git.oblomov.eu Git - linux-2.6/blob - 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         global_flush_tlb();
  61         return i;
  62 }
  63 EXPORT_SYMBOL_GPL(map_page_into_agp);
  64
  65 int unmap_page_from_agp(struct page *page)
  66 {
  67         int i;
  68         i = change_page_attr(page, 1, PAGE_KERNEL);
  69         global_flush_tlb();
  70         return i;
  71 }
  72 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
  73 #endif
  74
  75 /*
  76  * Generic routines for handling agp_memory structures -
  77  * They use the basic page allocation routines to do the brunt of the work.
  78  */
  79
  80 void agp_free_key(int key)
  81 {
  82         if (key < 0)
  83                 return;
  84
  85         if (key < MAXKEY)
  86                 clear_bit(key, agp_bridge->key_list);
  87 }
  88 EXPORT_SYMBOL(agp_free_key);
  89
  90
  91 static int agp_get_key(void)
  92 {
  93         int bit;
  94
  95         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  96         if (bit < MAXKEY) {
  97                 set_bit(bit, agp_bridge->key_list);
  98                 return bit;
  99         }
 100         return -1;
 101 }
 102
 103
 104 struct agp_memory *agp_create_memory(int scratch_pages)
 105 {
 106         struct agp_memory *new;
 107
 108         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 109         if (new == NULL)
 110                 return NULL;
 111
 112         new->key = agp_get_key();
 113
 114         if (new->key < 0) {
 115                 kfree(new);
 116                 return NULL;
 117         }
 118         new->memory = vmalloc(PAGE_SIZE * scratch_pages);
 119
 120         if (new->memory == NULL) {
 121                 agp_free_key(new->key);
 122                 kfree(new);
 123                 return NULL;
 124         }
 125         new->num_scratch_pages = scratch_pages;
 126         return new;
 127 }
 128 EXPORT_SYMBOL(agp_create_memory);
 129
 130 /**
 131  *      agp_free_memory - free memory associated with an agp_memory pointer.
 132  *
 133  *      @curr:          agp_memory pointer to be freed.
 134  *
 135  *      It is the only function that can be called when the backend is not owned
 136  *      by the caller.  (So it can free memory on client death.)
 137  */
 138 void agp_free_memory(struct agp_memory *curr)
 139 {
 140         size_t i;
 141
 142         if (curr == NULL)
 143                 return;
 144
 145         if (curr->is_bound == TRUE)
 146                 agp_unbind_memory(curr);
 147
 148         if (curr->type != 0) {
 149                 curr->bridge->driver->free_by_type(curr);
 150                 return;
 151         }
 152         if (curr->page_count != 0) {
 153                 for (i = 0; i < curr->page_count; i++) {
 154                         curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
 155                 }
 156         }
 157         agp_free_key(curr->key);
 158         vfree(curr->memory);
 159         kfree(curr);
 160 }
 161 EXPORT_SYMBOL(agp_free_memory);
 162
 163 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 164
 165 /**
 166  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 167  *
 168  *      @page_count:    size_t argument of the number of pages
 169  *      @type:  u32 argument of the type of memory to be allocated.
 170  *
 171  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 172  *      maps to physical ram.  Any other type is device dependent.
 173  *
 174  *      It returns NULL whenever memory is unavailable.
