drivers/acpi/events/evmisc.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evmisc - Miscellaneous event manager support functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, R. Byron Moore
   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 <acpi/acevents.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/acinterp.h>
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evmisc")
  51
  52 /* Names for Notify() values, used for debug output */
  53 #ifdef ACPI_DEBUG_OUTPUT
  54 static const char *acpi_notify_value_names[] = {
  55         "Bus Check",
  56         "Device Check",
  57         "Device Wake",
  58         "Eject Request",
  59         "Device Check Light",
  60         "Frequency Mismatch",
  61         "Bus Mode Mismatch",
  62         "Power Fault"
  63 };
  64 #endif
  65
  66 /* Local prototypes */
  67
  68 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
  69
  70 static void ACPI_SYSTEM_XFACE acpi_ev_global_lock_thread(void *context);
  71
  72 static u32 acpi_ev_global_lock_handler(void *context);
  73
  74 /*******************************************************************************
  75  *
  76  * FUNCTION:    acpi_ev_is_notify_object
  77  *
  78  * PARAMETERS:  Node            - Node to check
  79  *
  80  * RETURN:      TRUE if notifies allowed on this object
  81  *
  82  * DESCRIPTION: Check type of node for a object that supports notifies.
  83  *
  84  *              TBD: This could be replaced by a flag bit in the node.
  85  *
  86  ******************************************************************************/
  87
  88 u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
  89 {
  90         switch (node->type) {
  91         case ACPI_TYPE_DEVICE:
  92         case ACPI_TYPE_PROCESSOR:
  93         case ACPI_TYPE_POWER:
  94         case ACPI_TYPE_THERMAL:
  95                 /*
  96                  * These are the ONLY objects that can receive ACPI notifications
  97                  */
  98                 return (TRUE);
  99
 100         default:
 101                 return (FALSE);
 102         }
 103 }
 104
 105 /*******************************************************************************
 106  *
 107  * FUNCTION:    acpi_ev_queue_notify_request
 108  *
 109  * PARAMETERS:  Node            - NS node for the notified object
 110  *              notify_value    - Value from the Notify() request
 111  *
 112  * RETURN:      Status
 113  *
 114  * DESCRIPTION: Dispatch a device notification event to a previously
 115  *              installed handler.
 116  *
 117  ******************************************************************************/
 118
 119 acpi_status
 120 acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
 121                              u32 notify_value)
 122 {
 123         union acpi_operand_object *obj_desc;
 124         union acpi_operand_object *handler_obj = NULL;
 125         union acpi_generic_state *notify_info;
 126         acpi_status status = AE_OK;
 127
 128         ACPI_FUNCTION_NAME(ev_queue_notify_request);
 129
 130         /*
 131          * For value 3 (Ejection Request), some device method may need to be run.
 132          * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need
 133          *   to be run.
 134          * For value 0x80 (Status Change) on the power button or sleep button,
 135          *   initiate soft-off or sleep operation?
 136          */
 137         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 138                           "Dispatching Notify(%X) on node %p\n", notify_value,
 139                           node));
 140
 141         if (notify_value <= 7) {
 142                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notify value: %s\n",
 143                                   acpi_notify_value_names[notify_value]));
 144         } else {
 145                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 146                                   "Notify value: 0x%2.2X **Device Specific**\n",
 147                                   notify_value));
 148         }
 149
 150         /* Get the notify object attached to the NS Node */
 151
 152         obj_desc = acpi_ns_get_attached_object(node);
 153         if (obj_desc) {
 154
 155                 /* We have the notify object, Get the right handler */
 156
 157                 switch (node->type) {
 158                 case ACPI_TYPE_DEVICE:
 159                 case ACPI_TYPE_THERMAL:
 160                 case ACPI_TYPE_PROCESSOR:
 161                 case ACPI_TYPE_POWER:
 162
 163                         if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
 164                                 handler_obj =
 165                                     obj_desc->common_notify.system_notify;
 166                         } else {
 167                                 handler_obj =
 168                                     obj_desc->common_notify.device_notify;
 169                         }
 170                         break;
 171
 172                 default:
 173                         /* All other types are not supported */
 174                         return (AE_TYPE);
 175                 }
 176         }
 177
 178         /* If there is any handler to run, schedule the dispatcher */
 179
 180         if ((acpi_gbl_system_notify.handler
 181              && (notify_value <= ACPI_MAX_SYS_NOTIFY))
 182             || (acpi_gbl_device_notify.handler
 183                 && (notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) {
 184                 notify_info = acpi_ut_create_generic_state();
 185                 if (!notify_info) {
 186                         return (AE_NO_MEMORY);
 187                 }
 188
 189                 notify_info->common.descriptor_type =
 190                     ACPI_DESC_TYPE_STATE_NOTIFY;
 191                 notify_info->notify.node = node;
 192                 notify_info->notify.value = (u16) notify_value;
 193                 notify_info->notify.handler_obj = handler_obj;
 194
 195                 status =
 196                     acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch,
 197                                     notify_info);
 198                 if (ACPI_FAILURE(status)) {
 199                         acpi_ut_delete_generic_state(notify_info);
 200                 }
 201         }
 202
 203         if (!handler_obj) {
 204                 /*
 205                  * There is no per-device notify handler for this device.
