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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> | |
40 | #include <asm/uaccess.h> | |
41 | #include <asm/pgtable.h> | |
42 | #include "agp.h" | |
43 | ||
44 | static struct agp_front_data agp_fe; | |
45 | ||
46 | static struct agp_memory *agp_find_mem_by_key(int key) | |
47 | { | |
48 | struct agp_memory *curr; | |
49 | ||
50 | if (agp_fe.current_controller == NULL) | |
51 | return NULL; | |
52 | ||
53 | curr = agp_fe.current_controller->pool; | |
54 | ||
55 | while (curr != NULL) { | |
56 | if (curr->key == key) | |
57 | break; | |
58 | curr = curr->next; | |
59 | } | |
60 | ||
61 | DBG("key=%d -> mem=%p", key, curr); | |
62 | return curr; | |
63 | } | |
64 | ||
65 | static void agp_remove_from_pool(struct agp_memory *temp) | |
66 | { | |
67 | struct agp_memory *prev; | |
68 | struct agp_memory *next; | |
69 | ||
70 | /* Check to see if this is even in the memory pool */ | |
71 | ||
72 | DBG("mem=%p", temp); | |
73 | if (agp_find_mem_by_key(temp->key) != NULL) { | |
74 | next = temp->next; | |
75 | prev = temp->prev; | |
76 | ||
77 | if (prev != NULL) { | |
78 | prev->next = next; | |
79 | if (next != NULL) | |
80 | next->prev = prev; | |
81 | ||
82 | } else { | |
83 | /* This is the first item on the list */ | |
84 | if (next != NULL) | |
85 | next->prev = NULL; | |
86 | ||
87 | agp_fe.current_controller->pool = next; | |
88 | } | |
89 | } | |
90 | } | |
91 | ||
92 | /* | |
93 | * Routines for managing each client's segment list - | |
94 | * These routines handle adding and removing segments | |
95 | * to each auth'ed client. | |
96 | */ | |
97 | ||
98 | static struct | |
99 | agp_segment_priv *agp_find_seg_in_client(const struct agp_client *client, | |
100 | unsigned long offset, | |
101 | int size, pgprot_t page_prot) | |
102 | { | |
103 | struct agp_segment_priv *seg; | |
104 | int num_segments, i; | |
105 | off_t pg_start; | |
106 | size_t pg_count; | |
107 | ||
108 | pg_start = offset / 4096; | |
109 | pg_count = size / 4096; | |
110 | seg = *(client->segments); | |
111 | num_segments = client->num_segments; | |
112 | ||
113 | for (i = 0; i < client->num_segments; i++) { | |
114 | if ((seg[i].pg_start == pg_start) && | |
115 | (seg[i].pg_count == pg_count) && | |
116 | (pgprot_val(seg[i].prot) == pgprot_val(page_prot))) { | |
117 | return seg + i; | |
118 | } | |
119 | } | |
120 | ||
121 | return NULL; | |
122 | } | |
123 | ||
124 | static void agp_remove_seg_from_client(struct agp_client *client) | |
125 | { | |
126 | DBG("client=%p", client); | |
127 | ||
128 | if (client->segments != NULL) { | |
129 | if (*(client->segments) != NULL) { | |
130 | DBG("Freeing %p from client %p", *(client->segments), client); | |
131 | kfree(*(client->segments)); | |
132 | } | |
133 | DBG("Freeing %p from client %p", client->segments, client); | |
134 | kfree(client->segments); | |
135 | client->segments = NULL; | |
136 | } | |
137 | } | |
138 | ||
139 | static void agp_add_seg_to_client(struct agp_client *client, | |
140 | struct agp_segment_priv ** seg, int num_segments) | |
141 | { | |
142 | struct agp_segment_priv **prev_seg; | |
143 | ||
144 | prev_seg = client->segments; | |
145 | ||
146 | if (prev_seg != NULL) | |
147 | agp_remove_seg_from_client(client); | |
148 | ||
149 | DBG("Adding seg %p (%d segments) to client %p", seg, num_segments, client); | |
150 | client->num_segments = num_segments; | |
151 | client->segments = seg; | |
152 | } | |
153 | ||
154 | /* Originally taken from linux/mm/mmap.c from the array | |
155 | * protection_map. | |
156 | * The original really should be exported to modules, or | |
157 | * some routine which does the conversion for you | |
158 | */ | |
159 | ||
160 | static const pgprot_t my_protect_map[16] = | |
161 | { | |
162 | __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111, | |
163 | __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111 | |
164 | }; | |
165 | ||
166 | static pgprot_t agp_convert_mmap_flags(int prot) | |
167 | { | |
168 | #define _trans(x,bit1,bit2) \ | |
169 | ((bit1==bit2)?(x&bit1):(x&bit1)?bit2:0) | |
170 | ||
