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Subject[PATCH] ACPI / processor: Make it possible to get local x2apic id via _MAT
Date
Logical processors with APIC ID values of 255 and greater are
required to have a Processor Device object and must convey the
processor's APIC information to OSPM using the Processor Local
X2APIC structure, but not until ACPI 5.1, X2APIC structure was
not supported in _MAT method.

_MAT is needed for CPU hotplug and system with more than 255
CPUs will definitely need X2APIC structure, so add its support
in map_mat_entry() to make it possible to get local x2apic id
via _MAT based on ACPI 5.1.

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
drivers/acpi/processor_core.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 00f48d1..e32321c 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -129,6 +129,8 @@ static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
map_lapic_id(header, acpi_id, &apic_id);
} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
map_lsapic_id(header, type, acpi_id, &apic_id);
+ } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
+ map_x2apic_id(header, type, acpi_id, &apic_id);
}

exit:
--
1.7.9.5


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