drivers/acpi/acpica/tbxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxface - ACPI table-oriented external interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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 ACPI_INIT_FUNCTION
 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 ACPI_INIT_FUNCTION acpi_reallocate_root_table(void)
 168 {
 169         acpi_status status;
 170         u32 i;
 171
 172         ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
 173
 174         /*
 175          * Only reallocate the root table if the host provided a static buffer
 176          * for the table array in the call to acpi_initialize_tables.
 177          */
 178         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 179                 return_ACPI_STATUS(AE_SUPPORT);
 180         }
 181
 182         /*
 183          * Ensure OS early boot logic, which is required by some hosts. If the
 184          * table state is reported to be wrong, developers should fix the
 185          * issue by invoking acpi_put_table() for the reported table during the
 186          * early stage.
 187          */
 188         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 189                 if (acpi_gbl_root_table_list.tables[i].pointer) {
 190                         ACPI_ERROR((AE_INFO,
 191                                     "Table [%4.4s] is not invalidated during early boot stage",
 192                                     acpi_gbl_root_table_list.tables[i].
 193                                     signature.ascii));
 194                 }
 195         }
 196
 197         acpi_gbl_root_table_list.flags |= ACPI_ROOT_ALLOW_RESIZE;
 198
 199         status = acpi_tb_resize_root_table_list();
 200         return_ACPI_STATUS(status);
 201 }
 202
 203 ACPI_EXPORT_SYMBOL_INIT(acpi_reallocate_root_table)
 204
 205 /*******************************************************************************
 206  *
 207  * FUNCTION:    acpi_get_table_header
 208  *
 209  * PARAMETERS:  signature           - ACPI signature of needed table
 210  *              instance            - Which instance (for SSDTs)
 211  *              out_table_header    - The pointer to the table header to fill
 212  *
 213  * RETURN:      Status and pointer to mapped table header
 214  *
 215  * DESCRIPTION: Finds an ACPI table header.
 216  *
 217  * NOTE:        Caller is responsible in unmapping the header with
 218  *              acpi_os_unmap_memory
 219  *
 220  ******************************************************************************/
 221 acpi_status
 222 acpi_get_table_header(char *signature,
 223                       u32 instance, struct acpi_table_header *out_table_header)
 224 {
 225         u32 i;
 226         u32 j;
 227         struct acpi_table_header *header;
 228
 229         /* Parameter validation */
 230
 231         if (!signature || !out_table_header) {
 232                 return (AE_BAD_PARAMETER);
 233         }
 234
 235         /* Walk the root table list */
 236
 237         for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
 238              i++) {
 239                 if (!ACPI_COMPARE_NAME
 240                     (&(acpi_gbl_root_table_list.tables[i].signature),
 241                      signature)) {
 242                         continue;
 243                 }
 244
 245                 if (++j < instance) {
 246                         continue;
 247                 }
 248
 249                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 250                         if ((acpi_gbl_root_table_list.tables[i].flags &
 251                              ACPI_TABLE_ORIGIN_MASK) ==
 252                             ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL) {
 253                                 header =
 254                                     acpi_os_map_memory(acpi_gbl_root_table_list.
 255                                                        tables[i].address,
 256                                                        sizeof(struct
 257                                                               acpi_table_header));
 258                                 if (!header) {
 259                                         return (AE_NO_MEMORY);
 260                                 }
 261
 262                                 memcpy(out_table_header, header,
 263                                        sizeof(struct acpi_table_header));
 264                                 acpi_os_unmap_memory(header,
 265                                                      sizeof(struct
 266                                                             acpi_table_header));
 267                         } else {
 268                                 return (AE_NOT_FOUND);
 269                         }
 270                 } else {
 271                         memcpy(out_table_header,
 272                                acpi_gbl_root_table_list.tables[i].pointer,
 273                                sizeof(struct acpi_table_header));
 274                 }
 275                 return (AE_OK);
 276         }
 277
 278         return (AE_NOT_FOUND);
 279 }
 280
 281 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
 282
 283 /*******************************************************************************
 284  *
 285  * FUNCTION:    acpi_get_table
 286  *
 287  * PARAMETERS:  signature           - ACPI signature of needed table
 288  *              instance            - Which instance (for SSDTs)
 289  *              out_table           - Where the pointer to the table is returned
 290  *
 291  * RETURN:      Status and pointer to the requested table
 292  *
 293  * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
 294  *              RSDT/XSDT.
 295  *              Note that an early stage acpi_get_table() call must be paired
 296  *              with an early stage acpi_put_table() call. otherwise the table
 297  *              pointer mapped by the early stage mapping implementation may be
 298  *              erroneously unmapped by the late stage unmapping implementation
 299  *              in an acpi_put_table() invoked during the late stage.
 300  *
 301  ******************************************************************************/
 302 acpi_status
 303 acpi_get_table(char *signature,
 304                u32 instance, struct acpi_table_header ** out_table)
 305 {
 306         u32 i;
 307         u32 j;
 308         acpi_status status = AE_NOT_FOUND;
 309         struct acpi_table_desc *table_desc;
 310
 311         /* Parameter validation */
 312
 313         if (!signature || !out_table) {
 314                 return (AE_BAD_PARAMETER);
 315         }
 316
 317         /*
 318          * Note that the following line is required by some OSPMs, they only
 319          * check if the returned table is NULL instead of the returned status
 320          * to determined if this function is succeeded.
