drivers/acpi/acpica/evmisc.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evmisc - Miscellaneous event manager support functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2011, 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 #include "acevents.h"
  47 #include "acnamesp.h"
  48 #include "acinterp.h"
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51 ACPI_MODULE_NAME("evmisc")
  52
  53 /* Local prototypes */
  54 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
  55
  56 static u32 acpi_ev_global_lock_handler(void *context);
  57
  58 static acpi_status acpi_ev_remove_global_lock_handler(void);
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ev_is_notify_object
  63  *
  64  * PARAMETERS:  Node            - Node to check
  65  *
  66  * RETURN:      TRUE if notifies allowed on this object
  67  *
  68  * DESCRIPTION: Check type of node for a object that supports notifies.
  69  *
  70  *              TBD: This could be replaced by a flag bit in the node.
  71  *
  72  ******************************************************************************/
  73
  74 u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
  75 {
  76         switch (node->type) {
  77         case ACPI_TYPE_DEVICE:
  78         case ACPI_TYPE_PROCESSOR:
  79         case ACPI_TYPE_THERMAL:
  80                 /*
  81                  * These are the ONLY objects that can receive ACPI notifications
  82                  */
  83                 return (TRUE);
  84
  85         default:
  86                 return (FALSE);
  87         }
  88 }
  89
  90 /*******************************************************************************
  91  *
  92  * FUNCTION:    acpi_ev_queue_notify_request
  93  *
  94  * PARAMETERS:  Node            - NS node for the notified object
  95  *              notify_value    - Value from the Notify() request
  96  *
  97  * RETURN:      Status
  98  *
  99  * DESCRIPTION: Dispatch a device notification event to a previously
 100  *              installed handler.
 101  *
 102  ******************************************************************************/
 103
 104 acpi_status
 105 acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
 106                              u32 notify_value)
 107 {
 108         union acpi_operand_object *obj_desc;
 109         union acpi_operand_object *handler_obj = NULL;
 110         union acpi_generic_state *notify_info;
 111         acpi_status status = AE_OK;
 112
 113         ACPI_FUNCTION_NAME(ev_queue_notify_request);
 114
 115         /*
 116          * For value 3 (Ejection Request), some device method may need to be run.
 117          * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need
 118          *   to be run.
 119          * For value 0x80 (Status Change) on the power button or sleep button,
 120          *   initiate soft-off or sleep operation?
 121          */
 122         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 123                           "Dispatching Notify on [%4.4s] Node %p Value 0x%2.2X (%s)\n",
 124                           acpi_ut_get_node_name(node), node, notify_value,
 125                           acpi_ut_get_notify_name(notify_value)));
 126
 127         /* Get the notify object attached to the NS Node */
 128
 129         obj_desc = acpi_ns_get_attached_object(node);
 130         if (obj_desc) {
 131
 132                 /* We have the notify object, Get the right handler */
 133
 134                 switch (node->type) {
 135
 136                         /* Notify allowed only on these types */
 137
 138                 case ACPI_TYPE_DEVICE:
 139                 case ACPI_TYPE_THERMAL:
 140                 case ACPI_TYPE_PROCESSOR:
 141
 142                         if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
 143                                 handler_obj =
 144                                     obj_desc->common_notify.system_notify;
 145                         } else {
 146                                 handler_obj =
 147                                     obj_desc->common_notify.device_notify;
 148                         }
 149                         break;
 150
 151                 default:
 152
 153                         /* All other types are not supported */
 154
 155                         return (AE_TYPE);
 156                 }
 157         }
 158
 159         /*
 160          * If there is any handler to run, schedule the dispatcher.
