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
;
432 spin_lock(&agp_bridge
->mapped_lock
);
433 list_add(&curr
->mapped_list
, &agp_bridge
->mapped_list
);
434 spin_unlock(&agp_bridge
->mapped_lock
);
438 EXPORT_SYMBOL(agp_bind_memory
);
442 * agp_unbind_memory - Removes an agp_memory structure from the GATT
444 * @curr: agp_memory pointer to be removed from the GATT.
446 * It returns -EINVAL if this piece of agp_memory is not currently bound to
447 * the graphics aperture translation table or if the agp_memory pointer == NULL
449 int agp_unbind_memory(struct agp_memory
*curr
)
456 if (!curr
->is_bound
) {
457 printk(KERN_INFO PFX
"memory %p was not bound!\n", curr
);
461 ret_val
= curr
->bridge
->driver
->remove_memory(curr
, curr
->pg_start
, curr
->type
);
466 curr
->is_bound
= false;
468 spin_lock(&curr
->bridge
->mapped_lock
);
469 list_del(&curr
->mapped_list
);
470 spin_unlock(&curr
->bridge
->mapped_lock
);
473 EXPORT_SYMBOL(agp_unbind_memory
);
476 * agp_rebind_emmory - Rewrite the entire GATT, useful on resume
478 int agp_rebind_memory(void)
480 struct agp_memory
*curr
;
483 spin_lock(&agp_bridge
->mapped_lock
);
484 list_for_each_entry(curr
, &agp_bridge
->mapped_list
, mapped_list
) {
485 ret_val
= curr
->bridge
->driver
->insert_memory(curr
,
491 spin_unlock(&agp_bridge
->mapped_lock
);
494 EXPORT_SYMBOL(agp_rebind_memory
);
496 /* End - Routines for handling swapping of agp_memory into the GATT */
499 /* Generic Agp routines - Start */
500 static void agp_v2_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
504 if (*requested_mode
& AGP2_RESERVED_MASK
) {
505 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
506 *requested_mode
& AGP2_RESERVED_MASK
, *requested_mode
);
507 *requested_mode
&= ~AGP2_RESERVED_MASK
;
511 * Some dumb bridges are programmed to disobey the AGP2 spec.
512 * This is likely a BIOS misprogramming rather than poweron default, or
513 * it would be a lot more common.
514 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
515 * AGPv2 spec 6.1.9 states:
516 * The RATE field indicates the data transfer rates supported by this
517 * device. A.G.P. devices must report all that apply.
518 * Fix them up as best we can.
520 switch (*bridge_agpstat
& 7) {
522 *bridge_agpstat
|= (AGPSTAT2_2X
| AGPSTAT2_1X
);
523 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x4 rate"
524 "Fixing up support for x2 & x1\n");
527 *bridge_agpstat
|= AGPSTAT2_1X
;
528 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x2 rate"
529 "Fixing up support for x1\n");
535 /* Check the speed bits make sense. Only one should be set. */
536 tmp
= *requested_mode
& 7;
539 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to x1 mode.\n", current
->comm
);
540 *requested_mode
|= AGPSTAT2_1X
;
546 *requested_mode
&= ~(AGPSTAT2_1X
); /* rate=2 */
553 *requested_mode
&= ~(AGPSTAT2_1X
|AGPSTAT2_2X
); /* rate=4*/
557 /* disable SBA if it's not supported */
558 if (!((*bridge_agpstat
& AGPSTAT_SBA
) && (*vga_agpstat
& AGPSTAT_SBA
) && (*requested_mode
& AGPSTAT_SBA
)))
559 *bridge_agpstat
&= ~AGPSTAT_SBA
;
562 if (!((*bridge_agpstat
& AGPSTAT2_4X
) && (*vga_agpstat
& AGPSTAT2_4X
) && (*requested_mode
& AGPSTAT2_4X
)))
563 *bridge_agpstat
&= ~AGPSTAT2_4X
;
565 if (!((*bridge_agpstat
& AGPSTAT2_2X
) && (*vga_agpstat
