1/*******************************************************************************
2 *
3 * Module Name: utmutex - local mutex support
4 *
5 ******************************************************************************/
6
| 1/*******************************************************************************
2 *
3 * Module Name: utmutex - local mutex support
4 *
5 ******************************************************************************/
6
|
7/******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
| 7/*
8 * Copyright (C) 2000 - 2011, Intel Corp.
|
12 * All rights reserved.
13 *
| 9 * All rights reserved.
10 *
|
14 * 2. License
| 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.
|
15 *
| 25 *
|
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
| 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.
|
20 *
| 29 *
|
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************/
| 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 */
|
115
116
117#define __UTMUTEX_C__
118
119#include <contrib/dev/acpica/include/acpi.h>
120#include <contrib/dev/acpica/include/accommon.h>
121
122#define _COMPONENT ACPI_UTILITIES
123 ACPI_MODULE_NAME ("utmutex")
124
125/* Local prototypes */
126
127static ACPI_STATUS
128AcpiUtCreateMutex (
129 ACPI_MUTEX_HANDLE MutexId);
130
131static void
132AcpiUtDeleteMutex (
133 ACPI_MUTEX_HANDLE MutexId);
134
135
136/*******************************************************************************
137 *
138 * FUNCTION: AcpiUtMutexInitialize
139 *
140 * PARAMETERS: None.
141 *
142 * RETURN: Status
143 *
144 * DESCRIPTION: Create the system mutex objects. This includes mutexes,
145 * spin locks, and reader/writer locks.
146 *
147 ******************************************************************************/
148
149ACPI_STATUS
150AcpiUtMutexInitialize (
151 void)
152{
153 UINT32 i;
154 ACPI_STATUS Status;
155
156
157 ACPI_FUNCTION_TRACE (UtMutexInitialize);
158
159
160 /* Create each of the predefined mutex objects */
161
162 for (i = 0; i < ACPI_NUM_MUTEX; i++)
163 {
164 Status = AcpiUtCreateMutex (i);
165 if (ACPI_FAILURE (Status))
166 {
167 return_ACPI_STATUS (Status);
168 }
169 }
170
171 /* Create the spinlocks for use at interrupt level */
172
173 Status = AcpiOsCreateLock (&AcpiGbl_GpeLock);
174 if (ACPI_FAILURE (Status))
175 {
176 return_ACPI_STATUS (Status);
177 }
178
179 Status = AcpiOsCreateLock (&AcpiGbl_HardwareLock);
180 if (ACPI_FAILURE (Status))
181 {
182 return_ACPI_STATUS (Status);
183 }
184
185 /* Mutex for _OSI support */
186 Status = AcpiOsCreateMutex (&AcpiGbl_OsiMutex);
187 if (ACPI_FAILURE (Status))
188 {
189 return_ACPI_STATUS (Status);
190 }
191
192 /* Create the reader/writer lock for namespace access */
193
194 Status = AcpiUtCreateRwLock (&AcpiGbl_NamespaceRwLock);
195 return_ACPI_STATUS (Status);
196}
197
198
199/*******************************************************************************
200 *
201 * FUNCTION: AcpiUtMutexTerminate
202 *
203 * PARAMETERS: None.
204 *
205 * RETURN: None.
206 *
207 * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
208 * spin locks, and reader/writer locks.
209 *
210 ******************************************************************************/
211
212void
213AcpiUtMutexTerminate (
214 void)
215{
216 UINT32 i;
217
218
219 ACPI_FUNCTION_TRACE (UtMutexTerminate);
220
221
222 /* Delete each predefined mutex object */
223
224 for (i = 0; i < ACPI_NUM_MUTEX; i++)
225 {
226 AcpiUtDeleteMutex (i);
227 }
228
229 AcpiOsDeleteMutex (AcpiGbl_OsiMutex);
230
231 /* Delete the spinlocks */
232
233 AcpiOsDeleteLock (AcpiGbl_GpeLock);
234 AcpiOsDeleteLock (AcpiGbl_HardwareLock);
235
236 /* Delete the reader/writer lock */
237
238 AcpiUtDeleteRwLock (&AcpiGbl_NamespaceRwLock);
239 return_VOID;
240}
241
242
243/*******************************************************************************
244 *
245 * FUNCTION: AcpiUtCreateMutex
246 *
247 * PARAMETERS: MutexID - ID of the mutex to be created
248 *
249 * RETURN: Status
250 *
251 * DESCRIPTION: Create a mutex object.
