drivers/char/agp/generic.c

   1 /*
   2  * AGPGART driver.
   3  * Copyright (C) 2002-2003 Dave Jones.
   4  * Copyright (C) 1999 Jeff Hartmann.
   5  * Copyright (C) 1999 Precision Insight, Inc.
   6  * Copyright (C) 1999 Xi Graphics, Inc.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
  24  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * TODO:
  27  * - Allocate more than order 0 pages to avoid too much linear map splitting.
  28  */
  29 #include <linux/config.h>
  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 "agp.h"
  39
  40 __u32 *agp_gatt_table;
  41 int agp_memory_reserved;
  42
  43 /*
  44  * Needed by the Nforce GART driver for the time being. Would be
  45  * nice to do this some other way instead of needing this export.
  46  */
  47 EXPORT_SYMBOL_GPL(agp_memory_reserved);
  48
  49 /*
  50  * Generic routines for handling agp_memory structures -
  51  * They use the basic page allocation routines to do the brunt of the work.
  52  */
  53
  54 void agp_free_key(int key)
  55 {
  56         if (key < 0)
  57                 return;
  58
  59         if (key < MAXKEY)
  60                 clear_bit(key, agp_bridge->key_list);
  61 }
  62 EXPORT_SYMBOL(agp_free_key);
  63
  64
  65 static int agp_get_key(void)
  66 {
  67         int bit;
  68
  69         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  70         if (bit < MAXKEY) {
  71                 set_bit(bit, agp_bridge->key_list);
  72                 return bit;
  73         }
  74         return -1;
  75 }
  76
  77
  78 struct agp_memory *agp_create_memory(int scratch_pages)
  79 {
  80         struct agp_memory *new;
  81
  82         new = kmalloc(sizeof(struct agp_memory), GFP_KERNEL);
  83
  84         if (new == NULL)
  85                 return NULL;
  86
  87         memset(new, 0, sizeof(struct agp_memory));
  88         new->key = agp_get_key();
  89
  90         if (new->key < 0) {
  91                 kfree(new);
  92                 return NULL;
  93         }
  94         new->memory = vmalloc(PAGE_SIZE * scratch_pages);
  95
  96         if (new->memory == NULL) {
  97                 agp_free_key(new->key);
  98                 kfree(new);
  99                 return NULL;
 100         }
 101         new->num_scratch_pages = scratch_pages;
 102         return new;
 103 }
 104 EXPORT_SYMBOL(agp_create_memory);
 105
 106 /**
 107  *      agp_free_memory - free memory associated with an agp_memory pointer.
 108  *
 109  *      @curr:          agp_memory pointer to be freed.
 110  *
 111  *      It is the only function that can be called when the backend is not owned
 112  *      by the caller.  (So it can free memory on client death.)
 113  */
 114 void agp_free_memory(struct agp_memory *curr)
 115 {
 116         size_t i;
 117
 118         if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
 119                 return;
 120
 121         if (curr->is_bound == TRUE)
 122                 agp_unbind_memory(curr);
 123
 124         if (curr->type != 0) {
 125                 agp_bridge->driver->free_by_type(curr);
 126                 return;
 127         }
 128         if (curr->page_count != 0) {
 129                 for (i = 0; i < curr->page_count; i++) {
 130                         agp_bridge->driver->agp_destroy_page(phys_to_virt(curr->memory[i]));
 131                 }
 132         }
 133         agp_free_key(curr->key);
 134         vfree(curr->memory);
 135         kfree(curr);
 136 }
 137 EXPORT_SYMBOL(agp_free_memory);
 138
 139 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 140
 141 /**
 142  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 143  *
 144  *      @page_count:    size_t argument of the number of pages
 145  *      @type:  u32 argument of the type of memory to be allocated.
 146  *
 147  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 148  *      maps to physical ram.  Any other type is device dependent.
 149  *
 150  *      It returns NULL whenever memory is unavailable.
