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>
43 #include <asm/set_memory.h>
45 #include <asm/pgtable.h>
48 __u32 *agp_gatt_table;
49 int agp_memory_reserved;
52 * Needed by the Nforce GART driver for the time being. Would be
53 * nice to do this some other way instead of needing this export.
55 EXPORT_SYMBOL_GPL(agp_memory_reserved);
58 * Generic routines for handling agp_memory structures -
59 * They use the basic page allocation routines to do the brunt of the work.
62 void agp_free_key(int key)
68 clear_bit(key, agp_bridge->key_list);
70 EXPORT_SYMBOL(agp_free_key);
73 static int agp_get_key(void)
77 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
79 set_bit(bit, agp_bridge->key_list);
86 * Use kmalloc if possible for the page list. Otherwise fall back to
87 * vmalloc. This speeds things up and also saves memory for small AGP
91 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
93 mem->pages = kvmalloc(size, GFP_KERNEL);
95 EXPORT_SYMBOL(agp_alloc_page_array);
97 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
99 struct agp_memory *new;
100 unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
102 if (INT_MAX/sizeof(struct page *) < num_agp_pages)
105 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
109 new->key = agp_get_key();
116 agp_alloc_page_array(alloc_size, new);
118 if (new->pages == NULL) {
119 agp_free_key(new->key);
123 new->num_scratch_pages = 0;
127 struct agp_memory *agp_create_memory(int scratch_pages)
129 struct agp_memory *new;
131 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
135 new->key = agp_get_key();
142 agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
144 if (new->pages == NULL) {
145 agp_free_key(new->key);
149 new->num_scratch_pages = scratch_pages;
150 new->type = AGP_NORMAL_MEMORY;
153 EXPORT_SYMBOL(agp_create_memory);
156 * agp_free_memory - free memory associated with an agp_memory pointer.
158 * @curr: agp_memory pointer to be freed.
160 * It is the only function that can be called when the backend is not owned
161 * by the caller. (So it can free memory on client death.)
163 void agp_free_memory(struct agp_memory *curr)
171 agp_unbind_memory(curr);
173 if (curr->type >= AGP_USER_TYPES) {
174 agp_generic_free_by_type(curr);
178 if (curr->type != 0) {
179 curr->bridge->driver->free_by_type(curr);
182 if (curr->page_count != 0) {
183 if (curr->bridge->driver->agp_destroy_pages) {
184 curr->bridge->driver->agp_destroy_pages(curr);
187 for (i = 0; i < curr->page_count; i++) {
188 curr->bridge->driver->agp_destroy_page(
190 AGP_PAGE_DESTROY_UNMAP);
192 for (i = 0; i < curr->page_count; i++) {
193 curr->bridge->driver->agp_destroy_page(
195 AGP_PAGE_DESTROY_FREE);
199 agp_free_key(curr->key);
200 agp_free_page_array(curr);
203 EXPORT_SYMBOL(agp_free_memory);
205 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
208 * agp_allocate_memory - allocate a group of pages of a certain type.
210 * @page_count: size_t argument of the number of pages
211 * @type: u32 argument of the type of memory to be allocated.
213 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
214 * maps to physical ram. Any other type is device dependent.
216 * It returns NULL whenever memory is unavailable.