252 *
253 ******************************************************************************/
254
255static ACPI_STATUS
256AcpiUtCreateMutex (
257 ACPI_MUTEX_HANDLE MutexId)
258{
259 ACPI_STATUS Status = AE_OK;
260
261
262 ACPI_FUNCTION_TRACE_U32 (UtCreateMutex, MutexId);
263
264
265 if (!AcpiGbl_MutexInfo[MutexId].Mutex)
266 {
267 Status = AcpiOsCreateMutex (&AcpiGbl_MutexInfo[MutexId].Mutex);
268 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
269 AcpiGbl_MutexInfo[MutexId].UseCount = 0;
270 }
271
272 return_ACPI_STATUS (Status);
273}
274
275
276/*******************************************************************************
277 *
278 * FUNCTION: AcpiUtDeleteMutex
279 *
280 * PARAMETERS: MutexID - ID of the mutex to be deleted
281 *
282 * RETURN: Status
283 *
284 * DESCRIPTION: Delete a mutex object.
285 *
286 ******************************************************************************/
287
288static void
289AcpiUtDeleteMutex (
290 ACPI_MUTEX_HANDLE MutexId)
291{
292
293 ACPI_FUNCTION_TRACE_U32 (UtDeleteMutex, MutexId);
294
295
296 AcpiOsDeleteMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
297
298 AcpiGbl_MutexInfo[MutexId].Mutex = NULL;
299 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
300}
301
302
303/*******************************************************************************
304 *
305 * FUNCTION: AcpiUtAcquireMutex
306 *
307 * PARAMETERS: MutexID - ID of the mutex to be acquired
308 *
309 * RETURN: Status
310 *
311 * DESCRIPTION: Acquire a mutex object.
312 *
313 ******************************************************************************/
314
315ACPI_STATUS
316AcpiUtAcquireMutex (
317 ACPI_MUTEX_HANDLE MutexId)
318{
319 ACPI_STATUS Status;
320 ACPI_THREAD_ID ThisThreadId;
321
322
323 ACPI_FUNCTION_NAME (UtAcquireMutex);
324
325
326 if (MutexId > ACPI_MAX_MUTEX)
327 {
328 return (AE_BAD_PARAMETER);
329 }
330
331 ThisThreadId = AcpiOsGetThreadId ();
332
333#ifdef ACPI_MUTEX_DEBUG
334 {
335 UINT32 i;
336 /*
337 * Mutex debug code, for internal debugging only.
338 *
339 * Deadlock prevention. Check if this thread owns any mutexes of value
340 * greater than or equal to this one. If so, the thread has violated
341 * the mutex ordering rule. This indicates a coding error somewhere in
342 * the ACPI subsystem code.
343 */
344 for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
345 {
346 if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
347 {
348 if (i == MutexId)
349 {
350 ACPI_ERROR ((AE_INFO,
351 "Mutex [%s] already acquired by this thread [%u]",
352 AcpiUtGetMutexName (MutexId),
353 (UINT32) ThisThreadId));
354
355 return (AE_ALREADY_ACQUIRED);
356 }
357
358 ACPI_ERROR ((AE_INFO,
359 "Invalid acquire order: Thread %u owns [%s], wants [%s]",
360 (UINT32) ThisThreadId, AcpiUtGetMutexName (i),
361 AcpiUtGetMutexName (MutexId)));
362
363 return (AE_ACQUIRE_DEADLOCK);
364 }
365 }
366 }
367#endif
368
369 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
370 "Thread %u attempting to acquire Mutex [%s]\n",
371 (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
372
373 Status = AcpiOsAcquireMutex (AcpiGbl_MutexInfo[MutexId].Mutex,
374 ACPI_WAIT_FOREVER);
375 if (ACPI_SUCCESS (Status))
376 {
377 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u acquired Mutex [%s]\n",
378 (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
379
380 AcpiGbl_MutexInfo[MutexId].UseCount++;
381 AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId;
382 }
383 else
384 {
385 ACPI_EXCEPTION ((AE_INFO, Status,
386 "Thread %u could not acquire Mutex [0x%X]",
387 (UINT32) ThisThreadId, MutexId));
388 }
389
390 return (Status);
391}
392
393
394/*******************************************************************************
395 *
396 * FUNCTION: AcpiUtReleaseMutex
397 *
398 * PARAMETERS: MutexID - ID of the mutex to be released
399 *
400 * RETURN: Status
401 *
402 * DESCRIPTION: Release a mutex object.
