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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * osi.c - _OSI implementation4 *5 * Copyright (C) 2016 Intel Corporation6 * 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: " fmt12 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 6423#define OSI_STRING_ENTRIES_MAX 1624 25struct acpi_osi_entry {26 char string[OSI_STRING_LENGTH_MAX];27 bool enable;28};29 30static 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 40static struct acpi_osi_config osi_config;41static struct acpi_osi_entry42osi_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 49static u32 acpi_osi_handler(acpi_string interface, u32 supported)50{51 if (!strcmp("Linux", interface)) {52 pr_notice_once(FW_BUG53 "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 69void __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 strscpy(osi->string, str, OSI_STRING_LENGTH_MAX);114 break;115 }116 }117}118 119static 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 131static 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 BIOS143 * OSI(Linux) query.144 *145 * Unfortunately, reference BIOS writers got wind of this and put146 * OSI(Linux) in their example code, quickly exposing this string as147 * ill-conceived and opening the door to an un-bounded number of BIOS148 * incompatibilities.149 *150 * For example, OSI(Linux) was used on resume to re-POST a video card on151 * one system, because Linux at that time could not do a speedy restore in152 * its native driver. But then upon gaining quick native restore153 * capability, Linux has no way to tell the BIOS to skip the time-consuming154 * POST -- putting Linux at a permanent performance disadvantage. On155 * another system, the BIOS writer used OSI(Linux) to infer native OS156 * support for IPMI! On other systems, OSI(Linux) simply got in the way of157 * Linux claiming to be compatible with other operating systems, exposing158 * BIOS issues such as skipped device initialization.159 *160 * So "Linux" turned out to be a really poor chose of OSI string, and from161 * Linux-2.6.23 onward we respond FALSE.162 *163 * BIOS writers should NOT query _OSI(Linux) on future systems. Linux will164 * complain on the console when it sees it, and return FALSE. To get Linux165 * to return TRUE for your system will require a kernel source update to166 * add a DMI entry, or boot with "acpi_osi=Linux"167 */168static void __init __acpi_osi_setup_linux(bool enable)169{170 osi_config.linux_enable = !!enable;171 if (enable)172 acpi_osi_setup("Linux");173 else174 acpi_osi_setup("!Linux");175}176 177static 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 _OSI187 *188 * empty string disables _OSI189 * string starting with '!' disables that string190 * otherwise string is added to list, augmenting built-in strings191 */192static 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 225static 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 else236 acpi_osi_setup(str);237 238 return 1;239}240__setup("acpi_osi=", osi_setup);241 242bool acpi_osi_is_win8(void)243{244 return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;245}246EXPORT_SYMBOL(acpi_osi_is_win8);247 248static 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 255static 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 263static 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 270static 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 280static 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 288static 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 overridden300 * by acpi_osi=!Linux/acpi_osi=!Darwin command line options.301 */302static 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 Nvidia314 * driver (e.g. nouveau) when user press brightness hotkey.315 * Currently, nouveau driver didn't do the job and it causes there316 * have a infinite while loop in DSDT when user press hotkey.317 * We add MSI GX723's dmi information to this table for workaround318 * 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 when395 * 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, with453 * 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 467static __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 476int __init early_acpi_osi_init(void)477{478 acpi_osi_dmi_blacklisted();479 480 return 0;481}482 483int __init acpi_osi_init(void)484{485 acpi_install_interface_handler(acpi_osi_handler);486 acpi_osi_setup_late();487 488 return 0;489}490