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1/*
2 * AGPGART driver.
3 * Copyright (C) 2004 Silicon Graphics, Inc.
4 * Copyright (C) 2002-2005 Dave Jones.
5 * Copyright (C) 1999 Jeff Hartmann.
6 * Copyright (C) 1999 Precision Insight, Inc.
7 * Copyright (C) 1999 Xi Graphics, Inc.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
25 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * TODO:
28 * - Allocate more than order 0 pages to avoid too much linear map splitting.
29 */
30#include <linux/module.h>
31#include <linux/pci.h>
32#include <linux/init.h>
33#include <linux/pagemap.h>
34#include <linux/miscdevice.h>
35#include <linux/pm.h>
36#include <linux/agp_backend.h>
37#include <linux/vmalloc.h>
38#include <linux/dma-mapping.h>
39#include <linux/mm.h>
40#include <linux/sched.h>
41#include <linux/slab.h>
42#include <asm/io.h>
43#include <asm/cacheflush.h>
44#include <asm/pgtable.h>
45#include "agp.h"
46
47__u32 *agp_gatt_table;
48int agp_memory_reserved;
49
50/*
51 * Needed by the Nforce GART driver for the time being. Would be
52 * nice to do this some other way instead of needing this export.
53 */
54EXPORT_SYMBOL_GPL(agp_memory_reserved);
55
56/*
57 * Generic routines for handling agp_memory structures -
58 * They use the basic page allocation routines to do the brunt of the work.
59 */
60
61void agp_free_key(int key)
62{
63 if (key < 0)
64 return;
65
66 if (key < MAXKEY)
67 clear_bit(key, agp_bridge->key_list);
68}
69EXPORT_SYMBOL(agp_free_key);
70
71
72static int agp_get_key(void)
73{
74 int bit;
75
76 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
77 if (bit < MAXKEY) {
78 set_bit(bit, agp_bridge->key_list);
79 return bit;
80 }
81 return -1;
82}
83
84/*
85 * Use kmalloc if possible for the page list. Otherwise fall back to
86 * vmalloc. This speeds things up and also saves memory for small AGP
87 * regions.
88 */
89
90void agp_alloc_page_array(size_t size, struct agp_memory *mem)
91{
92 mem->pages = NULL;
93
94 if (size <= 2*PAGE_SIZE)
95 mem->pages = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
96 if (mem->pages == NULL) {
97 mem->pages = vmalloc(size);
98 }
99}
100EXPORT_SYMBOL(agp_alloc_page_array);
101
102void agp_free_page_array(struct agp_memory *mem)
103{
104 if (is_vmalloc_addr(mem->pages)) {
105 vfree(mem->pages);
106 } else {
107 kfree(mem->pages);
108 }
109}
110EXPORT_SYMBOL(agp_free_page_array);
111
112
113static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
114{
115 struct agp_memory *new;
116 unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
117
118 if (INT_MAX/sizeof(struct page *) < num_agp_pages)
119 return NULL;
120
121 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
122 if (new == NULL)
123 return NULL;
124
125 new->key = agp_get_key();
126
127 if (new->key < 0) {
128 kfree(new);
129 return NULL;
130 }
131
132 agp_alloc_page_array(alloc_size, new);
133
134 if (new->pages == NULL) {
135 agp_free_key(new->key);
136 kfree(new);
137 return NULL;
138 }
139 new->num_scratch_pages = 0;
140 return new;
141}
142
143struct agp_memory *agp_create_memory(int scratch_pages)
144{
145 struct agp_memory *new;
146
147 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
148 if (new == NULL)
149 return NULL;
150
151 new->key = agp_get_key();
152
153 if (new->key < 0) {
154 kfree(new);
155 return NULL;
156 }
157
158 agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
159
160 if (new->pages == NULL) {
161 agp_free_key(new->key);
162 kfree(new);
163 return NULL;
164 }
165 new->num_scratch_pages = scratch_pages;
166 new->type = AGP_NORMAL_MEMORY;
167 return new;
168}
169EXPORT_SYMBOL(agp_create_memory);
170
171/**
172 * agp_free_memory - free memory associated with an agp_memory pointer.
173 *
174 * @curr: agp_memory pointer to be freed.
175 *
176 * It is the only function that can be called when the backend is not owned
177 * by the caller. (So it can free memory on client death.)
178 */
179void agp_free_memory(struct agp_memory *curr)
180{
181 size_t i;
182
183 if (curr == NULL)
184 return;
185
186 if (curr->is_bound)
187 agp_unbind_memory(curr);
188
189 if (curr->type >= AGP_USER_TYPES) {
190 agp_generic_free_by_type(curr);
191 return;
192 }
193
194 if (curr->type != 0) {
195 curr->bridge->driver->free_by_type(curr);
196 return;
197 }
198 if (curr->page_count != 0) {
199 if (curr->bridge->driver->agp_destroy_pages) {
200 curr->bridge->driver->agp_destroy_pages(curr);
201 } else {
202
203 for (i = 0; i < curr->page_count; i++) {
204 curr->bridge->driver->agp_destroy_page(
205 curr->pages[i],
206 AGP_PAGE_DESTROY_UNMAP);
207 }
208 for (i = 0; i < curr->page_count; i++) {
209 curr->bridge->driver->agp_destroy_page(
210 curr->pages[i],
211 AGP_PAGE_DESTROY_FREE);
212 }
213 }
214 }
215 agp_free_key(curr->key);
216 agp_free_page_array(curr);
217 kfree(curr);
218}
219EXPORT_SYMBOL(agp_free_memory);
220
221#define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
222
223/**
224 * agp_allocate_memory - allocate a group of pages of a certain type.
225 *
226 * @page_count: size_t argument of the number of pages
227 * @type: u32 argument of the type of memory to be allocated.
228 *
229 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
230 * maps to physical ram. Any other type is device dependent.
231 *
232 * It returns NULL whenever memory is unavailable.
233 */
234struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
235 size_t page_count, u32 type)
236{
237 int scratch_pages;
238 struct agp_memory *new;
239 size_t i;
240 int cur_memory;
241
242 if (!bridge)
243 return NULL;
244
245 cur_memory = atomic_read(&bridge->current_memory_agp);
246 if ((cur_memory + page_count > bridge->max_memory_agp) ||
247 (cur_memory + page_count < page_count))
248 return NULL;
249
250 if (type >= AGP_USER_TYPES) {
251 new = agp_generic_alloc_user(page_count, type);
252 if (new)
253 new->bridge = bridge;
254 return new;
255 }
256
257 if (type != 0) {
258 new = bridge->driver->alloc_by_type(page_count, type);
259 if (new)
260 new->bridge = bridge;
261 return new;
262 }
263
264 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
265
266 new = agp_create_memory(scratch_pages);
267
268 if (new == NULL)
269 return NULL;
270
271 if (bridge->driver->agp_alloc_pages) {
272 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
273 agp_free_memory(new);
274 return NULL;
275 }
276 new->bridge = bridge;
277 return new;
278 }
279
280 for (i = 0; i < page_count; i++) {
281 struct page *page = bridge->driver->agp_alloc_page(bridge);
282
283 if (page == NULL) {
284 agp_free_memory(new);
285 return NULL;
286 }
287 new->pages[i] = page;
288 new->page_count++;
289 }
290 new->bridge = bridge;
291
292 return new;
293}
294EXPORT_SYMBOL(agp_allocate_memory);
295
296
297/* End - Generic routines for handling agp_memory structures */
298
299
300static int agp_return_size(void)
301{
302 int current_size;
303 void *temp;
304
305 temp = agp_bridge->current_size;
306
307 switch (agp_bridge->driver->size_type) {
308 case U8_APER_SIZE:
309 current_size = A_SIZE_8(temp)->size;
310 break;
311 case U16_APER_SIZE:
312 current_size = A_SIZE_16(temp)->size;
313 break;
314 case U32_APER_SIZE:
315 current_size = A_SIZE_32(temp)->size;
316 break;
317 case LVL2_APER_SIZE:
318 current_size = A_SIZE_LVL2(temp)->size;
319 break;
320 case FIXED_APER_SIZE:
321 current_size = A_SIZE_FIX(temp)->size;
322 break;
323 default:
324 current_size = 0;
325 break;
326 }
327
328 current_size -= (agp_memory_reserved / (1024*1024));
329 if (current_size <0)
330 current_size = 0;
331 return current_size;
332}
333
334
335int agp_num_entries(void)
336{
337 int num_entries;
338 void *temp;
339
340 temp = agp_bridge->current_size;
341
342 switch (agp_bridge->driver->size_type) {
343 case U8_APER_SIZE:
344 num_entries = A_SIZE_8(temp)->num_entries;
345 break;
346 case U16_APER_SIZE:
347 num_entries = A_SIZE_16(temp)->num_entries;
348 break;
349 case U32_APER_SIZE:
350 num_entries = A_SIZE_32(temp)->num_entries;
351 break;
352 case LVL2_APER_SIZE:
353 num_entries = A_SIZE_LVL2(temp)->num_entries;
354 break;
355 case FIXED_APER_SIZE:
356 num_entries = A_SIZE_FIX(temp)->num_entries;
357 break;
358 default:
359 num_entries = 0;
360 break;
361 }
362
363 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
364 if (num_entries<0)
365 num_entries = 0;
366 return num_entries;
367}
368EXPORT_SYMBOL_GPL(agp_num_entries);
369
370
371/**
372 * agp_copy_info - copy bridge state information
373 *
374 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
375 *
376 * This function copies information about the agp bridge device and the state of
377 * the agp backend into an agp_kern_info pointer.