& AGPSTAT2_2X
) && (*requested_mode
& AGPSTAT2_2X
)))
566 *bridge_agpstat
&= ~AGPSTAT2_2X
;
568 if (!((*bridge_agpstat
& AGPSTAT2_1X
) && (*vga_agpstat
& AGPSTAT2_1X
) && (*requested_mode
& AGPSTAT2_1X
)))
569 *bridge_agpstat
&= ~AGPSTAT2_1X
;
571 /* Now we know what mode it should be, clear out the unwanted bits. */
572 if (*bridge_agpstat
& AGPSTAT2_4X
)
573 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_2X
); /* 4X */
575 if (*bridge_agpstat
& AGPSTAT2_2X
)
576 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_4X
); /* 2X */
578 if (*bridge_agpstat
& AGPSTAT2_1X
)
579 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
); /* 1X */
581 /* Apply any errata. */
582 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
583 *bridge_agpstat
&= ~AGPSTAT_FW
;
585 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
586 *bridge_agpstat
&= ~AGPSTAT_SBA
;
588 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
589 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
590 *bridge_agpstat
|= AGPSTAT2_1X
;
593 /* If we've dropped down to 1X, disable fast writes. */
594 if (*bridge_agpstat
& AGPSTAT2_1X
)
595 *bridge_agpstat
&= ~AGPSTAT_FW
;
599 * requested_mode = Mode requested by (typically) X.
600 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
601 * vga_agpstat = PCI_AGP_STATUS from graphic card.
603 static void agp_v3_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
605 u32 origbridge
=*bridge_agpstat
, origvga
=*vga_agpstat
;
608 if (*requested_mode
& AGP3_RESERVED_MASK
) {
609 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
610 *requested_mode
& AGP3_RESERVED_MASK
, *requested_mode
);
611 *requested_mode
&= ~AGP3_RESERVED_MASK
;
614 /* Check the speed bits make sense. */
615 tmp
= *requested_mode
& 7;
617 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current
->comm
);
618 *requested_mode
|= AGPSTAT3_4X
;
621 printk(KERN_INFO PFX
"%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current
->comm
, tmp
* 4);
622 *requested_mode
= (*requested_mode
& ~7) | AGPSTAT3_8X
;
625 /* ARQSZ - Set the value to the maximum one.
626 * Don't allow the mode register to override values. */
627 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_ARQSZ
) |
628 max_t(u32
,(*bridge_agpstat
& AGPSTAT_ARQSZ
),(*vga_agpstat
& AGPSTAT_ARQSZ
)));
630 /* Calibration cycle.
631 * Don't allow the mode register to override values. */
632 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_CAL_MASK
) |
633 min_t(u32
,(*bridge_agpstat
& AGPSTAT_CAL_MASK
),(*vga_agpstat
& AGPSTAT_CAL_MASK
)));
635 /* SBA *must* be supported for AGP v3 */
636 *bridge_agpstat
|= AGPSTAT_SBA
;
640 * Check for invalid speeds. This can happen when applications
641 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
643 if (*requested_mode
& AGPSTAT_MODE_3_0
) {
645 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
646 * have been passed a 3.0 mode, but with 2.x speed bits set.
647 * AGP2.x 4x -> AGP3.0 4x.
649 if (*requested_mode
& AGPSTAT2_4X
) {
650 printk(KERN_INFO PFX
"%s passes broken AGP3 flags (%x). Fixed.\n",
651 current
->comm
, *requested_mode
);
652 *requested_mode
&= ~AGPSTAT2_4X
;
653 *requested_mode
|= AGPSTAT3_4X
;
657 * The caller doesn't know what they are doing. We are in 3.0 mode,
658 * but have been passed an AGP 2.x mode.
