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         if (INT_MAX/sizeof(struct page *) < num_agp_pages)
 127                 return NULL;
 128
 129         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 130         if (new == NULL)
 131                 return NULL;
 132
 133         new->key = agp_get_key();
 134
 135         if (new->key < 0) {
 136                 kfree(new);
 137                 return NULL;
 138         }
 139
 140         agp_alloc_page_array(alloc_size, new);
 141
 142         if (new->pages == NULL) {
 143                 agp_free_key(new->key);
 144                 kfree(new);
 145                 return NULL;
 146         }
 147         new->num_scratch_pages = 0;
 148         return new;
 149 }
 150
 151 struct agp_memory *agp_create_memory(int scratch_pages)
 152 {
 153         struct agp_memory *new;
 154
 155         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 156         if (new == NULL)
 157                 return NULL;
 158
 159         new->key = agp_get_key();
 160
 161         if (new->key < 0) {
 162                 kfree(new);
 163                 return NULL;
 164         }
 165
 166         agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
 167
 168         if (new->pages == NULL) {
 169                 agp_free_key(new->key);
 170                 kfree(new);
 171                 return NULL;
 172         }
 173         new->num_scratch_pages = scratch_pages;
 174         new->type = AGP_NORMAL_MEMORY;
 175         return new;
 176 }
 177 EXPORT_SYMBOL(agp_create_memory);
 178
 179 /**
 180  *      agp_free_memory - free memory associated with an agp_memory pointer.
 181  *
 182  *      @curr:          agp_memory pointer to be freed.
 183  *
 184  *      It is the only function that can be called when the backend is not owned
 185  *      by the caller.  (So it can free memory on client death.)
 186  */
 187 void agp_free_memory(struct agp_memory *curr)
 188 {
 189         size_t i;
 190
 191         if (curr == NULL)
 192                 return;
 193
 194         if (curr->is_bound)
 195                 agp_unbind_memory(curr);
 196
 197         if (curr->type >= AGP_USER_TYPES) {
 198                 agp_generic_free_by_type(curr);
 199                 return;
 200         }
 201
 202         if (curr->type != 0) {
 203                 curr->bridge->driver->free_by_type(curr);
 204                 return;
 205         }
 206         if (curr->page_count != 0) {
 207                 if (curr->bridge->driver->agp_destroy_pages) {
 208                         curr->bridge->driver->agp_destroy_pages(curr);
 209                 } else {
 210
 211                         for (i = 0; i < curr->page_count; i++) {
 212                                 curr->bridge->driver->agp_destroy_page(
 213                                         curr->pages[i],
 214                                         AGP_PAGE_DESTROY_UNMAP);
 215                         }
 216                         for (i = 0; i < curr->page_count; i++) {
 217                                 curr->bridge->driver->agp_destroy_page(
 218                                         curr->pages[i],
 219                                         AGP_PAGE_DESTROY_FREE);
 220                         }
 221                 }
 222         }
 223         agp_free_key(curr->key);
 224         agp_free_page_array(curr);
 225         kfree(curr);
 226 }
 227 EXPORT_SYMBOL(agp_free_memory);
 228
 229 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 230
 231 /**
 232  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 233  *
 234  *      @page_count:    size_t argument of the number of pages
 235  *      @type:  u32 argument of the type of memory to be allocated.
 236  *
 237  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 238  *      maps to physical ram.  Any other type is device dependent.
 239  *
 240  *      It returns NULL whenever memory is unavailable.
 241  */
 242 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 243                                         size_t page_count, u32 type)
 244 {
 245         int scratch_pages;
 246         struct agp_memory *new;
 247         size_t i;
 248         int cur_memory;
 249
 250         if (!bridge)
 251                 return NULL;
 252
 253         cur_memory = atomic_read(&bridge->current_memory_agp);
 254         if ((cur_memory + page_count > bridge->max_memory_agp) ||
 255             (cur_memory + page_count < page_count))
 256                 return NULL;
 257
 258         if (type >= AGP_USER_TYPES) {
 259                 new = agp_generic_alloc_user(page_count, type);
 260                 if (new)
 261                         new->bridge = bridge;
 262                 return new;
 263         }
 264
 265         if (type != 0) {
 266                 new = bridge->driver->alloc_by_type(page_count, type);
 267                 if (new)
 268                         new->bridge = bridge;
 269                 return new;
 270         }
 271
 272         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 273
 274         new = agp_create_memory(scratch_pages);
 275
 276         if (new == NULL)
 277                 return NULL;
 278
 279         if (bridge->driver->agp_alloc_pages) {
 280                 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
 281                         agp_free_memory(new);
 282                         return NULL;
 283                 }
 284                 new->bridge = bridge;
 285                 return new;
 286         }
 287
 288         for (i = 0; i < page_count; i++) {
 289                 struct page *page = bridge->driver->agp_alloc_page(bridge);
 290
 291                 if (page == NULL) {
 292                         agp_free_memory(new);
 293                         return NULL;
 294                 }
 295                 new->pages[i] = page;
 296                 new->page_count++;
 297         }
