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/pagemap.h>
33 #include <linux/miscdevice.h>
35 #include <linux/agp_backend.h>
36 #include <linux/vmalloc.h>
37 #include <linux/dma-mapping.h>
39 #include <linux/sched.h>
40 #include <linux/slab.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)
93 if (size <= 2*PAGE_SIZE)
94 mem->pages = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
95 if (mem->pages == NULL) {
96 mem->pages = vmalloc(size);
99 EXPORT_SYMBOL(agp_alloc_page_array);
101 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
103 struct agp_memory *new;
104 unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
106 if (INT_MAX/sizeof(struct page *) < num_agp_pages)
109 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
113 new->key = agp_get_key();
120 agp_alloc_page_array(alloc_size, new);
122 if (new->pages == NULL) {
123 agp_free_key(new->key);
127 new->num_scratch_pages = 0;
131 struct agp_memory *agp_create_memory(int scratch_pages)
133 struct agp_memory *new;
135 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
139 new->key = agp_get_key();
146 agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
148 if (new->pages == NULL) {
149 agp_free_key(new->key);
153 new->num_scratch_pages = scratch_pages;
154 new->type = AGP_NORMAL_MEMORY;
157 EXPORT_SYMBOL(agp_create_memory);
160 * agp_free_memory - free memory associated with an agp_memory pointer.
162 * @curr: agp_memory pointer to be freed.
164 * It is the only function that can be called when the backend is not owned
165 * by the caller. (So it can free memory on client death.)
167 void agp_free_memory(struct agp_memory *curr)
175 agp_unbind_memory(curr);
177 if (curr->type >= AGP_USER_TYPES) {
178 agp_generic_free_by_type(curr);
182 if (curr->type != 0) {
183 curr->bridge->driver->free_by_type(curr);
186 if (curr->page_count != 0) {
187 if (curr->bridge->driver->agp_destroy_pages) {
188 curr->bridge->driver->agp_destroy_pages(curr);
191 for (i = 0; i < curr->page_count; i++) {
192 curr->bridge->driver->agp_destroy_page(
194 AGP_PAGE_DESTROY_UNMAP);
196 for (i = 0; i < curr->page_count; i++) {
197 curr->bridge->driver->agp_destroy_page(
199 AGP_PAGE_DESTROY_FREE);
203 agp_free_key(curr->key);
204 agp_free_page_array(curr);
207 EXPORT_SYMBOL(agp_free_memory);
209 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
212 * agp_allocate_memory - allocate a group of pages of a certain type.
214 * @page_count: size_t argument of the number of pages
215 * @type: u32 argument of the type of memory to be allocated.
217 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
218 * maps to physical ram. Any other type is device dependent.
220 * It returns NULL whenever memory is unavailable.
