kernel/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 - 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 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46
  47 #define _COMPONENT          ACPI_UTILITIES
  48 ACPI_MODULE_NAME("utosi")
  49
  50 /******************************************************************************
  51  *
  52  * ACPICA policy for new _OSI strings:
  53  *
  54  * It is the stated policy of ACPICA that new _OSI strings will be integrated
  55  * into this module as soon as possible after they are defined. It is strongly
  56  * recommended that all ACPICA hosts mirror this policy and integrate any
  57  * changes to this module as soon as possible. There are several historical
  58  * reasons behind this policy:
  59  *
  60  * 1) New BIOSs tend to test only the case where the host responds TRUE to
  61  *    the latest version of Windows, which would respond to the latest/newest
  62  *    _OSI string. Not responding TRUE to the latest version of Windows will
  63  *    risk executing untested code paths throughout the DSDT and SSDTs.
  64  *
  65  * 2) If a new _OSI string is recognized only after a significant delay, this
  66  *    has the potential to cause problems on existing working machines because
  67  *    of the possibility that a new and different path through the ASL code
  68  *    will be executed.
  69  *
  70  * 3) New _OSI strings are tending to come out about once per year. A delay
  71  *    in recognizing a new string for a significant amount of time risks the
  72  *    release of another string which only compounds the initial problem.
  73  *
  74  *****************************************************************************/
  75 /*
  76  * Strings supported by the _OSI predefined control method (which is
  77  * implemented internally within this module.)
  78  *
  79  * March 2009: Removed "Linux" as this host no longer wants to respond true
  80  * for this string. Basically, the only safe OS strings are windows-related
  81  * and in many or most cases represent the only test path within the
  82  * BIOS-provided ASL code.
  83  *
  84  * The last element of each entry is used to track the newest version of
  85  * Windows that the BIOS has requested.
  86  */
  87 static struct acpi_interface_info acpi_default_supported_interfaces[] = {
  88         /* Operating System Vendor Strings */
  89
  90         {"Windows 2000", NULL, 0, ACPI_OSI_WIN_2000},   /* Windows 2000 */
  91         {"Windows 2001", NULL, 0, ACPI_OSI_WIN_XP},     /* Windows XP */
  92         {"Windows 2001 SP1", NULL, 0, ACPI_OSI_WIN_XP_SP1},     /* Windows XP SP1 */
  93         {"Windows 2001.1", NULL, 0, ACPI_OSI_WINSRV_2003},      /* Windows Server 2003 */
  94         {"Windows 2001 SP2", NULL, 0, ACPI_OSI_WIN_XP_SP2},     /* Windows XP SP2 */
  95         {"Windows 2001.1 SP1", NULL, 0, ACPI_OSI_WINSRV_2003_SP1},      /* Windows Server 2003 SP1 - Added 03/2006 */
  96         {"Windows 2006", NULL, 0, ACPI_OSI_WIN_VISTA},  /* Windows vista - Added 03/2006 */
  97         {"Windows 2006.1", NULL, 0, ACPI_OSI_WINSRV_2008},      /* Windows Server 2008 - Added 09/2009 */
  98         {"Windows 2006 SP1", NULL, 0, ACPI_OSI_WIN_VISTA_SP1},  /* Windows Vista SP1 - Added 09/2009 */
  99         {"Windows 2006 SP2", NULL, 0, ACPI_OSI_WIN_VISTA_SP2},  /* Windows Vista SP2 - Added 09/2010 */
 100         {"Windows 2009", NULL, 0, ACPI_OSI_WIN_7},      /* Windows 7 and Server 2008 R2 - Added 09/2009 */
 101         {"Windows 2012", NULL, 0, ACPI_OSI_WIN_8},      /* Windows 8 and Server 2012 - Added 08/2012 */
 102         {"Windows 2013", NULL, 0, ACPI_OSI_WIN_8},      /* Windows 8.1 and Server 2012 R2 - Added 01/2014 */
 103         {"Windows 2015", NULL, 0, ACPI_OSI_WIN_10},     /* Windows 10 - Added 03/2015 */
 104
 105         /* Feature Group Strings */
 106
 107         {"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0},
 108
 109         /*
 110          * All "optional" feature group strings (features that are implemented
 111          * by the host) should be dynamically modified to VALID by the host via
 112          * acpi_install_interface or acpi_update_interfaces. Such optional feature
 113          * group strings are set as INVALID by default here.