171 | unsigned long prot_bits; | |
172 | pgprot_t temp; | |
173 | ||
174 | prot_bits = _trans(prot, PROT_READ, VM_READ) | | |
175 | _trans(prot, PROT_WRITE, VM_WRITE) | | |
176 | _trans(prot, PROT_EXEC, VM_EXEC); | |
177 | ||
178 | prot_bits |= VM_SHARED; | |
179 | ||
180 | temp = my_protect_map[prot_bits & 0x0000000f]; | |
181 | ||
182 | return temp; | |
183 | } | |
184 | ||
185 | static int agp_create_segment(struct agp_client *client, struct agp_region *region) | |
186 | { | |
187 | struct agp_segment_priv **ret_seg; | |
188 | struct agp_segment_priv *seg; | |
189 | struct agp_segment *user_seg; | |
190 | size_t i; | |
191 | ||
192 | seg = kmalloc((sizeof(struct agp_segment_priv) * region->seg_count), GFP_KERNEL); | |
193 | if (seg == NULL) { | |
194 | kfree(region->seg_list); | |
195 | region->seg_list = NULL; | |
196 | return -ENOMEM; | |
197 | } | |
198 | memset(seg, 0, (sizeof(struct agp_segment_priv) * region->seg_count)); | |
199 | user_seg = region->seg_list; | |
200 | ||
201 | for (i = 0; i < region->seg_count; i++) { | |
202 | seg[i].pg_start = user_seg[i].pg_start; | |
203 | seg[i].pg_count = user_seg[i].pg_count; | |
204 | seg[i].prot = agp_convert_mmap_flags(user_seg[i].prot); | |
205 | } | |
206 | kfree(region->seg_list); | |
207 | region->seg_list = NULL; | |
208 | ||
209 | ret_seg = kmalloc(sizeof(void *), GFP_KERNEL); | |
210 | if (ret_seg == NULL) { | |
211 | kfree(seg); | |
212 | return -ENOMEM; | |
213 | } | |
214 | *ret_seg = seg; | |
215 | agp_add_seg_to_client(client, ret_seg, region->seg_count); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | /* End - Routines for managing each client's segment list */ | |
220 | ||
221 | /* This function must only be called when current_controller != NULL */ | |
222 | static void agp_insert_into_pool(struct agp_memory * temp) | |
223 | { | |
224 | struct agp_memory *prev; | |
225 | ||
226 | prev = agp_fe.current_controller->pool; | |
227 | ||
228 | if (prev != NULL) { | |
229 | prev->prev = temp; | |
230 | temp->next = prev; | |
231 | } | |
232 | agp_fe.current_controller->pool = temp; | |
233 | } | |
234 | ||
235 | ||
236 | /* File private list routines */ | |
237 | ||
408b664a | 238 | static struct agp_file_private *agp_find_private(pid_t pid) |
1da177e4 LT |
239 | { |
240 | struct agp_file_private *curr; | |
241 | ||
242 | curr = agp_fe.file_priv_list; | |
243 | ||
244 | while (curr != NULL) { | |
245 | if (curr->my_pid == pid) | |
246 | return curr; | |
247 | curr = curr->next; | |
248 | } | |
249 | ||
250 | return NULL; | |
251 | } | |
252 | ||
408b664a | 253 | static void agp_insert_file_private(struct agp_file_private * priv) |
1da177e4 LT |
254 | { |
255 | struct agp_file_private *prev; | |
256 | ||
257 | prev = agp_fe.file_priv_list; | |
258 | ||
259 | if (prev != NULL) | |
260 | prev->prev = priv; | |
261 | priv->next = prev; | |
262 | agp_fe.file_priv_list = priv; | |
263 | } | |
264 | ||
408b664a | 265 | static void agp_remove_file_private(struct agp_file_private * priv) |
1da177e4 LT |
266 | { |
267 | struct agp_file_private *next; | |
268 | struct agp_file_private *prev; | |
269 | ||
270 | next = priv->next; | |
271 | prev = priv->prev; | |
272 | ||
273 | if (prev != NULL) { | |
274 | prev->next = next; | |
275 | ||
276 | if (next != NULL) | |
277 | next->prev = prev; | |
278 | ||
279 | } else { | |
280 | if (next != NULL) | |
281 | next->prev = NULL; | |
282 | ||
283 | agp_fe.file_priv_list = next; | |
284 | } | |
285 | } | |
286 | ||
287 | /* End - File flag list routines */ | |
288 | ||
289 | /* | |
290 | * Wrappers for agp_free_memory & agp_allocate_memory | |
291 | * These make sure that internal lists are kept updated. | |
292 | */ | |
293 | static void agp_free_memory_wrap(struct agp_memory *memory) | |
294 | { | |
295 | agp_remove_from_pool(memory); | |
296 | agp_free_memory(memory); | |
297 | } | |
298 | ||
299 | static struct agp_memory *agp_allocate_memory_wrap(size_t pg_count, u32 type) | |
300 | { | |
301 | struct agp_memory *memory; | |
302 | ||
303 | memory = agp_allocate_memory(agp_bridge, pg_count, type); | |
304 | if (memory == NULL) | |
