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.
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:
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
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.
28 * - Allocate more than order 0 pages to avoid too much linear map splitting.
30 #include <linux/module.h>
31 #include <linux/pci.h>
32 #include <linux/pagemap.h>
33 #include <linux/miscdevice.h>
35 #include <linux/agp_backend.h>
36 #include <linux/vmalloc.h>
37 #include <linux/dma-mapping.h>
39 #include <linux/sched.h>
40 #include <linux/slab.h>
42 #include <asm/cacheflush.h>
43 #include <asm/pgtable.h>
46 __u32
*agp_gatt_table
;
47 int agp_memory_reserved
;
50 * Needed by the Nforce GART driver for the time being. Would be
51 * nice to do this some other way instead of needing this export.
53 EXPORT_SYMBOL_GPL(agp_memory_reserved
);
56 * Generic routines for handling agp_memory structures -
57 * They use the basic page allocation routines to do the brunt of the work.
60 void agp_free_key(int key
)
66 clear_bit(key
, agp_bridge
->key_list
);
68 EXPORT_SYMBOL(agp_free_key
);
71 static int agp_get_key(void)
75 bit
= find_first_zero_bit(agp_bridge
->key_list
, MAXKEY
);
77 set_bit(bit
, agp_bridge
->key_list
);
84 * Use kmalloc if possible for the page list. Otherwise fall back to
85 * vmalloc. This speeds things up and also saves memory for small AGP
89 void agp_alloc_page_array(size_t size
, struct agp_memory
*mem
)
93 if (size
<= 2*PAGE_SIZE
)
94 mem
->pages
= kmalloc(size
, GFP_KERNEL
| __GFP_NOWARN
);
95 if (mem
->pages
== NULL
) {
96 mem
->pages
= vmalloc(size
);
99 EXPORT_SYMBOL(agp_alloc_page_array
);
101 void agp_free_page_array(struct agp_memory
*mem
)
103 if (is_vmalloc_addr(mem
->pages
)) {
109 EXPORT_SYMBOL(agp_free_page_array
);
112 static struct agp_memory
*agp_create_user_memory(unsigned long num_agp_pages
)
114 struct agp_memory
*new;
115 unsigned long alloc_size
= num_agp_pages
*sizeof(struct page
*);
117 if (INT_MAX
/sizeof(struct page
*) < num_agp_pages
)
120 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
124 new->key
= agp_get_key();
131 agp_alloc_page_array(alloc_size
, new);
133 if (new->pages
== NULL
) {
134 agp_free_key(new->key
);
138 new->num_scratch_pages
= 0;
142 struct agp_memory
*agp_create_memory(int scratch_pages
)
144 struct agp_memory
*new;
146 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
150 new->key
= agp_get_key();
157 agp_alloc_page_array(PAGE_SIZE
* scratch_pages
, new);
159 if (new->pages
== NULL
) {
160 agp_free_key(new->key
);
164 new->num_scratch_pages
= scratch_pages
;
165 new->type
= AGP_NORMAL_MEMORY
;
168 EXPORT_SYMBOL(agp_create_memory
);
171 * agp_free_memory - free memory associated with an agp_memory pointer.
173 * @curr: agp_memory pointer to be freed.
175 * It is the only function that can be called when the backend is not owned
176 * by the caller. (So it can free memory on client death.)
178 void agp_free_memory(struct agp_memory
*curr
)
186 agp_unbind_memory(curr
);
188 if (curr
->type
>= AGP_USER_TYPES
) {
189 agp_generic_free_by_type(curr
);
193 if (curr
->type
!= 0) {
194 curr
->bridge
->driver
->free_by_type(curr
);
197 if (curr
->page_count
!= 0) {
198 if (curr
->bridge
->driver
->agp_destroy_pages
) {
199 curr
->bridge
->driver
->agp_destroy_pages(curr
);
202 for (i
= 0; i
< curr
->page_count
; i
++) {
203 curr
->bridge
->driver
->agp_destroy_page(
205 AGP_PAGE_DESTROY_UNMAP
);
207 for (i
= 0; i
< curr
->page_count
; i
++) {
208 curr
->bridge
->driver
->agp_destroy_page(
210 AGP_PAGE_DESTROY_FREE
);
214 agp_free_key(curr
->key
);
215 agp_free_page_array(curr
);
218 EXPORT_SYMBOL(agp_free_memory
);
220 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
223 * agp_allocate_memory - allocate a group of pages of a certain type.
225 * @page_count: size_t argument of the number of pages
226 * @type: u32 argument of the type of memory to be allocated.
228 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
229 * maps to physical ram. Any other type is device dependent.
231 * It returns NULL whenever memory is unavailable.
