drivers/acpi/osi.c

   1 /*
   2  *  osi.c - _OSI implementation
   3  *
   4  *  Copyright (C) 2016 Intel Corporation
   5  *    Author: Lv Zheng <lv.zheng@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  20  */
  21
  22 /* Uncomment next line to get verbose printout */
  23 /* #define DEBUG */
  24 #define pr_fmt(fmt) "ACPI: " fmt
  25
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28 #include <linux/acpi.h>
  29 #include <linux/dmi.h>
  30
  31 #include "internal.h"
  32
  33
  34 #define OSI_STRING_LENGTH_MAX   64
  35 #define OSI_STRING_ENTRIES_MAX  16
  36
  37 struct acpi_osi_entry {
  38         char string[OSI_STRING_LENGTH_MAX];
  39         bool enable;
  40 };
  41
  42 static struct acpi_osi_config {
  43         u8              default_disabling;
  44         unsigned int    linux_enable:1;
  45         unsigned int    linux_dmi:1;
  46         unsigned int    linux_cmdline:1;
  47         unsigned int    darwin_enable:1;
  48         unsigned int    darwin_dmi:1;
  49         unsigned int    darwin_cmdline:1;
  50 } osi_config;
  51
  52 static struct acpi_osi_config osi_config;
  53 static struct acpi_osi_entry
  54 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
  55         {"Module Device", true},
  56         {"Processor Device", true},
  57         {"3.0 _SCP Extensions", true},
  58         {"Processor Aggregator Device", true},
  59 };
  60
  61 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
  62 {
  63         if (!strcmp("Linux", interface)) {
  64                 pr_notice_once(FW_BUG
  65                         "BIOS _OSI(Linux) query %s%s\n",
  66                         osi_config.linux_enable ? "honored" : "ignored",
  67                         osi_config.linux_cmdline ? " via cmdline" :
  68                         osi_config.linux_dmi ? " via DMI" : "");
  69         }
  70         if (!strcmp("Darwin", interface)) {
  71                 pr_notice_once(
  72                         "BIOS _OSI(Darwin) query %s%s\n",
  73                         osi_config.darwin_enable ? "honored" : "ignored",
  74                         osi_config.darwin_cmdline ? " via cmdline" :
  75                         osi_config.darwin_dmi ? " via DMI" : "");
  76         }
  77
  78         return supported;
  79 }
  80
  81 void __init acpi_osi_setup(char *str)
  82 {
  83         struct acpi_osi_entry *osi;
  84         bool enable = true;
  85         int i;
  86
  87         if (!acpi_gbl_create_osi_method)
  88                 return;
  89
  90         if (str == NULL || *str == '\0') {
  91                 pr_info("_OSI method disabled\n");
  92                 acpi_gbl_create_osi_method = FALSE;
  93                 return;
  94         }
  95
  96         if (*str == '!') {
  97                 str++;
  98                 if (*str == '\0') {
  99                         /* Do not override acpi_osi=!* */
 100                         if (!osi_config.default_disabling)
 101                                 osi_config.default_disabling =
 102                                         ACPI_DISABLE_ALL_VENDOR_STRINGS;
 103                         return;
 104                 } else if (*str == '*') {
 105                         osi_config.default_disabling = ACPI_DISABLE_ALL_STRINGS;
 106                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
 107                                 osi = &osi_setup_entries[i];
 108                                 osi->enable = false;
 109                         }
 110                         return;
 111                 } else if (*str == '!') {
 112                         osi_config.default_disabling = 0;
 113                         return;
 114                 }
 115                 enable = false;
 116         }
 117
 118         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
 119                 osi = &osi_setup_entries[i];
 120                 if (!strcmp(osi->string, str)) {
 121                         osi->enable = enable;
 122                         break;
 123                 } else if (osi->string[0] == '\0') {
 124                         osi->enable = enable;
 125                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
 126                         break;
 127                 }
 128         }
 129 }
 130
 131 static void __init __acpi_osi_setup_darwin(bool enable)
 132 {
 133         osi_config.darwin_enable = !!enable;
 134         if (enable) {
 135                 acpi_osi_setup("!");
 136                 acpi_osi_setup("Darwin");
 137         } else {
 138                 acpi_osi_setup("!!");
 139                 acpi_osi_setup("!Darwin");
 140         }
 141 }
 142
 143 static void __init acpi_osi_setup_darwin(bool enable)
 144 {
 145         /* Override acpi_osi_dmi_blacklisted() */
 146         osi_config.darwin_dmi = 0;
 147         osi_config.darwin_cmdline = 1;
 148         __acpi_osi_setup_darwin(enable);
 149 }
 150
 151 /*
 152  * The story of _OSI(Linux)
 153  *
 154  * From pre-history through Linux-2.6.22, Linux responded TRUE upon a BIOS
 155  * OSI(Linux) query.