403 *
404 ******************************************************************************/
405
406ACPI_STATUS
407AcpiUtReleaseMutex (
408 ACPI_MUTEX_HANDLE MutexId)
409{
410 ACPI_THREAD_ID ThisThreadId;
411
412
413 ACPI_FUNCTION_NAME (UtReleaseMutex);
414
415
416 ThisThreadId = AcpiOsGetThreadId ();
417 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
418 (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
419
420 if (MutexId > ACPI_MAX_MUTEX)
421 {
422 return (AE_BAD_PARAMETER);
423 }
424
425 /*
426 * Mutex must be acquired in order to release it!
427 */
428 if (AcpiGbl_MutexInfo[MutexId].ThreadId == ACPI_MUTEX_NOT_ACQUIRED)
429 {
430 ACPI_ERROR ((AE_INFO,
431 "Mutex [0x%X] is not acquired, cannot release", MutexId));
432
433 return (AE_NOT_ACQUIRED);
434 }
435
436#ifdef ACPI_MUTEX_DEBUG
437 {
438 UINT32 i;
439 /*
440 * Mutex debug code, for internal debugging only.
441 *
442 * Deadlock prevention. Check if this thread owns any mutexes of value
443 * greater than this one. If so, the thread has violated the mutex
444 * ordering rule. This indicates a coding error somewhere in
445 * the ACPI subsystem code.
446 */
447 for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
448 {
449 if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
450 {
451 if (i == MutexId)
452 {
453 continue;
454 }
455
456 ACPI_ERROR ((AE_INFO,
457 "Invalid release order: owns [%s], releasing [%s]",
458 AcpiUtGetMutexName (i), AcpiUtGetMutexName (MutexId)));
459
460 return (AE_RELEASE_DEADLOCK);
461 }
462 }
463 }
464#endif
465
466 /* Mark unlocked FIRST */
467
468 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
469
470 AcpiOsReleaseMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
471 return (AE_OK);
472}
473
474
| 43
44
45#define __UTMUTEX_C__
46
47#include <contrib/dev/acpica/include/acpi.h>
48#include <contrib/dev/acpica/include/accommon.h>
49
50#define _COMPONENT ACPI_UTILITIES
51 ACPI_MODULE_NAME ("utmutex")
52
53/* Local prototypes */
54
55static ACPI_STATUS
56AcpiUtCreateMutex (
57 ACPI_MUTEX_HANDLE MutexId);
58
59static void
60AcpiUtDeleteMutex (
61 ACPI_MUTEX_HANDLE MutexId);
62
63
64/*******************************************************************************
65 *
66 * FUNCTION: AcpiUtMutexInitialize
67 *
68 * PARAMETERS: None.
69 *
70 * RETURN: Status
71 *
72 * DESCRIPTION: Create the system mutex objects. This includes mutexes,
73 * spin locks, and reader/writer locks.
74 *
75 ******************************************************************************/
76
77ACPI_STATUS
78AcpiUtMutexInitialize (
79 void)
80{
81 UINT32 i;
82 ACPI_STATUS Status;
83
84
85 ACPI_FUNCTION_TRACE (UtMutexInitialize);
86
87
88 /* Create each of the predefined mutex objects */
89
90 for (i = 0; i < ACPI_NUM_MUTEX; i++)
91 {
92 Status = AcpiUtCreateMutex (i);
93 if (ACPI_FAILURE (Status))
94 {
95 return_ACPI_STATUS (Status);
96 }
97 }
98
99 /* Create the spinlocks for use at interrupt level */
100
101 Status = AcpiOsCreateLock (&AcpiGbl_GpeLock);
102 if (ACPI_FAILURE (Status))
103 {
104 return_ACPI_STATUS (Status);
105 }
106
107 Status = AcpiOsCreateLock (&AcpiGbl_HardwareLock);
108 if (ACPI_FAILURE (Status))
109 {
110 return_ACPI_STATUS (Status);
111 }
112
113 /* Mutex for _OSI support */
114 Status = AcpiOsCreateMutex (&AcpiGbl_OsiMutex);
115 if (ACPI_FAILURE (Status))
116 {
117 return_ACPI_STATUS (Status);
118 }
119
120 /* Create the reader/writer lock for namespace access */
121
122 Status = AcpiUtCreateRwLock (&AcpiGbl_NamespaceRwLock);
123 return_ACPI_STATUS (Status);
124}
125
126
127/*******************************************************************************
128 *
129 * FUNCTION: AcpiUtMutexTerminate
130 *
131 * PARAMETERS: None.
