drivers/acpi/acpica/tbxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxface - ACPI table oriented external interfaces
   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 <linux/export.h>
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acnamesp.h"
  48 #include "actables.h"
  49
  50 #define _COMPONENT          ACPI_TABLES
  51 ACPI_MODULE_NAME("tbxface")
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_allocate_root_table
  56  *
  57  * PARAMETERS:  initial_table_count - Size of initial_table_array, in number of
  58  *                                    struct acpi_table_desc structures
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Allocate a root table array. Used by iASL compiler and
  63  *              acpi_initialize_tables.
  64  *
  65  ******************************************************************************/
  66 acpi_status acpi_allocate_root_table(u32 initial_table_count)
  67 {
  68
  69         acpi_gbl_root_table_list.max_table_count = initial_table_count;
  70         acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
  71
  72         return (acpi_tb_resize_root_table_list());
  73 }
  74
  75 /*******************************************************************************
  76  *
  77  * FUNCTION:    acpi_initialize_tables
  78  *
  79  * PARAMETERS:  initial_table_array - Pointer to an array of pre-allocated
  80  *                                    struct acpi_table_desc structures. If NULL, the
  81  *                                    array is dynamically allocated.
  82  *              initial_table_count - Size of initial_table_array, in number of
  83  *                                    struct acpi_table_desc structures
  84  *              allow_realloc       - Flag to tell Table Manager if resize of
  85  *                                    pre-allocated array is allowed. Ignored
  86  *                                    if initial_table_array is NULL.
  87  *
  88  * RETURN:      Status
  89  *
  90  * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
  91  *
  92  * NOTE:        Allows static allocation of the initial table array in order
  93  *              to avoid the use of dynamic memory in confined environments
  94  *              such as the kernel boot sequence where it may not be available.
  95  *
  96  *              If the host OS memory managers are initialized, use NULL for
  97  *              initial_table_array, and the table will be dynamically allocated.
  98  *
  99  ******************************************************************************/
 100
 101 acpi_status __init
 102 acpi_initialize_tables(struct acpi_table_desc * initial_table_array,
 103                        u32 initial_table_count, u8 allow_resize)
 104 {
 105         acpi_physical_address rsdp_address;
 106         acpi_status status;
 107
 108         ACPI_FUNCTION_TRACE(acpi_initialize_tables);
 109
 110         /*
 111          * Set up the Root Table Array
 112          * Allocate the table array if requested
 113          */
 114         if (!initial_table_array) {
 115                 status = acpi_allocate_root_table(initial_table_count);
 116                 if (ACPI_FAILURE(status)) {
 117                         return_ACPI_STATUS(status);
 118                 }
 119         } else {
 120                 /* Root Table Array has been statically allocated by the host */
 121
 122                 ACPI_MEMSET(initial_table_array, 0,
 123                             (acpi_size) initial_table_count *
 124                             sizeof(struct acpi_table_desc));
 125
 126                 acpi_gbl_root_table_list.tables = initial_table_array;
 127                 acpi_gbl_root_table_list.max_table_count = initial_table_count;
 128                 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
 129                 if (allow_resize) {
 130                         acpi_gbl_root_table_list.flags |=
 131                             ACPI_ROOT_ALLOW_RESIZE;
 132                 }
 133         }
 134
 135         /* Get the address of the RSDP */
 136
 137         rsdp_address = acpi_os_get_root_pointer();
 138         if (!rsdp_address) {
 139                 return_ACPI_STATUS(AE_NOT_FOUND);
 140         }
 141
 142         /*
 143          * Get the root table (RSDT or XSDT) and extract all entries to the local
 144          * Root Table Array. This array contains the information of the RSDT/XSDT
 145          * in a common, more useable format.
