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 = kmalloc(sizeof(struct agp_memory), GFP_KERNEL);
 109
 110         if (new == NULL)
 111                 return NULL;
 112
 113         memset(new, 0, sizeof(struct agp_memory));
 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(phys_to_virt(curr->memory[i]));
 157                 }
 158         }
 159         agp_free_key(curr->key);
 160         vfree(curr->memory);
 161         kfree(curr);
 162 }
 163 EXPORT_SYMBOL(agp_free_memory);
 164
 165 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 166
 167 /**
 168  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 169  *
 170  *      @page_count:    size_t argument of the number of pages
 171  *      @type:  u32 argument of the type of memory to be allocated.
 172  *
 173  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 174  *      maps to physical ram.  Any other type is device dependent.
 175  *
 176  *      It returns NULL whenever memory is unavailable.
 177  */
 178 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 179                                         size_t page_count, u32 type)
 180 {
 181         int scratch_pages;
 182         struct agp_memory *new;
 183         size_t i;
 184
 185         if (!bridge)
 186                 return NULL;
 187
 188         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
 189                 return NULL;
 190
 191         if (type != 0) {
 192                 new = bridge->driver->alloc_by_type(page_count, type);
 193                 if (new)
 194                         new->bridge = bridge;
 195                 return new;
 196         }
 197
 198         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 199
 200         new = agp_create_memory(scratch_pages);
 201
 202         if (new == NULL)
 203                 return NULL;
 204
 205         for (i = 0; i < page_count; i++) {
 206                 void *addr = bridge->driver->agp_alloc_page(bridge);
 207
 208                 if (addr == NULL) {
 209                         agp_free_memory(new);
 210                         return NULL;
 211                 }
 212                 new->memory[i] = virt_to_phys(addr);
 213                 new->page_count++;
 214         }
 215        new->bridge = bridge;
 216
 217         flush_agp_mappings();
 218
 219         return new;
 220 }
 221 EXPORT_SYMBOL(agp_allocate_memory);
 222
 223
 224 /* End - Generic routines for handling agp_memory structures */
 225
 226
 227 static int agp_return_size(void)
 228 {
 229         int current_size;
 230         void *temp;
 231
 232         temp = agp_bridge->current_size;
 233
 234         switch (agp_bridge->driver->size_type) {
 235         case U8_APER_SIZE:
 236                 current_size = A_SIZE_8(temp)->size;
 237                 break;
 238         case U16_APER_SIZE:
 239                 current_size = A_SIZE_16(temp)->size;
 240                 break;
 241         case U32_APER_SIZE:
 242                 current_size = A_SIZE_32(temp)->size;
 243                 break;
 244         case LVL2_APER_SIZE:
 245                 current_size = A_SIZE_LVL2(temp)->size;
 246                 break;
 247         case FIXED_APER_SIZE:
 248                 current_size = A_SIZE_FIX(temp)->size;
 249                 break;
 250         default:
 251                 current_size = 0;
 252                 break;
 253         }
 254
 255         current_size -= (agp_memory_reserved / (1024*1024));
 256         if (current_size <0)
 257                 current_size = 0;
 258         return current_size;
 259 }
 260
 261
 262 int agp_num_entries(void)
 263 {
 264         int num_entries;
 265         void *temp;
 266
 267         temp = agp_bridge->current_size;
 268
 269         switch (agp_bridge->driver->size_type) {
 270         case U8_APER_SIZE:
 271                 num_entries = A_SIZE_8(temp)->num_entries;
 272                 break;
 273         case U16_APER_SIZE:
 274                 num_entries = A_SIZE_16(temp)->num_entries;
 275                 break;
 276         case U32_APER_SIZE:
 277                 num_entries = A_SIZE_32(temp)->num_entries;
 278                 break;
 279         case LVL2_APER_SIZE:
 280                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 281                 break;
 282         case FIXED_APER_SIZE:
 283                 num_entries = A_SIZE_FIX(temp)->num_entries;
 284                 break;
 285         default:
 286                 num_entries = 0;
 287                 break;
 288         }
 289
 290         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 291         if (num_entries<0)
 292                 num_entries = 0;
 293         return num_entries;
 294 }
 295 EXPORT_SYMBOL_GPL(agp_num_entries);
 296
 297
 298 static int check_bridge_mode(struct pci_dev *dev)
 299 {
 300         u32 agp3;
 301         u8 cap_ptr;
 302
 303         cap_ptr = pci_find_capability(dev, PCI_CAP_ID_AGP);
 304         pci_read_config_dword(dev, cap_ptr+AGPSTAT, &agp3);
 305         if (agp3 & AGPSTAT_MODE_3_0)
 306                 return 1;
 307         return 0;
 308 }
 309
 310
 311 /**
 312  *      agp_copy_info  -  copy bridge state information
 313  *
 314  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 315  *
 316  *      This function copies information about the agp bridge device and the state of
 317  *      the agp backend into an agp_kern_info pointer.
