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->pages = kmalloc(size, GFP_KERNEL | __GFP_NORETRY);
103 if (mem->pages == NULL) {
104 mem->pages = 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->pages == 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->pages == 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 if (curr->bridge->driver->agp_destroy_pages) {
205 curr->bridge->driver->agp_destroy_pages(curr);
208 for (i = 0; i < curr->page_count; i++) {
209 curr->bridge->driver->agp_destroy_page(
211 AGP_PAGE_DESTROY_UNMAP);
213 for (i = 0; i < curr->page_count; i++) {
214 curr->bridge->driver->agp_destroy_page(
216 AGP_PAGE_DESTROY_FREE);
220 agp_free_key(curr->key);
221 agp_free_page_array(curr);
224 EXPORT_SYMBOL(agp_free_memory);
226 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
229 * agp_allocate_memory - allocate a group of pages of a certain type.
231 * @page_count: size_t argument of the number of pages
232 * @type: u32 argument of the type of memory to be allocated.
234 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
235 * maps to physical ram. Any other type is device dependent.
237 * It returns NULL whenever memory is unavailable.
239 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
240 size_t page_count, u32 type)
243 struct agp_memory *new;
249 if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
252 if (type >= AGP_USER_TYPES) {
253 new = agp_generic_alloc_user(page_count, type);
255 new->bridge = bridge;
260 new = bridge->driver->alloc_by_type(page_count, type);
262 new->bridge = bridge;
266 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
268 new = agp_create_memory(scratch_pages);
273 if (bridge->driver->agp_alloc_pages) {
274 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
275 agp_free_memory(new);
278 new->bridge = bridge;
282 for (i = 0; i < page_count; i++) {
283 struct page *page = bridge->driver->agp_alloc_page(bridge);
286 agp_free_memory(new);
289 new->pages[i] = page;
292 new->bridge = bridge;
296 EXPORT_SYMBOL(agp_allocate_memory);
299 /* End - Generic routines for handling agp_memory structures */
302 static int agp_return_size(void)
307 temp = agp_bridge->current_size;
309 switch (agp_bridge->driver->size_type) {
311 current_size = A_SIZE_8(temp)->size;
314 current_size = A_SIZE_16(temp)->size;
317 current_size = A_SIZE_32(temp)->size;
320 current_size = A_SIZE_LVL2(temp)->size;
322 case FIXED_APER_SIZE:
323 current_size = A_SIZE_FIX(temp)->size;
330 current_size -= (agp_memory_reserved / (1024*1024));
337 int agp_num_entries(void)
342 temp = agp_bridge->current_size;
344 switch (agp_bridge->driver->size_type) {
346 num_entries = A_SIZE_8(temp)->num_entries;
349 num_entries = A_SIZE_16(temp)->num_entries;
352 num_entries = A_SIZE_32(temp)->num_entries;
355 num_entries = A_SIZE_LVL2(temp)->num_entries;
357 case FIXED_APER_SIZE:
358 num_entries = A_SIZE_FIX(temp)->num_entries;
365 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
370 EXPORT_SYMBOL_GPL(agp_num_entries);
374 * agp_copy_info - copy bridge state information
376 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
378 * This function copies information about the agp bridge device and the state of
379 * the agp backend into an agp_kern_info pointer.
381 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
383 memset(info, 0, sizeof(struct agp_kern_info));
385 info->chipset = NOT_SUPPORTED;
389 info->version.major = bridge->version->major;
390 info->version.minor = bridge->version->minor;
391 info->chipset = SUPPORTED;
392 info->device = bridge->dev;
393 if (bridge->mode & AGPSTAT_MODE_3_0)
394 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
396 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
397 info->aper_base = bridge->gart_bus_addr;
398 info->aper_size = agp_return_size();
399 info->max_memory = bridge->max_memory_agp;
400 info->current_memory = atomic_read(&bridge->current_memory_agp);
401 info->cant_use_aperture = bridge->driver->cant_use_aperture;
402 info->vm_ops = bridge->vm_ops;
403 info->page_mask = ~0UL;
406 EXPORT_SYMBOL(agp_copy_info);
408 /* End - Routine to copy over information structure */
411 * Routines for handling swapping of agp_memory into the GATT -
412 * These routines take agp_memory and insert them into the GATT.
413 * They call device specific routines to actually write to the GATT.
