Pileus Git - ~andy/linux/blob - drivers/acpi/acpica/utosi.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utosi - Support for the _OSI predefined control method
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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
  47 #define _COMPONENT          ACPI_UTILITIES
  48 ACPI_MODULE_NAME("utosi")
  49
  50 /*
  51  * Strings supported by the _OSI predefined control method (which is
  52  * implemented internally within this module.)
  53  *
  54  * March 2009: Removed "Linux" as this host no longer wants to respond true
  55  * for this string. Basically, the only safe OS strings are windows-related
  56  * and in many or most cases represent the only test path within the
  57  * BIOS-provided ASL code.
  58  *
  59  * The last element of each entry is used to track the newest version of
  60  * Windows that the BIOS has requested.
  61  */
  62 static struct acpi_interface_info acpi_default_supported_interfaces[] = {
  63         /* Operating System Vendor Strings */
  64
  65         {"Windows 2000", NULL, 0, ACPI_OSI_WIN_2000},   /* Windows 2000 */
  66         {"Windows 2001", NULL, 0, ACPI_OSI_WIN_XP},     /* Windows XP */
  67         {"Windows 2001 SP1", NULL, 0, ACPI_OSI_WIN_XP_SP1},     /* Windows XP SP1 */
  68         {"Windows 2001.1", NULL, 0, ACPI_OSI_WINSRV_2003},      /* Windows Server 2003 */
  69         {"Windows 2001 SP2", NULL, 0, ACPI_OSI_WIN_XP_SP2},     /* Windows XP SP2 */
  70         {"Windows 2001.1 SP1", NULL, 0, ACPI_OSI_WINSRV_2003_SP1},      /* Windows Server 2003 SP1 - Added 03/2006 */
  71         {"Windows 2006", NULL, 0, ACPI_OSI_WIN_VISTA},  /* Windows vista - Added 03/2006 */
  72         {"Windows 2006.1", NULL, 0, ACPI_OSI_WINSRV_2008},      /* Windows Server 2008 - Added 09/2009 */
  73         {"Windows 2006 SP1", NULL, 0, ACPI_OSI_WIN_VISTA_SP1},  /* Windows Vista SP1 - Added 09/2009 */
  74         {"Windows 2006 SP2", NULL, 0, ACPI_OSI_WIN_VISTA_SP2},  /* Windows Vista SP2 - Added 09/2010 */
  75         {"Windows 2009", NULL, 0, ACPI_OSI_WIN_7},      /* Windows 7 and Server 2008 R2 - Added 09/2009 */
  76         {"Windows 2012", NULL, 0, ACPI_OSI_WIN_8},      /* Windows 8 and Server 2012 - Added 08/2012 */
  77
  78         /* Feature Group Strings */
  79
  80         {"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0},
  81
  82         /*
  83          * All "optional" feature group strings (features that are implemented
  84          * by the host) should be dynamically modified to VALID by the host via
  85          * acpi_install_interface or acpi_update_interfaces. Such optional feature
  86          * group strings are set as INVALID by default here.
  87          */
  88
  89         {"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  90         {"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  91         {"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  92         {"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  93         {"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}
  94 };
  95
  96 /*******************************************************************************
  97  *
  98  * FUNCTION:    acpi_ut_initialize_interfaces
  99  *
 100  * PARAMETERS:  None
 101  *
 102  * RETURN:      Status
 103  *
 104  * DESCRIPTION: Initialize the global _OSI supported interfaces list
 105  *
 106  ******************************************************************************/
 107
 108 acpi_status acpi_ut_initialize_interfaces(void)
 109 {
 110         acpi_status status;
 111         u32 i;
 112
 113         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 114         if (ACPI_FAILURE(status)) {
 115                 return (status);
 116         }
 117
 118         acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
 119
 120         /* Link the static list of supported interfaces */
 121
 122         for (i = 0;
 123              i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
 124              i++) {
 125                 acpi_default_supported_interfaces[i].next =
 126                     &acpi_default_supported_interfaces[(acpi_size) i + 1];
 127         }
 128
 129         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 130         return (AE_OK);
 131 }
 132
 133 /*******************************************************************************
 134  *
 135  * FUNCTION:    acpi_ut_interface_terminate
 136  *
 137  * PARAMETERS:  None
 138  *
 139  * RETURN:      Status
 140  *
 141  * DESCRIPTION: Delete all interfaces in the global list. Sets
 142  *              acpi_gbl_supported_interfaces to NULL.