 151  */
 152 struct agp_memory *agp_allocate_memory(size_t page_count, u32 type)
 153 {
 154         int scratch_pages;
 155         struct agp_memory *new;
 156         size_t i;
 157
 158         if (agp_bridge->type == NOT_SUPPORTED)
 159                 return NULL;
 160
 161         if ((atomic_read(&agp_bridge->current_memory_agp) + page_count) > agp_bridge->max_memory_agp)
 162                 return NULL;
 163
 164         if (type != 0) {
 165                 new = agp_bridge->driver->alloc_by_type(page_count, type);
 166                 return new;
 167         }
 168
 169         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 170
 171         new = agp_create_memory(scratch_pages);
 172
 173         if (new == NULL)
 174                 return NULL;
 175
 176         for (i = 0; i < page_count; i++) {
 177                 void *addr = agp_bridge->driver->agp_alloc_page();
 178
 179                 if (addr == NULL) {
 180                         agp_free_memory(new);
 181                         return NULL;
 182                 }
 183                 new->memory[i] =
 184                         agp_bridge->driver->mask_memory(virt_to_phys(addr), type);
 185                 new->page_count++;
 186         }
 187
 188         flush_agp_mappings();
 189
 190         return new;
 191 }
 192 EXPORT_SYMBOL(agp_allocate_memory);
 193
 194
 195 /* End - Generic routines for handling agp_memory structures */
 196
 197
 198 static int agp_return_size(void)
 199 {
 200         int current_size;
 201         void *temp;
 202
 203         temp = agp_bridge->current_size;
 204
 205         switch (agp_bridge->driver->size_type) {
 206         case U8_APER_SIZE:
 207                 current_size = A_SIZE_8(temp)->size;
 208                 break;
 209         case U16_APER_SIZE:
 210                 current_size = A_SIZE_16(temp)->size;
 211                 break;
 212         case U32_APER_SIZE:
 213                 current_size = A_SIZE_32(temp)->size;
 214                 break;
 215         case LVL2_APER_SIZE:
 216                 current_size = A_SIZE_LVL2(temp)->size;
 217                 break;
 218         case FIXED_APER_SIZE:
 219                 current_size = A_SIZE_FIX(temp)->size;
 220                 break;
 221         default:
 222                 current_size = 0;
 223                 break;
 224         }
 225
 226         current_size -= (agp_memory_reserved / (1024*1024));
 227         if (current_size <0)
 228                 current_size = 0;
 229         return current_size;
 230 }
 231
 232
 233 int agp_num_entries(void)
 234 {
 235         int num_entries;
 236         void *temp;
 237
 238         temp = agp_bridge->current_size;
 239
 240         switch (agp_bridge->driver->size_type) {
 241         case U8_APER_SIZE:
 242                 num_entries = A_SIZE_8(temp)->num_entries;
 243                 break;
 244         case U16_APER_SIZE:
 245                 num_entries = A_SIZE_16(temp)->num_entries;
 246                 break;
 247         case U32_APER_SIZE:
 248                 num_entries = A_SIZE_32(temp)->num_entries;
 249                 break;
 250         case LVL2_APER_SIZE:
 251                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 252                 break;
 253         case FIXED_APER_SIZE:
 254                 num_entries = A_SIZE_FIX(temp)->num_entries;
 255                 break;
 256         default:
 257                 num_entries = 0;
 258                 break;
 259         }
 260
 261         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 262         if (num_entries<0)
 263                 num_entries = 0;
 264         return num_entries;
 265 }
 266 EXPORT_SYMBOL_GPL(agp_num_entries);
 267
 268
 269 /**
 270  *      agp_copy_info  -  copy bridge state information
 271  *
 272  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 273  *
 274  *      This function copies information about the agp bridge device and the state of
 275  *      the agp backend into an agp_kern_info pointer.
 276  */
 277 int agp_copy_info(struct agp_kern_info *info)
 278 {
 279         memset(info, 0, sizeof(struct agp_kern_info));
 280         if (!agp_bridge || agp_bridge->type == NOT_SUPPORTED ||
 281             !agp_bridge->version) {
 282                 info->chipset = NOT_SUPPORTED;
 283                 return -EIO;
 284         }
 285
 286         info->version.major = agp_bridge->version->major;
 287         info->version.minor = agp_bridge->version->minor;
 288         info->chipset = agp_bridge->type;
 289         info->device = agp_bridge->dev;
 290         info->mode = agp_bridge->mode;
 291         info->aper_base = agp_bridge->gart_bus_addr;
 292         info->aper_size = agp_return_size();
 293         info->max_memory = agp_bridge->max_memory_agp;
 294         info->current_memory = atomic_read(&agp_bridge->current_memory_agp);
 295         info->cant_use_aperture = agp_bridge->driver->cant_use_aperture;
 296         info->vm_ops = agp_bridge->vm_ops;
 297         info->page_mask = ~0UL;
 298         return 0;
 299 }
 300 EXPORT_SYMBOL(agp_copy_info);
 301
 302
 303 /* End - Routine to copy over information structure */
 304
 305
 306 /*
 307  * Routines for handling swapping of agp_memory into the GATT -
 308  * These routines take agp_memory and insert them into the GATT.
