Commit f507654d authored by Len Brown's avatar Len Brown
Browse files

ACPI: Make _OSI(Linux) a special case 

_OSI("Linux") is like _OS("Linux"), it is ill-defined and
virtually no BIOS vendors test interaction with it.
As a result, it can do more damage than good because
it causes the BIOS to follow un-tested paths.

Recently, several machines have turned up that erroneously
test this string in a way which causes them to _not_ test other
compatibility strings, including the ZI9 and Toshiba.
So it appears that this bad code has made it into
a BIOS vendor's reference BIOS.

Linux has no choice but to stop advertising compatibility
with _OSI string "Linux" - as there are an unbounded
number of possible incompatibilities going forward.

But some BIOSes have already shipped which do use it
for things like conditionally re-enabling video on resume
from S3.  (Too bad they didn't do that unconditionally)

Add special case code for _OSI(Linux)
Squawk to dmesg if _OSI(Linux) is requested
Add DMI list both to enable and disable _OSI(Linux)
But for now, keep the default enabled via
#define OSI_LINUX_ENABLED.

http://bugzilla.kernel.org/show_bug.cgi?id=7787



Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent ae00d812

drivers/acpi/osl.c

+91 −0
Original line number Original line Diff line number Diff line
@@ -33,6 +33,7 @@ 
#include <linux/interrupt.h>

#include <linux/interrupt.h>

#include <linux/kmod.h>

#include <linux/kmod.h>

#include <linux/delay.h>

#include <linux/delay.h>

#include <linux/dmi.h>

#include <linux/workqueue.h>

#include <linux/workqueue.h>

#include <linux/nmi.h>

#include <linux/nmi.h>

#include <linux/acpi.h>

#include <linux/acpi.h>
@@ -76,6 +77,18 @@ static struct workqueue_struct *kacpi_notify_wq; 
#define	OSI_STRING_LENGTH_MAX 64	/* arbitrary */

#define	OSI_STRING_LENGTH_MAX 64	/* arbitrary */

static char osi_additional_string[OSI_STRING_LENGTH_MAX];

static char osi_additional_string[OSI_STRING_LENGTH_MAX];





#define OSI_LINUX_ENABLED

#ifdef	OSI_LINUX_ENABLED

int osi_linux = 1;	/* enable _OSI(Linux) by default */

#else

int osi_linux;		/* disable _OSI(Linux) by default */

#endif





#ifdef CONFIG_DMI

static struct dmi_system_id acpi_osl_dmi_table[];

#endif



static void __init acpi_request_region (struct acpi_generic_address *addr,

static void __init acpi_request_region (struct acpi_generic_address *addr,

	unsigned int length, char *desc)

	unsigned int length, char *desc)

{

{
@@ -126,6 +139,7 @@ device_initcall(acpi_reserve_resources); 




acpi_status acpi_os_initialize(void)

acpi_status acpi_os_initialize(void)

{

{

	dmi_check_system(acpi_osl_dmi_table);

	return AE_OK;

	return AE_OK;

}

}
@@ -963,6 +977,16 @@ static int __init acpi_os_name_setup(char *str) 




__setup("acpi_os_name=", acpi_os_name_setup);

__setup("acpi_os_name=", acpi_os_name_setup);





static void enable_osi_linux(int enable) {



	if (osi_linux != enable)

		printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n",

			enable ? "En": "Dis");



	osi_linux = enable;

	return;

}



/*

/*

 * Modify the list of "OS Interfaces" reported to BIOS via _OSI

 * Modify the list of "OS Interfaces" reported to BIOS via _OSI

 *

 *
@@ -978,6 +1002,10 @@ static int __init acpi_osi_setup(char *str) 
	} else if (*str == '!') {

	} else if (*str == '!') {

		if (acpi_osi_invalidate(++str) == AE_OK)

		if (acpi_osi_invalidate(++str) == AE_OK)

			printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);

			printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);

	} else if (!strcmp("!Linux", str)) {

		enable_osi_linux(0);

	} else if (!strcmp("Linux", str)) {

		enable_osi_linux(1);

	} else if (*osi_additional_string == '\0') {

	} else if (*osi_additional_string == '\0') {

		strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);

		strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);

		printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);

		printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
@@ -1152,6 +1180,23 @@ acpi_os_validate_interface (char *interface) 
{

{

	if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))

	if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))

		return AE_OK;

		return AE_OK;

	if (!strcmp("Linux", interface)) {

		printk(KERN_WARNING PREFIX

			"System BIOS is requesting _OSI(Linux)\n");

#ifdef	OSI_LINUX_ENABLED

		printk(KERN_WARNING PREFIX

			"Please test with \"acpi_osi=!Linux\"\n"

			"Please send dmidecode "

			"to linux-acpi@vger.kernel.org\n");

#else

		printk(KERN_WARNING PREFIX

			"If \"acpi_osi=Linux\" works better,\n"

			"Please send dmidecode "

			"to linux-acpi@vger.kernel.org\n");

#endif

		if(osi_linux)

			return AE_OK;

	}

	return AE_SUPPORT;

	return AE_SUPPORT;

}

}
@@ -1181,5 +1226,51 @@ acpi_os_validate_address ( 
    return AE_OK;

    return AE_OK;

}

}





#ifdef CONFIG_DMI

#ifdef	OSI_LINUX_ENABLED

static int dmi_osi_not_linux(struct dmi_system_id *d)

{

	printk(KERN_NOTICE "%s detected: requires not _OSI(Linux)\n", d->ident);

	enable_osi_linux(0);

	return 0;

}

#else

static int dmi_osi_linux(struct dmi_system_id *d)

{

	printk(KERN_NOTICE "%s detected: requires _OSI(Linux)\n", d->ident);

	enable_osi_linux(1);

	return 0;

}

#endif



static struct dmi_system_id acpi_osl_dmi_table[] = {

#ifdef	OSI_LINUX_ENABLED

	/*

	 * Boxes that need NOT _OSI(Linux)

	 */

	{

	 .callback = dmi_osi_not_linux,

	 .ident = "Toshiba Satellite P100",

	 .matches = {

		     DMI_MATCH(DMI_BOARD_VENDOR, "TOSHIBA"),

		     DMI_MATCH(DMI_BOARD_NAME, "Satellite P100"),

		     },

	 },

#else

	/*

	 * Boxes that need _OSI(Linux)

	 */

	{

	 .callback = dmi_osi_linux,

	 .ident = "Intel Napa CRB",

	 .matches = {

		     DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),

		     DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"),

		     },

	 },

#endif

	{}

};

#endif /* CONFIG_DMI */





#endif
 
#endif

drivers/acpi/utilities/uteval.c

+0 −1
Original line number Original line Diff line number Diff line
@@ -62,7 +62,6 @@ acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc, 
static char *acpi_interfaces_supported[] = {

static char *acpi_interfaces_supported[] = {

	/* Operating System Vendor Strings */

	/* Operating System Vendor Strings */





	"Linux",

	"Windows 2000",

	"Windows 2000",

	"Windows 2001",

	"Windows 2001",

	"Windows 2001 SP0",

	"Windows 2001 SP0",

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