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>
41 #include <asm/cacheflush.h>
42 #include <asm/pgtable.h>
45 __u32 *agp_gatt_table;
46 int agp_memory_reserved;
49 * Needed by the Nforce GART driver for the time being. Would be
50 * nice to do this some other way instead of needing this export.
52 EXPORT_SYMBOL_GPL(agp_memory_reserved);
54 #if defined(CONFIG_X86)
55 int map_page_into_agp(struct page *page)
58 i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
59 /* Caller's responsibility to call global_flush_tlb() for
60 * performance reasons */
63 EXPORT_SYMBOL_GPL(map_page_into_agp);
65 int unmap_page_from_agp(struct page *page)
68 i = change_page_attr(page, 1, PAGE_KERNEL);
69 /* Caller's responsibility to call global_flush_tlb() for
70 * performance reasons */
73 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
77 * Generic routines for handling agp_memory structures -
78 * They use the basic page allocation routines to do the brunt of the work.
81 void agp_free_key(int key)
87 clear_bit(key, agp_bridge->key_list);
89 EXPORT_SYMBOL(agp_free_key);
92 static int agp_get_key(void)
96 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
98 set_bit(bit, agp_bridge->key_list);
105 * Use kmalloc if possible for the page list. Otherwise fall back to
106 * vmalloc. This speeds things up and also saves memory for small AGP
110 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
113 mem->vmalloc_flag = 0;
115 if (size <= 2*PAGE_SIZE) {
116 mem->memory = kmalloc(size, GFP_KERNEL | __GFP_NORETRY);
118 if (mem->memory == NULL) {
119 mem->memory = vmalloc(size);
120 mem->vmalloc_flag = 1;
123 EXPORT_SYMBOL(agp_alloc_page_array);
125 void agp_free_page_array(struct agp_memory *mem)
127 if (mem->vmalloc_flag) {
133 EXPORT_SYMBOL(agp_free_page_array);
136 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
138 struct agp_memory *new;
139 unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
141 new = kmalloc(sizeof(struct agp_memory), GFP_KERNEL);
146 memset(new, 0, sizeof(struct agp_memory));
147 new->key = agp_get_key();
154 agp_alloc_page_array(alloc_size, new);
156 if (new->memory == NULL) {
157 agp_free_key(new->key);
161 new->num_scratch_pages = 0;
166 struct agp_memory *agp_create_memory(int scratch_pages)
168 struct agp_memory *new;
170 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
174 new->key = agp_get_key();
181 agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
183 if (new->memory == NULL) {
184 agp_free_key(new->key);
188 new->num_scratch_pages = scratch_pages;
189 new->type = AGP_NORMAL_MEMORY;
192 EXPORT_SYMBOL(agp_create_memory);
195 * agp_free_memory - free memory associated with an agp_memory pointer.
197 * @curr: agp_memory pointer to be freed.
199 * It is the only function that can be called when the backend is not owned
200 * by the caller. (So it can free memory on client death.)
202 void agp_free_memory(struct agp_memory *curr)
209 if (curr->is_bound == TRUE)
210 agp_unbind_memory(curr);
212 if (curr->type >= AGP_USER_TYPES) {
213 agp_generic_free_by_type(curr);
217 if (curr->type != 0) {
218 curr->bridge->driver->free_by_type(curr);
221 if (curr->page_count != 0) {
222 for (i = 0; i < curr->page_count; i++) {
223 curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
225 flush_agp_mappings();
227 agp_free_key(curr->key);
228 agp_free_page_array(curr);
231 EXPORT_SYMBOL(agp_free_memory);
233 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
236 * agp_allocate_memory - allocate a group of pages of a certain type.
238 * @page_count: size_t argument of the number of pages
239 * @type: u32 argument of the type of memory to be allocated.
241 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
242 * maps to physical ram. Any other type is device dependent.
244 * It returns NULL whenever memory is unavailable.
