14 * All rights reserved.
15 *
16 * 2. License
17 *
18 * 2.1. This is your license from Intel Corp. under its intellectual property
19 * rights. You may have additional license terms from the party that provided
20 * you this software, covering your right to use that party's intellectual
21 * property rights.
22 *
23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
24 * copy of the source code appearing in this file ("Covered Code") an
25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
26 * base code distributed originally by Intel ("Original Intel Code") to copy,
27 * make derivatives, distribute, use and display any portion of the Covered
28 * Code in any form, with the right to sublicense such rights; and
29 *
30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
31 * license (with the right to sublicense), under only those claims of Intel
32 * patents that are infringed by the Original Intel Code, to make, use, sell,
33 * offer to sell, and import the Covered Code and derivative works thereof
34 * solely to the minimum extent necessary to exercise the above copyright
35 * license, and in no event shall the patent license extend to any additions
36 * to or modifications of the Original Intel Code. No other license or right
37 * is granted directly or by implication, estoppel or otherwise;
38 *
39 * The above copyright and patent license is granted only if the following
40 * conditions are met:
41 *
42 * 3. Conditions
43 *
44 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
45 * Redistribution of source code of any substantial portion of the Covered
46 * Code or modification with rights to further distribute source must include
47 * the above Copyright Notice, the above License, this list of Conditions,
48 * and the following Disclaimer and Export Compliance provision. In addition,
49 * Licensee must cause all Covered Code to which Licensee contributes to
50 * contain a file documenting the changes Licensee made to create that Covered
51 * Code and the date of any change. Licensee must include in that file the
52 * documentation of any changes made by any predecessor Licensee. Licensee
53 * must include a prominent statement that the modification is derived,
54 * directly or indirectly, from Original Intel Code.
55 *
56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
57 * Redistribution of source code of any substantial portion of the Covered
58 * Code or modification without rights to further distribute source must
59 * include the following Disclaimer and Export Compliance provision in the
60 * documentation and/or other materials provided with distribution. In
61 * addition, Licensee may not authorize further sublicense of source of any
62 * portion of the Covered Code, and must include terms to the effect that the
63 * license from Licensee to its licensee is limited to the intellectual
64 * property embodied in the software Licensee provides to its licensee, and
65 * not to intellectual property embodied in modifications its licensee may
66 * make.
67 *
68 * 3.3. Redistribution of Executable. Redistribution in executable form of any
69 * substantial portion of the Covered Code or modification must reproduce the
70 * above Copyright Notice, and the following Disclaimer and Export Compliance
71 * provision in the documentation and/or other materials provided with the
72 * distribution.
73 *
74 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * Intel Code.
76 *
77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
78 * Intel shall be used in advertising or otherwise to promote the sale, use or
79 * other dealings in products derived from or relating to the Covered Code
80 * without prior written authorization from Intel.
81 *
82 * 4. Disclaimer and Export Compliance
83 *
84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
88 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
89 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * PARTICULAR PURPOSE.
91 *
92 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
93 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
94 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
95 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
96 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
97 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
98 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * LIMITED REMEDY.
100 *
101 * 4.3. Licensee shall not export, either directly or indirectly, any of this
102 * software or system incorporating such software without first obtaining any
103 * required license or other approval from the U. S. Department of Commerce or
104 * any other agency or department of the United States Government. In the
105 * event Licensee exports any such software from the United States or
106 * re-exports any such software from a foreign destination, Licensee shall
107 * ensure that the distribution and export/re-export of the software is in
108 * compliance with all laws, regulations, orders, or other restrictions of the
109 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
110 * any of its subsidiaries will export/re-export any technical data, process,
111 * software, or service, directly or indirectly, to any country for which the
112 * United States government or any agency thereof requires an export license,
113 * other governmental approval, or letter of assurance, without first obtaining
114 * such license, approval or letter.