218 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
219 size_t page_count, u32 type)
222 struct agp_memory *new;
229 cur_memory = atomic_read(&bridge->current_memory_agp);
230 if ((cur_memory + page_count > bridge->max_memory_agp) ||
231 (cur_memory + page_count < page_count))
234 if (type >= AGP_USER_TYPES) {
235 new = agp_generic_alloc_user(page_count, type);
237 new->bridge = bridge;
242 new = bridge->driver->alloc_by_type(page_count, type);
244 new->bridge = bridge;
248 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
250 new = agp_create_memory(scratch_pages);
255 if (bridge->driver->agp_alloc_pages) {
256 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
257 agp_free_memory(new);
260 new->bridge = bridge;
264 for (i = 0; i < page_count; i++) {
265 struct page *page = bridge->driver->agp_alloc_page(bridge);
268 agp_free_memory(new);
271 new->pages[i] = page;
274 new->bridge = bridge;
278 EXPORT_SYMBOL(agp_allocate_memory);
281 /* End - Generic routines for handling agp_memory structures */
284 static int agp_return_size(void)
289 temp = agp_bridge->current_size;
291 switch (agp_bridge->driver->size_type) {
293 current_size = A_SIZE_8(temp)->size;
296 current_size = A_SIZE_16(temp)->size;
299 current_size = A_SIZE_32(temp)->size;
302 current_size = A_SIZE_LVL2(temp)->size;
304 case FIXED_APER_SIZE:
305 current_size = A_SIZE_FIX(temp)->size;
312 current_size -= (agp_memory_reserved / (1024*1024));
319 int agp_num_entries(void)
324 temp = agp_bridge->current_size;
326 switch (agp_bridge->driver->size_type) {
328 num_entries = A_SIZE_8(temp)->num_entries;
331 num_entries = A_SIZE_16(temp)->num_entries;
334 num_entries = A_SIZE_32(temp)->num_entries;
337 num_entries = A_SIZE_LVL2(temp)->num_entries;
339 case FIXED_APER_SIZE:
340 num_entries = A_SIZE_FIX(temp)->num_entries;
347 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
352 EXPORT_SYMBOL_GPL(agp_num_entries);
356 * agp_copy_info - copy bridge state information
358 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
360 * This function copies information about the agp bridge device and the state of
361 * the agp backend into an agp_kern_info pointer.
363 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
365 memset(info, 0, sizeof(struct agp_kern_info));
367 info->chipset = NOT_SUPPORTED;
371 info->version.major = bridge->version->major;
372 info->version.minor = bridge->version->minor;
373 info->chipset = SUPPORTED;
374 info->device = bridge->dev;
375 if (bridge->mode & AGPSTAT_MODE_3_0)
376 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
378 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
379 info->aper_base = bridge->gart_bus_addr;
380 info->aper_size = agp_return_size();
381 info->max_memory = bridge->max_memory_agp;
382 info->current_memory = atomic_read(&bridge->current_memory_agp);
383 info->cant_use_aperture = bridge->driver->cant_use_aperture;
384 info->vm_ops = bridge->vm_ops;
385 info->page_mask = ~0UL;
388 EXPORT_SYMBOL(agp_copy_info);
390 /* End - Routine to copy over information structure */
393 * Routines for handling swapping of agp_memory into the GATT -
394 * These routines take agp_memory and insert them into the GATT.
395 * They call device specific routines to actually write to the GATT.
399 * agp_bind_memory - Bind an agp_memory structure into the GATT.
401 * @curr: agp_memory pointer
402 * @pg_start: an offset into the graphics aperture translation table
404 * It returns -EINVAL if the pointer == NULL.
405 * It returns -EBUSY if the area of the table requested is already in use.
407 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
414 if (curr->is_bound) {
415 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
418 if (!curr->is_flushed) {
419 curr->bridge->driver->cache_flush();
420 curr->is_flushed = true;
423 ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
428 curr->is_bound = true;
429 curr->pg_start = pg_start;
430 spin_lock(&agp_bridge->mapped_lock);
431 list_add(&curr->mapped_list, &agp_bridge->mapped_list);
432 spin_unlock(&agp_bridge->mapped_lock);
436 EXPORT_SYMBOL(agp_bind_memory);
440 * agp_unbind_memory - Removes an agp_memory structure from the GATT
442 * @curr: agp_memory pointer to be removed from the GATT.
