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1/*
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.
8 *
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:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
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.
26 *
27 */
28
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/miscdevice.h>
35#include <linux/agp_backend.h>
36#include <linux/agpgart.h>
37#include <linux/slab.h>
38#include <linux/mm.h>
39#include <linux/fs.h>
40#include <linux/sched.h>
41#include <linux/uaccess.h>
42
43#include "agp.h"
44#include "compat_ioctl.h"
45
46struct agp_front_data agp_fe;
47
48struct agp_memory *agp_find_mem_by_key(int key)
49{
50 struct agp_memory *curr;
51
52 if (agp_fe.current_controller == NULL)
53 return NULL;
54
55 curr = agp_fe.current_controller->pool;
56
57 while (curr != NULL) {
58 if (curr->key == key)
59 break;
60 curr = curr->next;
61 }
62
63 DBG("key=%d -> mem=%p", key, curr);
64 return curr;
65}
66
67static void agp_remove_from_pool(struct agp_memory *temp)
68{
69 struct agp_memory *prev;
70 struct agp_memory *next;
71
72 /* Check to see if this is even in the memory pool */
73
74 DBG("mem=%p", temp);
75 if (agp_find_mem_by_key(temp->key) != NULL) {
76 next = temp->next;
77 prev = temp->prev;
78
79 if (prev != NULL) {
80 prev->next = next;
81 if (next != NULL)
82 next->prev = prev;
83
84 } else {
85 /* This is the first item on the list */
86 if (next != NULL)
87 next->prev = NULL;
88
89 agp_fe.current_controller->pool = next;
90 }
91 }
92}
93
94/*
95 * Routines for managing each client's segment list -
96 * These routines handle adding and removing segments
97 * to each auth'ed client.
98 */
99
100static struct
101agp_segment_priv *agp_find_seg_in_client(const struct agp_client *client,
102 unsigned long offset,
103 int size, pgprot_t page_prot)
104{
105 struct agp_segment_priv *seg;
106 int i;
107 off_t pg_start;
108 size_t pg_count;
109
110 pg_start = offset / 4096;
111 pg_count = size / 4096;
112 seg = *(client->segments);
113
114 for (i = 0; i < client->num_segments; i++) {
115 if ((seg[i].pg_start == pg_start) &&
116 (seg[i].pg_count == pg_count) &&
117 (pgprot_val(seg[i].prot) == pgprot_val(page_prot))) {
118 return seg + i;
119 }
120 }
121
122 return NULL;
123}
124
125static void agp_remove_seg_from_client(struct agp_client *client)
126{
127 DBG("client=%p", client);
128
129 if (client->segments != NULL) {
130 if (*(client->segments) != NULL) {
131 DBG("Freeing %p from client %p", *(client->segments), client);
132 kfree(*(client->segments));
133 }
134 DBG("Freeing %p from client %p", client->segments, client);
135 kfree(client->segments);
136 client->segments = NULL;
137 }
138}
139
140static void agp_add_seg_to_client(struct agp_client *client,
141 struct agp_segment_priv ** seg, int num_segments)
142{
143 struct agp_segment_priv **prev_seg;
144
145 prev_seg = client->segments;
146
147 if (prev_seg != NULL)
148 agp_remove_seg_from_client(client);
149
150 DBG("Adding seg %p (%d segments) to client %p", seg, num_segments, client);
151 client->num_segments = num_segments;
152 client->segments = seg;
153}
154
155static pgprot_t agp_convert_mmap_flags(int prot)
156{
157 unsigned long prot_bits;
158
159 prot_bits = calc_vm_prot_bits(prot, 0) | VM_SHARED;
160 return vm_get_page_prot(prot_bits);
161}
162
163int agp_create_segment(struct agp_client *client, struct agp_region *region)
164{
