drivers/acpi/acpica/evgpeutil.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpeutil - GPE utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, 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
  48 #define _COMPONENT          ACPI_EVENTS
  49 ACPI_MODULE_NAME("evgpeutil")
  50
  51 #if (!ACPI_REDUCED_HARDWARE)    /* Entire module */
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_ev_walk_gpe_list
  55  *
  56  * PARAMETERS:  gpe_walk_callback   - Routine called for each GPE block
  57  *              Context             - Value passed to callback
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Walk the GPE lists.
  62  *
  63  ******************************************************************************/
  64 acpi_status
  65 acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
  66 {
  67         struct acpi_gpe_block_info *gpe_block;
  68         struct acpi_gpe_xrupt_info *gpe_xrupt_info;
  69         acpi_status status = AE_OK;
  70         acpi_cpu_flags flags;
  71
  72         ACPI_FUNCTION_TRACE(ev_walk_gpe_list);
  73
  74         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
  75
  76         /* Walk the interrupt level descriptor list */
  77
  78         gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
  79         while (gpe_xrupt_info) {
  80
  81                 /* Walk all Gpe Blocks attached to this interrupt level */
  82
  83                 gpe_block = gpe_xrupt_info->gpe_block_list_head;
  84                 while (gpe_block) {
  85
  86                         /* One callback per GPE block */
  87
  88                         status =
  89                             gpe_walk_callback(gpe_xrupt_info, gpe_block,
  90                                               context);
  91                         if (ACPI_FAILURE(status)) {
  92                                 if (status == AE_CTRL_END) {    /* Callback abort */
  93                                         status = AE_OK;
  94                                 }
  95                                 goto unlock_and_exit;
  96                         }
  97
  98                         gpe_block = gpe_block->next;
  99                 }
 100
 101                 gpe_xrupt_info = gpe_xrupt_info->next;
 102         }
 103
 104       unlock_and_exit:
 105         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 106         return_ACPI_STATUS(status);
 107 }
 108
 109 /*******************************************************************************
 110  *
 111  * FUNCTION:    acpi_ev_valid_gpe_event
 112  *
 113  * PARAMETERS:  gpe_event_info              - Info for this GPE
 114  *
 115  * RETURN:      TRUE if the gpe_event is valid
 116  *
 117  * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
 118  *              Should be called only when the GPE lists are semaphore locked
 119  *              and not subject to change.
 120  *
 121  ******************************************************************************/
 122
 123 u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
 124 {
 125         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
 126         struct acpi_gpe_block_info *gpe_block;
 127
 128         ACPI_FUNCTION_ENTRY();
 129
 130         /* No need for spin lock since we are not changing any list elements */
 131
 132         /* Walk the GPE interrupt levels */
 133
 134         gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
 135         while (gpe_xrupt_block) {
 136                 gpe_block = gpe_xrupt_block->gpe_block_list_head;
 137
 138                 /* Walk the GPE blocks on this interrupt level */
 139
 140                 while (gpe_block) {
 141                         if ((&gpe_block->event_info[0] <= gpe_event_info) &&
 142                             (&gpe_block->event_info[gpe_block->gpe_count] >
 143                              gpe_event_info)) {
 144                                 return (TRUE);
 145                         }
 146
 147                         gpe_block = gpe_block->next;
 148                 }
 149
 150                 gpe_xrupt_block = gpe_xrupt_block->next;
 151         }
 152
 153         return (FALSE);
 154 }
 155
 156 /*******************************************************************************
 157  *
 158  * FUNCTION:    acpi_ev_get_gpe_device
 159  *
 160  * PARAMETERS:  GPE_WALK_CALLBACK
 161  *
 162  * RETURN:      Status
 163  *
 164  * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 165  *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 166  *
 167  ******************************************************************************/
 168
 169 acpi_status
 170 acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 171                        struct acpi_gpe_block_info *gpe_block, void *context)
 172 {
 173         struct acpi_gpe_device_info *info = context;
 174
 175         /* Increment Index by the number of GPEs in this block */
 176
 177         info->next_block_base_index += gpe_block->gpe_count;
 178
 179         if (info->index < info->next_block_base_index) {
 180                 /*
 181                  * The GPE index is within this block, get the node. Leave the node
 182                  * NULL for the FADT-defined GPEs
 183                  */
 184                 if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
 185                         info->gpe_device = gpe_block->node;
 186                 }
 187
 188                 info->status = AE_OK;
 189                 return (AE_CTRL_END);
 190         }
 191
 192         return (AE_OK);
 193 }
 194
 195 /*******************************************************************************
 196  *
 197  * FUNCTION:    acpi_ev_get_gpe_xrupt_block
 198  *
 199  * PARAMETERS:  interrupt_number     - Interrupt for a GPE block
 200  *
 201  * RETURN:      A GPE interrupt block
 202  *
 203  * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
 204  *              block per unique interrupt level used for GPEs. Should be
 205  *              called only when the GPE lists are semaphore locked and not
 206  *              subject to change.
