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>
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
);
83 void agp_flush_chipset(struct agp_bridge_data
*bridge
)
85 if (bridge
->driver
->chipset_flush
)
86 bridge
->driver
->chipset_flush(bridge
);
88 EXPORT_SYMBOL(agp_flush_chipset
);
91 * Use kmalloc if possible for the page list. Otherwise fall back to
92 * vmalloc. This speeds things up and also saves memory for small AGP
96 void agp_alloc_page_array(size_t size
, struct agp_memory
*mem
)
99 mem
->vmalloc_flag
= false;
101 if (size
<= 2*PAGE_SIZE
)
102 mem
->memory
= kmalloc(size
, GFP_KERNEL
| __GFP_NORETRY
);
103 if (mem
->memory
== NULL
) {
104 mem
->memory
= vmalloc(size
);
105 mem
->vmalloc_flag
= true;
108 EXPORT_SYMBOL(agp_alloc_page_array
);
110 void agp_free_page_array(struct agp_memory
*mem
)
112 if (mem
->vmalloc_flag
) {
118 EXPORT_SYMBOL(agp_free_page_array
);
121 static struct agp_memory
*agp_create_user_memory(unsigned long num_agp_pages
)
123 struct agp_memory
*new;
124 unsigned long alloc_size
= num_agp_pages
*sizeof(struct page
*);
126 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
130 new->key
= agp_get_key();
137 agp_alloc_page_array(alloc_size
, new);
139 if (new->memory
== NULL
) {
140 agp_free_key(new->key
);
144 new->num_scratch_pages
= 0;
148 struct agp_memory
*agp_create_memory(int scratch_pages
)
150 struct agp_memory
*new;
152 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
156 new->key
= agp_get_key();
163 agp_alloc_page_array(PAGE_SIZE
* scratch_pages
, new);
165 if (new->memory
== NULL
) {
166 agp_free_key(new->key
);
170 new->num_scratch_pages
= scratch_pages
;
171 new->type
= AGP_NORMAL_MEMORY
;
174 EXPORT_SYMBOL(agp_create_memory
);
177 * agp_free_memory - free memory associated with an agp_memory pointer.
179 * @curr: agp_memory pointer to be freed.
181 * It is the only function that can be called when the backend is not owned
182 * by the caller. (So it can free memory on client death.)
184 void agp_free_memory(struct agp_memory
*curr
)
192 agp_unbind_memory(curr
);
194 if (curr
->type
>= AGP_USER_TYPES
) {
195 agp_generic_free_by_type(curr
);
199 if (curr
->type
!= 0) {
200 curr
->bridge
->driver
->free_by_type(curr
);
203 if (curr
->page_count
!= 0) {
204 for (i
= 0; i
< curr
->page_count
; i
++) {
205 curr
->memory
[i
] = (unsigned long)gart_to_virt(curr
->memory
[i
]);
206 curr
->bridge
->driver
->agp_destroy_page((void *)curr
->memory
[i
],
207 AGP_PAGE_DESTROY_UNMAP
);
209 for (i
= 0; i
< curr
->page_count
; i
++) {
210 curr
->bridge
->driver
->agp_destroy_page((void *)curr
->memory
[i
],
211 AGP_PAGE_DESTROY_FREE
);
214 agp_free_key(curr
->key
);
215 agp_free_page_array(curr
);
218 EXPORT_SYMBOL(agp_free_memory
);
220 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
223 * agp_allocate_memory - allocate a group of pages of a certain type.
225 * @page_count: size_t argument of the number of pages
226 * @type: u32 argument of the type of memory to be allocated.
228 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
229 * maps to physical ram. Any other type is device dependent.
231 * It returns NULL whenever memory is unavailable.
