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 #ifdef ACPI_DEBUG_OUTPUT
  53 static const char *acpi_notify_value_names[] = {
  54         "Bus Check",
  55         "Device Check",
  56         "Device Wake",
  57         "Eject request",
  58         "Device Check Light",
  59         "Frequency Mismatch",
  60         "Bus Mode Mismatch",
  61         "Power Fault"
  62 };
  63 #endif
  64
  65 /* Local prototypes */
  66
  67 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
  68
  69 static void ACPI_SYSTEM_XFACE acpi_ev_global_lock_thread(void *context);
  70
  71 static u32 acpi_ev_global_lock_handler(void *context);
  72
  73 /*******************************************************************************
  74  *
  75  * FUNCTION:    acpi_ev_is_notify_object
  76  *
  77  * PARAMETERS:  Node            - Node to check
  78  *
  79  * RETURN:      TRUE if notifies allowed on this object
  80  *
  81  * DESCRIPTION: Check type of node for a object that supports notifies.
  82  *
  83  *              TBD: This could be replaced by a flag bit in the node.
  84  *
  85  ******************************************************************************/
  86
  87 u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
  88 {
  89         switch (node->type) {
  90         case ACPI_TYPE_DEVICE:
  91         case ACPI_TYPE_PROCESSOR:
  92         case ACPI_TYPE_POWER:
  93         case ACPI_TYPE_THERMAL:
  94                 /*
  95                  * These are the ONLY objects that can receive ACPI notifications
  96                  */
  97                 return (TRUE);
  98
  99         default:
 100                 return (FALSE);
 101         }
 102 }
 103
 104 /*******************************************************************************
 105  *
 106  * FUNCTION:    acpi_ev_queue_notify_request
 107  *
 108  * PARAMETERS:  Node            - NS node for the notified object
 109  *              notify_value    - Value from the Notify() request
 110  *
 111  * RETURN:      Status
 112  *
 113  * DESCRIPTION: Dispatch a device notification event to a previously
 114  *              installed handler.
 115  *
 116  ******************************************************************************/
 117
 118 acpi_status
 119 acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
 120                              u32 notify_value)
 121 {
 122         union acpi_operand_object *obj_desc;
 123         union acpi_operand_object *handler_obj = NULL;
 124         union acpi_generic_state *notify_info;
 125         acpi_status status = AE_OK;
 126
 127         ACPI_FUNCTION_NAME("ev_queue_notify_request");
 128
 129         /*
 130          * For value 3 (Ejection Request), some device method may need to be run.
 131          * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need
 132          *   to be run.
 133          * For value 0x80 (Status Change) on the power button or sleep button,
 134          *   initiate soft-off or sleep operation?
 135          */
 136         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 137                           "Dispatching Notify(%X) on node %p\n", notify_value,
 138                           node));
 139
 140         if (notify_value <= 7) {
 141                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notify value: %s\n",
 142                                   acpi_notify_value_names[notify_value]));
 143         } else {
 144                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 145                                   "Notify value: 0x%2.2X **Device Specific**\n",
 146                                   notify_value));
 147         }
 148
 149         /* Get the notify object attached to the NS Node */
 150
 151         obj_desc = acpi_ns_get_attached_object(node);
 152         if (obj_desc) {
 153                 /* We have the notify object, Get the right handler */
 154
 155                 switch (node->type) {
 156                 case ACPI_TYPE_DEVICE:
 157                 case ACPI_TYPE_THERMAL:
 158                 case ACPI_TYPE_PROCESSOR:
 159                 case ACPI_TYPE_POWER:
 160
 161                         if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
 162                                 handler_obj =
 163                                     obj_desc->common_notify.system_notify;
 164                         } else {
 165                                 handler_obj =
 166                                     obj_desc->common_notify.device_notify;
 167                         }
 168                         break;
 169
 170                 default:
 171                         /* All other types are not supported */
 172                         return (AE_TYPE);
 173                 }
 174         }
 175
 176         /* If there is any handler to run, schedule the dispatcher */
 177
 178         if ((acpi_gbl_system_notify.handler
 179              && (notify_value <= ACPI_MAX_SYS_NOTIFY))
 180             || (acpi_gbl_device_notify.handler
 181                 && (notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) {
 182                 notify_info = acpi_ut_create_generic_state();
 183                 if (!notify_info) {
 184                         return (AE_NO_MEMORY);
 185                 }
 186
 187                 notify_info->common.data_type = ACPI_DESC_TYPE_STATE_NOTIFY;
 188                 notify_info->notify.node = node;
 189                 notify_info->notify.value = (u16) notify_value;
 190                 notify_info->notify.handler_obj = handler_obj;
 191
 192                 status = acpi_os_queue_for_execution(OSD_PRIORITY_HIGH,
 193                                                      acpi_ev_notify_dispatch,
 194                                                      notify_info);
 195                 if (ACPI_FAILURE(status)) {
 196                         acpi_ut_delete_generic_state(notify_info);
 197                 }
 198         }
 199
 200         if (!handler_obj) {
 201                 /*
 202                  * There is no per-device notify handler for this device.
