drivers/acpi/acpica/utmutex.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utmutex - local mutex support
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, Intel Corp.
   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
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46
  47 #define _COMPONENT          ACPI_UTILITIES
  48 ACPI_MODULE_NAME("utmutex")
  49
  50 /* Local prototypes */
  51 static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id);
  52
  53 static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ut_mutex_initialize
  58  *
  59  * PARAMETERS:  None.
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Create the system mutex objects. This includes mutexes,
  64  *              spin locks, and reader/writer locks.
  65  *
  66  ******************************************************************************/
  67
  68 acpi_status acpi_ut_mutex_initialize(void)
  69 {
  70         u32 i;
  71         acpi_status status;
  72
  73         ACPI_FUNCTION_TRACE(ut_mutex_initialize);
  74
  75         /* Create each of the predefined mutex objects */
  76
  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);
  81                 }
  82         }
  83
  84         /* Create the spinlocks for use at interrupt level or for speed */
  85
  86         status = acpi_os_create_lock (&acpi_gbl_gpe_lock);
  87         if (ACPI_FAILURE (status)) {
  88                 return_ACPI_STATUS (status);
  89         }
  90
  91         status = acpi_os_create_lock (&acpi_gbl_hardware_lock);
  92         if (ACPI_FAILURE (status)) {
  93                 return_ACPI_STATUS (status);
  94         }
  95
  96         status = acpi_os_create_lock(&acpi_gbl_reference_count_lock);
  97         if (ACPI_FAILURE(status)) {
  98                 return_ACPI_STATUS(status);
  99         }
 100
 101         /* Mutex for _OSI support */
 102
 103         status = acpi_os_create_mutex(&acpi_gbl_osi_mutex);
 104         if (ACPI_FAILURE(status)) {
 105                 return_ACPI_STATUS(status);
 106         }
 107
 108         /* Create the reader/writer lock for namespace access */
 109
 110         status = acpi_ut_create_rw_lock(&acpi_gbl_namespace_rw_lock);
 111         if (ACPI_FAILURE(status)) {
 112                 return_ACPI_STATUS(status);
 113         }
 114
 115         return_ACPI_STATUS(status);
 116 }
 117
 118 /*******************************************************************************
 119  *
 120  * FUNCTION:    acpi_ut_mutex_terminate
 121  *
 122  * PARAMETERS:  None.
 123  *
 124  * RETURN:      None.
 125  *
 126  * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
 127  *              spin locks, and reader/writer locks.
 128  *
 129  ******************************************************************************/
 130
 131 void acpi_ut_mutex_terminate(void)
 132 {
 133         u32 i;
 134
 135         ACPI_FUNCTION_TRACE(ut_mutex_terminate);
 136
 137         /* Delete each predefined mutex object */
 138
 139         for (i = 0; i < ACPI_NUM_MUTEX; i++) {
 140                 acpi_ut_delete_mutex(i);
 141         }
 142
 143         acpi_os_delete_mutex(acpi_gbl_osi_mutex);
 144
 145         /* Delete the spinlocks */
 146
 147         acpi_os_delete_lock(acpi_gbl_gpe_lock);
 148         acpi_os_delete_lock(acpi_gbl_hardware_lock);
 149         acpi_os_delete_lock(acpi_gbl_reference_count_lock);
 150
 151         /* Delete the reader/writer lock */
 152
 153         acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_lock);
 154         return_VOID;
 155 }
 156
 157 /*******************************************************************************
 158  *
 159  * FUNCTION:    acpi_ut_create_mutex
 160  *
 161  * PARAMETERS:  mutex_ID        - ID of the mutex to be created
 162  *
 163  * RETURN:      Status
 164  *
 165  * DESCRIPTION: Create a mutex object.
 166  *
 167  ******************************************************************************/
 168
 169 static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id)
 170 {
 171         acpi_status status = AE_OK;
 172
 173         ACPI_FUNCTION_TRACE_U32(ut_create_mutex, mutex_id);
 174
 175         if (!acpi_gbl_mutex_info[mutex_id].mutex) {
 176                 status =
 177                     acpi_os_create_mutex(&acpi_gbl_mutex_info[mutex_id].mutex);
 178                 acpi_gbl_mutex_info[mutex_id].thread_id =
 179                     ACPI_MUTEX_NOT_ACQUIRED;
 180                 acpi_gbl_mutex_info[mutex_id].use_count = 0;
 181         }
 182
 183         return_ACPI_STATUS(status);
 184 }
 185
 186 /*******************************************************************************
 187  *
 188  * FUNCTION:    acpi_ut_delete_mutex
 189  *
 190  * PARAMETERS:  mutex_ID        - ID of the mutex to be deleted
 191  *
 192  * RETURN:      Status
 193  *
 194  * DESCRIPTION: Delete a mutex object.
 195  *
 196  ******************************************************************************/
 197
 198 static void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
 199 {
 200
 201         ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
 202
 203         acpi_os_delete_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
 204
 205         acpi_gbl_mutex_info[mutex_id].mutex = NULL;
 206         acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
 207
 208         return_VOID;
 209 }
 210
 211 /*******************************************************************************
 212  *
 213  * FUNCTION:    acpi_ut_acquire_mutex
 214  *
 215  * PARAMETERS:  mutex_ID        - ID of the mutex to be acquired
 216  *
 217  * RETURN:      Status
 218  *
 219  * DESCRIPTION: Acquire a mutex object.
