1 /*******************************************************************************
3 * Module Name: utmutex - local mutex support
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2010, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
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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.
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
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41 * POSSIBILITY OF SUCH DAMAGES.
44 #include <acpi/acpi.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
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)
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 spin_lock_init(acpi_gbl_gpe_lock
);
87 spin_lock_init(acpi_gbl_hardware_lock
);
89 /* Mutex for _OSI support */
90 status
= acpi_os_create_mutex(&acpi_gbl_osi_mutex
);
91 if (ACPI_FAILURE(status
)) {
92 return_ACPI_STATUS(status
);
95 /* Create the reader/writer lock for namespace access */
97 status
= acpi_ut_create_rw_lock(&acpi_gbl_namespace_rw_lock
);
98 return_ACPI_STATUS(status
);
101 /*******************************************************************************
103 * FUNCTION: acpi_ut_mutex_terminate
109 * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
110 * spin locks, and reader/writer locks.
112 ******************************************************************************/
114 void acpi_ut_mutex_terminate(void)
118 ACPI_FUNCTION_TRACE(ut_mutex_terminate
);
120 /* Delete each predefined mutex object */
122 for (i
= 0; i
< ACPI_NUM_MUTEX
; i
++) {
123 acpi_ut_delete_mutex(i
);
126 acpi_os_delete_mutex(acpi_gbl_osi_mutex
);
128 /* Delete the spinlocks */
130 acpi_os_delete_lock(acpi_gbl_gpe_lock
);
131 acpi_os_delete_lock(acpi_gbl_hardware_lock
);
133 /* Delete the reader/writer lock */
135 acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_lock
);
139 /*******************************************************************************
141 * FUNCTION: acpi_ut_create_mutex
143 * PARAMETERS: mutex_iD - ID of the mutex to be created
147 * DESCRIPTION: Create a mutex object.
149 ******************************************************************************/
151 static acpi_status
acpi_ut_create_mutex(acpi_mutex_handle mutex_id
)
153 acpi_status status
= AE_OK
;
155 ACPI_FUNCTION_TRACE_U32(ut_create_mutex
, mutex_id
);
157 if (!acpi_gbl_mutex_info
[mutex_id
].mutex
) {
159 acpi_os_create_mutex(&acpi_gbl_mutex_info
[mutex_id
].mutex
);
160 acpi_gbl_mutex_info
[mutex_id
].thread_id
=
161 ACPI_MUTEX_NOT_ACQUIRED
;
162 acpi_gbl_mutex_info
[mutex_id
].use_count
= 0;
165 return_ACPI_STATUS(status
);
168 /*******************************************************************************
170 * FUNCTION: acpi_ut_delete_mutex
172 * PARAMETERS: mutex_iD - ID of the mutex to be deleted
176 * DESCRIPTION: Delete a mutex object.
178 ******************************************************************************/
180 static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id
)
183 ACPI_FUNCTION_TRACE_U32(ut_delete_mutex
, mutex_id
);
185 acpi_os_delete_mutex(acpi_gbl_mutex_info
[mutex_id
].mutex
);
187 acpi_gbl_mutex_info
[mutex_id
].mutex
= NULL
;
188 acpi_gbl_mutex_info
[mutex_id
].thread_id
= ACPI_MUTEX_NOT_ACQUIRED
;
191 /*******************************************************************************
193 * FUNCTION: acpi_ut_acquire_mutex
195 * PARAMETERS: mutex_iD - ID of the mutex to be acquired
199 * DESCRIPTION: Acquire a mutex object.
201 ******************************************************************************/
203 acpi_status
acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id
)
206 acpi_thread_id this_thread_id
;
208 ACPI_FUNCTION_NAME(ut_acquire_mutex
);
210 if (mutex_id
> ACPI_MAX_MUTEX
) {
211 return (AE_BAD_PARAMETER
);
214 this_thread_id
= acpi_os_get_thread_id();
216 #ifdef ACPI_MUTEX_DEBUG
220 * Mutex debug code, for internal debugging only.
