git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/acpica/evgpeblk.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeblk - GPE block creation and initialization.
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, 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
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evgpeblk")
  51
  52 /* Local prototypes */
  53 static acpi_status
  54 acpi_ev_save_method_info(acpi_handle obj_handle,
  55                          u32 level, void *obj_desc, void **return_value);
  56
  57 static acpi_status
  58 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
  59                           u32 level, void *info, void **return_value);
  60
  61 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
  62                                                                interrupt_number);
  63
  64 static acpi_status
  65 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt);
  66
  67 static acpi_status
  68 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
  69                           u32 interrupt_number);
  70
  71 static acpi_status
  72 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block);
  73
  74 /*******************************************************************************
  75  *
  76  * FUNCTION:    acpi_ev_valid_gpe_event
  77  *
  78  * PARAMETERS:  gpe_event_info              - Info for this GPE
  79  *
  80  * RETURN:      TRUE if the gpe_event is valid
  81  *
  82  * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
  83  *              Should be called only when the GPE lists are semaphore locked
  84  *              and not subject to change.
  85  *
  86  ******************************************************************************/
  87
  88 u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
  89 {
  90         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
  91         struct acpi_gpe_block_info *gpe_block;
  92
  93         ACPI_FUNCTION_ENTRY();
  94
  95         /* No need for spin lock since we are not changing any list elements */
  96
  97         /* Walk the GPE interrupt levels */
  98
  99         gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
 100         while (gpe_xrupt_block) {
 101                 gpe_block = gpe_xrupt_block->gpe_block_list_head;
 102
 103                 /* Walk the GPE blocks on this interrupt level */
 104
 105                 while (gpe_block) {
 106                         if ((&gpe_block->event_info[0] <= gpe_event_info) &&
 107                             (&gpe_block->
 108                              event_info[((acpi_size) gpe_block->
 109                                          register_count) * 8] >
 110                              gpe_event_info)) {
 111                                 return (TRUE);
 112                         }
 113
 114                         gpe_block = gpe_block->next;
 115                 }
 116
 117                 gpe_xrupt_block = gpe_xrupt_block->next;
 118         }
 119
 120         return (FALSE);
 121 }
 122
 123 /*******************************************************************************
 124  *
 125  * FUNCTION:    acpi_ev_walk_gpe_list
 126  *
 127  * PARAMETERS:  gpe_walk_callback   - Routine called for each GPE block
 128  *              Context             - Value passed to callback
 129  *
 130  * RETURN:      Status
 131  *
 132  * DESCRIPTION: Walk the GPE lists.
 133  *
 134  ******************************************************************************/
 135
 136 acpi_status
 137 acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
 138 {
 139         struct acpi_gpe_block_info *gpe_block;
 140         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 141         acpi_status status = AE_OK;
 142         acpi_cpu_flags flags;
 143
 144         ACPI_FUNCTION_TRACE(ev_walk_gpe_list);
 145
 146         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 147
 148         /* Walk the interrupt level descriptor list */
 149
 150         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 151         while (gpe_xrupt_info) {
 152
 153                 /* Walk all Gpe Blocks attached to this interrupt level */
 154
 155                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 156                 while (gpe_block) {
 157
 158                         /* One callback per GPE block */
 159
 160                         status =
 161                             gpe_walk_callback(gpe_xrupt_info, gpe_block,
 162                                               context);
 163                         if (ACPI_FAILURE(status)) {
 164                                 if (status == AE_CTRL_END) {    /* Callback abort */
 165                                         status = AE_OK;
 166                                 }
 167                                 goto unlock_and_exit;
 168                         }
 169
 170                         gpe_block = gpe_block->next;
 171                 }
 172
 173                 gpe_xrupt_info = gpe_xrupt_info->next;
 174         }
 175
 176       unlock_and_exit:
 177         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 178         return_ACPI_STATUS(status);
 179 }
 180
 181 /*******************************************************************************
 182  *
 183  * FUNCTION:    acpi_ev_delete_gpe_handlers
 184  *
 185  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 186  *              gpe_block           - Gpe Block info
 187  *
 188  * RETURN:      Status
 189  *
 190  * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
 191  *              Used only prior to termination.
 192  *
 193  ******************************************************************************/
 194
 195 acpi_status
 196 acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 197                             struct acpi_gpe_block_info *gpe_block,
 198                             void *context)
 199 {
 200         struct acpi_gpe_event_info *gpe_event_info;
 201         u32 i;
 202         u32 j;
 203
 204         ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);
 205
 206         /* Examine each GPE Register within the block */
 207
 208         for (i = 0; i < gpe_block->register_count; i++) {
 209
 210                 /* Now look at the individual GPEs in this byte register */
 211
 212                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 213                         gpe_event_info =
 214                             &gpe_block->
 215                             event_info[((acpi_size) i *
 216                                         ACPI_GPE_REGISTER_WIDTH) + j];
 217
 218                         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 219                             ACPI_GPE_DISPATCH_HANDLER) {
 220                                 ACPI_FREE(gpe_event_info->dispatch.handler);
 221                                 gpe_event_info->dispatch.handler = NULL;
 222                                 gpe_event_info->flags &=
 223                                     ~ACPI_GPE_DISPATCH_MASK;
 224                         }
 225                 }
 226         }
 227
 228         return_ACPI_STATUS(AE_OK);
 229 }
 230
 231 /*******************************************************************************
 232  *
 233  * FUNCTION:    acpi_ev_save_method_info
 234  *
 235  * PARAMETERS:  Callback from walk_namespace
 236  *
 237  * RETURN:      Status
 238  *
 239  * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
 240  *              control method under the _GPE portion of the namespace.
