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 <linux/smp_lock.h>
43 #include <asm/uaccess.h>
44 #include <asm/pgtable.h>
45 #include "agp.h"
46
47 struct agp_front_data agp_fe;
48
49 struct agp_memory *agp_find_mem_by_key(int key)
50 {
51 struct agp_memory *curr;
52
53 if (agp_fe.current_controller == NULL)
54 return NULL;
55
56 curr = agp_fe.current_controller->pool;
57
58 while (curr != NULL) {
59 if (curr->key == key)
60 break;
61 curr = curr->next;
62 }
63
64 DBG("key=%d -> mem=%p", key, curr);
65 return curr;
66 }
67
68 static void agp_remove_from_pool(struct agp_memory *temp)
69 {
70 struct agp_memory *prev;
71 struct agp_memory *next;
72
73 /* Check to see if this is even in the memory pool */
74
75 DBG("mem=%p", temp);
76 if (agp_find_mem_by_key(temp->key) != NULL) {
77 next = temp->next;
78 prev = temp->prev;
79
80 if (prev != NULL) {
81 prev->next = next;
82 if (next != NULL)
83 next->prev = prev;
84
85 } else {
86 /* This is the first item on the list */
87 if (next != NULL)
88 next->prev = NULL;
89
90 agp_fe.current_controller->pool = next;
91 }
92 }
93 }
94
95 /*
96 * Routines for managing each client's segment list -
97 * These routines handle adding and removing segments
98 * to each auth'ed client.
99 */
100
101 static struct
102 agp_segment_priv *agp_find_seg_in_client(const struct agp_client *client,
103 unsigned long offset,
104 int size, pgprot_t page_prot)
105 {
106 struct agp_segment_priv *seg;
107 int num_segments, i;
108 off_t pg_start;
109 size_t pg_count;
110
111 pg_start = offset / 4096;
112 pg_count = size / 4096;
113 seg = *(client->segments);
114 num_segments = client->num_segments;
115
116 for (i = 0; i < client->num_segments; i++) {
117 if ((seg[i].pg_start == pg_start) &&
118 (seg[i].pg_count == pg_count) &&
119 (pgprot_val(seg[i].prot) == pgprot_val(page_prot))) {
120 return seg + i;
121 }
122 }
123
124 return NULL;
125 }
126
127 static void agp_remove_seg_from_client(struct agp_client *client)
128 {
129 DBG("client=%p", client);
130
131 if (client->segments != NULL) {
132 if (*(client->segments) != NULL) {
133 DBG("Freeing %p from client %p", *(client->segments), client);
134 kfree(*(client->segments));
135 }
136 DBG("Freeing %p from client %p", client->segments, client);
137 kfree(client->segments);
138 client->segments = NULL;
139 }
140 }
141
142 static void agp_add_seg_to_client(struct agp_client *client,
143 struct agp_segment_priv ** seg, int num_segments)
144 {
145 struct agp_segment_priv **prev_seg;
146
147 prev_seg = client->segments;
148
149 if (prev_seg != NULL)
150 agp_remove_seg_from_client(client);
151
152 DBG("Adding seg %p (%d segments) to client %p", seg, num_segments, client);
153 client->num_segments = num_segments;
154 client->segments = seg;
155 }
156
157 static pgprot_t agp_convert_mmap_flags(int prot)
158 {
159 unsigned long prot_bits;
160
161 prot_bits = calc_vm_prot_bits(prot) | VM_SHARED;
162 return vm_get_page_prot(prot_bits);
163 }
164
165 int agp_create_segment(struct agp_client *client, struct agp_region *region)
166 {
167 struct agp_segment_priv **ret_seg;
168 struct agp_segment_priv *seg;
169 struct agp_segment *user_seg;
170 size_t i;
171
172 seg = kzalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL);
173 if (seg == NULL) {
174 kfree(region->seg_list);
175 region->seg_list = NULL;
176 return -ENOMEM;
177 }
178 user_seg = region->seg_list;
179
180 for (i = 0; i < region->seg_count; i++) {
181 seg[i].pg_start = user_seg[i].pg_start;
182 seg[i].pg_count = user_seg[i].pg_count;
183 seg[i].prot = agp_convert_mmap_flags(user_seg[i].prot);
184 }
185 kfree(region->seg_list);
186 region->seg_list = NULL;
187
188 ret_seg = kmalloc(sizeof(void *), GFP_KERNEL);
189 if (ret_seg == NULL) {