417 * agp_bind_memory - Bind an agp_memory structure into the GATT.
419 * @curr: agp_memory pointer
420 * @pg_start: an offset into the graphics aperture translation table
422 * It returns -EINVAL if the pointer == NULL.
423 * It returns -EBUSY if the area of the table requested is already in use.
425 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
432 if (curr->is_bound) {
433 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
436 if (!curr->is_flushed) {
437 curr->bridge->driver->cache_flush();
438 curr->is_flushed = true;
441 if (curr->bridge->driver->agp_map_memory) {
442 ret_val = curr->bridge->driver->agp_map_memory(curr);
446 ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
451 curr->is_bound = true;
452 curr->pg_start = pg_start;
453 spin_lock(&agp_bridge->mapped_lock);
454 list_add(&curr->mapped_list, &agp_bridge->mapped_list);
455 spin_unlock(&agp_bridge->mapped_lock);
459 EXPORT_SYMBOL(agp_bind_memory);
463 * agp_unbind_memory - Removes an agp_memory structure from the GATT
465 * @curr: agp_memory pointer to be removed from the GATT.
467 * It returns -EINVAL if this piece of agp_memory is not currently bound to
468 * the graphics aperture translation table or if the agp_memory pointer == NULL
470 int agp_unbind_memory(struct agp_memory *curr)
477 if (!curr->is_bound) {
478 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
482 ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
487 if (curr->bridge->driver->agp_unmap_memory)
488 curr->bridge->driver->agp_unmap_memory(curr);
490 curr->is_bound = false;
492 spin_lock(&curr->bridge->mapped_lock);
493 list_del(&curr->mapped_list);
494 spin_unlock(&curr->bridge->mapped_lock);
497 EXPORT_SYMBOL(agp_unbind_memory);
500 * agp_rebind_emmory - Rewrite the entire GATT, useful on resume
502 int agp_rebind_memory(void)
504 struct agp_memory *curr;
507 spin_lock(&agp_bridge->mapped_lock);
508 list_for_each_entry(curr, &agp_bridge->mapped_list, mapped_list) {
509 ret_val = curr->bridge->driver->insert_memory(curr,
515 spin_unlock(&agp_bridge->mapped_lock);
518 EXPORT_SYMBOL(agp_rebind_memory);
520 /* End - Routines for handling swapping of agp_memory into the GATT */
523 /* Generic Agp routines - Start */
524 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
528 if (*requested_mode & AGP2_RESERVED_MASK) {
529 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
530 *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
531 *requested_mode &= ~AGP2_RESERVED_MASK;
535 * Some dumb bridges are programmed to disobey the AGP2 spec.
536 * This is likely a BIOS misprogramming rather than poweron default, or
537 * it would be a lot more common.
538 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
539 * AGPv2 spec 6.1.9 states:
540 * The RATE field indicates the data transfer rates supported by this
541 * device. A.G.P. devices must report all that apply.
542 * Fix them up as best we can.
544 switch (*bridge_agpstat & 7) {
546 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
547 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
548 "Fixing up support for x2 & x1\n");
551 *bridge_agpstat |= AGPSTAT2_1X;
552 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
553 "Fixing up support for x1\n");
559 /* Check the speed bits make sense. Only one should be set. */
560 tmp = *requested_mode & 7;
563 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
564 *requested_mode |= AGPSTAT2_1X;
570 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
577 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
581 /* disable SBA if it's not supported */
582 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
583 *bridge_agpstat &= ~AGPSTAT_SBA;
586 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
587 *bridge_agpstat &= ~AGPSTAT2_4X;
589 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
590 *bridge_agpstat &= ~AGPSTAT2_2X;
592 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
593 *bridge_agpstat &= ~AGPSTAT2_1X;
595 /* Now we know what mode it should be, clear out the unwanted bits. */
596 if (*bridge_agpstat & AGPSTAT2_4X)
597 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
599 if (*bridge_agpstat & AGPSTAT2_2X)
600 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
602 if (*bridge_agpstat & AGPSTAT2_1X)
603 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
605 /* Apply any errata. */
606 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
607 *bridge_agpstat &= ~AGPSTAT_FW;
609 if (agp_bridge->flags & AGP_ERRATA_SBA)
610 *bridge_agpstat &= ~AGPSTAT_SBA;
612 if (agp_bridge->flags & AGP_ERRATA_1X) {
613 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
614 *bridge_agpstat |= AGPSTAT2_1X;
617 /* If we've dropped down to 1X, disable fast writes. */
618 if (*bridge_agpstat & AGPSTAT2_1X)
619 *bridge_agpstat &= ~AGPSTAT_FW;
623 * requested_mode = Mode requested by (typically) X.
