
 624         /* Calibration cycle.
 625          * Don't allow the mode register to override values. */
 626         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 627                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 628
 629         /* SBA *must* be supported for AGP v3 */
 630         *bridge_agpstat |= AGPSTAT_SBA;
 631
 632         /*
 633          * Set speed.
 634          * Check for invalid speeds. This can happen when applications
 635          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 636          */
 637         if (*requested_mode & AGPSTAT_MODE_3_0) {
 638                 /*
 639                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 640                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 641                  * AGP2.x 4x -> AGP3.0 4x.
 642                  */
 643                 if (*requested_mode & AGPSTAT2_4X) {
 644                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 645                                                 current->comm, *requested_mode);
 646                         *requested_mode &= ~AGPSTAT2_4X;
 647                         *requested_mode |= AGPSTAT3_4X;
 648                 }
 649         } else {
 650                 /*
 651                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 652                  * but have been passed an AGP 2.x mode.
 653                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 654                  */
 655                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 656                                         current->comm, *requested_mode);
 657                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 658                 *requested_mode |= AGPSTAT3_4X;
 659         }
 660
 661         if (*requested_mode & AGPSTAT3_8X) {
 662                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 663                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 664                         *bridge_agpstat |= AGPSTAT3_4X;
 665                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
 666                         return;
 667                 }
 668                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 669                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 670                         *bridge_agpstat |= AGPSTAT3_4X;
 671                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
 672                         return;
 673                 }
 674                 /* All set, bridge & device can do AGP x8*/
 675                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 676                 goto done;
 677
 678         } else if (*requested_mode & AGPSTAT3_4X) {
 679                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 680                 *bridge_agpstat |= AGPSTAT3_4X;
 681                 goto done;
 682
 683         } else {
 684
 685                 /*
 686                  * If we didn't specify an AGP mode, we see if both
 687                  * the graphics card, and the bridge can do x8, and use if so.
 688                  * If not, we fall back to x4 mode.
 689                  */
 690                 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
 691                         printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
 692                                 "supported by bridge & card (x8).\n");
 693                         *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 694                         *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 695                 } else {
 696                         printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
 697                         if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 698                                 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
 699                                         *bridge_agpstat, origbridge);
 700                                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 701                                 *bridge_agpstat |= AGPSTAT3_4X;
 702                         }
 703                         if (!(*vga_agpstat & AGPSTAT3_8X)) {
 704                                 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
 705                                         *vga_agpstat, origvga);
 706                                 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 707                                 *vga_agpstat |= AGPSTAT3_4X;
 708                         }
 709                 }
 710         }
 711
 712 done:
 713         /* Apply any errata. */
 714         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 715                 *bridge_agpstat &= ~AGPSTAT_FW;
 716
 717         if (agp_bridge->flags & AGP_ERRATA_SBA)
 718                 *bridge_agpstat &= ~AGPSTAT_SBA;
 719
 720         if (agp_bridge->flags & AGP_ERRATA_1X) {
 721                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 722                 *bridge_agpstat |= AGPSTAT2_1X;
 723         }
 724 }
 725
 726
 727 /**
 728  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 729  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 730  * @requested_mode: requested agp_stat from userspace (Typically from X)
 731  * @bridge_agpstat: current agp_stat from AGP bridge.
 732  *
 733  * This function will hunt for an AGP graphics card, and try to match
 734  * the requested mode to the capabilities of both the bridge and the card.
 735  */
 736 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 737 {
 738         struct pci_dev *device = NULL;
 739         u32 vga_agpstat;
 740         u8 cap_ptr;
 741
 742         for (;;) {
 743                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 744                 if (!device) {
 745                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 746                         return 0;
 747                 }
 748                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 749                 if (cap_ptr)
 750                         break;
 751         }
 752
 753         /*
 754          * Ok, here we have a AGP device. Disable impossible
 755          * settings, and adjust the readqueue to the minimum.