246 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
247 size_t page_count, u32 type)
250 struct agp_memory *new;
256 if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
259 if (type >= AGP_USER_TYPES) {
260 new = agp_generic_alloc_user(page_count, type);
262 new->bridge = bridge;
267 new = bridge->driver->alloc_by_type(page_count, type);
269 new->bridge = bridge;
273 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
275 new = agp_create_memory(scratch_pages);
280 for (i = 0; i < page_count; i++) {
281 void *addr = bridge->driver->agp_alloc_page(bridge);
284 agp_free_memory(new);
287 new->memory[i] = virt_to_gart(addr);
290 new->bridge = bridge;
292 flush_agp_mappings();
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 == TRUE) {
433 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
436 if (curr->is_flushed == FALSE) {
437 curr->bridge->driver->cache_flush();
438 curr->is_flushed = TRUE;
440 ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
445 curr->is_bound = TRUE;
446 curr->pg_start = pg_start;
449 EXPORT_SYMBOL(agp_bind_memory);
453 * agp_unbind_memory - Removes an agp_memory structure from the GATT
455 * @curr: agp_memory pointer to be removed from the GATT.
457 * It returns -EINVAL if this piece of agp_memory is not currently bound to
458 * the graphics aperture translation table or if the agp_memory pointer == NULL
460 int agp_unbind_memory(struct agp_memory *curr)
467 if (curr->is_bound != TRUE) {
468 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
472 ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
477 curr->is_bound = FALSE;
481 EXPORT_SYMBOL(agp_unbind_memory);
483 /* End - Routines for handling swapping of agp_memory into the GATT */
486 /* Generic Agp routines - Start */
487 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
491 if (*requested_mode & AGP2_RESERVED_MASK) {
492 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
493 *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
494 *requested_mode &= ~AGP2_RESERVED_MASK;
498 * Some dumb bridges are programmed to disobey the AGP2 spec.
499 * This is likely a BIOS misprogramming rather than poweron default, or
500 * it would be a lot more common.
501 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
502 * AGPv2 spec 6.1.9 states:
503 * The RATE field indicates the data transfer rates supported by this
504 * device. A.G.P. devices must report all that apply.
505 * Fix them up as best we can.
507 switch (*bridge_agpstat & 7) {
509 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
510 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
511 "Fixing up support for x2 & x1\n");
514 *bridge_agpstat |= AGPSTAT2_1X;
515 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
516 "Fixing up support for x1\n");
522 /* Check the speed bits make sense. Only one should be set. */
523 tmp = *requested_mode & 7;
526 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
527 *requested_mode |= AGPSTAT2_1X;
533 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
540 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
544 /* disable SBA if it's not supported */
545 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
546 *bridge_agpstat &= ~AGPSTAT_SBA;
549 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
550 *bridge_agpstat &= ~AGPSTAT2_4X;
552 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
553 *bridge_agpstat &= ~AGPSTAT2_2X;
555 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
556 *bridge_agpstat &= ~AGPSTAT2_1X;
558 /* Now we know what mode it should be, clear out the unwanted bits. */
559 if (*bridge_agpstat & AGPSTAT2_4X)
560 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
562 if (*bridge_agpstat & AGPSTAT2_2X)
563 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
565 if (*bridge_agpstat & AGPSTAT2_1X)
566 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
568 /* Apply any errata. */
569 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
570 *bridge_agpstat &= ~AGPSTAT_FW;
572 if (agp_bridge->flags & AGP_ERRATA_SBA)
573 *bridge_agpstat &= ~AGPSTAT_SBA;
575 if (agp_bridge->flags & AGP_ERRATA_1X) {
576 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
577 *bridge_agpstat |= AGPSTAT2_1X;
580 /* If we've dropped down to 1X, disable fast writes. */
581 if (*bridge_agpstat & AGPSTAT2_1X)
582 *bridge_agpstat &= ~AGPSTAT_FW;
586 * requested_mode = Mode requested by (typically) X.
587 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
588 * vga_agpstat = PCI_AGP_STATUS from graphic card.