624 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
625 * vga_agpstat = PCI_AGP_STATUS from graphic card.
627 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
629 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
632 if (*requested_mode & AGP3_RESERVED_MASK) {
633 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
634 *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
635 *requested_mode &= ~AGP3_RESERVED_MASK;
638 /* Check the speed bits make sense. */
639 tmp = *requested_mode & 7;
641 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
642 *requested_mode |= AGPSTAT3_4X;
645 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
646 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
649 /* ARQSZ - Set the value to the maximum one.
650 * Don't allow the mode register to override values. */
651 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
652 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
654 /* Calibration cycle.
655 * Don't allow the mode register to override values. */
656 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
657 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
659 /* SBA *must* be supported for AGP v3 */
660 *bridge_agpstat |= AGPSTAT_SBA;
664 * Check for invalid speeds. This can happen when applications
665 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
667 if (*requested_mode & AGPSTAT_MODE_3_0) {
669 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
670 * have been passed a 3.0 mode, but with 2.x speed bits set.
671 * AGP2.x 4x -> AGP3.0 4x.
673 if (*requested_mode & AGPSTAT2_4X) {
674 printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
675 current->comm, *requested_mode);
676 *requested_mode &= ~AGPSTAT2_4X;
677 *requested_mode |= AGPSTAT3_4X;
681 * The caller doesn't know what they are doing. We are in 3.0 mode,
682 * but have been passed an AGP 2.x mode.
683 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
685 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
686 current->comm, *requested_mode);
687 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
688 *requested_mode |= AGPSTAT3_4X;
691 if (*requested_mode & AGPSTAT3_8X) {
692 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
693 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
694 *bridge_agpstat |= AGPSTAT3_4X;
695 printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
698 if (!(*vga_agpstat & AGPSTAT3_8X)) {
699 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
700 *bridge_agpstat |= AGPSTAT3_4X;
701 printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
704 /* All set, bridge & device can do AGP x8*/
705 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
708 } else if (*requested_mode & AGPSTAT3_4X) {
709 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
710 *bridge_agpstat |= AGPSTAT3_4X;
716 * If we didn't specify an AGP mode, we see if both
717 * the graphics card, and the bridge can do x8, and use if so.
718 * If not, we fall back to x4 mode.
720 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
721 printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
722 "supported by bridge & card (x8).\n");
723 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
724 *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
726 printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
727 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
728 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
729 *bridge_agpstat, origbridge);
730 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
731 *bridge_agpstat |= AGPSTAT3_4X;
733 if (!(*vga_agpstat & AGPSTAT3_8X)) {
734 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
735 *vga_agpstat, origvga);
736 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
737 *vga_agpstat |= AGPSTAT3_4X;
743 /* Apply any errata. */
744 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
745 *bridge_agpstat &= ~AGPSTAT_FW;
747 if (agp_bridge->flags & AGP_ERRATA_SBA)
748 *bridge_agpstat &= ~AGPSTAT_SBA;
750 if (agp_bridge->flags & AGP_ERRATA_1X) {
751 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
752 *bridge_agpstat |= AGPSTAT2_1X;
758 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
759 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
760 * @requested_mode: requested agp_stat from userspace (Typically from X)
761 * @bridge_agpstat: current agp_stat from AGP bridge.
763 * This function will hunt for an AGP graphics card, and try to match
764 * the requested mode to the capabilities of both the bridge and the card.
766 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
768 struct pci_dev *device = NULL;
773 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
775 printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
778 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
784 * Ok, here we have a AGP device. Disable impossible
785 * settings, and adjust the readqueue to the minimum.
