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/config.h>
31 #include <linux/module.h>
32 #include <linux/pci.h>
33 #include <linux/init.h>
34 #include <linux/pagemap.h>
35 #include <linux/miscdevice.h>
37 #include <linux/agp_backend.h>
38 #include <linux/vmalloc.h>
39 #include <linux/dma-mapping.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);
55 #if defined(CONFIG_X86)
56 int map_page_into_agp(struct page *page)
59 i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
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);
72 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
76 * Generic routines for handling agp_memory structures -
77 * They use the basic page allocation routines to do the brunt of the work.
80 void agp_free_key(int key)
86 clear_bit(key, agp_bridge->key_list);
88 EXPORT_SYMBOL(agp_free_key);
91 static int agp_get_key(void)
95 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
97 set_bit(bit, agp_bridge->key_list);
104 struct agp_memory *agp_create_memory(int scratch_pages)
106 struct agp_memory *new;
108 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
112 new->key = agp_get_key();
118 new->memory = vmalloc(PAGE_SIZE * scratch_pages);
120 if (new->memory == NULL) {
121 agp_free_key(new->key);
125 new->num_scratch_pages = scratch_pages;
128 EXPORT_SYMBOL(agp_create_memory);
131 * agp_free_memory - free memory associated with an agp_memory pointer.
133 * @curr: agp_memory pointer to be freed.
135 * It is the only function that can be called when the backend is not owned
136 * by the caller. (So it can free memory on client death.)
138 void agp_free_memory(struct agp_memory *curr)
145 if (curr->is_bound == TRUE)
146 agp_unbind_memory(curr);
148 if (curr->type != 0) {
149 curr->bridge->driver->free_by_type(curr);
152 if (curr->page_count != 0) {
153 for (i = 0; i < curr->page_count; i++) {
154 curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
157 agp_free_key(curr->key);
161 EXPORT_SYMBOL(agp_free_memory);
163 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
166 * agp_allocate_memory - allocate a group of pages of a certain type.
168 * @page_count: size_t argument of the number of pages
169 * @type: u32 argument of the type of memory to be allocated.
171 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
172 * maps to physical ram. Any other type is device dependent.
174 * It returns NULL whenever memory is unavailable.
176 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
177 size_t page_count, u32 type)
180 struct agp_memory *new;
186 if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
190 new = bridge->driver->alloc_by_type(page_count, type);
192 new->bridge = bridge;
196 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
198 new = agp_create_memory(scratch_pages);
203 for (i = 0; i < page_count; i++) {
204 void *addr = bridge->driver->agp_alloc_page(bridge);
207 agp_free_memory(new);
210 new->memory[i] = virt_to_gart(addr);
213 new->bridge = bridge;
215 flush_agp_mappings();
219 EXPORT_SYMBOL(agp_allocate_memory);
222 /* End - Generic routines for handling agp_memory structures */
225 static int agp_return_size(void)
230 temp = agp_bridge->current_size;
232 switch (agp_bridge->driver->size_type) {
234 current_size = A_SIZE_8(temp)->size;
237 current_size = A_SIZE_16(temp)->size;
240 current_size = A_SIZE_32(temp)->size;
243 current_size = A_SIZE_LVL2(temp)->size;
245 case FIXED_APER_SIZE:
246 current_size = A_SIZE_FIX(temp)->size;
253 current_size -= (agp_memory_reserved / (1024*1024));
260 int agp_num_entries(void)
265 temp = agp_bridge->current_size;
267 switch (agp_bridge->driver->size_type) {
269 num_entries = A_SIZE_8(temp)->num_entries;
272 num_entries = A_SIZE_16(temp)->num_entries;
275 num_entries = A_SIZE_32(temp)->num_entries;
278 num_entries = A_SIZE_LVL2(temp)->num_entries;
280 case FIXED_APER_SIZE:
281 num_entries = A_SIZE_FIX(temp)->num_entries;
288 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
293 EXPORT_SYMBOL_GPL(agp_num_entries);
297 * agp_copy_info - copy bridge state information
299 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
301 * This function copies information about the agp bridge device and the state of
302 * the agp backend into an agp_kern_info pointer.
