2 * AGPGART driver frontend
3 * Copyright (C) 2004 Silicon Graphics, Inc.
4 * Copyright (C) 2002-2003 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.
29 #include <linux/types.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/mman.h>
33 #include <linux/pci.h>
34 #include <linux/init.h>
35 #include <linux/miscdevice.h>
36 #include <linux/agp_backend.h>
37 #include <linux/agpgart.h>
38 #include <linux/slab.h>
41 #include <linux/sched.h>
42 #include <asm/uaccess.h>
43 #include <asm/pgtable.h>
46 struct agp_front_data agp_fe;
48 struct agp_memory *agp_find_mem_by_key(int key)
50 struct agp_memory *curr;
52 if (agp_fe.current_controller == NULL)
55 curr = agp_fe.current_controller->pool;
57 while (curr != NULL) {
63 DBG("key=%d -> mem=%p", key, curr);
67 static void agp_remove_from_pool(struct agp_memory *temp)
69 struct agp_memory *prev;
70 struct agp_memory *next;
72 /* Check to see if this is even in the memory pool */
75 if (agp_find_mem_by_key(temp->key) != NULL) {
85 /* This is the first item on the list */
89 agp_fe.current_controller->pool = next;
95 * Routines for managing each client's segment list -
96 * These routines handle adding and removing segments
97 * to each auth'ed client.
101 agp_segment_priv *agp_find_seg_in_client(const struct agp_client *client,
102 unsigned long offset,
103 int size, pgprot_t page_prot)
105 struct agp_segment_priv *seg;
110 pg_start = offset / 4096;
111 pg_count = size / 4096;
112 seg = *(client->segments);
113 num_segments = client->num_segments;
115 for (i = 0; i < client->num_segments; i++) {
116 if ((seg[i].pg_start == pg_start) &&
117 (seg[i].pg_count == pg_count) &&
118 (pgprot_val(seg[i].prot) == pgprot_val(page_prot))) {
126 static void agp_remove_seg_from_client(struct agp_client *client)
128 DBG("client=%p", client);
130 if (client->segments != NULL) {
131 if (*(client->segments) != NULL) {
132 DBG("Freeing %p from client %p", *(client->segments), client);
133 kfree(*(client->segments));
135 DBG("Freeing %p from client %p", client->segments, client);
136 kfree(client->segments);
137 client->segments = NULL;
141 static void agp_add_seg_to_client(struct agp_client *client,
142 struct agp_segment_priv ** seg, int num_segments)
144 struct agp_segment_priv **prev_seg;
146 prev_seg = client->segments;
148 if (prev_seg != NULL)
149 agp_remove_seg_from_client(client);
151 DBG("Adding seg %p (%d segments) to client %p", seg, num_segments, client);
152 client->num_segments = num_segments;
153 client->segments = seg;
156 static pgprot_t agp_convert_mmap_flags(int prot)
158 unsigned long prot_bits;
160 prot_bits = calc_vm_prot_bits(prot) | VM_SHARED;
161 return vm_get_page_prot(prot_bits);
164 int agp_create_segment(struct agp_client *client, struct agp_region *region)
166 struct agp_segment_priv **ret_seg;
167 struct agp_segment_priv *seg;
168 struct agp_segment *user_seg;
171 seg = kzalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL);
173 kfree(region->seg_list);
174 region->seg_list = NULL;
177 user_seg = region->seg_list;
179 for (i = 0; i < region->seg_count; i++) {
180 seg[i].pg_start = user_seg[i].pg_start;
181 seg[i].pg_count = user_seg[i].pg_count;
182 seg[i].prot = agp_convert_mmap_flags(user_seg[i].prot);
184 kfree(region->seg_list);
185 region->seg_list = NULL;
187 ret_seg = kmalloc(sizeof(void *), GFP_KERNEL);
188 if (ret_seg == NULL) {
193 agp_add_seg_to_client(client, ret_seg, region->seg_count);
197 /* End - Routines for managing each client's segment list */
199 /* This function must only be called when current_controller != NULL */
200 static void agp_insert_into_pool(struct agp_memory * temp)
202 struct agp_memory *prev;
204 prev = agp_fe.current_controller->pool;
210 agp_fe.current_controller->pool = temp;
214 /* File private list routines */
216 struct agp_file_private *agp_find_private(pid_t pid)
218 struct agp_file_private *curr;
220 curr = agp_fe.file_priv_list;
222 while (curr != NULL) {
223 if (curr->my_pid == pid)
231 static void agp_insert_file_private(struct agp_file_private * priv)
233 struct agp_file_private *prev;
235 prev = agp_fe.file_priv_list;
240 agp_fe.file_priv_list = priv;
243 static void agp_remove_file_private(struct agp_file_private * priv)
245 struct agp_file_private *next;
246 struct agp_file_private *prev;
261 agp_fe.file_priv_list = next;
265 /* End - File flag list routines */
268 * Wrappers for agp_free_memory & agp_allocate_memory
269 * These make sure that internal lists are kept updated.
