3 * Copyright (C) 2002-2004 Dave Jones.
4 * Copyright (C) 1999 Jeff Hartmann.
5 * Copyright (C) 1999 Precision Insight, Inc.
6 * Copyright (C) 1999 Xi Graphics, Inc.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
24 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 * - Allocate more than order 0 pages to avoid too much linear map splitting.
29 #include <linux/config.h>
30 #include <linux/module.h>
31 #include <linux/pci.h>
32 #include <linux/init.h>
33 #include <linux/pagemap.h>
34 #include <linux/miscdevice.h>
36 #include <linux/agp_backend.h>
37 #include <linux/vmalloc.h>
40 #include <asm/cacheflush.h>
41 #include <asm/pgtable.h>
44 __u32 *agp_gatt_table;
45 int agp_memory_reserved;
48 * Needed by the Nforce GART driver for the time being. Would be
49 * nice to do this some other way instead of needing this export.
51 EXPORT_SYMBOL_GPL(agp_memory_reserved);
53 #if defined(CONFIG_X86)
54 int map_page_into_agp(struct page *page)
57 i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
61 EXPORT_SYMBOL_GPL(map_page_into_agp);
63 int unmap_page_from_agp(struct page *page)
66 i = change_page_attr(page, 1, PAGE_KERNEL);
70 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
74 * Generic routines for handling agp_memory structures -
75 * They use the basic page allocation routines to do the brunt of the work.
78 void agp_free_key(int key)
84 clear_bit(key, agp_bridge->key_list);
86 EXPORT_SYMBOL(agp_free_key);
89 static int agp_get_key(void)
93 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
95 set_bit(bit, agp_bridge->key_list);
102 struct agp_memory *agp_create_memory(int scratch_pages)
104 struct agp_memory *new;
106 new = kmalloc(sizeof(struct agp_memory), GFP_KERNEL);
111 memset(new, 0, sizeof(struct agp_memory));
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)
142 if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
145 if (curr->is_bound == TRUE)
146 agp_unbind_memory(curr);
148 if (curr->type != 0) {
149 agp_bridge->driver->free_by_type(curr);
152 if (curr->page_count != 0) {
153 for (i = 0; i < curr->page_count; i++) {
154 agp_bridge->driver->agp_destroy_page(phys_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(size_t page_count, u32 type)
179 struct agp_memory *new;
182 if (agp_bridge->type == NOT_SUPPORTED)
185 if ((atomic_read(&agp_bridge->current_memory_agp) + page_count) > agp_bridge->max_memory_agp)
189 new = agp_bridge->driver->alloc_by_type(page_count, type);
193 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
195 new = agp_create_memory(scratch_pages);
200 for (i = 0; i < page_count; i++) {
201 void *addr = agp_bridge->driver->agp_alloc_page();
204 agp_free_memory(new);
207 new->memory[i] = virt_to_phys(addr);
211 flush_agp_mappings();
215 EXPORT_SYMBOL(agp_allocate_memory);
218 /* End - Generic routines for handling agp_memory structures */
221 static int agp_return_size(void)
226 temp = agp_bridge->current_size;
228 switch (agp_bridge->driver->size_type) {
230 current_size = A_SIZE_8(temp)->size;
233 current_size = A_SIZE_16(temp)->size;
236 current_size = A_SIZE_32(temp)->size;
239 current_size = A_SIZE_LVL2(temp)->size;
241 case FIXED_APER_SIZE:
242 current_size = A_SIZE_FIX(temp)->size;
249 current_size -= (agp_memory_reserved / (1024*1024));
256 int agp_num_entries(void)
261 temp = agp_bridge->current_size;
263 switch (agp_bridge->driver->size_type) {
265 num_entries = A_SIZE_8(temp)->num_entries;
268 num_entries = A_SIZE_16(temp)->num_entries;
271 num_entries = A_SIZE_32(temp)->num_entries;
274 num_entries = A_SIZE_LVL2(temp)->num_entries;
276 case FIXED_APER_SIZE:
277 num_entries = A_SIZE_FIX(temp)->num_entries;
284 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
289 EXPORT_SYMBOL_GPL(agp_num_entries);
293 * agp_copy_info - copy bridge state information
295 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
297 * This function copies information about the agp bridge device and the state of
298 * the agp backend into an agp_kern_info pointer.
