drivers/char/agp/generic.c

   1 /*
   2  * AGPGART driver.
   3  * Copyright (C) 2004 Silicon Graphics, Inc.
   4  * Copyright (C) 2002-2005 Dave Jones.
   5  * Copyright (C) 1999 Jeff Hartmann.
   6  * Copyright (C) 1999 Precision Insight, Inc.
   7  * Copyright (C) 1999 Xi Graphics, Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
  25  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * TODO:
  28  * - Allocate more than order 0 pages to avoid too much linear map splitting.
  29  */
  30 #include <linux/config.h>
  31 #include <linux/module.h>
  32 #include <linux/pci.h>
  33 #include <linux/init.h>
  34 #include <linux/pagemap.h>
  35 #include <linux/miscdevice.h>
  36 #include <linux/pm.h>
  37 #include <linux/agp_backend.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/mm.h>
  41 #include <asm/io.h>
  42 #include <asm/cacheflush.h>
  43 #include <asm/pgtable.h>
  44 #include "agp.h"
  45
  46 __u32 *agp_gatt_table;
  47 int agp_memory_reserved;
  48
  49 /*
  50  * Needed by the Nforce GART driver for the time being. Would be
  51  * nice to do this some other way instead of needing this export.
  52  */
  53 EXPORT_SYMBOL_GPL(agp_memory_reserved);
  54
  55 #if defined(CONFIG_X86)
  56 int map_page_into_agp(struct page *page)
  57 {
  58         int i;
  59         i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
  60         /* Caller's responsibility to call global_flush_tlb() for
  61          * performance reasons */
  62         return i;
  63 }
  64 EXPORT_SYMBOL_GPL(map_page_into_agp);
  65
  66 int unmap_page_from_agp(struct page *page)
  67 {
  68         int i;
  69         i = change_page_attr(page, 1, PAGE_KERNEL);
  70         /* Caller's responsibility to call global_flush_tlb() for
  71          * performance reasons */
  72         return i;
  73 }
  74 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
  75 #endif
  76
  77 /*
  78  * Generic routines for handling agp_memory structures -
  79  * They use the basic page allocation routines to do the brunt of the work.
  80  */
  81
  82 void agp_free_key(int key)
  83 {
  84         if (key < 0)
  85                 return;
  86
  87         if (key < MAXKEY)
  88                 clear_bit(key, agp_bridge->key_list);
  89 }
  90 EXPORT_SYMBOL(agp_free_key);
  91
  92
  93 static int agp_get_key(void)
  94 {
  95         int bit;
  96
  97         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  98         if (bit < MAXKEY) {
  99                 set_bit(bit, agp_bridge->key_list);
 100                 return bit;
 101         }
 102         return -1;
 103 }
 104
 105
 106 struct agp_memory *agp_create_memory(int scratch_pages)
 107 {
 108         struct agp_memory *new;
 109
 110         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 111         if (new == NULL)
 112                 return NULL;
 113
 114         new->key = agp_get_key();
 115
 116         if (new->key < 0) {
 117                 kfree(new);
 118                 return NULL;
 119         }
 120         new->memory = vmalloc(PAGE_SIZE * scratch_pages);
 121
 122         if (new->memory == NULL) {
 123                 agp_free_key(new->key);
 124                 kfree(new);
 125                 return NULL;
 126         }
 127         new->num_scratch_pages = scratch_pages;
 128         return new;
 129 }
 130 EXPORT_SYMBOL(agp_create_memory);
 131
 132 /**
 133  *      agp_free_memory - free memory associated with an agp_memory pointer.
 134  *
 135  *      @curr:          agp_memory pointer to be freed.
 136  *
 137  *      It is the only function that can be called when the backend is not owned
 138  *      by the caller.  (So it can free memory on client death.)
 139  */
 140 void agp_free_memory(struct agp_memory *curr)
 141 {
 142         size_t i;
 143
 144         if (curr == NULL)
 145                 return;
 146
 147         if (curr->is_bound == TRUE)
 148                 agp_unbind_memory(curr);
 149
 150         if (curr->type != 0) {
 151                 curr->bridge->driver->free_by_type(curr);
 152                 return;
 153         }
 154         if (curr->page_count != 0) {
 155                 for (i = 0; i < curr->page_count; i++) {
 156                         curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
 157                 }
 158                 global_flush_tlb();
 159         }
 160         agp_free_key(curr->key);
 161         vfree(curr->memory);
 162         kfree(curr);
 163 }
 164 EXPORT_SYMBOL(agp_free_memory);
 165
 166 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 167
 168 /**
 169  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 170  *
 171  *      @page_count:    size_t argument of the number of pages
 172  *      @type:  u32 argument of the type of memory to be allocated.
