xref: /openbmc/linux/drivers/acpi/osi.c (revision 070ed82e) 
1 /*
2  *  osi.c - _OSI implementation
3  *
4  *  Copyright (C) 2016 Intel Corporation
5  *    Author: Lv Zheng <lv.zheng@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
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.
13  *
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.
18  *
19  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20  */
21 
22 /* Uncomment next line to get verbose printout */
23 /* #define DEBUG */
24 #define pr_fmt(fmt) "ACPI: " fmt
25 
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/acpi.h>
29 #include <linux/dmi.h>
30 
31 #include "internal.h"
32 
33 
34 #define OSI_STRING_LENGTH_MAX	64
35 #define OSI_STRING_ENTRIES_MAX	16
36 
37 struct acpi_osi_entry {
38 	char string[OSI_STRING_LENGTH_MAX];
39 	bool enable;
40 };
41 
42 static struct acpi_osi_config {
43 	u8		default_disabling;
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;
50 } osi_config;
51 
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},
59 };
60 
61 static u32 acpi_osi_handler(acpi_string interface, u32 supported)
62 {
63 	if (!strcmp("Linux", interface)) {
64 		pr_notice_once(FW_BUG
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" : "");
69 	}
70 	if (!strcmp("Darwin", interface)) {
71 		pr_notice_once(
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" : "");
76 	}
77 
78 	return supported;
79 }
80 
81 void __init acpi_osi_setup(char *str)
82 {
83 	struct acpi_osi_entry *osi;
84 	bool enable = true;
85 	int i;
86 
87 	if (!acpi_gbl_create_osi_method)
88 		return;
89 
90 	if (str == NULL || *str == '\0') {
91 		pr_info("_OSI method disabled\n");
92 		acpi_gbl_create_osi_method = FALSE;
93 		return;
94 	}
95 
96 	if (*str == '!') {
97 		str++;
98 		if (*str == '\0') {
99 			/* Do not override acpi_osi=!* */
100 			if (!osi_config.default_disabling)
101 				osi_config.default_disabling =
102 					ACPI_DISABLE_ALL_VENDOR_STRINGS;
103 			return;
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];
108 				osi->enable = false;
109 			}
110 			return;
111 		} else if (*str == '!') {
112 			osi_config.default_disabling = 0;
113 			return;
114 		}
115 		enable = false;
116 	}
117 
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;
122 			break;
123 		} else if (osi->string[0] == '\0') {
124 			osi->enable = enable;
125 			strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
126 			break;
127 		}
128 	}
129 }
130 
131 static void __init __acpi_osi_setup_darwin(bool enable)
132 {
133 	osi_config.darwin_enable = !!enable;
134 	if (enable) {
135 		acpi_osi_setup("!");
136 		acpi_osi_setup("Darwin");
137 	} else {
138 		acpi_osi_setup("!!");
139 		acpi_osi_setup("!Darwin");
140 	}
141 }
142 
143 static void __init acpi_osi_setup_darwin(bool enable)
144 {
145 	/* Override acpi_osi_dmi_blacklisted() */
146 	osi_config.darwin_dmi = 0;
147 	osi_config.darwin_cmdline = 1;
148 	__acpi_osi_setup_darwin(enable);
149 }
150 
151 /*
152  * The story of _OSI(Linux)
153  *
154  * From pre-history through Linux-2.6.22, Linux responded TRUE upon a BIOS
155  * OSI(Linux) query.
156  *
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
160  * incompatibilities.
161  *
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.
171  *
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.
