drivers/acpi/events/evgpeblk.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeblk - GPE block creation and initialization.
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include <acpi/acevents.h>
  46 #include <acpi/acnamesp.h>
  47
  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_ERROR((AE_INFO,
 286                             "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_ERROR((AE_INFO,
 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_int) {
 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_int) {
 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         }
 590
 591         if (gpe_xrupt->next) {
 592                 gpe_xrupt->next->previous = gpe_xrupt->previous;
 593         }
 594         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 595
 596         /* Free the block */
 597
 598         ACPI_FREE(gpe_xrupt);
 599         return_ACPI_STATUS(AE_OK);
 600 }
 601
 602 /*******************************************************************************
 603  *
 604  * FUNCTION:    acpi_ev_install_gpe_block
 605  *
 606  * PARAMETERS:  gpe_block       - New GPE block
 607  *              interrupt_number - Xrupt to be associated with this GPE block
 608  *
 609  * RETURN:      Status
 610  *
 611  * DESCRIPTION: Install new GPE block with mutex support
 612  *
 613  ******************************************************************************/
 614
 615 static acpi_status
 616 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
 617                           u32 interrupt_number)
 618 {
 619         struct acpi_gpe_block_info *next_gpe_block;
 620         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
 621         acpi_status status;
 622         acpi_cpu_flags flags;
 623
 624         ACPI_FUNCTION_TRACE("ev_install_gpe_block");
 625
 626         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 627         if (ACPI_FAILURE(status)) {
 628                 return_ACPI_STATUS(status);
 629         }
 630
 631         gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block(interrupt_number);
 632         if (!gpe_xrupt_block) {
 633                 status = AE_NO_MEMORY;
 634                 goto unlock_and_exit;
 635         }
 636
 637         /* Install the new block at the end of the list with lock */
 638
 639         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 640         if (gpe_xrupt_block->gpe_block_list_head) {
 641                 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
 642                 while (next_gpe_block->next) {
 643                         next_gpe_block = next_gpe_block->next;
 644                 }
 645
 646                 next_gpe_block->next = gpe_block;
 647                 gpe_block->previous = next_gpe_block;
 648         } else {
 649                 gpe_xrupt_block->gpe_block_list_head = gpe_block;
 650         }
 651
 652         gpe_block->xrupt_block = gpe_xrupt_block;
 653         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 654
 655       unlock_and_exit:
 656         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 657         return_ACPI_STATUS(status);
 658 }
 659
 660 /*******************************************************************************
 661  *
 662  * FUNCTION:    acpi_ev_delete_gpe_block
 663  *
 664  * PARAMETERS:  gpe_block       - Existing GPE block
 665  *
 666  * RETURN:      Status
 667  *
 668  * DESCRIPTION: Remove a GPE block
 669  *
 670  ******************************************************************************/
 671
 672 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
 673 {
 674         acpi_status status;
 675         acpi_cpu_flags flags;
 676
 677         ACPI_FUNCTION_TRACE("ev_install_gpe_block");
 678
 679         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 680         if (ACPI_FAILURE(status)) {
 681                 return_ACPI_STATUS(status);
 682         }
 683
 684         /* Disable all GPEs in this block */
 685
 686         status = acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block);
 687
 688         if (!gpe_block->previous && !gpe_block->next) {
 689
 690                 /* This is the last gpe_block on this interrupt */
 691
 692                 status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
 693                 if (ACPI_FAILURE(status)) {
 694                         goto unlock_and_exit;
 695                 }
 696         } else {
 697                 /* Remove the block on this interrupt with lock */
 698
 699                 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 700                 if (gpe_block->previous) {
 701                         gpe_block->previous->next = gpe_block->next;
 702                 } else {
 703                         gpe_block->xrupt_block->gpe_block_list_head =
 704                             gpe_block->next;
 705                 }
 706
 707                 if (gpe_block->next) {
 708                         gpe_block->next->previous = gpe_block->previous;
 709                 }
 710                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 711         }
 712
 713         /* Free the gpe_block */
 714
 715         ACPI_FREE(gpe_block->register_info);
 716         ACPI_FREE(gpe_block->event_info);
 717         ACPI_FREE(gpe_block);
 718
 719       unlock_and_exit:
 720         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 721         return_ACPI_STATUS(status);
 722 }
 723
 724 /*******************************************************************************
 725  *
 726  * FUNCTION:    acpi_ev_create_gpe_info_blocks
 727  *
 728  * PARAMETERS:  gpe_block   - New GPE block
 729  *
 730  * RETURN:      Status
 731  *
 732  * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
 733  *
 734  ******************************************************************************/
 735
 736 static acpi_status
 737 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
 738 {
 739         struct acpi_gpe_register_info *gpe_register_info = NULL;
 740         struct acpi_gpe_event_info *gpe_event_info = NULL;
 741         struct acpi_gpe_event_info *this_event;
