Commit ea0dcf90 authored by Greg Pearson's avatar Greg Pearson Committed by Ingo Molnar

x86/apic: Use x2apic physical mode based on FADT setting

Provide systems that do not support x2apic cluster mode
a mechanism to select x2apic physical mode using the
FADT FORCE_APIC_PHYSICAL_DESTINATION_MODE bit.

Changes from v1: (based on Suresh's comments)
 - removed #ifdef CONFIG_ACPI
 - removed #include <linux/acpi.h>
Signed-off-by: default avatarGreg Pearson <greg.pearson@hp.com>
Acked-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1335313436-32020-1-git-send-email-greg.pearson@hp.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent d0d3bc65
...@@ -24,6 +24,12 @@ static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id) ...@@ -24,6 +24,12 @@ static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{ {
if (x2apic_phys) if (x2apic_phys)
return x2apic_enabled(); return x2apic_enabled();
else if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL) &&
x2apic_enabled()) {
printk(KERN_DEBUG "System requires x2apic physical mode\n");
return 1;
}
else else
return 0; return 0;
} }
......
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