 241  *              Extract the name and GPE type from the object, saving this
 242  *              information for quick lookup during GPE dispatch
 243  *
 244  *              The name of each GPE control method is of the form:
 245  *              "_Lxx" or "_Exx"
 246  *              Where:
 247  *                  L      - means that the GPE is level triggered
 248  *                  E      - means that the GPE is edge triggered
 249  *                  xx     - is the GPE number [in HEX]
 250  *
 251  ******************************************************************************/
 252
 253 static acpi_status
 254 acpi_ev_save_method_info(acpi_handle obj_handle,
 255                          u32 level, void *obj_desc, void **return_value)
 256 {
 257         struct acpi_gpe_block_info *gpe_block = (void *)obj_desc;
 258         struct acpi_gpe_event_info *gpe_event_info;
 259         u32 gpe_number;
 260         char name[ACPI_NAME_SIZE + 1];
 261         u8 type;
 262         acpi_status status;
 263
 264         ACPI_FUNCTION_TRACE(ev_save_method_info);
 265
 266         /*
 267          * _Lxx and _Exx GPE method support
 268          *
 269          * 1) Extract the name from the object and convert to a string
 270          */
 271         ACPI_MOVE_32_TO_32(name,
 272                            &((struct acpi_namespace_node *)obj_handle)->name.
 273                            integer);
 274         name[ACPI_NAME_SIZE] = 0;
 275
 276         /*
 277          * 2) Edge/Level determination is based on the 2nd character
 278          *    of the method name
 279          *
 280          * NOTE: Default GPE type is RUNTIME. May be changed later to WAKE
 281          * if a _PRW object is found that points to this GPE.
 282          */
 283         switch (name[1]) {
 284         case 'L':
 285                 type = ACPI_GPE_LEVEL_TRIGGERED;
 286                 break;
 287
 288         case 'E':
 289                 type = ACPI_GPE_EDGE_TRIGGERED;
 290                 break;
 291
 292         default:
 293                 /* Unknown method type, just ignore it! */
 294
 295                 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 296                                   "Ignoring unknown GPE method type: %s (name not of form _Lxx or _Exx)",
 297                                   name));
 298                 return_ACPI_STATUS(AE_OK);
 299         }
 300
 301         /* Convert the last two characters of the name to the GPE Number */
 302
 303         gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
 304         if (gpe_number == ACPI_UINT32_MAX) {
 305
 306                 /* Conversion failed; invalid method, just ignore it */
 307
 308                 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 309                                   "Could not extract GPE number from name: %s (name is not of form _Lxx or _Exx)",
 310                                   name));
 311                 return_ACPI_STATUS(AE_OK);
 312         }
 313
 314         /* Ensure that we have a valid GPE number for this GPE block */
 315
 316         if ((gpe_number < gpe_block->block_base_number) ||
 317             (gpe_number >=
 318              (gpe_block->block_base_number +
 319               (gpe_block->register_count * 8)))) {
 320                 /*
 321                  * Not valid for this GPE block, just ignore it. However, it may be
 322                  * valid for a different GPE block, since GPE0 and GPE1 methods both
 323                  * appear under \_GPE.
 324                  */
 325                 return_ACPI_STATUS(AE_OK);
 326         }
 327
 328         /*
 329          * Now we can add this information to the gpe_event_info block for use
 330          * during dispatch of this GPE. Default type is RUNTIME, although this may
 331          * change when the _PRW methods are executed later.
 332          */
 333         gpe_event_info =
 334             &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
 335
 336         gpe_event_info->flags = (u8)
 337             (type | ACPI_GPE_DISPATCH_METHOD | ACPI_GPE_TYPE_RUNTIME);
 338
 339         gpe_event_info->dispatch.method_node =
 340             (struct acpi_namespace_node *)obj_handle;
 341
 342         /* Update enable mask, but don't enable the HW GPE as of yet */
 343
 344         status = acpi_ev_enable_gpe(gpe_event_info, FALSE);
 345
 346         ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 347                           "Registered GPE method %s as GPE number 0x%.2X\n",
 348                           name, gpe_number));
 349         return_ACPI_STATUS(status);
 350 }
 351
 352 /*******************************************************************************
 353  *
 354  * FUNCTION:    acpi_ev_match_prw_and_gpe
 355  *
 356  * PARAMETERS:  Callback from walk_namespace
 357  *
 358  * RETURN:      Status. NOTE: We ignore errors so that the _PRW walk is
 359  *              not aborted on a single _PRW failure.
