drivers/acpi/osi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  osi.c - _OSI implementation
   4  *
   5  *  Copyright (C) 2016 Intel Corporation
   6  *    Author: Lv Zheng <lv.zheng@intel.com>
   7  */
   8
   9 /* Uncomment next line to get verbose printout */
  10 /* #define DEBUG */
  11 #define pr_fmt(fmt) "ACPI: " fmt
  12
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/acpi.h>
  16 #include <linux/dmi.h>
  17 #include <linux/platform_data/x86/apple.h>
  18
  19 #include "internal.h"
  20
  21
  22 #define OSI_STRING_LENGTH_MAX   64
  23 #define OSI_STRING_ENTRIES_MAX  16
  24
  25 struct acpi_osi_entry {
  26         char string[OSI_STRING_LENGTH_MAX];
  27         bool enable;
  28 };
  29
  30 static struct acpi_osi_config {
  31         u8              default_disabling;
  32         unsigned int    linux_enable:1;
  33         unsigned int    linux_dmi:1;
  34         unsigned int    linux_cmdline:1;
  35         unsigned int    darwin_enable:1;
  36         unsigned int    darwin_dmi:1;
  37         unsigned int    darwin_cmdline:1;
  38 } osi_config;
  39
  40 static struct acpi_osi_config osi_config;
  41 static struct acpi_osi_entry
  42 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
  43         {"Module Device", true},
  44         {"Processor Device", true},
  45         {"3.0 _SCP Extensions", true},
  46         {"Processor Aggregator Device", true},
  47 };
  48
  49 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
  50 {
  51         if (!strcmp("Linux", interface)) {
  52                 pr_notice_once(FW_BUG
  53                         "BIOS _OSI(Linux) query %s%s\n",
  54                         osi_config.linux_enable ? "honored" : "ignored",
  55                         osi_config.linux_cmdline ? " via cmdline" :
  56                         osi_config.linux_dmi ? " via DMI" : "");
  57         }
  58         if (!strcmp("Darwin", interface)) {
  59                 pr_notice_once(
  60                         "BIOS _OSI(Darwin) query %s%s\n",
  61                         osi_config.darwin_enable ? "honored" : "ignored",
  62                         osi_config.darwin_cmdline ? " via cmdline" :
  63                         osi_config.darwin_dmi ? " via DMI" : "");
  64         }
  65
  66         return supported;
  67 }
  68
  69 void __init acpi_osi_setup(char *str)
  70 {
  71         struct acpi_osi_entry *osi;
  72         bool enable = true;
  73         int i;
  74
  75         if (!acpi_gbl_create_osi_method)
  76                 return;
  77
  78         if (str == NULL || *str == '\0') {
  79                 pr_info("_OSI method disabled\n");
  80                 acpi_gbl_create_osi_method = FALSE;
  81                 return;
  82         }
  83
  84         if (*str == '!') {
  85                 str++;
  86                 if (*str == '\0') {
  87                         /* Do not override acpi_osi=!* */
  88                         if (!osi_config.default_disabling)
  89                                 osi_config.default_disabling =
  90                                         ACPI_DISABLE_ALL_VENDOR_STRINGS;
  91                         return;
  92                 } else if (*str == '*') {
  93                         osi_config.default_disabling = ACPI_DISABLE_ALL_STRINGS;
  94                         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
  95                                 osi = &osi_setup_entries[i];
  96                                 osi->enable = false;
  97                         }
  98                         return;
  99                 } else if (*str == '!') {
 100                         osi_config.default_disabling = 0;
 101                         return;
 102                 }
 103                 enable = false;
 104         }
 105
 106         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
 107                 osi = &osi_setup_entries[i];
 108                 if (!strcmp(osi->string, str)) {
 109                         osi->enable = enable;
 110                         break;
 111                 } else if (osi->string[0] == '\0') {
 112                         osi->enable = enable;
 113                         strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
 114                         break;
 115                 }
 116         }
 117 }
 118
 119 static void __init __acpi_osi_setup_darwin(bool enable)
 120 {
 121         osi_config.darwin_enable = !!enable;
 122         if (enable) {
 123                 acpi_osi_setup("!");
 124                 acpi_osi_setup("Darwin");
 125         } else {
 126                 acpi_osi_setup("!!");
 127                 acpi_osi_setup("!Darwin");
 128         }
 129 }
 130
 131 static void __init acpi_osi_setup_darwin(bool enable)
 132 {
 133         /* Override acpi_osi_dmi_blacklisted() */
 134         osi_config.darwin_dmi = 0;
 135         osi_config.darwin_cmdline = 1;
 136         __acpi_osi_setup_darwin(enable);
 137 }
 138
 139 /*
 140  * The story of _OSI(Linux)
 141  *
 142  * From pre-history through Linux-2.6.22, Linux responded TRUE upon a BIOS
 143  * OSI(Linux) query.