590 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
592 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
595 if (*requested_mode & AGP3_RESERVED_MASK) {
596 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
597 *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
598 *requested_mode &= ~AGP3_RESERVED_MASK;
601 /* Check the speed bits make sense. */
602 tmp = *requested_mode & 7;
604 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
605 *requested_mode |= AGPSTAT3_4X;
608 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
609 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
612 /* ARQSZ - Set the value to the maximum one.
613 * Don't allow the mode register to override values. */
614 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
615 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
617 /* Calibration cycle.
618 * Don't allow the mode register to override values. */
619 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
620 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
622 /* SBA *must* be supported for AGP v3 */
623 *bridge_agpstat |= AGPSTAT_SBA;
627 * Check for invalid speeds. This can happen when applications
628 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
630 if (*requested_mode & AGPSTAT_MODE_3_0) {
632 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
633 * have been passed a 3.0 mode, but with 2.x speed bits set.
634 * AGP2.x 4x -> AGP3.0 4x.
636 if (*requested_mode & AGPSTAT2_4X) {
637 printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
638 current->comm, *requested_mode);
639 *requested_mode &= ~AGPSTAT2_4X;
640 *requested_mode |= AGPSTAT3_4X;
644 * The caller doesn't know what they are doing. We are in 3.0 mode,
645 * but have been passed an AGP 2.x mode.
646 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
648 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
649 current->comm, *requested_mode);
650 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
651 *requested_mode |= AGPSTAT3_4X;
654 if (*requested_mode & AGPSTAT3_8X) {
655 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
656 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
657 *bridge_agpstat |= AGPSTAT3_4X;
658 printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
661 if (!(*vga_agpstat & AGPSTAT3_8X)) {
662 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
663 *bridge_agpstat |= AGPSTAT3_4X;
664 printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
667 /* All set, bridge & device can do AGP x8*/
668 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
671 } else if (*requested_mode & AGPSTAT3_4X) {
672 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
673 *bridge_agpstat |= AGPSTAT3_4X;
679 * If we didn't specify an AGP mode, we see if both
680 * the graphics card, and the bridge can do x8, and use if so.
681 * If not, we fall back to x4 mode.
683 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
684 printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
685 "supported by bridge & card (x8).\n");
686 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
687 *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
689 printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
690 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
691 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
692 *bridge_agpstat, origbridge);
693 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
694 *bridge_agpstat |= AGPSTAT3_4X;
696 if (!(*vga_agpstat & AGPSTAT3_8X)) {
697 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
698 *vga_agpstat, origvga);
699 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
700 *vga_agpstat |= AGPSTAT3_4X;
706 /* Apply any errata. */
707 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
708 *bridge_agpstat &= ~AGPSTAT_FW;
710 if (agp_bridge->flags & AGP_ERRATA_SBA)
711 *bridge_agpstat &= ~AGPSTAT_SBA;
713 if (agp_bridge->flags & AGP_ERRATA_1X) {
714 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
715 *bridge_agpstat |= AGPSTAT2_1X;
721 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
722 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
723 * @requested_mode: requested agp_stat from userspace (Typically from X)
724 * @bridge_agpstat: current agp_stat from AGP bridge.
726 * This function will hunt for an AGP graphics card, and try to match
727 * the requested mode to the capabilities of both the bridge and the card.
729 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
731 struct pci_dev *device = NULL;
736 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
738 printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
741 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
747 * Ok, here we have a AGP device. Disable impossible
748 * settings, and adjust the readqueue to the minimum.