 203                  * This may or may not be a problem.
 204                  */
 205                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 206                                   "No notify handler for Notify(%4.4s, %X) node %p\n",
 207                                   acpi_ut_get_node_name(node), notify_value,
 208                                   node));
 209         }
 210
 211         return (status);
 212 }
 213
 214 /*******************************************************************************
 215  *
 216  * FUNCTION:    acpi_ev_notify_dispatch
 217  *
 218  * PARAMETERS:  Context         - To be passed to the notify handler
 219  *
 220  * RETURN:      None.
 221  *
 222  * DESCRIPTION: Dispatch a device notification event to a previously
 223  *              installed handler.
 224  *
 225  ******************************************************************************/
 226
 227 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
 228 {
 229         union acpi_generic_state *notify_info =
 230             (union acpi_generic_state *)context;
 231         acpi_notify_handler global_handler = NULL;
 232         void *global_context = NULL;
 233         union acpi_operand_object *handler_obj;
 234
 235         ACPI_FUNCTION_ENTRY();
 236
 237         /*
 238          * We will invoke a global notify handler if installed.
 239          * This is done _before_ we invoke the per-device handler attached
 240          * to the device.
 241          */
 242         if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
 243                 /* Global system notification handler */
 244
 245                 if (acpi_gbl_system_notify.handler) {
 246                         global_handler = acpi_gbl_system_notify.handler;
 247                         global_context = acpi_gbl_system_notify.context;
 248                 }
 249         } else {
 250                 /* Global driver notification handler */
 251
 252                 if (acpi_gbl_device_notify.handler) {
 253                         global_handler = acpi_gbl_device_notify.handler;
 254                         global_context = acpi_gbl_device_notify.context;
 255                 }
 256         }
 257
 258         /* Invoke the system handler first, if present */
 259
 260         if (global_handler) {
 261                 global_handler(notify_info->notify.node,
 262                                notify_info->notify.value, global_context);
 263         }
 264
 265         /* Now invoke the per-device handler, if present */
 266
 267         handler_obj = notify_info->notify.handler_obj;
 268         if (handler_obj) {
 269                 handler_obj->notify.handler(notify_info->notify.node,
 270                                             notify_info->notify.value,
 271                                             handler_obj->notify.context);
 272         }
 273
 274         /* All done with the info object */
 275
 276         acpi_ut_delete_generic_state(notify_info);
 277 }
 278
 279 /*******************************************************************************
 280  *
 281  * FUNCTION:    acpi_ev_global_lock_thread
 282  *
 283  * PARAMETERS:  Context         - From thread interface, not used
 284  *
 285  * RETURN:      None
 286  *
 287  * DESCRIPTION: Invoked by SCI interrupt handler upon acquisition of the
 288  *              Global Lock.  Simply signal all threads that are waiting
 289  *              for the lock.
 290  *
 291  ******************************************************************************/
 292
 293 static void ACPI_SYSTEM_XFACE acpi_ev_global_lock_thread(void *context)
 294 {
 295         acpi_status status;
 296
 297         /* Signal threads that are waiting for the lock */
 298
 299         if (acpi_gbl_global_lock_thread_count) {
 300                 /* Send sufficient units to the semaphore */
 301
 302                 status =
 303                     acpi_os_signal_semaphore(acpi_gbl_global_lock_semaphore,
 304                                              acpi_gbl_global_lock_thread_count);
 305                 if (ACPI_FAILURE(status)) {
 306                         ACPI_ERROR((AE_INFO,
 307                                     "Could not signal Global Lock semaphore"));
 308                 }
 309         }
 310 }
 311
 312 /*******************************************************************************
 313  *
 314  * FUNCTION:    acpi_ev_global_lock_handler
 315  *
 316  * PARAMETERS:  Context         - From thread interface, not used
 317  *
 318  * RETURN:      ACPI_INTERRUPT_HANDLED or ACPI_INTERRUPT_NOT_HANDLED
 319  *
 320  * DESCRIPTION: Invoked directly from the SCI handler when a global lock
 321  *              release interrupt occurs.  Grab the global lock and queue
 322  *              the global lock thread for execution
 323  *
 324  ******************************************************************************/
 325
 326 static u32 acpi_ev_global_lock_handler(void *context)
 327 {
 328         u8 acquired = FALSE;
 329         acpi_status status;
 330
 331         /*
 332          * Attempt to get the lock
 333          * If we don't get it now, it will be marked pending and we will
 334          * take another interrupt when it becomes free.
