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
);
84 void agp_flush_chipset(struct agp_bridge_data
*bridge
)
86 if (bridge
->driver
->chipset_flush
)
87 bridge
->driver
->chipset_flush(bridge
);
89 EXPORT_SYMBOL(agp_flush_chipset
);
92 * Use kmalloc if possible for the page list. Otherwise fall back to
93 * vmalloc. This speeds things up and also saves memory for small AGP
97 void agp_alloc_page_array(size_t size
, struct agp_memory
*mem
)
101 if (size
<= 2*PAGE_SIZE
)
102 mem
->pages
= kmalloc(size
, GFP_KERNEL
| __GFP_NOWARN
);
103 if (mem
->pages
== NULL
) {
104 mem
->pages
= vmalloc(size
);
107 EXPORT_SYMBOL(agp_alloc_page_array
);
109 void agp_free_page_array(struct agp_memory
*mem
)
111 if (is_vmalloc_addr(mem
->pages
)) {
117 EXPORT_SYMBOL(agp_free_page_array
);
120 static struct agp_memory
*agp_create_user_memory(unsigned long num_agp_pages
)
122 struct agp_memory
*new;
123 unsigned long alloc_size
= num_agp_pages
*sizeof(struct page
*);
125 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
129 new->key
= agp_get_key();
136 agp_alloc_page_array(alloc_size
, new);
138 if (new->pages
== NULL
) {
139 agp_free_key(new->key
);
143 new->num_scratch_pages
= 0;
147 struct agp_memory
*agp_create_memory(int scratch_pages
)
149 struct agp_memory
*new;
151 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
155 new->key
= agp_get_key();
162 agp_alloc_page_array(PAGE_SIZE
* scratch_pages
, new);
164 if (new->pages
== NULL
) {
165 agp_free_key(new->key
);
169 new->num_scratch_pages
= scratch_pages
;
170 new->type
= AGP_NORMAL_MEMORY
;
173 EXPORT_SYMBOL(agp_create_memory
);
176 * agp_free_memory - free memory associated with an agp_memory pointer.
178 * @curr: agp_memory pointer to be freed.
180 * It is the only function that can be called when the backend is not owned
181 * by the caller. (So it can free memory on client death.)
183 void agp_free_memory(struct agp_memory
*curr
)
191 agp_unbind_memory(curr
);
193 if (curr
->type
>= AGP_USER_TYPES
) {
194 agp_generic_free_by_type(curr
);
198 if (curr
->type
!= 0) {
199 curr
->bridge
->driver
->free_by_type(curr
);
202 if (curr
->page_count
!= 0) {
203 if (curr
->bridge
->driver
->agp_destroy_pages
) {
204 curr
->bridge
->driver
->agp_destroy_pages(curr
);
207 for (i
= 0; i
< curr
->page_count
; i
++) {
208 curr
->bridge
->driver
->agp_destroy_page(
210 AGP_PAGE_DESTROY_UNMAP
);
212 for (i
= 0; i
< curr
->page_count
; i
++) {
213 curr
->bridge
->driver
->agp_destroy_page(
215 AGP_PAGE_DESTROY_FREE
);
219 agp_free_key(curr
->key
);
220 agp_free_page_array(curr
);
223 EXPORT_SYMBOL(agp_free_memory
);
225 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
228 * agp_allocate_memory - allocate a group of pages of a certain type.
230 * @page_count: size_t argument of the number of pages
231 * @type: u32 argument of the type of memory to be allocated.
233 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
234 * maps to physical ram. Any other type is device dependent.
236 * It returns NULL whenever memory is unavailable.