444 * It returns -EINVAL if this piece of agp_memory is not currently bound to
445 * the graphics aperture translation table or if the agp_memory pointer == NULL
447 int agp_unbind_memory(struct agp_memory *curr)
454 if (!curr->is_bound) {
455 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
459 ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
464 curr->is_bound = false;
466 spin_lock(&curr->bridge->mapped_lock);
467 list_del(&curr->mapped_list);
468 spin_unlock(&curr->bridge->mapped_lock);
471 EXPORT_SYMBOL(agp_unbind_memory);
474 /* End - Routines for handling swapping of agp_memory into the GATT */
477 /* Generic Agp routines - Start */
478 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
482 if (*requested_mode & AGP2_RESERVED_MASK) {
483 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
484 *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
485 *requested_mode &= ~AGP2_RESERVED_MASK;
489 * Some dumb bridges are programmed to disobey the AGP2 spec.
490 * This is likely a BIOS misprogramming rather than poweron default, or
491 * it would be a lot more common.
492 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
493 * AGPv2 spec 6.1.9 states:
494 * The RATE field indicates the data transfer rates supported by this
495 * device. A.G.P. devices must report all that apply.
496 * Fix them up as best we can.
498 switch (*bridge_agpstat & 7) {
500 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
501 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate. "
502 "Fixing up support for x2 & x1\n");
505 *bridge_agpstat |= AGPSTAT2_1X;
506 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate. "
507 "Fixing up support for x1\n");
513 /* Check the speed bits make sense. Only one should be set. */
514 tmp = *requested_mode & 7;
517 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
518 *requested_mode |= AGPSTAT2_1X;
524 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
531 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
535 /* disable SBA if it's not supported */
536 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
537 *bridge_agpstat &= ~AGPSTAT_SBA;
540 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
541 *bridge_agpstat &= ~AGPSTAT2_4X;
543 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
544 *bridge_agpstat &= ~AGPSTAT2_2X;
546 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
547 *bridge_agpstat &= ~AGPSTAT2_1X;
549 /* Now we know what mode it should be, clear out the unwanted bits. */
550 if (*bridge_agpstat & AGPSTAT2_4X)
551 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
553 if (*bridge_agpstat & AGPSTAT2_2X)
554 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
556 if (*bridge_agpstat & AGPSTAT2_1X)
557 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
559 /* Apply any errata. */
560 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
561 *bridge_agpstat &= ~AGPSTAT_FW;
563 if (agp_bridge->flags & AGP_ERRATA_SBA)
564 *bridge_agpstat &= ~AGPSTAT_SBA;
566 if (agp_bridge->flags & AGP_ERRATA_1X) {
567 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
568 *bridge_agpstat |= AGPSTAT2_1X;
571 /* If we've dropped down to 1X, disable fast writes. */
572 if (*bridge_agpstat & AGPSTAT2_1X)
573 *bridge_agpstat &= ~AGPSTAT_FW;
577 * requested_mode = Mode requested by (typically) X.
578 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
579 * vga_agpstat = PCI_AGP_STATUS from graphic card.
581 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
583 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
586 if (*requested_mode & AGP3_RESERVED_MASK) {
587 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
588 *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
589 *requested_mode &= ~AGP3_RESERVED_MASK;
592 /* Check the speed bits make sense. */
593 tmp = *requested_mode & 7;
595 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
596 *requested_mode |= AGPSTAT3_4X;
599 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
600 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
603 /* ARQSZ - Set the value to the maximum one.
604 * Don't allow the mode register to override values. */
605 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
606 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
608 /* Calibration cycle.
609 * Don't allow the mode register to override values. */
610 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
611 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
613 /* SBA *must* be supported for AGP v3 */
614 *bridge_agpstat |= AGPSTAT_SBA;
618 * Check for invalid speeds. This can happen when applications
619 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
621 if (*requested_mode & AGPSTAT_MODE_3_0) {
623 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
624 * have been passed a 3.0 mode, but with 2.x speed bits set.
625 * AGP2.x 4x -> AGP3.0 4x.
627 if (*requested_mode & AGPSTAT2_4X) {
628 printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
629 current->comm, *requested_mode);
630 *requested_mode &= ~AGPSTAT2_4X;
631 *requested_mode |= AGPSTAT3_4X;
635 * The caller doesn't know what they are doing. We are in 3.0 mode,
636 * but have been passed an AGP 2.x mode.