 220  *
 221  ******************************************************************************/
 222
 223 acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
 224 {
 225         acpi_status status;
 226         acpi_thread_id this_thread_id;
 227
 228         ACPI_FUNCTION_NAME(ut_acquire_mutex);
 229
 230         if (mutex_id > ACPI_MAX_MUTEX) {
 231                 return (AE_BAD_PARAMETER);
 232         }
 233
 234         this_thread_id = acpi_os_get_thread_id();
 235
 236 #ifdef ACPI_MUTEX_DEBUG
 237         {
 238                 u32 i;
 239                 /*
 240                  * Mutex debug code, for internal debugging only.
 241                  *
 242                  * Deadlock prevention. Check if this thread owns any mutexes of value
 243                  * greater than or equal to this one. If so, the thread has violated
 244                  * the mutex ordering rule. This indicates a coding error somewhere in
 245                  * the ACPI subsystem code.
 246                  */
 247                 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
 248                         if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
 249                                 if (i == mutex_id) {
 250                                         ACPI_ERROR((AE_INFO,
 251                                                     "Mutex [%s] already acquired by this thread [%u]",
 252                                                     acpi_ut_get_mutex_name
 253                                                     (mutex_id),
 254                                                     (u32)this_thread_id));
 255
 256                                         return (AE_ALREADY_ACQUIRED);
 257                                 }
 258
 259                                 ACPI_ERROR((AE_INFO,
 260                                             "Invalid acquire order: Thread %u owns [%s], wants [%s]",
 261                                             (u32)this_thread_id,
 262                                             acpi_ut_get_mutex_name(i),
 263                                             acpi_ut_get_mutex_name(mutex_id)));
 264
 265                                 return (AE_ACQUIRE_DEADLOCK);
 266                         }
 267                 }
 268         }
 269 #endif
 270
 271         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 272                           "Thread %u attempting to acquire Mutex [%s]\n",
 273                           (u32)this_thread_id,
 274                           acpi_ut_get_mutex_name(mutex_id)));
 275
 276         status =
 277             acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex,
 278                                   ACPI_WAIT_FOREVER);
 279         if (ACPI_SUCCESS(status)) {
 280                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 281                                   "Thread %u acquired Mutex [%s]\n",
 282                                   (u32)this_thread_id,
 283                                   acpi_ut_get_mutex_name(mutex_id)));
 284
 285                 acpi_gbl_mutex_info[mutex_id].use_count++;
 286                 acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id;
 287         } else {
 288                 ACPI_EXCEPTION((AE_INFO, status,
 289                                 "Thread %u could not acquire Mutex [0x%X]",
 290                                 (u32)this_thread_id, mutex_id));
 291         }
 292
 293         return (status);
 294 }
 295
 296 /*******************************************************************************
 297  *
 298  * FUNCTION:    acpi_ut_release_mutex
 299  *
 300  * PARAMETERS:  mutex_ID        - ID of the mutex to be released
 301  *
 302  * RETURN:      Status
 303  *
 304  * DESCRIPTION: Release a mutex object.
 305  *
 306  ******************************************************************************/
 307
 308 acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
 309 {
 310         ACPI_FUNCTION_NAME(ut_release_mutex);
 311
 312         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
 313                           (u32)acpi_os_get_thread_id(),
 314                           acpi_ut_get_mutex_name(mutex_id)));
 315
 316         if (mutex_id > ACPI_MAX_MUTEX) {
 317                 return (AE_BAD_PARAMETER);
 318         }
 319
 320         /*
 321          * Mutex must be acquired in order to release it!
 322          */
 323         if (acpi_gbl_mutex_info[mutex_id].thread_id == ACPI_MUTEX_NOT_ACQUIRED) {
 324                 ACPI_ERROR((AE_INFO,
 325                             "Mutex [0x%X] is not acquired, cannot release",
 326                             mutex_id));
 327
 328                 return (AE_NOT_ACQUIRED);
 329         }
 330 #ifdef ACPI_MUTEX_DEBUG
 331         {
 332                 u32 i;
 333                 /*
 334                  * Mutex debug code, for internal debugging only.
 335                  *
 336                  * Deadlock prevention. Check if this thread owns any mutexes of value
 337                  * greater than this one. If so, the thread has violated the mutex
 338                  * ordering rule. This indicates a coding error somewhere in
 339                  * the ACPI subsystem code.
 340                  */
 341                 for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) {
 342                         if (acpi_gbl_mutex_info[i].thread_id ==
 343                             acpi_os_get_thread_id()) {
 344                                 if (i == mutex_id) {
 345                                         continue;
 346                                 }
 347
 348                                 ACPI_ERROR((AE_INFO,
 349                                             "Invalid release order: owns [%s], releasing [%s]",
 350                                             acpi_ut_get_mutex_name(i),
 351                                             acpi_ut_get_mutex_name(mutex_id)));
 352
 353                                 return (AE_RELEASE_DEADLOCK);
 354                         }
 355                 }
 356         }
 357 #endif
 358
 359         /* Mark unlocked FIRST */
 360
 361         acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
 362
 363         acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
 364         return (AE_OK);
 365 }