Commit | Line | Data |
---|---|---|
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> | |
1da177e4 LT |
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> | |
4e950f6f | 39 | #include <linux/fs.h> |
e8edc6e0 | 40 | #include <linux/sched.h> |
1da177e4 LT |
41 | #include <asm/uaccess.h> |
42 | #include <asm/pgtable.h> | |
43 | #include "agp.h" | |
44 | ||
0316fe83 | 45 | struct agp_front_data agp_fe; |
1da177e4 | 46 | |
0316fe83 | 47 | struct agp_memory *agp_find_mem_by_key(int key) |
1da177e4 LT |
48 | { |
49 | struct agp_memory *curr; | |
50 | ||
51 | if (agp_fe.current_controller == NULL) | |
52 | return NULL; | |
53 | ||
54 | curr = agp_fe.current_controller->pool; | |
55 | ||
56 | while (curr != NULL) { | |
57 | if (curr->key == key) | |
58 | break; | |
59 | curr = curr->next; | |
60 | } | |
61 | ||
62 | DBG("key=%d -> mem=%p", key, curr); | |
63 | return curr; | |
64 | } | |
65 | ||
66 | static void agp_remove_from_pool(struct agp_memory *temp) | |
67 | { | |
68 | struct agp_memory *prev; | |
69 | struct agp_memory *next; | |
70 | ||
71 | /* Check to see if this is even in the memory pool */ | |
72 | ||
73 | DBG("mem=%p", temp); | |
74 | if (agp_find_mem_by_key(temp->key) != NULL) { | |
75 | next = temp->next; | |
76 | prev = temp->prev; | |
77 | ||
78 | if (prev != NULL) { | |
79 | prev->next = next; | |
80 | if (next != NULL) | |
81 | next->prev = prev; | |
82 | ||
83 | } else { | |
84 | /* This is the first item on the list */ | |
85 | if (next != NULL) | |
86 | next->prev = NULL; | |
87 | ||
88 | agp_fe.current_controller->pool = next; | |
89 | } | |
90 | } | |
91 | } | |
92 | ||
93 | /* | |
94 | * Routines for managing each client's segment list - | |
95 | * These routines handle adding and removing segments | |
96 | * to each auth'ed client. | |
97 | */ | |
98 | ||
99 | static struct | |
100 | agp_segment_priv *agp_find_seg_in_client(const struct agp_client *client, | |
101 | unsigned long offset, | |
102 | int size, pgprot_t page_prot) | |
103 | { | |
104 | struct agp_segment_priv *seg; | |
105 | int num_segments, i; | |
106 | off_t pg_start; | |
107 | size_t pg_count; | |
108 | ||
109 | pg_start = offset / 4096; | |
110 | pg_count = size / 4096; | |
111 | seg = *(client->segments); | |
112 | num_segments = client->num_segments; | |
113 | ||
114 | for (i = 0; i < client->num_segments; i++) { | |
115 | if ((seg[i].pg_start == pg_start) && | |
116 | (seg[i].pg_count == pg_count) && | |
117 | (pgprot_val(seg[i].prot) == pgprot_val(page_prot))) { | |
118 | return seg + i; | |
119 | } | |
120 | } | |
121 | ||
122 | return NULL; | |
123 | } | |
124 | ||
125 | static void agp_remove_seg_from_client(struct agp_client *client) | |
126 | { | |
127 | DBG("client=%p", client); | |
128 | ||
129 | if (client->segments != NULL) { | |
130 | if (*(client->segments) != NULL) { | |
131 | DBG("Freeing %p from client %p", *(client->segments), client); | |
132 | kfree(*(client->segments)); | |
133 | } | |
134 | DBG("Freeing %p from client %p", client->segments, client); | |
135 | kfree(client->segments); | |
136 | client->segments = NULL; | |
137 | } | |
138 | } | |
139 | ||
140 | static void agp_add_seg_to_client(struct agp_client *client, | |
141 | struct agp_segment_priv ** seg, int num_segments) | |
142 | { | |
143 | struct agp_segment_priv **prev_seg; | |
144 | ||
145 | prev_seg = client->segments; | |
146 | ||
147 | if (prev_seg != NULL) | |
148 | agp_remove_seg_from_client(client); | |
149 | ||
150 | DBG("Adding seg %p (%d segments) to client %p", seg, num_segments, client); | |
151 | client->num_segments = num_segments; | |
152 | client->segments = seg; | |
153 | } | |
154 | ||
1da177e4 LT |
155 | static pgprot_t agp_convert_mmap_flags(int prot) |
156 | { | |
1da177e4 | 157 | unsigned long prot_bits; |
1da177e4 | 158 | |
804af2cf HD |
159 | prot_bits = calc_vm_prot_bits(prot) | VM_SHARED; |
160 | return vm_get_page_prot(prot_bits); | |
