drivers/acpi/events/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 <acpi/acevents.h>
  46 #include <acpi/acnamesp.h>
  47
  48 #define _COMPONENT          ACPI_EVENTS
  49 ACPI_MODULE_NAME("evgpeblk")
  50
  51 /* Local prototypes */
  52 static acpi_status
  53 acpi_ev_save_method_info(acpi_handle obj_handle,
  54                          u32 level, void *obj_desc, void **return_value);
  55
  56 static acpi_status
  57 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
  58                           u32 level, void *info, void **return_value);
  59
  60 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
  61                                                                interrupt_number);
  62
  63 static acpi_status
  64 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt);
  65
  66 static acpi_status
  67 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
  68                           u32 interrupt_number);
  69
  70 static acpi_status
  71 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block);
  72
  73 /*******************************************************************************
  74  *
  75  * FUNCTION:    acpi_ev_valid_gpe_event
  76  *
  77  * PARAMETERS:  gpe_event_info              - Info for this GPE
  78  *
  79  * RETURN:      TRUE if the gpe_event is valid
  80  *
  81  * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
  82  *              Should be called only when the GPE lists are semaphore locked
  83  *              and not subject to change.
  84  *
  85  ******************************************************************************/
  86
  87 u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
  88 {
  89         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
  90         struct acpi_gpe_block_info *gpe_block;
  91
  92         ACPI_FUNCTION_ENTRY();
  93
  94         /* No need for spin lock since we are not changing any list elements */
  95
  96         /* Walk the GPE interrupt levels */
  97
  98         gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
  99         while (gpe_xrupt_block) {
 100                 gpe_block = gpe_xrupt_block->gpe_block_list_head;
 101
 102                 /* Walk the GPE blocks on this interrupt level */
 103
 104                 while (gpe_block) {
 105                         if ((&gpe_block->event_info[0] <= gpe_event_info) &&
 106                             (&gpe_block->
 107                              event_info[((acpi_size) gpe_block->
 108                                          register_count) * 8] >
 109                              gpe_event_info)) {
 110                                 return (TRUE);
 111                         }
 112
 113                         gpe_block = gpe_block->next;
 114                 }
 115
 116                 gpe_xrupt_block = gpe_xrupt_block->next;
 117         }
 118
 119         return (FALSE);
 120 }
 121
 122 /*******************************************************************************
 123  *
 124  * FUNCTION:    acpi_ev_walk_gpe_list
 125  *
 126  * PARAMETERS:  gpe_walk_callback   - Routine called for each GPE block
 127  *
 128  * RETURN:      Status
 129  *
 130  * DESCRIPTION: Walk the GPE lists.
 131  *
 132  ******************************************************************************/
 133
 134 acpi_status acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback)
 135 {
 136         struct acpi_gpe_block_info *gpe_block;
 137         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 138         acpi_status status = AE_OK;
 139         acpi_cpu_flags flags;
 140
 141         ACPI_FUNCTION_TRACE(ev_walk_gpe_list);
 142
 143         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 144
 145         /* Walk the interrupt level descriptor list */
 146
 147         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 148         while (gpe_xrupt_info) {
 149
 150                 /* Walk all Gpe Blocks attached to this interrupt level */
 151
 152                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 153                 while (gpe_block) {
 154
 155                         /* One callback per GPE block */
 156
 157                         status = gpe_walk_callback(gpe_xrupt_info, gpe_block);
 158                         if (ACPI_FAILURE(status)) {
 159                                 goto unlock_and_exit;
 160                         }
 161
 162                         gpe_block = gpe_block->next;
 163                 }
 164
 165                 gpe_xrupt_info = gpe_xrupt_info->next;
 166         }
 167
 168       unlock_and_exit:
 169         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 170         return_ACPI_STATUS(status);
 171 }
 172
 173 /*******************************************************************************
 174  *
 175  * FUNCTION:    acpi_ev_delete_gpe_handlers
 176  *
 177  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 178  *              gpe_block           - Gpe Block info
 179  *
 180  * RETURN:      Status
 181  *
 182  * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
 183  *              Used only prior to termination.
 184  *
 185  ******************************************************************************/
 186
 187 acpi_status
 188 acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 189                             struct acpi_gpe_block_info *gpe_block)
 190 {
 191         struct acpi_gpe_event_info *gpe_event_info;
 192         acpi_native_uint i;
 193         acpi_native_uint j;
 194
 195         ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);
 196
 197         /* Examine each GPE Register within the block */
 198
 199         for (i = 0; i < gpe_block->register_count; i++) {
 200
 201                 /* Now look at the individual GPEs in this byte register */
 202
 203                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 204                         gpe_event_info =
 205                             &gpe_block->
 206                             event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j];
 207
 208                         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 209                             ACPI_GPE_DISPATCH_HANDLER) {
 210                                 ACPI_FREE(gpe_event_info->dispatch.handler);
 211                                 gpe_event_info->dispatch.handler = NULL;
 212                                 gpe_event_info->flags &=
 213                                     ~ACPI_GPE_DISPATCH_MASK;
 214                         }
 215                 }
 216         }
 217
 218         return_ACPI_STATUS(AE_OK);
 219 }
 220
 221 /*******************************************************************************
 222  *
 223  * FUNCTION:    acpi_ev_save_method_info
 224  *
 225  * PARAMETERS:  Callback from walk_namespace
 226  *
 227  * RETURN:      Status
 228  *
 229  * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
 230  *              control method under the _GPE portion of the namespace.