 335          */
 336         ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_common_fACS.global_lock, acquired);
 337         if (acquired) {
 338                 /* Got the lock, now wake all threads waiting for it */
 339
 340                 acpi_gbl_global_lock_acquired = TRUE;
 341
 342                 /* Run the Global Lock thread which will signal all waiting threads */
 343
 344                 status = acpi_os_queue_for_execution(OSD_PRIORITY_HIGH,
 345                                                      acpi_ev_global_lock_thread,
 346                                                      context);
 347                 if (ACPI_FAILURE(status)) {
 348                         ACPI_EXCEPTION((AE_INFO, status,
 349                                         "Could not queue Global Lock thread"));
 350
 351                         return (ACPI_INTERRUPT_NOT_HANDLED);
 352                 }
 353         }
 354
 355         return (ACPI_INTERRUPT_HANDLED);
 356 }
 357
 358 /*******************************************************************************
 359  *
 360  * FUNCTION:    acpi_ev_init_global_lock_handler
 361  *
 362  * PARAMETERS:  None
 363  *
 364  * RETURN:      Status
 365  *
 366  * DESCRIPTION: Install a handler for the global lock release event
 367  *
 368  ******************************************************************************/
 369
 370 acpi_status acpi_ev_init_global_lock_handler(void)
 371 {
 372         acpi_status status;
 373
 374         ACPI_FUNCTION_TRACE("ev_init_global_lock_handler");
 375
 376         acpi_gbl_global_lock_present = TRUE;
 377         status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
 378                                                   acpi_ev_global_lock_handler,
 379                                                   NULL);
 380
 381         /*
 382          * If the global lock does not exist on this platform, the attempt
 383          * to enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick)
 384          * Map to AE_OK, but mark global lock as not present.
 385          * Any attempt to actually use the global lock will be flagged
 386          * with an error.
 387          */
 388         if (status == AE_NO_HARDWARE_RESPONSE) {
 389                 ACPI_ERROR((AE_INFO,
 390                             "No response from Global Lock hardware, disabling lock"));
 391
 392                 acpi_gbl_global_lock_present = FALSE;
 393                 status = AE_OK;
 394         }
 395
 396         return_ACPI_STATUS(status);
 397 }
 398
 399 /******************************************************************************
 400  *
 401  * FUNCTION:    acpi_ev_acquire_global_lock
 402  *
 403  * PARAMETERS:  Timeout         - Max time to wait for the lock, in millisec.
 404  *
 405  * RETURN:      Status
 406  *
 407  * DESCRIPTION: Attempt to gain ownership of the Global Lock.
 408  *
 409  *****************************************************************************/
 410
 411 acpi_status acpi_ev_acquire_global_lock(u16 timeout)
 412 {
 413         acpi_status status = AE_OK;
 414         u8 acquired = FALSE;
 415
 416         ACPI_FUNCTION_TRACE("ev_acquire_global_lock");
 417
 418 #ifndef ACPI_APPLICATION
 419         /* Make sure that we actually have a global lock */
 420
 421         if (!acpi_gbl_global_lock_present) {
 422                 return_ACPI_STATUS(AE_NO_GLOBAL_LOCK);
 423         }
 424 #endif
 425
 426         /* One more thread wants the global lock */
 427
 428         acpi_gbl_global_lock_thread_count++;
 429
 430         /*
 431          * If we (OS side vs. BIOS side) have the hardware lock already,
 432          * we are done
 433          */
 434         if (acpi_gbl_global_lock_acquired) {
 435                 return_ACPI_STATUS(AE_OK);
 436         }
 437
 438         /* We must acquire the actual hardware lock */
 439
 440         ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_common_fACS.global_lock, acquired);
 441         if (acquired) {
 442                 /* We got the lock */
 443
 444                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 445                                   "Acquired the HW Global Lock\n"));
 446
 447                 acpi_gbl_global_lock_acquired = TRUE;
 448                 return_ACPI_STATUS(AE_OK);
 449         }
 450
 451         /*
 452          * Did not get the lock.  The pending bit was set above, and we must now
 453          * wait until we get the global lock released interrupt.