 146          */
 147         status = acpi_tb_parse_root_table(rsdp_address);
 148         return_ACPI_STATUS(status);
 149 }
 150
 151 /*******************************************************************************
 152  *
 153  * FUNCTION:    acpi_reallocate_root_table
 154  *
 155  * PARAMETERS:  None
 156  *
 157  * RETURN:      Status
 158  *
 159  * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
 160  *              root list from the previously provided scratch area. Should
 161  *              be called once dynamic memory allocation is available in the
 162  *              kernel
 163  *
 164  ******************************************************************************/
 165 acpi_status acpi_reallocate_root_table(void)
 166 {
 167         struct acpi_table_desc *tables;
 168         acpi_size new_size;
 169         acpi_size current_size;
 170
 171         ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
 172
 173         /*
 174          * Only reallocate the root table if the host provided a static buffer
 175          * for the table array in the call to acpi_initialize_tables.
 176          */
 177         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 178                 return_ACPI_STATUS(AE_SUPPORT);
 179         }
 180
 181         /*
 182          * Get the current size of the root table and add the default
 183          * increment to create the new table size.
 184          */
 185         current_size = (acpi_size)
 186             acpi_gbl_root_table_list.current_table_count *
 187             sizeof(struct acpi_table_desc);
 188
 189         new_size = current_size +
 190             (ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof(struct acpi_table_desc));
 191
 192         /* Create new array and copy the old array */
 193
 194         tables = ACPI_ALLOCATE_ZEROED(new_size);
 195         if (!tables) {
 196                 return_ACPI_STATUS(AE_NO_MEMORY);
 197         }
 198
 199         ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, current_size);
 200
 201         /*
 202          * Update the root table descriptor. The new size will be the current
 203          * number of tables plus the increment, independent of the reserved
 204          * size of the original table list.
 205          */
 206         acpi_gbl_root_table_list.tables = tables;
 207         acpi_gbl_root_table_list.max_table_count =
 208             acpi_gbl_root_table_list.current_table_count +
 209             ACPI_ROOT_TABLE_SIZE_INCREMENT;
 210         acpi_gbl_root_table_list.flags =
 211             ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
 212
 213         return_ACPI_STATUS(AE_OK);
 214 }
 215
 216 /*******************************************************************************
 217  *
 218  * FUNCTION:    acpi_get_table_header
 219  *
 220  * PARAMETERS:  signature           - ACPI signature of needed table
 221  *              instance            - Which instance (for SSDTs)
 222  *              out_table_header    - The pointer to the table header to fill
 223  *
 224  * RETURN:      Status and pointer to mapped table header
 225  *
 226  * DESCRIPTION: Finds an ACPI table header.
 227  *
 228  * NOTE:        Caller is responsible in unmapping the header with
 229  *              acpi_os_unmap_memory
 230  *
 231  ******************************************************************************/
 232 acpi_status
 233 acpi_get_table_header(char *signature,
 234                       u32 instance, struct acpi_table_header *out_table_header)
 235 {
 236        u32 i;
 237        u32 j;
 238         struct acpi_table_header *header;
 239
 240         /* Parameter validation */
 241
 242         if (!signature || !out_table_header) {
 243                 return (AE_BAD_PARAMETER);
 244         }
 245
 246         /* Walk the root table list */
 247
 248         for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
 249              i++) {
 250                 if (!ACPI_COMPARE_NAME
 251                     (&(acpi_gbl_root_table_list.tables[i].signature),
 252                      signature)) {
 253                         continue;
 254                 }
 255
 256                 if (++j < instance) {
 257                         continue;
 258                 }
 259
 260                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 261                         if ((acpi_gbl_root_table_list.tables[i].flags &
 262                              ACPI_TABLE_ORIGIN_MASK) ==
 263                             ACPI_TABLE_ORIGIN_MAPPED) {
 264                                 header =
 265                                     acpi_os_map_memory(acpi_gbl_root_table_list.