 231  *              Extract the name and GPE type from the object, saving this
 232  *              information for quick lookup during GPE dispatch
 233  *
 234  *              The name of each GPE control method is of the form:
 235  *              "_Lxx" or "_Exx"
 236  *              Where:
 237  *                  L      - means that the GPE is level triggered
 238  *                  E      - means that the GPE is edge triggered
 239  *                  xx     - is the GPE number [in HEX]
 240  *
 241  ******************************************************************************/
 242
 243 static acpi_status
 244 acpi_ev_save_method_info(acpi_handle obj_handle,
 245                          u32 level, void *obj_desc, void **return_value)
 246 {
 247         struct acpi_gpe_block_info *gpe_block = (void *)obj_desc;
 248         struct acpi_gpe_event_info *gpe_event_info;
 249         u32 gpe_number;
 250         char name[ACPI_NAME_SIZE + 1];
 251         u8 type;
 252         acpi_status status;
 253
 254         ACPI_FUNCTION_TRACE(ev_save_method_info);
 255
 256         /*
 257          * _Lxx and _Exx GPE method support
 258          *
 259          * 1) Extract the name from the object and convert to a string
 260          */
 261         ACPI_MOVE_32_TO_32(name,
 262                            &((struct acpi_namespace_node *)obj_handle)->name.
 263                            integer);
 264         name[ACPI_NAME_SIZE] = 0;
 265
 266         /*
 267          * 2) Edge/Level determination is based on the 2nd character
 268          *    of the method name
 269          *
 270          * NOTE: Default GPE type is RUNTIME. May be changed later to WAKE
 271          * if a _PRW object is found that points to this GPE.
 272          */
 273         switch (name[1]) {
 274         case 'L':
 275                 type = ACPI_GPE_LEVEL_TRIGGERED;
 276                 break;
 277
 278         case 'E':
 279                 type = ACPI_GPE_EDGE_TRIGGERED;
 280                 break;
 281
 282         default:
 283                 /* Unknown method type, just ignore it! */
 284
 285                 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 286                                   "Ignoring unknown GPE method type: %s (name not of form _Lxx or _Exx)",
 287                                   name));
 288                 return_ACPI_STATUS(AE_OK);
 289         }
 290
 291         /* Convert the last two characters of the name to the GPE Number */
 292
 293         gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
 294         if (gpe_number == ACPI_UINT32_MAX) {
 295
 296                 /* Conversion failed; invalid method, just ignore it */
 297
 298                 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 299                                   "Could not extract GPE number from name: %s (name is not of form _Lxx or _Exx)",
 300                                   name));
 301                 return_ACPI_STATUS(AE_OK);
 302         }
 303
 304         /* Ensure that we have a valid GPE number for this GPE block */
 305
 306         if ((gpe_number < gpe_block->block_base_number) ||
 307             (gpe_number >=
 308              (gpe_block->block_base_number +
 309               (gpe_block->register_count * 8)))) {
 310                 /*
 311                  * Not valid for this GPE block, just ignore it
 312                  * However, it may be valid for a different GPE block, since GPE0 and GPE1
 313                  * methods both appear under \_GPE.
 314                  */
 315                 return_ACPI_STATUS(AE_OK);
 316         }
 317
 318         /*
 319          * Now we can add this information to the gpe_event_info block
 320          * for use during dispatch of this GPE. Default type is RUNTIME, although
 321          * this may change when the _PRW methods are executed later.
 322          */
 323         gpe_event_info =
 324             &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
 325
 326         gpe_event_info->flags = (u8)
 327             (type | ACPI_GPE_DISPATCH_METHOD | ACPI_GPE_TYPE_RUNTIME);
 328
 329         gpe_event_info->dispatch.method_node =
 330             (struct acpi_namespace_node *)obj_handle;
 331
 332         /* Update enable mask, but don't enable the HW GPE as of yet */
 333
 334         status = acpi_ev_enable_gpe(gpe_event_info, FALSE);
 335
 336         ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 337                           "Registered GPE method %s as GPE number 0x%.2X\n",
 338                           name, gpe_number));
 339         return_ACPI_STATUS(status);
 340 }
 341
 342 /*******************************************************************************
 343  *
 344  * FUNCTION:    acpi_ev_match_prw_and_gpe
 345  *
 346  * PARAMETERS:  Callback from walk_namespace
 347  *
 348  * RETURN:      Status. NOTE: We ignore errors so that the _PRW walk is
 349  *              not aborted on a single _PRW failure.