1da177e4 LT |
161 | } |
162 | ||
0316fe83 | 163 | int agp_create_segment(struct agp_client *client, struct agp_region *region) |
1da177e4 LT |
164 | { |
165 | struct agp_segment_priv **ret_seg; | |
166 | struct agp_segment_priv *seg; | |
167 | struct agp_segment *user_seg; | |
168 | size_t i; | |
169 | ||
0ea27d9f | 170 | seg = kzalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL); |
1da177e4 LT |
171 | if (seg == NULL) { |
172 | kfree(region->seg_list); | |
173 | region->seg_list = NULL; | |
174 | return -ENOMEM; | |
175 | } | |
1da177e4 LT |
176 | user_seg = region->seg_list; |
177 | ||
178 | for (i = 0; i < region->seg_count; i++) { | |
179 | seg[i].pg_start = user_seg[i].pg_start; | |
180 | seg[i].pg_count = user_seg[i].pg_count; | |
181 | seg[i].prot = agp_convert_mmap_flags(user_seg[i].prot); | |
182 | } | |
183 | kfree(region->seg_list); | |
184 | region->seg_list = NULL; | |
185 | ||
186 | ret_seg = kmalloc(sizeof(void *), GFP_KERNEL); | |
187 | if (ret_seg == NULL) { | |
188 | kfree(seg); | |
189 | return -ENOMEM; | |
190 | } | |
191 | *ret_seg = seg; | |
192 | agp_add_seg_to_client(client, ret_seg, region->seg_count); | |
193 | return 0; | |
194 | } | |
195 | ||
196 | /* End - Routines for managing each client's segment list */ | |
197 | ||
198 | /* This function must only be called when current_controller != NULL */ | |
199 | static void agp_insert_into_pool(struct agp_memory * temp) | |
200 | { | |
201 | struct agp_memory *prev; | |
202 | ||
203 | prev = agp_fe.current_controller->pool; | |
204 | ||
205 | if (prev != NULL) { | |
206 | prev->prev = temp; | |
207 | temp->next = prev; | |
208 | } | |
209 | agp_fe.current_controller->pool = temp; | |
210 | } | |
211 | ||
212 | ||
213 | /* File private list routines */ | |
214 | ||
0316fe83 | 215 | struct agp_file_private *agp_find_private(pid_t pid) |
1da177e4 LT |
216 | { |
217 | struct agp_file_private *curr; | |
218 | ||
219 | curr = agp_fe.file_priv_list; | |
220 | ||
221 | while (curr != NULL) { | |
222 | if (curr->my_pid == pid) | |
223 | return curr; | |
224 | curr = curr->next; | |
225 | } | |
226 | ||
227 | return NULL; | |
228 | } | |
229 | ||
408b664a | 230 | static void agp_insert_file_private(struct agp_file_private * priv) |
1da177e4 LT |
231 | { |
232 | struct agp_file_private *prev; | |
233 | ||
234 | prev = agp_fe.file_priv_list; | |
235 | ||
236 | if (prev != NULL) | |
237 | prev->prev = priv; | |
238 | priv->next = prev; | |
239 | agp_fe.file_priv_list = priv; | |
240 | } | |
241 | ||
408b664a | 242 | static void agp_remove_file_private(struct agp_file_private * priv) |
1da177e4 LT |
243 | { |
244 | struct agp_file_private *next; | |
245 | struct agp_file_private *prev; | |
246 | ||
247 | next = priv->next; | |
248 | prev = priv->prev; | |
249 | ||
250 | if (prev != NULL) { | |
251 | prev->next = next; | |
252 | ||
253 | if (next != NULL) | |
254 | next->prev = prev; | |
255 | ||
256 | } else { | |
257 | if (next != NULL) | |
258 | next->prev = NULL; | |
259 | ||
260 | agp_fe.file_priv_list = next; | |
261 | } | |
262 | } | |
263 | ||
264 | /* End - File flag list routines */ | |
265 | ||
266 | /* | |
267 | * Wrappers for agp_free_memory & agp_allocate_memory | |
268 | * These make sure that internal lists are kept updated. | |
269 | */ | |
0316fe83 | 270 | void agp_free_memory_wrap(struct agp_memory *memory) |
1da177e4 LT |
271 | { |
272 | agp_remove_from_pool(memory); | |
273 | agp_free_memory(memory); | |
274 | } | |
275 | ||
0316fe83 | 276 | struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type) |
1da177e4 LT |
277 | { |
278 | struct agp_memory *memory; | |
279 | ||
280 | memory = agp_allocate_memory(agp_bridge, pg_count, type); | |
281 | if (memory == NULL) | |
282 | return NULL; | |
283 | ||
284 | agp_insert_into_pool(memory); | |
285 | return memory; | |
286 | } | |
287 | ||
288 | /* Routines for managing the list of controllers - | |
