2 * osi.c - _OSI implementation
4 * Copyright (C) 2016 Intel Corporation
5 * Author: Lv Zheng <lv.zheng@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
22 /* Uncomment next line to get verbose printout */
24 #define pr_fmt(fmt) "ACPI: " fmt
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/acpi.h>
29 #include <linux/dmi.h>
34 #define OSI_STRING_LENGTH_MAX 64
35 #define OSI_STRING_ENTRIES_MAX 16
37 struct acpi_osi_entry
{
38 char string
[OSI_STRING_LENGTH_MAX
];
42 static struct acpi_osi_config
{
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;
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},
61 static u32
acpi_osi_handler(acpi_string interface
, u32 supported
)
63 if (!strcmp("Linux", interface
)) {
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" : "");
70 if (!strcmp("Darwin", interface
)) {
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" : "");
81 void __init
acpi_osi_setup(char *str
)
83 struct acpi_osi_entry
*osi
;
87 if (!acpi_gbl_create_osi_method
)
90 if (str
== NULL
|| *str
== '\0') {
91 pr_info("_OSI method disabled\n");
92 acpi_gbl_create_osi_method
= FALSE
;
99 /* Do not override acpi_osi=!* */
100 if (!osi_config
.default_disabling
)
101 osi_config
.default_disabling
=
102 ACPI_DISABLE_ALL_VENDOR_STRINGS
;
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
];
111 } else if (*str
== '!') {
112 osi_config
.default_disabling
= 0;
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
;
123 } else if (osi
->string
[0] == '\0') {
124 osi
->enable
= enable
;
125 strncpy(osi
->string
, str
, OSI_STRING_LENGTH_MAX
);
131 static void __init
__acpi_osi_setup_darwin(bool enable
)
133 osi_config
.darwin_enable
= !!enable
;
136 acpi_osi_setup("Darwin");
138 acpi_osi_setup("!!");
139 acpi_osi_setup("!Darwin");
143 static void __init
acpi_osi_setup_darwin(bool enable
)
145 /* Override acpi_osi_dmi_blacklisted() */
146 osi_config
.darwin_dmi
= 0;
147 osi_config
.darwin_cmdline
= 1;
148 __acpi_osi_setup_darwin(enable
);
152 * The story of _OSI(Linux)
154 * From pre-history through Linux-2.6.22, Linux responded TRUE upon a BIOS
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
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.
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.
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"
180 static void __init
__acpi_osi_setup_linux(bool enable
)
182 osi_config
.linux_enable
= !!enable
;
184 acpi_osi_setup("Linux");
186 acpi_osi_setup("!Linux");
189 static void __init
acpi_osi_setup_linux(bool enable
)
191 /* Override acpi_osi_dmi_blacklisted() */
192 osi_config
.linux_dmi
= 0;
193 osi_config
.linux_cmdline
= 1;
194 __acpi_osi_setup_linux(enable
);
198 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
200 * empty string disables _OSI
201 * string starting with '!' disables that string
202 * otherwise string is added to list, augmenting built-in strings
204 static void __init
acpi_osi_setup_late(void)
206 struct acpi_osi_entry
*osi
;
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" : "");
220 for (i
= 0; i
< OSI_STRING_ENTRIES_MAX
; i
++) {
221 osi
= &osi_setup_entries
[i
];
226 status
= acpi_install_interface(str
);
227 if (ACPI_SUCCESS(status
))
228 pr_info("Added _OSI(%s)\n", str
);
230 status
= acpi_remove_interface(str
);
231 if (ACPI_SUCCESS(status
))
232 pr_info("Deleted _OSI(%s)\n", str
);
237 static int __init
osi_setup(char *str
)
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);
252 __setup("acpi_osi=", osi_setup
);
254 bool acpi_osi_is_win8(void)
256 return acpi_gbl_osi_data
>= ACPI_OSI_WIN_8
;
258 EXPORT_SYMBOL(acpi_osi_is_win8
);
260 static void __init
acpi_osi_dmi_darwin(bool enable
,
261 const struct dmi_system_id
*d
)
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
);
268 static void __init
acpi_osi_dmi_linux(bool enable
,
269 const struct dmi_system_id
*d
)
271 pr_notice("DMI detected to setup _OSI(\"Linux\"): %s\n", d
->ident
);
272 osi_config
.linux_dmi
= 1;
273 __acpi_osi_setup_linux(enable
);
276 static int __init
dmi_enable_osi_darwin(const struct dmi_system_id
*d
)
278 acpi_osi_dmi_darwin(true, d
);
283 static int __init
dmi_enable_osi_linux(const struct dmi_system_id
*d
)
285 acpi_osi_dmi_linux(true, d
);
290 static int __init
dmi_disable_osi_vista(const struct dmi_system_id
*d
)
292 pr_notice("DMI detected: %s\n", d
->ident
);
293 acpi_osi_setup("!Windows 2006");
294 acpi_osi_setup("!Windows 2006 SP1");
295 acpi_osi_setup("!Windows 2006 SP2");
300 static int __init
dmi_disable_osi_win7(const struct dmi_system_id
*d
)
302 pr_notice("DMI detected: %s\n", d
->ident
);
303 acpi_osi_setup("!Windows 2009");
308 static int __init
dmi_disable_osi_win8(const struct dmi_system_id
*d
)
310 pr_notice("DMI detected: %s\n", d
->ident
);
311 acpi_osi_setup("!Windows 2012");
317 * Linux default _OSI response behavior is determined by this DMI table.