 175  */
 176 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 177                                         size_t page_count, u32 type)
 178 {
 179         int scratch_pages;
 180         struct agp_memory *new;
 181         size_t i;
 182
 183         if (!bridge)
 184                 return NULL;
 185
 186         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
 187                 return NULL;
 188
 189         if (type != 0) {
 190                 new = bridge->driver->alloc_by_type(page_count, type);
 191                 if (new)
 192                         new->bridge = bridge;
 193                 return new;
 194         }
 195
 196         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 197
 198         new = agp_create_memory(scratch_pages);
 199
 200         if (new == NULL)
 201                 return NULL;
 202
 203         for (i = 0; i < page_count; i++) {
 204                 void *addr = bridge->driver->agp_alloc_page(bridge);
 205
 206                 if (addr == NULL) {
 207                         agp_free_memory(new);
 208                         return NULL;
 209                 }
 210                 new->memory[i] = virt_to_gart(addr);
 211                 new->page_count++;
 212         }
 213        new->bridge = bridge;
 214
 215         flush_agp_mappings();
 216
 217         return new;
 218 }
 219 EXPORT_SYMBOL(agp_allocate_memory);
 220
 221
 222 /* End - Generic routines for handling agp_memory structures */
 223
 224
 225 static int agp_return_size(void)
 226 {
 227         int current_size;
 228         void *temp;
 229
 230         temp = agp_bridge->current_size;
 231
 232         switch (agp_bridge->driver->size_type) {
 233         case U8_APER_SIZE:
 234                 current_size = A_SIZE_8(temp)->size;
 235                 break;
 236         case U16_APER_SIZE:
 237                 current_size = A_SIZE_16(temp)->size;
 238                 break;
 239         case U32_APER_SIZE:
 240                 current_size = A_SIZE_32(temp)->size;
 241                 break;
 242         case LVL2_APER_SIZE:
 243                 current_size = A_SIZE_LVL2(temp)->size;
 244                 break;
 245         case FIXED_APER_SIZE:
 246                 current_size = A_SIZE_FIX(temp)->size;
 247                 break;
 248         default:
 249                 current_size = 0;
 250                 break;
 251         }
 252
 253         current_size -= (agp_memory_reserved / (1024*1024));
 254         if (current_size <0)
 255                 current_size = 0;
 256         return current_size;
 257 }
 258
 259
 260 int agp_num_entries(void)
 261 {
 262         int num_entries;
 263         void *temp;
 264
 265         temp = agp_bridge->current_size;
 266
 267         switch (agp_bridge->driver->size_type) {
 268         case U8_APER_SIZE:
 269                 num_entries = A_SIZE_8(temp)->num_entries;
 270                 break;
 271         case U16_APER_SIZE:
 272                 num_entries = A_SIZE_16(temp)->num_entries;
 273                 break;
 274         case U32_APER_SIZE:
 275                 num_entries = A_SIZE_32(temp)->num_entries;
 276                 break;
 277         case LVL2_APER_SIZE:
 278                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 279                 break;
 280         case FIXED_APER_SIZE:
 281                 num_entries = A_SIZE_FIX(temp)->num_entries;
 282                 break;
 283         default:
 284                 num_entries = 0;
 285                 break;
 286         }
 287
 288         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 289         if (num_entries<0)
 290                 num_entries = 0;
 291         return num_entries;
 292 }
 293 EXPORT_SYMBOL_GPL(agp_num_entries);
 294
 295
 296 /**
 297  *      agp_copy_info  -  copy bridge state information
 298  *
 299  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 300  *
 301  *      This function copies information about the agp bridge device and the state of
 302  *      the agp backend into an agp_kern_info pointer.
 303  */
 304 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 305 {
 306         memset(info, 0, sizeof(struct agp_kern_info));
 307         if (!bridge) {
 308                 info->chipset = NOT_SUPPORTED;
 309                 return -EIO;
 310         }
 311
 312         info->version.major = bridge->version->major;
 313         info->version.minor = bridge->version->minor;
 314         info->chipset = SUPPORTED;
 315         info->device = bridge->dev;
 316         if (bridge->mode & AGPSTAT_MODE_3_0)
 317                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 318         else
 319                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 320         info->aper_base = bridge->gart_bus_addr;
 321         info->aper_size = agp_return_size();
 322         info->max_memory = bridge->max_memory_agp;
 323         info->current_memory = atomic_read(&bridge->current_memory_agp);
 324         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 325         info->vm_ops = bridge->vm_ops;
 326         info->page_mask = ~0UL;
 327         return 0;
 328 }
 329 EXPORT_SYMBOL(agp_copy_info);
 330
 331 /* End - Routine to copy over information structure */
 332
 333 /*
 334  * Routines for handling swapping of agp_memory into the GATT -
 335  * These routines take agp_memory and insert them into the GATT.
 336  * They call device specific routines to actually write to the GATT.
 337  */
 338
 339 /**
 340  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 341  *
 342  *      @curr:          agp_memory pointer
 343  *      @pg_start:      an offset into the graphics aperture translation table
 344  *
 345  *      It returns -EINVAL if the pointer == NULL.
 346  *      It returns -EBUSY if the area of the table requested is already in use.