300 int agp_copy_info(struct agp_kern_info *info)
302 memset(info, 0, sizeof(struct agp_kern_info));
303 if (!agp_bridge || agp_bridge->type == NOT_SUPPORTED ||
304 !agp_bridge->version) {
305 info->chipset = NOT_SUPPORTED;
309 info->version.major = agp_bridge->version->major;
310 info->version.minor = agp_bridge->version->minor;
311 info->chipset = agp_bridge->type;
312 info->device = agp_bridge->dev;
313 info->mode = agp_bridge->mode;
314 info->aper_base = agp_bridge->gart_bus_addr;
315 info->aper_size = agp_return_size();
316 info->max_memory = agp_bridge->max_memory_agp;
317 info->current_memory = atomic_read(&agp_bridge->current_memory_agp);
318 info->cant_use_aperture = agp_bridge->driver->cant_use_aperture;
319 info->vm_ops = agp_bridge->vm_ops;
320 info->page_mask = ~0UL;
323 EXPORT_SYMBOL(agp_copy_info);
326 /* End - Routine to copy over information structure */
330 * Routines for handling swapping of agp_memory into the GATT -
331 * These routines take agp_memory and insert them into the GATT.
332 * They call device specific routines to actually write to the GATT.
336 * agp_bind_memory - Bind an agp_memory structure into the GATT.
338 * @curr: agp_memory pointer
339 * @pg_start: an offset into the graphics aperture translation table
341 * It returns -EINVAL if the pointer == NULL.
342 * It returns -EBUSY if the area of the table requested is already in use.
344 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
348 if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
351 if (curr->is_bound == TRUE) {
352 printk (KERN_INFO PFX "memory %p is already bound!\n", curr);
355 if (curr->is_flushed == FALSE) {
356 agp_bridge->driver->cache_flush();
357 curr->is_flushed = TRUE;
359 ret_val = agp_bridge->driver->insert_memory(curr, pg_start, curr->type);
364 curr->is_bound = TRUE;
365 curr->pg_start = pg_start;
368 EXPORT_SYMBOL(agp_bind_memory);
372 * agp_unbind_memory - Removes an agp_memory structure from the GATT
374 * @curr: agp_memory pointer to be removed from the GATT.
376 * It returns -EINVAL if this piece of agp_memory is not currently bound to
377 * the graphics aperture translation table or if the agp_memory pointer == NULL
379 int agp_unbind_memory(struct agp_memory *curr)
383 if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
386 if (curr->is_bound != TRUE) {
387 printk (KERN_INFO PFX "memory %p was not bound!\n", curr);
391 ret_val = agp_bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
396 curr->is_bound = FALSE;
400 EXPORT_SYMBOL(agp_unbind_memory);
402 /* End - Routines for handling swapping of agp_memory into the GATT */
405 /* Generic Agp routines - Start */
406 static void agp_v2_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
408 /* disable SBA if it's not supported */
409 if (!((*cmd & AGPSTAT_SBA) && (*tmp & AGPSTAT_SBA) && (*mode & AGPSTAT_SBA)))
410 *cmd &= ~AGPSTAT_SBA;
413 if (!((*cmd & AGPSTAT2_4X) && (*tmp & AGPSTAT2_4X) && (*mode & AGPSTAT2_4X)))
414 *cmd &= ~AGPSTAT2_4X;
416 if (!((*cmd & AGPSTAT2_2X) && (*tmp & AGPSTAT2_2X) && (*mode & AGPSTAT2_2X)))
417 *cmd &= ~AGPSTAT2_2X;
419 if (!((*cmd & AGPSTAT2_1X) && (*tmp & AGPSTAT2_1X) && (*mode & AGPSTAT2_1X)))
420 *cmd &= ~AGPSTAT2_1X;
422 /* Now we know what mode it should be, clear out the unwanted bits. */
423 if (*cmd & AGPSTAT2_4X)
424 *cmd &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
426 if (*cmd & AGPSTAT2_2X)
427 *cmd &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
429 if (*cmd & AGPSTAT2_1X)
430 *cmd &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
434 * mode = requested mode.