271 void agp_free_memory_wrap(struct agp_memory *memory)
273 agp_remove_from_pool(memory);
274 agp_free_memory(memory);
277 struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type)
279 struct agp_memory *memory;
281 memory = agp_allocate_memory(agp_bridge, pg_count, type);
285 agp_insert_into_pool(memory);
289 /* Routines for managing the list of controllers -
290 * These routines manage the current controller, and the list of
294 static struct agp_controller *agp_find_controller_by_pid(pid_t id)
296 struct agp_controller *controller;
298 controller = agp_fe.controllers;
300 while (controller != NULL) {
301 if (controller->pid == id)
303 controller = controller->next;
309 static struct agp_controller *agp_create_controller(pid_t id)
311 struct agp_controller *controller;
313 controller = kzalloc(sizeof(struct agp_controller), GFP_KERNEL);
314 if (controller == NULL)
317 controller->pid = id;
321 static int agp_insert_controller(struct agp_controller *controller)
323 struct agp_controller *prev_controller;
325 prev_controller = agp_fe.controllers;
326 controller->next = prev_controller;
328 if (prev_controller != NULL)
329 prev_controller->prev = controller;
331 agp_fe.controllers = controller;
336 static void agp_remove_all_clients(struct agp_controller *controller)
338 struct agp_client *client;
339 struct agp_client *temp;
341 client = controller->clients;
344 struct agp_file_private *priv;
347 agp_remove_seg_from_client(temp);
348 priv = agp_find_private(temp->pid);
351 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
352 clear_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
354 client = client->next;
359 static void agp_remove_all_memory(struct agp_controller *controller)
361 struct agp_memory *memory;
362 struct agp_memory *temp;
364 memory = controller->pool;
368 memory = memory->next;
369 agp_free_memory_wrap(temp);
373 static int agp_remove_controller(struct agp_controller *controller)
375 struct agp_controller *prev_controller;
376 struct agp_controller *next_controller;
378 prev_controller = controller->prev;
379 next_controller = controller->next;
381 if (prev_controller != NULL) {
382 prev_controller->next = next_controller;
383 if (next_controller != NULL)
384 next_controller->prev = prev_controller;
387 if (next_controller != NULL)
388 next_controller->prev = NULL;
390 agp_fe.controllers = next_controller;
393 agp_remove_all_memory(controller);
394 agp_remove_all_clients(controller);
396 if (agp_fe.current_controller == controller) {
397 agp_fe.current_controller = NULL;
398 agp_fe.backend_acquired = FALSE;
399 agp_backend_release(agp_bridge);
405 static void agp_controller_make_current(struct agp_controller *controller)
407 struct agp_client *clients;
409 clients = controller->clients;
411 while (clients != NULL) {
412 struct agp_file_private *priv;
414 priv = agp_find_private(clients->pid);
417 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
418 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
420 clients = clients->next;
423 agp_fe.current_controller = controller;
426 static void agp_controller_release_current(struct agp_controller *controller,
427 struct agp_file_private *controller_priv)
429 struct agp_client *clients;
431 clear_bit(AGP_FF_IS_VALID, &controller_priv->access_flags);
432 clients = controller->clients;
434 while (clients != NULL) {
435 struct agp_file_private *priv;
437 priv = agp_find_private(clients->pid);
440 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
442 clients = clients->next;
445 agp_fe.current_controller = NULL;
446 agp_fe.used_by_controller = FALSE;
447 agp_backend_release(agp_bridge);
451 * Routines for managing client lists -
452 * These routines are for managing the list of auth'ed clients.
