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
)
91 mem
->pages
= kvmalloc(size
, GFP_KERNEL
);
93 EXPORT_SYMBOL(agp_alloc_page_array
);
95 static struct agp_memory
*agp_create_user_memory(unsigned long num_agp_pages
)
97 struct agp_memory
*new;
98 unsigned long alloc_size
= num_agp_pages
*sizeof(struct page
*);
100 if (INT_MAX
/sizeof(struct page
*) < num_agp_pages
)
103 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
107 new->key
= agp_get_key();
114 agp_alloc_page_array(alloc_size
, new);
116 if (new->pages
== NULL
) {
117 agp_free_key(new->key
);
121 new->num_scratch_pages
= 0;
125 struct agp_memory
*agp_create_memory(int scratch_pages
)
127 struct agp_memory
*new;
129 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
133 new->key
= agp_get_key();
140 agp_alloc_page_array(PAGE_SIZE
* scratch_pages
, new);
142 if (new->pages
== NULL
) {
143 agp_free_key(new->key
);
147 new->num_scratch_pages
= scratch_pages
;
148 new->type
= AGP_NORMAL_MEMORY
;
151 EXPORT_SYMBOL(agp_create_memory
);
154 * agp_free_memory - free memory associated with an agp_memory pointer.
156 * @curr: agp_memory pointer to be freed.
158 * It is the only function that can be called when the backend is not owned
159 * by the caller. (So it can free memory on client death.)
161 void agp_free_memory(struct agp_memory
*curr
)
169 agp_unbind_memory(curr
);
171 if (curr
->type
>= AGP_USER_TYPES
) {
172 agp_generic_free_by_type(curr
);
176 if (curr
->type
!= 0) {
177 curr
->bridge
->driver
->free_by_type(curr
);
180 if (curr
->page_count
!= 0) {
181 if (curr
->bridge
->driver
->agp_destroy_pages
) {
182 curr
->bridge
->driver
->agp_destroy_pages(curr
);
185 for (i
= 0; i
< curr
->page_count
; i
++) {
186 curr
->bridge
->driver
->agp_destroy_page(
188 AGP_PAGE_DESTROY_UNMAP
);
190 for (i
= 0; i
< curr
->page_count
; i
++) {
191 curr
->bridge
->driver
->agp_destroy_page(
193 AGP_PAGE_DESTROY_FREE
);
197 agp_free_key(curr
->key
);
198 agp_free_page_array(curr
);
201 EXPORT_SYMBOL(agp_free_memory
);
203 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
206 * agp_allocate_memory - allocate a group of pages of a certain type.
208 * @page_count: size_t argument of the number of pages
209 * @type: u32 argument of the type of memory to be allocated.
211 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
212 * maps to physical ram. Any other type is device dependent.
214 * It returns NULL whenever memory is unavailable.
216 struct agp_memory
*agp_allocate_memory(struct agp_bridge_data
*bridge
,
217 size_t page_count
, u32 type
)
220 struct agp_memory
*new;
227 cur_memory
= atomic_read(&bridge
->current_memory_agp
);
228 if ((cur_memory
+ page_count
> bridge
->max_memory_agp
) ||
229 (cur_memory
+ page_count
< page_count
))
232 if (type
>= AGP_USER_TYPES
) {
233 new = agp_generic_alloc_user(page_count
, type
);
235 new->bridge
= bridge
;
240 new = bridge
->driver
->alloc_by_type(page_count
, type
);
242 new->bridge
= bridge
;
246 scratch_pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
248 new = agp_create_memory(scratch_pages
);
253 if (bridge
->driver
->agp_alloc_pages
) {
254 if (bridge
->driver
->agp_alloc_pages(bridge
, new, page_count
)) {
255 agp_free_memory(new);
258 new->bridge
= bridge
;
262 for (i
= 0; i
< page_count
; i
++) {
263 struct page
*page
= bridge
->driver
->agp_alloc_page(bridge
);
266 agp_free_memory(new);
269 new->pages
[i
] = page
;
272 new->bridge
= bridge
;
276 EXPORT_SYMBOL(agp_allocate_memory
);
279 /* End - Generic routines for handling agp_memory structures */
282 static int agp_return_size(void)
287 temp
= agp_bridge
->current_size
;
289 switch (agp_bridge
->driver
->size_type
) {
291 current_size
= A_SIZE_8(temp
)->size
;
294 current_size
= A_SIZE_16(temp
)->size
;
297 current_size
= A_SIZE_32(temp
)->size
;
300 current_size
= A_SIZE_LVL2(temp
)->size
;
302 case FIXED_APER_SIZE
:
303 current_size
= A_SIZE_FIX(temp
)->size
;
310 current_size
-= (agp_memory_reserved
/ (1024*1024));
317 int agp_num_entries(void)
322 temp
= agp_bridge
->current_size
;
324 switch (agp_bridge
->driver
->size_type
) {
326 num_entries
= A_SIZE_8(temp
)->num_entries
;
329 num_entries
= A_SIZE_16(temp
)->num_entries
;
332 num_entries
= A_SIZE_32(temp
)->num_entries
;
335 num_entries
= A_SIZE_LVL2(temp
)->num_entries
;
337 case FIXED_APER_SIZE
:
338 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
345 num_entries
-= agp_memory_reserved
>>PAGE_SHIFT
;
350 EXPORT_SYMBOL_GPL(agp_num_entries
);
354 * agp_copy_info - copy bridge state information
356 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
358 * This function copies information about the agp bridge device and the state of
359 * the agp backend into an agp_kern_info pointer.
