Commit | Line | Data |
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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> | |
4e950f6f | 40 | #include <linux/fs.h> |
e8edc6e0 | 41 | #include <linux/sched.h> |
a0762301 | 42 | #include <linux/smp_lock.h> |
1da177e4 LT |
43 | #include <asm/uaccess.h> |
44 | #include <asm/pgtable.h> | |
45 | #include "agp.h" | |
46 | ||
0316fe83 | 47 | struct agp_front_data agp_fe; |
1da177e4 | 48 | |
0316fe83 | 49 | struct agp_memory *agp_find_mem_by_key(int key) |
1da177e4 LT |
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 | ||
1da177e4 LT |
157 | static pgprot_t agp_convert_mmap_flags(int prot) |
158 | { | |
1da177e4 | 159 | unsigned long prot_bits; |
1da177e4 | 160 | |
804af2cf HD |
161 | prot_bits = calc_vm_prot_bits(prot) | VM_SHARED; |
162 | return vm_get_page_prot(prot_bits); | |
1da177e4 LT |
163 | } |
164 | ||
0316fe83 | 165 | int agp_create_segment(struct agp_client *client, struct agp_region *region) |
1da177e4 LT |
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 | ||
0ea27d9f | 172 | seg = kzalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL); |
1da177e4 LT |
173 | if (seg == NULL) { |
174 | kfree(region->seg_list); | |
175 | region->seg_list = NULL; | |
176 | return -ENOMEM; | |
177 | } | |
1da177e4 LT |
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 | ||
0316fe83 | 217 | struct agp_file_private *agp_find_private(pid_t pid) |
1da177e4 LT |
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 | ||
408b664a | 232 | static void agp_insert_file_private(struct agp_file_private * priv) |
1da177e4 LT |
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 | ||
408b664a | 244 | static void agp_remove_file_private(struct agp_file_private * priv) |
1da177e4 LT |
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 | */ | |
0316fe83 | 272 | void agp_free_memory_wrap(struct agp_memory *memory) |
1da177e4 LT |
273 | { |
274 | agp_remove_from_pool(memory); | |
275 | agp_free_memory(memory); | |
276 | } | |
277 | ||
0316fe83 | 278 | struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type) |
1da177e4 LT |
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 | ||
0ea27d9f | 314 | controller = kzalloc(sizeof(struct agp_controller), GFP_KERNEL); |
1da177e4 LT |
315 | if (controller == NULL) |
316 | return NULL; | |
317 | ||
1da177e4 | 318 | controller->pid = id; |
1da177e4 LT |
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; | |
9516b030 | 399 | agp_fe.backend_acquired = false; |
1da177e4 LT |
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; | |
9516b030 | 447 | agp_fe.used_by_controller = false; |
1da177e4 LT |
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 | ||
0316fe83 | 490 | struct agp_client *agp_find_client_by_pid(pid_t id) |
1da177e4 LT |
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 | ||
0316fe83 | 515 | struct agp_client *agp_create_client(pid_t id) |
1da177e4 LT |
516 | { |
517 | struct agp_client *new_client; | |
518 | ||
0ea27d9f | 519 | new_client = kzalloc(sizeof(struct agp_client), GFP_KERNEL); |
1da177e4 LT |
520 | if (new_client == NULL) |
521 | return NULL; | |
522 | ||
1da177e4 LT |
523 | new_client->pid = id; |
524 | agp_insert_client(new_client); | |
525 | return new_client; | |
526 | } | |
527 | ||
0316fe83 | 528 | int agp_remove_client(pid_t id) |
1da177e4 LT |
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 | ||
16867823 | 575 | mutex_lock(&(agp_fe.agp_mutex)); |
1da177e4 | 576 | |
9516b030 | 577 | if (agp_fe.backend_acquired != true) |
1da177e4 LT |
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 | } | |
16867823 | 610 | mutex_unlock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
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 | } | |
16867823 | 626 | mutex_unlock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
627 | return 0; |
628 | } | |
629 | ||
630 | out_eperm: | |
16867823 | 631 | mutex_unlock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
632 | return -EPERM; |
633 | ||
634 | out_inval: | |
16867823 | 635 | mutex_unlock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
636 | return -EINVAL; |
637 | ||
638 | out_again: | |
16867823 | 639 | mutex_unlock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
