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

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeblk - GPE block creation and initialization.
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acevents.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evgpeblk")
  51
  52 /* Local prototypes */
  53 static acpi_status
  54 acpi_ev_save_method_info(acpi_handle obj_handle,
  55                          u32 level, void *obj_desc, void **return_value);
  56
  57 static acpi_status
  58 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
  59                           u32 level, void *info, void **return_value);
  60
  61 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
  62                                                                interrupt_number);
  63
  64 static acpi_status
  65 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt);
  66
  67 static acpi_status
  68 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
  69                           u32 interrupt_number);
  70
  71 static acpi_status
  72 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block);
  73
  74 /*******************************************************************************
  75  *
  76  * FUNCTION:    acpi_ev_valid_gpe_event
  77  *
  78  * PARAMETERS:  gpe_event_info              - Info for this GPE
  79  *
  80  * RETURN:      TRUE if the gpe_event is valid
  81  *
  82  * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
  83  *              Should be called only when the GPE lists are semaphore locked
  84  *              and not subject to change.
  85  *
  86  ******************************************************************************/
  87
  88 u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
  89 {
  90         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
  91         struct acpi_gpe_block_info *gpe_block;
  92
  93         ACPI_FUNCTION_ENTRY();
  94
  95         /* No need for spin lock since we are not changing any list elements */
  96
  97         /* Walk the GPE interrupt levels */
  98
  99         gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
 100         while (gpe_xrupt_block) {
 101                 gpe_block = gpe_xrupt_block->gpe_block_list_head;
 102
 103                 /* Walk the GPE blocks on this interrupt level */
 104
 105                 while (gpe_block) {
 106                         if ((&gpe_block->event_info[0] <= gpe_event_info) &&
 107                             (&gpe_block->event_info[((acpi_size)
 108                                                      gpe_block->
 109                                                      register_count) * 8] >
 110                              gpe_event_info)) {
 111                                 return (TRUE);
 112                         }
 113
 114                         gpe_block = gpe_block->next;
 115                 }
 116
 117                 gpe_xrupt_block = gpe_xrupt_block->next;
 118         }
 119
 120         return (FALSE);
 121 }
 122
 123 /*******************************************************************************
 124  *
 125  * FUNCTION:    acpi_ev_walk_gpe_list
 126  *
 127  * PARAMETERS:  gpe_walk_callback   - Routine called for each GPE block
 128  *              Context             - Value passed to callback
 129  *
 130  * RETURN:      Status
 131  *
 132  * DESCRIPTION: Walk the GPE lists.
 133  *
 134  ******************************************************************************/
 135
 136 acpi_status
 137 acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
 138 {
 139         struct acpi_gpe_block_info *gpe_block;
 140         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
 141         acpi_status status = AE_OK;
 142         acpi_cpu_flags flags;
 143
 144         ACPI_FUNCTION_TRACE(ev_walk_gpe_list);
 145
 146         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 147
 148         /* Walk the interrupt level descriptor list */
 149
 150         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
 151         while (gpe_xrupt_info) {
 152
 153                 /* Walk all Gpe Blocks attached to this interrupt level */
 154
 155                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
 156                 while (gpe_block) {
 157
 158                         /* One callback per GPE block */
 159
 160                         status =
 161                             gpe_walk_callback(gpe_xrupt_info, gpe_block,
 162                                               context);
 163                         if (ACPI_FAILURE(status)) {
 164                                 if (status == AE_CTRL_END) {    /* Callback abort */
 165                                         status = AE_OK;
 166                                 }
 167                                 goto unlock_and_exit;
 168                         }
 169
 170                         gpe_block = gpe_block->next;
 171                 }
 172
 173                 gpe_xrupt_info = gpe_xrupt_info->next;
 174         }
 175
 176       unlock_and_exit:
 177         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 178         return_ACPI_STATUS(status);
 179 }
 180
 181 /*******************************************************************************
 182  *
 183  * FUNCTION:    acpi_ev_delete_gpe_handlers
 184  *
 185  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 186  *              gpe_block           - Gpe Block info
 187  *
 188  * RETURN:      Status
 189  *
 190  * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
 191  *              Used only prior to termination.
 192  *
 193  ******************************************************************************/
 194
 195 acpi_status
 196 acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 197                             struct acpi_gpe_block_info *gpe_block,
 198                             void *context)
 199 {
 200         struct acpi_gpe_event_info *gpe_event_info;
 201         u32 i;
 202         u32 j;
 203
 204         ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);
 205
 206         /* Examine each GPE Register within the block */
 207
 208         for (i = 0; i < gpe_block->register_count; i++) {
 209
 210                 /* Now look at the individual GPEs in this byte register */
 211
 212                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 213                         gpe_event_info = &gpe_block->event_info[((acpi_size) i *
 214                                                                  ACPI_GPE_REGISTER_WIDTH)
 215                                                                 + j];
 216
 217                         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 218                             ACPI_GPE_DISPATCH_HANDLER) {
 219                                 ACPI_FREE(gpe_event_info->dispatch.handler);
 220                                 gpe_event_info->dispatch.handler = NULL;
 221                                 gpe_event_info->flags &=
 222                                     ~ACPI_GPE_DISPATCH_MASK;
 223                         }
 224                 }
 225         }
 226
 227         return_ACPI_STATUS(AE_OK);
 228 }
 229
 230 /*******************************************************************************
 231  *
 232  * FUNCTION:    acpi_ev_save_method_info
 233  *
 234  * PARAMETERS:  Callback from walk_namespace
 235  *
 236  * RETURN:      Status
 237  *
 238  * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
 239  *              control method under the _GPE portion of the namespace.
