drivers/char/agp/generic.c

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This source file includes following definitions.
agp_free_key
agp_get_key
agp_alloc_page_array
agp_create_user_memory
agp_create_memory
agp_free_memory
agp_allocate_memory
agp_return_size
agp_num_entries
agp_copy_info
agp_bind_memory
agp_unbind_memory
agp_v2_parse_one
agp_v3_parse_one
agp_collect_device_status
agp_device_command
get_agp_version
agp_generic_enable
agp_generic_create_gatt_table
agp_generic_free_gatt_table
agp_generic_insert_memory
agp_generic_remove_memory
agp_generic_alloc_by_type
agp_generic_free_by_type
agp_generic_alloc_user
agp_generic_alloc_pages
agp_generic_alloc_page
agp_generic_destroy_pages
agp_generic_destroy_page
agp_enable
agp_generic_find_bridge
ipi_handler
global_cache_flush
agp_generic_mask_memory
agp_generic_type_to_mask_type
agp3_generic_fetch_size
agp3_generic_tlbflush
agp3_generic_configure
agp3_generic_cleanup
   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/pagemap.h>
  33 #include <linux/miscdevice.h>
  34 #include <linux/pm.h>
  35 #include <linux/agp_backend.h>
  36 #include <linux/vmalloc.h>
  37 #include <linux/dma-mapping.h>
  38 #include <linux/mm.h>
  39 #include <linux/sched.h>
  40 #include <linux/slab.h>
  41 #include <asm/io.h>
  42 #ifdef CONFIG_X86
  43 #include <asm/set_memory.h>
  44 #endif
  45 #include <asm/pgtable.h>
  46 #include "agp.h"
  47 
  48 __u32 *agp_gatt_table;
  49 int agp_memory_reserved;
  50 
  51 /*
  52  * Needed by the Nforce GART driver for the time being. Would be
  53  * nice to do this some other way instead of needing this export.
  54  */
  55 EXPORT_SYMBOL_GPL(agp_memory_reserved);
  56 
  57 /*
  58  * Generic routines for handling agp_memory structures -
  59  * They use the basic page allocation routines to do the brunt of the work.
  60  */
  61 
  62 void agp_free_key(int key)
  63 {
  64         if (key < 0)
  65                 return;
  66 
  67         if (key < MAXKEY)
  68                 clear_bit(key, agp_bridge->key_list);
  69 }
  70 EXPORT_SYMBOL(agp_free_key);
  71 
  72 
  73 static int agp_get_key(void)
  74 {
  75         int bit;
  76 
  77         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  78         if (bit < MAXKEY) {
  79                 set_bit(bit, agp_bridge->key_list);
  80                 return bit;
  81         }
  82         return -1;
  83 }
  84 
  85 /*
  86  * Use kmalloc if possible for the page list. Otherwise fall back to
  87  * vmalloc. This speeds things up and also saves memory for small AGP
  88  * regions.
  89  */
  90 
  91 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
  92 {
  93         mem->pages = kvmalloc(size, GFP_KERNEL);
  94 }
  95 EXPORT_SYMBOL(agp_alloc_page_array);
  96 
  97 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
  98 {
  99         struct agp_memory *new;
 100         unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
 101 
 102         if (INT_MAX/sizeof(struct page *) < num_agp_pages)
 103                 return NULL;
 104 
 105         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 106         if (new == NULL)
 107                 return NULL;
 108 
 109         new->key = agp_get_key();
 110 
 111         if (new->key < 0) {
 112                 kfree(new);
 113                 return NULL;
 114         }
 115 
 116         agp_alloc_page_array(alloc_size, new);
 117 
 118         if (new->pages == NULL) {
 119                 agp_free_key(new->key);
 120                 kfree(new);
 121                 return NULL;
 122         }
 123         new->num_scratch_pages = 0;
 124         return new;
 125 }
 126 
 127 struct agp_memory *agp_create_memory(int scratch_pages)
 128 {
 129         struct agp_memory *new;
 130 
 131         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 132         if (new == NULL)
 133                 return NULL;
 134 
 135         new->key = agp_get_key();
 136 
 137         if (new->key < 0) {
 138                 kfree(new);
 139                 return NULL;
 140         }
 141 
 142         agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
 143 
 144         if (new->pages == NULL) {
 145                 agp_free_key(new->key);
 146                 kfree(new);
 147                 return NULL;
 148         }
 149         new->num_scratch_pages = scratch_pages;
 150         new->type = AGP_NORMAL_MEMORY;
 151         return new;
 152 }
 153 EXPORT_SYMBOL(agp_create_memory);
 154 
 155 /**
 156  *      agp_free_memory - free memory associated with an agp_memory pointer.
 157  *
 158  *      @curr:          agp_memory pointer to be freed.
 159  *
 160  *      It is the only function that can be called when the backend is not owned
 161  *      by the caller.  (So it can free memory on client death.)