 298         new->bridge = bridge;
 299
 300         return new;
 301 }
 302 EXPORT_SYMBOL(agp_allocate_memory);
 303
 304
 305 /* End - Generic routines for handling agp_memory structures */
 306
 307
 308 static int agp_return_size(void)
 309 {
 310         int current_size;
 311         void *temp;
 312
 313         temp = agp_bridge->current_size;
 314
 315         switch (agp_bridge->driver->size_type) {
 316         case U8_APER_SIZE:
 317                 current_size = A_SIZE_8(temp)->size;
 318                 break;
 319         case U16_APER_SIZE:
 320                 current_size = A_SIZE_16(temp)->size;
 321                 break;
 322         case U32_APER_SIZE:
 323                 current_size = A_SIZE_32(temp)->size;
 324                 break;
 325         case LVL2_APER_SIZE:
 326                 current_size = A_SIZE_LVL2(temp)->size;
 327                 break;
 328         case FIXED_APER_SIZE:
 329                 current_size = A_SIZE_FIX(temp)->size;
 330                 break;
 331         default:
 332                 current_size = 0;
 333                 break;
 334         }
 335
 336         current_size -= (agp_memory_reserved / (1024*1024));
 337         if (current_size <0)
 338                 current_size = 0;
 339         return current_size;
 340 }
 341
 342
 343 int agp_num_entries(void)
 344 {
 345         int num_entries;
 346         void *temp;
 347
 348         temp = agp_bridge->current_size;
 349
 350         switch (agp_bridge->driver->size_type) {
 351         case U8_APER_SIZE:
 352                 num_entries = A_SIZE_8(temp)->num_entries;
 353                 break;
 354         case U16_APER_SIZE:
 355                 num_entries = A_SIZE_16(temp)->num_entries;
 356                 break;
 357         case U32_APER_SIZE:
 358                 num_entries = A_SIZE_32(temp)->num_entries;
 359                 break;
 360         case LVL2_APER_SIZE:
 361                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 362                 break;
 363         case FIXED_APER_SIZE:
 364                 num_entries = A_SIZE_FIX(temp)->num_entries;
 365                 break;
 366         default:
 367                 num_entries = 0;
 368                 break;
 369         }
 370
 371         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 372         if (num_entries<0)
 373                 num_entries = 0;
 374         return num_entries;
 375 }
 376 EXPORT_SYMBOL_GPL(agp_num_entries);
 377
 378
 379 /**
 380  *      agp_copy_info  -  copy bridge state information
 381  *
 382  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 383  *
 384  *      This function copies information about the agp bridge device and the state of
 385  *      the agp backend into an agp_kern_info pointer.
 386  */
 387 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 388 {
 389         memset(info, 0, sizeof(struct agp_kern_info));
 390         if (!bridge) {
 391                 info->chipset = NOT_SUPPORTED;
 392                 return -EIO;
 393         }
 394
 395         info->version.major = bridge->version->major;
 396         info->version.minor = bridge->version->minor;
 397         info->chipset = SUPPORTED;
 398         info->device = bridge->dev;
 399         if (bridge->mode & AGPSTAT_MODE_3_0)
 400                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 401         else
 402                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 403         info->aper_base = bridge->gart_bus_addr;
 404         info->aper_size = agp_return_size();
 405         info->max_memory = bridge->max_memory_agp;
 406         info->current_memory = atomic_read(&bridge->current_memory_agp);
 407         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 408         info->vm_ops = bridge->vm_ops;
 409         info->page_mask = ~0UL;
 410         return 0;
 411 }
 412 EXPORT_SYMBOL(agp_copy_info);
 413
 414 /* End - Routine to copy over information structure */
 415
 416 /*
 417  * Routines for handling swapping of agp_memory into the GATT -
 418  * These routines take agp_memory and insert them into the GATT.
 419  * They call device specific routines to actually write to the GATT.
 420  */
 421
 422 /**
 423  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 424  *
 425  *      @curr:          agp_memory pointer
 426  *      @pg_start:      an offset into the graphics aperture translation table
 427  *
 428  *      It returns -EINVAL if the pointer == NULL.
 429  *      It returns -EBUSY if the area of the table requested is already in use.
 430  */
 431 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 432 {
 433         int ret_val;
 434
 435         if (curr == NULL)
 436                 return -EINVAL;
 437
 438         if (curr->is_bound) {
 439                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
 440                 return -EINVAL;
 441         }
 442         if (!curr->is_flushed) {
 443                 curr->bridge->driver->cache_flush();
 444                 curr->is_flushed = true;
 445         }
 446
 447         if (curr->bridge->driver->agp_map_memory) {
 448                 ret_val = curr->bridge->driver->agp_map_memory(curr);
 449                 if (ret_val)
 450                         return ret_val;
 451         }
 452         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 453
 454         if (ret_val != 0)
 455                 return ret_val;
 456
 457         curr->is_bound = true;
 458         curr->pg_start = pg_start;
 459         spin_lock(&agp_bridge->mapped_lock);
 460         list_add(&curr->mapped_list, &agp_bridge->mapped_list);
 461         spin_unlock(&agp_bridge->mapped_lock);
 462
 463         return 0;
 464 }
 465 EXPORT_SYMBOL(agp_bind_memory);
 466
 467
 468 /**
 469  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 470  *
 471  * @curr:       agp_memory pointer to be removed from the GATT.