233 struct agp_memory
*agp_allocate_memory(struct agp_bridge_data
*bridge
,
234 size_t page_count
, u32 type
)
237 struct agp_memory
*new;
244 cur_memory
= atomic_read(&bridge
->current_memory_agp
);
245 if ((cur_memory
+ page_count
> bridge
->max_memory_agp
) ||
246 (cur_memory
+ page_count
< page_count
))
249 if (type
>= AGP_USER_TYPES
) {
250 new = agp_generic_alloc_user(page_count
, type
);
252 new->bridge
= bridge
;
257 new = bridge
->driver
->alloc_by_type(page_count
, type
);
259 new->bridge
= bridge
;
263 scratch_pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
265 new = agp_create_memory(scratch_pages
);
270 if (bridge
->driver
->agp_alloc_pages
) {
271 if (bridge
->driver
->agp_alloc_pages(bridge
, new, page_count
)) {
272 agp_free_memory(new);
275 new->bridge
= bridge
;
279 for (i
= 0; i
< page_count
; i
++) {
280 struct page
*page
= bridge
->driver
->agp_alloc_page(bridge
);
283 agp_free_memory(new);
286 new->pages
[i
] = page
;
289 new->bridge
= bridge
;
293 EXPORT_SYMBOL(agp_allocate_memory
);
296 /* End - Generic routines for handling agp_memory structures */
299 static int agp_return_size(void)
304 temp
= agp_bridge
->current_size
;
306 switch (agp_bridge
->driver
->size_type
) {
308 current_size
= A_SIZE_8(temp
)->size
;
311 current_size
= A_SIZE_16(temp
)->size
;
314 current_size
= A_SIZE_32(temp
)->size
;
317 current_size
= A_SIZE_LVL2(temp
)->size
;
319 case FIXED_APER_SIZE
:
320 current_size
= A_SIZE_FIX(temp
)->size
;
327 current_size
-= (agp_memory_reserved
/ (1024*1024));
334 int agp_num_entries(void)
339 temp
= agp_bridge
->current_size
;
341 switch (agp_bridge
->driver
->size_type
) {
343 num_entries
= A_SIZE_8(temp
)->num_entries
;
346 num_entries
= A_SIZE_16(temp
)->num_entries
;
349 num_entries
= A_SIZE_32(temp
)->num_entries
;
352 num_entries
= A_SIZE_LVL2(temp
)->num_entries
;
354 case FIXED_APER_SIZE
:
355 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
362 num_entries
-= agp_memory_reserved
>>PAGE_SHIFT
;
367 EXPORT_SYMBOL_GPL(agp_num_entries
);
371 * agp_copy_info - copy bridge state information
373 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
375 * This function copies information about the agp bridge device and the state of
376 * the agp backend into an agp_kern_info pointer.
378 int agp_copy_info(struct agp_bridge_data
*bridge
, struct agp_kern_info
*info
)
380 memset(info
, 0, sizeof(struct agp_kern_info
));
382 info
->chipset
= NOT_SUPPORTED
;
386 info
->version
.major
= bridge
->version
->major
;
387 info
->version
.minor
= bridge
->version
->minor
;
388 info
->chipset
= SUPPORTED
;
389 info
->device
= bridge
->dev
;
390 if (bridge
->mode
& AGPSTAT_MODE_3_0
)
391 info
->mode
= bridge
->mode
& ~AGP3_RESERVED_MASK
;
393 info
->mode
= bridge
->mode
& ~AGP2_RESERVED_MASK
;
394 info
->aper_base
= bridge
->gart_bus_addr
;
395 info
->aper_size
= agp_return_size();
396 info
->max_memory
= bridge
->max_memory_agp
;
397 info
->current_memory
= atomic_read(&bridge
->current_memory_agp
);
398 info
->cant_use_aperture
= bridge
->driver
->cant_use_aperture
;
399 info
->vm_ops
= bridge
->vm_ops
;
400 info
->page_mask
= ~0UL;
403 EXPORT_SYMBOL(agp_copy_info
);
405 /* End - Routine to copy over information structure */
408 * Routines for handling swapping of agp_memory into the GATT -
409 * These routines take agp_memory and insert them into the GATT.
410 * They call device specific routines to actually write to the GATT.
414 * agp_bind_memory - Bind an agp_memory structure into the GATT.
416 * @curr: agp_memory pointer
417 * @pg_start: an offset into the graphics aperture translation table
419 * It returns -EINVAL if the pointer == NULL.
420 * It returns -EBUSY if the area of the table requested is already in use.
422 int agp_bind_memory(struct agp_memory
*curr
, off_t pg_start
)
429 if (curr
->is_bound
) {
430 printk(KERN_INFO PFX
"memory %p is already bound!\n", curr
);
433 if (!curr
->is_flushed
) {
434 curr
->bridge
->driver
->cache_flush();
435 curr
->is_flushed
= true;
438 ret_val
= curr
->bridge
->driver
->insert_memory(curr
, pg_start
, curr
->type
);
443 curr
->is_bound
= true;
444 curr
->pg_start
= pg_start
;
445 spin_lock(&agp_bridge
->mapped_lock
);
446 list_add(&curr
->mapped_list
, &agp_bridge
->mapped_list
);
447 spin_unlock(&agp_bridge
->mapped_lock
);
451 EXPORT_SYMBOL(agp_bind_memory
);
455 * agp_unbind_memory - Removes an agp_memory structure from the GATT
457 * @curr: agp_memory pointer to be removed from the GATT.
