linux-kernel - [PATCH] ACPI / processor: Make it possible to get local x2apic id via

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Message-Id: <1406604470-4800-1-git-send-email-hanjun.guo@linaro.org>
Date:	Tue, 29 Jul 2014 11:27:50 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Hanjun Guo <hanjun.guo@...aro.org>
Subject: [PATCH] ACPI / processor: Make it possible to get local x2apic id via _MAT

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@...aro.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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