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);
60 /* Caller's responsibility to call global_flush_tlb() for
61 * performance reasons */
64 EXPORT_SYMBOL_GPL(map_page_into_agp);
66 int unmap_page_from_agp(struct page *page)
69 i = change_page_attr(page, 1, PAGE_KERNEL);
70 /* Caller's responsibility to call global_flush_tlb() for
71 * performance reasons */
74 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
78 * Generic routines for handling agp_memory structures -
79 * They use the basic page allocation routines to do the brunt of the work.
82 void agp_free_key(int key)
88 clear_bit(key, agp_bridge->key_list);
90 EXPORT_SYMBOL(agp_free_key);
93 static int agp_get_key(void)
97 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
99 set_bit(bit, agp_bridge->key_list);
106 struct agp_memory *agp_create_memory(int scratch_pages)
108 struct agp_memory *new;
110 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
114 new->key = agp_get_key();
120 new->memory = vmalloc(PAGE_SIZE * scratch_pages);
122 if (new->memory == NULL) {
123 agp_free_key(new->key);
127 new->num_scratch_pages = scratch_pages;
130 EXPORT_SYMBOL(agp_create_memory);
133 * agp_free_memory - free memory associated with an agp_memory pointer.
135 * @curr: agp_memory pointer to be freed.
137 * It is the only function that can be called when the backend is not owned
138 * by the caller. (So it can free memory on client death.)
140 void agp_free_memory(struct agp_memory *curr)
147 if (curr->is_bound == TRUE)
148 agp_unbind_memory(curr);
150 if (curr->type != 0) {
151 curr->bridge->driver->free_by_type(curr);
154 if (curr->page_count != 0) {
155 for (i = 0; i < curr->page_count; i++) {
156 curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
160 agp_free_key(curr->key);
164 EXPORT_SYMBOL(agp_free_memory);
166 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
169 * agp_allocate_memory - allocate a group of pages of a certain type.
171 * @page_count: size_t argument of the number of pages
172 * @type: u32 argument of the type of memory to be allocated.
174 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
175 * maps to physical ram. Any other type is device dependent.
177 * It returns NULL whenever memory is unavailable.
179 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
180 size_t page_count, u32 type)
183 struct agp_memory *new;
189 if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
193 new = bridge->driver->alloc_by_type(page_count, type);
195 new->bridge = bridge;
199 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
201 new = agp_create_memory(scratch_pages);
206 for (i = 0; i < page_count; i++) {
207 void *addr = bridge->driver->agp_alloc_page(bridge);
210 agp_free_memory(new);
213 new->memory[i] = virt_to_gart(addr);
218 new->bridge = bridge;
220 flush_agp_mappings();
224 EXPORT_SYMBOL(agp_allocate_memory);
227 /* End - Generic routines for handling agp_memory structures */
230 static int agp_return_size(void)
235 temp = agp_bridge->current_size;
237 switch (agp_bridge->driver->size_type) {
239 current_size = A_SIZE_8(temp)->size;
242 current_size = A_SIZE_16(temp)->size;
245 current_size = A_SIZE_32(temp)->size;
248 current_size = A_SIZE_LVL2(temp)->size;
250 case FIXED_APER_SIZE:
251 current_size = A_SIZE_FIX(temp)->size;
258 current_size -= (agp_memory_reserved / (1024*1024));
265 int agp_num_entries(void)
270 temp = agp_bridge->current_size;
272 switch (agp_bridge->driver->size_type) {
274 num_entries = A_SIZE_8(temp)->num_entries;
277 num_entries = A_SIZE_16(temp)->num_entries;
280 num_entries = A_SIZE_32(temp)->num_entries;
283 num_entries = A_SIZE_LVL2(temp)->num_entries;
285 case FIXED_APER_SIZE:
286 num_entries = A_SIZE_FIX(temp)->num_entries;
293 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
298 EXPORT_SYMBOL_GPL(agp_num_entries);
302 * agp_copy_info - copy bridge state information
304 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
306 * This function copies information about the agp bridge device and the state of
307 * the agp backend into an agp_kern_info pointer.
