1 /*******************************************************************************
2 *
3 * Module Name: utmutex - local mutex support
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2014, 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
45 #define __UTMUTEX_C__
46
47 #include "acpi.h"
48 #include "accommon.h"
49
50 #define _COMPONENT ACPI_UTILITIES
51 ACPI_MODULE_NAME ("utmutex")
52
53 /* Local prototypes */
54
55 static ACPI_STATUS
56 AcpiUtCreateMutex (
57 ACPI_MUTEX_HANDLE MutexId);
58
59 static void
60 AcpiUtDeleteMutex (
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
77 ACPI_STATUS
78 AcpiUtMutexInitialize (
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 or for speed */
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 Status = AcpiOsCreateLock (&AcpiGbl_ReferenceCountLock);
114 if (ACPI_FAILURE (Status))
115 {
116 return_ACPI_STATUS (Status);
117 }
118
119 /* Mutex for _OSI support */
120
121 Status = AcpiOsCreateMutex (&AcpiGbl_OsiMutex);
122 if (ACPI_FAILURE (Status))
123 {
124 return_ACPI_STATUS (Status);
125 }
126
127 /* Create the reader/writer lock for namespace access */
128
129 Status = AcpiUtCreateRwLock (&AcpiGbl_NamespaceRwLock);
130 return_ACPI_STATUS (Status);
131 }
132
133
134 /*******************************************************************************
135 *
136 * FUNCTION: AcpiUtMutexTerminate
137 *
138 * PARAMETERS: None.
139 *
140 * RETURN: None.
141 *
142 * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
143 * spin locks, and reader/writer locks.
144 *
145 ******************************************************************************/
146
147 void
148 AcpiUtMutexTerminate (
149 void)
150 {
151 UINT32 i;
152
153
154 ACPI_FUNCTION_TRACE (UtMutexTerminate);
155
156
157 /* Delete each predefined mutex object */
158
159 for (i = 0; i < ACPI_NUM_MUTEX; i++)
160 {
161 AcpiUtDeleteMutex (i);
162 }
163
164 AcpiOsDeleteMutex (AcpiGbl_OsiMutex);
165
166 /* Delete the spinlocks */
167
168 AcpiOsDeleteLock (AcpiGbl_GpeLock);
169 AcpiOsDeleteLock (AcpiGbl_HardwareLock);
170 AcpiOsDeleteLock (AcpiGbl_ReferenceCountLock);
171
172 /* Delete the reader/writer lock */
173
174 AcpiUtDeleteRwLock (&AcpiGbl_NamespaceRwLock);
175 return_VOID;
176 }
177
178
179 /*******************************************************************************
180 *
181 * FUNCTION: AcpiUtCreateMutex
182 *
183 * PARAMETERS: MutexID - ID of the mutex to be created
184 *
185 * RETURN: Status
186 *
187 * DESCRIPTION: Create a mutex object.
188 *
189 ******************************************************************************/
190
191 static ACPI_STATUS
192 AcpiUtCreateMutex (
193 ACPI_MUTEX_HANDLE MutexId)
194 {
195 ACPI_STATUS Status = AE_OK;
196
197
198 ACPI_FUNCTION_TRACE_U32 (UtCreateMutex, MutexId);
199
200
201 if (!AcpiGbl_MutexInfo[MutexId].Mutex)
202 {
203 Status = AcpiOsCreateMutex (&AcpiGbl_MutexInfo[MutexId].Mutex);
204 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
205 AcpiGbl_MutexInfo[MutexId].UseCount = 0;
206 }
207
208 return_ACPI_STATUS (Status);
209 }
210
211
212 /*******************************************************************************
213 *
214 * FUNCTION: AcpiUtDeleteMutex
215 *
216 * PARAMETERS: MutexID - ID of the mutex to be deleted
217 *
218 * RETURN: Status
219 *
220 * DESCRIPTION: Delete a mutex object.
221 *
222 ******************************************************************************/
223
224 static void
225 AcpiUtDeleteMutex (
226 ACPI_MUTEX_HANDLE MutexId)
227 {
228
229 ACPI_FUNCTION_TRACE_U32 (UtDeleteMutex, MutexId);
230
231
232 AcpiOsDeleteMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
233
234 AcpiGbl_MutexInfo[MutexId].Mutex = NULL;
235 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
236
237 return_VOID;
238 }
239
240
241 /*******************************************************************************
242 *
243 * FUNCTION: AcpiUtAcquireMutex
244 *
245 * PARAMETERS: MutexID - ID of the mutex to be acquired
246 *
247 * RETURN: Status
248 *
249 * DESCRIPTION: Acquire a mutex object.