 347  */
 348 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 349 {
 350         int ret_val;
 351
 352         if (curr == NULL)
 353                 return -EINVAL;
 354
 355         if (curr->is_bound == TRUE) {
 356                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
 357                 return -EINVAL;
 358         }
 359         if (curr->is_flushed == FALSE) {
 360                 curr->bridge->driver->cache_flush();
 361                 curr->is_flushed = TRUE;
 362         }
 363         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 364
 365         if (ret_val != 0)
 366                 return ret_val;
 367
 368         curr->is_bound = TRUE;
 369         curr->pg_start = pg_start;
 370         return 0;
 371 }
 372 EXPORT_SYMBOL(agp_bind_memory);
 373
 374
 375 /**
 376  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 377  *
 378  * @curr:       agp_memory pointer to be removed from the GATT.
 379  *
 380  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 381  * the graphics aperture translation table or if the agp_memory pointer == NULL
 382  */
 383 int agp_unbind_memory(struct agp_memory *curr)
 384 {
 385         int ret_val;
 386
 387         if (curr == NULL)
 388                 return -EINVAL;
 389
 390         if (curr->is_bound != TRUE) {
 391                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
 392                 return -EINVAL;
 393         }
 394
 395         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 396
 397         if (ret_val != 0)
 398                 return ret_val;
 399
 400         curr->is_bound = FALSE;
 401         curr->pg_start = 0;
 402         return 0;
 403 }
 404 EXPORT_SYMBOL(agp_unbind_memory);
 405
 406 /* End - Routines for handling swapping of agp_memory into the GATT */
 407
 408
 409 /* Generic Agp routines - Start */
 410 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 411 {
 412         u32 tmp;
 413
 414         if (*requested_mode & AGP2_RESERVED_MASK) {
 415                 printk(KERN_INFO PFX "reserved bits set in mode 0x%x. Fixed.\n", *requested_mode);
 416                 *requested_mode &= ~AGP2_RESERVED_MASK;
 417         }
 418
 419         /* Check the speed bits make sense. Only one should be set. */
 420         tmp = *requested_mode & 7;
 421         switch (tmp) {
 422                 case 0:
 423                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 424                         *requested_mode |= AGPSTAT2_1X;
 425                         break;
 426                 case 1:
 427                 case 2:
 428                         break;
 429                 case 3:
 430                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 431                         break;
 432                 case 4:
 433                         break;
 434                 case 5:
 435                 case 6:
 436                 case 7:
 437                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 438                         break;
 439         }
 440
 441         /* disable SBA if it's not supported */
 442         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 443                 *bridge_agpstat &= ~AGPSTAT_SBA;
 444
 445         /* Set rate */
 446         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 447                 *bridge_agpstat &= ~AGPSTAT2_4X;
 448
 449         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 450                 *bridge_agpstat &= ~AGPSTAT2_2X;
 451
 452         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 453                 *bridge_agpstat &= ~AGPSTAT2_1X;
 454
 455         /* Now we know what mode it should be, clear out the unwanted bits. */
 456         if (*bridge_agpstat & AGPSTAT2_4X)
 457                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 458
 459         if (*bridge_agpstat & AGPSTAT2_2X)
 460                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 461
 462         if (*bridge_agpstat & AGPSTAT2_1X)
 463                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 464
 465         /* Apply any errata. */
 466         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 467                 *bridge_agpstat &= ~AGPSTAT_FW;
 468
 469         if (agp_bridge->flags & AGP_ERRATA_SBA)
 470                 *bridge_agpstat &= ~AGPSTAT_SBA;
 471
 472         if (agp_bridge->flags & AGP_ERRATA_1X) {
 473                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 474                 *bridge_agpstat |= AGPSTAT2_1X;
 475         }
 476
 477         /* If we've dropped down to 1X, disable fast writes. */
 478         if (*bridge_agpstat & AGPSTAT2_1X)
 479                 *bridge_agpstat &= ~AGPSTAT_FW;
 480 }
 481
 482 /*
 483  * requested_mode = Mode requested by (typically) X.