361 int agp_copy_info(struct agp_bridge_data
*bridge
, struct agp_kern_info
*info
)
363 memset(info
, 0, sizeof(struct agp_kern_info
));
365 info
->chipset
= NOT_SUPPORTED
;
369 info
->version
.major
= bridge
->version
->major
;
370 info
->version
.minor
= bridge
->version
->minor
;
371 info
->chipset
= SUPPORTED
;
372 info
->device
= bridge
->dev
;
373 if (bridge
->mode
& AGPSTAT_MODE_3_0
)
374 info
->mode
= bridge
->mode
& ~AGP3_RESERVED_MASK
;
376 info
->mode
= bridge
->mode
& ~AGP2_RESERVED_MASK
;
377 info
->aper_base
= bridge
->gart_bus_addr
;
378 info
->aper_size
= agp_return_size();
379 info
->max_memory
= bridge
->max_memory_agp
;
380 info
->current_memory
= atomic_read(&bridge
->current_memory_agp
);
381 info
->cant_use_aperture
= bridge
->driver
->cant_use_aperture
;
382 info
->vm_ops
= bridge
->vm_ops
;
383 info
->page_mask
= ~0UL;
386 EXPORT_SYMBOL(agp_copy_info
);
388 /* End - Routine to copy over information structure */
391 * Routines for handling swapping of agp_memory into the GATT -
392 * These routines take agp_memory and insert them into the GATT.
393 * They call device specific routines to actually write to the GATT.
397 * agp_bind_memory - Bind an agp_memory structure into the GATT.
399 * @curr: agp_memory pointer
400 * @pg_start: an offset into the graphics aperture translation table
402 * It returns -EINVAL if the pointer == NULL.
403 * It returns -EBUSY if the area of the table requested is already in use.
405 int agp_bind_memory(struct agp_memory
*curr
, off_t pg_start
)
412 if (curr
->is_bound
) {
413 printk(KERN_INFO PFX
"memory %p is already bound!\n", curr
);
416 if (!curr
->is_flushed
) {
417 curr
->bridge
->driver
->cache_flush();
418 curr
->is_flushed
= true;
421 ret_val
= curr
->bridge
->driver
->insert_memory(curr
, pg_start
, curr
->type
);
426 curr
->is_bound
= true;
427 curr
->pg_start
= pg_start
;
428 spin_lock(&agp_bridge
->mapped_lock
);
429 list_add(&curr
->mapped_list
, &agp_bridge
->mapped_list
);
430 spin_unlock(&agp_bridge
->mapped_lock
);
434 EXPORT_SYMBOL(agp_bind_memory
);
438 * agp_unbind_memory - Removes an agp_memory structure from the GATT
440 * @curr: agp_memory pointer to be removed from the GATT.
442 * It returns -EINVAL if this piece of agp_memory is not currently bound to
443 * the graphics aperture translation table or if the agp_memory pointer == NULL
445 int agp_unbind_memory(struct agp_memory
*curr
)
452 if (!curr
->is_bound
) {
453 printk(KERN_INFO PFX
"memory %p was not bound!\n", curr
);
457 ret_val
= curr
->bridge
->driver
->remove_memory(curr
, curr
->pg_start
, curr
->type
);
462 curr
->is_bound
= false;
464 spin_lock(&curr
->bridge
->mapped_lock
);
465 list_del(&curr
->mapped_list
);
466 spin_unlock(&curr
->bridge
->mapped_lock
);
469 EXPORT_SYMBOL(agp_unbind_memory
);
472 /* End - Routines for handling swapping of agp_memory into the GATT */
475 /* Generic Agp routines - Start */
476 static void agp_v2_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
480 if (*requested_mode
& AGP2_RESERVED_MASK
) {
481 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
482 *requested_mode
& AGP2_RESERVED_MASK
, *requested_mode
);
483 *requested_mode
&= ~AGP2_RESERVED_MASK
;
487 * Some dumb bridges are programmed to disobey the AGP2 spec.