190 kfree(seg);
191 return -ENOMEM;
192 }
193 *ret_seg = seg;
194 agp_add_seg_to_client(client, ret_seg, region->seg_count);
195 return 0;
196 }
197
198 /* End - Routines for managing each client's segment list */
199
200 /* This function must only be called when current_controller != NULL */
201 static void agp_insert_into_pool(struct agp_memory * temp)
202 {
203 struct agp_memory *prev;
204
205 prev = agp_fe.current_controller->pool;
206
207 if (prev != NULL) {
208 prev->prev = temp;
209 temp->next = prev;
210 }
211 agp_fe.current_controller->pool = temp;
212 }
213
214
215 /* File private list routines */
216
217 struct agp_file_private *agp_find_private(pid_t pid)
218 {
219 struct agp_file_private *curr;
220
221 curr = agp_fe.file_priv_list;
222
223 while (curr != NULL) {
224 if (curr->my_pid == pid)
225 return curr;
226 curr = curr->next;
227 }
228
229 return NULL;
230 }
231
232 static void agp_insert_file_private(struct agp_file_private * priv)
233 {
234 struct agp_file_private *prev;
235
236 prev = agp_fe.file_priv_list;
237
238 if (prev != NULL)
239 prev->prev = priv;
240 priv->next = prev;
241 agp_fe.file_priv_list = priv;
242 }
243
244 static void agp_remove_file_private(struct agp_file_private * priv)
245 {
246 struct agp_file_private *next;
247 struct agp_file_private *prev;
248
249 next = priv->next;
250 prev = priv->prev;
251
252 if (prev != NULL) {
253 prev->next = next;
254
255 if (next != NULL)
256 next->prev = prev;
257
258 } else {
259 if (next != NULL)
260 next->prev = NULL;
261
262 agp_fe.file_priv_list = next;
263 }
264 }
265
266 /* End - File flag list routines */
267
268 /*
269 * Wrappers for agp_free_memory & agp_allocate_memory
270 * These make sure that internal lists are kept updated.
271 */
272 void agp_free_memory_wrap(struct agp_memory *memory)
273 {
274 agp_remove_from_pool(memory);
275 agp_free_memory(memory);
276 }
277
278 struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type)
279 {
280 struct agp_memory *memory;
281
282 memory = agp_allocate_memory(agp_bridge, pg_count, type);
283 if (memory == NULL)
284 return NULL;
285
286 agp_insert_into_pool(memory);
287 return memory;
288 }
289
290 /* Routines for managing the list of controllers -
291 * These routines manage the current controller, and the list of
292 * controllers
293 */
294
295 static struct agp_controller *agp_find_controller_by_pid(pid_t id)
296 {
297 struct agp_controller *controller;
298
299 controller = agp_fe.controllers;
300
301 while (controller != NULL) {
302 if (controller->pid == id)
303 return controller;
304 controller = controller->next;
305 }
306
307 return NULL;
308 }
309
310 static struct agp_controller *agp_create_controller(pid_t id)
311 {
312 struct agp_controller *controller;
313
314 controller = kzalloc(sizeof(struct agp_controller), GFP_KERNEL);
315 if (controller == NULL)
316 return NULL;
317
318 controller->pid = id;
319 return controller;
320 }
321
322 static int agp_insert_controller(struct agp_controller *controller)
323 {
324 struct agp_controller *prev_controller;
325
326 prev_controller = agp_fe.controllers;
327 controller->next = prev_controller;
328
329 if (prev_controller != NULL)
330 prev_controller->prev = controller;
331
332 agp_fe.controllers = controller;
333
334 return 0;
335 }
336
337 static void agp_remove_all_clients(struct agp_controller *controller)
338 {
339 struct agp_client *client;
340 struct agp_client *temp;
341
342 client = controller->clients;
343
344 while (client) {
345 struct agp_file_private *priv;
346
347 temp = client;
348 agp_remove_seg_from_client(temp);
349 priv = agp_find_private(temp->pid);
350
351 if (priv != NULL) {
352 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
353 clear_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
