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