459 * It returns -EINVAL if this piece of agp_memory is not currently bound to
460 * the graphics aperture translation table or if the agp_memory pointer == NULL
462 int agp_unbind_memory(struct agp_memory
*curr
)
469 if (!curr
->is_bound
) {
470 printk(KERN_INFO PFX
"memory %p was not bound!\n", curr
);
474 ret_val
= curr
->bridge
->driver
->remove_memory(curr
, curr
->pg_start
, curr
->type
);
479 curr
->is_bound
= false;
481 spin_lock(&curr
->bridge
->mapped_lock
);
482 list_del(&curr
->mapped_list
);
483 spin_unlock(&curr
->bridge
->mapped_lock
);
486 EXPORT_SYMBOL(agp_unbind_memory
);
489 /* End - Routines for handling swapping of agp_memory into the GATT */
492 /* Generic Agp routines - Start */
493 static void agp_v2_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
497 if (*requested_mode
& AGP2_RESERVED_MASK
) {
498 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
499 *requested_mode
& AGP2_RESERVED_MASK
, *requested_mode
);
500 *requested_mode
&= ~AGP2_RESERVED_MASK
;
504 * Some dumb bridges are programmed to disobey the AGP2 spec.
505 * This is likely a BIOS misprogramming rather than poweron default, or
506 * it would be a lot more common.
507 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
508 * AGPv2 spec 6.1.9 states:
509 * The RATE field indicates the data transfer rates supported by this
510 * device. A.G.P. devices must report all that apply.
511 * Fix them up as best we can.
513 switch (*bridge_agpstat
& 7) {
515 *bridge_agpstat
|= (AGPSTAT2_2X
| AGPSTAT2_1X
);
516 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x4 rate. "
517 "Fixing up support for x2 & x1\n");
520 *bridge_agpstat
|= AGPSTAT2_1X
;
521 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x2 rate. "
522 "Fixing up support for x1\n");
528 /* Check the speed bits make sense. Only one should be set. */
529 tmp
= *requested_mode
& 7;
532 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to x1 mode.\n", current
->comm
);
533 *requested_mode
|= AGPSTAT2_1X
;
539 *requested_mode
&= ~(AGPSTAT2_1X
); /* rate=2 */
546 *requested_mode
&= ~(AGPSTAT2_1X
|AGPSTAT2_2X
); /* rate=4*/
550 /* disable SBA if it's not supported */
551 if (!((*bridge_agpstat
& AGPSTAT_SBA
) && (*vga_agpstat
& AGPSTAT_SBA
) && (*requested_mode
& AGPSTAT_SBA
)))
552 *bridge_agpstat
&= ~AGPSTAT_SBA
;
555 if (!((*bridge_agpstat
& AGPSTAT2_4X
) && (*vga_agpstat
& AGPSTAT2_4X
) && (*requested_mode
& AGPSTAT2_4X
)))
556 *bridge_agpstat
&= ~AGPSTAT2_4X
;
558 if (!((*bridge_agpstat
& AGPSTAT2_2X
) && (*vga_agpstat
& AGPSTAT2_2X
) && (*requested_mode
& AGPSTAT2_2X
)))
559 *bridge_agpstat
&= ~AGPSTAT2_2X
;
561 if (!((*bridge_agpstat
& AGPSTAT2_1X
) && (*vga_agpstat
& AGPSTAT2_1X
) && (*requested_mode
& AGPSTAT2_1X
)))
562 *bridge_agpstat
&= ~AGPSTAT2_1X
;
564 /* Now we know what mode it should be, clear out the unwanted bits. */
565 if (*bridge_agpstat
& AGPSTAT2_4X
)
566 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_2X
); /* 4X */
568 if (*bridge_agpstat
& AGPSTAT2_2X
)
569 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_4X
); /* 2X */
571 if (*bridge_agpstat
& AGPSTAT2_1X
)
572 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
); /* 1X */
574 /* Apply any errata. */
575 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
576 *bridge_agpstat
&= ~AGPSTAT_FW
;
578 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
579 *bridge_agpstat
&= ~AGPSTAT_SBA
;
581 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
582 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
583 *bridge_agpstat
|= AGPSTAT2_1X
;
586 /* If we've dropped down to 1X, disable fast writes. */
587 if (*bridge_agpstat
& AGPSTAT2_1X
)
588 *bridge_agpstat
&= ~AGPSTAT_FW
;
592 * requested_mode = Mode requested by (typically) X.
