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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/init.h>
35#include <linux/miscdevice.h>
36#include <linux/agp_backend.h>
37#include <linux/agpgart.h>
38#include <linux/slab.h>
39#include <linux/mm.h>
40#include <linux/fs.h>
41#include <linux/sched.h>
42#include <asm/uaccess.h>
43#include <asm/pgtable.h>
44#include "agp.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 num_segments, 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 num_segments = client->num_segments;
114
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))) {
119 return seg + i;
120 }
121 }
122
123 return NULL;
124}
125
126static void agp_remove_seg_from_client(struct agp_client *client)
127{
128 DBG("client=%p", client);
129
130 if (client->segments != NULL) {
131 if (*(client->segments) != NULL) {
132 DBG("Freeing %p from client %p", *(client->segments), client);
133 kfree(*(client->segments));
134 }
135 DBG("Freeing %p from client %p", client->segments, client);
136 kfree(client->segments);
137 client->segments = NULL;
138 }
139}
140
141static void agp_add_seg_to_client(struct agp_client *client,
142 struct agp_segment_priv ** seg, int num_segments)
143{
144 struct agp_segment_priv **prev_seg;
145
146 prev_seg = client->segments;
147
148 if (prev_seg != NULL)
149 agp_remove_seg_from_client(client);
150
151 DBG("Adding seg %p (%d segments) to client %p", seg, num_segments, client);
152 client->num_segments = num_segments;
153 client->segments = seg;
154}
155
156static pgprot_t agp_convert_mmap_flags(int prot)
157{
158 unsigned long prot_bits;
159
160 prot_bits = calc_vm_prot_bits(prot) | VM_SHARED;
161 return vm_get_page_prot(prot_bits);
162}
163
164int agp_create_segment(struct agp_client *client, struct agp_region *region)
165{
166 struct agp_segment_priv **ret_seg;
167 struct agp_segment_priv *seg;
168 struct agp_segment *user_seg;
169 size_t i;
170
171 seg = kzalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL);
172 if (seg == NULL) {
173 kfree(region->seg_list);
174 region->seg_list = NULL;
175 return -ENOMEM;
176 }
177 user_seg = region->seg_list;
178
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);
183 }
184 kfree(region->seg_list);
185 region->seg_list = NULL;
186
187 ret_seg = kmalloc(sizeof(void *), GFP_KERNEL);
188 if (ret_seg == NULL) {
189 kfree(seg);
190 return -ENOMEM;
191 }
192 *ret_seg = seg;
193 agp_add_seg_to_client(client, ret_seg, region->seg_count);
194 return 0;
195}
196
197/* End - Routines for managing each client's segment list */
198
199/* This function must only be called when current_controller != NULL */
200static void agp_insert_into_pool(struct agp_memory * temp)
201{
202 struct agp_memory *prev;
203
204 prev = agp_fe.current_controller->pool;
205
206 if (prev != NULL) {
207 prev->prev = temp;
208 temp->next = prev;
209 }
210 agp_fe.current_controller->pool = temp;
211}
212
213
214/* File private list routines */
215
216struct agp_file_private *agp_find_private(pid_t pid)
217{
218 struct agp_file_private *curr;
219
220 curr = agp_fe.file_priv_list;
221
222 while (curr != NULL) {
223 if (curr->my_pid == pid)
224 return curr;
225 curr = curr->next;
226 }
227
228 return NULL;
229}
230
231static void agp_insert_file_private(struct agp_file_private * priv)
232{
233 struct agp_file_private *prev;
234
235 prev = agp_fe.file_priv_list;
236
237 if (prev != NULL)
238 prev->prev = priv;
239 priv->next = prev;
240 agp_fe.file_priv_list = priv;
241}
242
243static void agp_remove_file_private(struct agp_file_private * priv)
244{
245 struct agp_file_private *next;
246 struct agp_file_private *prev;
247
248 next = priv->next;
249 prev = priv->prev;
250
251 if (prev != NULL) {
252 prev->next = next;
253
254 if (next != NULL)
255 next->prev = prev;
256
257 } else {
258 if (next != NULL)
259 next->prev = NULL;
260
261 agp_fe.file_priv_list = next;
262 }
263}
264
265/* End - File flag list routines */
266
267/*
268 * Wrappers for agp_free_memory & agp_allocate_memory
269 * These make sure that internal lists are kept updated.