637 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
639 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
640 current->comm, *requested_mode);
641 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
642 *requested_mode |= AGPSTAT3_4X;
645 if (*requested_mode & AGPSTAT3_8X) {
646 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
647 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
648 *bridge_agpstat |= AGPSTAT3_4X;
649 printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
652 if (!(*vga_agpstat & AGPSTAT3_8X)) {
653 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
654 *bridge_agpstat |= AGPSTAT3_4X;
655 printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
658 /* All set, bridge & device can do AGP x8*/
659 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
662 } else if (*requested_mode & AGPSTAT3_4X) {
663 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
664 *bridge_agpstat |= AGPSTAT3_4X;
670 * If we didn't specify an AGP mode, we see if both
671 * the graphics card, and the bridge can do x8, and use if so.
672 * If not, we fall back to x4 mode.
674 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
675 printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
676 "supported by bridge & card (x8).\n");
677 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
678 *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
680 printk(KERN_INFO PFX "Fell back to AGPx4 mode because ");
681 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
682 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
683 *bridge_agpstat, origbridge);
684 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
685 *bridge_agpstat |= AGPSTAT3_4X;
687 if (!(*vga_agpstat & AGPSTAT3_8X)) {
688 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
689 *vga_agpstat, origvga);
690 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
691 *vga_agpstat |= AGPSTAT3_4X;
697 /* Apply any errata. */
698 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
699 *bridge_agpstat &= ~AGPSTAT_FW;
701 if (agp_bridge->flags & AGP_ERRATA_SBA)
702 *bridge_agpstat &= ~AGPSTAT_SBA;
704 if (agp_bridge->flags & AGP_ERRATA_1X) {
705 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
706 *bridge_agpstat |= AGPSTAT2_1X;
712 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
713 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
714 * @requested_mode: requested agp_stat from userspace (Typically from X)
715 * @bridge_agpstat: current agp_stat from AGP bridge.
717 * This function will hunt for an AGP graphics card, and try to match
718 * the requested mode to the capabilities of both the bridge and the card.
720 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
722 struct pci_dev *device = NULL;
727 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
729 printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
732 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
738 * Ok, here we have a AGP device. Disable impossible
739 * settings, and adjust the readqueue to the minimum.
741 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
743 /* adjust RQ depth */
744 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
745 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
746 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
748 /* disable FW if it's not supported */
749 if (!((bridge_agpstat & AGPSTAT_FW) &&
750 (vga_agpstat & AGPSTAT_FW) &&
751 (requested_mode & AGPSTAT_FW)))
752 bridge_agpstat &= ~AGPSTAT_FW;
754 /* Check to see if we are operating in 3.0 mode */
755 if (agp_bridge->mode & AGPSTAT_MODE_3_0)
756 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
758 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
761 return bridge_agpstat;
763 EXPORT_SYMBOL(agp_collect_device_status);
766 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
768 struct pci_dev *device = NULL;
771 mode = bridge_agpstat & 0x7;
775 for_each_pci_dev(device) {
776 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
780 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
781 agp_v3 ? 3 : 2, mode);
782 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
785 EXPORT_SYMBOL(agp_device_command);
