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