488 * This is likely a BIOS misprogramming rather than poweron default, or
489 * it would be a lot more common.
490 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
491 * AGPv2 spec 6.1.9 states:
492 * The RATE field indicates the data transfer rates supported by this
493 * device. A.G.P. devices must report all that apply.
494 * Fix them up as best we can.
496 switch (*bridge_agpstat
& 7) {
498 *bridge_agpstat
|= (AGPSTAT2_2X
| AGPSTAT2_1X
);
499 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x4 rate. "
500 "Fixing up support for x2 & x1\n");
503 *bridge_agpstat
|= AGPSTAT2_1X
;
504 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x2 rate. "
505 "Fixing up support for x1\n");
511 /* Check the speed bits make sense. Only one should be set. */
512 tmp
= *requested_mode
& 7;
515 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to x1 mode.\n", current
->comm
);
516 *requested_mode
|= AGPSTAT2_1X
;
522 *requested_mode
&= ~(AGPSTAT2_1X
); /* rate=2 */
529 *requested_mode
&= ~(AGPSTAT2_1X
|AGPSTAT2_2X
); /* rate=4*/
533 /* disable SBA if it's not supported */
534 if (!((*bridge_agpstat
& AGPSTAT_SBA
) && (*vga_agpstat
& AGPSTAT_SBA
) && (*requested_mode
& AGPSTAT_SBA
)))
535 *bridge_agpstat
&= ~AGPSTAT_SBA
;
538 if (!((*bridge_agpstat
& AGPSTAT2_4X
) && (*vga_agpstat
& AGPSTAT2_4X
) && (*requested_mode
& AGPSTAT2_4X
)))
539 *bridge_agpstat
&= ~AGPSTAT2_4X
;
541 if (!((*bridge_agpstat
& AGPSTAT2_2X
) && (*vga_agpstat
& AGPSTAT2_2X
) && (*requested_mode
& AGPSTAT2_2X
)))
542 *bridge_agpstat
&= ~AGPSTAT2_2X
;
544 if (!((*bridge_agpstat
& AGPSTAT2_1X
) && (*vga_agpstat
& AGPSTAT2_1X
) && (*requested_mode
& AGPSTAT2_1X
)))
545 *bridge_agpstat
&= ~AGPSTAT2_1X
;
547 /* Now we know what mode it should be, clear out the unwanted bits. */
548 if (*bridge_agpstat
& AGPSTAT2_4X
)
549 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_2X
); /* 4X */
551 if (*bridge_agpstat
& AGPSTAT2_2X
)
552 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_4X
); /* 2X */
554 if (*bridge_agpstat
& AGPSTAT2_1X
)
555 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
); /* 1X */
557 /* Apply any errata. */
558 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
559 *bridge_agpstat
&= ~AGPSTAT_FW
;
561 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
562 *bridge_agpstat
&= ~AGPSTAT_SBA
;
564 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
565 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
566 *bridge_agpstat
|= AGPSTAT2_1X
;
569 /* If we've dropped down to 1X, disable fast writes. */
570 if (*bridge_agpstat
& AGPSTAT2_1X
)
571 *bridge_agpstat
&= ~AGPSTAT_FW
;
575 * requested_mode = Mode requested by (typically) X.
576 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
577 * vga_agpstat = PCI_AGP_STATUS from graphic card.
579 static void agp_v3_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
581 u32 origbridge
=*bridge_agpstat
, origvga
=*vga_agpstat
;
584 if (*requested_mode
& AGP3_RESERVED_MASK
) {
585 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
586 *requested_mode
& AGP3_RESERVED_MASK
, *requested_mode
);
587 *requested_mode
&= ~AGP3_RESERVED_MASK
;
590 /* Check the speed bits make sense. */
591 tmp
= *requested_mode
& 7;
593 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current
->comm
);
594 *requested_mode
|= AGPSTAT3_4X
;
597 printk(KERN_INFO PFX
"%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current
->comm
, tmp
* 4);
598 *requested_mode
= (*requested_mode
& ~7) | AGPSTAT3_8X
;
601 /* ARQSZ - Set the value to the maximum one.
602 * Don't allow the mode register to override values. */
603 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_ARQSZ
) |
604 max_t(u32
,(*bridge_agpstat
& AGPSTAT_ARQSZ
),(*vga_agpstat
& AGPSTAT_ARQSZ
)));
606 /* Calibration cycle.
