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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
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_entry
42osi_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 * Linux-Dell-Video is used by BIOS to disable RTD3 for NVidia graphics
49 * cards as RTD3 is not supported by drivers now. Systems with NVidia
50 * cards will hang without RTD3 disabled.
51 *
52 * Once NVidia drivers officially support RTD3, this _OSI strings can
53 * be removed if both new and old graphics cards are supported.
54 */
55 {"Linux-Dell-Video", true},
56 /*
57 * Linux-Lenovo-NV-HDMI-Audio is used by BIOS to power on NVidia's HDMI
58 * audio device which is turned off for power-saving in Windows OS.
59 * This power management feature observed on some Lenovo Thinkpad
60 * systems which will not be able to output audio via HDMI without
61 * a BIOS workaround.
62 */
63 {"Linux-Lenovo-NV-HDMI-Audio", true},
64 /*
65 * Linux-HPI-Hybrid-Graphics is used by BIOS to enable dGPU to
66 * output video directly to external monitors on HP Inc. mobile
67 * workstations as Nvidia and AMD VGA drivers provide limited
68 * hybrid graphics supports.
69 */
70 {"Linux-HPI-Hybrid-Graphics", true},
71};
72
73static u32 acpi_osi_handler(acpi_string interface, u32 supported)
74{
75 if (!strcmp("Linux", interface)) {
76 pr_notice_once(FW_BUG
77 "BIOS _OSI(Linux) query %s%s\n",
78 osi_config.linux_enable ? "honored" : "ignored",
79 osi_config.linux_cmdline ? " via cmdline" :
80 osi_config.linux_dmi ? " via DMI" : "");
81 }
82 if (!strcmp("Darwin", interface)) {
83 pr_notice_once(
84 "BIOS _OSI(Darwin) query %s%s\n",
85 osi_config.darwin_enable ? "honored" : "ignored",
86 osi_config.darwin_cmdline ? " via cmdline" :
87 osi_config.darwin_dmi ? " via DMI" : "");
88 }
89
90 return supported;
91}
92
93void __init acpi_osi_setup(char *str)
94{
95 struct acpi_osi_entry *osi;
96 bool enable = true;
97 int i;
98
99 if (!acpi_gbl_create_osi_method)
100 return;
101
102 if (str == NULL || *str == '\0') {
103 pr_info("_OSI method disabled\n");
104 acpi_gbl_create_osi_method = FALSE;
105 return;
106 }
107
108 if (*str == '!') {
109 str++;
110 if (*str == '\0') {
111 /* Do not override acpi_osi=!* */
112 if (!osi_config.default_disabling)
113 osi_config.default_disabling =
114 ACPI_DISABLE_ALL_VENDOR_STRINGS;
115 return;
116 } else if (*str == '*') {
117 osi_config.default_disabling = ACPI_DISABLE_ALL_STRINGS;
118 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
119 osi = &osi_setup_entries[i];
120 osi->enable = false;
121 }
122 return;
123 } else if (*str == '!') {
124 osi_config.default_disabling = 0;
125 return;
126 }
127 enable = false;
128 }
129
130 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
131 osi = &osi_setup_entries[i];
132 if (!strcmp(osi->string, str)) {
133 osi->enable = enable;
134 break;
135 } else if (osi->string[0] == '\0') {
136 osi->enable = enable;
137 strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
138 break;
139 }
140 }
141}
142
143static void __init __acpi_osi_setup_darwin(bool enable)
144{
145 osi_config.darwin_enable = !!enable;
146 if (enable) {
147 acpi_osi_setup("!");
148 acpi_osi_setup("Darwin");
149 } else {
150 acpi_osi_setup("!!");
151 acpi_osi_setup("!Darwin");
152 }
153}
154
155static void __init acpi_osi_setup_darwin(bool enable)
156{
157 /* Override acpi_osi_dmi_blacklisted() */
158 osi_config.darwin_dmi = 0;
159 osi_config.darwin_cmdline = 1;
160 __acpi_osi_setup_darwin(enable);
161}
162
163/*
164 * The story of _OSI(Linux)
165 *
166 * From pre-history through Linux-2.6.22, Linux responded TRUE upon a BIOS
167 * OSI(Linux) query.
168 *
169 * Unfortunately, reference BIOS writers got wind of this and put
170 * OSI(Linux) in their example code, quickly exposing this string as
171 * ill-conceived and opening the door to an un-bounded number of BIOS
172 * incompatibilities.
173 *
174 * For example, OSI(Linux) was used on resume to re-POST a video card on
175 * one system, because Linux at that time could not do a speedy restore in
176 * its native driver. But then upon gaining quick native restore
177 * capability, Linux has no way to tell the BIOS to skip the time-consuming
178 * POST -- putting Linux at a permanent performance disadvantage. On
179 * another system, the BIOS writer used OSI(Linux) to infer native OS
180 * support for IPMI! On other systems, OSI(Linux) simply got in the way of
181 * Linux claiming to be compatible with other operating systems, exposing
182 * BIOS issues such as skipped device initialization.
