Commit | Line | Data |
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1da177e4 LT |
1 | /** |
2 | * \file drm_context.h | |
3 | * IOCTLs for generic contexts | |
4 | * | |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> | |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com | |
11 | * | |
12 | * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a | |
17 | * copy of this software and associated documentation files (the "Software"), | |
18 | * to deal in the Software without restriction, including without limitation | |
19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
20 | * and/or sell copies of the Software, and to permit persons to whom the | |
21 | * Software is furnished to do so, subject to the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice (including the next | |
24 | * paragraph) shall be included in all copies or substantial portions of the | |
25 | * Software. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
33 | * OTHER DEALINGS IN THE SOFTWARE. | |
34 | */ | |
35 | ||
36 | /* | |
37 | * ChangeLog: | |
38 | * 2001-11-16 Torsten Duwe <duwe@caldera.de> | |
39 | * added context constructor/destructor hooks, | |
40 | * needed by SiS driver's memory management. | |
41 | */ | |
42 | ||
43 | #include "drmP.h" | |
44 | ||
45 | /******************************************************************/ | |
46 | /** \name Context bitmap support */ | |
47 | /*@{*/ | |
48 | ||
49 | /** | |
50 | * Free a handle from the context bitmap. | |
51 | * | |
52 | * \param dev DRM device. | |
53 | * \param ctx_handle context handle. | |
54 | * | |
55 | * Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry | |
56 | * in drm_device::context_sareas, while holding the drm_device::struct_sem | |
57 | * lock. | |
58 | */ | |
59 | void drm_ctxbitmap_free( drm_device_t *dev, int ctx_handle ) | |
60 | { | |
61 | if ( ctx_handle < 0 ) goto failed; | |
62 | if ( !dev->ctx_bitmap ) goto failed; | |
63 | ||
64 | if ( ctx_handle < DRM_MAX_CTXBITMAP ) { | |
65 | down(&dev->struct_sem); | |
66 | clear_bit( ctx_handle, dev->ctx_bitmap ); | |
67 | dev->context_sareas[ctx_handle] = NULL; | |
68 | up(&dev->struct_sem); | |
69 | return; | |
70 | } | |
71 | failed: | |
72 | DRM_ERROR( "Attempt to free invalid context handle: %d\n", | |
73 | ctx_handle ); | |
74 | return; | |
75 | } | |
76 | ||
77 | /** | |
78 | * Context bitmap allocation. | |
79 | * | |
80 | * \param dev DRM device. | |
81 | * \return (non-negative) context handle on success or a negative number on failure. | |
82 | * | |
83 | * Find the first zero bit in drm_device::ctx_bitmap and (re)allocates | |
84 | * drm_device::context_sareas to accommodate the new entry while holding the | |
85 | * drm_device::struct_sem lock. | |
86 | */ | |
c94f7029 | 87 | static int drm_ctxbitmap_next( drm_device_t *dev ) |
1da177e4 LT |
88 | { |
89 | int bit; | |
90 | ||
91 | if(!dev->ctx_bitmap) return -1; | |
92 | ||
93 | down(&dev->struct_sem); | |
94 | bit = find_first_zero_bit( dev->ctx_bitmap, DRM_MAX_CTXBITMAP ); | |
95 | if ( bit < DRM_MAX_CTXBITMAP ) { | |
96 | set_bit( bit, dev->ctx_bitmap ); | |
97 | DRM_DEBUG( "drm_ctxbitmap_next bit : %d\n", bit ); | |
98 | if((bit+1) > dev->max_context) { | |
99 | dev->max_context = (bit+1); | |