607 * Don't allow the mode register to override values. */
608 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_CAL_MASK
) |
609 min_t(u32
,(*bridge_agpstat
& AGPSTAT_CAL_MASK
),(*vga_agpstat
& AGPSTAT_CAL_MASK
)));
611 /* SBA *must* be supported for AGP v3 */
612 *bridge_agpstat
|= AGPSTAT_SBA
;
616 * Check for invalid speeds. This can happen when applications
617 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
619 if (*requested_mode
& AGPSTAT_MODE_3_0
) {
621 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
622 * have been passed a 3.0 mode, but with 2.x speed bits set.
623 * AGP2.x 4x -> AGP3.0 4x.
625 if (*requested_mode
& AGPSTAT2_4X
) {
626 printk(KERN_INFO PFX
"%s passes broken AGP3 flags (%x). Fixed.\n",
627 current
->comm
, *requested_mode
);
628 *requested_mode
&= ~AGPSTAT2_4X
;
629 *requested_mode
|= AGPSTAT3_4X
;
633 * The caller doesn't know what they are doing. We are in 3.0 mode,
634 * but have been passed an AGP 2.x mode.
635 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
637 printk(KERN_INFO PFX
"%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
638 current
->comm
, *requested_mode
);
639 *requested_mode
&= ~(AGPSTAT2_4X
| AGPSTAT2_2X
| AGPSTAT2_1X
);
640 *requested_mode
|= AGPSTAT3_4X
;
643 if (*requested_mode
& AGPSTAT3_8X
) {
644 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
645 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
646 *bridge_agpstat
|= AGPSTAT3_4X
;
647 printk(KERN_INFO PFX
"%s requested AGPx8 but bridge not capable.\n", current
->comm
);
650 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
651 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
652 *bridge_agpstat
|= AGPSTAT3_4X
;
653 printk(KERN_INFO PFX
"%s requested AGPx8 but graphic card not capable.\n", current
->comm
);
656 /* All set, bridge & device can do AGP x8*/
657 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
660 } else if (*requested_mode
& AGPSTAT3_4X
) {
661 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
662 *bridge_agpstat
|= AGPSTAT3_4X
;
668 * If we didn't specify an AGP mode, we see if both
669 * the graphics card, and the bridge can do x8, and use if so.
670 * If not, we fall back to x4 mode.
672 if ((*bridge_agpstat
& AGPSTAT3_8X
) && (*vga_agpstat
& AGPSTAT3_8X
)) {
673 printk(KERN_INFO PFX
"No AGP mode specified. Setting to highest mode "
674 "supported by bridge & card (x8).\n");
675 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
676 *vga_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
678 printk(KERN_INFO PFX
"Fell back to AGPx4 mode because ");
679 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
680 printk(KERN_INFO PFX
"bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
681 *bridge_agpstat
, origbridge
);
682 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
683 *bridge_agpstat
|= AGPSTAT3_4X
;
685 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
686 printk(KERN_INFO PFX
"graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
687 *vga_agpstat
, origvga
);
688 *vga_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
689 *vga_agpstat
|= AGPSTAT3_4X
;
695 /* Apply any errata. */
696 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
697 *bridge_agpstat
&= ~AGPSTAT_FW
;
699 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
700 *bridge_agpstat
&= ~AGPSTAT_SBA
;
702 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
703 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
704 *bridge_agpstat
|= AGPSTAT2_1X
;
710 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
711 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
712 * @requested_mode: requested agp_stat from userspace (Typically from X)
713 * @bridge_agpstat: current agp_stat from AGP bridge.
715 * This function will hunt for an AGP graphics card, and try to match
716 * the requested mode to the capabilities of both the bridge and the card.
718 u32
agp_collect_device_status(struct agp_bridge_data
*bridge
, u32 requested_mode
, u32 bridge_agpstat
)
720 struct pci_dev
*device
= NULL
;
725 device
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, device
);
727 printk(KERN_INFO PFX
"Couldn't find an AGP VGA controller.\n");
730 cap_ptr
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
736 * Ok, here we have a AGP device. Disable impossible
737 * settings, and adjust the readqueue to the minimum.