 472  *
 473  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 474  * the graphics aperture translation table or if the agp_memory pointer == NULL
 475  */
 476 int agp_unbind_memory(struct agp_memory *curr)
 477 {
 478         int ret_val;
 479
 480         if (curr == NULL)
 481                 return -EINVAL;
 482
 483         if (!curr->is_bound) {
 484                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
 485                 return -EINVAL;
 486         }
 487
 488         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 489
 490         if (ret_val != 0)
 491                 return ret_val;
 492
 493         if (curr->bridge->driver->agp_unmap_memory)
 494                 curr->bridge->driver->agp_unmap_memory(curr);
 495
 496         curr->is_bound = false;
 497         curr->pg_start = 0;
 498         spin_lock(&curr->bridge->mapped_lock);
 499         list_del(&curr->mapped_list);
 500         spin_unlock(&curr->bridge->mapped_lock);
 501         return 0;
 502 }
 503 EXPORT_SYMBOL(agp_unbind_memory);
 504
 505 /**
 506  *      agp_rebind_emmory  -  Rewrite the entire GATT, useful on resume
 507  */
 508 int agp_rebind_memory(void)
 509 {
 510         struct agp_memory *curr;
 511         int ret_val = 0;
 512
 513         spin_lock(&agp_bridge->mapped_lock);
 514         list_for_each_entry(curr, &agp_bridge->mapped_list, mapped_list) {
 515                 ret_val = curr->bridge->driver->insert_memory(curr,
 516                                                               curr->pg_start,
 517                                                               curr->type);
 518                 if (ret_val != 0)
 519                         break;
 520         }
 521         spin_unlock(&agp_bridge->mapped_lock);
 522         return ret_val;
 523 }
 524 EXPORT_SYMBOL(agp_rebind_memory);
 525
 526 /* End - Routines for handling swapping of agp_memory into the GATT */
 527
 528
 529 /* Generic Agp routines - Start */
 530 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 531 {
 532         u32 tmp;
 533
 534         if (*requested_mode & AGP2_RESERVED_MASK) {
 535                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 536                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
 537                 *requested_mode &= ~AGP2_RESERVED_MASK;
 538         }
 539
 540         /*
 541          * Some dumb bridges are programmed to disobey the AGP2 spec.
 542          * This is likely a BIOS misprogramming rather than poweron default, or
 543          * it would be a lot more common.
 544          * https://bugs.freedesktop.org/show_bug.cgi?id=8816
 545          * AGPv2 spec 6.1.9 states:
 546          *   The RATE field indicates the data transfer rates supported by this
 547          *   device. A.G.P. devices must report all that apply.
 548          * Fix them up as best we can.
 549          */
 550         switch (*bridge_agpstat & 7) {
 551         case 4:
 552                 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
 553                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
 554                         "Fixing up support for x2 & x1\n");
 555                 break;
 556         case 2:
 557                 *bridge_agpstat |= AGPSTAT2_1X;
 558                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
 559                         "Fixing up support for x1\n");
 560                 break;
 561         default:
 562                 break;
 563         }
 564
 565         /* Check the speed bits make sense. Only one should be set. */
 566         tmp = *requested_mode & 7;
 567         switch (tmp) {
 568                 case 0:
 569                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 570                         *requested_mode |= AGPSTAT2_1X;
 571                         break;
 572                 case 1:
 573                 case 2:
 574                         break;
 575                 case 3:
 576                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 577                         break;
 578                 case 4:
 579                         break;
 580                 case 5:
 581                 case 6:
 582                 case 7:
 583                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 584                         break;
 585         }
 586
 587         /* disable SBA if it's not supported */
 588         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 589                 *bridge_agpstat &= ~AGPSTAT_SBA;
 590
 591         /* Set rate */
 592         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 593                 *bridge_agpstat &= ~AGPSTAT2_4X;
 594
 595         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 596                 *bridge_agpstat &= ~AGPSTAT2_2X;
 597
 598         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 599                 *bridge_agpstat &= ~AGPSTAT2_1X;
 600
 601         /* Now we know what mode it should be, clear out the unwanted bits. */
 602         if (*bridge_agpstat & AGPSTAT2_4X)
 603                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 604
 605         if (*bridge_agpstat & AGPSTAT2_2X)
 606                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 607
 608         if (*bridge_agpstat & AGPSTAT2_1X)
 609                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 610
 611         /* Apply any errata. */
 612         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 613                 *bridge_agpstat &= ~AGPSTAT_FW;
 614
 615         if (agp_bridge->flags & AGP_ERRATA_SBA)
 616                 *bridge_agpstat &= ~AGPSTAT_SBA;
 617
 618         if (agp_bridge->flags & AGP_ERRATA_1X) {
 619                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 620                 *bridge_agpstat |= AGPSTAT2_1X;
 621         }
 622
 623         /* If we've dropped down to 1X, disable fast writes. */
 624         if (*bridge_agpstat & AGPSTAT2_1X)
 625                 *bridge_agpstat &= ~AGPSTAT_FW;
 626 }
 627
 628 /*
 629  * requested_mode = Mode requested by (typically) X.
