xref: /openbmc/linux/drivers/char/agp/generic.c (revision 2a598d0b)
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 "agp.h"
46 
47 __u32 *agp_gatt_table;
48 int 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  */
54 EXPORT_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 
61 void 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 }
69 EXPORT_SYMBOL(agp_free_key);
70 
71 
72 static 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 
90 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
91 {
92 	mem->pages = kvmalloc(size, GFP_KERNEL);
93 }
94 EXPORT_SYMBOL(agp_alloc_page_array);
95 
96 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
97 {
98 	struct agp_memory *new;
99 	unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
100 
101 	if (INT_MAX/sizeof(struct page *) < num_agp_pages)
102 		return NULL;
103 
104 	new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
105 	if (new == NULL)
106 		return NULL;
107 
108 	new->key = agp_get_key();
109 
110 	if (new->key < 0) {
111 		kfree(new);
112 		return NULL;
113 	}
114 
115 	agp_alloc_page_array(alloc_size, new);
116 
117 	if (new->pages == NULL) {
118 		agp_free_key(new->key);
119 		kfree(new);
120 		return NULL;
121 	}
122 	new->num_scratch_pages = 0;
123 	return new;
124 }
125 
126 struct agp_memory *agp_create_memory(int scratch_pages)
127 {
128 	struct agp_memory *new;
129 
130 	new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
131 	if (new == NULL)
132 		return NULL;
133 
134 	new->key = agp_get_key();
135 
136 	if (new->key < 0) {
137 		kfree(new);
138 		return NULL;
139 	}
140 
141 	agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
142 
143 	if (new->pages == NULL) {
144 		agp_free_key(new->key);
145 		kfree(new);
146 		return NULL;
147 	}
148 	new->num_scratch_pages = scratch_pages;
149 	new->type = AGP_NORMAL_MEMORY;
150 	return new;
151 }
152 EXPORT_SYMBOL(agp_create_memory);
153 
154 /**
155  *	agp_free_memory - free memory associated with an agp_memory pointer.
156  *
157  *	@curr:		agp_memory pointer to be freed.
158  *
159  *	It is the only function that can be called when the backend is not owned
160  *	by the caller.  (So it can free memory on client death.)
161  */
162 void agp_free_memory(struct agp_memory *curr)
163 {
164 	size_t i;
165 
166 	if (curr == NULL)
167 		return;
168 
169 	if (curr->is_bound)
170 		agp_unbind_memory(curr);
171 
172 	if (curr->type >= AGP_USER_TYPES) {
173 		agp_generic_free_by_type(curr);
174 		return;
175 	}
176 
177 	if (curr->type != 0) {
178 		curr->bridge->driver->free_by_type(curr);
179 		return;
180 	}
181 	if (curr->page_count != 0) {
182 		if (curr->bridge->driver->agp_destroy_pages) {
183 			curr->bridge->driver->agp_destroy_pages(curr);
184 		} else {
185 
186 			for (i = 0; i < curr->page_count; i++) {
187 				curr->bridge->driver->agp_destroy_page(
188 					curr->pages[i],
189 					AGP_PAGE_DESTROY_UNMAP);
190 			}
191 			for (i = 0; i < curr->page_count; i++) {
192 				curr->bridge->driver->agp_destroy_page(
193 					curr->pages[i],
194 					AGP_PAGE_DESTROY_FREE);
195 			}
196 		}
197 	}
198 	agp_free_key(curr->key);
199 	agp_free_page_array(curr);
200 	kfree(curr);
201 }
202 EXPORT_SYMBOL(agp_free_memory);
203 
204 #define ENTRIES_PER_PAGE		(PAGE_SIZE / sizeof(unsigned long))
205 
206 /**
207  *	agp_allocate_memory  -  allocate a group of pages of a certain type.
208  *
209  *	@bridge: an agp_bridge_data struct allocated for the AGP host bridge.
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  */
218 struct 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 }
278 EXPORT_SYMBOL(agp_allocate_memory);
279 
280 
281 /* End - Generic routines for handling agp_memory structures */
282 
283 
284 static 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 
319 int 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 }
352 EXPORT_SYMBOL_GPL(agp_num_entries);
353 
354 
355 /**
356  *	agp_copy_info  -  copy bridge state information
357  *
358  *	@bridge: an agp_bridge_data struct allocated for the AGP host bridge.
359  *	@info:		agp_kern_info pointer.  The caller should insure that this pointer is valid.
360  *
361  *	This function copies information about the agp bridge device and the state of
362  *	the agp backend into an agp_kern_info pointer.