 756          */
 757         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 758
 759         /* adjust RQ depth */
 760         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 761              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 762                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 763
 764         /* disable FW if it's not supported */
 765         if (!((bridge_agpstat & AGPSTAT_FW) &&
 766                  (vga_agpstat & AGPSTAT_FW) &&
 767                  (requested_mode & AGPSTAT_FW)))
 768                 bridge_agpstat &= ~AGPSTAT_FW;
 769
 770         /* Check to see if we are operating in 3.0 mode */
 771         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 772                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 773         else
 774                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 775
 776         pci_dev_put(device);
 777         return bridge_agpstat;
 778 }
 779 EXPORT_SYMBOL(agp_collect_device_status);
 780
 781
 782 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
 783 {
 784         struct pci_dev *device = NULL;
 785         int mode;
 786
 787         mode = bridge_agpstat & 0x7;
 788         if (agp_v3)
 789                 mode *= 4;
 790
 791         for_each_pci_dev(device) {
 792                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 793                 if (!agp)
 794                         continue;
 795
 796                 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
 797                          agp_v3 ? 3 : 2, mode);
 798                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 799         }
 800 }
 801 EXPORT_SYMBOL(agp_device_command);
 802
 803
 804 void get_agp_version(struct agp_bridge_data *bridge)
 805 {
 806         u32 ncapid;
 807
 808         /* Exit early if already set by errata workarounds. */
 809         if (bridge->major_version != 0)
 810                 return;
 811
 812         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 813         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 814         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 815 }
 816 EXPORT_SYMBOL(get_agp_version);
 817
 818
 819 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 820 {
 821         u32 bridge_agpstat, temp;
 822
 823         get_agp_version(agp_bridge);
 824
 825         dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
 826                  agp_bridge->major_version, agp_bridge->minor_version);
 827
 828         pci_read_config_dword(agp_bridge->dev,
 829                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 830
 831         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 832         if (bridge_agpstat == 0)
 833                 /* Something bad happened. FIXME: Return error code? */
 834                 return;
 835
 836         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 837
 838         /* Do AGP version specific frobbing. */
 839         if (bridge->major_version >= 3) {
 840                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 841                         /* If we have 3.5, we can do the isoch stuff. */
 842                         if (bridge->minor_version >= 5)
 843                                 agp_3_5_enable(bridge);
 844                         agp_device_command(bridge_agpstat, true);
 845                         return;
 846                 } else {
 847                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 848                     bridge_agpstat &= ~(7<<10) ;
 849                     pci_read_config_dword(bridge->dev,
 850                                         bridge->capndx+AGPCTRL, &temp);
 851                     temp |= (1<<9);
 852                     pci_write_config_dword(bridge->dev,
 853                                         bridge->capndx+AGPCTRL, temp);
 854
 855                     dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
 856                 }
 857         }
 858
 859         /* AGP v<3 */
 860         agp_device_command(bridge_agpstat, false);
 861 }
 862 EXPORT_SYMBOL(agp_generic_enable);
 863
 864
 865 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 866 {
 867         char *table;
 868         char *table_end;
 869         int size;
 870         int page_order;
 871         int num_entries;
 872         int i;
 873         void *temp;
 874         struct page *page;
 875
 876         /* The generic routines can't handle 2 level gatt's */
 877         if (bridge->driver->size_type == LVL2_APER_SIZE)
 878                 return -EINVAL;
 879
 880         table = NULL;
 881         i = bridge->aperture_size_idx;
 882         temp = bridge->current_size;
 883         size = page_order = num_entries = 0;
 884
 885         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 886                 do {
 887                         switch (bridge->driver->size_type) {