 161          * Check for:
 162          * 1) Global system notify handler
 163          * 2) Global device notify handler
 164          * 3) Per-device notify handler
 165          */
 166         if ((acpi_gbl_system_notify.handler &&
 167              (notify_value <= ACPI_MAX_SYS_NOTIFY)) ||
 168             (acpi_gbl_device_notify.handler &&
 169              (notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) {
 170                 notify_info = acpi_ut_create_generic_state();
 171                 if (!notify_info) {
 172                         return (AE_NO_MEMORY);
 173                 }
 174
 175                 if (!handler_obj) {
 176                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 177                                           "Executing system notify handler for Notify (%4.4s, %X) "
 178                                           "node %p\n",
 179                                           acpi_ut_get_node_name(node),
 180                                           notify_value, node));
 181                 }
 182
 183                 notify_info->common.descriptor_type =
 184                     ACPI_DESC_TYPE_STATE_NOTIFY;
 185                 notify_info->notify.node = node;
 186                 notify_info->notify.value = (u16) notify_value;
 187                 notify_info->notify.handler_obj = handler_obj;
 188
 189                 status =
 190                     acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch,
 191                                     notify_info);
 192                 if (ACPI_FAILURE(status)) {
 193                         acpi_ut_delete_generic_state(notify_info);
 194                 }
 195         } else {
 196                 /* There is no notify handler (per-device or system) for this device */
 197
 198                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 199                                   "No notify handler for Notify (%4.4s, %X) node %p\n",
 200                                   acpi_ut_get_node_name(node), notify_value,
 201                                   node));
 202         }
 203
 204         return (status);
 205 }
 206
 207 /*******************************************************************************
 208  *
 209  * FUNCTION:    acpi_ev_notify_dispatch
 210  *
 211  * PARAMETERS:  Context         - To be passed to the notify handler
 212  *
 213  * RETURN:      None.
 214  *
 215  * DESCRIPTION: Dispatch a device notification event to a previously
 216  *              installed handler.
 217  *
 218  ******************************************************************************/
 219
 220 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
 221 {
 222         union acpi_generic_state *notify_info =
 223             (union acpi_generic_state *)context;
 224         acpi_notify_handler global_handler = NULL;
 225         void *global_context = NULL;
 226         union acpi_operand_object *handler_obj;
 227
 228         ACPI_FUNCTION_ENTRY();
 229
 230         /*
 231          * We will invoke a global notify handler if installed. This is done
 232          * _before_ we invoke the per-device handler attached to the device.
 233          */
 234         if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
 235
 236                 /* Global system notification handler */
 237
 238                 if (acpi_gbl_system_notify.handler) {
 239                         global_handler = acpi_gbl_system_notify.handler;
 240                         global_context = acpi_gbl_system_notify.context;
 241                 }
 242         } else {
 243                 /* Global driver notification handler */
 244
 245                 if (acpi_gbl_device_notify.handler) {
 246                         global_handler = acpi_gbl_device_notify.handler;
 247                         global_context = acpi_gbl_device_notify.context;
 248                 }
 249         }
 250
 251         /* Invoke the system handler first, if present */
 252
 253         if (global_handler) {
 254                 global_handler(notify_info->notify.node,
 255                                notify_info->notify.value, global_context);
 256         }
 257
 258         /* Now invoke the per-device handler, if present */
 259
 260         handler_obj = notify_info->notify.handler_obj;
 261         if (handler_obj) {
 262                 struct acpi_object_notify_handler *notifier;
 263
 264                 notifier = &handler_obj->notify;
 265                 while (notifier) {
 266                         notifier->handler(notify_info->notify.node,
 267                                           notify_info->notify.value,
 268                                           notifier->context);
 269                         notifier = notifier->next;
 270                 }
 271         }
 272
 273         /* All done with the info object */
 274
 275         acpi_ut_delete_generic_state(notify_info);
 276 }
 277
 278 /*******************************************************************************
 279  *
 280  * FUNCTION:    acpi_ev_global_lock_handler
 281  *
 282  * PARAMETERS:  Context         - From thread interface, not used
 283  *
 284  * RETURN:      ACPI_INTERRUPT_HANDLED
 285  *
 286  * DESCRIPTION: Invoked directly from the SCI handler when a global lock
 287  *              release interrupt occurs.  If there's a thread waiting for
 288  *              the global lock, signal it.