593 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
594 * vga_agpstat = PCI_AGP_STATUS from graphic card.
596 static void agp_v3_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
598 u32 origbridge
=*bridge_agpstat
, origvga
=*vga_agpstat
;
601 if (*requested_mode
& AGP3_RESERVED_MASK
) {
602 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
603 *requested_mode
& AGP3_RESERVED_MASK
, *requested_mode
);
604 *requested_mode
&= ~AGP3_RESERVED_MASK
;
607 /* Check the speed bits make sense. */
608 tmp
= *requested_mode
& 7;
610 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current
->comm
);
611 *requested_mode
|= AGPSTAT3_4X
;
614 printk(KERN_INFO PFX
"%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current
->comm
, tmp
* 4);
615 *requested_mode
= (*requested_mode
& ~7) | AGPSTAT3_8X
;
618 /* ARQSZ - Set the value to the maximum one.
619 * Don't allow the mode register to override values. */
620 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_ARQSZ
) |
621 max_t(u32
,(*bridge_agpstat
& AGPSTAT_ARQSZ
),(*vga_agpstat
& AGPSTAT_ARQSZ
)));
623 /* Calibration cycle.
624 * Don't allow the mode register to override values. */
625 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_CAL_MASK
) |
626 min_t(u32
,(*bridge_agpstat
& AGPSTAT_CAL_MASK
),(*vga_agpstat
& AGPSTAT_CAL_MASK
)));
628 /* SBA *must* be supported for AGP v3 */
629 *bridge_agpstat
|= AGPSTAT_SBA
;
633 * Check for invalid speeds. This can happen when applications
634 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
636 if (*requested_mode
& AGPSTAT_MODE_3_0
) {
638 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
639 * have been passed a 3.0 mode, but with 2.x speed bits set.
640 * AGP2.x 4x -> AGP3.0 4x.
642 if (*requested_mode
& AGPSTAT2_4X
) {
643 printk(KERN_INFO PFX
"%s passes broken AGP3 flags (%x). Fixed.\n",
644 current
->comm
, *requested_mode
);
645 *requested_mode
&= ~AGPSTAT2_4X
;
646 *requested_mode
|= AGPSTAT3_4X
;
650 * The caller doesn't know what they are doing. We are in 3.0 mode,
651 * but have been passed an AGP 2.x mode.
652 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
654 printk(KERN_INFO PFX
"%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
655 current
->comm
, *requested_mode
);
656 *requested_mode
&= ~(AGPSTAT2_4X
| AGPSTAT2_2X
| AGPSTAT2_1X
);
657 *requested_mode
|= AGPSTAT3_4X
;
660 if (*requested_mode
& AGPSTAT3_8X
) {
661 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
662 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
663 *bridge_agpstat
|= AGPSTAT3_4X
;
664 printk(KERN_INFO PFX
"%s requested AGPx8 but bridge not capable.\n", current
->comm
);
667 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
668 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
669 *bridge_agpstat
|= AGPSTAT3_4X
;
670 printk(KERN_INFO PFX
"%s requested AGPx8 but graphic card not capable.\n", current
->comm
);
673 /* All set, bridge & device can do AGP x8*/
674 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
677 } else if (*requested_mode
& AGPSTAT3_4X
) {
678 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
679 *bridge_agpstat
|= AGPSTAT3_4X
;
685 * If we didn't specify an AGP mode, we see if both
686 * the graphics card, and the bridge can do x8, and use if so.
687 * If not, we fall back to x4 mode.
689 if ((*bridge_agpstat
& AGPSTAT3_8X
) && (*vga_agpstat
& AGPSTAT3_8X
)) {
690 printk(KERN_INFO PFX
"No AGP mode specified. Setting to highest mode "
691 "supported by bridge & card (x8).\n");
692 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
693 *vga_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
695 printk(KERN_INFO PFX
"Fell back to AGPx4 mode because ");
696 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
697 printk(KERN_INFO PFX
"bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
698 *bridge_agpstat
, origbridge
);
699 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
700 *bridge_agpstat
|= AGPSTAT3_4X
;
702 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
703 printk(KERN_INFO PFX
"graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
704 *vga_agpstat
, origvga
);
705 *vga_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
706 *vga_agpstat
|= AGPSTAT3_4X
;
712 /* Apply any errata. */
713 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
714 *bridge_agpstat
&= ~AGPSTAT_FW
;
716 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
717 *bridge_agpstat
&= ~AGPSTAT_SBA
;
719 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
720 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
721 *bridge_agpstat
|= AGPSTAT2_1X
;
727 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
728 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
729 * @requested_mode: requested agp_stat from userspace (Typically from X)
730 * @bridge_agpstat: current agp_stat from AGP bridge.
732 * This function will hunt for an AGP graphics card, and try to match
733 * the requested mode to the capabilities of both the bridge and the card.
