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/init.h>
33 #include <linux/pagemap.h>
34 #include <linux/miscdevice.h>
36 #include <linux/agp_backend.h>
37 #include <linux/vmalloc.h>
38 #include <linux/dma-mapping.h>
40 #include <linux/sched.h>
41 #include <linux/slab.h>
43 #include <asm/cacheflush.h>
44 #include <asm/pgtable.h>
47 __u32
*agp_gatt_table
;
48 int agp_memory_reserved
;
51 * Needed by the Nforce GART driver for the time being. Would be
52 * nice to do this some other way instead of needing this export.
54 EXPORT_SYMBOL_GPL(agp_memory_reserved
);
57 * Generic routines for handling agp_memory structures -
58 * They use the basic page allocation routines to do the brunt of the work.
61 void agp_free_key(int key
)
67 clear_bit(key
, agp_bridge
->key_list
);
69 EXPORT_SYMBOL(agp_free_key
);
72 static int agp_get_key(void)
76 bit
= find_first_zero_bit(agp_bridge
->key_list
, MAXKEY
);
78 set_bit(bit
, agp_bridge
->key_list
);
85 * Use kmalloc if possible for the page list. Otherwise fall back to
86 * vmalloc. This speeds things up and also saves memory for small AGP
90 void agp_alloc_page_array(size_t size
, struct agp_memory
*mem
)
94 if (size
<= 2*PAGE_SIZE
)
95 mem
->pages
= kmalloc(size
, GFP_KERNEL
| __GFP_NOWARN
);
96 if (mem
->pages
== NULL
) {
97 mem
->pages
= vmalloc(size
);
100 EXPORT_SYMBOL(agp_alloc_page_array
);
102 void agp_free_page_array(struct agp_memory
*mem
)
104 if (is_vmalloc_addr(mem
->pages
)) {
110 EXPORT_SYMBOL(agp_free_page_array
);
113 static struct agp_memory
*agp_create_user_memory(unsigned long num_agp_pages
)
115 struct agp_memory
*new;
116 unsigned long alloc_size
= num_agp_pages
*sizeof(struct page
*);
118 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
122 new->key
= agp_get_key();
129 agp_alloc_page_array(alloc_size
, new);
131 if (new->pages
== NULL
) {
132 agp_free_key(new->key
);
136 new->num_scratch_pages
= 0;
140 struct agp_memory
*agp_create_memory(int scratch_pages
)
142 struct agp_memory
*new;
144 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
148 new->key
= agp_get_key();
155 agp_alloc_page_array(PAGE_SIZE
* scratch_pages
, new);
157 if (new->pages
== NULL
) {
158 agp_free_key(new->key
);
162 new->num_scratch_pages
= scratch_pages
;
163 new->type
= AGP_NORMAL_MEMORY
;
166 EXPORT_SYMBOL(agp_create_memory
);
169 * agp_free_memory - free memory associated with an agp_memory pointer.
171 * @curr: agp_memory pointer to be freed.
173 * It is the only function that can be called when the backend is not owned
174 * by the caller. (So it can free memory on client death.)
176 void agp_free_memory(struct agp_memory
*curr
)
184 agp_unbind_memory(curr
);
186 if (curr
->type
>= AGP_USER_TYPES
) {
187 agp_generic_free_by_type(curr
);
191 if (curr
->type
!= 0) {
192 curr
->bridge
->driver
->free_by_type(curr
);
195 if (curr
->page_count
!= 0) {
196 if (curr
->bridge
->driver
->agp_destroy_pages
) {
197 curr
->bridge
->driver
->agp_destroy_pages(curr
);
200 for (i
= 0; i
< curr
->page_count
; i
++) {
201 curr
->bridge
->driver
->agp_destroy_page(
203 AGP_PAGE_DESTROY_UNMAP
);
205 for (i
= 0; i
< curr
->page_count
; i
++) {
206 curr
->bridge
->driver
->agp_destroy_page(
208 AGP_PAGE_DESTROY_FREE
);
212 agp_free_key(curr
->key
);
213 agp_free_page_array(curr
);
216 EXPORT_SYMBOL(agp_free_memory
);
218 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
221 * agp_allocate_memory - allocate a group of pages of a certain type.
223 * @page_count: size_t argument of the number of pages
224 * @type: u32 argument of the type of memory to be allocated.
226 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
227 * maps to physical ram. Any other type is device dependent.
229 * It returns NULL whenever memory is unavailable.