289 | * These routines manage the current controller, and the list of | |
290 | * controllers | |
291 | */ | |
292 | ||
293 | static struct agp_controller *agp_find_controller_by_pid(pid_t id) | |
294 | { | |
295 | struct agp_controller *controller; | |
296 | ||
297 | controller = agp_fe.controllers; | |
298 | ||
299 | while (controller != NULL) { | |
300 | if (controller->pid == id) | |
301 | return controller; | |
302 | controller = controller->next; | |
303 | } | |
304 | ||
305 | return NULL; | |
306 | } | |
307 | ||
308 | static struct agp_controller *agp_create_controller(pid_t id) | |
309 | { | |
310 | struct agp_controller *controller; | |
311 | ||
0ea27d9f | 312 | controller = kzalloc(sizeof(struct agp_controller), GFP_KERNEL); |
1da177e4 LT |
313 | if (controller == NULL) |
314 | return NULL; | |
315 | ||
1da177e4 | 316 | controller->pid = id; |
1da177e4 LT |
317 | return controller; |
318 | } | |
319 | ||
320 | static int agp_insert_controller(struct agp_controller *controller) | |
321 | { | |
322 | struct agp_controller *prev_controller; | |
323 | ||
324 | prev_controller = agp_fe.controllers; | |
325 | controller->next = prev_controller; | |
326 | ||
327 | if (prev_controller != NULL) | |
328 | prev_controller->prev = controller; | |
329 | ||
330 | agp_fe.controllers = controller; | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | static void agp_remove_all_clients(struct agp_controller *controller) | |
336 | { | |
337 | struct agp_client *client; | |
338 | struct agp_client *temp; | |
339 | ||
340 | client = controller->clients; | |
341 | ||
342 | while (client) { | |
343 | struct agp_file_private *priv; | |
344 | ||
345 | temp = client; | |
346 | agp_remove_seg_from_client(temp); | |
347 | priv = agp_find_private(temp->pid); | |
348 | ||
349 | if (priv != NULL) { | |
350 | clear_bit(AGP_FF_IS_VALID, &priv->access_flags); | |
351 | clear_bit(AGP_FF_IS_CLIENT, &priv->access_flags); | |
352 | } | |
353 | client = client->next; | |
354 | kfree(temp); | |
355 | } | |
356 | } | |
357 | ||
358 | static void agp_remove_all_memory(struct agp_controller *controller) | |
359 | { | |
360 | struct agp_memory *memory; | |
361 | struct agp_memory *temp; | |
362 | ||
363 | memory = controller->pool; | |
364 | ||
365 | while (memory) { | |
366 | temp = memory; | |
367 | memory = memory->next; | |
368 | agp_free_memory_wrap(temp); | |
369 | } | |
370 | } | |
371 | ||
372 | static int agp_remove_controller(struct agp_controller *controller) | |
373 | { | |
374 | struct agp_controller *prev_controller; | |
375 | struct agp_controller *next_controller; | |
376 | ||
377 | prev_controller = controller->prev; | |
378 | next_controller = controller->next; | |
379 | ||
380 | if (prev_controller != NULL) { | |
381 | prev_controller->next = next_controller; | |
382 | if (next_controller != NULL) | |
383 | next_controller->prev = prev_controller; | |
384 | ||
385 | } else { | |
386 | if (next_controller != NULL) | |
387 | next_controller->prev = NULL; | |
388 | ||
389 | agp_fe.controllers = next_controller; | |
390 | } | |
391 | ||
392 | agp_remove_all_memory(controller); | |
393 | agp_remove_all_clients(controller); | |
394 | ||
395 | if (agp_fe.current_controller == controller) { | |
396 | agp_fe.current_controller = NULL; | |
9516b030 | 397 | agp_fe.backend_acquired = false; |
1da177e4 LT |
398 | agp_backend_release(agp_bridge); |
399 | } | |
400 | kfree(controller); | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static void agp_controller_make_current(struct agp_controller *controller) | |
405 | { | |
406 | struct agp_client *clients; | |
407 | ||
408 | clients = controller->clients; | |
409 | ||
410 | while (clients != NULL) { | |
411 | struct agp_file_private *priv; | |
412 | ||
413 | priv = agp_find_private(clients->pid); | |
414 | ||
415 | if (priv != NULL) { | |
416 | set_bit(AGP_FF_IS_VALID, &priv->access_flags); | |
