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[AGPGART] remove private page protection map
[net-next-2.6.git] / drivers / char / agp / frontend.c
CommitLineData
1da177e4
LT		 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 <asm/uaccess.h>
41#include <asm/pgtable.h>
42#include "agp.h"
43
44static struct agp_front_data agp_fe;
45
46static struct agp_memory *agp_find_mem_by_key(int key)
47{
48 struct agp_memory *curr;
49
50 if (agp_fe.current_controller == NULL)
51 return NULL;
52
53 curr = agp_fe.current_controller->pool;
54
55 while (curr != NULL) {
56 if (curr->key == key)
57 break;
58 curr = curr->next;
59 }
60
61 DBG("key=%d -> mem=%p", key, curr);
62 return curr;
63}
64
65static void agp_remove_from_pool(struct agp_memory *temp)
66{
67 struct agp_memory *prev;
68 struct agp_memory *next;
69
70 /* Check to see if this is even in the memory pool */
71
72 DBG("mem=%p", temp);
73 if (agp_find_mem_by_key(temp->key) != NULL) {
74 next = temp->next;
75 prev = temp->prev;
76
77 if (prev != NULL) {
78 prev->next = next;
79 if (next != NULL)
80 next->prev = prev;
81
82 } else {
83 /* This is the first item on the list */
84 if (next != NULL)
85 next->prev = NULL;
86
87 agp_fe.current_controller->pool = next;
88 }
89 }
90}
91
92/*
93 * Routines for managing each client's segment list -
94 * These routines handle adding and removing segments
95 * to each auth'ed client.
96 */
97
98static struct
99agp_segment_priv *agp_find_seg_in_client(const struct agp_client *client,
100 unsigned long offset,
101 int size, pgprot_t page_prot)
102{
103 struct agp_segment_priv *seg;
104 int num_segments, i;
105 off_t pg_start;
106 size_t pg_count;
107
108 pg_start = offset / 4096;
109 pg_count = size / 4096;
110 seg = *(client->segments);
111 num_segments = client->num_segments;
112
113 for (i = 0; i < client->num_segments; i++) {
114 if ((seg[i].pg_start == pg_start) &&
115 (seg[i].pg_count == pg_count) &&
116 (pgprot_val(seg[i].prot) == pgprot_val(page_prot))) {
117 return seg + i;
118 }
119 }
120
121 return NULL;
122}
123
124static void agp_remove_seg_from_client(struct agp_client *client)
125{
126 DBG("client=%p", client);
127
128 if (client->segments != NULL) {
129 if (*(client->segments) != NULL) {
130 DBG("Freeing %p from client %p", *(client->segments), client);
131 kfree(*(client->segments));
132 }
133 DBG("Freeing %p from client %p", client->segments, client);
134 kfree(client->segments);
135 client->segments = NULL;
136 }
137}
138
139static void agp_add_seg_to_client(struct agp_client *client,
140 struct agp_segment_priv ** seg, int num_segments)
141{
142 struct agp_segment_priv **prev_seg;
143
144 prev_seg = client->segments;
145
146 if (prev_seg != NULL)
147 agp_remove_seg_from_client(client);
148
149 DBG("Adding seg %p (%d segments) to client %p", seg, num_segments, client);
150 client->num_segments = num_segments;
151 client->segments = seg;
152}
153
1da177e4
LT		 154static pgprot_t agp_convert_mmap_flags(int prot)
155{
1da177e4 156 unsigned long prot_bits;
1da177e4 157
804af2cf
HD		 158 prot_bits = calc_vm_prot_bits(prot) | VM_SHARED;
159 return vm_get_page_prot(prot_bits);
1da177e4
LT		 160}
161
162static int agp_create_segment(struct agp_client *client, struct agp_region *region)
163{
164 struct agp_segment_priv **ret_seg;
165 struct agp_segment_priv *seg;
166 struct agp_segment *user_seg;
167 size_t i;
168
0ea27d9f 169 seg = kzalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL);
1da177e4
LT		 170 if (seg == NULL) {
171 kfree(region->seg_list);
172 region->seg_list = NULL;
173 return -ENOMEM;
174 }
1da177e4
LT		 175 user_seg = region->seg_list;
176
177 for (i = 0; i < region->seg_count; i++) {
178 seg[i].pg_start = user_seg[i].pg_start;
179 seg[i].pg_count = user_seg[i].pg_count;