 350  *
 351  * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
 352  *              Device. Run the _PRW method. If present, extract the GPE
 353  *              number and mark the GPE as a WAKE GPE.
 354  *
 355  ******************************************************************************/
 356
 357 static acpi_status
 358 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
 359                           u32 level, void *info, void **return_value)
 360 {
 361         struct acpi_gpe_walk_info *gpe_info = (void *)info;
 362         struct acpi_namespace_node *gpe_device;
 363         struct acpi_gpe_block_info *gpe_block;
 364         struct acpi_namespace_node *target_gpe_device;
 365         struct acpi_gpe_event_info *gpe_event_info;
 366         union acpi_operand_object *pkg_desc;
 367         union acpi_operand_object *obj_desc;
 368         u32 gpe_number;
 369         acpi_status status;
 370
 371         ACPI_FUNCTION_TRACE(ev_match_prw_and_gpe);
 372
 373         /* Check for a _PRW method under this device */
 374
 375         status = acpi_ut_evaluate_object(obj_handle, METHOD_NAME__PRW,
 376                                          ACPI_BTYPE_PACKAGE, &pkg_desc);
 377         if (ACPI_FAILURE(status)) {
 378
 379                 /* Ignore all errors from _PRW, we don't want to abort the subsystem */
 380
 381                 return_ACPI_STATUS(AE_OK);
 382         }
 383
 384         /* The returned _PRW package must have at least two elements */
 385
 386         if (pkg_desc->package.count < 2) {
 387                 goto cleanup;
 388         }
 389
 390         /* Extract pointers from the input context */
 391
 392         gpe_device = gpe_info->gpe_device;
 393         gpe_block = gpe_info->gpe_block;
 394
 395         /*
 396          * The _PRW object must return a package, we are only interested
 397          * in the first element
 398          */
 399         obj_desc = pkg_desc->package.elements[0];
 400
 401         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 402
 403                 /* Use FADT-defined GPE device (from definition of _PRW) */
 404
 405                 target_gpe_device = acpi_gbl_fadt_gpe_device;
 406
 407                 /* Integer is the GPE number in the FADT described GPE blocks */
 408
 409                 gpe_number = (u32) obj_desc->integer.value;
 410         } else if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_PACKAGE) {
 411
 412                 /* Package contains a GPE reference and GPE number within a GPE block */
 413
 414                 if ((obj_desc->package.count < 2) ||
 415                     (ACPI_GET_OBJECT_TYPE(obj_desc->package.elements[0]) !=
 416                      ACPI_TYPE_LOCAL_REFERENCE)
 417                     || (ACPI_GET_OBJECT_TYPE(obj_desc->package.elements[1]) !=
 418                         ACPI_TYPE_INTEGER)) {
 419                         goto cleanup;
 420                 }
 421
 422                 /* Get GPE block reference and decode */
 423
 424                 target_gpe_device =
 425                     obj_desc->package.elements[0]->reference.node;
 426                 gpe_number = (u32) obj_desc->package.elements[1]->integer.value;
 427         } else {
 428                 /* Unknown type, just ignore it */
 429
 430                 goto cleanup;
 431         }
 432
 433         /*
 434          * Is this GPE within this block?
 435          *
 436          * TRUE iff these conditions are true:
 437          *     1) The GPE devices match.
 438          *     2) The GPE index(number) is within the range of the Gpe Block
 439          *          associated with the GPE device.
 440          */
 441         if ((gpe_device == target_gpe_device) &&
 442             (gpe_number >= gpe_block->block_base_number) &&
 443             (gpe_number <
 444              gpe_block->block_base_number + (gpe_block->register_count * 8))) {
 445                 gpe_event_info =
 446                     &gpe_block->event_info[gpe_number -
 447                                            gpe_block->block_base_number];
 448
 449                 /* Mark GPE for WAKE-ONLY but WAKE_DISABLED */
 450
 451                 gpe_event_info->flags &=
 452                     ~(ACPI_GPE_WAKE_ENABLED | ACPI_GPE_RUN_ENABLED);
 453
 454                 status =
 455                     acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
 456                 if (ACPI_FAILURE(status)) {
 457                         goto cleanup;
 458                 }
 459                 status =
 460                     acpi_ev_update_gpe_enable_masks(gpe_event_info,
 461                                                     ACPI_GPE_DISABLE);
 462         }
 463
 464       cleanup:
 465         acpi_ut_remove_reference(pkg_desc);
 466         return_ACPI_STATUS(AE_OK);
 467 }
 468
 469 /*******************************************************************************
 470  *
 471  * FUNCTION:    acpi_ev_get_gpe_xrupt_block
 472  *
 473  * PARAMETERS:  interrupt_number     - Interrupt for a GPE block
 474  *
 475  * RETURN:      A GPE interrupt block
 476  *
 477  * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
 478  *              block per unique interrupt level used for GPEs.