165 struct agp_segment_priv **ret_seg;
166 struct agp_segment_priv *seg;
167 struct agp_segment *user_seg;
168 size_t i;
169
170 seg = kzalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL);
171 if (seg == NULL) {
172 kfree(region->seg_list);
173 region->seg_list = NULL;
174 return -ENOMEM;
175 }
176 user_seg = region->seg_list;
177
178 for (i = 0; i < region->seg_count; i++) {
179 seg[i].pg_start = user_seg[i].pg_start;
180 seg[i].pg_count = user_seg[i].pg_count;
181 seg[i].prot = agp_convert_mmap_flags(user_seg[i].prot);
182 }
183 kfree(region->seg_list);
184 region->seg_list = NULL;
185
186 ret_seg = kmalloc(sizeof(void *), GFP_KERNEL);
187 if (ret_seg == NULL) {
188 kfree(seg);
189 return -ENOMEM;
190 }
191 *ret_seg = seg;
192 agp_add_seg_to_client(client, ret_seg, region->seg_count);
193 return 0;
194}
195
196/* End - Routines for managing each client's segment list */
197
198/* This function must only be called when current_controller != NULL */
199static void agp_insert_into_pool(struct agp_memory * temp)
200{
201 struct agp_memory *prev;
202
203 prev = agp_fe.current_controller->pool;
204
205 if (prev != NULL) {
206 prev->prev = temp;
207 temp->next = prev;
208 }
209 agp_fe.current_controller->pool = temp;
210}
211
212
213/* File private list routines */
214
215struct agp_file_private *agp_find_private(pid_t pid)
216{
217 struct agp_file_private *curr;
218
219 curr = agp_fe.file_priv_list;
220
221 while (curr != NULL) {
222 if (curr->my_pid == pid)
223 return curr;
224 curr = curr->next;
225 }
226
227 return NULL;
228}
229
230static void agp_insert_file_private(struct agp_file_private * priv)
231{
232 struct agp_file_private *prev;
233
234 prev = agp_fe.file_priv_list;
235
236 if (prev != NULL)
237 prev->prev = priv;
238 priv->next = prev;
239 agp_fe.file_priv_list = priv;
240}
241
242static void agp_remove_file_private(struct agp_file_private * priv)
243{
244 struct agp_file_private *next;
245 struct agp_file_private *prev;
246
247 next = priv->next;
248 prev = priv->prev;
249
250 if (prev != NULL) {
251 prev->next = next;
252
253 if (next != NULL)
254 next->prev = prev;
255
256 } else {
257 if (next != NULL)
258 next->prev = NULL;
259
260 agp_fe.file_priv_list = next;
261 }
262}
263
264/* End - File flag list routines */
265
266/*
267 * Wrappers for agp_free_memory & agp_allocate_memory
268 * These make sure that internal lists are kept updated.
269 */
270void agp_free_memory_wrap(struct agp_memory *memory)
271{
272 agp_remove_from_pool(memory);
273 agp_free_memory(memory);
274}
275
276struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type)
277{
278 struct agp_memory *memory;
279
280 memory = agp_allocate_memory(agp_bridge, pg_count, type);
281 if (memory == NULL)
282 return NULL;
283
284 agp_insert_into_pool(memory);
285 return memory;
286}
287
288/* Routines for managing the list of controllers -
289 * These routines manage the current controller, and the list of
290 * controllers
291 */
292
293static struct agp_controller *agp_find_controller_by_pid(pid_t id)
294{
295 struct agp_controller *controller;
296
297 controller = agp_fe.controllers;
298
299 while (controller != NULL) {
300 if (controller->pid == id)
301 return controller;
302 controller = controller->next;
303 }
304
305 return NULL;
306}
307
308static struct agp_controller *agp_create_controller(pid_t id)
309{
310 struct agp_controller *controller;
311
312 controller = kzalloc(sizeof(struct agp_controller), GFP_KERNEL);