735 u32
agp_collect_device_status(struct agp_bridge_data
*bridge
, u32 requested_mode
, u32 bridge_agpstat
)
737 struct pci_dev
*device
= NULL
;
742 device
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, device
);
744 printk(KERN_INFO PFX
"Couldn't find an AGP VGA controller.\n");
747 cap_ptr
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
753 * Ok, here we have a AGP device. Disable impossible
754 * settings, and adjust the readqueue to the minimum.
756 pci_read_config_dword(device
, cap_ptr
+PCI_AGP_STATUS
, &vga_agpstat
);
758 /* adjust RQ depth */
759 bridge_agpstat
= ((bridge_agpstat
& ~AGPSTAT_RQ_DEPTH
) |
760 min_t(u32
, (requested_mode
& AGPSTAT_RQ_DEPTH
),
761 min_t(u32
, (bridge_agpstat
& AGPSTAT_RQ_DEPTH
), (vga_agpstat
& AGPSTAT_RQ_DEPTH
))));
763 /* disable FW if it's not supported */
764 if (!((bridge_agpstat
& AGPSTAT_FW
) &&
765 (vga_agpstat
& AGPSTAT_FW
) &&
766 (requested_mode
& AGPSTAT_FW
)))
767 bridge_agpstat
&= ~AGPSTAT_FW
;
769 /* Check to see if we are operating in 3.0 mode */
770 if (agp_bridge
->mode
& AGPSTAT_MODE_3_0
)
771 agp_v3_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
773 agp_v2_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
776 return bridge_agpstat
;
778 EXPORT_SYMBOL(agp_collect_device_status
);
781 void agp_device_command(u32 bridge_agpstat
, bool agp_v3
)
783 struct pci_dev
*device
= NULL
;
786 mode
= bridge_agpstat
& 0x7;
790 for_each_pci_dev(device
) {
791 u8 agp
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
795 dev_info(&device
->dev
, "putting AGP V%d device into %dx mode\n",
796 agp_v3
? 3 : 2, mode
);
797 pci_write_config_dword(device
, agp
+ PCI_AGP_COMMAND
, bridge_agpstat
);
800 EXPORT_SYMBOL(agp_device_command
);
803 void get_agp_version(struct agp_bridge_data
*bridge
)
807 /* Exit early if already set by errata workarounds. */
808 if (bridge
->major_version
!= 0)
811 pci_read_config_dword(bridge
->dev
, bridge
->capndx
, &ncapid
);
812 bridge
->major_version
= (ncapid
>> AGP_MAJOR_VERSION_SHIFT
) & 0xf;
813 bridge
->minor_version
= (ncapid
>> AGP_MINOR_VERSION_SHIFT
) & 0xf;
815 EXPORT_SYMBOL(get_agp_version
);
818 void agp_generic_enable(struct agp_bridge_data
*bridge
, u32 requested_mode
)
820 u32 bridge_agpstat
, temp
;
822 get_agp_version(agp_bridge
);
824 dev_info(&agp_bridge
->dev
->dev
, "AGP %d.%d bridge\n",
825 agp_bridge
->major_version
, agp_bridge
->minor_version
);
827 pci_read_config_dword(agp_bridge
->dev
,
828 agp_bridge
->capndx
+ PCI_AGP_STATUS
, &bridge_agpstat
);
830 bridge_agpstat
= agp_collect_device_status(agp_bridge
, requested_mode
, bridge_agpstat
);
831 if (bridge_agpstat
== 0)
832 /* Something bad happened. FIXME: Return error code? */
835 bridge_agpstat
|= AGPSTAT_AGP_ENABLE
;
837 /* Do AGP version specific frobbing. */
838 if (bridge
->major_version
>= 3) {
839 if (bridge
->mode
& AGPSTAT_MODE_3_0
) {
840 /* If we have 3.5, we can do the isoch stuff. */
841 if (bridge
->minor_version
>= 5)
842 agp_3_5_enable(bridge
);
843 agp_device_command(bridge_agpstat
, true);
846 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
847 bridge_agpstat
&= ~(7<<10) ;
848 pci_read_config_dword(bridge
->dev
,
849 bridge
->capndx
+AGPCTRL
, &temp
);
851 pci_write_config_dword(bridge
->dev
,
852 bridge
->capndx
+AGPCTRL
, temp
);
854 dev_info(&bridge
->dev
->dev
, "bridge is in legacy mode, falling back to 2.x\n");
859 agp_device_command(bridge_agpstat
, false);
861 EXPORT_SYMBOL(agp_generic_enable
);
864 int agp_generic_create_gatt_table(struct agp_bridge_data
*bridge
)
875 /* The generic routines can't handle 2 level gatt's */
876 if (bridge
->driver
->size_type
== LVL2_APER_SIZE
)
880 i
= bridge
->aperture_size_idx
;
881 temp
= bridge
->current_size
;
882 size
= page_order
= num_entries
= 0;
884 if (bridge
->driver
->size_type
!= FIXED_APER_SIZE
) {
886 switch (bridge
->driver
->size_type
) {
888 size
= A_SIZE_8(temp
)->size
;
890 A_SIZE_8(temp
)->page_order
;
892 A_SIZE_8(temp
)->num_entries
;
895 size
= A_SIZE_16(temp
)->size
;
896 page_order
= A_SIZE_16(temp
)->page_order
;