100 | if(dev->context_sareas) { | |
101 | drm_map_t **ctx_sareas; | |
102 | ||
103 | ctx_sareas = drm_realloc(dev->context_sareas, | |
104 | (dev->max_context - 1) * | |
105 | sizeof(*dev->context_sareas), | |
106 | dev->max_context * | |
107 | sizeof(*dev->context_sareas), | |
108 | DRM_MEM_MAPS); | |
109 | if(!ctx_sareas) { | |
110 | clear_bit(bit, dev->ctx_bitmap); | |
111 | up(&dev->struct_sem); | |
112 | return -1; | |
113 | } | |
114 | dev->context_sareas = ctx_sareas; | |
115 | dev->context_sareas[bit] = NULL; | |
116 | } else { | |
117 | /* max_context == 1 at this point */ | |
118 | dev->context_sareas = drm_alloc( | |
119 | dev->max_context * | |
120 | sizeof(*dev->context_sareas), | |
121 | DRM_MEM_MAPS); | |
122 | if(!dev->context_sareas) { | |
123 | clear_bit(bit, dev->ctx_bitmap); | |
124 | up(&dev->struct_sem); | |
125 | return -1; | |
126 | } | |
127 | dev->context_sareas[bit] = NULL; | |
128 | } | |
129 | } | |
130 | up(&dev->struct_sem); | |
131 | return bit; | |
132 | } | |
133 | up(&dev->struct_sem); | |
134 | return -1; | |
135 | } | |
136 | ||
137 | /** | |
138 | * Context bitmap initialization. | |
139 | * | |
140 | * \param dev DRM device. | |
141 | * | |
142 | * Allocates and initialize drm_device::ctx_bitmap and drm_device::context_sareas, while holding | |
143 | * the drm_device::struct_sem lock. | |
144 | */ | |
145 | int drm_ctxbitmap_init( drm_device_t *dev ) | |
146 | { | |
147 | int i; | |
148 | int temp; | |
149 | ||
150 | down(&dev->struct_sem); | |
151 | dev->ctx_bitmap = (unsigned long *) drm_alloc( PAGE_SIZE, | |
152 | DRM_MEM_CTXBITMAP ); | |
153 | if ( dev->ctx_bitmap == NULL ) { | |
154 | up(&dev->struct_sem); | |
155 | return -ENOMEM; | |
156 | } | |
157 | memset( (void *)dev->ctx_bitmap, 0, PAGE_SIZE ); | |
158 | dev->context_sareas = NULL; | |
159 | dev->max_context = -1; | |
160 | up(&dev->struct_sem); | |
161 | ||
162 | for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) { | |
163 | temp = drm_ctxbitmap_next( dev ); | |
164 | DRM_DEBUG( "drm_ctxbitmap_init : %d\n", temp ); | |
165 | } | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | /** | |
171 | * Context bitmap cleanup. | |
172 | * | |
173 | * \param dev DRM device. | |
174 | * | |
175 | * Frees drm_device::ctx_bitmap and drm_device::context_sareas, while holding | |
176 | * the drm_device::struct_sem lock. | |
177 | */ | |
178 | void drm_ctxbitmap_cleanup( drm_device_t *dev ) | |
179 | { | |
180 | down(&dev->struct_sem); | |
181 | if( dev->context_sareas ) drm_free( dev->context_sareas, | |
182 | sizeof(*dev->context_sareas) * | |
183 | dev->max_context, | |
184 | DRM_MEM_MAPS ); | |
185 | drm_free( (void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP ); | |
186 | up(&dev->struct_sem); | |
187 | } | |
188 | ||
189 | /*@}*/ | |
190 | ||
191 | /******************************************************************/ | |
192 | /** \name Per Context SAREA Support */ | |
193 | /*@{*/ | |
194 | ||
195 | /** | |
196 | * Get per-context SAREA. | |
197 | * | |
198 | * \param inode device inode. | |
199 | * \param filp file pointer. | |
200 | * \param cmd command. | |
201 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
202 | * \return zero on success or a negative number on failure. | |
203 | * | |