313 if (controller == NULL)
314 return NULL;
315
316 controller->pid = id;
317 return controller;
318}
319
320static int agp_insert_controller(struct agp_controller *controller)
321{
322 struct agp_controller *prev_controller;
323
324 prev_controller = agp_fe.controllers;
325 controller->next = prev_controller;
326
327 if (prev_controller != NULL)
328 prev_controller->prev = controller;
329
330 agp_fe.controllers = controller;
331
332 return 0;
333}
334
335static void agp_remove_all_clients(struct agp_controller *controller)
336{
337 struct agp_client *client;
338 struct agp_client *temp;
339
340 client = controller->clients;
341
342 while (client) {
343 struct agp_file_private *priv;
344
345 temp = client;
346 agp_remove_seg_from_client(temp);
347 priv = agp_find_private(temp->pid);
348
349 if (priv != NULL) {
350 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
351 clear_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
352 }
353 client = client->next;
354 kfree(temp);
355 }
356}
357
358static void agp_remove_all_memory(struct agp_controller *controller)
359{
360 struct agp_memory *memory;
361 struct agp_memory *temp;
362
363 memory = controller->pool;
364
365 while (memory) {
366 temp = memory;
367 memory = memory->next;
368 agp_free_memory_wrap(temp);
369 }
370}
371
372static int agp_remove_controller(struct agp_controller *controller)
373{
374 struct agp_controller *prev_controller;
375 struct agp_controller *next_controller;
376
377 prev_controller = controller->prev;
378 next_controller = controller->next;
379
380 if (prev_controller != NULL) {
381 prev_controller->next = next_controller;
382 if (next_controller != NULL)
383 next_controller->prev = prev_controller;
384
385 } else {
386 if (next_controller != NULL)
387 next_controller->prev = NULL;
388
389 agp_fe.controllers = next_controller;
390 }
391
392 agp_remove_all_memory(controller);
393 agp_remove_all_clients(controller);
394
395 if (agp_fe.current_controller == controller) {
396 agp_fe.current_controller = NULL;
397 agp_fe.backend_acquired = false;
398 agp_backend_release(agp_bridge);
399 }
400 kfree(controller);
401 return 0;
402}
403
404static void agp_controller_make_current(struct agp_controller *controller)
405{
406 struct agp_client *clients;
407
408 clients = controller->clients;
409
410 while (clients != NULL) {
411 struct agp_file_private *priv;
412
413 priv = agp_find_private(clients->pid);
414
415 if (priv != NULL) {
416 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
417 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
418 }
419 clients = clients->next;
420 }
421
422 agp_fe.current_controller = controller;
423}
424
425static void agp_controller_release_current(struct agp_controller *controller,
426 struct agp_file_private *controller_priv)
427{
428 struct agp_client *clients;
429
430 clear_bit(AGP_FF_IS_VALID, &controller_priv->access_flags);
431 clients = controller->clients;
432
433 while (clients != NULL) {
434 struct agp_file_private *priv;
435
436 priv = agp_find_private(clients->pid);
437
438 if (priv != NULL)
439 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
440
441 clients = clients->next;
442 }
443
444 agp_fe.current_controller = NULL;
445 agp_fe.used_by_controller = false;
446 agp_backend_release(agp_bridge);
447}
448
449/*
450 * Routines for managing client lists -
451 * These routines are for managing the list of auth'ed clients.
