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;
49 int 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  */
55 EXPORT_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 
agp_free_key(int key)62 void 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 }
70 EXPORT_SYMBOL(agp_free_key);
71 
72 
agp_get_key(void)73 static 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 
agp_alloc_page_array(size_t size,struct agp_memory * mem)91 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
92 {
93 	mem->pages = kvmalloc(size, GFP_KERNEL);
94 }
95 EXPORT_SYMBOL(agp_alloc_page_array);
96 
agp_create_user_memory(unsigned long num_agp_pages)97 static 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 
agp_create_memory(int scratch_pages)127 struct 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 }
153 EXPORT_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  */
agp_free_memory(struct agp_memory * curr)163 void 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 }
203 EXPORT_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  */
agp_allocate_memory(struct agp_bridge_data * bridge,size_t page_count,u32 type)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 
agp_return_size(void)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 
agp_num_entries(void)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  *	@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  */
agp_copy_info(struct agp_bridge_data * bridge,struct agp_kern_info * info)363 int 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 }
388 EXPORT_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  */
agp_bind_memory(struct agp_memory * curr,off_t pg_start)407 int 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 }
436 EXPORT_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  */
agp_unbind_memory(struct agp_memory * curr)447 int 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 }
471 EXPORT_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 */
agp_v2_parse_one(u32 * requested_mode,u32 * bridge_agpstat,u32 * vga_agpstat)478 static 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  */
agp_v3_parse_one(u32 * requested_mode,u32 * bridge_agpstat,u32 * vga_agpstat)581 static 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 
696 done:
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  */
agp_collect_device_status(struct agp_bridge_data * bridge,u32 requested_mode,u32 bridge_agpstat)720 u32 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 }
763 EXPORT_SYMBOL(agp_collect_device_status);
764 
765 
agp_device_command(u32 bridge_agpstat,bool agp_v3)766 void 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 }
785 EXPORT_SYMBOL(agp_device_command);
786 
787 
get_agp_version(struct agp_bridge_data * bridge)788 void 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 }
800 EXPORT_SYMBOL(get_agp_version);
801 
802 
agp_generic_enable(struct agp_bridge_data * bridge,u32 requested_mode)803 void 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 }
846 EXPORT_SYMBOL(agp_generic_enable);
847 
848 
agp_generic_create_gatt_table(struct agp_bridge_data * bridge)849 int 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 }
970 EXPORT_SYMBOL(agp_generic_create_gatt_table);
971 
agp_generic_free_gatt_table(struct agp_bridge_data * bridge)972 int 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 }
1026 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1027 
1028 
agp_generic_insert_memory(struct agp_memory * mem,off_t pg_start,int type)1029 int 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 }
1108 EXPORT_SYMBOL(agp_generic_insert_memory);
1109 
1110 
agp_generic_remove_memory(struct agp_memory * mem,off_t pg_start,int type)1111 int 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 }
1147 EXPORT_SYMBOL(agp_generic_remove_memory);
1148 
agp_generic_alloc_by_type(size_t page_count,int type)1149 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1150 {
1151 	return NULL;
1152 }
1153 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1154 
agp_generic_free_by_type(struct agp_memory * curr)1155 void 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 }
1161 EXPORT_SYMBOL(agp_generic_free_by_type);
1162 
agp_generic_alloc_user(size_t page_count,int type)1163 struct 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 }
1182 EXPORT_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 
agp_generic_alloc_pages(struct agp_bridge_data * bridge,struct agp_memory * mem,size_t num_pages)1191 int 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;
1216 out:
1217 	return ret;
1218 }
1219 EXPORT_SYMBOL(agp_generic_alloc_pages);
1220 