238 struct agp_memory
*agp_allocate_memory(struct agp_bridge_data
*bridge
,
239 size_t page_count
, u32 type
)
242 struct agp_memory
*new;
248 if ((atomic_read(&bridge
->current_memory_agp
) + page_count
) > bridge
->max_memory_agp
)
251 if (type
>= AGP_USER_TYPES
) {
252 new = agp_generic_alloc_user(page_count
, type
);
254 new->bridge
= bridge
;
259 new = bridge
->driver
->alloc_by_type(page_count
, type
);
261 new->bridge
= bridge
;
265 scratch_pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
267 new = agp_create_memory(scratch_pages
);
272 if (bridge
->driver
->agp_alloc_pages
) {
273 if (bridge
->driver
->agp_alloc_pages(bridge
, new, page_count
)) {
274 agp_free_memory(new);
277 new->bridge
= bridge
;
281 for (i
= 0; i
< page_count
; i
++) {
282 struct page
*page
= bridge
->driver
->agp_alloc_page(bridge
);
285 agp_free_memory(new);
288 new->pages
[i
] = page
;
291 new->bridge
= bridge
;
295 EXPORT_SYMBOL(agp_allocate_memory
);
298 /* End - Generic routines for handling agp_memory structures */
301 static int agp_return_size(void)
306 temp
= agp_bridge
->current_size
;
308 switch (agp_bridge
->driver
->size_type
) {
310 current_size
= A_SIZE_8(temp
)->size
;
313 current_size
= A_SIZE_16(temp
)->size
;
316 current_size
= A_SIZE_32(temp
)->size
;
319 current_size
= A_SIZE_LVL2(temp
)->size
;
321 case FIXED_APER_SIZE
:
322 current_size
= A_SIZE_FIX(temp
)->size
;
329 current_size
-= (agp_memory_reserved
/ (1024*1024));
336 int agp_num_entries(void)
341 temp
= agp_bridge
->current_size
;
343 switch (agp_bridge
->driver
->size_type
) {
345 num_entries
= A_SIZE_8(temp
)->num_entries
;
348 num_entries
= A_SIZE_16(temp
)->num_entries
;
351 num_entries
= A_SIZE_32(temp
)->num_entries
;
354 num_entries
= A_SIZE_LVL2(temp
)->num_entries
;
356 case FIXED_APER_SIZE
:
357 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
364 num_entries
-= agp_memory_reserved
>>PAGE_SHIFT
;
369 EXPORT_SYMBOL_GPL(agp_num_entries
);
373 * agp_copy_info - copy bridge state information
375 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
377 * This function copies information about the agp bridge device and the state of
378 * the agp backend into an agp_kern_info pointer.
380 int agp_copy_info(struct agp_bridge_data
*bridge
, struct agp_kern_info
*info
)
382 memset(info
, 0, sizeof(struct agp_kern_info
));
384 info
->chipset
= NOT_SUPPORTED
;
388 info
->version
.major
= bridge
->version
->major
;
389 info
->version
.minor
= bridge
->version
->minor
;
390 info
->chipset
= SUPPORTED
;
391 info
->device
= bridge
->dev
;
392 if (bridge
->mode
& AGPSTAT_MODE_3_0
)
393 info
->mode
= bridge
->mode
& ~AGP3_RESERVED_MASK
;
395 info
->mode
= bridge
->mode
& ~AGP2_RESERVED_MASK
;
396 info
->aper_base
= bridge
->gart_bus_addr
;
397 info
->aper_size
= agp_return_size();
398 info
->max_memory
= bridge
->max_memory_agp
;
399 info
->current_memory
= atomic_read(&bridge
->current_memory_agp
);
400 info
->cant_use_aperture
= bridge
->driver
->cant_use_aperture
;
401 info
->vm_ops
= bridge
->vm_ops
;
402 info
->page_mask
= ~0UL;
405 EXPORT_SYMBOL(agp_copy_info
);
407 /* End - Routine to copy over information structure */
410 * Routines for handling swapping of agp_memory into the GATT -
411 * These routines take agp_memory and insert them into the GATT.
412 * They call device specific routines to actually write to the GATT.
416 * agp_bind_memory - Bind an agp_memory structure into the GATT.
418 * @curr: agp_memory pointer
419 * @pg_start: an offset into the graphics aperture translation table
421 * It returns -EINVAL if the pointer == NULL.
422 * It returns -EBUSY if the area of the table requested is already in use.
424 int agp_bind_memory(struct agp_memory
*curr
, off_t pg_start
)
431 if (curr
->is_bound
) {
432 printk(KERN_INFO PFX
"memory %p is already bound!\n", curr
);
435 if (!curr
->is_flushed
) {
436 curr
->bridge
->driver
->cache_flush();
437 curr
->is_flushed
= true;
440 if (curr
->bridge
->driver
->agp_map_memory
) {
441 ret_val
= curr
->bridge
->driver
->agp_map_memory(curr
);
445 ret_val
= curr
->bridge
->driver
->insert_memory(curr
, pg_start
, curr
->type
);
450 curr
->is_bound
= true;
451 curr
->pg_start
= pg_start
;
452 spin_lock(&agp_bridge
->mapped_lock
);
453 list_add(&curr
->mapped_list
, &agp_bridge
->mapped_list
);
454 spin_unlock(&agp_bridge
->mapped_lock
);
458 EXPORT_SYMBOL(agp_bind_memory
);
462 * agp_unbind_memory - Removes an agp_memory structure from the GATT
464 * @curr: agp_memory pointer to be removed from the GATT.