183 *
184 * So "Linux" turned out to be a really poor chose of OSI string, and from
185 * Linux-2.6.23 onward we respond FALSE.
186 *
187 * BIOS writers should NOT query _OSI(Linux) on future systems. Linux will
188 * complain on the console when it sees it, and return FALSE. To get Linux
189 * to return TRUE for your system will require a kernel source update to
190 * add a DMI entry, or boot with "acpi_osi=Linux"
191 */
192static void __init __acpi_osi_setup_linux(bool enable)
193{
194 osi_config.linux_enable = !!enable;
195 if (enable)
196 acpi_osi_setup("Linux");
197 else
198 acpi_osi_setup("!Linux");
199}
200
201static void __init acpi_osi_setup_linux(bool enable)
202{
203 /* Override acpi_osi_dmi_blacklisted() */
204 osi_config.linux_dmi = 0;
205 osi_config.linux_cmdline = 1;
206 __acpi_osi_setup_linux(enable);
207}
208
209/*
210 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
211 *
212 * empty string disables _OSI
213 * string starting with '!' disables that string
214 * otherwise string is added to list, augmenting built-in strings
215 */
216static void __init acpi_osi_setup_late(void)
217{
218 struct acpi_osi_entry *osi;
219 char *str;
220 int i;
221 acpi_status status;
222
223 if (osi_config.default_disabling) {
224 status = acpi_update_interfaces(osi_config.default_disabling);
225 if (ACPI_SUCCESS(status))
226 pr_info("Disabled all _OSI OS vendors%s\n",
227 osi_config.default_disabling ==
228 ACPI_DISABLE_ALL_STRINGS ?
229 " and feature groups" : "");
230 }
231
232 for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
233 osi = &osi_setup_entries[i];
234 str = osi->string;
235 if (*str == '\0')
236 break;
237 if (osi->enable) {
238 status = acpi_install_interface(str);
239 if (ACPI_SUCCESS(status))
240 pr_info("Added _OSI(%s)\n", str);
241 } else {
242 status = acpi_remove_interface(str);
243 if (ACPI_SUCCESS(status))
244 pr_info("Deleted _OSI(%s)\n", str);
245 }
246 }
247}
248
249static int __init osi_setup(char *str)
250{
251 if (str && !strcmp("Linux", str))
252 acpi_osi_setup_linux(true);
253 else if (str && !strcmp("!Linux", str))
254 acpi_osi_setup_linux(false);
255 else if (str && !strcmp("Darwin", str))
256 acpi_osi_setup_darwin(true);
257 else if (str && !strcmp("!Darwin", str))
258 acpi_osi_setup_darwin(false);
259 else
260 acpi_osi_setup(str);
261
262 return 1;
263}
264__setup("acpi_osi=", osi_setup);
265
266bool acpi_osi_is_win8(void)
267{
268 return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
269}
270EXPORT_SYMBOL(acpi_osi_is_win8);
271
272static void __init acpi_osi_dmi_darwin(void)
273{
274 pr_notice("DMI detected to setup _OSI(\"Darwin\"): Apple hardware\n");
275 osi_config.darwin_dmi = 1;
276 __acpi_osi_setup_darwin(true);
277}
278
279static void __init acpi_osi_dmi_linux(bool enable,
280 const struct dmi_system_id *d)
281{
282 pr_notice("DMI detected to setup _OSI(\"Linux\"): %s\n", d->ident);
283 osi_config.linux_dmi = 1;
284 __acpi_osi_setup_linux(enable);
285}
286
287static int __init dmi_enable_osi_linux(const struct dmi_system_id *d)
288{
289 acpi_osi_dmi_linux(true, d);
290
291 return 0;
292}
293
294static int __init dmi_disable_osi_vista(const struct dmi_system_id *d)
295{
296 pr_notice("DMI detected: %s\n", d->ident);
297 acpi_osi_setup("!Windows 2006");
298 acpi_osi_setup("!Windows 2006 SP1");
299 acpi_osi_setup("!Windows 2006 SP2");
300
301 return 0;
302}
303
304static int __init dmi_disable_osi_win7(const struct dmi_system_id *d)
305{
306 pr_notice("DMI detected: %s\n", d->ident);
307 acpi_osi_setup("!Windows 2009");
308
309 return 0;
310}
311
312static int __init dmi_disable_osi_win8(const struct dmi_system_id *d)
313{
314 pr_notice("DMI detected: %s\n", d->ident);
315 acpi_osi_setup("!Windows 2012");
316
317 return 0;
318}
319
320/*
321 * Linux default _OSI response behavior is determined by this DMI table.
322 *
323 * Note that _OSI("Linux")/_OSI("Darwin") determined here can be overridden
324 * by acpi_osi=!Linux/acpi_osi=!Darwin command line options.