788 void get_agp_version(struct agp_bridge_data *bridge)
792 /* Exit early if already set by errata workarounds. */
793 if (bridge->major_version != 0)
796 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
797 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
798 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
800 EXPORT_SYMBOL(get_agp_version);
803 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
805 u32 bridge_agpstat, temp;
807 get_agp_version(agp_bridge);
809 dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
810 agp_bridge->major_version, agp_bridge->minor_version);
812 pci_read_config_dword(agp_bridge->dev,
813 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
815 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
816 if (bridge_agpstat == 0)
817 /* Something bad happened. FIXME: Return error code? */
820 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
822 /* Do AGP version specific frobbing. */
823 if (bridge->major_version >= 3) {
824 if (bridge->mode & AGPSTAT_MODE_3_0) {
825 /* If we have 3.5, we can do the isoch stuff. */
826 if (bridge->minor_version >= 5)
827 agp_3_5_enable(bridge);
828 agp_device_command(bridge_agpstat, true);
831 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
832 bridge_agpstat &= ~(7<<10) ;
833 pci_read_config_dword(bridge->dev,
834 bridge->capndx+AGPCTRL, &temp);
836 pci_write_config_dword(bridge->dev,
837 bridge->capndx+AGPCTRL, temp);
839 dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
844 agp_device_command(bridge_agpstat, false);
846 EXPORT_SYMBOL(agp_generic_enable);
849 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
860 /* The generic routines can't handle 2 level gatt's */
861 if (bridge->driver->size_type == LVL2_APER_SIZE)
865 i = bridge->aperture_size_idx;
866 temp = bridge->current_size;
867 size = page_order = num_entries = 0;
869 if (bridge->driver->size_type != FIXED_APER_SIZE) {
871 switch (bridge->driver->size_type) {
873 size = A_SIZE_8(temp)->size;
875 A_SIZE_8(temp)->page_order;
877 A_SIZE_8(temp)->num_entries;
880 size = A_SIZE_16(temp)->size;
881 page_order = A_SIZE_16(temp)->page_order;
882 num_entries = A_SIZE_16(temp)->num_entries;
885 size = A_SIZE_32(temp)->size;
886 page_order = A_SIZE_32(temp)->page_order;
887 num_entries = A_SIZE_32(temp)->num_entries;
889 /* This case will never really happen. */
890 case FIXED_APER_SIZE:
893 size = page_order = num_entries = 0;
897 table = alloc_gatt_pages(page_order);
901 switch (bridge->driver->size_type) {
903 bridge->current_size = A_IDX8(bridge);
906 bridge->current_size = A_IDX16(bridge);
909 bridge->current_size = A_IDX32(bridge);
911 /* These cases will never really happen. */
912 case FIXED_APER_SIZE:
917 temp = bridge->current_size;
919 bridge->aperture_size_idx = i;
921 } while (!table && (i < bridge->driver->num_aperture_sizes));
923 size = ((struct aper_size_info_fixed *) temp)->size;
924 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
925 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
926 table = alloc_gatt_pages(page_order);
932 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
934 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
935 SetPageReserved(page);
937 bridge->gatt_table_real = (u32 *) table;
938 agp_gatt_table = (void *)table;
940 bridge->driver->cache_flush();
942 if (set_memory_uc((unsigned long)table, 1 << page_order))
943 printk(KERN_WARNING "Could not set GATT table memory to UC!\n");
945 bridge->gatt_table = (u32 __iomem *)table;
947 bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
948 (PAGE_SIZE * (1 << page_order)));
949 bridge->driver->cache_flush();
952 if (bridge->gatt_table == NULL) {
953 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
954 ClearPageReserved(page);
956 free_gatt_pages(table, page_order);
960 bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
962 /* AK: bogus, should encode addresses > 4GB */
963 for (i = 0; i < num_entries; i++) {
964 writel(bridge->scratch_page, bridge->gatt_table+i);
965 readl(bridge->gatt_table+i); /* PCI Posting. */
970 EXPORT_SYMBOL(agp_generic_create_gatt_table);
972 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