659 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
661 printk(KERN_INFO PFX
"%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
662 current
->comm
, *requested_mode
);
663 *requested_mode
&= ~(AGPSTAT2_4X
| AGPSTAT2_2X
| AGPSTAT2_1X
);
664 *requested_mode
|= AGPSTAT3_4X
;
667 if (*requested_mode
& AGPSTAT3_8X
) {
668 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
669 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
670 *bridge_agpstat
|= AGPSTAT3_4X
;
671 printk(KERN_INFO PFX
"%s requested AGPx8 but bridge not capable.\n", current
->comm
);
674 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
675 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
676 *bridge_agpstat
|= AGPSTAT3_4X
;
677 printk(KERN_INFO PFX
"%s requested AGPx8 but graphic card not capable.\n", current
->comm
);
680 /* All set, bridge & device can do AGP x8*/
681 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
684 } else if (*requested_mode
& AGPSTAT3_4X
) {
685 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
686 *bridge_agpstat
|= AGPSTAT3_4X
;
692 * If we didn't specify an AGP mode, we see if both
693 * the graphics card, and the bridge can do x8, and use if so.
694 * If not, we fall back to x4 mode.
696 if ((*bridge_agpstat
& AGPSTAT3_8X
) && (*vga_agpstat
& AGPSTAT3_8X
)) {
697 printk(KERN_INFO PFX
"No AGP mode specified. Setting to highest mode "
698 "supported by bridge & card (x8).\n");
699 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
700 *vga_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
702 printk(KERN_INFO PFX
"Fell back to AGPx4 mode because");
703 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
704 printk(KERN_INFO PFX
"bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
705 *bridge_agpstat
, origbridge
);
706 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
707 *bridge_agpstat
|= AGPSTAT3_4X
;
709 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
710 printk(KERN_INFO PFX
"graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
711 *vga_agpstat
, origvga
);
712 *vga_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
713 *vga_agpstat
|= AGPSTAT3_4X
;
719 /* Apply any errata. */
720 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
721 *bridge_agpstat
&= ~AGPSTAT_FW
;
723 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
724 *bridge_agpstat
&= ~AGPSTAT_SBA
;
726 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
727 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
728 *bridge_agpstat
|= AGPSTAT2_1X
;
734 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
735 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
736 * @requested_mode: requested agp_stat from userspace (Typically from X)
737 * @bridge_agpstat: current agp_stat from AGP bridge.
739 * This function will hunt for an AGP graphics card, and try to match
740 * the requested mode to the capabilities of both the bridge and the card.
742 u32
agp_collect_device_status(struct agp_bridge_data
*bridge
, u32 requested_mode
, u32 bridge_agpstat
)
744 struct pci_dev
*device
= NULL
;
749 device
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, device
);
751 printk(KERN_INFO PFX
"Couldn't find an AGP VGA controller.\n");
754 cap_ptr
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
760 * Ok, here we have a AGP device. Disable impossible
761 * settings, and adjust the readqueue to the minimum.
763 pci_read_config_dword(device
, cap_ptr
+PCI_AGP_STATUS
, &vga_agpstat
);
765 /* adjust RQ depth */
766 bridge_agpstat