 206                  * This may or may not be a problem.
 207                  */
 208                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 209                                   "No notify handler for Notify(%4.4s, %X) node %p\n",
 210                                   acpi_ut_get_node_name(node), notify_value,
 211                                   node));
 212         }
 213
 214         return (status);
 215 }
 216
 217 /*******************************************************************************
 218  *
 219  * FUNCTION:    acpi_ev_notify_dispatch
 220  *
 221  * PARAMETERS:  Context         - To be passed to the notify handler
 222  *
 223  * RETURN:      None.
 224  *
 225  * DESCRIPTION: Dispatch a device notification event to a previously
 226  *              installed handler.
 227  *
 228  ******************************************************************************/
 229
 230 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
 231 {
 232         union acpi_generic_state *notify_info =
 233             (union acpi_generic_state *)context;
 234         acpi_notify_handler global_handler = NULL;
 235         void *global_context = NULL;
 236         union acpi_operand_object *handler_obj;
 237
 238         ACPI_FUNCTION_ENTRY();
 239
 240         /*
 241          * We will invoke a global notify handler if installed.
 242          * This is done _before_ we invoke the per-device handler attached
 243          * to the device.
 244          */
 245         if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
 246
 247                 /* Global system notification handler */
 248
 249                 if (acpi_gbl_system_notify.handler) {
 250                         global_handler = acpi_gbl_system_notify.handler;
 251                         global_context = acpi_gbl_system_notify.context;
 252                 }
 253         } else {
 254                 /* Global driver notification handler */
 255
 256                 if (acpi_gbl_device_notify.handler) {
 257                         global_handler = acpi_gbl_device_notify.handler;
 258                         global_context = acpi_gbl_device_notify.context;
 259                 }
 260         }
 261
 262         /* Invoke the system handler first, if present */
 263
 264         if (global_handler) {
 265                 global_handler(notify_info->notify.node,
 266                                notify_info->notify.value, global_context);
 267         }
 268
 269         /* Now invoke the per-device handler, if present */
 270
 271         handler_obj = notify_info->notify.handler_obj;
 272         if (handler_obj) {
 273                 handler_obj->notify.handler(notify_info->notify.node,
 274                                             notify_info->notify.value,
 275                                             handler_obj->notify.context);
 276         }
 277
 278         /* All done with the info object */
 279
 280         acpi_ut_delete_generic_state(notify_info);
 281 }
 282
 283 /*******************************************************************************
 284  *
 285  * FUNCTION:    acpi_ev_global_lock_thread
 286  *
 287  * PARAMETERS:  Context         - From thread interface, not used
 288  *
 289  * RETURN:      None
 290  *
 291  * DESCRIPTION: Invoked by SCI interrupt handler upon acquisition of the
 292  *              Global Lock.  Simply signal all threads that are waiting
 293  *              for the lock.