180 seg[i].prot = agp_convert_mmap_flags(user_seg[i].prot);
181 }
182 kfree(region->seg_list);
183 region->seg_list = NULL;
184
185 ret_seg = kmalloc(sizeof(void *), GFP_KERNEL);
186 if (ret_seg == NULL) {
187 kfree(seg);
188 return -ENOMEM;
189 }
190 *ret_seg = seg;
191 agp_add_seg_to_client(client, ret_seg, region->seg_count);
192 return 0;
193}
194
195/* End - Routines for managing each client's segment list */
196
197/* This function must only be called when current_controller != NULL */
198static void agp_insert_into_pool(struct agp_memory * temp)
199{
200 struct agp_memory *prev;
201
202 prev = agp_fe.current_controller->pool;
203
204 if (prev != NULL) {
205 prev->prev = temp;
206 temp->next = prev;
207 }
208 agp_fe.current_controller->pool = temp;
209}
210
211
212/* File private list routines */
213
408b664a 214static struct agp_file_private *agp_find_private(pid_t pid)
1da177e4
LT		 215{
216 struct agp_file_private *curr;
217
218 curr = agp_fe.file_priv_list;
219
220 while (curr != NULL) {
221 if (curr->my_pid == pid)
222 return curr;
223 curr = curr->next;
224 }
225
226 return NULL;
227}
228
408b664a 229static void agp_insert_file_private(struct agp_file_private * priv)
1da177e4
LT		 230{
231 struct agp_file_private *prev;
232
233 prev = agp_fe.file_priv_list;
234
235 if (prev != NULL)
236 prev->prev = priv;
237 priv->next = prev;
238 agp_fe.file_priv_list = priv;
239}
240
408b664a 241static void agp_remove_file_private(struct agp_file_private * priv)
1da177e4
LT		 242{
243 struct agp_file_private *next;
244 struct agp_file_private *prev;
245
246 next = priv->next;
247 prev = priv->prev;
248
249 if (prev != NULL) {
250 prev->next = next;
251
252 if (next != NULL)
253 next->prev = prev;
254
255 } else {
256 if (next != NULL)
257 next->prev = NULL;
258
259 agp_fe.file_priv_list = next;
260 }
261}
262
263/* End - File flag list routines */
264
265/*
266 * Wrappers for agp_free_memory & agp_allocate_memory
267 * These make sure that internal lists are kept updated.
268 */
269static void agp_free_memory_wrap(struct agp_memory *memory)
270{
271 agp_remove_from_pool(memory);
272 agp_free_memory(memory);
273}
274
275static struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type)
276{
277 struct agp_memory *memory;
278
279 memory = agp_allocate_memory(agp_bridge, pg_count, type);
280 if (memory == NULL)
281 return NULL;
282
283 agp_insert_into_pool(memory);
284 return memory;
285}
286
287/* Routines for managing the list of controllers -
288 * These routines manage the current controller, and the list of
289 * controllers
290 */
291
292static struct agp_controller *agp_find_controller_by_pid(pid_t id)
293{
294 struct agp_controller *controller;
295
296 controller = agp_fe.controllers;
297
298 while (controller != NULL) {
299 if (controller->pid == id)
300 return controller;
301 controller = controller->next;
302 }
303
304 return NULL;
305}
306
307static struct agp_controller *agp_create_controller(pid_t id)
308{
309 struct agp_controller *controller;
310
0ea27d9f 311 controller = kzalloc(sizeof(struct agp_controller), GFP_KERNEL);
1da177e4
LT		 312 if (controller == NULL)
313 return NULL;
314
1da177e4 315 controller->pid = id;
1da177e4
LT		 316 return controller;
317}
318
319static int agp_insert_controller(struct agp_controller *controller)
320{
321 struct agp_controller *prev_controller;
322
323 prev_controller = agp_fe.controllers;
324 controller->next = prev_controller;
325
326 if (prev_controller != NULL)
327 prev_controller->prev = controller;
328
329 agp_fe.controllers = controller;
330
331 return 0;
332}
333
334static void agp_remove_all_clients(struct agp_controller *controller)
335{
336 struct agp_client *client;
337 struct agp_client *temp;
338
339 client = controller->clients;
340
341 while (client) {