 479  *              Should be called only when the GPE lists are semaphore locked
 480  *              and not subject to change.
 481  *
 482  ******************************************************************************/
 483
 484 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
 485                                                                interrupt_number)
 486 {
 487         struct acpi_gpe_xrupt_info *next_gpe_xrupt;
 488         struct acpi_gpe_xrupt_info *gpe_xrupt;
 489         acpi_status status;
 490         acpi_cpu_flags flags;
 491
 492         ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
 493
 494         /* No need for lock since we are not changing any list elements here */
 495
 496         next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 497         while (next_gpe_xrupt) {
 498                 if (next_gpe_xrupt->interrupt_number == interrupt_number) {
 499                         return_PTR(next_gpe_xrupt);
 500                 }
 501
 502                 next_gpe_xrupt = next_gpe_xrupt->next;
 503         }
 504
 505         /* Not found, must allocate a new xrupt descriptor */
 506
 507         gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
 508         if (!gpe_xrupt) {
 509                 return_PTR(NULL);
 510         }
 511
 512         gpe_xrupt->interrupt_number = interrupt_number;
 513
 514         /* Install new interrupt descriptor with spin lock */
 515
 516         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 517         if (acpi_gbl_gpe_xrupt_list_head) {
 518                 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 519                 while (next_gpe_xrupt->next) {
 520                         next_gpe_xrupt = next_gpe_xrupt->next;
 521                 }
 522
 523                 next_gpe_xrupt->next = gpe_xrupt;
 524                 gpe_xrupt->previous = next_gpe_xrupt;
 525         } else {
 526                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
 527         }
 528         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 529
 530         /* Install new interrupt handler if not SCI_INT */
 531
 532         if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
 533                 status = acpi_os_install_interrupt_handler(interrupt_number,
 534                                                            acpi_ev_gpe_xrupt_handler,
 535                                                            gpe_xrupt);
 536                 if (ACPI_FAILURE(status)) {
 537                         ACPI_ERROR((AE_INFO,
 538                                     "Could not install GPE interrupt handler at level 0x%X",
 539                                     interrupt_number));
 540                         return_PTR(NULL);
 541                 }
 542         }
 543
 544         return_PTR(gpe_xrupt);
 545 }
 546
 547 /*******************************************************************************
 548  *
 549  * FUNCTION:    acpi_ev_delete_gpe_xrupt
 550  *
 551  * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block
 552  *
 553  * RETURN:      Status
 554  *
 555  * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
 556  *              interrupt handler if not the SCI interrupt.
 557  *
 558  ******************************************************************************/
 559
 560 static acpi_status
 561 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
 562 {
 563         acpi_status status;
 564         acpi_cpu_flags flags;
 565
 566         ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
 567
 568         /* We never want to remove the SCI interrupt handler */
 569
 570         if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
 571                 gpe_xrupt->gpe_block_list_head = NULL;
 572                 return_ACPI_STATUS(AE_OK);
 573         }
 574
 575         /* Disable this interrupt */
 576
 577         status =
 578             acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
 579                                              acpi_ev_gpe_xrupt_handler);
 580         if (ACPI_FAILURE(status)) {
 581                 return_ACPI_STATUS(status);
 582         }
 583
 584         /* Unlink the interrupt block with lock */
 585
 586         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 587         if (gpe_xrupt->previous) {
 588                 gpe_xrupt->previous->next = gpe_xrupt->next;
 589         } else {
 590                 /* No previous, update list head */
 591
 592                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
 593         }
 594
 595         if (gpe_xrupt->next) {
 596                 gpe_xrupt->next->previous = gpe_xrupt->previous;
 597         }
 598         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 599
 600         /* Free the block */
 601
 602         ACPI_FREE(gpe_xrupt);
 603         return_ACPI_STATUS(AE_OK);
 604 }
 605
 606 /*******************************************************************************
 607  *
 608  * FUNCTION:    acpi_ev_install_gpe_block
 609  *
 610  * PARAMETERS:  gpe_block       - New GPE block
 611  *              interrupt_number - Xrupt to be associated with this GPE block
 612  *
 613  * RETURN:      Status
 614  *
 615  * DESCRIPTION: Install new GPE block with mutex support
 616  *
 617  ******************************************************************************/
 618
 619 static acpi_status
 620 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
 621                           u32 interrupt_number)
 622 {
 623         struct acpi_gpe_block_info *next_gpe_block;
 624         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
 625         acpi_status status;
 626         acpi_cpu_flags flags;
 627
 628         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
 629
 630         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 631         if (ACPI_FAILURE(status)) {
 632                 return_ACPI_STATUS(status);
 633         }
 634
 635         gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block(interrupt_number);
 636         if (!gpe_xrupt_block) {
 637                 status = AE_NO_MEMORY;