222 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
223 size_t page_count, u32 type)
226 struct agp_memory *new;
233 cur_memory = atomic_read(&bridge->current_memory_agp);
234 if ((cur_memory + page_count > bridge->max_memory_agp) ||
235 (cur_memory + page_count < page_count))
238 if (type >= AGP_USER_TYPES) {
239 new = agp_generic_alloc_user(page_count, type);
241 new->bridge = bridge;
246 new = bridge->driver->alloc_by_type(page_count, type);
248 new->bridge = bridge;
252 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
254 new = agp_create_memory(scratch_pages);
259 if (bridge->driver->agp_alloc_pages) {
260 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
261 agp_free_memory(new);
264 new->bridge = bridge;
268 for (i = 0; i < page_count; i++) {
269 struct page *page = bridge->driver->agp_alloc_page(bridge);
272 agp_free_memory(new);
275 new->pages[i] = page;
278 new->bridge = bridge;
282 EXPORT_SYMBOL(agp_allocate_memory);
285 /* End - Generic routines for handling agp_memory structures */
288 static int agp_return_size(void)
293 temp = agp_bridge->current_size;
295 switch (agp_bridge->driver->size_type) {
297 current_size = A_SIZE_8(temp)->size;
300 current_size = A_SIZE_16(temp)->size;
303 current_size = A_SIZE_32(temp)->size;
306 current_size = A_SIZE_LVL2(temp)->size;
308 case FIXED_APER_SIZE:
309 current_size = A_SIZE_FIX(temp)->size;
316 current_size -= (agp_memory_reserved / (1024*1024));
323 int agp_num_entries(void)
328 temp = agp_bridge->current_size;
330 switch (agp_bridge->driver->size_type) {
332 num_entries = A_SIZE_8(temp)->num_entries;
335 num_entries = A_SIZE_16(temp)->num_entries;
338 num_entries = A_SIZE_32(temp)->num_entries;
341 num_entries = A_SIZE_LVL2(temp)->num_entries;
343 case FIXED_APER_SIZE:
344 num_entries = A_SIZE_FIX(temp)->num_entries;
351 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
356 EXPORT_SYMBOL_GPL(agp_num_entries);
360 * agp_copy_info - copy bridge state information
362 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
364 * This function copies information about the agp bridge device and the state of
365 * the agp backend into an agp_kern_info pointer.
367 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
369 memset(info, 0, sizeof(struct agp_kern_info));
371 info->chipset = NOT_SUPPORTED;
375 info->version.major = bridge->version->major;
376 info->version.minor = bridge->version->minor;
377 info->chipset = SUPPORTED;
378 info->device = bridge->dev;
379 if (bridge->mode & AGPSTAT_MODE_3_0)
380 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
382 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
383 info->aper_base = bridge->gart_bus_addr;
384 info->aper_size = agp_return_size();
385 info->max_memory = bridge->max_memory_agp;
386 info->current_memory = atomic_read(&bridge->current_memory_agp);
387 info->cant_use_aperture = bridge->driver->cant_use_aperture;
388 info->vm_ops = bridge->vm_ops;
389 info->page_mask = ~0UL;
392 EXPORT_SYMBOL(agp_copy_info);
394 /* End - Routine to copy over information structure */
397 * Routines for handling swapping of agp_memory into the GATT -
398 * These routines take agp_memory and insert them into the GATT.
399 * They call device specific routines to actually write to the GATT.
403 * agp_bind_memory - Bind an agp_memory structure into the GATT.
405 * @curr: agp_memory pointer
406 * @pg_start: an offset into the graphics aperture translation table
408 * It returns -EINVAL if the pointer == NULL.
409 * It returns -EBUSY if the area of the table requested is already in use.
411 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
418 if (curr->is_bound) {
419 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
422 if (!curr->is_flushed) {
423 curr->bridge->driver->cache_flush();
424 curr->is_flushed = true;
427 ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
432 curr->is_bound = true;
433 curr->pg_start = pg_start;
434 spin_lock(&agp_bridge->mapped_lock);
435 list_add(&curr->mapped_list, &agp_bridge->mapped_list);
436 spin_unlock(&agp_bridge->mapped_lock);
440 EXPORT_SYMBOL(agp_bind_memory);
444 * agp_unbind_memory - Removes an agp_memory structure from the GATT
446 * @curr: agp_memory pointer to be removed from the GATT.
448 * It returns -EINVAL if this piece of agp_memory is not currently bound to
449 * the graphics aperture translation table or if the agp_memory pointer == NULL
451 int agp_unbind_memory(struct agp_memory *curr)
458 if (!curr->is_bound) {
459 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
463 ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
468 curr->is_bound = false;
470 spin_lock(&curr->bridge->mapped_lock);
471 list_del(&curr->mapped_list);
472 spin_unlock(&curr->bridge->mapped_lock);
475 EXPORT_SYMBOL(agp_unbind_memory);
478 /* End - Routines for handling swapping of agp_memory into the GATT */
481 /* Generic Agp routines - Start */
482 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
486 if (*requested_mode & AGP2_RESERVED_MASK) {
487 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
488 *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
489 *requested_mode &= ~AGP2_RESERVED_MASK;
493 * Some dumb bridges are programmed to disobey the AGP2 spec.