115 *
116 *****************************************************************************/
117
118#define __EXMUTEX_C__
119
120#include "acpi.h"
121#include "acinterp.h"
122
123#define _COMPONENT ACPI_EXECUTER
124 ACPI_MODULE_NAME ("exmutex")
125
126
127/*******************************************************************************
128 *
129 * FUNCTION: AcpiExUnlinkMutex
130 *
131 * PARAMETERS: *ObjDesc - The mutex to be unlinked
132 *
133 * RETURN: Status
134 *
135 * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
136 *
137 ******************************************************************************/
138
139void
140AcpiExUnlinkMutex (
141 ACPI_OPERAND_OBJECT *ObjDesc)
142{
143 ACPI_THREAD_STATE *Thread = ObjDesc->Mutex.OwnerThread;
144
145
146 if (!Thread)
147 {
148 return;
149 }
150
151 if (ObjDesc->Mutex.Next)
152 {
153 (ObjDesc->Mutex.Next)->Mutex.Prev = ObjDesc->Mutex.Prev;
154 }
155
156 if (ObjDesc->Mutex.Prev)
157 {
158 (ObjDesc->Mutex.Prev)->Mutex.Next = ObjDesc->Mutex.Next;
159 }
160 else
161 {
162 Thread->AcquiredMutexList = ObjDesc->Mutex.Next;
163 }
164}
165
166
167/*******************************************************************************
168 *
169 * FUNCTION: AcpiExLinkMutex
170 *
171 * PARAMETERS: *ObjDesc - The mutex to be linked
172 * *ListHead - head of the "AcquiredMutex" list
173 *
174 * RETURN: Status
175 *
176 * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
177 *
178 ******************************************************************************/
179
180void
181AcpiExLinkMutex (
182 ACPI_OPERAND_OBJECT *ObjDesc,
183 ACPI_THREAD_STATE *Thread)
184{
185 ACPI_OPERAND_OBJECT *ListHead;
186
187
188 ListHead = Thread->AcquiredMutexList;
189
190 /* This object will be the first object in the list */
191
192 ObjDesc->Mutex.Prev = NULL;
193 ObjDesc->Mutex.Next = ListHead;
194
195 /* Update old first object to point back to this object */
196
197 if (ListHead)
198 {
199 ListHead->Mutex.Prev = ObjDesc;
200 }
201
202 /* Update list head */
203
204 Thread->AcquiredMutexList = ObjDesc;
205}
206
207
208/*******************************************************************************
209 *
210 * FUNCTION: AcpiExAcquireMutex
211 *
212 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor
213 * *ObjDesc - The object descriptor for this op
214 *
215 * RETURN: Status
216 *
217 * DESCRIPTION: Acquire an AML mutex
218 *
219 ******************************************************************************/
220
221ACPI_STATUS
222AcpiExAcquireMutex (
223 ACPI_OPERAND_OBJECT *TimeDesc,
224 ACPI_OPERAND_OBJECT *ObjDesc,
225 ACPI_WALK_STATE *WalkState)
226{
227 ACPI_STATUS Status;
228
229
230 ACPI_FUNCTION_TRACE_PTR ("ExAcquireMutex", ObjDesc);
231
232
233 if (!ObjDesc)
234 {
235 return_ACPI_STATUS (AE_BAD_PARAMETER);
236 }
237
238 /* Sanity check -- we must have a valid thread ID */
239
240 if (!WalkState->Thread)
241 {
242 ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], null thread info\n",
243 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
244 return_ACPI_STATUS (AE_AML_INTERNAL);
245 }
246
247 /*
248 * Current Sync must be less than or equal to the sync level of the
249 * mutex. This mechanism provides some deadlock prevention
250 */
251 if (WalkState->Thread->CurrentSyncLevel > ObjDesc->Mutex.SyncLevel)
252 {
253 ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], incorrect SyncLevel\n",
254 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
255 return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
256 }
257
258 /*
259 * Support for multiple acquires by the owning thread
260 */
261
262 if ((ObjDesc->Mutex.OwnerThread) &&
263 (ObjDesc->Mutex.OwnerThread->ThreadId == WalkState->Thread->ThreadId))
264 {
265 /*
266 * The mutex is already owned by this thread,
267 * just increment the acquisition depth
268 */
269 ObjDesc->Mutex.AcquisitionDepth++;
270 return_ACPI_STATUS (AE_OK);
271 }
272
273 /* Acquire the mutex, wait if necessary */
274
275 Status = AcpiExSystemAcquireMutex (TimeDesc, ObjDesc);
276 if (ACPI_FAILURE (Status))
277 {
278 /* Includes failure from a timeout on TimeDesc */
279
280 return_ACPI_STATUS (Status);
281 }
282
283 /* Have the mutex, update mutex and walk info */
284
285 ObjDesc->Mutex.OwnerThread = WalkState->Thread;
286 ObjDesc->Mutex.AcquisitionDepth = 1;
287
288 WalkState->Thread->CurrentSyncLevel = ObjDesc->Mutex.SyncLevel;
289
290 /* Link the mutex to the current thread for force-unlock at method exit */
291
292 AcpiExLinkMutex (ObjDesc, WalkState->Thread);
293
294 return_ACPI_STATUS (AE_OK);
295}
296
297
298/*******************************************************************************
299 *
300 * FUNCTION: AcpiExReleaseMutex
301 *
302 * PARAMETERS: *ObjDesc - The object descriptor for this op
303 *
304 * RETURN: Status
305 *
306 * DESCRIPTION: Release a previously acquired Mutex.
