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;
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 
agp_free_key(int key)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 
agp_get_key(void)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 
agp_alloc_page_array(size_t size,struct agp_memory * mem)90 void 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 }
100 EXPORT_SYMBOL(agp_alloc_page_array);
101 
agp_free_page_array(struct agp_memory * mem)102 void 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 }
110 EXPORT_SYMBOL(agp_free_page_array);
111 
112 
agp_create_user_memory(unsigned long num_agp_pages)113 static 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 
agp_create_memory(int scratch_pages)143 struct 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 }
169 EXPORT_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  */
agp_free_memory(struct agp_memory * curr)179 void 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 }
219 EXPORT_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  */
agp_allocate_memory(struct agp_bridge_data * bridge,size_t page_count,u32 type)234 struct 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 }
294 EXPORT_SYMBOL(agp_allocate_memory);
295 
296 
297 /* End - Generic routines for handling agp_memory structures */
298 
299 
agp_return_size(void)300 static 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 
agp_num_entries(void)335 int 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 }
368 EXPORT_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  */
agp_copy_info(struct agp_bridge_data * bridge,struct agp_kern_info * info)379 int 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 }
404 EXPORT_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  */
agp_bind_memory(struct agp_memory * curr,off_t pg_start)423 int 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 }
452 EXPORT_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  */
agp_unbind_memory(struct agp_memory * curr)463 int 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 }
487 EXPORT_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 */
agp_v2_parse_one(u32 * requested_mode,u32 * bridge_agpstat,u32 * vga_agpstat)494 static 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  */
agp_v3_parse_one(u32 * requested_mode,u32 * bridge_agpstat,u32 * vga_agpstat)597 static 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 
712 done:
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  */
agp_collect_device_status(struct agp_bridge_data * bridge,u32 requested_mode,u32 bridge_agpstat)736 u32 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 }
779 EXPORT_SYMBOL(agp_collect_device_status);
780 
781 
agp_device_command(u32 bridge_agpstat,bool agp_v3)782 void 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 }
801 EXPORT_SYMBOL(agp_device_command);
802 
803 
get_agp_version(struct agp_bridge_data * bridge)804 void 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 }
816 EXPORT_SYMBOL(get_agp_version);
817 
818 
agp_generic_enable(struct agp_bridge_data * bridge,u32 requested_mode)819 void 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 }
862 EXPORT_SYMBOL(agp_generic_enable);
863 
864 
agp_generic_create_gatt_table(struct agp_bridge_data * bridge)865 int 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!\n");
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 }
986 EXPORT_SYMBOL(agp_generic_create_gatt_table);
987 
agp_generic_free_gatt_table(struct agp_bridge_data * bridge)988 int 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 }
1043 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1044 
1045 
agp_generic_insert_memory(struct agp_memory * mem,off_t pg_start,int type)1046 int 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 }
1126 EXPORT_SYMBOL(agp_generic_insert_memory);
1127 
1128 
agp_generic_remove_memory(struct agp_memory * mem,off_t pg_start,int type)1129 int 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 }
1165 EXPORT_SYMBOL(agp_generic_remove_memory);
1166 
agp_generic_alloc_by_type(size_t page_count,int type)1167 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1168 {
1169 	return NULL;
1170 }
1171 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1172 
agp_generic_free_by_type(struct agp_memory * curr)1173 void 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 }
1179 EXPORT_SYMBOL(agp_generic_free_by_type);
1180 
agp_generic_alloc_user(size_t page_count,int type)1181 struct 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 }
1200 EXPORT_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 
agp_generic_alloc_pages(struct agp_bridge_data * bridge,struct agp_memory * mem,size_t num_pages)1209 int 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;
1234 out:
1235 	return ret;
1236 }
1237 EXPORT_SYMBOL(agp_generic_alloc_pages);
1238 
agp_generic_alloc_page(struct agp_bridge_data * bridge)1239 struct 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 }
1253 EXPORT_SYMBOL(agp_generic_alloc_page);
1254 
agp_generic_destroy_pages(struct agp_memory * mem)1255 void 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 }
1279 EXPORT_SYMBOL(agp_generic_destroy_pages);
1280 
agp_generic_destroy_page(struct page * page,int flags)1281 void 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 }
1295 EXPORT_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  */
agp_enable(struct agp_bridge_data * bridge,u32 mode)1305 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1306 {
1307 	if (!bridge)
1308 		return;
1309 	bridge->driver->agp_enable(bridge, mode);
1310 }
1311 EXPORT_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 
agp_generic_find_bridge(struct pci_dev * pdev)1317 struct 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 
ipi_handler(void * null)1325 static void ipi_handler(void *null)
1326 {
1327 	flush_agp_cache();
1328 }
1329 
global_cache_flush(void)1330 void 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 }
1335 EXPORT_SYMBOL(global_cache_flush);
1336 
agp_generic_mask_memory(struct agp_bridge_data * bridge,dma_addr_t addr,int type)1337 unsigned 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 }
1346 EXPORT_SYMBOL(agp_generic_mask_memory);
1347 
agp_generic_type_to_mask_type(struct agp_bridge_data * bridge,int type)1348 int 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 }
1355 EXPORT_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 
agp3_generic_fetch_size(void)1363 int 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 }
1383 EXPORT_SYMBOL(agp3_generic_fetch_size);
1384 
agp3_generic_tlbflush(struct agp_memory * mem)1385 void 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 }
1392 EXPORT_SYMBOL(agp3_generic_tlbflush);
1393 
agp3_generic_configure(void)1394 int 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 }
1413 EXPORT_SYMBOL(agp3_generic_configure);
1414 
agp3_generic_cleanup(void)1415 void 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 }
1421 EXPORT_SYMBOL(agp3_generic_cleanup);
1422 
1423 const 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 };
1437 EXPORT_SYMBOL(agp3_generic_sizes);
1438 
1439