494 * This is likely a BIOS misprogramming rather than poweron default, or
495 * it would be a lot more common.
496 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
497 * AGPv2 spec 6.1.9 states:
498 * The RATE field indicates the data transfer rates supported by this
499 * device. A.G.P. devices must report all that apply.
500 * Fix them up as best we can.
502 switch (*bridge_agpstat & 7) {
504 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
505 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate. "
506 "Fixing up support for x2 & x1\n");
509 *bridge_agpstat |= AGPSTAT2_1X;
510 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate. "
511 "Fixing up support for x1\n");
517 /* Check the speed bits make sense. Only one should be set. */
518 tmp = *requested_mode & 7;
521 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
522 *requested_mode |= AGPSTAT2_1X;
528 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
535 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
539 /* disable SBA if it's not supported */
540 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
541 *bridge_agpstat &= ~AGPSTAT_SBA;
544 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
545 *bridge_agpstat &= ~AGPSTAT2_4X;
547 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
548 *bridge_agpstat &= ~AGPSTAT2_2X;
550 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
551 *bridge_agpstat &= ~AGPSTAT2_1X;
553 /* Now we know what mode it should be, clear out the unwanted bits. */
554 if (*bridge_agpstat & AGPSTAT2_4X)
555 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
557 if (*bridge_agpstat & AGPSTAT2_2X)
558 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
560 if (*bridge_agpstat & AGPSTAT2_1X)
561 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
563 /* Apply any errata. */
564 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
565 *bridge_agpstat &= ~AGPSTAT_FW;
567 if (agp_bridge->flags & AGP_ERRATA_SBA)
568 *bridge_agpstat &= ~AGPSTAT_SBA;
570 if (agp_bridge->flags & AGP_ERRATA_1X) {
571 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
572 *bridge_agpstat |= AGPSTAT2_1X;
575 /* If we've dropped down to 1X, disable fast writes. */
576 if (*bridge_agpstat & AGPSTAT2_1X)
577 *bridge_agpstat &= ~AGPSTAT_FW;
581 * requested_mode = Mode requested by (typically) X.
582 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
583 * vga_agpstat = PCI_AGP_STATUS from graphic card.
585 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
587 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
590 if (*requested_mode & AGP3_RESERVED_MASK) {
591 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
592 *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
593 *requested_mode &= ~AGP3_RESERVED_MASK;
596 /* Check the speed bits make sense. */
597 tmp = *requested_mode & 7;
599 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
600 *requested_mode |= AGPSTAT3_4X;
603 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
604 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
607 /* ARQSZ - Set the value to the maximum one.
608 * Don't allow the mode register to override values. */
609 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
610 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
612 /* Calibration cycle.
613 * Don't allow the mode register to override values. */
614 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
615 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
617 /* SBA *must* be supported for AGP v3 */
618 *bridge_agpstat |= AGPSTAT_SBA;
622 * Check for invalid speeds. This can happen when applications
623 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
625 if (*requested_mode & AGPSTAT_MODE_3_0) {
627 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
628 * have been passed a 3.0 mode, but with 2.x speed bits set.
629 * AGP2.x 4x -> AGP3.0 4x.
631 if (*requested_mode & AGPSTAT2_4X) {
632 printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
633 current->comm, *requested_mode);
634 *requested_mode &= ~AGPSTAT2_4X;
635 *requested_mode |= AGPSTAT3_4X;
639 * The caller doesn't know what they are doing. We are in 3.0 mode,
640 * but have been passed an AGP 2.x mode.
