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
);
84 * Use kmalloc if possible for the page list. Otherwise fall back to
85 * vmalloc. This speeds things up and also saves memory for small AGP
89 void agp_alloc_page_array(size_t size
, struct agp_memory
*mem
)
92 mem
->vmalloc_flag
= 0;
94 if (size
<= 2*PAGE_SIZE
)
95 mem
->memory
= kmalloc(size
, GFP_KERNEL
| __GFP_NORETRY
);
96 if (mem
->memory
== NULL
) {
97 mem
->memory
= vmalloc(size
);
98 mem
->vmalloc_flag
= 1;
101 EXPORT_SYMBOL(agp_alloc_page_array
);
103 void agp_free_page_array(struct agp_memory
*mem
)
105 if (mem
->vmalloc_flag
) {
111 EXPORT_SYMBOL(agp_free_page_array
);
114 static struct agp_memory
*agp_create_user_memory(unsigned long num_agp_pages
)
116 struct agp_memory
*new;
117 unsigned long alloc_size
= num_agp_pages
*sizeof(struct page
*);
119 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
123 new->key
= agp_get_key();
130 agp_alloc_page_array(alloc_size
, new);
132 if (new->memory
== NULL
) {
133 agp_free_key(new->key
);
137 new->num_scratch_pages
= 0;
141 struct agp_memory
*agp_create_memory(int scratch_pages
)
143 struct agp_memory
*new;
145 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
149 new->key
= agp_get_key();
156 agp_alloc_page_array(PAGE_SIZE
* scratch_pages
, new);
158 if (new->memory
== NULL
) {
159 agp_free_key(new->key
);
163 new->num_scratch_pages
= scratch_pages
;
164 new->type
= AGP_NORMAL_MEMORY
;
167 EXPORT_SYMBOL(agp_create_memory
);
170 * agp_free_memory - free memory associated with an agp_memory pointer.
172 * @curr: agp_memory pointer to be freed.
174 * It is the only function that can be called when the backend is not owned
175 * by the caller. (So it can free memory on client death.)
177 void agp_free_memory(struct agp_memory
*curr
)
184 if (curr
->is_bound
== TRUE
)
185 agp_unbind_memory(curr
);
187 if (curr
->type
>= AGP_USER_TYPES
) {
188 agp_generic_free_by_type(curr
);
192 if (curr
->type
!= 0) {
193 curr
->bridge
->driver
->free_by_type(curr
);
196 if (curr
->page_count
!= 0) {
197 for (i
= 0; i
< curr
->page_count
; i
++) {
198 curr
->bridge
->driver
->agp_destroy_page(gart_to_virt(curr
->memory
[i
]));
200 flush_agp_mappings();
202 agp_free_key(curr
->key
);
203 agp_free_page_array(curr
);
206 EXPORT_SYMBOL(agp_free_memory
);
208 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
211 * agp_allocate_memory - allocate a group of pages of a certain type.
213 * @page_count: size_t argument of the number of pages
214 * @type: u32 argument of the type of memory to be allocated.
216 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
217 * maps to physical ram. Any other type is device dependent.
219 * It returns NULL whenever memory is unavailable.
221 struct agp_memory
*agp_allocate_memory(struct agp_bridge_data
*bridge
,
222 size_t page_count
, u32 type
)
225 struct agp_memory
*new;
231 if ((atomic_read(&bridge
->current_memory_agp
) + page_count
) > bridge
->max_memory_agp
)
234 if (type
>= AGP_USER_TYPES
) {
235 new = agp_generic_alloc_user(page_count
, type
);
237 new->bridge
= bridge
;
242 new = bridge
->driver
->alloc_by_type(page_count
, type
);
244 new->bridge
= bridge
;
248 scratch_pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
250 new = agp_create_memory(scratch_pages
);
255 for (i
= 0; i
< page_count
; i
++) {
256 void *addr
= bridge
->driver
->agp_alloc_page(bridge
);
259 agp_free_memory(new);
262 new->memory
[i
] = virt_to_gart(addr
);
265 new->bridge
= bridge
;
267 flush_agp_mappings();
271 EXPORT_SYMBOL(agp_allocate_memory
);
274 /* End - Generic routines for handling agp_memory structures */
277 static int agp_return_size(void)
282 temp
= agp_bridge
->current_size
;
284 switch (agp_bridge
->driver
->size_type
) {
286 current_size
= A_SIZE_8(temp
)->size
;
289 current_size
= A_SIZE_16(temp
)->size
;
292 current_size
= A_SIZE_32(temp
)->size
;
295 current_size
= A_SIZE_LVL2(temp
)->size
;
297 case FIXED_APER_SIZE
:
298 current_size
= A_SIZE_FIX(temp
)->size
;
305 current_size
-= (agp_memory_reserved
/ (1024*1024));
312 int agp_num_entries(void)
317 temp
= agp_bridge
->current_size
;
319 switch (agp_bridge
->driver
->size_type
) {
321 num_entries
= A_SIZE_8(temp
)->num_entries
;
324 num_entries
= A_SIZE_16(temp
)->num_entries
;
327 num_entries
= A_SIZE_32(temp
)->num_entries
;
330 num_entries
= A_SIZE_LVL2(temp
)->num_entries
;
332 case FIXED_APER_SIZE
:
333 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
340 num_entries
-= agp_memory_reserved
>>PAGE_SHIFT
;
345 EXPORT_SYMBOL_GPL(agp_num_entries
);
349 * agp_copy_info - copy bridge state information
351 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
353 * This function copies information about the agp bridge device and the state of
354 * the agp backend into an agp_kern_info pointer.