 309  * They call device specific routines to actually write to the GATT.
 310  */
 311
 312 /**
 313  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 314  *
 315  *      @curr:          agp_memory pointer
 316  *      @pg_start:      an offset into the graphics aperture translation table
 317  *
 318  *      It returns -EINVAL if the pointer == NULL.
 319  *      It returns -EBUSY if the area of the table requested is already in use.
 320  */
 321 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 322 {
 323         int ret_val;
 324
 325         if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
 326                 return -EINVAL;
 327
 328         if (curr->is_bound == TRUE) {
 329                 printk (KERN_INFO PFX "memory %p is already bound!\n", curr);
 330                 return -EINVAL;
 331         }
 332         if (curr->is_flushed == FALSE) {
 333                 agp_bridge->driver->cache_flush();
 334                 curr->is_flushed = TRUE;
 335         }
 336         ret_val = agp_bridge->driver->insert_memory(curr, pg_start, curr->type);
 337
 338         if (ret_val != 0)
 339                 return ret_val;
 340
 341         curr->is_bound = TRUE;
 342         curr->pg_start = pg_start;
 343         return 0;
 344 }
 345 EXPORT_SYMBOL(agp_bind_memory);
 346
 347
 348 /**
 349  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 350  *
 351  * @curr:       agp_memory pointer to be removed from the GATT.
 352  *
 353  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 354  * the graphics aperture translation table or if the agp_memory pointer == NULL
 355  */
 356 int agp_unbind_memory(struct agp_memory *curr)
 357 {
 358         int ret_val;
 359
 360         if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
 361                 return -EINVAL;
 362
 363         if (curr->is_bound != TRUE) {
 364                 printk (KERN_INFO PFX "memory %p was not bound!\n", curr);
 365                 return -EINVAL;
 366         }
 367
 368         ret_val = agp_bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 369
 370         if (ret_val != 0)
 371                 return ret_val;
 372
 373         curr->is_bound = FALSE;
 374         curr->pg_start = 0;
 375         return 0;
 376 }
 377 EXPORT_SYMBOL(agp_unbind_memory);
 378
 379 /* End - Routines for handling swapping of agp_memory into the GATT */
 380
 381
 382 /* Generic Agp routines - Start */
 383 static void agp_v2_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
 384 {
 385         /* disable SBA if it's not supported */
 386         if (!((*cmd & AGPSTAT_SBA) && (*tmp & AGPSTAT_SBA) && (*mode & AGPSTAT_SBA)))
 387                 *cmd &= ~AGPSTAT_SBA;
 388
 389         /* Set speed */
 390         if (!((*cmd & AGPSTAT2_4X) && (*tmp & AGPSTAT2_4X) && (*mode & AGPSTAT2_4X)))
 391                 *cmd &= ~AGPSTAT2_4X;
 392
 393         if (!((*cmd & AGPSTAT2_2X) && (*tmp & AGPSTAT2_2X) && (*mode & AGPSTAT2_2X)))
 394                 *cmd &= ~AGPSTAT2_2X;
 395
 396         if (!((*cmd & AGPSTAT2_1X) && (*tmp & AGPSTAT2_1X) && (*mode & AGPSTAT2_1X)))
 397                 *cmd &= ~AGPSTAT2_1X;
 398
 399         /* Now we know what mode it should be, clear out the unwanted bits. */
 400         if (*cmd & AGPSTAT2_4X)
 401                 *cmd &= ~(AGPSTAT2_1X | AGPSTAT2_2X);   /* 4X */
 402
 403         if (*cmd & AGPSTAT2_2X)
 404                 *cmd &= ~(AGPSTAT2_1X | AGPSTAT2_4X);   /* 2X */
 405
 406         if (*cmd & AGPSTAT2_1X)
 407                 *cmd &= ~(AGPSTAT2_2X | AGPSTAT2_4X);   /* 1Xf */
 408 }
 409
 410
 411 static void agp_v3_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
 412 {
 413         /* ARQSZ - Set the value to the maximum one.