 266                                                        tables[i].address,
 267                                                        sizeof(struct
 268                                                               acpi_table_header));
 269                                 if (!header) {
 270                                         return AE_NO_MEMORY;
 271                                 }
 272                                 ACPI_MEMCPY(out_table_header, header,
 273                                             sizeof(struct acpi_table_header));
 274                                 acpi_os_unmap_memory(header,
 275                                                      sizeof(struct
 276                                                             acpi_table_header));
 277                         } else {
 278                                 return AE_NOT_FOUND;
 279                         }
 280                 } else {
 281                         ACPI_MEMCPY(out_table_header,
 282                                     acpi_gbl_root_table_list.tables[i].pointer,
 283                                     sizeof(struct acpi_table_header));
 284                 }
 285                 return (AE_OK);
 286         }
 287
 288         return (AE_NOT_FOUND);
 289 }
 290
 291 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
 292
 293 /*******************************************************************************
 294  *
 295  * FUNCTION:    acpi_unload_table_id
 296  *
 297  * PARAMETERS:  id            - Owner ID of the table to be removed.
 298  *
 299  * RETURN:      Status
 300  *
 301  * DESCRIPTION: This routine is used to force the unload of a table (by id)
 302  *
 303  ******************************************************************************/
 304 acpi_status acpi_unload_table_id(acpi_owner_id id)
 305 {
 306         int i;
 307         acpi_status status = AE_NOT_EXIST;
 308
 309         ACPI_FUNCTION_TRACE(acpi_unload_table_id);
 310
 311         /* Find table in the global table list */
 312         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 313                 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
 314                         continue;
 315                 }
 316                 /*
 317                  * Delete all namespace objects owned by this table. Note that these
 318                  * objects can appear anywhere in the namespace by virtue of the AML
 319                  * "Scope" operator. Thus, we need to track ownership by an ID, not
 320                  * simply a position within the hierarchy
 321                  */
 322                 acpi_tb_delete_namespace_by_owner(i);
 323                 status = acpi_tb_release_owner_id(i);
 324                 acpi_tb_set_table_loaded_flag(i, FALSE);
 325                 break;
 326         }
 327         return_ACPI_STATUS(status);
 328 }
 329
 330 ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
 331
 332 /*******************************************************************************
 333  *
 334  * FUNCTION:    acpi_get_table_with_size
 335  *
 336  * PARAMETERS:  signature           - ACPI signature of needed table
 337  *              instance            - Which instance (for SSDTs)
 338  *              out_table           - Where the pointer to the table is returned
 339  *
 340  * RETURN:      Status and pointer to table
 341  *
 342  * DESCRIPTION: Finds and verifies an ACPI table.
 343  *
 344  ******************************************************************************/
 345 acpi_status
 346 acpi_get_table_with_size(char *signature,
 347                u32 instance, struct acpi_table_header **out_table,
 348                acpi_size *tbl_size)
 349 {
 350        u32 i;
 351        u32 j;
 352         acpi_status status;
 353
 354         /* Parameter validation */
 355
 356         if (!signature || !out_table) {
 357                 return (AE_BAD_PARAMETER);
 358         }
 359
 360         /* Walk the root table list */
 361
 362         for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
 363              i++) {
 364                 if (!ACPI_COMPARE_NAME
 365                     (&(acpi_gbl_root_table_list.tables[i].signature),
 366                      signature)) {
 367                         continue;
 368                 }
 369
 370                 if (++j < instance) {
 371                         continue;
 372                 }
 373
 374                 status =
 375                     acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
 376                 if (ACPI_SUCCESS(status)) {
 377                         *out_table = acpi_gbl_root_table_list.tables[i].pointer;
 378                         *tbl_size = acpi_gbl_root_table_list.tables[i].length;
 379                 }
 380
 381                 if (!acpi_gbl_permanent_mmap) {
 382                         acpi_gbl_root_table_list.tables[i].pointer = NULL;
 383                 }
 384
 385                 return (status);
 386         }
 387
 388         return (AE_NOT_FOUND);
 389 }
 390
 391 acpi_status
 392 acpi_get_table(char *signature,
 393                u32 instance, struct acpi_table_header **out_table)
 394 {
 395         acpi_size tbl_size;
 396
 397         return acpi_get_table_with_size(signature,
 398                        instance, out_table, &tbl_size);
 399 }
 400 ACPI_EXPORT_SYMBOL(acpi_get_table)
 401
 402 /*******************************************************************************
 403  *
 404  * FUNCTION:    acpi_get_table_by_index
 405  *
 406  * PARAMETERS:  table_index         - Table index
 407  *              table               - Where the pointer to the table is returned
 408  *
 409  * RETURN:      Status and pointer to the table
 410  *
 411  * DESCRIPTION: Obtain a table by an index into the global table list.
