release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/evmisc.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evmisc - Miscellaneous event manager support functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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. Attempt to acquire the global lock,
 288  *              if successful, signal the thread waiting for the lock.
 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
 296 static u32 acpi_ev_global_lock_handler(void *context)
 297 {
 298         u8 acquired = FALSE;
 299
 300         /*
 301          * Attempt to get the lock.
 302          *
 303          * If we don't get it now, it will be marked pending and we will
 304          * take another interrupt when it becomes free.
 305          */
 306         ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
 307         if (acquired) {
 308
 309                 /* Got the lock, now wake all threads waiting for it */
 310
 311                 acpi_gbl_global_lock_acquired = TRUE;
 312                 /* Send a unit to the semaphore */
 313
 314                 if (ACPI_FAILURE
 315                     (acpi_os_signal_semaphore
 316                      (acpi_gbl_global_lock_semaphore, 1))) {
 317                         ACPI_ERROR((AE_INFO,
 318                                     "Could not signal Global Lock semaphore"));
 319                 }
 320         }
 321
 322         return (ACPI_INTERRUPT_HANDLED);
 323 }
 324
 325 /*******************************************************************************
 326  *
 327  * FUNCTION:    acpi_ev_init_global_lock_handler
 328  *
 329  * PARAMETERS:  None
 330  *
 331  * RETURN:      Status
 332  *
 333  * DESCRIPTION: Install a handler for the global lock release event
 334  *
 335  ******************************************************************************/
 336
 337 acpi_status acpi_ev_init_global_lock_handler(void)
 338 {
 339         acpi_status status;
 340
 341         ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
 342
 343         /* Attempt installation of the global lock handler */
 344
 345         status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
 346                                                   acpi_ev_global_lock_handler,
 347                                                   NULL);
 348
 349         /*
 350          * If the global lock does not exist on this platform, the attempt to
 351          * enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick).
 352          * Map to AE_OK, but mark global lock as not present. Any attempt to
 353          * actually use the global lock will be flagged with an error.
 354          */
 355         if (status == AE_NO_HARDWARE_RESPONSE) {
 356                 ACPI_ERROR((AE_INFO,
 357                             "No response from Global Lock hardware, disabling lock"));
 358
 359                 acpi_gbl_global_lock_present = FALSE;
 360                 return_ACPI_STATUS(AE_OK);
 361         }
 362
 363         acpi_gbl_global_lock_present = TRUE;
 364         return_ACPI_STATUS(status);
 365 }
 366
 367 /*******************************************************************************
 368  *
 369  * FUNCTION:    acpi_ev_remove_global_lock_handler
 370  *
 371  * PARAMETERS:  None
 372  *
 373  * RETURN:      Status
 374  *
 375  * DESCRIPTION: Remove the handler for the Global Lock
 376  *
 377  ******************************************************************************/
 378
 379 static acpi_status acpi_ev_remove_global_lock_handler(void)
 380 {
 381         acpi_status status;
 382
 383         ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler);
 384
 385         acpi_gbl_global_lock_present = FALSE;
 386         status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL,
 387                                                  acpi_ev_global_lock_handler);
 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  * MUTEX:       Interpreter must be locked
 403  *
 404  * Note: The original implementation allowed multiple threads to "acquire" the
 405  * Global Lock, and the OS would hold the lock until the last thread had
 406  * released it. However, this could potentially starve the BIOS out of the
 407  * lock, especially in the case where there is a tight handshake between the
 408  * Embedded Controller driver and the BIOS. Therefore, this implementation
 409  * allows only one thread to acquire the HW Global Lock at a time, and makes
 410  * the global lock appear as a standard mutex on the OS side.
 411  *
 412  *****************************************************************************/
 413 static acpi_thread_id acpi_ev_global_lock_thread_id;
 414 static int acpi_ev_global_lock_acquired;
 415
 416 acpi_status acpi_ev_acquire_global_lock(u16 timeout)
 417 {
 418         acpi_status status = AE_OK;
 419         u8 acquired = FALSE;
 420
 421         ACPI_FUNCTION_TRACE(ev_acquire_global_lock);
 422
 423         /*
 424          * Only one thread can acquire the GL at a time, the global_lock_mutex
 425          * enforces this. This interface releases the interpreter if we must wait.
 426          */
 427         status = acpi_ex_system_wait_mutex(
 428                         acpi_gbl_global_lock_mutex->mutex.os_mutex, 0);
 429         if (status == AE_TIME) {
 430                 if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) {
 431                         acpi_ev_global_lock_acquired++;
 432                         return AE_OK;
 433                 }
 434         }
 435
 436         if (ACPI_FAILURE(status)) {
 437                 status = acpi_ex_system_wait_mutex(
 438                                 acpi_gbl_global_lock_mutex->mutex.os_mutex,
 439                                 timeout);
 440         }
 441         if (ACPI_FAILURE(status)) {
 442                 return_ACPI_STATUS(status);
 443         }
 444
 445         acpi_ev_global_lock_thread_id = acpi_os_get_thread_id();
 446         acpi_ev_global_lock_acquired++;
 447
 448         /*
 449          * Update the global lock handle and check for wraparound. The handle is
 450          * only used for the external global lock interfaces, but it is updated
 451          * here to properly handle the case where a single thread may acquire the
 452          * lock via both the AML and the acpi_acquire_global_lock interfaces. The
 453          * handle is therefore updated on the first acquire from a given thread
 454          * regardless of where the acquisition request originated.