 888                         case U8_APER_SIZE:
 889                                 size = A_SIZE_8(temp)->size;
 890                                 page_order =
 891                                     A_SIZE_8(temp)->page_order;
 892                                 num_entries =
 893                                     A_SIZE_8(temp)->num_entries;
 894                                 break;
 895                         case U16_APER_SIZE:
 896                                 size = A_SIZE_16(temp)->size;
 897                                 page_order = A_SIZE_16(temp)->page_order;
 898                                 num_entries = A_SIZE_16(temp)->num_entries;
 899                                 break;
 900                         case U32_APER_SIZE:
 901                                 size = A_SIZE_32(temp)->size;
 902                                 page_order = A_SIZE_32(temp)->page_order;
 903                                 num_entries = A_SIZE_32(temp)->num_entries;
 904                                 break;
 905                                 /* This case will never really happen. */
 906                         case FIXED_APER_SIZE:
 907                         case LVL2_APER_SIZE:
 908                         default:
 909                                 size = page_order = num_entries = 0;
 910                                 break;
 911                         }
 912
 913                         table = alloc_gatt_pages(page_order);
 914
 915                         if (table == NULL) {
 916                                 i++;
 917                                 switch (bridge->driver->size_type) {
 918                                 case U8_APER_SIZE:
 919                                         bridge->current_size = A_IDX8(bridge);
 920                                         break;
 921                                 case U16_APER_SIZE:
 922                                         bridge->current_size = A_IDX16(bridge);
 923                                         break;
 924                                 case U32_APER_SIZE:
 925                                         bridge->current_size = A_IDX32(bridge);
 926                                         break;
 927                                 /* These cases will never really happen. */
 928                                 case FIXED_APER_SIZE:
 929                                 case LVL2_APER_SIZE:
 930                                 default:
 931                                         break;
 932                                 }
 933                                 temp = bridge->current_size;
 934                         } else {
 935                                 bridge->aperture_size_idx = i;
 936                         }
 937                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 938         } else {
 939                 size = ((struct aper_size_info_fixed *) temp)->size;
 940                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 941                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 942                 table = alloc_gatt_pages(page_order);
 943         }
 944
 945         if (table == NULL)
 946                 return -ENOMEM;
 947
 948         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 949
 950         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 951                 SetPageReserved(page);
 952
 953         bridge->gatt_table_real = (u32 *) table;
 954         agp_gatt_table = (void *)table;
 955
 956         bridge->driver->cache_flush();
 957 #ifdef CONFIG_X86
 958         if (set_memory_uc((unsigned long)table, 1 << page_order))
 959                 printk(KERN_WARNING "Could not set GATT table memory to UC!");
 960
 961         bridge->gatt_table = (void *)table;
 962 #else
 963         bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
 964                                         (PAGE_SIZE * (1 << page_order)));
 965         bridge->driver->cache_flush();
 966 #endif
 967
 968         if (bridge->gatt_table == NULL) {
 969                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 970                         ClearPageReserved(page);
 971
 972                 free_gatt_pages(table, page_order);
 973
 974                 return -ENOMEM;
 975         }
 976         bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
 977
 978         /* AK: bogus, should encode addresses > 4GB */
 979         for (i = 0; i < num_entries; i++) {
 980                 writel(bridge->scratch_page, bridge->gatt_table+i);
 981                 readl(bridge->gatt_table+i);    /* PCI Posting. */
 982         }
 983
 984         return 0;
 985 }
 986 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 987
 988 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
 989 {
 990         int page_order;
 991         char *table, *table_end;
 992         void *temp;
 993         struct page *page;
 994
