1 /******************************************************************************
2 *
3 * Module Name: exmutex - ASL Mutex Acquire/Release functions
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2016, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include "acpi.h"
45 #include "accommon.h"
46 #include "acinterp.h"
47 #include "acevents.h"
48
49 #define _COMPONENT ACPI_EXECUTER
50 ACPI_MODULE_NAME ("exmutex")
51
52 /* Local prototypes */
53
54 static void
55 AcpiExLinkMutex (
56 ACPI_OPERAND_OBJECT *ObjDesc,
57 ACPI_THREAD_STATE *Thread);
58
59
60 /*******************************************************************************
61 *
62 * FUNCTION: AcpiExUnlinkMutex
63 *
64 * PARAMETERS: ObjDesc - The mutex to be unlinked
65 *
66 * RETURN: None
67 *
68 * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
69 *
70 ******************************************************************************/
71
72 void
AcpiExUnlinkMutex(ACPI_OPERAND_OBJECT * ObjDesc)73 AcpiExUnlinkMutex (
74 ACPI_OPERAND_OBJECT *ObjDesc)
75 {
76 ACPI_THREAD_STATE *Thread = ObjDesc->Mutex.OwnerThread;
77
78
79 if (!Thread)
80 {
81 return;
82 }
83
84 /* Doubly linked list */
85
86 if (ObjDesc->Mutex.Next)
87 {
88 (ObjDesc->Mutex.Next)->Mutex.Prev = ObjDesc->Mutex.Prev;
89 }
90
91 if (ObjDesc->Mutex.Prev)
92 {
93 (ObjDesc->Mutex.Prev)->Mutex.Next = ObjDesc->Mutex.Next;
94
95 /*
96 * Migrate the previous sync level associated with this mutex to
97 * the previous mutex on the list so that it may be preserved.
98 * This handles the case where several mutexes have been acquired
99 * at the same level, but are not released in opposite order.
100 */
101 (ObjDesc->Mutex.Prev)->Mutex.OriginalSyncLevel =
102 ObjDesc->Mutex.OriginalSyncLevel;
103 }
104 else
105 {
106 Thread->AcquiredMutexList = ObjDesc->Mutex.Next;
107 }
108 }
109
110
111 /*******************************************************************************
112 *
113 * FUNCTION: AcpiExLinkMutex
114 *
115 * PARAMETERS: ObjDesc - The mutex to be linked
116 * Thread - Current executing thread object
117 *
118 * RETURN: None
119 *
120 * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
121 *
122 ******************************************************************************/
123
124 static void
AcpiExLinkMutex(ACPI_OPERAND_OBJECT * ObjDesc,ACPI_THREAD_STATE * Thread)125 AcpiExLinkMutex (
126 ACPI_OPERAND_OBJECT *ObjDesc,
127 ACPI_THREAD_STATE *Thread)
128 {
129 ACPI_OPERAND_OBJECT *ListHead;
130
131
132 ListHead = Thread->AcquiredMutexList;
133
134 /* This object will be the first object in the list */
135
136 ObjDesc->Mutex.Prev = NULL;
137 ObjDesc->Mutex.Next = ListHead;
138
139 /* Update old first object to point back to this object */
140
141 if (ListHead)
142 {
143 ListHead->Mutex.Prev = ObjDesc;
144 }
145
146 /* Update list head */
147
148 Thread->AcquiredMutexList = ObjDesc;
149 }
150
151
152 /*******************************************************************************
153 *
154 * FUNCTION: AcpiExAcquireMutexObject
155 *
156 * PARAMETERS: Timeout - Timeout in milliseconds
157 * ObjDesc - Mutex object
158 * ThreadId - Current thread state
159 *
160 * RETURN: Status
161 *
162 * DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common
163 * path that supports multiple acquires by the same thread.
