drivers/char/agp/generic.c

   1 /*
   2  * AGPGART driver.
   3  * Copyright (C) 2004 Silicon Graphics, Inc.
   4  * Copyright (C) 2002-2005 Dave Jones.
   5  * Copyright (C) 1999 Jeff Hartmann.
   6  * Copyright (C) 1999 Precision Insight, Inc.
   7  * Copyright (C) 1999 Xi Graphics, Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
  25  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * TODO:
  28  * - Allocate more than order 0 pages to avoid too much linear map splitting.
  29  */
  30 #include <linux/module.h>
  31 #include <linux/pci.h>
  32 #include <linux/init.h>
  33 #include <linux/pagemap.h>
  34 #include <linux/miscdevice.h>
  35 #include <linux/pm.h>
  36 #include <linux/agp_backend.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/dma-mapping.h>
  39 #include <linux/mm.h>
  40 #include <linux/sched.h>
  41 #include <asm/io.h>
  42 #include <asm/cacheflush.h>
  43 #include <asm/pgtable.h>
  44 #include "agp.h"
  45
  46 __u32 *agp_gatt_table;
  47 int agp_memory_reserved;
  48
  49 /*
  50  * Needed by the Nforce GART driver for the time being. Would be
  51  * nice to do this some other way instead of needing this export.
  52  */
  53 EXPORT_SYMBOL_GPL(agp_memory_reserved);
  54
  55 /*
  56  * Generic routines for handling agp_memory structures -
  57  * They use the basic page allocation routines to do the brunt of the work.
  58  */
  59
  60 void agp_free_key(int key)
  61 {
  62         if (key < 0)
  63                 return;
  64
  65         if (key < MAXKEY)
  66                 clear_bit(key, agp_bridge->key_list);
  67 }
  68 EXPORT_SYMBOL(agp_free_key);
  69
  70
  71 static int agp_get_key(void)
  72 {
  73         int bit;
  74
  75         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  76         if (bit < MAXKEY) {
  77                 set_bit(bit, agp_bridge->key_list);
  78                 return bit;
  79         }
  80         return -1;
  81 }
  82
  83 void agp_flush_chipset(struct agp_bridge_data *bridge)
  84 {
  85         if (bridge->driver->chipset_flush)
  86                 bridge->driver->chipset_flush(bridge);
  87 }
  88 EXPORT_SYMBOL(agp_flush_chipset);
  89
  90 /*
  91  * Use kmalloc if possible for the page list. Otherwise fall back to
  92  * vmalloc. This speeds things up and also saves memory for small AGP
  93  * regions.
  94  */
  95
  96 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
  97 {
  98         mem->pages = NULL;
  99         mem->vmalloc_flag = false;
 100
 101         if (size <= 2*PAGE_SIZE)
 102                 mem->pages = kmalloc(size, GFP_KERNEL | __GFP_NORETRY);
 103         if (mem->pages == NULL) {
 104                 mem->pages = vmalloc(size);
 105                 mem->vmalloc_flag = true;
 106         }
 107 }
 108 EXPORT_SYMBOL(agp_alloc_page_array);
 109
 110 void agp_free_page_array(struct agp_memory *mem)
 111 {
 112         if (mem->vmalloc_flag) {
 113                 vfree(mem->pages);
 114         } else {
 115                 kfree(mem->pages);
 116         }
 117 }
 118 EXPORT_SYMBOL(agp_free_page_array);
 119
 120
 121 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
 122 {
 123         struct agp_memory *new;
 124         unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
 125
 126         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 127         if (new == NULL)
 128                 return NULL;
 129
 130         new->key = agp_get_key();
 131
 132         if (new->key < 0) {
 133                 kfree(new);
 134                 return NULL;
 135         }
 136
 137         agp_alloc_page_array(alloc_size, new);
 138
 139         if (new->pages == NULL) {
 140                 agp_free_key(new->key);
 141                 kfree(new);
 142                 return NULL;
 143         }
 144         new->num_scratch_pages = 0;
 145         return new;
 146 }
 147
 148 struct agp_memory *agp_create_memory(int scratch_pages)
 149 {
 150         struct agp_memory *new;
 151
 152         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 153         if (new == NULL)
 154                 return NULL;
 155
 156         new->key = agp_get_key();
 157
 158         if (new->key < 0) {
 159                 kfree(new);
 160                 return NULL;
 161         }
 162
 163         agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
 164
 165         if (new->pages == NULL) {
 166                 agp_free_key(new->key);
 167                 kfree(new);
 168                 return NULL;
 169         }
 170         new->num_scratch_pages = scratch_pages;
 171         new->type = AGP_NORMAL_MEMORY;
 172         return new;
 173 }
 174 EXPORT_SYMBOL(agp_create_memory);
 175
 176 /**
 177  *      agp_free_memory - free memory associated with an agp_memory pointer.
 178  *
 179  *      @curr:          agp_memory pointer to be freed.
 180  *
 181  *      It is the only function that can be called when the backend is not owned
 182  *      by the caller.  (So it can free memory on client death.)