641 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
643 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
644 current->comm, *requested_mode);
645 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
646 *requested_mode |= AGPSTAT3_4X;
649 if (*requested_mode & AGPSTAT3_8X) {
650 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
651 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
652 *bridge_agpstat |= AGPSTAT3_4X;
653 printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
656 if (!(*vga_agpstat & AGPSTAT3_8X)) {
657 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
658 *bridge_agpstat |= AGPSTAT3_4X;
659 printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
662 /* All set, bridge & device can do AGP x8*/
663 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
666 } else if (*requested_mode & AGPSTAT3_4X) {
667 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
668 *bridge_agpstat |= AGPSTAT3_4X;
674 * If we didn't specify an AGP mode, we see if both
675 * the graphics card, and the bridge can do x8, and use if so.
676 * If not, we fall back to x4 mode.
678 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
679 printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
680 "supported by bridge & card (x8).\n");
681 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
682 *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
684 printk(KERN_INFO PFX "Fell back to AGPx4 mode because ");
685 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
686 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
687 *bridge_agpstat, origbridge);
688 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
689 *bridge_agpstat |= AGPSTAT3_4X;
691 if (!(*vga_agpstat & AGPSTAT3_8X)) {
692 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
693 *vga_agpstat, origvga);
694 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
695 *vga_agpstat |= AGPSTAT3_4X;
701 /* Apply any errata. */
702 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
703 *bridge_agpstat &= ~AGPSTAT_FW;
705 if (agp_bridge->flags & AGP_ERRATA_SBA)
706 *bridge_agpstat &= ~AGPSTAT_SBA;
708 if (agp_bridge->flags & AGP_ERRATA_1X) {
709 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
710 *bridge_agpstat |= AGPSTAT2_1X;
716 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
717 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
718 * @requested_mode: requested agp_stat from userspace (Typically from X)
719 * @bridge_agpstat: current agp_stat from AGP bridge.
721 * This function will hunt for an AGP graphics card, and try to match
722 * the requested mode to the capabilities of both the bridge and the card.
724 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
726 struct pci_dev *device = NULL;
731 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
733 printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
736 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
742 * Ok, here we have a AGP device. Disable impossible
743 * settings, and adjust the readqueue to the minimum.
745 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
747 /* adjust RQ depth */
748 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
749 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
750 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
752 /* disable FW if it's not supported */
753 if (!((bridge_agpstat & AGPSTAT_FW) &&
754 (vga_agpstat & AGPSTAT_FW) &&
755 (requested_mode & AGPSTAT_FW)))
756 bridge_agpstat &= ~AGPSTAT_FW;
758 /* Check to see if we are operating in 3.0 mode */
759 if (agp_bridge->mode & AGPSTAT_MODE_3_0)
760 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
762 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
765 return bridge_agpstat;
767 EXPORT_SYMBOL(agp_collect_device_status);
770 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
772 struct pci_dev *device = NULL;
775 mode = bridge_agpstat & 0x7;
779 for_each_pci_dev(device) {
780 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
784 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
785 agp_v3 ? 3 : 2, mode);
