Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: exmutex - ASL Mutex Acquire/Release functions |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
Bob Moore | fbb7a2d | 2014-02-08 09:42:25 +0800 | [diff] [blame] | 8 | * Copyright (C) 2000 - 2014, Intel Corp. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <acpi/acpi.h> |
Len Brown | e2f7a77 | 2009-01-09 00:30:03 -0500 | [diff] [blame] | 45 | #include "accommon.h" |
| 46 | #include "acinterp.h" |
| 47 | #include "acevents.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | #define _COMPONENT ACPI_EXECUTER |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 50 | ACPI_MODULE_NAME("exmutex") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 52 | /* Local prototypes */ |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 53 | static void |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 54 | acpi_ex_link_mutex(union acpi_operand_object *obj_desc, |
| 55 | struct acpi_thread_state *thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | /******************************************************************************* |
| 58 | * |
| 59 | * FUNCTION: acpi_ex_unlink_mutex |
| 60 | * |
| 61 | * PARAMETERS: obj_desc - The mutex to be unlinked |
| 62 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 63 | * RETURN: None |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | * |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 65 | * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | * |
| 67 | ******************************************************************************/ |
| 68 | |
Len Brown | 262a7a2 | 2007-05-09 23:01:59 -0400 | [diff] [blame] | 69 | void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | { |
Len Brown | 262a7a2 | 2007-05-09 23:01:59 -0400 | [diff] [blame] | 71 | struct acpi_thread_state *thread = obj_desc->mutex.owner_thread; |
| 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | if (!thread) { |
| 74 | return; |
| 75 | } |
| 76 | |
| 77 | /* Doubly linked list */ |
| 78 | |
| 79 | if (obj_desc->mutex.next) { |
| 80 | (obj_desc->mutex.next)->mutex.prev = obj_desc->mutex.prev; |
| 81 | } |
| 82 | |
| 83 | if (obj_desc->mutex.prev) { |
| 84 | (obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next; |
Bob Moore | 10a3b46 | 2009-05-21 10:02:34 +0800 | [diff] [blame] | 85 | |
| 86 | /* |
Bob Moore | a7499bc | 2010-04-01 11:04:54 +0800 | [diff] [blame] | 87 | * Migrate the previous sync level associated with this mutex to |
| 88 | * the previous mutex on the list so that it may be preserved. |
| 89 | * This handles the case where several mutexes have been acquired |
| 90 | * at the same level, but are not released in opposite order. |
Bob Moore | 10a3b46 | 2009-05-21 10:02:34 +0800 | [diff] [blame] | 91 | */ |
| 92 | (obj_desc->mutex.prev)->mutex.original_sync_level = |
| 93 | obj_desc->mutex.original_sync_level; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 94 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | thread->acquired_mutex_list = obj_desc->mutex.next; |
| 96 | } |
| 97 | } |
| 98 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | /******************************************************************************* |
| 100 | * |
| 101 | * FUNCTION: acpi_ex_link_mutex |
| 102 | * |
Bob Moore | a7499bc | 2010-04-01 11:04:54 +0800 | [diff] [blame] | 103 | * PARAMETERS: obj_desc - The mutex to be linked |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 104 | * thread - Current executing thread object |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 106 | * RETURN: None |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | * |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 108 | * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | * |
| 110 | ******************************************************************************/ |
| 111 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 112 | static void |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 113 | acpi_ex_link_mutex(union acpi_operand_object *obj_desc, |
| 114 | struct acpi_thread_state *thread) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 116 | union acpi_operand_object *list_head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