174  *
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"
179  */
180 static void __init __acpi_osi_setup_linux(bool enable)
181 {
182 	osi_config.linux_enable = !!enable;
183 	if (enable)
184 		acpi_osi_setup("Linux");
185 	else
186 		acpi_osi_setup("!Linux");
187 }
188 
189 static void __init acpi_osi_setup_linux(bool enable)
190 {
191 	/* Override acpi_osi_dmi_blacklisted() */
192 	osi_config.linux_dmi = 0;
193 	osi_config.linux_cmdline = 1;
194 	__acpi_osi_setup_linux(enable);
195 }
196 
197 /*
198  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
199  *
200  * empty string disables _OSI
201  * string starting with '!' disables that string
202  * otherwise string is added to list, augmenting built-in strings
203  */
204 static void __init acpi_osi_setup_late(void)
205 {
206 	struct acpi_osi_entry *osi;
207 	char *str;
208 	int i;
209 	acpi_status status;
210 
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" : "");
218 	}
219 
220 	for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
221 		osi = &osi_setup_entries[i];
222 		str = osi->string;
223 		if (*str == '\0')
224 			break;
225 		if (osi->enable) {
226 			status = acpi_install_interface(str);
227 			if (ACPI_SUCCESS(status))
228 				pr_info("Added _OSI(%s)\n", str);
229 		} else {
230 			status = acpi_remove_interface(str);
231 			if (ACPI_SUCCESS(status))
232 				pr_info("Deleted _OSI(%s)\n", str);
233 		}
234 	}
235 }
236 
237 static int __init osi_setup(char *str)
238 {
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);
247 	else
248 		acpi_osi_setup(str);
249 
250 	return 1;
251 }
252 __setup("acpi_osi=", osi_setup);
253 
254 bool acpi_osi_is_win8(void)
255 {
256 	return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
257 }
258 EXPORT_SYMBOL(acpi_osi_is_win8);
259 
260 static void __init acpi_osi_dmi_darwin(bool enable,
261 				       const struct dmi_system_id *d)
262 {
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);
266 }
267 
268 static void __init acpi_osi_dmi_linux(bool enable,
269 				      const struct dmi_system_id *d)
270 {
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);
274 }
275 
276 static int __init dmi_enable_osi_darwin(const struct dmi_system_id *d)
277 {
278 	acpi_osi_dmi_darwin(true, d);
279 
280 	return 0;
281 }
282 
283 static int __init dmi_enable_osi_linux(const struct dmi_system_id *d)
284 {
285 	acpi_osi_dmi_linux(true, d);
286 
287 	return 0;
288 }
289 
290 static int __init dmi_disable_osi_vista(const struct dmi_system_id *d)
291 {
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");
296 
297 	return 0;
298 }
299 
300 static int __init dmi_disable_osi_win7(const struct dmi_system_id *d)
301 {
302 	pr_notice("DMI detected: %s\n", d->ident);
303 	acpi_osi_setup("!Windows 2009");
304 
305 	return 0;
306 }
307 
308 static int __init dmi_disable_osi_win8(const struct dmi_system_id *d)
309 {
310 	pr_notice("DMI detected: %s\n", d->ident);
311 	acpi_osi_setup("!Windows 2012");
312 
313 	return 0;
314 }
315 
316 /*
317  * Linux default _OSI response behavior is determined by this DMI table.
318  *
319  * Note that _OSI("Linux")/_OSI("Darwin") determined here can be overridden
320  * by acpi_osi=!Linux/acpi_osi=!Darwin command line options.
321  */
322 static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
323 	{
324 	.callback = dmi_disable_osi_vista,
325 	.ident = "Fujitsu Siemens",
326 	.matches = {
327 		     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
328 		     DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile V5505"),
329 		},
330 	},
331 	{
332 	/*
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
338 	 * this issue.
339 	 * Will remove MSI GX723 from the table after nouveau grows support.