309 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
311 memset(info, 0, sizeof(struct agp_kern_info));
313 info->chipset = NOT_SUPPORTED;
317 info->version.major = bridge->version->major;
318 info->version.minor = bridge->version->minor;
319 info->chipset = SUPPORTED;
320 info->device = bridge->dev;
321 if (bridge->mode & AGPSTAT_MODE_3_0)
322 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
324 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
325 info->aper_base = bridge->gart_bus_addr;
326 info->aper_size = agp_return_size();
327 info->max_memory = bridge->max_memory_agp;
328 info->current_memory = atomic_read(&bridge->current_memory_agp);
329 info->cant_use_aperture = bridge->driver->cant_use_aperture;
330 info->vm_ops = bridge->vm_ops;
331 info->page_mask = ~0UL;
334 EXPORT_SYMBOL(agp_copy_info);
336 /* End - Routine to copy over information structure */
339 * Routines for handling swapping of agp_memory into the GATT -
340 * These routines take agp_memory and insert them into the GATT.
341 * They call device specific routines to actually write to the GATT.
345 * agp_bind_memory - Bind an agp_memory structure into the GATT.
347 * @curr: agp_memory pointer
348 * @pg_start: an offset into the graphics aperture translation table
350 * It returns -EINVAL if the pointer == NULL.
351 * It returns -EBUSY if the area of the table requested is already in use.
353 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
360 if (curr->is_bound == TRUE) {
361 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
364 if (curr->is_flushed == FALSE) {
365 curr->bridge->driver->cache_flush();
366 curr->is_flushed = TRUE;
368 ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
373 curr->is_bound = TRUE;
374 curr->pg_start = pg_start;
377 EXPORT_SYMBOL(agp_bind_memory);
381 * agp_unbind_memory - Removes an agp_memory structure from the GATT
383 * @curr: agp_memory pointer to be removed from the GATT.
385 * It returns -EINVAL if this piece of agp_memory is not currently bound to
386 * the graphics aperture translation table or if the agp_memory pointer == NULL
388 int agp_unbind_memory(struct agp_memory *curr)
395 if (curr->is_bound != TRUE) {
396 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
400 ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
405 curr->is_bound = FALSE;
409 EXPORT_SYMBOL(agp_unbind_memory);
411 /* End - Routines for handling swapping of agp_memory into the GATT */
414 /* Generic Agp routines - Start */
415 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
419 if (*requested_mode & AGP2_RESERVED_MASK) {
420 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
421 *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
422 *requested_mode &= ~AGP2_RESERVED_MASK;
425 /* Check the speed bits make sense. Only one should be set. */
426 tmp = *requested_mode & 7;
429 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
430 *requested_mode |= AGPSTAT2_1X;
436 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
443 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
447 /* disable SBA if it's not supported */
448 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
449 *bridge_agpstat &= ~AGPSTAT_SBA;
452 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
453 *bridge_agpstat &= ~AGPSTAT2_4X;
455 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
456 *bridge_agpstat &= ~AGPSTAT2_2X;
458 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
459 *bridge_agpstat &= ~AGPSTAT2_1X;
461 /* Now we know what mode it should be, clear out the unwanted bits. */
462 if (*bridge_agpstat & AGPSTAT2_4X)
463 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
465 if (*bridge_agpstat & AGPSTAT2_2X)
466 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
468 if (*bridge_agpstat & AGPSTAT2_1X)
469 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
471 /* Apply any errata. */
472 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
473 *bridge_agpstat &= ~AGPSTAT_FW;
475 if (agp_bridge->flags & AGP_ERRATA_SBA)
476 *bridge_agpstat &= ~AGPSTAT_SBA;
478 if (agp_bridge->flags & AGP_ERRATA_1X) {
479 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
480 *bridge_agpstat |= AGPSTAT2_1X;
483 /* If we've dropped down to 1X, disable fast writes. */
484 if (*bridge_agpstat & AGPSTAT2_1X)
485 *bridge_agpstat &= ~AGPSTAT_FW;
489 * requested_mode = Mode requested by (typically) X.