231 struct agp_memory
*agp_allocate_memory(struct agp_bridge_data
*bridge
,
232 size_t page_count
, u32 type
)
235 struct agp_memory
*new;
241 if ((atomic_read(&bridge
->current_memory_agp
) + page_count
) > bridge
->max_memory_agp
)
244 if (type
>= AGP_USER_TYPES
) {
245 new = agp_generic_alloc_user(page_count
, type
);
247 new->bridge
= bridge
;
252 new = bridge
->driver
->alloc_by_type(page_count
, type
);
254 new->bridge
= bridge
;
258 scratch_pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
260 new = agp_create_memory(scratch_pages
);
265 if (bridge
->driver
->agp_alloc_pages
) {
266 if (bridge
->driver
->agp_alloc_pages(bridge
, new, page_count
)) {
267 agp_free_memory(new);
270 new->bridge
= bridge
;
274 for (i
= 0; i
< page_count
; i
++) {
275 struct page
*page
= bridge
->driver
->agp_alloc_page(bridge
);
278 agp_free_memory(new);
281 new->pages
[i
] = page
;
284 new->bridge
= bridge
;
288 EXPORT_SYMBOL(agp_allocate_memory
);
291 /* End - Generic routines for handling agp_memory structures */
294 static int agp_return_size(void)
299 temp
= agp_bridge
->current_size
;
301 switch (agp_bridge
->driver
->size_type
) {
303 current_size
= A_SIZE_8(temp
)->size
;
306 current_size
= A_SIZE_16(temp
)->size
;
309 current_size
= A_SIZE_32(temp
)->size
;
312 current_size
= A_SIZE_LVL2(temp
)->size
;
314 case FIXED_APER_SIZE
:
315 current_size
= A_SIZE_FIX(temp
)->size
;
322 current_size
-= (agp_memory_reserved
/ (1024*1024));
329 int agp_num_entries(void)
334 temp
= agp_bridge
->current_size
;
336 switch (agp_bridge
->driver
->size_type
) {
338 num_entries
= A_SIZE_8(temp
)->num_entries
;
341 num_entries
= A_SIZE_16(temp
)->num_entries
;
344 num_entries
= A_SIZE_32(temp
)->num_entries
;
347 num_entries
= A_SIZE_LVL2(temp
)->num_entries
;
349 case FIXED_APER_SIZE
:
350 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
357 num_entries
-= agp_memory_reserved
>>PAGE_SHIFT
;
362 EXPORT_SYMBOL_GPL(agp_num_entries
);
366 * agp_copy_info - copy bridge state information
368 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
370 * This function copies information about the agp bridge device and the state of
371 * the agp backend into an agp_kern_info pointer.
373 int agp_copy_info(struct agp_bridge_data
*bridge
, struct agp_kern_info
*info
)
375 memset(info
, 0, sizeof(struct agp_kern_info
));
377 info
->chipset
= NOT_SUPPORTED
;
381 info
->version
.major
= bridge
->version
->major
;
382 info
->version
.minor
= bridge
->version
->minor
;
383 info
->chipset
= SUPPORTED
;
384 info
->device
= bridge
->dev
;
385 if (bridge
->mode
& AGPSTAT_MODE_3_0
)
386 info
->mode
= bridge
->mode
& ~AGP3_RESERVED_MASK
;
388 info
->mode
= bridge
->mode
& ~AGP2_RESERVED_MASK
;
389 info
->aper_base
= bridge
->gart_bus_addr
;
390 info
->aper_size
= agp_return_size();
391 info
->max_memory
= bridge
->max_memory_agp
;
392 info
->current_memory
= atomic_read(&bridge
->current_memory_agp
);
393 info
->cant_use_aperture
= bridge
->driver
->cant_use_aperture
;
394 info
->vm_ops
= bridge
->vm_ops
;
395 info
->page_mask
= ~0UL;
398 EXPORT_SYMBOL(agp_copy_info
);
400 /* End - Routine to copy over information structure */
403 * Routines for handling swapping of agp_memory into the GATT -
404 * These routines take agp_memory and insert them into the GATT.
405 * They call device specific routines to actually write to the GATT.
409 * agp_bind_memory - Bind an agp_memory structure into the GATT.
411 * @curr: agp_memory pointer
412 * @pg_start: an offset into the graphics aperture translation table
414 * It returns -EINVAL if the pointer == NULL.
415 * It returns -EBUSY if the area of the table requested is already in use.
417 int agp_bind_memory(struct agp_memory
*curr
, off_t pg_start
)
424 if (curr
->is_bound
) {
425 printk(KERN_INFO PFX
"memory %p is already bound!\n", curr
);
428 if (!curr
->is_flushed
) {
429 curr
->bridge
->driver
->cache_flush();
430 curr
->is_flushed
= true;
433 ret_val
= curr
->bridge
->driver
->insert_memory(curr
, pg_start
, curr
->type
);
438 curr
->is_bound
= true;
439 curr
->pg_start
= pg_start
;
440 spin_lock(&agp_bridge
->mapped_lock
);
441 list_add(&curr
->mapped_list
, &agp_bridge
->mapped_list
);
442 spin_unlock(&agp_bridge
->mapped_lock
);
446 EXPORT_SYMBOL(agp_bind_memory
);
450 * agp_unbind_memory - Removes an agp_memory structure from the GATT
452 * @curr: agp_memory pointer to be removed from the GATT.
