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/config.h>
  31 #include <linux/module.h>
  32 #include <linux/pci.h>
  33 #include <linux/init.h>
  34 #include <linux/pagemap.h>
  35 #include <linux/miscdevice.h>
  36 #include <linux/pm.h>
  37 #include <linux/agp_backend.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/mm.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 #if defined(CONFIG_X86)
  56 int map_page_into_agp(struct page *page)
  57 {
  58         int i;
  59         i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
  60         global_flush_tlb();
  61         return i;
  62 }
  63 EXPORT_SYMBOL_GPL(map_page_into_agp);
  64
  65 int unmap_page_from_agp(struct page *page)
  66 {
  67         int i;
  68         i = change_page_attr(page, 1, PAGE_KERNEL);
  69         global_flush_tlb();
  70         return i;
  71 }
  72 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
  73 #endif
  74
  75 /*
  76  * Generic routines for handling agp_memory structures -
  77  * They use the basic page allocation routines to do the brunt of the work.
  78  */
  79
  80 void agp_free_key(int key)
  81 {
  82         if (key < 0)
  83                 return;
  84
  85         if (key < MAXKEY)
  86                 clear_bit(key, agp_bridge->key_list);
  87 }
  88 EXPORT_SYMBOL(agp_free_key);
  89
  90
  91 static int agp_get_key(void)
  92 {
  93         int bit;
  94
  95         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  96         if (bit < MAXKEY) {
  97                 set_bit(bit, agp_bridge->key_list);
  98                 return bit;
  99         }
 100         return -1;
 101 }
 102
 103
 104 struct agp_memory *agp_create_memory(int scratch_pages)
 105 {
 106         struct agp_memory *new;
 107
 108         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 109         if (new == NULL)
 110                 return NULL;
 111
 112         new->key = agp_get_key();
 113
 114         if (new->key < 0) {
 115                 kfree(new);
 116                 return NULL;
 117         }
 118         new->memory = vmalloc(PAGE_SIZE * scratch_pages);
 119
 120         if (new->memory == NULL) {
 121                 agp_free_key(new->key);
 122                 kfree(new);
 123                 return NULL;
 124         }
 125         new->num_scratch_pages = scratch_pages;
 126         return new;
 127 }
 128 EXPORT_SYMBOL(agp_create_memory);
 129
 130 /**
 131  *      agp_free_memory - free memory associated with an agp_memory pointer.
 132  *
 133  *      @curr:          agp_memory pointer to be freed.
 134  *
 135  *      It is the only function that can be called when the backend is not owned
 136  *      by the caller.  (So it can free memory on client death.)
 137  */
 138 void agp_free_memory(struct agp_memory *curr)
 139 {
 140         size_t i;
 141
 142         if (curr == NULL)
 143                 return;
 144
 145         if (curr->is_bound == TRUE)
 146                 agp_unbind_memory(curr);
 147
 148         if (curr->type != 0) {
 149                 curr->bridge->driver->free_by_type(curr);
 150                 return;
 151         }
 152         if (curr->page_count != 0) {
 153                 for (i = 0; i < curr->page_count; i++) {
 154                         curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
 155                 }
 156         }
 157         agp_free_key(curr->key);
 158         vfree(curr->memory);
 159         kfree(curr);
 160 }
 161 EXPORT_SYMBOL(agp_free_memory);
 162
 163 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 164
 165 /**
 166  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 167  *
 168  *      @page_count:    size_t argument of the number of pages
 169  *      @type:  u32 argument of the type of memory to be allocated.
 170  *
 171  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 172  *      maps to physical ram.  Any other type is device dependent.
 173  *
 174  *      It returns NULL whenever memory is unavailable.
