drivers/char/agp/generic.c

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