 318  */
 319 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 320 {
 321         memset(info, 0, sizeof(struct agp_kern_info));
 322         if (!bridge) {
 323                 info->chipset = NOT_SUPPORTED;
 324                 return -EIO;
 325         }
 326
 327         info->version.major = bridge->version->major;
 328         info->version.minor = bridge->version->minor;
 329         info->chipset = SUPPORTED;
 330         info->device = bridge->dev;
 331         if (check_bridge_mode(bridge->dev))
 332                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 333         else
 334                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 335         info->mode = bridge->mode;
 336         info->aper_base = bridge->gart_bus_addr;
 337         info->aper_size = agp_return_size();
 338         info->max_memory = bridge->max_memory_agp;
 339         info->current_memory = atomic_read(&bridge->current_memory_agp);
 340         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 341         info->vm_ops = bridge->vm_ops;
 342         info->page_mask = ~0UL;
 343         return 0;
 344 }
 345 EXPORT_SYMBOL(agp_copy_info);
 346
 347 /* End - Routine to copy over information structure */
 348
 349 /*
 350  * Routines for handling swapping of agp_memory into the GATT -
 351  * These routines take agp_memory and insert them into the GATT.
 352  * They call device specific routines to actually write to the GATT.
 353  */
 354
 355 /**
 356  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 357  *
 358  *      @curr:          agp_memory pointer
 359  *      @pg_start:      an offset into the graphics aperture translation table
 360  *
 361  *      It returns -EINVAL if the pointer == NULL.
 362  *      It returns -EBUSY if the area of the table requested is already in use.
 363  */
 364 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 365 {
 366         int ret_val;
 367
 368         if (curr == NULL)
 369                 return -EINVAL;
 370
 371         if (curr->is_bound == TRUE) {
 372                 printk (KERN_INFO PFX "memory %p is already bound!\n", curr);
 373                 return -EINVAL;
 374         }
 375         if (curr->is_flushed == FALSE) {
 376                 curr->bridge->driver->cache_flush();
 377                 curr->is_flushed = TRUE;
 378         }
 379         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 380
 381         if (ret_val != 0)
 382                 return ret_val;
 383
 384         curr->is_bound = TRUE;
 385         curr->pg_start = pg_start;
 386         return 0;
 387 }
 388 EXPORT_SYMBOL(agp_bind_memory);
 389
 390
 391 /**
 392  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 393  *
 394  * @curr:       agp_memory pointer to be removed from the GATT.