 240  *              Extract the name and GPE type from the object, saving this
 241  *              information for quick lookup during GPE dispatch
 242  *
 243  *              The name of each GPE control method is of the form:
 244  *              "_Lxx" or "_Exx"
 245  *              Where:
 246  *                  L      - means that the GPE is level triggered
 247  *                  E      - means that the GPE is edge triggered
 248  *                  xx     - is the GPE number [in HEX]
 249  *
 250  ******************************************************************************/
 251
 252 static acpi_status
 253 acpi_ev_save_method_info(acpi_handle obj_handle,
 254                          u32 level, void *obj_desc, void **return_value)
 255 {
 256         struct acpi_gpe_block_info *gpe_block = (void *)obj_desc;
 257         struct acpi_gpe_event_info *gpe_event_info;
 258         u32 gpe_number;
 259         char name[ACPI_NAME_SIZE + 1];
 260         u8 type;
 261         acpi_status status;
 262
 263         ACPI_FUNCTION_TRACE(ev_save_method_info);
 264
 265         /*
 266          * _Lxx and _Exx GPE method support
 267          *
 268          * 1) Extract the name from the object and convert to a string
 269          */
 270         ACPI_MOVE_32_TO_32(name,
 271                            &((struct acpi_namespace_node *)obj_handle)->name.
 272                            integer);
 273         name[ACPI_NAME_SIZE] = 0;
 274
 275         /*
 276          * 2) Edge/Level determination is based on the 2nd character
 277          *    of the method name
 278          *
 279          * NOTE: Default GPE type is RUNTIME. May be changed later to WAKE
 280          * if a _PRW object is found that points to this GPE.
 281          */
 282         switch (name[1]) {
 283         case 'L':
 284                 type = ACPI_GPE_LEVEL_TRIGGERED;
 285                 break;
 286
 287         case 'E':
 288                 type = ACPI_GPE_EDGE_TRIGGERED;
 289                 break;
 290
 291         default:
 292                 /* Unknown method type, just ignore it! */
 293
 294                 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 295                                   "Ignoring unknown GPE method type: %s "
 296                                   "(name not of form _Lxx or _Exx)", name));
 297                 return_ACPI_STATUS(AE_OK);
 298         }
 299
 300         /* Convert the last two characters of the name to the GPE Number */
 301
 302         gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
 303         if (gpe_number == ACPI_UINT32_MAX) {
 304
 305                 /* Conversion failed; invalid method, just ignore it */
 306
 307                 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 308                                   "Could not extract GPE number from name: %s "
 309                                   "(name is not of form _Lxx or _Exx)", name));
 310                 return_ACPI_STATUS(AE_OK);
 311         }
 312
 313         /* Ensure that we have a valid GPE number for this GPE block */
 314
 315         if ((gpe_number < gpe_block->block_base_number) ||
 316             (gpe_number >= (gpe_block->block_base_number +
 317                             (gpe_block->register_count * 8)))) {
 318                 /*
 319                  * Not valid for this GPE block, just ignore it. However, it may be
 320                  * valid for a different GPE block, since GPE0 and GPE1 methods both
 321                  * appear under \_GPE.
 322                  */
 323                 return_ACPI_STATUS(AE_OK);
 324         }
 325
 326         /*
 327          * Now we can add this information to the gpe_event_info block for use
 328          * during dispatch of this GPE. Default type is RUNTIME, although this may
 329          * change when the _PRW methods are executed later.
 330          */
 331         gpe_event_info =
 332             &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
 333
 334         gpe_event_info->flags = (u8)
 335             (type | ACPI_GPE_DISPATCH_METHOD | ACPI_GPE_TYPE_RUNTIME);
 336
 337         gpe_event_info->dispatch.method_node =
 338             (struct acpi_namespace_node *)obj_handle;
 339
 340         /* Update enable mask, but don't enable the HW GPE as of yet */
 341
 342         status = acpi_ev_enable_gpe(gpe_event_info, FALSE);
 343
 344         ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 345                           "Registered GPE method %s as GPE number 0x%.2X\n",
 346                           name, gpe_number));
 347         return_ACPI_STATUS(status);
 348 }
 349
 350 /*******************************************************************************
 351  *
 352  * FUNCTION:    acpi_ev_match_prw_and_gpe
 353  *
 354  * PARAMETERS:  Callback from walk_namespace
 355  *
 356  * RETURN:      Status. NOTE: We ignore errors so that the _PRW walk is
 357  *              not aborted on a single _PRW failure.