307 *
308 ******************************************************************************/
309
310ACPI_STATUS
311AcpiExReleaseMutex (
312 ACPI_OPERAND_OBJECT *ObjDesc,
313 ACPI_WALK_STATE *WalkState)
314{
315 ACPI_STATUS Status;
316
317
318 ACPI_FUNCTION_TRACE ("ExReleaseMutex");
319
320
321 if (!ObjDesc)
322 {
323 return_ACPI_STATUS (AE_BAD_PARAMETER);
324 }
325
326 /* The mutex must have been previously acquired in order to release it */
327
328 if (!ObjDesc->Mutex.OwnerThread)
329 {
330 ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], not acquired\n",
331 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
332 return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED);
333 }
334
335 /* Sanity check -- we must have a valid thread ID */
336
337 if (!WalkState->Thread)
338 {
339 ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], null thread info\n",
340 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
341 return_ACPI_STATUS (AE_AML_INTERNAL);
342 }
343
344 /* The Mutex is owned, but this thread must be the owner */
345
346 if (ObjDesc->Mutex.OwnerThread->ThreadId != WalkState->Thread->ThreadId)
347 {
348 ACPI_REPORT_ERROR ((
349 "Thread %X cannot release Mutex [%4.4s] acquired by thread %X\n",
350 WalkState->Thread->ThreadId,
351 AcpiUtGetNodeName (ObjDesc->Mutex.Node),
352 ObjDesc->Mutex.OwnerThread->ThreadId));
353 return_ACPI_STATUS (AE_AML_NOT_OWNER);
354 }
355
356 /*
357 * The sync level of the mutex must be less than or
358 * equal to the current sync level
359 */
360 if (ObjDesc->Mutex.SyncLevel > WalkState->Thread->CurrentSyncLevel)
361 {
362 ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], incorrect SyncLevel\n",
363 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
364 return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
365 }
366
367 /*
368 * Match multiple Acquires with multiple Releases
369 */
370 ObjDesc->Mutex.AcquisitionDepth--;
371 if (ObjDesc->Mutex.AcquisitionDepth != 0)
372 {
373 /* Just decrement the depth and return */
374
375 return_ACPI_STATUS (AE_OK);
376 }
377
378 /* Unlink the mutex from the owner's list */
379
380 AcpiExUnlinkMutex (ObjDesc);
381
382 /* Release the mutex */
383
384 Status = AcpiExSystemReleaseMutex (ObjDesc);
385
386 /* Update the mutex and walk state */
387
388 ObjDesc->Mutex.OwnerThread = NULL;
389 WalkState->Thread->CurrentSyncLevel = ObjDesc->Mutex.SyncLevel;
390
391 return_ACPI_STATUS (Status);
392}
393
394
395/*******************************************************************************
396 *
397 * FUNCTION: AcpiExReleaseAllMutexes
398 *
399 * PARAMETERS: *MutexList - Head of the mutex list
400 *
401 * RETURN: Status
402 *
403 * DESCRIPTION: Release all mutexes in the list
404 *
405 ******************************************************************************/
406
407void
408AcpiExReleaseAllMutexes (
409 ACPI_THREAD_STATE *Thread)
410{
411 ACPI_OPERAND_OBJECT *Next = Thread->AcquiredMutexList;
412 ACPI_OPERAND_OBJECT *This;
413 ACPI_STATUS Status;
414
415
416 ACPI_FUNCTION_ENTRY ();
417
418
419 /*
420 * Traverse the list of owned mutexes, releasing each one.
421 */
422 while (Next)
423 {
424 This = Next;
425 Next = This->Mutex.Next;
426
427 This->Mutex.AcquisitionDepth = 1;
428 This->Mutex.Prev = NULL;
429 This->Mutex.Next = NULL;
430
431 /* Release the mutex */
432
433 Status = AcpiExSystemReleaseMutex (This);
434 if (ACPI_FAILURE (Status))
435 {
436 continue;
437 }
438
439 /* Mark mutex unowned */
440
441 This->Mutex.OwnerThread = NULL;
442 }
443}
444
445
| 14 * All rights reserved.