363  */
364 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
365 {
366 	memset(info, 0, sizeof(struct agp_kern_info));
367 	if (!bridge) {
368 		info->chipset = NOT_SUPPORTED;
369 		return -EIO;
370 	}
371 
372 	info->version.major = bridge->version->major;
373 	info->version.minor = bridge->version->minor;
374 	info->chipset = SUPPORTED;
375 	info->device = bridge->dev;
376 	if (bridge->mode & AGPSTAT_MODE_3_0)
377 		info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
378 	else
379 		info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
380 	info->aper_base = bridge->gart_bus_addr;
381 	info->aper_size = agp_return_size();
382 	info->max_memory = bridge->max_memory_agp;
383 	info->current_memory = atomic_read(&bridge->current_memory_agp);
384 	info->cant_use_aperture = bridge->driver->cant_use_aperture;
385 	info->vm_ops = bridge->vm_ops;
386 	info->page_mask = ~0UL;
387 	return 0;
388 }
389 EXPORT_SYMBOL(agp_copy_info);
390 
391 /* End - Routine to copy over information structure */
392 
393 /*
394  * Routines for handling swapping of agp_memory into the GATT -
395  * These routines take agp_memory and insert them into the GATT.
396  * They call device specific routines to actually write to the GATT.
397  */
398 
399 /**
400  *	agp_bind_memory  -  Bind an agp_memory structure into the GATT.
401  *
402  *	@curr:		agp_memory pointer
403  *	@pg_start:	an offset into the graphics aperture translation table
404  *
405  *	It returns -EINVAL if the pointer == NULL.
406  *	It returns -EBUSY if the area of the table requested is already in use.
407  */
408 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
409 {
410 	int ret_val;
411 
412 	if (curr == NULL)
413 		return -EINVAL;
414 
415 	if (curr->is_bound) {
416 		printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
417 		return -EINVAL;
418 	}
419 	if (!curr->is_flushed) {
420 		curr->bridge->driver->cache_flush();
421 		curr->is_flushed = true;
422 	}
423 
424 	ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
425 
426 	if (ret_val != 0)
427 		return ret_val;
428 
429 	curr->is_bound = true;
430 	curr->pg_start = pg_start;
431 	spin_lock(&agp_bridge->mapped_lock);
432 	list_add(&curr->mapped_list, &agp_bridge->mapped_list);
433 	spin_unlock(&agp_bridge->mapped_lock);
434 
435 	return 0;
436 }
437 EXPORT_SYMBOL(agp_bind_memory);
438 
439 
440 /**
441  *	agp_unbind_memory  -  Removes an agp_memory structure from the GATT
442  *
443  * @curr:	agp_memory pointer to be removed from the GATT.
444  *
445  * It returns -EINVAL if this piece of agp_memory is not currently bound to
446  * the graphics aperture translation table or if the agp_memory pointer == NULL
447  */
448 int agp_unbind_memory(struct agp_memory *curr)
449 {
450 	int ret_val;
451 
452 	if (curr == NULL)
453 		return -EINVAL;
454 
455 	if (!curr->is_bound) {
456 		printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
457 		return -EINVAL;
458 	}
459 
460 	ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
461 
462 	if (ret_val != 0)
463 		return ret_val;
464 
465 	curr->is_bound = false;
466 	curr->pg_start = 0;
467 	spin_lock(&curr->bridge->mapped_lock);
468 	list_del(&curr->mapped_list);
469 	spin_unlock(&curr->bridge->mapped_lock);
470 	return 0;
471 }
472 EXPORT_SYMBOL(agp_unbind_memory);
473 
474 
475 /* End - Routines for handling swapping of agp_memory into the GATT */
476 
477 
478 /* Generic Agp routines - Start */
479 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
480 {
481 	u32 tmp;
482 
483 	if (*requested_mode & AGP2_RESERVED_MASK) {
484 		printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
485 			*requested_mode & AGP2_RESERVED_MASK, *requested_mode);
486 		*requested_mode &= ~AGP2_RESERVED_MASK;
487 	}
488 
489 	/*
490 	 * Some dumb bridges are programmed to disobey the AGP2 spec.
491 	 * This is likely a BIOS misprogramming rather than poweron default, or
492 	 * it would be a lot more common.
493 	 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
494 	 * AGPv2 spec 6.1.9 states:
495 	 *   The RATE field indicates the data transfer rates supported by this
496 	 *   device. A.G.P. devices must report all that apply.
497 	 * Fix them up as best we can.