 358  *
 359  * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
 360  *              Device. Run the _PRW method. If present, extract the GPE
 361  *              number and mark the GPE as a WAKE GPE.
 362  *
 363  ******************************************************************************/
 364
 365 static acpi_status
 366 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
 367                           u32 level, void *info, void **return_value)
 368 {
 369         struct acpi_gpe_walk_info *gpe_info = (void *)info;
 370         struct acpi_namespace_node *gpe_device;
 371         struct acpi_gpe_block_info *gpe_block;
 372         struct acpi_namespace_node *target_gpe_device;
 373         struct acpi_gpe_event_info *gpe_event_info;
 374         union acpi_operand_object *pkg_desc;
 375         union acpi_operand_object *obj_desc;
 376         u32 gpe_number;
 377         acpi_status status;
 378
 379         ACPI_FUNCTION_TRACE(ev_match_prw_and_gpe);
 380
 381         /* Check for a _PRW method under this device */
 382
 383         status = acpi_ut_evaluate_object(obj_handle, METHOD_NAME__PRW,
 384                                          ACPI_BTYPE_PACKAGE, &pkg_desc);
 385         if (ACPI_FAILURE(status)) {
 386
 387                 /* Ignore all errors from _PRW, we don't want to abort the subsystem */
 388
 389                 return_ACPI_STATUS(AE_OK);
 390         }
 391
 392         /* The returned _PRW package must have at least two elements */
 393
 394         if (pkg_desc->package.count < 2) {
 395                 goto cleanup;
 396         }
 397
 398         /* Extract pointers from the input context */
 399
 400         gpe_device = gpe_info->gpe_device;
 401         gpe_block = gpe_info->gpe_block;
 402
 403         /*
 404          * The _PRW object must return a package, we are only interested in the
 405          * first element
 406          */
 407         obj_desc = pkg_desc->package.elements[0];
 408
 409         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
 410
 411                 /* Use FADT-defined GPE device (from definition of _PRW) */
 412
 413                 target_gpe_device = acpi_gbl_fadt_gpe_device;
 414
 415                 /* Integer is the GPE number in the FADT described GPE blocks */
 416
 417                 gpe_number = (u32) obj_desc->integer.value;
 418         } else if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
 419
 420                 /* Package contains a GPE reference and GPE number within a GPE block */
 421
 422                 if ((obj_desc->package.count < 2) ||
 423                     ((obj_desc->package.elements[0])->common.type !=
 424                      ACPI_TYPE_LOCAL_REFERENCE) ||
 425                     ((obj_desc->package.elements[1])->common.type !=
 426                      ACPI_TYPE_INTEGER)) {
 427                         goto cleanup;
 428                 }
 429
 430                 /* Get GPE block reference and decode */
 431
 432                 target_gpe_device =
 433                     obj_desc->package.elements[0]->reference.node;
 434                 gpe_number = (u32) obj_desc->package.elements[1]->integer.value;
 435         } else {
 436                 /* Unknown type, just ignore it */
 437
 438                 goto cleanup;
 439         }
 440
 441         /*
 442          * Is this GPE within this block?
 443          *
 444          * TRUE if and only if these conditions are true:
 445          *     1) The GPE devices match.
 446          *     2) The GPE index(number) is within the range of the Gpe Block
 447          *          associated with the GPE device.
 448          */
 449         if ((gpe_device == target_gpe_device) &&
 450             (gpe_number >= gpe_block->block_base_number) &&
 451             (gpe_number < gpe_block->block_base_number +
 452              (gpe_block->register_count * 8))) {
 453                 gpe_event_info = &gpe_block->event_info[gpe_number -
 454                                                         gpe_block->
 455                                                         block_base_number];
 456
 457                 /* Mark GPE for WAKE-ONLY but WAKE_DISABLED */
 458
 459                 gpe_event_info->flags &=
 460                     ~(ACPI_GPE_WAKE_ENABLED | ACPI_GPE_RUN_ENABLED);
 461
 462                 status =
 463                     acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
 464                 if (ACPI_FAILURE(status)) {
 465                         goto cleanup;
 466                 }
 467
 468                 status =
 469                     acpi_ev_update_gpe_enable_masks(gpe_event_info,
 470                                                     ACPI_GPE_DISABLE);
 471         }
 472
 473       cleanup:
 474         acpi_ut_remove_reference(pkg_desc);
 475         return_ACPI_STATUS(AE_OK);
 476 }
 477
 478 /*******************************************************************************
 479  *
 480  * FUNCTION:    acpi_ev_get_gpe_xrupt_block
 481  *
 482  * PARAMETERS:  interrupt_number     - Interrupt for a GPE block
 483  *
 484  * RETURN:      A GPE interrupt block
 485  *
 486  * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
 487  *              block per unique interrupt level used for GPEs. Should be
 488  *              called only when the GPE lists are semaphore locked and not
 489  *              subject to change.
