1 /******************************************************************************* 2 * 3 * Module Name: utmutex - local mutex support 4 * $Revision: 1.13 $ 5 * 6 ******************************************************************************/ 7 8 /****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2008, 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 < ACPI_NUM_MUTEX; i++) 163 { 164 Status = AcpiUtCreateMutex (i); 165 if (ACPI_FAILURE (Status)) 166 { 167 return_ACPI_STATUS (Status); 168 } 169 } 170 171 /* Create the spinlocks for use at interrupt level */ 172 173 Status = AcpiOsCreateLock (&AcpiGbl_GpeLock); 174 if (ACPI_FAILURE (Status)) 175 { 176 return_ACPI_STATUS (Status); 177 } 178 179 Status = AcpiOsCreateLock (&AcpiGbl_HardwareLock); 180 return_ACPI_STATUS (Status); 181 } 182 183 184 /******************************************************************************* 185 * 186 * FUNCTION: AcpiUtMutexTerminate 187 * 188 * PARAMETERS: None. 189 * 190 * RETURN: None. 191 * 192 * DESCRIPTION: Delete all of the system mutex objects. 193 * 194 ******************************************************************************/ 195 196 void 197 AcpiUtMutexTerminate ( 198 void) 199 { 200 UINT32 i; 201 202 203 ACPI_FUNCTION_TRACE (UtMutexTerminate); 204 205 206 /* 207 * Delete each predefined mutex object 208 */ 209 for (i = 0; i < ACPI_NUM_MUTEX; i++) 210 { 211 (void) AcpiUtDeleteMutex (i); 212 } 213 214 /* Delete the spinlocks */ 215 216 AcpiOsDeleteLock (AcpiGbl_GpeLock); 217 AcpiOsDeleteLock (AcpiGbl_HardwareLock); 218 return_VOID; 219 } 220 221 222 /******************************************************************************* 223 * 224 * FUNCTION: AcpiUtCreateMutex 225 * 226 * PARAMETERS: MutexID - ID of the mutex to be created 227 * 228 * RETURN: Status 229 * 230 * DESCRIPTION: Create a mutex object. 231 * 232 ******************************************************************************/ 233 234 static ACPI_STATUS 235 AcpiUtCreateMutex ( 236 ACPI_MUTEX_HANDLE MutexId) 237 { 238 ACPI_STATUS Status = AE_OK; 239 240 241 ACPI_FUNCTION_TRACE_U32 (UtCreateMutex, MutexId); 242 243 244 if (MutexId > ACPI_MAX_MUTEX) 245 { 246 return_ACPI_STATUS (AE_BAD_PARAMETER); 247 } 248 249 if (!AcpiGbl_MutexInfo[MutexId].Mutex) 250 { 251 Status = AcpiOsCreateMutex (&AcpiGbl_MutexInfo[MutexId].Mutex); 252 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED; 253 AcpiGbl_MutexInfo[MutexId].UseCount = 0; 254 } 255 256 return_ACPI_STATUS (Status); 257 } 258 259 260 /******************************************************************************* 261 * 262 * FUNCTION: AcpiUtDeleteMutex 263 * 264 * PARAMETERS: MutexID - ID of the mutex to be deleted 265 * 266 * RETURN: Status 267 * 268 * DESCRIPTION: Delete a mutex object. 269 * 270 ******************************************************************************/ 271 272 static ACPI_STATUS 273 AcpiUtDeleteMutex ( 274 ACPI_MUTEX_HANDLE MutexId) 275 { 276 277 ACPI_FUNCTION_TRACE_U32 (UtDeleteMutex, MutexId); 278 279 280 if (MutexId > ACPI_MAX_MUTEX) 281 { 282 return_ACPI_STATUS (AE_BAD_PARAMETER); 283 } 284 285 AcpiOsDeleteMutex (AcpiGbl_MutexInfo[MutexId].Mutex); 286 287 AcpiGbl_MutexInfo[MutexId].Mutex = NULL; 288 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED; 289 290 return_ACPI_STATUS (AE_OK); 291 } 292 293 294 /******************************************************************************* 295 * 296 * FUNCTION: AcpiUtAcquireMutex 297 * 298 * PARAMETERS: MutexID - ID of the mutex to be acquired 299 * 300 * RETURN: Status 301 * 302 * DESCRIPTION: Acquire a mutex object. 