 360  *
 361  * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
 362  *              Device. Run the _PRW method. If present, extract the GPE
 363  *              number and mark the GPE as a WAKE GPE.
 364  *
 365  ******************************************************************************/
 366
 367 static acpi_status
 368 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
 369                           u32 level, void *info, void **return_value)
 370 {
 371         struct acpi_gpe_walk_info *gpe_info = (void *)info;
 372         struct acpi_namespace_node *gpe_device;
 373         struct acpi_gpe_block_info *gpe_block;
 374         struct acpi_namespace_node *target_gpe_device;
 375         struct acpi_gpe_event_info *gpe_event_info;
 376         union acpi_operand_object *pkg_desc;
 377         union acpi_operand_object *obj_desc;
 378         u32 gpe_number;
 379         acpi_status status;
 380
 381         ACPI_FUNCTION_TRACE(ev_match_prw_and_gpe);
 382
 383         /* Check for a _PRW method under this device */
 384
 385         status = acpi_ut_evaluate_object(obj_handle, METHOD_NAME__PRW,
 386                                          ACPI_BTYPE_PACKAGE, &pkg_desc);
 387         if (ACPI_FAILURE(status)) {
 388
 389                 /* Ignore all errors from _PRW, we don't want to abort the subsystem */
 390
 391                 return_ACPI_STATUS(AE_OK);
 392         }
 393
 394         /* The returned _PRW package must have at least two elements */
 395
 396         if (pkg_desc->package.count < 2) {
 397                 goto cleanup;
 398         }
 399
 400         /* Extract pointers from the input context */
 401
 402         gpe_device = gpe_info->gpe_device;
 403         gpe_block = gpe_info->gpe_block;
 404
 405         /*
 406          * The _PRW object must return a package, we are only interested in the
 407          * first element
 408          */
 409         obj_desc = pkg_desc->package.elements[0];
 410
 411         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 412
 413                 /* Use FADT-defined GPE device (from definition of _PRW) */
 414
 415                 target_gpe_device = acpi_gbl_fadt_gpe_device;
 416
 417                 /* Integer is the GPE number in the FADT described GPE blocks */
 418
 419                 gpe_number = (u32) obj_desc->integer.value;
 420         } else if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_PACKAGE) {
 421
 422                 /* Package contains a GPE reference and GPE number within a GPE block */
 423
 424                 if ((obj_desc->package.count < 2) ||
 425                     (ACPI_GET_OBJECT_TYPE(obj_desc->package.elements[0]) !=
 426                      ACPI_TYPE_LOCAL_REFERENCE)
 427                     || (ACPI_GET_OBJECT_TYPE(obj_desc->package.elements[1]) !=
 428                         ACPI_TYPE_INTEGER)) {
 429                         goto cleanup;
 430                 }
 431
 432                 /* Get GPE block reference and decode */
 433
 434                 target_gpe_device =
 435                     obj_desc->package.elements[0]->reference.node;
 436                 gpe_number = (u32) obj_desc->package.elements[1]->integer.value;
 437         } else {
 438                 /* Unknown type, just ignore it */
 439
 440                 goto cleanup;
 441         }
 442
 443         /*
 444          * Is this GPE within this block?
 445          *
 446          * TRUE if and only if these conditions are true:
 447          *     1) The GPE devices match.
 448          *     2) The GPE index(number) is within the range of the Gpe Block
 449          *          associated with the GPE device.
 450          */
 451         if ((gpe_device == target_gpe_device) &&
 452             (gpe_number >= gpe_block->block_base_number) &&
 453             (gpe_number <
 454              gpe_block->block_base_number + (gpe_block->register_count * 8))) {
 455                 gpe_event_info =
 456                     &gpe_block->event_info[gpe_number -
 457                                            gpe_block->block_base_number];
 458
 459                 /* Mark GPE for WAKE-ONLY but WAKE_DISABLED */
 460
 461                 gpe_event_info->flags &=
 462                     ~(ACPI_GPE_WAKE_ENABLED | ACPI_GPE_RUN_ENABLED);
 463
 464                 status =
 465                     acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
 466                 if (ACPI_FAILURE(status)) {
 467                         goto cleanup;
 468                 }
 469
 470                 status =
 471                     acpi_ev_update_gpe_enable_masks(gpe_event_info,
 472                                                     ACPI_GPE_DISABLE);
 473         }
 474
 475       cleanup:
 476         acpi_ut_remove_reference(pkg_desc);
 477         return_ACPI_STATUS(AE_OK);
 478 }
 479
 480 /*******************************************************************************
 481  *
 482  * FUNCTION:    acpi_ev_get_gpe_xrupt_block
 483  *
 484  * PARAMETERS:  interrupt_number     - Interrupt for a GPE block
 485  *
 486  * RETURN:      A GPE interrupt block
 487  *
 488  * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
 489  *              block per unique interrupt level used for GPEs. Should be
 490  *              called only when the GPE lists are semaphore locked and not
 491  *              subject to change.
