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         {"Windows 2013", NULL, 0, ACPI_OSI_WIN_8},      /* Windows 8.1 and Server 2012 R2 - Added 01/2014 */
  78
  79         /* Feature Group Strings */
  80
  81         {"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0},
  82
  83         /*
  84          * All "optional" feature group strings (features that are implemented
  85          * by the host) should be dynamically modified to VALID by the host via
  86          * acpi_install_interface or acpi_update_interfaces. Such optional feature
  87          * group strings are set as INVALID by default here.
  88          */
  89
  90         {"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  91         {"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  92         {"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  93         {"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  94         {"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}
  95 };
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    acpi_ut_initialize_interfaces
 100  *
 101  * PARAMETERS:  None
 102  *
 103  * RETURN:      Status
 104  *
 105  * DESCRIPTION: Initialize the global _OSI supported interfaces list
 106  *
 107  ******************************************************************************/
 108
 109 acpi_status acpi_ut_initialize_interfaces(void)
 110 {
 111         acpi_status status;
 112         u32 i;
 113
 114         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 115         if (ACPI_FAILURE(status)) {
 116                 return (status);
 117         }
 118
 119         acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
 120
 121         /* Link the static list of supported interfaces */
 122
 123         for (i = 0;
 124              i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
 125              i++) {
 126                 acpi_default_supported_interfaces[i].next =
 127                     &acpi_default_supported_interfaces[(acpi_size) i + 1];
 128         }
 129
 130         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 131         return (AE_OK);
 132 }
 133
 134 /*******************************************************************************
 135  *
 136  * FUNCTION:    acpi_ut_interface_terminate
 137  *
 138  * PARAMETERS:  None
 139  *
 140  * RETURN:      Status
 141  *
 142  * DESCRIPTION: Delete all interfaces in the global list. Sets
 143  *              acpi_gbl_supported_interfaces to NULL.
 144  *
 145  ******************************************************************************/
 146
 147 acpi_status acpi_ut_interface_terminate(void)
 148 {
 149         acpi_status status;
 150         struct acpi_interface_info *next_interface;
 151
 152         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 153         if (ACPI_FAILURE(status)) {
 154                 return (status);
 155         }
 156
 157         next_interface = acpi_gbl_supported_interfaces;
 158         while (next_interface) {
 159                 acpi_gbl_supported_interfaces = next_interface->next;
 160
 161                 if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 162
 163                         /* Only interfaces added at runtime can be freed */
 164
 165                         ACPI_FREE(next_interface->name);
 166                         ACPI_FREE(next_interface);
 167                 } else {
 168                         /* Interface is in static list. Reset it to invalid or valid. */
 169
 170                         if (next_interface->flags & ACPI_OSI_DEFAULT_INVALID) {
 171                                 next_interface->flags |= ACPI_OSI_INVALID;
 172                         } else {
 173                                 next_interface->flags &= ~ACPI_OSI_INVALID;
 174                         }
 175                 }
 176
 177                 next_interface = acpi_gbl_supported_interfaces;
 178         }
 179
 180         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 181         return (AE_OK);
 182 }
 183
 184 /*******************************************************************************
 185  *
 186  * FUNCTION:    acpi_ut_install_interface
 187  *
 188  * PARAMETERS:  interface_name      - The interface to install
 189  *
 190  * RETURN:      Status
 191  *
 192  * DESCRIPTION: Install the interface into the global interface list.