 490  *
 491  ******************************************************************************/
 492
 493 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
 494                                                                interrupt_number)
 495 {
 496         struct acpi_gpe_xrupt_info *next_gpe_xrupt;
 497         struct acpi_gpe_xrupt_info *gpe_xrupt;
 498         acpi_status status;
 499         acpi_cpu_flags flags;
 500
 501         ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
 502
 503         /* No need for lock since we are not changing any list elements here */
 504
 505         next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 506         while (next_gpe_xrupt) {
 507                 if (next_gpe_xrupt->interrupt_number == interrupt_number) {
 508                         return_PTR(next_gpe_xrupt);
 509                 }
 510
 511                 next_gpe_xrupt = next_gpe_xrupt->next;
 512         }
 513
 514         /* Not found, must allocate a new xrupt descriptor */
 515
 516         gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
 517         if (!gpe_xrupt) {
 518                 return_PTR(NULL);
 519         }
 520
 521         gpe_xrupt->interrupt_number = interrupt_number;
 522
 523         /* Install new interrupt descriptor with spin lock */
 524
 525         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 526         if (acpi_gbl_gpe_xrupt_list_head) {
 527                 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 528                 while (next_gpe_xrupt->next) {
 529                         next_gpe_xrupt = next_gpe_xrupt->next;
 530                 }
 531
 532                 next_gpe_xrupt->next = gpe_xrupt;
 533                 gpe_xrupt->previous = next_gpe_xrupt;
 534         } else {
 535                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
 536         }
 537         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 538
 539         /* Install new interrupt handler if not SCI_INT */
 540
 541         if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
 542                 status = acpi_os_install_interrupt_handler(interrupt_number,
 543                                                            acpi_ev_gpe_xrupt_handler,
 544                                                            gpe_xrupt);
 545                 if (ACPI_FAILURE(status)) {
 546                         ACPI_ERROR((AE_INFO,
 547                                     "Could not install GPE interrupt handler at level 0x%X",
 548                                     interrupt_number));
 549                         return_PTR(NULL);
 550                 }
 551         }
 552
 553         return_PTR(gpe_xrupt);
 554 }
 555
 556 /*******************************************************************************
 557  *
 558  * FUNCTION:    acpi_ev_delete_gpe_xrupt
 559  *
 560  * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block
 561  *
 562  * RETURN:      Status
 563  *
 564  * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
 565  *              interrupt handler if not the SCI interrupt.
 566  *
 567  ******************************************************************************/
 568
 569 static acpi_status
 570 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
 571 {
 572         acpi_status status;
 573         acpi_cpu_flags flags;
 574
 575         ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
 576
 577         /* We never want to remove the SCI interrupt handler */
 578
 579         if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
 580                 gpe_xrupt->gpe_block_list_head = NULL;
 581                 return_ACPI_STATUS(AE_OK);
 582         }
 583
 584         /* Disable this interrupt */
 585
 586         status =
 587             acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
 588                                              acpi_ev_gpe_xrupt_handler);
 589         if (ACPI_FAILURE(status)) {
 590                 return_ACPI_STATUS(status);
 591         }
 592
 593         /* Unlink the interrupt block with lock */
 594
 595         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 596         if (gpe_xrupt->previous) {
 597                 gpe_xrupt->previous->next = gpe_xrupt->next;
 598         } else {
 599                 /* No previous, update list head */
 600
 601                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
 602         }
 603
 604         if (gpe_xrupt->next) {
 605                 gpe_xrupt->next->previous = gpe_xrupt->previous;
 606         }
 607         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 608
 609         /* Free the block */
 610
 611         ACPI_FREE(gpe_xrupt);
 612         return_ACPI_STATUS(AE_OK);
 613 }
 614
 615 /*******************************************************************************
 616  *
 617  * FUNCTION:    acpi_ev_install_gpe_block
 618  *
 619  * PARAMETERS:  gpe_block               - New GPE block
 620  *              interrupt_number        - Xrupt to be associated with this
 621  *                                        GPE block
 622  *
 623  * RETURN:      Status
 624  *
 625  * DESCRIPTION: Install new GPE block with mutex support
 626  *
 627  ******************************************************************************/
 628
 629 static acpi_status
 630 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
 631                           u32 interrupt_number)
 632 {
 633         struct acpi_gpe_block_info *next_gpe_block;
 634         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
 635         acpi_status status;
 636         acpi_cpu_flags flags;
 637
 638         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
 639
 640         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 641         if (ACPI_FAILURE(status)) {
 642                 return_ACPI_STATUS(status);
 643         }
 644
 645         gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block(interrupt_number);
 646         if (!gpe_xrupt_block) {
 647                 status = AE_NO_MEMORY;
 648                 goto unlock_and_exit;
 649         }
 650