| 118 | list_head = thread->acquired_mutex_list; |
| 119 | |
| 120 | /* This object will be the first object in the list */ |
| 121 | |
| 122 | obj_desc->mutex.prev = NULL; |
| 123 | obj_desc->mutex.next = list_head; |
| 124 | |
| 125 | /* Update old first object to point back to this object */ |
| 126 | |
| 127 | if (list_head) { |
| 128 | list_head->mutex.prev = obj_desc; |
| 129 | } |
| 130 | |
| 131 | /* Update list head */ |
| 132 | |
| 133 | thread->acquired_mutex_list = obj_desc; |
| 134 | } |
| 135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | /******************************************************************************* |
| 137 | * |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 138 | * FUNCTION: acpi_ex_acquire_mutex_object |
| 139 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 140 | * PARAMETERS: timeout - Timeout in milliseconds |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 141 | * obj_desc - Mutex object |
Bob Moore | a7499bc | 2010-04-01 11:04:54 +0800 | [diff] [blame] | 142 | * thread_id - Current thread state |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 143 | * |
| 144 | * RETURN: Status |
| 145 | * |
Bob Moore | 91e38d1 | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 146 | * DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common |
| 147 | * path that supports multiple acquires by the same thread. |
| 148 | * |
| 149 | * MUTEX: Interpreter must be locked |
| 150 | * |
| 151 | * NOTE: This interface is called from three places: |
| 152 | * 1) From acpi_ex_acquire_mutex, via an AML Acquire() operator |
| 153 | * 2) From acpi_ex_acquire_global_lock when an AML Field access requires the |
| 154 | * global lock |
| 155 | * 3) From the external interface, acpi_acquire_global_lock |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 156 | * |
| 157 | ******************************************************************************/ |
| 158 | |
| 159 | acpi_status |
| 160 | acpi_ex_acquire_mutex_object(u16 timeout, |
| 161 | union acpi_operand_object *obj_desc, |
| 162 | acpi_thread_id thread_id) |
| 163 | { |
| 164 | acpi_status status; |
| 165 | |
| 166 | ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex_object, obj_desc); |
| 167 | |
Bob Moore | f02e9fa | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 168 | if (!obj_desc) { |
| 169 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
| 170 | } |
| 171 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 172 | /* Support for multiple acquires by the owning thread */ |
| 173 | |
| 174 | if (obj_desc->mutex.thread_id == thread_id) { |
| 175 | /* |
| 176 | * The mutex is already owned by this thread, just increment the |
| 177 | * acquisition depth |
| 178 | */ |
| 179 | obj_desc->mutex.acquisition_depth++; |
| 180 | return_ACPI_STATUS(AE_OK); |
| 181 | } |
| 182 | |
| 183 | /* Acquire the mutex, wait if necessary. Special case for Global Lock */ |
| 184 | |
| 185 | if (obj_desc == acpi_gbl_global_lock_mutex) { |
| 186 | status = acpi_ev_acquire_global_lock(timeout); |
| 187 | } else { |
| 188 | status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex, |
| 189 | timeout); |
| 190 | } |
| 191 | |
| 192 | if (ACPI_FAILURE(status)) { |
| 193 | |
| 194 | /* Includes failure from a timeout on time_desc */ |
| 195 | |
| 196 | return_ACPI_STATUS(status); |
| 197 | } |
| 198 | |
Bob Moore | 91e38d1 | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 199 | /* Acquired the mutex: update mutex object */ |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 200 | |
| 201 | obj_desc->mutex.thread_id = thread_id; |
| 202 | obj_desc->mutex.acquisition_depth = 1; |
| 203 | obj_desc->mutex.original_sync_level = 0; |
| 204 | obj_desc->mutex.owner_thread = NULL; /* Used only for AML Acquire() */ |
| 205 | |
| 206 | return_ACPI_STATUS(AE_OK); |
| 207 | } |
| 208 | |
| 209 | /******************************************************************************* |
| 210 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | * FUNCTION: acpi_ex_acquire_mutex |
| 212 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 213 | * PARAMETERS: time_desc - Timeout integer |
| 214 | * obj_desc - Mutex object |