498 	 */
499 	switch (*bridge_agpstat & 7) {
500 	case 4:
501 		*bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
502 		printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate. "
503 			"Fixing up support for x2 & x1\n");
504 		break;
505 	case 2:
506 		*bridge_agpstat |= AGPSTAT2_1X;
507 		printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate. "
508 			"Fixing up support for x1\n");
509 		break;
510 	default:
511 		break;
512 	}
513 
514 	/* Check the speed bits make sense. Only one should be set. */
515 	tmp = *requested_mode & 7;
516 	switch (tmp) {
517 		case 0:
518 			printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
519 			*requested_mode |= AGPSTAT2_1X;
520 			break;
521 		case 1:
522 		case 2:
523 			break;
524 		case 3:
525 			*requested_mode &= ~(AGPSTAT2_1X);	/* rate=2 */
526 			break;
527 		case 4:
528 			break;
529 		case 5:
530 		case 6:
531 		case 7:
532 			*requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
533 			break;
534 	}
535 
536 	/* disable SBA if it's not supported */
537 	if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
538 		*bridge_agpstat &= ~AGPSTAT_SBA;
539 
540 	/* Set rate */
541 	if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
542 		*bridge_agpstat &= ~AGPSTAT2_4X;
543 
544 	if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
545 		*bridge_agpstat &= ~AGPSTAT2_2X;
546 
547 	if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
548 		*bridge_agpstat &= ~AGPSTAT2_1X;
549 
550 	/* Now we know what mode it should be, clear out the unwanted bits. */
551 	if (*bridge_agpstat & AGPSTAT2_4X)
552 		*bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);	/* 4X */
553 
554 	if (*bridge_agpstat & AGPSTAT2_2X)
555 		*bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);	/* 2X */
556 
557 	if (*bridge_agpstat & AGPSTAT2_1X)
558 		*bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);	/* 1X */
559 
560 	/* Apply any errata. */
561 	if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
562 		*bridge_agpstat &= ~AGPSTAT_FW;
563 
564 	if (agp_bridge->flags & AGP_ERRATA_SBA)
565 		*bridge_agpstat &= ~AGPSTAT_SBA;
566 
567 	if (agp_bridge->flags & AGP_ERRATA_1X) {
568 		*bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
569 		*bridge_agpstat |= AGPSTAT2_1X;
570 	}
571 
572 	/* If we've dropped down to 1X, disable fast writes. */
573 	if (*bridge_agpstat & AGPSTAT2_1X)
574 		*bridge_agpstat &= ~AGPSTAT_FW;
575 }
576 
577 /*
578  * requested_mode = Mode requested by (typically) X.
579  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
580  * vga_agpstat = PCI_AGP_STATUS from graphic card.
581  */
582 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
583 {
584 	u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
585 	u32 tmp;
586 
587 	if (*requested_mode & AGP3_RESERVED_MASK) {
588 		printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
589 			*requested_mode & AGP3_RESERVED_MASK, *requested_mode);
590 		*requested_mode &= ~AGP3_RESERVED_MASK;
591 	}
592 
593 	/* Check the speed bits make sense. */
594 	tmp = *requested_mode & 7;
595 	if (tmp == 0) {
596 		printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
597 		*requested_mode |= AGPSTAT3_4X;
598 	}
599 	if (tmp >= 3) {
600 		printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
601 		*requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
602 	}
603 
604 	/* ARQSZ - Set the value to the maximum one.
605 	 * Don't allow the mode register to override values. */
606 	*bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
607 		max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
608 
609 	/* Calibration cycle.
610 	 * Don't allow the mode register to override values. */
611 	*bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
612 		min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
613 
614 	/* SBA *must* be supported for AGP v3 */
615 	*bridge_agpstat |= AGPSTAT_SBA;
616 
617 	/*
618 	 * Set speed.
619 	 * Check for invalid speeds. This can happen when applications
620 	 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
621 	 */
622 	if (*requested_mode & AGPSTAT_MODE_3_0) {
623 		/*
624 		 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
625 		 * have been passed a 3.0 mode, but with 2.x speed bits set.
626 		 * AGP2.x 4x -> AGP3.0 4x.
627 		 */
628 		if (*requested_mode & AGPSTAT2_4X) {
629 			printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
630 						current->comm, *requested_mode);
631 			*requested_mode &= ~AGPSTAT2_4X;
632 			*requested_mode |= AGPSTAT3_4X;
633 		}
634 	} else {
635 		/*
636 		 * The caller doesn't know what they are doing. We are in 3.0 mode,
637 		 * but have been passed an AGP 2.x mode.