 183  */
 184 void agp_free_memory(struct agp_memory *curr)
 185 {
 186         size_t i;
 187
 188         if (curr == NULL)
 189                 return;
 190
 191         if (curr->is_bound)
 192                 agp_unbind_memory(curr);
 193
 194         if (curr->type >= AGP_USER_TYPES) {
 195                 agp_generic_free_by_type(curr);
 196                 return;
 197         }
 198
 199         if (curr->type != 0) {
 200                 curr->bridge->driver->free_by_type(curr);
 201                 return;
 202         }
 203         if (curr->page_count != 0) {
 204                 if (curr->bridge->driver->agp_destroy_pages) {
 205                         curr->bridge->driver->agp_destroy_pages(curr);
 206                 } else {
 207
 208                         for (i = 0; i < curr->page_count; i++) {
 209                                 curr->bridge->driver->agp_destroy_page(
 210                                         curr->pages[i],
 211                                         AGP_PAGE_DESTROY_UNMAP);
 212                         }
 213                         for (i = 0; i < curr->page_count; i++) {
 214                                 curr->bridge->driver->agp_destroy_page(
 215                                         curr->pages[i],
 216                                         AGP_PAGE_DESTROY_FREE);
 217                         }
 218                 }
 219         }
 220         agp_free_key(curr->key);
 221         agp_free_page_array(curr);
 222         kfree(curr);
 223 }
 224 EXPORT_SYMBOL(agp_free_memory);
 225
 226 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 227
 228 /**
 229  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 230  *
 231  *      @page_count:    size_t argument of the number of pages
 232  *      @type:  u32 argument of the type of memory to be allocated.
 233  *
 234  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 235  *      maps to physical ram.  Any other type is device dependent.
 236  *
 237  *      It returns NULL whenever memory is unavailable.
 238  */
 239 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 240                                         size_t page_count, u32 type)
 241 {
 242         int scratch_pages;
 243         struct agp_memory *new;
 244         size_t i;
 245
 246         if (!bridge)
 247                 return NULL;
 248
 249         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
 250                 return NULL;
 251
 252         if (type >= AGP_USER_TYPES) {
 253                 new = agp_generic_alloc_user(page_count, type);
 254                 if (new)
 255                         new->bridge = bridge;
 256                 return new;
 257         }
 258
 259         if (type != 0) {
 260                 new = bridge->driver->alloc_by_type(page_count, type);
 261                 if (new)
 262                         new->bridge = bridge;
 263                 return new;
 264         }
 265
 266         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 267
 268         new = agp_create_memory(scratch_pages);
 269
 270         if (new == NULL)
 271                 return NULL;
 272
 273         if (bridge->driver->agp_alloc_pages) {
 274                 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
 275                         agp_free_memory(new);
 276                         return NULL;
 277                 }
 278                 new->bridge = bridge;
 279                 return new;
 280         }
 281
 282         for (i = 0; i < page_count; i++) {
 283                 struct page *page = bridge->driver->agp_alloc_page(bridge);
 284
 285                 if (page == NULL) {
 286                         agp_free_memory(new);
 287                         return NULL;
 288                 }
 289                 new->pages[i] = page;
 290                 new->page_count++;
 291         }
 292         new->bridge = bridge;
 293
 294         return new;
 295 }
 296 EXPORT_SYMBOL(agp_allocate_memory);
 297
 298
 299 /* End - Generic routines for handling agp_memory structures */
 300
 301
 302 static int agp_return_size(void)
 303 {
 304         int current_size;
 305         void *temp;
 306
 307         temp = agp_bridge->current_size;
 308
 309         switch (agp_bridge->driver->size_type) {
 310         case U8_APER_SIZE:
 311                 current_size = A_SIZE_8(temp)->size;
 312                 break;
 313         case U16_APER_SIZE:
 314                 current_size = A_SIZE_16(temp)->size;
 315                 break;
 316         case U32_APER_SIZE:
 317                 current_size = A_SIZE_32(temp)->size;
 318                 break;
 319         case LVL2_APER_SIZE:
 320                 current_size = A_SIZE_LVL2(temp)->size;
 321                 break;
 322         case FIXED_APER_SIZE:
 323                 current_size = A_SIZE_FIX(temp)->size;
 324                 break;
 325         default:
 326                 current_size = 0;
 327                 break;
 328         }
 329
 330         current_size -= (agp_memory_reserved / (1024*1024));
 331         if (current_size <0)
 332                 current_size = 0;
 333         return current_size;
 334 }
 335
 336
 337 int agp_num_entries(void)
 338 {
 339         int num_entries;
 340         void *temp;
 341
 342         temp = agp_bridge->current_size;
 343
 344         switch (agp_bridge->driver->size_type) {
 345         case U8_APER_SIZE:
 346                 num_entries = A_SIZE_8(temp)->num_entries;
 347                 break;
 348         case U16_APER_SIZE:
 349                 num_entries = A_SIZE_16(temp)->num_entries;
 350                 break;
 351         case U32_APER_SIZE:
 352                 num_entries = A_SIZE_32(temp)->num_entries;
 353                 break;
 354         case LVL2_APER_SIZE:
 355                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 356                 break;
 357         case FIXED_APER_SIZE:
 358                 num_entries = A_SIZE_FIX(temp)->num_entries;
 359                 break;
 360         default:
 361                 num_entries = 0;
 362                 break;
 363         }
 364
 365         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 366         if (num_entries<0)
 367                 num_entries = 0;
 368         return num_entries;
 369 }
 370 EXPORT_SYMBOL_GPL(agp_num_entries);
 371
 372
 373 /**
 374  *      agp_copy_info  -  copy bridge state information
 375  *
 376  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 377  *
 378  *      This function copies information about the agp bridge device and the state of
 379  *      the agp backend into an agp_kern_info pointer.