325 */
326static const struct dmi_system_id acpi_osi_dmi_table[] __initconst = {
327 {
328 .callback = dmi_disable_osi_vista,
329 .ident = "Fujitsu Siemens",
330 .matches = {
331 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
332 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile V5505"),
333 },
334 },
335 {
336 /*
337 * There have a NVIF method in MSI GX723 DSDT need call by Nvidia
338 * driver (e.g. nouveau) when user press brightness hotkey.
339 * Currently, nouveau driver didn't do the job and it causes there
340 * have a infinite while loop in DSDT when user press hotkey.
341 * We add MSI GX723's dmi information to this table for workaround
342 * this issue.
343 * Will remove MSI GX723 from the table after nouveau grows support.
344 */
345 .callback = dmi_disable_osi_vista,
346 .ident = "MSI GX723",
347 .matches = {
348 DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
349 DMI_MATCH(DMI_PRODUCT_NAME, "GX723"),
350 },
351 },
352 {
353 .callback = dmi_disable_osi_vista,
354 .ident = "Sony VGN-NS10J_S",
355 .matches = {
356 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
357 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS10J_S"),
358 },
359 },
360 {
361 .callback = dmi_disable_osi_vista,
362 .ident = "Sony VGN-SR290J",
363 .matches = {
364 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
365 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR290J"),
366 },
367 },
368 {
369 .callback = dmi_disable_osi_vista,
370 .ident = "VGN-NS50B_L",
371 .matches = {
372 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
373 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS50B_L"),
374 },
375 },
376 {
377 .callback = dmi_disable_osi_vista,
378 .ident = "VGN-SR19XN",
379 .matches = {
380 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
381 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR19XN"),
382 },
383 },
384 {
385 .callback = dmi_disable_osi_vista,
386 .ident = "Toshiba Satellite L355",
387 .matches = {
388 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
389 DMI_MATCH(DMI_PRODUCT_VERSION, "Satellite L355"),
390 },
391 },
392 {
393 .callback = dmi_disable_osi_win7,
394 .ident = "ASUS K50IJ",
395 .matches = {
396 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
397 DMI_MATCH(DMI_PRODUCT_NAME, "K50IJ"),
398 },
399 },
400 {
401 .callback = dmi_disable_osi_vista,
402 .ident = "Toshiba P305D",
403 .matches = {
404 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
405 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite P305D"),
406 },
407 },
408 {
409 .callback = dmi_disable_osi_vista,
410 .ident = "Toshiba NB100",
411 .matches = {
412 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
413 DMI_MATCH(DMI_PRODUCT_NAME, "NB100"),
414 },
415 },
416
417 /*
418 * The wireless hotkey does not work on those machines when
419 * returning true for _OSI("Windows 2012")
420 */
421 {
422 .callback = dmi_disable_osi_win8,
423 .ident = "Dell Inspiron 7737",
424 .matches = {
425 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
426 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7737"),
427 },
428 },
429 {
430 .callback = dmi_disable_osi_win8,
431 .ident = "Dell Inspiron 7537",
432 .matches = {
433 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
434 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7537"),
435 },
436 },
437 {
438 .callback = dmi_disable_osi_win8,
439 .ident = "Dell Inspiron 5437",
440 .matches = {
441 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
442 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5437"),
443 },
444 },
445 {
446 .callback = dmi_disable_osi_win8,
447 .ident = "Dell Inspiron 3437",
448 .matches = {
449 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
450 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 3437"),
451 },
452 },
453 {
454 .callback = dmi_disable_osi_win8,
455 .ident = "Dell Vostro 3446",
456 .matches = {
457 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
458 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3446"),
459 },
460 },
461 {
462 .callback = dmi_disable_osi_win8,
463 .ident = "Dell Vostro 3546",
464 .matches = {
465 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
466 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3546"),
467 },
468 },
469
470 /*
471 * BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
472 * Linux ignores it, except for the machines enumerated below.
473 */
474
475 /*
476 * Without this this EEEpc exports a non working WMI interface, with
477 * this it exports a working "good old" eeepc_laptop interface, fixing
478 * both brightness control, and rfkill not working.
479 */
480 {
481 .callback = dmi_enable_osi_linux,
482 .ident = "Asus EEE PC 1015PX",
483 .matches = {
484 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
485 DMI_MATCH(DMI_PRODUCT_NAME, "1015PX"),
486 },
487 },
488 {}
489};
490
491static __init void acpi_osi_dmi_blacklisted(void)
492{
493 dmi_check_system(acpi_osi_dmi_table);
494
495 /* Enable _OSI("Darwin") for Apple platforms. */
496 if (x86_apple_machine)
497 acpi_osi_dmi_darwin();
498}
499
500int __init early_acpi_osi_init(void)
501{
502 acpi_osi_dmi_blacklisted();
503
504 return 0;
505}
506
507int __init acpi_osi_init(void)
508{
509 acpi_install_interface_handler(acpi_osi_handler);
510 acpi_osi_setup_late();
511
512 return 0;
513}