 630  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 631  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 632  */
 633 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 634 {
 635         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 636         u32 tmp;
 637
 638         if (*requested_mode & AGP3_RESERVED_MASK) {
 639                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 640                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
 641                 *requested_mode &= ~AGP3_RESERVED_MASK;
 642         }
 643
 644         /* Check the speed bits make sense. */
 645         tmp = *requested_mode & 7;
 646         if (tmp == 0) {
 647                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 648                 *requested_mode |= AGPSTAT3_4X;
 649         }
 650         if (tmp >= 3) {
 651                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 652                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 653         }
 654
 655         /* ARQSZ - Set the value to the maximum one.
 656          * Don't allow the mode register to override values. */
 657         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 658                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 659
 660         /* Calibration cycle.
 661          * Don't allow the mode register to override values. */
 662         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 663                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 664
 665         /* SBA *must* be supported for AGP v3 */
 666         *bridge_agpstat |= AGPSTAT_SBA;
 667
 668         /*
 669          * Set speed.
 670          * Check for invalid speeds. This can happen when applications
 671          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 672          */
 673         if (*requested_mode & AGPSTAT_MODE_3_0) {
 674                 /*
 675                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 676                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 677                  * AGP2.x 4x -> AGP3.0 4x.
 678                  */
 679                 if (*requested_mode & AGPSTAT2_4X) {
 680                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 681                                                 current->comm, *requested_mode);
 682                         *requested_mode &= ~AGPSTAT2_4X;
 683                         *requested_mode |= AGPSTAT3_4X;
 684                 }
 685         } else {
 686                 /*
 687                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 688                  * but have been passed an AGP 2.x mode.
 689                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 690                  */
 691                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 692                                         current->comm, *requested_mode);
 693                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 694                 *requested_mode |= AGPSTAT3_4X;
 695         }
 696
 697         if (*requested_mode & AGPSTAT3_8X) {
 698                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 699                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 700                         *bridge_agpstat |= AGPSTAT3_4X;
 701                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
 702                         return;
 703                 }
 704                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 705                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 706                         *bridge_agpstat |= AGPSTAT3_4X;
 707                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
 708                         return;
 709                 }
 710                 /* All set, bridge & device can do AGP x8*/
 711                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 712                 goto done;
 713
 714         } else if (*requested_mode & AGPSTAT3_4X) {
 715                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 716                 *bridge_agpstat |= AGPSTAT3_4X;
 717                 goto done;
 718
 719         } else {
 720
 721                 /*
 722                  * If we didn't specify an AGP mode, we see if both
 723                  * the graphics card, and the bridge can do x8, and use if so.
 724                  * If not, we fall back to x4 mode.
 725                  */
 726                 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
 727                         printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
 728                                 "supported by bridge & card (x8).\n");
 729                         *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 730                         *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 731                 } else {
 732                         printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
 733                         if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 734                                 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
 735                                         *bridge_agpstat, origbridge);
 736                                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 737                                 *bridge_agpstat |= AGPSTAT3_4X;
 738                         }
 739                         if (!(*vga_agpstat & AGPSTAT3_8X)) {
 740                                 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
 741                                         *vga_agpstat, origvga);
 742                                 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 743                                 *vga_agpstat |= AGPSTAT3_4X;
 744                         }
 745                 }
 746         }
 747
 748 done:
 749         /* Apply any errata. */
 750         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 751                 *bridge_agpstat &= ~AGPSTAT_FW;
 752
 753         if (agp_bridge->flags & AGP_ERRATA_SBA)
 754                 *bridge_agpstat &= ~AGPSTAT_SBA;
 755
 756         if (agp_bridge->flags & AGP_ERRATA_1X) {
 757                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 758                 *bridge_agpstat |= AGPSTAT2_1X;
 759         }
 760 }
 761
 762
 763 /**
 764  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 765  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 766  * @requested_mode: requested agp_stat from userspace (Typically from X)
 767  * @bridge_agpstat: current agp_stat from AGP bridge.
 768  *
 769  * This function will hunt for an AGP graphics card, and try to match
 770  * the requested mode to the capabilities of both the bridge and the card.
 771  */
 772 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 773 {
 774         struct pci_dev *device = NULL;
 775         u32 vga_agpstat;
 776         u8 cap_ptr;
 777
 778         for (;;) {
 779                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 780                 if (!device) {
 781                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 782                         return 0;
 783                 }
 784                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 785                 if (cap_ptr)
 786                         break;
 787         }
 788
 789         /*
 790          * Ok, here we have a AGP device. Disable impossible
 791          * settings, and adjust the readqueue to the minimum.