 162  */
 163 void agp_free_memory(struct agp_memory *curr)
 164 {
 165         size_t i;
 166 
 167         if (curr == NULL)
 168                 return;
 169 
 170         if (curr->is_bound)
 171                 agp_unbind_memory(curr);
 172 
 173         if (curr->type >= AGP_USER_TYPES) {
 174                 agp_generic_free_by_type(curr);
 175                 return;
 176         }
 177 
 178         if (curr->type != 0) {
 179                 curr->bridge->driver->free_by_type(curr);
 180                 return;
 181         }
 182         if (curr->page_count != 0) {
 183                 if (curr->bridge->driver->agp_destroy_pages) {
 184                         curr->bridge->driver->agp_destroy_pages(curr);
 185                 } else {
 186 
 187                         for (i = 0; i < curr->page_count; i++) {
 188                                 curr->bridge->driver->agp_destroy_page(
 189                                         curr->pages[i],
 190                                         AGP_PAGE_DESTROY_UNMAP);
 191                         }
 192                         for (i = 0; i < curr->page_count; i++) {
 193                                 curr->bridge->driver->agp_destroy_page(
 194                                         curr->pages[i],
 195                                         AGP_PAGE_DESTROY_FREE);
 196                         }
 197                 }
 198         }
 199         agp_free_key(curr->key);
 200         agp_free_page_array(curr);
 201         kfree(curr);
 202 }
 203 EXPORT_SYMBOL(agp_free_memory);
 204 
 205 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 206 
 207 /**
 208  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 209  *
 210  *      @page_count:    size_t argument of the number of pages
 211  *      @type:  u32 argument of the type of memory to be allocated.
 212  *
 213  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 214  *      maps to physical ram.  Any other type is device dependent.
 215  *
 216  *      It returns NULL whenever memory is unavailable.
 217  */
 218 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 219                                         size_t page_count, u32 type)
 220 {
 221         int scratch_pages;
 222         struct agp_memory *new;
 223         size_t i;
 224         int cur_memory;
 225 
 226         if (!bridge)
 227                 return NULL;
 228 
 229         cur_memory = atomic_read(&bridge->current_memory_agp);
 230         if ((cur_memory + page_count > bridge->max_memory_agp) ||
 231             (cur_memory + page_count < page_count))
 232                 return NULL;
 233 
 234         if (type >= AGP_USER_TYPES) {
 235                 new = agp_generic_alloc_user(page_count, type);
 236                 if (new)
 237                         new->bridge = bridge;
 238                 return new;
 239         }
 240 
 241         if (type != 0) {
 242                 new = bridge->driver->alloc_by_type(page_count, type);
 243                 if (new)
 244                         new->bridge = bridge;
 245                 return new;
 246         }
 247 
 248         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 249 
 250         new = agp_create_memory(scratch_pages);
 251 
 252         if (new == NULL)
 253                 return NULL;
 254 
 255         if (bridge->driver->agp_alloc_pages) {
 256                 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
 257                         agp_free_memory(new);
 258                         return NULL;
 259                 }
 260                 new->bridge = bridge;
 261                 return new;
 262         }
 263 
 264         for (i = 0; i < page_count; i++) {
 265                 struct page *page = bridge->driver->agp_alloc_page(bridge);
 266 
 267                 if (page == NULL) {
 268                         agp_free_memory(new);
 269                         return NULL;
 270                 }
 271                 new->pages[i] = page;
 272                 new->page_count++;
 273         }
 274         new->bridge = bridge;
 275 
 276         return new;
 277 }
 278 EXPORT_SYMBOL(agp_allocate_memory);
 279 
 280 
 281 /* End - Generic routines for handling agp_memory structures */
 282 
 283 
 284 static int agp_return_size(void)
 285 {
 286         int current_size;
 287         void *temp;
 288 
 289         temp = agp_bridge->current_size;
 290 
 291         switch (agp_bridge->driver->size_type) {
 292         case U8_APER_SIZE:
 293                 current_size = A_SIZE_8(temp)->size;
 294                 break;
 295         case U16_APER_SIZE:
 296                 current_size = A_SIZE_16(temp)->size;
 297                 break;
 298         case U32_APER_SIZE:
 299                 current_size = A_SIZE_32(temp)->size;
 300                 break;
 301         case LVL2_APER_SIZE:
 302                 current_size = A_SIZE_LVL2(temp)->size;
 303                 break;
 304         case FIXED_APER_SIZE:
 305                 current_size = A_SIZE_FIX(temp)->size;
 306                 break;
 307         default:
 308                 current_size = 0;
 309                 break;
 310         }
 311 
 312         current_size -= (agp_memory_reserved / (1024*1024));
 313         if (current_size <0)
 314                 current_size = 0;
 315         return current_size;
 316 }
 317 
 318 
 319 int agp_num_entries(void)
 320 {
 321         int num_entries;
 322         void *temp;
 323 
 324         temp = agp_bridge->current_size;
 325 
 326         switch (agp_bridge->driver->size_type) {
 327         case U8_APER_SIZE:
 328                 num_entries = A_SIZE_8(temp)->num_entries;
 329                 break;
 330         case U16_APER_SIZE:
 331                 num_entries = A_SIZE_16(temp)->num_entries;
 332                 break;
 333         case U32_APER_SIZE:
 334                 num_entries = A_SIZE_32(temp)->num_entries;
 335                 break;
 336         case LVL2_APER_SIZE:
 337                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 338                 break;
 339         case FIXED_APER_SIZE:
 340                 num_entries = A_SIZE_FIX(temp)->num_entries;
 341                 break;
 342         default:
 343                 num_entries = 0;
 344                 break;
 345         }
 346 
 347         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 348         if (num_entries<0)
 349                 num_entries = 0;
 350         return num_entries;
 351 }
 352 EXPORT_SYMBOL_GPL(agp_num_entries);
 353 
 354 
 355 /**
 356  *      agp_copy_info  -  copy bridge state information
 357  *
 358  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 359  *
 360  *      This function copies information about the agp bridge device and the state of
 361  *      the agp backend into an agp_kern_info pointer.