204 | * Gets the map from drm_device::context_sareas with the handle specified and | |
205 | * returns its handle. | |
206 | */ | |
207 | int drm_getsareactx(struct inode *inode, struct file *filp, | |
208 | unsigned int cmd, unsigned long arg) | |
209 | { | |
210 | drm_file_t *priv = filp->private_data; | |
211 | drm_device_t *dev = priv->head->dev; | |
212 | drm_ctx_priv_map_t __user *argp = (void __user *)arg; | |
213 | drm_ctx_priv_map_t request; | |
214 | drm_map_t *map; | |
d1f2b55a | 215 | drm_map_list_t *_entry; |
1da177e4 LT |
216 | |
217 | if (copy_from_user(&request, argp, sizeof(request))) | |
218 | return -EFAULT; | |
219 | ||
220 | down(&dev->struct_sem); | |
221 | if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) { | |
222 | up(&dev->struct_sem); | |
223 | return -EINVAL; | |
224 | } | |
225 | ||
226 | map = dev->context_sareas[request.ctx_id]; | |
227 | up(&dev->struct_sem); | |
228 | ||
d1f2b55a DA |
229 | request.handle = 0; |
230 | list_for_each_entry(_entry, &dev->maplist->head,head) { | |
231 | if (_entry->map == map) { | |
232 | request.handle = (void *)(unsigned long)_entry->user_token; | |
233 | break; | |
234 | } | |
235 | } | |
236 | if (request.handle == 0) | |
237 | return -EINVAL; | |
238 | ||
239 | ||
1da177e4 LT |
240 | if (copy_to_user(argp, &request, sizeof(request))) |
241 | return -EFAULT; | |
242 | return 0; | |
243 | } | |
244 | ||
245 | /** | |
246 | * Set per-context SAREA. | |
247 | * | |
248 | * \param inode device inode. | |
249 | * \param filp file pointer. | |
250 | * \param cmd command. | |
251 | * \param arg user argument pointing to a drm_ctx_priv_map structure. | |
252 | * \return zero on success or a negative number on failure. | |
253 | * | |
254 | * Searches the mapping specified in \p arg and update the entry in | |
255 | * drm_device::context_sareas with it. | |
256 | */ | |
257 | int drm_setsareactx(struct inode *inode, struct file *filp, | |
258 | unsigned int cmd, unsigned long arg) | |
259 | { | |
260 | drm_file_t *priv = filp->private_data; | |
261 | drm_device_t *dev = priv->head->dev; | |
262 | drm_ctx_priv_map_t request; | |
263 | drm_map_t *map = NULL; | |
264 | drm_map_list_t *r_list = NULL; | |
265 | struct list_head *list; | |
266 | ||
267 | if (copy_from_user(&request, | |
268 | (drm_ctx_priv_map_t __user *)arg, | |
269 | sizeof(request))) | |
270 | return -EFAULT; | |
271 | ||
272 | down(&dev->struct_sem); | |
273 | list_for_each(list, &dev->maplist->head) { | |
274 | r_list = list_entry(list, drm_map_list_t, head); | |
9a186645 | 275 | if (r_list->map |
d1f2b55a | 276 | && r_list->user_token == (unsigned long) request.handle) |
1da177e4 LT |
277 | goto found; |
278 | } | |
279 | bad: | |
280 | up(&dev->struct_sem); | |
281 | return -EINVAL; | |
282 | ||
283 | found: | |
284 | map = r_list->map; | |
285 | if (!map) goto bad; | |
286 | if (dev->max_context < 0) | |
287 | goto bad; | |
288 | if (request.ctx_id >= (unsigned) dev->max_context) | |
289 | goto bad; | |
290 | dev->context_sareas[request.ctx_id] = map; | |
291 | up(&dev->struct_sem); | |
292 | return 0; | |
293 | } | |
294 | ||
295 | /*@}*/ | |
296 | ||
297 | /******************************************************************/ | |