 380  */
 381 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 382 {
 383         memset(info, 0, sizeof(struct agp_kern_info));
 384         if (!bridge) {
 385                 info->chipset = NOT_SUPPORTED;
 386                 return -EIO;
 387         }
 388
 389         info->version.major = bridge->version->major;
 390         info->version.minor = bridge->version->minor;
 391         info->chipset = SUPPORTED;
 392         info->device = bridge->dev;
 393         if (bridge->mode & AGPSTAT_MODE_3_0)
 394                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 395         else
 396                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 397         info->aper_base = bridge->gart_bus_addr;
 398         info->aper_size = agp_return_size();
 399         info->max_memory = bridge->max_memory_agp;
 400         info->current_memory = atomic_read(&bridge->current_memory_agp);
 401         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 402         info->vm_ops = bridge->vm_ops;
 403         info->page_mask = ~0UL;
 404         return 0;
 405 }
 406 EXPORT_SYMBOL(agp_copy_info);
 407
 408 /* End - Routine to copy over information structure */
 409
 410 /*
 411  * Routines for handling swapping of agp_memory into the GATT -
 412  * These routines take agp_memory and insert them into the GATT.
 413  * They call device specific routines to actually write to the GATT.
 414  */
 415
 416 /**
 417  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 418  *
 419  *      @curr:          agp_memory pointer
 420  *      @pg_start:      an offset into the graphics aperture translation table
 421  *
 422  *      It returns -EINVAL if the pointer == NULL.
 423  *      It returns -EBUSY if the area of the table requested is already in use.
 424  */
 425 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 426 {
 427         int ret_val;
 428
 429         if (curr == NULL)
 430                 return -EINVAL;
 431
 432         if (curr->is_bound) {
 433                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
 434                 return -EINVAL;
 435         }
 436         if (!curr->is_flushed) {
 437                 curr->bridge->driver->cache_flush();
 438                 curr->is_flushed = true;
 439         }
 440
 441         if (curr->bridge->driver->agp_map_memory) {
 442                 ret_val = curr->bridge->driver->agp_map_memory(curr);
 443                 if (ret_val)
 444                         return ret_val;
 445         }
 446         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 447
 448         if (ret_val != 0)
 449                 return ret_val;
 450
 451         curr->is_bound = true;
 452         curr->pg_start = pg_start;
 453         spin_lock(&agp_bridge->mapped_lock);
 454         list_add(&curr->mapped_list, &agp_bridge->mapped_list);
 455         spin_unlock(&agp_bridge->mapped_lock);
 456
 457         return 0;
 458 }
 459 EXPORT_SYMBOL(agp_bind_memory);
 460
 461
 462 /**
 463  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 464  *
 465  * @curr:       agp_memory pointer to be removed from the GATT.
 466  *
 467  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 468  * the graphics aperture translation table or if the agp_memory pointer == NULL
 469  */
 470 int agp_unbind_memory(struct agp_memory *curr)
 471 {
 472         int ret_val;
 473
 474         if (curr == NULL)
 475                 return -EINVAL;
 476
 477         if (!curr->is_bound) {
 478                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
 479                 return -EINVAL;
 480         }
 481
 482         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 483
 484         if (ret_val != 0)
 485                 return ret_val;
 486
 487         if (curr->bridge->driver->agp_unmap_memory)
 488                 curr->bridge->driver->agp_unmap_memory(curr);
 489
 490         curr->is_bound = false;
 491         curr->pg_start = 0;
 492         spin_lock(&curr->bridge->mapped_lock);
 493         list_del(&curr->mapped_list);
 494         spin_unlock(&curr->bridge->mapped_lock);
 495         return 0;
 496 }
 497 EXPORT_SYMBOL(agp_unbind_memory);
 498
 499 /**
 500  *      agp_rebind_emmory  -  Rewrite the entire GATT, useful on resume
 501  */
 502 int agp_rebind_memory(void)
 503 {
 504         struct agp_memory *curr;
 505         int ret_val = 0;
 506
 507         spin_lock(&agp_bridge->mapped_lock);
 508         list_for_each_entry(curr, &agp_bridge->mapped_list, mapped_list) {
 509                 ret_val = curr->bridge->driver->insert_memory(curr,
 510                                                               curr->pg_start,
 511                                                               curr->type);
 512                 if (ret_val != 0)
 513                         break;
 514         }
 515         spin_unlock(&agp_bridge->mapped_lock);
 516         return ret_val;
 517 }
 518 EXPORT_SYMBOL(agp_rebind_memory);
 519
 520 /* End - Routines for handling swapping of agp_memory into the GATT */
 521
 522
 523 /* Generic Agp routines - Start */
 524 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 525 {
 526         u32 tmp;
 527
 528         if (*requested_mode & AGP2_RESERVED_MASK) {
 529                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 530                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
 531                 *requested_mode &= ~AGP2_RESERVED_MASK;
 532         }
 533
 534         /*
 535          * Some dumb bridges are programmed to disobey the AGP2 spec.
 536          * This is likely a BIOS misprogramming rather than poweron default, or
 537          * it would be a lot more common.
 538          * https://bugs.freedesktop.org/show_bug.cgi?id=8816
 539          * AGPv2 spec 6.1.9 states:
 540          *   The RATE field indicates the data transfer rates supported by this
 541          *   device. A.G.P. devices must report all that apply.
