drivers/char/agp/generic.c

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