304 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
306 memset(info, 0, sizeof(struct agp_kern_info));
308 info->chipset = NOT_SUPPORTED;
312 info->version.major = bridge->version->major;
313 info->version.minor = bridge->version->minor;
314 info->chipset = SUPPORTED;
315 info->device = bridge->dev;
316 if (bridge->mode & AGPSTAT_MODE_3_0)
317 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
319 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
320 info->aper_base = bridge->gart_bus_addr;
321 info->aper_size = agp_return_size();
322 info->max_memory = bridge->max_memory_agp;
323 info->current_memory = atomic_read(&bridge->current_memory_agp);
324 info->cant_use_aperture = bridge->driver->cant_use_aperture;
325 info->vm_ops = bridge->vm_ops;
326 info->page_mask = ~0UL;
329 EXPORT_SYMBOL(agp_copy_info);
331 /* End - Routine to copy over information structure */
334 * Routines for handling swapping of agp_memory into the GATT -
335 * These routines take agp_memory and insert them into the GATT.
336 * They call device specific routines to actually write to the GATT.
340 * agp_bind_memory - Bind an agp_memory structure into the GATT.
342 * @curr: agp_memory pointer
343 * @pg_start: an offset into the graphics aperture translation table
345 * It returns -EINVAL if the pointer == NULL.
346 * It returns -EBUSY if the area of the table requested is already in use.
348 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
355 if (curr->is_bound == TRUE) {
356 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
359 if (curr->is_flushed == FALSE) {
360 curr->bridge->driver->cache_flush();
361 curr->is_flushed = TRUE;
363 ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
368 curr->is_bound = TRUE;
369 curr->pg_start = pg_start;
372 EXPORT_SYMBOL(agp_bind_memory);
376 * agp_unbind_memory - Removes an agp_memory structure from the GATT
378 * @curr: agp_memory pointer to be removed from the GATT.
380 * It returns -EINVAL if this piece of agp_memory is not currently bound to
381 * the graphics aperture translation table or if the agp_memory pointer == NULL
383 int agp_unbind_memory(struct agp_memory *curr)
390 if (curr->is_bound != TRUE) {
391 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
395 ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
400 curr->is_bound = FALSE;
404 EXPORT_SYMBOL(agp_unbind_memory);
406 /* End - Routines for handling swapping of agp_memory into the GATT */
409 /* Generic Agp routines - Start */
410 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
414 if (*requested_mode & AGP2_RESERVED_MASK) {
415 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
416 *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
417 *requested_mode &= ~AGP2_RESERVED_MASK;
420 /* Check the speed bits make sense. Only one should be set. */
421 tmp = *requested_mode & 7;
424 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
425 *requested_mode |= AGPSTAT2_1X;
431 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
438 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
442 /* disable SBA if it's not supported */
443 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
444 *bridge_agpstat &= ~AGPSTAT_SBA;
447 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
448 *bridge_agpstat &= ~AGPSTAT2_4X;
450 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
451 *bridge_agpstat &= ~AGPSTAT2_2X;
453 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
454 *bridge_agpstat &= ~AGPSTAT2_1X;
456 /* Now we know what mode it should be, clear out the unwanted bits. */
457 if (*bridge_agpstat & AGPSTAT2_4X)
458 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
460 if (*bridge_agpstat & AGPSTAT2_2X)
461 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
463 if (*bridge_agpstat & AGPSTAT2_1X)
464 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
466 /* Apply any errata. */
467 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
468 *bridge_agpstat &= ~AGPSTAT_FW;
470 if (agp_bridge->flags & AGP_ERRATA_SBA)
471 *bridge_agpstat &= ~AGPSTAT_SBA;
473 if (agp_bridge->flags & AGP_ERRATA_1X) {
474 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
475 *bridge_agpstat |= AGPSTAT2_1X;
478 /* If we've dropped down to 1X, disable fast writes. */
479 if (*bridge_agpstat & AGPSTAT2_1X)
480 *bridge_agpstat &= ~AGPSTAT_FW;
484 * requested_mode = Mode requested by (typically) X.