 414          * Don't allow the mode register to override values. */
 415         *cmd = ((*cmd & ~AGPSTAT_ARQSZ) |
 416                 max_t(u32,(*cmd & AGPSTAT_ARQSZ),(*tmp & AGPSTAT_ARQSZ)));
 417
 418         /* Calibration cycle.
 419          * Don't allow the mode register to override values. */
 420         *cmd = ((*cmd & ~AGPSTAT_CAL_MASK) |
 421                 min_t(u32,(*cmd & AGPSTAT_CAL_MASK),(*tmp & AGPSTAT_CAL_MASK)));
 422
 423         /* SBA *must* be supported for AGP v3 */
 424         *cmd |= AGPSTAT_SBA;
 425
 426         /*
 427          * Set speed.
 428          * Check for invalid speeds. This can happen when applications
 429          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 430          */
 431         if (*mode & AGPSTAT_MODE_3_0) {
 432                 /*
 433                  * Caller hasn't a clue what its doing. We are in 3.0 mode,
 434                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 435                  * AGP2.x 4x -> AGP3.0 4x.
 436                  */
 437                 if (*mode & AGPSTAT2_4X) {
 438                         printk (KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 439                                                 current->comm, *mode);
 440                         *mode &= ~AGPSTAT2_4X;
 441                         *mode |= AGPSTAT3_4X;
 442                 }
 443         } else {
 444                 /*
 445                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 446                  * but have been passed an AGP 2.x mode.
 447                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 448                  */
 449                 printk (KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 450                                         current->comm, *mode);
 451                 *mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 452                 *mode |= AGPSTAT3_4X;
 453         }
 454
 455         if (!((*cmd & AGPSTAT3_8X) && (*tmp & AGPSTAT3_8X) && (*mode & AGPSTAT3_8X)))
 456                 *cmd &= ~AGPSTAT3_8X;
 457
 458         if (!((*cmd & AGPSTAT3_4X) && (*tmp & AGPSTAT3_4X) && (*mode & AGPSTAT3_4X)))
 459                 *cmd &= ~AGPSTAT3_4X;
 460
 461         /* Clear out unwanted bits. */
 462         if (*cmd & AGPSTAT3_8X)
 463                 *cmd &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 464         if (*cmd & AGPSTAT3_4X)
 465                 *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 466 }
 467
 468 //FIXME: This doesn't smell right.
 469 //We need a function we pass an agp_device to.
 470 u32 agp_collect_device_status(u32 mode, u32 cmd)
 471 {
 472         struct pci_dev *device = NULL;
 473         u8 cap_ptr;
 474         u32 tmp;
 475         u32 agp3;
 476
 477         while ((device = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, device)) != NULL) {
 478                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 479                 if (!cap_ptr)
 480                         continue;
 481
 482                 /*
 483                  * Ok, here we have a AGP device. Disable impossible
 484                  * settings, and adjust the readqueue to the minimum.