 173  *
 174  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 175  *      maps to physical ram.  Any other type is device dependent.
 176  *
 177  *      It returns NULL whenever memory is unavailable.
 178  */
 179 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 180                                         size_t page_count, u32 type)
 181 {
 182         int scratch_pages;
 183         struct agp_memory *new;
 184         size_t i;
 185
 186         if (!bridge)
 187                 return NULL;
 188
 189         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
 190                 return NULL;
 191
 192         if (type != 0) {
 193                 new = bridge->driver->alloc_by_type(page_count, type);
 194                 if (new)
 195                         new->bridge = bridge;
 196                 return new;
 197         }
 198
 199         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 200
 201         new = agp_create_memory(scratch_pages);
 202
 203         if (new == NULL)
 204                 return NULL;
 205
 206         for (i = 0; i < page_count; i++) {
 207                 void *addr = bridge->driver->agp_alloc_page(bridge);
 208
 209                 if (addr == NULL) {
 210                         agp_free_memory(new);
 211                         return NULL;
 212                 }
 213                 new->memory[i] = virt_to_gart(addr);
 214                 new->page_count++;
 215         }
 216         global_flush_tlb();
 217
 218         new->bridge = bridge;
 219
 220         flush_agp_mappings();
 221
 222         return new;
 223 }
 224 EXPORT_SYMBOL(agp_allocate_memory);
 225
 226
 227 /* End - Generic routines for handling agp_memory structures */
 228
 229
 230 static int agp_return_size(void)
 231 {
 232         int current_size;
 233         void *temp;
 234
 235         temp = agp_bridge->current_size;
 236
 237         switch (agp_bridge->driver->size_type) {
 238         case U8_APER_SIZE:
 239                 current_size = A_SIZE_8(temp)->size;
 240                 break;
 241         case U16_APER_SIZE:
 242                 current_size = A_SIZE_16(temp)->size;
 243                 break;
 244         case U32_APER_SIZE:
 245                 current_size = A_SIZE_32(temp)->size;
 246                 break;
 247         case LVL2_APER_SIZE:
 248                 current_size = A_SIZE_LVL2(temp)->size;
 249                 break;
 250         case FIXED_APER_SIZE:
 251                 current_size = A_SIZE_FIX(temp)->size;
 252                 break;
 253         default:
 254                 current_size = 0;
 255                 break;
 256         }
 257
 258         current_size -= (agp_memory_reserved / (1024*1024));
 259         if (current_size <0)
 260                 current_size = 0;
 261         return current_size;
 262 }
 263
 264
 265 int agp_num_entries(void)
 266 {
 267         int num_entries;
 268         void *temp;
 269
 270         temp = agp_bridge->current_size;
 271
 272         switch (agp_bridge->driver->size_type) {
 273         case U8_APER_SIZE:
 274                 num_entries = A_SIZE_8(temp)->num_entries;
 275                 break;
 276         case U16_APER_SIZE:
 277                 num_entries = A_SIZE_16(temp)->num_entries;
 278                 break;
 279         case U32_APER_SIZE:
 280                 num_entries = A_SIZE_32(temp)->num_entries;
 281                 break;
 282         case LVL2_APER_SIZE:
 283                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 284                 break;
 285         case FIXED_APER_SIZE:
 286                 num_entries = A_SIZE_FIX(temp)->num_entries;
 287                 break;
 288         default:
 289                 num_entries = 0;
 290                 break;
 291         }
 292
 293         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 294         if (num_entries<0)
 295                 num_entries = 0;
 296         return num_entries;
 297 }
 298 EXPORT_SYMBOL_GPL(agp_num_entries);
 299
 300
 301 /**
 302  *      agp_copy_info  -  copy bridge state information
 303  *
 304  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 305  *
 306  *      This function copies information about the agp bridge device and the state of
 307  *      the agp backend into an agp_kern_info pointer.