 321          */
 322         *out_table = NULL;
 323
 324         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 325
 326         /* Walk the root table list */
 327
 328         for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
 329              i++) {
 330                 table_desc = &acpi_gbl_root_table_list.tables[i];
 331
 332                 if (!ACPI_COMPARE_NAME(&table_desc->signature, signature)) {
 333                         continue;
 334                 }
 335
 336                 if (++j < instance) {
 337                         continue;
 338                 }
 339
 340                 status = acpi_tb_get_table(table_desc, out_table);
 341                 break;
 342         }
 343
 344         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 345         return (status);
 346 }
 347
 348 ACPI_EXPORT_SYMBOL(acpi_get_table)
 349
 350 /*******************************************************************************
 351  *
 352  * FUNCTION:    acpi_put_table
 353  *
 354  * PARAMETERS:  table               - The pointer to the table
 355  *
 356  * RETURN:      None
 357  *
 358  * DESCRIPTION: Release a table returned by acpi_get_table() and its clones.
 359  *              Note that it is not safe if this function was invoked after an
 360  *              uninstallation happened to the original table descriptor.
 361  *              Currently there is no OSPMs' requirement to handle such
 362  *              situations.
 363  *
 364  ******************************************************************************/
 365 void acpi_put_table(struct acpi_table_header *table)
 366 {
 367         u32 i;
 368         struct acpi_table_desc *table_desc;
 369
 370         ACPI_FUNCTION_TRACE(acpi_put_table);
 371
 372         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 373
 374         /* Walk the root table list */
 375
 376         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 377                 table_desc = &acpi_gbl_root_table_list.tables[i];
 378
 379                 if (table_desc->pointer != table) {
 380                         continue;
 381                 }
 382
 383                 acpi_tb_put_table(table_desc);
 384                 break;
 385         }
 386
 387         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 388         return_VOID;
 389 }
 390
 391 ACPI_EXPORT_SYMBOL(acpi_put_table)
 392
 393 /*******************************************************************************
 394  *
 395  * FUNCTION:    acpi_get_table_by_index
 396  *
 397  * PARAMETERS:  table_index         - Table index
 398  *              out_table           - Where the pointer to the table is returned
 399  *
 400  * RETURN:      Status and pointer to the requested table
 401  *
 402  * DESCRIPTION: Obtain a table by an index into the global table list. Used
 403  *              internally also.
 404  *
 405  ******************************************************************************/
 406 acpi_status
 407 acpi_get_table_by_index(u32 table_index, struct acpi_table_header **out_table)
 408 {
 409         acpi_status status;
 410
 411         ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
 412
 413         /* Parameter validation */
 414
 415         if (!out_table) {
 416                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 417         }
 418
 419         /*
 420          * Note that the following line is required by some OSPMs, they only
 421          * check if the returned table is NULL instead of the returned status
 422          * to determined if this function is succeeded.
 423          */
 424         *out_table = NULL;
 425
 426         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 427
 428         /* Validate index */
 429
 430         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 431                 status = AE_BAD_PARAMETER;
 432                 goto unlock_and_exit;
 433         }
 434
 435         status =
 436             acpi_tb_get_table(&acpi_gbl_root_table_list.tables[table_index],
 437                               out_table);
 438
 439 unlock_and_exit:
 440         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 441         return_ACPI_STATUS(status);
 442 }
 443
 444 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
 445
 446 /*******************************************************************************
 447  *
 448  * FUNCTION:    acpi_install_table_handler
 449  *
 450  * PARAMETERS:  handler         - Table event handler
 451  *              context         - Value passed to the handler on each event
 452  *
 453  * RETURN:      Status
 454  *
 455  * DESCRIPTION: Install a global table event handler.
 456  *
 457  ******************************************************************************/
 458 acpi_status
 459 acpi_install_table_handler(acpi_table_handler handler, void *context)
 460 {
 461         acpi_status status;
 462
 463         ACPI_FUNCTION_TRACE(acpi_install_table_handler);
 464
 465         if (!handler) {
 466                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 467         }
 468
 469         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 470         if (ACPI_FAILURE(status)) {
 471                 return_ACPI_STATUS(status);
 472         }
 473
 474         /* Don't allow more than one handler */
 475
 476         if (acpi_gbl_table_handler) {
 477                 status = AE_ALREADY_EXISTS;
 478                 goto cleanup;
 479         }
 480
 481         /* Install the handler */
 482
 483         acpi_gbl_table_handler = handler;
 484         acpi_gbl_table_handler_context = context;
 485
 486 cleanup:
 487         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 488         return_ACPI_STATUS(status);
 489 }
 490
 491 ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
 492
 493 /*******************************************************************************
 494  *
 495  * FUNCTION:    acpi_remove_table_handler
 496  *
 497  * PARAMETERS:  handler         - Table event handler that was installed
 498  *                                previously.
 499  *
 500  * RETURN:      Status
 501  *
 502  * DESCRIPTION: Remove a table event handler
 503  *
 504  ******************************************************************************/
 505 acpi_status acpi_remove_table_handler(acpi_table_handler handler)
 506 {
 507         acpi_status status;
 508
 509         ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
 510
 511         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 512         if (ACPI_FAILURE(status)) {
 513                 return_ACPI_STATUS(status);
 514         }
 515
 516         /* Make sure that the installed handler is the same */
 517
 518         if (!handler || handler != acpi_gbl_table_handler) {
 519                 status = AE_BAD_PARAMETER;
 520                 goto cleanup;
 521         }
 522
 523         /* Remove the handler */
 524
 525         acpi_gbl_table_handler = NULL;
 526
 527 cleanup:
 528         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 529         return_ACPI_STATUS(status);
 530 }
 531
 532 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)