1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * osi.c - _OSI implementation
5 * Copyright (C) 2016 Intel Corporation
6 * Author: Lv Zheng <lv.zheng@intel.com>
9 /* Uncomment next line to get verbose printout */
11 #define pr_fmt(fmt) "ACPI: " fmt
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>
22 #define OSI_STRING_LENGTH_MAX 64
23 #define OSI_STRING_ENTRIES_MAX 16
25 struct acpi_osi_entry
{
26 char string
[OSI_STRING_LENGTH_MAX
];
30 static struct acpi_osi_config
{
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;
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},
49 static u32
acpi_osi_handler(acpi_string interface
, u32 supported
)
51 if (!strcmp("Linux", interface
)) {
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" : "");
58 if (!strcmp("Darwin", interface
)) {
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" : "");
69 void __init
acpi_osi_setup(char *str
)
71 struct acpi_osi_entry
*osi
;
75 if (!acpi_gbl_create_osi_method
)
78 if (str
== NULL
|| *str
== '\0') {
79 pr_info("_OSI method disabled\n");
80 acpi_gbl_create_osi_method
= FALSE
;
87 /* Do not override acpi_osi=!* */
88 if (!osi_config
.default_disabling
)
89 osi_config
.default_disabling
=
90 ACPI_DISABLE_ALL_VENDOR_STRINGS
;
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
];
99 } else if (*str
== '!') {
100 osi_config
.default_disabling
= 0;
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
;
111 } else if (osi
->string
[0] == '\0') {
112 osi
->enable
= enable
;
113 strscpy(osi
->string
, str
, OSI_STRING_LENGTH_MAX
);
119 static void __init
__acpi_osi_setup_darwin(bool enable
)
121 osi_config
.darwin_enable
= !!enable
;
124 acpi_osi_setup("Darwin");
126 acpi_osi_setup("!!");
127 acpi_osi_setup("!Darwin");
131 static void __init
acpi_osi_setup_darwin(bool enable
)
133 /* Override acpi_osi_dmi_blacklisted() */
134 osi_config
.darwin_dmi
= 0;
135 osi_config
.darwin_cmdline
= 1;
136 __acpi_osi_setup_darwin(enable
);
140 * The story of _OSI(Linux)
142 * From pre-history through Linux-2.6.22, Linux responded TRUE upon a BIOS
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
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.
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.
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"
168 static void __init
__acpi_osi_setup_linux(bool enable
)
170 osi_config
.linux_enable
= !!enable
;
172 acpi_osi_setup("Linux");
174 acpi_osi_setup("!Linux");
177 static void __init
acpi_osi_setup_linux(bool enable
)
179 /* Override acpi_osi_dmi_blacklisted() */
180 osi_config
.linux_dmi
= 0;
181 osi_config
.linux_cmdline
= 1;
182 __acpi_osi_setup_linux(enable
);
186 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
188 * empty string disables _OSI
189 * string starting with '!' disables that string
190 * otherwise string is added to list, augmenting built-in strings
192 static void __init
acpi_osi_setup_late(void)
194 struct acpi_osi_entry
*osi
;
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" : "");
208 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
209 osi
= &osi_setup_entries
[i
];
214 status
= acpi_install_interface(str
);
215 if (ACPI_SUCCESS(status
))
216 pr_info("Added _OSI(%s)\n", str
);
218 status
= acpi_remove_interface(str
);
219 if (ACPI_SUCCESS(status
))
220 pr_info("Deleted _OSI(%s)\n", str
);
225 static int __init
osi_setup(char *str
)
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);
240 __setup("acpi_osi=", osi_setup
);
242 bool acpi_osi_is_win8(void)
244 return acpi_gbl_osi_data
>= ACPI_OSI_WIN_8
;
246 EXPORT_SYMBOL(acpi_osi_is_win8
);
248 static void __init
acpi_osi_dmi_darwin(void)
250 pr_notice("DMI detected to setup _OSI(\"Darwin\"): Apple hardware\n");
251 osi_config
.darwin_dmi
= 1;
252 __acpi_osi_setup_darwin(true);
255 static void __init
acpi_osi_dmi_linux(bool enable
,
256 const struct dmi_system_id
*d
)
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
);
263 static int __init
dmi_enable_osi_linux(const struct dmi_system_id
*d
)
265 acpi_osi_dmi_linux(true, d
);
270 static int __init
dmi_disable_osi_vista(const struct dmi_system_id
*d
)
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");
280 static int __init
dmi_disable_osi_win7(const struct dmi_system_id
*d
)
282 pr_notice("DMI detected: %s\n", d
->ident
);
283 acpi_osi_setup("!Windows 2009");
288 static int __init
dmi_disable_osi_win8(const struct dmi_system_id
*d
)
290 pr_notice("DMI detected: %s\n", d
->ident
);
291 acpi_osi_setup("!Windows 2012");
297 * Linux default _OSI response behavior is determined by this DMI table.