454 * It returns -EINVAL if this piece of agp_memory is not currently bound to
455 * the graphics aperture translation table or if the agp_memory pointer == NULL
457 int agp_unbind_memory(struct agp_memory
*curr
)
464 if (!curr
->is_bound
) {
465 printk(KERN_INFO PFX
"memory %p was not bound!\n", curr
);
469 ret_val
= curr
->bridge
->driver
->remove_memory(curr
, curr
->pg_start
, curr
->type
);
474 curr
->is_bound
= false;
476 spin_lock(&curr
->bridge
->mapped_lock
);
477 list_del(&curr
->mapped_list
);
478 spin_unlock(&curr
->bridge
->mapped_lock
);
481 EXPORT_SYMBOL(agp_unbind_memory
);
484 /* End - Routines for handling swapping of agp_memory into the GATT */
487 /* Generic Agp routines - Start */
488 static void agp_v2_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
492 if (*requested_mode
& AGP2_RESERVED_MASK
) {
493 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
494 *requested_mode
& AGP2_RESERVED_MASK
, *requested_mode
);
495 *requested_mode
&= ~AGP2_RESERVED_MASK
;
499 * Some dumb bridges are programmed to disobey the AGP2 spec.
500 * This is likely a BIOS misprogramming rather than poweron default, or
501 * it would be a lot more common.
502 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
503 * AGPv2 spec 6.1.9 states:
504 * The RATE field indicates the data transfer rates supported by this
505 * device. A.G.P. devices must report all that apply.
506 * Fix them up as best we can.
508 switch (*bridge_agpstat
& 7) {
510 *bridge_agpstat
|= (AGPSTAT2_2X
| AGPSTAT2_1X
);
511 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x4 rate"
512 "Fixing up support for x2 & x1\n");
515 *bridge_agpstat
|= AGPSTAT2_1X
;
516 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x2 rate"
517 "Fixing up support for x1\n");
523 /* Check the speed bits make sense. Only one should be set. */
524 tmp
= *requested_mode
& 7;
527 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to x1 mode.\n", current
->comm
);
528 *requested_mode
|= AGPSTAT2_1X
;
534 *requested_mode
&= ~(AGPSTAT2_1X
); /* rate=2 */
541 *requested_mode
&= ~(AGPSTAT2_1X
|AGPSTAT2_2X
); /* rate=4*/
545 /* disable SBA if it's not supported */
546 if (!((*bridge_agpstat
& AGPSTAT_SBA
) && (*vga_agpstat
& AGPSTAT_SBA
) && (*requested_mode
& AGPSTAT_SBA
)))
547 *bridge_agpstat
&= ~AGPSTAT_SBA
;
550 if (!((*bridge_agpstat
& AGPSTAT2_4X
) && (*vga_agpstat
& AGPSTAT2_4X
) && (*requested_mode
& AGPSTAT2_4X
)))
551 *bridge_agpstat
&= ~AGPSTAT2_4X
;
553 if (!((*bridge_agpstat
& AGPSTAT2_2X
) && (*vga_agpstat
& AGPSTAT2_2X
) && (*requested_mode
& AGPSTAT2_2X
)))
554 *bridge_agpstat
&= ~AGPSTAT2_2X
;
556 if (!((*bridge_agpstat
& AGPSTAT2_1X
) && (*vga_agpstat
& AGPSTAT2_1X
) && (*requested_mode
& AGPSTAT2_1X
)))
557 *bridge_agpstat
&= ~AGPSTAT2_1X
;
559 /* Now we know what mode it should be, clear out the unwanted bits. */
560 if (*bridge_agpstat
& AGPSTAT2_4X
)
561 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_2X
); /* 4X */
563 if (*bridge_agpstat
& AGPSTAT2_2X
)
564 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_4X
); /* 2X */
566 if (*bridge_agpstat
& AGPSTAT2_1X
)
567 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
); /* 1X */
569 /* Apply any errata. */
570 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
571 *bridge_agpstat
&= ~AGPSTAT_FW
;
573 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
574 *bridge_agpstat
&= ~AGPSTAT_SBA
;
576 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
577 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
578 *bridge_agpstat
|= AGPSTAT2_1X
;
581 /* If we've dropped down to 1X, disable fast writes. */
582 if (*bridge_agpstat
& AGPSTAT2_1X
)
583 *bridge_agpstat
&= ~AGPSTAT_FW
;
587 * requested_mode = Mode requested by (typically) X.
588 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
589 * vga_agpstat = PCI_AGP_STATUS from graphic card.