739 pci_read_config_dword(device
, cap_ptr
+PCI_AGP_STATUS
, &vga_agpstat
);
741 /* adjust RQ depth */
742 bridge_agpstat
= ((bridge_agpstat
& ~AGPSTAT_RQ_DEPTH
) |
743 min_t(u32
, (requested_mode
& AGPSTAT_RQ_DEPTH
),
744 min_t(u32
, (bridge_agpstat
& AGPSTAT_RQ_DEPTH
), (vga_agpstat
& AGPSTAT_RQ_DEPTH
))));
746 /* disable FW if it's not supported */
747 if (!((bridge_agpstat
& AGPSTAT_FW
) &&
748 (vga_agpstat
& AGPSTAT_FW
) &&
749 (requested_mode
& AGPSTAT_FW
)))
750 bridge_agpstat
&= ~AGPSTAT_FW
;
752 /* Check to see if we are operating in 3.0 mode */
753 if (agp_bridge
->mode
& AGPSTAT_MODE_3_0
)
754 agp_v3_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
756 agp_v2_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
759 return bridge_agpstat
;
761 EXPORT_SYMBOL(agp_collect_device_status
);
764 void agp_device_command(u32 bridge_agpstat
, bool agp_v3
)
766 struct pci_dev
*device
= NULL
;
769 mode
= bridge_agpstat
& 0x7;
773 for_each_pci_dev(device
) {
774 u8 agp
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
778 dev_info(&device
->dev
, "putting AGP V%d device into %dx mode\n",
779 agp_v3
? 3 : 2, mode
);
780 pci_write_config_dword(device
, agp
+ PCI_AGP_COMMAND
, bridge_agpstat
);
783 EXPORT_SYMBOL(agp_device_command
);
786 void get_agp_version(struct agp_bridge_data
*bridge
)
790 /* Exit early if already set by errata workarounds. */
791 if (bridge
->major_version
!= 0)
794 pci_read_config_dword(bridge
->dev
, bridge
->capndx
, &ncapid
);
795 bridge
->major_version
= (ncapid
>> AGP_MAJOR_VERSION_SHIFT
) & 0xf;
796 bridge
->minor_version
= (ncapid
>> AGP_MINOR_VERSION_SHIFT
) & 0xf;
798 EXPORT_SYMBOL(get_agp_version
);
801 void agp_generic_enable(struct agp_bridge_data
*bridge
, u32 requested_mode
)
803 u32 bridge_agpstat
, temp
;
805 get_agp_version(agp_bridge
);
807 dev_info(&agp_bridge
->dev
->dev
, "AGP %d.%d bridge\n",
808 agp_bridge
->major_version
, agp_bridge
->minor_version
);
810 pci_read_config_dword(agp_bridge
->dev
,
811 agp_bridge
->capndx
+ PCI_AGP_STATUS
, &bridge_agpstat
);
813 bridge_agpstat
= agp_collect_device_status(agp_bridge
, requested_mode
, bridge_agpstat
);
814 if (bridge_agpstat
== 0)
815 /* Something bad happened. FIXME: Return error code? */
818 bridge_agpstat
|= AGPSTAT_AGP_ENABLE
;
820 /* Do AGP version specific frobbing. */
821 if (bridge
->major_version
>= 3) {
822 if (bridge
->mode
& AGPSTAT_MODE_3_0
) {
823 /* If we have 3.5, we can do the isoch stuff. */
824 if (bridge
->minor_version
>= 5)
825 agp_3_5_enable(bridge
);
826 agp_device_command(bridge_agpstat
, true);
829 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
830 bridge_agpstat
&= ~(7<<10) ;
831 pci_read_config_dword(bridge
->dev
,
832 bridge
->capndx
+AGPCTRL
, &temp
);
834 pci_write_config_dword(bridge
->dev
,
835 bridge
->capndx
+AGPCTRL
, temp
);
837 dev_info(&bridge
->dev
->dev
, "bridge is in legacy mode, falling back to 2.x\n");
842 agp_device_command(bridge_agpstat
, false);
844 EXPORT_SYMBOL(agp_generic_enable
);
847 int agp_generic_create_gatt_table(struct agp_bridge_data
*bridge
)
858 /* The generic routines can't handle 2 level gatt's */
859 if (bridge
->driver
->size_type
== LVL2_APER_SIZE
)
863 i
= bridge
->aperture_size_idx
;
864 temp
= bridge
->current_size
;
865 size
= page_order
= num_entries
= 0;
867 if (bridge
->driver
->size_type
!= FIXED_APER_SIZE
) {
869 switch (bridge
->driver
->size_type
) {
871 size
= A_SIZE_8(temp
)->size
;
873 A_SIZE_8(temp
)->page_order
;
875 A_SIZE_8(temp
)->num_entries
;
878 size
= A_SIZE_16(temp
)->size
;
879 page_order
= A_SIZE_16(temp
)->page_order
;
880 num_entries
= A_SIZE_16(temp
)->num_entries
;
883 size
= A_SIZE_32(temp
)->size
;
884 page_order
= A_SIZE_32(temp
)->page_order
;
885 num_entries
= A_SIZE_32(temp
)->num_entries
;
887 /* This case will never really happen. */
888 case FIXED_APER_SIZE
:
891 size
= page_order
= num_entries
= 0;
895 table