132 *
133 * RETURN: None.
134 *
135 * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
136 * spin locks, and reader/writer locks.
137 *
138 ******************************************************************************/
139
140void
141AcpiUtMutexTerminate (
142 void)
143{
144 UINT32 i;
145
146
147 ACPI_FUNCTION_TRACE (UtMutexTerminate);
148
149
150 /* Delete each predefined mutex object */
151
152 for (i = 0; i < ACPI_NUM_MUTEX; i++)
153 {
154 AcpiUtDeleteMutex (i);
155 }
156
157 AcpiOsDeleteMutex (AcpiGbl_OsiMutex);
158
159 /* Delete the spinlocks */
160
161 AcpiOsDeleteLock (AcpiGbl_GpeLock);
162 AcpiOsDeleteLock (AcpiGbl_HardwareLock);
163
164 /* Delete the reader/writer lock */
165
166 AcpiUtDeleteRwLock (&AcpiGbl_NamespaceRwLock);
167 return_VOID;
168}
169
170
171/*******************************************************************************
172 *
173 * FUNCTION: AcpiUtCreateMutex
174 *
175 * PARAMETERS: MutexID - ID of the mutex to be created
176 *
177 * RETURN: Status
178 *
179 * DESCRIPTION: Create a mutex object.
180 *
181 ******************************************************************************/
182
183static ACPI_STATUS
184AcpiUtCreateMutex (
185 ACPI_MUTEX_HANDLE MutexId)
186{
187 ACPI_STATUS Status = AE_OK;
188
189
190 ACPI_FUNCTION_TRACE_U32 (UtCreateMutex, MutexId);
191
192
193 if (!AcpiGbl_MutexInfo[MutexId].Mutex)
194 {
195 Status = AcpiOsCreateMutex (&AcpiGbl_MutexInfo[MutexId].Mutex);
196 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
197 AcpiGbl_MutexInfo[MutexId].UseCount = 0;
198 }
199
200 return_ACPI_STATUS (Status);
201}
202
203
204/*******************************************************************************
205 *
206 * FUNCTION: AcpiUtDeleteMutex
207 *
208 * PARAMETERS: MutexID - ID of the mutex to be deleted
209 *
210 * RETURN: Status
211 *
212 * DESCRIPTION: Delete a mutex object.
213 *
214 ******************************************************************************/
215
216static void
217AcpiUtDeleteMutex (
218 ACPI_MUTEX_HANDLE MutexId)
219{
220
221 ACPI_FUNCTION_TRACE_U32 (UtDeleteMutex, MutexId);
222
223
224 AcpiOsDeleteMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
225
226 AcpiGbl_MutexInfo[MutexId].Mutex = NULL;
227 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
228}
229
230
231/*******************************************************************************
232 *
233 * FUNCTION: AcpiUtAcquireMutex
234 *
235 * PARAMETERS: MutexID - ID of the mutex to be acquired
236 *
237 * RETURN: Status
238 *
239 * DESCRIPTION: Acquire a mutex object.
240 *
241 ******************************************************************************/
242
243ACPI_STATUS
244AcpiUtAcquireMutex (
245 ACPI_MUTEX_HANDLE MutexId)
246{
247 ACPI_STATUS Status;
248 ACPI_THREAD_ID ThisThreadId;
249
250
251 ACPI_FUNCTION_NAME (UtAcquireMutex);
252
253
254 if (MutexId > ACPI_MAX_MUTEX)
255 {
256 return (AE_BAD_PARAMETER);
257 }
258
259 ThisThreadId = AcpiOsGetThreadId ();
260
261#ifdef ACPI_MUTEX_DEBUG
262 {
263 UINT32 i;
264 /*
265 * Mutex debug code, for internal debugging only.