417 | set_bit(AGP_FF_IS_CLIENT, &priv->access_flags); | |
418 | } | |
419 | clients = clients->next; | |
420 | } | |
421 | ||
422 | agp_fe.current_controller = controller; | |
423 | } | |
424 | ||
425 | static void agp_controller_release_current(struct agp_controller *controller, | |
426 | struct agp_file_private *controller_priv) | |
427 | { | |
428 | struct agp_client *clients; | |
429 | ||
430 | clear_bit(AGP_FF_IS_VALID, &controller_priv->access_flags); | |
431 | clients = controller->clients; | |
432 | ||
433 | while (clients != NULL) { | |
434 | struct agp_file_private *priv; | |
435 | ||
436 | priv = agp_find_private(clients->pid); | |
437 | ||
438 | if (priv != NULL) | |
439 | clear_bit(AGP_FF_IS_VALID, &priv->access_flags); | |
440 | ||
441 | clients = clients->next; | |
442 | } | |
443 | ||
444 | agp_fe.current_controller = NULL; | |
9516b030 | 445 | agp_fe.used_by_controller = false; |
1da177e4 LT |
446 | agp_backend_release(agp_bridge); |
447 | } | |
448 | ||
449 | /* | |
450 | * Routines for managing client lists - | |
451 | * These routines are for managing the list of auth'ed clients. | |
452 | */ | |
453 | ||
454 | static struct agp_client | |
455 | *agp_find_client_in_controller(struct agp_controller *controller, pid_t id) | |
456 | { | |
457 | struct agp_client *client; | |
458 | ||
459 | if (controller == NULL) | |
460 | return NULL; | |
461 | ||
462 | client = controller->clients; | |
463 | ||
464 | while (client != NULL) { | |
465 | if (client->pid == id) | |
466 | return client; | |
467 | client = client->next; | |
468 | } | |
469 | ||
470 | return NULL; | |
471 | } | |
472 | ||
473 | static struct agp_controller *agp_find_controller_for_client(pid_t id) | |
474 | { | |
475 | struct agp_controller *controller; | |
476 | ||
477 | controller = agp_fe.controllers; | |
478 | ||
479 | while (controller != NULL) { | |
480 | if ((agp_find_client_in_controller(controller, id)) != NULL) | |
481 | return controller; | |
482 | controller = controller->next; | |
483 | } | |
484 | ||
485 | return NULL; | |
486 | } | |
487 | ||
0316fe83 | 488 | struct agp_client *agp_find_client_by_pid(pid_t id) |
1da177e4 LT |
489 | { |
490 | struct agp_client *temp; | |
491 | ||
492 | if (agp_fe.current_controller == NULL) | |
493 | return NULL; | |
494 | ||
495 | temp = agp_find_client_in_controller(agp_fe.current_controller, id); | |
496 | return temp; | |
497 | } | |
498 | ||
499 | static void agp_insert_client(struct agp_client *client) | |
500 | { | |
501 | struct agp_client *prev_client; | |
502 | ||
503 | prev_client = agp_fe.current_controller->clients; | |
504 | client->next = prev_client; | |
505 | ||
506 | if (prev_client != NULL) | |
507 | prev_client->prev = client; | |
508 | ||
509 | agp_fe.current_controller->clients = client; | |
510 | agp_fe.current_controller->num_clients++; | |
511 | } | |
512 | ||
0316fe83 | 513 | struct agp_client *agp_create_client(pid_t id) |
1da177e4 LT |
514 | { |
515 | struct agp_client *new_client; | |
516 | ||
0ea27d9f | 517 | new_client = kzalloc(sizeof(struct agp_client), GFP_KERNEL); |
1da177e4 LT |
518 | if (new_client == NULL) |
519 | return NULL; | |
520 | ||
1da177e4 LT |
521 | new_client->pid = id; |
522 | agp_insert_client(new_client); | |
523 | return new_client; | |
524 | } | |
525 | ||
0316fe83 | 526 | int agp_remove_client(pid_t id) |
1da177e4 LT |
527 | { |
528 | struct agp_client *client; | |
529 | struct agp_client *prev_client; | |
530 | struct agp_client *next_client; | |
531 | struct agp_controller *controller; | |
532 | ||
533 | controller = agp_find_controller_for_client(id); | |
534 | if (controller == NULL) | |
535 | return -EINVAL; | |
536 | ||
537 | client = agp_find_client_in_controller(controller, id); | |
538 | if (client == NULL) | |
539 | return -EINVAL; | |
540 | ||
541 | prev_client = client->prev; | |
542 | next_client = client->next; | |