638 		 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
639 		 */
640 		printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
641 					current->comm, *requested_mode);
642 		*requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
643 		*requested_mode |= AGPSTAT3_4X;
644 	}
645 
646 	if (*requested_mode & AGPSTAT3_8X) {
647 		if (!(*bridge_agpstat & AGPSTAT3_8X)) {
648 			*bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
649 			*bridge_agpstat |= AGPSTAT3_4X;
650 			printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
651 			return;
652 		}
653 		if (!(*vga_agpstat & AGPSTAT3_8X)) {
654 			*bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
655 			*bridge_agpstat |= AGPSTAT3_4X;
656 			printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
657 			return;
658 		}
659 		/* All set, bridge & device can do AGP x8*/
660 		*bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
661 		goto done;
662 
663 	} else if (*requested_mode & AGPSTAT3_4X) {
664 		*bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
665 		*bridge_agpstat |= AGPSTAT3_4X;
666 		goto done;
667 
668 	} else {
669 
670 		/*
671 		 * If we didn't specify an AGP mode, we see if both
672 		 * the graphics card, and the bridge can do x8, and use if so.
673 		 * If not, we fall back to x4 mode.
674 		 */
675 		if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
676 			printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
677 				"supported by bridge & card (x8).\n");
678 			*bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
679 			*vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
680 		} else {
681 			printk(KERN_INFO PFX "Fell back to AGPx4 mode because ");
682 			if (!(*bridge_agpstat & AGPSTAT3_8X)) {
683 				printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
684 					*bridge_agpstat, origbridge);
685 				*bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
686 				*bridge_agpstat |= AGPSTAT3_4X;
687 			}
688 			if (!(*vga_agpstat & AGPSTAT3_8X)) {
689 				printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
690 					*vga_agpstat, origvga);
691 				*vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
692 				*vga_agpstat |= AGPSTAT3_4X;
693 			}
694 		}
695 	}
696 
697 done:
698 	/* Apply any errata. */
699 	if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
700 		*bridge_agpstat &= ~AGPSTAT_FW;
701 
702 	if (agp_bridge->flags & AGP_ERRATA_SBA)
703 		*bridge_agpstat &= ~AGPSTAT_SBA;
704 
705 	if (agp_bridge->flags & AGP_ERRATA_1X) {
706 		*bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
707 		*bridge_agpstat |= AGPSTAT2_1X;
708 	}
709 }
710 
711 
712 /**
713  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
714  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
715  * @requested_mode: requested agp_stat from userspace (Typically from X)
716  * @bridge_agpstat: current agp_stat from AGP bridge.
717  *
718  * This function will hunt for an AGP graphics card, and try to match
719  * the requested mode to the capabilities of both the bridge and the card.
720  */
721 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
722 {
723 	struct pci_dev *device = NULL;
724 	u32 vga_agpstat;
725 	u8 cap_ptr;
726 
727 	for (;;) {
728 		device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
729 		if (!device) {
730 			printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
731 			return 0;
732 		}
733 		cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
734 		if (cap_ptr)
735 			break;
736 	}
737 
738 	/*
739 	 * Ok, here we have a AGP device. Disable impossible
740 	 * settings, and adjust the readqueue to the minimum.
741 	 */
742 	pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
743 
744 	/* adjust RQ depth */
745 	bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
746 	     min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
747 		 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
748 
749 	/* disable FW if it's not supported */
750 	if (!((bridge_agpstat & AGPSTAT_FW) &&
751 		 (vga_agpstat & AGPSTAT_FW) &&
752 		 (requested_mode & AGPSTAT_FW)))
753 		bridge_agpstat &= ~AGPSTAT_FW;
754 
755 	/* Check to see if we are operating in 3.0 mode */
756 	if (agp_bridge->mode & AGPSTAT_MODE_3_0)
757 		agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
758 	else
759 		agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
760 
761 	pci_dev_put(device);
762 	return bridge_agpstat;
763 }
764 EXPORT_SYMBOL(agp_collect_device_status);
765 
766 
767 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
