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[pohmelfs.git] / drivers / acpi / acpica / utmutex.c
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1 /*******************************************************************************
3 * Module Name: utmutex - local mutex support
5 ******************************************************************************/
7 /*
8 * Copyright (C) 2000 - 2012, Intel Corp.
9 * All rights reserved.
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.
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.
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.
44 #include <acpi/acpi.h>
45 #include "accommon.h"
47 #define _COMPONENT ACPI_UTILITIES
48 ACPI_MODULE_NAME("utmutex")
50 /* Local prototypes */
51 static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id);
53 static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id);
55 /*******************************************************************************
57 * FUNCTION: acpi_ut_mutex_initialize
59 * PARAMETERS: None.
61 * RETURN: Status
63 * DESCRIPTION: Create the system mutex objects. This includes mutexes,
64 * spin locks, and reader/writer locks.
66 ******************************************************************************/
68 acpi_status acpi_ut_mutex_initialize(void)
70 u32 i;
71 acpi_status status;
73 ACPI_FUNCTION_TRACE(ut_mutex_initialize);
75 /* Create each of the predefined mutex objects */
77 for (i = 0; i < ACPI_NUM_MUTEX; i++) {
78 status = acpi_ut_create_mutex(i);
79 if (ACPI_FAILURE(status)) {
80 return_ACPI_STATUS(status);
84 /* Create the spinlocks for use at interrupt level */
86 status = acpi_os_create_lock (&acpi_gbl_gpe_lock);
87 if (ACPI_FAILURE (status)) {
88 return_ACPI_STATUS (status);
91 status = acpi_os_create_lock (&acpi_gbl_hardware_lock);
92 if (ACPI_FAILURE (status)) {
93 return_ACPI_STATUS (status);
96 /* Mutex for _OSI support */
97 status = acpi_os_create_mutex(&acpi_gbl_osi_mutex);
98 if (ACPI_FAILURE(status)) {
99 return_ACPI_STATUS(status);
102 /* Create the reader/writer lock for namespace access */
104 status = acpi_ut_create_rw_lock(&acpi_gbl_namespace_rw_lock);
105 return_ACPI_STATUS(status);
108 /*******************************************************************************
110 * FUNCTION: acpi_ut_mutex_terminate
112 * PARAMETERS: None.
114 * RETURN: None.
116 * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
117 * spin locks, and reader/writer locks.
119 ******************************************************************************/
121 void acpi_ut_mutex_terminate(void)
123 u32 i;
125 ACPI_FUNCTION_TRACE(ut_mutex_terminate);
127 /* Delete each predefined mutex object */
129 for (i = 0; i < ACPI_NUM_MUTEX; i++) {
130 acpi_ut_delete_mutex(i);
133 acpi_os_delete_mutex(acpi_gbl_osi_mutex);
135 /* Delete the spinlocks */
137 acpi_os_delete_lock(acpi_gbl_gpe_lock);
138 acpi_os_delete_lock(acpi_gbl_hardware_lock);
140 /* Delete the reader/writer lock */
142 acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_lock);
143 return_VOID;
146 /*******************************************************************************
148 * FUNCTION: acpi_ut_create_mutex
150 * PARAMETERS: mutex_iD - ID of the mutex to be created
152 * RETURN: Status
154 * DESCRIPTION: Create a mutex object.
156 ******************************************************************************/
158 static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id)
160 acpi_status status = AE_OK;
162 ACPI_FUNCTION_TRACE_U32(ut_create_mutex, mutex_id);
164 if (!acpi_gbl_mutex_info[mutex_id].mutex) {
165 status =
166 acpi_os_create_mutex(&acpi_gbl_mutex_info[mutex_id].mutex);
167 acpi_gbl_mutex_info[mutex_id].thread_id =
168 ACPI_MUTEX_NOT_ACQUIRED;
169 acpi_gbl_mutex_info[mutex_id].use_count = 0;
172 return_ACPI_STATUS(status);
175 /*******************************************************************************
177 * FUNCTION: acpi_ut_delete_mutex
179 * PARAMETERS: mutex_iD - ID of the mutex to be deleted
181 * RETURN: Status
183 * DESCRIPTION: Delete a mutex object.
