kernel/drivers/acpi/acpica/tbxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxface - ACPI table-oriented external interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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                 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_INTERNAL_PHYSICAL) {
 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
 246                                 memcpy(out_table_header, header,
 247                                        sizeof(struct acpi_table_header));
 248                                 acpi_os_unmap_memory(header,
 249                                                      sizeof(struct
 250                                                             acpi_table_header));
 251                         } else {
 252                                 return (AE_NOT_FOUND);
 253                         }
 254                 } else {
 255                         memcpy(out_table_header,
 256                                acpi_gbl_root_table_list.tables[i].pointer,
 257                                sizeof(struct acpi_table_header));
 258                 }
 259                 return (AE_OK);
 260         }
 261
 262         return (AE_NOT_FOUND);
 263 }
 264
 265 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
 266
 267 /*******************************************************************************
 268  *
 269  * FUNCTION:    acpi_get_table_with_size
 270  *
 271  * PARAMETERS:  signature           - ACPI signature of needed table
 272  *              instance            - Which instance (for SSDTs)
 273  *              out_table           - Where the pointer to the table is returned
 274  *
 275  * RETURN:      Status and pointer to the requested table
 276  *
 277  * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
 278  *              RSDT/XSDT.
 279  *
 280  ******************************************************************************/
 281 acpi_status
 282 acpi_get_table_with_size(char *signature,
 283                u32 instance, struct acpi_table_header **out_table,
 284                acpi_size *tbl_size)
 285 {
 286         u32 i;
 287         u32 j;
 288         acpi_status status;
 289
 290         /* Parameter validation */
 291
 292         if (!signature || !out_table) {
 293                 return (AE_BAD_PARAMETER);
 294         }
 295
 296         /* Walk the root table list */
 297
 298         for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
 299              i++) {
 300                 if (!ACPI_COMPARE_NAME
 301                     (&(acpi_gbl_root_table_list.tables[i].signature),
 302                      signature)) {
 303                         continue;
 304                 }
 305
 306                 if (++j < instance) {
 307                         continue;
 308                 }
 309
 310                 status =
 311                     acpi_tb_validate_table(&acpi_gbl_root_table_list.tables[i]);
 312                 if (ACPI_SUCCESS(status)) {
 313                         *out_table = acpi_gbl_root_table_list.tables[i].pointer;
 314                         *tbl_size = acpi_gbl_root_table_list.tables[i].length;
 315                 }
 316
 317                 if (!acpi_gbl_permanent_mmap) {
 318                         acpi_gbl_root_table_list.tables[i].pointer = NULL;
 319                 }
 320
 321                 return (status);
 322         }
 323
 324         return (AE_NOT_FOUND);
 325 }
 326
 327 ACPI_EXPORT_SYMBOL(acpi_get_table_with_size)
 328
 329 acpi_status
 330 acpi_get_table(char *signature,
 331                u32 instance, struct acpi_table_header **out_table)
 332 {
 333         acpi_size tbl_size;
 334
 335         return acpi_get_table_with_size(signature,
 336                        instance, out_table, &tbl_size);
 337 }
 338
 339 ACPI_EXPORT_SYMBOL(acpi_get_table)
 340
 341 /*******************************************************************************
 342  *
 343  * FUNCTION:    acpi_get_table_by_index
 344  *
 345  * PARAMETERS:  table_index         - Table index
 346  *              table               - Where the pointer to the table is returned
 347  *
 348  * RETURN:      Status and pointer to the requested table
 349  *
 350  * DESCRIPTION: Obtain a table by an index into the global table list. Used
 351  *              internally also.
 352  *
 353  ******************************************************************************/
 354 acpi_status
 355 acpi_get_table_by_index(u32 table_index, struct acpi_table_header ** table)
 356 {
 357         acpi_status status;
 358
 359         ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
 360
 361         /* Parameter validation */
 362
 363         if (!table) {
 364                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 365         }
 366
 367         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 368
 369         /* Validate index */
 370
 371         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 372                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 373                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 374         }
 375
 376         if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
 377
 378                 /* Table is not mapped, map it */
 379
 380                 status =
 381                     acpi_tb_validate_table(&acpi_gbl_root_table_list.
 382                                            tables[table_index]);
 383                 if (ACPI_FAILURE(status)) {
 384                         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 385                         return_ACPI_STATUS(status);
 386                 }
 387         }
 388
 389         *table = acpi_gbl_root_table_list.tables[table_index].pointer;
 390         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 391         return_ACPI_STATUS(AE_OK);
 392 }
 393
 394 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
 395
 396 /*******************************************************************************
 397  *
 398  * FUNCTION:    acpi_install_table_handler
 399  *
 400  * PARAMETERS:  handler         - Table event handler
 401  *              context         - Value passed to the handler on each event
 402  *
 403  * RETURN:      Status
 404  *
 405  * DESCRIPTION: Install a global table event handler.
 406  *
 407  ******************************************************************************/
 408 acpi_status
 409 acpi_install_table_handler(acpi_table_handler handler, void *context)
 410 {
 411         acpi_status status;
 412
 413         ACPI_FUNCTION_TRACE(acpi_install_table_handler);
 414
 415         if (!handler) {
 416                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 417         }
 418
 419         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 420         if (ACPI_FAILURE(status)) {
 421                 return_ACPI_STATUS(status);
 422         }
 423
 424         /* Don't allow more than one handler */
 425
 426         if (acpi_gbl_table_handler) {
 427                 status = AE_ALREADY_EXISTS;
 428                 goto cleanup;
 429         }
 430
 431         /* Install the handler */
 432
 433         acpi_gbl_table_handler = handler;
 434         acpi_gbl_table_handler_context = context;
 435
 436 cleanup:
 437         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 438         return_ACPI_STATUS(status);
 439 }
 440
 441 ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
 442
 443 /*******************************************************************************
 444  *
 445  * FUNCTION:    acpi_remove_table_handler
 446  *
 447  * PARAMETERS:  handler         - Table event handler that was installed
 448  *                                previously.
 449  *
 450  * RETURN:      Status
 451  *
 452  * DESCRIPTION: Remove a table event handler
 453  *
 454  ******************************************************************************/
 455 acpi_status acpi_remove_table_handler(acpi_table_handler handler)
 456 {
 457         acpi_status status;
 458
 459         ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
 460
 461         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 462         if (ACPI_FAILURE(status)) {
 463                 return_ACPI_STATUS(status);
 464         }
 465
 466         /* Make sure that the installed handler is the same */
 467
 468         if (!handler || handler != acpi_gbl_table_handler) {
 469                 status = AE_BAD_PARAMETER;
 470                 goto cleanup;
 471         }
 472
 473         /* Remove the handler */
 474
 475         acpi_gbl_table_handler = NULL;
 476
 477 cleanup:
 478         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 479         return_ACPI_STATUS(status);
 480 }
 481
 482 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)