 492  *
 493  ******************************************************************************/
 494
 495 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
 496                                                                interrupt_number)
 497 {
 498         struct acpi_gpe_xrupt_info *next_gpe_xrupt;
 499         struct acpi_gpe_xrupt_info *gpe_xrupt;
 500         acpi_status status;
 501         acpi_cpu_flags flags;
 502
 503         ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
 504
 505         /* No need for lock since we are not changing any list elements here */
 506
 507         next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 508         while (next_gpe_xrupt) {
 509                 if (next_gpe_xrupt->interrupt_number == interrupt_number) {
 510                         return_PTR(next_gpe_xrupt);
 511                 }
 512
 513                 next_gpe_xrupt = next_gpe_xrupt->next;
 514         }
 515
 516         /* Not found, must allocate a new xrupt descriptor */
 517
 518         gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
 519         if (!gpe_xrupt) {
 520                 return_PTR(NULL);
 521         }
 522
 523         gpe_xrupt->interrupt_number = interrupt_number;
 524
 525         /* Install new interrupt descriptor with spin lock */
 526
 527         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 528         if (acpi_gbl_gpe_xrupt_list_head) {
 529                 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 530                 while (next_gpe_xrupt->next) {
 531                         next_gpe_xrupt = next_gpe_xrupt->next;
 532                 }
 533
 534                 next_gpe_xrupt->next = gpe_xrupt;
 535                 gpe_xrupt->previous = next_gpe_xrupt;
 536         } else {
 537                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
 538         }
 539         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 540
 541         /* Install new interrupt handler if not SCI_INT */
 542
 543         if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
 544                 status = acpi_os_install_interrupt_handler(interrupt_number,
 545                                                            acpi_ev_gpe_xrupt_handler,
 546                                                            gpe_xrupt);
 547                 if (ACPI_FAILURE(status)) {
 548                         ACPI_ERROR((AE_INFO,
 549                                     "Could not install GPE interrupt handler at level 0x%X",
 550                                     interrupt_number));
 551                         return_PTR(NULL);
 552                 }
 553         }
 554
 555         return_PTR(gpe_xrupt);
 556 }
 557
 558 /*******************************************************************************
 559  *
 560  * FUNCTION:    acpi_ev_delete_gpe_xrupt
 561  *
 562  * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block
 563  *
 564  * RETURN:      Status
 565  *
 566  * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
 567  *              interrupt handler if not the SCI interrupt.
 568  *
 569  ******************************************************************************/
 570
 571 static acpi_status
 572 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
 573 {
 574         acpi_status status;
 575         acpi_cpu_flags flags;
 576
 577         ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
 578
 579         /* We never want to remove the SCI interrupt handler */
 580
 581         if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
 582                 gpe_xrupt->gpe_block_list_head = NULL;
 583                 return_ACPI_STATUS(AE_OK);
 584         }
 585
 586         /* Disable this interrupt */
 587
 588         status =
 589             acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
 590                                              acpi_ev_gpe_xrupt_handler);
 591         if (ACPI_FAILURE(status)) {
 592                 return_ACPI_STATUS(status);
 593         }
 594
 595         /* Unlink the interrupt block with lock */
 596
 597         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 598         if (gpe_xrupt->previous) {
 599                 gpe_xrupt->previous->next = gpe_xrupt->next;
 600         } else {
 601                 /* No previous, update list head */
 602
 603                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
 604         }
 605
 606         if (gpe_xrupt->next) {
 607                 gpe_xrupt->next->previous = gpe_xrupt->previous;
 608         }
 609         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 610
 611         /* Free the block */
 612
 613         ACPI_FREE(gpe_xrupt);
 614         return_ACPI_STATUS(AE_OK);
 615 }
 616
 617 /*******************************************************************************
 618  *
 619  * FUNCTION:    acpi_ev_install_gpe_block
 620  *
 621  * PARAMETERS:  gpe_block               - New GPE block
 622  *              interrupt_number        - Xrupt to be associated with this
 623  *                                        GPE block
 624  *
 625  * RETURN:      Status
 626  *
 627  * DESCRIPTION: Install new GPE block with mutex support
 628  *
 629  ******************************************************************************/
 630
 631 static acpi_status
 632 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
 633                           u32 interrupt_number)
 634 {
 635         struct acpi_gpe_block_info *next_gpe_block;
 636         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
 637         acpi_status status;
 638         acpi_cpu_flags flags;
 639
 640         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
 641
 642         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 643         if (ACPI_FAILURE(status)) {
 644                 return_ACPI_STATUS(status);
 645         }
 646
 647         gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block(interrupt_number);
 648         if (!gpe_xrupt_block) {
 649                 status = AE_NO_MEMORY;
 650                 goto unlock_and_exit;
 651         }
 652