455 static struct agp_client
456 *agp_find_client_in_controller(struct agp_controller *controller, pid_t id)
458 struct agp_client *client;
460 if (controller == NULL)
463 client = controller->clients;
465 while (client != NULL) {
466 if (client->pid == id)
468 client = client->next;
474 static struct agp_controller *agp_find_controller_for_client(pid_t id)
476 struct agp_controller *controller;
478 controller = agp_fe.controllers;
480 while (controller != NULL) {
481 if ((agp_find_client_in_controller(controller, id)) != NULL)
483 controller = controller->next;
489 struct agp_client *agp_find_client_by_pid(pid_t id)
491 struct agp_client *temp;
493 if (agp_fe.current_controller == NULL)
496 temp = agp_find_client_in_controller(agp_fe.current_controller, id);
500 static void agp_insert_client(struct agp_client *client)
502 struct agp_client *prev_client;
504 prev_client = agp_fe.current_controller->clients;
505 client->next = prev_client;
507 if (prev_client != NULL)
508 prev_client->prev = client;
510 agp_fe.current_controller->clients = client;
511 agp_fe.current_controller->num_clients++;
514 struct agp_client *agp_create_client(pid_t id)
516 struct agp_client *new_client;
518 new_client = kzalloc(sizeof(struct agp_client), GFP_KERNEL);
519 if (new_client == NULL)
522 new_client->pid = id;
523 agp_insert_client(new_client);
527 int agp_remove_client(pid_t id)
529 struct agp_client *client;
530 struct agp_client *prev_client;
531 struct agp_client *next_client;
532 struct agp_controller *controller;
534 controller = agp_find_controller_for_client(id);
535 if (controller == NULL)
538 client = agp_find_client_in_controller(controller, id);
542 prev_client = client->prev;
543 next_client = client->next;
545 if (prev_client != NULL) {
546 prev_client->next = next_client;
547 if (next_client != NULL)
548 next_client->prev = prev_client;
551 if (next_client != NULL)
552 next_client->prev = NULL;
553 controller->clients = next_client;
556 controller->num_clients--;
557 agp_remove_seg_from_client(client);
562 /* End - Routines for managing client lists */
564 /* File Operations */
566 static int agp_mmap(struct file *file, struct vm_area_struct *vma)
568 unsigned int size, current_size;
569 unsigned long offset;
570 struct agp_client *client;
571 struct agp_file_private *priv = file->private_data;
572 struct agp_kern_info kerninfo;
574 mutex_lock(&(agp_fe.agp_mutex));
576 if (agp_fe.backend_acquired != TRUE)
579 if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags)))
582 agp_copy_info(agp_bridge, &kerninfo);
583 size = vma->vm_end - vma->vm_start;
584 current_size = kerninfo.aper_size;
585 current_size = current_size * 0x100000;
586 offset = vma->vm_pgoff << PAGE_SHIFT;
587 DBG("%lx:%lx", offset, offset+size);
589 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) {
590 if ((size + offset) > current_size)
593 client = agp_find_client_by_pid(current->pid);
598 if (!agp_find_seg_in_client(client, offset, size, vma->vm_page_prot))
601 DBG("client vm_ops=%p", kerninfo.vm_ops);
602 if (kerninfo.vm_ops) {
603 vma->vm_ops = kerninfo.vm_ops;
604 } else if (io_remap_pfn_range(vma, vma->vm_start,
605 (kerninfo.aper_base + offset) >> PAGE_SHIFT,
606 size, vma->vm_page_prot)) {
609 mutex_unlock(&(agp_fe.agp_mutex));
613 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
614 if (size != current_size)
617 DBG("controller vm_ops=%p", kerninfo.vm_ops);
618 if (kerninfo.vm_ops) {
619 vma->vm_ops = kerninfo.vm_ops;
620 } else if (io_remap_pfn_range(vma, vma->vm_start,
621 kerninfo.aper_base >> PAGE_SHIFT,
622 size, vma->vm_page_prot)) {
625 mutex_unlock(&(agp_fe.agp_mutex));
630 mutex_unlock(&(agp_fe.agp_mutex));
634 mutex_unlock(&(agp_fe.agp_mutex));
638 mutex_unlock(&(agp_fe.agp_mutex));
642 static int agp_release(struct inode *inode, struct file *file)
644 struct agp_file_private *priv = file->private_data;
646 mutex_lock(&(agp_fe.agp_mutex));
648 DBG("priv=%p", priv);
650 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
651 struct agp_controller *controller;
653 controller = agp_find_controller_by_pid(priv->my_pid);
655 if (controller != NULL) {