 395  *
 396  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 397  * the graphics aperture translation table or if the agp_memory pointer == NULL
 398  */
 399 int agp_unbind_memory(struct agp_memory *curr)
 400 {
 401         int ret_val;
 402
 403         if (curr == NULL)
 404                 return -EINVAL;
 405
 406         if (curr->is_bound != TRUE) {
 407                 printk (KERN_INFO PFX "memory %p was not bound!\n", curr);
 408                 return -EINVAL;
 409         }
 410
 411         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 412
 413         if (ret_val != 0)
 414                 return ret_val;
 415
 416         curr->is_bound = FALSE;
 417         curr->pg_start = 0;
 418         return 0;
 419 }
 420 EXPORT_SYMBOL(agp_unbind_memory);
 421
 422 /* End - Routines for handling swapping of agp_memory into the GATT */
 423
 424
 425 /* Generic Agp routines - Start */
 426 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 427 {
 428         u32 tmp;
 429
 430         if (*requested_mode & AGP2_RESERVED_MASK) {
 431                 printk (KERN_INFO PFX "reserved bits set in mode 0x%x. Fixed.\n", *requested_mode);
 432                 *requested_mode &= ~AGP2_RESERVED_MASK;
 433         }
 434
 435         /* Check the speed bits make sense. Only one should be set. */
 436         tmp = *requested_mode & 7;
 437         switch (tmp) {
 438                 case 0:
 439                         printk (KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 440                         *requested_mode |= AGPSTAT2_1X;
 441                         break;
 442                 case 1:
 443                 case 2:
 444                         break;
 445                 case 3:
 446                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 447                         break;
 448                 case 4:
 449                         break;
 450                 case 5:
 451                 case 6:
 452                 case 7:
 453                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 454                         break;
 455         }
 456
 457         /* disable SBA if it's not supported */
 458         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 459                 *bridge_agpstat &= ~AGPSTAT_SBA;
 460
 461         /* Set rate */
 462         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 463                 *bridge_agpstat &= ~AGPSTAT2_4X;
 464
 465         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 466                 *bridge_agpstat &= ~AGPSTAT2_2X;
 467
 468         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 469                 *bridge_agpstat &= ~AGPSTAT2_1X;
 470
 471         /* Now we know what mode it should be, clear out the unwanted bits. */
 472         if (*bridge_agpstat & AGPSTAT2_4X)
 473                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 474
 475         if (*bridge_agpstat & AGPSTAT2_2X)
 476                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 477
 478         if (*bridge_agpstat & AGPSTAT2_1X)
 479                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 480
 481         /* Apply any errata. */
 482         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 483                 *bridge_agpstat &= ~AGPSTAT_FW;
 484
 485         if (agp_bridge->flags & AGP_ERRATA_SBA)
 486                 *bridge_agpstat &= ~AGPSTAT_SBA;
 487
 488         if (agp_bridge->flags & AGP_ERRATA_1X) {
 489                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 490                 *bridge_agpstat |= AGPSTAT2_1X;
 491         }
 492
 493         /* If we've dropped down to 1X, disable fast writes. */
 494         if (*bridge_agpstat & AGPSTAT2_1X)
 495                 *bridge_agpstat &= ~AGPSTAT_FW;
 496 }
 497
 498 /*
 499  * requested_mode = Mode requested by (typically) X.
 500  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 501  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 502  */
 503 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 504 {
 505         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 506         u32 tmp;
 507
 508         if (*requested_mode & AGP3_RESERVED_MASK) {
 509                 printk (KERN_INFO PFX "reserved bits set in mode 0x%x. Fixed.\n", *requested_mode);
 510                 *requested_mode &= ~AGP3_RESERVED_MASK;
 511         }
 512
 513         /* Check the speed bits make sense. */
 514         tmp = *requested_mode & 7;
 515         if (tmp == 0) {
 516                 printk (KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 517                 *requested_mode |= AGPSTAT3_4X;
 518         }
 519         if (tmp >= 3) {
 520                 printk (KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 521                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 522         }
 523
 524         /* ARQSZ - Set the value to the maximum one.
 525          * Don't allow the mode register to override values. */
 526         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 527                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 528
 529         /* Calibration cycle.
 530          * Don't allow the mode register to override values. */
 531         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 532                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 533
 534         /* SBA *must* be supported for AGP v3 */
 535         *bridge_agpstat |= AGPSTAT_SBA;
 536
 537         /*
 538          * Set speed.
 539          * Check for invalid speeds. This can happen when applications
 540          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 541          */
 542         if (*requested_mode & AGPSTAT_MODE_3_0) {
 543                 /*
 544                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 545                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 546                  * AGP2.x 4x -> AGP3.0 4x.
 547                  */
 548                 if (*requested_mode & AGPSTAT2_4X) {
 549                         printk (KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 550                                                 current->comm, *requested_mode);
 551                         *requested_mode &= ~AGPSTAT2_4X;
 552                         *requested_mode |= AGPSTAT3_4X;
 553                 }
 554         } else {
 555                 /*
 556                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 557                  * but have been passed an AGP 2.x mode.
