xref: /linux/drivers/acpi/osi.c (revision c532de5a67a70f8533d495f8f2aaa9a0491c3ad0) 
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 
49 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
50 {
51 	if (!strcmp("Linux", interface)) {
52 		pr_notice_once(FW_BUG
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" : "");
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 
69 void __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 
119 static 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 
131 static 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 BIOS
143  * OSI(Linux) query.
144  *
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
148  * incompatibilities.
149  *
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.
159  *
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.
162  *
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"
167  */
168 static void __init __acpi_osi_setup_linux(bool enable)
169 {
170 	osi_config.linux_enable = !!enable;
171 	if (enable)
172 		acpi_osi_setup("Linux");
173 	else
174 		acpi_osi_setup("!Linux");
175 }
176 
177 static 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 _OSI
187  *
188  * empty string disables _OSI
189  * string starting with '!' disables that string
190  * otherwise string is added to list, augmenting built-in strings
191  */
192 static 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 
225 static 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 	else
236 		acpi_osi_setup(str);
237 
238 	return 1;
239 }
240 __setup("acpi_osi=", osi_setup);
241 
242 bool acpi_osi_is_win8(void)
243 {
244 	return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
245 }
246 EXPORT_SYMBOL(acpi_osi_is_win8);
247 
248 static 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 
255 static 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 
263 static 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 
270 static 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 
280 static 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 
288 static 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 overridden
300  * by acpi_osi=!Linux/acpi_osi=!Darwin command line options.
301  */
302 static 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 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
318 	 * 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 when
395 	 * 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, with
453 	 * 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 
467 static __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 
476 int __init early_acpi_osi_init(void)
477 {
478 	acpi_osi_dmi_blacklisted();
479 
480 	return 0;
481 }
482 
483 int __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