543 | ||
544 | if (prev_client != NULL) { | |
545 | prev_client->next = next_client; | |
546 | if (next_client != NULL) | |
547 | next_client->prev = prev_client; | |
548 | ||
549 | } else { | |
550 | if (next_client != NULL) | |
551 | next_client->prev = NULL; | |
552 | controller->clients = next_client; | |
553 | } | |
554 | ||
555 | controller->num_clients--; | |
556 | agp_remove_seg_from_client(client); | |
557 | kfree(client); | |
558 | return 0; | |
559 | } | |
560 | ||
561 | /* End - Routines for managing client lists */ | |
562 | ||
563 | /* File Operations */ | |
564 | ||
565 | static int agp_mmap(struct file *file, struct vm_area_struct *vma) | |
566 | { | |
567 | unsigned int size, current_size; | |
568 | unsigned long offset; | |
569 | struct agp_client *client; | |
570 | struct agp_file_private *priv = file->private_data; | |
571 | struct agp_kern_info kerninfo; | |
572 | ||
16867823 | 573 | mutex_lock(&(agp_fe.agp_mutex)); |
1da177e4 | 574 | |
9516b030 | 575 | if (agp_fe.backend_acquired != true) |
1da177e4 LT |
576 | goto out_eperm; |
577 | ||
578 | if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags))) | |
579 | goto out_eperm; | |
580 | ||
581 | agp_copy_info(agp_bridge, &kerninfo); | |
582 | size = vma->vm_end - vma->vm_start; | |
583 | current_size = kerninfo.aper_size; | |
584 | current_size = current_size * 0x100000; | |
585 | offset = vma->vm_pgoff << PAGE_SHIFT; | |
586 | DBG("%lx:%lx", offset, offset+size); | |
587 | ||
588 | if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) { | |
589 | if ((size + offset) > current_size) | |
590 | goto out_inval; | |
591 | ||
592 | client = agp_find_client_by_pid(current->pid); | |
593 | ||
594 | if (client == NULL) | |
595 | goto out_eperm; | |
596 | ||
597 | if (!agp_find_seg_in_client(client, offset, size, vma->vm_page_prot)) | |
598 | goto out_inval; | |
599 | ||
600 | DBG("client vm_ops=%p", kerninfo.vm_ops); | |
601 | if (kerninfo.vm_ops) { | |
602 | vma->vm_ops = kerninfo.vm_ops; | |
603 | } else if (io_remap_pfn_range(vma, vma->vm_start, | |
604 | (kerninfo.aper_base + offset) >> PAGE_SHIFT, | |
f435046d AL |
605 | size, |
606 | pgprot_writecombine(vma->vm_page_prot))) { | |
1da177e4 LT |
607 | goto out_again; |
608 | } | |
16867823 | 609 | mutex_unlock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
610 | return 0; |
611 | } | |
612 | ||
613 | if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) { | |
614 | if (size != current_size) | |
615 | goto out_inval; | |
616 | ||
617 | DBG("controller vm_ops=%p", kerninfo.vm_ops); | |
618 | if (kerninfo.vm_ops) { | |
619 | vma->vm_ops = kerninfo.vm_ops; | |
620 | } else if (io_remap_pfn_range(vma, vma->vm_start, | |
f435046d AL |
621 | kerninfo.aper_base >> PAGE_SHIFT, |
622 | size, | |
623 | pgprot_writecombine(vma->vm_page_prot))) { | |
1da177e4 LT |
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; | |
1da177e4 LT |
679 | |
680 | if (minor != AGPGART_MINOR) | |
55e858c8 JK |
681 | return -ENXIO; |
682 | ||
683 | mutex_lock(&(agp_fe.agp_mutex)); | |
1da177e4 | 684 | |
0ea27d9f | 685 | priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL); |
55e858c8 JK |
686 | if (priv == NULL) { |
687 | mutex_unlock(&(agp_fe.agp_mutex)); | |
688 | return -ENOMEM; | |
689 | } | |
1da177e4 | 690 | |
1da177e4 LT |
691 | set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags); |
692 | priv->my_pid = current->pid; | |
693 | ||
55e858c8 | 694 | if (capable(CAP_SYS_RAWIO)) |
1da177e4 LT |
695 | /* Root priv, can be controller */ |
696 | set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags); | |
55e858c8 | 697 | |
1da177e4 LT |
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); | |
1da177e4 | 707 | |
16867823 | 708 | mutex_unlock(&(agp_fe.agp_mutex)); |
55e858c8 JK |
709 | |
710 | return 0; | |
1da177e4 LT |
711 | } |
712 | ||
713 | ||
714 | static ssize_t agp_read(struct file *file, char __user *buf, | |