270 */
271void agp_free_memory_wrap(struct agp_memory *memory)
272{
273 agp_remove_from_pool(memory);
274 agp_free_memory(memory);
275}
276
277struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type)
278{
279 struct agp_memory *memory;
280
281 memory = agp_allocate_memory(agp_bridge, pg_count, type);
282 if (memory == NULL)
283 return NULL;
284
285 agp_insert_into_pool(memory);
286 return memory;
287}
288
289/* Routines for managing the list of controllers -
290 * These routines manage the current controller, and the list of
291 * controllers
292 */
293
294static struct agp_controller *agp_find_controller_by_pid(pid_t id)
295{
296 struct agp_controller *controller;
297
298 controller = agp_fe.controllers;
299
300 while (controller != NULL) {
301 if (controller->pid == id)
302 return controller;
303 controller = controller->next;
304 }
305
306 return NULL;
307}
308
309static struct agp_controller *agp_create_controller(pid_t id)
310{
311 struct agp_controller *controller;
312
313 controller = kzalloc(sizeof(struct agp_controller), GFP_KERNEL);
314 if (controller == NULL)
315 return NULL;
316
317 controller->pid = id;
318 return controller;
319}
320
321static int agp_insert_controller(struct agp_controller *controller)
322{
323 struct agp_controller *prev_controller;
324
325 prev_controller = agp_fe.controllers;
326 controller->next = prev_controller;
327
328 if (prev_controller != NULL)
329 prev_controller->prev = controller;
330
331 agp_fe.controllers = controller;
332
333 return 0;
334}
335
336static void agp_remove_all_clients(struct agp_controller *controller)
337{
338 struct agp_client *client;
339 struct agp_client *temp;
340
341 client = controller->clients;
342
343 while (client) {
344 struct agp_file_private *priv;
345
346 temp = client;
347 agp_remove_seg_from_client(temp);
348 priv = agp_find_private(temp->pid);
349
350 if (priv != NULL) {
351 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
352 clear_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
353 }
354 client = client->next;
355 kfree(temp);
356 }
357}
358
359static void agp_remove_all_memory(struct agp_controller *controller)
360{
361 struct agp_memory *memory;
362 struct agp_memory *temp;
363
364 memory = controller->pool;
365
366 while (memory) {
367 temp = memory;
368 memory = memory->next;
369 agp_free_memory_wrap(temp);
370 }
371}
372
373static int agp_remove_controller(struct agp_controller *controller)
374{
375 struct agp_controller *prev_controller;
376 struct agp_controller *next_controller;
377
378 prev_controller = controller->prev;
379 next_controller = controller->next;
380
381 if (prev_controller != NULL) {
382 prev_controller->next = next_controller;
383 if (next_controller != NULL)
384 next_controller->prev = prev_controller;
385
386 } else {
387 if (next_controller != NULL)
388 next_controller->prev = NULL;
389
390 agp_fe.controllers = next_controller;
391 }
392
393 agp_remove_all_memory(controller);
394 agp_remove_all_clients(controller);
395
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);
400 }
401 kfree(controller);
402 return 0;
403}
404
405static void agp_controller_make_current(struct agp_controller *controller)
406{
407 struct agp_client *clients;
408
409 clients = controller->clients;
410
411 while (clients != NULL) {
412 struct agp_file_private *priv;
413
414 priv = agp_find_private(clients->pid);
415
416 if (priv != NULL) {
417 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
418 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
419 }
420 clients = clients->next;
421 }
422
423 agp_fe.current_controller = controller;
424}
425
426static void agp_controller_release_current(struct agp_controller *controller,
427 struct agp_file_private *controller_priv)
428{
429 struct agp_client *clients;
430
431 clear_bit(AGP_FF_IS_VALID, &controller_priv->access_flags);
432 clients = controller->clients;
433
434 while (clients != NULL) {
435 struct agp_file_private *priv;
436
437 priv = agp_find_private(clients->pid);
438
439 if (priv != NULL)
440 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
441
442 clients = clients->next;
443 }
444
445 agp_fe.current_controller = NULL;
446 agp_fe.used_by_controller = false;
447 agp_backend_release(agp_bridge);
448}
449
450/*
451 * Routines for managing client lists -
452 * These routines are for managing the list of auth'ed clients.