975 char *table, *table_end;
979 temp = bridge->current_size;
981 switch (bridge->driver->size_type) {
983 page_order = A_SIZE_8(temp)->page_order;
986 page_order = A_SIZE_16(temp)->page_order;
989 page_order = A_SIZE_32(temp)->page_order;
991 case FIXED_APER_SIZE:
992 page_order = A_SIZE_FIX(temp)->page_order;
995 /* The generic routines can't deal with 2 level gatt's */
1002 /* Do not worry about freeing memory, because if this is
1003 * called, then all agp memory is deallocated and removed
1004 * from the table. */
1007 set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1009 iounmap(bridge->gatt_table);
1011 table = (char *) bridge->gatt_table_real;
1012 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1014 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1015 ClearPageReserved(page);
1017 free_gatt_pages(bridge->gatt_table_real, page_order);
1019 agp_gatt_table = NULL;
1020 bridge->gatt_table = NULL;
1021 bridge->gatt_table_real = NULL;
1022 bridge->gatt_bus_addr = 0;
1026 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1029 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1035 struct agp_bridge_data *bridge;
1038 bridge = mem->bridge;
1042 if (mem->page_count == 0)
1045 temp = bridge->current_size;
1047 switch (bridge->driver->size_type) {
1049 num_entries = A_SIZE_8(temp)->num_entries;
1052 num_entries = A_SIZE_16(temp)->num_entries;
1055 num_entries = A_SIZE_32(temp)->num_entries;
1057 case FIXED_APER_SIZE:
1058 num_entries = A_SIZE_FIX(temp)->num_entries;
1060 case LVL2_APER_SIZE:
1061 /* The generic routines can't deal with 2 level gatt's */
1068 num_entries -= agp_memory_reserved/PAGE_SIZE;
1069 if (num_entries < 0) num_entries = 0;
1071 if (type != mem->type)
1074 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1075 if (mask_type != 0) {
1076 /* The generic routines know nothing of memory types */
1080 if (((pg_start + mem->page_count) > num_entries) ||
1081 ((pg_start + mem->page_count) < pg_start))
1086 while (j < (pg_start + mem->page_count)) {
1087 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1092 if (!mem->is_flushed) {
1093 bridge->driver->cache_flush();
1094 mem->is_flushed = true;
1097 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1098 writel(bridge->driver->mask_memory(bridge,
1099 page_to_phys(mem->pages[i]),
1101 bridge->gatt_table+j);
1103 readl(bridge->gatt_table+j-1); /* PCI Posting. */
1105 bridge->driver->tlb_flush(mem);
1108 EXPORT_SYMBOL(agp_generic_insert_memory);
1111 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1114 struct agp_bridge_data *bridge;
1115 int mask_type, num_entries;
1117 bridge = mem->bridge;
1121 if (mem->page_count == 0)
1124 if (type != mem->type)
1127 num_entries = agp_num_entries();
1128 if (((pg_start + mem->page_count) > num_entries) ||
1129 ((pg_start + mem->page_count) < pg_start))
1132 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1133 if (mask_type != 0) {
1134 /* The generic routines know nothing of memory types */
1138 /* AK: bogus, should encode addresses > 4GB */
1139 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1140 writel(bridge->scratch_page, bridge->gatt_table+i);
1142 readl(bridge->gatt_table+i-1); /* PCI Posting. */
1144 bridge->driver->tlb_flush(mem);
1147 EXPORT_SYMBOL(agp_generic_remove_memory);
1149 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1153 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1155 void agp_generic_free_by_type(struct agp_memory *curr)
1157 agp_free_page_array(curr);
1158 agp_free_key(curr->key);
1161 EXPORT_SYMBOL(agp_generic_free_by_type);
1163 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1165 struct agp_memory *new;
1169 pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1170 new = agp_create_user_memory(page_count);
1174 for (i = 0; i < page_count; i++)
1175 new->pages[i] = NULL;
1176 new->page_count = 0;
1178 new->num_scratch_pages = pages;
1182 EXPORT_SYMBOL(agp_generic_alloc_user);
1185 * Basic Page Allocation Routines -
1186 * These routines handle page allocation and by default they reserve the allocated
1187 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1188 * against a maximum value.