 294  *
 295  ******************************************************************************/
 296
 297 static void ACPI_SYSTEM_XFACE acpi_ev_global_lock_thread(void *context)
 298 {
 299         acpi_status status;
 300
 301         /* Signal threads that are waiting for the lock */
 302
 303         if (acpi_gbl_global_lock_thread_count) {
 304
 305                 /* Send sufficient units to the semaphore */
 306
 307                 status =
 308                     acpi_os_signal_semaphore(acpi_gbl_global_lock_semaphore,
 309                                              acpi_gbl_global_lock_thread_count);
 310                 if (ACPI_FAILURE(status)) {
 311                         ACPI_ERROR((AE_INFO,
 312                                     "Could not signal Global Lock semaphore"));
 313                 }
 314         }
 315 }
 316
 317 /*******************************************************************************
 318  *
 319  * FUNCTION:    acpi_ev_global_lock_handler
 320  *
 321  * PARAMETERS:  Context         - From thread interface, not used
 322  *
 323  * RETURN:      ACPI_INTERRUPT_HANDLED or ACPI_INTERRUPT_NOT_HANDLED
 324  *
 325  * DESCRIPTION: Invoked directly from the SCI handler when a global lock
 326  *              release interrupt occurs.  Grab the global lock and queue
 327  *              the global lock thread for execution
 328  *
 329  ******************************************************************************/
 330
 331 static u32 acpi_ev_global_lock_handler(void *context)
 332 {
 333         u8 acquired = FALSE;
 334
 335         /*
 336          * Attempt to get the lock
 337          * If we don't get it now, it will be marked pending and we will
 338          * take another interrupt when it becomes free.
 339          */
 340         ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_common_fACS.global_lock, acquired);
 341         if (acquired) {
 342
 343                 /* Got the lock, now wake all threads waiting for it */
 344                 acpi_gbl_global_lock_acquired = TRUE;
 345                 acpi_ev_global_lock_thread(context);
 346         }
 347
 348         return (ACPI_INTERRUPT_HANDLED);
 349 }
 350
 351 /*******************************************************************************
 352  *
 353  * FUNCTION:    acpi_ev_init_global_lock_handler
 354  *
 355  * PARAMETERS:  None
 356  *
 357  * RETURN:      Status
 358  *
 359  * DESCRIPTION: Install a handler for the global lock release event
 360  *
 361  ******************************************************************************/
 362
 363 acpi_status acpi_ev_init_global_lock_handler(void)
 364 {
 365         acpi_status status;
 366
 367         ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
 368
 369         acpi_gbl_global_lock_present = TRUE;
 370         status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
 371                                                   acpi_ev_global_lock_handler,
 372                                                   NULL);
 373
 374         /*
 375          * If the global lock does not exist on this platform, the attempt
 376          * to enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick)
 377          * Map to AE_OK, but mark global lock as not present.
 378          * Any attempt to actually use the global lock will be flagged
 379          * with an error.
 380          */
 381         if (status == AE_NO_HARDWARE_RESPONSE) {
 382                 ACPI_ERROR((AE_INFO,
 383                             "No response from Global Lock hardware, disabling lock"));
 384
 385                 acpi_gbl_global_lock_present = FALSE;
 386                 status = AE_OK;
 387         }
 388
 389         return_ACPI_STATUS(status);
 390 }
 391
 392 /******************************************************************************
 393  *
 394  * FUNCTION:    acpi_ev_acquire_global_lock
 395  *
 396  * PARAMETERS:  Timeout         - Max time to wait for the lock, in millisec.
 397  *
 398  * RETURN:      Status
 399  *
 400  * DESCRIPTION: Attempt to gain ownership of the Global Lock.
 401  *
 402  *****************************************************************************/
 403
 404 acpi_status acpi_ev_acquire_global_lock(u16 timeout)
 405 {
 406         acpi_status status = AE_OK;
 407         u8 acquired = FALSE;
 408
 409         ACPI_FUNCTION_TRACE(ev_acquire_global_lock);
 410
 411 #ifndef ACPI_APPLICATION
 412         /* Make sure that we actually have a global lock */
 413
 414         if (!acpi_gbl_global_lock_present) {
 415                 return_ACPI_STATUS(AE_NO_GLOBAL_LOCK);
 416         }
 417 #endif
 418
 419         /* One more thread wants the global lock */
 420
 421         acpi_gbl_global_lock_thread_count++;
 422
 423         /*
 424          * If we (OS side vs. BIOS side) have the hardware lock already,
 425          * we are done
 426          */
 427         if (acpi_gbl_global_lock_acquired) {
 428                 return_ACPI_STATUS(AE_OK);
 429         }
 430
 431         /* We must acquire the actual hardware lock */
 432
 433         ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_common_fACS.global_lock, acquired);
 434         if (acquired) {
 435
 436                 /* We got the lock */
 437
 438                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 439                                   "Acquired the HW Global Lock\n"));
 440
 441                 acpi_gbl_global_lock_acquired = TRUE;
 442                 return_ACPI_STATUS(AE_OK);
 443         }
 444
 445         /*
 446          * Did not get the lock.  The pending bit was set above, and we must now
 447          * wait until we get the global lock released interrupt.