466 * It returns -EINVAL if this piece of agp_memory is not currently bound to
467 * the graphics aperture translation table or if the agp_memory pointer == NULL
469 int agp_unbind_memory(struct agp_memory
*curr
)
476 if (!curr
->is_bound
) {
477 printk(KERN_INFO PFX
"memory %p was not bound!\n", curr
);
481 ret_val
= curr
->bridge
->driver
->remove_memory(curr
, curr
->pg_start
, curr
->type
);
486 if (curr
->bridge
->driver
->agp_unmap_memory
)
487 curr
->bridge
->driver
->agp_unmap_memory(curr
);
489 curr
->is_bound
= false;
491 spin_lock(&curr
->bridge
->mapped_lock
);
492 list_del(&curr
->mapped_list
);
493 spin_unlock(&curr
->bridge
->mapped_lock
);
496 EXPORT_SYMBOL(agp_unbind_memory
);
499 * agp_rebind_emmory - Rewrite the entire GATT, useful on resume
501 int agp_rebind_memory(void)
503 struct agp_memory
*curr
;
506 spin_lock(&agp_bridge
->mapped_lock
);
507 list_for_each_entry(curr
, &agp_bridge
->mapped_list
, mapped_list
) {
508 ret_val
= curr
->bridge
->driver
->insert_memory(curr
,
514 spin_unlock(&agp_bridge
->mapped_lock
);
517 EXPORT_SYMBOL(agp_rebind_memory
);
519 /* End - Routines for handling swapping of agp_memory into the GATT */
522 /* Generic Agp routines - Start */
523 static void agp_v2_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
527 if (*requested_mode
& AGP2_RESERVED_MASK
) {
528 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
529 *requested_mode
& AGP2_RESERVED_MASK
, *requested_mode
);
530 *requested_mode
&= ~AGP2_RESERVED_MASK
;
534 * Some dumb bridges are programmed to disobey the AGP2 spec.
535 * This is likely a BIOS misprogramming rather than poweron default, or
536 * it would be a lot more common.
537 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
538 * AGPv2 spec 6.1.9 states:
539 * The RATE field indicates the data transfer rates supported by this
540 * device. A.G.P. devices must report all that apply.
541 * Fix them up as best we can.
543 switch (*bridge_agpstat
& 7) {
545 *bridge_agpstat
|= (AGPSTAT2_2X
| AGPSTAT2_1X
);
546 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x4 rate"
547 "Fixing up support for x2 & x1\n");
550 *bridge_agpstat
|= AGPSTAT2_1X
;
551 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x2 rate"
552 "Fixing up support for x1\n");
558 /* Check the speed bits make sense. Only one should be set. */
559 tmp
= *requested_mode
& 7;
562 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to x1 mode.\n", current
->comm
);
563 *requested_mode
|= AGPSTAT2_1X
;
569 *requested_mode
&= ~(AGPSTAT2_1X
); /* rate=2 */
576 *requested_mode
&= ~(AGPSTAT2_1X
|AGPSTAT2_2X
); /* rate=4*/
580 /* disable SBA if it's not supported */
581 if (!((*bridge_agpstat
& AGPSTAT_SBA
) && (*vga_agpstat
& AGPSTAT_SBA
) && (*requested_mode
& AGPSTAT_SBA
)))
582 *bridge_agpstat
&= ~AGPSTAT_SBA
;
585 if (!((*bridge_agpstat
& AGPSTAT2_4X
) && (*vga_agpstat
& AGPSTAT2_4X
) && (*requested_mode
& AGPSTAT2_4X
)))
586 *bridge_agpstat
&= ~AGPSTAT2_4X
;
588 if (!((*bridge_agpstat
& AGPSTAT2_2X
) && (*vga_agpstat
& AGPSTAT2_2X
) && (*requested_mode
& AGPSTAT2_2X
)))
589 *bridge_agpstat
&= ~AGPSTAT2_2X
;
591 if (!((*bridge_agpstat
& AGPSTAT2_1X
) && (*vga_agpstat
& AGPSTAT2_1X
) && (*requested_mode
& AGPSTAT2_1X
)))
592 *bridge_agpstat
&= ~AGPSTAT2_1X
;
594 /* Now we know what mode it should be, clear out the unwanted bits. */
595 if (*bridge_agpstat
& AGPSTAT2_4X
)
596 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_2X
); /* 4X */
598 if (*bridge_agpstat
& AGPSTAT2_2X
)
599 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_4X
); /* 2X */
601 if (*bridge_agpstat
& AGPSTAT2_1X
)
602 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
); /* 1X */
604 /* Apply any errata. */
605 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
606 *bridge_agpstat
&= ~AGPSTAT_FW
;
608 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
609 *bridge_agpstat
&= ~AGPSTAT_SBA
;
611 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
612 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
613 *bridge_agpstat
|= AGPSTAT2_1X
;
616 /* If we've dropped down to 1X, disable fast writes. */
617 if (*bridge_agpstat
& AGPSTAT2_1X
)
618 *bridge_agpstat
&= ~AGPSTAT_FW
;
622 * requested_mode = Mode requested by (typically) X.
623 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
624 * vga_agpstat = PCI_AGP_STATUS from graphic card.