435 * cmd = PCI_AGP_STATUS from agp bridge.
436 * tmp = PCI_AGP_STATUS from graphic card.
438 static void agp_v3_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
440 u32 origcmd=*cmd, origtmp=*tmp;
442 /* ARQSZ - Set the value to the maximum one.
443 * Don't allow the mode register to override values. */
444 *cmd = ((*cmd & ~AGPSTAT_ARQSZ) |
445 max_t(u32,(*cmd & AGPSTAT_ARQSZ),(*tmp & AGPSTAT_ARQSZ)));
447 /* Calibration cycle.
448 * Don't allow the mode register to override values. */
449 *cmd = ((*cmd & ~AGPSTAT_CAL_MASK) |
450 min_t(u32,(*cmd & AGPSTAT_CAL_MASK),(*tmp & AGPSTAT_CAL_MASK)));
452 /* SBA *must* be supported for AGP v3 */
457 * Check for invalid speeds. This can happen when applications
458 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
460 if (*mode & AGPSTAT_MODE_3_0) {
462 * Caller hasn't a clue what its doing. We are in 3.0 mode,
463 * have been passed a 3.0 mode, but with 2.x speed bits set.
464 * AGP2.x 4x -> AGP3.0 4x.
466 if (*mode & AGPSTAT2_4X) {
467 printk (KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
468 current->comm, *mode);
469 *mode &= ~AGPSTAT2_4X;
470 *mode |= AGPSTAT3_4X;
474 * The caller doesn't know what they are doing. We are in 3.0 mode,
475 * but have been passed an AGP 2.x mode.
476 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
478 printk (KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
479 current->comm, *mode);
480 *mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
481 *mode |= AGPSTAT3_4X;
484 if (*mode & AGPSTAT3_8X) {
485 if (!(*cmd & AGPSTAT3_8X)) {
486 *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
488 printk ("%s requested AGPx8 but bridge not capable.\n", current->comm);
491 if (!(*tmp & AGPSTAT3_8X)) {
492 *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
494 printk ("%s requested AGPx8 but graphic card not capable.\n", current->comm);
497 /* All set, bridge & device can do AGP x8*/
498 *cmd &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
504 * If we didn't specify AGPx8, we can only do x4.
505 * If the hardware can't do x4, we're up shit creek, and never
506 * should have got this far.
508 *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
509 if ((*cmd & AGPSTAT3_4X) && (*tmp & AGPSTAT3_4X))
512 printk (KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
513 "[cmd:%x tmp:%x fell back to:- cmd:%x tmp:%x]\n",
514 origcmd, origtmp, *cmd, *tmp);
515 if (!(*cmd & AGPSTAT3_4X))
516 printk (KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
517 if (!(*tmp & AGPSTAT3_4X))
518 printk (KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
523 //FIXME: This doesn't smell right.
524 //We need a function we pass an agp_device to.
525 u32 agp_collect_device_status(u32 mode, u32 cmd)
527 struct pci_dev *device = NULL;
532 for_each_pci_dev(device) {
533 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
537 //FIXME: We should probably skip anything here that
538 // isn't an AGP graphic card.
540 * Ok, here we have a AGP device. Disable impossible
541 * settings, and adjust the readqueue to the minimum.