= ((bridge_agpstat
& ~AGPSTAT_RQ_DEPTH
) |
767 min_t(u32
, (requested_mode
& AGPSTAT_RQ_DEPTH
),
768 min_t(u32
, (bridge_agpstat
& AGPSTAT_RQ_DEPTH
), (vga_agpstat
& AGPSTAT_RQ_DEPTH
))));
770 /* disable FW if it's not supported */
771 if (!((bridge_agpstat
& AGPSTAT_FW
) &&
772 (vga_agpstat
& AGPSTAT_FW
) &&
773 (requested_mode
& AGPSTAT_FW
)))
774 bridge_agpstat
&= ~AGPSTAT_FW
;
776 /* Check to see if we are operating in 3.0 mode */
777 if (agp_bridge
->mode
& AGPSTAT_MODE_3_0
)
778 agp_v3_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
780 agp_v2_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
783 return bridge_agpstat
;
785 EXPORT_SYMBOL(agp_collect_device_status
);
788 void agp_device_command(u32 bridge_agpstat
, bool agp_v3
)
790 struct pci_dev
*device
= NULL
;
793 mode
= bridge_agpstat
& 0x7;
797 for_each_pci_dev(device
) {
798 u8 agp
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
802 dev_info(&device
->dev
, "putting AGP V%d device into %dx mode\n",
803 agp_v3
? 3 : 2, mode
);
804 pci_write_config_dword(device
, agp
+ PCI_AGP_COMMAND
, bridge_agpstat
);
807 EXPORT_SYMBOL(agp_device_command
);
810 void get_agp_version(struct agp_bridge_data
*bridge
)
814 /* Exit early if already set by errata workarounds. */
815 if (bridge
->major_version
!= 0)
818 pci_read_config_dword(bridge
->dev
, bridge
->capndx
, &ncapid
);
819 bridge
->major_version
= (ncapid
>> AGP_MAJOR_VERSION_SHIFT
) & 0xf;
820 bridge
->minor_version
= (ncapid
>> AGP_MINOR_VERSION_SHIFT
) & 0xf;
822 EXPORT_SYMBOL(get_agp_version
);
825 void agp_generic_enable(struct agp_bridge_data
*bridge
, u32 requested_mode
)
827 u32 bridge_agpstat
, temp
;
829 get_agp_version(agp_bridge
);
831 dev_info(&agp_bridge
->dev
->dev
, "AGP %d.%d bridge\n",
832 agp_bridge
->major_version
, agp_bridge
->minor_version
);
834 pci_read_config_dword(agp_bridge
->dev
,
835 agp_bridge
->capndx
+ PCI_AGP_STATUS
, &bridge_agpstat
);
837 bridge_agpstat
= agp_collect_device_status(agp_bridge
, requested_mode
, bridge_agpstat
);
838 if (bridge_agpstat
== 0)
839 /* Something bad happened. FIXME: Return error code? */
842 bridge_agpstat
|= AGPSTAT_AGP_ENABLE
;
844 /* Do AGP version specific frobbing. */
845 if (bridge
->major_version
>= 3) {
846 if (bridge
->mode
& AGPSTAT_MODE_3_0
) {
847 /* If we have 3.5, we can do the isoch stuff. */
848 if (bridge
->minor_version
>= 5)
849 agp_3_5_enable(bridge
);
850 agp_device_command(bridge_agpstat
, true);
853 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
854 bridge_agpstat
&= ~(7<<10) ;
855 pci_read_config_dword(bridge
->dev
,
856 bridge
->capndx
+AGPCTRL
, &temp
);
858 pci_write_config_dword(bridge
->dev
,
859 bridge
->capndx
+AGPCTRL
, temp
);
861 dev_info(&bridge
->dev
->dev
, "bridge is in legacy mode, falling back to 2.x\n");
866 agp_device_command(bridge_agpstat
, false);
868 EXPORT_SYMBOL(agp_generic_enable
);
871 int agp_generic_create_gatt_table(struct agp_bridge_data
*bridge
)
882 /* The generic routines can't handle 2 level gatt's */
883 if (bridge
->driver
->size_type
== LVL2_APER_SIZE
)
887 i
= bridge
->aperture_size_idx
;
888 temp
= bridge
->current_size
;
889 size
= page_order
= num_entries
= 0;
891 if (bridge
->driver
->size_type
!= FIXED_APER_SIZE
) {
893 switch (bridge
->driver
->size_type
) {
895 size
= A_SIZE_8(temp
)->size
;
897 A_SIZE_8(temp
)->page_order
;
899 A_SIZE_8(temp
)->num_entries
;
902 size
= A_SIZE_16(temp
)->size
;
903 page_order
= A_SIZE_16(temp
)->page_order
;
904 num_entries
= A_SIZE_16(temp
)->num_entries
