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