543 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &tmp);
545 /* adjust RQ depth */
546 cmd = ((cmd & ~AGPSTAT_RQ_DEPTH) |
547 min_t(u32, (mode & AGPSTAT_RQ_DEPTH),
548 min_t(u32, (cmd & AGPSTAT_RQ_DEPTH), (tmp & AGPSTAT_RQ_DEPTH))));
550 /* disable FW if it's not supported */
551 if (!((cmd & AGPSTAT_FW) && (tmp & AGPSTAT_FW) && (mode & AGPSTAT_FW)))
554 /* Check to see if we are operating in 3.0 mode */
555 pci_read_config_dword(device, cap_ptr+AGPSTAT, &agp3);
556 if (agp3 & AGPSTAT_MODE_3_0) {
557 agp_v3_parse_one(&mode, &cmd, &tmp);
559 agp_v2_parse_one(&mode, &cmd, &tmp);
564 EXPORT_SYMBOL(agp_collect_device_status);
567 void agp_device_command(u32 command, int agp_v3)
569 struct pci_dev *device = NULL;
572 mode = command & 0x7;
576 for_each_pci_dev(device) {
577 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
581 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
582 agp_v3 ? 3 : 2, pci_name(device), mode);
583 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, command);
586 EXPORT_SYMBOL(agp_device_command);
589 void get_agp_version(struct agp_bridge_data *bridge)
593 /* Exit early if already set by errata workarounds. */
594 if (agp_bridge->major_version != 0)
597 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx, &ncapid);
598 agp_bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
599 agp_bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
601 EXPORT_SYMBOL(get_agp_version);
604 void agp_generic_enable(u32 mode)
609 get_agp_version(agp_bridge);
611 printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
612 agp_bridge->major_version,
613 agp_bridge->minor_version,
614 agp_bridge->dev->slot_name);
616 pci_read_config_dword(agp_bridge->dev,
617 agp_bridge->capndx + PCI_AGP_STATUS, &command);
619 command = agp_collect_device_status(mode, command);
620 command |= AGPSTAT_AGP_ENABLE;
622 /* Do AGP version specific frobbing. */
623 if(agp_bridge->major_version >= 3) {
624 pci_read_config_dword(agp_bridge->dev,
625 agp_bridge->capndx+AGPSTAT, &agp3);
627 /* Check to see if we are operating in 3.0 mode */
628 if (agp3 & AGPSTAT_MODE_3_0) {
629 /* If we have 3.5, we can do the isoch stuff. */
630 if (agp_bridge->minor_version >= 5)
631 agp_3_5_enable(agp_bridge);
632 agp_device_command(command, TRUE);
635 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
636 command &= ~(7<<10) ;
637 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
639 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp);
641 printk (KERN_INFO PFX "Device is in legacy mode,"
642 " falling back to 2.x\n");
647 agp_device_command(command, FALSE);
649 EXPORT_SYMBOL(agp_generic_enable);
652 int agp_generic_create_gatt_table(void)
663 /* The generic routines can't handle 2 level gatt's */
664 if (agp_bridge->driver->size_type == LVL2_APER_SIZE)
668 i = agp_bridge->aperture_size_idx;
669 temp = agp_bridge->current_size;
670 size = page_order = num_entries = 0;
672 if (agp_bridge->driver->size_type != FIXED_APER_SIZE) {
674 switch (agp_bridge->driver->size_type) {
676 size = A_SIZE_8(temp)->size;
678 A_SIZE_8(temp)->page_order;
680 A_SIZE_8(temp)->num_entries;
683 size = A_SIZE_16(temp)->size;
684 page_order = A_SIZE_16(temp)->page_order;
685 num_entries = A_SIZE_16(temp)->num_entries;
688 size = A_SIZE_32(temp)->size;
689 page_order = A_SIZE_32(temp)->page_order;
690 num_entries = A_SIZE_32(temp)->num_entries;
692 /* This case will never really happen. */
693 case FIXED_APER_SIZE:
696 size = page_order = num_entries = 0;
700 table = (char *) __get_free_pages(GFP_KERNEL,
705 switch (agp_bridge->driver->size_type) {
707 agp_bridge->current_size = A_IDX8(agp_bridge);
710 agp_bridge->current_size = A_IDX16(agp_bridge);
713 agp_bridge->current_size = A_IDX32(agp_bridge);
715 /* This case will never really happen. */
716 case FIXED_APER_SIZE:
719 agp_bridge->current_size =
720 agp_bridge->current_size;
723 temp = agp_bridge->current_size;
725 agp_bridge->aperture_size_idx = i;
727 } while (!table && (i < agp_bridge->driver->num_aperture_sizes));
729 size = ((struct aper_size_info_fixed *) temp)->size;
730 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
731 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
