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 - 2018, Intel Corp.
12  * All rights reserved.
13  *
14  * 2. License
15  *
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.
20  *
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  *****************************************************************************
115  *
116  * Alternatively, you may choose to be licensed under the terms of the
117  * following license:
118  *
119  * Redistribution and use in source and binary forms, with or without
120  * modification, are permitted provided that the following conditions
121  * are met:
122  * 1. Redistributions of source code must retain the above copyright
123  *    notice, this list of conditions, and the following disclaimer,
124  *    without modification.
125  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126  *    substantially similar to the "NO WARRANTY" disclaimer below
127  *    ("Disclaimer") and any redistribution must be conditioned upon
128  *    including a substantially similar Disclaimer requirement for further
129  *    binary redistribution.
130  * 3. Neither the names of the above-listed copyright holders nor the names
131  *    of any contributors may be used to endorse or promote products derived
132  *    from this software without specific prior written permission.
133  *
134  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145  *
146  * Alternatively, you may choose to be licensed under the terms of the
147  * GNU General Public License ("GPL") version 2 as published by the Free
148  * Software Foundation.
149  *
150  *****************************************************************************/
151 
152 #include "acpi.h"
153 #include "accommon.h"
154 
155 #define _COMPONENT          ACPI_UTILITIES
156         ACPI_MODULE_NAME    ("utmutex")
157 
158 /* Local prototypes */
159 
160 static ACPI_STATUS
161 AcpiUtCreateMutex (
162     ACPI_MUTEX_HANDLE       MutexId);
163 
164 static void
165 AcpiUtDeleteMutex (
166     ACPI_MUTEX_HANDLE       MutexId);
167 
168 
169 /*******************************************************************************
170  *
171  * FUNCTION:    AcpiUtMutexInitialize
172  *
173  * PARAMETERS:  None.
174  *
175  * RETURN:      Status
176  *
177  * DESCRIPTION: Create the system mutex objects. This includes mutexes,
178  *              spin locks, and reader/writer locks.
179  *
180  ******************************************************************************/
181 
182 ACPI_STATUS
AcpiUtMutexInitialize(void)183 AcpiUtMutexInitialize (
184     void)
185 {
186     UINT32                  i;
187     ACPI_STATUS             Status;
188 
189 
190     ACPI_FUNCTION_TRACE (UtMutexInitialize);
191 
192 
193     /* Create each of the predefined mutex objects */
194 
195     for (i = 0; i < ACPI_NUM_MUTEX; i++)
196     {
197         Status = AcpiUtCreateMutex (i);
198         if (ACPI_FAILURE (Status))
199         {
200             return_ACPI_STATUS (Status);
201         }
202     }
203 
204     /* Create the spinlocks for use at interrupt level or for speed */
205 
206     Status = AcpiOsCreateLock (&AcpiGbl_GpeLock);
207     if (ACPI_FAILURE (Status))
208     {
209         return_ACPI_STATUS (Status);
210     }
211 
212     Status = AcpiOsCreateLock (&AcpiGbl_HardwareLock);
213     if (ACPI_FAILURE (Status))
214     {
215         return_ACPI_STATUS (Status);
216     }
217 
218     Status = AcpiOsCreateLock (&AcpiGbl_ReferenceCountLock);
219     if (ACPI_FAILURE (Status))
220     {
221         return_ACPI_STATUS (Status);
222     }
223 
224     /* Mutex for _OSI support */
225 
226     Status = AcpiOsCreateMutex (&AcpiGbl_OsiMutex);
227     if (ACPI_FAILURE (Status))
228     {
229         return_ACPI_STATUS (Status);
230     }
231 
232     /* Create the reader/writer lock for namespace access */
233 
234     Status = AcpiUtCreateRwLock (&AcpiGbl_NamespaceRwLock);
235     if (ACPI_FAILURE (Status))
236     {
237         return_ACPI_STATUS (Status);
238     }
239 
240     return_ACPI_STATUS (Status);
241 }
242 
243 
244 /*******************************************************************************
245  *
246  * FUNCTION:    AcpiUtMutexTerminate
247  *
248  * PARAMETERS:  None.
249  *
250  * RETURN:      None.
251  *
252  * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
253  *              spin locks, and reader/writer locks.