485 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
486 * vga_agpstat = PCI_AGP_STATUS from graphic card.
488 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
490 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
493 if (*requested_mode & AGP3_RESERVED_MASK) {
494 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
495 *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
496 *requested_mode &= ~AGP3_RESERVED_MASK;
499 /* Check the speed bits make sense. */
500 tmp = *requested_mode & 7;
502 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
503 *requested_mode |= AGPSTAT3_4X;
506 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
507 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
510 /* ARQSZ - Set the value to the maximum one.
511 * Don't allow the mode register to override values. */
512 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
513 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
515 /* Calibration cycle.
516 * Don't allow the mode register to override values. */
517 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
518 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
520 /* SBA *must* be supported for AGP v3 */
521 *bridge_agpstat |= AGPSTAT_SBA;
525 * Check for invalid speeds. This can happen when applications
526 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
528 if (*requested_mode & AGPSTAT_MODE_3_0) {
530 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
531 * have been passed a 3.0 mode, but with 2.x speed bits set.
532 * AGP2.x 4x -> AGP3.0 4x.
534 if (*requested_mode & AGPSTAT2_4X) {
535 printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
536 current->comm, *requested_mode);
537 *requested_mode &= ~AGPSTAT2_4X;
538 *requested_mode |= AGPSTAT3_4X;
542 * The caller doesn't know what they are doing. We are in 3.0 mode,
543 * but have been passed an AGP 2.x mode.
544 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
546 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
547 current->comm, *requested_mode);
548 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
549 *requested_mode |= AGPSTAT3_4X;
552 if (*requested_mode & AGPSTAT3_8X) {
553 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
554 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
555 *bridge_agpstat |= AGPSTAT3_4X;
556 printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
559 if (!(*vga_agpstat & AGPSTAT3_8X)) {
560 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
561 *bridge_agpstat |= AGPSTAT3_4X;
562 printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
565 /* All set, bridge & device can do AGP x8*/
566 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
572 * If we didn't specify AGPx8, we can only do x4.
573 * If the hardware can't do x4, we're up shit creek, and never
574 * should have got this far.
576 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
577 if ((*bridge_agpstat & AGPSTAT3_4X) && (*vga_agpstat & AGPSTAT3_4X))
578 *bridge_agpstat |= AGPSTAT3_4X;
580 printk(KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
581 "[bridge_agpstat:%x vga_agpstat:%x fell back to:- bridge_agpstat:%x vga_agpstat:%x]\n",
582 origbridge, origvga, *bridge_agpstat, *vga_agpstat);
583 if (!(*bridge_agpstat & AGPSTAT3_4X))
584 printk(KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
585 if (!(*vga_agpstat & AGPSTAT3_4X))
586 printk(KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
592 /* Apply any errata. */
593 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
594 *bridge_agpstat &= ~AGPSTAT_FW;
596 if (agp_bridge->flags & AGP_ERRATA_SBA)
597 *bridge_agpstat &= ~AGPSTAT_SBA;
599 if (agp_bridge->flags & AGP_ERRATA_1X) {
600 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
601 *bridge_agpstat |= AGPSTAT2_1X;
607 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
608 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
609 * @requested_mode: requested agp_stat from userspace (Typically from X)
610 * @bridge_agpstat: current agp_stat from AGP bridge.
612 * This function will hunt for an AGP graphics card, and try to match
613 * the requested mode to the capabilities of both the bridge and the card.
615 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
617 struct pci_dev *device = NULL;
622 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
624 printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
627 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
633 * Ok, here we have a AGP device. Disable impossible
634 * settings, and adjust the readqueue to the minimum.