453 */
454
455static struct agp_client
456*agp_find_client_in_controller(struct agp_controller *controller, pid_t id)
457{
458 struct agp_client *client;
459
460 if (controller == NULL)
461 return NULL;
462
463 client = controller->clients;
464
465 while (client != NULL) {
466 if (client->pid == id)
467 return client;
468 client = client->next;
469 }
470
471 return NULL;
472}
473
474static struct agp_controller *agp_find_controller_for_client(pid_t id)
475{
476 struct agp_controller *controller;
477
478 controller = agp_fe.controllers;
479
480 while (controller != NULL) {
481 if ((agp_find_client_in_controller(controller, id)) != NULL)
482 return controller;
483 controller = controller->next;
484 }
485
486 return NULL;
487}
488
489struct agp_client *agp_find_client_by_pid(pid_t id)
490{
491 struct agp_client *temp;
492
493 if (agp_fe.current_controller == NULL)
494 return NULL;
495
496 temp = agp_find_client_in_controller(agp_fe.current_controller, id);
497 return temp;
498}
499
500static void agp_insert_client(struct agp_client *client)
501{
502 struct agp_client *prev_client;
503
504 prev_client = agp_fe.current_controller->clients;
505 client->next = prev_client;
506
507 if (prev_client != NULL)
508 prev_client->prev = client;
509
510 agp_fe.current_controller->clients = client;
511 agp_fe.current_controller->num_clients++;
512}
513
514struct agp_client *agp_create_client(pid_t id)
515{
516 struct agp_client *new_client;
517
518 new_client = kzalloc(sizeof(struct agp_client), GFP_KERNEL);
519 if (new_client == NULL)
520 return NULL;
521
522 new_client->pid = id;
523 agp_insert_client(new_client);
524 return new_client;
525}
526
527int agp_remove_client(pid_t id)
528{
529 struct agp_client *client;
530 struct agp_client *prev_client;
531 struct agp_client *next_client;
532 struct agp_controller *controller;
533
534 controller = agp_find_controller_for_client(id);
535 if (controller == NULL)
536 return -EINVAL;
537
538 client = agp_find_client_in_controller(controller, id);
539 if (client == NULL)
540 return -EINVAL;
541
542 prev_client = client->prev;
543 next_client = client->next;
544
545 if (prev_client != NULL) {
546 prev_client->next = next_client;
547 if (next_client != NULL)
548 next_client->prev = prev_client;
549
550 } else {
551 if (next_client != NULL)
552 next_client->prev = NULL;
553 controller->clients = next_client;
554 }
555
556 controller->num_clients--;
557 agp_remove_seg_from_client(client);
558 kfree(client);
559 return 0;
560}
561
562/* End - Routines for managing client lists */
563
564/* File Operations */
565
566static int agp_mmap(struct file *file, struct vm_area_struct *vma)
567{
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;
573
574 mutex_lock(&(agp_fe.agp_mutex));
575
576 if (agp_fe.backend_acquired != true)
577 goto out_eperm;
578
579 if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags)))
580 goto out_eperm;
581
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);
588
589 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) {
590 if ((size + offset) > current_size)
591 goto out_inval;
592
593 client = agp_find_client_by_pid(current->pid);
594
595 if (client == NULL)
596 goto out_eperm;
597
598 if (!agp_find_seg_in_client(client, offset, size, vma->vm_page_prot))
599 goto out_inval;
600
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)) {
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, vma->vm_page_prot)) {
623 goto out_again;
624 }
625 mutex_unlock(&(agp_fe.agp_mutex));
626 return 0;
627 }
628
629out_eperm:
630 mutex_unlock(&(agp_fe.agp_mutex));
631 return -EPERM;
632
633out_inval:
634 mutex_unlock(&(agp_fe.agp_mutex));
635 return -EINVAL;
636
637out_again:
638 mutex_unlock(&(agp_fe.agp_mutex));
639 return -EAGAIN;
640}
641
642static int agp_release(struct inode *inode, struct file *file)
643{
644 struct agp_file_private *priv = file->private_data;
645
646 mutex_lock(&(agp_fe.agp_mutex));
647
648 DBG("priv=%p", priv);
649
650 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
651 struct agp_controller *controller;
652
653 controller = agp_find_controller_by_pid(priv->my_pid);
654
655 if (controller != NULL) {
656 if (controller == agp_fe.current_controller)
657 agp_controller_release_current(controller, priv);
658 agp_remove_controller(controller);
659 controller = NULL;
660 }
661 }
662
663 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags))
664 agp_remove_client(priv->my_pid);
665
666 agp_remove_file_private(priv);
667 kfree(priv);
668 file->private_data = NULL;
669 mutex_unlock(&(agp_fe.agp_mutex));
670 return 0;
671}
672
673static int agp_open(struct inode *inode, struct file *file)
674{
675 int minor = iminor(inode);
676 struct agp_file_private *priv;
677 struct agp_client *client;
678
679 if (minor != AGPGART_MINOR)
680 return -ENXIO;
681
682 mutex_lock(&(agp_fe.agp_mutex));
683
684 priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL);
685 if (priv == NULL) {
686 mutex_unlock(&(agp_fe.agp_mutex));
687 return -ENOMEM;
688 }
689
690 set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags);
691 priv->my_pid = current->pid;
692
693 if (capable(CAP_SYS_RAWIO))
694 /* Root priv, can be controller */
695 set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags);
696
697 client = agp_find_client_by_pid(current->pid);
698
699 if (client != NULL) {
700 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
701 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
702 }
703 file->private_data = (void *) priv;
704 agp_insert_file_private(priv);
705 DBG("private=%p, client=%p", priv, client);
706
707 mutex_unlock(&(agp_fe.agp_mutex));
708
709 return 0;
710}
711
712
713static ssize_t agp_read(struct file *file, char __user *buf,
714 size_t count, loff_t * ppos)
715{
716 return -EINVAL;
717}
718
719static ssize_t agp_write(struct file *file, const char __user *buf,
720 size_t count, loff_t * ppos)
721{
722 return -EINVAL;
723}
724
725static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
726{
727 struct agp_info userinfo;
728 struct agp_kern_info kerninfo;
729
730 agp_copy_info(agp_bridge, &kerninfo);
731
732 userinfo.version.major = kerninfo.version.major;
733 userinfo.version.minor = kerninfo.version.minor;
734 userinfo.bridge_id = kerninfo.device->vendor |
735 (kerninfo.device->device << 16);
736 userinfo.agp_mode = kerninfo.mode;
737 userinfo.aper_base = kerninfo.aper_base;
738 userinfo.aper_size = kerninfo.aper_size;
739 userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory;
740 userinfo.pg_used = kerninfo.current_memory;
741
742 if (copy_to_user(arg, &userinfo, sizeof(struct agp_info)))
743 return -EFAULT;
744
745 return 0;
746}
747
748int agpioc_acquire_wrap(struct agp_file_private *priv)
749{
750 struct agp_controller *controller;
751
752 DBG("");
753
754 if (!(test_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags)))
755 return -EPERM;
756
757 if (agp_fe.current_controller != NULL)
758 return -EBUSY;
759
760 if (!agp_bridge)
761 return -ENODEV;
762
763 if (atomic_read(&agp_bridge->agp_in_use))
764 return -EBUSY;
765
766 atomic_inc(&agp_bridge->agp_in_use);
767
768 agp_fe.backend_acquired = true;
769
770 controller = agp_find_controller_by_pid(priv->my_pid);
771
772 if (controller != NULL) {
773 agp_controller_make_current(controller);
774 } else {
775 controller = agp_create_controller(priv->my_pid);
776
777 if (controller == NULL) {