254  *
255  ******************************************************************************/
256 
257 void
AcpiUtMutexTerminate(void)258 AcpiUtMutexTerminate (
259     void)
260 {
261     UINT32                  i;
262 
263 
264     ACPI_FUNCTION_TRACE (UtMutexTerminate);
265 
266 
267     /* Delete each predefined mutex object */
268 
269     for (i = 0; i < ACPI_NUM_MUTEX; i++)
270     {
271         AcpiUtDeleteMutex (i);
272     }
273 
274     AcpiOsDeleteMutex (AcpiGbl_OsiMutex);
275 
276     /* Delete the spinlocks */
277 
278     AcpiOsDeleteLock (AcpiGbl_GpeLock);
279     AcpiOsDeleteLock (AcpiGbl_HardwareLock);
280     AcpiOsDeleteLock (AcpiGbl_ReferenceCountLock);
281 
282     /* Delete the reader/writer lock */
283 
284     AcpiUtDeleteRwLock (&AcpiGbl_NamespaceRwLock);
285     return_VOID;
286 }
287 
288 
289 /*******************************************************************************
290  *
291  * FUNCTION:    AcpiUtCreateMutex
292  *
293  * PARAMETERS:  MutexID         - ID of the mutex to be created
294  *
295  * RETURN:      Status
296  *
297  * DESCRIPTION: Create a mutex object.
298  *
299  ******************************************************************************/
300 
301 static ACPI_STATUS
AcpiUtCreateMutex(ACPI_MUTEX_HANDLE MutexId)302 AcpiUtCreateMutex (
303     ACPI_MUTEX_HANDLE       MutexId)
304 {
305     ACPI_STATUS             Status = AE_OK;
306 
307 
308     ACPI_FUNCTION_TRACE_U32 (UtCreateMutex, MutexId);
309 
310 
311     if (!AcpiGbl_MutexInfo[MutexId].Mutex)
312     {
313         Status = AcpiOsCreateMutex (&AcpiGbl_MutexInfo[MutexId].Mutex);
314         AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
315         AcpiGbl_MutexInfo[MutexId].UseCount = 0;
316     }
317 
318     return_ACPI_STATUS (Status);
319 }
320 
321 
322 /*******************************************************************************
323  *
324  * FUNCTION:    AcpiUtDeleteMutex
325  *
326  * PARAMETERS:  MutexID         - ID of the mutex to be deleted
327  *
328  * RETURN:      Status
329  *
330  * DESCRIPTION: Delete a mutex object.
331  *
332  ******************************************************************************/
333 
334 static void
AcpiUtDeleteMutex(ACPI_MUTEX_HANDLE MutexId)335 AcpiUtDeleteMutex (
336     ACPI_MUTEX_HANDLE       MutexId)
337 {
338 
339     ACPI_FUNCTION_TRACE_U32 (UtDeleteMutex, MutexId);
340 
341 
342     AcpiOsDeleteMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
343 
344     AcpiGbl_MutexInfo[MutexId].Mutex = NULL;
345     AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
346 
347     return_VOID;
348 }
349 
350 
351 /*******************************************************************************
352  *
353  * FUNCTION:    AcpiUtAcquireMutex
354  *
355  * PARAMETERS:  MutexID         - ID of the mutex to be acquired
356  *
357  * RETURN:      Status
358  *
359  * DESCRIPTION: Acquire a mutex object.
360  *
361  ******************************************************************************/
362 
363 ACPI_STATUS
AcpiUtAcquireMutex(ACPI_MUTEX_HANDLE MutexId)364 AcpiUtAcquireMutex (
365     ACPI_MUTEX_HANDLE       MutexId)
366 {
367     ACPI_STATUS             Status;
368     ACPI_THREAD_ID          ThisThreadId;
369 
370 
371     ACPI_FUNCTION_NAME (UtAcquireMutex);
372 
373 
374     if (MutexId > ACPI_MAX_MUTEX)
375     {
376         return (AE_BAD_PARAMETER);
377     }
378 
379     ThisThreadId = AcpiOsGetThreadId ();
380 
381 #ifdef ACPI_MUTEX_DEBUG
382     {
383         UINT32                  i;
384         /*
385          * Mutex debug code, for internal debugging only.