 144  *
 145  * Unfortunately, reference BIOS writers got wind of this and put
 146  * OSI(Linux) in their example code, quickly exposing this string as
 147  * ill-conceived and opening the door to an un-bounded number of BIOS
 148  * incompatibilities.
 149  *
 150  * For example, OSI(Linux) was used on resume to re-POST a video card on
 151  * one system, because Linux at that time could not do a speedy restore in
 152  * its native driver. But then upon gaining quick native restore
 153  * capability, Linux has no way to tell the BIOS to skip the time-consuming
 154  * POST -- putting Linux at a permanent performance disadvantage. On
 155  * another system, the BIOS writer used OSI(Linux) to infer native OS
 156  * support for IPMI!  On other systems, OSI(Linux) simply got in the way of
 157  * Linux claiming to be compatible with other operating systems, exposing
 158  * BIOS issues such as skipped device initialization.
 159  *
 160  * So "Linux" turned out to be a really poor chose of OSI string, and from
 161  * Linux-2.6.23 onward we respond FALSE.
 162  *
 163  * BIOS writers should NOT query _OSI(Linux) on future systems. Linux will
 164  * complain on the console when it sees it, and return FALSE. To get Linux
 165  * to return TRUE for your system  will require a kernel source update to
 166  * add a DMI entry, or boot with "acpi_osi=Linux"
 167  */
 168 static void __init __acpi_osi_setup_linux(bool enable)
 169 {
 170         osi_config.linux_enable = !!enable;
 171         if (enable)
 172                 acpi_osi_setup("Linux");
 173         else
 174                 acpi_osi_setup("!Linux");
 175 }
 176
 177 static void __init acpi_osi_setup_linux(bool enable)
 178 {
 179         /* Override acpi_osi_dmi_blacklisted() */
 180         osi_config.linux_dmi = 0;
 181         osi_config.linux_cmdline = 1;
 182         __acpi_osi_setup_linux(enable);
 183 }
 184
 185 /*
 186  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 187  *
 188  * empty string disables _OSI
 189  * string starting with '!' disables that string
 190  * otherwise string is added to list, augmenting built-in strings
 191  */
 192 static void __init acpi_osi_setup_late(void)
 193 {
 194         struct acpi_osi_entry *osi;
 195         char *str;
 196         int i;
 197         acpi_status status;
 198
 199         if (osi_config.default_disabling) {
 200                 status = acpi_update_interfaces(osi_config.default_disabling);
 201                 if (ACPI_SUCCESS(status))