768 {
769 	struct pci_dev *device = NULL;
770 	int mode;
771 
772 	mode = bridge_agpstat & 0x7;
773 	if (agp_v3)
774 		mode *= 4;
775 
776 	for_each_pci_dev(device) {
777 		u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
778 		if (!agp)
779 			continue;
780 
781 		dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
782 			 agp_v3 ? 3 : 2, mode);
783 		pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
784 	}
785 }
786 EXPORT_SYMBOL(agp_device_command);
787 
788 
789 void get_agp_version(struct agp_bridge_data *bridge)
790 {
791 	u32 ncapid;
792 
793 	/* Exit early if already set by errata workarounds. */
794 	if (bridge->major_version != 0)
795 		return;
796 
797 	pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
798 	bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
799 	bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
800 }
801 EXPORT_SYMBOL(get_agp_version);
802 
803 
804 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
805 {
806 	u32 bridge_agpstat, temp;
807 
808 	get_agp_version(agp_bridge);
809 
810 	dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
811 		 agp_bridge->major_version, agp_bridge->minor_version);
812 
813 	pci_read_config_dword(agp_bridge->dev,
814 		      agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
815 
816 	bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
817 	if (bridge_agpstat == 0)
818 		/* Something bad happened. FIXME: Return error code? */
819 		return;
820 
821 	bridge_agpstat |= AGPSTAT_AGP_ENABLE;
822 
823 	/* Do AGP version specific frobbing. */
824 	if (bridge->major_version >= 3) {
825 		if (bridge->mode & AGPSTAT_MODE_3_0) {
826 			/* If we have 3.5, we can do the isoch stuff. */
827 			if (bridge->minor_version >= 5)
828 				agp_3_5_enable(bridge);
829 			agp_device_command(bridge_agpstat, true);
830 			return;
831 		} else {
832 		    /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
833 		    bridge_agpstat &= ~(7<<10) ;
834 		    pci_read_config_dword(bridge->dev,
835 					bridge->capndx+AGPCTRL, &temp);
836 		    temp |= (1<<9);
837 		    pci_write_config_dword(bridge->dev,
838 					bridge->capndx+AGPCTRL, temp);
839 
840 		    dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
841 		}
842 	}
843 
844 	/* AGP v<3 */
845 	agp_device_command(bridge_agpstat, false);
846 }
847 EXPORT_SYMBOL(agp_generic_enable);
848 
849 
850 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
851 {
852 	char *table;
853 	char *table_end;
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 	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 				page_order =
874 				    A_SIZE_8(temp)->page_order;
875 				num_entries =
876 				    A_SIZE_8(temp)->num_entries;
877 				break;
878 			case U16_APER_SIZE:
879 				page_order = A_SIZE_16(temp)->page_order;
880 				num_entries = A_SIZE_16(temp)->num_entries;
881 				break;
882 			case U32_APER_SIZE:
883 				page_order = A_SIZE_32(temp)->page_order;
884 				num_entries = A_SIZE_32(temp)->num_entries;
885 				break;
886 				/* This case will never really happen. */
887 			case FIXED_APER_SIZE:
888 			case LVL2_APER_SIZE:
889 			default:
890 				page_order = num_entries = 0;
891 				break;
892 			}
893 
894 			table = alloc_gatt_pages(page_order);
895 
896 			if (table == NULL) {
897 				i++;
898 				switch (bridge->driver->size_type) {
899 				case U8_APER_SIZE:
900 					bridge->current_size = A_IDX8(bridge);
901 					break;
902 				case U16_APER_SIZE:
903 					bridge->current_size = A_IDX16(bridge);
904 					break;
905 				case U32_APER_SIZE:
906 					bridge->current_size = A_IDX32(bridge);
907 					break;
908 				/* These cases will never really happen. */
909 				case FIXED_APER_SIZE:
910 				case LVL2_APER_SIZE:
911 				default:
912 					break;
913 				}
914 				temp = bridge->current_size;
915 			} else {
916 				bridge->aperture_size_idx = i;
917 			}
918 		} while (!table && (i < bridge->driver->num_aperture_sizes));
919 	} else {
920 		page_order = ((struct aper_size_info_fixed *) temp)->page_order;
921 		num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
922 		table = alloc_gatt_pages(page_order);
923 	}
924 
925 	if (table == NULL)
926 		return -ENOMEM;
927 
928 	table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
929 
930 	for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
931 		SetPageReserved(page);
932 
933 	bridge->gatt_table_real = (u32 *) table;
934 	agp_gatt_table = (void *)table;
935 
936 	bridge->driver->cache_flush();
937 #ifdef CONFIG_X86
938 	if (set_memory_uc((unsigned long)table, 1 << page_order))