305 | return NULL; | |
306 | ||
307 | agp_insert_into_pool(memory); | |
308 | return memory; | |
309 | } | |
310 | ||
311 | /* Routines for managing the list of controllers - | |
312 | * These routines manage the current controller, and the list of | |
313 | * controllers | |
314 | */ | |
315 | ||
316 | static struct agp_controller *agp_find_controller_by_pid(pid_t id) | |
317 | { | |
318 | struct agp_controller *controller; | |
319 | ||
320 | controller = agp_fe.controllers; | |
321 | ||
322 | while (controller != NULL) { | |
323 | if (controller->pid == id) | |
324 | return controller; | |
325 | controller = controller->next; | |
326 | } | |
327 | ||
328 | return NULL; | |
329 | } | |
330 | ||
331 | static struct agp_controller *agp_create_controller(pid_t id) | |
332 | { | |
333 | struct agp_controller *controller; | |
334 | ||
335 | controller = kmalloc(sizeof(struct agp_controller), GFP_KERNEL); | |
336 | ||
337 | if (controller == NULL) | |
338 | return NULL; | |
339 | ||
340 | memset(controller, 0, sizeof(struct agp_controller)); | |
341 | controller->pid = id; | |
342 | ||
343 | return controller; | |
344 | } | |
345 | ||
346 | static int agp_insert_controller(struct agp_controller *controller) | |
347 | { | |
348 | struct agp_controller *prev_controller; | |
349 | ||
350 | prev_controller = agp_fe.controllers; | |
351 | controller->next = prev_controller; | |
352 | ||
353 | if (prev_controller != NULL) | |
354 | prev_controller->prev = controller; | |
355 | ||
356 | agp_fe.controllers = controller; | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | static void agp_remove_all_clients(struct agp_controller *controller) | |
362 | { | |
363 | struct agp_client *client; | |
364 | struct agp_client *temp; | |
365 | ||
366 | client = controller->clients; | |
367 | ||
368 | while (client) { | |
369 | struct agp_file_private *priv; | |
370 | ||
371 | temp = client; | |
372 | agp_remove_seg_from_client(temp); | |
373 | priv = agp_find_private(temp->pid); | |
374 | ||
375 | if (priv != NULL) { | |
376 | clear_bit(AGP_FF_IS_VALID, &priv->access_flags); | |
377 | clear_bit(AGP_FF_IS_CLIENT, &priv->access_flags); | |
378 | } | |
379 | client = client->next; | |
380 | kfree(temp); | |
381 | } | |
382 | } | |
383 | ||
384 | static void agp_remove_all_memory(struct agp_controller *controller) | |
385 | { | |
386 | struct agp_memory *memory; | |
387 | struct agp_memory *temp; | |
388 | ||
389 | memory = controller->pool; | |
390 | ||
391 | while (memory) { | |
392 | temp = memory; | |
393 | memory = memory->next; | |
394 | agp_free_memory_wrap(temp); | |
395 | } | |
396 | } | |
397 | ||
398 | static int agp_remove_controller(struct agp_controller *controller) | |
399 | { | |
400 | struct agp_controller *prev_controller; | |
401 | struct agp_controller *next_controller; | |
402 | ||
403 | prev_controller = controller->prev; | |
404 | next_controller = controller->next; | |
405 | ||
406 | if (prev_controller != NULL) { | |
407 | prev_controller->next = next_controller; | |
408 | if (next_controller != NULL) | |
409 | next_controller->prev = prev_controller; | |
410 | ||
411 | } else { | |
412 | if (next_controller != NULL) | |
413 | next_controller->prev = NULL; | |
414 | ||
415 | agp_fe.controllers = next_controller; | |
416 | } | |
417 | ||
418 | agp_remove_all_memory(controller); | |
419 | agp_remove_all_clients(controller); | |
420 | ||
421 | if (agp_fe.current_controller == controller) { | |
422 | agp_fe.current_controller = NULL; | |
423 | agp_fe.backend_acquired = FALSE; | |
424 | agp_backend_release(agp_bridge); | |
425 | } | |
426 | kfree(controller); | |
427 | return 0; | |
428 | } | |
429 | ||
430 | static void agp_controller_make_current(struct agp_controller *controller) | |
431 | { | |
432 | struct agp_client *clients; | |
433 | ||
434 | clients = controller->clients; | |
435 | ||
436 | while (clients != NULL) { | |
437 | struct agp_file_private *priv; | |
438 | ||
439 | priv = agp_find_private(clients->pid); | |
440 | ||
441 | if (priv != NULL) { | |
442 | set_bit(AGP_FF_IS_VALID, &priv->access_flags); | |