342 struct agp_file_private *priv;
343
344 temp = client;
345 agp_remove_seg_from_client(temp);
346 priv = agp_find_private(temp->pid);
347
348 if (priv != NULL) {
349 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
350 clear_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
351 }
352 client = client->next;
353 kfree(temp);
354 }
355}
356
357static void agp_remove_all_memory(struct agp_controller *controller)
358{
359 struct agp_memory *memory;
360 struct agp_memory *temp;
361
362 memory = controller->pool;
363
364 while (memory) {
365 temp = memory;
366 memory = memory->next;
367 agp_free_memory_wrap(temp);
368 }
369}
370
371static int agp_remove_controller(struct agp_controller *controller)
372{
373 struct agp_controller *prev_controller;
374 struct agp_controller *next_controller;
375
376 prev_controller = controller->prev;
377 next_controller = controller->next;
378
379 if (prev_controller != NULL) {
380 prev_controller->next = next_controller;
381 if (next_controller != NULL)
382 next_controller->prev = prev_controller;
383
384 } else {
385 if (next_controller != NULL)
386 next_controller->prev = NULL;
387
388 agp_fe.controllers = next_controller;
389 }
390
391 agp_remove_all_memory(controller);
392 agp_remove_all_clients(controller);
393
394 if (agp_fe.current_controller == controller) {
395 agp_fe.current_controller = NULL;
396 agp_fe.backend_acquired = FALSE;
397 agp_backend_release(agp_bridge);
398 }
399 kfree(controller);
400 return 0;
401}
402
403static void agp_controller_make_current(struct agp_controller *controller)
404{
405 struct agp_client *clients;
406
407 clients = controller->clients;
408
409 while (clients != NULL) {
410 struct agp_file_private *priv;
411
412 priv = agp_find_private(clients->pid);
413
414 if (priv != NULL) {
415 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
416 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
417 }
418 clients = clients->next;
419 }
420
421 agp_fe.current_controller = controller;
422}
423
424static void agp_controller_release_current(struct agp_controller *controller,
425 struct agp_file_private *controller_priv)
426{
427 struct agp_client *clients;
428
429 clear_bit(AGP_FF_IS_VALID, &controller_priv->access_flags);
430 clients = controller->clients;
431
432 while (clients != NULL) {
433 struct agp_file_private *priv;
434
435 priv = agp_find_private(clients->pid);
436
437 if (priv != NULL)
438 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
439
440 clients = clients->next;
441 }
442
443 agp_fe.current_controller = NULL;
444 agp_fe.used_by_controller = FALSE;
445 agp_backend_release(agp_bridge);
446}
447
448/*
449 * Routines for managing client lists -
450 * These routines are for managing the list of auth'ed clients.
451 */
452
453static struct agp_client
454*agp_find_client_in_controller(struct agp_controller *controller, pid_t id)
455{
456 struct agp_client *client;
457
458 if (controller == NULL)
459 return NULL;
460
461 client = controller->clients;
462
463 while (client != NULL) {
464 if (client->pid == id)
465 return client;
466 client = client->next;
467 }
468
469 return NULL;
470}
471
472static struct agp_controller *agp_find_controller_for_client(pid_t id)
473{
474 struct agp_controller *controller;
475
476 controller = agp_fe.controllers;
477
478 while (controller != NULL) {
479 if ((agp_find_client_in_controller(controller, id)) != NULL)
480 return controller;
481 controller = controller->next;
482 }
483
484 return NULL;
485}
486
487static struct agp_client *agp_find_client_by_pid(pid_t id)
488{
489 struct agp_client *temp;
490
491 if (agp_fe.current_controller == NULL)
492 return NULL;
493
494 temp = agp_find_client_in_controller(agp_fe.current_controller, id);
495 return temp;
496}
497