452 */
453
454static struct agp_client
455*agp_find_client_in_controller(struct agp_controller *controller, pid_t id)
456{
457 struct agp_client *client;
458
459 if (controller == NULL)
460 return NULL;
461
462 client = controller->clients;
463
464 while (client != NULL) {
465 if (client->pid == id)
466 return client;
467 client = client->next;
468 }
469
470 return NULL;
471}
472
473static struct agp_controller *agp_find_controller_for_client(pid_t id)
474{
475 struct agp_controller *controller;
476
477 controller = agp_fe.controllers;
478
479 while (controller != NULL) {
480 if ((agp_find_client_in_controller(controller, id)) != NULL)
481 return controller;
482 controller = controller->next;
483 }
484
485 return NULL;
486}
487
488struct agp_client *agp_find_client_by_pid(pid_t id)
489{
490 struct agp_client *temp;
491
492 if (agp_fe.current_controller == NULL)
493 return NULL;
494
495 temp = agp_find_client_in_controller(agp_fe.current_controller, id);
496 return temp;
497}
498
499static void agp_insert_client(struct agp_client *client)
500{
501 struct agp_client *prev_client;
502
503 prev_client = agp_fe.current_controller->clients;
504 client->next = prev_client;
505
506 if (prev_client != NULL)
507 prev_client->prev = client;
508
509 agp_fe.current_controller->clients = client;
510 agp_fe.current_controller->num_clients++;
511}
512
513struct agp_client *agp_create_client(pid_t id)
514{
515 struct agp_client *new_client;
516
517 new_client = kzalloc(sizeof(struct agp_client), GFP_KERNEL);
518 if (new_client == NULL)
519 return NULL;
520
521 new_client->pid = id;
522 agp_insert_client(new_client);
523 return new_client;
524}
525
526int agp_remove_client(pid_t id)
527{
528 struct agp_client *client;
529 struct agp_client *prev_client;
530 struct agp_client *next_client;
531 struct agp_controller *controller;
532
533 controller = agp_find_controller_for_client(id);
534 if (controller == NULL)
535 return -EINVAL;
536
537 client = agp_find_client_in_controller(controller, id);
538 if (client == NULL)
539 return -EINVAL;
540
541 prev_client = client->prev;
542 next_client = client->next;
543
544 if (prev_client != NULL) {
545 prev_client->next = next_client;
546 if (next_client != NULL)
547 next_client->prev = prev_client;
548
549 } else {
550 if (next_client != NULL)
551 next_client->prev = NULL;
552 controller->clients = next_client;
553 }
554
555 controller->num_clients--;
556 agp_remove_seg_from_client(client);
557 kfree(client);
558 return 0;
559}
560
561/* End - Routines for managing client lists */
562
563/* File Operations */
564
565static int agp_mmap(struct file *file, struct vm_area_struct *vma)
566{
567 unsigned int size, current_size;
568 unsigned long offset;
569 struct agp_client *client;
570 struct agp_file_private *priv = file->private_data;
571 struct agp_kern_info kerninfo;
572
573 mutex_lock(&(agp_fe.agp_mutex));
574
575 if (agp_fe.backend_acquired != true)
576 goto out_eperm;
577
578 if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags)))
579 goto out_eperm;
580
581 agp_copy_info(agp_bridge, &kerninfo);
582 size = vma->vm_end - vma->vm_start;
583 current_size = kerninfo.aper_size;
584 current_size = current_size * 0x100000;
585 offset = vma->vm_pgoff << PAGE_SHIFT;
586 DBG("%lx:%lx", offset, offset+size);
587
588 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) {
589 if ((size + offset) > current_size)
590 goto out_inval;
591
592 client = agp_find_client_by_pid(current->pid);
593
594 if (client == NULL)
595 goto out_eperm;
596
597 if (!agp_find_seg_in_client(client, offset, size, vma->vm_page_prot))
598 goto out_inval;
599
600 DBG("client vm_ops=%p", kerninfo.vm_ops);
601 if (kerninfo.vm_ops) {
602 vma->vm_ops = kerninfo.vm_ops;
603 } else if (io_remap_pfn_range(vma, vma->vm_start,
604 (kerninfo.aper_base + offset) >> PAGE_SHIFT,