 308  */
 309 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 310 {
 311         memset(info, 0, sizeof(struct agp_kern_info));
 312         if (!bridge) {
 313                 info->chipset = NOT_SUPPORTED;
 314                 return -EIO;
 315         }
 316
 317         info->version.major = bridge->version->major;
 318         info->version.minor = bridge->version->minor;
 319         info->chipset = SUPPORTED;
 320         info->device = bridge->dev;
 321         if (bridge->mode & AGPSTAT_MODE_3_0)
 322                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 323         else
 324                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 325         info->aper_base = bridge->gart_bus_addr;
 326         info->aper_size = agp_return_size();
 327         info->max_memory = bridge->max_memory_agp;
 328         info->current_memory = atomic_read(&bridge->current_memory_agp);
 329         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 330         info->vm_ops = bridge->vm_ops;
 331         info->page_mask = ~0UL;
 332         return 0;
 333 }
 334 EXPORT_SYMBOL(agp_copy_info);
 335
 336 /* End - Routine to copy over information structure */
 337
 338 /*
 339  * Routines for handling swapping of agp_memory into the GATT -
 340  * These routines take agp_memory and insert them into the GATT.
 341  * They call device specific routines to actually write to the GATT.
 342  */
 343
 344 /**
 345  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 346  *
 347  *      @curr:          agp_memory pointer
 348  *      @pg_start:      an offset into the graphics aperture translation table
 349  *
 350  *      It returns -EINVAL if the pointer == NULL.
 351  *      It returns -EBUSY if the area of the table requested is already in use.
 352  */
 353 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 354 {
 355         int ret_val;
 356
 357         if (curr == NULL)
 358                 return -EINVAL;
 359
 360         if (curr->is_bound == TRUE) {
 361                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
 362                 return -EINVAL;
 363         }
 364         if (curr->is_flushed == FALSE) {
 365                 curr->bridge->driver->cache_flush();
 366                 curr->is_flushed = TRUE;
 367         }
 368         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 369
 370         if (ret_val != 0)
 371                 return ret_val;
 372
 373         curr->is_bound = TRUE;
 374         curr->pg_start = pg_start;
 375         return 0;
 376 }
 377 EXPORT_SYMBOL(agp_bind_memory);
 378
 379
 380 /**
 381  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 382  *
 383  * @curr:       agp_memory pointer to be removed from the GATT.
 384  *
 385  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 386  * the graphics aperture translation table or if the agp_memory pointer == NULL
 387  */
 388 int agp_unbind_memory(struct agp_memory *curr)
 389 {
 390         int ret_val;
 391
 392         if (curr == NULL)
 393                 return -EINVAL;
 394
 395         if (curr->is_bound != TRUE) {
 396                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
 397                 return -EINVAL;
 398         }
 399
 400         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 401
 402         if (ret_val != 0)
 403                 return ret_val;
 404
 405         curr->is_bound = FALSE;
 406         curr->pg_start = 0;
 407         return 0;
 408 }
 409 EXPORT_SYMBOL(agp_unbind_memory);
 410
 411 /* End - Routines for handling swapping of agp_memory into the GATT */
 412
 413
 414 /* Generic Agp routines - Start */
 415 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 416 {
 417         u32 tmp;
 418
 419         if (*requested_mode & AGP2_RESERVED_MASK) {
 420                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 421                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
 422                 *requested_mode &= ~AGP2_RESERVED_MASK;
 423         }
 424
 425         /* Check the speed bits make sense. Only one should be set. */
 426         tmp = *requested_mode & 7;
 427         switch (tmp) {
 428                 case 0:
 429                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 430                         *requested_mode |= AGPSTAT2_1X;
 431                         break;
 432                 case 1:
 433                 case 2:
 434                         break;
 435                 case 3:
 436                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 437                         break;
 438                 case 4:
 439                         break;
 440                 case 5:
 441                 case 6:
 442                 case 7:
 443                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 444                         break;
 445         }
 446
 447         /* disable SBA if it's not supported */
 448         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 449                 *bridge_agpstat &= ~AGPSTAT_SBA;
 450
 451         /* Set rate */
 452         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 453                 *bridge_agpstat &= ~AGPSTAT2_4X;
 454
 455         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 456                 *bridge_agpstat &= ~AGPSTAT2_2X;
 457
 458         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 459                 *bridge_agpstat &= ~AGPSTAT2_1X;
 460
 461         /* Now we know what mode it should be, clear out the unwanted bits. */
 462         if (*bridge_agpstat & AGPSTAT2_4X)
 463                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 464
 465         if (*bridge_agpstat & AGPSTAT2_2X)
 466                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 467
 468         if (*bridge_agpstat & AGPSTAT2_1X)
 469                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 470
 471         /* Apply any errata. */
 472         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 473                 *bridge_agpstat &= ~AGPSTAT_FW;
 474
 475         if (agp_bridge->flags & AGP_ERRATA_SBA)
 476                 *bridge_agpstat &= ~AGPSTAT_SBA;
 477
 478         if (agp_bridge->flags & AGP_ERRATA_1X) {
 479                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 480                 *bridge_agpstat |= AGPSTAT2_1X;
 481         }
 482
 483         /* If we've dropped down to 1X, disable fast writes. */
 484         if (*bridge_agpstat & AGPSTAT2_1X)
 485                 *bridge_agpstat &= ~AGPSTAT_FW;
 486 }
 487
 488 /*
 489  * requested_mode = Mode requested by (typically) X.
