File: /usr/src/linux/drivers/char/agp/agpgart_fe.c
1 /*
2 * AGPGART module frontend version 0.99
3 * Copyright (C) 1999 Jeff Hartmann
4 * Copyright (C) 1999 Precision Insight, Inc.
5 * Copyright (C) 1999 Xi Graphics, Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
23 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 *
25 */
26
27 #define __NO_VERSION__
28 #include <linux/version.h>
29 #include <linux/types.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/sched.h>
33 #include <linux/mm.h>
34 #include <linux/string.h>
35 #include <linux/errno.h>
36 #include <linux/slab.h>
37 #include <linux/vmalloc.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/pagemap.h>
41 #include <linux/miscdevice.h>
42 #include <linux/agp_backend.h>
43 #include <linux/agpgart.h>
44 #include <linux/smp_lock.h>
45 #include <asm/system.h>
46 #include <asm/uaccess.h>
47 #include <asm/io.h>
48 #include <asm/page.h>
49 #include <asm/mman.h>
50
51 #include "agp.h"
52
53 static struct agp_front_data agp_fe;
54
55 static agp_memory *agp_find_mem_by_key(int key)
56 {
57 agp_memory *curr;
58
59 if (agp_fe.current_controller == NULL) {
60 return NULL;
61 }
62 curr = agp_fe.current_controller->pool;
63
64 while (curr != NULL) {
65 if (curr->key == key) {
66 return curr;
67 }
68 curr = curr->next;
69 }
70
71 return NULL;
72 }
73
74 static void agp_remove_from_pool(agp_memory * temp)
75 {
76 agp_memory *prev;
77 agp_memory *next;
78
79 /* Check to see if this is even in the memory pool */
80
81 if (agp_find_mem_by_key(temp->key) != NULL) {
82 next = temp->next;
83 prev = temp->prev;
84
85 if (prev != NULL) {
86 prev->next = next;
87 if (next != NULL) {
88 next->prev = prev;
89 }
90 } else {
91 /* This is the first item on the list */
92 if (next != NULL) {
93 next->prev = NULL;
94 }
95 agp_fe.current_controller->pool = next;
96 }
97 }
98 }
99
100 /*
101 * Routines for managing each client's segment list -
102 * These routines handle adding and removing segments
103 * to each auth'ed client.
104 */
105
106 static agp_segment_priv *agp_find_seg_in_client(const agp_client * client,
107 unsigned long offset,
108 int size, pgprot_t page_prot)
109 {
110 agp_segment_priv *seg;
111 int num_segments, pg_start, pg_count, i;
112
113 pg_start = offset / 4096;
114 pg_count = size / 4096;
115 seg = *(client->segments);
116 num_segments = client->num_segments;
117
118 for (i = 0; i < client->num_segments; i++) {
119 if ((seg[i].pg_start == pg_start) &&
120 (seg[i].pg_count == pg_count) &&
121 (pgprot_val(seg[i].prot) == pgprot_val(page_prot))) {
122 return seg + i;
123 }
124 }
125
126 return NULL;
127 }
128
129 static void agp_remove_seg_from_client(agp_client * client)
130 {
131 if (client->segments != NULL) {
132 if (*(client->segments) != NULL) {
133 kfree(*(client->segments));
134 }
135 kfree(client->segments);
136 }
137 }
138
139 static void agp_add_seg_to_client(agp_client * client,
140 agp_segment_priv ** seg, int num_segments)
141 {
142 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 client->num_segments = num_segments;
150 client->segments = seg;
151 }
152
153 /* Originally taken from linux/mm/mmap.c from the array
154 * protection_map.