 485                  */
 486                 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &tmp);
 487
 488                 /* adjust RQ depth */
 489                 cmd = ((cmd & ~AGPSTAT_RQ_DEPTH) |
 490                      min_t(u32, (mode & AGPSTAT_RQ_DEPTH),
 491                          min_t(u32, (cmd & AGPSTAT_RQ_DEPTH), (tmp & AGPSTAT_RQ_DEPTH))));
 492
 493                 /* disable FW if it's not supported */
 494                 if (!((cmd & AGPSTAT_FW) && (tmp & AGPSTAT_FW) && (mode & AGPSTAT_FW)))
 495                         cmd &= ~AGPSTAT_FW;
 496
 497                 /* Check to see if we are operating in 3.0 mode */
 498                 pci_read_config_dword(device, cap_ptr+AGPSTAT, &agp3);
 499                 if (agp3 & AGPSTAT_MODE_3_0) {
 500                         agp_v3_parse_one(&mode, &cmd, &tmp);
 501                 } else {
 502                         agp_v2_parse_one(&mode, &cmd, &tmp);
 503                 }
 504         }
 505         return cmd;
 506 }
 507 EXPORT_SYMBOL(agp_collect_device_status);
 508
 509
 510 void agp_device_command(u32 command, int agp_v3)
 511 {
 512         struct pci_dev *device = NULL;
 513         int mode;
 514
 515         mode = command & 0x7;
 516         if (agp_v3)
 517                 mode *= 4;
 518
 519         while ((device = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, device)) != NULL) {
 520                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 521                 if (!agp)
 522                         continue;
 523
 524                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
 525                                 agp_v3 ? 3 : 2, pci_name(device), mode);
 526                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, command);
 527         }
 528 }
 529 EXPORT_SYMBOL(agp_device_command);
 530
 531
 532 void get_agp_version(struct agp_bridge_data *bridge)
 533 {
 534         u32 ncapid;
 535
 536         /* Exit early if already set by errata workarounds. */
 537         if (agp_bridge->major_version != 0)
 538                 return;
 539
 540         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx, &ncapid);
 541         agp_bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 542         agp_bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 543 }
 544 EXPORT_SYMBOL(get_agp_version);
 545
 546
 547 void agp_generic_enable(u32 mode)
 548 {
 549         u32 command, temp;
 550         u32 agp3;
 551
 552         get_agp_version(agp_bridge);
 553
 554         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
 555                                 agp_bridge->major_version,
 556                                 agp_bridge->minor_version,
 557                                 agp_bridge->dev->slot_name);
 558
 559         pci_read_config_dword(agp_bridge->dev,
 560                       agp_bridge->capndx + PCI_AGP_STATUS, &command);
 561
 562         command = agp_collect_device_status(mode, command);
 563         command |= AGPSTAT_AGP_ENABLE;
 564
 565         /* Do AGP version specific frobbing. */
 566         if(agp_bridge->major_version >= 3) {
 567                 pci_read_config_dword(agp_bridge->dev,
 568                         agp_bridge->capndx+AGPSTAT, &agp3);
 569
 570                 /* Check to see if we are operating in 3.0 mode */
 571                 if (agp3 & AGPSTAT_MODE_3_0) {
 572                         /* If we have 3.5, we can do the isoch stuff. */
 573                         if (agp_bridge->minor_version >= 5)
 574                                 agp_3_5_enable(agp_bridge);
 575                         agp_device_command(command, TRUE);
 576                         return;
 577                 } else {
 578                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 579                     command &= ~(7<<10) ;
 580                     pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
 581                     temp |= (1<<9);
 582                     pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp);
 583
 584                     printk (KERN_INFO PFX "Device is in legacy mode,"
 585                                 " falling back to 2.x\n");
 586                 }
 587         }
 588
 589         /* AGP v<3 */
 590         agp_device_command(command, FALSE);
 591 }
 592 EXPORT_SYMBOL(agp_generic_enable);
 593
 594
 595 int agp_generic_create_gatt_table(void)
 596 {
 597         char *table;
 598         char *table_end;
 599         int size;
 600         int page_order;
 601         int num_entries;
 602         int i;
 603         void *temp;
 604         struct page *page;
 605
 606         /* The generic routines can't handle 2 level gatt's */
 607         if (agp_bridge->driver->size_type == LVL2_APER_SIZE)
 608                 return -EINVAL;
 609
 610         table = NULL;
 611         i = agp_bridge->aperture_size_idx;
 612         temp = agp_bridge->current_size;
 613         size = page_order = num_entries = 0;
 614
 615         if (agp_bridge->driver->size_type != FIXED_APER_SIZE) {
 616                 do {
 617                         switch (agp_bridge->driver->size_type) {