605 size,
606 pgprot_writecombine(vma->vm_page_prot))) {
607 goto out_again;
608 }
609 mutex_unlock(&(agp_fe.agp_mutex));
610 return 0;
611 }
612
613 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
614 if (size != current_size)
615 goto out_inval;
616
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,
623 pgprot_writecombine(vma->vm_page_prot))) {
624 goto out_again;
625 }
626 mutex_unlock(&(agp_fe.agp_mutex));
627 return 0;
628 }
629
630out_eperm:
631 mutex_unlock(&(agp_fe.agp_mutex));
632 return -EPERM;
633
634out_inval:
635 mutex_unlock(&(agp_fe.agp_mutex));
636 return -EINVAL;
637
638out_again:
639 mutex_unlock(&(agp_fe.agp_mutex));
640 return -EAGAIN;
641}
642
643static int agp_release(struct inode *inode, struct file *file)
644{
645 struct agp_file_private *priv = file->private_data;
646
647 mutex_lock(&(agp_fe.agp_mutex));
648
649 DBG("priv=%p", priv);
650
651 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
652 struct agp_controller *controller;
653
654 controller = agp_find_controller_by_pid(priv->my_pid);
655
656 if (controller != NULL) {
657 if (controller == agp_fe.current_controller)
658 agp_controller_release_current(controller, priv);
659 agp_remove_controller(controller);
660 controller = NULL;
661 }
662 }
663
664 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags))
665 agp_remove_client(priv->my_pid);
666
667 agp_remove_file_private(priv);
668 kfree(priv);
669 file->private_data = NULL;
670 mutex_unlock(&(agp_fe.agp_mutex));
671 return 0;
672}
673
674static int agp_open(struct inode *inode, struct file *file)
675{
676 int minor = iminor(inode);
677 struct agp_file_private *priv;
678 struct agp_client *client;
679
680 if (minor != AGPGART_MINOR)
681 return -ENXIO;
682
683 mutex_lock(&(agp_fe.agp_mutex));
684
685 priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL);
686 if (priv == NULL) {
687 mutex_unlock(&(agp_fe.agp_mutex));
688 return -ENOMEM;
689 }
690
691 set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags);
692 priv->my_pid = current->pid;
693
694 if (capable(CAP_SYS_RAWIO))
695 /* Root priv, can be controller */
696 set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags);
697
698 client = agp_find_client_by_pid(current->pid);
699
700 if (client != NULL) {
701 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
702 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
703 }
704 file->private_data = (void *) priv;
705 agp_insert_file_private(priv);
706 DBG("private=%p, client=%p", priv, client);
707
708 mutex_unlock(&(agp_fe.agp_mutex));
709
710 return 0;
711}
712
713static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
714{
715 struct agp_info userinfo;
716 struct agp_kern_info kerninfo;
717
718 agp_copy_info(agp_bridge, &kerninfo);
719
720 memset(&userinfo, 0, sizeof(userinfo));
721 userinfo.version.major = kerninfo.version.major;
722 userinfo.version.minor = kerninfo.version.minor;
723 userinfo.bridge_id = kerninfo.device->vendor |
724 (kerninfo.device->device << 16);
725 userinfo.agp_mode = kerninfo.mode;
726 userinfo.aper_base = kerninfo.aper_base;
727 userinfo.aper_size = kerninfo.aper_size;
728 userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory;
729 userinfo.pg_used = kerninfo.current_memory;
730
731 if (copy_to_user(arg, &userinfo, sizeof(struct agp_info)))
732 return -EFAULT;
733
734 return 0;
735}
736
737int agpioc_acquire_wrap(struct agp_file_private *priv)
738{
739 struct agp_controller *controller;
740
741 DBG("");
742
743 if (!(test_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags)))
744 return -EPERM;
745
746 if (agp_fe.current_controller != NULL)
747 return -EBUSY;
748
749 if (!agp_bridge)
750 return -ENODEV;
751
752 if (atomic_read(&agp_bridge->agp_in_use))
753 return -EBUSY;
754
755 atomic_inc(&agp_bridge->agp_in_use);
756