498static void agp_insert_client(struct agp_client *client)
499{
500 struct agp_client *prev_client;
501
502 prev_client = agp_fe.current_controller->clients;
503 client->next = prev_client;
504
505 if (prev_client != NULL)
506 prev_client->prev = client;
507
508 agp_fe.current_controller->clients = client;
509 agp_fe.current_controller->num_clients++;
510}
511
512static struct agp_client *agp_create_client(pid_t id)
513{
514 struct agp_client *new_client;
515
0ea27d9f 516 new_client = kzalloc(sizeof(struct agp_client), GFP_KERNEL);
1da177e4
LT		 517 if (new_client == NULL)
518 return NULL;
519
1da177e4
LT		 520 new_client->pid = id;
521 agp_insert_client(new_client);
522 return new_client;
523}
524
525static int agp_remove_client(pid_t id)
526{
527 struct agp_client *client;
528 struct agp_client *prev_client;
529 struct agp_client *next_client;
530 struct agp_controller *controller;
531
532 controller = agp_find_controller_for_client(id);
533 if (controller == NULL)
534 return -EINVAL;
535
536 client = agp_find_client_in_controller(controller, id);
537 if (client == NULL)
538 return -EINVAL;
539
540 prev_client = client->prev;
541 next_client = client->next;
542
543 if (prev_client != NULL) {
544 prev_client->next = next_client;
545 if (next_client != NULL)
546 next_client->prev = prev_client;
547
548 } else {
549 if (next_client != NULL)
550 next_client->prev = NULL;
551 controller->clients = next_client;
552 }
553
554 controller->num_clients--;
555 agp_remove_seg_from_client(client);
556 kfree(client);
557 return 0;
558}
559
560/* End - Routines for managing client lists */
561
562/* File Operations */
563
564static int agp_mmap(struct file *file, struct vm_area_struct *vma)
565{
566 unsigned int size, current_size;
567 unsigned long offset;
568 struct agp_client *client;
569 struct agp_file_private *priv = file->private_data;
570 struct agp_kern_info kerninfo;
571
16867823 572 mutex_lock(&(agp_fe.agp_mutex));
1da177e4
LT		 573
574 if (agp_fe.backend_acquired != TRUE)
575 goto out_eperm;
576
577 if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags)))
578 goto out_eperm;
579
580 agp_copy_info(agp_bridge, &kerninfo);
581 size = vma->vm_end - vma->vm_start;
582 current_size = kerninfo.aper_size;
583 current_size = current_size * 0x100000;
584 offset = vma->vm_pgoff << PAGE_SHIFT;
585 DBG("%lx:%lx", offset, offset+size);
586
587 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) {
588 if ((size + offset) > current_size)
589 goto out_inval;
590
591 client = agp_find_client_by_pid(current->pid);
592
593 if (client == NULL)
594 goto out_eperm;
595
596 if (!agp_find_seg_in_client(client, offset, size, vma->vm_page_prot))
597 goto out_inval;
598
599 DBG("client vm_ops=%p", kerninfo.vm_ops);
600 if (kerninfo.vm_ops) {
601 vma->vm_ops = kerninfo.vm_ops;
602 } else if (io_remap_pfn_range(vma, vma->vm_start,
603 (kerninfo.aper_base + offset) >> PAGE_SHIFT,
604 size, vma->vm_page_prot)) {
605 goto out_again;
606 }
16867823 607 mutex_unlock(&(agp_fe.agp_mutex));
1da177e4
LT		 608 return 0;
609 }
610
611 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
612 if (size != current_size)
613 goto out_inval;
614
615 DBG("controller vm_ops=%p", kerninfo.vm_ops);
616 if (kerninfo.vm_ops) {
617 vma->vm_ops = kerninfo.vm_ops;
618 } else if (io_remap_pfn_range(vma, vma->vm_start,
619 kerninfo.aper_base >> PAGE_SHIFT,
620 size, vma->vm_page_prot)) {
621 goto out_again;
622 }
16867823 623 mutex_unlock(&(agp_fe.agp_mutex));
1da177e4
LT		 624 return 0;
625 }
626
627out_eperm:
16867823 628 mutex_unlock(&(agp_fe.agp_mutex));
1da177e4
LT		 629 return -EPERM;
630
631out_inval:
16867823 632 mutex_unlock(&(agp_fe.agp_mutex));
1da177e4
LT		 633 return -EINVAL;
634
635out_again:
16867823 636 mutex_unlock(&(agp_fe.agp_mutex));
1da177e4
LT		 637 return -EAGAIN;
