err.no Git - linux-2.6/blob - drivers/char/agp/generic.c

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