266 *
267 * Deadlock prevention. Check if this thread owns any mutexes of value
268 * greater than or equal to this one. If so, the thread has violated
269 * the mutex ordering rule. This indicates a coding error somewhere in
270 * the ACPI subsystem code.
271 */
272 for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
273 {
274 if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
275 {
276 if (i == MutexId)
277 {
278 ACPI_ERROR ((AE_INFO,
279 "Mutex [%s] already acquired by this thread [%u]",
280 AcpiUtGetMutexName (MutexId),
281 (UINT32) ThisThreadId));
282
283 return (AE_ALREADY_ACQUIRED);
284 }
285
286 ACPI_ERROR ((AE_INFO,
287 "Invalid acquire order: Thread %u owns [%s], wants [%s]",
288 (UINT32) ThisThreadId, AcpiUtGetMutexName (i),
289 AcpiUtGetMutexName (MutexId)));
290
291 return (AE_ACQUIRE_DEADLOCK);
292 }
293 }
294 }
295#endif
296
297 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
298 "Thread %u attempting to acquire Mutex [%s]\n",
299 (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
300
301 Status = AcpiOsAcquireMutex (AcpiGbl_MutexInfo[MutexId].Mutex,
302 ACPI_WAIT_FOREVER);
303 if (ACPI_SUCCESS (Status))
304 {
305 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u acquired Mutex [%s]\n",
306 (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
307
308 AcpiGbl_MutexInfo[MutexId].UseCount++;
309 AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId;
310 }
311 else
312 {
313 ACPI_EXCEPTION ((AE_INFO, Status,
314 "Thread %u could not acquire Mutex [0x%X]",
315 (UINT32) ThisThreadId, MutexId));
316 }
317
318 return (Status);
319}
320
321
322/*******************************************************************************
323 *
324 * FUNCTION: AcpiUtReleaseMutex
325 *
326 * PARAMETERS: MutexID - ID of the mutex to be released
327 *
328 * RETURN: Status
329 *
330 * DESCRIPTION: Release a mutex object.
331 *
332 ******************************************************************************/
333
334ACPI_STATUS
335AcpiUtReleaseMutex (
336 ACPI_MUTEX_HANDLE MutexId)
337{
338 ACPI_THREAD_ID ThisThreadId;
339
340
341 ACPI_FUNCTION_NAME (UtReleaseMutex);
342
343
344 ThisThreadId = AcpiOsGetThreadId ();
345 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
346 (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
347
348 if (MutexId > ACPI_MAX_MUTEX)
349 {
350 return (AE_BAD_PARAMETER);
351 }
352
353 /*
354 * Mutex must be acquired in order to release it!
355 */
356 if (AcpiGbl_MutexInfo[MutexId].ThreadId == ACPI_MUTEX_NOT_ACQUIRED)
357 {
358 ACPI_ERROR ((AE_INFO,
359 "Mutex [0x%X] is not acquired, cannot release", MutexId));
360
361 return (AE_NOT_ACQUIRED);
362 }
363
364#ifdef ACPI_MUTEX_DEBUG
365 {
366 UINT32 i;
367 /*
368 * Mutex debug code, for internal debugging only.
369 *
370 * Deadlock prevention. Check if this thread owns any mutexes of value
371 * greater than this one. If so, the thread has violated the mutex
372 * ordering rule. This indicates a coding error somewhere in
373 * the ACPI subsystem code.
374 */
375 for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
376 {
377 if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
378 {
379 if (i == MutexId)
380 {
381 continue;
382 }
383
384 ACPI_ERROR ((AE_INFO,
385 "Invalid release order: owns [%s], releasing [%s]",
386 AcpiUtGetMutexName (i), AcpiUtGetMutexName (MutexId)));
387
388 return (AE_RELEASE_DEADLOCK);
389 }
390 }
391 }
392#endif
393
394 /* Mark unlocked FIRST */
395
396 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
397
398 AcpiOsReleaseMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
399 return (AE_OK);
400}
401
402
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