 448          */
 449         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Waiting for the HW Global Lock\n"));
 450
 451         /*
 452          * Acquire the global lock semaphore first.
 453          * Since this wait will block, we must release the interpreter
 454          */
 455         status =
 456             acpi_ex_system_wait_semaphore(acpi_gbl_global_lock_semaphore,
 457                                           timeout);
 458         return_ACPI_STATUS(status);
 459 }
 460
 461 /*******************************************************************************
 462  *
 463  * FUNCTION:    acpi_ev_release_global_lock
 464  *
 465  * PARAMETERS:  None
 466  *
 467  * RETURN:      Status
 468  *
 469  * DESCRIPTION: Releases ownership of the Global Lock.
 470  *
 471  ******************************************************************************/
 472
 473 acpi_status acpi_ev_release_global_lock(void)
 474 {
 475         u8 pending = FALSE;
 476         acpi_status status = AE_OK;
 477
 478         ACPI_FUNCTION_TRACE(ev_release_global_lock);
 479
 480         if (!acpi_gbl_global_lock_thread_count) {
 481                 ACPI_WARNING((AE_INFO,
 482                               "Cannot release HW Global Lock, it has not been acquired"));
 483                 return_ACPI_STATUS(AE_NOT_ACQUIRED);
 484         }
 485
 486         /* One fewer thread has the global lock */
 487
 488         acpi_gbl_global_lock_thread_count--;
 489         if (acpi_gbl_global_lock_thread_count) {
 490
 491                 /* There are still some threads holding the lock, cannot release */
 492
 493                 return_ACPI_STATUS(AE_OK);
 494         }
 495
 496         /*
 497          * No more threads holding lock, we can do the actual hardware
 498          * release
 499          */
 500         ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_common_fACS.global_lock, pending);
 501         acpi_gbl_global_lock_acquired = FALSE;
 502
 503         /*
 504          * If the pending bit was set, we must write GBL_RLS to the control
 505          * register
 506          */
 507         if (pending) {
 508                 status = acpi_set_register(ACPI_BITREG_GLOBAL_LOCK_RELEASE,
 509                                            1, ACPI_MTX_LOCK);
 510         }
 511
 512         return_ACPI_STATUS(status);
 513 }
 514
 515 /******************************************************************************
 516  *
 517  * FUNCTION:    acpi_ev_terminate
 518  *
 519  * PARAMETERS:  none
 520  *
 521  * RETURN:      none
 522  *
 523  * DESCRIPTION: Disable events and free memory allocated for table storage.
 524  *
 525  ******************************************************************************/
 526
 527 void acpi_ev_terminate(void)
 528 {
 529         acpi_native_uint i;
 530         acpi_status status;
 531
 532         ACPI_FUNCTION_TRACE(ev_terminate);
 533
 534         if (acpi_gbl_events_initialized) {
 535                 /*
 536                  * Disable all event-related functionality.
 537                  * In all cases, on error, print a message but obviously we don't abort.
 538                  */
 539
 540                 /* Disable all fixed events */
 541
 542                 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 543                         status = acpi_disable_event((u32) i, 0);
 544                         if (ACPI_FAILURE(status)) {
 545                                 ACPI_ERROR((AE_INFO,
 546                                             "Could not disable fixed event %d",
 547                                             (u32) i));
 548                         }
 549                 }
 550
 551                 /* Disable all GPEs in all GPE blocks */
 552
 553                 status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block);
 554
 555                 /* Remove SCI handler */
 556
 557                 status = acpi_ev_remove_sci_handler();
 558                 if (ACPI_FAILURE(status)) {
 559                         ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
 560                 }
 561         }
 562
 563         /* Deallocate all handler objects installed within GPE info structs */
 564
 565         status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers);
 566
 567         /* Return to original mode if necessary */
 568
 569         if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
 570                 status = acpi_disable();
 571                 if (ACPI_FAILURE(status)) {
 572                         ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
 573                 }
 574         }
 575         return_VOID;
 576 }