15 *
16 * 2. License
17 *
18 * 2.1. This is your license from Intel Corp. under its intellectual property
19 * rights. You may have additional license terms from the party that provided
20 * you this software, covering your right to use that party's intellectual
21 * property rights.
22 *
23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
24 * copy of the source code appearing in this file ("Covered Code") an
25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
26 * base code distributed originally by Intel ("Original Intel Code") to copy,
27 * make derivatives, distribute, use and display any portion of the Covered
28 * Code in any form, with the right to sublicense such rights; and
29 *
30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
31 * license (with the right to sublicense), under only those claims of Intel
32 * patents that are infringed by the Original Intel Code, to make, use, sell,
33 * offer to sell, and import the Covered Code and derivative works thereof
34 * solely to the minimum extent necessary to exercise the above copyright
35 * license, and in no event shall the patent license extend to any additions
36 * to or modifications of the Original Intel Code. No other license or right
37 * is granted directly or by implication, estoppel or otherwise;
38 *
39 * The above copyright and patent license is granted only if the following
40 * conditions are met:
41 *
42 * 3. Conditions
43 *
44 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
45 * Redistribution of source code of any substantial portion of the Covered
46 * Code or modification with rights to further distribute source must include
47 * the above Copyright Notice, the above License, this list of Conditions,
48 * and the following Disclaimer and Export Compliance provision. In addition,
49 * Licensee must cause all Covered Code to which Licensee contributes to
50 * contain a file documenting the changes Licensee made to create that Covered
51 * Code and the date of any change. Licensee must include in that file the
52 * documentation of any changes made by any predecessor Licensee. Licensee
53 * must include a prominent statement that the modification is derived,
54 * directly or indirectly, from Original Intel Code.
55 *
56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
57 * Redistribution of source code of any substantial portion of the Covered
58 * Code or modification without rights to further distribute source must
59 * include the following Disclaimer and Export Compliance provision in the
60 * documentation and/or other materials provided with distribution. In
61 * addition, Licensee may not authorize further sublicense of source of any
62 * portion of the Covered Code, and must include terms to the effect that the
63 * license from Licensee to its licensee is limited to the intellectual
64 * property embodied in the software Licensee provides to its licensee, and
65 * not to intellectual property embodied in modifications its licensee may
66 * make.
67 *
68 * 3.3. Redistribution of Executable. Redistribution in executable form of any
69 * substantial portion of the Covered Code or modification must reproduce the
70 * above Copyright Notice, and the following Disclaimer and Export Compliance
71 * provision in the documentation and/or other materials provided with the
72 * distribution.
73 *
74 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * Intel Code.
76 *
77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
78 * Intel shall be used in advertising or otherwise to promote the sale, use or
79 * other dealings in products derived from or relating to the Covered Code
80 * without prior written authorization from Intel.
81 *
82 * 4. Disclaimer and Export Compliance
83 *
84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
88 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
89 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * PARTICULAR PURPOSE.
91 *
92 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
93 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
94 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
95 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
96 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
97 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
98 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * LIMITED REMEDY.
100 *
101 * 4.3. Licensee shall not export, either directly or indirectly, any of this
102 * software or system incorporating such software without first obtaining any
103 * required license or other approval from the U. S. Department of Commerce or
104 * any other agency or department of the United States Government. In the
105 * event Licensee exports any such software from the United States or
106 * re-exports any such software from a foreign destination, Licensee shall
107 * ensure that the distribution and export/re-export of the software is in
108 * compliance with all laws, regulations, orders, or other restrictions of the
109 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
110 * any of its subsidiaries will export/re-export any technical data, process,
111 * software, or service, directly or indirectly, to any country for which the
112 * United States government or any agency thereof requires an export license,
113 * other governmental approval, or letter of assurance, without first obtaining
114 * such license, approval or letter.