 202                         pr_info("Disabled all _OSI OS vendors%s\n",
 203                                 osi_config.default_disabling ==
 204                                 ACPI_DISABLE_ALL_STRINGS ?
 205                                 " and feature groups" : "");
 206         }
 207
 208         for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
 209                 osi = &osi_setup_entries[i];
 210                 str = osi->string;
 211                 if (*str == '\0')
 212                         break;
 213                 if (osi->enable) {
 214                         status = acpi_install_interface(str);
 215                         if (ACPI_SUCCESS(status))
 216                                 pr_info("Added _OSI(%s)\n", str);
 217                 } else {
 218                         status = acpi_remove_interface(str);
 219                         if (ACPI_SUCCESS(status))
 220                                 pr_info("Deleted _OSI(%s)\n", str);
 221                 }
 222         }
 223 }
 224
 225 static int __init osi_setup(char *str)
 226 {
 227         if (str && !strcmp("Linux", str))
 228                 acpi_osi_setup_linux(true);
 229         else if (str && !strcmp("!Linux", str))
 230                 acpi_osi_setup_linux(false);
 231         else if (str && !strcmp("Darwin", str))
 232                 acpi_osi_setup_darwin(true);
 233         else if (str && !strcmp("!Darwin", str))
 234                 acpi_osi_setup_darwin(false);
 235         else
 236                 acpi_osi_setup(str);
 237
 238         return 1;
 239 }
 240 __setup("acpi_osi=", osi_setup);
 241
 242 bool acpi_osi_is_win8(void)
 243 {
 244         return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
 245 }
 246 EXPORT_SYMBOL(acpi_osi_is_win8);
 247
 248 static void __init acpi_osi_dmi_darwin(void)
 249 {
 250         pr_notice("DMI detected to setup _OSI(\"Darwin\"): Apple hardware\n");
 251         osi_config.darwin_dmi = 1;
 252         __acpi_osi_setup_darwin(true);
 253 }
 254
 255 static void __init acpi_osi_dmi_linux(bool enable,
 256                                       const struct dmi_system_id *d)
 257 {
 258         pr_notice("DMI detected to setup _OSI(\"Linux\"): %s\n", d->ident);
 259         osi_config.linux_dmi = 1;
 260         __acpi_osi_setup_linux(enable);
 261 }
 262
 263 static int __init dmi_enable_osi_linux(const struct dmi_system_id *d)
 264 {
 265         acpi_osi_dmi_linux(true, d);
 266
 267         return 0;
 268 }
 269
 270 static int __init dmi_disable_osi_vista(const struct dmi_system_id *d)
 271 {
 272         pr_notice("DMI detected: %s\n", d->ident);
 273         acpi_osi_setup("!Windows 2006");
 274         acpi_osi_setup("!Windows 2006 SP1");
 275         acpi_osi_setup("!Windows 2006 SP2");
 276
 277         return 0;
 278 }
 279
 280 static int __init dmi_disable_osi_win7(const struct dmi_system_id *d)
 281 {
 282         pr_notice("DMI detected: %s\n", d->ident);
 283         acpi_osi_setup("!Windows 2009");
 284
 285         return 0;
 286 }
 287
 288 static int __init dmi_disable_osi_win8(const struct dmi_system_id *d)
 289 {
 290         pr_notice("DMI detected: %s\n", d->ident);
 291         acpi_osi_setup("!Windows 2012");
 292
 293         return 0;
 294 }
 295
 296 /*
 297  * Linux default _OSI response behavior is determined by this DMI table.
 298  *
 299  * Note that _OSI("Linux")/_OSI("Darwin") determined here can be overridden
 300  * by acpi_osi=!Linux/acpi_osi=!Darwin command line options.
 301  */
 302 static const struct dmi_system_id acpi_osi_dmi_table[] __initconst = {
 303         {
 304         .callback = dmi_disable_osi_vista,
 305         .ident = "Fujitsu Siemens",
 306         .matches = {
 307                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 308                      DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile V5505"),
 309                 },
 310         },
 311         {
 312         /*
 313          * There have a NVIF method in MSI GX723 DSDT need call by Nvidia
 314          * driver (e.g. nouveau) when user press brightness hotkey.
 315          * Currently, nouveau driver didn't do the job and it causes there
 316          * have a infinite while loop in DSDT when user press hotkey.
 317          * We add MSI GX723's dmi information to this table for workaround
 318          * this issue.
 319          * Will remove MSI GX723 from the table after nouveau grows support.