 618                         case U8_APER_SIZE:
 619                                 size = A_SIZE_8(temp)->size;
 620                                 page_order =
 621                                     A_SIZE_8(temp)->page_order;
 622                                 num_entries =
 623                                     A_SIZE_8(temp)->num_entries;
 624                                 break;
 625                         case U16_APER_SIZE:
 626                                 size = A_SIZE_16(temp)->size;
 627                                 page_order = A_SIZE_16(temp)->page_order;
 628                                 num_entries = A_SIZE_16(temp)->num_entries;
 629                                 break;
 630                         case U32_APER_SIZE:
 631                                 size = A_SIZE_32(temp)->size;
 632                                 page_order = A_SIZE_32(temp)->page_order;
 633                                 num_entries = A_SIZE_32(temp)->num_entries;
 634                                 break;
 635                                 /* This case will never really happen. */
 636                         case FIXED_APER_SIZE:
 637                         case LVL2_APER_SIZE:
 638                         default:
 639                                 size = page_order = num_entries = 0;
 640                                 break;
 641                         }
 642
 643                         table = (char *) __get_free_pages(GFP_KERNEL,
 644                                                           page_order);
 645
 646                         if (table == NULL) {
 647                                 i++;
 648                                 switch (agp_bridge->driver->size_type) {
 649                                 case U8_APER_SIZE:
 650                                         agp_bridge->current_size = A_IDX8(agp_bridge);
 651                                         break;
 652                                 case U16_APER_SIZE:
 653                                         agp_bridge->current_size = A_IDX16(agp_bridge);
 654                                         break;
 655                                 case U32_APER_SIZE:
 656                                         agp_bridge->current_size = A_IDX32(agp_bridge);
 657                                         break;
 658                                         /* This case will never really happen. */
 659                                 case FIXED_APER_SIZE:
 660                                 case LVL2_APER_SIZE:
 661                                 default:
 662                                         agp_bridge->current_size =
 663                                             agp_bridge->current_size;
 664                                         break;
 665                                 }
 666                                 temp = agp_bridge->current_size;
 667                         } else {
 668                                 agp_bridge->aperture_size_idx = i;
 669                         }
 670                 } while (!table && (i < agp_bridge->driver->num_aperture_sizes));
 671         } else {
 672                 size = ((struct aper_size_info_fixed *) temp)->size;
 673                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 674                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 675                 table = (char *) __get_free_pages(GFP_KERNEL, page_order);
 676         }
 677
 678         if (table == NULL)
 679                 return -ENOMEM;
 680
 681         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 682
 683         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 684                 SetPageReserved(page);
 685
 686         agp_bridge->gatt_table_real = (u32 *) table;
 687         agp_gatt_table = (void *)table;
 688
 689         agp_bridge->driver->cache_flush();
 690         agp_bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
 691                                         (PAGE_SIZE * (1 << page_order)));
 692         agp_bridge->driver->cache_flush();
 693
 694         if (agp_bridge->gatt_table == NULL) {
 695                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 696                         ClearPageReserved(page);
 697
 698                 free_pages((unsigned long) table, page_order);
 699
 700                 return -ENOMEM;
 701         }
 702         agp_bridge->gatt_bus_addr = virt_to_phys(agp_bridge->gatt_table_real);
 703
 704         /* AK: bogus, should encode addresses > 4GB */
 705         for (i = 0; i < num_entries; i++)
 706                 agp_bridge->gatt_table[i] = (unsigned long) agp_bridge->scratch_page;
 707
 708         return 0;
 709 }
 710 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 711
 712 int agp_generic_free_gatt_table(void)
 713 {
 714         int page_order;
 715         char *table, *table_end;
 716         void *temp;
 717         struct page *page;
 718
 719         temp = agp_bridge->current_size;
 720
 721         switch (agp_bridge->driver->size_type) {
 722         case U8_APER_SIZE:
 723                 page_order = A_SIZE_8(temp)->page_order;
 724                 break;