155 * The original really should be exported to modules, or
156 * some routine which does the conversion for you
157 */
158
159 static const pgprot_t my_protect_map[16] =
160 {
161 __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111,
162 __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111
163 };
164
165 static pgprot_t agp_convert_mmap_flags(int prot)
166 {
167 #define _trans(x,bit1,bit2) \
168 ((bit1==bit2)?(x&bit1):(x&bit1)?bit2:0)
169
170 unsigned long prot_bits;
171 pgprot_t temp;
172
173 prot_bits = _trans(prot, PROT_READ, VM_READ) |
174 _trans(prot, PROT_WRITE, VM_WRITE) |
175 _trans(prot, PROT_EXEC, VM_EXEC);
176
177 prot_bits |= VM_SHARED;
178
179 temp = my_protect_map[prot_bits & 0x0000000f];
180
181 return temp;
182 }
183
184 static int agp_create_segment(agp_client * client, agp_region * region)
185 {
186 agp_segment_priv **ret_seg;
187 agp_segment_priv *seg;
188 agp_segment *user_seg;
189 int i;
190
191 seg = kmalloc((sizeof(agp_segment_priv) * region->seg_count),
192 GFP_KERNEL);
193 if (seg == NULL) {
194 kfree(region->seg_list);
195 return -ENOMEM;
196 }
197 memset(seg, 0, (sizeof(agp_segment_priv) * region->seg_count));
198 user_seg = region->seg_list;
199
200 for (i = 0; i < region->seg_count; i++) {
201 seg[i].pg_start = user_seg[i].pg_start;
202 seg[i].pg_count = user_seg[i].pg_count;
203 seg[i].prot = agp_convert_mmap_flags(user_seg[i].prot);
204 }
205 ret_seg = kmalloc(sizeof(void *), GFP_KERNEL);
206 if (ret_seg == NULL) {
207 kfree(region->seg_list);
208 kfree(seg);
209 return -ENOMEM;
210 }
211 *ret_seg = seg;
212 kfree(region->seg_list);
213 agp_add_seg_to_client(client, ret_seg, region->seg_count);
214 return 0;
215 }
216
217 /* End - Routines for managing each client's segment list */
218
219 /* This function must only be called when current_controller != NULL */
220 static void agp_insert_into_pool(agp_memory * temp)
221 {
222 agp_memory *prev;
223
224 prev = agp_fe.current_controller->pool;
225
226 if (prev != NULL) {
227 prev->prev = temp;
228 temp->next = prev;
229 }
230 agp_fe.current_controller->pool = temp;
231 }
232
233
234 /* File private list routines */
235
236 agp_file_private *agp_find_private(pid_t pid)
237 {
238 agp_file_private *curr;
239
240 curr = agp_fe.file_priv_list;
241
242 while (curr != NULL) {
243 if (curr->my_pid == pid) {
244 return curr;
245 }
246 curr = curr->next;
247 }
248
249 return NULL;
250 }
251
252 void agp_insert_file_private(agp_file_private * priv)
253 {
254 agp_file_private *prev;
255
256 prev = agp_fe.file_priv_list;
257
258 if (prev != NULL) {
259 prev->prev = priv;
260 }
261 priv->next = prev;
262 agp_fe.file_priv_list = priv;
263 }
264
265 void agp_remove_file_private(agp_file_private * priv)
266 {
267 agp_file_private *next;
268 agp_file_private *prev;
269
270 next = priv->next;
271 prev = priv->prev;
272
273 if (prev != NULL) {
274 prev->next = next;
275
276 if (next != NULL) {
277 next->prev = prev;
278 }
279 } else {
280 if (next != NULL) {
281 next->prev = NULL;
282 }
283 agp_fe.file_priv_list = next;
284 }
285 }
286
287 /* End - File flag list routines */
288
289 /*
290 * Wrappers for agp_free_memory & agp_allocate_memory
291 * These make sure that internal lists are kept updated.