 320          */
 321         .callback = dmi_disable_osi_vista,
 322         .ident = "MSI GX723",
 323         .matches = {
 324                      DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
 325                      DMI_MATCH(DMI_PRODUCT_NAME, "GX723"),
 326                 },
 327         },
 328         {
 329         .callback = dmi_disable_osi_vista,
 330         .ident = "Sony VGN-NS10J_S",
 331         .matches = {
 332                      DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 333                      DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS10J_S"),
 334                 },
 335         },
 336         {
 337         .callback = dmi_disable_osi_vista,
 338         .ident = "Sony VGN-SR290J",
 339         .matches = {
 340                      DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 341                      DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR290J"),
 342                 },
 343         },
 344         {
 345         .callback = dmi_disable_osi_vista,
 346         .ident = "VGN-NS50B_L",
 347         .matches = {
 348                      DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 349                      DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS50B_L"),
 350                 },
 351         },
 352         {
 353         .callback = dmi_disable_osi_vista,
 354         .ident = "VGN-SR19XN",
 355         .matches = {
 356                      DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 357                      DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR19XN"),
 358                 },
 359         },
 360         {
 361         .callback = dmi_disable_osi_vista,
 362         .ident = "Toshiba Satellite L355",
 363         .matches = {
 364                      DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 365                      DMI_MATCH(DMI_PRODUCT_VERSION, "Satellite L355"),
 366                 },
 367         },
 368         {
 369         .callback = dmi_disable_osi_win7,
 370         .ident = "ASUS K50IJ",
 371         .matches = {
 372                      DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 373                      DMI_MATCH(DMI_PRODUCT_NAME, "K50IJ"),
 374                 },
 375         },
 376         {
 377         .callback = dmi_disable_osi_vista,
 378         .ident = "Toshiba P305D",
 379         .matches = {
 380                      DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 381                      DMI_MATCH(DMI_PRODUCT_NAME, "Satellite P305D"),
 382                 },
 383         },
 384         {
 385         .callback = dmi_disable_osi_vista,
 386         .ident = "Toshiba NB100",
 387         .matches = {
 388                      DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 389                      DMI_MATCH(DMI_PRODUCT_NAME, "NB100"),
 390                 },
 391         },
 392
 393         /*
 394          * The wireless hotkey does not work on those machines when
 395          * returning true for _OSI("Windows 2012")
 396          */
 397         {
 398         .callback = dmi_disable_osi_win8,
 399         .ident = "Dell Inspiron 7737",
 400         .matches = {
 401                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 402                     DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7737"),
 403                 },
 404         },
 405         {
 406         .callback = dmi_disable_osi_win8,
 407         .ident = "Dell Inspiron 7537",
 408         .matches = {
 409                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 410                     DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7537"),
 411                 },
 412         },
 413         {
 414         .callback = dmi_disable_osi_win8,
 415         .ident = "Dell Inspiron 5437",
 416         .matches = {
 417                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 418                     DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5437"),
 419                 },
 420         },
 421         {
 422         .callback = dmi_disable_osi_win8,
 423         .ident = "Dell Inspiron 3437",
 424         .matches = {
 425                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 426                     DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 3437"),
 427                 },
 428         },
 429         {
 430         .callback = dmi_disable_osi_win8,
 431         .ident = "Dell Vostro 3446",
 432         .matches = {
 433                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 434                     DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3446"),
 435                 },
 436         },
 437         {
 438         .callback = dmi_disable_osi_win8,
 439         .ident = "Dell Vostro 3546",
 440         .matches = {
 441                     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 442                     DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3546"),
 443                 },
 444         },
 445
 446         /*
 447          * BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
 448          * Linux ignores it, except for the machines enumerated below.
 449          */
 450
 451         /*
 452          * Without this EEEpc exports a non working WMI interface, with
 453          * this it exports a working "good old" eeepc_laptop interface,
 454          * fixing both brightness control, and rfkill not working.
 455          */
 456         {
 457         .callback = dmi_enable_osi_linux,
 458         .ident = "Asus EEE PC 1015PX",
 459         .matches = {
 460                      DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
 461                      DMI_MATCH(DMI_PRODUCT_NAME, "1015PX"),
 462                 },
 463         },
 464         {}
 465 };
 466
 467 static __init void acpi_osi_dmi_blacklisted(void)
 468 {
 469         dmi_check_system(acpi_osi_dmi_table);
 470
 471         /* Enable _OSI("Darwin") for Apple platforms. */
 472         if (x86_apple_machine)
 473                 acpi_osi_dmi_darwin();
 474 }
 475
 476 int __init early_acpi_osi_init(void)
 477 {
 478         acpi_osi_dmi_blacklisted();
 479
 480         return 0;
 481 }
 482
 483 int __init acpi_osi_init(void)
 484 {
 485         acpi_install_interface_handler(acpi_osi_handler);
 486         acpi_osi_setup_late();
 487
 488         return 0;
 489 }