 542          * Fix them up as best we can.
 543          */
 544         switch (*bridge_agpstat & 7) {
 545         case 4:
 546                 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
 547                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
 548                         "Fixing up support for x2 & x1\n");
 549                 break;
 550         case 2:
 551                 *bridge_agpstat |= AGPSTAT2_1X;
 552                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
 553                         "Fixing up support for x1\n");
 554                 break;
 555         default:
 556                 break;
 557         }
 558
 559         /* Check the speed bits make sense. Only one should be set. */
 560         tmp = *requested_mode & 7;
 561         switch (tmp) {
 562                 case 0:
 563                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 564                         *requested_mode |= AGPSTAT2_1X;
 565                         break;
 566                 case 1:
 567                 case 2:
 568                         break;
 569                 case 3:
 570                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 571                         break;
 572                 case 4:
 573                         break;
 574                 case 5:
 575                 case 6:
 576                 case 7:
 577                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 578                         break;
 579         }
 580
 581         /* disable SBA if it's not supported */
 582         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 583                 *bridge_agpstat &= ~AGPSTAT_SBA;
 584
 585         /* Set rate */
 586         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 587                 *bridge_agpstat &= ~AGPSTAT2_4X;
 588
 589         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 590                 *bridge_agpstat &= ~AGPSTAT2_2X;
 591
 592         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 593                 *bridge_agpstat &= ~AGPSTAT2_1X;
 594
 595         /* Now we know what mode it should be, clear out the unwanted bits. */
 596         if (*bridge_agpstat & AGPSTAT2_4X)
 597                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 598
 599         if (*bridge_agpstat & AGPSTAT2_2X)
 600                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 601
 602         if (*bridge_agpstat & AGPSTAT2_1X)
 603                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 604
 605         /* Apply any errata. */
 606         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 607                 *bridge_agpstat &= ~AGPSTAT_FW;
 608
 609         if (agp_bridge->flags & AGP_ERRATA_SBA)
 610                 *bridge_agpstat &= ~AGPSTAT_SBA;
 611
 612         if (agp_bridge->flags & AGP_ERRATA_1X) {
 613                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 614                 *bridge_agpstat |= AGPSTAT2_1X;
 615         }
 616
 617         /* If we've dropped down to 1X, disable fast writes. */
 618         if (*bridge_agpstat & AGPSTAT2_1X)
 619                 *bridge_agpstat &= ~AGPSTAT_FW;
 620 }
 621
 622 /*
 623  * requested_mode = Mode requested by (typically) X.
 624  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 625  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 626  */
 627 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 628 {
 629         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 630         u32 tmp;
 631
 632         if (*requested_mode & AGP3_RESERVED_MASK) {
 633                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 634                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
 635                 *requested_mode &= ~AGP3_RESERVED_MASK;
 636         }
 637
 638         /* Check the speed bits make sense. */
 639         tmp = *requested_mode & 7;
 640         if (tmp == 0) {
 641                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 642                 *requested_mode |= AGPSTAT3_4X;
 643         }
 644         if (tmp >= 3) {
 645                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 646                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 647         }
 648
 649         /* ARQSZ - Set the value to the maximum one.
 650          * Don't allow the mode register to override values. */
 651         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 652                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 653
 654         /* Calibration cycle.
 655          * Don't allow the mode register to override values. */
 656         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 657                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 658
 659         /* SBA *must* be supported for AGP v3 */
 660         *bridge_agpstat |= AGPSTAT_SBA;
 661
 662         /*
 663          * Set speed.
 664          * Check for invalid speeds. This can happen when applications
 665          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 666          */
 667         if (*requested_mode & AGPSTAT_MODE_3_0) {
 668                 /*
 669                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 670                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 671                  * AGP2.x 4x -> AGP3.0 4x.
 672                  */
 673                 if (*requested_mode & AGPSTAT2_4X) {
 674                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 675                                                 current->comm, *requested_mode);
 676                         *requested_mode &= ~AGPSTAT2_4X;
 677                         *requested_mode |= AGPSTAT3_4X;
 678                 }
 679         } else {
 680                 /*
 681                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 682                  * but have been passed an AGP 2.x mode.
 683                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 684                  */
 685                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 686                                         current->comm, *requested_mode);
 687                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 688                 *requested_mode |= AGPSTAT3_4X;
 689         }
 690
 691         if (*requested_mode & AGPSTAT3_8X) {
 692                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 693                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 694                         *bridge_agpstat |= AGPSTAT3_4X;
 695                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
 696                         return;
 697                 }
 698                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 699                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 700                         *bridge_agpstat |= AGPSTAT3_4X;
 701                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
 702                         return;
 703                 }
 704                 /* All set, bridge & device can do AGP x8*/
 705                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 706                 goto done;
 707
 708         } else if (*requested_mode & AGPSTAT3_4X) {
 709                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 710                 *bridge_agpstat |= AGPSTAT3_4X;
 711                 goto done;
 712
 713         } else {
 714
 715                 /*
 716                  * If we didn't specify an AGP mode, we see if both
 717                  * the graphics card, and the bridge can do x8, and use if so.
 718                  * If not, we fall back to x4 mode.