 455          */
 456         acpi_gbl_global_lock_handle++;
 457         if (acpi_gbl_global_lock_handle == 0) {
 458                 acpi_gbl_global_lock_handle = 1;
 459         }
 460
 461         /*
 462          * Make sure that a global lock actually exists. If not, just treat the
 463          * lock as a standard mutex.
 464          */
 465         if (!acpi_gbl_global_lock_present) {
 466                 acpi_gbl_global_lock_acquired = TRUE;
 467                 return_ACPI_STATUS(AE_OK);
 468         }
 469
 470         /* Attempt to acquire the actual hardware lock */
 471
 472         ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
 473         if (acquired) {
 474
 475                 /* We got the lock */
 476
 477                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 478                                   "Acquired hardware Global Lock\n"));
 479
 480                 acpi_gbl_global_lock_acquired = TRUE;
 481                 return_ACPI_STATUS(AE_OK);
 482         }
 483
 484         /*
 485          * Did not get the lock. The pending bit was set above, and we must now
 486          * wait until we get the global lock released interrupt.
 487          */
 488         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Waiting for hardware Global Lock\n"));
 489
 490         /*
 491          * Wait for handshake with the global lock interrupt handler.
 492          * This interface releases the interpreter if we must wait.
 493          */
 494         status = acpi_ex_system_wait_semaphore(acpi_gbl_global_lock_semaphore,
 495                                                ACPI_WAIT_FOREVER);
 496
 497         return_ACPI_STATUS(status);
 498 }
 499
 500 /*******************************************************************************
 501  *
 502  * FUNCTION:    acpi_ev_release_global_lock
 503  *
 504  * PARAMETERS:  None
 505  *
 506  * RETURN:      Status
 507  *
 508  * DESCRIPTION: Releases ownership of the Global Lock.
 509  *
 510  ******************************************************************************/
 511
 512 acpi_status acpi_ev_release_global_lock(void)
 513 {
 514         u8 pending = FALSE;
 515         acpi_status status = AE_OK;
 516
 517         ACPI_FUNCTION_TRACE(ev_release_global_lock);
 518
 519         /* Lock must be already acquired */
 520
 521         if (!acpi_gbl_global_lock_acquired) {
 522                 ACPI_WARNING((AE_INFO,
 523                               "Cannot release the ACPI Global Lock, it has not been acquired"));
 524                 return_ACPI_STATUS(AE_NOT_ACQUIRED);
 525         }
 526
 527         acpi_ev_global_lock_acquired--;
 528         if (acpi_ev_global_lock_acquired > 0) {
 529                 return AE_OK;
 530         }
 531
 532         if (acpi_gbl_global_lock_present) {
 533
 534                 /* Allow any thread to release the lock */
 535
 536                 ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_FACS, pending);
 537
 538                 /*
 539                  * If the pending bit was set, we must write GBL_RLS to the control
 540                  * register
 541                  */
 542                 if (pending) {
 543                         status =
 544                             acpi_write_bit_register
 545                             (ACPI_BITREG_GLOBAL_LOCK_RELEASE,
 546                              ACPI_ENABLE_EVENT);
 547                 }
 548
 549                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 550                                   "Released hardware Global Lock\n"));
 551         }
 552
 553         acpi_gbl_global_lock_acquired = FALSE;
 554
 555         /* Release the local GL mutex */
 556         acpi_ev_global_lock_thread_id = NULL;
 557         acpi_ev_global_lock_acquired = 0;
 558         acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex);
 559         return_ACPI_STATUS(status);
 560 }
 561
 562 /******************************************************************************
 563  *
 564  * FUNCTION:    acpi_ev_terminate
 565  *
 566  * PARAMETERS:  none
 567  *
 568  * RETURN:      none
 569  *
 570  * DESCRIPTION: Disable events and free memory allocated for table storage.
 571  *
 572  ******************************************************************************/
 573
 574 void acpi_ev_terminate(void)
 575 {
 576         u32 i;
 577         acpi_status status;
 578
 579         ACPI_FUNCTION_TRACE(ev_terminate);
 580
 581         if (acpi_gbl_events_initialized) {
 582                 /*
 583                  * Disable all event-related functionality. In all cases, on error,
 584                  * print a message but obviously we don't abort.
 585                  */
 586
 587                 /* Disable all fixed events */
 588
 589                 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 590                         status = acpi_disable_event(i, 0);
 591                         if (ACPI_FAILURE(status)) {
 592                                 ACPI_ERROR((AE_INFO,
 593                                             "Could not disable fixed event %u",
 594                                             (u32) i));
 595                         }
 596                 }
 597
 598                 /* Disable all GPEs in all GPE blocks */
 599
 600                 status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
 601
 602                 /* Remove SCI handler */
 603
 604                 status = acpi_ev_remove_sci_handler();
 605                 if (ACPI_FAILURE(status)) {
 606                         ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
 607                 }
 608
 609                 status = acpi_ev_remove_global_lock_handler();
 610                 if (ACPI_FAILURE(status)) {
 611                         ACPI_ERROR((AE_INFO,
 612                                     "Could not remove Global Lock handler"));
 613                 }
 614         }
 615
 616         /* Deallocate all handler objects installed within GPE info structs */
 617
 618         status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL);
 619
 620         /* Return to original mode if necessary */
 621
 622         if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
 623                 status = acpi_disable();
 624                 if (ACPI_FAILURE(status)) {
 625                         ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
 626                 }
 627         }
 628         return_VOID;
 629 }