 638                 goto unlock_and_exit;
 639         }
 640
 641         /* Install the new block at the end of the list with lock */
 642
 643         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 644         if (gpe_xrupt_block->gpe_block_list_head) {
 645                 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
 646                 while (next_gpe_block->next) {
 647                         next_gpe_block = next_gpe_block->next;
 648                 }
 649
 650                 next_gpe_block->next = gpe_block;
 651                 gpe_block->previous = next_gpe_block;
 652         } else {
 653                 gpe_xrupt_block->gpe_block_list_head = gpe_block;
 654         }
 655
 656         gpe_block->xrupt_block = gpe_xrupt_block;
 657         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 658
 659       unlock_and_exit:
 660         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 661         return_ACPI_STATUS(status);
 662 }
 663
 664 /*******************************************************************************
 665  *
 666  * FUNCTION:    acpi_ev_delete_gpe_block
 667  *
 668  * PARAMETERS:  gpe_block       - Existing GPE block
 669  *
 670  * RETURN:      Status
 671  *
 672  * DESCRIPTION: Remove a GPE block
 673  *
 674  ******************************************************************************/
 675
 676 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
 677 {
 678         acpi_status status;
 679         acpi_cpu_flags flags;
 680
 681         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
 682
 683         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 684         if (ACPI_FAILURE(status)) {
 685                 return_ACPI_STATUS(status);
 686         }
 687
 688         /* Disable all GPEs in this block */
 689
 690         status = acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block);
 691
 692         if (!gpe_block->previous && !gpe_block->next) {
 693
 694                 /* This is the last gpe_block on this interrupt */
 695
 696                 status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
 697                 if (ACPI_FAILURE(status)) {
 698                         goto unlock_and_exit;
 699                 }
 700         } else {
 701                 /* Remove the block on this interrupt with lock */
 702
 703                 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 704                 if (gpe_block->previous) {
 705                         gpe_block->previous->next = gpe_block->next;
 706                 } else {
 707                         gpe_block->xrupt_block->gpe_block_list_head =
 708                             gpe_block->next;
 709                 }
 710
 711                 if (gpe_block->next) {
 712                         gpe_block->next->previous = gpe_block->previous;
 713                 }
 714                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 715         }
 716
 717         /* Free the gpe_block */
 718
 719         ACPI_FREE(gpe_block->register_info);
 720         ACPI_FREE(gpe_block->event_info);
 721         ACPI_FREE(gpe_block);
 722
 723       unlock_and_exit:
 724         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 725         return_ACPI_STATUS(status);
 726 }
 727
 728 /*******************************************************************************
 729  *
 730  * FUNCTION:    acpi_ev_create_gpe_info_blocks
 731  *
 732  * PARAMETERS:  gpe_block   - New GPE block
 733  *
 734  * RETURN:      Status
 735  *
 736  * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
 737  *
 738  ******************************************************************************/
 739
 740 static acpi_status
 741 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
 742 {
 743         struct acpi_gpe_register_info *gpe_register_info = NULL;
 744         struct acpi_gpe_event_info *gpe_event_info = NULL;
 745         struct acpi_gpe_event_info *this_event;
 746         struct acpi_gpe_register_info *this_register;
 747         acpi_native_uint i;
 748         acpi_native_uint j;
 749         acpi_status status;
 750
 751         ACPI_FUNCTION_TRACE(ev_create_gpe_info_blocks);
 752
 753         /* Allocate the GPE register information block */
 754
 755         gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->
 756                                                  register_count *
 757                                                  sizeof(struct
 758                                                         acpi_gpe_register_info));
 759         if (!gpe_register_info) {
 760                 ACPI_ERROR((AE_INFO,
 761                             "Could not allocate the GpeRegisterInfo table"));
 762                 return_ACPI_STATUS(AE_NO_MEMORY);
 763         }
 764
 765         /*
 766          * Allocate the GPE event_info block. There are eight distinct GPEs
 767          * per register. Initialization to zeros is sufficient.
 768          */
 769         gpe_event_info = ACPI_ALLOCATE_ZEROED(((acpi_size) gpe_block->
 770                                                register_count *
 771                                                ACPI_GPE_REGISTER_WIDTH) *
 772                                               sizeof(struct
 773                                                      acpi_gpe_event_info));
 774         if (!gpe_event_info) {
 775                 ACPI_ERROR((AE_INFO,
 776                             "Could not allocate the GpeEventInfo table"));
 777                 status = AE_NO_MEMORY;
 778                 goto error_exit;
 779         }
 780
 781         /* Save the new Info arrays in the GPE block */
 782
 783         gpe_block->register_info = gpe_register_info;
 784         gpe_block->event_info = gpe_event_info;
 785
 786         /*
 787          * Initialize the GPE Register and Event structures. A goal of these
 788          * tables is to hide the fact that there are two separate GPE register sets
 789          * in a given GPE hardware block, the status registers occupy the first half,
 790          * and the enable registers occupy the second half.