 719                  */
 720                 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
 721                         printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
 722                                 "supported by bridge & card (x8).\n");
 723                         *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 724                         *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 725                 } else {
 726                         printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
 727                         if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 728                                 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
 729                                         *bridge_agpstat, origbridge);
 730                                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 731                                 *bridge_agpstat |= AGPSTAT3_4X;
 732                         }
 733                         if (!(*vga_agpstat & AGPSTAT3_8X)) {
 734                                 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
 735                                         *vga_agpstat, origvga);
 736                                 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 737                                 *vga_agpstat |= AGPSTAT3_4X;
 738                         }
 739                 }
 740         }
 741
 742 done:
 743         /* Apply any errata. */
 744         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 745                 *bridge_agpstat &= ~AGPSTAT_FW;
 746
 747         if (agp_bridge->flags & AGP_ERRATA_SBA)
 748                 *bridge_agpstat &= ~AGPSTAT_SBA;
 749
 750         if (agp_bridge->flags & AGP_ERRATA_1X) {
 751                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 752                 *bridge_agpstat |= AGPSTAT2_1X;
 753         }
 754 }
 755
 756
 757 /**
 758  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 759  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 760  * @requested_mode: requested agp_stat from userspace (Typically from X)
 761  * @bridge_agpstat: current agp_stat from AGP bridge.
 762  *
 763  * This function will hunt for an AGP graphics card, and try to match
 764  * the requested mode to the capabilities of both the bridge and the card.
 765  */
 766 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 767 {
 768         struct pci_dev *device = NULL;
 769         u32 vga_agpstat;
 770         u8 cap_ptr;
 771
 772         for (;;) {
 773                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 774                 if (!device) {
 775                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 776                         return 0;
 777                 }
 778                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 779                 if (cap_ptr)
 780                         break;
 781         }
 782
 783         /*
 784          * Ok, here we have a AGP device. Disable impossible
 785          * settings, and adjust the readqueue to the minimum.
 786          */
 787         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 788
 789         /* adjust RQ depth */
 790         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 791              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 792                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 793
 794         /* disable FW if it's not supported */
 795         if (!((bridge_agpstat & AGPSTAT_FW) &&
 796                  (vga_agpstat & AGPSTAT_FW) &&
 797                  (requested_mode & AGPSTAT_FW)))
 798                 bridge_agpstat &= ~AGPSTAT_FW;
 799
 800         /* Check to see if we are operating in 3.0 mode */
 801         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 802                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 803         else
 804                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 805
 806         pci_dev_put(device);
 807         return bridge_agpstat;
 808 }
 809 EXPORT_SYMBOL(agp_collect_device_status);
 810
 811
 812 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
 813 {
 814         struct pci_dev *device = NULL;
 815         int mode;
 816
 817         mode = bridge_agpstat & 0x7;
 818         if (agp_v3)
 819                 mode *= 4;
 820
 821         for_each_pci_dev(device) {
 822                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 823                 if (!agp)
 824                         continue;
 825
 826                 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
 827                          agp_v3 ? 3 : 2, mode);
 828                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 829         }
 830 }
 831 EXPORT_SYMBOL(agp_device_command);
 832
 833
 834 void get_agp_version(struct agp_bridge_data *bridge)
 835 {
 836         u32 ncapid;
 837
 838         /* Exit early if already set by errata workarounds. */
 839         if (bridge->major_version != 0)
 840                 return;
 841
 842         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 843         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 844         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 845 }
 846 EXPORT_SYMBOL(get_agp_version);
 847
 848
 849 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 850 {
 851         u32 bridge_agpstat, temp;
 852
 853         get_agp_version(agp_bridge);
 854
 855         dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
 856                  agp_bridge->major_version, agp_bridge->minor_version);
 857
 858         pci_read_config_dword(agp_bridge->dev,
 859                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 860
 861         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 862         if (bridge_agpstat == 0)
 863                 /* Something bad happened. FIXME: Return error code? */
 864                 return;
 865
 866         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 867
 868         /* Do AGP version specific frobbing. */
 869         if (bridge->major_version >= 3) {
 870                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 871                         /* If we have 3.5, we can do the isoch stuff. */
 872                         if (bridge->minor_version >= 5)
 873                                 agp_3_5_enable(bridge);
 874                         agp_device_command(bridge_agpstat, true);
 875                         return;
 876                 } else {