591 static void agp_v3_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
593 u32 origbridge
=*bridge_agpstat
, origvga
=*vga_agpstat
;
596 if (*requested_mode
& AGP3_RESERVED_MASK
) {
597 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
598 *requested_mode
& AGP3_RESERVED_MASK
, *requested_mode
);
599 *requested_mode
&= ~AGP3_RESERVED_MASK
;
602 /* Check the speed bits make sense. */
603 tmp
= *requested_mode
& 7;
605 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current
->comm
);
606 *requested_mode
|= AGPSTAT3_4X
;
609 printk(KERN_INFO PFX
"%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current
->comm
, tmp
* 4);
610 *requested_mode
= (*requested_mode
& ~7) | AGPSTAT3_8X
;
613 /* ARQSZ - Set the value to the maximum one.
614 * Don't allow the mode register to override values. */
615 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_ARQSZ
) |
616 max_t(u32
,(*bridge_agpstat
& AGPSTAT_ARQSZ
),(*vga_agpstat
& AGPSTAT_ARQSZ
)));
618 /* Calibration cycle.
619 * Don't allow the mode register to override values. */
620 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_CAL_MASK
) |
621 min_t(u32
,(*bridge_agpstat
& AGPSTAT_CAL_MASK
),(*vga_agpstat
& AGPSTAT_CAL_MASK
)));
623 /* SBA *must* be supported for AGP v3 */
624 *bridge_agpstat
|= AGPSTAT_SBA
;
628 * Check for invalid speeds. This can happen when applications
629 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
631 if (*requested_mode
& AGPSTAT_MODE_3_0
) {
633 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
634 * have been passed a 3.0 mode, but with 2.x speed bits set.
635 * AGP2.x 4x -> AGP3.0 4x.
637 if (*requested_mode
& AGPSTAT2_4X
) {
638 printk(KERN_INFO PFX
"%s passes broken AGP3 flags (%x). Fixed.\n",
639 current
->comm
, *requested_mode
);
640 *requested_mode
&= ~AGPSTAT2_4X
;
641 *requested_mode
|= AGPSTAT3_4X
;
645 * The caller doesn't know what they are doing. We are in 3.0 mode,
646 * but have been passed an AGP 2.x mode.
647 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
649 printk(KERN_INFO PFX
"%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
650 current
->comm
, *requested_mode
);
651 *requested_mode
&= ~(AGPSTAT2_4X
| AGPSTAT2_2X
| AGPSTAT2_1X
);
652 *requested_mode
|= AGPSTAT3_4X
;
655 if (*requested_mode
& AGPSTAT3_8X
) {
656 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
657 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
658 *bridge_agpstat
|= AGPSTAT3_4X
;
659 printk(KERN_INFO PFX
"%s requested AGPx8 but bridge not capable.\n", current
->comm
);
662 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
663 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
664 *bridge_agpstat
|= AGPSTAT3_4X
;
665 printk(KERN_INFO PFX
"%s requested AGPx8 but graphic card not capable.\n", current
->comm
);
668 /* All set, bridge & device can do AGP x8*/
669 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
672 } else if (*requested_mode
& AGPSTAT3_4X
) {
673 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
674 *bridge_agpstat
|= AGPSTAT3_4X
;
680 * If we didn't specify an AGP mode, we see if both
681 * the graphics card, and the bridge can do x8, and use if so.
682 * If not, we fall back to x4 mode.
684 if ((*bridge_agpstat
& AGPSTAT3_8X
) && (*vga_agpstat
& AGPSTAT3_8X
)) {
685 printk(KERN_INFO PFX
"No AGP mode specified. Setting to highest mode "
686 "supported by bridge & card (x8).\n");
687 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
688 *vga_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
690 printk(KERN_INFO PFX
"Fell back to AGPx4 mode because");
691 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
692 printk(KERN_INFO PFX
"bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
693 *bridge_agpstat
, origbridge
);
694 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
695 *bridge_agpstat
|= AGPSTAT3_4X
;
697 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
698 printk(KERN_INFO PFX
"graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
699 *vga_agpstat
, origvga
);
700 *vga_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
701 *vga_agpstat
|= AGPSTAT3_4X
;
707 /* Apply any errata. */
708 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
709 *bridge_agpstat
&= ~AGPSTAT_FW
;
711 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
712 *bridge_agpstat
&= ~AGPSTAT_SBA
;
714 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
715 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
716 *bridge_agpstat
|= AGPSTAT2_1X
;
722 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
723 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
724 * @requested_mode: requested agp_stat from userspace (Typically from X)
725 * @bridge_agpstat: current agp_stat from AGP bridge.
727 * This function will hunt for an AGP graphics card, and try to match
728 * the requested mode to the capabilities of both the bridge and the card.