378 */
379int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
380{
381 memset(info, 0, sizeof(struct agp_kern_info));
382 if (!bridge) {
383 info->chipset = NOT_SUPPORTED;
384 return -EIO;
385 }
386
387 info->version.major = bridge->version->major;
388 info->version.minor = bridge->version->minor;
389 info->chipset = SUPPORTED;
390 info->device = bridge->dev;
391 if (bridge->mode & AGPSTAT_MODE_3_0)
392 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
393 else
394 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
395 info->aper_base = bridge->gart_bus_addr;
396 info->aper_size = agp_return_size();
397 info->max_memory = bridge->max_memory_agp;
398 info->current_memory = atomic_read(&bridge->current_memory_agp);
399 info->cant_use_aperture = bridge->driver->cant_use_aperture;
400 info->vm_ops = bridge->vm_ops;
401 info->page_mask = ~0UL;
402 return 0;
403}
404EXPORT_SYMBOL(agp_copy_info);
405
406/* End - Routine to copy over information structure */
407
408/*
409 * Routines for handling swapping of agp_memory into the GATT -
410 * These routines take agp_memory and insert them into the GATT.
411 * They call device specific routines to actually write to the GATT.
412 */
413
414/**
415 * agp_bind_memory - Bind an agp_memory structure into the GATT.
416 *
417 * @curr: agp_memory pointer
418 * @pg_start: an offset into the graphics aperture translation table
419 *
420 * It returns -EINVAL if the pointer == NULL.
421 * It returns -EBUSY if the area of the table requested is already in use.
422 */
423int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
424{
425 int ret_val;
426
427 if (curr == NULL)
428 return -EINVAL;
429
430 if (curr->is_bound) {
431 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
432 return -EINVAL;
433 }
434 if (!curr->is_flushed) {
435 curr->bridge->driver->cache_flush();
436 curr->is_flushed = true;
437 }
438
439 ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
440
441 if (ret_val != 0)
442 return ret_val;
443
444 curr->is_bound = true;
445 curr->pg_start = pg_start;
446 spin_lock(&agp_bridge->mapped_lock);
447 list_add(&curr->mapped_list, &agp_bridge->mapped_list);
448 spin_unlock(&agp_bridge->mapped_lock);
449
450 return 0;
451}
452EXPORT_SYMBOL(agp_bind_memory);
453
454
455/**
456 * agp_unbind_memory - Removes an agp_memory structure from the GATT
457 *
458 * @curr: agp_memory pointer to be removed from the GATT.
459 *
460 * It returns -EINVAL if this piece of agp_memory is not currently bound to
461 * the graphics aperture translation table or if the agp_memory pointer == NULL
462 */
463int agp_unbind_memory(struct agp_memory *curr)
464{
465 int ret_val;
466
467 if (curr == NULL)
468 return -EINVAL;
469
470 if (!curr->is_bound) {
471 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
472 return -EINVAL;
473 }
474
475 ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
476
477 if (ret_val != 0)
478 return ret_val;
479
480 curr->is_bound = false;
481 curr->pg_start = 0;
482 spin_lock(&curr->bridge->mapped_lock);
483 list_del(&curr->mapped_list);
484 spin_unlock(&curr->bridge->mapped_lock);
485 return 0;
486}
487EXPORT_SYMBOL(agp_unbind_memory);
488
489
490/* End - Routines for handling swapping of agp_memory into the GATT */
491
492
493/* Generic Agp routines - Start */
494static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
495{
496 u32 tmp;
497
498 if (*requested_mode & AGP2_RESERVED_MASK) {
499 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
500 *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
501 *requested_mode &= ~AGP2_RESERVED_MASK;
502 }
503
504 /*
505 * Some dumb bridges are programmed to disobey the AGP2 spec.
506 * This is likely a BIOS misprogramming rather than poweron default, or
507 * it would be a lot more common.
508 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
509 * AGPv2 spec 6.1.9 states:
510 * The RATE field indicates the data transfer rates supported by this
511 * device. A.G.P. devices must report all that apply.
512 * Fix them up as best we can.
513 */
514 switch (*bridge_agpstat & 7) {
515 case 4:
516 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
517 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
518 "Fixing up support for x2 & x1\n");
519 break;
520 case 2:
521 *bridge_agpstat |= AGPSTAT2_1X;
522 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
523 "Fixing up support for x1\n");
524 break;
525 default:
526 break;
527 }
528
529 /* Check the speed bits make sense. Only one should be set. */
530 tmp = *requested_mode & 7;
531 switch (tmp) {
532 case 0:
533 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
534 *requested_mode |= AGPSTAT2_1X;
535 break;
536 case 1:
537 case 2:
538 break;
539 case 3:
540 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
541 break;
542 case 4:
543 break;
544 case 5:
545 case 6:
546 case 7:
547 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
548 break;
549 }
550
551 /* disable SBA if it's not supported */
552 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
553 *bridge_agpstat &= ~AGPSTAT_SBA;
554
555 /* Set rate */
556 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
557 *bridge_agpstat &= ~AGPSTAT2_4X;
558
559 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
560 *bridge_agpstat &= ~AGPSTAT2_2X;
561
562 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
563 *bridge_agpstat &= ~AGPSTAT2_1X;
564
565 /* Now we know what mode it should be, clear out the unwanted bits. */
566 if (*bridge_agpstat & AGPSTAT2_4X)
567 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
568
569 if (*bridge_agpstat & AGPSTAT2_2X)
570 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
571
572 if (*bridge_agpstat & AGPSTAT2_1X)
573 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
574
575 /* Apply any errata. */
576 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
577 *bridge_agpstat &= ~AGPSTAT_FW;
578
579 if (agp_bridge->flags & AGP_ERRATA_SBA)
580 *bridge_agpstat &= ~AGPSTAT_SBA;
581
582 if (agp_bridge->flags & AGP_ERRATA_1X) {
583 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
584 *bridge_agpstat |= AGPSTAT2_1X;
585 }
586
587 /* If we've dropped down to 1X, disable fast writes. */
588 if (*bridge_agpstat & AGPSTAT2_1X)
589 *bridge_agpstat &= ~AGPSTAT_FW;
590}
591
592/*
593 * requested_mode = Mode requested by (typically) X.
594 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
595 * vga_agpstat = PCI_AGP_STATUS from graphic card.
596 */
597static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
598{
599 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
600 u32 tmp;
601
602 if (*requested_mode & AGP3_RESERVED_MASK) {
603 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
604 *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
605 *requested_mode &= ~AGP3_RESERVED_MASK;
606 }
607
608 /* Check the speed bits make sense. */
609 tmp = *requested_mode & 7;
610 if (tmp == 0) {
611 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
612 *requested_mode |= AGPSTAT3_4X;
613 }
614 if (tmp >= 3) {
615 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
616 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
617 }
618
619 /* ARQSZ - Set the value to the maximum one.
620 * Don't allow the mode register to override values. */
621 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
622 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
623
624 /* Calibration cycle.
625 * Don't allow the mode register to override values. */
626 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
627 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
628
629 /* SBA *must* be supported for AGP v3 */
630 *bridge_agpstat |= AGPSTAT_SBA;
631
632 /*
633 * Set speed.
634 * Check for invalid speeds. This can happen when applications
635 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
636 */
637 if (*requested_mode & AGPSTAT_MODE_3_0) {
638 /*
639 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
640 * have been passed a 3.0 mode, but with 2.x speed bits set.
641 * AGP2.x 4x -> AGP3.0 4x.
642 */
643 if (*requested_mode & AGPSTAT2_4X) {
644 printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
645 current->comm, *requested_mode);
646 *requested_mode &= ~AGPSTAT2_4X;
647 *requested_mode |= AGPSTAT3_4X;
648 }
649 } else {
650 /*
651 * The caller doesn't know what they are doing. We are in 3.0 mode,
652 * but have been passed an AGP 2.x mode.
653 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
654 */
655 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
656 current->comm, *requested_mode);
657 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
658 *requested_mode |= AGPSTAT3_4X;
659 }
660
661 if (*requested_mode & AGPSTAT3_8X) {
662 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
663 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
664 *bridge_agpstat |= AGPSTAT3_4X;
665 printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
666 return;
667 }
668 if (!(*vga_agpstat & AGPSTAT3_8X)) {
669 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
670 *bridge_agpstat |= AGPSTAT3_4X;
671 printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
672 return;
673 }
674 /* All set, bridge & device can do AGP x8*/
675 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
676 goto done;
677
678 } else if (*requested_mode & AGPSTAT3_4X) {
679 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
680 *bridge_agpstat |= AGPSTAT3_4X;
681 goto done;
682
683 } else {
684
685 /*
686 * If we didn't specify an AGP mode, we see if both
687 * the graphics card, and the bridge can do x8, and use if so.
688 * If not, we fall back to x4 mode.
689 */
690 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
691 printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
692 "supported by bridge & card (x8).\n");
693 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
694 *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
695 } else {
696 printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
697 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
698 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
699 *bridge_agpstat, origbridge);
700 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
701 *bridge_agpstat |= AGPSTAT3_4X;
702 }
703 if (!(*vga_agpstat & AGPSTAT3_8X)) {
704 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
705 *vga_agpstat, origvga);
706 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
707 *vga_agpstat |= AGPSTAT3_4X;
708 }
709 }
710 }
711
712done:
713 /* Apply any errata. */
714 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
715 *bridge_agpstat &= ~AGPSTAT_FW;
716
717 if (agp_bridge->flags & AGP_ERRATA_SBA)
718 *bridge_agpstat &= ~AGPSTAT_SBA;
719
720 if (agp_bridge->flags & AGP_ERRATA_1X) {
721 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
722 *bridge_agpstat |= AGPSTAT2_1X;
723 }
724}
725
726
727/**
728 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
729 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
730 * @requested_mode: requested agp_stat from userspace (Typically from X)
731 * @bridge_agpstat: current agp_stat from AGP bridge.