 114          */
 115
 116         {"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
 117         {"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
 118         {"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
 119         {"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
 120         {"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}
 121 };
 122
 123 /*******************************************************************************
 124  *
 125  * FUNCTION:    acpi_ut_initialize_interfaces
 126  *
 127  * PARAMETERS:  None
 128  *
 129  * RETURN:      Status
 130  *
 131  * DESCRIPTION: Initialize the global _OSI supported interfaces list
 132  *
 133  ******************************************************************************/
 134
 135 acpi_status acpi_ut_initialize_interfaces(void)
 136 {
 137         acpi_status status;
 138         u32 i;
 139
 140         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 141         if (ACPI_FAILURE(status)) {
 142                 return (status);
 143         }
 144
 145         acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
 146
 147         /* Link the static list of supported interfaces */
 148
 149         for (i = 0;
 150              i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
 151              i++) {
 152                 acpi_default_supported_interfaces[i].next =
 153                     &acpi_default_supported_interfaces[(acpi_size) i + 1];
 154         }
 155
 156         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 157         return (AE_OK);
 158 }
 159
 160 /*******************************************************************************
 161  *
 162  * FUNCTION:    acpi_ut_interface_terminate
 163  *
 164  * PARAMETERS:  None
 165  *
 166  * RETURN:      Status
 167  *
 168  * DESCRIPTION: Delete all interfaces in the global list. Sets
 169  *              acpi_gbl_supported_interfaces to NULL.
 170  *
 171  ******************************************************************************/
 172
 173 acpi_status acpi_ut_interface_terminate(void)
 174 {
 175         acpi_status status;
 176         struct acpi_interface_info *next_interface;
 177
 178         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 179         if (ACPI_FAILURE(status)) {
 180                 return (status);
 181         }
 182
 183         next_interface = acpi_gbl_supported_interfaces;
 184         while (next_interface) {
 185                 acpi_gbl_supported_interfaces = next_interface->next;
 186
 187                 if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 188
 189                         /* Only interfaces added at runtime can be freed */
 190
 191                         ACPI_FREE(next_interface->name);
 192                         ACPI_FREE(next_interface);
 193                 } else {
 194                         /* Interface is in static list. Reset it to invalid or valid. */
 195
 196                         if (next_interface->flags & ACPI_OSI_DEFAULT_INVALID) {
 197                                 next_interface->flags |= ACPI_OSI_INVALID;
 198                         } else {
 199                                 next_interface->flags &= ~ACPI_OSI_INVALID;
 200                         }
 201                 }
 202
 203                 next_interface = acpi_gbl_supported_interfaces;
 204         }
 205
 206         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 207         return (AE_OK);
 208 }
 209
 210 /*******************************************************************************
 211  *
 212  * FUNCTION:    acpi_ut_install_interface
 213  *
 214  * PARAMETERS:  interface_name      - The interface to install
 215  *
 216  * RETURN:      Status
 217  *
 218  * DESCRIPTION: Install the interface into the global interface list.