= alloc_gatt_pages(page_order
);
899 switch (bridge
->driver
->size_type
) {
901 bridge
->current_size
= A_IDX8(bridge
);
904 bridge
->current_size
= A_IDX16(bridge
);
907 bridge
->current_size
= A_IDX32(bridge
);
909 /* These cases will never really happen. */
910 case FIXED_APER_SIZE
:
915 temp
= bridge
->current_size
;
917 bridge
->aperture_size_idx
= i
;
919 } while (!table
&& (i
< bridge
->driver
->num_aperture_sizes
));
921 size
= ((struct aper_size_info_fixed
*) temp
)->size
;
922 page_order
= ((struct aper_size_info_fixed
*) temp
)->page_order
;
923 num_entries
= ((struct aper_size_info_fixed
*) temp
)->num_entries
;
924 table
= alloc_gatt_pages(page_order
);
930 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
932 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
933 SetPageReserved(page
);
935 bridge
->gatt_table_real
= (u32
*) table
;
936 agp_gatt_table
= (void *)table
;
938 bridge
->driver
->cache_flush();
940 if (set_memory_uc((unsigned long)table
, 1 << page_order
))
941 printk(KERN_WARNING
"Could not set GATT table memory to UC!\n");
943 bridge
->gatt_table
= (u32 __iomem
*)table
;
945 bridge
->gatt_table
= ioremap_nocache(virt_to_phys(table
),
946 (PAGE_SIZE
* (1 << page_order
)));
947 bridge
->driver
->cache_flush();
950 if (bridge
->gatt_table
== NULL
) {
951 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
952 ClearPageReserved(page
);
954 free_gatt_pages(table
, page_order
);
958 bridge
->gatt_bus_addr
= virt_to_phys(bridge
->gatt_table_real
);
960 /* AK: bogus, should encode addresses > 4GB */
961 for (i
= 0; i
< num_entries
; i
++) {
962 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
963 readl(bridge
->gatt_table
+i
); /* PCI Posting. */
968 EXPORT_SYMBOL(agp_generic_create_gatt_table
);
970 int agp_generic_free_gatt_table(struct agp_bridge_data
*bridge
)
973 char *table
, *table_end
;
977 temp
= bridge
->current_size
;
979 switch (bridge
->driver
->size_type
) {
981 page_order
= A_SIZE_8(temp
)->page_order
;
984 page_order
= A_SIZE_16(temp
)->page_order
;
987 page_order
= A_SIZE_32(temp
)->page_order
;
989 case FIXED_APER_SIZE
:
990 page_order
= A_SIZE_FIX(temp
)->page_order
;
993 /* The generic routines can't deal with 2 level gatt's */
1000 /* Do not worry about freeing memory, because if this is
1001 * called, then all agp memory is deallocated and removed
1002 * from the table. */
1005 set_memory_wb((unsigned long)bridge
->gatt_table
, 1 << page_order
);
1007 iounmap(bridge
->gatt_table
);
1009 table
= (char *) bridge
->gatt_table_real
;
1010 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
1012 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
1013 ClearPageReserved(page
);
1015 free_gatt_pages(bridge
->gatt_table_real
, page_order
);
1017 agp_gatt_table
= NULL
;
1018 bridge
->gatt_table
= NULL
;
1019 bridge
->gatt_table_real
= NULL
;
1020 bridge
->gatt_bus_addr
= 0;
1024 EXPORT_SYMBOL(agp_generic_free_gatt_table
);
1027 int agp_generic_insert_memory(struct agp_memory
* mem
, off_t pg_start
, int type
)
1033 struct agp_bridge_data
*bridge
;
1036 bridge
= mem
->bridge
;
1040 if (mem
->page_count
== 0)
1043 temp
= bridge
->current_size
;
1045 switch (bridge
->driver
->size_type
) {
1047 num_entries
= A_SIZE_8(temp
)->num_entries
;
1050 num_entries
= A_SIZE_16(temp
)->num_entries
;
1053 num_entries
= A_SIZE_32(temp
)->num_entries
;
1055 case FIXED_APER_SIZE
:
1056 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
1058 case LVL2_APER_SIZE
:
1059 /* The generic routines can't deal with 2 level gatt's */
1066 num_entries
-= agp_memory_reserved
/PAGE_SIZE
;
1067 if (num_entries
< 0) num_entries
= 0;
1069 if (type
!= mem
->type
)
1072 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1073 if (mask_type
!= 0) {
1074 /* The generic routines know nothing of memory types */
1078 if (((pg_start
+ mem
->page_count
) > num_entries
) ||
1079 ((pg_start
+ mem
->page_count