 877                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 878                     bridge_agpstat &= ~(7<<10) ;
 879                     pci_read_config_dword(bridge->dev,
 880                                         bridge->capndx+AGPCTRL, &temp);
 881                     temp |= (1<<9);
 882                     pci_write_config_dword(bridge->dev,
 883                                         bridge->capndx+AGPCTRL, temp);
 884
 885                     dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
 886                 }
 887         }
 888
 889         /* AGP v<3 */
 890         agp_device_command(bridge_agpstat, false);
 891 }
 892 EXPORT_SYMBOL(agp_generic_enable);
 893
 894
 895 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 896 {
 897         char *table;
 898         char *table_end;
 899         int size;
 900         int page_order;
 901         int num_entries;
 902         int i;
 903         void *temp;
 904         struct page *page;
 905
 906         /* The generic routines can't handle 2 level gatt's */
 907         if (bridge->driver->size_type == LVL2_APER_SIZE)
 908                 return -EINVAL;
 909
 910         table = NULL;
 911         i = bridge->aperture_size_idx;
 912         temp = bridge->current_size;
 913         size = page_order = num_entries = 0;
 914
 915         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 916                 do {
 917                         switch (bridge->driver->size_type) {
 918                         case U8_APER_SIZE:
 919                                 size = A_SIZE_8(temp)->size;
 920                                 page_order =
 921                                     A_SIZE_8(temp)->page_order;
 922                                 num_entries =
 923                                     A_SIZE_8(temp)->num_entries;
 924                                 break;
 925                         case U16_APER_SIZE:
 926                                 size = A_SIZE_16(temp)->size;
 927                                 page_order = A_SIZE_16(temp)->page_order;
 928                                 num_entries = A_SIZE_16(temp)->num_entries;
 929                                 break;
 930                         case U32_APER_SIZE:
 931                                 size = A_SIZE_32(temp)->size;
 932                                 page_order = A_SIZE_32(temp)->page_order;
 933                                 num_entries = A_SIZE_32(temp)->num_entries;
 934                                 break;
 935                                 /* This case will never really happen. */
 936                         case FIXED_APER_SIZE:
 937                         case LVL2_APER_SIZE:
 938                         default:
 939                                 size = page_order = num_entries = 0;
 940                                 break;
 941                         }
 942
 943                         table = alloc_gatt_pages(page_order);
 944
 945                         if (table == NULL) {
 946                                 i++;
 947                                 switch (bridge->driver->size_type) {
 948                                 case U8_APER_SIZE:
 949                                         bridge->current_size = A_IDX8(bridge);
 950                                         break;
 951                                 case U16_APER_SIZE:
 952                                         bridge->current_size = A_IDX16(bridge);
 953                                         break;
 954                                 case U32_APER_SIZE:
 955                                         bridge->current_size = A_IDX32(bridge);
 956                                         break;
 957                                 /* These cases will never really happen. */
 958                                 case FIXED_APER_SIZE:
 959                                 case LVL2_APER_SIZE:
 960                                 default:
 961                                         break;
 962                                 }
 963                                 temp = bridge->current_size;
 964                         } else {
 965                                 bridge->aperture_size_idx = i;
 966                         }
 967                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 968         } else {
 969                 size = ((struct aper_size_info_fixed *) temp)->size;
 970                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 971                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 972                 table = alloc_gatt_pages(page_order);
 973         }
 974
 975         if (table == NULL)
 976                 return -ENOMEM;
 977
 978         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 979
 980         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 981                 SetPageReserved(page);
 982
 983         bridge->gatt_table_real = (u32 *) table;
 984         agp_gatt_table = (void *)table;
 985
 986         bridge->driver->cache_flush();
 987 #ifdef CONFIG_X86
 988         set_memory_uc((unsigned long)table, 1 << page_order);
 989         bridge->gatt_table = (void *)table;
 990 #else
 991         bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
 992                                         (PAGE_SIZE * (1 << page_order)));
 993         bridge->driver->cache_flush();
 994 #endif
 995
 996         if (bridge->gatt_table == NULL) {
 997                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 998                         ClearPageReserved(page);
 999
1000                 free_gatt_pages(table, page_order);
1001
1002                 return -ENOMEM;
1003         }
1004         bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
1005
1006         /* AK: bogus, should encode addresses > 4GB */
1007         for (i = 0; i < num_entries; i++) {
1008                 writel(bridge->scratch_page, bridge->gatt_table+i);
1009                 readl(bridge->gatt_table+i);    /* PCI Posting. */
1010         }
1011
1012         return 0;
1013 }
1014 EXPORT_SYMBOL(agp_generic_create_gatt_table);
1015
1016 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
1017 {
1018         int page_order;
1019         char *table, *table_end;
1020         void *temp;
1021         struct page *page;
1022
1023         temp = bridge->current_size;
1024
1025         switch (bridge->driver->size_type) {
1026         case U8_APER_SIZE:
1027                 page_order = A_SIZE_8(temp)->page_order;
1028                 break;
1029         case U16_APER_SIZE:
1030                 page_order = A_SIZE_16(temp)->page_order;