| 215 | * walk_state - Current method execution state |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | * |
| 217 | * RETURN: Status |
| 218 | * |
| 219 | * DESCRIPTION: Acquire an AML mutex |
| 220 | * |
| 221 | ******************************************************************************/ |
| 222 | |
| 223 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 224 | acpi_ex_acquire_mutex(union acpi_operand_object *time_desc, |
| 225 | union acpi_operand_object *obj_desc, |
| 226 | struct acpi_walk_state *walk_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 228 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 230 | ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex, obj_desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
| 232 | if (!obj_desc) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 233 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | } |
| 235 | |
Bob Moore | a7499bc | 2010-04-01 11:04:54 +0800 | [diff] [blame] | 236 | /* Must have a valid thread state struct */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | if (!walk_state->thread) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 239 | ACPI_ERROR((AE_INFO, |
| 240 | "Cannot acquire Mutex [%4.4s], null thread info", |
| 241 | acpi_ut_get_node_name(obj_desc->mutex.node))); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 242 | return_ACPI_STATUS(AE_AML_INTERNAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | /* |
Bob Moore | 91e38d1 | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 246 | * Current sync level must be less than or equal to the sync level of the |
Bob Moore | 967440e3 | 2006-06-23 17:04:00 -0400 | [diff] [blame] | 247 | * mutex. This mechanism provides some deadlock prevention |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | */ |
| 249 | if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 250 | ACPI_ERROR((AE_INFO, |
Bob Moore | f6a22b0 | 2010-03-05 17:56:40 +0800 | [diff] [blame] | 251 | "Cannot acquire Mutex [%4.4s], current SyncLevel is too large (%u)", |
Bob Moore | 967440e3 | 2006-06-23 17:04:00 -0400 | [diff] [blame] | 252 | acpi_ut_get_node_name(obj_desc->mutex.node), |
| 253 | walk_state->thread->current_sync_level)); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 254 | return_ACPI_STATUS(AE_AML_MUTEX_ORDER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | } |
| 256 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 257 | status = acpi_ex_acquire_mutex_object((u16) time_desc->integer.value, |
| 258 | obj_desc, |
| 259 | walk_state->thread->thread_id); |
| 260 | if (ACPI_SUCCESS(status) && obj_desc->mutex.acquisition_depth == 1) { |
Bob Moore | 91e38d1 | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 261 | |
| 262 | /* Save Thread object, original/current sync levels */ |
| 263 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 264 | obj_desc->mutex.owner_thread = walk_state->thread; |
| 265 | obj_desc->mutex.original_sync_level = |
| 266 | walk_state->thread->current_sync_level; |
| 267 | walk_state->thread->current_sync_level = |
| 268 | obj_desc->mutex.sync_level; |
| 269 | |
| 270 | /* Link the mutex to the current thread for force-unlock at method exit */ |
| 271 | |
| 272 | acpi_ex_link_mutex(obj_desc, walk_state->thread); |
| 273 | } |
| 274 | |
| 275 | return_ACPI_STATUS(status); |
| 276 | } |
| 277 | |
| 278 | /******************************************************************************* |
| 279 | * |
| 280 | * FUNCTION: acpi_ex_release_mutex_object |
| 281 | * |
| 282 | * PARAMETERS: obj_desc - The object descriptor for this op |
| 283 | * |
| 284 | * RETURN: Status |
| 285 | * |
| 286 | * DESCRIPTION: Release a previously acquired Mutex, low level interface. |
Bob Moore | 91e38d1 | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 287 | * Provides a common path that supports multiple releases (after |
| 288 | * previous multiple acquires) by the same thread. |
| 289 | * |
| 290 | * MUTEX: Interpreter must be locked |
| 291 | * |
| 292 | * NOTE: This interface is called from three places: |
| 293 | * 1) From acpi_ex_release_mutex, via an AML Acquire() operator |
| 294 | * 2) From acpi_ex_release_global_lock when an AML Field access requires the |