 792          */
 793         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 794
 795         /* adjust RQ depth */
 796         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 797              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 798                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 799
 800         /* disable FW if it's not supported */
 801         if (!((bridge_agpstat & AGPSTAT_FW) &&
 802                  (vga_agpstat & AGPSTAT_FW) &&
 803                  (requested_mode & AGPSTAT_FW)))
 804                 bridge_agpstat &= ~AGPSTAT_FW;
 805
 806         /* Check to see if we are operating in 3.0 mode */
 807         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 808                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 809         else
 810                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 811
 812         pci_dev_put(device);
 813         return bridge_agpstat;
 814 }
 815 EXPORT_SYMBOL(agp_collect_device_status);
 816
 817
 818 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
 819 {
 820         struct pci_dev *device = NULL;
 821         int mode;
 822
 823         mode = bridge_agpstat & 0x7;
 824         if (agp_v3)
 825                 mode *= 4;
 826
 827         for_each_pci_dev(device) {
 828                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 829                 if (!agp)
 830                         continue;
 831
 832                 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
 833                          agp_v3 ? 3 : 2, mode);
 834                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 835         }
 836 }
 837 EXPORT_SYMBOL(agp_device_command);
 838
 839
 840 void get_agp_version(struct agp_bridge_data *bridge)
 841 {
 842         u32 ncapid;
 843
 844         /* Exit early if already set by errata workarounds. */
 845         if (bridge->major_version != 0)
 846                 return;
 847
 848         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 849         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 850         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 851 }
 852 EXPORT_SYMBOL(get_agp_version);
 853
 854
 855 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 856 {
 857         u32 bridge_agpstat, temp;
 858
 859         get_agp_version(agp_bridge);
 860
 861         dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
 862                  agp_bridge->major_version, agp_bridge->minor_version);
 863
 864         pci_read_config_dword(agp_bridge->dev,
 865                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 866
 867         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 868         if (bridge_agpstat == 0)
 869                 /* Something bad happened. FIXME: Return error code? */
 870                 return;
 871
 872         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 873
 874         /* Do AGP version specific frobbing. */
 875         if (bridge->major_version >= 3) {
 876                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 877                         /* If we have 3.5, we can do the isoch stuff. */
 878                         if (bridge->minor_version >= 5)
 879                                 agp_3_5_enable(bridge);
 880                         agp_device_command(bridge_agpstat, true);
 881                         return;
 882                 } else {
 883                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 884                     bridge_agpstat &= ~(7<<10) ;
 885                     pci_read_config_dword(bridge->dev,
 886                                         bridge->capndx+AGPCTRL, &temp);
 887                     temp |= (1<<9);
 888                     pci_write_config_dword(bridge->dev,
 889                                         bridge->capndx+AGPCTRL, temp);
 890
 891                     dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
 892                 }
 893         }
 894
 895         /* AGP v<3 */
 896         agp_device_command(bridge_agpstat, false);
 897 }
 898 EXPORT_SYMBOL(agp_generic_enable);
 899
 900
 901 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 902 {
 903         char *table;
 904         char *table_end;
 905         int size;
 906         int page_order;
 907         int num_entries;
 908         int i;
 909         void *temp;
 910         struct page *page;
 911
 912         /* The generic routines can't handle 2 level gatt's */
 913         if (bridge->driver->size_type == LVL2_APER_SIZE)
 914                 return -EINVAL;
 915
 916         table = NULL;
 917         i = bridge->aperture_size_idx;
 918         temp = bridge->current_size;
 919         size = page_order = num_entries = 0;
 920
 921         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 922                 do {
 923                         switch (bridge->driver->size_type) {
 924                         case U8_APER_SIZE:
 925                                 size = A_SIZE_8(temp)->size;
 926                                 page_order =
 927                                     A_SIZE_8(temp)->page_order;
 928                                 num_entries =
 929                                     A_SIZE_8(temp)->num_entries;
 930                                 break;
 931                         case U16_APER_SIZE:
 932                                 size = A_SIZE_16(temp)->size;
 933                                 page_order = A_SIZE_16(temp)->page_order;
 934                                 num_entries = A_SIZE_16(temp)->num_entries;
 935                                 break;
 936                         case U32_APER_SIZE:
 937                                 size = A_SIZE_32(temp)->size;
 938                                 page_order = A_SIZE_32(temp)->page_order;
 939                                 num_entries = A_SIZE_32(temp)->num_entries;
 940                                 break;
 941                                 /* This case will never really happen. */
 942                         case FIXED_APER_SIZE:
 943                         case LVL2_APER_SIZE:
 944                         default:
 945                                 size = page_order = num_entries = 0;
 946                                 break;
 947                         }
 948
 949                         table = alloc_gatt_pages(page_order);
 950
 951                         if (table == NULL) {
 952                                 i++;
 953                                 switch (bridge->driver->size_type) {