778 agp_fe.backend_acquired = false;
779 agp_backend_release(agp_bridge);
780 return -ENOMEM;
781 }
782 agp_insert_controller(controller);
783 agp_controller_make_current(controller);
784 }
785
786 set_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags);
787 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
788 return 0;
789}
790
791int agpioc_release_wrap(struct agp_file_private *priv)
792{
793 DBG("");
794 agp_controller_release_current(agp_fe.current_controller, priv);
795 return 0;
796}
797
798int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg)
799{
800 struct agp_setup mode;
801
802 DBG("");
803 if (copy_from_user(&mode, arg, sizeof(struct agp_setup)))
804 return -EFAULT;
805
806 agp_enable(agp_bridge, mode.agp_mode);
807 return 0;
808}
809
810static int agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg)
811{
812 struct agp_region reserve;
813 struct agp_client *client;
814 struct agp_file_private *client_priv;
815
816 DBG("");
817 if (copy_from_user(&reserve, arg, sizeof(struct agp_region)))
818 return -EFAULT;
819
820 if ((unsigned) reserve.seg_count >= ~0U/sizeof(struct agp_segment))
821 return -EFAULT;
822
823 client = agp_find_client_by_pid(reserve.pid);
824
825 if (reserve.seg_count == 0) {
826 /* remove a client */
827 client_priv = agp_find_private(reserve.pid);
828
829 if (client_priv != NULL) {
830 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
831 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
832 }
833 if (client == NULL) {
834 /* client is already removed */
835 return 0;
836 }
837 return agp_remove_client(reserve.pid);
838 } else {
839 struct agp_segment *segment;
840
841 if (reserve.seg_count >= 16384)
842 return -EINVAL;
843
844 segment = kmalloc((sizeof(struct agp_segment) * reserve.seg_count),
845 GFP_KERNEL);
846
847 if (segment == NULL)
848 return -ENOMEM;
849
850 if (copy_from_user(segment, (void __user *) reserve.seg_list,
851 sizeof(struct agp_segment) * reserve.seg_count)) {
852 kfree(segment);
853 return -EFAULT;
854 }
855 reserve.seg_list = segment;
856
857 if (client == NULL) {
858 /* Create the client and add the segment */
859 client = agp_create_client(reserve.pid);
860
861 if (client == NULL) {
862 kfree(segment);
863 return -ENOMEM;
864 }
865 client_priv = agp_find_private(reserve.pid);
866
867 if (client_priv != NULL) {
868 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
869 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
870 }
871 }
872 return agp_create_segment(client, &reserve);
873 }
874 /* Will never really happen */
875 return -EINVAL;
876}
877
878int agpioc_protect_wrap(struct agp_file_private *priv)
879{
880 DBG("");
881 /* This function is not currently implemented */
882 return -EINVAL;
883}
884
885static int agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg)
886{
887 struct agp_memory *memory;
888 struct agp_allocate alloc;
889
890 DBG("");
891 if (copy_from_user(&alloc, arg, sizeof(struct agp_allocate)))
892 return -EFAULT;
893
894 if (alloc.type >= AGP_USER_TYPES)
895 return -EINVAL;
896
897 memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);
898
899 if (memory == NULL)
900 return -ENOMEM;
901
902 alloc.key = memory->key;
903 alloc.physical = memory->physical;
904
905 if (copy_to_user(arg, &alloc, sizeof(struct agp_allocate))) {
906 agp_free_memory_wrap(memory);
907 return -EFAULT;
908 }
909 return 0;
910}
911
912int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg)
913{
914 struct agp_memory *memory;
915
916 DBG("");
917 memory = agp_find_mem_by_key(arg);
918
919 if (memory == NULL)
920 return -EINVAL;
921
922 agp_free_memory_wrap(memory);
923 return 0;
924}
925
926static int agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg)