 156  *
 157  * Unfortunately, reference BIOS writers got wind of this and put
 158  * OSI(Linux) in their example code, quickly exposing this string as
 159  * ill-conceived and opening the door to an un-bounded number of BIOS
 160  * incompatibilities.
 161  *
 162  * For example, OSI(Linux) was used on resume to re-POST a video card on
 163  * one system, because Linux at that time could not do a speedy restore in
 164  * its native driver. But then upon gaining quick native restore
 165  * capability, Linux has no way to tell the BIOS to skip the time-consuming
 166  * POST -- putting Linux at a permanent performance disadvantage. On
 167  * another system, the BIOS writer used OSI(Linux) to infer native OS
 168  * support for IPMI!  On other systems, OSI(Linux) simply got in the way of
 169  * Linux claiming to be compatible with other operating systems, exposing
 170  * BIOS issues such as skipped device initialization.
 171  *
 172  * So "Linux" turned out to be a really poor chose of OSI string, and from
 173  * Linux-2.6.23 onward we respond FALSE.
 174  *
 175  * BIOS writers should NOT query _OSI(Linux) on future systems. Linux will
 176  * complain on the console when it sees it, and return FALSE. To get Linux
 177  * to return TRUE for your system  will require a kernel source update to
 178  * add a DMI entry, or boot with "acpi_osi=Linux"
 179  */
 180 static void __init __acpi_osi_setup_linux(bool enable)
 181 {
 182         osi_config.linux_enable = !!enable;
 183         if (enable)
 184                 acpi_osi_setup("Linux");
 185         else
 186                 acpi_osi_setup("!Linux");
 187 }
 188
 189 static void __init acpi_osi_setup_linux(bool enable)
 190 {
 191         /* Override acpi_osi_dmi_blacklisted() */
 192         osi_config.linux_dmi = 0;
 193         osi_config.linux_cmdline = 1;
 194         __acpi_osi_setup_linux(enable);
 195 }
 196
 197 /*
 198  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 199  *
 200  * empty string disables _OSI
 201  * string starting with '!' disables that string
 202  * otherwise string is added to list, augmenting built-in strings
 203  */
 204 static void __init acpi_osi_setup_late(void)
 205 {
 206         struct acpi_osi_entry *osi;
 207         char *str;
 208         int i;
 209         acpi_status status;
 210
 211         if (osi_config.default_disabling) {
 212                 status = acpi_update_interfaces(osi_config.default_disabling);
 213                 if (ACPI_SUCCESS(status))