 362  */
 363 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 364 {
 365         memset(info, 0, sizeof(struct agp_kern_info));
 366         if (!bridge) {
 367                 info->chipset = NOT_SUPPORTED;
 368                 return -EIO;
 369         }
 370 
 371         info->version.major = bridge->version->major;
 372         info->version.minor = bridge->version->minor;
 373         info->chipset = SUPPORTED;
 374         info->device = bridge->dev;
 375         if (bridge->mode & AGPSTAT_MODE_3_0)
 376                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 377         else
 378                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 379         info->aper_base = bridge->gart_bus_addr;
 380         info->aper_size = agp_return_size();
 381         info->max_memory = bridge->max_memory_agp;
 382         info->current_memory = atomic_read(&bridge->current_memory_agp);
 383         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 384         info->vm_ops = bridge->vm_ops;
 385         info->page_mask = ~0UL;
 386         return 0;
 387 }
 388 EXPORT_SYMBOL(agp_copy_info);
 389 
 390 /* End - Routine to copy over information structure */
 391 
 392 /*
 393  * Routines for handling swapping of agp_memory into the GATT -
 394  * These routines take agp_memory and insert them into the GATT.
 395  * They call device specific routines to actually write to the GATT.
 396  */
 397 
 398 /**
 399  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 400  *
 401  *      @curr:          agp_memory pointer
 402  *      @pg_start:      an offset into the graphics aperture translation table
 403  *
 404  *      It returns -EINVAL if the pointer == NULL.
 405  *      It returns -EBUSY if the area of the table requested is already in use.
 406  */
 407 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 408 {
 409         int ret_val;
 410 
 411         if (curr == NULL)
 412                 return -EINVAL;
 413 
 414         if (curr->is_bound) {
 415                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
 416                 return -EINVAL;
 417         }
 418         if (!curr->is_flushed) {
 419                 curr->bridge->driver->cache_flush();
 420                 curr->is_flushed = true;
 421         }
 422 
 423         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 424 
 425         if (ret_val != 0)
 426                 return ret_val;
 427 
 428         curr->is_bound = true;
 429         curr->pg_start = pg_start;
 430         spin_lock(&agp_bridge->mapped_lock);
 431         list_add(&curr->mapped_list, &agp_bridge->mapped_list);
 432         spin_unlock(&agp_bridge->mapped_lock);
 433 
 434         return 0;
 435 }
 436 EXPORT_SYMBOL(agp_bind_memory);
 437 
 438 
 439 /**
 440  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 441  *
 442  * @curr:       agp_memory pointer to be removed from the GATT.
 443  *
 444  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 445  * the graphics aperture translation table or if the agp_memory pointer == NULL
 446  */
 447 int agp_unbind_memory(struct agp_memory *curr)
 448 {
 449         int ret_val;
 450 
 451         if (curr == NULL)
 452                 return -EINVAL;
 453 
 454         if (!curr->is_bound) {
 455                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
 456                 return -EINVAL;
 457         }
 458 
 459         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 460 
 461         if (ret_val != 0)
 462                 return ret_val;
 463 
 464         curr->is_bound = false;
 465         curr->pg_start = 0;
 466         spin_lock(&curr->bridge->mapped_lock);
 467         list_del(&curr->mapped_list);
 468         spin_unlock(&curr->bridge->mapped_lock);
 469         return 0;
 470 }
 471 EXPORT_SYMBOL(agp_unbind_memory);
 472 
 473 
 474 /* End - Routines for handling swapping of agp_memory into the GATT */
 475 
 476 
 477 /* Generic Agp routines - Start */
 478 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 479 {
 480         u32 tmp;
 481 
 482         if (*requested_mode & AGP2_RESERVED_MASK) {
 483                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 484                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
 485                 *requested_mode &= ~AGP2_RESERVED_MASK;
 486         }
 487 
 488         /*
 489          * Some dumb bridges are programmed to disobey the AGP2 spec.
 490          * This is likely a BIOS misprogramming rather than poweron default, or
 491          * it would be a lot more common.
 492          * https://bugs.freedesktop.org/show_bug.cgi?id=8816
 493          * AGPv2 spec 6.1.9 states:
 494          *   The RATE field indicates the data transfer rates supported by this
 495          *   device. A.G.P. devices must report all that apply.
 496          * Fix them up as best we can.