319 * Note that _OSI("Linux")/_OSI("Darwin") determined here can be overridden
320 * by acpi_osi=!Linux/acpi_osi=!Darwin command line options.
322 static struct dmi_system_id acpi_osi_dmi_table
[] __initdata
= {
324 .callback
= dmi_disable_osi_vista
,
325 .ident
= "Fujitsu Siemens",
327 DMI_MATCH(DMI_SYS_VENDOR
, "FUJITSU SIEMENS"),
328 DMI_MATCH(DMI_PRODUCT_NAME
, "ESPRIMO Mobile V5505"),
333 * There have a NVIF method in MSI GX723 DSDT need call by Nvidia
334 * driver (e.g. nouveau) when user press brightness hotkey.
335 * Currently, nouveau driver didn't do the job and it causes there
336 * have a infinite while loop in DSDT when user press hotkey.
337 * We add MSI GX723's dmi information to this table for workaround
339 * Will remove MSI GX723 from the table after nouveau grows support.
341 .callback
= dmi_disable_osi_vista
,
342 .ident
= "MSI GX723",
344 DMI_MATCH(DMI_SYS_VENDOR
, "Micro-Star International"),
345 DMI_MATCH(DMI_PRODUCT_NAME
, "GX723"),
349 .callback
= dmi_disable_osi_vista
,
350 .ident
= "Sony VGN-NS10J_S",
352 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
353 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NS10J_S"),
357 .callback
= dmi_disable_osi_vista
,
358 .ident
= "Sony VGN-SR290J",
360 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
361 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR290J"),
365 .callback
= dmi_disable_osi_vista
,
366 .ident
= "VGN-NS50B_L",
368 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
369 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NS50B_L"),
373 .callback
= dmi_disable_osi_vista
,
374 .ident
= "VGN-SR19XN",
376 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
377 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR19XN"),
381 .callback
= dmi_disable_osi_vista
,
382 .ident
= "Toshiba Satellite L355",
384 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
385 DMI_MATCH(DMI_PRODUCT_VERSION
, "Satellite L355"),
389 .callback
= dmi_disable_osi_win7
,
390 .ident
= "ASUS K50IJ",
392 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
393 DMI_MATCH(DMI_PRODUCT_NAME
, "K50IJ"),
397 .callback
= dmi_disable_osi_vista
,
398 .ident
= "Toshiba P305D",
400 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
401 DMI_MATCH(DMI_PRODUCT_NAME
, "Satellite P305D"),
405 .callback
= dmi_disable_osi_vista
,
406 .ident
= "Toshiba NB100",
408 DMI_MATCH(DMI_SYS_VENDOR
, "TOSHIBA"),
409 DMI_MATCH(DMI_PRODUCT_NAME
, "NB100"),
414 * The wireless hotkey does not work on those machines when
415 * returning true for _OSI("Windows 2012")
418 .callback
= dmi_disable_osi_win8
,
419 .ident
= "Dell Inspiron 7737",
421 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
422 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron 7737"),
426 .callback
= dmi_disable_osi_win8
,
427 .ident
= "Dell Inspiron 7537",
429 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
430 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron 7537"),
434 .callback
= dmi_disable_osi_win8
,
435 .ident
= "Dell Inspiron 5437",
437 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
438 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron 5437"),
442 .callback
= dmi_disable_osi_win8
,
443 .ident
= "Dell Inspiron 3437",
445 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
446 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron 3437"),
450 .callback
= dmi_disable_osi_win8
,
451 .ident
= "Dell Vostro 3446",
453 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
454 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro 3446"),
458 .callback
= dmi_disable_osi_win8
,
459 .ident
= "Dell Vostro 3546",
461 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
462 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro 3546"),
467 * BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
468 * Linux ignores it, except for the machines enumerated below.
472 * Without this this EEEpc exports a non working WMI interface, with
473 * this it exports a working "good old" eeepc_laptop interface, fixing
474 * both brightness control, and rfkill not working.
477 .callback
= dmi_enable_osi_linux
,
478 .ident
= "Asus EEE PC 1015PX",
480 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer INC."),
481 DMI_MATCH(DMI_PRODUCT_NAME
, "1015PX"),
486 * Enable _OSI("Darwin") for all apple platforms.
489 .callback
= dmi_enable_osi_darwin
,
490 .ident
= "Apple hardware",
492 DMI_MATCH(DMI_SYS_VENDOR
, "Apple Inc."),
496 .callback
= dmi_enable_osi_darwin
,
497 .ident
= "Apple hardware",
499 DMI_MATCH(DMI_SYS_VENDOR
, "Apple Computer, Inc."),
505 static __init
void acpi_osi_dmi_blacklisted(void)
507 dmi_check_system(acpi_osi_dmi_table
);
510 int __init
early_acpi_osi_init(void)
512 acpi_osi_dmi_blacklisted();
517 int __init
acpi_osi_init(void)
519 acpi_install_interface_handler(acpi_osi_handler
);
520 acpi_osi_setup_late();