 214                         pr_info("Disabled all _OSI OS vendors%s\n",
 215                                 osi_config.default_disabling ==
 216                                 ACPI_DISABLE_ALL_STRINGS ?
 217                                 " and feature groups" : "");
 218         }
 219
 220         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
 221                 osi = &osi_setup_entries[i];
 222                 str = osi->string;
 223                 if (*str == '\0')
 224                         break;
 225                 if (osi->enable) {
 226                         status = acpi_install_interface(str);
 227                         if (ACPI_SUCCESS(status))
 228                                 pr_info("Added _OSI(%s)\n", str);
 229                 } else {
 230                         status = acpi_remove_interface(str);
 231                         if (ACPI_SUCCESS(status))
 232                                 pr_info("Deleted _OSI(%s)\n", str);
 233                 }
 234         }
 235 }
 236
 237 static int __init osi_setup(char *str)
 238 {
 239         if (str && !strcmp("Linux", str))
 240                 acpi_osi_setup_linux(true);
 241         else if (str && !strcmp("!Linux", str))
 242                 acpi_osi_setup_linux(false);
 243         else if (str && !strcmp("Darwin", str))
 244                 acpi_osi_setup_darwin(true);
 245         else if (str && !strcmp("!Darwin", str))
 246                 acpi_osi_setup_darwin(false);
 247         else
 248                 acpi_osi_setup(str);
 249
 250         return 1;
 251 }
 252 __setup("acpi_osi=", osi_setup);
 253
 254 bool acpi_osi_is_win8(void)
 255 {
 256         return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
 257 }
 258 EXPORT_SYMBOL(acpi_osi_is_win8);
 259
 260 static void __init acpi_osi_dmi_darwin(bool enable,
 261                                        const struct dmi_system_id *d)
 262 {
 263         pr_notice("DMI detected to setup _OSI(\"Darwin\"): %s\n", d->ident);
 264         osi_config.darwin_dmi = 1;
 265         __acpi_osi_setup_darwin(enable);
 266 }
 267
 268 void __init acpi_osi_dmi_linux(bool enable, const struct dmi_system_id *d)
 269 {
 270         pr_notice("DMI detected to setup _OSI(\"Linux\"): %s\n", d->ident);
 271         osi_config.linux_dmi = 1;
 272         __acpi_osi_setup_linux(enable);
 273 }
 274
 275 static int __init dmi_enable_osi_darwin(const struct dmi_system_id *d)
 276 {
 277         acpi_osi_dmi_darwin(true, d);
 278
 279         return 0;
 280 }
 281
 282 static int __init dmi_enable_osi_linux(const struct dmi_system_id *d)
 283 {
 284         acpi_osi_dmi_linux(true, d);
 285
 286         return 0;
 287 }
 288
 289 static int __init dmi_disable_osi_vista(const struct dmi_system_id *d)
 290 {
 291         pr_notice("DMI detected: %s\n", d->ident);
 292         acpi_osi_setup("!Windows 2006");
 293         acpi_osi_setup("!Windows 2006 SP1");
 294         acpi_osi_setup("!Windows 2006 SP2");
 295
 296         return 0;
 297 }
 298
 299 static int __init dmi_disable_osi_win7(const struct dmi_system_id *d)
 300 {
 301         pr_notice("DMI detected: %s\n", d->ident);
 302         acpi_osi_setup("!Windows 2009");
 303
 304         return 0;
 305 }
 306
 307 static int __init dmi_disable_osi_win8(const struct dmi_system_id *d)
 308 {
 309         pr_notice("DMI detected: %s\n", d->ident);
 310         acpi_osi_setup("!Windows 2012");
 311
 312         return 0;
 313 }
 314
 315 /*
 316  * Linux default _OSI response behavior is determined by this DMI table.
 317  *
 318  * Note that _OSI("Linux")/_OSI("Darwin") determined here can be overridden
 319  * by acpi_osi=!Linux/acpi_osi=!Darwin command line options.
 320  */
 321 static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
 322         {
 323         .callback = dmi_disable_osi_vista,
 324         .ident = "Fujitsu Siemens",
 325         .matches = {
 326                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 327                      DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile V5505"),
 328                 },
 329         },
 330         {
 331         /*
 332          * There have a NVIF method in MSI GX723 DSDT need call by Nvidia
 333          * driver (e.g. nouveau) when user press brightness hotkey.
 334          * Currently, nouveau driver didn't do the job and it causes there
 335          * have a infinite while loop in DSDT when user press hotkey.
 336          * We add MSI GX723's dmi information to this table for workaround
 337          * this issue.
 338          * Will remove MSI GX723 from the table after nouveau grows support.