732 *
733 * This function will hunt for an AGP graphics card, and try to match
734 * the requested mode to the capabilities of both the bridge and the card.
735 */
736u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
737{
738 struct pci_dev *device = NULL;
739 u32 vga_agpstat;
740 u8 cap_ptr;
741
742 for (;;) {
743 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
744 if (!device) {
745 printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
746 return 0;
747 }
748 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
749 if (cap_ptr)
750 break;
751 }
752
753 /*
754 * Ok, here we have a AGP device. Disable impossible
755 * settings, and adjust the readqueue to the minimum.
756 */
757 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
758
759 /* adjust RQ depth */
760 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
761 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
762 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
763
764 /* disable FW if it's not supported */
765 if (!((bridge_agpstat & AGPSTAT_FW) &&
766 (vga_agpstat & AGPSTAT_FW) &&
767 (requested_mode & AGPSTAT_FW)))
768 bridge_agpstat &= ~AGPSTAT_FW;
769
770 /* Check to see if we are operating in 3.0 mode */
771 if (agp_bridge->mode & AGPSTAT_MODE_3_0)
772 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
773 else
774 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
775
776 pci_dev_put(device);
777 return bridge_agpstat;
778}
779EXPORT_SYMBOL(agp_collect_device_status);
780
781
782void agp_device_command(u32 bridge_agpstat, bool agp_v3)
783{
784 struct pci_dev *device = NULL;
785 int mode;
786
787 mode = bridge_agpstat & 0x7;
788 if (agp_v3)
789 mode *= 4;
790
791 for_each_pci_dev(device) {
792 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
793 if (!agp)
794 continue;
795
796 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
797 agp_v3 ? 3 : 2, mode);
798 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
799 }
800}
801EXPORT_SYMBOL(agp_device_command);
802
803
804void get_agp_version(struct agp_bridge_data *bridge)
805{
806 u32 ncapid;
807
808 /* Exit early if already set by errata workarounds. */
809 if (bridge->major_version != 0)
810 return;
811
812 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
813 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
814 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
815}
816EXPORT_SYMBOL(get_agp_version);
817
818
819void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
820{
821 u32 bridge_agpstat, temp;
822
823 get_agp_version(agp_bridge);
824
825 dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
826 agp_bridge->major_version, agp_bridge->minor_version);
827
828 pci_read_config_dword(agp_bridge->dev,
829 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
830
831 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
832 if (bridge_agpstat == 0)
833 /* Something bad happened. FIXME: Return error code? */
834 return;
835
836 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
837
838 /* Do AGP version specific frobbing. */
839 if (bridge->major_version >= 3) {
840 if (bridge->mode & AGPSTAT_MODE_3_0) {
841 /* If we have 3.5, we can do the isoch stuff. */
842 if (bridge->minor_version >= 5)
843 agp_3_5_enable(bridge);
844 agp_device_command(bridge_agpstat, true);
845 return;
846 } else {
847 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
848 bridge_agpstat &= ~(7<<10) ;
849 pci_read_config_dword(bridge->dev,
850 bridge->capndx+AGPCTRL, &temp);
851 temp |= (1<<9);
852 pci_write_config_dword(bridge->dev,
853 bridge->capndx+AGPCTRL, temp);
854
855 dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
856 }
857 }
858
859 /* AGP v<3 */
860 agp_device_command(bridge_agpstat, false);
861}
862EXPORT_SYMBOL(agp_generic_enable);
863
864
865int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
866{
867 char *table;
868 char *table_end;
869 int size;
870 int page_order;
871 int num_entries;
872 int i;
873 void *temp;
874 struct page *page;
875
876 /* The generic routines can't handle 2 level gatt's */
877 if (bridge->driver->size_type == LVL2_APER_SIZE)
878 return -EINVAL;
879
880 table = NULL;
881 i = bridge->aperture_size_idx;
882 temp = bridge->current_size;
883 size = page_order = num_entries = 0;
884
885 if (bridge->driver->size_type != FIXED_APER_SIZE) {
886 do {
887 switch (bridge->driver->size_type) {
888 case U8_APER_SIZE:
889 size = A_SIZE_8(temp)->size;
890 page_order =
891 A_SIZE_8(temp)->page_order;
892 num_entries =
893 A_SIZE_8(temp)->num_entries;
894 break;
895 case U16_APER_SIZE:
896 size = A_SIZE_16(temp)->size;
897 page_order = A_SIZE_16(temp)->page_order;
898 num_entries = A_SIZE_16(temp)->num_entries;
899 break;
900 case U32_APER_SIZE:
901 size = A_SIZE_32(temp)->size;
902 page_order = A_SIZE_32(temp)->page_order;
903 num_entries = A_SIZE_32(temp)->num_entries;
904 break;
905 /* This case will never really happen. */
906 case FIXED_APER_SIZE:
907 case LVL2_APER_SIZE:
908 default:
909 size = page_order = num_entries = 0;
910 break;
911 }
912
913 table = alloc_gatt_pages(page_order);
914
915 if (table == NULL) {
916 i++;
917 switch (bridge->driver->size_type) {
918 case U8_APER_SIZE:
919 bridge->current_size = A_IDX8(bridge);
920 break;
921 case U16_APER_SIZE:
922 bridge->current_size = A_IDX16(bridge);
923 break;
924 case U32_APER_SIZE:
925 bridge->current_size = A_IDX32(bridge);
926 break;
927 /* These cases will never really happen. */
928 case FIXED_APER_SIZE:
929 case LVL2_APER_SIZE:
930 default:
931 break;
932 }
933 temp = bridge->current_size;
934 } else {
935 bridge->aperture_size_idx = i;
936 }
937 } while (!table && (i < bridge->driver->num_aperture_sizes));
938 } else {
939 size = ((struct aper_size_info_fixed *) temp)->size;
940 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
941 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
942 table = alloc_gatt_pages(page_order);
943 }
944
945 if (table == NULL)
946 return -ENOMEM;
947
948 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
949
950 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
951 SetPageReserved(page);
952
953 bridge->gatt_table_real = (u32 *) table;
954 agp_gatt_table = (void *)table;
955
956 bridge->driver->cache_flush();
957#ifdef CONFIG_X86
958 if (set_memory_uc((unsigned long)table, 1 << page_order))
959 printk(KERN_WARNING "Could not set GATT table memory to UC!");
960
961 bridge->gatt_table = (void *)table;
962#else
963 bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
964 (PAGE_SIZE * (1 << page_order)));
965 bridge->driver->cache_flush();
966#endif
967
968 if (bridge->gatt_table == NULL) {
969 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
970 ClearPageReserved(page);
971
972 free_gatt_pages(table, page_order);
973
974 return -ENOMEM;
975 }
976 bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
977
978 /* AK: bogus, should encode addresses > 4GB */
979 for (i = 0; i < num_entries; i++) {
980 writel(bridge->scratch_page, bridge->gatt_table+i);
981 readl(bridge->gatt_table+i); /* PCI Posting. */
982 }
983
984 return 0;
985}
986EXPORT_SYMBOL(agp_generic_create_gatt_table);
987
988int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
989{
990 int page_order;
991 char *table, *table_end;
992 void *temp;
993 struct page *page;
994
995 temp = bridge->current_size;
996
997 switch (bridge->driver->size_type) {
998 case U8_APER_SIZE:
999 page_order = A_SIZE_8(temp)->page_order;
1000 break;
1001 case U16_APER_SIZE:
1002 page_order = A_SIZE_16(temp)->page_order;
1003 break;
1004 case U32_APER_SIZE:
1005 page_order = A_SIZE_32(temp)->page_order;
1006 break;
1007 case FIXED_APER_SIZE:
1008 page_order = A_SIZE_FIX(temp)->page_order;
1009 break;
1010 case LVL2_APER_SIZE:
1011 /* The generic routines can't deal with 2 level gatt's */
1012 return -EINVAL;
1013 break;
1014 default:
1015 page_order = 0;
1016 break;
1017 }
1018
1019 /* Do not worry about freeing memory, because if this is
1020 * called, then all agp memory is deallocated and removed
1021 * from the table. */
1022
1023#ifdef CONFIG_X86
1024 set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1025#else
1026 iounmap(bridge->gatt_table);
1027#endif
1028 table = (char *) bridge->gatt_table_real;
1029 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1030
1031 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1032 ClearPageReserved(page);
1033
1034 free_gatt_pages(bridge->gatt_table_real, page_order);
1035
1036 agp_gatt_table = NULL;
1037 bridge->gatt_table = NULL;
1038 bridge->gatt_table_real = NULL;
1039 bridge->gatt_bus_addr = 0;
1040
1041 return 0;
1042}
1043EXPORT_SYMBOL(agp_generic_free_gatt_table);
1044
1045
1046int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1047{
1048 int num_entries;
1049 size_t i;
1050 off_t j;
1051 void *temp;
1052 struct agp_bridge_data *bridge;
1053 int mask_type;
1054
1055 bridge = mem->bridge;
1056 if (!bridge)
1057 return -EINVAL;
1058
1059 if (mem->page_count == 0)
1060 return 0;
1061
1062 temp = bridge->current_size;
1063
1064 switch (bridge->driver->size_type) {
1065 case U8_APER_SIZE:
1066 num_entries = A_SIZE_8(temp)->num_entries;
1067 break;
1068 case U16_APER_SIZE:
1069 num_entries = A_SIZE_16(temp)->num_entries;
1070 break;
1071 case U32_APER_SIZE:
1072 num_entries = A_SIZE_32(temp)->num_entries;
1073 break;
1074 case FIXED_APER_SIZE:
1075 num_entries = A_SIZE_FIX(temp)->num_entries;
1076 break;
