drivers/acpi/acpica/tbxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxface - ACPI table-oriented external interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2014, 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 #define EXPORT_ACPI_INTERFACES
  45
  46 #include <acpi/acpi.h>
  47 #include "accommon.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_resize        - 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          * Setup the Root Table Array and allocate the table array
 112          * 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 ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_tables)
 152
 153 /*******************************************************************************
 154  *
 155  * FUNCTION:    acpi_reallocate_root_table
 156  *
 157  * PARAMETERS:  None
 158  *
 159  * RETURN:      Status
 160  *
 161  * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
 162  *              root list from the previously provided scratch area. Should
 163  *              be called once dynamic memory allocation is available in the
 164  *              kernel.
 165  *
 166  ******************************************************************************/
 167 acpi_status __init acpi_reallocate_root_table(void)
 168 {
 169         acpi_status status;
 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         acpi_gbl_root_table_list.flags |= ACPI_ROOT_ALLOW_RESIZE;
 182
 183         status = acpi_tb_resize_root_table_list();
 184         return_ACPI_STATUS(status);
 185 }
 186
 187 ACPI_EXPORT_SYMBOL_INIT(acpi_reallocate_root_table)
 188
 189 /*******************************************************************************
 190  *
 191  * FUNCTION:    acpi_get_table_header
 192  *
 193  * PARAMETERS:  signature           - ACPI signature of needed table
 194  *              instance            - Which instance (for SSDTs)
 195  *              out_table_header    - The pointer to the table header to fill
 196  *
 197  * RETURN:      Status and pointer to mapped table header
 198  *
 199  * DESCRIPTION: Finds an ACPI table header.
 200  *
 201  * NOTE:        Caller is responsible in unmapping the header with
 202  *              acpi_os_unmap_memory
 203  *
 204  ******************************************************************************/
 205 acpi_status
 206 acpi_get_table_header(char *signature,
 207                       u32 instance, struct acpi_table_header *out_table_header)
 208 {
 209        u32 i;
 210        u32 j;
 211         struct acpi_table_header *header;
 212
 213         /* Parameter validation */
 214
 215         if (!signature || !out_table_header) {
 216                 return (AE_BAD_PARAMETER);
 217         }
 218
 219         /* Walk the root table list */
 220
 221         for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
 222              i++) {
 223                 if (!ACPI_COMPARE_NAME
 224                     (&(acpi_gbl_root_table_list.tables[i].signature),
 225                      signature)) {
 226                         continue;
 227                 }
 228
 229                 if (++j < instance) {
 230                         continue;
 231                 }
 232
 233                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 234                         if ((acpi_gbl_root_table_list.tables[i].flags &
 235                              ACPI_TABLE_ORIGIN_MASK) ==
 236                             ACPI_TABLE_ORIGIN_MAPPED) {
 237                                 header =
 238                                     acpi_os_map_memory(acpi_gbl_root_table_list.
 239                                                        tables[i].address,
 240                                                        sizeof(struct
 241                                                               acpi_table_header));
 242                                 if (!header) {
 243                                         return (AE_NO_MEMORY);
 244                                 }
 245                                 ACPI_MEMCPY(out_table_header, header,
 246                                             sizeof(struct acpi_table_header));
 247                                 acpi_os_unmap_memory(header,
 248                                                      sizeof(struct
 249                                                             acpi_table_header));
 250                         } else {
 251                                 return (AE_NOT_FOUND);
 252                         }
 253                 } else {
 254                         ACPI_MEMCPY(out_table_header,
 255                                     acpi_gbl_root_table_list.tables[i].pointer,
 256                                     sizeof(struct acpi_table_header));
 257                 }
 258                 return (AE_OK);
 259         }
 260
 261         return (AE_NOT_FOUND);
 262 }
 263
 264 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
 265
 266 /*******************************************************************************
 267  *
 268  * FUNCTION:    acpi_unload_table_id
 269  *
 270  * PARAMETERS:  id            - Owner ID of the table to be removed.
 271  *
 272  * RETURN:      Status
 273  *
 274  * DESCRIPTION: This routine is used to force the unload of a table (by id)
 275  *
 276  ******************************************************************************/
 277 acpi_status acpi_unload_table_id(acpi_owner_id id)
 278 {
 279         int i;
 280         acpi_status status = AE_NOT_EXIST;
 281
 282         ACPI_FUNCTION_TRACE(acpi_unload_table_id);
 283
 284         /* Find table in the global table list */
 285         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 286                 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
 287                         continue;
 288                 }
 289                 /*
 290                  * Delete all namespace objects owned by this table. Note that these
 291                  * objects can appear anywhere in the namespace by virtue of the AML
 292                  * "Scope" operator. Thus, we need to track ownership by an ID, not
 293                  * simply a position within the hierarchy
 294                  */
 295                 acpi_tb_delete_namespace_by_owner(i);
 296                 status = acpi_tb_release_owner_id(i);
 297                 acpi_tb_set_table_loaded_flag(i, FALSE);
 298                 break;
 299         }
 300         return_ACPI_STATUS(status);
 301 }
 302
 303 ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
 304
 305 /*******************************************************************************
 306  *
 307  * FUNCTION:    acpi_get_table_with_size
 308  *
 309  * PARAMETERS:  signature           - ACPI signature of needed table
 310  *              instance            - Which instance (for SSDTs)
 311  *              out_table           - Where the pointer to the table is returned
 312  *
 313  * RETURN:      Status and pointer to the requested table
 314  *
 315  * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
 316  *              RSDT/XSDT.