939 		printk(KERN_WARNING "Could not set GATT table memory to UC!\n");
940 
941 	bridge->gatt_table = (u32 __iomem *)table;
942 #else
943 	bridge->gatt_table = ioremap(virt_to_phys(table),
944 					(PAGE_SIZE * (1 << page_order)));
945 	bridge->driver->cache_flush();
946 #endif
947 
948 	if (bridge->gatt_table == NULL) {
949 		for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
950 			ClearPageReserved(page);
951 
952 		free_gatt_pages(table, page_order);
953 
954 		return -ENOMEM;
955 	}
956 	bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
957 
958 	/* AK: bogus, should encode addresses > 4GB */
959 	for (i = 0; i < num_entries; i++) {
960 		writel(bridge->scratch_page, bridge->gatt_table+i);
961 		readl(bridge->gatt_table+i);	/* PCI Posting. */
962 	}
963 
964 	return 0;
965 }
966 EXPORT_SYMBOL(agp_generic_create_gatt_table);
967 
968 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
969 {
970 	int page_order;
971 	char *table, *table_end;
972 	void *temp;
973 	struct page *page;
974 
975 	temp = bridge->current_size;
976 
977 	switch (bridge->driver->size_type) {
978 	case U8_APER_SIZE:
979 		page_order = A_SIZE_8(temp)->page_order;
980 		break;
981 	case U16_APER_SIZE:
982 		page_order = A_SIZE_16(temp)->page_order;
983 		break;
984 	case U32_APER_SIZE:
985 		page_order = A_SIZE_32(temp)->page_order;
986 		break;
987 	case FIXED_APER_SIZE:
988 		page_order = A_SIZE_FIX(temp)->page_order;
989 		break;
990 	case LVL2_APER_SIZE:
991 		/* The generic routines can't deal with 2 level gatt's */
992 		return -EINVAL;
993 	default:
994 		page_order = 0;
995 		break;
996 	}
997 
998 	/* Do not worry about freeing memory, because if this is
999 	 * called, then all agp memory is deallocated and removed
1000 	 * from the table. */
1001 
1002 #ifdef CONFIG_X86
1003 	set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1004 #else
1005 	iounmap(bridge->gatt_table);
1006 #endif
1007 	table = (char *) bridge->gatt_table_real;
1008 	table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1009 
1010 	for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1011 		ClearPageReserved(page);
1012 
1013 	free_gatt_pages(bridge->gatt_table_real, page_order);
1014 
1015 	agp_gatt_table = NULL;
1016 	bridge->gatt_table = NULL;
1017 	bridge->gatt_table_real = NULL;
1018 	bridge->gatt_bus_addr = 0;
1019 
1020 	return 0;
1021 }
1022 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1023 
1024 
1025 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1026 {
1027 	int num_entries;
1028 	size_t i;
1029 	off_t j;
1030 	void *temp;
1031 	struct agp_bridge_data *bridge;
1032 	int mask_type;
1033 
1034 	bridge = mem->bridge;
1035 	if (!bridge)
1036 		return -EINVAL;
1037 
1038 	if (mem->page_count == 0)
1039 		return 0;
1040 
1041 	temp = bridge->current_size;
1042 
1043 	switch (bridge->driver->size_type) {
1044 	case U8_APER_SIZE:
1045 		num_entries = A_SIZE_8(temp)->num_entries;
1046 		break;
1047 	case U16_APER_SIZE:
1048 		num_entries = A_SIZE_16(temp)->num_entries;
1049 		break;
1050 	case U32_APER_SIZE:
1051 		num_entries = A_SIZE_32(temp)->num_entries;
1052 		break;
1053 	case FIXED_APER_SIZE:
1054 		num_entries = A_SIZE_FIX(temp)->num_entries;
1055 		break;
1056 	case LVL2_APER_SIZE:
1057 		/* The generic routines can't deal with 2 level gatt's */
1058 		return -EINVAL;
1059 	default:
1060 		num_entries = 0;
1061 		break;
1062 	}
1063 
1064 	num_entries -= agp_memory_reserved/PAGE_SIZE;
1065 	if (num_entries < 0) num_entries = 0;
1066 
1067 	if (type != mem->type)
1068 		return -EINVAL;
1069 
1070 	mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1071 	if (mask_type != 0) {
1072 		/* The generic routines know nothing of memory types */
1073 		return -EINVAL;
1074 	}
1075 
1076 	if (((pg_start + mem->page_count) > num_entries) ||
1077 	    ((pg_start + mem->page_count) < pg_start))
1078 		return -EINVAL;
1079 
1080 	j = pg_start;
1081 
1082 	while (j < (pg_start + mem->page_count)) {
1083 		if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1084 			return -EBUSY;
1085 		j++;
1086 	}
1087 
1088 	if (!mem->is_flushed) {
1089 		bridge->driver->cache_flush();
1090 		mem->is_flushed = true;
1091 	}
1092 
1093 	for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1094 		writel(bridge->driver->mask_memory(bridge,
1095 						   page_to_phys(mem->pages[i]),
1096 						   mask_type),
1097 		       bridge->gatt_table+j);
1098 	}
1099 	readl(bridge->gatt_table+j-1);	/* PCI Posting. */
1100 
1101 	bridge->driver->tlb_flush(mem);
1102 	return 0;