1031                 break;
1032         case U32_APER_SIZE:
1033                 page_order = A_SIZE_32(temp)->page_order;
1034                 break;
1035         case FIXED_APER_SIZE:
1036                 page_order = A_SIZE_FIX(temp)->page_order;
1037                 break;
1038         case LVL2_APER_SIZE:
1039                 /* The generic routines can't deal with 2 level gatt's */
1040                 return -EINVAL;
1041                 break;
1042         default:
1043                 page_order = 0;
1044                 break;
1045         }
1046
1047         /* Do not worry about freeing memory, because if this is
1048          * called, then all agp memory is deallocated and removed
1049          * from the table. */
1050
1051 #ifdef CONFIG_X86
1052         set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1053 #else
1054         iounmap(bridge->gatt_table);
1055 #endif
1056         table = (char *) bridge->gatt_table_real;
1057         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1058
1059         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1060                 ClearPageReserved(page);
1061
1062         free_gatt_pages(bridge->gatt_table_real, page_order);
1063
1064         agp_gatt_table = NULL;
1065         bridge->gatt_table = NULL;
1066         bridge->gatt_table_real = NULL;
1067         bridge->gatt_bus_addr = 0;
1068
1069         return 0;
1070 }
1071 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1072
1073
1074 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1075 {
1076         int num_entries;
1077         size_t i;
1078         off_t j;
1079         void *temp;
1080         struct agp_bridge_data *bridge;
1081         int mask_type;
1082
1083         bridge = mem->bridge;
1084         if (!bridge)
1085                 return -EINVAL;
1086
1087         if (mem->page_count == 0)
1088                 return 0;
1089
1090         temp = bridge->current_size;
1091
1092         switch (bridge->driver->size_type) {
1093         case U8_APER_SIZE:
1094                 num_entries = A_SIZE_8(temp)->num_entries;
1095                 break;
1096         case U16_APER_SIZE:
1097                 num_entries = A_SIZE_16(temp)->num_entries;
1098                 break;
1099         case U32_APER_SIZE:
1100                 num_entries = A_SIZE_32(temp)->num_entries;
1101                 break;
1102         case FIXED_APER_SIZE:
1103                 num_entries = A_SIZE_FIX(temp)->num_entries;
1104                 break;
1105         case LVL2_APER_SIZE:
1106                 /* The generic routines can't deal with 2 level gatt's */
1107                 return -EINVAL;
1108                 break;
1109         default:
1110                 num_entries = 0;
1111                 break;
1112         }
1113
1114         num_entries -= agp_memory_reserved/PAGE_SIZE;
1115         if (num_entries < 0) num_entries = 0;
1116
1117         if (type != mem->type)
1118                 return -EINVAL;
1119
1120         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1121         if (mask_type != 0) {
1122                 /* The generic routines know nothing of memory types */
1123                 return -EINVAL;
1124         }
1125
1126         /* AK: could wrap */
1127         if ((pg_start + mem->page_count) > num_entries)
1128                 return -EINVAL;
1129
1130         j = pg_start;
1131
1132         while (j < (pg_start + mem->page_count)) {
1133                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1134                         return -EBUSY;
1135                 j++;
1136         }
1137
1138         if (!mem->is_flushed) {
1139                 bridge->driver->cache_flush();
1140                 mem->is_flushed = true;
1141         }
1142
1143         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1144                 writel(bridge->driver->mask_memory(bridge,
1145                                                    page_to_phys(mem->pages[i]),
1146                                                    mask_type),
1147                        bridge->gatt_table+j);
1148         }
1149         readl(bridge->gatt_table+j-1);  /* PCI Posting. */
1150
1151         bridge->driver->tlb_flush(mem);
1152         return 0;
1153 }
1154 EXPORT_SYMBOL(agp_generic_insert_memory);
1155
1156
1157 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1158 {
1159         size_t i;
1160         struct agp_bridge_data *bridge;
1161         int mask_type;
1162
1163         bridge = mem->bridge;
1164         if (!bridge)
1165                 return -EINVAL;
1166
1167         if (mem->page_count == 0)
1168                 return 0;
1169
1170         if (type != mem->type)
1171                 return -EINVAL;
1172
1173         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1174         if (mask_type != 0) {
1175                 /* The generic routines know nothing of memory types */
1176                 return -EINVAL;
1177         }
1178
1179         /* AK: bogus, should encode addresses > 4GB */
1180         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1181                 writel(bridge->scratch_page, bridge->gatt_table+i);
1182         }
1183         readl(bridge->gatt_table+i-1);  /* PCI Posting. */
1184
1185         bridge->driver->tlb_flush(mem);
1186         return 0;
1187 }
1188 EXPORT_SYMBOL(agp_generic_remove_memory);
1189
1190 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1191 {
1192         return NULL;
1193 }
1194 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1195
1196 void agp_generic_free_by_type(struct agp_memory *curr)
1197 {
1198         agp_free_page_array(curr);
1199         agp_free_key(curr->key);
1200         kfree(curr);
1201 }
1202 EXPORT_SYMBOL(agp_generic_free_by_type);
1203
1204 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1205 {
1206         struct agp_memory *new;
1207         int i;
1208         int pages;
1209
1210         pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1211         new = agp_create_user_memory(page_count);
1212         if (new == NULL)
1213                 return NULL;
1214
1215         for (i = 0; i < page_count; i++)
1216                 new->pages[i] = 0;
1217         new->page_count = 0;
1218         new->type = type;
1219         new->num_scratch_pages = pages;
1220
1221         return new;
1222 }
1223 EXPORT_SYMBOL(agp_generic_alloc_user);
1224
1225 /*
1226  * Basic Page Allocation Routines -
1227  * These routines handle page allocation and by default they reserve the allocated
1228  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1229  * against a maximum value.