299 * Note that _OSI("Linux")/_OSI("Darwin") determined here can be overridden
300 * by acpi_osi=!Linux/acpi_osi=!Darwin command line options.
302 static const struct dmi_system_id acpi_osi_dmi_table
[] __initconst
= {
304 .callback
= dmi_disable_osi_vista
,
305 .ident
= "Fujitsu Siemens",
307 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
308 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile V5505"),
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
319 * Will remove MSI GX723 from the table after nouveau grows support.
321 .callback
= dmi_disable_osi_vista
,
322 .ident
= "MSI GX723",
324 DMI_MATCH(DMI_SYS_VENDOR
, "Micro-Star International"),
325 DMI_MATCH(DMI_PRODUCT_NAME
, "GX723"),
329 .callback
= dmi_disable_osi_vista
,
330 .ident
= "Sony VGN-NS10J_S",
332 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
333 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NS10J_S"),
337 .callback
= dmi_disable_osi_vista
,
338 .ident
= "Sony VGN-SR290J",
340 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
341 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR290J"),
345 .callback
= dmi_disable_osi_vista
,
346 .ident
= "VGN-NS50B_L",
348 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
349 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NS50B_L"),
353 .callback
= dmi_disable_osi_vista
,
354 .ident
= "VGN-SR19XN",
356 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
357 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR19XN"),
361 .callback
= dmi_disable_osi_vista
,
362 .ident
= "Toshiba Satellite L355",
364 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
365 DMI_MATCH(DMI_PRODUCT_VERSION
, "Satellite L355"),
369 .callback
= dmi_disable_osi_win7
,
370 .ident
= "ASUS K50IJ",
372 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
373 DMI_MATCH(DMI_PRODUCT_NAME
, "K50IJ"),
377 .callback
= dmi_disable_osi_vista
,
378 .ident
= "Toshiba P305D",
380 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
381 DMI_MATCH(DMI_PRODUCT_NAME
, "Satellite P305D"),
385 .callback
= dmi_disable_osi_vista
,
386 .ident
= "Toshiba NB100",
388 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
389 DMI_MATCH(DMI_PRODUCT_NAME
, "NB100"),
394 * The wireless hotkey does not work on those machines when
395 * returning true for _OSI("Windows 2012")
398 .callback
= dmi_disable_osi_win8
,
399 .ident
= "Dell Inspiron 7737",
401 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
402 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron 7737"),
406 .callback
= dmi_disable_osi_win8
,
407 .ident
= "Dell Inspiron 7537",
409 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
410 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron 7537"),
414 .callback
= dmi_disable_osi_win8
,
415 .ident
= "Dell Inspiron 5437",
417 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
418 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron 5437"),
422 .callback
= dmi_disable_osi_win8
,
423 .ident
= "Dell Inspiron 3437",
425 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
426 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron 3437"),
430 .callback
= dmi_disable_osi_win8
,
431 .ident
= "Dell Vostro 3446",
433 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
434 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro 3446"),
438 .callback
= dmi_disable_osi_win8
,
439 .ident
= "Dell Vostro 3546",
441 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
442 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro 3546"),
447 * BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
448 * Linux ignores it, except for the machines enumerated below.
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.
457 .callback
= dmi_enable_osi_linux
,
458 .ident
= "Asus EEE PC 1015PX",
460 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer INC."),
461 DMI_MATCH(DMI_PRODUCT_NAME
, "1015PX"),
467 static __init
void acpi_osi_dmi_blacklisted(void)
469 dmi_check_system(acpi_osi_dmi_table
);
471 /* Enable _OSI("Darwin") for Apple platforms. */
472 if (x86_apple_machine
)
473 acpi_osi_dmi_darwin();
476 int __init
early_acpi_osi_init(void)
478 acpi_osi_dmi_blacklisted();
483 int __init
acpi_osi_init(void)
485 acpi_install_interface_handler(acpi_osi_handler
);
486 acpi_osi_setup_late();