715 | size_t count, loff_t * ppos) | |
716 | { | |
717 | return -EINVAL; | |
718 | } | |
719 | ||
720 | static ssize_t agp_write(struct file *file, const char __user *buf, | |
721 | size_t count, loff_t * ppos) | |
722 | { | |
723 | return -EINVAL; | |
724 | } | |
725 | ||
726 | static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg) | |
727 | { | |
728 | struct agp_info userinfo; | |
729 | struct agp_kern_info kerninfo; | |
730 | ||
731 | agp_copy_info(agp_bridge, &kerninfo); | |
732 | ||
733 | userinfo.version.major = kerninfo.version.major; | |
734 | userinfo.version.minor = kerninfo.version.minor; | |
735 | userinfo.bridge_id = kerninfo.device->vendor | | |
736 | (kerninfo.device->device << 16); | |
737 | userinfo.agp_mode = kerninfo.mode; | |
738 | userinfo.aper_base = kerninfo.aper_base; | |
739 | userinfo.aper_size = kerninfo.aper_size; | |
740 | userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory; | |
741 | userinfo.pg_used = kerninfo.current_memory; | |
742 | ||
743 | if (copy_to_user(arg, &userinfo, sizeof(struct agp_info))) | |
744 | return -EFAULT; | |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
0316fe83 | 749 | int agpioc_acquire_wrap(struct agp_file_private *priv) |
1da177e4 LT |
750 | { |
751 | struct agp_controller *controller; | |
752 | ||
753 | DBG(""); | |
754 | ||
755 | if (!(test_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags))) | |
756 | return -EPERM; | |
757 | ||
758 | if (agp_fe.current_controller != NULL) | |
759 | return -EBUSY; | |
760 | ||
6a92a4e0 | 761 | if (!agp_bridge) |
1da177e4 LT |
762 | return -ENODEV; |
763 | ||
764 | if (atomic_read(&agp_bridge->agp_in_use)) | |
765 | return -EBUSY; | |
766 | ||
767 | atomic_inc(&agp_bridge->agp_in_use); | |
768 | ||
9516b030 | 769 | agp_fe.backend_acquired = true; |
1da177e4 LT |
770 | |
771 | controller = agp_find_controller_by_pid(priv->my_pid); | |
772 | ||
773 | if (controller != NULL) { | |
774 | agp_controller_make_current(controller); | |
775 | } else { | |
776 | controller = agp_create_controller(priv->my_pid); | |
777 | ||
778 | if (controller == NULL) { | |
9516b030 | 779 | agp_fe.backend_acquired = false; |
1da177e4 LT |
780 | agp_backend_release(agp_bridge); |
781 | return -ENOMEM; | |
782 | } | |
783 | agp_insert_controller(controller); | |
784 | agp_controller_make_current(controller); | |
785 | } | |
786 | ||
787 | set_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags); | |
788 | set_bit(AGP_FF_IS_VALID, &priv->access_flags); | |
789 | return 0; | |
790 | } | |
791 | ||
0316fe83 | 792 | int agpioc_release_wrap(struct agp_file_private *priv) |
1da177e4 LT |
793 | { |
794 | DBG(""); | |
795 | agp_controller_release_current(agp_fe.current_controller, priv); | |
796 | return 0; | |
797 | } | |
798 | ||
0316fe83 | 799 | int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg) |
1da177e4 LT |
800 | { |
801 | struct agp_setup mode; | |
802 | ||
803 | DBG(""); | |
804 | if (copy_from_user(&mode, arg, sizeof(struct agp_setup))) | |
805 | return -EFAULT; | |
806 | ||
807 | agp_enable(agp_bridge, mode.agp_mode); | |
808 | return 0; | |
809 | } | |
810 | ||
811 | static int agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg) | |
812 | { | |
813 | struct agp_region reserve; | |
814 | struct agp_client *client; | |
815 | struct agp_file_private *client_priv; | |
816 | ||
817 | DBG(""); | |
818 | if (copy_from_user(&reserve, arg, sizeof(struct agp_region))) | |
819 | return -EFAULT; | |
820 | ||
821 | if ((unsigned) reserve.seg_count >= ~0U/sizeof(struct agp_segment)) | |
822 | return -EFAULT; | |
823 | ||
824 | client = agp_find_client_by_pid(reserve.pid); | |
825 | ||
826 | if (reserve.seg_count == 0) { | |
827 | /* remove a client */ | |
828 | client_priv = agp_find_private(reserve.pid); | |
829 | ||
830 | if (client_priv != NULL) { | |
831 | set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags); | |