 995         temp = bridge->current_size;
 996
 997         switch (bridge->driver->size_type) {
 998         case U8_APER_SIZE:
 999                 page_order = A_SIZE_8(temp)->page_order;
1000                 break;
1001         case U16_APER_SIZE:
1002                 page_order = A_SIZE_16(temp)->page_order;
1003                 break;
1004         case U32_APER_SIZE:
1005                 page_order = A_SIZE_32(temp)->page_order;
1006                 break;
1007         case FIXED_APER_SIZE:
1008                 page_order = A_SIZE_FIX(temp)->page_order;
1009                 break;
1010         case LVL2_APER_SIZE:
1011                 /* The generic routines can't deal with 2 level gatt's */
1012                 return -EINVAL;
1013                 break;
1014         default:
1015                 page_order = 0;
1016                 break;
1017         }
1018
1019         /* Do not worry about freeing memory, because if this is
1020          * called, then all agp memory is deallocated and removed
1021          * from the table. */
1022
1023 #ifdef CONFIG_X86
1024         set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1025 #else
1026         iounmap(bridge->gatt_table);
1027 #endif
1028         table = (char *) bridge->gatt_table_real;
1029         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1030
1031         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1032                 ClearPageReserved(page);
1033
1034         free_gatt_pages(bridge->gatt_table_real, page_order);
1035
1036         agp_gatt_table = NULL;
1037         bridge->gatt_table = NULL;
1038         bridge->gatt_table_real = NULL;
1039         bridge->gatt_bus_addr = 0;
1040
1041         return 0;
1042 }
1043 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1044
1045
1046 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1047 {
1048         int num_entries;
1049         size_t i;
1050         off_t j;
1051         void *temp;
1052         struct agp_bridge_data *bridge;
1053         int mask_type;
1054
1055         bridge = mem->bridge;
1056         if (!bridge)
1057                 return -EINVAL;
1058
1059         if (mem->page_count == 0)
1060                 return 0;
1061
1062         temp = bridge->current_size;
1063
1064         switch (bridge->driver->size_type) {
1065         case U8_APER_SIZE:
1066                 num_entries = A_SIZE_8(temp)->num_entries;
1067                 break;
1068         case U16_APER_SIZE:
1069                 num_entries = A_SIZE_16(temp)->num_entries;
1070                 break;
1071         case U32_APER_SIZE:
1072                 num_entries = A_SIZE_32(temp)->num_entries;
1073                 break;
1074         case FIXED_APER_SIZE:
1075                 num_entries = A_SIZE_FIX(temp)->num_entries;
1076                 break;
1077         case LVL2_APER_SIZE:
1078                 /* The generic routines can't deal with 2 level gatt's */
1079                 return -EINVAL;
1080                 break;
1081         default:
1082                 num_entries = 0;
1083                 break;
1084         }
1085
1086         num_entries -= agp_memory_reserved/PAGE_SIZE;
1087         if (num_entries < 0) num_entries = 0;
1088
1089         if (type != mem->type)
1090                 return -EINVAL;
1091
1092         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1093         if (mask_type != 0) {
1094                 /* The generic routines know nothing of memory types */
1095                 return -EINVAL;
1096         }
1097
1098         if (((pg_start + mem->page_count) > num_entries) ||
1099             ((pg_start + mem->page_count) < pg_start))
1100                 return -EINVAL;
1101
1102         j = pg_start;
1103
1104         while (j < (pg_start + mem->page_count)) {
1105                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1106                         return -EBUSY;
1107                 j++;
1108         }
1109
1110         if (!mem->is_flushed) {
1111                 bridge->driver->cache_flush();
1112                 mem->is_flushed = true;
1113         }
1114
1115         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1116                 writel(bridge->driver->mask_memory(bridge,
1117                                                    page_to_phys(mem->pages[i]),
1118                                                    mask_type),
1119                        bridge->gatt_table+j);
1120         }
1121         readl(bridge->gatt_table+j-1);  /* PCI Posting. */
1122
1123         bridge->driver->tlb_flush(mem);
1124         return 0;
1125 }
1126 EXPORT_SYMBOL(agp_generic_insert_memory);
1127
1128
1129 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1130 {
1131         size_t i;
1132         struct agp_bridge_data *bridge;
1133         int mask_type, num_entries;
1134
1135         bridge = mem->bridge;
1136         if (!bridge)
1137                 return -EINVAL;
1138
1139         if (mem->page_count == 0)
