drivers/char/agp/generic.c

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