832 | set_bit(AGP_FF_IS_VALID, &client_priv->access_flags); | |
833 | } | |
834 | if (client == NULL) { | |
835 | /* client is already removed */ | |
836 | return 0; | |
837 | } | |
838 | return agp_remove_client(reserve.pid); | |
839 | } else { | |
840 | struct agp_segment *segment; | |
841 | ||
842 | if (reserve.seg_count >= 16384) | |
843 | return -EINVAL; | |
844 | ||
845 | segment = kmalloc((sizeof(struct agp_segment) * reserve.seg_count), | |
846 | GFP_KERNEL); | |
847 | ||
848 | if (segment == NULL) | |
849 | return -ENOMEM; | |
850 | ||
851 | if (copy_from_user(segment, (void __user *) reserve.seg_list, | |
852 | sizeof(struct agp_segment) * reserve.seg_count)) { | |
853 | kfree(segment); | |
854 | return -EFAULT; | |
855 | } | |
856 | reserve.seg_list = segment; | |
857 | ||
858 | if (client == NULL) { | |
859 | /* Create the client and add the segment */ | |
860 | client = agp_create_client(reserve.pid); | |
861 | ||
862 | if (client == NULL) { | |
863 | kfree(segment); | |
864 | return -ENOMEM; | |
865 | } | |
866 | client_priv = agp_find_private(reserve.pid); | |
867 | ||
868 | if (client_priv != NULL) { | |
869 | set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags); | |
870 | set_bit(AGP_FF_IS_VALID, &client_priv->access_flags); | |
871 | } | |
872 | } | |
873 | return agp_create_segment(client, &reserve); | |
874 | } | |
875 | /* Will never really happen */ | |
876 | return -EINVAL; | |
877 | } | |
878 | ||
0316fe83 | 879 | int agpioc_protect_wrap(struct agp_file_private *priv) |
1da177e4 LT |
880 | { |
881 | DBG(""); | |
882 | /* This function is not currently implemented */ | |
883 | return -EINVAL; | |
884 | } | |
885 | ||
886 | static int agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg) | |
887 | { | |
888 | struct agp_memory *memory; | |
889 | struct agp_allocate alloc; | |
890 | ||
891 | DBG(""); | |
892 | if (copy_from_user(&alloc, arg, sizeof(struct agp_allocate))) | |
893 | return -EFAULT; | |
894 | ||
a030ce44 TH |
895 | if (alloc.type >= AGP_USER_TYPES) |
896 | return -EINVAL; | |
897 | ||
1da177e4 LT |
898 | memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type); |
899 | ||
900 | if (memory == NULL) | |
901 | return -ENOMEM; | |
902 | ||
903 | alloc.key = memory->key; | |
904 | alloc.physical = memory->physical; | |
905 | ||
906 | if (copy_to_user(arg, &alloc, sizeof(struct agp_allocate))) { | |
907 | agp_free_memory_wrap(memory); | |
908 | return -EFAULT; | |
909 | } | |
910 | return 0; | |
911 | } | |
912 | ||
0316fe83 | 913 | int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg) |
1da177e4 LT |
914 | { |
915 | struct agp_memory *memory; | |
916 | ||
917 | DBG(""); | |
918 | memory = agp_find_mem_by_key(arg); | |
919 | ||
920 | if (memory == NULL) | |
921 | return -EINVAL; | |
922 | ||
923 | agp_free_memory_wrap(memory); | |
924 | return 0; | |
925 | } | |
926 | ||
927 | static int agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg) | |
928 | { | |
929 | struct agp_bind bind_info; | |
930 | struct agp_memory *memory; | |
931 | ||
932 | DBG(""); | |
933 | if (copy_from_user(&bind_info, arg, sizeof(struct agp_bind))) | |
934 | return -EFAULT; | |
935 | ||
936 | memory = agp_find_mem_by_key(bind_info.key); | |
937 | ||
938 | if (memory == NULL) | |
939 | return -EINVAL; | |
940 | ||
941 | return agp_bind_memory(memory, bind_info.pg_start); | |
942 | } | |
943 | ||
944 | static int agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg) | |
945 | { | |
946 | struct agp_memory *memory; | |
947 | struct agp_unbind unbind; | |
948 | ||
949 | DBG(""); | |
950 | if (copy_from_user(&unbind, arg, sizeof(struct agp_unbind))) | |
951 | return -EFAULT; | |
952 | ||
953 | memory = agp_find_mem_by_key(unbind.key); | |
954 | ||
955 | if (memory == NULL) | |
956 | return -EINVAL; | |
957 | ||
958 | return agp_unbind_memory(memory); | |
959 | } | |
960 | ||