 791          */
 792         this_register = gpe_register_info;
 793         this_event = gpe_event_info;
 794
 795         for (i = 0; i < gpe_block->register_count; i++) {
 796
 797                 /* Init the register_info for this GPE register (8 GPEs) */
 798
 799                 this_register->base_gpe_number =
 800                     (u8) (gpe_block->block_base_number +
 801                           (i * ACPI_GPE_REGISTER_WIDTH));
 802
 803                 this_register->status_address.address =
 804                     gpe_block->block_address.address + i;
 805
 806                 this_register->enable_address.address =
 807                     gpe_block->block_address.address + i +
 808                     gpe_block->register_count;
 809
 810                 this_register->status_address.space_id =
 811                     gpe_block->block_address.space_id;
 812                 this_register->enable_address.space_id =
 813                     gpe_block->block_address.space_id;
 814                 this_register->status_address.bit_width =
 815                     ACPI_GPE_REGISTER_WIDTH;
 816                 this_register->enable_address.bit_width =
 817                     ACPI_GPE_REGISTER_WIDTH;
 818                 this_register->status_address.bit_offset =
 819                     ACPI_GPE_REGISTER_WIDTH;
 820                 this_register->enable_address.bit_offset =
 821                     ACPI_GPE_REGISTER_WIDTH;
 822
 823                 /* Init the event_info for each GPE within this register */
 824
 825                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 826                         this_event->gpe_number =
 827                             (u8) (this_register->base_gpe_number + j);
 828                         this_event->register_info = this_register;
 829                         this_event++;
 830                 }
 831
 832                 /* Disable all GPEs within this register */
 833
 834                 status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, 0x00,
 835                                                  &this_register->
 836                                                  enable_address);
 837                 if (ACPI_FAILURE(status)) {
 838                         goto error_exit;
 839                 }
 840
 841                 /* Clear any pending GPE events within this register */
 842
 843                 status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, 0xFF,
 844                                                  &this_register->
 845                                                  status_address);
 846                 if (ACPI_FAILURE(status)) {
 847                         goto error_exit;
 848                 }
 849
 850                 this_register++;
 851         }
 852
 853         return_ACPI_STATUS(AE_OK);
 854
 855       error_exit:
 856         if (gpe_register_info) {
 857                 ACPI_FREE(gpe_register_info);
 858         }
 859         if (gpe_event_info) {
 860                 ACPI_FREE(gpe_event_info);
 861         }
 862
 863         return_ACPI_STATUS(status);
 864 }
 865
 866 /*******************************************************************************
 867  *
 868  * FUNCTION:    acpi_ev_create_gpe_block
 869  *
 870  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 871  *              gpe_block_address   - Address and space_iD
 872  *              register_count      - Number of GPE register pairs in the block
 873  *              gpe_block_base_number - Starting GPE number for the block
 874  *              interrupt_number    - H/W interrupt for the block
 875  *              return_gpe_block    - Where the new block descriptor is returned
 876  *
 877  * RETURN:      Status
 878  *
 879  * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
 880  *              the block are disabled at exit.
 881  *              Note: Assumes namespace is locked.
 882  *
 883  ******************************************************************************/
 884
 885 acpi_status
 886 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
 887                          struct acpi_generic_address *gpe_block_address,
 888                          u32 register_count,
 889                          u8 gpe_block_base_number,
 890                          u32 interrupt_number,
 891                          struct acpi_gpe_block_info **return_gpe_block)
 892 {
 893         acpi_status status;
 894         struct acpi_gpe_block_info *gpe_block;
 895
 896         ACPI_FUNCTION_TRACE(ev_create_gpe_block);
 897
 898         if (!register_count) {
 899                 return_ACPI_STATUS(AE_OK);
 900         }
 901
 902         /* Allocate a new GPE block */
 903
 904         gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
 905         if (!gpe_block) {
 906                 return_ACPI_STATUS(AE_NO_MEMORY);
 907         }
 908
 909         /* Initialize the new GPE block */
 910
 911         gpe_block->node = gpe_device;
 912         gpe_block->register_count = register_count;
 913         gpe_block->block_base_number = gpe_block_base_number;
 914
 915         ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
 916                     sizeof(struct acpi_generic_address));
 917
 918         /*
 919          * Create the register_info and event_info sub-structures
 920          * Note: disables and clears all GPEs in the block
 921          */
 922         status = acpi_ev_create_gpe_info_blocks(gpe_block);
 923         if (ACPI_FAILURE(status)) {
 924                 ACPI_FREE(gpe_block);
 925                 return_ACPI_STATUS(status);
 926         }
 927
 928         /* Install the new block in the global lists */
 929
 930         status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
 931         if (ACPI_FAILURE(status)) {
 932                 ACPI_FREE(gpe_block);
 933                 return_ACPI_STATUS(status);
 934         }
 935
 936         /* Find all GPE methods (_Lxx, _Exx) for this block */
 937
 938         status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
 939                                         ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
 940                                         acpi_ev_save_method_info, gpe_block,
 941                                         NULL);
 942
 943         /* Return the new block */
 944
 945         if (return_gpe_block) {
 946                 (*return_gpe_block) = gpe_block;
 947         }
 948
 949         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 950                           "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
 951                           (u32) gpe_block->block_base_number,
 952                           (u32) (gpe_block->block_base_number +
 953                                  ((gpe_block->register_count *
 954                                    ACPI_GPE_REGISTER_WIDTH) - 1)),
 955                           gpe_device->name.ascii, gpe_block->register_count,
 956                           interrupt_number));
 957
 958         return_ACPI_STATUS(AE_OK);
 959 }
 960
 961 /*******************************************************************************
 962  *
 963  * FUNCTION:    acpi_ev_initialize_gpe_block
 964  *
 965  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 966  *              gpe_block           - Gpe Block info
 967  *
 968  * RETURN:      Status
 969  *
 970  * DESCRIPTION: Initialize and enable a GPE block. First find and run any
 971  *              _PRT methods associated with the block, then enable the
 972  *              appropriate GPEs.