 490  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 491  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 492  */
 493 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 494 {
 495         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 496         u32 tmp;
 497
 498         if (*requested_mode & AGP3_RESERVED_MASK) {
 499                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 500                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
 501                 *requested_mode &= ~AGP3_RESERVED_MASK;
 502         }
 503
 504         /* Check the speed bits make sense. */
 505         tmp = *requested_mode & 7;
 506         if (tmp == 0) {
 507                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 508                 *requested_mode |= AGPSTAT3_4X;
 509         }
 510         if (tmp >= 3) {
 511                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 512                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 513         }
 514
 515         /* ARQSZ - Set the value to the maximum one.
 516          * Don't allow the mode register to override values. */
 517         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 518                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 519
 520         /* Calibration cycle.
 521          * Don't allow the mode register to override values. */
 522         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 523                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 524
 525         /* SBA *must* be supported for AGP v3 */
 526         *bridge_agpstat |= AGPSTAT_SBA;
 527
 528         /*
 529          * Set speed.
 530          * Check for invalid speeds. This can happen when applications
 531          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 532          */
 533         if (*requested_mode & AGPSTAT_MODE_3_0) {
 534                 /*
 535                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 536                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 537                  * AGP2.x 4x -> AGP3.0 4x.
 538                  */
 539                 if (*requested_mode & AGPSTAT2_4X) {
 540                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 541                                                 current->comm, *requested_mode);
 542                         *requested_mode &= ~AGPSTAT2_4X;
 543                         *requested_mode |= AGPSTAT3_4X;
 544                 }
 545         } else {
 546                 /*
 547                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 548                  * but have been passed an AGP 2.x mode.
 549                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 550                  */
 551                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 552                                         current->comm, *requested_mode);
 553                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 554                 *requested_mode |= AGPSTAT3_4X;
 555         }
 556
 557         if (*requested_mode & AGPSTAT3_8X) {
 558                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 559                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 560                         *bridge_agpstat |= AGPSTAT3_4X;
 561                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
 562                         return;
 563                 }
 564                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 565                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 566                         *bridge_agpstat |= AGPSTAT3_4X;
 567                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
 568                         return;
 569                 }
 570                 /* All set, bridge & device can do AGP x8*/
 571                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 572                 goto done;
 573
 574         } else {
 575
 576                 /*
 577                  * If we didn't specify AGPx8, we can only do x4.
 578                  * If the hardware can't do x4, we're up shit creek, and never
 579                  *  should have got this far.
 580                  */
 581                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 582                 if ((*bridge_agpstat & AGPSTAT3_4X) && (*vga_agpstat & AGPSTAT3_4X))
 583                         *bridge_agpstat |= AGPSTAT3_4X;
 584                 else {
 585                         printk(KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
 586                                                         "[bridge_agpstat:%x vga_agpstat:%x fell back to:- bridge_agpstat:%x vga_agpstat:%x]\n",
 587                                                         origbridge, origvga, *bridge_agpstat, *vga_agpstat);
 588                         if (!(*bridge_agpstat & AGPSTAT3_4X))
 589                                 printk(KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
 590                         if (!(*vga_agpstat & AGPSTAT3_4X))
 591                                 printk(KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
 592                         return;
 593                 }
 594         }
 595
 596 done:
 597         /* Apply any errata. */
 598         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 599                 *bridge_agpstat &= ~AGPSTAT_FW;
 600
 601         if (agp_bridge->flags & AGP_ERRATA_SBA)
 602                 *bridge_agpstat &= ~AGPSTAT_SBA;
 603
 604         if (agp_bridge->flags & AGP_ERRATA_1X) {
 605                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 606                 *bridge_agpstat |= AGPSTAT2_1X;
 607         }
 608 }
 609
 610
 611 /**
 612  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 613  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 614  * @requested_mode: requested agp_stat from userspace (Typically from X)
 615  * @bridge_agpstat: current agp_stat from AGP bridge.
