1 /******************************************************************************* 2 * 3 * Module Name: utmutex - local mutex support 4 * $Revision: 1.3 $ 5 * 6 ******************************************************************************/ 7 8 /****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2005, Intel Corp. 13 * All rights reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial portion of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 * 67 * 3.3. Redistribution of Executable. Redistribution in executable form of any 68 * substantial portion of the Covered Code or modification must reproduce the 69 * above Copyright Notice, and the following Disclaimer and Export Compliance 70 * provision in the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3.4. Intel retains all right, title, and interest in and to the Original 74 * Intel Code. 75 * 76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77 * Intel shall be used in advertising or otherwise to promote the sale, use or 78 * other dealings in products derived from or relating to the Covered Code 79 * without prior written authorization from Intel. 80 * 81 * 4. Disclaimer and Export Compliance 82 * 83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89 * PARTICULAR PURPOSE. 90 * 91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98 * LIMITED REMEDY. 99 * 100 * 4.3. Licensee shall not export, either directly or indirectly, any of this 101 * software or system incorporating such software without first obtaining any 102 * required license or other approval from the U. S. Department of Commerce or 103 * any other agency or department of the United States Government. In the 104 * event Licensee exports any such software from the United States or 105 * re-exports any such software from a foreign destination, Licensee shall 106 * ensure that the distribution and export/re-export of the software is in 107 * compliance with all laws, regulations, orders, or other restrictions of the 108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109 * any of its subsidiaries will export/re-export any technical data, process, 110 * software, or service, directly or indirectly, to any country for which the 111 * United States government or any agency thereof requires an export license, 112 * other governmental approval, or letter of assurance, without first obtaining 113 * such license, approval or letter. 114 * 115 *****************************************************************************/ 116 117 118 #define __UTMUTEX_C__ 119 120 #include "acpi.h" 121 122 #define _COMPONENT ACPI_UTILITIES 123 ACPI_MODULE_NAME ("utmutex") 124 125 /* Local prototypes */ 126 127 static ACPI_STATUS 128 AcpiUtCreateMutex ( 129 ACPI_MUTEX_HANDLE MutexId); 130 131 static ACPI_STATUS 132 AcpiUtDeleteMutex ( 133 ACPI_MUTEX_HANDLE MutexId); 134 135 136 /******************************************************************************* 137 * 138 * FUNCTION: AcpiUtMutexInitialize 139 * 140 * PARAMETERS: None. 141 * 142 * RETURN: Status 143 * 144 * DESCRIPTION: Create the system mutex objects. 145 * 146 ******************************************************************************/ 147 148 ACPI_STATUS 149 AcpiUtMutexInitialize ( 150 void) 151 { 152 UINT32 i; 153 ACPI_STATUS Status; 154 155 156 ACPI_FUNCTION_TRACE ("UtMutexInitialize"); 157 158 159 /* 160 * Create each of the predefined mutex objects 161 */ 162 for (i = 0; i < NUM_MUTEX; i++) 163 { 164 Status = AcpiUtCreateMutex (i); 165 if (ACPI_FAILURE (Status)) 166 { 167 return_ACPI_STATUS (Status); 168 } 169 } 170 171 Status = AcpiOsCreateLock (&AcpiGbl_GpeLock); 172 return_ACPI_STATUS (Status); 173 } 174 175 176 /******************************************************************************* 177 * 178 * FUNCTION: AcpiUtMutexTerminate 179 * 180 * PARAMETERS: None. 181 * 182 * RETURN: None. 183 * 184 * DESCRIPTION: Delete all of the system mutex objects. 