 289  *
 290  * NOTE: Assumes that the semaphore can be signaled from interrupt level. If
 291  * this is not possible for some reason, a separate thread will have to be
 292  * scheduled to do this.
 293  *
 294  ******************************************************************************/
 295 static u8 acpi_ev_global_lock_pending;
 296
 297 static u32 acpi_ev_global_lock_handler(void *context)
 298 {
 299         acpi_status status;
 300         acpi_cpu_flags flags;
 301
 302         flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock);
 303
 304         if (!acpi_ev_global_lock_pending) {
 305                 goto out;
 306         }
 307
 308         /* Send a unit to the semaphore */
 309
 310         status = acpi_os_signal_semaphore(acpi_gbl_global_lock_semaphore, 1);
 311         if (ACPI_FAILURE(status)) {
 312                 ACPI_ERROR((AE_INFO, "Could not signal Global Lock semaphore"));
 313         }
 314
 315         acpi_ev_global_lock_pending = FALSE;
 316
 317  out:
 318         acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags);
 319
 320         return (ACPI_INTERRUPT_HANDLED);
 321 }
 322
 323 /*******************************************************************************
 324  *
 325  * FUNCTION:    acpi_ev_init_global_lock_handler
 326  *
 327  * PARAMETERS:  None
 328  *
 329  * RETURN:      Status
 330  *
 331  * DESCRIPTION: Install a handler for the global lock release event
 332  *
 333  ******************************************************************************/
 334
 335 acpi_status acpi_ev_init_global_lock_handler(void)
 336 {
 337         acpi_status status;
 338
 339         ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
 340
 341         /* Attempt installation of the global lock handler */
 342
 343         status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
 344                                                   acpi_ev_global_lock_handler,
 345                                                   NULL);
 346
 347         /*
 348          * If the global lock does not exist on this platform, the attempt to
 349          * enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick).
 350          * Map to AE_OK, but mark global lock as not present. Any attempt to
 351          * actually use the global lock will be flagged with an error.
 352          */
 353         if (status == AE_NO_HARDWARE_RESPONSE) {
 354                 ACPI_ERROR((AE_INFO,
 355                             "No response from Global Lock hardware, disabling lock"));
 356
 357                 acpi_gbl_global_lock_present = FALSE;
 358                 return_ACPI_STATUS(AE_OK);
 359         }
 360
 361         acpi_gbl_global_lock_present = TRUE;
 362         return_ACPI_STATUS(status);
 363 }
 364
 365 /*******************************************************************************
 366  *
 367  * FUNCTION:    acpi_ev_remove_global_lock_handler
 368  *
 369  * PARAMETERS:  None
 370  *
 371  * RETURN:      Status
 372  *
 373  * DESCRIPTION: Remove the handler for the Global Lock
 374  *
 375  ******************************************************************************/
 376
 377 static acpi_status acpi_ev_remove_global_lock_handler(void)
 378 {
 379         acpi_status status;
 380
 381         ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler);
 382
 383         acpi_gbl_global_lock_present = FALSE;
 384         status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL,
 385                                                  acpi_ev_global_lock_handler);
 386
 387         return_ACPI_STATUS(status);
 388 }
 389
 390 /******************************************************************************
 391  *
 392  * FUNCTION:    acpi_ev_acquire_global_lock
 393  *
 394  * PARAMETERS:  Timeout         - Max time to wait for the lock, in millisec.
 395  *
 396  * RETURN:      Status
 397  *
 398  * DESCRIPTION: Attempt to gain ownership of the Global Lock.
 399  *
 400  * MUTEX:       Interpreter must be locked
 401  *
 402  * Note: The original implementation allowed multiple threads to "acquire" the
 403  * Global Lock, and the OS would hold the lock until the last thread had
 404  * released it. However, this could potentially starve the BIOS out of the
 405  * lock, especially in the case where there is a tight handshake between the
 406  * Embedded Controller driver and the BIOS. Therefore, this implementation
 407  * allows only one thread to acquire the HW Global Lock at a time, and makes
 408  * the global lock appear as a standard mutex on the OS side.