 616  *
 617  * This function will hunt for an AGP graphics card, and try to match
 618  * the requested mode to the capabilities of both the bridge and the card.
 619  */
 620 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 621 {
 622         struct pci_dev *device = NULL;
 623         u32 vga_agpstat;
 624         u8 cap_ptr;
 625
 626         for (;;) {
 627                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 628                 if (!device) {
 629                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 630                         return 0;
 631                 }
 632                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 633                 if (cap_ptr)
 634                         break;
 635         }
 636
 637         /*
 638          * Ok, here we have a AGP device. Disable impossible
 639          * settings, and adjust the readqueue to the minimum.
 640          */
 641         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 642
 643         /* adjust RQ depth */
 644         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 645              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 646                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 647
 648         /* disable FW if it's not supported */
 649         if (!((bridge_agpstat & AGPSTAT_FW) &&
 650                  (vga_agpstat & AGPSTAT_FW) &&
 651                  (requested_mode & AGPSTAT_FW)))
 652                 bridge_agpstat &= ~AGPSTAT_FW;
 653
 654         /* Check to see if we are operating in 3.0 mode */
 655         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 656                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 657         else
 658                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 659
 660         pci_dev_put(device);
 661         return bridge_agpstat;
 662 }
 663 EXPORT_SYMBOL(agp_collect_device_status);
 664
 665
 666 void agp_device_command(u32 bridge_agpstat, int agp_v3)
 667 {
 668         struct pci_dev *device = NULL;
 669         int mode;
 670
 671         mode = bridge_agpstat & 0x7;
 672         if (agp_v3)
 673                 mode *= 4;
 674
 675         for_each_pci_dev(device) {
 676                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 677                 if (!agp)
 678                         continue;
 679
 680                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
 681                                 agp_v3 ? 3 : 2, pci_name(device), mode);
 682                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 683         }
 684 }
 685 EXPORT_SYMBOL(agp_device_command);
 686
 687
 688 void get_agp_version(struct agp_bridge_data *bridge)
 689 {
 690         u32 ncapid;
 691
 692         /* Exit early if already set by errata workarounds. */
 693         if (bridge->major_version != 0)
 694                 return;
 695
 696         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 697         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 698         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 699 }
 700 EXPORT_SYMBOL(get_agp_version);
 701
 702
 703 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 704 {
 705         u32 bridge_agpstat, temp;
 706
 707         get_agp_version(agp_bridge);
 708
 709         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
 710                                 agp_bridge->major_version,
 711                                 agp_bridge->minor_version,
 712                                 pci_name(agp_bridge->dev));
 713
 714         pci_read_config_dword(agp_bridge->dev,
 715                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 716
 717         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 718         if (bridge_agpstat == 0)
 719                 /* Something bad happened. FIXME: Return error code? */
 720                 return;
 721
 722         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 723
 724         /* Do AGP version specific frobbing. */
 725         if (bridge->major_version >= 3) {
 726                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 727                         /* If we have 3.5, we can do the isoch stuff. */
 728                         if (bridge->minor_version >= 5)
 729                                 agp_3_5_enable(bridge);
 730                         agp_device_command(bridge_agpstat, TRUE);
 731                         return;
 732                 } else {
 733                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 734                     bridge_agpstat &= ~(7<<10) ;
 735                     pci_read_config_dword(bridge->dev,
 736                                         bridge->capndx+AGPCTRL, &temp);
 737                     temp |= (1<<9);
 738                     pci_write_config_dword(bridge->dev,
 739                                         bridge->capndx+AGPCTRL, temp);
 740
 741                     printk(KERN_INFO PFX "Device is in legacy mode,"
 742                                 " falling back to 2.x\n");
 743                 }
 744         }
 745
 746         /* AGP v<3 */
 747         agp_device_command(bridge_agpstat, FALSE);
 748 }
 749 EXPORT_SYMBOL(agp_generic_enable);
 750
 751
 752 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 753 {
 754         char *table;
 755         char *table_end;
 756         int size;
 757         int page_order;
 758         int num_entries;
 759         int i;