1103 }
1104 EXPORT_SYMBOL(agp_generic_insert_memory);
1105 
1106 
1107 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1108 {
1109 	size_t i;
1110 	struct agp_bridge_data *bridge;
1111 	int mask_type, num_entries;
1112 
1113 	bridge = mem->bridge;
1114 	if (!bridge)
1115 		return -EINVAL;
1116 
1117 	if (mem->page_count == 0)
1118 		return 0;
1119 
1120 	if (type != mem->type)
1121 		return -EINVAL;
1122 
1123 	num_entries = agp_num_entries();
1124 	if (((pg_start + mem->page_count) > num_entries) ||
1125 	    ((pg_start + mem->page_count) < pg_start))
1126 		return -EINVAL;
1127 
1128 	mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1129 	if (mask_type != 0) {
1130 		/* The generic routines know nothing of memory types */
1131 		return -EINVAL;
1132 	}
1133 
1134 	/* AK: bogus, should encode addresses > 4GB */
1135 	for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1136 		writel(bridge->scratch_page, bridge->gatt_table+i);
1137 	}
1138 	readl(bridge->gatt_table+i-1);	/* PCI Posting. */
1139 
1140 	bridge->driver->tlb_flush(mem);
1141 	return 0;
1142 }
1143 EXPORT_SYMBOL(agp_generic_remove_memory);
1144 
1145 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1146 {
1147 	return NULL;
1148 }
1149 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1150 
1151 void agp_generic_free_by_type(struct agp_memory *curr)
1152 {
1153 	agp_free_page_array(curr);
1154 	agp_free_key(curr->key);
1155 	kfree(curr);
1156 }
1157 EXPORT_SYMBOL(agp_generic_free_by_type);
1158 
1159 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1160 {
1161 	struct agp_memory *new;
1162 	int i;
1163 	int pages;
1164 
1165 	pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1166 	new = agp_create_user_memory(page_count);
1167 	if (new == NULL)
1168 		return NULL;
1169 
1170 	for (i = 0; i < page_count; i++)
1171 		new->pages[i] = NULL;
1172 	new->page_count = 0;
1173 	new->type = type;
1174 	new->num_scratch_pages = pages;
1175 
1176 	return new;
1177 }
1178 EXPORT_SYMBOL(agp_generic_alloc_user);
1179 
1180 /*
1181  * Basic Page Allocation Routines -
1182  * These routines handle page allocation and by default they reserve the allocated
1183  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1184  * against a maximum value.
1185  */
1186 
1187 int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1188 {
1189 	struct page * page;
1190 	int i, ret = -ENOMEM;
1191 
1192 	for (i = 0; i < num_pages; i++) {
1193 		page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1194 		/* agp_free_memory() needs gart address */
1195 		if (page == NULL)
1196 			goto out;
1197 
1198 #ifndef CONFIG_X86
1199 		map_page_into_agp(page);
1200 #endif
1201 		get_page(page);
1202 		atomic_inc(&agp_bridge->current_memory_agp);
1203 
1204 		mem->pages[i] = page;
1205 		mem->page_count++;
1206 	}
1207 
1208 #ifdef CONFIG_X86
1209 	set_pages_array_uc(mem->pages, num_pages);
1210 #endif
1211 	ret = 0;
1212 out:
1213 	return ret;
1214 }
1215 EXPORT_SYMBOL(agp_generic_alloc_pages);
1216 
1217 struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1218 {
1219 	struct page * page;
1220 
1221 	page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1222 	if (page == NULL)
1223 		return NULL;
1224 
1225 	map_page_into_agp(page);
1226 
1227 	get_page(page);
1228 	atomic_inc(&agp_bridge->current_memory_agp);
1229 	return page;
1230 }
1231 EXPORT_SYMBOL(agp_generic_alloc_page);
1232 
1233 void agp_generic_destroy_pages(struct agp_memory *mem)
1234 {
1235 	int i;
1236 	struct page *page;
1237 
1238 	if (!mem)
1239 		return;
1240 
1241 #ifdef CONFIG_X86
1242 	set_pages_array_wb(mem->pages, mem->page_count);
1243 #endif
1244 
1245 	for (i = 0; i < mem->page_count; i++) {
1246 		page = mem->pages[i];
1247 
1248 #ifndef CONFIG_X86
1249 		unmap_page_from_agp(page);
1250 #endif
1251 		put_page(page);
1252 		__free_page(page);
1253 		atomic_dec(&agp_bridge->current_memory_agp);
1254 		mem->pages[i] = NULL;
1255 	}
1256 }
1257 EXPORT_SYMBOL(agp_generic_destroy_pages);
1258 
1259 void agp_generic_destroy_page(struct page *page, int flags)
1260 {
1261 	if (page == NULL)
1262 		return;
1263 
1264 	if (flags & AGP_PAGE_DESTROY_UNMAP)
1265 		unmap_page_from_agp(page);
1266 
1267 	if (flags & AGP_PAGE_DESTROY_FREE) {
1268 		put_page(page);
1269 		__free_page(page);
1270 		atomic_dec(&agp_bridge->current_memory_agp);
1271 	}
1272 }
1273 EXPORT_SYMBOL(agp_generic_destroy_page);
1274 
1275 /* End Basic Page Allocation Routines */
1276 
1277 
1278 /**
1279  * agp_enable  -  initialise the agp point-to-point connection.