1140                 return 0;
1141
1142         if (type != mem->type)
1143                 return -EINVAL;
1144
1145         num_entries = agp_num_entries();
1146         if (((pg_start + mem->page_count) > num_entries) ||
1147             ((pg_start + mem->page_count) < pg_start))
1148                 return -EINVAL;
1149
1150         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1151         if (mask_type != 0) {
1152                 /* The generic routines know nothing of memory types */
1153                 return -EINVAL;
1154         }
1155
1156         /* AK: bogus, should encode addresses > 4GB */
1157         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1158                 writel(bridge->scratch_page, bridge->gatt_table+i);
1159         }
1160         readl(bridge->gatt_table+i-1);  /* PCI Posting. */
1161
1162         bridge->driver->tlb_flush(mem);
1163         return 0;
1164 }
1165 EXPORT_SYMBOL(agp_generic_remove_memory);
1166
1167 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1168 {
1169         return NULL;
1170 }
1171 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1172
1173 void agp_generic_free_by_type(struct agp_memory *curr)
1174 {
1175         agp_free_page_array(curr);
1176         agp_free_key(curr->key);
1177         kfree(curr);
1178 }
1179 EXPORT_SYMBOL(agp_generic_free_by_type);
1180
1181 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1182 {
1183         struct agp_memory *new;
1184         int i;
1185         int pages;
1186
1187         pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1188         new = agp_create_user_memory(page_count);
1189         if (new == NULL)
1190                 return NULL;
1191
1192         for (i = 0; i < page_count; i++)
1193                 new->pages[i] = NULL;
1194         new->page_count = 0;
1195         new->type = type;
1196         new->num_scratch_pages = pages;
1197
1198         return new;
1199 }
1200 EXPORT_SYMBOL(agp_generic_alloc_user);
1201
1202 /*
1203  * Basic Page Allocation Routines -
1204  * These routines handle page allocation and by default they reserve the allocated
1205  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1206  * against a maximum value.
1207  */
1208
1209 int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1210 {
1211         struct page * page;
1212         int i, ret = -ENOMEM;
1213
1214         for (i = 0; i < num_pages; i++) {
1215                 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1216                 /* agp_free_memory() needs gart address */
1217                 if (page == NULL)
1218                         goto out;
1219
1220 #ifndef CONFIG_X86
1221                 map_page_into_agp(page);
1222 #endif
1223                 get_page(page);
1224                 atomic_inc(&agp_bridge->current_memory_agp);
1225
1226                 mem->pages[i] = page;
1227                 mem->page_count++;
1228         }
1229
1230 #ifdef CONFIG_X86
1231         set_pages_array_uc(mem->pages, num_pages);
1232 #endif
1233         ret = 0;
1234 out:
1235         return ret;
1236 }
1237 EXPORT_SYMBOL(agp_generic_alloc_pages);
1238
1239 struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1240 {
1241         struct page * page;
1242
1243         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1244         if (page == NULL)
1245                 return NULL;
1246
1247         map_page_into_agp(page);
1248
1249         get_page(page);
1250         atomic_inc(&agp_bridge->current_memory_agp);
1251         return page;
1252 }
1253 EXPORT_SYMBOL(agp_generic_alloc_page);
1254
1255 void agp_generic_destroy_pages(struct agp_memory *mem)
1256 {
1257         int i;
1258         struct page *page;
1259
1260         if (!mem)
1261                 return;
1262
1263 #ifdef CONFIG_X86
1264         set_pages_array_wb(mem->pages, mem->page_count);
1265 #endif
1266
1267         for (i = 0; i < mem->page_count; i++) {
1268                 page = mem->pages[i];
1269
1270 #ifndef CONFIG_X86
1271                 unmap_page_from_agp(page);
1272 #endif
1273                 put_page(page);
1274                 __free_page(page);
1275                 atomic_dec(&agp_bridge->current_memory_agp);
1276                 mem->pages[i] = NULL;
1277         }
1278 }
1279 EXPORT_SYMBOL(agp_generic_destroy_pages);
1280
1281 void agp_generic_destroy_page(struct page *page, int flags)
1282 {
1283         if (page == NULL)
1284                 return;
1285
1286         if (flags & AGP_PAGE_DESTROY_UNMAP)
1287                 unmap_page_from_agp(page);
1288
1289         if (flags & AGP_PAGE_DESTROY_FREE) {
1290                 put_page(page);
1291                 __free_page(page);
1292                 atomic_dec(&agp_bridge->current_memory_agp);
1293         }
1294 }
1295 EXPORT_SYMBOL(agp_generic_destroy_page);
1296
1297 /* End Basic Page Allocation Routines */
1298
1299
1300 /**
1301  * agp_enable  -  initialise the agp point-to-point connection.