222 * Deadlock prevention. Check if this thread owns any mutexes of value
223 * greater than or equal to this one. If so, the thread has violated
224 * the mutex ordering rule. This indicates a coding error somewhere in
225 * the ACPI subsystem code.
227 for (i
= mutex_id
; i
< ACPI_NUM_MUTEX
; i
++) {
228 if (acpi_gbl_mutex_info
[i
].thread_id
== this_thread_id
) {
231 "Mutex [%s] already acquired by this thread [%p]",
232 acpi_ut_get_mutex_name
237 return (AE_ALREADY_ACQUIRED
);
241 "Invalid acquire order: Thread %p owns [%s], wants [%s]",
242 ACPI_CAST_PTR(void, this_thread_id
),
243 acpi_ut_get_mutex_name(i
),
244 acpi_ut_get_mutex_name(mutex_id
)));
246 return (AE_ACQUIRE_DEADLOCK
);
252 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
253 "Thread %p attempting to acquire Mutex [%s]\n",
254 ACPI_CAST_PTR(void, this_thread_id
),
255 acpi_ut_get_mutex_name(mutex_id
)));
257 status
= acpi_os_acquire_mutex(acpi_gbl_mutex_info
[mutex_id
].mutex
,
259 if (ACPI_SUCCESS(status
)) {
260 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
,
261 "Thread %p acquired Mutex [%s]\n",
262 ACPI_CAST_PTR(void, this_thread_id
),
263 acpi_ut_get_mutex_name(mutex_id
)));
265 acpi_gbl_mutex_info
[mutex_id
].use_count
++;
266 acpi_gbl_mutex_info
[mutex_id
].thread_id
= this_thread_id
;
268 ACPI_EXCEPTION((AE_INFO
, status
,
269 "Thread %p could not acquire Mutex [0x%X]",
270 ACPI_CAST_PTR(void, this_thread_id
), mutex_id
));
276 /*******************************************************************************
278 * FUNCTION: acpi_ut_release_mutex
280 * PARAMETERS: mutex_iD - ID of the mutex to be released
284 * DESCRIPTION: Release a mutex object.
286 ******************************************************************************/
288 acpi_status
acpi_ut_release_mutex(acpi_mutex_handle mutex_id
)
290 ACPI_FUNCTION_NAME(ut_release_mutex
);
292 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX
, "Thread %p releasing Mutex [%s]\n",
293 ACPI_CAST_PTR(void, acpi_os_get_thread_id()),
294 acpi_ut_get_mutex_name(mutex_id
)));
296 if (mutex_id
> ACPI_MAX_MUTEX
) {
297 return (AE_BAD_PARAMETER
);
301 * Mutex must be acquired in order to release it!
303 if (acpi_gbl_mutex_info
[mutex_id
].thread_id
== ACPI_MUTEX_NOT_ACQUIRED
) {
305 "Mutex [0x%X] is not acquired, cannot release",
308 return (AE_NOT_ACQUIRED
);
310 #ifdef ACPI_MUTEX_DEBUG
314 * Mutex debug code, for internal debugging only.
316 * Deadlock prevention. Check if this thread owns any mutexes of value
317 * greater than this one. If so, the thread has violated the mutex
318 * ordering rule. This indicates a coding error somewhere in
319 * the ACPI subsystem code.
321 for (i
= mutex_id
; i
< ACPI_NUM_MUTEX
; i
++) {
322 if (acpi_gbl_mutex_info
[i
].thread_id
== this_thread_id
) {
328 "Invalid release order: owns [%s], releasing [%s]",
329 acpi_ut_get_mutex_name(i
),
330 acpi_ut_get_mutex_name(mutex_id
)));
332 return (AE_RELEASE_DEADLOCK
);
338 /* Mark unlocked FIRST */
340 acpi_gbl_mutex_info
[mutex_id
].thread_id
= ACPI_MUTEX_NOT_ACQUIRED
;
342 acpi_os_release_mutex(acpi_gbl_mutex_info
[mutex_id
].mutex
);