757 agp_fe.backend_acquired = true;
758
759 controller = agp_find_controller_by_pid(priv->my_pid);
760
761 if (controller != NULL) {
762 agp_controller_make_current(controller);
763 } else {
764 controller = agp_create_controller(priv->my_pid);
765
766 if (controller == NULL) {
767 agp_fe.backend_acquired = false;
768 agp_backend_release(agp_bridge);
769 return -ENOMEM;
770 }
771 agp_insert_controller(controller);
772 agp_controller_make_current(controller);
773 }
774
775 set_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags);
776 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
777 return 0;
778}
779
780int agpioc_release_wrap(struct agp_file_private *priv)
781{
782 DBG("");
783 agp_controller_release_current(agp_fe.current_controller, priv);
784 return 0;
785}
786
787int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg)
788{
789 struct agp_setup mode;
790
791 DBG("");
792 if (copy_from_user(&mode, arg, sizeof(struct agp_setup)))
793 return -EFAULT;
794
795 agp_enable(agp_bridge, mode.agp_mode);
796 return 0;
797}
798
799static int agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg)
800{
801 struct agp_region reserve;
802 struct agp_client *client;
803 struct agp_file_private *client_priv;
804
805 DBG("");
806 if (copy_from_user(&reserve, arg, sizeof(struct agp_region)))
807 return -EFAULT;
808
809 if ((unsigned) reserve.seg_count >= ~0U/sizeof(struct agp_segment))
810 return -EFAULT;
811
812 client = agp_find_client_by_pid(reserve.pid);
813
814 if (reserve.seg_count == 0) {
815 /* remove a client */
816 client_priv = agp_find_private(reserve.pid);
817
818 if (client_priv != NULL) {
819 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
820 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
821 }
822 if (client == NULL) {
823 /* client is already removed */
824 return 0;
825 }
826 return agp_remove_client(reserve.pid);
827 } else {
828 struct agp_segment *segment;
829
830 if (reserve.seg_count >= 16384)
831 return -EINVAL;
832
833 segment = kmalloc((sizeof(struct agp_segment) * reserve.seg_count),
834 GFP_KERNEL);
835
836 if (segment == NULL)
837 return -ENOMEM;
838
839 if (copy_from_user(segment, (void __user *) reserve.seg_list,
840 sizeof(struct agp_segment) * reserve.seg_count)) {
841 kfree(segment);
842 return -EFAULT;
843 }
844 reserve.seg_list = segment;
845
846 if (client == NULL) {
847 /* Create the client and add the segment */
848 client = agp_create_client(reserve.pid);
849
850 if (client == NULL) {
851 kfree(segment);
852 return -ENOMEM;
853 }
854 client_priv = agp_find_private(reserve.pid);
855
856 if (client_priv != NULL) {
857 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
858 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
859 }
860 }
861 return agp_create_segment(client, &reserve);
862 }
863 /* Will never really happen */
864 return -EINVAL;
865}
866
867int agpioc_protect_wrap(struct agp_file_private *priv)
868{
869 DBG("");
870 /* This function is not currently implemented */
871 return -EINVAL;
872}
873
874static int agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg)
875{
876 struct agp_memory *memory;
877 struct agp_allocate alloc;
878
879 DBG("");
880 if (copy_from_user(&alloc, arg, sizeof(struct agp_allocate)))
881 return -EFAULT;
882
883 if (alloc.type >= AGP_USER_TYPES)
884 return -EINVAL;
885
886 memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);
887
888 if (memory == NULL)
889 return -ENOMEM;
890
891 alloc.key = memory->key;
892 alloc.physical = memory->physical;
893
894 if (copy_to_user(arg, &alloc, sizeof(struct agp_allocate))) {
895 agp_free_memory_wrap(memory);
896 return -EFAULT;
897 }
898 return 0;
899}
900
901int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg)
902{
903 struct agp_memory *memory;
904
905 DBG("");
906 memory = agp_find_mem_by_key(arg);