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 | ||
16867823 | 647 | mutex_lock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
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; | |
16867823 | 670 | mutex_unlock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
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 | ||
a0762301 | 681 | lock_kernel(); |
16867823 | 682 | mutex_lock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
683 | |
684 | if (minor != AGPGART_MINOR) | |
685 | goto err_out; | |
686 | ||
0ea27d9f | 687 | priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL); |
1da177e4 LT |
688 | if (priv == NULL) |
689 | goto err_out_nomem; | |
690 | ||
1da177e4 LT |
691 | set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags); |
692 | priv->my_pid = current->pid; | |
693 | ||
62f29bab | 694 | if (capable(CAP_SYS_RAWIO)) { |
1da177e4 LT |
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); | |
16867823 | 707 | mutex_unlock(&(agp_fe.agp_mutex)); |
a0762301 | 708 | unlock_kernel(); |
1da177e4 LT |
709 | return 0; |
710 | ||
711 | err_out_nomem: | |
712 | rc = -ENOMEM; | |
713 | err_out: | |
16867823 | 714 | mutex_unlock(&(agp_fe.agp_mutex)); |
a0762301 | 715 | unlock_kernel(); |
1da177e4 LT |
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 | ||
0316fe83 | 755 | int agpioc_acquire_wrap(struct agp_file_private *priv) |
1da177e4 LT |
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 | ||
6a92a4e0 | 767 | if (!agp_bridge) |
1da177e4 LT |
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 | ||
9516b030 | 775 | agp_fe.backend_acquired = true; |
1da177e4 LT |
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) { | |
9516b030 | 785 | agp_fe.backend_acquired = false; |
1da177e4 LT |
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 | ||
0316fe83 | 798 | int agpioc_release_wrap(struct agp_file_private *priv) |
1da177e4 LT |
799 | { |
800 | DBG(""); | |
801 | agp_controller_release_current(agp_fe.current_controller, priv); | |
802 | return 0; | |
803 | } | |
804 | ||
0316fe83 | 805 | int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg) |
1da177e4 LT |
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 | ||
0316fe83 | 885 | int agpioc_protect_wrap(struct agp_file_private *priv) |
1da177e4 LT |
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 | ||
a030ce44 TH |
901 | if (alloc.type >= AGP_USER_TYPES) |
902 | return -EINVAL; | |
903 | ||
1da177e4 LT |
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 | ||
0316fe83 | 919 | int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg) |
1da177e4 LT |
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 | ||
a13af4b4 DA |
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 | ||
09aa356b | 974 | static long agp_ioctl(struct file *file, |
1da177e4 LT |
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); | |
16867823 | 981 | mutex_lock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
982 | |
983 | if ((agp_fe.current_controller == NULL) && | |
984 | (cmd != AGPIOC_ACQUIRE)) { | |
985 | ret_val = -EINVAL; | |
986 | goto ioctl_out; | |
987 | } | |
9516b030 | 988 | if ((agp_fe.backend_acquired != true) && |
1da177e4 LT |
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; | |
a13af4b4 DA |
1047 | |
1048 | case AGPIOC_CHIPSET_FLUSH: | |
1049 | ret_val = agpioc_chipset_flush_wrap(curr_priv); | |
1050 | break; | |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | ioctl_out: | |
1054 | DBG("ioctl returns %d\n", ret_val); | |
16867823 | 1055 | mutex_unlock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
1056 | return ret_val; |
1057 | } | |
1058 | ||
62322d25 | 1059 | static const struct file_operations agp_fops = |
1da177e4 LT |
1060 | { |
1061 | .owner = THIS_MODULE, | |
1062 | .llseek = no_llseek, | |
1063 | .read = agp_read, | |
1064 | .write = agp_write, | |
09aa356b | 1065 | .unlocked_ioctl = agp_ioctl, |
0316fe83 ZM |
1066 | #ifdef CONFIG_COMPAT |
1067 | .compat_ioctl = compat_agp_ioctl, | |
1068 | #endif | |
1da177e4 LT |
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)); | |
16867823 | 1084 | mutex_init(&(agp_fe.agp_mutex)); |
1da177e4 LT |
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 | } |