 973  *              Note: Assumes namespace is locked.
 974  *
 975  ******************************************************************************/
 976
 977 acpi_status
 978 acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
 979                              struct acpi_gpe_block_info *gpe_block)
 980 {
 981         acpi_status status;
 982         struct acpi_gpe_event_info *gpe_event_info;
 983         struct acpi_gpe_walk_info gpe_info;
 984         u32 wake_gpe_count;
 985         u32 gpe_enabled_count;
 986         acpi_native_uint i;
 987         acpi_native_uint j;
 988
 989         ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);
 990
 991         /* Ignore a null GPE block (e.g., if no GPE block 1 exists) */
 992
 993         if (!gpe_block) {
 994                 return_ACPI_STATUS(AE_OK);
 995         }
 996
 997         /*
 998          * Runtime option: Should wake GPEs be enabled at runtime?  The default
 999          * is no, they should only be enabled just as the machine goes to sleep.
1000          */
1001         if (acpi_gbl_leave_wake_gpes_disabled) {
1002                 /*
1003                  * Differentiate runtime vs wake GPEs, via the _PRW control methods.
1004                  * Each GPE that has one or more _PRWs that reference it is by
1005                  * definition a wake GPE and will not be enabled while the machine
1006                  * is running.
1007                  */
1008                 gpe_info.gpe_block = gpe_block;
1009                 gpe_info.gpe_device = gpe_device;
1010
1011                 status =
1012                     acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1013                                            ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
1014                                            acpi_ev_match_prw_and_gpe, &gpe_info,
1015                                            NULL);
1016         }
1017
1018         /*
1019          * Enable all GPEs in this block that have these attributes:
1020          * 1) are "runtime" or "run/wake" GPEs, and
1021          * 2) have a corresponding _Lxx or _Exx method
1022          *
1023          * Any other GPEs within this block must be enabled via the acpi_enable_gpe()
1024          * external interface.
1025          */
1026         wake_gpe_count = 0;
1027         gpe_enabled_count = 0;
1028
1029         for (i = 0; i < gpe_block->register_count; i++) {
1030                 for (j = 0; j < 8; j++) {
1031
1032                         /* Get the info block for this particular GPE */
1033
1034                         gpe_event_info =
1035                             &gpe_block->
1036                             event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j];
1037
1038                         if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
1039                              ACPI_GPE_DISPATCH_METHOD)
1040                             && (gpe_event_info->flags & ACPI_GPE_TYPE_RUNTIME)) {
1041                                 gpe_enabled_count++;
1042                         }
1043
1044                         if (gpe_event_info->flags & ACPI_GPE_TYPE_WAKE) {
1045                                 wake_gpe_count++;
1046                         }
1047                 }
1048         }
1049
1050         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1051                           "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
1052                           wake_gpe_count, gpe_enabled_count));
1053
1054         /* Enable all valid runtime GPEs found above */
1055
1056         status = acpi_hw_enable_runtime_gpe_block(NULL, gpe_block);
1057         if (ACPI_FAILURE(status)) {
1058                 ACPI_ERROR((AE_INFO, "Could not enable GPEs in GpeBlock %p",
1059                             gpe_block));
1060         }
1061
1062         return_ACPI_STATUS(status);
1063 }
1064
1065 /*******************************************************************************
1066  *
1067  * FUNCTION:    acpi_ev_gpe_initialize
1068  *
1069  * PARAMETERS:  None
1070  *
1071  * RETURN:      Status
1072  *
1073  * DESCRIPTION: Initialize the GPE data structures
1074  *
1075  ******************************************************************************/
1076
1077 acpi_status acpi_ev_gpe_initialize(void)
1078 {
1079         u32 register_count0 = 0;
1080         u32 register_count1 = 0;
1081         u32 gpe_number_max = 0;
1082         acpi_status status;
1083
1084         ACPI_FUNCTION_TRACE(ev_gpe_initialize);
1085
1086         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
1087         if (ACPI_FAILURE(status)) {
1088                 return_ACPI_STATUS(status);
1089         }
1090
1091         /*
1092          * Initialize the GPE Block(s) defined in the FADT
1093          *
1094          * Why the GPE register block lengths are divided by 2:  From the ACPI Spec,
1095          * section "General-Purpose Event Registers", we have:
1096          *
1097          * "Each register block contains two registers of equal length
1098          *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
1099          *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
1100          *  The length of the GPE1_STS and GPE1_EN registers is equal to
1101          *  half the GPE1_LEN. If a generic register block is not supported
1102          *  then its respective block pointer and block length values in the
1103          *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
1104          *  to be the same size."