1302  *
1303  * @mode:       agp mode register value to configure with.
1304  */
1305 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1306 {
1307         if (!bridge)
1308                 return;
1309         bridge->driver->agp_enable(bridge, mode);
1310 }
1311 EXPORT_SYMBOL(agp_enable);
1312
1313 /* When we remove the global variable agp_bridge from all drivers
1314  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1315  */
1316
1317 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1318 {
1319         if (list_empty(&agp_bridges))
1320                 return NULL;
1321
1322         return agp_bridge;
1323 }
1324
1325 static void ipi_handler(void *null)
1326 {
1327         flush_agp_cache();
1328 }
1329
1330 void global_cache_flush(void)
1331 {
1332         if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1333                 panic(PFX "timed out waiting for the other CPUs!\n");
1334 }
1335 EXPORT_SYMBOL(global_cache_flush);
1336
1337 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1338                                       dma_addr_t addr, int type)
1339 {
1340         /* memory type is ignored in the generic routine */
1341         if (bridge->driver->masks)
1342                 return addr | bridge->driver->masks[0].mask;
1343         else
1344                 return addr;
1345 }
1346 EXPORT_SYMBOL(agp_generic_mask_memory);
1347
1348 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1349                                   int type)
1350 {
1351         if (type >= AGP_USER_TYPES)
1352                 return 0;
1353         return type;
1354 }
1355 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1356
1357 /*
1358  * These functions are implemented according to the AGPv3 spec,
1359  * which covers implementation details that had previously been
1360  * left open.
1361  */
1362
1363 int agp3_generic_fetch_size(void)
1364 {
1365         u16 temp_size;
1366         int i;
1367         struct aper_size_info_16 *values;
1368
1369         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1370         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1371
1372         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1373                 if (temp_size == values[i].size_value) {
1374                         agp_bridge->previous_size =
1375                                 agp_bridge->current_size = (void *) (values + i);
1376
1377                         agp_bridge->aperture_size_idx = i;
1378                         return values[i].size;
1379                 }
1380         }
1381         return 0;
1382 }
1383 EXPORT_SYMBOL(agp3_generic_fetch_size);
1384
1385 void agp3_generic_tlbflush(struct agp_memory *mem)
1386 {
1387         u32 ctrl;
1388         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1389         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1390         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1391 }
1392 EXPORT_SYMBOL(agp3_generic_tlbflush);
1393
1394 int agp3_generic_configure(void)
1395 {
1396         u32 temp;
1397         struct aper_size_info_16 *current_size;
1398
1399         current_size = A_SIZE_16(agp_bridge->current_size);
1400
1401         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1402         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1403
1404         /* set aperture size */
1405         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1406         /* set gart pointer */
1407         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1408         /* enable aperture and GTLB */
1409         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1410         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1411         return 0;
1412 }
1413 EXPORT_SYMBOL(agp3_generic_configure);
1414
1415 void agp3_generic_cleanup(void)
1416 {
1417         u32 ctrl;
1418         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1419         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1420 }
1421 EXPORT_SYMBOL(agp3_generic_cleanup);
1422
1423 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1424 {
1425         {4096, 1048576, 10,0x000},
1426         {2048,  524288, 9, 0x800},
1427         {1024,  262144, 8, 0xc00},
1428         { 512,  131072, 7, 0xe00},
1429         { 256,   65536, 6, 0xf00},
1430         { 128,   32768, 5, 0xf20},
1431         {  64,   16384, 4, 0xf30},
1432         {  32,    8192, 3, 0xf38},
1433         {  16,    4096, 2, 0xf3c},
1434         {   8,    2048, 1, 0xf3e},
1435         {   4,    1024, 0, 0xf3f}
1436 };
1437 EXPORT_SYMBOL(agp3_generic_sizes);
1438