730 u32
agp_collect_device_status(struct agp_bridge_data
*bridge
, u32 requested_mode
, u32 bridge_agpstat
)
732 struct pci_dev
*device
= NULL
;
737 device
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, device
);
739 printk(KERN_INFO PFX
"Couldn't find an AGP VGA controller.\n");
742 cap_ptr
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
748 * Ok, here we have a AGP device. Disable impossible
749 * settings, and adjust the readqueue to the minimum.
751 pci_read_config_dword(device
, cap_ptr
+PCI_AGP_STATUS
, &vga_agpstat
);
753 /* adjust RQ depth */
754 bridge_agpstat
= ((bridge_agpstat
& ~AGPSTAT_RQ_DEPTH
) |
755 min_t(u32
, (requested_mode
& AGPSTAT_RQ_DEPTH
),
756 min_t(u32
, (bridge_agpstat
& AGPSTAT_RQ_DEPTH
), (vga_agpstat
& AGPSTAT_RQ_DEPTH
))));
758 /* disable FW if it's not supported */
759 if (!((bridge_agpstat
& AGPSTAT_FW
) &&
760 (vga_agpstat
& AGPSTAT_FW
) &&
761 (requested_mode
& AGPSTAT_FW
)))
762 bridge_agpstat
&= ~AGPSTAT_FW
;
764 /* Check to see if we are operating in 3.0 mode */
765 if (agp_bridge
->mode
& AGPSTAT_MODE_3_0
)
766 agp_v3_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
768 agp_v2_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
771 return bridge_agpstat
;
773 EXPORT_SYMBOL(agp_collect_device_status
);
776 void agp_device_command(u32 bridge_agpstat
, bool agp_v3
)
778 struct pci_dev
*device
= NULL
;
781 mode
= bridge_agpstat
& 0x7;
785 for_each_pci_dev(device
) {
786 u8 agp
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
790 dev_info(&device
->dev
, "putting AGP V%d device into %dx mode\n",
791 agp_v3
? 3 : 2, mode
);
792 pci_write_config_dword(device
, agp
+ PCI_AGP_COMMAND
, bridge_agpstat
);
795 EXPORT_SYMBOL(agp_device_command
);
798 void get_agp_version(struct agp_bridge_data
*bridge
)
802 /* Exit early if already set by errata workarounds. */
803 if (bridge
->major_version
!= 0)
806 pci_read_config_dword(bridge
->dev
, bridge
->capndx
, &ncapid
);
807 bridge
->major_version
= (ncapid
>> AGP_MAJOR_VERSION_SHIFT
) & 0xf;
808 bridge
->minor_version
= (ncapid
>> AGP_MINOR_VERSION_SHIFT
) & 0xf;
810 EXPORT_SYMBOL(get_agp_version
);
813 void agp_generic_enable(struct agp_bridge_data
*bridge
, u32 requested_mode
)
815 u32 bridge_agpstat
, temp
;
817 get_agp_version(agp_bridge
);
819 dev_info(&agp_bridge
->dev
->dev
, "AGP %d.%d bridge\n",
820 agp_bridge
->major_version
, agp_bridge
->minor_version
);
822 pci_read_config_dword(agp_bridge
->dev
,
823 agp_bridge
->capndx
+ PCI_AGP_STATUS
, &bridge_agpstat
);
825 bridge_agpstat
= agp_collect_device_status(agp_bridge
, requested_mode
, bridge_agpstat
);
826 if (bridge_agpstat
== 0)
827 /* Something bad happened. FIXME: Return error code? */
830 bridge_agpstat
|= AGPSTAT_AGP_ENABLE
;
832 /* Do AGP version specific frobbing. */
833 if (bridge
->major_version
>= 3) {
834 if (bridge
->mode
& AGPSTAT_MODE_3_0
) {
835 /* If we have 3.5, we can do the isoch stuff. */
836 if (bridge
->minor_version
>= 5)
837 agp_3_5_enable(bridge
);
838 agp_device_command(bridge_agpstat
, true);
841 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
842 bridge_agpstat
&= ~(7<<10) ;
843 pci_read_config_dword(bridge
->dev
,
844 bridge
->capndx
+AGPCTRL
, &temp
);
846 pci_write_config_dword(bridge
->dev
,
847 bridge
->capndx
+AGPCTRL
, temp
);
849 dev_info(&bridge
->dev
->dev
, "bridge is in legacy mode, falling back to 2.x\n");
854 agp_device_command(bridge_agpstat
, false);
856 EXPORT_SYMBOL(agp_generic_enable
);
859 int agp_generic_create_gatt_table(struct agp_bridge_data
*bridge
)
870 /* The generic routines can't handle 2 level gatt's */
871 if (bridge
->driver
->size_type
== LVL2_APER_SIZE
)
875 i
= bridge
->aperture_size_idx
;
876 temp
= bridge
->current_size
;
877 size
= page_order
= num_entries
= 0;
879 if (bridge
->driver
->size_type
!= FIXED_APER_SIZE
) {
881 switch (bridge
->driver
->size_type
) {
883 size
= A_SIZE_8(temp
)->size
;
885 A_SIZE_8(temp
)->page_order
;
887 A_SIZE_8(temp
)->num_entries
;
890 size