233 struct agp_memory
*agp_allocate_memory(struct agp_bridge_data
*bridge
,
234 size_t page_count
, u32 type
)
237 struct agp_memory
*new;
243 if ((atomic_read(&bridge
->current_memory_agp
) + page_count
) > bridge
->max_memory_agp
)
246 if (type
>= AGP_USER_TYPES
) {
247 new = agp_generic_alloc_user(page_count
, type
);
249 new->bridge
= bridge
;
254 new = bridge
->driver
->alloc_by_type(page_count
, type
);
256 new->bridge
= bridge
;
260 scratch_pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
262 new = agp_create_memory(scratch_pages
);
267 for (i
= 0; i
< page_count
; i
++) {
268 void *addr
= bridge
->driver
->agp_alloc_page(bridge
);
271 agp_free_memory(new);
274 new->memory
[i
] = virt_to_gart(addr
);
277 new->bridge
= bridge
;
281 EXPORT_SYMBOL(agp_allocate_memory
);
284 /* End - Generic routines for handling agp_memory structures */
287 static int agp_return_size(void)
292 temp
= agp_bridge
->current_size
;
294 switch (agp_bridge
->driver
->size_type
) {
296 current_size
= A_SIZE_8(temp
)->size
;
299 current_size
= A_SIZE_16(temp
)->size
;
302 current_size
= A_SIZE_32(temp
)->size
;
305 current_size
= A_SIZE_LVL2(temp
)->size
;
307 case FIXED_APER_SIZE
:
308 current_size
= A_SIZE_FIX(temp
)->size
;
315 current_size
-= (agp_memory_reserved
/ (1024*1024));
322 int agp_num_entries(void)
327 temp
= agp_bridge
->current_size
;
329 switch (agp_bridge
->driver
->size_type
) {
331 num_entries
= A_SIZE_8(temp
)->num_entries
;
334 num_entries
= A_SIZE_16(temp
)->num_entries
;
337 num_entries
= A_SIZE_32(temp
)->num_entries
;
340 num_entries
= A_SIZE_LVL2(temp
)->num_entries
;
342 case FIXED_APER_SIZE
:
343 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
350 num_entries
-= agp_memory_reserved
>>PAGE_SHIFT
;
355 EXPORT_SYMBOL_GPL(agp_num_entries
);
359 * agp_copy_info - copy bridge state information
361 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
363 * This function copies information about the agp bridge device and the state of
364 * the agp backend into an agp_kern_info pointer.
366 int agp_copy_info(struct agp_bridge_data
*bridge
, struct agp_kern_info
*info
)
368 memset(info
, 0, sizeof(struct agp_kern_info
));
370 info
->chipset
= NOT_SUPPORTED
;
374 info
->version
.major
= bridge
->version
->major
;
375 info
->version
.minor
= bridge
->version
->minor
;
376 info
->chipset
= SUPPORTED
;
377 info
->device
= bridge
->dev
;
378 if (bridge
->mode
& AGPSTAT_MODE_3_0
)
379 info
->mode
= bridge
->mode
& ~AGP3_RESERVED_MASK
;
381 info
->mode
= bridge
->mode
& ~AGP2_RESERVED_MASK
;
382 info
->aper_base
= bridge
->gart_bus_addr
;
383 info
->aper_size
= agp_return_size();
384 info
->max_memory
= bridge
->max_memory_agp
;
385 info
->current_memory
= atomic_read(&bridge
->current_memory_agp
);
386 info
->cant_use_aperture
= bridge
->driver
->cant_use_aperture
;
387 info
->vm_ops
= bridge
->vm_ops
;
388 info
->page_mask
= ~0UL;
391 EXPORT_SYMBOL(agp_copy_info
);
393 /* End - Routine to copy over information structure */
396 * Routines for handling swapping of agp_memory into the GATT -
397 * These routines take agp_memory and insert them into the GATT.
398 * They call device specific routines to actually write to the GATT.
402 * agp_bind_memory - Bind an agp_memory structure into the GATT.
404 * @curr: agp_memory pointer
405 * @pg_start: an offset into the graphics aperture translation table
407 * It returns -EINVAL if the pointer == NULL.
408 * It returns -EBUSY if the area of the table requested is already in use.
410 int agp_bind_memory(struct agp_memory
*curr
, off_t pg_start
)
417 if (curr
->is_bound
) {
418 printk(KERN_INFO PFX
"memory %p is already bound!\n", curr
);
421 if (!curr
->is_flushed
) {
422 curr
->bridge
->driver
->cache_flush();
423 curr
->is_flushed
= true;
425 ret_val
= curr
->bridge
->driver
->insert_memory(curr
, pg_start
, curr
->type
);
430 curr
->is_bound
= true;
431 curr
->pg_start
= pg_start
;
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;
466 EXPORT_SYMBOL(agp_unbind_memory
);
468 /* End - Routines for handling swapping of agp_memory into the GATT */
471 /* Generic Agp routines - Start */
472 static void agp_v2_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
476 if (*requested_mode
& AGP2_RESERVED_MASK
) {
477 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
478 *requested_mode
& AGP2_RESERVED_MASK
, *requested_mode
);
479 *requested_mode
&= ~AGP2_RESERVED_MASK
;
483 * Some dumb bridges are programmed to disobey the AGP2 spec.