1077 case LVL2_APER_SIZE:
1078 /* The generic routines can't deal with 2 level gatt's */
1079 return -EINVAL;
1080 break;
1081 default:
1082 num_entries = 0;
1083 break;
1084 }
1085
1086 num_entries -= agp_memory_reserved/PAGE_SIZE;
1087 if (num_entries < 0) num_entries = 0;
1088
1089 if (type != mem->type)
1090 return -EINVAL;
1091
1092 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1093 if (mask_type != 0) {
1094 /* The generic routines know nothing of memory types */
1095 return -EINVAL;
1096 }
1097
1098 if (((pg_start + mem->page_count) > num_entries) ||
1099 ((pg_start + mem->page_count) < pg_start))
1100 return -EINVAL;
1101
1102 j = pg_start;
1103
1104 while (j < (pg_start + mem->page_count)) {
1105 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1106 return -EBUSY;
1107 j++;
1108 }
1109
1110 if (!mem->is_flushed) {
1111 bridge->driver->cache_flush();
1112 mem->is_flushed = true;
1113 }
1114
1115 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1116 writel(bridge->driver->mask_memory(bridge,
1117 page_to_phys(mem->pages[i]),
1118 mask_type),
1119 bridge->gatt_table+j);
1120 }
1121 readl(bridge->gatt_table+j-1); /* PCI Posting. */
1122
1123 bridge->driver->tlb_flush(mem);
1124 return 0;
1125}
1126EXPORT_SYMBOL(agp_generic_insert_memory);
1127
1128
1129int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1130{
1131 size_t i;
1132 struct agp_bridge_data *bridge;
1133 int mask_type, num_entries;
1134
1135 bridge = mem->bridge;
1136 if (!bridge)
1137 return -EINVAL;
1138
1139 if (mem->page_count == 0)
1140 return 0;
1141
1142 if (type != mem->type)
1143 return -EINVAL;
1144
1145 num_entries = agp_num_entries();
1146 if (((pg_start + mem->page_count) > num_entries) ||
1147 ((pg_start + mem->page_count) < pg_start))
1148 return -EINVAL;
1149
1150 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1151 if (mask_type != 0) {
1152 /* The generic routines know nothing of memory types */
1153 return -EINVAL;
1154 }
1155
1156 /* AK: bogus, should encode addresses > 4GB */
1157 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1158 writel(bridge->scratch_page, bridge->gatt_table+i);
1159 }
1160 readl(bridge->gatt_table+i-1); /* PCI Posting. */
1161
1162 bridge->driver->tlb_flush(mem);
1163 return 0;
1164}
1165EXPORT_SYMBOL(agp_generic_remove_memory);
1166
1167struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1168{
1169 return NULL;
1170}
1171EXPORT_SYMBOL(agp_generic_alloc_by_type);
1172
1173void agp_generic_free_by_type(struct agp_memory *curr)
1174{
1175 agp_free_page_array(curr);
1176 agp_free_key(curr->key);
1177 kfree(curr);
1178}
1179EXPORT_SYMBOL(agp_generic_free_by_type);
1180
1181struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1182{
1183 struct agp_memory *new;
1184 int i;
1185 int pages;
1186
1187 pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1188 new = agp_create_user_memory(page_count);
1189 if (new == NULL)
1190 return NULL;
1191
1192 for (i = 0; i < page_count; i++)
1193 new->pages[i] = NULL;
1194 new->page_count = 0;
1195 new->type = type;
1196 new->num_scratch_pages = pages;
1197
1198 return new;
1199}
1200EXPORT_SYMBOL(agp_generic_alloc_user);
1201
1202/*
1203 * Basic Page Allocation Routines -
1204 * These routines handle page allocation and by default they reserve the allocated
1205 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1206 * against a maximum value.
1207 */
1208
1209int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1210{
1211 struct page * page;
1212 int i, ret = -ENOMEM;
1213
1214 for (i = 0; i < num_pages; i++) {
1215 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1216 /* agp_free_memory() needs gart address */
1217 if (page == NULL)
1218 goto out;
1219
1220#ifndef CONFIG_X86
1221 map_page_into_agp(page);
1222#endif
1223 get_page(page);
1224 atomic_inc(&agp_bridge->current_memory_agp);
1225
1226 mem->pages[i] = page;
1227 mem->page_count++;
1228 }
1229
1230#ifdef CONFIG_X86
1231 set_pages_array_uc(mem->pages, num_pages);
1232#endif
1233 ret = 0;
1234out:
1235 return ret;
1236}
1237EXPORT_SYMBOL(agp_generic_alloc_pages);
1238
1239struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1240{
1241 struct page * page;
1242
1243 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1244 if (page == NULL)
1245 return NULL;
1246
1247 map_page_into_agp(page);
1248
1249 get_page(page);
1250 atomic_inc(&agp_bridge->current_memory_agp);
1251 return page;
1252}
1253EXPORT_SYMBOL(agp_generic_alloc_page);
1254
1255void agp_generic_destroy_pages(struct agp_memory *mem)
1256{
1257 int i;
1258 struct page *page;
1259
1260 if (!mem)
1261 return;
1262
1263#ifdef CONFIG_X86
1264 set_pages_array_wb(mem->pages, mem->page_count);
1265#endif
1266
1267 for (i = 0; i < mem->page_count; i++) {
1268 page = mem->pages[i];
1269
1270#ifndef CONFIG_X86
1271 unmap_page_from_agp(page);
1272#endif
1273 put_page(page);
1274 __free_page(page);
1275 atomic_dec(&agp_bridge->current_memory_agp);
1276 mem->pages[i] = NULL;
1277 }
1278}
1279EXPORT_SYMBOL(agp_generic_destroy_pages);
1280
1281void agp_generic_destroy_page(struct page *page, int flags)
1282{
1283 if (page == NULL)
1284 return;
1285
1286 if (flags & AGP_PAGE_DESTROY_UNMAP)
1287 unmap_page_from_agp(page);
1288
1289 if (flags & AGP_PAGE_DESTROY_FREE) {
1290 put_page(page);
1291 __free_page(page);
1292 atomic_dec(&agp_bridge->current_memory_agp);
1293 }
1294}
1295EXPORT_SYMBOL(agp_generic_destroy_page);
1296
1297/* End Basic Page Allocation Routines */
1298
1299
1300/**
1301 * agp_enable - initialise the agp point-to-point connection.
1302 *
1303 * @mode: agp mode register value to configure with.
1304 */
1305void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1306{
1307 if (!bridge)
1308 return;
1309 bridge->driver->agp_enable(bridge, mode);
1310}
1311EXPORT_SYMBOL(agp_enable);
1312
1313/* When we remove the global variable agp_bridge from all drivers
1314 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1315 */
1316
1317struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1318{
1319 if (list_empty(&agp_bridges))
1320 return NULL;
1321
1322 return agp_bridge;
1323}
1324
1325static void ipi_handler(void *null)
1326{
1327 flush_agp_cache();
1328}
1329
1330void global_cache_flush(void)
1331{
1332 if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1333 panic(PFX "timed out waiting for the other CPUs!\n");
1334}
1335EXPORT_SYMBOL(global_cache_flush);
1336
1337unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1338 dma_addr_t addr, int type)
1339{
1340 /* memory type is ignored in the generic routine */
1341 if (bridge->driver->masks)
1342 return addr | bridge->driver->masks[0].mask;
1343 else
1344 return addr;
1345}
1346EXPORT_SYMBOL(agp_generic_mask_memory);
1347
1348int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1349 int type)
1350{
1351 if (type >= AGP_USER_TYPES)
1352 return 0;
1353 return type;
1354}
1355EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1356
1357/*
1358 * These functions are implemented according to the AGPv3 spec,
1359 * which covers implementation details that had previously been
1360 * left open.
1361 */
1362
1363int agp3_generic_fetch_size(void)
1364{
1365 u16 temp_size;
1366 int i;
1367 struct aper_size_info_16 *values;
1368
1369 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1370 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1371
1372 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1373 if (temp_size == values[i].size_value) {
1374 agp_bridge->previous_size =
1375 agp_bridge->current_size = (void *) (values + i);
1376
1377 agp_bridge->aperture_size_idx = i;
1378 return values[i].size;
1379 }
1380 }
1381 return 0;
1382}
1383EXPORT_SYMBOL(agp3_generic_fetch_size);
1384
1385void agp3_generic_tlbflush(struct agp_memory *mem)
1386{
1387 u32 ctrl;
1388 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1389 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1390 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1391}
1392EXPORT_SYMBOL(agp3_generic_tlbflush);
1393
1394int agp3_generic_configure(void)
1395{
1396 u32 temp;
1397 struct aper_size_info_16 *current_size;
1398
1399 current_size = A_SIZE_16(agp_bridge->current_size);
1400
1401 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1402 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1403
1404 /* set aperture size */
1405 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1406 /* set gart pointer */
1407 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1408 /* enable aperture and GTLB */
1409 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1410 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1411 return 0;
1412}
1413EXPORT_SYMBOL(agp3_generic_configure);
1414
1415void agp3_generic_cleanup(void)
1416{
1417 u32 ctrl;
1418 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1419 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1420}
1421EXPORT_SYMBOL(agp3_generic_cleanup);
1422
1423const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1424{
1425 {4096, 1048576, 10,0x000},
1426 {2048, 524288, 9, 0x800},
1427 {1024, 262144, 8, 0xc00},
1428 { 512, 131072, 7, 0xe00},
1429 { 256, 65536, 6, 0xf00},
1430 { 128, 32768, 5, 0xf20},
1431 { 64, 16384, 4, 0xf30},
1432 { 32, 8192, 3, 0xf38},
1433 { 16, 4096, 2, 0xf3c},
1434 { 8, 2048, 1, 0xf3e},
1435 { 4, 1024, 0, 0xf3f}
1436};
1437EXPORT_SYMBOL(agp3_generic_sizes);
1438
1/*
2 * AGPGART driver.
