xref: /openbmc/linux/drivers/acpi/osi.c (revision e40573a4) 
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 	 * 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 
73 static 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 
93 void __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 
143 static 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 
155 static 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  */
192 static 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 
201 static 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  */
216 static 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 
249 static 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 
266 bool acpi_osi_is_win8(void)
267 {
268 	return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
269 }
270 EXPORT_SYMBOL(acpi_osi_is_win8);
271 
272 static 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 
279 static 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 
287 static 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 
294 static 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 
304 static 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 
312 static 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  */
326 static 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 EEEpc exports a non working WMI interface, with
477 	 * this it exports a working "good old" eeepc_laptop interface,
478 	 * fixing 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 
491 static __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 
500 int __init early_acpi_osi_init(void)
501 {
502 	acpi_osi_dmi_blacklisted();
503 
504 	return 0;
505 }
506 
507 int __init acpi_osi_init(void)
508 {
509 	acpi_install_interface_handler(acpi_osi_handler);
510 	acpi_osi_setup_late();
511 
512 	return 0;
513 }
514