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