443 | set_bit(AGP_FF_IS_CLIENT, &priv->access_flags); | |
444 | } | |
445 | clients = clients->next; | |
446 | } | |
447 | ||
448 | agp_fe.current_controller = controller; | |
449 | } | |
450 | ||
451 | static void agp_controller_release_current(struct agp_controller *controller, | |
452 | struct agp_file_private *controller_priv) | |
453 | { | |
454 | struct agp_client *clients; | |
455 | ||
456 | clear_bit(AGP_FF_IS_VALID, &controller_priv->access_flags); | |
457 | clients = controller->clients; | |
458 | ||
459 | while (clients != NULL) { | |
460 | struct agp_file_private *priv; | |
461 | ||
462 | priv = agp_find_private(clients->pid); | |
463 | ||
464 | if (priv != NULL) | |
465 | clear_bit(AGP_FF_IS_VALID, &priv->access_flags); | |
466 | ||
467 | clients = clients->next; | |
468 | } | |
469 | ||
470 | agp_fe.current_controller = NULL; | |
471 | agp_fe.used_by_controller = FALSE; | |
472 | agp_backend_release(agp_bridge); | |
473 | } | |
474 | ||
475 | /* | |
476 | * Routines for managing client lists - | |
477 | * These routines are for managing the list of auth'ed clients. | |
478 | */ | |
479 | ||
480 | static struct agp_client | |
481 | *agp_find_client_in_controller(struct agp_controller *controller, pid_t id) | |
482 | { | |
483 | struct agp_client *client; | |
484 | ||
485 | if (controller == NULL) | |
486 | return NULL; | |
487 | ||
488 | client = controller->clients; | |
489 | ||
490 | while (client != NULL) { | |
491 | if (client->pid == id) | |
492 | return client; | |
493 | client = client->next; | |
494 | } | |
495 | ||
496 | return NULL; | |
497 | } | |
498 | ||
499 | static struct agp_controller *agp_find_controller_for_client(pid_t id) | |
500 | { | |
501 | struct agp_controller *controller; | |
502 | ||
503 | controller = agp_fe.controllers; | |
504 | ||
505 | while (controller != NULL) { | |
506 | if ((agp_find_client_in_controller(controller, id)) != NULL) | |
507 | return controller; | |
508 | controller = controller->next; | |
509 | } | |
510 | ||
511 | return NULL; | |
512 | } | |
513 | ||
514 | static struct agp_client *agp_find_client_by_pid(pid_t id) | |
515 | { | |
516 | struct agp_client *temp; | |
517 | ||
518 | if (agp_fe.current_controller == NULL) | |
519 | return NULL; | |
520 | ||
521 | temp = agp_find_client_in_controller(agp_fe.current_controller, id); | |
522 | return temp; | |
523 | } | |
524 | ||
525 | static void agp_insert_client(struct agp_client *client) | |
526 | { | |
527 | struct agp_client *prev_client; | |
528 | ||
529 | prev_client = agp_fe.current_controller->clients; | |
530 | client->next = prev_client; | |
531 | ||
532 | if (prev_client != NULL) | |
533 | prev_client->prev = client; | |
534 | ||
535 | agp_fe.current_controller->clients = client; | |
536 | agp_fe.current_controller->num_clients++; | |
537 | } | |
538 | ||
539 | static struct agp_client *agp_create_client(pid_t id) | |
540 | { | |
541 | struct agp_client *new_client; | |
542 | ||
543 | new_client = kmalloc(sizeof(struct agp_client), GFP_KERNEL); | |
544 | ||
545 | if (new_client == NULL) | |
546 | return NULL; | |
547 | ||
548 | memset(new_client, 0, sizeof(struct agp_client)); | |
549 | new_client->pid = id; | |
550 | agp_insert_client(new_client); | |
551 | return new_client; | |
552 | } | |
553 | ||
554 | static int agp_remove_client(pid_t id) | |
555 | { | |
556 | struct agp_client *client; | |
557 | struct agp_client *prev_client; | |
558 | struct agp_client *next_client; | |
559 | struct agp_controller *controller; | |
560 | ||
561 | controller = agp_find_controller_for_client(id); | |
562 | if (controller == NULL) | |
563 | return -EINVAL; | |
564 | ||
565 | client = agp_find_client_in_controller(controller, id); | |
566 | if (client == NULL) | |
567 | return -EINVAL; | |
568 | ||
569 | prev_client = client->prev; | |
570 | next_client = client->next; | |
571 | ||
572 | if (prev_client != NULL) { | |
573 | prev_client->next = next_client; | |
574 | if (next_client != NULL) | |
575 | next_client->prev = prev_client; | |
576 | ||
577 | } else { | |
578 | if (next_client != NULL) | |
579 | next_client->prev = NULL; | |