 175  */
 176 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 177                                         size_t page_count, u32 type)
 178 {
 179         int scratch_pages;
 180         struct agp_memory *new;
 181         size_t i;
 182
 183         if (!bridge)
 184                 return NULL;
 185
 186         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
 187                 return NULL;
 188
 189         if (type != 0) {
 190                 new = bridge->driver->alloc_by_type(page_count, type);
 191                 if (new)
 192                         new->bridge = bridge;
 193                 return new;
 194         }
 195
 196         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 197
 198         new = agp_create_memory(scratch_pages);
 199
 200         if (new == NULL)
 201                 return NULL;
 202
 203         for (i = 0; i < page_count; i++) {
 204                 void *addr = bridge->driver->agp_alloc_page(bridge);
 205
 206                 if (addr == NULL) {
 207                         agp_free_memory(new);
 208                         return NULL;
 209                 }
 210                 new->memory[i] = virt_to_gart(addr);
 211                 new->page_count++;
 212         }
 213        new->bridge = bridge;
 214
 215         flush_agp_mappings();
 216
 217         return new;
 218 }
 219 EXPORT_SYMBOL(agp_allocate_memory);
 220
 221
 222 /* End - Generic routines for handling agp_memory structures */
 223
 224
 225 static int agp_return_size(void)
 226 {
 227         int current_size;
 228         void *temp;
 229
 230         temp = agp_bridge->current_size;
 231
 232         switch (agp_bridge->driver->size_type) {
 233         case U8_APER_SIZE:
 234                 current_size = A_SIZE_8(temp)->size;
 235                 break;
 236         case U16_APER_SIZE:
 237                 current_size = A_SIZE_16(temp)->size;
 238                 break;
 239         case U32_APER_SIZE:
 240                 current_size = A_SIZE_32(temp)->size;
 241                 break;
 242         case LVL2_APER_SIZE:
 243                 current_size = A_SIZE_LVL2(temp)->size;
 244                 break;
 245         case FIXED_APER_SIZE:
 246                 current_size = A_SIZE_FIX(temp)->size;
 247                 break;
 248         default:
 249                 current_size = 0;
 250                 break;
 251         }
 252
 253         current_size -= (agp_memory_reserved / (1024*1024));
 254         if (current_size <0)
 255                 current_size = 0;
 256         return current_size;
 257 }
 258
 259
 260 int agp_num_entries(void)
 261 {
 262         int num_entries;
 263         void *temp;
 264
 265         temp = agp_bridge->current_size;
 266
 267         switch (agp_bridge->driver->size_type) {
 268         case U8_APER_SIZE:
 269                 num_entries = A_SIZE_8(temp)->num_entries;
 270                 break;
 271         case U16_APER_SIZE:
 272                 num_entries = A_SIZE_16(temp)->num_entries;
 273                 break;
 274         case U32_APER_SIZE:
 275                 num_entries = A_SIZE_32(temp)->num_entries;
 276                 break;
 277         case LVL2_APER_SIZE:
 278                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 279                 break;
 280         case FIXED_APER_SIZE:
 281                 num_entries = A_SIZE_FIX(temp)->num_entries;
 282                 break;
 283         default:
 284                 num_entries = 0;
 285                 break;
 286         }
 287
 288         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 289         if (num_entries<0)
 290                 num_entries = 0;
 291         return num_entries;
 292 }
 293 EXPORT_SYMBOL_GPL(agp_num_entries);
 294
 295
 296 /**
 297  *      agp_copy_info  -  copy bridge state information
 298  *
 299  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 300  *
 301  *      This function copies information about the agp bridge device and the state of
 302  *      the agp backend into an agp_kern_info pointer.
 303  */
 304 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 305 {
 306         memset(info, 0, sizeof(struct agp_kern_info));
 307         if (!bridge) {
 308                 info->chipset = NOT_SUPPORTED;
 309                 return -EIO;
 310         }
 311
 312         info->version.major = bridge->version->major;
 313         info->version.minor = bridge->version->minor;
 314         info->chipset = SUPPORTED;
 315         info->device = bridge->dev;
 316         if (bridge->mode & AGPSTAT_MODE_3_0)
 317                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 318         else
 319                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 320         info->aper_base = bridge->gart_bus_addr;
 321         info->aper_size = agp_return_size();
 322         info->max_memory = bridge->max_memory_agp;
 323         info->current_memory = atomic_read(&bridge->current_memory_agp);
 324         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 325         info->vm_ops = bridge->vm_ops;
 326         info->page_mask = ~0UL;
 327         return 0;
 328 }
 329 EXPORT_SYMBOL(agp_copy_info);
 330
 331 /* End - Routine to copy over information structure */
 332
 333 /*
 334  * Routines for handling swapping of agp_memory into the GATT -
 335  * These routines take agp_memory and insert them into the GATT.
 336  * They call device specific routines to actually write to the GATT.