 742         struct acpi_gpe_register_info *this_register;
 743         acpi_native_uint i;
 744         acpi_native_uint j;
 745         acpi_status status;
 746
 747         ACPI_FUNCTION_TRACE("ev_create_gpe_info_blocks");
 748
 749         /* Allocate the GPE register information block */
 750
 751         gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->
 752                                                  register_count *
 753                                                  sizeof(struct
 754                                                         acpi_gpe_register_info));
 755         if (!gpe_register_info) {
 756                 ACPI_ERROR((AE_INFO,
 757                             "Could not allocate the gpe_register_info table"));
 758                 return_ACPI_STATUS(AE_NO_MEMORY);
 759         }
 760
 761         /*
 762          * Allocate the GPE event_info block. There are eight distinct GPEs
 763          * per register. Initialization to zeros is sufficient.
 764          */
 765         gpe_event_info = ACPI_ALLOCATE_ZEROED(((acpi_size) gpe_block->
 766                                                register_count *
 767                                                ACPI_GPE_REGISTER_WIDTH) *
 768                                               sizeof(struct
 769                                                      acpi_gpe_event_info));
 770         if (!gpe_event_info) {
 771                 ACPI_ERROR((AE_INFO,
 772                             "Could not allocate the gpe_event_info table"));
 773                 status = AE_NO_MEMORY;
 774                 goto error_exit;
 775         }
 776
 777         /* Save the new Info arrays in the GPE block */
 778
 779         gpe_block->register_info = gpe_register_info;
 780         gpe_block->event_info = gpe_event_info;
 781
 782         /*
 783          * Initialize the GPE Register and Event structures. A goal of these
 784          * tables is to hide the fact that there are two separate GPE register sets
 785          * in a given GPE hardware block, the status registers occupy the first half,
 786          * and the enable registers occupy the second half.
 787          */
 788         this_register = gpe_register_info;
 789         this_event = gpe_event_info;
 790
 791         for (i = 0; i < gpe_block->register_count; i++) {
 792
 793                 /* Init the register_info for this GPE register (8 GPEs) */
 794
 795                 this_register->base_gpe_number =
 796                     (u8) (gpe_block->block_base_number +
 797                           (i * ACPI_GPE_REGISTER_WIDTH));
 798
 799                 ACPI_STORE_ADDRESS(this_register->status_address.address,
 800                                    (gpe_block->block_address.address + i));
 801
 802                 ACPI_STORE_ADDRESS(this_register->enable_address.address,
 803                                    (gpe_block->block_address.address
 804                                     + i + gpe_block->register_count));
 805
 806                 this_register->status_address.address_space_id =
 807                     gpe_block->block_address.address_space_id;
 808                 this_register->enable_address.address_space_id =
 809                     gpe_block->block_address.address_space_id;
 810                 this_register->status_address.register_bit_width =
 811                     ACPI_GPE_REGISTER_WIDTH;
 812                 this_register->enable_address.register_bit_width =
 813                     ACPI_GPE_REGISTER_WIDTH;
 814                 this_register->status_address.register_bit_offset =
 815                     ACPI_GPE_REGISTER_WIDTH;
 816                 this_register->enable_address.register_bit_offset =
 817                     ACPI_GPE_REGISTER_WIDTH;
 818
 819                 /* Init the event_info for each GPE within this register */
 820
 821                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 822                         this_event->register_bit = acpi_gbl_decode_to8bit[j];
 823                         this_event->register_info = this_register;
 824                         this_event++;
 825                 }
 826
 827                 /* Disable all GPEs within this register */
 828
 829                 status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, 0x00,
 830                                                  &this_register->
 831                                                  enable_address);
 832                 if (ACPI_FAILURE(status)) {
 833                         goto error_exit;
 834                 }
 835
 836                 /* Clear any pending GPE events within this register */
 837
 838                 status = acpi_hw_low_level_write(ACPI_GPE_REGISTER_WIDTH, 0xFF,
 839                                                  &this_register->
 840                                                  status_address);
 841                 if (ACPI_FAILURE(status)) {
 842                         goto error_exit;
 843                 }
 844
 845                 this_register++;
 846         }
 847
 848         return_ACPI_STATUS(AE_OK);
 849
 850       error_exit:
 851         if (gpe_register_info) {
 852                 ACPI_FREE(gpe_register_info);
 853         }
 854         if (gpe_event_info) {
 855                 ACPI_FREE(gpe_event_info);
 856         }
 857
 858         return_ACPI_STATUS(status);
 859 }
 860
 861 /*******************************************************************************
 862  *
 863  * FUNCTION:    acpi_ev_create_gpe_block
 864  *
 865  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 866  *              gpe_block_address   - Address and space_iD
 867  *              register_count      - Number of GPE register pairs in the block
 868  *              gpe_block_base_number - Starting GPE number for the block
 869  *              interrupt_number    - H/W interrupt for the block
 870  *              return_gpe_block    - Where the new block descriptor is returned
 871  *
 872  * RETURN:      Status
 873  *
 874  * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
 875  *              the block are disabled at exit.