 954                                 case U8_APER_SIZE:
 955                                         bridge->current_size = A_IDX8(bridge);
 956                                         break;
 957                                 case U16_APER_SIZE:
 958                                         bridge->current_size = A_IDX16(bridge);
 959                                         break;
 960                                 case U32_APER_SIZE:
 961                                         bridge->current_size = A_IDX32(bridge);
 962                                         break;
 963                                 /* These cases will never really happen. */
 964                                 case FIXED_APER_SIZE:
 965                                 case LVL2_APER_SIZE:
 966                                 default:
 967                                         break;
 968                                 }
 969                                 temp = bridge->current_size;
 970                         } else {
 971                                 bridge->aperture_size_idx = i;
 972                         }
 973                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 974         } else {
 975                 size = ((struct aper_size_info_fixed *) temp)->size;
 976                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 977                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 978                 table = alloc_gatt_pages(page_order);
 979         }
 980
 981         if (table == NULL)
 982                 return -ENOMEM;
 983
 984         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 985
 986         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 987                 SetPageReserved(page);
 988
 989         bridge->gatt_table_real = (u32 *) table;
 990         agp_gatt_table = (void *)table;
 991
 992         bridge->driver->cache_flush();
 993 #ifdef CONFIG_X86
 994         set_memory_uc((unsigned long)table, 1 << page_order);
 995         bridge->gatt_table = (void *)table;
 996 #else
 997         bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
 998                                         (PAGE_SIZE * (1 << page_order)));
 999         bridge->driver->cache_flush();
1000 #endif
1001
1002         if (bridge->gatt_table == NULL) {
1003                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1004                         ClearPageReserved(page);
1005
1006                 free_gatt_pages(table, page_order);
1007
1008                 return -ENOMEM;
1009         }
1010         bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
1011
1012         /* AK: bogus, should encode addresses > 4GB */
1013         for (i = 0; i < num_entries; i++) {
1014                 writel(bridge->scratch_page, bridge->gatt_table+i);
1015                 readl(bridge->gatt_table+i);    /* PCI Posting. */
1016         }
1017
1018         return 0;
1019 }
1020 EXPORT_SYMBOL(agp_generic_create_gatt_table);
1021
1022 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
1023 {
1024         int page_order;
1025         char *table, *table_end;
1026         void *temp;
1027         struct page *page;
1028
1029         temp = bridge->current_size;
1030
1031         switch (bridge->driver->size_type) {
1032         case U8_APER_SIZE:
1033                 page_order = A_SIZE_8(temp)->page_order;
1034                 break;
1035         case U16_APER_SIZE:
1036                 page_order = A_SIZE_16(temp)->page_order;
1037                 break;
1038         case U32_APER_SIZE:
1039                 page_order = A_SIZE_32(temp)->page_order;
1040                 break;
1041         case FIXED_APER_SIZE:
1042                 page_order = A_SIZE_FIX(temp)->page_order;
1043                 break;
1044         case LVL2_APER_SIZE:
1045                 /* The generic routines can't deal with 2 level gatt's */
1046                 return -EINVAL;
1047                 break;
1048         default:
1049                 page_order = 0;
1050                 break;
1051         }
1052
1053         /* Do not worry about freeing memory, because if this is
1054          * called, then all agp memory is deallocated and removed
1055          * from the table. */
1056
1057 #ifdef CONFIG_X86
1058         set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1059 #else
1060         iounmap(bridge->gatt_table);
1061 #endif
1062         table = (char *) bridge->gatt_table_real;
1063         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1064
1065         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1066                 ClearPageReserved(page);
1067
1068         free_gatt_pages(bridge->gatt_table_real, page_order);
1069
1070         agp_gatt_table = NULL;
1071         bridge->gatt_table = NULL;
1072         bridge->gatt_table_real = NULL;
1073         bridge->gatt_bus_addr = 0;
1074
1075         return 0;
1076 }
1077 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1078
1079
1080 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1081 {
1082         int num_entries;
1083         size_t i;
1084         off_t j;
1085         void *temp;
1086         struct agp_bridge_data *bridge;
1087         int mask_type;
1088
1089         bridge = mem->bridge;
1090         if (!bridge)
1091                 return -EINVAL;
1092
1093         if (mem->page_count == 0)
1094                 return 0;
1095
1096         temp = bridge->current_size;
1097
1098         switch (bridge->driver->size_type) {
1099         case U8_APER_SIZE:
1100                 num_entries = A_SIZE_8(temp)->num_entries;
1101                 break;
1102         case U16_APER_SIZE:
1103                 num_entries = A_SIZE_16(temp)->num_entries;
1104                 break;
1105         case U32_APER_SIZE:
1106                 num_entries = A_SIZE_32(temp)->num_entries;
1107                 break;
1108         case FIXED_APER_SIZE:
1109                 num_entries = A_SIZE_FIX(temp)->num_entries;
1110                 break;
1111         case LVL2_APER_SIZE:
1112                 /* The generic routines can't deal with 2 level gatt's */
1113                 return -EINVAL;
1114                 break;
1115         default:
1116                 num_entries = 0;
1117                 break;
1118         }
1119
1120         num_entries -= agp_memory_reserved/PAGE_SIZE;
1121         if (num_entries < 0) num_entries = 0;
1122
1123         if (type != mem->type)
1124                 return -EINVAL;
1125
1126         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1127         if (mask_type != 0) {