 651         /* Install the new block at the end of the list with lock */
 652
 653         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 654         if (gpe_xrupt_block->gpe_block_list_head) {
 655                 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
 656                 while (next_gpe_block->next) {
 657                         next_gpe_block = next_gpe_block->next;
 658                 }
 659
 660                 next_gpe_block->next = gpe_block;
 661                 gpe_block->previous = next_gpe_block;
 662         } else {
 663                 gpe_xrupt_block->gpe_block_list_head = gpe_block;
 664         }
 665
 666         gpe_block->xrupt_block = gpe_xrupt_block;
 667         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 668
 669       unlock_and_exit:
 670         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 671         return_ACPI_STATUS(status);
 672 }
 673
 674 /*******************************************************************************
 675  *
 676  * FUNCTION:    acpi_ev_delete_gpe_block
 677  *
 678  * PARAMETERS:  gpe_block           - Existing GPE block
 679  *
 680  * RETURN:      Status
 681  *
 682  * DESCRIPTION: Remove a GPE block
 683  *
 684  ******************************************************************************/
 685
 686 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
 687 {
 688         acpi_status status;
 689         acpi_cpu_flags flags;
 690
 691         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
 692
 693         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 694         if (ACPI_FAILURE(status)) {
 695                 return_ACPI_STATUS(status);
 696         }
 697
 698         /* Disable all GPEs in this block */
 699
 700         status =
 701             acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block, NULL);
 702
 703         if (!gpe_block->previous && !gpe_block->next) {
 704
 705                 /* This is the last gpe_block on this interrupt */
 706
 707                 status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
 708                 if (ACPI_FAILURE(status)) {
 709                         goto unlock_and_exit;
 710                 }
 711         } else {
 712                 /* Remove the block on this interrupt with lock */
 713
 714                 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 715                 if (gpe_block->previous) {
 716                         gpe_block->previous->next = gpe_block->next;
 717                 } else {
 718                         gpe_block->xrupt_block->gpe_block_list_head =
 719                             gpe_block->next;
 720                 }
 721
 722                 if (gpe_block->next) {
 723                         gpe_block->next->previous = gpe_block->previous;
 724                 }
 725                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 726         }
 727
 728         acpi_current_gpe_count -=
 729             gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH;
 730
 731         /* Free the gpe_block */
 732
 733         ACPI_FREE(gpe_block->register_info);
 734         ACPI_FREE(gpe_block->event_info);
 735         ACPI_FREE(gpe_block);
 736
 737       unlock_and_exit:
 738         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 739         return_ACPI_STATUS(status);
 740 }
 741
 742 /*******************************************************************************
 743  *
 744  * FUNCTION:    acpi_ev_create_gpe_info_blocks
 745  *
 746  * PARAMETERS:  gpe_block   - New GPE block
 747  *
 748  * RETURN:      Status
 749  *
 750  * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
 751  *
 752  ******************************************************************************/
 753
 754 static acpi_status
 755 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
 756 {
 757         struct acpi_gpe_register_info *gpe_register_info = NULL;
 758         struct acpi_gpe_event_info *gpe_event_info = NULL;
 759         struct acpi_gpe_event_info *this_event;
 760         struct acpi_gpe_register_info *this_register;
 761         u32 i;
 762         u32 j;
 763         acpi_status status;
 764
 765         ACPI_FUNCTION_TRACE(ev_create_gpe_info_blocks);
 766
 767         /* Allocate the GPE register information block */
 768
 769         gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->
 770                                                  register_count *
 771                                                  sizeof(struct
 772                                                         acpi_gpe_register_info));
 773         if (!gpe_register_info) {
 774                 ACPI_ERROR((AE_INFO,
 775                             "Could not allocate the GpeRegisterInfo table"));
 776                 return_ACPI_STATUS(AE_NO_MEMORY);
 777         }
 778
 779         /*
 780          * Allocate the GPE event_info block. There are eight distinct GPEs
 781          * per register. Initialization to zeros is sufficient.
 782          */
 783         gpe_event_info = ACPI_ALLOCATE_ZEROED(((acpi_size) gpe_block->
 784                                                register_count *
 785                                                ACPI_GPE_REGISTER_WIDTH) *
 786                                               sizeof(struct
 787                                                      acpi_gpe_event_info));
 788         if (!gpe_event_info) {
 789                 ACPI_ERROR((AE_INFO,
 790                             "Could not allocate the GpeEventInfo table"));
 791                 status = AE_NO_MEMORY;
 792                 goto error_exit;
 793         }
 794
 795         /* Save the new Info arrays in the GPE block */
 796
 797         gpe_block->register_info = gpe_register_info;
 798         gpe_block->event_info = gpe_event_info;
 799
 800         /*
 801          * Initialize the GPE Register and Event structures. A goal of these
 802          * tables is to hide the fact that there are two separate GPE register
 803          * sets in a given GPE hardware block, the status registers occupy the
 804          * first half, and the enable registers occupy the second half.