115 *
116 *****************************************************************************/
117
118#define __EXMUTEX_C__
119
120#include "acpi.h"
121#include "acinterp.h"
122
123#define _COMPONENT ACPI_EXECUTER
124 ACPI_MODULE_NAME ("exmutex")
125
126
127/*******************************************************************************
128 *
129 * FUNCTION: AcpiExUnlinkMutex
130 *
131 * PARAMETERS: *ObjDesc - The mutex to be unlinked
132 *
133 * RETURN: Status
134 *
135 * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
136 *
137 ******************************************************************************/
138
139void
140AcpiExUnlinkMutex (
141 ACPI_OPERAND_OBJECT *ObjDesc)
142{
143 ACPI_THREAD_STATE *Thread = ObjDesc->Mutex.OwnerThread;
144
145
146 if (!Thread)
147 {
148 return;
149 }
150
151 if (ObjDesc->Mutex.Next)
152 {
153 (ObjDesc->Mutex.Next)->Mutex.Prev = ObjDesc->Mutex.Prev;
154 }
155
156 if (ObjDesc->Mutex.Prev)
157 {
158 (ObjDesc->Mutex.Prev)->Mutex.Next = ObjDesc->Mutex.Next;
159 }
160 else
161 {
162 Thread->AcquiredMutexList = ObjDesc->Mutex.Next;
163 }
164}
165
166
167/*******************************************************************************
168 *
169 * FUNCTION: AcpiExLinkMutex
170 *
171 * PARAMETERS: *ObjDesc - The mutex to be linked
172 * *ListHead - head of the "AcquiredMutex" list
173 *
174 * RETURN: Status
175 *
176 * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
177 *
178 ******************************************************************************/
179
180void
181AcpiExLinkMutex (
182 ACPI_OPERAND_OBJECT *ObjDesc,
183 ACPI_THREAD_STATE *Thread)
184{
185 ACPI_OPERAND_OBJECT *ListHead;
186
187
188 ListHead = Thread->AcquiredMutexList;
189
190 /* This object will be the first object in the list */
191
192 ObjDesc->Mutex.Prev = NULL;
193 ObjDesc->Mutex.Next = ListHead;
194
195 /* Update old first object to point back to this object */
196
197 if (ListHead)
198 {
199 ListHead->Mutex.Prev = ObjDesc;
200 }
201
202 /* Update list head */
203
204 Thread->AcquiredMutexList = ObjDesc;
205}
206
207
208/*******************************************************************************
209 *
210 * FUNCTION: AcpiExAcquireMutex
211 *
212 * PARAMETERS: *TimeDesc - The 'time to delay' object descriptor
213 * *ObjDesc - The object descriptor for this op
214 *
215 * RETURN: Status
216 *
217 * DESCRIPTION: Acquire an AML mutex
218 *
219 ******************************************************************************/
220
221ACPI_STATUS
222AcpiExAcquireMutex (
223 ACPI_OPERAND_OBJECT *TimeDesc,
224 ACPI_OPERAND_OBJECT *ObjDesc,
225 ACPI_WALK_STATE *WalkState)
226{
227 ACPI_STATUS Status;
228
229
230 ACPI_FUNCTION_TRACE_PTR ("ExAcquireMutex", ObjDesc);
231
232
233 if (!ObjDesc)
234 {
235 return_ACPI_STATUS (AE_BAD_PARAMETER);
236 }
237
238 /* Sanity check -- we must have a valid thread ID */
239
240 if (!WalkState->Thread)
241 {
242 ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], null thread info\n",
243 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
244 return_ACPI_STATUS (AE_AML_INTERNAL);
245 }
246
247 /*
248 * Current Sync must be less than or equal to the sync level of the
249 * mutex. This mechanism provides some deadlock prevention
250 */
251 if (WalkState->Thread->CurrentSyncLevel > ObjDesc->Mutex.SyncLevel)
252 {
253 ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], incorrect SyncLevel\n",
254 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
255 return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
256 }
257
258 /*
259 * Support for multiple acquires by the owning thread
260 */
261
262 if ((ObjDesc->Mutex.OwnerThread) &&
263 (ObjDesc->Mutex.OwnerThread->ThreadId == WalkState->Thread->ThreadId))
264 {
265 /*
266 * The mutex is already owned by this thread,
267 * just increment the acquisition depth
268 */
269 ObjDesc->Mutex.AcquisitionDepth++;
270 return_ACPI_STATUS (AE_OK);
271 }
272
273 /* Acquire the mutex, wait if necessary */
274
275 Status = AcpiExSystemAcquireMutex (TimeDesc, ObjDesc);
276 if (ACPI_FAILURE (Status))
277 {
278 /* Includes failure from a timeout on TimeDesc */
279
280 return_ACPI_STATUS (Status);
281 }
282
283 /* Have the mutex, update mutex and walk info */
284
285 ObjDesc->Mutex.OwnerThread = WalkState->Thread;
286 ObjDesc->Mutex.AcquisitionDepth = 1;
287
288 WalkState->Thread->CurrentSyncLevel = ObjDesc->Mutex.SyncLevel;
289
290 /* Link the mutex to the current thread for force-unlock at method exit */
291
292 AcpiExLinkMutex (ObjDesc, WalkState->Thread);
293
294 return_ACPI_STATUS (AE_OK);
295}
296
297
298/*******************************************************************************
299 *
300 * FUNCTION: AcpiExReleaseMutex
301 *
302 * PARAMETERS: *ObjDesc - The object descriptor for this op
303 *
304 * RETURN: Status
305 *
306 * DESCRIPTION: Release a previously acquired Mutex.