638}
639
640static int agp_release(struct inode *inode, struct file *file)
641{
642 struct agp_file_private *priv = file->private_data;
643
16867823 644 mutex_lock(&(agp_fe.agp_mutex));
1da177e4
LT		 645
646 DBG("priv=%p", priv);
647
648 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
649 struct agp_controller *controller;
650
651 controller = agp_find_controller_by_pid(priv->my_pid);
652
653 if (controller != NULL) {
654 if (controller == agp_fe.current_controller)
655 agp_controller_release_current(controller, priv);
656 agp_remove_controller(controller);
657 controller = NULL;
658 }
659 }
660
661 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags))
662 agp_remove_client(priv->my_pid);
663
664 agp_remove_file_private(priv);
665 kfree(priv);
666 file->private_data = NULL;
16867823 667 mutex_unlock(&(agp_fe.agp_mutex));
1da177e4
LT		 668 return 0;
669}
670
671static int agp_open(struct inode *inode, struct file *file)
672{
673 int minor = iminor(inode);
674 struct agp_file_private *priv;
675 struct agp_client *client;
676 int rc = -ENXIO;
677
16867823 678 mutex_lock(&(agp_fe.agp_mutex));
1da177e4
LT		 679
680 if (minor != AGPGART_MINOR)
681 goto err_out;
682
0ea27d9f 683 priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL);
1da177e4
LT		 684 if (priv == NULL)
685 goto err_out_nomem;
686
1da177e4
LT		 687 set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags);
688 priv->my_pid = current->pid;
689
690 if ((current->uid == 0) || (current->suid == 0)) {
691 /* Root priv, can be controller */
692 set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags);
693 }
694 client = agp_find_client_by_pid(current->pid);
695
696 if (client != NULL) {
697 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
698 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
699 }
700 file->private_data = (void *) priv;
701 agp_insert_file_private(priv);
702 DBG("private=%p, client=%p", priv, client);
16867823 703 mutex_unlock(&(agp_fe.agp_mutex));
1da177e4
LT		 704 return 0;
705
706err_out_nomem:
707 rc = -ENOMEM;
708err_out:
16867823 709 mutex_unlock(&(agp_fe.agp_mutex));
1da177e4
LT		 710 return rc;
711}
712
713
714static ssize_t agp_read(struct file *file, char __user *buf,
715 size_t count, loff_t * ppos)
716{
717 return -EINVAL;
718}
719
720static ssize_t agp_write(struct file *file, const char __user *buf,
721 size_t count, loff_t * ppos)
722{
723 return -EINVAL;
724}
725
726static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
727{
728 struct agp_info userinfo;
729 struct agp_kern_info kerninfo;
730
731 agp_copy_info(agp_bridge, &kerninfo);
732
733 userinfo.version.major = kerninfo.version.major;
734 userinfo.version.minor = kerninfo.version.minor;
735 userinfo.bridge_id = kerninfo.device->vendor |
736 (kerninfo.device->device << 16);
737 userinfo.agp_mode = kerninfo.mode;
738 userinfo.aper_base = kerninfo.aper_base;
739 userinfo.aper_size = kerninfo.aper_size;
740 userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory;
741 userinfo.pg_used = kerninfo.current_memory;
742
743 if (copy_to_user(arg, &userinfo, sizeof(struct agp_info)))
744 return -EFAULT;
745
746 return 0;
747}
748
749static int agpioc_acquire_wrap(struct agp_file_private *priv)
750{
751 struct agp_controller *controller;
752
753 DBG("");
754
755 if (!(test_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags)))
756 return -EPERM;
757
758 if (agp_fe.current_controller != NULL)
759 return -EBUSY;
760
6a92a4e0 761 if (!agp_bridge)
1da177e4
LT		 762 return -ENODEV;
763
764 if (atomic_read(&agp_bridge->agp_in_use))
765 return -EBUSY;
766
767 atomic_inc(&agp_bridge->agp_in_use);
768
769 agp_fe.backend_acquired = TRUE;
770
771 controller = agp_find_controller_by_pid(priv->my_pid);
772
773 if (controller != NULL) {
