1 /******************************************************************************* 2 * 3 * Module Name: utxfmutex - external AML mutex access functions 4 * 5 ******************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152 #include "acpi.h" 153 #include "accommon.h" 154 #include "acnamesp.h" 155 156 157 #define _COMPONENT ACPI_UTILITIES 158 ACPI_MODULE_NAME ("utxfmutex") 159 160 161 /* Local prototypes */ 162 163 static ACPI_STATUS 164 AcpiUtGetMutexObject ( 165 ACPI_HANDLE Handle, 166 ACPI_STRING Pathname, 167 ACPI_OPERAND_OBJECT **RetObj); 168 169 170 /******************************************************************************* 171 * 172 * FUNCTION: AcpiUtGetMutexObject 173 * 174 * PARAMETERS: Handle - Mutex or prefix handle (optional) 175 * Pathname - Mutex pathname (optional) 176 * RetObj - Where the mutex object is returned 177 * 178 * RETURN: Status 179 * 180 * DESCRIPTION: Get an AML mutex object. The mutex node is pointed to by 181 * Handle:Pathname. Either Handle or Pathname can be NULL, but 182 * not both. 183 * 184 ******************************************************************************/ 185 186 static ACPI_STATUS 187 AcpiUtGetMutexObject ( 188 ACPI_HANDLE Handle, 189 ACPI_STRING Pathname, 190 ACPI_OPERAND_OBJECT **RetObj) 191 { 192 ACPI_NAMESPACE_NODE *MutexNode; 193 ACPI_OPERAND_OBJECT *MutexObj; 194 ACPI_STATUS Status; 195 196 197 /* Parameter validation */ 198 199 if (!RetObj || (!Handle && !Pathname)) 200 { 201 return (AE_BAD_PARAMETER); 202 } 203 204 /* Get a the namespace node for the mutex */ 205 206 MutexNode = Handle; 207 if (Pathname != NULL) 208 { 209 Status = AcpiGetHandle ( 210 Handle, Pathname, ACPI_CAST_PTR (ACPI_HANDLE, &MutexNode)); 211 if (ACPI_FAILURE (Status)) 212 { 213 return (Status); 214 } 215 } 216 217 /* Ensure that we actually have a Mutex object */ 218 219 if (!MutexNode || 220 (MutexNode->Type != ACPI_TYPE_MUTEX)) 221 { 222 return (AE_TYPE); 223 } 224 225 /* Get the low-level mutex object */ 226 227 MutexObj = AcpiNsGetAttachedObject (MutexNode); 228 if (!MutexObj) 229 { 230 return (AE_NULL_OBJECT); 231 } 232 233 *RetObj = MutexObj; 234 return (AE_OK); 235 } 236 237 238 /******************************************************************************* 239 * 240 * FUNCTION: AcpiAcquireMutex 241 * 242 * PARAMETERS: Handle - Mutex or prefix handle (optional) 243 * Pathname - Mutex pathname (optional) 244 * Timeout - Max time to wait for the lock (millisec) 245 * 246 * RETURN: Status 247 * 248 * DESCRIPTION: Acquire an AML mutex. This is a device driver interface to 249 * AML mutex objects, and allows for transaction locking between 250 * drivers and AML code. The mutex node is pointed to by 251 * Handle:Pathname. Either Handle or Pathname can be NULL, but 252 * not both. 253 * 254 ******************************************************************************/ 255 256 ACPI_STATUS 257 AcpiAcquireMutex ( 258 ACPI_HANDLE Handle, 259 ACPI_STRING Pathname, 260 UINT16 Timeout) 261 { 262 ACPI_STATUS Status; 263 ACPI_OPERAND_OBJECT *MutexObj; 264 265 266 /* Get the low-level mutex associated with Handle:Pathname */ 267 268 Status = AcpiUtGetMutexObject (Handle, Pathname, &MutexObj); 269 if (ACPI_FAILURE (Status)) 270 { 271 return (Status); 272 } 273 274 /* Acquire the OS mutex */ 275 276 Status = AcpiOsAcquireMutex (MutexObj->Mutex.OsMutex, Timeout); 277 return (Status); 278 } 279 280 ACPI_EXPORT_SYMBOL (AcpiAcquireMutex) 281 282 283 /******************************************************************************* 284 * 285 * FUNCTION: AcpiReleaseMutex 286 * 287 * PARAMETERS: Handle - Mutex or prefix handle (optional) 288 * Pathname - Mutex pathname (optional) 289 * 290 * RETURN: Status 291 * 292 * DESCRIPTION: Release an AML mutex. This is a device driver interface to 293 * AML mutex objects, and allows for transaction locking between 294 * drivers and AML code. The mutex node is pointed to by 295 * Handle:Pathname. Either Handle or Pathname can be NULL, but 296 * not both. 297 * 298 ******************************************************************************/ 299 300 ACPI_STATUS 301 AcpiReleaseMutex ( 302 ACPI_HANDLE Handle, 303 ACPI_STRING Pathname) 304 { 305 ACPI_STATUS Status; 306 ACPI_OPERAND_OBJECT *MutexObj; 307 308 309 /* Get the low-level mutex associated with Handle:Pathname */ 310 311 Status = AcpiUtGetMutexObject (Handle, Pathname, &MutexObj); 312 if (ACPI_FAILURE (Status)) 313 { 314 return (Status); 315 } 316 317 /* Release the OS mutex */ 318 319 AcpiOsReleaseMutex (MutexObj->Mutex.OsMutex); 320 return (AE_OK); 321 } 322 323 ACPI_EXPORT_SYMBOL (AcpiReleaseMutex) 324