732 table = (char *) __get_free_pages(GFP_KERNEL, page_order);
738 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
740 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
741 SetPageReserved(page);
743 agp_bridge->gatt_table_real = (u32 *) table;
744 agp_gatt_table = (void *)table;
746 agp_bridge->driver->cache_flush();
747 agp_bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
748 (PAGE_SIZE * (1 << page_order)));
749 agp_bridge->driver->cache_flush();
751 if (agp_bridge->gatt_table == NULL) {
752 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
753 ClearPageReserved(page);
755 free_pages((unsigned long) table, page_order);
759 agp_bridge->gatt_bus_addr = virt_to_phys(agp_bridge->gatt_table_real);
761 /* AK: bogus, should encode addresses > 4GB */
762 for (i = 0; i < num_entries; i++) {
763 writel(agp_bridge->scratch_page, agp_bridge->gatt_table+i);
764 readl(agp_bridge->gatt_table+i); /* PCI Posting. */
769 EXPORT_SYMBOL(agp_generic_create_gatt_table);
771 int agp_generic_free_gatt_table(void)
774 char *table, *table_end;
778 temp = agp_bridge->current_size;
780 switch (agp_bridge->driver->size_type) {
782 page_order = A_SIZE_8(temp)->page_order;
785 page_order = A_SIZE_16(temp)->page_order;
788 page_order = A_SIZE_32(temp)->page_order;
790 case FIXED_APER_SIZE:
791 page_order = A_SIZE_FIX(temp)->page_order;
794 /* The generic routines can't deal with 2 level gatt's */
802 /* Do not worry about freeing memory, because if this is
803 * called, then all agp memory is deallocated and removed
806 iounmap(agp_bridge->gatt_table);
807 table = (char *) agp_bridge->gatt_table_real;
808 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
810 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
811 ClearPageReserved(page);
813 free_pages((unsigned long) agp_bridge->gatt_table_real, page_order);
815 agp_gatt_table = NULL;
816 agp_bridge->gatt_table = NULL;
817 agp_bridge->gatt_table_real = NULL;
818 agp_bridge->gatt_bus_addr = 0;
822 EXPORT_SYMBOL(agp_generic_free_gatt_table);
825 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
832 temp = agp_bridge->current_size;
834 switch (agp_bridge->driver->size_type) {
836 num_entries = A_SIZE_8(temp)->num_entries;
839 num_entries = A_SIZE_16(temp)->num_entries;
842 num_entries = A_SIZE_32(temp)->num_entries;
844 case FIXED_APER_SIZE:
845 num_entries = A_SIZE_FIX(temp)->num_entries;
848 /* The generic routines can't deal with 2 level gatt's */
856 num_entries -= agp_memory_reserved/PAGE_SIZE;
857 if (num_entries < 0) num_entries = 0;
859 if (type != 0 || mem->type != 0) {
860 /* The generic routines know nothing of memory types */
865 if ((pg_start + mem->page_count) > num_entries)
870 while (j < (pg_start + mem->page_count)) {
871 if (!PGE_EMPTY(agp_bridge, readl(agp_bridge->gatt_table+j)))
876 if (mem->is_flushed == FALSE) {
877 agp_bridge->driver->cache_flush();
878 mem->is_flushed = TRUE;
881 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
882 writel(agp_bridge->driver->mask_memory(mem->memory[i], mem->type), agp_bridge->gatt_table+j);
883 readl(agp_bridge->gatt_table+j); /* PCI Posting. */
886 agp_bridge->driver->tlb_flush(mem);
889 EXPORT_SYMBOL(agp_generic_insert_memory);
892 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
896 if (type != 0 || mem->type != 0) {
897 /* The generic routines know nothing of memory types */
901 /* AK: bogus, should encode addresses > 4GB */
902 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
903 writel(agp_bridge->scratch_page, agp_bridge->gatt_table+i);
904 readl(agp_bridge->gatt_table+i); /* PCI Posting. */
907 global_cache_flush();
908 agp_bridge->driver->tlb_flush(mem);
911 EXPORT_SYMBOL(agp_generic_remove_memory);
914 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
918 EXPORT_SYMBOL(agp_generic_alloc_by_type);
921 void agp_generic_free_by_type(struct agp_memory *curr)
923 if (curr->memory != NULL)
926 agp_free_key(curr->key);
929 EXPORT_SYMBOL(agp_generic_free_by_type);
933 * Basic Page Allocation Routines -
934 * These routines handle page allocation and by default they reserve the allocated
935 * memory. They also handle incrementing the current_memory_agp value, Which is checked
936 * against a maximum value.