484 * This is likely a BIOS misprogramming rather than poweron default, or
485 * it would be a lot more common.
486 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
487 * AGPv2 spec 6.1.9 states:
488 * The RATE field indicates the data transfer rates supported by this
489 * device. A.G.P. devices must report all that apply.
490 * Fix them up as best we can.
492 switch (*bridge_agpstat
& 7) {
494 *bridge_agpstat
|= (AGPSTAT2_2X
| AGPSTAT2_1X
);
495 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x4 rate"
496 "Fixing up support for x2 & x1\n");
499 *bridge_agpstat
|= AGPSTAT2_1X
;
500 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x2 rate"
501 "Fixing up support for x1\n");
507 /* Check the speed bits make sense. Only one should be set. */
508 tmp
= *requested_mode
& 7;
511 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to x1 mode.\n", current
->comm
);
512 *requested_mode
|= AGPSTAT2_1X
;
518 *requested_mode
&= ~(AGPSTAT2_1X
); /* rate=2 */
525 *requested_mode
&= ~(AGPSTAT2_1X
|AGPSTAT2_2X
); /* rate=4*/
529 /* disable SBA if it's not supported */
530 if (!((*bridge_agpstat
& AGPSTAT_SBA
) && (*vga_agpstat
& AGPSTAT_SBA
) && (*requested_mode
& AGPSTAT_SBA
)))
531 *bridge_agpstat
&= ~AGPSTAT_SBA
;
534 if (!((*bridge_agpstat
& AGPSTAT2_4X
) && (*vga_agpstat
& AGPSTAT2_4X
) && (*requested_mode
& AGPSTAT2_4X
)))
535 *bridge_agpstat
&= ~AGPSTAT2_4X
;
537 if (!((*bridge_agpstat
& AGPSTAT2_2X
) && (*vga_agpstat
& AGPSTAT2_2X
) && (*requested_mode
& AGPSTAT2_2X
)))
538 *bridge_agpstat
&= ~AGPSTAT2_2X
;
540 if (!((*bridge_agpstat
& AGPSTAT2_1X
) && (*vga_agpstat
& AGPSTAT2_1X
) && (*requested_mode
& AGPSTAT2_1X
)))
541 *bridge_agpstat
&= ~AGPSTAT2_1X
;
543 /* Now we know what mode it should be, clear out the unwanted bits. */
544 if (*bridge_agpstat
& AGPSTAT2_4X
)
545 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_2X
); /* 4X */
547 if (*bridge_agpstat
& AGPSTAT2_2X
)
548 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_4X
); /* 2X */
550 if (*bridge_agpstat
& AGPSTAT2_1X
)
551 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
); /* 1X */
553 /* Apply any errata. */
554 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
555 *bridge_agpstat
&= ~AGPSTAT_FW
;
557 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
558 *bridge_agpstat
&= ~AGPSTAT_SBA
;
560 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
561 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
562 *bridge_agpstat
|= AGPSTAT2_1X
;
565 /* If we've dropped down to 1X, disable fast writes. */
566 if (*bridge_agpstat
& AGPSTAT2_1X
)
567 *bridge_agpstat
&= ~AGPSTAT_FW
;
571 * requested_mode = Mode requested by (typically) X.
572 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
573 * vga_agpstat = PCI_AGP_STATUS from graphic card.
575 static void agp_v3_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
577 u32 origbridge
=*bridge_agpstat
, origvga
=*vga_agpstat
;
580 if (*requested_mode
& AGP3_RESERVED_MASK
) {
581 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
582 *requested_mode
& AGP3_RESERVED_MASK
, *requested_mode
);
583 *requested_mode
&= ~AGP3_RESERVED_MASK
;
586 /* Check the speed bits make sense. */
587 tmp
= *requested_mode
& 7;
589 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current
->comm
);
590 *requested_mode
|= AGPSTAT3_4X
;
593 printk(KERN_INFO PFX
"%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current
->comm
, tmp
* 4);
594 *requested_mode
= (*requested_mode
& ~7) | AGPSTAT3_8X
;
597 /* ARQSZ - Set the value to the maximum one.