09aa356b | 961 | static long agp_ioctl(struct file *file, |
1da177e4 LT |
962 | unsigned int cmd, unsigned long arg) |
963 | { | |
964 | struct agp_file_private *curr_priv = file->private_data; | |
965 | int ret_val = -ENOTTY; | |
966 | ||
967 | DBG("priv=%p, cmd=%x", curr_priv, cmd); | |
16867823 | 968 | mutex_lock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
969 | |
970 | if ((agp_fe.current_controller == NULL) && | |
971 | (cmd != AGPIOC_ACQUIRE)) { | |
972 | ret_val = -EINVAL; | |
973 | goto ioctl_out; | |
974 | } | |
9516b030 | 975 | if ((agp_fe.backend_acquired != true) && |
1da177e4 LT |
976 | (cmd != AGPIOC_ACQUIRE)) { |
977 | ret_val = -EBUSY; | |
978 | goto ioctl_out; | |
979 | } | |
980 | if (cmd != AGPIOC_ACQUIRE) { | |
981 | if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) { | |
982 | ret_val = -EPERM; | |
983 | goto ioctl_out; | |
984 | } | |
985 | /* Use the original pid of the controller, | |
986 | * in case it's threaded */ | |
987 | ||
988 | if (agp_fe.current_controller->pid != curr_priv->my_pid) { | |
989 | ret_val = -EBUSY; | |
990 | goto ioctl_out; | |
991 | } | |
992 | } | |
993 | ||
994 | switch (cmd) { | |
995 | case AGPIOC_INFO: | |
996 | ret_val = agpioc_info_wrap(curr_priv, (void __user *) arg); | |
997 | break; | |
998 | ||
999 | case AGPIOC_ACQUIRE: | |
1000 | ret_val = agpioc_acquire_wrap(curr_priv); | |
1001 | break; | |
1002 | ||
1003 | case AGPIOC_RELEASE: | |
1004 | ret_val = agpioc_release_wrap(curr_priv); | |
1005 | break; | |
1006 | ||
1007 | case AGPIOC_SETUP: | |
1008 | ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg); | |
1009 | break; | |
1010 | ||
1011 | case AGPIOC_RESERVE: | |
1012 | ret_val = agpioc_reserve_wrap(curr_priv, (void __user *) arg); | |
1013 | break; | |
1014 | ||
1015 | case AGPIOC_PROTECT: | |
1016 | ret_val = agpioc_protect_wrap(curr_priv); | |
1017 | break; | |
1018 | ||
1019 | case AGPIOC_ALLOCATE: | |
1020 | ret_val = agpioc_allocate_wrap(curr_priv, (void __user *) arg); | |
1021 | break; | |
1022 | ||
1023 | case AGPIOC_DEALLOCATE: | |
1024 | ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg); | |
1025 | break; | |
1026 | ||
1027 | case AGPIOC_BIND: | |
1028 | ret_val = agpioc_bind_wrap(curr_priv, (void __user *) arg); | |
1029 | break; | |
1030 | ||
1031 | case AGPIOC_UNBIND: | |
1032 | ret_val = agpioc_unbind_wrap(curr_priv, (void __user *) arg); | |
1033 | break; | |
a13af4b4 DA |
1034 | |
1035 | case AGPIOC_CHIPSET_FLUSH: | |
a13af4b4 | 1036 | break; |
1da177e4 LT |
1037 | } |
1038 | ||
1039 | ioctl_out: | |
1040 | DBG("ioctl returns %d\n", ret_val); | |
16867823 | 1041 | mutex_unlock(&(agp_fe.agp_mutex)); |
1da177e4 LT |
1042 | return ret_val; |
1043 | } | |
1044 | ||
62322d25 | 1045 | static const struct file_operations agp_fops = |
1da177e4 LT |
1046 | { |
1047 | .owner = THIS_MODULE, | |
1048 | .llseek = no_llseek, | |
1049 | .read = agp_read, | |
1050 | .write = agp_write, | |
09aa356b | 1051 | .unlocked_ioctl = agp_ioctl, |
0316fe83 ZM |
1052 | #ifdef CONFIG_COMPAT |
1053 | .compat_ioctl = compat_agp_ioctl, | |
1054 | #endif | |
1da177e4 LT |
1055 | .mmap = agp_mmap, |
1056 | .open = agp_open, | |
1057 | .release = agp_release, | |
1058 | }; | |
1059 | ||
1060 | static struct miscdevice agp_miscdev = | |
1061 | { | |
1062 | .minor = AGPGART_MINOR, | |
1063 | .name = "agpgart", | |
1064 | .fops = &agp_fops | |
1065 | }; | |
1066 | ||
1067 | int agp_frontend_initialize(void) | |
1068 | { | |
1069 | memset(&agp_fe, 0, sizeof(struct agp_front_data)); | |
16867823 | 1070 | mutex_init(&(agp_fe.agp_mutex)); |
1da177e4 LT |
1071 | |
1072 | if (misc_register(&agp_miscdev)) { | |
1073 | printk(KERN_ERR PFX "unable to get minor: %d\n", AGPGART_MINOR); | |
1074 | return -EIO; | |
1075 | } | |
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | void agp_frontend_cleanup(void) | |
1080 | { | |
1081 | misc_deregister(&agp_miscdev); | |
1082 | } |