 193  *              Caller MUST hold acpi_gbl_osi_mutex
 194  *
 195  ******************************************************************************/
 196
 197 acpi_status acpi_ut_install_interface(acpi_string interface_name)
 198 {
 199         struct acpi_interface_info *interface_info;
 200
 201         /* Allocate info block and space for the name string */
 202
 203         interface_info =
 204             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
 205         if (!interface_info) {
 206                 return (AE_NO_MEMORY);
 207         }
 208
 209         interface_info->name =
 210             ACPI_ALLOCATE_ZEROED(ACPI_STRLEN(interface_name) + 1);
 211         if (!interface_info->name) {
 212                 ACPI_FREE(interface_info);
 213                 return (AE_NO_MEMORY);
 214         }
 215
 216         /* Initialize new info and insert at the head of the global list */
 217
 218         ACPI_STRCPY(interface_info->name, interface_name);
 219         interface_info->flags = ACPI_OSI_DYNAMIC;
 220         interface_info->next = acpi_gbl_supported_interfaces;
 221
 222         acpi_gbl_supported_interfaces = interface_info;
 223         return (AE_OK);
 224 }
 225
 226 /*******************************************************************************
 227  *
 228  * FUNCTION:    acpi_ut_remove_interface
 229  *
 230  * PARAMETERS:  interface_name      - The interface to remove
 231  *
 232  * RETURN:      Status
 233  *
 234  * DESCRIPTION: Remove the interface from the global interface list.
 235  *              Caller MUST hold acpi_gbl_osi_mutex
 236  *
 237  ******************************************************************************/
 238
 239 acpi_status acpi_ut_remove_interface(acpi_string interface_name)
 240 {
 241         struct acpi_interface_info *previous_interface;
 242         struct acpi_interface_info *next_interface;
 243
 244         previous_interface = next_interface = acpi_gbl_supported_interfaces;
 245         while (next_interface) {
 246                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 247
 248                         /* Found: name is in either the static list or was added at runtime */
 249
 250                         if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 251
 252                                 /* Interface was added dynamically, remove and free it */
 253
 254                                 if (previous_interface == next_interface) {
 255                                         acpi_gbl_supported_interfaces =
 256                                             next_interface->next;
 257                                 } else {
 258                                         previous_interface->next =
 259                                             next_interface->next;
 260                                 }
 261
 262                                 ACPI_FREE(next_interface->name);
 263                                 ACPI_FREE(next_interface);
 264                         } else {
 265                                 /*
 266                                  * Interface is in static list. If marked invalid, then it
 267                                  * does not actually exist. Else, mark it invalid.
 268                                  */
 269                                 if (next_interface->flags & ACPI_OSI_INVALID) {
 270                                         return (AE_NOT_EXIST);
 271                                 }
 272
 273                                 next_interface->flags |= ACPI_OSI_INVALID;
 274                         }
 275
 276                         return (AE_OK);
 277                 }
 278
 279                 previous_interface = next_interface;
 280                 next_interface = next_interface->next;
 281         }
 282
 283         /* Interface was not found */
 284
 285         return (AE_NOT_EXIST);
 286 }
 287
 288 /*******************************************************************************
 289  *
 290  * FUNCTION:    acpi_ut_update_interfaces
 291  *
 292  * PARAMETERS:  action              - Actions to be performed during the
 293  *                                    update
 294  *
 295  * RETURN:      Status
 296  *
 297  * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor
 298  *              strings or/and feature group strings.
 299  *              Caller MUST hold acpi_gbl_osi_mutex
 300  *
 301  ******************************************************************************/
 302
 303 acpi_status acpi_ut_update_interfaces(u8 action)
 304 {
 305         struct acpi_interface_info *next_interface;
 306
 307         next_interface = acpi_gbl_supported_interfaces;
 308         while (next_interface) {
 309                 if (((next_interface->flags & ACPI_OSI_FEATURE) &&
 310                      (action & ACPI_FEATURE_STRINGS)) ||
 311                     (!(next_interface->flags & ACPI_OSI_FEATURE) &&
 312                      (action & ACPI_VENDOR_STRINGS))) {
 313                         if (action & ACPI_DISABLE_INTERFACES) {
 314
 315                                 /* Mark the interfaces as invalid */
 316
 317                                 next_interface->flags |= ACPI_OSI_INVALID;
 318                         } else {
 319                                 /* Mark the interfaces as valid */
 320
 321                                 next_interface->flags &= ~ACPI_OSI_INVALID;
 322                         }
 323                 }
 324
 325                 next_interface = next_interface->next;
 326         }
 327
 328         return (AE_OK);
 329 }
 330
 331 /*******************************************************************************
 332  *
 333  * FUNCTION:    acpi_ut_get_interface
 334  *
 335  * PARAMETERS:  interface_name      - The interface to find
 336  *
 337  * RETURN:      struct acpi_interface_info if found. NULL if not found.