 207  *
 208  ******************************************************************************/
 209
 210 struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32 interrupt_number)
 211 {
 212         struct acpi_gpe_xrupt_info *next_gpe_xrupt;
 213         struct acpi_gpe_xrupt_info *gpe_xrupt;
 214         acpi_status status;
 215         acpi_cpu_flags flags;
 216
 217         ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
 218
 219         /* No need for lock since we are not changing any list elements here */
 220
 221         next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 222         while (next_gpe_xrupt) {
 223                 if (next_gpe_xrupt->interrupt_number == interrupt_number) {
 224                         return_PTR(next_gpe_xrupt);
 225                 }
 226
 227                 next_gpe_xrupt = next_gpe_xrupt->next;
 228         }
 229
 230         /* Not found, must allocate a new xrupt descriptor */
 231
 232         gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
 233         if (!gpe_xrupt) {
 234                 return_PTR(NULL);
 235         }
 236
 237         gpe_xrupt->interrupt_number = interrupt_number;
 238
 239         /* Install new interrupt descriptor with spin lock */
 240
 241         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 242         if (acpi_gbl_gpe_xrupt_list_head) {
 243                 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
 244                 while (next_gpe_xrupt->next) {
 245                         next_gpe_xrupt = next_gpe_xrupt->next;
 246                 }
 247
 248                 next_gpe_xrupt->next = gpe_xrupt;
 249                 gpe_xrupt->previous = next_gpe_xrupt;
 250         } else {
 251                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
 252         }
 253         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 254
 255         /* Install new interrupt handler if not SCI_INT */
 256
 257         if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
 258                 status = acpi_os_install_interrupt_handler(interrupt_number,
 259                                                            acpi_ev_gpe_xrupt_handler,
 260                                                            gpe_xrupt);
 261                 if (ACPI_FAILURE(status)) {
 262                         ACPI_ERROR((AE_INFO,
 263                                     "Could not install GPE interrupt handler at level 0x%X",
 264                                     interrupt_number));
 265                         return_PTR(NULL);
 266                 }
 267         }
 268
 269         return_PTR(gpe_xrupt);
 270 }
 271
 272 /*******************************************************************************
 273  *
 274  * FUNCTION:    acpi_ev_delete_gpe_xrupt
 275  *
 276  * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block
 277  *
 278  * RETURN:      Status
 279  *
 280  * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
 281  *              interrupt handler if not the SCI interrupt.
 282  *
 283  ******************************************************************************/
 284
 285 acpi_status acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
 286 {
 287         acpi_status status;
 288         acpi_cpu_flags flags;
 289
 290         ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
 291
 292         /* We never want to remove the SCI interrupt handler */
 293
 294         if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
 295                 gpe_xrupt->gpe_block_list_head = NULL;
 296                 return_ACPI_STATUS(AE_OK);
 297         }
 298
 299         /* Disable this interrupt */
 300
 301         status =
 302             acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
 303                                              acpi_ev_gpe_xrupt_handler);
 304         if (ACPI_FAILURE(status)) {
 305                 return_ACPI_STATUS(status);
 306         }
 307
 308         /* Unlink the interrupt block with lock */
 309
 310         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 311         if (gpe_xrupt->previous) {
 312                 gpe_xrupt->previous->next = gpe_xrupt->next;
 313         } else {
 314                 /* No previous, update list head */
 315
 316                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
 317         }
 318
 319         if (gpe_xrupt->next) {
 320                 gpe_xrupt->next->previous = gpe_xrupt->previous;
 321         }
 322         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 323
 324         /* Free the block */
 325
 326         ACPI_FREE(gpe_xrupt);
 327         return_ACPI_STATUS(AE_OK);
 328 }
 329
 330 /*******************************************************************************
 331  *
 332  * FUNCTION:    acpi_ev_delete_gpe_handlers
 333  *
 334  * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 335  *              gpe_block           - Gpe Block info
 336  *
 337  * RETURN:      Status
 338  *
 339  * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
 340  *              Used only prior to termination.
 341  *
 342  ******************************************************************************/
 343
 344 acpi_status
 345 acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
 346                             struct acpi_gpe_block_info *gpe_block,
 347                             void *context)
 348 {
 349         struct acpi_gpe_event_info *gpe_event_info;
 350         u32 i;
 351         u32 j;
 352
 353         ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);
 354
 355         /* Examine each GPE Register within the block */
 356
 357         for (i = 0; i < gpe_block->register_count; i++) {
 358
 359                 /* Now look at the individual GPEs in this byte register */
 360
 361                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 362                         gpe_event_info = &gpe_block->event_info[((acpi_size) i *
 363                                                                  ACPI_GPE_REGISTER_WIDTH)
 364                                                                 + j];
 365
 366                         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
 367                             ACPI_GPE_DISPATCH_HANDLER) {
 368                                 ACPI_FREE(gpe_event_info->dispatch.handler);
 369                                 gpe_event_info->dispatch.handler = NULL;
 370                                 gpe_event_info->flags &=
 371                                     ~ACPI_GPE_DISPATCH_MASK;
 372                         }
 373                 }
 374         }
 375
 376         return_ACPI_STATUS(AE_OK);
 377 }
 378
 379 #endif                          /* !ACPI_REDUCED_HARDWARE */