356 int agp_copy_info(struct agp_bridge_data
*bridge
, struct agp_kern_info
*info
)
358 memset(info
, 0, sizeof(struct agp_kern_info
));
360 info
->chipset
= NOT_SUPPORTED
;
364 info
->version
.major
= bridge
->version
->major
;
365 info
->version
.minor
= bridge
->version
->minor
;
366 info
->chipset
= SUPPORTED
;
367 info
->device
= bridge
->dev
;
368 if (bridge
->mode
& AGPSTAT_MODE_3_0
)
369 info
->mode
= bridge
->mode
& ~AGP3_RESERVED_MASK
;
371 info
->mode
= bridge
->mode
& ~AGP2_RESERVED_MASK
;
372 info
->aper_base
= bridge
->gart_bus_addr
;
373 info
->aper_size
= agp_return_size();
374 info
->max_memory
= bridge
->max_memory_agp
;
375 info
->current_memory
= atomic_read(&bridge
->current_memory_agp
);
376 info
->cant_use_aperture
= bridge
->driver
->cant_use_aperture
;
377 info
->vm_ops
= bridge
->vm_ops
;
378 info
->page_mask
= ~0UL;
381 EXPORT_SYMBOL(agp_copy_info
);
383 /* End - Routine to copy over information structure */
386 * Routines for handling swapping of agp_memory into the GATT -
387 * These routines take agp_memory and insert them into the GATT.
388 * They call device specific routines to actually write to the GATT.
392 * agp_bind_memory - Bind an agp_memory structure into the GATT.
394 * @curr: agp_memory pointer
395 * @pg_start: an offset into the graphics aperture translation table
397 * It returns -EINVAL if the pointer == NULL.
398 * It returns -EBUSY if the area of the table requested is already in use.
400 int agp_bind_memory(struct agp_memory
*curr
, off_t pg_start
)
407 if (curr
->is_bound
== TRUE
) {
408 printk(KERN_INFO PFX
"memory %p is already bound!\n", curr
);
411 if (curr
->is_flushed
== FALSE
) {
412 curr
->bridge
->driver
->cache_flush();
413 curr
->is_flushed
= TRUE
;
415 ret_val
= curr
->bridge
->driver
->insert_memory(curr
, pg_start
, curr
->type
);
420 curr
->is_bound
= TRUE
;
421 curr
->pg_start
= pg_start
;
424 EXPORT_SYMBOL(agp_bind_memory
);
428 * agp_unbind_memory - Removes an agp_memory structure from the GATT
430 * @curr: agp_memory pointer to be removed from the GATT.
432 * It returns -EINVAL if this piece of agp_memory is not currently bound to
433 * the graphics aperture translation table or if the agp_memory pointer == NULL
435 int agp_unbind_memory(struct agp_memory
*curr
)
442 if (curr
->is_bound
!= TRUE
) {
443 printk(KERN_INFO PFX
"memory %p was not bound!\n", curr
);
447 ret_val
= curr
->bridge
->driver
->remove_memory(curr
, curr
->pg_start
, curr
->type
);
452 curr
->is_bound
= FALSE
;
456 EXPORT_SYMBOL(agp_unbind_memory
);
458 /* End - Routines for handling swapping of agp_memory into the GATT */
461 /* Generic Agp routines - Start */
462 static void agp_v2_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
466 if (*requested_mode
& AGP2_RESERVED_MASK
) {
467 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
468 *requested_mode
& AGP2_RESERVED_MASK
, *requested_mode
);
469 *requested_mode
&= ~AGP2_RESERVED_MASK
;
473 * Some dumb bridges are programmed to disobey the AGP2 spec.