598 * Don't allow the mode register to override values. */
599 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_ARQSZ
) |
600 max_t(u32
,(*bridge_agpstat
& AGPSTAT_ARQSZ
),(*vga_agpstat
& AGPSTAT_ARQSZ
)));
602 /* Calibration cycle.
603 * Don't allow the mode register to override values. */
604 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_CAL_MASK
) |
605 min_t(u32
,(*bridge_agpstat
& AGPSTAT_CAL_MASK
),(*vga_agpstat
& AGPSTAT_CAL_MASK
)));
607 /* SBA *must* be supported for AGP v3 */
608 *bridge_agpstat
|= AGPSTAT_SBA
;
612 * Check for invalid speeds. This can happen when applications
613 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
615 if (*requested_mode
& AGPSTAT_MODE_3_0
) {
617 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
618 * have been passed a 3.0 mode, but with 2.x speed bits set.
619 * AGP2.x 4x -> AGP3.0 4x.
621 if (*requested_mode
& AGPSTAT2_4X
) {
622 printk(KERN_INFO PFX
"%s passes broken AGP3 flags (%x). Fixed.\n",
623 current
->comm
, *requested_mode
);
624 *requested_mode
&= ~AGPSTAT2_4X
;
625 *requested_mode
|= AGPSTAT3_4X
;
629 * The caller doesn't know what they are doing. We are in 3.0 mode,
630 * but have been passed an AGP 2.x mode.
631 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
633 printk(KERN_INFO PFX
"%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
634 current
->comm
, *requested_mode
);
635 *requested_mode
&= ~(AGPSTAT2_4X
| AGPSTAT2_2X
| AGPSTAT2_1X
);
636 *requested_mode
|= AGPSTAT3_4X
;
639 if (*requested_mode
& AGPSTAT3_8X
) {
640 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
641 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
642 *bridge_agpstat
|= AGPSTAT3_4X
;
643 printk(KERN_INFO PFX
"%s requested AGPx8 but bridge not capable.\n", current
->comm
);
646 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
647 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
648 *bridge_agpstat
|= AGPSTAT3_4X
;
649 printk(KERN_INFO PFX
"%s requested AGPx8 but graphic card not capable.\n", current
->comm
);
652 /* All set, bridge & device can do AGP x8*/
653 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
656 } else if (*requested_mode
& AGPSTAT3_4X
) {
657 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
658 *bridge_agpstat
|= AGPSTAT3_4X
;
664 * If we didn't specify an AGP mode, we see if both
665 * the graphics card, and the bridge can do x8, and use if so.
666 * If not, we fall back to x4 mode.
668 if ((*bridge_agpstat
& AGPSTAT3_8X
) && (*vga_agpstat
& AGPSTAT3_8X
)) {
669 printk(KERN_INFO PFX
"No AGP mode specified. Setting to highest mode "
670 "supported by bridge & card (x8).\n");
671 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
672 *vga_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
674 printk(KERN_INFO PFX
"Fell back to AGPx4 mode because");
675 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
676 printk(KERN_INFO PFX
"bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
677 *bridge_agpstat
, origbridge
);
678 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
679 *bridge_agpstat
|= AGPSTAT3_4X
;
681 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
682 printk(KERN_INFO PFX
"graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
683 *vga_agpstat
, origvga
);
684 *vga_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
685 *vga_agpstat
|= AGPSTAT3_4X
;
691 /* Apply any errata. */
692 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
693 *bridge_agpstat
&= ~AGPSTAT_FW
;
695 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
696 *bridge_agpstat
&= ~AGPSTAT_SBA
;
698 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
699 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
700 *bridge_agpstat
|= AGPSTAT2_1X
;
706 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
707 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
708 * @requested_mode: requested agp_stat from userspace (Typically from X)
709 * @bridge_agpstat: current agp_stat from AGP bridge.
711 * This function will hunt for an AGP graphics card, and try to match
712 * the requested mode to the capabilities of both the bridge and the card.
714 u32
agp_collect_device_status(struct agp_bridge_data
*bridge
, u32 requested_mode
, u32 bridge_agpstat
)
716 struct pci_dev
*device
= NULL
;
721 device
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, device
);
723 printk(KERN_INFO PFX
"Couldn't find an AGP VGA controller.\n");
726 cap_ptr
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
732 * Ok, here we have a AGP device. Disable impossible
733 * settings, and adjust the readqueue to the minimum.