307 *
308 ******************************************************************************/
309
310ACPI_STATUS
311AcpiExReleaseMutex (
312 ACPI_OPERAND_OBJECT *ObjDesc,
313 ACPI_WALK_STATE *WalkState)
314{
315 ACPI_STATUS Status;
316
317
318 ACPI_FUNCTION_TRACE ("ExReleaseMutex");
319
320
321 if (!ObjDesc)
322 {
323 return_ACPI_STATUS (AE_BAD_PARAMETER);
324 }
325
326 /* The mutex must have been previously acquired in order to release it */
327
328 if (!ObjDesc->Mutex.OwnerThread)
329 {
330 ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], not acquired\n",
331 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
332 return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED);
333 }
334
335 /* Sanity check -- we must have a valid thread ID */
336
337 if (!WalkState->Thread)
338 {
339 ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], null thread info\n",
340 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
341 return_ACPI_STATUS (AE_AML_INTERNAL);
342 }
343
344 /* The Mutex is owned, but this thread must be the owner */
345
346 if (ObjDesc->Mutex.OwnerThread->ThreadId != WalkState->Thread->ThreadId)
347 {
348 ACPI_REPORT_ERROR ((
349 "Thread %X cannot release Mutex [%4.4s] acquired by thread %X\n",
350 WalkState->Thread->ThreadId,
351 AcpiUtGetNodeName (ObjDesc->Mutex.Node),
352 ObjDesc->Mutex.OwnerThread->ThreadId));
353 return_ACPI_STATUS (AE_AML_NOT_OWNER);
354 }
355
356 /*
357 * The sync level of the mutex must be less than or
358 * equal to the current sync level
359 */
360 if (ObjDesc->Mutex.SyncLevel > WalkState->Thread->CurrentSyncLevel)
361 {
362 ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], incorrect SyncLevel\n",
363 AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
364 return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
365 }
366
367 /*
368 * Match multiple Acquires with multiple Releases
369 */
370 ObjDesc->Mutex.AcquisitionDepth--;
371 if (ObjDesc->Mutex.AcquisitionDepth != 0)
372 {
373 /* Just decrement the depth and return */
374
375 return_ACPI_STATUS (AE_OK);
376 }
377
378 /* Unlink the mutex from the owner's list */
379
380 AcpiExUnlinkMutex (ObjDesc);
381
382 /* Release the mutex */
383
384 Status = AcpiExSystemReleaseMutex (ObjDesc);
385
386 /* Update the mutex and walk state */
387
388 ObjDesc->Mutex.OwnerThread = NULL;
389 WalkState->Thread->CurrentSyncLevel = ObjDesc->Mutex.SyncLevel;
390
391 return_ACPI_STATUS (Status);
392}
393
394
395/*******************************************************************************
396 *
397 * FUNCTION: AcpiExReleaseAllMutexes
398 *
399 * PARAMETERS: *MutexList - Head of the mutex list
400 *
401 * RETURN: Status
402 *
403 * DESCRIPTION: Release all mutexes in the list
404 *
405 ******************************************************************************/
406
407void
408AcpiExReleaseAllMutexes (
409 ACPI_THREAD_STATE *Thread)
410{
411 ACPI_OPERAND_OBJECT *Next = Thread->AcquiredMutexList;
412 ACPI_OPERAND_OBJECT *This;
413 ACPI_STATUS Status;
414
415
416 ACPI_FUNCTION_ENTRY ();
417
418
419 /*
420 * Traverse the list of owned mutexes, releasing each one.
421 */
422 while (Next)
423 {
424 This = Next;
425 Next = This->Mutex.Next;
426
427 This->Mutex.AcquisitionDepth = 1;
428 This->Mutex.Prev = NULL;
429 This->Mutex.Next = NULL;
430
431 /* Release the mutex */
432
433 Status = AcpiExSystemReleaseMutex (This);
434 if (ACPI_FAILURE (Status))
435 {
436 continue;
437 }
438
439 /* Mark mutex unowned */
440
441 This->Mutex.OwnerThread = NULL;
442 }
443}
444
445
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