474 * This is likely a BIOS misprogramming rather than poweron default, or
475 * it would be a lot more common.
476 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
477 * AGPv2 spec 6.1.9 states:
478 * The RATE field indicates the data transfer rates supported by this
479 * device. A.G.P. devices must report all that apply.
480 * Fix them up as best we can.
482 switch (*bridge_agpstat
& 7) {
484 *bridge_agpstat
|= (AGPSTAT2_2X
| AGPSTAT2_1X
);
485 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x4 rate"
486 "Fixing up support for x2 & x1\n");
489 *bridge_agpstat
|= AGPSTAT2_1X
;
490 printk(KERN_INFO PFX
"BIOS bug. AGP bridge claims to only support x2 rate"
491 "Fixing up support for x1\n");
497 /* Check the speed bits make sense. Only one should be set. */
498 tmp
= *requested_mode
& 7;
501 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to x1 mode.\n", current
->comm
);
502 *requested_mode
|= AGPSTAT2_1X
;
508 *requested_mode
&= ~(AGPSTAT2_1X
); /* rate=2 */
515 *requested_mode
&= ~(AGPSTAT2_1X
|AGPSTAT2_2X
); /* rate=4*/
519 /* disable SBA if it's not supported */
520 if (!((*bridge_agpstat
& AGPSTAT_SBA
) && (*vga_agpstat
& AGPSTAT_SBA
) && (*requested_mode
& AGPSTAT_SBA
)))
521 *bridge_agpstat
&= ~AGPSTAT_SBA
;
524 if (!((*bridge_agpstat
& AGPSTAT2_4X
) && (*vga_agpstat
& AGPSTAT2_4X
) && (*requested_mode
& AGPSTAT2_4X
)))
525 *bridge_agpstat
&= ~AGPSTAT2_4X
;
527 if (!((*bridge_agpstat
& AGPSTAT2_2X
) && (*vga_agpstat
& AGPSTAT2_2X
) && (*requested_mode
& AGPSTAT2_2X
)))
528 *bridge_agpstat
&= ~AGPSTAT2_2X
;
530 if (!((*bridge_agpstat
& AGPSTAT2_1X
) && (*vga_agpstat
& AGPSTAT2_1X
) && (*requested_mode
& AGPSTAT2_1X
)))
531 *bridge_agpstat
&= ~AGPSTAT2_1X
;
533 /* Now we know what mode it should be, clear out the unwanted bits. */
534 if (*bridge_agpstat
& AGPSTAT2_4X
)
535 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_2X
); /* 4X */
537 if (*bridge_agpstat
& AGPSTAT2_2X
)
538 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_4X
); /* 2X */
540 if (*bridge_agpstat
& AGPSTAT2_1X
)
541 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
); /* 1X */
543 /* Apply any errata. */
544 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
545 *bridge_agpstat
&= ~AGPSTAT_FW
;
547 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
548 *bridge_agpstat
&= ~AGPSTAT_SBA
;
550 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
551 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
552 *bridge_agpstat
|= AGPSTAT2_1X
;
555 /* If we've dropped down to 1X, disable fast writes. */
556 if (*bridge_agpstat
& AGPSTAT2_1X
)
557 *bridge_agpstat
&= ~AGPSTAT_FW
;
561 * requested_mode = Mode requested by (typically) X.
562 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
563 * vga_agpstat = PCI_AGP_STATUS from graphic card.
565 static void agp_v3_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
567 u32 origbridge
=*bridge_agpstat
, origvga
=*vga_agpstat
;
570 if (*requested_mode
& AGP3_RESERVED_MASK
) {
571 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
572 *requested_mode
& AGP3_RESERVED_MASK
, *requested_mode
);
573 *requested_mode
&= ~AGP3_RESERVED_MASK
;
576 /* Check the speed bits make sense. */
577 tmp
= *requested_mode
& 7;
579 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current
->comm
);
580 *requested_mode
|= AGPSTAT3_4X
;
583 printk(KERN_INFO PFX
"%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current
->comm
, tmp
* 4);
584 *requested_mode
= (*requested_mode
& ~7) | AGPSTAT3_8X
;
587 /* ARQSZ - Set the value to the maximum one.
