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