 337  */
 338
 339 /**
 340  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 341  *
 342  *      @curr:          agp_memory pointer
 343  *      @pg_start:      an offset into the graphics aperture translation table
 344  *
 345  *      It returns -EINVAL if the pointer == NULL.
 346  *      It returns -EBUSY if the area of the table requested is already in use.
 347  */
 348 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 349 {
 350         int ret_val;
 351
 352         if (curr == NULL)
 353                 return -EINVAL;
 354
 355         if (curr->is_bound == TRUE) {
 356                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
 357                 return -EINVAL;
 358         }
 359         if (curr->is_flushed == FALSE) {
 360                 curr->bridge->driver->cache_flush();
 361                 curr->is_flushed = TRUE;
 362         }
 363         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 364
 365         if (ret_val != 0)
 366                 return ret_val;
 367
 368         curr->is_bound = TRUE;
 369         curr->pg_start = pg_start;
 370         return 0;
 371 }
 372 EXPORT_SYMBOL(agp_bind_memory);
 373
 374
 375 /**
 376  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 377  *
 378  * @curr:       agp_memory pointer to be removed from the GATT.
 379  *
 380  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 381  * the graphics aperture translation table or if the agp_memory pointer == NULL
 382  */
 383 int agp_unbind_memory(struct agp_memory *curr)
 384 {
 385         int ret_val;
 386
 387         if (curr == NULL)
 388                 return -EINVAL;
 389
 390         if (curr->is_bound != TRUE) {
 391                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
 392                 return -EINVAL;
 393         }
 394
 395         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 396
 397         if (ret_val != 0)
 398                 return ret_val;
 399
 400         curr->is_bound = FALSE;
 401         curr->pg_start = 0;
 402         return 0;
 403 }
 404 EXPORT_SYMBOL(agp_unbind_memory);
 405
 406 /* End - Routines for handling swapping of agp_memory into the GATT */
 407
 408
 409 /* Generic Agp routines - Start */
 410 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 411 {
 412         u32 tmp;
 413
 414         if (*requested_mode & AGP2_RESERVED_MASK) {
 415                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 416                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
 417                 *requested_mode &= ~AGP2_RESERVED_MASK;
 418         }
 419
 420         /* Check the speed bits make sense. Only one should be set. */
 421         tmp = *requested_mode & 7;
 422         switch (tmp) {
 423                 case 0:
 424                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 425                         *requested_mode |= AGPSTAT2_1X;
 426                         break;
 427                 case 1:
 428                 case 2:
 429                         break;
 430                 case 3:
 431                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 432                         break;
 433                 case 4:
 434                         break;
 435                 case 5:
 436                 case 6:
 437                 case 7:
 438                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 439                         break;
 440         }
 441
 442         /* disable SBA if it's not supported */
 443         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 444                 *bridge_agpstat &= ~AGPSTAT_SBA;
 445
 446         /* Set rate */
 447         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 448                 *bridge_agpstat &= ~AGPSTAT2_4X;
 449
 450         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 451                 *bridge_agpstat &= ~AGPSTAT2_2X;
 452
 453         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 454                 *bridge_agpstat &= ~AGPSTAT2_1X;
 455
 456         /* Now we know what mode it should be, clear out the unwanted bits. */
 457         if (*bridge_agpstat & AGPSTAT2_4X)
 458                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 459
 460         if (*bridge_agpstat & AGPSTAT2_2X)
 461                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 462
 463         if (*bridge_agpstat & AGPSTAT2_1X)
 464                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 465
 466         /* Apply any errata. */
 467         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 468                 *bridge_agpstat &= ~AGPSTAT_FW;
 469
 470         if (agp_bridge->flags & AGP_ERRATA_SBA)
 471                 *bridge_agpstat &= ~AGPSTAT_SBA;
 472
 473         if (agp_bridge->flags & AGP_ERRATA_1X) {
 474                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 475                 *bridge_agpstat |= AGPSTAT2_1X;
 476         }
 477
 478         /* If we've dropped down to 1X, disable fast writes. */
 479         if (*bridge_agpstat & AGPSTAT2_1X)
 480                 *bridge_agpstat &= ~AGPSTAT_FW;
 481 }
 482
 483 /*
 484  * requested_mode = Mode requested by (typically) X.