354 }
355 client = client->next;
356 kfree(temp);
357 }
358 }
359
360 static void agp_remove_all_memory(struct agp_controller *controller)
361 {
362 struct agp_memory *memory;
363 struct agp_memory *temp;
364
365 memory = controller->pool;
366
367 while (memory) {
368 temp = memory;
369 memory = memory->next;
370 agp_free_memory_wrap(temp);
371 }
372 }
373
374 static int agp_remove_controller(struct agp_controller *controller)
375 {
376 struct agp_controller *prev_controller;
377 struct agp_controller *next_controller;
378
379 prev_controller = controller->prev;
380 next_controller = controller->next;
381
382 if (prev_controller != NULL) {
383 prev_controller->next = next_controller;
384 if (next_controller != NULL)
385 next_controller->prev = prev_controller;
386
387 } else {
388 if (next_controller != NULL)
389 next_controller->prev = NULL;
390
391 agp_fe.controllers = next_controller;
392 }
393
394 agp_remove_all_memory(controller);
395 agp_remove_all_clients(controller);
396
397 if (agp_fe.current_controller == controller) {
398 agp_fe.current_controller = NULL;
399 agp_fe.backend_acquired = false;
400 agp_backend_release(agp_bridge);
401 }
402 kfree(controller);
403 return 0;
404 }
405
406 static void agp_controller_make_current(struct agp_controller *controller)
407 {
408 struct agp_client *clients;
409
410 clients = controller->clients;
411
412 while (clients != NULL) {
413 struct agp_file_private *priv;
414
415 priv = agp_find_private(clients->pid);
416
417 if (priv != NULL) {
418 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
419 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
420 }
421 clients = clients->next;
422 }
423
424 agp_fe.current_controller = controller;
425 }
426
427 static void agp_controller_release_current(struct agp_controller *controller,
428 struct agp_file_private *controller_priv)
429 {
430 struct agp_client *clients;
431
432 clear_bit(AGP_FF_IS_VALID, &controller_priv->access_flags);
433 clients = controller->clients;
434
435 while (clients != NULL) {
436 struct agp_file_private *priv;
437
438 priv = agp_find_private(clients->pid);
439
440 if (priv != NULL)
441 clear_bit(AGP_FF_IS_VALID, &priv->access_flags);
442
443 clients = clients->next;
444 }
445
446 agp_fe.current_controller = NULL;
447 agp_fe.used_by_controller = false;
448 agp_backend_release(agp_bridge);
449 }
450
451 /*
452 * Routines for managing client lists -
453 * These routines are for managing the list of auth'ed clients.
454 */
455
456 static struct agp_client
457 *agp_find_client_in_controller(struct agp_controller *controller, pid_t id)
458 {
459 struct agp_client *client;
460
461 if (controller == NULL)
462 return NULL;
463
464 client = controller->clients;
465
466 while (client != NULL) {
467 if (client->pid == id)
468 return client;
469 client = client->next;
470 }
471
472 return NULL;
473 }
474
475 static struct agp_controller *agp_find_controller_for_client(pid_t id)
476 {
477 struct agp_controller *controller;
478
479 controller = agp_fe.controllers;
480
481 while (controller != NULL) {
482 if ((agp_find_client_in_controller(controller, id)) != NULL)
483 return controller;
484 controller = controller->next;
485 }
486
487 return NULL;
488 }
489
490 struct agp_client *agp_find_client_by_pid(pid_t id)
491 {
492 struct agp_client *temp;
493
494 if (agp_fe.current_controller == NULL)
495 return NULL;
496
497 temp = agp_find_client_in_controller(agp_fe.current_controller, id);
498 return temp;
499 }
500
501 static void agp_insert_client(struct agp_client *client)
502 {
503 struct agp_client *prev_client;
504
505 prev_client = agp_fe.current_controller->clients;
506 client->next = prev_client;
507
508 if (prev_client != NULL)