3 * Copyright (C) 2004 Silicon Graphics, Inc.
4 * Copyright (C) 2002-2005 Dave Jones.
5 * Copyright (C) 1999 Jeff Hartmann.
6 * Copyright (C) 1999 Precision Insight, Inc.
7 * Copyright (C) 1999 Xi Graphics, Inc.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
25 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * TODO:
28 * - Allocate more than order 0 pages to avoid too much linear map splitting.
29 */
30#include <linux/module.h>
31#include <linux/pci.h>
32#include <linux/pagemap.h>
33#include <linux/miscdevice.h>
34#include <linux/pm.h>
35#include <linux/agp_backend.h>
36#include <linux/vmalloc.h>
37#include <linux/dma-mapping.h>
38#include <linux/mm.h>
39#include <linux/sched.h>
40#include <linux/slab.h>
41#include <asm/io.h>
42#ifdef CONFIG_X86
43#include <asm/set_memory.h>
44#endif
45#include <asm/pgtable.h>
46#include "agp.h"
47
48__u32 *agp_gatt_table;
49int agp_memory_reserved;
50
51/*
52 * Needed by the Nforce GART driver for the time being. Would be
53 * nice to do this some other way instead of needing this export.
54 */
55EXPORT_SYMBOL_GPL(agp_memory_reserved);
56
57/*
58 * Generic routines for handling agp_memory structures -
59 * They use the basic page allocation routines to do the brunt of the work.
60 */
61
62void agp_free_key(int key)
63{
64 if (key < 0)
65 return;
66
67 if (key < MAXKEY)
68 clear_bit(key, agp_bridge->key_list);
69}
70EXPORT_SYMBOL(agp_free_key);
71
72
73static int agp_get_key(void)
74{
75 int bit;
76
77 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
78 if (bit < MAXKEY) {
79 set_bit(bit, agp_bridge->key_list);
80 return bit;
81 }
82 return -1;
83}
84
85/*
86 * Use kmalloc if possible for the page list. Otherwise fall back to
87 * vmalloc. This speeds things up and also saves memory for small AGP
88 * regions.
89 */
90
91void agp_alloc_page_array(size_t size, struct agp_memory *mem)
92{
93 mem->pages = kvmalloc(size, GFP_KERNEL);
94}
95EXPORT_SYMBOL(agp_alloc_page_array);
96
97static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
98{
99 struct agp_memory *new;
100 unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
101
102 if (INT_MAX/sizeof(struct page *) < num_agp_pages)
103 return NULL;
104
105 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
106 if (new == NULL)
107 return NULL;
108
109 new->key = agp_get_key();
110
111 if (new->key < 0) {
112 kfree(new);
113 return NULL;
114 }
115
116 agp_alloc_page_array(alloc_size, new);
117
118 if (new->pages == NULL) {
119 agp_free_key(new->key);
120 kfree(new);
121 return NULL;
122 }
123 new->num_scratch_pages = 0;
124 return new;
125}
126
127struct agp_memory *agp_create_memory(int scratch_pages)
128{
129 struct agp_memory *new;
130
131 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
132 if (new == NULL)
133 return NULL;
134
135 new->key = agp_get_key();
136
137 if (new->key < 0) {
138 kfree(new);
139 return NULL;
140 }
141
142 agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
143
144 if (new->pages == NULL) {
145 agp_free_key(new->key);
146 kfree(new);
147 return NULL;
148 }
149 new->num_scratch_pages = scratch_pages;
150 new->type = AGP_NORMAL_MEMORY;
151 return new;
152}
153EXPORT_SYMBOL(agp_create_memory);
154
155/**
156 * agp_free_memory - free memory associated with an agp_memory pointer.
157 *
158 * @curr: agp_memory pointer to be freed.
159 *
160 * It is the only function that can be called when the backend is not owned
161 * by the caller. (So it can free memory on client death.)
162 */
163void agp_free_memory(struct agp_memory *curr)
164{
165 size_t i;
166
167 if (curr == NULL)
168 return;
169
170 if (curr->is_bound)
171 agp_unbind_memory(curr);
172
173 if (curr->type >= AGP_USER_TYPES) {
174 agp_generic_free_by_type(curr);
175 return;
176 }
177
178 if (curr->type != 0) {
179 curr->bridge->driver->free_by_type(curr);
180 return;
181 }
182 if (curr->page_count != 0) {
183 if (curr->bridge->driver->agp_destroy_pages) {
184 curr->bridge->driver->agp_destroy_pages(curr);
185 } else {
186
187 for (i = 0; i < curr->page_count; i++) {
188 curr->bridge->driver->agp_destroy_page(
189 curr->pages[i],
190 AGP_PAGE_DESTROY_UNMAP);
191 }
192 for (i = 0; i < curr->page_count; i++) {
193 curr->bridge->driver->agp_destroy_page(
194 curr->pages[i],
195 AGP_PAGE_DESTROY_FREE);
196 }
197 }
198 }
199 agp_free_key(curr->key);
200 agp_free_page_array(curr);
201 kfree(curr);
202}
203EXPORT_SYMBOL(agp_free_memory);
204
205#define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
206
207/**
208 * agp_allocate_memory - allocate a group of pages of a certain type.
209 *
210 * @page_count: size_t argument of the number of pages
211 * @type: u32 argument of the type of memory to be allocated.
212 *
213 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
214 * maps to physical ram. Any other type is device dependent.
215 *
216 * It returns NULL whenever memory is unavailable.
217 */
218struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
219 size_t page_count, u32 type)
220{
221 int scratch_pages;
222 struct agp_memory *new;
223 size_t i;
224 int cur_memory;
225
226 if (!bridge)
227 return NULL;
228
229 cur_memory = atomic_read(&bridge->current_memory_agp);
230 if ((cur_memory + page_count > bridge->max_memory_agp) ||
231 (cur_memory + page_count < page_count))
232 return NULL;
233
234 if (type >= AGP_USER_TYPES) {
235 new = agp_generic_alloc_user(page_count, type);
236 if (new)
237 new->bridge = bridge;
238 return new;
239 }
240
241 if (type != 0) {
242 new = bridge->driver->alloc_by_type(page_count, type);
243 if (new)
244 new->bridge = bridge;
245 return new;
246 }
247
248 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
249
250 new = agp_create_memory(scratch_pages);
251
252 if (new == NULL)
253 return NULL;
254
255 if (bridge->driver->agp_alloc_pages) {
256 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
257 agp_free_memory(new);
258 return NULL;
259 }
260 new->bridge = bridge;
261 return new;
262 }
263
264 for (i = 0; i < page_count; i++) {
265 struct page *page = bridge->driver->agp_alloc_page(bridge);
266
267 if (page == NULL) {
268 agp_free_memory(new);
269 return NULL;
270 }
271 new->pages[i] = page;
272 new->page_count++;
273 }
274 new->bridge = bridge;
275
276 return new;
277}
278EXPORT_SYMBOL(agp_allocate_memory);
279
280
281/* End - Generic routines for handling agp_memory structures */
282
283
284static int agp_return_size(void)
285{
286 int current_size;
287 void *temp;
288
289 temp = agp_bridge->current_size;
290
291 switch (agp_bridge->driver->size_type) {
292 case U8_APER_SIZE:
293 current_size = A_SIZE_8(temp)->size;
294 break;
295 case U16_APER_SIZE:
296 current_size = A_SIZE_16(temp)->size;
297 break;
298 case U32_APER_SIZE:
299 current_size = A_SIZE_32(temp)->size;
300 break;
301 case LVL2_APER_SIZE:
302 current_size = A_SIZE_LVL2(temp)->size;
303 break;
304 case FIXED_APER_SIZE:
305 current_size = A_SIZE_FIX(temp)->size;
306 break;
307 default:
308 current_size = 0;
309 break;
310 }
311
312 current_size -= (agp_memory_reserved / (1024*1024));
313 if (current_size <0)
314 current_size = 0;
315 return current_size;
316}
317
318
319int agp_num_entries(void)
320{
321 int num_entries;
322 void *temp;
323
324 temp = agp_bridge->current_size;
325
326 switch (agp_bridge->driver->size_type) {
327 case U8_APER_SIZE:
328 num_entries = A_SIZE_8(temp)->num_entries;
329 break;
330 case U16_APER_SIZE:
331 num_entries = A_SIZE_16(temp)->num_entries;
332 break;
333 case U32_APER_SIZE:
334 num_entries = A_SIZE_32(temp)->num_entries;
335 break;
336 case LVL2_APER_SIZE:
337 num_entries = A_SIZE_LVL2(temp)->num_entries;
338 break;
339 case FIXED_APER_SIZE:
340 num_entries = A_SIZE_FIX(temp)->num_entries;
341 break;
342 default:
343 num_entries = 0;
344 break;
345 }
346
347 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
348 if (num_entries<0)
349 num_entries = 0;
350 return num_entries;
351}
352EXPORT_SYMBOL_GPL(agp_num_entries);
353
354
355/**
356 * agp_copy_info - copy bridge state information
357 *
358 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
359 *
360 * This function copies information about the agp bridge device and the state of
361 * the agp backend into an agp_kern_info pointer.