| 295 | * global lock |
| 296 | * 3) From the external interface, acpi_release_global_lock |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 297 | * |
| 298 | ******************************************************************************/ |
| 299 | |
| 300 | acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc) |
| 301 | { |
| 302 | acpi_status status = AE_OK; |
| 303 | |
| 304 | ACPI_FUNCTION_TRACE(ex_release_mutex_object); |
| 305 | |
Bob Moore | f02e9fa | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 306 | if (obj_desc->mutex.acquisition_depth == 0) { |
Bob Moore | 68aafc3 | 2012-10-31 02:26:01 +0000 | [diff] [blame] | 307 | return_ACPI_STATUS(AE_NOT_ACQUIRED); |
Bob Moore | f02e9fa | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 308 | } |
| 309 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 310 | /* Match multiple Acquires with multiple Releases */ |
| 311 | |
| 312 | obj_desc->mutex.acquisition_depth--; |
| 313 | if (obj_desc->mutex.acquisition_depth != 0) { |
| 314 | |
| 315 | /* Just decrement the depth and return */ |
| 316 | |
| 317 | return_ACPI_STATUS(AE_OK); |
| 318 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Len Brown | 262a7a2 | 2007-05-09 23:01:59 -0400 | [diff] [blame] | 320 | if (obj_desc->mutex.owner_thread) { |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 321 | |
| 322 | /* Unlink the mutex from the owner's list */ |
| 323 | |
| 324 | acpi_ex_unlink_mutex(obj_desc); |
| 325 | obj_desc->mutex.owner_thread = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | } |
| 327 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 328 | /* Release the mutex, special case for Global Lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 330 | if (obj_desc == acpi_gbl_global_lock_mutex) { |
| 331 | status = acpi_ev_release_global_lock(); |
Bob Moore | c81da66 | 2007-02-02 19:48:18 +0300 | [diff] [blame] | 332 | } else { |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 333 | acpi_os_release_mutex(obj_desc->mutex.os_mutex); |
Bob Moore | c81da66 | 2007-02-02 19:48:18 +0300 | [diff] [blame] | 334 | } |
| 335 | |
Bob Moore | 91e38d1 | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 336 | /* Clear mutex info */ |
| 337 | |
Lin Ming | 28eb3fc | 2010-09-15 13:55:13 +0800 | [diff] [blame] | 338 | obj_desc->mutex.thread_id = 0; |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 339 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | /******************************************************************************* |
| 343 | * |
| 344 | * FUNCTION: acpi_ex_release_mutex |
| 345 | * |
| 346 | * PARAMETERS: obj_desc - The object descriptor for this op |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 347 | * walk_state - Current method execution state |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | * |
| 349 | * RETURN: Status |
| 350 | * |
| 351 | * DESCRIPTION: Release a previously acquired Mutex. |
| 352 | * |
| 353 | ******************************************************************************/ |
| 354 | |
| 355 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 356 | acpi_ex_release_mutex(union acpi_operand_object *obj_desc, |
| 357 | struct acpi_walk_state *walk_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | { |
Bob Moore | c81da66 | 2007-02-02 19:48:18 +0300 | [diff] [blame] | 359 | acpi_status status = AE_OK; |
Bob Moore | 10a3b46 | 2009-05-21 10:02:34 +0800 | [diff] [blame] | 360 | u8 previous_sync_level; |
Lin Ming | e0f4028 | 2010-03-05 17:59:54 +0800 | [diff] [blame] | 361 | struct acpi_thread_state *owner_thread; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 363 | ACPI_FUNCTION_TRACE(ex_release_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | |
| 365 | if (!obj_desc) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 366 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | } |
| 368 | |
Lin Ming | e0f4028 | 2010-03-05 17:59:54 +0800 | [diff] [blame] | 369 | owner_thread = obj_desc->mutex.owner_thread; |
| 370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | /* The mutex must have been previously acquired in order to release it */ |
| 372 | |