 653         /* Install the new block at the end of the list with lock */
 654
 655         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 656         if (gpe_xrupt_block->gpe_block_list_head) {
 657                 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
 658                 while (next_gpe_block->next) {
 659                         next_gpe_block = next_gpe_block->next;
 660                 }
 661
 662                 next_gpe_block->next = gpe_block;
 663                 gpe_block->previous = next_gpe_block;
 664         } else {
 665                 gpe_xrupt_block->gpe_block_list_head = gpe_block;
 666         }
 667
 668         gpe_block->xrupt_block = gpe_xrupt_block;
 669         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 670
 671       unlock_and_exit:
 672         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 673         return_ACPI_STATUS(status);
 674 }
 675
 676 /*******************************************************************************
 677  *
 678  * FUNCTION:    acpi_ev_delete_gpe_block
 679  *
 680  * PARAMETERS:  gpe_block           - Existing GPE block
 681  *
 682  * RETURN:      Status
 683  *
 684  * DESCRIPTION: Remove a GPE block
 685  *
 686  ******************************************************************************/
 687
 688 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
 689 {
 690         acpi_status status;
 691         acpi_cpu_flags flags;
 692
 693         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
 694
 695         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 696         if (ACPI_FAILURE(status)) {
 697                 return_ACPI_STATUS(status);
 698         }
 699
 700         /* Disable all GPEs in this block */
 701
 702         status =
 703             acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block, NULL);
 704
 705         if (!gpe_block->previous && !gpe_block->next) {
 706
 707                 /* This is the last gpe_block on this interrupt */
 708
 709                 status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
 710                 if (ACPI_FAILURE(status)) {
 711                         goto unlock_and_exit;
 712                 }
 713         } else {
 714                 /* Remove the block on this interrupt with lock */
 715
 716                 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 717                 if (gpe_block->previous) {
 718                         gpe_block->previous->next = gpe_block->next;
 719                 } else {
 720                         gpe_block->xrupt_block->gpe_block_list_head =
 721                             gpe_block->next;
 722                 }
 723
 724                 if (gpe_block->next) {
 725                         gpe_block->next->previous = gpe_block->previous;
 726                 }
 727                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 728         }
 729
 730         acpi_current_gpe_count -=
 731             gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH;
 732
 733         /* Free the gpe_block */
 734
 735         ACPI_FREE(gpe_block->register_info);
 736         ACPI_FREE(gpe_block->event_info);
 737         ACPI_FREE(gpe_block);
 738
 739       unlock_and_exit:
 740         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 741         return_ACPI_STATUS(status);
 742 }
 743
 744 /*******************************************************************************
 745  *
 746  * FUNCTION:    acpi_ev_create_gpe_info_blocks
 747  *
 748  * PARAMETERS:  gpe_block   - New GPE block
 749  *
 750  * RETURN:      Status
 751  *
 752  * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
 753  *
 754  ******************************************************************************/
 755
 756 static acpi_status
 757 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
 758 {
 759         struct acpi_gpe_register_info *gpe_register_info = NULL;
 760         struct acpi_gpe_event_info *gpe_event_info = NULL;
 761         struct acpi_gpe_event_info *this_event;
 762         struct acpi_gpe_register_info *this_register;
 763         u32 i;
 764         u32 j;
 765         acpi_status status;
 766
 767         ACPI_FUNCTION_TRACE(ev_create_gpe_info_blocks);
 768
 769         /* Allocate the GPE register information block */
 770
 771         gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->
 772                                                  register_count *
 773                                                  sizeof(struct
 774                                                         acpi_gpe_register_info));
 775         if (!gpe_register_info) {
 776                 ACPI_ERROR((AE_INFO,
 777                             "Could not allocate the GpeRegisterInfo table"));
 778                 return_ACPI_STATUS(AE_NO_MEMORY);
 779         }
 780
 781         /*
 782          * Allocate the GPE event_info block. There are eight distinct GPEs
 783          * per register. Initialization to zeros is sufficient.
 784          */
 785         gpe_event_info = ACPI_ALLOCATE_ZEROED(((acpi_size) gpe_block->
 786                                                register_count *
 787                                                ACPI_GPE_REGISTER_WIDTH) *
 788                                               sizeof(struct
 789                                                      acpi_gpe_event_info));
 790         if (!gpe_event_info) {
 791                 ACPI_ERROR((AE_INFO,
 792                             "Could not allocate the GpeEventInfo table"));
 793                 status = AE_NO_MEMORY;
 794                 goto error_exit;
 795         }
 796
 797         /* Save the new Info arrays in the GPE block */
 798
 799         gpe_block->register_info = gpe_register_info;
 800         gpe_block->event_info = gpe_event_info;
 801
 802         /*
 803          * Initialize the GPE Register and Event structures. A goal of these
 804          * tables is to hide the fact that there are two separate GPE register
 805          * sets in a given GPE hardware block, the status registers occupy the
 806          * first half, and the enable registers occupy the second half.