735 pci_read_config_dword(device
, cap_ptr
+PCI_AGP_STATUS
, &vga_agpstat
);
737 /* adjust RQ depth */
738 bridge_agpstat
= ((bridge_agpstat
& ~AGPSTAT_RQ_DEPTH
) |
739 min_t(u32
, (requested_mode
& AGPSTAT_RQ_DEPTH
),
740 min_t(u32
, (bridge_agpstat
& AGPSTAT_RQ_DEPTH
), (vga_agpstat
& AGPSTAT_RQ_DEPTH
))));
742 /* disable FW if it's not supported */
743 if (!((bridge_agpstat
& AGPSTAT_FW
) &&
744 (vga_agpstat
& AGPSTAT_FW
) &&
745 (requested_mode
& AGPSTAT_FW
)))
746 bridge_agpstat
&= ~AGPSTAT_FW
;
748 /* Check to see if we are operating in 3.0 mode */
749 if (agp_bridge
->mode
& AGPSTAT_MODE_3_0
)
750 agp_v3_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
752 agp_v2_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
755 return bridge_agpstat
;
757 EXPORT_SYMBOL(agp_collect_device_status
);
760 void agp_device_command(u32 bridge_agpstat
, bool agp_v3
)
762 struct pci_dev
*device
= NULL
;
765 mode
= bridge_agpstat
& 0x7;
769 for_each_pci_dev(device
) {
770 u8 agp
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
774 printk(KERN_INFO PFX
"Putting AGP V%d device at %s into %dx mode\n",
775 agp_v3
? 3 : 2, pci_name(device
), mode
);
776 pci_write_config_dword(device
, agp
+ PCI_AGP_COMMAND
, bridge_agpstat
);
779 EXPORT_SYMBOL(agp_device_command
);
782 void get_agp_version(struct agp_bridge_data
*bridge
)
786 /* Exit early if already set by errata workarounds. */
787 if (bridge
->major_version
!= 0)
790 pci_read_config_dword(bridge
->dev
, bridge
->capndx
, &ncapid
);
791 bridge
->major_version
= (ncapid
>> AGP_MAJOR_VERSION_SHIFT
) & 0xf;
792 bridge
->minor_version
= (ncapid
>> AGP_MINOR_VERSION_SHIFT
) & 0xf;
794 EXPORT_SYMBOL(get_agp_version
);
797 void agp_generic_enable(struct agp_bridge_data
*bridge
, u32 requested_mode
)
799 u32 bridge_agpstat
, temp
;
801 get_agp_version(agp_bridge
);
803 printk(KERN_INFO PFX
"Found an AGP %d.%d compliant device at %s.\n",
804 agp_bridge
->major_version
,
805 agp_bridge
->minor_version
,
806 pci_name(agp_bridge
->dev
));
808 pci_read_config_dword(agp_bridge
->dev
,
809 agp_bridge
->capndx
+ PCI_AGP_STATUS
, &bridge_agpstat
);
811 bridge_agpstat
= agp_collect_device_status(agp_bridge
, requested_mode
, bridge_agpstat
);
812 if (bridge_agpstat
== 0)
813 /* Something bad happened. FIXME: Return error code? */
816 bridge_agpstat
|= AGPSTAT_AGP_ENABLE
;
818 /* Do AGP version specific frobbing. */
819 if (bridge
->major_version
>= 3) {
820 if (bridge
->mode
& AGPSTAT_MODE_3_0
) {
821 /* If we have 3.5, we can do the isoch stuff. */
822 if (bridge
->minor_version
>= 5)
823 agp_3_5_enable(bridge
);
824 agp_device_command(bridge_agpstat
, true);
827 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
828 bridge_agpstat
&= ~(7<<10) ;
829 pci_read_config_dword(bridge
->dev
,
830 bridge
->capndx
+AGPCTRL
, &temp
);
832 pci_write_config_dword(bridge
->dev
,
833 bridge
->capndx
+AGPCTRL
, temp
);
835 printk(KERN_INFO PFX
"Device is in legacy mode,"
836 " falling back to 2.x\n");
841 agp_device_command(bridge_agpstat
, false);
843 EXPORT_SYMBOL(agp_generic_enable
);
846 int agp_generic_create_gatt_table(struct agp_bridge_data
*bridge
)
857 /* The generic routines can't handle 2 level gatt's */
858 if (bridge
->driver
->size_type
== LVL2_APER_SIZE
)
862 i
= bridge
->aperture_size_idx
;
863 temp
= bridge
->current_size
;
864 size
= page_order
= num_entries
= 0;
866 if (bridge
->driver
->size_type
!= FIXED_APER_SIZE
) {
868 switch (bridge
->driver
->size_type
) {
870 size
= A_SIZE_8(temp
)->size
;
872 A_SIZE_8(temp
)->page_order
;