1280  *
1281  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
1282  * @mode:	agp mode register value to configure with.
1283  */
1284 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1285 {
1286 	if (!bridge)
1287 		return;
1288 	bridge->driver->agp_enable(bridge, mode);
1289 }
1290 EXPORT_SYMBOL(agp_enable);
1291 
1292 /* When we remove the global variable agp_bridge from all drivers
1293  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1294  */
1295 
1296 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1297 {
1298 	if (list_empty(&agp_bridges))
1299 		return NULL;
1300 
1301 	return agp_bridge;
1302 }
1303 
1304 static void ipi_handler(void *null)
1305 {
1306 	flush_agp_cache();
1307 }
1308 
1309 void global_cache_flush(void)
1310 {
1311 	on_each_cpu(ipi_handler, NULL, 1);
1312 }
1313 EXPORT_SYMBOL(global_cache_flush);
1314 
1315 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1316 				      dma_addr_t addr, int type)
1317 {
1318 	/* memory type is ignored in the generic routine */
1319 	if (bridge->driver->masks)
1320 		return addr | bridge->driver->masks[0].mask;
1321 	else
1322 		return addr;
1323 }
1324 EXPORT_SYMBOL(agp_generic_mask_memory);
1325 
1326 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1327 				  int type)
1328 {
1329 	if (type >= AGP_USER_TYPES)
1330 		return 0;
1331 	return type;
1332 }
1333 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1334 
1335 /*
1336  * These functions are implemented according to the AGPv3 spec,
1337  * which covers implementation details that had previously been
1338  * left open.
1339  */
1340 
1341 int agp3_generic_fetch_size(void)
1342 {
1343 	u16 temp_size;
1344 	int i;
1345 	struct aper_size_info_16 *values;
1346 
1347 	pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1348 	values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1349 
1350 	for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1351 		if (temp_size == values[i].size_value) {
1352 			agp_bridge->previous_size =
1353 				agp_bridge->current_size = (void *) (values + i);
1354 
1355 			agp_bridge->aperture_size_idx = i;
1356 			return values[i].size;
1357 		}
1358 	}
1359 	return 0;
1360 }
1361 EXPORT_SYMBOL(agp3_generic_fetch_size);
1362 
1363 void agp3_generic_tlbflush(struct agp_memory *mem)
1364 {
1365 	u32 ctrl;
1366 	pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1367 	pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1368 	pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1369 }
1370 EXPORT_SYMBOL(agp3_generic_tlbflush);
1371 
1372 int agp3_generic_configure(void)
1373 {
1374 	u32 temp;
1375 	struct aper_size_info_16 *current_size;
1376 
1377 	current_size = A_SIZE_16(agp_bridge->current_size);
1378 
1379 	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
1380 						    AGP_APERTURE_BAR);
1381 
1382 	/* set aperture size */
1383 	pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1384 	/* set gart pointer */
1385 	pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1386 	/* enable aperture and GTLB */
1387 	pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1388 	pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1389 	return 0;
1390 }
1391 EXPORT_SYMBOL(agp3_generic_configure);
1392 
1393 void agp3_generic_cleanup(void)
1394 {
1395 	u32 ctrl;
1396 	pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1397 	pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1398 }
1399 EXPORT_SYMBOL(agp3_generic_cleanup);
1400 
1401 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1402 {
1403 	{4096, 1048576, 10,0x000},
1404 	{2048,  524288, 9, 0x800},
1405 	{1024,  262144, 8, 0xc00},
1406 	{ 512,  131072, 7, 0xe00},
1407 	{ 256,   65536, 6, 0xf00},
1408 	{ 128,   32768, 5, 0xf20},
1409 	{  64,   16384, 4, 0xf30},
1410 	{  32,    8192, 3, 0xf38},
1411 	{  16,    4096, 2, 0xf3c},
1412 	{   8,    2048, 1, 0xf3e},
1413 	{   4,    1024, 0, 0xf3f}
1414 };
1415 EXPORT_SYMBOL(agp3_generic_sizes);
1416 
1417