656 if (controller == agp_fe.current_controller)
657 agp_controller_release_current(controller, priv);
658 agp_remove_controller(controller);
663 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags))
664 agp_remove_client(priv->my_pid);
666 agp_remove_file_private(priv);
668 file->private_data = NULL;
669 mutex_unlock(&(agp_fe.agp_mutex));
673 static int agp_open(struct inode *inode, struct file *file)
675 int minor = iminor(inode);
676 struct agp_file_private *priv;
677 struct agp_client *client;
680 mutex_lock(&(agp_fe.agp_mutex));
682 if (minor != AGPGART_MINOR)
685 priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL);
689 set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags);
690 priv->my_pid = current->pid;
692 if ((current->uid == 0) || (current->suid == 0)) {
693 /* Root priv, can be controller */
694 set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags);
696 client = agp_find_client_by_pid(current->pid);
698 if (client != NULL) {
699 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
700 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
702 file->private_data = (void *) priv;
703 agp_insert_file_private(priv);
704 DBG("private=%p, client=%p", priv, client);
705 mutex_unlock(&(agp_fe.agp_mutex));
711 mutex_unlock(&(agp_fe.agp_mutex));
716 static ssize_t agp_read(struct file *file, char __user *buf,
717 size_t count, loff_t * ppos)
722 static ssize_t agp_write(struct file *file, const char __user *buf,
723 size_t count, loff_t * ppos)
728 static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
730 struct agp_info userinfo;
731 struct agp_kern_info kerninfo;
733 agp_copy_info(agp_bridge, &kerninfo);
735 userinfo.version.major = kerninfo.version.major;
736 userinfo.version.minor = kerninfo.version.minor;
737 userinfo.bridge_id = kerninfo.device->vendor |
738 (kerninfo.device->device << 16);
739 userinfo.agp_mode = kerninfo.mode;
740 userinfo.aper_base = kerninfo.aper_base;
741 userinfo.aper_size = kerninfo.aper_size;
742 userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory;
743 userinfo.pg_used = kerninfo.current_memory;
745 if (copy_to_user(arg, &userinfo, sizeof(struct agp_info)))
751 int agpioc_acquire_wrap(struct agp_file_private *priv)
753 struct agp_controller *controller;
757 if (!(test_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags)))
760 if (agp_fe.current_controller != NULL)
766 if (atomic_read(&agp_bridge->agp_in_use))
769 atomic_inc(&agp_bridge->agp_in_use);
771 agp_fe.backend_acquired = TRUE;
773 controller = agp_find_controller_by_pid(priv->my_pid);
775 if (controller != NULL) {
776 agp_controller_make_current(controller);
778 controller = agp_create_controller(priv->my_pid);
780 if (controller == NULL) {
781 agp_fe.backend_acquired = FALSE;
782 agp_backend_release(agp_bridge);
785 agp_insert_controller(controller);
786 agp_controller_make_current(controller);
789 set_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags);
790 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
794 int agpioc_release_wrap(struct agp_file_private *priv)
797 agp_controller_release_current(agp_fe.current_controller, priv);
801 int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg)
803 struct agp_setup mode;
806 if (copy_from_user(&mode, arg, sizeof(struct agp_setup)))
809 agp_enable(agp_bridge, mode.agp_mode);
813 static int agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg)
815 struct agp_region reserve;
816 struct agp_client *client;
817 struct agp_file_private *client_priv;
820 if (copy_from_user(&reserve, arg, sizeof(struct agp_region)))
823 if ((unsigned) reserve.seg_count >= ~0U/sizeof(struct agp_segment))
826 client = agp_find_client_by_pid(reserve.pid);
828 if (reserve.seg_count == 0) {
829 /* remove a client */
830 client_priv = agp_find_private(reserve.pid);
832 if (client_priv != NULL) {
833 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
834 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
836 if (client == NULL) {
837 /* client is already removed */
840 return agp_remove_client(reserve.pid);
842 struct agp_segment *segment;