490 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
491 * vga_agpstat = PCI_AGP_STATUS from graphic card.
493 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
495 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
498 if (*requested_mode & AGP3_RESERVED_MASK) {
499 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
500 *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
501 *requested_mode &= ~AGP3_RESERVED_MASK;
504 /* Check the speed bits make sense. */
505 tmp = *requested_mode & 7;
507 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
508 *requested_mode |= AGPSTAT3_4X;
511 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
512 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
515 /* ARQSZ - Set the value to the maximum one.
516 * Don't allow the mode register to override values. */
517 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
518 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
520 /* Calibration cycle.
521 * Don't allow the mode register to override values. */
522 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
523 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
525 /* SBA *must* be supported for AGP v3 */
526 *bridge_agpstat |= AGPSTAT_SBA;
530 * Check for invalid speeds. This can happen when applications
531 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
533 if (*requested_mode & AGPSTAT_MODE_3_0) {
535 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
536 * have been passed a 3.0 mode, but with 2.x speed bits set.
537 * AGP2.x 4x -> AGP3.0 4x.
539 if (*requested_mode & AGPSTAT2_4X) {
540 printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
541 current->comm, *requested_mode);
542 *requested_mode &= ~AGPSTAT2_4X;
543 *requested_mode |= AGPSTAT3_4X;
547 * The caller doesn't know what they are doing. We are in 3.0 mode,
548 * but have been passed an AGP 2.x mode.
549 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
551 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
552 current->comm, *requested_mode);
553 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
554 *requested_mode |= AGPSTAT3_4X;
557 if (*requested_mode & AGPSTAT3_8X) {
558 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
559 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
560 *bridge_agpstat |= AGPSTAT3_4X;
561 printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
564 if (!(*vga_agpstat & AGPSTAT3_8X)) {
565 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
566 *bridge_agpstat |= AGPSTAT3_4X;
567 printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
570 /* All set, bridge & device can do AGP x8*/
571 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
577 * If we didn't specify AGPx8, we can only do x4.
578 * If the hardware can't do x4, we're up shit creek, and never
579 * should have got this far.
581 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
582 if ((*bridge_agpstat & AGPSTAT3_4X) && (*vga_agpstat & AGPSTAT3_4X))
583 *bridge_agpstat |= AGPSTAT3_4X;
585 printk(KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
586 "[bridge_agpstat:%x vga_agpstat:%x fell back to:- bridge_agpstat:%x vga_agpstat:%x]\n",
587 origbridge, origvga, *bridge_agpstat, *vga_agpstat);
588 if (!(*bridge_agpstat & AGPSTAT3_4X))
589 printk(KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
590 if (!(*vga_agpstat & AGPSTAT3_4X))
591 printk(KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
597 /* Apply any errata. */
598 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
599 *bridge_agpstat &= ~AGPSTAT_FW;
601 if (agp_bridge->flags & AGP_ERRATA_SBA)
602 *bridge_agpstat &= ~AGPSTAT_SBA;
604 if (agp_bridge->flags & AGP_ERRATA_1X) {
605 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
606 *bridge_agpstat |= AGPSTAT2_1X;
612 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
613 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
614 * @requested_mode: requested agp_stat from userspace (Typically from X)
615 * @bridge_agpstat: current agp_stat from AGP bridge.
617 * This function will hunt for an AGP graphics card, and try to match
618 * the requested mode to the capabilities of both the bridge and the card.
620 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
622 struct pci_dev *device = NULL;
627 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
629 printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
632 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
638 * Ok, here we have a AGP device. Disable impossible
639 * settings, and adjust the readqueue to the minimum.