 409  *
 410  *****************************************************************************/
 411 static acpi_thread_id acpi_ev_global_lock_thread_id;
 412 static int acpi_ev_global_lock_acquired;
 413
 414 acpi_status acpi_ev_acquire_global_lock(u16 timeout)
 415 {
 416         acpi_cpu_flags flags;
 417         acpi_status status = AE_OK;
 418         u8 acquired = FALSE;
 419
 420         ACPI_FUNCTION_TRACE(ev_acquire_global_lock);
 421
 422         /*
 423          * Only one thread can acquire the GL at a time, the global_lock_mutex
 424          * enforces this. This interface releases the interpreter if we must wait.
 425          */
 426         status = acpi_ex_system_wait_mutex(
 427                         acpi_gbl_global_lock_mutex->mutex.os_mutex, 0);
 428         if (status == AE_TIME) {
 429                 if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) {
 430                         acpi_ev_global_lock_acquired++;
 431                         return AE_OK;
 432                 }
 433         }
 434
 435         if (ACPI_FAILURE(status)) {
 436                 status = acpi_ex_system_wait_mutex(
 437                                 acpi_gbl_global_lock_mutex->mutex.os_mutex,
 438                                 timeout);
 439         }
 440         if (ACPI_FAILURE(status)) {
 441                 return_ACPI_STATUS(status);
 442         }
 443
 444         acpi_ev_global_lock_thread_id = acpi_os_get_thread_id();
 445         acpi_ev_global_lock_acquired++;
 446
 447         /*
 448          * Update the global lock handle and check for wraparound. The handle is
 449          * only used for the external global lock interfaces, but it is updated
 450          * here to properly handle the case where a single thread may acquire the
 451          * lock via both the AML and the acpi_acquire_global_lock interfaces. The
 452          * handle is therefore updated on the first acquire from a given thread
 453          * regardless of where the acquisition request originated.
 454          */
 455         acpi_gbl_global_lock_handle++;
 456         if (acpi_gbl_global_lock_handle == 0) {
 457                 acpi_gbl_global_lock_handle = 1;
 458         }
 459
 460         /*
 461          * Make sure that a global lock actually exists. If not, just treat the
 462          * lock as a standard mutex.
 463          */
 464         if (!acpi_gbl_global_lock_present) {
 465                 acpi_gbl_global_lock_acquired = TRUE;
 466                 return_ACPI_STATUS(AE_OK);
 467         }
 468
 469         flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock);
 470
 471         do {
 472
 473                 /* Attempt to acquire the actual hardware lock */
 474
 475                 ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
 476                 if (acquired) {
 477                         acpi_gbl_global_lock_acquired = TRUE;
 478
 479                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 480                                           "Acquired hardware Global Lock\n"));
 481                         break;
 482                 }
 483
 484                 acpi_ev_global_lock_pending = TRUE;
 485
 486                 acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags);
 487
 488                 /*
 489                  * Did not get the lock. The pending bit was set above, and we
 490                  * must wait until we get the global lock released interrupt.
 491                  */
 492                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 493                                   "Waiting for hardware Global Lock\n"));
 494
 495                 /*
 496                  * Wait for handshake with the global lock interrupt handler.
 497                  * This interface releases the interpreter if we must wait.
 498                  */
 499                 status = acpi_ex_system_wait_semaphore(
 500                                                 acpi_gbl_global_lock_semaphore,
 501                                                 ACPI_WAIT_FOREVER);
 502
 503                 flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock);
 504
 505         } while (ACPI_SUCCESS(status));
 506
 507         acpi_ev_global_lock_pending = FALSE;
 508
 509         acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags);
 510
 511         return_ACPI_STATUS(status);
 512 }
 513
 514 /*******************************************************************************
 515  *
 516  * FUNCTION:    acpi_ev_release_global_lock
 517  *
 518  * PARAMETERS:  None
 519  *
 520  * RETURN:      Status
 521  *
 522  * DESCRIPTION: Releases ownership of the Global Lock.