 805          */
 806         this_register = gpe_register_info;
 807         this_event = gpe_event_info;
 808
 809         for (i = 0; i < gpe_block->register_count; i++) {
 810
 811                 /* Init the register_info for this GPE register (8 GPEs) */
 812
 813                 this_register->base_gpe_number =
 814                     (u8) (gpe_block->block_base_number +
 815                           (i * ACPI_GPE_REGISTER_WIDTH));
 816
 817                 this_register->status_address.address =
 818                     gpe_block->block_address.address + i;
 819
 820                 this_register->enable_address.address =
 821                     gpe_block->block_address.address + i +
 822                     gpe_block->register_count;
 823
 824                 this_register->status_address.space_id =
 825                     gpe_block->block_address.space_id;
 826                 this_register->enable_address.space_id =
 827                     gpe_block->block_address.space_id;
 828                 this_register->status_address.bit_width =
 829                     ACPI_GPE_REGISTER_WIDTH;
 830                 this_register->enable_address.bit_width =
 831                     ACPI_GPE_REGISTER_WIDTH;
 832                 this_register->status_address.bit_offset = 0;
 833                 this_register->enable_address.bit_offset = 0;
 834
 835                 /* Init the event_info for each GPE within this register */
 836
 837                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 838                         this_event->gpe_number =
 839                             (u8) (this_register->base_gpe_number + j);
 840                         this_event->register_info = this_register;
 841                         this_event++;
 842                 }
 843
 844                 /* Disable all GPEs within this register */
 845
 846                 status = acpi_write(0x00, &this_register->enable_address);
 847                 if (ACPI_FAILURE(status)) {
 848                         goto error_exit;
 849                 }
 850
 851                 /* Clear any pending GPE events within this register */
 852
 853                 status = acpi_write(0xFF, &this_register->status_address);
 854                 if (ACPI_FAILURE(status)) {
 855                         goto error_exit;
 856                 }
 857
 858                 this_register++;
 859         }
 860
 861         return_ACPI_STATUS(AE_OK);
 862
 863       error_exit:
 864         if (gpe_register_info) {
 865                 ACPI_FREE(gpe_register_info);
 866         }
 867         if (gpe_event_info) {
 868                 ACPI_FREE(gpe_event_info);
 869         }
 870
 871         return_ACPI_STATUS(status);
 872 }
 873
 874 /*******************************************************************************
 875  *
 876  * FUNCTION:    acpi_ev_create_gpe_block
 877  *
 878  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 879  *              gpe_block_address   - Address and space_iD
 880  *              register_count      - Number of GPE register pairs in the block
 881  *              gpe_block_base_number - Starting GPE number for the block
 882  *              interrupt_number    - H/W interrupt for the block
 883  *              return_gpe_block    - Where the new block descriptor is returned
 884  *
 885  * RETURN:      Status
 886  *
 887  * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
 888  *              the block are disabled at exit.
 889  *              Note: Assumes namespace is locked.
 890  *
 891  ******************************************************************************/
 892
 893 acpi_status
 894 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
 895                          struct acpi_generic_address *gpe_block_address,
 896                          u32 register_count,
 897                          u8 gpe_block_base_number,
 898                          u32 interrupt_number,
 899                          struct acpi_gpe_block_info **return_gpe_block)
 900 {
 901         acpi_status status;
 902         struct acpi_gpe_block_info *gpe_block;
 903
 904         ACPI_FUNCTION_TRACE(ev_create_gpe_block);
 905
 906         if (!register_count) {
 907                 return_ACPI_STATUS(AE_OK);
 908         }
 909
 910         /* Allocate a new GPE block */
 911
 912         gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
 913         if (!gpe_block) {
 914                 return_ACPI_STATUS(AE_NO_MEMORY);
 915         }
 916
 917         /* Initialize the new GPE block */
 918
 919         gpe_block->node = gpe_device;
 920         gpe_block->register_count = register_count;
 921         gpe_block->block_base_number = gpe_block_base_number;
 922
 923         ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
 924                     sizeof(struct acpi_generic_address));
 925
 926         /*
 927          * Create the register_info and event_info sub-structures
 928          * Note: disables and clears all GPEs in the block
 929          */
 930         status = acpi_ev_create_gpe_info_blocks(gpe_block);
 931         if (ACPI_FAILURE(status)) {
 932                 ACPI_FREE(gpe_block);
 933                 return_ACPI_STATUS(status);
 934         }
 935
 936         /* Install the new block in the global lists */
 937
 938         status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
 939         if (ACPI_FAILURE(status)) {
 940                 ACPI_FREE(gpe_block);
 941                 return_ACPI_STATUS(status);
 942         }
 943
 944         /* Find all GPE methods (_Lxx, _Exx) for this block */
 945
 946         status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
 947                                         ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
 948                                         acpi_ev_save_method_info, gpe_block,
 949                                         NULL);
 950
 951         /* Return the new block */
 952
 953         if (return_gpe_block) {
 954                 (*return_gpe_block) = gpe_block;
 955         }
 956
 957         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
 958                           "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
 959                           (u32) gpe_block->block_base_number,
 960                           (u32) (gpe_block->block_base_number +
 961                                  ((gpe_block->register_count *
 962                                    ACPI_GPE_REGISTER_WIDTH) - 1)),
 963                           gpe_device->name.ascii, gpe_block->register_count,
 964                           interrupt_number));
 965
 966         /* Update global count of currently available GPEs */
 967
 968         acpi_current_gpe_count += register_count * ACPI_GPE_REGISTER_WIDTH;
 969         return_ACPI_STATUS(AE_OK);
 970 }
 971
 972 /*******************************************************************************
 973  *
 974  * FUNCTION:    acpi_ev_initialize_gpe_block
 975  *
 976  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
 977  *              gpe_block           - Gpe Block info
 978  *
 979  * RETURN:      Status
 980  *
 981  * DESCRIPTION: Initialize and enable a GPE block. First find and run any
 982  *              _PRT methods associated with the block, then enable the
 983  *              appropriate GPEs.