 484  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 485  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 486  */
 487 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 488 {
 489         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 490         u32 tmp;
 491
 492         if (*requested_mode & AGP3_RESERVED_MASK) {
 493                 printk(KERN_INFO PFX "reserved bits set in mode 0x%x. Fixed.\n", *requested_mode);
 494                 *requested_mode &= ~AGP3_RESERVED_MASK;
 495         }
 496
 497         /* Check the speed bits make sense. */
 498         tmp = *requested_mode & 7;
 499         if (tmp == 0) {
 500                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 501                 *requested_mode |= AGPSTAT3_4X;
 502         }
 503         if (tmp >= 3) {
 504                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 505                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 506         }
 507
 508         /* ARQSZ - Set the value to the maximum one.
 509          * Don't allow the mode register to override values. */
 510         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 511                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 512
 513         /* Calibration cycle.
 514          * Don't allow the mode register to override values. */
 515         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 516                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 517
 518         /* SBA *must* be supported for AGP v3 */
 519         *bridge_agpstat |= AGPSTAT_SBA;
 520
 521         /*
 522          * Set speed.
 523          * Check for invalid speeds. This can happen when applications
 524          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 525          */
 526         if (*requested_mode & AGPSTAT_MODE_3_0) {
 527                 /*
 528                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 529                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 530                  * AGP2.x 4x -> AGP3.0 4x.
 531                  */
 532                 if (*requested_mode & AGPSTAT2_4X) {
 533                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 534                                                 current->comm, *requested_mode);
 535                         *requested_mode &= ~AGPSTAT2_4X;
 536                         *requested_mode |= AGPSTAT3_4X;
 537                 }
 538         } else {
 539                 /*
 540                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 541                  * but have been passed an AGP 2.x mode.
 542                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 543                  */
 544                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 545                                         current->comm, *requested_mode);
 546                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 547                 *requested_mode |= AGPSTAT3_4X;
 548         }
 549
 550         if (*requested_mode & AGPSTAT3_8X) {
 551                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 552                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 553                         *bridge_agpstat |= AGPSTAT3_4X;
 554                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
 555                         return;
 556                 }
 557                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 558                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 559                         *bridge_agpstat |= AGPSTAT3_4X;
 560                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
 561                         return;
 562                 }
 563                 /* All set, bridge & device can do AGP x8*/
 564                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 565                 goto done;
 566
 567         } else {
 568
 569                 /*
 570                  * If we didn't specify AGPx8, we can only do x4.
 571                  * If the hardware can't do x4, we're up shit creek, and never
 572                  *  should have got this far.
 573                  */
 574                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 575                 if ((*bridge_agpstat & AGPSTAT3_4X) && (*vga_agpstat & AGPSTAT3_4X))
 576                         *bridge_agpstat |= AGPSTAT3_4X;
 577                 else {
 578                         printk(KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
 579                                                         "[bridge_agpstat:%x vga_agpstat:%x fell back to:- bridge_agpstat:%x vga_agpstat:%x]\n",
 580                                                         origbridge, origvga, *bridge_agpstat, *vga_agpstat);
 581                         if (!(*bridge_agpstat & AGPSTAT3_4X))
 582                                 printk(KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
 583                         if (!(*vga_agpstat & AGPSTAT3_4X))
 584                                 printk(KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
 585                         return;
 586                 }
 587         }
 588
 589 done:
 590         /* Apply any errata. */
 591         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 592                 *bridge_agpstat &= ~AGPSTAT_FW;
 593
 594         if (agp_bridge->flags & AGP_ERRATA_SBA)
 595                 *bridge_agpstat &= ~AGPSTAT_SBA;
 596
 597         if (agp_bridge->flags & AGP_ERRATA_1X) {
 598                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 599                 *bridge_agpstat |= AGPSTAT2_1X;
 600         }
 601 }
 602
 603
 604 /**
 605  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 606  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 607  * @requested_mode: requested agp_stat from userspace (Typically from X)
 608  * @bridge_agpstat: current agp_stat from AGP bridge.
 609  *
 610  * This function will hunt for an AGP graphics card, and try to match
 611  * the requested mode to the capabilities of both the bridge and the card.
 612  */
 613 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 614 {
 615         struct pci_dev *device = NULL;
 616         u32 vga_agpstat;
 617         u8 cap_ptr;
 618
 619         for (;;) {
 620                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 621                 if (!device) {
 622                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 623                         return 0;
 624                 }
 625                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 626                 if (cap_ptr)
 627                         break;
 628         }
 629
 630         /*
 631          * Ok, here we have a AGP device. Disable impossible
 632          * settings, and adjust the readqueue to the minimum.