 807          */
 808         this_register = gpe_register_info;
 809         this_event = gpe_event_info;
 810
 811         for (i = 0; i < gpe_block->register_count; i++) {
 812
 813                 /* Init the register_info for this GPE register (8 GPEs) */
 814
 815                 this_register->base_gpe_number =
 816                     (u8) (gpe_block->block_base_number +
 817                           (i * ACPI_GPE_REGISTER_WIDTH));
 818
 819                 this_register->status_address.address =
 820                     gpe_block->block_address.address + i;
 821
 822                 this_register->enable_address.address =
 823                     gpe_block->block_address.address + i +
 824                     gpe_block->register_count;
 825
 826                 this_register->status_address.space_id =
 827                     gpe_block->block_address.space_id;
 828                 this_register->enable_address.space_id =
 829                     gpe_block->block_address.space_id;
 830                 this_register->status_address.bit_width =
 831                     ACPI_GPE_REGISTER_WIDTH;
 832                 this_register->enable_address.bit_width =
 833                     ACPI_GPE_REGISTER_WIDTH;
 834                 this_register->status_address.bit_offset = 0;
 835                 this_register->enable_address.bit_offset = 0;
 836
 837                 /* Init the event_info for each GPE within this register */
 838
 839                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 840                         this_event->gpe_number =
 841                             (u8) (this_register->base_gpe_number + j);
 842                         this_event->register_info = this_register;
 843                         this_event++;
 844                 }
 845
 846                 /* Disable all GPEs within this register */
 847
 848                 status = acpi_write(0x00, &this_register->enable_address);
 849                 if (ACPI_FAILURE(status)) {
 850                         goto error_exit;
 851                 }
 852
 853                 /* Clear any pending GPE events within this register */
 854
 855                 status = acpi_write(0xFF, &this_register->status_address);
 856                 if (ACPI_FAILURE(status)) {
 857                         goto error_exit;
 858                 }
 859
 860                 this_register++;
 861         }
 862
 863         return_ACPI_STATUS(AE_OK);
 864
 865       error_exit:
 866         if (gpe_register_info) {
 867                 ACPI_FREE(gpe_register_info);
 868         }
 869         if (gpe_event_info) {
 870                 ACPI_FREE(gpe_event_info);
 871         }
 872
 873         return_ACPI_STATUS(status);
 874 }
 875
 876 /*******************************************************************************
 877  *
 878  * FUNCTION:    acpi_ev_create_gpe_block
 879  *
 880  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 881  *              gpe_block_address   - Address and space_iD
 882  *              register_count      - Number of GPE register pairs in the block
 883  *              gpe_block_base_number - Starting GPE number for the block
 884  *              interrupt_number    - H/W interrupt for the block
 885  *              return_gpe_block    - Where the new block descriptor is returned
 886  *
 887  * RETURN:      Status
 888  *
 889  * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
 890  *              the block are disabled at exit.
 891  *              Note: Assumes namespace is locked.
 892  *
 893  ******************************************************************************/
 894
 895 acpi_status
 896 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
 897                          struct acpi_generic_address *gpe_block_address,
 898                          u32 register_count,
 899                          u8 gpe_block_base_number,
 900                          u32 interrupt_number,
 901                          struct acpi_gpe_block_info **return_gpe_block)
 902 {
 903         acpi_status status;
 904         struct acpi_gpe_block_info *gpe_block;
 905
 906         ACPI_FUNCTION_TRACE(ev_create_gpe_block);
 907
 908         if (!register_count) {
 909                 return_ACPI_STATUS(AE_OK);
 910         }
 911
 912         /* Allocate a new GPE block */
 913
 914         gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
 915         if (!gpe_block) {
 916                 return_ACPI_STATUS(AE_NO_MEMORY);
 917         }
 918
 919         /* Initialize the new GPE block */
 920
 921         gpe_block->node = gpe_device;
 922         gpe_block->register_count = register_count;
 923         gpe_block->block_base_number = gpe_block_base_number;
 924
 925         ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
 926                     sizeof(struct acpi_generic_address));
 927
 928         /*
 929          * Create the register_info and event_info sub-structures
 930          * Note: disables and clears all GPEs in the block
 931          */
 932         status = acpi_ev_create_gpe_info_blocks(gpe_block);
 933         if (ACPI_FAILURE(status)) {
 934                 ACPI_FREE(gpe_block);
 935                 return_ACPI_STATUS(status);
 936         }
 937
 938         /* Install the new block in the global lists */
 939
 940         status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
 941         if (ACPI_FAILURE(status)) {
 942                 ACPI_FREE(gpe_block);
 943                 return_ACPI_STATUS(status);
 944         }
 945
 946         /* Find all GPE methods (_Lxx, _Exx) for this block */
 947
 948         status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
 949                                         ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
 950                                         acpi_ev_save_method_info, gpe_block,
 951                                         NULL);
 952
 953         /* Return the new block */
 954
 955         if (return_gpe_block) {
 956                 (*return_gpe_block) = gpe_block;
 957         }
 958
 959         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 960                           "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
 961                           (u32) gpe_block->block_base_number,
 962                           (u32) (gpe_block->block_base_number +
 963                                  ((gpe_block->register_count *
 964                                    ACPI_GPE_REGISTER_WIDTH) - 1)),
 965                           gpe_device->name.ascii, gpe_block->register_count,
 966                           interrupt_number));
 967
 968         /* Update global count of currently available GPEs */
 969
 970         acpi_current_gpe_count += register_count * ACPI_GPE_REGISTER_WIDTH;
 971         return_ACPI_STATUS(AE_OK);
 972 }
 973
 974 /*******************************************************************************
 975  *
 976  * FUNCTION:    acpi_ev_initialize_gpe_block
 977  *
 978  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 979  *              gpe_block           - Gpe Block info
 980  *
 981  * RETURN:      Status
 982  *
 983  * DESCRIPTION: Initialize and enable a GPE block. First find and run any
 984  *              _PRT methods associated with the block, then enable the
 985  *              appropriate GPEs.