 558                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 559                  */
 560                 printk (KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 561                                         current->comm, *requested_mode);
 562                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 563                 *requested_mode |= AGPSTAT3_4X;
 564         }
 565
 566         if (*requested_mode & AGPSTAT3_8X) {
 567                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 568                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 569                         *bridge_agpstat |= AGPSTAT3_4X;
 570                         printk ("%s requested AGPx8 but bridge not capable.\n", current->comm);
 571                         return;
 572                 }
 573                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 574                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 575                         *bridge_agpstat |= AGPSTAT3_4X;
 576                         printk ("%s requested AGPx8 but graphic card not capable.\n", current->comm);
 577                         return;
 578                 }
 579                 /* All set, bridge & device can do AGP x8*/
 580                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 581                 goto done;
 582
 583         } else {
 584
 585                 /*
 586                  * If we didn't specify AGPx8, we can only do x4.
 587                  * If the hardware can't do x4, we're up shit creek, and never
 588                  *  should have got this far.
 589                  */
 590                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 591                 if ((*bridge_agpstat & AGPSTAT3_4X) && (*vga_agpstat & AGPSTAT3_4X))
 592                         *bridge_agpstat |= AGPSTAT3_4X;
 593                 else {
 594                         printk (KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
 595                                                         "[bridge_agpstat:%x vga_agpstat:%x fell back to:- bridge_agpstat:%x vga_agpstat:%x]\n",
 596                                                         origbridge, origvga, *bridge_agpstat, *vga_agpstat);
 597                         if (!(*bridge_agpstat & AGPSTAT3_4X))
 598                                 printk (KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
 599                         if (!(*vga_agpstat & AGPSTAT3_4X))
 600                                 printk (KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
 601                         return;
 602                 }
 603         }
 604
 605 done:
 606         /* Apply any errata. */
 607         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 608                 *bridge_agpstat &= ~AGPSTAT_FW;
 609
 610         if (agp_bridge->flags & AGP_ERRATA_SBA)
 611                 *bridge_agpstat &= ~AGPSTAT_SBA;
 612
 613         if (agp_bridge->flags & AGP_ERRATA_1X) {
 614                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 615                 *bridge_agpstat |= AGPSTAT2_1X;
 616         }
 617 }
 618
 619
 620 /**
 621  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 622  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 623  * @requested_mode: requested agp_stat from userspace (Typically from X)
 624  * @bridge_agpstat: current agp_stat from AGP bridge.
 625  *
 626  * This function will hunt for an AGP graphics card, and try to match
 627  * the requested mode to the capabilities of both the bridge and the card.
 628  */
 629 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 630 {
 631         struct pci_dev *device = NULL;
 632         u32 vga_agpstat;
 633         u8 cap_ptr;
 634
 635         for (;;) {
 636                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 637                 if (!device) {
 638                         printk (KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 639                         return 0;
 640                 }
 641                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 642                 if (cap_ptr)
 643                         break;
 644         }
 645
 646         /*
 647          * Ok, here we have a AGP device. Disable impossible
 648          * settings, and adjust the readqueue to the minimum.