 633          */
 634         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 635
 636         /* adjust RQ depth */
 637         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 638              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 639                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 640
 641         /* disable FW if it's not supported */
 642         if (!((bridge_agpstat & AGPSTAT_FW) &&
 643                  (vga_agpstat & AGPSTAT_FW) &&
 644                  (requested_mode & AGPSTAT_FW)))
 645                 bridge_agpstat &= ~AGPSTAT_FW;
 646
 647         /* Check to see if we are operating in 3.0 mode */
 648         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 649                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 650         else
 651                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 652
 653         pci_dev_put(device);
 654         return bridge_agpstat;
 655 }
 656 EXPORT_SYMBOL(agp_collect_device_status);
 657
 658
 659 void agp_device_command(u32 bridge_agpstat, int agp_v3)
 660 {
 661         struct pci_dev *device = NULL;
 662         int mode;
 663
 664         mode = bridge_agpstat & 0x7;
 665         if (agp_v3)
 666                 mode *= 4;
 667
 668         for_each_pci_dev(device) {
 669                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 670                 if (!agp)
 671                         continue;
 672
 673                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
 674                                 agp_v3 ? 3 : 2, pci_name(device), mode);
 675                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 676         }
 677 }
 678 EXPORT_SYMBOL(agp_device_command);
 679
 680
 681 void get_agp_version(struct agp_bridge_data *bridge)
 682 {
 683         u32 ncapid;
 684
 685         /* Exit early if already set by errata workarounds. */
 686         if (bridge->major_version != 0)
 687                 return;
 688
 689         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 690         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 691         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 692 }
 693 EXPORT_SYMBOL(get_agp_version);
 694
 695
 696 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 697 {
 698         u32 bridge_agpstat, temp;
 699
 700         get_agp_version(agp_bridge);
 701
 702         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
 703                                 agp_bridge->major_version,
 704                                 agp_bridge->minor_version,
 705                                 pci_name(agp_bridge->dev));
 706
 707         pci_read_config_dword(agp_bridge->dev,
 708                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 709
 710         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 711         if (bridge_agpstat == 0)
 712                 /* Something bad happened. FIXME: Return error code? */
 713                 return;
 714
 715         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 716
 717         /* Do AGP version specific frobbing. */
 718         if (bridge->major_version >= 3) {
 719                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 720                         /* If we have 3.5, we can do the isoch stuff. */
 721                         if (bridge->minor_version >= 5)
 722                                 agp_3_5_enable(bridge);
 723                         agp_device_command(bridge_agpstat, TRUE);
 724                         return;
 725                 } else {
 726                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 727                     bridge_agpstat &= ~(7<<10) ;
 728                     pci_read_config_dword(bridge->dev,
 729                                         bridge->capndx+AGPCTRL, &temp);
 730                     temp |= (1<<9);
 731                     pci_write_config_dword(bridge->dev,
 732                                         bridge->capndx+AGPCTRL, temp);
 733
 734                     printk(KERN_INFO PFX "Device is in legacy mode,"
 735                                 " falling back to 2.x\n");
 736                 }
 737         }
 738
 739         /* AGP v<3 */
 740         agp_device_command(bridge_agpstat, FALSE);
 741 }
 742 EXPORT_SYMBOL(agp_generic_enable);
 743
 744
 745 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 746 {
 747         char *table;
 748         char *table_end;
 749         int size;
 750         int page_order;
 751         int num_entries;
 752         int i;
 753         void *temp;
 754         struct page *page;
 755
 756         /* The generic routines can't handle 2 level gatt's */
 757         if (bridge->driver->size_type == LVL2_APER_SIZE)
 758                 return -EINVAL;
 759
 760         table = NULL;
 761         i = bridge->aperture_size_idx;
 762         temp = bridge->current_size;
 763         size = page_order = num_entries = 0;
 764
 765         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 766                 do {
 767                         switch (bridge->driver->size_type) {
 768                         case U8_APER_SIZE:
 769                                 size = A_SIZE_8(temp)->size;
 770                                 page_order =
 771                                     A_SIZE_8(temp)->page_order;
 772                                 num_entries =
 773                                     A_SIZE_8(temp)->num_entries;
 774                                 break;
 775                         case U16_APER_SIZE:
 776                                 size = A_SIZE_16(temp)->size;
 777                                 page_order = A_SIZE_16(temp)->page_order;
 778                                 num_entries = A_SIZE_16(temp)->num_entries;
 779                                 break;
 780                         case U32_APER_SIZE:
 781                                 size = A_SIZE_32(temp)->size;
 782                                 page_order = A_SIZE_32(temp)->page_order;
 783                                 num_entries = A_SIZE_32(temp)->num_entries;
 784                                 break;
 785                                 /* This case will never really happen. */
 786                         case FIXED_APER_SIZE:
 787                         case LVL2_APER_SIZE:
 788                         default:
 789                                 size = page_order = num_entries = 0;
 790                                 break;
 791                         }
 792
 793                         table = alloc_gatt_pages(page_order);
 794
 795                         if (table == NULL) {
 796                                 i++;
 797                                 switch (bridge->driver->size_type) {
 798                                 case U8_APER_SIZE:
 799                                         bridge->current_size = A_IDX8(bridge);
 800                                         break;
 801                                 case U16_APER_SIZE:
 802                                         bridge->current_size = A_IDX16(bridge);
 803                                         break;
 804                                 case U32_APER_SIZE:
 805                                         bridge->current_size = A_IDX32(bridge);
 806                                         break;
 807                                         /* This case will never really happen. */
 808                                 case FIXED_APER_SIZE:
 809                                 case LVL2_APER_SIZE:
 810                                 default:
 811                                         bridge->current_size =
 812                                             bridge->current_size;
 813                                         break;
 814                                 }
 815                                 temp = bridge->current_size;
 816                         } else {
 817                                 bridge->aperture_size_idx = i;
 818                         }
 819                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 820         } else {
 821                 size = ((struct aper_size_info_fixed *) temp)->size;
 822                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 823                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 824                 table = alloc_gatt_pages(page_order);
 825         }
 826
 827         if (table == NULL)
 828                 return -ENOMEM;
 829
 830         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 831
 832         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 833                 SetPageReserved(page);
 834
 835         bridge->gatt_table_real = (u32 *) table;
 836         agp_gatt_table = (void *)table;
 837
 838         bridge->driver->cache_flush();
 839         bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
 840                                         (PAGE_SIZE * (1 << page_order)));
 841         bridge->driver->cache_flush();
 842
 843         if (bridge->gatt_table == NULL) {
 844                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 845                         ClearPageReserved(page);
 846
 847                 free_gatt_pages(table, page_order);
 848
 849                 return -ENOMEM;
 850         }
 851         bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
 852
 853         /* AK: bogus, should encode addresses > 4GB */
 854         for (i = 0; i < num_entries; i++) {
 855                 writel(bridge->scratch_page, bridge->gatt_table+i);
 856                 readl(bridge->gatt_table+i);    /* PCI Posting. */
 857         }
 858
 859         return 0;
 860 }
 861 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 862
 863 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
 864 {
 865         int page_order;
 866         char *table, *table_end;
 867         void *temp;
 868         struct page *page;
 869
 870         temp = bridge->current_size;
 871
 872         switch (bridge->driver->size_type) {
 873         case U8_APER_SIZE:
 874                 page_order = A_SIZE_8(temp)->page_order;
 875                 break;
 876         case U16_APER_SIZE:
 877                 page_order = A_SIZE_16(temp)->page_order;
 878                 break;
 879         case U32_APER_SIZE:
 880                 page_order = A_SIZE_32(temp)->page_order;