 412  *
 413  ******************************************************************************/
 414 acpi_status
 415 acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
 416 {
 417         acpi_status status;
 418
 419         ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
 420
 421         /* Parameter validation */
 422
 423         if (!table) {
 424                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 425         }
 426
 427         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 428
 429         /* Validate index */
 430
 431         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 432                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 433                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 434         }
 435
 436         if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
 437
 438                 /* Table is not mapped, map it */
 439
 440                 status =
 441                     acpi_tb_verify_table(&acpi_gbl_root_table_list.
 442                                          tables[table_index]);
 443                 if (ACPI_FAILURE(status)) {
 444                         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 445                         return_ACPI_STATUS(status);
 446                 }
 447         }
 448
 449         *table = acpi_gbl_root_table_list.tables[table_index].pointer;
 450         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 451         return_ACPI_STATUS(AE_OK);
 452 }
 453
 454 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
 455
 456
 457 /*******************************************************************************
 458  *
 459  * FUNCTION:    acpi_install_table_handler
 460  *
 461  * PARAMETERS:  handler         - Table event handler
 462  *              context         - Value passed to the handler on each event
 463  *
 464  * RETURN:      Status
 465  *
 466  * DESCRIPTION: Install table event handler
 467  *
 468  ******************************************************************************/
 469 acpi_status
 470 acpi_install_table_handler(acpi_tbl_handler handler, void *context)
 471 {
 472         acpi_status status;
 473
 474         ACPI_FUNCTION_TRACE(acpi_install_table_handler);
 475
 476         if (!handler) {
 477                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 478         }
 479
 480         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 481         if (ACPI_FAILURE(status)) {
 482                 return_ACPI_STATUS(status);
 483         }
 484
 485         /* Don't allow more than one handler */
 486
 487         if (acpi_gbl_table_handler) {
 488                 status = AE_ALREADY_EXISTS;
 489                 goto cleanup;
 490         }
 491
 492         /* Install the handler */
 493
 494         acpi_gbl_table_handler = handler;
 495         acpi_gbl_table_handler_context = context;
 496
 497       cleanup:
 498         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 499         return_ACPI_STATUS(status);
 500 }
 501
 502 ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
 503
 504 /*******************************************************************************
 505  *
 506  * FUNCTION:    acpi_remove_table_handler
 507  *
 508  * PARAMETERS:  handler         - Table event handler that was installed
 509  *                                previously.
 510  *
 511  * RETURN:      Status
 512  *
 513  * DESCRIPTION: Remove table event handler
 514  *
 515  ******************************************************************************/
 516 acpi_status acpi_remove_table_handler(acpi_tbl_handler handler)
 517 {
 518         acpi_status status;
 519
 520         ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
 521
 522         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 523         if (ACPI_FAILURE(status)) {
 524                 return_ACPI_STATUS(status);
 525         }
 526
 527         /* Make sure that the installed handler is the same */
 528
 529         if (!handler || handler != acpi_gbl_table_handler) {
 530                 status = AE_BAD_PARAMETER;
 531                 goto cleanup;
 532         }
 533
 534         /* Remove the handler */
 535
 536         acpi_gbl_table_handler = NULL;
 537
 538       cleanup:
 539         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 540         return_ACPI_STATUS(status);
 541 }
 542
 543 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)