= A_SIZE_16(temp
)->size
;
891 page_order
= A_SIZE_16(temp
)->page_order
;
892 num_entries
= A_SIZE_16(temp
)->num_entries
;
895 size
= A_SIZE_32(temp
)->size
;
896 page_order
= A_SIZE_32(temp
)->page_order
;
897 num_entries
= A_SIZE_32(temp
)->num_entries
;
899 /* This case will never really happen. */
900 case FIXED_APER_SIZE
:
903 size
= page_order
= num_entries
= 0;
907 table
= alloc_gatt_pages(page_order
);
911 switch (bridge
->driver
->size_type
) {
913 bridge
->current_size
= A_IDX8(bridge
);
916 bridge
->current_size
= A_IDX16(bridge
);
919 bridge
->current_size
= A_IDX32(bridge
);
921 /* These cases will never really happen. */
922 case FIXED_APER_SIZE
:
927 temp
= bridge
->current_size
;
929 bridge
->aperture_size_idx
= i
;
931 } while (!table
&& (i
< bridge
->driver
->num_aperture_sizes
));
933 size
= ((struct aper_size_info_fixed
*) temp
)->size
;
934 page_order
= ((struct aper_size_info_fixed
*) temp
)->page_order
;
935 num_entries
= ((struct aper_size_info_fixed
*) temp
)->num_entries
;
936 table
= alloc_gatt_pages(page_order
);
942 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
944 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
945 SetPageReserved(page
);
947 bridge
->gatt_table_real
= (u32
*) table
;
948 agp_gatt_table
= (void *)table
;
950 bridge
->driver
->cache_flush();
952 if (set_memory_uc((unsigned long)table
, 1 << page_order
))
953 printk(KERN_WARNING
"Could not set GATT table memory to UC!");
955 bridge
->gatt_table
= (void *)table
;
957 bridge
->gatt_table
= ioremap_nocache(virt_to_phys(table
),
958 (PAGE_SIZE
* (1 << page_order
)));
959 bridge
->driver
->cache_flush();
962 if (bridge
->gatt_table
== NULL
) {
963 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
964 ClearPageReserved(page
);
966 free_gatt_pages(table
, page_order
);
970 bridge
->gatt_bus_addr
= virt_to_phys(bridge
->gatt_table_real
);
972 /* AK: bogus, should encode addresses > 4GB */
973 for (i
= 0; i
< num_entries
; i
++) {
974 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
975 readl(bridge
->gatt_table
+i
); /* PCI Posting. */
980 EXPORT_SYMBOL(agp_generic_create_gatt_table
);
982 int agp_generic_free_gatt_table(struct agp_bridge_data
*bridge
)
985 char *table
, *table_end
;
989 temp
= bridge
->current_size
;
991 switch (bridge
->driver
->size_type
) {
993 page_order
= A_SIZE_8(temp
)->page_order
;
996 page_order
= A_SIZE_16(temp
)->page_order
;
999 page_order
= A_SIZE_32(temp
)->page_order
;
1001 case FIXED_APER_SIZE
:
1002 page_order
= A_SIZE_FIX(temp
)->page_order
;
1004 case LVL2_APER_SIZE
:
1005 /* The generic routines can't deal with 2 level gatt's */
1013 /* Do not worry about freeing memory, because if this is
1014 * called, then all agp memory is deallocated and removed
1015 * from the table. */
1018 set_memory_wb((unsigned long)bridge
->gatt_table
, 1 << page_order
);
1020 iounmap(bridge
->gatt_table
);
1022 table
= (char *) bridge
->gatt_table_real
;
1023 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
1025 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
1026 ClearPageReserved(page
);
1028 free_gatt_pages(bridge
->gatt_table_real
, page_order
);
1030 agp_gatt_table
= NULL
;
1031 bridge
->gatt_table
= NULL
;
1032 bridge
->gatt_table_real
= NULL
;
1033 bridge
->gatt_bus_addr
= 0;
1037 EXPORT_SYMBOL(agp_generic_free_gatt_table
);
1040 int agp_generic_insert_memory(struct agp_memory
* mem
, off_t pg_start
, int type
)
1046 struct agp_bridge_data
*bridge
;
1049 bridge
= mem
->bridge
;
1053 if (mem
->page_count
== 0)
1056 temp
= bridge
->current_size
;
1058 switch (bridge
->driver
->size_type
) {
1060 num_entries
= A_SIZE_8(temp
)->num_entries
;
1063 num_entries
= A_SIZE_16(temp
)->num_entries
;
1066 num_entries
= A_SIZE_32(temp
)->num_entries
;
1068 case FIXED_APER_SIZE
:
1069 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
1071 case LVL2_APER_SIZE
:
1072 /* The generic routines can't deal with 2 level gatt's */
1080 num_entries
-= agp_memory_reserved
/PAGE_SIZE
;
1081 if (num_entries