 143  *
 144  ******************************************************************************/
 145
 146 acpi_status acpi_ut_interface_terminate(void)
 147 {
 148         acpi_status status;
 149         struct acpi_interface_info *next_interface;
 150
 151         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 152         if (ACPI_FAILURE(status)) {
 153                 return (status);
 154         }
 155
 156         next_interface = acpi_gbl_supported_interfaces;
 157         while (next_interface) {
 158                 acpi_gbl_supported_interfaces = next_interface->next;
 159
 160                 if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 161
 162                         /* Only interfaces added at runtime can be freed */
 163
 164                         ACPI_FREE(next_interface->name);
 165                         ACPI_FREE(next_interface);
 166                 } else {
 167                         /* Interface is in static list. Reset it to invalid or valid. */
 168
 169                         if (next_interface->flags & ACPI_OSI_DEFAULT_INVALID) {
 170                                 next_interface->flags |= ACPI_OSI_INVALID;
 171                         } else {
 172                                 next_interface->flags &= ~ACPI_OSI_INVALID;
 173                         }
 174                 }
 175
 176                 next_interface = acpi_gbl_supported_interfaces;
 177         }
 178
 179         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 180         return (AE_OK);
 181 }
 182
 183 /*******************************************************************************
 184  *
 185  * FUNCTION:    acpi_ut_install_interface
 186  *
 187  * PARAMETERS:  interface_name      - The interface to install
 188  *
 189  * RETURN:      Status
 190  *
 191  * DESCRIPTION: Install the interface into the global interface list.
 192  *              Caller MUST hold acpi_gbl_osi_mutex
 193  *
 194  ******************************************************************************/
 195
 196 acpi_status acpi_ut_install_interface(acpi_string interface_name)
 197 {
 198         struct acpi_interface_info *interface_info;
 199
 200         /* Allocate info block and space for the name string */
 201
 202         interface_info =
 203             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
 204         if (!interface_info) {
 205                 return (AE_NO_MEMORY);
 206         }
 207
 208         interface_info->name =
 209             ACPI_ALLOCATE_ZEROED(ACPI_STRLEN(interface_name) + 1);
 210         if (!interface_info->name) {
 211                 ACPI_FREE(interface_info);
 212                 return (AE_NO_MEMORY);
 213         }
 214
 215         /* Initialize new info and insert at the head of the global list */
 216
 217         ACPI_STRCPY(interface_info->name, interface_name);
 218         interface_info->flags = ACPI_OSI_DYNAMIC;
 219         interface_info->next = acpi_gbl_supported_interfaces;
 220
 221         acpi_gbl_supported_interfaces = interface_info;
 222         return (AE_OK);
 223 }
 224
 225 /*******************************************************************************
 226  *
 227  * FUNCTION:    acpi_ut_remove_interface
 228  *
 229  * PARAMETERS:  interface_name      - The interface to remove
 230  *
 231  * RETURN:      Status
 232  *
 233  * DESCRIPTION: Remove the interface from the global interface list.
 234  *              Caller MUST hold acpi_gbl_osi_mutex
 235  *
 236  ******************************************************************************/
 237
 238 acpi_status acpi_ut_remove_interface(acpi_string interface_name)
 239 {
 240         struct acpi_interface_info *previous_interface;
 241         struct acpi_interface_info *next_interface;
 242
 243         previous_interface = next_interface = acpi_gbl_supported_interfaces;
 244         while (next_interface) {
 245                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 246
 247                         /* Found: name is in either the static list or was added at runtime */
 248
 249                         if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 250
 251                                 /* Interface was added dynamically, remove and free it */
 252
 253                                 if (previous_interface == next_interface) {
 254                                         acpi_gbl_supported_interfaces =
 255                                             next_interface->next;
 256                                 } else {
 257                                         previous_interface->next =
 258                                             next_interface->next;
 259                                 }
 260
 261                                 ACPI_FREE(next_interface->name);
 262                                 ACPI_FREE(next_interface);
 263                         } else {
 264                                 /*
 265                                  * Interface is in static list. If marked invalid, then it
 266                                  * does not actually exist. Else, mark it invalid.
 267                                  */
 268                                 if (next_interface->flags & ACPI_OSI_INVALID) {
 269                                         return (AE_NOT_EXIST);
 270                                 }
 271
 272                                 next_interface->flags |= ACPI_OSI_INVALID;
 273                         }
 274
 275                         return (AE_OK);
 276                 }
 277
 278                 previous_interface = next_interface;
 279                 next_interface = next_interface->next;
 280         }
 281
 282         /* Interface was not found */
 283
 284         return (AE_NOT_EXIST);
 285 }
 286
 287 /*******************************************************************************
 288  *
 289  * FUNCTION:    acpi_ut_update_interfaces
 290  *
 291  * PARAMETERS:  action              - Actions to be performed during the
 292  *                                    update
 293  *
 294  * RETURN:      Status
 295  *
 296  * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor
 297  *              strings or/and feature group strings.