1191 int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1194 int i, ret = -ENOMEM;
1196 for (i = 0; i < num_pages; i++) {
1197 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1198 /* agp_free_memory() needs gart address */
1203 map_page_into_agp(page);
1206 atomic_inc(&agp_bridge->current_memory_agp);
1208 mem->pages[i] = page;
1213 set_pages_array_uc(mem->pages, num_pages);
1219 EXPORT_SYMBOL(agp_generic_alloc_pages);
1221 struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1225 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1229 map_page_into_agp(page);
1232 atomic_inc(&agp_bridge->current_memory_agp);
1235 EXPORT_SYMBOL(agp_generic_alloc_page);
1237 void agp_generic_destroy_pages(struct agp_memory *mem)
1246 set_pages_array_wb(mem->pages, mem->page_count);
1249 for (i = 0; i < mem->page_count; i++) {
1250 page = mem->pages[i];
1253 unmap_page_from_agp(page);
1257 atomic_dec(&agp_bridge->current_memory_agp);
1258 mem->pages[i] = NULL;
1261 EXPORT_SYMBOL(agp_generic_destroy_pages);
1263 void agp_generic_destroy_page(struct page *page, int flags)
1268 if (flags & AGP_PAGE_DESTROY_UNMAP)
1269 unmap_page_from_agp(page);
1271 if (flags & AGP_PAGE_DESTROY_FREE) {
1274 atomic_dec(&agp_bridge->current_memory_agp);
1277 EXPORT_SYMBOL(agp_generic_destroy_page);
1279 /* End Basic Page Allocation Routines */
1283 * agp_enable - initialise the agp point-to-point connection.
1285 * @mode: agp mode register value to configure with.
1287 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1291 bridge->driver->agp_enable(bridge, mode);
1293 EXPORT_SYMBOL(agp_enable);
1295 /* When we remove the global variable agp_bridge from all drivers
1296 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1299 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1301 if (list_empty(&agp_bridges))
1307 static void ipi_handler(void *null)
1312 void global_cache_flush(void)
1314 if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1315 panic(PFX "timed out waiting for the other CPUs!\n");
1317 EXPORT_SYMBOL(global_cache_flush);
1319 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1320 dma_addr_t addr, int type)
1322 /* memory type is ignored in the generic routine */
1323 if (bridge->driver->masks)
1324 return addr | bridge->driver->masks[0].mask;
1328 EXPORT_SYMBOL(agp_generic_mask_memory);
1330 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1333 if (type >= AGP_USER_TYPES)
1337 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1340 * These functions are implemented according to the AGPv3 spec,
1341 * which covers implementation details that had previously been
1345 int agp3_generic_fetch_size(void)
1349 struct aper_size_info_16 *values;
1351 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1352 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1354 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1355 if (temp_size == values[i].size_value) {
1356 agp_bridge->previous_size =
1357 agp_bridge->current_size = (void *) (values + i);
1359 agp_bridge->aperture_size_idx = i;
1360 return values[i].size;
1365 EXPORT_SYMBOL(agp3_generic_fetch_size);
1367 void agp3_generic_tlbflush(struct agp_memory *mem)
1370 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1371 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1372 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1374 EXPORT_SYMBOL(agp3_generic_tlbflush);
1376 int agp3_generic_configure(void)
1379 struct aper_size_info_16 *current_size;
1381 current_size = A_SIZE_16(agp_bridge->current_size);
1383 agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
1386 /* set aperture size */
1387 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1388 /* set gart pointer */
1389 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1390 /* enable aperture and GTLB */
1391 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1392 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1395 EXPORT_SYMBOL(agp3_generic_configure);
1397 void agp3_generic_cleanup(void)
1400 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1401 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1403 EXPORT_SYMBOL(agp3_generic_cleanup);
1405 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1407 {4096, 1048576, 10,0x000},
1408 {2048, 524288, 9, 0x800},
1409 {1024, 262144, 8, 0xc00},
1410 { 512, 131072, 7, 0xe00},
1411 { 256, 65536, 6, 0xf00},
1412 { 128, 32768, 5, 0xf20},
1413 { 64, 16384, 4, 0xf30},
1414 { 32, 8192, 3, 0xf38},
1415 { 16, 4096, 2, 0xf3c},
1416 { 8, 2048, 1, 0xf3e},
1417 { 4, 1024, 0, 0xf3f}
1419 EXPORT_SYMBOL(agp3_generic_sizes);