Lin Ming | e0f4028 | 2010-03-05 17:59:54 +0800 | [diff] [blame] | 373 | if (!owner_thread) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 374 | ACPI_ERROR((AE_INFO, |
| 375 | "Cannot release Mutex [%4.4s], not acquired", |
| 376 | acpi_ut_get_node_name(obj_desc->mutex.node))); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 377 | return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Lv Zheng | 75c8044 | 2012-12-19 05:36:49 +0000 | [diff] [blame] | 380 | /* Must have a valid thread ID */ |
Lv Zheng | 3e8214e | 2012-12-19 05:37:15 +0000 | [diff] [blame] | 381 | |
Dan Carpenter | fbc3be2 | 2009-12-11 15:31:40 +0800 | [diff] [blame] | 382 | if (!walk_state->thread) { |
| 383 | ACPI_ERROR((AE_INFO, |
| 384 | "Cannot release Mutex [%4.4s], null thread info", |
| 385 | acpi_ut_get_node_name(obj_desc->mutex.node))); |
| 386 | return_ACPI_STATUS(AE_AML_INTERNAL); |
| 387 | } |
| 388 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | /* |
| 390 | * The Mutex is owned, but this thread must be the owner. |
| 391 | * Special case for Global Lock, any thread can release |
| 392 | */ |
Lin Ming | e0f4028 | 2010-03-05 17:59:54 +0800 | [diff] [blame] | 393 | if ((owner_thread->thread_id != walk_state->thread->thread_id) && |
| 394 | (obj_desc != acpi_gbl_global_lock_mutex)) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 395 | ACPI_ERROR((AE_INFO, |
Lin Ming | 28eb3fc | 2010-09-15 13:55:13 +0800 | [diff] [blame] | 396 | "Thread %u cannot release Mutex [%4.4s] acquired by thread %u", |
| 397 | (u32)walk_state->thread->thread_id, |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 398 | acpi_ut_get_node_name(obj_desc->mutex.node), |
Lin Ming | 28eb3fc | 2010-09-15 13:55:13 +0800 | [diff] [blame] | 399 | (u32)owner_thread->thread_id)); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 400 | return_ACPI_STATUS(AE_AML_NOT_OWNER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | /* |
Bob Moore | 315c728 | 2009-05-21 10:04:33 +0800 | [diff] [blame] | 404 | * The sync level of the mutex must be equal to the current sync level. In |
| 405 | * other words, the current level means that at least one mutex at that |
| 406 | * level is currently being held. Attempting to release a mutex of a |
| 407 | * different level can only mean that the mutex ordering rule is being |
| 408 | * violated. This behavior is clarified in ACPI 4.0 specification. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | */ |
Lin Ming | e0f4028 | 2010-03-05 17:59:54 +0800 | [diff] [blame] | 410 | if (obj_desc->mutex.sync_level != owner_thread->current_sync_level) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 411 | ACPI_ERROR((AE_INFO, |
Bob Moore | f6a22b0 | 2010-03-05 17:56:40 +0800 | [diff] [blame] | 412 | "Cannot release Mutex [%4.4s], SyncLevel mismatch: mutex %u current %u", |
Bob Moore | f02e9fa | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 413 | acpi_ut_get_node_name(obj_desc->mutex.node), |
| 414 | obj_desc->mutex.sync_level, |
| 415 | walk_state->thread->current_sync_level)); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 416 | return_ACPI_STATUS(AE_AML_MUTEX_ORDER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
Bob Moore | 10a3b46 | 2009-05-21 10:02:34 +0800 | [diff] [blame] | 419 | /* |
| 420 | * Get the previous sync_level from the head of the acquired mutex list. |
| 421 | * This handles the case where several mutexes at the same level have been |
| 422 | * acquired, but are not released in reverse order. |
| 423 | */ |
| 424 | previous_sync_level = |
Lin Ming | e0f4028 | 2010-03-05 17:59:54 +0800 | [diff] [blame] | 425 | owner_thread->acquired_mutex_list->mutex.original_sync_level; |
Bob Moore | 10a3b46 | 2009-05-21 10:02:34 +0800 | [diff] [blame] | 426 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 427 | status = acpi_ex_release_mutex_object(obj_desc); |
Bob Moore | 315c728 | 2009-05-21 10:04:33 +0800 | [diff] [blame] | 428 | if (ACPI_FAILURE(status)) { |
| 429 | return_ACPI_STATUS(status); |
| 430 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
Bob Moore | f02e9fa | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 432 | if (obj_desc->mutex.acquisition_depth == 0) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 433 | |