 219  *              Caller MUST hold acpi_gbl_osi_mutex
 220  *
 221  ******************************************************************************/
 222
 223 acpi_status acpi_ut_install_interface(acpi_string interface_name)
 224 {
 225         struct acpi_interface_info *interface_info;
 226
 227         /* Allocate info block and space for the name string */
 228
 229         interface_info =
 230             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
 231         if (!interface_info) {
 232                 return (AE_NO_MEMORY);
 233         }
 234
 235         interface_info->name =
 236             ACPI_ALLOCATE_ZEROED(ACPI_STRLEN(interface_name) + 1);
 237         if (!interface_info->name) {
 238                 ACPI_FREE(interface_info);
 239                 return (AE_NO_MEMORY);
 240         }
 241
 242         /* Initialize new info and insert at the head of the global list */
 243
 244         ACPI_STRCPY(interface_info->name, interface_name);
 245         interface_info->flags = ACPI_OSI_DYNAMIC;
 246         interface_info->next = acpi_gbl_supported_interfaces;
 247
 248         acpi_gbl_supported_interfaces = interface_info;
 249         return (AE_OK);
 250 }
 251
 252 /*******************************************************************************
 253  *
 254  * FUNCTION:    acpi_ut_remove_interface
 255  *
 256  * PARAMETERS:  interface_name      - The interface to remove
 257  *
 258  * RETURN:      Status
 259  *
 260  * DESCRIPTION: Remove the interface from the global interface list.
 261  *              Caller MUST hold acpi_gbl_osi_mutex
 262  *
 263  ******************************************************************************/
 264
 265 acpi_status acpi_ut_remove_interface(acpi_string interface_name)
 266 {
 267         struct acpi_interface_info *previous_interface;
 268         struct acpi_interface_info *next_interface;
 269
 270         previous_interface = next_interface = acpi_gbl_supported_interfaces;
 271         while (next_interface) {
 272                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 273
 274                         /* Found: name is in either the static list or was added at runtime */
 275
 276                         if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 277
 278                                 /* Interface was added dynamically, remove and free it */
 279
 280                                 if (previous_interface == next_interface) {
 281                                         acpi_gbl_supported_interfaces =
 282                                             next_interface->next;
 283                                 } else {
 284                                         previous_interface->next =
 285                                             next_interface->next;
 286                                 }
 287
 288                                 ACPI_FREE(next_interface->name);
 289                                 ACPI_FREE(next_interface);
 290                         } else {
 291                                 /*
 292                                  * Interface is in static list. If marked invalid, then it
 293                                  * does not actually exist. Else, mark it invalid.
 294                                  */
 295                                 if (next_interface->flags & ACPI_OSI_INVALID) {
 296                                         return (AE_NOT_EXIST);
 297                                 }
 298
 299                                 next_interface->flags |= ACPI_OSI_INVALID;
 300                         }
 301
 302                         return (AE_OK);
 303                 }
 304
 305                 previous_interface = next_interface;
 306                 next_interface = next_interface->next;
 307         }
 308
 309         /* Interface was not found */
 310
 311         return (AE_NOT_EXIST);
 312 }
 313
 314 /*******************************************************************************
 315  *
 316  * FUNCTION:    acpi_ut_update_interfaces
 317  *
 318  * PARAMETERS:  action              - Actions to be performed during the
 319  *                                    update
 320  *
 321  * RETURN:      Status
 322  *
 323  * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor
 324  *              strings or/and feature group strings.
 325  *              Caller MUST hold acpi_gbl_osi_mutex
 326  *
 327  ******************************************************************************/
 328
 329 acpi_status acpi_ut_update_interfaces(u8 action)
 330 {
 331         struct acpi_interface_info *next_interface;
 332
 333         next_interface = acpi_gbl_supported_interfaces;
 334         while (next_interface) {
 335                 if (((next_interface->flags & ACPI_OSI_FEATURE) &&
 336                      (action & ACPI_FEATURE_STRINGS)) ||
 337                     (!(next_interface->flags & ACPI_OSI_FEATURE) &&
 338                      (action & ACPI_VENDOR_STRINGS))) {
 339                         if (action & ACPI_DISABLE_INTERFACES) {
 340
 341                                 /* Mark the interfaces as invalid */
 342
 343                                 next_interface->flags |= ACPI_OSI_INVALID;
 344                         } else {
 345                                 /* Mark the interfaces as valid */
 346
 347                                 next_interface->flags &= ~ACPI_OSI_INVALID;
 348                         }
 349                 }
 350
 351                 next_interface = next_interface->next;
 352         }
 353
 354         return (AE_OK);
 355 }
 356
 357 /*******************************************************************************
 358  *
 359  * FUNCTION:    acpi_ut_get_interface
 360  *
 361  * PARAMETERS:  interface_name      - The interface to find
 362  *
 363  * RETURN:      struct acpi_interface_info if found. NULL if not found.