 485  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 486  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 487  */
 488 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 489 {
 490         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 491         u32 tmp;
 492
 493         if (*requested_mode & AGP3_RESERVED_MASK) {
 494                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 495                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
 496                 *requested_mode &= ~AGP3_RESERVED_MASK;
 497         }
 498
 499         /* Check the speed bits make sense. */
 500         tmp = *requested_mode & 7;
 501         if (tmp == 0) {
 502                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 503                 *requested_mode |= AGPSTAT3_4X;
 504         }
 505         if (tmp >= 3) {
 506                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 507                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 508         }
 509
 510         /* ARQSZ - Set the value to the maximum one.
 511          * Don't allow the mode register to override values. */
 512         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 513                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 514
 515         /* Calibration cycle.
 516          * Don't allow the mode register to override values. */
 517         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 518                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 519
 520         /* SBA *must* be supported for AGP v3 */
 521         *bridge_agpstat |= AGPSTAT_SBA;
 522
 523         /*
 524          * Set speed.
 525          * Check for invalid speeds. This can happen when applications
 526          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 527          */
 528         if (*requested_mode & AGPSTAT_MODE_3_0) {
 529                 /*
 530                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 531                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 532                  * AGP2.x 4x -> AGP3.0 4x.
 533                  */
 534                 if (*requested_mode & AGPSTAT2_4X) {
 535                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 536                                                 current->comm, *requested_mode);
 537                         *requested_mode &= ~AGPSTAT2_4X;
 538                         *requested_mode |= AGPSTAT3_4X;
 539                 }
 540         } else {
 541                 /*
 542                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 543                  * but have been passed an AGP 2.x mode.
 544                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 545                  */
 546                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 547                                         current->comm, *requested_mode);
 548                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 549                 *requested_mode |= AGPSTAT3_4X;
 550         }
 551
 552         if (*requested_mode & AGPSTAT3_8X) {
 553                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 554                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 555                         *bridge_agpstat |= AGPSTAT3_4X;
 556                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
 557                         return;
 558                 }
 559                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 560                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 561                         *bridge_agpstat |= AGPSTAT3_4X;
 562                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
 563                         return;
 564                 }
 565                 /* All set, bridge & device can do AGP x8*/
 566                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 567                 goto done;
 568
 569         } else {
 570
 571                 /*
 572                  * If we didn't specify AGPx8, we can only do x4.
 573                  * If the hardware can't do x4, we're up shit creek, and never
 574                  *  should have got this far.
 575                  */
 576                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 577                 if ((*bridge_agpstat & AGPSTAT3_4X) && (*vga_agpstat & AGPSTAT3_4X))
 578                         *bridge_agpstat |= AGPSTAT3_4X;
 579                 else {
 580                         printk(KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
 581                                                         "[bridge_agpstat:%x vga_agpstat:%x fell back to:- bridge_agpstat:%x vga_agpstat:%x]\n",
 582                                                         origbridge, origvga, *bridge_agpstat, *vga_agpstat);
 583                         if (!(*bridge_agpstat & AGPSTAT3_4X))
 584                                 printk(KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
 585                         if (!(*vga_agpstat & AGPSTAT3_4X))
 586                                 printk(KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
 587                         return;
 588                 }
 589         }
 590
 591 done:
 592         /* Apply any errata. */
 593         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 594                 *bridge_agpstat &= ~AGPSTAT_FW;
 595
 596         if (agp_bridge->flags & AGP_ERRATA_SBA)
 597                 *bridge_agpstat &= ~AGPSTAT_SBA;
 598
 599         if (agp_bridge->flags & AGP_ERRATA_1X) {
 600                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 601                 *bridge_agpstat |= AGPSTAT2_1X;
 602         }
 603 }
 604
 605
 606 /**
 607  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 608  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 609  * @requested_mode: requested agp_stat from userspace (Typically from X)
 610  * @bridge_agpstat: current agp_stat from AGP bridge.
 611  *
 612  * This function will hunt for an AGP graphics card, and try to match
 613  * the requested mode to the capabilities of both the bridge and the card.
 614  */
 615 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 616 {
 617         struct pci_dev *device = NULL;
 618         u32 vga_agpstat;
 619         u8 cap_ptr;
 620
 621         for (;;) {
 622                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 623                 if (!device) {
 624                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 625                         return 0;
 626                 }
 627                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 628                 if (cap_ptr)
 629                         break;
 630         }
 631
 632         /*
 633          * Ok, here we have a AGP device. Disable impossible
 634          * settings, and adjust the readqueue to the minimum.