< 0) num_entries
= 0;
1083 if (type
!= mem
->type
)
1086 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1087 if (mask_type
!= 0) {
1088 /* The generic routines know nothing of memory types */
1092 /* AK: could wrap */
1093 if ((pg_start
+ mem
->page_count
) > num_entries
)
1098 while (j
< (pg_start
+ mem
->page_count
)) {
1099 if (!PGE_EMPTY(bridge
, readl(bridge
->gatt_table
+j
)))
1104 if (!mem
->is_flushed
) {
1105 bridge
->driver
->cache_flush();
1106 mem
->is_flushed
= true;
1109 for (i
= 0, j
= pg_start
; i
< mem
->page_count
; i
++, j
++) {
1110 writel(bridge
->driver
->mask_memory(bridge
,
1111 page_to_phys(mem
->pages
[i
]),
1113 bridge
->gatt_table
+j
);
1115 readl(bridge
->gatt_table
+j
-1); /* PCI Posting. */
1117 bridge
->driver
->tlb_flush(mem
);
1120 EXPORT_SYMBOL(agp_generic_insert_memory
);
1123 int agp_generic_remove_memory(struct agp_memory
*mem
, off_t pg_start
, int type
)
1126 struct agp_bridge_data
*bridge
;
1129 bridge
= mem
->bridge
;
1133 if (mem
->page_count
== 0)
1136 if (type
!= mem
->type
)
1139 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1140 if (mask_type
!= 0) {
1141 /* The generic routines know nothing of memory types */
1145 /* AK: bogus, should encode addresses > 4GB */
1146 for (i
= pg_start
; i
< (mem
->page_count
+ pg_start
); i
++) {
1147 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
1149 readl(bridge
->gatt_table
+i
-1); /* PCI Posting. */
1151 bridge
->driver
->tlb_flush(mem
);
1154 EXPORT_SYMBOL(agp_generic_remove_memory
);
1156 struct agp_memory
*agp_generic_alloc_by_type(size_t page_count
, int type
)
1160 EXPORT_SYMBOL(agp_generic_alloc_by_type
);
1162 void agp_generic_free_by_type(struct agp_memory
*curr
)
1164 agp_free_page_array(curr
);
1165 agp_free_key(curr
->key
);
1168 EXPORT_SYMBOL(agp_generic_free_by_type
);
1170 struct agp_memory
*agp_generic_alloc_user(size_t page_count
, int type
)
1172 struct agp_memory
*new;
1176 pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
1177 new = agp_create_user_memory(page_count
);
1181 for (i
= 0; i
< page_count
; i
++)
1182 new->pages
[i
] = NULL
;
1183 new->page_count
= 0;
1185 new->num_scratch_pages
= pages
;
1189 EXPORT_SYMBOL(agp_generic_alloc_user
);
1192 * Basic Page Allocation Routines -
1193 * These routines handle page allocation and by default they reserve the allocated
1194 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1195 * against a maximum value.
1198 int agp_generic_alloc_pages(struct agp_bridge_data
*bridge
, struct agp_memory
*mem
, size_t num_pages
)
1201 int i
, ret
= -ENOMEM
;
1203 for (i
= 0; i
< num_pages
; i
++) {
1204 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
| __GFP_ZERO
);
1205 /* agp_free_memory() needs gart address */
1210 map_page_into_agp(page
);
1213 atomic_inc(&agp_bridge
->current_memory_agp
);
1215 mem
->pages
[i
] = page
;
1220 set_pages_array_uc(mem
->pages
, num_pages
);
1226 EXPORT_SYMBOL(agp_generic_alloc_pages
);
1228 struct page
*agp_generic_alloc_page(struct agp_bridge_data
*bridge
)
1232 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
| __GFP_ZERO
);
1236 map_page_into_agp(page
);
1239 atomic_inc(&agp_bridge
->current_memory_agp
);
1242 EXPORT_SYMBOL(agp_generic_alloc_page
);
1244 void agp_generic_destroy_pages(struct agp_memory
*mem
)
1253 set_pages_array_wb(mem
->pages
, mem
->page_count
);
1256 for (i
= 0; i
< mem
->page_count
; i
++) {
1257 page
= mem
->pages
[i
];
1260 unmap_page_from_agp(page
);
1264 atomic_dec(&agp_bridge
->current_memory_agp
);
1265 mem
->pages
[i
] = NULL
;
1268 EXPORT_SYMBOL(agp_generic_destroy_pages
);
1270 void agp_generic_destroy_page(struct page
*page
, int flags
)
1275 if (flags
& AGP_PAGE_DESTROY_UNMAP
)
1276 unmap_page_from_agp(page
);
1278 if (flags
& AGP_PAGE_DESTROY_FREE
) {
1281 atomic_dec(&agp_bridge
->current_memory_agp
);
1284 EXPORT_SYMBOL(agp_generic_destroy_page
);
1286 /* End Basic Page Allocation Routines */
1290 * agp_enable - initialise the agp point-to-point connection.