185 * 186 ******************************************************************************/ 187 188 void 189 AcpiUtMutexTerminate ( 190 void) 191 { 192 UINT32 i; 193 194 195 ACPI_FUNCTION_TRACE ("UtMutexTerminate"); 196 197 198 /* 199 * Delete each predefined mutex object 200 */ 201 for (i = 0; i < NUM_MUTEX; i++) 202 { 203 (void) AcpiUtDeleteMutex (i); 204 } 205 206 AcpiOsDeleteLock (AcpiGbl_GpeLock); 207 return_VOID; 208 } 209 210 211 /******************************************************************************* 212 * 213 * FUNCTION: AcpiUtCreateMutex 214 * 215 * PARAMETERS: MutexID - ID of the mutex to be created 216 * 217 * RETURN: Status 218 * 219 * DESCRIPTION: Create a mutex object. 220 * 221 ******************************************************************************/ 222 223 static ACPI_STATUS 224 AcpiUtCreateMutex ( 225 ACPI_MUTEX_HANDLE MutexId) 226 { 227 ACPI_STATUS Status = AE_OK; 228 229 230 ACPI_FUNCTION_TRACE_U32 ("UtCreateMutex", MutexId); 231 232 233 if (MutexId > MAX_MUTEX) 234 { 235 return_ACPI_STATUS (AE_BAD_PARAMETER); 236 } 237 238 if (!AcpiGbl_MutexInfo[MutexId].Mutex) 239 { 240 Status = AcpiOsCreateSemaphore (1, 1, 241 &AcpiGbl_MutexInfo[MutexId].Mutex); 242 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED; 243 AcpiGbl_MutexInfo[MutexId].UseCount = 0; 244 } 245 246 return_ACPI_STATUS (Status); 247 } 248 249 250 /******************************************************************************* 251 * 252 * FUNCTION: AcpiUtDeleteMutex 253 * 254 * PARAMETERS: MutexID - ID of the mutex to be deleted 255 * 256 * RETURN: Status 257 * 258 * DESCRIPTION: Delete a mutex object. 259 * 260 ******************************************************************************/ 261 262 static ACPI_STATUS 263 AcpiUtDeleteMutex ( 264 ACPI_MUTEX_HANDLE MutexId) 265 { 266 ACPI_STATUS Status; 267 268 269 ACPI_FUNCTION_TRACE_U32 ("UtDeleteMutex", MutexId); 270 271 272 if (MutexId > MAX_MUTEX) 273 { 274 return_ACPI_STATUS (AE_BAD_PARAMETER); 275 } 276 277 Status = AcpiOsDeleteSemaphore (AcpiGbl_MutexInfo[MutexId].Mutex); 278 279 AcpiGbl_MutexInfo[MutexId].Mutex = NULL; 280 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED; 281 282 return_ACPI_STATUS (Status); 283 } 284 285 286 /******************************************************************************* 287 * 288 * FUNCTION: AcpiUtAcquireMutex 289 * 290 * PARAMETERS: MutexID - ID of the mutex to be acquired 291 * 292 * RETURN: Status 293 * 294 * DESCRIPTION: Acquire a mutex object. 295 * 296 ******************************************************************************/ 297 298 ACPI_STATUS 299 AcpiUtAcquireMutex ( 300 ACPI_MUTEX_HANDLE MutexId) 301 { 302 ACPI_STATUS Status; 303 UINT32 ThisThreadId; 304 305 306 ACPI_FUNCTION_NAME ("UtAcquireMutex"); 307 308 309 if (MutexId > MAX_MUTEX) 310 { 311 return (AE_BAD_PARAMETER); 312 } 313 314 ThisThreadId = AcpiOsGetThreadId (); 315 316 #ifdef ACPI_MUTEX_DEBUG 317 { 318 UINT32 i; 319 /* 320 * Mutex debug code, for internal debugging only. 321 * 322 * Deadlock prevention. Check if this thread owns any mutexes of value 323 * greater than or equal to this one. If so, the thread has violated 324 * the mutex ordering rule. This indicates a coding error somewhere in 325 * the ACPI subsystem code. 326 */ 327 for (i = MutexId; i < MAX_MUTEX; i++) 328 { 329 if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId) 330 { 331 if (i == MutexId) 332 { 333 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 334 "Mutex [%s] already acquired by this thread [%X]\n", 335 AcpiUtGetMutexName (MutexId), ThisThreadId)); 336 337 return (AE_ALREADY_ACQUIRED); 338 } 339 340 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 341 "Invalid acquire order: Thread %X owns [%s], wants [%s]\n", 342 ThisThreadId, AcpiUtGetMutexName (i), 343 AcpiUtGetMutexName (MutexId))); 344 345 return (AE_ACQUIRE_DEADLOCK); 346 } 347 } 348 } 349 #endif 350 351 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, 352 "Thread %X attempting to acquire Mutex [%s]\n", 353 ThisThreadId, AcpiUtGetMutexName (MutexId))); 354 355 Status = AcpiOsWaitSemaphore (AcpiGbl_MutexInfo[MutexId].Mutex, 356 1, ACPI_WAIT_FOREVER); 357 if (ACPI_SUCCESS (Status)) 358 { 359 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %X acquired Mutex [%s]\n", 360 ThisThreadId, AcpiUtGetMutexName (MutexId))); 361 362 AcpiGbl_MutexInfo[MutexId].UseCount++; 363 AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId; 364 } 365 else 366 { 367 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 368 "Thread %X could not acquire Mutex [%s] %s\n", 369 ThisThreadId, AcpiUtGetMutexName (MutexId), 370 AcpiFormatException (Status))); 371 } 372 373 return (Status); 374 } 375 376 377 /******************************************************************************* 378 * 379 * FUNCTION: AcpiUtReleaseMutex 380 * 381 * PARAMETERS: MutexID - ID of the mutex to be released 382 * 383 * RETURN: Status 384 * 385 * DESCRIPTION: Release a mutex object. 386 * 387 ******************************************************************************/ 388 389 ACPI_STATUS 390 AcpiUtReleaseMutex ( 391 ACPI_MUTEX_HANDLE MutexId) 392 { 393 ACPI_STATUS Status; 394 UINT32 ThisThreadId; 395 396 397 ACPI_FUNCTION_NAME ("UtReleaseMutex"); 398 399 400 ThisThreadId = AcpiOsGetThreadId (); 401 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, 402 "Thread %X releasing Mutex [%s]\n", ThisThreadId, 403 AcpiUtGetMutexName (MutexId))); 404 405 if (MutexId > MAX_MUTEX) 406 { 407 return (AE_BAD_PARAMETER); 408 } 409 410 /* 411 * Mutex must be acquired in order to release it! 412 */ 413 if (AcpiGbl_MutexInfo[MutexId].ThreadId == ACPI_MUTEX_NOT_ACQUIRED) 414 { 415 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 416 "Mutex [%s] is not acquired, cannot release\n", 417 AcpiUtGetMutexName (MutexId))); 418 419 return (AE_NOT_ACQUIRED); 420 } 421 422 #ifdef ACPI_MUTEX_DEBUG 423 { 424 UINT32 i; 425 /* 426 * Mutex debug code, for internal debugging only. 427 * 428 * Deadlock prevention. Check if this thread owns any mutexes of value 429 * greater than this one. If so, the thread has violated the mutex 430 * ordering rule. This indicates a coding error somewhere in 431 * the ACPI subsystem code. 432 */ 433 for (i = MutexId; i < MAX_MUTEX; i++) 434 { 435 if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId) 436 { 437 if (i == MutexId) 438 { 439 continue; 440 } 441 442 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 443 "Invalid release order: owns [%s], releasing [%s]\n", 444 AcpiUtGetMutexName (i), AcpiUtGetMutexName (MutexId))); 445 446 return (AE_RELEASE_DEADLOCK); 447 } 448 } 449 } 450 #endif 451 452 /* Mark unlocked FIRST */ 453 454 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED; 455 456 Status = AcpiOsSignalSemaphore (AcpiGbl_MutexInfo[MutexId].Mutex, 1); 457 458 if (ACPI_FAILURE (Status)) 459 { 460 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 461 "Thread %X could not release Mutex [%s] %s\n", 462 ThisThreadId, AcpiUtGetMutexName (MutexId), 463 AcpiFormatException (Status))); 464 } 465 else 466 { 467 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %X released Mutex [%s]\n", 468 ThisThreadId, AcpiUtGetMutexName (MutexId))); 469 } 470 471 return (Status); 472 } 473 474 475