1128                 /* The generic routines know nothing of memory types */
1129                 return -EINVAL;
1130         }
1131
1132         if (((pg_start + mem->page_count) > num_entries) ||
1133             ((pg_start + mem->page_count) < pg_start))
1134                 return -EINVAL;
1135
1136         j = pg_start;
1137
1138         while (j < (pg_start + mem->page_count)) {
1139                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1140                         return -EBUSY;
1141                 j++;
1142         }
1143
1144         if (!mem->is_flushed) {
1145                 bridge->driver->cache_flush();
1146                 mem->is_flushed = true;
1147         }
1148
1149         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1150                 writel(bridge->driver->mask_memory(bridge,
1151                                                    page_to_phys(mem->pages[i]),
1152                                                    mask_type),
1153                        bridge->gatt_table+j);
1154         }
1155         readl(bridge->gatt_table+j-1);  /* PCI Posting. */
1156
1157         bridge->driver->tlb_flush(mem);
1158         return 0;
1159 }
1160 EXPORT_SYMBOL(agp_generic_insert_memory);
1161
1162
1163 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1164 {
1165         size_t i;
1166         struct agp_bridge_data *bridge;
1167         int mask_type, num_entries;
1168
1169         bridge = mem->bridge;
1170         if (!bridge)
1171                 return -EINVAL;
1172
1173         if (mem->page_count == 0)
1174                 return 0;
1175
1176         if (type != mem->type)
1177                 return -EINVAL;
1178
1179         num_entries = agp_num_entries();
1180         if (((pg_start + mem->page_count) > num_entries) ||
1181             ((pg_start + mem->page_count) < pg_start))
1182                 return -EINVAL;
1183
1184         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1185         if (mask_type != 0) {
1186                 /* The generic routines know nothing of memory types */
1187                 return -EINVAL;
1188         }
1189
1190         /* AK: bogus, should encode addresses > 4GB */
1191         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1192                 writel(bridge->scratch_page, bridge->gatt_table+i);
1193         }
1194         readl(bridge->gatt_table+i-1);  /* PCI Posting. */
1195
1196         bridge->driver->tlb_flush(mem);
1197         return 0;
1198 }
1199 EXPORT_SYMBOL(agp_generic_remove_memory);
1200
1201 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1202 {
1203         return NULL;
1204 }
1205 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1206
1207 void agp_generic_free_by_type(struct agp_memory *curr)
1208 {
1209         agp_free_page_array(curr);
1210         agp_free_key(curr->key);
1211         kfree(curr);
1212 }
1213 EXPORT_SYMBOL(agp_generic_free_by_type);
1214
1215 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1216 {
1217         struct agp_memory *new;
1218         int i;
1219         int pages;
1220
1221         pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1222         new = agp_create_user_memory(page_count);
1223         if (new == NULL)
1224                 return NULL;
1225
1226         for (i = 0; i < page_count; i++)
1227                 new->pages[i] = 0;
1228         new->page_count = 0;
1229         new->type = type;
1230         new->num_scratch_pages = pages;
1231
1232         return new;
1233 }
1234 EXPORT_SYMBOL(agp_generic_alloc_user);
1235
1236 /*
1237  * Basic Page Allocation Routines -
1238  * These routines handle page allocation and by default they reserve the allocated
1239  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1240  * against a maximum value.
1241  */
1242
1243 int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1244 {
1245         struct page * page;
1246         int i, ret = -ENOMEM;
1247
1248         for (i = 0; i < num_pages; i++) {
1249                 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1250                 /* agp_free_memory() needs gart address */
1251                 if (page == NULL)
1252                         goto out;
1253
1254 #ifndef CONFIG_X86
1255                 map_page_into_agp(page);
1256 #endif
1257                 get_page(page);
1258                 atomic_inc(&agp_bridge->current_memory_agp);
1259
1260                 mem->pages[i] = page;
1261                 mem->page_count++;
1262         }
1263
1264 #ifdef CONFIG_X86
1265         set_pages_array_uc(mem->pages, num_pages);
1266 #endif
1267         ret = 0;
1268 out:
1269         return ret;
1270 }
1271 EXPORT_SYMBOL(agp_generic_alloc_pages);
1272
1273 struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1274 {
1275         struct page * page;
1276
1277         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1278         if (page == NULL)
1279                 return NULL;
1280
1281         map_page_into_agp(page);
1282
1283         get_page(page);
1284         atomic_inc(&agp_bridge->current_memory_agp);
1285         return page;
1286 }
1287 EXPORT_SYMBOL(agp_generic_alloc_page);
1288
1289 void agp_generic_destroy_pages(struct agp_memory *mem)
1290 {
1291         int i;
1292         struct page *page;
1293
1294         if (!mem)
1295                 return;
1296
1297 #ifdef CONFIG_X86
1298         set_pages_array_wb(mem->pages, mem->page_count);
1299 #endif
1300
1301         for (i = 0; i < mem->page_count; i++) {
1302                 page = mem->pages[i];
1303
1304 #ifndef CONFIG_X86
1305                 unmap_page_from_agp(page);
1306 #endif
1307                 put_page(page);
1308                 __free_page(page);
1309                 atomic_dec(&agp_bridge->current_memory_agp);
1310                 mem->pages[i] = NULL;
1311         }
1312 }
1313 EXPORT_SYMBOL(agp_generic_destroy_pages);
1314
1315 void agp_generic_destroy_page(struct page *page, int flags)
1316 {
1317         if (page == NULL)
1318                 return;
1319
1320         if (flags & AGP_PAGE_DESTROY_UNMAP)
1321                 unmap_page_from_agp(page);
1322
1323         if (flags & AGP_PAGE_DESTROY_FREE) {
1324                 put_page(page);
1325                 __free_page(page);
1326                 atomic_dec(&agp_bridge->current_memory_agp);
1327         }
1328 }
1329 EXPORT_SYMBOL(agp_generic_destroy_page);
1330
1331 /* End Basic Page Allocation Routines */
1332
1333
1334 /**
1335  * agp_enable  -  initialise the agp point-to-point connection.