 881                 break;
 882         case FIXED_APER_SIZE:
 883                 page_order = A_SIZE_FIX(temp)->page_order;
 884                 break;
 885         case LVL2_APER_SIZE:
 886                 /* The generic routines can't deal with 2 level gatt's */
 887                 return -EINVAL;
 888                 break;
 889         default:
 890                 page_order = 0;
 891                 break;
 892         }
 893
 894         /* Do not worry about freeing memory, because if this is
 895          * called, then all agp memory is deallocated and removed
 896          * from the table. */
 897
 898         iounmap(bridge->gatt_table);
 899         table = (char *) bridge->gatt_table_real;
 900         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 901
 902         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 903                 ClearPageReserved(page);
 904
 905         free_gatt_pages(bridge->gatt_table_real, page_order);
 906
 907         agp_gatt_table = NULL;
 908         bridge->gatt_table = NULL;
 909         bridge->gatt_table_real = NULL;
 910         bridge->gatt_bus_addr = 0;
 911
 912         return 0;
 913 }
 914 EXPORT_SYMBOL(agp_generic_free_gatt_table);
 915
 916
 917 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
 918 {
 919         int num_entries;
 920         size_t i;
 921         off_t j;
 922         void *temp;
 923         struct agp_bridge_data *bridge;
 924
 925         bridge = mem->bridge;
 926         if (!bridge)
 927                 return -EINVAL;
 928
 929         temp = bridge->current_size;
 930
 931         switch (bridge->driver->size_type) {
 932         case U8_APER_SIZE:
 933                 num_entries = A_SIZE_8(temp)->num_entries;
 934                 break;
 935         case U16_APER_SIZE:
 936                 num_entries = A_SIZE_16(temp)->num_entries;
 937                 break;
 938         case U32_APER_SIZE:
 939                 num_entries = A_SIZE_32(temp)->num_entries;
 940                 break;
 941         case FIXED_APER_SIZE:
 942                 num_entries = A_SIZE_FIX(temp)->num_entries;
 943                 break;
 944         case LVL2_APER_SIZE:
 945                 /* The generic routines can't deal with 2 level gatt's */
 946                 return -EINVAL;
 947                 break;
 948         default:
 949                 num_entries = 0;
 950                 break;
 951         }
 952
 953         num_entries -= agp_memory_reserved/PAGE_SIZE;
 954         if (num_entries < 0) num_entries = 0;
 955
 956         if (type != 0 || mem->type != 0) {
 957                 /* The generic routines know nothing of memory types */
 958                 return -EINVAL;
 959         }
 960
 961         /* AK: could wrap */
 962         if ((pg_start + mem->page_count) > num_entries)
 963                 return -EINVAL;
 964
 965         j = pg_start;
 966
 967         while (j < (pg_start + mem->page_count)) {
 968                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
 969                         return -EBUSY;
 970                 j++;
 971         }
 972
 973         if (mem->is_flushed == FALSE) {
 974                 bridge->driver->cache_flush();
 975                 mem->is_flushed = TRUE;
 976         }
 977
 978         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 979                 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mem->type), bridge->gatt_table+j);
 980                 readl(bridge->gatt_table+j);    /* PCI Posting. */
 981         }
 982
 983         bridge->driver->tlb_flush(mem);
 984         return 0;
 985 }
 986 EXPORT_SYMBOL(agp_generic_insert_memory);
 987
 988
 989 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 990 {
 991         size_t i;
 992         struct agp_bridge_data *bridge;
 993
 994         bridge = mem->bridge;
 995         if (!bridge)
 996                 return -EINVAL;
 997
 998         if (type != 0 || mem->type != 0) {
 999                 /* The generic routines know nothing of memory types */
1000                 return -EINVAL;
1001         }
1002
1003         /* AK: bogus, should encode addresses > 4GB */
1004         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1005                 writel(bridge->scratch_page, bridge->gatt_table+i);
1006                 readl(bridge->gatt_table+i);    /* PCI Posting. */
1007         }
1008
1009         global_cache_flush();
1010         bridge->driver->tlb_flush(mem);
1011         return 0;
1012 }
1013 EXPORT_SYMBOL(agp_generic_remove_memory);
1014
1015
1016 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1017 {
1018         return NULL;
1019 }
1020 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1021
1022
1023 void agp_generic_free_by_type(struct agp_memory *curr)
1024 {
1025         vfree(curr->memory);
1026         agp_free_key(curr->key);
1027         kfree(curr);
1028 }
1029 EXPORT_SYMBOL(agp_generic_free_by_type);
1030
1031
1032 /*
1033  * Basic Page Allocation Routines -
1034  * These routines handle page allocation and by default they reserve the allocated
1035  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1036  * against a maximum value.