292 */
293 static void agp_free_memory_wrap(agp_memory * memory)
294 {
295 agp_remove_from_pool(memory);
296 agp_free_memory(memory);
297 }
298
299 static agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type)
300 {
301 agp_memory *memory;
302
303 memory = agp_allocate_memory(pg_count, type);
304 printk(KERN_DEBUG "memory : %p\n", memory);
305 if (memory == NULL) {
306 return NULL;
307 }
308 agp_insert_into_pool(memory);
309 return memory;
310 }
311
312 /* Routines for managing the list of controllers -
313 * These routines manage the current controller, and the list of
314 * controllers
315 */
316
317 static agp_controller *agp_find_controller_by_pid(pid_t id)
318 {
319 agp_controller *controller;
320
321 controller = agp_fe.controllers;
322
323 while (controller != NULL) {
324 if (controller->pid == id) {
325 return controller;
326 }
327 controller = controller->next;
328 }
329
330 return NULL;
331 }
332
333 static agp_controller *agp_create_controller(pid_t id)
334 {
335 agp_controller *controller;
336
337 controller = kmalloc(sizeof(agp_controller), GFP_KERNEL);
338
339 if (controller == NULL) {
340 return NULL;
341 }
342 memset(controller, 0, sizeof(agp_controller));
343 controller->pid = id;
344
345 return controller;
346 }
347
348 static int agp_insert_controller(agp_controller * controller)
349 {
350 agp_controller *prev_controller;
351
352 prev_controller = agp_fe.controllers;
353 controller->next = prev_controller;
354
355 if (prev_controller != NULL) {
356 prev_controller->prev = controller;
357 }
358 agp_fe.controllers = controller;
359
360 return 0;
361 }
362
363 static void agp_remove_all_clients(agp_controller * controller)
364 {
365 agp_client *client;
366 agp_client *temp;
367
368 client = controller->clients;
369
370 while (client) {
371 agp_file_private *priv;
372
373 temp = client;
374 agp_remove_seg_from_client(temp);
375 priv = agp_find_private(temp->pid);
376
377 if (priv != NULL) {
378 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
379 clear_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
380 }
381 client = client->next;
382 kfree(temp);
383 }
384 }
385
386 static void agp_remove_all_memory(agp_controller * controller)
387 {
388 agp_memory *memory;
389 agp_memory *temp;
390
391 memory = controller->pool;
392
393 while (memory) {
394 temp = memory;
395 memory = memory->next;
396 agp_free_memory_wrap(temp);
397 }
398 }
399
400 static int agp_remove_controller(agp_controller * controller)
401 {
402 agp_controller *prev_controller;
403 agp_controller *next_controller;
404
405 prev_controller = controller->prev;
406 next_controller = controller->next;
407
408 if (prev_controller != NULL) {
409 prev_controller->next = next_controller;
410 if (next_controller != NULL) {
411 next_controller->prev = prev_controller;
412 }
413 } else {
414 if (next_controller != NULL) {
415 next_controller->prev = NULL;
416 }
417 agp_fe.controllers = next_controller;
418 }
419
420 agp_remove_all_memory(controller);
421 agp_remove_all_clients(controller);
422
423 if (agp_fe.current_controller == controller) {
424 agp_fe.current_controller = NULL;
425 agp_fe.backend_acquired = FALSE;
426 agp_backend_release();
427 }
428 kfree(controller);
429 return 0;
430 }
431
432 static void agp_controller_make_current(agp_controller * controller)
433 {
434 agp_client *clients;
435
436 clients = controller->clients;
437
438 while (clients != NULL) {
439 agp_file_private *priv;
440
441 priv = agp_find_private(clients->pid);
442
443 if (priv != NULL) {
444 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
445 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
446 }
447 clients = clients->next;
448 }
449
450 agp_fe.current_controller = controller;
451 }
452
453 static void agp_controller_release_current(agp_controller * controller,
454 agp_file_private * controller_priv)
455 {
456 agp_client *clients;
457
458 clear_bit(AGP_FF_IS_VALID, &controller_priv->access_flags);
459 clients = controller->clients;
460
461 while (clients != NULL) {
462 agp_file_private *priv;
463
464 priv = agp_find_private(clients->pid);
465
466 if (priv != NULL) {
467 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
468 }
469 clients = clients->next;
470 }
471
472 agp_fe.current_controller = NULL;
473 agp_fe.used_by_controller = FALSE;
474 agp_backend_release();
475 }
476
477 /*
478 * Routines for managing client lists -
479 * These routines are for managing the list of auth'ed clients.