 497          */
 498         switch (*bridge_agpstat & 7) {
 499         case 4:
 500                 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
 501                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate. "
 502                         "Fixing up support for x2 & x1\n");
 503                 break;
 504         case 2:
 505                 *bridge_agpstat |= AGPSTAT2_1X;
 506                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate. "
 507                         "Fixing up support for x1\n");
 508                 break;
 509         default:
 510                 break;
 511         }
 512 
 513         /* Check the speed bits make sense. Only one should be set. */
 514         tmp = *requested_mode & 7;
 515         switch (tmp) {
 516                 case 0:
 517                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 518                         *requested_mode |= AGPSTAT2_1X;
 519                         break;
 520                 case 1:
 521                 case 2:
 522                         break;
 523                 case 3:
 524                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 525                         break;
 526                 case 4:
 527                         break;
 528                 case 5:
 529                 case 6:
 530                 case 7:
 531                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 532                         break;
 533         }
 534 
 535         /* disable SBA if it's not supported */
 536         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 537                 *bridge_agpstat &= ~AGPSTAT_SBA;
 538 
 539         /* Set rate */
 540         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 541                 *bridge_agpstat &= ~AGPSTAT2_4X;
 542 
 543         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 544                 *bridge_agpstat &= ~AGPSTAT2_2X;
 545 
 546         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 547                 *bridge_agpstat &= ~AGPSTAT2_1X;
 548 
 549         /* Now we know what mode it should be, clear out the unwanted bits. */
 550         if (*bridge_agpstat & AGPSTAT2_4X)
 551                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 552 
 553         if (*bridge_agpstat & AGPSTAT2_2X)
 554                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 555 
 556         if (*bridge_agpstat & AGPSTAT2_1X)
 557                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 558 
 559         /* Apply any errata. */
 560         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 561                 *bridge_agpstat &= ~AGPSTAT_FW;
 562 
 563         if (agp_bridge->flags & AGP_ERRATA_SBA)
 564                 *bridge_agpstat &= ~AGPSTAT_SBA;
 565 
 566         if (agp_bridge->flags & AGP_ERRATA_1X) {
 567                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 568                 *bridge_agpstat |= AGPSTAT2_1X;
 569         }
 570 
 571         /* If we've dropped down to 1X, disable fast writes. */
 572         if (*bridge_agpstat & AGPSTAT2_1X)
 573                 *bridge_agpstat &= ~AGPSTAT_FW;
 574 }
 575 
 576 /*
 577  * requested_mode = Mode requested by (typically) X.
 578  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 579  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 580  */
 581 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 582 {
 583         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 584         u32 tmp;
 585 
 586         if (*requested_mode & AGP3_RESERVED_MASK) {
 587                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 588                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
 589                 *requested_mode &= ~AGP3_RESERVED_MASK;
 590         }
 591 
 592         /* Check the speed bits make sense. */
 593         tmp = *requested_mode & 7;
 594         if (tmp == 0) {
 595                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 596                 *requested_mode |= AGPSTAT3_4X;
 597         }
 598         if (tmp >= 3) {
 599                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 600                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 601         }
 602 
 603         /* ARQSZ - Set the value to the maximum one.
 604          * Don't allow the mode register to override values. */
 605         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 606                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 607 
 608         /* Calibration cycle.
 609          * Don't allow the mode register to override values. */
 610         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 611                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 612 
 613         /* SBA *must* be supported for AGP v3 */
 614         *bridge_agpstat |= AGPSTAT_SBA;
 615 
 616         /*
 617          * Set speed.
 618          * Check for invalid speeds. This can happen when applications
 619          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 620          */
 621         if (*requested_mode & AGPSTAT_MODE_3_0) {
 622                 /*
 623                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 624                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 625                  * AGP2.x 4x -> AGP3.0 4x.
 626                  */
 627                 if (*requested_mode & AGPSTAT2_4X) {
 628                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 629                                                 current->comm, *requested_mode);
 630                         *requested_mode &= ~AGPSTAT2_4X;
 631                         *requested_mode |= AGPSTAT3_4X;
 632                 }
 633         } else {
 634                 /*
 635                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 636                  * but have been passed an AGP 2.x mode.
 637                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 638                  */
 639                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 640                                         current->comm, *requested_mode);
 641                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 642                 *requested_mode |= AGPSTAT3_4X;
 643         }
 644 
 645         if (*requested_mode & AGPSTAT3_8X) {
 646                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 647                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 648                         *bridge_agpstat |= AGPSTAT3_4X;
 649                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
 650                         return;
 651                 }
 652                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 653                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 654                         *bridge_agpstat |= AGPSTAT3_4X;
 655                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
 656                         return;
 657                 }
 658                 /* All set, bridge & device can do AGP x8*/
 659                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 660                 goto done;
 661 
 662         } else if (*requested_mode & AGPSTAT3_4X) {
 663                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 664                 *bridge_agpstat |= AGPSTAT3_4X;
 665                 goto done;
 666 
 667         } else {
 668 
 669                 /*
 670                  * If we didn't specify an AGP mode, we see if both
 671                  * the graphics card, and the bridge can do x8, and use if so.
 672                  * If not, we fall back to x4 mode.
 673                  */
 674                 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
 675                         printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
 676                                 "supported by bridge & card (x8).\n");
 677                         *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 678                         *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 679                 } else {
 680                         printk(KERN_INFO PFX "Fell back to AGPx4 mode because ");
 681                         if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 682                                 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
 683                                         *bridge_agpstat, origbridge);
 684                                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 685                                 *bridge_agpstat |= AGPSTAT3_4X;
 686                         }
 687                         if (!(*vga_agpstat & AGPSTAT3_8X)) {
 688                                 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
 689                                         *vga_agpstat, origvga);
 690                                 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 691                                 *vga_agpstat |= AGPSTAT3_4X;
 692                         }
 693                 }
 694         }
 695 
 696 done:
 697         /* Apply any errata. */
 698         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 699                 *bridge_agpstat &= ~AGPSTAT_FW;
 700 
 701         if (agp_bridge->flags & AGP_ERRATA_SBA)
 702                 *bridge_agpstat &= ~AGPSTAT_SBA;
 703 
 704         if (agp_bridge->flags & AGP_ERRATA_1X) {
 705                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 706                 *bridge_agpstat |= AGPSTAT2_1X;
 707         }
 708 }
 709 
 710 
 711 /**
 712  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 713  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 714  * @requested_mode: requested agp_stat from userspace (Typically from X)
 715  * @bridge_agpstat: current agp_stat from AGP bridge.