Bob Moore | 315c728 | 2009-05-21 10:04:33 +0800 | [diff] [blame] | 434 | /* Restore the previous sync_level */ |
Bob Moore | f02e9fa | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 435 | |
Lin Ming | e0f4028 | 2010-03-05 17:59:54 +0800 | [diff] [blame] | 436 | owner_thread->current_sync_level = previous_sync_level; |
Bob Moore | f02e9fa | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 437 | } |
Bob Moore | a7499bc | 2010-04-01 11:04:54 +0800 | [diff] [blame] | 438 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 439 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | } |
| 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | /******************************************************************************* |
| 443 | * |
| 444 | * FUNCTION: acpi_ex_release_all_mutexes |
| 445 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 446 | * PARAMETERS: thread - Current executing thread object |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | * |
| 448 | * RETURN: Status |
| 449 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 450 | * DESCRIPTION: Release all mutexes held by this thread |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | * |
Bob Moore | f70a5e7 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 452 | * NOTE: This function is called as the thread is exiting the interpreter. |
| 453 | * Mutexes are not released when an individual control method is exited, but |
| 454 | * only when the parent thread actually exits the interpreter. This allows one |
| 455 | * method to acquire a mutex, and a different method to release it, as long as |
| 456 | * this is performed underneath a single parent control method. |
| 457 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | ******************************************************************************/ |
| 459 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 460 | void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 462 | union acpi_operand_object *next = thread->acquired_mutex_list; |
Bob Moore | c81da66 | 2007-02-02 19:48:18 +0300 | [diff] [blame] | 463 | union acpi_operand_object *obj_desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
Bob Moore | 2489ef0 | 2012-10-31 02:27:24 +0000 | [diff] [blame] | 465 | ACPI_FUNCTION_NAME(ex_release_all_mutexes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | /* Traverse the list of owned mutexes, releasing each one */ |
| 468 | |
| 469 | while (next) { |
Bob Moore | c81da66 | 2007-02-02 19:48:18 +0300 | [diff] [blame] | 470 | obj_desc = next; |
| 471 | next = obj_desc->mutex.next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
Bob Moore | c81da66 | 2007-02-02 19:48:18 +0300 | [diff] [blame] | 473 | obj_desc->mutex.prev = NULL; |
| 474 | obj_desc->mutex.next = NULL; |
Bob Moore | f70a5e7 | 2007-02-02 19:48:21 +0300 | [diff] [blame] | 475 | obj_desc->mutex.acquisition_depth = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
Bob Moore | 2489ef0 | 2012-10-31 02:27:24 +0000 | [diff] [blame] | 477 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
| 478 | "Force-releasing held mutex: %p\n", |
| 479 | obj_desc)); |
| 480 | |
Bob Moore | c81da66 | 2007-02-02 19:48:18 +0300 | [diff] [blame] | 481 | /* Release the mutex, special case for Global Lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 483 | if (obj_desc == acpi_gbl_global_lock_mutex) { |
Bob Moore | c81da66 | 2007-02-02 19:48:18 +0300 | [diff] [blame] | 484 | |
| 485 | /* Ignore errors */ |
| 486 | |
| 487 | (void)acpi_ev_release_global_lock(); |
| 488 | } else { |
| 489 | acpi_os_release_mutex(obj_desc->mutex.os_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | /* Mark mutex unowned */ |
| 493 | |
Len Brown | 262a7a2 | 2007-05-09 23:01:59 -0400 | [diff] [blame] | 494 | obj_desc->mutex.owner_thread = NULL; |
Lin Ming | 28eb3fc | 2010-09-15 13:55:13 +0800 | [diff] [blame] | 495 | obj_desc->mutex.thread_id = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
| 497 | /* Update Thread sync_level (Last mutex is the important one) */ |
| 498 | |
Bob Moore | c81da66 | 2007-02-02 19:48:18 +0300 | [diff] [blame] | 499 | thread->current_sync_level = |
| 500 | obj_desc->mutex.original_sync_level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | } |
| 502 | } |