 649          */
 650         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 651
 652         /* adjust RQ depth */
 653         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 654              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 655                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 656
 657         /* disable FW if it's not supported */
 658         if (!((bridge_agpstat & AGPSTAT_FW) &&
 659                  (vga_agpstat & AGPSTAT_FW) &&
 660                  (requested_mode & AGPSTAT_FW)))
 661                 bridge_agpstat &= ~AGPSTAT_FW;
 662
 663         /* Check to see if we are operating in 3.0 mode */
 664         if (check_bridge_mode(agp_bridge->dev))
 665                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 666         else
 667                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 668
 669         pci_dev_put(device);
 670         return bridge_agpstat;
 671 }
 672 EXPORT_SYMBOL(agp_collect_device_status);
 673
 674
 675 void agp_device_command(u32 bridge_agpstat, int agp_v3)
 676 {
 677         struct pci_dev *device = NULL;
 678         int mode;
 679
 680         mode = bridge_agpstat & 0x7;
 681         if (agp_v3)
 682                 mode *= 4;
 683
 684         for_each_pci_dev(device) {
 685                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 686                 if (!agp)
 687                         continue;
 688
 689                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
 690                                 agp_v3 ? 3 : 2, pci_name(device), mode);
 691                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 692         }
 693 }
 694 EXPORT_SYMBOL(agp_device_command);
 695
 696
 697 void get_agp_version(struct agp_bridge_data *bridge)
 698 {
 699         u32 ncapid;
 700
 701         /* Exit early if already set by errata workarounds. */
 702         if (bridge->major_version != 0)
 703                 return;
 704
 705         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 706         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 707         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 708 }
 709 EXPORT_SYMBOL(get_agp_version);
 710
 711
 712 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 713 {
 714         u32 bridge_agpstat, temp;
 715
 716         get_agp_version(agp_bridge);
 717
 718         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
 719                                 agp_bridge->major_version,
 720                                 agp_bridge->minor_version,
 721                                 pci_name(agp_bridge->dev));
 722
 723         pci_read_config_dword(agp_bridge->dev,
 724                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 725
 726         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 727         if (bridge_agpstat == 0)
 728                 /* Something bad happened. FIXME: Return error code? */
 729                 return;
 730
 731         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 732
 733         /* Do AGP version specific frobbing. */
 734         if (bridge->major_version >= 3) {
 735                 if (check_bridge_mode(bridge->dev)) {
 736                         /* If we have 3.5, we can do the isoch stuff. */
 737                         if (bridge->minor_version >= 5)
 738                                 agp_3_5_enable(bridge);
 739                         agp_device_command(bridge_agpstat, TRUE);
 740                         return;
 741                 } else {
 742                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 743                     bridge_agpstat &= ~(7<<10) ;
 744                     pci_read_config_dword(bridge->dev,
 745                                         bridge->capndx+AGPCTRL, &temp);
 746                     temp |= (1<<9);
 747                     pci_write_config_dword(bridge->dev,
 748                                         bridge->capndx+AGPCTRL, temp);
 749
 750                     printk (KERN_INFO PFX "Device is in legacy mode,"
 751                                 " falling back to 2.x\n");
 752                 }
 753         }
 754
 755         /* AGP v<3 */
 756         agp_device_command(bridge_agpstat, FALSE);
 757 }
 758 EXPORT_SYMBOL(agp_generic_enable);
 759
 760
 761 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 762 {
 763         char *table;
 764         char *table_end;
 765         int size;
 766         int page_order;
 767         int num_entries;
 768         int i;
 769         void *temp;
 770         struct page *page;
 771
 772         /* The generic routines can't handle 2 level gatt's */
 773         if (bridge->driver->size_type == LVL2_APER_SIZE)
 774                 return -EINVAL;
 775
 776         table = NULL;
 777         i = bridge->aperture_size_idx;
 778         temp = bridge->current_size;
 779         size = page_order = num_entries = 0;
 780
 781         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 782                 do {
 783                         switch (bridge->driver->size_type) {
 784                         case U8_APER_SIZE:
 785                                 size = A_SIZE_8(temp)->size;
 786                                 page_order =
 787                                     A_SIZE_8(temp)->page_order;
 788                                 num_entries =
 789                                     A_SIZE_8(temp)->num_entries;
 790                                 break;
 791                         case U16_APER_SIZE:
 792                                 size = A_SIZE_16(temp)->size;
 793                                 page_order = A_SIZE_16(temp)->page_order;
 794                                 num_entries = A_SIZE_16(temp)->num_entries;
 795                                 break;
 796                         case U32_APER_SIZE:
 797                                 size = A_SIZE_32(temp)->size;
 798                                 page_order = A_SIZE_32(temp)->page_order;
 799                                 num_entries = A_SIZE_32(temp)->num_entries;
 800                                 break;
 801                                 /* This case will never really happen. */
 802                         case FIXED_APER_SIZE:
 803                         case LVL2_APER_SIZE:
 804                         default:
 805                                 size = page_order = num_entries = 0;
 806                                 break;
 807                         }
 808
 809                         table = (char *) __get_free_pages(GFP_KERNEL,
 810                                                           page_order);
 811
 812                         if (table == NULL) {
 813                                 i++;
 814                                 switch (bridge->driver->size_type) {
 815                                 case U8_APER_SIZE:
 816                                         bridge->current_size = A_IDX8(bridge);
 817                                         break;
 818                                 case U16_APER_SIZE:
 819                                         bridge->current_size = A_IDX16(bridge);
 820                                         break;
 821                                 case U32_APER_SIZE:
 822                                         bridge->current_size = A_IDX32(bridge);
 823                                         break;
 824                                         /* This case will never really happen. */
 825                                 case FIXED_APER_SIZE:
 826                                 case LVL2_APER_SIZE:
 827                                 default:
 828                                         bridge->current_size =
 829                                             bridge->current_size;
 830                                         break;
 831                                 }
 832                                 temp = bridge->current_size;
 833                         } else {
 834                                 bridge->aperture_size_idx = i;
 835                         }
 836                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 837         } else {
 838                 size = ((struct aper_size_info_fixed *) temp)->size;
 839                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 840                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 841                 table = (char *) __get_free_pages(GFP_KERNEL, page_order);
 842         }
 843
 844         if (table == NULL)
 845                 return -ENOMEM;
 846
 847         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 848
 849         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 850                 SetPageReserved(page);
 851
 852         bridge->gatt_table_real = (u32 *) table;
 853         agp_gatt_table = (void *)table;
 854
 855         bridge->driver->cache_flush();
 856         bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
 857                                         (PAGE_SIZE * (1 << page_order)));
 858         bridge->driver->cache_flush();
 859
 860         if (bridge->gatt_table == NULL) {
 861                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 862                         ClearPageReserved(page);
 863
 864                 free_pages((unsigned long) table, page_order);
 865
 866                 return -ENOMEM;
 867         }
 868         bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
 869
 870         /* AK: bogus, should encode addresses > 4GB */
 871         for (i = 0; i < num_entries; i++) {
 872                 writel(bridge->scratch_page, bridge->gatt_table+i);
 873                 readl(bridge->gatt_table+i);    /* PCI Posting. */
 874         }
 875
 876         return 0;
 877 }
 878 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 879
 880 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
 881 {
 882         int page_order;
 883         char *table, *table_end;
 884         void *temp;
 885         struct page *page;
 886
 887         temp = bridge->current_size;
 888
 889         switch (bridge->driver->size_type) {
 890         case U8_APER_SIZE:
 891                 page_order = A_SIZE_8(temp)->page_order;
 892                 break;
 893         case U16_APER_SIZE:
 894                 page_order = A_SIZE_16(temp)->page_order;
 895                 break;
 896         case U32_APER_SIZE:
 897                 page_order = A_SIZE_32(temp)->page_order;
 898                 break;
 899         case FIXED_APER_SIZE:
 900                 page_order = A_SIZE_FIX(temp)->page_order;
 901                 break;
 902         case LVL2_APER_SIZE:
 903                 /* The generic routines can't deal with 2 level gatt's */
 904                 return -EINVAL;
 905                 break;
 906         default:
 907                 page_order = 0;
 908                 break;
 909         }
 910
 911         /* Do not worry about freeing memory, because if this is
 912          * called, then all agp memory is deallocated and removed
 913          * from the table. */
 914
 915         iounmap(bridge->gatt_table);