 716  *
 717  * This function will hunt for an AGP graphics card, and try to match
 718  * the requested mode to the capabilities of both the bridge and the card.
 719  */
 720 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 721 {
 722         struct pci_dev *device = NULL;
 723         u32 vga_agpstat;
 724         u8 cap_ptr;
 725 
 726         for (;;) {
 727                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 728                 if (!device) {
 729                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 730                         return 0;
 731                 }
 732                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 733                 if (cap_ptr)
 734                         break;
 735         }
 736 
 737         /*
 738          * Ok, here we have a AGP device. Disable impossible
 739          * settings, and adjust the readqueue to the minimum.
 740          */
 741         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 742 
 743         /* adjust RQ depth */
 744         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 745              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 746                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 747 
 748         /* disable FW if it's not supported */
 749         if (!((bridge_agpstat & AGPSTAT_FW) &&
 750                  (vga_agpstat & AGPSTAT_FW) &&
 751                  (requested_mode & AGPSTAT_FW)))
 752                 bridge_agpstat &= ~AGPSTAT_FW;
 753 
 754         /* Check to see if we are operating in 3.0 mode */
 755         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 756                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 757         else
 758                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 759 
 760         pci_dev_put(device);
 761         return bridge_agpstat;
 762 }
 763 EXPORT_SYMBOL(agp_collect_device_status);
 764 
 765 
 766 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
 767 {
 768         struct pci_dev *device = NULL;
 769         int mode;
 770 
 771         mode = bridge_agpstat & 0x7;
 772         if (agp_v3)
 773                 mode *= 4;
 774 
 775         for_each_pci_dev(device) {
 776                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 777                 if (!agp)
 778                         continue;
 779 
 780                 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
 781                          agp_v3 ? 3 : 2, mode);
 782                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 783         }
 784 }
 785 EXPORT_SYMBOL(agp_device_command);
 786 
 787 
 788 void get_agp_version(struct agp_bridge_data *bridge)
 789 {
 790         u32 ncapid;
 791 
 792         /* Exit early if already set by errata workarounds. */
 793         if (bridge->major_version != 0)
 794                 return;
 795 
 796         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 797         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 798         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 799 }
 800 EXPORT_SYMBOL(get_agp_version);
 801 
 802 
 803 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 804 {
 805         u32 bridge_agpstat, temp;
 806 
 807         get_agp_version(agp_bridge);
 808 
 809         dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
 810                  agp_bridge->major_version, agp_bridge->minor_version);
 811 
 812         pci_read_config_dword(agp_bridge->dev,
 813                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 814 
 815         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 816         if (bridge_agpstat == 0)
 817                 /* Something bad happened. FIXME: Return error code? */
 818                 return;
 819 
 820         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 821 
 822         /* Do AGP version specific frobbing. */
 823         if (bridge->major_version >= 3) {
 824                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 825                         /* If we have 3.5, we can do the isoch stuff. */
 826                         if (bridge->minor_version >= 5)
 827                                 agp_3_5_enable(bridge);
 828                         agp_device_command(bridge_agpstat, true);
 829                         return;
 830                 } else {
 831                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 832                     bridge_agpstat &= ~(7<<10) ;
 833                     pci_read_config_dword(bridge->dev,
 834                                         bridge->capndx+AGPCTRL, &temp);
 835                     temp |= (1<<9);
 836                     pci_write_config_dword(bridge->dev,
 837                                         bridge->capndx+AGPCTRL, temp);
 838 
 839                     dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
 840                 }
 841         }
 842 
 843         /* AGP v<3 */
 844         agp_device_command(bridge_agpstat, false);
 845 }
 846 EXPORT_SYMBOL(agp_generic_enable);
 847 
 848 
 849 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 850 {
 851         char *table;
 852         char *table_end;
 853         int size;
 854         int page_order;
 855         int num_entries;
 856         int i;
 857         void *temp;
 858         struct page *page;
 859 
 860         /* The generic routines can't handle 2 level gatt's */
 861         if (bridge->driver->size_type == LVL2_APER_SIZE)
 862                 return -EINVAL;
 863 
 864         table = NULL;
 865         i = bridge->aperture_size_idx;
 866         temp = bridge->current_size;
 867         size = page_order = num_entries = 0;
 868 
 869         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 870                 do {
 871                         switch (bridge->driver->size_type) {
 872                         case U8_APER_SIZE:
 873                                 size = A_SIZE_8(temp)->size;
 874                                 page_order =
 875                                     A_SIZE_8(temp)->page_order;
 876                                 num_entries =
 877                                     A_SIZE_8(temp)->num_entries;
 878                                 break;
 879                         case U16_APER_SIZE:
 880                                 size = A_SIZE_16(temp)->size;
 881                                 page_order = A_SIZE_16(temp)->page_order;
 882                                 num_entries = A_SIZE_16(temp)->num_entries;
 883                                 break;
 884                         case U32_APER_SIZE:
 885                                 size = A_SIZE_32(temp)->size;
 886                                 page_order = A_SIZE_32(temp)->page_order;
 887                                 num_entries = A_SIZE_32(temp)->num_entries;
 888                                 break;
 889                                 /* This case will never really happen. */
 890                         case FIXED_APER_SIZE:
 891                         case LVL2_APER_SIZE:
 892                         default:
 893                                 size = page_order = num_entries = 0;
 894                                 break;
 895                         }
 896 
 897                         table = alloc_gatt_pages(page_order);
 898 
 899                         if (table == NULL) {
 900                                 i++;
 901                                 switch (bridge->driver->size_type) {
 902                                 case U8_APER_SIZE:
 903                                         bridge->current_size = A_IDX8(bridge);
 904                                         break;
 905                                 case U16_APER_SIZE:
 906                                         bridge->current_size = A_IDX16(bridge);
 907                                         break;
 908                                 case U32_APER_SIZE:
 909                                         bridge->current_size = A_IDX32(bridge);
 910                                         break;
 911                                 /* These cases will never really happen. */
 912                                 case FIXED_APER_SIZE:
 913                                 case LVL2_APER_SIZE:
 914                                 default:
 915                                         break;
 916                                 }
 917                                 temp = bridge->current_size;
 918                         } else {
 919                                 bridge->aperture_size_idx = i;
 920                         }
 921                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 922         } else {
 923                 size = ((struct aper_size_info_fixed *) temp)->size;
 924                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 925                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 926                 table = alloc_gatt_pages(page_order);
 927         }
 928 
 929         if (table == NULL)
 930                 return -ENOMEM;
 931 
 932         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 933 
 934         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 935                 SetPageReserved(page);
 936 
 937         bridge->gatt_table_real = (u32 *) table;
 938         agp_gatt_table = (void *)table;
 939 
 940         bridge->driver->cache_flush();
 941 #ifdef CONFIG_X86
 942         if (set_memory_uc((unsigned long)table, 1 << page_order))
 943                 printk(KERN_WARNING "Could not set GATT table memory to UC!\n");
 944 
 945         bridge->gatt_table = (u32 __iomem *)table;
 946 #else
 947         bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
 948                                         (PAGE_SIZE * (1 << page_order)));
 949         bridge->driver->cache_flush();
 950 #endif
 951 
 952         if (bridge->gatt_table == NULL) {
 953                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 954                         ClearPageReserved(page);
 955 
 956                 free_gatt_pages(table, page_order);
 957 
 958                 return -ENOMEM;
 959         }
 960         bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
 961 
 962         /* AK: bogus, should encode addresses > 4GB */
 963         for (i = 0; i < num_entries; i++) {
 964                 writel(bridge->scratch_page, bridge->gatt_table+i);
 965                 readl(bridge->gatt_table+i);    /* PCI Posting. */
 966         }
 967 
 968         return 0;
 969 }
 970 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 971 
 972 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
 973 {
 974         int page_order;
 975         char *table, *table_end;
 976         void *temp;
 977         struct page *page;
 978 
 979         temp = bridge->current_size;
 980 
 981         switch (bridge->driver->size_type) {
 982         case U8_APER_SIZE:
 983                 page_order = A_SIZE_8(temp)->page_order;
 984                 break;
 985         case U16_APER_SIZE:
 986                 page_order = A_SIZE_16(temp)->page_order;
 987                 break;
 988         case U32_APER_SIZE:
 989                 page_order = A_SIZE_32(temp)->page_order;
 990                 break;
 991         case FIXED_APER_SIZE:
 992                 page_order = A_SIZE_FIX(temp)->page_order;
 993                 break;
 994         case LVL2_APER_SIZE:
 995                 /* The generic routines can't deal with 2 level gatt's */
 996                 return -EINVAL;
 997         default:
 998                 page_order = 0;
 999                 break;
1000         }
1001 
1002         /* Do not worry about freeing memory, because if this is
1003          * called, then all agp memory is deallocated and removed
1004          * from the table. */
1005 
1006 #ifdef CONFIG_X86