874 A_SIZE_8(temp
)->num_entries
;
877 size
= A_SIZE_16(temp
)->size
;
878 page_order
= A_SIZE_16(temp
)->page_order
;
879 num_entries
= A_SIZE_16(temp
)->num_entries
;
882 size
= A_SIZE_32(temp
)->size
;
883 page_order
= A_SIZE_32(temp
)->page_order
;
884 num_entries
= A_SIZE_32(temp
)->num_entries
;
886 /* This case will never really happen. */
887 case FIXED_APER_SIZE
:
890 size
= page_order
= num_entries
= 0;
894 table
= alloc_gatt_pages(page_order
);
898 switch (bridge
->driver
->size_type
) {
900 bridge
->current_size
= A_IDX8(bridge
);
903 bridge
->current_size
= A_IDX16(bridge
);
906 bridge
->current_size
= A_IDX32(bridge
);
908 /* These cases will never really happen. */
909 case FIXED_APER_SIZE
:
914 temp
= bridge
->current_size
;
916 bridge
->aperture_size_idx
= i
;
918 } while (!table
&& (i
< bridge
->driver
->num_aperture_sizes
));
920 size
= ((struct aper_size_info_fixed
*) temp
)->size
;
921 page_order
= ((struct aper_size_info_fixed
*) temp
)->page_order
;
922 num_entries
= ((struct aper_size_info_fixed
*) temp
)->num_entries
;
923 table
= alloc_gatt_pages(page_order
);
929 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
931 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
932 SetPageReserved(page
);
934 bridge
->gatt_table_real
= (u32
*) table
;
935 agp_gatt_table
= (void *)table
;
937 bridge
->driver
->cache_flush();
939 set_memory_uc((unsigned long)table
, 1 << page_order
);
940 bridge
->gatt_table
= (void *)table
;
942 bridge
->gatt_table
= ioremap_nocache(virt_to_gart(table
),
943 (PAGE_SIZE
* (1 << page_order
)));
944 bridge
->driver
->cache_flush();
947 if (bridge
->gatt_table
== NULL
) {
948 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
949 ClearPageReserved(page
);
951 free_gatt_pages(table
, page_order
);
955 bridge
->gatt_bus_addr
= virt_to_gart(bridge
->gatt_table_real
);
957 /* AK: bogus, should encode addresses > 4GB */
958 for (i
= 0; i
< num_entries
; i
++) {
959 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
960 readl(bridge
->gatt_table
+i
); /* PCI Posting. */
965 EXPORT_SYMBOL(agp_generic_create_gatt_table
);
967 int agp_generic_free_gatt_table(struct agp_bridge_data
*bridge
)
970 char *table
, *table_end
;
974 temp
= bridge
->current_size
;
976 switch (bridge
->driver
->size_type
) {
978 page_order
= A_SIZE_8(temp
)->page_order
;
981 page_order
= A_SIZE_16(temp
)->page_order
;
984 page_order
= A_SIZE_32(temp
)->page_order
;
986 case FIXED_APER_SIZE
:
987 page_order
= A_SIZE_FIX(temp
)->page_order
;
990 /* The generic routines can't deal with 2 level gatt's */
998 /* Do not worry about freeing memory, because if this is
999 * called, then all agp memory is deallocated and removed
1000 * from the table. */
1003 set_memory_wb((unsigned long)bridge
->gatt_table
, 1 << page_order
);
1005 iounmap(bridge
->gatt_table
);
1007 table
= (char *) bridge
->gatt_table_real
;
1008 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
1010 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
1011 ClearPageReserved(page
);
1013 free_gatt_pages(bridge
->gatt_table_real
, page_order
);
1015 agp_gatt_table
= NULL
;
1016 bridge
->gatt_table
= NULL
;
1017 bridge
->gatt_table_real
= NULL
;
1018 bridge
->gatt_bus_addr
= 0;
1022 EXPORT_SYMBOL(agp_generic_free_gatt_table
);
1025 int agp_generic_insert_memory(struct agp_memory
* mem
, off_t pg_start
, int type
)
1031 struct agp_bridge_data
*bridge
;
1034 bridge
= mem
->bridge
;
1038 if (mem
->page_count
== 0)
1041 temp
= bridge
->current_size
;
1043 switch (bridge
->driver
->size_type
) {