 364  *
 365  * DESCRIPTION: Search for the specified interface name in the global list.
 366  *              Caller MUST hold acpi_gbl_osi_mutex
 367  *
 368  ******************************************************************************/
 369
 370 struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
 371 {
 372         struct acpi_interface_info *next_interface;
 373
 374         next_interface = acpi_gbl_supported_interfaces;
 375         while (next_interface) {
 376                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 377                         return (next_interface);
 378                 }
 379
 380                 next_interface = next_interface->next;
 381         }
 382
 383         return (NULL);
 384 }
 385
 386 /*******************************************************************************
 387  *
 388  * FUNCTION:    acpi_ut_osi_implementation
 389  *
 390  * PARAMETERS:  walk_state          - Current walk state
 391  *
 392  * RETURN:      Status
 393  *
 394  * DESCRIPTION: Implementation of the _OSI predefined control method. When
 395  *              an invocation of _OSI is encountered in the system AML,
 396  *              control is transferred to this function.
 397  *
 398  ******************************************************************************/
 399
 400 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)
 401 {
 402         union acpi_operand_object *string_desc;
 403         union acpi_operand_object *return_desc;
 404         struct acpi_interface_info *interface_info;
 405         acpi_interface_handler interface_handler;
 406         acpi_status status;
 407         u32 return_value;
 408
 409         ACPI_FUNCTION_TRACE(ut_osi_implementation);
 410
 411         /* Validate the string input argument (from the AML caller) */
 412
 413         string_desc = walk_state->arguments[0].object;
 414         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
 415                 return_ACPI_STATUS(AE_TYPE);
 416         }
 417
 418         /* Create a return object */
 419
 420         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 421         if (!return_desc) {
 422                 return_ACPI_STATUS(AE_NO_MEMORY);
 423         }
 424
 425         /* Default return value is 0, NOT SUPPORTED */
 426
 427         return_value = 0;
 428         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 429         if (ACPI_FAILURE(status)) {
 430                 acpi_ut_remove_reference(return_desc);
 431                 return_ACPI_STATUS(status);
 432         }
 433
 434         /* Lookup the interface in the global _OSI list */
 435
 436         interface_info = acpi_ut_get_interface(string_desc->string.pointer);
 437         if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
 438                 /*
 439                  * The interface is supported.
 440                  * Update the osi_data if necessary. We keep track of the latest
 441                  * version of Windows that has been requested by the BIOS.
 442                  */
 443                 if (interface_info->value > acpi_gbl_osi_data) {
 444                         acpi_gbl_osi_data = interface_info->value;
 445                 }
 446
 447                 return_value = ACPI_UINT32_MAX;
 448         }
 449
 450         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 451
 452         /*
 453          * Invoke an optional _OSI interface handler. The host OS may wish
 454          * to do some interface-specific handling. For example, warn about
 455          * certain interfaces or override the true/false support value.
 456          */
 457         interface_handler = acpi_gbl_interface_handler;
 458         if (interface_handler) {
 459                 return_value =
 460                     interface_handler(string_desc->string.pointer,
 461                                       return_value);
 462         }
 463
 464         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
 465                               "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
 466                               string_desc->string.pointer,
 467                               return_value == 0 ? "not " : ""));
 468
 469         /* Complete the return object */
 470
 471         return_desc->integer.value = return_value;
 472         walk_state->return_desc = return_desc;
 473         return_ACPI_STATUS(AE_OK);
 474 }