362 */
363int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
364{
365 memset(info, 0, sizeof(struct agp_kern_info));
366 if (!bridge) {
367 info->chipset = NOT_SUPPORTED;
368 return -EIO;
369 }
370
371 info->version.major = bridge->version->major;
372 info->version.minor = bridge->version->minor;
373 info->chipset = SUPPORTED;
374 info->device = bridge->dev;
375 if (bridge->mode & AGPSTAT_MODE_3_0)
376 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
377 else
378 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
379 info->aper_base = bridge->gart_bus_addr;
380 info->aper_size = agp_return_size();
381 info->max_memory = bridge->max_memory_agp;
382 info->current_memory = atomic_read(&bridge->current_memory_agp);
383 info->cant_use_aperture = bridge->driver->cant_use_aperture;
384 info->vm_ops = bridge->vm_ops;
385 info->page_mask = ~0UL;
386 return 0;
387}
388EXPORT_SYMBOL(agp_copy_info);
389
390/* End - Routine to copy over information structure */
391
392/*
393 * Routines for handling swapping of agp_memory into the GATT -
394 * These routines take agp_memory and insert them into the GATT.
395 * They call device specific routines to actually write to the GATT.
396 */
397
398/**
399 * agp_bind_memory - Bind an agp_memory structure into the GATT.
400 *
401 * @curr: agp_memory pointer
402 * @pg_start: an offset into the graphics aperture translation table
403 *
404 * It returns -EINVAL if the pointer == NULL.
405 * It returns -EBUSY if the area of the table requested is already in use.
406 */
407int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
408{
409 int ret_val;
410
411 if (curr == NULL)
412 return -EINVAL;
413
414 if (curr->is_bound) {
415 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
416 return -EINVAL;
417 }
418 if (!curr->is_flushed) {
419 curr->bridge->driver->cache_flush();
420 curr->is_flushed = true;
421 }
422
423 ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
424
425 if (ret_val != 0)
426 return ret_val;
427
428 curr->is_bound = true;
429 curr->pg_start = pg_start;
430 spin_lock(&agp_bridge->mapped_lock);
431 list_add(&curr->mapped_list, &agp_bridge->mapped_list);
432 spin_unlock(&agp_bridge->mapped_lock);
433
434 return 0;
435}
436EXPORT_SYMBOL(agp_bind_memory);
437
438
439/**
440 * agp_unbind_memory - Removes an agp_memory structure from the GATT
441 *
442 * @curr: agp_memory pointer to be removed from the GATT.
443 *
444 * It returns -EINVAL if this piece of agp_memory is not currently bound to
445 * the graphics aperture translation table or if the agp_memory pointer == NULL
446 */
447int agp_unbind_memory(struct agp_memory *curr)
448{
449 int ret_val;
450
451 if (curr == NULL)
452 return -EINVAL;
453
454 if (!curr->is_bound) {
455 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
456 return -EINVAL;
457 }
458
459 ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
460
461 if (ret_val != 0)
462 return ret_val;
463
464 curr->is_bound = false;
465 curr->pg_start = 0;
466 spin_lock(&curr->bridge->mapped_lock);
467 list_del(&curr->mapped_list);
468 spin_unlock(&curr->bridge->mapped_lock);
469 return 0;
470}
471EXPORT_SYMBOL(agp_unbind_memory);
472
473
474/* End - Routines for handling swapping of agp_memory into the GATT */
475
476
477/* Generic Agp routines - Start */
478static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
479{
480 u32 tmp;
481
482 if (*requested_mode & AGP2_RESERVED_MASK) {
483 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
484 *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
485 *requested_mode &= ~AGP2_RESERVED_MASK;
486 }
487
488 /*
489 * Some dumb bridges are programmed to disobey the AGP2 spec.
490 * This is likely a BIOS misprogramming rather than poweron default, or
491 * it would be a lot more common.
492 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
493 * AGPv2 spec 6.1.9 states:
494 * The RATE field indicates the data transfer rates supported by this
495 * device. A.G.P. devices must report all that apply.
496 * Fix them up as best we can.
497 */
498 switch (*bridge_agpstat & 7) {
499 case 4:
500 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
501 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate. "
502 "Fixing up support for x2 & x1\n");
503 break;
504 case 2:
505 *bridge_agpstat |= AGPSTAT2_1X;
506 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate. "
507 "Fixing up support for x1\n");
508 break;
509 default:
510 break;
511 }
512
513 /* Check the speed bits make sense. Only one should be set. */
514 tmp = *requested_mode & 7;
515 switch (tmp) {
516 case 0:
517 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
518 *requested_mode |= AGPSTAT2_1X;
519 break;
520 case 1:
521 case 2:
522 break;
523 case 3:
524 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
525 break;
526 case 4:
527 break;
528 case 5:
529 case 6:
530 case 7:
531 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
532 break;
533 }
534
535 /* disable SBA if it's not supported */
536 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
537 *bridge_agpstat &= ~AGPSTAT_SBA;
538
539 /* Set rate */
540 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
541 *bridge_agpstat &= ~AGPSTAT2_4X;
542
543 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
544 *bridge_agpstat &= ~AGPSTAT2_2X;
545
546 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
547 *bridge_agpstat &= ~AGPSTAT2_1X;
548
549 /* Now we know what mode it should be, clear out the unwanted bits. */
550 if (*bridge_agpstat & AGPSTAT2_4X)
551 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
552
553 if (*bridge_agpstat & AGPSTAT2_2X)
554 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
555
556 if (*bridge_agpstat & AGPSTAT2_1X)
557 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
558
559 /* Apply any errata. */
560 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
561 *bridge_agpstat &= ~AGPSTAT_FW;
562
563 if (agp_bridge->flags & AGP_ERRATA_SBA)
564 *bridge_agpstat &= ~AGPSTAT_SBA;
565
566 if (agp_bridge->flags & AGP_ERRATA_1X) {
567 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
568 *bridge_agpstat |= AGPSTAT2_1X;
569 }
570
571 /* If we've dropped down to 1X, disable fast writes. */
572 if (*bridge_agpstat & AGPSTAT2_1X)
573 *bridge_agpstat &= ~AGPSTAT_FW;
574}
575
576/*
577 * requested_mode = Mode requested by (typically) X.
578 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
579 * vga_agpstat = PCI_AGP_STATUS from graphic card.
580 */
581static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
582{
583 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
584 u32 tmp;
585
586 if (*requested_mode & AGP3_RESERVED_MASK) {
587 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
588 *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
589 *requested_mode &= ~AGP3_RESERVED_MASK;
590 }
591
592 /* Check the speed bits make sense. */
593 tmp = *requested_mode & 7;
594 if (tmp == 0) {
595 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
596 *requested_mode |= AGPSTAT3_4X;
597 }
598 if (tmp >= 3) {
599 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
600 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
601 }
602
603 /* ARQSZ - Set the value to the maximum one.
604 * Don't allow the mode register to override values. */
605 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
606 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
607
608 /* Calibration cycle.
609 * Don't allow the mode register to override values. */
610 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
611 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
612
613 /* SBA *must* be supported for AGP v3 */
614 *bridge_agpstat |= AGPSTAT_SBA;
615
616 /*
617 * Set speed.
618 * Check for invalid speeds. This can happen when applications
619 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
620 */
621 if (*requested_mode & AGPSTAT_MODE_3_0) {
622 /*
623 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
624 * have been passed a 3.0 mode, but with 2.x speed bits set.
625 * AGP2.x 4x -> AGP3.0 4x.
626 */
627 if (*requested_mode & AGPSTAT2_4X) {
628 printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
629 current->comm, *requested_mode);
630 *requested_mode &= ~AGPSTAT2_4X;
631 *requested_mode |= AGPSTAT3_4X;
632 }
633 } else {
634 /*
635 * The caller doesn't know what they are doing. We are in 3.0 mode,
636 * but have been passed an AGP 2.x mode.
637 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
638 */
639 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
640 current->comm, *requested_mode);
641 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
642 *requested_mode |= AGPSTAT3_4X;
643 }
644
645 if (*requested_mode & AGPSTAT3_8X) {
646 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
647 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
648 *bridge_agpstat |= AGPSTAT3_4X;
649 printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
650 return;
651 }
652 if (!(*vga_agpstat & AGPSTAT3_8X)) {
653 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
654 *bridge_agpstat |= AGPSTAT3_4X;
655 printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
656 return;
657 }
658 /* All set, bridge & device can do AGP x8*/
659 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
660 goto done;
661
662 } else if (*requested_mode & AGPSTAT3_4X) {
663 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
664 *bridge_agpstat |= AGPSTAT3_4X;
665 goto done;
666
667 } else {
668
669 /*
670 * If we didn't specify an AGP mode, we see if both
671 * the graphics card, and the bridge can do x8, and use if so.
672 * If not, we fall back to x4 mode.
673 */
674 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
675 printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
676 "supported by bridge & card (x8).\n");
677 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
678 *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
679 } else {
680 printk(KERN_INFO PFX "Fell back to AGPx4 mode because ");
681 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
682 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
683 *bridge_agpstat, origbridge);
684 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
685 *bridge_agpstat |= AGPSTAT3_4X;
686 }
687 if (!(*vga_agpstat & AGPSTAT3_8X)) {
688 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
689 *vga_agpstat, origvga);
690 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
691 *vga_agpstat |= AGPSTAT3_4X;
692 }
693 }
694 }
695
696done:
697 /* Apply any errata. */
698 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
699 *bridge_agpstat &= ~AGPSTAT_FW;
700
701 if (agp_bridge->flags & AGP_ERRATA_SBA)
702 *bridge_agpstat &= ~AGPSTAT_SBA;
703
704 if (agp_bridge->flags & AGP_ERRATA_1X) {
705 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
706 *bridge_agpstat |= AGPSTAT2_1X;
707 }
708}
709
710
711/**
712 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
713 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
714 * @requested_mode: requested agp_stat from userspace (Typically from X)
715 * @bridge_agpstat: current agp_stat from AGP bridge.
716 *
717 * This function will hunt for an AGP graphics card, and try to match
718 * the requested mode to the capabilities of both the bridge and the card.