626 static void agp_v3_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
628 u32 origbridge
=*bridge_agpstat
, origvga
=*vga_agpstat
;
631 if (*requested_mode
& AGP3_RESERVED_MASK
) {
632 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
633 *requested_mode
& AGP3_RESERVED_MASK
, *requested_mode
);
634 *requested_mode
&= ~AGP3_RESERVED_MASK
;
637 /* Check the speed bits make sense. */
638 tmp
= *requested_mode
& 7;
640 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current
->comm
);
641 *requested_mode
|= AGPSTAT3_4X
;
644 printk(KERN_INFO PFX
"%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current
->comm
, tmp
* 4);
645 *requested_mode
= (*requested_mode
& ~7) | AGPSTAT3_8X
;
648 /* ARQSZ - Set the value to the maximum one.
649 * Don't allow the mode register to override values. */
650 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_ARQSZ
) |
651 max_t(u32
,(*bridge_agpstat
& AGPSTAT_ARQSZ
),(*vga_agpstat
& AGPSTAT_ARQSZ
)));
653 /* Calibration cycle.
654 * Don't allow the mode register to override values. */
655 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_CAL_MASK
) |
656 min_t(u32
,(*bridge_agpstat
& AGPSTAT_CAL_MASK
),(*vga_agpstat
& AGPSTAT_CAL_MASK
)));
658 /* SBA *must* be supported for AGP v3 */
659 *bridge_agpstat
|= AGPSTAT_SBA
;
663 * Check for invalid speeds. This can happen when applications
664 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
666 if (*requested_mode
& AGPSTAT_MODE_3_0
) {
668 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
669 * have been passed a 3.0 mode, but with 2.x speed bits set.
670 * AGP2.x 4x -> AGP3.0 4x.
672 if (*requested_mode
& AGPSTAT2_4X
) {
673 printk(KERN_INFO PFX
"%s passes broken AGP3 flags (%x). Fixed.\n",
674 current
->comm
, *requested_mode
);
675 *requested_mode
&= ~AGPSTAT2_4X
;
676 *requested_mode
|= AGPSTAT3_4X
;
680 * The caller doesn't know what they are doing. We are in 3.0 mode,
681 * but have been passed an AGP 2.x mode.
682 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
684 printk(KERN_INFO PFX
"%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
685 current
->comm
, *requested_mode
);
686 *requested_mode
&= ~(AGPSTAT2_4X
| AGPSTAT2_2X
| AGPSTAT2_1X
);
687 *requested_mode
|= AGPSTAT3_4X
;
690 if (*requested_mode
& AGPSTAT3_8X
) {
691 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
692 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
693 *bridge_agpstat
|= AGPSTAT3_4X
;
694 printk(KERN_INFO PFX
"%s requested AGPx8 but bridge not capable.\n", current
->comm
);
697 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
698 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
699 *bridge_agpstat
|= AGPSTAT3_4X
;
700 printk(KERN_INFO PFX
"%s requested AGPx8 but graphic card not capable.\n", current
->comm
);
703 /* All set, bridge & device can do AGP x8*/
704 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
707 } else if (*requested_mode
& AGPSTAT3_4X
) {
708 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
709 *bridge_agpstat
|= AGPSTAT3_4X
;
715 * If we didn't specify an AGP mode, we see if both
716 * the graphics card, and the bridge can do x8, and use if so.
717 * If not, we fall back to x4 mode.
719 if ((*bridge_agpstat
& AGPSTAT3_8X
) && (*vga_agpstat
& AGPSTAT3_8X
)) {
720 printk(KERN_INFO PFX
"No AGP mode specified. Setting to highest mode "
721 "supported by bridge & card (x8).\n");
722 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
723 *vga_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
725 printk(KERN_INFO PFX
"Fell back to AGPx4 mode because");
726 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
727 printk(KERN_INFO PFX
"bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
728 *bridge_agpstat
, origbridge
);
729 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
730 *bridge_agpstat
|= AGPSTAT3_4X
;
732 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
733 printk(KERN_INFO PFX
"graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
734 *vga_agpstat
, origvga
);
735 *vga_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
736 *vga_agpstat
|= AGPSTAT3_4X
;
742 /* Apply any errata. */
743 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
744 *bridge_agpstat
&= ~AGPSTAT_FW
;
746 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
747 *bridge_agpstat
&= ~AGPSTAT_SBA
;
749 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
750 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
751 *bridge_agpstat
|= AGPSTAT2_1X
;
757 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
758 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
759 * @requested_mode: requested agp_stat from userspace (Typically from X)
760 * @bridge_agpstat: current agp_stat from AGP bridge.
762 * This function will hunt for an AGP graphics card, and try to match
763 * the requested mode to the capabilities of both the bridge and the card.