580 | controller->clients = next_client; | |
581 | } | |
582 | ||
583 | controller->num_clients--; | |
584 | agp_remove_seg_from_client(client); | |
585 | kfree(client); | |
586 | return 0; | |
587 | } | |
588 | ||
589 | /* End - Routines for managing client lists */ | |
590 | ||
591 | /* File Operations */ | |
592 | ||
593 | static int agp_mmap(struct file *file, struct vm_area_struct *vma) | |
594 | { | |
595 | unsigned int size, current_size; | |
596 | unsigned long offset; | |
597 | struct agp_client *client; | |
598 | struct agp_file_private *priv = file->private_data; | |
599 | struct agp_kern_info kerninfo; | |
600 | ||
601 | down(&(agp_fe.agp_mutex)); | |
602 | ||
603 | if (agp_fe.backend_acquired != TRUE) | |
604 | goto out_eperm; | |
605 | ||
606 | if (!(test_bit(AGP_FF_IS_VALID, &priv->access_flags))) | |
607 | goto out_eperm; | |
608 | ||
609 | agp_copy_info(agp_bridge, &kerninfo); | |
610 | size = vma->vm_end - vma->vm_start; | |
611 | current_size = kerninfo.aper_size; | |
612 | current_size = current_size * 0x100000; | |
613 | offset = vma->vm_pgoff << PAGE_SHIFT; | |
614 | DBG("%lx:%lx", offset, offset+size); | |
615 | ||
616 | if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) { | |
617 | if ((size + offset) > current_size) | |
618 | goto out_inval; | |
619 | ||
620 | client = agp_find_client_by_pid(current->pid); | |
621 | ||
622 | if (client == NULL) | |
623 | goto out_eperm; | |
624 | ||
625 | if (!agp_find_seg_in_client(client, offset, size, vma->vm_page_prot)) | |
626 | goto out_inval; | |
627 | ||
628 | DBG("client vm_ops=%p", kerninfo.vm_ops); | |
629 | if (kerninfo.vm_ops) { | |
630 | vma->vm_ops = kerninfo.vm_ops; | |
631 | } else if (io_remap_pfn_range(vma, vma->vm_start, | |
632 | (kerninfo.aper_base + offset) >> PAGE_SHIFT, | |
633 | size, vma->vm_page_prot)) { | |
634 | goto out_again; | |
635 | } | |
636 | up(&(agp_fe.agp_mutex)); | |
637 | return 0; | |
638 | } | |
639 | ||
640 | if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) { | |
641 | if (size != current_size) | |
642 | goto out_inval; | |
643 | ||
644 | DBG("controller vm_ops=%p", kerninfo.vm_ops); | |
645 | if (kerninfo.vm_ops) { | |
646 | vma->vm_ops = kerninfo.vm_ops; | |
647 | } else if (io_remap_pfn_range(vma, vma->vm_start, | |
648 | kerninfo.aper_base >> PAGE_SHIFT, | |
649 | size, vma->vm_page_prot)) { | |
650 | goto out_again; | |
651 | } | |
652 | up(&(agp_fe.agp_mutex)); | |
653 | return 0; | |
654 | } | |
655 | ||
656 | out_eperm: | |
657 | up(&(agp_fe.agp_mutex)); | |
658 | return -EPERM; | |
659 | ||
660 | out_inval: | |
661 | up(&(agp_fe.agp_mutex)); | |
662 | return -EINVAL; | |
663 | ||
664 | out_again: | |
665 | up(&(agp_fe.agp_mutex)); | |
666 | return -EAGAIN; | |
667 | } | |
668 | ||
669 | static int agp_release(struct inode *inode, struct file *file) | |
670 | { | |
671 | struct agp_file_private *priv = file->private_data; | |
672 | ||
673 | down(&(agp_fe.agp_mutex)); | |
674 | ||
675 | DBG("priv=%p", priv); | |
676 | ||
677 | if (test_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags)) { | |
678 | struct agp_controller *controller; | |
679 | ||
680 | controller = agp_find_controller_by_pid(priv->my_pid); | |
681 | ||
682 | if (controller != NULL) { | |
683 | if (controller == agp_fe.current_controller) | |
684 | agp_controller_release_current(controller, priv); | |
685 | agp_remove_controller(controller); | |
686 | controller = NULL; | |
687 | } | |
688 | } | |
689 | ||
690 | if (test_bit(AGP_FF_IS_CLIENT, &priv->access_flags)) | |
691 | agp_remove_client(priv->my_pid); | |
692 | ||
693 | agp_remove_file_private(priv); | |
694 | kfree(priv); | |
695 | file->private_data = NULL; | |
696 | up(&(agp_fe.agp_mutex)); | |
697 | return 0; | |
698 | } | |
699 | ||
700 | static int agp_open(struct inode *inode, struct file *file) | |
701 | { | |
702 | int minor = iminor(inode); | |
703 | struct agp_file_private *priv; | |
704 | struct agp_client *client; | |
705 | int rc = -ENXIO; | |
706 | ||
707 | down(&(agp_fe.agp_mutex)); | |
708 | ||
709 | if (minor != AGPGART_MINOR) | |
710 | goto err_out; | |