340 	 */
341 	.callback = dmi_disable_osi_vista,
342 	.ident = "MSI GX723",
343 	.matches = {
344 		     DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
345 		     DMI_MATCH(DMI_PRODUCT_NAME, "GX723"),
346 		},
347 	},
348 	{
349 	.callback = dmi_disable_osi_vista,
350 	.ident = "Sony VGN-NS10J_S",
351 	.matches = {
352 		     DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
353 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS10J_S"),
354 		},
355 	},
356 	{
357 	.callback = dmi_disable_osi_vista,
358 	.ident = "Sony VGN-SR290J",
359 	.matches = {
360 		     DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
361 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR290J"),
362 		},
363 	},
364 	{
365 	.callback = dmi_disable_osi_vista,
366 	.ident = "VGN-NS50B_L",
367 	.matches = {
368 		     DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
369 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS50B_L"),
370 		},
371 	},
372 	{
373 	.callback = dmi_disable_osi_vista,
374 	.ident = "VGN-SR19XN",
375 	.matches = {
376 		     DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
377 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR19XN"),
378 		},
379 	},
380 	{
381 	.callback = dmi_disable_osi_vista,
382 	.ident = "Toshiba Satellite L355",
383 	.matches = {
384 		     DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
385 		     DMI_MATCH(DMI_PRODUCT_VERSION, "Satellite L355"),
386 		},
387 	},
388 	{
389 	.callback = dmi_disable_osi_win7,
390 	.ident = "ASUS K50IJ",
391 	.matches = {
392 		     DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
393 		     DMI_MATCH(DMI_PRODUCT_NAME, "K50IJ"),
394 		},
395 	},
396 	{
397 	.callback = dmi_disable_osi_vista,
398 	.ident = "Toshiba P305D",
399 	.matches = {
400 		     DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
401 		     DMI_MATCH(DMI_PRODUCT_NAME, "Satellite P305D"),
402 		},
403 	},
404 	{
405 	.callback = dmi_disable_osi_vista,
406 	.ident = "Toshiba NB100",
407 	.matches = {
408 		     DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
409 		     DMI_MATCH(DMI_PRODUCT_NAME, "NB100"),
410 		},
411 	},
412 
413 	/*
414 	 * The wireless hotkey does not work on those machines when
415 	 * returning true for _OSI("Windows 2012")
416 	 */
417 	{
418 	.callback = dmi_disable_osi_win8,
419 	.ident = "Dell Inspiron 7737",
420 	.matches = {
421 		    DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
422 		    DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7737"),
423 		},
424 	},
425 	{
426 	.callback = dmi_disable_osi_win8,
427 	.ident = "Dell Inspiron 7537",
428 	.matches = {
429 		    DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
430 		    DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7537"),
431 		},
432 	},
433 	{
434 	.callback = dmi_disable_osi_win8,
435 	.ident = "Dell Inspiron 5437",
436 	.matches = {
437 		    DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
438 		    DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5437"),
439 		},
440 	},
441 	{
442 	.callback = dmi_disable_osi_win8,
443 	.ident = "Dell Inspiron 3437",
444 	.matches = {
445 		    DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
446 		    DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 3437"),
447 		},
448 	},
449 	{
450 	.callback = dmi_disable_osi_win8,
451 	.ident = "Dell Vostro 3446",
452 	.matches = {
453 		    DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
454 		    DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3446"),
455 		},
456 	},
457 	{
458 	.callback = dmi_disable_osi_win8,
459 	.ident = "Dell Vostro 3546",
460 	.matches = {
461 		    DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
462 		    DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3546"),
463 		},
464 	},
465 
466 	/*
467 	 * BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
468 	 * Linux ignores it, except for the machines enumerated below.
469 	 */
470 
471 	/*
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.
475 	 */
476 	{
477 	.callback = dmi_enable_osi_linux,
478 	.ident = "Asus EEE PC 1015PX",
479 	.matches = {
480 		     DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
481 		     DMI_MATCH(DMI_PRODUCT_NAME, "1015PX"),
482 		},
483 	},
484 
485 	/*
486 	 * Enable _OSI("Darwin") for all apple platforms.
487 	 */
488 	{
489 	.callback = dmi_enable_osi_darwin,
490 	.ident = "Apple hardware",
491 	.matches = {
492 		     DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
493 		},
494 	},
495 	{
496 	.callback = dmi_enable_osi_darwin,
497 	.ident = "Apple hardware",
498 	.matches = {
499 		     DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
500 		},
501 	},
502 	{}
503 };
504 
505 static __init void acpi_osi_dmi_blacklisted(void)
506 {
507 	dmi_check_system(acpi_osi_dmi_table);
508 }
509 
510 int __init early_acpi_osi_init(void)
511 {
512 	acpi_osi_dmi_blacklisted();
513 
514 	return 0;
515 }
516 
517 int __init acpi_osi_init(void)
518 {
519 	acpi_install_interface_handler(acpi_osi_handler);
520 	acpi_osi_setup_late();
521 
522 	return 0;
523 }
524