765 u32
agp_collect_device_status(struct agp_bridge_data
*bridge
, u32 requested_mode
, u32 bridge_agpstat
)
767 struct pci_dev
*device
= NULL
;
772 device
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, device
);
774 printk(KERN_INFO PFX
"Couldn't find an AGP VGA controller.\n");
777 cap_ptr
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
783 * Ok, here we have a AGP device. Disable impossible
784 * settings, and adjust the readqueue to the minimum.
786 pci_read_config_dword(device
, cap_ptr
+PCI_AGP_STATUS
, &vga_agpstat
);
788 /* adjust RQ depth */
789 bridge_agpstat
= ((bridge_agpstat
& ~AGPSTAT_RQ_DEPTH
) |
790 min_t(u32
, (requested_mode
& AGPSTAT_RQ_DEPTH
),
791 min_t(u32
, (bridge_agpstat
& AGPSTAT_RQ_DEPTH
), (vga_agpstat
& AGPSTAT_RQ_DEPTH
))));
793 /* disable FW if it's not supported */
794 if (!((bridge_agpstat
& AGPSTAT_FW
) &&
795 (vga_agpstat
& AGPSTAT_FW
) &&
796 (requested_mode
& AGPSTAT_FW
)))
797 bridge_agpstat
&= ~AGPSTAT_FW
;
799 /* Check to see if we are operating in 3.0 mode */
800 if (agp_bridge
->mode
& AGPSTAT_MODE_3_0
)
801 agp_v3_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
803 agp_v2_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
806 return bridge_agpstat
;
808 EXPORT_SYMBOL(agp_collect_device_status
);
811 void agp_device_command(u32 bridge_agpstat
, bool agp_v3
)
813 struct pci_dev
*device
= NULL
;
816 mode
= bridge_agpstat
& 0x7;
820 for_each_pci_dev(device
) {
821 u8 agp
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
825 dev_info(&device
->dev
, "putting AGP V%d device into %dx mode\n",
826 agp_v3
? 3 : 2, mode
);
827 pci_write_config_dword(device
, agp
+ PCI_AGP_COMMAND
, bridge_agpstat
);
830 EXPORT_SYMBOL(agp_device_command
);
833 void get_agp_version(struct agp_bridge_data
*bridge
)
837 /* Exit early if already set by errata workarounds. */
838 if (bridge
->major_version
!= 0)
841 pci_read_config_dword(bridge
->dev
, bridge
->capndx
, &ncapid
);
842 bridge
->major_version
= (ncapid
>> AGP_MAJOR_VERSION_SHIFT
) & 0xf;
843 bridge
->minor_version
= (ncapid
>> AGP_MINOR_VERSION_SHIFT
) & 0xf;
845 EXPORT_SYMBOL(get_agp_version
);
848 void agp_generic_enable(struct agp_bridge_data
*bridge
, u32 requested_mode
)
850 u32 bridge_agpstat
, temp
;
852 get_agp_version(agp_bridge
);
854 dev_info(&agp_bridge
->dev
->dev
, "AGP %d.%d bridge\n",
855 agp_bridge
->major_version
, agp_bridge
->minor_version
);
857 pci_read_config_dword(agp_bridge
->dev
,
858 agp_bridge
->capndx
+ PCI_AGP_STATUS
, &bridge_agpstat
);
860 bridge_agpstat
= agp_collect_device_status(agp_bridge
, requested_mode
, bridge_agpstat
);
861 if (bridge_agpstat
== 0)
864 bridge_agpstat
|= AGPSTAT_AGP_ENABLE
;
866 /* Do AGP version specific frobbing. */
867 if (bridge
->major_version
>= 3) {
868 if (bridge
->mode
& AGPSTAT_MODE_3_0
) {
869 /* If we have 3.5, we can do the isoch stuff. */
870 if (bridge
->minor_version
>= 5)
871 agp_3_5_enable(bridge
);
872 agp_device_command(bridge_agpstat
, true);
875 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
876 bridge_agpstat
&= ~(7<<10) ;
877 pci_read_config_dword(bridge
->dev
,
878 bridge
->capndx
+AGPCTRL
, &temp
);
880 pci_write_config_dword(bridge
->dev
,
881 bridge
->capndx
+AGPCTRL
, temp
);
883 dev_info(&bridge
->dev
->dev
, "bridge is in legacy mode, falling back to 2.x\n");
888 agp_device_command(bridge_agpstat
, false);
890 EXPORT_SYMBOL(agp_generic_enable
);
893 int agp_generic_create_gatt_table(struct agp_bridge_data
*bridge
)
904 /* The generic routines can't handle 2 level gatt's */
905 if (bridge
->driver
->size_type
== LVL2_APER_SIZE
)
909 i
= bridge
->aperture_size_idx
;
910 temp
= bridge
->current_size
;
911 size
= page_order
= num_entries
= 0;
913 if (bridge
->driver
->size_type
!= FIXED_APER_SIZE
) {
915 switch (bridge
->driver
->size_type
) {
917 size
= A_SIZE_8(temp
)->size
;
919 A_SIZE_8(temp
)->page_order
;
921 A_SIZE_8(temp
)->num_entries
;
924 size
= A_SIZE_16(temp
)->size
;