480 */
481
482 static agp_client *agp_find_client_in_controller(agp_controller * controller,
483 pid_t id)
484 {
485 agp_client *client;
486
487 if (controller == NULL) {
488 return NULL;
489 }
490 client = controller->clients;
491
492 while (client != NULL) {
493 if (client->pid == id) {
494 return client;
495 }
496 client = client->next;
497 }
498
499 return NULL;
500 }
501
502 static agp_controller *agp_find_controller_for_client(pid_t id)
503 {
504 agp_controller *controller;
505
506 controller = agp_fe.controllers;
507
508 while (controller != NULL) {
509 if ((agp_find_client_in_controller(controller, id)) != NULL) {
510 return controller;
511 }
512 controller = controller->next;
513 }
514
515 return NULL;
516 }
517
518 static agp_client *agp_find_client_by_pid(pid_t id)
519 {
520 agp_client *temp;
521
522 if (agp_fe.current_controller == NULL) {
523 return NULL;
524 }
525 temp = agp_find_client_in_controller(agp_fe.current_controller, id);
526 return temp;
527 }
528
529 static void agp_insert_client(agp_client * client)
530 {
531 agp_client *prev_client;
532
533 prev_client = agp_fe.current_controller->clients;
534 client->next = prev_client;
535
536 if (prev_client != NULL) {
537 prev_client->prev = client;
538 }
539 agp_fe.current_controller->clients = client;
540 agp_fe.current_controller->num_clients++;
541 }
542
543 static agp_client *agp_create_client(pid_t id)
544 {
545 agp_client *new_client;
546
547 new_client = kmalloc(sizeof(agp_client), GFP_KERNEL);
548
549 if (new_client == NULL) {
550 return NULL;
551 }
552 memset(new_client, 0, sizeof(agp_client));
553 new_client->pid = id;
554 agp_insert_client(new_client);
555 return new_client;
556 }
557
558 static int agp_remove_client(pid_t id)
559 {
560 agp_client *client;
561 agp_client *prev_client;
562 agp_client *next_client;
563 agp_controller *controller;
564
565 controller = agp_find_controller_for_client(id);
566
567 if (controller == NULL) {
568 return -EINVAL;
569 }
570 client = agp_find_client_in_controller(controller, id);
571
572 if (client == NULL) {
573 return -EINVAL;
574 }
575 prev_client = client->prev;
576 next_client = client->next;
577
578 if (prev_client != NULL) {
579 prev_client->next = next_client;
580 if (next_client != NULL) {
581 next_client->prev = prev_client;
582 }
583 } else {
584 if (next_client != NULL) {
585 next_client->prev = NULL;
586 }
587 controller->clients = next_client;
588 }
589
590 controller->num_clients--;
591 agp_remove_seg_from_client(client);
592 kfree(client);
593 return 0;
594 }
595
596 /* End - Routines for managing client lists */
597
598 /* File Operations */
599
600 static int agp_mmap(struct file *file, struct vm_area_struct *vma)
601 {
602 int size;
603 int current_size;
604 unsigned long offset;
605 agp_client *client;
606 agp_file_private *priv = (agp_file_private *) file->private_data;
607 agp_kern_info kerninfo;
608
609 lock_kernel();
610 AGP_LOCK();
611
612 if (agp_fe.backend_acquired != TRUE) {
613 AGP_UNLOCK();
614 unlock_kernel();
615 return -EPERM;
616 }
617 if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags))) {
618 AGP_UNLOCK();
619 unlock_kernel();
620 return -EPERM;
621 }
622 agp_copy_info(&kerninfo);
623 size = vma->vm_end - vma->vm_start;
624 current_size = kerninfo.aper_size;
625 current_size = current_size * 0x100000;
626 offset = vma->vm_pgoff << PAGE_SHIFT;
627
628 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) {
629 if ((size + offset) > current_size) {
630 AGP_UNLOCK();
631 unlock_kernel();
632 return -EINVAL;
633 }
634 client = agp_find_client_by_pid(current->pid);
635
636 if (client == NULL) {
637 AGP_UNLOCK();
638 unlock_kernel();
639 return -EPERM;
640 }
641 if (!agp_find_seg_in_client(client, offset,
642 size, vma->vm_page_prot)) {
643 AGP_UNLOCK();
644 unlock_kernel();
645 return -EINVAL;