641 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
643 /* adjust RQ depth */
644 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
645 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
646 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
648 /* disable FW if it's not supported */
649 if (!((bridge_agpstat & AGPSTAT_FW) &&
650 (vga_agpstat & AGPSTAT_FW) &&
651 (requested_mode & AGPSTAT_FW)))
652 bridge_agpstat &= ~AGPSTAT_FW;
654 /* Check to see if we are operating in 3.0 mode */
655 if (agp_bridge->mode & AGPSTAT_MODE_3_0)
656 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
658 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
661 return bridge_agpstat;
663 EXPORT_SYMBOL(agp_collect_device_status);
666 void agp_device_command(u32 bridge_agpstat, int agp_v3)
668 struct pci_dev *device = NULL;
671 mode = bridge_agpstat & 0x7;
675 for_each_pci_dev(device) {
676 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
680 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
681 agp_v3 ? 3 : 2, pci_name(device), mode);
682 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
685 EXPORT_SYMBOL(agp_device_command);
688 void get_agp_version(struct agp_bridge_data *bridge)
692 /* Exit early if already set by errata workarounds. */
693 if (bridge->major_version != 0)
696 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
697 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
698 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
700 EXPORT_SYMBOL(get_agp_version);
703 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
705 u32 bridge_agpstat, temp;
707 get_agp_version(agp_bridge);
709 printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
710 agp_bridge->major_version,
711 agp_bridge->minor_version,
712 pci_name(agp_bridge->dev));
714 pci_read_config_dword(agp_bridge->dev,
715 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
717 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
718 if (bridge_agpstat == 0)
719 /* Something bad happened. FIXME: Return error code? */
722 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
724 /* Do AGP version specific frobbing. */
725 if (bridge->major_version >= 3) {
726 if (bridge->mode & AGPSTAT_MODE_3_0) {
727 /* If we have 3.5, we can do the isoch stuff. */
728 if (bridge->minor_version >= 5)
729 agp_3_5_enable(bridge);
730 agp_device_command(bridge_agpstat, TRUE);
733 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
734 bridge_agpstat &= ~(7<<10) ;
735 pci_read_config_dword(bridge->dev,
736 bridge->capndx+AGPCTRL, &temp);
738 pci_write_config_dword(bridge->dev,
739 bridge->capndx+AGPCTRL, temp);
741 printk(KERN_INFO PFX "Device is in legacy mode,"
742 " falling back to 2.x\n");
747 agp_device_command(bridge_agpstat, FALSE);
749 EXPORT_SYMBOL(agp_generic_enable);
752 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
763 /* The generic routines can't handle 2 level gatt's */
764 if (bridge->driver->size_type == LVL2_APER_SIZE)
768 i = bridge->aperture_size_idx;
769 temp = bridge->current_size;
770 size = page_order = num_entries = 0;
772 if (bridge->driver->size_type != FIXED_APER_SIZE) {
774 switch (bridge->driver->size_type) {
776 size = A_SIZE_8(temp)->size;
778 A_SIZE_8(temp)->page_order;
780 A_SIZE_8(temp)->num_entries;
783 size = A_SIZE_16(temp)->size;
784 page_order = A_SIZE_16(temp)->page_order;
785 num_entries = A_SIZE_16(temp)->num_entries;
788 size = A_SIZE_32(temp)->size;
789 page_order = A_SIZE_32(temp)->page_order;
790 num_entries = A_SIZE_32(temp)->num_entries;
792 /* This case will never really happen. */
793 case FIXED_APER_SIZE:
796 size = page_order = num_entries = 0;
800 table = alloc_gatt_pages(page_order);
804 switch (bridge->driver->size_type) {
806 bridge->current_size = A_IDX8(bridge);
809 bridge->current_size = A_IDX16(bridge);
812 bridge->current_size = A_IDX32(bridge);
814 /* This case will never really happen. */
815 case FIXED_APER_SIZE:
818 bridge->current_size =
819 bridge->current_size;
822 temp = bridge->current_size;
824 bridge->aperture_size_idx = i;
826 } while (!table && (i < bridge->driver->num_aperture_sizes));
828 size = ((struct aper_size_info_fixed *) temp)->size;
829 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