925 page_order
= A_SIZE_16(temp
)->page_order
;
926 num_entries
= A_SIZE_16(temp
)->num_entries
;
929 size
= A_SIZE_32(temp
)->size
;
930 page_order
= A_SIZE_32(temp
)->page_order
;
931 num_entries
= A_SIZE_32(temp
)->num_entries
;
933 /* This case will never really happen. */
934 case FIXED_APER_SIZE
:
937 size
= page_order
= num_entries
= 0;
941 table
= alloc_gatt_pages(page_order
);
945 switch (bridge
->driver
->size_type
) {
947 bridge
->current_size
= A_IDX8(bridge
);
950 bridge
->current_size
= A_IDX16(bridge
);
953 bridge
->current_size
= A_IDX32(bridge
);
955 /* These cases will never really happen. */
956 case FIXED_APER_SIZE
:
961 temp
= bridge
->current_size
;
963 bridge
->aperture_size_idx
= i
;
965 } while (!table
&& (i
< bridge
->driver
->num_aperture_sizes
));
967 size
= ((struct aper_size_info_fixed
*) temp
)->size
;
968 page_order
= ((struct aper_size_info_fixed
*) temp
)->page_order
;
969 num_entries
= ((struct aper_size_info_fixed
*) temp
)->num_entries
;
970 table
= alloc_gatt_pages(page_order
);
976 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
978 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
979 SetPageReserved(page
);
981 bridge
->gatt_table_real
= (u32
*) table
;
982 agp_gatt_table
= (void *)table
;
984 bridge
->driver
->cache_flush();
986 set_memory_uc((unsigned long)table
, 1 << page_order
);
987 bridge
->gatt_table
= (void *)table
;
989 bridge
->gatt_table
= ioremap_nocache(virt_to_phys(table
),
990 (PAGE_SIZE
* (1 << page_order
)));
991 bridge
->driver
->cache_flush();
994 if (bridge
->gatt_table
== NULL
) {
995 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
996 ClearPageReserved(page
);
998 free_gatt_pages(table
, page_order
);
1002 bridge
->gatt_bus_addr
= virt_to_phys(bridge
->gatt_table_real
);
1004 /* AK: bogus, should encode addresses > 4GB */
1005 for (i
= 0; i
< num_entries
; i
++) {
1006 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
1007 readl(bridge
->gatt_table
+i
); /* PCI Posting. */
1012 EXPORT_SYMBOL(agp_generic_create_gatt_table
);
1014 int agp_generic_free_gatt_table(struct agp_bridge_data
*bridge
)
1017 char *table
, *table_end
;
1021 temp
= bridge
->current_size
;
1023 switch (bridge
->driver
->size_type
) {
1025 page_order
= A_SIZE_8(temp
)->page_order
;
1028 page_order
= A_SIZE_16(temp
)->page_order
;
1031 page_order
= A_SIZE_32(temp
)->page_order
;
1033 case FIXED_APER_SIZE
:
1034 page_order
= A_SIZE_FIX(temp
)->page_order
;
1036 case LVL2_APER_SIZE
:
1037 /* The generic routines can't deal with 2 level gatt's */
1045 /* Do not worry about freeing memory, because if this is
1046 * called, then all agp memory is deallocated and removed
1047 * from the table. */
1050 set_memory_wb((unsigned long)bridge
->gatt_table
, 1 << page_order
);
1052 iounmap(bridge
->gatt_table
);
1054 table
= (char *) bridge
->gatt_table_real
;
1055 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
1057 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
1058 ClearPageReserved(page
);
1060 free_gatt_pages(bridge
->gatt_table_real
, page_order
);
1062 agp_gatt_table
= NULL
;
1063 bridge
->gatt_table
= NULL
;
1064 bridge
->gatt_table_real
= NULL
;
1065 bridge
->gatt_bus_addr
= 0;
1069 EXPORT_SYMBOL(agp_generic_free_gatt_table
);
1072 int agp_generic_insert_memory(struct agp_memory
* mem
, off_t pg_start
, int type
)
1078 struct agp_bridge_data
*bridge
;
1081 bridge
= mem
->bridge
;
1085 if (mem
->page_count
== 0)
1088 temp
= bridge
->current_size
;
1090 switch (bridge
->driver
->size_type
) {
1092 num_entries
= A_SIZE_8(temp
)->num_entries
;
1095 num_entries
= A_SIZE_16(temp
)->num_entries
;
1098 num_entries
= A_SIZE_32(temp
)->num_entries
;
1100 case FIXED_APER_SIZE
:
1101 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
1103 case LVL2_APER_SIZE
:
1104 /* The generic routines can't deal with 2 level gatt's */
1112 num_entries
-= agp_memory_reserved
/PAGE_SIZE
;
1113 if (num_entries
< 0) num_entries
= 0;
1115 if (type