 986  *              Note: Assumes namespace is locked.
 987  *
 988  ******************************************************************************/
 989
 990 acpi_status
 991 acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
 992                              struct acpi_gpe_block_info *gpe_block)
 993 {
 994         acpi_status status;
 995         struct acpi_gpe_event_info *gpe_event_info;
 996         struct acpi_gpe_walk_info gpe_info;
 997         u32 wake_gpe_count;
 998         u32 gpe_enabled_count;
 999         u32 i;
1000         u32 j;
1001
1002         ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);
1003
1004         /* Ignore a null GPE block (e.g., if no GPE block 1 exists) */
1005
1006         if (!gpe_block) {
1007                 return_ACPI_STATUS(AE_OK);
1008         }
1009
1010         /*
1011          * Runtime option: Should wake GPEs be enabled at runtime?  The default
1012          * is no, they should only be enabled just as the machine goes to sleep.
1013          */
1014         if (acpi_gbl_leave_wake_gpes_disabled) {
1015                 /*
1016                  * Differentiate runtime vs wake GPEs, via the _PRW control methods.
1017                  * Each GPE that has one or more _PRWs that reference it is by
1018                  * definition a wake GPE and will not be enabled while the machine
1019                  * is running.
1020                  */
1021                 gpe_info.gpe_block = gpe_block;
1022                 gpe_info.gpe_device = gpe_device;
1023
1024                 status =
1025                     acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1026                                            ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
1027                                            acpi_ev_match_prw_and_gpe, &gpe_info,
1028                                            NULL);
1029         }
1030
1031         /*
1032          * Enable all GPEs in this block that have these attributes:
1033          * 1) are "runtime" or "run/wake" GPEs, and
1034          * 2) have a corresponding _Lxx or _Exx method
1035          *
1036          * Any other GPEs within this block must be enabled via the acpi_enable_gpe()
1037          * external interface.
1038          */
1039         wake_gpe_count = 0;
1040         gpe_enabled_count = 0;
1041
1042         for (i = 0; i < gpe_block->register_count; i++) {
1043                 for (j = 0; j < 8; j++) {
1044
1045                         /* Get the info block for this particular GPE */
1046
1047                         gpe_event_info =
1048                             &gpe_block->
1049                             event_info[((acpi_size) i *
1050                                         ACPI_GPE_REGISTER_WIDTH) + j];
1051
1052                         if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
1053                              ACPI_GPE_DISPATCH_METHOD)
1054                             && (gpe_event_info->flags & ACPI_GPE_TYPE_RUNTIME)) {
1055                                 gpe_enabled_count++;
1056                         }
1057
1058                         if (gpe_event_info->flags & ACPI_GPE_TYPE_WAKE) {
1059                                 wake_gpe_count++;
1060                         }
1061                 }
1062         }
1063
1064         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1065                           "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
1066                           wake_gpe_count, gpe_enabled_count));
1067
1068         /* Enable all valid runtime GPEs found above */
1069
1070         status = acpi_hw_enable_runtime_gpe_block(NULL, gpe_block, NULL);
1071         if (ACPI_FAILURE(status)) {
1072                 ACPI_ERROR((AE_INFO, "Could not enable GPEs in GpeBlock %p",
1073                             gpe_block));
1074         }
1075
1076         return_ACPI_STATUS(status);
1077 }
1078
1079 /*******************************************************************************
1080  *
1081  * FUNCTION:    acpi_ev_gpe_initialize
1082  *
1083  * PARAMETERS:  None
1084  *
1085  * RETURN:      Status
1086  *
1087  * DESCRIPTION: Initialize the GPE data structures
1088  *
1089  ******************************************************************************/
1090
1091 acpi_status acpi_ev_gpe_initialize(void)
1092 {
1093         u32 register_count0 = 0;
1094         u32 register_count1 = 0;
1095         u32 gpe_number_max = 0;
1096         acpi_status status;
1097
1098         ACPI_FUNCTION_TRACE(ev_gpe_initialize);
1099
1100         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
1101         if (ACPI_FAILURE(status)) {
1102                 return_ACPI_STATUS(status);
1103         }
1104
1105         /*
1106          * Initialize the GPE Block(s) defined in the FADT
1107          *
1108          * Why the GPE register block lengths are divided by 2:  From the ACPI Spec,
1109          * section "General-Purpose Event Registers", we have:
1110          *
1111          * "Each register block contains two registers of equal length
1112          *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
1113          *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
1114          *  The length of the GPE1_STS and GPE1_EN registers is equal to
1115          *  half the GPE1_LEN. If a generic register block is not supported
1116          *  then its respective block pointer and block length values in the
1117          *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
1118          *  to be the same size."