 725         case U16_APER_SIZE:
 726                 page_order = A_SIZE_16(temp)->page_order;
 727                 break;
 728         case U32_APER_SIZE:
 729                 page_order = A_SIZE_32(temp)->page_order;
 730                 break;
 731         case FIXED_APER_SIZE:
 732                 page_order = A_SIZE_FIX(temp)->page_order;
 733                 break;
 734         case LVL2_APER_SIZE:
 735                 /* The generic routines can't deal with 2 level gatt's */
 736                 return -EINVAL;
 737                 break;
 738         default:
 739                 page_order = 0;
 740                 break;
 741         }
 742
 743         /* Do not worry about freeing memory, because if this is
 744          * called, then all agp memory is deallocated and removed
 745          * from the table. */
 746
 747         iounmap(agp_bridge->gatt_table);
 748         table = (char *) agp_bridge->gatt_table_real;
 749         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 750
 751         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 752                 ClearPageReserved(page);
 753
 754         free_pages((unsigned long) agp_bridge->gatt_table_real, page_order);
 755
 756         agp_gatt_table = NULL;
 757         agp_bridge->gatt_table = NULL;
 758         agp_bridge->gatt_table_real = NULL;
 759         agp_bridge->gatt_bus_addr = 0;
 760
 761         return 0;
 762 }
 763 EXPORT_SYMBOL(agp_generic_free_gatt_table);
 764
 765
 766 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
 767 {
 768         int num_entries;
 769         size_t i;
 770         off_t j;
 771         void *temp;
 772
 773         temp = agp_bridge->current_size;
 774
 775         switch (agp_bridge->driver->size_type) {
 776         case U8_APER_SIZE:
 777                 num_entries = A_SIZE_8(temp)->num_entries;
 778                 break;
 779         case U16_APER_SIZE:
 780                 num_entries = A_SIZE_16(temp)->num_entries;
 781                 break;
 782         case U32_APER_SIZE:
 783                 num_entries = A_SIZE_32(temp)->num_entries;
 784                 break;
 785         case FIXED_APER_SIZE:
 786                 num_entries = A_SIZE_FIX(temp)->num_entries;
 787                 break;
 788         case LVL2_APER_SIZE:
 789                 /* The generic routines can't deal with 2 level gatt's */
 790                 return -EINVAL;
 791                 break;
 792         default:
 793                 num_entries = 0;
 794                 break;
 795         }
 796
 797         num_entries -= agp_memory_reserved/PAGE_SIZE;
 798         if (num_entries < 0) num_entries = 0;
 799
 800         if (type != 0 || mem->type != 0) {
 801                 /* The generic routines know nothing of memory types */
 802                 return -EINVAL;
 803         }
 804
 805         /* AK: could wrap */
 806         if ((pg_start + mem->page_count) > num_entries)
 807                 return -EINVAL;
 808
 809         j = pg_start;
 810
 811         while (j < (pg_start + mem->page_count)) {
 812                 if (!PGE_EMPTY(agp_bridge, agp_bridge->gatt_table[j])) {
 813                         return -EBUSY;
 814                 }
 815                 j++;
 816         }
 817
 818         if (mem->is_flushed == FALSE) {
 819                 agp_bridge->driver->cache_flush();
 820                 mem->is_flushed = TRUE;
 821         }
 822
 823         for (i = 0, j = pg_start; i < mem->page_count; i++, j++)
 824                 agp_bridge->gatt_table[j] =
 825                                 agp_bridge->driver->mask_memory(
 826                                                 mem->memory[i], mem->type);
 827
 828         agp_bridge->driver->tlb_flush(mem);
 829         return 0;
 830 }
 831 EXPORT_SYMBOL(agp_generic_insert_memory);
 832
 833
 834 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 835 {
 836         size_t i;
 837
 838         if (type != 0 || mem->type != 0) {
 839                 /* The generic routines know nothing of memory types */
 840                 return -EINVAL;
 841         }
 842
 843         /* AK: bogus, should encode addresses > 4GB */
 844         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
 845                 agp_bridge->gatt_table[i] =
 846                     (unsigned long) agp_bridge->scratch_page;
 847         }
 848
 849         agp_bridge->driver->tlb_flush(mem);
 850         return 0;
 851 }
 852 EXPORT_SYMBOL(agp_generic_remove_memory);
 853
 854
 855 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
 856 {
 857         return NULL;
 858 }
 859 EXPORT_SYMBOL(agp_generic_alloc_by_type);
 860
 861
 862 void agp_generic_free_by_type(struct agp_memory *curr)
 863 {
 864         if (curr->memory != NULL)
 865                 vfree(curr->memory);
 866
 867         agp_free_key(curr->key);
 868         kfree(curr);
 869 }
 870 EXPORT_SYMBOL(agp_generic_free_by_type);
 871
 872
 873 /*
 874  * Basic Page Allocation Routines -
 875  * These routines handle page allocation and by default they reserve the allocated
 876  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
 877  * against a maximum value.