750 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
752 /* adjust RQ depth */
753 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
754 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
755 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
757 /* disable FW if it's not supported */
758 if (!((bridge_agpstat & AGPSTAT_FW) &&
759 (vga_agpstat & AGPSTAT_FW) &&
760 (requested_mode & AGPSTAT_FW)))
761 bridge_agpstat &= ~AGPSTAT_FW;
763 /* Check to see if we are operating in 3.0 mode */
764 if (agp_bridge->mode & AGPSTAT_MODE_3_0)
765 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
767 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
770 return bridge_agpstat;
772 EXPORT_SYMBOL(agp_collect_device_status);
775 void agp_device_command(u32 bridge_agpstat, int agp_v3)
777 struct pci_dev *device = NULL;
780 mode = bridge_agpstat & 0x7;
784 for_each_pci_dev(device) {
785 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
789 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
790 agp_v3 ? 3 : 2, pci_name(device), mode);
791 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
794 EXPORT_SYMBOL(agp_device_command);
797 void get_agp_version(struct agp_bridge_data *bridge)
801 /* Exit early if already set by errata workarounds. */
802 if (bridge->major_version != 0)
805 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
806 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
807 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
809 EXPORT_SYMBOL(get_agp_version);
812 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
814 u32 bridge_agpstat, temp;
816 get_agp_version(agp_bridge);
818 printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
819 agp_bridge->major_version,
820 agp_bridge->minor_version,
821 pci_name(agp_bridge->dev));
823 pci_read_config_dword(agp_bridge->dev,
824 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
826 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
827 if (bridge_agpstat == 0)
828 /* Something bad happened. FIXME: Return error code? */
831 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
833 /* Do AGP version specific frobbing. */
834 if (bridge->major_version >= 3) {
835 if (bridge->mode & AGPSTAT_MODE_3_0) {
836 /* If we have 3.5, we can do the isoch stuff. */
837 if (bridge->minor_version >= 5)
838 agp_3_5_enable(bridge);
839 agp_device_command(bridge_agpstat, TRUE);
842 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
843 bridge_agpstat &= ~(7<<10) ;
844 pci_read_config_dword(bridge->dev,
845 bridge->capndx+AGPCTRL, &temp);
847 pci_write_config_dword(bridge->dev,
848 bridge->capndx+AGPCTRL, temp);
850 printk(KERN_INFO PFX "Device is in legacy mode,"
851 " falling back to 2.x\n");
856 agp_device_command(bridge_agpstat, FALSE);
858 EXPORT_SYMBOL(agp_generic_enable);
861 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
872 /* The generic routines can't handle 2 level gatt's */
873 if (bridge->driver->size_type == LVL2_APER_SIZE)
877 i = bridge->aperture_size_idx;
878 temp = bridge->current_size;
879 size = page_order = num_entries = 0;
881 if (bridge->driver->size_type != FIXED_APER_SIZE) {
883 switch (bridge->driver->size_type) {
885 size = A_SIZE_8(temp)->size;
887 A_SIZE_8(temp)->page_order;
889 A_SIZE_8(temp)->num_entries;
892 size = A_SIZE_16(temp)->size;
893 page_order = A_SIZE_16(temp)->page_order;
894 num_entries = A_SIZE_16(temp)->num_entries;
897 size = A_SIZE_32(temp)->size;
898 page_order = A_SIZE_32(temp)->page_order;
899 num_entries = A_SIZE_32(temp)->num_entries;
901 /* This case will never really happen. */
902 case FIXED_APER_SIZE:
905 size = page_order = num_entries = 0;
909 table = alloc_gatt_pages(page_order);
913 switch (bridge->driver->size_type) {
915 bridge->current_size = A_IDX8(bridge);
918 bridge->current_size = A_IDX16(bridge);
921 bridge->current_size = A_IDX32(bridge);
923 /* These cases will never really happen. */
924 case FIXED_APER_SIZE:
929 temp = bridge->current_size;
931 bridge->aperture_size_idx = i;
933 } while (!table && (i < bridge->driver->num_aperture_sizes));
935 size = ((struct aper_size_info_fixed *) temp)->size;
936 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
937 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
938 table = alloc_gatt_pages(page_order);
944 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
946 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
947 SetPageReserved(page);
949 bridge->gatt_table_real = (u32 *) table;
950 agp_gatt_table = (void *)table;
952 bridge->driver->cache_flush();