711 | ||
712 | priv = kmalloc(sizeof(struct agp_file_private), GFP_KERNEL); | |
713 | if (priv == NULL) | |
714 | goto err_out_nomem; | |
715 | ||
716 | memset(priv, 0, sizeof(struct agp_file_private)); | |
717 | set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags); | |
718 | priv->my_pid = current->pid; | |
719 | ||
720 | if ((current->uid == 0) || (current->suid == 0)) { | |
721 | /* Root priv, can be controller */ | |
722 | set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags); | |
723 | } | |
724 | client = agp_find_client_by_pid(current->pid); | |
725 | ||
726 | if (client != NULL) { | |
727 | set_bit(AGP_FF_IS_CLIENT, &priv->access_flags); | |
728 | set_bit(AGP_FF_IS_VALID, &priv->access_flags); | |
729 | } | |
730 | file->private_data = (void *) priv; | |
731 | agp_insert_file_private(priv); | |
732 | DBG("private=%p, client=%p", priv, client); | |
733 | up(&(agp_fe.agp_mutex)); | |
734 | return 0; | |
735 | ||
736 | err_out_nomem: | |
737 | rc = -ENOMEM; | |
738 | err_out: | |
739 | up(&(agp_fe.agp_mutex)); | |
740 | return rc; | |
741 | } | |
742 | ||
743 | ||
744 | static ssize_t agp_read(struct file *file, char __user *buf, | |
745 | size_t count, loff_t * ppos) | |
746 | { | |
747 | return -EINVAL; | |
748 | } | |
749 | ||
750 | static ssize_t agp_write(struct file *file, const char __user *buf, | |
751 | size_t count, loff_t * ppos) | |
752 | { | |
753 | return -EINVAL; | |
754 | } | |
755 | ||
756 | static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg) | |
757 | { | |
758 | struct agp_info userinfo; | |
759 | struct agp_kern_info kerninfo; | |
760 | ||
761 | agp_copy_info(agp_bridge, &kerninfo); | |
762 | ||
763 | userinfo.version.major = kerninfo.version.major; | |
764 | userinfo.version.minor = kerninfo.version.minor; | |
765 | userinfo.bridge_id = kerninfo.device->vendor | | |
766 | (kerninfo.device->device << 16); | |
767 | userinfo.agp_mode = kerninfo.mode; | |
768 | userinfo.aper_base = kerninfo.aper_base; | |
769 | userinfo.aper_size = kerninfo.aper_size; | |
770 | userinfo.pg_total = userinfo.pg_system = kerninfo.max_memory; | |
771 | userinfo.pg_used = kerninfo.current_memory; | |
772 | ||
773 | if (copy_to_user(arg, &userinfo, sizeof(struct agp_info))) | |
774 | return -EFAULT; | |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
779 | static int agpioc_acquire_wrap(struct agp_file_private *priv) | |
780 | { | |
781 | struct agp_controller *controller; | |
782 | ||
783 | DBG(""); | |
784 | ||
785 | if (!(test_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags))) | |
786 | return -EPERM; | |
787 | ||
788 | if (agp_fe.current_controller != NULL) | |
789 | return -EBUSY; | |
790 | ||
791 | if(!agp_bridge) | |
792 | return -ENODEV; | |
793 | ||
794 | if (atomic_read(&agp_bridge->agp_in_use)) | |
795 | return -EBUSY; | |
796 | ||
797 | atomic_inc(&agp_bridge->agp_in_use); | |
798 | ||
799 | agp_fe.backend_acquired = TRUE; | |
800 | ||
801 | controller = agp_find_controller_by_pid(priv->my_pid); | |
802 | ||
803 | if (controller != NULL) { | |
804 | agp_controller_make_current(controller); | |
805 | } else { | |
806 | controller = agp_create_controller(priv->my_pid); | |
807 | ||
808 | if (controller == NULL) { | |
809 | agp_fe.backend_acquired = FALSE; | |
810 | agp_backend_release(agp_bridge); | |
811 | return -ENOMEM; | |
812 | } | |
813 | agp_insert_controller(controller); | |
814 | agp_controller_make_current(controller); | |
815 | } | |
816 | ||
817 | set_bit(AGP_FF_IS_CONTROLLER, &priv->access_flags); | |
818 | set_bit(AGP_FF_IS_VALID, &priv->access_flags); | |
819 | return 0; | |
820 | } | |
821 | ||
822 | static int agpioc_release_wrap(struct agp_file_private *priv) | |
823 | { | |
824 | DBG(""); | |
825 | agp_controller_release_current(agp_fe.current_controller, priv); | |
826 | return 0; | |
827 | } | |
828 | ||
829 | static int agpioc_setup_wrap(struct agp_file_private *priv, void __user *arg) | |
830 | { | |
831 | struct agp_setup mode; | |
832 | ||
833 | DBG(""); | |
834 | if (copy_from_user(&mode, arg, sizeof(struct agp_setup))) | |
835 | return -EFAULT; | |
836 | ||