164 *
165 * MUTEX: Interpreter must be locked
166 *
167 * NOTE: This interface is called from three places:
168 * 1) From AcpiExAcquireMutex, via an AML Acquire() operator
169 * 2) From AcpiExAcquireGlobalLock when an AML Field access requires the
170 * global lock
171 * 3) From the external interface, AcpiAcquireGlobalLock
172 *
173 ******************************************************************************/
174
175 ACPI_STATUS
AcpiExAcquireMutexObject(UINT16 Timeout,ACPI_OPERAND_OBJECT * ObjDesc,ACPI_THREAD_ID ThreadId)176 AcpiExAcquireMutexObject (
177 UINT16 Timeout,
178 ACPI_OPERAND_OBJECT *ObjDesc,
179 ACPI_THREAD_ID ThreadId)
180 {
181 ACPI_STATUS Status;
182
183
184 ACPI_FUNCTION_TRACE_PTR (ExAcquireMutexObject, ObjDesc);
185
186
187 if (!ObjDesc)
188 {
189 return_ACPI_STATUS (AE_BAD_PARAMETER);
190 }
191
192 /* Support for multiple acquires by the owning thread */
193
194 if (ObjDesc->Mutex.ThreadId == ThreadId)
195 {
196 /*
197 * The mutex is already owned by this thread, just increment the
198 * acquisition depth
199 */
200 ObjDesc->Mutex.AcquisitionDepth++;
201 return_ACPI_STATUS (AE_OK);
202 }
203
204 /* Acquire the mutex, wait if necessary. Special case for Global Lock */
205
206 if (ObjDesc == AcpiGbl_GlobalLockMutex)
207 {
208 Status = AcpiEvAcquireGlobalLock (Timeout);
209 }
210 else
211 {
212 Status = AcpiExSystemWaitMutex (ObjDesc->Mutex.OsMutex, Timeout);
213 }
214
215 if (ACPI_FAILURE (Status))
216 {
217 /* Includes failure from a timeout on TimeDesc */
218
219 return_ACPI_STATUS (Status);
220 }
221
222 /* Acquired the mutex: update mutex object */
223
224 ObjDesc->Mutex.ThreadId = ThreadId;
225 ObjDesc->Mutex.AcquisitionDepth = 1;
226 ObjDesc->Mutex.OriginalSyncLevel = 0;
227 ObjDesc->Mutex.OwnerThread = NULL; /* Used only for AML Acquire() */
228
229 return_ACPI_STATUS (AE_OK);
230 }
231
232
233 /*******************************************************************************
234 *
235 * FUNCTION: AcpiExAcquireMutex
236 *
237 * PARAMETERS: TimeDesc - Timeout integer
238 * ObjDesc - Mutex object
239 * WalkState - Current method execution state
240 *
241 * RETURN: Status
242 *
243 * DESCRIPTION: Acquire an AML mutex
244 *
245 ******************************************************************************/
246
247 ACPI_STATUS
AcpiExAcquireMutex(ACPI_OPERAND_OBJECT * TimeDesc,ACPI_OPERAND_OBJECT * ObjDesc,ACPI_WALK_STATE * WalkState)248 AcpiExAcquireMutex (
249 ACPI_OPERAND_OBJECT *TimeDesc,
250 ACPI_OPERAND_OBJECT *ObjDesc,
251 ACPI_WALK_STATE *WalkState)
252 {
253 ACPI_STATUS Status;
254
255
256 ACPI_FUNCTION_TRACE_PTR (ExAcquireMutex, ObjDesc);
257
258
259 if (!ObjDesc)
260 {
261 return_ACPI_STATUS (AE_BAD_PARAMETER);
262 }
263
264 /* Must have a valid thread state struct */
265
266 if (!WalkState->Thread)
267 {
268 ACPI_ERROR ((AE_INFO,
269 "Cannot acquire Mutex [%4.4s], null thread info",
270 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
271 return_ACPI_STATUS (AE_AML_INTERNAL);
272 }
273
274 /*
275 * Current sync level must be less than or equal to the sync level
276 * of the mutex. This mechanism provides some deadlock prevention.
277 */
278 if (WalkState->Thread->CurrentSyncLevel > ObjDesc->Mutex.SyncLevel)
279 {
280 ACPI_ERROR ((AE_INFO,
281 "Cannot acquire Mutex [%4.4s], "
282 "current SyncLevel is too large (%u)",
283 AcpiUtGetNodeName (ObjDesc->Mutex.Node),
284 WalkState->Thread->CurrentSyncLevel));
285 return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
286 }
287
288 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
289 "Acquiring: Mutex SyncLevel %u, Thread SyncLevel %u, "
290 "Depth %u TID %p\n",
291 ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
292 ObjDesc->Mutex.AcquisitionDepth, WalkState->Thread));
293
294 Status = AcpiExAcquireMutexObject ((UINT16) TimeDesc->Integer.Value,
295 ObjDesc, WalkState->Thread->ThreadId);
296
297 if (ACPI_SUCCESS (Status) && ObjDesc->Mutex.AcquisitionDepth == 1)
298 {
299 /* Save Thread object, original/current sync levels */
300
301 ObjDesc->Mutex.OwnerThread = WalkState->Thread;
302 ObjDesc->Mutex.OriginalSyncLevel =
303 WalkState->Thread->CurrentSyncLevel;
304 WalkState->Thread->CurrentSyncLevel =
305 ObjDesc->Mutex.SyncLevel;
306
307 /* Link the mutex to the current thread for force-unlock at method exit */
308
309 AcpiExLinkMutex (ObjDesc, WalkState->Thread);
310 }
311
312 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
313 "Acquired: Mutex SyncLevel %u, Thread SyncLevel %u, Depth %u\n",
314 ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
315 ObjDesc->Mutex.AcquisitionDepth));
316
317 return_ACPI_STATUS (Status);
318 }
319
320
321 /*******************************************************************************
322 *
323 * FUNCTION: AcpiExReleaseMutexObject
324 *
325 * PARAMETERS: ObjDesc - The object descriptor for this op
326 *
327 * RETURN: Status
328 *
329 * DESCRIPTION: Release a previously acquired Mutex, low level interface.