927{
928 struct agp_bind bind_info;
929 struct agp_memory *memory;
930
931 DBG("");
932 if (copy_from_user(&bind_info, arg, sizeof(struct agp_bind)))
933 return -EFAULT;
934
935 memory = agp_find_mem_by_key(bind_info.key);
936
937 if (memory == NULL)
938 return -EINVAL;
939
940 return agp_bind_memory(memory, bind_info.pg_start);
941}
942
943static int agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg)
944{
945 struct agp_memory *memory;
946 struct agp_unbind unbind;
947
948 DBG("");
949 if (copy_from_user(&unbind, arg, sizeof(struct agp_unbind)))
950 return -EFAULT;
951
952 memory = agp_find_mem_by_key(unbind.key);
953
954 if (memory == NULL)
955 return -EINVAL;
956
957 return agp_unbind_memory(memory);
958}
959
960static long agp_ioctl(struct file *file,
961 unsigned int cmd, unsigned long arg)
962{
963 struct agp_file_private *curr_priv = file->private_data;
964 int ret_val = -ENOTTY;
965
966 DBG("priv=%p, cmd=%x", curr_priv, cmd);
967 mutex_lock(&(agp_fe.agp_mutex));
968
969 if ((agp_fe.current_controller == NULL) &&
970 (cmd != AGPIOC_ACQUIRE)) {
971 ret_val = -EINVAL;
972 goto ioctl_out;
973 }
974 if ((agp_fe.backend_acquired != true) &&
975 (cmd != AGPIOC_ACQUIRE)) {
976 ret_val = -EBUSY;
977 goto ioctl_out;
978 }
979 if (cmd != AGPIOC_ACQUIRE) {
980 if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) {
981 ret_val = -EPERM;
982 goto ioctl_out;
983 }
984 /* Use the original pid of the controller,
985 * in case it's threaded */
986
987 if (agp_fe.current_controller->pid != curr_priv->my_pid) {
988 ret_val = -EBUSY;
989 goto ioctl_out;
990 }
991 }
992
993 switch (cmd) {
994 case AGPIOC_INFO:
995 ret_val = agpioc_info_wrap(curr_priv, (void __user *) arg);
996 break;
997
998 case AGPIOC_ACQUIRE:
999 ret_val = agpioc_acquire_wrap(curr_priv);
1000 break;
1001
1002 case AGPIOC_RELEASE:
1003 ret_val = agpioc_release_wrap(curr_priv);
1004 break;
1005
1006 case AGPIOC_SETUP:
1007 ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg);
1008 break;
1009
1010 case AGPIOC_RESERVE:
1011 ret_val = agpioc_reserve_wrap(curr_priv, (void __user *) arg);
1012 break;
1013
1014 case AGPIOC_PROTECT:
1015 ret_val = agpioc_protect_wrap(curr_priv);
1016 break;
1017
1018 case AGPIOC_ALLOCATE:
1019 ret_val = agpioc_allocate_wrap(curr_priv, (void __user *) arg);
1020 break;
1021
1022 case AGPIOC_DEALLOCATE:
1023 ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg);
1024 break;
1025
1026 case AGPIOC_BIND:
1027 ret_val = agpioc_bind_wrap(curr_priv, (void __user *) arg);
1028 break;
1029
1030 case AGPIOC_UNBIND:
1031 ret_val = agpioc_unbind_wrap(curr_priv, (void __user *) arg);
1032 break;
1033
1034 case AGPIOC_CHIPSET_FLUSH:
1035 break;
1036 }
1037
1038ioctl_out:
1039 DBG("ioctl returns %d\n", ret_val);
1040 mutex_unlock(&(agp_fe.agp_mutex));
1041 return ret_val;
1042}
1043
1044static const struct file_operations agp_fops =
1045{
1046 .owner = THIS_MODULE,
1047 .llseek = no_llseek,
1048 .read = agp_read,
1049 .write = agp_write,
1050 .unlocked_ioctl = agp_ioctl,
1051#ifdef CONFIG_COMPAT
1052 .compat_ioctl = compat_agp_ioctl,
1053#endif
1054 .mmap = agp_mmap,
1055 .open = agp_open,
1056 .release = agp_release,
1057};
1058
1059static struct miscdevice agp_miscdev =
1060{
1061 .minor = AGPGART_MINOR,
1062 .name = "agpgart",
1063 .fops = &agp_fops
1064};
1065
1066int agp_frontend_initialize(void)
1067{
1068 memset(&agp_fe, 0, sizeof(struct agp_front_data));
1069 mutex_init(&(agp_fe.agp_mutex));
1070
1071 if (misc_register(&agp_miscdev)) {
1072 printk(KERN_ERR PFX "unable to get minor: %d\n", AGPGART_MINOR);
1073 return -EIO;
1074 }
1075 return 0;
1076}
1077
1078void agp_frontend_cleanup(void)
1079{
1080 misc_deregister(&agp_miscdev);
1081}