 523  *
 524  ******************************************************************************/
 525
 526 acpi_status acpi_ev_release_global_lock(void)
 527 {
 528         u8 pending = FALSE;
 529         acpi_status status = AE_OK;
 530
 531         ACPI_FUNCTION_TRACE(ev_release_global_lock);
 532
 533         /* Lock must be already acquired */
 534
 535         if (!acpi_gbl_global_lock_acquired) {
 536                 ACPI_WARNING((AE_INFO,
 537                               "Cannot release the ACPI Global Lock, it has not been acquired"));
 538                 return_ACPI_STATUS(AE_NOT_ACQUIRED);
 539         }
 540
 541         acpi_ev_global_lock_acquired--;
 542         if (acpi_ev_global_lock_acquired > 0) {
 543                 return AE_OK;
 544         }
 545
 546         if (acpi_gbl_global_lock_present) {
 547
 548                 /* Allow any thread to release the lock */
 549
 550                 ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_FACS, pending);
 551
 552                 /*
 553                  * If the pending bit was set, we must write GBL_RLS to the control
 554                  * register
 555                  */
 556                 if (pending) {
 557                         status =
 558                             acpi_write_bit_register
 559                             (ACPI_BITREG_GLOBAL_LOCK_RELEASE,
 560                              ACPI_ENABLE_EVENT);
 561                 }
 562
 563                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 564                                   "Released hardware Global Lock\n"));
 565         }
 566
 567         acpi_gbl_global_lock_acquired = FALSE;
 568
 569         /* Release the local GL mutex */
 570         acpi_ev_global_lock_thread_id = 0;
 571         acpi_ev_global_lock_acquired = 0;
 572         acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex);
 573         return_ACPI_STATUS(status);
 574 }
 575
 576 /******************************************************************************
 577  *
 578  * FUNCTION:    acpi_ev_terminate
 579  *
 580  * PARAMETERS:  none
 581  *
 582  * RETURN:      none
 583  *
 584  * DESCRIPTION: Disable events and free memory allocated for table storage.
 585  *
 586  ******************************************************************************/
 587
 588 void acpi_ev_terminate(void)
 589 {
 590         u32 i;
 591         acpi_status status;
 592
 593         ACPI_FUNCTION_TRACE(ev_terminate);
 594
 595         if (acpi_gbl_events_initialized) {
 596                 /*
 597                  * Disable all event-related functionality. In all cases, on error,
 598                  * print a message but obviously we don't abort.
 599                  */
 600
 601                 /* Disable all fixed events */
 602
 603                 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 604                         status = acpi_disable_event(i, 0);
 605                         if (ACPI_FAILURE(status)) {
 606                                 ACPI_ERROR((AE_INFO,
 607                                             "Could not disable fixed event %u",
 608                                             (u32) i));
 609                         }
 610                 }
 611
 612                 /* Disable all GPEs in all GPE blocks */
 613
 614                 status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
 615
 616                 /* Remove SCI handler */
 617
 618                 status = acpi_ev_remove_sci_handler();
 619                 if (ACPI_FAILURE(status)) {
 620                         ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
 621                 }
 622
 623                 status = acpi_ev_remove_global_lock_handler();
 624                 if (ACPI_FAILURE(status)) {
 625                         ACPI_ERROR((AE_INFO,
 626                                     "Could not remove Global Lock handler"));
 627                 }
 628         }
 629
 630         /* Deallocate all handler objects installed within GPE info structs */
 631
 632         status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL);
 633
 634         /* Return to original mode if necessary */
 635
 636         if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
 637                 status = acpi_disable();
 638                 if (ACPI_FAILURE(status)) {
 639                         ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
 640                 }
 641         }
 642         return_VOID;
 643 }