298 | /** \name The actual DRM context handling routines */ | |
299 | /*@{*/ | |
300 | ||
301 | /** | |
302 | * Switch context. | |
303 | * | |
304 | * \param dev DRM device. | |
305 | * \param old old context handle. | |
306 | * \param new new context handle. | |
307 | * \return zero on success or a negative number on failure. | |
308 | * | |
309 | * Attempt to set drm_device::context_flag. | |
310 | */ | |
f210973b | 311 | static int drm_context_switch( drm_device_t *dev, int old, int new ) |
1da177e4 LT |
312 | { |
313 | if ( test_and_set_bit( 0, &dev->context_flag ) ) { | |
314 | DRM_ERROR( "Reentering -- FIXME\n" ); | |
315 | return -EBUSY; | |
316 | } | |
317 | ||
318 | ||
319 | DRM_DEBUG( "Context switch from %d to %d\n", old, new ); | |
320 | ||
321 | if ( new == dev->last_context ) { | |
322 | clear_bit( 0, &dev->context_flag ); | |
323 | return 0; | |
324 | } | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | /** | |
330 | * Complete context switch. | |
331 | * | |
332 | * \param dev DRM device. | |
333 | * \param new new context handle. | |
334 | * \return zero on success or a negative number on failure. | |
335 | * | |
336 | * Updates drm_device::last_context and drm_device::last_switch. Verifies the | |
337 | * hardware lock is held, clears the drm_device::context_flag and wakes up | |
338 | * drm_device::context_wait. | |
339 | */ | |
c94f7029 | 340 | static int drm_context_switch_complete( drm_device_t *dev, int new ) |
1da177e4 LT |
341 | { |
342 | dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ | |
343 | dev->last_switch = jiffies; | |
344 | ||
345 | if ( !_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) ) { | |
346 | DRM_ERROR( "Lock isn't held after context switch\n" ); | |
347 | } | |
348 | ||
349 | /* If a context switch is ever initiated | |
350 | when the kernel holds the lock, release | |
351 | that lock here. */ | |
352 | clear_bit( 0, &dev->context_flag ); | |
353 | wake_up( &dev->context_wait ); | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | /** | |
359 | * Reserve contexts. | |
360 | * | |
361 | * \param inode device inode. | |
362 | * \param filp file pointer. | |
363 | * \param cmd command. | |
364 | * \param arg user argument pointing to a drm_ctx_res structure. | |
365 | * \return zero on success or a negative number on failure. | |
366 | */ | |
367 | int drm_resctx( struct inode *inode, struct file *filp, | |
368 | unsigned int cmd, unsigned long arg ) | |
369 | { | |
370 | drm_ctx_res_t res; | |
371 | drm_ctx_t __user *argp = (void __user *)arg; | |
372 | drm_ctx_t ctx; | |
373 | int i; | |
374 | ||
375 | if ( copy_from_user( &res, argp, sizeof(res) ) ) | |
376 | return -EFAULT; | |
377 | ||
378 | if ( res.count >= DRM_RESERVED_CONTEXTS ) { | |
379 | memset( &ctx, 0, sizeof(ctx) ); | |
380 | for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) { | |
381 | ctx.handle = i; | |
382 | if ( copy_to_user( &res.contexts[i], | |
c73681e7 | 383 | &ctx, sizeof(ctx) ) ) |
1da177e4 LT |
384 | return -EFAULT; |
385 | } | |
386 | } | |
387 | res.count = DRM_RESERVED_CONTEXTS; | |
388 | ||
389 | if ( copy_to_user( argp, &res, sizeof(res) ) ) | |
390 | return -EFAULT; | |
391 | return 0; | |
392 | } | |
393 | ||
394 | /** | |
395 | * Add context. | |
396 | * | |