844 if (reserve.seg_count >= 16384)
847 segment = kmalloc((sizeof(struct agp_segment) * reserve.seg_count),
853 if (copy_from_user(segment, (void __user *) reserve.seg_list,
854 sizeof(struct agp_segment) * reserve.seg_count)) {
858 reserve.seg_list = segment;
860 if (client == NULL) {
861 /* Create the client and add the segment */
862 client = agp_create_client(reserve.pid);
864 if (client == NULL) {
868 client_priv = agp_find_private(reserve.pid);
870 if (client_priv != NULL) {
871 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
872 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
875 return agp_create_segment(client, &reserve);
877 /* Will never really happen */
881 int agpioc_protect_wrap(struct agp_file_private *priv)
884 /* This function is not currently implemented */
888 static int agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg)
890 struct agp_memory *memory;
891 struct agp_allocate alloc;
894 if (copy_from_user(&alloc, arg, sizeof(struct agp_allocate)))
897 if (alloc.type >= AGP_USER_TYPES)
900 memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);
905 alloc.key = memory->key;
906 alloc.physical = memory->physical;
908 if (copy_to_user(arg, &alloc, sizeof(struct agp_allocate))) {
909 agp_free_memory_wrap(memory);
915 int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg)
917 struct agp_memory *memory;
920 memory = agp_find_mem_by_key(arg);
925 agp_free_memory_wrap(memory);
929 static int agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg)
931 struct agp_bind bind_info;
932 struct agp_memory *memory;
935 if (copy_from_user(&bind_info, arg, sizeof(struct agp_bind)))
938 memory = agp_find_mem_by_key(bind_info.key);
943 return agp_bind_memory(memory, bind_info.pg_start);
946 static int agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg)
948 struct agp_memory *memory;
949 struct agp_unbind unbind;
952 if (copy_from_user(&unbind, arg, sizeof(struct agp_unbind)))
955 memory = agp_find_mem_by_key(unbind.key);
960 return agp_unbind_memory(memory);
963 static int agp_ioctl(struct inode *inode, struct file *file,
964 unsigned int cmd, unsigned long arg)
966 struct agp_file_private *curr_priv = file->private_data;
967 int ret_val = -ENOTTY;
969 DBG("priv=%p, cmd=%x", curr_priv, cmd);
970 mutex_lock(&(agp_fe.agp_mutex));
972 if ((agp_fe.current_controller == NULL) &&
973 (cmd != AGPIOC_ACQUIRE)) {
977 if ((agp_fe.backend_acquired != TRUE) &&
978 (cmd != AGPIOC_ACQUIRE)) {
982 if (cmd != AGPIOC_ACQUIRE) {
983 if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) {
987 /* Use the original pid of the controller,
988 * in case it's threaded */
990 if (agp_fe.current_controller->pid != curr_priv->my_pid) {
998 ret_val = agpioc_info_wrap(curr_priv, (void __user *) arg);
1001 case AGPIOC_ACQUIRE:
1002 ret_val = agpioc_acquire_wrap(curr_priv);
1005 case AGPIOC_RELEASE:
1006 ret_val = agpioc_release_wrap(curr_priv);
1010 ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg);
1013 case AGPIOC_RESERVE:
1014 ret_val = agpioc_reserve_wrap(curr_priv, (void __user *) arg);
1017 case AGPIOC_PROTECT:
1018 ret_val = agpioc_protect_wrap(curr_priv);
1021 case AGPIOC_ALLOCATE:
1022 ret_val = agpioc_allocate_wrap(curr_priv, (void __user *) arg);
1025 case AGPIOC_DEALLOCATE:
1026 ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg);
1030 ret_val = agpioc_bind_wrap(curr_priv, (void __user *) arg);
1034 ret_val = agpioc_unbind_wrap(curr_priv, (void __user *) arg);
1039 DBG("ioctl returns %d\n", ret_val);
1040 mutex_unlock(&(agp_fe.agp_mutex));
1044 static const struct file_operations agp_fops =
1046 .owner = THIS_MODULE,
1047 .llseek = no_llseek,
1051 #ifdef CONFIG_COMPAT
1052 .compat_ioctl = compat_agp_ioctl,
1056 .release = agp_release,
1059 static struct miscdevice agp_miscdev =
1061 .minor = AGPGART_MINOR,
1066 int agp_frontend_initialize(void)
1068 memset(&agp_fe, 0, sizeof(struct agp_front_data));
1069 mutex_init(&(agp_fe.agp_mutex));
1071 if (misc_register(&agp_miscdev)) {
1072 printk(KERN_ERR PFX "unable to get minor: %d\n", AGPGART_MINOR);
1078 void agp_frontend_cleanup(void)
1080 misc_deregister(&agp_miscdev);