953 bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
954 (PAGE_SIZE * (1 << page_order)));
955 bridge->driver->cache_flush();
957 if (bridge->gatt_table == NULL) {
958 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
959 ClearPageReserved(page);
961 free_gatt_pages(table, page_order);
965 bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
967 /* AK: bogus, should encode addresses > 4GB */
968 for (i = 0; i < num_entries; i++) {
969 writel(bridge->scratch_page, bridge->gatt_table+i);
970 readl(bridge->gatt_table+i); /* PCI Posting. */
975 EXPORT_SYMBOL(agp_generic_create_gatt_table);
977 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
980 char *table, *table_end;
984 temp = bridge->current_size;
986 switch (bridge->driver->size_type) {
988 page_order = A_SIZE_8(temp)->page_order;
991 page_order = A_SIZE_16(temp)->page_order;
994 page_order = A_SIZE_32(temp)->page_order;
996 case FIXED_APER_SIZE:
997 page_order = A_SIZE_FIX(temp)->page_order;
1000 /* The generic routines can't deal with 2 level gatt's */
1008 /* Do not worry about freeing memory, because if this is
1009 * called, then all agp memory is deallocated and removed
1010 * from the table. */
1012 iounmap(bridge->gatt_table);
1013 table = (char *) bridge->gatt_table_real;
1014 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1016 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1017 ClearPageReserved(page);
1019 free_gatt_pages(bridge->gatt_table_real, page_order);
1021 agp_gatt_table = NULL;
1022 bridge->gatt_table = NULL;
1023 bridge->gatt_table_real = NULL;
1024 bridge->gatt_bus_addr = 0;
1028 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1031 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1037 struct agp_bridge_data *bridge;
1040 bridge = mem->bridge;
1044 if (mem->page_count == 0)
1047 temp = bridge->current_size;
1049 switch (bridge->driver->size_type) {
1051 num_entries = A_SIZE_8(temp)->num_entries;
1054 num_entries = A_SIZE_16(temp)->num_entries;
1057 num_entries = A_SIZE_32(temp)->num_entries;
1059 case FIXED_APER_SIZE:
1060 num_entries = A_SIZE_FIX(temp)->num_entries;
1062 case LVL2_APER_SIZE:
1063 /* The generic routines can't deal with 2 level gatt's */
1071 num_entries -= agp_memory_reserved/PAGE_SIZE;
1072 if (num_entries < 0) num_entries = 0;
1074 if (type != mem->type) {
1078 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1079 if (mask_type != 0) {
1080 /* The generic routines know nothing of memory types */
1084 /* AK: could wrap */
1085 if ((pg_start + mem->page_count) > num_entries)
1090 while (j < (pg_start + mem->page_count)) {
1091 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1096 if (mem->is_flushed == FALSE) {
1097 bridge->driver->cache_flush();
1098 mem->is_flushed = TRUE;
1101 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1102 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mask_type),
1103 bridge->gatt_table+j);
1105 readl(bridge->gatt_table+j-1); /* PCI Posting. */
1107 bridge->driver->tlb_flush(mem);
1110 EXPORT_SYMBOL(agp_generic_insert_memory);
1113 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1116 struct agp_bridge_data *bridge;
1119 bridge = mem->bridge;
1123 if (mem->page_count == 0)
1126 if (type != mem->type)
1129 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1130 if (mask_type != 0) {
1131 /* The generic routines know nothing of memory types */
1135 /* AK: bogus, should encode addresses > 4GB */
1136 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1137 writel(bridge->scratch_page, bridge->gatt_table+i);
1139 readl(bridge->gatt_table+i-1); /* PCI Posting. */
1141 bridge->driver->tlb_flush(mem);
1144 EXPORT_SYMBOL(agp_generic_remove_memory);
1147 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1151 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1154 void agp_generic_free_by_type(struct agp_memory *curr)
1156 agp_free_page_array(curr);
1157 agp_free_key(curr->key);
1160 EXPORT_SYMBOL(agp_generic_free_by_type);
1162 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1164 struct agp_memory *new;
1168 pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1169 new = agp_create_user_memory(page_count);
1173 for (i = 0; i < page_count; i++) {
1176 new->page_count = 0;
1178 new->num_scratch_pages = pages;
1182 EXPORT_SYMBOL(agp_generic_alloc_user);
1186 * Basic Page Allocation Routines -
1187 * These routines handle page allocation and by default they reserve the allocated
1188 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1189 * against a maximum value.