907
908 if (memory == NULL)
909 return -EINVAL;
910
911 agp_free_memory_wrap(memory);
912 return 0;
913}
914
915static int agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg)
916{
917 struct agp_bind bind_info;
918 struct agp_memory *memory;
919
920 DBG("");
921 if (copy_from_user(&bind_info, arg, sizeof(struct agp_bind)))
922 return -EFAULT;
923
924 memory = agp_find_mem_by_key(bind_info.key);
925
926 if (memory == NULL)
927 return -EINVAL;
928
929 return agp_bind_memory(memory, bind_info.pg_start);
930}
931
932static int agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg)
933{
934 struct agp_memory *memory;
935 struct agp_unbind unbind;
936
937 DBG("");
938 if (copy_from_user(&unbind, arg, sizeof(struct agp_unbind)))
939 return -EFAULT;
940
941 memory = agp_find_mem_by_key(unbind.key);
942
943 if (memory == NULL)
944 return -EINVAL;
945
946 return agp_unbind_memory(memory);
947}
948
949static long agp_ioctl(struct file *file,
950 unsigned int cmd, unsigned long arg)
951{
952 struct agp_file_private *curr_priv = file->private_data;
953 int ret_val = -ENOTTY;
954
955 DBG("priv=%p, cmd=%x", curr_priv, cmd);
956 mutex_lock(&(agp_fe.agp_mutex));
957
958 if ((agp_fe.current_controller == NULL) &&
959 (cmd != AGPIOC_ACQUIRE)) {
960 ret_val = -EINVAL;
961 goto ioctl_out;
962 }
963 if ((agp_fe.backend_acquired != true) &&
964 (cmd != AGPIOC_ACQUIRE)) {
965 ret_val = -EBUSY;
966 goto ioctl_out;
967 }
968 if (cmd != AGPIOC_ACQUIRE) {
969 if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) {
970 ret_val = -EPERM;
971 goto ioctl_out;
972 }
973 /* Use the original pid of the controller,
974 * in case it's threaded */
975
976 if (agp_fe.current_controller->pid != curr_priv->my_pid) {
977 ret_val = -EBUSY;
978 goto ioctl_out;
979 }
980 }
981
982 switch (cmd) {
983 case AGPIOC_INFO:
984 ret_val = agpioc_info_wrap(curr_priv, (void __user *) arg);
985 break;
986
987 case AGPIOC_ACQUIRE:
988 ret_val = agpioc_acquire_wrap(curr_priv);
989 break;
990
991 case AGPIOC_RELEASE:
992 ret_val = agpioc_release_wrap(curr_priv);
993 break;
994
995 case AGPIOC_SETUP:
996 ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg);
997 break;
998
999 case AGPIOC_RESERVE:
1000 ret_val = agpioc_reserve_wrap(curr_priv, (void __user *) arg);
1001 break;
1002
1003 case AGPIOC_PROTECT:
1004 ret_val = agpioc_protect_wrap(curr_priv);
1005 break;
1006
1007 case AGPIOC_ALLOCATE:
1008 ret_val = agpioc_allocate_wrap(curr_priv, (void __user *) arg);
1009 break;
1010
1011 case AGPIOC_DEALLOCATE:
1012 ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg);
1013 break;
1014
1015 case AGPIOC_BIND:
1016 ret_val = agpioc_bind_wrap(curr_priv, (void __user *) arg);
1017 break;
1018
1019 case AGPIOC_UNBIND:
1020 ret_val = agpioc_unbind_wrap(curr_priv, (void __user *) arg);
1021 break;
1022
1023 case AGPIOC_CHIPSET_FLUSH:
1024 break;
1025 }
1026
1027ioctl_out:
1028 DBG("ioctl returns %d\n", ret_val);
1029 mutex_unlock(&(agp_fe.agp_mutex));
1030 return ret_val;
1031}
1032
1033static const struct file_operations agp_fops =
1034{
1035 .owner = THIS_MODULE,
1036 .llseek = no_llseek,
1037 .unlocked_ioctl = agp_ioctl,
1038#ifdef CONFIG_COMPAT
1039 .compat_ioctl = compat_agp_ioctl,
1040#endif
1041 .mmap = agp_mmap,
1042 .open = agp_open,
1043 .release = agp_release,
1044};
1045
1046static struct miscdevice agp_miscdev =
1047{
1048 .minor = AGPGART_MINOR,
1049 .name = "agpgart",
1050 .fops = &agp_fops
1051};
1052
1053int agp_frontend_initialize(void)
1054{
1055 memset(&agp_fe, 0, sizeof(struct agp_front_data));
1056 mutex_init(&(agp_fe.agp_mutex));
1057
1058 if (misc_register(&agp_miscdev)) {
1059 printk(KERN_ERR PFX "unable to get minor: %d\n", AGPGART_MINOR);
1060 return -EIO;
1061 }
1062 return 0;
1063}
1064
1065void agp_frontend_cleanup(void)
1066{
1067 misc_deregister(&agp_miscdev);
1068}