 760         void *temp;
 761         struct page *page;
 762
 763         /* The generic routines can't handle 2 level gatt's */
 764         if (bridge->driver->size_type == LVL2_APER_SIZE)
 765                 return -EINVAL;
 766
 767         table = NULL;
 768         i = bridge->aperture_size_idx;
 769         temp = bridge->current_size;
 770         size = page_order = num_entries = 0;
 771
 772         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 773                 do {
 774                         switch (bridge->driver->size_type) {
 775                         case U8_APER_SIZE:
 776                                 size = A_SIZE_8(temp)->size;
 777                                 page_order =
 778                                     A_SIZE_8(temp)->page_order;
 779                                 num_entries =
 780                                     A_SIZE_8(temp)->num_entries;
 781                                 break;
 782                         case U16_APER_SIZE:
 783                                 size = A_SIZE_16(temp)->size;
 784                                 page_order = A_SIZE_16(temp)->page_order;
 785                                 num_entries = A_SIZE_16(temp)->num_entries;
 786                                 break;
 787                         case U32_APER_SIZE:
 788                                 size = A_SIZE_32(temp)->size;
 789                                 page_order = A_SIZE_32(temp)->page_order;
 790                                 num_entries = A_SIZE_32(temp)->num_entries;
 791                                 break;
 792                                 /* This case will never really happen. */
 793                         case FIXED_APER_SIZE:
 794                         case LVL2_APER_SIZE:
 795                         default:
 796                                 size = page_order = num_entries = 0;
 797                                 break;
 798                         }
 799
 800                         table = alloc_gatt_pages(page_order);
 801
 802                         if (table == NULL) {
 803                                 i++;
 804                                 switch (bridge->driver->size_type) {
 805                                 case U8_APER_SIZE:
 806                                         bridge->current_size = A_IDX8(bridge);
 807                                         break;
 808                                 case U16_APER_SIZE:
 809                                         bridge->current_size = A_IDX16(bridge);
 810                                         break;
 811                                 case U32_APER_SIZE:
 812                                         bridge->current_size = A_IDX32(bridge);
 813                                         break;
 814                                         /* This case will never really happen. */
 815                                 case FIXED_APER_SIZE:
 816                                 case LVL2_APER_SIZE:
 817                                 default:
 818                                         bridge->current_size =
 819                                             bridge->current_size;
 820                                         break;
 821                                 }
 822                                 temp = bridge->current_size;
 823                         } else {
 824                                 bridge->aperture_size_idx = i;
 825                         }
 826                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 827         } else {
 828                 size = ((struct aper_size_info_fixed *) temp)->size;
 829                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 830                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 831                 table = alloc_gatt_pages(page_order);
 832         }
 833
 834         if (table == NULL)
 835                 return -ENOMEM;
 836
 837         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 838
 839         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 840                 SetPageReserved(page);
 841
 842         bridge->gatt_table_real = (u32 *) table;
 843         agp_gatt_table = (void *)table;
 844
 845         bridge->driver->cache_flush();
 846         bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
 847                                         (PAGE_SIZE * (1 << page_order)));
 848         bridge->driver->cache_flush();
 849
 850         if (bridge->gatt_table == NULL) {
 851                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 852                         ClearPageReserved(page);
 853
 854                 free_gatt_pages(table, page_order);
 855
 856                 return -ENOMEM;
 857         }
 858         bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
 859
 860         /* AK: bogus, should encode addresses > 4GB */
 861         for (i = 0; i < num_entries; i++) {
 862                 writel(bridge->scratch_page, bridge->gatt_table+i);
 863                 readl(bridge->gatt_table+i);    /* PCI Posting. */
 864         }
 865
 866         return 0;
 867 }
 868 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 869
 870 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
 871 {
 872         int page_order;
 873         char *table, *table_end;
 874         void *temp;
 875         struct page *page;
 876
 877         temp = bridge->current_size;
 878
 879         switch (bridge->driver->size_type) {
 880         case U8_APER_SIZE:
 881                 page_order = A_SIZE_8(temp)->page_order;
 882                 break;
 883         case U16_APER_SIZE:
 884                 page_order = A_SIZE_16(temp)->page_order;
 885                 break;
 886         case U32_APER_SIZE:
 887                 page_order = A_SIZE_32(temp)->page_order;
 888                 break;
 889         case FIXED_APER_SIZE:
 890                 page_order = A_SIZE_FIX(temp)->page_order;
 891                 break;
 892         case LVL2_APER_SIZE:
 893                 /* The generic routines can't deal with 2 level gatt's */
 894                 return -EINVAL;
 895                 break;
 896         default:
 897                 page_order = 0;
 898                 break;
 899         }
 900
 901         /* Do not worry about freeing memory, because if this is
 902          * called, then all agp memory is deallocated and removed
 903          * from the table. */
 904
 905         iounmap(bridge->gatt_table);
 906         table = (char *) bridge->gatt_table_real;
 907         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 908
 909         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 910                 ClearPageReserved(page);
 911
 912         free_gatt_pages(bridge->gatt_table_real, page_order);
 913
 914         agp_gatt_table = NULL;
 915         bridge->gatt_table = NULL;
 916         bridge->gatt_table_real = NULL;
 917         bridge->gatt_bus_addr = 0;
 918
 919         return 0;
 920 }
 921 EXPORT_SYMBOL(agp_generic_free_gatt_table);
 922
 923
 924 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
 925 {
 926         int num_entries;
 927         size_t i;
 928         off_t j;
 929         void *temp;
 930         struct agp_bridge_data *bridge;
 931
 932         bridge = mem->bridge;
 933         if (!bridge)
 934                 return -EINVAL;
 935
 936         temp = bridge->current_size;
 937
 938         switch (bridge->driver->size_type) {
 939         case U8_APER_SIZE:
 940                 num_entries = A_SIZE_8(temp)->num_entries;
 941                 break;
 942         case U16_APER_SIZE:
 943                 num_entries = A_SIZE_16(temp)->num_entries;
 944                 break;
 945         case U32_APER_SIZE:
 946                 num_entries = A_SIZE_32(temp)->num_entries;
 947                 break;
 948         case FIXED_APER_SIZE:
 949                 num_entries = A_SIZE_FIX(temp)->num_entries;
 950                 break;
 951         case LVL2_APER_SIZE:
 952                 /* The generic routines can't deal with 2 level gatt's */
 953                 return -EINVAL;
 954                 break;
 955         default:
 956                 num_entries = 0;
 957                 break;
 958         }
 959
 960         num_entries -= agp_memory_reserved/PAGE_SIZE;
 961         if (num_entries < 0) num_entries = 0;
 962
 963         if (type != 0 || mem->type != 0) {
 964                 /* The generic routines know nothing of memory types */
 965                 return -EINVAL;
 966         }
 967
 968         /* AK: could wrap */
 969         if ((pg_start + mem->page_count) > num_entries)
 970                 return -EINVAL;
 971
 972         j = pg_start;
 973
 974         while (j < (pg_start + mem->page_count)) {
 975                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
 976                         return -EBUSY;
 977                 j++;
 978         }
 979
 980         if (mem->is_flushed == FALSE) {
 981                 bridge->driver->cache_flush();
 982                 mem->is_flushed = TRUE;
 983         }
 984
 985         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 986                 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mem->type), bridge->gatt_table+j);
 987                 readl(bridge->gatt_table+j);    /* PCI Posting. */
 988         }
 989
 990         bridge->driver->tlb_flush(mem);
 991         return 0;
 992 }
 993 EXPORT_SYMBOL(agp_generic_insert_memory);
 994
 995
 996 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 997 {
 998         size_t i;
 999         struct agp_bridge_data *bridge;
1000
1001         bridge = mem->bridge;
1002         if (!bridge)
1003                 return -EINVAL;
1004
1005         if (type != 0 || mem->type != 0) {
1006                 /* The generic routines know nothing of memory types */
1007                 return -EINVAL;
1008         }
1009
1010         /* AK: bogus, should encode addresses > 4GB */
1011         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1012                 writel(bridge->scratch_page, bridge->gatt_table+i);
1013                 readl(bridge->gatt_table+i);    /* PCI Posting. */
1014         }
1015
1016         global_cache_flush();
1017         bridge->driver->tlb_flush(mem);
1018         return 0;
1019 }
1020 EXPORT_SYMBOL(agp_generic_remove_memory);
1021
1022
1023 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1024 {
1025         return NULL;
1026 }
1027 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1028
1029
1030 void agp_generic_free_by_type(struct agp_memory *curr)
1031 {
1032         vfree(curr->memory);
1033         agp_free_key(curr->key);
1034         kfree(curr);
1035 }
1036 EXPORT_SYMBOL(agp_generic_free_by_type);
1037
1038
1039 /*
1040  * Basic Page Allocation Routines -
1041  * These routines handle page allocation and by default they reserve the allocated
1042  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1043  * against a maximum value.
