1 /*******************************************************************************
3 * Module Name: utmutex - local mutex support
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2011, Intel Corp.
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20 * including a substantially similar Disclaimer requirement for further
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
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47 #include <contrib/dev/acpica/include/acpi.h>
48 #include <contrib/dev/acpica/include/accommon.h>
50 #define _COMPONENT ACPI_UTILITIES
51 ACPI_MODULE_NAME ("utmutex")
53 /* Local prototypes */
57 ACPI_MUTEX_HANDLE MutexId);
61 ACPI_MUTEX_HANDLE MutexId);
64 /*******************************************************************************
66 * FUNCTION: AcpiUtMutexInitialize
72 * DESCRIPTION: Create the system mutex objects. This includes mutexes,
73 * spin locks, and reader/writer locks.
75 ******************************************************************************/
78 AcpiUtMutexInitialize (
85 ACPI_FUNCTION_TRACE (UtMutexInitialize);
88 /* Create each of the predefined mutex objects */
90 for (i = 0; i < ACPI_NUM_MUTEX; i++)
92 Status = AcpiUtCreateMutex (i);
93 if (ACPI_FAILURE (Status))
95 return_ACPI_STATUS (Status);
99 /* Create the spinlocks for use at interrupt level */
101 Status = AcpiOsCreateLock (&AcpiGbl_GpeLock);
102 if (ACPI_FAILURE (Status))
104 return_ACPI_STATUS (Status);
107 Status = AcpiOsCreateLock (&AcpiGbl_HardwareLock);
108 if (ACPI_FAILURE (Status))
110 return_ACPI_STATUS (Status);
113 /* Mutex for _OSI support */
114 Status = AcpiOsCreateMutex (&AcpiGbl_OsiMutex);
115 if (ACPI_FAILURE (Status))
117 return_ACPI_STATUS (Status);
120 /* Create the reader/writer lock for namespace access */
122 Status = AcpiUtCreateRwLock (&AcpiGbl_NamespaceRwLock);
123 return_ACPI_STATUS (Status);
127 /*******************************************************************************
129 * FUNCTION: AcpiUtMutexTerminate
135 * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
136 * spin locks, and reader/writer locks.
138 ******************************************************************************/
141 AcpiUtMutexTerminate (
147 ACPI_FUNCTION_TRACE (UtMutexTerminate);
150 /* Delete each predefined mutex object */
152 for (i = 0; i < ACPI_NUM_MUTEX; i++)
154 AcpiUtDeleteMutex (i);
157 AcpiOsDeleteMutex (AcpiGbl_OsiMutex);
159 /* Delete the spinlocks */
161 AcpiOsDeleteLock (AcpiGbl_GpeLock);
162 AcpiOsDeleteLock (AcpiGbl_HardwareLock);
164 /* Delete the reader/writer lock */
166 AcpiUtDeleteRwLock (&AcpiGbl_NamespaceRwLock);
171 /*******************************************************************************
173 * FUNCTION: AcpiUtCreateMutex
175 * PARAMETERS: MutexID - ID of the mutex to be created
179 * DESCRIPTION: Create a mutex object.
181 ******************************************************************************/
185 ACPI_MUTEX_HANDLE MutexId)
187 ACPI_STATUS Status = AE_OK;
190 ACPI_FUNCTION_TRACE_U32 (UtCreateMutex, MutexId);
193 if (!AcpiGbl_MutexInfo[MutexId].Mutex)
195 Status = AcpiOsCreateMutex (&AcpiGbl_MutexInfo[MutexId].Mutex);
196 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
197 AcpiGbl_MutexInfo[MutexId].UseCount = 0;
200 return_ACPI_STATUS (Status);
204 /*******************************************************************************
206 * FUNCTION: AcpiUtDeleteMutex
208 * PARAMETERS: MutexID - ID of the mutex to be deleted
212 * DESCRIPTION: Delete a mutex object.
214 ******************************************************************************/
218 ACPI_MUTEX_HANDLE MutexId)
221 ACPI_FUNCTION_TRACE_U32 (UtDeleteMutex, MutexId);
224 AcpiOsDeleteMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
226 AcpiGbl_MutexInfo[MutexId].Mutex = NULL;
227 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
231 /*******************************************************************************
233 * FUNCTION: AcpiUtAcquireMutex
235 * PARAMETERS: MutexID - ID of the mutex to be acquired
239 * DESCRIPTION: Acquire a mutex object.
241 ******************************************************************************/
245 ACPI_MUTEX_HANDLE MutexId)
248 ACPI_THREAD_ID ThisThreadId;
251 ACPI_FUNCTION_NAME (UtAcquireMutex);
254 if (MutexId > ACPI_MAX_MUTEX)
256 return (AE_BAD_PARAMETER);
259 ThisThreadId = AcpiOsGetThreadId ();
261 #ifdef ACPI_MUTEX_DEBUG
265 * Mutex debug code, for internal debugging only.
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.
272 for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
274 if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
278 ACPI_ERROR ((AE_INFO,
279 "Mutex [%s] already acquired by this thread [%u]",
280 AcpiUtGetMutexName (MutexId),
281 (UINT32) ThisThreadId));
283 return (AE_ALREADY_ACQUIRED);
286 ACPI_ERROR ((AE_INFO,
287 "Invalid acquire order: Thread %u owns [%s], wants [%s]",
288 (UINT32) ThisThreadId, AcpiUtGetMutexName (i),
289 AcpiUtGetMutexName (MutexId)));
291 return (AE_ACQUIRE_DEADLOCK);
297 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
298 "Thread %u attempting to acquire Mutex [%s]\n",
299 (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
301 Status = AcpiOsAcquireMutex (AcpiGbl_MutexInfo[MutexId].Mutex,
303 if (ACPI_SUCCESS (Status))
305 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u acquired Mutex [%s]\n",
306 (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
308 AcpiGbl_MutexInfo[MutexId].UseCount++;
309 AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId;
313 ACPI_EXCEPTION ((AE_INFO, Status,
314 "Thread %u could not acquire Mutex [0x%X]",
315 (UINT32) ThisThreadId, MutexId));
322 /*******************************************************************************
324 * FUNCTION: AcpiUtReleaseMutex
326 * PARAMETERS: MutexID - ID of the mutex to be released
330 * DESCRIPTION: Release a mutex object.
332 ******************************************************************************/
336 ACPI_MUTEX_HANDLE MutexId)
338 ACPI_THREAD_ID ThisThreadId;
341 ACPI_FUNCTION_NAME (UtReleaseMutex);
344 ThisThreadId = AcpiOsGetThreadId ();
345 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
346 (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
348 if (MutexId > ACPI_MAX_MUTEX)
350 return (AE_BAD_PARAMETER);
354 * Mutex must be acquired in order to release it!
356 if (AcpiGbl_MutexInfo[MutexId].ThreadId == ACPI_MUTEX_NOT_ACQUIRED)
358 ACPI_ERROR ((AE_INFO,
359 "Mutex [0x%X] is not acquired, cannot release", MutexId));
361 return (AE_NOT_ACQUIRED);
364 #ifdef ACPI_MUTEX_DEBUG
368 * Mutex debug code, for internal debugging only.
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.
375 for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
377 if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
384 ACPI_ERROR ((AE_INFO,
385 "Invalid release order: owns [%s], releasing [%s]",
386 AcpiUtGetMutexName (i), AcpiUtGetMutexName (MutexId)));
388 return (AE_RELEASE_DEADLOCK);
394 /* Mark unlocked FIRST */
396 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
398 AcpiOsReleaseMutex (AcpiGbl_MutexInfo[MutexId].Mutex);