397 | * \param inode device inode. | |
398 | * \param filp file pointer. | |
399 | * \param cmd command. | |
400 | * \param arg user argument pointing to a drm_ctx structure. | |
401 | * \return zero on success or a negative number on failure. | |
402 | * | |
403 | * Get a new handle for the context and copy to userspace. | |
404 | */ | |
405 | int drm_addctx( struct inode *inode, struct file *filp, | |
406 | unsigned int cmd, unsigned long arg ) | |
407 | { | |
408 | drm_file_t *priv = filp->private_data; | |
409 | drm_device_t *dev = priv->head->dev; | |
410 | drm_ctx_list_t * ctx_entry; | |
411 | drm_ctx_t __user *argp = (void __user *)arg; | |
412 | drm_ctx_t ctx; | |
413 | ||
414 | if ( copy_from_user( &ctx, argp, sizeof(ctx) ) ) | |
415 | return -EFAULT; | |
416 | ||
417 | ctx.handle = drm_ctxbitmap_next( dev ); | |
418 | if ( ctx.handle == DRM_KERNEL_CONTEXT ) { | |
419 | /* Skip kernel's context and get a new one. */ | |
420 | ctx.handle = drm_ctxbitmap_next( dev ); | |
421 | } | |
422 | DRM_DEBUG( "%d\n", ctx.handle ); | |
423 | if ( ctx.handle == -1 ) { | |
424 | DRM_DEBUG( "Not enough free contexts.\n" ); | |
425 | /* Should this return -EBUSY instead? */ | |
426 | return -ENOMEM; | |
427 | } | |
428 | ||
429 | if ( ctx.handle != DRM_KERNEL_CONTEXT ) | |
430 | { | |
431 | if (dev->driver->context_ctor) | |
432 | dev->driver->context_ctor(dev, ctx.handle); | |
433 | } | |
434 | ||
435 | ctx_entry = drm_alloc( sizeof(*ctx_entry), DRM_MEM_CTXLIST ); | |
436 | if ( !ctx_entry ) { | |
437 | DRM_DEBUG("out of memory\n"); | |
438 | return -ENOMEM; | |
439 | } | |
440 | ||
441 | INIT_LIST_HEAD( &ctx_entry->head ); | |
442 | ctx_entry->handle = ctx.handle; | |
443 | ctx_entry->tag = priv; | |
444 | ||
445 | down( &dev->ctxlist_sem ); | |
446 | list_add( &ctx_entry->head, &dev->ctxlist->head ); | |
447 | ++dev->ctx_count; | |
448 | up( &dev->ctxlist_sem ); | |
449 | ||
450 | if ( copy_to_user( argp, &ctx, sizeof(ctx) ) ) | |
451 | return -EFAULT; | |
452 | return 0; | |
453 | } | |
454 | ||
455 | int drm_modctx( struct inode *inode, struct file *filp, | |
456 | unsigned int cmd, unsigned long arg ) | |
457 | { | |
458 | /* This does nothing */ | |
459 | return 0; | |
460 | } | |
461 | ||
462 | /** | |
463 | * Get context. | |
464 | * | |
465 | * \param inode device inode. | |
466 | * \param filp file pointer. | |
467 | * \param cmd command. | |
468 | * \param arg user argument pointing to a drm_ctx structure. | |
469 | * \return zero on success or a negative number on failure. | |
470 | */ | |
471 | int drm_getctx( struct inode *inode, struct file *filp, | |
472 | unsigned int cmd, unsigned long arg ) | |
473 | { | |
474 | drm_ctx_t __user *argp = (void __user *)arg; | |
475 | drm_ctx_t ctx; | |
476 | ||
477 | if ( copy_from_user( &ctx, argp, sizeof(ctx) ) ) | |
478 | return -EFAULT; | |
479 | ||
480 | /* This is 0, because we don't handle any context flags */ | |
481 | ctx.flags = 0; | |
482 | ||
483 | if ( copy_to_user( argp, &ctx, sizeof(ctx) ) ) | |
484 | return -EFAULT; | |
485 | return 0; | |
486 | } | |
487 | ||
488 | /** | |
489 | * Switch context. | |
490 | * | |
491 | * \param inode device inode. | |
492 | * \param filp file pointer. | |
493 | * \param cmd command. | |