1045 num_entries
= A_SIZE_8(temp
)->num_entries
;
1048 num_entries
= A_SIZE_16(temp
)->num_entries
;
1051 num_entries
= A_SIZE_32(temp
)->num_entries
;
1053 case FIXED_APER_SIZE
:
1054 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
1056 case LVL2_APER_SIZE
:
1057 /* The generic routines can't deal with 2 level gatt's */
1065 num_entries
-= agp_memory_reserved
/PAGE_SIZE
;
1066 if (num_entries
< 0) num_entries
= 0;
1068 if (type
!= mem
->type
)
1071 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1072 if (mask_type
!= 0) {
1073 /* The generic routines know nothing of memory types */
1077 /* AK: could wrap */
1078 if ((pg_start
+ mem
->page_count
) > num_entries
)
1083 while (j
< (pg_start
+ mem
->page_count
)) {
1084 if (!PGE_EMPTY(bridge
, readl(bridge
->gatt_table
+j
)))
1089 if (!mem
->is_flushed
) {
1090 bridge
->driver
->cache_flush();
1091 mem
->is_flushed
= true;
1094 for (i
= 0, j
= pg_start
; i
< mem
->page_count
; i
++, j
++) {
1095 writel(bridge
->driver
->mask_memory(bridge
, mem
->memory
[i
], mask_type
),
1096 bridge
->gatt_table
+j
);
1098 readl(bridge
->gatt_table
+j
-1); /* PCI Posting. */
1100 bridge
->driver
->tlb_flush(mem
);
1103 EXPORT_SYMBOL(agp_generic_insert_memory
);
1106 int agp_generic_remove_memory(struct agp_memory
*mem
, off_t pg_start
, int type
)
1109 struct agp_bridge_data
*bridge
;
1112 bridge
= mem
->bridge
;
1116 if (mem
->page_count
== 0)
1119 if (type
!= mem
->type
)
1122 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1123 if (mask_type
!= 0) {
1124 /* The generic routines know nothing of memory types */
1128 /* AK: bogus, should encode addresses > 4GB */
1129 for (i
= pg_start
; i
< (mem
->page_count
+ pg_start
); i
++) {
1130 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
1132 readl(bridge
->gatt_table
+i
-1); /* PCI Posting. */
1134 bridge
->driver
->tlb_flush(mem
);
1137 EXPORT_SYMBOL(agp_generic_remove_memory
);
1139 struct agp_memory
*agp_generic_alloc_by_type(size_t page_count
, int type
)
1143 EXPORT_SYMBOL(agp_generic_alloc_by_type
);
1145 void agp_generic_free_by_type(struct agp_memory
*curr
)
1147 agp_free_page_array(curr
);
1148 agp_free_key(curr
->key
);
1151 EXPORT_SYMBOL(agp_generic_free_by_type
);
1153 struct agp_memory
*agp_generic_alloc_user(size_t page_count
, int type
)
1155 struct agp_memory
*new;
1159 pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
1160 new = agp_create_user_memory(page_count
);
1164 for (i
= 0; i
< page_count
; i
++)
1166 new->page_count
= 0;
1168 new->num_scratch_pages
= pages
;
1172 EXPORT_SYMBOL(agp_generic_alloc_user
);
1175 * Basic Page Allocation Routines -
1176 * These routines handle page allocation and by default they reserve the allocated
1177 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1178 * against a maximum value.
1181 void *agp_generic_alloc_page(struct agp_bridge_data
*bridge
)
1185 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
);
1189 map_page_into_agp(page
);
1192 atomic_inc(&agp_bridge
->current_memory_agp
);
1193 return page_address(page
);
1195 EXPORT_SYMBOL(agp_generic_alloc_page
);
1198 void agp_generic_destroy_page(void *addr
, int flags
)
1205 page
= virt_to_page(addr
);
1206 if (flags
& AGP_PAGE_DESTROY_UNMAP
)
1207 unmap_page_from_agp(page
);
1209 if (flags
& AGP_PAGE_DESTROY_FREE
) {
1211 free_page((unsigned long)addr
);
1212 atomic_dec(&agp_bridge
->current_memory_agp
);
1215 EXPORT_SYMBOL(agp_generic_destroy_page
);
1217 /* End Basic Page Allocation Routines */
1221 * agp_enable - initialise the agp point-to-point connection.