830 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
831 table = alloc_gatt_pages(page_order);
837 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
839 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
840 SetPageReserved(page);
842 bridge->gatt_table_real = (u32 *) table;
843 agp_gatt_table = (void *)table;
845 bridge->driver->cache_flush();
846 bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
847 (PAGE_SIZE * (1 << page_order)));
848 bridge->driver->cache_flush();
850 if (bridge->gatt_table == NULL) {
851 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
852 ClearPageReserved(page);
854 free_gatt_pages(table, page_order);
858 bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
860 /* AK: bogus, should encode addresses > 4GB */
861 for (i = 0; i < num_entries; i++) {
862 writel(bridge->scratch_page, bridge->gatt_table+i);
863 readl(bridge->gatt_table+i); /* PCI Posting. */
868 EXPORT_SYMBOL(agp_generic_create_gatt_table);
870 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
873 char *table, *table_end;
877 temp = bridge->current_size;
879 switch (bridge->driver->size_type) {
881 page_order = A_SIZE_8(temp)->page_order;
884 page_order = A_SIZE_16(temp)->page_order;
887 page_order = A_SIZE_32(temp)->page_order;
889 case FIXED_APER_SIZE:
890 page_order = A_SIZE_FIX(temp)->page_order;
893 /* The generic routines can't deal with 2 level gatt's */
901 /* Do not worry about freeing memory, because if this is
902 * called, then all agp memory is deallocated and removed
905 iounmap(bridge->gatt_table);
906 table = (char *) bridge->gatt_table_real;
907 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
909 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
910 ClearPageReserved(page);
912 free_gatt_pages(bridge->gatt_table_real, page_order);
914 agp_gatt_table = NULL;
915 bridge->gatt_table = NULL;
916 bridge->gatt_table_real = NULL;
917 bridge->gatt_bus_addr = 0;
921 EXPORT_SYMBOL(agp_generic_free_gatt_table);
924 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
930 struct agp_bridge_data *bridge;
932 bridge = mem->bridge;
936 temp = bridge->current_size;
938 switch (bridge->driver->size_type) {
940 num_entries = A_SIZE_8(temp)->num_entries;
943 num_entries = A_SIZE_16(temp)->num_entries;
946 num_entries = A_SIZE_32(temp)->num_entries;
948 case FIXED_APER_SIZE:
949 num_entries = A_SIZE_FIX(temp)->num_entries;
952 /* The generic routines can't deal with 2 level gatt's */
960 num_entries -= agp_memory_reserved/PAGE_SIZE;
961 if (num_entries < 0) num_entries = 0;
963 if (type != 0 || mem->type != 0) {
964 /* The generic routines know nothing of memory types */
969 if ((pg_start + mem->page_count) > num_entries)
974 while (j < (pg_start + mem->page_count)) {
975 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
980 if (mem->is_flushed == FALSE) {
981 bridge->driver->cache_flush();
982 mem->is_flushed = TRUE;
985 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
986 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mem->type), bridge->gatt_table+j);
987 readl(bridge->gatt_table+j); /* PCI Posting. */
990 bridge->driver->tlb_flush(mem);
993 EXPORT_SYMBOL(agp_generic_insert_memory);
996 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
999 struct agp_bridge_data *bridge;
1001 bridge = mem->bridge;
1005 if (type != 0 || mem->type != 0) {
1006 /* The generic routines know nothing of memory types */
1010 /* AK: bogus, should encode addresses > 4GB */
1011 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1012 writel(bridge->scratch_page, bridge->gatt_table+i);
1013 readl(bridge->gatt_table+i); /* PCI Posting. */
1016 global_cache_flush();
1017 bridge->driver->tlb_flush(mem);
1020 EXPORT_SYMBOL(agp_generic_remove_memory);
1023 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1027 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1030 void agp_generic_free_by_type(struct agp_memory *curr)
1032 vfree(curr->memory);
1033 agp_free_key(curr->key);
1036 EXPORT_SYMBOL(agp_generic_free_by_type);
1040 * Basic Page Allocation Routines -
1041 * These routines handle page allocation and by default they reserve the allocated
1042 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1043 * against a maximum value.