494 | * \param arg user argument pointing to a drm_ctx structure. | |
495 | * \return zero on success or a negative number on failure. | |
496 | * | |
497 | * Calls context_switch(). | |
498 | */ | |
499 | int drm_switchctx( struct inode *inode, struct file *filp, | |
500 | unsigned int cmd, unsigned long arg ) | |
501 | { | |
502 | drm_file_t *priv = filp->private_data; | |
503 | drm_device_t *dev = priv->head->dev; | |
504 | drm_ctx_t ctx; | |
505 | ||
506 | if ( copy_from_user( &ctx, (drm_ctx_t __user *)arg, sizeof(ctx) ) ) | |
507 | return -EFAULT; | |
508 | ||
509 | DRM_DEBUG( "%d\n", ctx.handle ); | |
510 | return drm_context_switch( dev, dev->last_context, ctx.handle ); | |
511 | } | |
512 | ||
513 | /** | |
514 | * New context. | |
515 | * | |
516 | * \param inode device inode. | |
517 | * \param filp file pointer. | |
518 | * \param cmd command. | |
519 | * \param arg user argument pointing to a drm_ctx structure. | |
520 | * \return zero on success or a negative number on failure. | |
521 | * | |
522 | * Calls context_switch_complete(). | |
523 | */ | |
524 | int drm_newctx( struct inode *inode, struct file *filp, | |
525 | unsigned int cmd, unsigned long arg ) | |
526 | { | |
527 | drm_file_t *priv = filp->private_data; | |
528 | drm_device_t *dev = priv->head->dev; | |
529 | drm_ctx_t ctx; | |
530 | ||
531 | if ( copy_from_user( &ctx, (drm_ctx_t __user *)arg, sizeof(ctx) ) ) | |
532 | return -EFAULT; | |
533 | ||
534 | DRM_DEBUG( "%d\n", ctx.handle ); | |
535 | drm_context_switch_complete( dev, ctx.handle ); | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
540 | /** | |
541 | * Remove context. | |
542 | * | |
543 | * \param inode device inode. | |
544 | * \param filp file pointer. | |
545 | * \param cmd command. | |
546 | * \param arg user argument pointing to a drm_ctx structure. | |
547 | * \return zero on success or a negative number on failure. | |
548 | * | |
549 | * If not the special kernel context, calls ctxbitmap_free() to free the specified context. | |
550 | */ | |
551 | int drm_rmctx( struct inode *inode, struct file *filp, | |
552 | unsigned int cmd, unsigned long arg ) | |
553 | { | |
554 | drm_file_t *priv = filp->private_data; | |
555 | drm_device_t *dev = priv->head->dev; | |
556 | drm_ctx_t ctx; | |
557 | ||
558 | if ( copy_from_user( &ctx, (drm_ctx_t __user *)arg, sizeof(ctx) ) ) | |
559 | return -EFAULT; | |
560 | ||
561 | DRM_DEBUG( "%d\n", ctx.handle ); | |
562 | if ( ctx.handle == DRM_KERNEL_CONTEXT + 1 ) { | |
563 | priv->remove_auth_on_close = 1; | |
564 | } | |
565 | if ( ctx.handle != DRM_KERNEL_CONTEXT ) { | |
566 | if (dev->driver->context_dtor) | |
567 | dev->driver->context_dtor(dev, ctx.handle); | |
568 | drm_ctxbitmap_free( dev, ctx.handle ); | |
569 | } | |
570 | ||
571 | down( &dev->ctxlist_sem ); | |
572 | if ( !list_empty( &dev->ctxlist->head ) ) { | |
573 | drm_ctx_list_t *pos, *n; | |
574 | ||
575 | list_for_each_entry_safe( pos, n, &dev->ctxlist->head, head ) { | |
576 | if ( pos->handle == ctx.handle ) { | |
577 | list_del( &pos->head ); | |
578 | drm_free( pos, sizeof(*pos), DRM_MEM_CTXLIST ); | |
579 | --dev->ctx_count; | |
580 | } | |
581 | } | |
582 | } | |
583 | up( &dev->ctxlist_sem ); | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
588 | /*@}*/ | |
589 |