719 */
720u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
721{
722 struct pci_dev *device = NULL;
723 u32 vga_agpstat;
724 u8 cap_ptr;
725
726 for (;;) {
727 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
728 if (!device) {
729 printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
730 return 0;
731 }
732 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
733 if (cap_ptr)
734 break;
735 }
736
737 /*
738 * Ok, here we have a AGP device. Disable impossible
739 * settings, and adjust the readqueue to the minimum.
740 */
741 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
742
743 /* adjust RQ depth */
744 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
745 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
746 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
747
748 /* disable FW if it's not supported */
749 if (!((bridge_agpstat & AGPSTAT_FW) &&
750 (vga_agpstat & AGPSTAT_FW) &&
751 (requested_mode & AGPSTAT_FW)))
752 bridge_agpstat &= ~AGPSTAT_FW;
753
754 /* Check to see if we are operating in 3.0 mode */
755 if (agp_bridge->mode & AGPSTAT_MODE_3_0)
756 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
757 else
758 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
759
760 pci_dev_put(device);
761 return bridge_agpstat;
762}
763EXPORT_SYMBOL(agp_collect_device_status);
764
765
766void agp_device_command(u32 bridge_agpstat, bool agp_v3)
767{
768 struct pci_dev *device = NULL;
769 int mode;
770
771 mode = bridge_agpstat & 0x7;
772 if (agp_v3)
773 mode *= 4;
774
775 for_each_pci_dev(device) {
776 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
777 if (!agp)
778 continue;
779
780 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
781 agp_v3 ? 3 : 2, mode);
782 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
783 }
784}
785EXPORT_SYMBOL(agp_device_command);
786
787
788void get_agp_version(struct agp_bridge_data *bridge)
789{
790 u32 ncapid;
791
792 /* Exit early if already set by errata workarounds. */
793 if (bridge->major_version != 0)
794 return;
795
796 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
797 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
798 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
799}
800EXPORT_SYMBOL(get_agp_version);
801
802
803void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
804{
805 u32 bridge_agpstat, temp;
806
807 get_agp_version(agp_bridge);
808
809 dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
810 agp_bridge->major_version, agp_bridge->minor_version);
811
812 pci_read_config_dword(agp_bridge->dev,
813 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
814
815 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
816 if (bridge_agpstat == 0)
817 /* Something bad happened. FIXME: Return error code? */
818 return;
819
820 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
821
822 /* Do AGP version specific frobbing. */
823 if (bridge->major_version >= 3) {
824 if (bridge->mode & AGPSTAT_MODE_3_0) {
825 /* If we have 3.5, we can do the isoch stuff. */
826 if (bridge->minor_version >= 5)
827 agp_3_5_enable(bridge);
828 agp_device_command(bridge_agpstat, true);
829 return;
830 } else {
831 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
832 bridge_agpstat &= ~(7<<10) ;
833 pci_read_config_dword(bridge->dev,
834 bridge->capndx+AGPCTRL, &temp);
835 temp |= (1<<9);
836 pci_write_config_dword(bridge->dev,
837 bridge->capndx+AGPCTRL, temp);
838
839 dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
840 }
841 }
842
843 /* AGP v<3 */
844 agp_device_command(bridge_agpstat, false);
845}
846EXPORT_SYMBOL(agp_generic_enable);
847
848
849int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
850{
851 char *table;
852 char *table_end;
853 int size;
854 int page_order;
855 int num_entries;
856 int i;
857 void *temp;
858 struct page *page;
859
860 /* The generic routines can't handle 2 level gatt's */
861 if (bridge->driver->size_type == LVL2_APER_SIZE)
862 return -EINVAL;
863
864 table = NULL;
865 i = bridge->aperture_size_idx;
866 temp = bridge->current_size;
867 size = page_order = num_entries = 0;
868
869 if (bridge->driver->size_type != FIXED_APER_SIZE) {
870 do {
871 switch (bridge->driver->size_type) {
872 case U8_APER_SIZE:
873 size = A_SIZE_8(temp)->size;
874 page_order =
875 A_SIZE_8(temp)->page_order;
876 num_entries =
877 A_SIZE_8(temp)->num_entries;
878 break;
879 case U16_APER_SIZE:
880 size = A_SIZE_16(temp)->size;
881 page_order = A_SIZE_16(temp)->page_order;
882 num_entries = A_SIZE_16(temp)->num_entries;
883 break;
884 case U32_APER_SIZE:
885 size = A_SIZE_32(temp)->size;
886 page_order = A_SIZE_32(temp)->page_order;
887 num_entries = A_SIZE_32(temp)->num_entries;
888 break;
889 /* This case will never really happen. */
890 case FIXED_APER_SIZE:
891 case LVL2_APER_SIZE:
892 default:
893 size = page_order = num_entries = 0;
894 break;
895 }
896
897 table = alloc_gatt_pages(page_order);
898
899 if (table == NULL) {
900 i++;
901 switch (bridge->driver->size_type) {
902 case U8_APER_SIZE:
903 bridge->current_size = A_IDX8(bridge);
904 break;
905 case U16_APER_SIZE:
906 bridge->current_size = A_IDX16(bridge);
907 break;
908 case U32_APER_SIZE:
909 bridge->current_size = A_IDX32(bridge);
910 break;
911 /* These cases will never really happen. */
912 case FIXED_APER_SIZE:
913 case LVL2_APER_SIZE:
914 default:
915 break;
916 }
917 temp = bridge->current_size;
918 } else {
919 bridge->aperture_size_idx = i;
920 }
921 } while (!table && (i < bridge->driver->num_aperture_sizes));
922 } else {
923 size = ((struct aper_size_info_fixed *) temp)->size;
924 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
925 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
926 table = alloc_gatt_pages(page_order);
927 }
928
929 if (table == NULL)
930 return -ENOMEM;
931
932 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
933
934 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
935 SetPageReserved(page);
936
937 bridge->gatt_table_real = (u32 *) table;
938 agp_gatt_table = (void *)table;
939
940 bridge->driver->cache_flush();
941#ifdef CONFIG_X86
942 if (set_memory_uc((unsigned long)table, 1 << page_order))
943 printk(KERN_WARNING "Could not set GATT table memory to UC!\n");
944
945 bridge->gatt_table = (u32 __iomem *)table;
946#else
947 bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
948 (PAGE_SIZE * (1 << page_order)));
949 bridge->driver->cache_flush();
950#endif
951
952 if (bridge->gatt_table == NULL) {
953 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
954 ClearPageReserved(page);
955
956 free_gatt_pages(table, page_order);
957
958 return -ENOMEM;
959 }
960 bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
961
962 /* AK: bogus, should encode addresses > 4GB */
963 for (i = 0; i < num_entries; i++) {
964 writel(bridge->scratch_page, bridge->gatt_table+i);
965 readl(bridge->gatt_table+i); /* PCI Posting. */
966 }
967
968 return 0;
969}
970EXPORT_SYMBOL(agp_generic_create_gatt_table);
971
972int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
973{
974 int page_order;
975 char *table, *table_end;
976 void *temp;
977 struct page *page;
978
979 temp = bridge->current_size;
980
981 switch (bridge->driver->size_type) {
982 case U8_APER_SIZE:
983 page_order = A_SIZE_8(temp)->page_order;
984 break;
985 case U16_APER_SIZE:
986 page_order = A_SIZE_16(temp)->page_order;
987 break;
988 case U32_APER_SIZE:
989 page_order = A_SIZE_32(temp)->page_order;
990 break;
991 case FIXED_APER_SIZE:
992 page_order = A_SIZE_FIX(temp)->page_order;
993 break;
994 case LVL2_APER_SIZE:
995 /* The generic routines can't deal with 2 level gatt's */
996 return -EINVAL;
997 default:
998 page_order = 0;
999 break;
1000 }
1001
1002 /* Do not worry about freeing memory, because if this is
1003 * called, then all agp memory is deallocated and removed
1004 * from the table. */
1005
1006#ifdef CONFIG_X86
1007 set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1008#else
1009 iounmap(bridge->gatt_table);
1010#endif
1011 table = (char *) bridge->gatt_table_real;
1012 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1013
1014 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1015 ClearPageReserved(page);
1016
1017 free_gatt_pages(bridge->gatt_table_real, page_order);
1018
1019 agp_gatt_table = NULL;
1020 bridge->gatt_table = NULL;
1021 bridge->gatt_table_real = NULL;
1022 bridge->gatt_bus_addr = 0;
1023
1024 return 0;
1025}
1026EXPORT_SYMBOL(agp_generic_free_gatt_table);
1027
1028
1029int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1030{
1031 int num_entries;
1032 size_t i;
1033 off_t j;
1034 void *temp;
1035 struct agp_bridge_data *bridge;
1036 int mask_type;
1037
1038 bridge = mem->bridge;
1039 if (!bridge)
1040 return -EINVAL;
1041
1042 if (mem->page_count == 0)
1043 return 0;
1044
1045 temp = bridge->current_size;
1046
1047 switch (bridge->driver->size_type) {
1048 case U8_APER_SIZE:
1049 num_entries = A_SIZE_8(temp)->num_entries;
1050 break;
1051 case U16_APER_SIZE:
1052 num_entries = A_SIZE_16(temp)->num_entries;
1053 break;
1054 case U32_APER_SIZE:
1055 num_entries = A_SIZE_32(temp)->num_entries;
1056 break;
1057 case FIXED_APER_SIZE:
1058 num_entries = A_SIZE_FIX(temp)->num_entries;
1059 break;