786 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
789 EXPORT_SYMBOL(agp_device_command);
792 void get_agp_version(struct agp_bridge_data *bridge)
796 /* Exit early if already set by errata workarounds. */
797 if (bridge->major_version != 0)
800 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
801 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
802 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
804 EXPORT_SYMBOL(get_agp_version);
807 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
809 u32 bridge_agpstat, temp;
811 get_agp_version(agp_bridge);
813 dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
814 agp_bridge->major_version, agp_bridge->minor_version);
816 pci_read_config_dword(agp_bridge->dev,
817 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
819 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
820 if (bridge_agpstat == 0)
821 /* Something bad happened. FIXME: Return error code? */
824 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
826 /* Do AGP version specific frobbing. */
827 if (bridge->major_version >= 3) {
828 if (bridge->mode & AGPSTAT_MODE_3_0) {
829 /* If we have 3.5, we can do the isoch stuff. */
830 if (bridge->minor_version >= 5)
831 agp_3_5_enable(bridge);
832 agp_device_command(bridge_agpstat, true);
835 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
836 bridge_agpstat &= ~(7<<10) ;
837 pci_read_config_dword(bridge->dev,
838 bridge->capndx+AGPCTRL, &temp);
840 pci_write_config_dword(bridge->dev,
841 bridge->capndx+AGPCTRL, temp);
843 dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
848 agp_device_command(bridge_agpstat, false);
850 EXPORT_SYMBOL(agp_generic_enable);
853 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
864 /* The generic routines can't handle 2 level gatt's */
865 if (bridge->driver->size_type == LVL2_APER_SIZE)
869 i = bridge->aperture_size_idx;
870 temp = bridge->current_size;
871 size = page_order = num_entries = 0;
873 if (bridge->driver->size_type != FIXED_APER_SIZE) {
875 switch (bridge->driver->size_type) {
877 size = A_SIZE_8(temp)->size;
879 A_SIZE_8(temp)->page_order;
881 A_SIZE_8(temp)->num_entries;
884 size = A_SIZE_16(temp)->size;
885 page_order = A_SIZE_16(temp)->page_order;
886 num_entries = A_SIZE_16(temp)->num_entries;
889 size = A_SIZE_32(temp)->size;
890 page_order = A_SIZE_32(temp)->page_order;
891 num_entries = A_SIZE_32(temp)->num_entries;
893 /* This case will never really happen. */
894 case FIXED_APER_SIZE:
897 size = page_order = num_entries = 0;
901 table = alloc_gatt_pages(page_order);
905 switch (bridge->driver->size_type) {
907 bridge->current_size = A_IDX8(bridge);
910 bridge->current_size = A_IDX16(bridge);
913 bridge->current_size = A_IDX32(bridge);
915 /* These cases will never really happen. */
916 case FIXED_APER_SIZE:
921 temp = bridge->current_size;
923 bridge->aperture_size_idx = i;
925 } while (!table && (i < bridge->driver->num_aperture_sizes));
927 size = ((struct aper_size_info_fixed *) temp)->size;
928 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
929 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
930 table = alloc_gatt_pages(page_order);
936 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
938 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
939 SetPageReserved(page);
941 bridge->gatt_table_real = (u32 *) table;
942 agp_gatt_table = (void *)table;
944 bridge->driver->cache_flush();
946 if (set_memory_uc((unsigned long)table, 1 << page_order))
947 printk(KERN_WARNING "Could not set GATT table memory to UC!\n");
949 bridge->gatt_table = (u32 __iomem *)table;
951 bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
952 (PAGE_SIZE * (1 << page_order)));
953 bridge->driver->cache_flush();
956 if (bridge->gatt_table == NULL) {
957 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
958 ClearPageReserved(page);
960 free_gatt_pages(table, page_order);
964 bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
966 /* AK: bogus, should encode addresses > 4GB */
967 for (i = 0; i < num_entries; i++) {
968 writel(bridge->scratch_page, bridge->gatt_table+i);