636 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
638 /* adjust RQ depth */
639 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
640 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
641 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
643 /* disable FW if it's not supported */
644 if (!((bridge_agpstat & AGPSTAT_FW) &&
645 (vga_agpstat & AGPSTAT_FW) &&
646 (requested_mode & AGPSTAT_FW)))
647 bridge_agpstat &= ~AGPSTAT_FW;
649 /* Check to see if we are operating in 3.0 mode */
650 if (agp_bridge->mode & AGPSTAT_MODE_3_0)
651 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
653 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
656 return bridge_agpstat;
658 EXPORT_SYMBOL(agp_collect_device_status);
661 void agp_device_command(u32 bridge_agpstat, int agp_v3)
663 struct pci_dev *device = NULL;
666 mode = bridge_agpstat & 0x7;
670 for_each_pci_dev(device) {
671 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
675 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
676 agp_v3 ? 3 : 2, pci_name(device), mode);
677 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
680 EXPORT_SYMBOL(agp_device_command);
683 void get_agp_version(struct agp_bridge_data *bridge)
687 /* Exit early if already set by errata workarounds. */
688 if (bridge->major_version != 0)
691 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
692 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
693 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
695 EXPORT_SYMBOL(get_agp_version);
698 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
700 u32 bridge_agpstat, temp;
702 get_agp_version(agp_bridge);
704 printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
705 agp_bridge->major_version,
706 agp_bridge->minor_version,
707 pci_name(agp_bridge->dev));
709 pci_read_config_dword(agp_bridge->dev,
710 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
712 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
713 if (bridge_agpstat == 0)
714 /* Something bad happened. FIXME: Return error code? */
717 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
719 /* Do AGP version specific frobbing. */
720 if (bridge->major_version >= 3) {
721 if (bridge->mode & AGPSTAT_MODE_3_0) {
722 /* If we have 3.5, we can do the isoch stuff. */
723 if (bridge->minor_version >= 5)
724 agp_3_5_enable(bridge);
725 agp_device_command(bridge_agpstat, TRUE);
728 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
729 bridge_agpstat &= ~(7<<10) ;
730 pci_read_config_dword(bridge->dev,
731 bridge->capndx+AGPCTRL, &temp);
733 pci_write_config_dword(bridge->dev,
734 bridge->capndx+AGPCTRL, temp);
736 printk(KERN_INFO PFX "Device is in legacy mode,"
737 " falling back to 2.x\n");
742 agp_device_command(bridge_agpstat, FALSE);
744 EXPORT_SYMBOL(agp_generic_enable);
747 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
758 /* The generic routines can't handle 2 level gatt's */
759 if (bridge->driver->size_type == LVL2_APER_SIZE)
763 i = bridge->aperture_size_idx;
764 temp = bridge->current_size;
765 size = page_order = num_entries = 0;
767 if (bridge->driver->size_type != FIXED_APER_SIZE) {
769 switch (bridge->driver->size_type) {
771 size = A_SIZE_8(temp)->size;
773 A_SIZE_8(temp)->page_order;
775 A_SIZE_8(temp)->num_entries;
778 size = A_SIZE_16(temp)->size;
779 page_order = A_SIZE_16(temp)->page_order;
780 num_entries = A_SIZE_16(temp)->num_entries;
783 size = A_SIZE_32(temp)->size;
784 page_order = A_SIZE_32(temp)->page_order;
785 num_entries = A_SIZE_32(temp)->num_entries;
787 /* This case will never really happen. */
788 case FIXED_APER_SIZE:
791 size = page_order = num_entries = 0;
795 table = alloc_gatt_pages(page_order);
799 switch (bridge->driver->size_type) {
801 bridge->current_size = A_IDX8(bridge);
804 bridge->current_size = A_IDX16(bridge);
807 bridge->current_size = A_IDX32(bridge);
809 /* This case will never really happen. */
810 case FIXED_APER_SIZE:
813 bridge->current_size =
814 bridge->current_size;
817 temp = bridge->current_size;
819 bridge->aperture_size_idx = i;
821 } while (!table && (i < bridge->driver->num_aperture_sizes));
823 size = ((struct aper_size_info_fixed *) temp)->size;
824 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