 338  *
 339  * DESCRIPTION: Search for the specified interface name in the global list.
 340  *              Caller MUST hold acpi_gbl_osi_mutex
 341  *
 342  ******************************************************************************/
 343
 344 struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
 345 {
 346         struct acpi_interface_info *next_interface;
 347
 348         next_interface = acpi_gbl_supported_interfaces;
 349         while (next_interface) {
 350                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 351                         return (next_interface);
 352                 }
 353
 354                 next_interface = next_interface->next;
 355         }
 356
 357         return (NULL);
 358 }
 359
 360 /*******************************************************************************
 361  *
 362  * FUNCTION:    acpi_ut_osi_implementation
 363  *
 364  * PARAMETERS:  walk_state          - Current walk state
 365  *
 366  * RETURN:      Status
 367  *
 368  * DESCRIPTION: Implementation of the _OSI predefined control method. When
 369  *              an invocation of _OSI is encountered in the system AML,
 370  *              control is transferred to this function.
 371  *
 372  ******************************************************************************/
 373
 374 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)
 375 {
 376         union acpi_operand_object *string_desc;
 377         union acpi_operand_object *return_desc;
 378         struct acpi_interface_info *interface_info;
 379         acpi_interface_handler interface_handler;
 380         acpi_status status;
 381         u32 return_value;
 382
 383         ACPI_FUNCTION_TRACE(ut_osi_implementation);
 384
 385         /* Validate the string input argument (from the AML caller) */
 386
 387         string_desc = walk_state->arguments[0].object;
 388         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
 389                 return_ACPI_STATUS(AE_TYPE);
 390         }
 391
 392         /* Create a return object */
 393
 394         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 395         if (!return_desc) {
 396                 return_ACPI_STATUS(AE_NO_MEMORY);
 397         }
 398
 399         /* Default return value is 0, NOT SUPPORTED */
 400
 401         return_value = 0;
 402         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 403         if (ACPI_FAILURE(status)) {
 404                 acpi_ut_remove_reference(return_desc);
 405                 return_ACPI_STATUS(status);
 406         }
 407
 408         /* Lookup the interface in the global _OSI list */
 409
 410         interface_info = acpi_ut_get_interface(string_desc->string.pointer);
 411         if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
 412                 /*
 413                  * The interface is supported.
 414                  * Update the osi_data if necessary. We keep track of the latest
 415                  * version of Windows that has been requested by the BIOS.
 416                  */
 417                 if (interface_info->value > acpi_gbl_osi_data) {
 418                         acpi_gbl_osi_data = interface_info->value;
 419                 }
 420
 421                 return_value = ACPI_UINT32_MAX;
 422         }
 423
 424         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 425
 426         /*
 427          * Invoke an optional _OSI interface handler. The host OS may wish
 428          * to do some interface-specific handling. For example, warn about
 429          * certain interfaces or override the true/false support value.
 430          */
 431         interface_handler = acpi_gbl_interface_handler;
 432         if (interface_handler) {
 433                 return_value =
 434                     interface_handler(string_desc->string.pointer,
 435                                       return_value);
 436         }
 437
 438         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
 439                               "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
 440                               string_desc->string.pointer,
 441                               return_value == 0 ? "not " : ""));
 442
 443         /* Complete the return object */
 444
 445         return_desc->integer.value = return_value;
 446         walk_state->return_desc = return_desc;
 447         return_ACPI_STATUS(AE_OK);
 448 }