1060 case LVL2_APER_SIZE:
1061 /* The generic routines can't deal with 2 level gatt's */
1062 return -EINVAL;
1063 default:
1064 num_entries = 0;
1065 break;
1066 }
1067
1068 num_entries -= agp_memory_reserved/PAGE_SIZE;
1069 if (num_entries < 0) num_entries = 0;
1070
1071 if (type != mem->type)
1072 return -EINVAL;
1073
1074 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1075 if (mask_type != 0) {
1076 /* The generic routines know nothing of memory types */
1077 return -EINVAL;
1078 }
1079
1080 if (((pg_start + mem->page_count) > num_entries) ||
1081 ((pg_start + mem->page_count) < pg_start))
1082 return -EINVAL;
1083
1084 j = pg_start;
1085
1086 while (j < (pg_start + mem->page_count)) {
1087 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1088 return -EBUSY;
1089 j++;
1090 }
1091
1092 if (!mem->is_flushed) {
1093 bridge->driver->cache_flush();
1094 mem->is_flushed = true;
1095 }
1096
1097 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1098 writel(bridge->driver->mask_memory(bridge,
1099 page_to_phys(mem->pages[i]),
1100 mask_type),
1101 bridge->gatt_table+j);
1102 }
1103 readl(bridge->gatt_table+j-1); /* PCI Posting. */
1104
1105 bridge->driver->tlb_flush(mem);
1106 return 0;
1107}
1108EXPORT_SYMBOL(agp_generic_insert_memory);
1109
1110
1111int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1112{
1113 size_t i;
1114 struct agp_bridge_data *bridge;
1115 int mask_type, num_entries;
1116
1117 bridge = mem->bridge;
1118 if (!bridge)
1119 return -EINVAL;
1120
1121 if (mem->page_count == 0)
1122 return 0;
1123
1124 if (type != mem->type)
1125 return -EINVAL;
1126
1127 num_entries = agp_num_entries();
1128 if (((pg_start + mem->page_count) > num_entries) ||
1129 ((pg_start + mem->page_count) < pg_start))
1130 return -EINVAL;
1131
1132 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1133 if (mask_type != 0) {
1134 /* The generic routines know nothing of memory types */
1135 return -EINVAL;
1136 }
1137
1138 /* AK: bogus, should encode addresses > 4GB */
1139 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1140 writel(bridge->scratch_page, bridge->gatt_table+i);
1141 }
1142 readl(bridge->gatt_table+i-1); /* PCI Posting. */
1143
1144 bridge->driver->tlb_flush(mem);
1145 return 0;
1146}
1147EXPORT_SYMBOL(agp_generic_remove_memory);
1148
1149struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1150{
1151 return NULL;
1152}
1153EXPORT_SYMBOL(agp_generic_alloc_by_type);
1154
1155void agp_generic_free_by_type(struct agp_memory *curr)
1156{
1157 agp_free_page_array(curr);
1158 agp_free_key(curr->key);
1159 kfree(curr);
1160}
1161EXPORT_SYMBOL(agp_generic_free_by_type);
1162
1163struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1164{
1165 struct agp_memory *new;
1166 int i;
1167 int pages;
1168
1169 pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1170 new = agp_create_user_memory(page_count);
1171 if (new == NULL)
1172 return NULL;
1173
1174 for (i = 0; i < page_count; i++)
1175 new->pages[i] = NULL;
1176 new->page_count = 0;
1177 new->type = type;
1178 new->num_scratch_pages = pages;
1179
1180 return new;
1181}
1182EXPORT_SYMBOL(agp_generic_alloc_user);
1183
1184/*
1185 * Basic Page Allocation Routines -
1186 * These routines handle page allocation and by default they reserve the allocated
1187 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1188 * against a maximum value.
1189 */
1190
1191int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1192{
1193 struct page * page;
1194 int i, ret = -ENOMEM;
1195
1196 for (i = 0; i < num_pages; i++) {
1197 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1198 /* agp_free_memory() needs gart address */
1199 if (page == NULL)
1200 goto out;
1201
1202#ifndef CONFIG_X86
1203 map_page_into_agp(page);
1204#endif
1205 get_page(page);
1206 atomic_inc(&agp_bridge->current_memory_agp);
1207
1208 mem->pages[i] = page;
1209 mem->page_count++;
1210 }
1211
1212#ifdef CONFIG_X86
1213 set_pages_array_uc(mem->pages, num_pages);
1214#endif
1215 ret = 0;
1216out:
1217 return ret;
1218}
1219EXPORT_SYMBOL(agp_generic_alloc_pages);
1220
1221struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1222{
1223 struct page * page;
1224
1225 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1226 if (page == NULL)
1227 return NULL;
1228
1229 map_page_into_agp(page);
1230
1231 get_page(page);
1232 atomic_inc(&agp_bridge->current_memory_agp);
1233 return page;
1234}
1235EXPORT_SYMBOL(agp_generic_alloc_page);
1236
1237void agp_generic_destroy_pages(struct agp_memory *mem)
1238{
1239 int i;
1240 struct page *page;
1241
1242 if (!mem)
1243 return;
1244
1245#ifdef CONFIG_X86
1246 set_pages_array_wb(mem->pages, mem->page_count);
1247#endif
1248
1249 for (i = 0; i < mem->page_count; i++) {
1250 page = mem->pages[i];
1251
1252#ifndef CONFIG_X86
1253 unmap_page_from_agp(page);
1254#endif
1255 put_page(page);
1256 __free_page(page);
1257 atomic_dec(&agp_bridge->current_memory_agp);
1258 mem->pages[i] = NULL;
1259 }
1260}
1261EXPORT_SYMBOL(agp_generic_destroy_pages);
1262
1263void agp_generic_destroy_page(struct page *page, int flags)
1264{
1265 if (page == NULL)
1266 return;
1267
1268 if (flags & AGP_PAGE_DESTROY_UNMAP)
1269 unmap_page_from_agp(page);
1270
1271 if (flags & AGP_PAGE_DESTROY_FREE) {
1272 put_page(page);
1273 __free_page(page);
1274 atomic_dec(&agp_bridge->current_memory_agp);
1275 }
1276}
1277EXPORT_SYMBOL(agp_generic_destroy_page);
1278
1279/* End Basic Page Allocation Routines */
1280
1281
1282/**
1283 * agp_enable - initialise the agp point-to-point connection.
1284 *
1285 * @mode: agp mode register value to configure with.
1286 */
1287void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1288{
1289 if (!bridge)
1290 return;
1291 bridge->driver->agp_enable(bridge, mode);
1292}
1293EXPORT_SYMBOL(agp_enable);
1294
1295/* When we remove the global variable agp_bridge from all drivers
1296 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1297 */
1298
1299struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1300{
1301 if (list_empty(&agp_bridges))
1302 return NULL;
1303
1304 return agp_bridge;
1305}
1306
1307static void ipi_handler(void *null)
1308{
1309 flush_agp_cache();
1310}
1311
1312void global_cache_flush(void)
1313{
1314 on_each_cpu(ipi_handler, NULL, 1);
1315}
1316EXPORT_SYMBOL(global_cache_flush);
1317
1318unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1319 dma_addr_t addr, int type)
1320{
1321 /* memory type is ignored in the generic routine */
1322 if (bridge->driver->masks)
1323 return addr | bridge->driver->masks[0].mask;
1324 else
1325 return addr;
1326}
1327EXPORT_SYMBOL(agp_generic_mask_memory);
1328
1329int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1330 int type)
1331{
1332 if (type >= AGP_USER_TYPES)
1333 return 0;
1334 return type;
1335}
1336EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1337
1338/*
1339 * These functions are implemented according to the AGPv3 spec,
1340 * which covers implementation details that had previously been
1341 * left open.
1342 */
1343
1344int agp3_generic_fetch_size(void)
1345{
1346 u16 temp_size;
1347 int i;
1348 struct aper_size_info_16 *values;
1349
1350 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1351 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1352
1353 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1354 if (temp_size == values[i].size_value) {
1355 agp_bridge->previous_size =
1356 agp_bridge->current_size = (void *) (values + i);
1357
1358 agp_bridge->aperture_size_idx = i;
1359 return values[i].size;
1360 }
1361 }
1362 return 0;
1363}
1364EXPORT_SYMBOL(agp3_generic_fetch_size);
1365
1366void agp3_generic_tlbflush(struct agp_memory *mem)
1367{
1368 u32 ctrl;
1369 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1370 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1371 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1372}
1373EXPORT_SYMBOL(agp3_generic_tlbflush);
1374
1375int agp3_generic_configure(void)
1376{
1377 u32 temp;
1378 struct aper_size_info_16 *current_size;
1379
1380 current_size = A_SIZE_16(agp_bridge->current_size);
1381
1382 agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
1383 AGP_APERTURE_BAR);
1384
1385 /* set aperture size */
1386 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1387 /* set gart pointer */
1388 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1389 /* enable aperture and GTLB */
1390 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1391 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1392 return 0;
1393}
1394EXPORT_SYMBOL(agp3_generic_configure);
1395
1396void agp3_generic_cleanup(void)
1397{
1398 u32 ctrl;
1399 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1400 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1401}
1402EXPORT_SYMBOL(agp3_generic_cleanup);
1403
1404const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1405{
1406 {4096, 1048576, 10,0x000},
1407 {2048, 524288, 9, 0x800},
1408 {1024, 262144, 8, 0xc00},
1409 { 512, 131072, 7, 0xe00},
1410 { 256, 65536, 6, 0xf00},
1411 { 128, 32768, 5, 0xf20},
1412 { 64, 16384, 4, 0xf30},
1413 { 32, 8192, 3, 0xf38},
1414 { 16, 4096, 2, 0xf3c},
1415 { 8, 2048, 1, 0xf3e},
1416 { 4, 1024, 0, 0xf3f}
1417};
1418EXPORT_SYMBOL(agp3_generic_sizes);
1419