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