646 }
647 if (remap_page_range(vma->vm_start,
648 (kerninfo.aper_base + offset),
649 size, vma->vm_page_prot)) {
650 AGP_UNLOCK();
651 unlock_kernel();
652 return -EAGAIN;
653 }
654 AGP_UNLOCK();
655 unlock_kernel();
656 return 0;
657 }
658 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
659 if (size != current_size) {
660 AGP_UNLOCK();
661 unlock_kernel();
662 return -EINVAL;
663 }
664 if (remap_page_range(vma->vm_start, kerninfo.aper_base,
665 size, vma->vm_page_prot)) {
666 AGP_UNLOCK();
667 unlock_kernel();
668 return -EAGAIN;
669 }
670 AGP_UNLOCK();
671 unlock_kernel();
672 return 0;
673 }
674 AGP_UNLOCK();
675 unlock_kernel();
676 return -EPERM;
677 }
678
679 static int agp_release(struct inode *inode, struct file *file)
680 {
681 agp_file_private *priv = (agp_file_private *) file->private_data;
682
683 lock_kernel();
684 AGP_LOCK();
685
686 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
687 agp_controller *controller;
688
689 controller = agp_find_controller_by_pid(priv->my_pid);
690
691 if (controller != NULL) {
692 if (controller == agp_fe.current_controller) {
693 agp_controller_release_current(controller,
694 priv);
695 }
696 agp_remove_controller(controller);
697 }
698 }
699 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) {
700 agp_remove_client(priv->my_pid);
701 }
702 agp_remove_file_private(priv);
703 kfree(priv);
704 AGP_UNLOCK();
705 unlock_kernel();
706 return 0;
707 }
708
709 static int agp_open(struct inode *inode, struct file *file)
710 {
711 int minor = MINOR(inode->i_rdev);
712 agp_file_private *priv;
713 agp_client *client;
714 int rc = -ENXIO;
715
716 AGP_LOCK();
717
718 if (minor != AGPGART_MINOR)
719 goto err_out;
720
721 priv = kmalloc(sizeof(agp_file_private), GFP_KERNEL);
722 if (priv == NULL)
723 goto err_out_nomem;
724
725 memset(priv, 0, sizeof(agp_file_private));
726 set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags);
727 priv->my_pid = current->pid;
728
729 if ((current->uid == 0) || (current->suid == 0)) {
730 /* Root priv, can be controller */
731 set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags);
732 }
733 client = agp_find_client_by_pid(current->pid);
734
735 if (client != NULL) {
736 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
737 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
738 }
739 file->private_data = (void *) priv;
740 agp_insert_file_private(priv);
741 AGP_UNLOCK();
742 return 0;
743
744 err_out_nomem:
745 rc = -ENOMEM;
746 err_out:
747 AGP_UNLOCK();
748 return rc;
749 }
750
751
752 static ssize_t agp_read(struct file *file, char *buf,
753 size_t count, loff_t * ppos)
754 {
755 return -EINVAL;
756 }
757
758 static ssize_t agp_write(struct file *file, const char *buf,
759 size_t count, loff_t * ppos)
760 {
761 return -EINVAL;
762 }
763
764 static int agpioc_info_wrap(agp_file_private * priv, unsigned long arg)
765 {
766 agp_info userinfo;
767 agp_kern_info kerninfo;
768
769 agp_copy_info(&kerninfo);
770
771 userinfo.version.major = kerninfo.version.major;
772 userinfo.version.minor = kerninfo.version.minor;
773 userinfo.bridge_id = kerninfo.device->vendor |
774 (kerninfo.device->device << 16);
775 userinfo.agp_mode = kerninfo.mode;
776 userinfo.aper_base = kerninfo.aper_base;
777 userinfo.aper_size = kerninfo.aper_size;
778 userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory;
779 userinfo.pg_used = kerninfo.current_memory;
780
781 if (copy_to_user((void *) arg, &userinfo, sizeof(agp_info))) {
782 return -EFAULT;
783 }
784 return 0;
785 }
786
787 static int agpioc_acquire_wrap(agp_file_private * priv, unsigned long arg)
788 {
789 agp_controller *controller;
790 if (!(test_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags))) {
791 return -EPERM;
792 }
793 if (agp_fe.current_controller != NULL) {
794 return -EBUSY;
795 }