386          *
387          * Deadlock prevention. Check if this thread owns any mutexes of value
388          * greater than or equal to this one. If so, the thread has violated
389          * the mutex ordering rule. This indicates a coding error somewhere in
390          * the ACPI subsystem code.
391          */
392         for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
393         {
394             if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
395             {
396                 if (i == MutexId)
397                 {
398                     ACPI_ERROR ((AE_INFO,
399                         "Mutex [%s] already acquired by this thread [%u]",
400                         AcpiUtGetMutexName (MutexId),
401                         (UINT32) ThisThreadId));
402 
403                     return (AE_ALREADY_ACQUIRED);
404                 }
405 
406                 ACPI_ERROR ((AE_INFO,
407                     "Invalid acquire order: Thread %u owns [%s], wants [%s]",
408                     (UINT32) ThisThreadId, AcpiUtGetMutexName (i),
409                     AcpiUtGetMutexName (MutexId)));
410 
411                 return (AE_ACQUIRE_DEADLOCK);
412             }
413         }
414     }
415 #endif
416 
417     ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
418         "Thread %u attempting to acquire Mutex [%s]\n",
419         (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
420 
421     Status = AcpiOsAcquireMutex (
422         AcpiGbl_MutexInfo[MutexId].Mutex, ACPI_WAIT_FOREVER);
423     if (ACPI_SUCCESS (Status))
424     {
425         ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
426             "Thread %u acquired Mutex [%s]\n",
427             (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
428 
429         AcpiGbl_MutexInfo[MutexId].UseCount++;
430         AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId;
431     }
432     else
433     {
434         ACPI_EXCEPTION ((AE_INFO, Status,
435             "Thread %u could not acquire Mutex [%s] (0x%X)",
436             (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId), MutexId));
437     }
438 
439     return (Status);
440 }
441 
442 
443 /*******************************************************************************
444  *
445  * FUNCTION:    AcpiUtReleaseMutex
446  *
447  * PARAMETERS:  MutexID         - ID of the mutex to be released
448  *
449  * RETURN:      Status
450  *
451  * DESCRIPTION: Release a mutex object.
452  *
453  ******************************************************************************/
454 
455 ACPI_STATUS
AcpiUtReleaseMutex(ACPI_MUTEX_HANDLE MutexId)456 AcpiUtReleaseMutex (
457     ACPI_MUTEX_HANDLE       MutexId)
458 {
459     ACPI_FUNCTION_NAME (UtReleaseMutex);
460 
461 
462     ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
463         (UINT32) AcpiOsGetThreadId (), AcpiUtGetMutexName (MutexId)));
464 
465     if (MutexId > ACPI_MAX_MUTEX)
466     {
467         return (AE_BAD_PARAMETER);
468     }
469 
470     /*
471      * Mutex must be acquired in order to release it!
472      */
473     if (AcpiGbl_MutexInfo[MutexId].ThreadId == ACPI_MUTEX_NOT_ACQUIRED)
474     {
475         ACPI_ERROR ((AE_INFO,
476             "Mutex [%s] (0x%X) is not acquired, cannot release",
477             AcpiUtGetMutexName (MutexId), MutexId));
478 
479         return (AE_NOT_ACQUIRED);
480     }
481 
482 #ifdef ACPI_MUTEX_DEBUG
483     {
484         UINT32                  i;
485         /*
486          * Mutex debug code, for internal debugging only.
487          *
488          * Deadlock prevention. Check if this thread owns any mutexes of value
489          * greater than this one. If so, the thread has violated the mutex
490          * ordering rule. This indicates a coding error somewhere in
491          * the ACPI subsystem code.
492          */
493         for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
494         {
495             if (AcpiGbl_MutexInfo[i].ThreadId == AcpiOsGetThreadId ())
496             {
497                 if (i == MutexId)
498                 {
499                     continue;
500                 }
501 
502                 ACPI_ERROR ((AE_INFO,
503                     "Invalid release order: owns [%s], releasing [%s]",
504                     AcpiUtGetMutexName (i), AcpiUtGetMutexName (MutexId)));
505 
506                 return (AE_RELEASE_DEADLOCK);
507             }
508         }
509     }
510 #endif
511 
512     /* Mark unlocked FIRST */
513 
514     AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
515 
516     AcpiOsReleaseMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
517     return (AE_OK);
518 }
519