185 ******************************************************************************/
187 static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
190 ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
192 acpi_os_delete_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
194 acpi_gbl_mutex_info[mutex_id].mutex = NULL;
195 acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
198 /*******************************************************************************
200 * FUNCTION: acpi_ut_acquire_mutex
202 * PARAMETERS: mutex_iD - ID of the mutex to be acquired
204 * RETURN: Status
206 * DESCRIPTION: Acquire a mutex object.
208 ******************************************************************************/
210 acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
212 acpi_status status;
213 acpi_thread_id this_thread_id;
215 ACPI_FUNCTION_NAME(ut_acquire_mutex);
217 if (mutex_id > ACPI_MAX_MUTEX) {
218 return (AE_BAD_PARAMETER);
221 this_thread_id = acpi_os_get_thread_id();
223 #ifdef ACPI_MUTEX_DEBUG
225 u32 i;
227 * Mutex debug code, for internal debugging only.
229 * Deadlock prevention. Check if this thread owns any mutexes of value
230 * greater than or equal to this one. If so, the thread has violated
231 * the mutex ordering rule. This indicates a coding error somewhere in
232 * the ACPI subsystem code.
234 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
235 if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
236 if (i == mutex_id) {
237 ACPI_ERROR((AE_INFO,
238 "Mutex [%s] already acquired by this thread [%u]",
239 acpi_ut_get_mutex_name
240 (mutex_id),
241 (u32)this_thread_id));
243 return (AE_ALREADY_ACQUIRED);
246 ACPI_ERROR((AE_INFO,
247 "Invalid acquire order: Thread %u owns [%s], wants [%s]",
248 (u32)this_thread_id,
249 acpi_ut_get_mutex_name(i),
250 acpi_ut_get_mutex_name(mutex_id)));
252 return (AE_ACQUIRE_DEADLOCK);
256 #endif
258 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
259 "Thread %u attempting to acquire Mutex [%s]\n",
260 (u32)this_thread_id,
261 acpi_ut_get_mutex_name(mutex_id)));
263 status = acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex,
264 ACPI_WAIT_FOREVER);
265 if (ACPI_SUCCESS(status)) {
266 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
267 "Thread %u acquired Mutex [%s]\n",
268 (u32)this_thread_id,
269 acpi_ut_get_mutex_name(mutex_id)));
271 acpi_gbl_mutex_info[mutex_id].use_count++;
272 acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id;
273 } else {
274 ACPI_EXCEPTION((AE_INFO, status,
275 "Thread %u could not acquire Mutex [0x%X]",
276 (u32)this_thread_id, mutex_id));
279 return (status);
282 /*******************************************************************************
284 * FUNCTION: acpi_ut_release_mutex
286 * PARAMETERS: mutex_iD - ID of the mutex to be released
288 * RETURN: Status
290 * DESCRIPTION: Release a mutex object.
292 ******************************************************************************/
294 acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
296 ACPI_FUNCTION_NAME(ut_release_mutex);
298 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
299 (u32)acpi_os_get_thread_id(),
300 acpi_ut_get_mutex_name(mutex_id)));
302 if (mutex_id > ACPI_MAX_MUTEX) {
303 return (AE_BAD_PARAMETER);
307 * Mutex must be acquired in order to release it!
309 if (acpi_gbl_mutex_info[mutex_id].thread_id == ACPI_MUTEX_NOT_ACQUIRED) {
310 ACPI_ERROR((AE_INFO,
311 "Mutex [0x%X] is not acquired, cannot release",
312 mutex_id));
314 return (AE_NOT_ACQUIRED);
316 #ifdef ACPI_MUTEX_DEBUG
318 u32 i;
320 * Mutex debug code, for internal debugging only.
322 * Deadlock prevention. Check if this thread owns any mutexes of value
323 * greater than this one. If so, the thread has violated the mutex
324 * ordering rule. This indicates a coding error somewhere in
325 * the ACPI subsystem code.
327 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
328 if (acpi_gbl_mutex_info[i].thread_id ==
329 acpi_os_get_thread_id()) {
330 if (i == mutex_id) {
331 continue;
334 ACPI_ERROR((AE_INFO,
335 "Invalid release order: owns [%s], releasing [%s]",
336 acpi_ut_get_mutex_name(i),
337 acpi_ut_get_mutex_name(mutex_id)));
339 return (AE_RELEASE_DEADLOCK);
343 #endif
345 /* Mark unlocked FIRST */
347 acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
349 acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
350 return (AE_OK);