897 num_entries
= A_SIZE_16(temp
)->num_entries
;
900 size
= A_SIZE_32(temp
)->size
;
901 page_order
= A_SIZE_32(temp
)->page_order
;
902 num_entries
= A_SIZE_32(temp
)->num_entries
;
904 /* This case will never really happen. */
905 case FIXED_APER_SIZE
:
908 size
= page_order
= num_entries
= 0;
912 table
= alloc_gatt_pages(page_order
);
916 switch (bridge
->driver
->size_type
) {
918 bridge
->current_size
= A_IDX8(bridge
);
921 bridge
->current_size
= A_IDX16(bridge
);
924 bridge
->current_size
= A_IDX32(bridge
);
926 /* These cases will never really happen. */
927 case FIXED_APER_SIZE
:
932 temp
= bridge
->current_size
;
934 bridge
->aperture_size_idx
= i
;
936 } while (!table
&& (i
< bridge
->driver
->num_aperture_sizes
));
938 size
= ((struct aper_size_info_fixed
*) temp
)->size
;
939 page_order
= ((struct aper_size_info_fixed
*) temp
)->page_order
;
940 num_entries
= ((struct aper_size_info_fixed
*) temp
)->num_entries
;
941 table
= alloc_gatt_pages(page_order
);
947 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
949 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
950 SetPageReserved(page
);
952 bridge
->gatt_table_real
= (u32
*) table
;
953 agp_gatt_table
= (void *)table
;
955 bridge
->driver
->cache_flush();
957 if (set_memory_uc((unsigned long)table
, 1 << page_order
))
958 printk(KERN_WARNING
"Could not set GATT table memory to UC!\n");
960 bridge
->gatt_table
= (u32 __iomem
*)table
;
962 bridge
->gatt_table
= ioremap_nocache(virt_to_phys(table
),
963 (PAGE_SIZE
* (1 << page_order
)));
964 bridge
->driver
->cache_flush();
967 if (bridge
->gatt_table
== NULL
) {
968 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
969 ClearPageReserved(page
);
971 free_gatt_pages(table
, page_order
);
975 bridge
->gatt_bus_addr
= virt_to_phys(bridge
->gatt_table_real
);
977 /* AK: bogus, should encode addresses > 4GB */
978 for (i
= 0; i
< num_entries
; i
++) {
979 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
980 readl(bridge
->gatt_table
+i
); /* PCI Posting. */
985 EXPORT_SYMBOL(agp_generic_create_gatt_table
);
987 int agp_generic_free_gatt_table(struct agp_bridge_data
*bridge
)
990 char *table
, *table_end
;
994 temp
= bridge
->current_size
;
996 switch (bridge
->driver
->size_type
) {
998 page_order
= A_SIZE_8(temp
)->page_order
;
1001 page_order
= A_SIZE_16(temp
)->page_order
;
1004 page_order
= A_SIZE_32(temp
)->page_order
;
1006 case FIXED_APER_SIZE
:
1007 page_order
= A_SIZE_FIX(temp
)->page_order
;
1009 case LVL2_APER_SIZE
:
1010 /* The generic routines can't deal with 2 level gatt's */
1017 /* Do not worry about freeing memory, because if this is
1018 * called, then all agp memory is deallocated and removed
1019 * from the table. */
1022 set_memory_wb((unsigned long)bridge
->gatt_table
, 1 << page_order
);
1024 iounmap(bridge
->gatt_table
);
1026 table
= (char *) bridge
->gatt_table_real
;
1027 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
1029 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
1030 ClearPageReserved(page
);
1032 free_gatt_pages(bridge
->gatt_table_real
, page_order
);
1034 agp_gatt_table
= NULL
;
1035 bridge
->gatt_table
= NULL
;
1036 bridge
->gatt_table_real
= NULL
;
1037 bridge
->gatt_bus_addr
= 0;
1041 EXPORT_SYMBOL(agp_generic_free_gatt_table
);
1044 int agp_generic_insert_memory(struct agp_memory
* mem
, off_t pg_start
, int type
)
1050 struct agp_bridge_data
*bridge
;
1053 bridge
= mem
->bridge
;
1057 if (mem
->page_count
== 0)
1060 temp
= bridge
->current_size
;
1062 switch (bridge
->driver
->size_type
) {
1064 num_entries
= A_SIZE_8(temp
)->num_entries
;
1067 num_entries
= A_SIZE_16(temp
)->num_entries
;
1070 num_entries
= A_SIZE_32(temp
)->num_entries
;
1072 case FIXED_APER_SIZE
:
1073 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
1075 case LVL2_APER_SIZE
:
1076 /* The generic routines can't deal with 2 level gatt's */
1083 num_entries
-= agp_memory_reserved
/PAGE_SIZE
;
1084 if (num_entries
< 0) num_entries
= 0;
1086 if (type
!= mem
->type
)
1089 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1090 if (mask_type