 876  *              Note: Assumes namespace is locked.
 877  *
 878  ******************************************************************************/
 879
 880 acpi_status
 881 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
 882                          struct acpi_generic_address *gpe_block_address,
 883                          u32 register_count,
 884                          u8 gpe_block_base_number,
 885                          u32 interrupt_number,
 886                          struct acpi_gpe_block_info **return_gpe_block)
 887 {
 888         acpi_status status;
 889         struct acpi_gpe_block_info *gpe_block;
 890
 891         ACPI_FUNCTION_TRACE("ev_create_gpe_block");
 892
 893         if (!register_count) {
 894                 return_ACPI_STATUS(AE_OK);
 895         }
 896
 897         /* Allocate a new GPE block */
 898
 899         gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
 900         if (!gpe_block) {
 901                 return_ACPI_STATUS(AE_NO_MEMORY);
 902         }
 903
 904         /* Initialize the new GPE block */
 905
 906         gpe_block->node = gpe_device;
 907         gpe_block->register_count = register_count;
 908         gpe_block->block_base_number = gpe_block_base_number;
 909
 910         ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
 911                     sizeof(struct acpi_generic_address));
 912
 913         /*
 914          * Create the register_info and event_info sub-structures
 915          * Note: disables and clears all GPEs in the block
 916          */
 917         status = acpi_ev_create_gpe_info_blocks(gpe_block);
 918         if (ACPI_FAILURE(status)) {
 919                 ACPI_FREE(gpe_block);
 920                 return_ACPI_STATUS(status);
 921         }
 922
 923         /* Install the new block in the global lists */
 924
 925         status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
 926         if (ACPI_FAILURE(status)) {
 927                 ACPI_FREE(gpe_block);
 928                 return_ACPI_STATUS(status);
 929         }
 930
 931         /* Find all GPE methods (_Lxx, _Exx) for this block */
 932
 933         status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
 934                                         ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
 935                                         acpi_ev_save_method_info, gpe_block,
 936                                         NULL);
 937
 938         /* Return the new block */
 939
 940         if (return_gpe_block) {
 941                 (*return_gpe_block) = gpe_block;
 942         }
 943
 944         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 945                           "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
 946                           (u32) gpe_block->block_base_number,
 947                           (u32) (gpe_block->block_base_number +
 948                                  ((gpe_block->register_count *
 949                                    ACPI_GPE_REGISTER_WIDTH) - 1)),
 950                           gpe_device->name.ascii, gpe_block->register_count,
 951                           interrupt_number));
 952
 953         return_ACPI_STATUS(AE_OK);
 954 }
 955
 956 /*******************************************************************************
 957  *
 958  * FUNCTION:    acpi_ev_initialize_gpe_block
 959  *
 960  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 961  *              gpe_block           - Gpe Block info
 962  *
 963  * RETURN:      Status
 964  *
 965  * DESCRIPTION: Initialize and enable a GPE block. First find and run any
 966  *              _PRT methods associated with the block, then enable the
 967  *              appropriate GPEs.
 968  *              Note: Assumes namespace is locked.