787 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
789 /* adjust RQ depth */
790 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
791 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
792 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
794 /* disable FW if it's not supported */
795 if (!((bridge_agpstat & AGPSTAT_FW) &&
796 (vga_agpstat & AGPSTAT_FW) &&
797 (requested_mode & AGPSTAT_FW)))
798 bridge_agpstat &= ~AGPSTAT_FW;
800 /* Check to see if we are operating in 3.0 mode */
801 if (agp_bridge->mode & AGPSTAT_MODE_3_0)
802 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
804 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
807 return bridge_agpstat;
809 EXPORT_SYMBOL(agp_collect_device_status);
812 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
814 struct pci_dev *device = NULL;
817 mode = bridge_agpstat & 0x7;
821 for_each_pci_dev(device) {
822 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
826 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
827 agp_v3 ? 3 : 2, mode);
828 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
831 EXPORT_SYMBOL(agp_device_command);
834 void get_agp_version(struct agp_bridge_data *bridge)
838 /* Exit early if already set by errata workarounds. */
839 if (bridge->major_version != 0)
842 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
843 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
844 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
846 EXPORT_SYMBOL(get_agp_version);
849 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
851 u32 bridge_agpstat, temp;
853 get_agp_version(agp_bridge);
855 dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
856 agp_bridge->major_version, agp_bridge->minor_version);
858 pci_read_config_dword(agp_bridge->dev,
859 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
861 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
862 if (bridge_agpstat == 0)
863 /* Something bad happened. FIXME: Return error code? */
866 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
868 /* Do AGP version specific frobbing. */
869 if (bridge->major_version >= 3) {
870 if (bridge->mode & AGPSTAT_MODE_3_0) {
871 /* If we have 3.5, we can do the isoch stuff. */
872 if (bridge->minor_version >= 5)
873 agp_3_5_enable(bridge);
874 agp_device_command(bridge_agpstat, true);
877 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
878 bridge_agpstat &= ~(7<<10) ;
879 pci_read_config_dword(bridge->dev,
880 bridge->capndx+AGPCTRL, &temp);
882 pci_write_config_dword(bridge->dev,
883 bridge->capndx+AGPCTRL, temp);
885 dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
890 agp_device_command(bridge_agpstat, false);
892 EXPORT_SYMBOL(agp_generic_enable);
895 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
906 /* The generic routines can't handle 2 level gatt's */
907 if (bridge->driver->size_type == LVL2_APER_SIZE)
911 i = bridge->aperture_size_idx;
912 temp = bridge->current_size;
913 size = page_order = num_entries = 0;
915 if (bridge->driver->size_type != FIXED_APER_SIZE) {
917 switch (bridge->driver->size_type) {
919 size = A_SIZE_8(temp)->size;
921 A_SIZE_8(temp)->page_order;
923 A_SIZE_8(temp)->num_entries;
926 size = A_SIZE_16(temp)->size;
927 page_order = A_SIZE_16(temp)->page_order;
928 num_entries = A_SIZE_16(temp)->num_entries;
931 size = A_SIZE_32(temp)->size;
932 page_order = A_SIZE_32(temp)->page_order;
933 num_entries = A_SIZE_32(temp)->num_entries;
935 /* This case will never really happen. */
936 case FIXED_APER_SIZE:
939 size = page_order = num_entries = 0;
943 table = alloc_gatt_pages(page_order);
947 switch (bridge->driver->size_type) {
949 bridge->current_size = A_IDX8(bridge);
952 bridge->current_size = A_IDX16(bridge);
955 bridge->current_size = A_IDX32(bridge);
957 /* These cases will never really happen. */
958 case FIXED_APER_SIZE:
963 temp = bridge->current_size;
965 bridge->aperture_size_idx = i;
967 } while (!table && (i < bridge->driver->num_aperture_sizes));
969 size = ((struct aper_size_info_fixed *) temp)->size;
970 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
971 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
972 table = alloc_gatt_pages(page_order);
978 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
980 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
981 SetPageReserved(page);
983 bridge->gatt_table_real = (u32 *) table;
984 agp_gatt_table = (void *)table;
986 bridge->driver->cache_flush();
988 set_memory_uc((unsigned long)table, 1 << page_order);
989 bridge->gatt_table = (void *)table;
991 bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