250 *
251 ******************************************************************************/
252
253 ACPI_STATUS
254 AcpiUtAcquireMutex (
255 ACPI_MUTEX_HANDLE MutexId)
256 {
257 ACPI_STATUS Status;
258 ACPI_THREAD_ID ThisThreadId;
259
260
261 ACPI_FUNCTION_NAME (UtAcquireMutex);
262
263
264 if (MutexId > ACPI_MAX_MUTEX)
265 {
266 return (AE_BAD_PARAMETER);
267 }
268
269 ThisThreadId = AcpiOsGetThreadId ();
270
271 #ifdef ACPI_MUTEX_DEBUG
272 {
273 UINT32 i;
274 /*
275 * Mutex debug code, for internal debugging only.
276 *
277 * Deadlock prevention. Check if this thread owns any mutexes of value
278 * greater than or equal to this one. If so, the thread has violated
279 * the mutex ordering rule. This indicates a coding error somewhere in
280 * the ACPI subsystem code.
281 */
282 for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
283 {
284 if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId)
285 {
286 if (i == MutexId)
287 {
288 ACPI_ERROR ((AE_INFO,
289 "Mutex [%s] already acquired by this thread [%u]",
290 AcpiUtGetMutexName (MutexId),
291 (UINT32) ThisThreadId));
292
293 return (AE_ALREADY_ACQUIRED);
294 }
295
296 ACPI_ERROR ((AE_INFO,
297 "Invalid acquire order: Thread %u owns [%s], wants [%s]",
298 (UINT32) ThisThreadId, AcpiUtGetMutexName (i),
299 AcpiUtGetMutexName (MutexId)));
300
301 return (AE_ACQUIRE_DEADLOCK);
302 }
303 }
304 }
305 #endif
306
307 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
308 "Thread %u attempting to acquire Mutex [%s]\n",
309 (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
310
311 Status = AcpiOsAcquireMutex (AcpiGbl_MutexInfo[MutexId].Mutex,
312 ACPI_WAIT_FOREVER);
313 if (ACPI_SUCCESS (Status))
314 {
315 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u acquired Mutex [%s]\n",
316 (UINT32) ThisThreadId, AcpiUtGetMutexName (MutexId)));
317
318 AcpiGbl_MutexInfo[MutexId].UseCount++;
319 AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId;
320 }
321 else
322 {
323 ACPI_EXCEPTION ((AE_INFO, Status,
324 "Thread %u could not acquire Mutex [0x%X]",
325 (UINT32) ThisThreadId, MutexId));
326 }
327
328 return (Status);
329 }
330
331
332 /*******************************************************************************
333 *
334 * FUNCTION: AcpiUtReleaseMutex
335 *
336 * PARAMETERS: MutexID - ID of the mutex to be released
337 *
338 * RETURN: Status
339 *
340 * DESCRIPTION: Release a mutex object.
341 *
342 ******************************************************************************/
343
344 ACPI_STATUS
345 AcpiUtReleaseMutex (
346 ACPI_MUTEX_HANDLE MutexId)
347 {
348 ACPI_FUNCTION_NAME (UtReleaseMutex);
349
350
351 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
352 (UINT32) AcpiOsGetThreadId (), AcpiUtGetMutexName (MutexId)));
353
354 if (MutexId > ACPI_MAX_MUTEX)
355 {
356 return (AE_BAD_PARAMETER);
357 }
358
359 /*
360 * Mutex must be acquired in order to release it!
361 */
362 if (AcpiGbl_MutexInfo[MutexId].ThreadId == ACPI_MUTEX_NOT_ACQUIRED)
363 {
364 ACPI_ERROR ((AE_INFO,
365 "Mutex [0x%X] is not acquired, cannot release", MutexId));
366
367 return (AE_NOT_ACQUIRED);
368 }
369
370 #ifdef ACPI_MUTEX_DEBUG
371 {
372 UINT32 i;
373 /*
374 * Mutex debug code, for internal debugging only.
375 *
376 * Deadlock prevention. Check if this thread owns any mutexes of value
377 * greater than this one. If so, the thread has violated the mutex
378 * ordering rule. This indicates a coding error somewhere in
379 * the ACPI subsystem code.
380 */
381 for (i = MutexId; i < ACPI_NUM_MUTEX; i++)
382 {
383 if (AcpiGbl_MutexInfo[i].ThreadId == AcpiOsGetThreadId ())
384 {
385 if (i == MutexId)
386 {
387 continue;
388 }
389
390 ACPI_ERROR ((AE_INFO,
391 "Invalid release order: owns [%s], releasing [%s]",
392 AcpiUtGetMutexName (i), AcpiUtGetMutexName (MutexId)));
393
394 return (AE_RELEASE_DEADLOCK);
395 }
396 }
397 }
398 #endif
399
400 /* Mark unlocked FIRST */
401
402 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED;
403
404 AcpiOsReleaseMutex (AcpiGbl_MutexInfo[MutexId].Mutex);
405 return (AE_OK);
406 }