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@@ -77,7 +77,55 @@ 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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-static int osi_linux; /* disable _OSI(Linux) by default */
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+/*
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+ * "Ode to _OSI(Linux)"
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+ *
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+ * osi_linux -- Control response to BIOS _OSI(Linux) query.
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+ *
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+ * As Linux evolves, the features that it supports change.
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+ * So an OSI string such as "Linux" is not specific enough
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+ * to be useful across multiple versions of Linux. It
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+ * doesn't identify any particular feature, interface,
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+ * or even any particular version of Linux...
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+ *
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+ * Unfortunately, Linux-2.6.22 and earlier responded "yes"
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+ * to a BIOS _OSI(Linux) query. When
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+ * a reference mobile BIOS started using it, its use
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+ * started to spread to many vendor platforms.
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+ * As it is not supportable, we need to halt that spread.
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+ *
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+ * Today, most BIOS references to _OSI(Linux) are noise --
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+ * they have no functional effect and are just dead code
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+ * carried over from the reference BIOS.
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+ *
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+ * The next most common case is that _OSI(Linux) harms Linux,
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+ * usually by causing the BIOS to follow paths that are
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+ * not tested during Windows validation.
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+ *
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+ * Finally, there is a short list of platforms
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+ * where OSI(Linux) benefits Linux.
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+ *
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+ * In Linux-2.6.23, OSI(Linux) is first disabled by default.
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+ * DMI is used to disable the dmesg warning about OSI(Linux)
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+ * on platforms where it is known to have no effect.
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+ * But a dmesg warning remains for systems where
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+ * we do not know if OSI(Linux) is good or bad for the system.
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+ * DMI is also used to enable OSI(Linux) for the machines
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+ * that are known to need it.
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+ *
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+ * BIOS writers should NOT query _OSI(Linux) on future systems.
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+ * It will be ignored by default, and to get Linux to
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+ * not ignore it will require a kernel source update to
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+ * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
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+ */
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+#define OSI_LINUX_ENABLE 0
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+
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+struct osi_linux {
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+ unsigned int enable:1;
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+ unsigned int dmi:1;
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+ unsigned int cmdline:1;
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+ unsigned int known:1;
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+} osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};
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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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@@ -959,13 +1007,37 @@ 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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+static void __init set_osi_linux(unsigned int enable)
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+{
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+ if (osi_linux.enable != enable) {
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+ osi_linux.enable = enable;
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+ printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
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+ enable ? "Add": "Delet");
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+ }
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+ return;
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+}
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+
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+static void __init acpi_cmdline_osi_linux(unsigned int enable)
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+{
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+ osi_linux.cmdline = 1; /* cmdline set the default */
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+ set_osi_linux(enable);
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+
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+ return;
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+}
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+
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+void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
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+{
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+ osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
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+
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+ printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
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+
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+ if (enable == -1)
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+ return;
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+
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+ osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */
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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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+ set_osi_linux(enable);
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- osi_linux = enable;
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return;
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}
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@@ -982,12 +1054,12 @@ static int __init acpi_osi_setup(char *str)
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printk(KERN_INFO PREFIX "_OSI method disabled\n");
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acpi_gbl_create_osi_method = FALSE;
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} else if (!strcmp("!Linux", str)) {
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- enable_osi_linux(0);
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+ acpi_cmdline_osi_linux(0); /* !enable */
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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(1);
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+ acpi_cmdline_osi_linux(1); /* enable */
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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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@@ -1183,19 +1255,29 @@ acpi_os_validate_interface (char *interface)
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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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- if (acpi_dmi_dump())
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- printk(KERN_NOTICE PREFIX
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- "[please extract dmidecode output]\n");
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- printk(KERN_NOTICE PREFIX
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- "Please send DMI info above to "
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- "linux-acpi@vger.kernel.org\n");
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+
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printk(KERN_NOTICE PREFIX
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- "If \"acpi_osi=%sLinux\" works better, "
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- "please notify linux-acpi@vger.kernel.org\n",
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- osi_linux ? "!" : "");
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- if(osi_linux)
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+ "BIOS _OSI(Linux) query %s%s\n",
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+ osi_linux.enable ? "honored" : "ignored",
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+ osi_linux.cmdline ? " via cmdline" :
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+ osi_linux.dmi ? " via DMI" : "");
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+
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+ if (!osi_linux.dmi) {
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+ if (acpi_dmi_dump())
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+ printk(KERN_NOTICE PREFIX
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+ "[please extract dmidecode output]\n");
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+ printk(KERN_NOTICE PREFIX
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+ "Please send DMI info above to "
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+ "linux-acpi@vger.kernel.org\n");
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+ }
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+ if (!osi_linux.known && !osi_linux.cmdline) {
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+ printk(KERN_NOTICE PREFIX
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+ "If \"acpi_osi=%sLinux\" works better, "
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+ "please notify linux-acpi@vger.kernel.org\n",
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+ osi_linux.enable ? "!" : "");
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+ }
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+
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+ if (osi_linux.enable)
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return AE_OK;
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}
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return AE_SUPPORT;
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Len Brown