1192 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1196 page = alloc_page(GFP_KERNEL | GFP_DMA32);
1200 map_page_into_agp(page);
1203 SetPageLocked(page);
1204 atomic_inc(&agp_bridge->current_memory_agp);
1205 return page_address(page);
1207 EXPORT_SYMBOL(agp_generic_alloc_page);
1210 void agp_generic_destroy_page(void *addr)
1217 page = virt_to_page(addr);
1218 unmap_page_from_agp(page);
1221 free_page((unsigned long)addr);
1222 atomic_dec(&agp_bridge->current_memory_agp);
1224 EXPORT_SYMBOL(agp_generic_destroy_page);
1226 /* End Basic Page Allocation Routines */
1230 * agp_enable - initialise the agp point-to-point connection.
1232 * @mode: agp mode register value to configure with.
1234 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1238 bridge->driver->agp_enable(bridge, mode);
1240 EXPORT_SYMBOL(agp_enable);
1242 /* When we remove the global variable agp_bridge from all drivers
1243 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1246 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1248 if (list_empty(&agp_bridges))
1254 static void ipi_handler(void *null)
1259 void global_cache_flush(void)
1261 if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1262 panic(PFX "timed out waiting for the other CPUs!\n");
1264 EXPORT_SYMBOL(global_cache_flush);
1266 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1267 unsigned long addr, int type)
1269 /* memory type is ignored in the generic routine */
1270 if (bridge->driver->masks)
1271 return addr | bridge->driver->masks[0].mask;
1275 EXPORT_SYMBOL(agp_generic_mask_memory);
1277 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1280 if (type >= AGP_USER_TYPES)
1284 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1287 * These functions are implemented according to the AGPv3 spec,
1288 * which covers implementation details that had previously been
1292 int agp3_generic_fetch_size(void)
1296 struct aper_size_info_16 *values;
1298 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1299 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1301 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1302 if (temp_size == values[i].size_value) {
1303 agp_bridge->previous_size =
1304 agp_bridge->current_size = (void *) (values + i);
1306 agp_bridge->aperture_size_idx = i;
1307 return values[i].size;
1312 EXPORT_SYMBOL(agp3_generic_fetch_size);
1314 void agp3_generic_tlbflush(struct agp_memory *mem)
1317 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1318 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1319 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1321 EXPORT_SYMBOL(agp3_generic_tlbflush);
1323 int agp3_generic_configure(void)
1326 struct aper_size_info_16 *current_size;
1328 current_size = A_SIZE_16(agp_bridge->current_size);
1330 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1331 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1333 /* set aperture size */
1334 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1335 /* set gart pointer */
1336 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1337 /* enable aperture and GTLB */
1338 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1339 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1342 EXPORT_SYMBOL(agp3_generic_configure);
1344 void agp3_generic_cleanup(void)
1347 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1348 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1350 EXPORT_SYMBOL(agp3_generic_cleanup);
1352 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1354 {4096, 1048576, 10,0x000},
1355 {2048, 524288, 9, 0x800},
1356 {1024, 262144, 8, 0xc00},
1357 { 512, 131072, 7, 0xe00},
1358 { 256, 65536, 6, 0xf00},
1359 { 128, 32768, 5, 0xf20},
1360 { 64, 16384, 4, 0xf30},
1361 { 32, 8192, 3, 0xf38},
1362 { 16, 4096, 2, 0xf3c},
1363 { 8, 2048, 1, 0xf3e},
1364 { 4, 1024, 0, 0xf3f}
1366 EXPORT_SYMBOL(agp3_generic_sizes);