!= mem
->type
)
1118 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1119 if (mask_type
!= 0) {
1120 /* The generic routines know nothing of memory types */
1124 /* AK: could wrap */
1125 if ((pg_start
+ mem
->page_count
) > num_entries
)
1130 while (j
< (pg_start
+ mem
->page_count
)) {
1131 if (!PGE_EMPTY(bridge
, readl(bridge
->gatt_table
+j
)))
1136 if (!mem
->is_flushed
) {
1137 bridge
->driver
->cache_flush();
1138 mem
->is_flushed
= true;
1141 for (i
= 0, j
= pg_start
; i
< mem
->page_count
; i
++, j
++) {
1142 writel(bridge
->driver
->mask_memory(bridge
,
1143 page_to_phys(mem
->pages
[i
]),
1145 bridge
->gatt_table
+j
);
1147 readl(bridge
->gatt_table
+j
-1); /* PCI Posting. */
1149 bridge
->driver
->tlb_flush(mem
);
1152 EXPORT_SYMBOL(agp_generic_insert_memory
);
1155 int agp_generic_remove_memory(struct agp_memory
*mem
, off_t pg_start
, int type
)
1158 struct agp_bridge_data
*bridge
;
1161 bridge
= mem
->bridge
;
1165 if (mem
->page_count
== 0)
1168 if (type
!= mem
->type
)
1171 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1172 if (mask_type
!= 0) {
1173 /* The generic routines know nothing of memory types */
1177 /* AK: bogus, should encode addresses > 4GB */
1178 for (i
= pg_start
; i
< (mem
->page_count
+ pg_start
); i
++) {
1179 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
1181 readl(bridge
->gatt_table
+i
-1); /* PCI Posting. */
1183 bridge
->driver
->tlb_flush(mem
);
1186 EXPORT_SYMBOL(agp_generic_remove_memory
);
1188 struct agp_memory
*agp_generic_alloc_by_type(size_t page_count
, int type
)
1192 EXPORT_SYMBOL(agp_generic_alloc_by_type
);
1194 void agp_generic_free_by_type(struct agp_memory
*curr
)
1196 agp_free_page_array(curr
);
1197 agp_free_key(curr
->key
);
1200 EXPORT_SYMBOL(agp_generic_free_by_type
);
1202 struct agp_memory
*agp_generic_alloc_user(size_t page_count
, int type
)
1204 struct agp_memory
*new;
1208 pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
1209 new = agp_create_user_memory(page_count
);
1213 for (i
= 0; i
< page_count
; i
++)
1214 new->pages
[i
] = NULL
;
1215 new->page_count
= 0;
1217 new->num_scratch_pages
= pages
;
1221 EXPORT_SYMBOL(agp_generic_alloc_user
);
1224 * Basic Page Allocation Routines -
1225 * These routines handle page allocation and by default they reserve the allocated
1226 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1227 * against a maximum value.
1230 int agp_generic_alloc_pages(struct agp_bridge_data
*bridge
, struct agp_memory
*mem
, size_t num_pages
)
1233 int i
, ret
= -ENOMEM
;
1235 for (i
= 0; i
< num_pages
; i
++) {
1236 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
| __GFP_ZERO
);
1237 /* agp_free_memory() needs gart address */
1242 map_page_into_agp(page
);
1245 atomic_inc(&agp_bridge
->current_memory_agp
);
1247 mem
->pages
[i
] = page
;
1252 set_pages_array_uc(mem
->pages
, num_pages
);
1258 EXPORT_SYMBOL(agp_generic_alloc_pages
);
1260 struct page
*agp_generic_alloc_page(struct agp_bridge_data
*bridge
)
1264 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
| __GFP_ZERO
);
1268 map_page_into_agp(page
);
1271 atomic_inc(&agp_bridge
->current_memory_agp
);
1274 EXPORT_SYMBOL(agp_generic_alloc_page
);
1276 void agp_generic_destroy_pages(struct agp_memory
*mem
)
1285 set_pages_array_wb(mem
->pages
, mem
->page_count
);
1288 for (i
= 0; i
< mem
->page_count
; i
++) {
1289 page
= mem
->pages
[i
];
1292 unmap_page_from_agp(page
);
1296 atomic_dec(&agp_bridge
->current_memory_agp
);
1297 mem
->pages
[i
] = NULL
;
1300 EXPORT_SYMBOL(agp_generic_destroy_pages
);
1302 void agp_generic_destroy_page(struct page
*page
, int flags
)
1307 if (flags
& AGP_PAGE_DESTROY_UNMAP
)
1308 unmap_page_from_agp(page
);
1310 if (flags
& AGP_PAGE_DESTROY_FREE
) {
1313 atomic_dec(&agp_bridge
->current_memory_agp
);
1316 EXPORT_SYMBOL(agp_generic_destroy_page
);
1318 /* End Basic Page Allocation Routines */
1322 * agp_enable - initialise the agp point-to-point connection.