!= 0) {
1091 /* The generic routines know nothing of memory types */
1095 if (((pg_start
+ mem
->page_count
) > num_entries
) ||
1096 ((pg_start
+ mem
->page_count
) < pg_start
))
1101 while (j
< (pg_start
+ mem
->page_count
)) {
1102 if (!PGE_EMPTY(bridge
, readl(bridge
->gatt_table
+j
)))
1107 if (!mem
->is_flushed
) {
1108 bridge
->driver
->cache_flush();
1109 mem
->is_flushed
= true;
1112 for (i
= 0, j
= pg_start
; i
< mem
->page_count
; i
++, j
++) {
1113 writel(bridge
->driver
->mask_memory(bridge
,
1114 page_to_phys(mem
->pages
[i
]),
1116 bridge
->gatt_table
+j
);
1118 readl(bridge
->gatt_table
+j
-1); /* PCI Posting. */
1120 bridge
->driver
->tlb_flush(mem
);
1123 EXPORT_SYMBOL(agp_generic_insert_memory
);
1126 int agp_generic_remove_memory(struct agp_memory
*mem
, off_t pg_start
, int type
)
1129 struct agp_bridge_data
*bridge
;
1130 int mask_type
, num_entries
;
1132 bridge
= mem
->bridge
;
1136 if (mem
->page_count
== 0)
1139 if (type
!= mem
->type
)
1142 num_entries
= agp_num_entries();
1143 if (((pg_start
+ mem
->page_count
) > num_entries
) ||
1144 ((pg_start
+ mem
->page_count
) < pg_start
))
1147 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1148 if (mask_type
!= 0) {
1149 /* The generic routines know nothing of memory types */
1153 /* AK: bogus, should encode addresses > 4GB */
1154 for (i
= pg_start
; i
< (mem
->page_count
+ pg_start
); i
++) {
1155 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
1157 readl(bridge
->gatt_table
+i
-1); /* PCI Posting. */
1159 bridge
->driver
->tlb_flush(mem
);
1162 EXPORT_SYMBOL(agp_generic_remove_memory
);
1164 struct agp_memory
*agp_generic_alloc_by_type(size_t page_count
, int type
)
1168 EXPORT_SYMBOL(agp_generic_alloc_by_type
);
1170 void agp_generic_free_by_type(struct agp_memory
*curr
)
1172 agp_free_page_array(curr
);
1173 agp_free_key(curr
->key
);
1176 EXPORT_SYMBOL(agp_generic_free_by_type
);
1178 struct agp_memory
*agp_generic_alloc_user(size_t page_count
, int type
)
1180 struct agp_memory
*new;
1184 pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
1185 new = agp_create_user_memory(page_count
);
1189 for (i
= 0; i
< page_count
; i
++)
1190 new->pages
[i
] = NULL
;
1191 new->page_count
= 0;
1193 new->num_scratch_pages
= pages
;
1197 EXPORT_SYMBOL(agp_generic_alloc_user
);
1200 * Basic Page Allocation Routines -
1201 * These routines handle page allocation and by default they reserve the allocated
1202 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1203 * against a maximum value.
1206 int agp_generic_alloc_pages(struct agp_bridge_data
*bridge
, struct agp_memory
*mem
, size_t num_pages
)
1209 int i
, ret
= -ENOMEM
;
1211 for (i
= 0; i
< num_pages
; i
++) {
1212 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
| __GFP_ZERO
);
1213 /* agp_free_memory() needs gart address */
1218 map_page_into_agp(page
);
1221 atomic_inc(&agp_bridge
->current_memory_agp
);
1223 mem
->pages
[i
] = page
;
1228 set_pages_array_uc(mem
->pages
, num_pages
);
1234 EXPORT_SYMBOL(agp_generic_alloc_pages
);
1236 struct page
*agp_generic_alloc_page(struct agp_bridge_data
*bridge
)
1240 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
| __GFP_ZERO
);
1244 map_page_into_agp(page
);
1247 atomic_inc(&agp_bridge
->current_memory_agp
);
1250 EXPORT_SYMBOL(agp_generic_alloc_page
);
1252 void agp_generic_destroy_pages(struct agp_memory
*mem
)
1261 set_pages_array_wb(mem
->pages
, mem
->page_count
);
1264 for (i
= 0; i
< mem
->page_count
; i
++) {
1265 page
= mem
->pages
[i
];
1268 unmap_page_from_agp(page
);
1272 atomic_dec(&agp_bridge
->current_memory_agp
);
1273 mem
->pages
[i
] = NULL
;
1276 EXPORT_SYMBOL(agp_generic_destroy_pages
);
1278 void agp_generic_destroy_page(struct page
*page
, int flags
)
1283 if (flags
& AGP_PAGE_DESTROY_UNMAP
)
1284 unmap_page_from_agp(page
);
1286 if (flags
& AGP_PAGE_DESTROY_FREE
) {
1289 atomic_dec(&agp_bridge
->current_memory_agp
);
1292 EXPORT_SYMBOL(agp_generic_destroy_page
);
1294 /* End Basic Page Allocation Routines */
1298 * agp_enable - initialise the agp point-to-point connection.