330 * Provides a common path that supports multiple releases (after
331 * previous multiple acquires) by the same thread.
332 *
333 * MUTEX: Interpreter must be locked
334 *
335 * NOTE: This interface is called from three places:
336 * 1) From AcpiExReleaseMutex, via an AML Acquire() operator
337 * 2) From AcpiExReleaseGlobalLock when an AML Field access requires the
338 * global lock
339 * 3) From the external interface, AcpiReleaseGlobalLock
340 *
341 ******************************************************************************/
342
343 ACPI_STATUS
AcpiExReleaseMutexObject(ACPI_OPERAND_OBJECT * ObjDesc)344 AcpiExReleaseMutexObject (
345 ACPI_OPERAND_OBJECT *ObjDesc)
346 {
347 ACPI_STATUS Status = AE_OK;
348
349
350 ACPI_FUNCTION_TRACE (ExReleaseMutexObject);
351
352
353 if (ObjDesc->Mutex.AcquisitionDepth == 0)
354 {
355 return_ACPI_STATUS (AE_NOT_ACQUIRED);
356 }
357
358 /* Match multiple Acquires with multiple Releases */
359
360 ObjDesc->Mutex.AcquisitionDepth--;
361 if (ObjDesc->Mutex.AcquisitionDepth != 0)
362 {
363 /* Just decrement the depth and return */
364
365 return_ACPI_STATUS (AE_OK);
366 }
367
368 if (ObjDesc->Mutex.OwnerThread)
369 {
370 /* Unlink the mutex from the owner's list */
371
372 AcpiExUnlinkMutex (ObjDesc);
373 ObjDesc->Mutex.OwnerThread = NULL;
374 }
375
376 /* Release the mutex, special case for Global Lock */
377
378 if (ObjDesc == AcpiGbl_GlobalLockMutex)
379 {
380 Status = AcpiEvReleaseGlobalLock ();
381 }
382 else
383 {
384 AcpiOsReleaseMutex (ObjDesc->Mutex.OsMutex);
385 }
386
387 /* Clear mutex info */
388
389 ObjDesc->Mutex.ThreadId = 0;
390 return_ACPI_STATUS (Status);
391 }
392
393
394 /*******************************************************************************
395 *
396 * FUNCTION: AcpiExReleaseMutex
397 *
398 * PARAMETERS: ObjDesc - The object descriptor for this op
399 * WalkState - Current method execution state
400 *
401 * RETURN: Status
402 *
403 * DESCRIPTION: Release a previously acquired Mutex.
404 *
405 ******************************************************************************/
406
407 ACPI_STATUS
AcpiExReleaseMutex(ACPI_OPERAND_OBJECT * ObjDesc,ACPI_WALK_STATE * WalkState)408 AcpiExReleaseMutex (
409 ACPI_OPERAND_OBJECT *ObjDesc,
410 ACPI_WALK_STATE *WalkState)
411 {
412 UINT8 PreviousSyncLevel;
413 ACPI_THREAD_STATE *OwnerThread;
414 ACPI_STATUS Status = AE_OK;
415
416
417 ACPI_FUNCTION_TRACE (ExReleaseMutex);
418
419
420 if (!ObjDesc)
421 {
422 return_ACPI_STATUS (AE_BAD_PARAMETER);
423 }
424
425 OwnerThread = ObjDesc->Mutex.OwnerThread;
426
427 /* The mutex must have been previously acquired in order to release it */
428
429 if (!OwnerThread)
430 {
431 ACPI_ERROR ((AE_INFO,
432 "Cannot release Mutex [%4.4s], not acquired",
433 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
434 return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED);
435 }
436
437 /* Must have a valid thread ID */
438
439 if (!WalkState->Thread)
440 {
441 ACPI_ERROR ((AE_INFO,
442 "Cannot release Mutex [%4.4s], null thread info",
443 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
444 return_ACPI_STATUS (AE_AML_INTERNAL);
445 }
446
447 /*
448 * The Mutex is owned, but this thread must be the owner.
