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

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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: Greg Pearson <greg.pearson@hp.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1335313436-32020-1-git-send-email-greg.pearson@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Greg Pearson 2012-04-24 18:23:56 -06:00 committed by Ingo Molnar
parent d0d3bc65af
commit ea0dcf903e
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kernel/apic/x2apic_phys.c
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@ -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;
} }