1007         set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1008 #else
1009         iounmap(bridge->gatt_table);
1010 #endif
1011         table = (char *) bridge->gatt_table_real;
1012         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1013 
1014         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1015                 ClearPageReserved(page);
1016 
1017         free_gatt_pages(bridge->gatt_table_real, page_order);
1018 
1019         agp_gatt_table = NULL;
1020         bridge->gatt_table = NULL;
1021         bridge->gatt_table_real = NULL;
1022         bridge->gatt_bus_addr = 0;
1023 
1024         return 0;
1025 }
1026 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1027 
1028 
1029 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1030 {
1031         int num_entries;
1032         size_t i;
1033         off_t j;
1034         void *temp;
1035         struct agp_bridge_data *bridge;
1036         int mask_type;
1037 
1038         bridge = mem->bridge;
1039         if (!bridge)
1040                 return -EINVAL;
1041 
1042         if (mem->page_count == 0)
1043                 return 0;
1044 
1045         temp = bridge->current_size;
1046 
1047         switch (bridge->driver->size_type) {
1048         case U8_APER_SIZE:
1049                 num_entries = A_SIZE_8(temp)->num_entries;
1050                 break;
1051         case U16_APER_SIZE:
1052                 num_entries = A_SIZE_16(temp)->num_entries;
1053                 break;
1054         case U32_APER_SIZE:
1055                 num_entries = A_SIZE_32(temp)->num_entries;
1056                 break;
1057         case FIXED_APER_SIZE:
1058                 num_entries = A_SIZE_FIX(temp)->num_entries;
1059                 break;
1060         case LVL2_APER_SIZE:
1061                 /* The generic routines can't deal with 2 level gatt's */
1062                 return -EINVAL;
1063         default:
1064                 num_entries = 0;
1065                 break;
1066         }
1067 
1068         num_entries -= agp_memory_reserved/PAGE_SIZE;
1069         if (num_entries < 0) num_entries = 0;
1070 
1071         if (type != mem->type)
1072                 return -EINVAL;
1073 
1074         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1075         if (mask_type != 0) {
1076                 /* The generic routines know nothing of memory types */
1077                 return -EINVAL;
1078         }
1079 
1080         if (((pg_start + mem->page_count) > num_entries) ||
1081             ((pg_start + mem->page_count) < pg_start))
1082                 return -EINVAL;
1083 
1084         j = pg_start;
1085 
1086         while (j < (pg_start + mem->page_count)) {
1087                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1088                         return -EBUSY;
1089                 j++;
1090         }
1091 
1092         if (!mem->is_flushed) {
1093                 bridge->driver->cache_flush();
1094                 mem->is_flushed = true;
1095         }
1096 
1097         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1098                 writel(bridge->driver->mask_memory(bridge,
1099                                                    page_to_phys(mem->pages[i]),
1100                                                    mask_type),
1101                        bridge->gatt_table+j);
1102         }
1103         readl(bridge->gatt_table+j-1);  /* PCI Posting. */
1104 
1105         bridge->driver->tlb_flush(mem);
1106         return 0;
1107 }
1108 EXPORT_SYMBOL(agp_generic_insert_memory);
1109 
1110 
1111 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1112 {
1113         size_t i;
1114         struct agp_bridge_data *bridge;
1115         int mask_type, num_entries;
1116 
1117         bridge = mem->bridge;
1118         if (!bridge)
1119                 return -EINVAL;
1120 
1121         if (mem->page_count == 0)
1122                 return 0;
1123 
1124         if (type != mem->type)
1125                 return -EINVAL;
1126 
1127         num_entries = agp_num_entries();
1128         if (((pg_start + mem->page_count) > num_entries) ||
1129             ((pg_start + mem->page_count) < pg_start))
1130                 return -EINVAL;
1131 
1132         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1133         if (mask_type != 0) {
1134                 /* The generic routines know nothing of memory types */
1135                 return -EINVAL;
1136         }
1137 
1138         /* AK: bogus, should encode addresses > 4GB */
1139         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1140                 writel(bridge->scratch_page, bridge->gatt_table+i);
1141         }
1142         readl(bridge->gatt_table+i-1);  /* PCI Posting. */
1143 
1144         bridge->driver->tlb_flush(mem);
1145         return 0;
1146 }
1147 EXPORT_SYMBOL(agp_generic_remove_memory);
1148 
1149 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1150 {
1151         return NULL;
1152 }
1153 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1154 
1155 void agp_generic_free_by_type(struct agp_memory *curr)
1156 {
1157         agp_free_page_array(curr);
1158         agp_free_key(curr->key);
1159         kfree(curr);
1160 }
1161 EXPORT_SYMBOL(agp_generic_free_by_type);
1162 
1163 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1164 {
1165         struct agp_memory *new;
1166         int i;
1167         int pages;
1168 
1169         pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1170         new = agp_create_user_memory(page_count);
1171         if (new == NULL)
1172                 return NULL;
1173 
1174         for (i = 0; i < page_count; i++)
1175                 new->pages[i] = NULL;
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  * Basic Page Allocation Routines -
1186  * These routines handle page allocation and by default they reserve the allocated
1187  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1188  * against a maximum value.