837 | agp_enable(agp_bridge, mode.agp_mode); | |
838 | return 0; | |
839 | } | |
840 | ||
841 | static int agpioc_reserve_wrap(struct agp_file_private *priv, void __user *arg) | |
842 | { | |
843 | struct agp_region reserve; | |
844 | struct agp_client *client; | |
845 | struct agp_file_private *client_priv; | |
846 | ||
847 | DBG(""); | |
848 | if (copy_from_user(&reserve, arg, sizeof(struct agp_region))) | |
849 | return -EFAULT; | |
850 | ||
851 | if ((unsigned) reserve.seg_count >= ~0U/sizeof(struct agp_segment)) | |
852 | return -EFAULT; | |
853 | ||
854 | client = agp_find_client_by_pid(reserve.pid); | |
855 | ||
856 | if (reserve.seg_count == 0) { | |
857 | /* remove a client */ | |
858 | client_priv = agp_find_private(reserve.pid); | |
859 | ||
860 | if (client_priv != NULL) { | |
861 | set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags); | |
862 | set_bit(AGP_FF_IS_VALID, &client_priv->access_flags); | |
863 | } | |
864 | if (client == NULL) { | |
865 | /* client is already removed */ | |
866 | return 0; | |
867 | } | |
868 | return agp_remove_client(reserve.pid); | |
869 | } else { | |
870 | struct agp_segment *segment; | |
871 | ||
872 | if (reserve.seg_count >= 16384) | |
873 | return -EINVAL; | |
874 | ||
875 | segment = kmalloc((sizeof(struct agp_segment) * reserve.seg_count), | |
876 | GFP_KERNEL); | |
877 | ||
878 | if (segment == NULL) | |
879 | return -ENOMEM; | |
880 | ||
881 | if (copy_from_user(segment, (void __user *) reserve.seg_list, | |
882 | sizeof(struct agp_segment) * reserve.seg_count)) { | |
883 | kfree(segment); | |
884 | return -EFAULT; | |
885 | } | |
886 | reserve.seg_list = segment; | |
887 | ||
888 | if (client == NULL) { | |
889 | /* Create the client and add the segment */ | |
890 | client = agp_create_client(reserve.pid); | |
891 | ||
892 | if (client == NULL) { | |
893 | kfree(segment); | |
894 | return -ENOMEM; | |
895 | } | |
896 | client_priv = agp_find_private(reserve.pid); | |
897 | ||
898 | if (client_priv != NULL) { | |
899 | set_bit(AGP_FF_IS_CLIENT, &client_priv->access_flags); | |
900 | set_bit(AGP_FF_IS_VALID, &client_priv->access_flags); | |
901 | } | |
902 | } | |
903 | return agp_create_segment(client, &reserve); | |
904 | } | |
905 | /* Will never really happen */ | |
906 | return -EINVAL; | |
907 | } | |
908 | ||
909 | static int agpioc_protect_wrap(struct agp_file_private *priv) | |
910 | { | |
911 | DBG(""); | |
912 | /* This function is not currently implemented */ | |
913 | return -EINVAL; | |
914 | } | |
915 | ||
916 | static int agpioc_allocate_wrap(struct agp_file_private *priv, void __user *arg) | |
917 | { | |
918 | struct agp_memory *memory; | |
919 | struct agp_allocate alloc; | |
920 | ||
921 | DBG(""); | |
922 | if (copy_from_user(&alloc, arg, sizeof(struct agp_allocate))) | |
923 | return -EFAULT; | |
924 | ||
925 | memory = agp_allocate_memory_wrap(alloc.pg_count, alloc.type); | |
926 | ||
927 | if (memory == NULL) | |
928 | return -ENOMEM; | |
929 | ||
930 | alloc.key = memory->key; | |
931 | alloc.physical = memory->physical; | |
932 | ||
933 | if (copy_to_user(arg, &alloc, sizeof(struct agp_allocate))) { | |
934 | agp_free_memory_wrap(memory); | |
935 | return -EFAULT; | |
936 | } | |
937 | return 0; | |
938 | } | |
939 | ||
940 | static int agpioc_deallocate_wrap(struct agp_file_private *priv, int arg) | |
941 | { | |
942 | struct agp_memory *memory; | |
943 | ||
944 | DBG(""); | |
945 | memory = agp_find_mem_by_key(arg); | |
946 | ||
947 | if (memory == NULL) | |
948 | return -EINVAL; | |
949 | ||
950 | agp_free_memory_wrap(memory); | |
951 | return 0; | |
952 | } | |
953 | ||
954 | static int agpioc_bind_wrap(struct agp_file_private *priv, void __user *arg) | |
955 | { | |
956 | struct agp_bind bind_info; | |
957 | struct agp_memory *memory; | |
958 | ||
959 | DBG(""); | |
960 | if (copy_from_user(&bind_info, arg, sizeof(struct agp_bind))) | |
961 | return -EFAULT; | |
962 | ||
963 | memory = agp_find_mem_by_key(bind_info.key); | |
964 | ||
965 | if (memory == NULL) | |
966 | return -EINVAL; | |
967 | ||
968 | return agp_bind_memory(memory, bind_info.pg_start); | |