1119          */
1120
1121         /*
1122          * Determine the maximum GPE number for this machine.
1123          *
1124          * Note: both GPE0 and GPE1 are optional, and either can exist without
1125          * the other.
1126          *
1127          * If EITHER the register length OR the block address are zero, then that
1128          * particular block is not supported.
1129          */
1130         if (acpi_gbl_FADT.gpe0_block_length &&
1131             acpi_gbl_FADT.xgpe0_block.address) {
1132
1133                 /* GPE block 0 exists (has both length and address > 0) */
1134
1135                 register_count0 = (u16) (acpi_gbl_FADT.gpe0_block_length / 2);
1136
1137                 gpe_number_max =
1138                     (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
1139
1140                 /* Install GPE Block 0 */
1141
1142                 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1143                                                   &acpi_gbl_FADT.xgpe0_block,
1144                                                   register_count0, 0,
1145                                                   acpi_gbl_FADT.sci_interrupt,
1146                                                   &acpi_gbl_gpe_fadt_blocks[0]);
1147
1148                 if (ACPI_FAILURE(status)) {
1149                         ACPI_EXCEPTION((AE_INFO, status,
1150                                         "Could not create GPE Block 0"));
1151                 }
1152         }
1153
1154         if (acpi_gbl_FADT.gpe1_block_length &&
1155             acpi_gbl_FADT.xgpe1_block.address) {
1156
1157                 /* GPE block 1 exists (has both length and address > 0) */
1158
1159                 register_count1 = (u16) (acpi_gbl_FADT.gpe1_block_length / 2);
1160
1161                 /* Check for GPE0/GPE1 overlap (if both banks exist) */
1162
1163                 if ((register_count0) &&
1164                     (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
1165                         ACPI_ERROR((AE_INFO,
1166                                     "GPE0 block (GPE 0 to %d) overlaps the GPE1 block (GPE %d to %d) - Ignoring GPE1",
1167                                     gpe_number_max, acpi_gbl_FADT.gpe1_base,
1168                                     acpi_gbl_FADT.gpe1_base +
1169                                     ((register_count1 *
1170                                       ACPI_GPE_REGISTER_WIDTH) - 1)));
1171
1172                         /* Ignore GPE1 block by setting the register count to zero */
1173
1174                         register_count1 = 0;
1175                 } else {
1176                         /* Install GPE Block 1 */
1177
1178                         status =
1179                             acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1180                                                      &acpi_gbl_FADT.xgpe1_block,
1181                                                      register_count1,
1182                                                      acpi_gbl_FADT.gpe1_base,
1183                                                      acpi_gbl_FADT.
1184                                                      sci_interrupt,
1185                                                      &acpi_gbl_gpe_fadt_blocks
1186                                                      [1]);
1187
1188                         if (ACPI_FAILURE(status)) {
1189                                 ACPI_EXCEPTION((AE_INFO, status,
1190                                                 "Could not create GPE Block 1"));
1191                         }
1192
1193                         /*
1194                          * GPE0 and GPE1 do not have to be contiguous in the GPE number
1195                          * space. However, GPE0 always starts at GPE number zero.
1196                          */
1197                         gpe_number_max = acpi_gbl_FADT.gpe1_base +
1198                             ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
1199                 }
1200         }
1201
1202         /* Exit if there are no GPE registers */
1203
1204         if ((register_count0 + register_count1) == 0) {
1205
1206                 /* GPEs are not required by ACPI, this is OK */
1207
1208                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1209                                   "There are no GPE blocks defined in the FADT\n"));
1210                 status = AE_OK;
1211                 goto cleanup;
1212         }
1213
1214         /* Check for Max GPE number out-of-range */
1215
1216         if (gpe_number_max > ACPI_GPE_MAX) {
1217                 ACPI_ERROR((AE_INFO,
1218                             "Maximum GPE number from FADT is too large: 0x%X",
1219                             gpe_number_max));
1220                 status = AE_BAD_VALUE;
1221                 goto cleanup;
1222         }
1223
1224       cleanup:
1225         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
1226         return_ACPI_STATUS(AE_OK);
1227 }