825 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
826 table = alloc_gatt_pages(page_order);
832 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
834 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
835 SetPageReserved(page);
837 bridge->gatt_table_real = (u32 *) table;
838 agp_gatt_table = (void *)table;
840 bridge->driver->cache_flush();
841 bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
842 (PAGE_SIZE * (1 << page_order)));
843 bridge->driver->cache_flush();
845 if (bridge->gatt_table == NULL) {
846 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
847 ClearPageReserved(page);
849 free_gatt_pages(table, page_order);
853 bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
855 /* AK: bogus, should encode addresses > 4GB */
856 for (i = 0; i < num_entries; i++) {
857 writel(bridge->scratch_page, bridge->gatt_table+i);
858 readl(bridge->gatt_table+i); /* PCI Posting. */
863 EXPORT_SYMBOL(agp_generic_create_gatt_table);
865 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
868 char *table, *table_end;
872 temp = bridge->current_size;
874 switch (bridge->driver->size_type) {
876 page_order = A_SIZE_8(temp)->page_order;
879 page_order = A_SIZE_16(temp)->page_order;
882 page_order = A_SIZE_32(temp)->page_order;
884 case FIXED_APER_SIZE:
885 page_order = A_SIZE_FIX(temp)->page_order;
888 /* The generic routines can't deal with 2 level gatt's */
896 /* Do not worry about freeing memory, because if this is
897 * called, then all agp memory is deallocated and removed
900 iounmap(bridge->gatt_table);
901 table = (char *) bridge->gatt_table_real;
902 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
904 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
905 ClearPageReserved(page);
907 free_gatt_pages(bridge->gatt_table_real, page_order);
909 agp_gatt_table = NULL;
910 bridge->gatt_table = NULL;
911 bridge->gatt_table_real = NULL;
912 bridge->gatt_bus_addr = 0;
916 EXPORT_SYMBOL(agp_generic_free_gatt_table);
919 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
925 struct agp_bridge_data *bridge;
927 bridge = mem->bridge;
931 temp = bridge->current_size;
933 switch (bridge->driver->size_type) {
935 num_entries = A_SIZE_8(temp)->num_entries;
938 num_entries = A_SIZE_16(temp)->num_entries;
941 num_entries = A_SIZE_32(temp)->num_entries;
943 case FIXED_APER_SIZE:
944 num_entries = A_SIZE_FIX(temp)->num_entries;
947 /* The generic routines can't deal with 2 level gatt's */
955 num_entries -= agp_memory_reserved/PAGE_SIZE;
956 if (num_entries < 0) num_entries = 0;
958 if (type != 0 || mem->type != 0) {
959 /* The generic routines know nothing of memory types */
964 if ((pg_start + mem->page_count) > num_entries)
969 while (j < (pg_start + mem->page_count)) {
970 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
975 if (mem->is_flushed == FALSE) {
976 bridge->driver->cache_flush();
977 mem->is_flushed = TRUE;
980 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
981 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mem->type), bridge->gatt_table+j);
982 readl(bridge->gatt_table+j); /* PCI Posting. */
985 bridge->driver->tlb_flush(mem);
988 EXPORT_SYMBOL(agp_generic_insert_memory);
991 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
994 struct agp_bridge_data *bridge;
996 bridge = mem->bridge;
1000 if (type != 0 || mem->type != 0) {
1001 /* The generic routines know nothing of memory types */
1005 /* AK: bogus, should encode addresses > 4GB */
1006 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1007 writel(bridge->scratch_page, bridge->gatt_table+i);
1008 readl(bridge->gatt_table+i); /* PCI Posting. */
1011 global_cache_flush();
1012 bridge->driver->tlb_flush(mem);
1015 EXPORT_SYMBOL(agp_generic_remove_memory);
1018 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1022 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1025 void agp_generic_free_by_type(struct agp_memory *curr)
1027 vfree(curr->memory);
1028 agp_free_key(curr->key);
1031 EXPORT_SYMBOL(agp_generic_free_by_type);
1035 * Basic Page Allocation Routines -
1036 * These routines handle page allocation and by default they reserve the allocated
1037 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1038 * against a maximum value.