 916         table = (char *) bridge->gatt_table_real;
 917         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 918
 919         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 920                 ClearPageReserved(page);
 921
 922         free_pages((unsigned long) bridge->gatt_table_real, page_order);
 923
 924         agp_gatt_table = NULL;
 925         bridge->gatt_table = NULL;
 926         bridge->gatt_table_real = NULL;
 927         bridge->gatt_bus_addr = 0;
 928
 929         return 0;
 930 }
 931 EXPORT_SYMBOL(agp_generic_free_gatt_table);
 932
 933
 934 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
 935 {
 936         int num_entries;
 937         size_t i;
 938         off_t j;
 939         void *temp;
 940         struct agp_bridge_data *bridge;
 941
 942         bridge = mem->bridge;
 943         if (!bridge)
 944                 return -EINVAL;
 945
 946         temp = bridge->current_size;
 947
 948         switch (bridge->driver->size_type) {
 949         case U8_APER_SIZE:
 950                 num_entries = A_SIZE_8(temp)->num_entries;
 951                 break;
 952         case U16_APER_SIZE:
 953                 num_entries = A_SIZE_16(temp)->num_entries;
 954                 break;
 955         case U32_APER_SIZE:
 956                 num_entries = A_SIZE_32(temp)->num_entries;
 957                 break;
 958         case FIXED_APER_SIZE:
 959                 num_entries = A_SIZE_FIX(temp)->num_entries;
 960                 break;
 961         case LVL2_APER_SIZE:
 962                 /* The generic routines can't deal with 2 level gatt's */
 963                 return -EINVAL;
 964                 break;
 965         default:
 966                 num_entries = 0;
 967                 break;
 968         }
 969
 970         num_entries -= agp_memory_reserved/PAGE_SIZE;
 971         if (num_entries < 0) num_entries = 0;
 972
 973         if (type != 0 || mem->type != 0) {
 974                 /* The generic routines know nothing of memory types */
 975                 return -EINVAL;
 976         }
 977
 978         /* AK: could wrap */
 979         if ((pg_start + mem->page_count) > num_entries)
 980                 return -EINVAL;
 981
 982         j = pg_start;
 983
 984         while (j < (pg_start + mem->page_count)) {
 985                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
 986                         return -EBUSY;
 987                 j++;
 988         }
 989
 990         if (mem->is_flushed == FALSE) {
 991                 bridge->driver->cache_flush();
 992                 mem->is_flushed = TRUE;
 993         }
 994
 995         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 996                 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mem->type), bridge->gatt_table+j);
 997                 readl(bridge->gatt_table+j);    /* PCI Posting. */
 998         }
 999
1000         bridge->driver->tlb_flush(mem);
1001         return 0;
1002 }
1003 EXPORT_SYMBOL(agp_generic_insert_memory);
1004
1005
1006 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1007 {
1008         size_t i;
1009         struct agp_bridge_data *bridge;
1010
1011         bridge = mem->bridge;
1012         if (!bridge)
1013                 return -EINVAL;
1014
1015         if (type != 0 || mem->type != 0) {
1016                 /* The generic routines know nothing of memory types */
1017                 return -EINVAL;
1018         }
1019
1020         /* AK: bogus, should encode addresses > 4GB */
1021         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1022                 writel(bridge->scratch_page, bridge->gatt_table+i);
1023                 readl(bridge->gatt_table+i);    /* PCI Posting. */
1024         }
1025
1026         global_cache_flush();
1027         bridge->driver->tlb_flush(mem);
1028         return 0;
1029 }
1030 EXPORT_SYMBOL(agp_generic_remove_memory);
1031
1032
1033 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1034 {
1035         return NULL;
1036 }
1037 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1038
1039
1040 void agp_generic_free_by_type(struct agp_memory *curr)
1041 {
1042         vfree(curr->memory);
1043         agp_free_key(curr->key);
1044         kfree(curr);
1045 }
1046 EXPORT_SYMBOL(agp_generic_free_by_type);
1047
1048
1049 /*
1050  * Basic Page Allocation Routines -
1051  * These routines handle page allocation and by default they reserve the allocated
1052  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1053  * against a maximum value.
1054  */
1055
1056 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1057 {
1058         struct page * page;
1059
1060         page = alloc_page(GFP_KERNEL);
1061         if (page == NULL)
1062                 return NULL;
1063
1064         map_page_into_agp(page);
1065
1066         get_page(page);
1067         SetPageLocked(page);
1068         atomic_inc(&agp_bridge->current_memory_agp);
1069         return page_address(page);
1070 }
1071 EXPORT_SYMBOL(agp_generic_alloc_page);
1072
1073
1074 void agp_generic_destroy_page(void *addr)
1075 {
1076         struct page *page;
1077
1078         if (addr == NULL)
1079                 return;
1080
1081         page = virt_to_page(addr);
1082         unmap_page_from_agp(page);
1083         put_page(page);
1084         unlock_page(page);
1085         free_page((unsigned long)addr);
1086         atomic_dec(&agp_bridge->current_memory_agp);
1087 }
1088 EXPORT_SYMBOL(agp_generic_destroy_page);
1089
1090 /* End Basic Page Allocation Routines */
1091
1092
1093 /**
1094  * agp_enable  -  initialise the agp point-to-point connection.