969 | } | |
970 | ||
971 | static int agpioc_unbind_wrap(struct agp_file_private *priv, void __user *arg) | |
972 | { | |
973 | struct agp_memory *memory; | |
974 | struct agp_unbind unbind; | |
975 | ||
976 | DBG(""); | |
977 | if (copy_from_user(&unbind, arg, sizeof(struct agp_unbind))) | |
978 | return -EFAULT; | |
979 | ||
980 | memory = agp_find_mem_by_key(unbind.key); | |
981 | ||
982 | if (memory == NULL) | |
983 | return -EINVAL; | |
984 | ||
985 | return agp_unbind_memory(memory); | |
986 | } | |
987 | ||
988 | static int agp_ioctl(struct inode *inode, struct file *file, | |
989 | unsigned int cmd, unsigned long arg) | |
990 | { | |
991 | struct agp_file_private *curr_priv = file->private_data; | |
992 | int ret_val = -ENOTTY; | |
993 | ||
994 | DBG("priv=%p, cmd=%x", curr_priv, cmd); | |
995 | down(&(agp_fe.agp_mutex)); | |
996 | ||
997 | if ((agp_fe.current_controller == NULL) && | |
998 | (cmd != AGPIOC_ACQUIRE)) { | |
999 | ret_val = -EINVAL; | |
1000 | goto ioctl_out; | |
1001 | } | |
1002 | if ((agp_fe.backend_acquired != TRUE) && | |
1003 | (cmd != AGPIOC_ACQUIRE)) { | |
1004 | ret_val = -EBUSY; | |
1005 | goto ioctl_out; | |
1006 | } | |
1007 | if (cmd != AGPIOC_ACQUIRE) { | |
1008 | if (!(test_bit(AGP_FF_IS_CONTROLLER, &curr_priv->access_flags))) { | |
1009 | ret_val = -EPERM; | |
1010 | goto ioctl_out; | |
1011 | } | |
1012 | /* Use the original pid of the controller, | |
1013 | * in case it's threaded */ | |
1014 | ||
1015 | if (agp_fe.current_controller->pid != curr_priv->my_pid) { | |
1016 | ret_val = -EBUSY; | |
1017 | goto ioctl_out; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | switch (cmd) { | |
1022 | case AGPIOC_INFO: | |
1023 | ret_val = agpioc_info_wrap(curr_priv, (void __user *) arg); | |
1024 | break; | |
1025 | ||
1026 | case AGPIOC_ACQUIRE: | |
1027 | ret_val = agpioc_acquire_wrap(curr_priv); | |
1028 | break; | |
1029 | ||
1030 | case AGPIOC_RELEASE: | |
1031 | ret_val = agpioc_release_wrap(curr_priv); | |
1032 | break; | |
1033 | ||
1034 | case AGPIOC_SETUP: | |
1035 | ret_val = agpioc_setup_wrap(curr_priv, (void __user *) arg); | |
1036 | break; | |
1037 | ||
1038 | case AGPIOC_RESERVE: | |
1039 | ret_val = agpioc_reserve_wrap(curr_priv, (void __user *) arg); | |
1040 | break; | |
1041 | ||
1042 | case AGPIOC_PROTECT: | |
1043 | ret_val = agpioc_protect_wrap(curr_priv); | |
1044 | break; | |
1045 | ||
1046 | case AGPIOC_ALLOCATE: | |
1047 | ret_val = agpioc_allocate_wrap(curr_priv, (void __user *) arg); | |
1048 | break; | |
1049 | ||
1050 | case AGPIOC_DEALLOCATE: | |
1051 | ret_val = agpioc_deallocate_wrap(curr_priv, (int) arg); | |
1052 | break; | |
1053 | ||
1054 | case AGPIOC_BIND: | |
1055 | ret_val = agpioc_bind_wrap(curr_priv, (void __user *) arg); | |
1056 | break; | |
1057 | ||
1058 | case AGPIOC_UNBIND: | |
1059 | ret_val = agpioc_unbind_wrap(curr_priv, (void __user *) arg); | |
1060 | break; | |
1061 | } | |
1062 | ||
1063 | ioctl_out: | |
1064 | DBG("ioctl returns %d\n", ret_val); | |
1065 | up(&(agp_fe.agp_mutex)); | |
1066 | return ret_val; | |
1067 | } | |
1068 | ||
1069 | static struct file_operations agp_fops = | |
1070 | { | |
1071 | .owner = THIS_MODULE, | |
1072 | .llseek = no_llseek, | |
1073 | .read = agp_read, | |
1074 | .write = agp_write, | |
1075 | .ioctl = agp_ioctl, | |
1076 | .mmap = agp_mmap, | |
1077 | .open = agp_open, | |
1078 | .release = agp_release, | |
1079 | }; | |
1080 | ||
1081 | static struct miscdevice agp_miscdev = | |
1082 | { | |
1083 | .minor = AGPGART_MINOR, | |
1084 | .name = "agpgart", | |
1085 | .fops = &agp_fops | |
1086 | }; | |
1087 | ||
1088 | int agp_frontend_initialize(void) | |
1089 | { | |
1090 | memset(&agp_fe, 0, sizeof(struct agp_front_data)); | |
1091 | sema_init(&(agp_fe.agp_mutex), 1); | |
1092 | ||
1093 | if (misc_register(&agp_miscdev)) { | |
1094 | printk(KERN_ERR PFX "unable to get minor: %d\n", AGPGART_MINOR); | |
1095 | return -EIO; | |
1096 | } | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | void agp_frontend_cleanup(void) | |
1101 | { | |
1102 | misc_deregister(&agp_miscdev); | |
1103 | } |