1223 * @mode: agp mode register value to configure with.
1225 void agp_enable(struct agp_bridge_data
*bridge
, u32 mode
)
1229 bridge
->driver
->agp_enable(bridge
, mode
);
1231 EXPORT_SYMBOL(agp_enable
);
1233 /* When we remove the global variable agp_bridge from all drivers
1234 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1237 struct agp_bridge_data
*agp_generic_find_bridge(struct pci_dev
*pdev
)
1239 if (list_empty(&agp_bridges
))
1245 static void ipi_handler(void *null
)
1250 void global_cache_flush(void)
1252 if (on_each_cpu(ipi_handler
, NULL
, 1, 1) != 0)
1253 panic(PFX
"timed out waiting for the other CPUs!\n");
1255 EXPORT_SYMBOL(global_cache_flush
);
1257 unsigned long agp_generic_mask_memory(struct agp_bridge_data
*bridge
,
1258 unsigned long addr
, int type
)
1260 /* memory type is ignored in the generic routine */
1261 if (bridge
->driver
->masks
)
1262 return addr
| bridge
->driver
->masks
[0].mask
;
1266 EXPORT_SYMBOL(agp_generic_mask_memory
);
1268 int agp_generic_type_to_mask_type(struct agp_bridge_data
*bridge
,
1271 if (type
>= AGP_USER_TYPES
)
1275 EXPORT_SYMBOL(agp_generic_type_to_mask_type
);
1278 * These functions are implemented according to the AGPv3 spec,
1279 * which covers implementation details that had previously been
1283 int agp3_generic_fetch_size(void)
1287 struct aper_size_info_16
*values
;
1289 pci_read_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, &temp_size
);
1290 values
= A_SIZE_16(agp_bridge
->driver
->aperture_sizes
);
1292 for (i
= 0; i
< agp_bridge
->driver
->num_aperture_sizes
; i
++) {
1293 if (temp_size
== values
[i
].size_value
) {
1294 agp_bridge
->previous_size
=
1295 agp_bridge
->current_size
= (void *) (values
+ i
);
1297 agp_bridge
->aperture_size_idx
= i
;
1298 return values
[i
].size
;
1303 EXPORT_SYMBOL(agp3_generic_fetch_size
);
1305 void agp3_generic_tlbflush(struct agp_memory
*mem
)
1308 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1309 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_GTLBEN
);
1310 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
);
1312 EXPORT_SYMBOL(agp3_generic_tlbflush
);
1314 int agp3_generic_configure(void)
1317 struct aper_size_info_16
*current_size
;
1319 current_size
= A_SIZE_16(agp_bridge
->current_size
);
1321 pci_read_config_dword(agp_bridge
->dev
, AGP_APBASE
, &temp
);
1322 agp_bridge
->gart_bus_addr
= (temp
& PCI_BASE_ADDRESS_MEM_MASK
);
1324 /* set aperture size */
1325 pci_write_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, current_size
->size_value
);
1326 /* set gart pointer */
1327 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPGARTLO
, agp_bridge
->gatt_bus_addr
);
1328 /* enable aperture and GTLB */
1329 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &temp
);
1330 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, temp
| AGPCTRL_APERENB
| AGPCTRL_GTLBEN
);
1333 EXPORT_SYMBOL(agp3_generic_configure
);
1335 void agp3_generic_cleanup(void)
1338 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1339 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_APERENB
);
1341 EXPORT_SYMBOL(agp3_generic_cleanup
);
1343 const struct aper_size_info_16 agp3_generic_sizes
[AGP_GENERIC_SIZES_ENTRIES
] =
1345 {4096, 1048576, 10,0x000},
1346 {2048, 524288, 9, 0x800},
1347 {1024, 262144, 8, 0xc00},
1348 { 512, 131072, 7, 0xe00},
1349 { 256, 65536, 6, 0xf00},
1350 { 128, 32768, 5, 0xf20},
1351 { 64, 16384, 4, 0xf30},
1352 { 32, 8192, 3, 0xf38},
1353 { 16, 4096, 2, 0xf3c},
1354 { 8, 2048, 1, 0xf3e},
1355 { 4, 1024, 0, 0xf3f}
1357 EXPORT_SYMBOL(agp3_generic_sizes
);