939 void *agp_generic_alloc_page(void)
943 page = alloc_page(GFP_KERNEL);
947 map_page_into_agp(page);
951 atomic_inc(&agp_bridge->current_memory_agp);
952 return page_address(page);
954 EXPORT_SYMBOL(agp_generic_alloc_page);
957 void agp_generic_destroy_page(void *addr)
964 page = virt_to_page(addr);
965 unmap_page_from_agp(page);
969 free_page((unsigned long)addr);
970 atomic_dec(&agp_bridge->current_memory_agp);
972 EXPORT_SYMBOL(agp_generic_destroy_page);
974 /* End Basic Page Allocation Routines */
978 * agp_enable - initialise the agp point-to-point connection.
980 * @mode: agp mode register value to configure with.
982 void agp_enable(u32 mode)
984 if (agp_bridge->type == NOT_SUPPORTED)
986 agp_bridge->driver->agp_enable(mode);
988 EXPORT_SYMBOL(agp_enable);
991 static void ipi_handler(void *null)
996 void global_cache_flush(void)
998 if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
999 panic(PFX "timed out waiting for the other CPUs!\n");
1001 EXPORT_SYMBOL(global_cache_flush);
1003 unsigned long agp_generic_mask_memory(unsigned long addr, int type)
1005 /* memory type is ignored in the generic routine */
1006 if (agp_bridge->driver->masks)
1007 return addr | agp_bridge->driver->masks[0].mask;
1011 EXPORT_SYMBOL(agp_generic_mask_memory);
1014 * These functions are implemented according to the AGPv3 spec,
1015 * which covers implementation details that had previously been
1019 int agp3_generic_fetch_size(void)
1023 struct aper_size_info_16 *values;
1025 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1026 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1028 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1029 if (temp_size == values[i].size_value) {
1030 agp_bridge->previous_size =
1031 agp_bridge->current_size = (void *) (values + i);
1033 agp_bridge->aperture_size_idx = i;
1034 return values[i].size;
1039 EXPORT_SYMBOL(agp3_generic_fetch_size);
1041 void agp3_generic_tlbflush(struct agp_memory *mem)
1044 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1045 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1046 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1048 EXPORT_SYMBOL(agp3_generic_tlbflush);
1050 int agp3_generic_configure(void)
1053 struct aper_size_info_16 *current_size;
1055 current_size = A_SIZE_16(agp_bridge->current_size);
1057 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1058 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1060 /* set aperture size */
1061 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1062 /* set gart pointer */
1063 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1064 /* enable aperture and GTLB */
1065 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1066 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1069 EXPORT_SYMBOL(agp3_generic_configure);
1071 void agp3_generic_cleanup(void)
1074 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1075 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1077 EXPORT_SYMBOL(agp3_generic_cleanup);
1079 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1081 {4096, 1048576, 10,0x000},
1082 {2048, 524288, 9, 0x800},
1083 {1024, 262144, 8, 0xc00},
1084 { 512, 131072, 7, 0xe00},
1085 { 256, 65536, 6, 0xf00},
1086 { 128, 32768, 5, 0xf20},
1087 { 64, 16384, 4, 0xf30},
1088 { 32, 8192, 3, 0xf38},
1089 { 16, 4096, 2, 0xf3c},
1090 { 8, 2048, 1, 0xf3e},
1091 { 4, 1024, 0, 0xf3f}
1093 EXPORT_SYMBOL(agp3_generic_sizes);