449 * Special case for Global Lock, any thread can release
450 */
451 if ((OwnerThread->ThreadId != WalkState->Thread->ThreadId) &&
452 (ObjDesc != AcpiGbl_GlobalLockMutex))
453 {
454 ACPI_ERROR ((AE_INFO,
455 "Thread %u cannot release Mutex [%4.4s] acquired by thread %u",
456 (UINT32) WalkState->Thread->ThreadId,
457 AcpiUtGetNodeName (ObjDesc->Mutex.Node),
458 (UINT32) OwnerThread->ThreadId));
459 return_ACPI_STATUS (AE_AML_NOT_OWNER);
460 }
461
462 /*
463 * The sync level of the mutex must be equal to the current sync level. In
464 * other words, the current level means that at least one mutex at that
465 * level is currently being held. Attempting to release a mutex of a
466 * different level can only mean that the mutex ordering rule is being
467 * violated. This behavior is clarified in ACPI 4.0 specification.
468 */
469 if (ObjDesc->Mutex.SyncLevel != OwnerThread->CurrentSyncLevel)
470 {
471 ACPI_ERROR ((AE_INFO,
472 "Cannot release Mutex [%4.4s], SyncLevel mismatch: "
473 "mutex %u current %u",
474 AcpiUtGetNodeName (ObjDesc->Mutex.Node),
475 ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel));
476 return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
477 }
478
479 /*
480 * Get the previous SyncLevel from the head of the acquired mutex list.
481 * This handles the case where several mutexes at the same level have been
482 * acquired, but are not released in reverse order.
483 */
484 PreviousSyncLevel =
485 OwnerThread->AcquiredMutexList->Mutex.OriginalSyncLevel;
486
487 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
488 "Releasing: Object SyncLevel %u, Thread SyncLevel %u, "
489 "Prev SyncLevel %u, Depth %u TID %p\n",
490 ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
491 PreviousSyncLevel, ObjDesc->Mutex.AcquisitionDepth,
492 WalkState->Thread));
493
494 Status = AcpiExReleaseMutexObject (ObjDesc);
495 if (ACPI_FAILURE (Status))
496 {
497 return_ACPI_STATUS (Status);
498 }
499
500 if (ObjDesc->Mutex.AcquisitionDepth == 0)
501 {
502 /* Restore the previous SyncLevel */
503
504 OwnerThread->CurrentSyncLevel = PreviousSyncLevel;
505 }
506
507 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
508 "Released: Object SyncLevel %u, Thread SyncLevel, %u, "
509 "Prev SyncLevel %u, Depth %u\n",
510 ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
511 PreviousSyncLevel, ObjDesc->Mutex.AcquisitionDepth));
512
513 return_ACPI_STATUS (Status);
514 }
515
516
517 /*******************************************************************************
518 *
519 * FUNCTION: AcpiExReleaseAllMutexes
520 *
521 * PARAMETERS: Thread - Current executing thread object
522 *
523 * RETURN: Status
524 *
525 * DESCRIPTION: Release all mutexes held by this thread
526 *
527 * NOTE: This function is called as the thread is exiting the interpreter.
528 * Mutexes are not released when an individual control method is exited, but
529 * only when the parent thread actually exits the interpreter. This allows one
530 * method to acquire a mutex, and a different method to release it, as long as
531 * this is performed underneath a single parent control method.
532 *
533 ******************************************************************************/
534
535 void
AcpiExReleaseAllMutexes(ACPI_THREAD_STATE * Thread)536 AcpiExReleaseAllMutexes (
537 ACPI_THREAD_STATE *Thread)
538 {
539 ACPI_OPERAND_OBJECT *Next = Thread->AcquiredMutexList;
540 ACPI_OPERAND_OBJECT *ObjDesc;
541
542
543 ACPI_FUNCTION_TRACE (ExReleaseAllMutexes);
544
545
546 /* Traverse the list of owned mutexes, releasing each one */
547
548 while (Next)
549 {
550 ObjDesc = Next;
551 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
552 "Mutex [%4.4s] force-release, SyncLevel %u Depth %u\n",
553 ObjDesc->Mutex.Node->Name.Ascii, ObjDesc->Mutex.SyncLevel,
554 ObjDesc->Mutex.AcquisitionDepth));
555
556 /* Release the mutex, special case for Global Lock */
557
558 if (ObjDesc == AcpiGbl_GlobalLockMutex)
559 {
560 /* Ignore errors */
561
562 (void) AcpiEvReleaseGlobalLock ();
563 }
564 else
565 {
566 AcpiOsReleaseMutex (ObjDesc->Mutex.OsMutex);
567 }
568
569 /* Update Thread SyncLevel (Last mutex is the important one) */
570
571 Thread->CurrentSyncLevel = ObjDesc->Mutex.OriginalSyncLevel;
572
573 /* Mark mutex unowned */
574
575 Next = ObjDesc->Mutex.Next;
576
577 ObjDesc->Mutex.Prev = NULL;
578 ObjDesc->Mutex.Next = NULL;
579 ObjDesc->Mutex.AcquisitionDepth = 0;
580 ObjDesc->Mutex.OwnerThread = NULL;
581 ObjDesc->Mutex.ThreadId = 0;
582 }
583
584 return_VOID;
585 }
586