509 prev_client->prev = client;
510
511 agp_fe.current_controller->clients = client;
512 agp_fe.current_controller->num_clients++;
513 }
514
515 struct agp_client *agp_create_client(pid_t id)
516 {
517 struct agp_client *new_client;
518
519 new_client = kzalloc(sizeof(struct agp_client), GFP_KERNEL);
520 if (new_client == NULL)
521 return NULL;
522
523 new_client->pid = id;
524 agp_insert_client(new_client);
525 return new_client;
526 }
527
528 int agp_remove_client(pid_t id)
529 {
530 struct agp_client *client;
531 struct agp_client *prev_client;
532 struct agp_client *next_client;
533 struct agp_controller *controller;
534
535 controller = agp_find_controller_for_client(id);
536 if (controller == NULL)
537 return -EINVAL;
538
539 client = agp_find_client_in_controller(controller, id);
540 if (client == NULL)
541 return -EINVAL;
542
543 prev_client = client->prev;
544 next_client = client->next;
545
546 if (prev_client != NULL) {
547 prev_client->next = next_client;
548 if (next_client != NULL)
549 next_client->prev = prev_client;
550
551 } else {
552 if (next_client != NULL)
553 next_client->prev = NULL;
554 controller->clients = next_client;
555 }
556
557 controller->num_clients--;
558 agp_remove_seg_from_client(client);
559 kfree(client);
560 return 0;
561 }
562
563 /* End - Routines for managing client lists */
564
565 /* File Operations */
566
567 static int agp_mmap(struct file *file, struct vm_area_struct *vma)
568 {
569 unsigned int size, current_size;
570 unsigned long offset;
571 struct agp_client *client;
572 struct agp_file_private *priv = file->private_data;
573 struct agp_kern_info kerninfo;
574
575 mutex_lock(&(agp_fe.agp_mutex));
576
577 if (agp_fe.backend_acquired != true)
578 goto out_eperm;
579
580 if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags)))
581 goto out_eperm;
582
583 agp_copy_info(agp_bridge, &kerninfo);
584 size = vma->vm_end - vma->vm_start;
585 current_size = kerninfo.aper_size;
586 current_size = current_size * 0x100000;
587 offset = vma->vm_pgoff << PAGE_SHIFT;
588 DBG("%lx:%lx", offset, offset+size);
589
590 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) {
591 if ((size + offset) > current_size)
592 goto out_inval;
593
594 client = agp_find_client_by_pid(current->pid);
595
596 if (client == NULL)
597 goto out_eperm;
598
599 if (!agp_find_seg_in_client(client, offset, size, vma->vm_page_prot))
600 goto out_inval;
601
602 DBG("client vm_ops=%p", kerninfo.vm_ops);
603 if (kerninfo.vm_ops) {
604 vma->vm_ops = kerninfo.vm_ops;
605 } else if (io_remap_pfn_range(vma, vma->vm_start,
606 (kerninfo.aper_base + offset) >> PAGE_SHIFT,
607 size, vma->vm_page_prot)) {
608 goto out_again;
609 }
610 mutex_unlock(&(agp_fe.agp_mutex));
611 return 0;
612 }
613
614 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
615 if (size != current_size)
616 goto out_inval;
617
618 DBG("controller vm_ops=%p", kerninfo.vm_ops);
619 if (kerninfo.vm_ops) {
620 vma->vm_ops = kerninfo.vm_ops;
621 } else if (io_remap_pfn_range(vma, vma->vm_start,
622 kerninfo.aper_base >> PAGE_SHIFT,
623 size, vma->vm_page_prot)) {
624 goto out_again;
625 }
626 mutex_unlock(&(agp_fe.agp_mutex));
627 return 0;
628 }
629
630 out_eperm:
631 mutex_unlock(&(agp_fe.agp_mutex));
632 return -EPERM;
633
634 out_inval:
635 mutex_unlock(&(agp_fe.agp_mutex));
636 return -EINVAL;
637
638 out_again:
639 mutex_unlock(&(agp_fe.agp_mutex));
640 return -EAGAIN;
641 }
642
643 static int agp_release(struct inode *inode, struct file *file)
644 {
645 struct agp_file_private *priv = file->private_data;
646
647 mutex_lock(&(agp_fe.agp_mutex));
648
649 DBG("priv=%p", priv);
650
651 if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) {
652 struct agp_controller *controller;
653