 339          */
 340         .callback = dmi_disable_osi_vista,
 341         .ident = "MSI GX723",
 342         .matches = {
 343                      DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
 344                      DMI_MATCH(DMI_PRODUCT_NAME, "GX723"),
 345                 },
 346         },
 347         {
 348         .callback = dmi_disable_osi_vista,
 349         .ident = "Sony VGN-NS10J_S",
 350         .matches = {
 351                      DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 352                      DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS10J_S"),
 353                 },
 354         },
 355         {
 356         .callback = dmi_disable_osi_vista,
 357         .ident = "Sony VGN-SR290J",
 358         .matches = {
 359                      DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 360                      DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR290J"),
 361                 },
 362         },
 363         {
 364         .callback = dmi_disable_osi_vista,
 365         .ident = "VGN-NS50B_L",
 366         .matches = {
 367                      DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 368                      DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS50B_L"),
 369                 },
 370         },
 371         {
 372         .callback = dmi_disable_osi_vista,
 373         .ident = "VGN-SR19XN",
 374         .matches = {
 375                      DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 376                      DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR19XN"),
 377                 },
 378         },
 379         {
 380         .callback = dmi_disable_osi_vista,
 381         .ident = "Toshiba Satellite L355",
 382         .matches = {
 383                      DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 384                      DMI_MATCH(DMI_PRODUCT_VERSION, "Satellite L355"),
 385                 },
 386         },
 387         {
 388         .callback = dmi_disable_osi_win7,
 389         .ident = "ASUS K50IJ",
 390         .matches = {
 391                      DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 392                      DMI_MATCH(DMI_PRODUCT_NAME, "K50IJ"),
 393                 },
 394         },
 395         {
 396         .callback = dmi_disable_osi_vista,
 397         .ident = "Toshiba P305D",
 398         .matches = {
 399                      DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 400                      DMI_MATCH(DMI_PRODUCT_NAME, "Satellite P305D"),
 401                 },
 402         },
 403         {
 404         .callback = dmi_disable_osi_vista,
 405         .ident = "Toshiba NB100",
 406         .matches = {
 407                      DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 408                      DMI_MATCH(DMI_PRODUCT_NAME, "NB100"),
 409                 },
 410         },
 411
 412         /*
 413          * The wireless hotkey does not work on those machines when
 414          * returning true for _OSI("Windows 2012")
 415          */
 416         {
 417         .callback = dmi_disable_osi_win8,
 418         .ident = "Dell Inspiron 7737",
 419         .matches = {
 420                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 421                     DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7737"),
 422                 },
 423         },
 424         {
 425         .callback = dmi_disable_osi_win8,
 426         .ident = "Dell Inspiron 7537",
 427         .matches = {
 428                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 429                     DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7537"),
 430                 },
 431         },
 432         {
 433         .callback = dmi_disable_osi_win8,
 434         .ident = "Dell Inspiron 5437",
 435         .matches = {
 436                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 437                     DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5437"),
 438                 },
 439         },
 440         {
 441         .callback = dmi_disable_osi_win8,
 442         .ident = "Dell Inspiron 3437",
 443         .matches = {
 444                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 445                     DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 3437"),
 446                 },
 447         },
 448         {
 449         .callback = dmi_disable_osi_win8,
 450         .ident = "Dell Vostro 3446",
 451         .matches = {
 452                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 453                     DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3446"),
 454                 },
 455         },
 456         {
 457         .callback = dmi_disable_osi_win8,
 458         .ident = "Dell Vostro 3546",
 459         .matches = {
 460                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 461                     DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3546"),
 462                 },
 463         },
 464
 465         /*
 466          * BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
 467          * Linux ignores it, except for the machines enumerated below.
 468          */
 469
 470         /*
 471          * Without this this EEEpc exports a non working WMI interface, with
 472          * this it exports a working "good old" eeepc_laptop interface, fixing
 473          * both brightness control, and rfkill not working.
 474          */
 475         {
 476         .callback = dmi_enable_osi_linux,
 477         .ident = "Asus EEE PC 1015PX",
 478         .matches = {
 479                      DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 480                      DMI_MATCH(DMI_PRODUCT_NAME, "1015PX"),
 481                 },
 482         },
 483
 484         /*
 485          * Enable _OSI("Darwin") for all apple platforms.
 486          */
 487         {
 488         .callback = dmi_enable_osi_darwin,
 489         .ident = "Apple hardware",
 490         .matches = {
 491                      DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 492                 },
 493         },
 494         {
 495         .callback = dmi_enable_osi_darwin,
 496         .ident = "Apple hardware",
 497         .matches = {
 498                      DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
 499                 },
 500         },
 501         {}
 502 };
 503
 504 static __init void acpi_osi_dmi_blacklisted(void)
 505 {
 506         dmi_check_system(acpi_osi_dmi_table);
 507 }
 508
 509 int __init early_acpi_osi_init(void)
 510 {
 511         acpi_osi_dmi_blacklisted();
 512
 513         return 0;
 514 }
 515
 516 int __init acpi_osi_init(void)
 517 {
 518         acpi_install_interface_handler(acpi_osi_handler);
 519         acpi_osi_setup_late();
 520
 521         return 0;
 522 }