 969  *
 970  ******************************************************************************/
 971
 972 acpi_status
 973 acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
 974                              struct acpi_gpe_block_info *gpe_block)
 975 {
 976         acpi_status status;
 977         struct acpi_gpe_event_info *gpe_event_info;
 978         struct acpi_gpe_walk_info gpe_info;
 979         u32 wake_gpe_count;
 980         u32 gpe_enabled_count;
 981         acpi_native_uint i;
 982         acpi_native_uint j;
 983
 984         ACPI_FUNCTION_TRACE("ev_initialize_gpe_block");
 985
 986         /* Ignore a null GPE block (e.g., if no GPE block 1 exists) */
 987
 988         if (!gpe_block) {
 989                 return_ACPI_STATUS(AE_OK);
 990         }
 991
 992         /*
 993          * Runtime option: Should wake GPEs be enabled at runtime?  The default
 994          * is no, they should only be enabled just as the machine goes to sleep.
 995          */
 996         if (acpi_gbl_leave_wake_gpes_disabled) {
 997                 /*
 998                  * Differentiate runtime vs wake GPEs, via the _PRW control methods.
 999                  * Each GPE that has one or more _PRWs that reference it is by
1000                  * definition a wake GPE and will not be enabled while the machine
1001                  * is running.
1002                  */
1003                 gpe_info.gpe_block = gpe_block;
1004                 gpe_info.gpe_device = gpe_device;
1005
1006                 status =
1007                     acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1008                                            ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
1009                                            acpi_ev_match_prw_and_gpe, &gpe_info,
1010                                            NULL);
1011         }
1012
1013         /*
1014          * Enable all GPEs in this block that have these attributes:
1015          * 1) are "runtime" or "run/wake" GPEs, and
1016          * 2) have a corresponding _Lxx or _Exx method
1017          *
1018          * Any other GPEs within this block must be enabled via the acpi_enable_gpe()
1019          * external interface.
1020          */
1021         wake_gpe_count = 0;
1022         gpe_enabled_count = 0;
1023
1024         for (i = 0; i < gpe_block->register_count; i++) {
1025                 for (j = 0; j < 8; j++) {
1026
1027                         /* Get the info block for this particular GPE */
1028
1029                         gpe_event_info =
1030                             &gpe_block->
1031                             event_info[(i * ACPI_GPE_REGISTER_WIDTH) + j];
1032
1033                         if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
1034                              ACPI_GPE_DISPATCH_METHOD)
1035                             && (gpe_event_info->
1036                                 flags & ACPI_GPE_TYPE_RUNTIME)) {
1037                                 gpe_enabled_count++;
1038                         }
1039
1040                         if (gpe_event_info->flags & ACPI_GPE_TYPE_WAKE) {
1041                                 wake_gpe_count++;
1042                         }
1043                 }
1044         }
1045
1046         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1047                           "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
1048                           wake_gpe_count, gpe_enabled_count));
1049
1050         /* Enable all valid runtime GPEs found above */
1051
1052         status = acpi_hw_enable_runtime_gpe_block(NULL, gpe_block);
1053         if (ACPI_FAILURE(status)) {
1054                 ACPI_ERROR((AE_INFO, "Could not enable GPEs in gpe_block %p",
1055                             gpe_block));
1056         }
1057
1058         return_ACPI_STATUS(status);
1059 }
1060
1061 /*******************************************************************************
1062  *
1063  * FUNCTION:    acpi_ev_gpe_initialize
1064  *
1065  * PARAMETERS:  None
1066  *
1067  * RETURN:      Status
1068  *
1069  * DESCRIPTION: Initialize the GPE data structures
1070  *
1071  ******************************************************************************/
1072
1073 acpi_status acpi_ev_gpe_initialize(void)
1074 {
1075         u32 register_count0 = 0;
1076         u32 register_count1 = 0;
1077         u32 gpe_number_max = 0;
1078         acpi_status status;
1079
1080         ACPI_FUNCTION_TRACE("ev_gpe_initialize");
1081
1082         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
1083         if (ACPI_FAILURE(status)) {
1084                 return_ACPI_STATUS(status);
1085         }
1086
1087         /*
1088          * Initialize the GPE Block(s) defined in the FADT
1089          *
1090          * Why the GPE register block lengths are divided by 2:  From the ACPI Spec,
1091          * section "General-Purpose Event Registers", we have:
1092          *
1093          * "Each register block contains two registers of equal length
1094          *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
1095          *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
1096          *  The length of the GPE1_STS and GPE1_EN registers is equal to
1097          *  half the GPE1_LEN. If a generic register block is not supported
1098          *  then its respective block pointer and block length values in the
1099          *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
1100          *  to be the same size."