588 * Don't allow the mode register to override values. */
589 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_ARQSZ
) |
590 max_t(u32
,(*bridge_agpstat
& AGPSTAT_ARQSZ
),(*vga_agpstat
& AGPSTAT_ARQSZ
)));
592 /* Calibration cycle.
593 * Don't allow the mode register to override values. */
594 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_CAL_MASK
) |
595 min_t(u32
,(*bridge_agpstat
& AGPSTAT_CAL_MASK
),(*vga_agpstat
& AGPSTAT_CAL_MASK
)));
597 /* SBA *must* be supported for AGP v3 */
598 *bridge_agpstat
|= AGPSTAT_SBA
;
602 * Check for invalid speeds. This can happen when applications
603 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
605 if (*requested_mode
& AGPSTAT_MODE_3_0
) {
607 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
608 * have been passed a 3.0 mode, but with 2.x speed bits set.
609 * AGP2.x 4x -> AGP3.0 4x.
611 if (*requested_mode
& AGPSTAT2_4X
) {
612 printk(KERN_INFO PFX
"%s passes broken AGP3 flags (%x). Fixed.\n",
613 current
->comm
, *requested_mode
);
614 *requested_mode
&= ~AGPSTAT2_4X
;
615 *requested_mode
|= AGPSTAT3_4X
;
619 * The caller doesn't know what they are doing. We are in 3.0 mode,
620 * but have been passed an AGP 2.x mode.
621 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
623 printk(KERN_INFO PFX
"%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
624 current
->comm
, *requested_mode
);
625 *requested_mode
&= ~(AGPSTAT2_4X
| AGPSTAT2_2X
| AGPSTAT2_1X
);
626 *requested_mode
|= AGPSTAT3_4X
;
629 if (*requested_mode
& AGPSTAT3_8X
) {
630 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
631 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
632 *bridge_agpstat
|= AGPSTAT3_4X
;
633 printk(KERN_INFO PFX
"%s requested AGPx8 but bridge not capable.\n", current
->comm
);
636 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
637 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
638 *bridge_agpstat
|= AGPSTAT3_4X
;
639 printk(KERN_INFO PFX
"%s requested AGPx8 but graphic card not capable.\n", current
->comm
);
642 /* All set, bridge & device can do AGP x8*/
643 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
646 } else if (*requested_mode
& AGPSTAT3_4X
) {
647 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
648 *bridge_agpstat
|= AGPSTAT3_4X
;
654 * If we didn't specify an AGP mode, we see if both
655 * the graphics card, and the bridge can do x8, and use if so.
656 * If not, we fall back to x4 mode.
658 if ((*bridge_agpstat
& AGPSTAT3_8X
) && (*vga_agpstat
& AGPSTAT3_8X
)) {
659 printk(KERN_INFO PFX
"No AGP mode specified. Setting to highest mode "
660 "supported by bridge & card (x8).\n");
661 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
662 *vga_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
664 printk(KERN_INFO PFX
"Fell back to AGPx4 mode because");
665 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
666 printk(KERN_INFO PFX
"bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
667 *bridge_agpstat
, origbridge
);
668 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
669 *bridge_agpstat
|= AGPSTAT3_4X
;
671 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
672 printk(KERN_INFO PFX
"graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
673 *vga_agpstat
, origvga
);
674 *vga_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
675 *vga_agpstat
|= AGPSTAT3_4X
;
681 /* Apply any errata. */
682 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
683 *bridge_agpstat
&= ~AGPSTAT_FW
;
685 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
686 *bridge_agpstat
&= ~AGPSTAT_SBA
;
688 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
689 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
690 *bridge_agpstat
|= AGPSTAT2_1X
;
696 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
697 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
698 * @requested_mode: requested agp_stat from userspace (Typically from X)
699 * @bridge_agpstat: current agp_stat from AGP bridge.
701 * This function will hunt for an AGP graphics card, and try to match
702 * the requested mode to the capabilities of both the bridge and the card.
704 u32
agp_collect_device_status(struct agp_bridge_data
*bridge
, u32 requested_mode
, u32 bridge_agpstat
)
706 struct pci_dev
*device
= NULL
;
711 device
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, device
);
713 printk(KERN_INFO PFX
"Couldn't find an AGP VGA controller.\n");
716 cap_ptr
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
722 * Ok, here we have a AGP device. Disable impossible
723 * settings, and adjust the readqueue to the minimum.
