[PATCH 07/10] xen/acpi: Prepare for cpu hotplug

[Liu Jinsong]

This patch rebased from Jeremy's pvops commit
68320323a51c2378aca433c76157d9e66104ff1e

It does some prepare work for cpu hotplug

Signed-off-by: Liu, Jinsong <jinsong.liu@xxxxxxxxx>
Signed-off-by: Jiang, Yunhong <yunhong.jiang@xxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 drivers/acpi/processor_xen.c |   37 +++++++++++++++++++++++++++++++++++++
 1 files changed, 37 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/processor_xen.c b/drivers/acpi/processor_xen.c
index 029e10c..38a1c05 100644
--- a/drivers/acpi/processor_xen.c
+++ b/drivers/acpi/processor_xen.c
@@ -19,6 +19,7 @@
 #include <acpi/acpi_drivers.h>
 #include <acpi/processor.h>
 #include <xen/acpi.h>
+#include <xen/pcpu.h>
=20
 #define PREFIX "ACPI: "
=20
@@ -54,6 +55,42 @@ struct acpi_driver xen_acpi_processor_driver =3D {
 		},
 };
=20
+static int is_processor_present(acpi_handle handle)
+{
+	acpi_status status;
+	unsigned long long sta =3D 0;
+
+
+	status =3D acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+
+	if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
+		return 1;
+
+	/*
+	 * _STA is mandatory for a processor that supports hot plug
+	 */
+	if (status =3D=3D AE_NOT_FOUND)
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				"Processor does not support hot plug\n"));
+	else
+		ACPI_EXCEPTION((AE_INFO, status,
+				"Processor Device is not present"));
+	return 0;
+}
+
+static acpi_status
+xen_acpi_processor_hotadd_init(struct acpi_processor *pr, int *p_cpu)
+{
+	if (!is_processor_present(pr->handle))
+		return AE_ERROR;
+
+	if (processor_cntl_xen_notify(pr,
+				PROCESSOR_HOTPLUG, HOTPLUG_TYPE_ADD))
+		return AE_ERROR;
+
+	return AE_OK;
+}
+
 #ifdef CONFIG_CPU_FREQ
 /*
  * Existing ACPI module does parse performance states at some point,
--=20
1.6.5.6

--_002_DE8DF0795D48FD4CA783C40EC8292335970BSHSMSX101ccrcorpint_
Content-Type: application/octet-stream;
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Content-Description: 0007-xen-acpi-Prepare-for-cpu-hotplug.patch
Content-Disposition: attachment;
	filename="0007-xen-acpi-Prepare-for-cpu-hotplug.patch"; size=1986;
	creation-date="Wed, 14 Dec 2011 15:20:15 GMT";
	modification-date="Wed, 14 Dec 2011 15:03:34 GMT"
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