) < pg_start
))
1084 while (j
< (pg_start
+ mem
->page_count
)) {
1085 if (!PGE_EMPTY(bridge
, readl(bridge
->gatt_table
+j
)))
1090 if (!mem
->is_flushed
) {
1091 bridge
->driver
->cache_flush();
1092 mem
->is_flushed
= true;
1095 for (i
= 0, j
= pg_start
; i
< mem
->page_count
; i
++, j
++) {
1096 writel(bridge
->driver
->mask_memory(bridge
,
1097 page_to_phys(mem
->pages
[i
]),
1099 bridge
->gatt_table
+j
);
1101 readl(bridge
->gatt_table
+j
-1); /* PCI Posting. */
1103 bridge
->driver
->tlb_flush(mem
);
1106 EXPORT_SYMBOL(agp_generic_insert_memory
);
1109 int agp_generic_remove_memory(struct agp_memory
*mem
, off_t pg_start
, int type
)
1112 struct agp_bridge_data
*bridge
;
1113 int mask_type
, num_entries
;
1115 bridge
= mem
->bridge
;
1119 if (mem
->page_count
== 0)
1122 if (type
!= mem
->type
)
1125 num_entries
= agp_num_entries();
1126 if (((pg_start
+ mem
->page_count
) > num_entries
) ||
1127 ((pg_start
+ mem
->page_count
) < pg_start
))
1130 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1131 if (mask_type
!= 0) {
1132 /* The generic routines know nothing of memory types */
1136 /* AK: bogus, should encode addresses > 4GB */
1137 for (i
= pg_start
; i
< (mem
->page_count
+ pg_start
); i
++) {
1138 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
1140 readl(bridge
->gatt_table
+i
-1); /* PCI Posting. */
1142 bridge
->driver
->tlb_flush(mem
);
1145 EXPORT_SYMBOL(agp_generic_remove_memory
);
1147 struct agp_memory
*agp_generic_alloc_by_type(size_t page_count
, int type
)
1151 EXPORT_SYMBOL(agp_generic_alloc_by_type
);
1153 void agp_generic_free_by_type(struct agp_memory
*curr
)
1155 agp_free_page_array(curr
);
1156 agp_free_key(curr
->key
);
1159 EXPORT_SYMBOL(agp_generic_free_by_type
);
1161 struct agp_memory
*agp_generic_alloc_user(size_t page_count
, int type
)
1163 struct agp_memory
*new;
1167 pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
1168 new = agp_create_user_memory(page_count
);
1172 for (i
= 0; i
< page_count
; i
++)
1173 new->pages
[i
] = NULL
;
1174 new->page_count
= 0;
1176 new->num_scratch_pages
= pages
;
1180 EXPORT_SYMBOL(agp_generic_alloc_user
);
1183 * Basic Page Allocation Routines -
1184 * These routines handle page allocation and by default they reserve the allocated
1185 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1186 * against a maximum value.
1189 int agp_generic_alloc_pages(struct agp_bridge_data
*bridge
, struct agp_memory
*mem
, size_t num_pages
)
1192 int i
, ret
= -ENOMEM
;
1194 for (i
= 0; i
< num_pages
; i
++) {
1195 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
| __GFP_ZERO
);
1196 /* agp_free_memory() needs gart address */
1201 map_page_into_agp(page
);
1204 atomic_inc(&agp_bridge
->current_memory_agp
);
1206 mem
->pages
[i
] = page
;
1211 set_pages_array_uc(mem
->pages
, num_pages
);
1217 EXPORT_SYMBOL(agp_generic_alloc_pages
);
1219 struct page
*agp_generic_alloc_page(struct agp_bridge_data
*bridge
)
1223 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
| __GFP_ZERO
);
1227 map_page_into_agp(page
);
1230 atomic_inc(&agp_bridge
->current_memory_agp
);
1233 EXPORT_SYMBOL(agp_generic_alloc_page
);
1235 void agp_generic_destroy_pages(struct agp_memory
*mem
)
1244 set_pages_array_wb(mem
->pages
, mem
->page_count
);
1247 for (i
= 0; i
< mem
->page_count
; i
++) {
1248 page
= mem
->pages
[i
];
1251 unmap_page_from_agp(page
);
1255 atomic_dec(&agp_bridge
->current_memory_agp
);
1256 mem
->pages
[i
] = NULL
;
1259 EXPORT_SYMBOL(agp_generic_destroy_pages
);
1261 void agp_generic_destroy_page(struct page
*page
, int flags
)
1266 if (flags
& AGP_PAGE_DESTROY_UNMAP
)
1267 unmap_page_from_agp(page
);
1269 if (flags
& AGP_PAGE_DESTROY_FREE
) {
1272 atomic_dec(&agp_bridge
->current_memory_agp
);
1275 EXPORT_SYMBOL(agp_generic_destroy_page
);
1277 /* End Basic Page Allocation Routines */
1281 * agp_enable - initialise the agp point-to-point connection.