 298  *              Caller MUST hold acpi_gbl_osi_mutex
 299  *
 300  ******************************************************************************/
 301
 302 acpi_status acpi_ut_update_interfaces(u8 action)
 303 {
 304         struct acpi_interface_info *next_interface;
 305
 306         next_interface = acpi_gbl_supported_interfaces;
 307         while (next_interface) {
 308                 if (((next_interface->flags & ACPI_OSI_FEATURE) &&
 309                      (action & ACPI_FEATURE_STRINGS)) ||
 310                     (!(next_interface->flags & ACPI_OSI_FEATURE) &&
 311                      (action & ACPI_VENDOR_STRINGS))) {
 312                         if (action & ACPI_DISABLE_INTERFACES) {
 313
 314                                 /* Mark the interfaces as invalid */
 315
 316                                 next_interface->flags |= ACPI_OSI_INVALID;
 317                         } else {
 318                                 /* Mark the interfaces as valid */
 319
 320                                 next_interface->flags &= ~ACPI_OSI_INVALID;
 321                         }
 322                 }
 323
 324                 next_interface = next_interface->next;
 325         }
 326
 327         return (AE_OK);
 328 }
 329
 330 /*******************************************************************************
 331  *
 332  * FUNCTION:    acpi_ut_get_interface
 333  *
 334  * PARAMETERS:  interface_name      - The interface to find
 335  *
 336  * RETURN:      struct acpi_interface_info if found. NULL if not found.
 337  *
 338  * DESCRIPTION: Search for the specified interface name in the global list.
 339  *              Caller MUST hold acpi_gbl_osi_mutex
 340  *
 341  ******************************************************************************/
 342
 343 struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
 344 {
 345         struct acpi_interface_info *next_interface;
 346
 347         next_interface = acpi_gbl_supported_interfaces;
 348         while (next_interface) {
 349                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 350                         return (next_interface);
 351                 }
 352
 353                 next_interface = next_interface->next;
 354         }
 355
 356         return (NULL);
 357 }
 358
 359 /*******************************************************************************
 360  *
 361  * FUNCTION:    acpi_ut_osi_implementation
 362  *
 363  * PARAMETERS:  walk_state          - Current walk state
 364  *
 365  * RETURN:      Status
 366  *
 367  * DESCRIPTION: Implementation of the _OSI predefined control method. When
 368  *              an invocation of _OSI is encountered in the system AML,
 369  *              control is transferred to this function.
 370  *
 371  ******************************************************************************/
 372
 373 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)
 374 {
 375         union acpi_operand_object *string_desc;
 376         union acpi_operand_object *return_desc;
 377         struct acpi_interface_info *interface_info;
 378         acpi_interface_handler interface_handler;
 379         acpi_status status;
 380         u32 return_value;
 381
 382         ACPI_FUNCTION_TRACE(ut_osi_implementation);
 383
 384         /* Validate the string input argument (from the AML caller) */
 385
 386         string_desc = walk_state->arguments[0].object;
 387         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
 388                 return_ACPI_STATUS(AE_TYPE);
 389         }
 390
 391         /* Create a return object */
 392
 393         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 394         if (!return_desc) {
 395                 return_ACPI_STATUS(AE_NO_MEMORY);
 396         }
 397
 398         /* Default return value is 0, NOT SUPPORTED */
 399
 400         return_value = 0;
 401         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 402         if (ACPI_FAILURE(status)) {
 403                 acpi_ut_remove_reference(return_desc);
 404                 return_ACPI_STATUS(status);
 405         }
 406
 407         /* Lookup the interface in the global _OSI list */
 408
 409         interface_info = acpi_ut_get_interface(string_desc->string.pointer);
 410         if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
 411                 /*
 412                  * The interface is supported.
 413                  * Update the osi_data if necessary. We keep track of the latest
 414                  * version of Windows that has been requested by the BIOS.
 415                  */
 416                 if (interface_info->value > acpi_gbl_osi_data) {
 417                         acpi_gbl_osi_data = interface_info->value;
 418                 }
 419
 420                 return_value = ACPI_UINT32_MAX;
 421         }
 422
 423         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 424
 425         /*
 426          * Invoke an optional _OSI interface handler. The host OS may wish
 427          * to do some interface-specific handling. For example, warn about
 428          * certain interfaces or override the true/false support value.
 429          */
 430         interface_handler = acpi_gbl_interface_handler;
 431         if (interface_handler) {
 432                 return_value =
 433                     interface_handler(string_desc->string.pointer,
 434                                       return_value);
 435         }
 436
 437         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
 438                               "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
 439                               string_desc->string.pointer,
 440                               return_value == 0 ? "not " : ""));
 441
 442         /* Complete the return object */
 443
 444         return_desc->integer.value = return_value;
 445         walk_state->return_desc = return_desc;
 446         return_ACPI_STATUS(AE_OK);
 447 }