654 controller = agp_find_controller_by_pid(priv->my_pid);
655
656 if (controller != NULL) {
657 if (controller == agp_fe.current_controller)
658 agp_controller_release_current(controller, priv);
659 agp_remove_controller(controller);
660 controller = NULL;
661 }
662 }
663
664 if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags))
665 agp_remove_client(priv->my_pid);
666
667 agp_remove_file_private(priv);
668 kfree(priv);
669 file->private_data = NULL;
670 mutex_unlock(&(agp_fe.agp_mutex));
671 return 0;
672 }
673
674 static int agp_open(struct inode *inode, struct file *file)
675 {
676 int minor = iminor(inode);
677 struct agp_file_private *priv;
678 struct agp_client *client;
679 int rc = -ENXIO;
680
681 lock_kernel();
682 mutex_lock(&(agp_fe.agp_mutex));
683
684 if (minor != AGPGART_MINOR)
685 goto err_out;
686
687 priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL);
688 if (priv == NULL)
689 goto err_out_nomem;
690
691 set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags);
692 priv->my_pid = current->pid;
693
694 if (capable(CAP_SYS_RAWIO)) {
695 /* Root priv, can be controller */
696 set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags);
697 }
698 client = agp_find_client_by_pid(current->pid);
699
700 if (client != NULL) {
701 set_bit(AGP_FF_IS_CLIENT, &priv->access_flags);
702 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
703 }
704 file->private_data = (void *) priv;
705 agp_insert_file_private(priv);
706 DBG("private=%p, client=%p", priv, client);
707 mutex_unlock(&(agp_fe.agp_mutex));
708 unlock_kernel();
709 return 0;
710
711 err_out_nomem:
712 rc = -ENOMEM;
713 err_out:
714 mutex_unlock(&(agp_fe.agp_mutex));
715 unlock_kernel();
716 return rc;
717 }
718
719
720 static ssize_t agp_read(struct file *file, char __user *buf,
721 size_t count, loff_t * ppos)
722 {
723 return -EINVAL;
724 }
725
726 static ssize_t agp_write(struct file *file, const char __user *buf,
727 size_t count, loff_t * ppos)
728 {
729 return -EINVAL;
730 }
731
732 static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
733 {
734 struct agp_info userinfo;
735 struct agp_kern_info kerninfo;
736
737 agp_copy_info(agp_bridge, &kerninfo);
738
739 userinfo.version.major = kerninfo.version.major;
740 userinfo.version.minor = kerninfo.version.minor;
741 userinfo.bridge_id = kerninfo.device->vendor |
742 (kerninfo.device->device << 16);
743 userinfo.agp_mode = kerninfo.mode;
744 userinfo.aper_base = kerninfo.aper_base;
745 userinfo.aper_size = kerninfo.aper_size;
746 userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory;
747 userinfo.pg_used = kerninfo.current_memory;
748
749 if (copy_to_user(arg, &userinfo, sizeof(struct agp_info)))
750 return -EFAULT;
751
752 return 0;
753 }
754
755 int agpioc_acquire_wrap(struct agp_file_private *priv)
756 {
757 struct agp_controller *controller;
758
759 DBG("");
760
761 if (!(test_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags)))
762 return -EPERM;
763
764 if (agp_fe.current_controller != NULL)
765 return -EBUSY;
766
767 if (!agp_bridge)
768 return -ENODEV;
769
770 if (atomic_read(&agp_bridge->agp_in_use))
771 return -EBUSY;
772
773 atomic_inc(&agp_bridge->agp_in_use);
774
775 agp_fe.backend_acquired = true;
776
777 controller = agp_find_controller_by_pid(priv->my_pid);
778
779 if (controller != NULL) {
780 agp_controller_make_current(controller);
781 } else {
782 controller = agp_create_controller(priv->my_pid);
783
784 if (controller == NULL) {
785 agp_fe.backend_acquired = false;
786 agp_backend_release(agp_bridge);
787 return -ENOMEM;
788 }
789 agp_insert_controller(controller);
790 agp_controller_make_current(controller);
791 }
792
793 set_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags);