;
907 size
= A_SIZE_32(temp
)->size
;
908 page_order
= A_SIZE_32(temp
)->page_order
;
909 num_entries
= A_SIZE_32(temp
)->num_entries
;
911 /* This case will never really happen. */
912 case FIXED_APER_SIZE
:
915 size
= page_order
= num_entries
= 0;
919 table
= alloc_gatt_pages(page_order
);
923 switch (bridge
->driver
->size_type
) {
925 bridge
->current_size
= A_IDX8(bridge
);
928 bridge
->current_size
= A_IDX16(bridge
);
931 bridge
->current_size
= A_IDX32(bridge
);
933 /* These cases will never really happen. */
934 case FIXED_APER_SIZE
:
939 temp
= bridge
->current_size
;
941 bridge
->aperture_size_idx
= i
;
943 } while (!table
&& (i
< bridge
->driver
->num_aperture_sizes
));
945 size
= ((struct aper_size_info_fixed
*) temp
)->size
;
946 page_order
= ((struct aper_size_info_fixed
*) temp
)->page_order
;
947 num_entries
= ((struct aper_size_info_fixed
*) temp
)->num_entries
;
948 table
= alloc_gatt_pages(page_order
);
954 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
956 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
957 SetPageReserved(page
);
959 bridge
->gatt_table_real
= (u32
*) table
;
960 agp_gatt_table
= (void *)table
;
962 bridge
->driver
->cache_flush();
964 set_memory_uc((unsigned long)table
, 1 << page_order
);
965 bridge
->gatt_table
= (void *)table
;
967 bridge
->gatt_table
= ioremap_nocache(virt_to_gart(table
),
968 (PAGE_SIZE
* (1 << page_order
)));
969 bridge
->driver
->cache_flush();
972 if (bridge
->gatt_table
== NULL
) {
973 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
974 ClearPageReserved(page
);
976 free_gatt_pages(table
, page_order
);
980 bridge
->gatt_bus_addr
= virt_to_gart(bridge
->gatt_table_real
);
982 /* AK: bogus, should encode addresses > 4GB */
983 for (i
= 0; i
< num_entries
; i
++) {
984 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
985 readl(bridge
->gatt_table
+i
); /* PCI Posting. */
990 EXPORT_SYMBOL(agp_generic_create_gatt_table
);
992 int agp_generic_free_gatt_table(struct agp_bridge_data
*bridge
)
995 char *table
, *table_end
;
999 temp
= bridge
->current_size
;
1001 switch (bridge
->driver
->size_type
) {
1003 page_order
= A_SIZE_8(temp
)->page_order
;
1006 page_order
= A_SIZE_16(temp
)->page_order
;
1009 page_order
= A_SIZE_32(temp
)->page_order
;
1011 case FIXED_APER_SIZE
:
1012 page_order
= A_SIZE_FIX(temp
)->page_order
;
1014 case LVL2_APER_SIZE
:
1015 /* The generic routines can't deal with 2 level gatt's */
1023 /* Do not worry about freeing memory, because if this is
1024 * called, then all agp memory is deallocated and removed
1025 * from the table. */
1028 set_memory_wb((unsigned long)bridge
->gatt_table
, 1 << page_order
);
1030 iounmap(bridge
->gatt_table
);
1032 table
= (char *) bridge
->gatt_table_real
;
1033 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
1035 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
1036 ClearPageReserved(page
);
1038 free_gatt_pages(bridge
->gatt_table_real
, page_order
);
1040 agp_gatt_table
= NULL
;
1041 bridge
->gatt_table
= NULL
;
1042 bridge
->gatt_table_real
= NULL
;
1043 bridge
->gatt_bus_addr
= 0;
1047 EXPORT_SYMBOL(agp_generic_free_gatt_table
);
1050 int agp_generic_insert_memory(struct agp_memory
* mem
, off_t pg_start
, int type
)
1056 struct agp_bridge_data
*bridge
;
1059 bridge
= mem
->bridge
;
1063 if (mem
->page_count
== 0)
1066 temp
= bridge
->current_size
;
1068 switch (bridge
->driver
->size_type
) {
1070 num_entries
= A_SIZE_8(temp
)->num_entries
;
1073 num_entries
= A_SIZE_16(temp
)->num_entries