725 pci_read_config_dword(device
, cap_ptr
+PCI_AGP_STATUS
, &vga_agpstat
);
727 /* adjust RQ depth */
728 bridge_agpstat
= ((bridge_agpstat
& ~AGPSTAT_RQ_DEPTH
) |
729 min_t(u32
, (requested_mode
& AGPSTAT_RQ_DEPTH
),
730 min_t(u32
, (bridge_agpstat
& AGPSTAT_RQ_DEPTH
), (vga_agpstat
& AGPSTAT_RQ_DEPTH
))));
732 /* disable FW if it's not supported */
733 if (!((bridge_agpstat
& AGPSTAT_FW
) &&
734 (vga_agpstat
& AGPSTAT_FW
) &&
735 (requested_mode
& AGPSTAT_FW
)))
736 bridge_agpstat
&= ~AGPSTAT_FW
;
738 /* Check to see if we are operating in 3.0 mode */
739 if (agp_bridge
->mode
& AGPSTAT_MODE_3_0
)
740 agp_v3_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
742 agp_v2_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
745 return bridge_agpstat
;
747 EXPORT_SYMBOL(agp_collect_device_status
);
750 void agp_device_command(u32 bridge_agpstat
, int agp_v3
)
752 struct pci_dev
*device
= NULL
;
755 mode
= bridge_agpstat
& 0x7;
759 for_each_pci_dev(device
) {
760 u8 agp
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
764 printk(KERN_INFO PFX
"Putting AGP V%d device at %s into %dx mode\n",
765 agp_v3
? 3 : 2, pci_name(device
), mode
);
766 pci_write_config_dword(device
, agp
+ PCI_AGP_COMMAND
, bridge_agpstat
);
769 EXPORT_SYMBOL(agp_device_command
);
772 void get_agp_version(struct agp_bridge_data
*bridge
)
776 /* Exit early if already set by errata workarounds. */
777 if (bridge
->major_version
!= 0)
780 pci_read_config_dword(bridge
->dev
, bridge
->capndx
, &ncapid
);
781 bridge
->major_version
= (ncapid
>> AGP_MAJOR_VERSION_SHIFT
) & 0xf;
782 bridge
->minor_version
= (ncapid
>> AGP_MINOR_VERSION_SHIFT
) & 0xf;
784 EXPORT_SYMBOL(get_agp_version
);
787 void agp_generic_enable(struct agp_bridge_data
*bridge
, u32 requested_mode
)
789 u32 bridge_agpstat
, temp
;
791 get_agp_version(agp_bridge
);
793 printk(KERN_INFO PFX
"Found an AGP %d.%d compliant device at %s.\n",
794 agp_bridge
->major_version
,
795 agp_bridge
->minor_version
,
796 pci_name(agp_bridge
->dev
));
798 pci_read_config_dword(agp_bridge
->dev
,
799 agp_bridge
->capndx
+ PCI_AGP_STATUS
, &bridge_agpstat
);
801 bridge_agpstat
= agp_collect_device_status(agp_bridge
, requested_mode
, bridge_agpstat
);
802 if (bridge_agpstat
== 0)
803 /* Something bad happened. FIXME: Return error code? */
806 bridge_agpstat
|= AGPSTAT_AGP_ENABLE
;
808 /* Do AGP version specific frobbing. */
809 if (bridge
->major_version
>= 3) {
810 if (bridge
->mode
& AGPSTAT_MODE_3_0
) {
811 /* If we have 3.5, we can do the isoch stuff. */
812 if (bridge
->minor_version
>= 5)
813 agp_3_5_enable(bridge
);
814 agp_device_command(bridge_agpstat
, TRUE
);
817 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
818 bridge_agpstat
&= ~(7<<10) ;
819 pci_read_config_dword(bridge
->dev
,
820 bridge
->capndx
+AGPCTRL
, &temp
);
822 pci_write_config_dword(bridge
->dev
,
823 bridge
->capndx
+AGPCTRL
, temp
);
825 printk(KERN_INFO PFX
"Device is in legacy mode,"
826 " falling back to 2.x\n");
831 agp_device_command(bridge_agpstat
, FALSE
);
833 EXPORT_SYMBOL(agp_generic_enable
);
836 int agp_generic_create_gatt_table(struct agp_bridge_data
*bridge
)
847 /* The generic routines can't handle 2 level gatt's */
848 if (bridge
->driver
->size_type
== LVL2_APER_SIZE
)
852 i
= bridge
->aperture_size_idx
;
853 temp
= bridge
->current_size
;
854 size
= page_order
= num_entries
= 0;
856 if (bridge
->driver
->size_type
!= FIXED_APER_SIZE
) {
858 switch (bridge