1189  */
1190 
1191 int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1192 {
1193         struct page * page;
1194         int i, ret = -ENOMEM;
1195 
1196         for (i = 0; i < num_pages; i++) {
1197                 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1198                 /* agp_free_memory() needs gart address */
1199                 if (page == NULL)
1200                         goto out;
1201 
1202 #ifndef CONFIG_X86
1203                 map_page_into_agp(page);
1204 #endif
1205                 get_page(page);
1206                 atomic_inc(&agp_bridge->current_memory_agp);
1207 
1208                 mem->pages[i] = page;
1209                 mem->page_count++;
1210         }
1211 
1212 #ifdef CONFIG_X86
1213         set_pages_array_uc(mem->pages, num_pages);
1214 #endif
1215         ret = 0;
1216 out:
1217         return ret;
1218 }
1219 EXPORT_SYMBOL(agp_generic_alloc_pages);
1220 
1221 struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1222 {
1223         struct page * page;
1224 
1225         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1226         if (page == NULL)
1227                 return NULL;
1228 
1229         map_page_into_agp(page);
1230 
1231         get_page(page);
1232         atomic_inc(&agp_bridge->current_memory_agp);
1233         return page;
1234 }
1235 EXPORT_SYMBOL(agp_generic_alloc_page);
1236 
1237 void agp_generic_destroy_pages(struct agp_memory *mem)
1238 {
1239         int i;
1240         struct page *page;
1241 
1242         if (!mem)
1243                 return;
1244 
1245 #ifdef CONFIG_X86
1246         set_pages_array_wb(mem->pages, mem->page_count);
1247 #endif
1248 
1249         for (i = 0; i < mem->page_count; i++) {
1250                 page = mem->pages[i];
1251 
1252 #ifndef CONFIG_X86
1253                 unmap_page_from_agp(page);
1254 #endif
1255                 put_page(page);
1256                 __free_page(page);
1257                 atomic_dec(&agp_bridge->current_memory_agp);
1258                 mem->pages[i] = NULL;
1259         }
1260 }
1261 EXPORT_SYMBOL(agp_generic_destroy_pages);
1262 
1263 void agp_generic_destroy_page(struct page *page, int flags)
1264 {
1265         if (page == NULL)
1266                 return;
1267 
1268         if (flags & AGP_PAGE_DESTROY_UNMAP)
1269                 unmap_page_from_agp(page);
1270 
1271         if (flags & AGP_PAGE_DESTROY_FREE) {
1272                 put_page(page);
1273                 __free_page(page);
1274                 atomic_dec(&agp_bridge->current_memory_agp);
1275         }
1276 }
1277 EXPORT_SYMBOL(agp_generic_destroy_page);
1278 
1279 /* End Basic Page Allocation Routines */
1280 
1281 
1282 /**
1283  * agp_enable  -  initialise the agp point-to-point connection.
1284  *
1285  * @mode:       agp mode register value to configure with.
1286  */
1287 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1288 {
1289         if (!bridge)
1290                 return;
1291         bridge->driver->agp_enable(bridge, mode);
1292 }
1293 EXPORT_SYMBOL(agp_enable);
1294 
1295 /* When we remove the global variable agp_bridge from all drivers
1296  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1297  */
1298 
1299 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1300 {
1301         if (list_empty(&agp_bridges))
1302                 return NULL;
1303 
1304         return agp_bridge;
1305 }
1306 
1307 static void ipi_handler(void *null)
1308 {
1309         flush_agp_cache();
1310 }
1311 
1312 void global_cache_flush(void)
1313 {
1314         on_each_cpu(ipi_handler, NULL, 1);
1315 }
1316 EXPORT_SYMBOL(global_cache_flush);
1317 
1318 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1319                                       dma_addr_t addr, int type)
1320 {
1321         /* memory type is ignored in the generic routine */
1322         if (bridge->driver->masks)
1323                 return addr | bridge->driver->masks[0].mask;
1324         else
1325                 return addr;
1326 }
1327 EXPORT_SYMBOL(agp_generic_mask_memory);
1328 
1329 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1330                                   int type)
1331 {
1332         if (type >= AGP_USER_TYPES)
1333                 return 0;
1334         return type;
1335 }
1336 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1337 
1338 /*
1339  * These functions are implemented according to the AGPv3 spec,
1340  * which covers implementation details that had previously been
1341  * left open.
1342  */
1343 
1344 int agp3_generic_fetch_size(void)
1345 {
1346         u16 temp_size;
1347         int i;
1348         struct aper_size_info_16 *values;
1349 
1350         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1351         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1352 
1353         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1354                 if (temp_size == values[i].size_value) {
1355                         agp_bridge->previous_size =
1356                                 agp_bridge->current_size = (void *) (values + i);
1357 
1358                         agp_bridge->aperture_size_idx = i;
1359                         return values[i].size;
1360                 }
1361         }
1362         return 0;
1363 }
1364 EXPORT_SYMBOL(agp3_generic_fetch_size);
1365 
1366 void agp3_generic_tlbflush(struct agp_memory *mem)
1367 {
1368         u32 ctrl;
1369         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1370         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1371         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1372 }
1373 EXPORT_SYMBOL(agp3_generic_tlbflush);
1374 
1375 int agp3_generic_configure(void)
1376 {
1377         u32 temp;
1378         struct aper_size_info_16 *current_size;
1379 
1380         current_size = A_SIZE_16(agp_bridge->current_size);
1381 
1382         agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
1383                                                     AGP_APERTURE_BAR);
1384 
1385         /* set aperture size */
1386         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1387         /* set gart pointer */
1388         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1389         /* enable aperture and GTLB */
1390         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1391         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1392         return 0;
1393 }
1394 EXPORT_SYMBOL(agp3_generic_configure);
1395 
1396 void agp3_generic_cleanup(void)
1397 {
1398         u32 ctrl;
1399         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1400         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1401 }
1402 EXPORT_SYMBOL(agp3_generic_cleanup);
1403 
1404 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1405 {
1406         {4096, 1048576, 10,0x000},
1407         {2048,  524288, 9, 0x800},
1408         {1024,  262144, 8, 0xc00},
1409         { 512,  131072, 7, 0xe00},
1410         { 256,   65536, 6, 0xf00},
1411         { 128,   32768, 5, 0xf20},
1412         {  64,   16384, 4, 0xf30},
1413         {  32,    8192, 3, 0xf38},
1414         {  16,    4096, 2, 0xf3c},
1415         {   8,    2048, 1, 0xf3e},
1416         {   4,    1024, 0, 0xf3f}
1417 };
1418 EXPORT_SYMBOL(agp3_generic_sizes);
1419
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/char/agp/generic.c

DEFINITIONS