1336  *
1337  * @mode:       agp mode register value to configure with.
1338  */
1339 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1340 {
1341         if (!bridge)
1342                 return;
1343         bridge->driver->agp_enable(bridge, mode);
1344 }
1345 EXPORT_SYMBOL(agp_enable);
1346
1347 /* When we remove the global variable agp_bridge from all drivers
1348  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1349  */
1350
1351 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1352 {
1353         if (list_empty(&agp_bridges))
1354                 return NULL;
1355
1356         return agp_bridge;
1357 }
1358
1359 static void ipi_handler(void *null)
1360 {
1361         flush_agp_cache();
1362 }
1363
1364 void global_cache_flush(void)
1365 {
1366         if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1367                 panic(PFX "timed out waiting for the other CPUs!\n");
1368 }
1369 EXPORT_SYMBOL(global_cache_flush);
1370
1371 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1372                                       dma_addr_t addr, int type)
1373 {
1374         /* memory type is ignored in the generic routine */
1375         if (bridge->driver->masks)
1376                 return addr | bridge->driver->masks[0].mask;
1377         else
1378                 return addr;
1379 }
1380 EXPORT_SYMBOL(agp_generic_mask_memory);
1381
1382 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1383                                   int type)
1384 {
1385         if (type >= AGP_USER_TYPES)
1386                 return 0;
1387         return type;
1388 }
1389 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1390
1391 /*
1392  * These functions are implemented according to the AGPv3 spec,
1393  * which covers implementation details that had previously been
1394  * left open.
1395  */
1396
1397 int agp3_generic_fetch_size(void)
1398 {
1399         u16 temp_size;
1400         int i;
1401         struct aper_size_info_16 *values;
1402
1403         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1404         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1405
1406         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1407                 if (temp_size == values[i].size_value) {
1408                         agp_bridge->previous_size =
1409                                 agp_bridge->current_size = (void *) (values + i);
1410
1411                         agp_bridge->aperture_size_idx = i;
1412                         return values[i].size;
1413                 }
1414         }
1415         return 0;
1416 }
1417 EXPORT_SYMBOL(agp3_generic_fetch_size);
1418
1419 void agp3_generic_tlbflush(struct agp_memory *mem)
1420 {
1421         u32 ctrl;
1422         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1423         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1424         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1425 }
1426 EXPORT_SYMBOL(agp3_generic_tlbflush);
1427
1428 int agp3_generic_configure(void)
1429 {
1430         u32 temp;
1431         struct aper_size_info_16 *current_size;
1432
1433         current_size = A_SIZE_16(agp_bridge->current_size);
1434
1435         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1436         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1437
1438         /* set aperture size */
1439         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1440         /* set gart pointer */
1441         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1442         /* enable aperture and GTLB */
1443         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1444         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1445         return 0;
1446 }
1447 EXPORT_SYMBOL(agp3_generic_configure);
1448
1449 void agp3_generic_cleanup(void)
1450 {
1451         u32 ctrl;
1452         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1453         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1454 }
1455 EXPORT_SYMBOL(agp3_generic_cleanup);
1456
1457 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1458 {
1459         {4096, 1048576, 10,0x000},
1460         {2048,  524288, 9, 0x800},
1461         {1024,  262144, 8, 0xc00},
1462         { 512,  131072, 7, 0xe00},
1463         { 256,   65536, 6, 0xf00},
1464         { 128,   32768, 5, 0xf20},
1465         {  64,   16384, 4, 0xf30},
1466         {  32,    8192, 3, 0xf38},
1467         {  16,    4096, 2, 0xf3c},
1468         {   8,    2048, 1, 0xf3e},
1469         {   4,    1024, 0, 0xf3f}
1470 };
1471 EXPORT_SYMBOL(agp3_generic_sizes);
1472