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