796 if ((agp_backend_acquire()) == 0) {
797 agp_fe.backend_acquired = TRUE;
798 } else {
799 return -EBUSY;
800 }
801
802 controller = agp_find_controller_by_pid(priv->my_pid);
803
804 if (controller != NULL) {
805 agp_controller_make_current(controller);
806 } else {
807 controller = agp_create_controller(priv->my_pid);
808
809 if (controller == NULL) {
810 agp_fe.backend_acquired = FALSE;
811 agp_backend_release();
812 return -ENOMEM;
813 }
814 agp_insert_controller(controller);
815 agp_controller_make_current(controller);
816 }
817
818 set_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags);
819 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
820 return 0;
821 }
822
823 static int agpioc_release_wrap(agp_file_private * priv, unsigned long arg)
824 {
825 agp_controller_release_current(agp_fe.current_controller, priv);
826 return 0;
827 }
828
829 static int agpioc_setup_wrap(agp_file_private * priv, unsigned long arg)
830 {
831 agp_setup mode;
832
833 if (copy_from_user(&mode, (void *) arg, sizeof(agp_setup))) {
834 return -EFAULT;
835 }
836 agp_enable(mode.agp_mode);
837 return 0;
838 }
839
840 static int agpioc_reserve_wrap(agp_file_private * priv, unsigned long arg)
841 {
842 agp_region reserve;
843 agp_client *client;
844 agp_file_private *client_priv;
845
846
847 if (copy_from_user(&reserve, (void *) arg, sizeof(agp_region))) {
848 return -EFAULT;
849 }
850 if ((unsigned) reserve.seg_count >= ~0U/sizeof(agp_segment))
851 return -EFAULT;
852
853 client = agp_find_client_by_pid(reserve.pid);
854
855 if (reserve.seg_count == 0) {
856 /* remove a client */
857 client_priv = agp_find_private(reserve.pid);
858
859 if (client_priv != NULL) {
860 set_bit(AGP_FF_IS_CLIENT,
861 &client_priv->access_flags);
862 set_bit(AGP_FF_IS_VALID,
863 &client_priv->access_flags);
864 }
865 if (client == NULL) {
866 /* client is already removed */
867 return 0;
868 }
869 return agp_remove_client(reserve.pid);
870 } else {
871 agp_segment *segment;
872
873 if (reserve.seg_count >= 16384)
874 return -EINVAL;
875
876 segment = kmalloc((sizeof(agp_segment) * reserve.seg_count),
877 GFP_KERNEL);
878
879 if (segment == NULL) {
880 return -ENOMEM;
881 }
882 if (copy_from_user(segment, (void *) reserve.seg_list,
883 sizeof(agp_segment) * reserve.seg_count)) {
884 kfree(segment);
885 return -EFAULT;
886 }
887 reserve.seg_list = segment;
888
889 if (client == NULL) {
890 /* Create the client and add the segment */
891 client = agp_create_client(reserve.pid);
892
893 if (client == NULL) {
894 kfree(segment);
895 return -ENOMEM;
896 }
897 client_priv = agp_find_private(reserve.pid);
898
899 if (client_priv != NULL) {
900 set_bit(AGP_FF_IS_CLIENT,
901 &client_priv->access_flags);
902 set_bit(AGP_FF_IS_VALID,
903 &client_priv->access_flags);
904 }
905 return agp_create_segment(client, &reserve);
906 } else {
907 return agp_create_segment(client, &reserve);
908 }
909 }
910 /* Will never really happen */
911 return -EINVAL;
912 }
913
914 static int agpioc_protect_wrap(agp_file_private * priv, unsigned long arg)
915 {
916 /* This function is not currently implemented */
917 return -EINVAL;
918 }
919
920 static int agpioc_allocate_wrap(agp_file_private * priv, unsigned long arg)
921 {
922 agp_memory *memory;
923 agp_allocate alloc;
924
925 if (copy_from_user(&alloc, (void *) arg, sizeof(agp_allocate))) {
926 return -EFAULT;
927 }
928 memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);
929
930 if (memory == NULL) {
931 return -ENOMEM;
932 }
933 alloc.key = memory->key;
934 alloc.physical = memory->physical;
935
936 if (copy_to_user((void *) arg, &alloc, sizeof(agp_allocate))) {
937 agp_free_memory_wrap(memory);
938 return -EFAULT;
939 }
940 return 0;
941 }
942
943 static int agpioc_deallocate_wrap(agp_file_private * priv, unsigned long arg)
944 {
945 agp_memory *memory;