->driver
->size_type
) {
860 size
= A_SIZE_8(temp
)->size
;
862 A_SIZE_8(temp
)->page_order
;
864 A_SIZE_8(temp
)->num_entries
;
867 size
= A_SIZE_16(temp
)->size
;
868 page_order
= A_SIZE_16(temp
)->page_order
;
869 num_entries
= A_SIZE_16(temp
)->num_entries
;
872 size
= A_SIZE_32(temp
)->size
;
873 page_order
= A_SIZE_32(temp
)->page_order
;
874 num_entries
= A_SIZE_32(temp
)->num_entries
;
876 /* This case will never really happen. */
877 case FIXED_APER_SIZE
:
880 size
= page_order
= num_entries
= 0;
884 table
= alloc_gatt_pages(page_order
);
888 switch (bridge
->driver
->size_type
) {
890 bridge
->current_size
= A_IDX8(bridge
);
893 bridge
->current_size
= A_IDX16(bridge
);
896 bridge
->current_size
= A_IDX32(bridge
);
898 /* These cases will never really happen. */
899 case FIXED_APER_SIZE
:
904 temp
= bridge
->current_size
;
906 bridge
->aperture_size_idx
= i
;
908 } while (!table
&& (i
< bridge
->driver
->num_aperture_sizes
));
910 size
= ((struct aper_size_info_fixed
*) temp
)->size
;
911 page_order
= ((struct aper_size_info_fixed
*) temp
)->page_order
;
912 num_entries
= ((struct aper_size_info_fixed
*) temp
)->num_entries
;
913 table
= alloc_gatt_pages(page_order
);
919 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
921 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
922 SetPageReserved(page
);
924 bridge
->gatt_table_real
= (u32
*) table
;
925 agp_gatt_table
= (void *)table
;
927 bridge
->driver
->cache_flush();
928 bridge
->gatt_table
= ioremap_nocache(virt_to_gart(table
),
929 (PAGE_SIZE
* (1 << page_order
)));
930 bridge
->driver
->cache_flush();
932 if (bridge
->gatt_table
== NULL
) {
933 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
934 ClearPageReserved(page
);
936 free_gatt_pages(table
, page_order
);
940 bridge
->gatt_bus_addr
= virt_to_gart(bridge
->gatt_table_real
);
942 /* AK: bogus, should encode addresses > 4GB */
943 for (i
= 0; i
< num_entries
; i
++) {
944 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
945 readl(bridge
->gatt_table
+i
); /* PCI Posting. */
950 EXPORT_SYMBOL(agp_generic_create_gatt_table
);
952 int agp_generic_free_gatt_table(struct agp_bridge_data
*bridge
)
955 char *table
, *table_end
;
959 temp
= bridge
->current_size
;
961 switch (bridge
->driver
->size_type
) {
963 page_order
= A_SIZE_8(temp
)->page_order
;
966 page_order
= A_SIZE_16(temp
)->page_order
;
969 page_order
= A_SIZE_32(temp
)->page_order
;
971 case FIXED_APER_SIZE
:
972 page_order
= A_SIZE_FIX(temp
)->page_order
;
975 /* The generic routines can't deal with 2 level gatt's */
983 /* Do not worry about freeing memory, because if this is
984 * called, then all agp memory is deallocated and removed
987 iounmap(bridge
->gatt_table
);
988 table
= (char *) bridge
->gatt_table_real
;
989 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
991 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
992 ClearPageReserved(page
);
994 free_gatt_pages(bridge
->gatt_table_real
, page_order
);
996 agp_gatt_table
= NULL
;
997 bridge
->gatt_table
= NULL
;
998 bridge
->gatt_table_real
= NULL
;
999 bridge
->gatt_bus_addr
= 0;
1003 EXPORT_SYMBOL(agp_generic_free_gatt_table
);
1006 int agp_generic_insert_memory(struct agp_memory
* mem
, off_t pg_start
, int type
)
1012 struct agp_bridge_data
*bridge
;
1015 bridge
= mem
->bridge
;
1019 if (mem
->page_count
== 0)
1022 temp
= bridge
->current_size
;
1024 switch (bridge
->driver
->size_type
) {
1026 num_entries