 878  */
 879
 880 void *agp_generic_alloc_page(void)
 881 {
 882         struct page * page;
 883
 884         page = alloc_page(GFP_KERNEL);
 885         if (page == NULL)
 886                 return 0;
 887
 888         map_page_into_agp(page);
 889
 890         get_page(page);
 891         SetPageLocked(page);
 892         atomic_inc(&agp_bridge->current_memory_agp);
 893         return page_address(page);
 894 }
 895 EXPORT_SYMBOL(agp_generic_alloc_page);
 896
 897
 898 void agp_generic_destroy_page(void *addr)
 899 {
 900         struct page *page;
 901
 902         if (addr == NULL)
 903                 return;
 904
 905         page = virt_to_page(addr);
 906         unmap_page_from_agp(page);
 907         put_page(page);
 908         unlock_page(page);
 909         free_page((unsigned long)addr);
 910         atomic_dec(&agp_bridge->current_memory_agp);
 911 }
 912 EXPORT_SYMBOL(agp_generic_destroy_page);
 913
 914 /* End Basic Page Allocation Routines */
 915
 916
 917 /**
 918  * agp_enable  -  initialise the agp point-to-point connection.
 919  *
 920  * @mode:       agp mode register value to configure with.
 921  */
 922 void agp_enable(u32 mode)
 923 {
 924         if (agp_bridge->type == NOT_SUPPORTED)
 925                 return;
 926         agp_bridge->driver->agp_enable(mode);
 927 }
 928 EXPORT_SYMBOL(agp_enable);
 929
 930
 931 #ifdef CONFIG_SMP
 932 static void ipi_handler(void *null)
 933 {
 934         flush_agp_cache();
 935 }
 936 #endif
 937
 938 void global_cache_flush(void)
 939 {
 940 #ifdef CONFIG_SMP
 941         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
 942                 panic(PFX "timed out waiting for the other CPUs!\n");
 943 #else
 944         flush_agp_cache();
 945 #endif
 946 }
 947 EXPORT_SYMBOL(global_cache_flush);
 948
 949 unsigned long agp_generic_mask_memory(unsigned long addr, int type)
 950 {
 951         /* memory type is ignored in the generic routine */
 952         if (agp_bridge->driver->masks)
 953                 return addr | agp_bridge->driver->masks[0].mask;
 954         else
 955                 return addr;
 956 }
 957 EXPORT_SYMBOL(agp_generic_mask_memory);
 958
 959 /*
 960  * These functions are implemented according to the AGPv3 spec,
 961  * which covers implementation details that had previously been
 962  * left open.
 963  */
 964
 965 int agp3_generic_fetch_size(void)
 966 {
 967         u16 temp_size;
 968         int i;
 969         struct aper_size_info_16 *values;
 970
 971         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
 972         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
 973
 974         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
 975                 if (temp_size == values[i].size_value) {
 976                         agp_bridge->previous_size =
 977                                 agp_bridge->current_size = (void *) (values + i);
 978
 979                         agp_bridge->aperture_size_idx = i;
 980                         return values[i].size;
 981                 }
 982         }
 983         return 0;
 984 }
 985 EXPORT_SYMBOL(agp3_generic_fetch_size);
 986
 987 void agp3_generic_tlbflush(struct agp_memory *mem)
 988 {
 989         u32 ctrl;
 990         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
 991         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
 992         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
 993 }
 994 EXPORT_SYMBOL(agp3_generic_tlbflush);
 995
 996 int agp3_generic_configure(void)
 997 {
 998         u32 temp;
 999         struct aper_size_info_16 *current_size;
1000
1001         current_size = A_SIZE_16(agp_bridge->current_size);
1002
1003         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1004         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1005
1006         /* set aperture size */
1007         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1008         /* set gart pointer */
1009         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1010         /* enable aperture and GTLB */
1011         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1012         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1013         return 0;
1014 }
1015 EXPORT_SYMBOL(agp3_generic_configure);
1016
1017 void agp3_generic_cleanup(void)
1018 {
1019         u32 ctrl;
1020         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1021         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1022 }
1023 EXPORT_SYMBOL(agp3_generic_cleanup);
1024
1025 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1026 {
1027         {4096, 1048576, 10,0x000},
1028         {2048,  524288, 9, 0x800},
1029         {1024,  262144, 8, 0xc00},
1030         { 512,  131072, 7, 0xe00},
1031         { 256,   65536, 6, 0xf00},
1032         { 128,   32768, 5, 0xf20},
1033         {  64,   16384, 4, 0xf30},
1034         {  32,    8192, 3, 0xf38},
1035         {  16,    4096, 2, 0xf3c},
1036         {   8,    2048, 1, 0xf3e},
1037         {   4,    1024, 0, 0xf3f}
1038 };
1039 EXPORT_SYMBOL(agp3_generic_sizes);
1040