992 (PAGE_SIZE * (1 << page_order)));
993 bridge->driver->cache_flush();
996 if (bridge->gatt_table == NULL) {
997 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
998 ClearPageReserved(page);
1000 free_gatt_pages(table, page_order);
1004 bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
1006 /* AK: bogus, should encode addresses > 4GB */
1007 for (i = 0; i < num_entries; i++) {
1008 writel(bridge->scratch_page, bridge->gatt_table+i);
1009 readl(bridge->gatt_table+i); /* PCI Posting. */
1014 EXPORT_SYMBOL(agp_generic_create_gatt_table);
1016 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
1019 char *table, *table_end;
1023 temp = bridge->current_size;
1025 switch (bridge->driver->size_type) {
1027 page_order = A_SIZE_8(temp)->page_order;
1030 page_order = A_SIZE_16(temp)->page_order;
1033 page_order = A_SIZE_32(temp)->page_order;
1035 case FIXED_APER_SIZE:
1036 page_order = A_SIZE_FIX(temp)->page_order;
1038 case LVL2_APER_SIZE:
1039 /* The generic routines can't deal with 2 level gatt's */
1047 /* Do not worry about freeing memory, because if this is
1048 * called, then all agp memory is deallocated and removed
1049 * from the table. */
1052 set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1054 iounmap(bridge->gatt_table);
1056 table = (char *) bridge->gatt_table_real;
1057 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1059 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1060 ClearPageReserved(page);
1062 free_gatt_pages(bridge->gatt_table_real, page_order);
1064 agp_gatt_table = NULL;
1065 bridge->gatt_table = NULL;
1066 bridge->gatt_table_real = NULL;
1067 bridge->gatt_bus_addr = 0;
1071 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1074 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1080 struct agp_bridge_data *bridge;
1083 bridge = mem->bridge;
1087 if (mem->page_count == 0)
1090 temp = bridge->current_size;
1092 switch (bridge->driver->size_type) {
1094 num_entries = A_SIZE_8(temp)->num_entries;
1097 num_entries = A_SIZE_16(temp)->num_entries;
1100 num_entries = A_SIZE_32(temp)->num_entries;
1102 case FIXED_APER_SIZE:
1103 num_entries = A_SIZE_FIX(temp)->num_entries;
1105 case LVL2_APER_SIZE:
1106 /* The generic routines can't deal with 2 level gatt's */
1114 num_entries -= agp_memory_reserved/PAGE_SIZE;
1115 if (num_entries < 0) num_entries = 0;
1117 if (type != mem->type)
1120 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1121 if (mask_type != 0) {
1122 /* The generic routines know nothing of memory types */
1126 /* AK: could wrap */
1127 if ((pg_start + mem->page_count) > num_entries)
1132 while (j < (pg_start + mem->page_count)) {
1133 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1138 if (!mem->is_flushed) {
1139 bridge->driver->cache_flush();
1140 mem->is_flushed = true;
1143 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1144 writel(bridge->driver->mask_memory(bridge,
1145 page_to_phys(mem->pages[i]),
1147 bridge->gatt_table+j);
1149 readl(bridge->gatt_table+j-1); /* PCI Posting. */
1151 bridge->driver->tlb_flush(mem);
1154 EXPORT_SYMBOL(agp_generic_insert_memory);
1157 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1160 struct agp_bridge_data *bridge;
1163 bridge = mem->bridge;
1167 if (mem->page_count == 0)
1170 if (type != mem->type)
1173 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1174 if (mask_type != 0) {
1175 /* The generic routines know nothing of memory types */
1179 /* AK: bogus, should encode addresses > 4GB */
1180 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1181 writel(bridge->scratch_page, bridge->gatt_table+i);
1183 readl(bridge->gatt_table+i-1); /* PCI Posting. */
1185 bridge->driver->tlb_flush(mem);
1188 EXPORT_SYMBOL(agp_generic_remove_memory);
1190 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1194 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1196 void agp_generic_free_by_type(struct agp_memory *curr)
1198 agp_free_page_array(curr);
1199 agp_free_key(curr->key);
1202 EXPORT_SYMBOL(agp_generic_free_by_type);
1204 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1206 struct agp_memory *new;
1210 pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1211 new = agp_create_user_memory(page_count);
1215 for (i = 0; i < page_count; i++)
1217 new->page_count = 0;
1219 new->num_scratch_pages = pages;
1223 EXPORT_SYMBOL(agp_generic_alloc_user);
1226 * Basic Page Allocation Routines -
1227 * These routines handle page allocation and by default they reserve the allocated
1228 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1229 * against a maximum value.