774 agp_controller_make_current(controller);
775 } else {
776 controller = agp_create_controller(priv->my_pid);
777
778 if (controller == NULL) {
779 agp_fe.backend_acquired = FALSE;
780 agp_backend_release(agp_bridge);
781 return -ENOMEM;
782 }
783 agp_insert_controller(controller);
784 agp_controller_make_current(controller);
785 }
786
787 set_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags);
788 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
789 return 0;
790}
791
792static int agpioc_release_wrap(struct agp_file_private *priv)
793{
794 DBG("");
795 agp_controller_release_current(agp_fe.current_controller, priv);
796 return 0;
797}
798
799static int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg)
800{
801 struct agp_setup mode;
802
803 DBG("");
804 if (copy_from_user(&mode, arg, sizeof(struct agp_setup)))
805 return -EFAULT;
806
807 agp_enable(agp_bridge, mode.agp_mode);
808 return 0;
809}
810
811static int agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg)
812{
813 struct agp_region reserve;
814 struct agp_client *client;
815 struct agp_file_private *client_priv;
816
817 DBG("");
818 if (copy_from_user(&reserve, arg, sizeof(struct agp_region)))
819 return -EFAULT;
820
821 if ((unsigned) reserve.seg_count >= ~0U/sizeof(struct agp_segment))
822 return -EFAULT;
823
824 client = agp_find_client_by_pid(reserve.pid);
825
826 if (reserve.seg_count == 0) {
827 /* remove a client */
828 client_priv = agp_find_private(reserve.pid);
829
830 if (client_priv != NULL) {
831 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
832 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
833 }
834 if (client == NULL) {
835 /* client is already removed */
836 return 0;
837 }
838 return agp_remove_client(reserve.pid);
839 } else {
840 struct agp_segment *segment;
841
842 if (reserve.seg_count >= 16384)
843 return -EINVAL;
844
845 segment = kmalloc((sizeof(struct agp_segment) * reserve.seg_count),
846 GFP_KERNEL);
847
848 if (segment == NULL)
849 return -ENOMEM;
850
851 if (copy_from_user(segment, (void __user *) reserve.seg_list,
852 sizeof(struct agp_segment) * reserve.seg_count)) {
853 kfree(segment);
854 return -EFAULT;
855 }
856 reserve.seg_list = segment;
857
858 if (client == NULL) {
859 /* Create the client and add the segment */
860 client = agp_create_client(reserve.pid);
861
862 if (client == NULL) {
863 kfree(segment);
864 return -ENOMEM;
865 }
866 client_priv = agp_find_private(reserve.pid);
867
868 if (client_priv != NULL) {
869 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
870 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
871 }
872 }
873 return agp_create_segment(client, &reserve);
874 }
875 /* Will never really happen */
876 return -EINVAL;
877}
878
879static int agpioc_protect_wrap(struct agp_file_private *priv)
880{
881 DBG("");
882 /* This function is not currently implemented */
883 return -EINVAL;
884}
885
886static int agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg)
887{
888 struct agp_memory *memory;
889 struct agp_allocate alloc;
890
891 DBG("");
892 if (copy_from_user(&alloc, arg, sizeof(struct agp_allocate)))
893 return -EFAULT;
894
895 memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);
896
897 if (memory == NULL)
898 return -ENOMEM;
899
900 alloc.key = memory->key;
901 alloc.physical = memory->physical;
902
903 if (copy_to_user(arg, &alloc, sizeof(struct agp_allocate))) {
904 agp_free_memory_wrap(memory);
905 return -EFAULT;
906 }
907 return 0;
908}
909
910static int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg)
911{
912 struct agp_memory *memory;
913
914 DBG("");
915 memory = agp_find_mem_by_key(arg);
916
917 if (memory == NULL)
918 return -EINVAL;
919
920 agp_free_memory_wrap(memory);
921 return 0;
922}
923