;
1076 num_entries
= A_SIZE_32(temp
)->num_entries
;
1078 case FIXED_APER_SIZE
:
1079 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
1081 case LVL2_APER_SIZE
:
1082 /* The generic routines can't deal with 2 level gatt's */
1090 num_entries
-= agp_memory_reserved
/PAGE_SIZE
;
1091 if (num_entries
< 0) num_entries
= 0;
1093 if (type
!= mem
->type
)
1096 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1097 if (mask_type
!= 0) {
1098 /* The generic routines know nothing of memory types */
1102 /* AK: could wrap */
1103 if ((pg_start
+ mem
->page_count
) > num_entries
)
1108 while (j
< (pg_start
+ mem
->page_count
)) {
1109 if (!PGE_EMPTY(bridge
, readl(bridge
->gatt_table
+j
)))
1114 if (!mem
->is_flushed
) {
1115 bridge
->driver
->cache_flush();
1116 mem
->is_flushed
= true;
1119 for (i
= 0, j
= pg_start
; i
< mem
->page_count
; i
++, j
++) {
1120 writel(bridge
->driver
->mask_memory(bridge
, mem
->memory
[i
], mask_type
),
1121 bridge
->gatt_table
+j
);
1123 readl(bridge
->gatt_table
+j
-1); /* PCI Posting. */
1125 bridge
->driver
->tlb_flush(mem
);
1128 EXPORT_SYMBOL(agp_generic_insert_memory
);
1131 int agp_generic_remove_memory(struct agp_memory
*mem
, off_t pg_start
, int type
)
1134 struct agp_bridge_data
*bridge
;
1137 bridge
= mem
->bridge
;
1141 if (mem
->page_count
== 0)
1144 if (type
!= mem
->type
)
1147 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1148 if (mask_type
!= 0) {
1149 /* The generic routines know nothing of memory types */
1153 /* AK: bogus, should encode addresses > 4GB */
1154 for (i
= pg_start
; i
< (mem
->page_count
+ pg_start
); i
++) {
1155 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
1157 readl(bridge
->gatt_table
+i
-1); /* PCI Posting. */
1159 bridge
->driver
->tlb_flush(mem
);
1162 EXPORT_SYMBOL(agp_generic_remove_memory
);
1164 struct agp_memory
*agp_generic_alloc_by_type(size_t page_count
, int type
)
1168 EXPORT_SYMBOL(agp_generic_alloc_by_type
);
1170 void agp_generic_free_by_type(struct agp_memory
*curr
)
1172 agp_free_page_array(curr
);
1173 agp_free_key(curr
->key
);
1176 EXPORT_SYMBOL(agp_generic_free_by_type
);
1178 struct agp_memory
*agp_generic_alloc_user(size_t page_count
, int type
)
1180 struct agp_memory
*new;
1184 pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
1185 new = agp_create_user_memory(page_count
);
1189 for (i
= 0; i
< page_count
; i
++)
1191 new->page_count
= 0;
1193 new->num_scratch_pages
= pages
;
1197 EXPORT_SYMBOL(agp_generic_alloc_user
);
1200 * Basic Page Allocation Routines -
1201 * These routines handle page allocation and by default they reserve the allocated
1202 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1203 * against a maximum value.
1206 void *agp_generic_alloc_page(struct agp_bridge_data
*bridge
)
1210 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
);
1214 map_page_into_agp(page
);
1217 atomic_inc(&agp_bridge
->current_memory_agp
);
1218 return page_address(page
);
1220 EXPORT_SYMBOL(agp_generic_alloc_page
);
1223 void agp_generic_destroy_page(void *addr
, int flags
)
1230 page
= virt_to_page(addr
);
1231 if (flags
& AGP_PAGE_DESTROY_UNMAP
)
1232 unmap_page_from_agp(page
);
1234 if (flags
& AGP_PAGE_DESTROY_FREE
) {
1236 free_page((unsigned long)addr
);
1237 atomic_dec(&agp_bridge
->current_memory_agp
);
1240 EXPORT_SYMBOL(agp_generic_destroy_page
);
1242 /* End Basic Page Allocation Routines */
1246 * agp_enable - initialise the agp point-to-point connection.
1248 * @mode: agp mode register value to configure with.