 635          */
 636         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 637
 638         /* adjust RQ depth */
 639         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 640              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 641                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 642
 643         /* disable FW if it's not supported */
 644         if (!((bridge_agpstat & AGPSTAT_FW) &&
 645                  (vga_agpstat & AGPSTAT_FW) &&
 646                  (requested_mode & AGPSTAT_FW)))
 647                 bridge_agpstat &= ~AGPSTAT_FW;
 648
 649         /* Check to see if we are operating in 3.0 mode */
 650         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 651                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 652         else
 653                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 654
 655         pci_dev_put(device);
 656         return bridge_agpstat;
 657 }
 658 EXPORT_SYMBOL(agp_collect_device_status);
 659
 660
 661 void agp_device_command(u32 bridge_agpstat, int agp_v3)
 662 {
 663         struct pci_dev *device = NULL;
 664         int mode;
 665
 666         mode = bridge_agpstat & 0x7;
 667         if (agp_v3)
 668                 mode *= 4;
 669
 670         for_each_pci_dev(device) {
 671                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 672                 if (!agp)
 673                         continue;
 674
 675                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
 676                                 agp_v3 ? 3 : 2, pci_name(device), mode);
 677                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 678         }
 679 }
 680 EXPORT_SYMBOL(agp_device_command);
 681
 682
 683 void get_agp_version(struct agp_bridge_data *bridge)
 684 {
 685         u32 ncapid;
 686
 687         /* Exit early if already set by errata workarounds. */
 688         if (bridge->major_version != 0)
 689                 return;
 690
 691         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 692         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 693         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 694 }
 695 EXPORT_SYMBOL(get_agp_version);
 696
 697
 698 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 699 {
 700         u32 bridge_agpstat, temp;
 701
 702         get_agp_version(agp_bridge);
 703
 704         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
 705                                 agp_bridge->major_version,
 706                                 agp_bridge->minor_version,
 707                                 pci_name(agp_bridge->dev));
 708
 709         pci_read_config_dword(agp_bridge->dev,
 710                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 711
 712         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 713         if (bridge_agpstat == 0)
 714                 /* Something bad happened. FIXME: Return error code? */
 715                 return;
 716
 717         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 718
 719         /* Do AGP version specific frobbing. */
 720         if (bridge->major_version >= 3) {
 721                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 722                         /* If we have 3.5, we can do the isoch stuff. */
 723                         if (bridge->minor_version >= 5)
 724                                 agp_3_5_enable(bridge);
 725                         agp_device_command(bridge_agpstat, TRUE);
 726                         return;
 727                 } else {
 728                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 729                     bridge_agpstat &= ~(7<<10) ;
 730                     pci_read_config_dword(bridge->dev,
 731                                         bridge->capndx+AGPCTRL, &temp);
 732                     temp |= (1<<9);
 733                     pci_write_config_dword(bridge->dev,
 734                                         bridge->capndx+AGPCTRL, temp);
 735
 736                     printk(KERN_INFO PFX "Device is in legacy mode,"
 737                                 " falling back to 2.x\n");
 738                 }
 739         }
 740
 741         /* AGP v<3 */
 742         agp_device_command(bridge_agpstat, FALSE);
 743 }
 744 EXPORT_SYMBOL(agp_generic_enable);
 745
 746
 747 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 748 {
 749         char *table;
 750         char *table_end;
 751         int size;
 752         int page_order;
 753         int num_entries;
 754         int i;
 755         void *temp;
 756         struct page *page;
 757
 758         /* The generic routines can't handle 2 level gatt's */
 759         if (bridge->driver->size_type == LVL2_APER_SIZE)
 760                 return -EINVAL;
 761
 762         table = NULL;
 763         i = bridge->aperture_size_idx;
 764         temp = bridge->current_size;
 765         size = page_order = num_entries = 0;
 766
 767         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 768                 do {
 769                         switch (bridge->driver->size_type) {
 770                         case U8_APER_SIZE:
 771                                 size = A_SIZE_8(temp)->size;
 772                                 page_order =
 773                                     A_SIZE_8(temp)->page_order;
 774                                 num_entries =
 775                                     A_SIZE_8(temp)->num_entries;
 776                                 break;
 777                         case U16_APER_SIZE:
 778                                 size = A_SIZE_16(temp)->size;
 779                                 page_order = A_SIZE_16(temp)->page_order;
 780                                 num_entries = A_SIZE_16(temp)->num_entries;
 781                                 break;
 782                         case U32_APER_SIZE:
 783                                 size = A_SIZE_32(temp)->size;
 784                                 page_order = A_SIZE_32(temp)->page_order;
 785                                 num_entries = A_SIZE_32(temp)->num_entries;
 786                                 break;
 787                                 /* This case will never really happen. */
 788                         case FIXED_APER_SIZE:
 789                         case LVL2_APER_SIZE:
 790                         default:
 791                                 size = page_order = num_entries = 0;
 792                                 break;
 793                         }
 794
 795                         table = alloc_gatt_pages(page_order);
 796
 797                         if (table == NULL) {
 798                                 i++;
 799                                 switch (bridge->driver->size_type) {
 800                                 case U8_APER_SIZE:
 801                                         bridge->current_size = A_IDX8(bridge);
 802                                         break;
 803                                 case U16_APER_SIZE:
 804                                         bridge->current_size = A_IDX16(bridge);
 805                                         break;
 806                                 case U32_APER_SIZE:
 807                                         bridge->current_size = A_IDX32(bridge);
 808                                         break;
 809                                         /* This case will never really happen. */
 810                                 case FIXED_APER_SIZE:
 811                                 case LVL2_APER_SIZE:
 812                                 default:
 813                                         bridge->current_size =
 814                                             bridge->current_size;
 815                                         break;
 816                                 }
 817                                 temp = bridge->current_size;
 818                         } else {
 819                                 bridge->aperture_size_idx = i;
 820                         }
 821                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 822         } else {
 823                 size = ((struct aper_size_info_fixed *) temp)->size;
 824                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 825                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 826                 table = alloc_gatt_pages(page_order);
 827         }
 828
 829         if (table == NULL)
 830                 return -ENOMEM;
 831
 832         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 833
 834         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 835                 SetPageReserved(page);
 836
 837         bridge->gatt_table_real = (u32 *) table;
 838         agp_gatt_table = (void *)table;
 839
 840         bridge->driver->cache_flush();
 841         bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
 842                                         (PAGE_SIZE * (1 << page_order)));
 843         bridge->driver->cache_flush();
 844
 845         if (bridge->gatt_table == NULL) {
 846                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 847                         ClearPageReserved(page);
 848
 849                 free_gatt_pages(table, page_order);
 850
 851                 return -ENOMEM;
 852         }
 853         bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
 854
 855         /* AK: bogus, should encode addresses > 4GB */
 856         for (i = 0; i < num_entries; i++) {
 857                 writel(bridge->scratch_page, bridge->gatt_table+i);
 858                 readl(bridge->gatt_table+i);    /* PCI Posting. */
 859         }
 860
 861         return 0;
 862 }
 863 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 864
 865 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
 866 {
 867         int page_order;
 868         char *table, *table_end;
 869         void *temp;
 870         struct page *page;
 871
 872         temp = bridge->current_size;
 873
 874         switch (bridge->driver->size_type) {
 875         case U8_APER_SIZE:
 876                 page_order = A_SIZE_8(temp)->page_order;
 877                 break;
 878         case U16_APER_SIZE:
 879                 page_order = A_SIZE_16(temp)->page_order;
 880                 break;
 881         case U32_APER_SIZE:
 882                 page_order = A_SIZE_32(temp)->page_order;