1292 * @mode: agp mode register value to configure with.
1294 void agp_enable(struct agp_bridge_data
*bridge
, u32 mode
)
1298 bridge
->driver
->agp_enable(bridge
, mode
);
1300 EXPORT_SYMBOL(agp_enable
);
1302 /* When we remove the global variable agp_bridge from all drivers
1303 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1306 struct agp_bridge_data
*agp_generic_find_bridge(struct pci_dev
*pdev
)
1308 if (list_empty(&agp_bridges
))
1314 static void ipi_handler(void *null
)
1319 void global_cache_flush(void)
1321 if (on_each_cpu(ipi_handler
, NULL
, 1) != 0)
1322 panic(PFX
"timed out waiting for the other CPUs!\n");
1324 EXPORT_SYMBOL(global_cache_flush
);
1326 unsigned long agp_generic_mask_memory(struct agp_bridge_data
*bridge
,
1327 dma_addr_t addr
, int type
)
1329 /* memory type is ignored in the generic routine */
1330 if (bridge
->driver
->masks
)
1331 return addr
| bridge
->driver
->masks
[0].mask
;
1335 EXPORT_SYMBOL(agp_generic_mask_memory
);
1337 int agp_generic_type_to_mask_type(struct agp_bridge_data
*bridge
,
1340 if (type
>= AGP_USER_TYPES
)
1344 EXPORT_SYMBOL(agp_generic_type_to_mask_type
);
1347 * These functions are implemented according to the AGPv3 spec,
1348 * which covers implementation details that had previously been
1352 int agp3_generic_fetch_size(void)
1356 struct aper_size_info_16
*values
;
1358 pci_read_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, &temp_size
);
1359 values
= A_SIZE_16(agp_bridge
->driver
->aperture_sizes
);
1361 for (i
= 0; i
< agp_bridge
->driver
->num_aperture_sizes
; i
++) {
1362 if (temp_size
== values
[i
].size_value
) {
1363 agp_bridge
->previous_size
=
1364 agp_bridge
->current_size
= (void *) (values
+ i
);
1366 agp_bridge
->aperture_size_idx
= i
;
1367 return values
[i
].size
;
1372 EXPORT_SYMBOL(agp3_generic_fetch_size
);
1374 void agp3_generic_tlbflush(struct agp_memory
*mem
)
1377 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1378 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_GTLBEN
);
1379 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
);
1381 EXPORT_SYMBOL(agp3_generic_tlbflush
);
1383 int agp3_generic_configure(void)
1386 struct aper_size_info_16
*current_size
;
1388 current_size
= A_SIZE_16(agp_bridge
->current_size
);
1390 pci_read_config_dword(agp_bridge
->dev
, AGP_APBASE
, &temp
);
1391 agp_bridge
->gart_bus_addr
= (temp
& PCI_BASE_ADDRESS_MEM_MASK
);
1393 /* set aperture size */
1394 pci_write_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, current_size
->size_value
);
1395 /* set gart pointer */
1396 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPGARTLO
, agp_bridge
->gatt_bus_addr
);
1397 /* enable aperture and GTLB */
1398 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &temp
);
1399 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, temp
| AGPCTRL_APERENB
| AGPCTRL_GTLBEN
);
1402 EXPORT_SYMBOL(agp3_generic_configure
);
1404 void agp3_generic_cleanup(void)
1407 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1408 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_APERENB
);
1410 EXPORT_SYMBOL(agp3_generic_cleanup
);
1412 const struct aper_size_info_16 agp3_generic_sizes
[AGP_GENERIC_SIZES_ENTRIES
] =
1414 {4096, 1048576, 10,0x000},
1415 {2048, 524288, 9, 0x800},
1416 {1024, 262144, 8, 0xc00},
1417 { 512, 131072, 7, 0xe00},
1418 { 256, 65536, 6, 0xf00},
1419 { 128, 32768, 5, 0xf20},
1420 { 64, 16384, 4, 0xf30},
1421 { 32, 8192, 3, 0xf38},
1422 { 16, 4096, 2, 0xf3c},
1423 { 8, 2048, 1, 0xf3e},
1424 { 4, 1024, 0, 0xf3f}
1426 EXPORT_SYMBOL(agp3_generic_sizes
);