agp_generic_alloc_page(struct agp_bridge_data * bridge)1221 struct 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 }
1235 EXPORT_SYMBOL(agp_generic_alloc_page);
1236 
agp_generic_destroy_pages(struct agp_memory * mem)1237 void 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 }
1261 EXPORT_SYMBOL(agp_generic_destroy_pages);
1262 
agp_generic_destroy_page(struct page * page,int flags)1263 void 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 }
1277 EXPORT_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  */
agp_enable(struct agp_bridge_data * bridge,u32 mode)1287 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1288 {
1289 	if (!bridge)
1290 		return;
1291 	bridge->driver->agp_enable(bridge, mode);
1292 }
1293 EXPORT_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 
agp_generic_find_bridge(struct pci_dev * pdev)1299 struct 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 
ipi_handler(void * null)1307 static void ipi_handler(void *null)
1308 {
1309 	flush_agp_cache();
1310 }
1311 
global_cache_flush(void)1312 void global_cache_flush(void)
1313 {
1314 	if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1315 		panic(PFX "timed out waiting for the other CPUs!\n");
1316 }
1317 EXPORT_SYMBOL(global_cache_flush);
1318 
agp_generic_mask_memory(struct agp_bridge_data * bridge,dma_addr_t addr,int type)1319 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1320 				      dma_addr_t addr, int type)
1321 {
1322 	/* memory type is ignored in the generic routine */
1323 	if (bridge->driver->masks)
1324 		return addr | bridge->driver->masks[0].mask;
1325 	else
1326 		return addr;
1327 }
1328 EXPORT_SYMBOL(agp_generic_mask_memory);
1329 
agp_generic_type_to_mask_type(struct agp_bridge_data * bridge,int type)1330 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1331 				  int type)
1332 {
1333 	if (type >= AGP_USER_TYPES)
1334 		return 0;
1335 	return type;
1336 }
1337 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1338 
1339 /*
1340  * These functions are implemented according to the AGPv3 spec,
1341  * which covers implementation details that had previously been
1342  * left open.
1343  */
1344 
agp3_generic_fetch_size(void)1345 int agp3_generic_fetch_size(void)
1346 {
1347 	u16 temp_size;
1348 	int i;
1349 	struct aper_size_info_16 *values;
1350 
1351 	pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1352 	values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1353 
1354 	for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1355 		if (temp_size == values[i].size_value) {
1356 			agp_bridge->previous_size =
1357 				agp_bridge->current_size = (void *) (values + i);
1358 
1359 			agp_bridge->aperture_size_idx = i;
1360 			return values[i].size;
1361 		}
1362 	}
1363 	return 0;
1364 }
1365 EXPORT_SYMBOL(agp3_generic_fetch_size);
1366 
agp3_generic_tlbflush(struct agp_memory * mem)1367 void agp3_generic_tlbflush(struct agp_memory *mem)
1368 {
1369 	u32 ctrl;
1370 	pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1371 	pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1372 	pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1373 }
1374 EXPORT_SYMBOL(agp3_generic_tlbflush);
1375 
agp3_generic_configure(void)1376 int agp3_generic_configure(void)
1377 {
1378 	u32 temp;
1379 	struct aper_size_info_16 *current_size;
1380 
1381 	current_size = A_SIZE_16(agp_bridge->current_size);
1382 
1383 	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
1384 						    AGP_APERTURE_BAR);
1385 
1386 	/* set aperture size */
1387 	pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1388 	/* set gart pointer */
1389 	pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1390 	/* enable aperture and GTLB */
1391 	pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1392 	pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1393 	return 0;
1394 }
1395 EXPORT_SYMBOL(agp3_generic_configure);
1396 
agp3_generic_cleanup(void)1397 void agp3_generic_cleanup(void)
1398 {
1399 	u32 ctrl;
1400 	pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1401 	pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1402 }
1403 EXPORT_SYMBOL(agp3_generic_cleanup);
1404 
1405 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1406 {
1407 	{4096, 1048576, 10,0x000},
1408 	{2048,  524288, 9, 0x800},
1409 	{1024,  262144, 8, 0xc00},
1410 	{ 512,  131072, 7, 0xe00},
1411 	{ 256,   65536, 6, 0xf00},
1412 	{ 128,   32768, 5, 0xf20},
1413 	{  64,   16384, 4, 0xf30},
1414 	{  32,    8192, 3, 0xf38},
1415 	{  16,    4096, 2, 0xf3c},
1416 	{   8,    2048, 1, 0xf3e},
1417 	{   4,    1024, 0, 0xf3f}
1418 };
1419 EXPORT_SYMBOL(agp3_generic_sizes);
1420 
1421