 883                 break;
 884         case FIXED_APER_SIZE:
 885                 page_order = A_SIZE_FIX(temp)->page_order;
 886                 break;
 887         case LVL2_APER_SIZE:
 888                 /* The generic routines can't deal with 2 level gatt's */
 889                 return -EINVAL;
 890                 break;
 891         default:
 892                 page_order = 0;
 893                 break;
 894         }
 895
 896         /* Do not worry about freeing memory, because if this is
 897          * called, then all agp memory is deallocated and removed
 898          * from the table. */
 899
 900         iounmap(bridge->gatt_table);
 901         table = (char *) bridge->gatt_table_real;
 902         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 903
 904         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 905                 ClearPageReserved(page);
 906
 907         free_gatt_pages(bridge->gatt_table_real, page_order);
 908
 909         agp_gatt_table = NULL;
 910         bridge->gatt_table = NULL;
 911         bridge->gatt_table_real = NULL;
 912         bridge->gatt_bus_addr = 0;
 913
 914         return 0;
 915 }
 916 EXPORT_SYMBOL(agp_generic_free_gatt_table);
 917
 918
 919 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
 920 {
 921         int num_entries;
 922         size_t i;
 923         off_t j;
 924         void *temp;
 925         struct agp_bridge_data *bridge;
 926
 927         bridge = mem->bridge;
 928         if (!bridge)
 929                 return -EINVAL;
 930
 931         temp = bridge->current_size;
 932
 933         switch (bridge->driver->size_type) {
 934         case U8_APER_SIZE:
 935                 num_entries = A_SIZE_8(temp)->num_entries;
 936                 break;
 937         case U16_APER_SIZE:
 938                 num_entries = A_SIZE_16(temp)->num_entries;
 939                 break;
 940         case U32_APER_SIZE:
 941                 num_entries = A_SIZE_32(temp)->num_entries;
 942                 break;
 943         case FIXED_APER_SIZE:
 944                 num_entries = A_SIZE_FIX(temp)->num_entries;
 945                 break;
 946         case LVL2_APER_SIZE:
 947                 /* The generic routines can't deal with 2 level gatt's */
 948                 return -EINVAL;
 949                 break;
 950         default:
 951                 num_entries = 0;
 952                 break;
 953         }
 954
 955         num_entries -= agp_memory_reserved/PAGE_SIZE;
 956         if (num_entries < 0) num_entries = 0;
 957
 958         if (type != 0 || mem->type != 0) {
 959                 /* The generic routines know nothing of memory types */
 960                 return -EINVAL;
 961         }
 962
 963         /* AK: could wrap */
 964         if ((pg_start + mem->page_count) > num_entries)
 965                 return -EINVAL;
 966
 967         j = pg_start;
 968
 969         while (j < (pg_start + mem->page_count)) {
 970                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
 971                         return -EBUSY;
 972                 j++;
 973         }
 974
 975         if (mem->is_flushed == FALSE) {
 976                 bridge->driver->cache_flush();
 977                 mem->is_flushed = TRUE;
 978         }
 979
 980         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 981                 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mem->type), bridge->gatt_table+j);
 982                 readl(bridge->gatt_table+j);    /* PCI Posting. */
 983         }
 984
 985         bridge->driver->tlb_flush(mem);
 986         return 0;
 987 }
 988 EXPORT_SYMBOL(agp_generic_insert_memory);
 989
 990
 991 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 992 {
 993         size_t i;
 994         struct agp_bridge_data *bridge;
 995
 996         bridge = mem->bridge;
 997         if (!bridge)
 998                 return -EINVAL;
 999
1000         if (type != 0 || mem->type != 0) {
1001                 /* The generic routines know nothing of memory types */
1002                 return -EINVAL;
1003         }
1004
1005         /* AK: bogus, should encode addresses > 4GB */
1006         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1007                 writel(bridge->scratch_page, bridge->gatt_table+i);
1008                 readl(bridge->gatt_table+i);    /* PCI Posting. */
1009         }
1010
1011         global_cache_flush();
1012         bridge->driver->tlb_flush(mem);
1013         return 0;
1014 }
1015 EXPORT_SYMBOL(agp_generic_remove_memory);
1016
1017
1018 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1019 {
1020         return NULL;
1021 }
1022 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1023
1024
1025 void agp_generic_free_by_type(struct agp_memory *curr)
1026 {
1027         vfree(curr->memory);
1028         agp_free_key(curr->key);
1029         kfree(curr);
1030 }
1031 EXPORT_SYMBOL(agp_generic_free_by_type);
1032
1033
1034 /*
1035  * Basic Page Allocation Routines -
1036  * These routines handle page allocation and by default they reserve the allocated
1037  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1038  * against a maximum value.