1037  */
1038
1039 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1040 {
1041         struct page * page;
1042
1043         page = alloc_page(GFP_KERNEL);
1044         if (page == NULL)
1045                 return NULL;
1046
1047         map_page_into_agp(page);
1048
1049         get_page(page);
1050         SetPageLocked(page);
1051         atomic_inc(&agp_bridge->current_memory_agp);
1052         return page_address(page);
1053 }
1054 EXPORT_SYMBOL(agp_generic_alloc_page);
1055
1056
1057 void agp_generic_destroy_page(void *addr)
1058 {
1059         struct page *page;
1060
1061         if (addr == NULL)
1062                 return;
1063
1064         page = virt_to_page(addr);
1065         unmap_page_from_agp(page);
1066         put_page(page);
1067         unlock_page(page);
1068         free_page((unsigned long)addr);
1069         atomic_dec(&agp_bridge->current_memory_agp);
1070 }
1071 EXPORT_SYMBOL(agp_generic_destroy_page);
1072
1073 /* End Basic Page Allocation Routines */
1074
1075
1076 /**
1077  * agp_enable  -  initialise the agp point-to-point connection.
1078  *
1079  * @mode:       agp mode register value to configure with.
1080  */
1081 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1082 {
1083         if (!bridge)
1084                 return;
1085         bridge->driver->agp_enable(bridge, mode);
1086 }
1087 EXPORT_SYMBOL(agp_enable);
1088
1089 /* When we remove the global variable agp_bridge from all drivers
1090  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1091  */
1092
1093 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1094 {
1095         if (list_empty(&agp_bridges))
1096                 return NULL;
1097
1098         return agp_bridge;
1099 }
1100
1101 static void ipi_handler(void *null)
1102 {
1103         flush_agp_cache();
1104 }
1105
1106 void global_cache_flush(void)
1107 {
1108         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1109                 panic(PFX "timed out waiting for the other CPUs!\n");
1110 }
1111 EXPORT_SYMBOL(global_cache_flush);
1112
1113 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1114         unsigned long addr, int type)
1115 {
1116         /* memory type is ignored in the generic routine */
1117         if (bridge->driver->masks)
1118                 return addr | bridge->driver->masks[0].mask;
1119         else
1120                 return addr;
1121 }
1122 EXPORT_SYMBOL(agp_generic_mask_memory);
1123
1124 /*
1125  * These functions are implemented according to the AGPv3 spec,
1126  * which covers implementation details that had previously been
1127  * left open.
1128  */
1129
1130 int agp3_generic_fetch_size(void)
1131 {
1132         u16 temp_size;
1133         int i;
1134         struct aper_size_info_16 *values;
1135
1136         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1137         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1138
1139         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1140                 if (temp_size == values[i].size_value) {
1141                         agp_bridge->previous_size =
1142                                 agp_bridge->current_size = (void *) (values + i);
1143
1144                         agp_bridge->aperture_size_idx = i;
1145                         return values[i].size;
1146                 }
1147         }
1148         return 0;
1149 }
1150 EXPORT_SYMBOL(agp3_generic_fetch_size);
1151
1152 void agp3_generic_tlbflush(struct agp_memory *mem)
1153 {
1154         u32 ctrl;
1155         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1156         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1157         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1158 }
1159 EXPORT_SYMBOL(agp3_generic_tlbflush);
1160
1161 int agp3_generic_configure(void)
1162 {
1163         u32 temp;
1164         struct aper_size_info_16 *current_size;
1165
1166         current_size = A_SIZE_16(agp_bridge->current_size);
1167
1168         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1169         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1170
1171         /* set aperture size */
1172         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1173         /* set gart pointer */
1174         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1175         /* enable aperture and GTLB */
1176         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1177         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1178         return 0;
1179 }
1180 EXPORT_SYMBOL(agp3_generic_configure);
1181
1182 void agp3_generic_cleanup(void)
1183 {
1184         u32 ctrl;
1185         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1186         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1187 }
1188 EXPORT_SYMBOL(agp3_generic_cleanup);
1189
1190 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1191 {
1192         {4096, 1048576, 10,0x000},
1193         {2048,  524288, 9, 0x800},
1194         {1024,  262144, 8, 0xc00},
1195         { 512,  131072, 7, 0xe00},
1196         { 256,   65536, 6, 0xf00},
1197         { 128,   32768, 5, 0xf20},
1198         {  64,   16384, 4, 0xf30},
1199         {  32,    8192, 3, 0xf38},
1200         {  16,    4096, 2, 0xf3c},
1201         {   8,    2048, 1, 0xf3e},
1202         {   4,    1024, 0, 0xf3f}
1203 };
1204 EXPORT_SYMBOL(agp3_generic_sizes);
1205