1300 * @mode: agp mode register value to configure with.
1302 void agp_enable(struct agp_bridge_data
*bridge
, u32 mode
)
1306 bridge
->driver
->agp_enable(bridge
, mode
);
1308 EXPORT_SYMBOL(agp_enable
);
1310 /* When we remove the global variable agp_bridge from all drivers
1311 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1314 struct agp_bridge_data
*agp_generic_find_bridge(struct pci_dev
*pdev
)
1316 if (list_empty(&agp_bridges
))
1322 static void ipi_handler(void *null
)
1327 void global_cache_flush(void)
1329 if (on_each_cpu(ipi_handler
, NULL
, 1) != 0)
1330 panic(PFX
"timed out waiting for the other CPUs!\n");
1332 EXPORT_SYMBOL(global_cache_flush
);
1334 unsigned long agp_generic_mask_memory(struct agp_bridge_data
*bridge
,
1335 dma_addr_t addr
, int type
)
1337 /* memory type is ignored in the generic routine */
1338 if (bridge
->driver
->masks
)
1339 return addr
| bridge
->driver
->masks
[0].mask
;
1343 EXPORT_SYMBOL(agp_generic_mask_memory
);
1345 int agp_generic_type_to_mask_type(struct agp_bridge_data
*bridge
,
1348 if (type
>= AGP_USER_TYPES
)
1352 EXPORT_SYMBOL(agp_generic_type_to_mask_type
);
1355 * These functions are implemented according to the AGPv3 spec,
1356 * which covers implementation details that had previously been
1360 int agp3_generic_fetch_size(void)
1364 struct aper_size_info_16
*values
;
1366 pci_read_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, &temp_size
);
1367 values
= A_SIZE_16(agp_bridge
->driver
->aperture_sizes
);
1369 for (i
= 0; i
< agp_bridge
->driver
->num_aperture_sizes
; i
++) {
1370 if (temp_size
== values
[i
].size_value
) {
1371 agp_bridge
->previous_size
=
1372 agp_bridge
->current_size
= (void *) (values
+ i
);
1374 agp_bridge
->aperture_size_idx
= i
;
1375 return values
[i
].size
;
1380 EXPORT_SYMBOL(agp3_generic_fetch_size
);
1382 void agp3_generic_tlbflush(struct agp_memory
*mem
)
1385 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1386 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_GTLBEN
);
1387 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
);
1389 EXPORT_SYMBOL(agp3_generic_tlbflush
);
1391 int agp3_generic_configure(void)
1394 struct aper_size_info_16
*current_size
;
1396 current_size
= A_SIZE_16(agp_bridge
->current_size
);
1398 agp_bridge
->gart_bus_addr
= pci_bus_address(agp_bridge
->dev
,
1401 /* set aperture size */
1402 pci_write_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, current_size
->size_value
);
1403 /* set gart pointer */
1404 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPGARTLO
, agp_bridge
->gatt_bus_addr
);
1405 /* enable aperture and GTLB */
1406 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &temp
);
1407 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, temp
| AGPCTRL_APERENB
| AGPCTRL_GTLBEN
);
1410 EXPORT_SYMBOL(agp3_generic_configure
);
1412 void agp3_generic_cleanup(void)
1415 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1416 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_APERENB
);
1418 EXPORT_SYMBOL(agp3_generic_cleanup
);
1420 const struct aper_size_info_16 agp3_generic_sizes
[AGP_GENERIC_SIZES_ENTRIES
] =
1422 {4096, 1048576, 10,0x000},
1423 {2048, 524288, 9, 0x800},
1424 {1024, 262144, 8, 0xc00},
1425 { 512, 131072, 7, 0xe00},
1426 { 256, 65536, 6, 0xf00},
1427 { 128, 32768, 5, 0xf20},
1428 { 64, 16384, 4, 0xf30},
1429 { 32, 8192, 3, 0xf38},
1430 { 16, 4096, 2, 0xf3c},
1431 { 8, 2048, 1, 0xf3e},
1432 { 4, 1024, 0, 0xf3f}
1434 EXPORT_SYMBOL(agp3_generic_sizes
);