1250 void agp_enable(struct agp_bridge_data
*bridge
, u32 mode
)
1254 bridge
->driver
->agp_enable(bridge
, mode
);
1256 EXPORT_SYMBOL(agp_enable
);
1258 /* When we remove the global variable agp_bridge from all drivers
1259 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1262 struct agp_bridge_data
*agp_generic_find_bridge(struct pci_dev
*pdev
)
1264 if (list_empty(&agp_bridges
))
1270 static void ipi_handler(void *null
)
1275 void global_cache_flush(void)
1277 if (on_each_cpu(ipi_handler
, NULL
, 1) != 0)
1278 panic(PFX
"timed out waiting for the other CPUs!\n");
1280 EXPORT_SYMBOL(global_cache_flush
);
1282 unsigned long agp_generic_mask_memory(struct agp_bridge_data
*bridge
,
1283 unsigned long addr
, int type
)
1285 /* memory type is ignored in the generic routine */
1286 if (bridge
->driver
->masks
)
1287 return addr
| bridge
->driver
->masks
[0].mask
;
1291 EXPORT_SYMBOL(agp_generic_mask_memory
);
1293 int agp_generic_type_to_mask_type(struct agp_bridge_data
*bridge
,
1296 if (type
>= AGP_USER_TYPES
)
1300 EXPORT_SYMBOL(agp_generic_type_to_mask_type
);
1303 * These functions are implemented according to the AGPv3 spec,
1304 * which covers implementation details that had previously been
1308 int agp3_generic_fetch_size(void)
1312 struct aper_size_info_16
*values
;
1314 pci_read_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, &temp_size
);
1315 values
= A_SIZE_16(agp_bridge
->driver
->aperture_sizes
);
1317 for (i
= 0; i
< agp_bridge
->driver
->num_aperture_sizes
; i
++) {
1318 if (temp_size
== values
[i
].size_value
) {
1319 agp_bridge
->previous_size
=
1320 agp_bridge
->current_size
= (void *) (values
+ i
);
1322 agp_bridge
->aperture_size_idx
= i
;
1323 return values
[i
].size
;
1328 EXPORT_SYMBOL(agp3_generic_fetch_size
);
1330 void agp3_generic_tlbflush(struct agp_memory
*mem
)
1333 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1334 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_GTLBEN
);
1335 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
);
1337 EXPORT_SYMBOL(agp3_generic_tlbflush
);
1339 int agp3_generic_configure(void)
1342 struct aper_size_info_16
*current_size
;
1344 current_size
= A_SIZE_16(agp_bridge
->current_size
);
1346 pci_read_config_dword(agp_bridge
->dev
, AGP_APBASE
, &temp
);
1347 agp_bridge
->gart_bus_addr
= (temp
& PCI_BASE_ADDRESS_MEM_MASK
);
1349 /* set aperture size */
1350 pci_write_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, current_size
->size_value
);
1351 /* set gart pointer */
1352 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPGARTLO
, agp_bridge
->gatt_bus_addr
);
1353 /* enable aperture and GTLB */
1354 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &temp
);
1355 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, temp
| AGPCTRL_APERENB
| AGPCTRL_GTLBEN
);
1358 EXPORT_SYMBOL(agp3_generic_configure
);
1360 void agp3_generic_cleanup(void)
1363 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1364 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_APERENB
);
1366 EXPORT_SYMBOL(agp3_generic_cleanup
);
1368 const struct aper_size_info_16 agp3_generic_sizes
[AGP_GENERIC_SIZES_ENTRIES
] =
1370 {4096, 1048576, 10,0x000},
1371 {2048, 524288, 9, 0x800},
1372 {1024, 262144, 8, 0xc00},
1373 { 512, 131072, 7, 0xe00},
1374 { 256, 65536, 6, 0xf00},
1375 { 128, 32768, 5, 0xf20},
1376 { 64, 16384, 4, 0xf30},
1377 { 32, 8192, 3, 0xf38},
1378 { 16, 4096, 2, 0xf3c},
1379 { 8, 2048, 1, 0xf3e},
1380 { 4, 1024, 0, 0xf3f}
1382 EXPORT_SYMBOL(agp3_generic_sizes
);