1324 * @mode: agp mode register value to configure with.
1326 void agp_enable(struct agp_bridge_data
*bridge
, u32 mode
)
1330 bridge
->driver
->agp_enable(bridge
, mode
);
1332 EXPORT_SYMBOL(agp_enable
);
1334 /* When we remove the global variable agp_bridge from all drivers
1335 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1338 struct agp_bridge_data
*agp_generic_find_bridge(struct pci_dev
*pdev
)
1340 if (list_empty(&agp_bridges
))
1346 static void ipi_handler(void *null
)
1351 void global_cache_flush(void)
1353 if (on_each_cpu(ipi_handler
, NULL
, 1) != 0)
1354 panic(PFX
"timed out waiting for the other CPUs!\n");
1356 EXPORT_SYMBOL(global_cache_flush
);
1358 unsigned long agp_generic_mask_memory(struct agp_bridge_data
*bridge
,
1359 dma_addr_t addr
, int type
)
1361 /* memory type is ignored in the generic routine */
1362 if (bridge
->driver
->masks
)
1363 return addr
| bridge
->driver
->masks
[0].mask
;
1367 EXPORT_SYMBOL(agp_generic_mask_memory
);
1369 int agp_generic_type_to_mask_type(struct agp_bridge_data
*bridge
,
1372 if (type
>= AGP_USER_TYPES
)
1376 EXPORT_SYMBOL(agp_generic_type_to_mask_type
);
1379 * These functions are implemented according to the AGPv3 spec,
1380 * which covers implementation details that had previously been
1384 int agp3_generic_fetch_size(void)
1388 struct aper_size_info_16
*values
;
1390 pci_read_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, &temp_size
);
1391 values
= A_SIZE_16(agp_bridge
->driver
->aperture_sizes
);
1393 for (i
= 0; i
< agp_bridge
->driver
->num_aperture_sizes
; i
++) {
1394 if (temp_size
== values
[i
].size_value
) {
1395 agp_bridge
->previous_size
=
1396 agp_bridge
->current_size
= (void *) (values
+ i
);
1398 agp_bridge
->aperture_size_idx
= i
;
1399 return values
[i
].size
;
1404 EXPORT_SYMBOL(agp3_generic_fetch_size
);
1406 void agp3_generic_tlbflush(struct agp_memory
*mem
)
1409 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1410 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_GTLBEN
);
1411 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
);
1413 EXPORT_SYMBOL(agp3_generic_tlbflush
);
1415 int agp3_generic_configure(void)
1418 struct aper_size_info_16
*current_size
;
1420 current_size
= A_SIZE_16(agp_bridge
->current_size
);
1422 pci_read_config_dword(agp_bridge
->dev
, AGP_APBASE
, &temp
);
1423 agp_bridge
->gart_bus_addr
= (temp
& PCI_BASE_ADDRESS_MEM_MASK
);
1425 /* set aperture size */
1426 pci_write_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, current_size
->size_value
);
1427 /* set gart pointer */
1428 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPGARTLO
, agp_bridge
->gatt_bus_addr
);
1429 /* enable aperture and GTLB */
1430 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &temp
);
1431 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, temp
| AGPCTRL_APERENB
| AGPCTRL_GTLBEN
);
1434 EXPORT_SYMBOL(agp3_generic_configure
);
1436 void agp3_generic_cleanup(void)
1439 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1440 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_APERENB
);
1442 EXPORT_SYMBOL(agp3_generic_cleanup
);
1444 const struct aper_size_info_16 agp3_generic_sizes
[AGP_GENERIC_SIZES_ENTRIES
] =
1446 {4096, 1048576, 10,0x000},
1447 {2048, 524288, 9, 0x800},
1448 {1024, 262144, 8, 0xc00},
1449 { 512, 131072, 7, 0xe00},
1450 { 256, 65536, 6, 0xf00},
1451 { 128, 32768, 5, 0xf20},
1452 { 64, 16384, 4, 0xf30},
1453 { 32, 8192, 3, 0xf38},
1454 { 16, 4096, 2, 0xf3c},
1455 { 8, 2048, 1, 0xf3e},
1456 { 4, 1024, 0, 0xf3f}
1458 EXPORT_SYMBOL(agp3_generic_sizes
);