1232 int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1235 int i, ret = -ENOMEM;
1237 for (i = 0; i < num_pages; i++) {
1238 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1239 /* agp_free_memory() needs gart address */
1244 map_page_into_agp(page);
1247 atomic_inc(&agp_bridge->current_memory_agp);
1249 mem->pages[i] = page;
1254 set_pages_array_uc(mem->pages, num_pages);
1260 EXPORT_SYMBOL(agp_generic_alloc_pages);
1262 struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1266 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1270 map_page_into_agp(page);
1273 atomic_inc(&agp_bridge->current_memory_agp);
1276 EXPORT_SYMBOL(agp_generic_alloc_page);
1278 void agp_generic_destroy_pages(struct agp_memory *mem)
1287 set_pages_array_wb(mem->pages, mem->page_count);
1290 for (i = 0; i < mem->page_count; i++) {
1291 page = mem->pages[i];
1294 unmap_page_from_agp(page);
1298 atomic_dec(&agp_bridge->current_memory_agp);
1299 mem->pages[i] = NULL;
1302 EXPORT_SYMBOL(agp_generic_destroy_pages);
1304 void agp_generic_destroy_page(struct page *page, int flags)
1309 if (flags & AGP_PAGE_DESTROY_UNMAP)
1310 unmap_page_from_agp(page);
1312 if (flags & AGP_PAGE_DESTROY_FREE) {
1315 atomic_dec(&agp_bridge->current_memory_agp);
1318 EXPORT_SYMBOL(agp_generic_destroy_page);
1320 /* End Basic Page Allocation Routines */
1324 * agp_enable - initialise the agp point-to-point connection.
1326 * @mode: agp mode register value to configure with.
1328 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1332 bridge->driver->agp_enable(bridge, mode);
1334 EXPORT_SYMBOL(agp_enable);
1336 /* When we remove the global variable agp_bridge from all drivers
1337 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1340 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1342 if (list_empty(&agp_bridges))
1348 static void ipi_handler(void *null)
1353 void global_cache_flush(void)
1355 if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1356 panic(PFX "timed out waiting for the other CPUs!\n");
1358 EXPORT_SYMBOL(global_cache_flush);
1360 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1361 dma_addr_t addr, int type)
1363 /* memory type is ignored in the generic routine */
1364 if (bridge->driver->masks)
1365 return addr | bridge->driver->masks[0].mask;
1369 EXPORT_SYMBOL(agp_generic_mask_memory);
1371 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1374 if (type >= AGP_USER_TYPES)
1378 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1381 * These functions are implemented according to the AGPv3 spec,
1382 * which covers implementation details that had previously been
1386 int agp3_generic_fetch_size(void)
1390 struct aper_size_info_16 *values;
1392 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1393 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1395 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1396 if (temp_size == values[i].size_value) {
1397 agp_bridge->previous_size =
1398 agp_bridge->current_size = (void *) (values + i);
1400 agp_bridge->aperture_size_idx = i;
1401 return values[i].size;
1406 EXPORT_SYMBOL(agp3_generic_fetch_size);
1408 void agp3_generic_tlbflush(struct agp_memory *mem)
1411 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1412 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1413 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1415 EXPORT_SYMBOL(agp3_generic_tlbflush);
1417 int agp3_generic_configure(void)
1420 struct aper_size_info_16 *current_size;
1422 current_size = A_SIZE_16(agp_bridge->current_size);
1424 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1425 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1427 /* set aperture size */
1428 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1429 /* set gart pointer */
1430 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1431 /* enable aperture and GTLB */
1432 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1433 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1436 EXPORT_SYMBOL(agp3_generic_configure);
1438 void agp3_generic_cleanup(void)
1441 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1442 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1444 EXPORT_SYMBOL(agp3_generic_cleanup);
1446 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1448 {4096, 1048576, 10,0x000},
1449 {2048, 524288, 9, 0x800},
1450 {1024, 262144, 8, 0xc00},
1451 { 512, 131072, 7, 0xe00},
1452 { 256, 65536, 6, 0xf00},
1453 { 128, 32768, 5, 0xf20},
1454 { 64, 16384, 4, 0xf30},
1455 { 32, 8192, 3, 0xf38},
1456 { 16, 4096, 2, 0xf3c},
1457 { 8, 2048, 1, 0xf3e},
1458 { 4, 1024, 0, 0xf3f}
1460 EXPORT_SYMBOL(agp3_generic_sizes);