1046 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1050 page = alloc_page(GFP_KERNEL);
1054 map_page_into_agp(page);
1057 SetPageLocked(page);
1058 atomic_inc(&agp_bridge->current_memory_agp);
1059 return page_address(page);
1061 EXPORT_SYMBOL(agp_generic_alloc_page);
1064 void agp_generic_destroy_page(void *addr)
1071 page = virt_to_page(addr);
1072 unmap_page_from_agp(page);
1075 free_page((unsigned long)addr);
1076 atomic_dec(&agp_bridge->current_memory_agp);
1078 EXPORT_SYMBOL(agp_generic_destroy_page);
1080 /* End Basic Page Allocation Routines */
1084 * agp_enable - initialise the agp point-to-point connection.
1086 * @mode: agp mode register value to configure with.
1088 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1092 bridge->driver->agp_enable(bridge, mode);
1094 EXPORT_SYMBOL(agp_enable);
1096 /* When we remove the global variable agp_bridge from all drivers
1097 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1100 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1102 if (list_empty(&agp_bridges))
1108 static void ipi_handler(void *null)
1113 void global_cache_flush(void)
1115 if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1116 panic(PFX "timed out waiting for the other CPUs!\n");
1118 EXPORT_SYMBOL(global_cache_flush);
1120 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1121 unsigned long addr, int type)
1123 /* memory type is ignored in the generic routine */
1124 if (bridge->driver->masks)
1125 return addr | bridge->driver->masks[0].mask;
1129 EXPORT_SYMBOL(agp_generic_mask_memory);
1132 * These functions are implemented according to the AGPv3 spec,
1133 * which covers implementation details that had previously been
1137 int agp3_generic_fetch_size(void)
1141 struct aper_size_info_16 *values;
1143 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1144 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1146 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1147 if (temp_size == values[i].size_value) {
1148 agp_bridge->previous_size =
1149 agp_bridge->current_size = (void *) (values + i);
1151 agp_bridge->aperture_size_idx = i;
1152 return values[i].size;
1157 EXPORT_SYMBOL(agp3_generic_fetch_size);
1159 void agp3_generic_tlbflush(struct agp_memory *mem)
1162 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1163 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1164 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1166 EXPORT_SYMBOL(agp3_generic_tlbflush);
1168 int agp3_generic_configure(void)
1171 struct aper_size_info_16 *current_size;
1173 current_size = A_SIZE_16(agp_bridge->current_size);
1175 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1176 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1178 /* set aperture size */
1179 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1180 /* set gart pointer */
1181 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1182 /* enable aperture and GTLB */
1183 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1184 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1187 EXPORT_SYMBOL(agp3_generic_configure);
1189 void agp3_generic_cleanup(void)
1192 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1193 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1195 EXPORT_SYMBOL(agp3_generic_cleanup);
1197 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1199 {4096, 1048576, 10,0x000},
1200 {2048, 524288, 9, 0x800},
1201 {1024, 262144, 8, 0xc00},
1202 { 512, 131072, 7, 0xe00},
1203 { 256, 65536, 6, 0xf00},
1204 { 128, 32768, 5, 0xf20},
1205 { 64, 16384, 4, 0xf30},
1206 { 32, 8192, 3, 0xf38},
1207 { 16, 4096, 2, 0xf3c},
1208 { 8, 2048, 1, 0xf3e},
1209 { 4, 1024, 0, 0xf3f}
1211 EXPORT_SYMBOL(agp3_generic_sizes);