= A_SIZE_8(temp
)->num_entries
;
1029 num_entries
= A_SIZE_16(temp
)->num_entries
;
1032 num_entries
= A_SIZE_32(temp
)->num_entries
;
1034 case FIXED_APER_SIZE
:
1035 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
1037 case LVL2_APER_SIZE
:
1038 /* The generic routines can't deal with 2 level gatt's */
1046 num_entries
-= agp_memory_reserved
/PAGE_SIZE
;
1047 if (num_entries
< 0) num_entries
= 0;
1049 if (type
!= mem
->type
)
1052 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1053 if (mask_type
!= 0) {
1054 /* The generic routines know nothing of memory types */
1058 /* AK: could wrap */
1059 if ((pg_start
+ mem
->page_count
) > num_entries
)
1064 while (j
< (pg_start
+ mem
->page_count
)) {
1065 if (!PGE_EMPTY(bridge
, readl(bridge
->gatt_table
+j
)))
1070 if (mem
->is_flushed
== FALSE
) {
1071 bridge
->driver
->cache_flush();
1072 mem
->is_flushed
= TRUE
;
1075 for (i
= 0, j
= pg_start
; i
< mem
->page_count
; i
++, j
++) {
1076 writel(bridge
->driver
->mask_memory(bridge
, mem
->memory
[i
], mask_type
),
1077 bridge
->gatt_table
+j
);
1079 readl(bridge
->gatt_table
+j
-1); /* PCI Posting. */
1081 bridge
->driver
->tlb_flush(mem
);
1084 EXPORT_SYMBOL(agp_generic_insert_memory
);
1087 int agp_generic_remove_memory(struct agp_memory
*mem
, off_t pg_start
, int type
)
1090 struct agp_bridge_data
*bridge
;
1093 bridge
= mem
->bridge
;
1097 if (mem
->page_count
== 0)
1100 if (type
!= mem
->type
)
1103 mask_type
= bridge
->driver
->agp_type_to_mask_type(bridge
, type
);
1104 if (mask_type
!= 0) {
1105 /* The generic routines know nothing of memory types */
1109 /* AK: bogus, should encode addresses > 4GB */
1110 for (i
= pg_start
; i
< (mem
->page_count
+ pg_start
); i
++) {
1111 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
1113 readl(bridge
->gatt_table
+i
-1); /* PCI Posting. */
1115 bridge
->driver
->tlb_flush(mem
);
1118 EXPORT_SYMBOL(agp_generic_remove_memory
);
1120 struct agp_memory
*agp_generic_alloc_by_type(size_t page_count
, int type
)
1124 EXPORT_SYMBOL(agp_generic_alloc_by_type
);
1126 void agp_generic_free_by_type(struct agp_memory
*curr
)
1128 agp_free_page_array(curr
);
1129 agp_free_key(curr
->key
);
1132 EXPORT_SYMBOL(agp_generic_free_by_type
);
1134 struct agp_memory
*agp_generic_alloc_user(size_t page_count
, int type
)
1136 struct agp_memory
*new;
1140 pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
1141 new = agp_create_user_memory(page_count
);
1145 for (i
= 0; i
< page_count
; i
++)
1147 new->page_count
= 0;
1149 new->num_scratch_pages
= pages
;
1153 EXPORT_SYMBOL(agp_generic_alloc_user
);
1156 * Basic Page Allocation Routines -
1157 * These routines handle page allocation and by default they reserve the allocated
1158 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1159 * against a maximum value.
1162 void *agp_generic_alloc_page(struct agp_bridge_data
*bridge
)
1166 page
= alloc_page(GFP_KERNEL
| GFP_DMA32
);
1170 map_page_into_agp(page
);
1173 atomic_inc(&agp_bridge
->current_memory_agp
);
1174 return page_address(page
);
1176 EXPORT_SYMBOL(agp_generic_alloc_page
);
1179 void agp_generic_destroy_page(void *addr
)
1186 page
= virt_to_page(addr
);
1187 unmap_page_from_agp(page
);
1189 free_page((unsigned long)addr
);
1190 atomic_dec(&agp_bridge
->current_memory_agp
);
1192 EXPORT_SYMBOL(agp_generic_destroy_page
);
1194 /* End Basic Page Allocation Routines */
1198 * agp_enable - initialise the agp point-to-point connection.