794 set_bit(AGP_FF_IS_VALID, &priv->access_flags);
795 return 0;
796 }
797
798 int agpioc_release_wrap(struct agp_file_private *priv)
799 {
800 DBG("");
801 agp_controller_release_current(agp_fe.current_controller, priv);
802 return 0;
803 }
804
805 int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg)
806 {
807 struct agp_setup mode;
808
809 DBG("");
810 if (copy_from_user(&mode, arg, sizeof(struct agp_setup)))
811 return -EFAULT;
812
813 agp_enable(agp_bridge, mode.agp_mode);
814 return 0;
815 }
816
817 static int agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg)
818 {
819 struct agp_region reserve;
820 struct agp_client *client;
821 struct agp_file_private *client_priv;
822
823 DBG("");
824 if (copy_from_user(&reserve, arg, sizeof(struct agp_region)))
825 return -EFAULT;
826
827 if ((unsigned) reserve.seg_count >= ~0U/sizeof(struct agp_segment))
828 return -EFAULT;
829
830 client = agp_find_client_by_pid(reserve.pid);
831
832 if (reserve.seg_count == 0) {
833 /* remove a client */
834 client_priv = agp_find_private(reserve.pid);
835
836 if (client_priv != NULL) {
837 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
838 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
839 }
840 if (client == NULL) {
841 /* client is already removed */
842 return 0;
843 }
844 return agp_remove_client(reserve.pid);
845 } else {
846 struct agp_segment *segment;
847
848 if (reserve.seg_count >= 16384)
849 return -EINVAL;
850
851 segment = kmalloc((sizeof(struct agp_segment) * reserve.seg_count),
852 GFP_KERNEL);
853
854 if (segment == NULL)
855 return -ENOMEM;
856
857 if (copy_from_user(segment, (void __user *) reserve.seg_list,
858 sizeof(struct agp_segment) * reserve.seg_count)) {
859 kfree(segment);
860 return -EFAULT;
861 }
862 reserve.seg_list = segment;
863
864 if (client == NULL) {
865 /* Create the client and add the segment */
866 client = agp_create_client(reserve.pid);
867
868 if (client == NULL) {
869 kfree(segment);
870 return -ENOMEM;
871 }
872 client_priv = agp_find_private(reserve.pid);
873
874 if (client_priv != NULL) {
875 set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags);
876 set_bit(AGP_FF_IS_VALID, &client_priv->access_flags);
877 }
878 }
879 return agp_create_segment(client, &reserve);
880 }
881 /* Will never really happen */
882 return -EINVAL;
883 }
884
885 int agpioc_protect_wrap(struct agp_file_private *priv)
886 {
887 DBG("");
888 /* This function is not currently implemented */
889 return -EINVAL;
890 }
891
892 static int agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg)
893 {
894 struct agp_memory *memory;
895 struct agp_allocate alloc;
896
897 DBG("");
898 if (copy_from_user(&alloc, arg, sizeof(struct agp_allocate)))
899 return -EFAULT;
900
901 if (alloc.type >= AGP_USER_TYPES)
902 return -EINVAL;
903
904 memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type);
905
906 if (memory == NULL)
907 return -ENOMEM;
908
909 alloc.key = memory->key;
910 alloc.physical = memory->physical;
911
912 if (copy_to_user(arg, &alloc, sizeof(struct agp_allocate))) {
913 agp_free_memory_wrap(memory);
914 return -EFAULT;
915 }
916 return 0;
917 }
918
919 int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg)
920 {
921 struct agp_memory *memory;
922
923 DBG("");
924 memory = agp_find_mem_by_key(arg);
925
926 if (memory == NULL)
927 return -EINVAL;
928
929 agp_free_memory_wrap(memory);
930 return 0;
931 }
932
933 static int agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg)
934 {
935 struct agp_bind bind_info;
936 struct agp_memory *memory;
937
938 DBG("");
939 if (copy_from_user(&bind_info, arg, sizeof(struct agp_bind)))
940 return -EFAULT;
941
942 memory = agp_find_mem_by_key(bind_info.key);
943
944 if (memory == NULL)