1095  *
1096  * @mode:       agp mode register value to configure with.
1097  */
1098 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1099 {
1100         if (!bridge)
1101                 return;
1102         bridge->driver->agp_enable(bridge, mode);
1103 }
1104 EXPORT_SYMBOL(agp_enable);
1105
1106 /* When we remove the global variable agp_bridge from all drivers
1107  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1108  */
1109
1110 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1111 {
1112         if (list_empty(&agp_bridges))
1113                 return NULL;
1114
1115         return agp_bridge;
1116 }
1117
1118 static void ipi_handler(void *null)
1119 {
1120         flush_agp_cache();
1121 }
1122
1123 void global_cache_flush(void)
1124 {
1125         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1126                 panic(PFX "timed out waiting for the other CPUs!\n");
1127 }
1128 EXPORT_SYMBOL(global_cache_flush);
1129
1130 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1131         unsigned long addr, int type)
1132 {
1133         /* memory type is ignored in the generic routine */
1134         if (bridge->driver->masks)
1135                 return addr | bridge->driver->masks[0].mask;
1136         else
1137                 return addr;
1138 }
1139 EXPORT_SYMBOL(agp_generic_mask_memory);
1140
1141 /*
1142  * These functions are implemented according to the AGPv3 spec,
1143  * which covers implementation details that had previously been
1144  * left open.
1145  */
1146
1147 int agp3_generic_fetch_size(void)
1148 {
1149         u16 temp_size;
1150         int i;
1151         struct aper_size_info_16 *values;
1152
1153         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1154         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1155
1156         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1157                 if (temp_size == values[i].size_value) {
1158                         agp_bridge->previous_size =
1159                                 agp_bridge->current_size = (void *) (values + i);
1160
1161                         agp_bridge->aperture_size_idx = i;
1162                         return values[i].size;
1163                 }
1164         }
1165         return 0;
1166 }
1167 EXPORT_SYMBOL(agp3_generic_fetch_size);
1168
1169 void agp3_generic_tlbflush(struct agp_memory *mem)
1170 {
1171         u32 ctrl;
1172         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1173         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1174         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1175 }
1176 EXPORT_SYMBOL(agp3_generic_tlbflush);
1177
1178 int agp3_generic_configure(void)
1179 {
1180         u32 temp;
1181         struct aper_size_info_16 *current_size;
1182
1183         current_size = A_SIZE_16(agp_bridge->current_size);
1184
1185         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1186         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1187
1188         /* set aperture size */
1189         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1190         /* set gart pointer */
1191         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1192         /* enable aperture and GTLB */
1193         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1194         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1195         return 0;
1196 }
1197 EXPORT_SYMBOL(agp3_generic_configure);
1198
1199 void agp3_generic_cleanup(void)
1200 {
1201         u32 ctrl;
1202         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1203         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1204 }
1205 EXPORT_SYMBOL(agp3_generic_cleanup);
1206
1207 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1208 {
1209         {4096, 1048576, 10,0x000},
1210         {2048,  524288, 9, 0x800},
1211         {1024,  262144, 8, 0xc00},
1212         { 512,  131072, 7, 0xe00},
1213         { 256,   65536, 6, 0xf00},
1214         { 128,   32768, 5, 0xf20},
1215         {  64,   16384, 4, 0xf30},
1216         {  32,    8192, 3, 0xf38},
1217         {  16,    4096, 2, 0xf3c},
1218         {   8,    2048, 1, 0xf3e},
1219         {   4,    1024, 0, 0xf3f}
1220 };
1221 EXPORT_SYMBOL(agp3_generic_sizes);
1222