924static int agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg)
925{
926 struct agp_bind bind_info;
927 struct agp_memory *memory;
928
929 DBG("");
930 if (copy_from_user(&bind_info, arg, sizeof(struct agp_bind)))
931 return -EFAULT;
932
933 memory = agp_find_mem_by_key(bind_info.key);
934
935 if (memory == NULL)
936 return -EINVAL;
937
938 return agp_bind_memory(memory, bind_info.pg_start);
939}
940
941static int agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg)
942{
943 struct agp_memory *memory;
944 struct agp_unbind unbind;
945
946 DBG("");
947 if (copy_from_user(&unbind, arg, sizeof(struct agp_unbind)))
948 return -EFAULT;
949
950 memory = agp_find_mem_by_key(unbind.key);
951
952 if (memory == NULL)
953 return -EINVAL;
954
955 return agp_unbind_memory(memory);
956}
957
958static int agp_ioctl(struct inode *inode, struct file *file,
959 unsigned int cmd, unsigned long arg)
960{
961 struct agp_file_private *curr_priv = file->private_data;
962 int ret_val = -ENOTTY;
963
964 DBG("priv=%p, cmd=%x", curr_priv, cmd);
16867823 965 mutex_lock(&(agp_fe.agp_mutex));
1da177e4
LT		 966
967 if ((agp_fe.current_controller == NULL) &&
968 (cmd != AGPIOC_ACQUIRE)) {
969 ret_val = -EINVAL;
970 goto ioctl_out;
971 }
972 if ((agp_fe.backend_acquired != TRUE) &&
973 (cmd != AGPIOC_ACQUIRE)) {
974 ret_val = -EBUSY;
975 goto ioctl_out;
976 }
977 if (cmd != AGPIOC_ACQUIRE) {
978 if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) {
979 ret_val = -EPERM;
980 goto ioctl_out;
981 }
982 /* Use the original pid of the controller,
983 * in case it's threaded */
984
985 if (agp_fe.current_controller->pid != curr_priv->my_pid) {
986 ret_val = -EBUSY;
987 goto ioctl_out;
988 }
989 }
990
991 switch (cmd) {
992 case AGPIOC_INFO:
993 ret_val = agpioc_info_wrap(curr_priv, (void __user *) arg);
994 break;
995
996 case AGPIOC_ACQUIRE:
997 ret_val = agpioc_acquire_wrap(curr_priv);
998 break;
999
1000 case AGPIOC_RELEASE:
1001 ret_val = agpioc_release_wrap(curr_priv);
1002 break;
1003
1004 case AGPIOC_SETUP:
1005 ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg);
1006 break;
1007
1008 case AGPIOC_RESERVE:
1009 ret_val = agpioc_reserve_wrap(curr_priv, (void __user *) arg);
1010 break;
1011
1012 case AGPIOC_PROTECT:
1013 ret_val = agpioc_protect_wrap(curr_priv);
1014 break;
1015
1016 case AGPIOC_ALLOCATE:
1017 ret_val = agpioc_allocate_wrap(curr_priv, (void __user *) arg);
1018 break;
1019
1020 case AGPIOC_DEALLOCATE:
1021 ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg);
1022 break;
1023
1024 case AGPIOC_BIND:
1025 ret_val = agpioc_bind_wrap(curr_priv, (void __user *) arg);
1026 break;
1027
1028 case AGPIOC_UNBIND:
1029 ret_val = agpioc_unbind_wrap(curr_priv, (void __user *) arg);
1030 break;
1031 }
1032
1033ioctl_out:
1034 DBG("ioctl returns %d\n", ret_val);
16867823 1035 mutex_unlock(&(agp_fe.agp_mutex));
1da177e4
LT		 1036 return ret_val;
1037}
1038
62322d25 1039static const struct file_operations agp_fops =
1da177e4
LT		 1040{
1041 .owner = THIS_MODULE,
1042 .llseek = no_llseek,
1043 .read = agp_read,
1044 .write = agp_write,
1045 .ioctl = agp_ioctl,
1046 .mmap = agp_mmap,
1047 .open = agp_open,
1048 .release = agp_release,
1049};
1050
1051static struct miscdevice agp_miscdev =
1052{
1053 .minor = AGPGART_MINOR,
1054 .name = "agpgart",
1055 .fops = &agp_fops
1056};
1057
1058int agp_frontend_initialize(void)
1059{
1060 memset(&agp_fe, 0, sizeof(struct agp_front_data));
16867823 1061 mutex_init(&(agp_fe.agp_mutex));
1da177e4
LT		 1062
1063 if (misc_register(&agp_miscdev)) {
1064 printk(KERN_ERR PFX "unable to get minor: %d\n", AGPGART_MINOR);
1065 return -EIO;
1066 }
1067 return 0;
1068}
1069
1070void agp_frontend_cleanup(void)
1071{
1072 misc_deregister(&agp_miscdev);
1073}
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