1041 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1045 page = alloc_page(GFP_KERNEL);
1049 map_page_into_agp(page);
1052 SetPageLocked(page);
1053 atomic_inc(&agp_bridge->current_memory_agp);
1054 return page_address(page);
1056 EXPORT_SYMBOL(agp_generic_alloc_page);
1059 void agp_generic_destroy_page(void *addr)
1066 page = virt_to_page(addr);
1067 unmap_page_from_agp(page);
1070 free_page((unsigned long)addr);
1071 atomic_dec(&agp_bridge->current_memory_agp);
1073 EXPORT_SYMBOL(agp_generic_destroy_page);
1075 /* End Basic Page Allocation Routines */
1079 * agp_enable - initialise the agp point-to-point connection.
1081 * @mode: agp mode register value to configure with.
1083 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1087 bridge->driver->agp_enable(bridge, mode);
1089 EXPORT_SYMBOL(agp_enable);
1091 /* When we remove the global variable agp_bridge from all drivers
1092 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1095 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1097 if (list_empty(&agp_bridges))
1103 static void ipi_handler(void *null)
1108 void global_cache_flush(void)
1110 if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1111 panic(PFX "timed out waiting for the other CPUs!\n");
1113 EXPORT_SYMBOL(global_cache_flush);
1115 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1116 unsigned long addr, int type)
1118 /* memory type is ignored in the generic routine */
1119 if (bridge->driver->masks)
1120 return addr | bridge->driver->masks[0].mask;
1124 EXPORT_SYMBOL(agp_generic_mask_memory);
1127 * These functions are implemented according to the AGPv3 spec,
1128 * which covers implementation details that had previously been
1132 int agp3_generic_fetch_size(void)
1136 struct aper_size_info_16 *values;
1138 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1139 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1141 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1142 if (temp_size == values[i].size_value) {
1143 agp_bridge->previous_size =
1144 agp_bridge->current_size = (void *) (values + i);
1146 agp_bridge->aperture_size_idx = i;
1147 return values[i].size;
1152 EXPORT_SYMBOL(agp3_generic_fetch_size);
1154 void agp3_generic_tlbflush(struct agp_memory *mem)
1157 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1158 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1159 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1161 EXPORT_SYMBOL(agp3_generic_tlbflush);
1163 int agp3_generic_configure(void)
1166 struct aper_size_info_16 *current_size;
1168 current_size = A_SIZE_16(agp_bridge->current_size);
1170 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1171 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1173 /* set aperture size */
1174 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1175 /* set gart pointer */
1176 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1177 /* enable aperture and GTLB */
1178 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1179 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1182 EXPORT_SYMBOL(agp3_generic_configure);
1184 void agp3_generic_cleanup(void)
1187 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1188 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1190 EXPORT_SYMBOL(agp3_generic_cleanup);
1192 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1194 {4096, 1048576, 10,0x000},
1195 {2048, 524288, 9, 0x800},
1196 {1024, 262144, 8, 0xc00},
1197 { 512, 131072, 7, 0xe00},
1198 { 256, 65536, 6, 0xf00},
1199 { 128, 32768, 5, 0xf20},
1200 { 64, 16384, 4, 0xf30},
1201 { 32, 8192, 3, 0xf38},
1202 { 16, 4096, 2, 0xf3c},
1203 { 8, 2048, 1, 0xf3e},
1204 { 4, 1024, 0, 0xf3f}
1206 EXPORT_SYMBOL(agp3_generic_sizes);