1044  */
1045
1046 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1047 {
1048         struct page * page;
1049
1050         page = alloc_page(GFP_KERNEL);
1051         if (page == NULL)
1052                 return NULL;
1053
1054         map_page_into_agp(page);
1055
1056         get_page(page);
1057         SetPageLocked(page);
1058         atomic_inc(&agp_bridge->current_memory_agp);
1059         return page_address(page);
1060 }
1061 EXPORT_SYMBOL(agp_generic_alloc_page);
1062
1063
1064 void agp_generic_destroy_page(void *addr)
1065 {
1066         struct page *page;
1067
1068         if (addr == NULL)
1069                 return;
1070
1071         page = virt_to_page(addr);
1072         unmap_page_from_agp(page);
1073         put_page(page);
1074         unlock_page(page);
1075         free_page((unsigned long)addr);
1076         atomic_dec(&agp_bridge->current_memory_agp);
1077 }
1078 EXPORT_SYMBOL(agp_generic_destroy_page);
1079
1080 /* End Basic Page Allocation Routines */
1081
1082
1083 /**
1084  * agp_enable  -  initialise the agp point-to-point connection.
1085  *
1086  * @mode:       agp mode register value to configure with.
1087  */
1088 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1089 {
1090         if (!bridge)
1091                 return;
1092         bridge->driver->agp_enable(bridge, mode);
1093 }
1094 EXPORT_SYMBOL(agp_enable);
1095
1096 /* When we remove the global variable agp_bridge from all drivers
1097  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1098  */
1099
1100 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1101 {
1102         if (list_empty(&agp_bridges))
1103                 return NULL;
1104
1105         return agp_bridge;
1106 }
1107
1108 static void ipi_handler(void *null)
1109 {
1110         flush_agp_cache();
1111 }
1112
1113 void global_cache_flush(void)
1114 {
1115         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1116                 panic(PFX "timed out waiting for the other CPUs!\n");
1117 }
1118 EXPORT_SYMBOL(global_cache_flush);
1119
1120 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1121         unsigned long addr, int type)
1122 {
1123         /* memory type is ignored in the generic routine */
1124         if (bridge->driver->masks)
1125                 return addr | bridge->driver->masks[0].mask;
1126         else
1127                 return addr;
1128 }
1129 EXPORT_SYMBOL(agp_generic_mask_memory);
1130
1131 /*
1132  * These functions are implemented according to the AGPv3 spec,
1133  * which covers implementation details that had previously been
1134  * left open.
1135  */
1136
1137 int agp3_generic_fetch_size(void)
1138 {
1139         u16 temp_size;
1140         int i;
1141         struct aper_size_info_16 *values;
1142
1143         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1144         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1145
1146         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1147                 if (temp_size == values[i].size_value) {
1148                         agp_bridge->previous_size =
1149                                 agp_bridge->current_size = (void *) (values + i);
1150
1151                         agp_bridge->aperture_size_idx = i;
1152                         return values[i].size;
1153                 }
1154         }
1155         return 0;
1156 }
1157 EXPORT_SYMBOL(agp3_generic_fetch_size);
1158
1159 void agp3_generic_tlbflush(struct agp_memory *mem)
1160 {
1161         u32 ctrl;
1162         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1163         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1164         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1165 }
1166 EXPORT_SYMBOL(agp3_generic_tlbflush);
1167
1168 int agp3_generic_configure(void)
1169 {
1170         u32 temp;
1171         struct aper_size_info_16 *current_size;
1172
1173         current_size = A_SIZE_16(agp_bridge->current_size);
1174
1175         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1176         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1177
1178         /* set aperture size */
1179         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1180         /* set gart pointer */
1181         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1182         /* enable aperture and GTLB */
1183         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1184         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1185         return 0;
1186 }
1187 EXPORT_SYMBOL(agp3_generic_configure);
1188
1189 void agp3_generic_cleanup(void)
1190 {
1191         u32 ctrl;
1192         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1193         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1194 }
1195 EXPORT_SYMBOL(agp3_generic_cleanup);
1196
1197 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1198 {
1199         {4096, 1048576, 10,0x000},
1200         {2048,  524288, 9, 0x800},
1201         {1024,  262144, 8, 0xc00},
1202         { 512,  131072, 7, 0xe00},
1203         { 256,   65536, 6, 0xf00},
1204         { 128,   32768, 5, 0xf20},
1205         {  64,   16384, 4, 0xf30},
1206         {  32,    8192, 3, 0xf38},
1207         {  16,    4096, 2, 0xf3c},
1208         {   8,    2048, 1, 0xf3e},
1209         {   4,    1024, 0, 0xf3f}
1210 };
1211 EXPORT_SYMBOL(agp3_generic_sizes);
1212