969 readl(bridge->gatt_table+i); /* PCI Posting. */
974 EXPORT_SYMBOL(agp_generic_create_gatt_table);
976 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
979 char *table, *table_end;
983 temp = bridge->current_size;
985 switch (bridge->driver->size_type) {
987 page_order = A_SIZE_8(temp)->page_order;
990 page_order = A_SIZE_16(temp)->page_order;
993 page_order = A_SIZE_32(temp)->page_order;
995 case FIXED_APER_SIZE:
996 page_order = A_SIZE_FIX(temp)->page_order;
999 /* The generic routines can't deal with 2 level gatt's */
1006 /* Do not worry about freeing memory, because if this is
1007 * called, then all agp memory is deallocated and removed
1008 * from the table. */
1011 set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1013 iounmap(bridge->gatt_table);
1015 table = (char *) bridge->gatt_table_real;
1016 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1018 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1019 ClearPageReserved(page);
1021 free_gatt_pages(bridge->gatt_table_real, page_order);
1023 agp_gatt_table = NULL;
1024 bridge->gatt_table = NULL;
1025 bridge->gatt_table_real = NULL;
1026 bridge->gatt_bus_addr = 0;
1030 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1033 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1039 struct agp_bridge_data *bridge;
1042 bridge = mem->bridge;
1046 if (mem->page_count == 0)
1049 temp = bridge->current_size;
1051 switch (bridge->driver->size_type) {
1053 num_entries = A_SIZE_8(temp)->num_entries;
1056 num_entries = A_SIZE_16(temp)->num_entries;
1059 num_entries = A_SIZE_32(temp)->num_entries;
1061 case FIXED_APER_SIZE:
1062 num_entries = A_SIZE_FIX(temp)->num_entries;
1064 case LVL2_APER_SIZE:
1065 /* The generic routines can't deal with 2 level gatt's */
1072 num_entries -= agp_memory_reserved/PAGE_SIZE;
1073 if (num_entries < 0) num_entries = 0;
1075 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 if (((pg_start + mem->page_count) > num_entries) ||
1085 ((pg_start + mem->page_count) < pg_start))
1090 while (j < (pg_start + mem->page_count)) {
1091 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1096 if (!mem->is_flushed) {
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,
1103 page_to_phys(mem->pages[i]),
1105 bridge->gatt_table+j);
1107 readl(bridge->gatt_table+j-1); /* PCI Posting. */
1109 bridge->driver->tlb_flush(mem);
1112 EXPORT_SYMBOL(agp_generic_insert_memory);
1115 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1118 struct agp_bridge_data *bridge;
1119 int mask_type, num_entries;
1121 bridge = mem->bridge;
1125 if (mem->page_count == 0)
1128 if (type != mem->type)
1131 num_entries = agp_num_entries();
1132 if (((pg_start + mem->page_count) > num_entries) ||
1133 ((pg_start + mem->page_count) < pg_start))
1136 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1137 if (mask_type != 0) {
1138 /* The generic routines know nothing of memory types */
1142 /* AK: bogus, should encode addresses > 4GB */
1143 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1144 writel(bridge->scratch_page, bridge->gatt_table+i);
1146 readl(bridge->gatt_table+i-1); /* PCI Posting. */
1148 bridge->driver->tlb_flush(mem);
1151 EXPORT_SYMBOL(agp_generic_remove_memory);
1153 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1157 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1159 void agp_generic_free_by_type(struct agp_memory *curr)
1161 agp_free_page_array(curr);
1162 agp_free_key(curr->key);
1165 EXPORT_SYMBOL(agp_generic_free_by_type);
1167 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1169 struct agp_memory *new;
1173 pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1174 new = agp_create_user_memory(page_count);
1178 for (i = 0; i < page_count; i++)
1179 new->pages[i] = NULL;
1180 new->page_count = 0;
1182 new->num_scratch_pages = pages;
1186 EXPORT_SYMBOL(agp_generic_alloc_user);
1189 * Basic Page Allocation Routines -
1190 * These routines handle page allocation and by default they reserve the allocated
1191 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1192 * against a maximum value.