1230  */
1231
1232 int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1233 {
1234         struct page * page;
1235         int i, ret = -ENOMEM;
1236
1237         for (i = 0; i < num_pages; i++) {
1238                 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1239                 /* agp_free_memory() needs gart address */
1240                 if (page == NULL)
1241                         goto out;
1242
1243 #ifndef CONFIG_X86
1244                 map_page_into_agp(page);
1245 #endif
1246                 get_page(page);
1247                 atomic_inc(&agp_bridge->current_memory_agp);
1248
1249                 mem->pages[i] = page;
1250                 mem->page_count++;
1251         }
1252
1253 #ifdef CONFIG_X86
1254         set_pages_array_uc(mem->pages, num_pages);
1255 #endif
1256         ret = 0;
1257 out:
1258         return ret;
1259 }
1260 EXPORT_SYMBOL(agp_generic_alloc_pages);
1261
1262 struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1263 {
1264         struct page * page;
1265
1266         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1267         if (page == NULL)
1268                 return NULL;
1269
1270         map_page_into_agp(page);
1271
1272         get_page(page);
1273         atomic_inc(&agp_bridge->current_memory_agp);
1274         return page;
1275 }
1276 EXPORT_SYMBOL(agp_generic_alloc_page);
1277
1278 void agp_generic_destroy_pages(struct agp_memory *mem)
1279 {
1280         int i;
1281         struct page *page;
1282
1283         if (!mem)
1284                 return;
1285
1286 #ifdef CONFIG_X86
1287         set_pages_array_wb(mem->pages, mem->page_count);
1288 #endif
1289
1290         for (i = 0; i < mem->page_count; i++) {
1291                 page = mem->pages[i];
1292
1293 #ifndef CONFIG_X86
1294                 unmap_page_from_agp(page);
1295 #endif
1296                 put_page(page);
1297                 __free_page(page);
1298                 atomic_dec(&agp_bridge->current_memory_agp);
1299                 mem->pages[i] = NULL;
1300         }
1301 }
1302 EXPORT_SYMBOL(agp_generic_destroy_pages);
1303
1304 void agp_generic_destroy_page(struct page *page, int flags)
1305 {
1306         if (page == NULL)
1307                 return;
1308
1309         if (flags & AGP_PAGE_DESTROY_UNMAP)
1310                 unmap_page_from_agp(page);
1311
1312         if (flags & AGP_PAGE_DESTROY_FREE) {
1313                 put_page(page);
1314                 __free_page(page);
1315                 atomic_dec(&agp_bridge->current_memory_agp);
1316         }
1317 }
1318 EXPORT_SYMBOL(agp_generic_destroy_page);
1319
1320 /* End Basic Page Allocation Routines */
1321
1322
1323 /**
1324  * agp_enable  -  initialise the agp point-to-point connection.
1325  *
1326  * @mode:       agp mode register value to configure with.
1327  */
1328 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1329 {
1330         if (!bridge)
1331                 return;
1332         bridge->driver->agp_enable(bridge, mode);
1333 }
1334 EXPORT_SYMBOL(agp_enable);
1335
1336 /* When we remove the global variable agp_bridge from all drivers
1337  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1338  */
1339
1340 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1341 {
1342         if (list_empty(&agp_bridges))
1343                 return NULL;
1344
1345         return agp_bridge;
1346 }
1347
1348 static void ipi_handler(void *null)
1349 {
1350         flush_agp_cache();
1351 }
1352
1353 void global_cache_flush(void)
1354 {
1355         if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1356                 panic(PFX "timed out waiting for the other CPUs!\n");
1357 }
1358 EXPORT_SYMBOL(global_cache_flush);
1359
1360 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1361                                       dma_addr_t addr, int type)
1362 {
1363         /* memory type is ignored in the generic routine */
1364         if (bridge->driver->masks)
1365                 return addr | bridge->driver->masks[0].mask;
1366         else
1367                 return addr;
1368 }
1369 EXPORT_SYMBOL(agp_generic_mask_memory);
1370
1371 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1372                                   int type)
1373 {
1374         if (type >= AGP_USER_TYPES)
1375                 return 0;
1376         return type;
1377 }
1378 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1379
1380 /*
1381  * These functions are implemented according to the AGPv3 spec,
1382  * which covers implementation details that had previously been
1383  * left open.
1384  */
1385
1386 int agp3_generic_fetch_size(void)
1387 {
1388         u16 temp_size;
1389         int i;
1390         struct aper_size_info_16 *values;
1391
1392         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1393         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1394
1395         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1396                 if (temp_size == values[i].size_value) {
1397                         agp_bridge->previous_size =
1398                                 agp_bridge->current_size = (void *) (values + i);
1399
1400                         agp_bridge->aperture_size_idx = i;
1401                         return values[i].size;
1402                 }
1403         }
1404         return 0;
1405 }
1406 EXPORT_SYMBOL(agp3_generic_fetch_size);
1407
1408 void agp3_generic_tlbflush(struct agp_memory *mem)
1409 {
1410         u32 ctrl;
1411         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1412         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1413         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1414 }
1415 EXPORT_SYMBOL(agp3_generic_tlbflush);
1416
1417 int agp3_generic_configure(void)
1418 {
1419         u32 temp;
1420         struct aper_size_info_16 *current_size;
1421
1422         current_size = A_SIZE_16(agp_bridge->current_size);
1423
1424         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1425         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1426
1427         /* set aperture size */
1428         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1429         /* set gart pointer */
1430         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1431         /* enable aperture and GTLB */
1432         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1433         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1434         return 0;
1435 }
1436 EXPORT_SYMBOL(agp3_generic_configure);
1437
1438 void agp3_generic_cleanup(void)
1439 {
1440         u32 ctrl;
1441         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1442         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1443 }
1444 EXPORT_SYMBOL(agp3_generic_cleanup);
1445
1446 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1447 {
1448         {4096, 1048576, 10,0x000},
1449         {2048,  524288, 9, 0x800},
1450         {1024,  262144, 8, 0xc00},
1451         { 512,  131072, 7, 0xe00},
1452         { 256,   65536, 6, 0xf00},
1453         { 128,   32768, 5, 0xf20},
1454         {  64,   16384, 4, 0xf30},
1455         {  32,    8192, 3, 0xf38},
1456         {  16,    4096, 2, 0xf3c},
1457         {   8,    2048, 1, 0xf3e},
1458         {   4,    1024, 0, 0xf3f}
1459 };
1460 EXPORT_SYMBOL(agp3_generic_sizes);
1461