303 * 304 ******************************************************************************/ 305 306 ACPI_STATUS 307 AcpiUtAcquireMutex ( 308 ACPI_MUTEX_HANDLE MutexId) 309 { 310 ACPI_STATUS Status; 311 ACPI_THREAD_ID ThisThreadId; 312 313 314 ACPI_FUNCTION_NAME (UtAcquireMutex); 315 316 317 if (MutexId > ACPI_MAX_MUTEX) 318 { 319 return (AE_BAD_PARAMETER); 320 } 321 322 ThisThreadId = AcpiOsGetThreadId (); 323 324 #ifdef ACPI_MUTEX_DEBUG 325 { 326 UINT32 i; 327 /* 328 * Mutex debug code, for internal debugging only. 329 * 330 * Deadlock prevention. Check if this thread owns any mutexes of value 331 * greater than or equal to this one. If so, the thread has violated 332 * the mutex ordering rule. This indicates a coding error somewhere in 333 * the ACPI subsystem code. 334 */ 335 for (i = MutexId; i < ACPI_NUM_MUTEX; i++) 336 { 337 if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId) 338 { 339 if (i == MutexId) 340 { 341 ACPI_ERROR ((AE_INFO, 342 "Mutex [%s] already acquired by this thread [%X]", 343 AcpiUtGetMutexName (MutexId), ThisThreadId)); 344 345 return (AE_ALREADY_ACQUIRED); 346 } 347 348 ACPI_ERROR ((AE_INFO, 349 "Invalid acquire order: Thread %X owns [%s], wants [%s]", 350 ThisThreadId, AcpiUtGetMutexName (i), 351 AcpiUtGetMutexName (MutexId))); 352 353 return (AE_ACQUIRE_DEADLOCK); 354 } 355 } 356 } 357 #endif 358 359 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, 360 "Thread %X attempting to acquire Mutex [%s]\n", 361 ThisThreadId, AcpiUtGetMutexName (MutexId))); 362 363 Status = AcpiOsAcquireMutex (AcpiGbl_MutexInfo[MutexId].Mutex, 364 ACPI_WAIT_FOREVER); 365 if (ACPI_SUCCESS (Status)) 366 { 367 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %X acquired Mutex [%s]\n", 368 ThisThreadId, AcpiUtGetMutexName (MutexId))); 369 370 AcpiGbl_MutexInfo[MutexId].UseCount++; 371 AcpiGbl_MutexInfo[MutexId].ThreadId = ThisThreadId; 372 } 373 else 374 { 375 ACPI_EXCEPTION ((AE_INFO, Status, 376 "Thread %X could not acquire Mutex [%X]", ThisThreadId, MutexId)); 377 } 378 379 return (Status); 380 } 381 382 383 /******************************************************************************* 384 * 385 * FUNCTION: AcpiUtReleaseMutex 386 * 387 * PARAMETERS: MutexID - ID of the mutex to be released 388 * 389 * RETURN: Status 390 * 391 * DESCRIPTION: Release a mutex object. 392 * 393 ******************************************************************************/ 394 395 ACPI_STATUS 396 AcpiUtReleaseMutex ( 397 ACPI_MUTEX_HANDLE MutexId) 398 { 399 ACPI_THREAD_ID ThisThreadId; 400 401 402 ACPI_FUNCTION_NAME (UtReleaseMutex); 403 404 405 ThisThreadId = AcpiOsGetThreadId (); 406 ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, 407 "Thread %X releasing Mutex [%s]\n", ThisThreadId, 408 AcpiUtGetMutexName (MutexId))); 409 410 if (MutexId > ACPI_MAX_MUTEX) 411 { 412 return (AE_BAD_PARAMETER); 413 } 414 415 /* 416 * Mutex must be acquired in order to release it! 417 */ 418 if (AcpiGbl_MutexInfo[MutexId].ThreadId == ACPI_MUTEX_NOT_ACQUIRED) 419 { 420 ACPI_ERROR ((AE_INFO, 421 "Mutex [%X] is not acquired, cannot release", MutexId)); 422 423 return (AE_NOT_ACQUIRED); 424 } 425 426 #ifdef ACPI_MUTEX_DEBUG 427 { 428 UINT32 i; 429 /* 430 * Mutex debug code, for internal debugging only. 431 * 432 * Deadlock prevention. Check if this thread owns any mutexes of value 433 * greater than this one. If so, the thread has violated the mutex 434 * ordering rule. This indicates a coding error somewhere in 435 * the ACPI subsystem code. 436 */ 437 for (i = MutexId; i < ACPI_NUM_MUTEX; i++) 438 { 439 if (AcpiGbl_MutexInfo[i].ThreadId == ThisThreadId) 440 { 441 if (i == MutexId) 442 { 443 continue; 444 } 445 446 ACPI_ERROR ((AE_INFO, 447 "Invalid release order: owns [%s], releasing [%s]", 448 AcpiUtGetMutexName (i), AcpiUtGetMutexName (MutexId))); 449 450 return (AE_RELEASE_DEADLOCK); 451 } 452 } 453 } 454 #endif 455 456 /* Mark unlocked FIRST */ 457 458 AcpiGbl_MutexInfo[MutexId].ThreadId = ACPI_MUTEX_NOT_ACQUIRED; 459 460 AcpiOsReleaseMutex (AcpiGbl_MutexInfo[MutexId].Mutex); 461 return (AE_OK); 462 } 463 464 465