1101          */
1102
1103         /*
1104          * Determine the maximum GPE number for this machine.
1105          *
1106          * Note: both GPE0 and GPE1 are optional, and either can exist without
1107          * the other.
1108          *
1109          * If EITHER the register length OR the block address are zero, then that
1110          * particular block is not supported.
1111          */
1112         if (acpi_gbl_FADT->gpe0_blk_len && acpi_gbl_FADT->xgpe0_blk.address) {
1113
1114                 /* GPE block 0 exists (has both length and address > 0) */
1115
1116                 register_count0 = (u16) (acpi_gbl_FADT->gpe0_blk_len / 2);
1117
1118                 gpe_number_max =
1119                     (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
1120
1121                 /* Install GPE Block 0 */
1122
1123                 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1124                                                   &acpi_gbl_FADT->xgpe0_blk,
1125                                                   register_count0, 0,
1126                                                   acpi_gbl_FADT->sci_int,
1127                                                   &acpi_gbl_gpe_fadt_blocks[0]);
1128
1129                 if (ACPI_FAILURE(status)) {
1130                         ACPI_EXCEPTION((AE_INFO, status,
1131                                         "Could not create GPE Block 0"));
1132                 }
1133         }
1134
1135         if (acpi_gbl_FADT->gpe1_blk_len && acpi_gbl_FADT->xgpe1_blk.address) {
1136
1137                 /* GPE block 1 exists (has both length and address > 0) */
1138
1139                 register_count1 = (u16) (acpi_gbl_FADT->gpe1_blk_len / 2);
1140
1141                 /* Check for GPE0/GPE1 overlap (if both banks exist) */
1142
1143                 if ((register_count0) &&
1144                     (gpe_number_max >= acpi_gbl_FADT->gpe1_base)) {
1145                         ACPI_ERROR((AE_INFO,
1146                                     "GPE0 block (GPE 0 to %d) overlaps the GPE1 block (GPE %d to %d) - Ignoring GPE1",
1147                                     gpe_number_max, acpi_gbl_FADT->gpe1_base,
1148                                     acpi_gbl_FADT->gpe1_base +
1149                                     ((register_count1 *
1150                                       ACPI_GPE_REGISTER_WIDTH) - 1)));
1151
1152                         /* Ignore GPE1 block by setting the register count to zero */
1153
1154                         register_count1 = 0;
1155                 } else {
1156                         /* Install GPE Block 1 */
1157
1158                         status =
1159                             acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1160                                                      &acpi_gbl_FADT->xgpe1_blk,
1161                                                      register_count1,
1162                                                      acpi_gbl_FADT->gpe1_base,
1163                                                      acpi_gbl_FADT->sci_int,
1164                                                      &acpi_gbl_gpe_fadt_blocks
1165                                                      [1]);
1166
1167                         if (ACPI_FAILURE(status)) {
1168                                 ACPI_EXCEPTION((AE_INFO, status,
1169                                                 "Could not create GPE Block 1"));
1170                         }
1171
1172                         /*
1173                          * GPE0 and GPE1 do not have to be contiguous in the GPE number
1174                          * space. However, GPE0 always starts at GPE number zero.
1175                          */
1176                         gpe_number_max = acpi_gbl_FADT->gpe1_base +
1177                             ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
1178                 }
1179         }
1180
1181         /* Exit if there are no GPE registers */
1182
1183         if ((register_count0 + register_count1) == 0) {
1184
1185                 /* GPEs are not required by ACPI, this is OK */
1186
1187                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1188                                   "There are no GPE blocks defined in the FADT\n"));
1189                 status = AE_OK;
1190                 goto cleanup;
1191         }
1192
1193         /* Check for Max GPE number out-of-range */
1194
1195         if (gpe_number_max > ACPI_GPE_MAX) {
1196                 ACPI_ERROR((AE_INFO,
1197                             "Maximum GPE number from FADT is too large: 0x%X",
1198                             gpe_number_max));
1199                 status = AE_BAD_VALUE;
1200                 goto cleanup;
1201         }
1202
1203       cleanup:
1204         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
1205         return_ACPI_STATUS(AE_OK);
1206 }