linux-kernel - [PATCH V1 1/3] Xen stub driver for CPU hotplug

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Date:	Tue, 15 Jan 2013 12:30:19 +0000
From:	"Liu, Jinsong" <jinsong.liu@...el.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Konrad Rzeszutek Wilk <konrad@...nel.org>
Subject: [PATCH V1 1/3] Xen stub driver for CPU hotplug

>From 110b4ef3b8ebefeaf68832dd8ef8aa916a782e89 Mon Sep 17 00:00:00 2001
From: Liu Jinsong <jinsong.liu@...el.com>
Date: Mon, 14 Jan 2013 15:19:30 +0800
Subject: [PATCH 1/3] Xen stub driver for CPU hotplug

Add Xen stub driver for CPU hotplug, early occupy to block native,
will be replaced later by real Xen processor driver module.

Signed-off-by: Liu Jinsong <jinsong.liu@...el.com>
---
 drivers/xen/xen-stub.c |   34 ++++++++++++++++++++++++++++++++--
 include/xen/acpi.h     |    6 ++++++
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/xen-stub.c b/drivers/xen/xen-stub.c
index 01a49e3..681e9cc 100644
--- a/drivers/xen/xen-stub.c
+++ b/drivers/xen/xen-stub.c
@@ -28,12 +28,13 @@
 #include <acpi/acpi_drivers.h>
 #include <xen/acpi.h>
 
+
+#ifdef CONFIG_ACPI
+
 /*--------------------------------------------
 	stub driver for Xen memory hotplug
 --------------------------------------------*/
 
-#ifdef CONFIG_ACPI
-
 static const struct acpi_device_id memory_device_ids[] = {
 	{ACPI_MEMORY_DEVICE_HID, 0},
 	{"", 0},
@@ -57,4 +58,33 @@ static int __init xen_stub_memory_device_init(void)
 }
 subsys_initcall(xen_stub_memory_device_init);
 
+
+/*--------------------------------------------
+	stub driver for Xen cpu hotplug
+--------------------------------------------*/
+
+static const struct acpi_device_id processor_device_ids[] = {
+	{ACPI_PROCESSOR_OBJECT_HID, 0},
+	{ACPI_PROCESSOR_DEVICE_HID, 0},
+	{"", 0},
+};
+
+struct acpi_driver xen_stub_processor_driver = {
+	/* same name as native processor driver to block native loaded */
+	.name = "processor",
+	.class = ACPI_PROCESSOR_CLASS,
+	.ids = processor_device_ids,
+};
+EXPORT_SYMBOL_GPL(xen_stub_processor_driver);
+
+static int __init xen_stub_processor_init(void)
+{
+	if (!xen_initial_domain())
+		return -ENODEV;
+
+	/* just reserve space for Xen, block native driver loaded */
+	return acpi_bus_register_driver(&xen_stub_processor_driver);
+}
+subsys_initcall(xen_stub_processor_init);
+
 #endif
diff --git a/include/xen/acpi.h b/include/xen/acpi.h
index 7366e58..1c99eb5 100644
--- a/include/xen/acpi.h
+++ b/include/xen/acpi.h
@@ -46,6 +46,12 @@
 
 extern struct acpi_driver xen_stub_memory_device_driver;
 
+#define ACPI_PROCESSOR_CLASS            "processor"
+#define ACPI_PROCESSOR_DEVICE_HID       "ACPI0007"
+#define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
+
+extern struct acpi_driver xen_stub_processor_driver;
+
 int xen_acpi_notify_hypervisor_state(u8 sleep_state,
 				     u32 pm1a_cnt, u32 pm1b_cnd);
 
-- 
1.7.1

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