 984  *              Note: Assumes namespace is locked.
 985  *
 986  ******************************************************************************/
 987
 988 acpi_status
 989 acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
 990                              struct acpi_gpe_block_info *gpe_block)
 991 {
 992         acpi_status status;
 993         struct acpi_gpe_event_info *gpe_event_info;
 994         struct acpi_gpe_walk_info gpe_info;
 995         u32 wake_gpe_count;
 996         u32 gpe_enabled_count;
 997         u32 i;
 998         u32 j;
 999
1000         ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);
1001
1002         /* Ignore a null GPE block (e.g., if no GPE block 1 exists) */
1003
1004         if (!gpe_block) {
1005                 return_ACPI_STATUS(AE_OK);
1006         }
1007
1008         /*
1009          * Runtime option: Should wake GPEs be enabled at runtime?  The default
1010          * is no, they should only be enabled just as the machine goes to sleep.
1011          */
1012         if (acpi_gbl_leave_wake_gpes_disabled) {
1013                 /*
1014                  * Differentiate runtime vs wake GPEs, via the _PRW control methods.
1015                  * Each GPE that has one or more _PRWs that reference it is by
1016                  * definition a wake GPE and will not be enabled while the machine
1017                  * is running.
1018                  */
1019                 gpe_info.gpe_block = gpe_block;
1020                 gpe_info.gpe_device = gpe_device;
1021
1022                 status =
1023                     acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1024                                            ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
1025                                            acpi_ev_match_prw_and_gpe, &gpe_info,
1026                                            NULL);
1027         }
1028
1029         /*
1030          * Enable all GPEs in this block that have these attributes:
1031          * 1) are "runtime" or "run/wake" GPEs, and
1032          * 2) have a corresponding _Lxx or _Exx method
1033          *
1034          * Any other GPEs within this block must be enabled via the
1035          * acpi_enable_gpe() external interface.
1036          */
1037         wake_gpe_count = 0;
1038         gpe_enabled_count = 0;
1039
1040         for (i = 0; i < gpe_block->register_count; i++) {
1041                 for (j = 0; j < 8; j++) {
1042
1043                         /* Get the info block for this particular GPE */
1044
1045                         gpe_event_info = &gpe_block->event_info[((acpi_size) i *
1046                                                                  ACPI_GPE_REGISTER_WIDTH)
1047                                                                 + j];
1048
1049                         if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
1050                              ACPI_GPE_DISPATCH_METHOD) &&
1051                             (gpe_event_info->flags & ACPI_GPE_TYPE_RUNTIME)) {
1052                                 gpe_enabled_count++;
1053                         }
1054
1055                         if (gpe_event_info->flags & ACPI_GPE_TYPE_WAKE) {
1056                                 wake_gpe_count++;
1057                         }
1058                 }
1059         }
1060
1061         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1062                           "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
1063                           wake_gpe_count, gpe_enabled_count));
1064
1065         /* Enable all valid runtime GPEs found above */
1066
1067         status = acpi_hw_enable_runtime_gpe_block(NULL, gpe_block, NULL);
1068         if (ACPI_FAILURE(status)) {
1069                 ACPI_ERROR((AE_INFO, "Could not enable GPEs in GpeBlock %p",
1070                             gpe_block));
1071         }
1072
1073         return_ACPI_STATUS(status);
1074 }
1075
1076 /*******************************************************************************
1077  *
1078  * FUNCTION:    acpi_ev_gpe_initialize
1079  *
1080  * PARAMETERS:  None
1081  *
1082  * RETURN:      Status
1083  *
1084  * DESCRIPTION: Initialize the GPE data structures
1085  *
1086  ******************************************************************************/
1087
1088 acpi_status acpi_ev_gpe_initialize(void)
1089 {
1090         u32 register_count0 = 0;
1091         u32 register_count1 = 0;
1092         u32 gpe_number_max = 0;
1093         acpi_status status;
1094
1095         ACPI_FUNCTION_TRACE(ev_gpe_initialize);
1096
1097         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
1098         if (ACPI_FAILURE(status)) {
1099                 return_ACPI_STATUS(status);
1100         }
1101
1102         /*
1103          * Initialize the GPE Block(s) defined in the FADT
1104          *
1105          * Why the GPE register block lengths are divided by 2:  From the ACPI
1106          * Spec, section "General-Purpose Event Registers", we have:
1107          *
1108          * "Each register block contains two registers of equal length
1109          *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
1110          *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
1111          *  The length of the GPE1_STS and GPE1_EN registers is equal to
1112          *  half the GPE1_LEN. If a generic register block is not supported
1113          *  then its respective block pointer and block length values in the
1114          *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
1115          *  to be the same size."