1105          */
1106
1107         /*
1108          * Determine the maximum GPE number for this machine.
1109          *
1110          * Note: both GPE0 and GPE1 are optional, and either can exist without
1111          * the other.
1112          *
1113          * If EITHER the register length OR the block address are zero, then that
1114          * particular block is not supported.
1115          */
1116         if (acpi_gbl_FADT.gpe0_block_length &&
1117             acpi_gbl_FADT.xgpe0_block.address) {
1118
1119                 /* GPE block 0 exists (has both length and address > 0) */
1120
1121                 register_count0 = (u16) (acpi_gbl_FADT.gpe0_block_length / 2);
1122
1123                 gpe_number_max =
1124                     (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
1125
1126                 /* Install GPE Block 0 */
1127
1128                 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1129                                                   &acpi_gbl_FADT.xgpe0_block,
1130                                                   register_count0, 0,
1131                                                   acpi_gbl_FADT.sci_interrupt,
1132                                                   &acpi_gbl_gpe_fadt_blocks[0]);
1133
1134                 if (ACPI_FAILURE(status)) {
1135                         ACPI_EXCEPTION((AE_INFO, status,
1136                                         "Could not create GPE Block 0"));
1137                 }
1138         }
1139
1140         if (acpi_gbl_FADT.gpe1_block_length &&
1141             acpi_gbl_FADT.xgpe1_block.address) {
1142
1143                 /* GPE block 1 exists (has both length and address > 0) */
1144
1145                 register_count1 = (u16) (acpi_gbl_FADT.gpe1_block_length / 2);
1146
1147                 /* Check for GPE0/GPE1 overlap (if both banks exist) */
1148
1149                 if ((register_count0) &&
1150                     (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
1151                         ACPI_ERROR((AE_INFO,
1152                                     "GPE0 block (GPE 0 to %d) overlaps the GPE1 block (GPE %d to %d) - Ignoring GPE1",
1153                                     gpe_number_max, acpi_gbl_FADT.gpe1_base,
1154                                     acpi_gbl_FADT.gpe1_base +
1155                                     ((register_count1 *
1156                                       ACPI_GPE_REGISTER_WIDTH) - 1)));
1157
1158                         /* Ignore GPE1 block by setting the register count to zero */
1159
1160                         register_count1 = 0;
1161                 } else {
1162                         /* Install GPE Block 1 */
1163
1164                         status =
1165                             acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1166                                                      &acpi_gbl_FADT.xgpe1_block,
1167                                                      register_count1,
1168                                                      acpi_gbl_FADT.gpe1_base,
1169                                                      acpi_gbl_FADT.
1170                                                      sci_interrupt,
1171                                                      &acpi_gbl_gpe_fadt_blocks
1172                                                      [1]);
1173
1174                         if (ACPI_FAILURE(status)) {
1175                                 ACPI_EXCEPTION((AE_INFO, status,
1176                                                 "Could not create GPE Block 1"));
1177                         }
1178
1179                         /*
1180                          * GPE0 and GPE1 do not have to be contiguous in the GPE number
1181                          * space. However, GPE0 always starts at GPE number zero.
1182                          */
1183                         gpe_number_max = acpi_gbl_FADT.gpe1_base +
1184                             ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
1185                 }
1186         }
1187
1188         /* Exit if there are no GPE registers */
1189
1190         if ((register_count0 + register_count1) == 0) {
1191
1192                 /* GPEs are not required by ACPI, this is OK */
1193
1194                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1195                                   "There are no GPE blocks defined in the FADT\n"));
1196                 status = AE_OK;
1197                 goto cleanup;
1198         }
1199
1200         /* Check for Max GPE number out-of-range */
1201
1202         if (gpe_number_max > ACPI_GPE_MAX) {
1203                 ACPI_ERROR((AE_INFO,
1204                             "Maximum GPE number from FADT is too large: 0x%X",
1205                             gpe_number_max));
1206                 status = AE_BAD_VALUE;
1207                 goto cleanup;
1208         }
1209
1210       cleanup:
1211         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
1212         return_ACPI_STATUS(AE_OK);
1213 }