1039  */
1040
1041 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1042 {
1043         struct page * page;
1044
1045         page = alloc_page(GFP_KERNEL);
1046         if (page == NULL)
1047                 return NULL;
1048
1049         map_page_into_agp(page);
1050
1051         get_page(page);
1052         SetPageLocked(page);
1053         atomic_inc(&agp_bridge->current_memory_agp);
1054         return page_address(page);
1055 }
1056 EXPORT_SYMBOL(agp_generic_alloc_page);
1057
1058
1059 void agp_generic_destroy_page(void *addr)
1060 {
1061         struct page *page;
1062
1063         if (addr == NULL)
1064                 return;
1065
1066         page = virt_to_page(addr);
1067         unmap_page_from_agp(page);
1068         put_page(page);
1069         unlock_page(page);
1070         free_page((unsigned long)addr);
1071         atomic_dec(&agp_bridge->current_memory_agp);
1072 }
1073 EXPORT_SYMBOL(agp_generic_destroy_page);
1074
1075 /* End Basic Page Allocation Routines */
1076
1077
1078 /**
1079  * agp_enable  -  initialise the agp point-to-point connection.
1080  *
1081  * @mode:       agp mode register value to configure with.
1082  */
1083 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1084 {
1085         if (!bridge)
1086                 return;
1087         bridge->driver->agp_enable(bridge, mode);
1088 }
1089 EXPORT_SYMBOL(agp_enable);
1090
1091 /* When we remove the global variable agp_bridge from all drivers
1092  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1093  */
1094
1095 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1096 {
1097         if (list_empty(&agp_bridges))
1098                 return NULL;
1099
1100         return agp_bridge;
1101 }
1102
1103 static void ipi_handler(void *null)
1104 {
1105         flush_agp_cache();
1106 }
1107
1108 void global_cache_flush(void)
1109 {
1110         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1111                 panic(PFX "timed out waiting for the other CPUs!\n");
1112 }
1113 EXPORT_SYMBOL(global_cache_flush);
1114
1115 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1116         unsigned long addr, int type)
1117 {
1118         /* memory type is ignored in the generic routine */
1119         if (bridge->driver->masks)
1120                 return addr | bridge->driver->masks[0].mask;
1121         else
1122                 return addr;
1123 }
1124 EXPORT_SYMBOL(agp_generic_mask_memory);
1125
1126 /*
1127  * These functions are implemented according to the AGPv3 spec,
1128  * which covers implementation details that had previously been
1129  * left open.
1130  */
1131
1132 int agp3_generic_fetch_size(void)
1133 {
1134         u16 temp_size;
1135         int i;
1136         struct aper_size_info_16 *values;
1137
1138         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1139         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1140
1141         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1142                 if (temp_size == values[i].size_value) {
1143                         agp_bridge->previous_size =
1144                                 agp_bridge->current_size = (void *) (values + i);
1145
1146                         agp_bridge->aperture_size_idx = i;
1147                         return values[i].size;
1148                 }
1149         }
1150         return 0;
1151 }
1152 EXPORT_SYMBOL(agp3_generic_fetch_size);
1153
1154 void agp3_generic_tlbflush(struct agp_memory *mem)
1155 {
1156         u32 ctrl;
1157         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1158         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1159         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1160 }
1161 EXPORT_SYMBOL(agp3_generic_tlbflush);
1162
1163 int agp3_generic_configure(void)
1164 {
1165         u32 temp;
1166         struct aper_size_info_16 *current_size;
1167
1168         current_size = A_SIZE_16(agp_bridge->current_size);
1169
1170         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1171         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1172
1173         /* set aperture size */
1174         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1175         /* set gart pointer */
1176         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1177         /* enable aperture and GTLB */
1178         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1179         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1180         return 0;
1181 }
1182 EXPORT_SYMBOL(agp3_generic_configure);
1183
1184 void agp3_generic_cleanup(void)
1185 {
1186         u32 ctrl;
1187         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1188         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1189 }
1190 EXPORT_SYMBOL(agp3_generic_cleanup);
1191
1192 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1193 {
1194         {4096, 1048576, 10,0x000},
1195         {2048,  524288, 9, 0x800},
1196         {1024,  262144, 8, 0xc00},
1197         { 512,  131072, 7, 0xe00},
1198         { 256,   65536, 6, 0xf00},
1199         { 128,   32768, 5, 0xf20},
1200         {  64,   16384, 4, 0xf30},
1201         {  32,    8192, 3, 0xf38},
1202         {  16,    4096, 2, 0xf3c},
1203         {   8,    2048, 1, 0xf3e},
1204         {   4,    1024, 0, 0xf3f}
1205 };
1206 EXPORT_SYMBOL(agp3_generic_sizes);
1207