1200 * @mode: agp mode register value to configure with.
1202 void agp_enable(struct agp_bridge_data
*bridge
, u32 mode
)
1206 bridge
->driver
->agp_enable(bridge
, mode
);
1208 EXPORT_SYMBOL(agp_enable
);
1210 /* When we remove the global variable agp_bridge from all drivers
1211 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1214 struct agp_bridge_data
*agp_generic_find_bridge(struct pci_dev
*pdev
)
1216 if (list_empty(&agp_bridges
))
1222 static void ipi_handler(void *null
)
1227 void global_cache_flush(void)
1229 if (on_each_cpu(ipi_handler
, NULL
, 1, 1) != 0)
1230 panic(PFX
"timed out waiting for the other CPUs!\n");
1232 EXPORT_SYMBOL(global_cache_flush
);
1234 unsigned long agp_generic_mask_memory(struct agp_bridge_data
*bridge
,
1235 unsigned long addr
, int type
)
1237 /* memory type is ignored in the generic routine */
1238 if (bridge
->driver
->masks
)
1239 return addr
| bridge
->driver
->masks
[0].mask
;
1243 EXPORT_SYMBOL(agp_generic_mask_memory
);
1245 int agp_generic_type_to_mask_type(struct agp_bridge_data
*bridge
,
1248 if (type
>= AGP_USER_TYPES
)
1252 EXPORT_SYMBOL(agp_generic_type_to_mask_type
);
1255 * These functions are implemented according to the AGPv3 spec,
1256 * which covers implementation details that had previously been
1260 int agp3_generic_fetch_size(void)
1264 struct aper_size_info_16
*values
;
1266 pci_read_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, &temp_size
);
1267 values
= A_SIZE_16(agp_bridge
->driver
->aperture_sizes
);
1269 for (i
= 0; i
< agp_bridge
->driver
->num_aperture_sizes
; i
++) {
1270 if (temp_size
== values
[i
].size_value
) {
1271 agp_bridge
->previous_size
=
1272 agp_bridge
->current_size
= (void *) (values
+ i
);
1274 agp_bridge
->aperture_size_idx
= i
;
1275 return values
[i
].size
;
1280 EXPORT_SYMBOL(agp3_generic_fetch_size
);
1282 void agp3_generic_tlbflush(struct agp_memory
*mem
)
1285 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1286 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_GTLBEN
);
1287 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
);
1289 EXPORT_SYMBOL(agp3_generic_tlbflush
);
1291 int agp3_generic_configure(void)
1294 struct aper_size_info_16
*current_size
;
1296 current_size
= A_SIZE_16(agp_bridge
->current_size
);
1298 pci_read_config_dword(agp_bridge
->dev
, AGP_APBASE
, &temp
);
1299 agp_bridge
->gart_bus_addr
= (temp
& PCI_BASE_ADDRESS_MEM_MASK
);
1301 /* set aperture size */
1302 pci_write_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, current_size
->size_value
);
1303 /* set gart pointer */
1304 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPGARTLO
, agp_bridge
->gatt_bus_addr
);
1305 /* enable aperture and GTLB */
1306 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &temp
);
1307 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, temp
| AGPCTRL_APERENB
| AGPCTRL_GTLBEN
);
1310 EXPORT_SYMBOL(agp3_generic_configure
);
1312 void agp3_generic_cleanup(void)
1315 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1316 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_APERENB
);
1318 EXPORT_SYMBOL(agp3_generic_cleanup
);
1320 const struct aper_size_info_16 agp3_generic_sizes
[AGP_GENERIC_SIZES_ENTRIES
] =
1322 {4096, 1048576, 10,0x000},
1323 {2048, 524288, 9, 0x800},
1324 {1024, 262144, 8, 0xc00},
1325 { 512, 131072, 7, 0xe00},
1326 { 256, 65536, 6, 0xf00},
1327 { 128, 32768, 5, 0xf20},
1328 { 64, 16384, 4, 0xf30},
1329 { 32, 8192, 3, 0xf38},
1330 { 16, 4096, 2, 0xf3c},
1331 { 8, 2048, 1, 0xf3e},
1332 { 4, 1024, 0, 0xf3f}
1334 EXPORT_SYMBOL(agp3_generic_sizes
);