drivers/char/agp/generic.c

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