945 return -EINVAL;
946
947 return agp_bind_memory(memory, bind_info.pg_start);
948 }
949
950 static int agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg)
951 {
952 struct agp_memory *memory;
953 struct agp_unbind unbind;
954
955 DBG("");
956 if (copy_from_user(&unbind, arg, sizeof(struct agp_unbind)))
957 return -EFAULT;
958
959 memory = agp_find_mem_by_key(unbind.key);
960
961 if (memory == NULL)
962 return -EINVAL;
963
964 return agp_unbind_memory(memory);
965 }
966
967 int agpioc_chipset_flush_wrap(struct agp_file_private *priv)
968 {
969 DBG("");
970 agp_flush_chipset(agp_bridge);
971 return 0;
972 }
973
974 static long agp_ioctl(struct file *file,
975 unsigned int cmd, unsigned long arg)
976 {
977 struct agp_file_private *curr_priv = file->private_data;
978 int ret_val = -ENOTTY;
979
980 DBG("priv=%p, cmd=%x", curr_priv, cmd);
981 mutex_lock(&(agp_fe.agp_mutex));
982
983 if ((agp_fe.current_controller == NULL) &&
984 (cmd != AGPIOC_ACQUIRE)) {
985 ret_val = -EINVAL;
986 goto ioctl_out;
987 }
988 if ((agp_fe.backend_acquired != true) &&
989 (cmd != AGPIOC_ACQUIRE)) {
990 ret_val = -EBUSY;
991 goto ioctl_out;
992 }
993 if (cmd != AGPIOC_ACQUIRE) {
994 if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) {
995 ret_val = -EPERM;
996 goto ioctl_out;
997 }
998 /* Use the original pid of the controller,
999 * in case it's threaded */
1000
1001 if (agp_fe.current_controller->pid != curr_priv->my_pid) {
1002 ret_val = -EBUSY;
1003 goto ioctl_out;
1004 }
1005 }
1006
1007 switch (cmd) {
1008 case AGPIOC_INFO:
1009 ret_val = agpioc_info_wrap(curr_priv, (void __user *) arg);
1010 break;
1011
1012 case AGPIOC_ACQUIRE:
1013 ret_val = agpioc_acquire_wrap(curr_priv);
1014 break;
1015
1016 case AGPIOC_RELEASE:
1017 ret_val = agpioc_release_wrap(curr_priv);
1018 break;
1019
1020 case AGPIOC_SETUP:
1021 ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg);
1022 break;
1023
1024 case AGPIOC_RESERVE:
1025 ret_val = agpioc_reserve_wrap(curr_priv, (void __user *) arg);
1026 break;
1027
1028 case AGPIOC_PROTECT:
1029 ret_val = agpioc_protect_wrap(curr_priv);
1030 break;
1031
1032 case AGPIOC_ALLOCATE:
1033 ret_val = agpioc_allocate_wrap(curr_priv, (void __user *) arg);
1034 break;
1035
1036 case AGPIOC_DEALLOCATE:
1037 ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg);
1038 break;
1039
1040 case AGPIOC_BIND:
1041 ret_val = agpioc_bind_wrap(curr_priv, (void __user *) arg);
1042 break;
1043
1044 case AGPIOC_UNBIND:
1045 ret_val = agpioc_unbind_wrap(curr_priv, (void __user *) arg);
1046 break;
1047
1048 case AGPIOC_CHIPSET_FLUSH:
1049 ret_val = agpioc_chipset_flush_wrap(curr_priv);
1050 break;
1051 }
1052
1053 ioctl_out:
1054 DBG("ioctl returns %d\n", ret_val);
1055 mutex_unlock(&(agp_fe.agp_mutex));
1056 return ret_val;
1057 }
1058
1059 static const struct file_operations agp_fops =
1060 {
1061 .owner = THIS_MODULE,
1062 .llseek = no_llseek,
1063 .read = agp_read,
1064 .write = agp_write,
1065 .unlocked_ioctl = agp_ioctl,
1066 #ifdef CONFIG_COMPAT
1067 .compat_ioctl = compat_agp_ioctl,
1068 #endif
1069 .mmap = agp_mmap,
1070 .open = agp_open,
1071 .release = agp_release,
1072 };
1073
1074 static struct miscdevice agp_miscdev =
1075 {
1076 .minor = AGPGART_MINOR,
1077 .name = "agpgart",
1078 .fops = &agp_fops
1079 };
1080
1081 int agp_frontend_initialize(void)
1082 {
1083 memset(&agp_fe, 0, sizeof(struct agp_front_data));
1084 mutex_init(&(agp_fe.agp_mutex));
1085
1086 if (misc_register(&agp_miscdev)) {
1087 printk(KERN_ERR PFX "unable to get minor: %d\n", AGPGART_MINOR);
1088 return -EIO;
1089 }
1090 return 0;
1091 }
1092
1093 void agp_frontend_cleanup(void)
1094 {
1095 misc_deregister(&agp_miscdev);
1096 }
1097
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