946
947 memory = agp_find_mem_by_key((int) arg);
948
949 if (memory == NULL) {
950 return -EINVAL;
951 }
952 agp_free_memory_wrap(memory);
953 return 0;
954 }
955
956 static int agpioc_bind_wrap(agp_file_private * priv, unsigned long arg)
957 {
958 agp_bind bind_info;
959 agp_memory *memory;
960
961 if (copy_from_user(&bind_info, (void *) arg, sizeof(agp_bind))) {
962 return -EFAULT;
963 }
964 memory = agp_find_mem_by_key(bind_info.key);
965
966 if (memory == NULL) {
967 return -EINVAL;
968 }
969 return agp_bind_memory(memory, bind_info.pg_start);
970 }
971
972 static int agpioc_unbind_wrap(agp_file_private * priv, unsigned long arg)
973 {
974 agp_memory *memory;
975 agp_unbind unbind;
976
977 if (copy_from_user(&unbind, (void *) arg, sizeof(agp_unbind))) {
978 return -EFAULT;
979 }
980 memory = agp_find_mem_by_key(unbind.key);
981
982 if (memory == NULL) {
983 return -EINVAL;
984 }
985 return agp_unbind_memory(memory);
986 }
987
988 static int agp_ioctl(struct inode *inode, struct file *file,
989 unsigned int cmd, unsigned long arg)
990 {
991 agp_file_private *curr_priv = (agp_file_private *) file->private_data;
992 int ret_val = -ENOTTY;
993
994 AGP_LOCK();
995
996 if ((agp_fe.current_controller == NULL) &&
997 (cmd != AGPIOC_ACQUIRE)) {
998 ret_val = -EINVAL;
999 goto ioctl_out;
1000 }
1001 if ((agp_fe.backend_acquired != TRUE) &&
1002 (cmd != AGPIOC_ACQUIRE)) {
1003 ret_val = -EBUSY;
1004 goto ioctl_out;
1005 }
1006 if (cmd != AGPIOC_ACQUIRE) {
1007 if (!(test_bit(AGP_FF_IS_CONTROLLER,
1008 &curr_priv->access_flags))) {
1009 ret_val = -EPERM;
1010 goto ioctl_out;
1011 }
1012 /* Use the original pid of the controller,
1013 * in case it's threaded */
1014
1015 if (agp_fe.current_controller->pid != curr_priv->my_pid) {
1016 ret_val = -EBUSY;
1017 goto ioctl_out;
1018 }
1019 }
1020 switch (cmd) {
1021 case AGPIOC_INFO:
1022 {
1023 ret_val = agpioc_info_wrap(curr_priv, arg);
1024 goto ioctl_out;
1025 }
1026 case AGPIOC_ACQUIRE:
1027 {
1028 ret_val = agpioc_acquire_wrap(curr_priv, arg);
1029 goto ioctl_out;
1030 }
1031 case AGPIOC_RELEASE:
1032 {
1033 ret_val = agpioc_release_wrap(curr_priv, arg);
1034 goto ioctl_out;
1035 }
1036 case AGPIOC_SETUP:
1037 {
1038 ret_val = agpioc_setup_wrap(curr_priv, arg);
1039 goto ioctl_out;
1040 }
1041 case AGPIOC_RESERVE:
1042 {
1043 ret_val = agpioc_reserve_wrap(curr_priv, arg);
1044 goto ioctl_out;
1045 }
1046 case AGPIOC_PROTECT:
1047 {
1048 ret_val = agpioc_protect_wrap(curr_priv, arg);
1049 goto ioctl_out;
1050 }
1051 case AGPIOC_ALLOCATE:
1052 {
1053 ret_val = agpioc_allocate_wrap(curr_priv, arg);
1054 goto ioctl_out;
1055 }
1056 case AGPIOC_DEALLOCATE:
1057 {
1058 ret_val = agpioc_deallocate_wrap(curr_priv, arg);
1059 goto ioctl_out;
1060 }
1061 case AGPIOC_BIND:
1062 {
1063 ret_val = agpioc_bind_wrap(curr_priv, arg);
1064 goto ioctl_out;
1065 }
1066 case AGPIOC_UNBIND:
1067 {
1068 ret_val = agpioc_unbind_wrap(curr_priv, arg);
1069 goto ioctl_out;
1070 }
1071 }
1072
1073 ioctl_out:
1074 AGP_UNLOCK();
1075 return ret_val;
1076 }
1077
1078 static struct file_operations agp_fops =
1079 {
1080 owner: THIS_MODULE,
1081 llseek: no_llseek,
1082 read: agp_read,
1083 write: agp_write,
1084 ioctl: agp_ioctl,
1085 mmap: agp_mmap,
1086 open: agp_open,
1087 release: agp_release,
1088 };
1089
1090 static struct miscdevice agp_miscdev =
1091 {
1092 AGPGART_MINOR,
1093 AGPGART_MODULE_NAME,
1094 &agp_fops
1095 };
1096
1097 int __init agp_frontend_initialize(void)
1098 {
1099 memset(&agp_fe, 0, sizeof(struct agp_front_data));
1100 AGP_LOCK_INIT();
1101
1102 if (misc_register(&agp_miscdev)) {
1103 printk(KERN_ERR PFX "unable to get minor: %d\n", AGPGART_MINOR);
1104 return -EIO;
1105 }
1106 return 0;
1107 }
1108
1109 void __exit agp_frontend_cleanup(void)
1110 {
1111 misc_deregister(&agp_miscdev);
1112 }
1113
1114