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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: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown
parent
ae00d81243
commit
f507654d45
@ -33,6 +33,7 @@
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#include <linux/interrupt.h>
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#include <linux/kmod.h>
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#include <linux/delay.h>
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#include <linux/dmi.h>
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#include <linux/workqueue.h>
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#include <linux/nmi.h>
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#include <linux/acpi.h>
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@ -76,6 +77,18 @@ static struct workqueue_struct *kacpi_notify_wq;
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#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
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static char osi_additional_string[OSI_STRING_LENGTH_MAX];
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#define OSI_LINUX_ENABLED
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#ifdef OSI_LINUX_ENABLED
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int osi_linux = 1; /* enable _OSI(Linux) by default */
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#else
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int osi_linux; /* disable _OSI(Linux) by default */
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#endif
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#ifdef CONFIG_DMI
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static struct dmi_system_id acpi_osl_dmi_table[];
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#endif
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static void __init acpi_request_region (struct acpi_generic_address *addr,
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unsigned int length, char *desc)
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{
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@ -126,6 +139,7 @@ device_initcall(acpi_reserve_resources);
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acpi_status acpi_os_initialize(void)
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{
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dmi_check_system(acpi_osl_dmi_table);
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return AE_OK;
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}
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@ -963,6 +977,16 @@ static int __init acpi_os_name_setup(char *str)
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__setup("acpi_os_name=", acpi_os_name_setup);
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static void enable_osi_linux(int enable) {
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if (osi_linux != enable)
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printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n",
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enable ? "En": "Dis");
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osi_linux = enable;
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return;
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}
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/*
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* Modify the list of "OS Interfaces" reported to BIOS via _OSI
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*
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@ -978,6 +1002,10 @@ static int __init acpi_osi_setup(char *str)
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} else if (*str == '!') {
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if (acpi_osi_invalidate(++str) == AE_OK)
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printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
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} else if (!strcmp("!Linux", str)) {
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enable_osi_linux(0);
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} else if (!strcmp("Linux", str)) {
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enable_osi_linux(1);
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} else if (*osi_additional_string == '\0') {
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strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
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printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
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@ -1152,6 +1180,23 @@ acpi_os_validate_interface (char *interface)
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{
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if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
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return AE_OK;
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if (!strcmp("Linux", interface)) {
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printk(KERN_WARNING PREFIX
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"System BIOS is requesting _OSI(Linux)\n");
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#ifdef OSI_LINUX_ENABLED
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printk(KERN_WARNING PREFIX
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"Please test with \"acpi_osi=!Linux\"\n"
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"Please send dmidecode "
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"to linux-acpi@vger.kernel.org\n");
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#else
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printk(KERN_WARNING PREFIX
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"If \"acpi_osi=Linux\" works better,\n"
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"Please send dmidecode "
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"to linux-acpi@vger.kernel.org\n");
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#endif
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if(osi_linux)
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return AE_OK;
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}
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return AE_SUPPORT;
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}
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@ -1181,5 +1226,51 @@ acpi_os_validate_address (
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return AE_OK;
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}
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#ifdef CONFIG_DMI
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#ifdef OSI_LINUX_ENABLED
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static int dmi_osi_not_linux(struct dmi_system_id *d)
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{
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printk(KERN_NOTICE "%s detected: requires not _OSI(Linux)\n", d->ident);
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enable_osi_linux(0);
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return 0;
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}
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#else
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static int dmi_osi_linux(struct dmi_system_id *d)
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{
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printk(KERN_NOTICE "%s detected: requires _OSI(Linux)\n", d->ident);
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enable_osi_linux(1);
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return 0;
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}
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#endif
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static struct dmi_system_id acpi_osl_dmi_table[] = {
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#ifdef OSI_LINUX_ENABLED
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/*
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* Boxes that need NOT _OSI(Linux)
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*/
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{
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.callback = dmi_osi_not_linux,
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.ident = "Toshiba Satellite P100",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "TOSHIBA"),
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DMI_MATCH(DMI_BOARD_NAME, "Satellite P100"),
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},
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},
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#else
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/*
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* Boxes that need _OSI(Linux)
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*/
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{
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.callback = dmi_osi_linux,
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.ident = "Intel Napa CRB",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
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DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"),
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},
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},
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#endif
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{}
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};
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#endif /* CONFIG_DMI */
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#endif
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@ -62,7 +62,6 @@ acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc,
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static char *acpi_interfaces_supported[] = {
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/* Operating System Vendor Strings */
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"Linux",
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"Windows 2000",
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"Windows 2001",
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"Windows 2001 SP0",
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