1116          */
1117
1118         /*
1119          * Determine the maximum GPE number for this machine.
1120          *
1121          * Note: both GPE0 and GPE1 are optional, and either can exist without
1122          * the other.
1123          *
1124          * If EITHER the register length OR the block address are zero, then that
1125          * particular block is not supported.
1126          */
1127         if (acpi_gbl_FADT.gpe0_block_length &&
1128             acpi_gbl_FADT.xgpe0_block.address) {
1129
1130                 /* GPE block 0 exists (has both length and address > 0) */
1131
1132                 register_count0 = (u16) (acpi_gbl_FADT.gpe0_block_length / 2);
1133
1134                 gpe_number_max =
1135                     (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
1136
1137                 /* Install GPE Block 0 */
1138
1139                 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1140                                                   &acpi_gbl_FADT.xgpe0_block,
1141                                                   register_count0, 0,
1142                                                   acpi_gbl_FADT.sci_interrupt,
1143                                                   &acpi_gbl_gpe_fadt_blocks[0]);
1144
1145                 if (ACPI_FAILURE(status)) {
1146                         ACPI_EXCEPTION((AE_INFO, status,
1147                                         "Could not create GPE Block 0"));
1148                 }
1149         }
1150
1151         if (acpi_gbl_FADT.gpe1_block_length &&
1152             acpi_gbl_FADT.xgpe1_block.address) {
1153
1154                 /* GPE block 1 exists (has both length and address > 0) */
1155
1156                 register_count1 = (u16) (acpi_gbl_FADT.gpe1_block_length / 2);
1157
1158                 /* Check for GPE0/GPE1 overlap (if both banks exist) */
1159
1160                 if ((register_count0) &&
1161                     (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
1162                         ACPI_ERROR((AE_INFO,
1163                                     "GPE0 block (GPE 0 to %d) overlaps the GPE1 block "
1164                                     "(GPE %d to %d) - Ignoring GPE1",
1165                                     gpe_number_max, acpi_gbl_FADT.gpe1_base,
1166                                     acpi_gbl_FADT.gpe1_base +
1167                                     ((register_count1 *
1168                                       ACPI_GPE_REGISTER_WIDTH) - 1)));
1169
1170                         /* Ignore GPE1 block by setting the register count to zero */
1171
1172                         register_count1 = 0;
1173                 } else {
1174                         /* Install GPE Block 1 */
1175
1176                         status =
1177                             acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1178                                                      &acpi_gbl_FADT.xgpe1_block,
1179                                                      register_count1,
1180                                                      acpi_gbl_FADT.gpe1_base,
1181                                                      acpi_gbl_FADT.
1182                                                      sci_interrupt,
1183                                                      &acpi_gbl_gpe_fadt_blocks
1184                                                      [1]);
1185
1186                         if (ACPI_FAILURE(status)) {
1187                                 ACPI_EXCEPTION((AE_INFO, status,
1188                                                 "Could not create GPE Block 1"));
1189                         }
1190
1191                         /*
1192                          * GPE0 and GPE1 do not have to be contiguous in the GPE number
1193                          * space. However, GPE0 always starts at GPE number zero.
1194                          */
1195                         gpe_number_max = acpi_gbl_FADT.gpe1_base +
1196                             ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
1197                 }
1198         }
1199
1200         /* Exit if there are no GPE registers */
1201
1202         if ((register_count0 + register_count1) == 0) {
1203
1204                 /* GPEs are not required by ACPI, this is OK */
1205
1206                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1207                                   "There are no GPE blocks defined in the FADT\n"));
1208                 status = AE_OK;
1209                 goto cleanup;
1210         }
1211
1212         /* Check for Max GPE number out-of-range */
1213
1214         if (gpe_number_max > ACPI_GPE_MAX) {
1215                 ACPI_ERROR((AE_INFO,
1216                             "Maximum GPE number from FADT is too large: 0x%X",
1217                             gpe_number_max));
1218                 status = AE_BAD_VALUE;
1219                 goto cleanup;
1220         }
1221
1222       cleanup:
1223         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
1224         return_ACPI_STATUS(AE_OK);
1225 }