1283 * @mode: agp mode register value to configure with.
1285 void agp_enable(struct agp_bridge_data
*bridge
, u32 mode
)
1289 bridge
->driver
->agp_enable(bridge
, mode
);
1291 EXPORT_SYMBOL(agp_enable
);
1293 /* When we remove the global variable agp_bridge from all drivers
1294 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1297 struct agp_bridge_data
*agp_generic_find_bridge(struct pci_dev
*pdev
)
1299 if (list_empty(&agp_bridges
))
1305 static void ipi_handler(void *null
)
1310 void global_cache_flush(void)
1312 if (on_each_cpu(ipi_handler
, NULL
, 1) != 0)
1313 panic(PFX
"timed out waiting for the other CPUs!\n");
1315 EXPORT_SYMBOL(global_cache_flush
);
1317 unsigned long agp_generic_mask_memory(struct agp_bridge_data
*bridge
,
1318 dma_addr_t addr
, int type
)
1320 /* memory type is ignored in the generic routine */
1321 if (bridge
->driver
->masks
)
1322 return addr
| bridge
->driver
->masks
[0].mask
;
1326 EXPORT_SYMBOL(agp_generic_mask_memory
);
1328 int agp_generic_type_to_mask_type(struct agp_bridge_data
*bridge
,
1331 if (type
>= AGP_USER_TYPES
)
1335 EXPORT_SYMBOL(agp_generic_type_to_mask_type
);
1338 * These functions are implemented according to the AGPv3 spec,
1339 * which covers implementation details that had previously been
1343 int agp3_generic_fetch_size(void)
1347 struct aper_size_info_16
*values
;
1349 pci_read_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, &temp_size
);
1350 values
= A_SIZE_16(agp_bridge
->driver
->aperture_sizes
);
1352 for (i
= 0; i
< agp_bridge
->driver
->num_aperture_sizes
; i
++) {
1353 if (temp_size
== values
[i
].size_value
) {
1354 agp_bridge
->previous_size
=
1355 agp_bridge
->current_size
= (void *) (values
+ i
);
1357 agp_bridge
->aperture_size_idx
= i
;
1358 return values
[i
].size
;
1363 EXPORT_SYMBOL(agp3_generic_fetch_size
);
1365 void agp3_generic_tlbflush(struct agp_memory
*mem
)
1368 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1369 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_GTLBEN
);
1370 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
);
1372 EXPORT_SYMBOL(agp3_generic_tlbflush
);
1374 int agp3_generic_configure(void)
1377 struct aper_size_info_16
*current_size
;
1379 current_size
= A_SIZE_16(agp_bridge
->current_size
);
1381 agp_bridge
->gart_bus_addr
= pci_bus_address(agp_bridge
->dev
,
1384 /* set aperture size */
1385 pci_write_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, current_size
->size_value
);
1386 /* set gart pointer */
1387 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPGARTLO
, agp_bridge
->gatt_bus_addr
);
1388 /* enable aperture and GTLB */
1389 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &temp
);
1390 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, temp
| AGPCTRL_APERENB
| AGPCTRL_GTLBEN
);
1393 EXPORT_SYMBOL(agp3_generic_configure
);
1395 void agp3_generic_cleanup(void)
1398 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1399 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_APERENB
);
1401 EXPORT_SYMBOL(agp3_generic_cleanup
);
1403 const struct aper_size_info_16 agp3_generic_sizes
[AGP_GENERIC_SIZES_ENTRIES
] =
1405 {4096, 1048576, 10,0x000},
1406 {2048, 524288, 9, 0x800},
1407 {1024, 262144, 8, 0xc00},
1408 { 512, 131072, 7, 0xe00},
1409 { 256, 65536, 6, 0xf00},
1410 { 128, 32768, 5, 0xf20},
1411 { 64, 16384, 4, 0xf30},
1412 { 32, 8192, 3, 0xf38},
1413 { 16, 4096, 2, 0xf3c},
1414 { 8, 2048, 1, 0xf3e},
1415 { 4, 1024, 0, 0xf3f}
1417 EXPORT_SYMBOL(agp3_generic_sizes
);