1195 int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1198 int i, ret = -ENOMEM;
1200 for (i = 0; i < num_pages; i++) {
1201 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1202 /* agp_free_memory() needs gart address */
1207 map_page_into_agp(page);
1210 atomic_inc(&agp_bridge->current_memory_agp);
1212 mem->pages[i] = page;
1217 set_pages_array_uc(mem->pages, num_pages);
1223 EXPORT_SYMBOL(agp_generic_alloc_pages);
1225 struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1229 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1233 map_page_into_agp(page);
1236 atomic_inc(&agp_bridge->current_memory_agp);
1239 EXPORT_SYMBOL(agp_generic_alloc_page);
1241 void agp_generic_destroy_pages(struct agp_memory *mem)
1250 set_pages_array_wb(mem->pages, mem->page_count);
1253 for (i = 0; i < mem->page_count; i++) {
1254 page = mem->pages[i];
1257 unmap_page_from_agp(page);
1261 atomic_dec(&agp_bridge->current_memory_agp);
1262 mem->pages[i] = NULL;
1265 EXPORT_SYMBOL(agp_generic_destroy_pages);
1267 void agp_generic_destroy_page(struct page *page, int flags)
1272 if (flags & AGP_PAGE_DESTROY_UNMAP)
1273 unmap_page_from_agp(page);
1275 if (flags & AGP_PAGE_DESTROY_FREE) {
1278 atomic_dec(&agp_bridge->current_memory_agp);
1281 EXPORT_SYMBOL(agp_generic_destroy_page);
1283 /* End Basic Page Allocation Routines */
1287 * agp_enable - initialise the agp point-to-point connection.
1289 * @mode: agp mode register value to configure with.
1291 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1295 bridge->driver->agp_enable(bridge, mode);
1297 EXPORT_SYMBOL(agp_enable);
1299 /* When we remove the global variable agp_bridge from all drivers
1300 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1303 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1305 if (list_empty(&agp_bridges))
1311 static void ipi_handler(void *null)
1316 void global_cache_flush(void)
1318 if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1319 panic(PFX "timed out waiting for the other CPUs!\n");
1321 EXPORT_SYMBOL(global_cache_flush);
1323 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1324 dma_addr_t addr, int type)
1326 /* memory type is ignored in the generic routine */
1327 if (bridge->driver->masks)
1328 return addr | bridge->driver->masks[0].mask;
1332 EXPORT_SYMBOL(agp_generic_mask_memory);
1334 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1337 if (type >= AGP_USER_TYPES)
1341 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1344 * These functions are implemented according to the AGPv3 spec,
1345 * which covers implementation details that had previously been
1349 int agp3_generic_fetch_size(void)
1353 struct aper_size_info_16 *values;
1355 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1356 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1358 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1359 if (temp_size == values[i].size_value) {
1360 agp_bridge->previous_size =
1361 agp_bridge->current_size = (void *) (values + i);
1363 agp_bridge->aperture_size_idx = i;
1364 return values[i].size;
1369 EXPORT_SYMBOL(agp3_generic_fetch_size);
1371 void agp3_generic_tlbflush(struct agp_memory *mem)
1374 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1375 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1376 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1378 EXPORT_SYMBOL(agp3_generic_tlbflush);
1380 int agp3_generic_configure(void)
1383 struct aper_size_info_16 *current_size;
1385 current_size = A_SIZE_16(agp_bridge->current_size);
1387 agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
1390 /* set aperture size */
1391 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1392 /* set gart pointer */
1393 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1394 /* enable aperture and GTLB */
1395 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1396 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1399 EXPORT_SYMBOL(agp3_generic_configure);
1401 void agp3_generic_cleanup(void)
1404 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1405 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1407 EXPORT_SYMBOL(agp3_generic_cleanup);
1409 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1411 {4096, 1048576, 10,0x000},
1412 {2048, 524288, 9, 0x800},
1413 {1024, 262144, 8, 0xc00},
1414 { 512, 131072, 7, 0xe00},
1415 { 256, 65536, 6, 0xf00},
1416 { 128, 32768, 5, 0xf20},
1417 { 64, 16384, 4, 0xf30},
1418 { 32, 8192, 3, 0xf38},
1419 { 16, 4096, 2, 0xf3c},
1420 { 8, 2048, 1, 0xf3e},
1421 { 4, 1024, 0, 0xf3f}
1423 EXPORT_SYMBOL(agp3_generic_sizes);