 317  *
 318  ******************************************************************************/
 319 acpi_status
 320 acpi_get_table_with_size(char *signature,
 321                u32 instance, struct acpi_table_header **out_table,
 322                acpi_size *tbl_size)
 323 {
 324        u32 i;
 325        u32 j;
 326         acpi_status status;
 327
 328         /* Parameter validation */
 329
 330         if (!signature || !out_table) {
 331                 return (AE_BAD_PARAMETER);
 332         }
 333
 334         /* Walk the root table list */
 335
 336         for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
 337              i++) {
 338                 if (!ACPI_COMPARE_NAME
 339                     (&(acpi_gbl_root_table_list.tables[i].signature),
 340                      signature)) {
 341                         continue;
 342                 }
 343
 344                 if (++j < instance) {
 345                         continue;
 346                 }
 347
 348                 status =
 349                     acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
 350                 if (ACPI_SUCCESS(status)) {
 351                         *out_table = acpi_gbl_root_table_list.tables[i].pointer;
 352                         *tbl_size = acpi_gbl_root_table_list.tables[i].length;
 353                 }
 354
 355                 if (!acpi_gbl_permanent_mmap) {
 356                         acpi_gbl_root_table_list.tables[i].pointer = NULL;
 357                 }
 358
 359                 return (status);
 360         }
 361
 362         return (AE_NOT_FOUND);
 363 }
 364
 365 ACPI_EXPORT_SYMBOL(acpi_get_table_with_size)
 366
 367 acpi_status
 368 acpi_get_table(char *signature,
 369                u32 instance, struct acpi_table_header **out_table)
 370 {
 371         acpi_size tbl_size;
 372
 373         return acpi_get_table_with_size(signature,
 374                        instance, out_table, &tbl_size);
 375 }
 376
 377 ACPI_EXPORT_SYMBOL(acpi_get_table)
 378
 379 /*******************************************************************************
 380  *
 381  * FUNCTION:    acpi_get_table_by_index
 382  *
 383  * PARAMETERS:  table_index         - Table index
 384  *              table               - Where the pointer to the table is returned
 385  *
 386  * RETURN:      Status and pointer to the requested table
 387  *
 388  * DESCRIPTION: Obtain a table by an index into the global table list. Used
 389  *              internally also.
 390  *
 391  ******************************************************************************/
 392 acpi_status
 393 acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
 394 {
 395         acpi_status status;
 396
 397         ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
 398
 399         /* Parameter validation */
 400
 401         if (!table) {
 402                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 403         }
 404
 405         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 406
 407         /* Validate index */
 408
 409         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 410                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 411                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 412         }
 413
 414         if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
 415
 416                 /* Table is not mapped, map it */
 417
 418                 status =
 419                     acpi_tb_verify_table(&acpi_gbl_root_table_list.
 420                                          tables[table_index]);
 421                 if (ACPI_FAILURE(status)) {
 422                         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 423                         return_ACPI_STATUS(status);
 424                 }
 425         }
 426
 427         *table = acpi_gbl_root_table_list.tables[table_index].pointer;
 428         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 429         return_ACPI_STATUS(AE_OK);
 430 }
 431
 432 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
 433
 434 /*******************************************************************************
 435  *
 436  * FUNCTION:    acpi_install_table_handler
 437  *
 438  * PARAMETERS:  handler         - Table event handler
 439  *              context         - Value passed to the handler on each event
 440  *
 441  * RETURN:      Status
 442  *
 443  * DESCRIPTION: Install a global table event handler.
 444  *
 445  ******************************************************************************/
 446 acpi_status
 447 acpi_install_table_handler(acpi_table_handler handler, void *context)
 448 {
 449         acpi_status status;
 450
 451         ACPI_FUNCTION_TRACE(acpi_install_table_handler);
 452
 453         if (!handler) {
 454                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 455         }
 456
 457         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 458         if (ACPI_FAILURE(status)) {
 459                 return_ACPI_STATUS(status);
 460         }
 461
 462         /* Don't allow more than one handler */
 463
 464         if (acpi_gbl_table_handler) {
 465                 status = AE_ALREADY_EXISTS;
 466                 goto cleanup;
 467         }
 468
 469         /* Install the handler */
 470
 471         acpi_gbl_table_handler = handler;
 472         acpi_gbl_table_handler_context = context;
 473
 474 cleanup:
 475         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 476         return_ACPI_STATUS(status);
 477 }
 478
 479 ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
 480
 481 /*******************************************************************************
 482  *
 483  * FUNCTION:    acpi_remove_table_handler
 484  *
 485  * PARAMETERS:  handler         - Table event handler that was installed
 486  *                                previously.
 487  *
 488  * RETURN:      Status
 489  *
 490  * DESCRIPTION: Remove a table event handler
 491  *
 492  ******************************************************************************/
 493 acpi_status acpi_remove_table_handler(acpi_table_handler handler)
 494 {
 495         acpi_status status;
 496
 497         ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
 498
 499         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 500         if (ACPI_FAILURE(status)) {
 501                 return_ACPI_STATUS(status);
 502         }
 503
 504         /* Make sure that the installed handler is the same */
 505
 506         if (!handler || handler != acpi_gbl_table_handler) {
 507                 status = AE_BAD_PARAMETER;
 508                 goto cleanup;
 509         }
 510
 511         /* Remove the handler */
 512
 513         acpi_gbl_table_handler = NULL;
 514
 515 cleanup:
 516         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 517         return_ACPI_STATUS(status);
 518 }
 519
 520 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)