 454          */
 455         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Waiting for the HW Global Lock\n"));
 456
 457         /*
 458          * Acquire the global lock semaphore first.
 459          * Since this wait will block, we must release the interpreter
 460          */
 461         status = acpi_ex_system_wait_semaphore(acpi_gbl_global_lock_semaphore,
 462                                                timeout);
 463         return_ACPI_STATUS(status);
 464 }
 465
 466 /*******************************************************************************
 467  *
 468  * FUNCTION:    acpi_ev_release_global_lock
 469  *
 470  * PARAMETERS:  None
 471  *
 472  * RETURN:      Status
 473  *
 474  * DESCRIPTION: Releases ownership of the Global Lock.
 475  *
 476  ******************************************************************************/
 477
 478 acpi_status acpi_ev_release_global_lock(void)
 479 {
 480         u8 pending = FALSE;
 481         acpi_status status = AE_OK;
 482
 483         ACPI_FUNCTION_TRACE("ev_release_global_lock");
 484
 485         if (!acpi_gbl_global_lock_thread_count) {
 486                 ACPI_WARNING((AE_INFO,
 487                               "Cannot release HW Global Lock, it has not been acquired"));
 488                 return_ACPI_STATUS(AE_NOT_ACQUIRED);
 489         }
 490
 491         /* One fewer thread has the global lock */
 492
 493         acpi_gbl_global_lock_thread_count--;
 494         if (acpi_gbl_global_lock_thread_count) {
 495                 /* There are still some threads holding the lock, cannot release */
 496
 497                 return_ACPI_STATUS(AE_OK);
 498         }
 499
 500         /*
 501          * No more threads holding lock, we can do the actual hardware
 502          * release
 503          */
 504         ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_common_fACS.global_lock, pending);
 505         acpi_gbl_global_lock_acquired = FALSE;
 506
 507         /*
 508          * If the pending bit was set, we must write GBL_RLS to the control
 509          * register
 510          */
 511         if (pending) {
 512                 status = acpi_set_register(ACPI_BITREG_GLOBAL_LOCK_RELEASE,
 513                                            1, ACPI_MTX_LOCK);
 514         }
 515
 516         return_ACPI_STATUS(status);
 517 }
 518
 519 /******************************************************************************
 520  *
 521  * FUNCTION:    acpi_ev_terminate
 522  *
 523  * PARAMETERS:  none
 524  *
 525  * RETURN:      none
 526  *
 527  * DESCRIPTION: Disable events and free memory allocated for table storage.
 528  *
 529  ******************************************************************************/
 530
 531 void acpi_ev_terminate(void)
 532 {
 533         acpi_native_uint i;
 534         acpi_status status;
 535
 536         ACPI_FUNCTION_TRACE("ev_terminate");
 537
 538         if (acpi_gbl_events_initialized) {
 539                 /*
 540                  * Disable all event-related functionality.
 541                  * In all cases, on error, print a message but obviously we don't abort.
 542                  */
 543
 544                 /* Disable all fixed events */
 545
 546                 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 547                         status = acpi_disable_event((u32) i, 0);
 548                         if (ACPI_FAILURE(status)) {
 549                                 ACPI_ERROR((AE_INFO,
 550                                             "Could not disable fixed event %d",
 551                                             (u32) i));
 552                         }
 553                 }
 554
 555                 /* Disable all GPEs in all GPE blocks */
 556
 557                 status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block);
 558
 559                 /* Remove SCI handler */
 560
 561                 status = acpi_ev_remove_sci_handler();
 562                 if (ACPI_FAILURE(status)) {
 563                         ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
 564                 }
 565         }
 566
 567         /* Deallocate all handler objects installed within GPE info structs */
 568
 569         status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers);
 570
 571         /* Return to original mode if necessary */
 572
 573         if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
 574                 status = acpi_disable();
 575                 if (ACPI_FAILURE(status)) {
 576                         ACPI_WARNING((AE_INFO, "acpi_disable failed"));
 577                 }
 578         }
 579         return_VOID;
 580 }